1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Treepr
; -- ???For debugging code below
28 with Aspects
; use Aspects
;
29 with Atree
; use Atree
;
30 with Casing
; use Casing
;
31 with Checks
; use Checks
;
32 with Debug
; use Debug
;
33 with Elists
; use Elists
;
34 with Errout
; use Errout
;
35 with Erroutc
; use Erroutc
;
36 with Exp_Ch11
; use Exp_Ch11
;
37 with Exp_Disp
; use Exp_Disp
;
38 with Exp_Util
; use Exp_Util
;
39 with Fname
; use Fname
;
40 with Freeze
; use Freeze
;
42 with Lib
.Xref
; use Lib
.Xref
;
43 with Namet
.Sp
; use Namet
.Sp
;
44 with Nlists
; use Nlists
;
45 with Nmake
; use Nmake
;
46 with Output
; use Output
;
47 with Restrict
; use Restrict
;
48 with Rident
; use Rident
;
49 with Rtsfind
; use Rtsfind
;
51 with Sem_Aux
; use Sem_Aux
;
52 with Sem_Attr
; use Sem_Attr
;
53 with Sem_Ch6
; use Sem_Ch6
;
54 with Sem_Ch8
; use Sem_Ch8
;
55 with Sem_Disp
; use Sem_Disp
;
56 with Sem_Elab
; use Sem_Elab
;
57 with Sem_Eval
; use Sem_Eval
;
58 with Sem_Prag
; use Sem_Prag
;
59 with Sem_Res
; use Sem_Res
;
60 with Sem_Warn
; use Sem_Warn
;
61 with Sem_Type
; use Sem_Type
;
62 with Sinfo
; use Sinfo
;
63 with Sinput
; use Sinput
;
64 with Stand
; use Stand
;
66 with Stringt
; use Stringt
;
67 with Targparm
; use Targparm
;
68 with Tbuild
; use Tbuild
;
69 with Ttypes
; use Ttypes
;
70 with Uname
; use Uname
;
72 with GNAT
.HTable
; use GNAT
.HTable
;
74 package body Sem_Util
is
76 -----------------------
77 -- Local Subprograms --
78 -----------------------
80 function Build_Component_Subtype
83 T
: Entity_Id
) return Node_Id
;
84 -- This function builds the subtype for Build_Actual_Subtype_Of_Component
85 -- and Build_Discriminal_Subtype_Of_Component. C is a list of constraints,
86 -- Loc is the source location, T is the original subtype.
88 function Has_Enabled_Property
90 Property
: Name_Id
) return Boolean;
91 -- Subsidiary to routines Async_xxx_Enabled and Effective_xxx_Enabled.
92 -- Determine whether an abstract state or a variable denoted by entity
93 -- Item_Id has enabled property Property.
95 function Has_Null_Extension
(T
: Entity_Id
) return Boolean;
96 -- T is a derived tagged type. Check whether the type extension is null.
97 -- If the parent type is fully initialized, T can be treated as such.
99 function Is_Fully_Initialized_Variant
(Typ
: Entity_Id
) return Boolean;
100 -- Subsidiary to Is_Fully_Initialized_Type. For an unconstrained type
101 -- with discriminants whose default values are static, examine only the
102 -- components in the selected variant to determine whether all of them
105 type Null_Status_Kind
is
107 -- This value indicates that a subexpression is known to have a null
108 -- value at compile time.
111 -- This value indicates that a subexpression is known to have a non-null
112 -- value at compile time.
115 -- This value indicates that it cannot be determined at compile time
116 -- whether a subexpression yields a null or non-null value.
118 function Null_Status
(N
: Node_Id
) return Null_Status_Kind
;
119 -- Determine whether subexpression N of an access type yields a null value,
120 -- a non-null value, or the value cannot be determined at compile time. The
121 -- routine does not take simple flow diagnostics into account, it relies on
122 -- static facts such as the presence of null exclusions.
124 function Old_Requires_Transient_Scope
(Id
: Entity_Id
) return Boolean;
125 function New_Requires_Transient_Scope
(Id
: Entity_Id
) return Boolean;
126 -- ???We retain the old and new algorithms for Requires_Transient_Scope for
127 -- the time being. New_Requires_Transient_Scope is used by default; the
128 -- debug switch -gnatdQ can be used to do Old_Requires_Transient_Scope
129 -- instead. The intent is to use this temporarily to measure before/after
130 -- efficiency. Note: when this temporary code is removed, the documentation
131 -- of dQ in debug.adb should be removed.
133 procedure Results_Differ
137 -- ???Debugging code. Called when the Old_Val and New_Val differ. This
138 -- routine will be removed eventially when New_Requires_Transient_Scope
139 -- becomes Requires_Transient_Scope and Old_Requires_Transient_Scope is
142 function Subprogram_Name
(N
: Node_Id
) return String;
143 -- Return the fully qualified name of the enclosing subprogram for the
144 -- given node N, with file:line:col information appended, e.g.
145 -- "subp:file:line:col", corresponding to the source location of the
146 -- body of the subprogram.
148 ------------------------------
149 -- Abstract_Interface_List --
150 ------------------------------
152 function Abstract_Interface_List
(Typ
: Entity_Id
) return List_Id
is
156 if Is_Concurrent_Type
(Typ
) then
158 -- If we are dealing with a synchronized subtype, go to the base
159 -- type, whose declaration has the interface list.
161 -- Shouldn't this be Declaration_Node???
163 Nod
:= Parent
(Base_Type
(Typ
));
165 if Nkind
(Nod
) = N_Full_Type_Declaration
then
169 elsif Ekind
(Typ
) = E_Record_Type_With_Private
then
170 if Nkind
(Parent
(Typ
)) = N_Full_Type_Declaration
then
171 Nod
:= Type_Definition
(Parent
(Typ
));
173 elsif Nkind
(Parent
(Typ
)) = N_Private_Type_Declaration
then
174 if Present
(Full_View
(Typ
))
176 Nkind
(Parent
(Full_View
(Typ
))) = N_Full_Type_Declaration
178 Nod
:= Type_Definition
(Parent
(Full_View
(Typ
)));
180 -- If the full-view is not available we cannot do anything else
181 -- here (the source has errors).
187 -- Support for generic formals with interfaces is still missing ???
189 elsif Nkind
(Parent
(Typ
)) = N_Formal_Type_Declaration
then
194 (Nkind
(Parent
(Typ
)) = N_Private_Extension_Declaration
);
198 elsif Ekind
(Typ
) = E_Record_Subtype
then
199 Nod
:= Type_Definition
(Parent
(Etype
(Typ
)));
201 elsif Ekind
(Typ
) = E_Record_Subtype_With_Private
then
203 -- Recurse, because parent may still be a private extension. Also
204 -- note that the full view of the subtype or the full view of its
205 -- base type may (both) be unavailable.
207 return Abstract_Interface_List
(Etype
(Typ
));
209 elsif Ekind
(Typ
) = E_Record_Type
then
210 if Nkind
(Parent
(Typ
)) = N_Formal_Type_Declaration
then
211 Nod
:= Formal_Type_Definition
(Parent
(Typ
));
213 Nod
:= Type_Definition
(Parent
(Typ
));
216 -- Otherwise the type is of a kind which does not implement interfaces
222 return Interface_List
(Nod
);
223 end Abstract_Interface_List
;
225 --------------------------------
226 -- Add_Access_Type_To_Process --
227 --------------------------------
229 procedure Add_Access_Type_To_Process
(E
: Entity_Id
; A
: Entity_Id
) is
233 Ensure_Freeze_Node
(E
);
234 L
:= Access_Types_To_Process
(Freeze_Node
(E
));
238 Set_Access_Types_To_Process
(Freeze_Node
(E
), L
);
242 end Add_Access_Type_To_Process
;
244 --------------------------
245 -- Add_Block_Identifier --
246 --------------------------
248 procedure Add_Block_Identifier
(N
: Node_Id
; Id
: out Entity_Id
) is
249 Loc
: constant Source_Ptr
:= Sloc
(N
);
252 pragma Assert
(Nkind
(N
) = N_Block_Statement
);
254 -- The block already has a label, return its entity
256 if Present
(Identifier
(N
)) then
257 Id
:= Entity
(Identifier
(N
));
259 -- Create a new block label and set its attributes
262 Id
:= New_Internal_Entity
(E_Block
, Current_Scope
, Loc
, 'B');
263 Set_Etype
(Id
, Standard_Void_Type
);
266 Set_Identifier
(N
, New_Occurrence_Of
(Id
, Loc
));
267 Set_Block_Node
(Id
, Identifier
(N
));
269 end Add_Block_Identifier
;
271 ----------------------------
272 -- Add_Global_Declaration --
273 ----------------------------
275 procedure Add_Global_Declaration
(N
: Node_Id
) is
276 Aux_Node
: constant Node_Id
:= Aux_Decls_Node
(Cunit
(Current_Sem_Unit
));
279 if No
(Declarations
(Aux_Node
)) then
280 Set_Declarations
(Aux_Node
, New_List
);
283 Append_To
(Declarations
(Aux_Node
), N
);
285 end Add_Global_Declaration
;
287 --------------------------------
288 -- Address_Integer_Convert_OK --
289 --------------------------------
291 function Address_Integer_Convert_OK
(T1
, T2
: Entity_Id
) return Boolean is
293 if Allow_Integer_Address
294 and then ((Is_Descendant_Of_Address
(T1
)
295 and then Is_Private_Type
(T1
)
296 and then Is_Integer_Type
(T2
))
298 (Is_Descendant_Of_Address
(T2
)
299 and then Is_Private_Type
(T2
)
300 and then Is_Integer_Type
(T1
)))
306 end Address_Integer_Convert_OK
;
312 function Address_Value
(N
: Node_Id
) return Node_Id
is
317 -- For constant, get constant expression
319 if Is_Entity_Name
(Expr
)
320 and then Ekind
(Entity
(Expr
)) = E_Constant
322 Expr
:= Constant_Value
(Entity
(Expr
));
324 -- For unchecked conversion, get result to convert
326 elsif Nkind
(Expr
) = N_Unchecked_Type_Conversion
then
327 Expr
:= Expression
(Expr
);
329 -- For (common case) of To_Address call, get argument
331 elsif Nkind
(Expr
) = N_Function_Call
332 and then Is_Entity_Name
(Name
(Expr
))
333 and then Is_RTE
(Entity
(Name
(Expr
)), RE_To_Address
)
335 Expr
:= First
(Parameter_Associations
(Expr
));
337 if Nkind
(Expr
) = N_Parameter_Association
then
338 Expr
:= Explicit_Actual_Parameter
(Expr
);
341 -- We finally have the real expression
355 -- For now, just 8/16/32/64
357 function Addressable
(V
: Uint
) return Boolean is
359 return V
= Uint_8
or else
365 function Addressable
(V
: Int
) return Boolean is
373 ---------------------------------
374 -- Aggregate_Constraint_Checks --
375 ---------------------------------
377 procedure Aggregate_Constraint_Checks
379 Check_Typ
: Entity_Id
)
381 Exp_Typ
: constant Entity_Id
:= Etype
(Exp
);
384 if Raises_Constraint_Error
(Exp
) then
388 -- Ada 2005 (AI-230): Generate a conversion to an anonymous access
389 -- component's type to force the appropriate accessibility checks.
391 -- Ada 2005 (AI-231): Generate conversion to the null-excluding type to
392 -- force the corresponding run-time check
394 if Is_Access_Type
(Check_Typ
)
395 and then Is_Local_Anonymous_Access
(Check_Typ
)
397 Rewrite
(Exp
, Convert_To
(Check_Typ
, Relocate_Node
(Exp
)));
398 Analyze_And_Resolve
(Exp
, Check_Typ
);
399 Check_Unset_Reference
(Exp
);
402 -- What follows is really expansion activity, so check that expansion
403 -- is on and is allowed. In GNATprove mode, we also want check flags to
404 -- be added in the tree, so that the formal verification can rely on
405 -- those to be present. In GNATprove mode for formal verification, some
406 -- treatment typically only done during expansion needs to be performed
407 -- on the tree, but it should not be applied inside generics. Otherwise,
408 -- this breaks the name resolution mechanism for generic instances.
410 if not Expander_Active
411 and (Inside_A_Generic
or not Full_Analysis
or not GNATprove_Mode
)
416 if Is_Access_Type
(Check_Typ
)
417 and then Can_Never_Be_Null
(Check_Typ
)
418 and then not Can_Never_Be_Null
(Exp_Typ
)
420 Install_Null_Excluding_Check
(Exp
);
423 -- First check if we have to insert discriminant checks
425 if Has_Discriminants
(Exp_Typ
) then
426 Apply_Discriminant_Check
(Exp
, Check_Typ
);
428 -- Next emit length checks for array aggregates
430 elsif Is_Array_Type
(Exp_Typ
) then
431 Apply_Length_Check
(Exp
, Check_Typ
);
433 -- Finally emit scalar and string checks. If we are dealing with a
434 -- scalar literal we need to check by hand because the Etype of
435 -- literals is not necessarily correct.
437 elsif Is_Scalar_Type
(Exp_Typ
)
438 and then Compile_Time_Known_Value
(Exp
)
440 if Is_Out_Of_Range
(Exp
, Base_Type
(Check_Typ
)) then
441 Apply_Compile_Time_Constraint_Error
442 (Exp
, "value not in range of}??", CE_Range_Check_Failed
,
443 Ent
=> Base_Type
(Check_Typ
),
444 Typ
=> Base_Type
(Check_Typ
));
446 elsif Is_Out_Of_Range
(Exp
, Check_Typ
) then
447 Apply_Compile_Time_Constraint_Error
448 (Exp
, "value not in range of}??", CE_Range_Check_Failed
,
452 elsif not Range_Checks_Suppressed
(Check_Typ
) then
453 Apply_Scalar_Range_Check
(Exp
, Check_Typ
);
456 -- Verify that target type is also scalar, to prevent view anomalies
457 -- in instantiations.
459 elsif (Is_Scalar_Type
(Exp_Typ
)
460 or else Nkind
(Exp
) = N_String_Literal
)
461 and then Is_Scalar_Type
(Check_Typ
)
462 and then Exp_Typ
/= Check_Typ
464 if Is_Entity_Name
(Exp
)
465 and then Ekind
(Entity
(Exp
)) = E_Constant
467 -- If expression is a constant, it is worthwhile checking whether
468 -- it is a bound of the type.
470 if (Is_Entity_Name
(Type_Low_Bound
(Check_Typ
))
471 and then Entity
(Exp
) = Entity
(Type_Low_Bound
(Check_Typ
)))
473 (Is_Entity_Name
(Type_High_Bound
(Check_Typ
))
474 and then Entity
(Exp
) = Entity
(Type_High_Bound
(Check_Typ
)))
479 Rewrite
(Exp
, Convert_To
(Check_Typ
, Relocate_Node
(Exp
)));
480 Analyze_And_Resolve
(Exp
, Check_Typ
);
481 Check_Unset_Reference
(Exp
);
484 -- Could use a comment on this case ???
487 Rewrite
(Exp
, Convert_To
(Check_Typ
, Relocate_Node
(Exp
)));
488 Analyze_And_Resolve
(Exp
, Check_Typ
);
489 Check_Unset_Reference
(Exp
);
493 end Aggregate_Constraint_Checks
;
495 -----------------------
496 -- Alignment_In_Bits --
497 -----------------------
499 function Alignment_In_Bits
(E
: Entity_Id
) return Uint
is
501 return Alignment
(E
) * System_Storage_Unit
;
502 end Alignment_In_Bits
;
504 --------------------------------------
505 -- All_Composite_Constraints_Static --
506 --------------------------------------
508 function All_Composite_Constraints_Static
509 (Constr
: Node_Id
) return Boolean
512 if No
(Constr
) or else Error_Posted
(Constr
) then
516 case Nkind
(Constr
) is
518 if Nkind
(Constr
) in N_Has_Entity
519 and then Present
(Entity
(Constr
))
521 if Is_Type
(Entity
(Constr
)) then
523 not Is_Discrete_Type
(Entity
(Constr
))
524 or else Is_OK_Static_Subtype
(Entity
(Constr
));
527 elsif Nkind
(Constr
) = N_Range
then
529 Is_OK_Static_Expression
(Low_Bound
(Constr
))
531 Is_OK_Static_Expression
(High_Bound
(Constr
));
533 elsif Nkind
(Constr
) = N_Attribute_Reference
534 and then Attribute_Name
(Constr
) = Name_Range
537 Is_OK_Static_Expression
538 (Type_Low_Bound
(Etype
(Prefix
(Constr
))))
540 Is_OK_Static_Expression
541 (Type_High_Bound
(Etype
(Prefix
(Constr
))));
545 not Present
(Etype
(Constr
)) -- previous error
546 or else not Is_Discrete_Type
(Etype
(Constr
))
547 or else Is_OK_Static_Expression
(Constr
);
549 when N_Discriminant_Association
=>
550 return All_Composite_Constraints_Static
(Expression
(Constr
));
552 when N_Range_Constraint
=>
554 All_Composite_Constraints_Static
(Range_Expression
(Constr
));
556 when N_Index_Or_Discriminant_Constraint
=>
558 One_Cstr
: Entity_Id
;
560 One_Cstr
:= First
(Constraints
(Constr
));
561 while Present
(One_Cstr
) loop
562 if not All_Composite_Constraints_Static
(One_Cstr
) then
572 when N_Subtype_Indication
=>
574 All_Composite_Constraints_Static
(Subtype_Mark
(Constr
))
576 All_Composite_Constraints_Static
(Constraint
(Constr
));
581 end All_Composite_Constraints_Static
;
583 ------------------------
584 -- Append_Entity_Name --
585 ------------------------
587 procedure Append_Entity_Name
(Buf
: in out Bounded_String
; E
: Entity_Id
) is
588 Temp
: Bounded_String
;
590 procedure Inner
(E
: Entity_Id
);
591 -- Inner recursive routine, keep outer routine nonrecursive to ease
592 -- debugging when we get strange results from this routine.
598 procedure Inner
(E
: Entity_Id
) is
602 -- If entity has an internal name, skip by it, and print its scope.
603 -- Note that we strip a final R from the name before the test; this
604 -- is needed for some cases of instantiations.
607 E_Name
: Bounded_String
;
610 Append
(E_Name
, Chars
(E
));
612 if E_Name
.Chars
(E_Name
.Length
) = 'R' then
613 E_Name
.Length
:= E_Name
.Length
- 1;
616 if Is_Internal_Name
(E_Name
) then
624 -- Just print entity name if its scope is at the outer level
626 if Scop
= Standard_Standard
then
629 -- If scope comes from source, write scope and entity
631 elsif Comes_From_Source
(Scop
) then
632 Append_Entity_Name
(Temp
, Scop
);
635 -- If in wrapper package skip past it
637 elsif Present
(Scop
) and then Is_Wrapper_Package
(Scop
) then
638 Append_Entity_Name
(Temp
, Scope
(Scop
));
641 -- Otherwise nothing to output (happens in unnamed block statements)
650 E_Name
: Bounded_String
;
653 Append_Unqualified_Decoded
(E_Name
, Chars
(E
));
655 -- Remove trailing upper-case letters from the name (useful for
656 -- dealing with some cases of internal names generated in the case
657 -- of references from within a generic).
659 while E_Name
.Length
> 1
660 and then E_Name
.Chars
(E_Name
.Length
) in 'A' .. 'Z'
662 E_Name
.Length
:= E_Name
.Length
- 1;
665 -- Adjust casing appropriately (gets name from source if possible)
667 Adjust_Name_Case
(E_Name
, Sloc
(E
));
668 Append
(Temp
, E_Name
);
672 -- Start of processing for Append_Entity_Name
677 end Append_Entity_Name
;
679 ---------------------------------
680 -- Append_Inherited_Subprogram --
681 ---------------------------------
683 procedure Append_Inherited_Subprogram
(S
: Entity_Id
) is
684 Par
: constant Entity_Id
:= Alias
(S
);
685 -- The parent subprogram
687 Scop
: constant Entity_Id
:= Scope
(Par
);
688 -- The scope of definition of the parent subprogram
690 Typ
: constant Entity_Id
:= Defining_Entity
(Parent
(S
));
691 -- The derived type of which S is a primitive operation
697 if Ekind
(Current_Scope
) = E_Package
698 and then In_Private_Part
(Current_Scope
)
699 and then Has_Private_Declaration
(Typ
)
700 and then Is_Tagged_Type
(Typ
)
701 and then Scop
= Current_Scope
703 -- The inherited operation is available at the earliest place after
704 -- the derived type declaration ( RM 7.3.1 (6/1)). This is only
705 -- relevant for type extensions. If the parent operation appears
706 -- after the type extension, the operation is not visible.
709 (Visible_Declarations
710 (Package_Specification
(Current_Scope
)));
711 while Present
(Decl
) loop
712 if Nkind
(Decl
) = N_Private_Extension_Declaration
713 and then Defining_Entity
(Decl
) = Typ
715 if Sloc
(Decl
) > Sloc
(Par
) then
716 Next_E
:= Next_Entity
(Par
);
717 Set_Next_Entity
(Par
, S
);
718 Set_Next_Entity
(S
, Next_E
);
730 -- If partial view is not a type extension, or it appears before the
731 -- subprogram declaration, insert normally at end of entity list.
733 Append_Entity
(S
, Current_Scope
);
734 end Append_Inherited_Subprogram
;
736 -----------------------------------------
737 -- Apply_Compile_Time_Constraint_Error --
738 -----------------------------------------
740 procedure Apply_Compile_Time_Constraint_Error
743 Reason
: RT_Exception_Code
;
744 Ent
: Entity_Id
:= Empty
;
745 Typ
: Entity_Id
:= Empty
;
746 Loc
: Source_Ptr
:= No_Location
;
747 Rep
: Boolean := True;
748 Warn
: Boolean := False)
750 Stat
: constant Boolean := Is_Static_Expression
(N
);
751 R_Stat
: constant Node_Id
:=
752 Make_Raise_Constraint_Error
(Sloc
(N
), Reason
=> Reason
);
763 (Compile_Time_Constraint_Error
(N
, Msg
, Ent
, Loc
, Warn
=> Warn
));
765 -- In GNATprove mode, do not replace the node with an exception raised.
766 -- In such a case, either the call to Compile_Time_Constraint_Error
767 -- issues an error which stops analysis, or it issues a warning in
768 -- a few cases where a suitable check flag is set for GNATprove to
769 -- generate a check message.
771 if not Rep
or GNATprove_Mode
then
775 -- Now we replace the node by an N_Raise_Constraint_Error node
776 -- This does not need reanalyzing, so set it as analyzed now.
779 Set_Analyzed
(N
, True);
782 Set_Raises_Constraint_Error
(N
);
784 -- Now deal with possible local raise handling
786 Possible_Local_Raise
(N
, Standard_Constraint_Error
);
788 -- If the original expression was marked as static, the result is
789 -- still marked as static, but the Raises_Constraint_Error flag is
790 -- always set so that further static evaluation is not attempted.
793 Set_Is_Static_Expression
(N
);
795 end Apply_Compile_Time_Constraint_Error
;
797 ---------------------------
798 -- Async_Readers_Enabled --
799 ---------------------------
801 function Async_Readers_Enabled
(Id
: Entity_Id
) return Boolean is
803 return Has_Enabled_Property
(Id
, Name_Async_Readers
);
804 end Async_Readers_Enabled
;
806 ---------------------------
807 -- Async_Writers_Enabled --
808 ---------------------------
810 function Async_Writers_Enabled
(Id
: Entity_Id
) return Boolean is
812 return Has_Enabled_Property
(Id
, Name_Async_Writers
);
813 end Async_Writers_Enabled
;
815 --------------------------------------
816 -- Available_Full_View_Of_Component --
817 --------------------------------------
819 function Available_Full_View_Of_Component
(T
: Entity_Id
) return Boolean is
820 ST
: constant Entity_Id
:= Scope
(T
);
821 SCT
: constant Entity_Id
:= Scope
(Component_Type
(T
));
823 return In_Open_Scopes
(ST
)
824 and then In_Open_Scopes
(SCT
)
825 and then Scope_Depth
(ST
) >= Scope_Depth
(SCT
);
826 end Available_Full_View_Of_Component
;
832 procedure Bad_Attribute
835 Warn
: Boolean := False)
838 Error_Msg_Warn
:= Warn
;
839 Error_Msg_N
("unrecognized attribute&<<", N
);
841 -- Check for possible misspelling
843 Error_Msg_Name_1
:= First_Attribute_Name
;
844 while Error_Msg_Name_1
<= Last_Attribute_Name
loop
845 if Is_Bad_Spelling_Of
(Nam
, Error_Msg_Name_1
) then
846 Error_Msg_N
-- CODEFIX
847 ("\possible misspelling of %<<", N
);
851 Error_Msg_Name_1
:= Error_Msg_Name_1
+ 1;
855 --------------------------------
856 -- Bad_Predicated_Subtype_Use --
857 --------------------------------
859 procedure Bad_Predicated_Subtype_Use
863 Suggest_Static
: Boolean := False)
868 -- Avoid cascaded errors
870 if Error_Posted
(N
) then
874 if Inside_A_Generic
then
875 Gen
:= Current_Scope
;
876 while Present
(Gen
) and then Ekind
(Gen
) /= E_Generic_Package
loop
884 if Is_Generic_Formal
(Typ
) and then Is_Discrete_Type
(Typ
) then
885 Set_No_Predicate_On_Actual
(Typ
);
888 elsif Has_Predicates
(Typ
) then
889 if Is_Generic_Actual_Type
(Typ
) then
891 -- The restriction on loop parameters is only that the type
892 -- should have no dynamic predicates.
894 if Nkind
(Parent
(N
)) = N_Loop_Parameter_Specification
895 and then not Has_Dynamic_Predicate_Aspect
(Typ
)
896 and then Is_OK_Static_Subtype
(Typ
)
901 Gen
:= Current_Scope
;
902 while not Is_Generic_Instance
(Gen
) loop
906 pragma Assert
(Present
(Gen
));
908 if Ekind
(Gen
) = E_Package
and then In_Package_Body
(Gen
) then
909 Error_Msg_Warn
:= SPARK_Mode
/= On
;
910 Error_Msg_FE
(Msg
& "<<", N
, Typ
);
911 Error_Msg_F
("\Program_Error [<<", N
);
914 Make_Raise_Program_Error
(Sloc
(N
),
915 Reason
=> PE_Bad_Predicated_Generic_Type
));
918 Error_Msg_FE
(Msg
& "<<", N
, Typ
);
922 Error_Msg_FE
(Msg
, N
, Typ
);
925 -- Emit an optional suggestion on how to remedy the error if the
926 -- context warrants it.
928 if Suggest_Static
and then Has_Static_Predicate
(Typ
) then
929 Error_Msg_FE
("\predicate of & should be marked static", N
, Typ
);
932 end Bad_Predicated_Subtype_Use
;
934 -----------------------------------------
935 -- Bad_Unordered_Enumeration_Reference --
936 -----------------------------------------
938 function Bad_Unordered_Enumeration_Reference
940 T
: Entity_Id
) return Boolean
943 return Is_Enumeration_Type
(T
)
944 and then Warn_On_Unordered_Enumeration_Type
945 and then not Is_Generic_Type
(T
)
946 and then Comes_From_Source
(N
)
947 and then not Has_Pragma_Ordered
(T
)
948 and then not In_Same_Extended_Unit
(N
, T
);
949 end Bad_Unordered_Enumeration_Reference
;
951 ----------------------------
952 -- Begin_Keyword_Location --
953 ----------------------------
955 function Begin_Keyword_Location
(N
: Node_Id
) return Source_Ptr
is
959 pragma Assert
(Nkind_In
(N
, N_Block_Statement
,
965 HSS
:= Handled_Statement_Sequence
(N
);
967 -- When the handled sequence of statements comes from source, the
968 -- location of the "begin" keyword is that of the sequence itself.
969 -- Note that an internal construct may inherit a source sequence.
971 if Comes_From_Source
(HSS
) then
974 -- The parser generates an internal handled sequence of statements to
975 -- capture the location of the "begin" keyword if present in the source.
976 -- Since there are no source statements, the location of the "begin"
977 -- keyword is effectively that of the "end" keyword.
979 elsif Comes_From_Source
(N
) then
982 -- Otherwise the construct is internal and should carry the location of
983 -- the original construct which prompted its creation.
988 end Begin_Keyword_Location
;
990 --------------------------
991 -- Build_Actual_Subtype --
992 --------------------------
994 function Build_Actual_Subtype
996 N
: Node_Or_Entity_Id
) return Node_Id
999 -- Normally Sloc (N), but may point to corresponding body in some cases
1001 Constraints
: List_Id
;
1007 Disc_Type
: Entity_Id
;
1013 if Nkind
(N
) = N_Defining_Identifier
then
1014 Obj
:= New_Occurrence_Of
(N
, Loc
);
1016 -- If this is a formal parameter of a subprogram declaration, and
1017 -- we are compiling the body, we want the declaration for the
1018 -- actual subtype to carry the source position of the body, to
1019 -- prevent anomalies in gdb when stepping through the code.
1021 if Is_Formal
(N
) then
1023 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(N
));
1025 if Nkind
(Decl
) = N_Subprogram_Declaration
1026 and then Present
(Corresponding_Body
(Decl
))
1028 Loc
:= Sloc
(Corresponding_Body
(Decl
));
1037 if Is_Array_Type
(T
) then
1038 Constraints
:= New_List
;
1039 for J
in 1 .. Number_Dimensions
(T
) loop
1041 -- Build an array subtype declaration with the nominal subtype and
1042 -- the bounds of the actual. Add the declaration in front of the
1043 -- local declarations for the subprogram, for analysis before any
1044 -- reference to the formal in the body.
1047 Make_Attribute_Reference
(Loc
,
1049 Duplicate_Subexpr_No_Checks
(Obj
, Name_Req
=> True),
1050 Attribute_Name
=> Name_First
,
1051 Expressions
=> New_List
(
1052 Make_Integer_Literal
(Loc
, J
)));
1055 Make_Attribute_Reference
(Loc
,
1057 Duplicate_Subexpr_No_Checks
(Obj
, Name_Req
=> True),
1058 Attribute_Name
=> Name_Last
,
1059 Expressions
=> New_List
(
1060 Make_Integer_Literal
(Loc
, J
)));
1062 Append
(Make_Range
(Loc
, Lo
, Hi
), Constraints
);
1065 -- If the type has unknown discriminants there is no constrained
1066 -- subtype to build. This is never called for a formal or for a
1067 -- lhs, so returning the type is ok ???
1069 elsif Has_Unknown_Discriminants
(T
) then
1073 Constraints
:= New_List
;
1075 -- Type T is a generic derived type, inherit the discriminants from
1078 if Is_Private_Type
(T
)
1079 and then No
(Full_View
(T
))
1081 -- T was flagged as an error if it was declared as a formal
1082 -- derived type with known discriminants. In this case there
1083 -- is no need to look at the parent type since T already carries
1084 -- its own discriminants.
1086 and then not Error_Posted
(T
)
1088 Disc_Type
:= Etype
(Base_Type
(T
));
1093 Discr
:= First_Discriminant
(Disc_Type
);
1094 while Present
(Discr
) loop
1095 Append_To
(Constraints
,
1096 Make_Selected_Component
(Loc
,
1098 Duplicate_Subexpr_No_Checks
(Obj
),
1099 Selector_Name
=> New_Occurrence_Of
(Discr
, Loc
)));
1100 Next_Discriminant
(Discr
);
1104 Subt
:= Make_Temporary
(Loc
, 'S', Related_Node
=> N
);
1105 Set_Is_Internal
(Subt
);
1108 Make_Subtype_Declaration
(Loc
,
1109 Defining_Identifier
=> Subt
,
1110 Subtype_Indication
=>
1111 Make_Subtype_Indication
(Loc
,
1112 Subtype_Mark
=> New_Occurrence_Of
(T
, Loc
),
1114 Make_Index_Or_Discriminant_Constraint
(Loc
,
1115 Constraints
=> Constraints
)));
1117 Mark_Rewrite_Insertion
(Decl
);
1119 end Build_Actual_Subtype
;
1121 ---------------------------------------
1122 -- Build_Actual_Subtype_Of_Component --
1123 ---------------------------------------
1125 function Build_Actual_Subtype_Of_Component
1127 N
: Node_Id
) return Node_Id
1129 Loc
: constant Source_Ptr
:= Sloc
(N
);
1130 P
: constant Node_Id
:= Prefix
(N
);
1133 Index_Typ
: Entity_Id
;
1135 Desig_Typ
: Entity_Id
;
1136 -- This is either a copy of T, or if T is an access type, then it is
1137 -- the directly designated type of this access type.
1139 function Build_Actual_Array_Constraint
return List_Id
;
1140 -- If one or more of the bounds of the component depends on
1141 -- discriminants, build actual constraint using the discriminants
1144 function Build_Actual_Record_Constraint
return List_Id
;
1145 -- Similar to previous one, for discriminated components constrained
1146 -- by the discriminant of the enclosing object.
1148 -----------------------------------
1149 -- Build_Actual_Array_Constraint --
1150 -----------------------------------
1152 function Build_Actual_Array_Constraint
return List_Id
is
1153 Constraints
: constant List_Id
:= New_List
;
1161 Indx
:= First_Index
(Desig_Typ
);
1162 while Present
(Indx
) loop
1163 Old_Lo
:= Type_Low_Bound
(Etype
(Indx
));
1164 Old_Hi
:= Type_High_Bound
(Etype
(Indx
));
1166 if Denotes_Discriminant
(Old_Lo
) then
1168 Make_Selected_Component
(Loc
,
1169 Prefix
=> New_Copy_Tree
(P
),
1170 Selector_Name
=> New_Occurrence_Of
(Entity
(Old_Lo
), Loc
));
1173 Lo
:= New_Copy_Tree
(Old_Lo
);
1175 -- The new bound will be reanalyzed in the enclosing
1176 -- declaration. For literal bounds that come from a type
1177 -- declaration, the type of the context must be imposed, so
1178 -- insure that analysis will take place. For non-universal
1179 -- types this is not strictly necessary.
1181 Set_Analyzed
(Lo
, False);
1184 if Denotes_Discriminant
(Old_Hi
) then
1186 Make_Selected_Component
(Loc
,
1187 Prefix
=> New_Copy_Tree
(P
),
1188 Selector_Name
=> New_Occurrence_Of
(Entity
(Old_Hi
), Loc
));
1191 Hi
:= New_Copy_Tree
(Old_Hi
);
1192 Set_Analyzed
(Hi
, False);
1195 Append
(Make_Range
(Loc
, Lo
, Hi
), Constraints
);
1200 end Build_Actual_Array_Constraint
;
1202 ------------------------------------
1203 -- Build_Actual_Record_Constraint --
1204 ------------------------------------
1206 function Build_Actual_Record_Constraint
return List_Id
is
1207 Constraints
: constant List_Id
:= New_List
;
1212 D
:= First_Elmt
(Discriminant_Constraint
(Desig_Typ
));
1213 while Present
(D
) loop
1214 if Denotes_Discriminant
(Node
(D
)) then
1215 D_Val
:= Make_Selected_Component
(Loc
,
1216 Prefix
=> New_Copy_Tree
(P
),
1217 Selector_Name
=> New_Occurrence_Of
(Entity
(Node
(D
)), Loc
));
1220 D_Val
:= New_Copy_Tree
(Node
(D
));
1223 Append
(D_Val
, Constraints
);
1228 end Build_Actual_Record_Constraint
;
1230 -- Start of processing for Build_Actual_Subtype_Of_Component
1233 -- Why the test for Spec_Expression mode here???
1235 if In_Spec_Expression
then
1238 -- More comments for the rest of this body would be good ???
1240 elsif Nkind
(N
) = N_Explicit_Dereference
then
1241 if Is_Composite_Type
(T
)
1242 and then not Is_Constrained
(T
)
1243 and then not (Is_Class_Wide_Type
(T
)
1244 and then Is_Constrained
(Root_Type
(T
)))
1245 and then not Has_Unknown_Discriminants
(T
)
1247 -- If the type of the dereference is already constrained, it is an
1250 if Is_Array_Type
(Etype
(N
))
1251 and then Is_Constrained
(Etype
(N
))
1255 Remove_Side_Effects
(P
);
1256 return Build_Actual_Subtype
(T
, N
);
1263 if Ekind
(T
) = E_Access_Subtype
then
1264 Desig_Typ
:= Designated_Type
(T
);
1269 if Ekind
(Desig_Typ
) = E_Array_Subtype
then
1270 Id
:= First_Index
(Desig_Typ
);
1271 while Present
(Id
) loop
1272 Index_Typ
:= Underlying_Type
(Etype
(Id
));
1274 if Denotes_Discriminant
(Type_Low_Bound
(Index_Typ
))
1276 Denotes_Discriminant
(Type_High_Bound
(Index_Typ
))
1278 Remove_Side_Effects
(P
);
1280 Build_Component_Subtype
1281 (Build_Actual_Array_Constraint
, Loc
, Base_Type
(T
));
1287 elsif Is_Composite_Type
(Desig_Typ
)
1288 and then Has_Discriminants
(Desig_Typ
)
1289 and then not Has_Unknown_Discriminants
(Desig_Typ
)
1291 if Is_Private_Type
(Desig_Typ
)
1292 and then No
(Discriminant_Constraint
(Desig_Typ
))
1294 Desig_Typ
:= Full_View
(Desig_Typ
);
1297 D
:= First_Elmt
(Discriminant_Constraint
(Desig_Typ
));
1298 while Present
(D
) loop
1299 if Denotes_Discriminant
(Node
(D
)) then
1300 Remove_Side_Effects
(P
);
1302 Build_Component_Subtype
(
1303 Build_Actual_Record_Constraint
, Loc
, Base_Type
(T
));
1310 -- If none of the above, the actual and nominal subtypes are the same
1313 end Build_Actual_Subtype_Of_Component
;
1315 ---------------------------------
1316 -- Build_Class_Wide_Clone_Body --
1317 ---------------------------------
1319 procedure Build_Class_Wide_Clone_Body
1320 (Spec_Id
: Entity_Id
;
1323 Loc
: constant Source_Ptr
:= Sloc
(Bod
);
1324 Clone_Id
: constant Entity_Id
:= Class_Wide_Clone
(Spec_Id
);
1325 Clone_Body
: Node_Id
;
1328 -- The declaration of the class-wide clone was created when the
1329 -- corresponding class-wide condition was analyzed.
1332 Make_Subprogram_Body
(Loc
,
1334 Copy_Subprogram_Spec
(Parent
(Clone_Id
)),
1335 Declarations
=> Declarations
(Bod
),
1336 Handled_Statement_Sequence
=> Handled_Statement_Sequence
(Bod
));
1338 -- The new operation is internal and overriding indicators do not apply
1339 -- (the original primitive may have carried one).
1341 Set_Must_Override
(Specification
(Clone_Body
), False);
1342 Insert_Before
(Bod
, Clone_Body
);
1343 Analyze
(Clone_Body
);
1344 end Build_Class_Wide_Clone_Body
;
1346 ---------------------------------
1347 -- Build_Class_Wide_Clone_Call --
1348 ---------------------------------
1350 function Build_Class_Wide_Clone_Call
1353 Spec_Id
: Entity_Id
;
1354 Spec
: Node_Id
) return Node_Id
1356 Clone_Id
: constant Entity_Id
:= Class_Wide_Clone
(Spec_Id
);
1357 Par_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Spec_Id
);
1363 New_F_Spec
: Entity_Id
;
1364 New_Formal
: Entity_Id
;
1367 Actuals
:= Empty_List
;
1368 Formal
:= First_Formal
(Spec_Id
);
1369 New_F_Spec
:= First
(Parameter_Specifications
(Spec
));
1371 -- Build parameter association for call to class-wide clone.
1373 while Present
(Formal
) loop
1374 New_Formal
:= Defining_Identifier
(New_F_Spec
);
1376 -- If controlling argument and operation is inherited, add conversion
1377 -- to parent type for the call.
1379 if Etype
(Formal
) = Par_Type
1380 and then not Is_Empty_List
(Decls
)
1383 Make_Type_Conversion
(Loc
,
1384 New_Occurrence_Of
(Par_Type
, Loc
),
1385 New_Occurrence_Of
(New_Formal
, Loc
)));
1388 Append_To
(Actuals
, New_Occurrence_Of
(New_Formal
, Loc
));
1391 Next_Formal
(Formal
);
1395 if Ekind
(Spec_Id
) = E_Procedure
then
1397 Make_Procedure_Call_Statement
(Loc
,
1398 Name
=> New_Occurrence_Of
(Clone_Id
, Loc
),
1399 Parameter_Associations
=> Actuals
);
1402 Make_Simple_Return_Statement
(Loc
,
1404 Make_Function_Call
(Loc
,
1405 Name
=> New_Occurrence_Of
(Clone_Id
, Loc
),
1406 Parameter_Associations
=> Actuals
));
1410 Make_Subprogram_Body
(Loc
,
1412 Copy_Subprogram_Spec
(Spec
),
1413 Declarations
=> Decls
,
1414 Handled_Statement_Sequence
=>
1415 Make_Handled_Sequence_Of_Statements
(Loc
,
1416 Statements
=> New_List
(Call
),
1417 End_Label
=> Make_Identifier
(Loc
, Chars
(Spec_Id
))));
1420 end Build_Class_Wide_Clone_Call
;
1422 ---------------------------------
1423 -- Build_Class_Wide_Clone_Decl --
1424 ---------------------------------
1426 procedure Build_Class_Wide_Clone_Decl
(Spec_Id
: Entity_Id
) is
1427 Loc
: constant Source_Ptr
:= Sloc
(Spec_Id
);
1428 Clone_Id
: constant Entity_Id
:=
1429 Make_Defining_Identifier
(Loc
,
1430 New_External_Name
(Chars
(Spec_Id
), Suffix
=> "CL"));
1436 Spec
:= Copy_Subprogram_Spec
(Parent
(Spec_Id
));
1437 Set_Must_Override
(Spec
, False);
1438 Set_Must_Not_Override
(Spec
, False);
1439 Set_Defining_Unit_Name
(Spec
, Clone_Id
);
1441 Decl
:= Make_Subprogram_Declaration
(Loc
, Spec
);
1442 Append
(Decl
, List_Containing
(Unit_Declaration_Node
(Spec_Id
)));
1444 -- Link clone to original subprogram, for use when building body and
1445 -- wrapper call to inherited operation.
1447 Set_Class_Wide_Clone
(Spec_Id
, Clone_Id
);
1448 end Build_Class_Wide_Clone_Decl
;
1450 -----------------------------
1451 -- Build_Component_Subtype --
1452 -----------------------------
1454 function Build_Component_Subtype
1457 T
: Entity_Id
) return Node_Id
1463 -- Unchecked_Union components do not require component subtypes
1465 if Is_Unchecked_Union
(T
) then
1469 Subt
:= Make_Temporary
(Loc
, 'S');
1470 Set_Is_Internal
(Subt
);
1473 Make_Subtype_Declaration
(Loc
,
1474 Defining_Identifier
=> Subt
,
1475 Subtype_Indication
=>
1476 Make_Subtype_Indication
(Loc
,
1477 Subtype_Mark
=> New_Occurrence_Of
(Base_Type
(T
), Loc
),
1479 Make_Index_Or_Discriminant_Constraint
(Loc
,
1480 Constraints
=> C
)));
1482 Mark_Rewrite_Insertion
(Decl
);
1484 end Build_Component_Subtype
;
1486 ---------------------------
1487 -- Build_Default_Subtype --
1488 ---------------------------
1490 function Build_Default_Subtype
1492 N
: Node_Id
) return Entity_Id
1494 Loc
: constant Source_Ptr
:= Sloc
(N
);
1498 -- The base type that is to be constrained by the defaults
1501 if not Has_Discriminants
(T
) or else Is_Constrained
(T
) then
1505 Bas
:= Base_Type
(T
);
1507 -- If T is non-private but its base type is private, this is the
1508 -- completion of a subtype declaration whose parent type is private
1509 -- (see Complete_Private_Subtype in Sem_Ch3). The proper discriminants
1510 -- are to be found in the full view of the base. Check that the private
1511 -- status of T and its base differ.
1513 if Is_Private_Type
(Bas
)
1514 and then not Is_Private_Type
(T
)
1515 and then Present
(Full_View
(Bas
))
1517 Bas
:= Full_View
(Bas
);
1520 Disc
:= First_Discriminant
(T
);
1522 if No
(Discriminant_Default_Value
(Disc
)) then
1527 Act
: constant Entity_Id
:= Make_Temporary
(Loc
, 'S');
1528 Constraints
: constant List_Id
:= New_List
;
1532 while Present
(Disc
) loop
1533 Append_To
(Constraints
,
1534 New_Copy_Tree
(Discriminant_Default_Value
(Disc
)));
1535 Next_Discriminant
(Disc
);
1539 Make_Subtype_Declaration
(Loc
,
1540 Defining_Identifier
=> Act
,
1541 Subtype_Indication
=>
1542 Make_Subtype_Indication
(Loc
,
1543 Subtype_Mark
=> New_Occurrence_Of
(Bas
, Loc
),
1545 Make_Index_Or_Discriminant_Constraint
(Loc
,
1546 Constraints
=> Constraints
)));
1548 Insert_Action
(N
, Decl
);
1550 -- If the context is a component declaration the subtype declaration
1551 -- will be analyzed when the enclosing type is frozen, otherwise do
1554 if Ekind
(Current_Scope
) /= E_Record_Type
then
1560 end Build_Default_Subtype
;
1562 --------------------------------------------
1563 -- Build_Discriminal_Subtype_Of_Component --
1564 --------------------------------------------
1566 function Build_Discriminal_Subtype_Of_Component
1567 (T
: Entity_Id
) return Node_Id
1569 Loc
: constant Source_Ptr
:= Sloc
(T
);
1573 function Build_Discriminal_Array_Constraint
return List_Id
;
1574 -- If one or more of the bounds of the component depends on
1575 -- discriminants, build actual constraint using the discriminants
1578 function Build_Discriminal_Record_Constraint
return List_Id
;
1579 -- Similar to previous one, for discriminated components constrained by
1580 -- the discriminant of the enclosing object.
1582 ----------------------------------------
1583 -- Build_Discriminal_Array_Constraint --
1584 ----------------------------------------
1586 function Build_Discriminal_Array_Constraint
return List_Id
is
1587 Constraints
: constant List_Id
:= New_List
;
1595 Indx
:= First_Index
(T
);
1596 while Present
(Indx
) loop
1597 Old_Lo
:= Type_Low_Bound
(Etype
(Indx
));
1598 Old_Hi
:= Type_High_Bound
(Etype
(Indx
));
1600 if Denotes_Discriminant
(Old_Lo
) then
1601 Lo
:= New_Occurrence_Of
(Discriminal
(Entity
(Old_Lo
)), Loc
);
1604 Lo
:= New_Copy_Tree
(Old_Lo
);
1607 if Denotes_Discriminant
(Old_Hi
) then
1608 Hi
:= New_Occurrence_Of
(Discriminal
(Entity
(Old_Hi
)), Loc
);
1611 Hi
:= New_Copy_Tree
(Old_Hi
);
1614 Append
(Make_Range
(Loc
, Lo
, Hi
), Constraints
);
1619 end Build_Discriminal_Array_Constraint
;
1621 -----------------------------------------
1622 -- Build_Discriminal_Record_Constraint --
1623 -----------------------------------------
1625 function Build_Discriminal_Record_Constraint
return List_Id
is
1626 Constraints
: constant List_Id
:= New_List
;
1631 D
:= First_Elmt
(Discriminant_Constraint
(T
));
1632 while Present
(D
) loop
1633 if Denotes_Discriminant
(Node
(D
)) then
1635 New_Occurrence_Of
(Discriminal
(Entity
(Node
(D
))), Loc
);
1637 D_Val
:= New_Copy_Tree
(Node
(D
));
1640 Append
(D_Val
, Constraints
);
1645 end Build_Discriminal_Record_Constraint
;
1647 -- Start of processing for Build_Discriminal_Subtype_Of_Component
1650 if Ekind
(T
) = E_Array_Subtype
then
1651 Id
:= First_Index
(T
);
1652 while Present
(Id
) loop
1653 if Denotes_Discriminant
(Type_Low_Bound
(Etype
(Id
)))
1655 Denotes_Discriminant
(Type_High_Bound
(Etype
(Id
)))
1657 return Build_Component_Subtype
1658 (Build_Discriminal_Array_Constraint
, Loc
, T
);
1664 elsif Ekind
(T
) = E_Record_Subtype
1665 and then Has_Discriminants
(T
)
1666 and then not Has_Unknown_Discriminants
(T
)
1668 D
:= First_Elmt
(Discriminant_Constraint
(T
));
1669 while Present
(D
) loop
1670 if Denotes_Discriminant
(Node
(D
)) then
1671 return Build_Component_Subtype
1672 (Build_Discriminal_Record_Constraint
, Loc
, T
);
1679 -- If none of the above, the actual and nominal subtypes are the same
1682 end Build_Discriminal_Subtype_Of_Component
;
1684 ------------------------------
1685 -- Build_Elaboration_Entity --
1686 ------------------------------
1688 procedure Build_Elaboration_Entity
(N
: Node_Id
; Spec_Id
: Entity_Id
) is
1689 Loc
: constant Source_Ptr
:= Sloc
(N
);
1691 Elab_Ent
: Entity_Id
;
1693 procedure Set_Package_Name
(Ent
: Entity_Id
);
1694 -- Given an entity, sets the fully qualified name of the entity in
1695 -- Name_Buffer, with components separated by double underscores. This
1696 -- is a recursive routine that climbs the scope chain to Standard.
1698 ----------------------
1699 -- Set_Package_Name --
1700 ----------------------
1702 procedure Set_Package_Name
(Ent
: Entity_Id
) is
1704 if Scope
(Ent
) /= Standard_Standard
then
1705 Set_Package_Name
(Scope
(Ent
));
1708 Nam
: constant String := Get_Name_String
(Chars
(Ent
));
1710 Name_Buffer
(Name_Len
+ 1) := '_';
1711 Name_Buffer
(Name_Len
+ 2) := '_';
1712 Name_Buffer
(Name_Len
+ 3 .. Name_Len
+ Nam
'Length + 2) := Nam
;
1713 Name_Len
:= Name_Len
+ Nam
'Length + 2;
1717 Get_Name_String
(Chars
(Ent
));
1719 end Set_Package_Name
;
1721 -- Start of processing for Build_Elaboration_Entity
1724 -- Ignore call if already constructed
1726 if Present
(Elaboration_Entity
(Spec_Id
)) then
1729 -- Ignore in ASIS mode, elaboration entity is not in source and plays
1730 -- no role in analysis.
1732 elsif ASIS_Mode
then
1735 -- Do not generate an elaboration entity in GNATprove move because the
1736 -- elaboration counter is a form of expansion.
1738 elsif GNATprove_Mode
then
1741 -- See if we need elaboration entity
1743 -- We always need an elaboration entity when preserving control flow, as
1744 -- we want to remain explicit about the unit's elaboration order.
1746 elsif Opt
.Suppress_Control_Flow_Optimizations
then
1749 -- We always need an elaboration entity for the dynamic elaboration
1750 -- model, since it is needed to properly generate the PE exception for
1751 -- access before elaboration.
1753 elsif Dynamic_Elaboration_Checks
then
1756 -- For the static model, we don't need the elaboration counter if this
1757 -- unit is sure to have no elaboration code, since that means there
1758 -- is no elaboration unit to be called. Note that we can't just decide
1759 -- after the fact by looking to see whether there was elaboration code,
1760 -- because that's too late to make this decision.
1762 elsif Restriction_Active
(No_Elaboration_Code
) then
1765 -- Similarly, for the static model, we can skip the elaboration counter
1766 -- if we have the No_Multiple_Elaboration restriction, since for the
1767 -- static model, that's the only purpose of the counter (to avoid
1768 -- multiple elaboration).
1770 elsif Restriction_Active
(No_Multiple_Elaboration
) then
1774 -- Here we need the elaboration entity
1776 -- Construct name of elaboration entity as xxx_E, where xxx is the unit
1777 -- name with dots replaced by double underscore. We have to manually
1778 -- construct this name, since it will be elaborated in the outer scope,
1779 -- and thus will not have the unit name automatically prepended.
1781 Set_Package_Name
(Spec_Id
);
1782 Add_Str_To_Name_Buffer
("_E");
1784 -- Create elaboration counter
1786 Elab_Ent
:= Make_Defining_Identifier
(Loc
, Chars
=> Name_Find
);
1787 Set_Elaboration_Entity
(Spec_Id
, Elab_Ent
);
1790 Make_Object_Declaration
(Loc
,
1791 Defining_Identifier
=> Elab_Ent
,
1792 Object_Definition
=>
1793 New_Occurrence_Of
(Standard_Short_Integer
, Loc
),
1794 Expression
=> Make_Integer_Literal
(Loc
, Uint_0
));
1796 Push_Scope
(Standard_Standard
);
1797 Add_Global_Declaration
(Decl
);
1800 -- Reset True_Constant indication, since we will indeed assign a value
1801 -- to the variable in the binder main. We also kill the Current_Value
1802 -- and Last_Assignment fields for the same reason.
1804 Set_Is_True_Constant
(Elab_Ent
, False);
1805 Set_Current_Value
(Elab_Ent
, Empty
);
1806 Set_Last_Assignment
(Elab_Ent
, Empty
);
1808 -- We do not want any further qualification of the name (if we did not
1809 -- do this, we would pick up the name of the generic package in the case
1810 -- of a library level generic instantiation).
1812 Set_Has_Qualified_Name
(Elab_Ent
);
1813 Set_Has_Fully_Qualified_Name
(Elab_Ent
);
1814 end Build_Elaboration_Entity
;
1816 --------------------------------
1817 -- Build_Explicit_Dereference --
1818 --------------------------------
1820 procedure Build_Explicit_Dereference
1824 Loc
: constant Source_Ptr
:= Sloc
(Expr
);
1829 -- An entity of a type with a reference aspect is overloaded with
1830 -- both interpretations: with and without the dereference. Now that
1831 -- the dereference is made explicit, set the type of the node properly,
1832 -- to prevent anomalies in the backend. Same if the expression is an
1833 -- overloaded function call whose return type has a reference aspect.
1835 if Is_Entity_Name
(Expr
) then
1836 Set_Etype
(Expr
, Etype
(Entity
(Expr
)));
1838 -- The designated entity will not be examined again when resolving
1839 -- the dereference, so generate a reference to it now.
1841 Generate_Reference
(Entity
(Expr
), Expr
);
1843 elsif Nkind
(Expr
) = N_Function_Call
then
1845 -- If the name of the indexing function is overloaded, locate the one
1846 -- whose return type has an implicit dereference on the desired
1847 -- discriminant, and set entity and type of function call.
1849 if Is_Overloaded
(Name
(Expr
)) then
1850 Get_First_Interp
(Name
(Expr
), I
, It
);
1852 while Present
(It
.Nam
) loop
1853 if Ekind
((It
.Typ
)) = E_Record_Type
1854 and then First_Entity
((It
.Typ
)) = Disc
1856 Set_Entity
(Name
(Expr
), It
.Nam
);
1857 Set_Etype
(Name
(Expr
), Etype
(It
.Nam
));
1861 Get_Next_Interp
(I
, It
);
1865 -- Set type of call from resolved function name.
1867 Set_Etype
(Expr
, Etype
(Name
(Expr
)));
1870 Set_Is_Overloaded
(Expr
, False);
1872 -- The expression will often be a generalized indexing that yields a
1873 -- container element that is then dereferenced, in which case the
1874 -- generalized indexing call is also non-overloaded.
1876 if Nkind
(Expr
) = N_Indexed_Component
1877 and then Present
(Generalized_Indexing
(Expr
))
1879 Set_Is_Overloaded
(Generalized_Indexing
(Expr
), False);
1883 Make_Explicit_Dereference
(Loc
,
1885 Make_Selected_Component
(Loc
,
1886 Prefix
=> Relocate_Node
(Expr
),
1887 Selector_Name
=> New_Occurrence_Of
(Disc
, Loc
))));
1888 Set_Etype
(Prefix
(Expr
), Etype
(Disc
));
1889 Set_Etype
(Expr
, Designated_Type
(Etype
(Disc
)));
1890 end Build_Explicit_Dereference
;
1892 ---------------------------
1893 -- Build_Overriding_Spec --
1894 ---------------------------
1896 function Build_Overriding_Spec
1898 Typ
: Entity_Id
) return Node_Id
1900 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
1901 Par_Typ
: constant Entity_Id
:= Find_Dispatching_Type
(Op
);
1902 Spec
: constant Node_Id
:= Specification
(Unit_Declaration_Node
(Op
));
1904 Formal_Spec
: Node_Id
;
1905 Formal_Type
: Node_Id
;
1909 New_Spec
:= Copy_Subprogram_Spec
(Spec
);
1911 Formal_Spec
:= First
(Parameter_Specifications
(New_Spec
));
1912 while Present
(Formal_Spec
) loop
1913 Formal_Type
:= Parameter_Type
(Formal_Spec
);
1915 if Is_Entity_Name
(Formal_Type
)
1916 and then Entity
(Formal_Type
) = Par_Typ
1918 Rewrite
(Formal_Type
, New_Occurrence_Of
(Typ
, Loc
));
1921 -- Nothing needs to be done for access parameters
1927 end Build_Overriding_Spec
;
1929 -----------------------------------
1930 -- Cannot_Raise_Constraint_Error --
1931 -----------------------------------
1933 function Cannot_Raise_Constraint_Error
(Expr
: Node_Id
) return Boolean is
1935 if Compile_Time_Known_Value
(Expr
) then
1938 elsif Do_Range_Check
(Expr
) then
1941 elsif Raises_Constraint_Error
(Expr
) then
1945 case Nkind
(Expr
) is
1946 when N_Identifier
=>
1949 when N_Expanded_Name
=>
1952 when N_Selected_Component
=>
1953 return not Do_Discriminant_Check
(Expr
);
1955 when N_Attribute_Reference
=>
1956 if Do_Overflow_Check
(Expr
) then
1959 elsif No
(Expressions
(Expr
)) then
1967 N
:= First
(Expressions
(Expr
));
1968 while Present
(N
) loop
1969 if Cannot_Raise_Constraint_Error
(N
) then
1980 when N_Type_Conversion
=>
1981 if Do_Overflow_Check
(Expr
)
1982 or else Do_Length_Check
(Expr
)
1983 or else Do_Tag_Check
(Expr
)
1987 return Cannot_Raise_Constraint_Error
(Expression
(Expr
));
1990 when N_Unchecked_Type_Conversion
=>
1991 return Cannot_Raise_Constraint_Error
(Expression
(Expr
));
1994 if Do_Overflow_Check
(Expr
) then
1997 return Cannot_Raise_Constraint_Error
(Right_Opnd
(Expr
));
2004 if Do_Division_Check
(Expr
)
2006 Do_Overflow_Check
(Expr
)
2011 Cannot_Raise_Constraint_Error
(Left_Opnd
(Expr
))
2013 Cannot_Raise_Constraint_Error
(Right_Opnd
(Expr
));
2032 | N_Op_Shift_Right_Arithmetic
2036 if Do_Overflow_Check
(Expr
) then
2040 Cannot_Raise_Constraint_Error
(Left_Opnd
(Expr
))
2042 Cannot_Raise_Constraint_Error
(Right_Opnd
(Expr
));
2049 end Cannot_Raise_Constraint_Error
;
2051 -----------------------------------------
2052 -- Check_Dynamically_Tagged_Expression --
2053 -----------------------------------------
2055 procedure Check_Dynamically_Tagged_Expression
2058 Related_Nod
: Node_Id
)
2061 pragma Assert
(Is_Tagged_Type
(Typ
));
2063 -- In order to avoid spurious errors when analyzing the expanded code,
2064 -- this check is done only for nodes that come from source and for
2065 -- actuals of generic instantiations.
2067 if (Comes_From_Source
(Related_Nod
)
2068 or else In_Generic_Actual
(Expr
))
2069 and then (Is_Class_Wide_Type
(Etype
(Expr
))
2070 or else Is_Dynamically_Tagged
(Expr
))
2071 and then not Is_Class_Wide_Type
(Typ
)
2073 Error_Msg_N
("dynamically tagged expression not allowed!", Expr
);
2075 end Check_Dynamically_Tagged_Expression
;
2077 --------------------------
2078 -- Check_Fully_Declared --
2079 --------------------------
2081 procedure Check_Fully_Declared
(T
: Entity_Id
; N
: Node_Id
) is
2083 if Ekind
(T
) = E_Incomplete_Type
then
2085 -- Ada 2005 (AI-50217): If the type is available through a limited
2086 -- with_clause, verify that its full view has been analyzed.
2088 if From_Limited_With
(T
)
2089 and then Present
(Non_Limited_View
(T
))
2090 and then Ekind
(Non_Limited_View
(T
)) /= E_Incomplete_Type
2092 -- The non-limited view is fully declared
2098 ("premature usage of incomplete}", N
, First_Subtype
(T
));
2101 -- Need comments for these tests ???
2103 elsif Has_Private_Component
(T
)
2104 and then not Is_Generic_Type
(Root_Type
(T
))
2105 and then not In_Spec_Expression
2107 -- Special case: if T is the anonymous type created for a single
2108 -- task or protected object, use the name of the source object.
2110 if Is_Concurrent_Type
(T
)
2111 and then not Comes_From_Source
(T
)
2112 and then Nkind
(N
) = N_Object_Declaration
2115 ("type of& has incomplete component",
2116 N
, Defining_Identifier
(N
));
2119 ("premature usage of incomplete}",
2120 N
, First_Subtype
(T
));
2123 end Check_Fully_Declared
;
2125 -------------------------------------------
2126 -- Check_Function_With_Address_Parameter --
2127 -------------------------------------------
2129 procedure Check_Function_With_Address_Parameter
(Subp_Id
: Entity_Id
) is
2134 F
:= First_Formal
(Subp_Id
);
2135 while Present
(F
) loop
2138 if Is_Private_Type
(T
) and then Present
(Full_View
(T
)) then
2142 if Is_Descendant_Of_Address
(T
) or else Is_Limited_Type
(T
) then
2143 Set_Is_Pure
(Subp_Id
, False);
2149 end Check_Function_With_Address_Parameter
;
2151 -------------------------------------
2152 -- Check_Function_Writable_Actuals --
2153 -------------------------------------
2155 procedure Check_Function_Writable_Actuals
(N
: Node_Id
) is
2156 Writable_Actuals_List
: Elist_Id
:= No_Elist
;
2157 Identifiers_List
: Elist_Id
:= No_Elist
;
2158 Aggr_Error_Node
: Node_Id
:= Empty
;
2159 Error_Node
: Node_Id
:= Empty
;
2161 procedure Collect_Identifiers
(N
: Node_Id
);
2162 -- In a single traversal of subtree N collect in Writable_Actuals_List
2163 -- all the actuals of functions with writable actuals, and in the list
2164 -- Identifiers_List collect all the identifiers that are not actuals of
2165 -- functions with writable actuals. If a writable actual is referenced
2166 -- twice as writable actual then Error_Node is set to reference its
2167 -- second occurrence, the error is reported, and the tree traversal
2170 procedure Preanalyze_Without_Errors
(N
: Node_Id
);
2171 -- Preanalyze N without reporting errors. Very dubious, you can't just
2172 -- go analyzing things more than once???
2174 -------------------------
2175 -- Collect_Identifiers --
2176 -------------------------
2178 procedure Collect_Identifiers
(N
: Node_Id
) is
2180 function Check_Node
(N
: Node_Id
) return Traverse_Result
;
2181 -- Process a single node during the tree traversal to collect the
2182 -- writable actuals of functions and all the identifiers which are
2183 -- not writable actuals of functions.
2185 function Contains
(List
: Elist_Id
; N
: Node_Id
) return Boolean;
2186 -- Returns True if List has a node whose Entity is Entity (N)
2192 function Check_Node
(N
: Node_Id
) return Traverse_Result
is
2193 Is_Writable_Actual
: Boolean := False;
2197 if Nkind
(N
) = N_Identifier
then
2199 -- No analysis possible if the entity is not decorated
2201 if No
(Entity
(N
)) then
2204 -- Don't collect identifiers of packages, called functions, etc
2206 elsif Ekind_In
(Entity
(N
), E_Package
,
2213 -- For rewritten nodes, continue the traversal in the original
2214 -- subtree. Needed to handle aggregates in original expressions
2215 -- extracted from the tree by Remove_Side_Effects.
2217 elsif Is_Rewrite_Substitution
(N
) then
2218 Collect_Identifiers
(Original_Node
(N
));
2221 -- For now we skip aggregate discriminants, since they require
2222 -- performing the analysis in two phases to identify conflicts:
2223 -- first one analyzing discriminants and second one analyzing
2224 -- the rest of components (since at run time, discriminants are
2225 -- evaluated prior to components): too much computation cost
2226 -- to identify a corner case???
2228 elsif Nkind
(Parent
(N
)) = N_Component_Association
2229 and then Nkind_In
(Parent
(Parent
(N
)),
2231 N_Extension_Aggregate
)
2234 Choice
: constant Node_Id
:= First
(Choices
(Parent
(N
)));
2237 if Ekind
(Entity
(N
)) = E_Discriminant
then
2240 elsif Expression
(Parent
(N
)) = N
2241 and then Nkind
(Choice
) = N_Identifier
2242 and then Ekind
(Entity
(Choice
)) = E_Discriminant
2248 -- Analyze if N is a writable actual of a function
2250 elsif Nkind
(Parent
(N
)) = N_Function_Call
then
2252 Call
: constant Node_Id
:= Parent
(N
);
2257 Id
:= Get_Called_Entity
(Call
);
2259 -- In case of previous error, no check is possible
2265 if Ekind_In
(Id
, E_Function
, E_Generic_Function
)
2266 and then Has_Out_Or_In_Out_Parameter
(Id
)
2268 Formal
:= First_Formal
(Id
);
2269 Actual
:= First_Actual
(Call
);
2270 while Present
(Actual
) and then Present
(Formal
) loop
2272 if Ekind_In
(Formal
, E_Out_Parameter
,
2275 Is_Writable_Actual
:= True;
2281 Next_Formal
(Formal
);
2282 Next_Actual
(Actual
);
2288 if Is_Writable_Actual
then
2290 -- Skip checking the error in non-elementary types since
2291 -- RM 6.4.1(6.15/3) is restricted to elementary types, but
2292 -- store this actual in Writable_Actuals_List since it is
2293 -- needed to perform checks on other constructs that have
2294 -- arbitrary order of evaluation (for example, aggregates).
2296 if not Is_Elementary_Type
(Etype
(N
)) then
2297 if not Contains
(Writable_Actuals_List
, N
) then
2298 Append_New_Elmt
(N
, To
=> Writable_Actuals_List
);
2301 -- Second occurrence of an elementary type writable actual
2303 elsif Contains
(Writable_Actuals_List
, N
) then
2305 -- Report the error on the second occurrence of the
2306 -- identifier. We cannot assume that N is the second
2307 -- occurrence (according to their location in the
2308 -- sources), since Traverse_Func walks through Field2
2309 -- last (see comment in the body of Traverse_Func).
2315 Elmt
:= First_Elmt
(Writable_Actuals_List
);
2316 while Present
(Elmt
)
2317 and then Entity
(Node
(Elmt
)) /= Entity
(N
)
2322 if Sloc
(N
) > Sloc
(Node
(Elmt
)) then
2325 Error_Node
:= Node
(Elmt
);
2329 ("value may be affected by call to & "
2330 & "because order of evaluation is arbitrary",
2335 -- First occurrence of a elementary type writable actual
2338 Append_New_Elmt
(N
, To
=> Writable_Actuals_List
);
2342 if Identifiers_List
= No_Elist
then
2343 Identifiers_List
:= New_Elmt_List
;
2346 Append_Unique_Elmt
(N
, Identifiers_List
);
2359 N
: Node_Id
) return Boolean
2361 pragma Assert
(Nkind
(N
) in N_Has_Entity
);
2366 if List
= No_Elist
then
2370 Elmt
:= First_Elmt
(List
);
2371 while Present
(Elmt
) loop
2372 if Entity
(Node
(Elmt
)) = Entity
(N
) then
2386 procedure Do_Traversal
is new Traverse_Proc
(Check_Node
);
2387 -- The traversal procedure
2389 -- Start of processing for Collect_Identifiers
2392 if Present
(Error_Node
) then
2396 if Nkind
(N
) in N_Subexpr
and then Is_OK_Static_Expression
(N
) then
2401 end Collect_Identifiers
;
2403 -------------------------------
2404 -- Preanalyze_Without_Errors --
2405 -------------------------------
2407 procedure Preanalyze_Without_Errors
(N
: Node_Id
) is
2408 Status
: constant Boolean := Get_Ignore_Errors
;
2410 Set_Ignore_Errors
(True);
2412 Set_Ignore_Errors
(Status
);
2413 end Preanalyze_Without_Errors
;
2415 -- Start of processing for Check_Function_Writable_Actuals
2418 -- The check only applies to Ada 2012 code on which Check_Actuals has
2419 -- been set, and only to constructs that have multiple constituents
2420 -- whose order of evaluation is not specified by the language.
2422 if Ada_Version
< Ada_2012
2423 or else not Check_Actuals
(N
)
2424 or else (not (Nkind
(N
) in N_Op
)
2425 and then not (Nkind
(N
) in N_Membership_Test
)
2426 and then not Nkind_In
(N
, N_Range
,
2428 N_Extension_Aggregate
,
2429 N_Full_Type_Declaration
,
2431 N_Procedure_Call_Statement
,
2432 N_Entry_Call_Statement
))
2433 or else (Nkind
(N
) = N_Full_Type_Declaration
2434 and then not Is_Record_Type
(Defining_Identifier
(N
)))
2436 -- In addition, this check only applies to source code, not to code
2437 -- generated by constraint checks.
2439 or else not Comes_From_Source
(N
)
2444 -- If a construct C has two or more direct constituents that are names
2445 -- or expressions whose evaluation may occur in an arbitrary order, at
2446 -- least one of which contains a function call with an in out or out
2447 -- parameter, then the construct is legal only if: for each name N that
2448 -- is passed as a parameter of mode in out or out to some inner function
2449 -- call C2 (not including the construct C itself), there is no other
2450 -- name anywhere within a direct constituent of the construct C other
2451 -- than the one containing C2, that is known to refer to the same
2452 -- object (RM 6.4.1(6.17/3)).
2456 Collect_Identifiers
(Low_Bound
(N
));
2457 Collect_Identifiers
(High_Bound
(N
));
2459 when N_Membership_Test
2466 Collect_Identifiers
(Left_Opnd
(N
));
2468 if Present
(Right_Opnd
(N
)) then
2469 Collect_Identifiers
(Right_Opnd
(N
));
2472 if Nkind_In
(N
, N_In
, N_Not_In
)
2473 and then Present
(Alternatives
(N
))
2475 Expr
:= First
(Alternatives
(N
));
2476 while Present
(Expr
) loop
2477 Collect_Identifiers
(Expr
);
2484 when N_Full_Type_Declaration
=>
2486 function Get_Record_Part
(N
: Node_Id
) return Node_Id
;
2487 -- Return the record part of this record type definition
2489 function Get_Record_Part
(N
: Node_Id
) return Node_Id
is
2490 Type_Def
: constant Node_Id
:= Type_Definition
(N
);
2492 if Nkind
(Type_Def
) = N_Derived_Type_Definition
then
2493 return Record_Extension_Part
(Type_Def
);
2497 end Get_Record_Part
;
2500 Def_Id
: Entity_Id
:= Defining_Identifier
(N
);
2501 Rec
: Node_Id
:= Get_Record_Part
(N
);
2504 -- No need to perform any analysis if the record has no
2507 if No
(Rec
) or else No
(Component_List
(Rec
)) then
2511 -- Collect the identifiers starting from the deepest
2512 -- derivation. Done to report the error in the deepest
2516 if Present
(Component_List
(Rec
)) then
2517 Comp
:= First
(Component_Items
(Component_List
(Rec
)));
2518 while Present
(Comp
) loop
2519 if Nkind
(Comp
) = N_Component_Declaration
2520 and then Present
(Expression
(Comp
))
2522 Collect_Identifiers
(Expression
(Comp
));
2529 exit when No
(Underlying_Type
(Etype
(Def_Id
)))
2530 or else Base_Type
(Underlying_Type
(Etype
(Def_Id
)))
2533 Def_Id
:= Base_Type
(Underlying_Type
(Etype
(Def_Id
)));
2534 Rec
:= Get_Record_Part
(Parent
(Def_Id
));
2538 when N_Entry_Call_Statement
2542 Id
: constant Entity_Id
:= Get_Called_Entity
(N
);
2547 Formal
:= First_Formal
(Id
);
2548 Actual
:= First_Actual
(N
);
2549 while Present
(Actual
) and then Present
(Formal
) loop
2550 if Ekind_In
(Formal
, E_Out_Parameter
,
2553 Collect_Identifiers
(Actual
);
2556 Next_Formal
(Formal
);
2557 Next_Actual
(Actual
);
2562 | N_Extension_Aggregate
2567 Comp_Expr
: Node_Id
;
2570 -- Handle the N_Others_Choice of array aggregates with static
2571 -- bounds. There is no need to perform this analysis in
2572 -- aggregates without static bounds since we cannot evaluate
2573 -- if the N_Others_Choice covers several elements. There is
2574 -- no need to handle the N_Others choice of record aggregates
2575 -- since at this stage it has been already expanded by
2576 -- Resolve_Record_Aggregate.
2578 if Is_Array_Type
(Etype
(N
))
2579 and then Nkind
(N
) = N_Aggregate
2580 and then Present
(Aggregate_Bounds
(N
))
2581 and then Compile_Time_Known_Bounds
(Etype
(N
))
2582 and then Expr_Value
(High_Bound
(Aggregate_Bounds
(N
)))
2584 Expr_Value
(Low_Bound
(Aggregate_Bounds
(N
)))
2587 Count_Components
: Uint
:= Uint_0
;
2588 Num_Components
: Uint
;
2589 Others_Assoc
: Node_Id
;
2590 Others_Choice
: Node_Id
:= Empty
;
2591 Others_Box_Present
: Boolean := False;
2594 -- Count positional associations
2596 if Present
(Expressions
(N
)) then
2597 Comp_Expr
:= First
(Expressions
(N
));
2598 while Present
(Comp_Expr
) loop
2599 Count_Components
:= Count_Components
+ 1;
2604 -- Count the rest of elements and locate the N_Others
2607 Assoc
:= First
(Component_Associations
(N
));
2608 while Present
(Assoc
) loop
2609 Choice
:= First
(Choices
(Assoc
));
2610 while Present
(Choice
) loop
2611 if Nkind
(Choice
) = N_Others_Choice
then
2612 Others_Assoc
:= Assoc
;
2613 Others_Choice
:= Choice
;
2614 Others_Box_Present
:= Box_Present
(Assoc
);
2616 -- Count several components
2618 elsif Nkind_In
(Choice
, N_Range
,
2619 N_Subtype_Indication
)
2620 or else (Is_Entity_Name
(Choice
)
2621 and then Is_Type
(Entity
(Choice
)))
2626 Get_Index_Bounds
(Choice
, L
, H
);
2628 (Compile_Time_Known_Value
(L
)
2629 and then Compile_Time_Known_Value
(H
));
2632 + Expr_Value
(H
) - Expr_Value
(L
) + 1;
2635 -- Count single component. No other case available
2636 -- since we are handling an aggregate with static
2640 pragma Assert
(Is_OK_Static_Expression
(Choice
)
2641 or else Nkind
(Choice
) = N_Identifier
2642 or else Nkind
(Choice
) = N_Integer_Literal
);
2644 Count_Components
:= Count_Components
+ 1;
2654 Expr_Value
(High_Bound
(Aggregate_Bounds
(N
))) -
2655 Expr_Value
(Low_Bound
(Aggregate_Bounds
(N
))) + 1;
2657 pragma Assert
(Count_Components
<= Num_Components
);
2659 -- Handle the N_Others choice if it covers several
2662 if Present
(Others_Choice
)
2663 and then (Num_Components
- Count_Components
) > 1
2665 if not Others_Box_Present
then
2667 -- At this stage, if expansion is active, the
2668 -- expression of the others choice has not been
2669 -- analyzed. Hence we generate a duplicate and
2670 -- we analyze it silently to have available the
2671 -- minimum decoration required to collect the
2674 if not Expander_Active
then
2675 Comp_Expr
:= Expression
(Others_Assoc
);
2678 New_Copy_Tree
(Expression
(Others_Assoc
));
2679 Preanalyze_Without_Errors
(Comp_Expr
);
2682 Collect_Identifiers
(Comp_Expr
);
2684 if Writable_Actuals_List
/= No_Elist
then
2686 -- As suggested by Robert, at current stage we
2687 -- report occurrences of this case as warnings.
2690 ("writable function parameter may affect "
2691 & "value in other component because order "
2692 & "of evaluation is unspecified??",
2693 Node
(First_Elmt
(Writable_Actuals_List
)));
2699 -- For an array aggregate, a discrete_choice_list that has
2700 -- a nonstatic range is considered as two or more separate
2701 -- occurrences of the expression (RM 6.4.1(20/3)).
2703 elsif Is_Array_Type
(Etype
(N
))
2704 and then Nkind
(N
) = N_Aggregate
2705 and then Present
(Aggregate_Bounds
(N
))
2706 and then not Compile_Time_Known_Bounds
(Etype
(N
))
2708 -- Collect identifiers found in the dynamic bounds
2711 Count_Components
: Natural := 0;
2712 Low
, High
: Node_Id
;
2715 Assoc
:= First
(Component_Associations
(N
));
2716 while Present
(Assoc
) loop
2717 Choice
:= First
(Choices
(Assoc
));
2718 while Present
(Choice
) loop
2719 if Nkind_In
(Choice
, N_Range
,
2720 N_Subtype_Indication
)
2721 or else (Is_Entity_Name
(Choice
)
2722 and then Is_Type
(Entity
(Choice
)))
2724 Get_Index_Bounds
(Choice
, Low
, High
);
2726 if not Compile_Time_Known_Value
(Low
) then
2727 Collect_Identifiers
(Low
);
2729 if No
(Aggr_Error_Node
) then
2730 Aggr_Error_Node
:= Low
;
2734 if not Compile_Time_Known_Value
(High
) then
2735 Collect_Identifiers
(High
);
2737 if No
(Aggr_Error_Node
) then
2738 Aggr_Error_Node
:= High
;
2742 -- The RM rule is violated if there is more than
2743 -- a single choice in a component association.
2746 Count_Components
:= Count_Components
+ 1;
2748 if No
(Aggr_Error_Node
)
2749 and then Count_Components
> 1
2751 Aggr_Error_Node
:= Choice
;
2754 if not Compile_Time_Known_Value
(Choice
) then
2755 Collect_Identifiers
(Choice
);
2767 -- Handle ancestor part of extension aggregates
2769 if Nkind
(N
) = N_Extension_Aggregate
then
2770 Collect_Identifiers
(Ancestor_Part
(N
));
2773 -- Handle positional associations
2775 if Present
(Expressions
(N
)) then
2776 Comp_Expr
:= First
(Expressions
(N
));
2777 while Present
(Comp_Expr
) loop
2778 if not Is_OK_Static_Expression
(Comp_Expr
) then
2779 Collect_Identifiers
(Comp_Expr
);
2786 -- Handle discrete associations
2788 if Present
(Component_Associations
(N
)) then
2789 Assoc
:= First
(Component_Associations
(N
));
2790 while Present
(Assoc
) loop
2792 if not Box_Present
(Assoc
) then
2793 Choice
:= First
(Choices
(Assoc
));
2794 while Present
(Choice
) loop
2796 -- For now we skip discriminants since it requires
2797 -- performing the analysis in two phases: first one
2798 -- analyzing discriminants and second one analyzing
2799 -- the rest of components since discriminants are
2800 -- evaluated prior to components: too much extra
2801 -- work to detect a corner case???
2803 if Nkind
(Choice
) in N_Has_Entity
2804 and then Present
(Entity
(Choice
))
2805 and then Ekind
(Entity
(Choice
)) = E_Discriminant
2809 elsif Box_Present
(Assoc
) then
2813 if not Analyzed
(Expression
(Assoc
)) then
2815 New_Copy_Tree
(Expression
(Assoc
));
2816 Set_Parent
(Comp_Expr
, Parent
(N
));
2817 Preanalyze_Without_Errors
(Comp_Expr
);
2819 Comp_Expr
:= Expression
(Assoc
);
2822 Collect_Identifiers
(Comp_Expr
);
2838 -- No further action needed if we already reported an error
2840 if Present
(Error_Node
) then
2844 -- Check violation of RM 6.20/3 in aggregates
2846 if Present
(Aggr_Error_Node
)
2847 and then Writable_Actuals_List
/= No_Elist
2850 ("value may be affected by call in other component because they "
2851 & "are evaluated in unspecified order",
2852 Node
(First_Elmt
(Writable_Actuals_List
)));
2856 -- Check if some writable argument of a function is referenced
2858 if Writable_Actuals_List
/= No_Elist
2859 and then Identifiers_List
/= No_Elist
2866 Elmt_1
:= First_Elmt
(Writable_Actuals_List
);
2867 while Present
(Elmt_1
) loop
2868 Elmt_2
:= First_Elmt
(Identifiers_List
);
2869 while Present
(Elmt_2
) loop
2870 if Entity
(Node
(Elmt_1
)) = Entity
(Node
(Elmt_2
)) then
2871 case Nkind
(Parent
(Node
(Elmt_2
))) is
2873 | N_Component_Association
2874 | N_Component_Declaration
2877 ("value may be affected by call in other "
2878 & "component because they are evaluated "
2879 & "in unspecified order",
2886 ("value may be affected by call in other "
2887 & "alternative because they are evaluated "
2888 & "in unspecified order",
2893 ("value of actual may be affected by call in "
2894 & "other actual because they are evaluated "
2895 & "in unspecified order",
2907 end Check_Function_Writable_Actuals
;
2909 --------------------------------
2910 -- Check_Implicit_Dereference --
2911 --------------------------------
2913 procedure Check_Implicit_Dereference
(N
: Node_Id
; Typ
: Entity_Id
) is
2919 if Nkind
(N
) = N_Indexed_Component
2920 and then Present
(Generalized_Indexing
(N
))
2922 Nam
:= Generalized_Indexing
(N
);
2927 if Ada_Version
< Ada_2012
2928 or else not Has_Implicit_Dereference
(Base_Type
(Typ
))
2932 elsif not Comes_From_Source
(N
)
2933 and then Nkind
(N
) /= N_Indexed_Component
2937 elsif Is_Entity_Name
(Nam
) and then Is_Type
(Entity
(Nam
)) then
2941 Disc
:= First_Discriminant
(Typ
);
2942 while Present
(Disc
) loop
2943 if Has_Implicit_Dereference
(Disc
) then
2944 Desig
:= Designated_Type
(Etype
(Disc
));
2945 Add_One_Interp
(Nam
, Disc
, Desig
);
2947 -- If the node is a generalized indexing, add interpretation
2948 -- to that node as well, for subsequent resolution.
2950 if Nkind
(N
) = N_Indexed_Component
then
2951 Add_One_Interp
(N
, Disc
, Desig
);
2954 -- If the operation comes from a generic unit and the context
2955 -- is a selected component, the selector name may be global
2956 -- and set in the instance already. Remove the entity to
2957 -- force resolution of the selected component, and the
2958 -- generation of an explicit dereference if needed.
2961 and then Nkind
(Parent
(Nam
)) = N_Selected_Component
2963 Set_Entity
(Selector_Name
(Parent
(Nam
)), Empty
);
2969 Next_Discriminant
(Disc
);
2972 end Check_Implicit_Dereference
;
2974 ----------------------------------
2975 -- Check_Internal_Protected_Use --
2976 ----------------------------------
2978 procedure Check_Internal_Protected_Use
(N
: Node_Id
; Nam
: Entity_Id
) is
2986 while Present
(S
) loop
2987 if S
= Standard_Standard
then
2990 elsif Ekind
(S
) = E_Function
2991 and then Ekind
(Scope
(S
)) = E_Protected_Type
3001 and then Scope
(Nam
) = Prot
3002 and then Ekind
(Nam
) /= E_Function
3004 -- An indirect function call (e.g. a callback within a protected
3005 -- function body) is not statically illegal. If the access type is
3006 -- anonymous and is the type of an access parameter, the scope of Nam
3007 -- will be the protected type, but it is not a protected operation.
3009 if Ekind
(Nam
) = E_Subprogram_Type
3010 and then Nkind
(Associated_Node_For_Itype
(Nam
)) =
3011 N_Function_Specification
3015 elsif Nkind
(N
) = N_Subprogram_Renaming_Declaration
then
3017 ("within protected function cannot use protected procedure in "
3018 & "renaming or as generic actual", N
);
3020 elsif Nkind
(N
) = N_Attribute_Reference
then
3022 ("within protected function cannot take access of protected "
3027 ("within protected function, protected object is constant", N
);
3029 ("\cannot call operation that may modify it", N
);
3033 -- Verify that an internal call does not appear within a precondition
3034 -- of a protected operation. This implements AI12-0166.
3035 -- The precondition aspect has been rewritten as a pragma Precondition
3036 -- and we check whether the scope of the called subprogram is the same
3037 -- as that of the entity to which the aspect applies.
3039 if Convention
(Nam
) = Convention_Protected
then
3045 while Present
(P
) loop
3046 if Nkind
(P
) = N_Pragma
3047 and then Chars
(Pragma_Identifier
(P
)) = Name_Precondition
3048 and then From_Aspect_Specification
(P
)
3050 Scope
(Entity
(Corresponding_Aspect
(P
))) = Scope
(Nam
)
3053 ("internal call cannot appear in precondition of "
3054 & "protected operation", N
);
3057 elsif Nkind
(P
) = N_Pragma
3058 and then Chars
(Pragma_Identifier
(P
)) = Name_Contract_Cases
3060 -- Check whether call is in a case guard. It is legal in a
3064 while Present
(P
) loop
3065 if Nkind
(Parent
(P
)) = N_Component_Association
3066 and then P
/= Expression
(Parent
(P
))
3069 ("internal call cannot appear in case guard in a "
3070 & "contract case", N
);
3078 elsif Nkind
(P
) = N_Parameter_Specification
3079 and then Scope
(Current_Scope
) = Scope
(Nam
)
3080 and then Nkind_In
(Parent
(P
), N_Entry_Declaration
,
3081 N_Subprogram_Declaration
)
3084 ("internal call cannot appear in default for formal of "
3085 & "protected operation", N
);
3093 end Check_Internal_Protected_Use
;
3095 ---------------------------------------
3096 -- Check_Later_Vs_Basic_Declarations --
3097 ---------------------------------------
3099 procedure Check_Later_Vs_Basic_Declarations
3101 During_Parsing
: Boolean)
3103 Body_Sloc
: Source_Ptr
;
3106 function Is_Later_Declarative_Item
(Decl
: Node_Id
) return Boolean;
3107 -- Return whether Decl is considered as a declarative item.
3108 -- When During_Parsing is True, the semantics of Ada 83 is followed.
3109 -- When During_Parsing is False, the semantics of SPARK is followed.
3111 -------------------------------
3112 -- Is_Later_Declarative_Item --
3113 -------------------------------
3115 function Is_Later_Declarative_Item
(Decl
: Node_Id
) return Boolean is
3117 if Nkind
(Decl
) in N_Later_Decl_Item
then
3120 elsif Nkind
(Decl
) = N_Pragma
then
3123 elsif During_Parsing
then
3126 -- In SPARK, a package declaration is not considered as a later
3127 -- declarative item.
3129 elsif Nkind
(Decl
) = N_Package_Declaration
then
3132 -- In SPARK, a renaming is considered as a later declarative item
3134 elsif Nkind
(Decl
) in N_Renaming_Declaration
then
3140 end Is_Later_Declarative_Item
;
3142 -- Start of processing for Check_Later_Vs_Basic_Declarations
3145 Decl
:= First
(Decls
);
3147 -- Loop through sequence of basic declarative items
3149 Outer
: while Present
(Decl
) loop
3150 if not Nkind_In
(Decl
, N_Subprogram_Body
, N_Package_Body
, N_Task_Body
)
3151 and then Nkind
(Decl
) not in N_Body_Stub
3155 -- Once a body is encountered, we only allow later declarative
3156 -- items. The inner loop checks the rest of the list.
3159 Body_Sloc
:= Sloc
(Decl
);
3161 Inner
: while Present
(Decl
) loop
3162 if not Is_Later_Declarative_Item
(Decl
) then
3163 if During_Parsing
then
3164 if Ada_Version
= Ada_83
then
3165 Error_Msg_Sloc
:= Body_Sloc
;
3167 ("(Ada 83) decl cannot appear after body#", Decl
);
3170 Error_Msg_Sloc
:= Body_Sloc
;
3171 Check_SPARK_05_Restriction
3172 ("decl cannot appear after body#", Decl
);
3180 end Check_Later_Vs_Basic_Declarations
;
3182 ---------------------------
3183 -- Check_No_Hidden_State --
3184 ---------------------------
3186 procedure Check_No_Hidden_State
(Id
: Entity_Id
) is
3187 Context
: Entity_Id
:= Empty
;
3188 Not_Visible
: Boolean := False;
3192 pragma Assert
(Ekind_In
(Id
, E_Abstract_State
, E_Variable
));
3194 -- Find the proper context where the object or state appears
3197 while Present
(Scop
) loop
3200 -- Keep track of the context's visibility
3202 Not_Visible
:= Not_Visible
or else In_Private_Part
(Context
);
3204 -- Prevent the search from going too far
3206 if Context
= Standard_Standard
then
3209 -- Objects and states that appear immediately within a subprogram or
3210 -- inside a construct nested within a subprogram do not introduce a
3211 -- hidden state. They behave as local variable declarations.
3213 elsif Is_Subprogram
(Context
) then
3216 -- When examining a package body, use the entity of the spec as it
3217 -- carries the abstract state declarations.
3219 elsif Ekind
(Context
) = E_Package_Body
then
3220 Context
:= Spec_Entity
(Context
);
3223 -- Stop the traversal when a package subject to a null abstract state
3226 if Ekind_In
(Context
, E_Generic_Package
, E_Package
)
3227 and then Has_Null_Abstract_State
(Context
)
3232 Scop
:= Scope
(Scop
);
3235 -- At this point we know that there is at least one package with a null
3236 -- abstract state in visibility. Emit an error message unconditionally
3237 -- if the entity being processed is a state because the placement of the
3238 -- related package is irrelevant. This is not the case for objects as
3239 -- the intermediate context matters.
3241 if Present
(Context
)
3242 and then (Ekind
(Id
) = E_Abstract_State
or else Not_Visible
)
3244 Error_Msg_N
("cannot introduce hidden state &", Id
);
3245 Error_Msg_NE
("\package & has null abstract state", Id
, Context
);
3247 end Check_No_Hidden_State
;
3249 ----------------------------------------
3250 -- Check_Nonvolatile_Function_Profile --
3251 ----------------------------------------
3253 procedure Check_Nonvolatile_Function_Profile
(Func_Id
: Entity_Id
) is
3257 -- Inspect all formal parameters
3259 Formal
:= First_Formal
(Func_Id
);
3260 while Present
(Formal
) loop
3261 if Is_Effectively_Volatile
(Etype
(Formal
)) then
3263 ("nonvolatile function & cannot have a volatile parameter",
3267 Next_Formal
(Formal
);
3270 -- Inspect the return type
3272 if Is_Effectively_Volatile
(Etype
(Func_Id
)) then
3274 ("nonvolatile function & cannot have a volatile return type",
3275 Result_Definition
(Parent
(Func_Id
)), Func_Id
);
3277 end Check_Nonvolatile_Function_Profile
;
3279 -----------------------------
3280 -- Check_Part_Of_Reference --
3281 -----------------------------
3283 procedure Check_Part_Of_Reference
(Var_Id
: Entity_Id
; Ref
: Node_Id
) is
3284 function Is_Enclosing_Package_Body
3285 (Body_Decl
: Node_Id
;
3286 Obj_Id
: Entity_Id
) return Boolean;
3287 pragma Inline
(Is_Enclosing_Package_Body
);
3288 -- Determine whether package body Body_Decl or its corresponding spec
3289 -- immediately encloses the declaration of object Obj_Id.
3291 function Is_Internal_Declaration_Or_Body
3292 (Decl
: Node_Id
) return Boolean;
3293 pragma Inline
(Is_Internal_Declaration_Or_Body
);
3294 -- Determine whether declaration or body denoted by Decl is internal
3296 function Is_Single_Declaration_Or_Body
3298 Conc_Typ
: Entity_Id
) return Boolean;
3299 pragma Inline
(Is_Single_Declaration_Or_Body
);
3300 -- Determine whether protected/task declaration or body denoted by Decl
3301 -- belongs to single concurrent type Conc_Typ.
3303 function Is_Single_Task_Pragma
3305 Task_Typ
: Entity_Id
) return Boolean;
3306 pragma Inline
(Is_Single_Task_Pragma
);
3307 -- Determine whether pragma Prag belongs to single task type Task_Typ
3309 -------------------------------
3310 -- Is_Enclosing_Package_Body --
3311 -------------------------------
3313 function Is_Enclosing_Package_Body
3314 (Body_Decl
: Node_Id
;
3315 Obj_Id
: Entity_Id
) return Boolean
3317 Obj_Context
: Node_Id
;
3320 -- Find the context of the object declaration
3322 Obj_Context
:= Parent
(Declaration_Node
(Obj_Id
));
3324 if Nkind
(Obj_Context
) = N_Package_Specification
then
3325 Obj_Context
:= Parent
(Obj_Context
);
3328 -- The object appears immediately within the package body
3330 if Obj_Context
= Body_Decl
then
3333 -- The object appears immediately within the corresponding spec
3335 elsif Nkind
(Obj_Context
) = N_Package_Declaration
3336 and then Unit_Declaration_Node
(Corresponding_Spec
(Body_Decl
)) =
3343 end Is_Enclosing_Package_Body
;
3345 -------------------------------------
3346 -- Is_Internal_Declaration_Or_Body --
3347 -------------------------------------
3349 function Is_Internal_Declaration_Or_Body
3350 (Decl
: Node_Id
) return Boolean
3353 if Comes_From_Source
(Decl
) then
3356 -- A body generated for an expression function which has not been
3357 -- inserted into the tree yet (In_Spec_Expression is True) is not
3358 -- considered internal.
3360 elsif Nkind
(Decl
) = N_Subprogram_Body
3361 and then Was_Expression_Function
(Decl
)
3362 and then not In_Spec_Expression
3368 end Is_Internal_Declaration_Or_Body
;
3370 -----------------------------------
3371 -- Is_Single_Declaration_Or_Body --
3372 -----------------------------------
3374 function Is_Single_Declaration_Or_Body
3376 Conc_Typ
: Entity_Id
) return Boolean
3378 Spec_Id
: constant Entity_Id
:= Unique_Defining_Entity
(Decl
);
3382 Present
(Anonymous_Object
(Spec_Id
))
3383 and then Anonymous_Object
(Spec_Id
) = Conc_Typ
;
3384 end Is_Single_Declaration_Or_Body
;
3386 ---------------------------
3387 -- Is_Single_Task_Pragma --
3388 ---------------------------
3390 function Is_Single_Task_Pragma
3392 Task_Typ
: Entity_Id
) return Boolean
3394 Decl
: constant Node_Id
:= Find_Related_Declaration_Or_Body
(Prag
);
3397 -- To qualify, the pragma must be associated with single task type
3401 Is_Single_Task_Object
(Task_Typ
)
3402 and then Nkind
(Decl
) = N_Object_Declaration
3403 and then Defining_Entity
(Decl
) = Task_Typ
;
3404 end Is_Single_Task_Pragma
;
3408 Conc_Obj
: constant Entity_Id
:= Encapsulating_State
(Var_Id
);
3413 -- Start of processing for Check_Part_Of_Reference
3416 -- Nothing to do when the variable was recorded, but did not become a
3417 -- constituent of a single concurrent type.
3419 if No
(Conc_Obj
) then
3423 -- Traverse the parent chain looking for a suitable context for the
3424 -- reference to the concurrent constituent.
3427 Par
:= Parent
(Prev
);
3428 while Present
(Par
) loop
3429 if Nkind
(Par
) = N_Pragma
then
3430 Prag_Nam
:= Pragma_Name
(Par
);
3432 -- A concurrent constituent is allowed to appear in pragmas
3433 -- Initial_Condition and Initializes as this is part of the
3434 -- elaboration checks for the constituent (SPARK RM 9(3)).
3436 if Nam_In
(Prag_Nam
, Name_Initial_Condition
, Name_Initializes
) then
3439 -- When the reference appears within pragma Depends or Global,
3440 -- check whether the pragma applies to a single task type. Note
3441 -- that the pragma may not encapsulated by the type definition,
3442 -- but this is still a valid context.
3444 elsif Nam_In
(Prag_Nam
, Name_Depends
, Name_Global
)
3445 and then Is_Single_Task_Pragma
(Par
, Conc_Obj
)
3450 -- The reference appears somewhere in the definition of a single
3451 -- concurrent type (SPARK RM 9(3)).
3453 elsif Nkind_In
(Par
, N_Single_Protected_Declaration
,
3454 N_Single_Task_Declaration
)
3455 and then Defining_Entity
(Par
) = Conc_Obj
3459 -- The reference appears within the declaration or body of a single
3460 -- concurrent type (SPARK RM 9(3)).
3462 elsif Nkind_In
(Par
, N_Protected_Body
,
3463 N_Protected_Type_Declaration
,
3465 N_Task_Type_Declaration
)
3466 and then Is_Single_Declaration_Or_Body
(Par
, Conc_Obj
)
3470 -- The reference appears within the statement list of the object's
3471 -- immediately enclosing package (SPARK RM 9(3)).
3473 elsif Nkind
(Par
) = N_Package_Body
3474 and then Nkind
(Prev
) = N_Handled_Sequence_Of_Statements
3475 and then Is_Enclosing_Package_Body
(Par
, Var_Id
)
3479 -- The reference has been relocated within an internally generated
3480 -- package or subprogram. Assume that the reference is legal as the
3481 -- real check was already performed in the original context of the
3484 elsif Nkind_In
(Par
, N_Package_Body
,
3485 N_Package_Declaration
,
3487 N_Subprogram_Declaration
)
3488 and then Is_Internal_Declaration_Or_Body
(Par
)
3492 -- The reference has been relocated to an inlined body for GNATprove.
3493 -- Assume that the reference is legal as the real check was already
3494 -- performed in the original context of the reference.
3496 elsif GNATprove_Mode
3497 and then Nkind
(Par
) = N_Subprogram_Body
3498 and then Chars
(Defining_Entity
(Par
)) = Name_uParent
3504 Par
:= Parent
(Prev
);
3507 -- At this point it is known that the reference does not appear within a
3511 ("reference to variable & cannot appear in this context", Ref
, Var_Id
);
3512 Error_Msg_Name_1
:= Chars
(Var_Id
);
3514 if Is_Single_Protected_Object
(Conc_Obj
) then
3516 ("\% is constituent of single protected type &", Ref
, Conc_Obj
);
3520 ("\% is constituent of single task type &", Ref
, Conc_Obj
);
3522 end Check_Part_Of_Reference
;
3524 ------------------------------------------
3525 -- Check_Potentially_Blocking_Operation --
3526 ------------------------------------------
3528 procedure Check_Potentially_Blocking_Operation
(N
: Node_Id
) is
3532 -- N is one of the potentially blocking operations listed in 9.5.1(8).
3533 -- When pragma Detect_Blocking is active, the run time will raise
3534 -- Program_Error. Here we only issue a warning, since we generally
3535 -- support the use of potentially blocking operations in the absence
3538 -- Indirect blocking through a subprogram call cannot be diagnosed
3539 -- statically without interprocedural analysis, so we do not attempt
3542 S
:= Scope
(Current_Scope
);
3543 while Present
(S
) and then S
/= Standard_Standard
loop
3544 if Is_Protected_Type
(S
) then
3546 ("potentially blocking operation in protected operation??", N
);
3552 end Check_Potentially_Blocking_Operation
;
3554 ------------------------------------
3555 -- Check_Previous_Null_Procedure --
3556 ------------------------------------
3558 procedure Check_Previous_Null_Procedure
3563 if Ekind
(Prev
) = E_Procedure
3564 and then Nkind
(Parent
(Prev
)) = N_Procedure_Specification
3565 and then Null_Present
(Parent
(Prev
))
3567 Error_Msg_Sloc
:= Sloc
(Prev
);
3569 ("declaration cannot complete previous null procedure#", Decl
);
3571 end Check_Previous_Null_Procedure
;
3573 ---------------------------------
3574 -- Check_Result_And_Post_State --
3575 ---------------------------------
3577 procedure Check_Result_And_Post_State
(Subp_Id
: Entity_Id
) is
3578 procedure Check_Result_And_Post_State_In_Pragma
3580 Result_Seen
: in out Boolean);
3581 -- Determine whether pragma Prag mentions attribute 'Result and whether
3582 -- the pragma contains an expression that evaluates differently in pre-
3583 -- and post-state. Prag is a [refined] postcondition or a contract-cases
3584 -- pragma. Result_Seen is set when the pragma mentions attribute 'Result
3586 function Has_In_Out_Parameter
(Subp_Id
: Entity_Id
) return Boolean;
3587 -- Determine whether subprogram Subp_Id contains at least one IN OUT
3588 -- formal parameter.
3590 -------------------------------------------
3591 -- Check_Result_And_Post_State_In_Pragma --
3592 -------------------------------------------
3594 procedure Check_Result_And_Post_State_In_Pragma
3596 Result_Seen
: in out Boolean)
3598 procedure Check_Conjunct
(Expr
: Node_Id
);
3599 -- Check an individual conjunct in a conjunction of Boolean
3600 -- expressions, connected by "and" or "and then" operators.
3602 procedure Check_Conjuncts
(Expr
: Node_Id
);
3603 -- Apply the post-state check to every conjunct in an expression, in
3604 -- case this is a conjunction of Boolean expressions. Otherwise apply
3605 -- it to the expression as a whole.
3607 procedure Check_Expression
(Expr
: Node_Id
);
3608 -- Perform the 'Result and post-state checks on a given expression
3610 function Is_Function_Result
(N
: Node_Id
) return Traverse_Result
;
3611 -- Attempt to find attribute 'Result in a subtree denoted by N
3613 function Is_Trivial_Boolean
(N
: Node_Id
) return Boolean;
3614 -- Determine whether source node N denotes "True" or "False"
3616 function Mentions_Post_State
(N
: Node_Id
) return Boolean;
3617 -- Determine whether a subtree denoted by N mentions any construct
3618 -- that denotes a post-state.
3620 procedure Check_Function_Result
is
3621 new Traverse_Proc
(Is_Function_Result
);
3623 --------------------
3624 -- Check_Conjunct --
3625 --------------------
3627 procedure Check_Conjunct
(Expr
: Node_Id
) is
3628 function Adjust_Message
(Msg
: String) return String;
3629 -- Prepend a prefix to the input message Msg denoting that the
3630 -- message applies to a conjunct in the expression, when this
3633 function Applied_On_Conjunct
return Boolean;
3634 -- Returns True if the message applies to a conjunct in the
3635 -- expression, instead of the whole expression.
3637 function Has_Global_Output
(Subp
: Entity_Id
) return Boolean;
3638 -- Returns True if Subp has an output in its Global contract
3640 function Has_No_Output
(Subp
: Entity_Id
) return Boolean;
3641 -- Returns True if Subp has no declared output: no function
3642 -- result, no output parameter, and no output in its Global
3645 --------------------
3646 -- Adjust_Message --
3647 --------------------
3649 function Adjust_Message
(Msg
: String) return String is
3651 if Applied_On_Conjunct
then
3652 return "conjunct in " & Msg
;
3658 -------------------------
3659 -- Applied_On_Conjunct --
3660 -------------------------
3662 function Applied_On_Conjunct
return Boolean is
3664 -- Expr is the conjunct of an enclosing "and" expression
3666 return Nkind
(Parent
(Expr
)) in N_Subexpr
3668 -- or Expr is a conjunct of an enclosing "and then"
3669 -- expression in a postcondition aspect that was split into
3670 -- multiple pragmas. The first conjunct has the "and then"
3671 -- expression as Original_Node, and other conjuncts have
3672 -- Split_PCC set to True.
3674 or else Nkind
(Original_Node
(Expr
)) = N_And_Then
3675 or else Split_PPC
(Prag
);
3676 end Applied_On_Conjunct
;
3678 -----------------------
3679 -- Has_Global_Output --
3680 -----------------------
3682 function Has_Global_Output
(Subp
: Entity_Id
) return Boolean is
3683 Global
: constant Node_Id
:= Get_Pragma
(Subp
, Pragma_Global
);
3692 List
:= Expression
(Get_Argument
(Global
, Subp
));
3694 -- Empty list (no global items) or single global item
3695 -- declaration (only input items).
3697 if Nkind_In
(List
, N_Null
,
3700 N_Selected_Component
)
3704 -- Simple global list (only input items) or moded global list
3707 elsif Nkind
(List
) = N_Aggregate
then
3708 if Present
(Expressions
(List
)) then
3712 Assoc
:= First
(Component_Associations
(List
));
3713 while Present
(Assoc
) loop
3714 if Chars
(First
(Choices
(Assoc
))) /= Name_Input
then
3724 -- To accommodate partial decoration of disabled SPARK
3725 -- features, this routine may be called with illegal input.
3726 -- If this is the case, do not raise Program_Error.
3731 end Has_Global_Output
;
3737 function Has_No_Output
(Subp
: Entity_Id
) return Boolean is
3741 -- A function has its result as output
3743 if Ekind
(Subp
) = E_Function
then
3747 -- An OUT or IN OUT parameter is an output
3749 Param
:= First_Formal
(Subp
);
3750 while Present
(Param
) loop
3751 if Ekind_In
(Param
, E_Out_Parameter
, E_In_Out_Parameter
) then
3755 Next_Formal
(Param
);
3758 -- An item of mode Output or In_Out in the Global contract is
3761 if Has_Global_Output
(Subp
) then
3771 -- Error node when reporting a warning on a (refined)
3774 -- Start of processing for Check_Conjunct
3777 if Applied_On_Conjunct
then
3783 -- Do not report missing reference to outcome in postcondition if
3784 -- either the postcondition is trivially True or False, or if the
3785 -- subprogram is ghost and has no declared output.
3787 if not Is_Trivial_Boolean
(Expr
)
3788 and then not Mentions_Post_State
(Expr
)
3789 and then not (Is_Ghost_Entity
(Subp_Id
)
3790 and then Has_No_Output
(Subp_Id
))
3792 if Pragma_Name
(Prag
) = Name_Contract_Cases
then
3793 Error_Msg_NE
(Adjust_Message
3794 ("contract case does not check the outcome of calling "
3795 & "&?T?"), Expr
, Subp_Id
);
3797 elsif Pragma_Name
(Prag
) = Name_Refined_Post
then
3798 Error_Msg_NE
(Adjust_Message
3799 ("refined postcondition does not check the outcome of "
3800 & "calling &?T?"), Err_Node
, Subp_Id
);
3803 Error_Msg_NE
(Adjust_Message
3804 ("postcondition does not check the outcome of calling "
3805 & "&?T?"), Err_Node
, Subp_Id
);
3810 ---------------------
3811 -- Check_Conjuncts --
3812 ---------------------
3814 procedure Check_Conjuncts
(Expr
: Node_Id
) is
3816 if Nkind_In
(Expr
, N_Op_And
, N_And_Then
) then
3817 Check_Conjuncts
(Left_Opnd
(Expr
));
3818 Check_Conjuncts
(Right_Opnd
(Expr
));
3820 Check_Conjunct
(Expr
);
3822 end Check_Conjuncts
;
3824 ----------------------
3825 -- Check_Expression --
3826 ----------------------
3828 procedure Check_Expression
(Expr
: Node_Id
) is
3830 if not Is_Trivial_Boolean
(Expr
) then
3831 Check_Function_Result
(Expr
);
3832 Check_Conjuncts
(Expr
);
3834 end Check_Expression
;
3836 ------------------------
3837 -- Is_Function_Result --
3838 ------------------------
3840 function Is_Function_Result
(N
: Node_Id
) return Traverse_Result
is
3842 if Is_Attribute_Result
(N
) then
3843 Result_Seen
:= True;
3846 -- Continue the traversal
3851 end Is_Function_Result
;
3853 ------------------------
3854 -- Is_Trivial_Boolean --
3855 ------------------------
3857 function Is_Trivial_Boolean
(N
: Node_Id
) return Boolean is
3860 Comes_From_Source
(N
)
3861 and then Is_Entity_Name
(N
)
3862 and then (Entity
(N
) = Standard_True
3864 Entity
(N
) = Standard_False
);
3865 end Is_Trivial_Boolean
;
3867 -------------------------
3868 -- Mentions_Post_State --
3869 -------------------------
3871 function Mentions_Post_State
(N
: Node_Id
) return Boolean is
3872 Post_State_Seen
: Boolean := False;
3874 function Is_Post_State
(N
: Node_Id
) return Traverse_Result
;
3875 -- Attempt to find a construct that denotes a post-state. If this
3876 -- is the case, set flag Post_State_Seen.
3882 function Is_Post_State
(N
: Node_Id
) return Traverse_Result
is
3886 if Nkind_In
(N
, N_Explicit_Dereference
, N_Function_Call
) then
3887 Post_State_Seen
:= True;
3890 elsif Nkind_In
(N
, N_Expanded_Name
, N_Identifier
) then
3893 -- Treat an undecorated reference as OK
3897 -- A reference to an assignable entity is considered a
3898 -- change in the post-state of a subprogram.
3900 or else Ekind_In
(Ent
, E_Generic_In_Out_Parameter
,
3905 -- The reference may be modified through a dereference
3907 or else (Is_Access_Type
(Etype
(Ent
))
3908 and then Nkind
(Parent
(N
)) =
3909 N_Selected_Component
)
3911 Post_State_Seen
:= True;
3915 elsif Nkind
(N
) = N_Attribute_Reference
then
3916 if Attribute_Name
(N
) = Name_Old
then
3919 elsif Attribute_Name
(N
) = Name_Result
then
3920 Post_State_Seen
:= True;
3928 procedure Find_Post_State
is new Traverse_Proc
(Is_Post_State
);
3930 -- Start of processing for Mentions_Post_State
3933 Find_Post_State
(N
);
3935 return Post_State_Seen
;
3936 end Mentions_Post_State
;
3940 Expr
: constant Node_Id
:=
3942 (First
(Pragma_Argument_Associations
(Prag
)));
3943 Nam
: constant Name_Id
:= Pragma_Name
(Prag
);
3946 -- Start of processing for Check_Result_And_Post_State_In_Pragma
3949 -- Examine all consequences
3951 if Nam
= Name_Contract_Cases
then
3952 CCase
:= First
(Component_Associations
(Expr
));
3953 while Present
(CCase
) loop
3954 Check_Expression
(Expression
(CCase
));
3959 -- Examine the expression of a postcondition
3961 else pragma Assert
(Nam_In
(Nam
, Name_Postcondition
,
3962 Name_Refined_Post
));
3963 Check_Expression
(Expr
);
3965 end Check_Result_And_Post_State_In_Pragma
;
3967 --------------------------
3968 -- Has_In_Out_Parameter --
3969 --------------------------
3971 function Has_In_Out_Parameter
(Subp_Id
: Entity_Id
) return Boolean is
3975 -- Traverse the formals looking for an IN OUT parameter
3977 Formal
:= First_Formal
(Subp_Id
);
3978 while Present
(Formal
) loop
3979 if Ekind
(Formal
) = E_In_Out_Parameter
then
3983 Next_Formal
(Formal
);
3987 end Has_In_Out_Parameter
;
3991 Items
: constant Node_Id
:= Contract
(Subp_Id
);
3992 Subp_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Subp_Id
);
3993 Case_Prag
: Node_Id
:= Empty
;
3994 Post_Prag
: Node_Id
:= Empty
;
3996 Seen_In_Case
: Boolean := False;
3997 Seen_In_Post
: Boolean := False;
3998 Spec_Id
: Entity_Id
;
4000 -- Start of processing for Check_Result_And_Post_State
4003 -- The lack of attribute 'Result or a post-state is classified as a
4004 -- suspicious contract. Do not perform the check if the corresponding
4005 -- swich is not set.
4007 if not Warn_On_Suspicious_Contract
then
4010 -- Nothing to do if there is no contract
4012 elsif No
(Items
) then
4016 -- Retrieve the entity of the subprogram spec (if any)
4018 if Nkind
(Subp_Decl
) = N_Subprogram_Body
4019 and then Present
(Corresponding_Spec
(Subp_Decl
))
4021 Spec_Id
:= Corresponding_Spec
(Subp_Decl
);
4023 elsif Nkind
(Subp_Decl
) = N_Subprogram_Body_Stub
4024 and then Present
(Corresponding_Spec_Of_Stub
(Subp_Decl
))
4026 Spec_Id
:= Corresponding_Spec_Of_Stub
(Subp_Decl
);
4032 -- Examine all postconditions for attribute 'Result and a post-state
4034 Prag
:= Pre_Post_Conditions
(Items
);
4035 while Present
(Prag
) loop
4036 if Nam_In
(Pragma_Name_Unmapped
(Prag
),
4037 Name_Postcondition
, Name_Refined_Post
)
4038 and then not Error_Posted
(Prag
)
4041 Check_Result_And_Post_State_In_Pragma
(Prag
, Seen_In_Post
);
4044 Prag
:= Next_Pragma
(Prag
);
4047 -- Examine the contract cases of the subprogram for attribute 'Result
4048 -- and a post-state.
4050 Prag
:= Contract_Test_Cases
(Items
);
4051 while Present
(Prag
) loop
4052 if Pragma_Name
(Prag
) = Name_Contract_Cases
4053 and then not Error_Posted
(Prag
)
4056 Check_Result_And_Post_State_In_Pragma
(Prag
, Seen_In_Case
);
4059 Prag
:= Next_Pragma
(Prag
);
4062 -- Do not emit any errors if the subprogram is not a function
4064 if not Ekind_In
(Spec_Id
, E_Function
, E_Generic_Function
) then
4067 -- Regardless of whether the function has postconditions or contract
4068 -- cases, or whether they mention attribute 'Result, an IN OUT formal
4069 -- parameter is always treated as a result.
4071 elsif Has_In_Out_Parameter
(Spec_Id
) then
4074 -- The function has both a postcondition and contract cases and they do
4075 -- not mention attribute 'Result.
4077 elsif Present
(Case_Prag
)
4078 and then not Seen_In_Case
4079 and then Present
(Post_Prag
)
4080 and then not Seen_In_Post
4083 ("neither postcondition nor contract cases mention function "
4084 & "result?T?", Post_Prag
);
4086 -- The function has contract cases only and they do not mention
4087 -- attribute 'Result.
4089 elsif Present
(Case_Prag
) and then not Seen_In_Case
then
4090 Error_Msg_N
("contract cases do not mention result?T?", Case_Prag
);
4092 -- The function has postconditions only and they do not mention
4093 -- attribute 'Result.
4095 elsif Present
(Post_Prag
) and then not Seen_In_Post
then
4097 ("postcondition does not mention function result?T?", Post_Prag
);
4099 end Check_Result_And_Post_State
;
4101 -----------------------------
4102 -- Check_State_Refinements --
4103 -----------------------------
4105 procedure Check_State_Refinements
4107 Is_Main_Unit
: Boolean := False)
4109 procedure Check_Package
(Pack
: Node_Id
);
4110 -- Verify that all abstract states of a [generic] package denoted by its
4111 -- declarative node Pack have proper refinement. Recursively verify the
4112 -- visible and private declarations of the [generic] package for other
4115 procedure Check_Packages_In
(Decls
: List_Id
);
4116 -- Seek out [generic] package declarations within declarative list Decls
4117 -- and verify the status of their abstract state refinement.
4119 function SPARK_Mode_Is_Off
(N
: Node_Id
) return Boolean;
4120 -- Determine whether construct N is subject to pragma SPARK_Mode Off
4126 procedure Check_Package
(Pack
: Node_Id
) is
4127 Body_Id
: constant Entity_Id
:= Corresponding_Body
(Pack
);
4128 Spec
: constant Node_Id
:= Specification
(Pack
);
4129 States
: constant Elist_Id
:=
4130 Abstract_States
(Defining_Entity
(Pack
));
4132 State_Elmt
: Elmt_Id
;
4133 State_Id
: Entity_Id
;
4136 -- Do not verify proper state refinement when the package is subject
4137 -- to pragma SPARK_Mode Off because this disables the requirement for
4138 -- state refinement.
4140 if SPARK_Mode_Is_Off
(Pack
) then
4143 -- State refinement can only occur in a completing package body. Do
4144 -- not verify proper state refinement when the body is subject to
4145 -- pragma SPARK_Mode Off because this disables the requirement for
4146 -- state refinement.
4148 elsif Present
(Body_Id
)
4149 and then SPARK_Mode_Is_Off
(Unit_Declaration_Node
(Body_Id
))
4153 -- Do not verify proper state refinement when the package is an
4154 -- instance as this check was already performed in the generic.
4156 elsif Present
(Generic_Parent
(Spec
)) then
4159 -- Otherwise examine the contents of the package
4162 if Present
(States
) then
4163 State_Elmt
:= First_Elmt
(States
);
4164 while Present
(State_Elmt
) loop
4165 State_Id
:= Node
(State_Elmt
);
4167 -- Emit an error when a non-null state lacks any form of
4170 if not Is_Null_State
(State_Id
)
4171 and then not Has_Null_Refinement
(State_Id
)
4172 and then not Has_Non_Null_Refinement
(State_Id
)
4174 Error_Msg_N
("state & requires refinement", State_Id
);
4177 Next_Elmt
(State_Elmt
);
4181 Check_Packages_In
(Visible_Declarations
(Spec
));
4182 Check_Packages_In
(Private_Declarations
(Spec
));
4186 -----------------------
4187 -- Check_Packages_In --
4188 -----------------------
4190 procedure Check_Packages_In
(Decls
: List_Id
) is
4194 if Present
(Decls
) then
4195 Decl
:= First
(Decls
);
4196 while Present
(Decl
) loop
4197 if Nkind_In
(Decl
, N_Generic_Package_Declaration
,
4198 N_Package_Declaration
)
4200 Check_Package
(Decl
);
4206 end Check_Packages_In
;
4208 -----------------------
4209 -- SPARK_Mode_Is_Off --
4210 -----------------------
4212 function SPARK_Mode_Is_Off
(N
: Node_Id
) return Boolean is
4213 Id
: constant Entity_Id
:= Defining_Entity
(N
);
4214 Prag
: constant Node_Id
:= SPARK_Pragma
(Id
);
4217 -- Default the mode to "off" when the context is an instance and all
4218 -- SPARK_Mode pragmas found within are to be ignored.
4220 if Ignore_SPARK_Mode_Pragmas
(Id
) then
4226 and then Get_SPARK_Mode_From_Annotation
(Prag
) = Off
;
4228 end SPARK_Mode_Is_Off
;
4230 -- Start of processing for Check_State_Refinements
4233 -- A block may declare a nested package
4235 if Nkind
(Context
) = N_Block_Statement
then
4236 Check_Packages_In
(Declarations
(Context
));
4238 -- An entry, protected, subprogram, or task body may declare a nested
4241 elsif Nkind_In
(Context
, N_Entry_Body
,
4246 -- Do not verify proper state refinement when the body is subject to
4247 -- pragma SPARK_Mode Off because this disables the requirement for
4248 -- state refinement.
4250 if not SPARK_Mode_Is_Off
(Context
) then
4251 Check_Packages_In
(Declarations
(Context
));
4254 -- A package body may declare a nested package
4256 elsif Nkind
(Context
) = N_Package_Body
then
4257 Check_Package
(Unit_Declaration_Node
(Corresponding_Spec
(Context
)));
4259 -- Do not verify proper state refinement when the body is subject to
4260 -- pragma SPARK_Mode Off because this disables the requirement for
4261 -- state refinement.
4263 if not SPARK_Mode_Is_Off
(Context
) then
4264 Check_Packages_In
(Declarations
(Context
));
4267 -- A library level [generic] package may declare a nested package
4269 elsif Nkind_In
(Context
, N_Generic_Package_Declaration
,
4270 N_Package_Declaration
)
4271 and then Is_Main_Unit
4273 Check_Package
(Context
);
4275 end Check_State_Refinements
;
4277 ------------------------------
4278 -- Check_Unprotected_Access --
4279 ------------------------------
4281 procedure Check_Unprotected_Access
4285 Cont_Encl_Typ
: Entity_Id
;
4286 Pref_Encl_Typ
: Entity_Id
;
4288 function Enclosing_Protected_Type
(Obj
: Node_Id
) return Entity_Id
;
4289 -- Check whether Obj is a private component of a protected object.
4290 -- Return the protected type where the component resides, Empty
4293 function Is_Public_Operation
return Boolean;
4294 -- Verify that the enclosing operation is callable from outside the
4295 -- protected object, to minimize false positives.
4297 ------------------------------
4298 -- Enclosing_Protected_Type --
4299 ------------------------------
4301 function Enclosing_Protected_Type
(Obj
: Node_Id
) return Entity_Id
is
4303 if Is_Entity_Name
(Obj
) then
4305 Ent
: Entity_Id
:= Entity
(Obj
);
4308 -- The object can be a renaming of a private component, use
4309 -- the original record component.
4311 if Is_Prival
(Ent
) then
4312 Ent
:= Prival_Link
(Ent
);
4315 if Is_Protected_Type
(Scope
(Ent
)) then
4321 -- For indexed and selected components, recursively check the prefix
4323 if Nkind_In
(Obj
, N_Indexed_Component
, N_Selected_Component
) then
4324 return Enclosing_Protected_Type
(Prefix
(Obj
));
4326 -- The object does not denote a protected component
4331 end Enclosing_Protected_Type
;
4333 -------------------------
4334 -- Is_Public_Operation --
4335 -------------------------
4337 function Is_Public_Operation
return Boolean is
4343 while Present
(S
) and then S
/= Pref_Encl_Typ
loop
4344 if Scope
(S
) = Pref_Encl_Typ
then
4345 E
:= First_Entity
(Pref_Encl_Typ
);
4347 and then E
/= First_Private_Entity
(Pref_Encl_Typ
)
4361 end Is_Public_Operation
;
4363 -- Start of processing for Check_Unprotected_Access
4366 if Nkind
(Expr
) = N_Attribute_Reference
4367 and then Attribute_Name
(Expr
) = Name_Unchecked_Access
4369 Cont_Encl_Typ
:= Enclosing_Protected_Type
(Context
);
4370 Pref_Encl_Typ
:= Enclosing_Protected_Type
(Prefix
(Expr
));
4372 -- Check whether we are trying to export a protected component to a
4373 -- context with an equal or lower access level.
4375 if Present
(Pref_Encl_Typ
)
4376 and then No
(Cont_Encl_Typ
)
4377 and then Is_Public_Operation
4378 and then Scope_Depth
(Pref_Encl_Typ
) >=
4379 Object_Access_Level
(Context
)
4382 ("??possible unprotected access to protected data", Expr
);
4385 end Check_Unprotected_Access
;
4387 ------------------------------
4388 -- Check_Unused_Body_States --
4389 ------------------------------
4391 procedure Check_Unused_Body_States
(Body_Id
: Entity_Id
) is
4392 procedure Process_Refinement_Clause
4395 -- Inspect all constituents of refinement clause Clause and remove any
4396 -- matches from body state list States.
4398 procedure Report_Unused_Body_States
(States
: Elist_Id
);
4399 -- Emit errors for each abstract state or object found in list States
4401 -------------------------------
4402 -- Process_Refinement_Clause --
4403 -------------------------------
4405 procedure Process_Refinement_Clause
4409 procedure Process_Constituent
(Constit
: Node_Id
);
4410 -- Remove constituent Constit from body state list States
4412 -------------------------
4413 -- Process_Constituent --
4414 -------------------------
4416 procedure Process_Constituent
(Constit
: Node_Id
) is
4417 Constit_Id
: Entity_Id
;
4420 -- Guard against illegal constituents. Only abstract states and
4421 -- objects can appear on the right hand side of a refinement.
4423 if Is_Entity_Name
(Constit
) then
4424 Constit_Id
:= Entity_Of
(Constit
);
4426 if Present
(Constit_Id
)
4427 and then Ekind_In
(Constit_Id
, E_Abstract_State
,
4431 Remove
(States
, Constit_Id
);
4434 end Process_Constituent
;
4440 -- Start of processing for Process_Refinement_Clause
4443 if Nkind
(Clause
) = N_Component_Association
then
4444 Constit
:= Expression
(Clause
);
4446 -- Multiple constituents appear as an aggregate
4448 if Nkind
(Constit
) = N_Aggregate
then
4449 Constit
:= First
(Expressions
(Constit
));
4450 while Present
(Constit
) loop
4451 Process_Constituent
(Constit
);
4455 -- Various forms of a single constituent
4458 Process_Constituent
(Constit
);
4461 end Process_Refinement_Clause
;
4463 -------------------------------
4464 -- Report_Unused_Body_States --
4465 -------------------------------
4467 procedure Report_Unused_Body_States
(States
: Elist_Id
) is
4468 Posted
: Boolean := False;
4469 State_Elmt
: Elmt_Id
;
4470 State_Id
: Entity_Id
;
4473 if Present
(States
) then
4474 State_Elmt
:= First_Elmt
(States
);
4475 while Present
(State_Elmt
) loop
4476 State_Id
:= Node
(State_Elmt
);
4478 -- Constants are part of the hidden state of a package, but the
4479 -- compiler cannot determine whether they have variable input
4480 -- (SPARK RM 7.1.1(2)) and cannot classify them properly as a
4481 -- hidden state. Do not emit an error when a constant does not
4482 -- participate in a state refinement, even though it acts as a
4485 if Ekind
(State_Id
) = E_Constant
then
4488 -- Generate an error message of the form:
4490 -- body of package ... has unused hidden states
4491 -- abstract state ... defined at ...
4492 -- variable ... defined at ...
4498 ("body of package & has unused hidden states", Body_Id
);
4501 Error_Msg_Sloc
:= Sloc
(State_Id
);
4503 if Ekind
(State_Id
) = E_Abstract_State
then
4505 ("\abstract state & defined #", Body_Id
, State_Id
);
4508 SPARK_Msg_NE
("\variable & defined #", Body_Id
, State_Id
);
4512 Next_Elmt
(State_Elmt
);
4515 end Report_Unused_Body_States
;
4519 Prag
: constant Node_Id
:= Get_Pragma
(Body_Id
, Pragma_Refined_State
);
4520 Spec_Id
: constant Entity_Id
:= Spec_Entity
(Body_Id
);
4524 -- Start of processing for Check_Unused_Body_States
4527 -- Inspect the clauses of pragma Refined_State and determine whether all
4528 -- visible states declared within the package body participate in the
4531 if Present
(Prag
) then
4532 Clause
:= Expression
(Get_Argument
(Prag
, Spec_Id
));
4533 States
:= Collect_Body_States
(Body_Id
);
4535 -- Multiple non-null state refinements appear as an aggregate
4537 if Nkind
(Clause
) = N_Aggregate
then
4538 Clause
:= First
(Component_Associations
(Clause
));
4539 while Present
(Clause
) loop
4540 Process_Refinement_Clause
(Clause
, States
);
4544 -- Various forms of a single state refinement
4547 Process_Refinement_Clause
(Clause
, States
);
4550 -- Ensure that all abstract states and objects declared in the
4551 -- package body state space are utilized as constituents.
4553 Report_Unused_Body_States
(States
);
4555 end Check_Unused_Body_States
;
4561 function Choice_List
(N
: Node_Id
) return List_Id
is
4563 if Nkind
(N
) = N_Iterated_Component_Association
then
4564 return Discrete_Choices
(N
);
4570 -------------------------
4571 -- Collect_Body_States --
4572 -------------------------
4574 function Collect_Body_States
(Body_Id
: Entity_Id
) return Elist_Id
is
4575 function Is_Visible_Object
(Obj_Id
: Entity_Id
) return Boolean;
4576 -- Determine whether object Obj_Id is a suitable visible state of a
4579 procedure Collect_Visible_States
4580 (Pack_Id
: Entity_Id
;
4581 States
: in out Elist_Id
);
4582 -- Gather the entities of all abstract states and objects declared in
4583 -- the visible state space of package Pack_Id.
4585 ----------------------------
4586 -- Collect_Visible_States --
4587 ----------------------------
4589 procedure Collect_Visible_States
4590 (Pack_Id
: Entity_Id
;
4591 States
: in out Elist_Id
)
4593 Item_Id
: Entity_Id
;
4596 -- Traverse the entity chain of the package and inspect all visible
4599 Item_Id
:= First_Entity
(Pack_Id
);
4600 while Present
(Item_Id
) and then not In_Private_Part
(Item_Id
) loop
4602 -- Do not consider internally generated items as those cannot be
4603 -- named and participate in refinement.
4605 if not Comes_From_Source
(Item_Id
) then
4608 elsif Ekind
(Item_Id
) = E_Abstract_State
then
4609 Append_New_Elmt
(Item_Id
, States
);
4611 elsif Ekind_In
(Item_Id
, E_Constant
, E_Variable
)
4612 and then Is_Visible_Object
(Item_Id
)
4614 Append_New_Elmt
(Item_Id
, States
);
4616 -- Recursively gather the visible states of a nested package
4618 elsif Ekind
(Item_Id
) = E_Package
then
4619 Collect_Visible_States
(Item_Id
, States
);
4622 Next_Entity
(Item_Id
);
4624 end Collect_Visible_States
;
4626 -----------------------
4627 -- Is_Visible_Object --
4628 -----------------------
4630 function Is_Visible_Object
(Obj_Id
: Entity_Id
) return Boolean is
4632 -- Objects that map generic formals to their actuals are not visible
4633 -- from outside the generic instantiation.
4635 if Present
(Corresponding_Generic_Association
4636 (Declaration_Node
(Obj_Id
)))
4640 -- Constituents of a single protected/task type act as components of
4641 -- the type and are not visible from outside the type.
4643 elsif Ekind
(Obj_Id
) = E_Variable
4644 and then Present
(Encapsulating_State
(Obj_Id
))
4645 and then Is_Single_Concurrent_Object
(Encapsulating_State
(Obj_Id
))
4652 end Is_Visible_Object
;
4656 Body_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Body_Id
);
4658 Item_Id
: Entity_Id
;
4659 States
: Elist_Id
:= No_Elist
;
4661 -- Start of processing for Collect_Body_States
4664 -- Inspect the declarations of the body looking for source objects,
4665 -- packages and package instantiations. Note that even though this
4666 -- processing is very similar to Collect_Visible_States, a package
4667 -- body does not have a First/Next_Entity list.
4669 Decl
:= First
(Declarations
(Body_Decl
));
4670 while Present
(Decl
) loop
4672 -- Capture source objects as internally generated temporaries cannot
4673 -- be named and participate in refinement.
4675 if Nkind
(Decl
) = N_Object_Declaration
then
4676 Item_Id
:= Defining_Entity
(Decl
);
4678 if Comes_From_Source
(Item_Id
)
4679 and then Is_Visible_Object
(Item_Id
)
4681 Append_New_Elmt
(Item_Id
, States
);
4684 -- Capture the visible abstract states and objects of a source
4685 -- package [instantiation].
4687 elsif Nkind
(Decl
) = N_Package_Declaration
then
4688 Item_Id
:= Defining_Entity
(Decl
);
4690 if Comes_From_Source
(Item_Id
) then
4691 Collect_Visible_States
(Item_Id
, States
);
4699 end Collect_Body_States
;
4701 ------------------------
4702 -- Collect_Interfaces --
4703 ------------------------
4705 procedure Collect_Interfaces
4707 Ifaces_List
: out Elist_Id
;
4708 Exclude_Parents
: Boolean := False;
4709 Use_Full_View
: Boolean := True)
4711 procedure Collect
(Typ
: Entity_Id
);
4712 -- Subsidiary subprogram used to traverse the whole list
4713 -- of directly and indirectly implemented interfaces
4719 procedure Collect
(Typ
: Entity_Id
) is
4720 Ancestor
: Entity_Id
;
4728 -- Handle private types and subtypes
4731 and then Is_Private_Type
(Typ
)
4732 and then Present
(Full_View
(Typ
))
4734 Full_T
:= Full_View
(Typ
);
4736 if Ekind
(Full_T
) = E_Record_Subtype
then
4737 Full_T
:= Etype
(Typ
);
4739 if Present
(Full_View
(Full_T
)) then
4740 Full_T
:= Full_View
(Full_T
);
4745 -- Include the ancestor if we are generating the whole list of
4746 -- abstract interfaces.
4748 if Etype
(Full_T
) /= Typ
4750 -- Protect the frontend against wrong sources. For example:
4753 -- type A is tagged null record;
4754 -- type B is new A with private;
4755 -- type C is new A with private;
4757 -- type B is new C with null record;
4758 -- type C is new B with null record;
4761 and then Etype
(Full_T
) /= T
4763 Ancestor
:= Etype
(Full_T
);
4766 if Is_Interface
(Ancestor
) and then not Exclude_Parents
then
4767 Append_Unique_Elmt
(Ancestor
, Ifaces_List
);
4771 -- Traverse the graph of ancestor interfaces
4773 if Is_Non_Empty_List
(Abstract_Interface_List
(Full_T
)) then
4774 Id
:= First
(Abstract_Interface_List
(Full_T
));
4775 while Present
(Id
) loop
4776 Iface
:= Etype
(Id
);
4778 -- Protect against wrong uses. For example:
4779 -- type I is interface;
4780 -- type O is tagged null record;
4781 -- type Wrong is new I and O with null record; -- ERROR
4783 if Is_Interface
(Iface
) then
4785 and then Etype
(T
) /= T
4786 and then Interface_Present_In_Ancestor
(Etype
(T
), Iface
)
4791 Append_Unique_Elmt
(Iface
, Ifaces_List
);
4800 -- Start of processing for Collect_Interfaces
4803 pragma Assert
(Is_Tagged_Type
(T
) or else Is_Concurrent_Type
(T
));
4804 Ifaces_List
:= New_Elmt_List
;
4806 end Collect_Interfaces
;
4808 ----------------------------------
4809 -- Collect_Interface_Components --
4810 ----------------------------------
4812 procedure Collect_Interface_Components
4813 (Tagged_Type
: Entity_Id
;
4814 Components_List
: out Elist_Id
)
4816 procedure Collect
(Typ
: Entity_Id
);
4817 -- Subsidiary subprogram used to climb to the parents
4823 procedure Collect
(Typ
: Entity_Id
) is
4824 Tag_Comp
: Entity_Id
;
4825 Parent_Typ
: Entity_Id
;
4828 -- Handle private types
4830 if Present
(Full_View
(Etype
(Typ
))) then
4831 Parent_Typ
:= Full_View
(Etype
(Typ
));
4833 Parent_Typ
:= Etype
(Typ
);
4836 if Parent_Typ
/= Typ
4838 -- Protect the frontend against wrong sources. For example:
4841 -- type A is tagged null record;
4842 -- type B is new A with private;
4843 -- type C is new A with private;
4845 -- type B is new C with null record;
4846 -- type C is new B with null record;
4849 and then Parent_Typ
/= Tagged_Type
4851 Collect
(Parent_Typ
);
4854 -- Collect the components containing tags of secondary dispatch
4857 Tag_Comp
:= Next_Tag_Component
(First_Tag_Component
(Typ
));
4858 while Present
(Tag_Comp
) loop
4859 pragma Assert
(Present
(Related_Type
(Tag_Comp
)));
4860 Append_Elmt
(Tag_Comp
, Components_List
);
4862 Tag_Comp
:= Next_Tag_Component
(Tag_Comp
);
4866 -- Start of processing for Collect_Interface_Components
4869 pragma Assert
(Ekind
(Tagged_Type
) = E_Record_Type
4870 and then Is_Tagged_Type
(Tagged_Type
));
4872 Components_List
:= New_Elmt_List
;
4873 Collect
(Tagged_Type
);
4874 end Collect_Interface_Components
;
4876 -----------------------------
4877 -- Collect_Interfaces_Info --
4878 -----------------------------
4880 procedure Collect_Interfaces_Info
4882 Ifaces_List
: out Elist_Id
;
4883 Components_List
: out Elist_Id
;
4884 Tags_List
: out Elist_Id
)
4886 Comps_List
: Elist_Id
;
4887 Comp_Elmt
: Elmt_Id
;
4888 Comp_Iface
: Entity_Id
;
4889 Iface_Elmt
: Elmt_Id
;
4892 function Search_Tag
(Iface
: Entity_Id
) return Entity_Id
;
4893 -- Search for the secondary tag associated with the interface type
4894 -- Iface that is implemented by T.
4900 function Search_Tag
(Iface
: Entity_Id
) return Entity_Id
is
4903 if not Is_CPP_Class
(T
) then
4904 ADT
:= Next_Elmt
(Next_Elmt
(First_Elmt
(Access_Disp_Table
(T
))));
4906 ADT
:= Next_Elmt
(First_Elmt
(Access_Disp_Table
(T
)));
4910 and then Is_Tag
(Node
(ADT
))
4911 and then Related_Type
(Node
(ADT
)) /= Iface
4913 -- Skip secondary dispatch table referencing thunks to user
4914 -- defined primitives covered by this interface.
4916 pragma Assert
(Has_Suffix
(Node
(ADT
), 'P'));
4919 -- Skip secondary dispatch tables of Ada types
4921 if not Is_CPP_Class
(T
) then
4923 -- Skip secondary dispatch table referencing thunks to
4924 -- predefined primitives.
4926 pragma Assert
(Has_Suffix
(Node
(ADT
), 'Y'));
4929 -- Skip secondary dispatch table referencing user-defined
4930 -- primitives covered by this interface.
4932 pragma Assert
(Has_Suffix
(Node
(ADT
), 'D'));
4935 -- Skip secondary dispatch table referencing predefined
4938 pragma Assert
(Has_Suffix
(Node
(ADT
), 'Z'));
4943 pragma Assert
(Is_Tag
(Node
(ADT
)));
4947 -- Start of processing for Collect_Interfaces_Info
4950 Collect_Interfaces
(T
, Ifaces_List
);
4951 Collect_Interface_Components
(T
, Comps_List
);
4953 -- Search for the record component and tag associated with each
4954 -- interface type of T.
4956 Components_List
:= New_Elmt_List
;
4957 Tags_List
:= New_Elmt_List
;
4959 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
4960 while Present
(Iface_Elmt
) loop
4961 Iface
:= Node
(Iface_Elmt
);
4963 -- Associate the primary tag component and the primary dispatch table
4964 -- with all the interfaces that are parents of T
4966 if Is_Ancestor
(Iface
, T
, Use_Full_View
=> True) then
4967 Append_Elmt
(First_Tag_Component
(T
), Components_List
);
4968 Append_Elmt
(Node
(First_Elmt
(Access_Disp_Table
(T
))), Tags_List
);
4970 -- Otherwise search for the tag component and secondary dispatch
4974 Comp_Elmt
:= First_Elmt
(Comps_List
);
4975 while Present
(Comp_Elmt
) loop
4976 Comp_Iface
:= Related_Type
(Node
(Comp_Elmt
));
4978 if Comp_Iface
= Iface
4979 or else Is_Ancestor
(Iface
, Comp_Iface
, Use_Full_View
=> True)
4981 Append_Elmt
(Node
(Comp_Elmt
), Components_List
);
4982 Append_Elmt
(Search_Tag
(Comp_Iface
), Tags_List
);
4986 Next_Elmt
(Comp_Elmt
);
4988 pragma Assert
(Present
(Comp_Elmt
));
4991 Next_Elmt
(Iface_Elmt
);
4993 end Collect_Interfaces_Info
;
4995 ---------------------
4996 -- Collect_Parents --
4997 ---------------------
4999 procedure Collect_Parents
5001 List
: out Elist_Id
;
5002 Use_Full_View
: Boolean := True)
5004 Current_Typ
: Entity_Id
:= T
;
5005 Parent_Typ
: Entity_Id
;
5008 List
:= New_Elmt_List
;
5010 -- No action if the if the type has no parents
5012 if T
= Etype
(T
) then
5017 Parent_Typ
:= Etype
(Current_Typ
);
5019 if Is_Private_Type
(Parent_Typ
)
5020 and then Present
(Full_View
(Parent_Typ
))
5021 and then Use_Full_View
5023 Parent_Typ
:= Full_View
(Base_Type
(Parent_Typ
));
5026 Append_Elmt
(Parent_Typ
, List
);
5028 exit when Parent_Typ
= Current_Typ
;
5029 Current_Typ
:= Parent_Typ
;
5031 end Collect_Parents
;
5033 ----------------------------------
5034 -- Collect_Primitive_Operations --
5035 ----------------------------------
5037 function Collect_Primitive_Operations
(T
: Entity_Id
) return Elist_Id
is
5038 B_Type
: constant Entity_Id
:= Base_Type
(T
);
5039 B_Decl
: constant Node_Id
:= Original_Node
(Parent
(B_Type
));
5040 B_Scope
: Entity_Id
:= Scope
(B_Type
);
5044 Is_Type_In_Pkg
: Boolean;
5045 Formal_Derived
: Boolean := False;
5048 function Match
(E
: Entity_Id
) return Boolean;
5049 -- True if E's base type is B_Type, or E is of an anonymous access type
5050 -- and the base type of its designated type is B_Type.
5056 function Match
(E
: Entity_Id
) return Boolean is
5057 Etyp
: Entity_Id
:= Etype
(E
);
5060 if Ekind
(Etyp
) = E_Anonymous_Access_Type
then
5061 Etyp
:= Designated_Type
(Etyp
);
5064 -- In Ada 2012 a primitive operation may have a formal of an
5065 -- incomplete view of the parent type.
5067 return Base_Type
(Etyp
) = B_Type
5069 (Ada_Version
>= Ada_2012
5070 and then Ekind
(Etyp
) = E_Incomplete_Type
5071 and then Full_View
(Etyp
) = B_Type
);
5074 -- Start of processing for Collect_Primitive_Operations
5077 -- For tagged types, the primitive operations are collected as they
5078 -- are declared, and held in an explicit list which is simply returned.
5080 if Is_Tagged_Type
(B_Type
) then
5081 return Primitive_Operations
(B_Type
);
5083 -- An untagged generic type that is a derived type inherits the
5084 -- primitive operations of its parent type. Other formal types only
5085 -- have predefined operators, which are not explicitly represented.
5087 elsif Is_Generic_Type
(B_Type
) then
5088 if Nkind
(B_Decl
) = N_Formal_Type_Declaration
5089 and then Nkind
(Formal_Type_Definition
(B_Decl
)) =
5090 N_Formal_Derived_Type_Definition
5092 Formal_Derived
:= True;
5094 return New_Elmt_List
;
5098 Op_List
:= New_Elmt_List
;
5100 if B_Scope
= Standard_Standard
then
5101 if B_Type
= Standard_String
then
5102 Append_Elmt
(Standard_Op_Concat
, Op_List
);
5104 elsif B_Type
= Standard_Wide_String
then
5105 Append_Elmt
(Standard_Op_Concatw
, Op_List
);
5111 -- Locate the primitive subprograms of the type
5114 -- The primitive operations appear after the base type, except
5115 -- if the derivation happens within the private part of B_Scope
5116 -- and the type is a private type, in which case both the type
5117 -- and some primitive operations may appear before the base
5118 -- type, and the list of candidates starts after the type.
5120 if In_Open_Scopes
(B_Scope
)
5121 and then Scope
(T
) = B_Scope
5122 and then In_Private_Part
(B_Scope
)
5124 Id
:= Next_Entity
(T
);
5126 -- In Ada 2012, If the type has an incomplete partial view, there
5127 -- may be primitive operations declared before the full view, so
5128 -- we need to start scanning from the incomplete view, which is
5129 -- earlier on the entity chain.
5131 elsif Nkind
(Parent
(B_Type
)) = N_Full_Type_Declaration
5132 and then Present
(Incomplete_View
(Parent
(B_Type
)))
5134 Id
:= Defining_Entity
(Incomplete_View
(Parent
(B_Type
)));
5136 -- If T is a derived from a type with an incomplete view declared
5137 -- elsewhere, that incomplete view is irrelevant, we want the
5138 -- operations in the scope of T.
5140 if Scope
(Id
) /= Scope
(B_Type
) then
5141 Id
:= Next_Entity
(B_Type
);
5145 Id
:= Next_Entity
(B_Type
);
5148 -- Set flag if this is a type in a package spec
5151 Is_Package_Or_Generic_Package
(B_Scope
)
5153 Nkind
(Parent
(Declaration_Node
(First_Subtype
(T
)))) /=
5156 while Present
(Id
) loop
5158 -- Test whether the result type or any of the parameter types of
5159 -- each subprogram following the type match that type when the
5160 -- type is declared in a package spec, is a derived type, or the
5161 -- subprogram is marked as primitive. (The Is_Primitive test is
5162 -- needed to find primitives of nonderived types in declarative
5163 -- parts that happen to override the predefined "=" operator.)
5165 -- Note that generic formal subprograms are not considered to be
5166 -- primitive operations and thus are never inherited.
5168 if Is_Overloadable
(Id
)
5169 and then (Is_Type_In_Pkg
5170 or else Is_Derived_Type
(B_Type
)
5171 or else Is_Primitive
(Id
))
5172 and then Nkind
(Parent
(Parent
(Id
)))
5173 not in N_Formal_Subprogram_Declaration
5181 Formal
:= First_Formal
(Id
);
5182 while Present
(Formal
) loop
5183 if Match
(Formal
) then
5188 Next_Formal
(Formal
);
5192 -- For a formal derived type, the only primitives are the ones
5193 -- inherited from the parent type. Operations appearing in the
5194 -- package declaration are not primitive for it.
5197 and then (not Formal_Derived
or else Present
(Alias
(Id
)))
5199 -- In the special case of an equality operator aliased to
5200 -- an overriding dispatching equality belonging to the same
5201 -- type, we don't include it in the list of primitives.
5202 -- This avoids inheriting multiple equality operators when
5203 -- deriving from untagged private types whose full type is
5204 -- tagged, which can otherwise cause ambiguities. Note that
5205 -- this should only happen for this kind of untagged parent
5206 -- type, since normally dispatching operations are inherited
5207 -- using the type's Primitive_Operations list.
5209 if Chars
(Id
) = Name_Op_Eq
5210 and then Is_Dispatching_Operation
(Id
)
5211 and then Present
(Alias
(Id
))
5212 and then Present
(Overridden_Operation
(Alias
(Id
)))
5213 and then Base_Type
(Etype
(First_Entity
(Id
))) =
5214 Base_Type
(Etype
(First_Entity
(Alias
(Id
))))
5218 -- Include the subprogram in the list of primitives
5221 Append_Elmt
(Id
, Op_List
);
5228 -- For a type declared in System, some of its operations may
5229 -- appear in the target-specific extension to System.
5232 and then B_Scope
= RTU_Entity
(System
)
5233 and then Present_System_Aux
5235 B_Scope
:= System_Aux_Id
;
5236 Id
:= First_Entity
(System_Aux_Id
);
5242 end Collect_Primitive_Operations
;
5244 -----------------------------------
5245 -- Compile_Time_Constraint_Error --
5246 -----------------------------------
5248 function Compile_Time_Constraint_Error
5251 Ent
: Entity_Id
:= Empty
;
5252 Loc
: Source_Ptr
:= No_Location
;
5253 Warn
: Boolean := False) return Node_Id
5255 Msgc
: String (1 .. Msg
'Length + 3);
5256 -- Copy of message, with room for possible ?? or << and ! at end
5262 -- Start of processing for Compile_Time_Constraint_Error
5265 -- If this is a warning, convert it into an error if we are in code
5266 -- subject to SPARK_Mode being set On, unless Warn is True to force a
5267 -- warning. The rationale is that a compile-time constraint error should
5268 -- lead to an error instead of a warning when SPARK_Mode is On, but in
5269 -- a few cases we prefer to issue a warning and generate both a suitable
5270 -- run-time error in GNAT and a suitable check message in GNATprove.
5271 -- Those cases are those that likely correspond to deactivated SPARK
5272 -- code, so that this kind of code can be compiled and analyzed instead
5273 -- of being rejected.
5275 Error_Msg_Warn
:= Warn
or SPARK_Mode
/= On
;
5277 -- A static constraint error in an instance body is not a fatal error.
5278 -- we choose to inhibit the message altogether, because there is no
5279 -- obvious node (for now) on which to post it. On the other hand the
5280 -- offending node must be replaced with a constraint_error in any case.
5282 -- No messages are generated if we already posted an error on this node
5284 if not Error_Posted
(N
) then
5285 if Loc
/= No_Location
then
5291 -- Copy message to Msgc, converting any ? in the message into <
5292 -- instead, so that we have an error in GNATprove mode.
5296 for J
in 1 .. Msgl
loop
5297 if Msg
(J
) = '?' and then (J
= 1 or else Msg
(J
- 1) /= ''') then
5300 Msgc
(J
) := Msg
(J
);
5304 -- Message is a warning, even in Ada 95 case
5306 if Msg
(Msg
'Last) = '?' or else Msg
(Msg
'Last) = '<' then
5309 -- In Ada 83, all messages are warnings. In the private part and the
5310 -- body of an instance, constraint_checks are only warnings. We also
5311 -- make this a warning if the Warn parameter is set.
5314 or else (Ada_Version
= Ada_83
and then Comes_From_Source
(N
))
5315 or else In_Instance_Not_Visible
5323 -- Otherwise we have a real error message (Ada 95 static case) and we
5324 -- make this an unconditional message. Note that in the warning case
5325 -- we do not make the message unconditional, it seems reasonable to
5326 -- delete messages like this (about exceptions that will be raised)
5335 -- One more test, skip the warning if the related expression is
5336 -- statically unevaluated, since we don't want to warn about what
5337 -- will happen when something is evaluated if it never will be
5340 if not Is_Statically_Unevaluated
(N
) then
5341 if Present
(Ent
) then
5342 Error_Msg_NEL
(Msgc
(1 .. Msgl
), N
, Ent
, Eloc
);
5344 Error_Msg_NEL
(Msgc
(1 .. Msgl
), N
, Etype
(N
), Eloc
);
5349 -- Check whether the context is an Init_Proc
5351 if Inside_Init_Proc
then
5353 Conc_Typ
: constant Entity_Id
:=
5354 Corresponding_Concurrent_Type
5355 (Entity
(Parameter_Type
(First
5356 (Parameter_Specifications
5357 (Parent
(Current_Scope
))))));
5360 -- Don't complain if the corresponding concurrent type
5361 -- doesn't come from source (i.e. a single task/protected
5364 if Present
(Conc_Typ
)
5365 and then not Comes_From_Source
(Conc_Typ
)
5368 ("\& [<<", N
, Standard_Constraint_Error
, Eloc
);
5371 if GNATprove_Mode
then
5373 ("\& would have been raised for objects of this "
5374 & "type", N
, Standard_Constraint_Error
, Eloc
);
5377 ("\& will be raised for objects of this type??",
5378 N
, Standard_Constraint_Error
, Eloc
);
5384 Error_Msg_NEL
("\& [<<", N
, Standard_Constraint_Error
, Eloc
);
5388 Error_Msg
("\static expression fails Constraint_Check", Eloc
);
5389 Set_Error_Posted
(N
);
5395 end Compile_Time_Constraint_Error
;
5397 -----------------------
5398 -- Conditional_Delay --
5399 -----------------------
5401 procedure Conditional_Delay
(New_Ent
, Old_Ent
: Entity_Id
) is
5403 if Has_Delayed_Freeze
(Old_Ent
) and then not Is_Frozen
(Old_Ent
) then
5404 Set_Has_Delayed_Freeze
(New_Ent
);
5406 end Conditional_Delay
;
5408 -------------------------
5409 -- Copy_Component_List --
5410 -------------------------
5412 function Copy_Component_List
5414 Loc
: Source_Ptr
) return List_Id
5417 Comps
: constant List_Id
:= New_List
;
5420 Comp
:= First_Component
(Underlying_Type
(R_Typ
));
5421 while Present
(Comp
) loop
5422 if Comes_From_Source
(Comp
) then
5424 Comp_Decl
: constant Node_Id
:= Declaration_Node
(Comp
);
5427 Make_Component_Declaration
(Loc
,
5428 Defining_Identifier
=>
5429 Make_Defining_Identifier
(Loc
, Chars
(Comp
)),
5430 Component_Definition
=>
5432 (Component_Definition
(Comp_Decl
), New_Sloc
=> Loc
)));
5436 Next_Component
(Comp
);
5440 end Copy_Component_List
;
5442 -------------------------
5443 -- Copy_Parameter_List --
5444 -------------------------
5446 function Copy_Parameter_List
(Subp_Id
: Entity_Id
) return List_Id
is
5447 Loc
: constant Source_Ptr
:= Sloc
(Subp_Id
);
5452 if No
(First_Formal
(Subp_Id
)) then
5456 Formal
:= First_Formal
(Subp_Id
);
5457 while Present
(Formal
) loop
5459 Make_Parameter_Specification
(Loc
,
5460 Defining_Identifier
=>
5461 Make_Defining_Identifier
(Sloc
(Formal
), Chars
(Formal
)),
5462 In_Present
=> In_Present
(Parent
(Formal
)),
5463 Out_Present
=> Out_Present
(Parent
(Formal
)),
5465 New_Occurrence_Of
(Etype
(Formal
), Loc
),
5467 New_Copy_Tree
(Expression
(Parent
(Formal
)))));
5469 Next_Formal
(Formal
);
5474 end Copy_Parameter_List
;
5476 ----------------------------
5477 -- Copy_SPARK_Mode_Aspect --
5478 ----------------------------
5480 procedure Copy_SPARK_Mode_Aspect
(From
: Node_Id
; To
: Node_Id
) is
5481 pragma Assert
(not Has_Aspects
(To
));
5485 if Has_Aspects
(From
) then
5486 Asp
:= Find_Aspect
(Defining_Entity
(From
), Aspect_SPARK_Mode
);
5488 if Present
(Asp
) then
5489 Set_Aspect_Specifications
(To
, New_List
(New_Copy_Tree
(Asp
)));
5490 Set_Has_Aspects
(To
, True);
5493 end Copy_SPARK_Mode_Aspect
;
5495 --------------------------
5496 -- Copy_Subprogram_Spec --
5497 --------------------------
5499 function Copy_Subprogram_Spec
(Spec
: Node_Id
) return Node_Id
is
5501 Formal_Spec
: Node_Id
;
5505 -- The structure of the original tree must be replicated without any
5506 -- alterations. Use New_Copy_Tree for this purpose.
5508 Result
:= New_Copy_Tree
(Spec
);
5510 -- However, the spec of a null procedure carries the corresponding null
5511 -- statement of the body (created by the parser), and this cannot be
5512 -- shared with the new subprogram spec.
5514 if Nkind
(Result
) = N_Procedure_Specification
then
5515 Set_Null_Statement
(Result
, Empty
);
5518 -- Create a new entity for the defining unit name
5520 Def_Id
:= Defining_Unit_Name
(Result
);
5521 Set_Defining_Unit_Name
(Result
,
5522 Make_Defining_Identifier
(Sloc
(Def_Id
), Chars
(Def_Id
)));
5524 -- Create new entities for the formal parameters
5526 if Present
(Parameter_Specifications
(Result
)) then
5527 Formal_Spec
:= First
(Parameter_Specifications
(Result
));
5528 while Present
(Formal_Spec
) loop
5529 Def_Id
:= Defining_Identifier
(Formal_Spec
);
5530 Set_Defining_Identifier
(Formal_Spec
,
5531 Make_Defining_Identifier
(Sloc
(Def_Id
), Chars
(Def_Id
)));
5538 end Copy_Subprogram_Spec
;
5540 --------------------------------
5541 -- Corresponding_Generic_Type --
5542 --------------------------------
5544 function Corresponding_Generic_Type
(T
: Entity_Id
) return Entity_Id
is
5550 if not Is_Generic_Actual_Type
(T
) then
5553 -- If the actual is the actual of an enclosing instance, resolution
5554 -- was correct in the generic.
5556 elsif Nkind
(Parent
(T
)) = N_Subtype_Declaration
5557 and then Is_Entity_Name
(Subtype_Indication
(Parent
(T
)))
5559 Is_Generic_Actual_Type
(Entity
(Subtype_Indication
(Parent
(T
))))
5566 if Is_Wrapper_Package
(Inst
) then
5567 Inst
:= Related_Instance
(Inst
);
5572 (Specification
(Unit_Declaration_Node
(Inst
)));
5574 -- Generic actual has the same name as the corresponding formal
5576 Typ
:= First_Entity
(Gen
);
5577 while Present
(Typ
) loop
5578 if Chars
(Typ
) = Chars
(T
) then
5587 end Corresponding_Generic_Type
;
5589 --------------------
5590 -- Current_Entity --
5591 --------------------
5593 -- The currently visible definition for a given identifier is the
5594 -- one most chained at the start of the visibility chain, i.e. the
5595 -- one that is referenced by the Node_Id value of the name of the
5596 -- given identifier.
5598 function Current_Entity
(N
: Node_Id
) return Entity_Id
is
5600 return Get_Name_Entity_Id
(Chars
(N
));
5603 -----------------------------
5604 -- Current_Entity_In_Scope --
5605 -----------------------------
5607 function Current_Entity_In_Scope
(N
: Node_Id
) return Entity_Id
is
5609 CS
: constant Entity_Id
:= Current_Scope
;
5611 Transient_Case
: constant Boolean := Scope_Is_Transient
;
5614 E
:= Get_Name_Entity_Id
(Chars
(N
));
5616 and then Scope
(E
) /= CS
5617 and then (not Transient_Case
or else Scope
(E
) /= Scope
(CS
))
5623 end Current_Entity_In_Scope
;
5629 function Current_Scope
return Entity_Id
is
5631 if Scope_Stack
.Last
= -1 then
5632 return Standard_Standard
;
5635 C
: constant Entity_Id
:=
5636 Scope_Stack
.Table
(Scope_Stack
.Last
).Entity
;
5641 return Standard_Standard
;
5647 ----------------------------
5648 -- Current_Scope_No_Loops --
5649 ----------------------------
5651 function Current_Scope_No_Loops
return Entity_Id
is
5655 -- Examine the scope stack starting from the current scope and skip any
5656 -- internally generated loops.
5659 while Present
(S
) and then S
/= Standard_Standard
loop
5660 if Ekind
(S
) = E_Loop
and then not Comes_From_Source
(S
) then
5668 end Current_Scope_No_Loops
;
5670 ------------------------
5671 -- Current_Subprogram --
5672 ------------------------
5674 function Current_Subprogram
return Entity_Id
is
5675 Scop
: constant Entity_Id
:= Current_Scope
;
5677 if Is_Subprogram_Or_Generic_Subprogram
(Scop
) then
5680 return Enclosing_Subprogram
(Scop
);
5682 end Current_Subprogram
;
5684 ----------------------------------
5685 -- Deepest_Type_Access_Level --
5686 ----------------------------------
5688 function Deepest_Type_Access_Level
(Typ
: Entity_Id
) return Uint
is
5690 if Ekind
(Typ
) = E_Anonymous_Access_Type
5691 and then not Is_Local_Anonymous_Access
(Typ
)
5692 and then Nkind
(Associated_Node_For_Itype
(Typ
)) = N_Object_Declaration
5694 -- Typ is the type of an Ada 2012 stand-alone object of an anonymous
5698 Scope_Depth
(Enclosing_Dynamic_Scope
5699 (Defining_Identifier
5700 (Associated_Node_For_Itype
(Typ
))));
5702 -- For generic formal type, return Int'Last (infinite).
5703 -- See comment preceding Is_Generic_Type call in Type_Access_Level.
5705 elsif Is_Generic_Type
(Root_Type
(Typ
)) then
5706 return UI_From_Int
(Int
'Last);
5709 return Type_Access_Level
(Typ
);
5711 end Deepest_Type_Access_Level
;
5713 ---------------------
5714 -- Defining_Entity --
5715 ---------------------
5717 function Defining_Entity
5719 Empty_On_Errors
: Boolean := False;
5720 Concurrent_Subunit
: Boolean := False) return Entity_Id
5724 when N_Abstract_Subprogram_Declaration
5725 | N_Expression_Function
5726 | N_Formal_Subprogram_Declaration
5727 | N_Generic_Package_Declaration
5728 | N_Generic_Subprogram_Declaration
5729 | N_Package_Declaration
5731 | N_Subprogram_Body_Stub
5732 | N_Subprogram_Declaration
5733 | N_Subprogram_Renaming_Declaration
5735 return Defining_Entity
(Specification
(N
));
5737 when N_Component_Declaration
5738 | N_Defining_Program_Unit_Name
5739 | N_Discriminant_Specification
5741 | N_Entry_Declaration
5742 | N_Entry_Index_Specification
5743 | N_Exception_Declaration
5744 | N_Exception_Renaming_Declaration
5745 | N_Formal_Object_Declaration
5746 | N_Formal_Package_Declaration
5747 | N_Formal_Type_Declaration
5748 | N_Full_Type_Declaration
5749 | N_Implicit_Label_Declaration
5750 | N_Incomplete_Type_Declaration
5751 | N_Iterator_Specification
5752 | N_Loop_Parameter_Specification
5753 | N_Number_Declaration
5754 | N_Object_Declaration
5755 | N_Object_Renaming_Declaration
5756 | N_Package_Body_Stub
5757 | N_Parameter_Specification
5758 | N_Private_Extension_Declaration
5759 | N_Private_Type_Declaration
5761 | N_Protected_Body_Stub
5762 | N_Protected_Type_Declaration
5763 | N_Single_Protected_Declaration
5764 | N_Single_Task_Declaration
5765 | N_Subtype_Declaration
5768 | N_Task_Type_Declaration
5770 return Defining_Identifier
(N
);
5774 Bod
: constant Node_Id
:= Proper_Body
(N
);
5775 Orig_Bod
: constant Node_Id
:= Original_Node
(Bod
);
5778 -- Retrieve the entity of the original protected or task body
5779 -- if requested by the caller.
5781 if Concurrent_Subunit
5782 and then Nkind
(Bod
) = N_Null_Statement
5783 and then Nkind_In
(Orig_Bod
, N_Protected_Body
, N_Task_Body
)
5785 return Defining_Entity
(Orig_Bod
);
5787 return Defining_Entity
(Bod
);
5791 when N_Function_Instantiation
5792 | N_Function_Specification
5793 | N_Generic_Function_Renaming_Declaration
5794 | N_Generic_Package_Renaming_Declaration
5795 | N_Generic_Procedure_Renaming_Declaration
5797 | N_Package_Instantiation
5798 | N_Package_Renaming_Declaration
5799 | N_Package_Specification
5800 | N_Procedure_Instantiation
5801 | N_Procedure_Specification
5804 Nam
: constant Node_Id
:= Defining_Unit_Name
(N
);
5805 Err
: Entity_Id
:= Empty
;
5808 if Nkind
(Nam
) in N_Entity
then
5811 -- For Error, make up a name and attach to declaration so we
5812 -- can continue semantic analysis.
5814 elsif Nam
= Error
then
5815 if Empty_On_Errors
then
5818 Err
:= Make_Temporary
(Sloc
(N
), 'T');
5819 Set_Defining_Unit_Name
(N
, Err
);
5824 -- If not an entity, get defining identifier
5827 return Defining_Identifier
(Nam
);
5831 when N_Block_Statement
5834 return Entity
(Identifier
(N
));
5837 if Empty_On_Errors
then
5840 raise Program_Error
;
5843 end Defining_Entity
;
5845 --------------------------
5846 -- Denotes_Discriminant --
5847 --------------------------
5849 function Denotes_Discriminant
5851 Check_Concurrent
: Boolean := False) return Boolean
5856 if not Is_Entity_Name
(N
) or else No
(Entity
(N
)) then
5862 -- If we are checking for a protected type, the discriminant may have
5863 -- been rewritten as the corresponding discriminal of the original type
5864 -- or of the corresponding concurrent record, depending on whether we
5865 -- are in the spec or body of the protected type.
5867 return Ekind
(E
) = E_Discriminant
5870 and then Ekind
(E
) = E_In_Parameter
5871 and then Present
(Discriminal_Link
(E
))
5873 (Is_Concurrent_Type
(Scope
(Discriminal_Link
(E
)))
5875 Is_Concurrent_Record_Type
(Scope
(Discriminal_Link
(E
)))));
5876 end Denotes_Discriminant
;
5878 -------------------------
5879 -- Denotes_Same_Object --
5880 -------------------------
5882 function Denotes_Same_Object
(A1
, A2
: Node_Id
) return Boolean is
5883 Obj1
: Node_Id
:= A1
;
5884 Obj2
: Node_Id
:= A2
;
5886 function Has_Prefix
(N
: Node_Id
) return Boolean;
5887 -- Return True if N has attribute Prefix
5889 function Is_Renaming
(N
: Node_Id
) return Boolean;
5890 -- Return true if N names a renaming entity
5892 function Is_Valid_Renaming
(N
: Node_Id
) return Boolean;
5893 -- For renamings, return False if the prefix of any dereference within
5894 -- the renamed object_name is a variable, or any expression within the
5895 -- renamed object_name contains references to variables or calls on
5896 -- nonstatic functions; otherwise return True (RM 6.4.1(6.10/3))
5902 function Has_Prefix
(N
: Node_Id
) return Boolean is
5906 N_Attribute_Reference
,
5908 N_Explicit_Dereference
,
5909 N_Indexed_Component
,
5911 N_Selected_Component
,
5919 function Is_Renaming
(N
: Node_Id
) return Boolean is
5921 return Is_Entity_Name
(N
)
5922 and then Present
(Renamed_Entity
(Entity
(N
)));
5925 -----------------------
5926 -- Is_Valid_Renaming --
5927 -----------------------
5929 function Is_Valid_Renaming
(N
: Node_Id
) return Boolean is
5931 function Check_Renaming
(N
: Node_Id
) return Boolean;
5932 -- Recursive function used to traverse all the prefixes of N
5934 function Check_Renaming
(N
: Node_Id
) return Boolean is
5937 and then not Check_Renaming
(Renamed_Entity
(Entity
(N
)))
5942 if Nkind
(N
) = N_Indexed_Component
then
5947 Indx
:= First
(Expressions
(N
));
5948 while Present
(Indx
) loop
5949 if not Is_OK_Static_Expression
(Indx
) then
5958 if Has_Prefix
(N
) then
5960 P
: constant Node_Id
:= Prefix
(N
);
5963 if Nkind
(N
) = N_Explicit_Dereference
5964 and then Is_Variable
(P
)
5968 elsif Is_Entity_Name
(P
)
5969 and then Ekind
(Entity
(P
)) = E_Function
5973 elsif Nkind
(P
) = N_Function_Call
then
5977 -- Recursion to continue traversing the prefix of the
5978 -- renaming expression
5980 return Check_Renaming
(P
);
5987 -- Start of processing for Is_Valid_Renaming
5990 return Check_Renaming
(N
);
5991 end Is_Valid_Renaming
;
5993 -- Start of processing for Denotes_Same_Object
5996 -- Both names statically denote the same stand-alone object or parameter
5997 -- (RM 6.4.1(6.5/3))
5999 if Is_Entity_Name
(Obj1
)
6000 and then Is_Entity_Name
(Obj2
)
6001 and then Entity
(Obj1
) = Entity
(Obj2
)
6006 -- For renamings, the prefix of any dereference within the renamed
6007 -- object_name is not a variable, and any expression within the
6008 -- renamed object_name contains no references to variables nor
6009 -- calls on nonstatic functions (RM 6.4.1(6.10/3)).
6011 if Is_Renaming
(Obj1
) then
6012 if Is_Valid_Renaming
(Obj1
) then
6013 Obj1
:= Renamed_Entity
(Entity
(Obj1
));
6019 if Is_Renaming
(Obj2
) then
6020 if Is_Valid_Renaming
(Obj2
) then
6021 Obj2
:= Renamed_Entity
(Entity
(Obj2
));
6027 -- No match if not same node kind (such cases are handled by
6028 -- Denotes_Same_Prefix)
6030 if Nkind
(Obj1
) /= Nkind
(Obj2
) then
6033 -- After handling valid renamings, one of the two names statically
6034 -- denoted a renaming declaration whose renamed object_name is known
6035 -- to denote the same object as the other (RM 6.4.1(6.10/3))
6037 elsif Is_Entity_Name
(Obj1
) then
6038 if Is_Entity_Name
(Obj2
) then
6039 return Entity
(Obj1
) = Entity
(Obj2
);
6044 -- Both names are selected_components, their prefixes are known to
6045 -- denote the same object, and their selector_names denote the same
6046 -- component (RM 6.4.1(6.6/3)).
6048 elsif Nkind
(Obj1
) = N_Selected_Component
then
6049 return Denotes_Same_Object
(Prefix
(Obj1
), Prefix
(Obj2
))
6051 Entity
(Selector_Name
(Obj1
)) = Entity
(Selector_Name
(Obj2
));
6053 -- Both names are dereferences and the dereferenced names are known to
6054 -- denote the same object (RM 6.4.1(6.7/3))
6056 elsif Nkind
(Obj1
) = N_Explicit_Dereference
then
6057 return Denotes_Same_Object
(Prefix
(Obj1
), Prefix
(Obj2
));
6059 -- Both names are indexed_components, their prefixes are known to denote
6060 -- the same object, and each of the pairs of corresponding index values
6061 -- are either both static expressions with the same static value or both
6062 -- names that are known to denote the same object (RM 6.4.1(6.8/3))
6064 elsif Nkind
(Obj1
) = N_Indexed_Component
then
6065 if not Denotes_Same_Object
(Prefix
(Obj1
), Prefix
(Obj2
)) then
6073 Indx1
:= First
(Expressions
(Obj1
));
6074 Indx2
:= First
(Expressions
(Obj2
));
6075 while Present
(Indx1
) loop
6077 -- Indexes must denote the same static value or same object
6079 if Is_OK_Static_Expression
(Indx1
) then
6080 if not Is_OK_Static_Expression
(Indx2
) then
6083 elsif Expr_Value
(Indx1
) /= Expr_Value
(Indx2
) then
6087 elsif not Denotes_Same_Object
(Indx1
, Indx2
) then
6099 -- Both names are slices, their prefixes are known to denote the same
6100 -- object, and the two slices have statically matching index constraints
6101 -- (RM 6.4.1(6.9/3))
6103 elsif Nkind
(Obj1
) = N_Slice
6104 and then Denotes_Same_Object
(Prefix
(Obj1
), Prefix
(Obj2
))
6107 Lo1
, Lo2
, Hi1
, Hi2
: Node_Id
;
6110 Get_Index_Bounds
(Etype
(Obj1
), Lo1
, Hi1
);
6111 Get_Index_Bounds
(Etype
(Obj2
), Lo2
, Hi2
);
6113 -- Check whether bounds are statically identical. There is no
6114 -- attempt to detect partial overlap of slices.
6116 return Denotes_Same_Object
(Lo1
, Lo2
)
6118 Denotes_Same_Object
(Hi1
, Hi2
);
6121 -- In the recursion, literals appear as indexes
6123 elsif Nkind
(Obj1
) = N_Integer_Literal
6125 Nkind
(Obj2
) = N_Integer_Literal
6127 return Intval
(Obj1
) = Intval
(Obj2
);
6132 end Denotes_Same_Object
;
6134 -------------------------
6135 -- Denotes_Same_Prefix --
6136 -------------------------
6138 function Denotes_Same_Prefix
(A1
, A2
: Node_Id
) return Boolean is
6140 if Is_Entity_Name
(A1
) then
6141 if Nkind_In
(A2
, N_Selected_Component
, N_Indexed_Component
)
6142 and then not Is_Access_Type
(Etype
(A1
))
6144 return Denotes_Same_Object
(A1
, Prefix
(A2
))
6145 or else Denotes_Same_Prefix
(A1
, Prefix
(A2
));
6150 elsif Is_Entity_Name
(A2
) then
6151 return Denotes_Same_Prefix
(A1
=> A2
, A2
=> A1
);
6153 elsif Nkind_In
(A1
, N_Selected_Component
, N_Indexed_Component
, N_Slice
)
6155 Nkind_In
(A2
, N_Selected_Component
, N_Indexed_Component
, N_Slice
)
6158 Root1
, Root2
: Node_Id
;
6159 Depth1
, Depth2
: Nat
:= 0;
6162 Root1
:= Prefix
(A1
);
6163 while not Is_Entity_Name
(Root1
) loop
6165 (Root1
, N_Selected_Component
, N_Indexed_Component
)
6169 Root1
:= Prefix
(Root1
);
6172 Depth1
:= Depth1
+ 1;
6175 Root2
:= Prefix
(A2
);
6176 while not Is_Entity_Name
(Root2
) loop
6177 if not Nkind_In
(Root2
, N_Selected_Component
,
6178 N_Indexed_Component
)
6182 Root2
:= Prefix
(Root2
);
6185 Depth2
:= Depth2
+ 1;
6188 -- If both have the same depth and they do not denote the same
6189 -- object, they are disjoint and no warning is needed.
6191 if Depth1
= Depth2
then
6194 elsif Depth1
> Depth2
then
6195 Root1
:= Prefix
(A1
);
6196 for J
in 1 .. Depth1
- Depth2
- 1 loop
6197 Root1
:= Prefix
(Root1
);
6200 return Denotes_Same_Object
(Root1
, A2
);
6203 Root2
:= Prefix
(A2
);
6204 for J
in 1 .. Depth2
- Depth1
- 1 loop
6205 Root2
:= Prefix
(Root2
);
6208 return Denotes_Same_Object
(A1
, Root2
);
6215 end Denotes_Same_Prefix
;
6217 ----------------------
6218 -- Denotes_Variable --
6219 ----------------------
6221 function Denotes_Variable
(N
: Node_Id
) return Boolean is
6223 return Is_Variable
(N
) and then Paren_Count
(N
) = 0;
6224 end Denotes_Variable
;
6226 -----------------------------
6227 -- Depends_On_Discriminant --
6228 -----------------------------
6230 function Depends_On_Discriminant
(N
: Node_Id
) return Boolean is
6235 Get_Index_Bounds
(N
, L
, H
);
6236 return Denotes_Discriminant
(L
) or else Denotes_Discriminant
(H
);
6237 end Depends_On_Discriminant
;
6239 -------------------------
6240 -- Designate_Same_Unit --
6241 -------------------------
6243 function Designate_Same_Unit
6245 Name2
: Node_Id
) return Boolean
6247 K1
: constant Node_Kind
:= Nkind
(Name1
);
6248 K2
: constant Node_Kind
:= Nkind
(Name2
);
6250 function Prefix_Node
(N
: Node_Id
) return Node_Id
;
6251 -- Returns the parent unit name node of a defining program unit name
6252 -- or the prefix if N is a selected component or an expanded name.
6254 function Select_Node
(N
: Node_Id
) return Node_Id
;
6255 -- Returns the defining identifier node of a defining program unit
6256 -- name or the selector node if N is a selected component or an
6263 function Prefix_Node
(N
: Node_Id
) return Node_Id
is
6265 if Nkind
(N
) = N_Defining_Program_Unit_Name
then
6276 function Select_Node
(N
: Node_Id
) return Node_Id
is
6278 if Nkind
(N
) = N_Defining_Program_Unit_Name
then
6279 return Defining_Identifier
(N
);
6281 return Selector_Name
(N
);
6285 -- Start of processing for Designate_Same_Unit
6288 if Nkind_In
(K1
, N_Identifier
, N_Defining_Identifier
)
6290 Nkind_In
(K2
, N_Identifier
, N_Defining_Identifier
)
6292 return Chars
(Name1
) = Chars
(Name2
);
6294 elsif Nkind_In
(K1
, N_Expanded_Name
,
6295 N_Selected_Component
,
6296 N_Defining_Program_Unit_Name
)
6298 Nkind_In
(K2
, N_Expanded_Name
,
6299 N_Selected_Component
,
6300 N_Defining_Program_Unit_Name
)
6303 (Chars
(Select_Node
(Name1
)) = Chars
(Select_Node
(Name2
)))
6305 Designate_Same_Unit
(Prefix_Node
(Name1
), Prefix_Node
(Name2
));
6310 end Designate_Same_Unit
;
6312 ---------------------------------------------
6313 -- Diagnose_Iterated_Component_Association --
6314 ---------------------------------------------
6316 procedure Diagnose_Iterated_Component_Association
(N
: Node_Id
) is
6317 Def_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
6321 -- Determine whether the iterated component association appears within
6322 -- an aggregate. If this is the case, raise Program_Error because the
6323 -- iterated component association cannot be left in the tree as is and
6324 -- must always be processed by the related aggregate.
6327 while Present
(Aggr
) loop
6328 if Nkind
(Aggr
) = N_Aggregate
then
6329 raise Program_Error
;
6331 -- Prevent the search from going too far
6333 elsif Is_Body_Or_Package_Declaration
(Aggr
) then
6337 Aggr
:= Parent
(Aggr
);
6340 -- At this point it is known that the iterated component association is
6341 -- not within an aggregate. This is really a quantified expression with
6342 -- a missing "all" or "some" quantifier.
6344 Error_Msg_N
("missing quantifier", Def_Id
);
6346 -- Rewrite the iterated component association as True to prevent any
6349 Rewrite
(N
, New_Occurrence_Of
(Standard_True
, Sloc
(N
)));
6351 end Diagnose_Iterated_Component_Association
;
6353 ---------------------------------
6354 -- Dynamic_Accessibility_Level --
6355 ---------------------------------
6357 function Dynamic_Accessibility_Level
(Expr
: Node_Id
) return Node_Id
is
6358 Loc
: constant Source_Ptr
:= Sloc
(Expr
);
6360 function Make_Level_Literal
(Level
: Uint
) return Node_Id
;
6361 -- Construct an integer literal representing an accessibility level
6362 -- with its type set to Natural.
6364 ------------------------
6365 -- Make_Level_Literal --
6366 ------------------------
6368 function Make_Level_Literal
(Level
: Uint
) return Node_Id
is
6369 Result
: constant Node_Id
:= Make_Integer_Literal
(Loc
, Level
);
6372 Set_Etype
(Result
, Standard_Natural
);
6374 end Make_Level_Literal
;
6380 -- Start of processing for Dynamic_Accessibility_Level
6383 if Is_Entity_Name
(Expr
) then
6386 if Present
(Renamed_Object
(E
)) then
6387 return Dynamic_Accessibility_Level
(Renamed_Object
(E
));
6390 if Is_Formal
(E
) or else Ekind_In
(E
, E_Variable
, E_Constant
) then
6391 if Present
(Extra_Accessibility
(E
)) then
6392 return New_Occurrence_Of
(Extra_Accessibility
(E
), Loc
);
6397 -- Unimplemented: Ptr.all'Access, where Ptr has Extra_Accessibility ???
6399 case Nkind
(Expr
) is
6401 -- For access discriminant, the level of the enclosing object
6403 when N_Selected_Component
=>
6404 if Ekind
(Entity
(Selector_Name
(Expr
))) = E_Discriminant
6405 and then Ekind
(Etype
(Entity
(Selector_Name
(Expr
)))) =
6406 E_Anonymous_Access_Type
6408 return Make_Level_Literal
(Object_Access_Level
(Expr
));
6411 when N_Attribute_Reference
=>
6412 case Get_Attribute_Id
(Attribute_Name
(Expr
)) is
6414 -- For X'Access, the level of the prefix X
6416 when Attribute_Access
=>
6417 return Make_Level_Literal
6418 (Object_Access_Level
(Prefix
(Expr
)));
6420 -- Treat the unchecked attributes as library-level
6422 when Attribute_Unchecked_Access
6423 | Attribute_Unrestricted_Access
6425 return Make_Level_Literal
(Scope_Depth
(Standard_Standard
));
6427 -- No other access-valued attributes
6430 raise Program_Error
;
6435 -- Unimplemented: depends on context. As an actual parameter where
6436 -- formal type is anonymous, use
6437 -- Scope_Depth (Current_Scope) + 1.
6438 -- For other cases, see 3.10.2(14/3) and following. ???
6442 when N_Type_Conversion
=>
6443 if not Is_Local_Anonymous_Access
(Etype
(Expr
)) then
6445 -- Handle type conversions introduced for a rename of an
6446 -- Ada 2012 stand-alone object of an anonymous access type.
6448 return Dynamic_Accessibility_Level
(Expression
(Expr
));
6455 return Make_Level_Literal
(Type_Access_Level
(Etype
(Expr
)));
6456 end Dynamic_Accessibility_Level
;
6458 ------------------------
6459 -- Discriminated_Size --
6460 ------------------------
6462 function Discriminated_Size
(Comp
: Entity_Id
) return Boolean is
6463 function Non_Static_Bound
(Bound
: Node_Id
) return Boolean;
6464 -- Check whether the bound of an index is non-static and does denote
6465 -- a discriminant, in which case any object of the type (protected or
6466 -- otherwise) will have a non-static size.
6468 ----------------------
6469 -- Non_Static_Bound --
6470 ----------------------
6472 function Non_Static_Bound
(Bound
: Node_Id
) return Boolean is
6474 if Is_OK_Static_Expression
(Bound
) then
6477 -- If the bound is given by a discriminant it is non-static
6478 -- (A static constraint replaces the reference with the value).
6479 -- In an protected object the discriminant has been replaced by
6480 -- the corresponding discriminal within the protected operation.
6482 elsif Is_Entity_Name
(Bound
)
6484 (Ekind
(Entity
(Bound
)) = E_Discriminant
6485 or else Present
(Discriminal_Link
(Entity
(Bound
))))
6492 end Non_Static_Bound
;
6496 Typ
: constant Entity_Id
:= Etype
(Comp
);
6499 -- Start of processing for Discriminated_Size
6502 if not Is_Array_Type
(Typ
) then
6506 if Ekind
(Typ
) = E_Array_Subtype
then
6507 Index
:= First_Index
(Typ
);
6508 while Present
(Index
) loop
6509 if Non_Static_Bound
(Low_Bound
(Index
))
6510 or else Non_Static_Bound
(High_Bound
(Index
))
6522 end Discriminated_Size
;
6524 -----------------------------------
6525 -- Effective_Extra_Accessibility --
6526 -----------------------------------
6528 function Effective_Extra_Accessibility
(Id
: Entity_Id
) return Entity_Id
is
6530 if Present
(Renamed_Object
(Id
))
6531 and then Is_Entity_Name
(Renamed_Object
(Id
))
6533 return Effective_Extra_Accessibility
(Entity
(Renamed_Object
(Id
)));
6535 return Extra_Accessibility
(Id
);
6537 end Effective_Extra_Accessibility
;
6539 -----------------------------
6540 -- Effective_Reads_Enabled --
6541 -----------------------------
6543 function Effective_Reads_Enabled
(Id
: Entity_Id
) return Boolean is
6545 return Has_Enabled_Property
(Id
, Name_Effective_Reads
);
6546 end Effective_Reads_Enabled
;
6548 ------------------------------
6549 -- Effective_Writes_Enabled --
6550 ------------------------------
6552 function Effective_Writes_Enabled
(Id
: Entity_Id
) return Boolean is
6554 return Has_Enabled_Property
(Id
, Name_Effective_Writes
);
6555 end Effective_Writes_Enabled
;
6557 ------------------------------
6558 -- Enclosing_Comp_Unit_Node --
6559 ------------------------------
6561 function Enclosing_Comp_Unit_Node
(N
: Node_Id
) return Node_Id
is
6562 Current_Node
: Node_Id
;
6566 while Present
(Current_Node
)
6567 and then Nkind
(Current_Node
) /= N_Compilation_Unit
6569 Current_Node
:= Parent
(Current_Node
);
6572 if Nkind
(Current_Node
) /= N_Compilation_Unit
then
6575 return Current_Node
;
6577 end Enclosing_Comp_Unit_Node
;
6579 --------------------------
6580 -- Enclosing_CPP_Parent --
6581 --------------------------
6583 function Enclosing_CPP_Parent
(Typ
: Entity_Id
) return Entity_Id
is
6584 Parent_Typ
: Entity_Id
:= Typ
;
6587 while not Is_CPP_Class
(Parent_Typ
)
6588 and then Etype
(Parent_Typ
) /= Parent_Typ
6590 Parent_Typ
:= Etype
(Parent_Typ
);
6592 if Is_Private_Type
(Parent_Typ
) then
6593 Parent_Typ
:= Full_View
(Base_Type
(Parent_Typ
));
6597 pragma Assert
(Is_CPP_Class
(Parent_Typ
));
6599 end Enclosing_CPP_Parent
;
6601 ---------------------------
6602 -- Enclosing_Declaration --
6603 ---------------------------
6605 function Enclosing_Declaration
(N
: Node_Id
) return Node_Id
is
6606 Decl
: Node_Id
:= N
;
6609 while Present
(Decl
)
6610 and then not (Nkind
(Decl
) in N_Declaration
6612 Nkind
(Decl
) in N_Later_Decl_Item
)
6614 Decl
:= Parent
(Decl
);
6618 end Enclosing_Declaration
;
6620 ----------------------------
6621 -- Enclosing_Generic_Body --
6622 ----------------------------
6624 function Enclosing_Generic_Body
6625 (N
: Node_Id
) return Node_Id
6633 while Present
(P
) loop
6634 if Nkind
(P
) = N_Package_Body
6635 or else Nkind
(P
) = N_Subprogram_Body
6637 Spec
:= Corresponding_Spec
(P
);
6639 if Present
(Spec
) then
6640 Decl
:= Unit_Declaration_Node
(Spec
);
6642 if Nkind
(Decl
) = N_Generic_Package_Declaration
6643 or else Nkind
(Decl
) = N_Generic_Subprogram_Declaration
6654 end Enclosing_Generic_Body
;
6656 ----------------------------
6657 -- Enclosing_Generic_Unit --
6658 ----------------------------
6660 function Enclosing_Generic_Unit
6661 (N
: Node_Id
) return Node_Id
6669 while Present
(P
) loop
6670 if Nkind
(P
) = N_Generic_Package_Declaration
6671 or else Nkind
(P
) = N_Generic_Subprogram_Declaration
6675 elsif Nkind
(P
) = N_Package_Body
6676 or else Nkind
(P
) = N_Subprogram_Body
6678 Spec
:= Corresponding_Spec
(P
);
6680 if Present
(Spec
) then
6681 Decl
:= Unit_Declaration_Node
(Spec
);
6683 if Nkind
(Decl
) = N_Generic_Package_Declaration
6684 or else Nkind
(Decl
) = N_Generic_Subprogram_Declaration
6695 end Enclosing_Generic_Unit
;
6697 -------------------------------
6698 -- Enclosing_Lib_Unit_Entity --
6699 -------------------------------
6701 function Enclosing_Lib_Unit_Entity
6702 (E
: Entity_Id
:= Current_Scope
) return Entity_Id
6704 Unit_Entity
: Entity_Id
;
6707 -- Look for enclosing library unit entity by following scope links.
6708 -- Equivalent to, but faster than indexing through the scope stack.
6711 while (Present
(Scope
(Unit_Entity
))
6712 and then Scope
(Unit_Entity
) /= Standard_Standard
)
6713 and not Is_Child_Unit
(Unit_Entity
)
6715 Unit_Entity
:= Scope
(Unit_Entity
);
6719 end Enclosing_Lib_Unit_Entity
;
6721 -----------------------------
6722 -- Enclosing_Lib_Unit_Node --
6723 -----------------------------
6725 function Enclosing_Lib_Unit_Node
(N
: Node_Id
) return Node_Id
is
6726 Encl_Unit
: Node_Id
;
6729 Encl_Unit
:= Enclosing_Comp_Unit_Node
(N
);
6730 while Present
(Encl_Unit
)
6731 and then Nkind
(Unit
(Encl_Unit
)) = N_Subunit
6733 Encl_Unit
:= Library_Unit
(Encl_Unit
);
6736 pragma Assert
(Nkind
(Encl_Unit
) = N_Compilation_Unit
);
6738 end Enclosing_Lib_Unit_Node
;
6740 -----------------------
6741 -- Enclosing_Package --
6742 -----------------------
6744 function Enclosing_Package
(E
: Entity_Id
) return Entity_Id
is
6745 Dynamic_Scope
: constant Entity_Id
:= Enclosing_Dynamic_Scope
(E
);
6748 if Dynamic_Scope
= Standard_Standard
then
6749 return Standard_Standard
;
6751 elsif Dynamic_Scope
= Empty
then
6754 elsif Ekind_In
(Dynamic_Scope
, E_Package
, E_Package_Body
,
6757 return Dynamic_Scope
;
6760 return Enclosing_Package
(Dynamic_Scope
);
6762 end Enclosing_Package
;
6764 -------------------------------------
6765 -- Enclosing_Package_Or_Subprogram --
6766 -------------------------------------
6768 function Enclosing_Package_Or_Subprogram
(E
: Entity_Id
) return Entity_Id
is
6773 while Present
(S
) loop
6774 if Is_Package_Or_Generic_Package
(S
)
6775 or else Ekind
(S
) = E_Package_Body
6779 elsif Is_Subprogram_Or_Generic_Subprogram
(S
)
6780 or else Ekind
(S
) = E_Subprogram_Body
6790 end Enclosing_Package_Or_Subprogram
;
6792 --------------------------
6793 -- Enclosing_Subprogram --
6794 --------------------------
6796 function Enclosing_Subprogram
(E
: Entity_Id
) return Entity_Id
is
6797 Dynamic_Scope
: constant Entity_Id
:= Enclosing_Dynamic_Scope
(E
);
6800 if Dynamic_Scope
= Standard_Standard
then
6803 elsif Dynamic_Scope
= Empty
then
6806 elsif Ekind
(Dynamic_Scope
) = E_Subprogram_Body
then
6807 return Corresponding_Spec
(Parent
(Parent
(Dynamic_Scope
)));
6809 elsif Ekind
(Dynamic_Scope
) = E_Block
6810 or else Ekind
(Dynamic_Scope
) = E_Return_Statement
6812 return Enclosing_Subprogram
(Dynamic_Scope
);
6814 elsif Ekind
(Dynamic_Scope
) = E_Task_Type
then
6815 return Get_Task_Body_Procedure
(Dynamic_Scope
);
6817 elsif Ekind
(Dynamic_Scope
) = E_Limited_Private_Type
6818 and then Present
(Full_View
(Dynamic_Scope
))
6819 and then Ekind
(Full_View
(Dynamic_Scope
)) = E_Task_Type
6821 return Get_Task_Body_Procedure
(Full_View
(Dynamic_Scope
));
6823 -- No body is generated if the protected operation is eliminated
6825 elsif Convention
(Dynamic_Scope
) = Convention_Protected
6826 and then not Is_Eliminated
(Dynamic_Scope
)
6827 and then Present
(Protected_Body_Subprogram
(Dynamic_Scope
))
6829 return Protected_Body_Subprogram
(Dynamic_Scope
);
6832 return Dynamic_Scope
;
6834 end Enclosing_Subprogram
;
6836 --------------------------
6837 -- End_Keyword_Location --
6838 --------------------------
6840 function End_Keyword_Location
(N
: Node_Id
) return Source_Ptr
is
6841 function End_Label_Loc
(Nod
: Node_Id
) return Source_Ptr
;
6842 -- Return the source location of Nod's end label according to the
6843 -- following precedence rules:
6845 -- 1) If the end label exists, return its location
6846 -- 2) If Nod exists, return its location
6847 -- 3) Return the location of N
6853 function End_Label_Loc
(Nod
: Node_Id
) return Source_Ptr
is
6857 if Present
(Nod
) then
6858 Label
:= End_Label
(Nod
);
6860 if Present
(Label
) then
6861 return Sloc
(Label
);
6875 -- Start of processing for End_Keyword_Location
6878 if Nkind_In
(N
, N_Block_Statement
,
6884 Owner
:= Handled_Statement_Sequence
(N
);
6886 elsif Nkind
(N
) = N_Package_Declaration
then
6887 Owner
:= Specification
(N
);
6889 elsif Nkind
(N
) = N_Protected_Body
then
6892 elsif Nkind_In
(N
, N_Protected_Type_Declaration
,
6893 N_Single_Protected_Declaration
)
6895 Owner
:= Protected_Definition
(N
);
6897 elsif Nkind_In
(N
, N_Single_Task_Declaration
,
6898 N_Task_Type_Declaration
)
6900 Owner
:= Task_Definition
(N
);
6902 -- This routine should not be called with other contexts
6905 pragma Assert
(False);
6909 return End_Label_Loc
(Owner
);
6910 end End_Keyword_Location
;
6912 ------------------------
6913 -- Ensure_Freeze_Node --
6914 ------------------------
6916 procedure Ensure_Freeze_Node
(E
: Entity_Id
) is
6919 if No
(Freeze_Node
(E
)) then
6920 FN
:= Make_Freeze_Entity
(Sloc
(E
));
6921 Set_Has_Delayed_Freeze
(E
);
6922 Set_Freeze_Node
(E
, FN
);
6923 Set_Access_Types_To_Process
(FN
, No_Elist
);
6924 Set_TSS_Elist
(FN
, No_Elist
);
6927 end Ensure_Freeze_Node
;
6933 procedure Enter_Name
(Def_Id
: Entity_Id
) is
6934 C
: constant Entity_Id
:= Current_Entity
(Def_Id
);
6935 E
: constant Entity_Id
:= Current_Entity_In_Scope
(Def_Id
);
6936 S
: constant Entity_Id
:= Current_Scope
;
6939 Generate_Definition
(Def_Id
);
6941 -- Add new name to current scope declarations. Check for duplicate
6942 -- declaration, which may or may not be a genuine error.
6946 -- Case of previous entity entered because of a missing declaration
6947 -- or else a bad subtype indication. Best is to use the new entity,
6948 -- and make the previous one invisible.
6950 if Etype
(E
) = Any_Type
then
6951 Set_Is_Immediately_Visible
(E
, False);
6953 -- Case of renaming declaration constructed for package instances.
6954 -- if there is an explicit declaration with the same identifier,
6955 -- the renaming is not immediately visible any longer, but remains
6956 -- visible through selected component notation.
6958 elsif Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
6959 and then not Comes_From_Source
(E
)
6961 Set_Is_Immediately_Visible
(E
, False);
6963 -- The new entity may be the package renaming, which has the same
6964 -- same name as a generic formal which has been seen already.
6966 elsif Nkind
(Parent
(Def_Id
)) = N_Package_Renaming_Declaration
6967 and then not Comes_From_Source
(Def_Id
)
6969 Set_Is_Immediately_Visible
(E
, False);
6971 -- For a fat pointer corresponding to a remote access to subprogram,
6972 -- we use the same identifier as the RAS type, so that the proper
6973 -- name appears in the stub. This type is only retrieved through
6974 -- the RAS type and never by visibility, and is not added to the
6975 -- visibility list (see below).
6977 elsif Nkind
(Parent
(Def_Id
)) = N_Full_Type_Declaration
6978 and then Ekind
(Def_Id
) = E_Record_Type
6979 and then Present
(Corresponding_Remote_Type
(Def_Id
))
6983 -- Case of an implicit operation or derived literal. The new entity
6984 -- hides the implicit one, which is removed from all visibility,
6985 -- i.e. the entity list of its scope, and homonym chain of its name.
6987 elsif (Is_Overloadable
(E
) and then Is_Inherited_Operation
(E
))
6988 or else Is_Internal
(E
)
6991 Decl
: constant Node_Id
:= Parent
(E
);
6993 Prev_Vis
: Entity_Id
;
6996 -- If E is an implicit declaration, it cannot be the first
6997 -- entity in the scope.
6999 Prev
:= First_Entity
(Current_Scope
);
7000 while Present
(Prev
) and then Next_Entity
(Prev
) /= E
loop
7006 -- If E is not on the entity chain of the current scope,
7007 -- it is an implicit declaration in the generic formal
7008 -- part of a generic subprogram. When analyzing the body,
7009 -- the generic formals are visible but not on the entity
7010 -- chain of the subprogram. The new entity will become
7011 -- the visible one in the body.
7014 (Nkind
(Parent
(Decl
)) = N_Generic_Subprogram_Declaration
);
7018 Set_Next_Entity
(Prev
, Next_Entity
(E
));
7020 if No
(Next_Entity
(Prev
)) then
7021 Set_Last_Entity
(Current_Scope
, Prev
);
7024 if E
= Current_Entity
(E
) then
7028 Prev_Vis
:= Current_Entity
(E
);
7029 while Homonym
(Prev_Vis
) /= E
loop
7030 Prev_Vis
:= Homonym
(Prev_Vis
);
7034 if Present
(Prev_Vis
) then
7036 -- Skip E in the visibility chain
7038 Set_Homonym
(Prev_Vis
, Homonym
(E
));
7041 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
7046 -- This section of code could use a comment ???
7048 elsif Present
(Etype
(E
))
7049 and then Is_Concurrent_Type
(Etype
(E
))
7054 -- If the homograph is a protected component renaming, it should not
7055 -- be hiding the current entity. Such renamings are treated as weak
7058 elsif Is_Prival
(E
) then
7059 Set_Is_Immediately_Visible
(E
, False);
7061 -- In this case the current entity is a protected component renaming.
7062 -- Perform minimal decoration by setting the scope and return since
7063 -- the prival should not be hiding other visible entities.
7065 elsif Is_Prival
(Def_Id
) then
7066 Set_Scope
(Def_Id
, Current_Scope
);
7069 -- Analogous to privals, the discriminal generated for an entry index
7070 -- parameter acts as a weak declaration. Perform minimal decoration
7071 -- to avoid bogus errors.
7073 elsif Is_Discriminal
(Def_Id
)
7074 and then Ekind
(Discriminal_Link
(Def_Id
)) = E_Entry_Index_Parameter
7076 Set_Scope
(Def_Id
, Current_Scope
);
7079 -- In the body or private part of an instance, a type extension may
7080 -- introduce a component with the same name as that of an actual. The
7081 -- legality rule is not enforced, but the semantics of the full type
7082 -- with two components of same name are not clear at this point???
7084 elsif In_Instance_Not_Visible
then
7087 -- When compiling a package body, some child units may have become
7088 -- visible. They cannot conflict with local entities that hide them.
7090 elsif Is_Child_Unit
(E
)
7091 and then In_Open_Scopes
(Scope
(E
))
7092 and then not Is_Immediately_Visible
(E
)
7096 -- Conversely, with front-end inlining we may compile the parent body
7097 -- first, and a child unit subsequently. The context is now the
7098 -- parent spec, and body entities are not visible.
7100 elsif Is_Child_Unit
(Def_Id
)
7101 and then Is_Package_Body_Entity
(E
)
7102 and then not In_Package_Body
(Current_Scope
)
7106 -- Case of genuine duplicate declaration
7109 Error_Msg_Sloc
:= Sloc
(E
);
7111 -- If the previous declaration is an incomplete type declaration
7112 -- this may be an attempt to complete it with a private type. The
7113 -- following avoids confusing cascaded errors.
7115 if Nkind
(Parent
(E
)) = N_Incomplete_Type_Declaration
7116 and then Nkind
(Parent
(Def_Id
)) = N_Private_Type_Declaration
7119 ("incomplete type cannot be completed with a private " &
7120 "declaration", Parent
(Def_Id
));
7121 Set_Is_Immediately_Visible
(E
, False);
7122 Set_Full_View
(E
, Def_Id
);
7124 -- An inherited component of a record conflicts with a new
7125 -- discriminant. The discriminant is inserted first in the scope,
7126 -- but the error should be posted on it, not on the component.
7128 elsif Ekind
(E
) = E_Discriminant
7129 and then Present
(Scope
(Def_Id
))
7130 and then Scope
(Def_Id
) /= Current_Scope
7132 Error_Msg_Sloc
:= Sloc
(Def_Id
);
7133 Error_Msg_N
("& conflicts with declaration#", E
);
7136 -- If the name of the unit appears in its own context clause, a
7137 -- dummy package with the name has already been created, and the
7138 -- error emitted. Try to continue quietly.
7140 elsif Error_Posted
(E
)
7141 and then Sloc
(E
) = No_Location
7142 and then Nkind
(Parent
(E
)) = N_Package_Specification
7143 and then Current_Scope
= Standard_Standard
7145 Set_Scope
(Def_Id
, Current_Scope
);
7149 Error_Msg_N
("& conflicts with declaration#", Def_Id
);
7151 -- Avoid cascaded messages with duplicate components in
7154 if Ekind_In
(E
, E_Component
, E_Discriminant
) then
7159 if Nkind
(Parent
(Parent
(Def_Id
))) =
7160 N_Generic_Subprogram_Declaration
7162 Defining_Entity
(Specification
(Parent
(Parent
(Def_Id
))))
7164 Error_Msg_N
("\generic units cannot be overloaded", Def_Id
);
7167 -- If entity is in standard, then we are in trouble, because it
7168 -- means that we have a library package with a duplicated name.
7169 -- That's hard to recover from, so abort.
7171 if S
= Standard_Standard
then
7172 raise Unrecoverable_Error
;
7174 -- Otherwise we continue with the declaration. Having two
7175 -- identical declarations should not cause us too much trouble.
7183 -- If we fall through, declaration is OK, at least OK enough to continue
7185 -- If Def_Id is a discriminant or a record component we are in the midst
7186 -- of inheriting components in a derived record definition. Preserve
7187 -- their Ekind and Etype.
7189 if Ekind_In
(Def_Id
, E_Discriminant
, E_Component
) then
7192 -- If a type is already set, leave it alone (happens when a type
7193 -- declaration is reanalyzed following a call to the optimizer).
7195 elsif Present
(Etype
(Def_Id
)) then
7198 -- Otherwise, the kind E_Void insures that premature uses of the entity
7199 -- will be detected. Any_Type insures that no cascaded errors will occur
7202 Set_Ekind
(Def_Id
, E_Void
);
7203 Set_Etype
(Def_Id
, Any_Type
);
7206 -- Inherited discriminants and components in derived record types are
7207 -- immediately visible. Itypes are not.
7209 -- Unless the Itype is for a record type with a corresponding remote
7210 -- type (what is that about, it was not commented ???)
7212 if Ekind_In
(Def_Id
, E_Discriminant
, E_Component
)
7214 ((not Is_Record_Type
(Def_Id
)
7215 or else No
(Corresponding_Remote_Type
(Def_Id
)))
7216 and then not Is_Itype
(Def_Id
))
7218 Set_Is_Immediately_Visible
(Def_Id
);
7219 Set_Current_Entity
(Def_Id
);
7222 Set_Homonym
(Def_Id
, C
);
7223 Append_Entity
(Def_Id
, S
);
7224 Set_Public_Status
(Def_Id
);
7226 -- Declaring a homonym is not allowed in SPARK ...
7228 if Present
(C
) and then Restriction_Check_Required
(SPARK_05
) then
7230 Enclosing_Subp
: constant Node_Id
:= Enclosing_Subprogram
(Def_Id
);
7231 Enclosing_Pack
: constant Node_Id
:= Enclosing_Package
(Def_Id
);
7232 Other_Scope
: constant Node_Id
:= Enclosing_Dynamic_Scope
(C
);
7235 -- ... unless the new declaration is in a subprogram, and the
7236 -- visible declaration is a variable declaration or a parameter
7237 -- specification outside that subprogram.
7239 if Present
(Enclosing_Subp
)
7240 and then Nkind_In
(Parent
(C
), N_Object_Declaration
,
7241 N_Parameter_Specification
)
7242 and then not Scope_Within_Or_Same
(Other_Scope
, Enclosing_Subp
)
7246 -- ... or the new declaration is in a package, and the visible
7247 -- declaration occurs outside that package.
7249 elsif Present
(Enclosing_Pack
)
7250 and then not Scope_Within_Or_Same
(Other_Scope
, Enclosing_Pack
)
7254 -- ... or the new declaration is a component declaration in a
7255 -- record type definition.
7257 elsif Nkind
(Parent
(Def_Id
)) = N_Component_Declaration
then
7260 -- Don't issue error for non-source entities
7262 elsif Comes_From_Source
(Def_Id
)
7263 and then Comes_From_Source
(C
)
7265 Error_Msg_Sloc
:= Sloc
(C
);
7266 Check_SPARK_05_Restriction
7267 ("redeclaration of identifier &#", Def_Id
);
7272 -- Warn if new entity hides an old one
7274 if Warn_On_Hiding
and then Present
(C
)
7276 -- Don't warn for record components since they always have a well
7277 -- defined scope which does not confuse other uses. Note that in
7278 -- some cases, Ekind has not been set yet.
7280 and then Ekind
(C
) /= E_Component
7281 and then Ekind
(C
) /= E_Discriminant
7282 and then Nkind
(Parent
(C
)) /= N_Component_Declaration
7283 and then Ekind
(Def_Id
) /= E_Component
7284 and then Ekind
(Def_Id
) /= E_Discriminant
7285 and then Nkind
(Parent
(Def_Id
)) /= N_Component_Declaration
7287 -- Don't warn for one character variables. It is too common to use
7288 -- such variables as locals and will just cause too many false hits.
7290 and then Length_Of_Name
(Chars
(C
)) /= 1
7292 -- Don't warn for non-source entities
7294 and then Comes_From_Source
(C
)
7295 and then Comes_From_Source
(Def_Id
)
7297 -- Don't warn unless entity in question is in extended main source
7299 and then In_Extended_Main_Source_Unit
(Def_Id
)
7301 -- Finally, the hidden entity must be either immediately visible or
7302 -- use visible (i.e. from a used package).
7305 (Is_Immediately_Visible
(C
)
7307 Is_Potentially_Use_Visible
(C
))
7309 Error_Msg_Sloc
:= Sloc
(C
);
7310 Error_Msg_N
("declaration hides &#?h?", Def_Id
);
7318 function Entity_Of
(N
: Node_Id
) return Entity_Id
is
7323 -- Assume that the arbitrary node does not have an entity
7327 if Is_Entity_Name
(N
) then
7330 -- Follow a possible chain of renamings to reach the earliest renamed
7334 and then Is_Object
(Id
)
7335 and then Present
(Renamed_Object
(Id
))
7337 Ren
:= Renamed_Object
(Id
);
7339 -- The reference renames an abstract state or a whole object
7342 -- Ren : ... renames Obj;
7344 if Is_Entity_Name
(Ren
) then
7347 -- The reference renames a function result. Check the original
7348 -- node in case expansion relocates the function call.
7350 -- Ren : ... renames Func_Call;
7352 elsif Nkind
(Original_Node
(Ren
)) = N_Function_Call
then
7355 -- Otherwise the reference renames something which does not yield
7356 -- an abstract state or a whole object. Treat the reference as not
7357 -- having a proper entity for SPARK legality purposes.
7369 --------------------------
7370 -- Explain_Limited_Type --
7371 --------------------------
7373 procedure Explain_Limited_Type
(T
: Entity_Id
; N
: Node_Id
) is
7377 -- For array, component type must be limited
7379 if Is_Array_Type
(T
) then
7380 Error_Msg_Node_2
:= T
;
7382 ("\component type& of type& is limited", N
, Component_Type
(T
));
7383 Explain_Limited_Type
(Component_Type
(T
), N
);
7385 elsif Is_Record_Type
(T
) then
7387 -- No need for extra messages if explicit limited record
7389 if Is_Limited_Record
(Base_Type
(T
)) then
7393 -- Otherwise find a limited component. Check only components that
7394 -- come from source, or inherited components that appear in the
7395 -- source of the ancestor.
7397 C
:= First_Component
(T
);
7398 while Present
(C
) loop
7399 if Is_Limited_Type
(Etype
(C
))
7401 (Comes_From_Source
(C
)
7403 (Present
(Original_Record_Component
(C
))
7405 Comes_From_Source
(Original_Record_Component
(C
))))
7407 Error_Msg_Node_2
:= T
;
7408 Error_Msg_NE
("\component& of type& has limited type", N
, C
);
7409 Explain_Limited_Type
(Etype
(C
), N
);
7416 -- The type may be declared explicitly limited, even if no component
7417 -- of it is limited, in which case we fall out of the loop.
7420 end Explain_Limited_Type
;
7422 ---------------------------------------
7423 -- Expression_Of_Expression_Function --
7424 ---------------------------------------
7426 function Expression_Of_Expression_Function
7427 (Subp
: Entity_Id
) return Node_Id
7429 Expr_Func
: Node_Id
;
7432 pragma Assert
(Is_Expression_Function_Or_Completion
(Subp
));
7434 if Nkind
(Original_Node
(Subprogram_Spec
(Subp
))) =
7435 N_Expression_Function
7437 Expr_Func
:= Original_Node
(Subprogram_Spec
(Subp
));
7439 elsif Nkind
(Original_Node
(Subprogram_Body
(Subp
))) =
7440 N_Expression_Function
7442 Expr_Func
:= Original_Node
(Subprogram_Body
(Subp
));
7445 pragma Assert
(False);
7449 return Original_Node
(Expression
(Expr_Func
));
7450 end Expression_Of_Expression_Function
;
7452 -------------------------------
7453 -- Extensions_Visible_Status --
7454 -------------------------------
7456 function Extensions_Visible_Status
7457 (Id
: Entity_Id
) return Extensions_Visible_Mode
7466 -- When a formal parameter is subject to Extensions_Visible, the pragma
7467 -- is stored in the contract of related subprogram.
7469 if Is_Formal
(Id
) then
7472 elsif Is_Subprogram_Or_Generic_Subprogram
(Id
) then
7475 -- No other construct carries this pragma
7478 return Extensions_Visible_None
;
7481 Prag
:= Get_Pragma
(Subp
, Pragma_Extensions_Visible
);
7483 -- In certain cases analysis may request the Extensions_Visible status
7484 -- of an expression function before the pragma has been analyzed yet.
7485 -- Inspect the declarative items after the expression function looking
7486 -- for the pragma (if any).
7488 if No
(Prag
) and then Is_Expression_Function
(Subp
) then
7489 Decl
:= Next
(Unit_Declaration_Node
(Subp
));
7490 while Present
(Decl
) loop
7491 if Nkind
(Decl
) = N_Pragma
7492 and then Pragma_Name
(Decl
) = Name_Extensions_Visible
7497 -- A source construct ends the region where Extensions_Visible may
7498 -- appear, stop the traversal. An expanded expression function is
7499 -- no longer a source construct, but it must still be recognized.
7501 elsif Comes_From_Source
(Decl
)
7503 (Nkind_In
(Decl
, N_Subprogram_Body
,
7504 N_Subprogram_Declaration
)
7505 and then Is_Expression_Function
(Defining_Entity
(Decl
)))
7514 -- Extract the value from the Boolean expression (if any)
7516 if Present
(Prag
) then
7517 Arg
:= First
(Pragma_Argument_Associations
(Prag
));
7519 if Present
(Arg
) then
7520 Expr
:= Get_Pragma_Arg
(Arg
);
7522 -- When the associated subprogram is an expression function, the
7523 -- argument of the pragma may not have been analyzed.
7525 if not Analyzed
(Expr
) then
7526 Preanalyze_And_Resolve
(Expr
, Standard_Boolean
);
7529 -- Guard against cascading errors when the argument of pragma
7530 -- Extensions_Visible is not a valid static Boolean expression.
7532 if Error_Posted
(Expr
) then
7533 return Extensions_Visible_None
;
7535 elsif Is_True
(Expr_Value
(Expr
)) then
7536 return Extensions_Visible_True
;
7539 return Extensions_Visible_False
;
7542 -- Otherwise the aspect or pragma defaults to True
7545 return Extensions_Visible_True
;
7548 -- Otherwise aspect or pragma Extensions_Visible is not inherited or
7549 -- directly specified. In SPARK code, its value defaults to "False".
7551 elsif SPARK_Mode
= On
then
7552 return Extensions_Visible_False
;
7554 -- In non-SPARK code, aspect or pragma Extensions_Visible defaults to
7558 return Extensions_Visible_True
;
7560 end Extensions_Visible_Status
;
7566 procedure Find_Actual
7568 Formal
: out Entity_Id
;
7571 Context
: constant Node_Id
:= Parent
(N
);
7576 if Nkind_In
(Context
, N_Indexed_Component
, N_Selected_Component
)
7577 and then N
= Prefix
(Context
)
7579 Find_Actual
(Context
, Formal
, Call
);
7582 elsif Nkind
(Context
) = N_Parameter_Association
7583 and then N
= Explicit_Actual_Parameter
(Context
)
7585 Call
:= Parent
(Context
);
7587 elsif Nkind_In
(Context
, N_Entry_Call_Statement
,
7589 N_Procedure_Call_Statement
)
7599 -- If we have a call to a subprogram look for the parameter. Note that
7600 -- we exclude overloaded calls, since we don't know enough to be sure
7601 -- of giving the right answer in this case.
7603 if Nkind_In
(Call
, N_Entry_Call_Statement
,
7605 N_Procedure_Call_Statement
)
7607 Call_Nam
:= Name
(Call
);
7609 -- A call to a protected or task entry appears as a selected
7610 -- component rather than an expanded name.
7612 if Nkind
(Call_Nam
) = N_Selected_Component
then
7613 Call_Nam
:= Selector_Name
(Call_Nam
);
7616 if Is_Entity_Name
(Call_Nam
)
7617 and then Present
(Entity
(Call_Nam
))
7618 and then Is_Overloadable
(Entity
(Call_Nam
))
7619 and then not Is_Overloaded
(Call_Nam
)
7621 -- If node is name in call it is not an actual
7623 if N
= Call_Nam
then
7629 -- Fall here if we are definitely a parameter
7631 Actual
:= First_Actual
(Call
);
7632 Formal
:= First_Formal
(Entity
(Call_Nam
));
7633 while Present
(Formal
) and then Present
(Actual
) loop
7637 -- An actual that is the prefix in a prefixed call may have
7638 -- been rewritten in the call, after the deferred reference
7639 -- was collected. Check if sloc and kinds and names match.
7641 elsif Sloc
(Actual
) = Sloc
(N
)
7642 and then Nkind
(Actual
) = N_Identifier
7643 and then Nkind
(Actual
) = Nkind
(N
)
7644 and then Chars
(Actual
) = Chars
(N
)
7649 Actual
:= Next_Actual
(Actual
);
7650 Formal
:= Next_Formal
(Formal
);
7656 -- Fall through here if we did not find matching actual
7662 ---------------------------
7663 -- Find_Body_Discriminal --
7664 ---------------------------
7666 function Find_Body_Discriminal
7667 (Spec_Discriminant
: Entity_Id
) return Entity_Id
7673 -- If expansion is suppressed, then the scope can be the concurrent type
7674 -- itself rather than a corresponding concurrent record type.
7676 if Is_Concurrent_Type
(Scope
(Spec_Discriminant
)) then
7677 Tsk
:= Scope
(Spec_Discriminant
);
7680 pragma Assert
(Is_Concurrent_Record_Type
(Scope
(Spec_Discriminant
)));
7682 Tsk
:= Corresponding_Concurrent_Type
(Scope
(Spec_Discriminant
));
7685 -- Find discriminant of original concurrent type, and use its current
7686 -- discriminal, which is the renaming within the task/protected body.
7688 Disc
:= First_Discriminant
(Tsk
);
7689 while Present
(Disc
) loop
7690 if Chars
(Disc
) = Chars
(Spec_Discriminant
) then
7691 return Discriminal
(Disc
);
7694 Next_Discriminant
(Disc
);
7697 -- That loop should always succeed in finding a matching entry and
7698 -- returning. Fatal error if not.
7700 raise Program_Error
;
7701 end Find_Body_Discriminal
;
7703 -------------------------------------
7704 -- Find_Corresponding_Discriminant --
7705 -------------------------------------
7707 function Find_Corresponding_Discriminant
7709 Typ
: Entity_Id
) return Entity_Id
7711 Par_Disc
: Entity_Id
;
7712 Old_Disc
: Entity_Id
;
7713 New_Disc
: Entity_Id
;
7716 Par_Disc
:= Original_Record_Component
(Original_Discriminant
(Id
));
7718 -- The original type may currently be private, and the discriminant
7719 -- only appear on its full view.
7721 if Is_Private_Type
(Scope
(Par_Disc
))
7722 and then not Has_Discriminants
(Scope
(Par_Disc
))
7723 and then Present
(Full_View
(Scope
(Par_Disc
)))
7725 Old_Disc
:= First_Discriminant
(Full_View
(Scope
(Par_Disc
)));
7727 Old_Disc
:= First_Discriminant
(Scope
(Par_Disc
));
7730 if Is_Class_Wide_Type
(Typ
) then
7731 New_Disc
:= First_Discriminant
(Root_Type
(Typ
));
7733 New_Disc
:= First_Discriminant
(Typ
);
7736 while Present
(Old_Disc
) and then Present
(New_Disc
) loop
7737 if Old_Disc
= Par_Disc
then
7741 Next_Discriminant
(Old_Disc
);
7742 Next_Discriminant
(New_Disc
);
7745 -- Should always find it
7747 raise Program_Error
;
7748 end Find_Corresponding_Discriminant
;
7754 function Find_DIC_Type
(Typ
: Entity_Id
) return Entity_Id
is
7755 Curr_Typ
: Entity_Id
;
7756 -- The current type being examined in the parent hierarchy traversal
7758 DIC_Typ
: Entity_Id
;
7759 -- The type which carries the DIC pragma. This variable denotes the
7760 -- partial view when private types are involved.
7762 Par_Typ
: Entity_Id
;
7763 -- The parent type of the current type. This variable denotes the full
7764 -- view when private types are involved.
7767 -- The input type defines its own DIC pragma, therefore it is the owner
7769 if Has_Own_DIC
(Typ
) then
7772 -- Otherwise the DIC pragma is inherited from a parent type
7775 pragma Assert
(Has_Inherited_DIC
(Typ
));
7777 -- Climb the parent chain
7781 -- Inspect the parent type. Do not consider subtypes as they
7782 -- inherit the DIC attributes from their base types.
7784 DIC_Typ
:= Base_Type
(Etype
(Curr_Typ
));
7786 -- Look at the full view of a private type because the type may
7787 -- have a hidden parent introduced in the full view.
7791 if Is_Private_Type
(Par_Typ
)
7792 and then Present
(Full_View
(Par_Typ
))
7794 Par_Typ
:= Full_View
(Par_Typ
);
7797 -- Stop the climb once the nearest parent type which defines a DIC
7798 -- pragma of its own is encountered or when the root of the parent
7799 -- chain is reached.
7801 exit when Has_Own_DIC
(DIC_Typ
) or else Curr_Typ
= Par_Typ
;
7803 Curr_Typ
:= Par_Typ
;
7810 ----------------------------------
7811 -- Find_Enclosing_Iterator_Loop --
7812 ----------------------------------
7814 function Find_Enclosing_Iterator_Loop
(Id
: Entity_Id
) return Entity_Id
is
7819 -- Traverse the scope chain looking for an iterator loop. Such loops are
7820 -- usually transformed into blocks, hence the use of Original_Node.
7823 while Present
(S
) and then S
/= Standard_Standard
loop
7824 if Ekind
(S
) = E_Loop
7825 and then Nkind
(Parent
(S
)) = N_Implicit_Label_Declaration
7827 Constr
:= Original_Node
(Label_Construct
(Parent
(S
)));
7829 if Nkind
(Constr
) = N_Loop_Statement
7830 and then Present
(Iteration_Scheme
(Constr
))
7831 and then Nkind
(Iterator_Specification
7832 (Iteration_Scheme
(Constr
))) =
7833 N_Iterator_Specification
7843 end Find_Enclosing_Iterator_Loop
;
7845 --------------------------
7846 -- Find_Enclosing_Scope --
7847 --------------------------
7849 function Find_Enclosing_Scope
(N
: Node_Id
) return Entity_Id
is
7851 Spec_Id
: Entity_Id
;
7854 -- Examine the parent chain looking for a construct which defines a
7858 while Present
(Par
) loop
7861 -- The construct denotes a declaration, the proper scope is its
7864 when N_Entry_Declaration
7865 | N_Expression_Function
7866 | N_Full_Type_Declaration
7867 | N_Generic_Package_Declaration
7868 | N_Generic_Subprogram_Declaration
7869 | N_Package_Declaration
7870 | N_Private_Extension_Declaration
7871 | N_Protected_Type_Declaration
7872 | N_Single_Protected_Declaration
7873 | N_Single_Task_Declaration
7874 | N_Subprogram_Declaration
7875 | N_Task_Type_Declaration
7877 return Defining_Entity
(Par
);
7879 -- The construct denotes a body, the proper scope is the entity of
7880 -- the corresponding spec.
7888 Spec_Id
:= Corresponding_Spec
(Par
);
7890 -- The defining entity of a stand-alone subprogram body defines
7893 if Nkind
(Par
) = N_Subprogram_Body
and then No
(Spec_Id
) then
7894 return Defining_Entity
(Par
);
7896 -- Otherwise there should be corresponding spec which defines a
7900 pragma Assert
(Present
(Spec_Id
));
7907 -- Blocks carry either a source or an internally-generated scope,
7908 -- unless the block is a byproduct of exception handling.
7910 when N_Block_Statement
=>
7911 if not Exception_Junk
(Par
) then
7912 return Entity
(Identifier
(Par
));
7915 -- Loops carry an internally-generated scope
7917 when N_Loop_Statement
=>
7918 return Entity
(Identifier
(Par
));
7920 -- Extended return statements carry an internally-generated scope
7922 when N_Extended_Return_Statement
=>
7923 return Return_Statement_Entity
(Par
);
7925 -- A traversal from a subunit continues via the corresponding stub
7928 Par
:= Corresponding_Stub
(Par
);
7934 Par
:= Parent
(Par
);
7937 return Standard_Standard
;
7938 end Find_Enclosing_Scope
;
7940 ------------------------------------
7941 -- Find_Loop_In_Conditional_Block --
7942 ------------------------------------
7944 function Find_Loop_In_Conditional_Block
(N
: Node_Id
) return Node_Id
is
7950 if Nkind
(Stmt
) = N_If_Statement
then
7951 Stmt
:= First
(Then_Statements
(Stmt
));
7954 pragma Assert
(Nkind
(Stmt
) = N_Block_Statement
);
7956 -- Inspect the statements of the conditional block. In general the loop
7957 -- should be the first statement in the statement sequence of the block,
7958 -- but the finalization machinery may have introduced extra object
7961 Stmt
:= First
(Statements
(Handled_Statement_Sequence
(Stmt
)));
7962 while Present
(Stmt
) loop
7963 if Nkind
(Stmt
) = N_Loop_Statement
then
7970 -- The expansion of attribute 'Loop_Entry produced a malformed block
7972 raise Program_Error
;
7973 end Find_Loop_In_Conditional_Block
;
7975 --------------------------
7976 -- Find_Overlaid_Entity --
7977 --------------------------
7979 procedure Find_Overlaid_Entity
7981 Ent
: out Entity_Id
;
7987 -- We are looking for one of the two following forms:
7989 -- for X'Address use Y'Address
7993 -- Const : constant Address := expr;
7995 -- for X'Address use Const;
7997 -- In the second case, the expr is either Y'Address, or recursively a
7998 -- constant that eventually references Y'Address.
8003 if Nkind
(N
) = N_Attribute_Definition_Clause
8004 and then Chars
(N
) = Name_Address
8006 Expr
:= Expression
(N
);
8008 -- This loop checks the form of the expression for Y'Address,
8009 -- using recursion to deal with intermediate constants.
8012 -- Check for Y'Address
8014 if Nkind
(Expr
) = N_Attribute_Reference
8015 and then Attribute_Name
(Expr
) = Name_Address
8017 Expr
:= Prefix
(Expr
);
8020 -- Check for Const where Const is a constant entity
8022 elsif Is_Entity_Name
(Expr
)
8023 and then Ekind
(Entity
(Expr
)) = E_Constant
8025 Expr
:= Constant_Value
(Entity
(Expr
));
8027 -- Anything else does not need checking
8034 -- This loop checks the form of the prefix for an entity, using
8035 -- recursion to deal with intermediate components.
8038 -- Check for Y where Y is an entity
8040 if Is_Entity_Name
(Expr
) then
8041 Ent
:= Entity
(Expr
);
8044 -- Check for components
8047 Nkind_In
(Expr
, N_Selected_Component
, N_Indexed_Component
)
8049 Expr
:= Prefix
(Expr
);
8052 -- Anything else does not need checking
8059 end Find_Overlaid_Entity
;
8061 -------------------------
8062 -- Find_Parameter_Type --
8063 -------------------------
8065 function Find_Parameter_Type
(Param
: Node_Id
) return Entity_Id
is
8067 if Nkind
(Param
) /= N_Parameter_Specification
then
8070 -- For an access parameter, obtain the type from the formal entity
8071 -- itself, because access to subprogram nodes do not carry a type.
8072 -- Shouldn't we always use the formal entity ???
8074 elsif Nkind
(Parameter_Type
(Param
)) = N_Access_Definition
then
8075 return Etype
(Defining_Identifier
(Param
));
8078 return Etype
(Parameter_Type
(Param
));
8080 end Find_Parameter_Type
;
8082 -----------------------------------
8083 -- Find_Placement_In_State_Space --
8084 -----------------------------------
8086 procedure Find_Placement_In_State_Space
8087 (Item_Id
: Entity_Id
;
8088 Placement
: out State_Space_Kind
;
8089 Pack_Id
: out Entity_Id
)
8091 Context
: Entity_Id
;
8094 -- Assume that the item does not appear in the state space of a package
8096 Placement
:= Not_In_Package
;
8099 -- Climb the scope stack and examine the enclosing context
8101 Context
:= Scope
(Item_Id
);
8102 while Present
(Context
) and then Context
/= Standard_Standard
loop
8103 if Is_Package_Or_Generic_Package
(Context
) then
8106 -- A package body is a cut off point for the traversal as the item
8107 -- cannot be visible to the outside from this point on. Note that
8108 -- this test must be done first as a body is also classified as a
8111 if In_Package_Body
(Context
) then
8112 Placement
:= Body_State_Space
;
8115 -- The private part of a package is a cut off point for the
8116 -- traversal as the item cannot be visible to the outside from
8119 elsif In_Private_Part
(Context
) then
8120 Placement
:= Private_State_Space
;
8123 -- When the item appears in the visible state space of a package,
8124 -- continue to climb the scope stack as this may not be the final
8128 Placement
:= Visible_State_Space
;
8130 -- The visible state space of a child unit acts as the proper
8131 -- placement of an item.
8133 if Is_Child_Unit
(Context
) then
8138 -- The item or its enclosing package appear in a construct that has
8142 Placement
:= Not_In_Package
;
8146 Context
:= Scope
(Context
);
8148 end Find_Placement_In_State_Space
;
8150 ------------------------
8151 -- Find_Specific_Type --
8152 ------------------------
8154 function Find_Specific_Type
(CW
: Entity_Id
) return Entity_Id
is
8155 Typ
: Entity_Id
:= Root_Type
(CW
);
8158 if Ekind
(Typ
) = E_Incomplete_Type
then
8159 if From_Limited_With
(Typ
) then
8160 Typ
:= Non_Limited_View
(Typ
);
8162 Typ
:= Full_View
(Typ
);
8166 if Is_Private_Type
(Typ
)
8167 and then not Is_Tagged_Type
(Typ
)
8168 and then Present
(Full_View
(Typ
))
8170 return Full_View
(Typ
);
8174 end Find_Specific_Type
;
8176 -----------------------------
8177 -- Find_Static_Alternative --
8178 -----------------------------
8180 function Find_Static_Alternative
(N
: Node_Id
) return Node_Id
is
8181 Expr
: constant Node_Id
:= Expression
(N
);
8182 Val
: constant Uint
:= Expr_Value
(Expr
);
8187 Alt
:= First
(Alternatives
(N
));
8190 if Nkind
(Alt
) /= N_Pragma
then
8191 Choice
:= First
(Discrete_Choices
(Alt
));
8192 while Present
(Choice
) loop
8194 -- Others choice, always matches
8196 if Nkind
(Choice
) = N_Others_Choice
then
8199 -- Range, check if value is in the range
8201 elsif Nkind
(Choice
) = N_Range
then
8203 Val
>= Expr_Value
(Low_Bound
(Choice
))
8205 Val
<= Expr_Value
(High_Bound
(Choice
));
8207 -- Choice is a subtype name. Note that we know it must
8208 -- be a static subtype, since otherwise it would have
8209 -- been diagnosed as illegal.
8211 elsif Is_Entity_Name
(Choice
)
8212 and then Is_Type
(Entity
(Choice
))
8214 exit Search
when Is_In_Range
(Expr
, Etype
(Choice
),
8215 Assume_Valid
=> False);
8217 -- Choice is a subtype indication
8219 elsif Nkind
(Choice
) = N_Subtype_Indication
then
8221 C
: constant Node_Id
:= Constraint
(Choice
);
8222 R
: constant Node_Id
:= Range_Expression
(C
);
8226 Val
>= Expr_Value
(Low_Bound
(R
))
8228 Val
<= Expr_Value
(High_Bound
(R
));
8231 -- Choice is a simple expression
8234 exit Search
when Val
= Expr_Value
(Choice
);
8242 pragma Assert
(Present
(Alt
));
8245 -- The above loop *must* terminate by finding a match, since we know the
8246 -- case statement is valid, and the value of the expression is known at
8247 -- compile time. When we fall out of the loop, Alt points to the
8248 -- alternative that we know will be selected at run time.
8251 end Find_Static_Alternative
;
8257 function First_Actual
(Node
: Node_Id
) return Node_Id
is
8261 if No
(Parameter_Associations
(Node
)) then
8265 N
:= First
(Parameter_Associations
(Node
));
8267 if Nkind
(N
) = N_Parameter_Association
then
8268 return First_Named_Actual
(Node
);
8278 function First_Global
8280 Global_Mode
: Name_Id
;
8281 Refined
: Boolean := False) return Node_Id
8283 function First_From_Global_List
8285 Global_Mode
: Name_Id
:= Name_Input
) return Entity_Id
;
8286 -- Get the first item with suitable mode from List
8288 ----------------------------
8289 -- First_From_Global_List --
8290 ----------------------------
8292 function First_From_Global_List
8294 Global_Mode
: Name_Id
:= Name_Input
) return Entity_Id
8299 -- Empty list (no global items)
8301 if Nkind
(List
) = N_Null
then
8304 -- Single global item declaration (only input items)
8306 elsif Nkind_In
(List
, N_Expanded_Name
,
8308 N_Selected_Component
)
8310 if Global_Mode
= Name_Input
then
8316 -- Simple global list (only input items) or moded global list
8319 elsif Nkind
(List
) = N_Aggregate
then
8320 if Present
(Expressions
(List
)) then
8321 if Global_Mode
= Name_Input
then
8322 return First
(Expressions
(List
));
8328 Assoc
:= First
(Component_Associations
(List
));
8329 while Present
(Assoc
) loop
8331 -- When we find the desired mode in an association, call
8332 -- recursively First_From_Global_List as if the mode was
8333 -- Name_Input, in order to reuse the existing machinery
8334 -- for the other cases.
8336 if Chars
(First
(Choices
(Assoc
))) = Global_Mode
then
8337 return First_From_Global_List
(Expression
(Assoc
));
8346 -- To accommodate partial decoration of disabled SPARK features,
8347 -- this routine may be called with illegal input. If this is the
8348 -- case, do not raise Program_Error.
8353 end First_From_Global_List
;
8357 Global
: Node_Id
:= Empty
;
8358 Body_Id
: Entity_Id
;
8361 pragma Assert
(Global_Mode
= Name_Input
8362 or else Global_Mode
= Name_Output
8363 or else Global_Mode
= Name_In_Out
8364 or else Global_Mode
= Name_Proof_In
);
8366 -- Retrieve the suitable pragma Global or Refined_Global. In the second
8367 -- case, it can only be located on the body entity.
8370 Body_Id
:= Subprogram_Body_Entity
(Subp
);
8371 if Present
(Body_Id
) then
8372 Global
:= Get_Pragma
(Body_Id
, Pragma_Refined_Global
);
8375 Global
:= Get_Pragma
(Subp
, Pragma_Global
);
8378 -- No corresponding global if pragma is not present
8383 -- Otherwise retrieve the corresponding list of items depending on the
8387 return First_From_Global_List
8388 (Expression
(Get_Argument
(Global
, Subp
)), Global_Mode
);
8396 function Fix_Msg
(Id
: Entity_Id
; Msg
: String) return String is
8397 Is_Task
: constant Boolean :=
8398 Ekind_In
(Id
, E_Task_Body
, E_Task_Type
)
8399 or else Is_Single_Task_Object
(Id
);
8400 Msg_Last
: constant Natural := Msg
'Last;
8401 Msg_Index
: Natural;
8402 Res
: String (Msg
'Range) := (others => ' ');
8403 Res_Index
: Natural;
8406 -- Copy all characters from the input message Msg to result Res with
8407 -- suitable replacements.
8409 Msg_Index
:= Msg
'First;
8410 Res_Index
:= Res
'First;
8411 while Msg_Index
<= Msg_Last
loop
8413 -- Replace "subprogram" with a different word
8415 if Msg_Index
<= Msg_Last
- 10
8416 and then Msg
(Msg_Index
.. Msg_Index
+ 9) = "subprogram"
8418 if Ekind_In
(Id
, E_Entry
, E_Entry_Family
) then
8419 Res
(Res_Index
.. Res_Index
+ 4) := "entry";
8420 Res_Index
:= Res_Index
+ 5;
8423 Res
(Res_Index
.. Res_Index
+ 8) := "task type";
8424 Res_Index
:= Res_Index
+ 9;
8427 Res
(Res_Index
.. Res_Index
+ 9) := "subprogram";
8428 Res_Index
:= Res_Index
+ 10;
8431 Msg_Index
:= Msg_Index
+ 10;
8433 -- Replace "protected" with a different word
8435 elsif Msg_Index
<= Msg_Last
- 9
8436 and then Msg
(Msg_Index
.. Msg_Index
+ 8) = "protected"
8439 Res
(Res_Index
.. Res_Index
+ 3) := "task";
8440 Res_Index
:= Res_Index
+ 4;
8441 Msg_Index
:= Msg_Index
+ 9;
8443 -- Otherwise copy the character
8446 Res
(Res_Index
) := Msg
(Msg_Index
);
8447 Msg_Index
:= Msg_Index
+ 1;
8448 Res_Index
:= Res_Index
+ 1;
8452 return Res
(Res
'First .. Res_Index
- 1);
8455 -------------------------
8456 -- From_Nested_Package --
8457 -------------------------
8459 function From_Nested_Package
(T
: Entity_Id
) return Boolean is
8460 Pack
: constant Entity_Id
:= Scope
(T
);
8464 Ekind
(Pack
) = E_Package
8465 and then not Is_Frozen
(Pack
)
8466 and then not Scope_Within_Or_Same
(Current_Scope
, Pack
)
8467 and then In_Open_Scopes
(Scope
(Pack
));
8468 end From_Nested_Package
;
8470 -----------------------
8471 -- Gather_Components --
8472 -----------------------
8474 procedure Gather_Components
8476 Comp_List
: Node_Id
;
8477 Governed_By
: List_Id
;
8479 Report_Errors
: out Boolean)
8483 Discrete_Choice
: Node_Id
;
8484 Comp_Item
: Node_Id
;
8486 Discrim
: Entity_Id
;
8487 Discrim_Name
: Node_Id
;
8488 Discrim_Value
: Node_Id
;
8491 Report_Errors
:= False;
8493 if No
(Comp_List
) or else Null_Present
(Comp_List
) then
8496 elsif Present
(Component_Items
(Comp_List
)) then
8497 Comp_Item
:= First
(Component_Items
(Comp_List
));
8503 while Present
(Comp_Item
) loop
8505 -- Skip the tag of a tagged record, the interface tags, as well
8506 -- as all items that are not user components (anonymous types,
8507 -- rep clauses, Parent field, controller field).
8509 if Nkind
(Comp_Item
) = N_Component_Declaration
then
8511 Comp
: constant Entity_Id
:= Defining_Identifier
(Comp_Item
);
8513 if not Is_Tag
(Comp
) and then Chars
(Comp
) /= Name_uParent
then
8514 Append_Elmt
(Comp
, Into
);
8522 if No
(Variant_Part
(Comp_List
)) then
8525 Discrim_Name
:= Name
(Variant_Part
(Comp_List
));
8526 Variant
:= First_Non_Pragma
(Variants
(Variant_Part
(Comp_List
)));
8529 -- Look for the discriminant that governs this variant part.
8530 -- The discriminant *must* be in the Governed_By List
8532 Assoc
:= First
(Governed_By
);
8533 Find_Constraint
: loop
8534 Discrim
:= First
(Choices
(Assoc
));
8535 exit Find_Constraint
when Chars
(Discrim_Name
) = Chars
(Discrim
)
8536 or else (Present
(Corresponding_Discriminant
(Entity
(Discrim
)))
8538 Chars
(Corresponding_Discriminant
(Entity
(Discrim
))) =
8539 Chars
(Discrim_Name
))
8540 or else Chars
(Original_Record_Component
(Entity
(Discrim
)))
8541 = Chars
(Discrim_Name
);
8543 if No
(Next
(Assoc
)) then
8544 if not Is_Constrained
(Typ
)
8545 and then Is_Derived_Type
(Typ
)
8546 and then Present
(Stored_Constraint
(Typ
))
8548 -- If the type is a tagged type with inherited discriminants,
8549 -- use the stored constraint on the parent in order to find
8550 -- the values of discriminants that are otherwise hidden by an
8551 -- explicit constraint. Renamed discriminants are handled in
8554 -- If several parent discriminants are renamed by a single
8555 -- discriminant of the derived type, the call to obtain the
8556 -- Corresponding_Discriminant field only retrieves the last
8557 -- of them. We recover the constraint on the others from the
8558 -- Stored_Constraint as well.
8565 D
:= First_Discriminant
(Etype
(Typ
));
8566 C
:= First_Elmt
(Stored_Constraint
(Typ
));
8567 while Present
(D
) and then Present
(C
) loop
8568 if Chars
(Discrim_Name
) = Chars
(D
) then
8569 if Is_Entity_Name
(Node
(C
))
8570 and then Entity
(Node
(C
)) = Entity
(Discrim
)
8572 -- D is renamed by Discrim, whose value is given in
8579 Make_Component_Association
(Sloc
(Typ
),
8581 (New_Occurrence_Of
(D
, Sloc
(Typ
))),
8582 Duplicate_Subexpr_No_Checks
(Node
(C
)));
8584 exit Find_Constraint
;
8587 Next_Discriminant
(D
);
8594 if No
(Next
(Assoc
)) then
8595 Error_Msg_NE
(" missing value for discriminant&",
8596 First
(Governed_By
), Discrim_Name
);
8597 Report_Errors
:= True;
8602 end loop Find_Constraint
;
8604 Discrim_Value
:= Expression
(Assoc
);
8606 if not Is_OK_Static_Expression
(Discrim_Value
) then
8608 -- If the variant part is governed by a discriminant of the type
8609 -- this is an error. If the variant part and the discriminant are
8610 -- inherited from an ancestor this is legal (AI05-120) unless the
8611 -- components are being gathered for an aggregate, in which case
8612 -- the caller must check Report_Errors.
8614 if Scope
(Original_Record_Component
8615 ((Entity
(First
(Choices
(Assoc
)))))) = Typ
8618 ("value for discriminant & must be static!",
8619 Discrim_Value
, Discrim
);
8620 Why_Not_Static
(Discrim_Value
);
8623 Report_Errors
:= True;
8627 Search_For_Discriminant_Value
: declare
8633 UI_Discrim_Value
: constant Uint
:= Expr_Value
(Discrim_Value
);
8636 Find_Discrete_Value
: while Present
(Variant
) loop
8637 Discrete_Choice
:= First
(Discrete_Choices
(Variant
));
8638 while Present
(Discrete_Choice
) loop
8639 exit Find_Discrete_Value
when
8640 Nkind
(Discrete_Choice
) = N_Others_Choice
;
8642 Get_Index_Bounds
(Discrete_Choice
, Low
, High
);
8644 UI_Low
:= Expr_Value
(Low
);
8645 UI_High
:= Expr_Value
(High
);
8647 exit Find_Discrete_Value
when
8648 UI_Low
<= UI_Discrim_Value
8650 UI_High
>= UI_Discrim_Value
;
8652 Next
(Discrete_Choice
);
8655 Next_Non_Pragma
(Variant
);
8656 end loop Find_Discrete_Value
;
8657 end Search_For_Discriminant_Value
;
8659 -- The case statement must include a variant that corresponds to the
8660 -- value of the discriminant, unless the discriminant type has a
8661 -- static predicate. In that case the absence of an others_choice that
8662 -- would cover this value becomes a run-time error (3.8,1 (21.1/2)).
8665 and then not Has_Static_Predicate
(Etype
(Discrim_Name
))
8668 ("value of discriminant & is out of range", Discrim_Value
, Discrim
);
8669 Report_Errors
:= True;
8673 -- If we have found the corresponding choice, recursively add its
8674 -- components to the Into list. The nested components are part of
8675 -- the same record type.
8677 if Present
(Variant
) then
8679 (Typ
, Component_List
(Variant
), Governed_By
, Into
, Report_Errors
);
8681 end Gather_Components
;
8683 ------------------------
8684 -- Get_Actual_Subtype --
8685 ------------------------
8687 function Get_Actual_Subtype
(N
: Node_Id
) return Entity_Id
is
8688 Typ
: constant Entity_Id
:= Etype
(N
);
8689 Utyp
: Entity_Id
:= Underlying_Type
(Typ
);
8698 -- If what we have is an identifier that references a subprogram
8699 -- formal, or a variable or constant object, then we get the actual
8700 -- subtype from the referenced entity if one has been built.
8702 if Nkind
(N
) = N_Identifier
8704 (Is_Formal
(Entity
(N
))
8705 or else Ekind
(Entity
(N
)) = E_Constant
8706 or else Ekind
(Entity
(N
)) = E_Variable
)
8707 and then Present
(Actual_Subtype
(Entity
(N
)))
8709 return Actual_Subtype
(Entity
(N
));
8711 -- Actual subtype of unchecked union is always itself. We never need
8712 -- the "real" actual subtype. If we did, we couldn't get it anyway
8713 -- because the discriminant is not available. The restrictions on
8714 -- Unchecked_Union are designed to make sure that this is OK.
8716 elsif Is_Unchecked_Union
(Base_Type
(Utyp
)) then
8719 -- Here for the unconstrained case, we must find actual subtype
8720 -- No actual subtype is available, so we must build it on the fly.
8722 -- Checking the type, not the underlying type, for constrainedness
8723 -- seems to be necessary. Maybe all the tests should be on the type???
8725 elsif (not Is_Constrained
(Typ
))
8726 and then (Is_Array_Type
(Utyp
)
8727 or else (Is_Record_Type
(Utyp
)
8728 and then Has_Discriminants
(Utyp
)))
8729 and then not Has_Unknown_Discriminants
(Utyp
)
8730 and then not (Ekind
(Utyp
) = E_String_Literal_Subtype
)
8732 -- Nothing to do if in spec expression (why not???)
8734 if In_Spec_Expression
then
8737 elsif Is_Private_Type
(Typ
) and then not Has_Discriminants
(Typ
) then
8739 -- If the type has no discriminants, there is no subtype to
8740 -- build, even if the underlying type is discriminated.
8744 -- Else build the actual subtype
8747 Decl
:= Build_Actual_Subtype
(Typ
, N
);
8748 Atyp
:= Defining_Identifier
(Decl
);
8750 -- If Build_Actual_Subtype generated a new declaration then use it
8754 -- The actual subtype is an Itype, so analyze the declaration,
8755 -- but do not attach it to the tree, to get the type defined.
8757 Set_Parent
(Decl
, N
);
8758 Set_Is_Itype
(Atyp
);
8759 Analyze
(Decl
, Suppress
=> All_Checks
);
8760 Set_Associated_Node_For_Itype
(Atyp
, N
);
8761 Set_Has_Delayed_Freeze
(Atyp
, False);
8763 -- We need to freeze the actual subtype immediately. This is
8764 -- needed, because otherwise this Itype will not get frozen
8765 -- at all, and it is always safe to freeze on creation because
8766 -- any associated types must be frozen at this point.
8768 Freeze_Itype
(Atyp
, N
);
8771 -- Otherwise we did not build a declaration, so return original
8778 -- For all remaining cases, the actual subtype is the same as
8779 -- the nominal type.
8784 end Get_Actual_Subtype
;
8786 -------------------------------------
8787 -- Get_Actual_Subtype_If_Available --
8788 -------------------------------------
8790 function Get_Actual_Subtype_If_Available
(N
: Node_Id
) return Entity_Id
is
8791 Typ
: constant Entity_Id
:= Etype
(N
);
8794 -- If what we have is an identifier that references a subprogram
8795 -- formal, or a variable or constant object, then we get the actual
8796 -- subtype from the referenced entity if one has been built.
8798 if Nkind
(N
) = N_Identifier
8800 (Is_Formal
(Entity
(N
))
8801 or else Ekind
(Entity
(N
)) = E_Constant
8802 or else Ekind
(Entity
(N
)) = E_Variable
)
8803 and then Present
(Actual_Subtype
(Entity
(N
)))
8805 return Actual_Subtype
(Entity
(N
));
8807 -- Otherwise the Etype of N is returned unchanged
8812 end Get_Actual_Subtype_If_Available
;
8814 ------------------------
8815 -- Get_Body_From_Stub --
8816 ------------------------
8818 function Get_Body_From_Stub
(N
: Node_Id
) return Node_Id
is
8820 return Proper_Body
(Unit
(Library_Unit
(N
)));
8821 end Get_Body_From_Stub
;
8823 ---------------------
8824 -- Get_Cursor_Type --
8825 ---------------------
8827 function Get_Cursor_Type
8829 Typ
: Entity_Id
) return Entity_Id
8833 First_Op
: Entity_Id
;
8837 -- If error already detected, return
8839 if Error_Posted
(Aspect
) then
8843 -- The cursor type for an Iterable aspect is the return type of a
8844 -- non-overloaded First primitive operation. Locate association for
8847 Assoc
:= First
(Component_Associations
(Expression
(Aspect
)));
8849 while Present
(Assoc
) loop
8850 if Chars
(First
(Choices
(Assoc
))) = Name_First
then
8851 First_Op
:= Expression
(Assoc
);
8858 if First_Op
= Any_Id
then
8859 Error_Msg_N
("aspect Iterable must specify First operation", Aspect
);
8865 -- Locate function with desired name and profile in scope of type
8866 -- In the rare case where the type is an integer type, a base type
8867 -- is created for it, check that the base type of the first formal
8868 -- of First matches the base type of the domain.
8870 Func
:= First_Entity
(Scope
(Typ
));
8871 while Present
(Func
) loop
8872 if Chars
(Func
) = Chars
(First_Op
)
8873 and then Ekind
(Func
) = E_Function
8874 and then Present
(First_Formal
(Func
))
8875 and then Base_Type
(Etype
(First_Formal
(Func
))) = Base_Type
(Typ
)
8876 and then No
(Next_Formal
(First_Formal
(Func
)))
8878 if Cursor
/= Any_Type
then
8880 ("Operation First for iterable type must be unique", Aspect
);
8883 Cursor
:= Etype
(Func
);
8890 -- If not found, no way to resolve remaining primitives.
8892 if Cursor
= Any_Type
then
8894 ("No legal primitive operation First for Iterable type", Aspect
);
8898 end Get_Cursor_Type
;
8900 function Get_Cursor_Type
(Typ
: Entity_Id
) return Entity_Id
is
8902 return Etype
(Get_Iterable_Type_Primitive
(Typ
, Name_First
));
8903 end Get_Cursor_Type
;
8905 -------------------------------
8906 -- Get_Default_External_Name --
8907 -------------------------------
8909 function Get_Default_External_Name
(E
: Node_Or_Entity_Id
) return Node_Id
is
8911 Get_Decoded_Name_String
(Chars
(E
));
8913 if Opt
.External_Name_Imp_Casing
= Uppercase
then
8914 Set_Casing
(All_Upper_Case
);
8916 Set_Casing
(All_Lower_Case
);
8920 Make_String_Literal
(Sloc
(E
),
8921 Strval
=> String_From_Name_Buffer
);
8922 end Get_Default_External_Name
;
8924 --------------------------
8925 -- Get_Enclosing_Object --
8926 --------------------------
8928 function Get_Enclosing_Object
(N
: Node_Id
) return Entity_Id
is
8930 if Is_Entity_Name
(N
) then
8934 when N_Indexed_Component
8935 | N_Selected_Component
8938 -- If not generating code, a dereference may be left implicit.
8939 -- In thoses cases, return Empty.
8941 if Is_Access_Type
(Etype
(Prefix
(N
))) then
8944 return Get_Enclosing_Object
(Prefix
(N
));
8947 when N_Type_Conversion
=>
8948 return Get_Enclosing_Object
(Expression
(N
));
8954 end Get_Enclosing_Object
;
8956 ---------------------------
8957 -- Get_Enum_Lit_From_Pos --
8958 ---------------------------
8960 function Get_Enum_Lit_From_Pos
8963 Loc
: Source_Ptr
) return Node_Id
8965 Btyp
: Entity_Id
:= Base_Type
(T
);
8970 -- In the case where the literal is of type Character, Wide_Character
8971 -- or Wide_Wide_Character or of a type derived from them, there needs
8972 -- to be some special handling since there is no explicit chain of
8973 -- literals to search. Instead, an N_Character_Literal node is created
8974 -- with the appropriate Char_Code and Chars fields.
8976 if Is_Standard_Character_Type
(T
) then
8977 Set_Character_Literal_Name
(UI_To_CC
(Pos
));
8980 Make_Character_Literal
(Loc
,
8982 Char_Literal_Value
=> Pos
);
8984 -- For all other cases, we have a complete table of literals, and
8985 -- we simply iterate through the chain of literal until the one
8986 -- with the desired position value is found.
8989 if Is_Private_Type
(Btyp
) and then Present
(Full_View
(Btyp
)) then
8990 Btyp
:= Full_View
(Btyp
);
8993 Lit
:= First_Literal
(Btyp
);
8995 -- Position in the enumeration type starts at 0
8997 if UI_To_Int
(Pos
) < 0 then
8998 raise Constraint_Error
;
9001 for J
in 1 .. UI_To_Int
(Pos
) loop
9004 -- If Lit is Empty, Pos is not in range, so raise Constraint_Error
9005 -- inside the loop to avoid calling Next_Literal on Empty.
9008 raise Constraint_Error
;
9012 -- Create a new node from Lit, with source location provided by Loc
9013 -- if not equal to No_Location, or by copying the source location of
9018 if LLoc
= No_Location
then
9022 return New_Occurrence_Of
(Lit
, LLoc
);
9024 end Get_Enum_Lit_From_Pos
;
9026 ------------------------
9027 -- Get_Generic_Entity --
9028 ------------------------
9030 function Get_Generic_Entity
(N
: Node_Id
) return Entity_Id
is
9031 Ent
: constant Entity_Id
:= Entity
(Name
(N
));
9033 if Present
(Renamed_Object
(Ent
)) then
9034 return Renamed_Object
(Ent
);
9038 end Get_Generic_Entity
;
9040 -------------------------------------
9041 -- Get_Incomplete_View_Of_Ancestor --
9042 -------------------------------------
9044 function Get_Incomplete_View_Of_Ancestor
(E
: Entity_Id
) return Entity_Id
is
9045 Cur_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
9046 Par_Scope
: Entity_Id
;
9047 Par_Type
: Entity_Id
;
9050 -- The incomplete view of an ancestor is only relevant for private
9051 -- derived types in child units.
9053 if not Is_Derived_Type
(E
)
9054 or else not Is_Child_Unit
(Cur_Unit
)
9059 Par_Scope
:= Scope
(Cur_Unit
);
9060 if No
(Par_Scope
) then
9064 Par_Type
:= Etype
(Base_Type
(E
));
9066 -- Traverse list of ancestor types until we find one declared in
9067 -- a parent or grandparent unit (two levels seem sufficient).
9069 while Present
(Par_Type
) loop
9070 if Scope
(Par_Type
) = Par_Scope
9071 or else Scope
(Par_Type
) = Scope
(Par_Scope
)
9075 elsif not Is_Derived_Type
(Par_Type
) then
9079 Par_Type
:= Etype
(Base_Type
(Par_Type
));
9083 -- If none found, there is no relevant ancestor type.
9087 end Get_Incomplete_View_Of_Ancestor
;
9089 ----------------------
9090 -- Get_Index_Bounds --
9091 ----------------------
9093 procedure Get_Index_Bounds
9097 Use_Full_View
: Boolean := False)
9099 function Scalar_Range_Of_Type
(Typ
: Entity_Id
) return Node_Id
;
9100 -- Obtain the scalar range of type Typ. If flag Use_Full_View is set and
9101 -- Typ qualifies, the scalar range is obtained from the full view of the
9104 --------------------------
9105 -- Scalar_Range_Of_Type --
9106 --------------------------
9108 function Scalar_Range_Of_Type
(Typ
: Entity_Id
) return Node_Id
is
9109 T
: Entity_Id
:= Typ
;
9112 if Use_Full_View
and then Present
(Full_View
(T
)) then
9116 return Scalar_Range
(T
);
9117 end Scalar_Range_Of_Type
;
9121 Kind
: constant Node_Kind
:= Nkind
(N
);
9124 -- Start of processing for Get_Index_Bounds
9127 if Kind
= N_Range
then
9129 H
:= High_Bound
(N
);
9131 elsif Kind
= N_Subtype_Indication
then
9132 Rng
:= Range_Expression
(Constraint
(N
));
9140 L
:= Low_Bound
(Range_Expression
(Constraint
(N
)));
9141 H
:= High_Bound
(Range_Expression
(Constraint
(N
)));
9144 elsif Is_Entity_Name
(N
) and then Is_Type
(Entity
(N
)) then
9145 Rng
:= Scalar_Range_Of_Type
(Entity
(N
));
9147 if Error_Posted
(Rng
) then
9151 elsif Nkind
(Rng
) = N_Subtype_Indication
then
9152 Get_Index_Bounds
(Rng
, L
, H
);
9155 L
:= Low_Bound
(Rng
);
9156 H
:= High_Bound
(Rng
);
9160 -- N is an expression, indicating a range with one value
9165 end Get_Index_Bounds
;
9167 -----------------------------
9168 -- Get_Interfacing_Aspects --
9169 -----------------------------
9171 procedure Get_Interfacing_Aspects
9172 (Iface_Asp
: Node_Id
;
9173 Conv_Asp
: out Node_Id
;
9174 EN_Asp
: out Node_Id
;
9175 Expo_Asp
: out Node_Id
;
9176 Imp_Asp
: out Node_Id
;
9177 LN_Asp
: out Node_Id
;
9178 Do_Checks
: Boolean := False)
9180 procedure Save_Or_Duplication_Error
9182 To
: in out Node_Id
);
9183 -- Save the value of aspect Asp in node To. If To already has a value,
9184 -- then this is considered a duplicate use of aspect. Emit an error if
9185 -- flag Do_Checks is set.
9187 -------------------------------
9188 -- Save_Or_Duplication_Error --
9189 -------------------------------
9191 procedure Save_Or_Duplication_Error
9193 To
: in out Node_Id
)
9196 -- Detect an extra aspect and issue an error
9198 if Present
(To
) then
9200 Error_Msg_Name_1
:= Chars
(Identifier
(Asp
));
9201 Error_Msg_Sloc
:= Sloc
(To
);
9202 Error_Msg_N
("aspect % previously given #", Asp
);
9205 -- Otherwise capture the aspect
9210 end Save_Or_Duplication_Error
;
9217 -- The following variables capture each individual aspect
9219 Conv
: Node_Id
:= Empty
;
9220 EN
: Node_Id
:= Empty
;
9221 Expo
: Node_Id
:= Empty
;
9222 Imp
: Node_Id
:= Empty
;
9223 LN
: Node_Id
:= Empty
;
9225 -- Start of processing for Get_Interfacing_Aspects
9228 -- The input interfacing aspect should reside in an aspect specification
9231 pragma Assert
(Is_List_Member
(Iface_Asp
));
9233 -- Examine the aspect specifications of the related entity. Find and
9234 -- capture all interfacing aspects. Detect duplicates and emit errors
9237 Asp
:= First
(List_Containing
(Iface_Asp
));
9238 while Present
(Asp
) loop
9239 Asp_Id
:= Get_Aspect_Id
(Asp
);
9241 if Asp_Id
= Aspect_Convention
then
9242 Save_Or_Duplication_Error
(Asp
, Conv
);
9244 elsif Asp_Id
= Aspect_External_Name
then
9245 Save_Or_Duplication_Error
(Asp
, EN
);
9247 elsif Asp_Id
= Aspect_Export
then
9248 Save_Or_Duplication_Error
(Asp
, Expo
);
9250 elsif Asp_Id
= Aspect_Import
then
9251 Save_Or_Duplication_Error
(Asp
, Imp
);
9253 elsif Asp_Id
= Aspect_Link_Name
then
9254 Save_Or_Duplication_Error
(Asp
, LN
);
9265 end Get_Interfacing_Aspects
;
9267 ---------------------------------
9268 -- Get_Iterable_Type_Primitive --
9269 ---------------------------------
9271 function Get_Iterable_Type_Primitive
9273 Nam
: Name_Id
) return Entity_Id
9275 Funcs
: constant Node_Id
:= Find_Value_Of_Aspect
(Typ
, Aspect_Iterable
);
9283 Assoc
:= First
(Component_Associations
(Funcs
));
9284 while Present
(Assoc
) loop
9285 if Chars
(First
(Choices
(Assoc
))) = Nam
then
9286 return Entity
(Expression
(Assoc
));
9289 Assoc
:= Next
(Assoc
);
9294 end Get_Iterable_Type_Primitive
;
9296 ----------------------------------
9297 -- Get_Library_Unit_Name_string --
9298 ----------------------------------
9300 procedure Get_Library_Unit_Name_String
(Decl_Node
: Node_Id
) is
9301 Unit_Name_Id
: constant Unit_Name_Type
:= Get_Unit_Name
(Decl_Node
);
9304 Get_Unit_Name_String
(Unit_Name_Id
);
9306 -- Remove seven last character (" (spec)" or " (body)")
9308 Name_Len
:= Name_Len
- 7;
9309 pragma Assert
(Name_Buffer
(Name_Len
+ 1) = ' ');
9310 end Get_Library_Unit_Name_String
;
9312 --------------------------
9313 -- Get_Max_Queue_Length --
9314 --------------------------
9316 function Get_Max_Queue_Length
(Id
: Entity_Id
) return Uint
is
9317 pragma Assert
(Is_Entry
(Id
));
9318 Prag
: constant Entity_Id
:= Get_Pragma
(Id
, Pragma_Max_Queue_Length
);
9321 -- A value of 0 represents no maximum specified, and entries and entry
9322 -- families with no Max_Queue_Length aspect or pragma default to it.
9324 if not Present
(Prag
) then
9328 return Intval
(Expression
(First
(Pragma_Argument_Associations
(Prag
))));
9329 end Get_Max_Queue_Length
;
9331 ------------------------
9332 -- Get_Name_Entity_Id --
9333 ------------------------
9335 function Get_Name_Entity_Id
(Id
: Name_Id
) return Entity_Id
is
9337 return Entity_Id
(Get_Name_Table_Int
(Id
));
9338 end Get_Name_Entity_Id
;
9340 ------------------------------
9341 -- Get_Name_From_CTC_Pragma --
9342 ------------------------------
9344 function Get_Name_From_CTC_Pragma
(N
: Node_Id
) return String_Id
is
9345 Arg
: constant Node_Id
:=
9346 Get_Pragma_Arg
(First
(Pragma_Argument_Associations
(N
)));
9348 return Strval
(Expr_Value_S
(Arg
));
9349 end Get_Name_From_CTC_Pragma
;
9351 -----------------------
9352 -- Get_Parent_Entity --
9353 -----------------------
9355 function Get_Parent_Entity
(Unit
: Node_Id
) return Entity_Id
is
9357 if Nkind
(Unit
) = N_Package_Body
9358 and then Nkind
(Original_Node
(Unit
)) = N_Package_Instantiation
9360 return Defining_Entity
9361 (Specification
(Instance_Spec
(Original_Node
(Unit
))));
9362 elsif Nkind
(Unit
) = N_Package_Instantiation
then
9363 return Defining_Entity
(Specification
(Instance_Spec
(Unit
)));
9365 return Defining_Entity
(Unit
);
9367 end Get_Parent_Entity
;
9373 function Get_Pragma_Id
(N
: Node_Id
) return Pragma_Id
is
9375 return Get_Pragma_Id
(Pragma_Name_Unmapped
(N
));
9378 ------------------------
9379 -- Get_Qualified_Name --
9380 ------------------------
9382 function Get_Qualified_Name
9384 Suffix
: Entity_Id
:= Empty
) return Name_Id
9386 Suffix_Nam
: Name_Id
:= No_Name
;
9389 if Present
(Suffix
) then
9390 Suffix_Nam
:= Chars
(Suffix
);
9393 return Get_Qualified_Name
(Chars
(Id
), Suffix_Nam
, Scope
(Id
));
9394 end Get_Qualified_Name
;
9396 function Get_Qualified_Name
9398 Suffix
: Name_Id
:= No_Name
;
9399 Scop
: Entity_Id
:= Current_Scope
) return Name_Id
9401 procedure Add_Scope
(S
: Entity_Id
);
9402 -- Add the fully qualified form of scope S to the name buffer. The
9410 procedure Add_Scope
(S
: Entity_Id
) is
9415 elsif S
= Standard_Standard
then
9419 Add_Scope
(Scope
(S
));
9420 Get_Name_String_And_Append
(Chars
(S
));
9421 Add_Str_To_Name_Buffer
("__");
9425 -- Start of processing for Get_Qualified_Name
9431 -- Append the base name after all scopes have been chained
9433 Get_Name_String_And_Append
(Nam
);
9435 -- Append the suffix (if present)
9437 if Suffix
/= No_Name
then
9438 Add_Str_To_Name_Buffer
("__");
9439 Get_Name_String_And_Append
(Suffix
);
9443 end Get_Qualified_Name
;
9445 -----------------------
9446 -- Get_Reason_String --
9447 -----------------------
9449 procedure Get_Reason_String
(N
: Node_Id
) is
9451 if Nkind
(N
) = N_String_Literal
then
9452 Store_String_Chars
(Strval
(N
));
9454 elsif Nkind
(N
) = N_Op_Concat
then
9455 Get_Reason_String
(Left_Opnd
(N
));
9456 Get_Reason_String
(Right_Opnd
(N
));
9458 -- If not of required form, error
9462 ("Reason for pragma Warnings has wrong form", N
);
9464 ("\must be string literal or concatenation of string literals", N
);
9467 end Get_Reason_String
;
9469 --------------------------------
9470 -- Get_Reference_Discriminant --
9471 --------------------------------
9473 function Get_Reference_Discriminant
(Typ
: Entity_Id
) return Entity_Id
is
9477 D
:= First_Discriminant
(Typ
);
9478 while Present
(D
) loop
9479 if Has_Implicit_Dereference
(D
) then
9482 Next_Discriminant
(D
);
9486 end Get_Reference_Discriminant
;
9488 ---------------------------
9489 -- Get_Referenced_Object --
9490 ---------------------------
9492 function Get_Referenced_Object
(N
: Node_Id
) return Node_Id
is
9497 while Is_Entity_Name
(R
)
9498 and then Present
(Renamed_Object
(Entity
(R
)))
9500 R
:= Renamed_Object
(Entity
(R
));
9504 end Get_Referenced_Object
;
9506 ------------------------
9507 -- Get_Renamed_Entity --
9508 ------------------------
9510 function Get_Renamed_Entity
(E
: Entity_Id
) return Entity_Id
is
9515 while Present
(Renamed_Entity
(R
)) loop
9516 R
:= Renamed_Entity
(R
);
9520 end Get_Renamed_Entity
;
9522 -----------------------
9523 -- Get_Return_Object --
9524 -----------------------
9526 function Get_Return_Object
(N
: Node_Id
) return Entity_Id
is
9530 Decl
:= First
(Return_Object_Declarations
(N
));
9531 while Present
(Decl
) loop
9532 exit when Nkind
(Decl
) = N_Object_Declaration
9533 and then Is_Return_Object
(Defining_Identifier
(Decl
));
9537 pragma Assert
(Present
(Decl
));
9538 return Defining_Identifier
(Decl
);
9539 end Get_Return_Object
;
9541 ---------------------------
9542 -- Get_Subprogram_Entity --
9543 ---------------------------
9545 function Get_Subprogram_Entity
(Nod
: Node_Id
) return Entity_Id
is
9547 Subp_Id
: Entity_Id
;
9550 if Nkind
(Nod
) = N_Accept_Statement
then
9551 Subp
:= Entry_Direct_Name
(Nod
);
9553 elsif Nkind
(Nod
) = N_Slice
then
9554 Subp
:= Prefix
(Nod
);
9560 -- Strip the subprogram call
9563 if Nkind_In
(Subp
, N_Explicit_Dereference
,
9564 N_Indexed_Component
,
9565 N_Selected_Component
)
9567 Subp
:= Prefix
(Subp
);
9569 elsif Nkind_In
(Subp
, N_Type_Conversion
,
9570 N_Unchecked_Type_Conversion
)
9572 Subp
:= Expression
(Subp
);
9579 -- Extract the entity of the subprogram call
9581 if Is_Entity_Name
(Subp
) then
9582 Subp_Id
:= Entity
(Subp
);
9584 if Ekind
(Subp_Id
) = E_Access_Subprogram_Type
then
9585 Subp_Id
:= Directly_Designated_Type
(Subp_Id
);
9588 if Is_Subprogram
(Subp_Id
) then
9594 -- The search did not find a construct that denotes a subprogram
9599 end Get_Subprogram_Entity
;
9601 -----------------------------
9602 -- Get_Task_Body_Procedure --
9603 -----------------------------
9605 function Get_Task_Body_Procedure
(E
: Entity_Id
) return Entity_Id
is
9607 -- Note: A task type may be the completion of a private type with
9608 -- discriminants. When performing elaboration checks on a task
9609 -- declaration, the current view of the type may be the private one,
9610 -- and the procedure that holds the body of the task is held in its
9613 -- This is an odd function, why not have Task_Body_Procedure do
9614 -- the following digging???
9616 return Task_Body_Procedure
(Underlying_Type
(Root_Type
(E
)));
9617 end Get_Task_Body_Procedure
;
9619 -------------------------
9620 -- Get_User_Defined_Eq --
9621 -------------------------
9623 function Get_User_Defined_Eq
(E
: Entity_Id
) return Entity_Id
is
9628 Prim
:= First_Elmt
(Collect_Primitive_Operations
(E
));
9629 while Present
(Prim
) loop
9632 if Chars
(Op
) = Name_Op_Eq
9633 and then Etype
(Op
) = Standard_Boolean
9634 and then Etype
(First_Formal
(Op
)) = E
9635 and then Etype
(Next_Formal
(First_Formal
(Op
))) = E
9644 end Get_User_Defined_Eq
;
9652 Priv_Typ
: out Entity_Id
;
9653 Full_Typ
: out Entity_Id
;
9654 Full_Base
: out Entity_Id
;
9655 CRec_Typ
: out Entity_Id
)
9657 IP_View
: Entity_Id
;
9660 -- Assume that none of the views can be recovered
9667 -- The input type is the corresponding record type of a protected or a
9670 if Ekind
(Typ
) = E_Record_Type
9671 and then Is_Concurrent_Record_Type
(Typ
)
9674 Full_Typ
:= Corresponding_Concurrent_Type
(CRec_Typ
);
9675 Full_Base
:= Base_Type
(Full_Typ
);
9676 Priv_Typ
:= Incomplete_Or_Partial_View
(Full_Typ
);
9678 -- Otherwise the input type denotes an arbitrary type
9681 IP_View
:= Incomplete_Or_Partial_View
(Typ
);
9683 -- The input type denotes the full view of a private type
9685 if Present
(IP_View
) then
9686 Priv_Typ
:= IP_View
;
9689 -- The input type is a private type
9691 elsif Is_Private_Type
(Typ
) then
9693 Full_Typ
:= Full_View
(Priv_Typ
);
9695 -- Otherwise the input type does not have any views
9701 if Present
(Full_Typ
) then
9702 Full_Base
:= Base_Type
(Full_Typ
);
9704 if Ekind_In
(Full_Typ
, E_Protected_Type
, E_Task_Type
) then
9705 CRec_Typ
:= Corresponding_Record_Type
(Full_Typ
);
9711 -----------------------
9712 -- Has_Access_Values --
9713 -----------------------
9715 function Has_Access_Values
(T
: Entity_Id
) return Boolean is
9716 Typ
: constant Entity_Id
:= Underlying_Type
(T
);
9719 -- Case of a private type which is not completed yet. This can only
9720 -- happen in the case of a generic format type appearing directly, or
9721 -- as a component of the type to which this function is being applied
9722 -- at the top level. Return False in this case, since we certainly do
9723 -- not know that the type contains access types.
9728 elsif Is_Access_Type
(Typ
) then
9731 elsif Is_Array_Type
(Typ
) then
9732 return Has_Access_Values
(Component_Type
(Typ
));
9734 elsif Is_Record_Type
(Typ
) then
9739 -- Loop to Check components
9741 Comp
:= First_Component_Or_Discriminant
(Typ
);
9742 while Present
(Comp
) loop
9744 -- Check for access component, tag field does not count, even
9745 -- though it is implemented internally using an access type.
9747 if Has_Access_Values
(Etype
(Comp
))
9748 and then Chars
(Comp
) /= Name_uTag
9753 Next_Component_Or_Discriminant
(Comp
);
9762 end Has_Access_Values
;
9764 ------------------------------
9765 -- Has_Compatible_Alignment --
9766 ------------------------------
9768 function Has_Compatible_Alignment
9771 Layout_Done
: Boolean) return Alignment_Result
9773 function Has_Compatible_Alignment_Internal
9776 Layout_Done
: Boolean;
9777 Default
: Alignment_Result
) return Alignment_Result
;
9778 -- This is the internal recursive function that actually does the work.
9779 -- There is one additional parameter, which says what the result should
9780 -- be if no alignment information is found, and there is no definite
9781 -- indication of compatible alignments. At the outer level, this is set
9782 -- to Unknown, but for internal recursive calls in the case where types
9783 -- are known to be correct, it is set to Known_Compatible.
9785 ---------------------------------------
9786 -- Has_Compatible_Alignment_Internal --
9787 ---------------------------------------
9789 function Has_Compatible_Alignment_Internal
9792 Layout_Done
: Boolean;
9793 Default
: Alignment_Result
) return Alignment_Result
9795 Result
: Alignment_Result
:= Known_Compatible
;
9796 -- Holds the current status of the result. Note that once a value of
9797 -- Known_Incompatible is set, it is sticky and does not get changed
9798 -- to Unknown (the value in Result only gets worse as we go along,
9801 Offs
: Uint
:= No_Uint
;
9802 -- Set to a factor of the offset from the base object when Expr is a
9803 -- selected or indexed component, based on Component_Bit_Offset and
9804 -- Component_Size respectively. A negative value is used to represent
9805 -- a value which is not known at compile time.
9807 procedure Check_Prefix
;
9808 -- Checks the prefix recursively in the case where the expression
9809 -- is an indexed or selected component.
9811 procedure Set_Result
(R
: Alignment_Result
);
9812 -- If R represents a worse outcome (unknown instead of known
9813 -- compatible, or known incompatible), then set Result to R.
9819 procedure Check_Prefix
is
9821 -- The subtlety here is that in doing a recursive call to check
9822 -- the prefix, we have to decide what to do in the case where we
9823 -- don't find any specific indication of an alignment problem.
9825 -- At the outer level, we normally set Unknown as the result in
9826 -- this case, since we can only set Known_Compatible if we really
9827 -- know that the alignment value is OK, but for the recursive
9828 -- call, in the case where the types match, and we have not
9829 -- specified a peculiar alignment for the object, we are only
9830 -- concerned about suspicious rep clauses, the default case does
9831 -- not affect us, since the compiler will, in the absence of such
9832 -- rep clauses, ensure that the alignment is correct.
9834 if Default
= Known_Compatible
9836 (Etype
(Obj
) = Etype
(Expr
)
9837 and then (Unknown_Alignment
(Obj
)
9839 Alignment
(Obj
) = Alignment
(Etype
(Obj
))))
9842 (Has_Compatible_Alignment_Internal
9843 (Obj
, Prefix
(Expr
), Layout_Done
, Known_Compatible
));
9845 -- In all other cases, we need a full check on the prefix
9849 (Has_Compatible_Alignment_Internal
9850 (Obj
, Prefix
(Expr
), Layout_Done
, Unknown
));
9858 procedure Set_Result
(R
: Alignment_Result
) is
9865 -- Start of processing for Has_Compatible_Alignment_Internal
9868 -- If Expr is a selected component, we must make sure there is no
9869 -- potentially troublesome component clause and that the record is
9870 -- not packed if the layout is not done.
9872 if Nkind
(Expr
) = N_Selected_Component
then
9874 -- Packing generates unknown alignment if layout is not done
9876 if Is_Packed
(Etype
(Prefix
(Expr
))) and then not Layout_Done
then
9877 Set_Result
(Unknown
);
9880 -- Check prefix and component offset
9883 Offs
:= Component_Bit_Offset
(Entity
(Selector_Name
(Expr
)));
9885 -- If Expr is an indexed component, we must make sure there is no
9886 -- potentially troublesome Component_Size clause and that the array
9887 -- is not bit-packed if the layout is not done.
9889 elsif Nkind
(Expr
) = N_Indexed_Component
then
9891 Typ
: constant Entity_Id
:= Etype
(Prefix
(Expr
));
9894 -- Packing generates unknown alignment if layout is not done
9896 if Is_Bit_Packed_Array
(Typ
) and then not Layout_Done
then
9897 Set_Result
(Unknown
);
9900 -- Check prefix and component offset (or at least size)
9903 Offs
:= Indexed_Component_Bit_Offset
(Expr
);
9904 if Offs
= No_Uint
then
9905 Offs
:= Component_Size
(Typ
);
9910 -- If we have a null offset, the result is entirely determined by
9911 -- the base object and has already been computed recursively.
9913 if Offs
= Uint_0
then
9916 -- Case where we know the alignment of the object
9918 elsif Known_Alignment
(Obj
) then
9920 ObjA
: constant Uint
:= Alignment
(Obj
);
9921 ExpA
: Uint
:= No_Uint
;
9922 SizA
: Uint
:= No_Uint
;
9925 -- If alignment of Obj is 1, then we are always OK
9928 Set_Result
(Known_Compatible
);
9930 -- Alignment of Obj is greater than 1, so we need to check
9933 -- If we have an offset, see if it is compatible
9935 if Offs
/= No_Uint
and Offs
> Uint_0
then
9936 if Offs
mod (System_Storage_Unit
* ObjA
) /= 0 then
9937 Set_Result
(Known_Incompatible
);
9940 -- See if Expr is an object with known alignment
9942 elsif Is_Entity_Name
(Expr
)
9943 and then Known_Alignment
(Entity
(Expr
))
9945 ExpA
:= Alignment
(Entity
(Expr
));
9947 -- Otherwise, we can use the alignment of the type of
9948 -- Expr given that we already checked for
9949 -- discombobulating rep clauses for the cases of indexed
9950 -- and selected components above.
9952 elsif Known_Alignment
(Etype
(Expr
)) then
9953 ExpA
:= Alignment
(Etype
(Expr
));
9955 -- Otherwise the alignment is unknown
9958 Set_Result
(Default
);
9961 -- If we got an alignment, see if it is acceptable
9963 if ExpA
/= No_Uint
and then ExpA
< ObjA
then
9964 Set_Result
(Known_Incompatible
);
9967 -- If Expr is not a piece of a larger object, see if size
9968 -- is given. If so, check that it is not too small for the
9969 -- required alignment.
9971 if Offs
/= No_Uint
then
9974 -- See if Expr is an object with known size
9976 elsif Is_Entity_Name
(Expr
)
9977 and then Known_Static_Esize
(Entity
(Expr
))
9979 SizA
:= Esize
(Entity
(Expr
));
9981 -- Otherwise, we check the object size of the Expr type
9983 elsif Known_Static_Esize
(Etype
(Expr
)) then
9984 SizA
:= Esize
(Etype
(Expr
));
9987 -- If we got a size, see if it is a multiple of the Obj
9988 -- alignment, if not, then the alignment cannot be
9989 -- acceptable, since the size is always a multiple of the
9992 if SizA
/= No_Uint
then
9993 if SizA
mod (ObjA
* Ttypes
.System_Storage_Unit
) /= 0 then
9994 Set_Result
(Known_Incompatible
);
10000 -- If we do not know required alignment, any non-zero offset is a
10001 -- potential problem (but certainly may be OK, so result is unknown).
10003 elsif Offs
/= No_Uint
then
10004 Set_Result
(Unknown
);
10006 -- If we can't find the result by direct comparison of alignment
10007 -- values, then there is still one case that we can determine known
10008 -- result, and that is when we can determine that the types are the
10009 -- same, and no alignments are specified. Then we known that the
10010 -- alignments are compatible, even if we don't know the alignment
10011 -- value in the front end.
10013 elsif Etype
(Obj
) = Etype
(Expr
) then
10015 -- Types are the same, but we have to check for possible size
10016 -- and alignments on the Expr object that may make the alignment
10017 -- different, even though the types are the same.
10019 if Is_Entity_Name
(Expr
) then
10021 -- First check alignment of the Expr object. Any alignment less
10022 -- than Maximum_Alignment is worrisome since this is the case
10023 -- where we do not know the alignment of Obj.
10025 if Known_Alignment
(Entity
(Expr
))
10026 and then UI_To_Int
(Alignment
(Entity
(Expr
))) <
10027 Ttypes
.Maximum_Alignment
10029 Set_Result
(Unknown
);
10031 -- Now check size of Expr object. Any size that is not an
10032 -- even multiple of Maximum_Alignment is also worrisome
10033 -- since it may cause the alignment of the object to be less
10034 -- than the alignment of the type.
10036 elsif Known_Static_Esize
(Entity
(Expr
))
10038 (UI_To_Int
(Esize
(Entity
(Expr
))) mod
10039 (Ttypes
.Maximum_Alignment
* Ttypes
.System_Storage_Unit
))
10042 Set_Result
(Unknown
);
10044 -- Otherwise same type is decisive
10047 Set_Result
(Known_Compatible
);
10051 -- Another case to deal with is when there is an explicit size or
10052 -- alignment clause when the types are not the same. If so, then the
10053 -- result is Unknown. We don't need to do this test if the Default is
10054 -- Unknown, since that result will be set in any case.
10056 elsif Default
/= Unknown
10057 and then (Has_Size_Clause
(Etype
(Expr
))
10059 Has_Alignment_Clause
(Etype
(Expr
)))
10061 Set_Result
(Unknown
);
10063 -- If no indication found, set default
10066 Set_Result
(Default
);
10069 -- Return worst result found
10072 end Has_Compatible_Alignment_Internal
;
10074 -- Start of processing for Has_Compatible_Alignment
10077 -- If Obj has no specified alignment, then set alignment from the type
10078 -- alignment. Perhaps we should always do this, but for sure we should
10079 -- do it when there is an address clause since we can do more if the
10080 -- alignment is known.
10082 if Unknown_Alignment
(Obj
) then
10083 Set_Alignment
(Obj
, Alignment
(Etype
(Obj
)));
10086 -- Now do the internal call that does all the work
10089 Has_Compatible_Alignment_Internal
(Obj
, Expr
, Layout_Done
, Unknown
);
10090 end Has_Compatible_Alignment
;
10092 ----------------------
10093 -- Has_Declarations --
10094 ----------------------
10096 function Has_Declarations
(N
: Node_Id
) return Boolean is
10098 return Nkind_In
(Nkind
(N
), N_Accept_Statement
,
10100 N_Compilation_Unit_Aux
,
10106 N_Package_Specification
);
10107 end Has_Declarations
;
10109 ---------------------------------
10110 -- Has_Defaulted_Discriminants --
10111 ---------------------------------
10113 function Has_Defaulted_Discriminants
(Typ
: Entity_Id
) return Boolean is
10115 return Has_Discriminants
(Typ
)
10116 and then Present
(First_Discriminant
(Typ
))
10117 and then Present
(Discriminant_Default_Value
10118 (First_Discriminant
(Typ
)));
10119 end Has_Defaulted_Discriminants
;
10121 -------------------
10122 -- Has_Denormals --
10123 -------------------
10125 function Has_Denormals
(E
: Entity_Id
) return Boolean is
10127 return Is_Floating_Point_Type
(E
) and then Denorm_On_Target
;
10130 -------------------------------------------
10131 -- Has_Discriminant_Dependent_Constraint --
10132 -------------------------------------------
10134 function Has_Discriminant_Dependent_Constraint
10135 (Comp
: Entity_Id
) return Boolean
10137 Comp_Decl
: constant Node_Id
:= Parent
(Comp
);
10138 Subt_Indic
: Node_Id
;
10143 -- Discriminants can't depend on discriminants
10145 if Ekind
(Comp
) = E_Discriminant
then
10149 Subt_Indic
:= Subtype_Indication
(Component_Definition
(Comp_Decl
));
10151 if Nkind
(Subt_Indic
) = N_Subtype_Indication
then
10152 Constr
:= Constraint
(Subt_Indic
);
10154 if Nkind
(Constr
) = N_Index_Or_Discriminant_Constraint
then
10155 Assn
:= First
(Constraints
(Constr
));
10156 while Present
(Assn
) loop
10157 case Nkind
(Assn
) is
10160 | N_Subtype_Indication
10162 if Depends_On_Discriminant
(Assn
) then
10166 when N_Discriminant_Association
=>
10167 if Depends_On_Discriminant
(Expression
(Assn
)) then
10182 end Has_Discriminant_Dependent_Constraint
;
10184 --------------------------------------
10185 -- Has_Effectively_Volatile_Profile --
10186 --------------------------------------
10188 function Has_Effectively_Volatile_Profile
10189 (Subp_Id
: Entity_Id
) return Boolean
10191 Formal
: Entity_Id
;
10194 -- Inspect the formal parameters looking for an effectively volatile
10197 Formal
:= First_Formal
(Subp_Id
);
10198 while Present
(Formal
) loop
10199 if Is_Effectively_Volatile
(Etype
(Formal
)) then
10203 Next_Formal
(Formal
);
10206 -- Inspect the return type of functions
10208 if Ekind_In
(Subp_Id
, E_Function
, E_Generic_Function
)
10209 and then Is_Effectively_Volatile
(Etype
(Subp_Id
))
10215 end Has_Effectively_Volatile_Profile
;
10217 --------------------------
10218 -- Has_Enabled_Property --
10219 --------------------------
10221 function Has_Enabled_Property
10222 (Item_Id
: Entity_Id
;
10223 Property
: Name_Id
) return Boolean
10225 function Protected_Object_Has_Enabled_Property
return Boolean;
10226 -- Determine whether a protected object denoted by Item_Id has the
10227 -- property enabled.
10229 function State_Has_Enabled_Property
return Boolean;
10230 -- Determine whether a state denoted by Item_Id has the property enabled
10232 function Variable_Has_Enabled_Property
return Boolean;
10233 -- Determine whether a variable denoted by Item_Id has the property
10236 -------------------------------------------
10237 -- Protected_Object_Has_Enabled_Property --
10238 -------------------------------------------
10240 function Protected_Object_Has_Enabled_Property
return Boolean is
10241 Constits
: constant Elist_Id
:= Part_Of_Constituents
(Item_Id
);
10242 Constit_Elmt
: Elmt_Id
;
10243 Constit_Id
: Entity_Id
;
10246 -- Protected objects always have the properties Async_Readers and
10247 -- Async_Writers (SPARK RM 7.1.2(16)).
10249 if Property
= Name_Async_Readers
10250 or else Property
= Name_Async_Writers
10254 -- Protected objects that have Part_Of components also inherit their
10255 -- properties Effective_Reads and Effective_Writes
10256 -- (SPARK RM 7.1.2(16)).
10258 elsif Present
(Constits
) then
10259 Constit_Elmt
:= First_Elmt
(Constits
);
10260 while Present
(Constit_Elmt
) loop
10261 Constit_Id
:= Node
(Constit_Elmt
);
10263 if Has_Enabled_Property
(Constit_Id
, Property
) then
10267 Next_Elmt
(Constit_Elmt
);
10272 end Protected_Object_Has_Enabled_Property
;
10274 --------------------------------
10275 -- State_Has_Enabled_Property --
10276 --------------------------------
10278 function State_Has_Enabled_Property
return Boolean is
10279 Decl
: constant Node_Id
:= Parent
(Item_Id
);
10283 Prop_Nam
: Node_Id
;
10287 -- The declaration of an external abstract state appears as an
10288 -- extension aggregate. If this is not the case, properties can never
10291 if Nkind
(Decl
) /= N_Extension_Aggregate
then
10295 -- When External appears as a simple option, it automatically enables
10298 Opt
:= First
(Expressions
(Decl
));
10299 while Present
(Opt
) loop
10300 if Nkind
(Opt
) = N_Identifier
10301 and then Chars
(Opt
) = Name_External
10309 -- When External specifies particular properties, inspect those and
10310 -- find the desired one (if any).
10312 Opt
:= First
(Component_Associations
(Decl
));
10313 while Present
(Opt
) loop
10314 Opt_Nam
:= First
(Choices
(Opt
));
10316 if Nkind
(Opt_Nam
) = N_Identifier
10317 and then Chars
(Opt_Nam
) = Name_External
10319 Props
:= Expression
(Opt
);
10321 -- Multiple properties appear as an aggregate
10323 if Nkind
(Props
) = N_Aggregate
then
10325 -- Simple property form
10327 Prop
:= First
(Expressions
(Props
));
10328 while Present
(Prop
) loop
10329 if Chars
(Prop
) = Property
then
10336 -- Property with expression form
10338 Prop
:= First
(Component_Associations
(Props
));
10339 while Present
(Prop
) loop
10340 Prop_Nam
:= First
(Choices
(Prop
));
10342 -- The property can be represented in two ways:
10343 -- others => <value>
10344 -- <property> => <value>
10346 if Nkind
(Prop_Nam
) = N_Others_Choice
10347 or else (Nkind
(Prop_Nam
) = N_Identifier
10348 and then Chars
(Prop_Nam
) = Property
)
10350 return Is_True
(Expr_Value
(Expression
(Prop
)));
10359 return Chars
(Props
) = Property
;
10367 end State_Has_Enabled_Property
;
10369 -----------------------------------
10370 -- Variable_Has_Enabled_Property --
10371 -----------------------------------
10373 function Variable_Has_Enabled_Property
return Boolean is
10374 function Is_Enabled
(Prag
: Node_Id
) return Boolean;
10375 -- Determine whether property pragma Prag (if present) denotes an
10376 -- enabled property.
10382 function Is_Enabled
(Prag
: Node_Id
) return Boolean is
10386 if Present
(Prag
) then
10387 Arg1
:= First
(Pragma_Argument_Associations
(Prag
));
10389 -- The pragma has an optional Boolean expression, the related
10390 -- property is enabled only when the expression evaluates to
10393 if Present
(Arg1
) then
10394 return Is_True
(Expr_Value
(Get_Pragma_Arg
(Arg1
)));
10396 -- Otherwise the lack of expression enables the property by
10403 -- The property was never set in the first place
10412 AR
: constant Node_Id
:=
10413 Get_Pragma
(Item_Id
, Pragma_Async_Readers
);
10414 AW
: constant Node_Id
:=
10415 Get_Pragma
(Item_Id
, Pragma_Async_Writers
);
10416 ER
: constant Node_Id
:=
10417 Get_Pragma
(Item_Id
, Pragma_Effective_Reads
);
10418 EW
: constant Node_Id
:=
10419 Get_Pragma
(Item_Id
, Pragma_Effective_Writes
);
10421 -- Start of processing for Variable_Has_Enabled_Property
10424 -- A non-effectively volatile object can never possess external
10427 if not Is_Effectively_Volatile
(Item_Id
) then
10430 -- External properties related to variables come in two flavors -
10431 -- explicit and implicit. The explicit case is characterized by the
10432 -- presence of a property pragma with an optional Boolean flag. The
10433 -- property is enabled when the flag evaluates to True or the flag is
10434 -- missing altogether.
10436 elsif Property
= Name_Async_Readers
and then Is_Enabled
(AR
) then
10439 elsif Property
= Name_Async_Writers
and then Is_Enabled
(AW
) then
10442 elsif Property
= Name_Effective_Reads
and then Is_Enabled
(ER
) then
10445 elsif Property
= Name_Effective_Writes
and then Is_Enabled
(EW
) then
10448 -- The implicit case lacks all property pragmas
10450 elsif No
(AR
) and then No
(AW
) and then No
(ER
) and then No
(EW
) then
10451 if Is_Protected_Type
(Etype
(Item_Id
)) then
10452 return Protected_Object_Has_Enabled_Property
;
10460 end Variable_Has_Enabled_Property
;
10462 -- Start of processing for Has_Enabled_Property
10465 -- Abstract states and variables have a flexible scheme of specifying
10466 -- external properties.
10468 if Ekind
(Item_Id
) = E_Abstract_State
then
10469 return State_Has_Enabled_Property
;
10471 elsif Ekind
(Item_Id
) = E_Variable
then
10472 return Variable_Has_Enabled_Property
;
10474 -- By default, protected objects only have the properties Async_Readers
10475 -- and Async_Writers. If they have Part_Of components, they also inherit
10476 -- their properties Effective_Reads and Effective_Writes
10477 -- (SPARK RM 7.1.2(16)).
10479 elsif Ekind
(Item_Id
) = E_Protected_Object
then
10480 return Protected_Object_Has_Enabled_Property
;
10482 -- Otherwise a property is enabled when the related item is effectively
10486 return Is_Effectively_Volatile
(Item_Id
);
10488 end Has_Enabled_Property
;
10490 -------------------------------------
10491 -- Has_Full_Default_Initialization --
10492 -------------------------------------
10494 function Has_Full_Default_Initialization
(Typ
: Entity_Id
) return Boolean is
10498 -- A type subject to pragma Default_Initial_Condition may be fully
10499 -- default initialized depending on inheritance and the argument of
10500 -- the pragma. Since any type may act as the full view of a private
10501 -- type, this check must be performed prior to the specialized tests
10504 if Has_Fully_Default_Initializing_DIC_Pragma
(Typ
) then
10508 -- A scalar type is fully default initialized if it is subject to aspect
10511 if Is_Scalar_Type
(Typ
) then
10512 return Has_Default_Aspect
(Typ
);
10514 -- An array type is fully default initialized if its element type is
10515 -- scalar and the array type carries aspect Default_Component_Value or
10516 -- the element type is fully default initialized.
10518 elsif Is_Array_Type
(Typ
) then
10520 Has_Default_Aspect
(Typ
)
10521 or else Has_Full_Default_Initialization
(Component_Type
(Typ
));
10523 -- A protected type, record type, or type extension is fully default
10524 -- initialized if all its components either carry an initialization
10525 -- expression or have a type that is fully default initialized. The
10526 -- parent type of a type extension must be fully default initialized.
10528 elsif Is_Record_Type
(Typ
) or else Is_Protected_Type
(Typ
) then
10530 -- Inspect all entities defined in the scope of the type, looking for
10531 -- uninitialized components.
10533 Comp
:= First_Entity
(Typ
);
10534 while Present
(Comp
) loop
10535 if Ekind
(Comp
) = E_Component
10536 and then Comes_From_Source
(Comp
)
10537 and then No
(Expression
(Parent
(Comp
)))
10538 and then not Has_Full_Default_Initialization
(Etype
(Comp
))
10543 Next_Entity
(Comp
);
10546 -- Ensure that the parent type of a type extension is fully default
10549 if Etype
(Typ
) /= Typ
10550 and then not Has_Full_Default_Initialization
(Etype
(Typ
))
10555 -- If we get here, then all components and parent portion are fully
10556 -- default initialized.
10560 -- A task type is fully default initialized by default
10562 elsif Is_Task_Type
(Typ
) then
10565 -- Otherwise the type is not fully default initialized
10570 end Has_Full_Default_Initialization
;
10572 -----------------------------------------------
10573 -- Has_Fully_Default_Initializing_DIC_Pragma --
10574 -----------------------------------------------
10576 function Has_Fully_Default_Initializing_DIC_Pragma
10577 (Typ
: Entity_Id
) return Boolean
10583 -- A type that inherits pragma Default_Initial_Condition from a parent
10584 -- type is automatically fully default initialized.
10586 if Has_Inherited_DIC
(Typ
) then
10589 -- Otherwise the type is fully default initialized only when the pragma
10590 -- appears without an argument, or the argument is non-null.
10592 elsif Has_Own_DIC
(Typ
) then
10593 Prag
:= Get_Pragma
(Typ
, Pragma_Default_Initial_Condition
);
10594 pragma Assert
(Present
(Prag
));
10595 Args
:= Pragma_Argument_Associations
(Prag
);
10597 -- The pragma appears without an argument in which case it defaults
10603 -- The pragma appears with a non-null expression
10605 elsif Nkind
(Get_Pragma_Arg
(First
(Args
))) /= N_Null
then
10611 end Has_Fully_Default_Initializing_DIC_Pragma
;
10613 --------------------
10614 -- Has_Infinities --
10615 --------------------
10617 function Has_Infinities
(E
: Entity_Id
) return Boolean is
10620 Is_Floating_Point_Type
(E
)
10621 and then Nkind
(Scalar_Range
(E
)) = N_Range
10622 and then Includes_Infinities
(Scalar_Range
(E
));
10623 end Has_Infinities
;
10625 --------------------
10626 -- Has_Interfaces --
10627 --------------------
10629 function Has_Interfaces
10631 Use_Full_View
: Boolean := True) return Boolean
10633 Typ
: Entity_Id
:= Base_Type
(T
);
10636 -- Handle concurrent types
10638 if Is_Concurrent_Type
(Typ
) then
10639 Typ
:= Corresponding_Record_Type
(Typ
);
10642 if not Present
(Typ
)
10643 or else not Is_Record_Type
(Typ
)
10644 or else not Is_Tagged_Type
(Typ
)
10649 -- Handle private types
10651 if Use_Full_View
and then Present
(Full_View
(Typ
)) then
10652 Typ
:= Full_View
(Typ
);
10655 -- Handle concurrent record types
10657 if Is_Concurrent_Record_Type
(Typ
)
10658 and then Is_Non_Empty_List
(Abstract_Interface_List
(Typ
))
10664 if Is_Interface
(Typ
)
10666 (Is_Record_Type
(Typ
)
10667 and then Present
(Interfaces
(Typ
))
10668 and then not Is_Empty_Elmt_List
(Interfaces
(Typ
)))
10673 exit when Etype
(Typ
) = Typ
10675 -- Handle private types
10677 or else (Present
(Full_View
(Etype
(Typ
)))
10678 and then Full_View
(Etype
(Typ
)) = Typ
)
10680 -- Protect frontend against wrong sources with cyclic derivations
10682 or else Etype
(Typ
) = T
;
10684 -- Climb to the ancestor type handling private types
10686 if Present
(Full_View
(Etype
(Typ
))) then
10687 Typ
:= Full_View
(Etype
(Typ
));
10689 Typ
:= Etype
(Typ
);
10694 end Has_Interfaces
;
10696 --------------------------
10697 -- Has_Max_Queue_Length --
10698 --------------------------
10700 function Has_Max_Queue_Length
(Id
: Entity_Id
) return Boolean is
10703 Ekind
(Id
) = E_Entry
10704 and then Present
(Get_Pragma
(Id
, Pragma_Max_Queue_Length
));
10705 end Has_Max_Queue_Length
;
10707 ---------------------------------
10708 -- Has_No_Obvious_Side_Effects --
10709 ---------------------------------
10711 function Has_No_Obvious_Side_Effects
(N
: Node_Id
) return Boolean is
10713 -- For now handle literals, constants, and non-volatile variables and
10714 -- expressions combining these with operators or short circuit forms.
10716 if Nkind
(N
) in N_Numeric_Or_String_Literal
then
10719 elsif Nkind
(N
) = N_Character_Literal
then
10722 elsif Nkind
(N
) in N_Unary_Op
then
10723 return Has_No_Obvious_Side_Effects
(Right_Opnd
(N
));
10725 elsif Nkind
(N
) in N_Binary_Op
or else Nkind
(N
) in N_Short_Circuit
then
10726 return Has_No_Obvious_Side_Effects
(Left_Opnd
(N
))
10728 Has_No_Obvious_Side_Effects
(Right_Opnd
(N
));
10730 elsif Nkind
(N
) = N_Expression_With_Actions
10731 and then Is_Empty_List
(Actions
(N
))
10733 return Has_No_Obvious_Side_Effects
(Expression
(N
));
10735 elsif Nkind
(N
) in N_Has_Entity
then
10736 return Present
(Entity
(N
))
10737 and then Ekind_In
(Entity
(N
), E_Variable
,
10739 E_Enumeration_Literal
,
10742 E_In_Out_Parameter
)
10743 and then not Is_Volatile
(Entity
(N
));
10748 end Has_No_Obvious_Side_Effects
;
10750 -----------------------------
10751 -- Has_Non_Null_Refinement --
10752 -----------------------------
10754 function Has_Non_Null_Refinement
(Id
: Entity_Id
) return Boolean is
10755 Constits
: Elist_Id
;
10758 pragma Assert
(Ekind
(Id
) = E_Abstract_State
);
10759 Constits
:= Refinement_Constituents
(Id
);
10761 -- For a refinement to be non-null, the first constituent must be
10762 -- anything other than null.
10766 and then Nkind
(Node
(First_Elmt
(Constits
))) /= N_Null
;
10767 end Has_Non_Null_Refinement
;
10769 -----------------------------
10770 -- Has_Non_Null_Statements --
10771 -----------------------------
10773 function Has_Non_Null_Statements
(L
: List_Id
) return Boolean is
10777 if Is_Non_Empty_List
(L
) then
10781 if Nkind
(Node
) /= N_Null_Statement
then
10786 exit when Node
= Empty
;
10791 end Has_Non_Null_Statements
;
10793 ----------------------------------
10794 -- Has_Non_Trivial_Precondition --
10795 ----------------------------------
10797 function Has_Non_Trivial_Precondition
(Subp
: Entity_Id
) return Boolean is
10798 Pre
: constant Node_Id
:= Find_Aspect
(Subp
, Aspect_Pre
);
10803 and then Class_Present
(Pre
)
10804 and then not Is_Entity_Name
(Expression
(Pre
));
10805 end Has_Non_Trivial_Precondition
;
10807 -------------------
10808 -- Has_Null_Body --
10809 -------------------
10811 function Has_Null_Body
(Proc_Id
: Entity_Id
) return Boolean is
10812 Body_Id
: Entity_Id
;
10819 Spec
:= Parent
(Proc_Id
);
10820 Decl
:= Parent
(Spec
);
10822 -- Retrieve the entity of the procedure body (e.g. invariant proc).
10824 if Nkind
(Spec
) = N_Procedure_Specification
10825 and then Nkind
(Decl
) = N_Subprogram_Declaration
10827 Body_Id
:= Corresponding_Body
(Decl
);
10829 -- The body acts as a spec
10832 Body_Id
:= Proc_Id
;
10835 -- The body will be generated later
10837 if No
(Body_Id
) then
10841 Spec
:= Parent
(Body_Id
);
10842 Decl
:= Parent
(Spec
);
10845 (Nkind
(Spec
) = N_Procedure_Specification
10846 and then Nkind
(Decl
) = N_Subprogram_Body
);
10848 Stmt1
:= First
(Statements
(Handled_Statement_Sequence
(Decl
)));
10850 -- Look for a null statement followed by an optional return
10853 if Nkind
(Stmt1
) = N_Null_Statement
then
10854 Stmt2
:= Next
(Stmt1
);
10856 if Present
(Stmt2
) then
10857 return Nkind
(Stmt2
) = N_Simple_Return_Statement
;
10866 ------------------------
10867 -- Has_Null_Exclusion --
10868 ------------------------
10870 function Has_Null_Exclusion
(N
: Node_Id
) return Boolean is
10873 when N_Access_Definition
10874 | N_Access_Function_Definition
10875 | N_Access_Procedure_Definition
10876 | N_Access_To_Object_Definition
10878 | N_Derived_Type_Definition
10879 | N_Function_Specification
10880 | N_Subtype_Declaration
10882 return Null_Exclusion_Present
(N
);
10884 when N_Component_Definition
10885 | N_Formal_Object_Declaration
10886 | N_Object_Renaming_Declaration
10888 if Present
(Subtype_Mark
(N
)) then
10889 return Null_Exclusion_Present
(N
);
10890 else pragma Assert
(Present
(Access_Definition
(N
)));
10891 return Null_Exclusion_Present
(Access_Definition
(N
));
10894 when N_Discriminant_Specification
=>
10895 if Nkind
(Discriminant_Type
(N
)) = N_Access_Definition
then
10896 return Null_Exclusion_Present
(Discriminant_Type
(N
));
10898 return Null_Exclusion_Present
(N
);
10901 when N_Object_Declaration
=>
10902 if Nkind
(Object_Definition
(N
)) = N_Access_Definition
then
10903 return Null_Exclusion_Present
(Object_Definition
(N
));
10905 return Null_Exclusion_Present
(N
);
10908 when N_Parameter_Specification
=>
10909 if Nkind
(Parameter_Type
(N
)) = N_Access_Definition
then
10910 return Null_Exclusion_Present
(Parameter_Type
(N
));
10912 return Null_Exclusion_Present
(N
);
10918 end Has_Null_Exclusion
;
10920 ------------------------
10921 -- Has_Null_Extension --
10922 ------------------------
10924 function Has_Null_Extension
(T
: Entity_Id
) return Boolean is
10925 B
: constant Entity_Id
:= Base_Type
(T
);
10930 if Nkind
(Parent
(B
)) = N_Full_Type_Declaration
10931 and then Present
(Record_Extension_Part
(Type_Definition
(Parent
(B
))))
10933 Ext
:= Record_Extension_Part
(Type_Definition
(Parent
(B
)));
10935 if Present
(Ext
) then
10936 if Null_Present
(Ext
) then
10939 Comps
:= Component_List
(Ext
);
10941 -- The null component list is rewritten during analysis to
10942 -- include the parent component. Any other component indicates
10943 -- that the extension was not originally null.
10945 return Null_Present
(Comps
)
10946 or else No
(Next
(First
(Component_Items
(Comps
))));
10955 end Has_Null_Extension
;
10957 -------------------------
10958 -- Has_Null_Refinement --
10959 -------------------------
10961 function Has_Null_Refinement
(Id
: Entity_Id
) return Boolean is
10962 Constits
: Elist_Id
;
10965 pragma Assert
(Ekind
(Id
) = E_Abstract_State
);
10966 Constits
:= Refinement_Constituents
(Id
);
10968 -- For a refinement to be null, the state's sole constituent must be a
10973 and then Nkind
(Node
(First_Elmt
(Constits
))) = N_Null
;
10974 end Has_Null_Refinement
;
10976 -------------------------------
10977 -- Has_Overriding_Initialize --
10978 -------------------------------
10980 function Has_Overriding_Initialize
(T
: Entity_Id
) return Boolean is
10981 BT
: constant Entity_Id
:= Base_Type
(T
);
10985 if Is_Controlled
(BT
) then
10986 if Is_RTU
(Scope
(BT
), Ada_Finalization
) then
10989 elsif Present
(Primitive_Operations
(BT
)) then
10990 P
:= First_Elmt
(Primitive_Operations
(BT
));
10991 while Present
(P
) loop
10993 Init
: constant Entity_Id
:= Node
(P
);
10994 Formal
: constant Entity_Id
:= First_Formal
(Init
);
10996 if Ekind
(Init
) = E_Procedure
10997 and then Chars
(Init
) = Name_Initialize
10998 and then Comes_From_Source
(Init
)
10999 and then Present
(Formal
)
11000 and then Etype
(Formal
) = BT
11001 and then No
(Next_Formal
(Formal
))
11002 and then (Ada_Version
< Ada_2012
11003 or else not Null_Present
(Parent
(Init
)))
11013 -- Here if type itself does not have a non-null Initialize operation:
11014 -- check immediate ancestor.
11016 if Is_Derived_Type
(BT
)
11017 and then Has_Overriding_Initialize
(Etype
(BT
))
11024 end Has_Overriding_Initialize
;
11026 --------------------------------------
11027 -- Has_Preelaborable_Initialization --
11028 --------------------------------------
11030 function Has_Preelaborable_Initialization
(E
: Entity_Id
) return Boolean is
11033 procedure Check_Components
(E
: Entity_Id
);
11034 -- Check component/discriminant chain, sets Has_PE False if a component
11035 -- or discriminant does not meet the preelaborable initialization rules.
11037 ----------------------
11038 -- Check_Components --
11039 ----------------------
11041 procedure Check_Components
(E
: Entity_Id
) is
11046 -- Loop through entities of record or protected type
11049 while Present
(Ent
) loop
11051 -- We are interested only in components and discriminants
11055 case Ekind
(Ent
) is
11056 when E_Component
=>
11058 -- Get default expression if any. If there is no declaration
11059 -- node, it means we have an internal entity. The parent and
11060 -- tag fields are examples of such entities. For such cases,
11061 -- we just test the type of the entity.
11063 if Present
(Declaration_Node
(Ent
)) then
11064 Exp
:= Expression
(Declaration_Node
(Ent
));
11067 when E_Discriminant
=>
11069 -- Note: for a renamed discriminant, the Declaration_Node
11070 -- may point to the one from the ancestor, and have a
11071 -- different expression, so use the proper attribute to
11072 -- retrieve the expression from the derived constraint.
11074 Exp
:= Discriminant_Default_Value
(Ent
);
11077 goto Check_Next_Entity
;
11080 -- A component has PI if it has no default expression and the
11081 -- component type has PI.
11084 if not Has_Preelaborable_Initialization
(Etype
(Ent
)) then
11089 -- Require the default expression to be preelaborable
11091 elsif not Is_Preelaborable_Construct
(Exp
) then
11096 <<Check_Next_Entity
>>
11099 end Check_Components
;
11101 -- Start of processing for Has_Preelaborable_Initialization
11104 -- Immediate return if already marked as known preelaborable init. This
11105 -- covers types for which this function has already been called once
11106 -- and returned True (in which case the result is cached), and also
11107 -- types to which a pragma Preelaborable_Initialization applies.
11109 if Known_To_Have_Preelab_Init
(E
) then
11113 -- If the type is a subtype representing a generic actual type, then
11114 -- test whether its base type has preelaborable initialization since
11115 -- the subtype representing the actual does not inherit this attribute
11116 -- from the actual or formal. (but maybe it should???)
11118 if Is_Generic_Actual_Type
(E
) then
11119 return Has_Preelaborable_Initialization
(Base_Type
(E
));
11122 -- All elementary types have preelaborable initialization
11124 if Is_Elementary_Type
(E
) then
11127 -- Array types have PI if the component type has PI
11129 elsif Is_Array_Type
(E
) then
11130 Has_PE
:= Has_Preelaborable_Initialization
(Component_Type
(E
));
11132 -- A derived type has preelaborable initialization if its parent type
11133 -- has preelaborable initialization and (in the case of a derived record
11134 -- extension) if the non-inherited components all have preelaborable
11135 -- initialization. However, a user-defined controlled type with an
11136 -- overriding Initialize procedure does not have preelaborable
11139 elsif Is_Derived_Type
(E
) then
11141 -- If the derived type is a private extension then it doesn't have
11142 -- preelaborable initialization.
11144 if Ekind
(Base_Type
(E
)) = E_Record_Type_With_Private
then
11148 -- First check whether ancestor type has preelaborable initialization
11150 Has_PE
:= Has_Preelaborable_Initialization
(Etype
(Base_Type
(E
)));
11152 -- If OK, check extension components (if any)
11154 if Has_PE
and then Is_Record_Type
(E
) then
11155 Check_Components
(First_Entity
(E
));
11158 -- Check specifically for 10.2.1(11.4/2) exception: a controlled type
11159 -- with a user defined Initialize procedure does not have PI. If
11160 -- the type is untagged, the control primitives come from a component
11161 -- that has already been checked.
11164 and then Is_Controlled
(E
)
11165 and then Is_Tagged_Type
(E
)
11166 and then Has_Overriding_Initialize
(E
)
11171 -- Private types not derived from a type having preelaborable init and
11172 -- that are not marked with pragma Preelaborable_Initialization do not
11173 -- have preelaborable initialization.
11175 elsif Is_Private_Type
(E
) then
11178 -- Record type has PI if it is non private and all components have PI
11180 elsif Is_Record_Type
(E
) then
11182 Check_Components
(First_Entity
(E
));
11184 -- Protected types must not have entries, and components must meet
11185 -- same set of rules as for record components.
11187 elsif Is_Protected_Type
(E
) then
11188 if Has_Entries
(E
) then
11192 Check_Components
(First_Entity
(E
));
11193 Check_Components
(First_Private_Entity
(E
));
11196 -- Type System.Address always has preelaborable initialization
11198 elsif Is_RTE
(E
, RE_Address
) then
11201 -- In all other cases, type does not have preelaborable initialization
11207 -- If type has preelaborable initialization, cache result
11210 Set_Known_To_Have_Preelab_Init
(E
);
11214 end Has_Preelaborable_Initialization
;
11216 ---------------------------
11217 -- Has_Private_Component --
11218 ---------------------------
11220 function Has_Private_Component
(Type_Id
: Entity_Id
) return Boolean is
11221 Btype
: Entity_Id
:= Base_Type
(Type_Id
);
11222 Component
: Entity_Id
;
11225 if Error_Posted
(Type_Id
)
11226 or else Error_Posted
(Btype
)
11231 if Is_Class_Wide_Type
(Btype
) then
11232 Btype
:= Root_Type
(Btype
);
11235 if Is_Private_Type
(Btype
) then
11237 UT
: constant Entity_Id
:= Underlying_Type
(Btype
);
11240 if No
(Full_View
(Btype
)) then
11241 return not Is_Generic_Type
(Btype
)
11243 not Is_Generic_Type
(Root_Type
(Btype
));
11245 return not Is_Generic_Type
(Root_Type
(Full_View
(Btype
)));
11248 return not Is_Frozen
(UT
) and then Has_Private_Component
(UT
);
11252 elsif Is_Array_Type
(Btype
) then
11253 return Has_Private_Component
(Component_Type
(Btype
));
11255 elsif Is_Record_Type
(Btype
) then
11256 Component
:= First_Component
(Btype
);
11257 while Present
(Component
) loop
11258 if Has_Private_Component
(Etype
(Component
)) then
11262 Next_Component
(Component
);
11267 elsif Is_Protected_Type
(Btype
)
11268 and then Present
(Corresponding_Record_Type
(Btype
))
11270 return Has_Private_Component
(Corresponding_Record_Type
(Btype
));
11275 end Has_Private_Component
;
11277 ----------------------
11278 -- Has_Signed_Zeros --
11279 ----------------------
11281 function Has_Signed_Zeros
(E
: Entity_Id
) return Boolean is
11283 return Is_Floating_Point_Type
(E
) and then Signed_Zeros_On_Target
;
11284 end Has_Signed_Zeros
;
11286 ------------------------------
11287 -- Has_Significant_Contract --
11288 ------------------------------
11290 function Has_Significant_Contract
(Subp_Id
: Entity_Id
) return Boolean is
11291 Subp_Nam
: constant Name_Id
:= Chars
(Subp_Id
);
11294 -- _Finalizer procedure
11296 if Subp_Nam
= Name_uFinalizer
then
11299 -- _Postconditions procedure
11301 elsif Subp_Nam
= Name_uPostconditions
then
11304 -- Predicate function
11306 elsif Ekind
(Subp_Id
) = E_Function
11307 and then Is_Predicate_Function
(Subp_Id
)
11313 elsif Get_TSS_Name
(Subp_Id
) /= TSS_Null
then
11319 end Has_Significant_Contract
;
11321 -----------------------------
11322 -- Has_Static_Array_Bounds --
11323 -----------------------------
11325 function Has_Static_Array_Bounds
(Typ
: Node_Id
) return Boolean is
11326 Ndims
: constant Nat
:= Number_Dimensions
(Typ
);
11333 -- Unconstrained types do not have static bounds
11335 if not Is_Constrained
(Typ
) then
11339 -- First treat string literals specially, as the lower bound and length
11340 -- of string literals are not stored like those of arrays.
11342 -- A string literal always has static bounds
11344 if Ekind
(Typ
) = E_String_Literal_Subtype
then
11348 -- Treat all dimensions in turn
11350 Index
:= First_Index
(Typ
);
11351 for Indx
in 1 .. Ndims
loop
11353 -- In case of an illegal index which is not a discrete type, return
11354 -- that the type is not static.
11356 if not Is_Discrete_Type
(Etype
(Index
))
11357 or else Etype
(Index
) = Any_Type
11362 Get_Index_Bounds
(Index
, Low
, High
);
11364 if Error_Posted
(Low
) or else Error_Posted
(High
) then
11368 if Is_OK_Static_Expression
(Low
)
11370 Is_OK_Static_Expression
(High
)
11380 -- If we fall through the loop, all indexes matched
11383 end Has_Static_Array_Bounds
;
11389 function Has_Stream
(T
: Entity_Id
) return Boolean is
11396 elsif Is_RTE
(Root_Type
(T
), RE_Root_Stream_Type
) then
11399 elsif Is_Array_Type
(T
) then
11400 return Has_Stream
(Component_Type
(T
));
11402 elsif Is_Record_Type
(T
) then
11403 E
:= First_Component
(T
);
11404 while Present
(E
) loop
11405 if Has_Stream
(Etype
(E
)) then
11408 Next_Component
(E
);
11414 elsif Is_Private_Type
(T
) then
11415 return Has_Stream
(Underlying_Type
(T
));
11426 function Has_Suffix
(E
: Entity_Id
; Suffix
: Character) return Boolean is
11428 Get_Name_String
(Chars
(E
));
11429 return Name_Buffer
(Name_Len
) = Suffix
;
11436 function Add_Suffix
(E
: Entity_Id
; Suffix
: Character) return Name_Id
is
11438 Get_Name_String
(Chars
(E
));
11439 Add_Char_To_Name_Buffer
(Suffix
);
11443 -------------------
11444 -- Remove_Suffix --
11445 -------------------
11447 function Remove_Suffix
(E
: Entity_Id
; Suffix
: Character) return Name_Id
is
11449 pragma Assert
(Has_Suffix
(E
, Suffix
));
11450 Get_Name_String
(Chars
(E
));
11451 Name_Len
:= Name_Len
- 1;
11455 ----------------------------------
11456 -- Replace_Null_By_Null_Address --
11457 ----------------------------------
11459 procedure Replace_Null_By_Null_Address
(N
: Node_Id
) is
11460 procedure Replace_Null_Operand
(Op
: Node_Id
; Other_Op
: Node_Id
);
11461 -- Replace operand Op with a reference to Null_Address when the operand
11462 -- denotes a null Address. Other_Op denotes the other operand.
11464 --------------------------
11465 -- Replace_Null_Operand --
11466 --------------------------
11468 procedure Replace_Null_Operand
(Op
: Node_Id
; Other_Op
: Node_Id
) is
11470 -- Check the type of the complementary operand since the N_Null node
11471 -- has not been decorated yet.
11473 if Nkind
(Op
) = N_Null
11474 and then Is_Descendant_Of_Address
(Etype
(Other_Op
))
11476 Rewrite
(Op
, New_Occurrence_Of
(RTE
(RE_Null_Address
), Sloc
(Op
)));
11478 end Replace_Null_Operand
;
11480 -- Start of processing for Replace_Null_By_Null_Address
11483 pragma Assert
(Relaxed_RM_Semantics
);
11484 pragma Assert
(Nkind_In
(N
, N_Null
,
11492 if Nkind
(N
) = N_Null
then
11493 Rewrite
(N
, New_Occurrence_Of
(RTE
(RE_Null_Address
), Sloc
(N
)));
11497 L
: constant Node_Id
:= Left_Opnd
(N
);
11498 R
: constant Node_Id
:= Right_Opnd
(N
);
11501 Replace_Null_Operand
(L
, Other_Op
=> R
);
11502 Replace_Null_Operand
(R
, Other_Op
=> L
);
11505 end Replace_Null_By_Null_Address
;
11507 --------------------------
11508 -- Has_Tagged_Component --
11509 --------------------------
11511 function Has_Tagged_Component
(Typ
: Entity_Id
) return Boolean is
11515 if Is_Private_Type
(Typ
) and then Present
(Underlying_Type
(Typ
)) then
11516 return Has_Tagged_Component
(Underlying_Type
(Typ
));
11518 elsif Is_Array_Type
(Typ
) then
11519 return Has_Tagged_Component
(Component_Type
(Typ
));
11521 elsif Is_Tagged_Type
(Typ
) then
11524 elsif Is_Record_Type
(Typ
) then
11525 Comp
:= First_Component
(Typ
);
11526 while Present
(Comp
) loop
11527 if Has_Tagged_Component
(Etype
(Comp
)) then
11531 Next_Component
(Comp
);
11539 end Has_Tagged_Component
;
11541 -----------------------------
11542 -- Has_Undefined_Reference --
11543 -----------------------------
11545 function Has_Undefined_Reference
(Expr
: Node_Id
) return Boolean is
11546 Has_Undef_Ref
: Boolean := False;
11547 -- Flag set when expression Expr contains at least one undefined
11550 function Is_Undefined_Reference
(N
: Node_Id
) return Traverse_Result
;
11551 -- Determine whether N denotes a reference and if it does, whether it is
11554 ----------------------------
11555 -- Is_Undefined_Reference --
11556 ----------------------------
11558 function Is_Undefined_Reference
(N
: Node_Id
) return Traverse_Result
is
11560 if Is_Entity_Name
(N
)
11561 and then Present
(Entity
(N
))
11562 and then Entity
(N
) = Any_Id
11564 Has_Undef_Ref
:= True;
11569 end Is_Undefined_Reference
;
11571 procedure Find_Undefined_References
is
11572 new Traverse_Proc
(Is_Undefined_Reference
);
11574 -- Start of processing for Has_Undefined_Reference
11577 Find_Undefined_References
(Expr
);
11579 return Has_Undef_Ref
;
11580 end Has_Undefined_Reference
;
11582 ----------------------------
11583 -- Has_Volatile_Component --
11584 ----------------------------
11586 function Has_Volatile_Component
(Typ
: Entity_Id
) return Boolean is
11590 if Has_Volatile_Components
(Typ
) then
11593 elsif Is_Array_Type
(Typ
) then
11594 return Is_Volatile
(Component_Type
(Typ
));
11596 elsif Is_Record_Type
(Typ
) then
11597 Comp
:= First_Component
(Typ
);
11598 while Present
(Comp
) loop
11599 if Is_Volatile_Object
(Comp
) then
11603 Comp
:= Next_Component
(Comp
);
11608 end Has_Volatile_Component
;
11610 -------------------------
11611 -- Implementation_Kind --
11612 -------------------------
11614 function Implementation_Kind
(Subp
: Entity_Id
) return Name_Id
is
11615 Impl_Prag
: constant Node_Id
:= Get_Rep_Pragma
(Subp
, Name_Implemented
);
11618 pragma Assert
(Present
(Impl_Prag
));
11619 Arg
:= Last
(Pragma_Argument_Associations
(Impl_Prag
));
11620 return Chars
(Get_Pragma_Arg
(Arg
));
11621 end Implementation_Kind
;
11623 --------------------------
11624 -- Implements_Interface --
11625 --------------------------
11627 function Implements_Interface
11628 (Typ_Ent
: Entity_Id
;
11629 Iface_Ent
: Entity_Id
;
11630 Exclude_Parents
: Boolean := False) return Boolean
11632 Ifaces_List
: Elist_Id
;
11634 Iface
: Entity_Id
:= Base_Type
(Iface_Ent
);
11635 Typ
: Entity_Id
:= Base_Type
(Typ_Ent
);
11638 if Is_Class_Wide_Type
(Typ
) then
11639 Typ
:= Root_Type
(Typ
);
11642 if not Has_Interfaces
(Typ
) then
11646 if Is_Class_Wide_Type
(Iface
) then
11647 Iface
:= Root_Type
(Iface
);
11650 Collect_Interfaces
(Typ
, Ifaces_List
);
11652 Elmt
:= First_Elmt
(Ifaces_List
);
11653 while Present
(Elmt
) loop
11654 if Is_Ancestor
(Node
(Elmt
), Typ
, Use_Full_View
=> True)
11655 and then Exclude_Parents
11659 elsif Node
(Elmt
) = Iface
then
11667 end Implements_Interface
;
11669 ------------------------------------
11670 -- In_Assertion_Expression_Pragma --
11671 ------------------------------------
11673 function In_Assertion_Expression_Pragma
(N
: Node_Id
) return Boolean is
11675 Prag
: Node_Id
:= Empty
;
11678 -- Climb the parent chain looking for an enclosing pragma
11681 while Present
(Par
) loop
11682 if Nkind
(Par
) = N_Pragma
then
11686 -- Precondition-like pragmas are expanded into if statements, check
11687 -- the original node instead.
11689 elsif Nkind
(Original_Node
(Par
)) = N_Pragma
then
11690 Prag
:= Original_Node
(Par
);
11693 -- The expansion of attribute 'Old generates a constant to capture
11694 -- the result of the prefix. If the parent traversal reaches
11695 -- one of these constants, then the node technically came from a
11696 -- postcondition-like pragma. Note that the Ekind is not tested here
11697 -- because N may be the expression of an object declaration which is
11698 -- currently being analyzed. Such objects carry Ekind of E_Void.
11700 elsif Nkind
(Par
) = N_Object_Declaration
11701 and then Constant_Present
(Par
)
11702 and then Stores_Attribute_Old_Prefix
(Defining_Entity
(Par
))
11706 -- Prevent the search from going too far
11708 elsif Is_Body_Or_Package_Declaration
(Par
) then
11712 Par
:= Parent
(Par
);
11717 and then Assertion_Expression_Pragma
(Get_Pragma_Id
(Prag
));
11718 end In_Assertion_Expression_Pragma
;
11720 ----------------------
11721 -- In_Generic_Scope --
11722 ----------------------
11724 function In_Generic_Scope
(E
: Entity_Id
) return Boolean is
11729 while Present
(S
) and then S
/= Standard_Standard
loop
11730 if Is_Generic_Unit
(S
) then
11738 end In_Generic_Scope
;
11744 function In_Instance
return Boolean is
11745 Curr_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
11749 S
:= Current_Scope
;
11750 while Present
(S
) and then S
/= Standard_Standard
loop
11751 if Is_Generic_Instance
(S
) then
11753 -- A child instance is always compiled in the context of a parent
11754 -- instance. Nevertheless, the actuals are not analyzed in an
11755 -- instance context. We detect this case by examining the current
11756 -- compilation unit, which must be a child instance, and checking
11757 -- that it is not currently on the scope stack.
11759 if Is_Child_Unit
(Curr_Unit
)
11760 and then Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) =
11761 N_Package_Instantiation
11762 and then not In_Open_Scopes
(Curr_Unit
)
11776 ----------------------
11777 -- In_Instance_Body --
11778 ----------------------
11780 function In_Instance_Body
return Boolean is
11784 S
:= Current_Scope
;
11785 while Present
(S
) and then S
/= Standard_Standard
loop
11786 if Ekind_In
(S
, E_Function
, E_Procedure
)
11787 and then Is_Generic_Instance
(S
)
11791 elsif Ekind
(S
) = E_Package
11792 and then In_Package_Body
(S
)
11793 and then Is_Generic_Instance
(S
)
11802 end In_Instance_Body
;
11804 -----------------------------
11805 -- In_Instance_Not_Visible --
11806 -----------------------------
11808 function In_Instance_Not_Visible
return Boolean is
11812 S
:= Current_Scope
;
11813 while Present
(S
) and then S
/= Standard_Standard
loop
11814 if Ekind_In
(S
, E_Function
, E_Procedure
)
11815 and then Is_Generic_Instance
(S
)
11819 elsif Ekind
(S
) = E_Package
11820 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
11821 and then Is_Generic_Instance
(S
)
11830 end In_Instance_Not_Visible
;
11832 ------------------------------
11833 -- In_Instance_Visible_Part --
11834 ------------------------------
11836 function In_Instance_Visible_Part
11837 (Id
: Entity_Id
:= Current_Scope
) return Boolean
11843 while Present
(Inst
) and then Inst
/= Standard_Standard
loop
11844 if Ekind
(Inst
) = E_Package
11845 and then Is_Generic_Instance
(Inst
)
11846 and then not In_Package_Body
(Inst
)
11847 and then not In_Private_Part
(Inst
)
11852 Inst
:= Scope
(Inst
);
11856 end In_Instance_Visible_Part
;
11858 ---------------------
11859 -- In_Package_Body --
11860 ---------------------
11862 function In_Package_Body
return Boolean is
11866 S
:= Current_Scope
;
11867 while Present
(S
) and then S
/= Standard_Standard
loop
11868 if Ekind
(S
) = E_Package
and then In_Package_Body
(S
) then
11876 end In_Package_Body
;
11878 --------------------------
11879 -- In_Pragma_Expression --
11880 --------------------------
11882 function In_Pragma_Expression
(N
: Node_Id
; Nam
: Name_Id
) return Boolean is
11889 elsif Nkind
(P
) = N_Pragma
and then Pragma_Name
(P
) = Nam
then
11895 end In_Pragma_Expression
;
11897 ---------------------------
11898 -- In_Pre_Post_Condition --
11899 ---------------------------
11901 function In_Pre_Post_Condition
(N
: Node_Id
) return Boolean is
11903 Prag
: Node_Id
:= Empty
;
11904 Prag_Id
: Pragma_Id
;
11907 -- Climb the parent chain looking for an enclosing pragma
11910 while Present
(Par
) loop
11911 if Nkind
(Par
) = N_Pragma
then
11915 -- Prevent the search from going too far
11917 elsif Is_Body_Or_Package_Declaration
(Par
) then
11921 Par
:= Parent
(Par
);
11924 if Present
(Prag
) then
11925 Prag_Id
:= Get_Pragma_Id
(Prag
);
11928 Prag_Id
= Pragma_Post
11929 or else Prag_Id
= Pragma_Post_Class
11930 or else Prag_Id
= Pragma_Postcondition
11931 or else Prag_Id
= Pragma_Pre
11932 or else Prag_Id
= Pragma_Pre_Class
11933 or else Prag_Id
= Pragma_Precondition
;
11935 -- Otherwise the node is not enclosed by a pre/postcondition pragma
11940 end In_Pre_Post_Condition
;
11942 -------------------------------------
11943 -- In_Reverse_Storage_Order_Object --
11944 -------------------------------------
11946 function In_Reverse_Storage_Order_Object
(N
: Node_Id
) return Boolean is
11948 Btyp
: Entity_Id
:= Empty
;
11951 -- Climb up indexed components
11955 case Nkind
(Pref
) is
11956 when N_Selected_Component
=>
11957 Pref
:= Prefix
(Pref
);
11960 when N_Indexed_Component
=>
11961 Pref
:= Prefix
(Pref
);
11969 if Present
(Pref
) then
11970 Btyp
:= Base_Type
(Etype
(Pref
));
11973 return Present
(Btyp
)
11974 and then (Is_Record_Type
(Btyp
) or else Is_Array_Type
(Btyp
))
11975 and then Reverse_Storage_Order
(Btyp
);
11976 end In_Reverse_Storage_Order_Object
;
11978 --------------------------------------
11979 -- In_Subprogram_Or_Concurrent_Unit --
11980 --------------------------------------
11982 function In_Subprogram_Or_Concurrent_Unit
return Boolean is
11987 -- Use scope chain to check successively outer scopes
11989 E
:= Current_Scope
;
11993 if K
in Subprogram_Kind
11994 or else K
in Concurrent_Kind
11995 or else K
in Generic_Subprogram_Kind
11999 elsif E
= Standard_Standard
then
12005 end In_Subprogram_Or_Concurrent_Unit
;
12011 function In_Subtree
(N
: Node_Id
; Root
: Node_Id
) return Boolean is
12016 while Present
(Curr
) loop
12017 if Curr
= Root
then
12021 Curr
:= Parent
(Curr
);
12031 function In_Subtree
12034 Root2
: Node_Id
) return Boolean
12040 while Present
(Curr
) loop
12041 if Curr
= Root1
or else Curr
= Root2
then
12045 Curr
:= Parent
(Curr
);
12051 ---------------------
12052 -- In_Visible_Part --
12053 ---------------------
12055 function In_Visible_Part
(Scope_Id
: Entity_Id
) return Boolean is
12057 return Is_Package_Or_Generic_Package
(Scope_Id
)
12058 and then In_Open_Scopes
(Scope_Id
)
12059 and then not In_Package_Body
(Scope_Id
)
12060 and then not In_Private_Part
(Scope_Id
);
12061 end In_Visible_Part
;
12063 --------------------------------
12064 -- Incomplete_Or_Partial_View --
12065 --------------------------------
12067 function Incomplete_Or_Partial_View
(Id
: Entity_Id
) return Entity_Id
is
12068 function Inspect_Decls
12070 Taft
: Boolean := False) return Entity_Id
;
12071 -- Check whether a declarative region contains the incomplete or partial
12074 -------------------
12075 -- Inspect_Decls --
12076 -------------------
12078 function Inspect_Decls
12080 Taft
: Boolean := False) return Entity_Id
12086 Decl
:= First
(Decls
);
12087 while Present
(Decl
) loop
12090 -- The partial view of a Taft-amendment type is an incomplete
12094 if Nkind
(Decl
) = N_Incomplete_Type_Declaration
then
12095 Match
:= Defining_Identifier
(Decl
);
12098 -- Otherwise look for a private type whose full view matches the
12099 -- input type. Note that this checks full_type_declaration nodes
12100 -- to account for derivations from a private type where the type
12101 -- declaration hold the partial view and the full view is an
12104 elsif Nkind_In
(Decl
, N_Full_Type_Declaration
,
12105 N_Private_Extension_Declaration
,
12106 N_Private_Type_Declaration
)
12108 Match
:= Defining_Identifier
(Decl
);
12111 -- Guard against unanalyzed entities
12114 and then Is_Type
(Match
)
12115 and then Present
(Full_View
(Match
))
12116 and then Full_View
(Match
) = Id
12131 -- Start of processing for Incomplete_Or_Partial_View
12134 -- Deferred constant or incomplete type case
12136 Prev
:= Current_Entity_In_Scope
(Id
);
12139 and then (Is_Incomplete_Type
(Prev
) or else Ekind
(Prev
) = E_Constant
)
12140 and then Present
(Full_View
(Prev
))
12141 and then Full_View
(Prev
) = Id
12146 -- Private or Taft amendment type case
12149 Pkg
: constant Entity_Id
:= Scope
(Id
);
12150 Pkg_Decl
: Node_Id
:= Pkg
;
12154 and then Ekind_In
(Pkg
, E_Generic_Package
, E_Package
)
12156 while Nkind
(Pkg_Decl
) /= N_Package_Specification
loop
12157 Pkg_Decl
:= Parent
(Pkg_Decl
);
12160 -- It is knows that Typ has a private view, look for it in the
12161 -- visible declarations of the enclosing scope. A special case
12162 -- of this is when the two views have been exchanged - the full
12163 -- appears earlier than the private.
12165 if Has_Private_Declaration
(Id
) then
12166 Prev
:= Inspect_Decls
(Visible_Declarations
(Pkg_Decl
));
12168 -- Exchanged view case, look in the private declarations
12171 Prev
:= Inspect_Decls
(Private_Declarations
(Pkg_Decl
));
12176 -- Otherwise if this is the package body, then Typ is a potential
12177 -- Taft amendment type. The incomplete view should be located in
12178 -- the private declarations of the enclosing scope.
12180 elsif In_Package_Body
(Pkg
) then
12181 return Inspect_Decls
(Private_Declarations
(Pkg_Decl
), True);
12186 -- The type has no incomplete or private view
12189 end Incomplete_Or_Partial_View
;
12191 ---------------------------------------
12192 -- Incomplete_View_From_Limited_With --
12193 ---------------------------------------
12195 function Incomplete_View_From_Limited_With
12196 (Typ
: Entity_Id
) return Entity_Id
12199 -- It might make sense to make this an attribute in Einfo, and set it
12200 -- in Sem_Ch10 in Build_Shadow_Entity. However, we're running short on
12201 -- slots for new attributes, and it seems a bit simpler to just search
12202 -- the Limited_View (if it exists) for an incomplete type whose
12203 -- Non_Limited_View is Typ.
12205 if Ekind
(Scope
(Typ
)) = E_Package
12206 and then Present
(Limited_View
(Scope
(Typ
)))
12209 Ent
: Entity_Id
:= First_Entity
(Limited_View
(Scope
(Typ
)));
12211 while Present
(Ent
) loop
12212 if Ekind
(Ent
) in Incomplete_Kind
12213 and then Non_Limited_View
(Ent
) = Typ
12218 Ent
:= Next_Entity
(Ent
);
12224 end Incomplete_View_From_Limited_With
;
12226 ----------------------------------
12227 -- Indexed_Component_Bit_Offset --
12228 ----------------------------------
12230 function Indexed_Component_Bit_Offset
(N
: Node_Id
) return Uint
is
12231 Exp
: constant Node_Id
:= First
(Expressions
(N
));
12232 Typ
: constant Entity_Id
:= Etype
(Prefix
(N
));
12233 Off
: constant Uint
:= Component_Size
(Typ
);
12237 -- Return early if the component size is not known or variable
12239 if Off
= No_Uint
or else Off
< Uint_0
then
12243 -- Deal with the degenerate case of an empty component
12245 if Off
= Uint_0
then
12249 -- Check that both the index value and the low bound are known
12251 if not Compile_Time_Known_Value
(Exp
) then
12255 Ind
:= First_Index
(Typ
);
12260 if Nkind
(Ind
) = N_Subtype_Indication
then
12261 Ind
:= Constraint
(Ind
);
12263 if Nkind
(Ind
) = N_Range_Constraint
then
12264 Ind
:= Range_Expression
(Ind
);
12268 if Nkind
(Ind
) /= N_Range
12269 or else not Compile_Time_Known_Value
(Low_Bound
(Ind
))
12274 -- Return the scaled offset
12276 return Off
* (Expr_Value
(Exp
) - Expr_Value
(Low_Bound
((Ind
))));
12277 end Indexed_Component_Bit_Offset
;
12279 ----------------------------
12280 -- Inherit_Rep_Item_Chain --
12281 ----------------------------
12283 procedure Inherit_Rep_Item_Chain
(Typ
: Entity_Id
; From_Typ
: Entity_Id
) is
12285 Next_Item
: Node_Id
;
12288 -- There are several inheritance scenarios to consider depending on
12289 -- whether both types have rep item chains and whether the destination
12290 -- type already inherits part of the source type's rep item chain.
12292 -- 1) The source type lacks a rep item chain
12293 -- From_Typ ---> Empty
12295 -- Typ --------> Item (or Empty)
12297 -- In this case inheritance cannot take place because there are no items
12300 -- 2) The destination type lacks a rep item chain
12301 -- From_Typ ---> Item ---> ...
12303 -- Typ --------> Empty
12305 -- Inheritance takes place by setting the First_Rep_Item of the
12306 -- destination type to the First_Rep_Item of the source type.
12307 -- From_Typ ---> Item ---> ...
12309 -- Typ -----------+
12311 -- 3.1) Both source and destination types have at least one rep item.
12312 -- The destination type does NOT inherit a rep item from the source
12314 -- From_Typ ---> Item ---> Item
12316 -- Typ --------> Item ---> Item
12318 -- Inheritance takes place by setting the Next_Rep_Item of the last item
12319 -- of the destination type to the First_Rep_Item of the source type.
12320 -- From_Typ -------------------> Item ---> Item
12322 -- Typ --------> Item ---> Item --+
12324 -- 3.2) Both source and destination types have at least one rep item.
12325 -- The destination type DOES inherit part of the rep item chain of the
12327 -- From_Typ ---> Item ---> Item ---> Item
12329 -- Typ --------> Item ------+
12331 -- This rare case arises when the full view of a private extension must
12332 -- inherit the rep item chain from the full view of its parent type and
12333 -- the full view of the parent type contains extra rep items. Currently
12334 -- only invariants may lead to such form of inheritance.
12336 -- type From_Typ is tagged private
12337 -- with Type_Invariant'Class => Item_2;
12339 -- type Typ is new From_Typ with private
12340 -- with Type_Invariant => Item_4;
12342 -- At this point the rep item chains contain the following items
12344 -- From_Typ -----------> Item_2 ---> Item_3
12346 -- Typ --------> Item_4 --+
12348 -- The full views of both types may introduce extra invariants
12350 -- type From_Typ is tagged null record
12351 -- with Type_Invariant => Item_1;
12353 -- type Typ is new From_Typ with null record;
12355 -- The full view of Typ would have to inherit any new rep items added to
12356 -- the full view of From_Typ.
12358 -- From_Typ -----------> Item_1 ---> Item_2 ---> Item_3
12360 -- Typ --------> Item_4 --+
12362 -- To achieve this form of inheritance, the destination type must first
12363 -- sever the link between its own rep chain and that of the source type,
12364 -- then inheritance 3.1 takes place.
12366 -- Case 1: The source type lacks a rep item chain
12368 if No
(First_Rep_Item
(From_Typ
)) then
12371 -- Case 2: The destination type lacks a rep item chain
12373 elsif No
(First_Rep_Item
(Typ
)) then
12374 Set_First_Rep_Item
(Typ
, First_Rep_Item
(From_Typ
));
12376 -- Case 3: Both the source and destination types have at least one rep
12377 -- item. Traverse the rep item chain of the destination type to find the
12382 Next_Item
:= First_Rep_Item
(Typ
);
12383 while Present
(Next_Item
) loop
12385 -- Detect a link between the destination type's rep chain and that
12386 -- of the source type. There are two possibilities:
12391 -- From_Typ ---> Item_1 --->
12393 -- Typ -----------+
12400 -- From_Typ ---> Item_1 ---> Item_2 --->
12402 -- Typ --------> Item_3 ------+
12406 if Has_Rep_Item
(From_Typ
, Next_Item
) then
12411 Next_Item
:= Next_Rep_Item
(Next_Item
);
12414 -- Inherit the source type's rep item chain
12416 if Present
(Item
) then
12417 Set_Next_Rep_Item
(Item
, First_Rep_Item
(From_Typ
));
12419 Set_First_Rep_Item
(Typ
, First_Rep_Item
(From_Typ
));
12422 end Inherit_Rep_Item_Chain
;
12424 ---------------------------------
12425 -- Insert_Explicit_Dereference --
12426 ---------------------------------
12428 procedure Insert_Explicit_Dereference
(N
: Node_Id
) is
12429 New_Prefix
: constant Node_Id
:= Relocate_Node
(N
);
12430 Ent
: Entity_Id
:= Empty
;
12437 Save_Interps
(N
, New_Prefix
);
12440 Make_Explicit_Dereference
(Sloc
(Parent
(N
)),
12441 Prefix
=> New_Prefix
));
12443 Set_Etype
(N
, Designated_Type
(Etype
(New_Prefix
)));
12445 if Is_Overloaded
(New_Prefix
) then
12447 -- The dereference is also overloaded, and its interpretations are
12448 -- the designated types of the interpretations of the original node.
12450 Set_Etype
(N
, Any_Type
);
12452 Get_First_Interp
(New_Prefix
, I
, It
);
12453 while Present
(It
.Nam
) loop
12456 if Is_Access_Type
(T
) then
12457 Add_One_Interp
(N
, Designated_Type
(T
), Designated_Type
(T
));
12460 Get_Next_Interp
(I
, It
);
12466 -- Prefix is unambiguous: mark the original prefix (which might
12467 -- Come_From_Source) as a reference, since the new (relocated) one
12468 -- won't be taken into account.
12470 if Is_Entity_Name
(New_Prefix
) then
12471 Ent
:= Entity
(New_Prefix
);
12472 Pref
:= New_Prefix
;
12474 -- For a retrieval of a subcomponent of some composite object,
12475 -- retrieve the ultimate entity if there is one.
12477 elsif Nkind_In
(New_Prefix
, N_Selected_Component
,
12478 N_Indexed_Component
)
12480 Pref
:= Prefix
(New_Prefix
);
12481 while Present
(Pref
)
12482 and then Nkind_In
(Pref
, N_Selected_Component
,
12483 N_Indexed_Component
)
12485 Pref
:= Prefix
(Pref
);
12488 if Present
(Pref
) and then Is_Entity_Name
(Pref
) then
12489 Ent
:= Entity
(Pref
);
12493 -- Place the reference on the entity node
12495 if Present
(Ent
) then
12496 Generate_Reference
(Ent
, Pref
);
12499 end Insert_Explicit_Dereference
;
12501 ------------------------------------------
12502 -- Inspect_Deferred_Constant_Completion --
12503 ------------------------------------------
12505 procedure Inspect_Deferred_Constant_Completion
(Decls
: List_Id
) is
12509 Decl
:= First
(Decls
);
12510 while Present
(Decl
) loop
12512 -- Deferred constant signature
12514 if Nkind
(Decl
) = N_Object_Declaration
12515 and then Constant_Present
(Decl
)
12516 and then No
(Expression
(Decl
))
12518 -- No need to check internally generated constants
12520 and then Comes_From_Source
(Decl
)
12522 -- The constant is not completed. A full object declaration or a
12523 -- pragma Import complete a deferred constant.
12525 and then not Has_Completion
(Defining_Identifier
(Decl
))
12528 ("constant declaration requires initialization expression",
12529 Defining_Identifier
(Decl
));
12532 Decl
:= Next
(Decl
);
12534 end Inspect_Deferred_Constant_Completion
;
12536 -----------------------------
12537 -- Install_Generic_Formals --
12538 -----------------------------
12540 procedure Install_Generic_Formals
(Subp_Id
: Entity_Id
) is
12544 pragma Assert
(Is_Generic_Subprogram
(Subp_Id
));
12546 E
:= First_Entity
(Subp_Id
);
12547 while Present
(E
) loop
12548 Install_Entity
(E
);
12551 end Install_Generic_Formals
;
12553 ------------------------
12554 -- Install_SPARK_Mode --
12555 ------------------------
12557 procedure Install_SPARK_Mode
(Mode
: SPARK_Mode_Type
; Prag
: Node_Id
) is
12559 SPARK_Mode
:= Mode
;
12560 SPARK_Mode_Pragma
:= Prag
;
12561 end Install_SPARK_Mode
;
12563 -----------------------------
12564 -- Is_Actual_Out_Parameter --
12565 -----------------------------
12567 function Is_Actual_Out_Parameter
(N
: Node_Id
) return Boolean is
12568 Formal
: Entity_Id
;
12571 Find_Actual
(N
, Formal
, Call
);
12572 return Present
(Formal
) and then Ekind
(Formal
) = E_Out_Parameter
;
12573 end Is_Actual_Out_Parameter
;
12575 -------------------------
12576 -- Is_Actual_Parameter --
12577 -------------------------
12579 function Is_Actual_Parameter
(N
: Node_Id
) return Boolean is
12580 PK
: constant Node_Kind
:= Nkind
(Parent
(N
));
12584 when N_Parameter_Association
=>
12585 return N
= Explicit_Actual_Parameter
(Parent
(N
));
12587 when N_Subprogram_Call
=>
12588 return Is_List_Member
(N
)
12590 List_Containing
(N
) = Parameter_Associations
(Parent
(N
));
12595 end Is_Actual_Parameter
;
12597 --------------------------------
12598 -- Is_Actual_Tagged_Parameter --
12599 --------------------------------
12601 function Is_Actual_Tagged_Parameter
(N
: Node_Id
) return Boolean is
12602 Formal
: Entity_Id
;
12605 Find_Actual
(N
, Formal
, Call
);
12606 return Present
(Formal
) and then Is_Tagged_Type
(Etype
(Formal
));
12607 end Is_Actual_Tagged_Parameter
;
12609 ---------------------
12610 -- Is_Aliased_View --
12611 ---------------------
12613 function Is_Aliased_View
(Obj
: Node_Id
) return Boolean is
12617 if Is_Entity_Name
(Obj
) then
12624 or else (Present
(Renamed_Object
(E
))
12625 and then Is_Aliased_View
(Renamed_Object
(E
)))))
12627 or else ((Is_Formal
(E
) or else Is_Formal_Object
(E
))
12628 and then Is_Tagged_Type
(Etype
(E
)))
12630 or else (Is_Concurrent_Type
(E
) and then In_Open_Scopes
(E
))
12632 -- Current instance of type, either directly or as rewritten
12633 -- reference to the current object.
12635 or else (Is_Entity_Name
(Original_Node
(Obj
))
12636 and then Present
(Entity
(Original_Node
(Obj
)))
12637 and then Is_Type
(Entity
(Original_Node
(Obj
))))
12639 or else (Is_Type
(E
) and then E
= Current_Scope
)
12641 or else (Is_Incomplete_Or_Private_Type
(E
)
12642 and then Full_View
(E
) = Current_Scope
)
12644 -- Ada 2012 AI05-0053: the return object of an extended return
12645 -- statement is aliased if its type is immutably limited.
12647 or else (Is_Return_Object
(E
)
12648 and then Is_Limited_View
(Etype
(E
)));
12650 elsif Nkind
(Obj
) = N_Selected_Component
then
12651 return Is_Aliased
(Entity
(Selector_Name
(Obj
)));
12653 elsif Nkind
(Obj
) = N_Indexed_Component
then
12654 return Has_Aliased_Components
(Etype
(Prefix
(Obj
)))
12656 (Is_Access_Type
(Etype
(Prefix
(Obj
)))
12657 and then Has_Aliased_Components
12658 (Designated_Type
(Etype
(Prefix
(Obj
)))));
12660 elsif Nkind_In
(Obj
, N_Unchecked_Type_Conversion
, N_Type_Conversion
) then
12661 return Is_Tagged_Type
(Etype
(Obj
))
12662 and then Is_Aliased_View
(Expression
(Obj
));
12664 elsif Nkind
(Obj
) = N_Explicit_Dereference
then
12665 return Nkind
(Original_Node
(Obj
)) /= N_Function_Call
;
12670 end Is_Aliased_View
;
12672 -------------------------
12673 -- Is_Ancestor_Package --
12674 -------------------------
12676 function Is_Ancestor_Package
12678 E2
: Entity_Id
) return Boolean
12684 while Present
(Par
) and then Par
/= Standard_Standard
loop
12689 Par
:= Scope
(Par
);
12693 end Is_Ancestor_Package
;
12695 ----------------------
12696 -- Is_Atomic_Object --
12697 ----------------------
12699 function Is_Atomic_Object
(N
: Node_Id
) return Boolean is
12701 function Object_Has_Atomic_Components
(N
: Node_Id
) return Boolean;
12702 -- Determines if given object has atomic components
12704 function Is_Atomic_Prefix
(N
: Node_Id
) return Boolean;
12705 -- If prefix is an implicit dereference, examine designated type
12707 ----------------------
12708 -- Is_Atomic_Prefix --
12709 ----------------------
12711 function Is_Atomic_Prefix
(N
: Node_Id
) return Boolean is
12713 if Is_Access_Type
(Etype
(N
)) then
12715 Has_Atomic_Components
(Designated_Type
(Etype
(N
)));
12717 return Object_Has_Atomic_Components
(N
);
12719 end Is_Atomic_Prefix
;
12721 ----------------------------------
12722 -- Object_Has_Atomic_Components --
12723 ----------------------------------
12725 function Object_Has_Atomic_Components
(N
: Node_Id
) return Boolean is
12727 if Has_Atomic_Components
(Etype
(N
))
12728 or else Is_Atomic
(Etype
(N
))
12732 elsif Is_Entity_Name
(N
)
12733 and then (Has_Atomic_Components
(Entity
(N
))
12734 or else Is_Atomic
(Entity
(N
)))
12738 elsif Nkind
(N
) = N_Selected_Component
12739 and then Is_Atomic
(Entity
(Selector_Name
(N
)))
12743 elsif Nkind
(N
) = N_Indexed_Component
12744 or else Nkind
(N
) = N_Selected_Component
12746 return Is_Atomic_Prefix
(Prefix
(N
));
12751 end Object_Has_Atomic_Components
;
12753 -- Start of processing for Is_Atomic_Object
12756 -- Predicate is not relevant to subprograms
12758 if Is_Entity_Name
(N
) and then Is_Overloadable
(Entity
(N
)) then
12761 elsif Is_Atomic
(Etype
(N
))
12762 or else (Is_Entity_Name
(N
) and then Is_Atomic
(Entity
(N
)))
12766 elsif Nkind
(N
) = N_Selected_Component
12767 and then Is_Atomic
(Entity
(Selector_Name
(N
)))
12771 elsif Nkind
(N
) = N_Indexed_Component
12772 or else Nkind
(N
) = N_Selected_Component
12774 return Is_Atomic_Prefix
(Prefix
(N
));
12779 end Is_Atomic_Object
;
12781 -----------------------------
12782 -- Is_Atomic_Or_VFA_Object --
12783 -----------------------------
12785 function Is_Atomic_Or_VFA_Object
(N
: Node_Id
) return Boolean is
12787 return Is_Atomic_Object
(N
)
12788 or else (Is_Object_Reference
(N
)
12789 and then Is_Entity_Name
(N
)
12790 and then (Is_Volatile_Full_Access
(Entity
(N
))
12792 Is_Volatile_Full_Access
(Etype
(Entity
(N
)))));
12793 end Is_Atomic_Or_VFA_Object
;
12795 -------------------------
12796 -- Is_Attribute_Result --
12797 -------------------------
12799 function Is_Attribute_Result
(N
: Node_Id
) return Boolean is
12801 return Nkind
(N
) = N_Attribute_Reference
12802 and then Attribute_Name
(N
) = Name_Result
;
12803 end Is_Attribute_Result
;
12805 -------------------------
12806 -- Is_Attribute_Update --
12807 -------------------------
12809 function Is_Attribute_Update
(N
: Node_Id
) return Boolean is
12811 return Nkind
(N
) = N_Attribute_Reference
12812 and then Attribute_Name
(N
) = Name_Update
;
12813 end Is_Attribute_Update
;
12815 ------------------------------------
12816 -- Is_Body_Or_Package_Declaration --
12817 ------------------------------------
12819 function Is_Body_Or_Package_Declaration
(N
: Node_Id
) return Boolean is
12821 return Nkind_In
(N
, N_Entry_Body
,
12823 N_Package_Declaration
,
12827 end Is_Body_Or_Package_Declaration
;
12829 -----------------------
12830 -- Is_Bounded_String --
12831 -----------------------
12833 function Is_Bounded_String
(T
: Entity_Id
) return Boolean is
12834 Under
: constant Entity_Id
:= Underlying_Type
(Root_Type
(T
));
12837 -- Check whether T is ultimately derived from Ada.Strings.Superbounded.
12838 -- Super_String, or one of the [Wide_]Wide_ versions. This will
12839 -- be True for all the Bounded_String types in instances of the
12840 -- Generic_Bounded_Length generics, and for types derived from those.
12842 return Present
(Under
)
12843 and then (Is_RTE
(Root_Type
(Under
), RO_SU_Super_String
) or else
12844 Is_RTE
(Root_Type
(Under
), RO_WI_Super_String
) or else
12845 Is_RTE
(Root_Type
(Under
), RO_WW_Super_String
));
12846 end Is_Bounded_String
;
12848 ---------------------
12849 -- Is_CCT_Instance --
12850 ---------------------
12852 function Is_CCT_Instance
12853 (Ref_Id
: Entity_Id
;
12854 Context_Id
: Entity_Id
) return Boolean
12857 pragma Assert
(Ekind_In
(Ref_Id
, E_Protected_Type
, E_Task_Type
));
12859 if Is_Single_Task_Object
(Context_Id
) then
12860 return Scope_Within_Or_Same
(Etype
(Context_Id
), Ref_Id
);
12863 pragma Assert
(Ekind_In
(Context_Id
, E_Entry
,
12871 Is_Record_Type
(Context_Id
));
12872 return Scope_Within_Or_Same
(Context_Id
, Ref_Id
);
12874 end Is_CCT_Instance
;
12876 -------------------------
12877 -- Is_Child_Or_Sibling --
12878 -------------------------
12880 function Is_Child_Or_Sibling
12881 (Pack_1
: Entity_Id
;
12882 Pack_2
: Entity_Id
) return Boolean
12884 function Distance_From_Standard
(Pack
: Entity_Id
) return Nat
;
12885 -- Given an arbitrary package, return the number of "climbs" necessary
12886 -- to reach scope Standard_Standard.
12888 procedure Equalize_Depths
12889 (Pack
: in out Entity_Id
;
12890 Depth
: in out Nat
;
12891 Depth_To_Reach
: Nat
);
12892 -- Given an arbitrary package, its depth and a target depth to reach,
12893 -- climb the scope chain until the said depth is reached. The pointer
12894 -- to the package and its depth a modified during the climb.
12896 ----------------------------
12897 -- Distance_From_Standard --
12898 ----------------------------
12900 function Distance_From_Standard
(Pack
: Entity_Id
) return Nat
is
12907 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
12909 Scop
:= Scope
(Scop
);
12913 end Distance_From_Standard
;
12915 ---------------------
12916 -- Equalize_Depths --
12917 ---------------------
12919 procedure Equalize_Depths
12920 (Pack
: in out Entity_Id
;
12921 Depth
: in out Nat
;
12922 Depth_To_Reach
: Nat
)
12925 -- The package must be at a greater or equal depth
12927 if Depth
< Depth_To_Reach
then
12928 raise Program_Error
;
12931 -- Climb the scope chain until the desired depth is reached
12933 while Present
(Pack
) and then Depth
/= Depth_To_Reach
loop
12934 Pack
:= Scope
(Pack
);
12935 Depth
:= Depth
- 1;
12937 end Equalize_Depths
;
12941 P_1
: Entity_Id
:= Pack_1
;
12942 P_1_Child
: Boolean := False;
12943 P_1_Depth
: Nat
:= Distance_From_Standard
(P_1
);
12944 P_2
: Entity_Id
:= Pack_2
;
12945 P_2_Child
: Boolean := False;
12946 P_2_Depth
: Nat
:= Distance_From_Standard
(P_2
);
12948 -- Start of processing for Is_Child_Or_Sibling
12952 (Ekind
(Pack_1
) = E_Package
and then Ekind
(Pack_2
) = E_Package
);
12954 -- Both packages denote the same entity, therefore they cannot be
12955 -- children or siblings.
12960 -- One of the packages is at a deeper level than the other. Note that
12961 -- both may still come from different hierarchies.
12969 elsif P_1_Depth
> P_2_Depth
then
12972 Depth
=> P_1_Depth
,
12973 Depth_To_Reach
=> P_2_Depth
);
12982 elsif P_2_Depth
> P_1_Depth
then
12985 Depth
=> P_2_Depth
,
12986 Depth_To_Reach
=> P_1_Depth
);
12990 -- At this stage the package pointers have been elevated to the same
12991 -- depth. If the related entities are the same, then one package is a
12992 -- potential child of the other:
12996 -- X became P_1 P_2 or vice versa
13002 return Is_Child_Unit
(Pack_1
);
13004 else pragma Assert
(P_2_Child
);
13005 return Is_Child_Unit
(Pack_2
);
13008 -- The packages may come from the same package chain or from entirely
13009 -- different hierarcies. To determine this, climb the scope stack until
13010 -- a common root is found.
13012 -- (root) (root 1) (root 2)
13017 while Present
(P_1
) and then Present
(P_2
) loop
13019 -- The two packages may be siblings
13022 return Is_Child_Unit
(Pack_1
) and then Is_Child_Unit
(Pack_2
);
13025 P_1
:= Scope
(P_1
);
13026 P_2
:= Scope
(P_2
);
13031 end Is_Child_Or_Sibling
;
13033 -----------------------------
13034 -- Is_Concurrent_Interface --
13035 -----------------------------
13037 function Is_Concurrent_Interface
(T
: Entity_Id
) return Boolean is
13039 return Is_Interface
(T
)
13041 (Is_Protected_Interface
(T
)
13042 or else Is_Synchronized_Interface
(T
)
13043 or else Is_Task_Interface
(T
));
13044 end Is_Concurrent_Interface
;
13046 -----------------------
13047 -- Is_Constant_Bound --
13048 -----------------------
13050 function Is_Constant_Bound
(Exp
: Node_Id
) return Boolean is
13052 if Compile_Time_Known_Value
(Exp
) then
13055 elsif Is_Entity_Name
(Exp
) and then Present
(Entity
(Exp
)) then
13056 return Is_Constant_Object
(Entity
(Exp
))
13057 or else Ekind
(Entity
(Exp
)) = E_Enumeration_Literal
;
13059 elsif Nkind
(Exp
) in N_Binary_Op
then
13060 return Is_Constant_Bound
(Left_Opnd
(Exp
))
13061 and then Is_Constant_Bound
(Right_Opnd
(Exp
))
13062 and then Scope
(Entity
(Exp
)) = Standard_Standard
;
13067 end Is_Constant_Bound
;
13069 ---------------------------
13070 -- Is_Container_Element --
13071 ---------------------------
13073 function Is_Container_Element
(Exp
: Node_Id
) return Boolean is
13074 Loc
: constant Source_Ptr
:= Sloc
(Exp
);
13075 Pref
: constant Node_Id
:= Prefix
(Exp
);
13078 -- Call to an indexing aspect
13080 Cont_Typ
: Entity_Id
;
13081 -- The type of the container being accessed
13083 Elem_Typ
: Entity_Id
;
13084 -- Its element type
13086 Indexing
: Entity_Id
;
13087 Is_Const
: Boolean;
13088 -- Indicates that constant indexing is used, and the element is thus
13091 Ref_Typ
: Entity_Id
;
13092 -- The reference type returned by the indexing operation
13095 -- If C is a container, in a context that imposes the element type of
13096 -- that container, the indexing notation C (X) is rewritten as:
13098 -- Indexing (C, X).Discr.all
13100 -- where Indexing is one of the indexing aspects of the container.
13101 -- If the context does not require a reference, the construct can be
13106 -- First, verify that the construct has the proper form
13108 if not Expander_Active
then
13111 elsif Nkind
(Pref
) /= N_Selected_Component
then
13114 elsif Nkind
(Prefix
(Pref
)) /= N_Function_Call
then
13118 Call
:= Prefix
(Pref
);
13119 Ref_Typ
:= Etype
(Call
);
13122 if not Has_Implicit_Dereference
(Ref_Typ
)
13123 or else No
(First
(Parameter_Associations
(Call
)))
13124 or else not Is_Entity_Name
(Name
(Call
))
13129 -- Retrieve type of container object, and its iterator aspects
13131 Cont_Typ
:= Etype
(First
(Parameter_Associations
(Call
)));
13132 Indexing
:= Find_Value_Of_Aspect
(Cont_Typ
, Aspect_Constant_Indexing
);
13135 if No
(Indexing
) then
13137 -- Container should have at least one indexing operation
13141 elsif Entity
(Name
(Call
)) /= Entity
(Indexing
) then
13143 -- This may be a variable indexing operation
13145 Indexing
:= Find_Value_Of_Aspect
(Cont_Typ
, Aspect_Variable_Indexing
);
13148 or else Entity
(Name
(Call
)) /= Entity
(Indexing
)
13157 Elem_Typ
:= Find_Value_Of_Aspect
(Cont_Typ
, Aspect_Iterator_Element
);
13159 if No
(Elem_Typ
) or else Entity
(Elem_Typ
) /= Etype
(Exp
) then
13163 -- Check that the expression is not the target of an assignment, in
13164 -- which case the rewriting is not possible.
13166 if not Is_Const
then
13172 while Present
(Par
)
13174 if Nkind
(Parent
(Par
)) = N_Assignment_Statement
13175 and then Par
= Name
(Parent
(Par
))
13179 -- A renaming produces a reference, and the transformation
13182 elsif Nkind
(Parent
(Par
)) = N_Object_Renaming_Declaration
then
13186 (Nkind
(Parent
(Par
)), N_Function_Call
,
13187 N_Procedure_Call_Statement
,
13188 N_Entry_Call_Statement
)
13190 -- Check that the element is not part of an actual for an
13191 -- in-out parameter.
13198 F
:= First_Formal
(Entity
(Name
(Parent
(Par
))));
13199 A
:= First
(Parameter_Associations
(Parent
(Par
)));
13200 while Present
(F
) loop
13201 if A
= Par
and then Ekind
(F
) /= E_In_Parameter
then
13210 -- E_In_Parameter in a call: element is not modified.
13215 Par
:= Parent
(Par
);
13220 -- The expression has the proper form and the context requires the
13221 -- element type. Retrieve the Element function of the container and
13222 -- rewrite the construct as a call to it.
13228 Op
:= First_Elmt
(Primitive_Operations
(Cont_Typ
));
13229 while Present
(Op
) loop
13230 exit when Chars
(Node
(Op
)) = Name_Element
;
13239 Make_Function_Call
(Loc
,
13240 Name
=> New_Occurrence_Of
(Node
(Op
), Loc
),
13241 Parameter_Associations
=> Parameter_Associations
(Call
)));
13242 Analyze_And_Resolve
(Exp
, Entity
(Elem_Typ
));
13246 end Is_Container_Element
;
13248 ----------------------------
13249 -- Is_Contract_Annotation --
13250 ----------------------------
13252 function Is_Contract_Annotation
(Item
: Node_Id
) return Boolean is
13254 return Is_Package_Contract_Annotation
(Item
)
13256 Is_Subprogram_Contract_Annotation
(Item
);
13257 end Is_Contract_Annotation
;
13259 --------------------------------------
13260 -- Is_Controlling_Limited_Procedure --
13261 --------------------------------------
13263 function Is_Controlling_Limited_Procedure
13264 (Proc_Nam
: Entity_Id
) return Boolean
13267 Param_Typ
: Entity_Id
:= Empty
;
13270 if Ekind
(Proc_Nam
) = E_Procedure
13271 and then Present
(Parameter_Specifications
(Parent
(Proc_Nam
)))
13275 (First
(Parameter_Specifications
(Parent
(Proc_Nam
))));
13277 -- The formal may be an anonymous access type
13279 if Nkind
(Param
) = N_Access_Definition
then
13280 Param_Typ
:= Entity
(Subtype_Mark
(Param
));
13282 Param_Typ
:= Etype
(Param
);
13285 -- In the case where an Itype was created for a dispatchin call, the
13286 -- procedure call has been rewritten. The actual may be an access to
13287 -- interface type in which case it is the designated type that is the
13288 -- controlling type.
13290 elsif Present
(Associated_Node_For_Itype
(Proc_Nam
))
13291 and then Present
(Original_Node
(Associated_Node_For_Itype
(Proc_Nam
)))
13293 Present
(Parameter_Associations
13294 (Associated_Node_For_Itype
(Proc_Nam
)))
13297 Etype
(First
(Parameter_Associations
13298 (Associated_Node_For_Itype
(Proc_Nam
))));
13300 if Ekind
(Param_Typ
) = E_Anonymous_Access_Type
then
13301 Param_Typ
:= Directly_Designated_Type
(Param_Typ
);
13305 if Present
(Param_Typ
) then
13307 Is_Interface
(Param_Typ
)
13308 and then Is_Limited_Record
(Param_Typ
);
13312 end Is_Controlling_Limited_Procedure
;
13314 -----------------------------
13315 -- Is_CPP_Constructor_Call --
13316 -----------------------------
13318 function Is_CPP_Constructor_Call
(N
: Node_Id
) return Boolean is
13320 return Nkind
(N
) = N_Function_Call
13321 and then Is_CPP_Class
(Etype
(Etype
(N
)))
13322 and then Is_Constructor
(Entity
(Name
(N
)))
13323 and then Is_Imported
(Entity
(Name
(N
)));
13324 end Is_CPP_Constructor_Call
;
13326 -------------------------
13327 -- Is_Current_Instance --
13328 -------------------------
13330 function Is_Current_Instance
(N
: Node_Id
) return Boolean is
13331 Typ
: constant Entity_Id
:= Entity
(N
);
13335 -- Simplest case: entity is a concurrent type and we are currently
13336 -- inside the body. This will eventually be expanded into a
13337 -- call to Self (for tasks) or _object (for protected objects).
13339 if Is_Concurrent_Type
(Typ
) and then In_Open_Scopes
(Typ
) then
13343 -- Check whether the context is a (sub)type declaration for the
13347 while Present
(P
) loop
13348 if Nkind_In
(P
, N_Full_Type_Declaration
,
13349 N_Private_Type_Declaration
,
13350 N_Subtype_Declaration
)
13351 and then Comes_From_Source
(P
)
13352 and then Defining_Entity
(P
) = Typ
13356 -- A subtype name may appear in an aspect specification for a
13357 -- Predicate_Failure aspect, for which we do not construct a
13358 -- wrapper procedure. The subtype will be replaced by the
13359 -- expression being tested when the corresponding predicate
13360 -- check is expanded.
13362 elsif Nkind
(P
) = N_Aspect_Specification
13363 and then Nkind
(Parent
(P
)) = N_Subtype_Declaration
13367 elsif Nkind
(P
) = N_Pragma
13369 Get_Pragma_Id
(P
) = Pragma_Predicate_Failure
13378 -- In any other context this is not a current occurrence
13381 end Is_Current_Instance
;
13383 --------------------
13384 -- Is_Declaration --
13385 --------------------
13387 function Is_Declaration
(N
: Node_Id
) return Boolean is
13390 Is_Declaration_Other_Than_Renaming
(N
)
13391 or else Is_Renaming_Declaration
(N
);
13392 end Is_Declaration
;
13394 ----------------------------------------
13395 -- Is_Declaration_Other_Than_Renaming --
13396 ----------------------------------------
13398 function Is_Declaration_Other_Than_Renaming
(N
: Node_Id
) return Boolean is
13401 when N_Abstract_Subprogram_Declaration
13402 | N_Exception_Declaration
13403 | N_Expression_Function
13404 | N_Full_Type_Declaration
13405 | N_Generic_Package_Declaration
13406 | N_Generic_Subprogram_Declaration
13407 | N_Number_Declaration
13408 | N_Object_Declaration
13409 | N_Package_Declaration
13410 | N_Private_Extension_Declaration
13411 | N_Private_Type_Declaration
13412 | N_Subprogram_Declaration
13413 | N_Subtype_Declaration
13420 end Is_Declaration_Other_Than_Renaming
;
13422 --------------------------------
13423 -- Is_Declared_Within_Variant --
13424 --------------------------------
13426 function Is_Declared_Within_Variant
(Comp
: Entity_Id
) return Boolean is
13427 Comp_Decl
: constant Node_Id
:= Parent
(Comp
);
13428 Comp_List
: constant Node_Id
:= Parent
(Comp_Decl
);
13430 return Nkind
(Parent
(Comp_List
)) = N_Variant
;
13431 end Is_Declared_Within_Variant
;
13433 ----------------------------------------------
13434 -- Is_Dependent_Component_Of_Mutable_Object --
13435 ----------------------------------------------
13437 function Is_Dependent_Component_Of_Mutable_Object
13438 (Object
: Node_Id
) return Boolean
13441 Prefix_Type
: Entity_Id
;
13442 P_Aliased
: Boolean := False;
13445 Deref
: Node_Id
:= Object
;
13446 -- Dereference node, in something like X.all.Y(2)
13448 -- Start of processing for Is_Dependent_Component_Of_Mutable_Object
13451 -- Find the dereference node if any
13453 while Nkind_In
(Deref
, N_Indexed_Component
,
13454 N_Selected_Component
,
13457 Deref
:= Prefix
(Deref
);
13460 -- Ada 2005: If we have a component or slice of a dereference,
13461 -- something like X.all.Y (2), and the type of X is access-to-constant,
13462 -- Is_Variable will return False, because it is indeed a constant
13463 -- view. But it might be a view of a variable object, so we want the
13464 -- following condition to be True in that case.
13466 if Is_Variable
(Object
)
13467 or else (Ada_Version
>= Ada_2005
13468 and then Nkind
(Deref
) = N_Explicit_Dereference
)
13470 if Nkind
(Object
) = N_Selected_Component
then
13471 P
:= Prefix
(Object
);
13472 Prefix_Type
:= Etype
(P
);
13474 if Is_Entity_Name
(P
) then
13475 if Ekind
(Entity
(P
)) = E_Generic_In_Out_Parameter
then
13476 Prefix_Type
:= Base_Type
(Prefix_Type
);
13479 if Is_Aliased
(Entity
(P
)) then
13483 -- A discriminant check on a selected component may be expanded
13484 -- into a dereference when removing side effects. Recover the
13485 -- original node and its type, which may be unconstrained.
13487 elsif Nkind
(P
) = N_Explicit_Dereference
13488 and then not (Comes_From_Source
(P
))
13490 P
:= Original_Node
(P
);
13491 Prefix_Type
:= Etype
(P
);
13494 -- Check for prefix being an aliased component???
13500 -- A heap object is constrained by its initial value
13502 -- Ada 2005 (AI-363): Always assume the object could be mutable in
13503 -- the dereferenced case, since the access value might denote an
13504 -- unconstrained aliased object, whereas in Ada 95 the designated
13505 -- object is guaranteed to be constrained. A worst-case assumption
13506 -- has to apply in Ada 2005 because we can't tell at compile
13507 -- time whether the object is "constrained by its initial value",
13508 -- despite the fact that 3.10.2(26/2) and 8.5.1(5/2) are semantic
13509 -- rules (these rules are acknowledged to need fixing). We don't
13510 -- impose this more stringent checking for earlier Ada versions or
13511 -- when Relaxed_RM_Semantics applies (the latter for CodePeer's
13512 -- benefit, though it's unclear on why using -gnat95 would not be
13515 if Ada_Version
< Ada_2005
or else Relaxed_RM_Semantics
then
13516 if Is_Access_Type
(Prefix_Type
)
13517 or else Nkind
(P
) = N_Explicit_Dereference
13522 else pragma Assert
(Ada_Version
>= Ada_2005
);
13523 if Is_Access_Type
(Prefix_Type
) then
13525 -- If the access type is pool-specific, and there is no
13526 -- constrained partial view of the designated type, then the
13527 -- designated object is known to be constrained.
13529 if Ekind
(Prefix_Type
) = E_Access_Type
13530 and then not Object_Type_Has_Constrained_Partial_View
13531 (Typ
=> Designated_Type
(Prefix_Type
),
13532 Scop
=> Current_Scope
)
13536 -- Otherwise (general access type, or there is a constrained
13537 -- partial view of the designated type), we need to check
13538 -- based on the designated type.
13541 Prefix_Type
:= Designated_Type
(Prefix_Type
);
13547 Original_Record_Component
(Entity
(Selector_Name
(Object
)));
13549 -- As per AI-0017, the renaming is illegal in a generic body, even
13550 -- if the subtype is indefinite.
13552 -- Ada 2005 (AI-363): In Ada 2005 an aliased object can be mutable
13554 if not Is_Constrained
(Prefix_Type
)
13555 and then (Is_Definite_Subtype
(Prefix_Type
)
13557 (Is_Generic_Type
(Prefix_Type
)
13558 and then Ekind
(Current_Scope
) = E_Generic_Package
13559 and then In_Package_Body
(Current_Scope
)))
13561 and then (Is_Declared_Within_Variant
(Comp
)
13562 or else Has_Discriminant_Dependent_Constraint
(Comp
))
13563 and then (not P_Aliased
or else Ada_Version
>= Ada_2005
)
13567 -- If the prefix is of an access type at this point, then we want
13568 -- to return False, rather than calling this function recursively
13569 -- on the access object (which itself might be a discriminant-
13570 -- dependent component of some other object, but that isn't
13571 -- relevant to checking the object passed to us). This avoids
13572 -- issuing wrong errors when compiling with -gnatc, where there
13573 -- can be implicit dereferences that have not been expanded.
13575 elsif Is_Access_Type
(Etype
(Prefix
(Object
))) then
13580 Is_Dependent_Component_Of_Mutable_Object
(Prefix
(Object
));
13583 elsif Nkind
(Object
) = N_Indexed_Component
13584 or else Nkind
(Object
) = N_Slice
13586 return Is_Dependent_Component_Of_Mutable_Object
(Prefix
(Object
));
13588 -- A type conversion that Is_Variable is a view conversion:
13589 -- go back to the denoted object.
13591 elsif Nkind
(Object
) = N_Type_Conversion
then
13593 Is_Dependent_Component_Of_Mutable_Object
(Expression
(Object
));
13598 end Is_Dependent_Component_Of_Mutable_Object
;
13600 ---------------------
13601 -- Is_Dereferenced --
13602 ---------------------
13604 function Is_Dereferenced
(N
: Node_Id
) return Boolean is
13605 P
: constant Node_Id
:= Parent
(N
);
13607 return Nkind_In
(P
, N_Selected_Component
,
13608 N_Explicit_Dereference
,
13609 N_Indexed_Component
,
13611 and then Prefix
(P
) = N
;
13612 end Is_Dereferenced
;
13614 ----------------------
13615 -- Is_Descendant_Of --
13616 ----------------------
13618 function Is_Descendant_Of
(T1
: Entity_Id
; T2
: Entity_Id
) return Boolean is
13623 pragma Assert
(Nkind
(T1
) in N_Entity
);
13624 pragma Assert
(Nkind
(T2
) in N_Entity
);
13626 T
:= Base_Type
(T1
);
13628 -- Immediate return if the types match
13633 -- Comment needed here ???
13635 elsif Ekind
(T
) = E_Class_Wide_Type
then
13636 return Etype
(T
) = T2
;
13644 -- Done if we found the type we are looking for
13649 -- Done if no more derivations to check
13656 -- Following test catches error cases resulting from prev errors
13658 elsif No
(Etyp
) then
13661 elsif Is_Private_Type
(T
) and then Etyp
= Full_View
(T
) then
13664 elsif Is_Private_Type
(Etyp
) and then Full_View
(Etyp
) = T
then
13668 T
:= Base_Type
(Etyp
);
13671 end Is_Descendant_Of
;
13673 ----------------------------------------
13674 -- Is_Descendant_Of_Suspension_Object --
13675 ----------------------------------------
13677 function Is_Descendant_Of_Suspension_Object
13678 (Typ
: Entity_Id
) return Boolean
13680 Cur_Typ
: Entity_Id
;
13681 Par_Typ
: Entity_Id
;
13684 -- Climb the type derivation chain checking each parent type against
13685 -- Suspension_Object.
13687 Cur_Typ
:= Base_Type
(Typ
);
13688 while Present
(Cur_Typ
) loop
13689 Par_Typ
:= Etype
(Cur_Typ
);
13691 -- The current type is a match
13693 if Is_Suspension_Object
(Cur_Typ
) then
13696 -- Stop the traversal once the root of the derivation chain has been
13697 -- reached. In that case the current type is its own base type.
13699 elsif Cur_Typ
= Par_Typ
then
13703 Cur_Typ
:= Base_Type
(Par_Typ
);
13707 end Is_Descendant_Of_Suspension_Object
;
13709 ---------------------------------------------
13710 -- Is_Double_Precision_Floating_Point_Type --
13711 ---------------------------------------------
13713 function Is_Double_Precision_Floating_Point_Type
13714 (E
: Entity_Id
) return Boolean is
13716 return Is_Floating_Point_Type
(E
)
13717 and then Machine_Radix_Value
(E
) = Uint_2
13718 and then Machine_Mantissa_Value
(E
) = UI_From_Int
(53)
13719 and then Machine_Emax_Value
(E
) = Uint_2
** Uint_10
13720 and then Machine_Emin_Value
(E
) = Uint_3
- (Uint_2
** Uint_10
);
13721 end Is_Double_Precision_Floating_Point_Type
;
13723 -----------------------------
13724 -- Is_Effectively_Volatile --
13725 -----------------------------
13727 function Is_Effectively_Volatile
(Id
: Entity_Id
) return Boolean is
13729 if Is_Type
(Id
) then
13731 -- An arbitrary type is effectively volatile when it is subject to
13732 -- pragma Atomic or Volatile.
13734 if Is_Volatile
(Id
) then
13737 -- An array type is effectively volatile when it is subject to pragma
13738 -- Atomic_Components or Volatile_Components or its component type is
13739 -- effectively volatile.
13741 elsif Is_Array_Type
(Id
) then
13743 Anc
: Entity_Id
:= Base_Type
(Id
);
13745 if Is_Private_Type
(Anc
) then
13746 Anc
:= Full_View
(Anc
);
13749 -- Test for presence of ancestor, as the full view of a private
13750 -- type may be missing in case of error.
13753 Has_Volatile_Components
(Id
)
13756 and then Is_Effectively_Volatile
(Component_Type
(Anc
)));
13759 -- A protected type is always volatile
13761 elsif Is_Protected_Type
(Id
) then
13764 -- A descendant of Ada.Synchronous_Task_Control.Suspension_Object is
13765 -- automatically volatile.
13767 elsif Is_Descendant_Of_Suspension_Object
(Id
) then
13770 -- Otherwise the type is not effectively volatile
13776 -- Otherwise Id denotes an object
13781 or else Has_Volatile_Components
(Id
)
13782 or else Is_Effectively_Volatile
(Etype
(Id
));
13784 end Is_Effectively_Volatile
;
13786 ------------------------------------
13787 -- Is_Effectively_Volatile_Object --
13788 ------------------------------------
13790 function Is_Effectively_Volatile_Object
(N
: Node_Id
) return Boolean is
13792 if Is_Entity_Name
(N
) then
13793 return Is_Effectively_Volatile
(Entity
(N
));
13795 elsif Nkind
(N
) = N_Indexed_Component
then
13796 return Is_Effectively_Volatile_Object
(Prefix
(N
));
13798 elsif Nkind
(N
) = N_Selected_Component
then
13800 Is_Effectively_Volatile_Object
(Prefix
(N
))
13802 Is_Effectively_Volatile_Object
(Selector_Name
(N
));
13807 end Is_Effectively_Volatile_Object
;
13809 -------------------
13810 -- Is_Entry_Body --
13811 -------------------
13813 function Is_Entry_Body
(Id
: Entity_Id
) return Boolean is
13816 Ekind_In
(Id
, E_Entry
, E_Entry_Family
)
13817 and then Nkind
(Unit_Declaration_Node
(Id
)) = N_Entry_Body
;
13820 --------------------------
13821 -- Is_Entry_Declaration --
13822 --------------------------
13824 function Is_Entry_Declaration
(Id
: Entity_Id
) return Boolean is
13827 Ekind_In
(Id
, E_Entry
, E_Entry_Family
)
13828 and then Nkind
(Unit_Declaration_Node
(Id
)) = N_Entry_Declaration
;
13829 end Is_Entry_Declaration
;
13831 ------------------------------------
13832 -- Is_Expanded_Priority_Attribute --
13833 ------------------------------------
13835 function Is_Expanded_Priority_Attribute
(E
: Entity_Id
) return Boolean is
13838 Nkind
(E
) = N_Function_Call
13839 and then not Configurable_Run_Time_Mode
13840 and then (Entity
(Name
(E
)) = RTE
(RE_Get_Ceiling
)
13841 or else Entity
(Name
(E
)) = RTE
(RO_PE_Get_Ceiling
));
13842 end Is_Expanded_Priority_Attribute
;
13844 ----------------------------
13845 -- Is_Expression_Function --
13846 ----------------------------
13848 function Is_Expression_Function
(Subp
: Entity_Id
) return Boolean is
13850 if Ekind_In
(Subp
, E_Function
, E_Subprogram_Body
) then
13852 Nkind
(Original_Node
(Unit_Declaration_Node
(Subp
))) =
13853 N_Expression_Function
;
13857 end Is_Expression_Function
;
13859 ------------------------------------------
13860 -- Is_Expression_Function_Or_Completion --
13861 ------------------------------------------
13863 function Is_Expression_Function_Or_Completion
13864 (Subp
: Entity_Id
) return Boolean
13866 Subp_Decl
: Node_Id
;
13869 if Ekind
(Subp
) = E_Function
then
13870 Subp_Decl
:= Unit_Declaration_Node
(Subp
);
13872 -- The function declaration is either an expression function or is
13873 -- completed by an expression function body.
13876 Is_Expression_Function
(Subp
)
13877 or else (Nkind
(Subp_Decl
) = N_Subprogram_Declaration
13878 and then Present
(Corresponding_Body
(Subp_Decl
))
13879 and then Is_Expression_Function
13880 (Corresponding_Body
(Subp_Decl
)));
13882 elsif Ekind
(Subp
) = E_Subprogram_Body
then
13883 return Is_Expression_Function
(Subp
);
13888 end Is_Expression_Function_Or_Completion
;
13890 -----------------------
13891 -- Is_EVF_Expression --
13892 -----------------------
13894 function Is_EVF_Expression
(N
: Node_Id
) return Boolean is
13895 Orig_N
: constant Node_Id
:= Original_Node
(N
);
13901 -- Detect a reference to a formal parameter of a specific tagged type
13902 -- whose related subprogram is subject to pragma Expresions_Visible with
13905 if Is_Entity_Name
(N
) and then Present
(Entity
(N
)) then
13910 and then Is_Specific_Tagged_Type
(Etype
(Id
))
13911 and then Extensions_Visible_Status
(Id
) =
13912 Extensions_Visible_False
;
13914 -- A case expression is an EVF expression when it contains at least one
13915 -- EVF dependent_expression. Note that a case expression may have been
13916 -- expanded, hence the use of Original_Node.
13918 elsif Nkind
(Orig_N
) = N_Case_Expression
then
13919 Alt
:= First
(Alternatives
(Orig_N
));
13920 while Present
(Alt
) loop
13921 if Is_EVF_Expression
(Expression
(Alt
)) then
13928 -- An if expression is an EVF expression when it contains at least one
13929 -- EVF dependent_expression. Note that an if expression may have been
13930 -- expanded, hence the use of Original_Node.
13932 elsif Nkind
(Orig_N
) = N_If_Expression
then
13933 Expr
:= Next
(First
(Expressions
(Orig_N
)));
13934 while Present
(Expr
) loop
13935 if Is_EVF_Expression
(Expr
) then
13942 -- A qualified expression or a type conversion is an EVF expression when
13943 -- its operand is an EVF expression.
13945 elsif Nkind_In
(N
, N_Qualified_Expression
,
13946 N_Unchecked_Type_Conversion
,
13949 return Is_EVF_Expression
(Expression
(N
));
13951 -- Attributes 'Loop_Entry, 'Old, and 'Update are EVF expressions when
13952 -- their prefix denotes an EVF expression.
13954 elsif Nkind
(N
) = N_Attribute_Reference
13955 and then Nam_In
(Attribute_Name
(N
), Name_Loop_Entry
,
13959 return Is_EVF_Expression
(Prefix
(N
));
13963 end Is_EVF_Expression
;
13969 function Is_False
(U
: Uint
) return Boolean is
13974 ---------------------------
13975 -- Is_Fixed_Model_Number --
13976 ---------------------------
13978 function Is_Fixed_Model_Number
(U
: Ureal
; T
: Entity_Id
) return Boolean is
13979 S
: constant Ureal
:= Small_Value
(T
);
13980 M
: Urealp
.Save_Mark
;
13985 R
:= (U
= UR_Trunc
(U
/ S
) * S
);
13986 Urealp
.Release
(M
);
13988 end Is_Fixed_Model_Number
;
13990 -------------------------------
13991 -- Is_Fully_Initialized_Type --
13992 -------------------------------
13994 function Is_Fully_Initialized_Type
(Typ
: Entity_Id
) return Boolean is
13998 if Is_Scalar_Type
(Typ
) then
14000 -- A scalar type with an aspect Default_Value is fully initialized
14002 -- Note: Iniitalize/Normalize_Scalars also ensure full initialization
14003 -- of a scalar type, but we don't take that into account here, since
14004 -- we don't want these to affect warnings.
14006 return Has_Default_Aspect
(Typ
);
14008 elsif Is_Access_Type
(Typ
) then
14011 elsif Is_Array_Type
(Typ
) then
14012 if Is_Fully_Initialized_Type
(Component_Type
(Typ
))
14013 or else (Ada_Version
>= Ada_2012
and then Has_Default_Aspect
(Typ
))
14018 -- An interesting case, if we have a constrained type one of whose
14019 -- bounds is known to be null, then there are no elements to be
14020 -- initialized, so all the elements are initialized.
14022 if Is_Constrained
(Typ
) then
14025 Indx_Typ
: Entity_Id
;
14026 Lbd
, Hbd
: Node_Id
;
14029 Indx
:= First_Index
(Typ
);
14030 while Present
(Indx
) loop
14031 if Etype
(Indx
) = Any_Type
then
14034 -- If index is a range, use directly
14036 elsif Nkind
(Indx
) = N_Range
then
14037 Lbd
:= Low_Bound
(Indx
);
14038 Hbd
:= High_Bound
(Indx
);
14041 Indx_Typ
:= Etype
(Indx
);
14043 if Is_Private_Type
(Indx_Typ
) then
14044 Indx_Typ
:= Full_View
(Indx_Typ
);
14047 if No
(Indx_Typ
) or else Etype
(Indx_Typ
) = Any_Type
then
14050 Lbd
:= Type_Low_Bound
(Indx_Typ
);
14051 Hbd
:= Type_High_Bound
(Indx_Typ
);
14055 if Compile_Time_Known_Value
(Lbd
)
14057 Compile_Time_Known_Value
(Hbd
)
14059 if Expr_Value
(Hbd
) < Expr_Value
(Lbd
) then
14069 -- If no null indexes, then type is not fully initialized
14075 elsif Is_Record_Type
(Typ
) then
14076 if Has_Discriminants
(Typ
)
14078 Present
(Discriminant_Default_Value
(First_Discriminant
(Typ
)))
14079 and then Is_Fully_Initialized_Variant
(Typ
)
14084 -- We consider bounded string types to be fully initialized, because
14085 -- otherwise we get false alarms when the Data component is not
14086 -- default-initialized.
14088 if Is_Bounded_String
(Typ
) then
14092 -- Controlled records are considered to be fully initialized if
14093 -- there is a user defined Initialize routine. This may not be
14094 -- entirely correct, but as the spec notes, we are guessing here
14095 -- what is best from the point of view of issuing warnings.
14097 if Is_Controlled
(Typ
) then
14099 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
14102 if Present
(Utyp
) then
14104 Init
: constant Entity_Id
:=
14105 (Find_Optional_Prim_Op
14106 (Underlying_Type
(Typ
), Name_Initialize
));
14110 and then Comes_From_Source
(Init
)
14111 and then not In_Predefined_Unit
(Init
)
14115 elsif Has_Null_Extension
(Typ
)
14117 Is_Fully_Initialized_Type
14118 (Etype
(Base_Type
(Typ
)))
14127 -- Otherwise see if all record components are initialized
14133 Ent
:= First_Entity
(Typ
);
14134 while Present
(Ent
) loop
14135 if Ekind
(Ent
) = E_Component
14136 and then (No
(Parent
(Ent
))
14137 or else No
(Expression
(Parent
(Ent
))))
14138 and then not Is_Fully_Initialized_Type
(Etype
(Ent
))
14140 -- Special VM case for tag components, which need to be
14141 -- defined in this case, but are never initialized as VMs
14142 -- are using other dispatching mechanisms. Ignore this
14143 -- uninitialized case. Note that this applies both to the
14144 -- uTag entry and the main vtable pointer (CPP_Class case).
14146 and then (Tagged_Type_Expansion
or else not Is_Tag
(Ent
))
14155 -- No uninitialized components, so type is fully initialized.
14156 -- Note that this catches the case of no components as well.
14160 elsif Is_Concurrent_Type
(Typ
) then
14163 elsif Is_Private_Type
(Typ
) then
14165 U
: constant Entity_Id
:= Underlying_Type
(Typ
);
14171 return Is_Fully_Initialized_Type
(U
);
14178 end Is_Fully_Initialized_Type
;
14180 ----------------------------------
14181 -- Is_Fully_Initialized_Variant --
14182 ----------------------------------
14184 function Is_Fully_Initialized_Variant
(Typ
: Entity_Id
) return Boolean is
14185 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
14186 Constraints
: constant List_Id
:= New_List
;
14187 Components
: constant Elist_Id
:= New_Elmt_List
;
14188 Comp_Elmt
: Elmt_Id
;
14190 Comp_List
: Node_Id
;
14192 Discr_Val
: Node_Id
;
14194 Report_Errors
: Boolean;
14195 pragma Warnings
(Off
, Report_Errors
);
14198 if Serious_Errors_Detected
> 0 then
14202 if Is_Record_Type
(Typ
)
14203 and then Nkind
(Parent
(Typ
)) = N_Full_Type_Declaration
14204 and then Nkind
(Type_Definition
(Parent
(Typ
))) = N_Record_Definition
14206 Comp_List
:= Component_List
(Type_Definition
(Parent
(Typ
)));
14208 Discr
:= First_Discriminant
(Typ
);
14209 while Present
(Discr
) loop
14210 if Nkind
(Parent
(Discr
)) = N_Discriminant_Specification
then
14211 Discr_Val
:= Expression
(Parent
(Discr
));
14213 if Present
(Discr_Val
)
14214 and then Is_OK_Static_Expression
(Discr_Val
)
14216 Append_To
(Constraints
,
14217 Make_Component_Association
(Loc
,
14218 Choices
=> New_List
(New_Occurrence_Of
(Discr
, Loc
)),
14219 Expression
=> New_Copy
(Discr_Val
)));
14227 Next_Discriminant
(Discr
);
14232 Comp_List
=> Comp_List
,
14233 Governed_By
=> Constraints
,
14234 Into
=> Components
,
14235 Report_Errors
=> Report_Errors
);
14237 -- Check that each component present is fully initialized
14239 Comp_Elmt
:= First_Elmt
(Components
);
14240 while Present
(Comp_Elmt
) loop
14241 Comp_Id
:= Node
(Comp_Elmt
);
14243 if Ekind
(Comp_Id
) = E_Component
14244 and then (No
(Parent
(Comp_Id
))
14245 or else No
(Expression
(Parent
(Comp_Id
))))
14246 and then not Is_Fully_Initialized_Type
(Etype
(Comp_Id
))
14251 Next_Elmt
(Comp_Elmt
);
14256 elsif Is_Private_Type
(Typ
) then
14258 U
: constant Entity_Id
:= Underlying_Type
(Typ
);
14264 return Is_Fully_Initialized_Variant
(U
);
14271 end Is_Fully_Initialized_Variant
;
14273 ------------------------------------
14274 -- Is_Generic_Declaration_Or_Body --
14275 ------------------------------------
14277 function Is_Generic_Declaration_Or_Body
(Decl
: Node_Id
) return Boolean is
14278 Spec_Decl
: Node_Id
;
14281 -- Package/subprogram body
14283 if Nkind_In
(Decl
, N_Package_Body
, N_Subprogram_Body
)
14284 and then Present
(Corresponding_Spec
(Decl
))
14286 Spec_Decl
:= Unit_Declaration_Node
(Corresponding_Spec
(Decl
));
14288 -- Package/subprogram body stub
14290 elsif Nkind_In
(Decl
, N_Package_Body_Stub
, N_Subprogram_Body_Stub
)
14291 and then Present
(Corresponding_Spec_Of_Stub
(Decl
))
14294 Unit_Declaration_Node
(Corresponding_Spec_Of_Stub
(Decl
));
14302 -- Rather than inspecting the defining entity of the spec declaration,
14303 -- look at its Nkind. This takes care of the case where the analysis of
14304 -- a generic body modifies the Ekind of its spec to allow for recursive
14308 Nkind_In
(Spec_Decl
, N_Generic_Package_Declaration
,
14309 N_Generic_Subprogram_Declaration
);
14310 end Is_Generic_Declaration_Or_Body
;
14312 ----------------------------
14313 -- Is_Inherited_Operation --
14314 ----------------------------
14316 function Is_Inherited_Operation
(E
: Entity_Id
) return Boolean is
14317 pragma Assert
(Is_Overloadable
(E
));
14318 Kind
: constant Node_Kind
:= Nkind
(Parent
(E
));
14320 return Kind
= N_Full_Type_Declaration
14321 or else Kind
= N_Private_Extension_Declaration
14322 or else Kind
= N_Subtype_Declaration
14323 or else (Ekind
(E
) = E_Enumeration_Literal
14324 and then Is_Derived_Type
(Etype
(E
)));
14325 end Is_Inherited_Operation
;
14327 -------------------------------------
14328 -- Is_Inherited_Operation_For_Type --
14329 -------------------------------------
14331 function Is_Inherited_Operation_For_Type
14333 Typ
: Entity_Id
) return Boolean
14336 -- Check that the operation has been created by the type declaration
14338 return Is_Inherited_Operation
(E
)
14339 and then Defining_Identifier
(Parent
(E
)) = Typ
;
14340 end Is_Inherited_Operation_For_Type
;
14342 --------------------------------------
14343 -- Is_Inlinable_Expression_Function --
14344 --------------------------------------
14346 function Is_Inlinable_Expression_Function
14347 (Subp
: Entity_Id
) return Boolean
14349 Return_Expr
: Node_Id
;
14352 if Is_Expression_Function_Or_Completion
(Subp
)
14353 and then Has_Pragma_Inline_Always
(Subp
)
14354 and then Needs_No_Actuals
(Subp
)
14355 and then No
(Contract
(Subp
))
14356 and then not Is_Dispatching_Operation
(Subp
)
14357 and then Needs_Finalization
(Etype
(Subp
))
14358 and then not Is_Class_Wide_Type
(Etype
(Subp
))
14359 and then not (Has_Invariants
(Etype
(Subp
)))
14360 and then Present
(Subprogram_Body
(Subp
))
14361 and then Was_Expression_Function
(Subprogram_Body
(Subp
))
14363 Return_Expr
:= Expression_Of_Expression_Function
(Subp
);
14365 -- The returned object must not have a qualified expression and its
14366 -- nominal subtype must be statically compatible with the result
14367 -- subtype of the expression function.
14370 Nkind
(Return_Expr
) = N_Identifier
14371 and then Etype
(Return_Expr
) = Etype
(Subp
);
14375 end Is_Inlinable_Expression_Function
;
14381 function Is_Iterator
(Typ
: Entity_Id
) return Boolean is
14382 function Denotes_Iterator
(Iter_Typ
: Entity_Id
) return Boolean;
14383 -- Determine whether type Iter_Typ is a predefined forward or reversible
14386 ----------------------
14387 -- Denotes_Iterator --
14388 ----------------------
14390 function Denotes_Iterator
(Iter_Typ
: Entity_Id
) return Boolean is
14392 -- Check that the name matches, and that the ultimate ancestor is in
14393 -- a predefined unit, i.e the one that declares iterator interfaces.
14396 Nam_In
(Chars
(Iter_Typ
), Name_Forward_Iterator
,
14397 Name_Reversible_Iterator
)
14398 and then In_Predefined_Unit
(Root_Type
(Iter_Typ
));
14399 end Denotes_Iterator
;
14403 Iface_Elmt
: Elmt_Id
;
14406 -- Start of processing for Is_Iterator
14409 -- The type may be a subtype of a descendant of the proper instance of
14410 -- the predefined interface type, so we must use the root type of the
14411 -- given type. The same is done for Is_Reversible_Iterator.
14413 if Is_Class_Wide_Type
(Typ
)
14414 and then Denotes_Iterator
(Root_Type
(Typ
))
14418 elsif not Is_Tagged_Type
(Typ
) or else not Is_Derived_Type
(Typ
) then
14421 elsif Present
(Find_Value_Of_Aspect
(Typ
, Aspect_Iterable
)) then
14425 Collect_Interfaces
(Typ
, Ifaces
);
14427 Iface_Elmt
:= First_Elmt
(Ifaces
);
14428 while Present
(Iface_Elmt
) loop
14429 if Denotes_Iterator
(Node
(Iface_Elmt
)) then
14433 Next_Elmt
(Iface_Elmt
);
14440 ----------------------------
14441 -- Is_Iterator_Over_Array --
14442 ----------------------------
14444 function Is_Iterator_Over_Array
(N
: Node_Id
) return Boolean is
14445 Container
: constant Node_Id
:= Name
(N
);
14446 Container_Typ
: constant Entity_Id
:= Base_Type
(Etype
(Container
));
14448 return Is_Array_Type
(Container_Typ
);
14449 end Is_Iterator_Over_Array
;
14455 -- We seem to have a lot of overlapping functions that do similar things
14456 -- (testing for left hand sides or lvalues???).
14458 function Is_LHS
(N
: Node_Id
) return Is_LHS_Result
is
14459 P
: constant Node_Id
:= Parent
(N
);
14462 -- Return True if we are the left hand side of an assignment statement
14464 if Nkind
(P
) = N_Assignment_Statement
then
14465 if Name
(P
) = N
then
14471 -- Case of prefix of indexed or selected component or slice
14473 elsif Nkind_In
(P
, N_Indexed_Component
, N_Selected_Component
, N_Slice
)
14474 and then N
= Prefix
(P
)
14476 -- Here we have the case where the parent P is N.Q or N(Q .. R).
14477 -- If P is an LHS, then N is also effectively an LHS, but there
14478 -- is an important exception. If N is of an access type, then
14479 -- what we really have is N.all.Q (or N.all(Q .. R)). In either
14480 -- case this makes N.all a left hand side but not N itself.
14482 -- If we don't know the type yet, this is the case where we return
14483 -- Unknown, since the answer depends on the type which is unknown.
14485 if No
(Etype
(N
)) then
14488 -- We have an Etype set, so we can check it
14490 elsif Is_Access_Type
(Etype
(N
)) then
14493 -- OK, not access type case, so just test whole expression
14499 -- All other cases are not left hand sides
14506 -----------------------------
14507 -- Is_Library_Level_Entity --
14508 -----------------------------
14510 function Is_Library_Level_Entity
(E
: Entity_Id
) return Boolean is
14512 -- The following is a small optimization, and it also properly handles
14513 -- discriminals, which in task bodies might appear in expressions before
14514 -- the corresponding procedure has been created, and which therefore do
14515 -- not have an assigned scope.
14517 if Is_Formal
(E
) then
14521 -- Normal test is simply that the enclosing dynamic scope is Standard
14523 return Enclosing_Dynamic_Scope
(E
) = Standard_Standard
;
14524 end Is_Library_Level_Entity
;
14526 --------------------------------
14527 -- Is_Limited_Class_Wide_Type --
14528 --------------------------------
14530 function Is_Limited_Class_Wide_Type
(Typ
: Entity_Id
) return Boolean is
14533 Is_Class_Wide_Type
(Typ
)
14534 and then (Is_Limited_Type
(Typ
) or else From_Limited_With
(Typ
));
14535 end Is_Limited_Class_Wide_Type
;
14537 ---------------------------------
14538 -- Is_Local_Variable_Reference --
14539 ---------------------------------
14541 function Is_Local_Variable_Reference
(Expr
: Node_Id
) return Boolean is
14543 if not Is_Entity_Name
(Expr
) then
14548 Ent
: constant Entity_Id
:= Entity
(Expr
);
14549 Sub
: constant Entity_Id
:= Enclosing_Subprogram
(Ent
);
14551 if not Ekind_In
(Ent
, E_Variable
, E_In_Out_Parameter
) then
14554 return Present
(Sub
) and then Sub
= Current_Subprogram
;
14558 end Is_Local_Variable_Reference
;
14560 -----------------------
14561 -- Is_Name_Reference --
14562 -----------------------
14564 function Is_Name_Reference
(N
: Node_Id
) return Boolean is
14566 if Is_Entity_Name
(N
) then
14567 return Present
(Entity
(N
)) and then Is_Object
(Entity
(N
));
14571 when N_Indexed_Component
14575 Is_Name_Reference
(Prefix
(N
))
14576 or else Is_Access_Type
(Etype
(Prefix
(N
)));
14578 -- Attributes 'Input, 'Old and 'Result produce objects
14580 when N_Attribute_Reference
=>
14582 Nam_In
(Attribute_Name
(N
), Name_Input
, Name_Old
, Name_Result
);
14584 when N_Selected_Component
=>
14586 Is_Name_Reference
(Selector_Name
(N
))
14588 (Is_Name_Reference
(Prefix
(N
))
14589 or else Is_Access_Type
(Etype
(Prefix
(N
))));
14591 when N_Explicit_Dereference
=>
14594 -- A view conversion of a tagged name is a name reference
14596 when N_Type_Conversion
=>
14598 Is_Tagged_Type
(Etype
(Subtype_Mark
(N
)))
14599 and then Is_Tagged_Type
(Etype
(Expression
(N
)))
14600 and then Is_Name_Reference
(Expression
(N
));
14602 -- An unchecked type conversion is considered to be a name if the
14603 -- operand is a name (this construction arises only as a result of
14604 -- expansion activities).
14606 when N_Unchecked_Type_Conversion
=>
14607 return Is_Name_Reference
(Expression
(N
));
14612 end Is_Name_Reference
;
14614 ------------------------------------
14615 -- Is_Non_Preelaborable_Construct --
14616 ------------------------------------
14618 function Is_Non_Preelaborable_Construct
(N
: Node_Id
) return Boolean is
14620 -- NOTE: the routines within Is_Non_Preelaborable_Construct are
14621 -- intentionally unnested to avoid deep indentation of code.
14623 Non_Preelaborable
: exception;
14624 -- This exception is raised when the construct violates preelaborability
14625 -- to terminate the recursion.
14627 procedure Visit
(Nod
: Node_Id
);
14628 -- Semantically inspect construct Nod to determine whether it violates
14629 -- preelaborability. This routine raises Non_Preelaborable.
14631 procedure Visit_List
(List
: List_Id
);
14632 pragma Inline
(Visit_List
);
14633 -- Invoke Visit on each element of list List. This routine raises
14634 -- Non_Preelaborable.
14636 procedure Visit_Pragma
(Prag
: Node_Id
);
14637 pragma Inline
(Visit_Pragma
);
14638 -- Semantically inspect pragma Prag to determine whether it violates
14639 -- preelaborability. This routine raises Non_Preelaborable.
14641 procedure Visit_Subexpression
(Expr
: Node_Id
);
14642 pragma Inline
(Visit_Subexpression
);
14643 -- Semantically inspect expression Expr to determine whether it violates
14644 -- preelaborability. This routine raises Non_Preelaborable.
14650 procedure Visit
(Nod
: Node_Id
) is
14652 case Nkind
(Nod
) is
14656 when N_Component_Declaration
=>
14658 -- Defining_Identifier is left out because it is not relevant
14659 -- for preelaborability.
14661 Visit
(Component_Definition
(Nod
));
14662 Visit
(Expression
(Nod
));
14664 when N_Derived_Type_Definition
=>
14666 -- Interface_List is left out because it is not relevant for
14667 -- preelaborability.
14669 Visit
(Record_Extension_Part
(Nod
));
14670 Visit
(Subtype_Indication
(Nod
));
14672 when N_Entry_Declaration
=>
14674 -- A protected type with at leat one entry is not preelaborable
14675 -- while task types are never preelaborable. This renders entry
14676 -- declarations non-preelaborable.
14678 raise Non_Preelaborable
;
14680 when N_Full_Type_Declaration
=>
14682 -- Defining_Identifier and Discriminant_Specifications are left
14683 -- out because they are not relevant for preelaborability.
14685 Visit
(Type_Definition
(Nod
));
14687 when N_Function_Instantiation
14688 | N_Package_Instantiation
14689 | N_Procedure_Instantiation
14691 -- Defining_Unit_Name and Name are left out because they are
14692 -- not relevant for preelaborability.
14694 Visit_List
(Generic_Associations
(Nod
));
14696 when N_Object_Declaration
=>
14698 -- Defining_Identifier is left out because it is not relevant
14699 -- for preelaborability.
14701 Visit
(Object_Definition
(Nod
));
14703 if Has_Init_Expression
(Nod
) then
14704 Visit
(Expression
(Nod
));
14706 elsif not Has_Preelaborable_Initialization
14707 (Etype
(Defining_Entity
(Nod
)))
14709 raise Non_Preelaborable
;
14712 when N_Private_Extension_Declaration
14713 | N_Subtype_Declaration
14715 -- Defining_Identifier, Discriminant_Specifications, and
14716 -- Interface_List are left out because they are not relevant
14717 -- for preelaborability.
14719 Visit
(Subtype_Indication
(Nod
));
14721 when N_Protected_Type_Declaration
14722 | N_Single_Protected_Declaration
14724 -- Defining_Identifier, Discriminant_Specifications, and
14725 -- Interface_List are left out because they are not relevant
14726 -- for preelaborability.
14728 Visit
(Protected_Definition
(Nod
));
14730 -- A [single] task type is never preelaborable
14732 when N_Single_Task_Declaration
14733 | N_Task_Type_Declaration
14735 raise Non_Preelaborable
;
14740 Visit_Pragma
(Nod
);
14744 when N_Statement_Other_Than_Procedure_Call
=>
14745 if Nkind
(Nod
) /= N_Null_Statement
then
14746 raise Non_Preelaborable
;
14752 Visit_Subexpression
(Nod
);
14756 when N_Access_To_Object_Definition
=>
14757 Visit
(Subtype_Indication
(Nod
));
14759 when N_Case_Expression_Alternative
=>
14760 Visit
(Expression
(Nod
));
14761 Visit_List
(Discrete_Choices
(Nod
));
14763 when N_Component_Definition
=>
14764 Visit
(Access_Definition
(Nod
));
14765 Visit
(Subtype_Indication
(Nod
));
14767 when N_Component_List
=>
14768 Visit_List
(Component_Items
(Nod
));
14769 Visit
(Variant_Part
(Nod
));
14771 when N_Constrained_Array_Definition
=>
14772 Visit_List
(Discrete_Subtype_Definitions
(Nod
));
14773 Visit
(Component_Definition
(Nod
));
14775 when N_Delta_Constraint
14776 | N_Digits_Constraint
14778 -- Delta_Expression and Digits_Expression are left out because
14779 -- they are not relevant for preelaborability.
14781 Visit
(Range_Constraint
(Nod
));
14783 when N_Discriminant_Specification
=>
14785 -- Defining_Identifier and Expression are left out because they
14786 -- are not relevant for preelaborability.
14788 Visit
(Discriminant_Type
(Nod
));
14790 when N_Generic_Association
=>
14792 -- Selector_Name is left out because it is not relevant for
14793 -- preelaborability.
14795 Visit
(Explicit_Generic_Actual_Parameter
(Nod
));
14797 when N_Index_Or_Discriminant_Constraint
=>
14798 Visit_List
(Constraints
(Nod
));
14800 when N_Iterator_Specification
=>
14802 -- Defining_Identifier is left out because it is not relevant
14803 -- for preelaborability.
14805 Visit
(Name
(Nod
));
14806 Visit
(Subtype_Indication
(Nod
));
14808 when N_Loop_Parameter_Specification
=>
14810 -- Defining_Identifier is left out because it is not relevant
14811 -- for preelaborability.
14813 Visit
(Discrete_Subtype_Definition
(Nod
));
14815 when N_Protected_Definition
=>
14817 -- End_Label is left out because it is not relevant for
14818 -- preelaborability.
14820 Visit_List
(Private_Declarations
(Nod
));
14821 Visit_List
(Visible_Declarations
(Nod
));
14823 when N_Range_Constraint
=>
14824 Visit
(Range_Expression
(Nod
));
14826 when N_Record_Definition
14829 -- End_Label, Discrete_Choices, and Interface_List are left out
14830 -- because they are not relevant for preelaborability.
14832 Visit
(Component_List
(Nod
));
14834 when N_Subtype_Indication
=>
14836 -- Subtype_Mark is left out because it is not relevant for
14837 -- preelaborability.
14839 Visit
(Constraint
(Nod
));
14841 when N_Unconstrained_Array_Definition
=>
14843 -- Subtype_Marks is left out because it is not relevant for
14844 -- preelaborability.
14846 Visit
(Component_Definition
(Nod
));
14848 when N_Variant_Part
=>
14850 -- Name is left out because it is not relevant for
14851 -- preelaborability.
14853 Visit_List
(Variants
(Nod
));
14866 procedure Visit_List
(List
: List_Id
) is
14870 if Present
(List
) then
14871 Nod
:= First
(List
);
14872 while Present
(Nod
) loop
14883 procedure Visit_Pragma
(Prag
: Node_Id
) is
14885 case Get_Pragma_Id
(Prag
) is
14887 | Pragma_Assert_And_Cut
14889 | Pragma_Async_Readers
14890 | Pragma_Async_Writers
14891 | Pragma_Attribute_Definition
14893 | Pragma_Constant_After_Elaboration
14895 | Pragma_Deadline_Floor
14896 | Pragma_Dispatching_Domain
14897 | Pragma_Effective_Reads
14898 | Pragma_Effective_Writes
14899 | Pragma_Extensions_Visible
14901 | Pragma_Secondary_Stack_Size
14903 | Pragma_Volatile_Function
14905 Visit_List
(Pragma_Argument_Associations
(Prag
));
14914 -------------------------
14915 -- Visit_Subexpression --
14916 -------------------------
14918 procedure Visit_Subexpression
(Expr
: Node_Id
) is
14919 procedure Visit_Aggregate
(Aggr
: Node_Id
);
14920 pragma Inline
(Visit_Aggregate
);
14921 -- Semantically inspect aggregate Aggr to determine whether it
14922 -- violates preelaborability.
14924 ---------------------
14925 -- Visit_Aggregate --
14926 ---------------------
14928 procedure Visit_Aggregate
(Aggr
: Node_Id
) is
14930 if not Is_Preelaborable_Aggregate
(Aggr
) then
14931 raise Non_Preelaborable
;
14933 end Visit_Aggregate
;
14935 -- Start of processing for Visit_Subexpression
14938 case Nkind
(Expr
) is
14940 | N_Qualified_Expression
14941 | N_Type_Conversion
14942 | N_Unchecked_Expression
14943 | N_Unchecked_Type_Conversion
14945 -- Subpool_Handle_Name and Subtype_Mark are left out because
14946 -- they are not relevant for preelaborability.
14948 Visit
(Expression
(Expr
));
14951 | N_Extension_Aggregate
14953 Visit_Aggregate
(Expr
);
14955 when N_Attribute_Reference
14956 | N_Explicit_Dereference
14959 -- Attribute_Name and Expressions are left out because they are
14960 -- not relevant for preelaborability.
14962 Visit
(Prefix
(Expr
));
14964 when N_Case_Expression
=>
14966 -- End_Span is left out because it is not relevant for
14967 -- preelaborability.
14969 Visit_List
(Alternatives
(Expr
));
14970 Visit
(Expression
(Expr
));
14972 when N_Delta_Aggregate
=>
14973 Visit_Aggregate
(Expr
);
14974 Visit
(Expression
(Expr
));
14976 when N_Expression_With_Actions
=>
14977 Visit_List
(Actions
(Expr
));
14978 Visit
(Expression
(Expr
));
14980 when N_If_Expression
=>
14981 Visit_List
(Expressions
(Expr
));
14983 when N_Quantified_Expression
=>
14984 Visit
(Condition
(Expr
));
14985 Visit
(Iterator_Specification
(Expr
));
14986 Visit
(Loop_Parameter_Specification
(Expr
));
14989 Visit
(High_Bound
(Expr
));
14990 Visit
(Low_Bound
(Expr
));
14993 Visit
(Discrete_Range
(Expr
));
14994 Visit
(Prefix
(Expr
));
15000 -- The evaluation of an object name is not preelaborable,
15001 -- unless the name is a static expression (checked further
15002 -- below), or statically denotes a discriminant.
15004 if Is_Entity_Name
(Expr
) then
15005 Object_Name
: declare
15006 Id
: constant Entity_Id
:= Entity
(Expr
);
15009 if Is_Object
(Id
) then
15010 if Ekind
(Id
) = E_Discriminant
then
15013 elsif Ekind_In
(Id
, E_Constant
, E_In_Parameter
)
15014 and then Present
(Discriminal_Link
(Id
))
15019 raise Non_Preelaborable
;
15024 -- A non-static expression is not preelaborable
15026 elsif not Is_OK_Static_Expression
(Expr
) then
15027 raise Non_Preelaborable
;
15030 end Visit_Subexpression
;
15032 -- Start of processing for Is_Non_Preelaborable_Construct
15037 -- At this point it is known that the construct is preelaborable
15043 -- The elaboration of the construct performs an action which violates
15044 -- preelaborability.
15046 when Non_Preelaborable
=>
15048 end Is_Non_Preelaborable_Construct
;
15050 ---------------------------------
15051 -- Is_Nontrivial_DIC_Procedure --
15052 ---------------------------------
15054 function Is_Nontrivial_DIC_Procedure
(Id
: Entity_Id
) return Boolean is
15055 Body_Decl
: Node_Id
;
15059 if Ekind
(Id
) = E_Procedure
and then Is_DIC_Procedure
(Id
) then
15061 Unit_Declaration_Node
15062 (Corresponding_Body
(Unit_Declaration_Node
(Id
)));
15064 -- The body of the Default_Initial_Condition procedure must contain
15065 -- at least one statement, otherwise the generation of the subprogram
15068 pragma Assert
(Present
(Handled_Statement_Sequence
(Body_Decl
)));
15070 -- To qualify as nontrivial, the first statement of the procedure
15071 -- must be a check in the form of an if statement. If the original
15072 -- Default_Initial_Condition expression was folded, then the first
15073 -- statement is not a check.
15075 Stmt
:= First
(Statements
(Handled_Statement_Sequence
(Body_Decl
)));
15078 Nkind
(Stmt
) = N_If_Statement
15079 and then Nkind
(Original_Node
(Stmt
)) = N_Pragma
;
15083 end Is_Nontrivial_DIC_Procedure
;
15085 -------------------------
15086 -- Is_Null_Record_Type --
15087 -------------------------
15089 function Is_Null_Record_Type
(T
: Entity_Id
) return Boolean is
15090 Decl
: constant Node_Id
:= Parent
(T
);
15092 return Nkind
(Decl
) = N_Full_Type_Declaration
15093 and then Nkind
(Type_Definition
(Decl
)) = N_Record_Definition
15095 (No
(Component_List
(Type_Definition
(Decl
)))
15096 or else Null_Present
(Component_List
(Type_Definition
(Decl
))));
15097 end Is_Null_Record_Type
;
15099 ---------------------
15100 -- Is_Object_Image --
15101 ---------------------
15103 function Is_Object_Image
(Prefix
: Node_Id
) return Boolean is
15105 -- When the type of the prefix is not scalar, then the prefix is not
15106 -- valid in any scenario.
15108 if not Is_Scalar_Type
(Etype
(Prefix
)) then
15112 -- Here we test for the case that the prefix is not a type and assume
15113 -- if it is not then it must be a named value or an object reference.
15114 -- This is because the parser always checks that prefixes of attributes
15117 return not (Is_Entity_Name
(Prefix
) and then Is_Type
(Entity
(Prefix
)));
15118 end Is_Object_Image
;
15120 -------------------------
15121 -- Is_Object_Reference --
15122 -------------------------
15124 function Is_Object_Reference
(N
: Node_Id
) return Boolean is
15125 function Is_Internally_Generated_Renaming
(N
: Node_Id
) return Boolean;
15126 -- Determine whether N is the name of an internally-generated renaming
15128 --------------------------------------
15129 -- Is_Internally_Generated_Renaming --
15130 --------------------------------------
15132 function Is_Internally_Generated_Renaming
(N
: Node_Id
) return Boolean is
15137 while Present
(P
) loop
15138 if Nkind
(P
) = N_Object_Renaming_Declaration
then
15139 return not Comes_From_Source
(P
);
15140 elsif Is_List_Member
(P
) then
15148 end Is_Internally_Generated_Renaming
;
15150 -- Start of processing for Is_Object_Reference
15153 if Is_Entity_Name
(N
) then
15154 return Present
(Entity
(N
)) and then Is_Object
(Entity
(N
));
15158 when N_Indexed_Component
15162 Is_Object_Reference
(Prefix
(N
))
15163 or else Is_Access_Type
(Etype
(Prefix
(N
)));
15165 -- In Ada 95, a function call is a constant object; a procedure
15168 -- Note that predefined operators are functions as well, and so
15169 -- are attributes that are (can be renamed as) functions.
15175 return Etype
(N
) /= Standard_Void_Type
;
15177 -- Attributes references 'Loop_Entry, 'Old, and 'Result yield
15178 -- objects, even though they are not functions.
15180 when N_Attribute_Reference
=>
15182 Nam_In
(Attribute_Name
(N
), Name_Loop_Entry
,
15185 or else Is_Function_Attribute_Name
(Attribute_Name
(N
));
15187 when N_Selected_Component
=>
15189 Is_Object_Reference
(Selector_Name
(N
))
15191 (Is_Object_Reference
(Prefix
(N
))
15192 or else Is_Access_Type
(Etype
(Prefix
(N
))));
15194 -- An explicit dereference denotes an object, except that a
15195 -- conditional expression gets turned into an explicit dereference
15196 -- in some cases, and conditional expressions are not object
15199 when N_Explicit_Dereference
=>
15200 return not Nkind_In
(Original_Node
(N
), N_Case_Expression
,
15203 -- A view conversion of a tagged object is an object reference
15205 when N_Type_Conversion
=>
15206 return Is_Tagged_Type
(Etype
(Subtype_Mark
(N
)))
15207 and then Is_Tagged_Type
(Etype
(Expression
(N
)))
15208 and then Is_Object_Reference
(Expression
(N
));
15210 -- An unchecked type conversion is considered to be an object if
15211 -- the operand is an object (this construction arises only as a
15212 -- result of expansion activities).
15214 when N_Unchecked_Type_Conversion
=>
15217 -- Allow string literals to act as objects as long as they appear
15218 -- in internally-generated renamings. The expansion of iterators
15219 -- may generate such renamings when the range involves a string
15222 when N_String_Literal
=>
15223 return Is_Internally_Generated_Renaming
(Parent
(N
));
15225 -- AI05-0003: In Ada 2012 a qualified expression is a name.
15226 -- This allows disambiguation of function calls and the use
15227 -- of aggregates in more contexts.
15229 when N_Qualified_Expression
=>
15230 if Ada_Version
< Ada_2012
then
15233 return Is_Object_Reference
(Expression
(N
))
15234 or else Nkind
(Expression
(N
)) = N_Aggregate
;
15241 end Is_Object_Reference
;
15243 -----------------------------------
15244 -- Is_OK_Variable_For_Out_Formal --
15245 -----------------------------------
15247 function Is_OK_Variable_For_Out_Formal
(AV
: Node_Id
) return Boolean is
15249 Note_Possible_Modification
(AV
, Sure
=> True);
15251 -- We must reject parenthesized variable names. Comes_From_Source is
15252 -- checked because there are currently cases where the compiler violates
15253 -- this rule (e.g. passing a task object to its controlled Initialize
15254 -- routine). This should be properly documented in sinfo???
15256 if Paren_Count
(AV
) > 0 and then Comes_From_Source
(AV
) then
15259 -- A variable is always allowed
15261 elsif Is_Variable
(AV
) then
15264 -- Generalized indexing operations are rewritten as explicit
15265 -- dereferences, and it is only during resolution that we can
15266 -- check whether the context requires an access_to_variable type.
15268 elsif Nkind
(AV
) = N_Explicit_Dereference
15269 and then Ada_Version
>= Ada_2012
15270 and then Nkind
(Original_Node
(AV
)) = N_Indexed_Component
15271 and then Present
(Etype
(Original_Node
(AV
)))
15272 and then Has_Implicit_Dereference
(Etype
(Original_Node
(AV
)))
15274 return not Is_Access_Constant
(Etype
(Prefix
(AV
)));
15276 -- Unchecked conversions are allowed only if they come from the
15277 -- generated code, which sometimes uses unchecked conversions for out
15278 -- parameters in cases where code generation is unaffected. We tell
15279 -- source unchecked conversions by seeing if they are rewrites of
15280 -- an original Unchecked_Conversion function call, or of an explicit
15281 -- conversion of a function call or an aggregate (as may happen in the
15282 -- expansion of a packed array aggregate).
15284 elsif Nkind
(AV
) = N_Unchecked_Type_Conversion
then
15285 if Nkind_In
(Original_Node
(AV
), N_Function_Call
, N_Aggregate
) then
15288 elsif Comes_From_Source
(AV
)
15289 and then Nkind
(Original_Node
(Expression
(AV
))) = N_Function_Call
15293 elsif Nkind
(Original_Node
(AV
)) = N_Type_Conversion
then
15294 return Is_OK_Variable_For_Out_Formal
(Expression
(AV
));
15300 -- Normal type conversions are allowed if argument is a variable
15302 elsif Nkind
(AV
) = N_Type_Conversion
then
15303 if Is_Variable
(Expression
(AV
))
15304 and then Paren_Count
(Expression
(AV
)) = 0
15306 Note_Possible_Modification
(Expression
(AV
), Sure
=> True);
15309 -- We also allow a non-parenthesized expression that raises
15310 -- constraint error if it rewrites what used to be a variable
15312 elsif Raises_Constraint_Error
(Expression
(AV
))
15313 and then Paren_Count
(Expression
(AV
)) = 0
15314 and then Is_Variable
(Original_Node
(Expression
(AV
)))
15318 -- Type conversion of something other than a variable
15324 -- If this node is rewritten, then test the original form, if that is
15325 -- OK, then we consider the rewritten node OK (for example, if the
15326 -- original node is a conversion, then Is_Variable will not be true
15327 -- but we still want to allow the conversion if it converts a variable).
15329 elsif Original_Node
(AV
) /= AV
then
15331 -- In Ada 2012, the explicit dereference may be a rewritten call to a
15332 -- Reference function.
15334 if Ada_Version
>= Ada_2012
15335 and then Nkind
(Original_Node
(AV
)) = N_Function_Call
15337 Has_Implicit_Dereference
(Etype
(Name
(Original_Node
(AV
))))
15340 -- Check that this is not a constant reference.
15342 return not Is_Access_Constant
(Etype
(Prefix
(AV
)));
15344 elsif Has_Implicit_Dereference
(Etype
(Original_Node
(AV
))) then
15346 not Is_Access_Constant
(Etype
15347 (Get_Reference_Discriminant
(Etype
(Original_Node
(AV
)))));
15350 return Is_OK_Variable_For_Out_Formal
(Original_Node
(AV
));
15353 -- All other non-variables are rejected
15358 end Is_OK_Variable_For_Out_Formal
;
15360 ----------------------------
15361 -- Is_OK_Volatile_Context --
15362 ----------------------------
15364 function Is_OK_Volatile_Context
15365 (Context
: Node_Id
;
15366 Obj_Ref
: Node_Id
) return Boolean
15368 function Is_Protected_Operation_Call
(Nod
: Node_Id
) return Boolean;
15369 -- Determine whether an arbitrary node denotes a call to a protected
15370 -- entry, function, or procedure in prefixed form where the prefix is
15373 function Within_Check
(Nod
: Node_Id
) return Boolean;
15374 -- Determine whether an arbitrary node appears in a check node
15376 function Within_Volatile_Function
(Id
: Entity_Id
) return Boolean;
15377 -- Determine whether an arbitrary entity appears in a volatile function
15379 ---------------------------------
15380 -- Is_Protected_Operation_Call --
15381 ---------------------------------
15383 function Is_Protected_Operation_Call
(Nod
: Node_Id
) return Boolean is
15388 -- A call to a protected operations retains its selected component
15389 -- form as opposed to other prefixed calls that are transformed in
15392 if Nkind
(Nod
) = N_Selected_Component
then
15393 Pref
:= Prefix
(Nod
);
15394 Subp
:= Selector_Name
(Nod
);
15398 and then Present
(Etype
(Pref
))
15399 and then Is_Protected_Type
(Etype
(Pref
))
15400 and then Is_Entity_Name
(Subp
)
15401 and then Present
(Entity
(Subp
))
15402 and then Ekind_In
(Entity
(Subp
), E_Entry
,
15409 end Is_Protected_Operation_Call
;
15415 function Within_Check
(Nod
: Node_Id
) return Boolean is
15419 -- Climb the parent chain looking for a check node
15422 while Present
(Par
) loop
15423 if Nkind
(Par
) in N_Raise_xxx_Error
then
15426 -- Prevent the search from going too far
15428 elsif Is_Body_Or_Package_Declaration
(Par
) then
15432 Par
:= Parent
(Par
);
15438 ------------------------------
15439 -- Within_Volatile_Function --
15440 ------------------------------
15442 function Within_Volatile_Function
(Id
: Entity_Id
) return Boolean is
15443 Func_Id
: Entity_Id
;
15446 -- Traverse the scope stack looking for a [generic] function
15449 while Present
(Func_Id
) and then Func_Id
/= Standard_Standard
loop
15450 if Ekind_In
(Func_Id
, E_Function
, E_Generic_Function
) then
15451 return Is_Volatile_Function
(Func_Id
);
15454 Func_Id
:= Scope
(Func_Id
);
15458 end Within_Volatile_Function
;
15462 Obj_Id
: Entity_Id
;
15464 -- Start of processing for Is_OK_Volatile_Context
15467 -- The volatile object appears on either side of an assignment
15469 if Nkind
(Context
) = N_Assignment_Statement
then
15472 -- The volatile object is part of the initialization expression of
15475 elsif Nkind
(Context
) = N_Object_Declaration
15476 and then Present
(Expression
(Context
))
15477 and then Expression
(Context
) = Obj_Ref
15479 Obj_Id
:= Defining_Entity
(Context
);
15481 -- The volatile object acts as the initialization expression of an
15482 -- extended return statement. This is valid context as long as the
15483 -- function is volatile.
15485 if Is_Return_Object
(Obj_Id
) then
15486 return Within_Volatile_Function
(Obj_Id
);
15488 -- Otherwise this is a normal object initialization
15494 -- The volatile object acts as the name of a renaming declaration
15496 elsif Nkind
(Context
) = N_Object_Renaming_Declaration
15497 and then Name
(Context
) = Obj_Ref
15501 -- The volatile object appears as an actual parameter in a call to an
15502 -- instance of Unchecked_Conversion whose result is renamed.
15504 elsif Nkind
(Context
) = N_Function_Call
15505 and then Is_Entity_Name
(Name
(Context
))
15506 and then Is_Unchecked_Conversion_Instance
(Entity
(Name
(Context
)))
15507 and then Nkind
(Parent
(Context
)) = N_Object_Renaming_Declaration
15511 -- The volatile object is actually the prefix in a protected entry,
15512 -- function, or procedure call.
15514 elsif Is_Protected_Operation_Call
(Context
) then
15517 -- The volatile object appears as the expression of a simple return
15518 -- statement that applies to a volatile function.
15520 elsif Nkind
(Context
) = N_Simple_Return_Statement
15521 and then Expression
(Context
) = Obj_Ref
15524 Within_Volatile_Function
(Return_Statement_Entity
(Context
));
15526 -- The volatile object appears as the prefix of a name occurring in a
15527 -- non-interfering context.
15529 elsif Nkind_In
(Context
, N_Attribute_Reference
,
15530 N_Explicit_Dereference
,
15531 N_Indexed_Component
,
15532 N_Selected_Component
,
15534 and then Prefix
(Context
) = Obj_Ref
15535 and then Is_OK_Volatile_Context
15536 (Context
=> Parent
(Context
),
15537 Obj_Ref
=> Context
)
15541 -- The volatile object appears as the prefix of attributes Address,
15542 -- Alignment, Component_Size, First_Bit, Last_Bit, Position, Size,
15545 elsif Nkind
(Context
) = N_Attribute_Reference
15546 and then Prefix
(Context
) = Obj_Ref
15547 and then Nam_In
(Attribute_Name
(Context
), Name_Address
,
15549 Name_Component_Size
,
15558 -- The volatile object appears as the expression of a type conversion
15559 -- occurring in a non-interfering context.
15561 elsif Nkind_In
(Context
, N_Type_Conversion
,
15562 N_Unchecked_Type_Conversion
)
15563 and then Expression
(Context
) = Obj_Ref
15564 and then Is_OK_Volatile_Context
15565 (Context
=> Parent
(Context
),
15566 Obj_Ref
=> Context
)
15570 -- The volatile object appears as the expression in a delay statement
15572 elsif Nkind
(Context
) in N_Delay_Statement
then
15575 -- Allow references to volatile objects in various checks. This is not a
15576 -- direct SPARK 2014 requirement.
15578 elsif Within_Check
(Context
) then
15581 -- Assume that references to effectively volatile objects that appear
15582 -- as actual parameters in a subprogram call are always legal. A full
15583 -- legality check is done when the actuals are resolved (see routine
15584 -- Resolve_Actuals).
15586 elsif Within_Subprogram_Call
(Context
) then
15589 -- Otherwise the context is not suitable for an effectively volatile
15595 end Is_OK_Volatile_Context
;
15597 ------------------------------------
15598 -- Is_Package_Contract_Annotation --
15599 ------------------------------------
15601 function Is_Package_Contract_Annotation
(Item
: Node_Id
) return Boolean is
15605 if Nkind
(Item
) = N_Aspect_Specification
then
15606 Nam
:= Chars
(Identifier
(Item
));
15608 else pragma Assert
(Nkind
(Item
) = N_Pragma
);
15609 Nam
:= Pragma_Name
(Item
);
15612 return Nam
= Name_Abstract_State
15613 or else Nam
= Name_Initial_Condition
15614 or else Nam
= Name_Initializes
15615 or else Nam
= Name_Refined_State
;
15616 end Is_Package_Contract_Annotation
;
15618 -----------------------------------
15619 -- Is_Partially_Initialized_Type --
15620 -----------------------------------
15622 function Is_Partially_Initialized_Type
15624 Include_Implicit
: Boolean := True) return Boolean
15627 if Is_Scalar_Type
(Typ
) then
15630 elsif Is_Access_Type
(Typ
) then
15631 return Include_Implicit
;
15633 elsif Is_Array_Type
(Typ
) then
15635 -- If component type is partially initialized, so is array type
15637 if Is_Partially_Initialized_Type
15638 (Component_Type
(Typ
), Include_Implicit
)
15642 -- Otherwise we are only partially initialized if we are fully
15643 -- initialized (this is the empty array case, no point in us
15644 -- duplicating that code here).
15647 return Is_Fully_Initialized_Type
(Typ
);
15650 elsif Is_Record_Type
(Typ
) then
15652 -- A discriminated type is always partially initialized if in
15655 if Has_Discriminants
(Typ
) and then Include_Implicit
then
15658 -- A tagged type is always partially initialized
15660 elsif Is_Tagged_Type
(Typ
) then
15663 -- Case of non-discriminated record
15669 Component_Present
: Boolean := False;
15670 -- Set True if at least one component is present. If no
15671 -- components are present, then record type is fully
15672 -- initialized (another odd case, like the null array).
15675 -- Loop through components
15677 Ent
:= First_Entity
(Typ
);
15678 while Present
(Ent
) loop
15679 if Ekind
(Ent
) = E_Component
then
15680 Component_Present
:= True;
15682 -- If a component has an initialization expression then
15683 -- the enclosing record type is partially initialized
15685 if Present
(Parent
(Ent
))
15686 and then Present
(Expression
(Parent
(Ent
)))
15690 -- If a component is of a type which is itself partially
15691 -- initialized, then the enclosing record type is also.
15693 elsif Is_Partially_Initialized_Type
15694 (Etype
(Ent
), Include_Implicit
)
15703 -- No initialized components found. If we found any components
15704 -- they were all uninitialized so the result is false.
15706 if Component_Present
then
15709 -- But if we found no components, then all the components are
15710 -- initialized so we consider the type to be initialized.
15718 -- Concurrent types are always fully initialized
15720 elsif Is_Concurrent_Type
(Typ
) then
15723 -- For a private type, go to underlying type. If there is no underlying
15724 -- type then just assume this partially initialized. Not clear if this
15725 -- can happen in a non-error case, but no harm in testing for this.
15727 elsif Is_Private_Type
(Typ
) then
15729 U
: constant Entity_Id
:= Underlying_Type
(Typ
);
15734 return Is_Partially_Initialized_Type
(U
, Include_Implicit
);
15738 -- For any other type (are there any?) assume partially initialized
15743 end Is_Partially_Initialized_Type
;
15745 ------------------------------------
15746 -- Is_Potentially_Persistent_Type --
15747 ------------------------------------
15749 function Is_Potentially_Persistent_Type
(T
: Entity_Id
) return Boolean is
15754 -- For private type, test corresponding full type
15756 if Is_Private_Type
(T
) then
15757 return Is_Potentially_Persistent_Type
(Full_View
(T
));
15759 -- Scalar types are potentially persistent
15761 elsif Is_Scalar_Type
(T
) then
15764 -- Record type is potentially persistent if not tagged and the types of
15765 -- all it components are potentially persistent, and no component has
15766 -- an initialization expression.
15768 elsif Is_Record_Type
(T
)
15769 and then not Is_Tagged_Type
(T
)
15770 and then not Is_Partially_Initialized_Type
(T
)
15772 Comp
:= First_Component
(T
);
15773 while Present
(Comp
) loop
15774 if not Is_Potentially_Persistent_Type
(Etype
(Comp
)) then
15777 Next_Entity
(Comp
);
15783 -- Array type is potentially persistent if its component type is
15784 -- potentially persistent and if all its constraints are static.
15786 elsif Is_Array_Type
(T
) then
15787 if not Is_Potentially_Persistent_Type
(Component_Type
(T
)) then
15791 Indx
:= First_Index
(T
);
15792 while Present
(Indx
) loop
15793 if not Is_OK_Static_Subtype
(Etype
(Indx
)) then
15802 -- All other types are not potentially persistent
15807 end Is_Potentially_Persistent_Type
;
15809 --------------------------------
15810 -- Is_Potentially_Unevaluated --
15811 --------------------------------
15813 function Is_Potentially_Unevaluated
(N
: Node_Id
) return Boolean is
15821 -- A postcondition whose expression is a short-circuit is broken down
15822 -- into individual aspects for better exception reporting. The original
15823 -- short-circuit expression is rewritten as the second operand, and an
15824 -- occurrence of 'Old in that operand is potentially unevaluated.
15825 -- See sem_ch13.adb for details of this transformation. The reference
15826 -- to 'Old may appear within an expression, so we must look for the
15827 -- enclosing pragma argument in the tree that contains the reference.
15829 while Present
(Par
)
15830 and then Nkind
(Par
) /= N_Pragma_Argument_Association
15832 if Nkind
(Original_Node
(Par
)) = N_And_Then
then
15836 Par
:= Parent
(Par
);
15839 -- Other cases; 'Old appears within other expression (not the top-level
15840 -- conjunct in a postcondition) with a potentially unevaluated operand.
15842 Par
:= Parent
(Expr
);
15844 while not Nkind_In
(Par
, N_If_Expression
,
15850 N_Quantified_Expression
)
15853 Par
:= Parent
(Par
);
15855 -- If the context is not an expression, or if is the result of
15856 -- expansion of an enclosing construct (such as another attribute)
15857 -- the predicate does not apply.
15859 if Nkind
(Par
) = N_Case_Expression_Alternative
then
15862 elsif Nkind
(Par
) not in N_Subexpr
15863 or else not Comes_From_Source
(Par
)
15869 if Nkind
(Par
) = N_If_Expression
then
15870 return Is_Elsif
(Par
) or else Expr
/= First
(Expressions
(Par
));
15872 elsif Nkind
(Par
) = N_Case_Expression
then
15873 return Expr
/= Expression
(Par
);
15875 elsif Nkind_In
(Par
, N_And_Then
, N_Or_Else
) then
15876 return Expr
= Right_Opnd
(Par
);
15878 elsif Nkind_In
(Par
, N_In
, N_Not_In
) then
15880 -- If the membership includes several alternatives, only the first is
15881 -- definitely evaluated.
15883 if Present
(Alternatives
(Par
)) then
15884 return Expr
/= First
(Alternatives
(Par
));
15886 -- If this is a range membership both bounds are evaluated
15892 elsif Nkind
(Par
) = N_Quantified_Expression
then
15893 return Expr
= Condition
(Par
);
15898 end Is_Potentially_Unevaluated
;
15900 --------------------------------
15901 -- Is_Preelaborable_Aggregate --
15902 --------------------------------
15904 function Is_Preelaborable_Aggregate
(Aggr
: Node_Id
) return Boolean is
15905 Aggr_Typ
: constant Entity_Id
:= Etype
(Aggr
);
15906 Array_Aggr
: constant Boolean := Is_Array_Type
(Aggr_Typ
);
15908 Anc_Part
: Node_Id
;
15911 Comp_Typ
: Entity_Id
:= Empty
; -- init to avoid warning
15916 Comp_Typ
:= Component_Type
(Aggr_Typ
);
15919 -- Inspect the ancestor part
15921 if Nkind
(Aggr
) = N_Extension_Aggregate
then
15922 Anc_Part
:= Ancestor_Part
(Aggr
);
15924 -- The ancestor denotes a subtype mark
15926 if Is_Entity_Name
(Anc_Part
)
15927 and then Is_Type
(Entity
(Anc_Part
))
15929 if not Has_Preelaborable_Initialization
(Entity
(Anc_Part
)) then
15933 -- Otherwise the ancestor denotes an expression
15935 elsif not Is_Preelaborable_Construct
(Anc_Part
) then
15940 -- Inspect the positional associations
15942 Expr
:= First
(Expressions
(Aggr
));
15943 while Present
(Expr
) loop
15944 if not Is_Preelaborable_Construct
(Expr
) then
15951 -- Inspect the named associations
15953 Assoc
:= First
(Component_Associations
(Aggr
));
15954 while Present
(Assoc
) loop
15956 -- Inspect the choices of the current named association
15958 Choice
:= First
(Choices
(Assoc
));
15959 while Present
(Choice
) loop
15962 -- For a choice to be preelaborable, it must denote either a
15963 -- static range or a static expression.
15965 if Nkind
(Choice
) = N_Others_Choice
then
15968 elsif Nkind
(Choice
) = N_Range
then
15969 if not Is_OK_Static_Range
(Choice
) then
15973 elsif not Is_OK_Static_Expression
(Choice
) then
15978 Comp_Typ
:= Etype
(Choice
);
15984 -- The type of the choice must have preelaborable initialization if
15985 -- the association carries a <>.
15987 pragma Assert
(Present
(Comp_Typ
));
15988 if Box_Present
(Assoc
) then
15989 if not Has_Preelaborable_Initialization
(Comp_Typ
) then
15993 -- The type of the expression must have preelaborable initialization
15995 elsif not Is_Preelaborable_Construct
(Expression
(Assoc
)) then
16002 -- At this point the aggregate is preelaborable
16005 end Is_Preelaborable_Aggregate
;
16007 --------------------------------
16008 -- Is_Preelaborable_Construct --
16009 --------------------------------
16011 function Is_Preelaborable_Construct
(N
: Node_Id
) return Boolean is
16015 if Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
16016 return Is_Preelaborable_Aggregate
(N
);
16018 -- Attributes are allowed in general, even if their prefix is a formal
16019 -- type. It seems that certain attributes known not to be static might
16020 -- not be allowed, but there are no rules to prevent them.
16022 elsif Nkind
(N
) = N_Attribute_Reference
then
16027 elsif Nkind
(N
) in N_Subexpr
and then Is_OK_Static_Expression
(N
) then
16030 elsif Nkind
(N
) = N_Qualified_Expression
then
16031 return Is_Preelaborable_Construct
(Expression
(N
));
16033 -- Names are preelaborable when they denote a discriminant of an
16034 -- enclosing type. Discriminals are also considered for this check.
16036 elsif Is_Entity_Name
(N
)
16037 and then Present
(Entity
(N
))
16039 (Ekind
(Entity
(N
)) = E_Discriminant
16040 or else (Ekind_In
(Entity
(N
), E_Constant
, E_In_Parameter
)
16041 and then Present
(Discriminal_Link
(Entity
(N
)))))
16047 elsif Nkind
(N
) = N_Null
then
16050 -- Otherwise the construct is not preelaborable
16055 end Is_Preelaborable_Construct
;
16057 ---------------------------------
16058 -- Is_Protected_Self_Reference --
16059 ---------------------------------
16061 function Is_Protected_Self_Reference
(N
: Node_Id
) return Boolean is
16063 function In_Access_Definition
(N
: Node_Id
) return Boolean;
16064 -- Returns true if N belongs to an access definition
16066 --------------------------
16067 -- In_Access_Definition --
16068 --------------------------
16070 function In_Access_Definition
(N
: Node_Id
) return Boolean is
16075 while Present
(P
) loop
16076 if Nkind
(P
) = N_Access_Definition
then
16084 end In_Access_Definition
;
16086 -- Start of processing for Is_Protected_Self_Reference
16089 -- Verify that prefix is analyzed and has the proper form. Note that
16090 -- the attributes Elab_Spec, Elab_Body, and Elab_Subp_Body, which also
16091 -- produce the address of an entity, do not analyze their prefix
16092 -- because they denote entities that are not necessarily visible.
16093 -- Neither of them can apply to a protected type.
16095 return Ada_Version
>= Ada_2005
16096 and then Is_Entity_Name
(N
)
16097 and then Present
(Entity
(N
))
16098 and then Is_Protected_Type
(Entity
(N
))
16099 and then In_Open_Scopes
(Entity
(N
))
16100 and then not In_Access_Definition
(N
);
16101 end Is_Protected_Self_Reference
;
16103 -----------------------------
16104 -- Is_RCI_Pkg_Spec_Or_Body --
16105 -----------------------------
16107 function Is_RCI_Pkg_Spec_Or_Body
(Cunit
: Node_Id
) return Boolean is
16109 function Is_RCI_Pkg_Decl_Cunit
(Cunit
: Node_Id
) return Boolean;
16110 -- Return True if the unit of Cunit is an RCI package declaration
16112 ---------------------------
16113 -- Is_RCI_Pkg_Decl_Cunit --
16114 ---------------------------
16116 function Is_RCI_Pkg_Decl_Cunit
(Cunit
: Node_Id
) return Boolean is
16117 The_Unit
: constant Node_Id
:= Unit
(Cunit
);
16120 if Nkind
(The_Unit
) /= N_Package_Declaration
then
16124 return Is_Remote_Call_Interface
(Defining_Entity
(The_Unit
));
16125 end Is_RCI_Pkg_Decl_Cunit
;
16127 -- Start of processing for Is_RCI_Pkg_Spec_Or_Body
16130 return Is_RCI_Pkg_Decl_Cunit
(Cunit
)
16132 (Nkind
(Unit
(Cunit
)) = N_Package_Body
16133 and then Is_RCI_Pkg_Decl_Cunit
(Library_Unit
(Cunit
)));
16134 end Is_RCI_Pkg_Spec_Or_Body
;
16136 -----------------------------------------
16137 -- Is_Remote_Access_To_Class_Wide_Type --
16138 -----------------------------------------
16140 function Is_Remote_Access_To_Class_Wide_Type
16141 (E
: Entity_Id
) return Boolean
16144 -- A remote access to class-wide type is a general access to object type
16145 -- declared in the visible part of a Remote_Types or Remote_Call_
16148 return Ekind
(E
) = E_General_Access_Type
16149 and then (Is_Remote_Call_Interface
(E
) or else Is_Remote_Types
(E
));
16150 end Is_Remote_Access_To_Class_Wide_Type
;
16152 -----------------------------------------
16153 -- Is_Remote_Access_To_Subprogram_Type --
16154 -----------------------------------------
16156 function Is_Remote_Access_To_Subprogram_Type
16157 (E
: Entity_Id
) return Boolean
16160 return (Ekind
(E
) = E_Access_Subprogram_Type
16161 or else (Ekind
(E
) = E_Record_Type
16162 and then Present
(Corresponding_Remote_Type
(E
))))
16163 and then (Is_Remote_Call_Interface
(E
) or else Is_Remote_Types
(E
));
16164 end Is_Remote_Access_To_Subprogram_Type
;
16166 --------------------
16167 -- Is_Remote_Call --
16168 --------------------
16170 function Is_Remote_Call
(N
: Node_Id
) return Boolean is
16172 if Nkind
(N
) not in N_Subprogram_Call
then
16174 -- An entry call cannot be remote
16178 elsif Nkind
(Name
(N
)) in N_Has_Entity
16179 and then Is_Remote_Call_Interface
(Entity
(Name
(N
)))
16181 -- A subprogram declared in the spec of a RCI package is remote
16185 elsif Nkind
(Name
(N
)) = N_Explicit_Dereference
16186 and then Is_Remote_Access_To_Subprogram_Type
16187 (Etype
(Prefix
(Name
(N
))))
16189 -- The dereference of a RAS is a remote call
16193 elsif Present
(Controlling_Argument
(N
))
16194 and then Is_Remote_Access_To_Class_Wide_Type
16195 (Etype
(Controlling_Argument
(N
)))
16197 -- Any primitive operation call with a controlling argument of
16198 -- a RACW type is a remote call.
16203 -- All other calls are local calls
16206 end Is_Remote_Call
;
16208 ----------------------
16209 -- Is_Renamed_Entry --
16210 ----------------------
16212 function Is_Renamed_Entry
(Proc_Nam
: Entity_Id
) return Boolean is
16213 Orig_Node
: Node_Id
:= Empty
;
16214 Subp_Decl
: Node_Id
:= Parent
(Parent
(Proc_Nam
));
16216 function Is_Entry
(Nam
: Node_Id
) return Boolean;
16217 -- Determine whether Nam is an entry. Traverse selectors if there are
16218 -- nested selected components.
16224 function Is_Entry
(Nam
: Node_Id
) return Boolean is
16226 if Nkind
(Nam
) = N_Selected_Component
then
16227 return Is_Entry
(Selector_Name
(Nam
));
16230 return Ekind
(Entity
(Nam
)) = E_Entry
;
16233 -- Start of processing for Is_Renamed_Entry
16236 if Present
(Alias
(Proc_Nam
)) then
16237 Subp_Decl
:= Parent
(Parent
(Alias
(Proc_Nam
)));
16240 -- Look for a rewritten subprogram renaming declaration
16242 if Nkind
(Subp_Decl
) = N_Subprogram_Declaration
16243 and then Present
(Original_Node
(Subp_Decl
))
16245 Orig_Node
:= Original_Node
(Subp_Decl
);
16248 -- The rewritten subprogram is actually an entry
16250 if Present
(Orig_Node
)
16251 and then Nkind
(Orig_Node
) = N_Subprogram_Renaming_Declaration
16252 and then Is_Entry
(Name
(Orig_Node
))
16258 end Is_Renamed_Entry
;
16260 -----------------------------
16261 -- Is_Renaming_Declaration --
16262 -----------------------------
16264 function Is_Renaming_Declaration
(N
: Node_Id
) return Boolean is
16267 when N_Exception_Renaming_Declaration
16268 | N_Generic_Function_Renaming_Declaration
16269 | N_Generic_Package_Renaming_Declaration
16270 | N_Generic_Procedure_Renaming_Declaration
16271 | N_Object_Renaming_Declaration
16272 | N_Package_Renaming_Declaration
16273 | N_Subprogram_Renaming_Declaration
16280 end Is_Renaming_Declaration
;
16282 ----------------------------
16283 -- Is_Reversible_Iterator --
16284 ----------------------------
16286 function Is_Reversible_Iterator
(Typ
: Entity_Id
) return Boolean is
16287 Ifaces_List
: Elist_Id
;
16288 Iface_Elmt
: Elmt_Id
;
16292 if Is_Class_Wide_Type
(Typ
)
16293 and then Chars
(Root_Type
(Typ
)) = Name_Reversible_Iterator
16294 and then In_Predefined_Unit
(Root_Type
(Typ
))
16298 elsif not Is_Tagged_Type
(Typ
) or else not Is_Derived_Type
(Typ
) then
16302 Collect_Interfaces
(Typ
, Ifaces_List
);
16304 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
16305 while Present
(Iface_Elmt
) loop
16306 Iface
:= Node
(Iface_Elmt
);
16307 if Chars
(Iface
) = Name_Reversible_Iterator
16308 and then In_Predefined_Unit
(Iface
)
16313 Next_Elmt
(Iface_Elmt
);
16318 end Is_Reversible_Iterator
;
16320 ----------------------
16321 -- Is_Selector_Name --
16322 ----------------------
16324 function Is_Selector_Name
(N
: Node_Id
) return Boolean is
16326 if not Is_List_Member
(N
) then
16328 P
: constant Node_Id
:= Parent
(N
);
16330 return Nkind_In
(P
, N_Expanded_Name
,
16331 N_Generic_Association
,
16332 N_Parameter_Association
,
16333 N_Selected_Component
)
16334 and then Selector_Name
(P
) = N
;
16339 L
: constant List_Id
:= List_Containing
(N
);
16340 P
: constant Node_Id
:= Parent
(L
);
16342 return (Nkind
(P
) = N_Discriminant_Association
16343 and then Selector_Names
(P
) = L
)
16345 (Nkind
(P
) = N_Component_Association
16346 and then Choices
(P
) = L
);
16349 end Is_Selector_Name
;
16351 ---------------------------------
16352 -- Is_Single_Concurrent_Object --
16353 ---------------------------------
16355 function Is_Single_Concurrent_Object
(Id
: Entity_Id
) return Boolean is
16358 Is_Single_Protected_Object
(Id
) or else Is_Single_Task_Object
(Id
);
16359 end Is_Single_Concurrent_Object
;
16361 -------------------------------
16362 -- Is_Single_Concurrent_Type --
16363 -------------------------------
16365 function Is_Single_Concurrent_Type
(Id
: Entity_Id
) return Boolean is
16368 Ekind_In
(Id
, E_Protected_Type
, E_Task_Type
)
16369 and then Is_Single_Concurrent_Type_Declaration
16370 (Declaration_Node
(Id
));
16371 end Is_Single_Concurrent_Type
;
16373 -------------------------------------------
16374 -- Is_Single_Concurrent_Type_Declaration --
16375 -------------------------------------------
16377 function Is_Single_Concurrent_Type_Declaration
16378 (N
: Node_Id
) return Boolean
16381 return Nkind_In
(Original_Node
(N
), N_Single_Protected_Declaration
,
16382 N_Single_Task_Declaration
);
16383 end Is_Single_Concurrent_Type_Declaration
;
16385 ---------------------------------------------
16386 -- Is_Single_Precision_Floating_Point_Type --
16387 ---------------------------------------------
16389 function Is_Single_Precision_Floating_Point_Type
16390 (E
: Entity_Id
) return Boolean is
16392 return Is_Floating_Point_Type
(E
)
16393 and then Machine_Radix_Value
(E
) = Uint_2
16394 and then Machine_Mantissa_Value
(E
) = Uint_24
16395 and then Machine_Emax_Value
(E
) = Uint_2
** Uint_7
16396 and then Machine_Emin_Value
(E
) = Uint_3
- (Uint_2
** Uint_7
);
16397 end Is_Single_Precision_Floating_Point_Type
;
16399 --------------------------------
16400 -- Is_Single_Protected_Object --
16401 --------------------------------
16403 function Is_Single_Protected_Object
(Id
: Entity_Id
) return Boolean is
16406 Ekind
(Id
) = E_Variable
16407 and then Ekind
(Etype
(Id
)) = E_Protected_Type
16408 and then Is_Single_Concurrent_Type
(Etype
(Id
));
16409 end Is_Single_Protected_Object
;
16411 ---------------------------
16412 -- Is_Single_Task_Object --
16413 ---------------------------
16415 function Is_Single_Task_Object
(Id
: Entity_Id
) return Boolean is
16418 Ekind
(Id
) = E_Variable
16419 and then Ekind
(Etype
(Id
)) = E_Task_Type
16420 and then Is_Single_Concurrent_Type
(Etype
(Id
));
16421 end Is_Single_Task_Object
;
16423 -------------------------------------
16424 -- Is_SPARK_05_Initialization_Expr --
16425 -------------------------------------
16427 function Is_SPARK_05_Initialization_Expr
(N
: Node_Id
) return Boolean is
16430 Comp_Assn
: Node_Id
;
16431 Orig_N
: constant Node_Id
:= Original_Node
(N
);
16436 if not Comes_From_Source
(Orig_N
) then
16440 pragma Assert
(Nkind
(Orig_N
) in N_Subexpr
);
16442 case Nkind
(Orig_N
) is
16443 when N_Character_Literal
16444 | N_Integer_Literal
16450 when N_Expanded_Name
16453 if Is_Entity_Name
(Orig_N
)
16454 and then Present
(Entity
(Orig_N
)) -- needed in some cases
16456 case Ekind
(Entity
(Orig_N
)) is
16458 | E_Enumeration_Literal
16465 if Is_Type
(Entity
(Orig_N
)) then
16473 when N_Qualified_Expression
16474 | N_Type_Conversion
16476 Is_Ok
:= Is_SPARK_05_Initialization_Expr
(Expression
(Orig_N
));
16479 Is_Ok
:= Is_SPARK_05_Initialization_Expr
(Right_Opnd
(Orig_N
));
16482 | N_Membership_Test
16485 Is_Ok
:= Is_SPARK_05_Initialization_Expr
(Left_Opnd
(Orig_N
))
16487 Is_SPARK_05_Initialization_Expr
(Right_Opnd
(Orig_N
));
16490 | N_Extension_Aggregate
16492 if Nkind
(Orig_N
) = N_Extension_Aggregate
then
16494 Is_SPARK_05_Initialization_Expr
(Ancestor_Part
(Orig_N
));
16497 Expr
:= First
(Expressions
(Orig_N
));
16498 while Present
(Expr
) loop
16499 if not Is_SPARK_05_Initialization_Expr
(Expr
) then
16507 Comp_Assn
:= First
(Component_Associations
(Orig_N
));
16508 while Present
(Comp_Assn
) loop
16509 Expr
:= Expression
(Comp_Assn
);
16511 -- Note: test for Present here needed for box assocation
16514 and then not Is_SPARK_05_Initialization_Expr
(Expr
)
16523 when N_Attribute_Reference
=>
16524 if Nkind
(Prefix
(Orig_N
)) in N_Subexpr
then
16525 Is_Ok
:= Is_SPARK_05_Initialization_Expr
(Prefix
(Orig_N
));
16528 Expr
:= First
(Expressions
(Orig_N
));
16529 while Present
(Expr
) loop
16530 if not Is_SPARK_05_Initialization_Expr
(Expr
) then
16538 -- Selected components might be expanded named not yet resolved, so
16539 -- default on the safe side. (Eg on sparklex.ads)
16541 when N_Selected_Component
=>
16550 end Is_SPARK_05_Initialization_Expr
;
16552 ----------------------------------
16553 -- Is_SPARK_05_Object_Reference --
16554 ----------------------------------
16556 function Is_SPARK_05_Object_Reference
(N
: Node_Id
) return Boolean is
16558 if Is_Entity_Name
(N
) then
16559 return Present
(Entity
(N
))
16561 (Ekind_In
(Entity
(N
), E_Constant
, E_Variable
)
16562 or else Ekind
(Entity
(N
)) in Formal_Kind
);
16566 when N_Selected_Component
=>
16567 return Is_SPARK_05_Object_Reference
(Prefix
(N
));
16573 end Is_SPARK_05_Object_Reference
;
16575 -----------------------------
16576 -- Is_Specific_Tagged_Type --
16577 -----------------------------
16579 function Is_Specific_Tagged_Type
(Typ
: Entity_Id
) return Boolean is
16580 Full_Typ
: Entity_Id
;
16583 -- Handle private types
16585 if Is_Private_Type
(Typ
) and then Present
(Full_View
(Typ
)) then
16586 Full_Typ
:= Full_View
(Typ
);
16591 -- A specific tagged type is a non-class-wide tagged type
16593 return Is_Tagged_Type
(Full_Typ
) and not Is_Class_Wide_Type
(Full_Typ
);
16594 end Is_Specific_Tagged_Type
;
16600 function Is_Statement
(N
: Node_Id
) return Boolean is
16603 Nkind
(N
) in N_Statement_Other_Than_Procedure_Call
16604 or else Nkind
(N
) = N_Procedure_Call_Statement
;
16607 ---------------------------------------
16608 -- Is_Subprogram_Contract_Annotation --
16609 ---------------------------------------
16611 function Is_Subprogram_Contract_Annotation
16612 (Item
: Node_Id
) return Boolean
16617 if Nkind
(Item
) = N_Aspect_Specification
then
16618 Nam
:= Chars
(Identifier
(Item
));
16620 else pragma Assert
(Nkind
(Item
) = N_Pragma
);
16621 Nam
:= Pragma_Name
(Item
);
16624 return Nam
= Name_Contract_Cases
16625 or else Nam
= Name_Depends
16626 or else Nam
= Name_Extensions_Visible
16627 or else Nam
= Name_Global
16628 or else Nam
= Name_Post
16629 or else Nam
= Name_Post_Class
16630 or else Nam
= Name_Postcondition
16631 or else Nam
= Name_Pre
16632 or else Nam
= Name_Pre_Class
16633 or else Nam
= Name_Precondition
16634 or else Nam
= Name_Refined_Depends
16635 or else Nam
= Name_Refined_Global
16636 or else Nam
= Name_Refined_Post
16637 or else Nam
= Name_Test_Case
;
16638 end Is_Subprogram_Contract_Annotation
;
16640 --------------------------------------------------
16641 -- Is_Subprogram_Stub_Without_Prior_Declaration --
16642 --------------------------------------------------
16644 function Is_Subprogram_Stub_Without_Prior_Declaration
16645 (N
: Node_Id
) return Boolean
16648 -- A subprogram stub without prior declaration serves as declaration for
16649 -- the actual subprogram body. As such, it has an attached defining
16650 -- entity of E_[Generic_]Function or E_[Generic_]Procedure.
16652 return Nkind
(N
) = N_Subprogram_Body_Stub
16653 and then Ekind
(Defining_Entity
(N
)) /= E_Subprogram_Body
;
16654 end Is_Subprogram_Stub_Without_Prior_Declaration
;
16656 --------------------------
16657 -- Is_Suspension_Object --
16658 --------------------------
16660 function Is_Suspension_Object
(Id
: Entity_Id
) return Boolean is
16662 -- This approach does an exact name match rather than to rely on
16663 -- RTSfind. Routine Is_Effectively_Volatile is used by clients of the
16664 -- front end at point where all auxiliary tables are locked and any
16665 -- modifications to them are treated as violations. Do not tamper with
16666 -- the tables, instead examine the Chars fields of all the scopes of Id.
16669 Chars
(Id
) = Name_Suspension_Object
16670 and then Present
(Scope
(Id
))
16671 and then Chars
(Scope
(Id
)) = Name_Synchronous_Task_Control
16672 and then Present
(Scope
(Scope
(Id
)))
16673 and then Chars
(Scope
(Scope
(Id
))) = Name_Ada
16674 and then Present
(Scope
(Scope
(Scope
(Id
))))
16675 and then Scope
(Scope
(Scope
(Id
))) = Standard_Standard
;
16676 end Is_Suspension_Object
;
16678 ----------------------------
16679 -- Is_Synchronized_Object --
16680 ----------------------------
16682 function Is_Synchronized_Object
(Id
: Entity_Id
) return Boolean is
16686 if Is_Object
(Id
) then
16688 -- The object is synchronized if it is of a type that yields a
16689 -- synchronized object.
16691 if Yields_Synchronized_Object
(Etype
(Id
)) then
16694 -- The object is synchronized if it is atomic and Async_Writers is
16697 elsif Is_Atomic
(Id
) and then Async_Writers_Enabled
(Id
) then
16700 -- A constant is a synchronized object by default
16702 elsif Ekind
(Id
) = E_Constant
then
16705 -- A variable is a synchronized object if it is subject to pragma
16706 -- Constant_After_Elaboration.
16708 elsif Ekind
(Id
) = E_Variable
then
16709 Prag
:= Get_Pragma
(Id
, Pragma_Constant_After_Elaboration
);
16711 return Present
(Prag
) and then Is_Enabled_Pragma
(Prag
);
16715 -- Otherwise the input is not an object or it does not qualify as a
16716 -- synchronized object.
16719 end Is_Synchronized_Object
;
16721 ---------------------------------
16722 -- Is_Synchronized_Tagged_Type --
16723 ---------------------------------
16725 function Is_Synchronized_Tagged_Type
(E
: Entity_Id
) return Boolean is
16726 Kind
: constant Entity_Kind
:= Ekind
(Base_Type
(E
));
16729 -- A task or protected type derived from an interface is a tagged type.
16730 -- Such a tagged type is called a synchronized tagged type, as are
16731 -- synchronized interfaces and private extensions whose declaration
16732 -- includes the reserved word synchronized.
16734 return (Is_Tagged_Type
(E
)
16735 and then (Kind
= E_Task_Type
16737 Kind
= E_Protected_Type
))
16740 and then Is_Synchronized_Interface
(E
))
16742 (Ekind
(E
) = E_Record_Type_With_Private
16743 and then Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
16744 and then (Synchronized_Present
(Parent
(E
))
16745 or else Is_Synchronized_Interface
(Etype
(E
))));
16746 end Is_Synchronized_Tagged_Type
;
16752 function Is_Transfer
(N
: Node_Id
) return Boolean is
16753 Kind
: constant Node_Kind
:= Nkind
(N
);
16756 if Kind
= N_Simple_Return_Statement
16758 Kind
= N_Extended_Return_Statement
16760 Kind
= N_Goto_Statement
16762 Kind
= N_Raise_Statement
16764 Kind
= N_Requeue_Statement
16768 elsif (Kind
= N_Exit_Statement
or else Kind
in N_Raise_xxx_Error
)
16769 and then No
(Condition
(N
))
16773 elsif Kind
= N_Procedure_Call_Statement
16774 and then Is_Entity_Name
(Name
(N
))
16775 and then Present
(Entity
(Name
(N
)))
16776 and then No_Return
(Entity
(Name
(N
)))
16780 elsif Nkind
(Original_Node
(N
)) = N_Raise_Statement
then
16792 function Is_True
(U
: Uint
) return Boolean is
16797 --------------------------------------
16798 -- Is_Unchecked_Conversion_Instance --
16799 --------------------------------------
16801 function Is_Unchecked_Conversion_Instance
(Id
: Entity_Id
) return Boolean is
16805 -- Look for a function whose generic parent is the predefined intrinsic
16806 -- function Unchecked_Conversion, or for one that renames such an
16809 if Ekind
(Id
) = E_Function
then
16810 Par
:= Parent
(Id
);
16812 if Nkind
(Par
) = N_Function_Specification
then
16813 Par
:= Generic_Parent
(Par
);
16815 if Present
(Par
) then
16817 Chars
(Par
) = Name_Unchecked_Conversion
16818 and then Is_Intrinsic_Subprogram
(Par
)
16819 and then In_Predefined_Unit
(Par
);
16822 Present
(Alias
(Id
))
16823 and then Is_Unchecked_Conversion_Instance
(Alias
(Id
));
16829 end Is_Unchecked_Conversion_Instance
;
16831 -------------------------------
16832 -- Is_Universal_Numeric_Type --
16833 -------------------------------
16835 function Is_Universal_Numeric_Type
(T
: Entity_Id
) return Boolean is
16837 return T
= Universal_Integer
or else T
= Universal_Real
;
16838 end Is_Universal_Numeric_Type
;
16840 ------------------------------
16841 -- Is_User_Defined_Equality --
16842 ------------------------------
16844 function Is_User_Defined_Equality
(Id
: Entity_Id
) return Boolean is
16846 return Ekind
(Id
) = E_Function
16847 and then Chars
(Id
) = Name_Op_Eq
16848 and then Comes_From_Source
(Id
)
16850 -- Internally generated equalities have a full type declaration
16851 -- as their parent.
16853 and then Nkind
(Parent
(Id
)) = N_Function_Specification
;
16854 end Is_User_Defined_Equality
;
16856 --------------------------------------
16857 -- Is_Validation_Variable_Reference --
16858 --------------------------------------
16860 function Is_Validation_Variable_Reference
(N
: Node_Id
) return Boolean is
16861 Var
: constant Node_Id
:= Unqual_Conv
(N
);
16862 Var_Id
: Entity_Id
;
16867 if Is_Entity_Name
(Var
) then
16868 Var_Id
:= Entity
(Var
);
16873 and then Ekind
(Var_Id
) = E_Variable
16874 and then Present
(Validated_Object
(Var_Id
));
16875 end Is_Validation_Variable_Reference
;
16877 ----------------------------
16878 -- Is_Variable_Size_Array --
16879 ----------------------------
16881 function Is_Variable_Size_Array
(E
: Entity_Id
) return Boolean is
16885 pragma Assert
(Is_Array_Type
(E
));
16887 -- Check if some index is initialized with a non-constant value
16889 Idx
:= First_Index
(E
);
16890 while Present
(Idx
) loop
16891 if Nkind
(Idx
) = N_Range
then
16892 if not Is_Constant_Bound
(Low_Bound
(Idx
))
16893 or else not Is_Constant_Bound
(High_Bound
(Idx
))
16899 Idx
:= Next_Index
(Idx
);
16903 end Is_Variable_Size_Array
;
16905 -----------------------------
16906 -- Is_Variable_Size_Record --
16907 -----------------------------
16909 function Is_Variable_Size_Record
(E
: Entity_Id
) return Boolean is
16911 Comp_Typ
: Entity_Id
;
16914 pragma Assert
(Is_Record_Type
(E
));
16916 Comp
:= First_Entity
(E
);
16917 while Present
(Comp
) loop
16918 Comp_Typ
:= Etype
(Comp
);
16920 -- Recursive call if the record type has discriminants
16922 if Is_Record_Type
(Comp_Typ
)
16923 and then Has_Discriminants
(Comp_Typ
)
16924 and then Is_Variable_Size_Record
(Comp_Typ
)
16928 elsif Is_Array_Type
(Comp_Typ
)
16929 and then Is_Variable_Size_Array
(Comp_Typ
)
16934 Next_Entity
(Comp
);
16938 end Is_Variable_Size_Record
;
16944 function Is_Variable
16946 Use_Original_Node
: Boolean := True) return Boolean
16948 Orig_Node
: Node_Id
;
16950 function In_Protected_Function
(E
: Entity_Id
) return Boolean;
16951 -- Within a protected function, the private components of the enclosing
16952 -- protected type are constants. A function nested within a (protected)
16953 -- procedure is not itself protected. Within the body of a protected
16954 -- function the current instance of the protected type is a constant.
16956 function Is_Variable_Prefix
(P
: Node_Id
) return Boolean;
16957 -- Prefixes can involve implicit dereferences, in which case we must
16958 -- test for the case of a reference of a constant access type, which can
16959 -- can never be a variable.
16961 ---------------------------
16962 -- In_Protected_Function --
16963 ---------------------------
16965 function In_Protected_Function
(E
: Entity_Id
) return Boolean is
16970 -- E is the current instance of a type
16972 if Is_Type
(E
) then
16981 if not Is_Protected_Type
(Prot
) then
16985 S
:= Current_Scope
;
16986 while Present
(S
) and then S
/= Prot
loop
16987 if Ekind
(S
) = E_Function
and then Scope
(S
) = Prot
then
16996 end In_Protected_Function
;
16998 ------------------------
16999 -- Is_Variable_Prefix --
17000 ------------------------
17002 function Is_Variable_Prefix
(P
: Node_Id
) return Boolean is
17004 if Is_Access_Type
(Etype
(P
)) then
17005 return not Is_Access_Constant
(Root_Type
(Etype
(P
)));
17007 -- For the case of an indexed component whose prefix has a packed
17008 -- array type, the prefix has been rewritten into a type conversion.
17009 -- Determine variable-ness from the converted expression.
17011 elsif Nkind
(P
) = N_Type_Conversion
17012 and then not Comes_From_Source
(P
)
17013 and then Is_Array_Type
(Etype
(P
))
17014 and then Is_Packed
(Etype
(P
))
17016 return Is_Variable
(Expression
(P
));
17019 return Is_Variable
(P
);
17021 end Is_Variable_Prefix
;
17023 -- Start of processing for Is_Variable
17026 -- Special check, allow x'Deref(expr) as a variable
17028 if Nkind
(N
) = N_Attribute_Reference
17029 and then Attribute_Name
(N
) = Name_Deref
17034 -- Check if we perform the test on the original node since this may be a
17035 -- test of syntactic categories which must not be disturbed by whatever
17036 -- rewriting might have occurred. For example, an aggregate, which is
17037 -- certainly NOT a variable, could be turned into a variable by
17040 if Use_Original_Node
then
17041 Orig_Node
:= Original_Node
(N
);
17046 -- Definitely OK if Assignment_OK is set. Since this is something that
17047 -- only gets set for expanded nodes, the test is on N, not Orig_Node.
17049 if Nkind
(N
) in N_Subexpr
and then Assignment_OK
(N
) then
17052 -- Normally we go to the original node, but there is one exception where
17053 -- we use the rewritten node, namely when it is an explicit dereference.
17054 -- The generated code may rewrite a prefix which is an access type with
17055 -- an explicit dereference. The dereference is a variable, even though
17056 -- the original node may not be (since it could be a constant of the
17059 -- In Ada 2005 we have a further case to consider: the prefix may be a
17060 -- function call given in prefix notation. The original node appears to
17061 -- be a selected component, but we need to examine the call.
17063 elsif Nkind
(N
) = N_Explicit_Dereference
17064 and then Nkind
(Orig_Node
) /= N_Explicit_Dereference
17065 and then Present
(Etype
(Orig_Node
))
17066 and then Is_Access_Type
(Etype
(Orig_Node
))
17068 -- Note that if the prefix is an explicit dereference that does not
17069 -- come from source, we must check for a rewritten function call in
17070 -- prefixed notation before other forms of rewriting, to prevent a
17074 (Nkind
(Orig_Node
) = N_Function_Call
17075 and then not Is_Access_Constant
(Etype
(Prefix
(N
))))
17077 Is_Variable_Prefix
(Original_Node
(Prefix
(N
)));
17079 -- in Ada 2012, the dereference may have been added for a type with
17080 -- a declared implicit dereference aspect. Check that it is not an
17081 -- access to constant.
17083 elsif Nkind
(N
) = N_Explicit_Dereference
17084 and then Present
(Etype
(Orig_Node
))
17085 and then Ada_Version
>= Ada_2012
17086 and then Has_Implicit_Dereference
(Etype
(Orig_Node
))
17088 return not Is_Access_Constant
(Etype
(Prefix
(N
)));
17090 -- A function call is never a variable
17092 elsif Nkind
(N
) = N_Function_Call
then
17095 -- All remaining checks use the original node
17097 elsif Is_Entity_Name
(Orig_Node
)
17098 and then Present
(Entity
(Orig_Node
))
17101 E
: constant Entity_Id
:= Entity
(Orig_Node
);
17102 K
: constant Entity_Kind
:= Ekind
(E
);
17105 return (K
= E_Variable
17106 and then Nkind
(Parent
(E
)) /= N_Exception_Handler
)
17107 or else (K
= E_Component
17108 and then not In_Protected_Function
(E
))
17109 or else K
= E_Out_Parameter
17110 or else K
= E_In_Out_Parameter
17111 or else K
= E_Generic_In_Out_Parameter
17113 -- Current instance of type. If this is a protected type, check
17114 -- we are not within the body of one of its protected functions.
17116 or else (Is_Type
(E
)
17117 and then In_Open_Scopes
(E
)
17118 and then not In_Protected_Function
(E
))
17120 or else (Is_Incomplete_Or_Private_Type
(E
)
17121 and then In_Open_Scopes
(Full_View
(E
)));
17125 case Nkind
(Orig_Node
) is
17126 when N_Indexed_Component
17129 return Is_Variable_Prefix
(Prefix
(Orig_Node
));
17131 when N_Selected_Component
=>
17132 return (Is_Variable
(Selector_Name
(Orig_Node
))
17133 and then Is_Variable_Prefix
(Prefix
(Orig_Node
)))
17135 (Nkind
(N
) = N_Expanded_Name
17136 and then Scope
(Entity
(N
)) = Entity
(Prefix
(N
)));
17138 -- For an explicit dereference, the type of the prefix cannot
17139 -- be an access to constant or an access to subprogram.
17141 when N_Explicit_Dereference
=>
17143 Typ
: constant Entity_Id
:= Etype
(Prefix
(Orig_Node
));
17145 return Is_Access_Type
(Typ
)
17146 and then not Is_Access_Constant
(Root_Type
(Typ
))
17147 and then Ekind
(Typ
) /= E_Access_Subprogram_Type
;
17150 -- The type conversion is the case where we do not deal with the
17151 -- context dependent special case of an actual parameter. Thus
17152 -- the type conversion is only considered a variable for the
17153 -- purposes of this routine if the target type is tagged. However,
17154 -- a type conversion is considered to be a variable if it does not
17155 -- come from source (this deals for example with the conversions
17156 -- of expressions to their actual subtypes).
17158 when N_Type_Conversion
=>
17159 return Is_Variable
(Expression
(Orig_Node
))
17161 (not Comes_From_Source
(Orig_Node
)
17163 (Is_Tagged_Type
(Etype
(Subtype_Mark
(Orig_Node
)))
17165 Is_Tagged_Type
(Etype
(Expression
(Orig_Node
)))));
17167 -- GNAT allows an unchecked type conversion as a variable. This
17168 -- only affects the generation of internal expanded code, since
17169 -- calls to instantiations of Unchecked_Conversion are never
17170 -- considered variables (since they are function calls).
17172 when N_Unchecked_Type_Conversion
=>
17173 return Is_Variable
(Expression
(Orig_Node
));
17181 ---------------------------
17182 -- Is_Visibly_Controlled --
17183 ---------------------------
17185 function Is_Visibly_Controlled
(T
: Entity_Id
) return Boolean is
17186 Root
: constant Entity_Id
:= Root_Type
(T
);
17188 return Chars
(Scope
(Root
)) = Name_Finalization
17189 and then Chars
(Scope
(Scope
(Root
))) = Name_Ada
17190 and then Scope
(Scope
(Scope
(Root
))) = Standard_Standard
;
17191 end Is_Visibly_Controlled
;
17193 --------------------------
17194 -- Is_Volatile_Function --
17195 --------------------------
17197 function Is_Volatile_Function
(Func_Id
: Entity_Id
) return Boolean is
17199 pragma Assert
(Ekind_In
(Func_Id
, E_Function
, E_Generic_Function
));
17201 -- A function declared within a protected type is volatile
17203 if Is_Protected_Type
(Scope
(Func_Id
)) then
17206 -- An instance of Ada.Unchecked_Conversion is a volatile function if
17207 -- either the source or the target are effectively volatile.
17209 elsif Is_Unchecked_Conversion_Instance
(Func_Id
)
17210 and then Has_Effectively_Volatile_Profile
(Func_Id
)
17214 -- Otherwise the function is treated as volatile if it is subject to
17215 -- enabled pragma Volatile_Function.
17219 Is_Enabled_Pragma
(Get_Pragma
(Func_Id
, Pragma_Volatile_Function
));
17221 end Is_Volatile_Function
;
17223 ------------------------
17224 -- Is_Volatile_Object --
17225 ------------------------
17227 function Is_Volatile_Object
(N
: Node_Id
) return Boolean is
17228 function Is_Volatile_Prefix
(N
: Node_Id
) return Boolean;
17229 -- If prefix is an implicit dereference, examine designated type
17231 function Object_Has_Volatile_Components
(N
: Node_Id
) return Boolean;
17232 -- Determines if given object has volatile components
17234 ------------------------
17235 -- Is_Volatile_Prefix --
17236 ------------------------
17238 function Is_Volatile_Prefix
(N
: Node_Id
) return Boolean is
17239 Typ
: constant Entity_Id
:= Etype
(N
);
17242 if Is_Access_Type
(Typ
) then
17244 Dtyp
: constant Entity_Id
:= Designated_Type
(Typ
);
17247 return Is_Volatile
(Dtyp
)
17248 or else Has_Volatile_Components
(Dtyp
);
17252 return Object_Has_Volatile_Components
(N
);
17254 end Is_Volatile_Prefix
;
17256 ------------------------------------
17257 -- Object_Has_Volatile_Components --
17258 ------------------------------------
17260 function Object_Has_Volatile_Components
(N
: Node_Id
) return Boolean is
17261 Typ
: constant Entity_Id
:= Etype
(N
);
17264 if Is_Volatile
(Typ
)
17265 or else Has_Volatile_Components
(Typ
)
17269 elsif Is_Entity_Name
(N
)
17270 and then (Has_Volatile_Components
(Entity
(N
))
17271 or else Is_Volatile
(Entity
(N
)))
17275 elsif Nkind
(N
) = N_Indexed_Component
17276 or else Nkind
(N
) = N_Selected_Component
17278 return Is_Volatile_Prefix
(Prefix
(N
));
17283 end Object_Has_Volatile_Components
;
17285 -- Start of processing for Is_Volatile_Object
17288 if Nkind
(N
) = N_Defining_Identifier
then
17289 return Is_Volatile
(N
) or else Is_Volatile
(Etype
(N
));
17291 elsif Nkind
(N
) = N_Expanded_Name
then
17292 return Is_Volatile_Object
(Entity
(N
));
17294 elsif Is_Volatile
(Etype
(N
))
17295 or else (Is_Entity_Name
(N
) and then Is_Volatile
(Entity
(N
)))
17299 elsif Nkind_In
(N
, N_Indexed_Component
, N_Selected_Component
)
17300 and then Is_Volatile_Prefix
(Prefix
(N
))
17304 elsif Nkind
(N
) = N_Selected_Component
17305 and then Is_Volatile
(Entity
(Selector_Name
(N
)))
17312 end Is_Volatile_Object
;
17314 -----------------------------
17315 -- Iterate_Call_Parameters --
17316 -----------------------------
17318 procedure Iterate_Call_Parameters
(Call
: Node_Id
) is
17319 Formal
: Entity_Id
:= First_Formal
(Get_Called_Entity
(Call
));
17320 Actual
: Node_Id
:= First_Actual
(Call
);
17323 while Present
(Formal
) and then Present
(Actual
) loop
17324 Handle_Parameter
(Formal
, Actual
);
17325 Formal
:= Next_Formal
(Formal
);
17326 Actual
:= Next_Actual
(Actual
);
17328 end Iterate_Call_Parameters
;
17330 ---------------------------
17331 -- Itype_Has_Declaration --
17332 ---------------------------
17334 function Itype_Has_Declaration
(Id
: Entity_Id
) return Boolean is
17336 pragma Assert
(Is_Itype
(Id
));
17337 return Present
(Parent
(Id
))
17338 and then Nkind_In
(Parent
(Id
), N_Full_Type_Declaration
,
17339 N_Subtype_Declaration
)
17340 and then Defining_Entity
(Parent
(Id
)) = Id
;
17341 end Itype_Has_Declaration
;
17343 -------------------------
17344 -- Kill_Current_Values --
17345 -------------------------
17347 procedure Kill_Current_Values
17349 Last_Assignment_Only
: Boolean := False)
17352 if Is_Assignable
(Ent
) then
17353 Set_Last_Assignment
(Ent
, Empty
);
17356 if Is_Object
(Ent
) then
17357 if not Last_Assignment_Only
then
17359 Set_Current_Value
(Ent
, Empty
);
17361 -- Do not reset the Is_Known_[Non_]Null and Is_Known_Valid flags
17362 -- for a constant. Once the constant is elaborated, its value is
17363 -- not changed, therefore the associated flags that describe the
17364 -- value should not be modified either.
17366 if Ekind
(Ent
) = E_Constant
then
17369 -- Non-constant entities
17372 if not Can_Never_Be_Null
(Ent
) then
17373 Set_Is_Known_Non_Null
(Ent
, False);
17376 Set_Is_Known_Null
(Ent
, False);
17378 -- Reset the Is_Known_Valid flag unless the type is always
17379 -- valid. This does not apply to a loop parameter because its
17380 -- bounds are defined by the loop header and therefore always
17383 if not Is_Known_Valid
(Etype
(Ent
))
17384 and then Ekind
(Ent
) /= E_Loop_Parameter
17386 Set_Is_Known_Valid
(Ent
, False);
17391 end Kill_Current_Values
;
17393 procedure Kill_Current_Values
(Last_Assignment_Only
: Boolean := False) is
17396 procedure Kill_Current_Values_For_Entity_Chain
(E
: Entity_Id
);
17397 -- Clear current value for entity E and all entities chained to E
17399 ------------------------------------------
17400 -- Kill_Current_Values_For_Entity_Chain --
17401 ------------------------------------------
17403 procedure Kill_Current_Values_For_Entity_Chain
(E
: Entity_Id
) is
17407 while Present
(Ent
) loop
17408 Kill_Current_Values
(Ent
, Last_Assignment_Only
);
17411 end Kill_Current_Values_For_Entity_Chain
;
17413 -- Start of processing for Kill_Current_Values
17416 -- Kill all saved checks, a special case of killing saved values
17418 if not Last_Assignment_Only
then
17422 -- Loop through relevant scopes, which includes the current scope and
17423 -- any parent scopes if the current scope is a block or a package.
17425 S
:= Current_Scope
;
17428 -- Clear current values of all entities in current scope
17430 Kill_Current_Values_For_Entity_Chain
(First_Entity
(S
));
17432 -- If scope is a package, also clear current values of all private
17433 -- entities in the scope.
17435 if Is_Package_Or_Generic_Package
(S
)
17436 or else Is_Concurrent_Type
(S
)
17438 Kill_Current_Values_For_Entity_Chain
(First_Private_Entity
(S
));
17441 -- If this is a not a subprogram, deal with parents
17443 if not Is_Subprogram
(S
) then
17445 exit Scope_Loop
when S
= Standard_Standard
;
17449 end loop Scope_Loop
;
17450 end Kill_Current_Values
;
17452 --------------------------
17453 -- Kill_Size_Check_Code --
17454 --------------------------
17456 procedure Kill_Size_Check_Code
(E
: Entity_Id
) is
17458 if (Ekind
(E
) = E_Constant
or else Ekind
(E
) = E_Variable
)
17459 and then Present
(Size_Check_Code
(E
))
17461 Remove
(Size_Check_Code
(E
));
17462 Set_Size_Check_Code
(E
, Empty
);
17464 end Kill_Size_Check_Code
;
17466 --------------------
17467 -- Known_Non_Null --
17468 --------------------
17470 function Known_Non_Null
(N
: Node_Id
) return Boolean is
17471 Status
: constant Null_Status_Kind
:= Null_Status
(N
);
17478 -- The expression yields a non-null value ignoring simple flow analysis
17480 if Status
= Is_Non_Null
then
17483 -- Otherwise check whether N is a reference to an entity that appears
17484 -- within a conditional construct.
17486 elsif Is_Entity_Name
(N
) and then Present
(Entity
(N
)) then
17488 -- First check if we are in decisive conditional
17490 Get_Current_Value_Condition
(N
, Op
, Val
);
17492 if Known_Null
(Val
) then
17493 if Op
= N_Op_Eq
then
17495 elsif Op
= N_Op_Ne
then
17500 -- If OK to do replacement, test Is_Known_Non_Null flag
17504 if OK_To_Do_Constant_Replacement
(Id
) then
17505 return Is_Known_Non_Null
(Id
);
17509 -- Otherwise it is not possible to determine whether N yields a non-null
17513 end Known_Non_Null
;
17519 function Known_Null
(N
: Node_Id
) return Boolean is
17520 Status
: constant Null_Status_Kind
:= Null_Status
(N
);
17527 -- The expression yields a null value ignoring simple flow analysis
17529 if Status
= Is_Null
then
17532 -- Otherwise check whether N is a reference to an entity that appears
17533 -- within a conditional construct.
17535 elsif Is_Entity_Name
(N
) and then Present
(Entity
(N
)) then
17537 -- First check if we are in decisive conditional
17539 Get_Current_Value_Condition
(N
, Op
, Val
);
17541 if Known_Null
(Val
) then
17542 if Op
= N_Op_Eq
then
17544 elsif Op
= N_Op_Ne
then
17549 -- If OK to do replacement, test Is_Known_Null flag
17553 if OK_To_Do_Constant_Replacement
(Id
) then
17554 return Is_Known_Null
(Id
);
17558 -- Otherwise it is not possible to determine whether N yields a null
17564 --------------------------
17565 -- Known_To_Be_Assigned --
17566 --------------------------
17568 function Known_To_Be_Assigned
(N
: Node_Id
) return Boolean is
17569 P
: constant Node_Id
:= Parent
(N
);
17574 -- Test left side of assignment
17576 when N_Assignment_Statement
=>
17577 return N
= Name
(P
);
17579 -- Function call arguments are never lvalues
17581 when N_Function_Call
=>
17584 -- Positional parameter for procedure or accept call
17586 when N_Accept_Statement
17587 | N_Procedure_Call_Statement
17595 Proc
:= Get_Subprogram_Entity
(P
);
17601 -- If we are not a list member, something is strange, so
17602 -- be conservative and return False.
17604 if not Is_List_Member
(N
) then
17608 -- We are going to find the right formal by stepping forward
17609 -- through the formals, as we step backwards in the actuals.
17611 Form
:= First_Formal
(Proc
);
17614 -- If no formal, something is weird, so be conservative
17615 -- and return False.
17622 exit when No
(Act
);
17623 Next_Formal
(Form
);
17626 return Ekind
(Form
) /= E_In_Parameter
;
17629 -- Named parameter for procedure or accept call
17631 when N_Parameter_Association
=>
17637 Proc
:= Get_Subprogram_Entity
(Parent
(P
));
17643 -- Loop through formals to find the one that matches
17645 Form
:= First_Formal
(Proc
);
17647 -- If no matching formal, that's peculiar, some kind of
17648 -- previous error, so return False to be conservative.
17649 -- Actually this also happens in legal code in the case
17650 -- where P is a parameter association for an Extra_Formal???
17656 -- Else test for match
17658 if Chars
(Form
) = Chars
(Selector_Name
(P
)) then
17659 return Ekind
(Form
) /= E_In_Parameter
;
17662 Next_Formal
(Form
);
17666 -- Test for appearing in a conversion that itself appears
17667 -- in an lvalue context, since this should be an lvalue.
17669 when N_Type_Conversion
=>
17670 return Known_To_Be_Assigned
(P
);
17672 -- All other references are definitely not known to be modifications
17677 end Known_To_Be_Assigned
;
17679 ---------------------------
17680 -- Last_Source_Statement --
17681 ---------------------------
17683 function Last_Source_Statement
(HSS
: Node_Id
) return Node_Id
is
17687 N
:= Last
(Statements
(HSS
));
17688 while Present
(N
) loop
17689 exit when Comes_From_Source
(N
);
17694 end Last_Source_Statement
;
17696 -----------------------
17697 -- Mark_Coextensions --
17698 -----------------------
17700 procedure Mark_Coextensions
(Context_Nod
: Node_Id
; Root_Nod
: Node_Id
) is
17701 Is_Dynamic
: Boolean;
17702 -- Indicates whether the context causes nested coextensions to be
17703 -- dynamic or static
17705 function Mark_Allocator
(N
: Node_Id
) return Traverse_Result
;
17706 -- Recognize an allocator node and label it as a dynamic coextension
17708 --------------------
17709 -- Mark_Allocator --
17710 --------------------
17712 function Mark_Allocator
(N
: Node_Id
) return Traverse_Result
is
17714 if Nkind
(N
) = N_Allocator
then
17716 Set_Is_Dynamic_Coextension
(N
);
17718 -- If the allocator expression is potentially dynamic, it may
17719 -- be expanded out of order and require dynamic allocation
17720 -- anyway, so we treat the coextension itself as dynamic.
17721 -- Potential optimization ???
17723 elsif Nkind
(Expression
(N
)) = N_Qualified_Expression
17724 and then Nkind
(Expression
(Expression
(N
))) = N_Op_Concat
17726 Set_Is_Dynamic_Coextension
(N
);
17728 Set_Is_Static_Coextension
(N
);
17733 end Mark_Allocator
;
17735 procedure Mark_Allocators
is new Traverse_Proc
(Mark_Allocator
);
17737 -- Start of processing for Mark_Coextensions
17740 -- An allocator that appears on the right-hand side of an assignment is
17741 -- treated as a potentially dynamic coextension when the right-hand side
17742 -- is an allocator or a qualified expression.
17744 -- Obj := new ...'(new Coextension ...);
17746 if Nkind
(Context_Nod
) = N_Assignment_Statement
then
17748 Nkind_In
(Expression
(Context_Nod
), N_Allocator
,
17749 N_Qualified_Expression
);
17751 -- An allocator that appears within the expression of a simple return
17752 -- statement is treated as a potentially dynamic coextension when the
17753 -- expression is either aggregate, allocator, or qualified expression.
17755 -- return (new Coextension ...);
17756 -- return new ...'(new Coextension ...);
17758 elsif Nkind
(Context_Nod
) = N_Simple_Return_Statement
then
17760 Nkind_In
(Expression
(Context_Nod
), N_Aggregate
,
17762 N_Qualified_Expression
);
17764 -- An alloctor that appears within the initialization expression of an
17765 -- object declaration is considered a potentially dynamic coextension
17766 -- when the initialization expression is an allocator or a qualified
17769 -- Obj : ... := new ...'(new Coextension ...);
17771 -- A similar case arises when the object declaration is part of an
17772 -- extended return statement.
17774 -- return Obj : ... := new ...'(new Coextension ...);
17775 -- return Obj : ... := (new Coextension ...);
17777 elsif Nkind
(Context_Nod
) = N_Object_Declaration
then
17779 Nkind_In
(Root_Nod
, N_Allocator
, N_Qualified_Expression
)
17781 Nkind
(Parent
(Context_Nod
)) = N_Extended_Return_Statement
;
17783 -- This routine should not be called with constructs that cannot contain
17787 raise Program_Error
;
17790 Mark_Allocators
(Root_Nod
);
17791 end Mark_Coextensions
;
17793 ---------------------------------
17794 -- Mark_Elaboration_Attributes --
17795 ---------------------------------
17797 procedure Mark_Elaboration_Attributes
17798 (N_Id
: Node_Or_Entity_Id
;
17799 Checks
: Boolean := False;
17800 Level
: Boolean := False;
17801 Modes
: Boolean := False;
17802 Warnings
: Boolean := False)
17804 function Elaboration_Checks_OK
17805 (Target_Id
: Entity_Id
;
17806 Context_Id
: Entity_Id
) return Boolean;
17807 -- Determine whether elaboration checks are enabled for target Target_Id
17808 -- which resides within context Context_Id.
17810 procedure Mark_Elaboration_Attributes_Id
(Id
: Entity_Id
);
17811 -- Preserve relevant attributes of the context in arbitrary entity Id
17813 procedure Mark_Elaboration_Attributes_Node
(N
: Node_Id
);
17814 -- Preserve relevant attributes of the context in arbitrary node N
17816 ---------------------------
17817 -- Elaboration_Checks_OK --
17818 ---------------------------
17820 function Elaboration_Checks_OK
17821 (Target_Id
: Entity_Id
;
17822 Context_Id
: Entity_Id
) return Boolean
17824 Encl_Scop
: Entity_Id
;
17827 -- Elaboration checks are suppressed for the target
17829 if Elaboration_Checks_Suppressed
(Target_Id
) then
17833 -- Otherwise elaboration checks are OK for the target, but may be
17834 -- suppressed for the context where the target is declared.
17836 Encl_Scop
:= Context_Id
;
17837 while Present
(Encl_Scop
) and then Encl_Scop
/= Standard_Standard
loop
17838 if Elaboration_Checks_Suppressed
(Encl_Scop
) then
17842 Encl_Scop
:= Scope
(Encl_Scop
);
17845 -- Neither the target nor its declarative context have elaboration
17846 -- checks suppressed.
17849 end Elaboration_Checks_OK
;
17851 ------------------------------------
17852 -- Mark_Elaboration_Attributes_Id --
17853 ------------------------------------
17855 procedure Mark_Elaboration_Attributes_Id
(Id
: Entity_Id
) is
17857 -- Mark the status of elaboration checks in effect. Do not reset the
17858 -- status in case the entity is reanalyzed with checks suppressed.
17860 if Checks
and then not Is_Elaboration_Checks_OK_Id
(Id
) then
17861 Set_Is_Elaboration_Checks_OK_Id
(Id
,
17862 Elaboration_Checks_OK
17864 Context_Id
=> Scope
(Id
)));
17866 -- Entities do not need to capture their enclosing level. The Ghost
17867 -- and SPARK modes in effect are already marked during analysis.
17872 end Mark_Elaboration_Attributes_Id
;
17874 --------------------------------------
17875 -- Mark_Elaboration_Attributes_Node --
17876 --------------------------------------
17878 procedure Mark_Elaboration_Attributes_Node
(N
: Node_Id
) is
17879 function Extract_Name
(N
: Node_Id
) return Node_Id
;
17880 -- Obtain the Name attribute of call or instantiation N
17886 function Extract_Name
(N
: Node_Id
) return Node_Id
is
17892 -- A call to an entry family appears in indexed form
17894 if Nkind
(Nam
) = N_Indexed_Component
then
17895 Nam
:= Prefix
(Nam
);
17898 -- The name may also appear in qualified form
17900 if Nkind
(Nam
) = N_Selected_Component
then
17901 Nam
:= Selector_Name
(Nam
);
17909 Context_Id
: Entity_Id
;
17912 -- Start of processing for Mark_Elaboration_Attributes_Node
17915 -- Mark the status of elaboration checks in effect. Do not reset the
17916 -- status in case the node is reanalyzed with checks suppressed.
17918 if Checks
and then not Is_Elaboration_Checks_OK_Node
(N
) then
17920 -- Assignments, attribute references, and variable references do
17921 -- not have a "declarative" context.
17923 Context_Id
:= Empty
;
17925 -- The status of elaboration checks for calls and instantiations
17926 -- depends on the most recent pragma Suppress/Unsuppress, as well
17927 -- as the suppression status of the context where the target is
17931 -- function Func ...;
17935 -- procedure Main is
17936 -- pragma Suppress (Elaboration_Checks, Pack);
17937 -- X : ... := Pack.Func;
17940 -- In the example above, the call to Func has elaboration checks
17941 -- enabled because there is no active general purpose suppression
17942 -- pragma, however the elaboration checks of Pack are explicitly
17943 -- suppressed. As a result the elaboration checks of the call must
17944 -- be disabled in order to preserve this dependency.
17946 if Nkind_In
(N
, N_Entry_Call_Statement
,
17948 N_Function_Instantiation
,
17949 N_Package_Instantiation
,
17950 N_Procedure_Call_Statement
,
17951 N_Procedure_Instantiation
)
17953 Nam
:= Extract_Name
(N
);
17955 if Is_Entity_Name
(Nam
) and then Present
(Entity
(Nam
)) then
17956 Context_Id
:= Scope
(Entity
(Nam
));
17960 Set_Is_Elaboration_Checks_OK_Node
(N
,
17961 Elaboration_Checks_OK
17962 (Target_Id
=> Empty
,
17963 Context_Id
=> Context_Id
));
17966 -- Mark the enclosing level of the node. Do not reset the status in
17967 -- case the node is relocated and reanalyzed.
17969 if Level
and then not Is_Declaration_Level_Node
(N
) then
17970 Set_Is_Declaration_Level_Node
(N
,
17971 Find_Enclosing_Level
(N
) = Declaration_Level
);
17974 -- Mark the Ghost and SPARK mode in effect
17977 if Ghost_Mode
= Ignore
then
17978 Set_Is_Ignored_Ghost_Node
(N
);
17981 if SPARK_Mode
= On
then
17982 Set_Is_SPARK_Mode_On_Node
(N
);
17986 -- Mark the status of elaboration warnings in effect. Do not reset
17987 -- the status in case the node is reanalyzed with warnings off.
17989 if Warnings
and then not Is_Elaboration_Warnings_OK_Node
(N
) then
17990 Set_Is_Elaboration_Warnings_OK_Node
(N
, Elab_Warnings
);
17992 end Mark_Elaboration_Attributes_Node
;
17994 -- Start of processing for Mark_Elaboration_Attributes
17997 -- Do not capture any elaboration-related attributes when switch -gnatH
17998 -- (legacy elaboration checking mode enabled) is in effect because the
17999 -- attributes are useless to the legacy model.
18001 if Legacy_Elaboration_Checks
then
18005 if Nkind
(N_Id
) in N_Entity
then
18006 Mark_Elaboration_Attributes_Id
(N_Id
);
18008 Mark_Elaboration_Attributes_Node
(N_Id
);
18010 end Mark_Elaboration_Attributes
;
18012 ----------------------------------
18013 -- Matching_Static_Array_Bounds --
18014 ----------------------------------
18016 function Matching_Static_Array_Bounds
18018 R_Typ
: Node_Id
) return Boolean
18020 L_Ndims
: constant Nat
:= Number_Dimensions
(L_Typ
);
18021 R_Ndims
: constant Nat
:= Number_Dimensions
(R_Typ
);
18023 L_Index
: Node_Id
:= Empty
; -- init to ...
18024 R_Index
: Node_Id
:= Empty
; -- ...avoid warnings
18033 if L_Ndims
/= R_Ndims
then
18037 -- Unconstrained types do not have static bounds
18039 if not Is_Constrained
(L_Typ
) or else not Is_Constrained
(R_Typ
) then
18043 -- First treat specially the first dimension, as the lower bound and
18044 -- length of string literals are not stored like those of arrays.
18046 if Ekind
(L_Typ
) = E_String_Literal_Subtype
then
18047 L_Low
:= String_Literal_Low_Bound
(L_Typ
);
18048 L_Len
:= String_Literal_Length
(L_Typ
);
18050 L_Index
:= First_Index
(L_Typ
);
18051 Get_Index_Bounds
(L_Index
, L_Low
, L_High
);
18053 if Is_OK_Static_Expression
(L_Low
)
18055 Is_OK_Static_Expression
(L_High
)
18057 if Expr_Value
(L_High
) < Expr_Value
(L_Low
) then
18060 L_Len
:= (Expr_Value
(L_High
) - Expr_Value
(L_Low
)) + 1;
18067 if Ekind
(R_Typ
) = E_String_Literal_Subtype
then
18068 R_Low
:= String_Literal_Low_Bound
(R_Typ
);
18069 R_Len
:= String_Literal_Length
(R_Typ
);
18071 R_Index
:= First_Index
(R_Typ
);
18072 Get_Index_Bounds
(R_Index
, R_Low
, R_High
);
18074 if Is_OK_Static_Expression
(R_Low
)
18076 Is_OK_Static_Expression
(R_High
)
18078 if Expr_Value
(R_High
) < Expr_Value
(R_Low
) then
18081 R_Len
:= (Expr_Value
(R_High
) - Expr_Value
(R_Low
)) + 1;
18088 if (Is_OK_Static_Expression
(L_Low
)
18090 Is_OK_Static_Expression
(R_Low
))
18091 and then Expr_Value
(L_Low
) = Expr_Value
(R_Low
)
18092 and then L_Len
= R_Len
18099 -- Then treat all other dimensions
18101 for Indx
in 2 .. L_Ndims
loop
18105 Get_Index_Bounds
(L_Index
, L_Low
, L_High
);
18106 Get_Index_Bounds
(R_Index
, R_Low
, R_High
);
18108 if (Is_OK_Static_Expression
(L_Low
) and then
18109 Is_OK_Static_Expression
(L_High
) and then
18110 Is_OK_Static_Expression
(R_Low
) and then
18111 Is_OK_Static_Expression
(R_High
))
18112 and then (Expr_Value
(L_Low
) = Expr_Value
(R_Low
)
18114 Expr_Value
(L_High
) = Expr_Value
(R_High
))
18122 -- If we fall through the loop, all indexes matched
18125 end Matching_Static_Array_Bounds
;
18127 -------------------
18128 -- May_Be_Lvalue --
18129 -------------------
18131 function May_Be_Lvalue
(N
: Node_Id
) return Boolean is
18132 P
: constant Node_Id
:= Parent
(N
);
18137 -- Test left side of assignment
18139 when N_Assignment_Statement
=>
18140 return N
= Name
(P
);
18142 -- Test prefix of component or attribute. Note that the prefix of an
18143 -- explicit or implicit dereference cannot be an l-value. In the case
18144 -- of a 'Read attribute, the reference can be an actual in the
18145 -- argument list of the attribute.
18147 when N_Attribute_Reference
=>
18148 return (N
= Prefix
(P
)
18149 and then Name_Implies_Lvalue_Prefix
(Attribute_Name
(P
)))
18151 Attribute_Name
(P
) = Name_Read
;
18153 -- For an expanded name, the name is an lvalue if the expanded name
18154 -- is an lvalue, but the prefix is never an lvalue, since it is just
18155 -- the scope where the name is found.
18157 when N_Expanded_Name
=>
18158 if N
= Prefix
(P
) then
18159 return May_Be_Lvalue
(P
);
18164 -- For a selected component A.B, A is certainly an lvalue if A.B is.
18165 -- B is a little interesting, if we have A.B := 3, there is some
18166 -- discussion as to whether B is an lvalue or not, we choose to say
18167 -- it is. Note however that A is not an lvalue if it is of an access
18168 -- type since this is an implicit dereference.
18170 when N_Selected_Component
=>
18172 and then Present
(Etype
(N
))
18173 and then Is_Access_Type
(Etype
(N
))
18177 return May_Be_Lvalue
(P
);
18180 -- For an indexed component or slice, the index or slice bounds is
18181 -- never an lvalue. The prefix is an lvalue if the indexed component
18182 -- or slice is an lvalue, except if it is an access type, where we
18183 -- have an implicit dereference.
18185 when N_Indexed_Component
18189 or else (Present
(Etype
(N
)) and then Is_Access_Type
(Etype
(N
)))
18193 return May_Be_Lvalue
(P
);
18196 -- Prefix of a reference is an lvalue if the reference is an lvalue
18198 when N_Reference
=>
18199 return May_Be_Lvalue
(P
);
18201 -- Prefix of explicit dereference is never an lvalue
18203 when N_Explicit_Dereference
=>
18206 -- Positional parameter for subprogram, entry, or accept call.
18207 -- In older versions of Ada function call arguments are never
18208 -- lvalues. In Ada 2012 functions can have in-out parameters.
18210 when N_Accept_Statement
18211 | N_Entry_Call_Statement
18212 | N_Subprogram_Call
18214 if Nkind
(P
) = N_Function_Call
and then Ada_Version
< Ada_2012
then
18218 -- The following mechanism is clumsy and fragile. A single flag
18219 -- set in Resolve_Actuals would be preferable ???
18227 Proc
:= Get_Subprogram_Entity
(P
);
18233 -- If we are not a list member, something is strange, so be
18234 -- conservative and return True.
18236 if not Is_List_Member
(N
) then
18240 -- We are going to find the right formal by stepping forward
18241 -- through the formals, as we step backwards in the actuals.
18243 Form
:= First_Formal
(Proc
);
18246 -- If no formal, something is weird, so be conservative and
18254 exit when No
(Act
);
18255 Next_Formal
(Form
);
18258 return Ekind
(Form
) /= E_In_Parameter
;
18261 -- Named parameter for procedure or accept call
18263 when N_Parameter_Association
=>
18269 Proc
:= Get_Subprogram_Entity
(Parent
(P
));
18275 -- Loop through formals to find the one that matches
18277 Form
:= First_Formal
(Proc
);
18279 -- If no matching formal, that's peculiar, some kind of
18280 -- previous error, so return True to be conservative.
18281 -- Actually happens with legal code for an unresolved call
18282 -- where we may get the wrong homonym???
18288 -- Else test for match
18290 if Chars
(Form
) = Chars
(Selector_Name
(P
)) then
18291 return Ekind
(Form
) /= E_In_Parameter
;
18294 Next_Formal
(Form
);
18298 -- Test for appearing in a conversion that itself appears in an
18299 -- lvalue context, since this should be an lvalue.
18301 when N_Type_Conversion
=>
18302 return May_Be_Lvalue
(P
);
18304 -- Test for appearance in object renaming declaration
18306 when N_Object_Renaming_Declaration
=>
18309 -- All other references are definitely not lvalues
18320 function Might_Raise
(N
: Node_Id
) return Boolean is
18321 Result
: Boolean := False;
18323 function Process
(N
: Node_Id
) return Traverse_Result
;
18324 -- Set Result to True if we find something that could raise an exception
18330 function Process
(N
: Node_Id
) return Traverse_Result
is
18332 if Nkind_In
(N
, N_Procedure_Call_Statement
,
18335 N_Raise_Constraint_Error
,
18336 N_Raise_Program_Error
,
18337 N_Raise_Storage_Error
)
18346 procedure Set_Result
is new Traverse_Proc
(Process
);
18348 -- Start of processing for Might_Raise
18351 -- False if exceptions can't be propagated
18353 if No_Exception_Handlers_Set
then
18357 -- If the checks handled by the back end are not disabled, we cannot
18358 -- ensure that no exception will be raised.
18360 if not Access_Checks_Suppressed
(Empty
)
18361 or else not Discriminant_Checks_Suppressed
(Empty
)
18362 or else not Range_Checks_Suppressed
(Empty
)
18363 or else not Index_Checks_Suppressed
(Empty
)
18364 or else Opt
.Stack_Checking_Enabled
18373 --------------------------------
18374 -- Nearest_Enclosing_Instance --
18375 --------------------------------
18377 function Nearest_Enclosing_Instance
(E
: Entity_Id
) return Entity_Id
is
18382 while Present
(Inst
) and then Inst
/= Standard_Standard
loop
18383 if Is_Generic_Instance
(Inst
) then
18387 Inst
:= Scope
(Inst
);
18391 end Nearest_Enclosing_Instance
;
18393 ----------------------
18394 -- Needs_One_Actual --
18395 ----------------------
18397 function Needs_One_Actual
(E
: Entity_Id
) return Boolean is
18398 Formal
: Entity_Id
;
18401 -- Ada 2005 or later, and formals present. The first formal must be
18402 -- of a type that supports prefix notation: a controlling argument,
18403 -- a class-wide type, or an access to such.
18405 if Ada_Version
>= Ada_2005
18406 and then Present
(First_Formal
(E
))
18407 and then No
(Default_Value
(First_Formal
(E
)))
18409 (Is_Controlling_Formal
(First_Formal
(E
))
18410 or else Is_Class_Wide_Type
(Etype
(First_Formal
(E
)))
18411 or else Is_Anonymous_Access_Type
(Etype
(First_Formal
(E
))))
18413 Formal
:= Next_Formal
(First_Formal
(E
));
18414 while Present
(Formal
) loop
18415 if No
(Default_Value
(Formal
)) then
18419 Next_Formal
(Formal
);
18424 -- Ada 83/95 or no formals
18429 end Needs_One_Actual
;
18431 ------------------------
18432 -- New_Copy_List_Tree --
18433 ------------------------
18435 function New_Copy_List_Tree
(List
: List_Id
) return List_Id
is
18440 if List
= No_List
then
18447 while Present
(E
) loop
18448 Append
(New_Copy_Tree
(E
), NL
);
18454 end New_Copy_List_Tree
;
18456 -------------------
18457 -- New_Copy_Tree --
18458 -------------------
18460 -- The following tables play a key role in replicating entities and Itypes.
18461 -- They are intentionally declared at the library level rather than within
18462 -- New_Copy_Tree to avoid elaborating them on each call. This performance
18463 -- optimization saves up to 2% of the entire compilation time spent in the
18464 -- front end. Care should be taken to reset the tables on each new call to
18467 NCT_Table_Max
: constant := 511;
18469 subtype NCT_Table_Index
is Nat
range 0 .. NCT_Table_Max
- 1;
18471 function NCT_Table_Hash
(Key
: Node_Or_Entity_Id
) return NCT_Table_Index
;
18472 -- Obtain the hash value of node or entity Key
18474 --------------------
18475 -- NCT_Table_Hash --
18476 --------------------
18478 function NCT_Table_Hash
(Key
: Node_Or_Entity_Id
) return NCT_Table_Index
is
18480 return NCT_Table_Index
(Key
mod NCT_Table_Max
);
18481 end NCT_Table_Hash
;
18483 ----------------------
18484 -- NCT_New_Entities --
18485 ----------------------
18487 -- The following table maps old entities and Itypes to their corresponding
18488 -- new entities and Itypes.
18492 package NCT_New_Entities
is new Simple_HTable
(
18493 Header_Num
=> NCT_Table_Index
,
18494 Element
=> Entity_Id
,
18495 No_Element
=> Empty
,
18497 Hash
=> NCT_Table_Hash
,
18500 ------------------------
18501 -- NCT_Pending_Itypes --
18502 ------------------------
18504 -- The following table maps old Associated_Node_For_Itype nodes to a set of
18505 -- new itypes. Given a set of old Itypes Aaa, Bbb, and Ccc, where all three
18506 -- have the same Associated_Node_For_Itype Ppp, and their corresponding new
18507 -- Itypes Xxx, Yyy, Zzz, the table contains the following mapping:
18509 -- Ppp -> (Xxx, Yyy, Zzz)
18511 -- The set is expressed as an Elist
18513 package NCT_Pending_Itypes
is new Simple_HTable
(
18514 Header_Num
=> NCT_Table_Index
,
18515 Element
=> Elist_Id
,
18516 No_Element
=> No_Elist
,
18518 Hash
=> NCT_Table_Hash
,
18521 NCT_Tables_In_Use
: Boolean := False;
18522 -- This flag keeps track of whether the two tables NCT_New_Entities and
18523 -- NCT_Pending_Itypes are in use. The flag is part of an optimization
18524 -- where certain operations are not performed if the tables are not in
18525 -- use. This saves up to 8% of the entire compilation time spent in the
18528 -------------------
18529 -- New_Copy_Tree --
18530 -------------------
18532 function New_Copy_Tree
18534 Map
: Elist_Id
:= No_Elist
;
18535 New_Sloc
: Source_Ptr
:= No_Location
;
18536 New_Scope
: Entity_Id
:= Empty
) return Node_Id
18538 -- This routine performs low-level tree manipulations and needs access
18539 -- to the internals of the tree.
18541 use Atree
.Unchecked_Access
;
18542 use Atree_Private_Part
;
18544 EWA_Level
: Nat
:= 0;
18545 -- This counter keeps track of how many N_Expression_With_Actions nodes
18546 -- are encountered during a depth-first traversal of the subtree. These
18547 -- nodes may define new entities in their Actions lists and thus require
18548 -- special processing.
18550 EWA_Inner_Scope_Level
: Nat
:= 0;
18551 -- This counter keeps track of how many scoping constructs appear within
18552 -- an N_Expression_With_Actions node.
18554 procedure Add_New_Entity
(Old_Id
: Entity_Id
; New_Id
: Entity_Id
);
18555 pragma Inline
(Add_New_Entity
);
18556 -- Add an entry in the NCT_New_Entities table which maps key Old_Id to
18557 -- value New_Id. Old_Id is an entity which appears within the Actions
18558 -- list of an N_Expression_With_Actions node, or within an entity map.
18559 -- New_Id is the corresponding new entity generated during Phase 1.
18561 procedure Add_Pending_Itype
(Assoc_Nod
: Node_Id
; Itype
: Entity_Id
);
18562 pragma Inline
(Add_New_Entity
);
18563 -- Add an entry in the NCT_Pending_Itypes which maps key Assoc_Nod to
18564 -- value Itype. Assoc_Nod is the associated node of an itype. Itype is
18567 procedure Build_NCT_Tables
(Entity_Map
: Elist_Id
);
18568 pragma Inline
(Build_NCT_Tables
);
18569 -- Populate tables NCT_New_Entities and NCT_Pending_Itypes with the
18570 -- information supplied in entity map Entity_Map. The format of the
18571 -- entity map must be as follows:
18573 -- Old_Id1, New_Id1, Old_Id2, New_Id2, .., Old_IdN, New_IdN
18575 function Copy_Any_Node_With_Replacement
18576 (N
: Node_Or_Entity_Id
) return Node_Or_Entity_Id
;
18577 pragma Inline
(Copy_Any_Node_With_Replacement
);
18578 -- Replicate entity or node N by invoking one of the following routines:
18580 -- Copy_Node_With_Replacement
18581 -- Corresponding_Entity
18583 function Copy_Elist_With_Replacement
(List
: Elist_Id
) return Elist_Id
;
18584 -- Replicate the elements of entity list List
18586 function Copy_Field_With_Replacement
18588 Old_Par
: Node_Id
:= Empty
;
18589 New_Par
: Node_Id
:= Empty
;
18590 Semantic
: Boolean := False) return Union_Id
;
18591 -- Replicate field Field by invoking one of the following routines:
18593 -- Copy_Elist_With_Replacement
18594 -- Copy_List_With_Replacement
18595 -- Copy_Node_With_Replacement
18596 -- Corresponding_Entity
18598 -- If the field is not an entity list, entity, itype, syntactic list,
18599 -- or node, then the field is returned unchanged. The routine always
18600 -- replicates entities, itypes, and valid syntactic fields. Old_Par is
18601 -- the expected parent of a syntactic field. New_Par is the new parent
18602 -- associated with a replicated syntactic field. Flag Semantic should
18603 -- be set when the input is a semantic field.
18605 function Copy_List_With_Replacement
(List
: List_Id
) return List_Id
;
18606 -- Replicate the elements of syntactic list List
18608 function Copy_Node_With_Replacement
(N
: Node_Id
) return Node_Id
;
18609 -- Replicate node N
18611 function Corresponding_Entity
(Id
: Entity_Id
) return Entity_Id
;
18612 pragma Inline
(Corresponding_Entity
);
18613 -- Return the corresponding new entity of Id generated during Phase 1.
18614 -- If there is no such entity, return Id.
18616 function In_Entity_Map
18618 Entity_Map
: Elist_Id
) return Boolean;
18619 pragma Inline
(In_Entity_Map
);
18620 -- Determine whether entity Id is one of the old ids specified in entity
18621 -- map Entity_Map. The format of the entity map must be as follows:
18623 -- Old_Id1, New_Id1, Old_Id2, New_Id2, .., Old_IdN, New_IdN
18625 procedure Update_CFS_Sloc
(N
: Node_Or_Entity_Id
);
18626 pragma Inline
(Update_CFS_Sloc
);
18627 -- Update the Comes_From_Source and Sloc attributes of node or entity N
18629 procedure Update_First_Real_Statement
18630 (Old_HSS
: Node_Id
;
18631 New_HSS
: Node_Id
);
18632 pragma Inline
(Update_First_Real_Statement
);
18633 -- Update semantic attribute First_Real_Statement of handled sequence of
18634 -- statements New_HSS based on handled sequence of statements Old_HSS.
18636 procedure Update_Named_Associations
18637 (Old_Call
: Node_Id
;
18638 New_Call
: Node_Id
);
18639 pragma Inline
(Update_Named_Associations
);
18640 -- Update semantic chain First/Next_Named_Association of call New_call
18641 -- based on call Old_Call.
18643 procedure Update_New_Entities
(Entity_Map
: Elist_Id
);
18644 pragma Inline
(Update_New_Entities
);
18645 -- Update the semantic attributes of all new entities generated during
18646 -- Phase 1 that do not appear in entity map Entity_Map. The format of
18647 -- the entity map must be as follows:
18649 -- Old_Id1, New_Id1, Old_Id2, New_Id2, .., Old_IdN, New_IdN
18651 procedure Update_Pending_Itypes
18652 (Old_Assoc
: Node_Id
;
18653 New_Assoc
: Node_Id
);
18654 pragma Inline
(Update_Pending_Itypes
);
18655 -- Update semantic attribute Associated_Node_For_Itype to refer to node
18656 -- New_Assoc for all itypes whose associated node is Old_Assoc.
18658 procedure Update_Semantic_Fields
(Id
: Entity_Id
);
18659 pragma Inline
(Update_Semantic_Fields
);
18660 -- Subsidiary to Update_New_Entities. Update semantic fields of entity
18663 procedure Visit_Any_Node
(N
: Node_Or_Entity_Id
);
18664 pragma Inline
(Visit_Any_Node
);
18665 -- Visit entity of node N by invoking one of the following routines:
18671 procedure Visit_Elist
(List
: Elist_Id
);
18672 -- Visit the elements of entity list List
18674 procedure Visit_Entity
(Id
: Entity_Id
);
18675 -- Visit entity Id. This action may create a new entity of Id and save
18676 -- it in table NCT_New_Entities.
18678 procedure Visit_Field
18680 Par_Nod
: Node_Id
:= Empty
;
18681 Semantic
: Boolean := False);
18682 -- Visit field Field by invoking one of the following routines:
18690 -- If the field is not an entity list, entity, itype, syntactic list,
18691 -- or node, then the field is not visited. The routine always visits
18692 -- valid syntactic fields. Par_Nod is the expected parent of the
18693 -- syntactic field. Flag Semantic should be set when the input is a
18696 procedure Visit_Itype
(Itype
: Entity_Id
);
18697 -- Visit itype Itype. This action may create a new entity for Itype and
18698 -- save it in table NCT_New_Entities. In addition, the routine may map
18699 -- the associated node of Itype to the new itype in NCT_Pending_Itypes.
18701 procedure Visit_List
(List
: List_Id
);
18702 -- Visit the elements of syntactic list List
18704 procedure Visit_Node
(N
: Node_Id
);
18707 procedure Visit_Semantic_Fields
(Id
: Entity_Id
);
18708 pragma Inline
(Visit_Semantic_Fields
);
18709 -- Subsidiary to Visit_Entity and Visit_Itype. Visit common semantic
18710 -- fields of entity or itype Id.
18712 --------------------
18713 -- Add_New_Entity --
18714 --------------------
18716 procedure Add_New_Entity
(Old_Id
: Entity_Id
; New_Id
: Entity_Id
) is
18718 pragma Assert
(Present
(Old_Id
));
18719 pragma Assert
(Present
(New_Id
));
18720 pragma Assert
(Nkind
(Old_Id
) in N_Entity
);
18721 pragma Assert
(Nkind
(New_Id
) in N_Entity
);
18723 NCT_Tables_In_Use
:= True;
18725 -- Sanity check the NCT_New_Entities table. No previous mapping with
18726 -- key Old_Id should exist.
18728 pragma Assert
(No
(NCT_New_Entities
.Get
(Old_Id
)));
18730 -- Establish the mapping
18732 -- Old_Id -> New_Id
18734 NCT_New_Entities
.Set
(Old_Id
, New_Id
);
18735 end Add_New_Entity
;
18737 -----------------------
18738 -- Add_Pending_Itype --
18739 -----------------------
18741 procedure Add_Pending_Itype
(Assoc_Nod
: Node_Id
; Itype
: Entity_Id
) is
18745 pragma Assert
(Present
(Assoc_Nod
));
18746 pragma Assert
(Present
(Itype
));
18747 pragma Assert
(Nkind
(Itype
) in N_Entity
);
18748 pragma Assert
(Is_Itype
(Itype
));
18750 NCT_Tables_In_Use
:= True;
18752 -- It is not possible to sanity check the NCT_Pendint_Itypes table
18753 -- directly because a single node may act as the associated node for
18754 -- multiple itypes.
18756 Itypes
:= NCT_Pending_Itypes
.Get
(Assoc_Nod
);
18758 if No
(Itypes
) then
18759 Itypes
:= New_Elmt_List
;
18760 NCT_Pending_Itypes
.Set
(Assoc_Nod
, Itypes
);
18763 -- Establish the mapping
18765 -- Assoc_Nod -> (Itype, ...)
18767 -- Avoid inserting the same itype multiple times. This involves a
18768 -- linear search, however the set of itypes with the same associated
18769 -- node is very small.
18771 Append_Unique_Elmt
(Itype
, Itypes
);
18772 end Add_Pending_Itype
;
18774 ----------------------
18775 -- Build_NCT_Tables --
18776 ----------------------
18778 procedure Build_NCT_Tables
(Entity_Map
: Elist_Id
) is
18780 Old_Id
: Entity_Id
;
18781 New_Id
: Entity_Id
;
18784 -- Nothing to do when there is no entity map
18786 if No
(Entity_Map
) then
18790 Elmt
:= First_Elmt
(Entity_Map
);
18791 while Present
(Elmt
) loop
18793 -- Extract the (Old_Id, New_Id) pair from the entity map
18795 Old_Id
:= Node
(Elmt
);
18798 New_Id
:= Node
(Elmt
);
18801 -- Establish the following mapping within table NCT_New_Entities
18803 -- Old_Id -> New_Id
18805 Add_New_Entity
(Old_Id
, New_Id
);
18807 -- Establish the following mapping within table NCT_Pending_Itypes
18808 -- when the new entity is an itype.
18810 -- Assoc_Nod -> (New_Id, ...)
18812 -- IMPORTANT: the associated node is that of the old itype because
18813 -- the node will be replicated in Phase 2.
18815 if Is_Itype
(Old_Id
) then
18817 (Assoc_Nod
=> Associated_Node_For_Itype
(Old_Id
),
18821 end Build_NCT_Tables
;
18823 ------------------------------------
18824 -- Copy_Any_Node_With_Replacement --
18825 ------------------------------------
18827 function Copy_Any_Node_With_Replacement
18828 (N
: Node_Or_Entity_Id
) return Node_Or_Entity_Id
18831 if Nkind
(N
) in N_Entity
then
18832 return Corresponding_Entity
(N
);
18834 return Copy_Node_With_Replacement
(N
);
18836 end Copy_Any_Node_With_Replacement
;
18838 ---------------------------------
18839 -- Copy_Elist_With_Replacement --
18840 ---------------------------------
18842 function Copy_Elist_With_Replacement
(List
: Elist_Id
) return Elist_Id
is
18847 -- Copy the contents of the old list. Note that the list itself may
18848 -- be empty, in which case the routine returns a new empty list. This
18849 -- avoids sharing lists between subtrees. The element of an entity
18850 -- list could be an entity or a node, hence the invocation of routine
18851 -- Copy_Any_Node_With_Replacement.
18853 if Present
(List
) then
18854 Result
:= New_Elmt_List
;
18856 Elmt
:= First_Elmt
(List
);
18857 while Present
(Elmt
) loop
18859 (Copy_Any_Node_With_Replacement
(Node
(Elmt
)), Result
);
18864 -- Otherwise the list does not exist
18867 Result
:= No_Elist
;
18871 end Copy_Elist_With_Replacement
;
18873 ---------------------------------
18874 -- Copy_Field_With_Replacement --
18875 ---------------------------------
18877 function Copy_Field_With_Replacement
18879 Old_Par
: Node_Id
:= Empty
;
18880 New_Par
: Node_Id
:= Empty
;
18881 Semantic
: Boolean := False) return Union_Id
18884 -- The field is empty
18886 if Field
= Union_Id
(Empty
) then
18889 -- The field is an entity/itype/node
18891 elsif Field
in Node_Range
then
18893 Old_N
: constant Node_Id
:= Node_Id
(Field
);
18894 Syntactic
: constant Boolean := Parent
(Old_N
) = Old_Par
;
18899 -- The field is an entity/itype
18901 if Nkind
(Old_N
) in N_Entity
then
18903 -- An entity/itype is always replicated
18905 New_N
:= Corresponding_Entity
(Old_N
);
18907 -- Update the parent pointer when the entity is a syntactic
18908 -- field. Note that itypes do not have parent pointers.
18910 if Syntactic
and then New_N
/= Old_N
then
18911 Set_Parent
(New_N
, New_Par
);
18914 -- The field is a node
18917 -- A node is replicated when it is either a syntactic field
18918 -- or when the caller treats it as a semantic attribute.
18920 if Syntactic
or else Semantic
then
18921 New_N
:= Copy_Node_With_Replacement
(Old_N
);
18923 -- Update the parent pointer when the node is a syntactic
18926 if Syntactic
and then New_N
/= Old_N
then
18927 Set_Parent
(New_N
, New_Par
);
18930 -- Otherwise the node is returned unchanged
18937 return Union_Id
(New_N
);
18940 -- The field is an entity list
18942 elsif Field
in Elist_Range
then
18943 return Union_Id
(Copy_Elist_With_Replacement
(Elist_Id
(Field
)));
18945 -- The field is a syntactic list
18947 elsif Field
in List_Range
then
18949 Old_List
: constant List_Id
:= List_Id
(Field
);
18950 Syntactic
: constant Boolean := Parent
(Old_List
) = Old_Par
;
18952 New_List
: List_Id
;
18955 -- A list is replicated when it is either a syntactic field or
18956 -- when the caller treats it as a semantic attribute.
18958 if Syntactic
or else Semantic
then
18959 New_List
:= Copy_List_With_Replacement
(Old_List
);
18961 -- Update the parent pointer when the list is a syntactic
18964 if Syntactic
and then New_List
/= Old_List
then
18965 Set_Parent
(New_List
, New_Par
);
18968 -- Otherwise the list is returned unchanged
18971 New_List
:= Old_List
;
18974 return Union_Id
(New_List
);
18977 -- Otherwise the field denotes an attribute that does not need to be
18978 -- replicated (Chars, literals, etc).
18983 end Copy_Field_With_Replacement
;
18985 --------------------------------
18986 -- Copy_List_With_Replacement --
18987 --------------------------------
18989 function Copy_List_With_Replacement
(List
: List_Id
) return List_Id
is
18994 -- Copy the contents of the old list. Note that the list itself may
18995 -- be empty, in which case the routine returns a new empty list. This
18996 -- avoids sharing lists between subtrees. The element of a syntactic
18997 -- list is always a node, never an entity or itype, hence the call to
18998 -- routine Copy_Node_With_Replacement.
19000 if Present
(List
) then
19001 Result
:= New_List
;
19003 Elmt
:= First
(List
);
19004 while Present
(Elmt
) loop
19005 Append
(Copy_Node_With_Replacement
(Elmt
), Result
);
19010 -- Otherwise the list does not exist
19017 end Copy_List_With_Replacement
;
19019 --------------------------------
19020 -- Copy_Node_With_Replacement --
19021 --------------------------------
19023 function Copy_Node_With_Replacement
(N
: Node_Id
) return Node_Id
is
19027 -- Assume that the node must be returned unchanged
19031 if N
> Empty_Or_Error
then
19032 pragma Assert
(Nkind
(N
) not in N_Entity
);
19034 Result
:= New_Copy
(N
);
19036 Set_Field1
(Result
,
19037 Copy_Field_With_Replacement
19038 (Field
=> Field1
(Result
),
19040 New_Par
=> Result
));
19042 Set_Field2
(Result
,
19043 Copy_Field_With_Replacement
19044 (Field
=> Field2
(Result
),
19046 New_Par
=> Result
));
19048 Set_Field3
(Result
,
19049 Copy_Field_With_Replacement
19050 (Field
=> Field3
(Result
),
19052 New_Par
=> Result
));
19054 Set_Field4
(Result
,
19055 Copy_Field_With_Replacement
19056 (Field
=> Field4
(Result
),
19058 New_Par
=> Result
));
19060 Set_Field5
(Result
,
19061 Copy_Field_With_Replacement
19062 (Field
=> Field5
(Result
),
19064 New_Par
=> Result
));
19066 -- Update the Comes_From_Source and Sloc attributes of the node
19067 -- in case the caller has supplied new values.
19069 Update_CFS_Sloc
(Result
);
19071 -- Update the Associated_Node_For_Itype attribute of all itypes
19072 -- created during Phase 1 whose associated node is N. As a result
19073 -- the Associated_Node_For_Itype refers to the replicated node.
19074 -- No action needs to be taken when the Associated_Node_For_Itype
19075 -- refers to an entity because this was already handled during
19076 -- Phase 1, in Visit_Itype.
19078 Update_Pending_Itypes
19080 New_Assoc
=> Result
);
19082 -- Update the First/Next_Named_Association chain for a replicated
19085 if Nkind_In
(N
, N_Entry_Call_Statement
,
19087 N_Procedure_Call_Statement
)
19089 Update_Named_Associations
19091 New_Call
=> Result
);
19093 -- Update the Renamed_Object attribute of a replicated object
19096 elsif Nkind
(N
) = N_Object_Renaming_Declaration
then
19097 Set_Renamed_Object
(Defining_Entity
(Result
), Name
(Result
));
19099 -- Update the First_Real_Statement attribute of a replicated
19100 -- handled sequence of statements.
19102 elsif Nkind
(N
) = N_Handled_Sequence_Of_Statements
then
19103 Update_First_Real_Statement
19105 New_HSS
=> Result
);
19110 end Copy_Node_With_Replacement
;
19112 --------------------------
19113 -- Corresponding_Entity --
19114 --------------------------
19116 function Corresponding_Entity
(Id
: Entity_Id
) return Entity_Id
is
19117 New_Id
: Entity_Id
;
19118 Result
: Entity_Id
;
19121 -- Assume that the entity must be returned unchanged
19125 if Id
> Empty_Or_Error
then
19126 pragma Assert
(Nkind
(Id
) in N_Entity
);
19128 -- Determine whether the entity has a corresponding new entity
19129 -- generated during Phase 1 and if it does, use it.
19131 if NCT_Tables_In_Use
then
19132 New_Id
:= NCT_New_Entities
.Get
(Id
);
19134 if Present
(New_Id
) then
19141 end Corresponding_Entity
;
19143 -------------------
19144 -- In_Entity_Map --
19145 -------------------
19147 function In_Entity_Map
19149 Entity_Map
: Elist_Id
) return Boolean
19152 Old_Id
: Entity_Id
;
19155 -- The entity map contains pairs (Old_Id, New_Id). The advancement
19156 -- step always skips the New_Id portion of the pair.
19158 if Present
(Entity_Map
) then
19159 Elmt
:= First_Elmt
(Entity_Map
);
19160 while Present
(Elmt
) loop
19161 Old_Id
:= Node
(Elmt
);
19163 if Old_Id
= Id
then
19175 ---------------------
19176 -- Update_CFS_Sloc --
19177 ---------------------
19179 procedure Update_CFS_Sloc
(N
: Node_Or_Entity_Id
) is
19181 -- A new source location defaults the Comes_From_Source attribute
19183 if New_Sloc
/= No_Location
then
19184 Set_Comes_From_Source
(N
, Default_Node
.Comes_From_Source
);
19185 Set_Sloc
(N
, New_Sloc
);
19187 end Update_CFS_Sloc
;
19189 ---------------------------------
19190 -- Update_First_Real_Statement --
19191 ---------------------------------
19193 procedure Update_First_Real_Statement
19194 (Old_HSS
: Node_Id
;
19197 Old_First_Stmt
: constant Node_Id
:= First_Real_Statement
(Old_HSS
);
19199 New_Stmt
: Node_Id
;
19200 Old_Stmt
: Node_Id
;
19203 -- Recreate the First_Real_Statement attribute of a handled sequence
19204 -- of statements by traversing the statement lists of both sequences
19207 if Present
(Old_First_Stmt
) then
19208 New_Stmt
:= First
(Statements
(New_HSS
));
19209 Old_Stmt
:= First
(Statements
(Old_HSS
));
19210 while Present
(Old_Stmt
) and then Old_Stmt
/= Old_First_Stmt
loop
19215 pragma Assert
(Present
(New_Stmt
));
19216 pragma Assert
(Present
(Old_Stmt
));
19218 Set_First_Real_Statement
(New_HSS
, New_Stmt
);
19220 end Update_First_Real_Statement
;
19222 -------------------------------
19223 -- Update_Named_Associations --
19224 -------------------------------
19226 procedure Update_Named_Associations
19227 (Old_Call
: Node_Id
;
19228 New_Call
: Node_Id
)
19231 New_Next
: Node_Id
;
19233 Old_Next
: Node_Id
;
19236 -- Recreate the First/Next_Named_Actual chain of a call by traversing
19237 -- the chains of both the old and new calls in parallel.
19239 New_Act
:= First
(Parameter_Associations
(New_Call
));
19240 Old_Act
:= First
(Parameter_Associations
(Old_Call
));
19241 while Present
(Old_Act
) loop
19242 if Nkind
(Old_Act
) = N_Parameter_Association
19243 and then Present
(Next_Named_Actual
(Old_Act
))
19245 if First_Named_Actual
(Old_Call
) =
19246 Explicit_Actual_Parameter
(Old_Act
)
19248 Set_First_Named_Actual
(New_Call
,
19249 Explicit_Actual_Parameter
(New_Act
));
19252 -- Scan the actual parameter list to find the next suitable
19253 -- named actual. Note that the list may be out of order.
19255 New_Next
:= First
(Parameter_Associations
(New_Call
));
19256 Old_Next
:= First
(Parameter_Associations
(Old_Call
));
19257 while Nkind
(Old_Next
) /= N_Parameter_Association
19258 or else Explicit_Actual_Parameter
(Old_Next
) /=
19259 Next_Named_Actual
(Old_Act
)
19265 Set_Next_Named_Actual
(New_Act
,
19266 Explicit_Actual_Parameter
(New_Next
));
19272 end Update_Named_Associations
;
19274 -------------------------
19275 -- Update_New_Entities --
19276 -------------------------
19278 procedure Update_New_Entities
(Entity_Map
: Elist_Id
) is
19279 New_Id
: Entity_Id
:= Empty
;
19280 Old_Id
: Entity_Id
:= Empty
;
19283 if NCT_Tables_In_Use
then
19284 NCT_New_Entities
.Get_First
(Old_Id
, New_Id
);
19286 -- Update the semantic fields of all new entities created during
19287 -- Phase 1 which were not supplied via an entity map.
19288 -- ??? Is there a better way of distinguishing those?
19290 while Present
(Old_Id
) and then Present
(New_Id
) loop
19291 if not (Present
(Entity_Map
)
19292 and then In_Entity_Map
(Old_Id
, Entity_Map
))
19294 Update_Semantic_Fields
(New_Id
);
19297 NCT_New_Entities
.Get_Next
(Old_Id
, New_Id
);
19300 end Update_New_Entities
;
19302 ---------------------------
19303 -- Update_Pending_Itypes --
19304 ---------------------------
19306 procedure Update_Pending_Itypes
19307 (Old_Assoc
: Node_Id
;
19308 New_Assoc
: Node_Id
)
19314 if NCT_Tables_In_Use
then
19315 Itypes
:= NCT_Pending_Itypes
.Get
(Old_Assoc
);
19317 -- Update the Associated_Node_For_Itype attribute for all itypes
19318 -- which originally refer to Old_Assoc to designate New_Assoc.
19320 if Present
(Itypes
) then
19321 Item
:= First_Elmt
(Itypes
);
19322 while Present
(Item
) loop
19323 Set_Associated_Node_For_Itype
(Node
(Item
), New_Assoc
);
19329 end Update_Pending_Itypes
;
19331 ----------------------------
19332 -- Update_Semantic_Fields --
19333 ----------------------------
19335 procedure Update_Semantic_Fields
(Id
: Entity_Id
) is
19337 -- Discriminant_Constraint
19339 if Has_Discriminants
(Base_Type
(Id
)) then
19340 Set_Discriminant_Constraint
(Id
, Elist_Id
(
19341 Copy_Field_With_Replacement
19342 (Field
=> Union_Id
(Discriminant_Constraint
(Id
)),
19343 Semantic
=> True)));
19348 Set_Etype
(Id
, Node_Id
(
19349 Copy_Field_With_Replacement
19350 (Field
=> Union_Id
(Etype
(Id
)),
19351 Semantic
=> True)));
19354 -- Packed_Array_Impl_Type
19356 if Is_Array_Type
(Id
) then
19357 if Present
(First_Index
(Id
)) then
19358 Set_First_Index
(Id
, First
(List_Id
(
19359 Copy_Field_With_Replacement
19360 (Field
=> Union_Id
(List_Containing
(First_Index
(Id
))),
19361 Semantic
=> True))));
19364 if Is_Packed
(Id
) then
19365 Set_Packed_Array_Impl_Type
(Id
, Node_Id
(
19366 Copy_Field_With_Replacement
19367 (Field
=> Union_Id
(Packed_Array_Impl_Type
(Id
)),
19368 Semantic
=> True)));
19374 Set_Next_Entity
(Id
, Node_Id
(
19375 Copy_Field_With_Replacement
19376 (Field
=> Union_Id
(Next_Entity
(Id
)),
19377 Semantic
=> True)));
19381 if Is_Discrete_Type
(Id
) then
19382 Set_Scalar_Range
(Id
, Node_Id
(
19383 Copy_Field_With_Replacement
19384 (Field
=> Union_Id
(Scalar_Range
(Id
)),
19385 Semantic
=> True)));
19390 -- Update the scope when the caller specified an explicit one
19392 if Present
(New_Scope
) then
19393 Set_Scope
(Id
, New_Scope
);
19395 Set_Scope
(Id
, Node_Id
(
19396 Copy_Field_With_Replacement
19397 (Field
=> Union_Id
(Scope
(Id
)),
19398 Semantic
=> True)));
19400 end Update_Semantic_Fields
;
19402 --------------------
19403 -- Visit_Any_Node --
19404 --------------------
19406 procedure Visit_Any_Node
(N
: Node_Or_Entity_Id
) is
19408 if Nkind
(N
) in N_Entity
then
19409 if Is_Itype
(N
) then
19417 end Visit_Any_Node
;
19423 procedure Visit_Elist
(List
: Elist_Id
) is
19427 -- The element of an entity list could be an entity, itype, or a
19428 -- node, hence the call to Visit_Any_Node.
19430 if Present
(List
) then
19431 Elmt
:= First_Elmt
(List
);
19432 while Present
(Elmt
) loop
19433 Visit_Any_Node
(Node
(Elmt
));
19444 procedure Visit_Entity
(Id
: Entity_Id
) is
19445 New_Id
: Entity_Id
;
19448 pragma Assert
(Nkind
(Id
) in N_Entity
);
19449 pragma Assert
(not Is_Itype
(Id
));
19451 -- Nothing to do if the entity is not defined in the Actions list of
19452 -- an N_Expression_With_Actions node.
19454 if EWA_Level
= 0 then
19457 -- Nothing to do if the entity is defined within a scoping construct
19458 -- of an N_Expression_With_Actions node.
19460 elsif EWA_Inner_Scope_Level
> 0 then
19463 -- Nothing to do if the entity is not an object or a type. Relaxing
19464 -- this restriction leads to a performance penalty.
19466 elsif not Ekind_In
(Id
, E_Constant
, E_Variable
)
19467 and then not Is_Type
(Id
)
19471 -- Nothing to do if the entity was already visited
19473 elsif NCT_Tables_In_Use
19474 and then Present
(NCT_New_Entities
.Get
(Id
))
19478 -- Nothing to do if the declaration node of the entity is not within
19479 -- the subtree being replicated.
19481 elsif not In_Subtree
19482 (N
=> Declaration_Node
(Id
),
19488 -- Create a new entity by directly copying the old entity. This
19489 -- action causes all attributes of the old entity to be inherited.
19491 New_Id
:= New_Copy
(Id
);
19493 -- Create a new name for the new entity because the back end needs
19494 -- distinct names for debugging purposes.
19496 Set_Chars
(New_Id
, New_Internal_Name
('T'));
19498 -- Update the Comes_From_Source and Sloc attributes of the entity in
19499 -- case the caller has supplied new values.
19501 Update_CFS_Sloc
(New_Id
);
19503 -- Establish the following mapping within table NCT_New_Entities:
19507 Add_New_Entity
(Id
, New_Id
);
19509 -- Deal with the semantic fields of entities. The fields are visited
19510 -- because they may mention entities which reside within the subtree
19513 Visit_Semantic_Fields
(Id
);
19520 procedure Visit_Field
19522 Par_Nod
: Node_Id
:= Empty
;
19523 Semantic
: Boolean := False)
19526 -- The field is empty
19528 if Field
= Union_Id
(Empty
) then
19531 -- The field is an entity/itype/node
19533 elsif Field
in Node_Range
then
19535 N
: constant Node_Id
:= Node_Id
(Field
);
19538 -- The field is an entity/itype
19540 if Nkind
(N
) in N_Entity
then
19542 -- Itypes are always visited
19544 if Is_Itype
(N
) then
19547 -- An entity is visited when it is either a syntactic field
19548 -- or when the caller treats it as a semantic attribute.
19550 elsif Parent
(N
) = Par_Nod
or else Semantic
then
19554 -- The field is a node
19557 -- A node is visited when it is either a syntactic field or
19558 -- when the caller treats it as a semantic attribute.
19560 if Parent
(N
) = Par_Nod
or else Semantic
then
19566 -- The field is an entity list
19568 elsif Field
in Elist_Range
then
19569 Visit_Elist
(Elist_Id
(Field
));
19571 -- The field is a syntax list
19573 elsif Field
in List_Range
then
19575 List
: constant List_Id
:= List_Id
(Field
);
19578 -- A syntax list is visited when it is either a syntactic field
19579 -- or when the caller treats it as a semantic attribute.
19581 if Parent
(List
) = Par_Nod
or else Semantic
then
19586 -- Otherwise the field denotes information which does not need to be
19587 -- visited (chars, literals, etc.).
19598 procedure Visit_Itype
(Itype
: Entity_Id
) is
19599 New_Assoc
: Node_Id
;
19600 New_Itype
: Entity_Id
;
19601 Old_Assoc
: Node_Id
;
19604 pragma Assert
(Nkind
(Itype
) in N_Entity
);
19605 pragma Assert
(Is_Itype
(Itype
));
19607 -- Itypes that describe the designated type of access to subprograms
19608 -- have the structure of subprogram declarations, with signatures,
19609 -- etc. Either we duplicate the signatures completely, or choose to
19610 -- share such itypes, which is fine because their elaboration will
19611 -- have no side effects.
19613 if Ekind
(Itype
) = E_Subprogram_Type
then
19616 -- Nothing to do if the itype was already visited
19618 elsif NCT_Tables_In_Use
19619 and then Present
(NCT_New_Entities
.Get
(Itype
))
19623 -- Nothing to do if the associated node of the itype is not within
19624 -- the subtree being replicated.
19626 elsif not In_Subtree
19627 (N
=> Associated_Node_For_Itype
(Itype
),
19633 -- Create a new itype by directly copying the old itype. This action
19634 -- causes all attributes of the old itype to be inherited.
19636 New_Itype
:= New_Copy
(Itype
);
19638 -- Create a new name for the new itype because the back end requires
19639 -- distinct names for debugging purposes.
19641 Set_Chars
(New_Itype
, New_Internal_Name
('T'));
19643 -- Update the Comes_From_Source and Sloc attributes of the itype in
19644 -- case the caller has supplied new values.
19646 Update_CFS_Sloc
(New_Itype
);
19648 -- Establish the following mapping within table NCT_New_Entities:
19650 -- Itype -> New_Itype
19652 Add_New_Entity
(Itype
, New_Itype
);
19654 -- The new itype must be unfrozen because the resulting subtree may
19655 -- be inserted anywhere and cause an earlier or later freezing.
19657 if Present
(Freeze_Node
(New_Itype
)) then
19658 Set_Freeze_Node
(New_Itype
, Empty
);
19659 Set_Is_Frozen
(New_Itype
, False);
19662 -- If a record subtype is simply copied, the entity list will be
19663 -- shared. Thus cloned_Subtype must be set to indicate the sharing.
19664 -- ??? What does this do?
19666 if Ekind_In
(Itype
, E_Class_Wide_Subtype
, E_Record_Subtype
) then
19667 Set_Cloned_Subtype
(New_Itype
, Itype
);
19670 -- The associated node may denote an entity, in which case it may
19671 -- already have a new corresponding entity created during a prior
19672 -- call to Visit_Entity or Visit_Itype for the same subtree.
19675 -- Old_Assoc ---------> New_Assoc
19677 -- Created by Visit_Itype
19678 -- Itype -------------> New_Itype
19679 -- ANFI = Old_Assoc ANFI = Old_Assoc < must be updated
19681 -- In the example above, Old_Assoc is an arbitrary entity that was
19682 -- already visited for the same subtree and has a corresponding new
19683 -- entity New_Assoc. Old_Assoc was inherited by New_Itype by virtue
19684 -- of copying entities, however it must be updated to New_Assoc.
19686 Old_Assoc
:= Associated_Node_For_Itype
(Itype
);
19688 if Nkind
(Old_Assoc
) in N_Entity
then
19689 if NCT_Tables_In_Use
then
19690 New_Assoc
:= NCT_New_Entities
.Get
(Old_Assoc
);
19692 if Present
(New_Assoc
) then
19693 Set_Associated_Node_For_Itype
(New_Itype
, New_Assoc
);
19697 -- Otherwise the associated node denotes a node. Postpone the update
19698 -- until Phase 2 when the node is replicated. Establish the following
19699 -- mapping within table NCT_Pending_Itypes:
19701 -- Old_Assoc -> (New_Type, ...)
19704 Add_Pending_Itype
(Old_Assoc
, New_Itype
);
19707 -- Deal with the semantic fields of itypes. The fields are visited
19708 -- because they may mention entities that reside within the subtree
19711 Visit_Semantic_Fields
(Itype
);
19718 procedure Visit_List
(List
: List_Id
) is
19722 -- Note that the element of a syntactic list is always a node, never
19723 -- an entity or itype, hence the call to Visit_Node.
19725 if Present
(List
) then
19726 Elmt
:= First
(List
);
19727 while Present
(Elmt
) loop
19739 procedure Visit_Node
(N
: Node_Or_Entity_Id
) is
19741 pragma Assert
(Nkind
(N
) not in N_Entity
);
19743 if Nkind
(N
) = N_Expression_With_Actions
then
19744 EWA_Level
:= EWA_Level
+ 1;
19746 elsif EWA_Level
> 0
19747 and then Nkind_In
(N
, N_Block_Statement
,
19749 N_Subprogram_Declaration
)
19751 EWA_Inner_Scope_Level
:= EWA_Inner_Scope_Level
+ 1;
19755 (Field
=> Field1
(N
),
19759 (Field
=> Field2
(N
),
19763 (Field
=> Field3
(N
),
19767 (Field
=> Field4
(N
),
19771 (Field
=> Field5
(N
),
19775 and then Nkind_In
(N
, N_Block_Statement
,
19777 N_Subprogram_Declaration
)
19779 EWA_Inner_Scope_Level
:= EWA_Inner_Scope_Level
- 1;
19781 elsif Nkind
(N
) = N_Expression_With_Actions
then
19782 EWA_Level
:= EWA_Level
- 1;
19786 ---------------------------
19787 -- Visit_Semantic_Fields --
19788 ---------------------------
19790 procedure Visit_Semantic_Fields
(Id
: Entity_Id
) is
19792 pragma Assert
(Nkind
(Id
) in N_Entity
);
19794 -- Discriminant_Constraint
19796 if Has_Discriminants
(Base_Type
(Id
)) then
19798 (Field
=> Union_Id
(Discriminant_Constraint
(Id
)),
19805 (Field
=> Union_Id
(Etype
(Id
)),
19809 -- Packed_Array_Impl_Type
19811 if Is_Array_Type
(Id
) then
19812 if Present
(First_Index
(Id
)) then
19814 (Field
=> Union_Id
(List_Containing
(First_Index
(Id
))),
19818 if Is_Packed
(Id
) then
19820 (Field
=> Union_Id
(Packed_Array_Impl_Type
(Id
)),
19827 if Is_Discrete_Type
(Id
) then
19829 (Field
=> Union_Id
(Scalar_Range
(Id
)),
19832 end Visit_Semantic_Fields
;
19834 -- Start of processing for New_Copy_Tree
19837 -- Routine New_Copy_Tree performs a deep copy of a subtree by creating
19838 -- shallow copies for each node within, and then updating the child and
19839 -- parent pointers accordingly. This process is straightforward, however
19840 -- the routine must deal with the following complications:
19842 -- * Entities defined within N_Expression_With_Actions nodes must be
19843 -- replicated rather than shared to avoid introducing two identical
19844 -- symbols within the same scope. Note that no other expression can
19845 -- currently define entities.
19848 -- Source_Low : ...;
19849 -- Source_High : ...;
19851 -- <reference to Source_Low>
19852 -- <reference to Source_High>
19855 -- New_Copy_Tree handles this case by first creating new entities
19856 -- and then updating all existing references to point to these new
19863 -- <reference to New_Low>
19864 -- <reference to New_High>
19867 -- * Itypes defined within the subtree must be replicated to avoid any
19868 -- dependencies on invalid or inaccessible data.
19870 -- subtype Source_Itype is ... range Source_Low .. Source_High;
19872 -- New_Copy_Tree handles this case by first creating a new itype in
19873 -- the same fashion as entities, and then updating various relevant
19876 -- subtype New_Itype is ... range New_Low .. New_High;
19878 -- * The Associated_Node_For_Itype field of itypes must be updated to
19879 -- reference the proper replicated entity or node.
19881 -- * Semantic fields of entities such as Etype and Scope must be
19882 -- updated to reference the proper replicated entities.
19884 -- * Semantic fields of nodes such as First_Real_Statement must be
19885 -- updated to reference the proper replicated nodes.
19887 -- To meet all these demands, routine New_Copy_Tree is split into two
19890 -- Phase 1 traverses the tree in order to locate entities and itypes
19891 -- defined within the subtree. New entities are generated and saved in
19892 -- table NCT_New_Entities. The semantic fields of all new entities and
19893 -- itypes are then updated accordingly.
19895 -- Phase 2 traverses the tree in order to replicate each node. Various
19896 -- semantic fields of nodes and entities are updated accordingly.
19898 -- Preparatory phase. Clear the contents of tables NCT_New_Entities and
19899 -- NCT_Pending_Itypes in case a previous call to New_Copy_Tree left some
19902 if NCT_Tables_In_Use
then
19903 NCT_Tables_In_Use
:= False;
19905 NCT_New_Entities
.Reset
;
19906 NCT_Pending_Itypes
.Reset
;
19909 -- Populate tables NCT_New_Entities and NCT_Pending_Itypes with data
19910 -- supplied by a linear entity map. The tables offer faster access to
19913 Build_NCT_Tables
(Map
);
19915 -- Execute Phase 1. Traverse the subtree and generate new entities for
19916 -- the following cases:
19918 -- * An entity defined within an N_Expression_With_Actions node
19920 -- * An itype referenced within the subtree where the associated node
19921 -- is also in the subtree.
19923 -- All new entities are accessible via table NCT_New_Entities, which
19924 -- contains mappings of the form:
19926 -- Old_Entity -> New_Entity
19927 -- Old_Itype -> New_Itype
19929 -- In addition, the associated nodes of all new itypes are mapped in
19930 -- table NCT_Pending_Itypes:
19932 -- Assoc_Nod -> (New_Itype1, New_Itype2, .., New_ItypeN)
19934 Visit_Any_Node
(Source
);
19936 -- Update the semantic attributes of all new entities generated during
19937 -- Phase 1 before starting Phase 2. The updates could be performed in
19938 -- routine Corresponding_Entity, however this may cause the same entity
19939 -- to be updated multiple times, effectively generating useless nodes.
19940 -- Keeping the updates separates from Phase 2 ensures that only one set
19941 -- of attributes is generated for an entity at any one time.
19943 Update_New_Entities
(Map
);
19945 -- Execute Phase 2. Replicate the source subtree one node at a time.
19946 -- The following transformations take place:
19948 -- * References to entities and itypes are updated to refer to the
19949 -- new entities and itypes generated during Phase 1.
19951 -- * All Associated_Node_For_Itype attributes of itypes are updated
19952 -- to refer to the new replicated Associated_Node_For_Itype.
19954 return Copy_Node_With_Replacement
(Source
);
19957 -------------------------
19958 -- New_External_Entity --
19959 -------------------------
19961 function New_External_Entity
19962 (Kind
: Entity_Kind
;
19963 Scope_Id
: Entity_Id
;
19964 Sloc_Value
: Source_Ptr
;
19965 Related_Id
: Entity_Id
;
19966 Suffix
: Character;
19967 Suffix_Index
: Nat
:= 0;
19968 Prefix
: Character := ' ') return Entity_Id
19970 N
: constant Entity_Id
:=
19971 Make_Defining_Identifier
(Sloc_Value
,
19973 (Chars
(Related_Id
), Suffix
, Suffix_Index
, Prefix
));
19976 Set_Ekind
(N
, Kind
);
19977 Set_Is_Internal
(N
, True);
19978 Append_Entity
(N
, Scope_Id
);
19979 Set_Public_Status
(N
);
19981 if Kind
in Type_Kind
then
19982 Init_Size_Align
(N
);
19986 end New_External_Entity
;
19988 -------------------------
19989 -- New_Internal_Entity --
19990 -------------------------
19992 function New_Internal_Entity
19993 (Kind
: Entity_Kind
;
19994 Scope_Id
: Entity_Id
;
19995 Sloc_Value
: Source_Ptr
;
19996 Id_Char
: Character) return Entity_Id
19998 N
: constant Entity_Id
:= Make_Temporary
(Sloc_Value
, Id_Char
);
20001 Set_Ekind
(N
, Kind
);
20002 Set_Is_Internal
(N
, True);
20003 Append_Entity
(N
, Scope_Id
);
20005 if Kind
in Type_Kind
then
20006 Init_Size_Align
(N
);
20010 end New_Internal_Entity
;
20016 function Next_Actual
(Actual_Id
: Node_Id
) return Node_Id
is
20020 -- If we are pointing at a positional parameter, it is a member of a
20021 -- node list (the list of parameters), and the next parameter is the
20022 -- next node on the list, unless we hit a parameter association, then
20023 -- we shift to using the chain whose head is the First_Named_Actual in
20024 -- the parent, and then is threaded using the Next_Named_Actual of the
20025 -- Parameter_Association. All this fiddling is because the original node
20026 -- list is in the textual call order, and what we need is the
20027 -- declaration order.
20029 if Is_List_Member
(Actual_Id
) then
20030 N
:= Next
(Actual_Id
);
20032 if Nkind
(N
) = N_Parameter_Association
then
20034 -- In case of a build-in-place call, the call will no longer be a
20035 -- call; it will have been rewritten.
20037 if Nkind_In
(Parent
(Actual_Id
), N_Entry_Call_Statement
,
20039 N_Procedure_Call_Statement
)
20041 return First_Named_Actual
(Parent
(Actual_Id
));
20050 return Next_Named_Actual
(Parent
(Actual_Id
));
20054 procedure Next_Actual
(Actual_Id
: in out Node_Id
) is
20056 Actual_Id
:= Next_Actual
(Actual_Id
);
20063 function Next_Global
(Node
: Node_Id
) return Node_Id
is
20065 -- The global item may either be in a list, or by itself, in which case
20066 -- there is no next global item with the same mode.
20068 if Is_List_Member
(Node
) then
20069 return Next
(Node
);
20075 procedure Next_Global
(Node
: in out Node_Id
) is
20077 Node
:= Next_Global
(Node
);
20080 ----------------------------------
20081 -- New_Requires_Transient_Scope --
20082 ----------------------------------
20084 function New_Requires_Transient_Scope
(Id
: Entity_Id
) return Boolean is
20085 function Caller_Known_Size_Record
(Typ
: Entity_Id
) return Boolean;
20086 -- This is called for untagged records and protected types, with
20087 -- nondefaulted discriminants. Returns True if the size of function
20088 -- results is known at the call site, False otherwise. Returns False
20089 -- if there is a variant part that depends on the discriminants of
20090 -- this type, or if there is an array constrained by the discriminants
20091 -- of this type. ???Currently, this is overly conservative (the array
20092 -- could be nested inside some other record that is constrained by
20093 -- nondiscriminants). That is, the recursive calls are too conservative.
20095 function Large_Max_Size_Mutable
(Typ
: Entity_Id
) return Boolean;
20096 -- Returns True if Typ is a nonlimited record with defaulted
20097 -- discriminants whose max size makes it unsuitable for allocating on
20098 -- the primary stack.
20100 ------------------------------
20101 -- Caller_Known_Size_Record --
20102 ------------------------------
20104 function Caller_Known_Size_Record
(Typ
: Entity_Id
) return Boolean is
20105 pragma Assert
(Typ
= Underlying_Type
(Typ
));
20108 if Has_Variant_Part
(Typ
) and then not Is_Definite_Subtype
(Typ
) then
20116 Comp
:= First_Entity
(Typ
);
20117 while Present
(Comp
) loop
20119 -- Only look at E_Component entities. No need to look at
20120 -- E_Discriminant entities, and we must ignore internal
20121 -- subtypes generated for constrained components.
20123 if Ekind
(Comp
) = E_Component
then
20125 Comp_Type
: constant Entity_Id
:=
20126 Underlying_Type
(Etype
(Comp
));
20129 if Is_Record_Type
(Comp_Type
)
20131 Is_Protected_Type
(Comp_Type
)
20133 if not Caller_Known_Size_Record
(Comp_Type
) then
20137 elsif Is_Array_Type
(Comp_Type
) then
20138 if Size_Depends_On_Discriminant
(Comp_Type
) then
20145 Next_Entity
(Comp
);
20150 end Caller_Known_Size_Record
;
20152 ------------------------------
20153 -- Large_Max_Size_Mutable --
20154 ------------------------------
20156 function Large_Max_Size_Mutable
(Typ
: Entity_Id
) return Boolean is
20157 pragma Assert
(Typ
= Underlying_Type
(Typ
));
20159 function Is_Large_Discrete_Type
(T
: Entity_Id
) return Boolean;
20160 -- Returns true if the discrete type T has a large range
20162 ----------------------------
20163 -- Is_Large_Discrete_Type --
20164 ----------------------------
20166 function Is_Large_Discrete_Type
(T
: Entity_Id
) return Boolean is
20167 Threshold
: constant Int
:= 16;
20168 -- Arbitrary threshold above which we consider it "large". We want
20169 -- a fairly large threshold, because these large types really
20170 -- shouldn't have default discriminants in the first place, in
20174 return UI_To_Int
(RM_Size
(T
)) > Threshold
;
20175 end Is_Large_Discrete_Type
;
20177 -- Start of processing for Large_Max_Size_Mutable
20180 if Is_Record_Type
(Typ
)
20181 and then not Is_Limited_View
(Typ
)
20182 and then Has_Defaulted_Discriminants
(Typ
)
20184 -- Loop through the components, looking for an array whose upper
20185 -- bound(s) depends on discriminants, where both the subtype of
20186 -- the discriminant and the index subtype are too large.
20192 Comp
:= First_Entity
(Typ
);
20193 while Present
(Comp
) loop
20194 if Ekind
(Comp
) = E_Component
then
20196 Comp_Type
: constant Entity_Id
:=
20197 Underlying_Type
(Etype
(Comp
));
20204 if Is_Array_Type
(Comp_Type
) then
20205 Indx
:= First_Index
(Comp_Type
);
20207 while Present
(Indx
) loop
20208 Ityp
:= Etype
(Indx
);
20209 Hi
:= Type_High_Bound
(Ityp
);
20211 if Nkind
(Hi
) = N_Identifier
20212 and then Ekind
(Entity
(Hi
)) = E_Discriminant
20213 and then Is_Large_Discrete_Type
(Ityp
)
20214 and then Is_Large_Discrete_Type
20215 (Etype
(Entity
(Hi
)))
20226 Next_Entity
(Comp
);
20232 end Large_Max_Size_Mutable
;
20234 -- Local declarations
20236 Typ
: constant Entity_Id
:= Underlying_Type
(Id
);
20238 -- Start of processing for New_Requires_Transient_Scope
20241 -- This is a private type which is not completed yet. This can only
20242 -- happen in a default expression (of a formal parameter or of a
20243 -- record component). Do not expand transient scope in this case.
20248 -- Do not expand transient scope for non-existent procedure return or
20249 -- string literal types.
20251 elsif Typ
= Standard_Void_Type
20252 or else Ekind
(Typ
) = E_String_Literal_Subtype
20256 -- If Typ is a generic formal incomplete type, then we want to look at
20257 -- the actual type.
20259 elsif Ekind
(Typ
) = E_Record_Subtype
20260 and then Present
(Cloned_Subtype
(Typ
))
20262 return New_Requires_Transient_Scope
(Cloned_Subtype
(Typ
));
20264 -- Functions returning specific tagged types may dispatch on result, so
20265 -- their returned value is allocated on the secondary stack, even in the
20266 -- definite case. We must treat nondispatching functions the same way,
20267 -- because access-to-function types can point at both, so the calling
20268 -- conventions must be compatible. Is_Tagged_Type includes controlled
20269 -- types and class-wide types. Controlled type temporaries need
20272 -- ???It's not clear why we need to return noncontrolled types with
20273 -- controlled components on the secondary stack.
20275 elsif Is_Tagged_Type
(Typ
) or else Has_Controlled_Component
(Typ
) then
20278 -- Untagged definite subtypes are known size. This includes all
20279 -- elementary [sub]types. Tasks are known size even if they have
20280 -- discriminants. So we return False here, with one exception:
20281 -- For a type like:
20282 -- type T (Last : Natural := 0) is
20283 -- X : String (1 .. Last);
20285 -- we return True. That's because for "P(F(...));", where F returns T,
20286 -- we don't know the size of the result at the call site, so if we
20287 -- allocated it on the primary stack, we would have to allocate the
20288 -- maximum size, which is way too big.
20290 elsif Is_Definite_Subtype
(Typ
) or else Is_Task_Type
(Typ
) then
20291 return Large_Max_Size_Mutable
(Typ
);
20293 -- Indefinite (discriminated) untagged record or protected type
20295 elsif Is_Record_Type
(Typ
) or else Is_Protected_Type
(Typ
) then
20296 return not Caller_Known_Size_Record
(Typ
);
20298 -- Unconstrained array
20301 pragma Assert
(Is_Array_Type
(Typ
) and not Is_Definite_Subtype
(Typ
));
20304 end New_Requires_Transient_Scope
;
20306 --------------------------
20307 -- No_Heap_Finalization --
20308 --------------------------
20310 function No_Heap_Finalization
(Typ
: Entity_Id
) return Boolean is
20312 if Ekind_In
(Typ
, E_Access_Type
, E_General_Access_Type
)
20313 and then Is_Library_Level_Entity
(Typ
)
20315 -- A global No_Heap_Finalization pragma applies to all library-level
20316 -- named access-to-object types.
20318 if Present
(No_Heap_Finalization_Pragma
) then
20321 -- The library-level named access-to-object type itself is subject to
20322 -- pragma No_Heap_Finalization.
20324 elsif Present
(Get_Pragma
(Typ
, Pragma_No_Heap_Finalization
)) then
20330 end No_Heap_Finalization
;
20332 -----------------------
20333 -- Normalize_Actuals --
20334 -----------------------
20336 -- Chain actuals according to formals of subprogram. If there are no named
20337 -- associations, the chain is simply the list of Parameter Associations,
20338 -- since the order is the same as the declaration order. If there are named
20339 -- associations, then the First_Named_Actual field in the N_Function_Call
20340 -- or N_Procedure_Call_Statement node points to the Parameter_Association
20341 -- node for the parameter that comes first in declaration order. The
20342 -- remaining named parameters are then chained in declaration order using
20343 -- Next_Named_Actual.
20345 -- This routine also verifies that the number of actuals is compatible with
20346 -- the number and default values of formals, but performs no type checking
20347 -- (type checking is done by the caller).
20349 -- If the matching succeeds, Success is set to True and the caller proceeds
20350 -- with type-checking. If the match is unsuccessful, then Success is set to
20351 -- False, and the caller attempts a different interpretation, if there is
20354 -- If the flag Report is on, the call is not overloaded, and a failure to
20355 -- match can be reported here, rather than in the caller.
20357 procedure Normalize_Actuals
20361 Success
: out Boolean)
20363 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
20364 Actual
: Node_Id
:= Empty
;
20365 Formal
: Entity_Id
;
20366 Last
: Node_Id
:= Empty
;
20367 First_Named
: Node_Id
:= Empty
;
20370 Formals_To_Match
: Integer := 0;
20371 Actuals_To_Match
: Integer := 0;
20373 procedure Chain
(A
: Node_Id
);
20374 -- Add named actual at the proper place in the list, using the
20375 -- Next_Named_Actual link.
20377 function Reporting
return Boolean;
20378 -- Determines if an error is to be reported. To report an error, we
20379 -- need Report to be True, and also we do not report errors caused
20380 -- by calls to init procs that occur within other init procs. Such
20381 -- errors must always be cascaded errors, since if all the types are
20382 -- declared correctly, the compiler will certainly build decent calls.
20388 procedure Chain
(A
: Node_Id
) is
20392 -- Call node points to first actual in list
20394 Set_First_Named_Actual
(N
, Explicit_Actual_Parameter
(A
));
20397 Set_Next_Named_Actual
(Last
, Explicit_Actual_Parameter
(A
));
20401 Set_Next_Named_Actual
(Last
, Empty
);
20408 function Reporting
return Boolean is
20413 elsif not Within_Init_Proc
then
20416 elsif Is_Init_Proc
(Entity
(Name
(N
))) then
20424 -- Start of processing for Normalize_Actuals
20427 if Is_Access_Type
(S
) then
20429 -- The name in the call is a function call that returns an access
20430 -- to subprogram. The designated type has the list of formals.
20432 Formal
:= First_Formal
(Designated_Type
(S
));
20434 Formal
:= First_Formal
(S
);
20437 while Present
(Formal
) loop
20438 Formals_To_Match
:= Formals_To_Match
+ 1;
20439 Next_Formal
(Formal
);
20442 -- Find if there is a named association, and verify that no positional
20443 -- associations appear after named ones.
20445 if Present
(Actuals
) then
20446 Actual
:= First
(Actuals
);
20449 while Present
(Actual
)
20450 and then Nkind
(Actual
) /= N_Parameter_Association
20452 Actuals_To_Match
:= Actuals_To_Match
+ 1;
20456 if No
(Actual
) and Actuals_To_Match
= Formals_To_Match
then
20458 -- Most common case: positional notation, no defaults
20463 elsif Actuals_To_Match
> Formals_To_Match
then
20465 -- Too many actuals: will not work
20468 if Is_Entity_Name
(Name
(N
)) then
20469 Error_Msg_N
("too many arguments in call to&", Name
(N
));
20471 Error_Msg_N
("too many arguments in call", N
);
20479 First_Named
:= Actual
;
20481 while Present
(Actual
) loop
20482 if Nkind
(Actual
) /= N_Parameter_Association
then
20484 ("positional parameters not allowed after named ones", Actual
);
20489 Actuals_To_Match
:= Actuals_To_Match
+ 1;
20495 if Present
(Actuals
) then
20496 Actual
:= First
(Actuals
);
20499 Formal
:= First_Formal
(S
);
20500 while Present
(Formal
) loop
20502 -- Match the formals in order. If the corresponding actual is
20503 -- positional, nothing to do. Else scan the list of named actuals
20504 -- to find the one with the right name.
20506 if Present
(Actual
)
20507 and then Nkind
(Actual
) /= N_Parameter_Association
20510 Actuals_To_Match
:= Actuals_To_Match
- 1;
20511 Formals_To_Match
:= Formals_To_Match
- 1;
20514 -- For named parameters, search the list of actuals to find
20515 -- one that matches the next formal name.
20517 Actual
:= First_Named
;
20519 while Present
(Actual
) loop
20520 if Chars
(Selector_Name
(Actual
)) = Chars
(Formal
) then
20523 Actuals_To_Match
:= Actuals_To_Match
- 1;
20524 Formals_To_Match
:= Formals_To_Match
- 1;
20532 if Ekind
(Formal
) /= E_In_Parameter
20533 or else No
(Default_Value
(Formal
))
20536 if (Comes_From_Source
(S
)
20537 or else Sloc
(S
) = Standard_Location
)
20538 and then Is_Overloadable
(S
)
20542 Nkind_In
(Parent
(N
), N_Procedure_Call_Statement
,
20544 N_Parameter_Association
)
20545 and then Ekind
(S
) /= E_Function
20547 Set_Etype
(N
, Etype
(S
));
20550 Error_Msg_Name_1
:= Chars
(S
);
20551 Error_Msg_Sloc
:= Sloc
(S
);
20553 ("missing argument for parameter & "
20554 & "in call to % declared #", N
, Formal
);
20557 elsif Is_Overloadable
(S
) then
20558 Error_Msg_Name_1
:= Chars
(S
);
20560 -- Point to type derivation that generated the
20563 Error_Msg_Sloc
:= Sloc
(Parent
(S
));
20566 ("missing argument for parameter & "
20567 & "in call to % (inherited) #", N
, Formal
);
20571 ("missing argument for parameter &", N
, Formal
);
20579 Formals_To_Match
:= Formals_To_Match
- 1;
20584 Next_Formal
(Formal
);
20587 if Formals_To_Match
= 0 and then Actuals_To_Match
= 0 then
20594 -- Find some superfluous named actual that did not get
20595 -- attached to the list of associations.
20597 Actual
:= First
(Actuals
);
20598 while Present
(Actual
) loop
20599 if Nkind
(Actual
) = N_Parameter_Association
20600 and then Actual
/= Last
20601 and then No
(Next_Named_Actual
(Actual
))
20603 -- A validity check may introduce a copy of a call that
20604 -- includes an extra actual (for example for an unrelated
20605 -- accessibility check). Check that the extra actual matches
20606 -- some extra formal, which must exist already because
20607 -- subprogram must be frozen at this point.
20609 if Present
(Extra_Formals
(S
))
20610 and then not Comes_From_Source
(Actual
)
20611 and then Nkind
(Actual
) = N_Parameter_Association
20612 and then Chars
(Extra_Formals
(S
)) =
20613 Chars
(Selector_Name
(Actual
))
20618 ("unmatched actual & in call", Selector_Name
(Actual
));
20630 end Normalize_Actuals
;
20632 --------------------------------
20633 -- Note_Possible_Modification --
20634 --------------------------------
20636 procedure Note_Possible_Modification
(N
: Node_Id
; Sure
: Boolean) is
20637 Modification_Comes_From_Source
: constant Boolean :=
20638 Comes_From_Source
(Parent
(N
));
20644 -- Loop to find referenced entity, if there is one
20650 if Is_Entity_Name
(Exp
) then
20651 Ent
:= Entity
(Exp
);
20653 -- If the entity is missing, it is an undeclared identifier,
20654 -- and there is nothing to annotate.
20660 elsif Nkind
(Exp
) = N_Explicit_Dereference
then
20662 P
: constant Node_Id
:= Prefix
(Exp
);
20665 -- In formal verification mode, keep track of all reads and
20666 -- writes through explicit dereferences.
20668 if GNATprove_Mode
then
20669 SPARK_Specific
.Generate_Dereference
(N
, 'm');
20672 if Nkind
(P
) = N_Selected_Component
20673 and then Present
(Entry_Formal
(Entity
(Selector_Name
(P
))))
20675 -- Case of a reference to an entry formal
20677 Ent
:= Entry_Formal
(Entity
(Selector_Name
(P
)));
20679 elsif Nkind
(P
) = N_Identifier
20680 and then Nkind
(Parent
(Entity
(P
))) = N_Object_Declaration
20681 and then Present
(Expression
(Parent
(Entity
(P
))))
20682 and then Nkind
(Expression
(Parent
(Entity
(P
)))) =
20685 -- Case of a reference to a value on which side effects have
20688 Exp
:= Prefix
(Expression
(Parent
(Entity
(P
))));
20696 elsif Nkind_In
(Exp
, N_Type_Conversion
,
20697 N_Unchecked_Type_Conversion
)
20699 Exp
:= Expression
(Exp
);
20702 elsif Nkind_In
(Exp
, N_Slice
,
20703 N_Indexed_Component
,
20704 N_Selected_Component
)
20706 -- Special check, if the prefix is an access type, then return
20707 -- since we are modifying the thing pointed to, not the prefix.
20708 -- When we are expanding, most usually the prefix is replaced
20709 -- by an explicit dereference, and this test is not needed, but
20710 -- in some cases (notably -gnatc mode and generics) when we do
20711 -- not do full expansion, we need this special test.
20713 if Is_Access_Type
(Etype
(Prefix
(Exp
))) then
20716 -- Otherwise go to prefix and keep going
20719 Exp
:= Prefix
(Exp
);
20723 -- All other cases, not a modification
20729 -- Now look for entity being referenced
20731 if Present
(Ent
) then
20732 if Is_Object
(Ent
) then
20733 if Comes_From_Source
(Exp
)
20734 or else Modification_Comes_From_Source
20736 -- Give warning if pragma unmodified is given and we are
20737 -- sure this is a modification.
20739 if Has_Pragma_Unmodified
(Ent
) and then Sure
then
20741 -- Note that the entity may be present only as a result
20742 -- of pragma Unused.
20744 if Has_Pragma_Unused
(Ent
) then
20745 Error_Msg_NE
("??pragma Unused given for &!", N
, Ent
);
20748 ("??pragma Unmodified given for &!", N
, Ent
);
20752 Set_Never_Set_In_Source
(Ent
, False);
20755 Set_Is_True_Constant
(Ent
, False);
20756 Set_Current_Value
(Ent
, Empty
);
20757 Set_Is_Known_Null
(Ent
, False);
20759 if not Can_Never_Be_Null
(Ent
) then
20760 Set_Is_Known_Non_Null
(Ent
, False);
20763 -- Follow renaming chain
20765 if (Ekind
(Ent
) = E_Variable
or else Ekind
(Ent
) = E_Constant
)
20766 and then Present
(Renamed_Object
(Ent
))
20768 Exp
:= Renamed_Object
(Ent
);
20770 -- If the entity is the loop variable in an iteration over
20771 -- a container, retrieve container expression to indicate
20772 -- possible modification.
20774 if Present
(Related_Expression
(Ent
))
20775 and then Nkind
(Parent
(Related_Expression
(Ent
))) =
20776 N_Iterator_Specification
20778 Exp
:= Original_Node
(Related_Expression
(Ent
));
20783 -- The expression may be the renaming of a subcomponent of an
20784 -- array or container. The assignment to the subcomponent is
20785 -- a modification of the container.
20787 elsif Comes_From_Source
(Original_Node
(Exp
))
20788 and then Nkind_In
(Original_Node
(Exp
), N_Selected_Component
,
20789 N_Indexed_Component
)
20791 Exp
:= Prefix
(Original_Node
(Exp
));
20795 -- Generate a reference only if the assignment comes from
20796 -- source. This excludes, for example, calls to a dispatching
20797 -- assignment operation when the left-hand side is tagged. In
20798 -- GNATprove mode, we need those references also on generated
20799 -- code, as these are used to compute the local effects of
20802 if Modification_Comes_From_Source
or GNATprove_Mode
then
20803 Generate_Reference
(Ent
, Exp
, 'm');
20805 -- If the target of the assignment is the bound variable
20806 -- in an iterator, indicate that the corresponding array
20807 -- or container is also modified.
20809 if Ada_Version
>= Ada_2012
20810 and then Nkind
(Parent
(Ent
)) = N_Iterator_Specification
20813 Domain
: constant Node_Id
:= Name
(Parent
(Ent
));
20816 -- TBD : in the full version of the construct, the
20817 -- domain of iteration can be given by an expression.
20819 if Is_Entity_Name
(Domain
) then
20820 Generate_Reference
(Entity
(Domain
), Exp
, 'm');
20821 Set_Is_True_Constant
(Entity
(Domain
), False);
20822 Set_Never_Set_In_Source
(Entity
(Domain
), False);
20831 -- If we are sure this is a modification from source, and we know
20832 -- this modifies a constant, then give an appropriate warning.
20835 and then Modification_Comes_From_Source
20836 and then Overlays_Constant
(Ent
)
20837 and then Address_Clause_Overlay_Warnings
20840 Addr
: constant Node_Id
:= Address_Clause
(Ent
);
20845 Find_Overlaid_Entity
(Addr
, O_Ent
, Off
);
20847 Error_Msg_Sloc
:= Sloc
(Addr
);
20849 ("??constant& may be modified via address clause#",
20860 end Note_Possible_Modification
;
20866 function Null_Status
(N
: Node_Id
) return Null_Status_Kind
is
20867 function Is_Null_Excluding_Def
(Def
: Node_Id
) return Boolean;
20868 -- Determine whether definition Def carries a null exclusion
20870 function Null_Status_Of_Entity
(Id
: Entity_Id
) return Null_Status_Kind
;
20871 -- Determine the null status of arbitrary entity Id
20873 function Null_Status_Of_Type
(Typ
: Entity_Id
) return Null_Status_Kind
;
20874 -- Determine the null status of type Typ
20876 ---------------------------
20877 -- Is_Null_Excluding_Def --
20878 ---------------------------
20880 function Is_Null_Excluding_Def
(Def
: Node_Id
) return Boolean is
20883 Nkind_In
(Def
, N_Access_Definition
,
20884 N_Access_Function_Definition
,
20885 N_Access_Procedure_Definition
,
20886 N_Access_To_Object_Definition
,
20887 N_Component_Definition
,
20888 N_Derived_Type_Definition
)
20889 and then Null_Exclusion_Present
(Def
);
20890 end Is_Null_Excluding_Def
;
20892 ---------------------------
20893 -- Null_Status_Of_Entity --
20894 ---------------------------
20896 function Null_Status_Of_Entity
20897 (Id
: Entity_Id
) return Null_Status_Kind
20899 Decl
: constant Node_Id
:= Declaration_Node
(Id
);
20903 -- The value of an imported or exported entity may be set externally
20904 -- regardless of a null exclusion. As a result, the value cannot be
20905 -- determined statically.
20907 if Is_Imported
(Id
) or else Is_Exported
(Id
) then
20910 elsif Nkind_In
(Decl
, N_Component_Declaration
,
20911 N_Discriminant_Specification
,
20912 N_Formal_Object_Declaration
,
20913 N_Object_Declaration
,
20914 N_Object_Renaming_Declaration
,
20915 N_Parameter_Specification
)
20917 -- A component declaration yields a non-null value when either
20918 -- its component definition or access definition carries a null
20921 if Nkind
(Decl
) = N_Component_Declaration
then
20922 Def
:= Component_Definition
(Decl
);
20924 if Is_Null_Excluding_Def
(Def
) then
20925 return Is_Non_Null
;
20928 Def
:= Access_Definition
(Def
);
20930 if Present
(Def
) and then Is_Null_Excluding_Def
(Def
) then
20931 return Is_Non_Null
;
20934 -- A formal object declaration yields a non-null value if its
20935 -- access definition carries a null exclusion. If the object is
20936 -- default initialized, then the value depends on the expression.
20938 elsif Nkind
(Decl
) = N_Formal_Object_Declaration
then
20939 Def
:= Access_Definition
(Decl
);
20941 if Present
(Def
) and then Is_Null_Excluding_Def
(Def
) then
20942 return Is_Non_Null
;
20945 -- A constant may yield a null or non-null value depending on its
20946 -- initialization expression.
20948 elsif Ekind
(Id
) = E_Constant
then
20949 return Null_Status
(Constant_Value
(Id
));
20951 -- The construct yields a non-null value when it has a null
20954 elsif Null_Exclusion_Present
(Decl
) then
20955 return Is_Non_Null
;
20957 -- An object renaming declaration yields a non-null value if its
20958 -- access definition carries a null exclusion. Otherwise the value
20959 -- depends on the renamed name.
20961 elsif Nkind
(Decl
) = N_Object_Renaming_Declaration
then
20962 Def
:= Access_Definition
(Decl
);
20964 if Present
(Def
) and then Is_Null_Excluding_Def
(Def
) then
20965 return Is_Non_Null
;
20968 return Null_Status
(Name
(Decl
));
20973 -- At this point the declaration of the entity does not carry a null
20974 -- exclusion and lacks an initialization expression. Check the status
20977 return Null_Status_Of_Type
(Etype
(Id
));
20978 end Null_Status_Of_Entity
;
20980 -------------------------
20981 -- Null_Status_Of_Type --
20982 -------------------------
20984 function Null_Status_Of_Type
(Typ
: Entity_Id
) return Null_Status_Kind
is
20989 -- Traverse the type chain looking for types with null exclusion
20992 while Present
(Curr
) and then Etype
(Curr
) /= Curr
loop
20993 Decl
:= Parent
(Curr
);
20995 -- Guard against itypes which do not always have declarations. A
20996 -- type yields a non-null value if it carries a null exclusion.
20998 if Present
(Decl
) then
20999 if Nkind
(Decl
) = N_Full_Type_Declaration
21000 and then Is_Null_Excluding_Def
(Type_Definition
(Decl
))
21002 return Is_Non_Null
;
21004 elsif Nkind
(Decl
) = N_Subtype_Declaration
21005 and then Null_Exclusion_Present
(Decl
)
21007 return Is_Non_Null
;
21011 Curr
:= Etype
(Curr
);
21014 -- The type chain does not contain any null excluding types
21017 end Null_Status_Of_Type
;
21019 -- Start of processing for Null_Status
21022 -- An allocator always creates a non-null value
21024 if Nkind
(N
) = N_Allocator
then
21025 return Is_Non_Null
;
21027 -- Taking the 'Access of something yields a non-null value
21029 elsif Nkind
(N
) = N_Attribute_Reference
21030 and then Nam_In
(Attribute_Name
(N
), Name_Access
,
21031 Name_Unchecked_Access
,
21032 Name_Unrestricted_Access
)
21034 return Is_Non_Null
;
21036 -- "null" yields null
21038 elsif Nkind
(N
) = N_Null
then
21041 -- Check the status of the operand of a type conversion
21043 elsif Nkind
(N
) = N_Type_Conversion
then
21044 return Null_Status
(Expression
(N
));
21046 -- The input denotes a reference to an entity. Determine whether the
21047 -- entity or its type yields a null or non-null value.
21049 elsif Is_Entity_Name
(N
) and then Present
(Entity
(N
)) then
21050 return Null_Status_Of_Entity
(Entity
(N
));
21053 -- Otherwise it is not possible to determine the null status of the
21054 -- subexpression at compile time without resorting to simple flow
21060 --------------------------------------
21061 -- Null_To_Null_Address_Convert_OK --
21062 --------------------------------------
21064 function Null_To_Null_Address_Convert_OK
21066 Typ
: Entity_Id
:= Empty
) return Boolean
21069 if not Relaxed_RM_Semantics
then
21073 if Nkind
(N
) = N_Null
then
21074 return Present
(Typ
) and then Is_Descendant_Of_Address
(Typ
);
21076 elsif Nkind_In
(N
, N_Op_Eq
, N_Op_Ge
, N_Op_Gt
, N_Op_Le
, N_Op_Lt
, N_Op_Ne
)
21079 L
: constant Node_Id
:= Left_Opnd
(N
);
21080 R
: constant Node_Id
:= Right_Opnd
(N
);
21083 -- We check the Etype of the complementary operand since the
21084 -- N_Null node is not decorated at this stage.
21087 ((Nkind
(L
) = N_Null
21088 and then Is_Descendant_Of_Address
(Etype
(R
)))
21090 (Nkind
(R
) = N_Null
21091 and then Is_Descendant_Of_Address
(Etype
(L
))));
21096 end Null_To_Null_Address_Convert_OK
;
21098 ---------------------------------
21099 -- Number_Of_Elements_In_Array --
21100 ---------------------------------
21102 function Number_Of_Elements_In_Array
(T
: Entity_Id
) return Int
is
21110 pragma Assert
(Is_Array_Type
(T
));
21112 Indx
:= First_Index
(T
);
21113 while Present
(Indx
) loop
21114 Typ
:= Underlying_Type
(Etype
(Indx
));
21116 -- Never look at junk bounds of a generic type
21118 if Is_Generic_Type
(Typ
) then
21122 -- Check the array bounds are known at compile time and return zero
21123 -- if they are not.
21125 Low
:= Type_Low_Bound
(Typ
);
21126 High
:= Type_High_Bound
(Typ
);
21128 if not Compile_Time_Known_Value
(Low
) then
21130 elsif not Compile_Time_Known_Value
(High
) then
21134 Num
* UI_To_Int
((Expr_Value
(High
) - Expr_Value
(Low
) + 1));
21141 end Number_Of_Elements_In_Array
;
21143 -------------------------
21144 -- Object_Access_Level --
21145 -------------------------
21147 -- Returns the static accessibility level of the view denoted by Obj. Note
21148 -- that the value returned is the result of a call to Scope_Depth. Only
21149 -- scope depths associated with dynamic scopes can actually be returned.
21150 -- Since only relative levels matter for accessibility checking, the fact
21151 -- that the distance between successive levels of accessibility is not
21152 -- always one is immaterial (invariant: if level(E2) is deeper than
21153 -- level(E1), then Scope_Depth(E1) < Scope_Depth(E2)).
21155 function Object_Access_Level
(Obj
: Node_Id
) return Uint
is
21156 function Is_Interface_Conversion
(N
: Node_Id
) return Boolean;
21157 -- Determine whether N is a construct of the form
21158 -- Some_Type (Operand._tag'Address)
21159 -- This construct appears in the context of dispatching calls.
21161 function Reference_To
(Obj
: Node_Id
) return Node_Id
;
21162 -- An explicit dereference is created when removing side effects from
21163 -- expressions for constraint checking purposes. In this case a local
21164 -- access type is created for it. The correct access level is that of
21165 -- the original source node. We detect this case by noting that the
21166 -- prefix of the dereference is created by an object declaration whose
21167 -- initial expression is a reference.
21169 -----------------------------
21170 -- Is_Interface_Conversion --
21171 -----------------------------
21173 function Is_Interface_Conversion
(N
: Node_Id
) return Boolean is
21175 return Nkind
(N
) = N_Unchecked_Type_Conversion
21176 and then Nkind
(Expression
(N
)) = N_Attribute_Reference
21177 and then Attribute_Name
(Expression
(N
)) = Name_Address
;
21178 end Is_Interface_Conversion
;
21184 function Reference_To
(Obj
: Node_Id
) return Node_Id
is
21185 Pref
: constant Node_Id
:= Prefix
(Obj
);
21187 if Is_Entity_Name
(Pref
)
21188 and then Nkind
(Parent
(Entity
(Pref
))) = N_Object_Declaration
21189 and then Present
(Expression
(Parent
(Entity
(Pref
))))
21190 and then Nkind
(Expression
(Parent
(Entity
(Pref
)))) = N_Reference
21192 return (Prefix
(Expression
(Parent
(Entity
(Pref
)))));
21202 -- Start of processing for Object_Access_Level
21205 if Nkind
(Obj
) = N_Defining_Identifier
21206 or else Is_Entity_Name
(Obj
)
21208 if Nkind
(Obj
) = N_Defining_Identifier
then
21214 if Is_Prival
(E
) then
21215 E
:= Prival_Link
(E
);
21218 -- If E is a type then it denotes a current instance. For this case
21219 -- we add one to the normal accessibility level of the type to ensure
21220 -- that current instances are treated as always being deeper than
21221 -- than the level of any visible named access type (see 3.10.2(21)).
21223 if Is_Type
(E
) then
21224 return Type_Access_Level
(E
) + 1;
21226 elsif Present
(Renamed_Object
(E
)) then
21227 return Object_Access_Level
(Renamed_Object
(E
));
21229 -- Similarly, if E is a component of the current instance of a
21230 -- protected type, any instance of it is assumed to be at a deeper
21231 -- level than the type. For a protected object (whose type is an
21232 -- anonymous protected type) its components are at the same level
21233 -- as the type itself.
21235 elsif not Is_Overloadable
(E
)
21236 and then Ekind
(Scope
(E
)) = E_Protected_Type
21237 and then Comes_From_Source
(Scope
(E
))
21239 return Type_Access_Level
(Scope
(E
)) + 1;
21242 -- Aliased formals of functions take their access level from the
21243 -- point of call, i.e. require a dynamic check. For static check
21244 -- purposes, this is smaller than the level of the subprogram
21245 -- itself. For procedures the aliased makes no difference.
21248 and then Is_Aliased
(E
)
21249 and then Ekind
(Scope
(E
)) = E_Function
21251 return Type_Access_Level
(Etype
(E
));
21254 return Scope_Depth
(Enclosing_Dynamic_Scope
(E
));
21258 elsif Nkind_In
(Obj
, N_Indexed_Component
, N_Selected_Component
) then
21259 if Is_Access_Type
(Etype
(Prefix
(Obj
))) then
21260 return Type_Access_Level
(Etype
(Prefix
(Obj
)));
21262 return Object_Access_Level
(Prefix
(Obj
));
21265 elsif Nkind
(Obj
) = N_Explicit_Dereference
then
21267 -- If the prefix is a selected access discriminant then we make a
21268 -- recursive call on the prefix, which will in turn check the level
21269 -- of the prefix object of the selected discriminant.
21271 -- In Ada 2012, if the discriminant has implicit dereference and
21272 -- the context is a selected component, treat this as an object of
21273 -- unknown scope (see below). This is necessary in compile-only mode;
21274 -- otherwise expansion will already have transformed the prefix into
21277 if Nkind
(Prefix
(Obj
)) = N_Selected_Component
21278 and then Ekind
(Etype
(Prefix
(Obj
))) = E_Anonymous_Access_Type
21280 Ekind
(Entity
(Selector_Name
(Prefix
(Obj
)))) = E_Discriminant
21282 (not Has_Implicit_Dereference
21283 (Entity
(Selector_Name
(Prefix
(Obj
))))
21284 or else Nkind
(Parent
(Obj
)) /= N_Selected_Component
)
21286 return Object_Access_Level
(Prefix
(Obj
));
21288 -- Detect an interface conversion in the context of a dispatching
21289 -- call. Use the original form of the conversion to find the access
21290 -- level of the operand.
21292 elsif Is_Interface
(Etype
(Obj
))
21293 and then Is_Interface_Conversion
(Prefix
(Obj
))
21294 and then Nkind
(Original_Node
(Obj
)) = N_Type_Conversion
21296 return Object_Access_Level
(Original_Node
(Obj
));
21298 elsif not Comes_From_Source
(Obj
) then
21300 Ref
: constant Node_Id
:= Reference_To
(Obj
);
21302 if Present
(Ref
) then
21303 return Object_Access_Level
(Ref
);
21305 return Type_Access_Level
(Etype
(Prefix
(Obj
)));
21310 return Type_Access_Level
(Etype
(Prefix
(Obj
)));
21313 elsif Nkind_In
(Obj
, N_Type_Conversion
, N_Unchecked_Type_Conversion
) then
21314 return Object_Access_Level
(Expression
(Obj
));
21316 elsif Nkind
(Obj
) = N_Function_Call
then
21318 -- Function results are objects, so we get either the access level of
21319 -- the function or, in the case of an indirect call, the level of the
21320 -- access-to-subprogram type. (This code is used for Ada 95, but it
21321 -- looks wrong, because it seems that we should be checking the level
21322 -- of the call itself, even for Ada 95. However, using the Ada 2005
21323 -- version of the code causes regressions in several tests that are
21324 -- compiled with -gnat95. ???)
21326 if Ada_Version
< Ada_2005
then
21327 if Is_Entity_Name
(Name
(Obj
)) then
21328 return Subprogram_Access_Level
(Entity
(Name
(Obj
)));
21330 return Type_Access_Level
(Etype
(Prefix
(Name
(Obj
))));
21333 -- For Ada 2005, the level of the result object of a function call is
21334 -- defined to be the level of the call's innermost enclosing master.
21335 -- We determine that by querying the depth of the innermost enclosing
21339 Return_Master_Scope_Depth_Of_Call
: declare
21340 function Innermost_Master_Scope_Depth
21341 (N
: Node_Id
) return Uint
;
21342 -- Returns the scope depth of the given node's innermost
21343 -- enclosing dynamic scope (effectively the accessibility
21344 -- level of the innermost enclosing master).
21346 ----------------------------------
21347 -- Innermost_Master_Scope_Depth --
21348 ----------------------------------
21350 function Innermost_Master_Scope_Depth
21351 (N
: Node_Id
) return Uint
21353 Node_Par
: Node_Id
:= Parent
(N
);
21356 -- Locate the nearest enclosing node (by traversing Parents)
21357 -- that Defining_Entity can be applied to, and return the
21358 -- depth of that entity's nearest enclosing dynamic scope.
21360 while Present
(Node_Par
) loop
21361 case Nkind
(Node_Par
) is
21362 when N_Abstract_Subprogram_Declaration
21363 | N_Block_Statement
21365 | N_Component_Declaration
21367 | N_Entry_Declaration
21368 | N_Exception_Declaration
21369 | N_Formal_Object_Declaration
21370 | N_Formal_Package_Declaration
21371 | N_Formal_Subprogram_Declaration
21372 | N_Formal_Type_Declaration
21373 | N_Full_Type_Declaration
21374 | N_Function_Specification
21375 | N_Generic_Declaration
21376 | N_Generic_Instantiation
21377 | N_Implicit_Label_Declaration
21378 | N_Incomplete_Type_Declaration
21379 | N_Loop_Parameter_Specification
21380 | N_Number_Declaration
21381 | N_Object_Declaration
21382 | N_Package_Declaration
21383 | N_Package_Specification
21384 | N_Parameter_Specification
21385 | N_Private_Extension_Declaration
21386 | N_Private_Type_Declaration
21387 | N_Procedure_Specification
21389 | N_Protected_Type_Declaration
21390 | N_Renaming_Declaration
21391 | N_Single_Protected_Declaration
21392 | N_Single_Task_Declaration
21393 | N_Subprogram_Declaration
21394 | N_Subtype_Declaration
21396 | N_Task_Type_Declaration
21399 (Nearest_Dynamic_Scope
21400 (Defining_Entity
(Node_Par
)));
21402 -- For a return statement within a function, return
21403 -- the depth of the function itself. This is not just
21404 -- a small optimization, but matters when analyzing
21405 -- the expression in an expression function before
21406 -- the body is created.
21408 when N_Simple_Return_Statement
=>
21409 if Ekind
(Current_Scope
) = E_Function
then
21410 return Scope_Depth
(Current_Scope
);
21417 Node_Par
:= Parent
(Node_Par
);
21420 pragma Assert
(False);
21422 -- Should never reach the following return
21424 return Scope_Depth
(Current_Scope
) + 1;
21425 end Innermost_Master_Scope_Depth
;
21427 -- Start of processing for Return_Master_Scope_Depth_Of_Call
21430 return Innermost_Master_Scope_Depth
(Obj
);
21431 end Return_Master_Scope_Depth_Of_Call
;
21434 -- For convenience we handle qualified expressions, even though they
21435 -- aren't technically object names.
21437 elsif Nkind
(Obj
) = N_Qualified_Expression
then
21438 return Object_Access_Level
(Expression
(Obj
));
21440 -- Ditto for aggregates. They have the level of the temporary that
21441 -- will hold their value.
21443 elsif Nkind
(Obj
) = N_Aggregate
then
21444 return Object_Access_Level
(Current_Scope
);
21446 -- Otherwise return the scope level of Standard. (If there are cases
21447 -- that fall through to this point they will be treated as having
21448 -- global accessibility for now. ???)
21451 return Scope_Depth
(Standard_Standard
);
21453 end Object_Access_Level
;
21455 ----------------------------------
21456 -- Old_Requires_Transient_Scope --
21457 ----------------------------------
21459 function Old_Requires_Transient_Scope
(Id
: Entity_Id
) return Boolean is
21460 Typ
: constant Entity_Id
:= Underlying_Type
(Id
);
21463 -- This is a private type which is not completed yet. This can only
21464 -- happen in a default expression (of a formal parameter or of a
21465 -- record component). Do not expand transient scope in this case.
21470 -- Do not expand transient scope for non-existent procedure return
21472 elsif Typ
= Standard_Void_Type
then
21475 -- Elementary types do not require a transient scope
21477 elsif Is_Elementary_Type
(Typ
) then
21480 -- Generally, indefinite subtypes require a transient scope, since the
21481 -- back end cannot generate temporaries, since this is not a valid type
21482 -- for declaring an object. It might be possible to relax this in the
21483 -- future, e.g. by declaring the maximum possible space for the type.
21485 elsif not Is_Definite_Subtype
(Typ
) then
21488 -- Functions returning tagged types may dispatch on result so their
21489 -- returned value is allocated on the secondary stack. Controlled
21490 -- type temporaries need finalization.
21492 elsif Is_Tagged_Type
(Typ
) or else Has_Controlled_Component
(Typ
) then
21497 elsif Is_Record_Type
(Typ
) then
21502 Comp
:= First_Entity
(Typ
);
21503 while Present
(Comp
) loop
21504 if Ekind
(Comp
) = E_Component
then
21506 -- ???It's not clear we need a full recursive call to
21507 -- Old_Requires_Transient_Scope here. Note that the
21508 -- following can't happen.
21510 pragma Assert
(Is_Definite_Subtype
(Etype
(Comp
)));
21511 pragma Assert
(not Has_Controlled_Component
(Etype
(Comp
)));
21513 if Old_Requires_Transient_Scope
(Etype
(Comp
)) then
21518 Next_Entity
(Comp
);
21524 -- String literal types never require transient scope
21526 elsif Ekind
(Typ
) = E_String_Literal_Subtype
then
21529 -- Array type. Note that we already know that this is a constrained
21530 -- array, since unconstrained arrays will fail the indefinite test.
21532 elsif Is_Array_Type
(Typ
) then
21534 -- If component type requires a transient scope, the array does too
21536 if Old_Requires_Transient_Scope
(Component_Type
(Typ
)) then
21539 -- Otherwise, we only need a transient scope if the size depends on
21540 -- the value of one or more discriminants.
21543 return Size_Depends_On_Discriminant
(Typ
);
21546 -- All other cases do not require a transient scope
21549 pragma Assert
(Is_Protected_Type
(Typ
) or else Is_Task_Type
(Typ
));
21552 end Old_Requires_Transient_Scope
;
21554 ---------------------------------
21555 -- Original_Aspect_Pragma_Name --
21556 ---------------------------------
21558 function Original_Aspect_Pragma_Name
(N
: Node_Id
) return Name_Id
is
21560 Item_Nam
: Name_Id
;
21563 pragma Assert
(Nkind_In
(N
, N_Aspect_Specification
, N_Pragma
));
21567 -- The pragma was generated to emulate an aspect, use the original
21568 -- aspect specification.
21570 if Nkind
(Item
) = N_Pragma
and then From_Aspect_Specification
(Item
) then
21571 Item
:= Corresponding_Aspect
(Item
);
21574 -- Retrieve the name of the aspect/pragma. Note that Pre, Pre_Class,
21575 -- Post and Post_Class rewrite their pragma identifier to preserve the
21577 -- ??? this is kludgey
21579 if Nkind
(Item
) = N_Pragma
then
21580 Item_Nam
:= Chars
(Original_Node
(Pragma_Identifier
(Item
)));
21583 pragma Assert
(Nkind
(Item
) = N_Aspect_Specification
);
21584 Item_Nam
:= Chars
(Identifier
(Item
));
21587 -- Deal with 'Class by converting the name to its _XXX form
21589 if Class_Present
(Item
) then
21590 if Item_Nam
= Name_Invariant
then
21591 Item_Nam
:= Name_uInvariant
;
21593 elsif Item_Nam
= Name_Post
then
21594 Item_Nam
:= Name_uPost
;
21596 elsif Item_Nam
= Name_Pre
then
21597 Item_Nam
:= Name_uPre
;
21599 elsif Nam_In
(Item_Nam
, Name_Type_Invariant
,
21600 Name_Type_Invariant_Class
)
21602 Item_Nam
:= Name_uType_Invariant
;
21604 -- Nothing to do for other cases (e.g. a Check that derived from
21605 -- Pre_Class and has the flag set). Also we do nothing if the name
21606 -- is already in special _xxx form.
21612 end Original_Aspect_Pragma_Name
;
21614 --------------------------------------
21615 -- Original_Corresponding_Operation --
21616 --------------------------------------
21618 function Original_Corresponding_Operation
(S
: Entity_Id
) return Entity_Id
21620 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(S
);
21623 -- If S is an inherited primitive S2 the original corresponding
21624 -- operation of S is the original corresponding operation of S2
21626 if Present
(Alias
(S
))
21627 and then Find_Dispatching_Type
(Alias
(S
)) /= Typ
21629 return Original_Corresponding_Operation
(Alias
(S
));
21631 -- If S overrides an inherited subprogram S2 the original corresponding
21632 -- operation of S is the original corresponding operation of S2
21634 elsif Present
(Overridden_Operation
(S
)) then
21635 return Original_Corresponding_Operation
(Overridden_Operation
(S
));
21637 -- otherwise it is S itself
21642 end Original_Corresponding_Operation
;
21644 -------------------
21645 -- Output_Entity --
21646 -------------------
21648 procedure Output_Entity
(Id
: Entity_Id
) is
21652 Scop
:= Scope
(Id
);
21654 -- The entity may lack a scope when it is in the process of being
21655 -- analyzed. Use the current scope as an approximation.
21658 Scop
:= Current_Scope
;
21661 Output_Name
(Chars
(Id
), Scop
);
21668 procedure Output_Name
(Nam
: Name_Id
; Scop
: Entity_Id
:= Current_Scope
) is
21672 (Get_Qualified_Name
21679 ----------------------
21680 -- Policy_In_Effect --
21681 ----------------------
21683 function Policy_In_Effect
(Policy
: Name_Id
) return Name_Id
is
21684 function Policy_In_List
(List
: Node_Id
) return Name_Id
;
21685 -- Determine the mode of a policy in a N_Pragma list
21687 --------------------
21688 -- Policy_In_List --
21689 --------------------
21691 function Policy_In_List
(List
: Node_Id
) return Name_Id
is
21698 while Present
(Prag
) loop
21699 Arg1
:= First
(Pragma_Argument_Associations
(Prag
));
21700 Arg2
:= Next
(Arg1
);
21702 Arg1
:= Get_Pragma_Arg
(Arg1
);
21703 Arg2
:= Get_Pragma_Arg
(Arg2
);
21705 -- The current Check_Policy pragma matches the requested policy or
21706 -- appears in the single argument form (Assertion, policy_id).
21708 if Nam_In
(Chars
(Arg1
), Name_Assertion
, Policy
) then
21709 return Chars
(Arg2
);
21712 Prag
:= Next_Pragma
(Prag
);
21716 end Policy_In_List
;
21722 -- Start of processing for Policy_In_Effect
21725 if not Is_Valid_Assertion_Kind
(Policy
) then
21726 raise Program_Error
;
21729 -- Inspect all policy pragmas that appear within scopes (if any)
21731 Kind
:= Policy_In_List
(Check_Policy_List
);
21733 -- Inspect all configuration policy pragmas (if any)
21735 if Kind
= No_Name
then
21736 Kind
:= Policy_In_List
(Check_Policy_List_Config
);
21739 -- The context lacks policy pragmas, determine the mode based on whether
21740 -- assertions are enabled at the configuration level. This ensures that
21741 -- the policy is preserved when analyzing generics.
21743 if Kind
= No_Name
then
21744 if Assertions_Enabled_Config
then
21745 Kind
:= Name_Check
;
21747 Kind
:= Name_Ignore
;
21752 end Policy_In_Effect
;
21754 ----------------------------------
21755 -- Predicate_Tests_On_Arguments --
21756 ----------------------------------
21758 function Predicate_Tests_On_Arguments
(Subp
: Entity_Id
) return Boolean is
21760 -- Always test predicates on indirect call
21762 if Ekind
(Subp
) = E_Subprogram_Type
then
21765 -- Do not test predicates on call to generated default Finalize, since
21766 -- we are not interested in whether something we are finalizing (and
21767 -- typically destroying) satisfies its predicates.
21769 elsif Chars
(Subp
) = Name_Finalize
21770 and then not Comes_From_Source
(Subp
)
21774 -- Do not test predicates on any internally generated routines
21776 elsif Is_Internal_Name
(Chars
(Subp
)) then
21779 -- Do not test predicates on call to Init_Proc, since if needed the
21780 -- predicate test will occur at some other point.
21782 elsif Is_Init_Proc
(Subp
) then
21785 -- Do not test predicates on call to predicate function, since this
21786 -- would cause infinite recursion.
21788 elsif Ekind
(Subp
) = E_Function
21789 and then (Is_Predicate_Function
(Subp
)
21791 Is_Predicate_Function_M
(Subp
))
21795 -- For now, no other exceptions
21800 end Predicate_Tests_On_Arguments
;
21802 -----------------------
21803 -- Private_Component --
21804 -----------------------
21806 function Private_Component
(Type_Id
: Entity_Id
) return Entity_Id
is
21807 Ancestor
: constant Entity_Id
:= Base_Type
(Type_Id
);
21809 function Trace_Components
21811 Check
: Boolean) return Entity_Id
;
21812 -- Recursive function that does the work, and checks against circular
21813 -- definition for each subcomponent type.
21815 ----------------------
21816 -- Trace_Components --
21817 ----------------------
21819 function Trace_Components
21821 Check
: Boolean) return Entity_Id
21823 Btype
: constant Entity_Id
:= Base_Type
(T
);
21824 Component
: Entity_Id
;
21826 Candidate
: Entity_Id
:= Empty
;
21829 if Check
and then Btype
= Ancestor
then
21830 Error_Msg_N
("circular type definition", Type_Id
);
21834 if Is_Private_Type
(Btype
) and then not Is_Generic_Type
(Btype
) then
21835 if Present
(Full_View
(Btype
))
21836 and then Is_Record_Type
(Full_View
(Btype
))
21837 and then not Is_Frozen
(Btype
)
21839 -- To indicate that the ancestor depends on a private type, the
21840 -- current Btype is sufficient. However, to check for circular
21841 -- definition we must recurse on the full view.
21843 Candidate
:= Trace_Components
(Full_View
(Btype
), True);
21845 if Candidate
= Any_Type
then
21855 elsif Is_Array_Type
(Btype
) then
21856 return Trace_Components
(Component_Type
(Btype
), True);
21858 elsif Is_Record_Type
(Btype
) then
21859 Component
:= First_Entity
(Btype
);
21860 while Present
(Component
)
21861 and then Comes_From_Source
(Component
)
21863 -- Skip anonymous types generated by constrained components
21865 if not Is_Type
(Component
) then
21866 P
:= Trace_Components
(Etype
(Component
), True);
21868 if Present
(P
) then
21869 if P
= Any_Type
then
21877 Next_Entity
(Component
);
21885 end Trace_Components
;
21887 -- Start of processing for Private_Component
21890 return Trace_Components
(Type_Id
, False);
21891 end Private_Component
;
21893 ---------------------------
21894 -- Primitive_Names_Match --
21895 ---------------------------
21897 function Primitive_Names_Match
(E1
, E2
: Entity_Id
) return Boolean is
21898 function Non_Internal_Name
(E
: Entity_Id
) return Name_Id
;
21899 -- Given an internal name, returns the corresponding non-internal name
21901 ------------------------
21902 -- Non_Internal_Name --
21903 ------------------------
21905 function Non_Internal_Name
(E
: Entity_Id
) return Name_Id
is
21907 Get_Name_String
(Chars
(E
));
21908 Name_Len
:= Name_Len
- 1;
21910 end Non_Internal_Name
;
21912 -- Start of processing for Primitive_Names_Match
21915 pragma Assert
(Present
(E1
) and then Present
(E2
));
21917 return Chars
(E1
) = Chars
(E2
)
21919 (not Is_Internal_Name
(Chars
(E1
))
21920 and then Is_Internal_Name
(Chars
(E2
))
21921 and then Non_Internal_Name
(E2
) = Chars
(E1
))
21923 (not Is_Internal_Name
(Chars
(E2
))
21924 and then Is_Internal_Name
(Chars
(E1
))
21925 and then Non_Internal_Name
(E1
) = Chars
(E2
))
21927 (Is_Predefined_Dispatching_Operation
(E1
)
21928 and then Is_Predefined_Dispatching_Operation
(E2
)
21929 and then Same_TSS
(E1
, E2
))
21931 (Is_Init_Proc
(E1
) and then Is_Init_Proc
(E2
));
21932 end Primitive_Names_Match
;
21934 -----------------------
21935 -- Process_End_Label --
21936 -----------------------
21938 procedure Process_End_Label
21947 Label_Ref
: Boolean;
21948 -- Set True if reference to end label itself is required
21951 -- Gets set to the operator symbol or identifier that references the
21952 -- entity Ent. For the child unit case, this is the identifier from the
21953 -- designator. For other cases, this is simply Endl.
21955 procedure Generate_Parent_Ref
(N
: Node_Id
; E
: Entity_Id
);
21956 -- N is an identifier node that appears as a parent unit reference in
21957 -- the case where Ent is a child unit. This procedure generates an
21958 -- appropriate cross-reference entry. E is the corresponding entity.
21960 -------------------------
21961 -- Generate_Parent_Ref --
21962 -------------------------
21964 procedure Generate_Parent_Ref
(N
: Node_Id
; E
: Entity_Id
) is
21966 -- If names do not match, something weird, skip reference
21968 if Chars
(E
) = Chars
(N
) then
21970 -- Generate the reference. We do NOT consider this as a reference
21971 -- for unreferenced symbol purposes.
21973 Generate_Reference
(E
, N
, 'r', Set_Ref
=> False, Force
=> True);
21975 if Style_Check
then
21976 Style
.Check_Identifier
(N
, E
);
21979 end Generate_Parent_Ref
;
21981 -- Start of processing for Process_End_Label
21984 -- If no node, ignore. This happens in some error situations, and
21985 -- also for some internally generated structures where no end label
21986 -- references are required in any case.
21992 -- Nothing to do if no End_Label, happens for internally generated
21993 -- constructs where we don't want an end label reference anyway. Also
21994 -- nothing to do if Endl is a string literal, which means there was
21995 -- some prior error (bad operator symbol)
21997 Endl
:= End_Label
(N
);
21999 if No
(Endl
) or else Nkind
(Endl
) = N_String_Literal
then
22003 -- Reference node is not in extended main source unit
22005 if not In_Extended_Main_Source_Unit
(N
) then
22007 -- Generally we do not collect references except for the extended
22008 -- main source unit. The one exception is the 'e' entry for a
22009 -- package spec, where it is useful for a client to have the
22010 -- ending information to define scopes.
22016 Label_Ref
:= False;
22018 -- For this case, we can ignore any parent references, but we
22019 -- need the package name itself for the 'e' entry.
22021 if Nkind
(Endl
) = N_Designator
then
22022 Endl
:= Identifier
(Endl
);
22026 -- Reference is in extended main source unit
22031 -- For designator, generate references for the parent entries
22033 if Nkind
(Endl
) = N_Designator
then
22035 -- Generate references for the prefix if the END line comes from
22036 -- source (otherwise we do not need these references) We climb the
22037 -- scope stack to find the expected entities.
22039 if Comes_From_Source
(Endl
) then
22040 Nam
:= Name
(Endl
);
22041 Scop
:= Current_Scope
;
22042 while Nkind
(Nam
) = N_Selected_Component
loop
22043 Scop
:= Scope
(Scop
);
22044 exit when No
(Scop
);
22045 Generate_Parent_Ref
(Selector_Name
(Nam
), Scop
);
22046 Nam
:= Prefix
(Nam
);
22049 if Present
(Scop
) then
22050 Generate_Parent_Ref
(Nam
, Scope
(Scop
));
22054 Endl
:= Identifier
(Endl
);
22058 -- If the end label is not for the given entity, then either we have
22059 -- some previous error, or this is a generic instantiation for which
22060 -- we do not need to make a cross-reference in this case anyway. In
22061 -- either case we simply ignore the call.
22063 if Chars
(Ent
) /= Chars
(Endl
) then
22067 -- If label was really there, then generate a normal reference and then
22068 -- adjust the location in the end label to point past the name (which
22069 -- should almost always be the semicolon).
22071 Loc
:= Sloc
(Endl
);
22073 if Comes_From_Source
(Endl
) then
22075 -- If a label reference is required, then do the style check and
22076 -- generate an l-type cross-reference entry for the label
22079 if Style_Check
then
22080 Style
.Check_Identifier
(Endl
, Ent
);
22083 Generate_Reference
(Ent
, Endl
, 'l', Set_Ref
=> False);
22086 -- Set the location to point past the label (normally this will
22087 -- mean the semicolon immediately following the label). This is
22088 -- done for the sake of the 'e' or 't' entry generated below.
22090 Get_Decoded_Name_String
(Chars
(Endl
));
22091 Set_Sloc
(Endl
, Sloc
(Endl
) + Source_Ptr
(Name_Len
));
22094 -- In SPARK mode, no missing label is allowed for packages and
22095 -- subprogram bodies. Detect those cases by testing whether
22096 -- Process_End_Label was called for a body (Typ = 't') or a package.
22098 if Restriction_Check_Required
(SPARK_05
)
22099 and then (Typ
= 't' or else Ekind
(Ent
) = E_Package
)
22101 Error_Msg_Node_1
:= Endl
;
22102 Check_SPARK_05_Restriction
22103 ("`END &` required", Endl
, Force
=> True);
22107 -- Now generate the e/t reference
22109 Generate_Reference
(Ent
, Endl
, Typ
, Set_Ref
=> False, Force
=> True);
22111 -- Restore Sloc, in case modified above, since we have an identifier
22112 -- and the normal Sloc should be left set in the tree.
22114 Set_Sloc
(Endl
, Loc
);
22115 end Process_End_Label
;
22117 --------------------------------
22118 -- Propagate_Concurrent_Flags --
22119 --------------------------------
22121 procedure Propagate_Concurrent_Flags
22123 Comp_Typ
: Entity_Id
)
22126 if Has_Task
(Comp_Typ
) then
22127 Set_Has_Task
(Typ
);
22130 if Has_Protected
(Comp_Typ
) then
22131 Set_Has_Protected
(Typ
);
22134 if Has_Timing_Event
(Comp_Typ
) then
22135 Set_Has_Timing_Event
(Typ
);
22137 end Propagate_Concurrent_Flags
;
22139 ------------------------------
22140 -- Propagate_DIC_Attributes --
22141 ------------------------------
22143 procedure Propagate_DIC_Attributes
22145 From_Typ
: Entity_Id
)
22147 DIC_Proc
: Entity_Id
;
22150 if Present
(Typ
) and then Present
(From_Typ
) then
22151 pragma Assert
(Is_Type
(Typ
) and then Is_Type
(From_Typ
));
22153 -- Nothing to do if both the source and the destination denote the
22156 if From_Typ
= Typ
then
22160 DIC_Proc
:= DIC_Procedure
(From_Typ
);
22162 -- The setting of the attributes is intentionally conservative. This
22163 -- prevents accidental clobbering of enabled attributes.
22165 if Has_Inherited_DIC
(From_Typ
)
22166 and then not Has_Inherited_DIC
(Typ
)
22168 Set_Has_Inherited_DIC
(Typ
);
22171 if Has_Own_DIC
(From_Typ
) and then not Has_Own_DIC
(Typ
) then
22172 Set_Has_Own_DIC
(Typ
);
22175 if Present
(DIC_Proc
) and then No
(DIC_Procedure
(Typ
)) then
22176 Set_DIC_Procedure
(Typ
, DIC_Proc
);
22179 end Propagate_DIC_Attributes
;
22181 ------------------------------------
22182 -- Propagate_Invariant_Attributes --
22183 ------------------------------------
22185 procedure Propagate_Invariant_Attributes
22187 From_Typ
: Entity_Id
)
22189 Full_IP
: Entity_Id
;
22190 Part_IP
: Entity_Id
;
22193 if Present
(Typ
) and then Present
(From_Typ
) then
22194 pragma Assert
(Is_Type
(Typ
) and then Is_Type
(From_Typ
));
22196 -- Nothing to do if both the source and the destination denote the
22199 if From_Typ
= Typ
then
22203 Full_IP
:= Invariant_Procedure
(From_Typ
);
22204 Part_IP
:= Partial_Invariant_Procedure
(From_Typ
);
22206 -- The setting of the attributes is intentionally conservative. This
22207 -- prevents accidental clobbering of enabled attributes.
22209 if Has_Inheritable_Invariants
(From_Typ
)
22210 and then not Has_Inheritable_Invariants
(Typ
)
22212 Set_Has_Inheritable_Invariants
(Typ
, True);
22215 if Has_Inherited_Invariants
(From_Typ
)
22216 and then not Has_Inherited_Invariants
(Typ
)
22218 Set_Has_Inherited_Invariants
(Typ
, True);
22221 if Has_Own_Invariants
(From_Typ
)
22222 and then not Has_Own_Invariants
(Typ
)
22224 Set_Has_Own_Invariants
(Typ
, True);
22227 if Present
(Full_IP
) and then No
(Invariant_Procedure
(Typ
)) then
22228 Set_Invariant_Procedure
(Typ
, Full_IP
);
22231 if Present
(Part_IP
) and then No
(Partial_Invariant_Procedure
(Typ
))
22233 Set_Partial_Invariant_Procedure
(Typ
, Part_IP
);
22236 end Propagate_Invariant_Attributes
;
22238 ---------------------------------------
22239 -- Record_Possible_Part_Of_Reference --
22240 ---------------------------------------
22242 procedure Record_Possible_Part_Of_Reference
22243 (Var_Id
: Entity_Id
;
22246 Encap
: constant Entity_Id
:= Encapsulating_State
(Var_Id
);
22250 -- The variable is a constituent of a single protected/task type. Such
22251 -- a variable acts as a component of the type and must appear within a
22252 -- specific region (SPARK RM 9(3)). Instead of recording the reference,
22253 -- verify its legality now.
22255 if Present
(Encap
) and then Is_Single_Concurrent_Object
(Encap
) then
22256 Check_Part_Of_Reference
(Var_Id
, Ref
);
22258 -- The variable is subject to pragma Part_Of and may eventually become a
22259 -- constituent of a single protected/task type. Record the reference to
22260 -- verify its placement when the contract of the variable is analyzed.
22262 elsif Present
(Get_Pragma
(Var_Id
, Pragma_Part_Of
)) then
22263 Refs
:= Part_Of_References
(Var_Id
);
22266 Refs
:= New_Elmt_List
;
22267 Set_Part_Of_References
(Var_Id
, Refs
);
22270 Append_Elmt
(Ref
, Refs
);
22272 end Record_Possible_Part_Of_Reference
;
22278 function Referenced
(Id
: Entity_Id
; Expr
: Node_Id
) return Boolean is
22279 Seen
: Boolean := False;
22281 function Is_Reference
(N
: Node_Id
) return Traverse_Result
;
22282 -- Determine whether node N denotes a reference to Id. If this is the
22283 -- case, set global flag Seen to True and stop the traversal.
22289 function Is_Reference
(N
: Node_Id
) return Traverse_Result
is
22291 if Is_Entity_Name
(N
)
22292 and then Present
(Entity
(N
))
22293 and then Entity
(N
) = Id
22302 procedure Inspect_Expression
is new Traverse_Proc
(Is_Reference
);
22304 -- Start of processing for Referenced
22307 Inspect_Expression
(Expr
);
22311 ------------------------------------
22312 -- References_Generic_Formal_Type --
22313 ------------------------------------
22315 function References_Generic_Formal_Type
(N
: Node_Id
) return Boolean is
22317 function Process
(N
: Node_Id
) return Traverse_Result
;
22318 -- Process one node in search for generic formal type
22324 function Process
(N
: Node_Id
) return Traverse_Result
is
22326 if Nkind
(N
) in N_Has_Entity
then
22328 E
: constant Entity_Id
:= Entity
(N
);
22330 if Present
(E
) then
22331 if Is_Generic_Type
(E
) then
22333 elsif Present
(Etype
(E
))
22334 and then Is_Generic_Type
(Etype
(E
))
22345 function Traverse
is new Traverse_Func
(Process
);
22346 -- Traverse tree to look for generic type
22349 if Inside_A_Generic
then
22350 return Traverse
(N
) = Abandon
;
22354 end References_Generic_Formal_Type
;
22356 -------------------
22357 -- Remove_Entity --
22358 -------------------
22360 procedure Remove_Entity
(Id
: Entity_Id
) is
22361 Scop
: constant Entity_Id
:= Scope
(Id
);
22362 Prev_Id
: Entity_Id
;
22365 -- Remove the entity from the homonym chain. When the entity is the
22366 -- head of the chain, associate the entry in the name table with its
22367 -- homonym effectively making it the new head of the chain.
22369 if Current_Entity
(Id
) = Id
then
22370 Set_Name_Entity_Id
(Chars
(Id
), Homonym
(Id
));
22372 -- Otherwise link the previous and next homonyms
22375 Prev_Id
:= Current_Entity
(Id
);
22376 while Present
(Prev_Id
) and then Homonym
(Prev_Id
) /= Id
loop
22377 Prev_Id
:= Homonym
(Prev_Id
);
22380 Set_Homonym
(Prev_Id
, Homonym
(Id
));
22383 -- Remove the entity from the scope entity chain. When the entity is
22384 -- the head of the chain, set the next entity as the new head of the
22387 if First_Entity
(Scop
) = Id
then
22389 Set_First_Entity
(Scop
, Next_Entity
(Id
));
22391 -- Otherwise the entity is either in the middle of the chain or it acts
22392 -- as its tail. Traverse and link the previous and next entities.
22395 Prev_Id
:= First_Entity
(Scop
);
22396 while Present
(Prev_Id
) and then Next_Entity
(Prev_Id
) /= Id
loop
22397 Next_Entity
(Prev_Id
);
22400 Set_Next_Entity
(Prev_Id
, Next_Entity
(Id
));
22403 -- Handle the case where the entity acts as the tail of the scope entity
22406 if Last_Entity
(Scop
) = Id
then
22407 Set_Last_Entity
(Scop
, Prev_Id
);
22411 --------------------
22412 -- Remove_Homonym --
22413 --------------------
22415 procedure Remove_Homonym
(E
: Entity_Id
) is
22416 Prev
: Entity_Id
:= Empty
;
22420 if E
= Current_Entity
(E
) then
22421 if Present
(Homonym
(E
)) then
22422 Set_Current_Entity
(Homonym
(E
));
22424 Set_Name_Entity_Id
(Chars
(E
), Empty
);
22428 H
:= Current_Entity
(E
);
22429 while Present
(H
) and then H
/= E
loop
22434 -- If E is not on the homonym chain, nothing to do
22436 if Present
(H
) then
22437 Set_Homonym
(Prev
, Homonym
(E
));
22440 end Remove_Homonym
;
22442 ------------------------------
22443 -- Remove_Overloaded_Entity --
22444 ------------------------------
22446 procedure Remove_Overloaded_Entity
(Id
: Entity_Id
) is
22447 procedure Remove_Primitive_Of
(Typ
: Entity_Id
);
22448 -- Remove primitive subprogram Id from the list of primitives that
22449 -- belong to type Typ.
22451 -------------------------
22452 -- Remove_Primitive_Of --
22453 -------------------------
22455 procedure Remove_Primitive_Of
(Typ
: Entity_Id
) is
22459 if Is_Tagged_Type
(Typ
) then
22460 Prims
:= Direct_Primitive_Operations
(Typ
);
22462 if Present
(Prims
) then
22463 Remove
(Prims
, Id
);
22466 end Remove_Primitive_Of
;
22470 Formal
: Entity_Id
;
22472 -- Start of processing for Remove_Overloaded_Entity
22475 -- Remove the entity from both the homonym and scope chains
22477 Remove_Entity
(Id
);
22479 -- The entity denotes a primitive subprogram. Remove it from the list of
22480 -- primitives of the associated controlling type.
22482 if Ekind_In
(Id
, E_Function
, E_Procedure
) and then Is_Primitive
(Id
) then
22483 Formal
:= First_Formal
(Id
);
22484 while Present
(Formal
) loop
22485 if Is_Controlling_Formal
(Formal
) then
22486 Remove_Primitive_Of
(Etype
(Formal
));
22490 Next_Formal
(Formal
);
22493 if Ekind
(Id
) = E_Function
and then Has_Controlling_Result
(Id
) then
22494 Remove_Primitive_Of
(Etype
(Id
));
22497 end Remove_Overloaded_Entity
;
22499 ---------------------
22500 -- Rep_To_Pos_Flag --
22501 ---------------------
22503 function Rep_To_Pos_Flag
(E
: Entity_Id
; Loc
: Source_Ptr
) return Node_Id
is
22505 return New_Occurrence_Of
22506 (Boolean_Literals
(not Range_Checks_Suppressed
(E
)), Loc
);
22507 end Rep_To_Pos_Flag
;
22509 --------------------
22510 -- Require_Entity --
22511 --------------------
22513 procedure Require_Entity
(N
: Node_Id
) is
22515 if Is_Entity_Name
(N
) and then No
(Entity
(N
)) then
22516 if Total_Errors_Detected
/= 0 then
22517 Set_Entity
(N
, Any_Id
);
22519 raise Program_Error
;
22522 end Require_Entity
;
22524 ------------------------------
22525 -- Requires_Transient_Scope --
22526 ------------------------------
22528 -- A transient scope is required when variable-sized temporaries are
22529 -- allocated on the secondary stack, or when finalization actions must be
22530 -- generated before the next instruction.
22532 function Requires_Transient_Scope
(Id
: Entity_Id
) return Boolean is
22533 Old_Result
: constant Boolean := Old_Requires_Transient_Scope
(Id
);
22536 if Debug_Flag_QQ
then
22541 New_Result
: constant Boolean := New_Requires_Transient_Scope
(Id
);
22544 -- Assert that we're not putting things on the secondary stack if we
22545 -- didn't before; we are trying to AVOID secondary stack when
22548 if not Old_Result
then
22549 pragma Assert
(not New_Result
);
22553 if New_Result
/= Old_Result
then
22554 Results_Differ
(Id
, Old_Result
, New_Result
);
22559 end Requires_Transient_Scope
;
22561 --------------------
22562 -- Results_Differ --
22563 --------------------
22565 procedure Results_Differ
22571 if False then -- False to disable; True for debugging
22572 Treepr
.Print_Tree_Node
(Id
);
22574 if Old_Val
= New_Val
then
22575 raise Program_Error
;
22578 end Results_Differ
;
22580 --------------------------
22581 -- Reset_Analyzed_Flags --
22582 --------------------------
22584 procedure Reset_Analyzed_Flags
(N
: Node_Id
) is
22585 function Clear_Analyzed
(N
: Node_Id
) return Traverse_Result
;
22586 -- Function used to reset Analyzed flags in tree. Note that we do
22587 -- not reset Analyzed flags in entities, since there is no need to
22588 -- reanalyze entities, and indeed, it is wrong to do so, since it
22589 -- can result in generating auxiliary stuff more than once.
22591 --------------------
22592 -- Clear_Analyzed --
22593 --------------------
22595 function Clear_Analyzed
(N
: Node_Id
) return Traverse_Result
is
22597 if Nkind
(N
) not in N_Entity
then
22598 Set_Analyzed
(N
, False);
22602 end Clear_Analyzed
;
22604 procedure Reset_Analyzed
is new Traverse_Proc
(Clear_Analyzed
);
22606 -- Start of processing for Reset_Analyzed_Flags
22609 Reset_Analyzed
(N
);
22610 end Reset_Analyzed_Flags
;
22612 ------------------------
22613 -- Restore_SPARK_Mode --
22614 ------------------------
22616 procedure Restore_SPARK_Mode
22617 (Mode
: SPARK_Mode_Type
;
22621 SPARK_Mode
:= Mode
;
22622 SPARK_Mode_Pragma
:= Prag
;
22623 end Restore_SPARK_Mode
;
22625 --------------------------------
22626 -- Returns_Unconstrained_Type --
22627 --------------------------------
22629 function Returns_Unconstrained_Type
(Subp
: Entity_Id
) return Boolean is
22631 return Ekind
(Subp
) = E_Function
22632 and then not Is_Scalar_Type
(Etype
(Subp
))
22633 and then not Is_Access_Type
(Etype
(Subp
))
22634 and then not Is_Constrained
(Etype
(Subp
));
22635 end Returns_Unconstrained_Type
;
22637 ----------------------------
22638 -- Root_Type_Of_Full_View --
22639 ----------------------------
22641 function Root_Type_Of_Full_View
(T
: Entity_Id
) return Entity_Id
is
22642 Rtyp
: constant Entity_Id
:= Root_Type
(T
);
22645 -- The root type of the full view may itself be a private type. Keep
22646 -- looking for the ultimate derivation parent.
22648 if Is_Private_Type
(Rtyp
) and then Present
(Full_View
(Rtyp
)) then
22649 return Root_Type_Of_Full_View
(Full_View
(Rtyp
));
22653 end Root_Type_Of_Full_View
;
22655 ---------------------------
22656 -- Safe_To_Capture_Value --
22657 ---------------------------
22659 function Safe_To_Capture_Value
22662 Cond
: Boolean := False) return Boolean
22665 -- The only entities for which we track constant values are variables
22666 -- which are not renamings, constants, out parameters, and in out
22667 -- parameters, so check if we have this case.
22669 -- Note: it may seem odd to track constant values for constants, but in
22670 -- fact this routine is used for other purposes than simply capturing
22671 -- the value. In particular, the setting of Known[_Non]_Null.
22673 if (Ekind
(Ent
) = E_Variable
and then No
(Renamed_Object
(Ent
)))
22675 Ekind_In
(Ent
, E_Constant
, E_Out_Parameter
, E_In_Out_Parameter
)
22679 -- For conditionals, we also allow loop parameters and all formals,
22680 -- including in parameters.
22682 elsif Cond
and then Ekind_In
(Ent
, E_Loop_Parameter
, E_In_Parameter
) then
22685 -- For all other cases, not just unsafe, but impossible to capture
22686 -- Current_Value, since the above are the only entities which have
22687 -- Current_Value fields.
22693 -- Skip if volatile or aliased, since funny things might be going on in
22694 -- these cases which we cannot necessarily track. Also skip any variable
22695 -- for which an address clause is given, or whose address is taken. Also
22696 -- never capture value of library level variables (an attempt to do so
22697 -- can occur in the case of package elaboration code).
22699 if Treat_As_Volatile
(Ent
)
22700 or else Is_Aliased
(Ent
)
22701 or else Present
(Address_Clause
(Ent
))
22702 or else Address_Taken
(Ent
)
22703 or else (Is_Library_Level_Entity
(Ent
)
22704 and then Ekind
(Ent
) = E_Variable
)
22709 -- OK, all above conditions are met. We also require that the scope of
22710 -- the reference be the same as the scope of the entity, not counting
22711 -- packages and blocks and loops.
22714 E_Scope
: constant Entity_Id
:= Scope
(Ent
);
22715 R_Scope
: Entity_Id
;
22718 R_Scope
:= Current_Scope
;
22719 while R_Scope
/= Standard_Standard
loop
22720 exit when R_Scope
= E_Scope
;
22722 if not Ekind_In
(R_Scope
, E_Package
, E_Block
, E_Loop
) then
22725 R_Scope
:= Scope
(R_Scope
);
22730 -- We also require that the reference does not appear in a context
22731 -- where it is not sure to be executed (i.e. a conditional context
22732 -- or an exception handler). We skip this if Cond is True, since the
22733 -- capturing of values from conditional tests handles this ok.
22746 -- Seems dubious that case expressions are not handled here ???
22749 while Present
(P
) loop
22750 if Nkind
(P
) = N_If_Statement
22751 or else Nkind
(P
) = N_Case_Statement
22752 or else (Nkind
(P
) in N_Short_Circuit
22753 and then Desc
= Right_Opnd
(P
))
22754 or else (Nkind
(P
) = N_If_Expression
22755 and then Desc
/= First
(Expressions
(P
)))
22756 or else Nkind
(P
) = N_Exception_Handler
22757 or else Nkind
(P
) = N_Selective_Accept
22758 or else Nkind
(P
) = N_Conditional_Entry_Call
22759 or else Nkind
(P
) = N_Timed_Entry_Call
22760 or else Nkind
(P
) = N_Asynchronous_Select
22768 -- A special Ada 2012 case: the original node may be part
22769 -- of the else_actions of a conditional expression, in which
22770 -- case it might not have been expanded yet, and appears in
22771 -- a non-syntactic list of actions. In that case it is clearly
22772 -- not safe to save a value.
22775 and then Is_List_Member
(Desc
)
22776 and then No
(Parent
(List_Containing
(Desc
)))
22784 -- OK, looks safe to set value
22787 end Safe_To_Capture_Value
;
22793 function Same_Name
(N1
, N2
: Node_Id
) return Boolean is
22794 K1
: constant Node_Kind
:= Nkind
(N1
);
22795 K2
: constant Node_Kind
:= Nkind
(N2
);
22798 if (K1
= N_Identifier
or else K1
= N_Defining_Identifier
)
22799 and then (K2
= N_Identifier
or else K2
= N_Defining_Identifier
)
22801 return Chars
(N1
) = Chars
(N2
);
22803 elsif (K1
= N_Selected_Component
or else K1
= N_Expanded_Name
)
22804 and then (K2
= N_Selected_Component
or else K2
= N_Expanded_Name
)
22806 return Same_Name
(Selector_Name
(N1
), Selector_Name
(N2
))
22807 and then Same_Name
(Prefix
(N1
), Prefix
(N2
));
22818 function Same_Object
(Node1
, Node2
: Node_Id
) return Boolean is
22819 N1
: constant Node_Id
:= Original_Node
(Node1
);
22820 N2
: constant Node_Id
:= Original_Node
(Node2
);
22821 -- We do the tests on original nodes, since we are most interested
22822 -- in the original source, not any expansion that got in the way.
22824 K1
: constant Node_Kind
:= Nkind
(N1
);
22825 K2
: constant Node_Kind
:= Nkind
(N2
);
22828 -- First case, both are entities with same entity
22830 if K1
in N_Has_Entity
and then K2
in N_Has_Entity
then
22832 EN1
: constant Entity_Id
:= Entity
(N1
);
22833 EN2
: constant Entity_Id
:= Entity
(N2
);
22835 if Present
(EN1
) and then Present
(EN2
)
22836 and then (Ekind_In
(EN1
, E_Variable
, E_Constant
)
22837 or else Is_Formal
(EN1
))
22845 -- Second case, selected component with same selector, same record
22847 if K1
= N_Selected_Component
22848 and then K2
= N_Selected_Component
22849 and then Chars
(Selector_Name
(N1
)) = Chars
(Selector_Name
(N2
))
22851 return Same_Object
(Prefix
(N1
), Prefix
(N2
));
22853 -- Third case, indexed component with same subscripts, same array
22855 elsif K1
= N_Indexed_Component
22856 and then K2
= N_Indexed_Component
22857 and then Same_Object
(Prefix
(N1
), Prefix
(N2
))
22862 E1
:= First
(Expressions
(N1
));
22863 E2
:= First
(Expressions
(N2
));
22864 while Present
(E1
) loop
22865 if not Same_Value
(E1
, E2
) then
22876 -- Fourth case, slice of same array with same bounds
22879 and then K2
= N_Slice
22880 and then Nkind
(Discrete_Range
(N1
)) = N_Range
22881 and then Nkind
(Discrete_Range
(N2
)) = N_Range
22882 and then Same_Value
(Low_Bound
(Discrete_Range
(N1
)),
22883 Low_Bound
(Discrete_Range
(N2
)))
22884 and then Same_Value
(High_Bound
(Discrete_Range
(N1
)),
22885 High_Bound
(Discrete_Range
(N2
)))
22887 return Same_Name
(Prefix
(N1
), Prefix
(N2
));
22889 -- All other cases, not clearly the same object
22900 function Same_Type
(T1
, T2
: Entity_Id
) return Boolean is
22905 elsif not Is_Constrained
(T1
)
22906 and then not Is_Constrained
(T2
)
22907 and then Base_Type
(T1
) = Base_Type
(T2
)
22911 -- For now don't bother with case of identical constraints, to be
22912 -- fiddled with later on perhaps (this is only used for optimization
22913 -- purposes, so it is not critical to do a best possible job)
22924 function Same_Value
(Node1
, Node2
: Node_Id
) return Boolean is
22926 if Compile_Time_Known_Value
(Node1
)
22927 and then Compile_Time_Known_Value
(Node2
)
22929 -- Handle properly compile-time expressions that are not
22932 if Is_String_Type
(Etype
(Node1
)) then
22933 return Expr_Value_S
(Node1
) = Expr_Value_S
(Node2
);
22936 return Expr_Value
(Node1
) = Expr_Value
(Node2
);
22939 elsif Same_Object
(Node1
, Node2
) then
22946 --------------------
22947 -- Set_SPARK_Mode --
22948 --------------------
22950 procedure Set_SPARK_Mode
(Context
: Entity_Id
) is
22952 -- Do not consider illegal or partially decorated constructs
22954 if Ekind
(Context
) = E_Void
or else Error_Posted
(Context
) then
22957 elsif Present
(SPARK_Pragma
(Context
)) then
22959 (Mode
=> Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Context
)),
22960 Prag
=> SPARK_Pragma
(Context
));
22962 end Set_SPARK_Mode
;
22964 -------------------------
22965 -- Scalar_Part_Present --
22966 -------------------------
22968 function Scalar_Part_Present
(T
: Entity_Id
) return Boolean is
22972 if Is_Scalar_Type
(T
) then
22975 elsif Is_Array_Type
(T
) then
22976 return Scalar_Part_Present
(Component_Type
(T
));
22978 elsif Is_Record_Type
(T
) or else Has_Discriminants
(T
) then
22979 C
:= First_Component_Or_Discriminant
(T
);
22980 while Present
(C
) loop
22981 if Scalar_Part_Present
(Etype
(C
)) then
22984 Next_Component_Or_Discriminant
(C
);
22990 end Scalar_Part_Present
;
22992 ------------------------
22993 -- Scope_Is_Transient --
22994 ------------------------
22996 function Scope_Is_Transient
return Boolean is
22998 return Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Transient
;
22999 end Scope_Is_Transient
;
23005 function Scope_Within
23006 (Inner
: Entity_Id
;
23007 Outer
: Entity_Id
) return Boolean
23013 while Present
(Curr
) and then Curr
/= Standard_Standard
loop
23014 Curr
:= Scope
(Curr
);
23016 if Curr
= Outer
then
23024 --------------------------
23025 -- Scope_Within_Or_Same --
23026 --------------------------
23028 function Scope_Within_Or_Same
23029 (Inner
: Entity_Id
;
23030 Outer
: Entity_Id
) return Boolean
23036 while Present
(Curr
) and then Curr
/= Standard_Standard
loop
23037 if Curr
= Outer
then
23041 Curr
:= Scope
(Curr
);
23045 end Scope_Within_Or_Same
;
23047 --------------------
23048 -- Set_Convention --
23049 --------------------
23051 procedure Set_Convention
(E
: Entity_Id
; Val
: Snames
.Convention_Id
) is
23053 Basic_Set_Convention
(E
, Val
);
23056 and then Is_Access_Subprogram_Type
(Base_Type
(E
))
23057 and then Has_Foreign_Convention
(E
)
23059 Set_Can_Use_Internal_Rep
(E
, False);
23062 -- If E is an object, including a component, and the type of E is an
23063 -- anonymous access type with no convention set, then also set the
23064 -- convention of the anonymous access type. We do not do this for
23065 -- anonymous protected types, since protected types always have the
23066 -- default convention.
23068 if Present
(Etype
(E
))
23069 and then (Is_Object
(E
)
23071 -- Allow E_Void (happens for pragma Convention appearing
23072 -- in the middle of a record applying to a component)
23074 or else Ekind
(E
) = E_Void
)
23077 Typ
: constant Entity_Id
:= Etype
(E
);
23080 if Ekind_In
(Typ
, E_Anonymous_Access_Type
,
23081 E_Anonymous_Access_Subprogram_Type
)
23082 and then not Has_Convention_Pragma
(Typ
)
23084 Basic_Set_Convention
(Typ
, Val
);
23085 Set_Has_Convention_Pragma
(Typ
);
23087 -- And for the access subprogram type, deal similarly with the
23088 -- designated E_Subprogram_Type, which is always internal.
23090 if Ekind
(Typ
) = E_Anonymous_Access_Subprogram_Type
then
23092 Dtype
: constant Entity_Id
:= Designated_Type
(Typ
);
23094 if Ekind
(Dtype
) = E_Subprogram_Type
23095 and then not Has_Convention_Pragma
(Dtype
)
23097 Basic_Set_Convention
(Dtype
, Val
);
23098 Set_Has_Convention_Pragma
(Dtype
);
23105 end Set_Convention
;
23107 ------------------------
23108 -- Set_Current_Entity --
23109 ------------------------
23111 -- The given entity is to be set as the currently visible definition of its
23112 -- associated name (i.e. the Node_Id associated with its name). All we have
23113 -- to do is to get the name from the identifier, and then set the
23114 -- associated Node_Id to point to the given entity.
23116 procedure Set_Current_Entity
(E
: Entity_Id
) is
23118 Set_Name_Entity_Id
(Chars
(E
), E
);
23119 end Set_Current_Entity
;
23121 ---------------------------
23122 -- Set_Debug_Info_Needed --
23123 ---------------------------
23125 procedure Set_Debug_Info_Needed
(T
: Entity_Id
) is
23127 procedure Set_Debug_Info_Needed_If_Not_Set
(E
: Entity_Id
);
23128 pragma Inline
(Set_Debug_Info_Needed_If_Not_Set
);
23129 -- Used to set debug info in a related node if not set already
23131 --------------------------------------
23132 -- Set_Debug_Info_Needed_If_Not_Set --
23133 --------------------------------------
23135 procedure Set_Debug_Info_Needed_If_Not_Set
(E
: Entity_Id
) is
23137 if Present
(E
) and then not Needs_Debug_Info
(E
) then
23138 Set_Debug_Info_Needed
(E
);
23140 -- For a private type, indicate that the full view also needs
23141 -- debug information.
23144 and then Is_Private_Type
(E
)
23145 and then Present
(Full_View
(E
))
23147 Set_Debug_Info_Needed
(Full_View
(E
));
23150 end Set_Debug_Info_Needed_If_Not_Set
;
23152 -- Start of processing for Set_Debug_Info_Needed
23155 -- Nothing to do if argument is Empty or has Debug_Info_Off set, which
23156 -- indicates that Debug_Info_Needed is never required for the entity.
23157 -- Nothing to do if entity comes from a predefined file. Library files
23158 -- are compiled without debug information, but inlined bodies of these
23159 -- routines may appear in user code, and debug information on them ends
23160 -- up complicating debugging the user code.
23163 or else Debug_Info_Off
(T
)
23167 elsif In_Inlined_Body
and then In_Predefined_Unit
(T
) then
23168 Set_Needs_Debug_Info
(T
, False);
23171 -- Set flag in entity itself. Note that we will go through the following
23172 -- circuitry even if the flag is already set on T. That's intentional,
23173 -- it makes sure that the flag will be set in subsidiary entities.
23175 Set_Needs_Debug_Info
(T
);
23177 -- Set flag on subsidiary entities if not set already
23179 if Is_Object
(T
) then
23180 Set_Debug_Info_Needed_If_Not_Set
(Etype
(T
));
23182 elsif Is_Type
(T
) then
23183 Set_Debug_Info_Needed_If_Not_Set
(Etype
(T
));
23185 if Is_Record_Type
(T
) then
23187 Ent
: Entity_Id
:= First_Entity
(T
);
23189 while Present
(Ent
) loop
23190 Set_Debug_Info_Needed_If_Not_Set
(Ent
);
23195 -- For a class wide subtype, we also need debug information
23196 -- for the equivalent type.
23198 if Ekind
(T
) = E_Class_Wide_Subtype
then
23199 Set_Debug_Info_Needed_If_Not_Set
(Equivalent_Type
(T
));
23202 elsif Is_Array_Type
(T
) then
23203 Set_Debug_Info_Needed_If_Not_Set
(Component_Type
(T
));
23206 Indx
: Node_Id
:= First_Index
(T
);
23208 while Present
(Indx
) loop
23209 Set_Debug_Info_Needed_If_Not_Set
(Etype
(Indx
));
23210 Indx
:= Next_Index
(Indx
);
23214 -- For a packed array type, we also need debug information for
23215 -- the type used to represent the packed array. Conversely, we
23216 -- also need it for the former if we need it for the latter.
23218 if Is_Packed
(T
) then
23219 Set_Debug_Info_Needed_If_Not_Set
(Packed_Array_Impl_Type
(T
));
23222 if Is_Packed_Array_Impl_Type
(T
) then
23223 Set_Debug_Info_Needed_If_Not_Set
(Original_Array_Type
(T
));
23226 elsif Is_Access_Type
(T
) then
23227 Set_Debug_Info_Needed_If_Not_Set
(Directly_Designated_Type
(T
));
23229 elsif Is_Private_Type
(T
) then
23231 FV
: constant Entity_Id
:= Full_View
(T
);
23234 Set_Debug_Info_Needed_If_Not_Set
(FV
);
23236 -- If the full view is itself a derived private type, we need
23237 -- debug information on its underlying type.
23240 and then Is_Private_Type
(FV
)
23241 and then Present
(Underlying_Full_View
(FV
))
23243 Set_Needs_Debug_Info
(Underlying_Full_View
(FV
));
23247 elsif Is_Protected_Type
(T
) then
23248 Set_Debug_Info_Needed_If_Not_Set
(Corresponding_Record_Type
(T
));
23250 elsif Is_Scalar_Type
(T
) then
23252 -- If the subrange bounds are materialized by dedicated constant
23253 -- objects, also include them in the debug info to make sure the
23254 -- debugger can properly use them.
23256 if Present
(Scalar_Range
(T
))
23257 and then Nkind
(Scalar_Range
(T
)) = N_Range
23260 Low_Bnd
: constant Node_Id
:= Type_Low_Bound
(T
);
23261 High_Bnd
: constant Node_Id
:= Type_High_Bound
(T
);
23264 if Is_Entity_Name
(Low_Bnd
) then
23265 Set_Debug_Info_Needed_If_Not_Set
(Entity
(Low_Bnd
));
23268 if Is_Entity_Name
(High_Bnd
) then
23269 Set_Debug_Info_Needed_If_Not_Set
(Entity
(High_Bnd
));
23275 end Set_Debug_Info_Needed
;
23277 ----------------------------
23278 -- Set_Entity_With_Checks --
23279 ----------------------------
23281 procedure Set_Entity_With_Checks
(N
: Node_Id
; Val
: Entity_Id
) is
23282 Val_Actual
: Entity_Id
;
23284 Post_Node
: Node_Id
;
23287 -- Unconditionally set the entity
23289 Set_Entity
(N
, Val
);
23291 -- The node to post on is the selector in the case of an expanded name,
23292 -- and otherwise the node itself.
23294 if Nkind
(N
) = N_Expanded_Name
then
23295 Post_Node
:= Selector_Name
(N
);
23300 -- Check for violation of No_Fixed_IO
23302 if Restriction_Check_Required
(No_Fixed_IO
)
23304 ((RTU_Loaded
(Ada_Text_IO
)
23305 and then (Is_RTE
(Val
, RE_Decimal_IO
)
23307 Is_RTE
(Val
, RE_Fixed_IO
)))
23310 (RTU_Loaded
(Ada_Wide_Text_IO
)
23311 and then (Is_RTE
(Val
, RO_WT_Decimal_IO
)
23313 Is_RTE
(Val
, RO_WT_Fixed_IO
)))
23316 (RTU_Loaded
(Ada_Wide_Wide_Text_IO
)
23317 and then (Is_RTE
(Val
, RO_WW_Decimal_IO
)
23319 Is_RTE
(Val
, RO_WW_Fixed_IO
))))
23321 -- A special extra check, don't complain about a reference from within
23322 -- the Ada.Interrupts package itself!
23324 and then not In_Same_Extended_Unit
(N
, Val
)
23326 Check_Restriction
(No_Fixed_IO
, Post_Node
);
23329 -- Remaining checks are only done on source nodes. Note that we test
23330 -- for violation of No_Fixed_IO even on non-source nodes, because the
23331 -- cases for checking violations of this restriction are instantiations
23332 -- where the reference in the instance has Comes_From_Source False.
23334 if not Comes_From_Source
(N
) then
23338 -- Check for violation of No_Abort_Statements, which is triggered by
23339 -- call to Ada.Task_Identification.Abort_Task.
23341 if Restriction_Check_Required
(No_Abort_Statements
)
23342 and then (Is_RTE
(Val
, RE_Abort_Task
))
23344 -- A special extra check, don't complain about a reference from within
23345 -- the Ada.Task_Identification package itself!
23347 and then not In_Same_Extended_Unit
(N
, Val
)
23349 Check_Restriction
(No_Abort_Statements
, Post_Node
);
23352 if Val
= Standard_Long_Long_Integer
then
23353 Check_Restriction
(No_Long_Long_Integers
, Post_Node
);
23356 -- Check for violation of No_Dynamic_Attachment
23358 if Restriction_Check_Required
(No_Dynamic_Attachment
)
23359 and then RTU_Loaded
(Ada_Interrupts
)
23360 and then (Is_RTE
(Val
, RE_Is_Reserved
) or else
23361 Is_RTE
(Val
, RE_Is_Attached
) or else
23362 Is_RTE
(Val
, RE_Current_Handler
) or else
23363 Is_RTE
(Val
, RE_Attach_Handler
) or else
23364 Is_RTE
(Val
, RE_Exchange_Handler
) or else
23365 Is_RTE
(Val
, RE_Detach_Handler
) or else
23366 Is_RTE
(Val
, RE_Reference
))
23368 -- A special extra check, don't complain about a reference from within
23369 -- the Ada.Interrupts package itself!
23371 and then not In_Same_Extended_Unit
(N
, Val
)
23373 Check_Restriction
(No_Dynamic_Attachment
, Post_Node
);
23376 -- Check for No_Implementation_Identifiers
23378 if Restriction_Check_Required
(No_Implementation_Identifiers
) then
23380 -- We have an implementation defined entity if it is marked as
23381 -- implementation defined, or is defined in a package marked as
23382 -- implementation defined. However, library packages themselves
23383 -- are excluded (we don't want to flag Interfaces itself, just
23384 -- the entities within it).
23386 if (Is_Implementation_Defined
(Val
)
23388 (Present
(Scope
(Val
))
23389 and then Is_Implementation_Defined
(Scope
(Val
))))
23390 and then not (Ekind_In
(Val
, E_Package
, E_Generic_Package
)
23391 and then Is_Library_Level_Entity
(Val
))
23393 Check_Restriction
(No_Implementation_Identifiers
, Post_Node
);
23397 -- Do the style check
23400 and then not Suppress_Style_Checks
(Val
)
23401 and then not In_Instance
23403 if Nkind
(N
) = N_Identifier
then
23405 elsif Nkind
(N
) = N_Expanded_Name
then
23406 Nod
:= Selector_Name
(N
);
23411 -- A special situation arises for derived operations, where we want
23412 -- to do the check against the parent (since the Sloc of the derived
23413 -- operation points to the derived type declaration itself).
23416 while not Comes_From_Source
(Val_Actual
)
23417 and then Nkind
(Val_Actual
) in N_Entity
23418 and then (Ekind
(Val_Actual
) = E_Enumeration_Literal
23419 or else Is_Subprogram_Or_Generic_Subprogram
(Val_Actual
))
23420 and then Present
(Alias
(Val_Actual
))
23422 Val_Actual
:= Alias
(Val_Actual
);
23425 -- Renaming declarations for generic actuals do not come from source,
23426 -- and have a different name from that of the entity they rename, so
23427 -- there is no style check to perform here.
23429 if Chars
(Nod
) = Chars
(Val_Actual
) then
23430 Style
.Check_Identifier
(Nod
, Val_Actual
);
23434 Set_Entity
(N
, Val
);
23435 end Set_Entity_With_Checks
;
23437 ------------------------
23438 -- Set_Name_Entity_Id --
23439 ------------------------
23441 procedure Set_Name_Entity_Id
(Id
: Name_Id
; Val
: Entity_Id
) is
23443 Set_Name_Table_Int
(Id
, Int
(Val
));
23444 end Set_Name_Entity_Id
;
23446 ---------------------
23447 -- Set_Next_Actual --
23448 ---------------------
23450 procedure Set_Next_Actual
(Ass1_Id
: Node_Id
; Ass2_Id
: Node_Id
) is
23452 if Nkind
(Parent
(Ass1_Id
)) = N_Parameter_Association
then
23453 Set_First_Named_Actual
(Parent
(Ass1_Id
), Ass2_Id
);
23455 end Set_Next_Actual
;
23457 ----------------------------------
23458 -- Set_Optimize_Alignment_Flags --
23459 ----------------------------------
23461 procedure Set_Optimize_Alignment_Flags
(E
: Entity_Id
) is
23463 if Optimize_Alignment
= 'S' then
23464 Set_Optimize_Alignment_Space
(E
);
23465 elsif Optimize_Alignment
= 'T' then
23466 Set_Optimize_Alignment_Time
(E
);
23468 end Set_Optimize_Alignment_Flags
;
23470 -----------------------
23471 -- Set_Public_Status --
23472 -----------------------
23474 procedure Set_Public_Status
(Id
: Entity_Id
) is
23475 S
: constant Entity_Id
:= Current_Scope
;
23477 function Within_HSS_Or_If
(E
: Entity_Id
) return Boolean;
23478 -- Determines if E is defined within handled statement sequence or
23479 -- an if statement, returns True if so, False otherwise.
23481 ----------------------
23482 -- Within_HSS_Or_If --
23483 ----------------------
23485 function Within_HSS_Or_If
(E
: Entity_Id
) return Boolean is
23488 N
:= Declaration_Node
(E
);
23495 elsif Nkind_In
(N
, N_Handled_Sequence_Of_Statements
,
23501 end Within_HSS_Or_If
;
23503 -- Start of processing for Set_Public_Status
23506 -- Everything in the scope of Standard is public
23508 if S
= Standard_Standard
then
23509 Set_Is_Public
(Id
);
23511 -- Entity is definitely not public if enclosing scope is not public
23513 elsif not Is_Public
(S
) then
23516 -- An object or function declaration that occurs in a handled sequence
23517 -- of statements or within an if statement is the declaration for a
23518 -- temporary object or local subprogram generated by the expander. It
23519 -- never needs to be made public and furthermore, making it public can
23520 -- cause back end problems.
23522 elsif Nkind_In
(Parent
(Id
), N_Object_Declaration
,
23523 N_Function_Specification
)
23524 and then Within_HSS_Or_If
(Id
)
23528 -- Entities in public packages or records are public
23530 elsif Ekind
(S
) = E_Package
or Is_Record_Type
(S
) then
23531 Set_Is_Public
(Id
);
23533 -- The bounds of an entry family declaration can generate object
23534 -- declarations that are visible to the back-end, e.g. in the
23535 -- the declaration of a composite type that contains tasks.
23537 elsif Is_Concurrent_Type
(S
)
23538 and then not Has_Completion
(S
)
23539 and then Nkind
(Parent
(Id
)) = N_Object_Declaration
23541 Set_Is_Public
(Id
);
23543 end Set_Public_Status
;
23545 -----------------------------
23546 -- Set_Referenced_Modified --
23547 -----------------------------
23549 procedure Set_Referenced_Modified
(N
: Node_Id
; Out_Param
: Boolean) is
23553 -- Deal with indexed or selected component where prefix is modified
23555 if Nkind_In
(N
, N_Indexed_Component
, N_Selected_Component
) then
23556 Pref
:= Prefix
(N
);
23558 -- If prefix is access type, then it is the designated object that is
23559 -- being modified, which means we have no entity to set the flag on.
23561 if No
(Etype
(Pref
)) or else Is_Access_Type
(Etype
(Pref
)) then
23564 -- Otherwise chase the prefix
23567 Set_Referenced_Modified
(Pref
, Out_Param
);
23570 -- Otherwise see if we have an entity name (only other case to process)
23572 elsif Is_Entity_Name
(N
) and then Present
(Entity
(N
)) then
23573 Set_Referenced_As_LHS
(Entity
(N
), not Out_Param
);
23574 Set_Referenced_As_Out_Parameter
(Entity
(N
), Out_Param
);
23576 end Set_Referenced_Modified
;
23582 procedure Set_Rep_Info
(T1
: Entity_Id
; T2
: Entity_Id
) is
23584 Set_Is_Atomic
(T1
, Is_Atomic
(T2
));
23585 Set_Is_Independent
(T1
, Is_Independent
(T2
));
23586 Set_Is_Volatile_Full_Access
(T1
, Is_Volatile_Full_Access
(T2
));
23588 if Is_Base_Type
(T1
) then
23589 Set_Is_Volatile
(T1
, Is_Volatile
(T2
));
23593 ----------------------------
23594 -- Set_Scope_Is_Transient --
23595 ----------------------------
23597 procedure Set_Scope_Is_Transient
(V
: Boolean := True) is
23599 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Transient
:= V
;
23600 end Set_Scope_Is_Transient
;
23602 -------------------
23603 -- Set_Size_Info --
23604 -------------------
23606 procedure Set_Size_Info
(T1
, T2
: Entity_Id
) is
23608 -- We copy Esize, but not RM_Size, since in general RM_Size is
23609 -- subtype specific and does not get inherited by all subtypes.
23611 Set_Esize
(T1
, Esize
(T2
));
23612 Set_Has_Biased_Representation
(T1
, Has_Biased_Representation
(T2
));
23614 if Is_Discrete_Or_Fixed_Point_Type
(T1
)
23616 Is_Discrete_Or_Fixed_Point_Type
(T2
)
23618 Set_Is_Unsigned_Type
(T1
, Is_Unsigned_Type
(T2
));
23621 Set_Alignment
(T1
, Alignment
(T2
));
23624 ------------------------------
23625 -- Should_Ignore_Pragma_Par --
23626 ------------------------------
23628 function Should_Ignore_Pragma_Par
(Prag_Name
: Name_Id
) return Boolean is
23629 pragma Assert
(Compiler_State
= Parsing
);
23630 -- This one can't work during semantic analysis, because we don't have a
23631 -- correct Current_Source_File.
23633 Result
: constant Boolean :=
23634 Get_Name_Table_Boolean3
(Prag_Name
)
23635 and then not Is_Internal_File_Name
23636 (File_Name
(Current_Source_File
));
23639 end Should_Ignore_Pragma_Par
;
23641 ------------------------------
23642 -- Should_Ignore_Pragma_Sem --
23643 ------------------------------
23645 function Should_Ignore_Pragma_Sem
(N
: Node_Id
) return Boolean is
23646 pragma Assert
(Compiler_State
= Analyzing
);
23647 Prag_Name
: constant Name_Id
:= Pragma_Name
(N
);
23648 Result
: constant Boolean :=
23649 Get_Name_Table_Boolean3
(Prag_Name
)
23650 and then not In_Internal_Unit
(N
);
23654 end Should_Ignore_Pragma_Sem
;
23656 --------------------
23657 -- Static_Boolean --
23658 --------------------
23660 function Static_Boolean
(N
: Node_Id
) return Uint
is
23662 Analyze_And_Resolve
(N
, Standard_Boolean
);
23665 or else Error_Posted
(N
)
23666 or else Etype
(N
) = Any_Type
23671 if Is_OK_Static_Expression
(N
) then
23672 if not Raises_Constraint_Error
(N
) then
23673 return Expr_Value
(N
);
23678 elsif Etype
(N
) = Any_Type
then
23682 Flag_Non_Static_Expr
23683 ("static boolean expression required here", N
);
23686 end Static_Boolean
;
23688 --------------------
23689 -- Static_Integer --
23690 --------------------
23692 function Static_Integer
(N
: Node_Id
) return Uint
is
23694 Analyze_And_Resolve
(N
, Any_Integer
);
23697 or else Error_Posted
(N
)
23698 or else Etype
(N
) = Any_Type
23703 if Is_OK_Static_Expression
(N
) then
23704 if not Raises_Constraint_Error
(N
) then
23705 return Expr_Value
(N
);
23710 elsif Etype
(N
) = Any_Type
then
23714 Flag_Non_Static_Expr
23715 ("static integer expression required here", N
);
23718 end Static_Integer
;
23720 --------------------------
23721 -- Statically_Different --
23722 --------------------------
23724 function Statically_Different
(E1
, E2
: Node_Id
) return Boolean is
23725 R1
: constant Node_Id
:= Get_Referenced_Object
(E1
);
23726 R2
: constant Node_Id
:= Get_Referenced_Object
(E2
);
23728 return Is_Entity_Name
(R1
)
23729 and then Is_Entity_Name
(R2
)
23730 and then Entity
(R1
) /= Entity
(R2
)
23731 and then not Is_Formal
(Entity
(R1
))
23732 and then not Is_Formal
(Entity
(R2
));
23733 end Statically_Different
;
23735 --------------------------------------
23736 -- Subject_To_Loop_Entry_Attributes --
23737 --------------------------------------
23739 function Subject_To_Loop_Entry_Attributes
(N
: Node_Id
) return Boolean is
23745 -- The expansion mechanism transform a loop subject to at least one
23746 -- 'Loop_Entry attribute into a conditional block. Infinite loops lack
23747 -- the conditional part.
23749 if Nkind_In
(Stmt
, N_Block_Statement
, N_If_Statement
)
23750 and then Nkind
(Original_Node
(N
)) = N_Loop_Statement
23752 Stmt
:= Original_Node
(N
);
23756 Nkind
(Stmt
) = N_Loop_Statement
23757 and then Present
(Identifier
(Stmt
))
23758 and then Present
(Entity
(Identifier
(Stmt
)))
23759 and then Has_Loop_Entry_Attributes
(Entity
(Identifier
(Stmt
)));
23760 end Subject_To_Loop_Entry_Attributes
;
23762 -----------------------------
23763 -- Subprogram_Access_Level --
23764 -----------------------------
23766 function Subprogram_Access_Level
(Subp
: Entity_Id
) return Uint
is
23768 if Present
(Alias
(Subp
)) then
23769 return Subprogram_Access_Level
(Alias
(Subp
));
23771 return Scope_Depth
(Enclosing_Dynamic_Scope
(Subp
));
23773 end Subprogram_Access_Level
;
23775 ---------------------
23776 -- Subprogram_Name --
23777 ---------------------
23779 function Subprogram_Name
(N
: Node_Id
) return String is
23780 Buf
: Bounded_String
;
23781 Ent
: Node_Id
:= N
;
23785 while Present
(Ent
) loop
23786 case Nkind
(Ent
) is
23787 when N_Subprogram_Body
=>
23788 Ent
:= Defining_Unit_Name
(Specification
(Ent
));
23791 when N_Subprogram_Declaration
=>
23792 Nod
:= Corresponding_Body
(Ent
);
23794 if Present
(Nod
) then
23797 Ent
:= Defining_Unit_Name
(Specification
(Ent
));
23802 when N_Subprogram_Instantiation
23804 | N_Package_Specification
23806 Ent
:= Defining_Unit_Name
(Ent
);
23809 when N_Protected_Type_Declaration
=>
23810 Ent
:= Corresponding_Body
(Ent
);
23813 when N_Protected_Body
23816 Ent
:= Defining_Identifier
(Ent
);
23823 Ent
:= Parent
(Ent
);
23827 return "unknown subprogram:unknown file:0:0";
23830 -- If the subprogram is a child unit, use its simple name to start the
23831 -- construction of the fully qualified name.
23833 if Nkind
(Ent
) = N_Defining_Program_Unit_Name
then
23834 Ent
:= Defining_Identifier
(Ent
);
23837 Append_Entity_Name
(Buf
, Ent
);
23839 -- Append homonym number if needed
23841 if Nkind
(N
) in N_Entity
and then Has_Homonym
(N
) then
23843 H
: Entity_Id
:= Homonym
(N
);
23847 while Present
(H
) loop
23848 if Scope
(H
) = Scope
(N
) then
23862 -- Append source location of Ent to Buf so that the string will
23863 -- look like "subp:file:line:col".
23866 Loc
: constant Source_Ptr
:= Sloc
(Ent
);
23869 Append
(Buf
, Reference_Name
(Get_Source_File_Index
(Loc
)));
23871 Append
(Buf
, Nat
(Get_Logical_Line_Number
(Loc
)));
23873 Append
(Buf
, Nat
(Get_Column_Number
(Loc
)));
23877 end Subprogram_Name
;
23879 -------------------------------
23880 -- Support_Atomic_Primitives --
23881 -------------------------------
23883 function Support_Atomic_Primitives
(Typ
: Entity_Id
) return Boolean is
23887 -- Verify the alignment of Typ is known
23889 if not Known_Alignment
(Typ
) then
23893 if Known_Static_Esize
(Typ
) then
23894 Size
:= UI_To_Int
(Esize
(Typ
));
23896 -- If the Esize (Object_Size) is unknown at compile time, look at the
23897 -- RM_Size (Value_Size) which may have been set by an explicit rep item.
23899 elsif Known_Static_RM_Size
(Typ
) then
23900 Size
:= UI_To_Int
(RM_Size
(Typ
));
23902 -- Otherwise, the size is considered to be unknown.
23908 -- Check that the size of the component is 8, 16, 32, or 64 bits and
23909 -- that Typ is properly aligned.
23912 when 8 |
16 |
32 |
64 =>
23913 return Size
= UI_To_Int
(Alignment
(Typ
)) * 8;
23918 end Support_Atomic_Primitives
;
23924 procedure Trace_Scope
(N
: Node_Id
; E
: Entity_Id
; Msg
: String) is
23926 if Debug_Flag_W
then
23927 for J
in 0 .. Scope_Stack
.Last
loop
23932 Write_Name
(Chars
(E
));
23933 Write_Str
(" from ");
23934 Write_Location
(Sloc
(N
));
23939 -----------------------
23940 -- Transfer_Entities --
23941 -----------------------
23943 procedure Transfer_Entities
(From
: Entity_Id
; To
: Entity_Id
) is
23944 procedure Set_Public_Status_Of
(Id
: Entity_Id
);
23945 -- Set the Is_Public attribute of arbitrary entity Id by calling routine
23946 -- Set_Public_Status. If successful and Id denotes a record type, set
23947 -- the Is_Public attribute of its fields.
23949 --------------------------
23950 -- Set_Public_Status_Of --
23951 --------------------------
23953 procedure Set_Public_Status_Of
(Id
: Entity_Id
) is
23957 if not Is_Public
(Id
) then
23958 Set_Public_Status
(Id
);
23960 -- When the input entity is a public record type, ensure that all
23961 -- its internal fields are also exposed to the linker. The fields
23962 -- of a class-wide type are never made public.
23965 and then Is_Record_Type
(Id
)
23966 and then not Is_Class_Wide_Type
(Id
)
23968 Field
:= First_Entity
(Id
);
23969 while Present
(Field
) loop
23970 Set_Is_Public
(Field
);
23971 Next_Entity
(Field
);
23975 end Set_Public_Status_Of
;
23979 Full_Id
: Entity_Id
;
23982 -- Start of processing for Transfer_Entities
23985 Id
:= First_Entity
(From
);
23987 if Present
(Id
) then
23989 -- Merge the entity chain of the source scope with that of the
23990 -- destination scope.
23992 if Present
(Last_Entity
(To
)) then
23993 Set_Next_Entity
(Last_Entity
(To
), Id
);
23995 Set_First_Entity
(To
, Id
);
23998 Set_Last_Entity
(To
, Last_Entity
(From
));
24000 -- Inspect the entities of the source scope and update their Scope
24003 while Present
(Id
) loop
24004 Set_Scope
(Id
, To
);
24005 Set_Public_Status_Of
(Id
);
24007 -- Handle an internally generated full view for a private type
24009 if Is_Private_Type
(Id
)
24010 and then Present
(Full_View
(Id
))
24011 and then Is_Itype
(Full_View
(Id
))
24013 Full_Id
:= Full_View
(Id
);
24015 Set_Scope
(Full_Id
, To
);
24016 Set_Public_Status_Of
(Full_Id
);
24022 Set_First_Entity
(From
, Empty
);
24023 Set_Last_Entity
(From
, Empty
);
24025 end Transfer_Entities
;
24027 -----------------------
24028 -- Type_Access_Level --
24029 -----------------------
24031 function Type_Access_Level
(Typ
: Entity_Id
) return Uint
is
24035 Btyp
:= Base_Type
(Typ
);
24037 -- Ada 2005 (AI-230): For most cases of anonymous access types, we
24038 -- simply use the level where the type is declared. This is true for
24039 -- stand-alone object declarations, and for anonymous access types
24040 -- associated with components the level is the same as that of the
24041 -- enclosing composite type. However, special treatment is needed for
24042 -- the cases of access parameters, return objects of an anonymous access
24043 -- type, and, in Ada 95, access discriminants of limited types.
24045 if Is_Access_Type
(Btyp
) then
24046 if Ekind
(Btyp
) = E_Anonymous_Access_Type
then
24048 -- If the type is a nonlocal anonymous access type (such as for
24049 -- an access parameter) we treat it as being declared at the
24050 -- library level to ensure that names such as X.all'access don't
24051 -- fail static accessibility checks.
24053 if not Is_Local_Anonymous_Access
(Typ
) then
24054 return Scope_Depth
(Standard_Standard
);
24056 -- If this is a return object, the accessibility level is that of
24057 -- the result subtype of the enclosing function. The test here is
24058 -- little complicated, because we have to account for extended
24059 -- return statements that have been rewritten as blocks, in which
24060 -- case we have to find and the Is_Return_Object attribute of the
24061 -- itype's associated object. It would be nice to find a way to
24062 -- simplify this test, but it doesn't seem worthwhile to add a new
24063 -- flag just for purposes of this test. ???
24065 elsif Ekind
(Scope
(Btyp
)) = E_Return_Statement
24068 and then Nkind
(Associated_Node_For_Itype
(Btyp
)) =
24069 N_Object_Declaration
24070 and then Is_Return_Object
24071 (Defining_Identifier
24072 (Associated_Node_For_Itype
(Btyp
))))
24078 Scop
:= Scope
(Scope
(Btyp
));
24079 while Present
(Scop
) loop
24080 exit when Ekind
(Scop
) = E_Function
;
24081 Scop
:= Scope
(Scop
);
24084 -- Treat the return object's type as having the level of the
24085 -- function's result subtype (as per RM05-6.5(5.3/2)).
24087 return Type_Access_Level
(Etype
(Scop
));
24092 Btyp
:= Root_Type
(Btyp
);
24094 -- The accessibility level of anonymous access types associated with
24095 -- discriminants is that of the current instance of the type, and
24096 -- that's deeper than the type itself (AARM 3.10.2 (12.3.21)).
24098 -- AI-402: access discriminants have accessibility based on the
24099 -- object rather than the type in Ada 2005, so the above paragraph
24102 -- ??? Needs completion with rules from AI-416
24104 if Ada_Version
<= Ada_95
24105 and then Ekind
(Typ
) = E_Anonymous_Access_Type
24106 and then Present
(Associated_Node_For_Itype
(Typ
))
24107 and then Nkind
(Associated_Node_For_Itype
(Typ
)) =
24108 N_Discriminant_Specification
24110 return Scope_Depth
(Enclosing_Dynamic_Scope
(Btyp
)) + 1;
24114 -- Return library level for a generic formal type. This is done because
24115 -- RM(10.3.2) says that "The statically deeper relationship does not
24116 -- apply to ... a descendant of a generic formal type". Rather than
24117 -- checking at each point where a static accessibility check is
24118 -- performed to see if we are dealing with a formal type, this rule is
24119 -- implemented by having Type_Access_Level and Deepest_Type_Access_Level
24120 -- return extreme values for a formal type; Deepest_Type_Access_Level
24121 -- returns Int'Last. By calling the appropriate function from among the
24122 -- two, we ensure that the static accessibility check will pass if we
24123 -- happen to run into a formal type. More specifically, we should call
24124 -- Deepest_Type_Access_Level instead of Type_Access_Level whenever the
24125 -- call occurs as part of a static accessibility check and the error
24126 -- case is the case where the type's level is too shallow (as opposed
24129 if Is_Generic_Type
(Root_Type
(Btyp
)) then
24130 return Scope_Depth
(Standard_Standard
);
24133 return Scope_Depth
(Enclosing_Dynamic_Scope
(Btyp
));
24134 end Type_Access_Level
;
24136 ------------------------------------
24137 -- Type_Without_Stream_Operation --
24138 ------------------------------------
24140 function Type_Without_Stream_Operation
24142 Op
: TSS_Name_Type
:= TSS_Null
) return Entity_Id
24144 BT
: constant Entity_Id
:= Base_Type
(T
);
24145 Op_Missing
: Boolean;
24148 if not Restriction_Active
(No_Default_Stream_Attributes
) then
24152 if Is_Elementary_Type
(T
) then
24153 if Op
= TSS_Null
then
24155 No
(TSS
(BT
, TSS_Stream_Read
))
24156 or else No
(TSS
(BT
, TSS_Stream_Write
));
24159 Op_Missing
:= No
(TSS
(BT
, Op
));
24168 elsif Is_Array_Type
(T
) then
24169 return Type_Without_Stream_Operation
(Component_Type
(T
), Op
);
24171 elsif Is_Record_Type
(T
) then
24177 Comp
:= First_Component
(T
);
24178 while Present
(Comp
) loop
24179 C_Typ
:= Type_Without_Stream_Operation
(Etype
(Comp
), Op
);
24181 if Present
(C_Typ
) then
24185 Next_Component
(Comp
);
24191 elsif Is_Private_Type
(T
) and then Present
(Full_View
(T
)) then
24192 return Type_Without_Stream_Operation
(Full_View
(T
), Op
);
24196 end Type_Without_Stream_Operation
;
24198 ----------------------------
24199 -- Unique_Defining_Entity --
24200 ----------------------------
24202 function Unique_Defining_Entity
(N
: Node_Id
) return Entity_Id
is
24204 return Unique_Entity
(Defining_Entity
(N
));
24205 end Unique_Defining_Entity
;
24207 -------------------
24208 -- Unique_Entity --
24209 -------------------
24211 function Unique_Entity
(E
: Entity_Id
) return Entity_Id
is
24212 U
: Entity_Id
:= E
;
24218 if Present
(Full_View
(E
)) then
24219 U
:= Full_View
(E
);
24223 if Nkind
(Parent
(E
)) = N_Entry_Body
then
24225 Prot_Item
: Entity_Id
;
24226 Prot_Type
: Entity_Id
;
24229 if Ekind
(E
) = E_Entry
then
24230 Prot_Type
:= Scope
(E
);
24232 -- Bodies of entry families are nested within an extra scope
24233 -- that contains an entry index declaration.
24236 Prot_Type
:= Scope
(Scope
(E
));
24239 -- A protected type may be declared as a private type, in
24240 -- which case we need to get its full view.
24242 if Is_Private_Type
(Prot_Type
) then
24243 Prot_Type
:= Full_View
(Prot_Type
);
24246 -- Full view may not be present on error, in which case
24247 -- return E by default.
24249 if Present
(Prot_Type
) then
24250 pragma Assert
(Ekind
(Prot_Type
) = E_Protected_Type
);
24252 -- Traverse the entity list of the protected type and
24253 -- locate an entry declaration which matches the entry
24256 Prot_Item
:= First_Entity
(Prot_Type
);
24257 while Present
(Prot_Item
) loop
24258 if Ekind
(Prot_Item
) in Entry_Kind
24259 and then Corresponding_Body
(Parent
(Prot_Item
)) = E
24265 Next_Entity
(Prot_Item
);
24271 when Formal_Kind
=>
24272 if Present
(Spec_Entity
(E
)) then
24273 U
:= Spec_Entity
(E
);
24276 when E_Package_Body
=>
24279 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
24283 if Nkind
(P
) = N_Package_Body
24284 and then Present
(Corresponding_Spec
(P
))
24286 U
:= Corresponding_Spec
(P
);
24288 elsif Nkind
(P
) = N_Package_Body_Stub
24289 and then Present
(Corresponding_Spec_Of_Stub
(P
))
24291 U
:= Corresponding_Spec_Of_Stub
(P
);
24294 when E_Protected_Body
=>
24297 if Nkind
(P
) = N_Protected_Body
24298 and then Present
(Corresponding_Spec
(P
))
24300 U
:= Corresponding_Spec
(P
);
24302 elsif Nkind
(P
) = N_Protected_Body_Stub
24303 and then Present
(Corresponding_Spec_Of_Stub
(P
))
24305 U
:= Corresponding_Spec_Of_Stub
(P
);
24307 if Is_Single_Protected_Object
(U
) then
24312 if Is_Private_Type
(U
) then
24313 U
:= Full_View
(U
);
24316 when E_Subprogram_Body
=>
24319 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
24325 if Nkind
(P
) = N_Subprogram_Body
24326 and then Present
(Corresponding_Spec
(P
))
24328 U
:= Corresponding_Spec
(P
);
24330 elsif Nkind
(P
) = N_Subprogram_Body_Stub
24331 and then Present
(Corresponding_Spec_Of_Stub
(P
))
24333 U
:= Corresponding_Spec_Of_Stub
(P
);
24335 elsif Nkind
(P
) = N_Subprogram_Renaming_Declaration
then
24336 U
:= Corresponding_Spec
(P
);
24339 when E_Task_Body
=>
24342 if Nkind
(P
) = N_Task_Body
24343 and then Present
(Corresponding_Spec
(P
))
24345 U
:= Corresponding_Spec
(P
);
24347 elsif Nkind
(P
) = N_Task_Body_Stub
24348 and then Present
(Corresponding_Spec_Of_Stub
(P
))
24350 U
:= Corresponding_Spec_Of_Stub
(P
);
24352 if Is_Single_Task_Object
(U
) then
24357 if Is_Private_Type
(U
) then
24358 U
:= Full_View
(U
);
24362 if Present
(Full_View
(E
)) then
24363 U
:= Full_View
(E
);
24377 function Unique_Name
(E
: Entity_Id
) return String is
24379 -- Names in E_Subprogram_Body or E_Package_Body entities are not
24380 -- reliable, as they may not include the overloading suffix. Instead,
24381 -- when looking for the name of E or one of its enclosing scope, we get
24382 -- the name of the corresponding Unique_Entity.
24384 U
: constant Entity_Id
:= Unique_Entity
(E
);
24386 function This_Name
return String;
24392 function This_Name
return String is
24394 return Get_Name_String
(Chars
(U
));
24397 -- Start of processing for Unique_Name
24400 if E
= Standard_Standard
24401 or else Has_Fully_Qualified_Name
(E
)
24405 elsif Ekind
(E
) = E_Enumeration_Literal
then
24406 return Unique_Name
(Etype
(E
)) & "__" & This_Name
;
24410 S
: constant Entity_Id
:= Scope
(U
);
24411 pragma Assert
(Present
(S
));
24414 -- Prefix names of predefined types with standard__, but leave
24415 -- names of user-defined packages and subprograms without prefix
24416 -- (even if technically they are nested in the Standard package).
24418 if S
= Standard_Standard
then
24419 if Ekind
(U
) = E_Package
or else Is_Subprogram
(U
) then
24422 return Unique_Name
(S
) & "__" & This_Name
;
24425 -- For intances of generic subprograms use the name of the related
24426 -- instace and skip the scope of its wrapper package.
24428 elsif Is_Wrapper_Package
(S
) then
24429 pragma Assert
(Scope
(S
) = Scope
(Related_Instance
(S
)));
24430 -- Wrapper package and the instantiation are in the same scope
24433 Enclosing_Name
: constant String :=
24434 Unique_Name
(Scope
(S
)) & "__" &
24435 Get_Name_String
(Chars
(Related_Instance
(S
)));
24438 if Is_Subprogram
(U
)
24439 and then not Is_Generic_Actual_Subprogram
(U
)
24441 return Enclosing_Name
;
24443 return Enclosing_Name
& "__" & This_Name
;
24448 return Unique_Name
(S
) & "__" & This_Name
;
24454 ---------------------
24455 -- Unit_Is_Visible --
24456 ---------------------
24458 function Unit_Is_Visible
(U
: Entity_Id
) return Boolean is
24459 Curr
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
24460 Curr_Entity
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
24462 function Unit_In_Parent_Context
(Par_Unit
: Node_Id
) return Boolean;
24463 -- For a child unit, check whether unit appears in a with_clause
24466 function Unit_In_Context
(Comp_Unit
: Node_Id
) return Boolean;
24467 -- Scan the context clause of one compilation unit looking for a
24468 -- with_clause for the unit in question.
24470 ----------------------------
24471 -- Unit_In_Parent_Context --
24472 ----------------------------
24474 function Unit_In_Parent_Context
(Par_Unit
: Node_Id
) return Boolean is
24476 if Unit_In_Context
(Par_Unit
) then
24479 elsif Is_Child_Unit
(Defining_Entity
(Unit
(Par_Unit
))) then
24480 return Unit_In_Parent_Context
(Parent_Spec
(Unit
(Par_Unit
)));
24485 end Unit_In_Parent_Context
;
24487 ---------------------
24488 -- Unit_In_Context --
24489 ---------------------
24491 function Unit_In_Context
(Comp_Unit
: Node_Id
) return Boolean is
24495 Clause
:= First
(Context_Items
(Comp_Unit
));
24496 while Present
(Clause
) loop
24497 if Nkind
(Clause
) = N_With_Clause
then
24498 if Library_Unit
(Clause
) = U
then
24501 -- The with_clause may denote a renaming of the unit we are
24502 -- looking for, eg. Text_IO which renames Ada.Text_IO.
24505 Renamed_Entity
(Entity
(Name
(Clause
))) =
24506 Defining_Entity
(Unit
(U
))
24516 end Unit_In_Context
;
24518 -- Start of processing for Unit_Is_Visible
24521 -- The currrent unit is directly visible
24526 elsif Unit_In_Context
(Curr
) then
24529 -- If the current unit is a body, check the context of the spec
24531 elsif Nkind
(Unit
(Curr
)) = N_Package_Body
24533 (Nkind
(Unit
(Curr
)) = N_Subprogram_Body
24534 and then not Acts_As_Spec
(Unit
(Curr
)))
24536 if Unit_In_Context
(Library_Unit
(Curr
)) then
24541 -- If the spec is a child unit, examine the parents
24543 if Is_Child_Unit
(Curr_Entity
) then
24544 if Nkind
(Unit
(Curr
)) in N_Unit_Body
then
24546 Unit_In_Parent_Context
24547 (Parent_Spec
(Unit
(Library_Unit
(Curr
))));
24549 return Unit_In_Parent_Context
(Parent_Spec
(Unit
(Curr
)));
24555 end Unit_Is_Visible
;
24557 ------------------------------
24558 -- Universal_Interpretation --
24559 ------------------------------
24561 function Universal_Interpretation
(Opnd
: Node_Id
) return Entity_Id
is
24562 Index
: Interp_Index
;
24566 -- The argument may be a formal parameter of an operator or subprogram
24567 -- with multiple interpretations, or else an expression for an actual.
24569 if Nkind
(Opnd
) = N_Defining_Identifier
24570 or else not Is_Overloaded
(Opnd
)
24572 if Etype
(Opnd
) = Universal_Integer
24573 or else Etype
(Opnd
) = Universal_Real
24575 return Etype
(Opnd
);
24581 Get_First_Interp
(Opnd
, Index
, It
);
24582 while Present
(It
.Typ
) loop
24583 if It
.Typ
= Universal_Integer
24584 or else It
.Typ
= Universal_Real
24589 Get_Next_Interp
(Index
, It
);
24594 end Universal_Interpretation
;
24600 function Unqualify
(Expr
: Node_Id
) return Node_Id
is
24602 -- Recurse to handle unlikely case of multiple levels of qualification
24604 if Nkind
(Expr
) = N_Qualified_Expression
then
24605 return Unqualify
(Expression
(Expr
));
24607 -- Normal case, not a qualified expression
24618 function Unqual_Conv
(Expr
: Node_Id
) return Node_Id
is
24620 -- Recurse to handle unlikely case of multiple levels of qualification
24621 -- and/or conversion.
24623 if Nkind_In
(Expr
, N_Qualified_Expression
,
24625 N_Unchecked_Type_Conversion
)
24627 return Unqual_Conv
(Expression
(Expr
));
24629 -- Normal case, not a qualified expression
24636 -----------------------
24637 -- Visible_Ancestors --
24638 -----------------------
24640 function Visible_Ancestors
(Typ
: Entity_Id
) return Elist_Id
is
24646 pragma Assert
(Is_Record_Type
(Typ
) and then Is_Tagged_Type
(Typ
));
24648 -- Collect all the parents and progenitors of Typ. If the full-view of
24649 -- private parents and progenitors is available then it is used to
24650 -- generate the list of visible ancestors; otherwise their partial
24651 -- view is added to the resulting list.
24656 Use_Full_View
=> True);
24660 Ifaces_List
=> List_2
,
24661 Exclude_Parents
=> True,
24662 Use_Full_View
=> True);
24664 -- Join the two lists. Avoid duplications because an interface may
24665 -- simultaneously be parent and progenitor of a type.
24667 Elmt
:= First_Elmt
(List_2
);
24668 while Present
(Elmt
) loop
24669 Append_Unique_Elmt
(Node
(Elmt
), List_1
);
24674 end Visible_Ancestors
;
24676 ----------------------
24677 -- Within_Init_Proc --
24678 ----------------------
24680 function Within_Init_Proc
return Boolean is
24684 S
:= Current_Scope
;
24685 while not Is_Overloadable
(S
) loop
24686 if S
= Standard_Standard
then
24693 return Is_Init_Proc
(S
);
24694 end Within_Init_Proc
;
24696 ---------------------------
24697 -- Within_Protected_Type --
24698 ---------------------------
24700 function Within_Protected_Type
(E
: Entity_Id
) return Boolean is
24701 Scop
: Entity_Id
:= Scope
(E
);
24704 while Present
(Scop
) loop
24705 if Ekind
(Scop
) = E_Protected_Type
then
24709 Scop
:= Scope
(Scop
);
24713 end Within_Protected_Type
;
24719 function Within_Scope
(E
: Entity_Id
; S
: Entity_Id
) return Boolean is
24721 return Scope_Within_Or_Same
(Scope
(E
), S
);
24724 ----------------------------
24725 -- Within_Subprogram_Call --
24726 ----------------------------
24728 function Within_Subprogram_Call
(N
: Node_Id
) return Boolean is
24732 -- Climb the parent chain looking for a function or procedure call
24735 while Present
(Par
) loop
24736 if Nkind_In
(Par
, N_Entry_Call_Statement
,
24738 N_Procedure_Call_Statement
)
24742 -- Prevent the search from going too far
24744 elsif Is_Body_Or_Package_Declaration
(Par
) then
24748 Par
:= Parent
(Par
);
24752 end Within_Subprogram_Call
;
24758 procedure Wrong_Type
(Expr
: Node_Id
; Expected_Type
: Entity_Id
) is
24759 Found_Type
: constant Entity_Id
:= First_Subtype
(Etype
(Expr
));
24760 Expec_Type
: constant Entity_Id
:= First_Subtype
(Expected_Type
);
24762 Matching_Field
: Entity_Id
;
24763 -- Entity to give a more precise suggestion on how to write a one-
24764 -- element positional aggregate.
24766 function Has_One_Matching_Field
return Boolean;
24767 -- Determines if Expec_Type is a record type with a single component or
24768 -- discriminant whose type matches the found type or is one dimensional
24769 -- array whose component type matches the found type. In the case of
24770 -- one discriminant, we ignore the variant parts. That's not accurate,
24771 -- but good enough for the warning.
24773 ----------------------------
24774 -- Has_One_Matching_Field --
24775 ----------------------------
24777 function Has_One_Matching_Field
return Boolean is
24781 Matching_Field
:= Empty
;
24783 if Is_Array_Type
(Expec_Type
)
24784 and then Number_Dimensions
(Expec_Type
) = 1
24785 and then Covers
(Etype
(Component_Type
(Expec_Type
)), Found_Type
)
24787 -- Use type name if available. This excludes multidimensional
24788 -- arrays and anonymous arrays.
24790 if Comes_From_Source
(Expec_Type
) then
24791 Matching_Field
:= Expec_Type
;
24793 -- For an assignment, use name of target
24795 elsif Nkind
(Parent
(Expr
)) = N_Assignment_Statement
24796 and then Is_Entity_Name
(Name
(Parent
(Expr
)))
24798 Matching_Field
:= Entity
(Name
(Parent
(Expr
)));
24803 elsif not Is_Record_Type
(Expec_Type
) then
24807 E
:= First_Entity
(Expec_Type
);
24812 elsif not Ekind_In
(E
, E_Discriminant
, E_Component
)
24813 or else Nam_In
(Chars
(E
), Name_uTag
, Name_uParent
)
24822 if not Covers
(Etype
(E
), Found_Type
) then
24825 elsif Present
(Next_Entity
(E
))
24826 and then (Ekind
(E
) = E_Component
24827 or else Ekind
(Next_Entity
(E
)) = E_Discriminant
)
24832 Matching_Field
:= E
;
24836 end Has_One_Matching_Field
;
24838 -- Start of processing for Wrong_Type
24841 -- Don't output message if either type is Any_Type, or if a message
24842 -- has already been posted for this node. We need to do the latter
24843 -- check explicitly (it is ordinarily done in Errout), because we
24844 -- are using ! to force the output of the error messages.
24846 if Expec_Type
= Any_Type
24847 or else Found_Type
= Any_Type
24848 or else Error_Posted
(Expr
)
24852 -- If one of the types is a Taft-Amendment type and the other it its
24853 -- completion, it must be an illegal use of a TAT in the spec, for
24854 -- which an error was already emitted. Avoid cascaded errors.
24856 elsif Is_Incomplete_Type
(Expec_Type
)
24857 and then Has_Completion_In_Body
(Expec_Type
)
24858 and then Full_View
(Expec_Type
) = Etype
(Expr
)
24862 elsif Is_Incomplete_Type
(Etype
(Expr
))
24863 and then Has_Completion_In_Body
(Etype
(Expr
))
24864 and then Full_View
(Etype
(Expr
)) = Expec_Type
24868 -- In an instance, there is an ongoing problem with completion of
24869 -- type derived from private types. Their structure is what Gigi
24870 -- expects, but the Etype is the parent type rather than the
24871 -- derived private type itself. Do not flag error in this case. The
24872 -- private completion is an entity without a parent, like an Itype.
24873 -- Similarly, full and partial views may be incorrect in the instance.
24874 -- There is no simple way to insure that it is consistent ???
24876 -- A similar view discrepancy can happen in an inlined body, for the
24877 -- same reason: inserted body may be outside of the original package
24878 -- and only partial views are visible at the point of insertion.
24880 elsif In_Instance
or else In_Inlined_Body
then
24881 if Etype
(Etype
(Expr
)) = Etype
(Expected_Type
)
24883 (Has_Private_Declaration
(Expected_Type
)
24884 or else Has_Private_Declaration
(Etype
(Expr
)))
24885 and then No
(Parent
(Expected_Type
))
24889 elsif Nkind
(Parent
(Expr
)) = N_Qualified_Expression
24890 and then Entity
(Subtype_Mark
(Parent
(Expr
))) = Expected_Type
24894 elsif Is_Private_Type
(Expected_Type
)
24895 and then Present
(Full_View
(Expected_Type
))
24896 and then Covers
(Full_View
(Expected_Type
), Etype
(Expr
))
24900 -- Conversely, type of expression may be the private one
24902 elsif Is_Private_Type
(Base_Type
(Etype
(Expr
)))
24903 and then Full_View
(Base_Type
(Etype
(Expr
))) = Expected_Type
24909 -- An interesting special check. If the expression is parenthesized
24910 -- and its type corresponds to the type of the sole component of the
24911 -- expected record type, or to the component type of the expected one
24912 -- dimensional array type, then assume we have a bad aggregate attempt.
24914 if Nkind
(Expr
) in N_Subexpr
24915 and then Paren_Count
(Expr
) /= 0
24916 and then Has_One_Matching_Field
24918 Error_Msg_N
("positional aggregate cannot have one component", Expr
);
24920 if Present
(Matching_Field
) then
24921 if Is_Array_Type
(Expec_Type
) then
24923 ("\write instead `&''First ='> ...`", Expr
, Matching_Field
);
24926 ("\write instead `& ='> ...`", Expr
, Matching_Field
);
24930 -- Another special check, if we are looking for a pool-specific access
24931 -- type and we found an E_Access_Attribute_Type, then we have the case
24932 -- of an Access attribute being used in a context which needs a pool-
24933 -- specific type, which is never allowed. The one extra check we make
24934 -- is that the expected designated type covers the Found_Type.
24936 elsif Is_Access_Type
(Expec_Type
)
24937 and then Ekind
(Found_Type
) = E_Access_Attribute_Type
24938 and then Ekind
(Base_Type
(Expec_Type
)) /= E_General_Access_Type
24939 and then Ekind
(Base_Type
(Expec_Type
)) /= E_Anonymous_Access_Type
24941 (Designated_Type
(Expec_Type
), Designated_Type
(Found_Type
))
24943 Error_Msg_N
-- CODEFIX
24944 ("result must be general access type!", Expr
);
24945 Error_Msg_NE
-- CODEFIX
24946 ("add ALL to }!", Expr
, Expec_Type
);
24948 -- Another special check, if the expected type is an integer type,
24949 -- but the expression is of type System.Address, and the parent is
24950 -- an addition or subtraction operation whose left operand is the
24951 -- expression in question and whose right operand is of an integral
24952 -- type, then this is an attempt at address arithmetic, so give
24953 -- appropriate message.
24955 elsif Is_Integer_Type
(Expec_Type
)
24956 and then Is_RTE
(Found_Type
, RE_Address
)
24957 and then Nkind_In
(Parent
(Expr
), N_Op_Add
, N_Op_Subtract
)
24958 and then Expr
= Left_Opnd
(Parent
(Expr
))
24959 and then Is_Integer_Type
(Etype
(Right_Opnd
(Parent
(Expr
))))
24962 ("address arithmetic not predefined in package System",
24965 ("\possible missing with/use of System.Storage_Elements",
24969 -- If the expected type is an anonymous access type, as for access
24970 -- parameters and discriminants, the error is on the designated types.
24972 elsif Ekind
(Expec_Type
) = E_Anonymous_Access_Type
then
24973 if Comes_From_Source
(Expec_Type
) then
24974 Error_Msg_NE
("expected}!", Expr
, Expec_Type
);
24977 ("expected an access type with designated}",
24978 Expr
, Designated_Type
(Expec_Type
));
24981 if Is_Access_Type
(Found_Type
)
24982 and then not Comes_From_Source
(Found_Type
)
24985 ("\\found an access type with designated}!",
24986 Expr
, Designated_Type
(Found_Type
));
24988 if From_Limited_With
(Found_Type
) then
24989 Error_Msg_NE
("\\found incomplete}!", Expr
, Found_Type
);
24990 Error_Msg_Qual_Level
:= 99;
24991 Error_Msg_NE
-- CODEFIX
24992 ("\\missing `WITH &;", Expr
, Scope
(Found_Type
));
24993 Error_Msg_Qual_Level
:= 0;
24995 Error_Msg_NE
("found}!", Expr
, Found_Type
);
24999 -- Normal case of one type found, some other type expected
25002 -- If the names of the two types are the same, see if some number
25003 -- of levels of qualification will help. Don't try more than three
25004 -- levels, and if we get to standard, it's no use (and probably
25005 -- represents an error in the compiler) Also do not bother with
25006 -- internal scope names.
25009 Expec_Scope
: Entity_Id
;
25010 Found_Scope
: Entity_Id
;
25013 Expec_Scope
:= Expec_Type
;
25014 Found_Scope
:= Found_Type
;
25016 for Levels
in Nat
range 0 .. 3 loop
25017 if Chars
(Expec_Scope
) /= Chars
(Found_Scope
) then
25018 Error_Msg_Qual_Level
:= Levels
;
25022 Expec_Scope
:= Scope
(Expec_Scope
);
25023 Found_Scope
:= Scope
(Found_Scope
);
25025 exit when Expec_Scope
= Standard_Standard
25026 or else Found_Scope
= Standard_Standard
25027 or else not Comes_From_Source
(Expec_Scope
)
25028 or else not Comes_From_Source
(Found_Scope
);
25032 if Is_Record_Type
(Expec_Type
)
25033 and then Present
(Corresponding_Remote_Type
(Expec_Type
))
25035 Error_Msg_NE
("expected}!", Expr
,
25036 Corresponding_Remote_Type
(Expec_Type
));
25038 Error_Msg_NE
("expected}!", Expr
, Expec_Type
);
25041 if Is_Entity_Name
(Expr
)
25042 and then Is_Package_Or_Generic_Package
(Entity
(Expr
))
25044 Error_Msg_N
("\\found package name!", Expr
);
25046 elsif Is_Entity_Name
(Expr
)
25047 and then Ekind_In
(Entity
(Expr
), E_Procedure
, E_Generic_Procedure
)
25049 if Ekind
(Expec_Type
) = E_Access_Subprogram_Type
then
25051 ("found procedure name, possibly missing Access attribute!",
25055 ("\\found procedure name instead of function!", Expr
);
25058 elsif Nkind
(Expr
) = N_Function_Call
25059 and then Ekind
(Expec_Type
) = E_Access_Subprogram_Type
25060 and then Etype
(Designated_Type
(Expec_Type
)) = Etype
(Expr
)
25061 and then No
(Parameter_Associations
(Expr
))
25064 ("found function name, possibly missing Access attribute!",
25067 -- Catch common error: a prefix or infix operator which is not
25068 -- directly visible because the type isn't.
25070 elsif Nkind
(Expr
) in N_Op
25071 and then Is_Overloaded
(Expr
)
25072 and then not Is_Immediately_Visible
(Expec_Type
)
25073 and then not Is_Potentially_Use_Visible
(Expec_Type
)
25074 and then not In_Use
(Expec_Type
)
25075 and then Has_Compatible_Type
(Right_Opnd
(Expr
), Expec_Type
)
25078 ("operator of the type is not directly visible!", Expr
);
25080 elsif Ekind
(Found_Type
) = E_Void
25081 and then Present
(Parent
(Found_Type
))
25082 and then Nkind
(Parent
(Found_Type
)) = N_Full_Type_Declaration
25084 Error_Msg_NE
("\\found premature usage of}!", Expr
, Found_Type
);
25087 Error_Msg_NE
("\\found}!", Expr
, Found_Type
);
25090 -- A special check for cases like M1 and M2 = 0 where M1 and M2 are
25091 -- of the same modular type, and (M1 and M2) = 0 was intended.
25093 if Expec_Type
= Standard_Boolean
25094 and then Is_Modular_Integer_Type
(Found_Type
)
25095 and then Nkind_In
(Parent
(Expr
), N_Op_And
, N_Op_Or
, N_Op_Xor
)
25096 and then Nkind
(Right_Opnd
(Parent
(Expr
))) in N_Op_Compare
25099 Op
: constant Node_Id
:= Right_Opnd
(Parent
(Expr
));
25100 L
: constant Node_Id
:= Left_Opnd
(Op
);
25101 R
: constant Node_Id
:= Right_Opnd
(Op
);
25104 -- The case for the message is when the left operand of the
25105 -- comparison is the same modular type, or when it is an
25106 -- integer literal (or other universal integer expression),
25107 -- which would have been typed as the modular type if the
25108 -- parens had been there.
25110 if (Etype
(L
) = Found_Type
25112 Etype
(L
) = Universal_Integer
)
25113 and then Is_Integer_Type
(Etype
(R
))
25116 ("\\possible missing parens for modular operation", Expr
);
25121 -- Reset error message qualification indication
25123 Error_Msg_Qual_Level
:= 0;
25127 --------------------------------
25128 -- Yields_Synchronized_Object --
25129 --------------------------------
25131 function Yields_Synchronized_Object
(Typ
: Entity_Id
) return Boolean is
25132 Has_Sync_Comp
: Boolean := False;
25136 -- An array type yields a synchronized object if its component type
25137 -- yields a synchronized object.
25139 if Is_Array_Type
(Typ
) then
25140 return Yields_Synchronized_Object
(Component_Type
(Typ
));
25142 -- A descendant of type Ada.Synchronous_Task_Control.Suspension_Object
25143 -- yields a synchronized object by default.
25145 elsif Is_Descendant_Of_Suspension_Object
(Typ
) then
25148 -- A protected type yields a synchronized object by default
25150 elsif Is_Protected_Type
(Typ
) then
25153 -- A record type or type extension yields a synchronized object when its
25154 -- discriminants (if any) lack default values and all components are of
25155 -- a type that yelds a synchronized object.
25157 elsif Is_Record_Type
(Typ
) then
25159 -- Inspect all entities defined in the scope of the type, looking for
25160 -- components of a type that does not yeld a synchronized object or
25161 -- for discriminants with default values.
25163 Id
:= First_Entity
(Typ
);
25164 while Present
(Id
) loop
25165 if Comes_From_Source
(Id
) then
25166 if Ekind
(Id
) = E_Component
then
25167 if Yields_Synchronized_Object
(Etype
(Id
)) then
25168 Has_Sync_Comp
:= True;
25170 -- The component does not yield a synchronized object
25176 elsif Ekind
(Id
) = E_Discriminant
25177 and then Present
(Expression
(Parent
(Id
)))
25186 -- Ensure that the parent type of a type extension yields a
25187 -- synchronized object.
25189 if Etype
(Typ
) /= Typ
25190 and then not Yields_Synchronized_Object
(Etype
(Typ
))
25195 -- If we get here, then all discriminants lack default values and all
25196 -- components are of a type that yields a synchronized object.
25198 return Has_Sync_Comp
;
25200 -- A synchronized interface type yields a synchronized object by default
25202 elsif Is_Synchronized_Interface
(Typ
) then
25205 -- A task type yelds a synchronized object by default
25207 elsif Is_Task_Type
(Typ
) then
25210 -- Otherwise the type does not yield a synchronized object
25215 end Yields_Synchronized_Object
;
25217 ---------------------------
25218 -- Yields_Universal_Type --
25219 ---------------------------
25221 function Yields_Universal_Type
(N
: Node_Id
) return Boolean is
25223 -- Integer and real literals are of a universal type
25225 if Nkind_In
(N
, N_Integer_Literal
, N_Real_Literal
) then
25228 -- The values of certain attributes are of a universal type
25230 elsif Nkind
(N
) = N_Attribute_Reference
then
25232 Universal_Type_Attribute
(Get_Attribute_Id
(Attribute_Name
(N
)));
25234 -- ??? There are possibly other cases to consider
25239 end Yields_Universal_Type
;
25242 Erroutc
.Subprogram_Name_Ptr
:= Subprogram_Name
'Access;