1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2014, 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 Aspects
; use Aspects
;
27 with Atree
; use Atree
;
28 with Casing
; use Casing
;
29 with Checks
; use Checks
;
30 with Debug
; use Debug
;
31 with Elists
; use Elists
;
32 with Errout
; use Errout
;
33 with Exp_Ch11
; use Exp_Ch11
;
34 with Exp_Disp
; use Exp_Disp
;
35 with Exp_Util
; use Exp_Util
;
36 with Fname
; use Fname
;
37 with Freeze
; use Freeze
;
39 with Lib
.Xref
; use Lib
.Xref
;
40 with Namet
.Sp
; use Namet
.Sp
;
41 with Nlists
; use Nlists
;
42 with Nmake
; use Nmake
;
43 with Output
; use Output
;
44 with Restrict
; use Restrict
;
45 with Rident
; use Rident
;
46 with Rtsfind
; use Rtsfind
;
48 with Sem_Aux
; use Sem_Aux
;
49 with Sem_Attr
; use Sem_Attr
;
50 with Sem_Ch8
; use Sem_Ch8
;
51 with Sem_Ch13
; use Sem_Ch13
;
52 with Sem_Disp
; use Sem_Disp
;
53 with Sem_Eval
; use Sem_Eval
;
54 with Sem_Prag
; use Sem_Prag
;
55 with Sem_Res
; use Sem_Res
;
56 with Sem_Warn
; use Sem_Warn
;
57 with Sem_Type
; use Sem_Type
;
58 with Sinfo
; use Sinfo
;
59 with Sinput
; use Sinput
;
60 with Stand
; use Stand
;
62 with Stringt
; use Stringt
;
63 with Targparm
; use Targparm
;
64 with Tbuild
; use Tbuild
;
65 with Ttypes
; use Ttypes
;
66 with Uname
; use Uname
;
68 with GNAT
.HTable
; use GNAT
.HTable
;
70 package body Sem_Util
is
72 ----------------------------------------
73 -- Global_Variables for New_Copy_Tree --
74 ----------------------------------------
76 -- These global variables are used by New_Copy_Tree. See description of the
77 -- body of this subprogram for details. Global variables can be safely used
78 -- by New_Copy_Tree, since there is no case of a recursive call from the
79 -- processing inside New_Copy_Tree.
81 NCT_Hash_Threshold
: constant := 20;
82 -- If there are more than this number of pairs of entries in the map, then
83 -- Hash_Tables_Used will be set, and the hash tables will be initialized
84 -- and used for the searches.
86 NCT_Hash_Tables_Used
: Boolean := False;
87 -- Set to True if hash tables are in use
89 NCT_Table_Entries
: Nat
:= 0;
90 -- Count entries in table to see if threshold is reached
92 NCT_Hash_Table_Setup
: Boolean := False;
93 -- Set to True if hash table contains data. We set this True if we setup
94 -- the hash table with data, and leave it set permanently from then on,
95 -- this is a signal that second and subsequent users of the hash table
96 -- must clear the old entries before reuse.
98 subtype NCT_Header_Num
is Int
range 0 .. 511;
99 -- Defines range of headers in hash tables (512 headers)
101 -----------------------
102 -- Local Subprograms --
103 -----------------------
105 function Build_Component_Subtype
108 T
: Entity_Id
) return Node_Id
;
109 -- This function builds the subtype for Build_Actual_Subtype_Of_Component
110 -- and Build_Discriminal_Subtype_Of_Component. C is a list of constraints,
111 -- Loc is the source location, T is the original subtype.
113 function Is_Fully_Initialized_Variant
(Typ
: Entity_Id
) return Boolean;
114 -- Subsidiary to Is_Fully_Initialized_Type. For an unconstrained type
115 -- with discriminants whose default values are static, examine only the
116 -- components in the selected variant to determine whether all of them
119 function Has_Enabled_Property
120 (Item_Id
: Entity_Id
;
121 Property
: Name_Id
) return Boolean;
122 -- Subsidiary to routines Async_xxx_Enabled and Effective_xxx_Enabled.
123 -- Determine whether an abstract state or a variable denoted by entity
124 -- Item_Id has enabled property Property.
126 function Has_Null_Extension
(T
: Entity_Id
) return Boolean;
127 -- T is a derived tagged type. Check whether the type extension is null.
128 -- If the parent type is fully initialized, T can be treated as such.
130 ------------------------------
131 -- Abstract_Interface_List --
132 ------------------------------
134 function Abstract_Interface_List
(Typ
: Entity_Id
) return List_Id
is
138 if Is_Concurrent_Type
(Typ
) then
140 -- If we are dealing with a synchronized subtype, go to the base
141 -- type, whose declaration has the interface list.
143 -- Shouldn't this be Declaration_Node???
145 Nod
:= Parent
(Base_Type
(Typ
));
147 if Nkind
(Nod
) = N_Full_Type_Declaration
then
151 elsif Ekind
(Typ
) = E_Record_Type_With_Private
then
152 if Nkind
(Parent
(Typ
)) = N_Full_Type_Declaration
then
153 Nod
:= Type_Definition
(Parent
(Typ
));
155 elsif Nkind
(Parent
(Typ
)) = N_Private_Type_Declaration
then
156 if Present
(Full_View
(Typ
))
158 Nkind
(Parent
(Full_View
(Typ
))) = N_Full_Type_Declaration
160 Nod
:= Type_Definition
(Parent
(Full_View
(Typ
)));
162 -- If the full-view is not available we cannot do anything else
163 -- here (the source has errors).
169 -- Support for generic formals with interfaces is still missing ???
171 elsif Nkind
(Parent
(Typ
)) = N_Formal_Type_Declaration
then
176 (Nkind
(Parent
(Typ
)) = N_Private_Extension_Declaration
);
180 elsif Ekind
(Typ
) = E_Record_Subtype
then
181 Nod
:= Type_Definition
(Parent
(Etype
(Typ
)));
183 elsif Ekind
(Typ
) = E_Record_Subtype_With_Private
then
185 -- Recurse, because parent may still be a private extension. Also
186 -- note that the full view of the subtype or the full view of its
187 -- base type may (both) be unavailable.
189 return Abstract_Interface_List
(Etype
(Typ
));
191 else pragma Assert
((Ekind
(Typ
)) = E_Record_Type
);
192 if Nkind
(Parent
(Typ
)) = N_Formal_Type_Declaration
then
193 Nod
:= Formal_Type_Definition
(Parent
(Typ
));
195 Nod
:= Type_Definition
(Parent
(Typ
));
199 return Interface_List
(Nod
);
200 end Abstract_Interface_List
;
202 --------------------------------
203 -- Add_Access_Type_To_Process --
204 --------------------------------
206 procedure Add_Access_Type_To_Process
(E
: Entity_Id
; A
: Entity_Id
) is
210 Ensure_Freeze_Node
(E
);
211 L
:= Access_Types_To_Process
(Freeze_Node
(E
));
215 Set_Access_Types_To_Process
(Freeze_Node
(E
), L
);
219 end Add_Access_Type_To_Process
;
221 --------------------------
222 -- Add_Block_Identifier --
223 --------------------------
225 procedure Add_Block_Identifier
(N
: Node_Id
; Id
: out Entity_Id
) is
226 Loc
: constant Source_Ptr
:= Sloc
(N
);
229 pragma Assert
(Nkind
(N
) = N_Block_Statement
);
231 -- The block already has a label, return its entity
233 if Present
(Identifier
(N
)) then
234 Id
:= Entity
(Identifier
(N
));
236 -- Create a new block label and set its attributes
239 Id
:= New_Internal_Entity
(E_Block
, Current_Scope
, Loc
, 'B');
240 Set_Etype
(Id
, Standard_Void_Type
);
243 Set_Identifier
(N
, New_Occurrence_Of
(Id
, Loc
));
244 Set_Block_Node
(Id
, Identifier
(N
));
246 end Add_Block_Identifier
;
248 -----------------------
249 -- Add_Contract_Item --
250 -----------------------
252 procedure Add_Contract_Item
(Prag
: Node_Id
; Id
: Entity_Id
) is
253 Items
: constant Node_Id
:= Contract
(Id
);
255 procedure Add_Classification
;
256 -- Prepend Prag to the list of classifications
258 procedure Add_Contract_Test_Case
;
259 -- Prepend Prag to the list of contract and test cases
261 procedure Add_Pre_Post_Condition
;
262 -- Prepend Prag to the list of pre- and postconditions
264 ------------------------
265 -- Add_Classification --
266 ------------------------
268 procedure Add_Classification
is
270 Set_Next_Pragma
(Prag
, Classifications
(Items
));
271 Set_Classifications
(Items
, Prag
);
272 end Add_Classification
;
274 ----------------------------
275 -- Add_Contract_Test_Case --
276 ----------------------------
278 procedure Add_Contract_Test_Case
is
280 Set_Next_Pragma
(Prag
, Contract_Test_Cases
(Items
));
281 Set_Contract_Test_Cases
(Items
, Prag
);
282 end Add_Contract_Test_Case
;
284 ----------------------------
285 -- Add_Pre_Post_Condition --
286 ----------------------------
288 procedure Add_Pre_Post_Condition
is
290 Set_Next_Pragma
(Prag
, Pre_Post_Conditions
(Items
));
291 Set_Pre_Post_Conditions
(Items
, Prag
);
292 end Add_Pre_Post_Condition
;
299 -- Start of processing for Add_Contract_Item
302 -- The related context must have a contract and the item to be added
305 pragma Assert
(Present
(Items
));
306 pragma Assert
(Nkind
(Prag
) = N_Pragma
);
308 Nam
:= Original_Aspect_Name
(Prag
);
310 -- Contract items related to [generic] packages or instantiations. The
311 -- applicable pragmas are:
315 -- Part_Of (instantiation only)
317 if Ekind_In
(Id
, E_Generic_Package
, E_Package
) then
318 if Nam_In
(Nam
, Name_Abstract_State
,
319 Name_Initial_Condition
,
324 -- Indicator Part_Of must be associated with a package instantiation
326 elsif Nam
= Name_Part_Of
and then Is_Generic_Instance
(Id
) then
329 -- The pragma is not a proper contract item
335 -- Contract items related to package bodies. The applicable pragmas are:
338 elsif Ekind
(Id
) = E_Package_Body
then
339 if Nam
= Name_Refined_State
then
342 -- The pragma is not a proper contract item
348 -- Contract items related to subprogram or entry declarations. The
349 -- applicable pragmas are:
352 -- Extensions_Visible
360 elsif Ekind_In
(Id
, E_Entry
, E_Entry_Family
)
361 or else Is_Generic_Subprogram
(Id
)
362 or else Is_Subprogram
(Id
)
364 if Nam_In
(Nam
, Name_Pre
,
371 -- Before we add a precondition or postcondition to the list, make
372 -- sure we do not have a disallowed duplicate, which can happen if
373 -- we use a pragma for Pre[_Class] or Post[_Class] instead of the
374 -- corresponding aspect.
376 if not From_Aspect_Specification
(Prag
)
377 and then Nam_In
(Nam
, Name_Pre
,
382 PPC
:= Pre_Post_Conditions
(Items
);
383 while Present
(PPC
) loop
384 if not Split_PPC
(PPC
)
385 and then Original_Aspect_Name
(PPC
) = Nam
387 Error_Msg_Sloc
:= Sloc
(PPC
);
389 ("duplication of aspect for & given#", Prag
, Id
);
393 PPC
:= Next_Pragma
(PPC
);
397 Add_Pre_Post_Condition
;
399 elsif Nam_In
(Nam
, Name_Contract_Cases
, Name_Test_Case
) then
400 Add_Contract_Test_Case
;
402 elsif Nam_In
(Nam
, Name_Depends
,
403 Name_Extensions_Visible
,
408 -- The pragma is not a proper contract item
414 -- Contract items related to subprogram bodies. Applicable pragmas are:
419 elsif Ekind
(Id
) = E_Subprogram_Body
then
420 if Nam_In
(Nam
, Name_Refined_Depends
, Name_Refined_Global
) then
423 elsif Nam
= Name_Refined_Post
then
424 Add_Pre_Post_Condition
;
426 -- The pragma is not a proper contract item
432 -- Contract items related to variables. Applicable pragmas are:
439 elsif Ekind
(Id
) = E_Variable
then
440 if Nam_In
(Nam
, Name_Async_Readers
,
442 Name_Effective_Reads
,
443 Name_Effective_Writes
,
448 -- The pragma is not a proper contract item
454 end Add_Contract_Item
;
456 ----------------------------
457 -- Add_Global_Declaration --
458 ----------------------------
460 procedure Add_Global_Declaration
(N
: Node_Id
) is
461 Aux_Node
: constant Node_Id
:= Aux_Decls_Node
(Cunit
(Current_Sem_Unit
));
464 if No
(Declarations
(Aux_Node
)) then
465 Set_Declarations
(Aux_Node
, New_List
);
468 Append_To
(Declarations
(Aux_Node
), N
);
470 end Add_Global_Declaration
;
472 --------------------------------
473 -- Address_Integer_Convert_OK --
474 --------------------------------
476 function Address_Integer_Convert_OK
(T1
, T2
: Entity_Id
) return Boolean is
478 if Allow_Integer_Address
479 and then ((Is_Descendent_Of_Address
(T1
)
480 and then Is_Private_Type
(T1
)
481 and then Is_Integer_Type
(T2
))
483 (Is_Descendent_Of_Address
(T2
)
484 and then Is_Private_Type
(T2
)
485 and then Is_Integer_Type
(T1
)))
491 end Address_Integer_Convert_OK
;
497 -- For now, just 8/16/32/64. but analyze later if AAMP is special???
499 function Addressable
(V
: Uint
) return Boolean is
501 return V
= Uint_8
or else
507 function Addressable
(V
: Int
) return Boolean is
515 ---------------------------------
516 -- Aggregate_Constraint_Checks --
517 ---------------------------------
519 procedure Aggregate_Constraint_Checks
521 Check_Typ
: Entity_Id
)
523 Exp_Typ
: constant Entity_Id
:= Etype
(Exp
);
526 if Raises_Constraint_Error
(Exp
) then
530 -- Ada 2005 (AI-230): Generate a conversion to an anonymous access
531 -- component's type to force the appropriate accessibility checks.
533 -- Ada 2005 (AI-231): Generate conversion to the null-excluding
534 -- type to force the corresponding run-time check
536 if Is_Access_Type
(Check_Typ
)
537 and then ((Is_Local_Anonymous_Access
(Check_Typ
))
538 or else (Can_Never_Be_Null
(Check_Typ
)
539 and then not Can_Never_Be_Null
(Exp_Typ
)))
541 Rewrite
(Exp
, Convert_To
(Check_Typ
, Relocate_Node
(Exp
)));
542 Analyze_And_Resolve
(Exp
, Check_Typ
);
543 Check_Unset_Reference
(Exp
);
546 -- This is really expansion activity, so make sure that expansion is
547 -- on and is allowed. In GNATprove mode, we also want check flags to
548 -- be added in the tree, so that the formal verification can rely on
549 -- those to be present. In GNATprove mode for formal verification, some
550 -- treatment typically only done during expansion needs to be performed
551 -- on the tree, but it should not be applied inside generics. Otherwise,
552 -- this breaks the name resolution mechanism for generic instances.
554 if not Expander_Active
555 and (Inside_A_Generic
or not Full_Analysis
or not GNATprove_Mode
)
560 -- First check if we have to insert discriminant checks
562 if Has_Discriminants
(Exp_Typ
) then
563 Apply_Discriminant_Check
(Exp
, Check_Typ
);
565 -- Next emit length checks for array aggregates
567 elsif Is_Array_Type
(Exp_Typ
) then
568 Apply_Length_Check
(Exp
, Check_Typ
);
570 -- Finally emit scalar and string checks. If we are dealing with a
571 -- scalar literal we need to check by hand because the Etype of
572 -- literals is not necessarily correct.
574 elsif Is_Scalar_Type
(Exp_Typ
)
575 and then Compile_Time_Known_Value
(Exp
)
577 if Is_Out_Of_Range
(Exp
, Base_Type
(Check_Typ
)) then
578 Apply_Compile_Time_Constraint_Error
579 (Exp
, "value not in range of}??", CE_Range_Check_Failed
,
580 Ent
=> Base_Type
(Check_Typ
),
581 Typ
=> Base_Type
(Check_Typ
));
583 elsif Is_Out_Of_Range
(Exp
, Check_Typ
) then
584 Apply_Compile_Time_Constraint_Error
585 (Exp
, "value not in range of}??", CE_Range_Check_Failed
,
589 elsif not Range_Checks_Suppressed
(Check_Typ
) then
590 Apply_Scalar_Range_Check
(Exp
, Check_Typ
);
593 -- Verify that target type is also scalar, to prevent view anomalies
594 -- in instantiations.
596 elsif (Is_Scalar_Type
(Exp_Typ
)
597 or else Nkind
(Exp
) = N_String_Literal
)
598 and then Is_Scalar_Type
(Check_Typ
)
599 and then Exp_Typ
/= Check_Typ
601 if Is_Entity_Name
(Exp
)
602 and then Ekind
(Entity
(Exp
)) = E_Constant
604 -- If expression is a constant, it is worthwhile checking whether
605 -- it is a bound of the type.
607 if (Is_Entity_Name
(Type_Low_Bound
(Check_Typ
))
608 and then Entity
(Exp
) = Entity
(Type_Low_Bound
(Check_Typ
)))
610 (Is_Entity_Name
(Type_High_Bound
(Check_Typ
))
611 and then Entity
(Exp
) = Entity
(Type_High_Bound
(Check_Typ
)))
616 Rewrite
(Exp
, Convert_To
(Check_Typ
, Relocate_Node
(Exp
)));
617 Analyze_And_Resolve
(Exp
, Check_Typ
);
618 Check_Unset_Reference
(Exp
);
621 -- Could use a comment on this case ???
624 Rewrite
(Exp
, Convert_To
(Check_Typ
, Relocate_Node
(Exp
)));
625 Analyze_And_Resolve
(Exp
, Check_Typ
);
626 Check_Unset_Reference
(Exp
);
630 end Aggregate_Constraint_Checks
;
632 -----------------------
633 -- Alignment_In_Bits --
634 -----------------------
636 function Alignment_In_Bits
(E
: Entity_Id
) return Uint
is
638 return Alignment
(E
) * System_Storage_Unit
;
639 end Alignment_In_Bits
;
641 ---------------------------------
642 -- Append_Inherited_Subprogram --
643 ---------------------------------
645 procedure Append_Inherited_Subprogram
(S
: Entity_Id
) is
646 Par
: constant Entity_Id
:= Alias
(S
);
647 -- The parent subprogram
649 Scop
: constant Entity_Id
:= Scope
(Par
);
650 -- The scope of definition of the parent subprogram
652 Typ
: constant Entity_Id
:= Defining_Entity
(Parent
(S
));
653 -- The derived type of which S is a primitive operation
659 if Ekind
(Current_Scope
) = E_Package
660 and then In_Private_Part
(Current_Scope
)
661 and then Has_Private_Declaration
(Typ
)
662 and then Is_Tagged_Type
(Typ
)
663 and then Scop
= Current_Scope
665 -- The inherited operation is available at the earliest place after
666 -- the derived type declaration ( RM 7.3.1 (6/1)). This is only
667 -- relevant for type extensions. If the parent operation appears
668 -- after the type extension, the operation is not visible.
671 (Visible_Declarations
672 (Package_Specification
(Current_Scope
)));
673 while Present
(Decl
) loop
674 if Nkind
(Decl
) = N_Private_Extension_Declaration
675 and then Defining_Entity
(Decl
) = Typ
677 if Sloc
(Decl
) > Sloc
(Par
) then
678 Next_E
:= Next_Entity
(Par
);
679 Set_Next_Entity
(Par
, S
);
680 Set_Next_Entity
(S
, Next_E
);
692 -- If partial view is not a type extension, or it appears before the
693 -- subprogram declaration, insert normally at end of entity list.
695 Append_Entity
(S
, Current_Scope
);
696 end Append_Inherited_Subprogram
;
698 -----------------------------------------
699 -- Apply_Compile_Time_Constraint_Error --
700 -----------------------------------------
702 procedure Apply_Compile_Time_Constraint_Error
705 Reason
: RT_Exception_Code
;
706 Ent
: Entity_Id
:= Empty
;
707 Typ
: Entity_Id
:= Empty
;
708 Loc
: Source_Ptr
:= No_Location
;
709 Rep
: Boolean := True;
710 Warn
: Boolean := False)
712 Stat
: constant Boolean := Is_Static_Expression
(N
);
713 R_Stat
: constant Node_Id
:=
714 Make_Raise_Constraint_Error
(Sloc
(N
), Reason
=> Reason
);
725 (Compile_Time_Constraint_Error
(N
, Msg
, Ent
, Loc
, Warn
=> Warn
));
731 -- Now we replace the node by an N_Raise_Constraint_Error node
732 -- This does not need reanalyzing, so set it as analyzed now.
735 Set_Analyzed
(N
, True);
738 Set_Raises_Constraint_Error
(N
);
740 -- Now deal with possible local raise handling
742 Possible_Local_Raise
(N
, Standard_Constraint_Error
);
744 -- If the original expression was marked as static, the result is
745 -- still marked as static, but the Raises_Constraint_Error flag is
746 -- always set so that further static evaluation is not attempted.
749 Set_Is_Static_Expression
(N
);
751 end Apply_Compile_Time_Constraint_Error
;
753 ---------------------------
754 -- Async_Readers_Enabled --
755 ---------------------------
757 function Async_Readers_Enabled
(Id
: Entity_Id
) return Boolean is
759 return Has_Enabled_Property
(Id
, Name_Async_Readers
);
760 end Async_Readers_Enabled
;
762 ---------------------------
763 -- Async_Writers_Enabled --
764 ---------------------------
766 function Async_Writers_Enabled
(Id
: Entity_Id
) return Boolean is
768 return Has_Enabled_Property
(Id
, Name_Async_Writers
);
769 end Async_Writers_Enabled
;
771 --------------------------------------
772 -- Available_Full_View_Of_Component --
773 --------------------------------------
775 function Available_Full_View_Of_Component
(T
: Entity_Id
) return Boolean is
776 ST
: constant Entity_Id
:= Scope
(T
);
777 SCT
: constant Entity_Id
:= Scope
(Component_Type
(T
));
779 return In_Open_Scopes
(ST
)
780 and then In_Open_Scopes
(SCT
)
781 and then Scope_Depth
(ST
) >= Scope_Depth
(SCT
);
782 end Available_Full_View_Of_Component
;
788 procedure Bad_Attribute
791 Warn
: Boolean := False)
794 Error_Msg_Warn
:= Warn
;
795 Error_Msg_N
("unrecognized attribute&<<", N
);
797 -- Check for possible misspelling
799 Error_Msg_Name_1
:= First_Attribute_Name
;
800 while Error_Msg_Name_1
<= Last_Attribute_Name
loop
801 if Is_Bad_Spelling_Of
(Nam
, Error_Msg_Name_1
) then
802 Error_Msg_N
-- CODEFIX
803 ("\possible misspelling of %<<", N
);
807 Error_Msg_Name_1
:= Error_Msg_Name_1
+ 1;
811 --------------------------------
812 -- Bad_Predicated_Subtype_Use --
813 --------------------------------
815 procedure Bad_Predicated_Subtype_Use
819 Suggest_Static
: Boolean := False)
824 -- Avoid cascaded errors
826 if Error_Posted
(N
) then
830 if Inside_A_Generic
then
831 Gen
:= Current_Scope
;
832 while Present
(Gen
) and then Ekind
(Gen
) /= E_Generic_Package
loop
840 if Is_Generic_Formal
(Typ
) and then Is_Discrete_Type
(Typ
) then
841 Set_No_Predicate_On_Actual
(Typ
);
844 elsif Has_Predicates
(Typ
) then
845 if Is_Generic_Actual_Type
(Typ
) then
847 -- The restriction on loop parameters is only that the type
848 -- should have no dynamic predicates.
850 if Nkind
(Parent
(N
)) = N_Loop_Parameter_Specification
851 and then not Has_Dynamic_Predicate_Aspect
(Typ
)
852 and then Is_OK_Static_Subtype
(Typ
)
857 Gen
:= Current_Scope
;
858 while not Is_Generic_Instance
(Gen
) loop
862 pragma Assert
(Present
(Gen
));
864 if Ekind
(Gen
) = E_Package
and then In_Package_Body
(Gen
) then
865 Error_Msg_Warn
:= SPARK_Mode
/= On
;
866 Error_Msg_FE
(Msg
& "<<", N
, Typ
);
867 Error_Msg_F
("\Program_Error [<<", N
);
870 Make_Raise_Program_Error
(Sloc
(N
),
871 Reason
=> PE_Bad_Predicated_Generic_Type
));
874 Error_Msg_FE
(Msg
& "<<", N
, Typ
);
878 Error_Msg_FE
(Msg
, N
, Typ
);
881 -- Emit an optional suggestion on how to remedy the error if the
882 -- context warrants it.
884 if Suggest_Static
and then Has_Static_Predicate
(Typ
) then
885 Error_Msg_FE
("\predicate of & should be marked static", N
, Typ
);
888 end Bad_Predicated_Subtype_Use
;
890 -----------------------------------------
891 -- Bad_Unordered_Enumeration_Reference --
892 -----------------------------------------
894 function Bad_Unordered_Enumeration_Reference
896 T
: Entity_Id
) return Boolean
899 return Is_Enumeration_Type
(T
)
900 and then Comes_From_Source
(N
)
901 and then Warn_On_Unordered_Enumeration_Type
902 and then not Has_Pragma_Ordered
(T
)
903 and then not In_Same_Extended_Unit
(N
, T
);
904 end Bad_Unordered_Enumeration_Reference
;
906 --------------------------
907 -- Build_Actual_Subtype --
908 --------------------------
910 function Build_Actual_Subtype
912 N
: Node_Or_Entity_Id
) return Node_Id
915 -- Normally Sloc (N), but may point to corresponding body in some cases
917 Constraints
: List_Id
;
923 Disc_Type
: Entity_Id
;
929 if Nkind
(N
) = N_Defining_Identifier
then
930 Obj
:= New_Occurrence_Of
(N
, Loc
);
932 -- If this is a formal parameter of a subprogram declaration, and
933 -- we are compiling the body, we want the declaration for the
934 -- actual subtype to carry the source position of the body, to
935 -- prevent anomalies in gdb when stepping through the code.
937 if Is_Formal
(N
) then
939 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Scope
(N
));
941 if Nkind
(Decl
) = N_Subprogram_Declaration
942 and then Present
(Corresponding_Body
(Decl
))
944 Loc
:= Sloc
(Corresponding_Body
(Decl
));
953 if Is_Array_Type
(T
) then
954 Constraints
:= New_List
;
955 for J
in 1 .. Number_Dimensions
(T
) loop
957 -- Build an array subtype declaration with the nominal subtype and
958 -- the bounds of the actual. Add the declaration in front of the
959 -- local declarations for the subprogram, for analysis before any
960 -- reference to the formal in the body.
963 Make_Attribute_Reference
(Loc
,
965 Duplicate_Subexpr_No_Checks
(Obj
, Name_Req
=> True),
966 Attribute_Name
=> Name_First
,
967 Expressions
=> New_List
(
968 Make_Integer_Literal
(Loc
, J
)));
971 Make_Attribute_Reference
(Loc
,
973 Duplicate_Subexpr_No_Checks
(Obj
, Name_Req
=> True),
974 Attribute_Name
=> Name_Last
,
975 Expressions
=> New_List
(
976 Make_Integer_Literal
(Loc
, J
)));
978 Append
(Make_Range
(Loc
, Lo
, Hi
), Constraints
);
981 -- If the type has unknown discriminants there is no constrained
982 -- subtype to build. This is never called for a formal or for a
983 -- lhs, so returning the type is ok ???
985 elsif Has_Unknown_Discriminants
(T
) then
989 Constraints
:= New_List
;
991 -- Type T is a generic derived type, inherit the discriminants from
994 if Is_Private_Type
(T
)
995 and then No
(Full_View
(T
))
997 -- T was flagged as an error if it was declared as a formal
998 -- derived type with known discriminants. In this case there
999 -- is no need to look at the parent type since T already carries
1000 -- its own discriminants.
1002 and then not Error_Posted
(T
)
1004 Disc_Type
:= Etype
(Base_Type
(T
));
1009 Discr
:= First_Discriminant
(Disc_Type
);
1010 while Present
(Discr
) loop
1011 Append_To
(Constraints
,
1012 Make_Selected_Component
(Loc
,
1014 Duplicate_Subexpr_No_Checks
(Obj
),
1015 Selector_Name
=> New_Occurrence_Of
(Discr
, Loc
)));
1016 Next_Discriminant
(Discr
);
1020 Subt
:= Make_Temporary
(Loc
, 'S', Related_Node
=> N
);
1021 Set_Is_Internal
(Subt
);
1024 Make_Subtype_Declaration
(Loc
,
1025 Defining_Identifier
=> Subt
,
1026 Subtype_Indication
=>
1027 Make_Subtype_Indication
(Loc
,
1028 Subtype_Mark
=> New_Occurrence_Of
(T
, Loc
),
1030 Make_Index_Or_Discriminant_Constraint
(Loc
,
1031 Constraints
=> Constraints
)));
1033 Mark_Rewrite_Insertion
(Decl
);
1035 end Build_Actual_Subtype
;
1037 ---------------------------------------
1038 -- Build_Actual_Subtype_Of_Component --
1039 ---------------------------------------
1041 function Build_Actual_Subtype_Of_Component
1043 N
: Node_Id
) return Node_Id
1045 Loc
: constant Source_Ptr
:= Sloc
(N
);
1046 P
: constant Node_Id
:= Prefix
(N
);
1049 Index_Typ
: Entity_Id
;
1051 Desig_Typ
: Entity_Id
;
1052 -- This is either a copy of T, or if T is an access type, then it is
1053 -- the directly designated type of this access type.
1055 function Build_Actual_Array_Constraint
return List_Id
;
1056 -- If one or more of the bounds of the component depends on
1057 -- discriminants, build actual constraint using the discriminants
1060 function Build_Actual_Record_Constraint
return List_Id
;
1061 -- Similar to previous one, for discriminated components constrained
1062 -- by the discriminant of the enclosing object.
1064 -----------------------------------
1065 -- Build_Actual_Array_Constraint --
1066 -----------------------------------
1068 function Build_Actual_Array_Constraint
return List_Id
is
1069 Constraints
: constant List_Id
:= New_List
;
1077 Indx
:= First_Index
(Desig_Typ
);
1078 while Present
(Indx
) loop
1079 Old_Lo
:= Type_Low_Bound
(Etype
(Indx
));
1080 Old_Hi
:= Type_High_Bound
(Etype
(Indx
));
1082 if Denotes_Discriminant
(Old_Lo
) then
1084 Make_Selected_Component
(Loc
,
1085 Prefix
=> New_Copy_Tree
(P
),
1086 Selector_Name
=> New_Occurrence_Of
(Entity
(Old_Lo
), Loc
));
1089 Lo
:= New_Copy_Tree
(Old_Lo
);
1091 -- The new bound will be reanalyzed in the enclosing
1092 -- declaration. For literal bounds that come from a type
1093 -- declaration, the type of the context must be imposed, so
1094 -- insure that analysis will take place. For non-universal
1095 -- types this is not strictly necessary.
1097 Set_Analyzed
(Lo
, False);
1100 if Denotes_Discriminant
(Old_Hi
) then
1102 Make_Selected_Component
(Loc
,
1103 Prefix
=> New_Copy_Tree
(P
),
1104 Selector_Name
=> New_Occurrence_Of
(Entity
(Old_Hi
), Loc
));
1107 Hi
:= New_Copy_Tree
(Old_Hi
);
1108 Set_Analyzed
(Hi
, False);
1111 Append
(Make_Range
(Loc
, Lo
, Hi
), Constraints
);
1116 end Build_Actual_Array_Constraint
;
1118 ------------------------------------
1119 -- Build_Actual_Record_Constraint --
1120 ------------------------------------
1122 function Build_Actual_Record_Constraint
return List_Id
is
1123 Constraints
: constant List_Id
:= New_List
;
1128 D
:= First_Elmt
(Discriminant_Constraint
(Desig_Typ
));
1129 while Present
(D
) loop
1130 if Denotes_Discriminant
(Node
(D
)) then
1131 D_Val
:= Make_Selected_Component
(Loc
,
1132 Prefix
=> New_Copy_Tree
(P
),
1133 Selector_Name
=> New_Occurrence_Of
(Entity
(Node
(D
)), Loc
));
1136 D_Val
:= New_Copy_Tree
(Node
(D
));
1139 Append
(D_Val
, Constraints
);
1144 end Build_Actual_Record_Constraint
;
1146 -- Start of processing for Build_Actual_Subtype_Of_Component
1149 -- Why the test for Spec_Expression mode here???
1151 if In_Spec_Expression
then
1154 -- More comments for the rest of this body would be good ???
1156 elsif Nkind
(N
) = N_Explicit_Dereference
then
1157 if Is_Composite_Type
(T
)
1158 and then not Is_Constrained
(T
)
1159 and then not (Is_Class_Wide_Type
(T
)
1160 and then Is_Constrained
(Root_Type
(T
)))
1161 and then not Has_Unknown_Discriminants
(T
)
1163 -- If the type of the dereference is already constrained, it is an
1166 if Is_Array_Type
(Etype
(N
))
1167 and then Is_Constrained
(Etype
(N
))
1171 Remove_Side_Effects
(P
);
1172 return Build_Actual_Subtype
(T
, N
);
1179 if Ekind
(T
) = E_Access_Subtype
then
1180 Desig_Typ
:= Designated_Type
(T
);
1185 if Ekind
(Desig_Typ
) = E_Array_Subtype
then
1186 Id
:= First_Index
(Desig_Typ
);
1187 while Present
(Id
) loop
1188 Index_Typ
:= Underlying_Type
(Etype
(Id
));
1190 if Denotes_Discriminant
(Type_Low_Bound
(Index_Typ
))
1192 Denotes_Discriminant
(Type_High_Bound
(Index_Typ
))
1194 Remove_Side_Effects
(P
);
1196 Build_Component_Subtype
1197 (Build_Actual_Array_Constraint
, Loc
, Base_Type
(T
));
1203 elsif Is_Composite_Type
(Desig_Typ
)
1204 and then Has_Discriminants
(Desig_Typ
)
1205 and then not Has_Unknown_Discriminants
(Desig_Typ
)
1207 if Is_Private_Type
(Desig_Typ
)
1208 and then No
(Discriminant_Constraint
(Desig_Typ
))
1210 Desig_Typ
:= Full_View
(Desig_Typ
);
1213 D
:= First_Elmt
(Discriminant_Constraint
(Desig_Typ
));
1214 while Present
(D
) loop
1215 if Denotes_Discriminant
(Node
(D
)) then
1216 Remove_Side_Effects
(P
);
1218 Build_Component_Subtype
(
1219 Build_Actual_Record_Constraint
, Loc
, Base_Type
(T
));
1226 -- If none of the above, the actual and nominal subtypes are the same
1229 end Build_Actual_Subtype_Of_Component
;
1231 -----------------------------
1232 -- Build_Component_Subtype --
1233 -----------------------------
1235 function Build_Component_Subtype
1238 T
: Entity_Id
) return Node_Id
1244 -- Unchecked_Union components do not require component subtypes
1246 if Is_Unchecked_Union
(T
) then
1250 Subt
:= Make_Temporary
(Loc
, 'S');
1251 Set_Is_Internal
(Subt
);
1254 Make_Subtype_Declaration
(Loc
,
1255 Defining_Identifier
=> Subt
,
1256 Subtype_Indication
=>
1257 Make_Subtype_Indication
(Loc
,
1258 Subtype_Mark
=> New_Occurrence_Of
(Base_Type
(T
), Loc
),
1260 Make_Index_Or_Discriminant_Constraint
(Loc
,
1261 Constraints
=> C
)));
1263 Mark_Rewrite_Insertion
(Decl
);
1265 end Build_Component_Subtype
;
1267 ----------------------------------
1268 -- Build_Default_Init_Cond_Call --
1269 ----------------------------------
1271 function Build_Default_Init_Cond_Call
1274 Typ
: Entity_Id
) return Node_Id
1276 Proc_Id
: constant Entity_Id
:= Default_Init_Cond_Procedure
(Typ
);
1277 Formal_Typ
: constant Entity_Id
:= Etype
(First_Formal
(Proc_Id
));
1281 Make_Procedure_Call_Statement
(Loc
,
1282 Name
=> New_Occurrence_Of
(Proc_Id
, Loc
),
1283 Parameter_Associations
=> New_List
(
1284 Make_Unchecked_Type_Conversion
(Loc
,
1285 Subtype_Mark
=> New_Occurrence_Of
(Formal_Typ
, Loc
),
1286 Expression
=> New_Occurrence_Of
(Obj_Id
, Loc
))));
1287 end Build_Default_Init_Cond_Call
;
1289 ----------------------------------------------
1290 -- Build_Default_Init_Cond_Procedure_Bodies --
1291 ----------------------------------------------
1293 procedure Build_Default_Init_Cond_Procedure_Bodies
(Priv_Decls
: List_Id
) is
1294 procedure Build_Default_Init_Cond_Procedure_Body
(Typ
: Entity_Id
);
1295 -- If type Typ is subject to pragma Default_Initial_Condition, build the
1296 -- body of the procedure which verifies the assumption of the pragma at
1297 -- run time. The generated body is added after the type declaration.
1299 --------------------------------------------
1300 -- Build_Default_Init_Cond_Procedure_Body --
1301 --------------------------------------------
1303 procedure Build_Default_Init_Cond_Procedure_Body
(Typ
: Entity_Id
) is
1304 Param_Id
: Entity_Id
;
1305 -- The entity of the sole formal parameter of the default initial
1306 -- condition procedure.
1308 procedure Replace_Type_Reference
(N
: Node_Id
);
1309 -- Replace a single reference to type Typ with a reference to formal
1310 -- parameter Param_Id.
1312 ----------------------------
1313 -- Replace_Type_Reference --
1314 ----------------------------
1316 procedure Replace_Type_Reference
(N
: Node_Id
) is
1318 Rewrite
(N
, New_Occurrence_Of
(Param_Id
, Sloc
(N
)));
1319 end Replace_Type_Reference
;
1321 procedure Replace_Type_References
is
1322 new Replace_Type_References_Generic
(Replace_Type_Reference
);
1326 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
1327 Prag
: constant Node_Id
:=
1328 Get_Pragma
(Typ
, Pragma_Default_Initial_Condition
);
1329 Proc_Id
: constant Entity_Id
:= Default_Init_Cond_Procedure
(Typ
);
1330 Spec_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Proc_Id
);
1331 Body_Decl
: Node_Id
;
1335 -- Start of processing for Build_Default_Init_Cond_Procedure_Body
1338 -- The procedure should be generated only for [sub]types subject to
1339 -- pragma Default_Initial_Condition. Types that inherit the pragma do
1340 -- not get this specialized procedure.
1342 pragma Assert
(Has_Default_Init_Cond
(Typ
));
1343 pragma Assert
(Present
(Prag
));
1344 pragma Assert
(Present
(Proc_Id
));
1346 -- Nothing to do if the body was already built
1348 if Present
(Corresponding_Body
(Spec_Decl
)) then
1352 Param_Id
:= First_Formal
(Proc_Id
);
1354 -- The pragma has an argument. Note that the argument is analyzed
1355 -- after all references to the current instance of the type are
1358 if Present
(Pragma_Argument_Associations
(Prag
)) then
1360 Get_Pragma_Arg
(First
(Pragma_Argument_Associations
(Prag
)));
1362 if Nkind
(Expr
) = N_Null
then
1363 Stmt
:= Make_Null_Statement
(Loc
);
1365 -- Preserve the original argument of the pragma by replicating it.
1366 -- Replace all references to the current instance of the type with
1367 -- references to the formal parameter.
1370 Expr
:= New_Copy_Tree
(Expr
);
1371 Replace_Type_References
(Expr
, Typ
);
1374 -- pragma Check (Default_Initial_Condition, <Expr>);
1378 Pragma_Identifier
=>
1379 Make_Identifier
(Loc
, Name_Check
),
1381 Pragma_Argument_Associations
=> New_List
(
1382 Make_Pragma_Argument_Association
(Loc
,
1384 Make_Identifier
(Loc
,
1385 Chars
=> Name_Default_Initial_Condition
)),
1386 Make_Pragma_Argument_Association
(Loc
,
1387 Expression
=> Expr
)));
1390 -- Otherwise the pragma appears without an argument
1393 Stmt
:= Make_Null_Statement
(Loc
);
1397 -- procedure <Typ>Default_Init_Cond (I : <Typ>) is
1400 -- end <Typ>Default_Init_Cond;
1403 Make_Subprogram_Body
(Loc
,
1405 Copy_Separate_Tree
(Specification
(Spec_Decl
)),
1406 Declarations
=> Empty_List
,
1407 Handled_Statement_Sequence
=>
1408 Make_Handled_Sequence_Of_Statements
(Loc
,
1409 Statements
=> New_List
(Stmt
)));
1411 -- Link the spec and body of the default initial condition procedure
1412 -- to prevent the generation of a duplicate body.
1414 Set_Corresponding_Body
(Spec_Decl
, Defining_Entity
(Body_Decl
));
1415 Set_Corresponding_Spec
(Body_Decl
, Proc_Id
);
1417 Insert_After_And_Analyze
(Declaration_Node
(Typ
), Body_Decl
);
1418 end Build_Default_Init_Cond_Procedure_Body
;
1425 -- Start of processing for Build_Default_Init_Cond_Procedure_Bodies
1428 -- Inspect the private declarations looking for [sub]type declarations
1430 Decl
:= First
(Priv_Decls
);
1431 while Present
(Decl
) loop
1432 if Nkind_In
(Decl
, N_Full_Type_Declaration
,
1433 N_Subtype_Declaration
)
1435 Typ
:= Defining_Entity
(Decl
);
1437 -- Guard against partially decorate types due to previous errors
1439 if Is_Type
(Typ
) then
1441 -- If the type is subject to pragma Default_Initial_Condition,
1442 -- generate the body of the internal procedure which verifies
1443 -- the assertion of the pragma at run time.
1445 if Has_Default_Init_Cond
(Typ
) then
1446 Build_Default_Init_Cond_Procedure_Body
(Typ
);
1448 -- A derived type inherits the default initial condition
1449 -- procedure from its parent type.
1451 elsif Has_Inherited_Default_Init_Cond
(Typ
) then
1452 Inherit_Default_Init_Cond_Procedure
(Typ
);
1459 end Build_Default_Init_Cond_Procedure_Bodies
;
1461 ---------------------------------------------------
1462 -- Build_Default_Init_Cond_Procedure_Declaration --
1463 ---------------------------------------------------
1465 procedure Build_Default_Init_Cond_Procedure_Declaration
(Typ
: Entity_Id
) is
1466 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
1467 Prag
: constant Node_Id
:=
1468 Get_Pragma
(Typ
, Pragma_Default_Initial_Condition
);
1469 Proc_Id
: Entity_Id
;
1472 -- The procedure should be generated only for types subject to pragma
1473 -- Default_Initial_Condition. Types that inherit the pragma do not get
1474 -- this specialized procedure.
1476 pragma Assert
(Has_Default_Init_Cond
(Typ
));
1477 pragma Assert
(Present
(Prag
));
1479 -- Nothing to do if default initial condition procedure already built
1481 if Present
(Default_Init_Cond_Procedure
(Typ
)) then
1486 Make_Defining_Identifier
(Loc
,
1487 Chars
=> New_External_Name
(Chars
(Typ
), "Default_Init_Cond"));
1489 -- Associate default initial condition procedure with the private type
1491 Set_Ekind
(Proc_Id
, E_Procedure
);
1492 Set_Is_Default_Init_Cond_Procedure
(Proc_Id
);
1493 Set_Default_Init_Cond_Procedure
(Typ
, Proc_Id
);
1496 -- procedure <Typ>Default_Init_Cond (Inn : <Typ>);
1498 Insert_After_And_Analyze
(Prag
,
1499 Make_Subprogram_Declaration
(Loc
,
1501 Make_Procedure_Specification
(Loc
,
1502 Defining_Unit_Name
=> Proc_Id
,
1503 Parameter_Specifications
=> New_List
(
1504 Make_Parameter_Specification
(Loc
,
1505 Defining_Identifier
=> Make_Temporary
(Loc
, 'I'),
1506 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
))))));
1507 end Build_Default_Init_Cond_Procedure_Declaration
;
1509 ---------------------------
1510 -- Build_Default_Subtype --
1511 ---------------------------
1513 function Build_Default_Subtype
1515 N
: Node_Id
) return Entity_Id
1517 Loc
: constant Source_Ptr
:= Sloc
(N
);
1521 -- The base type that is to be constrained by the defaults
1524 if not Has_Discriminants
(T
) or else Is_Constrained
(T
) then
1528 Bas
:= Base_Type
(T
);
1530 -- If T is non-private but its base type is private, this is the
1531 -- completion of a subtype declaration whose parent type is private
1532 -- (see Complete_Private_Subtype in Sem_Ch3). The proper discriminants
1533 -- are to be found in the full view of the base. Check that the private
1534 -- status of T and its base differ.
1536 if Is_Private_Type
(Bas
)
1537 and then not Is_Private_Type
(T
)
1538 and then Present
(Full_View
(Bas
))
1540 Bas
:= Full_View
(Bas
);
1543 Disc
:= First_Discriminant
(T
);
1545 if No
(Discriminant_Default_Value
(Disc
)) then
1550 Act
: constant Entity_Id
:= Make_Temporary
(Loc
, 'S');
1551 Constraints
: constant List_Id
:= New_List
;
1555 while Present
(Disc
) loop
1556 Append_To
(Constraints
,
1557 New_Copy_Tree
(Discriminant_Default_Value
(Disc
)));
1558 Next_Discriminant
(Disc
);
1562 Make_Subtype_Declaration
(Loc
,
1563 Defining_Identifier
=> Act
,
1564 Subtype_Indication
=>
1565 Make_Subtype_Indication
(Loc
,
1566 Subtype_Mark
=> New_Occurrence_Of
(Bas
, Loc
),
1568 Make_Index_Or_Discriminant_Constraint
(Loc
,
1569 Constraints
=> Constraints
)));
1571 Insert_Action
(N
, Decl
);
1575 end Build_Default_Subtype
;
1577 --------------------------------------------
1578 -- Build_Discriminal_Subtype_Of_Component --
1579 --------------------------------------------
1581 function Build_Discriminal_Subtype_Of_Component
1582 (T
: Entity_Id
) return Node_Id
1584 Loc
: constant Source_Ptr
:= Sloc
(T
);
1588 function Build_Discriminal_Array_Constraint
return List_Id
;
1589 -- If one or more of the bounds of the component depends on
1590 -- discriminants, build actual constraint using the discriminants
1593 function Build_Discriminal_Record_Constraint
return List_Id
;
1594 -- Similar to previous one, for discriminated components constrained by
1595 -- the discriminant of the enclosing object.
1597 ----------------------------------------
1598 -- Build_Discriminal_Array_Constraint --
1599 ----------------------------------------
1601 function Build_Discriminal_Array_Constraint
return List_Id
is
1602 Constraints
: constant List_Id
:= New_List
;
1610 Indx
:= First_Index
(T
);
1611 while Present
(Indx
) loop
1612 Old_Lo
:= Type_Low_Bound
(Etype
(Indx
));
1613 Old_Hi
:= Type_High_Bound
(Etype
(Indx
));
1615 if Denotes_Discriminant
(Old_Lo
) then
1616 Lo
:= New_Occurrence_Of
(Discriminal
(Entity
(Old_Lo
)), Loc
);
1619 Lo
:= New_Copy_Tree
(Old_Lo
);
1622 if Denotes_Discriminant
(Old_Hi
) then
1623 Hi
:= New_Occurrence_Of
(Discriminal
(Entity
(Old_Hi
)), Loc
);
1626 Hi
:= New_Copy_Tree
(Old_Hi
);
1629 Append
(Make_Range
(Loc
, Lo
, Hi
), Constraints
);
1634 end Build_Discriminal_Array_Constraint
;
1636 -----------------------------------------
1637 -- Build_Discriminal_Record_Constraint --
1638 -----------------------------------------
1640 function Build_Discriminal_Record_Constraint
return List_Id
is
1641 Constraints
: constant List_Id
:= New_List
;
1646 D
:= First_Elmt
(Discriminant_Constraint
(T
));
1647 while Present
(D
) loop
1648 if Denotes_Discriminant
(Node
(D
)) then
1650 New_Occurrence_Of
(Discriminal
(Entity
(Node
(D
))), Loc
);
1652 D_Val
:= New_Copy_Tree
(Node
(D
));
1655 Append
(D_Val
, Constraints
);
1660 end Build_Discriminal_Record_Constraint
;
1662 -- Start of processing for Build_Discriminal_Subtype_Of_Component
1665 if Ekind
(T
) = E_Array_Subtype
then
1666 Id
:= First_Index
(T
);
1667 while Present
(Id
) loop
1668 if Denotes_Discriminant
(Type_Low_Bound
(Etype
(Id
)))
1670 Denotes_Discriminant
(Type_High_Bound
(Etype
(Id
)))
1672 return Build_Component_Subtype
1673 (Build_Discriminal_Array_Constraint
, Loc
, T
);
1679 elsif Ekind
(T
) = E_Record_Subtype
1680 and then Has_Discriminants
(T
)
1681 and then not Has_Unknown_Discriminants
(T
)
1683 D
:= First_Elmt
(Discriminant_Constraint
(T
));
1684 while Present
(D
) loop
1685 if Denotes_Discriminant
(Node
(D
)) then
1686 return Build_Component_Subtype
1687 (Build_Discriminal_Record_Constraint
, Loc
, T
);
1694 -- If none of the above, the actual and nominal subtypes are the same
1697 end Build_Discriminal_Subtype_Of_Component
;
1699 ------------------------------
1700 -- Build_Elaboration_Entity --
1701 ------------------------------
1703 procedure Build_Elaboration_Entity
(N
: Node_Id
; Spec_Id
: Entity_Id
) is
1704 Loc
: constant Source_Ptr
:= Sloc
(N
);
1706 Elab_Ent
: Entity_Id
;
1708 procedure Set_Package_Name
(Ent
: Entity_Id
);
1709 -- Given an entity, sets the fully qualified name of the entity in
1710 -- Name_Buffer, with components separated by double underscores. This
1711 -- is a recursive routine that climbs the scope chain to Standard.
1713 ----------------------
1714 -- Set_Package_Name --
1715 ----------------------
1717 procedure Set_Package_Name
(Ent
: Entity_Id
) is
1719 if Scope
(Ent
) /= Standard_Standard
then
1720 Set_Package_Name
(Scope
(Ent
));
1723 Nam
: constant String := Get_Name_String
(Chars
(Ent
));
1725 Name_Buffer
(Name_Len
+ 1) := '_';
1726 Name_Buffer
(Name_Len
+ 2) := '_';
1727 Name_Buffer
(Name_Len
+ 3 .. Name_Len
+ Nam
'Length + 2) := Nam
;
1728 Name_Len
:= Name_Len
+ Nam
'Length + 2;
1732 Get_Name_String
(Chars
(Ent
));
1734 end Set_Package_Name
;
1736 -- Start of processing for Build_Elaboration_Entity
1739 -- Ignore call if already constructed
1741 if Present
(Elaboration_Entity
(Spec_Id
)) then
1744 -- Ignore in ASIS mode, elaboration entity is not in source and plays
1745 -- no role in analysis.
1747 elsif ASIS_Mode
then
1750 -- See if we need elaboration entity. We always need it for the dynamic
1751 -- elaboration model, since it is needed to properly generate the PE
1752 -- exception for access before elaboration.
1754 elsif Dynamic_Elaboration_Checks
then
1757 -- For the static model, we don't need the elaboration counter if this
1758 -- unit is sure to have no elaboration code, since that means there
1759 -- is no elaboration unit to be called. Note that we can't just decide
1760 -- after the fact by looking to see whether there was elaboration code,
1761 -- because that's too late to make this decision.
1763 elsif Restriction_Active
(No_Elaboration_Code
) then
1766 -- Similarly, for the static model, we can skip the elaboration counter
1767 -- if we have the No_Multiple_Elaboration restriction, since for the
1768 -- static model, that's the only purpose of the counter (to avoid
1769 -- multiple elaboration).
1771 elsif Restriction_Active
(No_Multiple_Elaboration
) then
1775 -- Here we need the elaboration entity
1777 -- Construct name of elaboration entity as xxx_E, where xxx is the unit
1778 -- name with dots replaced by double underscore. We have to manually
1779 -- construct this name, since it will be elaborated in the outer scope,
1780 -- and thus will not have the unit name automatically prepended.
1782 Set_Package_Name
(Spec_Id
);
1783 Add_Str_To_Name_Buffer
("_E");
1785 -- Create elaboration counter
1787 Elab_Ent
:= Make_Defining_Identifier
(Loc
, Chars
=> Name_Find
);
1788 Set_Elaboration_Entity
(Spec_Id
, Elab_Ent
);
1791 Make_Object_Declaration
(Loc
,
1792 Defining_Identifier
=> Elab_Ent
,
1793 Object_Definition
=>
1794 New_Occurrence_Of
(Standard_Short_Integer
, Loc
),
1795 Expression
=> Make_Integer_Literal
(Loc
, Uint_0
));
1797 Push_Scope
(Standard_Standard
);
1798 Add_Global_Declaration
(Decl
);
1801 -- Reset True_Constant indication, since we will indeed assign a value
1802 -- to the variable in the binder main. We also kill the Current_Value
1803 -- and Last_Assignment fields for the same reason.
1805 Set_Is_True_Constant
(Elab_Ent
, False);
1806 Set_Current_Value
(Elab_Ent
, Empty
);
1807 Set_Last_Assignment
(Elab_Ent
, Empty
);
1809 -- We do not want any further qualification of the name (if we did not
1810 -- do this, we would pick up the name of the generic package in the case
1811 -- of a library level generic instantiation).
1813 Set_Has_Qualified_Name
(Elab_Ent
);
1814 Set_Has_Fully_Qualified_Name
(Elab_Ent
);
1815 end Build_Elaboration_Entity
;
1817 --------------------------------
1818 -- Build_Explicit_Dereference --
1819 --------------------------------
1821 procedure Build_Explicit_Dereference
1825 Loc
: constant Source_Ptr
:= Sloc
(Expr
);
1828 -- An entity of a type with a reference aspect is overloaded with
1829 -- both interpretations: with and without the dereference. Now that
1830 -- the dereference is made explicit, set the type of the node properly,
1831 -- to prevent anomalies in the backend. Same if the expression is an
1832 -- overloaded function call whose return type has a reference aspect.
1834 if Is_Entity_Name
(Expr
) then
1835 Set_Etype
(Expr
, Etype
(Entity
(Expr
)));
1837 elsif Nkind
(Expr
) = N_Function_Call
then
1838 Set_Etype
(Expr
, Etype
(Name
(Expr
)));
1841 Set_Is_Overloaded
(Expr
, False);
1843 -- The expression will often be a generalized indexing that yields a
1844 -- container element that is then dereferenced, in which case the
1845 -- generalized indexing call is also non-overloaded.
1847 if Nkind
(Expr
) = N_Indexed_Component
1848 and then Present
(Generalized_Indexing
(Expr
))
1850 Set_Is_Overloaded
(Generalized_Indexing
(Expr
), False);
1854 Make_Explicit_Dereference
(Loc
,
1856 Make_Selected_Component
(Loc
,
1857 Prefix
=> Relocate_Node
(Expr
),
1858 Selector_Name
=> New_Occurrence_Of
(Disc
, Loc
))));
1859 Set_Etype
(Prefix
(Expr
), Etype
(Disc
));
1860 Set_Etype
(Expr
, Designated_Type
(Etype
(Disc
)));
1861 end Build_Explicit_Dereference
;
1863 -----------------------------------
1864 -- Cannot_Raise_Constraint_Error --
1865 -----------------------------------
1867 function Cannot_Raise_Constraint_Error
(Expr
: Node_Id
) return Boolean is
1869 if Compile_Time_Known_Value
(Expr
) then
1872 elsif Do_Range_Check
(Expr
) then
1875 elsif Raises_Constraint_Error
(Expr
) then
1879 case Nkind
(Expr
) is
1880 when N_Identifier
=>
1883 when N_Expanded_Name
=>
1886 when N_Selected_Component
=>
1887 return not Do_Discriminant_Check
(Expr
);
1889 when N_Attribute_Reference
=>
1890 if Do_Overflow_Check
(Expr
) then
1893 elsif No
(Expressions
(Expr
)) then
1901 N
:= First
(Expressions
(Expr
));
1902 while Present
(N
) loop
1903 if Cannot_Raise_Constraint_Error
(N
) then
1914 when N_Type_Conversion
=>
1915 if Do_Overflow_Check
(Expr
)
1916 or else Do_Length_Check
(Expr
)
1917 or else Do_Tag_Check
(Expr
)
1921 return Cannot_Raise_Constraint_Error
(Expression
(Expr
));
1924 when N_Unchecked_Type_Conversion
=>
1925 return Cannot_Raise_Constraint_Error
(Expression
(Expr
));
1928 if Do_Overflow_Check
(Expr
) then
1931 return Cannot_Raise_Constraint_Error
(Right_Opnd
(Expr
));
1938 if Do_Division_Check
(Expr
)
1940 Do_Overflow_Check
(Expr
)
1945 Cannot_Raise_Constraint_Error
(Left_Opnd
(Expr
))
1947 Cannot_Raise_Constraint_Error
(Right_Opnd
(Expr
));
1966 N_Op_Shift_Right_Arithmetic |
1970 if Do_Overflow_Check
(Expr
) then
1974 Cannot_Raise_Constraint_Error
(Left_Opnd
(Expr
))
1976 Cannot_Raise_Constraint_Error
(Right_Opnd
(Expr
));
1983 end Cannot_Raise_Constraint_Error
;
1985 -----------------------------------------
1986 -- Check_Dynamically_Tagged_Expression --
1987 -----------------------------------------
1989 procedure Check_Dynamically_Tagged_Expression
1992 Related_Nod
: Node_Id
)
1995 pragma Assert
(Is_Tagged_Type
(Typ
));
1997 -- In order to avoid spurious errors when analyzing the expanded code,
1998 -- this check is done only for nodes that come from source and for
1999 -- actuals of generic instantiations.
2001 if (Comes_From_Source
(Related_Nod
)
2002 or else In_Generic_Actual
(Expr
))
2003 and then (Is_Class_Wide_Type
(Etype
(Expr
))
2004 or else Is_Dynamically_Tagged
(Expr
))
2005 and then Is_Tagged_Type
(Typ
)
2006 and then not Is_Class_Wide_Type
(Typ
)
2008 Error_Msg_N
("dynamically tagged expression not allowed!", Expr
);
2010 end Check_Dynamically_Tagged_Expression
;
2012 --------------------------
2013 -- Check_Fully_Declared --
2014 --------------------------
2016 procedure Check_Fully_Declared
(T
: Entity_Id
; N
: Node_Id
) is
2018 if Ekind
(T
) = E_Incomplete_Type
then
2020 -- Ada 2005 (AI-50217): If the type is available through a limited
2021 -- with_clause, verify that its full view has been analyzed.
2023 if From_Limited_With
(T
)
2024 and then Present
(Non_Limited_View
(T
))
2025 and then Ekind
(Non_Limited_View
(T
)) /= E_Incomplete_Type
2027 -- The non-limited view is fully declared
2033 ("premature usage of incomplete}", N
, First_Subtype
(T
));
2036 -- Need comments for these tests ???
2038 elsif Has_Private_Component
(T
)
2039 and then not Is_Generic_Type
(Root_Type
(T
))
2040 and then not In_Spec_Expression
2042 -- Special case: if T is the anonymous type created for a single
2043 -- task or protected object, use the name of the source object.
2045 if Is_Concurrent_Type
(T
)
2046 and then not Comes_From_Source
(T
)
2047 and then Nkind
(N
) = N_Object_Declaration
2050 ("type of& has incomplete component",
2051 N
, Defining_Identifier
(N
));
2054 ("premature usage of incomplete}",
2055 N
, First_Subtype
(T
));
2058 end Check_Fully_Declared
;
2060 -------------------------------------
2061 -- Check_Function_Writable_Actuals --
2062 -------------------------------------
2064 procedure Check_Function_Writable_Actuals
(N
: Node_Id
) is
2065 Writable_Actuals_List
: Elist_Id
:= No_Elist
;
2066 Identifiers_List
: Elist_Id
:= No_Elist
;
2067 Error_Node
: Node_Id
:= Empty
;
2069 procedure Collect_Identifiers
(N
: Node_Id
);
2070 -- In a single traversal of subtree N collect in Writable_Actuals_List
2071 -- all the actuals of functions with writable actuals, and in the list
2072 -- Identifiers_List collect all the identifiers that are not actuals of
2073 -- functions with writable actuals. If a writable actual is referenced
2074 -- twice as writable actual then Error_Node is set to reference its
2075 -- second occurrence, the error is reported, and the tree traversal
2078 function Get_Function_Id
(Call
: Node_Id
) return Entity_Id
;
2079 -- Return the entity associated with the function call
2081 procedure Preanalyze_Without_Errors
(N
: Node_Id
);
2082 -- Preanalyze N without reporting errors. Very dubious, you can't just
2083 -- go analyzing things more than once???
2085 -------------------------
2086 -- Collect_Identifiers --
2087 -------------------------
2089 procedure Collect_Identifiers
(N
: Node_Id
) is
2091 function Check_Node
(N
: Node_Id
) return Traverse_Result
;
2092 -- Process a single node during the tree traversal to collect the
2093 -- writable actuals of functions and all the identifiers which are
2094 -- not writable actuals of functions.
2096 function Contains
(List
: Elist_Id
; N
: Node_Id
) return Boolean;
2097 -- Returns True if List has a node whose Entity is Entity (N)
2099 -------------------------
2100 -- Check_Function_Call --
2101 -------------------------
2103 function Check_Node
(N
: Node_Id
) return Traverse_Result
is
2104 Is_Writable_Actual
: Boolean := False;
2108 if Nkind
(N
) = N_Identifier
then
2110 -- No analysis possible if the entity is not decorated
2112 if No
(Entity
(N
)) then
2115 -- Don't collect identifiers of packages, called functions, etc
2117 elsif Ekind_In
(Entity
(N
), E_Package
,
2124 -- Analyze if N is a writable actual of a function
2126 elsif Nkind
(Parent
(N
)) = N_Function_Call
then
2128 Call
: constant Node_Id
:= Parent
(N
);
2133 Id
:= Get_Function_Id
(Call
);
2135 Formal
:= First_Formal
(Id
);
2136 Actual
:= First_Actual
(Call
);
2137 while Present
(Actual
) and then Present
(Formal
) loop
2139 if Ekind_In
(Formal
, E_Out_Parameter
,
2142 Is_Writable_Actual
:= True;
2148 Next_Formal
(Formal
);
2149 Next_Actual
(Actual
);
2154 if Is_Writable_Actual
then
2155 if Contains
(Writable_Actuals_List
, N
) then
2157 ("value may be affected by call to& "
2158 & "because order of evaluation is arbitrary", N
, Id
);
2163 Append_New_Elmt
(N
, To
=> Writable_Actuals_List
);
2166 if Identifiers_List
= No_Elist
then
2167 Identifiers_List
:= New_Elmt_List
;
2170 Append_Unique_Elmt
(N
, Identifiers_List
);
2183 N
: Node_Id
) return Boolean
2185 pragma Assert
(Nkind
(N
) in N_Has_Entity
);
2190 if List
= No_Elist
then
2194 Elmt
:= First_Elmt
(List
);
2195 while Present
(Elmt
) loop
2196 if Entity
(Node
(Elmt
)) = Entity
(N
) then
2210 procedure Do_Traversal
is new Traverse_Proc
(Check_Node
);
2211 -- The traversal procedure
2213 -- Start of processing for Collect_Identifiers
2216 if Present
(Error_Node
) then
2220 if Nkind
(N
) in N_Subexpr
and then Is_OK_Static_Expression
(N
) then
2225 end Collect_Identifiers
;
2227 ---------------------
2228 -- Get_Function_Id --
2229 ---------------------
2231 function Get_Function_Id
(Call
: Node_Id
) return Entity_Id
is
2232 Nam
: constant Node_Id
:= Name
(Call
);
2236 if Nkind
(Nam
) = N_Explicit_Dereference
then
2238 pragma Assert
(Ekind
(Id
) = E_Subprogram_Type
);
2240 elsif Nkind
(Nam
) = N_Selected_Component
then
2241 Id
:= Entity
(Selector_Name
(Nam
));
2243 elsif Nkind
(Nam
) = N_Indexed_Component
then
2244 Id
:= Entity
(Selector_Name
(Prefix
(Nam
)));
2251 end Get_Function_Id
;
2253 ---------------------------
2254 -- Preanalyze_Expression --
2255 ---------------------------
2257 procedure Preanalyze_Without_Errors
(N
: Node_Id
) is
2258 Status
: constant Boolean := Get_Ignore_Errors
;
2260 Set_Ignore_Errors
(True);
2262 Set_Ignore_Errors
(Status
);
2263 end Preanalyze_Without_Errors
;
2265 -- Start of processing for Check_Function_Writable_Actuals
2268 -- The check only applies to Ada 2012 code, and only to constructs that
2269 -- have multiple constituents whose order of evaluation is not specified
2272 if Ada_Version
< Ada_2012
2273 or else (not (Nkind
(N
) in N_Op
)
2274 and then not (Nkind
(N
) in N_Membership_Test
)
2275 and then not Nkind_In
(N
, N_Range
,
2277 N_Extension_Aggregate
,
2278 N_Full_Type_Declaration
,
2280 N_Procedure_Call_Statement
,
2281 N_Entry_Call_Statement
))
2282 or else (Nkind
(N
) = N_Full_Type_Declaration
2283 and then not Is_Record_Type
(Defining_Identifier
(N
)))
2285 -- In addition, this check only applies to source code, not to code
2286 -- generated by constraint checks.
2288 or else not Comes_From_Source
(N
)
2293 -- If a construct C has two or more direct constituents that are names
2294 -- or expressions whose evaluation may occur in an arbitrary order, at
2295 -- least one of which contains a function call with an in out or out
2296 -- parameter, then the construct is legal only if: for each name N that
2297 -- is passed as a parameter of mode in out or out to some inner function
2298 -- call C2 (not including the construct C itself), there is no other
2299 -- name anywhere within a direct constituent of the construct C other
2300 -- than the one containing C2, that is known to refer to the same
2301 -- object (RM 6.4.1(6.17/3)).
2305 Collect_Identifiers
(Low_Bound
(N
));
2306 Collect_Identifiers
(High_Bound
(N
));
2308 when N_Op | N_Membership_Test
=>
2313 Collect_Identifiers
(Left_Opnd
(N
));
2315 if Present
(Right_Opnd
(N
)) then
2316 Collect_Identifiers
(Right_Opnd
(N
));
2319 if Nkind_In
(N
, N_In
, N_Not_In
)
2320 and then Present
(Alternatives
(N
))
2322 Expr
:= First
(Alternatives
(N
));
2323 while Present
(Expr
) loop
2324 Collect_Identifiers
(Expr
);
2331 when N_Full_Type_Declaration
=>
2333 function Get_Record_Part
(N
: Node_Id
) return Node_Id
;
2334 -- Return the record part of this record type definition
2336 function Get_Record_Part
(N
: Node_Id
) return Node_Id
is
2337 Type_Def
: constant Node_Id
:= Type_Definition
(N
);
2339 if Nkind
(Type_Def
) = N_Derived_Type_Definition
then
2340 return Record_Extension_Part
(Type_Def
);
2344 end Get_Record_Part
;
2347 Def_Id
: Entity_Id
:= Defining_Identifier
(N
);
2348 Rec
: Node_Id
:= Get_Record_Part
(N
);
2351 -- No need to perform any analysis if the record has no
2354 if No
(Rec
) or else No
(Component_List
(Rec
)) then
2358 -- Collect the identifiers starting from the deepest
2359 -- derivation. Done to report the error in the deepest
2363 if Present
(Component_List
(Rec
)) then
2364 Comp
:= First
(Component_Items
(Component_List
(Rec
)));
2365 while Present
(Comp
) loop
2366 if Nkind
(Comp
) = N_Component_Declaration
2367 and then Present
(Expression
(Comp
))
2369 Collect_Identifiers
(Expression
(Comp
));
2376 exit when No
(Underlying_Type
(Etype
(Def_Id
)))
2377 or else Base_Type
(Underlying_Type
(Etype
(Def_Id
)))
2380 Def_Id
:= Base_Type
(Underlying_Type
(Etype
(Def_Id
)));
2381 Rec
:= Get_Record_Part
(Parent
(Def_Id
));
2385 when N_Subprogram_Call |
2386 N_Entry_Call_Statement
=>
2388 Id
: constant Entity_Id
:= Get_Function_Id
(N
);
2393 Formal
:= First_Formal
(Id
);
2394 Actual
:= First_Actual
(N
);
2395 while Present
(Actual
) and then Present
(Formal
) loop
2396 if Ekind_In
(Formal
, E_Out_Parameter
,
2399 Collect_Identifiers
(Actual
);
2402 Next_Formal
(Formal
);
2403 Next_Actual
(Actual
);
2408 N_Extension_Aggregate
=>
2412 Comp_Expr
: Node_Id
;
2415 -- Handle the N_Others_Choice of array aggregates with static
2416 -- bounds. There is no need to perform this analysis in
2417 -- aggregates without static bounds since we cannot evaluate
2418 -- if the N_Others_Choice covers several elements. There is
2419 -- no need to handle the N_Others choice of record aggregates
2420 -- since at this stage it has been already expanded by
2421 -- Resolve_Record_Aggregate.
2423 if Is_Array_Type
(Etype
(N
))
2424 and then Nkind
(N
) = N_Aggregate
2425 and then Present
(Aggregate_Bounds
(N
))
2426 and then Compile_Time_Known_Bounds
(Etype
(N
))
2427 and then Expr_Value
(High_Bound
(Aggregate_Bounds
(N
)))
2429 Expr_Value
(Low_Bound
(Aggregate_Bounds
(N
)))
2432 Count_Components
: Uint
:= Uint_0
;
2433 Num_Components
: Uint
;
2434 Others_Assoc
: Node_Id
;
2435 Others_Choice
: Node_Id
:= Empty
;
2436 Others_Box_Present
: Boolean := False;
2439 -- Count positional associations
2441 if Present
(Expressions
(N
)) then
2442 Comp_Expr
:= First
(Expressions
(N
));
2443 while Present
(Comp_Expr
) loop
2444 Count_Components
:= Count_Components
+ 1;
2449 -- Count the rest of elements and locate the N_Others
2452 Assoc
:= First
(Component_Associations
(N
));
2453 while Present
(Assoc
) loop
2454 Choice
:= First
(Choices
(Assoc
));
2455 while Present
(Choice
) loop
2456 if Nkind
(Choice
) = N_Others_Choice
then
2457 Others_Assoc
:= Assoc
;
2458 Others_Choice
:= Choice
;
2459 Others_Box_Present
:= Box_Present
(Assoc
);
2461 -- Count several components
2463 elsif Nkind_In
(Choice
, N_Range
,
2464 N_Subtype_Indication
)
2465 or else (Is_Entity_Name
(Choice
)
2466 and then Is_Type
(Entity
(Choice
)))
2471 Get_Index_Bounds
(Choice
, L
, H
);
2473 (Compile_Time_Known_Value
(L
)
2474 and then Compile_Time_Known_Value
(H
));
2477 + Expr_Value
(H
) - Expr_Value
(L
) + 1;
2480 -- Count single component. No other case available
2481 -- since we are handling an aggregate with static
2485 pragma Assert
(Is_OK_Static_Expression
(Choice
)
2486 or else Nkind
(Choice
) = N_Identifier
2487 or else Nkind
(Choice
) = N_Integer_Literal
);
2489 Count_Components
:= Count_Components
+ 1;
2499 Expr_Value
(High_Bound
(Aggregate_Bounds
(N
))) -
2500 Expr_Value
(Low_Bound
(Aggregate_Bounds
(N
))) + 1;
2502 pragma Assert
(Count_Components
<= Num_Components
);
2504 -- Handle the N_Others choice if it covers several
2507 if Present
(Others_Choice
)
2508 and then (Num_Components
- Count_Components
) > 1
2510 if not Others_Box_Present
then
2512 -- At this stage, if expansion is active, the
2513 -- expression of the others choice has not been
2514 -- analyzed. Hence we generate a duplicate and
2515 -- we analyze it silently to have available the
2516 -- minimum decoration required to collect the
2519 if not Expander_Active
then
2520 Comp_Expr
:= Expression
(Others_Assoc
);
2523 New_Copy_Tree
(Expression
(Others_Assoc
));
2524 Preanalyze_Without_Errors
(Comp_Expr
);
2527 Collect_Identifiers
(Comp_Expr
);
2529 if Writable_Actuals_List
/= No_Elist
then
2531 -- As suggested by Robert, at current stage we
2532 -- report occurrences of this case as warnings.
2535 ("writable function parameter may affect "
2536 & "value in other component because order "
2537 & "of evaluation is unspecified??",
2538 Node
(First_Elmt
(Writable_Actuals_List
)));
2545 -- Handle ancestor part of extension aggregates
2547 if Nkind
(N
) = N_Extension_Aggregate
then
2548 Collect_Identifiers
(Ancestor_Part
(N
));
2551 -- Handle positional associations
2553 if Present
(Expressions
(N
)) then
2554 Comp_Expr
:= First
(Expressions
(N
));
2555 while Present
(Comp_Expr
) loop
2556 if not Is_OK_Static_Expression
(Comp_Expr
) then
2557 Collect_Identifiers
(Comp_Expr
);
2564 -- Handle discrete associations
2566 if Present
(Component_Associations
(N
)) then
2567 Assoc
:= First
(Component_Associations
(N
));
2568 while Present
(Assoc
) loop
2570 if not Box_Present
(Assoc
) then
2571 Choice
:= First
(Choices
(Assoc
));
2572 while Present
(Choice
) loop
2574 -- For now we skip discriminants since it requires
2575 -- performing the analysis in two phases: first one
2576 -- analyzing discriminants and second one analyzing
2577 -- the rest of components since discriminants are
2578 -- evaluated prior to components: too much extra
2579 -- work to detect a corner case???
2581 if Nkind
(Choice
) in N_Has_Entity
2582 and then Present
(Entity
(Choice
))
2583 and then Ekind
(Entity
(Choice
)) = E_Discriminant
2587 elsif Box_Present
(Assoc
) then
2591 if not Analyzed
(Expression
(Assoc
)) then
2593 New_Copy_Tree
(Expression
(Assoc
));
2594 Set_Parent
(Comp_Expr
, Parent
(N
));
2595 Preanalyze_Without_Errors
(Comp_Expr
);
2597 Comp_Expr
:= Expression
(Assoc
);
2600 Collect_Identifiers
(Comp_Expr
);
2616 -- No further action needed if we already reported an error
2618 if Present
(Error_Node
) then
2622 -- Check if some writable argument of a function is referenced
2624 if Writable_Actuals_List
/= No_Elist
2625 and then Identifiers_List
/= No_Elist
2632 Elmt_1
:= First_Elmt
(Writable_Actuals_List
);
2633 while Present
(Elmt_1
) loop
2634 Elmt_2
:= First_Elmt
(Identifiers_List
);
2635 while Present
(Elmt_2
) loop
2636 if Entity
(Node
(Elmt_1
)) = Entity
(Node
(Elmt_2
)) then
2637 case Nkind
(Parent
(Node
(Elmt_2
))) is
2639 N_Component_Association |
2640 N_Component_Declaration
=>
2642 ("value may be affected by call in other "
2643 & "component because they are evaluated "
2644 & "in unspecified order",
2647 when N_In | N_Not_In
=>
2649 ("value may be affected by call in other "
2650 & "alternative because they are evaluated "
2651 & "in unspecified order",
2656 ("value of actual may be affected by call in "
2657 & "other actual because they are evaluated "
2658 & "in unspecified order",
2670 end Check_Function_Writable_Actuals
;
2672 --------------------------------
2673 -- Check_Implicit_Dereference --
2674 --------------------------------
2676 procedure Check_Implicit_Dereference
(N
: Node_Id
; Typ
: Entity_Id
) is
2682 if Nkind
(N
) = N_Indexed_Component
2683 and then Present
(Generalized_Indexing
(N
))
2685 Nam
:= Generalized_Indexing
(N
);
2691 if Ada_Version
< Ada_2012
2692 or else not Has_Implicit_Dereference
(Base_Type
(Typ
))
2696 elsif not Comes_From_Source
(N
)
2697 and then Nkind
(N
) /= N_Indexed_Component
2701 elsif Is_Entity_Name
(Nam
) and then Is_Type
(Entity
(Nam
)) then
2705 Disc
:= First_Discriminant
(Typ
);
2706 while Present
(Disc
) loop
2707 if Has_Implicit_Dereference
(Disc
) then
2708 Desig
:= Designated_Type
(Etype
(Disc
));
2709 Add_One_Interp
(Nam
, Disc
, Desig
);
2711 -- If the node is a generalized indexing, add interpretation
2712 -- to that node as well, for subsequent resolution.
2714 if Nkind
(N
) = N_Indexed_Component
then
2715 Add_One_Interp
(N
, Disc
, Desig
);
2718 -- If the operation comes from a generic unit and the context
2719 -- is a selected component, the selector name may be global
2720 -- and set in the instance already. Remove the entity to
2721 -- force resolution of the selected component, and the
2722 -- generation of an explicit dereference if needed.
2725 and then Nkind
(Parent
(Nam
)) = N_Selected_Component
2727 Set_Entity
(Selector_Name
(Parent
(Nam
)), Empty
);
2733 Next_Discriminant
(Disc
);
2736 end Check_Implicit_Dereference
;
2738 ----------------------------------
2739 -- Check_Internal_Protected_Use --
2740 ----------------------------------
2742 procedure Check_Internal_Protected_Use
(N
: Node_Id
; Nam
: Entity_Id
) is
2748 while Present
(S
) loop
2749 if S
= Standard_Standard
then
2752 elsif Ekind
(S
) = E_Function
2753 and then Ekind
(Scope
(S
)) = E_Protected_Type
2762 if Scope
(Nam
) = Prot
and then Ekind
(Nam
) /= E_Function
then
2764 -- An indirect function call (e.g. a callback within a protected
2765 -- function body) is not statically illegal. If the access type is
2766 -- anonymous and is the type of an access parameter, the scope of Nam
2767 -- will be the protected type, but it is not a protected operation.
2769 if Ekind
(Nam
) = E_Subprogram_Type
2771 Nkind
(Associated_Node_For_Itype
(Nam
)) = N_Function_Specification
2775 elsif Nkind
(N
) = N_Subprogram_Renaming_Declaration
then
2777 ("within protected function cannot use protected "
2778 & "procedure in renaming or as generic actual", N
);
2780 elsif Nkind
(N
) = N_Attribute_Reference
then
2782 ("within protected function cannot take access of "
2783 & " protected procedure", N
);
2787 ("within protected function, protected object is constant", N
);
2789 ("\cannot call operation that may modify it", N
);
2792 end Check_Internal_Protected_Use
;
2794 ---------------------------------------
2795 -- Check_Later_Vs_Basic_Declarations --
2796 ---------------------------------------
2798 procedure Check_Later_Vs_Basic_Declarations
2800 During_Parsing
: Boolean)
2802 Body_Sloc
: Source_Ptr
;
2805 function Is_Later_Declarative_Item
(Decl
: Node_Id
) return Boolean;
2806 -- Return whether Decl is considered as a declarative item.
2807 -- When During_Parsing is True, the semantics of Ada 83 is followed.
2808 -- When During_Parsing is False, the semantics of SPARK is followed.
2810 -------------------------------
2811 -- Is_Later_Declarative_Item --
2812 -------------------------------
2814 function Is_Later_Declarative_Item
(Decl
: Node_Id
) return Boolean is
2816 if Nkind
(Decl
) in N_Later_Decl_Item
then
2819 elsif Nkind
(Decl
) = N_Pragma
then
2822 elsif During_Parsing
then
2825 -- In SPARK, a package declaration is not considered as a later
2826 -- declarative item.
2828 elsif Nkind
(Decl
) = N_Package_Declaration
then
2831 -- In SPARK, a renaming is considered as a later declarative item
2833 elsif Nkind
(Decl
) in N_Renaming_Declaration
then
2839 end Is_Later_Declarative_Item
;
2841 -- Start of Check_Later_Vs_Basic_Declarations
2844 Decl
:= First
(Decls
);
2846 -- Loop through sequence of basic declarative items
2848 Outer
: while Present
(Decl
) loop
2849 if not Nkind_In
(Decl
, N_Subprogram_Body
, N_Package_Body
, N_Task_Body
)
2850 and then Nkind
(Decl
) not in N_Body_Stub
2854 -- Once a body is encountered, we only allow later declarative
2855 -- items. The inner loop checks the rest of the list.
2858 Body_Sloc
:= Sloc
(Decl
);
2860 Inner
: while Present
(Decl
) loop
2861 if not Is_Later_Declarative_Item
(Decl
) then
2862 if During_Parsing
then
2863 if Ada_Version
= Ada_83
then
2864 Error_Msg_Sloc
:= Body_Sloc
;
2866 ("(Ada 83) decl cannot appear after body#", Decl
);
2869 Error_Msg_Sloc
:= Body_Sloc
;
2870 Check_SPARK_05_Restriction
2871 ("decl cannot appear after body#", Decl
);
2879 end Check_Later_Vs_Basic_Declarations
;
2881 -------------------------
2882 -- Check_Nested_Access --
2883 -------------------------
2885 procedure Check_Nested_Access
(Ent
: Entity_Id
) is
2886 Scop
: constant Entity_Id
:= Current_Scope
;
2887 Current_Subp
: Entity_Id
;
2888 Enclosing
: Entity_Id
;
2891 -- Currently only enabled for VM back-ends for efficiency, should we
2892 -- enable it more systematically ???
2894 -- Check for Is_Imported needs commenting below ???
2896 if VM_Target
/= No_VM
2897 and then Ekind_In
(Ent
, E_Variable
, E_Constant
, E_Loop_Parameter
)
2898 and then Scope
(Ent
) /= Empty
2899 and then not Is_Library_Level_Entity
(Ent
)
2900 and then not Is_Imported
(Ent
)
2902 if Is_Subprogram
(Scop
)
2903 or else Is_Generic_Subprogram
(Scop
)
2904 or else Is_Entry
(Scop
)
2906 Current_Subp
:= Scop
;
2908 Current_Subp
:= Current_Subprogram
;
2911 Enclosing
:= Enclosing_Subprogram
(Ent
);
2913 if Enclosing
/= Empty
and then Enclosing
/= Current_Subp
then
2914 Set_Has_Up_Level_Access
(Ent
, True);
2917 end Check_Nested_Access
;
2919 ---------------------------
2920 -- Check_No_Hidden_State --
2921 ---------------------------
2923 procedure Check_No_Hidden_State
(Id
: Entity_Id
) is
2924 function Has_Null_Abstract_State
(Pkg
: Entity_Id
) return Boolean;
2925 -- Determine whether the entity of a package denoted by Pkg has a null
2928 -----------------------------
2929 -- Has_Null_Abstract_State --
2930 -----------------------------
2932 function Has_Null_Abstract_State
(Pkg
: Entity_Id
) return Boolean is
2933 States
: constant Elist_Id
:= Abstract_States
(Pkg
);
2936 -- Check first available state of related package. A null abstract
2937 -- state always appears as the sole element of the state list.
2941 and then Is_Null_State
(Node
(First_Elmt
(States
)));
2942 end Has_Null_Abstract_State
;
2946 Context
: Entity_Id
:= Empty
;
2947 Not_Visible
: Boolean := False;
2950 -- Start of processing for Check_No_Hidden_State
2953 pragma Assert
(Ekind_In
(Id
, E_Abstract_State
, E_Variable
));
2955 -- Find the proper context where the object or state appears
2958 while Present
(Scop
) loop
2961 -- Keep track of the context's visibility
2963 Not_Visible
:= Not_Visible
or else In_Private_Part
(Context
);
2965 -- Prevent the search from going too far
2967 if Context
= Standard_Standard
then
2970 -- Objects and states that appear immediately within a subprogram or
2971 -- inside a construct nested within a subprogram do not introduce a
2972 -- hidden state. They behave as local variable declarations.
2974 elsif Is_Subprogram
(Context
) then
2977 -- When examining a package body, use the entity of the spec as it
2978 -- carries the abstract state declarations.
2980 elsif Ekind
(Context
) = E_Package_Body
then
2981 Context
:= Spec_Entity
(Context
);
2984 -- Stop the traversal when a package subject to a null abstract state
2987 if Ekind_In
(Context
, E_Generic_Package
, E_Package
)
2988 and then Has_Null_Abstract_State
(Context
)
2993 Scop
:= Scope
(Scop
);
2996 -- At this point we know that there is at least one package with a null
2997 -- abstract state in visibility. Emit an error message unconditionally
2998 -- if the entity being processed is a state because the placement of the
2999 -- related package is irrelevant. This is not the case for objects as
3000 -- the intermediate context matters.
3002 if Present
(Context
)
3003 and then (Ekind
(Id
) = E_Abstract_State
or else Not_Visible
)
3005 Error_Msg_N
("cannot introduce hidden state &", Id
);
3006 Error_Msg_NE
("\package & has null abstract state", Id
, Context
);
3008 end Check_No_Hidden_State
;
3010 ------------------------------------------
3011 -- Check_Potentially_Blocking_Operation --
3012 ------------------------------------------
3014 procedure Check_Potentially_Blocking_Operation
(N
: Node_Id
) is
3018 -- N is one of the potentially blocking operations listed in 9.5.1(8).
3019 -- When pragma Detect_Blocking is active, the run time will raise
3020 -- Program_Error. Here we only issue a warning, since we generally
3021 -- support the use of potentially blocking operations in the absence
3024 -- Indirect blocking through a subprogram call cannot be diagnosed
3025 -- statically without interprocedural analysis, so we do not attempt
3028 S
:= Scope
(Current_Scope
);
3029 while Present
(S
) and then S
/= Standard_Standard
loop
3030 if Is_Protected_Type
(S
) then
3032 ("potentially blocking operation in protected operation??", N
);
3038 end Check_Potentially_Blocking_Operation
;
3040 ---------------------------------
3041 -- Check_Result_And_Post_State --
3042 ---------------------------------
3044 procedure Check_Result_And_Post_State
3046 Result_Seen
: in out Boolean)
3048 procedure Check_Expression
(Expr
: Node_Id
);
3049 -- Perform the 'Result and post-state checks on a given expression
3051 function Is_Function_Result
(N
: Node_Id
) return Traverse_Result
;
3052 -- Attempt to find attribute 'Result in a subtree denoted by N
3054 function Is_Trivial_Boolean
(N
: Node_Id
) return Boolean;
3055 -- Determine whether source node N denotes "True" or "False"
3057 function Mentions_Post_State
(N
: Node_Id
) return Boolean;
3058 -- Determine whether a subtree denoted by N mentions any construct that
3059 -- denotes a post-state.
3061 procedure Check_Function_Result
is
3062 new Traverse_Proc
(Is_Function_Result
);
3064 ----------------------
3065 -- Check_Expression --
3066 ----------------------
3068 procedure Check_Expression
(Expr
: Node_Id
) is
3070 if not Is_Trivial_Boolean
(Expr
) then
3071 Check_Function_Result
(Expr
);
3073 if not Mentions_Post_State
(Expr
) then
3074 if Pragma_Name
(Prag
) = Name_Contract_Cases
then
3076 ("contract case refers only to pre-state?T?", Expr
);
3078 elsif Pragma_Name
(Prag
) = Name_Refined_Post
then
3080 ("refined postcondition refers only to pre-state?T?",
3085 ("postcondition refers only to pre-state?T?", Prag
);
3089 end Check_Expression
;
3091 ------------------------
3092 -- Is_Function_Result --
3093 ------------------------
3095 function Is_Function_Result
(N
: Node_Id
) return Traverse_Result
is
3097 if Is_Attribute_Result
(N
) then
3098 Result_Seen
:= True;
3101 -- Continue the traversal
3106 end Is_Function_Result
;
3108 ------------------------
3109 -- Is_Trivial_Boolean --
3110 ------------------------
3112 function Is_Trivial_Boolean
(N
: Node_Id
) return Boolean is
3115 Comes_From_Source
(N
)
3116 and then Is_Entity_Name
(N
)
3117 and then (Entity
(N
) = Standard_True
3119 Entity
(N
) = Standard_False
);
3120 end Is_Trivial_Boolean
;
3122 -------------------------
3123 -- Mentions_Post_State --
3124 -------------------------
3126 function Mentions_Post_State
(N
: Node_Id
) return Boolean is
3127 Post_State_Seen
: Boolean := False;
3129 function Is_Post_State
(N
: Node_Id
) return Traverse_Result
;
3130 -- Attempt to find a construct that denotes a post-state. If this is
3131 -- the case, set flag Post_State_Seen.
3137 function Is_Post_State
(N
: Node_Id
) return Traverse_Result
is
3141 if Nkind_In
(N
, N_Explicit_Dereference
, N_Function_Call
) then
3142 Post_State_Seen
:= True;
3145 elsif Nkind_In
(N
, N_Expanded_Name
, N_Identifier
) then
3148 -- The entity may be modifiable through an implicit dereference
3151 or else Ekind
(Ent
) in Assignable_Kind
3152 or else (Is_Access_Type
(Etype
(Ent
))
3153 and then Nkind
(Parent
(N
)) = N_Selected_Component
)
3155 Post_State_Seen
:= True;
3159 elsif Nkind
(N
) = N_Attribute_Reference
then
3160 if Attribute_Name
(N
) = Name_Old
then
3163 elsif Attribute_Name
(N
) = Name_Result
then
3164 Post_State_Seen
:= True;
3172 procedure Find_Post_State
is new Traverse_Proc
(Is_Post_State
);
3174 -- Start of processing for Mentions_Post_State
3177 Find_Post_State
(N
);
3179 return Post_State_Seen
;
3180 end Mentions_Post_State
;
3184 Expr
: constant Node_Id
:=
3185 Get_Pragma_Arg
(First
(Pragma_Argument_Associations
(Prag
)));
3186 Nam
: constant Name_Id
:= Pragma_Name
(Prag
);
3189 -- Start of processing for Check_Result_And_Post_State
3192 -- Examine all consequences
3194 if Nam
= Name_Contract_Cases
then
3195 CCase
:= First
(Component_Associations
(Expr
));
3196 while Present
(CCase
) loop
3197 Check_Expression
(Expression
(CCase
));
3202 -- Examine the expression of a postcondition
3204 else pragma Assert
(Nam_In
(Nam
, Name_Postcondition
, Name_Refined_Post
));
3205 Check_Expression
(Expr
);
3207 end Check_Result_And_Post_State
;
3209 ------------------------------
3210 -- Check_Unprotected_Access --
3211 ------------------------------
3213 procedure Check_Unprotected_Access
3217 Cont_Encl_Typ
: Entity_Id
;
3218 Pref_Encl_Typ
: Entity_Id
;
3220 function Enclosing_Protected_Type
(Obj
: Node_Id
) return Entity_Id
;
3221 -- Check whether Obj is a private component of a protected object.
3222 -- Return the protected type where the component resides, Empty
3225 function Is_Public_Operation
return Boolean;
3226 -- Verify that the enclosing operation is callable from outside the
3227 -- protected object, to minimize false positives.
3229 ------------------------------
3230 -- Enclosing_Protected_Type --
3231 ------------------------------
3233 function Enclosing_Protected_Type
(Obj
: Node_Id
) return Entity_Id
is
3235 if Is_Entity_Name
(Obj
) then
3237 Ent
: Entity_Id
:= Entity
(Obj
);
3240 -- The object can be a renaming of a private component, use
3241 -- the original record component.
3243 if Is_Prival
(Ent
) then
3244 Ent
:= Prival_Link
(Ent
);
3247 if Is_Protected_Type
(Scope
(Ent
)) then
3253 -- For indexed and selected components, recursively check the prefix
3255 if Nkind_In
(Obj
, N_Indexed_Component
, N_Selected_Component
) then
3256 return Enclosing_Protected_Type
(Prefix
(Obj
));
3258 -- The object does not denote a protected component
3263 end Enclosing_Protected_Type
;
3265 -------------------------
3266 -- Is_Public_Operation --
3267 -------------------------
3269 function Is_Public_Operation
return Boolean is
3275 while Present
(S
) and then S
/= Pref_Encl_Typ
loop
3276 if Scope
(S
) = Pref_Encl_Typ
then
3277 E
:= First_Entity
(Pref_Encl_Typ
);
3279 and then E
/= First_Private_Entity
(Pref_Encl_Typ
)
3293 end Is_Public_Operation
;
3295 -- Start of processing for Check_Unprotected_Access
3298 if Nkind
(Expr
) = N_Attribute_Reference
3299 and then Attribute_Name
(Expr
) = Name_Unchecked_Access
3301 Cont_Encl_Typ
:= Enclosing_Protected_Type
(Context
);
3302 Pref_Encl_Typ
:= Enclosing_Protected_Type
(Prefix
(Expr
));
3304 -- Check whether we are trying to export a protected component to a
3305 -- context with an equal or lower access level.
3307 if Present
(Pref_Encl_Typ
)
3308 and then No
(Cont_Encl_Typ
)
3309 and then Is_Public_Operation
3310 and then Scope_Depth
(Pref_Encl_Typ
) >=
3311 Object_Access_Level
(Context
)
3314 ("??possible unprotected access to protected data", Expr
);
3317 end Check_Unprotected_Access
;
3319 ------------------------
3320 -- Collect_Interfaces --
3321 ------------------------
3323 procedure Collect_Interfaces
3325 Ifaces_List
: out Elist_Id
;
3326 Exclude_Parents
: Boolean := False;
3327 Use_Full_View
: Boolean := True)
3329 procedure Collect
(Typ
: Entity_Id
);
3330 -- Subsidiary subprogram used to traverse the whole list
3331 -- of directly and indirectly implemented interfaces
3337 procedure Collect
(Typ
: Entity_Id
) is
3338 Ancestor
: Entity_Id
;
3346 -- Handle private types
3349 and then Is_Private_Type
(Typ
)
3350 and then Present
(Full_View
(Typ
))
3352 Full_T
:= Full_View
(Typ
);
3355 -- Include the ancestor if we are generating the whole list of
3356 -- abstract interfaces.
3358 if Etype
(Full_T
) /= Typ
3360 -- Protect the frontend against wrong sources. For example:
3363 -- type A is tagged null record;
3364 -- type B is new A with private;
3365 -- type C is new A with private;
3367 -- type B is new C with null record;
3368 -- type C is new B with null record;
3371 and then Etype
(Full_T
) /= T
3373 Ancestor
:= Etype
(Full_T
);
3376 if Is_Interface
(Ancestor
) and then not Exclude_Parents
then
3377 Append_Unique_Elmt
(Ancestor
, Ifaces_List
);
3381 -- Traverse the graph of ancestor interfaces
3383 if Is_Non_Empty_List
(Abstract_Interface_List
(Full_T
)) then
3384 Id
:= First
(Abstract_Interface_List
(Full_T
));
3385 while Present
(Id
) loop
3386 Iface
:= Etype
(Id
);
3388 -- Protect against wrong uses. For example:
3389 -- type I is interface;
3390 -- type O is tagged null record;
3391 -- type Wrong is new I and O with null record; -- ERROR
3393 if Is_Interface
(Iface
) then
3395 and then Etype
(T
) /= T
3396 and then Interface_Present_In_Ancestor
(Etype
(T
), Iface
)
3401 Append_Unique_Elmt
(Iface
, Ifaces_List
);
3410 -- Start of processing for Collect_Interfaces
3413 pragma Assert
(Is_Tagged_Type
(T
) or else Is_Concurrent_Type
(T
));
3414 Ifaces_List
:= New_Elmt_List
;
3416 end Collect_Interfaces
;
3418 ----------------------------------
3419 -- Collect_Interface_Components --
3420 ----------------------------------
3422 procedure Collect_Interface_Components
3423 (Tagged_Type
: Entity_Id
;
3424 Components_List
: out Elist_Id
)
3426 procedure Collect
(Typ
: Entity_Id
);
3427 -- Subsidiary subprogram used to climb to the parents
3433 procedure Collect
(Typ
: Entity_Id
) is
3434 Tag_Comp
: Entity_Id
;
3435 Parent_Typ
: Entity_Id
;
3438 -- Handle private types
3440 if Present
(Full_View
(Etype
(Typ
))) then
3441 Parent_Typ
:= Full_View
(Etype
(Typ
));
3443 Parent_Typ
:= Etype
(Typ
);
3446 if Parent_Typ
/= Typ
3448 -- Protect the frontend against wrong sources. For example:
3451 -- type A is tagged null record;
3452 -- type B is new A with private;
3453 -- type C is new A with private;
3455 -- type B is new C with null record;
3456 -- type C is new B with null record;
3459 and then Parent_Typ
/= Tagged_Type
3461 Collect
(Parent_Typ
);
3464 -- Collect the components containing tags of secondary dispatch
3467 Tag_Comp
:= Next_Tag_Component
(First_Tag_Component
(Typ
));
3468 while Present
(Tag_Comp
) loop
3469 pragma Assert
(Present
(Related_Type
(Tag_Comp
)));
3470 Append_Elmt
(Tag_Comp
, Components_List
);
3472 Tag_Comp
:= Next_Tag_Component
(Tag_Comp
);
3476 -- Start of processing for Collect_Interface_Components
3479 pragma Assert
(Ekind
(Tagged_Type
) = E_Record_Type
3480 and then Is_Tagged_Type
(Tagged_Type
));
3482 Components_List
:= New_Elmt_List
;
3483 Collect
(Tagged_Type
);
3484 end Collect_Interface_Components
;
3486 -----------------------------
3487 -- Collect_Interfaces_Info --
3488 -----------------------------
3490 procedure Collect_Interfaces_Info
3492 Ifaces_List
: out Elist_Id
;
3493 Components_List
: out Elist_Id
;
3494 Tags_List
: out Elist_Id
)
3496 Comps_List
: Elist_Id
;
3497 Comp_Elmt
: Elmt_Id
;
3498 Comp_Iface
: Entity_Id
;
3499 Iface_Elmt
: Elmt_Id
;
3502 function Search_Tag
(Iface
: Entity_Id
) return Entity_Id
;
3503 -- Search for the secondary tag associated with the interface type
3504 -- Iface that is implemented by T.
3510 function Search_Tag
(Iface
: Entity_Id
) return Entity_Id
is
3513 if not Is_CPP_Class
(T
) then
3514 ADT
:= Next_Elmt
(Next_Elmt
(First_Elmt
(Access_Disp_Table
(T
))));
3516 ADT
:= Next_Elmt
(First_Elmt
(Access_Disp_Table
(T
)));
3520 and then Is_Tag
(Node
(ADT
))
3521 and then Related_Type
(Node
(ADT
)) /= Iface
3523 -- Skip secondary dispatch table referencing thunks to user
3524 -- defined primitives covered by this interface.
3526 pragma Assert
(Has_Suffix
(Node
(ADT
), 'P'));
3529 -- Skip secondary dispatch tables of Ada types
3531 if not Is_CPP_Class
(T
) then
3533 -- Skip secondary dispatch table referencing thunks to
3534 -- predefined primitives.
3536 pragma Assert
(Has_Suffix
(Node
(ADT
), 'Y'));
3539 -- Skip secondary dispatch table referencing user-defined
3540 -- primitives covered by this interface.
3542 pragma Assert
(Has_Suffix
(Node
(ADT
), 'D'));
3545 -- Skip secondary dispatch table referencing predefined
3548 pragma Assert
(Has_Suffix
(Node
(ADT
), 'Z'));
3553 pragma Assert
(Is_Tag
(Node
(ADT
)));
3557 -- Start of processing for Collect_Interfaces_Info
3560 Collect_Interfaces
(T
, Ifaces_List
);
3561 Collect_Interface_Components
(T
, Comps_List
);
3563 -- Search for the record component and tag associated with each
3564 -- interface type of T.
3566 Components_List
:= New_Elmt_List
;
3567 Tags_List
:= New_Elmt_List
;
3569 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
3570 while Present
(Iface_Elmt
) loop
3571 Iface
:= Node
(Iface_Elmt
);
3573 -- Associate the primary tag component and the primary dispatch table
3574 -- with all the interfaces that are parents of T
3576 if Is_Ancestor
(Iface
, T
, Use_Full_View
=> True) then
3577 Append_Elmt
(First_Tag_Component
(T
), Components_List
);
3578 Append_Elmt
(Node
(First_Elmt
(Access_Disp_Table
(T
))), Tags_List
);
3580 -- Otherwise search for the tag component and secondary dispatch
3584 Comp_Elmt
:= First_Elmt
(Comps_List
);
3585 while Present
(Comp_Elmt
) loop
3586 Comp_Iface
:= Related_Type
(Node
(Comp_Elmt
));
3588 if Comp_Iface
= Iface
3589 or else Is_Ancestor
(Iface
, Comp_Iface
, Use_Full_View
=> True)
3591 Append_Elmt
(Node
(Comp_Elmt
), Components_List
);
3592 Append_Elmt
(Search_Tag
(Comp_Iface
), Tags_List
);
3596 Next_Elmt
(Comp_Elmt
);
3598 pragma Assert
(Present
(Comp_Elmt
));
3601 Next_Elmt
(Iface_Elmt
);
3603 end Collect_Interfaces_Info
;
3605 ---------------------
3606 -- Collect_Parents --
3607 ---------------------
3609 procedure Collect_Parents
3611 List
: out Elist_Id
;
3612 Use_Full_View
: Boolean := True)
3614 Current_Typ
: Entity_Id
:= T
;
3615 Parent_Typ
: Entity_Id
;
3618 List
:= New_Elmt_List
;
3620 -- No action if the if the type has no parents
3622 if T
= Etype
(T
) then
3627 Parent_Typ
:= Etype
(Current_Typ
);
3629 if Is_Private_Type
(Parent_Typ
)
3630 and then Present
(Full_View
(Parent_Typ
))
3631 and then Use_Full_View
3633 Parent_Typ
:= Full_View
(Base_Type
(Parent_Typ
));
3636 Append_Elmt
(Parent_Typ
, List
);
3638 exit when Parent_Typ
= Current_Typ
;
3639 Current_Typ
:= Parent_Typ
;
3641 end Collect_Parents
;
3643 ----------------------------------
3644 -- Collect_Primitive_Operations --
3645 ----------------------------------
3647 function Collect_Primitive_Operations
(T
: Entity_Id
) return Elist_Id
is
3648 B_Type
: constant Entity_Id
:= Base_Type
(T
);
3649 B_Decl
: constant Node_Id
:= Original_Node
(Parent
(B_Type
));
3650 B_Scope
: Entity_Id
:= Scope
(B_Type
);
3654 Is_Type_In_Pkg
: Boolean;
3655 Formal_Derived
: Boolean := False;
3658 function Match
(E
: Entity_Id
) return Boolean;
3659 -- True if E's base type is B_Type, or E is of an anonymous access type
3660 -- and the base type of its designated type is B_Type.
3666 function Match
(E
: Entity_Id
) return Boolean is
3667 Etyp
: Entity_Id
:= Etype
(E
);
3670 if Ekind
(Etyp
) = E_Anonymous_Access_Type
then
3671 Etyp
:= Designated_Type
(Etyp
);
3674 -- In Ada 2012 a primitive operation may have a formal of an
3675 -- incomplete view of the parent type.
3677 return Base_Type
(Etyp
) = B_Type
3679 (Ada_Version
>= Ada_2012
3680 and then Ekind
(Etyp
) = E_Incomplete_Type
3681 and then Full_View
(Etyp
) = B_Type
);
3684 -- Start of processing for Collect_Primitive_Operations
3687 -- For tagged types, the primitive operations are collected as they
3688 -- are declared, and held in an explicit list which is simply returned.
3690 if Is_Tagged_Type
(B_Type
) then
3691 return Primitive_Operations
(B_Type
);
3693 -- An untagged generic type that is a derived type inherits the
3694 -- primitive operations of its parent type. Other formal types only
3695 -- have predefined operators, which are not explicitly represented.
3697 elsif Is_Generic_Type
(B_Type
) then
3698 if Nkind
(B_Decl
) = N_Formal_Type_Declaration
3699 and then Nkind
(Formal_Type_Definition
(B_Decl
)) =
3700 N_Formal_Derived_Type_Definition
3702 Formal_Derived
:= True;
3704 return New_Elmt_List
;
3708 Op_List
:= New_Elmt_List
;
3710 if B_Scope
= Standard_Standard
then
3711 if B_Type
= Standard_String
then
3712 Append_Elmt
(Standard_Op_Concat
, Op_List
);
3714 elsif B_Type
= Standard_Wide_String
then
3715 Append_Elmt
(Standard_Op_Concatw
, Op_List
);
3721 -- Locate the primitive subprograms of the type
3724 -- The primitive operations appear after the base type, except
3725 -- if the derivation happens within the private part of B_Scope
3726 -- and the type is a private type, in which case both the type
3727 -- and some primitive operations may appear before the base
3728 -- type, and the list of candidates starts after the type.
3730 if In_Open_Scopes
(B_Scope
)
3731 and then Scope
(T
) = B_Scope
3732 and then In_Private_Part
(B_Scope
)
3734 Id
:= Next_Entity
(T
);
3736 -- In Ada 2012, If the type has an incomplete partial view, there
3737 -- may be primitive operations declared before the full view, so
3738 -- we need to start scanning from the incomplete view, which is
3739 -- earlier on the entity chain.
3741 elsif Nkind
(Parent
(B_Type
)) = N_Full_Type_Declaration
3742 and then Present
(Incomplete_View
(Parent
(B_Type
)))
3744 Id
:= Defining_Entity
(Incomplete_View
(Parent
(B_Type
)));
3747 Id
:= Next_Entity
(B_Type
);
3750 -- Set flag if this is a type in a package spec
3753 Is_Package_Or_Generic_Package
(B_Scope
)
3755 Nkind
(Parent
(Declaration_Node
(First_Subtype
(T
)))) /=
3758 while Present
(Id
) loop
3760 -- Test whether the result type or any of the parameter types of
3761 -- each subprogram following the type match that type when the
3762 -- type is declared in a package spec, is a derived type, or the
3763 -- subprogram is marked as primitive. (The Is_Primitive test is
3764 -- needed to find primitives of nonderived types in declarative
3765 -- parts that happen to override the predefined "=" operator.)
3767 -- Note that generic formal subprograms are not considered to be
3768 -- primitive operations and thus are never inherited.
3770 if Is_Overloadable
(Id
)
3771 and then (Is_Type_In_Pkg
3772 or else Is_Derived_Type
(B_Type
)
3773 or else Is_Primitive
(Id
))
3774 and then Nkind
(Parent
(Parent
(Id
)))
3775 not in N_Formal_Subprogram_Declaration
3783 Formal
:= First_Formal
(Id
);
3784 while Present
(Formal
) loop
3785 if Match
(Formal
) then
3790 Next_Formal
(Formal
);
3794 -- For a formal derived type, the only primitives are the ones
3795 -- inherited from the parent type. Operations appearing in the
3796 -- package declaration are not primitive for it.
3799 and then (not Formal_Derived
or else Present
(Alias
(Id
)))
3801 -- In the special case of an equality operator aliased to
3802 -- an overriding dispatching equality belonging to the same
3803 -- type, we don't include it in the list of primitives.
3804 -- This avoids inheriting multiple equality operators when
3805 -- deriving from untagged private types whose full type is
3806 -- tagged, which can otherwise cause ambiguities. Note that
3807 -- this should only happen for this kind of untagged parent
3808 -- type, since normally dispatching operations are inherited
3809 -- using the type's Primitive_Operations list.
3811 if Chars
(Id
) = Name_Op_Eq
3812 and then Is_Dispatching_Operation
(Id
)
3813 and then Present
(Alias
(Id
))
3814 and then Present
(Overridden_Operation
(Alias
(Id
)))
3815 and then Base_Type
(Etype
(First_Entity
(Id
))) =
3816 Base_Type
(Etype
(First_Entity
(Alias
(Id
))))
3820 -- Include the subprogram in the list of primitives
3823 Append_Elmt
(Id
, Op_List
);
3830 -- For a type declared in System, some of its operations may
3831 -- appear in the target-specific extension to System.
3834 and then B_Scope
= RTU_Entity
(System
)
3835 and then Present_System_Aux
3837 B_Scope
:= System_Aux_Id
;
3838 Id
:= First_Entity
(System_Aux_Id
);
3844 end Collect_Primitive_Operations
;
3846 -----------------------------------
3847 -- Compile_Time_Constraint_Error --
3848 -----------------------------------
3850 function Compile_Time_Constraint_Error
3853 Ent
: Entity_Id
:= Empty
;
3854 Loc
: Source_Ptr
:= No_Location
;
3855 Warn
: Boolean := False) return Node_Id
3857 Msgc
: String (1 .. Msg
'Length + 3);
3858 -- Copy of message, with room for possible ?? or << and ! at end
3864 -- Start of processing for Compile_Time_Constraint_Error
3867 -- If this is a warning, convert it into an error if we are in code
3868 -- subject to SPARK_Mode being set ON.
3870 Error_Msg_Warn
:= SPARK_Mode
/= On
;
3872 -- A static constraint error in an instance body is not a fatal error.
3873 -- we choose to inhibit the message altogether, because there is no
3874 -- obvious node (for now) on which to post it. On the other hand the
3875 -- offending node must be replaced with a constraint_error in any case.
3877 -- No messages are generated if we already posted an error on this node
3879 if not Error_Posted
(N
) then
3880 if Loc
/= No_Location
then
3886 -- Copy message to Msgc, converting any ? in the message into
3887 -- < instead, so that we have an error in GNATprove mode.
3891 for J
in 1 .. Msgl
loop
3892 if Msg
(J
) = '?' and then (J
= 1 or else Msg
(J
) /= ''') then
3895 Msgc
(J
) := Msg
(J
);
3899 -- Message is a warning, even in Ada 95 case
3901 if Msg
(Msg
'Last) = '?' or else Msg
(Msg
'Last) = '<' then
3904 -- In Ada 83, all messages are warnings. In the private part and
3905 -- the body of an instance, constraint_checks are only warnings.
3906 -- We also make this a warning if the Warn parameter is set.
3909 or else (Ada_Version
= Ada_83
and then Comes_From_Source
(N
))
3917 elsif In_Instance_Not_Visible
then
3924 -- Otherwise we have a real error message (Ada 95 static case)
3925 -- and we make this an unconditional message. Note that in the
3926 -- warning case we do not make the message unconditional, it seems
3927 -- quite reasonable to delete messages like this (about exceptions
3928 -- that will be raised) in dead code.
3936 -- One more test, skip the warning if the related expression is
3937 -- statically unevaluated, since we don't want to warn about what
3938 -- will happen when something is evaluated if it never will be
3941 if not Is_Statically_Unevaluated
(N
) then
3942 Error_Msg_Warn
:= SPARK_Mode
/= On
;
3944 if Present
(Ent
) then
3945 Error_Msg_NEL
(Msgc
(1 .. Msgl
), N
, Ent
, Eloc
);
3947 Error_Msg_NEL
(Msgc
(1 .. Msgl
), N
, Etype
(N
), Eloc
);
3952 -- Check whether the context is an Init_Proc
3954 if Inside_Init_Proc
then
3956 Conc_Typ
: constant Entity_Id
:=
3957 Corresponding_Concurrent_Type
3958 (Entity
(Parameter_Type
(First
3959 (Parameter_Specifications
3960 (Parent
(Current_Scope
))))));
3963 -- Don't complain if the corresponding concurrent type
3964 -- doesn't come from source (i.e. a single task/protected
3967 if Present
(Conc_Typ
)
3968 and then not Comes_From_Source
(Conc_Typ
)
3971 ("\& [<<", N
, Standard_Constraint_Error
, Eloc
);
3974 if GNATprove_Mode
then
3976 ("\& would have been raised for objects of this "
3977 & "type", N
, Standard_Constraint_Error
, Eloc
);
3980 ("\& will be raised for objects of this type??",
3981 N
, Standard_Constraint_Error
, Eloc
);
3987 Error_Msg_NEL
("\& [<<", N
, Standard_Constraint_Error
, Eloc
);
3991 Error_Msg
("\static expression fails Constraint_Check", Eloc
);
3992 Set_Error_Posted
(N
);
3998 end Compile_Time_Constraint_Error
;
4000 -----------------------
4001 -- Conditional_Delay --
4002 -----------------------
4004 procedure Conditional_Delay
(New_Ent
, Old_Ent
: Entity_Id
) is
4006 if Has_Delayed_Freeze
(Old_Ent
) and then not Is_Frozen
(Old_Ent
) then
4007 Set_Has_Delayed_Freeze
(New_Ent
);
4009 end Conditional_Delay
;
4011 ----------------------------
4012 -- Contains_Refined_State --
4013 ----------------------------
4015 function Contains_Refined_State
(Prag
: Node_Id
) return Boolean is
4016 function Has_State_In_Dependency
(List
: Node_Id
) return Boolean;
4017 -- Determine whether a dependency list mentions a state with a visible
4020 function Has_State_In_Global
(List
: Node_Id
) return Boolean;
4021 -- Determine whether a global list mentions a state with a visible
4024 function Is_Refined_State
(Item
: Node_Id
) return Boolean;
4025 -- Determine whether Item is a reference to an abstract state with a
4026 -- visible refinement.
4028 -----------------------------
4029 -- Has_State_In_Dependency --
4030 -----------------------------
4032 function Has_State_In_Dependency
(List
: Node_Id
) return Boolean is
4037 -- A null dependency list does not mention any states
4039 if Nkind
(List
) = N_Null
then
4042 -- Dependency clauses appear as component associations of an
4045 elsif Nkind
(List
) = N_Aggregate
4046 and then Present
(Component_Associations
(List
))
4048 Clause
:= First
(Component_Associations
(List
));
4049 while Present
(Clause
) loop
4051 -- Inspect the outputs of a dependency clause
4053 Output
:= First
(Choices
(Clause
));
4054 while Present
(Output
) loop
4055 if Is_Refined_State
(Output
) then
4062 -- Inspect the outputs of a dependency clause
4064 if Is_Refined_State
(Expression
(Clause
)) then
4071 -- If we get here, then none of the dependency clauses mention a
4072 -- state with visible refinement.
4076 -- An illegal pragma managed to sneak in
4079 raise Program_Error
;
4081 end Has_State_In_Dependency
;
4083 -------------------------
4084 -- Has_State_In_Global --
4085 -------------------------
4087 function Has_State_In_Global
(List
: Node_Id
) return Boolean is
4091 -- A null global list does not mention any states
4093 if Nkind
(List
) = N_Null
then
4096 -- Simple global list or moded global list declaration
4098 elsif Nkind
(List
) = N_Aggregate
then
4100 -- The declaration of a simple global list appear as a collection
4103 if Present
(Expressions
(List
)) then
4104 Item
:= First
(Expressions
(List
));
4105 while Present
(Item
) loop
4106 if Is_Refined_State
(Item
) then
4113 -- The declaration of a moded global list appears as a collection
4114 -- of component associations where individual choices denote
4118 Item
:= First
(Component_Associations
(List
));
4119 while Present
(Item
) loop
4120 if Has_State_In_Global
(Expression
(Item
)) then
4128 -- If we get here, then the simple/moded global list did not
4129 -- mention any states with a visible refinement.
4133 -- Single global item declaration
4135 elsif Is_Entity_Name
(List
) then
4136 return Is_Refined_State
(List
);
4138 -- An illegal pragma managed to sneak in
4141 raise Program_Error
;
4143 end Has_State_In_Global
;
4145 ----------------------
4146 -- Is_Refined_State --
4147 ----------------------
4149 function Is_Refined_State
(Item
: Node_Id
) return Boolean is
4151 Item_Id
: Entity_Id
;
4154 if Nkind
(Item
) = N_Null
then
4157 -- States cannot be subject to attribute 'Result. This case arises
4158 -- in dependency relations.
4160 elsif Nkind
(Item
) = N_Attribute_Reference
4161 and then Attribute_Name
(Item
) = Name_Result
4165 -- Multiple items appear as an aggregate. This case arises in
4166 -- dependency relations.
4168 elsif Nkind
(Item
) = N_Aggregate
4169 and then Present
(Expressions
(Item
))
4171 Elmt
:= First
(Expressions
(Item
));
4172 while Present
(Elmt
) loop
4173 if Is_Refined_State
(Elmt
) then
4180 -- If we get here, then none of the inputs or outputs reference a
4181 -- state with visible refinement.
4188 Item_Id
:= Entity_Of
(Item
);
4192 and then Ekind
(Item_Id
) = E_Abstract_State
4193 and then Has_Visible_Refinement
(Item_Id
);
4195 end Is_Refined_State
;
4199 Arg
: constant Node_Id
:=
4200 Get_Pragma_Arg
(First
(Pragma_Argument_Associations
(Prag
)));
4201 Nam
: constant Name_Id
:= Pragma_Name
(Prag
);
4203 -- Start of processing for Contains_Refined_State
4206 if Nam
= Name_Depends
then
4207 return Has_State_In_Dependency
(Arg
);
4209 else pragma Assert
(Nam
= Name_Global
);
4210 return Has_State_In_Global
(Arg
);
4212 end Contains_Refined_State
;
4214 -------------------------
4215 -- Copy_Component_List --
4216 -------------------------
4218 function Copy_Component_List
4220 Loc
: Source_Ptr
) return List_Id
4223 Comps
: constant List_Id
:= New_List
;
4226 Comp
:= First_Component
(Underlying_Type
(R_Typ
));
4227 while Present
(Comp
) loop
4228 if Comes_From_Source
(Comp
) then
4230 Comp_Decl
: constant Node_Id
:= Declaration_Node
(Comp
);
4233 Make_Component_Declaration
(Loc
,
4234 Defining_Identifier
=>
4235 Make_Defining_Identifier
(Loc
, Chars
(Comp
)),
4236 Component_Definition
=>
4238 (Component_Definition
(Comp_Decl
), New_Sloc
=> Loc
)));
4242 Next_Component
(Comp
);
4246 end Copy_Component_List
;
4248 -------------------------
4249 -- Copy_Parameter_List --
4250 -------------------------
4252 function Copy_Parameter_List
(Subp_Id
: Entity_Id
) return List_Id
is
4253 Loc
: constant Source_Ptr
:= Sloc
(Subp_Id
);
4258 if No
(First_Formal
(Subp_Id
)) then
4262 Formal
:= First_Formal
(Subp_Id
);
4263 while Present
(Formal
) loop
4265 (Make_Parameter_Specification
(Loc
,
4266 Defining_Identifier
=>
4267 Make_Defining_Identifier
(Sloc
(Formal
),
4268 Chars
=> Chars
(Formal
)),
4269 In_Present
=> In_Present
(Parent
(Formal
)),
4270 Out_Present
=> Out_Present
(Parent
(Formal
)),
4272 New_Occurrence_Of
(Etype
(Formal
), Loc
),
4274 New_Copy_Tree
(Expression
(Parent
(Formal
)))),
4277 Next_Formal
(Formal
);
4282 end Copy_Parameter_List
;
4284 --------------------------------
4285 -- Corresponding_Generic_Type --
4286 --------------------------------
4288 function Corresponding_Generic_Type
(T
: Entity_Id
) return Entity_Id
is
4294 if not Is_Generic_Actual_Type
(T
) then
4297 -- If the actual is the actual of an enclosing instance, resolution
4298 -- was correct in the generic.
4300 elsif Nkind
(Parent
(T
)) = N_Subtype_Declaration
4301 and then Is_Entity_Name
(Subtype_Indication
(Parent
(T
)))
4303 Is_Generic_Actual_Type
(Entity
(Subtype_Indication
(Parent
(T
))))
4310 if Is_Wrapper_Package
(Inst
) then
4311 Inst
:= Related_Instance
(Inst
);
4316 (Specification
(Unit_Declaration_Node
(Inst
)));
4318 -- Generic actual has the same name as the corresponding formal
4320 Typ
:= First_Entity
(Gen
);
4321 while Present
(Typ
) loop
4322 if Chars
(Typ
) = Chars
(T
) then
4331 end Corresponding_Generic_Type
;
4333 --------------------
4334 -- Current_Entity --
4335 --------------------
4337 -- The currently visible definition for a given identifier is the
4338 -- one most chained at the start of the visibility chain, i.e. the
4339 -- one that is referenced by the Node_Id value of the name of the
4340 -- given identifier.
4342 function Current_Entity
(N
: Node_Id
) return Entity_Id
is
4344 return Get_Name_Entity_Id
(Chars
(N
));
4347 -----------------------------
4348 -- Current_Entity_In_Scope --
4349 -----------------------------
4351 function Current_Entity_In_Scope
(N
: Node_Id
) return Entity_Id
is
4353 CS
: constant Entity_Id
:= Current_Scope
;
4355 Transient_Case
: constant Boolean := Scope_Is_Transient
;
4358 E
:= Get_Name_Entity_Id
(Chars
(N
));
4360 and then Scope
(E
) /= CS
4361 and then (not Transient_Case
or else Scope
(E
) /= Scope
(CS
))
4367 end Current_Entity_In_Scope
;
4373 function Current_Scope
return Entity_Id
is
4375 if Scope_Stack
.Last
= -1 then
4376 return Standard_Standard
;
4379 C
: constant Entity_Id
:=
4380 Scope_Stack
.Table
(Scope_Stack
.Last
).Entity
;
4385 return Standard_Standard
;
4391 ------------------------
4392 -- Current_Subprogram --
4393 ------------------------
4395 function Current_Subprogram
return Entity_Id
is
4396 Scop
: constant Entity_Id
:= Current_Scope
;
4398 if Is_Subprogram_Or_Generic_Subprogram
(Scop
) then
4401 return Enclosing_Subprogram
(Scop
);
4403 end Current_Subprogram
;
4405 ----------------------------------
4406 -- Deepest_Type_Access_Level --
4407 ----------------------------------
4409 function Deepest_Type_Access_Level
(Typ
: Entity_Id
) return Uint
is
4411 if Ekind
(Typ
) = E_Anonymous_Access_Type
4412 and then not Is_Local_Anonymous_Access
(Typ
)
4413 and then Nkind
(Associated_Node_For_Itype
(Typ
)) = N_Object_Declaration
4415 -- Typ is the type of an Ada 2012 stand-alone object of an anonymous
4419 Scope_Depth
(Enclosing_Dynamic_Scope
4420 (Defining_Identifier
4421 (Associated_Node_For_Itype
(Typ
))));
4423 -- For generic formal type, return Int'Last (infinite).
4424 -- See comment preceding Is_Generic_Type call in Type_Access_Level.
4426 elsif Is_Generic_Type
(Root_Type
(Typ
)) then
4427 return UI_From_Int
(Int
'Last);
4430 return Type_Access_Level
(Typ
);
4432 end Deepest_Type_Access_Level
;
4434 ---------------------
4435 -- Defining_Entity --
4436 ---------------------
4438 function Defining_Entity
(N
: Node_Id
) return Entity_Id
is
4439 K
: constant Node_Kind
:= Nkind
(N
);
4440 Err
: Entity_Id
:= Empty
;
4445 N_Subprogram_Declaration |
4446 N_Abstract_Subprogram_Declaration |
4448 N_Package_Declaration |
4449 N_Subprogram_Renaming_Declaration |
4450 N_Subprogram_Body_Stub |
4451 N_Generic_Subprogram_Declaration |
4452 N_Generic_Package_Declaration |
4453 N_Formal_Subprogram_Declaration |
4454 N_Expression_Function
4456 return Defining_Entity
(Specification
(N
));
4459 N_Component_Declaration |
4460 N_Defining_Program_Unit_Name |
4461 N_Discriminant_Specification |
4463 N_Entry_Declaration |
4464 N_Entry_Index_Specification |
4465 N_Exception_Declaration |
4466 N_Exception_Renaming_Declaration |
4467 N_Formal_Object_Declaration |
4468 N_Formal_Package_Declaration |
4469 N_Formal_Type_Declaration |
4470 N_Full_Type_Declaration |
4471 N_Implicit_Label_Declaration |
4472 N_Incomplete_Type_Declaration |
4473 N_Loop_Parameter_Specification |
4474 N_Number_Declaration |
4475 N_Object_Declaration |
4476 N_Object_Renaming_Declaration |
4477 N_Package_Body_Stub |
4478 N_Parameter_Specification |
4479 N_Private_Extension_Declaration |
4480 N_Private_Type_Declaration |
4482 N_Protected_Body_Stub |
4483 N_Protected_Type_Declaration |
4484 N_Single_Protected_Declaration |
4485 N_Single_Task_Declaration |
4486 N_Subtype_Declaration |
4489 N_Task_Type_Declaration
4491 return Defining_Identifier
(N
);
4494 return Defining_Entity
(Proper_Body
(N
));
4497 N_Function_Instantiation |
4498 N_Function_Specification |
4499 N_Generic_Function_Renaming_Declaration |
4500 N_Generic_Package_Renaming_Declaration |
4501 N_Generic_Procedure_Renaming_Declaration |
4503 N_Package_Instantiation |
4504 N_Package_Renaming_Declaration |
4505 N_Package_Specification |
4506 N_Procedure_Instantiation |
4507 N_Procedure_Specification
4510 Nam
: constant Node_Id
:= Defining_Unit_Name
(N
);
4513 if Nkind
(Nam
) in N_Entity
then
4516 -- For Error, make up a name and attach to declaration
4517 -- so we can continue semantic analysis
4519 elsif Nam
= Error
then
4520 Err
:= Make_Temporary
(Sloc
(N
), 'T');
4521 Set_Defining_Unit_Name
(N
, Err
);
4525 -- If not an entity, get defining identifier
4528 return Defining_Identifier
(Nam
);
4536 return Entity
(Identifier
(N
));
4539 raise Program_Error
;
4542 end Defining_Entity
;
4544 --------------------------
4545 -- Denotes_Discriminant --
4546 --------------------------
4548 function Denotes_Discriminant
4550 Check_Concurrent
: Boolean := False) return Boolean
4555 if not Is_Entity_Name
(N
) or else No
(Entity
(N
)) then
4561 -- If we are checking for a protected type, the discriminant may have
4562 -- been rewritten as the corresponding discriminal of the original type
4563 -- or of the corresponding concurrent record, depending on whether we
4564 -- are in the spec or body of the protected type.
4566 return Ekind
(E
) = E_Discriminant
4569 and then Ekind
(E
) = E_In_Parameter
4570 and then Present
(Discriminal_Link
(E
))
4572 (Is_Concurrent_Type
(Scope
(Discriminal_Link
(E
)))
4574 Is_Concurrent_Record_Type
(Scope
(Discriminal_Link
(E
)))));
4576 end Denotes_Discriminant
;
4578 -------------------------
4579 -- Denotes_Same_Object --
4580 -------------------------
4582 function Denotes_Same_Object
(A1
, A2
: Node_Id
) return Boolean is
4583 Obj1
: Node_Id
:= A1
;
4584 Obj2
: Node_Id
:= A2
;
4586 function Has_Prefix
(N
: Node_Id
) return Boolean;
4587 -- Return True if N has attribute Prefix
4589 function Is_Renaming
(N
: Node_Id
) return Boolean;
4590 -- Return true if N names a renaming entity
4592 function Is_Valid_Renaming
(N
: Node_Id
) return Boolean;
4593 -- For renamings, return False if the prefix of any dereference within
4594 -- the renamed object_name is a variable, or any expression within the
4595 -- renamed object_name contains references to variables or calls on
4596 -- nonstatic functions; otherwise return True (RM 6.4.1(6.10/3))
4602 function Has_Prefix
(N
: Node_Id
) return Boolean is
4606 N_Attribute_Reference
,
4608 N_Explicit_Dereference
,
4609 N_Indexed_Component
,
4611 N_Selected_Component
,
4619 function Is_Renaming
(N
: Node_Id
) return Boolean is
4621 return Is_Entity_Name
(N
)
4622 and then Present
(Renamed_Entity
(Entity
(N
)));
4625 -----------------------
4626 -- Is_Valid_Renaming --
4627 -----------------------
4629 function Is_Valid_Renaming
(N
: Node_Id
) return Boolean is
4631 function Check_Renaming
(N
: Node_Id
) return Boolean;
4632 -- Recursive function used to traverse all the prefixes of N
4634 function Check_Renaming
(N
: Node_Id
) return Boolean is
4637 and then not Check_Renaming
(Renamed_Entity
(Entity
(N
)))
4642 if Nkind
(N
) = N_Indexed_Component
then
4647 Indx
:= First
(Expressions
(N
));
4648 while Present
(Indx
) loop
4649 if not Is_OK_Static_Expression
(Indx
) then
4658 if Has_Prefix
(N
) then
4660 P
: constant Node_Id
:= Prefix
(N
);
4663 if Nkind
(N
) = N_Explicit_Dereference
4664 and then Is_Variable
(P
)
4668 elsif Is_Entity_Name
(P
)
4669 and then Ekind
(Entity
(P
)) = E_Function
4673 elsif Nkind
(P
) = N_Function_Call
then
4677 -- Recursion to continue traversing the prefix of the
4678 -- renaming expression
4680 return Check_Renaming
(P
);
4687 -- Start of processing for Is_Valid_Renaming
4690 return Check_Renaming
(N
);
4691 end Is_Valid_Renaming
;
4693 -- Start of processing for Denotes_Same_Object
4696 -- Both names statically denote the same stand-alone object or parameter
4697 -- (RM 6.4.1(6.5/3))
4699 if Is_Entity_Name
(Obj1
)
4700 and then Is_Entity_Name
(Obj2
)
4701 and then Entity
(Obj1
) = Entity
(Obj2
)
4706 -- For renamings, the prefix of any dereference within the renamed
4707 -- object_name is not a variable, and any expression within the
4708 -- renamed object_name contains no references to variables nor
4709 -- calls on nonstatic functions (RM 6.4.1(6.10/3)).
4711 if Is_Renaming
(Obj1
) then
4712 if Is_Valid_Renaming
(Obj1
) then
4713 Obj1
:= Renamed_Entity
(Entity
(Obj1
));
4719 if Is_Renaming
(Obj2
) then
4720 if Is_Valid_Renaming
(Obj2
) then
4721 Obj2
:= Renamed_Entity
(Entity
(Obj2
));
4727 -- No match if not same node kind (such cases are handled by
4728 -- Denotes_Same_Prefix)
4730 if Nkind
(Obj1
) /= Nkind
(Obj2
) then
4733 -- After handling valid renamings, one of the two names statically
4734 -- denoted a renaming declaration whose renamed object_name is known
4735 -- to denote the same object as the other (RM 6.4.1(6.10/3))
4737 elsif Is_Entity_Name
(Obj1
) then
4738 if Is_Entity_Name
(Obj2
) then
4739 return Entity
(Obj1
) = Entity
(Obj2
);
4744 -- Both names are selected_components, their prefixes are known to
4745 -- denote the same object, and their selector_names denote the same
4746 -- component (RM 6.4.1(6.6/3)
4748 elsif Nkind
(Obj1
) = N_Selected_Component
then
4749 return Denotes_Same_Object
(Prefix
(Obj1
), Prefix
(Obj2
))
4751 Entity
(Selector_Name
(Obj1
)) = Entity
(Selector_Name
(Obj2
));
4753 -- Both names are dereferences and the dereferenced names are known to
4754 -- denote the same object (RM 6.4.1(6.7/3))
4756 elsif Nkind
(Obj1
) = N_Explicit_Dereference
then
4757 return Denotes_Same_Object
(Prefix
(Obj1
), Prefix
(Obj2
));
4759 -- Both names are indexed_components, their prefixes are known to denote
4760 -- the same object, and each of the pairs of corresponding index values
4761 -- are either both static expressions with the same static value or both
4762 -- names that are known to denote the same object (RM 6.4.1(6.8/3))
4764 elsif Nkind
(Obj1
) = N_Indexed_Component
then
4765 if not Denotes_Same_Object
(Prefix
(Obj1
), Prefix
(Obj2
)) then
4773 Indx1
:= First
(Expressions
(Obj1
));
4774 Indx2
:= First
(Expressions
(Obj2
));
4775 while Present
(Indx1
) loop
4777 -- Indexes must denote the same static value or same object
4779 if Is_OK_Static_Expression
(Indx1
) then
4780 if not Is_OK_Static_Expression
(Indx2
) then
4783 elsif Expr_Value
(Indx1
) /= Expr_Value
(Indx2
) then
4787 elsif not Denotes_Same_Object
(Indx1
, Indx2
) then
4799 -- Both names are slices, their prefixes are known to denote the same
4800 -- object, and the two slices have statically matching index constraints
4801 -- (RM 6.4.1(6.9/3))
4803 elsif Nkind
(Obj1
) = N_Slice
4804 and then Denotes_Same_Object
(Prefix
(Obj1
), Prefix
(Obj2
))
4807 Lo1
, Lo2
, Hi1
, Hi2
: Node_Id
;
4810 Get_Index_Bounds
(Etype
(Obj1
), Lo1
, Hi1
);
4811 Get_Index_Bounds
(Etype
(Obj2
), Lo2
, Hi2
);
4813 -- Check whether bounds are statically identical. There is no
4814 -- attempt to detect partial overlap of slices.
4816 return Denotes_Same_Object
(Lo1
, Lo2
)
4818 Denotes_Same_Object
(Hi1
, Hi2
);
4821 -- In the recursion, literals appear as indexes
4823 elsif Nkind
(Obj1
) = N_Integer_Literal
4825 Nkind
(Obj2
) = N_Integer_Literal
4827 return Intval
(Obj1
) = Intval
(Obj2
);
4832 end Denotes_Same_Object
;
4834 -------------------------
4835 -- Denotes_Same_Prefix --
4836 -------------------------
4838 function Denotes_Same_Prefix
(A1
, A2
: Node_Id
) return Boolean is
4841 if Is_Entity_Name
(A1
) then
4842 if Nkind_In
(A2
, N_Selected_Component
, N_Indexed_Component
)
4843 and then not Is_Access_Type
(Etype
(A1
))
4845 return Denotes_Same_Object
(A1
, Prefix
(A2
))
4846 or else Denotes_Same_Prefix
(A1
, Prefix
(A2
));
4851 elsif Is_Entity_Name
(A2
) then
4852 return Denotes_Same_Prefix
(A1
=> A2
, A2
=> A1
);
4854 elsif Nkind_In
(A1
, N_Selected_Component
, N_Indexed_Component
, N_Slice
)
4856 Nkind_In
(A2
, N_Selected_Component
, N_Indexed_Component
, N_Slice
)
4859 Root1
, Root2
: Node_Id
;
4860 Depth1
, Depth2
: Int
:= 0;
4863 Root1
:= Prefix
(A1
);
4864 while not Is_Entity_Name
(Root1
) loop
4866 (Root1
, N_Selected_Component
, N_Indexed_Component
)
4870 Root1
:= Prefix
(Root1
);
4873 Depth1
:= Depth1
+ 1;
4876 Root2
:= Prefix
(A2
);
4877 while not Is_Entity_Name
(Root2
) loop
4878 if not Nkind_In
(Root2
, N_Selected_Component
,
4879 N_Indexed_Component
)
4883 Root2
:= Prefix
(Root2
);
4886 Depth2
:= Depth2
+ 1;
4889 -- If both have the same depth and they do not denote the same
4890 -- object, they are disjoint and no warning is needed.
4892 if Depth1
= Depth2
then
4895 elsif Depth1
> Depth2
then
4896 Root1
:= Prefix
(A1
);
4897 for J
in 1 .. Depth1
- Depth2
- 1 loop
4898 Root1
:= Prefix
(Root1
);
4901 return Denotes_Same_Object
(Root1
, A2
);
4904 Root2
:= Prefix
(A2
);
4905 for J
in 1 .. Depth2
- Depth1
- 1 loop
4906 Root2
:= Prefix
(Root2
);
4909 return Denotes_Same_Object
(A1
, Root2
);
4916 end Denotes_Same_Prefix
;
4918 ----------------------
4919 -- Denotes_Variable --
4920 ----------------------
4922 function Denotes_Variable
(N
: Node_Id
) return Boolean is
4924 return Is_Variable
(N
) and then Paren_Count
(N
) = 0;
4925 end Denotes_Variable
;
4927 -----------------------------
4928 -- Depends_On_Discriminant --
4929 -----------------------------
4931 function Depends_On_Discriminant
(N
: Node_Id
) return Boolean is
4936 Get_Index_Bounds
(N
, L
, H
);
4937 return Denotes_Discriminant
(L
) or else Denotes_Discriminant
(H
);
4938 end Depends_On_Discriminant
;
4940 -------------------------
4941 -- Designate_Same_Unit --
4942 -------------------------
4944 function Designate_Same_Unit
4946 Name2
: Node_Id
) return Boolean
4948 K1
: constant Node_Kind
:= Nkind
(Name1
);
4949 K2
: constant Node_Kind
:= Nkind
(Name2
);
4951 function Prefix_Node
(N
: Node_Id
) return Node_Id
;
4952 -- Returns the parent unit name node of a defining program unit name
4953 -- or the prefix if N is a selected component or an expanded name.
4955 function Select_Node
(N
: Node_Id
) return Node_Id
;
4956 -- Returns the defining identifier node of a defining program unit
4957 -- name or the selector node if N is a selected component or an
4964 function Prefix_Node
(N
: Node_Id
) return Node_Id
is
4966 if Nkind
(N
) = N_Defining_Program_Unit_Name
then
4977 function Select_Node
(N
: Node_Id
) return Node_Id
is
4979 if Nkind
(N
) = N_Defining_Program_Unit_Name
then
4980 return Defining_Identifier
(N
);
4982 return Selector_Name
(N
);
4986 -- Start of processing for Designate_Next_Unit
4989 if (K1
= N_Identifier
or else K1
= N_Defining_Identifier
)
4991 (K2
= N_Identifier
or else K2
= N_Defining_Identifier
)
4993 return Chars
(Name1
) = Chars
(Name2
);
4996 (K1
= N_Expanded_Name
or else
4997 K1
= N_Selected_Component
or else
4998 K1
= N_Defining_Program_Unit_Name
)
5000 (K2
= N_Expanded_Name
or else
5001 K2
= N_Selected_Component
or else
5002 K2
= N_Defining_Program_Unit_Name
)
5005 (Chars
(Select_Node
(Name1
)) = Chars
(Select_Node
(Name2
)))
5007 Designate_Same_Unit
(Prefix_Node
(Name1
), Prefix_Node
(Name2
));
5012 end Designate_Same_Unit
;
5014 ------------------------------------------
5015 -- function Dynamic_Accessibility_Level --
5016 ------------------------------------------
5018 function Dynamic_Accessibility_Level
(Expr
: Node_Id
) return Node_Id
is
5020 Loc
: constant Source_Ptr
:= Sloc
(Expr
);
5022 function Make_Level_Literal
(Level
: Uint
) return Node_Id
;
5023 -- Construct an integer literal representing an accessibility level
5024 -- with its type set to Natural.
5026 ------------------------
5027 -- Make_Level_Literal --
5028 ------------------------
5030 function Make_Level_Literal
(Level
: Uint
) return Node_Id
is
5031 Result
: constant Node_Id
:= Make_Integer_Literal
(Loc
, Level
);
5033 Set_Etype
(Result
, Standard_Natural
);
5035 end Make_Level_Literal
;
5037 -- Start of processing for Dynamic_Accessibility_Level
5040 if Is_Entity_Name
(Expr
) then
5043 if Present
(Renamed_Object
(E
)) then
5044 return Dynamic_Accessibility_Level
(Renamed_Object
(E
));
5047 if Is_Formal
(E
) or else Ekind_In
(E
, E_Variable
, E_Constant
) then
5048 if Present
(Extra_Accessibility
(E
)) then
5049 return New_Occurrence_Of
(Extra_Accessibility
(E
), Loc
);
5054 -- Unimplemented: Ptr.all'Access, where Ptr has Extra_Accessibility ???
5056 case Nkind
(Expr
) is
5058 -- For access discriminant, the level of the enclosing object
5060 when N_Selected_Component
=>
5061 if Ekind
(Entity
(Selector_Name
(Expr
))) = E_Discriminant
5062 and then Ekind
(Etype
(Entity
(Selector_Name
(Expr
)))) =
5063 E_Anonymous_Access_Type
5065 return Make_Level_Literal
(Object_Access_Level
(Expr
));
5068 when N_Attribute_Reference
=>
5069 case Get_Attribute_Id
(Attribute_Name
(Expr
)) is
5071 -- For X'Access, the level of the prefix X
5073 when Attribute_Access
=>
5074 return Make_Level_Literal
5075 (Object_Access_Level
(Prefix
(Expr
)));
5077 -- Treat the unchecked attributes as library-level
5079 when Attribute_Unchecked_Access |
5080 Attribute_Unrestricted_Access
=>
5081 return Make_Level_Literal
(Scope_Depth
(Standard_Standard
));
5083 -- No other access-valued attributes
5086 raise Program_Error
;
5091 -- Unimplemented: depends on context. As an actual parameter where
5092 -- formal type is anonymous, use
5093 -- Scope_Depth (Current_Scope) + 1.
5094 -- For other cases, see 3.10.2(14/3) and following. ???
5098 when N_Type_Conversion
=>
5099 if not Is_Local_Anonymous_Access
(Etype
(Expr
)) then
5101 -- Handle type conversions introduced for a rename of an
5102 -- Ada 2012 stand-alone object of an anonymous access type.
5104 return Dynamic_Accessibility_Level
(Expression
(Expr
));
5111 return Make_Level_Literal
(Type_Access_Level
(Etype
(Expr
)));
5112 end Dynamic_Accessibility_Level
;
5114 -----------------------------------
5115 -- Effective_Extra_Accessibility --
5116 -----------------------------------
5118 function Effective_Extra_Accessibility
(Id
: Entity_Id
) return Entity_Id
is
5120 if Present
(Renamed_Object
(Id
))
5121 and then Is_Entity_Name
(Renamed_Object
(Id
))
5123 return Effective_Extra_Accessibility
(Entity
(Renamed_Object
(Id
)));
5125 return Extra_Accessibility
(Id
);
5127 end Effective_Extra_Accessibility
;
5129 -----------------------------
5130 -- Effective_Reads_Enabled --
5131 -----------------------------
5133 function Effective_Reads_Enabled
(Id
: Entity_Id
) return Boolean is
5135 return Has_Enabled_Property
(Id
, Name_Effective_Reads
);
5136 end Effective_Reads_Enabled
;
5138 ------------------------------
5139 -- Effective_Writes_Enabled --
5140 ------------------------------
5142 function Effective_Writes_Enabled
(Id
: Entity_Id
) return Boolean is
5144 return Has_Enabled_Property
(Id
, Name_Effective_Writes
);
5145 end Effective_Writes_Enabled
;
5147 ------------------------------
5148 -- Enclosing_Comp_Unit_Node --
5149 ------------------------------
5151 function Enclosing_Comp_Unit_Node
(N
: Node_Id
) return Node_Id
is
5152 Current_Node
: Node_Id
;
5156 while Present
(Current_Node
)
5157 and then Nkind
(Current_Node
) /= N_Compilation_Unit
5159 Current_Node
:= Parent
(Current_Node
);
5162 if Nkind
(Current_Node
) /= N_Compilation_Unit
then
5165 return Current_Node
;
5167 end Enclosing_Comp_Unit_Node
;
5169 --------------------------
5170 -- Enclosing_CPP_Parent --
5171 --------------------------
5173 function Enclosing_CPP_Parent
(Typ
: Entity_Id
) return Entity_Id
is
5174 Parent_Typ
: Entity_Id
:= Typ
;
5177 while not Is_CPP_Class
(Parent_Typ
)
5178 and then Etype
(Parent_Typ
) /= Parent_Typ
5180 Parent_Typ
:= Etype
(Parent_Typ
);
5182 if Is_Private_Type
(Parent_Typ
) then
5183 Parent_Typ
:= Full_View
(Base_Type
(Parent_Typ
));
5187 pragma Assert
(Is_CPP_Class
(Parent_Typ
));
5189 end Enclosing_CPP_Parent
;
5191 ----------------------------
5192 -- Enclosing_Generic_Body --
5193 ----------------------------
5195 function Enclosing_Generic_Body
5196 (N
: Node_Id
) return Node_Id
5204 while Present
(P
) loop
5205 if Nkind
(P
) = N_Package_Body
5206 or else Nkind
(P
) = N_Subprogram_Body
5208 Spec
:= Corresponding_Spec
(P
);
5210 if Present
(Spec
) then
5211 Decl
:= Unit_Declaration_Node
(Spec
);
5213 if Nkind
(Decl
) = N_Generic_Package_Declaration
5214 or else Nkind
(Decl
) = N_Generic_Subprogram_Declaration
5225 end Enclosing_Generic_Body
;
5227 ----------------------------
5228 -- Enclosing_Generic_Unit --
5229 ----------------------------
5231 function Enclosing_Generic_Unit
5232 (N
: Node_Id
) return Node_Id
5240 while Present
(P
) loop
5241 if Nkind
(P
) = N_Generic_Package_Declaration
5242 or else Nkind
(P
) = N_Generic_Subprogram_Declaration
5246 elsif Nkind
(P
) = N_Package_Body
5247 or else Nkind
(P
) = N_Subprogram_Body
5249 Spec
:= Corresponding_Spec
(P
);
5251 if Present
(Spec
) then
5252 Decl
:= Unit_Declaration_Node
(Spec
);
5254 if Nkind
(Decl
) = N_Generic_Package_Declaration
5255 or else Nkind
(Decl
) = N_Generic_Subprogram_Declaration
5266 end Enclosing_Generic_Unit
;
5268 -------------------------------
5269 -- Enclosing_Lib_Unit_Entity --
5270 -------------------------------
5272 function Enclosing_Lib_Unit_Entity
5273 (E
: Entity_Id
:= Current_Scope
) return Entity_Id
5275 Unit_Entity
: Entity_Id
;
5278 -- Look for enclosing library unit entity by following scope links.
5279 -- Equivalent to, but faster than indexing through the scope stack.
5282 while (Present
(Scope
(Unit_Entity
))
5283 and then Scope
(Unit_Entity
) /= Standard_Standard
)
5284 and not Is_Child_Unit
(Unit_Entity
)
5286 Unit_Entity
:= Scope
(Unit_Entity
);
5290 end Enclosing_Lib_Unit_Entity
;
5292 -----------------------
5293 -- Enclosing_Package --
5294 -----------------------
5296 function Enclosing_Package
(E
: Entity_Id
) return Entity_Id
is
5297 Dynamic_Scope
: constant Entity_Id
:= Enclosing_Dynamic_Scope
(E
);
5300 if Dynamic_Scope
= Standard_Standard
then
5301 return Standard_Standard
;
5303 elsif Dynamic_Scope
= Empty
then
5306 elsif Ekind_In
(Dynamic_Scope
, E_Package
, E_Package_Body
,
5309 return Dynamic_Scope
;
5312 return Enclosing_Package
(Dynamic_Scope
);
5314 end Enclosing_Package
;
5316 --------------------------
5317 -- Enclosing_Subprogram --
5318 --------------------------
5320 function Enclosing_Subprogram
(E
: Entity_Id
) return Entity_Id
is
5321 Dynamic_Scope
: constant Entity_Id
:= Enclosing_Dynamic_Scope
(E
);
5324 if Dynamic_Scope
= Standard_Standard
then
5327 elsif Dynamic_Scope
= Empty
then
5330 elsif Ekind
(Dynamic_Scope
) = E_Subprogram_Body
then
5331 return Corresponding_Spec
(Parent
(Parent
(Dynamic_Scope
)));
5333 elsif Ekind
(Dynamic_Scope
) = E_Block
5334 or else Ekind
(Dynamic_Scope
) = E_Return_Statement
5336 return Enclosing_Subprogram
(Dynamic_Scope
);
5338 elsif Ekind
(Dynamic_Scope
) = E_Task_Type
then
5339 return Get_Task_Body_Procedure
(Dynamic_Scope
);
5341 elsif Ekind
(Dynamic_Scope
) = E_Limited_Private_Type
5342 and then Present
(Full_View
(Dynamic_Scope
))
5343 and then Ekind
(Full_View
(Dynamic_Scope
)) = E_Task_Type
5345 return Get_Task_Body_Procedure
(Full_View
(Dynamic_Scope
));
5347 -- No body is generated if the protected operation is eliminated
5349 elsif Convention
(Dynamic_Scope
) = Convention_Protected
5350 and then not Is_Eliminated
(Dynamic_Scope
)
5351 and then Present
(Protected_Body_Subprogram
(Dynamic_Scope
))
5353 return Protected_Body_Subprogram
(Dynamic_Scope
);
5356 return Dynamic_Scope
;
5358 end Enclosing_Subprogram
;
5360 ------------------------
5361 -- Ensure_Freeze_Node --
5362 ------------------------
5364 procedure Ensure_Freeze_Node
(E
: Entity_Id
) is
5367 if No
(Freeze_Node
(E
)) then
5368 FN
:= Make_Freeze_Entity
(Sloc
(E
));
5369 Set_Has_Delayed_Freeze
(E
);
5370 Set_Freeze_Node
(E
, FN
);
5371 Set_Access_Types_To_Process
(FN
, No_Elist
);
5372 Set_TSS_Elist
(FN
, No_Elist
);
5375 end Ensure_Freeze_Node
;
5381 procedure Enter_Name
(Def_Id
: Entity_Id
) is
5382 C
: constant Entity_Id
:= Current_Entity
(Def_Id
);
5383 E
: constant Entity_Id
:= Current_Entity_In_Scope
(Def_Id
);
5384 S
: constant Entity_Id
:= Current_Scope
;
5387 Generate_Definition
(Def_Id
);
5389 -- Add new name to current scope declarations. Check for duplicate
5390 -- declaration, which may or may not be a genuine error.
5394 -- Case of previous entity entered because of a missing declaration
5395 -- or else a bad subtype indication. Best is to use the new entity,
5396 -- and make the previous one invisible.
5398 if Etype
(E
) = Any_Type
then
5399 Set_Is_Immediately_Visible
(E
, False);
5401 -- Case of renaming declaration constructed for package instances.
5402 -- if there is an explicit declaration with the same identifier,
5403 -- the renaming is not immediately visible any longer, but remains
5404 -- visible through selected component notation.
5406 elsif Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
5407 and then not Comes_From_Source
(E
)
5409 Set_Is_Immediately_Visible
(E
, False);
5411 -- The new entity may be the package renaming, which has the same
5412 -- same name as a generic formal which has been seen already.
5414 elsif Nkind
(Parent
(Def_Id
)) = N_Package_Renaming_Declaration
5415 and then not Comes_From_Source
(Def_Id
)
5417 Set_Is_Immediately_Visible
(E
, False);
5419 -- For a fat pointer corresponding to a remote access to subprogram,
5420 -- we use the same identifier as the RAS type, so that the proper
5421 -- name appears in the stub. This type is only retrieved through
5422 -- the RAS type and never by visibility, and is not added to the
5423 -- visibility list (see below).
5425 elsif Nkind
(Parent
(Def_Id
)) = N_Full_Type_Declaration
5426 and then Ekind
(Def_Id
) = E_Record_Type
5427 and then Present
(Corresponding_Remote_Type
(Def_Id
))
5431 -- Case of an implicit operation or derived literal. The new entity
5432 -- hides the implicit one, which is removed from all visibility,
5433 -- i.e. the entity list of its scope, and homonym chain of its name.
5435 elsif (Is_Overloadable
(E
) and then Is_Inherited_Operation
(E
))
5436 or else Is_Internal
(E
)
5440 Prev_Vis
: Entity_Id
;
5441 Decl
: constant Node_Id
:= Parent
(E
);
5444 -- If E is an implicit declaration, it cannot be the first
5445 -- entity in the scope.
5447 Prev
:= First_Entity
(Current_Scope
);
5448 while Present
(Prev
) and then Next_Entity
(Prev
) /= E
loop
5454 -- If E is not on the entity chain of the current scope,
5455 -- it is an implicit declaration in the generic formal
5456 -- part of a generic subprogram. When analyzing the body,
5457 -- the generic formals are visible but not on the entity
5458 -- chain of the subprogram. The new entity will become
5459 -- the visible one in the body.
5462 (Nkind
(Parent
(Decl
)) = N_Generic_Subprogram_Declaration
);
5466 Set_Next_Entity
(Prev
, Next_Entity
(E
));
5468 if No
(Next_Entity
(Prev
)) then
5469 Set_Last_Entity
(Current_Scope
, Prev
);
5472 if E
= Current_Entity
(E
) then
5476 Prev_Vis
:= Current_Entity
(E
);
5477 while Homonym
(Prev_Vis
) /= E
loop
5478 Prev_Vis
:= Homonym
(Prev_Vis
);
5482 if Present
(Prev_Vis
) then
5484 -- Skip E in the visibility chain
5486 Set_Homonym
(Prev_Vis
, Homonym
(E
));
5489 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
5494 -- This section of code could use a comment ???
5496 elsif Present
(Etype
(E
))
5497 and then Is_Concurrent_Type
(Etype
(E
))
5502 -- If the homograph is a protected component renaming, it should not
5503 -- be hiding the current entity. Such renamings are treated as weak
5506 elsif Is_Prival
(E
) then
5507 Set_Is_Immediately_Visible
(E
, False);
5509 -- In this case the current entity is a protected component renaming.
5510 -- Perform minimal decoration by setting the scope and return since
5511 -- the prival should not be hiding other visible entities.
5513 elsif Is_Prival
(Def_Id
) then
5514 Set_Scope
(Def_Id
, Current_Scope
);
5517 -- Analogous to privals, the discriminal generated for an entry index
5518 -- parameter acts as a weak declaration. Perform minimal decoration
5519 -- to avoid bogus errors.
5521 elsif Is_Discriminal
(Def_Id
)
5522 and then Ekind
(Discriminal_Link
(Def_Id
)) = E_Entry_Index_Parameter
5524 Set_Scope
(Def_Id
, Current_Scope
);
5527 -- In the body or private part of an instance, a type extension may
5528 -- introduce a component with the same name as that of an actual. The
5529 -- legality rule is not enforced, but the semantics of the full type
5530 -- with two components of same name are not clear at this point???
5532 elsif In_Instance_Not_Visible
then
5535 -- When compiling a package body, some child units may have become
5536 -- visible. They cannot conflict with local entities that hide them.
5538 elsif Is_Child_Unit
(E
)
5539 and then In_Open_Scopes
(Scope
(E
))
5540 and then not Is_Immediately_Visible
(E
)
5544 -- Conversely, with front-end inlining we may compile the parent body
5545 -- first, and a child unit subsequently. The context is now the
5546 -- parent spec, and body entities are not visible.
5548 elsif Is_Child_Unit
(Def_Id
)
5549 and then Is_Package_Body_Entity
(E
)
5550 and then not In_Package_Body
(Current_Scope
)
5554 -- Case of genuine duplicate declaration
5557 Error_Msg_Sloc
:= Sloc
(E
);
5559 -- If the previous declaration is an incomplete type declaration
5560 -- this may be an attempt to complete it with a private type. The
5561 -- following avoids confusing cascaded errors.
5563 if Nkind
(Parent
(E
)) = N_Incomplete_Type_Declaration
5564 and then Nkind
(Parent
(Def_Id
)) = N_Private_Type_Declaration
5567 ("incomplete type cannot be completed with a private " &
5568 "declaration", Parent
(Def_Id
));
5569 Set_Is_Immediately_Visible
(E
, False);
5570 Set_Full_View
(E
, Def_Id
);
5572 -- An inherited component of a record conflicts with a new
5573 -- discriminant. The discriminant is inserted first in the scope,
5574 -- but the error should be posted on it, not on the component.
5576 elsif Ekind
(E
) = E_Discriminant
5577 and then Present
(Scope
(Def_Id
))
5578 and then Scope
(Def_Id
) /= Current_Scope
5580 Error_Msg_Sloc
:= Sloc
(Def_Id
);
5581 Error_Msg_N
("& conflicts with declaration#", E
);
5584 -- If the name of the unit appears in its own context clause, a
5585 -- dummy package with the name has already been created, and the
5586 -- error emitted. Try to continue quietly.
5588 elsif Error_Posted
(E
)
5589 and then Sloc
(E
) = No_Location
5590 and then Nkind
(Parent
(E
)) = N_Package_Specification
5591 and then Current_Scope
= Standard_Standard
5593 Set_Scope
(Def_Id
, Current_Scope
);
5597 Error_Msg_N
("& conflicts with declaration#", Def_Id
);
5599 -- Avoid cascaded messages with duplicate components in
5602 if Ekind_In
(E
, E_Component
, E_Discriminant
) then
5607 if Nkind
(Parent
(Parent
(Def_Id
))) =
5608 N_Generic_Subprogram_Declaration
5610 Defining_Entity
(Specification
(Parent
(Parent
(Def_Id
))))
5612 Error_Msg_N
("\generic units cannot be overloaded", Def_Id
);
5615 -- If entity is in standard, then we are in trouble, because it
5616 -- means that we have a library package with a duplicated name.
5617 -- That's hard to recover from, so abort.
5619 if S
= Standard_Standard
then
5620 raise Unrecoverable_Error
;
5622 -- Otherwise we continue with the declaration. Having two
5623 -- identical declarations should not cause us too much trouble.
5631 -- If we fall through, declaration is OK, at least OK enough to continue
5633 -- If Def_Id is a discriminant or a record component we are in the midst
5634 -- of inheriting components in a derived record definition. Preserve
5635 -- their Ekind and Etype.
5637 if Ekind_In
(Def_Id
, E_Discriminant
, E_Component
) then
5640 -- If a type is already set, leave it alone (happens when a type
5641 -- declaration is reanalyzed following a call to the optimizer).
5643 elsif Present
(Etype
(Def_Id
)) then
5646 -- Otherwise, the kind E_Void insures that premature uses of the entity
5647 -- will be detected. Any_Type insures that no cascaded errors will occur
5650 Set_Ekind
(Def_Id
, E_Void
);
5651 Set_Etype
(Def_Id
, Any_Type
);
5654 -- Inherited discriminants and components in derived record types are
5655 -- immediately visible. Itypes are not.
5657 -- Unless the Itype is for a record type with a corresponding remote
5658 -- type (what is that about, it was not commented ???)
5660 if Ekind_In
(Def_Id
, E_Discriminant
, E_Component
)
5662 ((not Is_Record_Type
(Def_Id
)
5663 or else No
(Corresponding_Remote_Type
(Def_Id
)))
5664 and then not Is_Itype
(Def_Id
))
5666 Set_Is_Immediately_Visible
(Def_Id
);
5667 Set_Current_Entity
(Def_Id
);
5670 Set_Homonym
(Def_Id
, C
);
5671 Append_Entity
(Def_Id
, S
);
5672 Set_Public_Status
(Def_Id
);
5674 -- Declaring a homonym is not allowed in SPARK ...
5676 if Present
(C
) and then Restriction_Check_Required
(SPARK_05
) then
5678 Enclosing_Subp
: constant Node_Id
:= Enclosing_Subprogram
(Def_Id
);
5679 Enclosing_Pack
: constant Node_Id
:= Enclosing_Package
(Def_Id
);
5680 Other_Scope
: constant Node_Id
:= Enclosing_Dynamic_Scope
(C
);
5683 -- ... unless the new declaration is in a subprogram, and the
5684 -- visible declaration is a variable declaration or a parameter
5685 -- specification outside that subprogram.
5687 if Present
(Enclosing_Subp
)
5688 and then Nkind_In
(Parent
(C
), N_Object_Declaration
,
5689 N_Parameter_Specification
)
5690 and then not Scope_Within_Or_Same
(Other_Scope
, Enclosing_Subp
)
5694 -- ... or the new declaration is in a package, and the visible
5695 -- declaration occurs outside that package.
5697 elsif Present
(Enclosing_Pack
)
5698 and then not Scope_Within_Or_Same
(Other_Scope
, Enclosing_Pack
)
5702 -- ... or the new declaration is a component declaration in a
5703 -- record type definition.
5705 elsif Nkind
(Parent
(Def_Id
)) = N_Component_Declaration
then
5708 -- Don't issue error for non-source entities
5710 elsif Comes_From_Source
(Def_Id
)
5711 and then Comes_From_Source
(C
)
5713 Error_Msg_Sloc
:= Sloc
(C
);
5714 Check_SPARK_05_Restriction
5715 ("redeclaration of identifier &#", Def_Id
);
5720 -- Warn if new entity hides an old one
5722 if Warn_On_Hiding
and then Present
(C
)
5724 -- Don't warn for record components since they always have a well
5725 -- defined scope which does not confuse other uses. Note that in
5726 -- some cases, Ekind has not been set yet.
5728 and then Ekind
(C
) /= E_Component
5729 and then Ekind
(C
) /= E_Discriminant
5730 and then Nkind
(Parent
(C
)) /= N_Component_Declaration
5731 and then Ekind
(Def_Id
) /= E_Component
5732 and then Ekind
(Def_Id
) /= E_Discriminant
5733 and then Nkind
(Parent
(Def_Id
)) /= N_Component_Declaration
5735 -- Don't warn for one character variables. It is too common to use
5736 -- such variables as locals and will just cause too many false hits.
5738 and then Length_Of_Name
(Chars
(C
)) /= 1
5740 -- Don't warn for non-source entities
5742 and then Comes_From_Source
(C
)
5743 and then Comes_From_Source
(Def_Id
)
5745 -- Don't warn unless entity in question is in extended main source
5747 and then In_Extended_Main_Source_Unit
(Def_Id
)
5749 -- Finally, the hidden entity must be either immediately visible or
5750 -- use visible (i.e. from a used package).
5753 (Is_Immediately_Visible
(C
)
5755 Is_Potentially_Use_Visible
(C
))
5757 Error_Msg_Sloc
:= Sloc
(C
);
5758 Error_Msg_N
("declaration hides &#?h?", Def_Id
);
5766 function Entity_Of
(N
: Node_Id
) return Entity_Id
is
5772 if Is_Entity_Name
(N
) then
5775 -- Follow a possible chain of renamings to reach the root renamed
5778 while Present
(Id
) and then Present
(Renamed_Object
(Id
)) loop
5779 if Is_Entity_Name
(Renamed_Object
(Id
)) then
5780 Id
:= Entity
(Renamed_Object
(Id
));
5791 --------------------------
5792 -- Explain_Limited_Type --
5793 --------------------------
5795 procedure Explain_Limited_Type
(T
: Entity_Id
; N
: Node_Id
) is
5799 -- For array, component type must be limited
5801 if Is_Array_Type
(T
) then
5802 Error_Msg_Node_2
:= T
;
5804 ("\component type& of type& is limited", N
, Component_Type
(T
));
5805 Explain_Limited_Type
(Component_Type
(T
), N
);
5807 elsif Is_Record_Type
(T
) then
5809 -- No need for extra messages if explicit limited record
5811 if Is_Limited_Record
(Base_Type
(T
)) then
5815 -- Otherwise find a limited component. Check only components that
5816 -- come from source, or inherited components that appear in the
5817 -- source of the ancestor.
5819 C
:= First_Component
(T
);
5820 while Present
(C
) loop
5821 if Is_Limited_Type
(Etype
(C
))
5823 (Comes_From_Source
(C
)
5825 (Present
(Original_Record_Component
(C
))
5827 Comes_From_Source
(Original_Record_Component
(C
))))
5829 Error_Msg_Node_2
:= T
;
5830 Error_Msg_NE
("\component& of type& has limited type", N
, C
);
5831 Explain_Limited_Type
(Etype
(C
), N
);
5838 -- The type may be declared explicitly limited, even if no component
5839 -- of it is limited, in which case we fall out of the loop.
5842 end Explain_Limited_Type
;
5844 -------------------------------
5845 -- Extensions_Visible_Status --
5846 -------------------------------
5848 function Extensions_Visible_Status
5849 (Id
: Entity_Id
) return Extensions_Visible_Mode
5857 if SPARK_Mode
= On
then
5859 -- When a formal parameter is subject to Extensions_Visible, the
5860 -- pragma is stored in the contract of related subprogram.
5862 if Is_Formal
(Id
) then
5865 elsif Is_Subprogram_Or_Generic_Subprogram
(Id
) then
5868 -- No other construct carries this pragma
5871 return Extensions_Visible_None
;
5874 Prag
:= Get_Pragma
(Subp
, Pragma_Extensions_Visible
);
5876 -- Extract the value from the Boolean expression (if any)
5878 if Present
(Prag
) then
5879 Arg1
:= First
(Pragma_Argument_Associations
(Prag
));
5881 -- The pragma appears with an argument
5883 if Present
(Arg1
) then
5884 Expr
:= Get_Pragma_Arg
(Arg1
);
5886 -- Guarg against cascading errors when the argument of pragma
5887 -- Extensions_Visible is not a valid static Boolean expression.
5889 if Error_Posted
(Expr
) then
5890 return Extensions_Visible_None
;
5892 elsif Is_True
(Expr_Value
(Expr
)) then
5893 return Extensions_Visible_True
;
5896 return Extensions_Visible_False
;
5899 -- Otherwise the pragma defaults to True
5902 return Extensions_Visible_True
;
5905 -- Otherwise pragma Expresions_Visible is not inherited or directly
5906 -- specified, its value defaults to "False".
5909 return Extensions_Visible_False
;
5912 -- When SPARK_Mode is disabled, all semantic checks related to pragma
5913 -- Extensions_Visible are disabled as well. Instead of saturating the
5914 -- code with "if SPARK_Mode /= Off then" checks, the predicate returns
5918 return Extensions_Visible_None
;
5920 end Extensions_Visible_Status
;
5926 procedure Find_Actual
5928 Formal
: out Entity_Id
;
5931 Parnt
: constant Node_Id
:= Parent
(N
);
5935 if Nkind_In
(Parnt
, N_Indexed_Component
, N_Selected_Component
)
5936 and then N
= Prefix
(Parnt
)
5938 Find_Actual
(Parnt
, Formal
, Call
);
5941 elsif Nkind
(Parnt
) = N_Parameter_Association
5942 and then N
= Explicit_Actual_Parameter
(Parnt
)
5944 Call
:= Parent
(Parnt
);
5946 elsif Nkind
(Parnt
) in N_Subprogram_Call
then
5955 -- If we have a call to a subprogram look for the parameter. Note that
5956 -- we exclude overloaded calls, since we don't know enough to be sure
5957 -- of giving the right answer in this case.
5959 if Nkind_In
(Call
, N_Function_Call
, N_Procedure_Call_Statement
)
5960 and then Is_Entity_Name
(Name
(Call
))
5961 and then Present
(Entity
(Name
(Call
)))
5962 and then Is_Overloadable
(Entity
(Name
(Call
)))
5963 and then not Is_Overloaded
(Name
(Call
))
5965 -- Fall here if we are definitely a parameter
5967 Actual
:= First_Actual
(Call
);
5968 Formal
:= First_Formal
(Entity
(Name
(Call
)));
5969 while Present
(Formal
) and then Present
(Actual
) loop
5973 -- An actual that is the prefix in a prefixed call may have
5974 -- been rewritten in the call, after the deferred reference
5975 -- was collected. Check if sloc and kinds and names match.
5977 elsif Sloc
(Actual
) = Sloc
(N
)
5978 and then Nkind
(Actual
) = N_Identifier
5979 and then Nkind
(Actual
) = Nkind
(N
)
5980 and then Chars
(Actual
) = Chars
(N
)
5985 Actual
:= Next_Actual
(Actual
);
5986 Formal
:= Next_Formal
(Formal
);
5991 -- Fall through here if we did not find matching actual
5997 ---------------------------
5998 -- Find_Body_Discriminal --
5999 ---------------------------
6001 function Find_Body_Discriminal
6002 (Spec_Discriminant
: Entity_Id
) return Entity_Id
6008 -- If expansion is suppressed, then the scope can be the concurrent type
6009 -- itself rather than a corresponding concurrent record type.
6011 if Is_Concurrent_Type
(Scope
(Spec_Discriminant
)) then
6012 Tsk
:= Scope
(Spec_Discriminant
);
6015 pragma Assert
(Is_Concurrent_Record_Type
(Scope
(Spec_Discriminant
)));
6017 Tsk
:= Corresponding_Concurrent_Type
(Scope
(Spec_Discriminant
));
6020 -- Find discriminant of original concurrent type, and use its current
6021 -- discriminal, which is the renaming within the task/protected body.
6023 Disc
:= First_Discriminant
(Tsk
);
6024 while Present
(Disc
) loop
6025 if Chars
(Disc
) = Chars
(Spec_Discriminant
) then
6026 return Discriminal
(Disc
);
6029 Next_Discriminant
(Disc
);
6032 -- That loop should always succeed in finding a matching entry and
6033 -- returning. Fatal error if not.
6035 raise Program_Error
;
6036 end Find_Body_Discriminal
;
6038 -------------------------------------
6039 -- Find_Corresponding_Discriminant --
6040 -------------------------------------
6042 function Find_Corresponding_Discriminant
6044 Typ
: Entity_Id
) return Entity_Id
6046 Par_Disc
: Entity_Id
;
6047 Old_Disc
: Entity_Id
;
6048 New_Disc
: Entity_Id
;
6051 Par_Disc
:= Original_Record_Component
(Original_Discriminant
(Id
));
6053 -- The original type may currently be private, and the discriminant
6054 -- only appear on its full view.
6056 if Is_Private_Type
(Scope
(Par_Disc
))
6057 and then not Has_Discriminants
(Scope
(Par_Disc
))
6058 and then Present
(Full_View
(Scope
(Par_Disc
)))
6060 Old_Disc
:= First_Discriminant
(Full_View
(Scope
(Par_Disc
)));
6062 Old_Disc
:= First_Discriminant
(Scope
(Par_Disc
));
6065 if Is_Class_Wide_Type
(Typ
) then
6066 New_Disc
:= First_Discriminant
(Root_Type
(Typ
));
6068 New_Disc
:= First_Discriminant
(Typ
);
6071 while Present
(Old_Disc
) and then Present
(New_Disc
) loop
6072 if Old_Disc
= Par_Disc
then
6076 Next_Discriminant
(Old_Disc
);
6077 Next_Discriminant
(New_Disc
);
6080 -- Should always find it
6082 raise Program_Error
;
6083 end Find_Corresponding_Discriminant
;
6085 ----------------------------------
6086 -- Find_Enclosing_Iterator_Loop --
6087 ----------------------------------
6089 function Find_Enclosing_Iterator_Loop
(Id
: Entity_Id
) return Entity_Id
is
6094 -- Traverse the scope chain looking for an iterator loop. Such loops are
6095 -- usually transformed into blocks, hence the use of Original_Node.
6098 while Present
(S
) and then S
/= Standard_Standard
loop
6099 if Ekind
(S
) = E_Loop
6100 and then Nkind
(Parent
(S
)) = N_Implicit_Label_Declaration
6102 Constr
:= Original_Node
(Label_Construct
(Parent
(S
)));
6104 if Nkind
(Constr
) = N_Loop_Statement
6105 and then Present
(Iteration_Scheme
(Constr
))
6106 and then Nkind
(Iterator_Specification
6107 (Iteration_Scheme
(Constr
))) =
6108 N_Iterator_Specification
6118 end Find_Enclosing_Iterator_Loop
;
6120 ------------------------------------
6121 -- Find_Loop_In_Conditional_Block --
6122 ------------------------------------
6124 function Find_Loop_In_Conditional_Block
(N
: Node_Id
) return Node_Id
is
6130 if Nkind
(Stmt
) = N_If_Statement
then
6131 Stmt
:= First
(Then_Statements
(Stmt
));
6134 pragma Assert
(Nkind
(Stmt
) = N_Block_Statement
);
6136 -- Inspect the statements of the conditional block. In general the loop
6137 -- should be the first statement in the statement sequence of the block,
6138 -- but the finalization machinery may have introduced extra object
6141 Stmt
:= First
(Statements
(Handled_Statement_Sequence
(Stmt
)));
6142 while Present
(Stmt
) loop
6143 if Nkind
(Stmt
) = N_Loop_Statement
then
6150 -- The expansion of attribute 'Loop_Entry produced a malformed block
6152 raise Program_Error
;
6153 end Find_Loop_In_Conditional_Block
;
6155 --------------------------
6156 -- Find_Overlaid_Entity --
6157 --------------------------
6159 procedure Find_Overlaid_Entity
6161 Ent
: out Entity_Id
;
6167 -- We are looking for one of the two following forms:
6169 -- for X'Address use Y'Address
6173 -- Const : constant Address := expr;
6175 -- for X'Address use Const;
6177 -- In the second case, the expr is either Y'Address, or recursively a
6178 -- constant that eventually references Y'Address.
6183 if Nkind
(N
) = N_Attribute_Definition_Clause
6184 and then Chars
(N
) = Name_Address
6186 Expr
:= Expression
(N
);
6188 -- This loop checks the form of the expression for Y'Address,
6189 -- using recursion to deal with intermediate constants.
6192 -- Check for Y'Address
6194 if Nkind
(Expr
) = N_Attribute_Reference
6195 and then Attribute_Name
(Expr
) = Name_Address
6197 Expr
:= Prefix
(Expr
);
6200 -- Check for Const where Const is a constant entity
6202 elsif Is_Entity_Name
(Expr
)
6203 and then Ekind
(Entity
(Expr
)) = E_Constant
6205 Expr
:= Constant_Value
(Entity
(Expr
));
6207 -- Anything else does not need checking
6214 -- This loop checks the form of the prefix for an entity, using
6215 -- recursion to deal with intermediate components.
6218 -- Check for Y where Y is an entity
6220 if Is_Entity_Name
(Expr
) then
6221 Ent
:= Entity
(Expr
);
6224 -- Check for components
6227 Nkind_In
(Expr
, N_Selected_Component
, N_Indexed_Component
)
6229 Expr
:= Prefix
(Expr
);
6232 -- Anything else does not need checking
6239 end Find_Overlaid_Entity
;
6241 -------------------------
6242 -- Find_Parameter_Type --
6243 -------------------------
6245 function Find_Parameter_Type
(Param
: Node_Id
) return Entity_Id
is
6247 if Nkind
(Param
) /= N_Parameter_Specification
then
6250 -- For an access parameter, obtain the type from the formal entity
6251 -- itself, because access to subprogram nodes do not carry a type.
6252 -- Shouldn't we always use the formal entity ???
6254 elsif Nkind
(Parameter_Type
(Param
)) = N_Access_Definition
then
6255 return Etype
(Defining_Identifier
(Param
));
6258 return Etype
(Parameter_Type
(Param
));
6260 end Find_Parameter_Type
;
6262 -----------------------------------
6263 -- Find_Placement_In_State_Space --
6264 -----------------------------------
6266 procedure Find_Placement_In_State_Space
6267 (Item_Id
: Entity_Id
;
6268 Placement
: out State_Space_Kind
;
6269 Pack_Id
: out Entity_Id
)
6271 Context
: Entity_Id
;
6274 -- Assume that the item does not appear in the state space of a package
6276 Placement
:= Not_In_Package
;
6279 -- Climb the scope stack and examine the enclosing context
6281 Context
:= Scope
(Item_Id
);
6282 while Present
(Context
) and then Context
/= Standard_Standard
loop
6283 if Ekind
(Context
) = E_Package
then
6286 -- A package body is a cut off point for the traversal as the item
6287 -- cannot be visible to the outside from this point on. Note that
6288 -- this test must be done first as a body is also classified as a
6291 if In_Package_Body
(Context
) then
6292 Placement
:= Body_State_Space
;
6295 -- The private part of a package is a cut off point for the
6296 -- traversal as the item cannot be visible to the outside from
6299 elsif In_Private_Part
(Context
) then
6300 Placement
:= Private_State_Space
;
6303 -- When the item appears in the visible state space of a package,
6304 -- continue to climb the scope stack as this may not be the final
6308 Placement
:= Visible_State_Space
;
6310 -- The visible state space of a child unit acts as the proper
6311 -- placement of an item.
6313 if Is_Child_Unit
(Context
) then
6318 -- The item or its enclosing package appear in a construct that has
6322 Placement
:= Not_In_Package
;
6326 Context
:= Scope
(Context
);
6328 end Find_Placement_In_State_Space
;
6330 ------------------------
6331 -- Find_Specific_Type --
6332 ------------------------
6334 function Find_Specific_Type
(CW
: Entity_Id
) return Entity_Id
is
6335 Typ
: Entity_Id
:= Root_Type
(CW
);
6338 if Ekind
(Typ
) = E_Incomplete_Type
then
6339 if From_Limited_With
(Typ
) then
6340 Typ
:= Non_Limited_View
(Typ
);
6342 Typ
:= Full_View
(Typ
);
6346 if Is_Private_Type
(Typ
)
6347 and then not Is_Tagged_Type
(Typ
)
6348 and then Present
(Full_View
(Typ
))
6350 return Full_View
(Typ
);
6354 end Find_Specific_Type
;
6356 -----------------------------
6357 -- Find_Static_Alternative --
6358 -----------------------------
6360 function Find_Static_Alternative
(N
: Node_Id
) return Node_Id
is
6361 Expr
: constant Node_Id
:= Expression
(N
);
6362 Val
: constant Uint
:= Expr_Value
(Expr
);
6367 Alt
:= First
(Alternatives
(N
));
6370 if Nkind
(Alt
) /= N_Pragma
then
6371 Choice
:= First
(Discrete_Choices
(Alt
));
6372 while Present
(Choice
) loop
6374 -- Others choice, always matches
6376 if Nkind
(Choice
) = N_Others_Choice
then
6379 -- Range, check if value is in the range
6381 elsif Nkind
(Choice
) = N_Range
then
6383 Val
>= Expr_Value
(Low_Bound
(Choice
))
6385 Val
<= Expr_Value
(High_Bound
(Choice
));
6387 -- Choice is a subtype name. Note that we know it must
6388 -- be a static subtype, since otherwise it would have
6389 -- been diagnosed as illegal.
6391 elsif Is_Entity_Name
(Choice
) and then Is_Type
(Entity
(Choice
))
6393 exit Search
when Is_In_Range
(Expr
, Etype
(Choice
),
6394 Assume_Valid
=> False);
6396 -- Choice is a subtype indication
6398 elsif Nkind
(Choice
) = N_Subtype_Indication
then
6400 C
: constant Node_Id
:= Constraint
(Choice
);
6401 R
: constant Node_Id
:= Range_Expression
(C
);
6405 Val
>= Expr_Value
(Low_Bound
(R
))
6407 Val
<= Expr_Value
(High_Bound
(R
));
6410 -- Choice is a simple expression
6413 exit Search
when Val
= Expr_Value
(Choice
);
6421 pragma Assert
(Present
(Alt
));
6424 -- The above loop *must* terminate by finding a match, since
6425 -- we know the case statement is valid, and the value of the
6426 -- expression is known at compile time. When we fall out of
6427 -- the loop, Alt points to the alternative that we know will
6428 -- be selected at run time.
6431 end Find_Static_Alternative
;
6437 function First_Actual
(Node
: Node_Id
) return Node_Id
is
6441 if No
(Parameter_Associations
(Node
)) then
6445 N
:= First
(Parameter_Associations
(Node
));
6447 if Nkind
(N
) = N_Parameter_Association
then
6448 return First_Named_Actual
(Node
);
6454 -----------------------
6455 -- Gather_Components --
6456 -----------------------
6458 procedure Gather_Components
6460 Comp_List
: Node_Id
;
6461 Governed_By
: List_Id
;
6463 Report_Errors
: out Boolean)
6467 Discrete_Choice
: Node_Id
;
6468 Comp_Item
: Node_Id
;
6470 Discrim
: Entity_Id
;
6471 Discrim_Name
: Node_Id
;
6472 Discrim_Value
: Node_Id
;
6475 Report_Errors
:= False;
6477 if No
(Comp_List
) or else Null_Present
(Comp_List
) then
6480 elsif Present
(Component_Items
(Comp_List
)) then
6481 Comp_Item
:= First
(Component_Items
(Comp_List
));
6487 while Present
(Comp_Item
) loop
6489 -- Skip the tag of a tagged record, the interface tags, as well
6490 -- as all items that are not user components (anonymous types,
6491 -- rep clauses, Parent field, controller field).
6493 if Nkind
(Comp_Item
) = N_Component_Declaration
then
6495 Comp
: constant Entity_Id
:= Defining_Identifier
(Comp_Item
);
6497 if not Is_Tag
(Comp
) and then Chars
(Comp
) /= Name_uParent
then
6498 Append_Elmt
(Comp
, Into
);
6506 if No
(Variant_Part
(Comp_List
)) then
6509 Discrim_Name
:= Name
(Variant_Part
(Comp_List
));
6510 Variant
:= First_Non_Pragma
(Variants
(Variant_Part
(Comp_List
)));
6513 -- Look for the discriminant that governs this variant part.
6514 -- The discriminant *must* be in the Governed_By List
6516 Assoc
:= First
(Governed_By
);
6517 Find_Constraint
: loop
6518 Discrim
:= First
(Choices
(Assoc
));
6519 exit Find_Constraint
when Chars
(Discrim_Name
) = Chars
(Discrim
)
6520 or else (Present
(Corresponding_Discriminant
(Entity
(Discrim
)))
6522 Chars
(Corresponding_Discriminant
(Entity
(Discrim
))) =
6523 Chars
(Discrim_Name
))
6524 or else Chars
(Original_Record_Component
(Entity
(Discrim
)))
6525 = Chars
(Discrim_Name
);
6527 if No
(Next
(Assoc
)) then
6528 if not Is_Constrained
(Typ
)
6529 and then Is_Derived_Type
(Typ
)
6530 and then Present
(Stored_Constraint
(Typ
))
6532 -- If the type is a tagged type with inherited discriminants,
6533 -- use the stored constraint on the parent in order to find
6534 -- the values of discriminants that are otherwise hidden by an
6535 -- explicit constraint. Renamed discriminants are handled in
6538 -- If several parent discriminants are renamed by a single
6539 -- discriminant of the derived type, the call to obtain the
6540 -- Corresponding_Discriminant field only retrieves the last
6541 -- of them. We recover the constraint on the others from the
6542 -- Stored_Constraint as well.
6549 D
:= First_Discriminant
(Etype
(Typ
));
6550 C
:= First_Elmt
(Stored_Constraint
(Typ
));
6551 while Present
(D
) and then Present
(C
) loop
6552 if Chars
(Discrim_Name
) = Chars
(D
) then
6553 if Is_Entity_Name
(Node
(C
))
6554 and then Entity
(Node
(C
)) = Entity
(Discrim
)
6556 -- D is renamed by Discrim, whose value is given in
6563 Make_Component_Association
(Sloc
(Typ
),
6565 (New_Occurrence_Of
(D
, Sloc
(Typ
))),
6566 Duplicate_Subexpr_No_Checks
(Node
(C
)));
6568 exit Find_Constraint
;
6571 Next_Discriminant
(D
);
6578 if No
(Next
(Assoc
)) then
6579 Error_Msg_NE
(" missing value for discriminant&",
6580 First
(Governed_By
), Discrim_Name
);
6581 Report_Errors
:= True;
6586 end loop Find_Constraint
;
6588 Discrim_Value
:= Expression
(Assoc
);
6590 if not Is_OK_Static_Expression
(Discrim_Value
) then
6592 ("value for discriminant & must be static!",
6593 Discrim_Value
, Discrim
);
6594 Why_Not_Static
(Discrim_Value
);
6595 Report_Errors
:= True;
6599 Search_For_Discriminant_Value
: declare
6605 UI_Discrim_Value
: constant Uint
:= Expr_Value
(Discrim_Value
);
6608 Find_Discrete_Value
: while Present
(Variant
) loop
6609 Discrete_Choice
:= First
(Discrete_Choices
(Variant
));
6610 while Present
(Discrete_Choice
) loop
6611 exit Find_Discrete_Value
when
6612 Nkind
(Discrete_Choice
) = N_Others_Choice
;
6614 Get_Index_Bounds
(Discrete_Choice
, Low
, High
);
6616 UI_Low
:= Expr_Value
(Low
);
6617 UI_High
:= Expr_Value
(High
);
6619 exit Find_Discrete_Value
when
6620 UI_Low
<= UI_Discrim_Value
6622 UI_High
>= UI_Discrim_Value
;
6624 Next
(Discrete_Choice
);
6627 Next_Non_Pragma
(Variant
);
6628 end loop Find_Discrete_Value
;
6629 end Search_For_Discriminant_Value
;
6631 if No
(Variant
) then
6633 ("value of discriminant & is out of range", Discrim_Value
, Discrim
);
6634 Report_Errors
:= True;
6638 -- If we have found the corresponding choice, recursively add its
6639 -- components to the Into list.
6642 (Empty
, Component_List
(Variant
), Governed_By
, Into
, Report_Errors
);
6643 end Gather_Components
;
6645 ------------------------
6646 -- Get_Actual_Subtype --
6647 ------------------------
6649 function Get_Actual_Subtype
(N
: Node_Id
) return Entity_Id
is
6650 Typ
: constant Entity_Id
:= Etype
(N
);
6651 Utyp
: Entity_Id
:= Underlying_Type
(Typ
);
6660 -- If what we have is an identifier that references a subprogram
6661 -- formal, or a variable or constant object, then we get the actual
6662 -- subtype from the referenced entity if one has been built.
6664 if Nkind
(N
) = N_Identifier
6666 (Is_Formal
(Entity
(N
))
6667 or else Ekind
(Entity
(N
)) = E_Constant
6668 or else Ekind
(Entity
(N
)) = E_Variable
)
6669 and then Present
(Actual_Subtype
(Entity
(N
)))
6671 return Actual_Subtype
(Entity
(N
));
6673 -- Actual subtype of unchecked union is always itself. We never need
6674 -- the "real" actual subtype. If we did, we couldn't get it anyway
6675 -- because the discriminant is not available. The restrictions on
6676 -- Unchecked_Union are designed to make sure that this is OK.
6678 elsif Is_Unchecked_Union
(Base_Type
(Utyp
)) then
6681 -- Here for the unconstrained case, we must find actual subtype
6682 -- No actual subtype is available, so we must build it on the fly.
6684 -- Checking the type, not the underlying type, for constrainedness
6685 -- seems to be necessary. Maybe all the tests should be on the type???
6687 elsif (not Is_Constrained
(Typ
))
6688 and then (Is_Array_Type
(Utyp
)
6689 or else (Is_Record_Type
(Utyp
)
6690 and then Has_Discriminants
(Utyp
)))
6691 and then not Has_Unknown_Discriminants
(Utyp
)
6692 and then not (Ekind
(Utyp
) = E_String_Literal_Subtype
)
6694 -- Nothing to do if in spec expression (why not???)
6696 if In_Spec_Expression
then
6699 elsif Is_Private_Type
(Typ
) and then not Has_Discriminants
(Typ
) then
6701 -- If the type has no discriminants, there is no subtype to
6702 -- build, even if the underlying type is discriminated.
6706 -- Else build the actual subtype
6709 Decl
:= Build_Actual_Subtype
(Typ
, N
);
6710 Atyp
:= Defining_Identifier
(Decl
);
6712 -- If Build_Actual_Subtype generated a new declaration then use it
6716 -- The actual subtype is an Itype, so analyze the declaration,
6717 -- but do not attach it to the tree, to get the type defined.
6719 Set_Parent
(Decl
, N
);
6720 Set_Is_Itype
(Atyp
);
6721 Analyze
(Decl
, Suppress
=> All_Checks
);
6722 Set_Associated_Node_For_Itype
(Atyp
, N
);
6723 Set_Has_Delayed_Freeze
(Atyp
, False);
6725 -- We need to freeze the actual subtype immediately. This is
6726 -- needed, because otherwise this Itype will not get frozen
6727 -- at all, and it is always safe to freeze on creation because
6728 -- any associated types must be frozen at this point.
6730 Freeze_Itype
(Atyp
, N
);
6733 -- Otherwise we did not build a declaration, so return original
6740 -- For all remaining cases, the actual subtype is the same as
6741 -- the nominal type.
6746 end Get_Actual_Subtype
;
6748 -------------------------------------
6749 -- Get_Actual_Subtype_If_Available --
6750 -------------------------------------
6752 function Get_Actual_Subtype_If_Available
(N
: Node_Id
) return Entity_Id
is
6753 Typ
: constant Entity_Id
:= Etype
(N
);
6756 -- If what we have is an identifier that references a subprogram
6757 -- formal, or a variable or constant object, then we get the actual
6758 -- subtype from the referenced entity if one has been built.
6760 if Nkind
(N
) = N_Identifier
6762 (Is_Formal
(Entity
(N
))
6763 or else Ekind
(Entity
(N
)) = E_Constant
6764 or else Ekind
(Entity
(N
)) = E_Variable
)
6765 and then Present
(Actual_Subtype
(Entity
(N
)))
6767 return Actual_Subtype
(Entity
(N
));
6769 -- Otherwise the Etype of N is returned unchanged
6774 end Get_Actual_Subtype_If_Available
;
6776 ------------------------
6777 -- Get_Body_From_Stub --
6778 ------------------------
6780 function Get_Body_From_Stub
(N
: Node_Id
) return Node_Id
is
6782 return Proper_Body
(Unit
(Library_Unit
(N
)));
6783 end Get_Body_From_Stub
;
6785 ---------------------
6786 -- Get_Cursor_Type --
6787 ---------------------
6789 function Get_Cursor_Type
6791 Typ
: Entity_Id
) return Entity_Id
6795 First_Op
: Entity_Id
;
6799 -- If error already detected, return
6801 if Error_Posted
(Aspect
) then
6805 -- The cursor type for an Iterable aspect is the return type of a
6806 -- non-overloaded First primitive operation. Locate association for
6809 Assoc
:= First
(Component_Associations
(Expression
(Aspect
)));
6811 while Present
(Assoc
) loop
6812 if Chars
(First
(Choices
(Assoc
))) = Name_First
then
6813 First_Op
:= Expression
(Assoc
);
6820 if First_Op
= Any_Id
then
6821 Error_Msg_N
("aspect Iterable must specify First operation", Aspect
);
6827 -- Locate function with desired name and profile in scope of type
6829 Func
:= First_Entity
(Scope
(Typ
));
6830 while Present
(Func
) loop
6831 if Chars
(Func
) = Chars
(First_Op
)
6832 and then Ekind
(Func
) = E_Function
6833 and then Present
(First_Formal
(Func
))
6834 and then Etype
(First_Formal
(Func
)) = Typ
6835 and then No
(Next_Formal
(First_Formal
(Func
)))
6837 if Cursor
/= Any_Type
then
6839 ("Operation First for iterable type must be unique", Aspect
);
6842 Cursor
:= Etype
(Func
);
6849 -- If not found, no way to resolve remaining primitives.
6851 if Cursor
= Any_Type
then
6853 ("No legal primitive operation First for Iterable type", Aspect
);
6857 end Get_Cursor_Type
;
6859 -------------------------------
6860 -- Get_Default_External_Name --
6861 -------------------------------
6863 function Get_Default_External_Name
(E
: Node_Or_Entity_Id
) return Node_Id
is
6865 Get_Decoded_Name_String
(Chars
(E
));
6867 if Opt
.External_Name_Imp_Casing
= Uppercase
then
6868 Set_Casing
(All_Upper_Case
);
6870 Set_Casing
(All_Lower_Case
);
6874 Make_String_Literal
(Sloc
(E
),
6875 Strval
=> String_From_Name_Buffer
);
6876 end Get_Default_External_Name
;
6878 --------------------------
6879 -- Get_Enclosing_Object --
6880 --------------------------
6882 function Get_Enclosing_Object
(N
: Node_Id
) return Entity_Id
is
6884 if Is_Entity_Name
(N
) then
6888 when N_Indexed_Component |
6890 N_Selected_Component
=>
6892 -- If not generating code, a dereference may be left implicit.
6893 -- In thoses cases, return Empty.
6895 if Is_Access_Type
(Etype
(Prefix
(N
))) then
6898 return Get_Enclosing_Object
(Prefix
(N
));
6901 when N_Type_Conversion
=>
6902 return Get_Enclosing_Object
(Expression
(N
));
6908 end Get_Enclosing_Object
;
6910 ---------------------------
6911 -- Get_Enum_Lit_From_Pos --
6912 ---------------------------
6914 function Get_Enum_Lit_From_Pos
6917 Loc
: Source_Ptr
) return Node_Id
6919 Btyp
: Entity_Id
:= Base_Type
(T
);
6923 -- In the case where the literal is of type Character, Wide_Character
6924 -- or Wide_Wide_Character or of a type derived from them, there needs
6925 -- to be some special handling since there is no explicit chain of
6926 -- literals to search. Instead, an N_Character_Literal node is created
6927 -- with the appropriate Char_Code and Chars fields.
6929 if Is_Standard_Character_Type
(T
) then
6930 Set_Character_Literal_Name
(UI_To_CC
(Pos
));
6932 Make_Character_Literal
(Loc
,
6934 Char_Literal_Value
=> Pos
);
6936 -- For all other cases, we have a complete table of literals, and
6937 -- we simply iterate through the chain of literal until the one
6938 -- with the desired position value is found.
6941 if Is_Private_Type
(Btyp
) and then Present
(Full_View
(Btyp
)) then
6942 Btyp
:= Full_View
(Btyp
);
6945 Lit
:= First_Literal
(Btyp
);
6946 for J
in 1 .. UI_To_Int
(Pos
) loop
6950 return New_Occurrence_Of
(Lit
, Loc
);
6952 end Get_Enum_Lit_From_Pos
;
6954 ---------------------------------
6955 -- Get_Ensures_From_CTC_Pragma --
6956 ---------------------------------
6958 function Get_Ensures_From_CTC_Pragma
(N
: Node_Id
) return Node_Id
is
6959 Args
: constant List_Id
:= Pragma_Argument_Associations
(N
);
6963 if List_Length
(Args
) = 4 then
6964 Res
:= Pick
(Args
, 4);
6966 elsif List_Length
(Args
) = 3 then
6967 Res
:= Pick
(Args
, 3);
6969 if Chars
(Res
) /= Name_Ensures
then
6978 end Get_Ensures_From_CTC_Pragma
;
6980 ------------------------
6981 -- Get_Generic_Entity --
6982 ------------------------
6984 function Get_Generic_Entity
(N
: Node_Id
) return Entity_Id
is
6985 Ent
: constant Entity_Id
:= Entity
(Name
(N
));
6987 if Present
(Renamed_Object
(Ent
)) then
6988 return Renamed_Object
(Ent
);
6992 end Get_Generic_Entity
;
6994 -------------------------------------
6995 -- Get_Incomplete_View_Of_Ancestor --
6996 -------------------------------------
6998 function Get_Incomplete_View_Of_Ancestor
(E
: Entity_Id
) return Entity_Id
is
6999 Cur_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
7000 Par_Scope
: Entity_Id
;
7001 Par_Type
: Entity_Id
;
7004 -- The incomplete view of an ancestor is only relevant for private
7005 -- derived types in child units.
7007 if not Is_Derived_Type
(E
)
7008 or else not Is_Child_Unit
(Cur_Unit
)
7013 Par_Scope
:= Scope
(Cur_Unit
);
7014 if No
(Par_Scope
) then
7018 Par_Type
:= Etype
(Base_Type
(E
));
7020 -- Traverse list of ancestor types until we find one declared in
7021 -- a parent or grandparent unit (two levels seem sufficient).
7023 while Present
(Par_Type
) loop
7024 if Scope
(Par_Type
) = Par_Scope
7025 or else Scope
(Par_Type
) = Scope
(Par_Scope
)
7029 elsif not Is_Derived_Type
(Par_Type
) then
7033 Par_Type
:= Etype
(Base_Type
(Par_Type
));
7037 -- If none found, there is no relevant ancestor type.
7041 end Get_Incomplete_View_Of_Ancestor
;
7043 ----------------------
7044 -- Get_Index_Bounds --
7045 ----------------------
7047 procedure Get_Index_Bounds
(N
: Node_Id
; L
, H
: out Node_Id
) is
7048 Kind
: constant Node_Kind
:= Nkind
(N
);
7052 if Kind
= N_Range
then
7054 H
:= High_Bound
(N
);
7056 elsif Kind
= N_Subtype_Indication
then
7057 R
:= Range_Expression
(Constraint
(N
));
7065 L
:= Low_Bound
(Range_Expression
(Constraint
(N
)));
7066 H
:= High_Bound
(Range_Expression
(Constraint
(N
)));
7069 elsif Is_Entity_Name
(N
) and then Is_Type
(Entity
(N
)) then
7070 if Error_Posted
(Scalar_Range
(Entity
(N
))) then
7074 elsif Nkind
(Scalar_Range
(Entity
(N
))) = N_Subtype_Indication
then
7075 Get_Index_Bounds
(Scalar_Range
(Entity
(N
)), L
, H
);
7078 L
:= Low_Bound
(Scalar_Range
(Entity
(N
)));
7079 H
:= High_Bound
(Scalar_Range
(Entity
(N
)));
7083 -- N is an expression, indicating a range with one value
7088 end Get_Index_Bounds
;
7090 ---------------------------------
7091 -- Get_Iterable_Type_Primitive --
7092 ---------------------------------
7094 function Get_Iterable_Type_Primitive
7096 Nam
: Name_Id
) return Entity_Id
7098 Funcs
: constant Node_Id
:= Find_Value_Of_Aspect
(Typ
, Aspect_Iterable
);
7106 Assoc
:= First
(Component_Associations
(Funcs
));
7107 while Present
(Assoc
) loop
7108 if Chars
(First
(Choices
(Assoc
))) = Nam
then
7109 return Entity
(Expression
(Assoc
));
7112 Assoc
:= Next
(Assoc
);
7117 end Get_Iterable_Type_Primitive
;
7119 ----------------------------------
7120 -- Get_Library_Unit_Name_string --
7121 ----------------------------------
7123 procedure Get_Library_Unit_Name_String
(Decl_Node
: Node_Id
) is
7124 Unit_Name_Id
: constant Unit_Name_Type
:= Get_Unit_Name
(Decl_Node
);
7127 Get_Unit_Name_String
(Unit_Name_Id
);
7129 -- Remove seven last character (" (spec)" or " (body)")
7131 Name_Len
:= Name_Len
- 7;
7132 pragma Assert
(Name_Buffer
(Name_Len
+ 1) = ' ');
7133 end Get_Library_Unit_Name_String
;
7135 ------------------------
7136 -- Get_Name_Entity_Id --
7137 ------------------------
7139 function Get_Name_Entity_Id
(Id
: Name_Id
) return Entity_Id
is
7141 return Entity_Id
(Get_Name_Table_Info
(Id
));
7142 end Get_Name_Entity_Id
;
7144 ------------------------------
7145 -- Get_Name_From_CTC_Pragma --
7146 ------------------------------
7148 function Get_Name_From_CTC_Pragma
(N
: Node_Id
) return String_Id
is
7149 Arg
: constant Node_Id
:=
7150 Get_Pragma_Arg
(First
(Pragma_Argument_Associations
(N
)));
7152 return Strval
(Expr_Value_S
(Arg
));
7153 end Get_Name_From_CTC_Pragma
;
7155 -----------------------
7156 -- Get_Parent_Entity --
7157 -----------------------
7159 function Get_Parent_Entity
(Unit
: Node_Id
) return Entity_Id
is
7161 if Nkind
(Unit
) = N_Package_Body
7162 and then Nkind
(Original_Node
(Unit
)) = N_Package_Instantiation
7164 return Defining_Entity
7165 (Specification
(Instance_Spec
(Original_Node
(Unit
))));
7166 elsif Nkind
(Unit
) = N_Package_Instantiation
then
7167 return Defining_Entity
(Specification
(Instance_Spec
(Unit
)));
7169 return Defining_Entity
(Unit
);
7171 end Get_Parent_Entity
;
7176 function Get_Pragma_Id
(N
: Node_Id
) return Pragma_Id
is
7178 return Get_Pragma_Id
(Pragma_Name
(N
));
7181 -----------------------
7182 -- Get_Reason_String --
7183 -----------------------
7185 procedure Get_Reason_String
(N
: Node_Id
) is
7187 if Nkind
(N
) = N_String_Literal
then
7188 Store_String_Chars
(Strval
(N
));
7190 elsif Nkind
(N
) = N_Op_Concat
then
7191 Get_Reason_String
(Left_Opnd
(N
));
7192 Get_Reason_String
(Right_Opnd
(N
));
7194 -- If not of required form, error
7198 ("Reason for pragma Warnings has wrong form", N
);
7200 ("\must be string literal or concatenation of string literals", N
);
7203 end Get_Reason_String
;
7205 ---------------------------
7206 -- Get_Referenced_Object --
7207 ---------------------------
7209 function Get_Referenced_Object
(N
: Node_Id
) return Node_Id
is
7214 while Is_Entity_Name
(R
)
7215 and then Present
(Renamed_Object
(Entity
(R
)))
7217 R
:= Renamed_Object
(Entity
(R
));
7221 end Get_Referenced_Object
;
7223 ------------------------
7224 -- Get_Renamed_Entity --
7225 ------------------------
7227 function Get_Renamed_Entity
(E
: Entity_Id
) return Entity_Id
is
7232 while Present
(Renamed_Entity
(R
)) loop
7233 R
:= Renamed_Entity
(R
);
7237 end Get_Renamed_Entity
;
7239 ----------------------------------
7240 -- Get_Requires_From_CTC_Pragma --
7241 ----------------------------------
7243 function Get_Requires_From_CTC_Pragma
(N
: Node_Id
) return Node_Id
is
7244 Args
: constant List_Id
:= Pragma_Argument_Associations
(N
);
7248 if List_Length
(Args
) >= 3 then
7249 Res
:= Pick
(Args
, 3);
7251 if Chars
(Res
) /= Name_Requires
then
7260 end Get_Requires_From_CTC_Pragma
;
7262 -------------------------
7263 -- Get_Subprogram_Body --
7264 -------------------------
7266 function Get_Subprogram_Body
(E
: Entity_Id
) return Node_Id
is
7270 Decl
:= Unit_Declaration_Node
(E
);
7272 if Nkind
(Decl
) = N_Subprogram_Body
then
7275 -- The below comment is bad, because it is possible for
7276 -- Nkind (Decl) to be an N_Subprogram_Body_Stub ???
7278 else -- Nkind (Decl) = N_Subprogram_Declaration
7280 if Present
(Corresponding_Body
(Decl
)) then
7281 return Unit_Declaration_Node
(Corresponding_Body
(Decl
));
7283 -- Imported subprogram case
7289 end Get_Subprogram_Body
;
7291 ---------------------------
7292 -- Get_Subprogram_Entity --
7293 ---------------------------
7295 function Get_Subprogram_Entity
(Nod
: Node_Id
) return Entity_Id
is
7297 Subp_Id
: Entity_Id
;
7300 if Nkind
(Nod
) = N_Accept_Statement
then
7301 Subp
:= Entry_Direct_Name
(Nod
);
7303 elsif Nkind
(Nod
) = N_Slice
then
7304 Subp
:= Prefix
(Nod
);
7310 -- Strip the subprogram call
7313 if Nkind_In
(Subp
, N_Explicit_Dereference
,
7314 N_Indexed_Component
,
7315 N_Selected_Component
)
7317 Subp
:= Prefix
(Subp
);
7319 elsif Nkind_In
(Subp
, N_Type_Conversion
,
7320 N_Unchecked_Type_Conversion
)
7322 Subp
:= Expression
(Subp
);
7329 -- Extract the entity of the subprogram call
7331 if Is_Entity_Name
(Subp
) then
7332 Subp_Id
:= Entity
(Subp
);
7334 if Ekind
(Subp_Id
) = E_Access_Subprogram_Type
then
7335 Subp_Id
:= Directly_Designated_Type
(Subp_Id
);
7338 if Is_Subprogram
(Subp_Id
) then
7344 -- The search did not find a construct that denotes a subprogram
7349 end Get_Subprogram_Entity
;
7351 -----------------------------
7352 -- Get_Task_Body_Procedure --
7353 -----------------------------
7355 function Get_Task_Body_Procedure
(E
: Entity_Id
) return Node_Id
is
7357 -- Note: A task type may be the completion of a private type with
7358 -- discriminants. When performing elaboration checks on a task
7359 -- declaration, the current view of the type may be the private one,
7360 -- and the procedure that holds the body of the task is held in its
7363 -- This is an odd function, why not have Task_Body_Procedure do
7364 -- the following digging???
7366 return Task_Body_Procedure
(Underlying_Type
(Root_Type
(E
)));
7367 end Get_Task_Body_Procedure
;
7369 -----------------------
7370 -- Has_Access_Values --
7371 -----------------------
7373 function Has_Access_Values
(T
: Entity_Id
) return Boolean is
7374 Typ
: constant Entity_Id
:= Underlying_Type
(T
);
7377 -- Case of a private type which is not completed yet. This can only
7378 -- happen in the case of a generic format type appearing directly, or
7379 -- as a component of the type to which this function is being applied
7380 -- at the top level. Return False in this case, since we certainly do
7381 -- not know that the type contains access types.
7386 elsif Is_Access_Type
(Typ
) then
7389 elsif Is_Array_Type
(Typ
) then
7390 return Has_Access_Values
(Component_Type
(Typ
));
7392 elsif Is_Record_Type
(Typ
) then
7397 -- Loop to Check components
7399 Comp
:= First_Component_Or_Discriminant
(Typ
);
7400 while Present
(Comp
) loop
7402 -- Check for access component, tag field does not count, even
7403 -- though it is implemented internally using an access type.
7405 if Has_Access_Values
(Etype
(Comp
))
7406 and then Chars
(Comp
) /= Name_uTag
7411 Next_Component_Or_Discriminant
(Comp
);
7420 end Has_Access_Values
;
7422 ------------------------------
7423 -- Has_Compatible_Alignment --
7424 ------------------------------
7426 function Has_Compatible_Alignment
7428 Expr
: Node_Id
) return Alignment_Result
7430 function Has_Compatible_Alignment_Internal
7433 Default
: Alignment_Result
) return Alignment_Result
;
7434 -- This is the internal recursive function that actually does the work.
7435 -- There is one additional parameter, which says what the result should
7436 -- be if no alignment information is found, and there is no definite
7437 -- indication of compatible alignments. At the outer level, this is set
7438 -- to Unknown, but for internal recursive calls in the case where types
7439 -- are known to be correct, it is set to Known_Compatible.
7441 ---------------------------------------
7442 -- Has_Compatible_Alignment_Internal --
7443 ---------------------------------------
7445 function Has_Compatible_Alignment_Internal
7448 Default
: Alignment_Result
) return Alignment_Result
7450 Result
: Alignment_Result
:= Known_Compatible
;
7451 -- Holds the current status of the result. Note that once a value of
7452 -- Known_Incompatible is set, it is sticky and does not get changed
7453 -- to Unknown (the value in Result only gets worse as we go along,
7456 Offs
: Uint
:= No_Uint
;
7457 -- Set to a factor of the offset from the base object when Expr is a
7458 -- selected or indexed component, based on Component_Bit_Offset and
7459 -- Component_Size respectively. A negative value is used to represent
7460 -- a value which is not known at compile time.
7462 procedure Check_Prefix
;
7463 -- Checks the prefix recursively in the case where the expression
7464 -- is an indexed or selected component.
7466 procedure Set_Result
(R
: Alignment_Result
);
7467 -- If R represents a worse outcome (unknown instead of known
7468 -- compatible, or known incompatible), then set Result to R.
7474 procedure Check_Prefix
is
7476 -- The subtlety here is that in doing a recursive call to check
7477 -- the prefix, we have to decide what to do in the case where we
7478 -- don't find any specific indication of an alignment problem.
7480 -- At the outer level, we normally set Unknown as the result in
7481 -- this case, since we can only set Known_Compatible if we really
7482 -- know that the alignment value is OK, but for the recursive
7483 -- call, in the case where the types match, and we have not
7484 -- specified a peculiar alignment for the object, we are only
7485 -- concerned about suspicious rep clauses, the default case does
7486 -- not affect us, since the compiler will, in the absence of such
7487 -- rep clauses, ensure that the alignment is correct.
7489 if Default
= Known_Compatible
7491 (Etype
(Obj
) = Etype
(Expr
)
7492 and then (Unknown_Alignment
(Obj
)
7494 Alignment
(Obj
) = Alignment
(Etype
(Obj
))))
7497 (Has_Compatible_Alignment_Internal
7498 (Obj
, Prefix
(Expr
), Known_Compatible
));
7500 -- In all other cases, we need a full check on the prefix
7504 (Has_Compatible_Alignment_Internal
7505 (Obj
, Prefix
(Expr
), Unknown
));
7513 procedure Set_Result
(R
: Alignment_Result
) is
7520 -- Start of processing for Has_Compatible_Alignment_Internal
7523 -- If Expr is a selected component, we must make sure there is no
7524 -- potentially troublesome component clause, and that the record is
7527 if Nkind
(Expr
) = N_Selected_Component
then
7529 -- Packed record always generate unknown alignment
7531 if Is_Packed
(Etype
(Prefix
(Expr
))) then
7532 Set_Result
(Unknown
);
7535 -- Check prefix and component offset
7538 Offs
:= Component_Bit_Offset
(Entity
(Selector_Name
(Expr
)));
7540 -- If Expr is an indexed component, we must make sure there is no
7541 -- potentially troublesome Component_Size clause and that the array
7542 -- is not bit-packed.
7544 elsif Nkind
(Expr
) = N_Indexed_Component
then
7546 Typ
: constant Entity_Id
:= Etype
(Prefix
(Expr
));
7547 Ind
: constant Node_Id
:= First_Index
(Typ
);
7550 -- Bit packed array always generates unknown alignment
7552 if Is_Bit_Packed_Array
(Typ
) then
7553 Set_Result
(Unknown
);
7556 -- Check prefix and component offset
7559 Offs
:= Component_Size
(Typ
);
7561 -- Small optimization: compute the full offset when possible
7564 and then Offs
> Uint_0
7565 and then Present
(Ind
)
7566 and then Nkind
(Ind
) = N_Range
7567 and then Compile_Time_Known_Value
(Low_Bound
(Ind
))
7568 and then Compile_Time_Known_Value
(First
(Expressions
(Expr
)))
7570 Offs
:= Offs
* (Expr_Value
(First
(Expressions
(Expr
)))
7571 - Expr_Value
(Low_Bound
((Ind
))));
7576 -- If we have a null offset, the result is entirely determined by
7577 -- the base object and has already been computed recursively.
7579 if Offs
= Uint_0
then
7582 -- Case where we know the alignment of the object
7584 elsif Known_Alignment
(Obj
) then
7586 ObjA
: constant Uint
:= Alignment
(Obj
);
7587 ExpA
: Uint
:= No_Uint
;
7588 SizA
: Uint
:= No_Uint
;
7591 -- If alignment of Obj is 1, then we are always OK
7594 Set_Result
(Known_Compatible
);
7596 -- Alignment of Obj is greater than 1, so we need to check
7599 -- If we have an offset, see if it is compatible
7601 if Offs
/= No_Uint
and Offs
> Uint_0
then
7602 if Offs
mod (System_Storage_Unit
* ObjA
) /= 0 then
7603 Set_Result
(Known_Incompatible
);
7606 -- See if Expr is an object with known alignment
7608 elsif Is_Entity_Name
(Expr
)
7609 and then Known_Alignment
(Entity
(Expr
))
7611 ExpA
:= Alignment
(Entity
(Expr
));
7613 -- Otherwise, we can use the alignment of the type of
7614 -- Expr given that we already checked for
7615 -- discombobulating rep clauses for the cases of indexed
7616 -- and selected components above.
7618 elsif Known_Alignment
(Etype
(Expr
)) then
7619 ExpA
:= Alignment
(Etype
(Expr
));
7621 -- Otherwise the alignment is unknown
7624 Set_Result
(Default
);
7627 -- If we got an alignment, see if it is acceptable
7629 if ExpA
/= No_Uint
and then ExpA
< ObjA
then
7630 Set_Result
(Known_Incompatible
);
7633 -- If Expr is not a piece of a larger object, see if size
7634 -- is given. If so, check that it is not too small for the
7635 -- required alignment.
7637 if Offs
/= No_Uint
then
7640 -- See if Expr is an object with known size
7642 elsif Is_Entity_Name
(Expr
)
7643 and then Known_Static_Esize
(Entity
(Expr
))
7645 SizA
:= Esize
(Entity
(Expr
));
7647 -- Otherwise, we check the object size of the Expr type
7649 elsif Known_Static_Esize
(Etype
(Expr
)) then
7650 SizA
:= Esize
(Etype
(Expr
));
7653 -- If we got a size, see if it is a multiple of the Obj
7654 -- alignment, if not, then the alignment cannot be
7655 -- acceptable, since the size is always a multiple of the
7658 if SizA
/= No_Uint
then
7659 if SizA
mod (ObjA
* Ttypes
.System_Storage_Unit
) /= 0 then
7660 Set_Result
(Known_Incompatible
);
7666 -- If we do not know required alignment, any non-zero offset is a
7667 -- potential problem (but certainly may be OK, so result is unknown).
7669 elsif Offs
/= No_Uint
then
7670 Set_Result
(Unknown
);
7672 -- If we can't find the result by direct comparison of alignment
7673 -- values, then there is still one case that we can determine known
7674 -- result, and that is when we can determine that the types are the
7675 -- same, and no alignments are specified. Then we known that the
7676 -- alignments are compatible, even if we don't know the alignment
7677 -- value in the front end.
7679 elsif Etype
(Obj
) = Etype
(Expr
) then
7681 -- Types are the same, but we have to check for possible size
7682 -- and alignments on the Expr object that may make the alignment
7683 -- different, even though the types are the same.
7685 if Is_Entity_Name
(Expr
) then
7687 -- First check alignment of the Expr object. Any alignment less
7688 -- than Maximum_Alignment is worrisome since this is the case
7689 -- where we do not know the alignment of Obj.
7691 if Known_Alignment
(Entity
(Expr
))
7692 and then UI_To_Int
(Alignment
(Entity
(Expr
))) <
7693 Ttypes
.Maximum_Alignment
7695 Set_Result
(Unknown
);
7697 -- Now check size of Expr object. Any size that is not an
7698 -- even multiple of Maximum_Alignment is also worrisome
7699 -- since it may cause the alignment of the object to be less
7700 -- than the alignment of the type.
7702 elsif Known_Static_Esize
(Entity
(Expr
))
7704 (UI_To_Int
(Esize
(Entity
(Expr
))) mod
7705 (Ttypes
.Maximum_Alignment
* Ttypes
.System_Storage_Unit
))
7708 Set_Result
(Unknown
);
7710 -- Otherwise same type is decisive
7713 Set_Result
(Known_Compatible
);
7717 -- Another case to deal with is when there is an explicit size or
7718 -- alignment clause when the types are not the same. If so, then the
7719 -- result is Unknown. We don't need to do this test if the Default is
7720 -- Unknown, since that result will be set in any case.
7722 elsif Default
/= Unknown
7723 and then (Has_Size_Clause
(Etype
(Expr
))
7725 Has_Alignment_Clause
(Etype
(Expr
)))
7727 Set_Result
(Unknown
);
7729 -- If no indication found, set default
7732 Set_Result
(Default
);
7735 -- Return worst result found
7738 end Has_Compatible_Alignment_Internal
;
7740 -- Start of processing for Has_Compatible_Alignment
7743 -- If Obj has no specified alignment, then set alignment from the type
7744 -- alignment. Perhaps we should always do this, but for sure we should
7745 -- do it when there is an address clause since we can do more if the
7746 -- alignment is known.
7748 if Unknown_Alignment
(Obj
) then
7749 Set_Alignment
(Obj
, Alignment
(Etype
(Obj
)));
7752 -- Now do the internal call that does all the work
7754 return Has_Compatible_Alignment_Internal
(Obj
, Expr
, Unknown
);
7755 end Has_Compatible_Alignment
;
7757 ----------------------
7758 -- Has_Declarations --
7759 ----------------------
7761 function Has_Declarations
(N
: Node_Id
) return Boolean is
7763 return Nkind_In
(Nkind
(N
), N_Accept_Statement
,
7765 N_Compilation_Unit_Aux
,
7771 N_Package_Specification
);
7772 end Has_Declarations
;
7774 ---------------------------------
7775 -- Has_Defaulted_Discriminants --
7776 ---------------------------------
7778 function Has_Defaulted_Discriminants
(Typ
: Entity_Id
) return Boolean is
7780 return Has_Discriminants
(Typ
)
7781 and then Present
(First_Discriminant
(Typ
))
7782 and then Present
(Discriminant_Default_Value
7783 (First_Discriminant
(Typ
)));
7784 end Has_Defaulted_Discriminants
;
7790 function Has_Denormals
(E
: Entity_Id
) return Boolean is
7792 return Is_Floating_Point_Type
(E
) and then Denorm_On_Target
;
7795 -------------------------------------------
7796 -- Has_Discriminant_Dependent_Constraint --
7797 -------------------------------------------
7799 function Has_Discriminant_Dependent_Constraint
7800 (Comp
: Entity_Id
) return Boolean
7802 Comp_Decl
: constant Node_Id
:= Parent
(Comp
);
7803 Subt_Indic
: Node_Id
;
7808 -- Discriminants can't depend on discriminants
7810 if Ekind
(Comp
) = E_Discriminant
then
7814 Subt_Indic
:= Subtype_Indication
(Component_Definition
(Comp_Decl
));
7816 if Nkind
(Subt_Indic
) = N_Subtype_Indication
then
7817 Constr
:= Constraint
(Subt_Indic
);
7819 if Nkind
(Constr
) = N_Index_Or_Discriminant_Constraint
then
7820 Assn
:= First
(Constraints
(Constr
));
7821 while Present
(Assn
) loop
7822 case Nkind
(Assn
) is
7823 when N_Subtype_Indication |
7827 if Depends_On_Discriminant
(Assn
) then
7831 when N_Discriminant_Association
=>
7832 if Depends_On_Discriminant
(Expression
(Assn
)) then
7847 end Has_Discriminant_Dependent_Constraint
;
7849 --------------------------
7850 -- Has_Enabled_Property --
7851 --------------------------
7853 function Has_Enabled_Property
7854 (Item_Id
: Entity_Id
;
7855 Property
: Name_Id
) return Boolean
7857 function State_Has_Enabled_Property
return Boolean;
7858 -- Determine whether a state denoted by Item_Id has the property enabled
7860 function Variable_Has_Enabled_Property
return Boolean;
7861 -- Determine whether a variable denoted by Item_Id has the property
7864 --------------------------------
7865 -- State_Has_Enabled_Property --
7866 --------------------------------
7868 function State_Has_Enabled_Property
return Boolean is
7869 Decl
: constant Node_Id
:= Parent
(Item_Id
);
7877 -- The declaration of an external abstract state appears as an
7878 -- extension aggregate. If this is not the case, properties can never
7881 if Nkind
(Decl
) /= N_Extension_Aggregate
then
7885 -- When External appears as a simple option, it automatically enables
7888 Opt
:= First
(Expressions
(Decl
));
7889 while Present
(Opt
) loop
7890 if Nkind
(Opt
) = N_Identifier
7891 and then Chars
(Opt
) = Name_External
7899 -- When External specifies particular properties, inspect those and
7900 -- find the desired one (if any).
7902 Opt
:= First
(Component_Associations
(Decl
));
7903 while Present
(Opt
) loop
7904 Opt_Nam
:= First
(Choices
(Opt
));
7906 if Nkind
(Opt_Nam
) = N_Identifier
7907 and then Chars
(Opt_Nam
) = Name_External
7909 Props
:= Expression
(Opt
);
7911 -- Multiple properties appear as an aggregate
7913 if Nkind
(Props
) = N_Aggregate
then
7915 -- Simple property form
7917 Prop
:= First
(Expressions
(Props
));
7918 while Present
(Prop
) loop
7919 if Chars
(Prop
) = Property
then
7926 -- Property with expression form
7928 Prop
:= First
(Component_Associations
(Props
));
7929 while Present
(Prop
) loop
7930 Prop_Nam
:= First
(Choices
(Prop
));
7932 -- The property can be represented in two ways:
7933 -- others => <value>
7934 -- <property> => <value>
7936 if Nkind
(Prop_Nam
) = N_Others_Choice
7937 or else (Nkind
(Prop_Nam
) = N_Identifier
7938 and then Chars
(Prop_Nam
) = Property
)
7940 return Is_True
(Expr_Value
(Expression
(Prop
)));
7949 return Chars
(Props
) = Property
;
7957 end State_Has_Enabled_Property
;
7959 -----------------------------------
7960 -- Variable_Has_Enabled_Property --
7961 -----------------------------------
7963 function Variable_Has_Enabled_Property
return Boolean is
7964 function Is_Enabled
(Prag
: Node_Id
) return Boolean;
7965 -- Determine whether property pragma Prag (if present) denotes an
7966 -- enabled property.
7972 function Is_Enabled
(Prag
: Node_Id
) return Boolean is
7976 if Present
(Prag
) then
7977 Arg2
:= Next
(First
(Pragma_Argument_Associations
(Prag
)));
7979 -- The pragma has an optional Boolean expression, the related
7980 -- property is enabled only when the expression evaluates to
7983 if Present
(Arg2
) then
7984 return Is_True
(Expr_Value
(Get_Pragma_Arg
(Arg2
)));
7986 -- Otherwise the lack of expression enables the property by
7993 -- The property was never set in the first place
8002 AR
: constant Node_Id
:=
8003 Get_Pragma
(Item_Id
, Pragma_Async_Readers
);
8004 AW
: constant Node_Id
:=
8005 Get_Pragma
(Item_Id
, Pragma_Async_Writers
);
8006 ER
: constant Node_Id
:=
8007 Get_Pragma
(Item_Id
, Pragma_Effective_Reads
);
8008 EW
: constant Node_Id
:=
8009 Get_Pragma
(Item_Id
, Pragma_Effective_Writes
);
8011 -- Start of processing for Variable_Has_Enabled_Property
8014 -- A non-effectively volatile object can never possess external
8017 if not Is_Effectively_Volatile
(Item_Id
) then
8020 -- External properties related to variables come in two flavors -
8021 -- explicit and implicit. The explicit case is characterized by the
8022 -- presence of a property pragma with an optional Boolean flag. The
8023 -- property is enabled when the flag evaluates to True or the flag is
8024 -- missing altogether.
8026 elsif Property
= Name_Async_Readers
and then Is_Enabled
(AR
) then
8029 elsif Property
= Name_Async_Writers
and then Is_Enabled
(AW
) then
8032 elsif Property
= Name_Effective_Reads
and then Is_Enabled
(ER
) then
8035 elsif Property
= Name_Effective_Writes
and then Is_Enabled
(EW
) then
8038 -- The implicit case lacks all property pragmas
8040 elsif No
(AR
) and then No
(AW
) and then No
(ER
) and then No
(EW
) then
8046 end Variable_Has_Enabled_Property
;
8048 -- Start of processing for Has_Enabled_Property
8051 -- Abstract states and variables have a flexible scheme of specifying
8052 -- external properties.
8054 if Ekind
(Item_Id
) = E_Abstract_State
then
8055 return State_Has_Enabled_Property
;
8057 elsif Ekind
(Item_Id
) = E_Variable
then
8058 return Variable_Has_Enabled_Property
;
8060 -- Otherwise a property is enabled when the related item is effectively
8064 return Is_Effectively_Volatile
(Item_Id
);
8066 end Has_Enabled_Property
;
8068 --------------------
8069 -- Has_Infinities --
8070 --------------------
8072 function Has_Infinities
(E
: Entity_Id
) return Boolean is
8075 Is_Floating_Point_Type
(E
)
8076 and then Nkind
(Scalar_Range
(E
)) = N_Range
8077 and then Includes_Infinities
(Scalar_Range
(E
));
8080 --------------------
8081 -- Has_Interfaces --
8082 --------------------
8084 function Has_Interfaces
8086 Use_Full_View
: Boolean := True) return Boolean
8088 Typ
: Entity_Id
:= Base_Type
(T
);
8091 -- Handle concurrent types
8093 if Is_Concurrent_Type
(Typ
) then
8094 Typ
:= Corresponding_Record_Type
(Typ
);
8097 if not Present
(Typ
)
8098 or else not Is_Record_Type
(Typ
)
8099 or else not Is_Tagged_Type
(Typ
)
8104 -- Handle private types
8106 if Use_Full_View
and then Present
(Full_View
(Typ
)) then
8107 Typ
:= Full_View
(Typ
);
8110 -- Handle concurrent record types
8112 if Is_Concurrent_Record_Type
(Typ
)
8113 and then Is_Non_Empty_List
(Abstract_Interface_List
(Typ
))
8119 if Is_Interface
(Typ
)
8121 (Is_Record_Type
(Typ
)
8122 and then Present
(Interfaces
(Typ
))
8123 and then not Is_Empty_Elmt_List
(Interfaces
(Typ
)))
8128 exit when Etype
(Typ
) = Typ
8130 -- Handle private types
8132 or else (Present
(Full_View
(Etype
(Typ
)))
8133 and then Full_View
(Etype
(Typ
)) = Typ
)
8135 -- Protect frontend against wrong sources with cyclic derivations
8137 or else Etype
(Typ
) = T
;
8139 -- Climb to the ancestor type handling private types
8141 if Present
(Full_View
(Etype
(Typ
))) then
8142 Typ
:= Full_View
(Etype
(Typ
));
8151 ---------------------------------
8152 -- Has_No_Obvious_Side_Effects --
8153 ---------------------------------
8155 function Has_No_Obvious_Side_Effects
(N
: Node_Id
) return Boolean is
8157 -- For now, just handle literals, constants, and non-volatile
8158 -- variables and expressions combining these with operators or
8159 -- short circuit forms.
8161 if Nkind
(N
) in N_Numeric_Or_String_Literal
then
8164 elsif Nkind
(N
) = N_Character_Literal
then
8167 elsif Nkind
(N
) in N_Unary_Op
then
8168 return Has_No_Obvious_Side_Effects
(Right_Opnd
(N
));
8170 elsif Nkind
(N
) in N_Binary_Op
or else Nkind
(N
) in N_Short_Circuit
then
8171 return Has_No_Obvious_Side_Effects
(Left_Opnd
(N
))
8173 Has_No_Obvious_Side_Effects
(Right_Opnd
(N
));
8175 elsif Nkind
(N
) = N_Expression_With_Actions
8176 and then Is_Empty_List
(Actions
(N
))
8178 return Has_No_Obvious_Side_Effects
(Expression
(N
));
8180 elsif Nkind
(N
) in N_Has_Entity
then
8181 return Present
(Entity
(N
))
8182 and then Ekind_In
(Entity
(N
), E_Variable
,
8184 E_Enumeration_Literal
,
8188 and then not Is_Volatile
(Entity
(N
));
8193 end Has_No_Obvious_Side_Effects
;
8195 ------------------------
8196 -- Has_Null_Exclusion --
8197 ------------------------
8199 function Has_Null_Exclusion
(N
: Node_Id
) return Boolean is
8202 when N_Access_Definition |
8203 N_Access_Function_Definition |
8204 N_Access_Procedure_Definition |
8205 N_Access_To_Object_Definition |
8207 N_Derived_Type_Definition |
8208 N_Function_Specification |
8209 N_Subtype_Declaration
=>
8210 return Null_Exclusion_Present
(N
);
8212 when N_Component_Definition |
8213 N_Formal_Object_Declaration |
8214 N_Object_Renaming_Declaration
=>
8215 if Present
(Subtype_Mark
(N
)) then
8216 return Null_Exclusion_Present
(N
);
8217 else pragma Assert
(Present
(Access_Definition
(N
)));
8218 return Null_Exclusion_Present
(Access_Definition
(N
));
8221 when N_Discriminant_Specification
=>
8222 if Nkind
(Discriminant_Type
(N
)) = N_Access_Definition
then
8223 return Null_Exclusion_Present
(Discriminant_Type
(N
));
8225 return Null_Exclusion_Present
(N
);
8228 when N_Object_Declaration
=>
8229 if Nkind
(Object_Definition
(N
)) = N_Access_Definition
then
8230 return Null_Exclusion_Present
(Object_Definition
(N
));
8232 return Null_Exclusion_Present
(N
);
8235 when N_Parameter_Specification
=>
8236 if Nkind
(Parameter_Type
(N
)) = N_Access_Definition
then
8237 return Null_Exclusion_Present
(Parameter_Type
(N
));
8239 return Null_Exclusion_Present
(N
);
8246 end Has_Null_Exclusion
;
8248 ------------------------
8249 -- Has_Null_Extension --
8250 ------------------------
8252 function Has_Null_Extension
(T
: Entity_Id
) return Boolean is
8253 B
: constant Entity_Id
:= Base_Type
(T
);
8258 if Nkind
(Parent
(B
)) = N_Full_Type_Declaration
8259 and then Present
(Record_Extension_Part
(Type_Definition
(Parent
(B
))))
8261 Ext
:= Record_Extension_Part
(Type_Definition
(Parent
(B
)));
8263 if Present
(Ext
) then
8264 if Null_Present
(Ext
) then
8267 Comps
:= Component_List
(Ext
);
8269 -- The null component list is rewritten during analysis to
8270 -- include the parent component. Any other component indicates
8271 -- that the extension was not originally null.
8273 return Null_Present
(Comps
)
8274 or else No
(Next
(First
(Component_Items
(Comps
))));
8283 end Has_Null_Extension
;
8285 -------------------------------
8286 -- Has_Overriding_Initialize --
8287 -------------------------------
8289 function Has_Overriding_Initialize
(T
: Entity_Id
) return Boolean is
8290 BT
: constant Entity_Id
:= Base_Type
(T
);
8294 if Is_Controlled
(BT
) then
8295 if Is_RTU
(Scope
(BT
), Ada_Finalization
) then
8298 elsif Present
(Primitive_Operations
(BT
)) then
8299 P
:= First_Elmt
(Primitive_Operations
(BT
));
8300 while Present
(P
) loop
8302 Init
: constant Entity_Id
:= Node
(P
);
8303 Formal
: constant Entity_Id
:= First_Formal
(Init
);
8305 if Ekind
(Init
) = E_Procedure
8306 and then Chars
(Init
) = Name_Initialize
8307 and then Comes_From_Source
(Init
)
8308 and then Present
(Formal
)
8309 and then Etype
(Formal
) = BT
8310 and then No
(Next_Formal
(Formal
))
8311 and then (Ada_Version
< Ada_2012
8312 or else not Null_Present
(Parent
(Init
)))
8322 -- Here if type itself does not have a non-null Initialize operation:
8323 -- check immediate ancestor.
8325 if Is_Derived_Type
(BT
)
8326 and then Has_Overriding_Initialize
(Etype
(BT
))
8333 end Has_Overriding_Initialize
;
8335 --------------------------------------
8336 -- Has_Preelaborable_Initialization --
8337 --------------------------------------
8339 function Has_Preelaborable_Initialization
(E
: Entity_Id
) return Boolean is
8342 procedure Check_Components
(E
: Entity_Id
);
8343 -- Check component/discriminant chain, sets Has_PE False if a component
8344 -- or discriminant does not meet the preelaborable initialization rules.
8346 ----------------------
8347 -- Check_Components --
8348 ----------------------
8350 procedure Check_Components
(E
: Entity_Id
) is
8354 function Is_Preelaborable_Expression
(N
: Node_Id
) return Boolean;
8355 -- Returns True if and only if the expression denoted by N does not
8356 -- violate restrictions on preelaborable constructs (RM-10.2.1(5-9)).
8358 ---------------------------------
8359 -- Is_Preelaborable_Expression --
8360 ---------------------------------
8362 function Is_Preelaborable_Expression
(N
: Node_Id
) return Boolean is
8366 Comp_Type
: Entity_Id
;
8367 Is_Array_Aggr
: Boolean;
8370 if Is_OK_Static_Expression
(N
) then
8373 elsif Nkind
(N
) = N_Null
then
8376 -- Attributes are allowed in general, even if their prefix is a
8377 -- formal type. (It seems that certain attributes known not to be
8378 -- static might not be allowed, but there are no rules to prevent
8381 elsif Nkind
(N
) = N_Attribute_Reference
then
8384 -- The name of a discriminant evaluated within its parent type is
8385 -- defined to be preelaborable (10.2.1(8)). Note that we test for
8386 -- names that denote discriminals as well as discriminants to
8387 -- catch references occurring within init procs.
8389 elsif Is_Entity_Name
(N
)
8391 (Ekind
(Entity
(N
)) = E_Discriminant
8392 or else (Ekind_In
(Entity
(N
), E_Constant
, E_In_Parameter
)
8393 and then Present
(Discriminal_Link
(Entity
(N
)))))
8397 elsif Nkind
(N
) = N_Qualified_Expression
then
8398 return Is_Preelaborable_Expression
(Expression
(N
));
8400 -- For aggregates we have to check that each of the associations
8401 -- is preelaborable.
8403 elsif Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
) then
8404 Is_Array_Aggr
:= Is_Array_Type
(Etype
(N
));
8406 if Is_Array_Aggr
then
8407 Comp_Type
:= Component_Type
(Etype
(N
));
8410 -- Check the ancestor part of extension aggregates, which must
8411 -- be either the name of a type that has preelaborable init or
8412 -- an expression that is preelaborable.
8414 if Nkind
(N
) = N_Extension_Aggregate
then
8416 Anc_Part
: constant Node_Id
:= Ancestor_Part
(N
);
8419 if Is_Entity_Name
(Anc_Part
)
8420 and then Is_Type
(Entity
(Anc_Part
))
8422 if not Has_Preelaborable_Initialization
8428 elsif not Is_Preelaborable_Expression
(Anc_Part
) then
8434 -- Check positional associations
8436 Exp
:= First
(Expressions
(N
));
8437 while Present
(Exp
) loop
8438 if not Is_Preelaborable_Expression
(Exp
) then
8445 -- Check named associations
8447 Assn
:= First
(Component_Associations
(N
));
8448 while Present
(Assn
) loop
8449 Choice
:= First
(Choices
(Assn
));
8450 while Present
(Choice
) loop
8451 if Is_Array_Aggr
then
8452 if Nkind
(Choice
) = N_Others_Choice
then
8455 elsif Nkind
(Choice
) = N_Range
then
8456 if not Is_OK_Static_Range
(Choice
) then
8460 elsif not Is_OK_Static_Expression
(Choice
) then
8465 Comp_Type
:= Etype
(Choice
);
8471 -- If the association has a <> at this point, then we have
8472 -- to check whether the component's type has preelaborable
8473 -- initialization. Note that this only occurs when the
8474 -- association's corresponding component does not have a
8475 -- default expression, the latter case having already been
8476 -- expanded as an expression for the association.
8478 if Box_Present
(Assn
) then
8479 if not Has_Preelaborable_Initialization
(Comp_Type
) then
8483 -- In the expression case we check whether the expression
8484 -- is preelaborable.
8487 not Is_Preelaborable_Expression
(Expression
(Assn
))
8495 -- If we get here then aggregate as a whole is preelaborable
8499 -- All other cases are not preelaborable
8504 end Is_Preelaborable_Expression
;
8506 -- Start of processing for Check_Components
8509 -- Loop through entities of record or protected type
8512 while Present
(Ent
) loop
8514 -- We are interested only in components and discriminants
8521 -- Get default expression if any. If there is no declaration
8522 -- node, it means we have an internal entity. The parent and
8523 -- tag fields are examples of such entities. For such cases,
8524 -- we just test the type of the entity.
8526 if Present
(Declaration_Node
(Ent
)) then
8527 Exp
:= Expression
(Declaration_Node
(Ent
));
8530 when E_Discriminant
=>
8532 -- Note: for a renamed discriminant, the Declaration_Node
8533 -- may point to the one from the ancestor, and have a
8534 -- different expression, so use the proper attribute to
8535 -- retrieve the expression from the derived constraint.
8537 Exp
:= Discriminant_Default_Value
(Ent
);
8540 goto Check_Next_Entity
;
8543 -- A component has PI if it has no default expression and the
8544 -- component type has PI.
8547 if not Has_Preelaborable_Initialization
(Etype
(Ent
)) then
8552 -- Require the default expression to be preelaborable
8554 elsif not Is_Preelaborable_Expression
(Exp
) then
8559 <<Check_Next_Entity
>>
8562 end Check_Components
;
8564 -- Start of processing for Has_Preelaborable_Initialization
8567 -- Immediate return if already marked as known preelaborable init. This
8568 -- covers types for which this function has already been called once
8569 -- and returned True (in which case the result is cached), and also
8570 -- types to which a pragma Preelaborable_Initialization applies.
8572 if Known_To_Have_Preelab_Init
(E
) then
8576 -- If the type is a subtype representing a generic actual type, then
8577 -- test whether its base type has preelaborable initialization since
8578 -- the subtype representing the actual does not inherit this attribute
8579 -- from the actual or formal. (but maybe it should???)
8581 if Is_Generic_Actual_Type
(E
) then
8582 return Has_Preelaborable_Initialization
(Base_Type
(E
));
8585 -- All elementary types have preelaborable initialization
8587 if Is_Elementary_Type
(E
) then
8590 -- Array types have PI if the component type has PI
8592 elsif Is_Array_Type
(E
) then
8593 Has_PE
:= Has_Preelaborable_Initialization
(Component_Type
(E
));
8595 -- A derived type has preelaborable initialization if its parent type
8596 -- has preelaborable initialization and (in the case of a derived record
8597 -- extension) if the non-inherited components all have preelaborable
8598 -- initialization. However, a user-defined controlled type with an
8599 -- overriding Initialize procedure does not have preelaborable
8602 elsif Is_Derived_Type
(E
) then
8604 -- If the derived type is a private extension then it doesn't have
8605 -- preelaborable initialization.
8607 if Ekind
(Base_Type
(E
)) = E_Record_Type_With_Private
then
8611 -- First check whether ancestor type has preelaborable initialization
8613 Has_PE
:= Has_Preelaborable_Initialization
(Etype
(Base_Type
(E
)));
8615 -- If OK, check extension components (if any)
8617 if Has_PE
and then Is_Record_Type
(E
) then
8618 Check_Components
(First_Entity
(E
));
8621 -- Check specifically for 10.2.1(11.4/2) exception: a controlled type
8622 -- with a user defined Initialize procedure does not have PI. If
8623 -- the type is untagged, the control primitives come from a component
8624 -- that has already been checked.
8627 and then Is_Controlled
(E
)
8628 and then Is_Tagged_Type
(E
)
8629 and then Has_Overriding_Initialize
(E
)
8634 -- Private types not derived from a type having preelaborable init and
8635 -- that are not marked with pragma Preelaborable_Initialization do not
8636 -- have preelaborable initialization.
8638 elsif Is_Private_Type
(E
) then
8641 -- Record type has PI if it is non private and all components have PI
8643 elsif Is_Record_Type
(E
) then
8645 Check_Components
(First_Entity
(E
));
8647 -- Protected types must not have entries, and components must meet
8648 -- same set of rules as for record components.
8650 elsif Is_Protected_Type
(E
) then
8651 if Has_Entries
(E
) then
8655 Check_Components
(First_Entity
(E
));
8656 Check_Components
(First_Private_Entity
(E
));
8659 -- Type System.Address always has preelaborable initialization
8661 elsif Is_RTE
(E
, RE_Address
) then
8664 -- In all other cases, type does not have preelaborable initialization
8670 -- If type has preelaborable initialization, cache result
8673 Set_Known_To_Have_Preelab_Init
(E
);
8677 end Has_Preelaborable_Initialization
;
8679 ---------------------------
8680 -- Has_Private_Component --
8681 ---------------------------
8683 function Has_Private_Component
(Type_Id
: Entity_Id
) return Boolean is
8684 Btype
: Entity_Id
:= Base_Type
(Type_Id
);
8685 Component
: Entity_Id
;
8688 if Error_Posted
(Type_Id
)
8689 or else Error_Posted
(Btype
)
8694 if Is_Class_Wide_Type
(Btype
) then
8695 Btype
:= Root_Type
(Btype
);
8698 if Is_Private_Type
(Btype
) then
8700 UT
: constant Entity_Id
:= Underlying_Type
(Btype
);
8703 if No
(Full_View
(Btype
)) then
8704 return not Is_Generic_Type
(Btype
)
8706 not Is_Generic_Type
(Root_Type
(Btype
));
8708 return not Is_Generic_Type
(Root_Type
(Full_View
(Btype
)));
8711 return not Is_Frozen
(UT
) and then Has_Private_Component
(UT
);
8715 elsif Is_Array_Type
(Btype
) then
8716 return Has_Private_Component
(Component_Type
(Btype
));
8718 elsif Is_Record_Type
(Btype
) then
8719 Component
:= First_Component
(Btype
);
8720 while Present
(Component
) loop
8721 if Has_Private_Component
(Etype
(Component
)) then
8725 Next_Component
(Component
);
8730 elsif Is_Protected_Type
(Btype
)
8731 and then Present
(Corresponding_Record_Type
(Btype
))
8733 return Has_Private_Component
(Corresponding_Record_Type
(Btype
));
8738 end Has_Private_Component
;
8740 ----------------------
8741 -- Has_Signed_Zeros --
8742 ----------------------
8744 function Has_Signed_Zeros
(E
: Entity_Id
) return Boolean is
8746 return Is_Floating_Point_Type
(E
) and then Signed_Zeros_On_Target
;
8747 end Has_Signed_Zeros
;
8749 -----------------------------
8750 -- Has_Static_Array_Bounds --
8751 -----------------------------
8753 function Has_Static_Array_Bounds
(Typ
: Node_Id
) return Boolean is
8754 Ndims
: constant Nat
:= Number_Dimensions
(Typ
);
8761 -- Unconstrained types do not have static bounds
8763 if not Is_Constrained
(Typ
) then
8767 -- First treat string literals specially, as the lower bound and length
8768 -- of string literals are not stored like those of arrays.
8770 -- A string literal always has static bounds
8772 if Ekind
(Typ
) = E_String_Literal_Subtype
then
8776 -- Treat all dimensions in turn
8778 Index
:= First_Index
(Typ
);
8779 for Indx
in 1 .. Ndims
loop
8781 -- In case of an illegal index which is not a discrete type, return
8782 -- that the type is not static.
8784 if not Is_Discrete_Type
(Etype
(Index
))
8785 or else Etype
(Index
) = Any_Type
8790 Get_Index_Bounds
(Index
, Low
, High
);
8792 if Error_Posted
(Low
) or else Error_Posted
(High
) then
8796 if Is_OK_Static_Expression
(Low
)
8798 Is_OK_Static_Expression
(High
)
8808 -- If we fall through the loop, all indexes matched
8811 end Has_Static_Array_Bounds
;
8817 function Has_Stream
(T
: Entity_Id
) return Boolean is
8824 elsif Is_RTE
(Root_Type
(T
), RE_Root_Stream_Type
) then
8827 elsif Is_Array_Type
(T
) then
8828 return Has_Stream
(Component_Type
(T
));
8830 elsif Is_Record_Type
(T
) then
8831 E
:= First_Component
(T
);
8832 while Present
(E
) loop
8833 if Has_Stream
(Etype
(E
)) then
8842 elsif Is_Private_Type
(T
) then
8843 return Has_Stream
(Underlying_Type
(T
));
8854 function Has_Suffix
(E
: Entity_Id
; Suffix
: Character) return Boolean is
8856 Get_Name_String
(Chars
(E
));
8857 return Name_Buffer
(Name_Len
) = Suffix
;
8864 function Add_Suffix
(E
: Entity_Id
; Suffix
: Character) return Name_Id
is
8866 Get_Name_String
(Chars
(E
));
8867 Add_Char_To_Name_Buffer
(Suffix
);
8875 function Remove_Suffix
(E
: Entity_Id
; Suffix
: Character) return Name_Id
is
8877 pragma Assert
(Has_Suffix
(E
, Suffix
));
8878 Get_Name_String
(Chars
(E
));
8879 Name_Len
:= Name_Len
- 1;
8883 --------------------------
8884 -- Has_Tagged_Component --
8885 --------------------------
8887 function Has_Tagged_Component
(Typ
: Entity_Id
) return Boolean is
8891 if Is_Private_Type
(Typ
) and then Present
(Underlying_Type
(Typ
)) then
8892 return Has_Tagged_Component
(Underlying_Type
(Typ
));
8894 elsif Is_Array_Type
(Typ
) then
8895 return Has_Tagged_Component
(Component_Type
(Typ
));
8897 elsif Is_Tagged_Type
(Typ
) then
8900 elsif Is_Record_Type
(Typ
) then
8901 Comp
:= First_Component
(Typ
);
8902 while Present
(Comp
) loop
8903 if Has_Tagged_Component
(Etype
(Comp
)) then
8907 Next_Component
(Comp
);
8915 end Has_Tagged_Component
;
8917 ----------------------------
8918 -- Has_Volatile_Component --
8919 ----------------------------
8921 function Has_Volatile_Component
(Typ
: Entity_Id
) return Boolean is
8925 if Has_Volatile_Components
(Typ
) then
8928 elsif Is_Array_Type
(Typ
) then
8929 return Is_Volatile
(Component_Type
(Typ
));
8931 elsif Is_Record_Type
(Typ
) then
8932 Comp
:= First_Component
(Typ
);
8933 while Present
(Comp
) loop
8934 if Is_Volatile_Object
(Comp
) then
8938 Comp
:= Next_Component
(Comp
);
8943 end Has_Volatile_Component
;
8945 -------------------------
8946 -- Implementation_Kind --
8947 -------------------------
8949 function Implementation_Kind
(Subp
: Entity_Id
) return Name_Id
is
8950 Impl_Prag
: constant Node_Id
:= Get_Rep_Pragma
(Subp
, Name_Implemented
);
8953 pragma Assert
(Present
(Impl_Prag
));
8954 Arg
:= Last
(Pragma_Argument_Associations
(Impl_Prag
));
8955 return Chars
(Get_Pragma_Arg
(Arg
));
8956 end Implementation_Kind
;
8958 --------------------------
8959 -- Implements_Interface --
8960 --------------------------
8962 function Implements_Interface
8963 (Typ_Ent
: Entity_Id
;
8964 Iface_Ent
: Entity_Id
;
8965 Exclude_Parents
: Boolean := False) return Boolean
8967 Ifaces_List
: Elist_Id
;
8969 Iface
: Entity_Id
:= Base_Type
(Iface_Ent
);
8970 Typ
: Entity_Id
:= Base_Type
(Typ_Ent
);
8973 if Is_Class_Wide_Type
(Typ
) then
8974 Typ
:= Root_Type
(Typ
);
8977 if not Has_Interfaces
(Typ
) then
8981 if Is_Class_Wide_Type
(Iface
) then
8982 Iface
:= Root_Type
(Iface
);
8985 Collect_Interfaces
(Typ
, Ifaces_List
);
8987 Elmt
:= First_Elmt
(Ifaces_List
);
8988 while Present
(Elmt
) loop
8989 if Is_Ancestor
(Node
(Elmt
), Typ
, Use_Full_View
=> True)
8990 and then Exclude_Parents
8994 elsif Node
(Elmt
) = Iface
then
9002 end Implements_Interface
;
9004 ------------------------------------
9005 -- In_Assertion_Expression_Pragma --
9006 ------------------------------------
9008 function In_Assertion_Expression_Pragma
(N
: Node_Id
) return Boolean is
9010 Prag
: Node_Id
:= Empty
;
9013 -- Climb the parent chain looking for an enclosing pragma
9016 while Present
(Par
) loop
9017 if Nkind
(Par
) = N_Pragma
then
9021 -- Precondition-like pragmas are expanded into if statements, check
9022 -- the original node instead.
9024 elsif Nkind
(Original_Node
(Par
)) = N_Pragma
then
9025 Prag
:= Original_Node
(Par
);
9028 -- The expansion of attribute 'Old generates a constant to capture
9029 -- the result of the prefix. If the parent traversal reaches
9030 -- one of these constants, then the node technically came from a
9031 -- postcondition-like pragma. Note that the Ekind is not tested here
9032 -- because N may be the expression of an object declaration which is
9033 -- currently being analyzed. Such objects carry Ekind of E_Void.
9035 elsif Nkind
(Par
) = N_Object_Declaration
9036 and then Constant_Present
(Par
)
9037 and then Stores_Attribute_Old_Prefix
(Defining_Entity
(Par
))
9041 -- Prevent the search from going too far
9043 elsif Is_Body_Or_Package_Declaration
(Par
) then
9047 Par
:= Parent
(Par
);
9052 and then Assertion_Expression_Pragma
(Get_Pragma_Id
(Prag
));
9053 end In_Assertion_Expression_Pragma
;
9059 function In_Instance
return Boolean is
9060 Curr_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
9065 while Present
(S
) and then S
/= Standard_Standard
loop
9066 if Ekind_In
(S
, E_Function
, E_Package
, E_Procedure
)
9067 and then Is_Generic_Instance
(S
)
9069 -- A child instance is always compiled in the context of a parent
9070 -- instance. Nevertheless, the actuals are not analyzed in an
9071 -- instance context. We detect this case by examining the current
9072 -- compilation unit, which must be a child instance, and checking
9073 -- that it is not currently on the scope stack.
9075 if Is_Child_Unit
(Curr_Unit
)
9076 and then Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) =
9077 N_Package_Instantiation
9078 and then not In_Open_Scopes
(Curr_Unit
)
9092 ----------------------
9093 -- In_Instance_Body --
9094 ----------------------
9096 function In_Instance_Body
return Boolean is
9101 while Present
(S
) and then S
/= Standard_Standard
loop
9102 if Ekind_In
(S
, E_Function
, E_Procedure
)
9103 and then Is_Generic_Instance
(S
)
9107 elsif Ekind
(S
) = E_Package
9108 and then In_Package_Body
(S
)
9109 and then Is_Generic_Instance
(S
)
9118 end In_Instance_Body
;
9120 -----------------------------
9121 -- In_Instance_Not_Visible --
9122 -----------------------------
9124 function In_Instance_Not_Visible
return Boolean is
9129 while Present
(S
) and then S
/= Standard_Standard
loop
9130 if Ekind_In
(S
, E_Function
, E_Procedure
)
9131 and then Is_Generic_Instance
(S
)
9135 elsif Ekind
(S
) = E_Package
9136 and then (In_Package_Body
(S
) or else In_Private_Part
(S
))
9137 and then Is_Generic_Instance
(S
)
9146 end In_Instance_Not_Visible
;
9148 ------------------------------
9149 -- In_Instance_Visible_Part --
9150 ------------------------------
9152 function In_Instance_Visible_Part
return Boolean is
9157 while Present
(S
) and then S
/= Standard_Standard
loop
9158 if Ekind
(S
) = E_Package
9159 and then Is_Generic_Instance
(S
)
9160 and then not In_Package_Body
(S
)
9161 and then not In_Private_Part
(S
)
9170 end In_Instance_Visible_Part
;
9172 ---------------------
9173 -- In_Package_Body --
9174 ---------------------
9176 function In_Package_Body
return Boolean is
9181 while Present
(S
) and then S
/= Standard_Standard
loop
9182 if Ekind
(S
) = E_Package
and then In_Package_Body
(S
) then
9190 end In_Package_Body
;
9192 --------------------------------
9193 -- In_Parameter_Specification --
9194 --------------------------------
9196 function In_Parameter_Specification
(N
: Node_Id
) return Boolean is
9201 while Present
(PN
) loop
9202 if Nkind
(PN
) = N_Parameter_Specification
then
9210 end In_Parameter_Specification
;
9212 --------------------------
9213 -- In_Pragma_Expression --
9214 --------------------------
9216 function In_Pragma_Expression
(N
: Node_Id
; Nam
: Name_Id
) return Boolean is
9223 elsif Nkind
(P
) = N_Pragma
and then Pragma_Name
(P
) = Nam
then
9229 end In_Pragma_Expression
;
9231 -------------------------------------
9232 -- In_Reverse_Storage_Order_Object --
9233 -------------------------------------
9235 function In_Reverse_Storage_Order_Object
(N
: Node_Id
) return Boolean is
9237 Btyp
: Entity_Id
:= Empty
;
9240 -- Climb up indexed components
9244 case Nkind
(Pref
) is
9245 when N_Selected_Component
=>
9246 Pref
:= Prefix
(Pref
);
9249 when N_Indexed_Component
=>
9250 Pref
:= Prefix
(Pref
);
9258 if Present
(Pref
) then
9259 Btyp
:= Base_Type
(Etype
(Pref
));
9262 return Present
(Btyp
)
9263 and then (Is_Record_Type
(Btyp
) or else Is_Array_Type
(Btyp
))
9264 and then Reverse_Storage_Order
(Btyp
);
9265 end In_Reverse_Storage_Order_Object
;
9267 --------------------------------------
9268 -- In_Subprogram_Or_Concurrent_Unit --
9269 --------------------------------------
9271 function In_Subprogram_Or_Concurrent_Unit
return Boolean is
9276 -- Use scope chain to check successively outer scopes
9282 if K
in Subprogram_Kind
9283 or else K
in Concurrent_Kind
9284 or else K
in Generic_Subprogram_Kind
9288 elsif E
= Standard_Standard
then
9294 end In_Subprogram_Or_Concurrent_Unit
;
9296 ---------------------
9297 -- In_Visible_Part --
9298 ---------------------
9300 function In_Visible_Part
(Scope_Id
: Entity_Id
) return Boolean is
9302 return Is_Package_Or_Generic_Package
(Scope_Id
)
9303 and then In_Open_Scopes
(Scope_Id
)
9304 and then not In_Package_Body
(Scope_Id
)
9305 and then not In_Private_Part
(Scope_Id
);
9306 end In_Visible_Part
;
9308 --------------------------------
9309 -- Incomplete_Or_Private_View --
9310 --------------------------------
9312 function Incomplete_Or_Private_View
(Typ
: Entity_Id
) return Entity_Id
is
9313 function Inspect_Decls
9315 Taft
: Boolean := False) return Entity_Id
;
9316 -- Check whether a declarative region contains the incomplete or private
9323 function Inspect_Decls
9325 Taft
: Boolean := False) return Entity_Id
9331 Decl
:= First
(Decls
);
9332 while Present
(Decl
) loop
9336 if Nkind
(Decl
) = N_Incomplete_Type_Declaration
then
9337 Match
:= Defining_Identifier
(Decl
);
9341 if Nkind_In
(Decl
, N_Private_Extension_Declaration
,
9342 N_Private_Type_Declaration
)
9344 Match
:= Defining_Identifier
(Decl
);
9349 and then Present
(Full_View
(Match
))
9350 and then Full_View
(Match
) = Typ
9365 -- Start of processing for Incomplete_Or_Partial_View
9368 -- Incomplete type case
9370 Prev
:= Current_Entity_In_Scope
(Typ
);
9373 and then Is_Incomplete_Type
(Prev
)
9374 and then Present
(Full_View
(Prev
))
9375 and then Full_View
(Prev
) = Typ
9380 -- Private or Taft amendment type case
9383 Pkg
: constant Entity_Id
:= Scope
(Typ
);
9384 Pkg_Decl
: Node_Id
:= Pkg
;
9387 if Ekind
(Pkg
) = E_Package
then
9388 while Nkind
(Pkg_Decl
) /= N_Package_Specification
loop
9389 Pkg_Decl
:= Parent
(Pkg_Decl
);
9392 -- It is knows that Typ has a private view, look for it in the
9393 -- visible declarations of the enclosing scope. A special case
9394 -- of this is when the two views have been exchanged - the full
9395 -- appears earlier than the private.
9397 if Has_Private_Declaration
(Typ
) then
9398 Prev
:= Inspect_Decls
(Visible_Declarations
(Pkg_Decl
));
9400 -- Exchanged view case, look in the private declarations
9403 Prev
:= Inspect_Decls
(Private_Declarations
(Pkg_Decl
));
9408 -- Otherwise if this is the package body, then Typ is a potential
9409 -- Taft amendment type. The incomplete view should be located in
9410 -- the private declarations of the enclosing scope.
9412 elsif In_Package_Body
(Pkg
) then
9413 return Inspect_Decls
(Private_Declarations
(Pkg_Decl
), True);
9418 -- The type has no incomplete or private view
9421 end Incomplete_Or_Private_View
;
9423 -----------------------------------------
9424 -- Inherit_Default_Init_Cond_Procedure --
9425 -----------------------------------------
9427 procedure Inherit_Default_Init_Cond_Procedure
(Typ
: Entity_Id
) is
9428 Par_Typ
: constant Entity_Id
:= Etype
(Typ
);
9431 -- A derived type inherits the default initial condition procedure of
9434 if No
(Default_Init_Cond_Procedure
(Typ
)) then
9435 Set_Default_Init_Cond_Procedure
9436 (Typ
, Default_Init_Cond_Procedure
(Par_Typ
));
9438 end Inherit_Default_Init_Cond_Procedure
;
9440 ----------------------------
9441 -- Inherit_Rep_Item_Chain --
9442 ----------------------------
9444 procedure Inherit_Rep_Item_Chain
(Typ
: Entity_Id
; From_Typ
: Entity_Id
) is
9445 From_Item
: constant Node_Id
:= First_Rep_Item
(From_Typ
);
9446 Item
: Node_Id
:= Empty
;
9447 Last_Item
: Node_Id
:= Empty
;
9450 -- Reach the end of the destination type's chain (if any) and capture
9453 Item
:= First_Rep_Item
(Typ
);
9454 while Present
(Item
) loop
9456 -- Do not inherit a chain that has been inherited already
9458 if Item
= From_Item
then
9463 Item
:= Next_Rep_Item
(Item
);
9466 -- When the destination type has a rep item chain, the chain of the
9467 -- source type is appended to it.
9469 if Present
(Last_Item
) then
9470 Set_Next_Rep_Item
(Last_Item
, From_Item
);
9472 -- Otherwise the destination type directly inherits the rep item chain
9473 -- of the source type (if any).
9476 Set_First_Rep_Item
(Typ
, From_Item
);
9478 end Inherit_Rep_Item_Chain
;
9480 ---------------------------------
9481 -- Inherit_Subprogram_Contract --
9482 ---------------------------------
9484 procedure Inherit_Subprogram_Contract
9486 From_Subp
: Entity_Id
)
9488 procedure Inherit_Pragma
(Prag_Id
: Pragma_Id
);
9489 -- Propagate a pragma denoted by Prag_Id from From_Subp's contract to
9492 --------------------
9493 -- Inherit_Pragma --
9494 --------------------
9496 procedure Inherit_Pragma
(Prag_Id
: Pragma_Id
) is
9497 Prag
: constant Node_Id
:= Get_Pragma
(From_Subp
, Prag_Id
);
9501 -- A pragma cannot be part of more than one First_Pragma/Next_Pragma
9502 -- chains, therefore the node must be replicated. The new pragma is
9503 -- flagged is inherited for distrinction purposes.
9505 if Present
(Prag
) then
9506 New_Prag
:= New_Copy_Tree
(Prag
);
9507 Set_Is_Inherited
(New_Prag
);
9509 Add_Contract_Item
(New_Prag
, Subp
);
9513 -- Start of processing for Inherit_Subprogram_Contract
9516 -- Inheritance is carried out only when both entities are subprograms
9519 if Is_Subprogram_Or_Generic_Subprogram
(Subp
)
9520 and then Is_Subprogram_Or_Generic_Subprogram
(From_Subp
)
9521 and then Present
(Contract
(Subp
))
9522 and then Present
(Contract
(From_Subp
))
9524 Inherit_Pragma
(Pragma_Extensions_Visible
);
9526 end Inherit_Subprogram_Contract
;
9528 ---------------------------------
9529 -- Insert_Explicit_Dereference --
9530 ---------------------------------
9532 procedure Insert_Explicit_Dereference
(N
: Node_Id
) is
9533 New_Prefix
: constant Node_Id
:= Relocate_Node
(N
);
9534 Ent
: Entity_Id
:= Empty
;
9541 Save_Interps
(N
, New_Prefix
);
9544 Make_Explicit_Dereference
(Sloc
(Parent
(N
)),
9545 Prefix
=> New_Prefix
));
9547 Set_Etype
(N
, Designated_Type
(Etype
(New_Prefix
)));
9549 if Is_Overloaded
(New_Prefix
) then
9551 -- The dereference is also overloaded, and its interpretations are
9552 -- the designated types of the interpretations of the original node.
9554 Set_Etype
(N
, Any_Type
);
9556 Get_First_Interp
(New_Prefix
, I
, It
);
9557 while Present
(It
.Nam
) loop
9560 if Is_Access_Type
(T
) then
9561 Add_One_Interp
(N
, Designated_Type
(T
), Designated_Type
(T
));
9564 Get_Next_Interp
(I
, It
);
9570 -- Prefix is unambiguous: mark the original prefix (which might
9571 -- Come_From_Source) as a reference, since the new (relocated) one
9572 -- won't be taken into account.
9574 if Is_Entity_Name
(New_Prefix
) then
9575 Ent
:= Entity
(New_Prefix
);
9578 -- For a retrieval of a subcomponent of some composite object,
9579 -- retrieve the ultimate entity if there is one.
9581 elsif Nkind_In
(New_Prefix
, N_Selected_Component
,
9582 N_Indexed_Component
)
9584 Pref
:= Prefix
(New_Prefix
);
9585 while Present
(Pref
)
9586 and then Nkind_In
(Pref
, N_Selected_Component
,
9587 N_Indexed_Component
)
9589 Pref
:= Prefix
(Pref
);
9592 if Present
(Pref
) and then Is_Entity_Name
(Pref
) then
9593 Ent
:= Entity
(Pref
);
9597 -- Place the reference on the entity node
9599 if Present
(Ent
) then
9600 Generate_Reference
(Ent
, Pref
);
9603 end Insert_Explicit_Dereference
;
9605 ------------------------------------------
9606 -- Inspect_Deferred_Constant_Completion --
9607 ------------------------------------------
9609 procedure Inspect_Deferred_Constant_Completion
(Decls
: List_Id
) is
9613 Decl
:= First
(Decls
);
9614 while Present
(Decl
) loop
9616 -- Deferred constant signature
9618 if Nkind
(Decl
) = N_Object_Declaration
9619 and then Constant_Present
(Decl
)
9620 and then No
(Expression
(Decl
))
9622 -- No need to check internally generated constants
9624 and then Comes_From_Source
(Decl
)
9626 -- The constant is not completed. A full object declaration or a
9627 -- pragma Import complete a deferred constant.
9629 and then not Has_Completion
(Defining_Identifier
(Decl
))
9632 ("constant declaration requires initialization expression",
9633 Defining_Identifier
(Decl
));
9636 Decl
:= Next
(Decl
);
9638 end Inspect_Deferred_Constant_Completion
;
9640 -----------------------------
9641 -- Is_Actual_Out_Parameter --
9642 -----------------------------
9644 function Is_Actual_Out_Parameter
(N
: Node_Id
) return Boolean is
9648 Find_Actual
(N
, Formal
, Call
);
9649 return Present
(Formal
) and then Ekind
(Formal
) = E_Out_Parameter
;
9650 end Is_Actual_Out_Parameter
;
9652 -------------------------
9653 -- Is_Actual_Parameter --
9654 -------------------------
9656 function Is_Actual_Parameter
(N
: Node_Id
) return Boolean is
9657 PK
: constant Node_Kind
:= Nkind
(Parent
(N
));
9661 when N_Parameter_Association
=>
9662 return N
= Explicit_Actual_Parameter
(Parent
(N
));
9664 when N_Subprogram_Call
=>
9665 return Is_List_Member
(N
)
9667 List_Containing
(N
) = Parameter_Associations
(Parent
(N
));
9672 end Is_Actual_Parameter
;
9674 --------------------------------
9675 -- Is_Actual_Tagged_Parameter --
9676 --------------------------------
9678 function Is_Actual_Tagged_Parameter
(N
: Node_Id
) return Boolean is
9682 Find_Actual
(N
, Formal
, Call
);
9683 return Present
(Formal
) and then Is_Tagged_Type
(Etype
(Formal
));
9684 end Is_Actual_Tagged_Parameter
;
9686 ---------------------
9687 -- Is_Aliased_View --
9688 ---------------------
9690 function Is_Aliased_View
(Obj
: Node_Id
) return Boolean is
9694 if Is_Entity_Name
(Obj
) then
9701 or else (Present
(Renamed_Object
(E
))
9702 and then Is_Aliased_View
(Renamed_Object
(E
)))))
9704 or else ((Is_Formal
(E
)
9705 or else Ekind_In
(E
, E_Generic_In_Out_Parameter
,
9706 E_Generic_In_Parameter
))
9707 and then Is_Tagged_Type
(Etype
(E
)))
9709 or else (Is_Concurrent_Type
(E
) and then In_Open_Scopes
(E
))
9711 -- Current instance of type, either directly or as rewritten
9712 -- reference to the current object.
9714 or else (Is_Entity_Name
(Original_Node
(Obj
))
9715 and then Present
(Entity
(Original_Node
(Obj
)))
9716 and then Is_Type
(Entity
(Original_Node
(Obj
))))
9718 or else (Is_Type
(E
) and then E
= Current_Scope
)
9720 or else (Is_Incomplete_Or_Private_Type
(E
)
9721 and then Full_View
(E
) = Current_Scope
)
9723 -- Ada 2012 AI05-0053: the return object of an extended return
9724 -- statement is aliased if its type is immutably limited.
9726 or else (Is_Return_Object
(E
)
9727 and then Is_Limited_View
(Etype
(E
)));
9729 elsif Nkind
(Obj
) = N_Selected_Component
then
9730 return Is_Aliased
(Entity
(Selector_Name
(Obj
)));
9732 elsif Nkind
(Obj
) = N_Indexed_Component
then
9733 return Has_Aliased_Components
(Etype
(Prefix
(Obj
)))
9735 (Is_Access_Type
(Etype
(Prefix
(Obj
)))
9736 and then Has_Aliased_Components
9737 (Designated_Type
(Etype
(Prefix
(Obj
)))));
9739 elsif Nkind_In
(Obj
, N_Unchecked_Type_Conversion
, N_Type_Conversion
) then
9740 return Is_Tagged_Type
(Etype
(Obj
))
9741 and then Is_Aliased_View
(Expression
(Obj
));
9743 elsif Nkind
(Obj
) = N_Explicit_Dereference
then
9744 return Nkind
(Original_Node
(Obj
)) /= N_Function_Call
;
9749 end Is_Aliased_View
;
9751 -------------------------
9752 -- Is_Ancestor_Package --
9753 -------------------------
9755 function Is_Ancestor_Package
9757 E2
: Entity_Id
) return Boolean
9763 while Present
(Par
) and then Par
/= Standard_Standard
loop
9772 end Is_Ancestor_Package
;
9774 ----------------------
9775 -- Is_Atomic_Object --
9776 ----------------------
9778 function Is_Atomic_Object
(N
: Node_Id
) return Boolean is
9780 function Object_Has_Atomic_Components
(N
: Node_Id
) return Boolean;
9781 -- Determines if given object has atomic components
9783 function Is_Atomic_Prefix
(N
: Node_Id
) return Boolean;
9784 -- If prefix is an implicit dereference, examine designated type
9786 ----------------------
9787 -- Is_Atomic_Prefix --
9788 ----------------------
9790 function Is_Atomic_Prefix
(N
: Node_Id
) return Boolean is
9792 if Is_Access_Type
(Etype
(N
)) then
9794 Has_Atomic_Components
(Designated_Type
(Etype
(N
)));
9796 return Object_Has_Atomic_Components
(N
);
9798 end Is_Atomic_Prefix
;
9800 ----------------------------------
9801 -- Object_Has_Atomic_Components --
9802 ----------------------------------
9804 function Object_Has_Atomic_Components
(N
: Node_Id
) return Boolean is
9806 if Has_Atomic_Components
(Etype
(N
))
9807 or else Is_Atomic
(Etype
(N
))
9811 elsif Is_Entity_Name
(N
)
9812 and then (Has_Atomic_Components
(Entity
(N
))
9813 or else Is_Atomic
(Entity
(N
)))
9817 elsif Nkind
(N
) = N_Selected_Component
9818 and then Is_Atomic
(Entity
(Selector_Name
(N
)))
9822 elsif Nkind
(N
) = N_Indexed_Component
9823 or else Nkind
(N
) = N_Selected_Component
9825 return Is_Atomic_Prefix
(Prefix
(N
));
9830 end Object_Has_Atomic_Components
;
9832 -- Start of processing for Is_Atomic_Object
9835 -- Predicate is not relevant to subprograms
9837 if Is_Entity_Name
(N
) and then Is_Overloadable
(Entity
(N
)) then
9840 elsif Is_Atomic
(Etype
(N
))
9841 or else (Is_Entity_Name
(N
) and then Is_Atomic
(Entity
(N
)))
9845 elsif Nkind
(N
) = N_Selected_Component
9846 and then Is_Atomic
(Entity
(Selector_Name
(N
)))
9850 elsif Nkind
(N
) = N_Indexed_Component
9851 or else Nkind
(N
) = N_Selected_Component
9853 return Is_Atomic_Prefix
(Prefix
(N
));
9858 end Is_Atomic_Object
;
9860 -------------------------
9861 -- Is_Attribute_Result --
9862 -------------------------
9864 function Is_Attribute_Result
(N
: Node_Id
) return Boolean is
9866 return Nkind
(N
) = N_Attribute_Reference
9867 and then Attribute_Name
(N
) = Name_Result
;
9868 end Is_Attribute_Result
;
9870 ------------------------------------
9871 -- Is_Body_Or_Package_Declaration --
9872 ------------------------------------
9874 function Is_Body_Or_Package_Declaration
(N
: Node_Id
) return Boolean is
9876 return Nkind_In
(N
, N_Entry_Body
,
9878 N_Package_Declaration
,
9882 end Is_Body_Or_Package_Declaration
;
9884 -----------------------
9885 -- Is_Bounded_String --
9886 -----------------------
9888 function Is_Bounded_String
(T
: Entity_Id
) return Boolean is
9889 Under
: constant Entity_Id
:= Underlying_Type
(Root_Type
(T
));
9892 -- Check whether T is ultimately derived from Ada.Strings.Superbounded.
9893 -- Super_String, or one of the [Wide_]Wide_ versions. This will
9894 -- be True for all the Bounded_String types in instances of the
9895 -- Generic_Bounded_Length generics, and for types derived from those.
9897 return Present
(Under
)
9898 and then (Is_RTE
(Root_Type
(Under
), RO_SU_Super_String
) or else
9899 Is_RTE
(Root_Type
(Under
), RO_WI_Super_String
) or else
9900 Is_RTE
(Root_Type
(Under
), RO_WW_Super_String
));
9901 end Is_Bounded_String
;
9903 -------------------------
9904 -- Is_Child_Or_Sibling --
9905 -------------------------
9907 function Is_Child_Or_Sibling
9908 (Pack_1
: Entity_Id
;
9909 Pack_2
: Entity_Id
) return Boolean
9911 function Distance_From_Standard
(Pack
: Entity_Id
) return Nat
;
9912 -- Given an arbitrary package, return the number of "climbs" necessary
9913 -- to reach scope Standard_Standard.
9915 procedure Equalize_Depths
9916 (Pack
: in out Entity_Id
;
9918 Depth_To_Reach
: Nat
);
9919 -- Given an arbitrary package, its depth and a target depth to reach,
9920 -- climb the scope chain until the said depth is reached. The pointer
9921 -- to the package and its depth a modified during the climb.
9923 ----------------------------
9924 -- Distance_From_Standard --
9925 ----------------------------
9927 function Distance_From_Standard
(Pack
: Entity_Id
) return Nat
is
9934 while Present
(Scop
) and then Scop
/= Standard_Standard
loop
9936 Scop
:= Scope
(Scop
);
9940 end Distance_From_Standard
;
9942 ---------------------
9943 -- Equalize_Depths --
9944 ---------------------
9946 procedure Equalize_Depths
9947 (Pack
: in out Entity_Id
;
9949 Depth_To_Reach
: Nat
)
9952 -- The package must be at a greater or equal depth
9954 if Depth
< Depth_To_Reach
then
9955 raise Program_Error
;
9958 -- Climb the scope chain until the desired depth is reached
9960 while Present
(Pack
) and then Depth
/= Depth_To_Reach
loop
9961 Pack
:= Scope
(Pack
);
9964 end Equalize_Depths
;
9968 P_1
: Entity_Id
:= Pack_1
;
9969 P_1_Child
: Boolean := False;
9970 P_1_Depth
: Nat
:= Distance_From_Standard
(P_1
);
9971 P_2
: Entity_Id
:= Pack_2
;
9972 P_2_Child
: Boolean := False;
9973 P_2_Depth
: Nat
:= Distance_From_Standard
(P_2
);
9975 -- Start of processing for Is_Child_Or_Sibling
9979 (Ekind
(Pack_1
) = E_Package
and then Ekind
(Pack_2
) = E_Package
);
9981 -- Both packages denote the same entity, therefore they cannot be
9982 -- children or siblings.
9987 -- One of the packages is at a deeper level than the other. Note that
9988 -- both may still come from differen hierarchies.
9996 elsif P_1_Depth
> P_2_Depth
then
10000 Depth_To_Reach
=> P_2_Depth
);
10009 elsif P_2_Depth
> P_1_Depth
then
10012 Depth
=> P_2_Depth
,
10013 Depth_To_Reach
=> P_1_Depth
);
10017 -- At this stage the package pointers have been elevated to the same
10018 -- depth. If the related entities are the same, then one package is a
10019 -- potential child of the other:
10023 -- X became P_1 P_2 or vica versa
10029 return Is_Child_Unit
(Pack_1
);
10031 else pragma Assert
(P_2_Child
);
10032 return Is_Child_Unit
(Pack_2
);
10035 -- The packages may come from the same package chain or from entirely
10036 -- different hierarcies. To determine this, climb the scope stack until
10037 -- a common root is found.
10039 -- (root) (root 1) (root 2)
10044 while Present
(P_1
) and then Present
(P_2
) loop
10046 -- The two packages may be siblings
10049 return Is_Child_Unit
(Pack_1
) and then Is_Child_Unit
(Pack_2
);
10052 P_1
:= Scope
(P_1
);
10053 P_2
:= Scope
(P_2
);
10058 end Is_Child_Or_Sibling
;
10060 -----------------------------
10061 -- Is_Concurrent_Interface --
10062 -----------------------------
10064 function Is_Concurrent_Interface
(T
: Entity_Id
) return Boolean is
10066 return Is_Interface
(T
)
10068 (Is_Protected_Interface
(T
)
10069 or else Is_Synchronized_Interface
(T
)
10070 or else Is_Task_Interface
(T
));
10071 end Is_Concurrent_Interface
;
10073 ---------------------------
10074 -- Is_Container_Element --
10075 ---------------------------
10077 function Is_Container_Element
(Exp
: Node_Id
) return Boolean is
10078 Loc
: constant Source_Ptr
:= Sloc
(Exp
);
10079 Pref
: constant Node_Id
:= Prefix
(Exp
);
10082 -- Call to an indexing aspect
10084 Cont_Typ
: Entity_Id
;
10085 -- The type of the container being accessed
10087 Elem_Typ
: Entity_Id
;
10088 -- Its element type
10090 Indexing
: Entity_Id
;
10091 Is_Const
: Boolean;
10092 -- Indicates that constant indexing is used, and the element is thus
10095 Ref_Typ
: Entity_Id
;
10096 -- The reference type returned by the indexing operation
10099 -- If C is a container, in a context that imposes the element type of
10100 -- that container, the indexing notation C (X) is rewritten as:
10102 -- Indexing (C, X).Discr.all
10104 -- where Indexing is one of the indexing aspects of the container.
10105 -- If the context does not require a reference, the construct can be
10110 -- First, verify that the construct has the proper form
10112 if not Expander_Active
then
10115 elsif Nkind
(Pref
) /= N_Selected_Component
then
10118 elsif Nkind
(Prefix
(Pref
)) /= N_Function_Call
then
10122 Call
:= Prefix
(Pref
);
10123 Ref_Typ
:= Etype
(Call
);
10126 if not Has_Implicit_Dereference
(Ref_Typ
)
10127 or else No
(First
(Parameter_Associations
(Call
)))
10128 or else not Is_Entity_Name
(Name
(Call
))
10133 -- Retrieve type of container object, and its iterator aspects
10135 Cont_Typ
:= Etype
(First
(Parameter_Associations
(Call
)));
10136 Indexing
:= Find_Value_Of_Aspect
(Cont_Typ
, Aspect_Constant_Indexing
);
10139 if No
(Indexing
) then
10141 -- Container should have at least one indexing operation
10145 elsif Entity
(Name
(Call
)) /= Entity
(Indexing
) then
10147 -- This may be a variable indexing operation
10149 Indexing
:= Find_Value_Of_Aspect
(Cont_Typ
, Aspect_Variable_Indexing
);
10152 or else Entity
(Name
(Call
)) /= Entity
(Indexing
)
10161 Elem_Typ
:= Find_Value_Of_Aspect
(Cont_Typ
, Aspect_Iterator_Element
);
10163 if No
(Elem_Typ
) or else Entity
(Elem_Typ
) /= Etype
(Exp
) then
10167 -- Check that the expression is not the target of an assignment, in
10168 -- which case the rewriting is not possible.
10170 if not Is_Const
then
10176 while Present
(Par
)
10178 if Nkind
(Parent
(Par
)) = N_Assignment_Statement
10179 and then Par
= Name
(Parent
(Par
))
10183 -- A renaming produces a reference, and the transformation
10186 elsif Nkind
(Parent
(Par
)) = N_Object_Renaming_Declaration
then
10190 (Nkind
(Parent
(Par
)), N_Function_Call
,
10191 N_Procedure_Call_Statement
,
10192 N_Entry_Call_Statement
)
10194 -- Check that the element is not part of an actual for an
10195 -- in-out parameter.
10202 F
:= First_Formal
(Entity
(Name
(Parent
(Par
))));
10203 A
:= First
(Parameter_Associations
(Parent
(Par
)));
10204 while Present
(F
) loop
10205 if A
= Par
and then Ekind
(F
) /= E_In_Parameter
then
10214 -- E_In_Parameter in a call: element is not modified.
10219 Par
:= Parent
(Par
);
10224 -- The expression has the proper form and the context requires the
10225 -- element type. Retrieve the Element function of the container and
10226 -- rewrite the construct as a call to it.
10232 Op
:= First_Elmt
(Primitive_Operations
(Cont_Typ
));
10233 while Present
(Op
) loop
10234 exit when Chars
(Node
(Op
)) = Name_Element
;
10243 Make_Function_Call
(Loc
,
10244 Name
=> New_Occurrence_Of
(Node
(Op
), Loc
),
10245 Parameter_Associations
=> Parameter_Associations
(Call
)));
10246 Analyze_And_Resolve
(Exp
, Entity
(Elem_Typ
));
10250 end Is_Container_Element
;
10252 -----------------------
10253 -- Is_Constant_Bound --
10254 -----------------------
10256 function Is_Constant_Bound
(Exp
: Node_Id
) return Boolean is
10258 if Compile_Time_Known_Value
(Exp
) then
10261 elsif Is_Entity_Name
(Exp
) and then Present
(Entity
(Exp
)) then
10262 return Is_Constant_Object
(Entity
(Exp
))
10263 or else Ekind
(Entity
(Exp
)) = E_Enumeration_Literal
;
10265 elsif Nkind
(Exp
) in N_Binary_Op
then
10266 return Is_Constant_Bound
(Left_Opnd
(Exp
))
10267 and then Is_Constant_Bound
(Right_Opnd
(Exp
))
10268 and then Scope
(Entity
(Exp
)) = Standard_Standard
;
10273 end Is_Constant_Bound
;
10275 --------------------------------------
10276 -- Is_Controlling_Limited_Procedure --
10277 --------------------------------------
10279 function Is_Controlling_Limited_Procedure
10280 (Proc_Nam
: Entity_Id
) return Boolean
10282 Param_Typ
: Entity_Id
:= Empty
;
10285 if Ekind
(Proc_Nam
) = E_Procedure
10286 and then Present
(Parameter_Specifications
(Parent
(Proc_Nam
)))
10288 Param_Typ
:= Etype
(Parameter_Type
(First
(
10289 Parameter_Specifications
(Parent
(Proc_Nam
)))));
10291 -- In this case where an Itype was created, the procedure call has been
10294 elsif Present
(Associated_Node_For_Itype
(Proc_Nam
))
10295 and then Present
(Original_Node
(Associated_Node_For_Itype
(Proc_Nam
)))
10297 Present
(Parameter_Associations
10298 (Associated_Node_For_Itype
(Proc_Nam
)))
10301 Etype
(First
(Parameter_Associations
10302 (Associated_Node_For_Itype
(Proc_Nam
))));
10305 if Present
(Param_Typ
) then
10307 Is_Interface
(Param_Typ
)
10308 and then Is_Limited_Record
(Param_Typ
);
10312 end Is_Controlling_Limited_Procedure
;
10314 -----------------------------
10315 -- Is_CPP_Constructor_Call --
10316 -----------------------------
10318 function Is_CPP_Constructor_Call
(N
: Node_Id
) return Boolean is
10320 return Nkind
(N
) = N_Function_Call
10321 and then Is_CPP_Class
(Etype
(Etype
(N
)))
10322 and then Is_Constructor
(Entity
(Name
(N
)))
10323 and then Is_Imported
(Entity
(Name
(N
)));
10324 end Is_CPP_Constructor_Call
;
10330 function Is_Delegate
(T
: Entity_Id
) return Boolean is
10331 Desig_Type
: Entity_Id
;
10334 if VM_Target
/= CLI_Target
then
10338 -- Access-to-subprograms are delegates in CIL
10340 if Ekind
(T
) = E_Access_Subprogram_Type
then
10344 if not Is_Access_Type
(T
) then
10346 -- A delegate is a managed pointer. If no designated type is defined
10347 -- it means that it's not a delegate.
10352 Desig_Type
:= Etype
(Directly_Designated_Type
(T
));
10354 if not Is_Tagged_Type
(Desig_Type
) then
10358 -- Test if the type is inherited from [mscorlib]System.Delegate
10360 while Etype
(Desig_Type
) /= Desig_Type
loop
10361 if Chars
(Scope
(Desig_Type
)) /= No_Name
10362 and then Is_Imported
(Scope
(Desig_Type
))
10363 and then Get_Name_String
(Chars
(Scope
(Desig_Type
))) = "delegate"
10368 Desig_Type
:= Etype
(Desig_Type
);
10374 ----------------------------------------------
10375 -- Is_Dependent_Component_Of_Mutable_Object --
10376 ----------------------------------------------
10378 function Is_Dependent_Component_Of_Mutable_Object
10379 (Object
: Node_Id
) return Boolean
10381 function Is_Declared_Within_Variant
(Comp
: Entity_Id
) return Boolean;
10382 -- Returns True if and only if Comp is declared within a variant part
10384 --------------------------------
10385 -- Is_Declared_Within_Variant --
10386 --------------------------------
10388 function Is_Declared_Within_Variant
(Comp
: Entity_Id
) return Boolean is
10389 Comp_Decl
: constant Node_Id
:= Parent
(Comp
);
10390 Comp_List
: constant Node_Id
:= Parent
(Comp_Decl
);
10392 return Nkind
(Parent
(Comp_List
)) = N_Variant
;
10393 end Is_Declared_Within_Variant
;
10396 Prefix_Type
: Entity_Id
;
10397 P_Aliased
: Boolean := False;
10400 Deref
: Node_Id
:= Object
;
10401 -- Dereference node, in something like X.all.Y(2)
10403 -- Start of processing for Is_Dependent_Component_Of_Mutable_Object
10406 -- Find the dereference node if any
10408 while Nkind_In
(Deref
, N_Indexed_Component
,
10409 N_Selected_Component
,
10412 Deref
:= Prefix
(Deref
);
10415 -- Ada 2005: If we have a component or slice of a dereference,
10416 -- something like X.all.Y (2), and the type of X is access-to-constant,
10417 -- Is_Variable will return False, because it is indeed a constant
10418 -- view. But it might be a view of a variable object, so we want the
10419 -- following condition to be True in that case.
10421 if Is_Variable
(Object
)
10422 or else (Ada_Version
>= Ada_2005
10423 and then Nkind
(Deref
) = N_Explicit_Dereference
)
10425 if Nkind
(Object
) = N_Selected_Component
then
10426 P
:= Prefix
(Object
);
10427 Prefix_Type
:= Etype
(P
);
10429 if Is_Entity_Name
(P
) then
10430 if Ekind
(Entity
(P
)) = E_Generic_In_Out_Parameter
then
10431 Prefix_Type
:= Base_Type
(Prefix_Type
);
10434 if Is_Aliased
(Entity
(P
)) then
10438 -- A discriminant check on a selected component may be expanded
10439 -- into a dereference when removing side-effects. Recover the
10440 -- original node and its type, which may be unconstrained.
10442 elsif Nkind
(P
) = N_Explicit_Dereference
10443 and then not (Comes_From_Source
(P
))
10445 P
:= Original_Node
(P
);
10446 Prefix_Type
:= Etype
(P
);
10449 -- Check for prefix being an aliased component???
10455 -- A heap object is constrained by its initial value
10457 -- Ada 2005 (AI-363): Always assume the object could be mutable in
10458 -- the dereferenced case, since the access value might denote an
10459 -- unconstrained aliased object, whereas in Ada 95 the designated
10460 -- object is guaranteed to be constrained. A worst-case assumption
10461 -- has to apply in Ada 2005 because we can't tell at compile
10462 -- time whether the object is "constrained by its initial value"
10463 -- (despite the fact that 3.10.2(26/2) and 8.5.1(5/2) are semantic
10464 -- rules (these rules are acknowledged to need fixing).
10466 if Ada_Version
< Ada_2005
then
10467 if Is_Access_Type
(Prefix_Type
)
10468 or else Nkind
(P
) = N_Explicit_Dereference
10473 else pragma Assert
(Ada_Version
>= Ada_2005
);
10474 if Is_Access_Type
(Prefix_Type
) then
10476 -- If the access type is pool-specific, and there is no
10477 -- constrained partial view of the designated type, then the
10478 -- designated object is known to be constrained.
10480 if Ekind
(Prefix_Type
) = E_Access_Type
10481 and then not Object_Type_Has_Constrained_Partial_View
10482 (Typ
=> Designated_Type
(Prefix_Type
),
10483 Scop
=> Current_Scope
)
10487 -- Otherwise (general access type, or there is a constrained
10488 -- partial view of the designated type), we need to check
10489 -- based on the designated type.
10492 Prefix_Type
:= Designated_Type
(Prefix_Type
);
10498 Original_Record_Component
(Entity
(Selector_Name
(Object
)));
10500 -- As per AI-0017, the renaming is illegal in a generic body, even
10501 -- if the subtype is indefinite.
10503 -- Ada 2005 (AI-363): In Ada 2005 an aliased object can be mutable
10505 if not Is_Constrained
(Prefix_Type
)
10506 and then (not Is_Indefinite_Subtype
(Prefix_Type
)
10508 (Is_Generic_Type
(Prefix_Type
)
10509 and then Ekind
(Current_Scope
) = E_Generic_Package
10510 and then In_Package_Body
(Current_Scope
)))
10512 and then (Is_Declared_Within_Variant
(Comp
)
10513 or else Has_Discriminant_Dependent_Constraint
(Comp
))
10514 and then (not P_Aliased
or else Ada_Version
>= Ada_2005
)
10518 -- If the prefix is of an access type at this point, then we want
10519 -- to return False, rather than calling this function recursively
10520 -- on the access object (which itself might be a discriminant-
10521 -- dependent component of some other object, but that isn't
10522 -- relevant to checking the object passed to us). This avoids
10523 -- issuing wrong errors when compiling with -gnatc, where there
10524 -- can be implicit dereferences that have not been expanded.
10526 elsif Is_Access_Type
(Etype
(Prefix
(Object
))) then
10531 Is_Dependent_Component_Of_Mutable_Object
(Prefix
(Object
));
10534 elsif Nkind
(Object
) = N_Indexed_Component
10535 or else Nkind
(Object
) = N_Slice
10537 return Is_Dependent_Component_Of_Mutable_Object
(Prefix
(Object
));
10539 -- A type conversion that Is_Variable is a view conversion:
10540 -- go back to the denoted object.
10542 elsif Nkind
(Object
) = N_Type_Conversion
then
10544 Is_Dependent_Component_Of_Mutable_Object
(Expression
(Object
));
10549 end Is_Dependent_Component_Of_Mutable_Object
;
10551 ---------------------
10552 -- Is_Dereferenced --
10553 ---------------------
10555 function Is_Dereferenced
(N
: Node_Id
) return Boolean is
10556 P
: constant Node_Id
:= Parent
(N
);
10558 return Nkind_In
(P
, N_Selected_Component
,
10559 N_Explicit_Dereference
,
10560 N_Indexed_Component
,
10562 and then Prefix
(P
) = N
;
10563 end Is_Dereferenced
;
10565 ----------------------
10566 -- Is_Descendent_Of --
10567 ----------------------
10569 function Is_Descendent_Of
(T1
: Entity_Id
; T2
: Entity_Id
) return Boolean is
10574 pragma Assert
(Nkind
(T1
) in N_Entity
);
10575 pragma Assert
(Nkind
(T2
) in N_Entity
);
10577 T
:= Base_Type
(T1
);
10579 -- Immediate return if the types match
10584 -- Comment needed here ???
10586 elsif Ekind
(T
) = E_Class_Wide_Type
then
10587 return Etype
(T
) = T2
;
10595 -- Done if we found the type we are looking for
10600 -- Done if no more derivations to check
10607 -- Following test catches error cases resulting from prev errors
10609 elsif No
(Etyp
) then
10612 elsif Is_Private_Type
(T
) and then Etyp
= Full_View
(T
) then
10615 elsif Is_Private_Type
(Etyp
) and then Full_View
(Etyp
) = T
then
10619 T
:= Base_Type
(Etyp
);
10622 end Is_Descendent_Of
;
10624 -----------------------------
10625 -- Is_Effectively_Volatile --
10626 -----------------------------
10628 function Is_Effectively_Volatile
(Id
: Entity_Id
) return Boolean is
10630 if Is_Type
(Id
) then
10632 -- An arbitrary type is effectively volatile when it is subject to
10633 -- pragma Atomic or Volatile.
10635 if Is_Volatile
(Id
) then
10638 -- An array type is effectively volatile when it is subject to pragma
10639 -- Atomic_Components or Volatile_Components or its compolent type is
10640 -- effectively volatile.
10642 elsif Is_Array_Type
(Id
) then
10644 Has_Volatile_Components
(Id
)
10646 Is_Effectively_Volatile
(Component_Type
(Base_Type
(Id
)));
10652 -- Otherwise Id denotes an object
10657 or else Has_Volatile_Components
(Id
)
10658 or else Is_Effectively_Volatile
(Etype
(Id
));
10660 end Is_Effectively_Volatile
;
10662 ------------------------------------
10663 -- Is_Effectively_Volatile_Object --
10664 ------------------------------------
10666 function Is_Effectively_Volatile_Object
(N
: Node_Id
) return Boolean is
10668 if Is_Entity_Name
(N
) then
10669 return Is_Effectively_Volatile
(Entity
(N
));
10671 elsif Nkind
(N
) = N_Expanded_Name
then
10672 return Is_Effectively_Volatile
(Entity
(N
));
10674 elsif Nkind
(N
) = N_Indexed_Component
then
10675 return Is_Effectively_Volatile_Object
(Prefix
(N
));
10677 elsif Nkind
(N
) = N_Selected_Component
then
10679 Is_Effectively_Volatile_Object
(Prefix
(N
))
10681 Is_Effectively_Volatile_Object
(Selector_Name
(N
));
10686 end Is_Effectively_Volatile_Object
;
10688 ----------------------------
10689 -- Is_Expression_Function --
10690 ----------------------------
10692 function Is_Expression_Function
(Subp
: Entity_Id
) return Boolean is
10696 if Ekind
(Subp
) /= E_Function
then
10700 Decl
:= Unit_Declaration_Node
(Subp
);
10701 return Nkind
(Decl
) = N_Subprogram_Declaration
10703 (Nkind
(Original_Node
(Decl
)) = N_Expression_Function
10705 (Present
(Corresponding_Body
(Decl
))
10707 Nkind
(Original_Node
10708 (Unit_Declaration_Node
10709 (Corresponding_Body
(Decl
)))) =
10710 N_Expression_Function
));
10712 end Is_Expression_Function
;
10714 -----------------------
10715 -- Is_EVF_Expression --
10716 -----------------------
10718 function Is_EVF_Expression
(N
: Node_Id
) return Boolean is
10719 Orig_N
: constant Node_Id
:= Original_Node
(N
);
10725 -- Detect a reference to a formal parameter of a specific tagged type
10726 -- whose related subprogram is subject to pragma Expresions_Visible with
10729 if Is_Entity_Name
(N
) and then Present
(Entity
(N
)) then
10734 and then Is_Specific_Tagged_Type
(Etype
(Id
))
10735 and then Extensions_Visible_Status
(Id
) =
10736 Extensions_Visible_False
;
10738 -- A case expression is an EVF expression when it contains at least one
10739 -- EVF dependent_expression. Note that a case expression may have been
10740 -- expanded, hence the use of Original_Node.
10742 elsif Nkind
(Orig_N
) = N_Case_Expression
then
10743 Alt
:= First
(Alternatives
(Orig_N
));
10744 while Present
(Alt
) loop
10745 if Is_EVF_Expression
(Expression
(Alt
)) then
10752 -- An if expression is an EVF expression when it contains at least one
10753 -- EVF dependent_expression. Note that an if expression may have been
10754 -- expanded, hence the use of Original_Node.
10756 elsif Nkind
(Orig_N
) = N_If_Expression
then
10757 Expr
:= Next
(First
(Expressions
(Orig_N
)));
10758 while Present
(Expr
) loop
10759 if Is_EVF_Expression
(Expr
) then
10766 -- A qualified expression or a type conversion is an EVF expression when
10767 -- its operand is an EVF expression.
10769 elsif Nkind_In
(N
, N_Qualified_Expression
,
10770 N_Unchecked_Type_Conversion
,
10773 return Is_EVF_Expression
(Expression
(N
));
10777 end Is_EVF_Expression
;
10783 function Is_False
(U
: Uint
) return Boolean is
10788 ---------------------------
10789 -- Is_Fixed_Model_Number --
10790 ---------------------------
10792 function Is_Fixed_Model_Number
(U
: Ureal
; T
: Entity_Id
) return Boolean is
10793 S
: constant Ureal
:= Small_Value
(T
);
10794 M
: Urealp
.Save_Mark
;
10798 R
:= (U
= UR_Trunc
(U
/ S
) * S
);
10799 Urealp
.Release
(M
);
10801 end Is_Fixed_Model_Number
;
10803 -------------------------------
10804 -- Is_Fully_Initialized_Type --
10805 -------------------------------
10807 function Is_Fully_Initialized_Type
(Typ
: Entity_Id
) return Boolean is
10811 if Is_Scalar_Type
(Typ
) then
10813 -- A scalar type with an aspect Default_Value is fully initialized
10815 -- Note: Iniitalize/Normalize_Scalars also ensure full initialization
10816 -- of a scalar type, but we don't take that into account here, since
10817 -- we don't want these to affect warnings.
10819 return Has_Default_Aspect
(Typ
);
10821 elsif Is_Access_Type
(Typ
) then
10824 elsif Is_Array_Type
(Typ
) then
10825 if Is_Fully_Initialized_Type
(Component_Type
(Typ
))
10826 or else (Ada_Version
>= Ada_2012
and then Has_Default_Aspect
(Typ
))
10831 -- An interesting case, if we have a constrained type one of whose
10832 -- bounds is known to be null, then there are no elements to be
10833 -- initialized, so all the elements are initialized.
10835 if Is_Constrained
(Typ
) then
10838 Indx_Typ
: Entity_Id
;
10839 Lbd
, Hbd
: Node_Id
;
10842 Indx
:= First_Index
(Typ
);
10843 while Present
(Indx
) loop
10844 if Etype
(Indx
) = Any_Type
then
10847 -- If index is a range, use directly
10849 elsif Nkind
(Indx
) = N_Range
then
10850 Lbd
:= Low_Bound
(Indx
);
10851 Hbd
:= High_Bound
(Indx
);
10854 Indx_Typ
:= Etype
(Indx
);
10856 if Is_Private_Type
(Indx_Typ
) then
10857 Indx_Typ
:= Full_View
(Indx_Typ
);
10860 if No
(Indx_Typ
) or else Etype
(Indx_Typ
) = Any_Type
then
10863 Lbd
:= Type_Low_Bound
(Indx_Typ
);
10864 Hbd
:= Type_High_Bound
(Indx_Typ
);
10868 if Compile_Time_Known_Value
(Lbd
)
10870 Compile_Time_Known_Value
(Hbd
)
10872 if Expr_Value
(Hbd
) < Expr_Value
(Lbd
) then
10882 -- If no null indexes, then type is not fully initialized
10888 elsif Is_Record_Type
(Typ
) then
10889 if Has_Discriminants
(Typ
)
10891 Present
(Discriminant_Default_Value
(First_Discriminant
(Typ
)))
10892 and then Is_Fully_Initialized_Variant
(Typ
)
10897 -- We consider bounded string types to be fully initialized, because
10898 -- otherwise we get false alarms when the Data component is not
10899 -- default-initialized.
10901 if Is_Bounded_String
(Typ
) then
10905 -- Controlled records are considered to be fully initialized if
10906 -- there is a user defined Initialize routine. This may not be
10907 -- entirely correct, but as the spec notes, we are guessing here
10908 -- what is best from the point of view of issuing warnings.
10910 if Is_Controlled
(Typ
) then
10912 Utyp
: constant Entity_Id
:= Underlying_Type
(Typ
);
10915 if Present
(Utyp
) then
10917 Init
: constant Entity_Id
:=
10919 (Underlying_Type
(Typ
), Name_Initialize
));
10923 and then Comes_From_Source
(Init
)
10925 Is_Predefined_File_Name
10926 (File_Name
(Get_Source_File_Index
(Sloc
(Init
))))
10930 elsif Has_Null_Extension
(Typ
)
10932 Is_Fully_Initialized_Type
10933 (Etype
(Base_Type
(Typ
)))
10942 -- Otherwise see if all record components are initialized
10948 Ent
:= First_Entity
(Typ
);
10949 while Present
(Ent
) loop
10950 if Ekind
(Ent
) = E_Component
10951 and then (No
(Parent
(Ent
))
10952 or else No
(Expression
(Parent
(Ent
))))
10953 and then not Is_Fully_Initialized_Type
(Etype
(Ent
))
10955 -- Special VM case for tag components, which need to be
10956 -- defined in this case, but are never initialized as VMs
10957 -- are using other dispatching mechanisms. Ignore this
10958 -- uninitialized case. Note that this applies both to the
10959 -- uTag entry and the main vtable pointer (CPP_Class case).
10961 and then (Tagged_Type_Expansion
or else not Is_Tag
(Ent
))
10970 -- No uninitialized components, so type is fully initialized.
10971 -- Note that this catches the case of no components as well.
10975 elsif Is_Concurrent_Type
(Typ
) then
10978 elsif Is_Private_Type
(Typ
) then
10980 U
: constant Entity_Id
:= Underlying_Type
(Typ
);
10986 return Is_Fully_Initialized_Type
(U
);
10993 end Is_Fully_Initialized_Type
;
10995 ----------------------------------
10996 -- Is_Fully_Initialized_Variant --
10997 ----------------------------------
10999 function Is_Fully_Initialized_Variant
(Typ
: Entity_Id
) return Boolean is
11000 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
11001 Constraints
: constant List_Id
:= New_List
;
11002 Components
: constant Elist_Id
:= New_Elmt_List
;
11003 Comp_Elmt
: Elmt_Id
;
11005 Comp_List
: Node_Id
;
11007 Discr_Val
: Node_Id
;
11009 Report_Errors
: Boolean;
11010 pragma Warnings
(Off
, Report_Errors
);
11013 if Serious_Errors_Detected
> 0 then
11017 if Is_Record_Type
(Typ
)
11018 and then Nkind
(Parent
(Typ
)) = N_Full_Type_Declaration
11019 and then Nkind
(Type_Definition
(Parent
(Typ
))) = N_Record_Definition
11021 Comp_List
:= Component_List
(Type_Definition
(Parent
(Typ
)));
11023 Discr
:= First_Discriminant
(Typ
);
11024 while Present
(Discr
) loop
11025 if Nkind
(Parent
(Discr
)) = N_Discriminant_Specification
then
11026 Discr_Val
:= Expression
(Parent
(Discr
));
11028 if Present
(Discr_Val
)
11029 and then Is_OK_Static_Expression
(Discr_Val
)
11031 Append_To
(Constraints
,
11032 Make_Component_Association
(Loc
,
11033 Choices
=> New_List
(New_Occurrence_Of
(Discr
, Loc
)),
11034 Expression
=> New_Copy
(Discr_Val
)));
11042 Next_Discriminant
(Discr
);
11047 Comp_List
=> Comp_List
,
11048 Governed_By
=> Constraints
,
11049 Into
=> Components
,
11050 Report_Errors
=> Report_Errors
);
11052 -- Check that each component present is fully initialized
11054 Comp_Elmt
:= First_Elmt
(Components
);
11055 while Present
(Comp_Elmt
) loop
11056 Comp_Id
:= Node
(Comp_Elmt
);
11058 if Ekind
(Comp_Id
) = E_Component
11059 and then (No
(Parent
(Comp_Id
))
11060 or else No
(Expression
(Parent
(Comp_Id
))))
11061 and then not Is_Fully_Initialized_Type
(Etype
(Comp_Id
))
11066 Next_Elmt
(Comp_Elmt
);
11071 elsif Is_Private_Type
(Typ
) then
11073 U
: constant Entity_Id
:= Underlying_Type
(Typ
);
11079 return Is_Fully_Initialized_Variant
(U
);
11086 end Is_Fully_Initialized_Variant
;
11088 ----------------------------
11089 -- Is_Inherited_Operation --
11090 ----------------------------
11092 function Is_Inherited_Operation
(E
: Entity_Id
) return Boolean is
11093 pragma Assert
(Is_Overloadable
(E
));
11094 Kind
: constant Node_Kind
:= Nkind
(Parent
(E
));
11096 return Kind
= N_Full_Type_Declaration
11097 or else Kind
= N_Private_Extension_Declaration
11098 or else Kind
= N_Subtype_Declaration
11099 or else (Ekind
(E
) = E_Enumeration_Literal
11100 and then Is_Derived_Type
(Etype
(E
)));
11101 end Is_Inherited_Operation
;
11103 -------------------------------------
11104 -- Is_Inherited_Operation_For_Type --
11105 -------------------------------------
11107 function Is_Inherited_Operation_For_Type
11109 Typ
: Entity_Id
) return Boolean
11112 -- Check that the operation has been created by the type declaration
11114 return Is_Inherited_Operation
(E
)
11115 and then Defining_Identifier
(Parent
(E
)) = Typ
;
11116 end Is_Inherited_Operation_For_Type
;
11122 function Is_Iterator
(Typ
: Entity_Id
) return Boolean is
11123 Ifaces_List
: Elist_Id
;
11124 Iface_Elmt
: Elmt_Id
;
11128 if Is_Class_Wide_Type
(Typ
)
11129 and then Nam_In
(Chars
(Etype
(Typ
)), Name_Forward_Iterator
,
11130 Name_Reversible_Iterator
)
11132 Is_Predefined_File_Name
11133 (Unit_File_Name
(Get_Source_Unit
(Etype
(Typ
))))
11137 elsif not Is_Tagged_Type
(Typ
) or else not Is_Derived_Type
(Typ
) then
11140 elsif Present
(Find_Value_Of_Aspect
(Typ
, Aspect_Iterable
)) then
11144 Collect_Interfaces
(Typ
, Ifaces_List
);
11146 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
11147 while Present
(Iface_Elmt
) loop
11148 Iface
:= Node
(Iface_Elmt
);
11149 if Chars
(Iface
) = Name_Forward_Iterator
11151 Is_Predefined_File_Name
11152 (Unit_File_Name
(Get_Source_Unit
(Iface
)))
11157 Next_Elmt
(Iface_Elmt
);
11168 -- We seem to have a lot of overlapping functions that do similar things
11169 -- (testing for left hand sides or lvalues???).
11171 function Is_LHS
(N
: Node_Id
) return Is_LHS_Result
is
11172 P
: constant Node_Id
:= Parent
(N
);
11175 -- Return True if we are the left hand side of an assignment statement
11177 if Nkind
(P
) = N_Assignment_Statement
then
11178 if Name
(P
) = N
then
11184 -- Case of prefix of indexed or selected component or slice
11186 elsif Nkind_In
(P
, N_Indexed_Component
, N_Selected_Component
, N_Slice
)
11187 and then N
= Prefix
(P
)
11189 -- Here we have the case where the parent P is N.Q or N(Q .. R).
11190 -- If P is an LHS, then N is also effectively an LHS, but there
11191 -- is an important exception. If N is of an access type, then
11192 -- what we really have is N.all.Q (or N.all(Q .. R)). In either
11193 -- case this makes N.all a left hand side but not N itself.
11195 -- If we don't know the type yet, this is the case where we return
11196 -- Unknown, since the answer depends on the type which is unknown.
11198 if No
(Etype
(N
)) then
11201 -- We have an Etype set, so we can check it
11203 elsif Is_Access_Type
(Etype
(N
)) then
11206 -- OK, not access type case, so just test whole expression
11212 -- All other cases are not left hand sides
11219 -----------------------------
11220 -- Is_Library_Level_Entity --
11221 -----------------------------
11223 function Is_Library_Level_Entity
(E
: Entity_Id
) return Boolean is
11225 -- The following is a small optimization, and it also properly handles
11226 -- discriminals, which in task bodies might appear in expressions before
11227 -- the corresponding procedure has been created, and which therefore do
11228 -- not have an assigned scope.
11230 if Is_Formal
(E
) then
11234 -- Normal test is simply that the enclosing dynamic scope is Standard
11236 return Enclosing_Dynamic_Scope
(E
) = Standard_Standard
;
11237 end Is_Library_Level_Entity
;
11239 --------------------------------
11240 -- Is_Limited_Class_Wide_Type --
11241 --------------------------------
11243 function Is_Limited_Class_Wide_Type
(Typ
: Entity_Id
) return Boolean is
11246 Is_Class_Wide_Type
(Typ
)
11247 and then (Is_Limited_Type
(Typ
) or else From_Limited_With
(Typ
));
11248 end Is_Limited_Class_Wide_Type
;
11250 ---------------------------------
11251 -- Is_Local_Variable_Reference --
11252 ---------------------------------
11254 function Is_Local_Variable_Reference
(Expr
: Node_Id
) return Boolean is
11256 if not Is_Entity_Name
(Expr
) then
11261 Ent
: constant Entity_Id
:= Entity
(Expr
);
11262 Sub
: constant Entity_Id
:= Enclosing_Subprogram
(Ent
);
11264 if not Ekind_In
(Ent
, E_Variable
, E_In_Out_Parameter
) then
11267 return Present
(Sub
) and then Sub
= Current_Subprogram
;
11271 end Is_Local_Variable_Reference
;
11273 -------------------------
11274 -- Is_Object_Reference --
11275 -------------------------
11277 function Is_Object_Reference
(N
: Node_Id
) return Boolean is
11279 function Is_Internally_Generated_Renaming
(N
: Node_Id
) return Boolean;
11280 -- Determine whether N is the name of an internally-generated renaming
11282 --------------------------------------
11283 -- Is_Internally_Generated_Renaming --
11284 --------------------------------------
11286 function Is_Internally_Generated_Renaming
(N
: Node_Id
) return Boolean is
11291 while Present
(P
) loop
11292 if Nkind
(P
) = N_Object_Renaming_Declaration
then
11293 return not Comes_From_Source
(P
);
11294 elsif Is_List_Member
(P
) then
11302 end Is_Internally_Generated_Renaming
;
11304 -- Start of processing for Is_Object_Reference
11307 if Is_Entity_Name
(N
) then
11308 return Present
(Entity
(N
)) and then Is_Object
(Entity
(N
));
11312 when N_Indexed_Component | N_Slice
=>
11314 Is_Object_Reference
(Prefix
(N
))
11315 or else Is_Access_Type
(Etype
(Prefix
(N
)));
11317 -- In Ada 95, a function call is a constant object; a procedure
11320 when N_Function_Call
=>
11321 return Etype
(N
) /= Standard_Void_Type
;
11323 -- Attributes 'Input, 'Old and 'Result produce objects
11325 when N_Attribute_Reference
=>
11328 (Attribute_Name
(N
), Name_Input
, Name_Old
, Name_Result
);
11330 when N_Selected_Component
=>
11332 Is_Object_Reference
(Selector_Name
(N
))
11334 (Is_Object_Reference
(Prefix
(N
))
11335 or else Is_Access_Type
(Etype
(Prefix
(N
))));
11337 when N_Explicit_Dereference
=>
11340 -- A view conversion of a tagged object is an object reference
11342 when N_Type_Conversion
=>
11343 return Is_Tagged_Type
(Etype
(Subtype_Mark
(N
)))
11344 and then Is_Tagged_Type
(Etype
(Expression
(N
)))
11345 and then Is_Object_Reference
(Expression
(N
));
11347 -- An unchecked type conversion is considered to be an object if
11348 -- the operand is an object (this construction arises only as a
11349 -- result of expansion activities).
11351 when N_Unchecked_Type_Conversion
=>
11354 -- Allow string literals to act as objects as long as they appear
11355 -- in internally-generated renamings. The expansion of iterators
11356 -- may generate such renamings when the range involves a string
11359 when N_String_Literal
=>
11360 return Is_Internally_Generated_Renaming
(Parent
(N
));
11362 -- AI05-0003: In Ada 2012 a qualified expression is a name.
11363 -- This allows disambiguation of function calls and the use
11364 -- of aggregates in more contexts.
11366 when N_Qualified_Expression
=>
11367 if Ada_Version
< Ada_2012
then
11370 return Is_Object_Reference
(Expression
(N
))
11371 or else Nkind
(Expression
(N
)) = N_Aggregate
;
11378 end Is_Object_Reference
;
11380 -----------------------------------
11381 -- Is_OK_Variable_For_Out_Formal --
11382 -----------------------------------
11384 function Is_OK_Variable_For_Out_Formal
(AV
: Node_Id
) return Boolean is
11386 Note_Possible_Modification
(AV
, Sure
=> True);
11388 -- We must reject parenthesized variable names. Comes_From_Source is
11389 -- checked because there are currently cases where the compiler violates
11390 -- this rule (e.g. passing a task object to its controlled Initialize
11391 -- routine). This should be properly documented in sinfo???
11393 if Paren_Count
(AV
) > 0 and then Comes_From_Source
(AV
) then
11396 -- A variable is always allowed
11398 elsif Is_Variable
(AV
) then
11401 -- Unchecked conversions are allowed only if they come from the
11402 -- generated code, which sometimes uses unchecked conversions for out
11403 -- parameters in cases where code generation is unaffected. We tell
11404 -- source unchecked conversions by seeing if they are rewrites of
11405 -- an original Unchecked_Conversion function call, or of an explicit
11406 -- conversion of a function call or an aggregate (as may happen in the
11407 -- expansion of a packed array aggregate).
11409 elsif Nkind
(AV
) = N_Unchecked_Type_Conversion
then
11410 if Nkind_In
(Original_Node
(AV
), N_Function_Call
, N_Aggregate
) then
11413 elsif Comes_From_Source
(AV
)
11414 and then Nkind
(Original_Node
(Expression
(AV
))) = N_Function_Call
11418 elsif Nkind
(Original_Node
(AV
)) = N_Type_Conversion
then
11419 return Is_OK_Variable_For_Out_Formal
(Expression
(AV
));
11425 -- Normal type conversions are allowed if argument is a variable
11427 elsif Nkind
(AV
) = N_Type_Conversion
then
11428 if Is_Variable
(Expression
(AV
))
11429 and then Paren_Count
(Expression
(AV
)) = 0
11431 Note_Possible_Modification
(Expression
(AV
), Sure
=> True);
11434 -- We also allow a non-parenthesized expression that raises
11435 -- constraint error if it rewrites what used to be a variable
11437 elsif Raises_Constraint_Error
(Expression
(AV
))
11438 and then Paren_Count
(Expression
(AV
)) = 0
11439 and then Is_Variable
(Original_Node
(Expression
(AV
)))
11443 -- Type conversion of something other than a variable
11449 -- If this node is rewritten, then test the original form, if that is
11450 -- OK, then we consider the rewritten node OK (for example, if the
11451 -- original node is a conversion, then Is_Variable will not be true
11452 -- but we still want to allow the conversion if it converts a variable).
11454 elsif Original_Node
(AV
) /= AV
then
11456 -- In Ada 2012, the explicit dereference may be a rewritten call to a
11457 -- Reference function.
11459 if Ada_Version
>= Ada_2012
11460 and then Nkind
(Original_Node
(AV
)) = N_Function_Call
11462 Has_Implicit_Dereference
(Etype
(Name
(Original_Node
(AV
))))
11467 return Is_OK_Variable_For_Out_Formal
(Original_Node
(AV
));
11470 -- All other non-variables are rejected
11475 end Is_OK_Variable_For_Out_Formal
;
11477 -----------------------------------
11478 -- Is_Partially_Initialized_Type --
11479 -----------------------------------
11481 function Is_Partially_Initialized_Type
11483 Include_Implicit
: Boolean := True) return Boolean
11486 if Is_Scalar_Type
(Typ
) then
11489 elsif Is_Access_Type
(Typ
) then
11490 return Include_Implicit
;
11492 elsif Is_Array_Type
(Typ
) then
11494 -- If component type is partially initialized, so is array type
11496 if Is_Partially_Initialized_Type
11497 (Component_Type
(Typ
), Include_Implicit
)
11501 -- Otherwise we are only partially initialized if we are fully
11502 -- initialized (this is the empty array case, no point in us
11503 -- duplicating that code here).
11506 return Is_Fully_Initialized_Type
(Typ
);
11509 elsif Is_Record_Type
(Typ
) then
11511 -- A discriminated type is always partially initialized if in
11514 if Has_Discriminants
(Typ
) and then Include_Implicit
then
11517 -- A tagged type is always partially initialized
11519 elsif Is_Tagged_Type
(Typ
) then
11522 -- Case of non-discriminated record
11528 Component_Present
: Boolean := False;
11529 -- Set True if at least one component is present. If no
11530 -- components are present, then record type is fully
11531 -- initialized (another odd case, like the null array).
11534 -- Loop through components
11536 Ent
:= First_Entity
(Typ
);
11537 while Present
(Ent
) loop
11538 if Ekind
(Ent
) = E_Component
then
11539 Component_Present
:= True;
11541 -- If a component has an initialization expression then
11542 -- the enclosing record type is partially initialized
11544 if Present
(Parent
(Ent
))
11545 and then Present
(Expression
(Parent
(Ent
)))
11549 -- If a component is of a type which is itself partially
11550 -- initialized, then the enclosing record type is also.
11552 elsif Is_Partially_Initialized_Type
11553 (Etype
(Ent
), Include_Implicit
)
11562 -- No initialized components found. If we found any components
11563 -- they were all uninitialized so the result is false.
11565 if Component_Present
then
11568 -- But if we found no components, then all the components are
11569 -- initialized so we consider the type to be initialized.
11577 -- Concurrent types are always fully initialized
11579 elsif Is_Concurrent_Type
(Typ
) then
11582 -- For a private type, go to underlying type. If there is no underlying
11583 -- type then just assume this partially initialized. Not clear if this
11584 -- can happen in a non-error case, but no harm in testing for this.
11586 elsif Is_Private_Type
(Typ
) then
11588 U
: constant Entity_Id
:= Underlying_Type
(Typ
);
11593 return Is_Partially_Initialized_Type
(U
, Include_Implicit
);
11597 -- For any other type (are there any?) assume partially initialized
11602 end Is_Partially_Initialized_Type
;
11604 ------------------------------------
11605 -- Is_Potentially_Persistent_Type --
11606 ------------------------------------
11608 function Is_Potentially_Persistent_Type
(T
: Entity_Id
) return Boolean is
11613 -- For private type, test corresponding full type
11615 if Is_Private_Type
(T
) then
11616 return Is_Potentially_Persistent_Type
(Full_View
(T
));
11618 -- Scalar types are potentially persistent
11620 elsif Is_Scalar_Type
(T
) then
11623 -- Record type is potentially persistent if not tagged and the types of
11624 -- all it components are potentially persistent, and no component has
11625 -- an initialization expression.
11627 elsif Is_Record_Type
(T
)
11628 and then not Is_Tagged_Type
(T
)
11629 and then not Is_Partially_Initialized_Type
(T
)
11631 Comp
:= First_Component
(T
);
11632 while Present
(Comp
) loop
11633 if not Is_Potentially_Persistent_Type
(Etype
(Comp
)) then
11636 Next_Entity
(Comp
);
11642 -- Array type is potentially persistent if its component type is
11643 -- potentially persistent and if all its constraints are static.
11645 elsif Is_Array_Type
(T
) then
11646 if not Is_Potentially_Persistent_Type
(Component_Type
(T
)) then
11650 Indx
:= First_Index
(T
);
11651 while Present
(Indx
) loop
11652 if not Is_OK_Static_Subtype
(Etype
(Indx
)) then
11661 -- All other types are not potentially persistent
11666 end Is_Potentially_Persistent_Type
;
11668 --------------------------------
11669 -- Is_Potentially_Unevaluated --
11670 --------------------------------
11672 function Is_Potentially_Unevaluated
(N
: Node_Id
) return Boolean is
11680 -- A postcondition whose expression is a short-circuit is broken down
11681 -- into individual aspects for better exception reporting. The original
11682 -- short-circuit expression is rewritten as the second operand, and an
11683 -- occurrence of 'Old in that operand is potentially unevaluated.
11684 -- See Sem_ch13.adb for details of this transformation.
11686 if Nkind
(Original_Node
(Par
)) = N_And_Then
then
11690 while not Nkind_In
(Par
, N_If_Expression
,
11698 Par
:= Parent
(Par
);
11700 -- If the context is not an expression, or if is the result of
11701 -- expansion of an enclosing construct (such as another attribute)
11702 -- the predicate does not apply.
11704 if Nkind
(Par
) not in N_Subexpr
11705 or else not Comes_From_Source
(Par
)
11711 if Nkind
(Par
) = N_If_Expression
then
11712 return Is_Elsif
(Par
) or else Expr
/= First
(Expressions
(Par
));
11714 elsif Nkind
(Par
) = N_Case_Expression
then
11715 return Expr
/= Expression
(Par
);
11717 elsif Nkind_In
(Par
, N_And_Then
, N_Or_Else
) then
11718 return Expr
= Right_Opnd
(Par
);
11720 elsif Nkind_In
(Par
, N_In
, N_Not_In
) then
11721 return Expr
/= Left_Opnd
(Par
);
11726 end Is_Potentially_Unevaluated
;
11728 ---------------------------------
11729 -- Is_Protected_Self_Reference --
11730 ---------------------------------
11732 function Is_Protected_Self_Reference
(N
: Node_Id
) return Boolean is
11734 function In_Access_Definition
(N
: Node_Id
) return Boolean;
11735 -- Returns true if N belongs to an access definition
11737 --------------------------
11738 -- In_Access_Definition --
11739 --------------------------
11741 function In_Access_Definition
(N
: Node_Id
) return Boolean is
11746 while Present
(P
) loop
11747 if Nkind
(P
) = N_Access_Definition
then
11755 end In_Access_Definition
;
11757 -- Start of processing for Is_Protected_Self_Reference
11760 -- Verify that prefix is analyzed and has the proper form. Note that
11761 -- the attributes Elab_Spec, Elab_Body, Elab_Subp_Body and UET_Address,
11762 -- which also produce the address of an entity, do not analyze their
11763 -- prefix because they denote entities that are not necessarily visible.
11764 -- Neither of them can apply to a protected type.
11766 return Ada_Version
>= Ada_2005
11767 and then Is_Entity_Name
(N
)
11768 and then Present
(Entity
(N
))
11769 and then Is_Protected_Type
(Entity
(N
))
11770 and then In_Open_Scopes
(Entity
(N
))
11771 and then not In_Access_Definition
(N
);
11772 end Is_Protected_Self_Reference
;
11774 -----------------------------
11775 -- Is_RCI_Pkg_Spec_Or_Body --
11776 -----------------------------
11778 function Is_RCI_Pkg_Spec_Or_Body
(Cunit
: Node_Id
) return Boolean is
11780 function Is_RCI_Pkg_Decl_Cunit
(Cunit
: Node_Id
) return Boolean;
11781 -- Return True if the unit of Cunit is an RCI package declaration
11783 ---------------------------
11784 -- Is_RCI_Pkg_Decl_Cunit --
11785 ---------------------------
11787 function Is_RCI_Pkg_Decl_Cunit
(Cunit
: Node_Id
) return Boolean is
11788 The_Unit
: constant Node_Id
:= Unit
(Cunit
);
11791 if Nkind
(The_Unit
) /= N_Package_Declaration
then
11795 return Is_Remote_Call_Interface
(Defining_Entity
(The_Unit
));
11796 end Is_RCI_Pkg_Decl_Cunit
;
11798 -- Start of processing for Is_RCI_Pkg_Spec_Or_Body
11801 return Is_RCI_Pkg_Decl_Cunit
(Cunit
)
11803 (Nkind
(Unit
(Cunit
)) = N_Package_Body
11804 and then Is_RCI_Pkg_Decl_Cunit
(Library_Unit
(Cunit
)));
11805 end Is_RCI_Pkg_Spec_Or_Body
;
11807 -----------------------------------------
11808 -- Is_Remote_Access_To_Class_Wide_Type --
11809 -----------------------------------------
11811 function Is_Remote_Access_To_Class_Wide_Type
11812 (E
: Entity_Id
) return Boolean
11815 -- A remote access to class-wide type is a general access to object type
11816 -- declared in the visible part of a Remote_Types or Remote_Call_
11819 return Ekind
(E
) = E_General_Access_Type
11820 and then (Is_Remote_Call_Interface
(E
) or else Is_Remote_Types
(E
));
11821 end Is_Remote_Access_To_Class_Wide_Type
;
11823 -----------------------------------------
11824 -- Is_Remote_Access_To_Subprogram_Type --
11825 -----------------------------------------
11827 function Is_Remote_Access_To_Subprogram_Type
11828 (E
: Entity_Id
) return Boolean
11831 return (Ekind
(E
) = E_Access_Subprogram_Type
11832 or else (Ekind
(E
) = E_Record_Type
11833 and then Present
(Corresponding_Remote_Type
(E
))))
11834 and then (Is_Remote_Call_Interface
(E
) or else Is_Remote_Types
(E
));
11835 end Is_Remote_Access_To_Subprogram_Type
;
11837 --------------------
11838 -- Is_Remote_Call --
11839 --------------------
11841 function Is_Remote_Call
(N
: Node_Id
) return Boolean is
11843 if Nkind
(N
) not in N_Subprogram_Call
then
11845 -- An entry call cannot be remote
11849 elsif Nkind
(Name
(N
)) in N_Has_Entity
11850 and then Is_Remote_Call_Interface
(Entity
(Name
(N
)))
11852 -- A subprogram declared in the spec of a RCI package is remote
11856 elsif Nkind
(Name
(N
)) = N_Explicit_Dereference
11857 and then Is_Remote_Access_To_Subprogram_Type
11858 (Etype
(Prefix
(Name
(N
))))
11860 -- The dereference of a RAS is a remote call
11864 elsif Present
(Controlling_Argument
(N
))
11865 and then Is_Remote_Access_To_Class_Wide_Type
11866 (Etype
(Controlling_Argument
(N
)))
11868 -- Any primitive operation call with a controlling argument of
11869 -- a RACW type is a remote call.
11874 -- All other calls are local calls
11877 end Is_Remote_Call
;
11879 ----------------------
11880 -- Is_Renamed_Entry --
11881 ----------------------
11883 function Is_Renamed_Entry
(Proc_Nam
: Entity_Id
) return Boolean is
11884 Orig_Node
: Node_Id
:= Empty
;
11885 Subp_Decl
: Node_Id
:= Parent
(Parent
(Proc_Nam
));
11887 function Is_Entry
(Nam
: Node_Id
) return Boolean;
11888 -- Determine whether Nam is an entry. Traverse selectors if there are
11889 -- nested selected components.
11895 function Is_Entry
(Nam
: Node_Id
) return Boolean is
11897 if Nkind
(Nam
) = N_Selected_Component
then
11898 return Is_Entry
(Selector_Name
(Nam
));
11901 return Ekind
(Entity
(Nam
)) = E_Entry
;
11904 -- Start of processing for Is_Renamed_Entry
11907 if Present
(Alias
(Proc_Nam
)) then
11908 Subp_Decl
:= Parent
(Parent
(Alias
(Proc_Nam
)));
11911 -- Look for a rewritten subprogram renaming declaration
11913 if Nkind
(Subp_Decl
) = N_Subprogram_Declaration
11914 and then Present
(Original_Node
(Subp_Decl
))
11916 Orig_Node
:= Original_Node
(Subp_Decl
);
11919 -- The rewritten subprogram is actually an entry
11921 if Present
(Orig_Node
)
11922 and then Nkind
(Orig_Node
) = N_Subprogram_Renaming_Declaration
11923 and then Is_Entry
(Name
(Orig_Node
))
11929 end Is_Renamed_Entry
;
11931 ----------------------------
11932 -- Is_Reversible_Iterator --
11933 ----------------------------
11935 function Is_Reversible_Iterator
(Typ
: Entity_Id
) return Boolean is
11936 Ifaces_List
: Elist_Id
;
11937 Iface_Elmt
: Elmt_Id
;
11941 if Is_Class_Wide_Type
(Typ
)
11942 and then Chars
(Etype
(Typ
)) = Name_Reversible_Iterator
11943 and then Is_Predefined_File_Name
11944 (Unit_File_Name
(Get_Source_Unit
(Etype
(Typ
))))
11948 elsif not Is_Tagged_Type
(Typ
) or else not Is_Derived_Type
(Typ
) then
11952 Collect_Interfaces
(Typ
, Ifaces_List
);
11954 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
11955 while Present
(Iface_Elmt
) loop
11956 Iface
:= Node
(Iface_Elmt
);
11957 if Chars
(Iface
) = Name_Reversible_Iterator
11959 Is_Predefined_File_Name
11960 (Unit_File_Name
(Get_Source_Unit
(Iface
)))
11965 Next_Elmt
(Iface_Elmt
);
11970 end Is_Reversible_Iterator
;
11972 ----------------------
11973 -- Is_Selector_Name --
11974 ----------------------
11976 function Is_Selector_Name
(N
: Node_Id
) return Boolean is
11978 if not Is_List_Member
(N
) then
11980 P
: constant Node_Id
:= Parent
(N
);
11982 return Nkind_In
(P
, N_Expanded_Name
,
11983 N_Generic_Association
,
11984 N_Parameter_Association
,
11985 N_Selected_Component
)
11986 and then Selector_Name
(P
) = N
;
11991 L
: constant List_Id
:= List_Containing
(N
);
11992 P
: constant Node_Id
:= Parent
(L
);
11994 return (Nkind
(P
) = N_Discriminant_Association
11995 and then Selector_Names
(P
) = L
)
11997 (Nkind
(P
) = N_Component_Association
11998 and then Choices
(P
) = L
);
12001 end Is_Selector_Name
;
12003 -------------------------------------
12004 -- Is_SPARK_05_Initialization_Expr --
12005 -------------------------------------
12007 function Is_SPARK_05_Initialization_Expr
(N
: Node_Id
) return Boolean is
12010 Comp_Assn
: Node_Id
;
12011 Orig_N
: constant Node_Id
:= Original_Node
(N
);
12016 if not Comes_From_Source
(Orig_N
) then
12020 pragma Assert
(Nkind
(Orig_N
) in N_Subexpr
);
12022 case Nkind
(Orig_N
) is
12023 when N_Character_Literal |
12024 N_Integer_Literal |
12026 N_String_Literal
=>
12029 when N_Identifier |
12031 if Is_Entity_Name
(Orig_N
)
12032 and then Present
(Entity
(Orig_N
)) -- needed in some cases
12034 case Ekind
(Entity
(Orig_N
)) is
12036 E_Enumeration_Literal |
12041 if Is_Type
(Entity
(Orig_N
)) then
12049 when N_Qualified_Expression |
12050 N_Type_Conversion
=>
12051 Is_Ok
:= Is_SPARK_05_Initialization_Expr
(Expression
(Orig_N
));
12054 Is_Ok
:= Is_SPARK_05_Initialization_Expr
(Right_Opnd
(Orig_N
));
12058 N_Membership_Test
=>
12059 Is_Ok
:= Is_SPARK_05_Initialization_Expr
(Left_Opnd
(Orig_N
))
12061 Is_SPARK_05_Initialization_Expr
(Right_Opnd
(Orig_N
));
12064 N_Extension_Aggregate
=>
12065 if Nkind
(Orig_N
) = N_Extension_Aggregate
then
12067 Is_SPARK_05_Initialization_Expr
(Ancestor_Part
(Orig_N
));
12070 Expr
:= First
(Expressions
(Orig_N
));
12071 while Present
(Expr
) loop
12072 if not Is_SPARK_05_Initialization_Expr
(Expr
) then
12080 Comp_Assn
:= First
(Component_Associations
(Orig_N
));
12081 while Present
(Comp_Assn
) loop
12082 Expr
:= Expression
(Comp_Assn
);
12084 -- Note: test for Present here needed for box assocation
12087 and then not Is_SPARK_05_Initialization_Expr
(Expr
)
12096 when N_Attribute_Reference
=>
12097 if Nkind
(Prefix
(Orig_N
)) in N_Subexpr
then
12098 Is_Ok
:= Is_SPARK_05_Initialization_Expr
(Prefix
(Orig_N
));
12101 Expr
:= First
(Expressions
(Orig_N
));
12102 while Present
(Expr
) loop
12103 if not Is_SPARK_05_Initialization_Expr
(Expr
) then
12111 -- Selected components might be expanded named not yet resolved, so
12112 -- default on the safe side. (Eg on sparklex.ads)
12114 when N_Selected_Component
=>
12123 end Is_SPARK_05_Initialization_Expr
;
12125 ----------------------------------
12126 -- Is_SPARK_05_Object_Reference --
12127 ----------------------------------
12129 function Is_SPARK_05_Object_Reference
(N
: Node_Id
) return Boolean is
12131 if Is_Entity_Name
(N
) then
12132 return Present
(Entity
(N
))
12134 (Ekind_In
(Entity
(N
), E_Constant
, E_Variable
)
12135 or else Ekind
(Entity
(N
)) in Formal_Kind
);
12139 when N_Selected_Component
=>
12140 return Is_SPARK_05_Object_Reference
(Prefix
(N
));
12146 end Is_SPARK_05_Object_Reference
;
12148 -----------------------------
12149 -- Is_Specific_Tagged_Type --
12150 -----------------------------
12152 function Is_Specific_Tagged_Type
(Typ
: Entity_Id
) return Boolean is
12153 Full_Typ
: Entity_Id
;
12156 -- Handle private types
12158 if Is_Private_Type
(Typ
) and then Present
(Full_View
(Typ
)) then
12159 Full_Typ
:= Full_View
(Typ
);
12164 -- A specific tagged type is a non-class-wide tagged type
12166 return Is_Tagged_Type
(Full_Typ
) and not Is_Class_Wide_Type
(Full_Typ
);
12167 end Is_Specific_Tagged_Type
;
12173 function Is_Statement
(N
: Node_Id
) return Boolean is
12176 Nkind
(N
) in N_Statement_Other_Than_Procedure_Call
12177 or else Nkind
(N
) = N_Procedure_Call_Statement
;
12180 --------------------------------------------------
12181 -- Is_Subprogram_Stub_Without_Prior_Declaration --
12182 --------------------------------------------------
12184 function Is_Subprogram_Stub_Without_Prior_Declaration
12185 (N
: Node_Id
) return Boolean
12188 -- A subprogram stub without prior declaration serves as declaration for
12189 -- the actual subprogram body. As such, it has an attached defining
12190 -- entity of E_[Generic_]Function or E_[Generic_]Procedure.
12192 return Nkind
(N
) = N_Subprogram_Body_Stub
12193 and then Ekind
(Defining_Entity
(N
)) /= E_Subprogram_Body
;
12194 end Is_Subprogram_Stub_Without_Prior_Declaration
;
12196 ---------------------------------
12197 -- Is_Synchronized_Tagged_Type --
12198 ---------------------------------
12200 function Is_Synchronized_Tagged_Type
(E
: Entity_Id
) return Boolean is
12201 Kind
: constant Entity_Kind
:= Ekind
(Base_Type
(E
));
12204 -- A task or protected type derived from an interface is a tagged type.
12205 -- Such a tagged type is called a synchronized tagged type, as are
12206 -- synchronized interfaces and private extensions whose declaration
12207 -- includes the reserved word synchronized.
12209 return (Is_Tagged_Type
(E
)
12210 and then (Kind
= E_Task_Type
12212 Kind
= E_Protected_Type
))
12215 and then Is_Synchronized_Interface
(E
))
12217 (Ekind
(E
) = E_Record_Type_With_Private
12218 and then Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
12219 and then (Synchronized_Present
(Parent
(E
))
12220 or else Is_Synchronized_Interface
(Etype
(E
))));
12221 end Is_Synchronized_Tagged_Type
;
12227 function Is_Transfer
(N
: Node_Id
) return Boolean is
12228 Kind
: constant Node_Kind
:= Nkind
(N
);
12231 if Kind
= N_Simple_Return_Statement
12233 Kind
= N_Extended_Return_Statement
12235 Kind
= N_Goto_Statement
12237 Kind
= N_Raise_Statement
12239 Kind
= N_Requeue_Statement
12243 elsif (Kind
= N_Exit_Statement
or else Kind
in N_Raise_xxx_Error
)
12244 and then No
(Condition
(N
))
12248 elsif Kind
= N_Procedure_Call_Statement
12249 and then Is_Entity_Name
(Name
(N
))
12250 and then Present
(Entity
(Name
(N
)))
12251 and then No_Return
(Entity
(Name
(N
)))
12255 elsif Nkind
(Original_Node
(N
)) = N_Raise_Statement
then
12267 function Is_True
(U
: Uint
) return Boolean is
12272 --------------------------------------
12273 -- Is_Unchecked_Conversion_Instance --
12274 --------------------------------------
12276 function Is_Unchecked_Conversion_Instance
(Id
: Entity_Id
) return Boolean is
12277 Gen_Par
: Entity_Id
;
12280 -- Look for a function whose generic parent is the predefined intrinsic
12281 -- function Unchecked_Conversion.
12283 if Ekind
(Id
) = E_Function
then
12284 Gen_Par
:= Generic_Parent
(Parent
(Id
));
12288 and then Chars
(Gen_Par
) = Name_Unchecked_Conversion
12289 and then Is_Intrinsic_Subprogram
(Gen_Par
)
12290 and then Is_Predefined_File_Name
12291 (Unit_File_Name
(Get_Source_Unit
(Gen_Par
)));
12295 end Is_Unchecked_Conversion_Instance
;
12297 -------------------------------
12298 -- Is_Universal_Numeric_Type --
12299 -------------------------------
12301 function Is_Universal_Numeric_Type
(T
: Entity_Id
) return Boolean is
12303 return T
= Universal_Integer
or else T
= Universal_Real
;
12304 end Is_Universal_Numeric_Type
;
12306 -------------------
12307 -- Is_Value_Type --
12308 -------------------
12310 function Is_Value_Type
(T
: Entity_Id
) return Boolean is
12312 return VM_Target
= CLI_Target
12313 and then Nkind
(T
) in N_Has_Chars
12314 and then Chars
(T
) /= No_Name
12315 and then Get_Name_String
(Chars
(T
)) = "valuetype";
12318 ----------------------------
12319 -- Is_Variable_Size_Array --
12320 ----------------------------
12322 function Is_Variable_Size_Array
(E
: Entity_Id
) return Boolean is
12326 pragma Assert
(Is_Array_Type
(E
));
12328 -- Check if some index is initialized with a non-constant value
12330 Idx
:= First_Index
(E
);
12331 while Present
(Idx
) loop
12332 if Nkind
(Idx
) = N_Range
then
12333 if not Is_Constant_Bound
(Low_Bound
(Idx
))
12334 or else not Is_Constant_Bound
(High_Bound
(Idx
))
12340 Idx
:= Next_Index
(Idx
);
12344 end Is_Variable_Size_Array
;
12346 -----------------------------
12347 -- Is_Variable_Size_Record --
12348 -----------------------------
12350 function Is_Variable_Size_Record
(E
: Entity_Id
) return Boolean is
12352 Comp_Typ
: Entity_Id
;
12355 pragma Assert
(Is_Record_Type
(E
));
12357 Comp
:= First_Entity
(E
);
12358 while Present
(Comp
) loop
12359 Comp_Typ
:= Etype
(Comp
);
12361 -- Recursive call if the record type has discriminants
12363 if Is_Record_Type
(Comp_Typ
)
12364 and then Has_Discriminants
(Comp_Typ
)
12365 and then Is_Variable_Size_Record
(Comp_Typ
)
12369 elsif Is_Array_Type
(Comp_Typ
)
12370 and then Is_Variable_Size_Array
(Comp_Typ
)
12375 Next_Entity
(Comp
);
12379 end Is_Variable_Size_Record
;
12385 function Is_Variable
12387 Use_Original_Node
: Boolean := True) return Boolean
12389 Orig_Node
: Node_Id
;
12391 function In_Protected_Function
(E
: Entity_Id
) return Boolean;
12392 -- Within a protected function, the private components of the enclosing
12393 -- protected type are constants. A function nested within a (protected)
12394 -- procedure is not itself protected. Within the body of a protected
12395 -- function the current instance of the protected type is a constant.
12397 function Is_Variable_Prefix
(P
: Node_Id
) return Boolean;
12398 -- Prefixes can involve implicit dereferences, in which case we must
12399 -- test for the case of a reference of a constant access type, which can
12400 -- can never be a variable.
12402 ---------------------------
12403 -- In_Protected_Function --
12404 ---------------------------
12406 function In_Protected_Function
(E
: Entity_Id
) return Boolean is
12411 -- E is the current instance of a type
12413 if Is_Type
(E
) then
12422 if not Is_Protected_Type
(Prot
) then
12426 S
:= Current_Scope
;
12427 while Present
(S
) and then S
/= Prot
loop
12428 if Ekind
(S
) = E_Function
and then Scope
(S
) = Prot
then
12437 end In_Protected_Function
;
12439 ------------------------
12440 -- Is_Variable_Prefix --
12441 ------------------------
12443 function Is_Variable_Prefix
(P
: Node_Id
) return Boolean is
12445 if Is_Access_Type
(Etype
(P
)) then
12446 return not Is_Access_Constant
(Root_Type
(Etype
(P
)));
12448 -- For the case of an indexed component whose prefix has a packed
12449 -- array type, the prefix has been rewritten into a type conversion.
12450 -- Determine variable-ness from the converted expression.
12452 elsif Nkind
(P
) = N_Type_Conversion
12453 and then not Comes_From_Source
(P
)
12454 and then Is_Array_Type
(Etype
(P
))
12455 and then Is_Packed
(Etype
(P
))
12457 return Is_Variable
(Expression
(P
));
12460 return Is_Variable
(P
);
12462 end Is_Variable_Prefix
;
12464 -- Start of processing for Is_Variable
12467 -- Check if we perform the test on the original node since this may be a
12468 -- test of syntactic categories which must not be disturbed by whatever
12469 -- rewriting might have occurred. For example, an aggregate, which is
12470 -- certainly NOT a variable, could be turned into a variable by
12473 if Use_Original_Node
then
12474 Orig_Node
:= Original_Node
(N
);
12479 -- Definitely OK if Assignment_OK is set. Since this is something that
12480 -- only gets set for expanded nodes, the test is on N, not Orig_Node.
12482 if Nkind
(N
) in N_Subexpr
and then Assignment_OK
(N
) then
12485 -- Normally we go to the original node, but there is one exception where
12486 -- we use the rewritten node, namely when it is an explicit dereference.
12487 -- The generated code may rewrite a prefix which is an access type with
12488 -- an explicit dereference. The dereference is a variable, even though
12489 -- the original node may not be (since it could be a constant of the
12492 -- In Ada 2005 we have a further case to consider: the prefix may be a
12493 -- function call given in prefix notation. The original node appears to
12494 -- be a selected component, but we need to examine the call.
12496 elsif Nkind
(N
) = N_Explicit_Dereference
12497 and then Nkind
(Orig_Node
) /= N_Explicit_Dereference
12498 and then Present
(Etype
(Orig_Node
))
12499 and then Is_Access_Type
(Etype
(Orig_Node
))
12501 -- Note that if the prefix is an explicit dereference that does not
12502 -- come from source, we must check for a rewritten function call in
12503 -- prefixed notation before other forms of rewriting, to prevent a
12507 (Nkind
(Orig_Node
) = N_Function_Call
12508 and then not Is_Access_Constant
(Etype
(Prefix
(N
))))
12510 Is_Variable_Prefix
(Original_Node
(Prefix
(N
)));
12512 -- in Ada 2012, the dereference may have been added for a type with
12513 -- a declared implicit dereference aspect.
12515 elsif Nkind
(N
) = N_Explicit_Dereference
12516 and then Present
(Etype
(Orig_Node
))
12517 and then Ada_Version
>= Ada_2012
12518 and then Has_Implicit_Dereference
(Etype
(Orig_Node
))
12522 -- A function call is never a variable
12524 elsif Nkind
(N
) = N_Function_Call
then
12527 -- All remaining checks use the original node
12529 elsif Is_Entity_Name
(Orig_Node
)
12530 and then Present
(Entity
(Orig_Node
))
12533 E
: constant Entity_Id
:= Entity
(Orig_Node
);
12534 K
: constant Entity_Kind
:= Ekind
(E
);
12537 return (K
= E_Variable
12538 and then Nkind
(Parent
(E
)) /= N_Exception_Handler
)
12539 or else (K
= E_Component
12540 and then not In_Protected_Function
(E
))
12541 or else K
= E_Out_Parameter
12542 or else K
= E_In_Out_Parameter
12543 or else K
= E_Generic_In_Out_Parameter
12545 -- Current instance of type. If this is a protected type, check
12546 -- we are not within the body of one of its protected functions.
12548 or else (Is_Type
(E
)
12549 and then In_Open_Scopes
(E
)
12550 and then not In_Protected_Function
(E
))
12552 or else (Is_Incomplete_Or_Private_Type
(E
)
12553 and then In_Open_Scopes
(Full_View
(E
)));
12557 case Nkind
(Orig_Node
) is
12558 when N_Indexed_Component | N_Slice
=>
12559 return Is_Variable_Prefix
(Prefix
(Orig_Node
));
12561 when N_Selected_Component
=>
12562 return (Is_Variable
(Selector_Name
(Orig_Node
))
12563 and then Is_Variable_Prefix
(Prefix
(Orig_Node
)))
12565 (Nkind
(N
) = N_Expanded_Name
12566 and then Scope
(Entity
(N
)) = Entity
(Prefix
(N
)));
12568 -- For an explicit dereference, the type of the prefix cannot
12569 -- be an access to constant or an access to subprogram.
12571 when N_Explicit_Dereference
=>
12573 Typ
: constant Entity_Id
:= Etype
(Prefix
(Orig_Node
));
12575 return Is_Access_Type
(Typ
)
12576 and then not Is_Access_Constant
(Root_Type
(Typ
))
12577 and then Ekind
(Typ
) /= E_Access_Subprogram_Type
;
12580 -- The type conversion is the case where we do not deal with the
12581 -- context dependent special case of an actual parameter. Thus
12582 -- the type conversion is only considered a variable for the
12583 -- purposes of this routine if the target type is tagged. However,
12584 -- a type conversion is considered to be a variable if it does not
12585 -- come from source (this deals for example with the conversions
12586 -- of expressions to their actual subtypes).
12588 when N_Type_Conversion
=>
12589 return Is_Variable
(Expression
(Orig_Node
))
12591 (not Comes_From_Source
(Orig_Node
)
12593 (Is_Tagged_Type
(Etype
(Subtype_Mark
(Orig_Node
)))
12595 Is_Tagged_Type
(Etype
(Expression
(Orig_Node
)))));
12597 -- GNAT allows an unchecked type conversion as a variable. This
12598 -- only affects the generation of internal expanded code, since
12599 -- calls to instantiations of Unchecked_Conversion are never
12600 -- considered variables (since they are function calls).
12602 when N_Unchecked_Type_Conversion
=>
12603 return Is_Variable
(Expression
(Orig_Node
));
12611 ---------------------------
12612 -- Is_Visibly_Controlled --
12613 ---------------------------
12615 function Is_Visibly_Controlled
(T
: Entity_Id
) return Boolean is
12616 Root
: constant Entity_Id
:= Root_Type
(T
);
12618 return Chars
(Scope
(Root
)) = Name_Finalization
12619 and then Chars
(Scope
(Scope
(Root
))) = Name_Ada
12620 and then Scope
(Scope
(Scope
(Root
))) = Standard_Standard
;
12621 end Is_Visibly_Controlled
;
12623 ------------------------
12624 -- Is_Volatile_Object --
12625 ------------------------
12627 function Is_Volatile_Object
(N
: Node_Id
) return Boolean is
12629 function Is_Volatile_Prefix
(N
: Node_Id
) return Boolean;
12630 -- If prefix is an implicit dereference, examine designated type
12632 function Object_Has_Volatile_Components
(N
: Node_Id
) return Boolean;
12633 -- Determines if given object has volatile components
12635 ------------------------
12636 -- Is_Volatile_Prefix --
12637 ------------------------
12639 function Is_Volatile_Prefix
(N
: Node_Id
) return Boolean is
12640 Typ
: constant Entity_Id
:= Etype
(N
);
12643 if Is_Access_Type
(Typ
) then
12645 Dtyp
: constant Entity_Id
:= Designated_Type
(Typ
);
12648 return Is_Volatile
(Dtyp
)
12649 or else Has_Volatile_Components
(Dtyp
);
12653 return Object_Has_Volatile_Components
(N
);
12655 end Is_Volatile_Prefix
;
12657 ------------------------------------
12658 -- Object_Has_Volatile_Components --
12659 ------------------------------------
12661 function Object_Has_Volatile_Components
(N
: Node_Id
) return Boolean is
12662 Typ
: constant Entity_Id
:= Etype
(N
);
12665 if Is_Volatile
(Typ
)
12666 or else Has_Volatile_Components
(Typ
)
12670 elsif Is_Entity_Name
(N
)
12671 and then (Has_Volatile_Components
(Entity
(N
))
12672 or else Is_Volatile
(Entity
(N
)))
12676 elsif Nkind
(N
) = N_Indexed_Component
12677 or else Nkind
(N
) = N_Selected_Component
12679 return Is_Volatile_Prefix
(Prefix
(N
));
12684 end Object_Has_Volatile_Components
;
12686 -- Start of processing for Is_Volatile_Object
12689 if Nkind
(N
) = N_Defining_Identifier
then
12690 return Is_Volatile
(N
) or else Is_Volatile
(Etype
(N
));
12692 elsif Nkind
(N
) = N_Expanded_Name
then
12693 return Is_Volatile_Object
(Entity
(N
));
12695 elsif Is_Volatile
(Etype
(N
))
12696 or else (Is_Entity_Name
(N
) and then Is_Volatile
(Entity
(N
)))
12700 elsif Nkind_In
(N
, N_Indexed_Component
, N_Selected_Component
)
12701 and then Is_Volatile_Prefix
(Prefix
(N
))
12705 elsif Nkind
(N
) = N_Selected_Component
12706 and then Is_Volatile
(Entity
(Selector_Name
(N
)))
12713 end Is_Volatile_Object
;
12715 ---------------------------
12716 -- Itype_Has_Declaration --
12717 ---------------------------
12719 function Itype_Has_Declaration
(Id
: Entity_Id
) return Boolean is
12721 pragma Assert
(Is_Itype
(Id
));
12722 return Present
(Parent
(Id
))
12723 and then Nkind_In
(Parent
(Id
), N_Full_Type_Declaration
,
12724 N_Subtype_Declaration
)
12725 and then Defining_Entity
(Parent
(Id
)) = Id
;
12726 end Itype_Has_Declaration
;
12728 -------------------------
12729 -- Kill_Current_Values --
12730 -------------------------
12732 procedure Kill_Current_Values
12734 Last_Assignment_Only
: Boolean := False)
12737 if Is_Assignable
(Ent
) then
12738 Set_Last_Assignment
(Ent
, Empty
);
12741 if Is_Object
(Ent
) then
12742 if not Last_Assignment_Only
then
12744 Set_Current_Value
(Ent
, Empty
);
12746 if not Can_Never_Be_Null
(Ent
) then
12747 Set_Is_Known_Non_Null
(Ent
, False);
12750 Set_Is_Known_Null
(Ent
, False);
12752 -- Reset Is_Known_Valid unless type is always valid, or if we have
12753 -- a loop parameter (loop parameters are always valid, since their
12754 -- bounds are defined by the bounds given in the loop header).
12756 if not Is_Known_Valid
(Etype
(Ent
))
12757 and then Ekind
(Ent
) /= E_Loop_Parameter
12759 Set_Is_Known_Valid
(Ent
, False);
12763 end Kill_Current_Values
;
12765 procedure Kill_Current_Values
(Last_Assignment_Only
: Boolean := False) is
12768 procedure Kill_Current_Values_For_Entity_Chain
(E
: Entity_Id
);
12769 -- Clear current value for entity E and all entities chained to E
12771 ------------------------------------------
12772 -- Kill_Current_Values_For_Entity_Chain --
12773 ------------------------------------------
12775 procedure Kill_Current_Values_For_Entity_Chain
(E
: Entity_Id
) is
12779 while Present
(Ent
) loop
12780 Kill_Current_Values
(Ent
, Last_Assignment_Only
);
12783 end Kill_Current_Values_For_Entity_Chain
;
12785 -- Start of processing for Kill_Current_Values
12788 -- Kill all saved checks, a special case of killing saved values
12790 if not Last_Assignment_Only
then
12794 -- Loop through relevant scopes, which includes the current scope and
12795 -- any parent scopes if the current scope is a block or a package.
12797 S
:= Current_Scope
;
12800 -- Clear current values of all entities in current scope
12802 Kill_Current_Values_For_Entity_Chain
(First_Entity
(S
));
12804 -- If scope is a package, also clear current values of all private
12805 -- entities in the scope.
12807 if Is_Package_Or_Generic_Package
(S
)
12808 or else Is_Concurrent_Type
(S
)
12810 Kill_Current_Values_For_Entity_Chain
(First_Private_Entity
(S
));
12813 -- If this is a not a subprogram, deal with parents
12815 if not Is_Subprogram
(S
) then
12817 exit Scope_Loop
when S
= Standard_Standard
;
12821 end loop Scope_Loop
;
12822 end Kill_Current_Values
;
12824 --------------------------
12825 -- Kill_Size_Check_Code --
12826 --------------------------
12828 procedure Kill_Size_Check_Code
(E
: Entity_Id
) is
12830 if (Ekind
(E
) = E_Constant
or else Ekind
(E
) = E_Variable
)
12831 and then Present
(Size_Check_Code
(E
))
12833 Remove
(Size_Check_Code
(E
));
12834 Set_Size_Check_Code
(E
, Empty
);
12836 end Kill_Size_Check_Code
;
12838 --------------------------
12839 -- Known_To_Be_Assigned --
12840 --------------------------
12842 function Known_To_Be_Assigned
(N
: Node_Id
) return Boolean is
12843 P
: constant Node_Id
:= Parent
(N
);
12848 -- Test left side of assignment
12850 when N_Assignment_Statement
=>
12851 return N
= Name
(P
);
12853 -- Function call arguments are never lvalues
12855 when N_Function_Call
=>
12858 -- Positional parameter for procedure or accept call
12860 when N_Procedure_Call_Statement |
12869 Proc
:= Get_Subprogram_Entity
(P
);
12875 -- If we are not a list member, something is strange, so
12876 -- be conservative and return False.
12878 if not Is_List_Member
(N
) then
12882 -- We are going to find the right formal by stepping forward
12883 -- through the formals, as we step backwards in the actuals.
12885 Form
:= First_Formal
(Proc
);
12888 -- If no formal, something is weird, so be conservative
12889 -- and return False.
12896 exit when No
(Act
);
12897 Next_Formal
(Form
);
12900 return Ekind
(Form
) /= E_In_Parameter
;
12903 -- Named parameter for procedure or accept call
12905 when N_Parameter_Association
=>
12911 Proc
:= Get_Subprogram_Entity
(Parent
(P
));
12917 -- Loop through formals to find the one that matches
12919 Form
:= First_Formal
(Proc
);
12921 -- If no matching formal, that's peculiar, some kind of
12922 -- previous error, so return False to be conservative.
12923 -- Actually this also happens in legal code in the case
12924 -- where P is a parameter association for an Extra_Formal???
12930 -- Else test for match
12932 if Chars
(Form
) = Chars
(Selector_Name
(P
)) then
12933 return Ekind
(Form
) /= E_In_Parameter
;
12936 Next_Formal
(Form
);
12940 -- Test for appearing in a conversion that itself appears
12941 -- in an lvalue context, since this should be an lvalue.
12943 when N_Type_Conversion
=>
12944 return Known_To_Be_Assigned
(P
);
12946 -- All other references are definitely not known to be modifications
12952 end Known_To_Be_Assigned
;
12954 ---------------------------
12955 -- Last_Source_Statement --
12956 ---------------------------
12958 function Last_Source_Statement
(HSS
: Node_Id
) return Node_Id
is
12962 N
:= Last
(Statements
(HSS
));
12963 while Present
(N
) loop
12964 exit when Comes_From_Source
(N
);
12969 end Last_Source_Statement
;
12971 ----------------------------------
12972 -- Matching_Static_Array_Bounds --
12973 ----------------------------------
12975 function Matching_Static_Array_Bounds
12977 R_Typ
: Node_Id
) return Boolean
12979 L_Ndims
: constant Nat
:= Number_Dimensions
(L_Typ
);
12980 R_Ndims
: constant Nat
:= Number_Dimensions
(R_Typ
);
12992 if L_Ndims
/= R_Ndims
then
12996 -- Unconstrained types do not have static bounds
12998 if not Is_Constrained
(L_Typ
) or else not Is_Constrained
(R_Typ
) then
13002 -- First treat specially the first dimension, as the lower bound and
13003 -- length of string literals are not stored like those of arrays.
13005 if Ekind
(L_Typ
) = E_String_Literal_Subtype
then
13006 L_Low
:= String_Literal_Low_Bound
(L_Typ
);
13007 L_Len
:= String_Literal_Length
(L_Typ
);
13009 L_Index
:= First_Index
(L_Typ
);
13010 Get_Index_Bounds
(L_Index
, L_Low
, L_High
);
13012 if Is_OK_Static_Expression
(L_Low
)
13014 Is_OK_Static_Expression
(L_High
)
13016 if Expr_Value
(L_High
) < Expr_Value
(L_Low
) then
13019 L_Len
:= (Expr_Value
(L_High
) - Expr_Value
(L_Low
)) + 1;
13026 if Ekind
(R_Typ
) = E_String_Literal_Subtype
then
13027 R_Low
:= String_Literal_Low_Bound
(R_Typ
);
13028 R_Len
:= String_Literal_Length
(R_Typ
);
13030 R_Index
:= First_Index
(R_Typ
);
13031 Get_Index_Bounds
(R_Index
, R_Low
, R_High
);
13033 if Is_OK_Static_Expression
(R_Low
)
13035 Is_OK_Static_Expression
(R_High
)
13037 if Expr_Value
(R_High
) < Expr_Value
(R_Low
) then
13040 R_Len
:= (Expr_Value
(R_High
) - Expr_Value
(R_Low
)) + 1;
13047 if (Is_OK_Static_Expression
(L_Low
)
13049 Is_OK_Static_Expression
(R_Low
))
13050 and then Expr_Value
(L_Low
) = Expr_Value
(R_Low
)
13051 and then L_Len
= R_Len
13058 -- Then treat all other dimensions
13060 for Indx
in 2 .. L_Ndims
loop
13064 Get_Index_Bounds
(L_Index
, L_Low
, L_High
);
13065 Get_Index_Bounds
(R_Index
, R_Low
, R_High
);
13067 if (Is_OK_Static_Expression
(L_Low
) and then
13068 Is_OK_Static_Expression
(L_High
) and then
13069 Is_OK_Static_Expression
(R_Low
) and then
13070 Is_OK_Static_Expression
(R_High
))
13071 and then (Expr_Value
(L_Low
) = Expr_Value
(R_Low
)
13073 Expr_Value
(L_High
) = Expr_Value
(R_High
))
13081 -- If we fall through the loop, all indexes matched
13084 end Matching_Static_Array_Bounds
;
13086 -------------------
13087 -- May_Be_Lvalue --
13088 -------------------
13090 function May_Be_Lvalue
(N
: Node_Id
) return Boolean is
13091 P
: constant Node_Id
:= Parent
(N
);
13096 -- Test left side of assignment
13098 when N_Assignment_Statement
=>
13099 return N
= Name
(P
);
13101 -- Test prefix of component or attribute. Note that the prefix of an
13102 -- explicit or implicit dereference cannot be an l-value.
13104 when N_Attribute_Reference
=>
13105 return N
= Prefix
(P
)
13106 and then Name_Implies_Lvalue_Prefix
(Attribute_Name
(P
));
13108 -- For an expanded name, the name is an lvalue if the expanded name
13109 -- is an lvalue, but the prefix is never an lvalue, since it is just
13110 -- the scope where the name is found.
13112 when N_Expanded_Name
=>
13113 if N
= Prefix
(P
) then
13114 return May_Be_Lvalue
(P
);
13119 -- For a selected component A.B, A is certainly an lvalue if A.B is.
13120 -- B is a little interesting, if we have A.B := 3, there is some
13121 -- discussion as to whether B is an lvalue or not, we choose to say
13122 -- it is. Note however that A is not an lvalue if it is of an access
13123 -- type since this is an implicit dereference.
13125 when N_Selected_Component
=>
13127 and then Present
(Etype
(N
))
13128 and then Is_Access_Type
(Etype
(N
))
13132 return May_Be_Lvalue
(P
);
13135 -- For an indexed component or slice, the index or slice bounds is
13136 -- never an lvalue. The prefix is an lvalue if the indexed component
13137 -- or slice is an lvalue, except if it is an access type, where we
13138 -- have an implicit dereference.
13140 when N_Indexed_Component | N_Slice
=>
13142 or else (Present
(Etype
(N
)) and then Is_Access_Type
(Etype
(N
)))
13146 return May_Be_Lvalue
(P
);
13149 -- Prefix of a reference is an lvalue if the reference is an lvalue
13151 when N_Reference
=>
13152 return May_Be_Lvalue
(P
);
13154 -- Prefix of explicit dereference is never an lvalue
13156 when N_Explicit_Dereference
=>
13159 -- Positional parameter for subprogram, entry, or accept call.
13160 -- In older versions of Ada function call arguments are never
13161 -- lvalues. In Ada 2012 functions can have in-out parameters.
13163 when N_Subprogram_Call |
13164 N_Entry_Call_Statement |
13167 if Nkind
(P
) = N_Function_Call
and then Ada_Version
< Ada_2012
then
13171 -- The following mechanism is clumsy and fragile. A single flag
13172 -- set in Resolve_Actuals would be preferable ???
13180 Proc
:= Get_Subprogram_Entity
(P
);
13186 -- If we are not a list member, something is strange, so be
13187 -- conservative and return True.
13189 if not Is_List_Member
(N
) then
13193 -- We are going to find the right formal by stepping forward
13194 -- through the formals, as we step backwards in the actuals.
13196 Form
:= First_Formal
(Proc
);
13199 -- If no formal, something is weird, so be conservative and
13207 exit when No
(Act
);
13208 Next_Formal
(Form
);
13211 return Ekind
(Form
) /= E_In_Parameter
;
13214 -- Named parameter for procedure or accept call
13216 when N_Parameter_Association
=>
13222 Proc
:= Get_Subprogram_Entity
(Parent
(P
));
13228 -- Loop through formals to find the one that matches
13230 Form
:= First_Formal
(Proc
);
13232 -- If no matching formal, that's peculiar, some kind of
13233 -- previous error, so return True to be conservative.
13234 -- Actually happens with legal code for an unresolved call
13235 -- where we may get the wrong homonym???
13241 -- Else test for match
13243 if Chars
(Form
) = Chars
(Selector_Name
(P
)) then
13244 return Ekind
(Form
) /= E_In_Parameter
;
13247 Next_Formal
(Form
);
13251 -- Test for appearing in a conversion that itself appears in an
13252 -- lvalue context, since this should be an lvalue.
13254 when N_Type_Conversion
=>
13255 return May_Be_Lvalue
(P
);
13257 -- Test for appearance in object renaming declaration
13259 when N_Object_Renaming_Declaration
=>
13262 -- All other references are definitely not lvalues
13270 -----------------------
13271 -- Mark_Coextensions --
13272 -----------------------
13274 procedure Mark_Coextensions
(Context_Nod
: Node_Id
; Root_Nod
: Node_Id
) is
13275 Is_Dynamic
: Boolean;
13276 -- Indicates whether the context causes nested coextensions to be
13277 -- dynamic or static
13279 function Mark_Allocator
(N
: Node_Id
) return Traverse_Result
;
13280 -- Recognize an allocator node and label it as a dynamic coextension
13282 --------------------
13283 -- Mark_Allocator --
13284 --------------------
13286 function Mark_Allocator
(N
: Node_Id
) return Traverse_Result
is
13288 if Nkind
(N
) = N_Allocator
then
13290 Set_Is_Dynamic_Coextension
(N
);
13292 -- If the allocator expression is potentially dynamic, it may
13293 -- be expanded out of order and require dynamic allocation
13294 -- anyway, so we treat the coextension itself as dynamic.
13295 -- Potential optimization ???
13297 elsif Nkind
(Expression
(N
)) = N_Qualified_Expression
13298 and then Nkind
(Expression
(Expression
(N
))) = N_Op_Concat
13300 Set_Is_Dynamic_Coextension
(N
);
13302 Set_Is_Static_Coextension
(N
);
13307 end Mark_Allocator
;
13309 procedure Mark_Allocators
is new Traverse_Proc
(Mark_Allocator
);
13311 -- Start of processing Mark_Coextensions
13314 case Nkind
(Context_Nod
) is
13316 -- Comment here ???
13318 when N_Assignment_Statement
=>
13319 Is_Dynamic
:= Nkind
(Expression
(Context_Nod
)) = N_Allocator
;
13321 -- An allocator that is a component of a returned aggregate
13322 -- must be dynamic.
13324 when N_Simple_Return_Statement
=>
13326 Expr
: constant Node_Id
:= Expression
(Context_Nod
);
13329 Nkind
(Expr
) = N_Allocator
13331 (Nkind
(Expr
) = N_Qualified_Expression
13332 and then Nkind
(Expression
(Expr
)) = N_Aggregate
);
13335 -- An alloctor within an object declaration in an extended return
13336 -- statement is of necessity dynamic.
13338 when N_Object_Declaration
=>
13339 Is_Dynamic
:= Nkind
(Root_Nod
) = N_Allocator
13341 Nkind
(Parent
(Context_Nod
)) = N_Extended_Return_Statement
;
13343 -- This routine should not be called for constructs which may not
13344 -- contain coextensions.
13347 raise Program_Error
;
13350 Mark_Allocators
(Root_Nod
);
13351 end Mark_Coextensions
;
13357 function Must_Inline
(Subp
: Entity_Id
) return Boolean is
13360 (Optimization_Level
= 0
13362 -- AAMP and VM targets have no support for inlining in the backend.
13363 -- Hence we do as much inlining as possible in the front end.
13365 or else AAMP_On_Target
13366 or else VM_Target
/= No_VM
)
13367 and then Has_Pragma_Inline
(Subp
)
13368 and then (Has_Pragma_Inline_Always
(Subp
) or else Front_End_Inlining
);
13371 ----------------------
13372 -- Needs_One_Actual --
13373 ----------------------
13375 function Needs_One_Actual
(E
: Entity_Id
) return Boolean is
13376 Formal
: Entity_Id
;
13379 -- Ada 2005 or later, and formals present
13381 if Ada_Version
>= Ada_2005
and then Present
(First_Formal
(E
)) then
13382 Formal
:= Next_Formal
(First_Formal
(E
));
13383 while Present
(Formal
) loop
13384 if No
(Default_Value
(Formal
)) then
13388 Next_Formal
(Formal
);
13393 -- Ada 83/95 or no formals
13398 end Needs_One_Actual
;
13400 ------------------------
13401 -- New_Copy_List_Tree --
13402 ------------------------
13404 function New_Copy_List_Tree
(List
: List_Id
) return List_Id
is
13409 if List
= No_List
then
13416 while Present
(E
) loop
13417 Append
(New_Copy_Tree
(E
), NL
);
13423 end New_Copy_List_Tree
;
13425 --------------------------------------------------
13426 -- New_Copy_Tree Auxiliary Data and Subprograms --
13427 --------------------------------------------------
13429 use Atree
.Unchecked_Access
;
13430 use Atree_Private_Part
;
13432 -- Our approach here requires a two pass traversal of the tree. The
13433 -- first pass visits all nodes that eventually will be copied looking
13434 -- for defining Itypes. If any defining Itypes are found, then they are
13435 -- copied, and an entry is added to the replacement map. In the second
13436 -- phase, the tree is copied, using the replacement map to replace any
13437 -- Itype references within the copied tree.
13439 -- The following hash tables are used if the Map supplied has more
13440 -- than hash threshold entries to speed up access to the map. If
13441 -- there are fewer entries, then the map is searched sequentially
13442 -- (because setting up a hash table for only a few entries takes
13443 -- more time than it saves.
13445 function New_Copy_Hash
(E
: Entity_Id
) return NCT_Header_Num
;
13446 -- Hash function used for hash operations
13448 -------------------
13449 -- New_Copy_Hash --
13450 -------------------
13452 function New_Copy_Hash
(E
: Entity_Id
) return NCT_Header_Num
is
13454 return Nat
(E
) mod (NCT_Header_Num
'Last + 1);
13461 -- The hash table NCT_Assoc associates old entities in the table
13462 -- with their corresponding new entities (i.e. the pairs of entries
13463 -- presented in the original Map argument are Key-Element pairs).
13465 package NCT_Assoc
is new Simple_HTable
(
13466 Header_Num
=> NCT_Header_Num
,
13467 Element
=> Entity_Id
,
13468 No_Element
=> Empty
,
13470 Hash
=> New_Copy_Hash
,
13471 Equal
=> Types
."=");
13473 ---------------------
13474 -- NCT_Itype_Assoc --
13475 ---------------------
13477 -- The hash table NCT_Itype_Assoc contains entries only for those
13478 -- old nodes which have a non-empty Associated_Node_For_Itype set.
13479 -- The key is the associated node, and the element is the new node
13480 -- itself (NOT the associated node for the new node).
13482 package NCT_Itype_Assoc
is new Simple_HTable
(
13483 Header_Num
=> NCT_Header_Num
,
13484 Element
=> Entity_Id
,
13485 No_Element
=> Empty
,
13487 Hash
=> New_Copy_Hash
,
13488 Equal
=> Types
."=");
13490 -------------------
13491 -- New_Copy_Tree --
13492 -------------------
13494 function New_Copy_Tree
13496 Map
: Elist_Id
:= No_Elist
;
13497 New_Sloc
: Source_Ptr
:= No_Location
;
13498 New_Scope
: Entity_Id
:= Empty
) return Node_Id
13500 Actual_Map
: Elist_Id
:= Map
;
13501 -- This is the actual map for the copy. It is initialized with the
13502 -- given elements, and then enlarged as required for Itypes that are
13503 -- copied during the first phase of the copy operation. The visit
13504 -- procedures add elements to this map as Itypes are encountered.
13505 -- The reason we cannot use Map directly, is that it may well be
13506 -- (and normally is) initialized to No_Elist, and if we have mapped
13507 -- entities, we have to reset it to point to a real Elist.
13509 function Assoc
(N
: Node_Or_Entity_Id
) return Node_Id
;
13510 -- Called during second phase to map entities into their corresponding
13511 -- copies using Actual_Map. If the argument is not an entity, or is not
13512 -- in Actual_Map, then it is returned unchanged.
13514 procedure Build_NCT_Hash_Tables
;
13515 -- Builds hash tables (number of elements >= threshold value)
13517 function Copy_Elist_With_Replacement
13518 (Old_Elist
: Elist_Id
) return Elist_Id
;
13519 -- Called during second phase to copy element list doing replacements
13521 procedure Copy_Itype_With_Replacement
(New_Itype
: Entity_Id
);
13522 -- Called during the second phase to process a copied Itype. The actual
13523 -- copy happened during the first phase (so that we could make the entry
13524 -- in the mapping), but we still have to deal with the descendents of
13525 -- the copied Itype and copy them where necessary.
13527 function Copy_List_With_Replacement
(Old_List
: List_Id
) return List_Id
;
13528 -- Called during second phase to copy list doing replacements
13530 function Copy_Node_With_Replacement
(Old_Node
: Node_Id
) return Node_Id
;
13531 -- Called during second phase to copy node doing replacements
13533 procedure Visit_Elist
(E
: Elist_Id
);
13534 -- Called during first phase to visit all elements of an Elist
13536 procedure Visit_Field
(F
: Union_Id
; N
: Node_Id
);
13537 -- Visit a single field, recursing to call Visit_Node or Visit_List
13538 -- if the field is a syntactic descendent of the current node (i.e.
13539 -- its parent is Node N).
13541 procedure Visit_Itype
(Old_Itype
: Entity_Id
);
13542 -- Called during first phase to visit subsidiary fields of a defining
13543 -- Itype, and also create a copy and make an entry in the replacement
13544 -- map for the new copy.
13546 procedure Visit_List
(L
: List_Id
);
13547 -- Called during first phase to visit all elements of a List
13549 procedure Visit_Node
(N
: Node_Or_Entity_Id
);
13550 -- Called during first phase to visit a node and all its subtrees
13556 function Assoc
(N
: Node_Or_Entity_Id
) return Node_Id
is
13561 if not Has_Extension
(N
) or else No
(Actual_Map
) then
13564 elsif NCT_Hash_Tables_Used
then
13565 Ent
:= NCT_Assoc
.Get
(Entity_Id
(N
));
13567 if Present
(Ent
) then
13573 -- No hash table used, do serial search
13576 E
:= First_Elmt
(Actual_Map
);
13577 while Present
(E
) loop
13578 if Node
(E
) = N
then
13579 return Node
(Next_Elmt
(E
));
13581 E
:= Next_Elmt
(Next_Elmt
(E
));
13589 ---------------------------
13590 -- Build_NCT_Hash_Tables --
13591 ---------------------------
13593 procedure Build_NCT_Hash_Tables
is
13597 if NCT_Hash_Table_Setup
then
13599 NCT_Itype_Assoc
.Reset
;
13602 Elmt
:= First_Elmt
(Actual_Map
);
13603 while Present
(Elmt
) loop
13604 Ent
:= Node
(Elmt
);
13606 -- Get new entity, and associate old and new
13609 NCT_Assoc
.Set
(Ent
, Node
(Elmt
));
13611 if Is_Type
(Ent
) then
13613 Anode
: constant Entity_Id
:=
13614 Associated_Node_For_Itype
(Ent
);
13617 if Present
(Anode
) then
13619 -- Enter a link between the associated node of the
13620 -- old Itype and the new Itype, for updating later
13621 -- when node is copied.
13623 NCT_Itype_Assoc
.Set
(Anode
, Node
(Elmt
));
13631 NCT_Hash_Tables_Used
:= True;
13632 NCT_Hash_Table_Setup
:= True;
13633 end Build_NCT_Hash_Tables
;
13635 ---------------------------------
13636 -- Copy_Elist_With_Replacement --
13637 ---------------------------------
13639 function Copy_Elist_With_Replacement
13640 (Old_Elist
: Elist_Id
) return Elist_Id
13643 New_Elist
: Elist_Id
;
13646 if No
(Old_Elist
) then
13650 New_Elist
:= New_Elmt_List
;
13652 M
:= First_Elmt
(Old_Elist
);
13653 while Present
(M
) loop
13654 Append_Elmt
(Copy_Node_With_Replacement
(Node
(M
)), New_Elist
);
13660 end Copy_Elist_With_Replacement
;
13662 ---------------------------------
13663 -- Copy_Itype_With_Replacement --
13664 ---------------------------------
13666 -- This routine exactly parallels its phase one analog Visit_Itype,
13668 procedure Copy_Itype_With_Replacement
(New_Itype
: Entity_Id
) is
13670 -- Translate Next_Entity, Scope and Etype fields, in case they
13671 -- reference entities that have been mapped into copies.
13673 Set_Next_Entity
(New_Itype
, Assoc
(Next_Entity
(New_Itype
)));
13674 Set_Etype
(New_Itype
, Assoc
(Etype
(New_Itype
)));
13676 if Present
(New_Scope
) then
13677 Set_Scope
(New_Itype
, New_Scope
);
13679 Set_Scope
(New_Itype
, Assoc
(Scope
(New_Itype
)));
13682 -- Copy referenced fields
13684 if Is_Discrete_Type
(New_Itype
) then
13685 Set_Scalar_Range
(New_Itype
,
13686 Copy_Node_With_Replacement
(Scalar_Range
(New_Itype
)));
13688 elsif Has_Discriminants
(Base_Type
(New_Itype
)) then
13689 Set_Discriminant_Constraint
(New_Itype
,
13690 Copy_Elist_With_Replacement
13691 (Discriminant_Constraint
(New_Itype
)));
13693 elsif Is_Array_Type
(New_Itype
) then
13694 if Present
(First_Index
(New_Itype
)) then
13695 Set_First_Index
(New_Itype
,
13696 First
(Copy_List_With_Replacement
13697 (List_Containing
(First_Index
(New_Itype
)))));
13700 if Is_Packed
(New_Itype
) then
13701 Set_Packed_Array_Impl_Type
(New_Itype
,
13702 Copy_Node_With_Replacement
13703 (Packed_Array_Impl_Type
(New_Itype
)));
13706 end Copy_Itype_With_Replacement
;
13708 --------------------------------
13709 -- Copy_List_With_Replacement --
13710 --------------------------------
13712 function Copy_List_With_Replacement
13713 (Old_List
: List_Id
) return List_Id
13715 New_List
: List_Id
;
13719 if Old_List
= No_List
then
13723 New_List
:= Empty_List
;
13725 E
:= First
(Old_List
);
13726 while Present
(E
) loop
13727 Append
(Copy_Node_With_Replacement
(E
), New_List
);
13733 end Copy_List_With_Replacement
;
13735 --------------------------------
13736 -- Copy_Node_With_Replacement --
13737 --------------------------------
13739 function Copy_Node_With_Replacement
13740 (Old_Node
: Node_Id
) return Node_Id
13742 New_Node
: Node_Id
;
13744 procedure Adjust_Named_Associations
13745 (Old_Node
: Node_Id
;
13746 New_Node
: Node_Id
);
13747 -- If a call node has named associations, these are chained through
13748 -- the First_Named_Actual, Next_Named_Actual links. These must be
13749 -- propagated separately to the new parameter list, because these
13750 -- are not syntactic fields.
13752 function Copy_Field_With_Replacement
13753 (Field
: Union_Id
) return Union_Id
;
13754 -- Given Field, which is a field of Old_Node, return a copy of it
13755 -- if it is a syntactic field (i.e. its parent is Node), setting
13756 -- the parent of the copy to poit to New_Node. Otherwise returns
13757 -- the field (possibly mapped if it is an entity).
13759 -------------------------------
13760 -- Adjust_Named_Associations --
13761 -------------------------------
13763 procedure Adjust_Named_Associations
13764 (Old_Node
: Node_Id
;
13765 New_Node
: Node_Id
)
13770 Old_Next
: Node_Id
;
13771 New_Next
: Node_Id
;
13774 Old_E
:= First
(Parameter_Associations
(Old_Node
));
13775 New_E
:= First
(Parameter_Associations
(New_Node
));
13776 while Present
(Old_E
) loop
13777 if Nkind
(Old_E
) = N_Parameter_Association
13778 and then Present
(Next_Named_Actual
(Old_E
))
13780 if First_Named_Actual
(Old_Node
)
13781 = Explicit_Actual_Parameter
(Old_E
)
13783 Set_First_Named_Actual
13784 (New_Node
, Explicit_Actual_Parameter
(New_E
));
13787 -- Now scan parameter list from the beginning,to locate
13788 -- next named actual, which can be out of order.
13790 Old_Next
:= First
(Parameter_Associations
(Old_Node
));
13791 New_Next
:= First
(Parameter_Associations
(New_Node
));
13793 while Nkind
(Old_Next
) /= N_Parameter_Association
13794 or else Explicit_Actual_Parameter
(Old_Next
)
13795 /= Next_Named_Actual
(Old_E
)
13801 Set_Next_Named_Actual
13802 (New_E
, Explicit_Actual_Parameter
(New_Next
));
13808 end Adjust_Named_Associations
;
13810 ---------------------------------
13811 -- Copy_Field_With_Replacement --
13812 ---------------------------------
13814 function Copy_Field_With_Replacement
13815 (Field
: Union_Id
) return Union_Id
13818 if Field
= Union_Id
(Empty
) then
13821 elsif Field
in Node_Range
then
13823 Old_N
: constant Node_Id
:= Node_Id
(Field
);
13827 -- If syntactic field, as indicated by the parent pointer
13828 -- being set, then copy the referenced node recursively.
13830 if Parent
(Old_N
) = Old_Node
then
13831 New_N
:= Copy_Node_With_Replacement
(Old_N
);
13833 if New_N
/= Old_N
then
13834 Set_Parent
(New_N
, New_Node
);
13837 -- For semantic fields, update possible entity reference
13838 -- from the replacement map.
13841 New_N
:= Assoc
(Old_N
);
13844 return Union_Id
(New_N
);
13847 elsif Field
in List_Range
then
13849 Old_L
: constant List_Id
:= List_Id
(Field
);
13853 -- If syntactic field, as indicated by the parent pointer,
13854 -- then recursively copy the entire referenced list.
13856 if Parent
(Old_L
) = Old_Node
then
13857 New_L
:= Copy_List_With_Replacement
(Old_L
);
13858 Set_Parent
(New_L
, New_Node
);
13860 -- For semantic list, just returned unchanged
13866 return Union_Id
(New_L
);
13869 -- Anything other than a list or a node is returned unchanged
13874 end Copy_Field_With_Replacement
;
13876 -- Start of processing for Copy_Node_With_Replacement
13879 if Old_Node
<= Empty_Or_Error
then
13882 elsif Has_Extension
(Old_Node
) then
13883 return Assoc
(Old_Node
);
13886 New_Node
:= New_Copy
(Old_Node
);
13888 -- If the node we are copying is the associated node of a
13889 -- previously copied Itype, then adjust the associated node
13890 -- of the copy of that Itype accordingly.
13892 if Present
(Actual_Map
) then
13898 -- Case of hash table used
13900 if NCT_Hash_Tables_Used
then
13901 Ent
:= NCT_Itype_Assoc
.Get
(Old_Node
);
13903 if Present
(Ent
) then
13904 Set_Associated_Node_For_Itype
(Ent
, New_Node
);
13907 -- Case of no hash table used
13910 E
:= First_Elmt
(Actual_Map
);
13911 while Present
(E
) loop
13912 if Is_Itype
(Node
(E
))
13914 Old_Node
= Associated_Node_For_Itype
(Node
(E
))
13916 Set_Associated_Node_For_Itype
13917 (Node
(Next_Elmt
(E
)), New_Node
);
13920 E
:= Next_Elmt
(Next_Elmt
(E
));
13926 -- Recursively copy descendents
13929 (New_Node
, Copy_Field_With_Replacement
(Field1
(New_Node
)));
13931 (New_Node
, Copy_Field_With_Replacement
(Field2
(New_Node
)));
13933 (New_Node
, Copy_Field_With_Replacement
(Field3
(New_Node
)));
13935 (New_Node
, Copy_Field_With_Replacement
(Field4
(New_Node
)));
13937 (New_Node
, Copy_Field_With_Replacement
(Field5
(New_Node
)));
13939 -- Adjust Sloc of new node if necessary
13941 if New_Sloc
/= No_Location
then
13942 Set_Sloc
(New_Node
, New_Sloc
);
13944 -- If we adjust the Sloc, then we are essentially making
13945 -- a completely new node, so the Comes_From_Source flag
13946 -- should be reset to the proper default value.
13948 Nodes
.Table
(New_Node
).Comes_From_Source
:=
13949 Default_Node
.Comes_From_Source
;
13952 -- If the node is call and has named associations,
13953 -- set the corresponding links in the copy.
13955 if (Nkind
(Old_Node
) = N_Function_Call
13956 or else Nkind
(Old_Node
) = N_Entry_Call_Statement
13958 Nkind
(Old_Node
) = N_Procedure_Call_Statement
)
13959 and then Present
(First_Named_Actual
(Old_Node
))
13961 Adjust_Named_Associations
(Old_Node
, New_Node
);
13964 -- Reset First_Real_Statement for Handled_Sequence_Of_Statements.
13965 -- The replacement mechanism applies to entities, and is not used
13966 -- here. Eventually we may need a more general graph-copying
13967 -- routine. For now, do a sequential search to find desired node.
13969 if Nkind
(Old_Node
) = N_Handled_Sequence_Of_Statements
13970 and then Present
(First_Real_Statement
(Old_Node
))
13973 Old_F
: constant Node_Id
:= First_Real_Statement
(Old_Node
);
13977 N1
:= First
(Statements
(Old_Node
));
13978 N2
:= First
(Statements
(New_Node
));
13980 while N1
/= Old_F
loop
13985 Set_First_Real_Statement
(New_Node
, N2
);
13990 -- All done, return copied node
13993 end Copy_Node_With_Replacement
;
13999 procedure Visit_Elist
(E
: Elist_Id
) is
14002 if Present
(E
) then
14003 Elmt
:= First_Elmt
(E
);
14005 while Elmt
/= No_Elmt
loop
14006 Visit_Node
(Node
(Elmt
));
14016 procedure Visit_Field
(F
: Union_Id
; N
: Node_Id
) is
14018 if F
= Union_Id
(Empty
) then
14021 elsif F
in Node_Range
then
14023 -- Copy node if it is syntactic, i.e. its parent pointer is
14024 -- set to point to the field that referenced it (certain
14025 -- Itypes will also meet this criterion, which is fine, since
14026 -- these are clearly Itypes that do need to be copied, since
14027 -- we are copying their parent.)
14029 if Parent
(Node_Id
(F
)) = N
then
14030 Visit_Node
(Node_Id
(F
));
14033 -- Another case, if we are pointing to an Itype, then we want
14034 -- to copy it if its associated node is somewhere in the tree
14037 -- Note: the exclusion of self-referential copies is just an
14038 -- optimization, since the search of the already copied list
14039 -- would catch it, but it is a common case (Etype pointing
14040 -- to itself for an Itype that is a base type).
14042 elsif Has_Extension
(Node_Id
(F
))
14043 and then Is_Itype
(Entity_Id
(F
))
14044 and then Node_Id
(F
) /= N
14050 P
:= Associated_Node_For_Itype
(Node_Id
(F
));
14051 while Present
(P
) loop
14053 Visit_Node
(Node_Id
(F
));
14060 -- An Itype whose parent is not being copied definitely
14061 -- should NOT be copied, since it does not belong in any
14062 -- sense to the copied subtree.
14068 elsif F
in List_Range
and then Parent
(List_Id
(F
)) = N
then
14069 Visit_List
(List_Id
(F
));
14078 procedure Visit_Itype
(Old_Itype
: Entity_Id
) is
14079 New_Itype
: Entity_Id
;
14084 -- Itypes that describe the designated type of access to subprograms
14085 -- have the structure of subprogram declarations, with signatures,
14086 -- etc. Either we duplicate the signatures completely, or choose to
14087 -- share such itypes, which is fine because their elaboration will
14088 -- have no side effects.
14090 if Ekind
(Old_Itype
) = E_Subprogram_Type
then
14094 New_Itype
:= New_Copy
(Old_Itype
);
14096 -- The new Itype has all the attributes of the old one, and
14097 -- we just copy the contents of the entity. However, the back-end
14098 -- needs different names for debugging purposes, so we create a
14099 -- new internal name for it in all cases.
14101 Set_Chars
(New_Itype
, New_Internal_Name
('T'));
14103 -- If our associated node is an entity that has already been copied,
14104 -- then set the associated node of the copy to point to the right
14105 -- copy. If we have copied an Itype that is itself the associated
14106 -- node of some previously copied Itype, then we set the right
14107 -- pointer in the other direction.
14109 if Present
(Actual_Map
) then
14111 -- Case of hash tables used
14113 if NCT_Hash_Tables_Used
then
14115 Ent
:= NCT_Assoc
.Get
(Associated_Node_For_Itype
(Old_Itype
));
14117 if Present
(Ent
) then
14118 Set_Associated_Node_For_Itype
(New_Itype
, Ent
);
14121 Ent
:= NCT_Itype_Assoc
.Get
(Old_Itype
);
14122 if Present
(Ent
) then
14123 Set_Associated_Node_For_Itype
(Ent
, New_Itype
);
14125 -- If the hash table has no association for this Itype and
14126 -- its associated node, enter one now.
14129 NCT_Itype_Assoc
.Set
14130 (Associated_Node_For_Itype
(Old_Itype
), New_Itype
);
14133 -- Case of hash tables not used
14136 E
:= First_Elmt
(Actual_Map
);
14137 while Present
(E
) loop
14138 if Associated_Node_For_Itype
(Old_Itype
) = Node
(E
) then
14139 Set_Associated_Node_For_Itype
14140 (New_Itype
, Node
(Next_Elmt
(E
)));
14143 if Is_Type
(Node
(E
))
14144 and then Old_Itype
= Associated_Node_For_Itype
(Node
(E
))
14146 Set_Associated_Node_For_Itype
14147 (Node
(Next_Elmt
(E
)), New_Itype
);
14150 E
:= Next_Elmt
(Next_Elmt
(E
));
14155 if Present
(Freeze_Node
(New_Itype
)) then
14156 Set_Is_Frozen
(New_Itype
, False);
14157 Set_Freeze_Node
(New_Itype
, Empty
);
14160 -- Add new association to map
14162 if No
(Actual_Map
) then
14163 Actual_Map
:= New_Elmt_List
;
14166 Append_Elmt
(Old_Itype
, Actual_Map
);
14167 Append_Elmt
(New_Itype
, Actual_Map
);
14169 if NCT_Hash_Tables_Used
then
14170 NCT_Assoc
.Set
(Old_Itype
, New_Itype
);
14173 NCT_Table_Entries
:= NCT_Table_Entries
+ 1;
14175 if NCT_Table_Entries
> NCT_Hash_Threshold
then
14176 Build_NCT_Hash_Tables
;
14180 -- If a record subtype is simply copied, the entity list will be
14181 -- shared. Thus cloned_Subtype must be set to indicate the sharing.
14183 if Ekind_In
(Old_Itype
, E_Record_Subtype
, E_Class_Wide_Subtype
) then
14184 Set_Cloned_Subtype
(New_Itype
, Old_Itype
);
14187 -- Visit descendents that eventually get copied
14189 Visit_Field
(Union_Id
(Etype
(Old_Itype
)), Old_Itype
);
14191 if Is_Discrete_Type
(Old_Itype
) then
14192 Visit_Field
(Union_Id
(Scalar_Range
(Old_Itype
)), Old_Itype
);
14194 elsif Has_Discriminants
(Base_Type
(Old_Itype
)) then
14195 -- ??? This should involve call to Visit_Field
14196 Visit_Elist
(Discriminant_Constraint
(Old_Itype
));
14198 elsif Is_Array_Type
(Old_Itype
) then
14199 if Present
(First_Index
(Old_Itype
)) then
14200 Visit_Field
(Union_Id
(List_Containing
14201 (First_Index
(Old_Itype
))),
14205 if Is_Packed
(Old_Itype
) then
14206 Visit_Field
(Union_Id
(Packed_Array_Impl_Type
(Old_Itype
)),
14216 procedure Visit_List
(L
: List_Id
) is
14219 if L
/= No_List
then
14222 while Present
(N
) loop
14233 procedure Visit_Node
(N
: Node_Or_Entity_Id
) is
14235 -- Start of processing for Visit_Node
14238 -- Handle case of an Itype, which must be copied
14240 if Has_Extension
(N
) and then Is_Itype
(N
) then
14242 -- Nothing to do if already in the list. This can happen with an
14243 -- Itype entity that appears more than once in the tree.
14244 -- Note that we do not want to visit descendents in this case.
14246 -- Test for already in list when hash table is used
14248 if NCT_Hash_Tables_Used
then
14249 if Present
(NCT_Assoc
.Get
(Entity_Id
(N
))) then
14253 -- Test for already in list when hash table not used
14259 if Present
(Actual_Map
) then
14260 E
:= First_Elmt
(Actual_Map
);
14261 while Present
(E
) loop
14262 if Node
(E
) = N
then
14265 E
:= Next_Elmt
(Next_Elmt
(E
));
14275 -- Visit descendents
14277 Visit_Field
(Field1
(N
), N
);
14278 Visit_Field
(Field2
(N
), N
);
14279 Visit_Field
(Field3
(N
), N
);
14280 Visit_Field
(Field4
(N
), N
);
14281 Visit_Field
(Field5
(N
), N
);
14284 -- Start of processing for New_Copy_Tree
14289 -- See if we should use hash table
14291 if No
(Actual_Map
) then
14292 NCT_Hash_Tables_Used
:= False;
14299 NCT_Table_Entries
:= 0;
14301 Elmt
:= First_Elmt
(Actual_Map
);
14302 while Present
(Elmt
) loop
14303 NCT_Table_Entries
:= NCT_Table_Entries
+ 1;
14308 if NCT_Table_Entries
> NCT_Hash_Threshold
then
14309 Build_NCT_Hash_Tables
;
14311 NCT_Hash_Tables_Used
:= False;
14316 -- Hash table set up if required, now start phase one by visiting
14317 -- top node (we will recursively visit the descendents).
14319 Visit_Node
(Source
);
14321 -- Now the second phase of the copy can start. First we process
14322 -- all the mapped entities, copying their descendents.
14324 if Present
(Actual_Map
) then
14327 New_Itype
: Entity_Id
;
14329 Elmt
:= First_Elmt
(Actual_Map
);
14330 while Present
(Elmt
) loop
14332 New_Itype
:= Node
(Elmt
);
14333 Copy_Itype_With_Replacement
(New_Itype
);
14339 -- Now we can copy the actual tree
14341 return Copy_Node_With_Replacement
(Source
);
14344 -------------------------
14345 -- New_External_Entity --
14346 -------------------------
14348 function New_External_Entity
14349 (Kind
: Entity_Kind
;
14350 Scope_Id
: Entity_Id
;
14351 Sloc_Value
: Source_Ptr
;
14352 Related_Id
: Entity_Id
;
14353 Suffix
: Character;
14354 Suffix_Index
: Nat
:= 0;
14355 Prefix
: Character := ' ') return Entity_Id
14357 N
: constant Entity_Id
:=
14358 Make_Defining_Identifier
(Sloc_Value
,
14360 (Chars
(Related_Id
), Suffix
, Suffix_Index
, Prefix
));
14363 Set_Ekind
(N
, Kind
);
14364 Set_Is_Internal
(N
, True);
14365 Append_Entity
(N
, Scope_Id
);
14366 Set_Public_Status
(N
);
14368 if Kind
in Type_Kind
then
14369 Init_Size_Align
(N
);
14373 end New_External_Entity
;
14375 -------------------------
14376 -- New_Internal_Entity --
14377 -------------------------
14379 function New_Internal_Entity
14380 (Kind
: Entity_Kind
;
14381 Scope_Id
: Entity_Id
;
14382 Sloc_Value
: Source_Ptr
;
14383 Id_Char
: Character) return Entity_Id
14385 N
: constant Entity_Id
:= Make_Temporary
(Sloc_Value
, Id_Char
);
14388 Set_Ekind
(N
, Kind
);
14389 Set_Is_Internal
(N
, True);
14390 Append_Entity
(N
, Scope_Id
);
14392 if Kind
in Type_Kind
then
14393 Init_Size_Align
(N
);
14397 end New_Internal_Entity
;
14403 function Next_Actual
(Actual_Id
: Node_Id
) return Node_Id
is
14407 -- If we are pointing at a positional parameter, it is a member of a
14408 -- node list (the list of parameters), and the next parameter is the
14409 -- next node on the list, unless we hit a parameter association, then
14410 -- we shift to using the chain whose head is the First_Named_Actual in
14411 -- the parent, and then is threaded using the Next_Named_Actual of the
14412 -- Parameter_Association. All this fiddling is because the original node
14413 -- list is in the textual call order, and what we need is the
14414 -- declaration order.
14416 if Is_List_Member
(Actual_Id
) then
14417 N
:= Next
(Actual_Id
);
14419 if Nkind
(N
) = N_Parameter_Association
then
14420 return First_Named_Actual
(Parent
(Actual_Id
));
14426 return Next_Named_Actual
(Parent
(Actual_Id
));
14430 procedure Next_Actual
(Actual_Id
: in out Node_Id
) is
14432 Actual_Id
:= Next_Actual
(Actual_Id
);
14435 -----------------------
14436 -- Normalize_Actuals --
14437 -----------------------
14439 -- Chain actuals according to formals of subprogram. If there are no named
14440 -- associations, the chain is simply the list of Parameter Associations,
14441 -- since the order is the same as the declaration order. If there are named
14442 -- associations, then the First_Named_Actual field in the N_Function_Call
14443 -- or N_Procedure_Call_Statement node points to the Parameter_Association
14444 -- node for the parameter that comes first in declaration order. The
14445 -- remaining named parameters are then chained in declaration order using
14446 -- Next_Named_Actual.
14448 -- This routine also verifies that the number of actuals is compatible with
14449 -- the number and default values of formals, but performs no type checking
14450 -- (type checking is done by the caller).
14452 -- If the matching succeeds, Success is set to True and the caller proceeds
14453 -- with type-checking. If the match is unsuccessful, then Success is set to
14454 -- False, and the caller attempts a different interpretation, if there is
14457 -- If the flag Report is on, the call is not overloaded, and a failure to
14458 -- match can be reported here, rather than in the caller.
14460 procedure Normalize_Actuals
14464 Success
: out Boolean)
14466 Actuals
: constant List_Id
:= Parameter_Associations
(N
);
14467 Actual
: Node_Id
:= Empty
;
14468 Formal
: Entity_Id
;
14469 Last
: Node_Id
:= Empty
;
14470 First_Named
: Node_Id
:= Empty
;
14473 Formals_To_Match
: Integer := 0;
14474 Actuals_To_Match
: Integer := 0;
14476 procedure Chain
(A
: Node_Id
);
14477 -- Add named actual at the proper place in the list, using the
14478 -- Next_Named_Actual link.
14480 function Reporting
return Boolean;
14481 -- Determines if an error is to be reported. To report an error, we
14482 -- need Report to be True, and also we do not report errors caused
14483 -- by calls to init procs that occur within other init procs. Such
14484 -- errors must always be cascaded errors, since if all the types are
14485 -- declared correctly, the compiler will certainly build decent calls.
14491 procedure Chain
(A
: Node_Id
) is
14495 -- Call node points to first actual in list
14497 Set_First_Named_Actual
(N
, Explicit_Actual_Parameter
(A
));
14500 Set_Next_Named_Actual
(Last
, Explicit_Actual_Parameter
(A
));
14504 Set_Next_Named_Actual
(Last
, Empty
);
14511 function Reporting
return Boolean is
14516 elsif not Within_Init_Proc
then
14519 elsif Is_Init_Proc
(Entity
(Name
(N
))) then
14527 -- Start of processing for Normalize_Actuals
14530 if Is_Access_Type
(S
) then
14532 -- The name in the call is a function call that returns an access
14533 -- to subprogram. The designated type has the list of formals.
14535 Formal
:= First_Formal
(Designated_Type
(S
));
14537 Formal
:= First_Formal
(S
);
14540 while Present
(Formal
) loop
14541 Formals_To_Match
:= Formals_To_Match
+ 1;
14542 Next_Formal
(Formal
);
14545 -- Find if there is a named association, and verify that no positional
14546 -- associations appear after named ones.
14548 if Present
(Actuals
) then
14549 Actual
:= First
(Actuals
);
14552 while Present
(Actual
)
14553 and then Nkind
(Actual
) /= N_Parameter_Association
14555 Actuals_To_Match
:= Actuals_To_Match
+ 1;
14559 if No
(Actual
) and Actuals_To_Match
= Formals_To_Match
then
14561 -- Most common case: positional notation, no defaults
14566 elsif Actuals_To_Match
> Formals_To_Match
then
14568 -- Too many actuals: will not work
14571 if Is_Entity_Name
(Name
(N
)) then
14572 Error_Msg_N
("too many arguments in call to&", Name
(N
));
14574 Error_Msg_N
("too many arguments in call", N
);
14582 First_Named
:= Actual
;
14584 while Present
(Actual
) loop
14585 if Nkind
(Actual
) /= N_Parameter_Association
then
14587 ("positional parameters not allowed after named ones", Actual
);
14592 Actuals_To_Match
:= Actuals_To_Match
+ 1;
14598 if Present
(Actuals
) then
14599 Actual
:= First
(Actuals
);
14602 Formal
:= First_Formal
(S
);
14603 while Present
(Formal
) loop
14605 -- Match the formals in order. If the corresponding actual is
14606 -- positional, nothing to do. Else scan the list of named actuals
14607 -- to find the one with the right name.
14609 if Present
(Actual
)
14610 and then Nkind
(Actual
) /= N_Parameter_Association
14613 Actuals_To_Match
:= Actuals_To_Match
- 1;
14614 Formals_To_Match
:= Formals_To_Match
- 1;
14617 -- For named parameters, search the list of actuals to find
14618 -- one that matches the next formal name.
14620 Actual
:= First_Named
;
14622 while Present
(Actual
) loop
14623 if Chars
(Selector_Name
(Actual
)) = Chars
(Formal
) then
14626 Actuals_To_Match
:= Actuals_To_Match
- 1;
14627 Formals_To_Match
:= Formals_To_Match
- 1;
14635 if Ekind
(Formal
) /= E_In_Parameter
14636 or else No
(Default_Value
(Formal
))
14639 if (Comes_From_Source
(S
)
14640 or else Sloc
(S
) = Standard_Location
)
14641 and then Is_Overloadable
(S
)
14645 Nkind_In
(Parent
(N
), N_Procedure_Call_Statement
,
14647 N_Parameter_Association
)
14648 and then Ekind
(S
) /= E_Function
14650 Set_Etype
(N
, Etype
(S
));
14653 Error_Msg_Name_1
:= Chars
(S
);
14654 Error_Msg_Sloc
:= Sloc
(S
);
14656 ("missing argument for parameter & "
14657 & "in call to % declared #", N
, Formal
);
14660 elsif Is_Overloadable
(S
) then
14661 Error_Msg_Name_1
:= Chars
(S
);
14663 -- Point to type derivation that generated the
14666 Error_Msg_Sloc
:= Sloc
(Parent
(S
));
14669 ("missing argument for parameter & "
14670 & "in call to % (inherited) #", N
, Formal
);
14674 ("missing argument for parameter &", N
, Formal
);
14682 Formals_To_Match
:= Formals_To_Match
- 1;
14687 Next_Formal
(Formal
);
14690 if Formals_To_Match
= 0 and then Actuals_To_Match
= 0 then
14697 -- Find some superfluous named actual that did not get
14698 -- attached to the list of associations.
14700 Actual
:= First
(Actuals
);
14701 while Present
(Actual
) loop
14702 if Nkind
(Actual
) = N_Parameter_Association
14703 and then Actual
/= Last
14704 and then No
(Next_Named_Actual
(Actual
))
14706 Error_Msg_N
("unmatched actual & in call",
14707 Selector_Name
(Actual
));
14718 end Normalize_Actuals
;
14720 --------------------------------
14721 -- Note_Possible_Modification --
14722 --------------------------------
14724 procedure Note_Possible_Modification
(N
: Node_Id
; Sure
: Boolean) is
14725 Modification_Comes_From_Source
: constant Boolean :=
14726 Comes_From_Source
(Parent
(N
));
14732 -- Loop to find referenced entity, if there is one
14738 if Is_Entity_Name
(Exp
) then
14739 Ent
:= Entity
(Exp
);
14741 -- If the entity is missing, it is an undeclared identifier,
14742 -- and there is nothing to annotate.
14748 elsif Nkind
(Exp
) = N_Explicit_Dereference
then
14750 P
: constant Node_Id
:= Prefix
(Exp
);
14753 -- In formal verification mode, keep track of all reads and
14754 -- writes through explicit dereferences.
14756 if GNATprove_Mode
then
14757 SPARK_Specific
.Generate_Dereference
(N
, 'm');
14760 if Nkind
(P
) = N_Selected_Component
14761 and then Present
(Entry_Formal
(Entity
(Selector_Name
(P
))))
14763 -- Case of a reference to an entry formal
14765 Ent
:= Entry_Formal
(Entity
(Selector_Name
(P
)));
14767 elsif Nkind
(P
) = N_Identifier
14768 and then Nkind
(Parent
(Entity
(P
))) = N_Object_Declaration
14769 and then Present
(Expression
(Parent
(Entity
(P
))))
14770 and then Nkind
(Expression
(Parent
(Entity
(P
)))) =
14773 -- Case of a reference to a value on which side effects have
14776 Exp
:= Prefix
(Expression
(Parent
(Entity
(P
))));
14784 elsif Nkind_In
(Exp
, N_Type_Conversion
,
14785 N_Unchecked_Type_Conversion
)
14787 Exp
:= Expression
(Exp
);
14790 elsif Nkind_In
(Exp
, N_Slice
,
14791 N_Indexed_Component
,
14792 N_Selected_Component
)
14794 -- Special check, if the prefix is an access type, then return
14795 -- since we are modifying the thing pointed to, not the prefix.
14796 -- When we are expanding, most usually the prefix is replaced
14797 -- by an explicit dereference, and this test is not needed, but
14798 -- in some cases (notably -gnatc mode and generics) when we do
14799 -- not do full expansion, we need this special test.
14801 if Is_Access_Type
(Etype
(Prefix
(Exp
))) then
14804 -- Otherwise go to prefix and keep going
14807 Exp
:= Prefix
(Exp
);
14811 -- All other cases, not a modification
14817 -- Now look for entity being referenced
14819 if Present
(Ent
) then
14820 if Is_Object
(Ent
) then
14821 if Comes_From_Source
(Exp
)
14822 or else Modification_Comes_From_Source
14824 -- Give warning if pragma unmodified given and we are
14825 -- sure this is a modification.
14827 if Has_Pragma_Unmodified
(Ent
) and then Sure
then
14828 Error_Msg_NE
("??pragma Unmodified given for &!", N
, Ent
);
14831 Set_Never_Set_In_Source
(Ent
, False);
14834 Set_Is_True_Constant
(Ent
, False);
14835 Set_Current_Value
(Ent
, Empty
);
14836 Set_Is_Known_Null
(Ent
, False);
14838 if not Can_Never_Be_Null
(Ent
) then
14839 Set_Is_Known_Non_Null
(Ent
, False);
14842 -- Follow renaming chain
14844 if (Ekind
(Ent
) = E_Variable
or else Ekind
(Ent
) = E_Constant
)
14845 and then Present
(Renamed_Object
(Ent
))
14847 Exp
:= Renamed_Object
(Ent
);
14849 -- If the entity is the loop variable in an iteration over
14850 -- a container, retrieve container expression to indicate
14851 -- possible modificastion.
14853 if Present
(Related_Expression
(Ent
))
14854 and then Nkind
(Parent
(Related_Expression
(Ent
))) =
14855 N_Iterator_Specification
14857 Exp
:= Original_Node
(Related_Expression
(Ent
));
14862 -- The expression may be the renaming of a subcomponent of an
14863 -- array or container. The assignment to the subcomponent is
14864 -- a modification of the container.
14866 elsif Comes_From_Source
(Original_Node
(Exp
))
14867 and then Nkind_In
(Original_Node
(Exp
), N_Selected_Component
,
14868 N_Indexed_Component
)
14870 Exp
:= Prefix
(Original_Node
(Exp
));
14874 -- Generate a reference only if the assignment comes from
14875 -- source. This excludes, for example, calls to a dispatching
14876 -- assignment operation when the left-hand side is tagged. In
14877 -- GNATprove mode, we need those references also on generated
14878 -- code, as these are used to compute the local effects of
14881 if Modification_Comes_From_Source
or GNATprove_Mode
then
14882 Generate_Reference
(Ent
, Exp
, 'm');
14884 -- If the target of the assignment is the bound variable
14885 -- in an iterator, indicate that the corresponding array
14886 -- or container is also modified.
14888 if Ada_Version
>= Ada_2012
14889 and then Nkind
(Parent
(Ent
)) = N_Iterator_Specification
14892 Domain
: constant Node_Id
:= Name
(Parent
(Ent
));
14895 -- TBD : in the full version of the construct, the
14896 -- domain of iteration can be given by an expression.
14898 if Is_Entity_Name
(Domain
) then
14899 Generate_Reference
(Entity
(Domain
), Exp
, 'm');
14900 Set_Is_True_Constant
(Entity
(Domain
), False);
14901 Set_Never_Set_In_Source
(Entity
(Domain
), False);
14907 Check_Nested_Access
(Ent
);
14912 -- If we are sure this is a modification from source, and we know
14913 -- this modifies a constant, then give an appropriate warning.
14915 if Overlays_Constant
(Ent
)
14916 and then (Modification_Comes_From_Source
and Sure
)
14919 A
: constant Node_Id
:= Address_Clause
(Ent
);
14921 if Present
(A
) then
14923 Exp
: constant Node_Id
:= Expression
(A
);
14925 if Nkind
(Exp
) = N_Attribute_Reference
14926 and then Attribute_Name
(Exp
) = Name_Address
14927 and then Is_Entity_Name
(Prefix
(Exp
))
14929 Error_Msg_Sloc
:= Sloc
(A
);
14931 ("constant& may be modified via address "
14932 & "clause#??", N
, Entity
(Prefix
(Exp
)));
14945 end Note_Possible_Modification
;
14947 -------------------------
14948 -- Object_Access_Level --
14949 -------------------------
14951 -- Returns the static accessibility level of the view denoted by Obj. Note
14952 -- that the value returned is the result of a call to Scope_Depth. Only
14953 -- scope depths associated with dynamic scopes can actually be returned.
14954 -- Since only relative levels matter for accessibility checking, the fact
14955 -- that the distance between successive levels of accessibility is not
14956 -- always one is immaterial (invariant: if level(E2) is deeper than
14957 -- level(E1), then Scope_Depth(E1) < Scope_Depth(E2)).
14959 function Object_Access_Level
(Obj
: Node_Id
) return Uint
is
14960 function Is_Interface_Conversion
(N
: Node_Id
) return Boolean;
14961 -- Determine whether N is a construct of the form
14962 -- Some_Type (Operand._tag'Address)
14963 -- This construct appears in the context of dispatching calls.
14965 function Reference_To
(Obj
: Node_Id
) return Node_Id
;
14966 -- An explicit dereference is created when removing side-effects from
14967 -- expressions for constraint checking purposes. In this case a local
14968 -- access type is created for it. The correct access level is that of
14969 -- the original source node. We detect this case by noting that the
14970 -- prefix of the dereference is created by an object declaration whose
14971 -- initial expression is a reference.
14973 -----------------------------
14974 -- Is_Interface_Conversion --
14975 -----------------------------
14977 function Is_Interface_Conversion
(N
: Node_Id
) return Boolean is
14979 return Nkind
(N
) = N_Unchecked_Type_Conversion
14980 and then Nkind
(Expression
(N
)) = N_Attribute_Reference
14981 and then Attribute_Name
(Expression
(N
)) = Name_Address
;
14982 end Is_Interface_Conversion
;
14988 function Reference_To
(Obj
: Node_Id
) return Node_Id
is
14989 Pref
: constant Node_Id
:= Prefix
(Obj
);
14991 if Is_Entity_Name
(Pref
)
14992 and then Nkind
(Parent
(Entity
(Pref
))) = N_Object_Declaration
14993 and then Present
(Expression
(Parent
(Entity
(Pref
))))
14994 and then Nkind
(Expression
(Parent
(Entity
(Pref
)))) = N_Reference
14996 return (Prefix
(Expression
(Parent
(Entity
(Pref
)))));
15006 -- Start of processing for Object_Access_Level
15009 if Nkind
(Obj
) = N_Defining_Identifier
15010 or else Is_Entity_Name
(Obj
)
15012 if Nkind
(Obj
) = N_Defining_Identifier
then
15018 if Is_Prival
(E
) then
15019 E
:= Prival_Link
(E
);
15022 -- If E is a type then it denotes a current instance. For this case
15023 -- we add one to the normal accessibility level of the type to ensure
15024 -- that current instances are treated as always being deeper than
15025 -- than the level of any visible named access type (see 3.10.2(21)).
15027 if Is_Type
(E
) then
15028 return Type_Access_Level
(E
) + 1;
15030 elsif Present
(Renamed_Object
(E
)) then
15031 return Object_Access_Level
(Renamed_Object
(E
));
15033 -- Similarly, if E is a component of the current instance of a
15034 -- protected type, any instance of it is assumed to be at a deeper
15035 -- level than the type. For a protected object (whose type is an
15036 -- anonymous protected type) its components are at the same level
15037 -- as the type itself.
15039 elsif not Is_Overloadable
(E
)
15040 and then Ekind
(Scope
(E
)) = E_Protected_Type
15041 and then Comes_From_Source
(Scope
(E
))
15043 return Type_Access_Level
(Scope
(E
)) + 1;
15046 -- Aliased formals take their access level from the point of call.
15047 -- This is smaller than the level of the subprogram itself.
15049 if Is_Formal
(E
) and then Is_Aliased
(E
) then
15050 return Type_Access_Level
(Etype
(E
));
15053 return Scope_Depth
(Enclosing_Dynamic_Scope
(E
));
15057 elsif Nkind
(Obj
) = N_Selected_Component
then
15058 if Is_Access_Type
(Etype
(Prefix
(Obj
))) then
15059 return Type_Access_Level
(Etype
(Prefix
(Obj
)));
15061 return Object_Access_Level
(Prefix
(Obj
));
15064 elsif Nkind
(Obj
) = N_Indexed_Component
then
15065 if Is_Access_Type
(Etype
(Prefix
(Obj
))) then
15066 return Type_Access_Level
(Etype
(Prefix
(Obj
)));
15068 return Object_Access_Level
(Prefix
(Obj
));
15071 elsif Nkind
(Obj
) = N_Explicit_Dereference
then
15073 -- If the prefix is a selected access discriminant then we make a
15074 -- recursive call on the prefix, which will in turn check the level
15075 -- of the prefix object of the selected discriminant.
15077 if Nkind
(Prefix
(Obj
)) = N_Selected_Component
15078 and then Ekind
(Etype
(Prefix
(Obj
))) = E_Anonymous_Access_Type
15080 Ekind
(Entity
(Selector_Name
(Prefix
(Obj
)))) = E_Discriminant
15082 return Object_Access_Level
(Prefix
(Obj
));
15084 -- Detect an interface conversion in the context of a dispatching
15085 -- call. Use the original form of the conversion to find the access
15086 -- level of the operand.
15088 elsif Is_Interface
(Etype
(Obj
))
15089 and then Is_Interface_Conversion
(Prefix
(Obj
))
15090 and then Nkind
(Original_Node
(Obj
)) = N_Type_Conversion
15092 return Object_Access_Level
(Original_Node
(Obj
));
15094 elsif not Comes_From_Source
(Obj
) then
15096 Ref
: constant Node_Id
:= Reference_To
(Obj
);
15098 if Present
(Ref
) then
15099 return Object_Access_Level
(Ref
);
15101 return Type_Access_Level
(Etype
(Prefix
(Obj
)));
15106 return Type_Access_Level
(Etype
(Prefix
(Obj
)));
15109 elsif Nkind_In
(Obj
, N_Type_Conversion
, N_Unchecked_Type_Conversion
) then
15110 return Object_Access_Level
(Expression
(Obj
));
15112 elsif Nkind
(Obj
) = N_Function_Call
then
15114 -- Function results are objects, so we get either the access level of
15115 -- the function or, in the case of an indirect call, the level of the
15116 -- access-to-subprogram type. (This code is used for Ada 95, but it
15117 -- looks wrong, because it seems that we should be checking the level
15118 -- of the call itself, even for Ada 95. However, using the Ada 2005
15119 -- version of the code causes regressions in several tests that are
15120 -- compiled with -gnat95. ???)
15122 if Ada_Version
< Ada_2005
then
15123 if Is_Entity_Name
(Name
(Obj
)) then
15124 return Subprogram_Access_Level
(Entity
(Name
(Obj
)));
15126 return Type_Access_Level
(Etype
(Prefix
(Name
(Obj
))));
15129 -- For Ada 2005, the level of the result object of a function call is
15130 -- defined to be the level of the call's innermost enclosing master.
15131 -- We determine that by querying the depth of the innermost enclosing
15135 Return_Master_Scope_Depth_Of_Call
: declare
15137 function Innermost_Master_Scope_Depth
15138 (N
: Node_Id
) return Uint
;
15139 -- Returns the scope depth of the given node's innermost
15140 -- enclosing dynamic scope (effectively the accessibility
15141 -- level of the innermost enclosing master).
15143 ----------------------------------
15144 -- Innermost_Master_Scope_Depth --
15145 ----------------------------------
15147 function Innermost_Master_Scope_Depth
15148 (N
: Node_Id
) return Uint
15150 Node_Par
: Node_Id
:= Parent
(N
);
15153 -- Locate the nearest enclosing node (by traversing Parents)
15154 -- that Defining_Entity can be applied to, and return the
15155 -- depth of that entity's nearest enclosing dynamic scope.
15157 while Present
(Node_Par
) loop
15158 case Nkind
(Node_Par
) is
15159 when N_Component_Declaration |
15160 N_Entry_Declaration |
15161 N_Formal_Object_Declaration |
15162 N_Formal_Type_Declaration |
15163 N_Full_Type_Declaration |
15164 N_Incomplete_Type_Declaration |
15165 N_Loop_Parameter_Specification |
15166 N_Object_Declaration |
15167 N_Protected_Type_Declaration |
15168 N_Private_Extension_Declaration |
15169 N_Private_Type_Declaration |
15170 N_Subtype_Declaration |
15171 N_Function_Specification |
15172 N_Procedure_Specification |
15173 N_Task_Type_Declaration |
15175 N_Generic_Instantiation |
15177 N_Implicit_Label_Declaration |
15178 N_Package_Declaration |
15179 N_Single_Task_Declaration |
15180 N_Subprogram_Declaration |
15181 N_Generic_Declaration |
15182 N_Renaming_Declaration |
15183 N_Block_Statement |
15184 N_Formal_Subprogram_Declaration |
15185 N_Abstract_Subprogram_Declaration |
15187 N_Exception_Declaration |
15188 N_Formal_Package_Declaration |
15189 N_Number_Declaration |
15190 N_Package_Specification |
15191 N_Parameter_Specification |
15192 N_Single_Protected_Declaration |
15196 (Nearest_Dynamic_Scope
15197 (Defining_Entity
(Node_Par
)));
15203 Node_Par
:= Parent
(Node_Par
);
15206 pragma Assert
(False);
15208 -- Should never reach the following return
15210 return Scope_Depth
(Current_Scope
) + 1;
15211 end Innermost_Master_Scope_Depth
;
15213 -- Start of processing for Return_Master_Scope_Depth_Of_Call
15216 return Innermost_Master_Scope_Depth
(Obj
);
15217 end Return_Master_Scope_Depth_Of_Call
;
15220 -- For convenience we handle qualified expressions, even though they
15221 -- aren't technically object names.
15223 elsif Nkind
(Obj
) = N_Qualified_Expression
then
15224 return Object_Access_Level
(Expression
(Obj
));
15226 -- Ditto for aggregates. They have the level of the temporary that
15227 -- will hold their value.
15229 elsif Nkind
(Obj
) = N_Aggregate
then
15230 return Object_Access_Level
(Current_Scope
);
15232 -- Otherwise return the scope level of Standard. (If there are cases
15233 -- that fall through to this point they will be treated as having
15234 -- global accessibility for now. ???)
15237 return Scope_Depth
(Standard_Standard
);
15239 end Object_Access_Level
;
15241 --------------------------
15242 -- Original_Aspect_Name --
15243 --------------------------
15245 function Original_Aspect_Name
(N
: Node_Id
) return Name_Id
is
15250 pragma Assert
(Nkind_In
(N
, N_Aspect_Specification
, N_Pragma
));
15253 if Is_Rewrite_Substitution
(Pras
)
15254 and then Nkind
(Original_Node
(Pras
)) = N_Pragma
15256 Pras
:= Original_Node
(Pras
);
15259 -- Case where we came from aspect specication
15261 if Nkind
(Pras
) = N_Pragma
and then From_Aspect_Specification
(Pras
) then
15262 Pras
:= Corresponding_Aspect
(Pras
);
15265 -- Get name from aspect or pragma
15267 if Nkind
(Pras
) = N_Pragma
then
15268 Name
:= Pragma_Name
(Pras
);
15270 Name
:= Chars
(Identifier
(Pras
));
15273 -- Deal with 'Class
15275 if Class_Present
(Pras
) then
15278 -- Names that need converting to special _xxx form
15286 Name
:= Name_uPost
;
15288 when Name_Invariant
=>
15289 Name
:= Name_uInvariant
;
15291 when Name_Type_Invariant |
15292 Name_Type_Invariant_Class
=>
15293 Name
:= Name_uType_Invariant
;
15295 -- Nothing to do for other cases (e.g. a Check that derived
15296 -- from Pre_Class and has the flag set). Also we do nothing
15297 -- if the name is already in special _xxx form.
15305 end Original_Aspect_Name
;
15307 --------------------------------------
15308 -- Original_Corresponding_Operation --
15309 --------------------------------------
15311 function Original_Corresponding_Operation
(S
: Entity_Id
) return Entity_Id
15313 Typ
: constant Entity_Id
:= Find_Dispatching_Type
(S
);
15316 -- If S is an inherited primitive S2 the original corresponding
15317 -- operation of S is the original corresponding operation of S2
15319 if Present
(Alias
(S
))
15320 and then Find_Dispatching_Type
(Alias
(S
)) /= Typ
15322 return Original_Corresponding_Operation
(Alias
(S
));
15324 -- If S overrides an inherited subprogram S2 the original corresponding
15325 -- operation of S is the original corresponding operation of S2
15327 elsif Present
(Overridden_Operation
(S
)) then
15328 return Original_Corresponding_Operation
(Overridden_Operation
(S
));
15330 -- otherwise it is S itself
15335 end Original_Corresponding_Operation
;
15337 ----------------------------------
15338 -- Predicate_Tests_On_Arguments --
15339 ----------------------------------
15341 function Predicate_Tests_On_Arguments
(Subp
: Entity_Id
) return Boolean is
15343 -- Always test predicates on indirect call
15345 if Ekind
(Subp
) = E_Subprogram_Type
then
15348 -- Do not test predicates on call to generated default Finalize, since
15349 -- we are not interested in whether something we are finalizing (and
15350 -- typically destroying) satisfies its predicates.
15352 elsif Chars
(Subp
) = Name_Finalize
15353 and then not Comes_From_Source
(Subp
)
15357 -- Do not test predicates on any internally generated routines
15359 elsif Is_Internal_Name
(Chars
(Subp
)) then
15362 -- Do not test predicates on call to Init_Proc, since if needed the
15363 -- predicate test will occur at some other point.
15365 elsif Is_Init_Proc
(Subp
) then
15368 -- Do not test predicates on call to predicate function, since this
15369 -- would cause infinite recursion.
15371 elsif Ekind
(Subp
) = E_Function
15372 and then (Is_Predicate_Function
(Subp
)
15374 Is_Predicate_Function_M
(Subp
))
15378 -- For now, no other exceptions
15383 end Predicate_Tests_On_Arguments
;
15385 -----------------------
15386 -- Private_Component --
15387 -----------------------
15389 function Private_Component
(Type_Id
: Entity_Id
) return Entity_Id
is
15390 Ancestor
: constant Entity_Id
:= Base_Type
(Type_Id
);
15392 function Trace_Components
15394 Check
: Boolean) return Entity_Id
;
15395 -- Recursive function that does the work, and checks against circular
15396 -- definition for each subcomponent type.
15398 ----------------------
15399 -- Trace_Components --
15400 ----------------------
15402 function Trace_Components
15404 Check
: Boolean) return Entity_Id
15406 Btype
: constant Entity_Id
:= Base_Type
(T
);
15407 Component
: Entity_Id
;
15409 Candidate
: Entity_Id
:= Empty
;
15412 if Check
and then Btype
= Ancestor
then
15413 Error_Msg_N
("circular type definition", Type_Id
);
15417 if Is_Private_Type
(Btype
) and then not Is_Generic_Type
(Btype
) then
15418 if Present
(Full_View
(Btype
))
15419 and then Is_Record_Type
(Full_View
(Btype
))
15420 and then not Is_Frozen
(Btype
)
15422 -- To indicate that the ancestor depends on a private type, the
15423 -- current Btype is sufficient. However, to check for circular
15424 -- definition we must recurse on the full view.
15426 Candidate
:= Trace_Components
(Full_View
(Btype
), True);
15428 if Candidate
= Any_Type
then
15438 elsif Is_Array_Type
(Btype
) then
15439 return Trace_Components
(Component_Type
(Btype
), True);
15441 elsif Is_Record_Type
(Btype
) then
15442 Component
:= First_Entity
(Btype
);
15443 while Present
(Component
)
15444 and then Comes_From_Source
(Component
)
15446 -- Skip anonymous types generated by constrained components
15448 if not Is_Type
(Component
) then
15449 P
:= Trace_Components
(Etype
(Component
), True);
15451 if Present
(P
) then
15452 if P
= Any_Type
then
15460 Next_Entity
(Component
);
15468 end Trace_Components
;
15470 -- Start of processing for Private_Component
15473 return Trace_Components
(Type_Id
, False);
15474 end Private_Component
;
15476 ---------------------------
15477 -- Primitive_Names_Match --
15478 ---------------------------
15480 function Primitive_Names_Match
(E1
, E2
: Entity_Id
) return Boolean is
15482 function Non_Internal_Name
(E
: Entity_Id
) return Name_Id
;
15483 -- Given an internal name, returns the corresponding non-internal name
15485 ------------------------
15486 -- Non_Internal_Name --
15487 ------------------------
15489 function Non_Internal_Name
(E
: Entity_Id
) return Name_Id
is
15491 Get_Name_String
(Chars
(E
));
15492 Name_Len
:= Name_Len
- 1;
15494 end Non_Internal_Name
;
15496 -- Start of processing for Primitive_Names_Match
15499 pragma Assert
(Present
(E1
) and then Present
(E2
));
15501 return Chars
(E1
) = Chars
(E2
)
15503 (not Is_Internal_Name
(Chars
(E1
))
15504 and then Is_Internal_Name
(Chars
(E2
))
15505 and then Non_Internal_Name
(E2
) = Chars
(E1
))
15507 (not Is_Internal_Name
(Chars
(E2
))
15508 and then Is_Internal_Name
(Chars
(E1
))
15509 and then Non_Internal_Name
(E1
) = Chars
(E2
))
15511 (Is_Predefined_Dispatching_Operation
(E1
)
15512 and then Is_Predefined_Dispatching_Operation
(E2
)
15513 and then Same_TSS
(E1
, E2
))
15515 (Is_Init_Proc
(E1
) and then Is_Init_Proc
(E2
));
15516 end Primitive_Names_Match
;
15518 -----------------------
15519 -- Process_End_Label --
15520 -----------------------
15522 procedure Process_End_Label
15531 Label_Ref
: Boolean;
15532 -- Set True if reference to end label itself is required
15535 -- Gets set to the operator symbol or identifier that references the
15536 -- entity Ent. For the child unit case, this is the identifier from the
15537 -- designator. For other cases, this is simply Endl.
15539 procedure Generate_Parent_Ref
(N
: Node_Id
; E
: Entity_Id
);
15540 -- N is an identifier node that appears as a parent unit reference in
15541 -- the case where Ent is a child unit. This procedure generates an
15542 -- appropriate cross-reference entry. E is the corresponding entity.
15544 -------------------------
15545 -- Generate_Parent_Ref --
15546 -------------------------
15548 procedure Generate_Parent_Ref
(N
: Node_Id
; E
: Entity_Id
) is
15550 -- If names do not match, something weird, skip reference
15552 if Chars
(E
) = Chars
(N
) then
15554 -- Generate the reference. We do NOT consider this as a reference
15555 -- for unreferenced symbol purposes.
15557 Generate_Reference
(E
, N
, 'r', Set_Ref
=> False, Force
=> True);
15559 if Style_Check
then
15560 Style
.Check_Identifier
(N
, E
);
15563 end Generate_Parent_Ref
;
15565 -- Start of processing for Process_End_Label
15568 -- If no node, ignore. This happens in some error situations, and
15569 -- also for some internally generated structures where no end label
15570 -- references are required in any case.
15576 -- Nothing to do if no End_Label, happens for internally generated
15577 -- constructs where we don't want an end label reference anyway. Also
15578 -- nothing to do if Endl is a string literal, which means there was
15579 -- some prior error (bad operator symbol)
15581 Endl
:= End_Label
(N
);
15583 if No
(Endl
) or else Nkind
(Endl
) = N_String_Literal
then
15587 -- Reference node is not in extended main source unit
15589 if not In_Extended_Main_Source_Unit
(N
) then
15591 -- Generally we do not collect references except for the extended
15592 -- main source unit. The one exception is the 'e' entry for a
15593 -- package spec, where it is useful for a client to have the
15594 -- ending information to define scopes.
15600 Label_Ref
:= False;
15602 -- For this case, we can ignore any parent references, but we
15603 -- need the package name itself for the 'e' entry.
15605 if Nkind
(Endl
) = N_Designator
then
15606 Endl
:= Identifier
(Endl
);
15610 -- Reference is in extended main source unit
15615 -- For designator, generate references for the parent entries
15617 if Nkind
(Endl
) = N_Designator
then
15619 -- Generate references for the prefix if the END line comes from
15620 -- source (otherwise we do not need these references) We climb the
15621 -- scope stack to find the expected entities.
15623 if Comes_From_Source
(Endl
) then
15624 Nam
:= Name
(Endl
);
15625 Scop
:= Current_Scope
;
15626 while Nkind
(Nam
) = N_Selected_Component
loop
15627 Scop
:= Scope
(Scop
);
15628 exit when No
(Scop
);
15629 Generate_Parent_Ref
(Selector_Name
(Nam
), Scop
);
15630 Nam
:= Prefix
(Nam
);
15633 if Present
(Scop
) then
15634 Generate_Parent_Ref
(Nam
, Scope
(Scop
));
15638 Endl
:= Identifier
(Endl
);
15642 -- If the end label is not for the given entity, then either we have
15643 -- some previous error, or this is a generic instantiation for which
15644 -- we do not need to make a cross-reference in this case anyway. In
15645 -- either case we simply ignore the call.
15647 if Chars
(Ent
) /= Chars
(Endl
) then
15651 -- If label was really there, then generate a normal reference and then
15652 -- adjust the location in the end label to point past the name (which
15653 -- should almost always be the semicolon).
15655 Loc
:= Sloc
(Endl
);
15657 if Comes_From_Source
(Endl
) then
15659 -- If a label reference is required, then do the style check and
15660 -- generate an l-type cross-reference entry for the label
15663 if Style_Check
then
15664 Style
.Check_Identifier
(Endl
, Ent
);
15667 Generate_Reference
(Ent
, Endl
, 'l', Set_Ref
=> False);
15670 -- Set the location to point past the label (normally this will
15671 -- mean the semicolon immediately following the label). This is
15672 -- done for the sake of the 'e' or 't' entry generated below.
15674 Get_Decoded_Name_String
(Chars
(Endl
));
15675 Set_Sloc
(Endl
, Sloc
(Endl
) + Source_Ptr
(Name_Len
));
15678 -- In SPARK mode, no missing label is allowed for packages and
15679 -- subprogram bodies. Detect those cases by testing whether
15680 -- Process_End_Label was called for a body (Typ = 't') or a package.
15682 if Restriction_Check_Required
(SPARK_05
)
15683 and then (Typ
= 't' or else Ekind
(Ent
) = E_Package
)
15685 Error_Msg_Node_1
:= Endl
;
15686 Check_SPARK_05_Restriction
15687 ("`END &` required", Endl
, Force
=> True);
15691 -- Now generate the e/t reference
15693 Generate_Reference
(Ent
, Endl
, Typ
, Set_Ref
=> False, Force
=> True);
15695 -- Restore Sloc, in case modified above, since we have an identifier
15696 -- and the normal Sloc should be left set in the tree.
15698 Set_Sloc
(Endl
, Loc
);
15699 end Process_End_Label
;
15705 function Referenced
(Id
: Entity_Id
; Expr
: Node_Id
) return Boolean is
15706 Seen
: Boolean := False;
15708 function Is_Reference
(N
: Node_Id
) return Traverse_Result
;
15709 -- Determine whether node N denotes a reference to Id. If this is the
15710 -- case, set global flag Seen to True and stop the traversal.
15716 function Is_Reference
(N
: Node_Id
) return Traverse_Result
is
15718 if Is_Entity_Name
(N
)
15719 and then Present
(Entity
(N
))
15720 and then Entity
(N
) = Id
15729 procedure Inspect_Expression
is new Traverse_Proc
(Is_Reference
);
15731 -- Start of processing for Referenced
15734 Inspect_Expression
(Expr
);
15738 ------------------------------------
15739 -- References_Generic_Formal_Type --
15740 ------------------------------------
15742 function References_Generic_Formal_Type
(N
: Node_Id
) return Boolean is
15744 function Process
(N
: Node_Id
) return Traverse_Result
;
15745 -- Process one node in search for generic formal type
15751 function Process
(N
: Node_Id
) return Traverse_Result
is
15753 if Nkind
(N
) in N_Has_Entity
then
15755 E
: constant Entity_Id
:= Entity
(N
);
15757 if Present
(E
) then
15758 if Is_Generic_Type
(E
) then
15760 elsif Present
(Etype
(E
))
15761 and then Is_Generic_Type
(Etype
(E
))
15772 function Traverse
is new Traverse_Func
(Process
);
15773 -- Traverse tree to look for generic type
15776 if Inside_A_Generic
then
15777 return Traverse
(N
) = Abandon
;
15781 end References_Generic_Formal_Type
;
15783 --------------------
15784 -- Remove_Homonym --
15785 --------------------
15787 procedure Remove_Homonym
(E
: Entity_Id
) is
15788 Prev
: Entity_Id
:= Empty
;
15792 if E
= Current_Entity
(E
) then
15793 if Present
(Homonym
(E
)) then
15794 Set_Current_Entity
(Homonym
(E
));
15796 Set_Name_Entity_Id
(Chars
(E
), Empty
);
15800 H
:= Current_Entity
(E
);
15801 while Present
(H
) and then H
/= E
loop
15806 -- If E is not on the homonym chain, nothing to do
15808 if Present
(H
) then
15809 Set_Homonym
(Prev
, Homonym
(E
));
15812 end Remove_Homonym
;
15814 ---------------------
15815 -- Rep_To_Pos_Flag --
15816 ---------------------
15818 function Rep_To_Pos_Flag
(E
: Entity_Id
; Loc
: Source_Ptr
) return Node_Id
is
15820 return New_Occurrence_Of
15821 (Boolean_Literals
(not Range_Checks_Suppressed
(E
)), Loc
);
15822 end Rep_To_Pos_Flag
;
15824 --------------------
15825 -- Require_Entity --
15826 --------------------
15828 procedure Require_Entity
(N
: Node_Id
) is
15830 if Is_Entity_Name
(N
) and then No
(Entity
(N
)) then
15831 if Total_Errors_Detected
/= 0 then
15832 Set_Entity
(N
, Any_Id
);
15834 raise Program_Error
;
15837 end Require_Entity
;
15839 -------------------------------
15840 -- Requires_State_Refinement --
15841 -------------------------------
15843 function Requires_State_Refinement
15844 (Spec_Id
: Entity_Id
;
15845 Body_Id
: Entity_Id
) return Boolean
15847 function Mode_Is_Off
(Prag
: Node_Id
) return Boolean;
15848 -- Given pragma SPARK_Mode, determine whether the mode is Off
15854 function Mode_Is_Off
(Prag
: Node_Id
) return Boolean is
15858 -- The default SPARK mode is On
15864 Mode
:= Get_Pragma_Arg
(First
(Pragma_Argument_Associations
(Prag
)));
15866 -- Then the pragma lacks an argument, the default mode is On
15871 return Chars
(Mode
) = Name_Off
;
15875 -- Start of processing for Requires_State_Refinement
15878 -- A package that does not define at least one abstract state cannot
15879 -- possibly require refinement.
15881 if No
(Abstract_States
(Spec_Id
)) then
15884 -- The package instroduces a single null state which does not merit
15887 elsif Has_Null_Abstract_State
(Spec_Id
) then
15890 -- Check whether the package body is subject to pragma SPARK_Mode. If
15891 -- it is and the mode is Off, the package body is considered to be in
15892 -- regular Ada and does not require refinement.
15894 elsif Mode_Is_Off
(SPARK_Pragma
(Body_Id
)) then
15897 -- The body's SPARK_Mode may be inherited from a similar pragma that
15898 -- appears in the private declarations of the spec. The pragma we are
15899 -- interested appears as the second entry in SPARK_Pragma.
15901 elsif Present
(SPARK_Pragma
(Spec_Id
))
15902 and then Mode_Is_Off
(Next_Pragma
(SPARK_Pragma
(Spec_Id
)))
15906 -- The spec defines at least one abstract state and the body has no way
15907 -- of circumventing the refinement.
15912 end Requires_State_Refinement
;
15914 ------------------------------
15915 -- Requires_Transient_Scope --
15916 ------------------------------
15918 -- A transient scope is required when variable-sized temporaries are
15919 -- allocated in the primary or secondary stack, or when finalization
15920 -- actions must be generated before the next instruction.
15922 function Requires_Transient_Scope
(Id
: Entity_Id
) return Boolean is
15923 Typ
: constant Entity_Id
:= Underlying_Type
(Id
);
15925 -- Start of processing for Requires_Transient_Scope
15928 -- This is a private type which is not completed yet. This can only
15929 -- happen in a default expression (of a formal parameter or of a
15930 -- record component). Do not expand transient scope in this case
15935 -- Do not expand transient scope for non-existent procedure return
15937 elsif Typ
= Standard_Void_Type
then
15940 -- Elementary types do not require a transient scope
15942 elsif Is_Elementary_Type
(Typ
) then
15945 -- Generally, indefinite subtypes require a transient scope, since the
15946 -- back end cannot generate temporaries, since this is not a valid type
15947 -- for declaring an object. It might be possible to relax this in the
15948 -- future, e.g. by declaring the maximum possible space for the type.
15950 elsif Is_Indefinite_Subtype
(Typ
) then
15953 -- Functions returning tagged types may dispatch on result so their
15954 -- returned value is allocated on the secondary stack. Controlled
15955 -- type temporaries need finalization.
15957 elsif Is_Tagged_Type
(Typ
)
15958 or else Has_Controlled_Component
(Typ
)
15960 return not Is_Value_Type
(Typ
);
15964 elsif Is_Record_Type
(Typ
) then
15968 Comp
:= First_Entity
(Typ
);
15969 while Present
(Comp
) loop
15970 if Ekind
(Comp
) = E_Component
15971 and then Requires_Transient_Scope
(Etype
(Comp
))
15975 Next_Entity
(Comp
);
15982 -- String literal types never require transient scope
15984 elsif Ekind
(Typ
) = E_String_Literal_Subtype
then
15987 -- Array type. Note that we already know that this is a constrained
15988 -- array, since unconstrained arrays will fail the indefinite test.
15990 elsif Is_Array_Type
(Typ
) then
15992 -- If component type requires a transient scope, the array does too
15994 if Requires_Transient_Scope
(Component_Type
(Typ
)) then
15997 -- Otherwise, we only need a transient scope if the size depends on
15998 -- the value of one or more discriminants.
16001 return Size_Depends_On_Discriminant
(Typ
);
16004 -- All other cases do not require a transient scope
16009 end Requires_Transient_Scope
;
16011 --------------------------
16012 -- Reset_Analyzed_Flags --
16013 --------------------------
16015 procedure Reset_Analyzed_Flags
(N
: Node_Id
) is
16017 function Clear_Analyzed
(N
: Node_Id
) return Traverse_Result
;
16018 -- Function used to reset Analyzed flags in tree. Note that we do
16019 -- not reset Analyzed flags in entities, since there is no need to
16020 -- reanalyze entities, and indeed, it is wrong to do so, since it
16021 -- can result in generating auxiliary stuff more than once.
16023 --------------------
16024 -- Clear_Analyzed --
16025 --------------------
16027 function Clear_Analyzed
(N
: Node_Id
) return Traverse_Result
is
16029 if not Has_Extension
(N
) then
16030 Set_Analyzed
(N
, False);
16034 end Clear_Analyzed
;
16036 procedure Reset_Analyzed
is new Traverse_Proc
(Clear_Analyzed
);
16038 -- Start of processing for Reset_Analyzed_Flags
16041 Reset_Analyzed
(N
);
16042 end Reset_Analyzed_Flags
;
16044 ------------------------
16045 -- Restore_SPARK_Mode --
16046 ------------------------
16048 procedure Restore_SPARK_Mode
(Mode
: SPARK_Mode_Type
) is
16050 SPARK_Mode
:= Mode
;
16051 end Restore_SPARK_Mode
;
16053 --------------------------------
16054 -- Returns_Unconstrained_Type --
16055 --------------------------------
16057 function Returns_Unconstrained_Type
(Subp
: Entity_Id
) return Boolean is
16059 return Ekind
(Subp
) = E_Function
16060 and then not Is_Scalar_Type
(Etype
(Subp
))
16061 and then not Is_Access_Type
(Etype
(Subp
))
16062 and then not Is_Constrained
(Etype
(Subp
));
16063 end Returns_Unconstrained_Type
;
16065 ----------------------------
16066 -- Root_Type_Of_Full_View --
16067 ----------------------------
16069 function Root_Type_Of_Full_View
(T
: Entity_Id
) return Entity_Id
is
16070 Rtyp
: constant Entity_Id
:= Root_Type
(T
);
16073 -- The root type of the full view may itself be a private type. Keep
16074 -- looking for the ultimate derivation parent.
16076 if Is_Private_Type
(Rtyp
) and then Present
(Full_View
(Rtyp
)) then
16077 return Root_Type_Of_Full_View
(Full_View
(Rtyp
));
16081 end Root_Type_Of_Full_View
;
16083 ---------------------------
16084 -- Safe_To_Capture_Value --
16085 ---------------------------
16087 function Safe_To_Capture_Value
16090 Cond
: Boolean := False) return Boolean
16093 -- The only entities for which we track constant values are variables
16094 -- which are not renamings, constants, out parameters, and in out
16095 -- parameters, so check if we have this case.
16097 -- Note: it may seem odd to track constant values for constants, but in
16098 -- fact this routine is used for other purposes than simply capturing
16099 -- the value. In particular, the setting of Known[_Non]_Null.
16101 if (Ekind
(Ent
) = E_Variable
and then No
(Renamed_Object
(Ent
)))
16103 Ekind_In
(Ent
, E_Constant
, E_Out_Parameter
, E_In_Out_Parameter
)
16107 -- For conditionals, we also allow loop parameters and all formals,
16108 -- including in parameters.
16110 elsif Cond
and then Ekind_In
(Ent
, E_Loop_Parameter
, E_In_Parameter
) then
16113 -- For all other cases, not just unsafe, but impossible to capture
16114 -- Current_Value, since the above are the only entities which have
16115 -- Current_Value fields.
16121 -- Skip if volatile or aliased, since funny things might be going on in
16122 -- these cases which we cannot necessarily track. Also skip any variable
16123 -- for which an address clause is given, or whose address is taken. Also
16124 -- never capture value of library level variables (an attempt to do so
16125 -- can occur in the case of package elaboration code).
16127 if Treat_As_Volatile
(Ent
)
16128 or else Is_Aliased
(Ent
)
16129 or else Present
(Address_Clause
(Ent
))
16130 or else Address_Taken
(Ent
)
16131 or else (Is_Library_Level_Entity
(Ent
)
16132 and then Ekind
(Ent
) = E_Variable
)
16137 -- OK, all above conditions are met. We also require that the scope of
16138 -- the reference be the same as the scope of the entity, not counting
16139 -- packages and blocks and loops.
16142 E_Scope
: constant Entity_Id
:= Scope
(Ent
);
16143 R_Scope
: Entity_Id
;
16146 R_Scope
:= Current_Scope
;
16147 while R_Scope
/= Standard_Standard
loop
16148 exit when R_Scope
= E_Scope
;
16150 if not Ekind_In
(R_Scope
, E_Package
, E_Block
, E_Loop
) then
16153 R_Scope
:= Scope
(R_Scope
);
16158 -- We also require that the reference does not appear in a context
16159 -- where it is not sure to be executed (i.e. a conditional context
16160 -- or an exception handler). We skip this if Cond is True, since the
16161 -- capturing of values from conditional tests handles this ok.
16174 -- Seems dubious that case expressions are not handled here ???
16177 while Present
(P
) loop
16178 if Nkind
(P
) = N_If_Statement
16179 or else Nkind
(P
) = N_Case_Statement
16180 or else (Nkind
(P
) in N_Short_Circuit
16181 and then Desc
= Right_Opnd
(P
))
16182 or else (Nkind
(P
) = N_If_Expression
16183 and then Desc
/= First
(Expressions
(P
)))
16184 or else Nkind
(P
) = N_Exception_Handler
16185 or else Nkind
(P
) = N_Selective_Accept
16186 or else Nkind
(P
) = N_Conditional_Entry_Call
16187 or else Nkind
(P
) = N_Timed_Entry_Call
16188 or else Nkind
(P
) = N_Asynchronous_Select
16196 -- A special Ada 2012 case: the original node may be part
16197 -- of the else_actions of a conditional expression, in which
16198 -- case it might not have been expanded yet, and appears in
16199 -- a non-syntactic list of actions. In that case it is clearly
16200 -- not safe to save a value.
16203 and then Is_List_Member
(Desc
)
16204 and then No
(Parent
(List_Containing
(Desc
)))
16212 -- OK, looks safe to set value
16215 end Safe_To_Capture_Value
;
16221 function Same_Name
(N1
, N2
: Node_Id
) return Boolean is
16222 K1
: constant Node_Kind
:= Nkind
(N1
);
16223 K2
: constant Node_Kind
:= Nkind
(N2
);
16226 if (K1
= N_Identifier
or else K1
= N_Defining_Identifier
)
16227 and then (K2
= N_Identifier
or else K2
= N_Defining_Identifier
)
16229 return Chars
(N1
) = Chars
(N2
);
16231 elsif (K1
= N_Selected_Component
or else K1
= N_Expanded_Name
)
16232 and then (K2
= N_Selected_Component
or else K2
= N_Expanded_Name
)
16234 return Same_Name
(Selector_Name
(N1
), Selector_Name
(N2
))
16235 and then Same_Name
(Prefix
(N1
), Prefix
(N2
));
16246 function Same_Object
(Node1
, Node2
: Node_Id
) return Boolean is
16247 N1
: constant Node_Id
:= Original_Node
(Node1
);
16248 N2
: constant Node_Id
:= Original_Node
(Node2
);
16249 -- We do the tests on original nodes, since we are most interested
16250 -- in the original source, not any expansion that got in the way.
16252 K1
: constant Node_Kind
:= Nkind
(N1
);
16253 K2
: constant Node_Kind
:= Nkind
(N2
);
16256 -- First case, both are entities with same entity
16258 if K1
in N_Has_Entity
and then K2
in N_Has_Entity
then
16260 EN1
: constant Entity_Id
:= Entity
(N1
);
16261 EN2
: constant Entity_Id
:= Entity
(N2
);
16263 if Present
(EN1
) and then Present
(EN2
)
16264 and then (Ekind_In
(EN1
, E_Variable
, E_Constant
)
16265 or else Is_Formal
(EN1
))
16273 -- Second case, selected component with same selector, same record
16275 if K1
= N_Selected_Component
16276 and then K2
= N_Selected_Component
16277 and then Chars
(Selector_Name
(N1
)) = Chars
(Selector_Name
(N2
))
16279 return Same_Object
(Prefix
(N1
), Prefix
(N2
));
16281 -- Third case, indexed component with same subscripts, same array
16283 elsif K1
= N_Indexed_Component
16284 and then K2
= N_Indexed_Component
16285 and then Same_Object
(Prefix
(N1
), Prefix
(N2
))
16290 E1
:= First
(Expressions
(N1
));
16291 E2
:= First
(Expressions
(N2
));
16292 while Present
(E1
) loop
16293 if not Same_Value
(E1
, E2
) then
16304 -- Fourth case, slice of same array with same bounds
16307 and then K2
= N_Slice
16308 and then Nkind
(Discrete_Range
(N1
)) = N_Range
16309 and then Nkind
(Discrete_Range
(N2
)) = N_Range
16310 and then Same_Value
(Low_Bound
(Discrete_Range
(N1
)),
16311 Low_Bound
(Discrete_Range
(N2
)))
16312 and then Same_Value
(High_Bound
(Discrete_Range
(N1
)),
16313 High_Bound
(Discrete_Range
(N2
)))
16315 return Same_Name
(Prefix
(N1
), Prefix
(N2
));
16317 -- All other cases, not clearly the same object
16328 function Same_Type
(T1
, T2
: Entity_Id
) return Boolean is
16333 elsif not Is_Constrained
(T1
)
16334 and then not Is_Constrained
(T2
)
16335 and then Base_Type
(T1
) = Base_Type
(T2
)
16339 -- For now don't bother with case of identical constraints, to be
16340 -- fiddled with later on perhaps (this is only used for optimization
16341 -- purposes, so it is not critical to do a best possible job)
16352 function Same_Value
(Node1
, Node2
: Node_Id
) return Boolean is
16354 if Compile_Time_Known_Value
(Node1
)
16355 and then Compile_Time_Known_Value
(Node2
)
16356 and then Expr_Value
(Node1
) = Expr_Value
(Node2
)
16359 elsif Same_Object
(Node1
, Node2
) then
16366 -----------------------------
16367 -- Save_SPARK_Mode_And_Set --
16368 -----------------------------
16370 procedure Save_SPARK_Mode_And_Set
16371 (Context
: Entity_Id
;
16372 Mode
: out SPARK_Mode_Type
)
16375 -- Save the current mode in effect
16377 Mode
:= SPARK_Mode
;
16379 -- Do not consider illegal or partially decorated constructs
16381 if Ekind
(Context
) = E_Void
or else Error_Posted
(Context
) then
16384 elsif Present
(SPARK_Pragma
(Context
)) then
16385 SPARK_Mode
:= Get_SPARK_Mode_From_Pragma
(SPARK_Pragma
(Context
));
16387 end Save_SPARK_Mode_And_Set
;
16389 -------------------------
16390 -- Scalar_Part_Present --
16391 -------------------------
16393 function Scalar_Part_Present
(T
: Entity_Id
) return Boolean is
16397 if Is_Scalar_Type
(T
) then
16400 elsif Is_Array_Type
(T
) then
16401 return Scalar_Part_Present
(Component_Type
(T
));
16403 elsif Is_Record_Type
(T
) or else Has_Discriminants
(T
) then
16404 C
:= First_Component_Or_Discriminant
(T
);
16405 while Present
(C
) loop
16406 if Scalar_Part_Present
(Etype
(C
)) then
16409 Next_Component_Or_Discriminant
(C
);
16415 end Scalar_Part_Present
;
16417 ------------------------
16418 -- Scope_Is_Transient --
16419 ------------------------
16421 function Scope_Is_Transient
return Boolean is
16423 return Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Transient
;
16424 end Scope_Is_Transient
;
16430 function Scope_Within
(Scope1
, Scope2
: Entity_Id
) return Boolean is
16435 while Scop
/= Standard_Standard
loop
16436 Scop
:= Scope
(Scop
);
16438 if Scop
= Scope2
then
16446 --------------------------
16447 -- Scope_Within_Or_Same --
16448 --------------------------
16450 function Scope_Within_Or_Same
(Scope1
, Scope2
: Entity_Id
) return Boolean is
16455 while Scop
/= Standard_Standard
loop
16456 if Scop
= Scope2
then
16459 Scop
:= Scope
(Scop
);
16464 end Scope_Within_Or_Same
;
16466 --------------------
16467 -- Set_Convention --
16468 --------------------
16470 procedure Set_Convention
(E
: Entity_Id
; Val
: Snames
.Convention_Id
) is
16472 Basic_Set_Convention
(E
, Val
);
16475 and then Is_Access_Subprogram_Type
(Base_Type
(E
))
16476 and then Has_Foreign_Convention
(E
)
16478 Set_Can_Use_Internal_Rep
(E
, False);
16481 -- If E is an object or component, and the type of E is an anonymous
16482 -- access type with no convention set, then also set the convention of
16483 -- the anonymous access type. We do not do this for anonymous protected
16484 -- types, since protected types always have the default convention.
16486 if Present
(Etype
(E
))
16487 and then (Is_Object
(E
)
16488 or else Ekind
(E
) = E_Component
16490 -- Allow E_Void (happens for pragma Convention appearing
16491 -- in the middle of a record applying to a component)
16493 or else Ekind
(E
) = E_Void
)
16496 Typ
: constant Entity_Id
:= Etype
(E
);
16499 if Ekind_In
(Typ
, E_Anonymous_Access_Type
,
16500 E_Anonymous_Access_Subprogram_Type
)
16501 and then not Has_Convention_Pragma
(Typ
)
16503 Basic_Set_Convention
(Typ
, Val
);
16504 Set_Has_Convention_Pragma
(Typ
);
16506 -- And for the access subprogram type, deal similarly with the
16507 -- designated E_Subprogram_Type if it is also internal (which
16510 if Ekind
(Typ
) = E_Anonymous_Access_Subprogram_Type
then
16512 Dtype
: constant Entity_Id
:= Designated_Type
(Typ
);
16514 if Ekind
(Dtype
) = E_Subprogram_Type
16515 and then Is_Itype
(Dtype
)
16516 and then not Has_Convention_Pragma
(Dtype
)
16518 Basic_Set_Convention
(Dtype
, Val
);
16519 Set_Has_Convention_Pragma
(Dtype
);
16526 end Set_Convention
;
16528 ------------------------
16529 -- Set_Current_Entity --
16530 ------------------------
16532 -- The given entity is to be set as the currently visible definition of its
16533 -- associated name (i.e. the Node_Id associated with its name). All we have
16534 -- to do is to get the name from the identifier, and then set the
16535 -- associated Node_Id to point to the given entity.
16537 procedure Set_Current_Entity
(E
: Entity_Id
) is
16539 Set_Name_Entity_Id
(Chars
(E
), E
);
16540 end Set_Current_Entity
;
16542 ---------------------------
16543 -- Set_Debug_Info_Needed --
16544 ---------------------------
16546 procedure Set_Debug_Info_Needed
(T
: Entity_Id
) is
16548 procedure Set_Debug_Info_Needed_If_Not_Set
(E
: Entity_Id
);
16549 pragma Inline
(Set_Debug_Info_Needed_If_Not_Set
);
16550 -- Used to set debug info in a related node if not set already
16552 --------------------------------------
16553 -- Set_Debug_Info_Needed_If_Not_Set --
16554 --------------------------------------
16556 procedure Set_Debug_Info_Needed_If_Not_Set
(E
: Entity_Id
) is
16558 if Present
(E
) and then not Needs_Debug_Info
(E
) then
16559 Set_Debug_Info_Needed
(E
);
16561 -- For a private type, indicate that the full view also needs
16562 -- debug information.
16565 and then Is_Private_Type
(E
)
16566 and then Present
(Full_View
(E
))
16568 Set_Debug_Info_Needed
(Full_View
(E
));
16571 end Set_Debug_Info_Needed_If_Not_Set
;
16573 -- Start of processing for Set_Debug_Info_Needed
16576 -- Nothing to do if argument is Empty or has Debug_Info_Off set, which
16577 -- indicates that Debug_Info_Needed is never required for the entity.
16578 -- Nothing to do if entity comes from a predefined file. Library files
16579 -- are compiled without debug information, but inlined bodies of these
16580 -- routines may appear in user code, and debug information on them ends
16581 -- up complicating debugging the user code.
16584 or else Debug_Info_Off
(T
)
16588 elsif In_Inlined_Body
16589 and then Is_Predefined_File_Name
16590 (Unit_File_Name
(Get_Source_Unit
(Sloc
(T
))))
16592 Set_Needs_Debug_Info
(T
, False);
16595 -- Set flag in entity itself. Note that we will go through the following
16596 -- circuitry even if the flag is already set on T. That's intentional,
16597 -- it makes sure that the flag will be set in subsidiary entities.
16599 Set_Needs_Debug_Info
(T
);
16601 -- Set flag on subsidiary entities if not set already
16603 if Is_Object
(T
) then
16604 Set_Debug_Info_Needed_If_Not_Set
(Etype
(T
));
16606 elsif Is_Type
(T
) then
16607 Set_Debug_Info_Needed_If_Not_Set
(Etype
(T
));
16609 if Is_Record_Type
(T
) then
16611 Ent
: Entity_Id
:= First_Entity
(T
);
16613 while Present
(Ent
) loop
16614 Set_Debug_Info_Needed_If_Not_Set
(Ent
);
16619 -- For a class wide subtype, we also need debug information
16620 -- for the equivalent type.
16622 if Ekind
(T
) = E_Class_Wide_Subtype
then
16623 Set_Debug_Info_Needed_If_Not_Set
(Equivalent_Type
(T
));
16626 elsif Is_Array_Type
(T
) then
16627 Set_Debug_Info_Needed_If_Not_Set
(Component_Type
(T
));
16630 Indx
: Node_Id
:= First_Index
(T
);
16632 while Present
(Indx
) loop
16633 Set_Debug_Info_Needed_If_Not_Set
(Etype
(Indx
));
16634 Indx
:= Next_Index
(Indx
);
16638 -- For a packed array type, we also need debug information for
16639 -- the type used to represent the packed array. Conversely, we
16640 -- also need it for the former if we need it for the latter.
16642 if Is_Packed
(T
) then
16643 Set_Debug_Info_Needed_If_Not_Set
(Packed_Array_Impl_Type
(T
));
16646 if Is_Packed_Array_Impl_Type
(T
) then
16647 Set_Debug_Info_Needed_If_Not_Set
(Original_Array_Type
(T
));
16650 elsif Is_Access_Type
(T
) then
16651 Set_Debug_Info_Needed_If_Not_Set
(Directly_Designated_Type
(T
));
16653 elsif Is_Private_Type
(T
) then
16654 Set_Debug_Info_Needed_If_Not_Set
(Full_View
(T
));
16656 elsif Is_Protected_Type
(T
) then
16657 Set_Debug_Info_Needed_If_Not_Set
(Corresponding_Record_Type
(T
));
16659 elsif Is_Scalar_Type
(T
) then
16661 -- If the subrange bounds are materialized by dedicated constant
16662 -- objects, also include them in the debug info to make sure the
16663 -- debugger can properly use them.
16665 if Present
(Scalar_Range
(T
))
16666 and then Nkind
(Scalar_Range
(T
)) = N_Range
16669 Low_Bnd
: constant Node_Id
:= Type_Low_Bound
(T
);
16670 High_Bnd
: constant Node_Id
:= Type_High_Bound
(T
);
16673 if Is_Entity_Name
(Low_Bnd
) then
16674 Set_Debug_Info_Needed_If_Not_Set
(Entity
(Low_Bnd
));
16677 if Is_Entity_Name
(High_Bnd
) then
16678 Set_Debug_Info_Needed_If_Not_Set
(Entity
(High_Bnd
));
16684 end Set_Debug_Info_Needed
;
16686 ----------------------------
16687 -- Set_Entity_With_Checks --
16688 ----------------------------
16690 procedure Set_Entity_With_Checks
(N
: Node_Id
; Val
: Entity_Id
) is
16691 Val_Actual
: Entity_Id
;
16693 Post_Node
: Node_Id
;
16696 -- Unconditionally set the entity
16698 Set_Entity
(N
, Val
);
16700 -- The node to post on is the selector in the case of an expanded name,
16701 -- and otherwise the node itself.
16703 if Nkind
(N
) = N_Expanded_Name
then
16704 Post_Node
:= Selector_Name
(N
);
16709 -- Check for violation of No_Fixed_IO
16711 if Restriction_Check_Required
(No_Fixed_IO
)
16713 ((RTU_Loaded
(Ada_Text_IO
)
16714 and then (Is_RTE
(Val
, RE_Decimal_IO
)
16716 Is_RTE
(Val
, RE_Fixed_IO
)))
16719 (RTU_Loaded
(Ada_Wide_Text_IO
)
16720 and then (Is_RTE
(Val
, RO_WT_Decimal_IO
)
16722 Is_RTE
(Val
, RO_WT_Fixed_IO
)))
16725 (RTU_Loaded
(Ada_Wide_Wide_Text_IO
)
16726 and then (Is_RTE
(Val
, RO_WW_Decimal_IO
)
16728 Is_RTE
(Val
, RO_WW_Fixed_IO
))))
16730 -- A special extra check, don't complain about a reference from within
16731 -- the Ada.Interrupts package itself!
16733 and then not In_Same_Extended_Unit
(N
, Val
)
16735 Check_Restriction
(No_Fixed_IO
, Post_Node
);
16738 -- Remaining checks are only done on source nodes. Note that we test
16739 -- for violation of No_Fixed_IO even on non-source nodes, because the
16740 -- cases for checking violations of this restriction are instantiations
16741 -- where the reference in the instance has Comes_From_Source False.
16743 if not Comes_From_Source
(N
) then
16747 -- Check for violation of No_Abort_Statements, which is triggered by
16748 -- call to Ada.Task_Identification.Abort_Task.
16750 if Restriction_Check_Required
(No_Abort_Statements
)
16751 and then (Is_RTE
(Val
, RE_Abort_Task
))
16753 -- A special extra check, don't complain about a reference from within
16754 -- the Ada.Task_Identification package itself!
16756 and then not In_Same_Extended_Unit
(N
, Val
)
16758 Check_Restriction
(No_Abort_Statements
, Post_Node
);
16761 if Val
= Standard_Long_Long_Integer
then
16762 Check_Restriction
(No_Long_Long_Integers
, Post_Node
);
16765 -- Check for violation of No_Dynamic_Attachment
16767 if Restriction_Check_Required
(No_Dynamic_Attachment
)
16768 and then RTU_Loaded
(Ada_Interrupts
)
16769 and then (Is_RTE
(Val
, RE_Is_Reserved
) or else
16770 Is_RTE
(Val
, RE_Is_Attached
) or else
16771 Is_RTE
(Val
, RE_Current_Handler
) or else
16772 Is_RTE
(Val
, RE_Attach_Handler
) or else
16773 Is_RTE
(Val
, RE_Exchange_Handler
) or else
16774 Is_RTE
(Val
, RE_Detach_Handler
) or else
16775 Is_RTE
(Val
, RE_Reference
))
16777 -- A special extra check, don't complain about a reference from within
16778 -- the Ada.Interrupts package itself!
16780 and then not In_Same_Extended_Unit
(N
, Val
)
16782 Check_Restriction
(No_Dynamic_Attachment
, Post_Node
);
16785 -- Check for No_Implementation_Identifiers
16787 if Restriction_Check_Required
(No_Implementation_Identifiers
) then
16789 -- We have an implementation defined entity if it is marked as
16790 -- implementation defined, or is defined in a package marked as
16791 -- implementation defined. However, library packages themselves
16792 -- are excluded (we don't want to flag Interfaces itself, just
16793 -- the entities within it).
16795 if (Is_Implementation_Defined
(Val
)
16797 (Present
(Scope
(Val
))
16798 and then Is_Implementation_Defined
(Scope
(Val
))))
16799 and then not (Ekind_In
(Val
, E_Package
, E_Generic_Package
)
16800 and then Is_Library_Level_Entity
(Val
))
16802 Check_Restriction
(No_Implementation_Identifiers
, Post_Node
);
16806 -- Do the style check
16809 and then not Suppress_Style_Checks
(Val
)
16810 and then not In_Instance
16812 if Nkind
(N
) = N_Identifier
then
16814 elsif Nkind
(N
) = N_Expanded_Name
then
16815 Nod
:= Selector_Name
(N
);
16820 -- A special situation arises for derived operations, where we want
16821 -- to do the check against the parent (since the Sloc of the derived
16822 -- operation points to the derived type declaration itself).
16825 while not Comes_From_Source
(Val_Actual
)
16826 and then Nkind
(Val_Actual
) in N_Entity
16827 and then (Ekind
(Val_Actual
) = E_Enumeration_Literal
16828 or else Is_Subprogram_Or_Generic_Subprogram
(Val_Actual
))
16829 and then Present
(Alias
(Val_Actual
))
16831 Val_Actual
:= Alias
(Val_Actual
);
16834 -- Renaming declarations for generic actuals do not come from source,
16835 -- and have a different name from that of the entity they rename, so
16836 -- there is no style check to perform here.
16838 if Chars
(Nod
) = Chars
(Val_Actual
) then
16839 Style
.Check_Identifier
(Nod
, Val_Actual
);
16843 Set_Entity
(N
, Val
);
16844 end Set_Entity_With_Checks
;
16846 ------------------------
16847 -- Set_Name_Entity_Id --
16848 ------------------------
16850 procedure Set_Name_Entity_Id
(Id
: Name_Id
; Val
: Entity_Id
) is
16852 Set_Name_Table_Info
(Id
, Int
(Val
));
16853 end Set_Name_Entity_Id
;
16855 ---------------------
16856 -- Set_Next_Actual --
16857 ---------------------
16859 procedure Set_Next_Actual
(Ass1_Id
: Node_Id
; Ass2_Id
: Node_Id
) is
16861 if Nkind
(Parent
(Ass1_Id
)) = N_Parameter_Association
then
16862 Set_First_Named_Actual
(Parent
(Ass1_Id
), Ass2_Id
);
16864 end Set_Next_Actual
;
16866 ----------------------------------
16867 -- Set_Optimize_Alignment_Flags --
16868 ----------------------------------
16870 procedure Set_Optimize_Alignment_Flags
(E
: Entity_Id
) is
16872 if Optimize_Alignment
= 'S' then
16873 Set_Optimize_Alignment_Space
(E
);
16874 elsif Optimize_Alignment
= 'T' then
16875 Set_Optimize_Alignment_Time
(E
);
16877 end Set_Optimize_Alignment_Flags
;
16879 -----------------------
16880 -- Set_Public_Status --
16881 -----------------------
16883 procedure Set_Public_Status
(Id
: Entity_Id
) is
16884 S
: constant Entity_Id
:= Current_Scope
;
16886 function Within_HSS_Or_If
(E
: Entity_Id
) return Boolean;
16887 -- Determines if E is defined within handled statement sequence or
16888 -- an if statement, returns True if so, False otherwise.
16890 ----------------------
16891 -- Within_HSS_Or_If --
16892 ----------------------
16894 function Within_HSS_Or_If
(E
: Entity_Id
) return Boolean is
16897 N
:= Declaration_Node
(E
);
16904 elsif Nkind_In
(N
, N_Handled_Sequence_Of_Statements
,
16910 end Within_HSS_Or_If
;
16912 -- Start of processing for Set_Public_Status
16915 -- Everything in the scope of Standard is public
16917 if S
= Standard_Standard
then
16918 Set_Is_Public
(Id
);
16920 -- Entity is definitely not public if enclosing scope is not public
16922 elsif not Is_Public
(S
) then
16925 -- An object or function declaration that occurs in a handled sequence
16926 -- of statements or within an if statement is the declaration for a
16927 -- temporary object or local subprogram generated by the expander. It
16928 -- never needs to be made public and furthermore, making it public can
16929 -- cause back end problems.
16931 elsif Nkind_In
(Parent
(Id
), N_Object_Declaration
,
16932 N_Function_Specification
)
16933 and then Within_HSS_Or_If
(Id
)
16937 -- Entities in public packages or records are public
16939 elsif Ekind
(S
) = E_Package
or Is_Record_Type
(S
) then
16940 Set_Is_Public
(Id
);
16942 -- The bounds of an entry family declaration can generate object
16943 -- declarations that are visible to the back-end, e.g. in the
16944 -- the declaration of a composite type that contains tasks.
16946 elsif Is_Concurrent_Type
(S
)
16947 and then not Has_Completion
(S
)
16948 and then Nkind
(Parent
(Id
)) = N_Object_Declaration
16950 Set_Is_Public
(Id
);
16952 end Set_Public_Status
;
16954 -----------------------------
16955 -- Set_Referenced_Modified --
16956 -----------------------------
16958 procedure Set_Referenced_Modified
(N
: Node_Id
; Out_Param
: Boolean) is
16962 -- Deal with indexed or selected component where prefix is modified
16964 if Nkind_In
(N
, N_Indexed_Component
, N_Selected_Component
) then
16965 Pref
:= Prefix
(N
);
16967 -- If prefix is access type, then it is the designated object that is
16968 -- being modified, which means we have no entity to set the flag on.
16970 if No
(Etype
(Pref
)) or else Is_Access_Type
(Etype
(Pref
)) then
16973 -- Otherwise chase the prefix
16976 Set_Referenced_Modified
(Pref
, Out_Param
);
16979 -- Otherwise see if we have an entity name (only other case to process)
16981 elsif Is_Entity_Name
(N
) and then Present
(Entity
(N
)) then
16982 Set_Referenced_As_LHS
(Entity
(N
), not Out_Param
);
16983 Set_Referenced_As_Out_Parameter
(Entity
(N
), Out_Param
);
16985 end Set_Referenced_Modified
;
16987 ----------------------------
16988 -- Set_Scope_Is_Transient --
16989 ----------------------------
16991 procedure Set_Scope_Is_Transient
(V
: Boolean := True) is
16993 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Transient
:= V
;
16994 end Set_Scope_Is_Transient
;
16996 -------------------
16997 -- Set_Size_Info --
16998 -------------------
17000 procedure Set_Size_Info
(T1
, T2
: Entity_Id
) is
17002 -- We copy Esize, but not RM_Size, since in general RM_Size is
17003 -- subtype specific and does not get inherited by all subtypes.
17005 Set_Esize
(T1
, Esize
(T2
));
17006 Set_Has_Biased_Representation
(T1
, Has_Biased_Representation
(T2
));
17008 if Is_Discrete_Or_Fixed_Point_Type
(T1
)
17010 Is_Discrete_Or_Fixed_Point_Type
(T2
)
17012 Set_Is_Unsigned_Type
(T1
, Is_Unsigned_Type
(T2
));
17015 Set_Alignment
(T1
, Alignment
(T2
));
17018 --------------------
17019 -- Static_Boolean --
17020 --------------------
17022 function Static_Boolean
(N
: Node_Id
) return Uint
is
17024 Analyze_And_Resolve
(N
, Standard_Boolean
);
17027 or else Error_Posted
(N
)
17028 or else Etype
(N
) = Any_Type
17033 if Is_OK_Static_Expression
(N
) then
17034 if not Raises_Constraint_Error
(N
) then
17035 return Expr_Value
(N
);
17040 elsif Etype
(N
) = Any_Type
then
17044 Flag_Non_Static_Expr
17045 ("static boolean expression required here", N
);
17048 end Static_Boolean
;
17050 --------------------
17051 -- Static_Integer --
17052 --------------------
17054 function Static_Integer
(N
: Node_Id
) return Uint
is
17056 Analyze_And_Resolve
(N
, Any_Integer
);
17059 or else Error_Posted
(N
)
17060 or else Etype
(N
) = Any_Type
17065 if Is_OK_Static_Expression
(N
) then
17066 if not Raises_Constraint_Error
(N
) then
17067 return Expr_Value
(N
);
17072 elsif Etype
(N
) = Any_Type
then
17076 Flag_Non_Static_Expr
17077 ("static integer expression required here", N
);
17080 end Static_Integer
;
17082 --------------------------
17083 -- Statically_Different --
17084 --------------------------
17086 function Statically_Different
(E1
, E2
: Node_Id
) return Boolean is
17087 R1
: constant Node_Id
:= Get_Referenced_Object
(E1
);
17088 R2
: constant Node_Id
:= Get_Referenced_Object
(E2
);
17090 return Is_Entity_Name
(R1
)
17091 and then Is_Entity_Name
(R2
)
17092 and then Entity
(R1
) /= Entity
(R2
)
17093 and then not Is_Formal
(Entity
(R1
))
17094 and then not Is_Formal
(Entity
(R2
));
17095 end Statically_Different
;
17097 --------------------------------------
17098 -- Subject_To_Loop_Entry_Attributes --
17099 --------------------------------------
17101 function Subject_To_Loop_Entry_Attributes
(N
: Node_Id
) return Boolean is
17107 -- The expansion mechanism transform a loop subject to at least one
17108 -- 'Loop_Entry attribute into a conditional block. Infinite loops lack
17109 -- the conditional part.
17111 if Nkind_In
(Stmt
, N_Block_Statement
, N_If_Statement
)
17112 and then Nkind
(Original_Node
(N
)) = N_Loop_Statement
17114 Stmt
:= Original_Node
(N
);
17118 Nkind
(Stmt
) = N_Loop_Statement
17119 and then Present
(Identifier
(Stmt
))
17120 and then Present
(Entity
(Identifier
(Stmt
)))
17121 and then Has_Loop_Entry_Attributes
(Entity
(Identifier
(Stmt
)));
17122 end Subject_To_Loop_Entry_Attributes
;
17124 -----------------------------
17125 -- Subprogram_Access_Level --
17126 -----------------------------
17128 function Subprogram_Access_Level
(Subp
: Entity_Id
) return Uint
is
17130 if Present
(Alias
(Subp
)) then
17131 return Subprogram_Access_Level
(Alias
(Subp
));
17133 return Scope_Depth
(Enclosing_Dynamic_Scope
(Subp
));
17135 end Subprogram_Access_Level
;
17137 -------------------------------
17138 -- Support_Atomic_Primitives --
17139 -------------------------------
17141 function Support_Atomic_Primitives
(Typ
: Entity_Id
) return Boolean is
17145 -- Verify the alignment of Typ is known
17147 if not Known_Alignment
(Typ
) then
17151 if Known_Static_Esize
(Typ
) then
17152 Size
:= UI_To_Int
(Esize
(Typ
));
17154 -- If the Esize (Object_Size) is unknown at compile time, look at the
17155 -- RM_Size (Value_Size) which may have been set by an explicit rep item.
17157 elsif Known_Static_RM_Size
(Typ
) then
17158 Size
:= UI_To_Int
(RM_Size
(Typ
));
17160 -- Otherwise, the size is considered to be unknown.
17166 -- Check that the size of the component is 8, 16, 32 or 64 bits and that
17167 -- Typ is properly aligned.
17170 when 8 |
16 |
32 |
64 =>
17171 return Size
= UI_To_Int
(Alignment
(Typ
)) * 8;
17175 end Support_Atomic_Primitives
;
17181 procedure Trace_Scope
(N
: Node_Id
; E
: Entity_Id
; Msg
: String) is
17183 if Debug_Flag_W
then
17184 for J
in 0 .. Scope_Stack
.Last
loop
17189 Write_Name
(Chars
(E
));
17190 Write_Str
(" from ");
17191 Write_Location
(Sloc
(N
));
17196 -----------------------
17197 -- Transfer_Entities --
17198 -----------------------
17200 procedure Transfer_Entities
(From
: Entity_Id
; To
: Entity_Id
) is
17201 Ent
: Entity_Id
:= First_Entity
(From
);
17208 if (Last_Entity
(To
)) = Empty
then
17209 Set_First_Entity
(To
, Ent
);
17211 Set_Next_Entity
(Last_Entity
(To
), Ent
);
17214 Set_Last_Entity
(To
, Last_Entity
(From
));
17216 while Present
(Ent
) loop
17217 Set_Scope
(Ent
, To
);
17219 if not Is_Public
(Ent
) then
17220 Set_Public_Status
(Ent
);
17222 if Is_Public
(Ent
) and then Ekind
(Ent
) = E_Record_Subtype
then
17224 -- The components of the propagated Itype must also be public
17229 Comp
:= First_Entity
(Ent
);
17230 while Present
(Comp
) loop
17231 Set_Is_Public
(Comp
);
17232 Next_Entity
(Comp
);
17241 Set_First_Entity
(From
, Empty
);
17242 Set_Last_Entity
(From
, Empty
);
17243 end Transfer_Entities
;
17245 -----------------------
17246 -- Type_Access_Level --
17247 -----------------------
17249 function Type_Access_Level
(Typ
: Entity_Id
) return Uint
is
17253 Btyp
:= Base_Type
(Typ
);
17255 -- Ada 2005 (AI-230): For most cases of anonymous access types, we
17256 -- simply use the level where the type is declared. This is true for
17257 -- stand-alone object declarations, and for anonymous access types
17258 -- associated with components the level is the same as that of the
17259 -- enclosing composite type. However, special treatment is needed for
17260 -- the cases of access parameters, return objects of an anonymous access
17261 -- type, and, in Ada 95, access discriminants of limited types.
17263 if Is_Access_Type
(Btyp
) then
17264 if Ekind
(Btyp
) = E_Anonymous_Access_Type
then
17266 -- If the type is a nonlocal anonymous access type (such as for
17267 -- an access parameter) we treat it as being declared at the
17268 -- library level to ensure that names such as X.all'access don't
17269 -- fail static accessibility checks.
17271 if not Is_Local_Anonymous_Access
(Typ
) then
17272 return Scope_Depth
(Standard_Standard
);
17274 -- If this is a return object, the accessibility level is that of
17275 -- the result subtype of the enclosing function. The test here is
17276 -- little complicated, because we have to account for extended
17277 -- return statements that have been rewritten as blocks, in which
17278 -- case we have to find and the Is_Return_Object attribute of the
17279 -- itype's associated object. It would be nice to find a way to
17280 -- simplify this test, but it doesn't seem worthwhile to add a new
17281 -- flag just for purposes of this test. ???
17283 elsif Ekind
(Scope
(Btyp
)) = E_Return_Statement
17286 and then Nkind
(Associated_Node_For_Itype
(Btyp
)) =
17287 N_Object_Declaration
17288 and then Is_Return_Object
17289 (Defining_Identifier
17290 (Associated_Node_For_Itype
(Btyp
))))
17296 Scop
:= Scope
(Scope
(Btyp
));
17297 while Present
(Scop
) loop
17298 exit when Ekind
(Scop
) = E_Function
;
17299 Scop
:= Scope
(Scop
);
17302 -- Treat the return object's type as having the level of the
17303 -- function's result subtype (as per RM05-6.5(5.3/2)).
17305 return Type_Access_Level
(Etype
(Scop
));
17310 Btyp
:= Root_Type
(Btyp
);
17312 -- The accessibility level of anonymous access types associated with
17313 -- discriminants is that of the current instance of the type, and
17314 -- that's deeper than the type itself (AARM 3.10.2 (12.3.21)).
17316 -- AI-402: access discriminants have accessibility based on the
17317 -- object rather than the type in Ada 2005, so the above paragraph
17320 -- ??? Needs completion with rules from AI-416
17322 if Ada_Version
<= Ada_95
17323 and then Ekind
(Typ
) = E_Anonymous_Access_Type
17324 and then Present
(Associated_Node_For_Itype
(Typ
))
17325 and then Nkind
(Associated_Node_For_Itype
(Typ
)) =
17326 N_Discriminant_Specification
17328 return Scope_Depth
(Enclosing_Dynamic_Scope
(Btyp
)) + 1;
17332 -- Return library level for a generic formal type. This is done because
17333 -- RM(10.3.2) says that "The statically deeper relationship does not
17334 -- apply to ... a descendant of a generic formal type". Rather than
17335 -- checking at each point where a static accessibility check is
17336 -- performed to see if we are dealing with a formal type, this rule is
17337 -- implemented by having Type_Access_Level and Deepest_Type_Access_Level
17338 -- return extreme values for a formal type; Deepest_Type_Access_Level
17339 -- returns Int'Last. By calling the appropriate function from among the
17340 -- two, we ensure that the static accessibility check will pass if we
17341 -- happen to run into a formal type. More specifically, we should call
17342 -- Deepest_Type_Access_Level instead of Type_Access_Level whenever the
17343 -- call occurs as part of a static accessibility check and the error
17344 -- case is the case where the type's level is too shallow (as opposed
17347 if Is_Generic_Type
(Root_Type
(Btyp
)) then
17348 return Scope_Depth
(Standard_Standard
);
17351 return Scope_Depth
(Enclosing_Dynamic_Scope
(Btyp
));
17352 end Type_Access_Level
;
17354 ------------------------------------
17355 -- Type_Without_Stream_Operation --
17356 ------------------------------------
17358 function Type_Without_Stream_Operation
17360 Op
: TSS_Name_Type
:= TSS_Null
) return Entity_Id
17362 BT
: constant Entity_Id
:= Base_Type
(T
);
17363 Op_Missing
: Boolean;
17366 if not Restriction_Active
(No_Default_Stream_Attributes
) then
17370 if Is_Elementary_Type
(T
) then
17371 if Op
= TSS_Null
then
17373 No
(TSS
(BT
, TSS_Stream_Read
))
17374 or else No
(TSS
(BT
, TSS_Stream_Write
));
17377 Op_Missing
:= No
(TSS
(BT
, Op
));
17386 elsif Is_Array_Type
(T
) then
17387 return Type_Without_Stream_Operation
(Component_Type
(T
), Op
);
17389 elsif Is_Record_Type
(T
) then
17395 Comp
:= First_Component
(T
);
17396 while Present
(Comp
) loop
17397 C_Typ
:= Type_Without_Stream_Operation
(Etype
(Comp
), Op
);
17399 if Present
(C_Typ
) then
17403 Next_Component
(Comp
);
17409 elsif Is_Private_Type
(T
) and then Present
(Full_View
(T
)) then
17410 return Type_Without_Stream_Operation
(Full_View
(T
), Op
);
17414 end Type_Without_Stream_Operation
;
17416 ----------------------------
17417 -- Unique_Defining_Entity --
17418 ----------------------------
17420 function Unique_Defining_Entity
(N
: Node_Id
) return Entity_Id
is
17422 return Unique_Entity
(Defining_Entity
(N
));
17423 end Unique_Defining_Entity
;
17425 -------------------
17426 -- Unique_Entity --
17427 -------------------
17429 function Unique_Entity
(E
: Entity_Id
) return Entity_Id
is
17430 U
: Entity_Id
:= E
;
17436 if Present
(Full_View
(E
)) then
17437 U
:= Full_View
(E
);
17441 if Present
(Full_View
(E
)) then
17442 U
:= Full_View
(E
);
17445 when E_Package_Body
=>
17448 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
17452 U
:= Corresponding_Spec
(P
);
17454 when E_Subprogram_Body
=>
17457 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
17463 if Nkind
(P
) = N_Subprogram_Body_Stub
then
17464 if Present
(Library_Unit
(P
)) then
17466 -- Get to the function or procedure (generic) entity through
17467 -- the body entity.
17470 Unique_Entity
(Defining_Entity
(Get_Body_From_Stub
(P
)));
17473 U
:= Corresponding_Spec
(P
);
17476 when Formal_Kind
=>
17477 if Present
(Spec_Entity
(E
)) then
17478 U
:= Spec_Entity
(E
);
17492 function Unique_Name
(E
: Entity_Id
) return String is
17494 -- Names of E_Subprogram_Body or E_Package_Body entities are not
17495 -- reliable, as they may not include the overloading suffix. Instead,
17496 -- when looking for the name of E or one of its enclosing scope, we get
17497 -- the name of the corresponding Unique_Entity.
17499 function Get_Scoped_Name
(E
: Entity_Id
) return String;
17500 -- Return the name of E prefixed by all the names of the scopes to which
17501 -- E belongs, except for Standard.
17503 ---------------------
17504 -- Get_Scoped_Name --
17505 ---------------------
17507 function Get_Scoped_Name
(E
: Entity_Id
) return String is
17508 Name
: constant String := Get_Name_String
(Chars
(E
));
17510 if Has_Fully_Qualified_Name
(E
)
17511 or else Scope
(E
) = Standard_Standard
17515 return Get_Scoped_Name
(Unique_Entity
(Scope
(E
))) & "__" & Name
;
17517 end Get_Scoped_Name
;
17519 -- Start of processing for Unique_Name
17522 if E
= Standard_Standard
then
17523 return Get_Name_String
(Name_Standard
);
17525 elsif Scope
(E
) = Standard_Standard
17526 and then not (Ekind
(E
) = E_Package
or else Is_Subprogram
(E
))
17528 return Get_Name_String
(Name_Standard
) & "__" &
17529 Get_Name_String
(Chars
(E
));
17531 elsif Ekind
(E
) = E_Enumeration_Literal
then
17532 return Unique_Name
(Etype
(E
)) & "__" & Get_Name_String
(Chars
(E
));
17535 return Get_Scoped_Name
(Unique_Entity
(E
));
17539 ---------------------
17540 -- Unit_Is_Visible --
17541 ---------------------
17543 function Unit_Is_Visible
(U
: Entity_Id
) return Boolean is
17544 Curr
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
17545 Curr_Entity
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
17547 function Unit_In_Parent_Context
(Par_Unit
: Node_Id
) return Boolean;
17548 -- For a child unit, check whether unit appears in a with_clause
17551 function Unit_In_Context
(Comp_Unit
: Node_Id
) return Boolean;
17552 -- Scan the context clause of one compilation unit looking for a
17553 -- with_clause for the unit in question.
17555 ----------------------------
17556 -- Unit_In_Parent_Context --
17557 ----------------------------
17559 function Unit_In_Parent_Context
(Par_Unit
: Node_Id
) return Boolean is
17561 if Unit_In_Context
(Par_Unit
) then
17564 elsif Is_Child_Unit
(Defining_Entity
(Unit
(Par_Unit
))) then
17565 return Unit_In_Parent_Context
(Parent_Spec
(Unit
(Par_Unit
)));
17570 end Unit_In_Parent_Context
;
17572 ---------------------
17573 -- Unit_In_Context --
17574 ---------------------
17576 function Unit_In_Context
(Comp_Unit
: Node_Id
) return Boolean is
17580 Clause
:= First
(Context_Items
(Comp_Unit
));
17581 while Present
(Clause
) loop
17582 if Nkind
(Clause
) = N_With_Clause
then
17583 if Library_Unit
(Clause
) = U
then
17586 -- The with_clause may denote a renaming of the unit we are
17587 -- looking for, eg. Text_IO which renames Ada.Text_IO.
17590 Renamed_Entity
(Entity
(Name
(Clause
))) =
17591 Defining_Entity
(Unit
(U
))
17601 end Unit_In_Context
;
17603 -- Start of processing for Unit_Is_Visible
17606 -- The currrent unit is directly visible
17611 elsif Unit_In_Context
(Curr
) then
17614 -- If the current unit is a body, check the context of the spec
17616 elsif Nkind
(Unit
(Curr
)) = N_Package_Body
17618 (Nkind
(Unit
(Curr
)) = N_Subprogram_Body
17619 and then not Acts_As_Spec
(Unit
(Curr
)))
17621 if Unit_In_Context
(Library_Unit
(Curr
)) then
17626 -- If the spec is a child unit, examine the parents
17628 if Is_Child_Unit
(Curr_Entity
) then
17629 if Nkind
(Unit
(Curr
)) in N_Unit_Body
then
17631 Unit_In_Parent_Context
17632 (Parent_Spec
(Unit
(Library_Unit
(Curr
))));
17634 return Unit_In_Parent_Context
(Parent_Spec
(Unit
(Curr
)));
17640 end Unit_Is_Visible
;
17642 ------------------------------
17643 -- Universal_Interpretation --
17644 ------------------------------
17646 function Universal_Interpretation
(Opnd
: Node_Id
) return Entity_Id
is
17647 Index
: Interp_Index
;
17651 -- The argument may be a formal parameter of an operator or subprogram
17652 -- with multiple interpretations, or else an expression for an actual.
17654 if Nkind
(Opnd
) = N_Defining_Identifier
17655 or else not Is_Overloaded
(Opnd
)
17657 if Etype
(Opnd
) = Universal_Integer
17658 or else Etype
(Opnd
) = Universal_Real
17660 return Etype
(Opnd
);
17666 Get_First_Interp
(Opnd
, Index
, It
);
17667 while Present
(It
.Typ
) loop
17668 if It
.Typ
= Universal_Integer
17669 or else It
.Typ
= Universal_Real
17674 Get_Next_Interp
(Index
, It
);
17679 end Universal_Interpretation
;
17685 function Unqualify
(Expr
: Node_Id
) return Node_Id
is
17687 -- Recurse to handle unlikely case of multiple levels of qualification
17689 if Nkind
(Expr
) = N_Qualified_Expression
then
17690 return Unqualify
(Expression
(Expr
));
17692 -- Normal case, not a qualified expression
17699 -----------------------
17700 -- Visible_Ancestors --
17701 -----------------------
17703 function Visible_Ancestors
(Typ
: Entity_Id
) return Elist_Id
is
17709 pragma Assert
(Is_Record_Type
(Typ
) and then Is_Tagged_Type
(Typ
));
17711 -- Collect all the parents and progenitors of Typ. If the full-view of
17712 -- private parents and progenitors is available then it is used to
17713 -- generate the list of visible ancestors; otherwise their partial
17714 -- view is added to the resulting list.
17719 Use_Full_View
=> True);
17723 Ifaces_List
=> List_2
,
17724 Exclude_Parents
=> True,
17725 Use_Full_View
=> True);
17727 -- Join the two lists. Avoid duplications because an interface may
17728 -- simultaneously be parent and progenitor of a type.
17730 Elmt
:= First_Elmt
(List_2
);
17731 while Present
(Elmt
) loop
17732 Append_Unique_Elmt
(Node
(Elmt
), List_1
);
17737 end Visible_Ancestors
;
17739 ----------------------
17740 -- Within_Init_Proc --
17741 ----------------------
17743 function Within_Init_Proc
return Boolean is
17747 S
:= Current_Scope
;
17748 while not Is_Overloadable
(S
) loop
17749 if S
= Standard_Standard
then
17756 return Is_Init_Proc
(S
);
17757 end Within_Init_Proc
;
17763 function Within_Scope
(E
: Entity_Id
; S
: Entity_Id
) return Boolean is
17770 elsif SE
= Standard_Standard
then
17782 procedure Wrong_Type
(Expr
: Node_Id
; Expected_Type
: Entity_Id
) is
17783 Found_Type
: constant Entity_Id
:= First_Subtype
(Etype
(Expr
));
17784 Expec_Type
: constant Entity_Id
:= First_Subtype
(Expected_Type
);
17786 Matching_Field
: Entity_Id
;
17787 -- Entity to give a more precise suggestion on how to write a one-
17788 -- element positional aggregate.
17790 function Has_One_Matching_Field
return Boolean;
17791 -- Determines if Expec_Type is a record type with a single component or
17792 -- discriminant whose type matches the found type or is one dimensional
17793 -- array whose component type matches the found type. In the case of
17794 -- one discriminant, we ignore the variant parts. That's not accurate,
17795 -- but good enough for the warning.
17797 ----------------------------
17798 -- Has_One_Matching_Field --
17799 ----------------------------
17801 function Has_One_Matching_Field
return Boolean is
17805 Matching_Field
:= Empty
;
17807 if Is_Array_Type
(Expec_Type
)
17808 and then Number_Dimensions
(Expec_Type
) = 1
17809 and then Covers
(Etype
(Component_Type
(Expec_Type
)), Found_Type
)
17811 -- Use type name if available. This excludes multidimensional
17812 -- arrays and anonymous arrays.
17814 if Comes_From_Source
(Expec_Type
) then
17815 Matching_Field
:= Expec_Type
;
17817 -- For an assignment, use name of target
17819 elsif Nkind
(Parent
(Expr
)) = N_Assignment_Statement
17820 and then Is_Entity_Name
(Name
(Parent
(Expr
)))
17822 Matching_Field
:= Entity
(Name
(Parent
(Expr
)));
17827 elsif not Is_Record_Type
(Expec_Type
) then
17831 E
:= First_Entity
(Expec_Type
);
17836 elsif not Ekind_In
(E
, E_Discriminant
, E_Component
)
17837 or else Nam_In
(Chars
(E
), Name_uTag
, Name_uParent
)
17846 if not Covers
(Etype
(E
), Found_Type
) then
17849 elsif Present
(Next_Entity
(E
))
17850 and then (Ekind
(E
) = E_Component
17851 or else Ekind
(Next_Entity
(E
)) = E_Discriminant
)
17856 Matching_Field
:= E
;
17860 end Has_One_Matching_Field
;
17862 -- Start of processing for Wrong_Type
17865 -- Don't output message if either type is Any_Type, or if a message
17866 -- has already been posted for this node. We need to do the latter
17867 -- check explicitly (it is ordinarily done in Errout), because we
17868 -- are using ! to force the output of the error messages.
17870 if Expec_Type
= Any_Type
17871 or else Found_Type
= Any_Type
17872 or else Error_Posted
(Expr
)
17876 -- If one of the types is a Taft-Amendment type and the other it its
17877 -- completion, it must be an illegal use of a TAT in the spec, for
17878 -- which an error was already emitted. Avoid cascaded errors.
17880 elsif Is_Incomplete_Type
(Expec_Type
)
17881 and then Has_Completion_In_Body
(Expec_Type
)
17882 and then Full_View
(Expec_Type
) = Etype
(Expr
)
17886 elsif Is_Incomplete_Type
(Etype
(Expr
))
17887 and then Has_Completion_In_Body
(Etype
(Expr
))
17888 and then Full_View
(Etype
(Expr
)) = Expec_Type
17892 -- In an instance, there is an ongoing problem with completion of
17893 -- type derived from private types. Their structure is what Gigi
17894 -- expects, but the Etype is the parent type rather than the
17895 -- derived private type itself. Do not flag error in this case. The
17896 -- private completion is an entity without a parent, like an Itype.
17897 -- Similarly, full and partial views may be incorrect in the instance.
17898 -- There is no simple way to insure that it is consistent ???
17900 -- A similar view discrepancy can happen in an inlined body, for the
17901 -- same reason: inserted body may be outside of the original package
17902 -- and only partial views are visible at the point of insertion.
17904 elsif In_Instance
or else In_Inlined_Body
then
17905 if Etype
(Etype
(Expr
)) = Etype
(Expected_Type
)
17907 (Has_Private_Declaration
(Expected_Type
)
17908 or else Has_Private_Declaration
(Etype
(Expr
)))
17909 and then No
(Parent
(Expected_Type
))
17913 elsif Nkind
(Parent
(Expr
)) = N_Qualified_Expression
17914 and then Entity
(Subtype_Mark
(Parent
(Expr
))) = Expected_Type
17918 elsif Is_Private_Type
(Expected_Type
)
17919 and then Present
(Full_View
(Expected_Type
))
17920 and then Covers
(Full_View
(Expected_Type
), Etype
(Expr
))
17926 -- An interesting special check. If the expression is parenthesized
17927 -- and its type corresponds to the type of the sole component of the
17928 -- expected record type, or to the component type of the expected one
17929 -- dimensional array type, then assume we have a bad aggregate attempt.
17931 if Nkind
(Expr
) in N_Subexpr
17932 and then Paren_Count
(Expr
) /= 0
17933 and then Has_One_Matching_Field
17935 Error_Msg_N
("positional aggregate cannot have one component", Expr
);
17936 if Present
(Matching_Field
) then
17937 if Is_Array_Type
(Expec_Type
) then
17939 ("\write instead `&''First ='> ...`", Expr
, Matching_Field
);
17943 ("\write instead `& ='> ...`", Expr
, Matching_Field
);
17947 -- Another special check, if we are looking for a pool-specific access
17948 -- type and we found an E_Access_Attribute_Type, then we have the case
17949 -- of an Access attribute being used in a context which needs a pool-
17950 -- specific type, which is never allowed. The one extra check we make
17951 -- is that the expected designated type covers the Found_Type.
17953 elsif Is_Access_Type
(Expec_Type
)
17954 and then Ekind
(Found_Type
) = E_Access_Attribute_Type
17955 and then Ekind
(Base_Type
(Expec_Type
)) /= E_General_Access_Type
17956 and then Ekind
(Base_Type
(Expec_Type
)) /= E_Anonymous_Access_Type
17958 (Designated_Type
(Expec_Type
), Designated_Type
(Found_Type
))
17960 Error_Msg_N
-- CODEFIX
17961 ("result must be general access type!", Expr
);
17962 Error_Msg_NE
-- CODEFIX
17963 ("add ALL to }!", Expr
, Expec_Type
);
17965 -- Another special check, if the expected type is an integer type,
17966 -- but the expression is of type System.Address, and the parent is
17967 -- an addition or subtraction operation whose left operand is the
17968 -- expression in question and whose right operand is of an integral
17969 -- type, then this is an attempt at address arithmetic, so give
17970 -- appropriate message.
17972 elsif Is_Integer_Type
(Expec_Type
)
17973 and then Is_RTE
(Found_Type
, RE_Address
)
17974 and then Nkind_In
(Parent
(Expr
), N_Op_Add
, N_Op_Subtract
)
17975 and then Expr
= Left_Opnd
(Parent
(Expr
))
17976 and then Is_Integer_Type
(Etype
(Right_Opnd
(Parent
(Expr
))))
17979 ("address arithmetic not predefined in package System",
17982 ("\possible missing with/use of System.Storage_Elements",
17986 -- If the expected type is an anonymous access type, as for access
17987 -- parameters and discriminants, the error is on the designated types.
17989 elsif Ekind
(Expec_Type
) = E_Anonymous_Access_Type
then
17990 if Comes_From_Source
(Expec_Type
) then
17991 Error_Msg_NE
("expected}!", Expr
, Expec_Type
);
17994 ("expected an access type with designated}",
17995 Expr
, Designated_Type
(Expec_Type
));
17998 if Is_Access_Type
(Found_Type
)
17999 and then not Comes_From_Source
(Found_Type
)
18002 ("\\found an access type with designated}!",
18003 Expr
, Designated_Type
(Found_Type
));
18005 if From_Limited_With
(Found_Type
) then
18006 Error_Msg_NE
("\\found incomplete}!", Expr
, Found_Type
);
18007 Error_Msg_Qual_Level
:= 99;
18008 Error_Msg_NE
-- CODEFIX
18009 ("\\missing `WITH &;", Expr
, Scope
(Found_Type
));
18010 Error_Msg_Qual_Level
:= 0;
18012 Error_Msg_NE
("found}!", Expr
, Found_Type
);
18016 -- Normal case of one type found, some other type expected
18019 -- If the names of the two types are the same, see if some number
18020 -- of levels of qualification will help. Don't try more than three
18021 -- levels, and if we get to standard, it's no use (and probably
18022 -- represents an error in the compiler) Also do not bother with
18023 -- internal scope names.
18026 Expec_Scope
: Entity_Id
;
18027 Found_Scope
: Entity_Id
;
18030 Expec_Scope
:= Expec_Type
;
18031 Found_Scope
:= Found_Type
;
18033 for Levels
in Int
range 0 .. 3 loop
18034 if Chars
(Expec_Scope
) /= Chars
(Found_Scope
) then
18035 Error_Msg_Qual_Level
:= Levels
;
18039 Expec_Scope
:= Scope
(Expec_Scope
);
18040 Found_Scope
:= Scope
(Found_Scope
);
18042 exit when Expec_Scope
= Standard_Standard
18043 or else Found_Scope
= Standard_Standard
18044 or else not Comes_From_Source
(Expec_Scope
)
18045 or else not Comes_From_Source
(Found_Scope
);
18049 if Is_Record_Type
(Expec_Type
)
18050 and then Present
(Corresponding_Remote_Type
(Expec_Type
))
18052 Error_Msg_NE
("expected}!", Expr
,
18053 Corresponding_Remote_Type
(Expec_Type
));
18055 Error_Msg_NE
("expected}!", Expr
, Expec_Type
);
18058 if Is_Entity_Name
(Expr
)
18059 and then Is_Package_Or_Generic_Package
(Entity
(Expr
))
18061 Error_Msg_N
("\\found package name!", Expr
);
18063 elsif Is_Entity_Name
(Expr
)
18064 and then Ekind_In
(Entity
(Expr
), E_Procedure
, E_Generic_Procedure
)
18066 if Ekind
(Expec_Type
) = E_Access_Subprogram_Type
then
18068 ("found procedure name, possibly missing Access attribute!",
18072 ("\\found procedure name instead of function!", Expr
);
18075 elsif Nkind
(Expr
) = N_Function_Call
18076 and then Ekind
(Expec_Type
) = E_Access_Subprogram_Type
18077 and then Etype
(Designated_Type
(Expec_Type
)) = Etype
(Expr
)
18078 and then No
(Parameter_Associations
(Expr
))
18081 ("found function name, possibly missing Access attribute!",
18084 -- Catch common error: a prefix or infix operator which is not
18085 -- directly visible because the type isn't.
18087 elsif Nkind
(Expr
) in N_Op
18088 and then Is_Overloaded
(Expr
)
18089 and then not Is_Immediately_Visible
(Expec_Type
)
18090 and then not Is_Potentially_Use_Visible
(Expec_Type
)
18091 and then not In_Use
(Expec_Type
)
18092 and then Has_Compatible_Type
(Right_Opnd
(Expr
), Expec_Type
)
18095 ("operator of the type is not directly visible!", Expr
);
18097 elsif Ekind
(Found_Type
) = E_Void
18098 and then Present
(Parent
(Found_Type
))
18099 and then Nkind
(Parent
(Found_Type
)) = N_Full_Type_Declaration
18101 Error_Msg_NE
("\\found premature usage of}!", Expr
, Found_Type
);
18104 Error_Msg_NE
("\\found}!", Expr
, Found_Type
);
18107 -- A special check for cases like M1 and M2 = 0 where M1 and M2 are
18108 -- of the same modular type, and (M1 and M2) = 0 was intended.
18110 if Expec_Type
= Standard_Boolean
18111 and then Is_Modular_Integer_Type
(Found_Type
)
18112 and then Nkind_In
(Parent
(Expr
), N_Op_And
, N_Op_Or
, N_Op_Xor
)
18113 and then Nkind
(Right_Opnd
(Parent
(Expr
))) in N_Op_Compare
18116 Op
: constant Node_Id
:= Right_Opnd
(Parent
(Expr
));
18117 L
: constant Node_Id
:= Left_Opnd
(Op
);
18118 R
: constant Node_Id
:= Right_Opnd
(Op
);
18121 -- The case for the message is when the left operand of the
18122 -- comparison is the same modular type, or when it is an
18123 -- integer literal (or other universal integer expression),
18124 -- which would have been typed as the modular type if the
18125 -- parens had been there.
18127 if (Etype
(L
) = Found_Type
18129 Etype
(L
) = Universal_Integer
)
18130 and then Is_Integer_Type
(Etype
(R
))
18133 ("\\possible missing parens for modular operation", Expr
);
18138 -- Reset error message qualification indication
18140 Error_Msg_Qual_Level
:= 0;