1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2015, 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 Einfo
; use Einfo
;
32 with Elists
; use Elists
;
33 with Errout
; use Errout
;
34 with Exp_Aggr
; use Exp_Aggr
;
35 with Exp_Ch6
; use Exp_Ch6
;
36 with Exp_Ch7
; use Exp_Ch7
;
37 with Inline
; use Inline
;
38 with Itypes
; use Itypes
;
40 with Nlists
; use Nlists
;
41 with Nmake
; use Nmake
;
43 with Restrict
; use Restrict
;
44 with Rident
; use Rident
;
46 with Sem_Aux
; use Sem_Aux
;
47 with Sem_Ch8
; use Sem_Ch8
;
48 with Sem_Eval
; use Sem_Eval
;
49 with Sem_Res
; use Sem_Res
;
50 with Sem_Type
; use Sem_Type
;
51 with Sem_Util
; use Sem_Util
;
52 with Snames
; use Snames
;
53 with Stand
; use Stand
;
54 with Stringt
; use Stringt
;
55 with Targparm
; use Targparm
;
56 with Tbuild
; use Tbuild
;
57 with Ttypes
; use Ttypes
;
58 with Urealp
; use Urealp
;
59 with Validsw
; use Validsw
;
61 package body Exp_Util
is
63 -----------------------
64 -- Local Subprograms --
65 -----------------------
67 function Build_Task_Array_Image
71 Dyn
: Boolean := False) return Node_Id
;
72 -- Build function to generate the image string for a task that is an array
73 -- component, concatenating the images of each index. To avoid storage
74 -- leaks, the string is built with successive slice assignments. The flag
75 -- Dyn indicates whether this is called for the initialization procedure of
76 -- an array of tasks, or for the name of a dynamically created task that is
77 -- assigned to an indexed component.
79 function Build_Task_Image_Function
83 Res
: Entity_Id
) return Node_Id
;
84 -- Common processing for Task_Array_Image and Task_Record_Image. Build
85 -- function body that computes image.
87 procedure Build_Task_Image_Prefix
96 -- Common processing for Task_Array_Image and Task_Record_Image. Create
97 -- local variables and assign prefix of name to result string.
99 function Build_Task_Record_Image
102 Dyn
: Boolean := False) return Node_Id
;
103 -- Build function to generate the image string for a task that is a record
104 -- component. Concatenate name of variable with that of selector. The flag
105 -- Dyn indicates whether this is called for the initialization procedure of
106 -- record with task components, or for a dynamically created task that is
107 -- assigned to a selected component.
109 procedure Evaluate_Slice_Bounds
(Slice
: Node_Id
);
110 -- Force evaluation of bounds of a slice, which may be given by a range
111 -- or by a subtype indication with or without a constraint.
113 function Make_CW_Equivalent_Type
115 E
: Node_Id
) return Entity_Id
;
116 -- T is a class-wide type entity, E is the initial expression node that
117 -- constrains T in case such as: " X: T := E" or "new T'(E)". This function
118 -- returns the entity of the Equivalent type and inserts on the fly the
119 -- necessary declaration such as:
121 -- type anon is record
122 -- _parent : Root_Type (T); constrained with E discriminants (if any)
123 -- Extension : String (1 .. expr to match size of E);
126 -- This record is compatible with any object of the class of T thanks to
127 -- the first field and has the same size as E thanks to the second.
129 function Make_Literal_Range
131 Literal_Typ
: Entity_Id
) return Node_Id
;
132 -- Produce a Range node whose bounds are:
133 -- Low_Bound (Literal_Type) ..
134 -- Low_Bound (Literal_Type) + (Length (Literal_Typ) - 1)
135 -- this is used for expanding declarations like X : String := "sdfgdfg";
137 -- If the index type of the target array is not integer, we generate:
138 -- Low_Bound (Literal_Type) ..
140 -- (Literal_Type'Pos (Low_Bound (Literal_Type))
141 -- + (Length (Literal_Typ) -1))
143 function Make_Non_Empty_Check
145 N
: Node_Id
) return Node_Id
;
146 -- Produce a boolean expression checking that the unidimensional array
147 -- node N is not empty.
149 function New_Class_Wide_Subtype
151 N
: Node_Id
) return Entity_Id
;
152 -- Create an implicit subtype of CW_Typ attached to node N
154 function Requires_Cleanup_Actions
157 Nested_Constructs
: Boolean) return Boolean;
158 -- Given a list L, determine whether it contains one of the following:
160 -- 1) controlled objects
161 -- 2) library-level tagged types
163 -- Lib_Level is True when the list comes from a construct at the library
164 -- level, and False otherwise. Nested_Constructs is True when any nested
165 -- packages declared in L must be processed, and False otherwise.
167 -------------------------------------
168 -- Activate_Atomic_Synchronization --
169 -------------------------------------
171 procedure Activate_Atomic_Synchronization
(N
: Node_Id
) is
175 case Nkind
(Parent
(N
)) is
177 -- Check for cases of appearing in the prefix of a construct where
178 -- we don't need atomic synchronization for this kind of usage.
181 -- Nothing to do if we are the prefix of an attribute, since we
182 -- do not want an atomic sync operation for things like 'Size.
184 N_Attribute_Reference |
186 -- The N_Reference node is like an attribute
190 -- Nothing to do for a reference to a component (or components)
191 -- of a composite object. Only reads and updates of the object
192 -- as a whole require atomic synchronization (RM C.6 (15)).
194 N_Indexed_Component |
195 N_Selected_Component |
198 -- For all the above cases, nothing to do if we are the prefix
200 if Prefix
(Parent
(N
)) = N
then
207 -- Go ahead and set the flag
209 Set_Atomic_Sync_Required
(N
);
211 -- Generate info message if requested
213 if Warn_On_Atomic_Synchronization
then
218 when N_Selected_Component | N_Expanded_Name
=>
219 Msg_Node
:= Selector_Name
(N
);
221 when N_Explicit_Dereference | N_Indexed_Component
=>
225 pragma Assert
(False);
229 if Present
(Msg_Node
) then
231 ("info: atomic synchronization set for &?N?", Msg_Node
);
234 ("info: atomic synchronization set?N?", N
);
237 end Activate_Atomic_Synchronization
;
239 ----------------------
240 -- Adjust_Condition --
241 ----------------------
243 procedure Adjust_Condition
(N
: Node_Id
) is
250 Loc
: constant Source_Ptr
:= Sloc
(N
);
251 T
: constant Entity_Id
:= Etype
(N
);
255 -- Defend against a call where the argument has no type, or has a
256 -- type that is not Boolean. This can occur because of prior errors.
258 if No
(T
) or else not Is_Boolean_Type
(T
) then
262 -- Apply validity checking if needed
264 if Validity_Checks_On
and Validity_Check_Tests
then
268 -- Immediate return if standard boolean, the most common case,
269 -- where nothing needs to be done.
271 if Base_Type
(T
) = Standard_Boolean
then
275 -- Case of zero/non-zero semantics or non-standard enumeration
276 -- representation. In each case, we rewrite the node as:
278 -- ityp!(N) /= False'Enum_Rep
280 -- where ityp is an integer type with large enough size to hold any
283 if Nonzero_Is_True
(T
) or else Has_Non_Standard_Rep
(T
) then
284 if Esize
(T
) <= Esize
(Standard_Integer
) then
285 Ti
:= Standard_Integer
;
287 Ti
:= Standard_Long_Long_Integer
;
292 Left_Opnd
=> Unchecked_Convert_To
(Ti
, N
),
294 Make_Attribute_Reference
(Loc
,
295 Attribute_Name
=> Name_Enum_Rep
,
297 New_Occurrence_Of
(First_Literal
(T
), Loc
))));
298 Analyze_And_Resolve
(N
, Standard_Boolean
);
301 Rewrite
(N
, Convert_To
(Standard_Boolean
, N
));
302 Analyze_And_Resolve
(N
, Standard_Boolean
);
305 end Adjust_Condition
;
307 ------------------------
308 -- Adjust_Result_Type --
309 ------------------------
311 procedure Adjust_Result_Type
(N
: Node_Id
; T
: Entity_Id
) is
313 -- Ignore call if current type is not Standard.Boolean
315 if Etype
(N
) /= Standard_Boolean
then
319 -- If result is already of correct type, nothing to do. Note that
320 -- this will get the most common case where everything has a type
321 -- of Standard.Boolean.
323 if Base_Type
(T
) = Standard_Boolean
then
328 KP
: constant Node_Kind
:= Nkind
(Parent
(N
));
331 -- If result is to be used as a Condition in the syntax, no need
332 -- to convert it back, since if it was changed to Standard.Boolean
333 -- using Adjust_Condition, that is just fine for this usage.
335 if KP
in N_Raise_xxx_Error
or else KP
in N_Has_Condition
then
338 -- If result is an operand of another logical operation, no need
339 -- to reset its type, since Standard.Boolean is just fine, and
340 -- such operations always do Adjust_Condition on their operands.
342 elsif KP
in N_Op_Boolean
343 or else KP
in N_Short_Circuit
344 or else KP
= N_Op_Not
348 -- Otherwise we perform a conversion from the current type, which
349 -- must be Standard.Boolean, to the desired type.
353 Rewrite
(N
, Convert_To
(T
, N
));
354 Analyze_And_Resolve
(N
, T
);
358 end Adjust_Result_Type
;
360 --------------------------
361 -- Append_Freeze_Action --
362 --------------------------
364 procedure Append_Freeze_Action
(T
: Entity_Id
; N
: Node_Id
) is
368 Ensure_Freeze_Node
(T
);
369 Fnode
:= Freeze_Node
(T
);
371 if No
(Actions
(Fnode
)) then
372 Set_Actions
(Fnode
, New_List
(N
));
374 Append
(N
, Actions
(Fnode
));
377 end Append_Freeze_Action
;
379 ---------------------------
380 -- Append_Freeze_Actions --
381 ---------------------------
383 procedure Append_Freeze_Actions
(T
: Entity_Id
; L
: List_Id
) is
391 Ensure_Freeze_Node
(T
);
392 Fnode
:= Freeze_Node
(T
);
394 if No
(Actions
(Fnode
)) then
395 Set_Actions
(Fnode
, L
);
397 Append_List
(L
, Actions
(Fnode
));
399 end Append_Freeze_Actions
;
401 ------------------------------------
402 -- Build_Allocate_Deallocate_Proc --
403 ------------------------------------
405 procedure Build_Allocate_Deallocate_Proc
407 Is_Allocate
: Boolean)
409 Desig_Typ
: Entity_Id
;
412 Proc_To_Call
: Node_Id
:= Empty
;
415 function Find_Object
(E
: Node_Id
) return Node_Id
;
416 -- Given an arbitrary expression of an allocator, try to find an object
417 -- reference in it, otherwise return the original expression.
419 function Is_Allocate_Deallocate_Proc
(Subp
: Entity_Id
) return Boolean;
420 -- Determine whether subprogram Subp denotes a custom allocate or
427 function Find_Object
(E
: Node_Id
) return Node_Id
is
431 pragma Assert
(Is_Allocate
);
435 if Nkind
(Expr
) = N_Explicit_Dereference
then
436 Expr
:= Prefix
(Expr
);
438 elsif Nkind
(Expr
) = N_Qualified_Expression
then
439 Expr
:= Expression
(Expr
);
441 elsif Nkind
(Expr
) = N_Unchecked_Type_Conversion
then
443 -- When interface class-wide types are involved in allocation,
444 -- the expander introduces several levels of address arithmetic
445 -- to perform dispatch table displacement. In this scenario the
446 -- object appears as:
448 -- Tag_Ptr (Base_Address (<object>'Address))
450 -- Detect this case and utilize the whole expression as the
451 -- "object" since it now points to the proper dispatch table.
453 if Is_RTE
(Etype
(Expr
), RE_Tag_Ptr
) then
456 -- Continue to strip the object
459 Expr
:= Expression
(Expr
);
470 ---------------------------------
471 -- Is_Allocate_Deallocate_Proc --
472 ---------------------------------
474 function Is_Allocate_Deallocate_Proc
(Subp
: Entity_Id
) return Boolean is
476 -- Look for a subprogram body with only one statement which is a
477 -- call to Allocate_Any_Controlled / Deallocate_Any_Controlled.
479 if Ekind
(Subp
) = E_Procedure
480 and then Nkind
(Parent
(Parent
(Subp
))) = N_Subprogram_Body
483 HSS
: constant Node_Id
:=
484 Handled_Statement_Sequence
(Parent
(Parent
(Subp
)));
488 if Present
(Statements
(HSS
))
489 and then Nkind
(First
(Statements
(HSS
))) =
490 N_Procedure_Call_Statement
492 Proc
:= Entity
(Name
(First
(Statements
(HSS
))));
495 Is_RTE
(Proc
, RE_Allocate_Any_Controlled
)
496 or else Is_RTE
(Proc
, RE_Deallocate_Any_Controlled
);
502 end Is_Allocate_Deallocate_Proc
;
504 -- Start of processing for Build_Allocate_Deallocate_Proc
507 -- Obtain the attributes of the allocation / deallocation
509 if Nkind
(N
) = N_Free_Statement
then
510 Expr
:= Expression
(N
);
511 Ptr_Typ
:= Base_Type
(Etype
(Expr
));
512 Proc_To_Call
:= Procedure_To_Call
(N
);
515 if Nkind
(N
) = N_Object_Declaration
then
516 Expr
:= Expression
(N
);
521 -- In certain cases an allocator with a qualified expression may
522 -- be relocated and used as the initialization expression of a
526 -- Obj : Ptr_Typ := new Desig_Typ'(...);
529 -- Tmp : Ptr_Typ := new Desig_Typ'(...);
530 -- Obj : Ptr_Typ := Tmp;
532 -- Since the allocator is always marked as analyzed to avoid infinite
533 -- expansion, it will never be processed by this routine given that
534 -- the designated type needs finalization actions. Detect this case
535 -- and complete the expansion of the allocator.
537 if Nkind
(Expr
) = N_Identifier
538 and then Nkind
(Parent
(Entity
(Expr
))) = N_Object_Declaration
539 and then Nkind
(Expression
(Parent
(Entity
(Expr
)))) = N_Allocator
541 Build_Allocate_Deallocate_Proc
(Parent
(Entity
(Expr
)), True);
545 -- The allocator may have been rewritten into something else in which
546 -- case the expansion performed by this routine does not apply.
548 if Nkind
(Expr
) /= N_Allocator
then
552 Ptr_Typ
:= Base_Type
(Etype
(Expr
));
553 Proc_To_Call
:= Procedure_To_Call
(Expr
);
556 Pool_Id
:= Associated_Storage_Pool
(Ptr_Typ
);
557 Desig_Typ
:= Available_View
(Designated_Type
(Ptr_Typ
));
559 -- Handle concurrent types
561 if Is_Concurrent_Type
(Desig_Typ
)
562 and then Present
(Corresponding_Record_Type
(Desig_Typ
))
564 Desig_Typ
:= Corresponding_Record_Type
(Desig_Typ
);
567 -- Do not process allocations / deallocations without a pool
572 -- Do not process allocations on / deallocations from the secondary
575 elsif Is_RTE
(Pool_Id
, RE_SS_Pool
) then
578 -- Do not replicate the machinery if the allocator / free has already
579 -- been expanded and has a custom Allocate / Deallocate.
581 elsif Present
(Proc_To_Call
)
582 and then Is_Allocate_Deallocate_Proc
(Proc_To_Call
)
587 if Needs_Finalization
(Desig_Typ
) then
589 -- Certain run-time configurations and targets do not provide support
590 -- for controlled types.
592 if Restriction_Active
(No_Finalization
) then
595 -- Do nothing if the access type may never allocate / deallocate
598 elsif No_Pool_Assigned
(Ptr_Typ
) then
601 -- Access-to-controlled types are not supported on .NET/JVM since
602 -- these targets cannot support pools and address arithmetic.
604 elsif VM_Target
/= No_VM
then
608 -- The allocation / deallocation of a controlled object must be
609 -- chained on / detached from a finalization master.
611 pragma Assert
(Present
(Finalization_Master
(Ptr_Typ
)));
613 -- The only other kind of allocation / deallocation supported by this
614 -- routine is on / from a subpool.
616 elsif Nkind
(Expr
) = N_Allocator
617 and then No
(Subpool_Handle_Name
(Expr
))
623 Loc
: constant Source_Ptr
:= Sloc
(N
);
624 Addr_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'A');
625 Alig_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'L');
626 Proc_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'P');
627 Size_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'S');
630 Fin_Addr_Id
: Entity_Id
;
631 Fin_Mas_Act
: Node_Id
;
632 Fin_Mas_Id
: Entity_Id
;
633 Proc_To_Call
: Entity_Id
;
634 Subpool
: Node_Id
:= Empty
;
637 -- Step 1: Construct all the actuals for the call to library routine
638 -- Allocate_Any_Controlled / Deallocate_Any_Controlled.
642 Actuals
:= New_List
(New_Occurrence_Of
(Pool_Id
, Loc
));
648 if Nkind
(Expr
) = N_Allocator
then
649 Subpool
:= Subpool_Handle_Name
(Expr
);
652 -- If a subpool is present it can be an arbitrary name, so make
653 -- the actual by copying the tree.
655 if Present
(Subpool
) then
656 Append_To
(Actuals
, New_Copy_Tree
(Subpool
, New_Sloc
=> Loc
));
658 Append_To
(Actuals
, Make_Null
(Loc
));
661 -- c) Finalization master
663 if Needs_Finalization
(Desig_Typ
) then
664 Fin_Mas_Id
:= Finalization_Master
(Ptr_Typ
);
665 Fin_Mas_Act
:= New_Occurrence_Of
(Fin_Mas_Id
, Loc
);
667 -- Handle the case where the master is actually a pointer to a
668 -- master. This case arises in build-in-place functions.
670 if Is_Access_Type
(Etype
(Fin_Mas_Id
)) then
671 Append_To
(Actuals
, Fin_Mas_Act
);
674 Make_Attribute_Reference
(Loc
,
675 Prefix
=> Fin_Mas_Act
,
676 Attribute_Name
=> Name_Unrestricted_Access
));
679 Append_To
(Actuals
, Make_Null
(Loc
));
682 -- d) Finalize_Address
684 -- Primitive Finalize_Address is never generated in CodePeer mode
685 -- since it contains an Unchecked_Conversion.
687 if Needs_Finalization
(Desig_Typ
) and then not CodePeer_Mode
then
688 Fin_Addr_Id
:= Finalize_Address
(Desig_Typ
);
689 pragma Assert
(Present
(Fin_Addr_Id
));
692 Make_Attribute_Reference
(Loc
,
693 Prefix
=> New_Occurrence_Of
(Fin_Addr_Id
, Loc
),
694 Attribute_Name
=> Name_Unrestricted_Access
));
696 Append_To
(Actuals
, Make_Null
(Loc
));
704 Append_To
(Actuals
, New_Occurrence_Of
(Addr_Id
, Loc
));
705 Append_To
(Actuals
, New_Occurrence_Of
(Size_Id
, Loc
));
707 if Is_Allocate
or else not Is_Class_Wide_Type
(Desig_Typ
) then
708 Append_To
(Actuals
, New_Occurrence_Of
(Alig_Id
, Loc
));
710 -- For deallocation of class-wide types we obtain the value of
711 -- alignment from the Type Specific Record of the deallocated object.
712 -- This is needed because the frontend expansion of class-wide types
713 -- into equivalent types confuses the backend.
719 -- ... because 'Alignment applied to class-wide types is expanded
720 -- into the code that reads the value of alignment from the TSD
721 -- (see Expand_N_Attribute_Reference)
724 Unchecked_Convert_To
(RTE
(RE_Storage_Offset
),
725 Make_Attribute_Reference
(Loc
,
727 Make_Explicit_Dereference
(Loc
, Relocate_Node
(Expr
)),
728 Attribute_Name
=> Name_Alignment
)));
733 if Needs_Finalization
(Desig_Typ
) then
735 Flag_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'F');
742 Temp
:= Find_Object
(Expression
(Expr
));
747 -- Processing for allocations where the expression is a subtype
751 and then Is_Entity_Name
(Temp
)
752 and then Is_Type
(Entity
(Temp
))
757 (Needs_Finalization
(Entity
(Temp
))), Loc
);
759 -- The allocation / deallocation of a class-wide object relies
760 -- on a runtime check to determine whether the object is truly
761 -- controlled or not. Depending on this check, the finalization
762 -- machinery will request or reclaim extra storage reserved for
765 elsif Is_Class_Wide_Type
(Desig_Typ
) then
767 -- Detect a special case where interface class-wide types
768 -- are involved as the object appears as:
770 -- Tag_Ptr (Base_Address (<object>'Address))
772 -- The expression already yields the proper tag, generate:
776 if Is_RTE
(Etype
(Temp
), RE_Tag_Ptr
) then
778 Make_Explicit_Dereference
(Loc
,
779 Prefix
=> Relocate_Node
(Temp
));
781 -- In the default case, obtain the tag of the object about
782 -- to be allocated / deallocated. Generate:
788 Make_Attribute_Reference
(Loc
,
789 Prefix
=> Relocate_Node
(Temp
),
790 Attribute_Name
=> Name_Tag
);
794 -- Needs_Finalization (<Param>)
797 Make_Function_Call
(Loc
,
799 New_Occurrence_Of
(RTE
(RE_Needs_Finalization
), Loc
),
800 Parameter_Associations
=> New_List
(Param
));
802 -- Processing for generic actuals
804 elsif Is_Generic_Actual_Type
(Desig_Typ
) then
806 New_Occurrence_Of
(Boolean_Literals
807 (Needs_Finalization
(Base_Type
(Desig_Typ
))), Loc
);
809 -- The object does not require any specialized checks, it is
810 -- known to be controlled.
813 Flag_Expr
:= New_Occurrence_Of
(Standard_True
, Loc
);
816 -- Create the temporary which represents the finalization state
817 -- of the expression. Generate:
819 -- F : constant Boolean := <Flag_Expr>;
822 Make_Object_Declaration
(Loc
,
823 Defining_Identifier
=> Flag_Id
,
824 Constant_Present
=> True,
826 New_Occurrence_Of
(Standard_Boolean
, Loc
),
827 Expression
=> Flag_Expr
));
829 Append_To
(Actuals
, New_Occurrence_Of
(Flag_Id
, Loc
));
832 -- The object is not controlled
835 Append_To
(Actuals
, New_Occurrence_Of
(Standard_False
, Loc
));
842 New_Occurrence_Of
(Boolean_Literals
(Present
(Subpool
)), Loc
));
845 -- Step 2: Build a wrapper Allocate / Deallocate which internally
846 -- calls Allocate_Any_Controlled / Deallocate_Any_Controlled.
848 -- Select the proper routine to call
851 Proc_To_Call
:= RTE
(RE_Allocate_Any_Controlled
);
853 Proc_To_Call
:= RTE
(RE_Deallocate_Any_Controlled
);
856 -- Create a custom Allocate / Deallocate routine which has identical
857 -- profile to that of System.Storage_Pools.
860 Make_Subprogram_Body
(Loc
,
865 Make_Procedure_Specification
(Loc
,
866 Defining_Unit_Name
=> Proc_Id
,
867 Parameter_Specifications
=> New_List
(
869 -- P : Root_Storage_Pool
871 Make_Parameter_Specification
(Loc
,
872 Defining_Identifier
=> Make_Temporary
(Loc
, 'P'),
874 New_Occurrence_Of
(RTE
(RE_Root_Storage_Pool
), Loc
)),
878 Make_Parameter_Specification
(Loc
,
879 Defining_Identifier
=> Addr_Id
,
880 Out_Present
=> Is_Allocate
,
882 New_Occurrence_Of
(RTE
(RE_Address
), Loc
)),
886 Make_Parameter_Specification
(Loc
,
887 Defining_Identifier
=> Size_Id
,
889 New_Occurrence_Of
(RTE
(RE_Storage_Count
), Loc
)),
893 Make_Parameter_Specification
(Loc
,
894 Defining_Identifier
=> Alig_Id
,
896 New_Occurrence_Of
(RTE
(RE_Storage_Count
), Loc
)))),
898 Declarations
=> No_List
,
900 Handled_Statement_Sequence
=>
901 Make_Handled_Sequence_Of_Statements
(Loc
,
902 Statements
=> New_List
(
903 Make_Procedure_Call_Statement
(Loc
,
904 Name
=> New_Occurrence_Of
(Proc_To_Call
, Loc
),
905 Parameter_Associations
=> Actuals
)))));
907 -- The newly generated Allocate / Deallocate becomes the default
908 -- procedure to call when the back end processes the allocation /
912 Set_Procedure_To_Call
(Expr
, Proc_Id
);
914 Set_Procedure_To_Call
(N
, Proc_Id
);
917 end Build_Allocate_Deallocate_Proc
;
919 ------------------------
920 -- Build_Runtime_Call --
921 ------------------------
923 function Build_Runtime_Call
(Loc
: Source_Ptr
; RE
: RE_Id
) return Node_Id
is
925 -- If entity is not available, we can skip making the call (this avoids
926 -- junk duplicated error messages in a number of cases).
928 if not RTE_Available
(RE
) then
929 return Make_Null_Statement
(Loc
);
932 Make_Procedure_Call_Statement
(Loc
,
933 Name
=> New_Occurrence_Of
(RTE
(RE
), Loc
));
935 end Build_Runtime_Call
;
937 ------------------------
938 -- Build_SS_Mark_Call --
939 ------------------------
941 function Build_SS_Mark_Call
943 Mark
: Entity_Id
) return Node_Id
947 -- Mark : constant Mark_Id := SS_Mark;
950 Make_Object_Declaration
(Loc
,
951 Defining_Identifier
=> Mark
,
952 Constant_Present
=> True,
954 New_Occurrence_Of
(RTE
(RE_Mark_Id
), Loc
),
956 Make_Function_Call
(Loc
,
957 Name
=> New_Occurrence_Of
(RTE
(RE_SS_Mark
), Loc
)));
958 end Build_SS_Mark_Call
;
960 ---------------------------
961 -- Build_SS_Release_Call --
962 ---------------------------
964 function Build_SS_Release_Call
966 Mark
: Entity_Id
) return Node_Id
970 -- SS_Release (Mark);
973 Make_Procedure_Call_Statement
(Loc
,
975 New_Occurrence_Of
(RTE
(RE_SS_Release
), Loc
),
976 Parameter_Associations
=> New_List
(
977 New_Occurrence_Of
(Mark
, Loc
)));
978 end Build_SS_Release_Call
;
980 ----------------------------
981 -- Build_Task_Array_Image --
982 ----------------------------
984 -- This function generates the body for a function that constructs the
985 -- image string for a task that is an array component. The function is
986 -- local to the init proc for the array type, and is called for each one
987 -- of the components. The constructed image has the form of an indexed
988 -- component, whose prefix is the outer variable of the array type.
989 -- The n-dimensional array type has known indexes Index, Index2...
991 -- Id_Ref is an indexed component form created by the enclosing init proc.
992 -- Its successive indexes are Val1, Val2, ... which are the loop variables
993 -- in the loops that call the individual task init proc on each component.
995 -- The generated function has the following structure:
997 -- function F return String is
998 -- Pref : string renames Task_Name;
999 -- T1 : String := Index1'Image (Val1);
1001 -- Tn : String := indexn'image (Valn);
1002 -- Len : Integer := T1'Length + ... + Tn'Length + n + 1;
1003 -- -- Len includes commas and the end parentheses.
1004 -- Res : String (1..Len);
1005 -- Pos : Integer := Pref'Length;
1008 -- Res (1 .. Pos) := Pref;
1010 -- Res (Pos) := '(';
1012 -- Res (Pos .. Pos + T1'Length - 1) := T1;
1013 -- Pos := Pos + T1'Length;
1014 -- Res (Pos) := '.';
1017 -- Res (Pos .. Pos + Tn'Length - 1) := Tn;
1018 -- Res (Len) := ')';
1023 -- Needless to say, multidimensional arrays of tasks are rare enough that
1024 -- the bulkiness of this code is not really a concern.
1026 function Build_Task_Array_Image
1030 Dyn
: Boolean := False) return Node_Id
1032 Dims
: constant Nat
:= Number_Dimensions
(A_Type
);
1033 -- Number of dimensions for array of tasks
1035 Temps
: array (1 .. Dims
) of Entity_Id
;
1036 -- Array of temporaries to hold string for each index
1042 -- Total length of generated name
1045 -- Running index for substring assignments
1047 Pref
: constant Entity_Id
:= Make_Temporary
(Loc
, 'P');
1048 -- Name of enclosing variable, prefix of resulting name
1051 -- String to hold result
1054 -- Value of successive indexes
1057 -- Expression to compute total size of string
1060 -- Entity for name at one index position
1062 Decls
: constant List_Id
:= New_List
;
1063 Stats
: constant List_Id
:= New_List
;
1066 -- For a dynamic task, the name comes from the target variable. For a
1067 -- static one it is a formal of the enclosing init proc.
1070 Get_Name_String
(Chars
(Entity
(Prefix
(Id_Ref
))));
1072 Make_Object_Declaration
(Loc
,
1073 Defining_Identifier
=> Pref
,
1074 Object_Definition
=> New_Occurrence_Of
(Standard_String
, Loc
),
1076 Make_String_Literal
(Loc
,
1077 Strval
=> String_From_Name_Buffer
)));
1081 Make_Object_Renaming_Declaration
(Loc
,
1082 Defining_Identifier
=> Pref
,
1083 Subtype_Mark
=> New_Occurrence_Of
(Standard_String
, Loc
),
1084 Name
=> Make_Identifier
(Loc
, Name_uTask_Name
)));
1087 Indx
:= First_Index
(A_Type
);
1088 Val
:= First
(Expressions
(Id_Ref
));
1090 for J
in 1 .. Dims
loop
1091 T
:= Make_Temporary
(Loc
, 'T');
1095 Make_Object_Declaration
(Loc
,
1096 Defining_Identifier
=> T
,
1097 Object_Definition
=> New_Occurrence_Of
(Standard_String
, Loc
),
1099 Make_Attribute_Reference
(Loc
,
1100 Attribute_Name
=> Name_Image
,
1101 Prefix
=> New_Occurrence_Of
(Etype
(Indx
), Loc
),
1102 Expressions
=> New_List
(New_Copy_Tree
(Val
)))));
1108 Sum
:= Make_Integer_Literal
(Loc
, Dims
+ 1);
1114 Make_Attribute_Reference
(Loc
,
1115 Attribute_Name
=> Name_Length
,
1116 Prefix
=> New_Occurrence_Of
(Pref
, Loc
),
1117 Expressions
=> New_List
(Make_Integer_Literal
(Loc
, 1))));
1119 for J
in 1 .. Dims
loop
1124 Make_Attribute_Reference
(Loc
,
1125 Attribute_Name
=> Name_Length
,
1127 New_Occurrence_Of
(Temps
(J
), Loc
),
1128 Expressions
=> New_List
(Make_Integer_Literal
(Loc
, 1))));
1131 Build_Task_Image_Prefix
(Loc
, Len
, Res
, Pos
, Pref
, Sum
, Decls
, Stats
);
1133 Set_Character_Literal_Name
(Char_Code
(Character'Pos ('(')));
1136 Make_Assignment_Statement
(Loc
,
1138 Make_Indexed_Component
(Loc
,
1139 Prefix
=> New_Occurrence_Of
(Res
, Loc
),
1140 Expressions
=> New_List
(New_Occurrence_Of
(Pos
, Loc
))),
1142 Make_Character_Literal
(Loc
,
1144 Char_Literal_Value
=> UI_From_Int
(Character'Pos ('(')))));
1147 Make_Assignment_Statement
(Loc
,
1148 Name
=> New_Occurrence_Of
(Pos
, Loc
),
1151 Left_Opnd
=> New_Occurrence_Of
(Pos
, Loc
),
1152 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1))));
1154 for J
in 1 .. Dims
loop
1157 Make_Assignment_Statement
(Loc
,
1160 Prefix
=> New_Occurrence_Of
(Res
, Loc
),
1163 Low_Bound
=> New_Occurrence_Of
(Pos
, Loc
),
1165 Make_Op_Subtract
(Loc
,
1168 Left_Opnd
=> New_Occurrence_Of
(Pos
, Loc
),
1170 Make_Attribute_Reference
(Loc
,
1171 Attribute_Name
=> Name_Length
,
1173 New_Occurrence_Of
(Temps
(J
), Loc
),
1175 New_List
(Make_Integer_Literal
(Loc
, 1)))),
1176 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1)))),
1178 Expression
=> New_Occurrence_Of
(Temps
(J
), Loc
)));
1182 Make_Assignment_Statement
(Loc
,
1183 Name
=> New_Occurrence_Of
(Pos
, Loc
),
1186 Left_Opnd
=> New_Occurrence_Of
(Pos
, Loc
),
1188 Make_Attribute_Reference
(Loc
,
1189 Attribute_Name
=> Name_Length
,
1190 Prefix
=> New_Occurrence_Of
(Temps
(J
), Loc
),
1192 New_List
(Make_Integer_Literal
(Loc
, 1))))));
1194 Set_Character_Literal_Name
(Char_Code
(Character'Pos (',')));
1197 Make_Assignment_Statement
(Loc
,
1198 Name
=> Make_Indexed_Component
(Loc
,
1199 Prefix
=> New_Occurrence_Of
(Res
, Loc
),
1200 Expressions
=> New_List
(New_Occurrence_Of
(Pos
, Loc
))),
1202 Make_Character_Literal
(Loc
,
1204 Char_Literal_Value
=> UI_From_Int
(Character'Pos (',')))));
1207 Make_Assignment_Statement
(Loc
,
1208 Name
=> New_Occurrence_Of
(Pos
, Loc
),
1211 Left_Opnd
=> New_Occurrence_Of
(Pos
, Loc
),
1212 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1))));
1216 Set_Character_Literal_Name
(Char_Code
(Character'Pos (')')));
1219 Make_Assignment_Statement
(Loc
,
1221 Make_Indexed_Component
(Loc
,
1222 Prefix
=> New_Occurrence_Of
(Res
, Loc
),
1223 Expressions
=> New_List
(New_Occurrence_Of
(Len
, Loc
))),
1225 Make_Character_Literal
(Loc
,
1227 Char_Literal_Value
=> UI_From_Int
(Character'Pos (')')))));
1228 return Build_Task_Image_Function
(Loc
, Decls
, Stats
, Res
);
1229 end Build_Task_Array_Image
;
1231 ----------------------------
1232 -- Build_Task_Image_Decls --
1233 ----------------------------
1235 function Build_Task_Image_Decls
1239 In_Init_Proc
: Boolean := False) return List_Id
1241 Decls
: constant List_Id
:= New_List
;
1242 T_Id
: Entity_Id
:= Empty
;
1244 Expr
: Node_Id
:= Empty
;
1245 Fun
: Node_Id
:= Empty
;
1246 Is_Dyn
: constant Boolean :=
1247 Nkind
(Parent
(Id_Ref
)) = N_Assignment_Statement
1249 Nkind
(Expression
(Parent
(Id_Ref
))) = N_Allocator
;
1252 -- If Discard_Names or No_Implicit_Heap_Allocations are in effect,
1253 -- generate a dummy declaration only.
1255 if Restriction_Active
(No_Implicit_Heap_Allocations
)
1256 or else Global_Discard_Names
1258 T_Id
:= Make_Temporary
(Loc
, 'J');
1263 Make_Object_Declaration
(Loc
,
1264 Defining_Identifier
=> T_Id
,
1265 Object_Definition
=> New_Occurrence_Of
(Standard_String
, Loc
),
1267 Make_String_Literal
(Loc
,
1268 Strval
=> String_From_Name_Buffer
)));
1271 if Nkind
(Id_Ref
) = N_Identifier
1272 or else Nkind
(Id_Ref
) = N_Defining_Identifier
1274 -- For a simple variable, the image of the task is built from
1275 -- the name of the variable. To avoid possible conflict with the
1276 -- anonymous type created for a single protected object, add a
1280 Make_Defining_Identifier
(Loc
,
1281 New_External_Name
(Chars
(Id_Ref
), 'T', 1));
1283 Get_Name_String
(Chars
(Id_Ref
));
1286 Make_String_Literal
(Loc
,
1287 Strval
=> String_From_Name_Buffer
);
1289 elsif Nkind
(Id_Ref
) = N_Selected_Component
then
1291 Make_Defining_Identifier
(Loc
,
1292 New_External_Name
(Chars
(Selector_Name
(Id_Ref
)), 'T'));
1293 Fun
:= Build_Task_Record_Image
(Loc
, Id_Ref
, Is_Dyn
);
1295 elsif Nkind
(Id_Ref
) = N_Indexed_Component
then
1297 Make_Defining_Identifier
(Loc
,
1298 New_External_Name
(Chars
(A_Type
), 'N'));
1300 Fun
:= Build_Task_Array_Image
(Loc
, Id_Ref
, A_Type
, Is_Dyn
);
1304 if Present
(Fun
) then
1305 Append
(Fun
, Decls
);
1306 Expr
:= Make_Function_Call
(Loc
,
1307 Name
=> New_Occurrence_Of
(Defining_Entity
(Fun
), Loc
));
1309 if not In_Init_Proc
and then VM_Target
= No_VM
then
1310 Set_Uses_Sec_Stack
(Defining_Entity
(Fun
));
1314 Decl
:= Make_Object_Declaration
(Loc
,
1315 Defining_Identifier
=> T_Id
,
1316 Object_Definition
=> New_Occurrence_Of
(Standard_String
, Loc
),
1317 Constant_Present
=> True,
1318 Expression
=> Expr
);
1320 Append
(Decl
, Decls
);
1322 end Build_Task_Image_Decls
;
1324 -------------------------------
1325 -- Build_Task_Image_Function --
1326 -------------------------------
1328 function Build_Task_Image_Function
1332 Res
: Entity_Id
) return Node_Id
1338 Make_Simple_Return_Statement
(Loc
,
1339 Expression
=> New_Occurrence_Of
(Res
, Loc
)));
1341 Spec
:= Make_Function_Specification
(Loc
,
1342 Defining_Unit_Name
=> Make_Temporary
(Loc
, 'F'),
1343 Result_Definition
=> New_Occurrence_Of
(Standard_String
, Loc
));
1345 -- Calls to 'Image use the secondary stack, which must be cleaned up
1346 -- after the task name is built.
1348 return Make_Subprogram_Body
(Loc
,
1349 Specification
=> Spec
,
1350 Declarations
=> Decls
,
1351 Handled_Statement_Sequence
=>
1352 Make_Handled_Sequence_Of_Statements
(Loc
, Statements
=> Stats
));
1353 end Build_Task_Image_Function
;
1355 -----------------------------
1356 -- Build_Task_Image_Prefix --
1357 -----------------------------
1359 procedure Build_Task_Image_Prefix
1361 Len
: out Entity_Id
;
1362 Res
: out Entity_Id
;
1363 Pos
: out Entity_Id
;
1370 Len
:= Make_Temporary
(Loc
, 'L', Sum
);
1373 Make_Object_Declaration
(Loc
,
1374 Defining_Identifier
=> Len
,
1375 Object_Definition
=> New_Occurrence_Of
(Standard_Integer
, Loc
),
1376 Expression
=> Sum
));
1378 Res
:= Make_Temporary
(Loc
, 'R');
1381 Make_Object_Declaration
(Loc
,
1382 Defining_Identifier
=> Res
,
1383 Object_Definition
=>
1384 Make_Subtype_Indication
(Loc
,
1385 Subtype_Mark
=> New_Occurrence_Of
(Standard_String
, Loc
),
1387 Make_Index_Or_Discriminant_Constraint
(Loc
,
1391 Low_Bound
=> Make_Integer_Literal
(Loc
, 1),
1392 High_Bound
=> New_Occurrence_Of
(Len
, Loc
)))))));
1394 -- Indicate that the result is an internal temporary, so it does not
1395 -- receive a bogus initialization when declaration is expanded. This
1396 -- is both efficient, and prevents anomalies in the handling of
1397 -- dynamic objects on the secondary stack.
1399 Set_Is_Internal
(Res
);
1400 Pos
:= Make_Temporary
(Loc
, 'P');
1403 Make_Object_Declaration
(Loc
,
1404 Defining_Identifier
=> Pos
,
1405 Object_Definition
=> New_Occurrence_Of
(Standard_Integer
, Loc
)));
1407 -- Pos := Prefix'Length;
1410 Make_Assignment_Statement
(Loc
,
1411 Name
=> New_Occurrence_Of
(Pos
, Loc
),
1413 Make_Attribute_Reference
(Loc
,
1414 Attribute_Name
=> Name_Length
,
1415 Prefix
=> New_Occurrence_Of
(Prefix
, Loc
),
1416 Expressions
=> New_List
(Make_Integer_Literal
(Loc
, 1)))));
1418 -- Res (1 .. Pos) := Prefix;
1421 Make_Assignment_Statement
(Loc
,
1424 Prefix
=> New_Occurrence_Of
(Res
, Loc
),
1427 Low_Bound
=> Make_Integer_Literal
(Loc
, 1),
1428 High_Bound
=> New_Occurrence_Of
(Pos
, Loc
))),
1430 Expression
=> New_Occurrence_Of
(Prefix
, Loc
)));
1433 Make_Assignment_Statement
(Loc
,
1434 Name
=> New_Occurrence_Of
(Pos
, Loc
),
1437 Left_Opnd
=> New_Occurrence_Of
(Pos
, Loc
),
1438 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1))));
1439 end Build_Task_Image_Prefix
;
1441 -----------------------------
1442 -- Build_Task_Record_Image --
1443 -----------------------------
1445 function Build_Task_Record_Image
1448 Dyn
: Boolean := False) return Node_Id
1451 -- Total length of generated name
1454 -- Index into result
1457 -- String to hold result
1459 Pref
: constant Entity_Id
:= Make_Temporary
(Loc
, 'P');
1460 -- Name of enclosing variable, prefix of resulting name
1463 -- Expression to compute total size of string
1466 -- Entity for selector name
1468 Decls
: constant List_Id
:= New_List
;
1469 Stats
: constant List_Id
:= New_List
;
1472 -- For a dynamic task, the name comes from the target variable. For a
1473 -- static one it is a formal of the enclosing init proc.
1476 Get_Name_String
(Chars
(Entity
(Prefix
(Id_Ref
))));
1478 Make_Object_Declaration
(Loc
,
1479 Defining_Identifier
=> Pref
,
1480 Object_Definition
=> New_Occurrence_Of
(Standard_String
, Loc
),
1482 Make_String_Literal
(Loc
,
1483 Strval
=> String_From_Name_Buffer
)));
1487 Make_Object_Renaming_Declaration
(Loc
,
1488 Defining_Identifier
=> Pref
,
1489 Subtype_Mark
=> New_Occurrence_Of
(Standard_String
, Loc
),
1490 Name
=> Make_Identifier
(Loc
, Name_uTask_Name
)));
1493 Sel
:= Make_Temporary
(Loc
, 'S');
1495 Get_Name_String
(Chars
(Selector_Name
(Id_Ref
)));
1498 Make_Object_Declaration
(Loc
,
1499 Defining_Identifier
=> Sel
,
1500 Object_Definition
=> New_Occurrence_Of
(Standard_String
, Loc
),
1502 Make_String_Literal
(Loc
,
1503 Strval
=> String_From_Name_Buffer
)));
1505 Sum
:= Make_Integer_Literal
(Loc
, Nat
(Name_Len
+ 1));
1511 Make_Attribute_Reference
(Loc
,
1512 Attribute_Name
=> Name_Length
,
1514 New_Occurrence_Of
(Pref
, Loc
),
1515 Expressions
=> New_List
(Make_Integer_Literal
(Loc
, 1))));
1517 Build_Task_Image_Prefix
(Loc
, Len
, Res
, Pos
, Pref
, Sum
, Decls
, Stats
);
1519 Set_Character_Literal_Name
(Char_Code
(Character'Pos ('.')));
1521 -- Res (Pos) := '.';
1524 Make_Assignment_Statement
(Loc
,
1525 Name
=> Make_Indexed_Component
(Loc
,
1526 Prefix
=> New_Occurrence_Of
(Res
, Loc
),
1527 Expressions
=> New_List
(New_Occurrence_Of
(Pos
, Loc
))),
1529 Make_Character_Literal
(Loc
,
1531 Char_Literal_Value
=>
1532 UI_From_Int
(Character'Pos ('.')))));
1535 Make_Assignment_Statement
(Loc
,
1536 Name
=> New_Occurrence_Of
(Pos
, Loc
),
1539 Left_Opnd
=> New_Occurrence_Of
(Pos
, Loc
),
1540 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1))));
1542 -- Res (Pos .. Len) := Selector;
1545 Make_Assignment_Statement
(Loc
,
1546 Name
=> Make_Slice
(Loc
,
1547 Prefix
=> New_Occurrence_Of
(Res
, Loc
),
1550 Low_Bound
=> New_Occurrence_Of
(Pos
, Loc
),
1551 High_Bound
=> New_Occurrence_Of
(Len
, Loc
))),
1552 Expression
=> New_Occurrence_Of
(Sel
, Loc
)));
1554 return Build_Task_Image_Function
(Loc
, Decls
, Stats
, Res
);
1555 end Build_Task_Record_Image
;
1557 -----------------------------
1558 -- Check_Float_Op_Overflow --
1559 -----------------------------
1561 procedure Check_Float_Op_Overflow
(N
: Node_Id
) is
1563 -- Return if no check needed
1565 if not Is_Floating_Point_Type
(Etype
(N
))
1566 or else not (Do_Overflow_Check
(N
) and then Check_Float_Overflow
)
1568 -- In CodePeer_Mode, rely on the overflow check flag being set instead
1569 -- and do not expand the code for float overflow checking.
1571 or else CodePeer_Mode
1576 -- Otherwise we replace the expression by
1578 -- do Tnn : constant ftype := expression;
1579 -- constraint_error when not Tnn'Valid;
1583 Loc
: constant Source_Ptr
:= Sloc
(N
);
1584 Tnn
: constant Entity_Id
:= Make_Temporary
(Loc
, 'T', N
);
1585 Typ
: constant Entity_Id
:= Etype
(N
);
1588 -- Turn off the Do_Overflow_Check flag, since we are doing that work
1589 -- right here. We also set the node as analyzed to prevent infinite
1590 -- recursion from repeating the operation in the expansion.
1592 Set_Do_Overflow_Check
(N
, False);
1593 Set_Analyzed
(N
, True);
1595 -- Do the rewrite to include the check
1598 Make_Expression_With_Actions
(Loc
,
1599 Actions
=> New_List
(
1600 Make_Object_Declaration
(Loc
,
1601 Defining_Identifier
=> Tnn
,
1602 Object_Definition
=> New_Occurrence_Of
(Typ
, Loc
),
1603 Constant_Present
=> True,
1604 Expression
=> Relocate_Node
(N
)),
1605 Make_Raise_Constraint_Error
(Loc
,
1609 Make_Attribute_Reference
(Loc
,
1610 Prefix
=> New_Occurrence_Of
(Tnn
, Loc
),
1611 Attribute_Name
=> Name_Valid
)),
1612 Reason
=> CE_Overflow_Check_Failed
)),
1613 Expression
=> New_Occurrence_Of
(Tnn
, Loc
)));
1615 Analyze_And_Resolve
(N
, Typ
);
1617 end Check_Float_Op_Overflow
;
1619 ----------------------------------
1620 -- Component_May_Be_Bit_Aligned --
1621 ----------------------------------
1623 function Component_May_Be_Bit_Aligned
(Comp
: Entity_Id
) return Boolean is
1627 -- If no component clause, then everything is fine, since the back end
1628 -- never bit-misaligns by default, even if there is a pragma Packed for
1631 if No
(Comp
) or else No
(Component_Clause
(Comp
)) then
1635 UT
:= Underlying_Type
(Etype
(Comp
));
1637 -- It is only array and record types that cause trouble
1639 if not Is_Record_Type
(UT
) and then not Is_Array_Type
(UT
) then
1642 -- If we know that we have a small (64 bits or less) record or small
1643 -- bit-packed array, then everything is fine, since the back end can
1644 -- handle these cases correctly.
1646 elsif Esize
(Comp
) <= 64
1647 and then (Is_Record_Type
(UT
) or else Is_Bit_Packed_Array
(UT
))
1651 -- Otherwise if the component is not byte aligned, we know we have the
1652 -- nasty unaligned case.
1654 elsif Normalized_First_Bit
(Comp
) /= Uint_0
1655 or else Esize
(Comp
) mod System_Storage_Unit
/= Uint_0
1659 -- If we are large and byte aligned, then OK at this level
1664 end Component_May_Be_Bit_Aligned
;
1666 ----------------------------------------
1667 -- Containing_Package_With_Ext_Axioms --
1668 ----------------------------------------
1670 function Containing_Package_With_Ext_Axioms
1671 (E
: Entity_Id
) return Entity_Id
1676 if Ekind
(E
) = E_Package
then
1677 if Nkind
(Parent
(E
)) = N_Defining_Program_Unit_Name
then
1678 Decl
:= Parent
(Parent
(E
));
1684 -- E is the package or generic package which is externally axiomatized
1686 if Ekind_In
(E
, E_Package
, E_Generic_Package
)
1687 and then Has_Annotate_Pragma_For_External_Axiomatization
(E
)
1692 -- If E's scope is axiomatized, E is axiomatized.
1695 First_Ax_Parent_Scope
: Entity_Id
:= Empty
;
1698 if Present
(Scope
(E
)) then
1699 First_Ax_Parent_Scope
:=
1700 Containing_Package_With_Ext_Axioms
(Scope
(E
));
1703 if Present
(First_Ax_Parent_Scope
) then
1704 return First_Ax_Parent_Scope
;
1707 -- otherwise, if E is a package instance, it is axiomatized if the
1708 -- corresponding generic package is axiomatized.
1710 if Ekind
(E
) = E_Package
1711 and then Present
(Generic_Parent
(Decl
))
1714 Containing_Package_With_Ext_Axioms
(Generic_Parent
(Decl
));
1719 end Containing_Package_With_Ext_Axioms
;
1721 -------------------------------
1722 -- Convert_To_Actual_Subtype --
1723 -------------------------------
1725 procedure Convert_To_Actual_Subtype
(Exp
: Entity_Id
) is
1729 Act_ST
:= Get_Actual_Subtype
(Exp
);
1731 if Act_ST
= Etype
(Exp
) then
1734 Rewrite
(Exp
, Convert_To
(Act_ST
, Relocate_Node
(Exp
)));
1735 Analyze_And_Resolve
(Exp
, Act_ST
);
1737 end Convert_To_Actual_Subtype
;
1739 -----------------------------------
1740 -- Corresponding_Runtime_Package --
1741 -----------------------------------
1743 function Corresponding_Runtime_Package
(Typ
: Entity_Id
) return RTU_Id
is
1744 Pkg_Id
: RTU_Id
:= RTU_Null
;
1747 pragma Assert
(Is_Concurrent_Type
(Typ
));
1749 if Ekind
(Typ
) in Protected_Kind
then
1750 if Has_Entries
(Typ
)
1752 -- A protected type without entries that covers an interface and
1753 -- overrides the abstract routines with protected procedures is
1754 -- considered equivalent to a protected type with entries in the
1755 -- context of dispatching select statements. It is sufficient to
1756 -- check for the presence of an interface list in the declaration
1757 -- node to recognize this case.
1759 or else Present
(Interface_List
(Parent
(Typ
)))
1761 -- Protected types with interrupt handlers (when not using a
1762 -- restricted profile) are also considered equivalent to
1763 -- protected types with entries. The types which are used
1764 -- (Static_Interrupt_Protection and Dynamic_Interrupt_Protection)
1765 -- are derived from Protection_Entries.
1767 or else (Has_Attach_Handler
(Typ
) and then not Restricted_Profile
)
1768 or else Has_Interrupt_Handler
(Typ
)
1771 or else Restriction_Active
(No_Entry_Queue
) = False
1772 or else Restriction_Active
(No_Select_Statements
) = False
1773 or else Number_Entries
(Typ
) > 1
1774 or else (Has_Attach_Handler
(Typ
)
1775 and then not Restricted_Profile
)
1777 Pkg_Id
:= System_Tasking_Protected_Objects_Entries
;
1779 Pkg_Id
:= System_Tasking_Protected_Objects_Single_Entry
;
1783 Pkg_Id
:= System_Tasking_Protected_Objects
;
1788 end Corresponding_Runtime_Package
;
1790 -----------------------------------
1791 -- Current_Sem_Unit_Declarations --
1792 -----------------------------------
1794 function Current_Sem_Unit_Declarations
return List_Id
is
1795 U
: Node_Id
:= Unit
(Cunit
(Current_Sem_Unit
));
1799 -- If the current unit is a package body, locate the visible
1800 -- declarations of the package spec.
1802 if Nkind
(U
) = N_Package_Body
then
1803 U
:= Unit
(Library_Unit
(Cunit
(Current_Sem_Unit
)));
1806 if Nkind
(U
) = N_Package_Declaration
then
1807 U
:= Specification
(U
);
1808 Decls
:= Visible_Declarations
(U
);
1812 Set_Visible_Declarations
(U
, Decls
);
1816 Decls
:= Declarations
(U
);
1820 Set_Declarations
(U
, Decls
);
1825 end Current_Sem_Unit_Declarations
;
1827 -----------------------
1828 -- Duplicate_Subexpr --
1829 -----------------------
1831 function Duplicate_Subexpr
1833 Name_Req
: Boolean := False;
1834 Renaming_Req
: Boolean := False) return Node_Id
1837 Remove_Side_Effects
(Exp
, Name_Req
, Renaming_Req
);
1838 return New_Copy_Tree
(Exp
);
1839 end Duplicate_Subexpr
;
1841 ---------------------------------
1842 -- Duplicate_Subexpr_No_Checks --
1843 ---------------------------------
1845 function Duplicate_Subexpr_No_Checks
1847 Name_Req
: Boolean := False;
1848 Renaming_Req
: Boolean := False;
1849 Related_Id
: Entity_Id
:= Empty
;
1850 Is_Low_Bound
: Boolean := False;
1851 Is_High_Bound
: Boolean := False) return Node_Id
1858 Name_Req
=> Name_Req
,
1859 Renaming_Req
=> Renaming_Req
,
1860 Related_Id
=> Related_Id
,
1861 Is_Low_Bound
=> Is_Low_Bound
,
1862 Is_High_Bound
=> Is_High_Bound
);
1864 New_Exp
:= New_Copy_Tree
(Exp
);
1865 Remove_Checks
(New_Exp
);
1867 end Duplicate_Subexpr_No_Checks
;
1869 -----------------------------------
1870 -- Duplicate_Subexpr_Move_Checks --
1871 -----------------------------------
1873 function Duplicate_Subexpr_Move_Checks
1875 Name_Req
: Boolean := False;
1876 Renaming_Req
: Boolean := False) return Node_Id
1881 Remove_Side_Effects
(Exp
, Name_Req
, Renaming_Req
);
1882 New_Exp
:= New_Copy_Tree
(Exp
);
1883 Remove_Checks
(Exp
);
1885 end Duplicate_Subexpr_Move_Checks
;
1887 --------------------
1888 -- Ensure_Defined --
1889 --------------------
1891 procedure Ensure_Defined
(Typ
: Entity_Id
; N
: Node_Id
) is
1895 -- An itype reference must only be created if this is a local itype, so
1896 -- that gigi can elaborate it on the proper objstack.
1898 if Is_Itype
(Typ
) and then Scope
(Typ
) = Current_Scope
then
1899 IR
:= Make_Itype_Reference
(Sloc
(N
));
1900 Set_Itype
(IR
, Typ
);
1901 Insert_Action
(N
, IR
);
1905 --------------------
1906 -- Entry_Names_OK --
1907 --------------------
1909 function Entry_Names_OK
return Boolean is
1912 not Restricted_Profile
1913 and then not Global_Discard_Names
1914 and then not Restriction_Active
(No_Implicit_Heap_Allocations
)
1915 and then not Restriction_Active
(No_Local_Allocators
);
1922 procedure Evaluate_Name
(Nam
: Node_Id
) is
1923 K
: constant Node_Kind
:= Nkind
(Nam
);
1926 -- For an explicit dereference, we simply force the evaluation of the
1927 -- name expression. The dereference provides a value that is the address
1928 -- for the renamed object, and it is precisely this value that we want
1931 if K
= N_Explicit_Dereference
then
1932 Force_Evaluation
(Prefix
(Nam
));
1934 -- For a selected component, we simply evaluate the prefix
1936 elsif K
= N_Selected_Component
then
1937 Evaluate_Name
(Prefix
(Nam
));
1939 -- For an indexed component, or an attribute reference, we evaluate the
1940 -- prefix, which is itself a name, recursively, and then force the
1941 -- evaluation of all the subscripts (or attribute expressions).
1943 elsif Nkind_In
(K
, N_Indexed_Component
, N_Attribute_Reference
) then
1944 Evaluate_Name
(Prefix
(Nam
));
1950 E
:= First
(Expressions
(Nam
));
1951 while Present
(E
) loop
1952 Force_Evaluation
(E
);
1954 if Original_Node
(E
) /= E
then
1955 Set_Do_Range_Check
(E
, Do_Range_Check
(Original_Node
(E
)));
1962 -- For a slice, we evaluate the prefix, as for the indexed component
1963 -- case and then, if there is a range present, either directly or as the
1964 -- constraint of a discrete subtype indication, we evaluate the two
1965 -- bounds of this range.
1967 elsif K
= N_Slice
then
1968 Evaluate_Name
(Prefix
(Nam
));
1969 Evaluate_Slice_Bounds
(Nam
);
1971 -- For a type conversion, the expression of the conversion must be the
1972 -- name of an object, and we simply need to evaluate this name.
1974 elsif K
= N_Type_Conversion
then
1975 Evaluate_Name
(Expression
(Nam
));
1977 -- For a function call, we evaluate the call
1979 elsif K
= N_Function_Call
then
1980 Force_Evaluation
(Nam
);
1982 -- The remaining cases are direct name, operator symbol and character
1983 -- literal. In all these cases, we do nothing, since we want to
1984 -- reevaluate each time the renamed object is used.
1991 ---------------------------
1992 -- Evaluate_Slice_Bounds --
1993 ---------------------------
1995 procedure Evaluate_Slice_Bounds
(Slice
: Node_Id
) is
1996 DR
: constant Node_Id
:= Discrete_Range
(Slice
);
2001 if Nkind
(DR
) = N_Range
then
2002 Force_Evaluation
(Low_Bound
(DR
));
2003 Force_Evaluation
(High_Bound
(DR
));
2005 elsif Nkind
(DR
) = N_Subtype_Indication
then
2006 Constr
:= Constraint
(DR
);
2008 if Nkind
(Constr
) = N_Range_Constraint
then
2009 Rexpr
:= Range_Expression
(Constr
);
2011 Force_Evaluation
(Low_Bound
(Rexpr
));
2012 Force_Evaluation
(High_Bound
(Rexpr
));
2015 end Evaluate_Slice_Bounds
;
2017 ---------------------
2018 -- Evolve_And_Then --
2019 ---------------------
2021 procedure Evolve_And_Then
(Cond
: in out Node_Id
; Cond1
: Node_Id
) is
2027 Make_And_Then
(Sloc
(Cond1
),
2029 Right_Opnd
=> Cond1
);
2031 end Evolve_And_Then
;
2033 --------------------
2034 -- Evolve_Or_Else --
2035 --------------------
2037 procedure Evolve_Or_Else
(Cond
: in out Node_Id
; Cond1
: Node_Id
) is
2043 Make_Or_Else
(Sloc
(Cond1
),
2045 Right_Opnd
=> Cond1
);
2049 -----------------------------------------
2050 -- Expand_Static_Predicates_In_Choices --
2051 -----------------------------------------
2053 procedure Expand_Static_Predicates_In_Choices
(N
: Node_Id
) is
2054 pragma Assert
(Nkind_In
(N
, N_Case_Statement_Alternative
, N_Variant
));
2056 Choices
: constant List_Id
:= Discrete_Choices
(N
);
2064 Choice
:= First
(Choices
);
2065 while Present
(Choice
) loop
2066 Next_C
:= Next
(Choice
);
2068 -- Check for name of subtype with static predicate
2070 if Is_Entity_Name
(Choice
)
2071 and then Is_Type
(Entity
(Choice
))
2072 and then Has_Predicates
(Entity
(Choice
))
2074 -- Loop through entries in predicate list, converting to choices
2075 -- and inserting in the list before the current choice. Note that
2076 -- if the list is empty, corresponding to a False predicate, then
2077 -- no choices are inserted.
2079 P
:= First
(Static_Discrete_Predicate
(Entity
(Choice
)));
2080 while Present
(P
) loop
2082 -- If low bound and high bounds are equal, copy simple choice
2084 if Expr_Value
(Low_Bound
(P
)) = Expr_Value
(High_Bound
(P
)) then
2085 C
:= New_Copy
(Low_Bound
(P
));
2087 -- Otherwise copy a range
2093 -- Change Sloc to referencing choice (rather than the Sloc of
2094 -- the predicate declaration element itself).
2096 Set_Sloc
(C
, Sloc
(Choice
));
2097 Insert_Before
(Choice
, C
);
2101 -- Delete the predicated entry
2106 -- Move to next choice to check
2110 end Expand_Static_Predicates_In_Choices
;
2112 ------------------------------
2113 -- Expand_Subtype_From_Expr --
2114 ------------------------------
2116 -- This function is applicable for both static and dynamic allocation of
2117 -- objects which are constrained by an initial expression. Basically it
2118 -- transforms an unconstrained subtype indication into a constrained one.
2120 -- The expression may also be transformed in certain cases in order to
2121 -- avoid multiple evaluation. In the static allocation case, the general
2126 -- is transformed into
2128 -- Val : Constrained_Subtype_of_T := Maybe_Modified_Expr;
2130 -- Here are the main cases :
2132 -- <if Expr is a Slice>
2133 -- Val : T ([Index_Subtype (Expr)]) := Expr;
2135 -- <elsif Expr is a String Literal>
2136 -- Val : T (T'First .. T'First + Length (string literal) - 1) := Expr;
2138 -- <elsif Expr is Constrained>
2139 -- subtype T is Type_Of_Expr
2142 -- <elsif Expr is an entity_name>
2143 -- Val : T (constraints taken from Expr) := Expr;
2146 -- type Axxx is access all T;
2147 -- Rval : Axxx := Expr'ref;
2148 -- Val : T (constraints taken from Rval) := Rval.all;
2150 -- ??? note: when the Expression is allocated in the secondary stack
2151 -- we could use it directly instead of copying it by declaring
2152 -- Val : T (...) renames Rval.all
2154 procedure Expand_Subtype_From_Expr
2156 Unc_Type
: Entity_Id
;
2157 Subtype_Indic
: Node_Id
;
2160 Loc
: constant Source_Ptr
:= Sloc
(N
);
2161 Exp_Typ
: constant Entity_Id
:= Etype
(Exp
);
2165 -- In general we cannot build the subtype if expansion is disabled,
2166 -- because internal entities may not have been defined. However, to
2167 -- avoid some cascaded errors, we try to continue when the expression is
2168 -- an array (or string), because it is safe to compute the bounds. It is
2169 -- in fact required to do so even in a generic context, because there
2170 -- may be constants that depend on the bounds of a string literal, both
2171 -- standard string types and more generally arrays of characters.
2173 -- In GNATprove mode, these extra subtypes are not needed
2175 if GNATprove_Mode
then
2179 if not Expander_Active
2180 and then (No
(Etype
(Exp
)) or else not Is_String_Type
(Etype
(Exp
)))
2185 if Nkind
(Exp
) = N_Slice
then
2187 Slice_Type
: constant Entity_Id
:= Etype
(First_Index
(Exp_Typ
));
2190 Rewrite
(Subtype_Indic
,
2191 Make_Subtype_Indication
(Loc
,
2192 Subtype_Mark
=> New_Occurrence_Of
(Unc_Type
, Loc
),
2194 Make_Index_Or_Discriminant_Constraint
(Loc
,
2195 Constraints
=> New_List
2196 (New_Occurrence_Of
(Slice_Type
, Loc
)))));
2198 -- This subtype indication may be used later for constraint checks
2199 -- we better make sure that if a variable was used as a bound of
2200 -- of the original slice, its value is frozen.
2202 Evaluate_Slice_Bounds
(Exp
);
2205 elsif Ekind
(Exp_Typ
) = E_String_Literal_Subtype
then
2206 Rewrite
(Subtype_Indic
,
2207 Make_Subtype_Indication
(Loc
,
2208 Subtype_Mark
=> New_Occurrence_Of
(Unc_Type
, Loc
),
2210 Make_Index_Or_Discriminant_Constraint
(Loc
,
2211 Constraints
=> New_List
(
2212 Make_Literal_Range
(Loc
,
2213 Literal_Typ
=> Exp_Typ
)))));
2215 -- If the type of the expression is an internally generated type it
2216 -- may not be necessary to create a new subtype. However there are two
2217 -- exceptions: references to the current instances, and aliased array
2218 -- object declarations for which the backend needs to create a template.
2220 elsif Is_Constrained
(Exp_Typ
)
2221 and then not Is_Class_Wide_Type
(Unc_Type
)
2223 (Nkind
(N
) /= N_Object_Declaration
2224 or else not Is_Entity_Name
(Expression
(N
))
2225 or else not Comes_From_Source
(Entity
(Expression
(N
)))
2226 or else not Is_Array_Type
(Exp_Typ
)
2227 or else not Aliased_Present
(N
))
2229 if Is_Itype
(Exp_Typ
) then
2231 -- Within an initialization procedure, a selected component
2232 -- denotes a component of the enclosing record, and it appears as
2233 -- an actual in a call to its own initialization procedure. If
2234 -- this component depends on the outer discriminant, we must
2235 -- generate the proper actual subtype for it.
2237 if Nkind
(Exp
) = N_Selected_Component
2238 and then Within_Init_Proc
2241 Decl
: constant Node_Id
:=
2242 Build_Actual_Subtype_Of_Component
(Exp_Typ
, Exp
);
2244 if Present
(Decl
) then
2245 Insert_Action
(N
, Decl
);
2246 T
:= Defining_Identifier
(Decl
);
2252 -- No need to generate a new subtype
2259 T
:= Make_Temporary
(Loc
, 'T');
2262 Make_Subtype_Declaration
(Loc
,
2263 Defining_Identifier
=> T
,
2264 Subtype_Indication
=> New_Occurrence_Of
(Exp_Typ
, Loc
)));
2266 -- This type is marked as an itype even though it has an explicit
2267 -- declaration since otherwise Is_Generic_Actual_Type can get
2268 -- set, resulting in the generation of spurious errors. (See
2269 -- sem_ch8.Analyze_Package_Renaming and sem_type.covers)
2272 Set_Associated_Node_For_Itype
(T
, Exp
);
2275 Rewrite
(Subtype_Indic
, New_Occurrence_Of
(T
, Loc
));
2277 -- Nothing needs to be done for private types with unknown discriminants
2278 -- if the underlying type is not an unconstrained composite type or it
2279 -- is an unchecked union.
2281 elsif Is_Private_Type
(Unc_Type
)
2282 and then Has_Unknown_Discriminants
(Unc_Type
)
2283 and then (not Is_Composite_Type
(Underlying_Type
(Unc_Type
))
2284 or else Is_Constrained
(Underlying_Type
(Unc_Type
))
2285 or else Is_Unchecked_Union
(Underlying_Type
(Unc_Type
)))
2289 -- Case of derived type with unknown discriminants where the parent type
2290 -- also has unknown discriminants.
2292 elsif Is_Record_Type
(Unc_Type
)
2293 and then not Is_Class_Wide_Type
(Unc_Type
)
2294 and then Has_Unknown_Discriminants
(Unc_Type
)
2295 and then Has_Unknown_Discriminants
(Underlying_Type
(Unc_Type
))
2297 -- Nothing to be done if no underlying record view available
2299 if No
(Underlying_Record_View
(Unc_Type
)) then
2302 -- Otherwise use the Underlying_Record_View to create the proper
2303 -- constrained subtype for an object of a derived type with unknown
2307 Remove_Side_Effects
(Exp
);
2308 Rewrite
(Subtype_Indic
,
2309 Make_Subtype_From_Expr
(Exp
, Underlying_Record_View
(Unc_Type
)));
2312 -- Renamings of class-wide interface types require no equivalent
2313 -- constrained type declarations because we only need to reference
2314 -- the tag component associated with the interface. The same is
2315 -- presumably true for class-wide types in general, so this test
2316 -- is broadened to include all class-wide renamings, which also
2317 -- avoids cases of unbounded recursion in Remove_Side_Effects.
2318 -- (Is this really correct, or are there some cases of class-wide
2319 -- renamings that require action in this procedure???)
2322 and then Nkind
(N
) = N_Object_Renaming_Declaration
2323 and then Is_Class_Wide_Type
(Unc_Type
)
2327 -- In Ada 95 nothing to be done if the type of the expression is limited
2328 -- because in this case the expression cannot be copied, and its use can
2329 -- only be by reference.
2331 -- In Ada 2005 the context can be an object declaration whose expression
2332 -- is a function that returns in place. If the nominal subtype has
2333 -- unknown discriminants, the call still provides constraints on the
2334 -- object, and we have to create an actual subtype from it.
2336 -- If the type is class-wide, the expression is dynamically tagged and
2337 -- we do not create an actual subtype either. Ditto for an interface.
2338 -- For now this applies only if the type is immutably limited, and the
2339 -- function being called is build-in-place. This will have to be revised
2340 -- when build-in-place functions are generalized to other types.
2342 elsif Is_Limited_View
(Exp_Typ
)
2344 (Is_Class_Wide_Type
(Exp_Typ
)
2345 or else Is_Interface
(Exp_Typ
)
2346 or else not Has_Unknown_Discriminants
(Exp_Typ
)
2347 or else not Is_Composite_Type
(Unc_Type
))
2351 -- For limited objects initialized with build in place function calls,
2352 -- nothing to be done; otherwise we prematurely introduce an N_Reference
2353 -- node in the expression initializing the object, which breaks the
2354 -- circuitry that detects and adds the additional arguments to the
2357 elsif Is_Build_In_Place_Function_Call
(Exp
) then
2361 Remove_Side_Effects
(Exp
);
2362 Rewrite
(Subtype_Indic
,
2363 Make_Subtype_From_Expr
(Exp
, Unc_Type
));
2365 end Expand_Subtype_From_Expr
;
2367 ----------------------
2368 -- Finalize_Address --
2369 ----------------------
2371 function Finalize_Address
(Typ
: Entity_Id
) return Entity_Id
is
2372 Utyp
: Entity_Id
:= Typ
;
2375 -- Handle protected class-wide or task class-wide types
2377 if Is_Class_Wide_Type
(Utyp
) then
2378 if Is_Concurrent_Type
(Root_Type
(Utyp
)) then
2379 Utyp
:= Root_Type
(Utyp
);
2381 elsif Is_Private_Type
(Root_Type
(Utyp
))
2382 and then Present
(Full_View
(Root_Type
(Utyp
)))
2383 and then Is_Concurrent_Type
(Full_View
(Root_Type
(Utyp
)))
2385 Utyp
:= Full_View
(Root_Type
(Utyp
));
2389 -- Handle private types
2391 if Is_Private_Type
(Utyp
) and then Present
(Full_View
(Utyp
)) then
2392 Utyp
:= Full_View
(Utyp
);
2395 -- Handle protected and task types
2397 if Is_Concurrent_Type
(Utyp
)
2398 and then Present
(Corresponding_Record_Type
(Utyp
))
2400 Utyp
:= Corresponding_Record_Type
(Utyp
);
2403 Utyp
:= Underlying_Type
(Base_Type
(Utyp
));
2405 -- Deal with untagged derivation of private views. If the parent is
2406 -- now known to be protected, the finalization routine is the one
2407 -- defined on the corresponding record of the ancestor (corresponding
2408 -- records do not automatically inherit operations, but maybe they
2411 if Is_Untagged_Derivation
(Typ
) then
2412 if Is_Protected_Type
(Typ
) then
2413 Utyp
:= Corresponding_Record_Type
(Root_Type
(Base_Type
(Typ
)));
2416 Utyp
:= Underlying_Type
(Root_Type
(Base_Type
(Typ
)));
2418 if Is_Protected_Type
(Utyp
) then
2419 Utyp
:= Corresponding_Record_Type
(Utyp
);
2424 -- If the underlying_type is a subtype, we are dealing with the
2425 -- completion of a private type. We need to access the base type and
2426 -- generate a conversion to it.
2428 if Utyp
/= Base_Type
(Utyp
) then
2429 pragma Assert
(Is_Private_Type
(Typ
));
2431 Utyp
:= Base_Type
(Utyp
);
2434 -- When dealing with an internally built full view for a type with
2435 -- unknown discriminants, use the original record type.
2437 if Is_Underlying_Record_View
(Utyp
) then
2438 Utyp
:= Etype
(Utyp
);
2441 return TSS
(Utyp
, TSS_Finalize_Address
);
2442 end Finalize_Address
;
2444 ------------------------
2445 -- Find_Interface_ADT --
2446 ------------------------
2448 function Find_Interface_ADT
2450 Iface
: Entity_Id
) return Elmt_Id
2453 Typ
: Entity_Id
:= T
;
2456 pragma Assert
(Is_Interface
(Iface
));
2458 -- Handle private types
2460 if Has_Private_Declaration
(Typ
) and then Present
(Full_View
(Typ
)) then
2461 Typ
:= Full_View
(Typ
);
2464 -- Handle access types
2466 if Is_Access_Type
(Typ
) then
2467 Typ
:= Designated_Type
(Typ
);
2470 -- Handle task and protected types implementing interfaces
2472 if Is_Concurrent_Type
(Typ
) then
2473 Typ
:= Corresponding_Record_Type
(Typ
);
2477 (not Is_Class_Wide_Type
(Typ
)
2478 and then Ekind
(Typ
) /= E_Incomplete_Type
);
2480 if Is_Ancestor
(Iface
, Typ
, Use_Full_View
=> True) then
2481 return First_Elmt
(Access_Disp_Table
(Typ
));
2484 ADT
:= Next_Elmt
(Next_Elmt
(First_Elmt
(Access_Disp_Table
(Typ
))));
2486 and then Present
(Related_Type
(Node
(ADT
)))
2487 and then Related_Type
(Node
(ADT
)) /= Iface
2488 and then not Is_Ancestor
(Iface
, Related_Type
(Node
(ADT
)),
2489 Use_Full_View
=> True)
2494 pragma Assert
(Present
(Related_Type
(Node
(ADT
))));
2497 end Find_Interface_ADT
;
2499 ------------------------
2500 -- Find_Interface_Tag --
2501 ------------------------
2503 function Find_Interface_Tag
2505 Iface
: Entity_Id
) return Entity_Id
2508 Found
: Boolean := False;
2509 Typ
: Entity_Id
:= T
;
2511 procedure Find_Tag
(Typ
: Entity_Id
);
2512 -- Internal subprogram used to recursively climb to the ancestors
2518 procedure Find_Tag
(Typ
: Entity_Id
) is
2523 -- This routine does not handle the case in which the interface is an
2524 -- ancestor of Typ. That case is handled by the enclosing subprogram.
2526 pragma Assert
(Typ
/= Iface
);
2528 -- Climb to the root type handling private types
2530 if Present
(Full_View
(Etype
(Typ
))) then
2531 if Full_View
(Etype
(Typ
)) /= Typ
then
2532 Find_Tag
(Full_View
(Etype
(Typ
)));
2535 elsif Etype
(Typ
) /= Typ
then
2536 Find_Tag
(Etype
(Typ
));
2539 -- Traverse the list of interfaces implemented by the type
2542 and then Present
(Interfaces
(Typ
))
2543 and then not (Is_Empty_Elmt_List
(Interfaces
(Typ
)))
2545 -- Skip the tag associated with the primary table
2547 pragma Assert
(Etype
(First_Tag_Component
(Typ
)) = RTE
(RE_Tag
));
2548 AI_Tag
:= Next_Tag_Component
(First_Tag_Component
(Typ
));
2549 pragma Assert
(Present
(AI_Tag
));
2551 AI_Elmt
:= First_Elmt
(Interfaces
(Typ
));
2552 while Present
(AI_Elmt
) loop
2553 AI
:= Node
(AI_Elmt
);
2556 or else Is_Ancestor
(Iface
, AI
, Use_Full_View
=> True)
2562 AI_Tag
:= Next_Tag_Component
(AI_Tag
);
2563 Next_Elmt
(AI_Elmt
);
2568 -- Start of processing for Find_Interface_Tag
2571 pragma Assert
(Is_Interface
(Iface
));
2573 -- Handle access types
2575 if Is_Access_Type
(Typ
) then
2576 Typ
:= Designated_Type
(Typ
);
2579 -- Handle class-wide types
2581 if Is_Class_Wide_Type
(Typ
) then
2582 Typ
:= Root_Type
(Typ
);
2585 -- Handle private types
2587 if Has_Private_Declaration
(Typ
) and then Present
(Full_View
(Typ
)) then
2588 Typ
:= Full_View
(Typ
);
2591 -- Handle entities from the limited view
2593 if Ekind
(Typ
) = E_Incomplete_Type
then
2594 pragma Assert
(Present
(Non_Limited_View
(Typ
)));
2595 Typ
:= Non_Limited_View
(Typ
);
2598 -- Handle task and protected types implementing interfaces
2600 if Is_Concurrent_Type
(Typ
) then
2601 Typ
:= Corresponding_Record_Type
(Typ
);
2604 -- If the interface is an ancestor of the type, then it shared the
2605 -- primary dispatch table.
2607 if Is_Ancestor
(Iface
, Typ
, Use_Full_View
=> True) then
2608 pragma Assert
(Etype
(First_Tag_Component
(Typ
)) = RTE
(RE_Tag
));
2609 return First_Tag_Component
(Typ
);
2611 -- Otherwise we need to search for its associated tag component
2615 pragma Assert
(Found
);
2618 end Find_Interface_Tag
;
2624 function Find_Prim_Op
(T
: Entity_Id
; Name
: Name_Id
) return Entity_Id
is
2626 Typ
: Entity_Id
:= T
;
2630 if Is_Class_Wide_Type
(Typ
) then
2631 Typ
:= Root_Type
(Typ
);
2634 Typ
:= Underlying_Type
(Typ
);
2636 -- Loop through primitive operations
2638 Prim
:= First_Elmt
(Primitive_Operations
(Typ
));
2639 while Present
(Prim
) loop
2642 -- We can retrieve primitive operations by name if it is an internal
2643 -- name. For equality we must check that both of its operands have
2644 -- the same type, to avoid confusion with user-defined equalities
2645 -- than may have a non-symmetric signature.
2647 exit when Chars
(Op
) = Name
2650 or else Etype
(First_Formal
(Op
)) = Etype
(Last_Formal
(Op
)));
2654 -- Raise Program_Error if no primitive found
2657 raise Program_Error
;
2668 function Find_Prim_Op
2670 Name
: TSS_Name_Type
) return Entity_Id
2672 Inher_Op
: Entity_Id
:= Empty
;
2673 Own_Op
: Entity_Id
:= Empty
;
2674 Prim_Elmt
: Elmt_Id
;
2675 Prim_Id
: Entity_Id
;
2676 Typ
: Entity_Id
:= T
;
2679 if Is_Class_Wide_Type
(Typ
) then
2680 Typ
:= Root_Type
(Typ
);
2683 Typ
:= Underlying_Type
(Typ
);
2685 -- This search is based on the assertion that the dispatching version
2686 -- of the TSS routine always precedes the real primitive.
2688 Prim_Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
2689 while Present
(Prim_Elmt
) loop
2690 Prim_Id
:= Node
(Prim_Elmt
);
2692 if Is_TSS
(Prim_Id
, Name
) then
2693 if Present
(Alias
(Prim_Id
)) then
2694 Inher_Op
:= Prim_Id
;
2700 Next_Elmt
(Prim_Elmt
);
2703 if Present
(Own_Op
) then
2705 elsif Present
(Inher_Op
) then
2708 raise Program_Error
;
2712 ----------------------------
2713 -- Find_Protection_Object --
2714 ----------------------------
2716 function Find_Protection_Object
(Scop
: Entity_Id
) return Entity_Id
is
2721 while Present
(S
) loop
2722 if Ekind_In
(S
, E_Entry
, E_Entry_Family
, E_Function
, E_Procedure
)
2723 and then Present
(Protection_Object
(S
))
2725 return Protection_Object
(S
);
2731 -- If we do not find a Protection object in the scope chain, then
2732 -- something has gone wrong, most likely the object was never created.
2734 raise Program_Error
;
2735 end Find_Protection_Object
;
2737 --------------------------
2738 -- Find_Protection_Type --
2739 --------------------------
2741 function Find_Protection_Type
(Conc_Typ
: Entity_Id
) return Entity_Id
is
2743 Typ
: Entity_Id
:= Conc_Typ
;
2746 if Is_Concurrent_Type
(Typ
) then
2747 Typ
:= Corresponding_Record_Type
(Typ
);
2750 -- Since restriction violations are not considered serious errors, the
2751 -- expander remains active, but may leave the corresponding record type
2752 -- malformed. In such cases, component _object is not available so do
2755 if not Analyzed
(Typ
) then
2759 Comp
:= First_Component
(Typ
);
2760 while Present
(Comp
) loop
2761 if Chars
(Comp
) = Name_uObject
then
2762 return Base_Type
(Etype
(Comp
));
2765 Next_Component
(Comp
);
2768 -- The corresponding record of a protected type should always have an
2771 raise Program_Error
;
2772 end Find_Protection_Type
;
2774 -----------------------
2775 -- Find_Hook_Context --
2776 -----------------------
2778 function Find_Hook_Context
(N
: Node_Id
) return Node_Id
is
2782 Wrapped_Node
: Node_Id
;
2783 -- Note: if we are in a transient scope, we want to reuse it as
2784 -- the context for actions insertion, if possible. But if N is itself
2785 -- part of the stored actions for the current transient scope,
2786 -- then we need to insert at the appropriate (inner) location in
2787 -- the not as an action on Node_To_Be_Wrapped.
2789 In_Cond_Expr
: constant Boolean := Within_Case_Or_If_Expression
(N
);
2792 -- When the node is inside a case/if expression, the lifetime of any
2793 -- temporary controlled object is extended. Find a suitable insertion
2794 -- node by locating the topmost case or if expressions.
2796 if In_Cond_Expr
then
2799 while Present
(Par
) loop
2800 if Nkind_In
(Original_Node
(Par
), N_Case_Expression
,
2805 -- Prevent the search from going too far
2807 elsif Is_Body_Or_Package_Declaration
(Par
) then
2811 Par
:= Parent
(Par
);
2814 -- The topmost case or if expression is now recovered, but it may
2815 -- still not be the correct place to add generated code. Climb to
2816 -- find a parent that is part of a declarative or statement list,
2817 -- and is not a list of actuals in a call.
2820 while Present
(Par
) loop
2821 if Is_List_Member
(Par
)
2822 and then not Nkind_In
(Par
, N_Component_Association
,
2823 N_Discriminant_Association
,
2824 N_Parameter_Association
,
2825 N_Pragma_Argument_Association
)
2826 and then not Nkind_In
2827 (Parent
(Par
), N_Function_Call
,
2828 N_Procedure_Call_Statement
,
2829 N_Entry_Call_Statement
)
2834 -- Prevent the search from going too far
2836 elsif Is_Body_Or_Package_Declaration
(Par
) then
2840 Par
:= Parent
(Par
);
2847 while Present
(Par
) loop
2849 -- Keep climbing past various operators
2851 if Nkind
(Parent
(Par
)) in N_Op
2852 or else Nkind_In
(Parent
(Par
), N_And_Then
, N_Or_Else
)
2854 Par
:= Parent
(Par
);
2862 -- The node may be located in a pragma in which case return the
2865 -- pragma Precondition (... and then Ctrl_Func_Call ...);
2867 -- Similar case occurs when the node is related to an object
2868 -- declaration or assignment:
2870 -- Obj [: Some_Typ] := ... and then Ctrl_Func_Call ...;
2872 -- Another case to consider is when the node is part of a return
2875 -- return ... and then Ctrl_Func_Call ...;
2877 -- Another case is when the node acts as a formal in a procedure
2880 -- Proc (... and then Ctrl_Func_Call ...);
2882 if Scope_Is_Transient
then
2883 Wrapped_Node
:= Node_To_Be_Wrapped
;
2885 Wrapped_Node
:= Empty
;
2888 while Present
(Par
) loop
2889 if Par
= Wrapped_Node
2890 or else Nkind_In
(Par
, N_Assignment_Statement
,
2891 N_Object_Declaration
,
2893 N_Procedure_Call_Statement
,
2894 N_Simple_Return_Statement
)
2898 -- Prevent the search from going too far
2900 elsif Is_Body_Or_Package_Declaration
(Par
) then
2904 Par
:= Parent
(Par
);
2907 -- Return the topmost short circuit operator
2911 end Find_Hook_Context
;
2913 ------------------------------
2914 -- Following_Address_Clause --
2915 ------------------------------
2917 function Following_Address_Clause
(D
: Node_Id
) return Node_Id
is
2918 Id
: constant Entity_Id
:= Defining_Identifier
(D
);
2922 function Check_Decls
(D
: Node_Id
) return Node_Id
;
2923 -- This internal function differs from the main function in that it
2924 -- gets called to deal with a following package private part, and
2925 -- it checks declarations starting with D (the main function checks
2926 -- declarations following D). If D is Empty, then Empty is returned.
2932 function Check_Decls
(D
: Node_Id
) return Node_Id
is
2937 while Present
(Decl
) loop
2938 if Nkind
(Decl
) = N_At_Clause
2939 and then Chars
(Identifier
(Decl
)) = Chars
(Id
)
2943 elsif Nkind
(Decl
) = N_Attribute_Definition_Clause
2944 and then Chars
(Decl
) = Name_Address
2945 and then Chars
(Name
(Decl
)) = Chars
(Id
)
2953 -- Otherwise not found, return Empty
2958 -- Start of processing for Following_Address_Clause
2961 -- If parser detected no address clause for the identifier in question,
2962 -- then the answer is a quick NO, without the need for a search.
2964 if not Get_Name_Table_Boolean1
(Chars
(Id
)) then
2968 -- Otherwise search current declarative unit
2970 Result
:= Check_Decls
(Next
(D
));
2972 if Present
(Result
) then
2976 -- Check for possible package private part following
2980 if Nkind
(Par
) = N_Package_Specification
2981 and then Visible_Declarations
(Par
) = List_Containing
(D
)
2982 and then Present
(Private_Declarations
(Par
))
2984 -- Private part present, check declarations there
2986 return Check_Decls
(First
(Private_Declarations
(Par
)));
2989 -- No private part, clause not found, return Empty
2993 end Following_Address_Clause
;
2995 ----------------------
2996 -- Force_Evaluation --
2997 ----------------------
2999 procedure Force_Evaluation
3001 Name_Req
: Boolean := False;
3002 Related_Id
: Entity_Id
:= Empty
;
3003 Is_Low_Bound
: Boolean := False;
3004 Is_High_Bound
: Boolean := False)
3009 Name_Req
=> Name_Req
,
3010 Variable_Ref
=> True,
3011 Renaming_Req
=> False,
3012 Related_Id
=> Related_Id
,
3013 Is_Low_Bound
=> Is_Low_Bound
,
3014 Is_High_Bound
=> Is_High_Bound
);
3015 end Force_Evaluation
;
3017 ---------------------------------
3018 -- Fully_Qualified_Name_String --
3019 ---------------------------------
3021 function Fully_Qualified_Name_String
3023 Append_NUL
: Boolean := True) return String_Id
3025 procedure Internal_Full_Qualified_Name
(E
: Entity_Id
);
3026 -- Compute recursively the qualified name without NUL at the end, adding
3027 -- it to the currently started string being generated
3029 ----------------------------------
3030 -- Internal_Full_Qualified_Name --
3031 ----------------------------------
3033 procedure Internal_Full_Qualified_Name
(E
: Entity_Id
) is
3037 -- Deal properly with child units
3039 if Nkind
(E
) = N_Defining_Program_Unit_Name
then
3040 Ent
:= Defining_Identifier
(E
);
3045 -- Compute qualification recursively (only "Standard" has no scope)
3047 if Present
(Scope
(Scope
(Ent
))) then
3048 Internal_Full_Qualified_Name
(Scope
(Ent
));
3049 Store_String_Char
(Get_Char_Code
('.'));
3052 -- Every entity should have a name except some expanded blocks
3053 -- don't bother about those.
3055 if Chars
(Ent
) = No_Name
then
3059 -- Generates the entity name in upper case
3061 Get_Decoded_Name_String
(Chars
(Ent
));
3063 Store_String_Chars
(Name_Buffer
(1 .. Name_Len
));
3065 end Internal_Full_Qualified_Name
;
3067 -- Start of processing for Full_Qualified_Name
3071 Internal_Full_Qualified_Name
(E
);
3074 Store_String_Char
(Get_Char_Code
(ASCII
.NUL
));
3078 end Fully_Qualified_Name_String
;
3080 ------------------------
3081 -- Generate_Poll_Call --
3082 ------------------------
3084 procedure Generate_Poll_Call
(N
: Node_Id
) is
3086 -- No poll call if polling not active
3088 if not Polling_Required
then
3091 -- Otherwise generate require poll call
3094 Insert_Before_And_Analyze
(N
,
3095 Make_Procedure_Call_Statement
(Sloc
(N
),
3096 Name
=> New_Occurrence_Of
(RTE
(RE_Poll
), Sloc
(N
))));
3098 end Generate_Poll_Call
;
3100 ---------------------------------
3101 -- Get_Current_Value_Condition --
3102 ---------------------------------
3104 -- Note: the implementation of this procedure is very closely tied to the
3105 -- implementation of Set_Current_Value_Condition. In the Get procedure, we
3106 -- interpret Current_Value fields set by the Set procedure, so the two
3107 -- procedures need to be closely coordinated.
3109 procedure Get_Current_Value_Condition
3114 Loc
: constant Source_Ptr
:= Sloc
(Var
);
3115 Ent
: constant Entity_Id
:= Entity
(Var
);
3117 procedure Process_Current_Value_Condition
3120 -- N is an expression which holds either True (S = True) or False (S =
3121 -- False) in the condition. This procedure digs out the expression and
3122 -- if it refers to Ent, sets Op and Val appropriately.
3124 -------------------------------------
3125 -- Process_Current_Value_Condition --
3126 -------------------------------------
3128 procedure Process_Current_Value_Condition
3133 Prev_Cond
: Node_Id
;
3143 -- Deal with NOT operators, inverting sense
3145 while Nkind
(Cond
) = N_Op_Not
loop
3146 Cond
:= Right_Opnd
(Cond
);
3150 -- Deal with conversions, qualifications, and expressions with
3153 while Nkind_In
(Cond
,
3155 N_Qualified_Expression
,
3156 N_Expression_With_Actions
)
3158 Cond
:= Expression
(Cond
);
3161 exit when Cond
= Prev_Cond
;
3164 -- Deal with AND THEN and AND cases
3166 if Nkind_In
(Cond
, N_And_Then
, N_Op_And
) then
3168 -- Don't ever try to invert a condition that is of the form of an
3169 -- AND or AND THEN (since we are not doing sufficiently general
3170 -- processing to allow this).
3172 if Sens
= False then
3178 -- Recursively process AND and AND THEN branches
3180 Process_Current_Value_Condition
(Left_Opnd
(Cond
), True);
3182 if Op
/= N_Empty
then
3186 Process_Current_Value_Condition
(Right_Opnd
(Cond
), True);
3189 -- Case of relational operator
3191 elsif Nkind
(Cond
) in N_Op_Compare
then
3194 -- Invert sense of test if inverted test
3196 if Sens
= False then
3198 when N_Op_Eq
=> Op
:= N_Op_Ne
;
3199 when N_Op_Ne
=> Op
:= N_Op_Eq
;
3200 when N_Op_Lt
=> Op
:= N_Op_Ge
;
3201 when N_Op_Gt
=> Op
:= N_Op_Le
;
3202 when N_Op_Le
=> Op
:= N_Op_Gt
;
3203 when N_Op_Ge
=> Op
:= N_Op_Lt
;
3204 when others => raise Program_Error
;
3208 -- Case of entity op value
3210 if Is_Entity_Name
(Left_Opnd
(Cond
))
3211 and then Ent
= Entity
(Left_Opnd
(Cond
))
3212 and then Compile_Time_Known_Value
(Right_Opnd
(Cond
))
3214 Val
:= Right_Opnd
(Cond
);
3216 -- Case of value op entity
3218 elsif Is_Entity_Name
(Right_Opnd
(Cond
))
3219 and then Ent
= Entity
(Right_Opnd
(Cond
))
3220 and then Compile_Time_Known_Value
(Left_Opnd
(Cond
))
3222 Val
:= Left_Opnd
(Cond
);
3224 -- We are effectively swapping operands
3227 when N_Op_Eq
=> null;
3228 when N_Op_Ne
=> null;
3229 when N_Op_Lt
=> Op
:= N_Op_Gt
;
3230 when N_Op_Gt
=> Op
:= N_Op_Lt
;
3231 when N_Op_Le
=> Op
:= N_Op_Ge
;
3232 when N_Op_Ge
=> Op
:= N_Op_Le
;
3233 when others => raise Program_Error
;
3242 elsif Nkind_In
(Cond
,
3244 N_Qualified_Expression
,
3245 N_Expression_With_Actions
)
3247 Cond
:= Expression
(Cond
);
3249 -- Case of Boolean variable reference, return as though the
3250 -- reference had said var = True.
3253 if Is_Entity_Name
(Cond
) and then Ent
= Entity
(Cond
) then
3254 Val
:= New_Occurrence_Of
(Standard_True
, Sloc
(Cond
));
3256 if Sens
= False then
3263 end Process_Current_Value_Condition
;
3265 -- Start of processing for Get_Current_Value_Condition
3271 -- Immediate return, nothing doing, if this is not an object
3273 if Ekind
(Ent
) not in Object_Kind
then
3277 -- Otherwise examine current value
3280 CV
: constant Node_Id
:= Current_Value
(Ent
);
3285 -- If statement. Condition is known true in THEN section, known False
3286 -- in any ELSIF or ELSE part, and unknown outside the IF statement.
3288 if Nkind
(CV
) = N_If_Statement
then
3290 -- Before start of IF statement
3292 if Loc
< Sloc
(CV
) then
3295 -- After end of IF statement
3297 elsif Loc
>= Sloc
(CV
) + Text_Ptr
(UI_To_Int
(End_Span
(CV
))) then
3301 -- At this stage we know that we are within the IF statement, but
3302 -- unfortunately, the tree does not record the SLOC of the ELSE so
3303 -- we cannot use a simple SLOC comparison to distinguish between
3304 -- the then/else statements, so we have to climb the tree.
3311 while Parent
(N
) /= CV
loop
3314 -- If we fall off the top of the tree, then that's odd, but
3315 -- perhaps it could occur in some error situation, and the
3316 -- safest response is simply to assume that the outcome of
3317 -- the condition is unknown. No point in bombing during an
3318 -- attempt to optimize things.
3325 -- Now we have N pointing to a node whose parent is the IF
3326 -- statement in question, so now we can tell if we are within
3327 -- the THEN statements.
3329 if Is_List_Member
(N
)
3330 and then List_Containing
(N
) = Then_Statements
(CV
)
3334 -- If the variable reference does not come from source, we
3335 -- cannot reliably tell whether it appears in the else part.
3336 -- In particular, if it appears in generated code for a node
3337 -- that requires finalization, it may be attached to a list
3338 -- that has not been yet inserted into the code. For now,
3339 -- treat it as unknown.
3341 elsif not Comes_From_Source
(N
) then
3344 -- Otherwise we must be in ELSIF or ELSE part
3351 -- ELSIF part. Condition is known true within the referenced
3352 -- ELSIF, known False in any subsequent ELSIF or ELSE part,
3353 -- and unknown before the ELSE part or after the IF statement.
3355 elsif Nkind
(CV
) = N_Elsif_Part
then
3357 -- if the Elsif_Part had condition_actions, the elsif has been
3358 -- rewritten as a nested if, and the original elsif_part is
3359 -- detached from the tree, so there is no way to obtain useful
3360 -- information on the current value of the variable.
3361 -- Can this be improved ???
3363 if No
(Parent
(CV
)) then
3369 -- Before start of ELSIF part
3371 if Loc
< Sloc
(CV
) then
3374 -- After end of IF statement
3376 elsif Loc
>= Sloc
(Stm
) +
3377 Text_Ptr
(UI_To_Int
(End_Span
(Stm
)))
3382 -- Again we lack the SLOC of the ELSE, so we need to climb the
3383 -- tree to see if we are within the ELSIF part in question.
3390 while Parent
(N
) /= Stm
loop
3393 -- If we fall off the top of the tree, then that's odd, but
3394 -- perhaps it could occur in some error situation, and the
3395 -- safest response is simply to assume that the outcome of
3396 -- the condition is unknown. No point in bombing during an
3397 -- attempt to optimize things.
3404 -- Now we have N pointing to a node whose parent is the IF
3405 -- statement in question, so see if is the ELSIF part we want.
3406 -- the THEN statements.
3411 -- Otherwise we must be in subsequent ELSIF or ELSE part
3418 -- Iteration scheme of while loop. The condition is known to be
3419 -- true within the body of the loop.
3421 elsif Nkind
(CV
) = N_Iteration_Scheme
then
3423 Loop_Stmt
: constant Node_Id
:= Parent
(CV
);
3426 -- Before start of body of loop
3428 if Loc
< Sloc
(Loop_Stmt
) then
3431 -- After end of LOOP statement
3433 elsif Loc
>= Sloc
(End_Label
(Loop_Stmt
)) then
3436 -- We are within the body of the loop
3443 -- All other cases of Current_Value settings
3449 -- If we fall through here, then we have a reportable condition, Sens
3450 -- is True if the condition is true and False if it needs inverting.
3452 Process_Current_Value_Condition
(Condition
(CV
), Sens
);
3454 end Get_Current_Value_Condition
;
3456 ---------------------
3457 -- Get_Stream_Size --
3458 ---------------------
3460 function Get_Stream_Size
(E
: Entity_Id
) return Uint
is
3462 -- If we have a Stream_Size clause for this type use it
3464 if Has_Stream_Size_Clause
(E
) then
3465 return Static_Integer
(Expression
(Stream_Size_Clause
(E
)));
3467 -- Otherwise the Stream_Size if the size of the type
3472 end Get_Stream_Size
;
3474 ---------------------------
3475 -- Has_Access_Constraint --
3476 ---------------------------
3478 function Has_Access_Constraint
(E
: Entity_Id
) return Boolean is
3480 T
: constant Entity_Id
:= Etype
(E
);
3483 if Has_Per_Object_Constraint
(E
) and then Has_Discriminants
(T
) then
3484 Disc
:= First_Discriminant
(T
);
3485 while Present
(Disc
) loop
3486 if Is_Access_Type
(Etype
(Disc
)) then
3490 Next_Discriminant
(Disc
);
3497 end Has_Access_Constraint
;
3499 -----------------------------------------------------
3500 -- Has_Annotate_Pragma_For_External_Axiomatization --
3501 -----------------------------------------------------
3503 function Has_Annotate_Pragma_For_External_Axiomatization
3504 (E
: Entity_Id
) return Boolean
3506 function Is_Annotate_Pragma_For_External_Axiomatization
3507 (N
: Node_Id
) return Boolean;
3508 -- Returns whether N is
3509 -- pragma Annotate (GNATprove, External_Axiomatization);
3511 ----------------------------------------------------
3512 -- Is_Annotate_Pragma_For_External_Axiomatization --
3513 ----------------------------------------------------
3515 -- The general form of pragma Annotate is
3517 -- pragma Annotate (IDENTIFIER [, IDENTIFIER {, ARG}]);
3518 -- ARG ::= NAME | EXPRESSION
3520 -- The first two arguments are by convention intended to refer to an
3521 -- external tool and a tool-specific function. These arguments are
3524 -- The following is used to annotate a package specification which
3525 -- GNATprove should treat specially, because the axiomatization of
3526 -- this unit is given by the user instead of being automatically
3529 -- pragma Annotate (GNATprove, External_Axiomatization);
3531 function Is_Annotate_Pragma_For_External_Axiomatization
3532 (N
: Node_Id
) return Boolean
3534 Name_GNATprove
: constant String :=
3536 Name_External_Axiomatization
: constant String :=
3537 "external_axiomatization";
3541 if Nkind
(N
) = N_Pragma
3542 and then Get_Pragma_Id
(Pragma_Name
(N
)) = Pragma_Annotate
3543 and then List_Length
(Pragma_Argument_Associations
(N
)) = 2
3546 Arg1
: constant Node_Id
:=
3547 First
(Pragma_Argument_Associations
(N
));
3548 Arg2
: constant Node_Id
:= Next
(Arg1
);
3553 -- Fill in Name_Buffer with Name_GNATprove first, and then with
3554 -- Name_External_Axiomatization so that Name_Find returns the
3555 -- corresponding name. This takes care of all possible casings.
3558 Add_Str_To_Name_Buffer
(Name_GNATprove
);
3562 Add_Str_To_Name_Buffer
(Name_External_Axiomatization
);
3565 return Chars
(Get_Pragma_Arg
(Arg1
)) = Nam1
3567 Chars
(Get_Pragma_Arg
(Arg2
)) = Nam2
;
3573 end Is_Annotate_Pragma_For_External_Axiomatization
;
3578 Vis_Decls
: List_Id
;
3581 -- Start of processing for Has_Annotate_Pragma_For_External_Axiomatization
3584 if Nkind
(Parent
(E
)) = N_Defining_Program_Unit_Name
then
3585 Decl
:= Parent
(Parent
(E
));
3590 Vis_Decls
:= Visible_Declarations
(Decl
);
3592 N
:= First
(Vis_Decls
);
3593 while Present
(N
) loop
3595 -- Skip declarations generated by the frontend. Skip all pragmas
3596 -- that are not the desired Annotate pragma. Stop the search on
3597 -- the first non-pragma source declaration.
3599 if Comes_From_Source
(N
) then
3600 if Nkind
(N
) = N_Pragma
then
3601 if Is_Annotate_Pragma_For_External_Axiomatization
(N
) then
3613 end Has_Annotate_Pragma_For_External_Axiomatization
;
3615 --------------------
3616 -- Homonym_Number --
3617 --------------------
3619 function Homonym_Number
(Subp
: Entity_Id
) return Nat
is
3625 Hom
:= Homonym
(Subp
);
3626 while Present
(Hom
) loop
3627 if Scope
(Hom
) = Scope
(Subp
) then
3631 Hom
:= Homonym
(Hom
);
3637 -----------------------------------
3638 -- In_Library_Level_Package_Body --
3639 -----------------------------------
3641 function In_Library_Level_Package_Body
(Id
: Entity_Id
) return Boolean is
3643 -- First determine whether the entity appears at the library level, then
3644 -- look at the containing unit.
3646 if Is_Library_Level_Entity
(Id
) then
3648 Container
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Id
));
3651 return Nkind
(Unit
(Container
)) = N_Package_Body
;
3656 end In_Library_Level_Package_Body
;
3658 ------------------------------
3659 -- In_Unconditional_Context --
3660 ------------------------------
3662 function In_Unconditional_Context
(Node
: Node_Id
) return Boolean is
3667 while Present
(P
) loop
3669 when N_Subprogram_Body
=>
3672 when N_If_Statement
=>
3675 when N_Loop_Statement
=>
3678 when N_Case_Statement
=>
3687 end In_Unconditional_Context
;
3693 procedure Insert_Action
(Assoc_Node
: Node_Id
; Ins_Action
: Node_Id
) is
3695 if Present
(Ins_Action
) then
3696 Insert_Actions
(Assoc_Node
, New_List
(Ins_Action
));
3700 -- Version with check(s) suppressed
3702 procedure Insert_Action
3703 (Assoc_Node
: Node_Id
; Ins_Action
: Node_Id
; Suppress
: Check_Id
)
3706 Insert_Actions
(Assoc_Node
, New_List
(Ins_Action
), Suppress
);
3709 -------------------------
3710 -- Insert_Action_After --
3711 -------------------------
3713 procedure Insert_Action_After
3714 (Assoc_Node
: Node_Id
;
3715 Ins_Action
: Node_Id
)
3718 Insert_Actions_After
(Assoc_Node
, New_List
(Ins_Action
));
3719 end Insert_Action_After
;
3721 --------------------
3722 -- Insert_Actions --
3723 --------------------
3725 procedure Insert_Actions
(Assoc_Node
: Node_Id
; Ins_Actions
: List_Id
) is
3729 Wrapped_Node
: Node_Id
:= Empty
;
3732 if No
(Ins_Actions
) or else Is_Empty_List
(Ins_Actions
) then
3736 -- Ignore insert of actions from inside default expression (or other
3737 -- similar "spec expression") in the special spec-expression analyze
3738 -- mode. Any insertions at this point have no relevance, since we are
3739 -- only doing the analyze to freeze the types of any static expressions.
3740 -- See section "Handling of Default Expressions" in the spec of package
3741 -- Sem for further details.
3743 if In_Spec_Expression
then
3747 -- If the action derives from stuff inside a record, then the actions
3748 -- are attached to the current scope, to be inserted and analyzed on
3749 -- exit from the scope. The reason for this is that we may also be
3750 -- generating freeze actions at the same time, and they must eventually
3751 -- be elaborated in the correct order.
3753 if Is_Record_Type
(Current_Scope
)
3754 and then not Is_Frozen
(Current_Scope
)
3756 if No
(Scope_Stack
.Table
3757 (Scope_Stack
.Last
).Pending_Freeze_Actions
)
3759 Scope_Stack
.Table
(Scope_Stack
.Last
).Pending_Freeze_Actions
:=
3764 Scope_Stack
.Table
(Scope_Stack
.Last
).Pending_Freeze_Actions
);
3770 -- We now intend to climb up the tree to find the right point to
3771 -- insert the actions. We start at Assoc_Node, unless this node is a
3772 -- subexpression in which case we start with its parent. We do this for
3773 -- two reasons. First it speeds things up. Second, if Assoc_Node is
3774 -- itself one of the special nodes like N_And_Then, then we assume that
3775 -- an initial request to insert actions for such a node does not expect
3776 -- the actions to get deposited in the node for later handling when the
3777 -- node is expanded, since clearly the node is being dealt with by the
3778 -- caller. Note that in the subexpression case, N is always the child we
3781 -- N_Raise_xxx_Error is an annoying special case, it is a statement if
3782 -- it has type Standard_Void_Type, and a subexpression otherwise.
3783 -- otherwise. Procedure calls, and similarly procedure attribute
3784 -- references, are also statements.
3786 if Nkind
(Assoc_Node
) in N_Subexpr
3787 and then (Nkind
(Assoc_Node
) not in N_Raise_xxx_Error
3788 or else Etype
(Assoc_Node
) /= Standard_Void_Type
)
3789 and then Nkind
(Assoc_Node
) /= N_Procedure_Call_Statement
3790 and then (Nkind
(Assoc_Node
) /= N_Attribute_Reference
3791 or else not Is_Procedure_Attribute_Name
3792 (Attribute_Name
(Assoc_Node
)))
3795 P
:= Parent
(Assoc_Node
);
3797 -- Non-subexpression case. Note that N is initially Empty in this case
3798 -- (N is only guaranteed Non-Empty in the subexpr case).
3805 -- Capture root of the transient scope
3807 if Scope_Is_Transient
then
3808 Wrapped_Node
:= Node_To_Be_Wrapped
;
3812 pragma Assert
(Present
(P
));
3814 -- Make sure that inserted actions stay in the transient scope
3816 if Present
(Wrapped_Node
) and then N
= Wrapped_Node
then
3817 Store_Before_Actions_In_Scope
(Ins_Actions
);
3823 -- Case of right operand of AND THEN or OR ELSE. Put the actions
3824 -- in the Actions field of the right operand. They will be moved
3825 -- out further when the AND THEN or OR ELSE operator is expanded.
3826 -- Nothing special needs to be done for the left operand since
3827 -- in that case the actions are executed unconditionally.
3829 when N_Short_Circuit
=>
3830 if N
= Right_Opnd
(P
) then
3832 -- We are now going to either append the actions to the
3833 -- actions field of the short-circuit operation. We will
3834 -- also analyze the actions now.
3836 -- This analysis is really too early, the proper thing would
3837 -- be to just park them there now, and only analyze them if
3838 -- we find we really need them, and to it at the proper
3839 -- final insertion point. However attempting to this proved
3840 -- tricky, so for now we just kill current values before and
3841 -- after the analyze call to make sure we avoid peculiar
3842 -- optimizations from this out of order insertion.
3844 Kill_Current_Values
;
3846 -- If P has already been expanded, we can't park new actions
3847 -- on it, so we need to expand them immediately, introducing
3848 -- an Expression_With_Actions. N can't be an expression
3849 -- with actions, or else then the actions would have been
3850 -- inserted at an inner level.
3852 if Analyzed
(P
) then
3853 pragma Assert
(Nkind
(N
) /= N_Expression_With_Actions
);
3855 Make_Expression_With_Actions
(Sloc
(N
),
3856 Actions
=> Ins_Actions
,
3857 Expression
=> Relocate_Node
(N
)));
3858 Analyze_And_Resolve
(N
);
3860 elsif Present
(Actions
(P
)) then
3861 Insert_List_After_And_Analyze
3862 (Last
(Actions
(P
)), Ins_Actions
);
3864 Set_Actions
(P
, Ins_Actions
);
3865 Analyze_List
(Actions
(P
));
3868 Kill_Current_Values
;
3873 -- Then or Else dependent expression of an if expression. Add
3874 -- actions to Then_Actions or Else_Actions field as appropriate.
3875 -- The actions will be moved further out when the if is expanded.
3877 when N_If_Expression
=>
3879 ThenX
: constant Node_Id
:= Next
(First
(Expressions
(P
)));
3880 ElseX
: constant Node_Id
:= Next
(ThenX
);
3883 -- If the enclosing expression is already analyzed, as
3884 -- is the case for nested elaboration checks, insert the
3885 -- conditional further out.
3887 if Analyzed
(P
) then
3890 -- Actions belong to the then expression, temporarily place
3891 -- them as Then_Actions of the if expression. They will be
3892 -- moved to the proper place later when the if expression
3895 elsif N
= ThenX
then
3896 if Present
(Then_Actions
(P
)) then
3897 Insert_List_After_And_Analyze
3898 (Last
(Then_Actions
(P
)), Ins_Actions
);
3900 Set_Then_Actions
(P
, Ins_Actions
);
3901 Analyze_List
(Then_Actions
(P
));
3906 -- Actions belong to the else expression, temporarily place
3907 -- them as Else_Actions of the if expression. They will be
3908 -- moved to the proper place later when the if expression
3911 elsif N
= ElseX
then
3912 if Present
(Else_Actions
(P
)) then
3913 Insert_List_After_And_Analyze
3914 (Last
(Else_Actions
(P
)), Ins_Actions
);
3916 Set_Else_Actions
(P
, Ins_Actions
);
3917 Analyze_List
(Else_Actions
(P
));
3922 -- Actions belong to the condition. In this case they are
3923 -- unconditionally executed, and so we can continue the
3924 -- search for the proper insert point.
3931 -- Alternative of case expression, we place the action in the
3932 -- Actions field of the case expression alternative, this will
3933 -- be handled when the case expression is expanded.
3935 when N_Case_Expression_Alternative
=>
3936 if Present
(Actions
(P
)) then
3937 Insert_List_After_And_Analyze
3938 (Last
(Actions
(P
)), Ins_Actions
);
3940 Set_Actions
(P
, Ins_Actions
);
3941 Analyze_List
(Actions
(P
));
3946 -- Case of appearing within an Expressions_With_Actions node. When
3947 -- the new actions come from the expression of the expression with
3948 -- actions, they must be added to the existing actions. The other
3949 -- alternative is when the new actions are related to one of the
3950 -- existing actions of the expression with actions, and should
3951 -- never reach here: if actions are inserted on a statement
3952 -- within the Actions of an expression with actions, or on some
3953 -- sub-expression of such a statement, then the outermost proper
3954 -- insertion point is right before the statement, and we should
3955 -- never climb up as far as the N_Expression_With_Actions itself.
3957 when N_Expression_With_Actions
=>
3958 if N
= Expression
(P
) then
3959 if Is_Empty_List
(Actions
(P
)) then
3960 Append_List_To
(Actions
(P
), Ins_Actions
);
3961 Analyze_List
(Actions
(P
));
3963 Insert_List_After_And_Analyze
3964 (Last
(Actions
(P
)), Ins_Actions
);
3970 raise Program_Error
;
3973 -- Case of appearing in the condition of a while expression or
3974 -- elsif. We insert the actions into the Condition_Actions field.
3975 -- They will be moved further out when the while loop or elsif
3978 when N_Iteration_Scheme |
3981 if N
= Condition
(P
) then
3982 if Present
(Condition_Actions
(P
)) then
3983 Insert_List_After_And_Analyze
3984 (Last
(Condition_Actions
(P
)), Ins_Actions
);
3986 Set_Condition_Actions
(P
, Ins_Actions
);
3988 -- Set the parent of the insert actions explicitly. This
3989 -- is not a syntactic field, but we need the parent field
3990 -- set, in particular so that freeze can understand that
3991 -- it is dealing with condition actions, and properly
3992 -- insert the freezing actions.
3994 Set_Parent
(Ins_Actions
, P
);
3995 Analyze_List
(Condition_Actions
(P
));
4001 -- Statements, declarations, pragmas, representation clauses
4006 N_Procedure_Call_Statement |
4007 N_Statement_Other_Than_Procedure_Call |
4013 -- Representation_Clause
4016 N_Attribute_Definition_Clause |
4017 N_Enumeration_Representation_Clause |
4018 N_Record_Representation_Clause |
4022 N_Abstract_Subprogram_Declaration |
4024 N_Exception_Declaration |
4025 N_Exception_Renaming_Declaration |
4026 N_Expression_Function |
4027 N_Formal_Abstract_Subprogram_Declaration |
4028 N_Formal_Concrete_Subprogram_Declaration |
4029 N_Formal_Object_Declaration |
4030 N_Formal_Type_Declaration |
4031 N_Full_Type_Declaration |
4032 N_Function_Instantiation |
4033 N_Generic_Function_Renaming_Declaration |
4034 N_Generic_Package_Declaration |
4035 N_Generic_Package_Renaming_Declaration |
4036 N_Generic_Procedure_Renaming_Declaration |
4037 N_Generic_Subprogram_Declaration |
4038 N_Implicit_Label_Declaration |
4039 N_Incomplete_Type_Declaration |
4040 N_Number_Declaration |
4041 N_Object_Declaration |
4042 N_Object_Renaming_Declaration |
4044 N_Package_Body_Stub |
4045 N_Package_Declaration |
4046 N_Package_Instantiation |
4047 N_Package_Renaming_Declaration |
4048 N_Private_Extension_Declaration |
4049 N_Private_Type_Declaration |
4050 N_Procedure_Instantiation |
4052 N_Protected_Body_Stub |
4053 N_Protected_Type_Declaration |
4054 N_Single_Task_Declaration |
4056 N_Subprogram_Body_Stub |
4057 N_Subprogram_Declaration |
4058 N_Subprogram_Renaming_Declaration |
4059 N_Subtype_Declaration |
4062 N_Task_Type_Declaration |
4064 -- Use clauses can appear in lists of declarations
4066 N_Use_Package_Clause |
4069 -- Freeze entity behaves like a declaration or statement
4072 N_Freeze_Generic_Entity
4074 -- Do not insert here if the item is not a list member (this
4075 -- happens for example with a triggering statement, and the
4076 -- proper approach is to insert before the entire select).
4078 if not Is_List_Member
(P
) then
4081 -- Do not insert if parent of P is an N_Component_Association
4082 -- node (i.e. we are in the context of an N_Aggregate or
4083 -- N_Extension_Aggregate node. In this case we want to insert
4084 -- before the entire aggregate.
4086 elsif Nkind
(Parent
(P
)) = N_Component_Association
then
4089 -- Do not insert if the parent of P is either an N_Variant node
4090 -- or an N_Record_Definition node, meaning in either case that
4091 -- P is a member of a component list, and that therefore the
4092 -- actions should be inserted outside the complete record
4095 elsif Nkind_In
(Parent
(P
), N_Variant
, N_Record_Definition
) then
4098 -- Do not insert freeze nodes within the loop generated for
4099 -- an aggregate, because they may be elaborated too late for
4100 -- subsequent use in the back end: within a package spec the
4101 -- loop is part of the elaboration procedure and is only
4102 -- elaborated during the second pass.
4104 -- If the loop comes from source, or the entity is local to the
4105 -- loop itself it must remain within.
4107 elsif Nkind
(Parent
(P
)) = N_Loop_Statement
4108 and then not Comes_From_Source
(Parent
(P
))
4109 and then Nkind
(First
(Ins_Actions
)) = N_Freeze_Entity
4111 Scope
(Entity
(First
(Ins_Actions
))) /= Current_Scope
4115 -- Otherwise we can go ahead and do the insertion
4117 elsif P
= Wrapped_Node
then
4118 Store_Before_Actions_In_Scope
(Ins_Actions
);
4122 Insert_List_Before_And_Analyze
(P
, Ins_Actions
);
4126 -- A special case, N_Raise_xxx_Error can act either as a statement
4127 -- or a subexpression. We tell the difference by looking at the
4128 -- Etype. It is set to Standard_Void_Type in the statement case.
4131 N_Raise_xxx_Error
=>
4132 if Etype
(P
) = Standard_Void_Type
then
4133 if P
= Wrapped_Node
then
4134 Store_Before_Actions_In_Scope
(Ins_Actions
);
4136 Insert_List_Before_And_Analyze
(P
, Ins_Actions
);
4141 -- In the subexpression case, keep climbing
4147 -- If a component association appears within a loop created for
4148 -- an array aggregate, attach the actions to the association so
4149 -- they can be subsequently inserted within the loop. For other
4150 -- component associations insert outside of the aggregate. For
4151 -- an association that will generate a loop, its Loop_Actions
4152 -- attribute is already initialized (see exp_aggr.adb).
4154 -- The list of loop_actions can in turn generate additional ones,
4155 -- that are inserted before the associated node. If the associated
4156 -- node is outside the aggregate, the new actions are collected
4157 -- at the end of the loop actions, to respect the order in which
4158 -- they are to be elaborated.
4161 N_Component_Association
=>
4162 if Nkind
(Parent
(P
)) = N_Aggregate
4163 and then Present
(Loop_Actions
(P
))
4165 if Is_Empty_List
(Loop_Actions
(P
)) then
4166 Set_Loop_Actions
(P
, Ins_Actions
);
4167 Analyze_List
(Ins_Actions
);
4174 -- Check whether these actions were generated by a
4175 -- declaration that is part of the loop_ actions
4176 -- for the component_association.
4179 while Present
(Decl
) loop
4180 exit when Parent
(Decl
) = P
4181 and then Is_List_Member
(Decl
)
4183 List_Containing
(Decl
) = Loop_Actions
(P
);
4184 Decl
:= Parent
(Decl
);
4187 if Present
(Decl
) then
4188 Insert_List_Before_And_Analyze
4189 (Decl
, Ins_Actions
);
4191 Insert_List_After_And_Analyze
4192 (Last
(Loop_Actions
(P
)), Ins_Actions
);
4203 -- Another special case, an attribute denoting a procedure call
4206 N_Attribute_Reference
=>
4207 if Is_Procedure_Attribute_Name
(Attribute_Name
(P
)) then
4208 if P
= Wrapped_Node
then
4209 Store_Before_Actions_In_Scope
(Ins_Actions
);
4211 Insert_List_Before_And_Analyze
(P
, Ins_Actions
);
4216 -- In the subexpression case, keep climbing
4222 -- A contract node should not belong to the tree
4225 raise Program_Error
;
4227 -- For all other node types, keep climbing tree
4231 N_Accept_Alternative |
4232 N_Access_Definition |
4233 N_Access_Function_Definition |
4234 N_Access_Procedure_Definition |
4235 N_Access_To_Object_Definition |
4238 N_Aspect_Specification |
4240 N_Case_Statement_Alternative |
4241 N_Character_Literal |
4242 N_Compilation_Unit |
4243 N_Compilation_Unit_Aux |
4244 N_Component_Clause |
4245 N_Component_Declaration |
4246 N_Component_Definition |
4248 N_Constrained_Array_Definition |
4249 N_Decimal_Fixed_Point_Definition |
4250 N_Defining_Character_Literal |
4251 N_Defining_Identifier |
4252 N_Defining_Operator_Symbol |
4253 N_Defining_Program_Unit_Name |
4254 N_Delay_Alternative |
4255 N_Delta_Constraint |
4256 N_Derived_Type_Definition |
4258 N_Digits_Constraint |
4259 N_Discriminant_Association |
4260 N_Discriminant_Specification |
4262 N_Entry_Body_Formal_Part |
4263 N_Entry_Call_Alternative |
4264 N_Entry_Declaration |
4265 N_Entry_Index_Specification |
4266 N_Enumeration_Type_Definition |
4268 N_Exception_Handler |
4270 N_Explicit_Dereference |
4271 N_Extension_Aggregate |
4272 N_Floating_Point_Definition |
4273 N_Formal_Decimal_Fixed_Point_Definition |
4274 N_Formal_Derived_Type_Definition |
4275 N_Formal_Discrete_Type_Definition |
4276 N_Formal_Floating_Point_Definition |
4277 N_Formal_Modular_Type_Definition |
4278 N_Formal_Ordinary_Fixed_Point_Definition |
4279 N_Formal_Package_Declaration |
4280 N_Formal_Private_Type_Definition |
4281 N_Formal_Incomplete_Type_Definition |
4282 N_Formal_Signed_Integer_Type_Definition |
4284 N_Function_Specification |
4285 N_Generic_Association |
4286 N_Handled_Sequence_Of_Statements |
4289 N_Index_Or_Discriminant_Constraint |
4290 N_Indexed_Component |
4292 N_Iterator_Specification |
4295 N_Loop_Parameter_Specification |
4297 N_Modular_Type_Definition |
4323 N_Op_Shift_Right_Arithmetic |
4327 N_Ordinary_Fixed_Point_Definition |
4329 N_Package_Specification |
4330 N_Parameter_Association |
4331 N_Parameter_Specification |
4332 N_Pop_Constraint_Error_Label |
4333 N_Pop_Program_Error_Label |
4334 N_Pop_Storage_Error_Label |
4335 N_Pragma_Argument_Association |
4336 N_Procedure_Specification |
4337 N_Protected_Definition |
4338 N_Push_Constraint_Error_Label |
4339 N_Push_Program_Error_Label |
4340 N_Push_Storage_Error_Label |
4341 N_Qualified_Expression |
4342 N_Quantified_Expression |
4343 N_Raise_Expression |
4345 N_Range_Constraint |
4347 N_Real_Range_Specification |
4348 N_Record_Definition |
4350 N_SCIL_Dispatch_Table_Tag_Init |
4351 N_SCIL_Dispatching_Call |
4352 N_SCIL_Membership_Test |
4353 N_Selected_Component |
4354 N_Signed_Integer_Type_Definition |
4355 N_Single_Protected_Declaration |
4358 N_Subtype_Indication |
4361 N_Terminate_Alternative |
4362 N_Triggering_Alternative |
4364 N_Unchecked_Expression |
4365 N_Unchecked_Type_Conversion |
4366 N_Unconstrained_Array_Definition |
4371 N_Validate_Unchecked_Conversion |
4378 -- If we fall through above tests, keep climbing tree
4382 if Nkind
(Parent
(N
)) = N_Subunit
then
4384 -- This is the proper body corresponding to a stub. Insertion must
4385 -- be done at the point of the stub, which is in the declarative
4386 -- part of the parent unit.
4388 P
:= Corresponding_Stub
(Parent
(N
));
4396 -- Version with check(s) suppressed
4398 procedure Insert_Actions
4399 (Assoc_Node
: Node_Id
;
4400 Ins_Actions
: List_Id
;
4401 Suppress
: Check_Id
)
4404 if Suppress
= All_Checks
then
4406 Sva
: constant Suppress_Array
:= Scope_Suppress
.Suppress
;
4408 Scope_Suppress
.Suppress
:= (others => True);
4409 Insert_Actions
(Assoc_Node
, Ins_Actions
);
4410 Scope_Suppress
.Suppress
:= Sva
;
4415 Svg
: constant Boolean := Scope_Suppress
.Suppress
(Suppress
);
4417 Scope_Suppress
.Suppress
(Suppress
) := True;
4418 Insert_Actions
(Assoc_Node
, Ins_Actions
);
4419 Scope_Suppress
.Suppress
(Suppress
) := Svg
;
4424 --------------------------
4425 -- Insert_Actions_After --
4426 --------------------------
4428 procedure Insert_Actions_After
4429 (Assoc_Node
: Node_Id
;
4430 Ins_Actions
: List_Id
)
4433 if Scope_Is_Transient
and then Assoc_Node
= Node_To_Be_Wrapped
then
4434 Store_After_Actions_In_Scope
(Ins_Actions
);
4436 Insert_List_After_And_Analyze
(Assoc_Node
, Ins_Actions
);
4438 end Insert_Actions_After
;
4440 ------------------------
4441 -- Insert_Declaration --
4442 ------------------------
4444 procedure Insert_Declaration
(N
: Node_Id
; Decl
: Node_Id
) is
4448 pragma Assert
(Nkind
(N
) in N_Subexpr
);
4450 -- Climb until we find a procedure or a package
4454 pragma Assert
(Present
(Parent
(P
)));
4457 if Is_List_Member
(P
) then
4458 exit when Nkind_In
(Parent
(P
), N_Package_Specification
,
4461 -- Special handling for handled sequence of statements, we must
4462 -- insert in the statements not the exception handlers!
4464 if Nkind
(Parent
(P
)) = N_Handled_Sequence_Of_Statements
then
4465 P
:= First
(Statements
(Parent
(P
)));
4471 -- Now do the insertion
4473 Insert_Before
(P
, Decl
);
4475 end Insert_Declaration
;
4477 ---------------------------------
4478 -- Insert_Library_Level_Action --
4479 ---------------------------------
4481 procedure Insert_Library_Level_Action
(N
: Node_Id
) is
4482 Aux
: constant Node_Id
:= Aux_Decls_Node
(Cunit
(Main_Unit
));
4485 Push_Scope
(Cunit_Entity
(Main_Unit
));
4486 -- ??? should this be Current_Sem_Unit instead of Main_Unit?
4488 if No
(Actions
(Aux
)) then
4489 Set_Actions
(Aux
, New_List
(N
));
4491 Append
(N
, Actions
(Aux
));
4496 end Insert_Library_Level_Action
;
4498 ----------------------------------
4499 -- Insert_Library_Level_Actions --
4500 ----------------------------------
4502 procedure Insert_Library_Level_Actions
(L
: List_Id
) is
4503 Aux
: constant Node_Id
:= Aux_Decls_Node
(Cunit
(Main_Unit
));
4506 if Is_Non_Empty_List
(L
) then
4507 Push_Scope
(Cunit_Entity
(Main_Unit
));
4508 -- ??? should this be Current_Sem_Unit instead of Main_Unit?
4510 if No
(Actions
(Aux
)) then
4511 Set_Actions
(Aux
, L
);
4514 Insert_List_After_And_Analyze
(Last
(Actions
(Aux
)), L
);
4519 end Insert_Library_Level_Actions
;
4521 ----------------------
4522 -- Inside_Init_Proc --
4523 ----------------------
4525 function Inside_Init_Proc
return Boolean is
4530 while Present
(S
) and then S
/= Standard_Standard
loop
4531 if Is_Init_Proc
(S
) then
4539 end Inside_Init_Proc
;
4541 ----------------------------
4542 -- Is_All_Null_Statements --
4543 ----------------------------
4545 function Is_All_Null_Statements
(L
: List_Id
) return Boolean is
4550 while Present
(Stm
) loop
4551 if Nkind
(Stm
) /= N_Null_Statement
then
4559 end Is_All_Null_Statements
;
4561 --------------------------------------------------
4562 -- Is_Displacement_Of_Object_Or_Function_Result --
4563 --------------------------------------------------
4565 function Is_Displacement_Of_Object_Or_Function_Result
4566 (Obj_Id
: Entity_Id
) return Boolean
4568 function Is_Controlled_Function_Call
(N
: Node_Id
) return Boolean;
4569 -- Determine if particular node denotes a controlled function call. The
4570 -- call may have been heavily expanded.
4572 function Is_Displace_Call
(N
: Node_Id
) return Boolean;
4573 -- Determine whether a particular node is a call to Ada.Tags.Displace.
4574 -- The call might be nested within other actions such as conversions.
4576 function Is_Source_Object
(N
: Node_Id
) return Boolean;
4577 -- Determine whether a particular node denotes a source object
4579 ---------------------------------
4580 -- Is_Controlled_Function_Call --
4581 ---------------------------------
4583 function Is_Controlled_Function_Call
(N
: Node_Id
) return Boolean is
4584 Expr
: Node_Id
:= Original_Node
(N
);
4587 if Nkind
(Expr
) = N_Function_Call
then
4588 Expr
:= Name
(Expr
);
4590 -- When a function call appears in Object.Operation format, the
4591 -- original representation has two possible forms depending on the
4592 -- availability of actual parameters:
4594 -- Obj.Func_Call N_Selected_Component
4595 -- Obj.Func_Call (Param) N_Indexed_Component
4598 if Nkind
(Expr
) = N_Indexed_Component
then
4599 Expr
:= Prefix
(Expr
);
4602 if Nkind
(Expr
) = N_Selected_Component
then
4603 Expr
:= Selector_Name
(Expr
);
4608 Nkind_In
(Expr
, N_Expanded_Name
, N_Identifier
)
4609 and then Ekind
(Entity
(Expr
)) = E_Function
4610 and then Needs_Finalization
(Etype
(Entity
(Expr
)));
4611 end Is_Controlled_Function_Call
;
4613 ----------------------
4614 -- Is_Displace_Call --
4615 ----------------------
4617 function Is_Displace_Call
(N
: Node_Id
) return Boolean is
4618 Call
: Node_Id
:= N
;
4621 -- Strip various actions which may precede a call to Displace
4624 if Nkind
(Call
) = N_Explicit_Dereference
then
4625 Call
:= Prefix
(Call
);
4627 elsif Nkind_In
(Call
, N_Type_Conversion
,
4628 N_Unchecked_Type_Conversion
)
4630 Call
:= Expression
(Call
);
4639 and then Nkind
(Call
) = N_Function_Call
4640 and then Is_RTE
(Entity
(Name
(Call
)), RE_Displace
);
4641 end Is_Displace_Call
;
4643 ----------------------
4644 -- Is_Source_Object --
4645 ----------------------
4647 function Is_Source_Object
(N
: Node_Id
) return Boolean is
4651 and then Nkind
(N
) in N_Has_Entity
4652 and then Is_Object
(Entity
(N
))
4653 and then Comes_From_Source
(N
);
4654 end Is_Source_Object
;
4658 Decl
: constant Node_Id
:= Parent
(Obj_Id
);
4659 Obj_Typ
: constant Entity_Id
:= Base_Type
(Etype
(Obj_Id
));
4660 Orig_Decl
: constant Node_Id
:= Original_Node
(Decl
);
4662 -- Start of processing for Is_Displacement_Of_Object_Or_Function_Result
4667 -- Obj : CW_Type := Function_Call (...);
4671 -- Tmp : ... := Function_Call (...)'reference;
4672 -- Obj : CW_Type renames (... Ada.Tags.Displace (Tmp));
4674 -- where the return type of the function and the class-wide type require
4675 -- dispatch table pointer displacement.
4679 -- Obj : CW_Type := Src_Obj;
4683 -- Obj : CW_Type renames (... Ada.Tags.Displace (Src_Obj));
4685 -- where the type of the source object and the class-wide type require
4686 -- dispatch table pointer displacement.
4689 Nkind
(Decl
) = N_Object_Renaming_Declaration
4690 and then Nkind
(Orig_Decl
) = N_Object_Declaration
4691 and then Comes_From_Source
(Orig_Decl
)
4692 and then Is_Class_Wide_Type
(Obj_Typ
)
4693 and then Is_Displace_Call
(Renamed_Object
(Obj_Id
))
4695 (Is_Controlled_Function_Call
(Expression
(Orig_Decl
))
4696 or else Is_Source_Object
(Expression
(Orig_Decl
)));
4697 end Is_Displacement_Of_Object_Or_Function_Result
;
4699 ------------------------------
4700 -- Is_Finalizable_Transient --
4701 ------------------------------
4703 function Is_Finalizable_Transient
4705 Rel_Node
: Node_Id
) return Boolean
4707 Obj_Id
: constant Entity_Id
:= Defining_Identifier
(Decl
);
4708 Obj_Typ
: constant Entity_Id
:= Base_Type
(Etype
(Obj_Id
));
4709 Desig
: Entity_Id
:= Obj_Typ
;
4711 function Initialized_By_Access
(Trans_Id
: Entity_Id
) return Boolean;
4712 -- Determine whether transient object Trans_Id is initialized either
4713 -- by a function call which returns an access type or simply renames
4716 function Initialized_By_Aliased_BIP_Func_Call
4717 (Trans_Id
: Entity_Id
) return Boolean;
4718 -- Determine whether transient object Trans_Id is initialized by a
4719 -- build-in-place function call where the BIPalloc parameter is of
4720 -- value 1 and BIPaccess is not null. This case creates an aliasing
4721 -- between the returned value and the value denoted by BIPaccess.
4724 (Trans_Id
: Entity_Id
;
4725 First_Stmt
: Node_Id
) return Boolean;
4726 -- Determine whether transient object Trans_Id has been renamed or
4727 -- aliased through 'reference in the statement list starting from
4730 function Is_Allocated
(Trans_Id
: Entity_Id
) return Boolean;
4731 -- Determine whether transient object Trans_Id is allocated on the heap
4733 function Is_Iterated_Container
4734 (Trans_Id
: Entity_Id
;
4735 First_Stmt
: Node_Id
) return Boolean;
4736 -- Determine whether transient object Trans_Id denotes a container which
4737 -- is in the process of being iterated in the statement list starting
4740 ---------------------------
4741 -- Initialized_By_Access --
4742 ---------------------------
4744 function Initialized_By_Access
(Trans_Id
: Entity_Id
) return Boolean is
4745 Expr
: constant Node_Id
:= Expression
(Parent
(Trans_Id
));
4750 and then Nkind
(Expr
) /= N_Reference
4751 and then Is_Access_Type
(Etype
(Expr
));
4752 end Initialized_By_Access
;
4754 ------------------------------------------
4755 -- Initialized_By_Aliased_BIP_Func_Call --
4756 ------------------------------------------
4758 function Initialized_By_Aliased_BIP_Func_Call
4759 (Trans_Id
: Entity_Id
) return Boolean
4761 Call
: Node_Id
:= Expression
(Parent
(Trans_Id
));
4764 -- Build-in-place calls usually appear in 'reference format
4766 if Nkind
(Call
) = N_Reference
then
4767 Call
:= Prefix
(Call
);
4770 if Is_Build_In_Place_Function_Call
(Call
) then
4772 Access_Nam
: Name_Id
:= No_Name
;
4773 Access_OK
: Boolean := False;
4775 Alloc_Nam
: Name_Id
:= No_Name
;
4776 Alloc_OK
: Boolean := False;
4778 Func_Id
: Entity_Id
;
4782 -- Examine all parameter associations of the function call
4784 Param
:= First
(Parameter_Associations
(Call
));
4785 while Present
(Param
) loop
4786 if Nkind
(Param
) = N_Parameter_Association
4787 and then Nkind
(Selector_Name
(Param
)) = N_Identifier
4789 Actual
:= Explicit_Actual_Parameter
(Param
);
4790 Formal
:= Selector_Name
(Param
);
4792 -- Construct the names of formals BIPaccess and BIPalloc
4793 -- using the function name retrieved from an arbitrary
4796 if Access_Nam
= No_Name
4797 and then Alloc_Nam
= No_Name
4798 and then Present
(Entity
(Formal
))
4800 Func_Id
:= Scope
(Entity
(Formal
));
4803 New_External_Name
(Chars
(Func_Id
),
4804 BIP_Formal_Suffix
(BIP_Object_Access
));
4807 New_External_Name
(Chars
(Func_Id
),
4808 BIP_Formal_Suffix
(BIP_Alloc_Form
));
4811 -- A match for BIPaccess => Temp has been found
4813 if Chars
(Formal
) = Access_Nam
4814 and then Nkind
(Actual
) /= N_Null
4819 -- A match for BIPalloc => 1 has been found
4821 if Chars
(Formal
) = Alloc_Nam
4822 and then Nkind
(Actual
) = N_Integer_Literal
4823 and then Intval
(Actual
) = Uint_1
4832 return Access_OK
and Alloc_OK
;
4837 end Initialized_By_Aliased_BIP_Func_Call
;
4844 (Trans_Id
: Entity_Id
;
4845 First_Stmt
: Node_Id
) return Boolean
4847 function Find_Renamed_Object
(Ren_Decl
: Node_Id
) return Entity_Id
;
4848 -- Given an object renaming declaration, retrieve the entity of the
4849 -- renamed name. Return Empty if the renamed name is anything other
4850 -- than a variable or a constant.
4852 -------------------------
4853 -- Find_Renamed_Object --
4854 -------------------------
4856 function Find_Renamed_Object
(Ren_Decl
: Node_Id
) return Entity_Id
is
4857 Ren_Obj
: Node_Id
:= Empty
;
4859 function Find_Object
(N
: Node_Id
) return Traverse_Result
;
4860 -- Try to detect an object which is either a constant or a
4867 function Find_Object
(N
: Node_Id
) return Traverse_Result
is
4869 -- Stop the search once a constant or a variable has been
4872 if Nkind
(N
) = N_Identifier
4873 and then Present
(Entity
(N
))
4874 and then Ekind_In
(Entity
(N
), E_Constant
, E_Variable
)
4876 Ren_Obj
:= Entity
(N
);
4883 procedure Search
is new Traverse_Proc
(Find_Object
);
4887 Typ
: constant Entity_Id
:= Etype
(Defining_Identifier
(Ren_Decl
));
4889 -- Start of processing for Find_Renamed_Object
4892 -- Actions related to dispatching calls may appear as renamings of
4893 -- tags. Do not process this type of renaming because it does not
4894 -- use the actual value of the object.
4896 if not Is_RTE
(Typ
, RE_Tag_Ptr
) then
4897 Search
(Name
(Ren_Decl
));
4901 end Find_Renamed_Object
;
4906 Ren_Obj
: Entity_Id
;
4909 -- Start of processing for Is_Aliased
4913 while Present
(Stmt
) loop
4914 if Nkind
(Stmt
) = N_Object_Declaration
then
4915 Expr
:= Expression
(Stmt
);
4918 and then Nkind
(Expr
) = N_Reference
4919 and then Nkind
(Prefix
(Expr
)) = N_Identifier
4920 and then Entity
(Prefix
(Expr
)) = Trans_Id
4925 elsif Nkind
(Stmt
) = N_Object_Renaming_Declaration
then
4926 Ren_Obj
:= Find_Renamed_Object
(Stmt
);
4928 if Present
(Ren_Obj
) and then Ren_Obj
= Trans_Id
then
4943 function Is_Allocated
(Trans_Id
: Entity_Id
) return Boolean is
4944 Expr
: constant Node_Id
:= Expression
(Parent
(Trans_Id
));
4947 Is_Access_Type
(Etype
(Trans_Id
))
4948 and then Present
(Expr
)
4949 and then Nkind
(Expr
) = N_Allocator
;
4952 ---------------------------
4953 -- Is_Iterated_Container --
4954 ---------------------------
4956 function Is_Iterated_Container
4957 (Trans_Id
: Entity_Id
;
4958 First_Stmt
: Node_Id
) return Boolean
4968 -- It is not possible to iterate over containers in non-Ada 2012 code
4970 if Ada_Version
< Ada_2012
then
4974 Typ
:= Etype
(Trans_Id
);
4976 -- Handle access type created for secondary stack use
4978 if Is_Access_Type
(Typ
) then
4979 Typ
:= Designated_Type
(Typ
);
4982 -- Look for aspect Default_Iterator. It may be part of a type
4983 -- declaration for a container, or inherited from a base type
4986 Aspect
:= Find_Value_Of_Aspect
(Typ
, Aspect_Default_Iterator
);
4988 if Present
(Aspect
) then
4989 Iter
:= Entity
(Aspect
);
4991 -- Examine the statements following the container object and
4992 -- look for a call to the default iterate routine where the
4993 -- first parameter is the transient. Such a call appears as:
4995 -- It : Access_To_CW_Iterator :=
4996 -- Iterate (Tran_Id.all, ...)'reference;
4999 while Present
(Stmt
) loop
5001 -- Detect an object declaration which is initialized by a
5002 -- secondary stack function call.
5004 if Nkind
(Stmt
) = N_Object_Declaration
5005 and then Present
(Expression
(Stmt
))
5006 and then Nkind
(Expression
(Stmt
)) = N_Reference
5007 and then Nkind
(Prefix
(Expression
(Stmt
))) = N_Function_Call
5009 Call
:= Prefix
(Expression
(Stmt
));
5011 -- The call must invoke the default iterate routine of
5012 -- the container and the transient object must appear as
5013 -- the first actual parameter. Skip any calls whose names
5014 -- are not entities.
5016 if Is_Entity_Name
(Name
(Call
))
5017 and then Entity
(Name
(Call
)) = Iter
5018 and then Present
(Parameter_Associations
(Call
))
5020 Param
:= First
(Parameter_Associations
(Call
));
5022 if Nkind
(Param
) = N_Explicit_Dereference
5023 and then Entity
(Prefix
(Param
)) = Trans_Id
5035 end Is_Iterated_Container
;
5037 -- Start of processing for Is_Finalizable_Transient
5040 -- Handle access types
5042 if Is_Access_Type
(Desig
) then
5043 Desig
:= Available_View
(Designated_Type
(Desig
));
5047 Ekind_In
(Obj_Id
, E_Constant
, E_Variable
)
5048 and then Needs_Finalization
(Desig
)
5049 and then Requires_Transient_Scope
(Desig
)
5050 and then Nkind
(Rel_Node
) /= N_Simple_Return_Statement
5052 -- Do not consider renamed or 'reference-d transient objects because
5053 -- the act of renaming extends the object's lifetime.
5055 and then not Is_Aliased
(Obj_Id
, Decl
)
5057 -- Do not consider transient objects allocated on the heap since
5058 -- they are attached to a finalization master.
5060 and then not Is_Allocated
(Obj_Id
)
5062 -- If the transient object is a pointer, check that it is not
5063 -- initialized by a function which returns a pointer or acts as a
5064 -- renaming of another pointer.
5067 (not Is_Access_Type
(Obj_Typ
)
5068 or else not Initialized_By_Access
(Obj_Id
))
5070 -- Do not consider transient objects which act as indirect aliases
5071 -- of build-in-place function results.
5073 and then not Initialized_By_Aliased_BIP_Func_Call
(Obj_Id
)
5075 -- Do not consider conversions of tags to class-wide types
5077 and then not Is_Tag_To_Class_Wide_Conversion
(Obj_Id
)
5079 -- Do not consider containers in the context of iterator loops. Such
5080 -- transient objects must exist for as long as the loop is around,
5081 -- otherwise any operation carried out by the iterator will fail.
5083 and then not Is_Iterated_Container
(Obj_Id
, Decl
);
5084 end Is_Finalizable_Transient
;
5086 ---------------------------------
5087 -- Is_Fully_Repped_Tagged_Type --
5088 ---------------------------------
5090 function Is_Fully_Repped_Tagged_Type
(T
: Entity_Id
) return Boolean is
5091 U
: constant Entity_Id
:= Underlying_Type
(T
);
5095 if No
(U
) or else not Is_Tagged_Type
(U
) then
5097 elsif Has_Discriminants
(U
) then
5099 elsif not Has_Specified_Layout
(U
) then
5103 -- Here we have a tagged type, see if it has any unlayed out fields
5104 -- other than a possible tag and parent fields. If so, we return False.
5106 Comp
:= First_Component
(U
);
5107 while Present
(Comp
) loop
5108 if not Is_Tag
(Comp
)
5109 and then Chars
(Comp
) /= Name_uParent
5110 and then No
(Component_Clause
(Comp
))
5114 Next_Component
(Comp
);
5118 -- All components are layed out
5121 end Is_Fully_Repped_Tagged_Type
;
5123 ----------------------------------
5124 -- Is_Library_Level_Tagged_Type --
5125 ----------------------------------
5127 function Is_Library_Level_Tagged_Type
(Typ
: Entity_Id
) return Boolean is
5129 return Is_Tagged_Type
(Typ
) and then Is_Library_Level_Entity
(Typ
);
5130 end Is_Library_Level_Tagged_Type
;
5132 --------------------------
5133 -- Is_Non_BIP_Func_Call --
5134 --------------------------
5136 function Is_Non_BIP_Func_Call
(Expr
: Node_Id
) return Boolean is
5138 -- The expected call is of the format
5140 -- Func_Call'reference
5143 Nkind
(Expr
) = N_Reference
5144 and then Nkind
(Prefix
(Expr
)) = N_Function_Call
5145 and then not Is_Build_In_Place_Function_Call
(Prefix
(Expr
));
5146 end Is_Non_BIP_Func_Call
;
5148 ------------------------------------
5149 -- Is_Object_Access_BIP_Func_Call --
5150 ------------------------------------
5152 function Is_Object_Access_BIP_Func_Call
5154 Obj_Id
: Entity_Id
) return Boolean
5156 Access_Nam
: Name_Id
:= No_Name
;
5163 -- Build-in-place calls usually appear in 'reference format. Note that
5164 -- the accessibility check machinery may add an extra 'reference due to
5165 -- side effect removal.
5168 while Nkind
(Call
) = N_Reference
loop
5169 Call
:= Prefix
(Call
);
5172 if Nkind_In
(Call
, N_Qualified_Expression
,
5173 N_Unchecked_Type_Conversion
)
5175 Call
:= Expression
(Call
);
5178 if Is_Build_In_Place_Function_Call
(Call
) then
5180 -- Examine all parameter associations of the function call
5182 Param
:= First
(Parameter_Associations
(Call
));
5183 while Present
(Param
) loop
5184 if Nkind
(Param
) = N_Parameter_Association
5185 and then Nkind
(Selector_Name
(Param
)) = N_Identifier
5187 Formal
:= Selector_Name
(Param
);
5188 Actual
:= Explicit_Actual_Parameter
(Param
);
5190 -- Construct the name of formal BIPaccess. It is much easier to
5191 -- extract the name of the function using an arbitrary formal's
5192 -- scope rather than the Name field of Call.
5194 if Access_Nam
= No_Name
and then Present
(Entity
(Formal
)) then
5197 (Chars
(Scope
(Entity
(Formal
))),
5198 BIP_Formal_Suffix
(BIP_Object_Access
));
5201 -- A match for BIPaccess => Obj_Id'Unrestricted_Access has been
5204 if Chars
(Formal
) = Access_Nam
5205 and then Nkind
(Actual
) = N_Attribute_Reference
5206 and then Attribute_Name
(Actual
) = Name_Unrestricted_Access
5207 and then Nkind
(Prefix
(Actual
)) = N_Identifier
5208 and then Entity
(Prefix
(Actual
)) = Obj_Id
5219 end Is_Object_Access_BIP_Func_Call
;
5221 ----------------------------------
5222 -- Is_Possibly_Unaligned_Object --
5223 ----------------------------------
5225 function Is_Possibly_Unaligned_Object
(N
: Node_Id
) return Boolean is
5226 T
: constant Entity_Id
:= Etype
(N
);
5229 -- Objects are never unaligned on VMs
5231 if VM_Target
/= No_VM
then
5235 -- If renamed object, apply test to underlying object
5237 if Is_Entity_Name
(N
)
5238 and then Is_Object
(Entity
(N
))
5239 and then Present
(Renamed_Object
(Entity
(N
)))
5241 return Is_Possibly_Unaligned_Object
(Renamed_Object
(Entity
(N
)));
5244 -- Tagged and controlled types and aliased types are always aligned, as
5245 -- are concurrent types.
5248 or else Has_Controlled_Component
(T
)
5249 or else Is_Concurrent_Type
(T
)
5250 or else Is_Tagged_Type
(T
)
5251 or else Is_Controlled
(T
)
5256 -- If this is an element of a packed array, may be unaligned
5258 if Is_Ref_To_Bit_Packed_Array
(N
) then
5262 -- Case of indexed component reference: test whether prefix is unaligned
5264 if Nkind
(N
) = N_Indexed_Component
then
5265 return Is_Possibly_Unaligned_Object
(Prefix
(N
));
5267 -- Case of selected component reference
5269 elsif Nkind
(N
) = N_Selected_Component
then
5271 P
: constant Node_Id
:= Prefix
(N
);
5272 C
: constant Entity_Id
:= Entity
(Selector_Name
(N
));
5277 -- If component reference is for an array with non-static bounds,
5278 -- then it is always aligned: we can only process unaligned arrays
5279 -- with static bounds (more precisely compile time known bounds).
5281 if Is_Array_Type
(T
)
5282 and then not Compile_Time_Known_Bounds
(T
)
5287 -- If component is aliased, it is definitely properly aligned
5289 if Is_Aliased
(C
) then
5293 -- If component is for a type implemented as a scalar, and the
5294 -- record is packed, and the component is other than the first
5295 -- component of the record, then the component may be unaligned.
5297 if Is_Packed
(Etype
(P
))
5298 and then Represented_As_Scalar
(Etype
(C
))
5299 and then First_Entity
(Scope
(C
)) /= C
5304 -- Compute maximum possible alignment for T
5306 -- If alignment is known, then that settles things
5308 if Known_Alignment
(T
) then
5309 M
:= UI_To_Int
(Alignment
(T
));
5311 -- If alignment is not known, tentatively set max alignment
5314 M
:= Ttypes
.Maximum_Alignment
;
5316 -- We can reduce this if the Esize is known since the default
5317 -- alignment will never be more than the smallest power of 2
5318 -- that does not exceed this Esize value.
5320 if Known_Esize
(T
) then
5321 S
:= UI_To_Int
(Esize
(T
));
5323 while (M
/ 2) >= S
loop
5329 -- The following code is historical, it used to be present but it
5330 -- is too cautious, because the front-end does not know the proper
5331 -- default alignments for the target. Also, if the alignment is
5332 -- not known, the front end can't know in any case. If a copy is
5333 -- needed, the back-end will take care of it. This whole section
5334 -- including this comment can be removed later ???
5336 -- If the component reference is for a record that has a specified
5337 -- alignment, and we either know it is too small, or cannot tell,
5338 -- then the component may be unaligned.
5340 -- What is the following commented out code ???
5342 -- if Known_Alignment (Etype (P))
5343 -- and then Alignment (Etype (P)) < Ttypes.Maximum_Alignment
5344 -- and then M > Alignment (Etype (P))
5349 -- Case of component clause present which may specify an
5350 -- unaligned position.
5352 if Present
(Component_Clause
(C
)) then
5354 -- Otherwise we can do a test to make sure that the actual
5355 -- start position in the record, and the length, are both
5356 -- consistent with the required alignment. If not, we know
5357 -- that we are unaligned.
5360 Align_In_Bits
: constant Nat
:= M
* System_Storage_Unit
;
5362 if Component_Bit_Offset
(C
) mod Align_In_Bits
/= 0
5363 or else Esize
(C
) mod Align_In_Bits
/= 0
5370 -- Otherwise, for a component reference, test prefix
5372 return Is_Possibly_Unaligned_Object
(P
);
5375 -- If not a component reference, must be aligned
5380 end Is_Possibly_Unaligned_Object
;
5382 ---------------------------------
5383 -- Is_Possibly_Unaligned_Slice --
5384 ---------------------------------
5386 function Is_Possibly_Unaligned_Slice
(N
: Node_Id
) return Boolean is
5388 -- Go to renamed object
5390 if Is_Entity_Name
(N
)
5391 and then Is_Object
(Entity
(N
))
5392 and then Present
(Renamed_Object
(Entity
(N
)))
5394 return Is_Possibly_Unaligned_Slice
(Renamed_Object
(Entity
(N
)));
5397 -- The reference must be a slice
5399 if Nkind
(N
) /= N_Slice
then
5403 -- We only need to worry if the target has strict alignment
5405 if not Target_Strict_Alignment
then
5409 -- If it is a slice, then look at the array type being sliced
5412 Sarr
: constant Node_Id
:= Prefix
(N
);
5413 -- Prefix of the slice, i.e. the array being sliced
5415 Styp
: constant Entity_Id
:= Etype
(Prefix
(N
));
5416 -- Type of the array being sliced
5422 -- The problems arise if the array object that is being sliced
5423 -- is a component of a record or array, and we cannot guarantee
5424 -- the alignment of the array within its containing object.
5426 -- To investigate this, we look at successive prefixes to see
5427 -- if we have a worrisome indexed or selected component.
5431 -- Case of array is part of an indexed component reference
5433 if Nkind
(Pref
) = N_Indexed_Component
then
5434 Ptyp
:= Etype
(Prefix
(Pref
));
5436 -- The only problematic case is when the array is packed, in
5437 -- which case we really know nothing about the alignment of
5438 -- individual components.
5440 if Is_Bit_Packed_Array
(Ptyp
) then
5444 -- Case of array is part of a selected component reference
5446 elsif Nkind
(Pref
) = N_Selected_Component
then
5447 Ptyp
:= Etype
(Prefix
(Pref
));
5449 -- We are definitely in trouble if the record in question
5450 -- has an alignment, and either we know this alignment is
5451 -- inconsistent with the alignment of the slice, or we don't
5452 -- know what the alignment of the slice should be.
5454 if Known_Alignment
(Ptyp
)
5455 and then (Unknown_Alignment
(Styp
)
5456 or else Alignment
(Styp
) > Alignment
(Ptyp
))
5461 -- We are in potential trouble if the record type is packed.
5462 -- We could special case when we know that the array is the
5463 -- first component, but that's not such a simple case ???
5465 if Is_Packed
(Ptyp
) then
5469 -- We are in trouble if there is a component clause, and
5470 -- either we do not know the alignment of the slice, or
5471 -- the alignment of the slice is inconsistent with the
5472 -- bit position specified by the component clause.
5475 Field
: constant Entity_Id
:= Entity
(Selector_Name
(Pref
));
5477 if Present
(Component_Clause
(Field
))
5479 (Unknown_Alignment
(Styp
)
5481 (Component_Bit_Offset
(Field
) mod
5482 (System_Storage_Unit
* Alignment
(Styp
))) /= 0)
5488 -- For cases other than selected or indexed components we know we
5489 -- are OK, since no issues arise over alignment.
5495 -- We processed an indexed component or selected component
5496 -- reference that looked safe, so keep checking prefixes.
5498 Pref
:= Prefix
(Pref
);
5501 end Is_Possibly_Unaligned_Slice
;
5503 -------------------------------
5504 -- Is_Related_To_Func_Return --
5505 -------------------------------
5507 function Is_Related_To_Func_Return
(Id
: Entity_Id
) return Boolean is
5508 Expr
: constant Node_Id
:= Related_Expression
(Id
);
5512 and then Nkind
(Expr
) = N_Explicit_Dereference
5513 and then Nkind
(Parent
(Expr
)) = N_Simple_Return_Statement
;
5514 end Is_Related_To_Func_Return
;
5516 --------------------------------
5517 -- Is_Ref_To_Bit_Packed_Array --
5518 --------------------------------
5520 function Is_Ref_To_Bit_Packed_Array
(N
: Node_Id
) return Boolean is
5525 if Is_Entity_Name
(N
)
5526 and then Is_Object
(Entity
(N
))
5527 and then Present
(Renamed_Object
(Entity
(N
)))
5529 return Is_Ref_To_Bit_Packed_Array
(Renamed_Object
(Entity
(N
)));
5532 if Nkind_In
(N
, N_Indexed_Component
, N_Selected_Component
) then
5533 if Is_Bit_Packed_Array
(Etype
(Prefix
(N
))) then
5536 Result
:= Is_Ref_To_Bit_Packed_Array
(Prefix
(N
));
5539 if Result
and then Nkind
(N
) = N_Indexed_Component
then
5540 Expr
:= First
(Expressions
(N
));
5541 while Present
(Expr
) loop
5542 Force_Evaluation
(Expr
);
5552 end Is_Ref_To_Bit_Packed_Array
;
5554 --------------------------------
5555 -- Is_Ref_To_Bit_Packed_Slice --
5556 --------------------------------
5558 function Is_Ref_To_Bit_Packed_Slice
(N
: Node_Id
) return Boolean is
5560 if Nkind
(N
) = N_Type_Conversion
then
5561 return Is_Ref_To_Bit_Packed_Slice
(Expression
(N
));
5563 elsif Is_Entity_Name
(N
)
5564 and then Is_Object
(Entity
(N
))
5565 and then Present
(Renamed_Object
(Entity
(N
)))
5567 return Is_Ref_To_Bit_Packed_Slice
(Renamed_Object
(Entity
(N
)));
5569 elsif Nkind
(N
) = N_Slice
5570 and then Is_Bit_Packed_Array
(Etype
(Prefix
(N
)))
5574 elsif Nkind_In
(N
, N_Indexed_Component
, N_Selected_Component
) then
5575 return Is_Ref_To_Bit_Packed_Slice
(Prefix
(N
));
5580 end Is_Ref_To_Bit_Packed_Slice
;
5582 -----------------------
5583 -- Is_Renamed_Object --
5584 -----------------------
5586 function Is_Renamed_Object
(N
: Node_Id
) return Boolean is
5587 Pnod
: constant Node_Id
:= Parent
(N
);
5588 Kind
: constant Node_Kind
:= Nkind
(Pnod
);
5590 if Kind
= N_Object_Renaming_Declaration
then
5592 elsif Nkind_In
(Kind
, N_Indexed_Component
, N_Selected_Component
) then
5593 return Is_Renamed_Object
(Pnod
);
5597 end Is_Renamed_Object
;
5599 --------------------------------------
5600 -- Is_Secondary_Stack_BIP_Func_Call --
5601 --------------------------------------
5603 function Is_Secondary_Stack_BIP_Func_Call
(Expr
: Node_Id
) return Boolean is
5604 Alloc_Nam
: Name_Id
:= No_Name
;
5606 Call
: Node_Id
:= Expr
;
5611 -- Build-in-place calls usually appear in 'reference format. Note that
5612 -- the accessibility check machinery may add an extra 'reference due to
5613 -- side effect removal.
5615 while Nkind
(Call
) = N_Reference
loop
5616 Call
:= Prefix
(Call
);
5619 if Nkind_In
(Call
, N_Qualified_Expression
,
5620 N_Unchecked_Type_Conversion
)
5622 Call
:= Expression
(Call
);
5625 if Is_Build_In_Place_Function_Call
(Call
) then
5627 -- Examine all parameter associations of the function call
5629 Param
:= First
(Parameter_Associations
(Call
));
5630 while Present
(Param
) loop
5631 if Nkind
(Param
) = N_Parameter_Association
5632 and then Nkind
(Selector_Name
(Param
)) = N_Identifier
5634 Formal
:= Selector_Name
(Param
);
5635 Actual
:= Explicit_Actual_Parameter
(Param
);
5637 -- Construct the name of formal BIPalloc. It is much easier to
5638 -- extract the name of the function using an arbitrary formal's
5639 -- scope rather than the Name field of Call.
5641 if Alloc_Nam
= No_Name
and then Present
(Entity
(Formal
)) then
5644 (Chars
(Scope
(Entity
(Formal
))),
5645 BIP_Formal_Suffix
(BIP_Alloc_Form
));
5648 -- A match for BIPalloc => 2 has been found
5650 if Chars
(Formal
) = Alloc_Nam
5651 and then Nkind
(Actual
) = N_Integer_Literal
5652 and then Intval
(Actual
) = Uint_2
5663 end Is_Secondary_Stack_BIP_Func_Call
;
5665 -------------------------------------
5666 -- Is_Tag_To_Class_Wide_Conversion --
5667 -------------------------------------
5669 function Is_Tag_To_Class_Wide_Conversion
5670 (Obj_Id
: Entity_Id
) return Boolean
5672 Expr
: constant Node_Id
:= Expression
(Parent
(Obj_Id
));
5676 Is_Class_Wide_Type
(Etype
(Obj_Id
))
5677 and then Present
(Expr
)
5678 and then Nkind
(Expr
) = N_Unchecked_Type_Conversion
5679 and then Etype
(Expression
(Expr
)) = RTE
(RE_Tag
);
5680 end Is_Tag_To_Class_Wide_Conversion
;
5682 ----------------------------
5683 -- Is_Untagged_Derivation --
5684 ----------------------------
5686 function Is_Untagged_Derivation
(T
: Entity_Id
) return Boolean is
5688 return (not Is_Tagged_Type
(T
) and then Is_Derived_Type
(T
))
5690 (Is_Private_Type
(T
) and then Present
(Full_View
(T
))
5691 and then not Is_Tagged_Type
(Full_View
(T
))
5692 and then Is_Derived_Type
(Full_View
(T
))
5693 and then Etype
(Full_View
(T
)) /= T
);
5694 end Is_Untagged_Derivation
;
5696 ---------------------------
5697 -- Is_Volatile_Reference --
5698 ---------------------------
5700 function Is_Volatile_Reference
(N
: Node_Id
) return Boolean is
5702 -- Only source references are to be treated as volatile, internally
5703 -- generated stuff cannot have volatile external effects.
5705 if not Comes_From_Source
(N
) then
5708 -- Never true for reference to a type
5710 elsif Is_Entity_Name
(N
) and then Is_Type
(Entity
(N
)) then
5713 -- Never true for a compile time known constant
5715 elsif Compile_Time_Known_Value
(N
) then
5718 -- True if object reference with volatile type
5720 elsif Is_Volatile_Object
(N
) then
5723 -- True if reference to volatile entity
5725 elsif Is_Entity_Name
(N
) then
5726 return Treat_As_Volatile
(Entity
(N
));
5728 -- True for slice of volatile array
5730 elsif Nkind
(N
) = N_Slice
then
5731 return Is_Volatile_Reference
(Prefix
(N
));
5733 -- True if volatile component
5735 elsif Nkind_In
(N
, N_Indexed_Component
, N_Selected_Component
) then
5736 if (Is_Entity_Name
(Prefix
(N
))
5737 and then Has_Volatile_Components
(Entity
(Prefix
(N
))))
5738 or else (Present
(Etype
(Prefix
(N
)))
5739 and then Has_Volatile_Components
(Etype
(Prefix
(N
))))
5743 return Is_Volatile_Reference
(Prefix
(N
));
5751 end Is_Volatile_Reference
;
5753 --------------------------
5754 -- Is_VM_By_Copy_Actual --
5755 --------------------------
5757 function Is_VM_By_Copy_Actual
(N
: Node_Id
) return Boolean is
5759 return VM_Target
/= No_VM
5760 and then (Nkind
(N
) = N_Slice
5762 (Nkind
(N
) = N_Identifier
5763 and then Present
(Renamed_Object
(Entity
(N
)))
5764 and then Nkind
(Renamed_Object
(Entity
(N
))) =
5766 end Is_VM_By_Copy_Actual
;
5768 --------------------
5769 -- Kill_Dead_Code --
5770 --------------------
5772 procedure Kill_Dead_Code
(N
: Node_Id
; Warn
: Boolean := False) is
5773 W
: Boolean := Warn
;
5774 -- Set False if warnings suppressed
5778 Remove_Warning_Messages
(N
);
5780 -- Generate warning if appropriate
5784 -- We suppress the warning if this code is under control of an
5785 -- if statement, whose condition is a simple identifier, and
5786 -- either we are in an instance, or warnings off is set for this
5787 -- identifier. The reason for killing it in the instance case is
5788 -- that it is common and reasonable for code to be deleted in
5789 -- instances for various reasons.
5791 -- Could we use Is_Statically_Unevaluated here???
5793 if Nkind
(Parent
(N
)) = N_If_Statement
then
5795 C
: constant Node_Id
:= Condition
(Parent
(N
));
5797 if Nkind
(C
) = N_Identifier
5800 or else (Present
(Entity
(C
))
5801 and then Has_Warnings_Off
(Entity
(C
))))
5808 -- Generate warning if not suppressed
5812 ("?t?this code can never be executed and has been deleted!",
5817 -- Recurse into block statements and bodies to process declarations
5820 if Nkind
(N
) = N_Block_Statement
5821 or else Nkind
(N
) = N_Subprogram_Body
5822 or else Nkind
(N
) = N_Package_Body
5824 Kill_Dead_Code
(Declarations
(N
), False);
5825 Kill_Dead_Code
(Statements
(Handled_Statement_Sequence
(N
)));
5827 if Nkind
(N
) = N_Subprogram_Body
then
5828 Set_Is_Eliminated
(Defining_Entity
(N
));
5831 elsif Nkind
(N
) = N_Package_Declaration
then
5832 Kill_Dead_Code
(Visible_Declarations
(Specification
(N
)));
5833 Kill_Dead_Code
(Private_Declarations
(Specification
(N
)));
5835 -- ??? After this point, Delete_Tree has been called on all
5836 -- declarations in Specification (N), so references to entities
5837 -- therein look suspicious.
5840 E
: Entity_Id
:= First_Entity
(Defining_Entity
(N
));
5843 while Present
(E
) loop
5844 if Ekind
(E
) = E_Operator
then
5845 Set_Is_Eliminated
(E
);
5852 -- Recurse into composite statement to kill individual statements in
5853 -- particular instantiations.
5855 elsif Nkind
(N
) = N_If_Statement
then
5856 Kill_Dead_Code
(Then_Statements
(N
));
5857 Kill_Dead_Code
(Elsif_Parts
(N
));
5858 Kill_Dead_Code
(Else_Statements
(N
));
5860 elsif Nkind
(N
) = N_Loop_Statement
then
5861 Kill_Dead_Code
(Statements
(N
));
5863 elsif Nkind
(N
) = N_Case_Statement
then
5867 Alt
:= First
(Alternatives
(N
));
5868 while Present
(Alt
) loop
5869 Kill_Dead_Code
(Statements
(Alt
));
5874 elsif Nkind
(N
) = N_Case_Statement_Alternative
then
5875 Kill_Dead_Code
(Statements
(N
));
5877 -- Deal with dead instances caused by deleting instantiations
5879 elsif Nkind
(N
) in N_Generic_Instantiation
then
5880 Remove_Dead_Instance
(N
);
5885 -- Case where argument is a list of nodes to be killed
5887 procedure Kill_Dead_Code
(L
: List_Id
; Warn
: Boolean := False) is
5894 if Is_Non_Empty_List
(L
) then
5896 while Present
(N
) loop
5897 Kill_Dead_Code
(N
, W
);
5904 ------------------------
5905 -- Known_Non_Negative --
5906 ------------------------
5908 function Known_Non_Negative
(Opnd
: Node_Id
) return Boolean is
5910 if Is_OK_Static_Expression
(Opnd
) and then Expr_Value
(Opnd
) >= 0 then
5915 Lo
: constant Node_Id
:= Type_Low_Bound
(Etype
(Opnd
));
5918 Is_OK_Static_Expression
(Lo
) and then Expr_Value
(Lo
) >= 0;
5921 end Known_Non_Negative
;
5923 --------------------
5924 -- Known_Non_Null --
5925 --------------------
5927 function Known_Non_Null
(N
: Node_Id
) return Boolean is
5929 -- Checks for case where N is an entity reference
5931 if Is_Entity_Name
(N
) and then Present
(Entity
(N
)) then
5933 E
: constant Entity_Id
:= Entity
(N
);
5938 -- First check if we are in decisive conditional
5940 Get_Current_Value_Condition
(N
, Op
, Val
);
5942 if Known_Null
(Val
) then
5943 if Op
= N_Op_Eq
then
5945 elsif Op
= N_Op_Ne
then
5950 -- If OK to do replacement, test Is_Known_Non_Null flag
5952 if OK_To_Do_Constant_Replacement
(E
) then
5953 return Is_Known_Non_Null
(E
);
5955 -- Otherwise if not safe to do replacement, then say so
5962 -- True if access attribute
5964 elsif Nkind
(N
) = N_Attribute_Reference
5965 and then Nam_In
(Attribute_Name
(N
), Name_Access
,
5966 Name_Unchecked_Access
,
5967 Name_Unrestricted_Access
)
5971 -- True if allocator
5973 elsif Nkind
(N
) = N_Allocator
then
5976 -- For a conversion, true if expression is known non-null
5978 elsif Nkind
(N
) = N_Type_Conversion
then
5979 return Known_Non_Null
(Expression
(N
));
5981 -- Above are all cases where the value could be determined to be
5982 -- non-null. In all other cases, we don't know, so return False.
5993 function Known_Null
(N
: Node_Id
) return Boolean is
5995 -- Checks for case where N is an entity reference
5997 if Is_Entity_Name
(N
) and then Present
(Entity
(N
)) then
5999 E
: constant Entity_Id
:= Entity
(N
);
6004 -- Constant null value is for sure null
6006 if Ekind
(E
) = E_Constant
6007 and then Known_Null
(Constant_Value
(E
))
6012 -- First check if we are in decisive conditional
6014 Get_Current_Value_Condition
(N
, Op
, Val
);
6016 if Known_Null
(Val
) then
6017 if Op
= N_Op_Eq
then
6019 elsif Op
= N_Op_Ne
then
6024 -- If OK to do replacement, test Is_Known_Null flag
6026 if OK_To_Do_Constant_Replacement
(E
) then
6027 return Is_Known_Null
(E
);
6029 -- Otherwise if not safe to do replacement, then say so
6036 -- True if explicit reference to null
6038 elsif Nkind
(N
) = N_Null
then
6041 -- For a conversion, true if expression is known null
6043 elsif Nkind
(N
) = N_Type_Conversion
then
6044 return Known_Null
(Expression
(N
));
6046 -- Above are all cases where the value could be determined to be null.
6047 -- In all other cases, we don't know, so return False.
6054 -----------------------------
6055 -- Make_CW_Equivalent_Type --
6056 -----------------------------
6058 -- Create a record type used as an equivalent of any member of the class
6059 -- which takes its size from exp.
6061 -- Generate the following code:
6063 -- type Equiv_T is record
6064 -- _parent : T (List of discriminant constraints taken from Exp);
6065 -- Ext__50 : Storage_Array (1 .. (Exp'size - Typ'object_size)/8);
6068 -- ??? Note that this type does not guarantee same alignment as all
6071 function Make_CW_Equivalent_Type
6073 E
: Node_Id
) return Entity_Id
6075 Loc
: constant Source_Ptr
:= Sloc
(E
);
6076 Root_Typ
: constant Entity_Id
:= Root_Type
(T
);
6077 List_Def
: constant List_Id
:= Empty_List
;
6078 Comp_List
: constant List_Id
:= New_List
;
6079 Equiv_Type
: Entity_Id
;
6080 Range_Type
: Entity_Id
;
6081 Str_Type
: Entity_Id
;
6082 Constr_Root
: Entity_Id
;
6086 -- If the root type is already constrained, there are no discriminants
6087 -- in the expression.
6089 if not Has_Discriminants
(Root_Typ
)
6090 or else Is_Constrained
(Root_Typ
)
6092 Constr_Root
:= Root_Typ
;
6094 -- At this point in the expansion, non-limited view of the type
6095 -- must be available, otherwise the error will be reported later.
6097 if From_Limited_With
(Constr_Root
)
6098 and then Present
(Non_Limited_View
(Constr_Root
))
6100 Constr_Root
:= Non_Limited_View
(Constr_Root
);
6104 Constr_Root
:= Make_Temporary
(Loc
, 'R');
6106 -- subtype cstr__n is T (List of discr constraints taken from Exp)
6108 Append_To
(List_Def
,
6109 Make_Subtype_Declaration
(Loc
,
6110 Defining_Identifier
=> Constr_Root
,
6111 Subtype_Indication
=> Make_Subtype_From_Expr
(E
, Root_Typ
)));
6114 -- Generate the range subtype declaration
6116 Range_Type
:= Make_Temporary
(Loc
, 'G');
6118 if not Is_Interface
(Root_Typ
) then
6120 -- subtype rg__xx is
6121 -- Storage_Offset range 1 .. (Expr'size - typ'size) / Storage_Unit
6124 Make_Op_Subtract
(Loc
,
6126 Make_Attribute_Reference
(Loc
,
6128 OK_Convert_To
(T
, Duplicate_Subexpr_No_Checks
(E
)),
6129 Attribute_Name
=> Name_Size
),
6131 Make_Attribute_Reference
(Loc
,
6132 Prefix
=> New_Occurrence_Of
(Constr_Root
, Loc
),
6133 Attribute_Name
=> Name_Object_Size
));
6135 -- subtype rg__xx is
6136 -- Storage_Offset range 1 .. Expr'size / Storage_Unit
6139 Make_Attribute_Reference
(Loc
,
6141 OK_Convert_To
(T
, Duplicate_Subexpr_No_Checks
(E
)),
6142 Attribute_Name
=> Name_Size
);
6145 Set_Paren_Count
(Sizexpr
, 1);
6147 Append_To
(List_Def
,
6148 Make_Subtype_Declaration
(Loc
,
6149 Defining_Identifier
=> Range_Type
,
6150 Subtype_Indication
=>
6151 Make_Subtype_Indication
(Loc
,
6152 Subtype_Mark
=> New_Occurrence_Of
(RTE
(RE_Storage_Offset
), Loc
),
6153 Constraint
=> Make_Range_Constraint
(Loc
,
6156 Low_Bound
=> Make_Integer_Literal
(Loc
, 1),
6158 Make_Op_Divide
(Loc
,
6159 Left_Opnd
=> Sizexpr
,
6160 Right_Opnd
=> Make_Integer_Literal
(Loc
,
6161 Intval
=> System_Storage_Unit
)))))));
6163 -- subtype str__nn is Storage_Array (rg__x);
6165 Str_Type
:= Make_Temporary
(Loc
, 'S');
6166 Append_To
(List_Def
,
6167 Make_Subtype_Declaration
(Loc
,
6168 Defining_Identifier
=> Str_Type
,
6169 Subtype_Indication
=>
6170 Make_Subtype_Indication
(Loc
,
6171 Subtype_Mark
=> New_Occurrence_Of
(RTE
(RE_Storage_Array
), Loc
),
6173 Make_Index_Or_Discriminant_Constraint
(Loc
,
6175 New_List
(New_Occurrence_Of
(Range_Type
, Loc
))))));
6177 -- type Equiv_T is record
6178 -- [ _parent : Tnn; ]
6182 Equiv_Type
:= Make_Temporary
(Loc
, 'T');
6183 Set_Ekind
(Equiv_Type
, E_Record_Type
);
6184 Set_Parent_Subtype
(Equiv_Type
, Constr_Root
);
6186 -- Set Is_Class_Wide_Equivalent_Type very early to trigger the special
6187 -- treatment for this type. In particular, even though _parent's type
6188 -- is a controlled type or contains controlled components, we do not
6189 -- want to set Has_Controlled_Component on it to avoid making it gain
6190 -- an unwanted _controller component.
6192 Set_Is_Class_Wide_Equivalent_Type
(Equiv_Type
);
6194 -- A class-wide equivalent type does not require initialization
6196 Set_Suppress_Initialization
(Equiv_Type
);
6198 if not Is_Interface
(Root_Typ
) then
6199 Append_To
(Comp_List
,
6200 Make_Component_Declaration
(Loc
,
6201 Defining_Identifier
=>
6202 Make_Defining_Identifier
(Loc
, Name_uParent
),
6203 Component_Definition
=>
6204 Make_Component_Definition
(Loc
,
6205 Aliased_Present
=> False,
6206 Subtype_Indication
=> New_Occurrence_Of
(Constr_Root
, Loc
))));
6209 Append_To
(Comp_List
,
6210 Make_Component_Declaration
(Loc
,
6211 Defining_Identifier
=> Make_Temporary
(Loc
, 'C'),
6212 Component_Definition
=>
6213 Make_Component_Definition
(Loc
,
6214 Aliased_Present
=> False,
6215 Subtype_Indication
=> New_Occurrence_Of
(Str_Type
, Loc
))));
6217 Append_To
(List_Def
,
6218 Make_Full_Type_Declaration
(Loc
,
6219 Defining_Identifier
=> Equiv_Type
,
6221 Make_Record_Definition
(Loc
,
6223 Make_Component_List
(Loc
,
6224 Component_Items
=> Comp_List
,
6225 Variant_Part
=> Empty
))));
6227 -- Suppress all checks during the analysis of the expanded code to avoid
6228 -- the generation of spurious warnings under ZFP run-time.
6230 Insert_Actions
(E
, List_Def
, Suppress
=> All_Checks
);
6232 end Make_CW_Equivalent_Type
;
6234 -------------------------
6235 -- Make_Invariant_Call --
6236 -------------------------
6238 function Make_Invariant_Call
(Expr
: Node_Id
) return Node_Id
is
6239 Loc
: constant Source_Ptr
:= Sloc
(Expr
);
6243 Typ
:= Etype
(Expr
);
6245 -- Subtypes may be subject to invariants coming from their respective
6246 -- base types. The subtype may be fully or partially private.
6248 if Ekind_In
(Typ
, E_Array_Subtype
,
6251 E_Record_Subtype_With_Private
)
6253 Typ
:= Base_Type
(Typ
);
6257 (Has_Invariants
(Typ
) and then Present
(Invariant_Procedure
(Typ
)));
6260 Make_Procedure_Call_Statement
(Loc
,
6262 New_Occurrence_Of
(Invariant_Procedure
(Typ
), Loc
),
6263 Parameter_Associations
=> New_List
(Relocate_Node
(Expr
)));
6264 end Make_Invariant_Call
;
6266 ------------------------
6267 -- Make_Literal_Range --
6268 ------------------------
6270 function Make_Literal_Range
6272 Literal_Typ
: Entity_Id
) return Node_Id
6274 Lo
: constant Node_Id
:=
6275 New_Copy_Tree
(String_Literal_Low_Bound
(Literal_Typ
));
6276 Index
: constant Entity_Id
:= Etype
(Lo
);
6279 Length_Expr
: constant Node_Id
:=
6280 Make_Op_Subtract
(Loc
,
6282 Make_Integer_Literal
(Loc
,
6283 Intval
=> String_Literal_Length
(Literal_Typ
)),
6285 Make_Integer_Literal
(Loc
, 1));
6288 Set_Analyzed
(Lo
, False);
6290 if Is_Integer_Type
(Index
) then
6293 Left_Opnd
=> New_Copy_Tree
(Lo
),
6294 Right_Opnd
=> Length_Expr
);
6297 Make_Attribute_Reference
(Loc
,
6298 Attribute_Name
=> Name_Val
,
6299 Prefix
=> New_Occurrence_Of
(Index
, Loc
),
6300 Expressions
=> New_List
(
6303 Make_Attribute_Reference
(Loc
,
6304 Attribute_Name
=> Name_Pos
,
6305 Prefix
=> New_Occurrence_Of
(Index
, Loc
),
6306 Expressions
=> New_List
(New_Copy_Tree
(Lo
))),
6307 Right_Opnd
=> Length_Expr
)));
6314 end Make_Literal_Range
;
6316 --------------------------
6317 -- Make_Non_Empty_Check --
6318 --------------------------
6320 function Make_Non_Empty_Check
6322 N
: Node_Id
) return Node_Id
6328 Make_Attribute_Reference
(Loc
,
6329 Attribute_Name
=> Name_Length
,
6330 Prefix
=> Duplicate_Subexpr_No_Checks
(N
, Name_Req
=> True)),
6332 Make_Integer_Literal
(Loc
, 0));
6333 end Make_Non_Empty_Check
;
6335 -------------------------
6336 -- Make_Predicate_Call --
6337 -------------------------
6339 function Make_Predicate_Call
6342 Mem
: Boolean := False) return Node_Id
6344 Loc
: constant Source_Ptr
:= Sloc
(Expr
);
6347 pragma Assert
(Present
(Predicate_Function
(Typ
)));
6349 -- Call special membership version if requested and available
6353 PFM
: constant Entity_Id
:= Predicate_Function_M
(Typ
);
6355 if Present
(PFM
) then
6357 Make_Function_Call
(Loc
,
6358 Name
=> New_Occurrence_Of
(PFM
, Loc
),
6359 Parameter_Associations
=> New_List
(Relocate_Node
(Expr
)));
6364 -- Case of calling normal predicate function
6367 Make_Function_Call
(Loc
,
6369 New_Occurrence_Of
(Predicate_Function
(Typ
), Loc
),
6370 Parameter_Associations
=> New_List
(Relocate_Node
(Expr
)));
6371 end Make_Predicate_Call
;
6373 --------------------------
6374 -- Make_Predicate_Check --
6375 --------------------------
6377 function Make_Predicate_Check
6379 Expr
: Node_Id
) return Node_Id
6381 Loc
: constant Source_Ptr
:= Sloc
(Expr
);
6385 -- If predicate checks are suppressed, then return a null statement.
6386 -- For this call, we check only the scope setting. If the caller wants
6387 -- to check a specific entity's setting, they must do it manually.
6389 if Predicate_Checks_Suppressed
(Empty
) then
6390 return Make_Null_Statement
(Loc
);
6393 -- Do not generate a check within an internal subprogram (stream
6394 -- functions and the like, including including predicate functions).
6396 if Within_Internal_Subprogram
then
6397 return Make_Null_Statement
(Loc
);
6400 -- Compute proper name to use, we need to get this right so that the
6401 -- right set of check policies apply to the Check pragma we are making.
6403 if Has_Dynamic_Predicate_Aspect
(Typ
) then
6404 Nam
:= Name_Dynamic_Predicate
;
6405 elsif Has_Static_Predicate_Aspect
(Typ
) then
6406 Nam
:= Name_Static_Predicate
;
6408 Nam
:= Name_Predicate
;
6413 Pragma_Identifier
=> Make_Identifier
(Loc
, Name_Check
),
6414 Pragma_Argument_Associations
=> New_List
(
6415 Make_Pragma_Argument_Association
(Loc
,
6416 Expression
=> Make_Identifier
(Loc
, Nam
)),
6417 Make_Pragma_Argument_Association
(Loc
,
6418 Expression
=> Make_Predicate_Call
(Typ
, Expr
))));
6419 end Make_Predicate_Check
;
6421 ----------------------------
6422 -- Make_Subtype_From_Expr --
6423 ----------------------------
6425 -- 1. If Expr is an unconstrained array expression, creates
6426 -- Unc_Type(Expr'first(1)..Expr'last(1),..., Expr'first(n)..Expr'last(n))
6428 -- 2. If Expr is a unconstrained discriminated type expression, creates
6429 -- Unc_Type(Expr.Discr1, ... , Expr.Discr_n)
6431 -- 3. If Expr is class-wide, creates an implicit class-wide subtype
6433 function Make_Subtype_From_Expr
6435 Unc_Typ
: Entity_Id
) return Node_Id
6437 List_Constr
: constant List_Id
:= New_List
;
6438 Loc
: constant Source_Ptr
:= Sloc
(E
);
6441 Full_Subtyp
: Entity_Id
;
6442 High_Bound
: Entity_Id
;
6443 Index_Typ
: Entity_Id
;
6444 Low_Bound
: Entity_Id
;
6445 Priv_Subtyp
: Entity_Id
;
6449 if Is_Private_Type
(Unc_Typ
)
6450 and then Has_Unknown_Discriminants
(Unc_Typ
)
6452 -- Prepare the subtype completion. Use the base type to find the
6453 -- underlying type because the type may be a generic actual or an
6454 -- explicit subtype.
6456 Utyp
:= Underlying_Type
(Base_Type
(Unc_Typ
));
6457 Full_Subtyp
:= Make_Temporary
(Loc
, 'C');
6459 Unchecked_Convert_To
(Utyp
, Duplicate_Subexpr_No_Checks
(E
));
6460 Set_Parent
(Full_Exp
, Parent
(E
));
6462 Priv_Subtyp
:= Make_Temporary
(Loc
, 'P');
6465 Make_Subtype_Declaration
(Loc
,
6466 Defining_Identifier
=> Full_Subtyp
,
6467 Subtype_Indication
=> Make_Subtype_From_Expr
(Full_Exp
, Utyp
)));
6469 -- Define the dummy private subtype
6471 Set_Ekind
(Priv_Subtyp
, Subtype_Kind
(Ekind
(Unc_Typ
)));
6472 Set_Etype
(Priv_Subtyp
, Base_Type
(Unc_Typ
));
6473 Set_Scope
(Priv_Subtyp
, Full_Subtyp
);
6474 Set_Is_Constrained
(Priv_Subtyp
);
6475 Set_Is_Tagged_Type
(Priv_Subtyp
, Is_Tagged_Type
(Unc_Typ
));
6476 Set_Is_Itype
(Priv_Subtyp
);
6477 Set_Associated_Node_For_Itype
(Priv_Subtyp
, E
);
6479 if Is_Tagged_Type
(Priv_Subtyp
) then
6481 (Base_Type
(Priv_Subtyp
), Class_Wide_Type
(Unc_Typ
));
6482 Set_Direct_Primitive_Operations
(Priv_Subtyp
,
6483 Direct_Primitive_Operations
(Unc_Typ
));
6486 Set_Full_View
(Priv_Subtyp
, Full_Subtyp
);
6488 return New_Occurrence_Of
(Priv_Subtyp
, Loc
);
6490 elsif Is_Array_Type
(Unc_Typ
) then
6491 Index_Typ
:= First_Index
(Unc_Typ
);
6492 for J
in 1 .. Number_Dimensions
(Unc_Typ
) loop
6494 -- Capture the bounds of each index constraint in case the context
6495 -- is an object declaration of an unconstrained type initialized
6496 -- by a function call:
6498 -- Obj : Unconstr_Typ := Func_Call;
6500 -- This scenario requires secondary scope management and the index
6501 -- constraint cannot depend on the temporary used to capture the
6502 -- result of the function call.
6505 -- Temp : Unconstr_Typ_Ptr := Func_Call'reference;
6506 -- subtype S is Unconstr_Typ (Temp.all'First .. Temp.all'Last);
6507 -- Obj : S := Temp.all;
6508 -- SS_Release; -- Temp is gone at this point, bounds of S are
6512 -- Low_Bound : constant Base_Type (Index_Typ) := E'First (J);
6514 Low_Bound
:= Make_Temporary
(Loc
, 'B');
6516 Make_Object_Declaration
(Loc
,
6517 Defining_Identifier
=> Low_Bound
,
6518 Object_Definition
=>
6519 New_Occurrence_Of
(Base_Type
(Etype
(Index_Typ
)), Loc
),
6520 Constant_Present
=> True,
6522 Make_Attribute_Reference
(Loc
,
6523 Prefix
=> Duplicate_Subexpr_No_Checks
(E
),
6524 Attribute_Name
=> Name_First
,
6525 Expressions
=> New_List
(
6526 Make_Integer_Literal
(Loc
, J
)))));
6529 -- High_Bound : constant Base_Type (Index_Typ) := E'Last (J);
6531 High_Bound
:= Make_Temporary
(Loc
, 'B');
6533 Make_Object_Declaration
(Loc
,
6534 Defining_Identifier
=> High_Bound
,
6535 Object_Definition
=>
6536 New_Occurrence_Of
(Base_Type
(Etype
(Index_Typ
)), Loc
),
6537 Constant_Present
=> True,
6539 Make_Attribute_Reference
(Loc
,
6540 Prefix
=> Duplicate_Subexpr_No_Checks
(E
),
6541 Attribute_Name
=> Name_Last
,
6542 Expressions
=> New_List
(
6543 Make_Integer_Literal
(Loc
, J
)))));
6545 Append_To
(List_Constr
,
6547 Low_Bound
=> New_Occurrence_Of
(Low_Bound
, Loc
),
6548 High_Bound
=> New_Occurrence_Of
(High_Bound
, Loc
)));
6550 Index_Typ
:= Next_Index
(Index_Typ
);
6553 elsif Is_Class_Wide_Type
(Unc_Typ
) then
6555 CW_Subtype
: Entity_Id
;
6556 EQ_Typ
: Entity_Id
:= Empty
;
6559 -- A class-wide equivalent type is not needed when VM_Target
6560 -- because the VM back-ends handle the class-wide object
6561 -- initialization itself (and doesn't need or want the
6562 -- additional intermediate type to handle the assignment).
6564 if Expander_Active
and then Tagged_Type_Expansion
then
6566 -- If this is the class-wide type of a completion that is a
6567 -- record subtype, set the type of the class-wide type to be
6568 -- the full base type, for use in the expanded code for the
6569 -- equivalent type. Should this be done earlier when the
6570 -- completion is analyzed ???
6572 if Is_Private_Type
(Etype
(Unc_Typ
))
6574 Ekind
(Full_View
(Etype
(Unc_Typ
))) = E_Record_Subtype
6576 Set_Etype
(Unc_Typ
, Base_Type
(Full_View
(Etype
(Unc_Typ
))));
6579 EQ_Typ
:= Make_CW_Equivalent_Type
(Unc_Typ
, E
);
6582 CW_Subtype
:= New_Class_Wide_Subtype
(Unc_Typ
, E
);
6583 Set_Equivalent_Type
(CW_Subtype
, EQ_Typ
);
6584 Set_Cloned_Subtype
(CW_Subtype
, Base_Type
(Unc_Typ
));
6586 return New_Occurrence_Of
(CW_Subtype
, Loc
);
6589 -- Indefinite record type with discriminants
6592 D
:= First_Discriminant
(Unc_Typ
);
6593 while Present
(D
) loop
6594 Append_To
(List_Constr
,
6595 Make_Selected_Component
(Loc
,
6596 Prefix
=> Duplicate_Subexpr_No_Checks
(E
),
6597 Selector_Name
=> New_Occurrence_Of
(D
, Loc
)));
6599 Next_Discriminant
(D
);
6604 Make_Subtype_Indication
(Loc
,
6605 Subtype_Mark
=> New_Occurrence_Of
(Unc_Typ
, Loc
),
6607 Make_Index_Or_Discriminant_Constraint
(Loc
,
6608 Constraints
=> List_Constr
));
6609 end Make_Subtype_From_Expr
;
6611 ----------------------------
6612 -- Matching_Standard_Type --
6613 ----------------------------
6615 function Matching_Standard_Type
(Typ
: Entity_Id
) return Entity_Id
is
6616 pragma Assert
(Is_Scalar_Type
(Typ
));
6617 Siz
: constant Uint
:= Esize
(Typ
);
6620 -- Floating-point cases
6622 if Is_Floating_Point_Type
(Typ
) then
6623 if Siz
<= Esize
(Standard_Short_Float
) then
6624 return Standard_Short_Float
;
6625 elsif Siz
<= Esize
(Standard_Float
) then
6626 return Standard_Float
;
6627 elsif Siz
<= Esize
(Standard_Long_Float
) then
6628 return Standard_Long_Float
;
6629 elsif Siz
<= Esize
(Standard_Long_Long_Float
) then
6630 return Standard_Long_Long_Float
;
6632 raise Program_Error
;
6635 -- Integer cases (includes fixed-point types)
6637 -- Unsigned integer cases (includes normal enumeration types)
6639 elsif Is_Unsigned_Type
(Typ
) then
6640 if Siz
<= Esize
(Standard_Short_Short_Unsigned
) then
6641 return Standard_Short_Short_Unsigned
;
6642 elsif Siz
<= Esize
(Standard_Short_Unsigned
) then
6643 return Standard_Short_Unsigned
;
6644 elsif Siz
<= Esize
(Standard_Unsigned
) then
6645 return Standard_Unsigned
;
6646 elsif Siz
<= Esize
(Standard_Long_Unsigned
) then
6647 return Standard_Long_Unsigned
;
6648 elsif Siz
<= Esize
(Standard_Long_Long_Unsigned
) then
6649 return Standard_Long_Long_Unsigned
;
6651 raise Program_Error
;
6654 -- Signed integer cases
6657 if Siz
<= Esize
(Standard_Short_Short_Integer
) then
6658 return Standard_Short_Short_Integer
;
6659 elsif Siz
<= Esize
(Standard_Short_Integer
) then
6660 return Standard_Short_Integer
;
6661 elsif Siz
<= Esize
(Standard_Integer
) then
6662 return Standard_Integer
;
6663 elsif Siz
<= Esize
(Standard_Long_Integer
) then
6664 return Standard_Long_Integer
;
6665 elsif Siz
<= Esize
(Standard_Long_Long_Integer
) then
6666 return Standard_Long_Long_Integer
;
6668 raise Program_Error
;
6671 end Matching_Standard_Type
;
6673 -----------------------------
6674 -- May_Generate_Large_Temp --
6675 -----------------------------
6677 -- At the current time, the only types that we return False for (i.e. where
6678 -- we decide we know they cannot generate large temps) are ones where we
6679 -- know the size is 256 bits or less at compile time, and we are still not
6680 -- doing a thorough job on arrays and records ???
6682 function May_Generate_Large_Temp
(Typ
: Entity_Id
) return Boolean is
6684 if not Size_Known_At_Compile_Time
(Typ
) then
6687 elsif Esize
(Typ
) /= 0 and then Esize
(Typ
) <= 256 then
6690 elsif Is_Array_Type
(Typ
)
6691 and then Present
(Packed_Array_Impl_Type
(Typ
))
6693 return May_Generate_Large_Temp
(Packed_Array_Impl_Type
(Typ
));
6695 -- We could do more here to find other small types ???
6700 end May_Generate_Large_Temp
;
6702 ------------------------
6703 -- Needs_Finalization --
6704 ------------------------
6706 function Needs_Finalization
(T
: Entity_Id
) return Boolean is
6707 function Has_Some_Controlled_Component
(Rec
: Entity_Id
) return Boolean;
6708 -- If type is not frozen yet, check explicitly among its components,
6709 -- because the Has_Controlled_Component flag is not necessarily set.
6711 -----------------------------------
6712 -- Has_Some_Controlled_Component --
6713 -----------------------------------
6715 function Has_Some_Controlled_Component
6716 (Rec
: Entity_Id
) return Boolean
6721 if Has_Controlled_Component
(Rec
) then
6724 elsif not Is_Frozen
(Rec
) then
6725 if Is_Record_Type
(Rec
) then
6726 Comp
:= First_Entity
(Rec
);
6728 while Present
(Comp
) loop
6729 if not Is_Type
(Comp
)
6730 and then Needs_Finalization
(Etype
(Comp
))
6740 elsif Is_Array_Type
(Rec
) then
6741 return Needs_Finalization
(Component_Type
(Rec
));
6744 return Has_Controlled_Component
(Rec
);
6749 end Has_Some_Controlled_Component
;
6751 -- Start of processing for Needs_Finalization
6754 -- Certain run-time configurations and targets do not provide support
6755 -- for controlled types.
6757 if Restriction_Active
(No_Finalization
) then
6760 -- C++, CIL and Java types are not considered controlled. It is assumed
6761 -- that the non-Ada side will handle their clean up.
6763 elsif Convention
(T
) = Convention_CIL
6764 or else Convention
(T
) = Convention_CPP
6765 or else Convention
(T
) = Convention_Java
6770 -- Class-wide types are treated as controlled because derivations
6771 -- from the root type can introduce controlled components.
6774 Is_Class_Wide_Type
(T
)
6775 or else Is_Controlled
(T
)
6776 or else Has_Controlled_Component
(T
)
6777 or else Has_Some_Controlled_Component
(T
)
6779 (Is_Concurrent_Type
(T
)
6780 and then Present
(Corresponding_Record_Type
(T
))
6781 and then Needs_Finalization
(Corresponding_Record_Type
(T
)));
6783 end Needs_Finalization
;
6785 ----------------------------
6786 -- Needs_Constant_Address --
6787 ----------------------------
6789 function Needs_Constant_Address
6791 Typ
: Entity_Id
) return Boolean
6795 -- If we have no initialization of any kind, then we don't need to place
6796 -- any restrictions on the address clause, because the object will be
6797 -- elaborated after the address clause is evaluated. This happens if the
6798 -- declaration has no initial expression, or the type has no implicit
6799 -- initialization, or the object is imported.
6801 -- The same holds for all initialized scalar types and all access types.
6802 -- Packed bit arrays of size up to 64 are represented using a modular
6803 -- type with an initialization (to zero) and can be processed like other
6804 -- initialized scalar types.
6806 -- If the type is controlled, code to attach the object to a
6807 -- finalization chain is generated at the point of declaration, and
6808 -- therefore the elaboration of the object cannot be delayed: the
6809 -- address expression must be a constant.
6811 if No
(Expression
(Decl
))
6812 and then not Needs_Finalization
(Typ
)
6814 (not Has_Non_Null_Base_Init_Proc
(Typ
)
6815 or else Is_Imported
(Defining_Identifier
(Decl
)))
6819 elsif (Present
(Expression
(Decl
)) and then Is_Scalar_Type
(Typ
))
6820 or else Is_Access_Type
(Typ
)
6822 (Is_Bit_Packed_Array
(Typ
)
6823 and then Is_Modular_Integer_Type
(Packed_Array_Impl_Type
(Typ
)))
6829 -- Otherwise, we require the address clause to be constant because
6830 -- the call to the initialization procedure (or the attach code) has
6831 -- to happen at the point of the declaration.
6833 -- Actually the IP call has been moved to the freeze actions anyway,
6834 -- so maybe we can relax this restriction???
6838 end Needs_Constant_Address
;
6840 ----------------------------
6841 -- New_Class_Wide_Subtype --
6842 ----------------------------
6844 function New_Class_Wide_Subtype
6845 (CW_Typ
: Entity_Id
;
6846 N
: Node_Id
) return Entity_Id
6848 Res
: constant Entity_Id
:= Create_Itype
(E_Void
, N
);
6849 Res_Name
: constant Name_Id
:= Chars
(Res
);
6850 Res_Scope
: constant Entity_Id
:= Scope
(Res
);
6853 Copy_Node
(CW_Typ
, Res
);
6854 Set_Comes_From_Source
(Res
, False);
6855 Set_Sloc
(Res
, Sloc
(N
));
6857 Set_Associated_Node_For_Itype
(Res
, N
);
6858 Set_Is_Public
(Res
, False); -- By default, may be changed below.
6859 Set_Public_Status
(Res
);
6860 Set_Chars
(Res
, Res_Name
);
6861 Set_Scope
(Res
, Res_Scope
);
6862 Set_Ekind
(Res
, E_Class_Wide_Subtype
);
6863 Set_Next_Entity
(Res
, Empty
);
6864 Set_Etype
(Res
, Base_Type
(CW_Typ
));
6865 Set_Is_Frozen
(Res
, False);
6866 Set_Freeze_Node
(Res
, Empty
);
6868 end New_Class_Wide_Subtype
;
6870 --------------------------------
6871 -- Non_Limited_Designated_Type --
6872 ---------------------------------
6874 function Non_Limited_Designated_Type
(T
: Entity_Id
) return Entity_Id
is
6875 Desig
: constant Entity_Id
:= Designated_Type
(T
);
6877 if Ekind
(Desig
) = E_Incomplete_Type
6878 and then Present
(Non_Limited_View
(Desig
))
6880 return Non_Limited_View
(Desig
);
6884 end Non_Limited_Designated_Type
;
6886 -----------------------------------
6887 -- OK_To_Do_Constant_Replacement --
6888 -----------------------------------
6890 function OK_To_Do_Constant_Replacement
(E
: Entity_Id
) return Boolean is
6891 ES
: constant Entity_Id
:= Scope
(E
);
6895 -- Do not replace statically allocated objects, because they may be
6896 -- modified outside the current scope.
6898 if Is_Statically_Allocated
(E
) then
6901 -- Do not replace aliased or volatile objects, since we don't know what
6902 -- else might change the value.
6904 elsif Is_Aliased
(E
) or else Treat_As_Volatile
(E
) then
6907 -- Debug flag -gnatdM disconnects this optimization
6909 elsif Debug_Flag_MM
then
6912 -- Otherwise check scopes
6915 CS
:= Current_Scope
;
6918 -- If we are in right scope, replacement is safe
6923 -- Packages do not affect the determination of safety
6925 elsif Ekind
(CS
) = E_Package
then
6926 exit when CS
= Standard_Standard
;
6929 -- Blocks do not affect the determination of safety
6931 elsif Ekind
(CS
) = E_Block
then
6934 -- Loops do not affect the determination of safety. Note that we
6935 -- kill all current values on entry to a loop, so we are just
6936 -- talking about processing within a loop here.
6938 elsif Ekind
(CS
) = E_Loop
then
6941 -- Otherwise, the reference is dubious, and we cannot be sure that
6942 -- it is safe to do the replacement.
6951 end OK_To_Do_Constant_Replacement
;
6953 ------------------------------------
6954 -- Possible_Bit_Aligned_Component --
6955 ------------------------------------
6957 function Possible_Bit_Aligned_Component
(N
: Node_Id
) return Boolean is
6959 -- Do not process an unanalyzed node because it is not yet decorated and
6960 -- most checks performed below will fail.
6962 if not Analyzed
(N
) then
6968 -- Case of indexed component
6970 when N_Indexed_Component
=>
6972 P
: constant Node_Id
:= Prefix
(N
);
6973 Ptyp
: constant Entity_Id
:= Etype
(P
);
6976 -- If we know the component size and it is less than 64, then
6977 -- we are definitely OK. The back end always does assignment of
6978 -- misaligned small objects correctly.
6980 if Known_Static_Component_Size
(Ptyp
)
6981 and then Component_Size
(Ptyp
) <= 64
6985 -- Otherwise, we need to test the prefix, to see if we are
6986 -- indexing from a possibly unaligned component.
6989 return Possible_Bit_Aligned_Component
(P
);
6993 -- Case of selected component
6995 when N_Selected_Component
=>
6997 P
: constant Node_Id
:= Prefix
(N
);
6998 Comp
: constant Entity_Id
:= Entity
(Selector_Name
(N
));
7001 -- If there is no component clause, then we are in the clear
7002 -- since the back end will never misalign a large component
7003 -- unless it is forced to do so. In the clear means we need
7004 -- only the recursive test on the prefix.
7006 if Component_May_Be_Bit_Aligned
(Comp
) then
7009 return Possible_Bit_Aligned_Component
(P
);
7013 -- For a slice, test the prefix, if that is possibly misaligned,
7014 -- then for sure the slice is.
7017 return Possible_Bit_Aligned_Component
(Prefix
(N
));
7019 -- For an unchecked conversion, check whether the expression may
7022 when N_Unchecked_Type_Conversion
=>
7023 return Possible_Bit_Aligned_Component
(Expression
(N
));
7025 -- If we have none of the above, it means that we have fallen off the
7026 -- top testing prefixes recursively, and we now have a stand alone
7027 -- object, where we don't have a problem, unless this is a renaming,
7028 -- in which case we need to look into the renamed object.
7031 if Is_Entity_Name
(N
)
7032 and then Present
(Renamed_Object
(Entity
(N
)))
7035 Possible_Bit_Aligned_Component
(Renamed_Object
(Entity
(N
)));
7041 end Possible_Bit_Aligned_Component
;
7043 -----------------------------------------------
7044 -- Process_Statements_For_Controlled_Objects --
7045 -----------------------------------------------
7047 procedure Process_Statements_For_Controlled_Objects
(N
: Node_Id
) is
7048 Loc
: constant Source_Ptr
:= Sloc
(N
);
7050 function Are_Wrapped
(L
: List_Id
) return Boolean;
7051 -- Determine whether list L contains only one statement which is a block
7053 function Wrap_Statements_In_Block
7055 Scop
: Entity_Id
:= Current_Scope
) return Node_Id
;
7056 -- Given a list of statements L, wrap it in a block statement and return
7057 -- the generated node. Scop is either the current scope or the scope of
7058 -- the context (if applicable).
7064 function Are_Wrapped
(L
: List_Id
) return Boolean is
7065 Stmt
: constant Node_Id
:= First
(L
);
7069 and then No
(Next
(Stmt
))
7070 and then Nkind
(Stmt
) = N_Block_Statement
;
7073 ------------------------------
7074 -- Wrap_Statements_In_Block --
7075 ------------------------------
7077 function Wrap_Statements_In_Block
7079 Scop
: Entity_Id
:= Current_Scope
) return Node_Id
7081 Block_Id
: Entity_Id
;
7082 Block_Nod
: Node_Id
;
7083 Iter_Loop
: Entity_Id
;
7087 Make_Block_Statement
(Loc
,
7088 Declarations
=> No_List
,
7089 Handled_Statement_Sequence
=>
7090 Make_Handled_Sequence_Of_Statements
(Loc
,
7093 -- Create a label for the block in case the block needs to manage the
7094 -- secondary stack. A label allows for flag Uses_Sec_Stack to be set.
7096 Add_Block_Identifier
(Block_Nod
, Block_Id
);
7098 -- When wrapping the statements of an iterator loop, check whether
7099 -- the loop requires secondary stack management and if so, propagate
7100 -- the appropriate flags to the block. This ensures that the cursor
7101 -- is properly cleaned up at each iteration of the loop.
7103 Iter_Loop
:= Find_Enclosing_Iterator_Loop
(Scop
);
7105 if Present
(Iter_Loop
) then
7106 Set_Uses_Sec_Stack
(Block_Id
, Uses_Sec_Stack
(Iter_Loop
));
7108 -- Secondary stack reclamation is suppressed when the associated
7109 -- iterator loop contains a return statement which uses the stack.
7111 Set_Sec_Stack_Needed_For_Return
7112 (Block_Id
, Sec_Stack_Needed_For_Return
(Iter_Loop
));
7116 end Wrap_Statements_In_Block
;
7122 -- Start of processing for Process_Statements_For_Controlled_Objects
7125 -- Whenever a non-handled statement list is wrapped in a block, the
7126 -- block must be explicitly analyzed to redecorate all entities in the
7127 -- list and ensure that a finalizer is properly built.
7132 N_Conditional_Entry_Call |
7133 N_Selective_Accept
=>
7135 -- Check the "then statements" for elsif parts and if statements
7137 if Nkind_In
(N
, N_Elsif_Part
, N_If_Statement
)
7138 and then not Is_Empty_List
(Then_Statements
(N
))
7139 and then not Are_Wrapped
(Then_Statements
(N
))
7140 and then Requires_Cleanup_Actions
7141 (Then_Statements
(N
), False, False)
7143 Block
:= Wrap_Statements_In_Block
(Then_Statements
(N
));
7144 Set_Then_Statements
(N
, New_List
(Block
));
7149 -- Check the "else statements" for conditional entry calls, if
7150 -- statements and selective accepts.
7152 if Nkind_In
(N
, N_Conditional_Entry_Call
,
7155 and then not Is_Empty_List
(Else_Statements
(N
))
7156 and then not Are_Wrapped
(Else_Statements
(N
))
7157 and then Requires_Cleanup_Actions
7158 (Else_Statements
(N
), False, False)
7160 Block
:= Wrap_Statements_In_Block
(Else_Statements
(N
));
7161 Set_Else_Statements
(N
, New_List
(Block
));
7166 when N_Abortable_Part |
7167 N_Accept_Alternative |
7168 N_Case_Statement_Alternative |
7169 N_Delay_Alternative |
7170 N_Entry_Call_Alternative |
7171 N_Exception_Handler |
7173 N_Triggering_Alternative
=>
7175 if not Is_Empty_List
(Statements
(N
))
7176 and then not Are_Wrapped
(Statements
(N
))
7177 and then Requires_Cleanup_Actions
(Statements
(N
), False, False)
7179 if Nkind
(N
) = N_Loop_Statement
7180 and then Present
(Identifier
(N
))
7183 Wrap_Statements_In_Block
7184 (L
=> Statements
(N
),
7185 Scop
=> Entity
(Identifier
(N
)));
7187 Block
:= Wrap_Statements_In_Block
(Statements
(N
));
7190 Set_Statements
(N
, New_List
(Block
));
7197 end Process_Statements_For_Controlled_Objects
;
7203 function Power_Of_Two
(N
: Node_Id
) return Nat
is
7204 Typ
: constant Entity_Id
:= Etype
(N
);
7205 pragma Assert
(Is_Integer_Type
(Typ
));
7207 Siz
: constant Nat
:= UI_To_Int
(Esize
(Typ
));
7211 if not Compile_Time_Known_Value
(N
) then
7215 Val
:= Expr_Value
(N
);
7216 for J
in 1 .. Siz
- 1 loop
7217 if Val
= Uint_2
** J
then
7226 ----------------------
7227 -- Remove_Init_Call --
7228 ----------------------
7230 function Remove_Init_Call
7232 Rep_Clause
: Node_Id
) return Node_Id
7234 Par
: constant Node_Id
:= Parent
(Var
);
7235 Typ
: constant Entity_Id
:= Etype
(Var
);
7237 Init_Proc
: Entity_Id
;
7238 -- Initialization procedure for Typ
7240 function Find_Init_Call_In_List
(From
: Node_Id
) return Node_Id
;
7241 -- Look for init call for Var starting at From and scanning the
7242 -- enclosing list until Rep_Clause or the end of the list is reached.
7244 ----------------------------
7245 -- Find_Init_Call_In_List --
7246 ----------------------------
7248 function Find_Init_Call_In_List
(From
: Node_Id
) return Node_Id
is
7249 Init_Call
: Node_Id
;
7253 while Present
(Init_Call
) and then Init_Call
/= Rep_Clause
loop
7254 if Nkind
(Init_Call
) = N_Procedure_Call_Statement
7255 and then Is_Entity_Name
(Name
(Init_Call
))
7256 and then Entity
(Name
(Init_Call
)) = Init_Proc
7265 end Find_Init_Call_In_List
;
7267 Init_Call
: Node_Id
;
7269 -- Start of processing for Find_Init_Call
7272 if Present
(Initialization_Statements
(Var
)) then
7273 Init_Call
:= Initialization_Statements
(Var
);
7274 Set_Initialization_Statements
(Var
, Empty
);
7276 elsif not Has_Non_Null_Base_Init_Proc
(Typ
) then
7278 -- No init proc for the type, so obviously no call to be found
7283 -- We might be able to handle other cases below by just properly
7284 -- setting Initialization_Statements at the point where the init proc
7285 -- call is generated???
7287 Init_Proc
:= Base_Init_Proc
(Typ
);
7289 -- First scan the list containing the declaration of Var
7291 Init_Call
:= Find_Init_Call_In_List
(From
=> Next
(Par
));
7293 -- If not found, also look on Var's freeze actions list, if any,
7294 -- since the init call may have been moved there (case of an address
7295 -- clause applying to Var).
7297 if No
(Init_Call
) and then Present
(Freeze_Node
(Var
)) then
7299 Find_Init_Call_In_List
(First
(Actions
(Freeze_Node
(Var
))));
7302 -- If the initialization call has actuals that use the secondary
7303 -- stack, the call may have been wrapped into a temporary block, in
7304 -- which case the block itself has to be removed.
7306 if No
(Init_Call
) and then Nkind
(Next
(Par
)) = N_Block_Statement
then
7308 Blk
: constant Node_Id
:= Next
(Par
);
7311 (Find_Init_Call_In_List
7312 (First
(Statements
(Handled_Statement_Sequence
(Blk
)))))
7320 if Present
(Init_Call
) then
7324 end Remove_Init_Call
;
7326 -------------------------
7327 -- Remove_Side_Effects --
7328 -------------------------
7330 procedure Remove_Side_Effects
7332 Name_Req
: Boolean := False;
7333 Renaming_Req
: Boolean := False;
7334 Variable_Ref
: Boolean := False;
7335 Related_Id
: Entity_Id
:= Empty
;
7336 Is_Low_Bound
: Boolean := False;
7337 Is_High_Bound
: Boolean := False)
7339 function Build_Temporary
7342 Related_Nod
: Node_Id
:= Empty
) return Entity_Id
;
7343 -- Create an external symbol of the form xxx_FIRST/_LAST if Related_Nod
7344 -- is present (xxx is taken from the Chars field of Related_Nod),
7345 -- otherwise it generates an internal temporary.
7347 ---------------------
7348 -- Build_Temporary --
7349 ---------------------
7351 function Build_Temporary
7354 Related_Nod
: Node_Id
:= Empty
) return Entity_Id
7359 -- The context requires an external symbol
7361 if Present
(Related_Id
) then
7362 if Is_Low_Bound
then
7363 Temp_Nam
:= New_External_Name
(Chars
(Related_Id
), "_FIRST");
7364 else pragma Assert
(Is_High_Bound
);
7365 Temp_Nam
:= New_External_Name
(Chars
(Related_Id
), "_LAST");
7368 return Make_Defining_Identifier
(Loc
, Temp_Nam
);
7370 -- Otherwise generate an internal temporary
7373 return Make_Temporary
(Loc
, Id
, Related_Nod
);
7375 end Build_Temporary
;
7379 Loc
: constant Source_Ptr
:= Sloc
(Exp
);
7380 Exp_Type
: constant Entity_Id
:= Etype
(Exp
);
7381 Svg_Suppress
: constant Suppress_Record
:= Scope_Suppress
;
7385 Ptr_Typ_Decl
: Node_Id
;
7386 Ref_Type
: Entity_Id
;
7389 -- Start of processing for Remove_Side_Effects
7392 -- Handle cases in which there is nothing to do. In GNATprove mode,
7393 -- removal of side effects is useful for the light expansion of
7394 -- renamings. This removal should only occur when not inside a
7395 -- generic and not doing a pre-analysis.
7397 if not Expander_Active
7398 and (Inside_A_Generic
or not Full_Analysis
or not GNATprove_Mode
)
7403 -- Cannot generate temporaries if the invocation to remove side effects
7404 -- was issued too early and the type of the expression is not resolved
7405 -- (this happens because routines Duplicate_Subexpr_XX implicitly invoke
7406 -- Remove_Side_Effects).
7408 if No
(Exp_Type
) or else Ekind
(Exp_Type
) = E_Access_Attribute_Type
then
7411 -- No action needed for side-effect free expressions
7413 elsif Side_Effect_Free
(Exp
, Name_Req
, Variable_Ref
) then
7417 -- The remaining procesaing is done with all checks suppressed
7419 -- Note: from now on, don't use return statements, instead do a goto
7420 -- Leave, to ensure that we properly restore Scope_Suppress.Suppress.
7422 Scope_Suppress
.Suppress
:= (others => True);
7424 -- If it is a scalar type and we need to capture the value, just make
7425 -- a copy. Likewise for a function call, an attribute reference, a
7426 -- conditional expression, an allocator, or an operator. And if we have
7427 -- a volatile reference and Name_Req is not set (see comments for
7428 -- Side_Effect_Free).
7430 if Is_Elementary_Type
(Exp_Type
)
7432 -- Note: this test is rather mysterious??? Why can't we just test ONLY
7433 -- Is_Elementary_Type and be done with it. If we try that approach, we
7434 -- get some failures (infinite recursions) from the Duplicate_Subexpr
7435 -- call at the end of Checks.Apply_Predicate_Check. To be
7438 and then (Variable_Ref
7439 or else Nkind_In
(Exp
, N_Attribute_Reference
,
7444 or else Nkind
(Exp
) in N_Op
7445 or else (not Name_Req
7446 and then Is_Volatile_Reference
(Exp
)))
7448 Def_Id
:= Build_Temporary
(Loc
, 'R', Exp
);
7449 Set_Etype
(Def_Id
, Exp_Type
);
7450 Res
:= New_Occurrence_Of
(Def_Id
, Loc
);
7452 -- If the expression is a packed reference, it must be reanalyzed and
7453 -- expanded, depending on context. This is the case for actuals where
7454 -- a constraint check may capture the actual before expansion of the
7455 -- call is complete.
7457 if Nkind
(Exp
) = N_Indexed_Component
7458 and then Is_Packed
(Etype
(Prefix
(Exp
)))
7460 Set_Analyzed
(Exp
, False);
7461 Set_Analyzed
(Prefix
(Exp
), False);
7465 -- Rnn : Exp_Type renames Expr;
7467 if Renaming_Req
then
7469 Make_Object_Renaming_Declaration
(Loc
,
7470 Defining_Identifier
=> Def_Id
,
7471 Subtype_Mark
=> New_Occurrence_Of
(Exp_Type
, Loc
),
7472 Name
=> Relocate_Node
(Exp
));
7475 -- Rnn : constant Exp_Type := Expr;
7479 Make_Object_Declaration
(Loc
,
7480 Defining_Identifier
=> Def_Id
,
7481 Object_Definition
=> New_Occurrence_Of
(Exp_Type
, Loc
),
7482 Constant_Present
=> True,
7483 Expression
=> Relocate_Node
(Exp
));
7485 Set_Assignment_OK
(E
);
7488 Insert_Action
(Exp
, E
);
7490 -- If the expression has the form v.all then we can just capture the
7491 -- pointer, and then do an explicit dereference on the result, but
7492 -- this is not right if this is a volatile reference.
7494 elsif Nkind
(Exp
) = N_Explicit_Dereference
7495 and then not Is_Volatile_Reference
(Exp
)
7497 Def_Id
:= Build_Temporary
(Loc
, 'R', Exp
);
7499 Make_Explicit_Dereference
(Loc
, New_Occurrence_Of
(Def_Id
, Loc
));
7502 Make_Object_Declaration
(Loc
,
7503 Defining_Identifier
=> Def_Id
,
7504 Object_Definition
=>
7505 New_Occurrence_Of
(Etype
(Prefix
(Exp
)), Loc
),
7506 Constant_Present
=> True,
7507 Expression
=> Relocate_Node
(Prefix
(Exp
))));
7509 -- Similar processing for an unchecked conversion of an expression of
7510 -- the form v.all, where we want the same kind of treatment.
7512 elsif Nkind
(Exp
) = N_Unchecked_Type_Conversion
7513 and then Nkind
(Expression
(Exp
)) = N_Explicit_Dereference
7515 Remove_Side_Effects
(Expression
(Exp
), Name_Req
, Variable_Ref
);
7518 -- If this is a type conversion, leave the type conversion and remove
7519 -- the side effects in the expression. This is important in several
7520 -- circumstances: for change of representations, and also when this is a
7521 -- view conversion to a smaller object, where gigi can end up creating
7522 -- its own temporary of the wrong size.
7524 elsif Nkind
(Exp
) = N_Type_Conversion
then
7525 Remove_Side_Effects
(Expression
(Exp
), Name_Req
, Variable_Ref
);
7528 -- If this is an unchecked conversion that Gigi can't handle, make
7529 -- a copy or a use a renaming to capture the value.
7531 elsif Nkind
(Exp
) = N_Unchecked_Type_Conversion
7532 and then not Safe_Unchecked_Type_Conversion
(Exp
)
7534 if CW_Or_Has_Controlled_Part
(Exp_Type
) then
7536 -- Use a renaming to capture the expression, rather than create
7537 -- a controlled temporary.
7539 Def_Id
:= Build_Temporary
(Loc
, 'R', Exp
);
7540 Res
:= New_Occurrence_Of
(Def_Id
, Loc
);
7543 Make_Object_Renaming_Declaration
(Loc
,
7544 Defining_Identifier
=> Def_Id
,
7545 Subtype_Mark
=> New_Occurrence_Of
(Exp_Type
, Loc
),
7546 Name
=> Relocate_Node
(Exp
)));
7549 Def_Id
:= Build_Temporary
(Loc
, 'R', Exp
);
7550 Set_Etype
(Def_Id
, Exp_Type
);
7551 Res
:= New_Occurrence_Of
(Def_Id
, Loc
);
7554 Make_Object_Declaration
(Loc
,
7555 Defining_Identifier
=> Def_Id
,
7556 Object_Definition
=> New_Occurrence_Of
(Exp_Type
, Loc
),
7557 Constant_Present
=> not Is_Variable
(Exp
),
7558 Expression
=> Relocate_Node
(Exp
));
7560 Set_Assignment_OK
(E
);
7561 Insert_Action
(Exp
, E
);
7564 -- For expressions that denote objects, we can use a renaming scheme.
7565 -- This is needed for correctness in the case of a volatile object of
7566 -- a non-volatile type because the Make_Reference call of the "default"
7567 -- approach would generate an illegal access value (an access value
7568 -- cannot designate such an object - see Analyze_Reference).
7570 elsif Is_Object_Reference
(Exp
)
7571 and then Nkind
(Exp
) /= N_Function_Call
7573 -- In Ada 2012 a qualified expression is an object, but for purposes
7574 -- of removing side effects it still need to be transformed into a
7575 -- separate declaration, particularly in the case of an aggregate.
7577 and then Nkind
(Exp
) /= N_Qualified_Expression
7579 -- We skip using this scheme if we have an object of a volatile
7580 -- type and we do not have Name_Req set true (see comments for
7581 -- Side_Effect_Free).
7583 and then (Name_Req
or else not Treat_As_Volatile
(Exp_Type
))
7585 Def_Id
:= Build_Temporary
(Loc
, 'R', Exp
);
7587 if Nkind
(Exp
) = N_Selected_Component
7588 and then Nkind
(Prefix
(Exp
)) = N_Function_Call
7589 and then Is_Array_Type
(Exp_Type
)
7591 -- Avoid generating a variable-sized temporary, by generating
7592 -- the renaming declaration just for the function call. The
7593 -- transformation could be refined to apply only when the array
7594 -- component is constrained by a discriminant???
7597 Make_Selected_Component
(Loc
,
7598 Prefix
=> New_Occurrence_Of
(Def_Id
, Loc
),
7599 Selector_Name
=> Selector_Name
(Exp
));
7602 Make_Object_Renaming_Declaration
(Loc
,
7603 Defining_Identifier
=> Def_Id
,
7605 New_Occurrence_Of
(Base_Type
(Etype
(Prefix
(Exp
))), Loc
),
7606 Name
=> Relocate_Node
(Prefix
(Exp
))));
7609 Res
:= New_Occurrence_Of
(Def_Id
, Loc
);
7612 Make_Object_Renaming_Declaration
(Loc
,
7613 Defining_Identifier
=> Def_Id
,
7614 Subtype_Mark
=> New_Occurrence_Of
(Exp_Type
, Loc
),
7615 Name
=> Relocate_Node
(Exp
)));
7618 -- If this is a packed reference, or a selected component with
7619 -- a non-standard representation, a reference to the temporary
7620 -- will be replaced by a copy of the original expression (see
7621 -- Exp_Ch2.Expand_Renaming). Otherwise the temporary must be
7622 -- elaborated by gigi, and is of course not to be replaced in-line
7623 -- by the expression it renames, which would defeat the purpose of
7624 -- removing the side-effect.
7626 if Nkind_In
(Exp
, N_Selected_Component
, N_Indexed_Component
)
7627 and then Has_Non_Standard_Rep
(Etype
(Prefix
(Exp
)))
7631 Set_Is_Renaming_Of_Object
(Def_Id
, False);
7634 -- Otherwise we generate a reference to the value
7637 -- An expression which is in SPARK mode is considered side effect
7638 -- free if the resulting value is captured by a variable or a
7642 and then Nkind
(Parent
(Exp
)) = N_Object_Declaration
7647 -- Special processing for function calls that return a limited type.
7648 -- We need to build a declaration that will enable build-in-place
7649 -- expansion of the call. This is not done if the context is already
7650 -- an object declaration, to prevent infinite recursion.
7652 -- This is relevant only in Ada 2005 mode. In Ada 95 programs we have
7653 -- to accommodate functions returning limited objects by reference.
7655 if Ada_Version
>= Ada_2005
7656 and then Nkind
(Exp
) = N_Function_Call
7657 and then Is_Limited_View
(Etype
(Exp
))
7658 and then Nkind
(Parent
(Exp
)) /= N_Object_Declaration
7661 Obj
: constant Entity_Id
:= Make_Temporary
(Loc
, 'F', Exp
);
7666 Make_Object_Declaration
(Loc
,
7667 Defining_Identifier
=> Obj
,
7668 Object_Definition
=> New_Occurrence_Of
(Exp_Type
, Loc
),
7669 Expression
=> Relocate_Node
(Exp
));
7671 Insert_Action
(Exp
, Decl
);
7672 Set_Etype
(Obj
, Exp_Type
);
7673 Rewrite
(Exp
, New_Occurrence_Of
(Obj
, Loc
));
7678 Def_Id
:= Build_Temporary
(Loc
, 'R', Exp
);
7680 -- The regular expansion of functions with side effects involves the
7681 -- generation of an access type to capture the return value found on
7682 -- the secondary stack. Since SPARK (and why) cannot process access
7683 -- types, use a different approach which ignores the secondary stack
7684 -- and "copies" the returned object.
7686 if GNATprove_Mode
then
7687 Res
:= New_Occurrence_Of
(Def_Id
, Loc
);
7688 Ref_Type
:= Exp_Type
;
7690 -- Regular expansion utilizing an access type and 'reference
7694 Make_Explicit_Dereference
(Loc
,
7695 Prefix
=> New_Occurrence_Of
(Def_Id
, Loc
));
7698 -- type Ann is access all <Exp_Type>;
7700 Ref_Type
:= Make_Temporary
(Loc
, 'A');
7703 Make_Full_Type_Declaration
(Loc
,
7704 Defining_Identifier
=> Ref_Type
,
7706 Make_Access_To_Object_Definition
(Loc
,
7707 All_Present
=> True,
7708 Subtype_Indication
=>
7709 New_Occurrence_Of
(Exp_Type
, Loc
)));
7711 Insert_Action
(Exp
, Ptr_Typ_Decl
);
7715 if Nkind
(E
) = N_Explicit_Dereference
then
7716 New_Exp
:= Relocate_Node
(Prefix
(E
));
7719 E
:= Relocate_Node
(E
);
7721 -- Do not generate a 'reference in SPARK mode since the access
7722 -- type is not created in the first place.
7724 if GNATprove_Mode
then
7727 -- Otherwise generate reference, marking the value as non-null
7728 -- since we know it cannot be null and we don't want a check.
7731 New_Exp
:= Make_Reference
(Loc
, E
);
7732 Set_Is_Known_Non_Null
(Def_Id
);
7736 if Is_Delayed_Aggregate
(E
) then
7738 -- The expansion of nested aggregates is delayed until the
7739 -- enclosing aggregate is expanded. As aggregates are often
7740 -- qualified, the predicate applies to qualified expressions as
7741 -- well, indicating that the enclosing aggregate has not been
7742 -- expanded yet. At this point the aggregate is part of a
7743 -- stand-alone declaration, and must be fully expanded.
7745 if Nkind
(E
) = N_Qualified_Expression
then
7746 Set_Expansion_Delayed
(Expression
(E
), False);
7747 Set_Analyzed
(Expression
(E
), False);
7749 Set_Expansion_Delayed
(E
, False);
7752 Set_Analyzed
(E
, False);
7756 Make_Object_Declaration
(Loc
,
7757 Defining_Identifier
=> Def_Id
,
7758 Object_Definition
=> New_Occurrence_Of
(Ref_Type
, Loc
),
7759 Constant_Present
=> True,
7760 Expression
=> New_Exp
));
7763 -- Preserve the Assignment_OK flag in all copies, since at least one
7764 -- copy may be used in a context where this flag must be set (otherwise
7765 -- why would the flag be set in the first place).
7767 Set_Assignment_OK
(Res
, Assignment_OK
(Exp
));
7769 -- Finally rewrite the original expression and we are done
7772 Analyze_And_Resolve
(Exp
, Exp_Type
);
7775 Scope_Suppress
:= Svg_Suppress
;
7776 end Remove_Side_Effects
;
7778 ---------------------------
7779 -- Represented_As_Scalar --
7780 ---------------------------
7782 function Represented_As_Scalar
(T
: Entity_Id
) return Boolean is
7783 UT
: constant Entity_Id
:= Underlying_Type
(T
);
7785 return Is_Scalar_Type
(UT
)
7786 or else (Is_Bit_Packed_Array
(UT
)
7787 and then Is_Scalar_Type
(Packed_Array_Impl_Type
(UT
)));
7788 end Represented_As_Scalar
;
7790 ------------------------------
7791 -- Requires_Cleanup_Actions --
7792 ------------------------------
7794 function Requires_Cleanup_Actions
7796 Lib_Level
: Boolean) return Boolean
7798 At_Lib_Level
: constant Boolean :=
7800 and then Nkind_In
(N
, N_Package_Body
,
7801 N_Package_Specification
);
7802 -- N is at the library level if the top-most context is a package and
7803 -- the path taken to reach N does not inlcude non-package constructs.
7807 when N_Accept_Statement |
7815 Requires_Cleanup_Actions
(Declarations
(N
), At_Lib_Level
, True)
7817 (Present
(Handled_Statement_Sequence
(N
))
7819 Requires_Cleanup_Actions
7820 (Statements
(Handled_Statement_Sequence
(N
)),
7821 At_Lib_Level
, True));
7823 when N_Package_Specification
=>
7825 Requires_Cleanup_Actions
7826 (Visible_Declarations
(N
), At_Lib_Level
, True)
7828 Requires_Cleanup_Actions
7829 (Private_Declarations
(N
), At_Lib_Level
, True);
7834 end Requires_Cleanup_Actions
;
7836 ------------------------------
7837 -- Requires_Cleanup_Actions --
7838 ------------------------------
7840 function Requires_Cleanup_Actions
7842 Lib_Level
: Boolean;
7843 Nested_Constructs
: Boolean) return Boolean
7848 Obj_Typ
: Entity_Id
;
7849 Pack_Id
: Entity_Id
;
7854 or else Is_Empty_List
(L
)
7860 while Present
(Decl
) loop
7862 -- Library-level tagged types
7864 if Nkind
(Decl
) = N_Full_Type_Declaration
then
7865 Typ
:= Defining_Identifier
(Decl
);
7867 -- Ignored Ghost types do not need any cleanup actions because
7868 -- they will not appear in the final tree.
7870 if Is_Ignored_Ghost_Entity
(Typ
) then
7873 elsif Is_Tagged_Type
(Typ
)
7874 and then Is_Library_Level_Entity
(Typ
)
7875 and then Convention
(Typ
) = Convention_Ada
7876 and then Present
(Access_Disp_Table
(Typ
))
7877 and then RTE_Available
(RE_Unregister_Tag
)
7878 and then not Is_Abstract_Type
(Typ
)
7879 and then not No_Run_Time_Mode
7884 -- Regular object declarations
7886 elsif Nkind
(Decl
) = N_Object_Declaration
then
7887 Obj_Id
:= Defining_Identifier
(Decl
);
7888 Obj_Typ
:= Base_Type
(Etype
(Obj_Id
));
7889 Expr
:= Expression
(Decl
);
7891 -- Bypass any form of processing for objects which have their
7892 -- finalization disabled. This applies only to objects at the
7895 if Lib_Level
and then Finalize_Storage_Only
(Obj_Typ
) then
7898 -- Transient variables are treated separately in order to minimize
7899 -- the size of the generated code. See Exp_Ch7.Process_Transient_
7902 elsif Is_Processed_Transient
(Obj_Id
) then
7905 -- Ignored Ghost objects do not need any cleanup actions because
7906 -- they will not appear in the final tree.
7908 elsif Is_Ignored_Ghost_Entity
(Obj_Id
) then
7911 -- The object is of the form:
7912 -- Obj : Typ [:= Expr];
7914 -- Do not process the incomplete view of a deferred constant. Do
7915 -- not consider tag-to-class-wide conversions.
7917 elsif not Is_Imported
(Obj_Id
)
7918 and then Needs_Finalization
(Obj_Typ
)
7919 and then not (Ekind
(Obj_Id
) = E_Constant
7920 and then not Has_Completion
(Obj_Id
))
7921 and then not Is_Tag_To_Class_Wide_Conversion
(Obj_Id
)
7925 -- The object is of the form:
7926 -- Obj : Access_Typ := Non_BIP_Function_Call'reference;
7928 -- Obj : Access_Typ :=
7929 -- BIP_Function_Call (BIPalloc => 2, ...)'reference;
7931 elsif Is_Access_Type
(Obj_Typ
)
7932 and then Needs_Finalization
7933 (Available_View
(Designated_Type
(Obj_Typ
)))
7934 and then Present
(Expr
)
7936 (Is_Secondary_Stack_BIP_Func_Call
(Expr
)
7938 (Is_Non_BIP_Func_Call
(Expr
)
7939 and then not Is_Related_To_Func_Return
(Obj_Id
)))
7943 -- Processing for "hook" objects generated for controlled
7944 -- transients declared inside an Expression_With_Actions.
7946 elsif Is_Access_Type
(Obj_Typ
)
7947 and then Present
(Status_Flag_Or_Transient_Decl
(Obj_Id
))
7948 and then Nkind
(Status_Flag_Or_Transient_Decl
(Obj_Id
)) =
7949 N_Object_Declaration
7953 -- Processing for intermediate results of if expressions where
7954 -- one of the alternatives uses a controlled function call.
7956 elsif Is_Access_Type
(Obj_Typ
)
7957 and then Present
(Status_Flag_Or_Transient_Decl
(Obj_Id
))
7958 and then Nkind
(Status_Flag_Or_Transient_Decl
(Obj_Id
)) =
7959 N_Defining_Identifier
7960 and then Present
(Expr
)
7961 and then Nkind
(Expr
) = N_Null
7965 -- Simple protected objects which use type System.Tasking.
7966 -- Protected_Objects.Protection to manage their locks should be
7967 -- treated as controlled since they require manual cleanup.
7969 elsif Ekind
(Obj_Id
) = E_Variable
7970 and then (Is_Simple_Protected_Type
(Obj_Typ
)
7971 or else Has_Simple_Protected_Object
(Obj_Typ
))
7976 -- Specific cases of object renamings
7978 elsif Nkind
(Decl
) = N_Object_Renaming_Declaration
then
7979 Obj_Id
:= Defining_Identifier
(Decl
);
7980 Obj_Typ
:= Base_Type
(Etype
(Obj_Id
));
7982 -- Bypass any form of processing for objects which have their
7983 -- finalization disabled. This applies only to objects at the
7986 if Lib_Level
and then Finalize_Storage_Only
(Obj_Typ
) then
7989 -- Ignored Ghost object renamings do not need any cleanup actions
7990 -- because they will not appear in the final tree.
7992 elsif Is_Ignored_Ghost_Entity
(Obj_Id
) then
7995 -- Return object of a build-in-place function. This case is
7996 -- recognized and marked by the expansion of an extended return
7997 -- statement (see Expand_N_Extended_Return_Statement).
7999 elsif Needs_Finalization
(Obj_Typ
)
8000 and then Is_Return_Object
(Obj_Id
)
8001 and then Present
(Status_Flag_Or_Transient_Decl
(Obj_Id
))
8005 -- Detect a case where a source object has been initialized by
8006 -- a controlled function call or another object which was later
8007 -- rewritten as a class-wide conversion of Ada.Tags.Displace.
8009 -- Obj1 : CW_Type := Src_Obj;
8010 -- Obj2 : CW_Type := Function_Call (...);
8012 -- Obj1 : CW_Type renames (... Ada.Tags.Displace (Src_Obj));
8013 -- Tmp : ... := Function_Call (...)'reference;
8014 -- Obj2 : CW_Type renames (... Ada.Tags.Displace (Tmp));
8016 elsif Is_Displacement_Of_Object_Or_Function_Result
(Obj_Id
) then
8020 -- Inspect the freeze node of an access-to-controlled type and look
8021 -- for a delayed finalization master. This case arises when the
8022 -- freeze actions are inserted at a later time than the expansion of
8023 -- the context. Since Build_Finalizer is never called on a single
8024 -- construct twice, the master will be ultimately left out and never
8025 -- finalized. This is also needed for freeze actions of designated
8026 -- types themselves, since in some cases the finalization master is
8027 -- associated with a designated type's freeze node rather than that
8028 -- of the access type (see handling for freeze actions in
8029 -- Build_Finalization_Master).
8031 elsif Nkind
(Decl
) = N_Freeze_Entity
8032 and then Present
(Actions
(Decl
))
8034 Typ
:= Entity
(Decl
);
8036 -- Freeze nodes for ignored Ghost types do not need cleanup
8037 -- actions because they will never appear in the final tree.
8039 if Is_Ignored_Ghost_Entity
(Typ
) then
8042 elsif ((Is_Access_Type
(Typ
)
8043 and then not Is_Access_Subprogram_Type
(Typ
)
8044 and then Needs_Finalization
8045 (Available_View
(Designated_Type
(Typ
))))
8046 or else (Is_Type
(Typ
) and then Needs_Finalization
(Typ
)))
8047 and then Requires_Cleanup_Actions
8048 (Actions
(Decl
), Lib_Level
, Nested_Constructs
)
8053 -- Nested package declarations
8055 elsif Nested_Constructs
8056 and then Nkind
(Decl
) = N_Package_Declaration
8058 Pack_Id
:= Defining_Entity
(Decl
);
8060 -- Do not inspect an ignored Ghost package because all code found
8061 -- within will not appear in the final tree.
8063 if Is_Ignored_Ghost_Entity
(Pack_Id
) then
8066 elsif Ekind
(Pack_Id
) /= E_Generic_Package
8067 and then Requires_Cleanup_Actions
8068 (Specification
(Decl
), Lib_Level
)
8073 -- Nested package bodies
8075 elsif Nested_Constructs
and then Nkind
(Decl
) = N_Package_Body
then
8077 -- Do not inspect an ignored Ghost package body because all code
8078 -- found within will not appear in the final tree.
8080 if Is_Ignored_Ghost_Entity
(Defining_Entity
(Decl
)) then
8083 elsif Ekind
(Corresponding_Spec
(Decl
)) /= E_Generic_Package
8084 and then Requires_Cleanup_Actions
(Decl
, Lib_Level
)
8089 elsif Nkind
(Decl
) = N_Block_Statement
8092 -- Handle a rare case caused by a controlled transient variable
8093 -- created as part of a record init proc. The variable is wrapped
8094 -- in a block, but the block is not associated with a transient
8099 -- Handle the case where the original context has been wrapped in
8100 -- a block to avoid interference between exception handlers and
8101 -- At_End handlers. Treat the block as transparent and process its
8104 or else Is_Finalization_Wrapper
(Decl
))
8106 if Requires_Cleanup_Actions
(Decl
, Lib_Level
) then
8115 end Requires_Cleanup_Actions
;
8117 ------------------------------------
8118 -- Safe_Unchecked_Type_Conversion --
8119 ------------------------------------
8121 -- Note: this function knows quite a bit about the exact requirements of
8122 -- Gigi with respect to unchecked type conversions, and its code must be
8123 -- coordinated with any changes in Gigi in this area.
8125 -- The above requirements should be documented in Sinfo ???
8127 function Safe_Unchecked_Type_Conversion
(Exp
: Node_Id
) return Boolean is
8132 Pexp
: constant Node_Id
:= Parent
(Exp
);
8135 -- If the expression is the RHS of an assignment or object declaration
8136 -- we are always OK because there will always be a target.
8138 -- Object renaming declarations, (generated for view conversions of
8139 -- actuals in inlined calls), like object declarations, provide an
8140 -- explicit type, and are safe as well.
8142 if (Nkind
(Pexp
) = N_Assignment_Statement
8143 and then Expression
(Pexp
) = Exp
)
8144 or else Nkind_In
(Pexp
, N_Object_Declaration
,
8145 N_Object_Renaming_Declaration
)
8149 -- If the expression is the prefix of an N_Selected_Component we should
8150 -- also be OK because GCC knows to look inside the conversion except if
8151 -- the type is discriminated. We assume that we are OK anyway if the
8152 -- type is not set yet or if it is controlled since we can't afford to
8153 -- introduce a temporary in this case.
8155 elsif Nkind
(Pexp
) = N_Selected_Component
8156 and then Prefix
(Pexp
) = Exp
8158 if No
(Etype
(Pexp
)) then
8162 not Has_Discriminants
(Etype
(Pexp
))
8163 or else Is_Constrained
(Etype
(Pexp
));
8167 -- Set the output type, this comes from Etype if it is set, otherwise we
8168 -- take it from the subtype mark, which we assume was already fully
8171 if Present
(Etype
(Exp
)) then
8172 Otyp
:= Etype
(Exp
);
8174 Otyp
:= Entity
(Subtype_Mark
(Exp
));
8177 -- The input type always comes from the expression, and we assume
8178 -- this is indeed always analyzed, so we can simply get the Etype.
8180 Ityp
:= Etype
(Expression
(Exp
));
8182 -- Initialize alignments to unknown so far
8187 -- Replace a concurrent type by its corresponding record type and each
8188 -- type by its underlying type and do the tests on those. The original
8189 -- type may be a private type whose completion is a concurrent type, so
8190 -- find the underlying type first.
8192 if Present
(Underlying_Type
(Otyp
)) then
8193 Otyp
:= Underlying_Type
(Otyp
);
8196 if Present
(Underlying_Type
(Ityp
)) then
8197 Ityp
:= Underlying_Type
(Ityp
);
8200 if Is_Concurrent_Type
(Otyp
) then
8201 Otyp
:= Corresponding_Record_Type
(Otyp
);
8204 if Is_Concurrent_Type
(Ityp
) then
8205 Ityp
:= Corresponding_Record_Type
(Ityp
);
8208 -- If the base types are the same, we know there is no problem since
8209 -- this conversion will be a noop.
8211 if Implementation_Base_Type
(Otyp
) = Implementation_Base_Type
(Ityp
) then
8214 -- Same if this is an upwards conversion of an untagged type, and there
8215 -- are no constraints involved (could be more general???)
8217 elsif Etype
(Ityp
) = Otyp
8218 and then not Is_Tagged_Type
(Ityp
)
8219 and then not Has_Discriminants
(Ityp
)
8220 and then No
(First_Rep_Item
(Base_Type
(Ityp
)))
8224 -- If the expression has an access type (object or subprogram) we assume
8225 -- that the conversion is safe, because the size of the target is safe,
8226 -- even if it is a record (which might be treated as having unknown size
8229 elsif Is_Access_Type
(Ityp
) then
8232 -- If the size of output type is known at compile time, there is never
8233 -- a problem. Note that unconstrained records are considered to be of
8234 -- known size, but we can't consider them that way here, because we are
8235 -- talking about the actual size of the object.
8237 -- We also make sure that in addition to the size being known, we do not
8238 -- have a case which might generate an embarrassingly large temp in
8239 -- stack checking mode.
8241 elsif Size_Known_At_Compile_Time
(Otyp
)
8243 (not Stack_Checking_Enabled
8244 or else not May_Generate_Large_Temp
(Otyp
))
8245 and then not (Is_Record_Type
(Otyp
) and then not Is_Constrained
(Otyp
))
8249 -- If either type is tagged, then we know the alignment is OK so
8250 -- Gigi will be able to use pointer punning.
8252 elsif Is_Tagged_Type
(Otyp
) or else Is_Tagged_Type
(Ityp
) then
8255 -- If either type is a limited record type, we cannot do a copy, so say
8256 -- safe since there's nothing else we can do.
8258 elsif Is_Limited_Record
(Otyp
) or else Is_Limited_Record
(Ityp
) then
8261 -- Conversions to and from packed array types are always ignored and
8264 elsif Is_Packed_Array_Impl_Type
(Otyp
)
8265 or else Is_Packed_Array_Impl_Type
(Ityp
)
8270 -- The only other cases known to be safe is if the input type's
8271 -- alignment is known to be at least the maximum alignment for the
8272 -- target or if both alignments are known and the output type's
8273 -- alignment is no stricter than the input's. We can use the component
8274 -- type alignement for an array if a type is an unpacked array type.
8276 if Present
(Alignment_Clause
(Otyp
)) then
8277 Oalign
:= Expr_Value
(Expression
(Alignment_Clause
(Otyp
)));
8279 elsif Is_Array_Type
(Otyp
)
8280 and then Present
(Alignment_Clause
(Component_Type
(Otyp
)))
8282 Oalign
:= Expr_Value
(Expression
(Alignment_Clause
8283 (Component_Type
(Otyp
))));
8286 if Present
(Alignment_Clause
(Ityp
)) then
8287 Ialign
:= Expr_Value
(Expression
(Alignment_Clause
(Ityp
)));
8289 elsif Is_Array_Type
(Ityp
)
8290 and then Present
(Alignment_Clause
(Component_Type
(Ityp
)))
8292 Ialign
:= Expr_Value
(Expression
(Alignment_Clause
8293 (Component_Type
(Ityp
))));
8296 if Ialign
/= No_Uint
and then Ialign
> Maximum_Alignment
then
8299 elsif Ialign
/= No_Uint
8300 and then Oalign
/= No_Uint
8301 and then Ialign
<= Oalign
8305 -- Otherwise, Gigi cannot handle this and we must make a temporary
8310 end Safe_Unchecked_Type_Conversion
;
8312 ---------------------------------
8313 -- Set_Current_Value_Condition --
8314 ---------------------------------
8316 -- Note: the implementation of this procedure is very closely tied to the
8317 -- implementation of Get_Current_Value_Condition. Here we set required
8318 -- Current_Value fields, and in Get_Current_Value_Condition, we interpret
8319 -- them, so they must have a consistent view.
8321 procedure Set_Current_Value_Condition
(Cnode
: Node_Id
) is
8323 procedure Set_Entity_Current_Value
(N
: Node_Id
);
8324 -- If N is an entity reference, where the entity is of an appropriate
8325 -- kind, then set the current value of this entity to Cnode, unless
8326 -- there is already a definite value set there.
8328 procedure Set_Expression_Current_Value
(N
: Node_Id
);
8329 -- If N is of an appropriate form, sets an appropriate entry in current
8330 -- value fields of relevant entities. Multiple entities can be affected
8331 -- in the case of an AND or AND THEN.
8333 ------------------------------
8334 -- Set_Entity_Current_Value --
8335 ------------------------------
8337 procedure Set_Entity_Current_Value
(N
: Node_Id
) is
8339 if Is_Entity_Name
(N
) then
8341 Ent
: constant Entity_Id
:= Entity
(N
);
8344 -- Don't capture if not safe to do so
8346 if not Safe_To_Capture_Value
(N
, Ent
, Cond
=> True) then
8350 -- Here we have a case where the Current_Value field may need
8351 -- to be set. We set it if it is not already set to a compile
8352 -- time expression value.
8354 -- Note that this represents a decision that one condition
8355 -- blots out another previous one. That's certainly right if
8356 -- they occur at the same level. If the second one is nested,
8357 -- then the decision is neither right nor wrong (it would be
8358 -- equally OK to leave the outer one in place, or take the new
8359 -- inner one. Really we should record both, but our data
8360 -- structures are not that elaborate.
8362 if Nkind
(Current_Value
(Ent
)) not in N_Subexpr
then
8363 Set_Current_Value
(Ent
, Cnode
);
8367 end Set_Entity_Current_Value
;
8369 ----------------------------------
8370 -- Set_Expression_Current_Value --
8371 ----------------------------------
8373 procedure Set_Expression_Current_Value
(N
: Node_Id
) is
8379 -- Loop to deal with (ignore for now) any NOT operators present. The
8380 -- presence of NOT operators will be handled properly when we call
8381 -- Get_Current_Value_Condition.
8383 while Nkind
(Cond
) = N_Op_Not
loop
8384 Cond
:= Right_Opnd
(Cond
);
8387 -- For an AND or AND THEN, recursively process operands
8389 if Nkind
(Cond
) = N_Op_And
or else Nkind
(Cond
) = N_And_Then
then
8390 Set_Expression_Current_Value
(Left_Opnd
(Cond
));
8391 Set_Expression_Current_Value
(Right_Opnd
(Cond
));
8395 -- Check possible relational operator
8397 if Nkind
(Cond
) in N_Op_Compare
then
8398 if Compile_Time_Known_Value
(Right_Opnd
(Cond
)) then
8399 Set_Entity_Current_Value
(Left_Opnd
(Cond
));
8400 elsif Compile_Time_Known_Value
(Left_Opnd
(Cond
)) then
8401 Set_Entity_Current_Value
(Right_Opnd
(Cond
));
8404 elsif Nkind_In
(Cond
,
8406 N_Qualified_Expression
,
8407 N_Expression_With_Actions
)
8409 Set_Expression_Current_Value
(Expression
(Cond
));
8411 -- Check possible boolean variable reference
8414 Set_Entity_Current_Value
(Cond
);
8416 end Set_Expression_Current_Value
;
8418 -- Start of processing for Set_Current_Value_Condition
8421 Set_Expression_Current_Value
(Condition
(Cnode
));
8422 end Set_Current_Value_Condition
;
8424 --------------------------
8425 -- Set_Elaboration_Flag --
8426 --------------------------
8428 procedure Set_Elaboration_Flag
(N
: Node_Id
; Spec_Id
: Entity_Id
) is
8429 Loc
: constant Source_Ptr
:= Sloc
(N
);
8430 Ent
: constant Entity_Id
:= Elaboration_Entity
(Spec_Id
);
8434 if Present
(Ent
) then
8436 -- Nothing to do if at the compilation unit level, because in this
8437 -- case the flag is set by the binder generated elaboration routine.
8439 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
8442 -- Here we do need to generate an assignment statement
8445 Check_Restriction
(No_Elaboration_Code
, N
);
8447 Make_Assignment_Statement
(Loc
,
8448 Name
=> New_Occurrence_Of
(Ent
, Loc
),
8449 Expression
=> Make_Integer_Literal
(Loc
, Uint_1
));
8451 if Nkind
(Parent
(N
)) = N_Subunit
then
8452 Insert_After
(Corresponding_Stub
(Parent
(N
)), Asn
);
8454 Insert_After
(N
, Asn
);
8459 -- Kill current value indication. This is necessary because the
8460 -- tests of this flag are inserted out of sequence and must not
8461 -- pick up bogus indications of the wrong constant value.
8463 Set_Current_Value
(Ent
, Empty
);
8465 -- If the subprogram is in the current declarative part and
8466 -- 'access has been applied to it, generate an elaboration
8467 -- check at the beginning of the declarations of the body.
8469 if Nkind
(N
) = N_Subprogram_Body
8470 and then Address_Taken
(Spec_Id
)
8472 Ekind_In
(Scope
(Spec_Id
), E_Block
, E_Procedure
, E_Function
)
8475 Loc
: constant Source_Ptr
:= Sloc
(N
);
8476 Decls
: constant List_Id
:= Declarations
(N
);
8480 -- No need to generate this check if first entry in the
8481 -- declaration list is a raise of Program_Error now.
8484 and then Nkind
(First
(Decls
)) = N_Raise_Program_Error
8489 -- Otherwise generate the check
8492 Make_Raise_Program_Error
(Loc
,
8495 Left_Opnd
=> New_Occurrence_Of
(Ent
, Loc
),
8496 Right_Opnd
=> Make_Integer_Literal
(Loc
, Uint_0
)),
8497 Reason
=> PE_Access_Before_Elaboration
);
8500 Set_Declarations
(N
, New_List
(Chk
));
8502 Prepend
(Chk
, Decls
);
8510 end Set_Elaboration_Flag
;
8512 ----------------------------
8513 -- Set_Renamed_Subprogram --
8514 ----------------------------
8516 procedure Set_Renamed_Subprogram
(N
: Node_Id
; E
: Entity_Id
) is
8518 -- If input node is an identifier, we can just reset it
8520 if Nkind
(N
) = N_Identifier
then
8521 Set_Chars
(N
, Chars
(E
));
8524 -- Otherwise we have to do a rewrite, preserving Comes_From_Source
8528 CS
: constant Boolean := Comes_From_Source
(N
);
8530 Rewrite
(N
, Make_Identifier
(Sloc
(N
), Chars
(E
)));
8532 Set_Comes_From_Source
(N
, CS
);
8533 Set_Analyzed
(N
, True);
8536 end Set_Renamed_Subprogram
;
8538 ----------------------
8539 -- Side_Effect_Free --
8540 ----------------------
8542 function Side_Effect_Free
8544 Name_Req
: Boolean := False;
8545 Variable_Ref
: Boolean := False) return Boolean
8547 Typ
: constant Entity_Id
:= Etype
(N
);
8548 -- Result type of the expression
8550 function Safe_Prefixed_Reference
(N
: Node_Id
) return Boolean;
8551 -- The argument N is a construct where the Prefix is dereferenced if it
8552 -- is an access type and the result is a variable. The call returns True
8553 -- if the construct is side effect free (not considering side effects in
8554 -- other than the prefix which are to be tested by the caller).
8556 function Within_In_Parameter
(N
: Node_Id
) return Boolean;
8557 -- Determines if N is a subcomponent of a composite in-parameter. If so,
8558 -- N is not side-effect free when the actual is global and modifiable
8559 -- indirectly from within a subprogram, because it may be passed by
8560 -- reference. The front-end must be conservative here and assume that
8561 -- this may happen with any array or record type. On the other hand, we
8562 -- cannot create temporaries for all expressions for which this
8563 -- condition is true, for various reasons that might require clearing up
8564 -- ??? For example, discriminant references that appear out of place, or
8565 -- spurious type errors with class-wide expressions. As a result, we
8566 -- limit the transformation to loop bounds, which is so far the only
8567 -- case that requires it.
8569 -----------------------------
8570 -- Safe_Prefixed_Reference --
8571 -----------------------------
8573 function Safe_Prefixed_Reference
(N
: Node_Id
) return Boolean is
8575 -- If prefix is not side effect free, definitely not safe
8577 if not Side_Effect_Free
(Prefix
(N
), Name_Req
, Variable_Ref
) then
8580 -- If the prefix is of an access type that is not access-to-constant,
8581 -- then this construct is a variable reference, which means it is to
8582 -- be considered to have side effects if Variable_Ref is set True.
8584 elsif Is_Access_Type
(Etype
(Prefix
(N
)))
8585 and then not Is_Access_Constant
(Etype
(Prefix
(N
)))
8586 and then Variable_Ref
8588 -- Exception is a prefix that is the result of a previous removal
8591 return Is_Entity_Name
(Prefix
(N
))
8592 and then not Comes_From_Source
(Prefix
(N
))
8593 and then Ekind
(Entity
(Prefix
(N
))) = E_Constant
8594 and then Is_Internal_Name
(Chars
(Entity
(Prefix
(N
))));
8596 -- If the prefix is an explicit dereference then this construct is a
8597 -- variable reference, which means it is to be considered to have
8598 -- side effects if Variable_Ref is True.
8600 -- We do NOT exclude dereferences of access-to-constant types because
8601 -- we handle them as constant view of variables.
8603 elsif Nkind
(Prefix
(N
)) = N_Explicit_Dereference
8604 and then Variable_Ref
8608 -- Note: The following test is the simplest way of solving a complex
8609 -- problem uncovered by the following test (Side effect on loop bound
8610 -- that is a subcomponent of a global variable:
8612 -- with Text_Io; use Text_Io;
8613 -- procedure Tloop is
8616 -- V : Natural := 4;
8617 -- S : String (1..5) := (others => 'a');
8624 -- with procedure Action;
8625 -- procedure Loop_G (Arg : X; Msg : String)
8627 -- procedure Loop_G (Arg : X; Msg : String) is
8629 -- Put_Line ("begin loop_g " & Msg & " will loop till: "
8630 -- & Natural'Image (Arg.V));
8631 -- for Index in 1 .. Arg.V loop
8633 -- (Natural'Image (Index) & " " & Arg.S (Index));
8634 -- if Index > 2 then
8638 -- Put_Line ("end loop_g " & Msg);
8641 -- procedure Loop1 is new Loop_G (Modi);
8642 -- procedure Modi is
8645 -- Loop1 (X1, "from modi");
8649 -- Loop1 (X1, "initial");
8652 -- The output of the above program should be:
8654 -- begin loop_g initial will loop till: 4
8658 -- begin loop_g from modi will loop till: 1
8660 -- end loop_g from modi
8662 -- begin loop_g from modi will loop till: 1
8664 -- end loop_g from modi
8665 -- end loop_g initial
8667 -- If a loop bound is a subcomponent of a global variable, a
8668 -- modification of that variable within the loop may incorrectly
8669 -- affect the execution of the loop.
8671 elsif Nkind
(Parent
(Parent
(N
))) = N_Loop_Parameter_Specification
8672 and then Within_In_Parameter
(Prefix
(N
))
8673 and then Variable_Ref
8677 -- All other cases are side effect free
8682 end Safe_Prefixed_Reference
;
8684 -------------------------
8685 -- Within_In_Parameter --
8686 -------------------------
8688 function Within_In_Parameter
(N
: Node_Id
) return Boolean is
8690 if not Comes_From_Source
(N
) then
8693 elsif Is_Entity_Name
(N
) then
8694 return Ekind
(Entity
(N
)) = E_In_Parameter
;
8696 elsif Nkind_In
(N
, N_Indexed_Component
, N_Selected_Component
) then
8697 return Within_In_Parameter
(Prefix
(N
));
8702 end Within_In_Parameter
;
8704 -- Start of processing for Side_Effect_Free
8707 -- If volatile reference, always consider it to have side effects
8709 if Is_Volatile_Reference
(N
) then
8713 -- Note on checks that could raise Constraint_Error. Strictly, if we
8714 -- take advantage of 11.6, these checks do not count as side effects.
8715 -- However, we would prefer to consider that they are side effects,
8716 -- since the backend CSE does not work very well on expressions which
8717 -- can raise Constraint_Error. On the other hand if we don't consider
8718 -- them to be side effect free, then we get some awkward expansions
8719 -- in -gnato mode, resulting in code insertions at a point where we
8720 -- do not have a clear model for performing the insertions.
8722 -- Special handling for entity names
8724 if Is_Entity_Name
(N
) then
8726 -- A type reference is always side effect free
8728 if Is_Type
(Entity
(N
)) then
8731 -- Variables are considered to be a side effect if Variable_Ref
8732 -- is set or if we have a volatile reference and Name_Req is off.
8733 -- If Name_Req is True then we can't help returning a name which
8734 -- effectively allows multiple references in any case.
8736 elsif Is_Variable
(N
, Use_Original_Node
=> False) then
8737 return not Variable_Ref
8738 and then (not Is_Volatile_Reference
(N
) or else Name_Req
);
8740 -- Any other entity (e.g. a subtype name) is definitely side
8747 -- A value known at compile time is always side effect free
8749 elsif Compile_Time_Known_Value
(N
) then
8752 -- A variable renaming is not side-effect free, because the renaming
8753 -- will function like a macro in the front-end in some cases, and an
8754 -- assignment can modify the component designated by N, so we need to
8755 -- create a temporary for it.
8757 -- The guard testing for Entity being present is needed at least in
8758 -- the case of rewritten predicate expressions, and may well also be
8759 -- appropriate elsewhere. Obviously we can't go testing the entity
8760 -- field if it does not exist, so it's reasonable to say that this is
8761 -- not the renaming case if it does not exist.
8763 elsif Is_Entity_Name
(Original_Node
(N
))
8764 and then Present
(Entity
(Original_Node
(N
)))
8765 and then Is_Renaming_Of_Object
(Entity
(Original_Node
(N
)))
8766 and then Ekind
(Entity
(Original_Node
(N
))) /= E_Constant
8769 RO
: constant Node_Id
:=
8770 Renamed_Object
(Entity
(Original_Node
(N
)));
8773 -- If the renamed object is an indexed component, or an
8774 -- explicit dereference, then the designated object could
8775 -- be modified by an assignment.
8777 if Nkind_In
(RO
, N_Indexed_Component
,
8778 N_Explicit_Dereference
)
8782 -- A selected component must have a safe prefix
8784 elsif Nkind
(RO
) = N_Selected_Component
then
8785 return Safe_Prefixed_Reference
(RO
);
8787 -- In all other cases, designated object cannot be changed so
8788 -- we are side effect free.
8795 -- Remove_Side_Effects generates an object renaming declaration to
8796 -- capture the expression of a class-wide expression. In VM targets
8797 -- the frontend performs no expansion for dispatching calls to
8798 -- class- wide types since they are handled by the VM. Hence, we must
8799 -- locate here if this node corresponds to a previous invocation of
8800 -- Remove_Side_Effects to avoid a never ending loop in the frontend.
8802 elsif VM_Target
/= No_VM
8803 and then not Comes_From_Source
(N
)
8804 and then Nkind
(Parent
(N
)) = N_Object_Renaming_Declaration
8805 and then Is_Class_Wide_Type
(Typ
)
8810 -- For other than entity names and compile time known values,
8811 -- check the node kind for special processing.
8815 -- An attribute reference is side effect free if its expressions
8816 -- are side effect free and its prefix is side effect free or
8817 -- is an entity reference.
8819 -- Is this right? what about x'first where x is a variable???
8821 when N_Attribute_Reference
=>
8822 return Side_Effect_Free
(Expressions
(N
), Name_Req
, Variable_Ref
)
8823 and then Attribute_Name
(N
) /= Name_Input
8824 and then (Is_Entity_Name
(Prefix
(N
))
8825 or else Side_Effect_Free
8826 (Prefix
(N
), Name_Req
, Variable_Ref
));
8828 -- A binary operator is side effect free if and both operands are
8829 -- side effect free. For this purpose binary operators include
8830 -- membership tests and short circuit forms.
8832 when N_Binary_Op | N_Membership_Test | N_Short_Circuit
=>
8833 return Side_Effect_Free
(Left_Opnd
(N
), Name_Req
, Variable_Ref
)
8835 Side_Effect_Free
(Right_Opnd
(N
), Name_Req
, Variable_Ref
);
8837 -- An explicit dereference is side effect free only if it is
8838 -- a side effect free prefixed reference.
8840 when N_Explicit_Dereference
=>
8841 return Safe_Prefixed_Reference
(N
);
8843 -- An expression with action is side effect free if its expression
8844 -- is side effect free and it has no actions.
8846 when N_Expression_With_Actions
=>
8847 return Is_Empty_List
(Actions
(N
))
8849 Side_Effect_Free
(Expression
(N
), Name_Req
, Variable_Ref
);
8851 -- A call to _rep_to_pos is side effect free, since we generate
8852 -- this pure function call ourselves. Moreover it is critically
8853 -- important to make this exception, since otherwise we can have
8854 -- discriminants in array components which don't look side effect
8855 -- free in the case of an array whose index type is an enumeration
8856 -- type with an enumeration rep clause.
8858 -- All other function calls are not side effect free
8860 when N_Function_Call
=>
8861 return Nkind
(Name
(N
)) = N_Identifier
8862 and then Is_TSS
(Name
(N
), TSS_Rep_To_Pos
)
8865 (First
(Parameter_Associations
(N
)), Name_Req
, Variable_Ref
);
8867 -- An IF expression is side effect free if it's of a scalar type, and
8868 -- all its components are all side effect free (conditions and then
8869 -- actions and else actions). We restrict to scalar types, since it
8870 -- is annoying to deal with things like (if A then B else C)'First
8871 -- where the type involved is a string type.
8873 when N_If_Expression
=>
8874 return Is_Scalar_Type
(Typ
)
8876 Side_Effect_Free
(Expressions
(N
), Name_Req
, Variable_Ref
);
8878 -- An indexed component is side effect free if it is a side
8879 -- effect free prefixed reference and all the indexing
8880 -- expressions are side effect free.
8882 when N_Indexed_Component
=>
8883 return Side_Effect_Free
(Expressions
(N
), Name_Req
, Variable_Ref
)
8884 and then Safe_Prefixed_Reference
(N
);
8886 -- A type qualification is side effect free if the expression
8887 -- is side effect free.
8889 when N_Qualified_Expression
=>
8890 return Side_Effect_Free
(Expression
(N
), Name_Req
, Variable_Ref
);
8892 -- A selected component is side effect free only if it is a side
8893 -- effect free prefixed reference. If it designates a component
8894 -- with a rep. clause it must be treated has having a potential
8895 -- side effect, because it may be modified through a renaming, and
8896 -- a subsequent use of the renaming as a macro will yield the
8897 -- wrong value. This complex interaction between renaming and
8898 -- removing side effects is a reminder that the latter has become
8899 -- a headache to maintain, and that it should be removed in favor
8900 -- of the gcc mechanism to capture values ???
8902 when N_Selected_Component
=>
8903 if Nkind
(Parent
(N
)) = N_Explicit_Dereference
8904 and then Has_Non_Standard_Rep
(Designated_Type
(Typ
))
8908 return Safe_Prefixed_Reference
(N
);
8911 -- A range is side effect free if the bounds are side effect free
8914 return Side_Effect_Free
(Low_Bound
(N
), Name_Req
, Variable_Ref
)
8916 Side_Effect_Free
(High_Bound
(N
), Name_Req
, Variable_Ref
);
8918 -- A slice is side effect free if it is a side effect free
8919 -- prefixed reference and the bounds are side effect free.
8922 return Side_Effect_Free
8923 (Discrete_Range
(N
), Name_Req
, Variable_Ref
)
8924 and then Safe_Prefixed_Reference
(N
);
8926 -- A type conversion is side effect free if the expression to be
8927 -- converted is side effect free.
8929 when N_Type_Conversion
=>
8930 return Side_Effect_Free
(Expression
(N
), Name_Req
, Variable_Ref
);
8932 -- A unary operator is side effect free if the operand
8933 -- is side effect free.
8936 return Side_Effect_Free
(Right_Opnd
(N
), Name_Req
, Variable_Ref
);
8938 -- An unchecked type conversion is side effect free only if it
8939 -- is safe and its argument is side effect free.
8941 when N_Unchecked_Type_Conversion
=>
8942 return Safe_Unchecked_Type_Conversion
(N
)
8944 Side_Effect_Free
(Expression
(N
), Name_Req
, Variable_Ref
);
8946 -- An unchecked expression is side effect free if its expression
8947 -- is side effect free.
8949 when N_Unchecked_Expression
=>
8950 return Side_Effect_Free
(Expression
(N
), Name_Req
, Variable_Ref
);
8952 -- A literal is side effect free
8954 when N_Character_Literal |
8960 -- We consider that anything else has side effects. This is a bit
8961 -- crude, but we are pretty close for most common cases, and we
8962 -- are certainly correct (i.e. we never return True when the
8963 -- answer should be False).
8968 end Side_Effect_Free
;
8970 -- A list is side effect free if all elements of the list are side
8973 function Side_Effect_Free
8975 Name_Req
: Boolean := False;
8976 Variable_Ref
: Boolean := False) return Boolean
8981 if L
= No_List
or else L
= Error_List
then
8986 while Present
(N
) loop
8987 if not Side_Effect_Free
(N
, Name_Req
, Variable_Ref
) then
8996 end Side_Effect_Free
;
8998 ----------------------------------
8999 -- Silly_Boolean_Array_Not_Test --
9000 ----------------------------------
9002 -- This procedure implements an odd and silly test. We explicitly check
9003 -- for the case where the 'First of the component type is equal to the
9004 -- 'Last of this component type, and if this is the case, we make sure
9005 -- that constraint error is raised. The reason is that the NOT is bound
9006 -- to cause CE in this case, and we will not otherwise catch it.
9008 -- No such check is required for AND and OR, since for both these cases
9009 -- False op False = False, and True op True = True. For the XOR case,
9010 -- see Silly_Boolean_Array_Xor_Test.
9012 -- Believe it or not, this was reported as a bug. Note that nearly always,
9013 -- the test will evaluate statically to False, so the code will be
9014 -- statically removed, and no extra overhead caused.
9016 procedure Silly_Boolean_Array_Not_Test
(N
: Node_Id
; T
: Entity_Id
) is
9017 Loc
: constant Source_Ptr
:= Sloc
(N
);
9018 CT
: constant Entity_Id
:= Component_Type
(T
);
9021 -- The check we install is
9023 -- constraint_error when
9024 -- component_type'first = component_type'last
9025 -- and then array_type'Length /= 0)
9027 -- We need the last guard because we don't want to raise CE for empty
9028 -- arrays since no out of range values result. (Empty arrays with a
9029 -- component type of True .. True -- very useful -- even the ACATS
9030 -- does not test that marginal case).
9033 Make_Raise_Constraint_Error
(Loc
,
9039 Make_Attribute_Reference
(Loc
,
9040 Prefix
=> New_Occurrence_Of
(CT
, Loc
),
9041 Attribute_Name
=> Name_First
),
9044 Make_Attribute_Reference
(Loc
,
9045 Prefix
=> New_Occurrence_Of
(CT
, Loc
),
9046 Attribute_Name
=> Name_Last
)),
9048 Right_Opnd
=> Make_Non_Empty_Check
(Loc
, Right_Opnd
(N
))),
9049 Reason
=> CE_Range_Check_Failed
));
9050 end Silly_Boolean_Array_Not_Test
;
9052 ----------------------------------
9053 -- Silly_Boolean_Array_Xor_Test --
9054 ----------------------------------
9056 -- This procedure implements an odd and silly test. We explicitly check
9057 -- for the XOR case where the component type is True .. True, since this
9058 -- will raise constraint error. A special check is required since CE
9059 -- will not be generated otherwise (cf Expand_Packed_Not).
9061 -- No such check is required for AND and OR, since for both these cases
9062 -- False op False = False, and True op True = True, and no check is
9063 -- required for the case of False .. False, since False xor False = False.
9064 -- See also Silly_Boolean_Array_Not_Test
9066 procedure Silly_Boolean_Array_Xor_Test
(N
: Node_Id
; T
: Entity_Id
) is
9067 Loc
: constant Source_Ptr
:= Sloc
(N
);
9068 CT
: constant Entity_Id
:= Component_Type
(T
);
9071 -- The check we install is
9073 -- constraint_error when
9074 -- Boolean (component_type'First)
9075 -- and then Boolean (component_type'Last)
9076 -- and then array_type'Length /= 0)
9078 -- We need the last guard because we don't want to raise CE for empty
9079 -- arrays since no out of range values result (Empty arrays with a
9080 -- component type of True .. True -- very useful -- even the ACATS
9081 -- does not test that marginal case).
9084 Make_Raise_Constraint_Error
(Loc
,
9090 Convert_To
(Standard_Boolean
,
9091 Make_Attribute_Reference
(Loc
,
9092 Prefix
=> New_Occurrence_Of
(CT
, Loc
),
9093 Attribute_Name
=> Name_First
)),
9096 Convert_To
(Standard_Boolean
,
9097 Make_Attribute_Reference
(Loc
,
9098 Prefix
=> New_Occurrence_Of
(CT
, Loc
),
9099 Attribute_Name
=> Name_Last
))),
9101 Right_Opnd
=> Make_Non_Empty_Check
(Loc
, Right_Opnd
(N
))),
9102 Reason
=> CE_Range_Check_Failed
));
9103 end Silly_Boolean_Array_Xor_Test
;
9105 --------------------------
9106 -- Target_Has_Fixed_Ops --
9107 --------------------------
9109 Integer_Sized_Small
: Ureal
;
9110 -- Set to 2.0 ** -(Integer'Size - 1) the first time that this function is
9111 -- called (we don't want to compute it more than once).
9113 Long_Integer_Sized_Small
: Ureal
;
9114 -- Set to 2.0 ** -(Long_Integer'Size - 1) the first time that this function
9115 -- is called (we don't want to compute it more than once)
9117 First_Time_For_THFO
: Boolean := True;
9118 -- Set to False after first call (if Fractional_Fixed_Ops_On_Target)
9120 function Target_Has_Fixed_Ops
9121 (Left_Typ
: Entity_Id
;
9122 Right_Typ
: Entity_Id
;
9123 Result_Typ
: Entity_Id
) return Boolean
9125 function Is_Fractional_Type
(Typ
: Entity_Id
) return Boolean;
9126 -- Return True if the given type is a fixed-point type with a small
9127 -- value equal to 2 ** (-(T'Object_Size - 1)) and whose values have
9128 -- an absolute value less than 1.0. This is currently limited to
9129 -- fixed-point types that map to Integer or Long_Integer.
9131 ------------------------
9132 -- Is_Fractional_Type --
9133 ------------------------
9135 function Is_Fractional_Type
(Typ
: Entity_Id
) return Boolean is
9137 if Esize
(Typ
) = Standard_Integer_Size
then
9138 return Small_Value
(Typ
) = Integer_Sized_Small
;
9140 elsif Esize
(Typ
) = Standard_Long_Integer_Size
then
9141 return Small_Value
(Typ
) = Long_Integer_Sized_Small
;
9146 end Is_Fractional_Type
;
9148 -- Start of processing for Target_Has_Fixed_Ops
9151 -- Return False if Fractional_Fixed_Ops_On_Target is false
9153 if not Fractional_Fixed_Ops_On_Target
then
9157 -- Here the target has Fractional_Fixed_Ops, if first time, compute
9158 -- standard constants used by Is_Fractional_Type.
9160 if First_Time_For_THFO
then
9161 First_Time_For_THFO
:= False;
9163 Integer_Sized_Small
:=
9166 Den
=> UI_From_Int
(Standard_Integer_Size
- 1),
9169 Long_Integer_Sized_Small
:=
9172 Den
=> UI_From_Int
(Standard_Long_Integer_Size
- 1),
9176 -- Return True if target supports fixed-by-fixed multiply/divide for
9177 -- fractional fixed-point types (see Is_Fractional_Type) and the operand
9178 -- and result types are equivalent fractional types.
9180 return Is_Fractional_Type
(Base_Type
(Left_Typ
))
9181 and then Is_Fractional_Type
(Base_Type
(Right_Typ
))
9182 and then Is_Fractional_Type
(Base_Type
(Result_Typ
))
9183 and then Esize
(Left_Typ
) = Esize
(Right_Typ
)
9184 and then Esize
(Left_Typ
) = Esize
(Result_Typ
);
9185 end Target_Has_Fixed_Ops
;
9187 ------------------------------------------
9188 -- Type_May_Have_Bit_Aligned_Components --
9189 ------------------------------------------
9191 function Type_May_Have_Bit_Aligned_Components
9192 (Typ
: Entity_Id
) return Boolean
9195 -- Array type, check component type
9197 if Is_Array_Type
(Typ
) then
9199 Type_May_Have_Bit_Aligned_Components
(Component_Type
(Typ
));
9201 -- Record type, check components
9203 elsif Is_Record_Type
(Typ
) then
9208 E
:= First_Component_Or_Discriminant
(Typ
);
9209 while Present
(E
) loop
9210 if Component_May_Be_Bit_Aligned
(E
)
9211 or else Type_May_Have_Bit_Aligned_Components
(Etype
(E
))
9216 Next_Component_Or_Discriminant
(E
);
9222 -- Type other than array or record is always OK
9227 end Type_May_Have_Bit_Aligned_Components
;
9229 ----------------------------------
9230 -- Within_Case_Or_If_Expression --
9231 ----------------------------------
9233 function Within_Case_Or_If_Expression
(N
: Node_Id
) return Boolean is
9237 -- Locate an enclosing case or if expression. Note that these constructs
9238 -- can be expanded into Expression_With_Actions, hence the test of the
9242 while Present
(Par
) loop
9243 if Nkind_In
(Original_Node
(Par
), N_Case_Expression
,
9248 -- Prevent the search from going too far
9250 elsif Is_Body_Or_Package_Declaration
(Par
) then
9254 Par
:= Parent
(Par
);
9258 end Within_Case_Or_If_Expression
;
9260 --------------------------------
9261 -- Within_Internal_Subprogram --
9262 --------------------------------
9264 function Within_Internal_Subprogram
return Boolean is
9269 while Present
(S
) and then not Is_Subprogram
(S
) loop
9274 and then Get_TSS_Name
(S
) /= TSS_Null
9275 and then not Is_Predicate_Function
(S
);
9276 end Within_Internal_Subprogram
;
9278 ----------------------------
9279 -- Wrap_Cleanup_Procedure --
9280 ----------------------------
9282 procedure Wrap_Cleanup_Procedure
(N
: Node_Id
) is
9283 Loc
: constant Source_Ptr
:= Sloc
(N
);
9284 Stseq
: constant Node_Id
:= Handled_Statement_Sequence
(N
);
9285 Stmts
: constant List_Id
:= Statements
(Stseq
);
9287 if Abort_Allowed
then
9288 Prepend_To
(Stmts
, Build_Runtime_Call
(Loc
, RE_Abort_Defer
));
9289 Append_To
(Stmts
, Build_Runtime_Call
(Loc
, RE_Abort_Undefer
));
9291 end Wrap_Cleanup_Procedure
;