1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2021, 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 Atree
; use Atree
;
27 with Debug
; use Debug
;
28 with Debug_A
; use Debug_A
;
29 with Einfo
; use Einfo
;
30 with Einfo
.Entities
; use Einfo
.Entities
;
31 with Einfo
.Utils
; use Einfo
.Utils
;
32 with Elists
; use Elists
;
33 with Exp_SPARK
; use Exp_SPARK
;
34 with Expander
; use Expander
;
35 with Ghost
; use Ghost
;
37 with Lib
.Load
; use Lib
.Load
;
38 with Nlists
; use Nlists
;
39 with Output
; use Output
;
40 with Restrict
; use Restrict
;
41 with Sem_Attr
; use Sem_Attr
;
42 with Sem_Ch2
; use Sem_Ch2
;
43 with Sem_Ch3
; use Sem_Ch3
;
44 with Sem_Ch4
; use Sem_Ch4
;
45 with Sem_Ch5
; use Sem_Ch5
;
46 with Sem_Ch6
; use Sem_Ch6
;
47 with Sem_Ch7
; use Sem_Ch7
;
48 with Sem_Ch8
; use Sem_Ch8
;
49 with Sem_Ch9
; use Sem_Ch9
;
50 with Sem_Ch10
; use Sem_Ch10
;
51 with Sem_Ch11
; use Sem_Ch11
;
52 with Sem_Ch12
; use Sem_Ch12
;
53 with Sem_Ch13
; use Sem_Ch13
;
54 with Sem_Prag
; use Sem_Prag
;
55 with Sem_Util
; use Sem_Util
;
56 with Sinfo
; use Sinfo
;
57 with Sinfo
.Nodes
; use Sinfo
.Nodes
;
58 with Sinfo
.Utils
; use Sinfo
.Utils
;
59 with Stand
; use Stand
;
60 with Stylesw
; use Stylesw
;
61 with Uintp
; use Uintp
;
62 with Uname
; use Uname
;
64 with Unchecked_Deallocation
;
66 pragma Warnings
(Off
, Sem_Util
);
67 -- Suppress warnings of unused with for Sem_Util (used only in asserts)
71 Debug_Unit_Walk
: Boolean renames Debug_Flag_Dot_WW
;
72 -- Controls debugging printouts for Walk_Library_Items
74 Outer_Generic_Scope
: Entity_Id
:= Empty
;
75 -- Global reference to the outer scope that is generic. In a non-generic
76 -- context, it is empty. At the moment, it is only used for avoiding
77 -- freezing of external references in generics.
79 Comp_Unit_List
: Elist_Id
:= No_Elist
;
80 -- Used by Walk_Library_Items. This is a list of N_Compilation_Unit nodes
81 -- processed by Semantics, in an appropriate order. Initialized to
82 -- No_Elist, because it's too early to call New_Elmt_List; we will set it
83 -- to New_Elmt_List on first use.
86 with procedure Action
(Withed_Unit
: Node_Id
);
87 procedure Walk_Withs_Immediate
(CU
: Node_Id
; Include_Limited
: Boolean);
88 -- Walk all the with clauses of CU, and call Action for the with'ed unit.
89 -- Ignore limited withs, unless Include_Limited is True. CU must be an
90 -- N_Compilation_Unit.
93 with procedure Action
(Withed_Unit
: Node_Id
);
94 procedure Walk_Withs
(CU
: Node_Id
; Include_Limited
: Boolean);
95 -- Same as Walk_Withs_Immediate, but also include with clauses on subunits
96 -- of this unit, since they count as dependences on their parent library
97 -- item. CU must be an N_Compilation_Unit whose Unit is not an N_Subunit.
103 -- WARNING: This routine manages Ghost regions. Return statements must be
104 -- replaced by gotos which jump to the end of the routine and restore the
107 procedure Analyze
(N
: Node_Id
) is
108 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
109 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
110 -- Save the Ghost-related attributes to restore on exit
113 Debug_A_Entry
("analyzing ", N
);
115 -- Immediate return if already analyzed
118 Debug_A_Exit
("analyzing ", N
, " (done, analyzed already)");
122 -- A declaration may be subject to pragma Ghost. Set the mode now to
123 -- ensure that any nodes generated during analysis and expansion are
126 if Is_Declaration
(N
) then
127 Mark_And_Set_Ghost_Declaration
(N
);
130 -- Otherwise processing depends on the node kind
133 when N_Abort_Statement
=>
134 Analyze_Abort_Statement
(N
);
136 when N_Abstract_Subprogram_Declaration
=>
137 Analyze_Abstract_Subprogram_Declaration
(N
);
139 when N_Accept_Alternative
=>
140 Analyze_Accept_Alternative
(N
);
142 when N_Accept_Statement
=>
143 Analyze_Accept_Statement
(N
);
146 Analyze_Aggregate
(N
);
149 Analyze_Allocator
(N
);
152 Analyze_Short_Circuit
(N
);
154 when N_Assignment_Statement
=>
155 Analyze_Assignment
(N
);
157 when N_Asynchronous_Select
=>
158 Analyze_Asynchronous_Select
(N
);
161 Analyze_At_Clause
(N
);
163 when N_Attribute_Reference
=>
164 Analyze_Attribute
(N
);
166 when N_Attribute_Definition_Clause
=>
167 Analyze_Attribute_Definition_Clause
(N
);
169 when N_Block_Statement
=>
170 Analyze_Block_Statement
(N
);
172 when N_Case_Expression
=>
173 Analyze_Case_Expression
(N
);
175 when N_Case_Statement
=>
176 Analyze_Case_Statement
(N
);
178 when N_Character_Literal
=>
179 Analyze_Character_Literal
(N
);
181 when N_Code_Statement
=>
182 Analyze_Code_Statement
(N
);
184 when N_Compilation_Unit
=>
185 Analyze_Compilation_Unit
(N
);
187 when N_Component_Declaration
=>
188 Analyze_Component_Declaration
(N
);
190 when N_Compound_Statement
=>
191 Analyze_Compound_Statement
(N
);
193 when N_Conditional_Entry_Call
=>
194 Analyze_Conditional_Entry_Call
(N
);
196 when N_Delay_Alternative
=>
197 Analyze_Delay_Alternative
(N
);
199 when N_Delay_Relative_Statement
=>
200 Analyze_Delay_Relative
(N
);
202 when N_Delay_Until_Statement
=>
203 Analyze_Delay_Until
(N
);
205 when N_Delta_Aggregate
=>
206 Analyze_Aggregate
(N
);
209 Analyze_Entry_Body
(N
);
211 when N_Entry_Body_Formal_Part
=>
212 Analyze_Entry_Body_Formal_Part
(N
);
214 when N_Entry_Call_Alternative
=>
215 Analyze_Entry_Call_Alternative
(N
);
217 when N_Entry_Declaration
=>
218 Analyze_Entry_Declaration
(N
);
220 when N_Entry_Index_Specification
=>
221 Analyze_Entry_Index_Specification
(N
);
223 when N_Enumeration_Representation_Clause
=>
224 Analyze_Enumeration_Representation_Clause
(N
);
226 when N_Exception_Declaration
=>
227 Analyze_Exception_Declaration
(N
);
229 when N_Exception_Renaming_Declaration
=>
230 Analyze_Exception_Renaming
(N
);
232 when N_Exit_Statement
=>
233 Analyze_Exit_Statement
(N
);
235 when N_Expanded_Name
=>
236 Analyze_Expanded_Name
(N
);
238 when N_Explicit_Dereference
=>
239 Analyze_Explicit_Dereference
(N
);
241 when N_Expression_Function
=>
242 Analyze_Expression_Function
(N
);
244 when N_Expression_With_Actions
=>
245 Analyze_Expression_With_Actions
(N
);
247 when N_Extended_Return_Statement
=>
248 Analyze_Extended_Return_Statement
(N
);
250 when N_Extension_Aggregate
=>
251 Analyze_Aggregate
(N
);
253 when N_Formal_Object_Declaration
=>
254 Analyze_Formal_Object_Declaration
(N
);
256 when N_Formal_Package_Declaration
=>
257 Analyze_Formal_Package_Declaration
(N
);
259 when N_Formal_Subprogram_Declaration
=>
260 Analyze_Formal_Subprogram_Declaration
(N
);
262 when N_Formal_Type_Declaration
=>
263 Analyze_Formal_Type_Declaration
(N
);
265 when N_Free_Statement
=>
266 Analyze_Free_Statement
(N
);
268 when N_Freeze_Entity
=>
269 Analyze_Freeze_Entity
(N
);
271 when N_Freeze_Generic_Entity
=>
272 Analyze_Freeze_Generic_Entity
(N
);
274 when N_Full_Type_Declaration
=>
275 Analyze_Full_Type_Declaration
(N
);
277 when N_Function_Call
=>
278 Analyze_Function_Call
(N
);
280 when N_Function_Instantiation
=>
281 Analyze_Function_Instantiation
(N
);
283 when N_Generic_Function_Renaming_Declaration
=>
284 Analyze_Generic_Function_Renaming
(N
);
286 when N_Generic_Package_Declaration
=>
287 Analyze_Generic_Package_Declaration
(N
);
289 when N_Generic_Package_Renaming_Declaration
=>
290 Analyze_Generic_Package_Renaming
(N
);
292 when N_Generic_Procedure_Renaming_Declaration
=>
293 Analyze_Generic_Procedure_Renaming
(N
);
295 when N_Generic_Subprogram_Declaration
=>
296 Analyze_Generic_Subprogram_Declaration
(N
);
298 when N_Goto_Statement
=>
299 Analyze_Goto_Statement
(N
);
301 when N_Goto_When_Statement
=>
302 Analyze_Goto_When_Statement
(N
);
304 when N_Handled_Sequence_Of_Statements
=>
305 Analyze_Handled_Statements
(N
);
308 Analyze_Identifier
(N
);
310 when N_If_Expression
=>
311 Analyze_If_Expression
(N
);
313 when N_If_Statement
=>
314 Analyze_If_Statement
(N
);
316 when N_Implicit_Label_Declaration
=>
317 Analyze_Implicit_Label_Declaration
(N
);
320 Analyze_Membership_Op
(N
);
322 when N_Incomplete_Type_Declaration
=>
323 Analyze_Incomplete_Type_Decl
(N
);
325 when N_Indexed_Component
=>
326 Analyze_Indexed_Component_Form
(N
);
328 when N_Integer_Literal
=>
329 Analyze_Integer_Literal
(N
);
331 when N_Iterator_Specification
=>
332 Analyze_Iterator_Specification
(N
);
334 when N_Itype_Reference
=>
335 Analyze_Itype_Reference
(N
);
340 when N_Loop_Parameter_Specification
=>
341 Analyze_Loop_Parameter_Specification
(N
);
343 when N_Loop_Statement
=>
344 Analyze_Loop_Statement
(N
);
347 Analyze_Membership_Op
(N
);
352 when N_Null_Statement
=>
353 Analyze_Null_Statement
(N
);
355 when N_Number_Declaration
=>
356 Analyze_Number_Declaration
(N
);
358 when N_Object_Declaration
=>
359 Analyze_Object_Declaration
(N
);
361 when N_Object_Renaming_Declaration
=>
362 Analyze_Object_Renaming
(N
);
364 when N_Operator_Symbol
=>
365 Analyze_Operator_Symbol
(N
);
368 Analyze_Unary_Op
(N
);
371 Analyze_Arithmetic_Op
(N
);
374 Analyze_Logical_Op
(N
);
377 Analyze_Concatenation
(N
);
380 Analyze_Arithmetic_Op
(N
);
383 Analyze_Equality_Op
(N
);
386 Analyze_Arithmetic_Op
(N
);
389 Analyze_Comparison_Op
(N
);
392 Analyze_Comparison_Op
(N
);
395 Analyze_Comparison_Op
(N
);
398 Analyze_Comparison_Op
(N
);
401 Analyze_Unary_Op
(N
);
406 when N_Op_Multiply
=>
407 Analyze_Arithmetic_Op
(N
);
410 Analyze_Equality_Op
(N
);
413 Analyze_Negation
(N
);
416 Analyze_Logical_Op
(N
);
419 Analyze_Unary_Op
(N
);
422 Analyze_Arithmetic_Op
(N
);
424 when N_Op_Rotate_Left
=>
425 Analyze_Arithmetic_Op
(N
);
427 when N_Op_Rotate_Right
=>
428 Analyze_Arithmetic_Op
(N
);
430 when N_Op_Shift_Left
=>
431 Analyze_Arithmetic_Op
(N
);
433 when N_Op_Shift_Right
=>
434 Analyze_Arithmetic_Op
(N
);
436 when N_Op_Shift_Right_Arithmetic
=>
437 Analyze_Arithmetic_Op
(N
);
439 when N_Op_Subtract
=>
440 Analyze_Arithmetic_Op
(N
);
443 Analyze_Logical_Op
(N
);
446 Analyze_Short_Circuit
(N
);
448 when N_Others_Choice
=>
449 Analyze_Others_Choice
(N
);
451 when N_Package_Body
=>
452 Analyze_Package_Body
(N
);
454 when N_Package_Body_Stub
=>
455 Analyze_Package_Body_Stub
(N
);
457 when N_Package_Declaration
=>
458 Analyze_Package_Declaration
(N
);
460 when N_Package_Instantiation
=>
461 Analyze_Package_Instantiation
(N
);
463 when N_Package_Renaming_Declaration
=>
464 Analyze_Package_Renaming
(N
);
466 when N_Package_Specification
=>
467 Analyze_Package_Specification
(N
);
469 when N_Parameter_Association
=>
470 Analyze_Parameter_Association
(N
);
475 when N_Private_Extension_Declaration
=>
476 Analyze_Private_Extension_Declaration
(N
);
478 when N_Private_Type_Declaration
=>
479 Analyze_Private_Type_Declaration
(N
);
481 when N_Procedure_Call_Statement
=>
482 Analyze_Procedure_Call
(N
);
484 when N_Procedure_Instantiation
=>
485 Analyze_Procedure_Instantiation
(N
);
487 when N_Protected_Body
=>
488 Analyze_Protected_Body
(N
);
490 when N_Protected_Body_Stub
=>
491 Analyze_Protected_Body_Stub
(N
);
493 when N_Protected_Definition
=>
494 Analyze_Protected_Definition
(N
);
496 when N_Protected_Type_Declaration
=>
497 Analyze_Protected_Type_Declaration
(N
);
499 when N_Qualified_Expression
=>
500 Analyze_Qualified_Expression
(N
);
502 when N_Quantified_Expression
=>
503 Analyze_Quantified_Expression
(N
);
505 when N_Raise_Expression
=>
506 Analyze_Raise_Expression
(N
);
508 when N_Raise_Statement
=>
509 Analyze_Raise_Statement
(N
);
511 when N_Raise_When_Statement
=>
512 Analyze_Raise_When_Statement
(N
);
514 when N_Raise_xxx_Error
=>
515 Analyze_Raise_xxx_Error
(N
);
520 when N_Range_Constraint
=>
521 Analyze_Range
(Range_Expression
(N
));
523 when N_Real_Literal
=>
524 Analyze_Real_Literal
(N
);
526 when N_Record_Representation_Clause
=>
527 Analyze_Record_Representation_Clause
(N
);
530 Analyze_Reference
(N
);
532 when N_Requeue_Statement
=>
535 when N_Return_When_Statement
=>
536 Analyze_Return_When_Statement
(N
);
538 when N_Simple_Return_Statement
=>
539 Analyze_Simple_Return_Statement
(N
);
541 when N_Selected_Component
=>
542 Find_Selected_Component
(N
);
543 -- ??? why not Analyze_Selected_Component, needs comments
545 when N_Selective_Accept
=>
546 Analyze_Selective_Accept
(N
);
548 when N_Single_Protected_Declaration
=>
549 Analyze_Single_Protected_Declaration
(N
);
551 when N_Single_Task_Declaration
=>
552 Analyze_Single_Task_Declaration
(N
);
557 when N_String_Literal
=>
558 Analyze_String_Literal
(N
);
560 when N_Subprogram_Body
=>
561 Analyze_Subprogram_Body
(N
);
563 when N_Subprogram_Body_Stub
=>
564 Analyze_Subprogram_Body_Stub
(N
);
566 when N_Subprogram_Declaration
=>
567 Analyze_Subprogram_Declaration
(N
);
569 when N_Subprogram_Renaming_Declaration
=>
570 Analyze_Subprogram_Renaming
(N
);
572 when N_Subtype_Declaration
=>
573 Analyze_Subtype_Declaration
(N
);
575 when N_Subtype_Indication
=>
576 Analyze_Subtype_Indication
(N
);
581 when N_Target_Name
=>
582 Analyze_Target_Name
(N
);
585 Analyze_Task_Body
(N
);
587 when N_Task_Body_Stub
=>
588 Analyze_Task_Body_Stub
(N
);
590 when N_Task_Definition
=>
591 Analyze_Task_Definition
(N
);
593 when N_Task_Type_Declaration
=>
594 Analyze_Task_Type_Declaration
(N
);
596 when N_Terminate_Alternative
=>
597 Analyze_Terminate_Alternative
(N
);
599 when N_Timed_Entry_Call
=>
600 Analyze_Timed_Entry_Call
(N
);
602 when N_Triggering_Alternative
=>
603 Analyze_Triggering_Alternative
(N
);
605 when N_Type_Conversion
=>
606 Analyze_Type_Conversion
(N
);
608 when N_Unchecked_Expression
=>
609 Analyze_Unchecked_Expression
(N
);
611 when N_Unchecked_Type_Conversion
=>
612 Analyze_Unchecked_Type_Conversion
(N
);
614 when N_Use_Package_Clause
=>
615 Analyze_Use_Package
(N
);
617 when N_Use_Type_Clause
=>
618 Analyze_Use_Type
(N
);
620 when N_Validate_Unchecked_Conversion
=>
623 when N_Variant_Part
=>
624 Analyze_Variant_Part
(N
);
626 when N_With_Clause
=>
627 Analyze_With_Clause
(N
);
629 -- A call to analyze a marker is ignored because the node does not
630 -- have any static and run-time semantics.
633 | N_Variable_Reference_Marker
637 -- A call to analyze the Empty node is an error, but most likely it
638 -- is an error caused by an attempt to analyze a malformed piece of
639 -- tree caused by some other error, so if there have been any other
640 -- errors, we just ignore it, otherwise it is a real internal error
641 -- which we complain about.
643 -- We must also consider the case of call to a runtime function that
644 -- is not available in the configurable runtime.
647 pragma Assert
(Serious_Errors_Detected
/= 0
648 or else Configurable_Run_Time_Violations
/= 0);
651 -- A call to analyze the error node is simply ignored, to avoid
652 -- causing cascaded errors (happens of course only in error cases)
653 -- Disable expansion in case it is still enabled, to prevent other
654 -- subsequent compiler glitches.
657 Expander_Mode_Save_And_Set
(False);
660 -- Push/Pop nodes normally don't come through an analyze call. An
661 -- exception is the dummy ones bracketing a subprogram body. In any
662 -- case there is nothing to be done to analyze such nodes.
664 when N_Push_Pop_xxx_Label
=>
667 -- SCIL nodes don't need analysis because they are decorated when
668 -- they are built. They are added to the tree by Insert_Actions and
669 -- the call to analyze them is generated when the full list is
672 when N_SCIL_Dispatch_Table_Tag_Init
673 | N_SCIL_Dispatching_Call
674 | N_SCIL_Membership_Test
678 -- A quantified expression with a missing "all" or "some" qualifier
679 -- looks identical to an iterated component association. By language
680 -- definition, the latter must be present within array aggregates. If
681 -- this is not the case, then the iterated component association is
682 -- really an illegal quantified expression. Diagnose this scenario.
684 when N_Iterated_Component_Association
=>
685 Diagnose_Iterated_Component_Association
(N
);
687 when N_Iterated_Element_Association
=>
688 null; -- May require a more precise error if misplaced.
690 -- For the remaining node types, we generate compiler abort, because
691 -- these nodes are always analyzed within the Sem_Chn routines and
692 -- there should never be a case of making a call to the main Analyze
693 -- routine for these node kinds. For example, an N_Access_Definition
694 -- node appears only in the context of a type declaration, and is
695 -- processed by the analyze routine for type declarations.
697 when N_Abortable_Part
698 | N_Access_Definition
699 | N_Access_Function_Definition
700 | N_Access_Procedure_Definition
701 | N_Access_To_Object_Definition
702 | N_Aspect_Specification
703 | N_Case_Expression_Alternative
704 | N_Case_Statement_Alternative
705 | N_Compilation_Unit_Aux
706 | N_Component_Association
708 | N_Component_Definition
710 | N_Constrained_Array_Definition
712 | N_Decimal_Fixed_Point_Definition
713 | N_Defining_Character_Literal
714 | N_Defining_Identifier
715 | N_Defining_Operator_Symbol
716 | N_Defining_Program_Unit_Name
718 | N_Derived_Type_Definition
720 | N_Digits_Constraint
721 | N_Discriminant_Association
722 | N_Discriminant_Specification
724 | N_Entry_Call_Statement
725 | N_Enumeration_Type_Definition
726 | N_Exception_Handler
727 | N_Floating_Point_Definition
728 | N_Formal_Decimal_Fixed_Point_Definition
729 | N_Formal_Derived_Type_Definition
730 | N_Formal_Discrete_Type_Definition
731 | N_Formal_Floating_Point_Definition
732 | N_Formal_Modular_Type_Definition
733 | N_Formal_Ordinary_Fixed_Point_Definition
734 | N_Formal_Private_Type_Definition
735 | N_Formal_Incomplete_Type_Definition
736 | N_Formal_Signed_Integer_Type_Definition
737 | N_Function_Specification
738 | N_Generic_Association
739 | N_Index_Or_Discriminant_Constraint
742 | N_Modular_Type_Definition
743 | N_Ordinary_Fixed_Point_Definition
744 | N_Parameter_Specification
745 | N_Pragma_Argument_Association
746 | N_Procedure_Specification
747 | N_Real_Range_Specification
748 | N_Record_Definition
749 | N_Signed_Integer_Type_Definition
750 | N_Unconstrained_Array_Definition
758 Debug_A_Exit
("analyzing ", N
, " (done)");
760 -- Mark relevant use-type and use-package clauses as effective
761 -- preferring the original node over the analyzed one in the case that
762 -- constant folding has occurred and removed references that need to be
763 -- examined. Also, if the node in question is overloaded then this is
764 -- deferred until resolution.
767 Operat
: Node_Id
:= Empty
;
769 -- Attempt to obtain a checkable operator node
771 if Nkind
(Original_Node
(N
)) in N_Op
then
772 Operat
:= Original_Node
(N
);
773 elsif Nkind
(N
) in N_Op
then
780 and then Present
(Entity
(Operat
))
781 and then not Is_Overloaded
(Operat
)
783 Mark_Use_Clauses
(Operat
);
787 -- Now that we have analyzed the node, we call the expander to perform
788 -- possible expansion. We skip this for subexpressions, because we don't
789 -- have the type yet, and the expander will need to know the type before
790 -- it can do its job. For subexpression nodes, the call to the expander
791 -- happens in Sem_Res.Resolve. A special exception is Raise_xxx_Error,
792 -- which can appear in a statement context, and needs expanding now in
793 -- the case (distinguished by Etype, as documented in Sinfo).
795 -- The Analyzed flag is also set at this point for non-subexpression
796 -- nodes (in the case of subexpression nodes, we can't set the flag yet,
797 -- since resolution and expansion have not yet been completed). Note
798 -- that for N_Raise_xxx_Error we have to distinguish the expression
799 -- case from the statement case.
801 if Nkind
(N
) not in N_Subexpr
802 or else (Nkind
(N
) in N_Raise_xxx_Error
803 and then Etype
(N
) = Standard_Void_Type
)
807 -- Replace a reference to a renaming with the renamed object for SPARK.
808 -- In general this modification is performed by Expand_SPARK, however
809 -- certain constructs may not reach the resolution or expansion phase
810 -- and thus remain unchanged. The replacement is not performed when the
811 -- construct is overloaded as resolution must first take place. This is
812 -- also not done when analyzing a generic to preserve the original tree
813 -- and because the reference may become overloaded in the instance.
816 and then Nkind
(N
) in N_Expanded_Name | N_Identifier
817 and then not Is_Overloaded
(N
)
818 and then not Inside_A_Generic
820 Expand_SPARK_Potential_Renaming
(N
);
823 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
826 -- Version with check(s) suppressed
828 procedure Analyze
(N
: Node_Id
; Suppress
: Check_Id
) is
830 if Suppress
= All_Checks
then
832 Svs
: constant Suppress_Array
:= Scope_Suppress
.Suppress
;
834 Scope_Suppress
.Suppress
:= (others => True);
836 Scope_Suppress
.Suppress
:= Svs
;
841 Svg
: constant Boolean := Scope_Suppress
.Suppress
(Suppress
);
843 Scope_Suppress
.Suppress
(Suppress
) := True;
845 Scope_Suppress
.Suppress
(Suppress
) := Svg
;
854 procedure Analyze_List
(L
: List_Id
) is
859 while Present
(Node
) loop
865 -- Version with check(s) suppressed
867 procedure Analyze_List
(L
: List_Id
; Suppress
: Check_Id
) is
869 if Suppress
= All_Checks
then
871 Svs
: constant Suppress_Array
:= Scope_Suppress
.Suppress
;
873 Scope_Suppress
.Suppress
:= (others => True);
875 Scope_Suppress
.Suppress
:= Svs
;
880 Svg
: constant Boolean := Scope_Suppress
.Suppress
(Suppress
);
882 Scope_Suppress
.Suppress
(Suppress
) := True;
884 Scope_Suppress
.Suppress
(Suppress
) := Svg
;
889 --------------------------
890 -- Copy_Suppress_Status --
891 --------------------------
893 procedure Copy_Suppress_Status
899 pragma Warnings
(Off
, Found
);
901 procedure Search_Stack
902 (Top
: Suppress_Stack_Entry_Ptr
;
903 Found
: out Boolean);
904 -- Search given suppress stack for matching entry for entity. If found
905 -- then set Checks_May_Be_Suppressed on To, and push an appropriate
906 -- entry for To onto the local suppress stack.
912 procedure Search_Stack
913 (Top
: Suppress_Stack_Entry_Ptr
;
916 Ptr
: Suppress_Stack_Entry_Ptr
;
920 while Ptr
/= null loop
922 and then (Ptr
.Check
= All_Checks
or else Ptr
.Check
= C
)
925 Set_Checks_May_Be_Suppressed
(To
, True);
926 Push_Local_Suppress_Stack_Entry
942 -- Start of processing for Copy_Suppress_Status
945 if not Checks_May_Be_Suppressed
(From
) then
949 -- First search the global entity suppress table for a matching entry.
950 -- We also search this in reverse order so that if there are multiple
951 -- pragmas for the same entity, the last one applies.
953 Search_Stack
(Global_Suppress_Stack_Top
, Found
);
959 -- Now search the local entity suppress stack, we search this in
960 -- reverse order so that we get the innermost entry that applies to
961 -- this case if there are nested entries. Note that for the purpose
962 -- of this procedure we are ONLY looking for entries corresponding
963 -- to a two-argument Suppress, where the second argument matches From.
965 Search_Stack
(Local_Suppress_Stack_Top
, Found
);
966 end Copy_Suppress_Status
;
968 -------------------------
969 -- Enter_Generic_Scope --
970 -------------------------
972 procedure Enter_Generic_Scope
(S
: Entity_Id
) is
974 if No
(Outer_Generic_Scope
) then
975 Outer_Generic_Scope
:= S
;
977 end Enter_Generic_Scope
;
979 ------------------------
980 -- Exit_Generic_Scope --
981 ------------------------
983 procedure Exit_Generic_Scope
(S
: Entity_Id
) is
985 if S
= Outer_Generic_Scope
then
986 Outer_Generic_Scope
:= Empty
;
988 end Exit_Generic_Scope
;
990 -----------------------
991 -- Explicit_Suppress --
992 -----------------------
994 function Explicit_Suppress
(E
: Entity_Id
; C
: Check_Id
) return Boolean is
995 Ptr
: Suppress_Stack_Entry_Ptr
;
998 if not Checks_May_Be_Suppressed
(E
) then
1002 Ptr
:= Global_Suppress_Stack_Top
;
1003 while Ptr
/= null loop
1005 and then (Ptr
.Check
= All_Checks
or else Ptr
.Check
= C
)
1007 return Ptr
.Suppress
;
1015 end Explicit_Suppress
;
1017 -----------------------------
1018 -- External_Ref_In_Generic --
1019 -----------------------------
1021 function External_Ref_In_Generic
(E
: Entity_Id
) return Boolean is
1025 -- Entity is global if defined outside of current Outer_Generic_Scope:
1026 -- Either the entity has a smaller depth than the outer generic, or it
1027 -- is in a different compilation unit, or it is defined within a unit
1028 -- in the same compilation, that is not within the outer generic.
1030 if No
(Outer_Generic_Scope
) then
1033 -- It makes no sense to compare depths if not in same unit. Scope_Depth
1034 -- is not set for inherited operations.
1036 elsif not In_Same_Source_Unit
(E
, Outer_Generic_Scope
)
1037 or else not Scope_Depth_Set
(Scope
(E
))
1038 or else Scope_Depth
(Scope
(E
)) < Scope_Depth
(Outer_Generic_Scope
)
1044 while Present
(Scop
) loop
1045 if Scop
= Outer_Generic_Scope
then
1047 elsif Scope_Depth
(Scop
) < Scope_Depth
(Outer_Generic_Scope
) then
1050 Scop
:= Scope
(Scop
);
1056 end External_Ref_In_Generic
;
1062 procedure Initialize
is
1063 Next
: Suppress_Stack_Entry_Ptr
;
1065 procedure Free
is new Unchecked_Deallocation
1066 (Suppress_Stack_Entry
, Suppress_Stack_Entry_Ptr
);
1069 -- Free any global suppress stack entries from a previous invocation
1070 -- of the compiler (in the normal case this loop does nothing).
1072 while Suppress_Stack_Entries
/= null loop
1073 Next
:= Suppress_Stack_Entries
.Next
;
1074 Free
(Suppress_Stack_Entries
);
1075 Suppress_Stack_Entries
:= Next
;
1078 Local_Suppress_Stack_Top
:= null;
1079 Global_Suppress_Stack_Top
:= null;
1081 -- Clear scope stack, and reset global variables
1084 Unloaded_Subunits
:= False;
1087 ------------------------------
1088 -- Insert_After_And_Analyze --
1089 ------------------------------
1091 procedure Insert_After_And_Analyze
(N
: Node_Id
; M
: Node_Id
) is
1097 -- If we are not at the end of the list, then the easiest
1098 -- coding is simply to insert before our successor.
1100 if Present
(Next
(N
)) then
1101 Insert_Before_And_Analyze
(Next
(N
), M
);
1103 -- Case of inserting at the end of the list
1106 -- Capture the Node_Id of the node to be inserted. This Node_Id
1107 -- will still be the same after the insert operation.
1110 Insert_After
(N
, M
);
1112 -- Now just analyze from the inserted node to the end of
1113 -- the new list (note that this properly handles the case
1114 -- where any of the analyze calls result in the insertion of
1115 -- nodes after the analyzed node, expecting analysis).
1117 while Present
(Node
) loop
1119 Mark_Rewrite_Insertion
(Node
);
1124 end Insert_After_And_Analyze
;
1126 -- Version with check(s) suppressed
1128 procedure Insert_After_And_Analyze
1131 Suppress
: Check_Id
)
1134 if Suppress
= All_Checks
then
1136 Svs
: constant Suppress_Array
:= Scope_Suppress
.Suppress
;
1138 Scope_Suppress
.Suppress
:= (others => True);
1139 Insert_After_And_Analyze
(N
, M
);
1140 Scope_Suppress
.Suppress
:= Svs
;
1145 Svg
: constant Boolean := Scope_Suppress
.Suppress
(Suppress
);
1147 Scope_Suppress
.Suppress
(Suppress
) := True;
1148 Insert_After_And_Analyze
(N
, M
);
1149 Scope_Suppress
.Suppress
(Suppress
) := Svg
;
1152 end Insert_After_And_Analyze
;
1154 -------------------------------
1155 -- Insert_Before_And_Analyze --
1156 -------------------------------
1158 procedure Insert_Before_And_Analyze
(N
: Node_Id
; M
: Node_Id
) is
1164 -- Capture the Node_Id of the first list node to be inserted.
1165 -- This will still be the first node after the insert operation,
1166 -- since Insert_List_After does not modify the Node_Id values.
1169 Insert_Before
(N
, M
);
1171 -- The insertion does not change the Id's of any of the nodes in
1172 -- the list, and they are still linked, so we can simply loop from
1173 -- the original first node until we meet the node before which the
1174 -- insertion is occurring. Note that this properly handles the case
1175 -- where any of the analyzed nodes insert nodes after themselves,
1176 -- expecting them to get analyzed.
1178 while Node
/= N
loop
1180 Mark_Rewrite_Insertion
(Node
);
1184 end Insert_Before_And_Analyze
;
1186 -- Version with check(s) suppressed
1188 procedure Insert_Before_And_Analyze
1191 Suppress
: Check_Id
)
1194 if Suppress
= All_Checks
then
1196 Svs
: constant Suppress_Array
:= Scope_Suppress
.Suppress
;
1198 Scope_Suppress
.Suppress
:= (others => True);
1199 Insert_Before_And_Analyze
(N
, M
);
1200 Scope_Suppress
.Suppress
:= Svs
;
1205 Svg
: constant Boolean := Scope_Suppress
.Suppress
(Suppress
);
1207 Scope_Suppress
.Suppress
(Suppress
) := True;
1208 Insert_Before_And_Analyze
(N
, M
);
1209 Scope_Suppress
.Suppress
(Suppress
) := Svg
;
1212 end Insert_Before_And_Analyze
;
1214 --------------------------------------------
1215 -- Insert_Before_First_Source_Declaration --
1216 --------------------------------------------
1218 procedure Insert_Before_First_Source_Declaration
1224 -- Inspect the declarations of the related subprogram body looking for
1225 -- the first source declaration.
1227 pragma Assert
(Present
(Decls
));
1229 Decl
:= First
(Decls
);
1230 while Present
(Decl
) loop
1231 if Comes_From_Source
(Decl
) then
1232 Insert_Before
(Decl
, Stmt
);
1239 -- If we get there, then the subprogram body lacks any source
1240 -- declarations. The body of _Postconditions now acts as the
1241 -- last declaration.
1243 Append
(Stmt
, Decls
);
1244 end Insert_Before_First_Source_Declaration
;
1246 -----------------------------------
1247 -- Insert_List_After_And_Analyze --
1248 -----------------------------------
1250 procedure Insert_List_After_And_Analyze
(N
: Node_Id
; L
: List_Id
) is
1251 After
: constant Node_Id
:= Next
(N
);
1255 if Is_Non_Empty_List
(L
) then
1257 -- Capture the Node_Id of the first list node to be inserted.
1258 -- This will still be the first node after the insert operation,
1259 -- since Insert_List_After does not modify the Node_Id values.
1262 Insert_List_After
(N
, L
);
1264 -- Now just analyze from the original first node until we get to the
1265 -- successor of the original insertion point (which may be Empty if
1266 -- the insertion point was at the end of the list). Note that this
1267 -- properly handles the case where any of the analyze calls result in
1268 -- the insertion of nodes after the analyzed node (possibly calling
1269 -- this routine recursively).
1271 while Node
/= After
loop
1273 Mark_Rewrite_Insertion
(Node
);
1277 end Insert_List_After_And_Analyze
;
1279 ------------------------------------
1280 -- Insert_List_Before_And_Analyze --
1281 ------------------------------------
1283 procedure Insert_List_Before_And_Analyze
(N
: Node_Id
; L
: List_Id
) is
1287 if Is_Non_Empty_List
(L
) then
1289 -- Capture the Node_Id of the first list node to be inserted. This
1290 -- will still be the first node after the insert operation, since
1291 -- Insert_List_After does not modify the Node_Id values.
1294 Insert_List_Before
(N
, L
);
1296 -- The insertion does not change the Id's of any of the nodes in
1297 -- the list, and they are still linked, so we can simply loop from
1298 -- the original first node until we meet the node before which the
1299 -- insertion is occurring. Note that this properly handles the case
1300 -- where any of the analyzed nodes insert nodes after themselves,
1301 -- expecting them to get analyzed.
1303 while Node
/= N
loop
1305 Mark_Rewrite_Insertion
(Node
);
1309 end Insert_List_Before_And_Analyze
;
1317 Scope_Stack
.Release
;
1318 Scope_Stack
.Locked
:= True;
1321 ------------------------
1322 -- Preanalysis_Active --
1323 ------------------------
1325 function Preanalysis_Active
return Boolean is
1327 return not Full_Analysis
and not Expander_Active
;
1328 end Preanalysis_Active
;
1334 procedure Preanalyze
(N
: Node_Id
) is
1335 Save_Full_Analysis
: constant Boolean := Full_Analysis
;
1338 Full_Analysis
:= False;
1339 Expander_Mode_Save_And_Set
(False);
1343 Expander_Mode_Restore
;
1344 Full_Analysis
:= Save_Full_Analysis
;
1347 --------------------------------------
1348 -- Push_Global_Suppress_Stack_Entry --
1349 --------------------------------------
1351 procedure Push_Global_Suppress_Stack_Entry
1352 (Entity
: Entity_Id
;
1357 Global_Suppress_Stack_Top
:=
1358 new Suppress_Stack_Entry
'
1361 Suppress => Suppress,
1362 Prev => Global_Suppress_Stack_Top,
1363 Next => Suppress_Stack_Entries);
1364 Suppress_Stack_Entries := Global_Suppress_Stack_Top;
1366 end Push_Global_Suppress_Stack_Entry;
1368 -------------------------------------
1369 -- Push_Local_Suppress_Stack_Entry --
1370 -------------------------------------
1372 procedure Push_Local_Suppress_Stack_Entry
1373 (Entity : Entity_Id;
1378 Local_Suppress_Stack_Top :=
1379 new Suppress_Stack_Entry'
1382 Suppress
=> Suppress
,
1383 Prev
=> Local_Suppress_Stack_Top
,
1384 Next
=> Suppress_Stack_Entries
);
1385 Suppress_Stack_Entries
:= Local_Suppress_Stack_Top
;
1388 end Push_Local_Suppress_Stack_Entry
;
1394 procedure Semantics
(Comp_Unit
: Node_Id
) is
1395 procedure Do_Analyze
;
1396 -- Perform the analysis of the compilation unit
1402 -- WARNING: This routine manages Ghost regions. Return statements must
1403 -- be replaced by gotos which jump to the end of the routine and restore
1406 procedure Do_Analyze
is
1407 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
1408 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
1409 Saved_ISMP
: constant Boolean :=
1410 Ignore_SPARK_Mode_Pragmas_In_Instance
;
1411 -- Save Ghost and SPARK mode-related data to restore on exit
1413 -- Generally style checks are preserved across compilations, with
1414 -- one exception: s-oscons.ads, which allows arbitrary long lines
1415 -- unconditionally, and has no restore mechanism, because it is
1416 -- intended as a lowest-level Pure package.
1418 Saved_ML
: constant Int
:= Style_Max_Line_Length
;
1419 Saved_CML
: constant Boolean := Style_Check_Max_Line_Length
;
1424 List
:= Save_Scope_Stack
;
1425 Push_Scope
(Standard_Standard
);
1427 -- Set up a clean environment before analyzing
1429 Install_Ghost_Region
(None
, Empty
);
1430 Ignore_SPARK_Mode_Pragmas_In_Instance
:= False;
1432 Outer_Generic_Scope
:= Empty
;
1433 Scope_Suppress
:= Suppress_Options
;
1435 (Scope_Stack
.Last
).Component_Alignment_Default
:=
1436 Configuration_Component_Alignment
;
1438 (Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
1440 -- Now analyze the top level compilation unit node
1442 Analyze
(Comp_Unit
);
1444 -- Check for scope mismatch on exit from compilation
1446 pragma Assert
(Current_Scope
= Standard_Standard
1447 or else Comp_Unit
= Cunit
(Main_Unit
));
1449 -- Then pop entry for Standard, and pop implicit types
1452 Restore_Scope_Stack
(List
);
1453 Style_Max_Line_Length
:= Saved_ML
;
1454 Style_Check_Max_Line_Length
:= Saved_CML
;
1456 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
1457 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
1462 -- The following locations save the corresponding global flags and
1463 -- variables so that they can be restored on completion. This is needed
1464 -- so that calls to Rtsfind start with the proper default values for
1465 -- these variables, and also that such calls do not disturb the settings
1466 -- for units being analyzed at a higher level.
1468 S_Current_Sem_Unit
: constant Unit_Number_Type
:= Current_Sem_Unit
;
1469 S_Full_Analysis
: constant Boolean := Full_Analysis
;
1470 S_GNAT_Mode
: constant Boolean := GNAT_Mode
;
1471 S_Global_Dis_Names
: constant Boolean := Global_Discard_Names
;
1472 S_In_Assertion_Expr
: constant Nat
:= In_Assertion_Expr
;
1473 S_In_Declare_Expr
: constant Nat
:= In_Declare_Expr
;
1474 S_In_Default_Expr
: constant Boolean := In_Default_Expr
;
1475 S_In_Spec_Expr
: constant Boolean := In_Spec_Expression
;
1476 S_Inside_A_Generic
: constant Boolean := Inside_A_Generic
;
1477 S_Outer_Gen_Scope
: constant Entity_Id
:= Outer_Generic_Scope
;
1478 S_Style_Check
: constant Boolean := Style_Check
;
1480 Already_Analyzed
: constant Boolean := Analyzed
(Comp_Unit
);
1482 Curunit
: constant Unit_Number_Type
:= Get_Cunit_Unit_Number
(Comp_Unit
);
1483 -- New value of Current_Sem_Unit
1485 Generic_Main
: constant Boolean :=
1486 Nkind
(Unit
(Cunit
(Main_Unit
))) in N_Generic_Declaration
;
1487 -- If the main unit is generic, every compiled unit, including its
1488 -- context, is compiled with expansion disabled.
1490 Is_Main_Unit_Or_Main_Unit_Spec
: constant Boolean :=
1493 (Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Package_Body
1494 and then Library_Unit
(Cunit
(Main_Unit
)) = Cunit
(Curunit
));
1495 -- Configuration flags have special settings when compiling a predefined
1496 -- file as a main unit. This applies to its spec as well.
1498 Ext_Main_Source_Unit
: constant Boolean :=
1499 In_Extended_Main_Source_Unit
(Comp_Unit
);
1500 -- Determine if unit is in extended main source unit
1502 Save_Config_Attrs
: Config_Switches_Type
;
1503 -- Variable used to save values of config switches while we analyze the
1504 -- new unit, to be restored on exit for proper recursive behavior.
1506 Save_Cunit_Restrictions
: Save_Cunit_Boolean_Restrictions
;
1507 -- Used to save non-partition wide restrictions before processing new
1508 -- unit. All with'ed units are analyzed with config restrictions reset
1509 -- and we need to restore these saved values at the end.
1511 Save_Preanalysis_Counter
: constant Nat
:=
1512 Inside_Preanalysis_Without_Freezing
;
1513 -- Saves the preanalysis nesting-level counter; required since we may
1514 -- need to analyze a unit as a consequence of the preanalysis of an
1515 -- expression without freezing (and the loaded unit must be fully
1518 -- Start of processing for Semantics
1521 Inside_Preanalysis_Without_Freezing
:= 0;
1523 if Debug_Unit_Walk
then
1524 if Already_Analyzed
then
1525 Write_Str
("(done)");
1529 (Get_Cunit_Unit_Number
(Comp_Unit
),
1535 Compiler_State
:= Analyzing
;
1536 Current_Sem_Unit
:= Curunit
;
1538 -- Compile predefined units with GNAT_Mode set to True, to properly
1539 -- process the categorization stuff. However, do not set GNAT_Mode
1540 -- to True for the renamings units (Text_IO, IO_Exceptions, Direct_IO,
1541 -- Sequential_IO) as this would prevent pragma Extend_System from being
1542 -- taken into account, for example when Text_IO is renaming DEC.Text_IO.
1544 if Is_Predefined_Unit
(Current_Sem_Unit
)
1545 and then not Is_Predefined_Renaming
(Current_Sem_Unit
)
1550 -- For generic main, never do expansion
1552 if Generic_Main
then
1553 Expander_Mode_Save_And_Set
(False);
1558 Expander_Mode_Save_And_Set
1560 -- Turn on expansion if generating code
1562 (Operating_Mode
= Generate_Code
1564 -- Or if special debug flag -gnatdx is set
1566 or else Debug_Flag_X
1568 -- Or if in configuration run-time mode. We do this so we get
1569 -- error messages about missing entities in the run-time even
1570 -- if we are compiling in -gnatc (no code generation) mode.
1571 -- Similar processing applies to No_Run_Time_Mode. However,
1572 -- don't do this if debug flag -gnatd.Z is set or when we are
1573 -- compiling a separate unit (this is to handle a situation
1574 -- where this new processing causes trouble).
1577 ((Configurable_Run_Time_Mode
or No_Run_Time_Mode
)
1578 and then not Debug_Flag_Dot_ZZ
1579 and then Nkind
(Unit
(Cunit
(Main_Unit
))) /= N_Subunit
));
1582 Full_Analysis
:= True;
1583 Inside_A_Generic
:= False;
1584 In_Assertion_Expr
:= 0;
1585 In_Declare_Expr
:= 0;
1586 In_Default_Expr
:= False;
1587 In_Spec_Expression
:= False;
1588 Set_Comes_From_Source_Default
(False);
1590 -- Save current config switches and reset then appropriately
1592 Save_Config_Attrs
:= Save_Config_Switches
;
1594 (Is_Internal_Unit
(Current_Sem_Unit
),
1595 Is_Main_Unit_Or_Main_Unit_Spec
);
1597 -- Save current non-partition-wide restrictions
1599 Save_Cunit_Restrictions
:= Cunit_Boolean_Restrictions_Save
;
1601 -- For unit in main extended unit, we reset the configuration values
1602 -- for the non-partition-wide restrictions. For other units reset them.
1604 if Ext_Main_Source_Unit
then
1605 Restore_Config_Cunit_Boolean_Restrictions
;
1607 Reset_Cunit_Boolean_Restrictions
;
1610 -- Turn off style checks for unit that is not in the extended main
1611 -- source unit. This improves processing efficiency for such units
1612 -- (for which we don't want style checks anyway, and where they will
1613 -- get suppressed), and is definitely needed to stop some style checks
1614 -- from invading the run-time units (e.g. overriding checks).
1616 if not Ext_Main_Source_Unit
then
1617 Style_Check
:= False;
1619 -- If this is part of the extended main source unit, set style check
1620 -- mode to match the style check mode of the main source unit itself.
1623 Style_Check
:= Style_Check_Main
;
1626 -- Only do analysis of unit that has not already been analyzed
1628 if not Analyzed
(Comp_Unit
) then
1629 Initialize_Version
(Current_Sem_Unit
);
1631 -- Do analysis, and then append the compilation unit onto the
1632 -- Comp_Unit_List, if appropriate. This is done after analysis,
1633 -- so if this unit depends on some others, they have already been
1634 -- appended. We ignore bodies, except for the main unit itself, and
1635 -- for subprogram bodies that act as specs. We have also to guard
1636 -- against ill-formed subunits that have an improper context.
1640 if Present
(Comp_Unit
)
1641 and then Nkind
(Unit
(Comp_Unit
)) in N_Proper_Body
1642 and then (Nkind
(Unit
(Comp_Unit
)) /= N_Subprogram_Body
1643 or else not Acts_As_Spec
(Comp_Unit
))
1644 and then not Ext_Main_Source_Unit
1649 Append_New_Elmt
(Comp_Unit
, To
=> Comp_Unit_List
);
1651 if Debug_Unit_Walk
then
1652 Write_Str
("Appending ");
1654 (Get_Cunit_Unit_Number
(Comp_Unit
), Unit
(Comp_Unit
));
1659 -- Save indication of dynamic elaboration checks for ALI file
1661 Set_Dynamic_Elab
(Current_Sem_Unit
, Dynamic_Elaboration_Checks
);
1663 -- Restore settings of saved switches to entry values
1665 Current_Sem_Unit
:= S_Current_Sem_Unit
;
1666 Full_Analysis
:= S_Full_Analysis
;
1667 Global_Discard_Names
:= S_Global_Dis_Names
;
1668 GNAT_Mode
:= S_GNAT_Mode
;
1669 In_Assertion_Expr
:= S_In_Assertion_Expr
;
1670 In_Declare_Expr
:= S_In_Declare_Expr
;
1671 In_Default_Expr
:= S_In_Default_Expr
;
1672 In_Spec_Expression
:= S_In_Spec_Expr
;
1673 Inside_A_Generic
:= S_Inside_A_Generic
;
1674 Outer_Generic_Scope
:= S_Outer_Gen_Scope
;
1675 Style_Check
:= S_Style_Check
;
1677 Restore_Config_Switches
(Save_Config_Attrs
);
1679 -- Deal with restore of restrictions
1681 Cunit_Boolean_Restrictions_Restore
(Save_Cunit_Restrictions
);
1683 Expander_Mode_Restore
;
1685 if Debug_Unit_Walk
then
1688 if Already_Analyzed
then
1689 Write_Str
("(done)");
1693 (Get_Cunit_Unit_Number
(Comp_Unit
),
1698 Inside_Preanalysis_Without_Freezing
:= Save_Preanalysis_Counter
;
1705 function ss
(Index
: Int
) return Scope_Stack_Entry
is
1707 return Scope_Stack
.Table
(Index
);
1714 function sst
return Scope_Stack_Entry
is
1716 return ss
(Scope_Stack
.Last
);
1725 Scope_Stack
.Locked
:= False;
1728 ------------------------
1729 -- Walk_Library_Items --
1730 ------------------------
1732 procedure Walk_Library_Items
is
1733 type Unit_Number_Set
is array (Main_Unit
.. Last_Unit
) of Boolean;
1734 pragma Pack
(Unit_Number_Set
);
1736 Main_CU
: constant Node_Id
:= Cunit
(Main_Unit
);
1737 Spec_CU
: Node_Id
:= Empty
;
1739 Seen
, Done
: Unit_Number_Set
:= (others => False);
1740 -- Seen (X) is True after we have seen unit X in the walk. This is used
1741 -- to prevent processing the same unit more than once. Done (X) is True
1742 -- after we have fully processed X, and is used only for debugging
1743 -- printouts and assertions.
1745 Do_Main
: Boolean := False;
1746 -- Flag to delay processing the main body until after all other units.
1747 -- This is needed because the spec of the main unit may appear in the
1748 -- context of some other unit. We do not want this to force processing
1749 -- of the main body before all other units have been processed.
1751 -- Another circularity pattern occurs when the main unit is a child unit
1752 -- and the body of an ancestor has a with-clause of the main unit or on
1753 -- one of its children. In both cases the body in question has a with-
1754 -- clause on the main unit, and must be excluded from the traversal. In
1755 -- some convoluted cases this may lead to a CodePeer error because the
1756 -- spec of a subprogram declared in an instance within the parent will
1757 -- not be seen in the main unit.
1759 function Depends_On_Main
(CU
: Node_Id
) return Boolean;
1760 -- The body of a unit that is withed by the spec of the main unit may in
1761 -- turn have a with_clause on that spec. In that case do not traverse
1762 -- the body, to prevent loops. It can also happen that the main body has
1763 -- a with_clause on a child, which of course has an implicit with on its
1764 -- parent. It's OK to traverse the child body if the main spec has been
1765 -- processed, otherwise we also have a circularity to avoid.
1767 procedure Do_Action
(CU
: Node_Id
; Item
: Node_Id
);
1768 -- Calls Action, with some validity checks
1770 procedure Do_Unit_And_Dependents
(CU
: Node_Id
; Item
: Node_Id
);
1771 -- Calls Do_Action, first on the units with'ed by this one, then on
1772 -- this unit. If it's an instance body, do the spec first. If it is
1773 -- an instance spec, do the body last.
1775 procedure Do_Withed_Unit
(Withed_Unit
: Node_Id
);
1776 -- Apply Do_Unit_And_Dependents to a unit in a context clause
1778 procedure Process_Bodies_In_Context
(Comp
: Node_Id
);
1779 -- The main unit and its spec may depend on bodies that contain generics
1780 -- that are instantiated in them. Iterate through the corresponding
1781 -- contexts before processing main (spec/body) itself, to process bodies
1782 -- that may be present, together with their context. The spec of main
1783 -- is processed wherever it appears in the list of units, while the body
1784 -- is processed as the last unit in the list.
1786 ---------------------
1787 -- Depends_On_Main --
1788 ---------------------
1790 function Depends_On_Main
(CU
: Node_Id
) return Boolean is
1792 MCU
: constant Node_Id
:= Unit
(Main_CU
);
1795 -- Problem does not arise with main subprograms
1797 if Nkind
(MCU
) not in N_Package_Body | N_Package_Declaration
then
1801 CL
:= First
(Context_Items
(CU
));
1803 while Present
(CL
) loop
1804 if Nkind
(CL
) = N_With_Clause
1805 and then Library_Unit
(CL
) = Main_CU
1806 and then not Done
(Get_Cunit_Unit_Number
(Library_Unit
(CL
)))
1815 end Depends_On_Main
;
1821 procedure Do_Action
(CU
: Node_Id
; Item
: Node_Id
) is
1823 -- This calls Action at the end. All the preceding code is just
1824 -- assertions and debugging output.
1826 pragma Assert
(No
(CU
) or else Nkind
(CU
) = N_Compilation_Unit
);
1828 case Nkind
(Item
) is
1829 when N_Generic_Function_Renaming_Declaration
1830 | N_Generic_Package_Declaration
1831 | N_Generic_Package_Renaming_Declaration
1832 | N_Generic_Procedure_Renaming_Declaration
1833 | N_Generic_Subprogram_Declaration
1834 | N_Package_Declaration
1835 | N_Package_Renaming_Declaration
1836 | N_Subprogram_Declaration
1837 | N_Subprogram_Renaming_Declaration
1843 when N_Package_Body
=>
1845 -- Package bodies are processed separately if the main unit
1850 when N_Subprogram_Body
=>
1852 -- A subprogram body must be the main unit
1854 pragma Assert
(Acts_As_Spec
(CU
) or else CU
= Main_CU
);
1857 when N_Function_Instantiation
1858 | N_Package_Instantiation
1859 | N_Procedure_Instantiation
1861 -- Can only happen if some generic body (needed for gnat2scil
1862 -- traversal, but not by GNAT) is not available, ignore.
1866 -- All other cases cannot happen
1869 pragma Assert
(False, "subunit");
1872 when N_Null_Statement
=>
1874 -- Do not call Action for an ignored ghost unit
1876 pragma Assert
(Is_Ignored_Ghost_Node
(Original_Node
(Item
)));
1880 pragma Assert
(False);
1884 if Present
(CU
) then
1885 pragma Assert
(Item
/= Stand
.Standard_Package_Node
);
1886 pragma Assert
(Item
= Unit
(CU
));
1889 Unit_Num
: constant Unit_Number_Type
:=
1890 Get_Cunit_Unit_Number
(CU
);
1892 procedure Assert_Done
(Withed_Unit
: Node_Id
);
1893 -- Assert Withed_Unit is already Done, unless it's a body. It
1894 -- might seem strange for a with_clause to refer to a body, but
1895 -- this happens in the case of a generic instantiation, which
1896 -- gets transformed into the instance body (and the instance
1897 -- spec is also created). With clauses pointing to the
1898 -- instantiation end up pointing to the instance body.
1904 procedure Assert_Done
(Withed_Unit
: Node_Id
) is
1906 if Withed_Unit
/= Main_CU
1907 and then not Done
(Get_Cunit_Unit_Number
(Withed_Unit
))
1909 -- N_Null_Statement will happen in case of a ghost unit
1910 -- which gets rewritten.
1912 if Nkind
(Unit
(Withed_Unit
)) not in
1913 N_Generic_Package_Declaration |
1915 N_Package_Renaming_Declaration |
1920 (Unit_Name
(Get_Cunit_Unit_Number
(Withed_Unit
)));
1921 Write_Str
(" not yet walked!");
1923 if Get_Cunit_Unit_Number
(Withed_Unit
) = Unit_Num
then
1924 Write_Str
(" (self-ref)");
1929 pragma Assert
(False);
1934 procedure Assert_Withed_Units_Done
is
1935 new Walk_Withs
(Assert_Done
);
1938 if Debug_Unit_Walk
then
1939 Write_Unit_Info
(Unit_Num
, Item
, Withs
=> True);
1942 -- Main unit should come last, except in the case where we
1943 -- skipped System_Aux_Id, in which case we missed the things it
1944 -- depends on, and in the case of parent bodies if present.
1947 (not Done
(Main_Unit
)
1948 or else Present
(System_Aux_Id
)
1949 or else Nkind
(Item
) = N_Package_Body
);
1951 -- We shouldn't do the same thing twice
1953 pragma Assert
(not Done
(Unit_Num
));
1955 -- Everything we depend upon should already be done
1958 (Assert_Withed_Units_Done
(CU
, Include_Limited
=> False));
1962 -- Must be Standard, which has no entry in the units table
1964 pragma Assert
(Item
= Stand
.Standard_Package_Node
);
1966 if Debug_Unit_Walk
then
1967 Write_Line
("Standard");
1974 --------------------
1975 -- Do_Withed_Unit --
1976 --------------------
1978 procedure Do_Withed_Unit
(Withed_Unit
: Node_Id
) is
1980 Do_Unit_And_Dependents
(Withed_Unit
, Unit
(Withed_Unit
));
1982 -- If the unit in the with_clause is a generic instance, the clause
1983 -- now denotes the instance body. Traverse the corresponding spec
1984 -- because there may be no other dependence that will force the
1985 -- traversal of its own context.
1987 if Nkind
(Unit
(Withed_Unit
)) = N_Package_Body
1988 and then Is_Generic_Instance
1989 (Defining_Entity
(Unit
(Library_Unit
(Withed_Unit
))))
1991 Do_Withed_Unit
(Library_Unit
(Withed_Unit
));
1995 ----------------------------
1996 -- Do_Unit_And_Dependents --
1997 ----------------------------
1999 procedure Do_Unit_And_Dependents
(CU
: Node_Id
; Item
: Node_Id
) is
2000 Unit_Num
: constant Unit_Number_Type
:= Get_Cunit_Unit_Number
(CU
);
2002 Body_U
: Unit_Number_Type
;
2003 Parent_CU
: Node_Id
;
2005 procedure Do_Withed_Units
is new Walk_Withs
(Do_Withed_Unit
);
2008 if not Seen
(Unit_Num
) then
2010 -- Process the with clauses
2012 Do_Withed_Units
(CU
, Include_Limited
=> False);
2014 -- Process the unit if it is a spec or the main unit, if it
2015 -- has no previous spec or we have done all other units.
2017 if Nkind
(Item
) not in N_Package_Body | N_Subprogram_Body
2018 or else Acts_As_Spec
(CU
)
2020 if CU
= Main_CU
and then not Do_Main
then
2021 Seen
(Unit_Num
) := False;
2024 Seen
(Unit_Num
) := True;
2026 if CU
= Library_Unit
(Main_CU
) then
2027 Process_Bodies_In_Context
(CU
);
2029 -- If main is a child unit, examine parent unit contexts
2030 -- to see if they include instantiated units. Also, if
2031 -- the parent itself is an instance, process its body
2032 -- because it may contain subprograms that are called
2033 -- in the main unit.
2035 if Is_Child_Unit
(Cunit_Entity
(Main_Unit
)) then
2036 Child
:= Cunit_Entity
(Main_Unit
);
2037 while Is_Child_Unit
(Child
) loop
2040 (Get_Cunit_Entity_Unit_Number
(Scope
(Child
)));
2041 Process_Bodies_In_Context
(Parent_CU
);
2043 if Nkind
(Unit
(Parent_CU
)) = N_Package_Body
2045 Nkind
(Original_Node
(Unit
(Parent_CU
)))
2046 = N_Package_Instantiation
2048 not Seen
(Get_Cunit_Unit_Number
(Parent_CU
))
2050 Body_U
:= Get_Cunit_Unit_Number
(Parent_CU
);
2051 Seen
(Body_U
) := True;
2052 Do_Action
(Parent_CU
, Unit
(Parent_CU
));
2053 Done
(Body_U
) := True;
2056 Child
:= Scope
(Child
);
2061 Do_Action
(CU
, Item
);
2062 Done
(Unit_Num
) := True;
2066 end Do_Unit_And_Dependents
;
2068 -------------------------------
2069 -- Process_Bodies_In_Context --
2070 -------------------------------
2072 procedure Process_Bodies_In_Context
(Comp
: Node_Id
) is
2074 Body_U
: Unit_Number_Type
;
2078 procedure Do_Withed_Units
is new Walk_Withs
(Do_Withed_Unit
);
2080 -- Start of processing for Process_Bodies_In_Context
2083 Clause
:= First
(Context_Items
(Comp
));
2084 while Present
(Clause
) loop
2085 if Nkind
(Clause
) = N_With_Clause
then
2086 Spec
:= Library_Unit
(Clause
);
2087 Body_CU
:= Library_Unit
(Spec
);
2089 -- If we are processing the spec of the main unit, load bodies
2090 -- only if the with_clause indicates that it forced the loading
2091 -- of the body for a generic instantiation. Note that bodies of
2092 -- parents that are instances have been loaded already.
2094 if Present
(Body_CU
)
2095 and then Body_CU
/= Main_CU
2096 and then Nkind
(Unit
(Body_CU
)) /= N_Subprogram_Body
2097 and then Nkind
(Unit
(Comp
)) /= N_Package_Declaration
2099 Body_U
:= Get_Cunit_Unit_Number
(Body_CU
);
2101 if not Seen
(Body_U
)
2102 and then not Depends_On_Main
(Body_CU
)
2104 Seen
(Body_U
) := True;
2105 Do_Withed_Units
(Body_CU
, Include_Limited
=> False);
2106 Do_Action
(Body_CU
, Unit
(Body_CU
));
2107 Done
(Body_U
) := True;
2114 end Process_Bodies_In_Context
;
2116 -- Local Declarations
2120 -- Start of processing for Walk_Library_Items
2123 if Debug_Unit_Walk
then
2124 Write_Line
("Walk_Library_Items:");
2128 -- Do Standard first, then walk the Comp_Unit_List
2130 Do_Action
(Empty
, Standard_Package_Node
);
2132 -- First place the context of all instance bodies on the corresponding
2133 -- spec, because it may be needed to analyze the code at the place of
2134 -- the instantiation.
2136 Cur
:= First_Elmt
(Comp_Unit_List
);
2137 while Present
(Cur
) loop
2139 CU
: constant Node_Id
:= Node
(Cur
);
2140 N
: constant Node_Id
:= Unit
(CU
);
2143 if Nkind
(N
) = N_Package_Body
2144 and then Is_Generic_Instance
(Defining_Entity
(N
))
2147 (Context_Items
(CU
), Context_Items
(Library_Unit
(CU
)));
2154 -- Now traverse compilation units (specs) in order
2156 Cur
:= First_Elmt
(Comp_Unit_List
);
2157 while Present
(Cur
) loop
2159 CU
: constant Node_Id
:= Node
(Cur
);
2160 N
: constant Node_Id
:= Unit
(CU
);
2164 pragma Assert
(Nkind
(CU
) = N_Compilation_Unit
);
2168 -- If it is a subprogram body, process it if it has no
2171 -- If it's a package body, ignore it, unless it is a body
2172 -- created for an instance that is the main unit. In the case
2173 -- of subprograms, the body is the wrapper package. In case of
2174 -- a package, the original file carries the body, and the spec
2175 -- appears as a later entry in the units list.
2177 -- Otherwise bodies appear in the list only because of inlining
2178 -- or instantiations, and they are processed only if relevant.
2179 -- The flag Withed_Body on a context clause indicates that a
2180 -- unit contains an instantiation that may be needed later,
2181 -- and therefore the body that contains the generic body (and
2182 -- its context) must be traversed immediately after the
2183 -- corresponding spec (see Do_Unit_And_Dependents).
2185 -- The main unit itself is processed separately after all other
2186 -- specs, and relevant bodies are examined in Process_Main.
2188 when N_Subprogram_Body
=>
2189 if Acts_As_Spec
(N
) then
2190 Do_Unit_And_Dependents
(CU
, N
);
2193 when N_Package_Body
=>
2195 and then Nkind
(Original_Node
(Unit
(Main_CU
))) in
2196 N_Generic_Instantiation
2197 and then Present
(Library_Unit
(Main_CU
))
2199 Do_Unit_And_Dependents
2200 (Library_Unit
(Main_CU
),
2201 Unit
(Library_Unit
(Main_CU
)));
2204 -- It is a spec, process it, and the units it depends on,
2205 -- unless it is a descendant of the main unit. This can happen
2206 -- when the body of a parent depends on some other descendant.
2208 when N_Null_Statement
=>
2210 -- Ignore an ignored ghost unit
2212 pragma Assert
(Is_Ignored_Ghost_Node
(Original_Node
(N
)));
2217 -- Skip spec of main unit for now, we want to process it
2218 -- after all other specs.
2220 if Nkind
(Unit
(CU
)) = N_Package_Declaration
2221 and then Library_Unit
(CU
) = Main_CU
2222 and then CU
/= Main_CU
2226 Par
:= Scope
(Defining_Entity
(Unit
(CU
)));
2228 if Is_Child_Unit
(Defining_Entity
(Unit
(CU
))) then
2230 and then Par
/= Standard_Standard
2231 and then Par
/= Cunit_Entity
(Main_Unit
)
2237 if Par
/= Cunit_Entity
(Main_Unit
) then
2238 Do_Unit_And_Dependents
(CU
, N
);
2247 -- Now process main package spec if skipped
2249 if Present
(Spec_CU
) then
2250 Do_Unit_And_Dependents
(Spec_CU
, Unit
(Spec_CU
));
2253 -- Now process package bodies on which main depends, followed by bodies
2254 -- of parents, if present, and finally main itself.
2256 if not Done
(Main_Unit
) then
2259 Process_Main
: declare
2260 Parent_CU
: Node_Id
;
2262 Body_U
: Unit_Number_Type
;
2265 function Is_Subunit_Of_Main
(U
: Node_Id
) return Boolean;
2266 -- If the main unit has subunits, their context may include
2267 -- bodies that are needed in the body of main. We must examine
2268 -- the context of the subunits, which are otherwise not made
2269 -- explicit in the main unit.
2271 ------------------------
2272 -- Is_Subunit_Of_Main --
2273 ------------------------
2275 function Is_Subunit_Of_Main
(U
: Node_Id
) return Boolean is
2279 if Present
(U
) and then Nkind
(Unit
(U
)) = N_Subunit
then
2280 Lib
:= Library_Unit
(U
);
2281 return Lib
= Main_CU
or else Is_Subunit_Of_Main
(Lib
);
2285 end Is_Subunit_Of_Main
;
2287 -- Start of processing for Process_Main
2290 Process_Bodies_In_Context
(Main_CU
);
2292 for Unit_Num
in Done
'Range loop
2293 if Is_Subunit_Of_Main
(Cunit
(Unit_Num
)) then
2294 Process_Bodies_In_Context
(Cunit
(Unit_Num
));
2298 -- If the main unit is a child unit, parent bodies may be present
2299 -- because they export instances or inlined subprograms. Check for
2300 -- presence of these, which are not present in context clauses.
2301 -- Note that if the parents are instances, their bodies have been
2302 -- processed before the main spec, because they may be needed
2303 -- therein, so the following loop only affects non-instances.
2305 if Is_Child_Unit
(Cunit_Entity
(Main_Unit
)) then
2306 Child
:= Cunit_Entity
(Main_Unit
);
2307 while Is_Child_Unit
(Child
) loop
2309 Cunit
(Get_Cunit_Entity_Unit_Number
(Scope
(Child
)));
2310 Body_CU
:= Library_Unit
(Parent_CU
);
2312 if Present
(Body_CU
)
2313 and then not Seen
(Get_Cunit_Unit_Number
(Body_CU
))
2314 and then not Depends_On_Main
(Body_CU
)
2316 Body_U
:= Get_Cunit_Unit_Number
(Body_CU
);
2317 Seen
(Body_U
) := True;
2318 Do_Action
(Body_CU
, Unit
(Body_CU
));
2319 Done
(Body_U
) := True;
2322 Child
:= Scope
(Child
);
2326 Do_Action
(Main_CU
, Unit
(Main_CU
));
2327 Done
(Main_Unit
) := True;
2331 if Debug_Unit_Walk
then
2332 if Done
/= (Done
'Range => True) then
2334 Write_Line
("Ignored units:");
2338 for Unit_Num
in Done
'Range loop
2339 if not Done
(Unit_Num
) then
2341 -- Units with configuration pragmas (.ads files) have empty
2342 -- compilation-unit nodes; skip printing info about them.
2344 if Present
(Cunit
(Unit_Num
)) then
2346 (Unit_Num
, Unit
(Cunit
(Unit_Num
)), Withs
=> True);
2355 pragma Assert
(Done
(Main_Unit
));
2357 if Debug_Unit_Walk
then
2359 Write_Line
("end Walk_Library_Items.");
2361 end Walk_Library_Items
;
2367 procedure Walk_Withs
(CU
: Node_Id
; Include_Limited
: Boolean) is
2368 pragma Assert
(Nkind
(CU
) = N_Compilation_Unit
);
2369 pragma Assert
(Nkind
(Unit
(CU
)) /= N_Subunit
);
2371 procedure Walk_Immediate
is new Walk_Withs_Immediate
(Action
);
2374 -- First walk the withs immediately on the library item
2376 Walk_Immediate
(CU
, Include_Limited
);
2378 -- For a body, we must also check for any subunits which belong to it
2379 -- and which have context clauses of their own, since these with'ed
2380 -- units are part of its own dependencies.
2382 if Nkind
(Unit
(CU
)) in N_Unit_Body
then
2383 for S
in Main_Unit
.. Last_Unit
loop
2385 -- We are only interested in subunits. For preproc. data and def.
2386 -- files, Cunit is Empty, so we need to test that first.
2388 if Cunit
(S
) /= Empty
2389 and then Nkind
(Unit
(Cunit
(S
))) = N_Subunit
2395 Pnode
:= Library_Unit
(Cunit
(S
));
2397 -- In -gnatc mode, the errors in the subunits will not have
2398 -- been recorded, but the analysis of the subunit may have
2399 -- failed, so just quit.
2405 -- Find ultimate parent of the subunit
2407 while Nkind
(Unit
(Pnode
)) = N_Subunit
loop
2408 Pnode
:= Library_Unit
(Pnode
);
2411 -- See if it belongs to current unit, and if so, include its
2412 -- with_clauses. Do not process main unit prematurely.
2414 if Pnode
= CU
and then CU
/= Cunit
(Main_Unit
) then
2415 Walk_Immediate
(Cunit
(S
), Include_Limited
);
2423 --------------------------
2424 -- Walk_Withs_Immediate --
2425 --------------------------
2427 procedure Walk_Withs_Immediate
(CU
: Node_Id
; Include_Limited
: Boolean) is
2428 pragma Assert
(Nkind
(CU
) = N_Compilation_Unit
);
2430 Context_Item
: Node_Id
;
2434 Context_Item
:= First
(Context_Items
(CU
));
2435 while Present
(Context_Item
) loop
2436 if Nkind
(Context_Item
) = N_With_Clause
2437 and then (Include_Limited
2438 or else not Limited_Present
(Context_Item
))
2440 Lib_Unit
:= Library_Unit
(Context_Item
);
2444 Next
(Context_Item
);
2446 end Walk_Withs_Immediate
;