1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2018, 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 -- This package contains the routines to process package specifications and
27 -- bodies. The most important semantic aspects of package processing are the
28 -- handling of private and full declarations, and the construction of dispatch
29 -- tables for tagged types.
31 with Aspects
; use Aspects
;
32 with Atree
; use Atree
;
33 with Contracts
; use Contracts
;
34 with Debug
; use Debug
;
35 with Einfo
; use Einfo
;
36 with Elists
; use Elists
;
37 with Errout
; use Errout
;
38 with Exp_Disp
; use Exp_Disp
;
39 with Exp_Dist
; use Exp_Dist
;
40 with Exp_Dbug
; use Exp_Dbug
;
41 with Freeze
; use Freeze
;
42 with Ghost
; use Ghost
;
44 with Lib
.Xref
; use Lib
.Xref
;
45 with Namet
; use Namet
;
46 with Nmake
; use Nmake
;
47 with Nlists
; use Nlists
;
49 with Output
; use Output
;
50 with Restrict
; use Restrict
;
51 with Rtsfind
; use Rtsfind
;
53 with Sem_Aux
; use Sem_Aux
;
54 with Sem_Cat
; use Sem_Cat
;
55 with Sem_Ch3
; use Sem_Ch3
;
56 with Sem_Ch6
; use Sem_Ch6
;
57 with Sem_Ch8
; use Sem_Ch8
;
58 with Sem_Ch10
; use Sem_Ch10
;
59 with Sem_Ch12
; use Sem_Ch12
;
60 with Sem_Ch13
; use Sem_Ch13
;
61 with Sem_Disp
; use Sem_Disp
;
62 with Sem_Eval
; use Sem_Eval
;
63 with Sem_Prag
; use Sem_Prag
;
64 with Sem_Util
; use Sem_Util
;
65 with Sem_Warn
; use Sem_Warn
;
66 with Snames
; use Snames
;
67 with Stand
; use Stand
;
68 with Sinfo
; use Sinfo
;
69 with Sinput
; use Sinput
;
71 with Uintp
; use Uintp
;
75 package body Sem_Ch7
is
77 -----------------------------------
78 -- Handling private declarations --
79 -----------------------------------
81 -- The principle that each entity has a single defining occurrence clashes
82 -- with the presence of two separate definitions for private types: the
83 -- first is the private type declaration, and the second is the full type
84 -- declaration. It is important that all references to the type point to
85 -- the same defining occurrence, namely the first one. To enforce the two
86 -- separate views of the entity, the corresponding information is swapped
87 -- between the two declarations. Outside of the package, the defining
88 -- occurrence only contains the private declaration information, while in
89 -- the private part and the body of the package the defining occurrence
90 -- contains the full declaration. To simplify the swap, the defining
91 -- occurrence that currently holds the private declaration points to the
92 -- full declaration. During semantic processing the defining occurrence
93 -- also points to a list of private dependents, that is to say access types
94 -- or composite types whose designated types or component types are
95 -- subtypes or derived types of the private type in question. After the
96 -- full declaration has been seen, the private dependents are updated to
97 -- indicate that they have full definitions.
99 -----------------------
100 -- Local Subprograms --
101 -----------------------
103 procedure Analyze_Package_Body_Helper
(N
: Node_Id
);
104 -- Does all the real work of Analyze_Package_Body
106 procedure Check_Anonymous_Access_Types
107 (Spec_Id
: Entity_Id
;
109 -- If the spec of a package has a limited_with_clause, it may declare
110 -- anonymous access types whose designated type is a limited view, such an
111 -- anonymous access return type for a function. This access type cannot be
112 -- elaborated in the spec itself, but it may need an itype reference if it
113 -- is used within a nested scope. In that case the itype reference is
114 -- created at the beginning of the corresponding package body and inserted
115 -- before other body declarations.
117 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
118 -- Called upon entering the private part of a public child package and the
119 -- body of a nested package, to potentially declare certain inherited
120 -- subprograms that were inherited by types in the visible part, but whose
121 -- declaration was deferred because the parent operation was private and
122 -- not visible at that point. These subprograms are located by traversing
123 -- the visible part declarations looking for non-private type extensions
124 -- and then examining each of the primitive operations of such types to
125 -- find those that were inherited but declared with a special internal
126 -- name. Each such operation is now declared as an operation with a normal
127 -- name (using the name of the parent operation) and replaces the previous
128 -- implicit operation in the primitive operations list of the type. If the
129 -- inherited private operation has been overridden, then it's replaced by
130 -- the overriding operation.
132 procedure Install_Package_Entity
(Id
: Entity_Id
);
133 -- Supporting procedure for Install_{Visible,Private}_Declarations. Places
134 -- one entity on its visibility chain, and recurses on the visible part if
135 -- the entity is an inner package.
137 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
138 -- True for a private type that is not a subtype
140 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
141 -- If the private dependent is a private type whose full view is derived
142 -- from the parent type, its full properties are revealed only if we are in
143 -- the immediate scope of the private dependent. Should this predicate be
144 -- tightened further???
146 function Requires_Completion_In_Body
149 Do_Abstract_States
: Boolean := False) return Boolean;
150 -- Subsidiary to routines Unit_Requires_Body and Unit_Requires_Body_Info.
151 -- Determine whether entity Id declared in package spec Pack_Id requires
152 -- completion in a package body. Flag Do_Abstract_Stats should be set when
153 -- abstract states are to be considered in the completion test.
155 procedure Unit_Requires_Body_Info
(Pack_Id
: Entity_Id
);
156 -- Outputs info messages showing why package Pack_Id requires a body. The
157 -- caller has checked that the switch requesting this information is set,
158 -- and that the package does indeed require a body.
160 --------------------------
161 -- Analyze_Package_Body --
162 --------------------------
164 procedure Analyze_Package_Body
(N
: Node_Id
) is
165 Loc
: constant Source_Ptr
:= Sloc
(N
);
169 Write_Str
("==> package body ");
170 Write_Name
(Chars
(Defining_Entity
(N
)));
171 Write_Str
(" from ");
172 Write_Location
(Loc
);
177 -- The real work is split out into the helper, so it can do "return;"
178 -- without skipping the debug output.
180 Analyze_Package_Body_Helper
(N
);
184 Write_Str
("<== package body ");
185 Write_Name
(Chars
(Defining_Entity
(N
)));
186 Write_Str
(" from ");
187 Write_Location
(Loc
);
190 end Analyze_Package_Body
;
192 ------------------------------------------------------
193 -- Analyze_Package_Body_Helper Data and Subprograms --
194 ------------------------------------------------------
196 Entity_Table_Size
: constant := 4093;
197 -- Number of headers in hash table
199 subtype Entity_Header_Num
is Integer range 0 .. Entity_Table_Size
- 1;
200 -- Range of headers in hash table
202 function Node_Hash
(Id
: Entity_Id
) return Entity_Header_Num
;
203 -- Simple hash function for Entity_Ids
205 package Subprogram_Table
is new GNAT
.Htable
.Simple_HTable
206 (Header_Num
=> Entity_Header_Num
,
212 -- Hash table to record which subprograms are referenced. It is declared
213 -- at library level to avoid elaborating it for every call to Analyze.
215 package Traversed_Table
is new GNAT
.Htable
.Simple_HTable
216 (Header_Num
=> Entity_Header_Num
,
222 -- Hash table to record which nodes we have traversed, so we can avoid
223 -- traversing the same nodes repeatedly.
229 function Node_Hash
(Id
: Entity_Id
) return Entity_Header_Num
is
231 return Entity_Header_Num
(Id
mod Entity_Table_Size
);
234 ---------------------------------
235 -- Analyze_Package_Body_Helper --
236 ---------------------------------
238 -- WARNING: This routine manages Ghost regions. Return statements must be
239 -- replaced by gotos which jump to the end of the routine and restore the
242 procedure Analyze_Package_Body_Helper
(N
: Node_Id
) is
243 procedure Hide_Public_Entities
(Decls
: List_Id
);
244 -- Attempt to hide all public entities found in declarative list Decls
245 -- by resetting their Is_Public flag to False depending on whether the
246 -- entities are not referenced by inlined or generic bodies. This kind
247 -- of processing is a conservative approximation and will still leave
248 -- entities externally visible if the package is not simple enough.
250 procedure Install_Composite_Operations
(P
: Entity_Id
);
251 -- Composite types declared in the current scope may depend on types
252 -- that were private at the point of declaration, and whose full view
253 -- is now in scope. Indicate that the corresponding operations on the
254 -- composite type are available.
256 --------------------------
257 -- Hide_Public_Entities --
258 --------------------------
260 procedure Hide_Public_Entities
(Decls
: List_Id
) is
261 function Has_Referencer
263 In_Nested_Instance
: Boolean;
264 Has_Outer_Referencer_Of_Non_Subprograms
: Boolean) return Boolean;
265 -- A "referencer" is a construct which may reference a previous
266 -- declaration. Examine all declarations in list Decls in reverse
267 -- and determine whether one such referencer exists. All entities
268 -- in the range Last (Decls) .. Referencer are hidden from external
271 function Scan_Subprogram_Ref
(N
: Node_Id
) return Traverse_Result
;
272 -- Determine whether a node denotes a reference to a subprogram
274 procedure Traverse_And_Scan_Subprogram_Refs
is
275 new Traverse_Proc
(Scan_Subprogram_Ref
);
276 -- Subsidiary to routine Has_Referencer. Determine whether a node
277 -- contains references to a subprogram and record them.
278 -- WARNING: this is a very expensive routine as it performs a full
281 procedure Scan_Subprogram_Refs
(Node
: Node_Id
);
282 -- If we haven't already traversed Node, then mark it and traverse
289 function Has_Referencer
291 In_Nested_Instance
: Boolean;
292 Has_Outer_Referencer_Of_Non_Subprograms
: Boolean) return Boolean
298 Has_Referencer_Of_Non_Subprograms
: Boolean :=
299 Has_Outer_Referencer_Of_Non_Subprograms
;
300 -- Set if an inlined subprogram body was detected as a referencer.
301 -- In this case, we do not return True immediately but keep hiding
302 -- subprograms from external visibility.
309 -- Examine all declarations in reverse order, hiding all entities
310 -- from external visibility until a referencer has been found. The
311 -- algorithm recurses into nested packages.
313 Decl
:= Last
(Decls
);
314 while Present
(Decl
) loop
316 -- A stub is always considered a referencer
318 if Nkind
(Decl
) in N_Body_Stub
then
321 -- Package declaration
323 elsif Nkind
(Decl
) = N_Package_Declaration
then
324 Spec
:= Specification
(Decl
);
325 Decl_Id
:= Defining_Entity
(Spec
);
327 -- Inspect the declarations of a non-generic package to try
328 -- and hide more entities from external visibility.
330 if not Is_Generic_Unit
(Decl_Id
) then
331 if Has_Referencer
(Private_Declarations
(Spec
),
334 Is_Generic_Instance
(Decl_Id
),
335 Has_Referencer_Of_Non_Subprograms
)
337 Has_Referencer
(Visible_Declarations
(Spec
),
340 Is_Generic_Instance
(Decl_Id
),
341 Has_Referencer_Of_Non_Subprograms
)
349 elsif Nkind
(Decl
) = N_Package_Body
350 and then Present
(Corresponding_Spec
(Decl
))
352 Decl_Id
:= Corresponding_Spec
(Decl
);
354 -- A generic package body is a referencer. It would seem
355 -- that we only have to consider generics that can be
356 -- exported, i.e. where the corresponding spec is the
357 -- spec of the current package, but because of nested
358 -- instantiations, a fully private generic body may export
359 -- other private body entities. Furthermore, regardless of
360 -- whether there was a previous inlined subprogram, (an
361 -- instantiation of) the generic package may reference any
362 -- entity declared before it.
364 if Is_Generic_Unit
(Decl_Id
) then
367 -- Inspect the declarations of a non-generic package body to
368 -- try and hide more entities from external visibility.
370 elsif Has_Referencer
(Declarations
(Decl
),
373 Is_Generic_Instance
(Decl_Id
),
374 Has_Referencer_Of_Non_Subprograms
)
381 elsif Nkind
(Decl
) = N_Subprogram_Body
then
382 if Present
(Corresponding_Spec
(Decl
)) then
383 Decl_Id
:= Corresponding_Spec
(Decl
);
385 -- A generic subprogram body acts as a referencer
387 if Is_Generic_Unit
(Decl_Id
) then
391 -- An inlined subprogram body acts as a referencer
393 -- Note that we test Has_Pragma_Inline here in addition
394 -- to Is_Inlined. We are doing this for a client, since
395 -- we are computing which entities should be public, and
396 -- it is the client who will decide if actual inlining
397 -- should occur, so we need to catch all cases where the
398 -- subprogram may be inlined by the client.
400 if Is_Inlined
(Decl_Id
)
401 or else Has_Pragma_Inline
(Decl_Id
)
403 Has_Referencer_Of_Non_Subprograms
:= True;
405 -- Inspect the statements of the subprogram body
406 -- to determine whether the body references other
409 Scan_Subprogram_Refs
(Decl
);
412 -- Otherwise this is a stand alone subprogram body
415 Decl_Id
:= Defining_Entity
(Decl
);
417 -- An inlined subprogram body acts as a referencer
419 if Is_Inlined
(Decl_Id
)
420 or else Has_Pragma_Inline
(Decl_Id
)
422 Has_Referencer_Of_Non_Subprograms
:= True;
424 -- Inspect the statements of the subprogram body
425 -- to determine whether the body references other
428 Scan_Subprogram_Refs
(Decl
);
430 -- Otherwise we can reset Is_Public right away
432 elsif not Subprogram_Table
.Get
(Decl_Id
) then
433 Set_Is_Public
(Decl_Id
, False);
439 elsif Nkind
(Decl
) = N_Freeze_Entity
then
442 pragma Unreferenced
(Discard
);
444 -- Inspect the actions to find references to subprograms.
445 -- We assume that the actions do not contain other kinds
446 -- of references and, therefore, we do not stop the scan
447 -- or set Has_Referencer_Of_Non_Subprograms here. Doing
448 -- it would pessimize common cases for which the actions
449 -- contain the declaration of an init procedure, since
450 -- such a procedure is automatically marked inline.
453 Has_Referencer
(Actions
(Decl
),
455 Has_Referencer_Of_Non_Subprograms
);
458 -- Exceptions, objects and renamings do not need to be public
459 -- if they are not followed by a construct which can reference
460 -- and export them. Likewise for subprograms but we work harder
461 -- for them to see whether they are referenced on an individual
462 -- basis by looking into the table of referenced subprograms.
463 -- But we cannot say anything for entities declared in nested
464 -- instances because instantiations are not done yet so the
465 -- bodies are not visible and could contain references to them.
466 elsif Nkind_In
(Decl
, N_Exception_Declaration
,
467 N_Object_Declaration
,
468 N_Object_Renaming_Declaration
,
469 N_Subprogram_Declaration
,
470 N_Subprogram_Renaming_Declaration
)
472 Decl_Id
:= Defining_Entity
(Decl
);
474 if not In_Nested_Instance
475 and then not Is_Imported
(Decl_Id
)
476 and then not Is_Exported
(Decl_Id
)
477 and then No
(Interface_Name
(Decl_Id
))
479 ((Nkind
(Decl
) /= N_Subprogram_Declaration
480 and then not Has_Referencer_Of_Non_Subprograms
)
481 or else (Nkind
(Decl
) = N_Subprogram_Declaration
482 and then not Subprogram_Table
.Get
(Decl_Id
)))
484 Set_Is_Public
(Decl_Id
, False);
487 -- For a subprogram renaming, if the entity is referenced,
488 -- then so is the renamed subprogram. But there is an issue
489 -- with generic bodies because instantiations are not done
490 -- yet and, therefore, cannot be scanned for referencers.
491 -- That's why we use an approximation and test that we have
492 -- at least one subprogram referenced by an inlined body
493 -- instead of precisely the entity of this renaming.
495 if Nkind
(Decl
) = N_Subprogram_Renaming_Declaration
496 and then Subprogram_Table
.Get_First
497 and then Is_Entity_Name
(Name
(Decl
))
498 and then Present
(Entity
(Name
(Decl
)))
499 and then Is_Subprogram
(Entity
(Name
(Decl
)))
501 Subprogram_Table
.Set
(Entity
(Name
(Decl
)), True);
508 return Has_Referencer_Of_Non_Subprograms
;
511 -------------------------
512 -- Scan_Subprogram_Ref --
513 -------------------------
515 function Scan_Subprogram_Ref
(N
: Node_Id
) return Traverse_Result
is
517 -- Detect a reference of the form
520 if Nkind
(N
) in N_Subprogram_Call
521 and then Is_Entity_Name
(Name
(N
))
522 and then Present
(Entity
(Name
(N
)))
523 and then Is_Subprogram
(Entity
(Name
(N
)))
525 Subprogram_Table
.Set
(Entity
(Name
(N
)), True);
527 -- Detect a reference of the form
528 -- Subp'Some_Attribute
530 elsif Nkind
(N
) = N_Attribute_Reference
531 and then Is_Entity_Name
(Prefix
(N
))
532 and then Present
(Entity
(Prefix
(N
)))
533 and then Is_Subprogram
(Entity
(Prefix
(N
)))
535 Subprogram_Table
.Set
(Entity
(Prefix
(N
)), True);
537 -- Constants can be substituted by their value in gigi, which may
538 -- contain a reference, so scan the value recursively.
540 elsif Is_Entity_Name
(N
)
541 and then Present
(Entity
(N
))
542 and then Ekind
(Entity
(N
)) = E_Constant
545 Val
: constant Node_Id
:= Constant_Value
(Entity
(N
));
548 and then not Compile_Time_Known_Value
(Val
)
550 Scan_Subprogram_Refs
(Val
);
556 end Scan_Subprogram_Ref
;
558 --------------------------
559 -- Scan_Subprogram_Refs --
560 --------------------------
562 procedure Scan_Subprogram_Refs
(Node
: Node_Id
) is
564 if not Traversed_Table
.Get
(Node
) then
565 Traversed_Table
.Set
(Node
, True);
566 Traverse_And_Scan_Subprogram_Refs
(Node
);
568 end Scan_Subprogram_Refs
;
573 pragma Unreferenced
(Discard
);
575 -- Start of processing for Hide_Public_Entities
578 -- The algorithm examines the top level declarations of a package
579 -- body in reverse looking for a construct that may export entities
580 -- declared prior to it. If such a scenario is encountered, then all
581 -- entities in the range Last (Decls) .. construct are hidden from
582 -- external visibility. Consider:
590 -- package body Pack is
591 -- External_Obj : ...; -- (1)
593 -- package body Gen is -- (2)
594 -- ... External_Obj ... -- (3)
597 -- Local_Obj : ...; -- (4)
600 -- In this example Local_Obj (4) must not be externally visible as
601 -- it cannot be exported by anything in Pack. The body of generic
602 -- package Gen (2) on the other hand acts as a "referencer" and may
603 -- export anything declared before it. Since the compiler does not
604 -- perform flow analysis, it is not possible to determine precisely
605 -- which entities will be exported when Gen is instantiated. In the
606 -- example above External_Obj (1) is exported at (3), but this may
607 -- not always be the case. The algorithm takes a conservative stance
608 -- and leaves entity External_Obj public.
610 -- This very conservative algorithm is supplemented by a more precise
611 -- processing for inlined bodies. For them, we traverse the syntactic
612 -- tree and record which subprograms are actually referenced from it.
613 -- This makes it possible to compute a much smaller set of externally
614 -- visible subprograms in the absence of generic bodies, which can
615 -- have a significant impact on the inlining decisions made in the
616 -- back end and the removal of out-of-line bodies from the object
617 -- code. We do it only for inlined bodies because they are supposed
618 -- to be reasonably small and tree traversal is very expensive.
620 -- Note that even this special processing is not optimal for inlined
621 -- bodies, because we treat all inlined subprograms alike. An optimal
622 -- algorithm would require computing the transitive closure of the
623 -- inlined subprograms that can really be referenced from other units
624 -- in the source code.
626 -- We could extend this processing for inlined bodies and record all
627 -- entities, not just subprograms, referenced from them, which would
628 -- make it possible to compute a much smaller set of all externally
629 -- visible entities in the absence of generic bodies. But this would
630 -- mean implementing a more thorough tree traversal of the bodies,
631 -- i.e. not just syntactic, and the gain would very likely be worth
632 -- neither the hassle nor the slowdown of the compiler.
634 -- Finally, an important thing to be aware of is that, at this point,
635 -- instantiations are not done yet so we cannot directly see inlined
636 -- bodies coming from them. That's not catastrophic because only the
637 -- actual parameters of the instantiations matter here, and they are
638 -- present in the declarations list of the instantiated packages.
640 Traversed_Table
.Reset
;
641 Subprogram_Table
.Reset
;
642 Discard
:= Has_Referencer
(Decls
, False, False);
643 end Hide_Public_Entities
;
645 ----------------------------------
646 -- Install_Composite_Operations --
647 ----------------------------------
649 procedure Install_Composite_Operations
(P
: Entity_Id
) is
653 Id
:= First_Entity
(P
);
654 while Present
(Id
) loop
656 and then (Is_Limited_Composite
(Id
)
657 or else Is_Private_Composite
(Id
))
658 and then No
(Private_Component
(Id
))
660 Set_Is_Limited_Composite
(Id
, False);
661 Set_Is_Private_Composite
(Id
, False);
666 end Install_Composite_Operations
;
670 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
671 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
672 Saved_ISMP
: constant Boolean :=
673 Ignore_SPARK_Mode_Pragmas_In_Instance
;
674 -- Save the Ghost and SPARK mode-related data to restore on exit
678 Last_Spec_Entity
: Entity_Id
;
683 -- Start of processing for Analyze_Package_Body_Helper
686 -- Find corresponding package specification, and establish the current
687 -- scope. The visible defining entity for the package is the defining
688 -- occurrence in the spec. On exit from the package body, all body
689 -- declarations are attached to the defining entity for the body, but
690 -- the later is never used for name resolution. In this fashion there
691 -- is only one visible entity that denotes the package.
693 -- Set Body_Id. Note that this will be reset to point to the generic
694 -- copy later on in the generic case.
696 Body_Id
:= Defining_Entity
(N
);
698 -- Body is body of package instantiation. Corresponding spec has already
701 if Present
(Corresponding_Spec
(N
)) then
702 Spec_Id
:= Corresponding_Spec
(N
);
703 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
706 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
709 and then Is_Package_Or_Generic_Package
(Spec_Id
)
711 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
713 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
714 Error_Msg_N
("cannot supply body for package renaming", N
);
717 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
718 Error_Msg_N
("redefinition of package body", N
);
723 Error_Msg_N
("missing specification for package body", N
);
727 if Is_Package_Or_Generic_Package
(Spec_Id
)
728 and then (Scope
(Spec_Id
) = Standard_Standard
729 or else Is_Child_Unit
(Spec_Id
))
730 and then not Unit_Requires_Body
(Spec_Id
)
732 if Ada_Version
= Ada_83
then
734 ("optional package body (not allowed in Ada 95)??", N
);
736 Error_Msg_N
("spec of this package does not allow a body", N
);
741 -- A [generic] package body freezes the contract of the nearest
742 -- enclosing package body and all other contracts encountered in
743 -- the same declarative part up to and excluding the package body:
745 -- package body Nearest_Enclosing_Package
746 -- with Refined_State => (State => Constit)
750 -- package body Freezes_Enclosing_Package_Body
751 -- with Refined_State => (State_2 => Constit_2)
756 -- with Refined_Depends => (Input => (Constit, Constit_2)) ...
758 -- This ensures that any annotations referenced by the contract of a
759 -- [generic] subprogram body declared within the current package body
760 -- are available. This form of freezing is decoupled from the usual
761 -- Freeze_xxx mechanism because it must also work in the context of
762 -- generics where normal freezing is disabled.
764 -- Only bodies coming from source should cause this type of freezing.
765 -- Instantiated generic bodies are excluded because their processing is
766 -- performed in a separate compilation pass which lacks enough semantic
767 -- information with respect to contract analysis. It is safe to suppress
768 -- the freezing of contracts in this case because this action already
769 -- took place at the end of the enclosing declarative part.
771 if Comes_From_Source
(N
)
772 and then not Is_Generic_Instance
(Spec_Id
)
774 Freeze_Previous_Contracts
(N
);
777 -- A package body is Ghost when the corresponding spec is Ghost. Set
778 -- the mode now to ensure that any nodes generated during analysis and
779 -- expansion are properly flagged as ignored Ghost.
781 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
783 -- If the body completes the initial declaration of a compilation unit
784 -- which is subject to pragma Elaboration_Checks, set the model of the
785 -- pragma because it applies to all parts of the unit.
787 Install_Elaboration_Model
(Spec_Id
);
789 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
790 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
792 if Is_Child_Unit
(Spec_Id
) then
793 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
795 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
798 Set_Is_Child_Unit
(Body_Id
);
801 -- Generic package case
803 if Ekind
(Spec_Id
) = E_Generic_Package
then
805 -- Disable expansion and perform semantic analysis on copy. The
806 -- unannotated body will be used in all instantiations.
808 Body_Id
:= Defining_Entity
(N
);
809 Set_Ekind
(Body_Id
, E_Package_Body
);
810 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
811 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
812 Set_Body_Entity
(Spec_Id
, Body_Id
);
813 Set_Spec_Entity
(Body_Id
, Spec_Id
);
815 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
818 -- Once the contents of the generic copy and the template are
819 -- swapped, do the same for their respective aspect specifications.
821 Exchange_Aspects
(N
, New_N
);
823 -- Collect all contract-related source pragmas found within the
824 -- template and attach them to the contract of the package body.
825 -- This contract is used in the capture of global references within
828 Create_Generic_Contract
(N
);
830 -- Update Body_Id to point to the copied node for the remainder of
833 Body_Id
:= Defining_Entity
(N
);
837 -- The Body_Id is that of the copied node in the generic case, the
838 -- current node otherwise. Note that N was rewritten above, so we must
839 -- be sure to get the latest Body_Id value.
841 Set_Ekind
(Body_Id
, E_Package_Body
);
842 Set_Body_Entity
(Spec_Id
, Body_Id
);
843 Set_Spec_Entity
(Body_Id
, Spec_Id
);
845 -- Defining name for the package body is not a visible entity: Only the
846 -- defining name for the declaration is visible.
848 Set_Etype
(Body_Id
, Standard_Void_Type
);
849 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
850 Set_Corresponding_Spec
(N
, Spec_Id
);
851 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
853 -- The body entity is not used for semantics or code generation, but
854 -- it is attached to the entity list of the enclosing scope to simplify
855 -- the listing of back-annotations for the types it main contain.
857 if Scope
(Spec_Id
) /= Standard_Standard
then
858 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
861 -- Indicate that we are currently compiling the body of the package
863 Set_In_Package_Body
(Spec_Id
);
864 Set_Has_Completion
(Spec_Id
);
865 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
867 if Has_Aspects
(N
) then
868 Analyze_Aspect_Specifications
(N
, Body_Id
);
871 Push_Scope
(Spec_Id
);
873 -- Set SPARK_Mode only for non-generic package
875 if Ekind
(Spec_Id
) = E_Package
then
876 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
877 Set_SPARK_Aux_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
878 Set_SPARK_Pragma_Inherited
(Body_Id
);
879 Set_SPARK_Aux_Pragma_Inherited
(Body_Id
);
881 -- A package body may be instantiated or inlined at a later pass.
882 -- Restore the state of Ignore_SPARK_Mode_Pragmas_In_Instance when
883 -- it applied to the package spec.
885 if Ignore_SPARK_Mode_Pragmas
(Spec_Id
) then
886 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
890 Set_Categorization_From_Pragmas
(N
);
892 Install_Visible_Declarations
(Spec_Id
);
893 Install_Private_Declarations
(Spec_Id
);
894 Install_Private_With_Clauses
(Spec_Id
);
895 Install_Composite_Operations
(Spec_Id
);
897 Check_Anonymous_Access_Types
(Spec_Id
, N
);
899 if Ekind
(Spec_Id
) = E_Generic_Package
then
900 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
903 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
904 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
906 -- This is a nested package, so it may be necessary to declare certain
907 -- inherited subprograms that are not yet visible because the parent
908 -- type's subprograms are now visible.
910 if Ekind
(Scope
(Spec_Id
)) = E_Package
911 and then Scope
(Spec_Id
) /= Standard_Standard
913 Declare_Inherited_Private_Subprograms
(Spec_Id
);
916 if Present
(Declarations
(N
)) then
917 Analyze_Declarations
(Declarations
(N
));
918 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
921 -- Verify that the SPARK_Mode of the body agrees with that of its spec
923 if Present
(SPARK_Pragma
(Body_Id
)) then
924 if Present
(SPARK_Aux_Pragma
(Spec_Id
)) then
925 if Get_SPARK_Mode_From_Annotation
(SPARK_Aux_Pragma
(Spec_Id
)) =
928 Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Body_Id
)) = On
930 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
931 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
932 Error_Msg_Sloc
:= Sloc
(SPARK_Aux_Pragma
(Spec_Id
));
934 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
938 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
939 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
940 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
942 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
946 -- Analyze_Declarations has caused freezing of all types. Now generate
947 -- bodies for RACW primitives and stream attributes, if any.
949 if Ekind
(Spec_Id
) = E_Package
and then Has_RACW
(Spec_Id
) then
951 -- Attach subprogram bodies to support RACWs declared in spec
953 Append_RACW_Bodies
(Declarations
(N
), Spec_Id
);
954 Analyze_List
(Declarations
(N
));
957 HSS
:= Handled_Statement_Sequence
(N
);
959 if Present
(HSS
) then
960 Process_End_Label
(HSS
, 't', Spec_Id
);
963 -- Check that elaboration code in a preelaborable package body is
964 -- empty other than null statements and labels (RM 10.2.1(6)).
966 Validate_Null_Statement_Sequence
(N
);
969 Validate_Categorization_Dependency
(N
, Spec_Id
);
970 Check_Completion
(Body_Id
);
972 -- Generate start of body reference. Note that we do this fairly late,
973 -- because the call will use In_Extended_Main_Source_Unit as a check,
974 -- and we want to make sure that Corresponding_Stub links are set
976 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
978 -- For a generic package, collect global references and mark them on
979 -- the original body so that they are not resolved again at the point
982 if Ekind
(Spec_Id
) /= E_Package
then
983 Save_Global_References
(Original_Node
(N
));
987 -- The entities of the package body have so far been chained onto the
988 -- declaration chain for the spec. That's been fine while we were in the
989 -- body, since we wanted them to be visible, but now that we are leaving
990 -- the package body, they are no longer visible, so we remove them from
991 -- the entity chain of the package spec entity, and copy them to the
992 -- entity chain of the package body entity, where they will never again
995 if Present
(Last_Spec_Entity
) then
996 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
997 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
998 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
999 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
1002 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
1003 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
1004 Set_First_Entity
(Spec_Id
, Empty
);
1005 Set_Last_Entity
(Spec_Id
, Empty
);
1008 Update_Use_Clause_Chain
;
1009 End_Package_Scope
(Spec_Id
);
1011 -- All entities declared in body are not visible
1017 E
:= First_Entity
(Body_Id
);
1018 while Present
(E
) loop
1019 Set_Is_Immediately_Visible
(E
, False);
1020 Set_Is_Potentially_Use_Visible
(E
, False);
1023 -- Child units may appear on the entity list (e.g. if they appear
1024 -- in the context of a subunit) but they are not body entities.
1026 if not Is_Child_Unit
(E
) then
1027 Set_Is_Package_Body_Entity
(E
);
1034 Check_References
(Body_Id
);
1036 -- For a generic unit, check that the formal parameters are referenced,
1037 -- and that local variables are used, as for regular packages.
1039 if Ekind
(Spec_Id
) = E_Generic_Package
then
1040 Check_References
(Spec_Id
);
1043 -- At this point all entities of the package body are externally visible
1044 -- to the linker as their Is_Public flag is set to True. This proactive
1045 -- approach is necessary because an inlined or a generic body for which
1046 -- code is generated in other units may need to see these entities. Cut
1047 -- down the number of global symbols that do not neet public visibility
1048 -- as this has two beneficial effects:
1049 -- (1) It makes the compilation process more efficient.
1050 -- (2) It gives the code generator more leeway to optimize within each
1051 -- unit, especially subprograms.
1053 -- This is done only for top-level library packages or child units as
1054 -- the algorithm does a top-down traversal of the package body.
1056 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
1057 and then not Is_Generic_Unit
(Spec_Id
)
1059 Hide_Public_Entities
(Declarations
(N
));
1062 -- If expander is not active, then here is where we turn off the
1063 -- In_Package_Body flag, otherwise it is turned off at the end of the
1064 -- corresponding expansion routine. If this is an instance body, we need
1065 -- to qualify names of local entities, because the body may have been
1066 -- compiled as a preliminary to another instantiation.
1068 if not Expander_Active
then
1069 Set_In_Package_Body
(Spec_Id
, False);
1071 if Is_Generic_Instance
(Spec_Id
)
1072 and then Operating_Mode
= Generate_Code
1074 Qualify_Entity_Names
(N
);
1078 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
1079 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
1080 end Analyze_Package_Body_Helper
;
1082 ---------------------------------
1083 -- Analyze_Package_Declaration --
1084 ---------------------------------
1086 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
1087 Id
: constant Node_Id
:= Defining_Entity
(N
);
1089 Is_Comp_Unit
: constant Boolean :=
1090 Nkind
(Parent
(N
)) = N_Compilation_Unit
;
1092 Body_Required
: Boolean;
1093 -- True when this package declaration requires a corresponding body
1096 if Debug_Flag_C
then
1097 Write_Str
("==> package spec ");
1098 Write_Name
(Chars
(Id
));
1099 Write_Str
(" from ");
1100 Write_Location
(Sloc
(N
));
1105 Generate_Definition
(Id
);
1107 Set_Ekind
(Id
, E_Package
);
1108 Set_Etype
(Id
, Standard_Void_Type
);
1110 -- Set SPARK_Mode from context
1112 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
1113 Set_SPARK_Aux_Pragma
(Id
, SPARK_Mode_Pragma
);
1114 Set_SPARK_Pragma_Inherited
(Id
);
1115 Set_SPARK_Aux_Pragma_Inherited
(Id
);
1117 -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in case
1118 -- the body of this package is instantiated or inlined later and out of
1119 -- context. The body uses this attribute to restore the value of the
1122 if Ignore_SPARK_Mode_Pragmas_In_Instance
then
1123 Set_Ignore_SPARK_Mode_Pragmas
(Id
);
1126 -- Analyze aspect specifications immediately, since we need to recognize
1127 -- things like Pure early enough to diagnose violations during analysis.
1129 if Has_Aspects
(N
) then
1130 Analyze_Aspect_Specifications
(N
, Id
);
1133 -- Ada 2005 (AI-217): Check if the package has been illegally named in
1134 -- a limited-with clause of its own context. In this case the error has
1135 -- been previously notified by Analyze_Context.
1137 -- limited with Pkg; -- ERROR
1138 -- package Pkg is ...
1140 if From_Limited_With
(Id
) then
1146 Set_Is_Pure
(Id
, Is_Pure
(Enclosing_Lib_Unit_Entity
));
1147 Set_Categorization_From_Pragmas
(N
);
1149 Analyze
(Specification
(N
));
1150 Validate_Categorization_Dependency
(N
, Id
);
1152 -- Determine whether the package requires a body. Abstract states are
1153 -- intentionally ignored because they do require refinement which can
1154 -- only come in a body, but at the same time they do not force the need
1155 -- for a body on their own (SPARK RM 7.1.4(4) and 7.2.2(3)).
1157 Body_Required
:= Unit_Requires_Body
(Id
);
1159 if not Body_Required
then
1161 -- If the package spec does not require an explicit body, then there
1162 -- are not entities requiring completion in the language sense. Call
1163 -- Check_Completion now to ensure that nested package declarations
1164 -- that require an implicit body get one. (In the case where a body
1165 -- is required, Check_Completion is called at the end of the body's
1166 -- declarative part.)
1170 -- If the package spec does not require an explicit body, then all
1171 -- abstract states declared in nested packages cannot possibly get
1172 -- a proper refinement (SPARK RM 7.2.2(3)). This check is performed
1173 -- only when the compilation unit is the main unit to allow for
1174 -- modular SPARK analysis where packages do not necessarily have
1177 if Is_Comp_Unit
then
1178 Check_State_Refinements
1180 Is_Main_Unit
=> Parent
(N
) = Cunit
(Main_Unit
));
1184 -- Set Body_Required indication on the compilation unit node
1186 if Is_Comp_Unit
then
1187 Set_Body_Required
(Parent
(N
), Body_Required
);
1189 if Legacy_Elaboration_Checks
and not Body_Required
then
1190 Set_Suppress_Elaboration_Warnings
(Id
);
1194 End_Package_Scope
(Id
);
1196 -- For the declaration of a library unit that is a remote types package,
1197 -- check legality rules regarding availability of stream attributes for
1198 -- types that contain non-remote access values. This subprogram performs
1199 -- visibility tests that rely on the fact that we have exited the scope
1202 if Is_Comp_Unit
then
1203 Validate_RT_RAT_Component
(N
);
1206 if Debug_Flag_C
then
1208 Write_Str
("<== package spec ");
1209 Write_Name
(Chars
(Id
));
1210 Write_Str
(" from ");
1211 Write_Location
(Sloc
(N
));
1214 end Analyze_Package_Declaration
;
1216 -----------------------------------
1217 -- Analyze_Package_Specification --
1218 -----------------------------------
1220 -- Note that this code is shared for the analysis of generic package specs
1221 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
1223 procedure Analyze_Package_Specification
(N
: Node_Id
) is
1224 Id
: constant Entity_Id
:= Defining_Entity
(N
);
1225 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
1226 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
1227 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
1230 Public_Child
: Boolean;
1232 Private_With_Clauses_Installed
: Boolean := False;
1233 -- In Ada 2005, private with_clauses are visible in the private part
1234 -- of a nested package, even if it appears in the public part of the
1235 -- enclosing package. This requires a separate step to install these
1236 -- private_with_clauses, and remove them at the end of the nested
1239 procedure Check_One_Tagged_Type_Or_Extension_At_Most
;
1240 -- Issue an error in SPARK mode if a package specification contains
1241 -- more than one tagged type or type extension.
1243 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
1244 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
1245 -- Is_True_Constant) on all variables that are entities of Id, and on
1246 -- the chain whose first element is FE. A recursive call is made for all
1247 -- packages and generic packages.
1249 procedure Generate_Parent_References
;
1250 -- For a child unit, generate references to parent units, for
1251 -- GPS navigation purposes.
1253 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
1254 -- Child and Unit are entities of compilation units. True if Child
1255 -- is a public child of Parent as defined in 10.1.1
1257 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
1258 -- Reject completion of an incomplete or private type declarations
1259 -- having a known discriminant part by an unchecked union.
1261 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
1262 -- Given the package entity of a generic package instantiation or
1263 -- formal package whose corresponding generic is a child unit, installs
1264 -- the private declarations of each of the child unit's parents.
1265 -- This has to be done at the point of entering the instance package's
1266 -- private part rather than being done in Sem_Ch12.Install_Parent
1267 -- (which is where the parents' visible declarations are installed).
1269 ------------------------------------------------
1270 -- Check_One_Tagged_Type_Or_Extension_At_Most --
1271 ------------------------------------------------
1273 procedure Check_One_Tagged_Type_Or_Extension_At_Most
is
1276 procedure Check_Decls
(Decls
: List_Id
);
1277 -- Check that either Previous is Empty and Decls does not contain
1278 -- more than one tagged type or type extension, or Previous is
1279 -- already set and Decls contains no tagged type or type extension.
1285 procedure Check_Decls
(Decls
: List_Id
) is
1289 Decl
:= First
(Decls
);
1290 while Present
(Decl
) loop
1291 if Nkind
(Decl
) = N_Full_Type_Declaration
1292 and then Is_Tagged_Type
(Defining_Identifier
(Decl
))
1294 if No
(Previous
) then
1298 Error_Msg_Sloc
:= Sloc
(Previous
);
1299 Check_SPARK_05_Restriction
1300 ("at most one tagged type or type extension allowed",
1301 "\\ previous declaration#",
1310 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
1314 Check_Decls
(Vis_Decls
);
1316 if Present
(Priv_Decls
) then
1317 Check_Decls
(Priv_Decls
);
1319 end Check_One_Tagged_Type_Or_Extension_At_Most
;
1321 ---------------------
1322 -- Clear_Constants --
1323 ---------------------
1325 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
1329 -- Ignore package renamings, not interesting and they can cause self
1330 -- referential loops in the code below.
1332 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
1336 -- Note: in the loop below, the check for Next_Entity pointing back
1337 -- to the package entity may seem odd, but it is needed, because a
1338 -- package can contain a renaming declaration to itself, and such
1339 -- renamings are generated automatically within package instances.
1342 while Present
(E
) and then E
/= Id
loop
1343 if Is_Assignable
(E
) then
1344 Set_Never_Set_In_Source
(E
, False);
1345 Set_Is_True_Constant
(E
, False);
1346 Set_Current_Value
(E
, Empty
);
1347 Set_Is_Known_Null
(E
, False);
1348 Set_Last_Assignment
(E
, Empty
);
1350 if not Can_Never_Be_Null
(E
) then
1351 Set_Is_Known_Non_Null
(E
, False);
1354 elsif Is_Package_Or_Generic_Package
(E
) then
1355 Clear_Constants
(E
, First_Entity
(E
));
1356 Clear_Constants
(E
, First_Private_Entity
(E
));
1361 end Clear_Constants
;
1363 --------------------------------
1364 -- Generate_Parent_References --
1365 --------------------------------
1367 procedure Generate_Parent_References
is
1368 Decl
: constant Node_Id
:= Parent
(N
);
1371 if Id
= Cunit_Entity
(Main_Unit
)
1372 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
1374 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1376 elsif not Nkind_In
(Unit
(Cunit
(Main_Unit
)), N_Subprogram_Body
,
1379 -- If current unit is an ancestor of main unit, generate a
1380 -- reference to its own parent.
1384 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
1387 if Nkind
(Main_Spec
) = N_Package_Body
then
1388 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
1391 U
:= Parent_Spec
(Main_Spec
);
1392 while Present
(U
) loop
1393 if U
= Parent
(Decl
) then
1394 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1397 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
1401 U
:= Parent_Spec
(Unit
(U
));
1406 end Generate_Parent_References
;
1408 ---------------------
1409 -- Is_Public_Child --
1410 ---------------------
1412 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
1414 if not Is_Private_Descendant
(Child
) then
1417 if Child
= Unit
then
1418 return not Private_Present
(
1419 Parent
(Unit_Declaration_Node
(Child
)));
1421 return Is_Public_Child
(Scope
(Child
), Unit
);
1424 end Is_Public_Child
;
1426 ----------------------------------------
1427 -- Inspect_Unchecked_Union_Completion --
1428 ----------------------------------------
1430 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
1434 Decl
:= First
(Decls
);
1435 while Present
(Decl
) loop
1437 -- We are looking at an incomplete or private type declaration
1438 -- with a known_discriminant_part whose full view is an
1439 -- Unchecked_Union. The seemingly useless check with Is_Type
1440 -- prevents cascaded errors when routines defined only for type
1441 -- entities are called with non-type entities.
1443 if Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
1444 N_Private_Type_Declaration
)
1445 and then Is_Type
(Defining_Identifier
(Decl
))
1446 and then Has_Discriminants
(Defining_Identifier
(Decl
))
1447 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
1449 Is_Unchecked_Union
(Full_View
(Defining_Identifier
(Decl
)))
1452 ("completion of discriminated partial view "
1453 & "cannot be an unchecked union",
1454 Full_View
(Defining_Identifier
(Decl
)));
1459 end Inspect_Unchecked_Union_Completion
;
1461 -----------------------------------------
1462 -- Install_Parent_Private_Declarations --
1463 -----------------------------------------
1465 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
1466 Inst_Par
: Entity_Id
;
1467 Gen_Par
: Entity_Id
;
1468 Inst_Node
: Node_Id
;
1471 Inst_Par
:= Inst_Id
;
1474 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
1475 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
1476 Inst_Node
:= Get_Unit_Instantiation_Node
(Inst_Par
);
1478 if Nkind_In
(Inst_Node
, N_Package_Instantiation
,
1479 N_Formal_Package_Declaration
)
1480 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
1482 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
1484 if Present
(Renamed_Entity
(Inst_Par
)) then
1485 Inst_Par
:= Renamed_Entity
(Inst_Par
);
1490 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
1492 -- Install the private declarations and private use clauses
1493 -- of a parent instance of the child instance, unless the
1494 -- parent instance private declarations have already been
1495 -- installed earlier in Analyze_Package_Specification, which
1496 -- happens when a generic child is instantiated, and the
1497 -- instance is a child of the parent instance.
1499 -- Installing the use clauses of the parent instance twice
1500 -- is both unnecessary and wrong, because it would cause the
1501 -- clauses to be chained to themselves in the use clauses
1502 -- list of the scope stack entry. That in turn would cause
1503 -- an endless loop from End_Use_Clauses upon scope exit.
1505 -- The parent is now fully visible. It may be a hidden open
1506 -- scope if we are currently compiling some child instance
1507 -- declared within it, but while the current instance is being
1508 -- compiled the parent is immediately visible. In particular
1509 -- its entities must remain visible if a stack save/restore
1510 -- takes place through a call to Rtsfind.
1512 if Present
(Gen_Par
) then
1513 if not In_Private_Part
(Inst_Par
) then
1514 Install_Private_Declarations
(Inst_Par
);
1515 Set_Use
(Private_Declarations
1517 (Unit_Declaration_Node
(Inst_Par
))));
1518 Set_Is_Hidden_Open_Scope
(Inst_Par
, False);
1521 -- If we've reached the end of the generic instance parents,
1522 -- then finish off by looping through the nongeneric parents
1523 -- and installing their private declarations.
1525 -- If one of the non-generic parents is itself on the scope
1526 -- stack, do not install its private declarations: they are
1527 -- installed in due time when the private part of that parent
1531 while Present
(Inst_Par
)
1532 and then Inst_Par
/= Standard_Standard
1533 and then (not In_Open_Scopes
(Inst_Par
)
1534 or else not In_Private_Part
(Inst_Par
))
1536 if Nkind
(Inst_Node
) = N_Formal_Package_Declaration
1538 not Is_Ancestor_Package
1539 (Inst_Par
, Cunit_Entity
(Current_Sem_Unit
))
1541 Install_Private_Declarations
(Inst_Par
);
1543 (Private_Declarations
1545 (Unit_Declaration_Node
(Inst_Par
))));
1546 Inst_Par
:= Scope
(Inst_Par
);
1559 end Install_Parent_Private_Declarations
;
1561 -- Start of processing for Analyze_Package_Specification
1564 if Present
(Vis_Decls
) then
1565 Analyze_Declarations
(Vis_Decls
);
1568 -- Inspect the entities defined in the package and ensure that all
1569 -- incomplete types have received full declarations. Build default
1570 -- initial condition and invariant procedures for all qualifying types.
1572 E
:= First_Entity
(Id
);
1573 while Present
(E
) loop
1575 -- Check on incomplete types
1577 -- AI05-0213: A formal incomplete type has no completion, and neither
1578 -- does the corresponding subtype in an instance.
1580 if Is_Incomplete_Type
(E
)
1581 and then No
(Full_View
(E
))
1582 and then not Is_Generic_Type
(E
)
1583 and then not From_Limited_With
(E
)
1584 and then not Is_Generic_Actual_Type
(E
)
1586 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
1592 if Is_Remote_Call_Interface
(Id
)
1593 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
1595 Validate_RCI_Declarations
(Id
);
1598 -- Save global references in the visible declarations, before installing
1599 -- private declarations of parent unit if there is one, because the
1600 -- privacy status of types defined in the parent will change. This is
1601 -- only relevant for generic child units, but is done in all cases for
1604 if Ekind
(Id
) = E_Generic_Package
1605 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1608 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1609 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1612 -- Insert the freezing nodes after the visible declarations to
1613 -- ensure that we analyze its aspects; needed to ensure that
1614 -- global entities referenced in the aspects are properly handled.
1616 if Ada_Version
>= Ada_2012
1617 and then Is_Non_Empty_List
(Vis_Decls
)
1618 and then Is_Empty_List
(Priv_Decls
)
1620 Insert_List_After_And_Analyze
1621 (Last
(Vis_Decls
), Freeze_Entity
(Id
, Last
(Vis_Decls
)));
1624 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1625 Save_Global_References
(Orig_Decl
);
1626 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1630 -- If package is a public child unit, then make the private declarations
1631 -- of the parent visible.
1633 Public_Child
:= False;
1637 Pack_Decl
: Node_Id
;
1642 Par_Spec
:= Parent_Spec
(Parent
(N
));
1644 -- If the package is formal package of an enclosing generic, it is
1645 -- transformed into a local generic declaration, and compiled to make
1646 -- its spec available. We need to retrieve the original generic to
1647 -- determine whether it is a child unit, and install its parents.
1651 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1653 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1654 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1657 if Present
(Par_Spec
) then
1658 Generate_Parent_References
;
1660 while Scope
(Par
) /= Standard_Standard
1661 and then Is_Public_Child
(Id
, Par
)
1662 and then In_Open_Scopes
(Par
)
1664 Public_Child
:= True;
1666 Install_Private_Declarations
(Par
);
1667 Install_Private_With_Clauses
(Par
);
1668 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1669 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1674 if Is_Compilation_Unit
(Id
) then
1675 Install_Private_With_Clauses
(Id
);
1677 -- The current compilation unit may include private with_clauses,
1678 -- which are visible in the private part of the current nested
1679 -- package, and have to be installed now. This is not done for
1680 -- nested instantiations, where the private with_clauses of the
1681 -- enclosing unit have no effect once the instantiation info is
1682 -- established and we start analyzing the package declaration.
1685 Comp_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
1687 if Is_Package_Or_Generic_Package
(Comp_Unit
)
1688 and then not In_Private_Part
(Comp_Unit
)
1689 and then not In_Instance
1691 Install_Private_With_Clauses
(Comp_Unit
);
1692 Private_With_Clauses_Installed
:= True;
1697 -- If this is a package associated with a generic instance or formal
1698 -- package, then the private declarations of each of the generic's
1699 -- parents must be installed at this point.
1701 if Is_Generic_Instance
(Id
) then
1702 Install_Parent_Private_Declarations
(Id
);
1705 -- Analyze private part if present. The flag In_Private_Part is reset
1706 -- in End_Package_Scope.
1708 L
:= Last_Entity
(Id
);
1710 if Present
(Priv_Decls
) then
1711 Set_In_Private_Part
(Id
);
1713 -- Upon entering a public child's private part, it may be necessary
1714 -- to declare subprograms that were derived in the package's visible
1715 -- part but not yet made visible.
1717 if Public_Child
then
1718 Declare_Inherited_Private_Subprograms
(Id
);
1721 Analyze_Declarations
(Priv_Decls
);
1723 -- Check the private declarations for incomplete deferred constants
1725 Inspect_Deferred_Constant_Completion
(Priv_Decls
);
1727 -- The first private entity is the immediate follower of the last
1728 -- visible entity, if there was one.
1731 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1733 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
1736 -- There may be inherited private subprograms that need to be declared,
1737 -- even in the absence of an explicit private part. If there are any
1738 -- public declarations in the package and the package is a public child
1739 -- unit, then an implicit private part is assumed.
1741 elsif Present
(L
) and then Public_Child
then
1742 Set_In_Private_Part
(Id
);
1743 Declare_Inherited_Private_Subprograms
(Id
);
1744 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1747 E
:= First_Entity
(Id
);
1748 while Present
(E
) loop
1750 -- Check rule of 3.6(11), which in general requires waiting till all
1751 -- full types have been seen.
1753 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1754 Check_Aliased_Component_Types
(E
);
1757 -- Check preelaborable initialization for full type completing a
1758 -- private type for which pragma Preelaborable_Initialization given.
1761 and then Must_Have_Preelab_Init
(E
)
1762 and then not Has_Preelaborable_Initialization
(E
)
1765 ("full view of & does not have preelaborable initialization", E
);
1771 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1772 -- declaration having a known_discriminant_part shall not be an
1773 -- unchecked union type.
1775 if Present
(Vis_Decls
) then
1776 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1779 if Present
(Priv_Decls
) then
1780 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1783 if Ekind
(Id
) = E_Generic_Package
1784 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1785 and then Present
(Priv_Decls
)
1787 -- Save global references in private declarations, ignoring the
1788 -- visible declarations that were processed earlier.
1791 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1792 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1793 Save_Form
: constant List_Id
:=
1794 Generic_Formal_Declarations
(Orig_Decl
);
1797 -- Insert the freezing nodes after the private declarations to
1798 -- ensure that we analyze its aspects; needed to ensure that
1799 -- global entities referenced in the aspects are properly handled.
1801 if Ada_Version
>= Ada_2012
1802 and then Is_Non_Empty_List
(Priv_Decls
)
1804 Insert_List_After_And_Analyze
1805 (Last
(Priv_Decls
), Freeze_Entity
(Id
, Last
(Priv_Decls
)));
1808 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1809 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1810 Save_Global_References
(Orig_Decl
);
1811 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1812 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1816 Process_End_Label
(N
, 'e', Id
);
1818 -- Remove private_with_clauses of enclosing compilation unit, if they
1821 if Private_With_Clauses_Installed
then
1822 Remove_Private_With_Clauses
(Cunit
(Current_Sem_Unit
));
1825 -- For the case of a library level package, we must go through all the
1826 -- entities clearing the indications that the value may be constant and
1827 -- not modified. Why? Because any client of this package may modify
1828 -- these values freely from anywhere. This also applies to any nested
1829 -- packages or generic packages.
1831 -- For now we unconditionally clear constants for packages that are
1832 -- instances of generic packages. The reason is that we do not have the
1833 -- body yet, and we otherwise think things are unreferenced when they
1834 -- are not. This should be fixed sometime (the effect is not terrible,
1835 -- we just lose some warnings, and also some cases of value propagation)
1838 if Is_Library_Level_Entity
(Id
)
1839 or else Is_Generic_Instance
(Id
)
1841 Clear_Constants
(Id
, First_Entity
(Id
));
1842 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1845 -- Issue an error in SPARK mode if a package specification contains
1846 -- more than one tagged type or type extension.
1848 Check_One_Tagged_Type_Or_Extension_At_Most
;
1850 -- Output relevant information as to why the package requires a body.
1851 -- Do not consider generated packages as this exposes internal symbols
1852 -- and leads to confusing messages.
1854 if List_Body_Required_Info
1855 and then In_Extended_Main_Source_Unit
(Id
)
1856 and then Unit_Requires_Body
(Id
)
1857 and then Comes_From_Source
(Id
)
1859 Unit_Requires_Body_Info
(Id
);
1862 -- Nested package specs that do not require bodies are not checked for
1863 -- ineffective use clauses due to the possbility of subunits. This is
1864 -- because at this stage it is impossible to tell whether there will be
1867 if not Unit_Requires_Body
(Id
)
1868 and then Is_Compilation_Unit
(Id
)
1869 and then not Is_Private_Descendant
(Id
)
1871 Update_Use_Clause_Chain
;
1873 end Analyze_Package_Specification
;
1875 --------------------------------------
1876 -- Analyze_Private_Type_Declaration --
1877 --------------------------------------
1879 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1880 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1881 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1884 Generate_Definition
(Id
);
1885 Set_Is_Pure
(Id
, PF
);
1886 Init_Size_Align
(Id
);
1888 if not Is_Package_Or_Generic_Package
(Current_Scope
)
1889 or else In_Private_Part
(Current_Scope
)
1891 Error_Msg_N
("invalid context for private declaration", N
);
1894 New_Private_Type
(N
, Id
, N
);
1895 Set_Depends_On_Private
(Id
);
1897 -- Set the SPARK mode from the current context
1899 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
1900 Set_SPARK_Pragma_Inherited
(Id
);
1902 if Has_Aspects
(N
) then
1903 Analyze_Aspect_Specifications
(N
, Id
);
1905 end Analyze_Private_Type_Declaration
;
1907 ----------------------------------
1908 -- Check_Anonymous_Access_Types --
1909 ----------------------------------
1911 procedure Check_Anonymous_Access_Types
1912 (Spec_Id
: Entity_Id
;
1919 -- Itype references are only needed by gigi, to force elaboration of
1920 -- itypes. In the absence of code generation, they are not needed.
1922 if not Expander_Active
then
1926 E
:= First_Entity
(Spec_Id
);
1927 while Present
(E
) loop
1928 if Ekind
(E
) = E_Anonymous_Access_Type
1929 and then From_Limited_With
(E
)
1931 IR
:= Make_Itype_Reference
(Sloc
(P_Body
));
1934 if No
(Declarations
(P_Body
)) then
1935 Set_Declarations
(P_Body
, New_List
(IR
));
1937 Prepend
(IR
, Declarations
(P_Body
));
1943 end Check_Anonymous_Access_Types
;
1945 -------------------------------------------
1946 -- Declare_Inherited_Private_Subprograms --
1947 -------------------------------------------
1949 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1951 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1952 -- Check whether an inherited subprogram S is an operation of an
1953 -- untagged derived type T.
1955 ---------------------
1956 -- Is_Primitive_Of --
1957 ---------------------
1959 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1963 -- If the full view is a scalar type, the type is the anonymous base
1964 -- type, but the operation mentions the first subtype, so check the
1965 -- signature against the base type.
1967 if Base_Type
(Etype
(S
)) = Base_Type
(T
) then
1971 Formal
:= First_Formal
(S
);
1972 while Present
(Formal
) loop
1973 if Base_Type
(Etype
(Formal
)) = Base_Type
(T
) then
1977 Next_Formal
(Formal
);
1982 end Is_Primitive_Of
;
1989 Op_Elmt_2
: Elmt_Id
;
1990 Prim_Op
: Entity_Id
;
1991 New_Op
: Entity_Id
:= Empty
;
1992 Parent_Subp
: Entity_Id
;
1995 -- Start of processing for Declare_Inherited_Private_Subprograms
1998 E
:= First_Entity
(Id
);
1999 while Present
(E
) loop
2001 -- If the entity is a nonprivate type extension whose parent type
2002 -- is declared in an open scope, then the type may have inherited
2003 -- operations that now need to be made visible. Ditto if the entity
2004 -- is a formal derived type in a child unit.
2006 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
2008 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
2009 and then Is_Generic_Type
(E
)))
2010 and then In_Open_Scopes
(Scope
(Etype
(E
)))
2011 and then Is_Base_Type
(E
)
2013 if Is_Tagged_Type
(E
) then
2014 Op_List
:= Primitive_Operations
(E
);
2016 Tag
:= First_Tag_Component
(E
);
2018 Op_Elmt
:= First_Elmt
(Op_List
);
2019 while Present
(Op_Elmt
) loop
2020 Prim_Op
:= Node
(Op_Elmt
);
2022 -- Search primitives that are implicit operations with an
2023 -- internal name whose parent operation has a normal name.
2025 if Present
(Alias
(Prim_Op
))
2026 and then Find_Dispatching_Type
(Alias
(Prim_Op
)) /= E
2027 and then not Comes_From_Source
(Prim_Op
)
2028 and then Is_Internal_Name
(Chars
(Prim_Op
))
2029 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
2031 Parent_Subp
:= Alias
(Prim_Op
);
2033 -- Case 1: Check if the type has also an explicit
2034 -- overriding for this primitive.
2036 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
2037 while Present
(Op_Elmt_2
) loop
2039 -- Skip entities with attribute Interface_Alias since
2040 -- they are not overriding primitives (these entities
2041 -- link an interface primitive with their covering
2044 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
2045 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
2046 and then No
(Interface_Alias
(Node
(Op_Elmt_2
)))
2048 -- The private inherited operation has been
2049 -- overridden by an explicit subprogram:
2050 -- replace the former by the latter.
2052 New_Op
:= Node
(Op_Elmt_2
);
2053 Replace_Elmt
(Op_Elmt
, New_Op
);
2054 Remove_Elmt
(Op_List
, Op_Elmt_2
);
2055 Set_Overridden_Operation
(New_Op
, Parent_Subp
);
2057 -- We don't need to inherit its dispatching slot.
2058 -- Set_All_DT_Position has previously ensured that
2059 -- the same slot was assigned to the two primitives
2062 and then Present
(DTC_Entity
(New_Op
))
2063 and then Present
(DTC_Entity
(Prim_Op
))
2066 (DT_Position
(New_Op
) = DT_Position
(Prim_Op
));
2070 goto Next_Primitive
;
2073 Next_Elmt
(Op_Elmt_2
);
2076 -- Case 2: We have not found any explicit overriding and
2077 -- hence we need to declare the operation (i.e., make it
2080 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
2082 -- Inherit the dispatching slot if E is already frozen
2085 and then Present
(DTC_Entity
(Alias
(Prim_Op
)))
2087 Set_DTC_Entity_Value
(E
, New_Op
);
2088 Set_DT_Position_Value
(New_Op
,
2089 DT_Position
(Alias
(Prim_Op
)));
2093 (Is_Dispatching_Operation
(New_Op
)
2094 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
2096 -- Substitute the new operation for the old one in the
2097 -- type's primitive operations list. Since the new
2098 -- operation was also just added to the end of list,
2099 -- the last element must be removed.
2101 -- (Question: is there a simpler way of declaring the
2102 -- operation, say by just replacing the name of the
2103 -- earlier operation, reentering it in the in the symbol
2104 -- table (how?), and marking it as private???)
2106 Replace_Elmt
(Op_Elmt
, New_Op
);
2107 Remove_Last_Elmt
(Op_List
);
2111 Next_Elmt
(Op_Elmt
);
2114 -- Generate listing showing the contents of the dispatch table
2116 if Debug_Flag_ZZ
then
2121 -- For untagged type, scan forward to locate inherited hidden
2124 Prim_Op
:= Next_Entity
(E
);
2125 while Present
(Prim_Op
) loop
2126 if Is_Subprogram
(Prim_Op
)
2127 and then Present
(Alias
(Prim_Op
))
2128 and then not Comes_From_Source
(Prim_Op
)
2129 and then Is_Internal_Name
(Chars
(Prim_Op
))
2130 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
2131 and then Is_Primitive_Of
(E
, Prim_Op
)
2133 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
2136 Next_Entity
(Prim_Op
);
2138 -- Derived operations appear immediately after the type
2139 -- declaration (or the following subtype indication for
2140 -- a derived scalar type). Further declarations cannot
2141 -- include inherited operations of the type.
2143 if Present
(Prim_Op
) then
2144 exit when Ekind
(Prim_Op
) not in Overloadable_Kind
;
2152 end Declare_Inherited_Private_Subprograms
;
2154 -----------------------
2155 -- End_Package_Scope --
2156 -----------------------
2158 procedure End_Package_Scope
(P
: Entity_Id
) is
2160 Uninstall_Declarations
(P
);
2162 end End_Package_Scope
;
2164 ---------------------------
2165 -- Exchange_Declarations --
2166 ---------------------------
2168 procedure Exchange_Declarations
(Id
: Entity_Id
) is
2169 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
2170 H1
: constant Entity_Id
:= Homonym
(Id
);
2171 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
2176 -- If missing full declaration for type, nothing to exchange
2178 if No
(Full_Id
) then
2182 -- Otherwise complete the exchange, and preserve semantic links
2184 Next2
:= Next_Entity
(Full_Id
);
2185 H2
:= Homonym
(Full_Id
);
2187 -- Reset full declaration pointer to reflect the switched entities and
2188 -- readjust the next entity chains.
2190 Exchange_Entities
(Id
, Full_Id
);
2192 Link_Entities
(Id
, Next1
);
2193 Set_Homonym
(Id
, H1
);
2195 Set_Full_View
(Full_Id
, Id
);
2196 Link_Entities
(Full_Id
, Next2
);
2197 Set_Homonym
(Full_Id
, H2
);
2198 end Exchange_Declarations
;
2200 ----------------------------
2201 -- Install_Package_Entity --
2202 ----------------------------
2204 procedure Install_Package_Entity
(Id
: Entity_Id
) is
2206 if not Is_Internal
(Id
) then
2207 if Debug_Flag_E
then
2208 Write_Str
("Install: ");
2209 Write_Name
(Chars
(Id
));
2213 if Is_Child_Unit
(Id
) then
2216 -- Do not enter implicitly inherited non-overridden subprograms of
2217 -- a tagged type back into visibility if they have non-conformant
2218 -- homographs (Ada RM 8.3 12.3/2).
2220 elsif Is_Hidden_Non_Overridden_Subpgm
(Id
) then
2224 Set_Is_Immediately_Visible
(Id
);
2227 end Install_Package_Entity
;
2229 ----------------------------------
2230 -- Install_Private_Declarations --
2231 ----------------------------------
2233 procedure Install_Private_Declarations
(P
: Entity_Id
) is
2236 Priv_Deps
: Elist_Id
;
2238 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
);
2239 -- When the full view of a private type is made available, we do the
2240 -- same for its private dependents under proper visibility conditions.
2241 -- When compiling a grand-chid unit this needs to be done recursively.
2243 -----------------------------
2244 -- Swap_Private_Dependents --
2245 -----------------------------
2247 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
) is
2250 Priv_Elmt
: Elmt_Id
;
2254 Priv_Elmt
:= First_Elmt
(Priv_Deps
);
2255 while Present
(Priv_Elmt
) loop
2256 Priv
:= Node
(Priv_Elmt
);
2258 -- Before the exchange, verify that the presence of the Full_View
2259 -- field. This field will be empty if the entity has already been
2260 -- installed due to a previous call.
2262 if Present
(Full_View
(Priv
)) and then Is_Visible_Dependent
(Priv
)
2264 if Is_Private_Type
(Priv
) then
2265 Deps
:= Private_Dependents
(Priv
);
2271 -- For each subtype that is swapped, we also swap the reference
2272 -- to it in Private_Dependents, to allow access to it when we
2273 -- swap them out in End_Package_Scope.
2275 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
2277 -- Ensure that both views of the dependent private subtype are
2278 -- immediately visible if within some open scope. Check full
2279 -- view before exchanging views.
2281 if In_Open_Scopes
(Scope
(Full_View
(Priv
))) then
2282 Set_Is_Immediately_Visible
(Priv
);
2285 Exchange_Declarations
(Priv
);
2286 Set_Is_Immediately_Visible
2287 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
2289 Set_Is_Potentially_Use_Visible
2290 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
2292 -- Within a child unit, recurse, except in generic child unit,
2293 -- which (unfortunately) handle private_dependents separately.
2296 and then Is_Child_Unit
(Cunit_Entity
(Current_Sem_Unit
))
2297 and then not Is_Empty_Elmt_List
(Deps
)
2298 and then not Inside_A_Generic
2300 Swap_Private_Dependents
(Deps
);
2304 Next_Elmt
(Priv_Elmt
);
2306 end Swap_Private_Dependents
;
2308 -- Start of processing for Install_Private_Declarations
2311 -- First exchange declarations for private types, so that the full
2312 -- declaration is visible. For each private type, we check its
2313 -- Private_Dependents list and also exchange any subtypes of or derived
2314 -- types from it. Finally, if this is a Taft amendment type, the
2315 -- incomplete declaration is irrelevant, and we want to link the
2316 -- eventual full declaration with the original private one so we
2317 -- also skip the exchange.
2319 Id
:= First_Entity
(P
);
2320 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2321 if Is_Private_Base_Type
(Id
)
2322 and then Present
(Full_View
(Id
))
2323 and then Comes_From_Source
(Full_View
(Id
))
2324 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
2325 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
2327 -- If there is a use-type clause on the private type, set the full
2328 -- view accordingly.
2330 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
2331 Full
:= Full_View
(Id
);
2333 if Is_Private_Base_Type
(Full
)
2334 and then Has_Private_Declaration
(Full
)
2335 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
2336 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
2337 and then In_Package_Body
(Current_Scope
)
2338 and then not Is_Private_Type
(Etype
(Full
))
2340 -- This is the completion of a private type by a derivation
2341 -- from another private type which is not private anymore. This
2342 -- can only happen in a package nested within a child package,
2343 -- when the parent type is defined in the parent unit. At this
2344 -- point the current type is not private either, and we have
2345 -- to install the underlying full view, which is now visible.
2346 -- Save the current full view as well, so that all views can be
2347 -- restored on exit. It may seem that after compiling the child
2348 -- body there are not environments to restore, but the back-end
2349 -- expects those links to be valid, and freeze nodes depend on
2352 if No
(Full_View
(Full
))
2353 and then Present
(Underlying_Full_View
(Full
))
2355 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
2356 Set_Underlying_Full_View
(Id
, Full
);
2357 Set_Is_Underlying_Full_View
(Full
);
2359 Set_Underlying_Full_View
(Full
, Empty
);
2360 Set_Is_Frozen
(Full_View
(Id
));
2364 Priv_Deps
:= Private_Dependents
(Id
);
2365 Exchange_Declarations
(Id
);
2366 Set_Is_Immediately_Visible
(Id
);
2367 Swap_Private_Dependents
(Priv_Deps
);
2373 -- Next make other declarations in the private part visible as well
2375 Id
:= First_Private_Entity
(P
);
2376 while Present
(Id
) loop
2377 Install_Package_Entity
(Id
);
2378 Set_Is_Hidden
(Id
, False);
2382 -- An abstract state is partially refined when it has at least one
2383 -- Part_Of constituent. Since these constituents are being installed
2384 -- into visibility, update the partial refinement status of any state
2385 -- defined in the associated package, subject to at least one Part_Of
2388 if Ekind_In
(P
, E_Generic_Package
, E_Package
) then
2390 States
: constant Elist_Id
:= Abstract_States
(P
);
2391 State_Elmt
: Elmt_Id
;
2392 State_Id
: Entity_Id
;
2395 if Present
(States
) then
2396 State_Elmt
:= First_Elmt
(States
);
2397 while Present
(State_Elmt
) loop
2398 State_Id
:= Node
(State_Elmt
);
2400 if Present
(Part_Of_Constituents
(State_Id
)) then
2401 Set_Has_Partial_Visible_Refinement
(State_Id
);
2404 Next_Elmt
(State_Elmt
);
2410 -- Indicate that the private part is currently visible, so it can be
2411 -- properly reset on exit.
2413 Set_In_Private_Part
(P
);
2414 end Install_Private_Declarations
;
2416 ----------------------------------
2417 -- Install_Visible_Declarations --
2418 ----------------------------------
2420 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
2422 Last_Entity
: Entity_Id
;
2426 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
2428 if Is_Package_Or_Generic_Package
(P
) then
2429 Last_Entity
:= First_Private_Entity
(P
);
2431 Last_Entity
:= Empty
;
2434 Id
:= First_Entity
(P
);
2435 while Present
(Id
) and then Id
/= Last_Entity
loop
2436 Install_Package_Entity
(Id
);
2439 end Install_Visible_Declarations
;
2441 --------------------------
2442 -- Is_Private_Base_Type --
2443 --------------------------
2445 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
2447 return Ekind
(E
) = E_Private_Type
2448 or else Ekind
(E
) = E_Limited_Private_Type
2449 or else Ekind
(E
) = E_Record_Type_With_Private
;
2450 end Is_Private_Base_Type
;
2452 --------------------------
2453 -- Is_Visible_Dependent --
2454 --------------------------
2456 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
2458 S
: constant Entity_Id
:= Scope
(Dep
);
2461 -- Renamings created for actual types have the visibility of the actual
2463 if Ekind
(S
) = E_Package
2464 and then Is_Generic_Instance
(S
)
2465 and then (Is_Generic_Actual_Type
(Dep
)
2466 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
2470 elsif not (Is_Derived_Type
(Dep
))
2471 and then Is_Derived_Type
(Full_View
(Dep
))
2473 -- When instantiating a package body, the scope stack is empty, so
2474 -- check instead whether the dependent type is defined in the same
2475 -- scope as the instance itself.
2477 return In_Open_Scopes
(S
)
2478 or else (Is_Generic_Instance
(Current_Scope
)
2479 and then Scope
(Dep
) = Scope
(Current_Scope
));
2483 end Is_Visible_Dependent
;
2485 ----------------------------
2486 -- May_Need_Implicit_Body --
2487 ----------------------------
2489 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
2490 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
2491 S
: constant Node_Id
:= Parent
(P
);
2496 if not Has_Completion
(E
)
2497 and then Nkind
(P
) = N_Package_Declaration
2498 and then (Present
(Activation_Chain_Entity
(P
)) or else Has_RACW
(E
))
2501 Make_Package_Body
(Sloc
(E
),
2502 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
2503 Chars
=> Chars
(E
)),
2504 Declarations
=> New_List
);
2506 if Nkind
(S
) = N_Package_Specification
then
2507 if Present
(Private_Declarations
(S
)) then
2508 Decls
:= Private_Declarations
(S
);
2510 Decls
:= Visible_Declarations
(S
);
2513 Decls
:= Declarations
(S
);
2519 end May_Need_Implicit_Body
;
2521 ----------------------
2522 -- New_Private_Type --
2523 ----------------------
2525 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
2527 -- For other than Ada 2012, enter the name in the current scope
2529 if Ada_Version
< Ada_2012
then
2532 -- Ada 2012 (AI05-0162): Enter the name in the current scope. Note that
2533 -- there may be an incomplete previous view.
2539 Prev
:= Find_Type_Name
(N
);
2540 pragma Assert
(Prev
= Id
2541 or else (Ekind
(Prev
) = E_Incomplete_Type
2542 and then Present
(Full_View
(Prev
))
2543 and then Full_View
(Prev
) = Id
));
2547 if Limited_Present
(Def
) then
2548 Set_Ekind
(Id
, E_Limited_Private_Type
);
2550 Set_Ekind
(Id
, E_Private_Type
);
2554 Set_Has_Delayed_Freeze
(Id
);
2555 Set_Is_First_Subtype
(Id
);
2556 Init_Size_Align
(Id
);
2558 Set_Is_Constrained
(Id
,
2559 No
(Discriminant_Specifications
(N
))
2560 and then not Unknown_Discriminants_Present
(N
));
2562 -- Set tagged flag before processing discriminants, to catch illegal
2565 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
2567 Set_Discriminant_Constraint
(Id
, No_Elist
);
2568 Set_Stored_Constraint
(Id
, No_Elist
);
2570 if Present
(Discriminant_Specifications
(N
)) then
2572 Process_Discriminants
(N
);
2575 elsif Unknown_Discriminants_Present
(N
) then
2576 Set_Has_Unknown_Discriminants
(Id
);
2579 Set_Private_Dependents
(Id
, New_Elmt_List
);
2581 if Tagged_Present
(Def
) then
2582 Set_Ekind
(Id
, E_Record_Type_With_Private
);
2583 Set_Direct_Primitive_Operations
(Id
, New_Elmt_List
);
2584 Set_Is_Abstract_Type
(Id
, Abstract_Present
(Def
));
2585 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
2586 Set_Has_Delayed_Freeze
(Id
, True);
2588 -- Recognize Ada.Real_Time.Timing_Events.Timing_Events here
2590 if Is_RTE
(Id
, RE_Timing_Event
) then
2591 Set_Has_Timing_Event
(Id
);
2594 -- Create a class-wide type with the same attributes
2596 Make_Class_Wide_Type
(Id
);
2598 elsif Abstract_Present
(Def
) then
2599 Error_Msg_N
("only a tagged type can be abstract", N
);
2601 end New_Private_Type
;
2603 ---------------------------------
2604 -- Requires_Completion_In_Body --
2605 ---------------------------------
2607 function Requires_Completion_In_Body
2609 Pack_Id
: Entity_Id
;
2610 Do_Abstract_States
: Boolean := False) return Boolean
2613 -- Always ignore child units. Child units get added to the entity list
2614 -- of a parent unit, but are not original entities of the parent, and
2615 -- so do not affect whether the parent needs a body.
2617 if Is_Child_Unit
(Id
) then
2620 -- Ignore formal packages and their renamings
2622 elsif Ekind
(Id
) = E_Package
2623 and then Nkind
(Original_Node
(Unit_Declaration_Node
(Id
))) =
2624 N_Formal_Package_Declaration
2628 -- Otherwise test to see if entity requires a completion. Note that
2629 -- subprogram entities whose declaration does not come from source are
2630 -- ignored here on the basis that we assume the expander will provide an
2631 -- implicit completion at some point.
2633 elsif (Is_Overloadable
(Id
)
2634 and then not Ekind_In
(Id
, E_Enumeration_Literal
, E_Operator
)
2635 and then not Is_Abstract_Subprogram
(Id
)
2636 and then not Has_Completion
(Id
)
2637 and then Comes_From_Source
(Parent
(Id
)))
2640 (Ekind
(Id
) = E_Package
2641 and then Id
/= Pack_Id
2642 and then not Has_Completion
(Id
)
2643 and then Unit_Requires_Body
(Id
, Do_Abstract_States
))
2646 (Ekind
(Id
) = E_Incomplete_Type
2647 and then No
(Full_View
(Id
))
2648 and then not Is_Generic_Type
(Id
))
2651 (Ekind_In
(Id
, E_Task_Type
, E_Protected_Type
)
2652 and then not Has_Completion
(Id
))
2655 (Ekind
(Id
) = E_Generic_Package
2656 and then Id
/= Pack_Id
2657 and then not Has_Completion
(Id
)
2658 and then Unit_Requires_Body
(Id
, Do_Abstract_States
))
2661 (Is_Generic_Subprogram
(Id
)
2662 and then not Has_Completion
(Id
))
2666 -- Otherwise the entity does not require completion in a package body
2671 end Requires_Completion_In_Body
;
2673 ----------------------------
2674 -- Uninstall_Declarations --
2675 ----------------------------
2677 procedure Uninstall_Declarations
(P
: Entity_Id
) is
2678 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
2681 Priv_Elmt
: Elmt_Id
;
2682 Priv_Sub
: Entity_Id
;
2684 procedure Preserve_Full_Attributes
(Priv
: Entity_Id
; Full
: Entity_Id
);
2685 -- Copy to the private declaration the attributes of the full view that
2686 -- need to be available for the partial view also.
2688 function Type_In_Use
(T
: Entity_Id
) return Boolean;
2689 -- Check whether type or base type appear in an active use_type clause
2691 ------------------------------
2692 -- Preserve_Full_Attributes --
2693 ------------------------------
2695 procedure Preserve_Full_Attributes
2699 Full_Base
: constant Entity_Id
:= Base_Type
(Full
);
2700 Priv_Is_Base_Type
: constant Boolean := Is_Base_Type
(Priv
);
2703 Set_Size_Info
(Priv
, Full
);
2704 Set_RM_Size
(Priv
, RM_Size
(Full
));
2705 Set_Size_Known_At_Compile_Time
2706 (Priv
, Size_Known_At_Compile_Time
(Full
));
2707 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
2708 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
2709 Set_Is_Ada_2005_Only
(Priv
, Is_Ada_2005_Only
(Full
));
2710 Set_Is_Ada_2012_Only
(Priv
, Is_Ada_2012_Only
(Full
));
2711 Set_Has_Pragma_Unmodified
(Priv
, Has_Pragma_Unmodified
(Full
));
2712 Set_Has_Pragma_Unreferenced
(Priv
, Has_Pragma_Unreferenced
(Full
));
2713 Set_Has_Pragma_Unreferenced_Objects
2714 (Priv
, Has_Pragma_Unreferenced_Objects
2716 if Is_Unchecked_Union
(Full
) then
2717 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
2719 -- Why is atomic not copied here ???
2721 if Referenced
(Full
) then
2722 Set_Referenced
(Priv
);
2725 if Priv_Is_Base_Type
then
2726 Set_Is_Controlled_Active
2727 (Priv
, Is_Controlled_Active
(Full_Base
));
2728 Set_Finalize_Storage_Only
2729 (Priv
, Finalize_Storage_Only
(Full_Base
));
2730 Set_Has_Controlled_Component
2731 (Priv
, Has_Controlled_Component
(Full_Base
));
2733 Propagate_Concurrent_Flags
(Priv
, Base_Type
(Full
));
2736 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
2738 -- Propagate Default_Initial_Condition-related attributes from the
2739 -- base type of the full view to the full view and vice versa. This
2740 -- may seem strange, but is necessary depending on which type
2741 -- triggered the generation of the DIC procedure body. As a result,
2742 -- both the full view and its base type carry the same DIC-related
2745 Propagate_DIC_Attributes
(Full
, From_Typ
=> Full_Base
);
2746 Propagate_DIC_Attributes
(Full_Base
, From_Typ
=> Full
);
2748 -- Propagate Default_Initial_Condition-related attributes from the
2749 -- full view to the private view.
2751 Propagate_DIC_Attributes
(Priv
, From_Typ
=> Full
);
2753 -- Propagate invariant-related attributes from the base type of the
2754 -- full view to the full view and vice versa. This may seem strange,
2755 -- but is necessary depending on which type triggered the generation
2756 -- of the invariant procedure body. As a result, both the full view
2757 -- and its base type carry the same invariant-related information.
2759 Propagate_Invariant_Attributes
(Full
, From_Typ
=> Full_Base
);
2760 Propagate_Invariant_Attributes
(Full_Base
, From_Typ
=> Full
);
2762 -- Propagate invariant-related attributes from the full view to the
2765 Propagate_Invariant_Attributes
(Priv
, From_Typ
=> Full
);
2767 if Is_Tagged_Type
(Priv
)
2768 and then Is_Tagged_Type
(Full
)
2769 and then not Error_Posted
(Full
)
2771 if Is_Tagged_Type
(Priv
) then
2773 -- If the type is tagged, the tag itself must be available on
2774 -- the partial view, for expansion purposes.
2776 Set_First_Entity
(Priv
, First_Entity
(Full
));
2778 -- If there are discriminants in the partial view, these remain
2779 -- visible. Otherwise only the tag itself is visible, and there
2780 -- are no nameable components in the partial view.
2782 if No
(Last_Entity
(Priv
)) then
2783 Set_Last_Entity
(Priv
, First_Entity
(Priv
));
2787 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
2789 if Has_Discriminants
(Full
) then
2790 Set_Discriminant_Constraint
(Priv
,
2791 Discriminant_Constraint
(Full
));
2794 end Preserve_Full_Attributes
;
2800 function Type_In_Use
(T
: Entity_Id
) return Boolean is
2802 return Scope
(Base_Type
(T
)) = P
2803 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
2806 -- Start of processing for Uninstall_Declarations
2809 Id
:= First_Entity
(P
);
2810 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2811 if Debug_Flag_E
then
2812 Write_Str
("unlinking visible entity ");
2813 Write_Int
(Int
(Id
));
2817 -- On exit from the package scope, we must preserve the visibility
2818 -- established by use clauses in the current scope. Two cases:
2820 -- a) If the entity is an operator, it may be a primitive operator of
2821 -- a type for which there is a visible use-type clause.
2823 -- b) For other entities, their use-visibility is determined by a
2824 -- visible use clause for the package itself or a use-all-type clause
2825 -- applied directly to the entity's type. For a generic instance,
2826 -- the instantiation of the formals appears in the visible part,
2827 -- but the formals are private and remain so.
2829 if Ekind
(Id
) = E_Function
2830 and then Is_Operator_Symbol_Name
(Chars
(Id
))
2831 and then not Is_Hidden
(Id
)
2832 and then not Error_Posted
(Id
)
2834 Set_Is_Potentially_Use_Visible
(Id
,
2836 or else Type_In_Use
(Etype
(Id
))
2837 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
2838 or else (Present
(Next_Formal
(First_Formal
(Id
)))
2841 (Etype
(Next_Formal
(First_Formal
(Id
))))));
2843 if In_Use
(P
) and then not Is_Hidden
(Id
) then
2845 -- A child unit of a use-visible package remains use-visible
2846 -- only if it is itself a visible child unit. Otherwise it
2847 -- would remain visible in other contexts where P is use-
2848 -- visible, because once compiled it stays in the entity list
2849 -- of its parent unit.
2851 if Is_Child_Unit
(Id
) then
2852 Set_Is_Potentially_Use_Visible
2853 (Id
, Is_Visible_Lib_Unit
(Id
));
2855 Set_Is_Potentially_Use_Visible
(Id
);
2858 -- We need to avoid incorrectly marking enumeration literals as
2859 -- non-visible when a visible use-all-type clause is in effect.
2861 elsif Type_In_Use
(Etype
(Id
))
2862 and then Nkind
(Current_Use_Clause
(Etype
(Id
))) =
2864 and then All_Present
(Current_Use_Clause
(Etype
(Id
)))
2869 Set_Is_Potentially_Use_Visible
(Id
, False);
2873 -- Local entities are not immediately visible outside of the package
2875 Set_Is_Immediately_Visible
(Id
, False);
2877 -- If this is a private type with a full view (for example a local
2878 -- subtype of a private type declared elsewhere), ensure that the
2879 -- full view is also removed from visibility: it may be exposed when
2880 -- swapping views in an instantiation. Similarly, ensure that the
2881 -- use-visibility is properly set on both views.
2883 if Is_Type
(Id
) and then Present
(Full_View
(Id
)) then
2884 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
2885 Set_Is_Potentially_Use_Visible
(Full_View
(Id
),
2886 Is_Potentially_Use_Visible
(Id
));
2889 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2890 Check_Abstract_Overriding
(Id
);
2891 Check_Conventions
(Id
);
2894 if Ekind_In
(Id
, E_Private_Type
, E_Limited_Private_Type
)
2895 and then No
(Full_View
(Id
))
2896 and then not Is_Generic_Type
(Id
)
2897 and then not Is_Derived_Type
(Id
)
2899 Error_Msg_N
("missing full declaration for private type&", Id
);
2901 elsif Ekind
(Id
) = E_Record_Type_With_Private
2902 and then not Is_Generic_Type
(Id
)
2903 and then No
(Full_View
(Id
))
2905 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
2906 Error_Msg_N
("missing full declaration for private type&", Id
);
2909 ("missing full declaration for private extension", Id
);
2912 -- Case of constant, check for deferred constant declaration with
2913 -- no full view. Likely just a matter of a missing expression, or
2914 -- accidental use of the keyword constant.
2916 elsif Ekind
(Id
) = E_Constant
2918 -- OK if constant value present
2920 and then No
(Constant_Value
(Id
))
2922 -- OK if full view present
2924 and then No
(Full_View
(Id
))
2926 -- OK if imported, since that provides the completion
2928 and then not Is_Imported
(Id
)
2930 -- OK if object declaration replaced by renaming declaration as
2931 -- a result of OK_To_Rename processing (e.g. for concatenation)
2933 and then Nkind
(Parent
(Id
)) /= N_Object_Renaming_Declaration
2935 -- OK if object declaration with the No_Initialization flag set
2937 and then not (Nkind
(Parent
(Id
)) = N_Object_Declaration
2938 and then No_Initialization
(Parent
(Id
)))
2940 -- If no private declaration is present, we assume the user did
2941 -- not intend a deferred constant declaration and the problem
2942 -- is simply that the initializing expression is missing.
2944 if not Has_Private_Declaration
(Etype
(Id
)) then
2946 -- We assume that the user did not intend a deferred constant
2947 -- declaration, and the expression is just missing.
2950 ("constant declaration requires initialization expression",
2953 if Is_Limited_Type
(Etype
(Id
)) then
2955 ("\if variable intended, remove CONSTANT from declaration",
2959 -- Otherwise if a private declaration is present, then we are
2960 -- missing the full declaration for the deferred constant.
2964 ("missing full declaration for deferred constant (RM 7.4)",
2967 if Is_Limited_Type
(Etype
(Id
)) then
2969 ("\if variable intended, remove CONSTANT from declaration",
2978 -- If the specification was installed as the parent of a public child
2979 -- unit, the private declarations were not installed, and there is
2982 if not In_Private_Part
(P
) then
2985 Set_In_Private_Part
(P
, False);
2988 -- Make private entities invisible and exchange full and private
2989 -- declarations for private types. Id is now the first private entity
2992 while Present
(Id
) loop
2993 if Debug_Flag_E
then
2994 Write_Str
("unlinking private entity ");
2995 Write_Int
(Int
(Id
));
2999 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
3000 Check_Abstract_Overriding
(Id
);
3001 Check_Conventions
(Id
);
3004 Set_Is_Immediately_Visible
(Id
, False);
3006 if Is_Private_Base_Type
(Id
) and then Present
(Full_View
(Id
)) then
3007 Full
:= Full_View
(Id
);
3009 -- If the partial view is not declared in the visible part of the
3010 -- package (as is the case when it is a type derived from some
3011 -- other private type in the private part of the current package),
3012 -- no exchange takes place.
3015 or else List_Containing
(Parent
(Id
)) /=
3016 Visible_Declarations
(Specification
(Decl
))
3021 -- The entry in the private part points to the full declaration,
3022 -- which is currently visible. Exchange them so only the private
3023 -- type declaration remains accessible, and link private and full
3024 -- declaration in the opposite direction. Before the actual
3025 -- exchange, we copy back attributes of the full view that must
3026 -- be available to the partial view too.
3028 Preserve_Full_Attributes
(Id
, Full
);
3030 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
3032 -- The following test may be redundant, as this is already
3033 -- diagnosed in sem_ch3. ???
3035 if not Is_Definite_Subtype
(Full
)
3036 and then Is_Definite_Subtype
(Id
)
3038 Error_Msg_Sloc
:= Sloc
(Parent
(Id
));
3040 ("full view of& not compatible with declaration#", Full
, Id
);
3043 -- Swap out the subtypes and derived types of Id that
3044 -- were compiled in this scope, or installed previously
3045 -- by Install_Private_Declarations.
3047 -- Before we do the swap, we verify the presence of the Full_View
3048 -- field which may be empty due to a swap by a previous call to
3049 -- End_Package_Scope (e.g. from the freezing mechanism).
3051 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
3052 while Present
(Priv_Elmt
) loop
3053 Priv_Sub
:= Node
(Priv_Elmt
);
3055 if Present
(Full_View
(Priv_Sub
)) then
3056 if Scope
(Priv_Sub
) = P
3057 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
3059 Set_Is_Immediately_Visible
(Priv_Sub
, False);
3062 if Is_Visible_Dependent
(Priv_Sub
) then
3063 Preserve_Full_Attributes
3064 (Priv_Sub
, Full_View
(Priv_Sub
));
3065 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
3066 Exchange_Declarations
(Priv_Sub
);
3070 Next_Elmt
(Priv_Elmt
);
3073 -- Now restore the type itself to its private view
3075 Exchange_Declarations
(Id
);
3077 -- If we have installed an underlying full view for a type derived
3078 -- from a private type in a child unit, restore the proper views
3079 -- of private and full view. See corresponding code in
3080 -- Install_Private_Declarations.
3082 -- After the exchange, Full denotes the private type in the
3083 -- visible part of the package.
3085 if Is_Private_Base_Type
(Full
)
3086 and then Present
(Full_View
(Full
))
3087 and then Present
(Underlying_Full_View
(Full
))
3088 and then In_Package_Body
(Current_Scope
)
3090 Set_Full_View
(Full
, Underlying_Full_View
(Full
));
3091 Set_Underlying_Full_View
(Full
, Empty
);
3094 elsif Ekind
(Id
) = E_Incomplete_Type
3095 and then Comes_From_Source
(Id
)
3096 and then No
(Full_View
(Id
))
3098 -- Mark Taft amendment types. Verify that there are no primitive
3099 -- operations declared for the type (3.10.1(9)).
3101 Set_Has_Completion_In_Body
(Id
);
3108 Elmt
:= First_Elmt
(Private_Dependents
(Id
));
3109 while Present
(Elmt
) loop
3110 Subp
:= Node
(Elmt
);
3112 -- Is_Primitive is tested because there can be cases where
3113 -- nonprimitive subprograms (in nested packages) are added
3114 -- to the Private_Dependents list.
3116 if Is_Overloadable
(Subp
) and then Is_Primitive
(Subp
) then
3118 ("type& must be completed in the private part",
3121 -- The result type of an access-to-function type cannot be a
3122 -- Taft-amendment type, unless the version is Ada 2012 or
3123 -- later (see AI05-151).
3125 elsif Ada_Version
< Ada_2012
3126 and then Ekind
(Subp
) = E_Subprogram_Type
3128 if Etype
(Subp
) = Id
3130 (Is_Class_Wide_Type
(Etype
(Subp
))
3131 and then Etype
(Etype
(Subp
)) = Id
)
3134 ("type& must be completed in the private part",
3135 Associated_Node_For_Itype
(Subp
), Id
);
3143 elsif not Is_Child_Unit
(Id
)
3144 and then (not Is_Private_Type
(Id
) or else No
(Full_View
(Id
)))
3147 Set_Is_Potentially_Use_Visible
(Id
, False);
3153 end Uninstall_Declarations
;
3155 ------------------------
3156 -- Unit_Requires_Body --
3157 ------------------------
3159 function Unit_Requires_Body
3160 (Pack_Id
: Entity_Id
;
3161 Do_Abstract_States
: Boolean := False) return Boolean
3165 Requires_Body
: Boolean := False;
3166 -- Flag set when the unit has at least one construct that requries
3167 -- completion in a body.
3170 -- Imported entity never requires body. Right now, only subprograms can
3171 -- be imported, but perhaps in the future we will allow import of
3174 if Is_Imported
(Pack_Id
) then
3177 -- Body required if library package with pragma Elaborate_Body
3179 elsif Has_Pragma_Elaborate_Body
(Pack_Id
) then
3182 -- Body required if subprogram
3184 elsif Is_Subprogram_Or_Generic_Subprogram
(Pack_Id
) then
3187 -- Treat a block as requiring a body
3189 elsif Ekind
(Pack_Id
) = E_Block
then
3192 elsif Ekind
(Pack_Id
) = E_Package
3193 and then Nkind
(Parent
(Pack_Id
)) = N_Package_Specification
3194 and then Present
(Generic_Parent
(Parent
(Pack_Id
)))
3197 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(Pack_Id
));
3199 if Has_Pragma_Elaborate_Body
(G_P
) then
3205 -- Traverse the entity chain of the package and look for constructs that
3206 -- require a completion in a body.
3208 E
:= First_Entity
(Pack_Id
);
3209 while Present
(E
) loop
3211 -- Skip abstract states because their completion depends on several
3212 -- criteria (see below).
3214 if Ekind
(E
) = E_Abstract_State
then
3217 elsif Requires_Completion_In_Body
3218 (E
, Pack_Id
, Do_Abstract_States
)
3220 Requires_Body
:= True;
3227 -- A [generic] package that defines at least one non-null abstract state
3228 -- requires a completion only when at least one other construct requires
3229 -- a completion in a body (SPARK RM 7.1.4(4) and (6)). This check is not
3230 -- performed if the caller requests this behavior.
3232 if Do_Abstract_States
3233 and then Ekind_In
(Pack_Id
, E_Generic_Package
, E_Package
)
3234 and then Has_Non_Null_Abstract_State
(Pack_Id
)
3235 and then Requires_Body
3240 return Requires_Body
;
3241 end Unit_Requires_Body
;
3243 -----------------------------
3244 -- Unit_Requires_Body_Info --
3245 -----------------------------
3247 procedure Unit_Requires_Body_Info
(Pack_Id
: Entity_Id
) is
3251 -- An imported entity never requires body. Right now, only subprograms
3252 -- can be imported, but perhaps in the future we will allow import of
3255 if Is_Imported
(Pack_Id
) then
3258 -- Body required if library package with pragma Elaborate_Body
3260 elsif Has_Pragma_Elaborate_Body
(Pack_Id
) then
3261 Error_Msg_N
("info: & requires body (Elaborate_Body)?Y?", Pack_Id
);
3263 -- Body required if subprogram
3265 elsif Is_Subprogram_Or_Generic_Subprogram
(Pack_Id
) then
3266 Error_Msg_N
("info: & requires body (subprogram case)?Y?", Pack_Id
);
3268 -- Body required if generic parent has Elaborate_Body
3270 elsif Ekind
(Pack_Id
) = E_Package
3271 and then Nkind
(Parent
(Pack_Id
)) = N_Package_Specification
3272 and then Present
(Generic_Parent
(Parent
(Pack_Id
)))
3275 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(Pack_Id
));
3277 if Has_Pragma_Elaborate_Body
(G_P
) then
3279 ("info: & requires body (generic parent Elaborate_Body)?Y?",
3284 -- A [generic] package that introduces at least one non-null abstract
3285 -- state requires completion. However, there is a separate rule that
3286 -- requires that such a package have a reason other than this for a
3287 -- body being required (if necessary a pragma Elaborate_Body must be
3288 -- provided). If Ignore_Abstract_State is True, we don't do this check
3289 -- (so we can use Unit_Requires_Body to check for some other reason).
3291 elsif Ekind_In
(Pack_Id
, E_Generic_Package
, E_Package
)
3292 and then Present
(Abstract_States
(Pack_Id
))
3293 and then not Is_Null_State
3294 (Node
(First_Elmt
(Abstract_States
(Pack_Id
))))
3297 ("info: & requires body (non-null abstract state aspect)?Y?",
3301 -- Otherwise search entity chain for entity requiring completion
3303 E
:= First_Entity
(Pack_Id
);
3304 while Present
(E
) loop
3305 if Requires_Completion_In_Body
(E
, Pack_Id
) then
3306 Error_Msg_Node_2
:= E
;
3308 ("info: & requires body (& requires completion)?Y?", E
, Pack_Id
);
3313 end Unit_Requires_Body_Info
;