1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 -- 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 Top_Level
: Boolean := False) return Boolean;
264 -- A "referencer" is a construct which may reference a previous
265 -- declaration. Examine all declarations in list Decls in reverse
266 -- and determine whether once such referencer exists. All entities
267 -- in the range Last (Decls) .. Referencer are hidden from external
270 function Scan_Subprogram_Ref
(N
: Node_Id
) return Traverse_Result
;
271 -- Determine whether a node denotes a reference to a subprogram
273 procedure Traverse_And_Scan_Subprogram_Refs
is
274 new Traverse_Proc
(Scan_Subprogram_Ref
);
275 -- Subsidiary to routine Has_Referencer. Determine whether a node
276 -- contains references to a subprogram and record them.
277 -- WARNING: this is a very expensive routine as it performs a full
280 procedure Scan_Subprogram_Refs
(Node
: Node_Id
);
281 -- If we haven't already traversed Node, then mark it and traverse
288 function Has_Referencer
290 Top_Level
: Boolean := False) return Boolean
296 Has_Non_Subprograms_Referencer
: Boolean := False;
297 -- Set if an inlined subprogram body was detected as a referencer.
298 -- In this case, we do not return True immediately but keep hiding
299 -- subprograms from external visibility.
306 -- Examine all declarations in reverse order, hiding all entities
307 -- from external visibility until a referencer has been found. The
308 -- algorithm recurses into nested packages.
310 Decl
:= Last
(Decls
);
311 while Present
(Decl
) loop
313 -- A stub is always considered a referencer
315 if Nkind
(Decl
) in N_Body_Stub
then
318 -- Package declaration
320 elsif Nkind
(Decl
) = N_Package_Declaration
then
321 Spec
:= Specification
(Decl
);
323 -- Inspect the declarations of a non-generic package to try
324 -- and hide more entities from external visibility.
326 if not Is_Generic_Unit
(Defining_Entity
(Spec
)) then
327 if Has_Referencer
(Private_Declarations
(Spec
))
328 or else Has_Referencer
(Visible_Declarations
(Spec
))
336 elsif Nkind
(Decl
) = N_Package_Body
337 and then Present
(Corresponding_Spec
(Decl
))
339 Decl_Id
:= Corresponding_Spec
(Decl
);
341 -- A generic package body is a referencer. It would seem
342 -- that we only have to consider generics that can be
343 -- exported, i.e. where the corresponding spec is the
344 -- spec of the current package, but because of nested
345 -- instantiations, a fully private generic body may export
346 -- other private body entities. Furthermore, regardless of
347 -- whether there was a previous inlined subprogram, (an
348 -- instantiation of) the generic package may reference any
349 -- entity declared before it.
351 if Is_Generic_Unit
(Decl_Id
) then
354 -- Inspect the declarations of a non-generic package body to
355 -- try and hide more entities from external visibility.
357 elsif Has_Referencer
(Declarations
(Decl
)) then
363 elsif Nkind
(Decl
) = N_Subprogram_Body
then
364 if Present
(Corresponding_Spec
(Decl
)) then
365 Decl_Id
:= Corresponding_Spec
(Decl
);
367 -- A generic subprogram body acts as a referencer
369 if Is_Generic_Unit
(Decl_Id
) then
373 -- An inlined subprogram body acts as a referencer
375 -- Note that we test Has_Pragma_Inline here in addition
376 -- to Is_Inlined. We are doing this for a client, since
377 -- we are computing which entities should be public, and
378 -- it is the client who will decide if actual inlining
379 -- should occur, so we need to catch all cases where the
380 -- subprogram may be inlined by the client.
382 if Is_Inlined
(Decl_Id
)
383 or else Has_Pragma_Inline
(Decl_Id
)
385 Has_Non_Subprograms_Referencer
:= True;
387 -- Inspect the statements of the subprogram body
388 -- to determine whether the body references other
391 Scan_Subprogram_Refs
(Decl
);
394 -- Otherwise this is a stand alone subprogram body
397 Decl_Id
:= Defining_Entity
(Decl
);
399 -- An inlined subprogram body acts as a referencer
401 if Is_Inlined
(Decl_Id
)
402 or else Has_Pragma_Inline
(Decl_Id
)
404 Has_Non_Subprograms_Referencer
:= True;
406 -- Inspect the statements of the subprogram body
407 -- to determine whether the body references other
410 Scan_Subprogram_Refs
(Decl
);
412 -- Otherwise we can reset Is_Public right away
414 elsif not Subprogram_Table
.Get
(Decl_Id
) then
415 Set_Is_Public
(Decl_Id
, False);
421 elsif Nkind
(Decl
) = N_Freeze_Entity
then
424 pragma Unreferenced
(Discard
);
426 -- Inspect the actions to find references to subprograms
428 Discard
:= Has_Referencer
(Actions
(Decl
));
431 -- Exceptions, objects and renamings do not need to be public
432 -- if they are not followed by a construct which can reference
433 -- and export them. The Is_Public flag is reset on top level
434 -- entities only as anything nested is local to its context.
435 -- Likewise for subprograms, but we work harder for them.
437 elsif Nkind_In
(Decl
, N_Exception_Declaration
,
438 N_Object_Declaration
,
439 N_Object_Renaming_Declaration
,
440 N_Subprogram_Declaration
,
441 N_Subprogram_Renaming_Declaration
)
443 Decl_Id
:= Defining_Entity
(Decl
);
446 and then not Is_Imported
(Decl_Id
)
447 and then not Is_Exported
(Decl_Id
)
448 and then No
(Interface_Name
(Decl_Id
))
450 (not Has_Non_Subprograms_Referencer
451 or else (Nkind
(Decl
) = N_Subprogram_Declaration
452 and then not Subprogram_Table
.Get
(Decl_Id
)))
454 Set_Is_Public
(Decl_Id
, False);
457 -- For a subprogram renaming, if the entity is referenced,
458 -- then so is the renamed subprogram. But there is an issue
459 -- with generic bodies because instantiations are not done
460 -- yet and, therefore, cannot be scanned for referencers.
461 -- That's why we use an approximation and test that we have
462 -- at least one subprogram referenced by an inlined body
463 -- instead of precisely the entity of this renaming.
465 if Nkind
(Decl
) = N_Subprogram_Renaming_Declaration
466 and then Subprogram_Table
.Get_First
467 and then Is_Entity_Name
(Name
(Decl
))
468 and then Present
(Entity
(Name
(Decl
)))
469 and then Is_Subprogram
(Entity
(Name
(Decl
)))
471 Subprogram_Table
.Set
(Entity
(Name
(Decl
)), True);
478 return Has_Non_Subprograms_Referencer
;
481 -------------------------
482 -- Scan_Subprogram_Ref --
483 -------------------------
485 function Scan_Subprogram_Ref
(N
: Node_Id
) return Traverse_Result
is
487 -- Detect a reference of the form
490 if Nkind
(N
) in N_Subprogram_Call
491 and then Is_Entity_Name
(Name
(N
))
492 and then Present
(Entity
(Name
(N
)))
493 and then Is_Subprogram
(Entity
(Name
(N
)))
495 Subprogram_Table
.Set
(Entity
(Name
(N
)), True);
497 -- Detect a reference of the form
498 -- Subp'Some_Attribute
500 elsif Nkind
(N
) = N_Attribute_Reference
501 and then Is_Entity_Name
(Prefix
(N
))
502 and then Present
(Entity
(Prefix
(N
)))
503 and then Is_Subprogram
(Entity
(Prefix
(N
)))
505 Subprogram_Table
.Set
(Entity
(Prefix
(N
)), True);
507 -- Constants can be substituted by their value in gigi, which may
508 -- contain a reference, so scan the value recursively.
510 elsif Is_Entity_Name
(N
)
511 and then Present
(Entity
(N
))
512 and then Ekind
(Entity
(N
)) = E_Constant
515 Val
: constant Node_Id
:= Constant_Value
(Entity
(N
));
518 and then not Compile_Time_Known_Value
(Val
)
520 Scan_Subprogram_Refs
(Val
);
526 end Scan_Subprogram_Ref
;
528 --------------------------
529 -- Scan_Subprogram_Refs --
530 --------------------------
532 procedure Scan_Subprogram_Refs
(Node
: Node_Id
) is
534 if not Traversed_Table
.Get
(Node
) then
535 Traversed_Table
.Set
(Node
, True);
536 Traverse_And_Scan_Subprogram_Refs
(Node
);
538 end Scan_Subprogram_Refs
;
543 pragma Unreferenced
(Discard
);
545 -- Start of processing for Hide_Public_Entities
548 -- The algorithm examines the top level declarations of a package
549 -- body in reverse looking for a construct that may export entities
550 -- declared prior to it. If such a scenario is encountered, then all
551 -- entities in the range Last (Decls) .. construct are hidden from
552 -- external visibility. Consider:
560 -- package body Pack is
561 -- External_Obj : ...; -- (1)
563 -- package body Gen is -- (2)
564 -- ... External_Obj ... -- (3)
567 -- Local_Obj : ...; -- (4)
570 -- In this example Local_Obj (4) must not be externally visible as
571 -- it cannot be exported by anything in Pack. The body of generic
572 -- package Gen (2) on the other hand acts as a "referencer" and may
573 -- export anything declared before it. Since the compiler does not
574 -- perform flow analysis, it is not possible to determine precisely
575 -- which entities will be exported when Gen is instantiated. In the
576 -- example above External_Obj (1) is exported at (3), but this may
577 -- not always be the case. The algorithm takes a conservative stance
578 -- and leaves entity External_Obj public.
580 -- This very conservative algorithm is supplemented by a more precise
581 -- processing for inlined bodies. For them, we traverse the syntactic
582 -- tree and record which subprograms are actually referenced from it.
583 -- This makes it possible to compute a much smaller set of externally
584 -- visible subprograms in the absence of generic bodies, which can
585 -- have a significant impact on the inlining decisions made in the
586 -- back end and the removal of out-of-line bodies from the object
587 -- code. We do it only for inlined bodies because they are supposed
588 -- to be reasonably small and tree traversal is very expensive.
590 -- Note that even this special processing is not optimal for inlined
591 -- bodies, because we treat all inlined subprograms alike. An optimal
592 -- algorithm would require computing the transitive closure of the
593 -- inlined subprograms that can really be referenced from other units
594 -- in the source code.
596 -- We could extend this processing for inlined bodies and record all
597 -- entities, not just subprograms, referenced from them, which would
598 -- make it possible to compute a much smaller set of all externally
599 -- visible entities in the absence of generic bodies. But this would
600 -- mean implementing a more thorough tree traversal of the bodies,
601 -- i.e. not just syntactic, and the gain would very likely be worth
602 -- neither the hassle nor the slowdown of the compiler.
604 -- Finally, an important thing to be aware of is that, at this point,
605 -- instantiations are not done yet so we cannot directly see inlined
606 -- bodies coming from them. That's not catastrophic because only the
607 -- actual parameters of the instantiations matter here, and they are
608 -- present in the declarations list of the instantiated packages.
610 Traversed_Table
.Reset
;
611 Subprogram_Table
.Reset
;
612 Discard
:= Has_Referencer
(Decls
, Top_Level
=> True);
613 end Hide_Public_Entities
;
615 ----------------------------------
616 -- Install_Composite_Operations --
617 ----------------------------------
619 procedure Install_Composite_Operations
(P
: Entity_Id
) is
623 Id
:= First_Entity
(P
);
624 while Present
(Id
) loop
626 and then (Is_Limited_Composite
(Id
)
627 or else Is_Private_Composite
(Id
))
628 and then No
(Private_Component
(Id
))
630 Set_Is_Limited_Composite
(Id
, False);
631 Set_Is_Private_Composite
(Id
, False);
636 end Install_Composite_Operations
;
640 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
641 Saved_ISMP
: constant Boolean :=
642 Ignore_SPARK_Mode_Pragmas_In_Instance
;
643 -- Save the Ghost and SPARK mode-related data to restore on exit
647 Last_Spec_Entity
: Entity_Id
;
652 -- Start of processing for Analyze_Package_Body_Helper
655 -- Find corresponding package specification, and establish the current
656 -- scope. The visible defining entity for the package is the defining
657 -- occurrence in the spec. On exit from the package body, all body
658 -- declarations are attached to the defining entity for the body, but
659 -- the later is never used for name resolution. In this fashion there
660 -- is only one visible entity that denotes the package.
662 -- Set Body_Id. Note that this will be reset to point to the generic
663 -- copy later on in the generic case.
665 Body_Id
:= Defining_Entity
(N
);
667 -- Body is body of package instantiation. Corresponding spec has already
670 if Present
(Corresponding_Spec
(N
)) then
671 Spec_Id
:= Corresponding_Spec
(N
);
672 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
675 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
678 and then Is_Package_Or_Generic_Package
(Spec_Id
)
680 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
682 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
683 Error_Msg_N
("cannot supply body for package renaming", N
);
686 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
687 Error_Msg_N
("redefinition of package body", N
);
692 Error_Msg_N
("missing specification for package body", N
);
696 if Is_Package_Or_Generic_Package
(Spec_Id
)
697 and then (Scope
(Spec_Id
) = Standard_Standard
698 or else Is_Child_Unit
(Spec_Id
))
699 and then not Unit_Requires_Body
(Spec_Id
)
701 if Ada_Version
= Ada_83
then
703 ("optional package body (not allowed in Ada 95)??", N
);
705 Error_Msg_N
("spec of this package does not allow a body", N
);
710 -- A [generic] package body freezes the contract of the nearest
711 -- enclosing package body and all other contracts encountered in
712 -- the same declarative part up to and excluding the package body:
714 -- package body Nearest_Enclosing_Package
715 -- with Refined_State => (State => Constit)
719 -- package body Freezes_Enclosing_Package_Body
720 -- with Refined_State => (State_2 => Constit_2)
725 -- with Refined_Depends => (Input => (Constit, Constit_2)) ...
727 -- This ensures that any annotations referenced by the contract of a
728 -- [generic] subprogram body declared within the current package body
729 -- are available. This form of freezing is decoupled from the usual
730 -- Freeze_xxx mechanism because it must also work in the context of
731 -- generics where normal freezing is disabled.
733 -- Only bodies coming from source should cause this type of freezing.
734 -- Instantiated generic bodies are excluded because their processing is
735 -- performed in a separate compilation pass which lacks enough semantic
736 -- information with respect to contract analysis. It is safe to suppress
737 -- the freezing of contracts in this case because this action already
738 -- took place at the end of the enclosing declarative part.
740 if Comes_From_Source
(N
)
741 and then not Is_Generic_Instance
(Spec_Id
)
743 Freeze_Previous_Contracts
(N
);
746 -- A package body is Ghost when the corresponding spec is Ghost. Set
747 -- the mode now to ensure that any nodes generated during analysis and
748 -- expansion are properly flagged as ignored Ghost.
750 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
752 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
753 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
755 if Is_Child_Unit
(Spec_Id
) then
756 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
758 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
761 Set_Is_Child_Unit
(Body_Id
);
764 -- Generic package case
766 if Ekind
(Spec_Id
) = E_Generic_Package
then
768 -- Disable expansion and perform semantic analysis on copy. The
769 -- unannotated body will be used in all instantiations.
771 Body_Id
:= Defining_Entity
(N
);
772 Set_Ekind
(Body_Id
, E_Package_Body
);
773 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
774 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
775 Set_Body_Entity
(Spec_Id
, Body_Id
);
776 Set_Spec_Entity
(Body_Id
, Spec_Id
);
778 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
781 -- Once the contents of the generic copy and the template are
782 -- swapped, do the same for their respective aspect specifications.
784 Exchange_Aspects
(N
, New_N
);
786 -- Collect all contract-related source pragmas found within the
787 -- template and attach them to the contract of the package body.
788 -- This contract is used in the capture of global references within
791 Create_Generic_Contract
(N
);
793 -- Update Body_Id to point to the copied node for the remainder of
796 Body_Id
:= Defining_Entity
(N
);
800 -- The Body_Id is that of the copied node in the generic case, the
801 -- current node otherwise. Note that N was rewritten above, so we must
802 -- be sure to get the latest Body_Id value.
804 Set_Ekind
(Body_Id
, E_Package_Body
);
805 Set_Body_Entity
(Spec_Id
, Body_Id
);
806 Set_Spec_Entity
(Body_Id
, Spec_Id
);
808 -- Defining name for the package body is not a visible entity: Only the
809 -- defining name for the declaration is visible.
811 Set_Etype
(Body_Id
, Standard_Void_Type
);
812 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
813 Set_Corresponding_Spec
(N
, Spec_Id
);
814 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
816 -- The body entity is not used for semantics or code generation, but
817 -- it is attached to the entity list of the enclosing scope to simplify
818 -- the listing of back-annotations for the types it main contain.
820 if Scope
(Spec_Id
) /= Standard_Standard
then
821 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
824 -- Indicate that we are currently compiling the body of the package
826 Set_In_Package_Body
(Spec_Id
);
827 Set_Has_Completion
(Spec_Id
);
828 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
830 if Has_Aspects
(N
) then
831 Analyze_Aspect_Specifications
(N
, Body_Id
);
834 Push_Scope
(Spec_Id
);
836 -- Set SPARK_Mode only for non-generic package
838 if Ekind
(Spec_Id
) = E_Package
then
839 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
840 Set_SPARK_Aux_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
841 Set_SPARK_Pragma_Inherited
(Body_Id
);
842 Set_SPARK_Aux_Pragma_Inherited
(Body_Id
);
844 -- A package body may be instantiated or inlined at a later pass.
845 -- Restore the state of Ignore_SPARK_Mode_Pragmas_In_Instance when
846 -- it applied to the package spec.
848 if Ignore_SPARK_Mode_Pragmas
(Spec_Id
) then
849 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
853 Set_Categorization_From_Pragmas
(N
);
855 Install_Visible_Declarations
(Spec_Id
);
856 Install_Private_Declarations
(Spec_Id
);
857 Install_Private_With_Clauses
(Spec_Id
);
858 Install_Composite_Operations
(Spec_Id
);
860 Check_Anonymous_Access_Types
(Spec_Id
, N
);
862 if Ekind
(Spec_Id
) = E_Generic_Package
then
863 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
866 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
867 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
869 -- This is a nested package, so it may be necessary to declare certain
870 -- inherited subprograms that are not yet visible because the parent
871 -- type's subprograms are now visible.
873 if Ekind
(Scope
(Spec_Id
)) = E_Package
874 and then Scope
(Spec_Id
) /= Standard_Standard
876 Declare_Inherited_Private_Subprograms
(Spec_Id
);
879 if Present
(Declarations
(N
)) then
880 Analyze_Declarations
(Declarations
(N
));
881 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
884 -- Verify that the SPARK_Mode of the body agrees with that of its spec
886 if Present
(SPARK_Pragma
(Body_Id
)) then
887 if Present
(SPARK_Aux_Pragma
(Spec_Id
)) then
888 if Get_SPARK_Mode_From_Annotation
(SPARK_Aux_Pragma
(Spec_Id
)) =
891 Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Body_Id
)) = On
893 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
894 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
895 Error_Msg_Sloc
:= Sloc
(SPARK_Aux_Pragma
(Spec_Id
));
897 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
901 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
902 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
903 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
905 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
909 -- Analyze_Declarations has caused freezing of all types. Now generate
910 -- bodies for RACW primitives and stream attributes, if any.
912 if Ekind
(Spec_Id
) = E_Package
and then Has_RACW
(Spec_Id
) then
914 -- Attach subprogram bodies to support RACWs declared in spec
916 Append_RACW_Bodies
(Declarations
(N
), Spec_Id
);
917 Analyze_List
(Declarations
(N
));
920 HSS
:= Handled_Statement_Sequence
(N
);
922 if Present
(HSS
) then
923 Process_End_Label
(HSS
, 't', Spec_Id
);
926 -- Check that elaboration code in a preelaborable package body is
927 -- empty other than null statements and labels (RM 10.2.1(6)).
929 Validate_Null_Statement_Sequence
(N
);
932 Validate_Categorization_Dependency
(N
, Spec_Id
);
933 Check_Completion
(Body_Id
);
935 -- Generate start of body reference. Note that we do this fairly late,
936 -- because the call will use In_Extended_Main_Source_Unit as a check,
937 -- and we want to make sure that Corresponding_Stub links are set
939 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
941 -- For a generic package, collect global references and mark them on
942 -- the original body so that they are not resolved again at the point
945 if Ekind
(Spec_Id
) /= E_Package
then
946 Save_Global_References
(Original_Node
(N
));
950 -- The entities of the package body have so far been chained onto the
951 -- declaration chain for the spec. That's been fine while we were in the
952 -- body, since we wanted them to be visible, but now that we are leaving
953 -- the package body, they are no longer visible, so we remove them from
954 -- the entity chain of the package spec entity, and copy them to the
955 -- entity chain of the package body entity, where they will never again
958 if Present
(Last_Spec_Entity
) then
959 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
960 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
961 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
962 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
965 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
966 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
967 Set_First_Entity
(Spec_Id
, Empty
);
968 Set_Last_Entity
(Spec_Id
, Empty
);
971 Update_Use_Clause_Chain
;
972 End_Package_Scope
(Spec_Id
);
974 -- All entities declared in body are not visible
980 E
:= First_Entity
(Body_Id
);
981 while Present
(E
) loop
982 Set_Is_Immediately_Visible
(E
, False);
983 Set_Is_Potentially_Use_Visible
(E
, False);
986 -- Child units may appear on the entity list (e.g. if they appear
987 -- in the context of a subunit) but they are not body entities.
989 if not Is_Child_Unit
(E
) then
990 Set_Is_Package_Body_Entity
(E
);
997 Check_References
(Body_Id
);
999 -- For a generic unit, check that the formal parameters are referenced,
1000 -- and that local variables are used, as for regular packages.
1002 if Ekind
(Spec_Id
) = E_Generic_Package
then
1003 Check_References
(Spec_Id
);
1006 -- At this point all entities of the package body are externally visible
1007 -- to the linker as their Is_Public flag is set to True. This proactive
1008 -- approach is necessary because an inlined or a generic body for which
1009 -- code is generated in other units may need to see these entities. Cut
1010 -- down the number of global symbols that do not neet public visibility
1011 -- as this has two beneficial effects:
1012 -- (1) It makes the compilation process more efficient.
1013 -- (2) It gives the code generator more leeway to optimize within each
1014 -- unit, especially subprograms.
1016 -- This is done only for top-level library packages or child units as
1017 -- the algorithm does a top-down traversal of the package body.
1019 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
1020 and then not Is_Generic_Unit
(Spec_Id
)
1022 Hide_Public_Entities
(Declarations
(N
));
1025 -- If expander is not active, then here is where we turn off the
1026 -- In_Package_Body flag, otherwise it is turned off at the end of the
1027 -- corresponding expansion routine. If this is an instance body, we need
1028 -- to qualify names of local entities, because the body may have been
1029 -- compiled as a preliminary to another instantiation.
1031 if not Expander_Active
then
1032 Set_In_Package_Body
(Spec_Id
, False);
1034 if Is_Generic_Instance
(Spec_Id
)
1035 and then Operating_Mode
= Generate_Code
1037 Qualify_Entity_Names
(N
);
1041 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
1042 Restore_Ghost_Mode
(Saved_GM
);
1043 end Analyze_Package_Body_Helper
;
1045 ---------------------------------
1046 -- Analyze_Package_Declaration --
1047 ---------------------------------
1049 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
1050 Id
: constant Node_Id
:= Defining_Entity
(N
);
1052 Is_Comp_Unit
: constant Boolean :=
1053 Nkind
(Parent
(N
)) = N_Compilation_Unit
;
1055 Body_Required
: Boolean;
1056 -- True when this package declaration requires a corresponding body
1059 if Debug_Flag_C
then
1060 Write_Str
("==> package spec ");
1061 Write_Name
(Chars
(Id
));
1062 Write_Str
(" from ");
1063 Write_Location
(Sloc
(N
));
1068 Generate_Definition
(Id
);
1070 Set_Ekind
(Id
, E_Package
);
1071 Set_Etype
(Id
, Standard_Void_Type
);
1073 -- Set SPARK_Mode from context
1075 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
1076 Set_SPARK_Aux_Pragma
(Id
, SPARK_Mode_Pragma
);
1077 Set_SPARK_Pragma_Inherited
(Id
);
1078 Set_SPARK_Aux_Pragma_Inherited
(Id
);
1080 -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in case
1081 -- the body of this package is instantiated or inlined later and out of
1082 -- context. The body uses this attribute to restore the value of the
1085 if Ignore_SPARK_Mode_Pragmas_In_Instance
then
1086 Set_Ignore_SPARK_Mode_Pragmas
(Id
);
1089 -- Analyze aspect specifications immediately, since we need to recognize
1090 -- things like Pure early enough to diagnose violations during analysis.
1092 if Has_Aspects
(N
) then
1093 Analyze_Aspect_Specifications
(N
, Id
);
1096 -- Ada 2005 (AI-217): Check if the package has been illegally named in
1097 -- a limited-with clause of its own context. In this case the error has
1098 -- been previously notified by Analyze_Context.
1100 -- limited with Pkg; -- ERROR
1101 -- package Pkg is ...
1103 if From_Limited_With
(Id
) then
1109 Set_Is_Pure
(Id
, Is_Pure
(Enclosing_Lib_Unit_Entity
));
1110 Set_Categorization_From_Pragmas
(N
);
1112 Analyze
(Specification
(N
));
1113 Validate_Categorization_Dependency
(N
, Id
);
1115 -- Determine whether the package requires a body. Abstract states are
1116 -- intentionally ignored because they do require refinement which can
1117 -- only come in a body, but at the same time they do not force the need
1118 -- for a body on their own (SPARK RM 7.1.4(4) and 7.2.2(3)).
1120 Body_Required
:= Unit_Requires_Body
(Id
);
1122 if not Body_Required
then
1124 -- If the package spec does not require an explicit body, then there
1125 -- are not entities requiring completion in the language sense. Call
1126 -- Check_Completion now to ensure that nested package declarations
1127 -- that require an implicit body get one. (In the case where a body
1128 -- is required, Check_Completion is called at the end of the body's
1129 -- declarative part.)
1133 -- If the package spec does not require an explicit body, then all
1134 -- abstract states declared in nested packages cannot possibly get
1135 -- a proper refinement (SPARK RM 7.2.2(3)). This check is performed
1136 -- only when the compilation unit is the main unit to allow for
1137 -- modular SPARK analysis where packages do not necessarily have
1140 if Is_Comp_Unit
then
1141 Check_State_Refinements
1143 Is_Main_Unit
=> Parent
(N
) = Cunit
(Main_Unit
));
1147 -- Set Body_Required indication on the compilation unit node
1149 if Is_Comp_Unit
then
1150 Set_Body_Required
(Parent
(N
), Body_Required
);
1153 End_Package_Scope
(Id
);
1155 -- For the declaration of a library unit that is a remote types package,
1156 -- check legality rules regarding availability of stream attributes for
1157 -- types that contain non-remote access values. This subprogram performs
1158 -- visibility tests that rely on the fact that we have exited the scope
1161 if Is_Comp_Unit
then
1162 Validate_RT_RAT_Component
(N
);
1165 if Debug_Flag_C
then
1167 Write_Str
("<== package spec ");
1168 Write_Name
(Chars
(Id
));
1169 Write_Str
(" from ");
1170 Write_Location
(Sloc
(N
));
1173 end Analyze_Package_Declaration
;
1175 -----------------------------------
1176 -- Analyze_Package_Specification --
1177 -----------------------------------
1179 -- Note that this code is shared for the analysis of generic package specs
1180 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
1182 procedure Analyze_Package_Specification
(N
: Node_Id
) is
1183 Id
: constant Entity_Id
:= Defining_Entity
(N
);
1184 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
1185 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
1186 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
1189 Public_Child
: Boolean;
1191 Private_With_Clauses_Installed
: Boolean := False;
1192 -- In Ada 2005, private with_clauses are visible in the private part
1193 -- of a nested package, even if it appears in the public part of the
1194 -- enclosing package. This requires a separate step to install these
1195 -- private_with_clauses, and remove them at the end of the nested
1198 procedure Check_One_Tagged_Type_Or_Extension_At_Most
;
1199 -- Issue an error in SPARK mode if a package specification contains
1200 -- more than one tagged type or type extension.
1202 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
1203 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
1204 -- Is_True_Constant) on all variables that are entities of Id, and on
1205 -- the chain whose first element is FE. A recursive call is made for all
1206 -- packages and generic packages.
1208 procedure Generate_Parent_References
;
1209 -- For a child unit, generate references to parent units, for
1210 -- GPS navigation purposes.
1212 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
1213 -- Child and Unit are entities of compilation units. True if Child
1214 -- is a public child of Parent as defined in 10.1.1
1216 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
1217 -- Reject completion of an incomplete or private type declarations
1218 -- having a known discriminant part by an unchecked union.
1220 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
1221 -- Given the package entity of a generic package instantiation or
1222 -- formal package whose corresponding generic is a child unit, installs
1223 -- the private declarations of each of the child unit's parents.
1224 -- This has to be done at the point of entering the instance package's
1225 -- private part rather than being done in Sem_Ch12.Install_Parent
1226 -- (which is where the parents' visible declarations are installed).
1228 ------------------------------------------------
1229 -- Check_One_Tagged_Type_Or_Extension_At_Most --
1230 ------------------------------------------------
1232 procedure Check_One_Tagged_Type_Or_Extension_At_Most
is
1235 procedure Check_Decls
(Decls
: List_Id
);
1236 -- Check that either Previous is Empty and Decls does not contain
1237 -- more than one tagged type or type extension, or Previous is
1238 -- already set and Decls contains no tagged type or type extension.
1244 procedure Check_Decls
(Decls
: List_Id
) is
1248 Decl
:= First
(Decls
);
1249 while Present
(Decl
) loop
1250 if Nkind
(Decl
) = N_Full_Type_Declaration
1251 and then Is_Tagged_Type
(Defining_Identifier
(Decl
))
1253 if No
(Previous
) then
1257 Error_Msg_Sloc
:= Sloc
(Previous
);
1258 Check_SPARK_05_Restriction
1259 ("at most one tagged type or type extension allowed",
1260 "\\ previous declaration#",
1269 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
1273 Check_Decls
(Vis_Decls
);
1275 if Present
(Priv_Decls
) then
1276 Check_Decls
(Priv_Decls
);
1278 end Check_One_Tagged_Type_Or_Extension_At_Most
;
1280 ---------------------
1281 -- Clear_Constants --
1282 ---------------------
1284 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
1288 -- Ignore package renamings, not interesting and they can cause self
1289 -- referential loops in the code below.
1291 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
1295 -- Note: in the loop below, the check for Next_Entity pointing back
1296 -- to the package entity may seem odd, but it is needed, because a
1297 -- package can contain a renaming declaration to itself, and such
1298 -- renamings are generated automatically within package instances.
1301 while Present
(E
) and then E
/= Id
loop
1302 if Is_Assignable
(E
) then
1303 Set_Never_Set_In_Source
(E
, False);
1304 Set_Is_True_Constant
(E
, False);
1305 Set_Current_Value
(E
, Empty
);
1306 Set_Is_Known_Null
(E
, False);
1307 Set_Last_Assignment
(E
, Empty
);
1309 if not Can_Never_Be_Null
(E
) then
1310 Set_Is_Known_Non_Null
(E
, False);
1313 elsif Is_Package_Or_Generic_Package
(E
) then
1314 Clear_Constants
(E
, First_Entity
(E
));
1315 Clear_Constants
(E
, First_Private_Entity
(E
));
1320 end Clear_Constants
;
1322 --------------------------------
1323 -- Generate_Parent_References --
1324 --------------------------------
1326 procedure Generate_Parent_References
is
1327 Decl
: constant Node_Id
:= Parent
(N
);
1330 if Id
= Cunit_Entity
(Main_Unit
)
1331 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
1333 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1335 elsif not Nkind_In
(Unit
(Cunit
(Main_Unit
)), N_Subprogram_Body
,
1338 -- If current unit is an ancestor of main unit, generate a
1339 -- reference to its own parent.
1343 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
1346 if Nkind
(Main_Spec
) = N_Package_Body
then
1347 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
1350 U
:= Parent_Spec
(Main_Spec
);
1351 while Present
(U
) loop
1352 if U
= Parent
(Decl
) then
1353 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1356 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
1360 U
:= Parent_Spec
(Unit
(U
));
1365 end Generate_Parent_References
;
1367 ---------------------
1368 -- Is_Public_Child --
1369 ---------------------
1371 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
1373 if not Is_Private_Descendant
(Child
) then
1376 if Child
= Unit
then
1377 return not Private_Present
(
1378 Parent
(Unit_Declaration_Node
(Child
)));
1380 return Is_Public_Child
(Scope
(Child
), Unit
);
1383 end Is_Public_Child
;
1385 ----------------------------------------
1386 -- Inspect_Unchecked_Union_Completion --
1387 ----------------------------------------
1389 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
1393 Decl
:= First
(Decls
);
1394 while Present
(Decl
) loop
1396 -- We are looking at an incomplete or private type declaration
1397 -- with a known_discriminant_part whose full view is an
1400 if Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
1401 N_Private_Type_Declaration
)
1402 and then Has_Discriminants
(Defining_Identifier
(Decl
))
1403 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
1405 Is_Unchecked_Union
(Full_View
(Defining_Identifier
(Decl
)))
1408 ("completion of discriminated partial view "
1409 & "cannot be an unchecked union",
1410 Full_View
(Defining_Identifier
(Decl
)));
1415 end Inspect_Unchecked_Union_Completion
;
1417 -----------------------------------------
1418 -- Install_Parent_Private_Declarations --
1419 -----------------------------------------
1421 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
1422 Inst_Par
: Entity_Id
;
1423 Gen_Par
: Entity_Id
;
1424 Inst_Node
: Node_Id
;
1427 Inst_Par
:= Inst_Id
;
1430 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
1431 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
1432 Inst_Node
:= Get_Unit_Instantiation_Node
(Inst_Par
);
1434 if Nkind_In
(Inst_Node
, N_Package_Instantiation
,
1435 N_Formal_Package_Declaration
)
1436 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
1438 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
1440 if Present
(Renamed_Entity
(Inst_Par
)) then
1441 Inst_Par
:= Renamed_Entity
(Inst_Par
);
1446 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
1448 -- Install the private declarations and private use clauses
1449 -- of a parent instance of the child instance, unless the
1450 -- parent instance private declarations have already been
1451 -- installed earlier in Analyze_Package_Specification, which
1452 -- happens when a generic child is instantiated, and the
1453 -- instance is a child of the parent instance.
1455 -- Installing the use clauses of the parent instance twice
1456 -- is both unnecessary and wrong, because it would cause the
1457 -- clauses to be chained to themselves in the use clauses
1458 -- list of the scope stack entry. That in turn would cause
1459 -- an endless loop from End_Use_Clauses upon scope exit.
1461 -- The parent is now fully visible. It may be a hidden open
1462 -- scope if we are currently compiling some child instance
1463 -- declared within it, but while the current instance is being
1464 -- compiled the parent is immediately visible. In particular
1465 -- its entities must remain visible if a stack save/restore
1466 -- takes place through a call to Rtsfind.
1468 if Present
(Gen_Par
) then
1469 if not In_Private_Part
(Inst_Par
) then
1470 Install_Private_Declarations
(Inst_Par
);
1471 Set_Use
(Private_Declarations
1473 (Unit_Declaration_Node
(Inst_Par
))));
1474 Set_Is_Hidden_Open_Scope
(Inst_Par
, False);
1477 -- If we've reached the end of the generic instance parents,
1478 -- then finish off by looping through the nongeneric parents
1479 -- and installing their private declarations.
1481 -- If one of the non-generic parents is itself on the scope
1482 -- stack, do not install its private declarations: they are
1483 -- installed in due time when the private part of that parent
1487 while Present
(Inst_Par
)
1488 and then Inst_Par
/= Standard_Standard
1489 and then (not In_Open_Scopes
(Inst_Par
)
1490 or else not In_Private_Part
(Inst_Par
))
1492 if Nkind
(Inst_Node
) = N_Formal_Package_Declaration
1494 not Is_Ancestor_Package
1495 (Inst_Par
, Cunit_Entity
(Current_Sem_Unit
))
1497 Install_Private_Declarations
(Inst_Par
);
1499 (Private_Declarations
1501 (Unit_Declaration_Node
(Inst_Par
))));
1502 Inst_Par
:= Scope
(Inst_Par
);
1515 end Install_Parent_Private_Declarations
;
1517 -- Start of processing for Analyze_Package_Specification
1520 if Present
(Vis_Decls
) then
1521 Analyze_Declarations
(Vis_Decls
);
1524 -- Inspect the entities defined in the package and ensure that all
1525 -- incomplete types have received full declarations. Build default
1526 -- initial condition and invariant procedures for all qualifying types.
1528 E
:= First_Entity
(Id
);
1529 while Present
(E
) loop
1531 -- Check on incomplete types
1533 -- AI05-0213: A formal incomplete type has no completion, and neither
1534 -- does the corresponding subtype in an instance.
1536 if Is_Incomplete_Type
(E
)
1537 and then No
(Full_View
(E
))
1538 and then not Is_Generic_Type
(E
)
1539 and then not From_Limited_With
(E
)
1540 and then not Is_Generic_Actual_Type
(E
)
1542 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
1548 if Is_Remote_Call_Interface
(Id
)
1549 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
1551 Validate_RCI_Declarations
(Id
);
1554 -- Save global references in the visible declarations, before installing
1555 -- private declarations of parent unit if there is one, because the
1556 -- privacy status of types defined in the parent will change. This is
1557 -- only relevant for generic child units, but is done in all cases for
1560 if Ekind
(Id
) = E_Generic_Package
1561 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1564 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1565 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1568 -- Insert the freezing nodes after the visible declarations to
1569 -- ensure that we analyze its aspects; needed to ensure that
1570 -- global entities referenced in the aspects are properly handled.
1572 if Ada_Version
>= Ada_2012
1573 and then Is_Non_Empty_List
(Vis_Decls
)
1574 and then Is_Empty_List
(Priv_Decls
)
1576 Insert_List_After_And_Analyze
1577 (Last
(Vis_Decls
), Freeze_Entity
(Id
, Last
(Vis_Decls
)));
1580 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1581 Save_Global_References
(Orig_Decl
);
1582 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1586 -- If package is a public child unit, then make the private declarations
1587 -- of the parent visible.
1589 Public_Child
:= False;
1593 Pack_Decl
: Node_Id
;
1598 Par_Spec
:= Parent_Spec
(Parent
(N
));
1600 -- If the package is formal package of an enclosing generic, it is
1601 -- transformed into a local generic declaration, and compiled to make
1602 -- its spec available. We need to retrieve the original generic to
1603 -- determine whether it is a child unit, and install its parents.
1607 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1609 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1610 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1613 if Present
(Par_Spec
) then
1614 Generate_Parent_References
;
1616 while Scope
(Par
) /= Standard_Standard
1617 and then Is_Public_Child
(Id
, Par
)
1618 and then In_Open_Scopes
(Par
)
1620 Public_Child
:= True;
1622 Install_Private_Declarations
(Par
);
1623 Install_Private_With_Clauses
(Par
);
1624 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1625 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1630 if Is_Compilation_Unit
(Id
) then
1631 Install_Private_With_Clauses
(Id
);
1633 -- The current compilation unit may include private with_clauses,
1634 -- which are visible in the private part of the current nested
1635 -- package, and have to be installed now. This is not done for
1636 -- nested instantiations, where the private with_clauses of the
1637 -- enclosing unit have no effect once the instantiation info is
1638 -- established and we start analyzing the package declaration.
1641 Comp_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
1643 if Is_Package_Or_Generic_Package
(Comp_Unit
)
1644 and then not In_Private_Part
(Comp_Unit
)
1645 and then not In_Instance
1647 Install_Private_With_Clauses
(Comp_Unit
);
1648 Private_With_Clauses_Installed
:= True;
1653 -- If this is a package associated with a generic instance or formal
1654 -- package, then the private declarations of each of the generic's
1655 -- parents must be installed at this point.
1657 if Is_Generic_Instance
(Id
) then
1658 Install_Parent_Private_Declarations
(Id
);
1661 -- Analyze private part if present. The flag In_Private_Part is reset
1662 -- in End_Package_Scope.
1664 L
:= Last_Entity
(Id
);
1666 if Present
(Priv_Decls
) then
1667 Set_In_Private_Part
(Id
);
1669 -- Upon entering a public child's private part, it may be necessary
1670 -- to declare subprograms that were derived in the package's visible
1671 -- part but not yet made visible.
1673 if Public_Child
then
1674 Declare_Inherited_Private_Subprograms
(Id
);
1677 Analyze_Declarations
(Priv_Decls
);
1679 -- Check the private declarations for incomplete deferred constants
1681 Inspect_Deferred_Constant_Completion
(Priv_Decls
);
1683 -- The first private entity is the immediate follower of the last
1684 -- visible entity, if there was one.
1687 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1689 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
1692 -- There may be inherited private subprograms that need to be declared,
1693 -- even in the absence of an explicit private part. If there are any
1694 -- public declarations in the package and the package is a public child
1695 -- unit, then an implicit private part is assumed.
1697 elsif Present
(L
) and then Public_Child
then
1698 Set_In_Private_Part
(Id
);
1699 Declare_Inherited_Private_Subprograms
(Id
);
1700 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1703 E
:= First_Entity
(Id
);
1704 while Present
(E
) loop
1706 -- Check rule of 3.6(11), which in general requires waiting till all
1707 -- full types have been seen.
1709 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1710 Check_Aliased_Component_Types
(E
);
1713 -- Check preelaborable initialization for full type completing a
1714 -- private type for which pragma Preelaborable_Initialization given.
1717 and then Must_Have_Preelab_Init
(E
)
1718 and then not Has_Preelaborable_Initialization
(E
)
1721 ("full view of & does not have preelaborable initialization", E
);
1727 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1728 -- declaration having a known_discriminant_part shall not be an
1729 -- unchecked union type.
1731 if Present
(Vis_Decls
) then
1732 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1735 if Present
(Priv_Decls
) then
1736 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1739 if Ekind
(Id
) = E_Generic_Package
1740 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1741 and then Present
(Priv_Decls
)
1743 -- Save global references in private declarations, ignoring the
1744 -- visible declarations that were processed earlier.
1747 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1748 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1749 Save_Form
: constant List_Id
:=
1750 Generic_Formal_Declarations
(Orig_Decl
);
1753 -- Insert the freezing nodes after the private declarations to
1754 -- ensure that we analyze its aspects; needed to ensure that
1755 -- global entities referenced in the aspects are properly handled.
1757 if Ada_Version
>= Ada_2012
1758 and then Is_Non_Empty_List
(Priv_Decls
)
1760 Insert_List_After_And_Analyze
1761 (Last
(Priv_Decls
), Freeze_Entity
(Id
, Last
(Priv_Decls
)));
1764 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1765 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1766 Save_Global_References
(Orig_Decl
);
1767 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1768 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1772 Process_End_Label
(N
, 'e', Id
);
1774 -- Remove private_with_clauses of enclosing compilation unit, if they
1777 if Private_With_Clauses_Installed
then
1778 Remove_Private_With_Clauses
(Cunit
(Current_Sem_Unit
));
1781 -- For the case of a library level package, we must go through all the
1782 -- entities clearing the indications that the value may be constant and
1783 -- not modified. Why? Because any client of this package may modify
1784 -- these values freely from anywhere. This also applies to any nested
1785 -- packages or generic packages.
1787 -- For now we unconditionally clear constants for packages that are
1788 -- instances of generic packages. The reason is that we do not have the
1789 -- body yet, and we otherwise think things are unreferenced when they
1790 -- are not. This should be fixed sometime (the effect is not terrible,
1791 -- we just lose some warnings, and also some cases of value propagation)
1794 if Is_Library_Level_Entity
(Id
)
1795 or else Is_Generic_Instance
(Id
)
1797 Clear_Constants
(Id
, First_Entity
(Id
));
1798 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1801 -- Issue an error in SPARK mode if a package specification contains
1802 -- more than one tagged type or type extension.
1804 Check_One_Tagged_Type_Or_Extension_At_Most
;
1806 -- Output relevant information as to why the package requires a body.
1807 -- Do not consider generated packages as this exposes internal symbols
1808 -- and leads to confusing messages.
1810 if List_Body_Required_Info
1811 and then In_Extended_Main_Source_Unit
(Id
)
1812 and then Unit_Requires_Body
(Id
)
1813 and then Comes_From_Source
(Id
)
1815 Unit_Requires_Body_Info
(Id
);
1818 -- Nested package specs that do not require bodies are not checked for
1819 -- ineffective use clauses due to the possbility of subunits. This is
1820 -- because at this stage it is impossible to tell whether there will be
1823 if not Unit_Requires_Body
(Id
)
1824 and then Is_Compilation_Unit
(Id
)
1825 and then not Is_Private_Descendant
(Id
)
1827 Update_Use_Clause_Chain
;
1829 end Analyze_Package_Specification
;
1831 --------------------------------------
1832 -- Analyze_Private_Type_Declaration --
1833 --------------------------------------
1835 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1836 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1837 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1840 Generate_Definition
(Id
);
1841 Set_Is_Pure
(Id
, PF
);
1842 Init_Size_Align
(Id
);
1844 if not Is_Package_Or_Generic_Package
(Current_Scope
)
1845 or else In_Private_Part
(Current_Scope
)
1847 Error_Msg_N
("invalid context for private declaration", N
);
1850 New_Private_Type
(N
, Id
, N
);
1851 Set_Depends_On_Private
(Id
);
1853 -- Set the SPARK mode from the current context
1855 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
1856 Set_SPARK_Pragma_Inherited
(Id
);
1858 if Has_Aspects
(N
) then
1859 Analyze_Aspect_Specifications
(N
, Id
);
1861 end Analyze_Private_Type_Declaration
;
1863 ----------------------------------
1864 -- Check_Anonymous_Access_Types --
1865 ----------------------------------
1867 procedure Check_Anonymous_Access_Types
1868 (Spec_Id
: Entity_Id
;
1875 -- Itype references are only needed by gigi, to force elaboration of
1876 -- itypes. In the absence of code generation, they are not needed.
1878 if not Expander_Active
then
1882 E
:= First_Entity
(Spec_Id
);
1883 while Present
(E
) loop
1884 if Ekind
(E
) = E_Anonymous_Access_Type
1885 and then From_Limited_With
(E
)
1887 IR
:= Make_Itype_Reference
(Sloc
(P_Body
));
1890 if No
(Declarations
(P_Body
)) then
1891 Set_Declarations
(P_Body
, New_List
(IR
));
1893 Prepend
(IR
, Declarations
(P_Body
));
1899 end Check_Anonymous_Access_Types
;
1901 -------------------------------------------
1902 -- Declare_Inherited_Private_Subprograms --
1903 -------------------------------------------
1905 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1907 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1908 -- Check whether an inherited subprogram S is an operation of an
1909 -- untagged derived type T.
1911 ---------------------
1912 -- Is_Primitive_Of --
1913 ---------------------
1915 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1919 -- If the full view is a scalar type, the type is the anonymous base
1920 -- type, but the operation mentions the first subtype, so check the
1921 -- signature against the base type.
1923 if Base_Type
(Etype
(S
)) = Base_Type
(T
) then
1927 Formal
:= First_Formal
(S
);
1928 while Present
(Formal
) loop
1929 if Base_Type
(Etype
(Formal
)) = Base_Type
(T
) then
1933 Next_Formal
(Formal
);
1938 end Is_Primitive_Of
;
1945 Op_Elmt_2
: Elmt_Id
;
1946 Prim_Op
: Entity_Id
;
1947 New_Op
: Entity_Id
:= Empty
;
1948 Parent_Subp
: Entity_Id
;
1951 -- Start of processing for Declare_Inherited_Private_Subprograms
1954 E
:= First_Entity
(Id
);
1955 while Present
(E
) loop
1957 -- If the entity is a nonprivate type extension whose parent type
1958 -- is declared in an open scope, then the type may have inherited
1959 -- operations that now need to be made visible. Ditto if the entity
1960 -- is a formal derived type in a child unit.
1962 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1964 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1965 and then Is_Generic_Type
(E
)))
1966 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1967 and then Is_Base_Type
(E
)
1969 if Is_Tagged_Type
(E
) then
1970 Op_List
:= Primitive_Operations
(E
);
1972 Tag
:= First_Tag_Component
(E
);
1974 Op_Elmt
:= First_Elmt
(Op_List
);
1975 while Present
(Op_Elmt
) loop
1976 Prim_Op
:= Node
(Op_Elmt
);
1978 -- Search primitives that are implicit operations with an
1979 -- internal name whose parent operation has a normal name.
1981 if Present
(Alias
(Prim_Op
))
1982 and then Find_Dispatching_Type
(Alias
(Prim_Op
)) /= E
1983 and then not Comes_From_Source
(Prim_Op
)
1984 and then Is_Internal_Name
(Chars
(Prim_Op
))
1985 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1987 Parent_Subp
:= Alias
(Prim_Op
);
1989 -- Case 1: Check if the type has also an explicit
1990 -- overriding for this primitive.
1992 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1993 while Present
(Op_Elmt_2
) loop
1995 -- Skip entities with attribute Interface_Alias since
1996 -- they are not overriding primitives (these entities
1997 -- link an interface primitive with their covering
2000 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
2001 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
2002 and then No
(Interface_Alias
(Node
(Op_Elmt_2
)))
2004 -- The private inherited operation has been
2005 -- overridden by an explicit subprogram:
2006 -- replace the former by the latter.
2008 New_Op
:= Node
(Op_Elmt_2
);
2009 Replace_Elmt
(Op_Elmt
, New_Op
);
2010 Remove_Elmt
(Op_List
, Op_Elmt_2
);
2011 Set_Overridden_Operation
(New_Op
, Parent_Subp
);
2013 -- We don't need to inherit its dispatching slot.
2014 -- Set_All_DT_Position has previously ensured that
2015 -- the same slot was assigned to the two primitives
2018 and then Present
(DTC_Entity
(New_Op
))
2019 and then Present
(DTC_Entity
(Prim_Op
))
2022 (DT_Position
(New_Op
) = DT_Position
(Prim_Op
));
2026 goto Next_Primitive
;
2029 Next_Elmt
(Op_Elmt_2
);
2032 -- Case 2: We have not found any explicit overriding and
2033 -- hence we need to declare the operation (i.e., make it
2036 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
2038 -- Inherit the dispatching slot if E is already frozen
2041 and then Present
(DTC_Entity
(Alias
(Prim_Op
)))
2043 Set_DTC_Entity_Value
(E
, New_Op
);
2044 Set_DT_Position_Value
(New_Op
,
2045 DT_Position
(Alias
(Prim_Op
)));
2049 (Is_Dispatching_Operation
(New_Op
)
2050 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
2052 -- Substitute the new operation for the old one in the
2053 -- type's primitive operations list. Since the new
2054 -- operation was also just added to the end of list,
2055 -- the last element must be removed.
2057 -- (Question: is there a simpler way of declaring the
2058 -- operation, say by just replacing the name of the
2059 -- earlier operation, reentering it in the in the symbol
2060 -- table (how?), and marking it as private???)
2062 Replace_Elmt
(Op_Elmt
, New_Op
);
2063 Remove_Last_Elmt
(Op_List
);
2067 Next_Elmt
(Op_Elmt
);
2070 -- Generate listing showing the contents of the dispatch table
2072 if Debug_Flag_ZZ
then
2077 -- For untagged type, scan forward to locate inherited hidden
2080 Prim_Op
:= Next_Entity
(E
);
2081 while Present
(Prim_Op
) loop
2082 if Is_Subprogram
(Prim_Op
)
2083 and then Present
(Alias
(Prim_Op
))
2084 and then not Comes_From_Source
(Prim_Op
)
2085 and then Is_Internal_Name
(Chars
(Prim_Op
))
2086 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
2087 and then Is_Primitive_Of
(E
, Prim_Op
)
2089 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
2092 Next_Entity
(Prim_Op
);
2094 -- Derived operations appear immediately after the type
2095 -- declaration (or the following subtype indication for
2096 -- a derived scalar type). Further declarations cannot
2097 -- include inherited operations of the type.
2099 if Present
(Prim_Op
) then
2100 exit when Ekind
(Prim_Op
) not in Overloadable_Kind
;
2108 end Declare_Inherited_Private_Subprograms
;
2110 -----------------------
2111 -- End_Package_Scope --
2112 -----------------------
2114 procedure End_Package_Scope
(P
: Entity_Id
) is
2116 Uninstall_Declarations
(P
);
2118 end End_Package_Scope
;
2120 ---------------------------
2121 -- Exchange_Declarations --
2122 ---------------------------
2124 procedure Exchange_Declarations
(Id
: Entity_Id
) is
2125 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
2126 H1
: constant Entity_Id
:= Homonym
(Id
);
2127 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
2132 -- If missing full declaration for type, nothing to exchange
2134 if No
(Full_Id
) then
2138 -- Otherwise complete the exchange, and preserve semantic links
2140 Next2
:= Next_Entity
(Full_Id
);
2141 H2
:= Homonym
(Full_Id
);
2143 -- Reset full declaration pointer to reflect the switched entities and
2144 -- readjust the next entity chains.
2146 Exchange_Entities
(Id
, Full_Id
);
2148 Set_Next_Entity
(Id
, Next1
);
2149 Set_Homonym
(Id
, H1
);
2151 Set_Full_View
(Full_Id
, Id
);
2152 Set_Next_Entity
(Full_Id
, Next2
);
2153 Set_Homonym
(Full_Id
, H2
);
2154 end Exchange_Declarations
;
2156 ----------------------------
2157 -- Install_Package_Entity --
2158 ----------------------------
2160 procedure Install_Package_Entity
(Id
: Entity_Id
) is
2162 if not Is_Internal
(Id
) then
2163 if Debug_Flag_E
then
2164 Write_Str
("Install: ");
2165 Write_Name
(Chars
(Id
));
2169 if Is_Child_Unit
(Id
) then
2172 -- Do not enter implicitly inherited non-overridden subprograms of
2173 -- a tagged type back into visibility if they have non-conformant
2174 -- homographs (Ada RM 8.3 12.3/2).
2176 elsif Is_Hidden_Non_Overridden_Subpgm
(Id
) then
2180 Set_Is_Immediately_Visible
(Id
);
2183 end Install_Package_Entity
;
2185 ----------------------------------
2186 -- Install_Private_Declarations --
2187 ----------------------------------
2189 procedure Install_Private_Declarations
(P
: Entity_Id
) is
2192 Priv_Deps
: Elist_Id
;
2194 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
);
2195 -- When the full view of a private type is made available, we do the
2196 -- same for its private dependents under proper visibility conditions.
2197 -- When compiling a grand-chid unit this needs to be done recursively.
2199 -----------------------------
2200 -- Swap_Private_Dependents --
2201 -----------------------------
2203 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
) is
2206 Priv_Elmt
: Elmt_Id
;
2210 Priv_Elmt
:= First_Elmt
(Priv_Deps
);
2211 while Present
(Priv_Elmt
) loop
2212 Priv
:= Node
(Priv_Elmt
);
2214 -- Before the exchange, verify that the presence of the Full_View
2215 -- field. This field will be empty if the entity has already been
2216 -- installed due to a previous call.
2218 if Present
(Full_View
(Priv
)) and then Is_Visible_Dependent
(Priv
)
2220 if Is_Private_Type
(Priv
) then
2221 Deps
:= Private_Dependents
(Priv
);
2227 -- For each subtype that is swapped, we also swap the reference
2228 -- to it in Private_Dependents, to allow access to it when we
2229 -- swap them out in End_Package_Scope.
2231 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
2233 -- Ensure that both views of the dependent private subtype are
2234 -- immediately visible if within some open scope. Check full
2235 -- view before exchanging views.
2237 if In_Open_Scopes
(Scope
(Full_View
(Priv
))) then
2238 Set_Is_Immediately_Visible
(Priv
);
2241 Exchange_Declarations
(Priv
);
2242 Set_Is_Immediately_Visible
2243 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
2245 Set_Is_Potentially_Use_Visible
2246 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
2248 -- Within a child unit, recurse, except in generic child unit,
2249 -- which (unfortunately) handle private_dependents separately.
2252 and then Is_Child_Unit
(Cunit_Entity
(Current_Sem_Unit
))
2253 and then not Is_Empty_Elmt_List
(Deps
)
2254 and then not Inside_A_Generic
2256 Swap_Private_Dependents
(Deps
);
2260 Next_Elmt
(Priv_Elmt
);
2262 end Swap_Private_Dependents
;
2264 -- Start of processing for Install_Private_Declarations
2267 -- First exchange declarations for private types, so that the full
2268 -- declaration is visible. For each private type, we check its
2269 -- Private_Dependents list and also exchange any subtypes of or derived
2270 -- types from it. Finally, if this is a Taft amendment type, the
2271 -- incomplete declaration is irrelevant, and we want to link the
2272 -- eventual full declaration with the original private one so we
2273 -- also skip the exchange.
2275 Id
:= First_Entity
(P
);
2276 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2277 if Is_Private_Base_Type
(Id
)
2278 and then Present
(Full_View
(Id
))
2279 and then Comes_From_Source
(Full_View
(Id
))
2280 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
2281 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
2283 -- If there is a use-type clause on the private type, set the full
2284 -- view accordingly.
2286 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
2287 Full
:= Full_View
(Id
);
2289 if Is_Private_Base_Type
(Full
)
2290 and then Has_Private_Declaration
(Full
)
2291 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
2292 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
2293 and then In_Package_Body
(Current_Scope
)
2294 and then not Is_Private_Type
(Etype
(Full
))
2296 -- This is the completion of a private type by a derivation
2297 -- from another private type which is not private anymore. This
2298 -- can only happen in a package nested within a child package,
2299 -- when the parent type is defined in the parent unit. At this
2300 -- point the current type is not private either, and we have
2301 -- to install the underlying full view, which is now visible.
2302 -- Save the current full view as well, so that all views can be
2303 -- restored on exit. It may seem that after compiling the child
2304 -- body there are not environments to restore, but the back-end
2305 -- expects those links to be valid, and freeze nodes depend on
2308 if No
(Full_View
(Full
))
2309 and then Present
(Underlying_Full_View
(Full
))
2311 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
2312 Set_Underlying_Full_View
(Id
, Full
);
2313 Set_Is_Underlying_Full_View
(Full
);
2315 Set_Underlying_Full_View
(Full
, Empty
);
2316 Set_Is_Frozen
(Full_View
(Id
));
2320 Priv_Deps
:= Private_Dependents
(Id
);
2321 Exchange_Declarations
(Id
);
2322 Set_Is_Immediately_Visible
(Id
);
2323 Swap_Private_Dependents
(Priv_Deps
);
2329 -- Next make other declarations in the private part visible as well
2331 Id
:= First_Private_Entity
(P
);
2332 while Present
(Id
) loop
2333 Install_Package_Entity
(Id
);
2334 Set_Is_Hidden
(Id
, False);
2338 -- An abstract state is partially refined when it has at least one
2339 -- Part_Of constituent. Since these constituents are being installed
2340 -- into visibility, update the partial refinement status of any state
2341 -- defined in the associated package, subject to at least one Part_Of
2344 if Ekind_In
(P
, E_Generic_Package
, E_Package
) then
2346 States
: constant Elist_Id
:= Abstract_States
(P
);
2347 State_Elmt
: Elmt_Id
;
2348 State_Id
: Entity_Id
;
2351 if Present
(States
) then
2352 State_Elmt
:= First_Elmt
(States
);
2353 while Present
(State_Elmt
) loop
2354 State_Id
:= Node
(State_Elmt
);
2356 if Present
(Part_Of_Constituents
(State_Id
)) then
2357 Set_Has_Partial_Visible_Refinement
(State_Id
);
2360 Next_Elmt
(State_Elmt
);
2366 -- Indicate that the private part is currently visible, so it can be
2367 -- properly reset on exit.
2369 Set_In_Private_Part
(P
);
2370 end Install_Private_Declarations
;
2372 ----------------------------------
2373 -- Install_Visible_Declarations --
2374 ----------------------------------
2376 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
2378 Last_Entity
: Entity_Id
;
2382 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
2384 if Is_Package_Or_Generic_Package
(P
) then
2385 Last_Entity
:= First_Private_Entity
(P
);
2387 Last_Entity
:= Empty
;
2390 Id
:= First_Entity
(P
);
2391 while Present
(Id
) and then Id
/= Last_Entity
loop
2392 Install_Package_Entity
(Id
);
2395 end Install_Visible_Declarations
;
2397 --------------------------
2398 -- Is_Private_Base_Type --
2399 --------------------------
2401 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
2403 return Ekind
(E
) = E_Private_Type
2404 or else Ekind
(E
) = E_Limited_Private_Type
2405 or else Ekind
(E
) = E_Record_Type_With_Private
;
2406 end Is_Private_Base_Type
;
2408 --------------------------
2409 -- Is_Visible_Dependent --
2410 --------------------------
2412 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
2414 S
: constant Entity_Id
:= Scope
(Dep
);
2417 -- Renamings created for actual types have the visibility of the actual
2419 if Ekind
(S
) = E_Package
2420 and then Is_Generic_Instance
(S
)
2421 and then (Is_Generic_Actual_Type
(Dep
)
2422 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
2426 elsif not (Is_Derived_Type
(Dep
))
2427 and then Is_Derived_Type
(Full_View
(Dep
))
2429 -- When instantiating a package body, the scope stack is empty, so
2430 -- check instead whether the dependent type is defined in the same
2431 -- scope as the instance itself.
2433 return In_Open_Scopes
(S
)
2434 or else (Is_Generic_Instance
(Current_Scope
)
2435 and then Scope
(Dep
) = Scope
(Current_Scope
));
2439 end Is_Visible_Dependent
;
2441 ----------------------------
2442 -- May_Need_Implicit_Body --
2443 ----------------------------
2445 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
2446 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
2447 S
: constant Node_Id
:= Parent
(P
);
2452 if not Has_Completion
(E
)
2453 and then Nkind
(P
) = N_Package_Declaration
2454 and then (Present
(Activation_Chain_Entity
(P
)) or else Has_RACW
(E
))
2457 Make_Package_Body
(Sloc
(E
),
2458 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
2459 Chars
=> Chars
(E
)),
2460 Declarations
=> New_List
);
2462 if Nkind
(S
) = N_Package_Specification
then
2463 if Present
(Private_Declarations
(S
)) then
2464 Decls
:= Private_Declarations
(S
);
2466 Decls
:= Visible_Declarations
(S
);
2469 Decls
:= Declarations
(S
);
2475 end May_Need_Implicit_Body
;
2477 ----------------------
2478 -- New_Private_Type --
2479 ----------------------
2481 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
2483 -- For other than Ada 2012, enter the name in the current scope
2485 if Ada_Version
< Ada_2012
then
2488 -- Ada 2012 (AI05-0162): Enter the name in the current scope. Note that
2489 -- there may be an incomplete previous view.
2495 Prev
:= Find_Type_Name
(N
);
2496 pragma Assert
(Prev
= Id
2497 or else (Ekind
(Prev
) = E_Incomplete_Type
2498 and then Present
(Full_View
(Prev
))
2499 and then Full_View
(Prev
) = Id
));
2503 if Limited_Present
(Def
) then
2504 Set_Ekind
(Id
, E_Limited_Private_Type
);
2506 Set_Ekind
(Id
, E_Private_Type
);
2510 Set_Has_Delayed_Freeze
(Id
);
2511 Set_Is_First_Subtype
(Id
);
2512 Init_Size_Align
(Id
);
2514 Set_Is_Constrained
(Id
,
2515 No
(Discriminant_Specifications
(N
))
2516 and then not Unknown_Discriminants_Present
(N
));
2518 -- Set tagged flag before processing discriminants, to catch illegal
2521 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
2523 Set_Discriminant_Constraint
(Id
, No_Elist
);
2524 Set_Stored_Constraint
(Id
, No_Elist
);
2526 if Present
(Discriminant_Specifications
(N
)) then
2528 Process_Discriminants
(N
);
2531 elsif Unknown_Discriminants_Present
(N
) then
2532 Set_Has_Unknown_Discriminants
(Id
);
2535 Set_Private_Dependents
(Id
, New_Elmt_List
);
2537 if Tagged_Present
(Def
) then
2538 Set_Ekind
(Id
, E_Record_Type_With_Private
);
2539 Set_Direct_Primitive_Operations
(Id
, New_Elmt_List
);
2540 Set_Is_Abstract_Type
(Id
, Abstract_Present
(Def
));
2541 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
2542 Set_Has_Delayed_Freeze
(Id
, True);
2544 -- Recognize Ada.Real_Time.Timing_Events.Timing_Events here
2546 if Is_RTE
(Id
, RE_Timing_Event
) then
2547 Set_Has_Timing_Event
(Id
);
2550 -- Create a class-wide type with the same attributes
2552 Make_Class_Wide_Type
(Id
);
2554 elsif Abstract_Present
(Def
) then
2555 Error_Msg_N
("only a tagged type can be abstract", N
);
2557 end New_Private_Type
;
2559 ---------------------------------
2560 -- Requires_Completion_In_Body --
2561 ---------------------------------
2563 function Requires_Completion_In_Body
2565 Pack_Id
: Entity_Id
;
2566 Do_Abstract_States
: Boolean := False) return Boolean
2569 -- Always ignore child units. Child units get added to the entity list
2570 -- of a parent unit, but are not original entities of the parent, and
2571 -- so do not affect whether the parent needs a body.
2573 if Is_Child_Unit
(Id
) then
2576 -- Ignore formal packages and their renamings
2578 elsif Ekind
(Id
) = E_Package
2579 and then Nkind
(Original_Node
(Unit_Declaration_Node
(Id
))) =
2580 N_Formal_Package_Declaration
2584 -- Otherwise test to see if entity requires a completion. Note that
2585 -- subprogram entities whose declaration does not come from source are
2586 -- ignored here on the basis that we assume the expander will provide an
2587 -- implicit completion at some point.
2589 elsif (Is_Overloadable
(Id
)
2590 and then not Ekind_In
(Id
, E_Enumeration_Literal
, E_Operator
)
2591 and then not Is_Abstract_Subprogram
(Id
)
2592 and then not Has_Completion
(Id
)
2593 and then Comes_From_Source
(Parent
(Id
)))
2596 (Ekind
(Id
) = E_Package
2597 and then Id
/= Pack_Id
2598 and then not Has_Completion
(Id
)
2599 and then Unit_Requires_Body
(Id
, Do_Abstract_States
))
2602 (Ekind
(Id
) = E_Incomplete_Type
2603 and then No
(Full_View
(Id
))
2604 and then not Is_Generic_Type
(Id
))
2607 (Ekind_In
(Id
, E_Task_Type
, E_Protected_Type
)
2608 and then not Has_Completion
(Id
))
2611 (Ekind
(Id
) = E_Generic_Package
2612 and then Id
/= Pack_Id
2613 and then not Has_Completion
(Id
)
2614 and then Unit_Requires_Body
(Id
, Do_Abstract_States
))
2617 (Is_Generic_Subprogram
(Id
)
2618 and then not Has_Completion
(Id
))
2622 -- Otherwise the entity does not require completion in a package body
2627 end Requires_Completion_In_Body
;
2629 ----------------------------
2630 -- Uninstall_Declarations --
2631 ----------------------------
2633 procedure Uninstall_Declarations
(P
: Entity_Id
) is
2634 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
2637 Priv_Elmt
: Elmt_Id
;
2638 Priv_Sub
: Entity_Id
;
2640 procedure Preserve_Full_Attributes
(Priv
: Entity_Id
; Full
: Entity_Id
);
2641 -- Copy to the private declaration the attributes of the full view that
2642 -- need to be available for the partial view also.
2644 function Type_In_Use
(T
: Entity_Id
) return Boolean;
2645 -- Check whether type or base type appear in an active use_type clause
2647 ------------------------------
2648 -- Preserve_Full_Attributes --
2649 ------------------------------
2651 procedure Preserve_Full_Attributes
2655 Full_Base
: constant Entity_Id
:= Base_Type
(Full
);
2656 Priv_Is_Base_Type
: constant Boolean := Is_Base_Type
(Priv
);
2659 Set_Size_Info
(Priv
, Full
);
2660 Set_RM_Size
(Priv
, RM_Size
(Full
));
2661 Set_Size_Known_At_Compile_Time
2662 (Priv
, Size_Known_At_Compile_Time
(Full
));
2663 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
2664 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
2665 Set_Is_Ada_2005_Only
(Priv
, Is_Ada_2005_Only
(Full
));
2666 Set_Is_Ada_2012_Only
(Priv
, Is_Ada_2012_Only
(Full
));
2667 Set_Has_Pragma_Unmodified
(Priv
, Has_Pragma_Unmodified
(Full
));
2668 Set_Has_Pragma_Unreferenced
(Priv
, Has_Pragma_Unreferenced
(Full
));
2669 Set_Has_Pragma_Unreferenced_Objects
2670 (Priv
, Has_Pragma_Unreferenced_Objects
2672 if Is_Unchecked_Union
(Full
) then
2673 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
2675 -- Why is atomic not copied here ???
2677 if Referenced
(Full
) then
2678 Set_Referenced
(Priv
);
2681 if Priv_Is_Base_Type
then
2682 Set_Is_Controlled_Active
2683 (Priv
, Is_Controlled_Active
(Full_Base
));
2684 Set_Finalize_Storage_Only
2685 (Priv
, Finalize_Storage_Only
(Full_Base
));
2686 Set_Has_Controlled_Component
2687 (Priv
, Has_Controlled_Component
(Full_Base
));
2689 Propagate_Concurrent_Flags
(Priv
, Base_Type
(Full
));
2692 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
2694 -- Propagate Default_Initial_Condition-related attributes from the
2695 -- base type of the full view to the full view and vice versa. This
2696 -- may seem strange, but is necessary depending on which type
2697 -- triggered the generation of the DIC procedure body. As a result,
2698 -- both the full view and its base type carry the same DIC-related
2701 Propagate_DIC_Attributes
(Full
, From_Typ
=> Full_Base
);
2702 Propagate_DIC_Attributes
(Full_Base
, From_Typ
=> Full
);
2704 -- Propagate Default_Initial_Condition-related attributes from the
2705 -- full view to the private view.
2707 Propagate_DIC_Attributes
(Priv
, From_Typ
=> Full
);
2709 -- Propagate invariant-related attributes from the base type of the
2710 -- full view to the full view and vice versa. This may seem strange,
2711 -- but is necessary depending on which type triggered the generation
2712 -- of the invariant procedure body. As a result, both the full view
2713 -- and its base type carry the same invariant-related information.
2715 Propagate_Invariant_Attributes
(Full
, From_Typ
=> Full_Base
);
2716 Propagate_Invariant_Attributes
(Full_Base
, From_Typ
=> Full
);
2718 -- Propagate invariant-related attributes from the full view to the
2721 Propagate_Invariant_Attributes
(Priv
, From_Typ
=> Full
);
2723 if Is_Tagged_Type
(Priv
)
2724 and then Is_Tagged_Type
(Full
)
2725 and then not Error_Posted
(Full
)
2727 if Is_Tagged_Type
(Priv
) then
2729 -- If the type is tagged, the tag itself must be available on
2730 -- the partial view, for expansion purposes.
2732 Set_First_Entity
(Priv
, First_Entity
(Full
));
2734 -- If there are discriminants in the partial view, these remain
2735 -- visible. Otherwise only the tag itself is visible, and there
2736 -- are no nameable components in the partial view.
2738 if No
(Last_Entity
(Priv
)) then
2739 Set_Last_Entity
(Priv
, First_Entity
(Priv
));
2743 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
2745 if Has_Discriminants
(Full
) then
2746 Set_Discriminant_Constraint
(Priv
,
2747 Discriminant_Constraint
(Full
));
2750 end Preserve_Full_Attributes
;
2756 function Type_In_Use
(T
: Entity_Id
) return Boolean is
2758 return Scope
(Base_Type
(T
)) = P
2759 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
2762 -- Start of processing for Uninstall_Declarations
2765 Id
:= First_Entity
(P
);
2766 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2767 if Debug_Flag_E
then
2768 Write_Str
("unlinking visible entity ");
2769 Write_Int
(Int
(Id
));
2773 -- On exit from the package scope, we must preserve the visibility
2774 -- established by use clauses in the current scope. Two cases:
2776 -- a) If the entity is an operator, it may be a primitive operator of
2777 -- a type for which there is a visible use-type clause.
2779 -- b) for other entities, their use-visibility is determined by a
2780 -- visible use clause for the package itself. For a generic instance,
2781 -- the instantiation of the formals appears in the visible part,
2782 -- but the formals are private and remain so.
2784 if Ekind
(Id
) = E_Function
2785 and then Is_Operator_Symbol_Name
(Chars
(Id
))
2786 and then not Is_Hidden
(Id
)
2787 and then not Error_Posted
(Id
)
2789 Set_Is_Potentially_Use_Visible
(Id
,
2791 or else Type_In_Use
(Etype
(Id
))
2792 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
2793 or else (Present
(Next_Formal
(First_Formal
(Id
)))
2796 (Etype
(Next_Formal
(First_Formal
(Id
))))));
2798 if In_Use
(P
) and then not Is_Hidden
(Id
) then
2800 -- A child unit of a use-visible package remains use-visible
2801 -- only if it is itself a visible child unit. Otherwise it
2802 -- would remain visible in other contexts where P is use-
2803 -- visible, because once compiled it stays in the entity list
2804 -- of its parent unit.
2806 if Is_Child_Unit
(Id
) then
2807 Set_Is_Potentially_Use_Visible
2808 (Id
, Is_Visible_Lib_Unit
(Id
));
2810 Set_Is_Potentially_Use_Visible
(Id
);
2814 Set_Is_Potentially_Use_Visible
(Id
, False);
2818 -- Local entities are not immediately visible outside of the package
2820 Set_Is_Immediately_Visible
(Id
, False);
2822 -- If this is a private type with a full view (for example a local
2823 -- subtype of a private type declared elsewhere), ensure that the
2824 -- full view is also removed from visibility: it may be exposed when
2825 -- swapping views in an instantiation. Similarly, ensure that the
2826 -- use-visibility is properly set on both views.
2828 if Is_Type
(Id
) and then Present
(Full_View
(Id
)) then
2829 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
2830 Set_Is_Potentially_Use_Visible
(Full_View
(Id
),
2831 Is_Potentially_Use_Visible
(Id
));
2834 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2835 Check_Abstract_Overriding
(Id
);
2836 Check_Conventions
(Id
);
2839 if Ekind_In
(Id
, E_Private_Type
, E_Limited_Private_Type
)
2840 and then No
(Full_View
(Id
))
2841 and then not Is_Generic_Type
(Id
)
2842 and then not Is_Derived_Type
(Id
)
2844 Error_Msg_N
("missing full declaration for private type&", Id
);
2846 elsif Ekind
(Id
) = E_Record_Type_With_Private
2847 and then not Is_Generic_Type
(Id
)
2848 and then No
(Full_View
(Id
))
2850 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
2851 Error_Msg_N
("missing full declaration for private type&", Id
);
2854 ("missing full declaration for private extension", Id
);
2857 -- Case of constant, check for deferred constant declaration with
2858 -- no full view. Likely just a matter of a missing expression, or
2859 -- accidental use of the keyword constant.
2861 elsif Ekind
(Id
) = E_Constant
2863 -- OK if constant value present
2865 and then No
(Constant_Value
(Id
))
2867 -- OK if full view present
2869 and then No
(Full_View
(Id
))
2871 -- OK if imported, since that provides the completion
2873 and then not Is_Imported
(Id
)
2875 -- OK if object declaration replaced by renaming declaration as
2876 -- a result of OK_To_Rename processing (e.g. for concatenation)
2878 and then Nkind
(Parent
(Id
)) /= N_Object_Renaming_Declaration
2880 -- OK if object declaration with the No_Initialization flag set
2882 and then not (Nkind
(Parent
(Id
)) = N_Object_Declaration
2883 and then No_Initialization
(Parent
(Id
)))
2885 -- If no private declaration is present, we assume the user did
2886 -- not intend a deferred constant declaration and the problem
2887 -- is simply that the initializing expression is missing.
2889 if not Has_Private_Declaration
(Etype
(Id
)) then
2891 -- We assume that the user did not intend a deferred constant
2892 -- declaration, and the expression is just missing.
2895 ("constant declaration requires initialization expression",
2898 if Is_Limited_Type
(Etype
(Id
)) then
2900 ("\if variable intended, remove CONSTANT from declaration",
2904 -- Otherwise if a private declaration is present, then we are
2905 -- missing the full declaration for the deferred constant.
2909 ("missing full declaration for deferred constant (RM 7.4)",
2912 if Is_Limited_Type
(Etype
(Id
)) then
2914 ("\if variable intended, remove CONSTANT from declaration",
2923 -- If the specification was installed as the parent of a public child
2924 -- unit, the private declarations were not installed, and there is
2927 if not In_Private_Part
(P
) then
2930 Set_In_Private_Part
(P
, False);
2933 -- Make private entities invisible and exchange full and private
2934 -- declarations for private types. Id is now the first private entity
2937 while Present
(Id
) loop
2938 if Debug_Flag_E
then
2939 Write_Str
("unlinking private entity ");
2940 Write_Int
(Int
(Id
));
2944 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2945 Check_Abstract_Overriding
(Id
);
2946 Check_Conventions
(Id
);
2949 Set_Is_Immediately_Visible
(Id
, False);
2951 if Is_Private_Base_Type
(Id
) and then Present
(Full_View
(Id
)) then
2952 Full
:= Full_View
(Id
);
2954 -- If the partial view is not declared in the visible part of the
2955 -- package (as is the case when it is a type derived from some
2956 -- other private type in the private part of the current package),
2957 -- no exchange takes place.
2960 or else List_Containing
(Parent
(Id
)) /=
2961 Visible_Declarations
(Specification
(Decl
))
2966 -- The entry in the private part points to the full declaration,
2967 -- which is currently visible. Exchange them so only the private
2968 -- type declaration remains accessible, and link private and full
2969 -- declaration in the opposite direction. Before the actual
2970 -- exchange, we copy back attributes of the full view that must
2971 -- be available to the partial view too.
2973 Preserve_Full_Attributes
(Id
, Full
);
2975 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
2977 -- The following test may be redundant, as this is already
2978 -- diagnosed in sem_ch3. ???
2980 if not Is_Definite_Subtype
(Full
)
2981 and then Is_Definite_Subtype
(Id
)
2983 Error_Msg_Sloc
:= Sloc
(Parent
(Id
));
2985 ("full view of& not compatible with declaration#", Full
, Id
);
2988 -- Swap out the subtypes and derived types of Id that
2989 -- were compiled in this scope, or installed previously
2990 -- by Install_Private_Declarations.
2992 -- Before we do the swap, we verify the presence of the Full_View
2993 -- field which may be empty due to a swap by a previous call to
2994 -- End_Package_Scope (e.g. from the freezing mechanism).
2996 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2997 while Present
(Priv_Elmt
) loop
2998 Priv_Sub
:= Node
(Priv_Elmt
);
3000 if Present
(Full_View
(Priv_Sub
)) then
3001 if Scope
(Priv_Sub
) = P
3002 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
3004 Set_Is_Immediately_Visible
(Priv_Sub
, False);
3007 if Is_Visible_Dependent
(Priv_Sub
) then
3008 Preserve_Full_Attributes
3009 (Priv_Sub
, Full_View
(Priv_Sub
));
3010 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
3011 Exchange_Declarations
(Priv_Sub
);
3015 Next_Elmt
(Priv_Elmt
);
3018 -- Now restore the type itself to its private view
3020 Exchange_Declarations
(Id
);
3022 -- If we have installed an underlying full view for a type derived
3023 -- from a private type in a child unit, restore the proper views
3024 -- of private and full view. See corresponding code in
3025 -- Install_Private_Declarations.
3027 -- After the exchange, Full denotes the private type in the
3028 -- visible part of the package.
3030 if Is_Private_Base_Type
(Full
)
3031 and then Present
(Full_View
(Full
))
3032 and then Present
(Underlying_Full_View
(Full
))
3033 and then In_Package_Body
(Current_Scope
)
3035 Set_Full_View
(Full
, Underlying_Full_View
(Full
));
3036 Set_Underlying_Full_View
(Full
, Empty
);
3039 elsif Ekind
(Id
) = E_Incomplete_Type
3040 and then Comes_From_Source
(Id
)
3041 and then No
(Full_View
(Id
))
3043 -- Mark Taft amendment types. Verify that there are no primitive
3044 -- operations declared for the type (3.10.1(9)).
3046 Set_Has_Completion_In_Body
(Id
);
3053 Elmt
:= First_Elmt
(Private_Dependents
(Id
));
3054 while Present
(Elmt
) loop
3055 Subp
:= Node
(Elmt
);
3057 -- Is_Primitive is tested because there can be cases where
3058 -- nonprimitive subprograms (in nested packages) are added
3059 -- to the Private_Dependents list.
3061 if Is_Overloadable
(Subp
) and then Is_Primitive
(Subp
) then
3063 ("type& must be completed in the private part",
3066 -- The result type of an access-to-function type cannot be a
3067 -- Taft-amendment type, unless the version is Ada 2012 or
3068 -- later (see AI05-151).
3070 elsif Ada_Version
< Ada_2012
3071 and then Ekind
(Subp
) = E_Subprogram_Type
3073 if Etype
(Subp
) = Id
3075 (Is_Class_Wide_Type
(Etype
(Subp
))
3076 and then Etype
(Etype
(Subp
)) = Id
)
3079 ("type& must be completed in the private part",
3080 Associated_Node_For_Itype
(Subp
), Id
);
3088 elsif not Is_Child_Unit
(Id
)
3089 and then (not Is_Private_Type
(Id
) or else No
(Full_View
(Id
)))
3092 Set_Is_Potentially_Use_Visible
(Id
, False);
3098 end Uninstall_Declarations
;
3100 ------------------------
3101 -- Unit_Requires_Body --
3102 ------------------------
3104 function Unit_Requires_Body
3105 (Pack_Id
: Entity_Id
;
3106 Do_Abstract_States
: Boolean := False) return Boolean
3110 Requires_Body
: Boolean := False;
3111 -- Flag set when the unit has at least one construct that requries
3112 -- completion in a body.
3115 -- Imported entity never requires body. Right now, only subprograms can
3116 -- be imported, but perhaps in the future we will allow import of
3119 if Is_Imported
(Pack_Id
) then
3122 -- Body required if library package with pragma Elaborate_Body
3124 elsif Has_Pragma_Elaborate_Body
(Pack_Id
) then
3127 -- Body required if subprogram
3129 elsif Is_Subprogram_Or_Generic_Subprogram
(Pack_Id
) then
3132 -- Treat a block as requiring a body
3134 elsif Ekind
(Pack_Id
) = E_Block
then
3137 elsif Ekind
(Pack_Id
) = E_Package
3138 and then Nkind
(Parent
(Pack_Id
)) = N_Package_Specification
3139 and then Present
(Generic_Parent
(Parent
(Pack_Id
)))
3142 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(Pack_Id
));
3144 if Has_Pragma_Elaborate_Body
(G_P
) then
3150 -- Traverse the entity chain of the package and look for constructs that
3151 -- require a completion in a body.
3153 E
:= First_Entity
(Pack_Id
);
3154 while Present
(E
) loop
3156 -- Skip abstract states because their completion depends on several
3157 -- criteria (see below).
3159 if Ekind
(E
) = E_Abstract_State
then
3162 elsif Requires_Completion_In_Body
3163 (E
, Pack_Id
, Do_Abstract_States
)
3165 Requires_Body
:= True;
3172 -- A [generic] package that defines at least one non-null abstract state
3173 -- requires a completion only when at least one other construct requires
3174 -- a completion in a body (SPARK RM 7.1.4(4) and (6)). This check is not
3175 -- performed if the caller requests this behavior.
3177 if Do_Abstract_States
3178 and then Ekind_In
(Pack_Id
, E_Generic_Package
, E_Package
)
3179 and then Has_Non_Null_Abstract_State
(Pack_Id
)
3180 and then Requires_Body
3185 return Requires_Body
;
3186 end Unit_Requires_Body
;
3188 -----------------------------
3189 -- Unit_Requires_Body_Info --
3190 -----------------------------
3192 procedure Unit_Requires_Body_Info
(Pack_Id
: Entity_Id
) is
3196 -- An imported entity never requires body. Right now, only subprograms
3197 -- can be imported, but perhaps in the future we will allow import of
3200 if Is_Imported
(Pack_Id
) then
3203 -- Body required if library package with pragma Elaborate_Body
3205 elsif Has_Pragma_Elaborate_Body
(Pack_Id
) then
3206 Error_Msg_N
("info: & requires body (Elaborate_Body)?Y?", Pack_Id
);
3208 -- Body required if subprogram
3210 elsif Is_Subprogram_Or_Generic_Subprogram
(Pack_Id
) then
3211 Error_Msg_N
("info: & requires body (subprogram case)?Y?", Pack_Id
);
3213 -- Body required if generic parent has Elaborate_Body
3215 elsif Ekind
(Pack_Id
) = E_Package
3216 and then Nkind
(Parent
(Pack_Id
)) = N_Package_Specification
3217 and then Present
(Generic_Parent
(Parent
(Pack_Id
)))
3220 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(Pack_Id
));
3222 if Has_Pragma_Elaborate_Body
(G_P
) then
3224 ("info: & requires body (generic parent Elaborate_Body)?Y?",
3229 -- A [generic] package that introduces at least one non-null abstract
3230 -- state requires completion. However, there is a separate rule that
3231 -- requires that such a package have a reason other than this for a
3232 -- body being required (if necessary a pragma Elaborate_Body must be
3233 -- provided). If Ignore_Abstract_State is True, we don't do this check
3234 -- (so we can use Unit_Requires_Body to check for some other reason).
3236 elsif Ekind_In
(Pack_Id
, E_Generic_Package
, E_Package
)
3237 and then Present
(Abstract_States
(Pack_Id
))
3238 and then not Is_Null_State
3239 (Node
(First_Elmt
(Abstract_States
(Pack_Id
))))
3242 ("info: & requires body (non-null abstract state aspect)?Y?",
3246 -- Otherwise search entity chain for entity requiring completion
3248 E
:= First_Entity
(Pack_Id
);
3249 while Present
(E
) loop
3250 if Requires_Completion_In_Body
(E
, Pack_Id
) then
3251 Error_Msg_Node_2
:= E
;
3253 ("info: & requires body (& requires completion)?Y?", E
, Pack_Id
);
3258 end Unit_Requires_Body_Info
;