1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2015, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 -- 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 Ghost
; use Ghost
;
43 with Lib
.Xref
; use Lib
.Xref
;
44 with Namet
; use Namet
;
45 with Nmake
; use Nmake
;
46 with Nlists
; use Nlists
;
48 with Output
; use Output
;
49 with Restrict
; use Restrict
;
51 with Sem_Aux
; use Sem_Aux
;
52 with Sem_Cat
; use Sem_Cat
;
53 with Sem_Ch3
; use Sem_Ch3
;
54 with Sem_Ch6
; use Sem_Ch6
;
55 with Sem_Ch8
; use Sem_Ch8
;
56 with Sem_Ch10
; use Sem_Ch10
;
57 with Sem_Ch12
; use Sem_Ch12
;
58 with Sem_Ch13
; use Sem_Ch13
;
59 with Sem_Disp
; use Sem_Disp
;
60 with Sem_Eval
; use Sem_Eval
;
61 with Sem_Prag
; use Sem_Prag
;
62 with Sem_Util
; use Sem_Util
;
63 with Sem_Warn
; use Sem_Warn
;
64 with Snames
; use Snames
;
65 with Stand
; use Stand
;
66 with Sinfo
; use Sinfo
;
67 with Sinput
; use Sinput
;
69 with Uintp
; use Uintp
;
71 package body Sem_Ch7
is
73 -----------------------------------
74 -- Handling private declarations --
75 -----------------------------------
77 -- The principle that each entity has a single defining occurrence clashes
78 -- with the presence of two separate definitions for private types: the
79 -- first is the private type declaration, and the second is the full type
80 -- declaration. It is important that all references to the type point to
81 -- the same defining occurrence, namely the first one. To enforce the two
82 -- separate views of the entity, the corresponding information is swapped
83 -- between the two declarations. Outside of the package, the defining
84 -- occurrence only contains the private declaration information, while in
85 -- the private part and the body of the package the defining occurrence
86 -- contains the full declaration. To simplify the swap, the defining
87 -- occurrence that currently holds the private declaration points to the
88 -- full declaration. During semantic processing the defining occurrence
89 -- also points to a list of private dependents, that is to say access types
90 -- or composite types whose designated types or component types are
91 -- subtypes or derived types of the private type in question. After the
92 -- full declaration has been seen, the private dependents are updated to
93 -- indicate that they have full definitions.
95 -----------------------
96 -- Local Subprograms --
97 -----------------------
99 procedure Analyze_Package_Body_Helper
(N
: Node_Id
);
100 -- Does all the real work of Analyze_Package_Body
102 procedure Check_Anonymous_Access_Types
103 (Spec_Id
: Entity_Id
;
105 -- If the spec of a package has a limited_with_clause, it may declare
106 -- anonymous access types whose designated type is a limited view, such an
107 -- anonymous access return type for a function. This access type cannot be
108 -- elaborated in the spec itself, but it may need an itype reference if it
109 -- is used within a nested scope. In that case the itype reference is
110 -- created at the beginning of the corresponding package body and inserted
111 -- before other body declarations.
113 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
114 -- Called upon entering the private part of a public child package and the
115 -- body of a nested package, to potentially declare certain inherited
116 -- subprograms that were inherited by types in the visible part, but whose
117 -- declaration was deferred because the parent operation was private and
118 -- not visible at that point. These subprograms are located by traversing
119 -- the visible part declarations looking for non-private type extensions
120 -- and then examining each of the primitive operations of such types to
121 -- find those that were inherited but declared with a special internal
122 -- name. Each such operation is now declared as an operation with a normal
123 -- name (using the name of the parent operation) and replaces the previous
124 -- implicit operation in the primitive operations list of the type. If the
125 -- inherited private operation has been overridden, then it's replaced by
126 -- the overriding operation.
128 procedure Install_Package_Entity
(Id
: Entity_Id
);
129 -- Supporting procedure for Install_{Visible,Private}_Declarations. Places
130 -- one entity on its visibility chain, and recurses on the visible part if
131 -- the entity is an inner package.
133 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
134 -- True for a private type that is not a subtype
136 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
137 -- If the private dependent is a private type whose full view is derived
138 -- from the parent type, its full properties are revealed only if we are in
139 -- the immediate scope of the private dependent. Should this predicate be
140 -- tightened further???
142 function Requires_Completion_In_Body
144 Pack_Id
: Entity_Id
) return Boolean;
145 -- Subsidiary to routines Unit_Requires_Body and Unit_Requires_Body_Info.
146 -- Determine whether entity Id declared in package spec Pack_Id requires
147 -- completion in a package body.
149 procedure Unit_Requires_Body_Info
(Pack_Id
: Entity_Id
);
150 -- Outputs info messages showing why package Pack_Id requires a body. The
151 -- caller has checked that the switch requesting this information is set,
152 -- and that the package does indeed require a body.
154 --------------------------
155 -- Analyze_Package_Body --
156 --------------------------
158 procedure Analyze_Package_Body
(N
: Node_Id
) is
159 Loc
: constant Source_Ptr
:= Sloc
(N
);
163 Write_Str
("==> package body ");
164 Write_Name
(Chars
(Defining_Entity
(N
)));
165 Write_Str
(" from ");
166 Write_Location
(Loc
);
171 -- The real work is split out into the helper, so it can do "return;"
172 -- without skipping the debug output.
174 Analyze_Package_Body_Helper
(N
);
178 Write_Str
("<== package body ");
179 Write_Name
(Chars
(Defining_Entity
(N
)));
180 Write_Str
(" from ");
181 Write_Location
(Loc
);
184 end Analyze_Package_Body
;
186 ---------------------------------
187 -- Analyze_Package_Body_Helper --
188 ---------------------------------
190 procedure Analyze_Package_Body_Helper
(N
: Node_Id
) is
191 procedure Hide_Public_Entities
(Decls
: List_Id
);
192 -- Attempt to hide all public entities found in declarative list Decls
193 -- by resetting their Is_Public flag to False depending on whether the
194 -- entities are not referenced by inlined or generic bodies. This kind
195 -- of processing is a conservative approximation and may still leave
196 -- certain entities externally visible.
198 procedure Install_Composite_Operations
(P
: Entity_Id
);
199 -- Composite types declared in the current scope may depend on types
200 -- that were private at the point of declaration, and whose full view
201 -- is now in scope. Indicate that the corresponding operations on the
202 -- composite type are available.
204 --------------------------
205 -- Hide_Public_Entities --
206 --------------------------
208 procedure Hide_Public_Entities
(Decls
: List_Id
) is
209 function Contains_Subp_Or_Const_Refs
(N
: Node_Id
) return Boolean;
210 -- Subsidiary to routine Has_Referencer. Determine whether a node
211 -- contains a reference to a subprogram or a non-static constant.
212 -- WARNING: this is a very expensive routine as it performs a full
215 function Has_Referencer
217 Top_Level
: Boolean := False) return Boolean;
218 -- A "referencer" is a construct which may reference a previous
219 -- declaration. Examine all declarations in list Decls in reverse
220 -- and determine whether once such referencer exists. All entities
221 -- in the range Last (Decls) .. Referencer are hidden from external
224 ---------------------------------
225 -- Contains_Subp_Or_Const_Refs --
226 ---------------------------------
228 function Contains_Subp_Or_Const_Refs
(N
: Node_Id
) return Boolean is
229 Reference_Seen
: Boolean := False;
231 function Is_Subp_Or_Const_Ref
232 (N
: Node_Id
) return Traverse_Result
;
233 -- Determine whether a node denotes a reference to a subprogram or
234 -- a non-static constant.
236 --------------------------
237 -- Is_Subp_Or_Const_Ref --
238 --------------------------
240 function Is_Subp_Or_Const_Ref
241 (N
: Node_Id
) return Traverse_Result
246 -- Detect a reference of the form
249 if Nkind
(N
) in N_Subprogram_Call
250 and then Is_Entity_Name
(Name
(N
))
252 Reference_Seen
:= True;
255 -- Detect a reference of the form
256 -- Subp'Some_Attribute
258 elsif Nkind
(N
) = N_Attribute_Reference
259 and then Is_Entity_Name
(Prefix
(N
))
260 and then Present
(Entity
(Prefix
(N
)))
261 and then Is_Subprogram
(Entity
(Prefix
(N
)))
263 Reference_Seen
:= True;
266 -- Detect the use of a non-static constant
268 elsif Is_Entity_Name
(N
)
269 and then Present
(Entity
(N
))
270 and then Ekind
(Entity
(N
)) = E_Constant
272 Val
:= Constant_Value
(Entity
(N
));
275 and then not Compile_Time_Known_Value
(Val
)
277 Reference_Seen
:= True;
283 end Is_Subp_Or_Const_Ref
;
285 procedure Find_Subp_Or_Const_Ref
is
286 new Traverse_Proc
(Is_Subp_Or_Const_Ref
);
288 -- Start of processing for Contains_Subp_Or_Const_Refs
291 Find_Subp_Or_Const_Ref
(N
);
293 return Reference_Seen
;
294 end Contains_Subp_Or_Const_Refs
;
300 function Has_Referencer
302 Top_Level
: Boolean := False) return Boolean
308 Has_Non_Subp_Const_Referencer
: Boolean := False;
309 -- Flag set for inlined subprogram bodies that do not contain
310 -- references to other subprograms or non-static constants.
317 -- Examine all declarations in reverse order, hiding all entities
318 -- from external visibility until a referencer has been found. The
319 -- algorithm recurses into nested packages.
321 Decl
:= Last
(Decls
);
322 while Present
(Decl
) loop
324 -- A stub is always considered a referencer
326 if Nkind
(Decl
) in N_Body_Stub
then
329 -- Package declaration
331 elsif Nkind
(Decl
) = N_Package_Declaration
332 and then not Has_Non_Subp_Const_Referencer
334 Spec
:= Specification
(Decl
);
336 -- Inspect the declarations of a non-generic package to try
337 -- and hide more entities from external visibility.
339 if not Is_Generic_Unit
(Defining_Entity
(Spec
)) then
340 if Has_Referencer
(Private_Declarations
(Spec
))
341 or else Has_Referencer
(Visible_Declarations
(Spec
))
349 elsif Nkind
(Decl
) = N_Package_Body
350 and then Present
(Corresponding_Spec
(Decl
))
352 Decl_Id
:= Corresponding_Spec
(Decl
);
354 -- A generic package body is a referencer. It would seem
355 -- that we only have to consider generics that can be
356 -- exported, i.e. where the corresponding spec is the
357 -- spec of the current package, but because of nested
358 -- instantiations, a fully private generic body may export
359 -- other private body entities. Furthermore, regardless of
360 -- whether there was a previous inlined subprogram, (an
361 -- instantiation of) the generic package may reference any
362 -- entity declared before it.
364 if Is_Generic_Unit
(Decl_Id
) then
367 -- Inspect the declarations of a non-generic package body to
368 -- try and hide more entities from external visibility.
370 elsif not Has_Non_Subp_Const_Referencer
371 and then Has_Referencer
(Declarations
(Decl
))
378 elsif Nkind
(Decl
) = N_Subprogram_Body
then
379 if Present
(Corresponding_Spec
(Decl
)) then
380 Decl_Id
:= Corresponding_Spec
(Decl
);
382 -- A generic subprogram body acts as a referencer
384 if Is_Generic_Unit
(Decl_Id
) then
388 -- An inlined subprogram body acts as a referencer
390 if Is_Inlined
(Decl_Id
)
391 or else Has_Pragma_Inline
(Decl_Id
)
393 -- Inspect the statements of the subprogram body
394 -- to determine whether the body references other
395 -- subprograms and/or non-static constants.
398 and then not Contains_Subp_Or_Const_Refs
(Decl
)
400 Has_Non_Subp_Const_Referencer
:= True;
406 -- Otherwise this is a stand alone subprogram body
409 Decl_Id
:= Defining_Entity
(Decl
);
411 -- An inlined body acts as a referencer. Note that an
412 -- inlined subprogram remains Is_Public as gigi requires
413 -- the flag to be set.
415 -- Note that we test Has_Pragma_Inline here rather than
416 -- Is_Inlined. We are compiling this for a client, and
417 -- it is the client who will decide if actual inlining
418 -- should occur, so we need to assume that the procedure
419 -- could be inlined for the purpose of accessing global
422 if Has_Pragma_Inline
(Decl_Id
) then
424 and then not Contains_Subp_Or_Const_Refs
(Decl
)
426 Has_Non_Subp_Const_Referencer
:= True;
431 Set_Is_Public
(Decl_Id
, False);
435 -- Exceptions, objects and renamings do not need to be public
436 -- if they are not followed by a construct which can reference
437 -- and export them. The Is_Public flag is reset on top level
438 -- entities only as anything nested is local to its context.
440 elsif Nkind_In
(Decl
, N_Exception_Declaration
,
441 N_Object_Declaration
,
442 N_Object_Renaming_Declaration
,
443 N_Subprogram_Declaration
,
444 N_Subprogram_Renaming_Declaration
)
446 Decl_Id
:= Defining_Entity
(Decl
);
449 and then not Is_Imported
(Decl_Id
)
450 and then not Is_Exported
(Decl_Id
)
451 and then No
(Interface_Name
(Decl_Id
))
453 (not Has_Non_Subp_Const_Referencer
454 or else Nkind
(Decl
) = N_Subprogram_Declaration
)
456 Set_Is_Public
(Decl_Id
, False);
463 return Has_Non_Subp_Const_Referencer
;
468 Discard
: Boolean := True;
469 pragma Unreferenced
(Discard
);
471 -- Start of processing for Hide_Public_Entities
474 -- The algorithm examines the top level declarations of a package
475 -- body in reverse looking for a construct that may export entities
476 -- declared prior to it. If such a scenario is encountered, then all
477 -- entities in the range Last (Decls) .. construct are hidden from
478 -- external visibility. Consider:
486 -- package body Pack is
487 -- External_Obj : ...; -- (1)
489 -- package body Gen is -- (2)
490 -- ... External_Obj ... -- (3)
493 -- Local_Obj : ...; -- (4)
496 -- In this example Local_Obj (4) must not be externally visible as
497 -- it cannot be exported by anything in Pack. The body of generic
498 -- package Gen (2) on the other hand acts as a "referencer" and may
499 -- export anything declared before it. Since the compiler does not
500 -- perform flow analysis, it is not possible to determine precisely
501 -- which entities will be exported when Gen is instantiated. In the
502 -- example above External_Obj (1) is exported at (3), but this may
503 -- not always be the case. The algorithm takes a conservative stance
504 -- and leaves entity External_Obj public.
506 Discard
:= Has_Referencer
(Decls
, Top_Level
=> True);
507 end Hide_Public_Entities
;
509 ----------------------------------
510 -- Install_Composite_Operations --
511 ----------------------------------
513 procedure Install_Composite_Operations
(P
: Entity_Id
) is
517 Id
:= First_Entity
(P
);
518 while Present
(Id
) loop
520 and then (Is_Limited_Composite
(Id
)
521 or else Is_Private_Composite
(Id
))
522 and then No
(Private_Component
(Id
))
524 Set_Is_Limited_Composite
(Id
, False);
525 Set_Is_Private_Composite
(Id
, False);
530 end Install_Composite_Operations
;
534 Save_Ghost_Mode
: constant Ghost_Mode_Type
:= Ghost_Mode
;
537 Last_Spec_Entity
: Entity_Id
;
542 -- Start of processing for Analyze_Package_Body_Helper
545 -- A [generic] package body "freezes" the contract of the nearest
546 -- enclosing package body and all other contracts encountered in the
547 -- same declarative part up to and excluding the package body:
549 -- package body Nearest_Enclosing_Package
550 -- with Refined_State => (State => Constit)
554 -- package body Freezes_Enclosing_Package_Body
555 -- with Refined_State => (State_2 => Constit_2)
560 -- with Refined_Depends => (Input => (Constit, Constit_2)) ...
562 -- This ensures that any annotations referenced by the contract of a
563 -- [generic] subprogram body declared within the current package body
564 -- are available. This form of "freezing" is decoupled from the usual
565 -- Freeze_xxx mechanism because it must also work in the context of
566 -- generics where normal freezing is disabled.
568 -- Only bodies coming from source should cause this type of "freezing"
570 if Comes_From_Source
(N
) then
571 Analyze_Previous_Contracts
(N
);
574 -- Find corresponding package specification, and establish the current
575 -- scope. The visible defining entity for the package is the defining
576 -- occurrence in the spec. On exit from the package body, all body
577 -- declarations are attached to the defining entity for the body, but
578 -- the later is never used for name resolution. In this fashion there
579 -- is only one visible entity that denotes the package.
581 -- Set Body_Id. Note that this will be reset to point to the generic
582 -- copy later on in the generic case.
584 Body_Id
:= Defining_Entity
(N
);
586 -- Body is body of package instantiation. Corresponding spec has already
589 if Present
(Corresponding_Spec
(N
)) then
590 Spec_Id
:= Corresponding_Spec
(N
);
591 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
594 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
597 and then Is_Package_Or_Generic_Package
(Spec_Id
)
599 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
601 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
602 Error_Msg_N
("cannot supply body for package renaming", N
);
605 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
606 Error_Msg_N
("redefinition of package body", N
);
611 Error_Msg_N
("missing specification for package body", N
);
615 if Is_Package_Or_Generic_Package
(Spec_Id
)
616 and then (Scope
(Spec_Id
) = Standard_Standard
617 or else Is_Child_Unit
(Spec_Id
))
618 and then not Unit_Requires_Body
(Spec_Id
)
620 if Ada_Version
= Ada_83
then
622 ("optional package body (not allowed in Ada 95)??", N
);
624 Error_Msg_N
("spec of this package does not allow a body", N
);
629 -- A package body is Ghost when the corresponding spec is Ghost. Set
630 -- the mode now to ensure that any nodes generated during analysis and
631 -- expansion are properly flagged as ignored Ghost.
633 Set_Ghost_Mode
(N
, Spec_Id
);
635 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
636 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
638 if Is_Child_Unit
(Spec_Id
) then
639 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
641 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
644 Set_Is_Child_Unit
(Body_Id
);
647 -- Generic package case
649 if Ekind
(Spec_Id
) = E_Generic_Package
then
651 -- Disable expansion and perform semantic analysis on copy. The
652 -- unannotated body will be used in all instantiations.
654 Body_Id
:= Defining_Entity
(N
);
655 Set_Ekind
(Body_Id
, E_Package_Body
);
656 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
657 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
658 Set_Body_Entity
(Spec_Id
, Body_Id
);
659 Set_Spec_Entity
(Body_Id
, Spec_Id
);
661 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
664 -- Once the contents of the generic copy and the template are
665 -- swapped, do the same for their respective aspect specifications.
667 Exchange_Aspects
(N
, New_N
);
669 -- Collect all contract-related source pragmas found within the
670 -- template and attach them to the contract of the package body.
671 -- This contract is used in the capture of global references within
674 Create_Generic_Contract
(N
);
676 -- Update Body_Id to point to the copied node for the remainder of
679 Body_Id
:= Defining_Entity
(N
);
683 -- The Body_Id is that of the copied node in the generic case, the
684 -- current node otherwise. Note that N was rewritten above, so we must
685 -- be sure to get the latest Body_Id value.
687 Set_Ekind
(Body_Id
, E_Package_Body
);
688 Set_Body_Entity
(Spec_Id
, Body_Id
);
689 Set_Spec_Entity
(Body_Id
, Spec_Id
);
691 -- Defining name for the package body is not a visible entity: Only the
692 -- defining name for the declaration is visible.
694 Set_Etype
(Body_Id
, Standard_Void_Type
);
695 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
696 Set_Corresponding_Spec
(N
, Spec_Id
);
697 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
699 -- The body entity is not used for semantics or code generation, but
700 -- it is attached to the entity list of the enclosing scope to simplify
701 -- the listing of back-annotations for the types it main contain.
703 if Scope
(Spec_Id
) /= Standard_Standard
then
704 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
707 -- Indicate that we are currently compiling the body of the package
709 Set_In_Package_Body
(Spec_Id
);
710 Set_Has_Completion
(Spec_Id
);
711 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
713 if Has_Aspects
(N
) then
714 Analyze_Aspect_Specifications
(N
, Body_Id
);
717 Push_Scope
(Spec_Id
);
719 -- Set SPARK_Mode only for non-generic package
721 if Ekind
(Spec_Id
) = E_Package
then
722 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
723 Set_SPARK_Aux_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
724 Set_SPARK_Pragma_Inherited
(Body_Id
);
725 Set_SPARK_Aux_Pragma_Inherited
(Body_Id
);
728 -- Inherit the "ghostness" of the package spec. Note that this property
729 -- is not directly inherited as the body may be subject to a different
730 -- Ghost assertion policy.
732 if Ghost_Mode
> None
or else Is_Ghost_Entity
(Spec_Id
) then
733 Set_Is_Ghost_Entity
(Body_Id
);
735 -- The Ghost policy in effect at the point of declaration and at the
736 -- point of completion must match (SPARK RM 6.9(14)).
738 Check_Ghost_Completion
(Spec_Id
, Body_Id
);
741 Set_Categorization_From_Pragmas
(N
);
743 Install_Visible_Declarations
(Spec_Id
);
744 Install_Private_Declarations
(Spec_Id
);
745 Install_Private_With_Clauses
(Spec_Id
);
746 Install_Composite_Operations
(Spec_Id
);
748 Check_Anonymous_Access_Types
(Spec_Id
, N
);
750 if Ekind
(Spec_Id
) = E_Generic_Package
then
751 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
754 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
755 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
757 -- This is a nested package, so it may be necessary to declare certain
758 -- inherited subprograms that are not yet visible because the parent
759 -- type's subprograms are now visible.
761 if Ekind
(Scope
(Spec_Id
)) = E_Package
762 and then Scope
(Spec_Id
) /= Standard_Standard
764 Declare_Inherited_Private_Subprograms
(Spec_Id
);
767 -- A package body "freezes" the contract of its initial declaration.
768 -- This analysis depends on attribute Corresponding_Spec being set. Only
769 -- bodies coming from source shuld cause this type of "freezing".
771 if Present
(Declarations
(N
)) then
772 Analyze_Declarations
(Declarations
(N
));
773 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
776 -- Verify that the SPARK_Mode of the body agrees with that of its spec
778 if Present
(SPARK_Pragma
(Body_Id
)) then
779 if Present
(SPARK_Aux_Pragma
(Spec_Id
)) then
780 if Get_SPARK_Mode_From_Pragma
(SPARK_Aux_Pragma
(Spec_Id
)) = Off
782 Get_SPARK_Mode_From_Pragma
(SPARK_Pragma
(Body_Id
)) = On
784 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
785 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
786 Error_Msg_Sloc
:= Sloc
(SPARK_Aux_Pragma
(Spec_Id
));
788 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
792 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
793 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
794 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
796 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
800 -- Analyze_Declarations has caused freezing of all types. Now generate
801 -- bodies for RACW primitives and stream attributes, if any.
803 if Ekind
(Spec_Id
) = E_Package
and then Has_RACW
(Spec_Id
) then
805 -- Attach subprogram bodies to support RACWs declared in spec
807 Append_RACW_Bodies
(Declarations
(N
), Spec_Id
);
808 Analyze_List
(Declarations
(N
));
811 HSS
:= Handled_Statement_Sequence
(N
);
813 if Present
(HSS
) then
814 Process_End_Label
(HSS
, 't', Spec_Id
);
817 -- Check that elaboration code in a preelaborable package body is
818 -- empty other than null statements and labels (RM 10.2.1(6)).
820 Validate_Null_Statement_Sequence
(N
);
823 Validate_Categorization_Dependency
(N
, Spec_Id
);
824 Check_Completion
(Body_Id
);
826 -- Generate start of body reference. Note that we do this fairly late,
827 -- because the call will use In_Extended_Main_Source_Unit as a check,
828 -- and we want to make sure that Corresponding_Stub links are set
830 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
832 -- For a generic package, collect global references and mark them on
833 -- the original body so that they are not resolved again at the point
836 if Ekind
(Spec_Id
) /= E_Package
then
837 Save_Global_References
(Original_Node
(N
));
841 -- The entities of the package body have so far been chained onto the
842 -- declaration chain for the spec. That's been fine while we were in the
843 -- body, since we wanted them to be visible, but now that we are leaving
844 -- the package body, they are no longer visible, so we remove them from
845 -- the entity chain of the package spec entity, and copy them to the
846 -- entity chain of the package body entity, where they will never again
849 if Present
(Last_Spec_Entity
) then
850 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
851 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
852 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
853 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
856 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
857 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
858 Set_First_Entity
(Spec_Id
, Empty
);
859 Set_Last_Entity
(Spec_Id
, Empty
);
862 End_Package_Scope
(Spec_Id
);
864 -- All entities declared in body are not visible
870 E
:= First_Entity
(Body_Id
);
871 while Present
(E
) loop
872 Set_Is_Immediately_Visible
(E
, False);
873 Set_Is_Potentially_Use_Visible
(E
, False);
876 -- Child units may appear on the entity list (e.g. if they appear
877 -- in the context of a subunit) but they are not body entities.
879 if not Is_Child_Unit
(E
) then
880 Set_Is_Package_Body_Entity
(E
);
887 Check_References
(Body_Id
);
889 -- For a generic unit, check that the formal parameters are referenced,
890 -- and that local variables are used, as for regular packages.
892 if Ekind
(Spec_Id
) = E_Generic_Package
then
893 Check_References
(Spec_Id
);
896 -- At this point all entities of the package body are externally visible
897 -- to the linker as their Is_Public flag is set to True. This proactive
898 -- approach is necessary because an inlined or a generic body for which
899 -- code is generated in other units may need to see these entities. Cut
900 -- down the number of global symbols that do not neet public visibility
901 -- as this has two beneficial effects:
902 -- (1) It makes the compilation process more efficient.
903 -- (2) It gives the code generatormore freedom to optimize within each
904 -- unit, especially subprograms.
906 -- This is done only for top level library packages or child units as
907 -- the algorithm does a top down traversal of the package body.
909 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
910 and then not Is_Generic_Unit
(Spec_Id
)
912 Hide_Public_Entities
(Declarations
(N
));
915 -- If expander is not active, then here is where we turn off the
916 -- In_Package_Body flag, otherwise it is turned off at the end of the
917 -- corresponding expansion routine. If this is an instance body, we need
918 -- to qualify names of local entities, because the body may have been
919 -- compiled as a preliminary to another instantiation.
921 if not Expander_Active
then
922 Set_In_Package_Body
(Spec_Id
, False);
924 if Is_Generic_Instance
(Spec_Id
)
925 and then Operating_Mode
= Generate_Code
927 Qualify_Entity_Names
(N
);
931 Ghost_Mode
:= Save_Ghost_Mode
;
932 end Analyze_Package_Body_Helper
;
934 ---------------------------------
935 -- Analyze_Package_Declaration --
936 ---------------------------------
938 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
939 Id
: constant Node_Id
:= Defining_Entity
(N
);
941 Body_Required
: Boolean;
942 -- True when this package declaration requires a corresponding body
945 -- True when this package declaration is not a nested declaration
948 -- True when in the context of a declared pure library unit
952 Write_Str
("==> package spec ");
953 Write_Name
(Chars
(Id
));
954 Write_Str
(" from ");
955 Write_Location
(Sloc
(N
));
960 Generate_Definition
(Id
);
962 Set_Ekind
(Id
, E_Package
);
963 Set_Etype
(Id
, Standard_Void_Type
);
965 -- Set SPARK_Mode from context only for non-generic package
967 if Ekind
(Id
) = E_Package
then
968 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
969 Set_SPARK_Aux_Pragma
(Id
, SPARK_Mode_Pragma
);
970 Set_SPARK_Pragma_Inherited
(Id
);
971 Set_SPARK_Aux_Pragma_Inherited
(Id
);
974 -- A package declared within a Ghost refion is automatically Ghost
975 -- (SPARK RM 6.9(2)).
977 if Ghost_Mode
> None
then
978 Set_Is_Ghost_Entity
(Id
);
981 -- Analyze aspect specifications immediately, since we need to recognize
982 -- things like Pure early enough to diagnose violations during analysis.
984 if Has_Aspects
(N
) then
985 Analyze_Aspect_Specifications
(N
, Id
);
988 -- Ada 2005 (AI-217): Check if the package has been illegally named
989 -- in a limited-with clause of its own context. In this case the error
990 -- has been previously notified by Analyze_Context.
992 -- limited with Pkg; -- ERROR
993 -- package Pkg is ...
995 if From_Limited_With
(Id
) then
1001 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
1002 Set_Is_Pure
(Id
, PF
);
1004 Set_Categorization_From_Pragmas
(N
);
1006 Analyze
(Specification
(N
));
1007 Validate_Categorization_Dependency
(N
, Id
);
1009 Body_Required
:= Unit_Requires_Body
(Id
);
1011 -- When this spec does not require an explicit body, we know that there
1012 -- are no entities requiring completion in the language sense; we call
1013 -- Check_Completion here only to ensure that any nested package
1014 -- declaration that requires an implicit body gets one. (In the case
1015 -- where a body is required, Check_Completion is called at the end of
1016 -- the body's declarative part.)
1018 if not Body_Required
then
1022 Comp_Unit
:= Nkind
(Parent
(N
)) = N_Compilation_Unit
;
1026 -- Set Body_Required indication on the compilation unit node, and
1027 -- determine whether elaboration warnings may be meaningful on it.
1029 Set_Body_Required
(Parent
(N
), Body_Required
);
1031 if not Body_Required
then
1032 Set_Suppress_Elaboration_Warnings
(Id
);
1036 End_Package_Scope
(Id
);
1038 -- For the declaration of a library unit that is a remote types package,
1039 -- check legality rules regarding availability of stream attributes for
1040 -- types that contain non-remote access values. This subprogram performs
1041 -- visibility tests that rely on the fact that we have exited the scope
1045 Validate_RT_RAT_Component
(N
);
1048 if Debug_Flag_C
then
1050 Write_Str
("<== package spec ");
1051 Write_Name
(Chars
(Id
));
1052 Write_Str
(" from ");
1053 Write_Location
(Sloc
(N
));
1056 end Analyze_Package_Declaration
;
1058 -----------------------------------
1059 -- Analyze_Package_Specification --
1060 -----------------------------------
1062 -- Note that this code is shared for the analysis of generic package specs
1063 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
1065 procedure Analyze_Package_Specification
(N
: Node_Id
) is
1066 Id
: constant Entity_Id
:= Defining_Entity
(N
);
1067 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
1068 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
1069 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
1072 Public_Child
: Boolean;
1074 Private_With_Clauses_Installed
: Boolean := False;
1075 -- In Ada 2005, private with_clauses are visible in the private part
1076 -- of a nested package, even if it appears in the public part of the
1077 -- enclosing package. This requires a separate step to install these
1078 -- private_with_clauses, and remove them at the end of the nested
1081 procedure Check_One_Tagged_Type_Or_Extension_At_Most
;
1082 -- Issue an error in SPARK mode if a package specification contains
1083 -- more than one tagged type or type extension.
1085 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
1086 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
1087 -- Is_True_Constant) on all variables that are entities of Id, and on
1088 -- the chain whose first element is FE. A recursive call is made for all
1089 -- packages and generic packages.
1091 procedure Generate_Parent_References
;
1092 -- For a child unit, generate references to parent units, for
1093 -- GPS navigation purposes.
1095 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
1096 -- Child and Unit are entities of compilation units. True if Child
1097 -- is a public child of Parent as defined in 10.1.1
1099 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
1100 -- Reject completion of an incomplete or private type declarations
1101 -- having a known discriminant part by an unchecked union.
1103 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
1104 -- Given the package entity of a generic package instantiation or
1105 -- formal package whose corresponding generic is a child unit, installs
1106 -- the private declarations of each of the child unit's parents.
1107 -- This has to be done at the point of entering the instance package's
1108 -- private part rather than being done in Sem_Ch12.Install_Parent
1109 -- (which is where the parents' visible declarations are installed).
1111 ------------------------------------------------
1112 -- Check_One_Tagged_Type_Or_Extension_At_Most --
1113 ------------------------------------------------
1115 procedure Check_One_Tagged_Type_Or_Extension_At_Most
is
1118 procedure Check_Decls
(Decls
: List_Id
);
1119 -- Check that either Previous is Empty and Decls does not contain
1120 -- more than one tagged type or type extension, or Previous is
1121 -- already set and Decls contains no tagged type or type extension.
1127 procedure Check_Decls
(Decls
: List_Id
) is
1131 Decl
:= First
(Decls
);
1132 while Present
(Decl
) loop
1133 if Nkind
(Decl
) = N_Full_Type_Declaration
1134 and then Is_Tagged_Type
(Defining_Identifier
(Decl
))
1136 if No
(Previous
) then
1140 Error_Msg_Sloc
:= Sloc
(Previous
);
1141 Check_SPARK_05_Restriction
1142 ("at most one tagged type or type extension allowed",
1143 "\\ previous declaration#",
1152 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
1156 Check_Decls
(Vis_Decls
);
1158 if Present
(Priv_Decls
) then
1159 Check_Decls
(Priv_Decls
);
1161 end Check_One_Tagged_Type_Or_Extension_At_Most
;
1163 ---------------------
1164 -- Clear_Constants --
1165 ---------------------
1167 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
1171 -- Ignore package renamings, not interesting and they can cause self
1172 -- referential loops in the code below.
1174 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
1178 -- Note: in the loop below, the check for Next_Entity pointing back
1179 -- to the package entity may seem odd, but it is needed, because a
1180 -- package can contain a renaming declaration to itself, and such
1181 -- renamings are generated automatically within package instances.
1184 while Present
(E
) and then E
/= Id
loop
1185 if Is_Assignable
(E
) then
1186 Set_Never_Set_In_Source
(E
, False);
1187 Set_Is_True_Constant
(E
, False);
1188 Set_Current_Value
(E
, Empty
);
1189 Set_Is_Known_Null
(E
, False);
1190 Set_Last_Assignment
(E
, Empty
);
1192 if not Can_Never_Be_Null
(E
) then
1193 Set_Is_Known_Non_Null
(E
, False);
1196 elsif Is_Package_Or_Generic_Package
(E
) then
1197 Clear_Constants
(E
, First_Entity
(E
));
1198 Clear_Constants
(E
, First_Private_Entity
(E
));
1203 end Clear_Constants
;
1205 --------------------------------
1206 -- Generate_Parent_References --
1207 --------------------------------
1209 procedure Generate_Parent_References
is
1210 Decl
: constant Node_Id
:= Parent
(N
);
1213 if Id
= Cunit_Entity
(Main_Unit
)
1214 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
1216 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1218 elsif not Nkind_In
(Unit
(Cunit
(Main_Unit
)), N_Subprogram_Body
,
1221 -- If current unit is an ancestor of main unit, generate a
1222 -- reference to its own parent.
1226 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
1229 if Nkind
(Main_Spec
) = N_Package_Body
then
1230 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
1233 U
:= Parent_Spec
(Main_Spec
);
1234 while Present
(U
) loop
1235 if U
= Parent
(Decl
) then
1236 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1239 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
1243 U
:= Parent_Spec
(Unit
(U
));
1248 end Generate_Parent_References
;
1250 ---------------------
1251 -- Is_Public_Child --
1252 ---------------------
1254 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
1256 if not Is_Private_Descendant
(Child
) then
1259 if Child
= Unit
then
1260 return not Private_Present
(
1261 Parent
(Unit_Declaration_Node
(Child
)));
1263 return Is_Public_Child
(Scope
(Child
), Unit
);
1266 end Is_Public_Child
;
1268 ----------------------------------------
1269 -- Inspect_Unchecked_Union_Completion --
1270 ----------------------------------------
1272 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
1276 Decl
:= First
(Decls
);
1277 while Present
(Decl
) loop
1279 -- We are looking at an incomplete or private type declaration
1280 -- with a known_discriminant_part whose full view is an
1283 if Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
1284 N_Private_Type_Declaration
)
1285 and then Has_Discriminants
(Defining_Identifier
(Decl
))
1286 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
1288 Is_Unchecked_Union
(Full_View
(Defining_Identifier
(Decl
)))
1291 ("completion of discriminated partial view "
1292 & "cannot be an unchecked union",
1293 Full_View
(Defining_Identifier
(Decl
)));
1298 end Inspect_Unchecked_Union_Completion
;
1300 -----------------------------------------
1301 -- Install_Parent_Private_Declarations --
1302 -----------------------------------------
1304 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
1305 Inst_Par
: Entity_Id
;
1306 Gen_Par
: Entity_Id
;
1307 Inst_Node
: Node_Id
;
1310 Inst_Par
:= Inst_Id
;
1313 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
1314 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
1315 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
1317 if Nkind_In
(Inst_Node
, N_Package_Instantiation
,
1318 N_Formal_Package_Declaration
)
1319 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
1321 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
1323 if Present
(Renamed_Entity
(Inst_Par
)) then
1324 Inst_Par
:= Renamed_Entity
(Inst_Par
);
1329 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
1331 -- Install the private declarations and private use clauses
1332 -- of a parent instance of the child instance, unless the
1333 -- parent instance private declarations have already been
1334 -- installed earlier in Analyze_Package_Specification, which
1335 -- happens when a generic child is instantiated, and the
1336 -- instance is a child of the parent instance.
1338 -- Installing the use clauses of the parent instance twice
1339 -- is both unnecessary and wrong, because it would cause the
1340 -- clauses to be chained to themselves in the use clauses
1341 -- list of the scope stack entry. That in turn would cause
1342 -- an endless loop from End_Use_Clauses upon scope exit.
1344 -- The parent is now fully visible. It may be a hidden open
1345 -- scope if we are currently compiling some child instance
1346 -- declared within it, but while the current instance is being
1347 -- compiled the parent is immediately visible. In particular
1348 -- its entities must remain visible if a stack save/restore
1349 -- takes place through a call to Rtsfind.
1351 if Present
(Gen_Par
) then
1352 if not In_Private_Part
(Inst_Par
) then
1353 Install_Private_Declarations
(Inst_Par
);
1354 Set_Use
(Private_Declarations
1356 (Unit_Declaration_Node
(Inst_Par
))));
1357 Set_Is_Hidden_Open_Scope
(Inst_Par
, False);
1360 -- If we've reached the end of the generic instance parents,
1361 -- then finish off by looping through the nongeneric parents
1362 -- and installing their private declarations.
1364 -- If one of the non-generic parents is itself on the scope
1365 -- stack, do not install its private declarations: they are
1366 -- installed in due time when the private part of that parent
1367 -- is analyzed. This is delicate ???
1370 while Present
(Inst_Par
)
1371 and then Inst_Par
/= Standard_Standard
1372 and then (not In_Open_Scopes
(Inst_Par
)
1373 or else not In_Private_Part
(Inst_Par
))
1375 Install_Private_Declarations
(Inst_Par
);
1376 Set_Use
(Private_Declarations
1378 (Unit_Declaration_Node
(Inst_Par
))));
1379 Inst_Par
:= Scope
(Inst_Par
);
1389 end Install_Parent_Private_Declarations
;
1391 -- Start of processing for Analyze_Package_Specification
1394 if Present
(Vis_Decls
) then
1395 Analyze_Declarations
(Vis_Decls
);
1398 -- Inspect the entities defined in the package and ensure that all
1399 -- incomplete types have received full declarations. Build default
1400 -- initial condition and invariant procedures for all qualifying types.
1402 E
:= First_Entity
(Id
);
1403 while Present
(E
) loop
1405 -- Check on incomplete types
1407 -- AI05-0213: A formal incomplete type has no completion
1409 if Ekind
(E
) = E_Incomplete_Type
1410 and then No
(Full_View
(E
))
1411 and then not Is_Generic_Type
(E
)
1413 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
1418 -- Each private type subject to pragma Default_Initial_Condition
1419 -- declares a specialized procedure which verifies the assumption
1420 -- of the pragma. The declaration appears in the visible part of
1421 -- the package to allow for being called from the outside.
1423 if Has_Default_Init_Cond
(E
) then
1424 Build_Default_Init_Cond_Procedure_Declaration
(E
);
1426 -- A private extension inherits the default initial condition
1427 -- procedure from its parent type.
1429 elsif Has_Inherited_Default_Init_Cond
(E
) then
1430 Inherit_Default_Init_Cond_Procedure
(E
);
1433 -- If invariants are present, build the invariant procedure for a
1434 -- private type, but not any of its subtypes or interface types.
1436 if Has_Invariants
(E
) then
1437 if Ekind
(E
) = E_Private_Subtype
then
1440 Build_Invariant_Procedure
(E
, N
);
1448 if Is_Remote_Call_Interface
(Id
)
1449 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
1451 Validate_RCI_Declarations
(Id
);
1454 -- Save global references in the visible declarations, before installing
1455 -- private declarations of parent unit if there is one, because the
1456 -- privacy status of types defined in the parent will change. This is
1457 -- only relevant for generic child units, but is done in all cases for
1460 if Ekind
(Id
) = E_Generic_Package
1461 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1464 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1465 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1467 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1468 Save_Global_References
(Orig_Decl
);
1469 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1473 -- If package is a public child unit, then make the private declarations
1474 -- of the parent visible.
1476 Public_Child
:= False;
1480 Pack_Decl
: Node_Id
;
1485 Par_Spec
:= Parent_Spec
(Parent
(N
));
1487 -- If the package is formal package of an enclosing generic, it is
1488 -- transformed into a local generic declaration, and compiled to make
1489 -- its spec available. We need to retrieve the original generic to
1490 -- determine whether it is a child unit, and install its parents.
1494 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1496 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1497 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1500 if Present
(Par_Spec
) then
1501 Generate_Parent_References
;
1503 while Scope
(Par
) /= Standard_Standard
1504 and then Is_Public_Child
(Id
, Par
)
1505 and then In_Open_Scopes
(Par
)
1507 Public_Child
:= True;
1509 Install_Private_Declarations
(Par
);
1510 Install_Private_With_Clauses
(Par
);
1511 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1512 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1517 if Is_Compilation_Unit
(Id
) then
1518 Install_Private_With_Clauses
(Id
);
1521 -- The current compilation unit may include private with_clauses,
1522 -- which are visible in the private part of the current nested
1523 -- package, and have to be installed now. This is not done for
1524 -- nested instantiations, where the private with_clauses of the
1525 -- enclosing unit have no effect once the instantiation info is
1526 -- established and we start analyzing the package declaration.
1529 Comp_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
1531 if Is_Package_Or_Generic_Package
(Comp_Unit
)
1532 and then not In_Private_Part
(Comp_Unit
)
1533 and then not In_Instance
1535 Install_Private_With_Clauses
(Comp_Unit
);
1536 Private_With_Clauses_Installed
:= True;
1541 -- If this is a package associated with a generic instance or formal
1542 -- package, then the private declarations of each of the generic's
1543 -- parents must be installed at this point.
1545 if Is_Generic_Instance
(Id
) then
1546 Install_Parent_Private_Declarations
(Id
);
1549 -- Analyze private part if present. The flag In_Private_Part is reset
1550 -- in End_Package_Scope.
1552 L
:= Last_Entity
(Id
);
1554 if Present
(Priv_Decls
) then
1555 Set_In_Private_Part
(Id
);
1557 -- Upon entering a public child's private part, it may be necessary
1558 -- to declare subprograms that were derived in the package's visible
1559 -- part but not yet made visible.
1561 if Public_Child
then
1562 Declare_Inherited_Private_Subprograms
(Id
);
1565 Analyze_Declarations
(Priv_Decls
);
1567 -- Check the private declarations for incomplete deferred constants
1569 Inspect_Deferred_Constant_Completion
(Priv_Decls
);
1571 -- The first private entity is the immediate follower of the last
1572 -- visible entity, if there was one.
1575 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1577 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
1580 -- There may be inherited private subprograms that need to be declared,
1581 -- even in the absence of an explicit private part. If there are any
1582 -- public declarations in the package and the package is a public child
1583 -- unit, then an implicit private part is assumed.
1585 elsif Present
(L
) and then Public_Child
then
1586 Set_In_Private_Part
(Id
);
1587 Declare_Inherited_Private_Subprograms
(Id
);
1588 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1591 E
:= First_Entity
(Id
);
1592 while Present
(E
) loop
1594 -- Check rule of 3.6(11), which in general requires waiting till all
1595 -- full types have been seen.
1597 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1598 Check_Aliased_Component_Types
(E
);
1601 -- Check preelaborable initialization for full type completing a
1602 -- private type for which pragma Preelaborable_Initialization given.
1605 and then Must_Have_Preelab_Init
(E
)
1606 and then not Has_Preelaborable_Initialization
(E
)
1609 ("full view of & does not have preelaborable initialization", E
);
1612 -- An invariant may appear on a full view of a type
1615 and then Has_Private_Declaration
(E
)
1616 and then Nkind
(Parent
(E
)) = N_Full_Type_Declaration
1619 IP_Built
: Boolean := False;
1622 if Has_Aspects
(Parent
(E
)) then
1627 ASN
:= First
(Aspect_Specifications
(Parent
(E
)));
1628 while Present
(ASN
) loop
1629 if Nam_In
(Chars
(Identifier
(ASN
)),
1631 Name_Type_Invariant
)
1633 Build_Invariant_Procedure
(E
, N
);
1643 -- Invariants may have been inherited from progenitors
1646 and then Has_Interfaces
(E
)
1647 and then Has_Inheritable_Invariants
(E
)
1648 and then not Is_Interface
(E
)
1649 and then not Is_Class_Wide_Type
(E
)
1651 Build_Invariant_Procedure
(E
, N
);
1659 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1660 -- declaration having a known_discriminant_part shall not be an
1661 -- unchecked union type.
1663 if Present
(Vis_Decls
) then
1664 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1667 if Present
(Priv_Decls
) then
1668 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1671 if Ekind
(Id
) = E_Generic_Package
1672 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1673 and then Present
(Priv_Decls
)
1675 -- Save global references in private declarations, ignoring the
1676 -- visible declarations that were processed earlier.
1679 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1680 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1681 Save_Form
: constant List_Id
:=
1682 Generic_Formal_Declarations
(Orig_Decl
);
1685 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1686 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1687 Save_Global_References
(Orig_Decl
);
1688 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1689 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1693 Process_End_Label
(N
, 'e', Id
);
1695 -- Remove private_with_clauses of enclosing compilation unit, if they
1698 if Private_With_Clauses_Installed
then
1699 Remove_Private_With_Clauses
(Cunit
(Current_Sem_Unit
));
1702 -- For the case of a library level package, we must go through all the
1703 -- entities clearing the indications that the value may be constant and
1704 -- not modified. Why? Because any client of this package may modify
1705 -- these values freely from anywhere. This also applies to any nested
1706 -- packages or generic packages.
1708 -- For now we unconditionally clear constants for packages that are
1709 -- instances of generic packages. The reason is that we do not have the
1710 -- body yet, and we otherwise think things are unreferenced when they
1711 -- are not. This should be fixed sometime (the effect is not terrible,
1712 -- we just lose some warnings, and also some cases of value propagation)
1715 if Is_Library_Level_Entity
(Id
)
1716 or else Is_Generic_Instance
(Id
)
1718 Clear_Constants
(Id
, First_Entity
(Id
));
1719 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1722 -- Issue an error in SPARK mode if a package specification contains
1723 -- more than one tagged type or type extension.
1725 Check_One_Tagged_Type_Or_Extension_At_Most
;
1727 -- If switch set, output information on why body required
1729 if List_Body_Required_Info
1730 and then In_Extended_Main_Source_Unit
(Id
)
1731 and then Unit_Requires_Body
(Id
)
1733 Unit_Requires_Body_Info
(Id
);
1735 end Analyze_Package_Specification
;
1737 --------------------------------------
1738 -- Analyze_Private_Type_Declaration --
1739 --------------------------------------
1741 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1742 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1743 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1746 Generate_Definition
(Id
);
1747 Set_Is_Pure
(Id
, PF
);
1748 Init_Size_Align
(Id
);
1750 if not Is_Package_Or_Generic_Package
(Current_Scope
)
1751 or else In_Private_Part
(Current_Scope
)
1753 Error_Msg_N
("invalid context for private declaration", N
);
1756 New_Private_Type
(N
, Id
, N
);
1757 Set_Depends_On_Private
(Id
);
1759 -- A type declared within a Ghost region is automatically Ghost
1760 -- (SPARK RM 6.9(2)).
1762 if Ghost_Mode
> None
then
1763 Set_Is_Ghost_Entity
(Id
);
1766 if Has_Aspects
(N
) then
1767 Analyze_Aspect_Specifications
(N
, Id
);
1769 end Analyze_Private_Type_Declaration
;
1771 ----------------------------------
1772 -- Check_Anonymous_Access_Types --
1773 ----------------------------------
1775 procedure Check_Anonymous_Access_Types
1776 (Spec_Id
: Entity_Id
;
1783 -- Itype references are only needed by gigi, to force elaboration of
1784 -- itypes. In the absence of code generation, they are not needed.
1786 if not Expander_Active
then
1790 E
:= First_Entity
(Spec_Id
);
1791 while Present
(E
) loop
1792 if Ekind
(E
) = E_Anonymous_Access_Type
1793 and then From_Limited_With
(E
)
1795 IR
:= Make_Itype_Reference
(Sloc
(P_Body
));
1798 if No
(Declarations
(P_Body
)) then
1799 Set_Declarations
(P_Body
, New_List
(IR
));
1801 Prepend
(IR
, Declarations
(P_Body
));
1807 end Check_Anonymous_Access_Types
;
1809 -------------------------------------------
1810 -- Declare_Inherited_Private_Subprograms --
1811 -------------------------------------------
1813 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1815 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1816 -- Check whether an inherited subprogram S is an operation of an
1817 -- untagged derived type T.
1819 ---------------------
1820 -- Is_Primitive_Of --
1821 ---------------------
1823 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1827 -- If the full view is a scalar type, the type is the anonymous base
1828 -- type, but the operation mentions the first subtype, so check the
1829 -- signature against the base type.
1831 if Base_Type
(Etype
(S
)) = Base_Type
(T
) then
1835 Formal
:= First_Formal
(S
);
1836 while Present
(Formal
) loop
1837 if Base_Type
(Etype
(Formal
)) = Base_Type
(T
) then
1841 Next_Formal
(Formal
);
1846 end Is_Primitive_Of
;
1853 Op_Elmt_2
: Elmt_Id
;
1854 Prim_Op
: Entity_Id
;
1855 New_Op
: Entity_Id
:= Empty
;
1856 Parent_Subp
: Entity_Id
;
1859 -- Start of processing for Declare_Inherited_Private_Subprograms
1862 E
:= First_Entity
(Id
);
1863 while Present
(E
) loop
1865 -- If the entity is a nonprivate type extension whose parent type
1866 -- is declared in an open scope, then the type may have inherited
1867 -- operations that now need to be made visible. Ditto if the entity
1868 -- is a formal derived type in a child unit.
1870 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1872 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1873 and then Is_Generic_Type
(E
)))
1874 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1875 and then Is_Base_Type
(E
)
1877 if Is_Tagged_Type
(E
) then
1878 Op_List
:= Primitive_Operations
(E
);
1880 Tag
:= First_Tag_Component
(E
);
1882 Op_Elmt
:= First_Elmt
(Op_List
);
1883 while Present
(Op_Elmt
) loop
1884 Prim_Op
:= Node
(Op_Elmt
);
1886 -- Search primitives that are implicit operations with an
1887 -- internal name whose parent operation has a normal name.
1889 if Present
(Alias
(Prim_Op
))
1890 and then Find_Dispatching_Type
(Alias
(Prim_Op
)) /= E
1891 and then not Comes_From_Source
(Prim_Op
)
1892 and then Is_Internal_Name
(Chars
(Prim_Op
))
1893 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1895 Parent_Subp
:= Alias
(Prim_Op
);
1897 -- Case 1: Check if the type has also an explicit
1898 -- overriding for this primitive.
1900 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1901 while Present
(Op_Elmt_2
) loop
1903 -- Skip entities with attribute Interface_Alias since
1904 -- they are not overriding primitives (these entities
1905 -- link an interface primitive with their covering
1908 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
1909 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
1910 and then No
(Interface_Alias
(Node
(Op_Elmt_2
)))
1912 -- The private inherited operation has been
1913 -- overridden by an explicit subprogram:
1914 -- replace the former by the latter.
1916 New_Op
:= Node
(Op_Elmt_2
);
1917 Replace_Elmt
(Op_Elmt
, New_Op
);
1918 Remove_Elmt
(Op_List
, Op_Elmt_2
);
1919 Set_Overridden_Operation
(New_Op
, Parent_Subp
);
1921 -- We don't need to inherit its dispatching slot.
1922 -- Set_All_DT_Position has previously ensured that
1923 -- the same slot was assigned to the two primitives
1926 and then Present
(DTC_Entity
(New_Op
))
1927 and then Present
(DTC_Entity
(Prim_Op
))
1930 (DT_Position
(New_Op
) = DT_Position
(Prim_Op
));
1934 goto Next_Primitive
;
1937 Next_Elmt
(Op_Elmt_2
);
1940 -- Case 2: We have not found any explicit overriding and
1941 -- hence we need to declare the operation (i.e., make it
1944 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1946 -- Inherit the dispatching slot if E is already frozen
1949 and then Present
(DTC_Entity
(Alias
(Prim_Op
)))
1951 Set_DTC_Entity_Value
(E
, New_Op
);
1952 Set_DT_Position_Value
(New_Op
,
1953 DT_Position
(Alias
(Prim_Op
)));
1957 (Is_Dispatching_Operation
(New_Op
)
1958 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
1960 -- Substitute the new operation for the old one in the
1961 -- type's primitive operations list. Since the new
1962 -- operation was also just added to the end of list,
1963 -- the last element must be removed.
1965 -- (Question: is there a simpler way of declaring the
1966 -- operation, say by just replacing the name of the
1967 -- earlier operation, reentering it in the in the symbol
1968 -- table (how?), and marking it as private???)
1970 Replace_Elmt
(Op_Elmt
, New_Op
);
1971 Remove_Last_Elmt
(Op_List
);
1975 Next_Elmt
(Op_Elmt
);
1978 -- Generate listing showing the contents of the dispatch table
1980 if Debug_Flag_ZZ
then
1985 -- For untagged type, scan forward to locate inherited hidden
1988 Prim_Op
:= Next_Entity
(E
);
1989 while Present
(Prim_Op
) loop
1990 if Is_Subprogram
(Prim_Op
)
1991 and then Present
(Alias
(Prim_Op
))
1992 and then not Comes_From_Source
(Prim_Op
)
1993 and then Is_Internal_Name
(Chars
(Prim_Op
))
1994 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1995 and then Is_Primitive_Of
(E
, Prim_Op
)
1997 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
2000 Next_Entity
(Prim_Op
);
2002 -- Derived operations appear immediately after the type
2003 -- declaration (or the following subtype indication for
2004 -- a derived scalar type). Further declarations cannot
2005 -- include inherited operations of the type.
2007 if Present
(Prim_Op
) then
2008 exit when Ekind
(Prim_Op
) not in Overloadable_Kind
;
2016 end Declare_Inherited_Private_Subprograms
;
2018 -----------------------
2019 -- End_Package_Scope --
2020 -----------------------
2022 procedure End_Package_Scope
(P
: Entity_Id
) is
2024 Uninstall_Declarations
(P
);
2026 end End_Package_Scope
;
2028 ---------------------------
2029 -- Exchange_Declarations --
2030 ---------------------------
2032 procedure Exchange_Declarations
(Id
: Entity_Id
) is
2033 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
2034 H1
: constant Entity_Id
:= Homonym
(Id
);
2035 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
2040 -- If missing full declaration for type, nothing to exchange
2042 if No
(Full_Id
) then
2046 -- Otherwise complete the exchange, and preserve semantic links
2048 Next2
:= Next_Entity
(Full_Id
);
2049 H2
:= Homonym
(Full_Id
);
2051 -- Reset full declaration pointer to reflect the switched entities and
2052 -- readjust the next entity chains.
2054 Exchange_Entities
(Id
, Full_Id
);
2056 Set_Next_Entity
(Id
, Next1
);
2057 Set_Homonym
(Id
, H1
);
2059 Set_Full_View
(Full_Id
, Id
);
2060 Set_Next_Entity
(Full_Id
, Next2
);
2061 Set_Homonym
(Full_Id
, H2
);
2062 end Exchange_Declarations
;
2064 ----------------------------
2065 -- Install_Package_Entity --
2066 ----------------------------
2068 procedure Install_Package_Entity
(Id
: Entity_Id
) is
2070 if not Is_Internal
(Id
) then
2071 if Debug_Flag_E
then
2072 Write_Str
("Install: ");
2073 Write_Name
(Chars
(Id
));
2077 if Is_Child_Unit
(Id
) then
2080 -- Do not enter implicitly inherited non-overridden subprograms of
2081 -- a tagged type back into visibility if they have non-conformant
2082 -- homographs (Ada RM 8.3 12.3/2).
2084 elsif Is_Hidden_Non_Overridden_Subpgm
(Id
) then
2088 Set_Is_Immediately_Visible
(Id
);
2091 end Install_Package_Entity
;
2093 ----------------------------------
2094 -- Install_Private_Declarations --
2095 ----------------------------------
2097 procedure Install_Private_Declarations
(P
: Entity_Id
) is
2100 Priv_Deps
: Elist_Id
;
2102 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
);
2103 -- When the full view of a private type is made available, we do the
2104 -- same for its private dependents under proper visibility conditions.
2105 -- When compiling a grand-chid unit this needs to be done recursively.
2107 -----------------------------
2108 -- Swap_Private_Dependents --
2109 -----------------------------
2111 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
) is
2114 Priv_Elmt
: Elmt_Id
;
2118 Priv_Elmt
:= First_Elmt
(Priv_Deps
);
2119 while Present
(Priv_Elmt
) loop
2120 Priv
:= Node
(Priv_Elmt
);
2122 -- Before the exchange, verify that the presence of the Full_View
2123 -- field. This field will be empty if the entity has already been
2124 -- installed due to a previous call.
2126 if Present
(Full_View
(Priv
)) and then Is_Visible_Dependent
(Priv
)
2128 if Is_Private_Type
(Priv
) then
2129 Deps
:= Private_Dependents
(Priv
);
2135 -- For each subtype that is swapped, we also swap the reference
2136 -- to it in Private_Dependents, to allow access to it when we
2137 -- swap them out in End_Package_Scope.
2139 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
2141 -- Ensure that both views of the dependent private subtype are
2142 -- immediately visible if within some open scope. Check full
2143 -- view before exchanging views.
2145 if In_Open_Scopes
(Scope
(Full_View
(Priv
))) then
2146 Set_Is_Immediately_Visible
(Priv
);
2149 Exchange_Declarations
(Priv
);
2150 Set_Is_Immediately_Visible
2151 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
2153 Set_Is_Potentially_Use_Visible
2154 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
2156 -- Within a child unit, recurse, except in generic child unit,
2157 -- which (unfortunately) handle private_dependents separately.
2160 and then Is_Child_Unit
(Cunit_Entity
(Current_Sem_Unit
))
2161 and then not Is_Empty_Elmt_List
(Deps
)
2162 and then not Inside_A_Generic
2164 Swap_Private_Dependents
(Deps
);
2168 Next_Elmt
(Priv_Elmt
);
2170 end Swap_Private_Dependents
;
2172 -- Start of processing for Install_Private_Declarations
2175 -- First exchange declarations for private types, so that the full
2176 -- declaration is visible. For each private type, we check its
2177 -- Private_Dependents list and also exchange any subtypes of or derived
2178 -- types from it. Finally, if this is a Taft amendment type, the
2179 -- incomplete declaration is irrelevant, and we want to link the
2180 -- eventual full declaration with the original private one so we
2181 -- also skip the exchange.
2183 Id
:= First_Entity
(P
);
2184 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2185 if Is_Private_Base_Type
(Id
)
2186 and then Present
(Full_View
(Id
))
2187 and then Comes_From_Source
(Full_View
(Id
))
2188 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
2189 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
2191 -- If there is a use-type clause on the private type, set the full
2192 -- view accordingly.
2194 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
2195 Full
:= Full_View
(Id
);
2197 if Is_Private_Base_Type
(Full
)
2198 and then Has_Private_Declaration
(Full
)
2199 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
2200 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
2201 and then In_Package_Body
(Current_Scope
)
2202 and then not Is_Private_Type
(Etype
(Full
))
2204 -- This is the completion of a private type by a derivation
2205 -- from another private type which is not private anymore. This
2206 -- can only happen in a package nested within a child package,
2207 -- when the parent type is defined in the parent unit. At this
2208 -- point the current type is not private either, and we have
2209 -- to install the underlying full view, which is now visible.
2210 -- Save the current full view as well, so that all views can be
2211 -- restored on exit. It may seem that after compiling the child
2212 -- body there are not environments to restore, but the back-end
2213 -- expects those links to be valid, and freeze nodes depend on
2216 if No
(Full_View
(Full
))
2217 and then Present
(Underlying_Full_View
(Full
))
2219 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
2220 Set_Underlying_Full_View
(Id
, Full
);
2222 Set_Underlying_Full_View
(Full
, Empty
);
2223 Set_Is_Frozen
(Full_View
(Id
));
2227 Priv_Deps
:= Private_Dependents
(Id
);
2228 Exchange_Declarations
(Id
);
2229 Set_Is_Immediately_Visible
(Id
);
2230 Swap_Private_Dependents
(Priv_Deps
);
2236 -- Next make other declarations in the private part visible as well
2238 Id
:= First_Private_Entity
(P
);
2239 while Present
(Id
) loop
2240 Install_Package_Entity
(Id
);
2241 Set_Is_Hidden
(Id
, False);
2245 -- Indicate that the private part is currently visible, so it can be
2246 -- properly reset on exit.
2248 Set_In_Private_Part
(P
);
2249 end Install_Private_Declarations
;
2251 ----------------------------------
2252 -- Install_Visible_Declarations --
2253 ----------------------------------
2255 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
2257 Last_Entity
: Entity_Id
;
2261 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
2263 if Is_Package_Or_Generic_Package
(P
) then
2264 Last_Entity
:= First_Private_Entity
(P
);
2266 Last_Entity
:= Empty
;
2269 Id
:= First_Entity
(P
);
2270 while Present
(Id
) and then Id
/= Last_Entity
loop
2271 Install_Package_Entity
(Id
);
2274 end Install_Visible_Declarations
;
2276 --------------------------
2277 -- Is_Private_Base_Type --
2278 --------------------------
2280 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
2282 return Ekind
(E
) = E_Private_Type
2283 or else Ekind
(E
) = E_Limited_Private_Type
2284 or else Ekind
(E
) = E_Record_Type_With_Private
;
2285 end Is_Private_Base_Type
;
2287 --------------------------
2288 -- Is_Visible_Dependent --
2289 --------------------------
2291 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
2293 S
: constant Entity_Id
:= Scope
(Dep
);
2296 -- Renamings created for actual types have the visibility of the actual
2298 if Ekind
(S
) = E_Package
2299 and then Is_Generic_Instance
(S
)
2300 and then (Is_Generic_Actual_Type
(Dep
)
2301 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
2305 elsif not (Is_Derived_Type
(Dep
))
2306 and then Is_Derived_Type
(Full_View
(Dep
))
2308 -- When instantiating a package body, the scope stack is empty, so
2309 -- check instead whether the dependent type is defined in the same
2310 -- scope as the instance itself.
2312 return In_Open_Scopes
(S
)
2313 or else (Is_Generic_Instance
(Current_Scope
)
2314 and then Scope
(Dep
) = Scope
(Current_Scope
));
2318 end Is_Visible_Dependent
;
2320 ----------------------------
2321 -- May_Need_Implicit_Body --
2322 ----------------------------
2324 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
2325 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
2326 S
: constant Node_Id
:= Parent
(P
);
2331 if not Has_Completion
(E
)
2332 and then Nkind
(P
) = N_Package_Declaration
2333 and then (Present
(Activation_Chain_Entity
(P
)) or else Has_RACW
(E
))
2336 Make_Package_Body
(Sloc
(E
),
2337 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
2338 Chars
=> Chars
(E
)),
2339 Declarations
=> New_List
);
2341 if Nkind
(S
) = N_Package_Specification
then
2342 if Present
(Private_Declarations
(S
)) then
2343 Decls
:= Private_Declarations
(S
);
2345 Decls
:= Visible_Declarations
(S
);
2348 Decls
:= Declarations
(S
);
2354 end May_Need_Implicit_Body
;
2356 ----------------------
2357 -- New_Private_Type --
2358 ----------------------
2360 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
2362 -- For other than Ada 2012, enter the name in the current scope
2364 if Ada_Version
< Ada_2012
then
2367 -- Ada 2012 (AI05-0162): Enter the name in the current scope. Note that
2368 -- there may be an incomplete previous view.
2374 Prev
:= Find_Type_Name
(N
);
2375 pragma Assert
(Prev
= Id
2376 or else (Ekind
(Prev
) = E_Incomplete_Type
2377 and then Present
(Full_View
(Prev
))
2378 and then Full_View
(Prev
) = Id
));
2382 if Limited_Present
(Def
) then
2383 Set_Ekind
(Id
, E_Limited_Private_Type
);
2385 Set_Ekind
(Id
, E_Private_Type
);
2389 Set_Has_Delayed_Freeze
(Id
);
2390 Set_Is_First_Subtype
(Id
);
2391 Init_Size_Align
(Id
);
2393 Set_Is_Constrained
(Id
,
2394 No
(Discriminant_Specifications
(N
))
2395 and then not Unknown_Discriminants_Present
(N
));
2397 -- Set tagged flag before processing discriminants, to catch illegal
2400 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
2402 Set_Discriminant_Constraint
(Id
, No_Elist
);
2403 Set_Stored_Constraint
(Id
, No_Elist
);
2405 if Present
(Discriminant_Specifications
(N
)) then
2407 Process_Discriminants
(N
);
2410 elsif Unknown_Discriminants_Present
(N
) then
2411 Set_Has_Unknown_Discriminants
(Id
);
2414 Set_Private_Dependents
(Id
, New_Elmt_List
);
2416 if Tagged_Present
(Def
) then
2417 Set_Ekind
(Id
, E_Record_Type_With_Private
);
2418 Set_Direct_Primitive_Operations
(Id
, New_Elmt_List
);
2419 Set_Is_Abstract_Type
(Id
, Abstract_Present
(Def
));
2420 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
2421 Set_Has_Delayed_Freeze
(Id
, True);
2423 -- Create a class-wide type with the same attributes
2425 Make_Class_Wide_Type
(Id
);
2427 elsif Abstract_Present
(Def
) then
2428 Error_Msg_N
("only a tagged type can be abstract", N
);
2430 end New_Private_Type
;
2432 ---------------------------------
2433 -- Requires_Completion_In_Body --
2434 ---------------------------------
2436 function Requires_Completion_In_Body
2438 Pack_Id
: Entity_Id
) return Boolean
2441 -- Always ignore child units. Child units get added to the entity list
2442 -- of a parent unit, but are not original entities of the parent, and
2443 -- so do not affect whether the parent needs a body.
2445 if Is_Child_Unit
(Id
) then
2448 -- Ignore formal packages and their renamings
2450 elsif Ekind
(Id
) = E_Package
2451 and then Nkind
(Original_Node
(Unit_Declaration_Node
(Id
))) =
2452 N_Formal_Package_Declaration
2456 -- Otherwise test to see if entity requires a completion. Note that
2457 -- subprogram entities whose declaration does not come from source are
2458 -- ignored here on the basis that we assume the expander will provide an
2459 -- implicit completion at some point.
2461 elsif (Is_Overloadable
(Id
)
2462 and then Ekind
(Id
) /= E_Enumeration_Literal
2463 and then Ekind
(Id
) /= E_Operator
2464 and then not Is_Abstract_Subprogram
(Id
)
2465 and then not Has_Completion
(Id
)
2466 and then Comes_From_Source
(Parent
(Id
)))
2469 (Ekind
(Id
) = E_Package
2470 and then Id
/= Pack_Id
2471 and then not Has_Completion
(Id
)
2472 and then Unit_Requires_Body
(Id
))
2475 (Ekind
(Id
) = E_Incomplete_Type
2476 and then No
(Full_View
(Id
))
2477 and then not Is_Generic_Type
(Id
))
2480 (Ekind_In
(Id
, E_Task_Type
, E_Protected_Type
)
2481 and then not Has_Completion
(Id
))
2484 (Ekind
(Id
) = E_Generic_Package
2485 and then Id
/= Pack_Id
2486 and then not Has_Completion
(Id
)
2487 and then Unit_Requires_Body
(Id
))
2490 (Is_Generic_Subprogram
(Id
)
2491 and then not Has_Completion
(Id
))
2496 -- Otherwise the entity does not require completion in a package body
2501 end Requires_Completion_In_Body
;
2503 ----------------------------
2504 -- Uninstall_Declarations --
2505 ----------------------------
2507 procedure Uninstall_Declarations
(P
: Entity_Id
) is
2508 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
2511 Priv_Elmt
: Elmt_Id
;
2512 Priv_Sub
: Entity_Id
;
2514 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
2515 -- Copy to the private declaration the attributes of the full view that
2516 -- need to be available for the partial view also.
2518 function Type_In_Use
(T
: Entity_Id
) return Boolean;
2519 -- Check whether type or base type appear in an active use_type clause
2521 ------------------------------
2522 -- Preserve_Full_Attributes --
2523 ------------------------------
2525 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
2526 Priv_Is_Base_Type
: constant Boolean := Is_Base_Type
(Priv
);
2529 Set_Size_Info
(Priv
, (Full
));
2530 Set_RM_Size
(Priv
, RM_Size
(Full
));
2531 Set_Size_Known_At_Compile_Time
2532 (Priv
, Size_Known_At_Compile_Time
(Full
));
2533 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
2534 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
2535 Set_Is_Ada_2005_Only
(Priv
, Is_Ada_2005_Only
(Full
));
2536 Set_Is_Ada_2012_Only
(Priv
, Is_Ada_2012_Only
(Full
));
2537 Set_Has_Pragma_Unmodified
(Priv
, Has_Pragma_Unmodified
(Full
));
2538 Set_Has_Pragma_Unreferenced
(Priv
, Has_Pragma_Unreferenced
(Full
));
2539 Set_Has_Pragma_Unreferenced_Objects
2540 (Priv
, Has_Pragma_Unreferenced_Objects
2542 if Is_Unchecked_Union
(Full
) then
2543 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
2545 -- Why is atomic not copied here ???
2547 if Referenced
(Full
) then
2548 Set_Referenced
(Priv
);
2551 if Priv_Is_Base_Type
then
2552 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
2553 Set_Finalize_Storage_Only
2554 (Priv
, Finalize_Storage_Only
2555 (Base_Type
(Full
)));
2556 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
2557 Set_Has_Protected
(Priv
, Has_Protected
(Base_Type
(Full
)));
2558 Set_Has_Controlled_Component
2559 (Priv
, Has_Controlled_Component
2560 (Base_Type
(Full
)));
2563 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
2565 -- Propagate information of type invariants, which may be specified
2566 -- for the full view.
2568 if Has_Invariants
(Full
) and not Has_Invariants
(Priv
) then
2569 Set_Has_Invariants
(Priv
);
2570 Set_Subprograms_For_Type
(Priv
, Subprograms_For_Type
(Full
));
2573 if Is_Tagged_Type
(Priv
)
2574 and then Is_Tagged_Type
(Full
)
2575 and then not Error_Posted
(Full
)
2577 if Is_Tagged_Type
(Priv
) then
2579 -- If the type is tagged, the tag itself must be available on
2580 -- the partial view, for expansion purposes.
2582 Set_First_Entity
(Priv
, First_Entity
(Full
));
2584 -- If there are discriminants in the partial view, these remain
2585 -- visible. Otherwise only the tag itself is visible, and there
2586 -- are no nameable components in the partial view.
2588 if No
(Last_Entity
(Priv
)) then
2589 Set_Last_Entity
(Priv
, First_Entity
(Priv
));
2593 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
2595 if Has_Discriminants
(Full
) then
2596 Set_Discriminant_Constraint
(Priv
,
2597 Discriminant_Constraint
(Full
));
2600 end Preserve_Full_Attributes
;
2606 function Type_In_Use
(T
: Entity_Id
) return Boolean is
2608 return Scope
(Base_Type
(T
)) = P
2609 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
2612 -- Start of processing for Uninstall_Declarations
2615 Id
:= First_Entity
(P
);
2616 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2617 if Debug_Flag_E
then
2618 Write_Str
("unlinking visible entity ");
2619 Write_Int
(Int
(Id
));
2623 -- On exit from the package scope, we must preserve the visibility
2624 -- established by use clauses in the current scope. Two cases:
2626 -- a) If the entity is an operator, it may be a primitive operator of
2627 -- a type for which there is a visible use-type clause.
2629 -- b) for other entities, their use-visibility is determined by a
2630 -- visible use clause for the package itself. For a generic instance,
2631 -- the instantiation of the formals appears in the visible part,
2632 -- but the formals are private and remain so.
2634 if Ekind
(Id
) = E_Function
2635 and then Is_Operator_Symbol_Name
(Chars
(Id
))
2636 and then not Is_Hidden
(Id
)
2637 and then not Error_Posted
(Id
)
2639 Set_Is_Potentially_Use_Visible
(Id
,
2641 or else Type_In_Use
(Etype
(Id
))
2642 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
2643 or else (Present
(Next_Formal
(First_Formal
(Id
)))
2646 (Etype
(Next_Formal
(First_Formal
(Id
))))));
2648 if In_Use
(P
) and then not Is_Hidden
(Id
) then
2650 -- A child unit of a use-visible package remains use-visible
2651 -- only if it is itself a visible child unit. Otherwise it
2652 -- would remain visible in other contexts where P is use-
2653 -- visible, because once compiled it stays in the entity list
2654 -- of its parent unit.
2656 if Is_Child_Unit
(Id
) then
2657 Set_Is_Potentially_Use_Visible
2658 (Id
, Is_Visible_Lib_Unit
(Id
));
2660 Set_Is_Potentially_Use_Visible
(Id
);
2664 Set_Is_Potentially_Use_Visible
(Id
, False);
2668 -- Local entities are not immediately visible outside of the package
2670 Set_Is_Immediately_Visible
(Id
, False);
2672 -- If this is a private type with a full view (for example a local
2673 -- subtype of a private type declared elsewhere), ensure that the
2674 -- full view is also removed from visibility: it may be exposed when
2675 -- swapping views in an instantiation. Similarly, ensure that the
2676 -- use-visibility is properly set on both views.
2678 if Is_Type
(Id
) and then Present
(Full_View
(Id
)) then
2679 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
2680 Set_Is_Potentially_Use_Visible
(Full_View
(Id
),
2681 Is_Potentially_Use_Visible
(Id
));
2684 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2685 Check_Abstract_Overriding
(Id
);
2686 Check_Conventions
(Id
);
2689 if Ekind_In
(Id
, E_Private_Type
, E_Limited_Private_Type
)
2690 and then No
(Full_View
(Id
))
2691 and then not Is_Generic_Type
(Id
)
2692 and then not Is_Derived_Type
(Id
)
2694 Error_Msg_N
("missing full declaration for private type&", Id
);
2696 elsif Ekind
(Id
) = E_Record_Type_With_Private
2697 and then not Is_Generic_Type
(Id
)
2698 and then No
(Full_View
(Id
))
2700 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
2701 Error_Msg_N
("missing full declaration for private type&", Id
);
2704 ("missing full declaration for private extension", Id
);
2707 -- Case of constant, check for deferred constant declaration with
2708 -- no full view. Likely just a matter of a missing expression, or
2709 -- accidental use of the keyword constant.
2711 elsif Ekind
(Id
) = E_Constant
2713 -- OK if constant value present
2715 and then No
(Constant_Value
(Id
))
2717 -- OK if full view present
2719 and then No
(Full_View
(Id
))
2721 -- OK if imported, since that provides the completion
2723 and then not Is_Imported
(Id
)
2725 -- OK if object declaration replaced by renaming declaration as
2726 -- a result of OK_To_Rename processing (e.g. for concatenation)
2728 and then Nkind
(Parent
(Id
)) /= N_Object_Renaming_Declaration
2730 -- OK if object declaration with the No_Initialization flag set
2732 and then not (Nkind
(Parent
(Id
)) = N_Object_Declaration
2733 and then No_Initialization
(Parent
(Id
)))
2735 -- If no private declaration is present, we assume the user did
2736 -- not intend a deferred constant declaration and the problem
2737 -- is simply that the initializing expression is missing.
2739 if not Has_Private_Declaration
(Etype
(Id
)) then
2741 -- We assume that the user did not intend a deferred constant
2742 -- declaration, and the expression is just missing.
2745 ("constant declaration requires initialization expression",
2748 if Is_Limited_Type
(Etype
(Id
)) then
2750 ("\if variable intended, remove CONSTANT from declaration",
2754 -- Otherwise if a private declaration is present, then we are
2755 -- missing the full declaration for the deferred constant.
2759 ("missing full declaration for deferred constant (RM 7.4)",
2762 if Is_Limited_Type
(Etype
(Id
)) then
2764 ("\if variable intended, remove CONSTANT from declaration",
2773 -- If the specification was installed as the parent of a public child
2774 -- unit, the private declarations were not installed, and there is
2777 if not In_Private_Part
(P
) then
2780 Set_In_Private_Part
(P
, False);
2783 -- Make private entities invisible and exchange full and private
2784 -- declarations for private types. Id is now the first private entity
2787 while Present
(Id
) loop
2788 if Debug_Flag_E
then
2789 Write_Str
("unlinking private entity ");
2790 Write_Int
(Int
(Id
));
2794 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2795 Check_Abstract_Overriding
(Id
);
2796 Check_Conventions
(Id
);
2799 Set_Is_Immediately_Visible
(Id
, False);
2801 if Is_Private_Base_Type
(Id
) and then Present
(Full_View
(Id
)) then
2802 Full
:= Full_View
(Id
);
2804 -- If the partial view is not declared in the visible part of the
2805 -- package (as is the case when it is a type derived from some
2806 -- other private type in the private part of the current package),
2807 -- no exchange takes place.
2810 or else List_Containing
(Parent
(Id
)) /=
2811 Visible_Declarations
(Specification
(Decl
))
2816 -- The entry in the private part points to the full declaration,
2817 -- which is currently visible. Exchange them so only the private
2818 -- type declaration remains accessible, and link private and full
2819 -- declaration in the opposite direction. Before the actual
2820 -- exchange, we copy back attributes of the full view that must
2821 -- be available to the partial view too.
2823 Preserve_Full_Attributes
(Id
, Full
);
2825 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
2827 -- The following test may be redundant, as this is already
2828 -- diagnosed in sem_ch3. ???
2830 if not Is_Definite_Subtype
(Full
)
2831 and then Is_Definite_Subtype
(Id
)
2833 Error_Msg_Sloc
:= Sloc
(Parent
(Id
));
2835 ("full view of& not compatible with declaration#", Full
, Id
);
2838 -- Swap out the subtypes and derived types of Id that
2839 -- were compiled in this scope, or installed previously
2840 -- by Install_Private_Declarations.
2842 -- Before we do the swap, we verify the presence of the Full_View
2843 -- field which may be empty due to a swap by a previous call to
2844 -- End_Package_Scope (e.g. from the freezing mechanism).
2846 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2847 while Present
(Priv_Elmt
) loop
2848 Priv_Sub
:= Node
(Priv_Elmt
);
2850 if Present
(Full_View
(Priv_Sub
)) then
2851 if Scope
(Priv_Sub
) = P
2852 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
2854 Set_Is_Immediately_Visible
(Priv_Sub
, False);
2857 if Is_Visible_Dependent
(Priv_Sub
) then
2858 Preserve_Full_Attributes
2859 (Priv_Sub
, Full_View
(Priv_Sub
));
2860 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
2861 Exchange_Declarations
(Priv_Sub
);
2865 Next_Elmt
(Priv_Elmt
);
2868 -- Now restore the type itself to its private view
2870 Exchange_Declarations
(Id
);
2872 -- If we have installed an underlying full view for a type derived
2873 -- from a private type in a child unit, restore the proper views
2874 -- of private and full view. See corresponding code in
2875 -- Install_Private_Declarations.
2877 -- After the exchange, Full denotes the private type in the
2878 -- visible part of the package.
2880 if Is_Private_Base_Type
(Full
)
2881 and then Present
(Full_View
(Full
))
2882 and then Present
(Underlying_Full_View
(Full
))
2883 and then In_Package_Body
(Current_Scope
)
2885 Set_Full_View
(Full
, Underlying_Full_View
(Full
));
2886 Set_Underlying_Full_View
(Full
, Empty
);
2889 elsif Ekind
(Id
) = E_Incomplete_Type
2890 and then Comes_From_Source
(Id
)
2891 and then No
(Full_View
(Id
))
2893 -- Mark Taft amendment types. Verify that there are no primitive
2894 -- operations declared for the type (3.10.1(9)).
2896 Set_Has_Completion_In_Body
(Id
);
2903 Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2904 while Present
(Elmt
) loop
2905 Subp
:= Node
(Elmt
);
2907 -- Is_Primitive is tested because there can be cases where
2908 -- nonprimitive subprograms (in nested packages) are added
2909 -- to the Private_Dependents list.
2911 if Is_Overloadable
(Subp
) and then Is_Primitive
(Subp
) then
2913 ("type& must be completed in the private part",
2916 -- The result type of an access-to-function type cannot be a
2917 -- Taft-amendment type, unless the version is Ada 2012 or
2918 -- later (see AI05-151).
2920 elsif Ada_Version
< Ada_2012
2921 and then Ekind
(Subp
) = E_Subprogram_Type
2923 if Etype
(Subp
) = Id
2925 (Is_Class_Wide_Type
(Etype
(Subp
))
2926 and then Etype
(Etype
(Subp
)) = Id
)
2929 ("type& must be completed in the private part",
2930 Associated_Node_For_Itype
(Subp
), Id
);
2938 elsif not Is_Child_Unit
(Id
)
2939 and then (not Is_Private_Type
(Id
) or else No
(Full_View
(Id
)))
2942 Set_Is_Potentially_Use_Visible
(Id
, False);
2948 end Uninstall_Declarations
;
2950 ------------------------
2951 -- Unit_Requires_Body --
2952 ------------------------
2954 function Unit_Requires_Body
2955 (Pack_Id
: Entity_Id
;
2956 Ignore_Abstract_State
: Boolean := False) return Boolean
2961 -- Imported entity never requires body. Right now, only subprograms can
2962 -- be imported, but perhaps in the future we will allow import of
2965 if Is_Imported
(Pack_Id
) then
2968 -- Body required if library package with pragma Elaborate_Body
2970 elsif Has_Pragma_Elaborate_Body
(Pack_Id
) then
2973 -- Body required if subprogram
2975 elsif Is_Subprogram_Or_Generic_Subprogram
(Pack_Id
) then
2978 -- Treat a block as requiring a body
2980 elsif Ekind
(Pack_Id
) = E_Block
then
2983 elsif Ekind
(Pack_Id
) = E_Package
2984 and then Nkind
(Parent
(Pack_Id
)) = N_Package_Specification
2985 and then Present
(Generic_Parent
(Parent
(Pack_Id
)))
2988 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(Pack_Id
));
2990 if Has_Pragma_Elaborate_Body
(G_P
) then
2995 -- A [generic] package that introduces at least one non-null abstract
2996 -- state requires completion. However, there is a separate rule that
2997 -- requires that such a package have a reason other than this for a
2998 -- body being required (if necessary a pragma Elaborate_Body must be
2999 -- provided). If Ignore_Abstract_State is True, we don't do this check
3000 -- (so we can use Unit_Requires_Body to check for some other reason).
3002 elsif Ekind_In
(Pack_Id
, E_Generic_Package
, E_Package
)
3003 and then not Ignore_Abstract_State
3004 and then Present
(Abstract_States
(Pack_Id
))
3005 and then not Is_Null_State
3006 (Node
(First_Elmt
(Abstract_States
(Pack_Id
))))
3011 -- Otherwise search entity chain for entity requiring completion
3013 E
:= First_Entity
(Pack_Id
);
3014 while Present
(E
) loop
3015 if Requires_Completion_In_Body
(E
, Pack_Id
) then
3023 end Unit_Requires_Body
;
3025 -----------------------------
3026 -- Unit_Requires_Body_Info --
3027 -----------------------------
3029 procedure Unit_Requires_Body_Info
(Pack_Id
: Entity_Id
) is
3033 -- An imported entity never requires body. Right now, only subprograms
3034 -- can be imported, but perhaps in the future we will allow import of
3037 if Is_Imported
(Pack_Id
) then
3040 -- Body required if library package with pragma Elaborate_Body
3042 elsif Has_Pragma_Elaborate_Body
(Pack_Id
) then
3043 Error_Msg_N
("info: & requires body (Elaborate_Body)?Y?", Pack_Id
);
3045 -- Body required if subprogram
3047 elsif Is_Subprogram_Or_Generic_Subprogram
(Pack_Id
) then
3048 Error_Msg_N
("info: & requires body (subprogram case)?Y?", Pack_Id
);
3050 -- Body required if generic parent has Elaborate_Body
3052 elsif Ekind
(Pack_Id
) = E_Package
3053 and then Nkind
(Parent
(Pack_Id
)) = N_Package_Specification
3054 and then Present
(Generic_Parent
(Parent
(Pack_Id
)))
3057 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(Pack_Id
));
3059 if Has_Pragma_Elaborate_Body
(G_P
) then
3061 ("info: & requires body (generic parent Elaborate_Body)?Y?",
3066 -- A [generic] package that introduces at least one non-null abstract
3067 -- state requires completion. However, there is a separate rule that
3068 -- requires that such a package have a reason other than this for a
3069 -- body being required (if necessary a pragma Elaborate_Body must be
3070 -- provided). If Ignore_Abstract_State is True, we don't do this check
3071 -- (so we can use Unit_Requires_Body to check for some other reason).
3073 elsif Ekind_In
(Pack_Id
, E_Generic_Package
, E_Package
)
3074 and then Present
(Abstract_States
(Pack_Id
))
3075 and then not Is_Null_State
3076 (Node
(First_Elmt
(Abstract_States
(Pack_Id
))))
3079 ("info: & requires body (non-null abstract state aspect)?Y?",
3083 -- Otherwise search entity chain for entity requiring completion
3085 E
:= First_Entity
(Pack_Id
);
3086 while Present
(E
) loop
3087 if Requires_Completion_In_Body
(E
, Pack_Id
) then
3088 Error_Msg_Node_2
:= E
;
3090 ("info: & requires body (& requires completion)?Y?", E
, Pack_Id
);
3095 end Unit_Requires_Body_Info
;