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 Debug
; use Debug
;
34 with Einfo
; use Einfo
;
35 with Elists
; use Elists
;
36 with Errout
; use Errout
;
37 with Exp_Disp
; use Exp_Disp
;
38 with Exp_Dist
; use Exp_Dist
;
39 with Exp_Dbug
; use Exp_Dbug
;
40 with Ghost
; use Ghost
;
42 with Lib
.Xref
; use Lib
.Xref
;
43 with Namet
; use Namet
;
44 with Nmake
; use Nmake
;
45 with Nlists
; use Nlists
;
47 with Output
; use Output
;
48 with Restrict
; use Restrict
;
50 with Sem_Aux
; use Sem_Aux
;
51 with Sem_Cat
; use Sem_Cat
;
52 with Sem_Ch3
; use Sem_Ch3
;
53 with Sem_Ch6
; use Sem_Ch6
;
54 with Sem_Ch8
; use Sem_Ch8
;
55 with Sem_Ch10
; use Sem_Ch10
;
56 with Sem_Ch12
; use Sem_Ch12
;
57 with Sem_Ch13
; use Sem_Ch13
;
58 with Sem_Disp
; use Sem_Disp
;
59 with Sem_Eval
; use Sem_Eval
;
60 with Sem_Prag
; use Sem_Prag
;
61 with Sem_Util
; use Sem_Util
;
62 with Sem_Warn
; use Sem_Warn
;
63 with Snames
; use Snames
;
64 with Stand
; use Stand
;
65 with Sinfo
; use Sinfo
;
66 with Sinput
; use Sinput
;
68 with Uintp
; use Uintp
;
70 package body Sem_Ch7
is
72 -----------------------------------
73 -- Handling private declarations --
74 -----------------------------------
76 -- The principle that each entity has a single defining occurrence clashes
77 -- with the presence of two separate definitions for private types: the
78 -- first is the private type declaration, and the second is the full type
79 -- declaration. It is important that all references to the type point to
80 -- the same defining occurrence, namely the first one. To enforce the two
81 -- separate views of the entity, the corresponding information is swapped
82 -- between the two declarations. Outside of the package, the defining
83 -- occurrence only contains the private declaration information, while in
84 -- the private part and the body of the package the defining occurrence
85 -- contains the full declaration. To simplify the swap, the defining
86 -- occurrence that currently holds the private declaration points to the
87 -- full declaration. During semantic processing the defining occurrence
88 -- also points to a list of private dependents, that is to say access types
89 -- or composite types whose designated types or component types are
90 -- subtypes or derived types of the private type in question. After the
91 -- full declaration has been seen, the private dependents are updated to
92 -- indicate that they have full definitions.
94 -----------------------
95 -- Local Subprograms --
96 -----------------------
98 procedure Analyze_Package_Body_Helper
(N
: Node_Id
);
99 -- Does all the real work of Analyze_Package_Body
101 procedure Check_Anonymous_Access_Types
102 (Spec_Id
: Entity_Id
;
104 -- If the spec of a package has a limited_with_clause, it may declare
105 -- anonymous access types whose designated type is a limited view, such an
106 -- anonymous access return type for a function. This access type cannot be
107 -- elaborated in the spec itself, but it may need an itype reference if it
108 -- is used within a nested scope. In that case the itype reference is
109 -- created at the beginning of the corresponding package body and inserted
110 -- before other body declarations.
112 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
113 -- Called upon entering the private part of a public child package and the
114 -- body of a nested package, to potentially declare certain inherited
115 -- subprograms that were inherited by types in the visible part, but whose
116 -- declaration was deferred because the parent operation was private and
117 -- not visible at that point. These subprograms are located by traversing
118 -- the visible part declarations looking for non-private type extensions
119 -- and then examining each of the primitive operations of such types to
120 -- find those that were inherited but declared with a special internal
121 -- name. Each such operation is now declared as an operation with a normal
122 -- name (using the name of the parent operation) and replaces the previous
123 -- implicit operation in the primitive operations list of the type. If the
124 -- inherited private operation has been overridden, then it's replaced by
125 -- the overriding operation.
127 procedure Install_Package_Entity
(Id
: Entity_Id
);
128 -- Supporting procedure for Install_{Visible,Private}_Declarations. Places
129 -- one entity on its visibility chain, and recurses on the visible part if
130 -- the entity is an inner package.
132 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
133 -- True for a private type that is not a subtype
135 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
136 -- If the private dependent is a private type whose full view is derived
137 -- from the parent type, its full properties are revealed only if we are in
138 -- the immediate scope of the private dependent. Should this predicate be
139 -- tightened further???
141 function Requires_Completion_In_Body
143 Pack_Id
: Entity_Id
) return Boolean;
144 -- Subsidiary to routines Unit_Requires_Body and Unit_Requires_Body_Info.
145 -- Determine whether entity Id declared in package spec Pack_Id requires
146 -- completion in a package body.
148 procedure Unit_Requires_Body_Info
(Pack_Id
: Entity_Id
);
149 -- Outputs info messages showing why package Pack_Id requires a body. The
150 -- caller has checked that the switch requesting this information is set,
151 -- and that the package does indeed require a body.
153 --------------------------
154 -- Analyze_Package_Body --
155 --------------------------
157 procedure Analyze_Package_Body
(N
: Node_Id
) is
158 Loc
: constant Source_Ptr
:= Sloc
(N
);
162 Write_Str
("==> package body ");
163 Write_Name
(Chars
(Defining_Entity
(N
)));
164 Write_Str
(" from ");
165 Write_Location
(Loc
);
170 -- The real work is split out into the helper, so it can do "return;"
171 -- without skipping the debug output.
173 Analyze_Package_Body_Helper
(N
);
177 Write_Str
("<== package body ");
178 Write_Name
(Chars
(Defining_Entity
(N
)));
179 Write_Str
(" from ");
180 Write_Location
(Loc
);
183 end Analyze_Package_Body
;
185 -----------------------------------
186 -- Analyze_Package_Body_Contract --
187 -----------------------------------
189 procedure Analyze_Package_Body_Contract
(Body_Id
: Entity_Id
) is
190 Spec_Id
: constant Entity_Id
:= Spec_Entity
(Body_Id
);
191 Mode
: SPARK_Mode_Type
;
195 -- Due to the timing of contract analysis, delayed pragmas may be
196 -- subject to the wrong SPARK_Mode, usually that of the enclosing
197 -- context. To remedy this, restore the original SPARK_Mode of the
198 -- related package body.
200 Save_SPARK_Mode_And_Set
(Body_Id
, Mode
);
202 Ref_State
:= Get_Pragma
(Body_Id
, Pragma_Refined_State
);
204 -- The analysis of pragma Refined_State detects whether the spec has
205 -- abstract states available for refinement.
207 if Present
(Ref_State
) then
208 Analyze_Refined_State_In_Decl_Part
(Ref_State
);
210 -- State refinement is required when the package declaration defines at
211 -- least one abstract state. Null states are not considered. Refinement
212 -- is not envorced when SPARK checks are turned off.
214 elsif SPARK_Mode
/= Off
215 and then Requires_State_Refinement
(Spec_Id
, Body_Id
)
217 Error_Msg_N
("package & requires state refinement", Spec_Id
);
220 -- Restore the SPARK_Mode of the enclosing context after all delayed
221 -- pragmas have been analyzed.
223 Restore_SPARK_Mode
(Mode
);
224 end Analyze_Package_Body_Contract
;
226 ---------------------------------
227 -- Analyze_Package_Body_Helper --
228 ---------------------------------
230 procedure Analyze_Package_Body_Helper
(N
: Node_Id
) is
231 procedure Hide_Public_Entities
(Decls
: List_Id
);
232 -- Attempt to hide all public entities found in declarative list Decls
233 -- by resetting their Is_Public flag to False depending on whether the
234 -- entities are not referenced by inlined or generic bodies. This kind
235 -- of processing is a conservative approximation and may still leave
236 -- certain entities externally visible.
238 procedure Install_Composite_Operations
(P
: Entity_Id
);
239 -- Composite types declared in the current scope may depend on types
240 -- that were private at the point of declaration, and whose full view
241 -- is now in scope. Indicate that the corresponding operations on the
242 -- composite type are available.
244 --------------------------
245 -- Hide_Public_Entities --
246 --------------------------
248 procedure Hide_Public_Entities
(Decls
: List_Id
) is
249 function Contains_Subp_Or_Const_Refs
(N
: Node_Id
) return Boolean;
250 -- Subsidiary to routine Has_Referencer. Determine whether a node
251 -- contains a reference to a subprogram or a non-static constant.
252 -- WARNING: this is a very expensive routine as it performs a full
255 function Has_Referencer
257 Top_Level
: Boolean := False) return Boolean;
258 -- A "referencer" is a construct which may reference a previous
259 -- declaration. Examine all declarations in list Decls in reverse
260 -- and determine whether once such referencer exists. All entities
261 -- in the range Last (Decls) .. Referencer are hidden from external
264 ---------------------------------
265 -- Contains_Subp_Or_Const_Refs --
266 ---------------------------------
268 function Contains_Subp_Or_Const_Refs
(N
: Node_Id
) return Boolean is
269 Reference_Seen
: Boolean := False;
271 function Is_Subp_Or_Const_Ref
272 (N
: Node_Id
) return Traverse_Result
;
273 -- Determine whether a node denotes a reference to a subprogram or
274 -- a non-static constant.
276 --------------------------
277 -- Is_Subp_Or_Const_Ref --
278 --------------------------
280 function Is_Subp_Or_Const_Ref
281 (N
: Node_Id
) return Traverse_Result
286 -- Detect a reference of the form
289 if Nkind
(N
) in N_Subprogram_Call
290 and then Is_Entity_Name
(Name
(N
))
292 Reference_Seen
:= True;
295 -- Detect a reference of the form
296 -- Subp'Some_Attribute
298 elsif Nkind
(N
) = N_Attribute_Reference
299 and then Is_Entity_Name
(Prefix
(N
))
300 and then Present
(Entity
(Prefix
(N
)))
301 and then Is_Subprogram
(Entity
(Prefix
(N
)))
303 Reference_Seen
:= True;
306 -- Detect the use of a non-static constant
308 elsif Is_Entity_Name
(N
)
309 and then Present
(Entity
(N
))
310 and then Ekind
(Entity
(N
)) = E_Constant
312 Val
:= Constant_Value
(Entity
(N
));
315 and then not Compile_Time_Known_Value
(Val
)
317 Reference_Seen
:= True;
323 end Is_Subp_Or_Const_Ref
;
325 procedure Find_Subp_Or_Const_Ref
is
326 new Traverse_Proc
(Is_Subp_Or_Const_Ref
);
328 -- Start of processing for Contains_Subp_Or_Const_Refs
331 Find_Subp_Or_Const_Ref
(N
);
333 return Reference_Seen
;
334 end Contains_Subp_Or_Const_Refs
;
340 function Has_Referencer
342 Top_Level
: Boolean := False) return Boolean
348 Has_Non_Subp_Const_Referencer
: Boolean := False;
349 -- Flag set for inlined subprogram bodies that do not contain
350 -- references to other subprograms or non-static constants.
357 -- Examine all declarations in reverse order, hiding all entities
358 -- from external visibility until a referencer has been found. The
359 -- algorithm recurses into nested packages.
361 Decl
:= Last
(Decls
);
362 while Present
(Decl
) loop
364 -- A stub is always considered a referencer
366 if Nkind
(Decl
) in N_Body_Stub
then
369 -- Package declaration
371 elsif Nkind
(Decl
) = N_Package_Declaration
372 and then not Has_Non_Subp_Const_Referencer
374 Spec
:= Specification
(Decl
);
376 -- Inspect the declarations of a non-generic package to try
377 -- and hide more entities from external visibility.
379 if not Is_Generic_Unit
(Defining_Entity
(Spec
)) then
380 if Has_Referencer
(Private_Declarations
(Spec
))
381 or else Has_Referencer
(Visible_Declarations
(Spec
))
389 elsif Nkind
(Decl
) = N_Package_Body
390 and then Present
(Corresponding_Spec
(Decl
))
392 Decl_Id
:= Corresponding_Spec
(Decl
);
394 -- A generic package body is a referencer. It would seem
395 -- that we only have to consider generics that can be
396 -- exported, i.e. where the corresponding spec is the
397 -- spec of the current package, but because of nested
398 -- instantiations, a fully private generic body may export
399 -- other private body entities. Furthermore, regardless of
400 -- whether there was a previous inlined subprogram, (an
401 -- instantiation of) the generic package may reference any
402 -- entity declared before it.
404 if Is_Generic_Unit
(Decl_Id
) then
407 -- Inspect the declarations of a non-generic package body to
408 -- try and hide more entities from external visibility.
410 elsif not Has_Non_Subp_Const_Referencer
411 and then Has_Referencer
(Declarations
(Decl
))
418 elsif Nkind
(Decl
) = N_Subprogram_Body
then
419 if Present
(Corresponding_Spec
(Decl
)) then
420 Decl_Id
:= Corresponding_Spec
(Decl
);
422 -- A generic subprogram body acts as a referencer
424 if Is_Generic_Unit
(Decl_Id
) then
428 -- An inlined subprogram body acts as a referencer
430 if Is_Inlined
(Decl_Id
)
431 or else Has_Pragma_Inline
(Decl_Id
)
433 -- Inspect the statements of the subprogram body
434 -- to determine whether the body references other
435 -- subprograms and/or non-static constants.
438 and then not Contains_Subp_Or_Const_Refs
(Decl
)
440 Has_Non_Subp_Const_Referencer
:= True;
446 -- Otherwise this is a stand alone subprogram body
449 Decl_Id
:= Defining_Entity
(Decl
);
451 -- An inlined body acts as a referencer. Note that an
452 -- inlined subprogram remains Is_Public as gigi requires
453 -- the flag to be set.
455 -- Note that we test Has_Pragma_Inline here rather than
456 -- Is_Inlined. We are compiling this for a client, and
457 -- it is the client who will decide if actual inlining
458 -- should occur, so we need to assume that the procedure
459 -- could be inlined for the purpose of accessing global
462 if Has_Pragma_Inline
(Decl_Id
) then
464 and then not Contains_Subp_Or_Const_Refs
(Decl
)
466 Has_Non_Subp_Const_Referencer
:= True;
471 Set_Is_Public
(Decl_Id
, False);
475 -- Exceptions, objects and renamings do not need to be public
476 -- if they are not followed by a construct which can reference
477 -- and export them. The Is_Public flag is reset on top level
478 -- entities only as anything nested is local to its context.
480 elsif Nkind_In
(Decl
, N_Exception_Declaration
,
481 N_Object_Declaration
,
482 N_Object_Renaming_Declaration
,
483 N_Subprogram_Declaration
,
484 N_Subprogram_Renaming_Declaration
)
486 Decl_Id
:= Defining_Entity
(Decl
);
489 and then not Is_Imported
(Decl_Id
)
490 and then not Is_Exported
(Decl_Id
)
491 and then No
(Interface_Name
(Decl_Id
))
493 (not Has_Non_Subp_Const_Referencer
494 or else Nkind
(Decl
) = N_Subprogram_Declaration
)
496 Set_Is_Public
(Decl_Id
, False);
503 return Has_Non_Subp_Const_Referencer
;
508 Discard
: Boolean := True;
509 pragma Unreferenced
(Discard
);
511 -- Start of processing for Hide_Public_Entities
514 -- The algorithm examines the top level declarations of a package
515 -- body in reverse looking for a construct that may export entities
516 -- declared prior to it. If such a scenario is encountered, then all
517 -- entities in the range Last (Decls) .. construct are hidden from
518 -- external visibility. Consider:
526 -- package body Pack is
527 -- External_Obj : ...; -- (1)
529 -- package body Gen is -- (2)
530 -- ... External_Obj ... -- (3)
533 -- Local_Obj : ...; -- (4)
536 -- In this example Local_Obj (4) must not be externally visible as
537 -- it cannot be exported by anything in Pack. The body of generic
538 -- package Gen (2) on the other hand acts as a "referencer" and may
539 -- export anything declared before it. Since the compiler does not
540 -- perform flow analysis, it is not possible to determine precisely
541 -- which entities will be exported when Gen is instantiated. In the
542 -- example above External_Obj (1) is exported at (3), but this may
543 -- not always be the case. The algorithm takes a conservative stance
544 -- and leaves entity External_Obj public.
546 Discard
:= Has_Referencer
(Decls
, Top_Level
=> True);
547 end Hide_Public_Entities
;
549 ----------------------------------
550 -- Install_Composite_Operations --
551 ----------------------------------
553 procedure Install_Composite_Operations
(P
: Entity_Id
) is
557 Id
:= First_Entity
(P
);
558 while Present
(Id
) loop
560 and then (Is_Limited_Composite
(Id
)
561 or else Is_Private_Composite
(Id
))
562 and then No
(Private_Component
(Id
))
564 Set_Is_Limited_Composite
(Id
, False);
565 Set_Is_Private_Composite
(Id
, False);
570 end Install_Composite_Operations
;
574 GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
577 Last_Spec_Entity
: Entity_Id
;
582 -- Start of processing for Analyze_Package_Body_Helper
585 -- Find corresponding package specification, and establish the current
586 -- scope. The visible defining entity for the package is the defining
587 -- occurrence in the spec. On exit from the package body, all body
588 -- declarations are attached to the defining entity for the body, but
589 -- the later is never used for name resolution. In this fashion there
590 -- is only one visible entity that denotes the package.
592 -- Set Body_Id. Note that this will be reset to point to the generic
593 -- copy later on in the generic case.
595 Body_Id
:= Defining_Entity
(N
);
597 -- Body is body of package instantiation. Corresponding spec has already
600 if Present
(Corresponding_Spec
(N
)) then
601 Spec_Id
:= Corresponding_Spec
(N
);
602 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
605 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
608 and then Is_Package_Or_Generic_Package
(Spec_Id
)
610 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
612 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
613 Error_Msg_N
("cannot supply body for package renaming", N
);
616 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
617 Error_Msg_N
("redefinition of package body", N
);
622 Error_Msg_N
("missing specification for package body", N
);
626 if Is_Package_Or_Generic_Package
(Spec_Id
)
627 and then (Scope
(Spec_Id
) = Standard_Standard
628 or else Is_Child_Unit
(Spec_Id
))
629 and then not Unit_Requires_Body
(Spec_Id
)
631 if Ada_Version
= Ada_83
then
633 ("optional package body (not allowed in Ada 95)??", N
);
635 Error_Msg_N
("spec of this package does not allow a body", N
);
640 -- The corresponding spec of the package body may be subject to pragma
641 -- Ghost with policy Ignore. Set the mode now to ensure that any nodes
642 -- generated during analysis and expansion are properly flagged as
645 Set_Ghost_Mode
(N
, Spec_Id
);
647 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
648 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
650 if Is_Child_Unit
(Spec_Id
) then
651 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
653 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
656 Set_Is_Child_Unit
(Body_Id
);
659 -- Generic package case
661 if Ekind
(Spec_Id
) = E_Generic_Package
then
663 -- Disable expansion and perform semantic analysis on copy. The
664 -- unannotated body will be used in all instantiations.
666 Body_Id
:= Defining_Entity
(N
);
667 Set_Ekind
(Body_Id
, E_Package_Body
);
668 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
669 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
670 Set_Body_Entity
(Spec_Id
, Body_Id
);
671 Set_Spec_Entity
(Body_Id
, Spec_Id
);
673 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
676 -- Once the contents of the generic copy and the template are
677 -- swapped, do the same for their respective aspect specifications.
679 Exchange_Aspects
(N
, New_N
);
681 -- Collect all contract-related source pragmas found within the
682 -- template and attach them to the contract of the package body.
683 -- This contract is used in the capture of global references within
686 Create_Generic_Contract
(N
);
688 -- Update Body_Id to point to the copied node for the remainder of
691 Body_Id
:= Defining_Entity
(N
);
695 -- The Body_Id is that of the copied node in the generic case, the
696 -- current node otherwise. Note that N was rewritten above, so we must
697 -- be sure to get the latest Body_Id value.
699 Set_Ekind
(Body_Id
, E_Package_Body
);
700 Set_Body_Entity
(Spec_Id
, Body_Id
);
701 Set_Spec_Entity
(Body_Id
, Spec_Id
);
703 -- Defining name for the package body is not a visible entity: Only the
704 -- defining name for the declaration is visible.
706 Set_Etype
(Body_Id
, Standard_Void_Type
);
707 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
708 Set_Corresponding_Spec
(N
, Spec_Id
);
709 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
711 -- The body entity is not used for semantics or code generation, but
712 -- it is attached to the entity list of the enclosing scope to simplify
713 -- the listing of back-annotations for the types it main contain.
715 if Scope
(Spec_Id
) /= Standard_Standard
then
716 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
719 -- Indicate that we are currently compiling the body of the package
721 Set_In_Package_Body
(Spec_Id
);
722 Set_Has_Completion
(Spec_Id
);
723 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
725 if Has_Aspects
(N
) then
726 Analyze_Aspect_Specifications
(N
, Body_Id
);
729 Push_Scope
(Spec_Id
);
731 -- Set SPARK_Mode only for non-generic package
733 if Ekind
(Spec_Id
) = E_Package
then
735 -- Set SPARK_Mode from context
737 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
738 Set_SPARK_Pragma_Inherited
(Body_Id
, True);
740 -- Set elaboration code SPARK mode the same for now
742 Set_SPARK_Aux_Pragma
(Body_Id
, SPARK_Pragma
(Body_Id
));
743 Set_SPARK_Aux_Pragma_Inherited
(Body_Id
, True);
746 -- Inherit the "ghostness" of the subprogram spec. Note that this
747 -- property is not directly inherited as the body may be subject to a
748 -- different Ghost assertion policy.
750 if Is_Ghost_Entity
(Spec_Id
) or else Ghost_Mode
> None
then
751 Set_Is_Ghost_Entity
(Body_Id
);
753 -- The Ghost policy in effect at the point of declaration and at the
754 -- point of completion must match (SPARK RM 6.9(14)).
756 Check_Ghost_Completion
(Spec_Id
, Body_Id
);
759 Set_Categorization_From_Pragmas
(N
);
761 Install_Visible_Declarations
(Spec_Id
);
762 Install_Private_Declarations
(Spec_Id
);
763 Install_Private_With_Clauses
(Spec_Id
);
764 Install_Composite_Operations
(Spec_Id
);
766 Check_Anonymous_Access_Types
(Spec_Id
, N
);
768 if Ekind
(Spec_Id
) = E_Generic_Package
then
769 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
772 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
773 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
775 -- This is a nested package, so it may be necessary to declare certain
776 -- inherited subprograms that are not yet visible because the parent
777 -- type's subprograms are now visible.
779 if Ekind
(Scope
(Spec_Id
)) = E_Package
780 and then Scope
(Spec_Id
) /= Standard_Standard
782 Declare_Inherited_Private_Subprograms
(Spec_Id
);
785 if Present
(Declarations
(N
)) then
786 Analyze_Declarations
(Declarations
(N
));
787 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
790 -- Verify that the SPARK_Mode of the body agrees with that of its spec
792 if Present
(SPARK_Pragma
(Body_Id
)) then
793 if Present
(SPARK_Aux_Pragma
(Spec_Id
)) then
794 if Get_SPARK_Mode_From_Pragma
(SPARK_Aux_Pragma
(Spec_Id
)) = Off
796 Get_SPARK_Mode_From_Pragma
(SPARK_Pragma
(Body_Id
)) = On
798 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
799 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
800 Error_Msg_Sloc
:= Sloc
(SPARK_Aux_Pragma
(Spec_Id
));
802 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
806 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
807 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
808 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
810 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
814 -- Analyze_Declarations has caused freezing of all types. Now generate
815 -- bodies for RACW primitives and stream attributes, if any.
817 if Ekind
(Spec_Id
) = E_Package
and then Has_RACW
(Spec_Id
) then
819 -- Attach subprogram bodies to support RACWs declared in spec
821 Append_RACW_Bodies
(Declarations
(N
), Spec_Id
);
822 Analyze_List
(Declarations
(N
));
825 HSS
:= Handled_Statement_Sequence
(N
);
827 if Present
(HSS
) then
828 Process_End_Label
(HSS
, 't', Spec_Id
);
831 -- Check that elaboration code in a preelaborable package body is
832 -- empty other than null statements and labels (RM 10.2.1(6)).
834 Validate_Null_Statement_Sequence
(N
);
837 Validate_Categorization_Dependency
(N
, Spec_Id
);
838 Check_Completion
(Body_Id
);
840 -- Generate start of body reference. Note that we do this fairly late,
841 -- because the call will use In_Extended_Main_Source_Unit as a check,
842 -- and we want to make sure that Corresponding_Stub links are set
844 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
846 -- For a generic package, collect global references and mark them on
847 -- the original body so that they are not resolved again at the point
850 if Ekind
(Spec_Id
) /= E_Package
then
851 Save_Global_References
(Original_Node
(N
));
855 -- The entities of the package body have so far been chained onto the
856 -- declaration chain for the spec. That's been fine while we were in the
857 -- body, since we wanted them to be visible, but now that we are leaving
858 -- the package body, they are no longer visible, so we remove them from
859 -- the entity chain of the package spec entity, and copy them to the
860 -- entity chain of the package body entity, where they will never again
863 if Present
(Last_Spec_Entity
) then
864 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
865 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
866 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
867 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
870 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
871 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
872 Set_First_Entity
(Spec_Id
, Empty
);
873 Set_Last_Entity
(Spec_Id
, Empty
);
876 End_Package_Scope
(Spec_Id
);
878 -- All entities declared in body are not visible
884 E
:= First_Entity
(Body_Id
);
885 while Present
(E
) loop
886 Set_Is_Immediately_Visible
(E
, False);
887 Set_Is_Potentially_Use_Visible
(E
, False);
890 -- Child units may appear on the entity list (e.g. if they appear
891 -- in the context of a subunit) but they are not body entities.
893 if not Is_Child_Unit
(E
) then
894 Set_Is_Package_Body_Entity
(E
);
901 Check_References
(Body_Id
);
903 -- For a generic unit, check that the formal parameters are referenced,
904 -- and that local variables are used, as for regular packages.
906 if Ekind
(Spec_Id
) = E_Generic_Package
then
907 Check_References
(Spec_Id
);
910 -- At this point all entities of the package body are externally visible
911 -- to the linker as their Is_Public flag is set to True. This proactive
912 -- approach is necessary because an inlined or a generic body for which
913 -- code is generated in other units may need to see these entities. Cut
914 -- down the number of global symbols that do not neet public visibility
915 -- as this has two beneficial effects:
916 -- (1) It makes the compilation process more efficient.
917 -- (2) It gives the code generatormore freedom to optimize within each
918 -- unit, especially subprograms.
920 -- This is done only for top level library packages or child units as
921 -- the algorithm does a top down traversal of the package body.
923 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
924 and then not Is_Generic_Unit
(Spec_Id
)
926 Hide_Public_Entities
(Declarations
(N
));
929 -- If expander is not active, then here is where we turn off the
930 -- In_Package_Body flag, otherwise it is turned off at the end of the
931 -- corresponding expansion routine. If this is an instance body, we need
932 -- to qualify names of local entities, because the body may have been
933 -- compiled as a preliminary to another instantiation.
935 if not Expander_Active
then
936 Set_In_Package_Body
(Spec_Id
, False);
938 if Is_Generic_Instance
(Spec_Id
)
939 and then Operating_Mode
= Generate_Code
941 Qualify_Entity_Names
(N
);
945 -- Restore the original Ghost mode once analysis and expansion have
949 end Analyze_Package_Body_Helper
;
951 ------------------------------
952 -- Analyze_Package_Contract --
953 ------------------------------
955 procedure Analyze_Package_Contract
(Pack_Id
: Entity_Id
) is
956 Items
: constant Node_Id
:= Contract
(Pack_Id
);
957 Init
: Node_Id
:= Empty
;
958 Init_Cond
: Node_Id
:= Empty
;
959 Mode
: SPARK_Mode_Type
;
964 -- Due to the timing of contract analysis, delayed pragmas may be
965 -- subject to the wrong SPARK_Mode, usually that of the enclosing
966 -- context. To remedy this, restore the original SPARK_Mode of the
969 Save_SPARK_Mode_And_Set
(Pack_Id
, Mode
);
971 if Present
(Items
) then
973 -- Locate and store pragmas Initial_Condition and Initializes since
974 -- their order of analysis matters.
976 Prag
:= Classifications
(Items
);
977 while Present
(Prag
) loop
978 Prag_Nam
:= Pragma_Name
(Prag
);
980 if Prag_Nam
= Name_Initial_Condition
then
983 elsif Prag_Nam
= Name_Initializes
then
987 Prag
:= Next_Pragma
(Prag
);
990 -- Analyze the initialization related pragmas. Initializes must come
991 -- before Initial_Condition due to item dependencies.
993 if Present
(Init
) then
994 Analyze_Initializes_In_Decl_Part
(Init
);
997 if Present
(Init_Cond
) then
998 Analyze_Initial_Condition_In_Decl_Part
(Init_Cond
);
1002 -- Check whether the lack of indicator Part_Of agrees with the placement
1003 -- of the package instantiation with respect to the state space.
1005 if Is_Generic_Instance
(Pack_Id
) then
1006 Prag
:= Get_Pragma
(Pack_Id
, Pragma_Part_Of
);
1009 Check_Missing_Part_Of
(Pack_Id
);
1013 -- Restore the SPARK_Mode of the enclosing context after all delayed
1014 -- pragmas have been analyzed.
1016 Restore_SPARK_Mode
(Mode
);
1017 end Analyze_Package_Contract
;
1019 ---------------------------------
1020 -- Analyze_Package_Declaration --
1021 ---------------------------------
1023 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
1024 GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
1026 procedure Restore_Globals
;
1027 -- Restore the values of all saved global variables
1029 ---------------------
1030 -- Restore_Globals --
1031 ---------------------
1033 procedure Restore_Globals
is
1036 end Restore_Globals
;
1040 Id
: constant Node_Id
:= Defining_Entity
(N
);
1042 Body_Required
: Boolean;
1043 -- True when this package declaration requires a corresponding body
1045 Comp_Unit
: Boolean;
1046 -- True when this package declaration is not a nested declaration
1049 -- True when in the context of a declared pure library unit
1051 -- Start of processing for Analyze_Package_Declaration
1054 if Debug_Flag_C
then
1055 Write_Str
("==> package spec ");
1056 Write_Name
(Chars
(Id
));
1057 Write_Str
(" from ");
1058 Write_Location
(Sloc
(N
));
1063 -- The package declaration may be subject to pragma Ghost with policy
1064 -- Ignore. Set the mode now to ensure that any nodes generated during
1065 -- analysis and expansion are properly flagged as ignored Ghost.
1069 Generate_Definition
(Id
);
1071 Set_Ekind
(Id
, E_Package
);
1072 Set_Etype
(Id
, Standard_Void_Type
);
1074 -- Set SPARK_Mode from context only for non-generic package
1076 if Ekind
(Id
) = E_Package
then
1077 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
1078 Set_SPARK_Aux_Pragma
(Id
, SPARK_Mode_Pragma
);
1079 Set_SPARK_Pragma_Inherited
(Id
, True);
1080 Set_SPARK_Aux_Pragma_Inherited
(Id
, True);
1083 -- A package declared within a Ghost refion is automatically Ghost
1084 -- (SPARK RM 6.9(2)).
1086 if Ghost_Mode
> None
then
1087 Set_Is_Ghost_Entity
(Id
);
1090 -- Analyze aspect specifications immediately, since we need to recognize
1091 -- things like Pure early enough to diagnose violations during analysis.
1093 if Has_Aspects
(N
) then
1094 Analyze_Aspect_Specifications
(N
, Id
);
1097 -- Ada 2005 (AI-217): Check if the package has been illegally named
1098 -- in a limited-with clause of its own context. In this case the error
1099 -- has been previously notified by Analyze_Context.
1101 -- limited with Pkg; -- ERROR
1102 -- package Pkg is ...
1104 if From_Limited_With
(Id
) then
1111 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
1112 Set_Is_Pure
(Id
, PF
);
1114 Set_Categorization_From_Pragmas
(N
);
1116 Analyze
(Specification
(N
));
1117 Validate_Categorization_Dependency
(N
, Id
);
1119 Body_Required
:= Unit_Requires_Body
(Id
);
1121 -- When this spec does not require an explicit body, we know that there
1122 -- are no entities requiring completion in the language sense; we call
1123 -- Check_Completion here only to ensure that any nested package
1124 -- declaration that requires an implicit body gets one. (In the case
1125 -- where a body is required, Check_Completion is called at the end of
1126 -- the body's declarative part.)
1128 if not Body_Required
then
1132 Comp_Unit
:= Nkind
(Parent
(N
)) = N_Compilation_Unit
;
1136 -- Set Body_Required indication on the compilation unit node, and
1137 -- determine whether elaboration warnings may be meaningful on it.
1139 Set_Body_Required
(Parent
(N
), Body_Required
);
1141 if not Body_Required
then
1142 Set_Suppress_Elaboration_Warnings
(Id
);
1146 End_Package_Scope
(Id
);
1148 -- For the declaration of a library unit that is a remote types package,
1149 -- check legality rules regarding availability of stream attributes for
1150 -- types that contain non-remote access values. This subprogram performs
1151 -- visibility tests that rely on the fact that we have exited the scope
1155 Validate_RT_RAT_Component
(N
);
1158 if Debug_Flag_C
then
1160 Write_Str
("<== package spec ");
1161 Write_Name
(Chars
(Id
));
1162 Write_Str
(" from ");
1163 Write_Location
(Sloc
(N
));
1168 end Analyze_Package_Declaration
;
1170 -----------------------------------
1171 -- Analyze_Package_Specification --
1172 -----------------------------------
1174 -- Note that this code is shared for the analysis of generic package specs
1175 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
1177 procedure Analyze_Package_Specification
(N
: Node_Id
) is
1178 Id
: constant Entity_Id
:= Defining_Entity
(N
);
1179 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
1180 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
1181 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
1184 Public_Child
: Boolean;
1186 Private_With_Clauses_Installed
: Boolean := False;
1187 -- In Ada 2005, private with_clauses are visible in the private part
1188 -- of a nested package, even if it appears in the public part of the
1189 -- enclosing package. This requires a separate step to install these
1190 -- private_with_clauses, and remove them at the end of the nested
1193 procedure Check_One_Tagged_Type_Or_Extension_At_Most
;
1194 -- Issue an error in SPARK mode if a package specification contains
1195 -- more than one tagged type or type extension.
1197 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
1198 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
1199 -- Is_True_Constant) on all variables that are entities of Id, and on
1200 -- the chain whose first element is FE. A recursive call is made for all
1201 -- packages and generic packages.
1203 procedure Generate_Parent_References
;
1204 -- For a child unit, generate references to parent units, for
1205 -- GPS navigation purposes.
1207 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
1208 -- Child and Unit are entities of compilation units. True if Child
1209 -- is a public child of Parent as defined in 10.1.1
1211 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
1212 -- Reject completion of an incomplete or private type declarations
1213 -- having a known discriminant part by an unchecked union.
1215 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
1216 -- Given the package entity of a generic package instantiation or
1217 -- formal package whose corresponding generic is a child unit, installs
1218 -- the private declarations of each of the child unit's parents.
1219 -- This has to be done at the point of entering the instance package's
1220 -- private part rather than being done in Sem_Ch12.Install_Parent
1221 -- (which is where the parents' visible declarations are installed).
1223 ------------------------------------------------
1224 -- Check_One_Tagged_Type_Or_Extension_At_Most --
1225 ------------------------------------------------
1227 procedure Check_One_Tagged_Type_Or_Extension_At_Most
is
1230 procedure Check_Decls
(Decls
: List_Id
);
1231 -- Check that either Previous is Empty and Decls does not contain
1232 -- more than one tagged type or type extension, or Previous is
1233 -- already set and Decls contains no tagged type or type extension.
1239 procedure Check_Decls
(Decls
: List_Id
) is
1243 Decl
:= First
(Decls
);
1244 while Present
(Decl
) loop
1245 if Nkind
(Decl
) = N_Full_Type_Declaration
1246 and then Is_Tagged_Type
(Defining_Identifier
(Decl
))
1248 if No
(Previous
) then
1252 Error_Msg_Sloc
:= Sloc
(Previous
);
1253 Check_SPARK_05_Restriction
1254 ("at most one tagged type or type extension allowed",
1255 "\\ previous declaration#",
1264 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
1268 Check_Decls
(Vis_Decls
);
1270 if Present
(Priv_Decls
) then
1271 Check_Decls
(Priv_Decls
);
1273 end Check_One_Tagged_Type_Or_Extension_At_Most
;
1275 ---------------------
1276 -- Clear_Constants --
1277 ---------------------
1279 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
1283 -- Ignore package renamings, not interesting and they can cause self
1284 -- referential loops in the code below.
1286 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
1290 -- Note: in the loop below, the check for Next_Entity pointing back
1291 -- to the package entity may seem odd, but it is needed, because a
1292 -- package can contain a renaming declaration to itself, and such
1293 -- renamings are generated automatically within package instances.
1296 while Present
(E
) and then E
/= Id
loop
1297 if Is_Assignable
(E
) then
1298 Set_Never_Set_In_Source
(E
, False);
1299 Set_Is_True_Constant
(E
, False);
1300 Set_Current_Value
(E
, Empty
);
1301 Set_Is_Known_Null
(E
, False);
1302 Set_Last_Assignment
(E
, Empty
);
1304 if not Can_Never_Be_Null
(E
) then
1305 Set_Is_Known_Non_Null
(E
, False);
1308 elsif Is_Package_Or_Generic_Package
(E
) then
1309 Clear_Constants
(E
, First_Entity
(E
));
1310 Clear_Constants
(E
, First_Private_Entity
(E
));
1315 end Clear_Constants
;
1317 --------------------------------
1318 -- Generate_Parent_References --
1319 --------------------------------
1321 procedure Generate_Parent_References
is
1322 Decl
: constant Node_Id
:= Parent
(N
);
1325 if Id
= Cunit_Entity
(Main_Unit
)
1326 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
1328 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1330 elsif not Nkind_In
(Unit
(Cunit
(Main_Unit
)), N_Subprogram_Body
,
1333 -- If current unit is an ancestor of main unit, generate a
1334 -- reference to its own parent.
1338 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
1341 if Nkind
(Main_Spec
) = N_Package_Body
then
1342 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
1345 U
:= Parent_Spec
(Main_Spec
);
1346 while Present
(U
) loop
1347 if U
= Parent
(Decl
) then
1348 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1351 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
1355 U
:= Parent_Spec
(Unit
(U
));
1360 end Generate_Parent_References
;
1362 ---------------------
1363 -- Is_Public_Child --
1364 ---------------------
1366 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
1368 if not Is_Private_Descendant
(Child
) then
1371 if Child
= Unit
then
1372 return not Private_Present
(
1373 Parent
(Unit_Declaration_Node
(Child
)));
1375 return Is_Public_Child
(Scope
(Child
), Unit
);
1378 end Is_Public_Child
;
1380 ----------------------------------------
1381 -- Inspect_Unchecked_Union_Completion --
1382 ----------------------------------------
1384 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
1388 Decl
:= First
(Decls
);
1389 while Present
(Decl
) loop
1391 -- We are looking at an incomplete or private type declaration
1392 -- with a known_discriminant_part whose full view is an
1395 if Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
1396 N_Private_Type_Declaration
)
1397 and then Has_Discriminants
(Defining_Identifier
(Decl
))
1398 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
1400 Is_Unchecked_Union
(Full_View
(Defining_Identifier
(Decl
)))
1403 ("completion of discriminated partial view "
1404 & "cannot be an unchecked union",
1405 Full_View
(Defining_Identifier
(Decl
)));
1410 end Inspect_Unchecked_Union_Completion
;
1412 -----------------------------------------
1413 -- Install_Parent_Private_Declarations --
1414 -----------------------------------------
1416 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
1417 Inst_Par
: Entity_Id
;
1418 Gen_Par
: Entity_Id
;
1419 Inst_Node
: Node_Id
;
1422 Inst_Par
:= Inst_Id
;
1425 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
1426 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
1427 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
1429 if Nkind_In
(Inst_Node
, N_Package_Instantiation
,
1430 N_Formal_Package_Declaration
)
1431 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
1433 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
1435 if Present
(Renamed_Entity
(Inst_Par
)) then
1436 Inst_Par
:= Renamed_Entity
(Inst_Par
);
1441 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
1443 -- Install the private declarations and private use clauses
1444 -- of a parent instance of the child instance, unless the
1445 -- parent instance private declarations have already been
1446 -- installed earlier in Analyze_Package_Specification, which
1447 -- happens when a generic child is instantiated, and the
1448 -- instance is a child of the parent instance.
1450 -- Installing the use clauses of the parent instance twice
1451 -- is both unnecessary and wrong, because it would cause the
1452 -- clauses to be chained to themselves in the use clauses
1453 -- list of the scope stack entry. That in turn would cause
1454 -- an endless loop from End_Use_Clauses upon scope exit.
1456 -- The parent is now fully visible. It may be a hidden open
1457 -- scope if we are currently compiling some child instance
1458 -- declared within it, but while the current instance is being
1459 -- compiled the parent is immediately visible. In particular
1460 -- its entities must remain visible if a stack save/restore
1461 -- takes place through a call to Rtsfind.
1463 if Present
(Gen_Par
) then
1464 if not In_Private_Part
(Inst_Par
) then
1465 Install_Private_Declarations
(Inst_Par
);
1466 Set_Use
(Private_Declarations
1468 (Unit_Declaration_Node
(Inst_Par
))));
1469 Set_Is_Hidden_Open_Scope
(Inst_Par
, False);
1472 -- If we've reached the end of the generic instance parents,
1473 -- then finish off by looping through the nongeneric parents
1474 -- and installing their private declarations.
1476 -- If one of the non-generic parents is itself on the scope
1477 -- stack, do not install its private declarations: they are
1478 -- installed in due time when the private part of that parent
1479 -- is analyzed. This is delicate ???
1482 while Present
(Inst_Par
)
1483 and then Inst_Par
/= Standard_Standard
1484 and then (not In_Open_Scopes
(Inst_Par
)
1485 or else not In_Private_Part
(Inst_Par
))
1487 Install_Private_Declarations
(Inst_Par
);
1488 Set_Use
(Private_Declarations
1490 (Unit_Declaration_Node
(Inst_Par
))));
1491 Inst_Par
:= Scope
(Inst_Par
);
1501 end Install_Parent_Private_Declarations
;
1503 -- Start of processing for Analyze_Package_Specification
1506 if Present
(Vis_Decls
) then
1507 Analyze_Declarations
(Vis_Decls
);
1510 -- Inspect the entities defined in the package and ensure that all
1511 -- incomplete types have received full declarations. Build default
1512 -- initial condition and invariant procedures for all qualifying types.
1514 E
:= First_Entity
(Id
);
1515 while Present
(E
) loop
1517 -- Check on incomplete types
1519 -- AI05-0213: A formal incomplete type has no completion
1521 if Ekind
(E
) = E_Incomplete_Type
1522 and then No
(Full_View
(E
))
1523 and then not Is_Generic_Type
(E
)
1525 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
1530 -- Each private type subject to pragma Default_Initial_Condition
1531 -- declares a specialized procedure which verifies the assumption
1532 -- of the pragma. The declaration appears in the visible part of
1533 -- the package to allow for being called from the outside.
1535 if Has_Default_Init_Cond
(E
) then
1536 Build_Default_Init_Cond_Procedure_Declaration
(E
);
1538 -- A private extension inherits the default initial condition
1539 -- procedure from its parent type.
1541 elsif Has_Inherited_Default_Init_Cond
(E
) then
1542 Inherit_Default_Init_Cond_Procedure
(E
);
1545 -- If invariants are present, build the invariant procedure for a
1546 -- private type, but not any of its subtypes or interface types.
1548 if Has_Invariants
(E
) then
1549 if Ekind
(E
) = E_Private_Subtype
then
1552 Build_Invariant_Procedure
(E
, N
);
1560 if Is_Remote_Call_Interface
(Id
)
1561 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
1563 Validate_RCI_Declarations
(Id
);
1566 -- Save global references in the visible declarations, before installing
1567 -- private declarations of parent unit if there is one, because the
1568 -- privacy status of types defined in the parent will change. This is
1569 -- only relevant for generic child units, but is done in all cases for
1572 if Ekind
(Id
) = E_Generic_Package
1573 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1576 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1577 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1579 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1580 Save_Global_References
(Orig_Decl
);
1581 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1585 -- If package is a public child unit, then make the private declarations
1586 -- of the parent visible.
1588 Public_Child
:= False;
1592 Pack_Decl
: Node_Id
;
1597 Par_Spec
:= Parent_Spec
(Parent
(N
));
1599 -- If the package is formal package of an enclosing generic, it is
1600 -- transformed into a local generic declaration, and compiled to make
1601 -- its spec available. We need to retrieve the original generic to
1602 -- determine whether it is a child unit, and install its parents.
1606 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1608 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1609 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1612 if Present
(Par_Spec
) then
1613 Generate_Parent_References
;
1615 while Scope
(Par
) /= Standard_Standard
1616 and then Is_Public_Child
(Id
, Par
)
1617 and then In_Open_Scopes
(Par
)
1619 Public_Child
:= True;
1621 Install_Private_Declarations
(Par
);
1622 Install_Private_With_Clauses
(Par
);
1623 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1624 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1629 if Is_Compilation_Unit
(Id
) then
1630 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
);
1724 -- An invariant may appear on a full view of a type
1727 and then Has_Private_Declaration
(E
)
1728 and then Nkind
(Parent
(E
)) = N_Full_Type_Declaration
1731 IP_Built
: Boolean := False;
1734 if Has_Aspects
(Parent
(E
)) then
1739 ASN
:= First
(Aspect_Specifications
(Parent
(E
)));
1740 while Present
(ASN
) loop
1741 if Nam_In
(Chars
(Identifier
(ASN
)),
1743 Name_Type_Invariant
)
1745 Build_Invariant_Procedure
(E
, N
);
1755 -- Invariants may have been inherited from progenitors
1758 and then Has_Interfaces
(E
)
1759 and then Has_Inheritable_Invariants
(E
)
1760 and then not Is_Interface
(E
)
1761 and then not Is_Class_Wide_Type
(E
)
1763 Build_Invariant_Procedure
(E
, N
);
1771 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1772 -- declaration having a known_discriminant_part shall not be an
1773 -- unchecked union type.
1775 if Present
(Vis_Decls
) then
1776 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1779 if Present
(Priv_Decls
) then
1780 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1783 if Ekind
(Id
) = E_Generic_Package
1784 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1785 and then Present
(Priv_Decls
)
1787 -- Save global references in private declarations, ignoring the
1788 -- visible declarations that were processed earlier.
1791 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1792 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1793 Save_Form
: constant List_Id
:=
1794 Generic_Formal_Declarations
(Orig_Decl
);
1797 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1798 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1799 Save_Global_References
(Orig_Decl
);
1800 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1801 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1805 Process_End_Label
(N
, 'e', Id
);
1807 -- Remove private_with_clauses of enclosing compilation unit, if they
1810 if Private_With_Clauses_Installed
then
1811 Remove_Private_With_Clauses
(Cunit
(Current_Sem_Unit
));
1814 -- For the case of a library level package, we must go through all the
1815 -- entities clearing the indications that the value may be constant and
1816 -- not modified. Why? Because any client of this package may modify
1817 -- these values freely from anywhere. This also applies to any nested
1818 -- packages or generic packages.
1820 -- For now we unconditionally clear constants for packages that are
1821 -- instances of generic packages. The reason is that we do not have the
1822 -- body yet, and we otherwise think things are unreferenced when they
1823 -- are not. This should be fixed sometime (the effect is not terrible,
1824 -- we just lose some warnings, and also some cases of value propagation)
1827 if Is_Library_Level_Entity
(Id
)
1828 or else Is_Generic_Instance
(Id
)
1830 Clear_Constants
(Id
, First_Entity
(Id
));
1831 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1834 -- Issue an error in SPARK mode if a package specification contains
1835 -- more than one tagged type or type extension.
1837 Check_One_Tagged_Type_Or_Extension_At_Most
;
1839 -- If switch set, output information on why body required
1841 if List_Body_Required_Info
1842 and then In_Extended_Main_Source_Unit
(Id
)
1843 and then Unit_Requires_Body
(Id
)
1845 Unit_Requires_Body_Info
(Id
);
1847 end Analyze_Package_Specification
;
1849 --------------------------------------
1850 -- Analyze_Private_Type_Declaration --
1851 --------------------------------------
1853 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1854 GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
1855 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1856 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1859 -- The private type declaration may be subject to pragma Ghost with
1860 -- policy Ignore. Set the mode now to ensure that any nodes generated
1861 -- during analysis and expansion are properly flagged as ignored Ghost.
1865 Generate_Definition
(Id
);
1866 Set_Is_Pure
(Id
, PF
);
1867 Init_Size_Align
(Id
);
1869 if not Is_Package_Or_Generic_Package
(Current_Scope
)
1870 or else In_Private_Part
(Current_Scope
)
1872 Error_Msg_N
("invalid context for private declaration", N
);
1875 New_Private_Type
(N
, Id
, N
);
1876 Set_Depends_On_Private
(Id
);
1878 -- A type declared within a Ghost region is automatically Ghost
1879 -- (SPARK RM 6.9(2)).
1881 if Ghost_Mode
> None
then
1882 Set_Is_Ghost_Entity
(Id
);
1885 if Has_Aspects
(N
) then
1886 Analyze_Aspect_Specifications
(N
, Id
);
1889 -- Restore the original Ghost mode once analysis and expansion have
1893 end Analyze_Private_Type_Declaration
;
1895 ----------------------------------
1896 -- Check_Anonymous_Access_Types --
1897 ----------------------------------
1899 procedure Check_Anonymous_Access_Types
1900 (Spec_Id
: Entity_Id
;
1907 -- Itype references are only needed by gigi, to force elaboration of
1908 -- itypes. In the absence of code generation, they are not needed.
1910 if not Expander_Active
then
1914 E
:= First_Entity
(Spec_Id
);
1915 while Present
(E
) loop
1916 if Ekind
(E
) = E_Anonymous_Access_Type
1917 and then From_Limited_With
(E
)
1919 IR
:= Make_Itype_Reference
(Sloc
(P_Body
));
1922 if No
(Declarations
(P_Body
)) then
1923 Set_Declarations
(P_Body
, New_List
(IR
));
1925 Prepend
(IR
, Declarations
(P_Body
));
1931 end Check_Anonymous_Access_Types
;
1933 -------------------------------------------
1934 -- Declare_Inherited_Private_Subprograms --
1935 -------------------------------------------
1937 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1939 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1940 -- Check whether an inherited subprogram S is an operation of an
1941 -- untagged derived type T.
1943 ---------------------
1944 -- Is_Primitive_Of --
1945 ---------------------
1947 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1951 -- If the full view is a scalar type, the type is the anonymous base
1952 -- type, but the operation mentions the first subtype, so check the
1953 -- signature against the base type.
1955 if Base_Type
(Etype
(S
)) = Base_Type
(T
) then
1959 Formal
:= First_Formal
(S
);
1960 while Present
(Formal
) loop
1961 if Base_Type
(Etype
(Formal
)) = Base_Type
(T
) then
1965 Next_Formal
(Formal
);
1970 end Is_Primitive_Of
;
1977 Op_Elmt_2
: Elmt_Id
;
1978 Prim_Op
: Entity_Id
;
1979 New_Op
: Entity_Id
:= Empty
;
1980 Parent_Subp
: Entity_Id
;
1983 -- Start of processing for Declare_Inherited_Private_Subprograms
1986 E
:= First_Entity
(Id
);
1987 while Present
(E
) loop
1989 -- If the entity is a nonprivate type extension whose parent type
1990 -- is declared in an open scope, then the type may have inherited
1991 -- operations that now need to be made visible. Ditto if the entity
1992 -- is a formal derived type in a child unit.
1994 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1996 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1997 and then Is_Generic_Type
(E
)))
1998 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1999 and then Is_Base_Type
(E
)
2001 if Is_Tagged_Type
(E
) then
2002 Op_List
:= Primitive_Operations
(E
);
2004 Tag
:= First_Tag_Component
(E
);
2006 Op_Elmt
:= First_Elmt
(Op_List
);
2007 while Present
(Op_Elmt
) loop
2008 Prim_Op
:= Node
(Op_Elmt
);
2010 -- Search primitives that are implicit operations with an
2011 -- internal name whose parent operation has a normal name.
2013 if Present
(Alias
(Prim_Op
))
2014 and then Find_Dispatching_Type
(Alias
(Prim_Op
)) /= E
2015 and then not Comes_From_Source
(Prim_Op
)
2016 and then Is_Internal_Name
(Chars
(Prim_Op
))
2017 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
2019 Parent_Subp
:= Alias
(Prim_Op
);
2021 -- Case 1: Check if the type has also an explicit
2022 -- overriding for this primitive.
2024 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
2025 while Present
(Op_Elmt_2
) loop
2027 -- Skip entities with attribute Interface_Alias since
2028 -- they are not overriding primitives (these entities
2029 -- link an interface primitive with their covering
2032 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
2033 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
2034 and then No
(Interface_Alias
(Node
(Op_Elmt_2
)))
2036 -- The private inherited operation has been
2037 -- overridden by an explicit subprogram:
2038 -- replace the former by the latter.
2040 New_Op
:= Node
(Op_Elmt_2
);
2041 Replace_Elmt
(Op_Elmt
, New_Op
);
2042 Remove_Elmt
(Op_List
, Op_Elmt_2
);
2043 Set_Overridden_Operation
(New_Op
, Parent_Subp
);
2045 -- We don't need to inherit its dispatching slot.
2046 -- Set_All_DT_Position has previously ensured that
2047 -- the same slot was assigned to the two primitives
2050 and then Present
(DTC_Entity
(New_Op
))
2051 and then Present
(DTC_Entity
(Prim_Op
))
2054 (DT_Position
(New_Op
) = DT_Position
(Prim_Op
));
2058 goto Next_Primitive
;
2061 Next_Elmt
(Op_Elmt_2
);
2064 -- Case 2: We have not found any explicit overriding and
2065 -- hence we need to declare the operation (i.e., make it
2068 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
2070 -- Inherit the dispatching slot if E is already frozen
2073 and then Present
(DTC_Entity
(Alias
(Prim_Op
)))
2075 Set_DTC_Entity_Value
(E
, New_Op
);
2076 Set_DT_Position_Value
(New_Op
,
2077 DT_Position
(Alias
(Prim_Op
)));
2081 (Is_Dispatching_Operation
(New_Op
)
2082 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
2084 -- Substitute the new operation for the old one in the
2085 -- type's primitive operations list. Since the new
2086 -- operation was also just added to the end of list,
2087 -- the last element must be removed.
2089 -- (Question: is there a simpler way of declaring the
2090 -- operation, say by just replacing the name of the
2091 -- earlier operation, reentering it in the in the symbol
2092 -- table (how?), and marking it as private???)
2094 Replace_Elmt
(Op_Elmt
, New_Op
);
2095 Remove_Last_Elmt
(Op_List
);
2099 Next_Elmt
(Op_Elmt
);
2102 -- Generate listing showing the contents of the dispatch table
2104 if Debug_Flag_ZZ
then
2109 -- For untagged type, scan forward to locate inherited hidden
2112 Prim_Op
:= Next_Entity
(E
);
2113 while Present
(Prim_Op
) loop
2114 if Is_Subprogram
(Prim_Op
)
2115 and then Present
(Alias
(Prim_Op
))
2116 and then not Comes_From_Source
(Prim_Op
)
2117 and then Is_Internal_Name
(Chars
(Prim_Op
))
2118 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
2119 and then Is_Primitive_Of
(E
, Prim_Op
)
2121 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
2124 Next_Entity
(Prim_Op
);
2126 -- Derived operations appear immediately after the type
2127 -- declaration (or the following subtype indication for
2128 -- a derived scalar type). Further declarations cannot
2129 -- include inherited operations of the type.
2131 if Present
(Prim_Op
) then
2132 exit when Ekind
(Prim_Op
) not in Overloadable_Kind
;
2140 end Declare_Inherited_Private_Subprograms
;
2142 -----------------------
2143 -- End_Package_Scope --
2144 -----------------------
2146 procedure End_Package_Scope
(P
: Entity_Id
) is
2148 Uninstall_Declarations
(P
);
2150 end End_Package_Scope
;
2152 ---------------------------
2153 -- Exchange_Declarations --
2154 ---------------------------
2156 procedure Exchange_Declarations
(Id
: Entity_Id
) is
2157 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
2158 H1
: constant Entity_Id
:= Homonym
(Id
);
2159 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
2164 -- If missing full declaration for type, nothing to exchange
2166 if No
(Full_Id
) then
2170 -- Otherwise complete the exchange, and preserve semantic links
2172 Next2
:= Next_Entity
(Full_Id
);
2173 H2
:= Homonym
(Full_Id
);
2175 -- Reset full declaration pointer to reflect the switched entities and
2176 -- readjust the next entity chains.
2178 Exchange_Entities
(Id
, Full_Id
);
2180 Set_Next_Entity
(Id
, Next1
);
2181 Set_Homonym
(Id
, H1
);
2183 Set_Full_View
(Full_Id
, Id
);
2184 Set_Next_Entity
(Full_Id
, Next2
);
2185 Set_Homonym
(Full_Id
, H2
);
2186 end Exchange_Declarations
;
2188 ----------------------------
2189 -- Install_Package_Entity --
2190 ----------------------------
2192 procedure Install_Package_Entity
(Id
: Entity_Id
) is
2194 if not Is_Internal
(Id
) then
2195 if Debug_Flag_E
then
2196 Write_Str
("Install: ");
2197 Write_Name
(Chars
(Id
));
2201 if Is_Child_Unit
(Id
) then
2204 -- Do not enter implicitly inherited non-overridden subprograms of
2205 -- a tagged type back into visibility if they have non-conformant
2206 -- homographs (Ada RM 8.3 12.3/2).
2208 elsif Is_Hidden_Non_Overridden_Subpgm
(Id
) then
2212 Set_Is_Immediately_Visible
(Id
);
2215 end Install_Package_Entity
;
2217 ----------------------------------
2218 -- Install_Private_Declarations --
2219 ----------------------------------
2221 procedure Install_Private_Declarations
(P
: Entity_Id
) is
2224 Priv_Deps
: Elist_Id
;
2226 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
);
2227 -- When the full view of a private type is made available, we do the
2228 -- same for its private dependents under proper visibility conditions.
2229 -- When compiling a grand-chid unit this needs to be done recursively.
2231 -----------------------------
2232 -- Swap_Private_Dependents --
2233 -----------------------------
2235 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
) is
2238 Priv_Elmt
: Elmt_Id
;
2242 Priv_Elmt
:= First_Elmt
(Priv_Deps
);
2243 while Present
(Priv_Elmt
) loop
2244 Priv
:= Node
(Priv_Elmt
);
2246 -- Before the exchange, verify that the presence of the Full_View
2247 -- field. This field will be empty if the entity has already been
2248 -- installed due to a previous call.
2250 if Present
(Full_View
(Priv
)) and then Is_Visible_Dependent
(Priv
)
2252 if Is_Private_Type
(Priv
) then
2253 Deps
:= Private_Dependents
(Priv
);
2259 -- For each subtype that is swapped, we also swap the reference
2260 -- to it in Private_Dependents, to allow access to it when we
2261 -- swap them out in End_Package_Scope.
2263 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
2265 -- Ensure that both views of the dependent private subtype are
2266 -- immediately visible if within some open scope. Check full
2267 -- view before exchanging views.
2269 if In_Open_Scopes
(Scope
(Full_View
(Priv
))) then
2270 Set_Is_Immediately_Visible
(Priv
);
2273 Exchange_Declarations
(Priv
);
2274 Set_Is_Immediately_Visible
2275 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
2277 Set_Is_Potentially_Use_Visible
2278 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
2280 -- Within a child unit, recurse, except in generic child unit,
2281 -- which (unfortunately) handle private_dependents separately.
2284 and then Is_Child_Unit
(Cunit_Entity
(Current_Sem_Unit
))
2285 and then not Is_Empty_Elmt_List
(Deps
)
2286 and then not Inside_A_Generic
2288 Swap_Private_Dependents
(Deps
);
2292 Next_Elmt
(Priv_Elmt
);
2294 end Swap_Private_Dependents
;
2296 -- Start of processing for Install_Private_Declarations
2299 -- First exchange declarations for private types, so that the full
2300 -- declaration is visible. For each private type, we check its
2301 -- Private_Dependents list and also exchange any subtypes of or derived
2302 -- types from it. Finally, if this is a Taft amendment type, the
2303 -- incomplete declaration is irrelevant, and we want to link the
2304 -- eventual full declaration with the original private one so we
2305 -- also skip the exchange.
2307 Id
:= First_Entity
(P
);
2308 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2309 if Is_Private_Base_Type
(Id
)
2310 and then Present
(Full_View
(Id
))
2311 and then Comes_From_Source
(Full_View
(Id
))
2312 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
2313 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
2315 -- If there is a use-type clause on the private type, set the full
2316 -- view accordingly.
2318 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
2319 Full
:= Full_View
(Id
);
2321 if Is_Private_Base_Type
(Full
)
2322 and then Has_Private_Declaration
(Full
)
2323 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
2324 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
2325 and then In_Package_Body
(Current_Scope
)
2326 and then not Is_Private_Type
(Etype
(Full
))
2328 -- This is the completion of a private type by a derivation
2329 -- from another private type which is not private anymore. This
2330 -- can only happen in a package nested within a child package,
2331 -- when the parent type is defined in the parent unit. At this
2332 -- point the current type is not private either, and we have
2333 -- to install the underlying full view, which is now visible.
2334 -- Save the current full view as well, so that all views can be
2335 -- restored on exit. It may seem that after compiling the child
2336 -- body there are not environments to restore, but the back-end
2337 -- expects those links to be valid, and freeze nodes depend on
2340 if No
(Full_View
(Full
))
2341 and then Present
(Underlying_Full_View
(Full
))
2343 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
2344 Set_Underlying_Full_View
(Id
, Full
);
2346 Set_Underlying_Full_View
(Full
, Empty
);
2347 Set_Is_Frozen
(Full_View
(Id
));
2351 Priv_Deps
:= Private_Dependents
(Id
);
2352 Exchange_Declarations
(Id
);
2353 Set_Is_Immediately_Visible
(Id
);
2354 Swap_Private_Dependents
(Priv_Deps
);
2360 -- Next make other declarations in the private part visible as well
2362 Id
:= First_Private_Entity
(P
);
2363 while Present
(Id
) loop
2364 Install_Package_Entity
(Id
);
2365 Set_Is_Hidden
(Id
, False);
2369 -- Indicate that the private part is currently visible, so it can be
2370 -- properly reset on exit.
2372 Set_In_Private_Part
(P
);
2373 end Install_Private_Declarations
;
2375 ----------------------------------
2376 -- Install_Visible_Declarations --
2377 ----------------------------------
2379 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
2381 Last_Entity
: Entity_Id
;
2385 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
2387 if Is_Package_Or_Generic_Package
(P
) then
2388 Last_Entity
:= First_Private_Entity
(P
);
2390 Last_Entity
:= Empty
;
2393 Id
:= First_Entity
(P
);
2394 while Present
(Id
) and then Id
/= Last_Entity
loop
2395 Install_Package_Entity
(Id
);
2398 end Install_Visible_Declarations
;
2400 --------------------------
2401 -- Is_Private_Base_Type --
2402 --------------------------
2404 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
2406 return Ekind
(E
) = E_Private_Type
2407 or else Ekind
(E
) = E_Limited_Private_Type
2408 or else Ekind
(E
) = E_Record_Type_With_Private
;
2409 end Is_Private_Base_Type
;
2411 --------------------------
2412 -- Is_Visible_Dependent --
2413 --------------------------
2415 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
2417 S
: constant Entity_Id
:= Scope
(Dep
);
2420 -- Renamings created for actual types have the visibility of the actual
2422 if Ekind
(S
) = E_Package
2423 and then Is_Generic_Instance
(S
)
2424 and then (Is_Generic_Actual_Type
(Dep
)
2425 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
2429 elsif not (Is_Derived_Type
(Dep
))
2430 and then Is_Derived_Type
(Full_View
(Dep
))
2432 -- When instantiating a package body, the scope stack is empty, so
2433 -- check instead whether the dependent type is defined in the same
2434 -- scope as the instance itself.
2436 return In_Open_Scopes
(S
)
2437 or else (Is_Generic_Instance
(Current_Scope
)
2438 and then Scope
(Dep
) = Scope
(Current_Scope
));
2442 end Is_Visible_Dependent
;
2444 ----------------------------
2445 -- May_Need_Implicit_Body --
2446 ----------------------------
2448 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
2449 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
2450 S
: constant Node_Id
:= Parent
(P
);
2455 if not Has_Completion
(E
)
2456 and then Nkind
(P
) = N_Package_Declaration
2457 and then (Present
(Activation_Chain_Entity
(P
)) or else Has_RACW
(E
))
2460 Make_Package_Body
(Sloc
(E
),
2461 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
2462 Chars
=> Chars
(E
)),
2463 Declarations
=> New_List
);
2465 if Nkind
(S
) = N_Package_Specification
then
2466 if Present
(Private_Declarations
(S
)) then
2467 Decls
:= Private_Declarations
(S
);
2469 Decls
:= Visible_Declarations
(S
);
2472 Decls
:= Declarations
(S
);
2478 end May_Need_Implicit_Body
;
2480 ----------------------
2481 -- New_Private_Type --
2482 ----------------------
2484 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
2486 -- For other than Ada 2012, enter the name in the current scope
2488 if Ada_Version
< Ada_2012
then
2491 -- Ada 2012 (AI05-0162): Enter the name in the current scope. Note that
2492 -- there may be an incomplete previous view.
2498 Prev
:= Find_Type_Name
(N
);
2499 pragma Assert
(Prev
= Id
2500 or else (Ekind
(Prev
) = E_Incomplete_Type
2501 and then Present
(Full_View
(Prev
))
2502 and then Full_View
(Prev
) = Id
));
2506 if Limited_Present
(Def
) then
2507 Set_Ekind
(Id
, E_Limited_Private_Type
);
2509 Set_Ekind
(Id
, E_Private_Type
);
2513 Set_Has_Delayed_Freeze
(Id
);
2514 Set_Is_First_Subtype
(Id
);
2515 Init_Size_Align
(Id
);
2517 Set_Is_Constrained
(Id
,
2518 No
(Discriminant_Specifications
(N
))
2519 and then not Unknown_Discriminants_Present
(N
));
2521 -- Set tagged flag before processing discriminants, to catch illegal
2524 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
2526 Set_Discriminant_Constraint
(Id
, No_Elist
);
2527 Set_Stored_Constraint
(Id
, No_Elist
);
2529 if Present
(Discriminant_Specifications
(N
)) then
2531 Process_Discriminants
(N
);
2534 elsif Unknown_Discriminants_Present
(N
) then
2535 Set_Has_Unknown_Discriminants
(Id
);
2538 Set_Private_Dependents
(Id
, New_Elmt_List
);
2540 if Tagged_Present
(Def
) then
2541 Set_Ekind
(Id
, E_Record_Type_With_Private
);
2542 Set_Direct_Primitive_Operations
(Id
, New_Elmt_List
);
2543 Set_Is_Abstract_Type
(Id
, Abstract_Present
(Def
));
2544 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
2545 Set_Has_Delayed_Freeze
(Id
, True);
2547 -- Create a class-wide type with the same attributes
2549 Make_Class_Wide_Type
(Id
);
2551 elsif Abstract_Present
(Def
) then
2552 Error_Msg_N
("only a tagged type can be abstract", N
);
2554 end New_Private_Type
;
2556 ---------------------------------
2557 -- Requires_Completion_In_Body --
2558 ---------------------------------
2560 function Requires_Completion_In_Body
2562 Pack_Id
: Entity_Id
) return Boolean
2565 -- Always ignore child units. Child units get added to the entity list
2566 -- of a parent unit, but are not original entities of the parent, and
2567 -- so do not affect whether the parent needs a body.
2569 if Is_Child_Unit
(Id
) then
2572 -- Ignore formal packages and their renamings
2574 elsif Ekind
(Id
) = E_Package
2575 and then Nkind
(Original_Node
(Unit_Declaration_Node
(Id
))) =
2576 N_Formal_Package_Declaration
2580 -- Otherwise test to see if entity requires a completion. Note that
2581 -- subprogram entities whose declaration does not come from source are
2582 -- ignored here on the basis that we assume the expander will provide an
2583 -- implicit completion at some point.
2585 elsif (Is_Overloadable
(Id
)
2586 and then Ekind
(Id
) /= E_Enumeration_Literal
2587 and then Ekind
(Id
) /= E_Operator
2588 and then not Is_Abstract_Subprogram
(Id
)
2589 and then not Has_Completion
(Id
)
2590 and then Comes_From_Source
(Parent
(Id
)))
2593 (Ekind
(Id
) = E_Package
2594 and then Id
/= Pack_Id
2595 and then not Has_Completion
(Id
)
2596 and then Unit_Requires_Body
(Id
))
2599 (Ekind
(Id
) = E_Incomplete_Type
2600 and then No
(Full_View
(Id
))
2601 and then not Is_Generic_Type
(Id
))
2604 (Ekind_In
(Id
, E_Task_Type
, E_Protected_Type
)
2605 and then not Has_Completion
(Id
))
2608 (Ekind
(Id
) = E_Generic_Package
2609 and then Id
/= Pack_Id
2610 and then not Has_Completion
(Id
)
2611 and then Unit_Requires_Body
(Id
))
2614 (Is_Generic_Subprogram
(Id
)
2615 and then not Has_Completion
(Id
))
2620 -- Otherwise the entity does not require completion in a package body
2625 end Requires_Completion_In_Body
;
2627 ----------------------------
2628 -- Uninstall_Declarations --
2629 ----------------------------
2631 procedure Uninstall_Declarations
(P
: Entity_Id
) is
2632 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
2635 Priv_Elmt
: Elmt_Id
;
2636 Priv_Sub
: Entity_Id
;
2638 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
2639 -- Copy to the private declaration the attributes of the full view that
2640 -- need to be available for the partial view also.
2642 function Type_In_Use
(T
: Entity_Id
) return Boolean;
2643 -- Check whether type or base type appear in an active use_type clause
2645 ------------------------------
2646 -- Preserve_Full_Attributes --
2647 ------------------------------
2649 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
2650 Priv_Is_Base_Type
: constant Boolean := Is_Base_Type
(Priv
);
2653 Set_Size_Info
(Priv
, (Full
));
2654 Set_RM_Size
(Priv
, RM_Size
(Full
));
2655 Set_Size_Known_At_Compile_Time
2656 (Priv
, Size_Known_At_Compile_Time
(Full
));
2657 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
2658 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
2659 Set_Is_Ada_2005_Only
(Priv
, Is_Ada_2005_Only
(Full
));
2660 Set_Is_Ada_2012_Only
(Priv
, Is_Ada_2012_Only
(Full
));
2661 Set_Has_Pragma_Unmodified
(Priv
, Has_Pragma_Unmodified
(Full
));
2662 Set_Has_Pragma_Unreferenced
(Priv
, Has_Pragma_Unreferenced
(Full
));
2663 Set_Has_Pragma_Unreferenced_Objects
2664 (Priv
, Has_Pragma_Unreferenced_Objects
2666 if Is_Unchecked_Union
(Full
) then
2667 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
2669 -- Why is atomic not copied here ???
2671 if Referenced
(Full
) then
2672 Set_Referenced
(Priv
);
2675 if Priv_Is_Base_Type
then
2676 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
2677 Set_Finalize_Storage_Only
2678 (Priv
, Finalize_Storage_Only
2679 (Base_Type
(Full
)));
2680 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
2681 Set_Has_Protected
(Priv
, Has_Protected
(Base_Type
(Full
)));
2682 Set_Has_Controlled_Component
2683 (Priv
, Has_Controlled_Component
2684 (Base_Type
(Full
)));
2687 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
2689 -- Propagate information of type invariants, which may be specified
2690 -- for the full view.
2692 if Has_Invariants
(Full
) and not Has_Invariants
(Priv
) then
2693 Set_Has_Invariants
(Priv
);
2694 Set_Subprograms_For_Type
(Priv
, Subprograms_For_Type
(Full
));
2697 if Is_Tagged_Type
(Priv
)
2698 and then Is_Tagged_Type
(Full
)
2699 and then not Error_Posted
(Full
)
2701 if Is_Tagged_Type
(Priv
) then
2703 -- If the type is tagged, the tag itself must be available on
2704 -- the partial view, for expansion purposes.
2706 Set_First_Entity
(Priv
, First_Entity
(Full
));
2708 -- If there are discriminants in the partial view, these remain
2709 -- visible. Otherwise only the tag itself is visible, and there
2710 -- are no nameable components in the partial view.
2712 if No
(Last_Entity
(Priv
)) then
2713 Set_Last_Entity
(Priv
, First_Entity
(Priv
));
2717 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
2719 if Has_Discriminants
(Full
) then
2720 Set_Discriminant_Constraint
(Priv
,
2721 Discriminant_Constraint
(Full
));
2724 end Preserve_Full_Attributes
;
2730 function Type_In_Use
(T
: Entity_Id
) return Boolean is
2732 return Scope
(Base_Type
(T
)) = P
2733 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
2736 -- Start of processing for Uninstall_Declarations
2739 Id
:= First_Entity
(P
);
2740 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2741 if Debug_Flag_E
then
2742 Write_Str
("unlinking visible entity ");
2743 Write_Int
(Int
(Id
));
2747 -- On exit from the package scope, we must preserve the visibility
2748 -- established by use clauses in the current scope. Two cases:
2750 -- a) If the entity is an operator, it may be a primitive operator of
2751 -- a type for which there is a visible use-type clause.
2753 -- b) for other entities, their use-visibility is determined by a
2754 -- visible use clause for the package itself. For a generic instance,
2755 -- the instantiation of the formals appears in the visible part,
2756 -- but the formals are private and remain so.
2758 if Ekind
(Id
) = E_Function
2759 and then Is_Operator_Symbol_Name
(Chars
(Id
))
2760 and then not Is_Hidden
(Id
)
2761 and then not Error_Posted
(Id
)
2763 Set_Is_Potentially_Use_Visible
(Id
,
2765 or else Type_In_Use
(Etype
(Id
))
2766 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
2767 or else (Present
(Next_Formal
(First_Formal
(Id
)))
2770 (Etype
(Next_Formal
(First_Formal
(Id
))))));
2772 if In_Use
(P
) and then not Is_Hidden
(Id
) then
2774 -- A child unit of a use-visible package remains use-visible
2775 -- only if it is itself a visible child unit. Otherwise it
2776 -- would remain visible in other contexts where P is use-
2777 -- visible, because once compiled it stays in the entity list
2778 -- of its parent unit.
2780 if Is_Child_Unit
(Id
) then
2781 Set_Is_Potentially_Use_Visible
2782 (Id
, Is_Visible_Lib_Unit
(Id
));
2784 Set_Is_Potentially_Use_Visible
(Id
);
2788 Set_Is_Potentially_Use_Visible
(Id
, False);
2792 -- Local entities are not immediately visible outside of the package
2794 Set_Is_Immediately_Visible
(Id
, False);
2796 -- If this is a private type with a full view (for example a local
2797 -- subtype of a private type declared elsewhere), ensure that the
2798 -- full view is also removed from visibility: it may be exposed when
2799 -- swapping views in an instantiation.
2801 if Is_Type
(Id
) and then Present
(Full_View
(Id
)) then
2802 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
2805 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2806 Check_Abstract_Overriding
(Id
);
2807 Check_Conventions
(Id
);
2810 if Ekind_In
(Id
, E_Private_Type
, E_Limited_Private_Type
)
2811 and then No
(Full_View
(Id
))
2812 and then not Is_Generic_Type
(Id
)
2813 and then not Is_Derived_Type
(Id
)
2815 Error_Msg_N
("missing full declaration for private type&", Id
);
2817 elsif Ekind
(Id
) = E_Record_Type_With_Private
2818 and then not Is_Generic_Type
(Id
)
2819 and then No
(Full_View
(Id
))
2821 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
2822 Error_Msg_N
("missing full declaration for private type&", Id
);
2825 ("missing full declaration for private extension", Id
);
2828 -- Case of constant, check for deferred constant declaration with
2829 -- no full view. Likely just a matter of a missing expression, or
2830 -- accidental use of the keyword constant.
2832 elsif Ekind
(Id
) = E_Constant
2834 -- OK if constant value present
2836 and then No
(Constant_Value
(Id
))
2838 -- OK if full view present
2840 and then No
(Full_View
(Id
))
2842 -- OK if imported, since that provides the completion
2844 and then not Is_Imported
(Id
)
2846 -- OK if object declaration replaced by renaming declaration as
2847 -- a result of OK_To_Rename processing (e.g. for concatenation)
2849 and then Nkind
(Parent
(Id
)) /= N_Object_Renaming_Declaration
2851 -- OK if object declaration with the No_Initialization flag set
2853 and then not (Nkind
(Parent
(Id
)) = N_Object_Declaration
2854 and then No_Initialization
(Parent
(Id
)))
2856 -- If no private declaration is present, we assume the user did
2857 -- not intend a deferred constant declaration and the problem
2858 -- is simply that the initializing expression is missing.
2860 if not Has_Private_Declaration
(Etype
(Id
)) then
2862 -- We assume that the user did not intend a deferred constant
2863 -- declaration, and the expression is just missing.
2866 ("constant declaration requires initialization expression",
2869 if Is_Limited_Type
(Etype
(Id
)) then
2871 ("\if variable intended, remove CONSTANT from declaration",
2875 -- Otherwise if a private declaration is present, then we are
2876 -- missing the full declaration for the deferred constant.
2880 ("missing full declaration for deferred constant (RM 7.4)",
2883 if Is_Limited_Type
(Etype
(Id
)) then
2885 ("\if variable intended, remove CONSTANT from declaration",
2894 -- If the specification was installed as the parent of a public child
2895 -- unit, the private declarations were not installed, and there is
2898 if not In_Private_Part
(P
) then
2901 Set_In_Private_Part
(P
, False);
2904 -- Make private entities invisible and exchange full and private
2905 -- declarations for private types. Id is now the first private entity
2908 while Present
(Id
) loop
2909 if Debug_Flag_E
then
2910 Write_Str
("unlinking private entity ");
2911 Write_Int
(Int
(Id
));
2915 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2916 Check_Abstract_Overriding
(Id
);
2917 Check_Conventions
(Id
);
2920 Set_Is_Immediately_Visible
(Id
, False);
2922 if Is_Private_Base_Type
(Id
) and then Present
(Full_View
(Id
)) then
2923 Full
:= Full_View
(Id
);
2925 -- If the partial view is not declared in the visible part of the
2926 -- package (as is the case when it is a type derived from some
2927 -- other private type in the private part of the current package),
2928 -- no exchange takes place.
2931 or else List_Containing
(Parent
(Id
)) /=
2932 Visible_Declarations
(Specification
(Decl
))
2937 -- The entry in the private part points to the full declaration,
2938 -- which is currently visible. Exchange them so only the private
2939 -- type declaration remains accessible, and link private and full
2940 -- declaration in the opposite direction. Before the actual
2941 -- exchange, we copy back attributes of the full view that must
2942 -- be available to the partial view too.
2944 Preserve_Full_Attributes
(Id
, Full
);
2946 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
2948 -- The following test may be redundant, as this is already
2949 -- diagnosed in sem_ch3. ???
2951 if not Is_Definite_Subtype
(Full
)
2952 and then Is_Definite_Subtype
(Id
)
2954 Error_Msg_Sloc
:= Sloc
(Parent
(Id
));
2956 ("full view of& not compatible with declaration#", Full
, Id
);
2959 -- Swap out the subtypes and derived types of Id that
2960 -- were compiled in this scope, or installed previously
2961 -- by Install_Private_Declarations.
2963 -- Before we do the swap, we verify the presence of the Full_View
2964 -- field which may be empty due to a swap by a previous call to
2965 -- End_Package_Scope (e.g. from the freezing mechanism).
2967 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2968 while Present
(Priv_Elmt
) loop
2969 Priv_Sub
:= Node
(Priv_Elmt
);
2971 if Present
(Full_View
(Priv_Sub
)) then
2972 if Scope
(Priv_Sub
) = P
2973 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
2975 Set_Is_Immediately_Visible
(Priv_Sub
, False);
2978 if Is_Visible_Dependent
(Priv_Sub
) then
2979 Preserve_Full_Attributes
2980 (Priv_Sub
, Full_View
(Priv_Sub
));
2981 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
2982 Exchange_Declarations
(Priv_Sub
);
2986 Next_Elmt
(Priv_Elmt
);
2989 -- Now restore the type itself to its private view
2991 Exchange_Declarations
(Id
);
2993 -- If we have installed an underlying full view for a type derived
2994 -- from a private type in a child unit, restore the proper views
2995 -- of private and full view. See corresponding code in
2996 -- Install_Private_Declarations.
2998 -- After the exchange, Full denotes the private type in the
2999 -- visible part of the package.
3001 if Is_Private_Base_Type
(Full
)
3002 and then Present
(Full_View
(Full
))
3003 and then Present
(Underlying_Full_View
(Full
))
3004 and then In_Package_Body
(Current_Scope
)
3006 Set_Full_View
(Full
, Underlying_Full_View
(Full
));
3007 Set_Underlying_Full_View
(Full
, Empty
);
3010 elsif Ekind
(Id
) = E_Incomplete_Type
3011 and then Comes_From_Source
(Id
)
3012 and then No
(Full_View
(Id
))
3014 -- Mark Taft amendment types. Verify that there are no primitive
3015 -- operations declared for the type (3.10.1(9)).
3017 Set_Has_Completion_In_Body
(Id
);
3024 Elmt
:= First_Elmt
(Private_Dependents
(Id
));
3025 while Present
(Elmt
) loop
3026 Subp
:= Node
(Elmt
);
3028 -- Is_Primitive is tested because there can be cases where
3029 -- nonprimitive subprograms (in nested packages) are added
3030 -- to the Private_Dependents list.
3032 if Is_Overloadable
(Subp
) and then Is_Primitive
(Subp
) then
3034 ("type& must be completed in the private part",
3037 -- The result type of an access-to-function type cannot be a
3038 -- Taft-amendment type, unless the version is Ada 2012 or
3039 -- later (see AI05-151).
3041 elsif Ada_Version
< Ada_2012
3042 and then Ekind
(Subp
) = E_Subprogram_Type
3044 if Etype
(Subp
) = Id
3046 (Is_Class_Wide_Type
(Etype
(Subp
))
3047 and then Etype
(Etype
(Subp
)) = Id
)
3050 ("type& must be completed in the private part",
3051 Associated_Node_For_Itype
(Subp
), Id
);
3059 elsif not Is_Child_Unit
(Id
)
3060 and then (not Is_Private_Type
(Id
) or else No
(Full_View
(Id
)))
3063 Set_Is_Potentially_Use_Visible
(Id
, False);
3069 end Uninstall_Declarations
;
3071 ------------------------
3072 -- Unit_Requires_Body --
3073 ------------------------
3075 function Unit_Requires_Body
3076 (Pack_Id
: Entity_Id
;
3077 Ignore_Abstract_State
: Boolean := False) return Boolean
3082 -- Imported entity never requires body. Right now, only subprograms can
3083 -- be imported, but perhaps in the future we will allow import of
3086 if Is_Imported
(Pack_Id
) then
3089 -- Body required if library package with pragma Elaborate_Body
3091 elsif Has_Pragma_Elaborate_Body
(Pack_Id
) then
3094 -- Body required if subprogram
3096 elsif Is_Subprogram_Or_Generic_Subprogram
(Pack_Id
) then
3099 -- Treat a block as requiring a body
3101 elsif Ekind
(Pack_Id
) = E_Block
then
3104 elsif Ekind
(Pack_Id
) = E_Package
3105 and then Nkind
(Parent
(Pack_Id
)) = N_Package_Specification
3106 and then Present
(Generic_Parent
(Parent
(Pack_Id
)))
3109 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(Pack_Id
));
3111 if Has_Pragma_Elaborate_Body
(G_P
) then
3116 -- A [generic] package that introduces at least one non-null abstract
3117 -- state requires completion. However, there is a separate rule that
3118 -- requires that such a package have a reason other than this for a
3119 -- body being required (if necessary a pragma Elaborate_Body must be
3120 -- provided). If Ignore_Abstract_State is True, we don't do this check
3121 -- (so we can use Unit_Requires_Body to check for some other reason).
3123 elsif Ekind_In
(Pack_Id
, E_Generic_Package
, E_Package
)
3124 and then not Ignore_Abstract_State
3125 and then Present
(Abstract_States
(Pack_Id
))
3126 and then not Is_Null_State
3127 (Node
(First_Elmt
(Abstract_States
(Pack_Id
))))
3132 -- Otherwise search entity chain for entity requiring completion
3134 E
:= First_Entity
(Pack_Id
);
3135 while Present
(E
) loop
3136 if Requires_Completion_In_Body
(E
, Pack_Id
) then
3144 end Unit_Requires_Body
;
3146 -----------------------------
3147 -- Unit_Requires_Body_Info --
3148 -----------------------------
3150 procedure Unit_Requires_Body_Info
(Pack_Id
: Entity_Id
) is
3154 -- An imported entity never requires body. Right now, only subprograms
3155 -- can be imported, but perhaps in the future we will allow import of
3158 if Is_Imported
(Pack_Id
) then
3161 -- Body required if library package with pragma Elaborate_Body
3163 elsif Has_Pragma_Elaborate_Body
(Pack_Id
) then
3164 Error_Msg_N
("info: & requires body (Elaborate_Body)?Y?", Pack_Id
);
3166 -- Body required if subprogram
3168 elsif Is_Subprogram_Or_Generic_Subprogram
(Pack_Id
) then
3169 Error_Msg_N
("info: & requires body (subprogram case)?Y?", Pack_Id
);
3171 -- Body required if generic parent has Elaborate_Body
3173 elsif Ekind
(Pack_Id
) = E_Package
3174 and then Nkind
(Parent
(Pack_Id
)) = N_Package_Specification
3175 and then Present
(Generic_Parent
(Parent
(Pack_Id
)))
3178 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(Pack_Id
));
3180 if Has_Pragma_Elaborate_Body
(G_P
) then
3182 ("info: & requires body (generic parent Elaborate_Body)?Y?",
3187 -- A [generic] package that introduces at least one non-null abstract
3188 -- state requires completion. However, there is a separate rule that
3189 -- requires that such a package have a reason other than this for a
3190 -- body being required (if necessary a pragma Elaborate_Body must be
3191 -- provided). If Ignore_Abstract_State is True, we don't do this check
3192 -- (so we can use Unit_Requires_Body to check for some other reason).
3194 elsif Ekind_In
(Pack_Id
, E_Generic_Package
, E_Package
)
3195 and then Present
(Abstract_States
(Pack_Id
))
3196 and then not Is_Null_State
3197 (Node
(First_Elmt
(Abstract_States
(Pack_Id
))))
3200 ("info: & requires body (non-null abstract state aspect)?Y?",
3204 -- Otherwise search entity chain for entity requiring completion
3206 E
:= First_Entity
(Pack_Id
);
3207 while Present
(E
) loop
3208 if Requires_Completion_In_Body
(E
, Pack_Id
) then
3209 Error_Msg_Node_2
:= E
;
3211 ("info: & requires body (& requires completion)?Y?", E
, Pack_Id
);
3216 end Unit_Requires_Body_Info
;