1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 -- This package contains the routines to process package specifications and
27 -- bodies. The most important semantic aspects of package processing are the
28 -- handling of private and full declarations, and the construction of dispatch
29 -- tables for tagged types.
31 with Aspects
; use Aspects
;
32 with Atree
; use Atree
;
33 with Contracts
; use Contracts
;
34 with Debug
; use Debug
;
35 with Einfo
; use Einfo
;
36 with Elists
; use Elists
;
37 with Errout
; use Errout
;
38 with Exp_Disp
; use Exp_Disp
;
39 with Exp_Dist
; use Exp_Dist
;
40 with Exp_Dbug
; use Exp_Dbug
;
41 with Freeze
; use Freeze
;
42 with Ghost
; use Ghost
;
44 with Lib
.Xref
; use Lib
.Xref
;
45 with Namet
; use Namet
;
46 with Nmake
; use Nmake
;
47 with Nlists
; use Nlists
;
49 with Output
; use Output
;
50 with Restrict
; use Restrict
;
51 with Rtsfind
; use Rtsfind
;
53 with Sem_Aux
; use Sem_Aux
;
54 with Sem_Cat
; use Sem_Cat
;
55 with Sem_Ch3
; use Sem_Ch3
;
56 with Sem_Ch6
; use Sem_Ch6
;
57 with Sem_Ch8
; use Sem_Ch8
;
58 with Sem_Ch10
; use Sem_Ch10
;
59 with Sem_Ch12
; use Sem_Ch12
;
60 with Sem_Ch13
; use Sem_Ch13
;
61 with Sem_Disp
; use Sem_Disp
;
62 with Sem_Eval
; use Sem_Eval
;
63 with Sem_Prag
; use Sem_Prag
;
64 with Sem_Util
; use Sem_Util
;
65 with Sem_Warn
; use Sem_Warn
;
66 with Snames
; use Snames
;
67 with Stand
; use Stand
;
68 with Sinfo
; use Sinfo
;
69 with Sinput
; use Sinput
;
71 with Uintp
; use Uintp
;
75 package body Sem_Ch7
is
77 -----------------------------------
78 -- Handling private declarations --
79 -----------------------------------
81 -- The principle that each entity has a single defining occurrence clashes
82 -- with the presence of two separate definitions for private types: the
83 -- first is the private type declaration, and the second is the full type
84 -- declaration. It is important that all references to the type point to
85 -- the same defining occurrence, namely the first one. To enforce the two
86 -- separate views of the entity, the corresponding information is swapped
87 -- between the two declarations. Outside of the package, the defining
88 -- occurrence only contains the private declaration information, while in
89 -- the private part and the body of the package the defining occurrence
90 -- contains the full declaration. To simplify the swap, the defining
91 -- occurrence that currently holds the private declaration points to the
92 -- full declaration. During semantic processing the defining occurrence
93 -- also points to a list of private dependents, that is to say access types
94 -- or composite types whose designated types or component types are
95 -- subtypes or derived types of the private type in question. After the
96 -- full declaration has been seen, the private dependents are updated to
97 -- indicate that they have full definitions.
99 -----------------------
100 -- Local Subprograms --
101 -----------------------
103 procedure Analyze_Package_Body_Helper
(N
: Node_Id
);
104 -- Does all the real work of Analyze_Package_Body
106 procedure Check_Anonymous_Access_Types
107 (Spec_Id
: Entity_Id
;
109 -- If the spec of a package has a limited_with_clause, it may declare
110 -- anonymous access types whose designated type is a limited view, such an
111 -- anonymous access return type for a function. This access type cannot be
112 -- elaborated in the spec itself, but it may need an itype reference if it
113 -- is used within a nested scope. In that case the itype reference is
114 -- created at the beginning of the corresponding package body and inserted
115 -- before other body declarations.
117 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
118 -- Called upon entering the private part of a public child package and the
119 -- body of a nested package, to potentially declare certain inherited
120 -- subprograms that were inherited by types in the visible part, but whose
121 -- declaration was deferred because the parent operation was private and
122 -- not visible at that point. These subprograms are located by traversing
123 -- the visible part declarations looking for non-private type extensions
124 -- and then examining each of the primitive operations of such types to
125 -- find those that were inherited but declared with a special internal
126 -- name. Each such operation is now declared as an operation with a normal
127 -- name (using the name of the parent operation) and replaces the previous
128 -- implicit operation in the primitive operations list of the type. If the
129 -- inherited private operation has been overridden, then it's replaced by
130 -- the overriding operation.
132 procedure Install_Package_Entity
(Id
: Entity_Id
);
133 -- Supporting procedure for Install_{Visible,Private}_Declarations. Places
134 -- one entity on its visibility chain, and recurses on the visible part if
135 -- the entity is an inner package.
137 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
138 -- True for a private type that is not a subtype
140 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
141 -- If the private dependent is a private type whose full view is derived
142 -- from the parent type, its full properties are revealed only if we are in
143 -- the immediate scope of the private dependent. Should this predicate be
144 -- tightened further???
146 function Requires_Completion_In_Body
149 Do_Abstract_States
: Boolean := False) return Boolean;
150 -- Subsidiary to routines Unit_Requires_Body and Unit_Requires_Body_Info.
151 -- Determine whether entity Id declared in package spec Pack_Id requires
152 -- completion in a package body. Flag Do_Abstract_Stats should be set when
153 -- abstract states are to be considered in the completion test.
155 procedure Unit_Requires_Body_Info
(Pack_Id
: Entity_Id
);
156 -- Outputs info messages showing why package Pack_Id requires a body. The
157 -- caller has checked that the switch requesting this information is set,
158 -- and that the package does indeed require a body.
160 --------------------------
161 -- Analyze_Package_Body --
162 --------------------------
164 procedure Analyze_Package_Body
(N
: Node_Id
) is
165 Loc
: constant Source_Ptr
:= Sloc
(N
);
169 Write_Str
("==> package body ");
170 Write_Name
(Chars
(Defining_Entity
(N
)));
171 Write_Str
(" from ");
172 Write_Location
(Loc
);
177 -- The real work is split out into the helper, so it can do "return;"
178 -- without skipping the debug output.
180 Analyze_Package_Body_Helper
(N
);
184 Write_Str
("<== package body ");
185 Write_Name
(Chars
(Defining_Entity
(N
)));
186 Write_Str
(" from ");
187 Write_Location
(Loc
);
190 end Analyze_Package_Body
;
192 ------------------------------------------------------
193 -- Analyze_Package_Body_Helper Data and Subprograms --
194 ------------------------------------------------------
196 Entity_Table_Size
: constant := 4093;
197 -- Number of headers in hash table
199 subtype Entity_Header_Num
is Integer range 0 .. Entity_Table_Size
- 1;
200 -- Range of headers in hash table
202 function Entity_Hash
(Id
: Entity_Id
) return Entity_Header_Num
;
203 -- Simple hash function for Entity_Ids
205 package Subprogram_Table
is new GNAT
.Htable
.Simple_HTable
206 (Header_Num
=> Entity_Header_Num
,
212 -- Hash table to record which subprograms are referenced. It is declared
213 -- at library level to avoid elaborating it for every call to Analyze.
219 function Entity_Hash
(Id
: Entity_Id
) return Entity_Header_Num
is
221 return Entity_Header_Num
(Id
mod Entity_Table_Size
);
224 ---------------------------------
225 -- Analyze_Package_Body_Helper --
226 ---------------------------------
228 -- WARNING: This routine manages Ghost regions. Return statements must be
229 -- replaced by gotos which jump to the end of the routine and restore the
232 procedure Analyze_Package_Body_Helper
(N
: Node_Id
) is
233 procedure Hide_Public_Entities
(Decls
: List_Id
);
234 -- Attempt to hide all public entities found in declarative list Decls
235 -- by resetting their Is_Public flag to False depending on whether the
236 -- entities are not referenced by inlined or generic bodies. This kind
237 -- of processing is a conservative approximation and will still leave
238 -- entities externally visible if the package is not simple enough.
240 procedure Install_Composite_Operations
(P
: Entity_Id
);
241 -- Composite types declared in the current scope may depend on types
242 -- that were private at the point of declaration, and whose full view
243 -- is now in scope. Indicate that the corresponding operations on the
244 -- composite type are available.
246 --------------------------
247 -- Hide_Public_Entities --
248 --------------------------
250 procedure Hide_Public_Entities
(Decls
: List_Id
) is
251 function Has_Referencer
253 Top_Level
: Boolean := False) return Boolean;
254 -- A "referencer" is a construct which may reference a previous
255 -- declaration. Examine all declarations in list Decls in reverse
256 -- and determine whether once such referencer exists. All entities
257 -- in the range Last (Decls) .. Referencer are hidden from external
260 function Scan_Subprogram_Ref
(N
: Node_Id
) return Traverse_Result
;
261 -- Determine whether a node denotes a reference to a subprogram
263 procedure Scan_Subprogram_Refs
is
264 new Traverse_Proc
(Scan_Subprogram_Ref
);
265 -- Subsidiary to routine Has_Referencer. Determine whether a node
266 -- contains references to a subprogram and record them.
267 -- WARNING: this is a very expensive routine as it performs a full
274 function Has_Referencer
276 Top_Level
: Boolean := False) return Boolean
282 Has_Non_Subprograms_Referencer
: Boolean := False;
283 -- Set if an inlined subprogram body was detected as a referencer.
284 -- In this case, we do not return True immediately but keep hiding
285 -- subprograms from external visibility.
292 -- Examine all declarations in reverse order, hiding all entities
293 -- from external visibility until a referencer has been found. The
294 -- algorithm recurses into nested packages.
296 Decl
:= Last
(Decls
);
297 while Present
(Decl
) loop
299 -- A stub is always considered a referencer
301 if Nkind
(Decl
) in N_Body_Stub
then
304 -- Package declaration
306 elsif Nkind
(Decl
) = N_Package_Declaration
then
307 Spec
:= Specification
(Decl
);
309 -- Inspect the declarations of a non-generic package to try
310 -- and hide more entities from external visibility.
312 if not Is_Generic_Unit
(Defining_Entity
(Spec
)) then
313 if Has_Referencer
(Private_Declarations
(Spec
))
314 or else Has_Referencer
(Visible_Declarations
(Spec
))
322 elsif Nkind
(Decl
) = N_Package_Body
323 and then Present
(Corresponding_Spec
(Decl
))
325 Decl_Id
:= Corresponding_Spec
(Decl
);
327 -- A generic package body is a referencer. It would seem
328 -- that we only have to consider generics that can be
329 -- exported, i.e. where the corresponding spec is the
330 -- spec of the current package, but because of nested
331 -- instantiations, a fully private generic body may export
332 -- other private body entities. Furthermore, regardless of
333 -- whether there was a previous inlined subprogram, (an
334 -- instantiation of) the generic package may reference any
335 -- entity declared before it.
337 if Is_Generic_Unit
(Decl_Id
) then
340 -- Inspect the declarations of a non-generic package body to
341 -- try and hide more entities from external visibility.
343 elsif Has_Referencer
(Declarations
(Decl
)) then
349 elsif Nkind
(Decl
) = N_Subprogram_Body
then
350 if Present
(Corresponding_Spec
(Decl
)) then
351 Decl_Id
:= Corresponding_Spec
(Decl
);
353 -- A generic subprogram body acts as a referencer
355 if Is_Generic_Unit
(Decl_Id
) then
359 -- An inlined subprogram body acts as a referencer
361 -- Note that we test Has_Pragma_Inline here in addition
362 -- to Is_Inlined. We are doing this for a client, since
363 -- we are computing which entities should be public, and
364 -- it is the client who will decide if actual inlining
365 -- should occur, so we need to catch all cases where the
366 -- subprogram may be inlined by the client.
368 if Is_Inlined
(Decl_Id
)
369 or else Has_Pragma_Inline
(Decl_Id
)
371 Has_Non_Subprograms_Referencer
:= True;
373 -- Inspect the statements of the subprogram body
374 -- to determine whether the body references other
377 Scan_Subprogram_Refs
(Decl
);
380 -- Otherwise this is a stand alone subprogram body
383 Decl_Id
:= Defining_Entity
(Decl
);
385 -- An inlined subprogram body acts as a referencer
387 if Is_Inlined
(Decl_Id
)
388 or else Has_Pragma_Inline
(Decl_Id
)
390 Has_Non_Subprograms_Referencer
:= True;
392 -- Inspect the statements of the subprogram body
393 -- to determine whether the body references other
396 Scan_Subprogram_Refs
(Decl
);
398 -- Otherwise we can reset Is_Public right away
400 elsif not Subprogram_Table
.Get
(Decl_Id
) then
401 Set_Is_Public
(Decl_Id
, False);
407 elsif Nkind
(Decl
) = N_Freeze_Entity
then
410 pragma Unreferenced
(Discard
);
412 -- Inspect the actions to find references to subprograms
414 Discard
:= Has_Referencer
(Actions
(Decl
));
417 -- Exceptions, objects and renamings do not need to be public
418 -- if they are not followed by a construct which can reference
419 -- and export them. The Is_Public flag is reset on top level
420 -- entities only as anything nested is local to its context.
421 -- Likewise for subprograms, but we work harder for them.
423 elsif Nkind_In
(Decl
, N_Exception_Declaration
,
424 N_Object_Declaration
,
425 N_Object_Renaming_Declaration
,
426 N_Subprogram_Declaration
,
427 N_Subprogram_Renaming_Declaration
)
429 Decl_Id
:= Defining_Entity
(Decl
);
432 and then not Is_Imported
(Decl_Id
)
433 and then not Is_Exported
(Decl_Id
)
434 and then No
(Interface_Name
(Decl_Id
))
436 (not Has_Non_Subprograms_Referencer
437 or else (Nkind
(Decl
) = N_Subprogram_Declaration
438 and then not Subprogram_Table
.Get
(Decl_Id
)))
440 Set_Is_Public
(Decl_Id
, False);
443 -- For a subprogram renaming, if the entity is referenced,
444 -- then so is the renamed subprogram. But there is an issue
445 -- with generic bodies because instantiations are not done
446 -- yet and, therefore, cannot be scanned for referencers.
447 -- That's why we use an approximation and test that we have
448 -- at least one subprogram referenced by an inlined body
449 -- instead of precisely the entity of this renaming.
451 if Nkind
(Decl
) = N_Subprogram_Renaming_Declaration
452 and then Subprogram_Table
.Get_First
453 and then Is_Entity_Name
(Name
(Decl
))
454 and then Present
(Entity
(Name
(Decl
)))
455 and then Is_Subprogram
(Entity
(Name
(Decl
)))
457 Subprogram_Table
.Set
(Entity
(Name
(Decl
)), True);
464 return Has_Non_Subprograms_Referencer
;
467 -------------------------
468 -- Scan_Subprogram_Ref --
469 -------------------------
471 function Scan_Subprogram_Ref
(N
: Node_Id
) return Traverse_Result
is
473 -- Detect a reference of the form
476 if Nkind
(N
) in N_Subprogram_Call
477 and then Is_Entity_Name
(Name
(N
))
478 and then Present
(Entity
(Name
(N
)))
479 and then Is_Subprogram
(Entity
(Name
(N
)))
481 Subprogram_Table
.Set
(Entity
(Name
(N
)), True);
483 -- Detect a reference of the form
484 -- Subp'Some_Attribute
486 elsif Nkind
(N
) = N_Attribute_Reference
487 and then Is_Entity_Name
(Prefix
(N
))
488 and then Present
(Entity
(Prefix
(N
)))
489 and then Is_Subprogram
(Entity
(Prefix
(N
)))
491 Subprogram_Table
.Set
(Entity
(Prefix
(N
)), True);
493 -- Constants can be substituted by their value in gigi, which may
494 -- contain a reference, so scan the value recursively.
496 elsif Is_Entity_Name
(N
)
497 and then Present
(Entity
(N
))
498 and then Ekind
(Entity
(N
)) = E_Constant
501 Val
: constant Node_Id
:= Constant_Value
(Entity
(N
));
504 and then not Compile_Time_Known_Value
(Val
)
506 Scan_Subprogram_Refs
(Val
);
512 end Scan_Subprogram_Ref
;
517 pragma Unreferenced
(Discard
);
519 -- Start of processing for Hide_Public_Entities
522 -- The algorithm examines the top level declarations of a package
523 -- body in reverse looking for a construct that may export entities
524 -- declared prior to it. If such a scenario is encountered, then all
525 -- entities in the range Last (Decls) .. construct are hidden from
526 -- external visibility. Consider:
534 -- package body Pack is
535 -- External_Obj : ...; -- (1)
537 -- package body Gen is -- (2)
538 -- ... External_Obj ... -- (3)
541 -- Local_Obj : ...; -- (4)
544 -- In this example Local_Obj (4) must not be externally visible as
545 -- it cannot be exported by anything in Pack. The body of generic
546 -- package Gen (2) on the other hand acts as a "referencer" and may
547 -- export anything declared before it. Since the compiler does not
548 -- perform flow analysis, it is not possible to determine precisely
549 -- which entities will be exported when Gen is instantiated. In the
550 -- example above External_Obj (1) is exported at (3), but this may
551 -- not always be the case. The algorithm takes a conservative stance
552 -- and leaves entity External_Obj public.
554 -- This very conservative algorithm is supplemented by a more precise
555 -- processing for inlined bodies. For them, we traverse the syntactic
556 -- tree and record which subprograms are actually referenced from it.
557 -- This makes it possible to compute a much smaller set of externally
558 -- visible subprograms in the absence of generic bodies, which can
559 -- have a significant impact on the inlining decisions made in the
560 -- back end and the removal of out-of-line bodies from the object
561 -- code. We do it only for inlined bodies because they are supposed
562 -- to be reasonably small and tree traversal is very expensive.
564 -- Note that even this special processing is not optimal for inlined
565 -- bodies, because we treat all inlined subprograms alike. An optimal
566 -- algorithm would require computing the transitive closure of the
567 -- inlined subprograms that can really be referenced from other units
568 -- in the source code.
570 -- We could extend this processing for inlined bodies and record all
571 -- entities, not just subprograms, referenced from them, which would
572 -- make it possible to compute a much smaller set of all externally
573 -- visible entities in the absence of generic bodies. But this would
574 -- mean implementing a more thorough tree traversal of the bodies,
575 -- i.e. not just syntactic, and the gain would very likely be worth
576 -- neither the hassle nor the slowdown of the compiler.
578 -- Finally, an important thing to be aware of is that, at this point,
579 -- instantiations are not done yet so we cannot directly see inlined
580 -- bodies coming from them. That's not catastrophic because only the
581 -- actual parameters of the instantiations matter here, and they are
582 -- present in the declarations list of the instantiated packages.
584 Subprogram_Table
.Reset
;
585 Discard
:= Has_Referencer
(Decls
, Top_Level
=> True);
586 end Hide_Public_Entities
;
588 ----------------------------------
589 -- Install_Composite_Operations --
590 ----------------------------------
592 procedure Install_Composite_Operations
(P
: Entity_Id
) is
596 Id
:= First_Entity
(P
);
597 while Present
(Id
) loop
599 and then (Is_Limited_Composite
(Id
)
600 or else Is_Private_Composite
(Id
))
601 and then No
(Private_Component
(Id
))
603 Set_Is_Limited_Composite
(Id
, False);
604 Set_Is_Private_Composite
(Id
, False);
609 end Install_Composite_Operations
;
613 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
614 Saved_ISMP
: constant Boolean :=
615 Ignore_SPARK_Mode_Pragmas_In_Instance
;
616 -- Save the Ghost and SPARK mode-related data to restore on exit
620 Last_Spec_Entity
: Entity_Id
;
625 -- Start of processing for Analyze_Package_Body_Helper
628 -- Find corresponding package specification, and establish the current
629 -- scope. The visible defining entity for the package is the defining
630 -- occurrence in the spec. On exit from the package body, all body
631 -- declarations are attached to the defining entity for the body, but
632 -- the later is never used for name resolution. In this fashion there
633 -- is only one visible entity that denotes the package.
635 -- Set Body_Id. Note that this will be reset to point to the generic
636 -- copy later on in the generic case.
638 Body_Id
:= Defining_Entity
(N
);
640 -- Body is body of package instantiation. Corresponding spec has already
643 if Present
(Corresponding_Spec
(N
)) then
644 Spec_Id
:= Corresponding_Spec
(N
);
645 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
648 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
651 and then Is_Package_Or_Generic_Package
(Spec_Id
)
653 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
655 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
656 Error_Msg_N
("cannot supply body for package renaming", N
);
659 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
660 Error_Msg_N
("redefinition of package body", N
);
665 Error_Msg_N
("missing specification for package body", N
);
669 if Is_Package_Or_Generic_Package
(Spec_Id
)
670 and then (Scope
(Spec_Id
) = Standard_Standard
671 or else Is_Child_Unit
(Spec_Id
))
672 and then not Unit_Requires_Body
(Spec_Id
)
674 if Ada_Version
= Ada_83
then
676 ("optional package body (not allowed in Ada 95)??", N
);
678 Error_Msg_N
("spec of this package does not allow a body", N
);
683 -- A [generic] package body "freezes" the contract of the nearest
684 -- enclosing package body and all other contracts encountered in the
685 -- same declarative part up to and excluding the package body:
687 -- package body Nearest_Enclosing_Package
688 -- with Refined_State => (State => Constit)
692 -- package body Freezes_Enclosing_Package_Body
693 -- with Refined_State => (State_2 => Constit_2)
698 -- with Refined_Depends => (Input => (Constit, Constit_2)) ...
700 -- This ensures that any annotations referenced by the contract of a
701 -- [generic] subprogram body declared within the current package body
702 -- are available. This form of "freezing" is decoupled from the usual
703 -- Freeze_xxx mechanism because it must also work in the context of
704 -- generics where normal freezing is disabled.
706 -- Only bodies coming from source should cause this type of "freezing".
707 -- Instantiated generic bodies are excluded because their processing is
708 -- performed in a separate compilation pass which lacks enough semantic
709 -- information with respect to contract analysis. It is safe to suppress
710 -- the "freezing" of contracts in this case because this action already
711 -- took place at the end of the enclosing declarative part.
713 if Comes_From_Source
(N
)
714 and then not Is_Generic_Instance
(Spec_Id
)
716 Analyze_Previous_Contracts
(N
);
719 -- A package body is Ghost when the corresponding spec is Ghost. Set
720 -- the mode now to ensure that any nodes generated during analysis and
721 -- expansion are properly flagged as ignored Ghost.
723 Mark_And_Set_Ghost_Body
(N
, Spec_Id
);
725 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
726 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
728 if Is_Child_Unit
(Spec_Id
) then
729 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
731 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
734 Set_Is_Child_Unit
(Body_Id
);
737 -- Generic package case
739 if Ekind
(Spec_Id
) = E_Generic_Package
then
741 -- Disable expansion and perform semantic analysis on copy. The
742 -- unannotated body will be used in all instantiations.
744 Body_Id
:= Defining_Entity
(N
);
745 Set_Ekind
(Body_Id
, E_Package_Body
);
746 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
747 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
748 Set_Body_Entity
(Spec_Id
, Body_Id
);
749 Set_Spec_Entity
(Body_Id
, Spec_Id
);
751 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
754 -- Once the contents of the generic copy and the template are
755 -- swapped, do the same for their respective aspect specifications.
757 Exchange_Aspects
(N
, New_N
);
759 -- Collect all contract-related source pragmas found within the
760 -- template and attach them to the contract of the package body.
761 -- This contract is used in the capture of global references within
764 Create_Generic_Contract
(N
);
766 -- Update Body_Id to point to the copied node for the remainder of
769 Body_Id
:= Defining_Entity
(N
);
773 -- The Body_Id is that of the copied node in the generic case, the
774 -- current node otherwise. Note that N was rewritten above, so we must
775 -- be sure to get the latest Body_Id value.
777 Set_Ekind
(Body_Id
, E_Package_Body
);
778 Set_Body_Entity
(Spec_Id
, Body_Id
);
779 Set_Spec_Entity
(Body_Id
, Spec_Id
);
781 -- Defining name for the package body is not a visible entity: Only the
782 -- defining name for the declaration is visible.
784 Set_Etype
(Body_Id
, Standard_Void_Type
);
785 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
786 Set_Corresponding_Spec
(N
, Spec_Id
);
787 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
789 -- The body entity is not used for semantics or code generation, but
790 -- it is attached to the entity list of the enclosing scope to simplify
791 -- the listing of back-annotations for the types it main contain.
793 if Scope
(Spec_Id
) /= Standard_Standard
then
794 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
797 -- Indicate that we are currently compiling the body of the package
799 Set_In_Package_Body
(Spec_Id
);
800 Set_Has_Completion
(Spec_Id
);
801 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
803 if Has_Aspects
(N
) then
804 Analyze_Aspect_Specifications
(N
, Body_Id
);
807 Push_Scope
(Spec_Id
);
809 -- Set SPARK_Mode only for non-generic package
811 if Ekind
(Spec_Id
) = E_Package
then
812 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
813 Set_SPARK_Aux_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
814 Set_SPARK_Pragma_Inherited
(Body_Id
);
815 Set_SPARK_Aux_Pragma_Inherited
(Body_Id
);
817 -- A package body may be instantiated or inlined at a later pass.
818 -- Restore the state of Ignore_SPARK_Mode_Pragmas_In_Instance when
819 -- it applied to the package spec.
821 if Ignore_SPARK_Mode_Pragmas
(Spec_Id
) then
822 Ignore_SPARK_Mode_Pragmas_In_Instance
:= True;
826 Set_Categorization_From_Pragmas
(N
);
828 Install_Visible_Declarations
(Spec_Id
);
829 Install_Private_Declarations
(Spec_Id
);
830 Install_Private_With_Clauses
(Spec_Id
);
831 Install_Composite_Operations
(Spec_Id
);
833 Check_Anonymous_Access_Types
(Spec_Id
, N
);
835 if Ekind
(Spec_Id
) = E_Generic_Package
then
836 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
839 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
840 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
842 -- This is a nested package, so it may be necessary to declare certain
843 -- inherited subprograms that are not yet visible because the parent
844 -- type's subprograms are now visible.
846 if Ekind
(Scope
(Spec_Id
)) = E_Package
847 and then Scope
(Spec_Id
) /= Standard_Standard
849 Declare_Inherited_Private_Subprograms
(Spec_Id
);
852 -- A package body "freezes" the contract of its initial declaration.
853 -- This analysis depends on attribute Corresponding_Spec being set. Only
854 -- bodies coming from source shuld cause this type of "freezing".
856 if Present
(Declarations
(N
)) then
857 Analyze_Declarations
(Declarations
(N
));
858 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
861 -- Verify that the SPARK_Mode of the body agrees with that of its spec
863 if Present
(SPARK_Pragma
(Body_Id
)) then
864 if Present
(SPARK_Aux_Pragma
(Spec_Id
)) then
865 if Get_SPARK_Mode_From_Annotation
(SPARK_Aux_Pragma
(Spec_Id
)) =
868 Get_SPARK_Mode_From_Annotation
(SPARK_Pragma
(Body_Id
)) = On
870 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
871 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
872 Error_Msg_Sloc
:= Sloc
(SPARK_Aux_Pragma
(Spec_Id
));
874 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
878 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
879 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
880 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
882 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
886 -- Analyze_Declarations has caused freezing of all types. Now generate
887 -- bodies for RACW primitives and stream attributes, if any.
889 if Ekind
(Spec_Id
) = E_Package
and then Has_RACW
(Spec_Id
) then
891 -- Attach subprogram bodies to support RACWs declared in spec
893 Append_RACW_Bodies
(Declarations
(N
), Spec_Id
);
894 Analyze_List
(Declarations
(N
));
897 HSS
:= Handled_Statement_Sequence
(N
);
899 if Present
(HSS
) then
900 Process_End_Label
(HSS
, 't', Spec_Id
);
903 -- Check that elaboration code in a preelaborable package body is
904 -- empty other than null statements and labels (RM 10.2.1(6)).
906 Validate_Null_Statement_Sequence
(N
);
909 Validate_Categorization_Dependency
(N
, Spec_Id
);
910 Check_Completion
(Body_Id
);
912 -- Generate start of body reference. Note that we do this fairly late,
913 -- because the call will use In_Extended_Main_Source_Unit as a check,
914 -- and we want to make sure that Corresponding_Stub links are set
916 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
918 -- For a generic package, collect global references and mark them on
919 -- the original body so that they are not resolved again at the point
922 if Ekind
(Spec_Id
) /= E_Package
then
923 Save_Global_References
(Original_Node
(N
));
927 -- The entities of the package body have so far been chained onto the
928 -- declaration chain for the spec. That's been fine while we were in the
929 -- body, since we wanted them to be visible, but now that we are leaving
930 -- the package body, they are no longer visible, so we remove them from
931 -- the entity chain of the package spec entity, and copy them to the
932 -- entity chain of the package body entity, where they will never again
935 if Present
(Last_Spec_Entity
) then
936 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
937 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
938 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
939 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
942 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
943 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
944 Set_First_Entity
(Spec_Id
, Empty
);
945 Set_Last_Entity
(Spec_Id
, Empty
);
948 End_Package_Scope
(Spec_Id
);
950 -- All entities declared in body are not visible
956 E
:= First_Entity
(Body_Id
);
957 while Present
(E
) loop
958 Set_Is_Immediately_Visible
(E
, False);
959 Set_Is_Potentially_Use_Visible
(E
, False);
962 -- Child units may appear on the entity list (e.g. if they appear
963 -- in the context of a subunit) but they are not body entities.
965 if not Is_Child_Unit
(E
) then
966 Set_Is_Package_Body_Entity
(E
);
973 Check_References
(Body_Id
);
975 -- For a generic unit, check that the formal parameters are referenced,
976 -- and that local variables are used, as for regular packages.
978 if Ekind
(Spec_Id
) = E_Generic_Package
then
979 Check_References
(Spec_Id
);
982 -- At this point all entities of the package body are externally visible
983 -- to the linker as their Is_Public flag is set to True. This proactive
984 -- approach is necessary because an inlined or a generic body for which
985 -- code is generated in other units may need to see these entities. Cut
986 -- down the number of global symbols that do not neet public visibility
987 -- as this has two beneficial effects:
988 -- (1) It makes the compilation process more efficient.
989 -- (2) It gives the code generator more leeway to optimize within each
990 -- unit, especially subprograms.
992 -- This is done only for top-level library packages or child units as
993 -- the algorithm does a top-down traversal of the package body.
995 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
996 and then not Is_Generic_Unit
(Spec_Id
)
998 Hide_Public_Entities
(Declarations
(N
));
1001 -- If expander is not active, then here is where we turn off the
1002 -- In_Package_Body flag, otherwise it is turned off at the end of the
1003 -- corresponding expansion routine. If this is an instance body, we need
1004 -- to qualify names of local entities, because the body may have been
1005 -- compiled as a preliminary to another instantiation.
1007 if not Expander_Active
then
1008 Set_In_Package_Body
(Spec_Id
, False);
1010 if Is_Generic_Instance
(Spec_Id
)
1011 and then Operating_Mode
= Generate_Code
1013 Qualify_Entity_Names
(N
);
1017 Ignore_SPARK_Mode_Pragmas_In_Instance
:= Saved_ISMP
;
1018 Restore_Ghost_Mode
(Saved_GM
);
1019 end Analyze_Package_Body_Helper
;
1021 ---------------------------------
1022 -- Analyze_Package_Declaration --
1023 ---------------------------------
1025 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
1026 Id
: constant Node_Id
:= Defining_Entity
(N
);
1028 Is_Comp_Unit
: constant Boolean :=
1029 Nkind
(Parent
(N
)) = N_Compilation_Unit
;
1031 Body_Required
: Boolean;
1032 -- True when this package declaration requires a corresponding body
1035 if Debug_Flag_C
then
1036 Write_Str
("==> package spec ");
1037 Write_Name
(Chars
(Id
));
1038 Write_Str
(" from ");
1039 Write_Location
(Sloc
(N
));
1044 Generate_Definition
(Id
);
1046 Set_Ekind
(Id
, E_Package
);
1047 Set_Etype
(Id
, Standard_Void_Type
);
1049 -- Set SPARK_Mode from context
1051 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
1052 Set_SPARK_Aux_Pragma
(Id
, SPARK_Mode_Pragma
);
1053 Set_SPARK_Pragma_Inherited
(Id
);
1054 Set_SPARK_Aux_Pragma_Inherited
(Id
);
1056 -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in case
1057 -- the body of this package is instantiated or inlined later and out of
1058 -- context. The body uses this attribute to restore the value of the
1061 if Ignore_SPARK_Mode_Pragmas_In_Instance
then
1062 Set_Ignore_SPARK_Mode_Pragmas
(Id
);
1065 -- Analyze aspect specifications immediately, since we need to recognize
1066 -- things like Pure early enough to diagnose violations during analysis.
1068 if Has_Aspects
(N
) then
1069 Analyze_Aspect_Specifications
(N
, Id
);
1072 -- Ada 2005 (AI-217): Check if the package has been illegally named in
1073 -- a limited-with clause of its own context. In this case the error has
1074 -- been previously notified by Analyze_Context.
1076 -- limited with Pkg; -- ERROR
1077 -- package Pkg is ...
1079 if From_Limited_With
(Id
) then
1085 Set_Is_Pure
(Id
, Is_Pure
(Enclosing_Lib_Unit_Entity
));
1086 Set_Categorization_From_Pragmas
(N
);
1088 Analyze
(Specification
(N
));
1089 Validate_Categorization_Dependency
(N
, Id
);
1091 -- Determine whether the package requires a body. Abstract states are
1092 -- intentionally ignored because they do require refinement which can
1093 -- only come in a body, but at the same time they do not force the need
1094 -- for a body on their own (SPARK RM 7.1.4(4) and 7.2.2(3)).
1096 Body_Required
:= Unit_Requires_Body
(Id
);
1098 if not Body_Required
then
1100 -- If the package spec does not require an explicit body, then there
1101 -- are not entities requiring completion in the language sense. Call
1102 -- Check_Completion now to ensure that nested package declarations
1103 -- that require an implicit body get one. (In the case where a body
1104 -- is required, Check_Completion is called at the end of the body's
1105 -- declarative part.)
1109 -- If the package spec does not require an explicit body, then all
1110 -- abstract states declared in nested packages cannot possibly get
1111 -- a proper refinement (SPARK RM 7.2.2(3)). This check is performed
1112 -- only when the compilation unit is the main unit to allow for
1113 -- modular SPARK analysis where packages do not necessarily have
1116 if Is_Comp_Unit
then
1117 Check_State_Refinements
1119 Is_Main_Unit
=> Parent
(N
) = Cunit
(Main_Unit
));
1123 if Is_Comp_Unit
then
1125 -- Set Body_Required indication on the compilation unit node, and
1126 -- determine whether elaboration warnings may be meaningful on it.
1128 Set_Body_Required
(Parent
(N
), Body_Required
);
1130 if not Body_Required
then
1131 Set_Suppress_Elaboration_Warnings
(Id
);
1135 End_Package_Scope
(Id
);
1137 -- For the declaration of a library unit that is a remote types package,
1138 -- check legality rules regarding availability of stream attributes for
1139 -- types that contain non-remote access values. This subprogram performs
1140 -- visibility tests that rely on the fact that we have exited the scope
1143 if Is_Comp_Unit
then
1144 Validate_RT_RAT_Component
(N
);
1147 if Debug_Flag_C
then
1149 Write_Str
("<== package spec ");
1150 Write_Name
(Chars
(Id
));
1151 Write_Str
(" from ");
1152 Write_Location
(Sloc
(N
));
1155 end Analyze_Package_Declaration
;
1157 -----------------------------------
1158 -- Analyze_Package_Specification --
1159 -----------------------------------
1161 -- Note that this code is shared for the analysis of generic package specs
1162 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
1164 procedure Analyze_Package_Specification
(N
: Node_Id
) is
1165 Id
: constant Entity_Id
:= Defining_Entity
(N
);
1166 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
1167 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
1168 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
1171 Public_Child
: Boolean;
1173 Private_With_Clauses_Installed
: Boolean := False;
1174 -- In Ada 2005, private with_clauses are visible in the private part
1175 -- of a nested package, even if it appears in the public part of the
1176 -- enclosing package. This requires a separate step to install these
1177 -- private_with_clauses, and remove them at the end of the nested
1180 procedure Check_One_Tagged_Type_Or_Extension_At_Most
;
1181 -- Issue an error in SPARK mode if a package specification contains
1182 -- more than one tagged type or type extension.
1184 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
1185 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
1186 -- Is_True_Constant) on all variables that are entities of Id, and on
1187 -- the chain whose first element is FE. A recursive call is made for all
1188 -- packages and generic packages.
1190 procedure Generate_Parent_References
;
1191 -- For a child unit, generate references to parent units, for
1192 -- GPS navigation purposes.
1194 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
1195 -- Child and Unit are entities of compilation units. True if Child
1196 -- is a public child of Parent as defined in 10.1.1
1198 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
1199 -- Reject completion of an incomplete or private type declarations
1200 -- having a known discriminant part by an unchecked union.
1202 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
1203 -- Given the package entity of a generic package instantiation or
1204 -- formal package whose corresponding generic is a child unit, installs
1205 -- the private declarations of each of the child unit's parents.
1206 -- This has to be done at the point of entering the instance package's
1207 -- private part rather than being done in Sem_Ch12.Install_Parent
1208 -- (which is where the parents' visible declarations are installed).
1210 ------------------------------------------------
1211 -- Check_One_Tagged_Type_Or_Extension_At_Most --
1212 ------------------------------------------------
1214 procedure Check_One_Tagged_Type_Or_Extension_At_Most
is
1217 procedure Check_Decls
(Decls
: List_Id
);
1218 -- Check that either Previous is Empty and Decls does not contain
1219 -- more than one tagged type or type extension, or Previous is
1220 -- already set and Decls contains no tagged type or type extension.
1226 procedure Check_Decls
(Decls
: List_Id
) is
1230 Decl
:= First
(Decls
);
1231 while Present
(Decl
) loop
1232 if Nkind
(Decl
) = N_Full_Type_Declaration
1233 and then Is_Tagged_Type
(Defining_Identifier
(Decl
))
1235 if No
(Previous
) then
1239 Error_Msg_Sloc
:= Sloc
(Previous
);
1240 Check_SPARK_05_Restriction
1241 ("at most one tagged type or type extension allowed",
1242 "\\ previous declaration#",
1251 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
1255 Check_Decls
(Vis_Decls
);
1257 if Present
(Priv_Decls
) then
1258 Check_Decls
(Priv_Decls
);
1260 end Check_One_Tagged_Type_Or_Extension_At_Most
;
1262 ---------------------
1263 -- Clear_Constants --
1264 ---------------------
1266 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
1270 -- Ignore package renamings, not interesting and they can cause self
1271 -- referential loops in the code below.
1273 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
1277 -- Note: in the loop below, the check for Next_Entity pointing back
1278 -- to the package entity may seem odd, but it is needed, because a
1279 -- package can contain a renaming declaration to itself, and such
1280 -- renamings are generated automatically within package instances.
1283 while Present
(E
) and then E
/= Id
loop
1284 if Is_Assignable
(E
) then
1285 Set_Never_Set_In_Source
(E
, False);
1286 Set_Is_True_Constant
(E
, False);
1287 Set_Current_Value
(E
, Empty
);
1288 Set_Is_Known_Null
(E
, False);
1289 Set_Last_Assignment
(E
, Empty
);
1291 if not Can_Never_Be_Null
(E
) then
1292 Set_Is_Known_Non_Null
(E
, False);
1295 elsif Is_Package_Or_Generic_Package
(E
) then
1296 Clear_Constants
(E
, First_Entity
(E
));
1297 Clear_Constants
(E
, First_Private_Entity
(E
));
1302 end Clear_Constants
;
1304 --------------------------------
1305 -- Generate_Parent_References --
1306 --------------------------------
1308 procedure Generate_Parent_References
is
1309 Decl
: constant Node_Id
:= Parent
(N
);
1312 if Id
= Cunit_Entity
(Main_Unit
)
1313 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
1315 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1317 elsif not Nkind_In
(Unit
(Cunit
(Main_Unit
)), N_Subprogram_Body
,
1320 -- If current unit is an ancestor of main unit, generate a
1321 -- reference to its own parent.
1325 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
1328 if Nkind
(Main_Spec
) = N_Package_Body
then
1329 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
1332 U
:= Parent_Spec
(Main_Spec
);
1333 while Present
(U
) loop
1334 if U
= Parent
(Decl
) then
1335 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1338 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
1342 U
:= Parent_Spec
(Unit
(U
));
1347 end Generate_Parent_References
;
1349 ---------------------
1350 -- Is_Public_Child --
1351 ---------------------
1353 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
1355 if not Is_Private_Descendant
(Child
) then
1358 if Child
= Unit
then
1359 return not Private_Present
(
1360 Parent
(Unit_Declaration_Node
(Child
)));
1362 return Is_Public_Child
(Scope
(Child
), Unit
);
1365 end Is_Public_Child
;
1367 ----------------------------------------
1368 -- Inspect_Unchecked_Union_Completion --
1369 ----------------------------------------
1371 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
1375 Decl
:= First
(Decls
);
1376 while Present
(Decl
) loop
1378 -- We are looking at an incomplete or private type declaration
1379 -- with a known_discriminant_part whose full view is an
1382 if Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
1383 N_Private_Type_Declaration
)
1384 and then Has_Discriminants
(Defining_Identifier
(Decl
))
1385 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
1387 Is_Unchecked_Union
(Full_View
(Defining_Identifier
(Decl
)))
1390 ("completion of discriminated partial view "
1391 & "cannot be an unchecked union",
1392 Full_View
(Defining_Identifier
(Decl
)));
1397 end Inspect_Unchecked_Union_Completion
;
1399 -----------------------------------------
1400 -- Install_Parent_Private_Declarations --
1401 -----------------------------------------
1403 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
1404 Inst_Par
: Entity_Id
;
1405 Gen_Par
: Entity_Id
;
1406 Inst_Node
: Node_Id
;
1409 Inst_Par
:= Inst_Id
;
1412 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
1413 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
1414 Inst_Node
:= Get_Unit_Instantiation_Node
(Inst_Par
);
1416 if Nkind_In
(Inst_Node
, N_Package_Instantiation
,
1417 N_Formal_Package_Declaration
)
1418 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
1420 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
1422 if Present
(Renamed_Entity
(Inst_Par
)) then
1423 Inst_Par
:= Renamed_Entity
(Inst_Par
);
1428 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
1430 -- Install the private declarations and private use clauses
1431 -- of a parent instance of the child instance, unless the
1432 -- parent instance private declarations have already been
1433 -- installed earlier in Analyze_Package_Specification, which
1434 -- happens when a generic child is instantiated, and the
1435 -- instance is a child of the parent instance.
1437 -- Installing the use clauses of the parent instance twice
1438 -- is both unnecessary and wrong, because it would cause the
1439 -- clauses to be chained to themselves in the use clauses
1440 -- list of the scope stack entry. That in turn would cause
1441 -- an endless loop from End_Use_Clauses upon scope exit.
1443 -- The parent is now fully visible. It may be a hidden open
1444 -- scope if we are currently compiling some child instance
1445 -- declared within it, but while the current instance is being
1446 -- compiled the parent is immediately visible. In particular
1447 -- its entities must remain visible if a stack save/restore
1448 -- takes place through a call to Rtsfind.
1450 if Present
(Gen_Par
) then
1451 if not In_Private_Part
(Inst_Par
) then
1452 Install_Private_Declarations
(Inst_Par
);
1453 Set_Use
(Private_Declarations
1455 (Unit_Declaration_Node
(Inst_Par
))));
1456 Set_Is_Hidden_Open_Scope
(Inst_Par
, False);
1459 -- If we've reached the end of the generic instance parents,
1460 -- then finish off by looping through the nongeneric parents
1461 -- and installing their private declarations.
1463 -- If one of the non-generic parents is itself on the scope
1464 -- stack, do not install its private declarations: they are
1465 -- installed in due time when the private part of that parent
1469 while Present
(Inst_Par
)
1470 and then Inst_Par
/= Standard_Standard
1471 and then (not In_Open_Scopes
(Inst_Par
)
1472 or else not In_Private_Part
(Inst_Par
))
1474 if Nkind
(Inst_Node
) = N_Formal_Package_Declaration
1476 not Is_Ancestor_Package
1477 (Inst_Par
, Cunit_Entity
(Current_Sem_Unit
))
1479 Install_Private_Declarations
(Inst_Par
);
1481 (Private_Declarations
1483 (Unit_Declaration_Node
(Inst_Par
))));
1484 Inst_Par
:= Scope
(Inst_Par
);
1497 end Install_Parent_Private_Declarations
;
1499 -- Start of processing for Analyze_Package_Specification
1502 if Present
(Vis_Decls
) then
1503 Analyze_Declarations
(Vis_Decls
);
1506 -- Inspect the entities defined in the package and ensure that all
1507 -- incomplete types have received full declarations. Build default
1508 -- initial condition and invariant procedures for all qualifying types.
1510 E
:= First_Entity
(Id
);
1511 while Present
(E
) loop
1513 -- Check on incomplete types
1515 -- AI05-0213: A formal incomplete type has no completion, and neither
1516 -- does the corresponding subtype in an instance.
1518 if Is_Incomplete_Type
(E
)
1519 and then No
(Full_View
(E
))
1520 and then not Is_Generic_Type
(E
)
1521 and then not From_Limited_With
(E
)
1522 and then not Is_Generic_Actual_Type
(E
)
1524 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
1530 if Is_Remote_Call_Interface
(Id
)
1531 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
1533 Validate_RCI_Declarations
(Id
);
1536 -- Save global references in the visible declarations, before installing
1537 -- private declarations of parent unit if there is one, because the
1538 -- privacy status of types defined in the parent will change. This is
1539 -- only relevant for generic child units, but is done in all cases for
1542 if Ekind
(Id
) = E_Generic_Package
1543 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1546 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1547 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1550 -- Insert the freezing nodes after the visible declarations to
1551 -- ensure that we analyze its aspects; needed to ensure that
1552 -- global entities referenced in the aspects are properly handled.
1554 if Ada_Version
>= Ada_2012
1555 and then Is_Non_Empty_List
(Vis_Decls
)
1556 and then Is_Empty_List
(Priv_Decls
)
1558 Insert_List_After_And_Analyze
1559 (Last
(Vis_Decls
), Freeze_Entity
(Id
, Last
(Vis_Decls
)));
1562 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1563 Save_Global_References
(Orig_Decl
);
1564 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1568 -- If package is a public child unit, then make the private declarations
1569 -- of the parent visible.
1571 Public_Child
:= False;
1575 Pack_Decl
: Node_Id
;
1580 Par_Spec
:= Parent_Spec
(Parent
(N
));
1582 -- If the package is formal package of an enclosing generic, it is
1583 -- transformed into a local generic declaration, and compiled to make
1584 -- its spec available. We need to retrieve the original generic to
1585 -- determine whether it is a child unit, and install its parents.
1589 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1591 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1592 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1595 if Present
(Par_Spec
) then
1596 Generate_Parent_References
;
1598 while Scope
(Par
) /= Standard_Standard
1599 and then Is_Public_Child
(Id
, Par
)
1600 and then In_Open_Scopes
(Par
)
1602 Public_Child
:= True;
1604 Install_Private_Declarations
(Par
);
1605 Install_Private_With_Clauses
(Par
);
1606 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1607 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1612 if Is_Compilation_Unit
(Id
) then
1613 Install_Private_With_Clauses
(Id
);
1615 -- The current compilation unit may include private with_clauses,
1616 -- which are visible in the private part of the current nested
1617 -- package, and have to be installed now. This is not done for
1618 -- nested instantiations, where the private with_clauses of the
1619 -- enclosing unit have no effect once the instantiation info is
1620 -- established and we start analyzing the package declaration.
1623 Comp_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
1625 if Is_Package_Or_Generic_Package
(Comp_Unit
)
1626 and then not In_Private_Part
(Comp_Unit
)
1627 and then not In_Instance
1629 Install_Private_With_Clauses
(Comp_Unit
);
1630 Private_With_Clauses_Installed
:= True;
1635 -- If this is a package associated with a generic instance or formal
1636 -- package, then the private declarations of each of the generic's
1637 -- parents must be installed at this point.
1639 if Is_Generic_Instance
(Id
) then
1640 Install_Parent_Private_Declarations
(Id
);
1643 -- Analyze private part if present. The flag In_Private_Part is reset
1644 -- in End_Package_Scope.
1646 L
:= Last_Entity
(Id
);
1648 if Present
(Priv_Decls
) then
1649 Set_In_Private_Part
(Id
);
1651 -- Upon entering a public child's private part, it may be necessary
1652 -- to declare subprograms that were derived in the package's visible
1653 -- part but not yet made visible.
1655 if Public_Child
then
1656 Declare_Inherited_Private_Subprograms
(Id
);
1659 Analyze_Declarations
(Priv_Decls
);
1661 -- Check the private declarations for incomplete deferred constants
1663 Inspect_Deferred_Constant_Completion
(Priv_Decls
);
1665 -- The first private entity is the immediate follower of the last
1666 -- visible entity, if there was one.
1669 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1671 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
1674 -- There may be inherited private subprograms that need to be declared,
1675 -- even in the absence of an explicit private part. If there are any
1676 -- public declarations in the package and the package is a public child
1677 -- unit, then an implicit private part is assumed.
1679 elsif Present
(L
) and then Public_Child
then
1680 Set_In_Private_Part
(Id
);
1681 Declare_Inherited_Private_Subprograms
(Id
);
1682 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1685 E
:= First_Entity
(Id
);
1686 while Present
(E
) loop
1688 -- Check rule of 3.6(11), which in general requires waiting till all
1689 -- full types have been seen.
1691 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1692 Check_Aliased_Component_Types
(E
);
1695 -- Check preelaborable initialization for full type completing a
1696 -- private type for which pragma Preelaborable_Initialization given.
1699 and then Must_Have_Preelab_Init
(E
)
1700 and then not Has_Preelaborable_Initialization
(E
)
1703 ("full view of & does not have preelaborable initialization", E
);
1709 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1710 -- declaration having a known_discriminant_part shall not be an
1711 -- unchecked union type.
1713 if Present
(Vis_Decls
) then
1714 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1717 if Present
(Priv_Decls
) then
1718 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1721 if Ekind
(Id
) = E_Generic_Package
1722 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1723 and then Present
(Priv_Decls
)
1725 -- Save global references in private declarations, ignoring the
1726 -- visible declarations that were processed earlier.
1729 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1730 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1731 Save_Form
: constant List_Id
:=
1732 Generic_Formal_Declarations
(Orig_Decl
);
1735 -- Insert the freezing nodes after the private declarations to
1736 -- ensure that we analyze its aspects; needed to ensure that
1737 -- global entities referenced in the aspects are properly handled.
1739 if Ada_Version
>= Ada_2012
1740 and then Is_Non_Empty_List
(Priv_Decls
)
1742 Insert_List_After_And_Analyze
1743 (Last
(Priv_Decls
), Freeze_Entity
(Id
, Last
(Priv_Decls
)));
1746 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1747 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1748 Save_Global_References
(Orig_Decl
);
1749 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1750 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1754 Process_End_Label
(N
, 'e', Id
);
1756 -- Remove private_with_clauses of enclosing compilation unit, if they
1759 if Private_With_Clauses_Installed
then
1760 Remove_Private_With_Clauses
(Cunit
(Current_Sem_Unit
));
1763 -- For the case of a library level package, we must go through all the
1764 -- entities clearing the indications that the value may be constant and
1765 -- not modified. Why? Because any client of this package may modify
1766 -- these values freely from anywhere. This also applies to any nested
1767 -- packages or generic packages.
1769 -- For now we unconditionally clear constants for packages that are
1770 -- instances of generic packages. The reason is that we do not have the
1771 -- body yet, and we otherwise think things are unreferenced when they
1772 -- are not. This should be fixed sometime (the effect is not terrible,
1773 -- we just lose some warnings, and also some cases of value propagation)
1776 if Is_Library_Level_Entity
(Id
)
1777 or else Is_Generic_Instance
(Id
)
1779 Clear_Constants
(Id
, First_Entity
(Id
));
1780 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1783 -- Issue an error in SPARK mode if a package specification contains
1784 -- more than one tagged type or type extension.
1786 Check_One_Tagged_Type_Or_Extension_At_Most
;
1788 -- Output relevant information as to why the package requires a body.
1789 -- Do not consider generated packages as this exposes internal symbols
1790 -- and leads to confusing messages.
1792 if List_Body_Required_Info
1793 and then In_Extended_Main_Source_Unit
(Id
)
1794 and then Unit_Requires_Body
(Id
)
1795 and then Comes_From_Source
(Id
)
1797 Unit_Requires_Body_Info
(Id
);
1799 end Analyze_Package_Specification
;
1801 --------------------------------------
1802 -- Analyze_Private_Type_Declaration --
1803 --------------------------------------
1805 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1806 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1807 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1810 Generate_Definition
(Id
);
1811 Set_Is_Pure
(Id
, PF
);
1812 Init_Size_Align
(Id
);
1814 if not Is_Package_Or_Generic_Package
(Current_Scope
)
1815 or else In_Private_Part
(Current_Scope
)
1817 Error_Msg_N
("invalid context for private declaration", N
);
1820 New_Private_Type
(N
, Id
, N
);
1821 Set_Depends_On_Private
(Id
);
1823 if Has_Aspects
(N
) then
1824 Analyze_Aspect_Specifications
(N
, Id
);
1826 end Analyze_Private_Type_Declaration
;
1828 ----------------------------------
1829 -- Check_Anonymous_Access_Types --
1830 ----------------------------------
1832 procedure Check_Anonymous_Access_Types
1833 (Spec_Id
: Entity_Id
;
1840 -- Itype references are only needed by gigi, to force elaboration of
1841 -- itypes. In the absence of code generation, they are not needed.
1843 if not Expander_Active
then
1847 E
:= First_Entity
(Spec_Id
);
1848 while Present
(E
) loop
1849 if Ekind
(E
) = E_Anonymous_Access_Type
1850 and then From_Limited_With
(E
)
1852 IR
:= Make_Itype_Reference
(Sloc
(P_Body
));
1855 if No
(Declarations
(P_Body
)) then
1856 Set_Declarations
(P_Body
, New_List
(IR
));
1858 Prepend
(IR
, Declarations
(P_Body
));
1864 end Check_Anonymous_Access_Types
;
1866 -------------------------------------------
1867 -- Declare_Inherited_Private_Subprograms --
1868 -------------------------------------------
1870 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1872 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1873 -- Check whether an inherited subprogram S is an operation of an
1874 -- untagged derived type T.
1876 ---------------------
1877 -- Is_Primitive_Of --
1878 ---------------------
1880 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1884 -- If the full view is a scalar type, the type is the anonymous base
1885 -- type, but the operation mentions the first subtype, so check the
1886 -- signature against the base type.
1888 if Base_Type
(Etype
(S
)) = Base_Type
(T
) then
1892 Formal
:= First_Formal
(S
);
1893 while Present
(Formal
) loop
1894 if Base_Type
(Etype
(Formal
)) = Base_Type
(T
) then
1898 Next_Formal
(Formal
);
1903 end Is_Primitive_Of
;
1910 Op_Elmt_2
: Elmt_Id
;
1911 Prim_Op
: Entity_Id
;
1912 New_Op
: Entity_Id
:= Empty
;
1913 Parent_Subp
: Entity_Id
;
1916 -- Start of processing for Declare_Inherited_Private_Subprograms
1919 E
:= First_Entity
(Id
);
1920 while Present
(E
) loop
1922 -- If the entity is a nonprivate type extension whose parent type
1923 -- is declared in an open scope, then the type may have inherited
1924 -- operations that now need to be made visible. Ditto if the entity
1925 -- is a formal derived type in a child unit.
1927 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1929 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1930 and then Is_Generic_Type
(E
)))
1931 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1932 and then Is_Base_Type
(E
)
1934 if Is_Tagged_Type
(E
) then
1935 Op_List
:= Primitive_Operations
(E
);
1937 Tag
:= First_Tag_Component
(E
);
1939 Op_Elmt
:= First_Elmt
(Op_List
);
1940 while Present
(Op_Elmt
) loop
1941 Prim_Op
:= Node
(Op_Elmt
);
1943 -- Search primitives that are implicit operations with an
1944 -- internal name whose parent operation has a normal name.
1946 if Present
(Alias
(Prim_Op
))
1947 and then Find_Dispatching_Type
(Alias
(Prim_Op
)) /= E
1948 and then not Comes_From_Source
(Prim_Op
)
1949 and then Is_Internal_Name
(Chars
(Prim_Op
))
1950 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1952 Parent_Subp
:= Alias
(Prim_Op
);
1954 -- Case 1: Check if the type has also an explicit
1955 -- overriding for this primitive.
1957 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1958 while Present
(Op_Elmt_2
) loop
1960 -- Skip entities with attribute Interface_Alias since
1961 -- they are not overriding primitives (these entities
1962 -- link an interface primitive with their covering
1965 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
1966 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
1967 and then No
(Interface_Alias
(Node
(Op_Elmt_2
)))
1969 -- The private inherited operation has been
1970 -- overridden by an explicit subprogram:
1971 -- replace the former by the latter.
1973 New_Op
:= Node
(Op_Elmt_2
);
1974 Replace_Elmt
(Op_Elmt
, New_Op
);
1975 Remove_Elmt
(Op_List
, Op_Elmt_2
);
1976 Set_Overridden_Operation
(New_Op
, Parent_Subp
);
1978 -- We don't need to inherit its dispatching slot.
1979 -- Set_All_DT_Position has previously ensured that
1980 -- the same slot was assigned to the two primitives
1983 and then Present
(DTC_Entity
(New_Op
))
1984 and then Present
(DTC_Entity
(Prim_Op
))
1987 (DT_Position
(New_Op
) = DT_Position
(Prim_Op
));
1991 goto Next_Primitive
;
1994 Next_Elmt
(Op_Elmt_2
);
1997 -- Case 2: We have not found any explicit overriding and
1998 -- hence we need to declare the operation (i.e., make it
2001 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
2003 -- Inherit the dispatching slot if E is already frozen
2006 and then Present
(DTC_Entity
(Alias
(Prim_Op
)))
2008 Set_DTC_Entity_Value
(E
, New_Op
);
2009 Set_DT_Position_Value
(New_Op
,
2010 DT_Position
(Alias
(Prim_Op
)));
2014 (Is_Dispatching_Operation
(New_Op
)
2015 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
2017 -- Substitute the new operation for the old one in the
2018 -- type's primitive operations list. Since the new
2019 -- operation was also just added to the end of list,
2020 -- the last element must be removed.
2022 -- (Question: is there a simpler way of declaring the
2023 -- operation, say by just replacing the name of the
2024 -- earlier operation, reentering it in the in the symbol
2025 -- table (how?), and marking it as private???)
2027 Replace_Elmt
(Op_Elmt
, New_Op
);
2028 Remove_Last_Elmt
(Op_List
);
2032 Next_Elmt
(Op_Elmt
);
2035 -- Generate listing showing the contents of the dispatch table
2037 if Debug_Flag_ZZ
then
2042 -- For untagged type, scan forward to locate inherited hidden
2045 Prim_Op
:= Next_Entity
(E
);
2046 while Present
(Prim_Op
) loop
2047 if Is_Subprogram
(Prim_Op
)
2048 and then Present
(Alias
(Prim_Op
))
2049 and then not Comes_From_Source
(Prim_Op
)
2050 and then Is_Internal_Name
(Chars
(Prim_Op
))
2051 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
2052 and then Is_Primitive_Of
(E
, Prim_Op
)
2054 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
2057 Next_Entity
(Prim_Op
);
2059 -- Derived operations appear immediately after the type
2060 -- declaration (or the following subtype indication for
2061 -- a derived scalar type). Further declarations cannot
2062 -- include inherited operations of the type.
2064 if Present
(Prim_Op
) then
2065 exit when Ekind
(Prim_Op
) not in Overloadable_Kind
;
2073 end Declare_Inherited_Private_Subprograms
;
2075 -----------------------
2076 -- End_Package_Scope --
2077 -----------------------
2079 procedure End_Package_Scope
(P
: Entity_Id
) is
2081 Uninstall_Declarations
(P
);
2083 end End_Package_Scope
;
2085 ---------------------------
2086 -- Exchange_Declarations --
2087 ---------------------------
2089 procedure Exchange_Declarations
(Id
: Entity_Id
) is
2090 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
2091 H1
: constant Entity_Id
:= Homonym
(Id
);
2092 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
2097 -- If missing full declaration for type, nothing to exchange
2099 if No
(Full_Id
) then
2103 -- Otherwise complete the exchange, and preserve semantic links
2105 Next2
:= Next_Entity
(Full_Id
);
2106 H2
:= Homonym
(Full_Id
);
2108 -- Reset full declaration pointer to reflect the switched entities and
2109 -- readjust the next entity chains.
2111 Exchange_Entities
(Id
, Full_Id
);
2113 Set_Next_Entity
(Id
, Next1
);
2114 Set_Homonym
(Id
, H1
);
2116 Set_Full_View
(Full_Id
, Id
);
2117 Set_Next_Entity
(Full_Id
, Next2
);
2118 Set_Homonym
(Full_Id
, H2
);
2119 end Exchange_Declarations
;
2121 ----------------------------
2122 -- Install_Package_Entity --
2123 ----------------------------
2125 procedure Install_Package_Entity
(Id
: Entity_Id
) is
2127 if not Is_Internal
(Id
) then
2128 if Debug_Flag_E
then
2129 Write_Str
("Install: ");
2130 Write_Name
(Chars
(Id
));
2134 if Is_Child_Unit
(Id
) then
2137 -- Do not enter implicitly inherited non-overridden subprograms of
2138 -- a tagged type back into visibility if they have non-conformant
2139 -- homographs (Ada RM 8.3 12.3/2).
2141 elsif Is_Hidden_Non_Overridden_Subpgm
(Id
) then
2145 Set_Is_Immediately_Visible
(Id
);
2148 end Install_Package_Entity
;
2150 ----------------------------------
2151 -- Install_Private_Declarations --
2152 ----------------------------------
2154 procedure Install_Private_Declarations
(P
: Entity_Id
) is
2157 Priv_Deps
: Elist_Id
;
2159 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
);
2160 -- When the full view of a private type is made available, we do the
2161 -- same for its private dependents under proper visibility conditions.
2162 -- When compiling a grand-chid unit this needs to be done recursively.
2164 -----------------------------
2165 -- Swap_Private_Dependents --
2166 -----------------------------
2168 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
) is
2171 Priv_Elmt
: Elmt_Id
;
2175 Priv_Elmt
:= First_Elmt
(Priv_Deps
);
2176 while Present
(Priv_Elmt
) loop
2177 Priv
:= Node
(Priv_Elmt
);
2179 -- Before the exchange, verify that the presence of the Full_View
2180 -- field. This field will be empty if the entity has already been
2181 -- installed due to a previous call.
2183 if Present
(Full_View
(Priv
)) and then Is_Visible_Dependent
(Priv
)
2185 if Is_Private_Type
(Priv
) then
2186 Deps
:= Private_Dependents
(Priv
);
2192 -- For each subtype that is swapped, we also swap the reference
2193 -- to it in Private_Dependents, to allow access to it when we
2194 -- swap them out in End_Package_Scope.
2196 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
2198 -- Ensure that both views of the dependent private subtype are
2199 -- immediately visible if within some open scope. Check full
2200 -- view before exchanging views.
2202 if In_Open_Scopes
(Scope
(Full_View
(Priv
))) then
2203 Set_Is_Immediately_Visible
(Priv
);
2206 Exchange_Declarations
(Priv
);
2207 Set_Is_Immediately_Visible
2208 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
2210 Set_Is_Potentially_Use_Visible
2211 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
2213 -- Within a child unit, recurse, except in generic child unit,
2214 -- which (unfortunately) handle private_dependents separately.
2217 and then Is_Child_Unit
(Cunit_Entity
(Current_Sem_Unit
))
2218 and then not Is_Empty_Elmt_List
(Deps
)
2219 and then not Inside_A_Generic
2221 Swap_Private_Dependents
(Deps
);
2225 Next_Elmt
(Priv_Elmt
);
2227 end Swap_Private_Dependents
;
2229 -- Start of processing for Install_Private_Declarations
2232 -- First exchange declarations for private types, so that the full
2233 -- declaration is visible. For each private type, we check its
2234 -- Private_Dependents list and also exchange any subtypes of or derived
2235 -- types from it. Finally, if this is a Taft amendment type, the
2236 -- incomplete declaration is irrelevant, and we want to link the
2237 -- eventual full declaration with the original private one so we
2238 -- also skip the exchange.
2240 Id
:= First_Entity
(P
);
2241 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2242 if Is_Private_Base_Type
(Id
)
2243 and then Present
(Full_View
(Id
))
2244 and then Comes_From_Source
(Full_View
(Id
))
2245 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
2246 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
2248 -- If there is a use-type clause on the private type, set the full
2249 -- view accordingly.
2251 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
2252 Full
:= Full_View
(Id
);
2254 if Is_Private_Base_Type
(Full
)
2255 and then Has_Private_Declaration
(Full
)
2256 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
2257 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
2258 and then In_Package_Body
(Current_Scope
)
2259 and then not Is_Private_Type
(Etype
(Full
))
2261 -- This is the completion of a private type by a derivation
2262 -- from another private type which is not private anymore. This
2263 -- can only happen in a package nested within a child package,
2264 -- when the parent type is defined in the parent unit. At this
2265 -- point the current type is not private either, and we have
2266 -- to install the underlying full view, which is now visible.
2267 -- Save the current full view as well, so that all views can be
2268 -- restored on exit. It may seem that after compiling the child
2269 -- body there are not environments to restore, but the back-end
2270 -- expects those links to be valid, and freeze nodes depend on
2273 if No
(Full_View
(Full
))
2274 and then Present
(Underlying_Full_View
(Full
))
2276 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
2277 Set_Underlying_Full_View
(Id
, Full
);
2278 Set_Is_Underlying_Full_View
(Full
);
2280 Set_Underlying_Full_View
(Full
, Empty
);
2281 Set_Is_Frozen
(Full_View
(Id
));
2285 Priv_Deps
:= Private_Dependents
(Id
);
2286 Exchange_Declarations
(Id
);
2287 Set_Is_Immediately_Visible
(Id
);
2288 Swap_Private_Dependents
(Priv_Deps
);
2294 -- Next make other declarations in the private part visible as well
2296 Id
:= First_Private_Entity
(P
);
2297 while Present
(Id
) loop
2298 Install_Package_Entity
(Id
);
2299 Set_Is_Hidden
(Id
, False);
2303 -- An abstract state is partially refined when it has at least one
2304 -- Part_Of constituent. Since these constituents are being installed
2305 -- into visibility, update the partial refinement status of any state
2306 -- defined in the associated package, subject to at least one Part_Of
2309 if Ekind_In
(P
, E_Generic_Package
, E_Package
) then
2311 States
: constant Elist_Id
:= Abstract_States
(P
);
2312 State_Elmt
: Elmt_Id
;
2313 State_Id
: Entity_Id
;
2316 if Present
(States
) then
2317 State_Elmt
:= First_Elmt
(States
);
2318 while Present
(State_Elmt
) loop
2319 State_Id
:= Node
(State_Elmt
);
2321 if Present
(Part_Of_Constituents
(State_Id
)) then
2322 Set_Has_Partial_Visible_Refinement
(State_Id
);
2325 Next_Elmt
(State_Elmt
);
2331 -- Indicate that the private part is currently visible, so it can be
2332 -- properly reset on exit.
2334 Set_In_Private_Part
(P
);
2335 end Install_Private_Declarations
;
2337 ----------------------------------
2338 -- Install_Visible_Declarations --
2339 ----------------------------------
2341 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
2343 Last_Entity
: Entity_Id
;
2347 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
2349 if Is_Package_Or_Generic_Package
(P
) then
2350 Last_Entity
:= First_Private_Entity
(P
);
2352 Last_Entity
:= Empty
;
2355 Id
:= First_Entity
(P
);
2356 while Present
(Id
) and then Id
/= Last_Entity
loop
2357 Install_Package_Entity
(Id
);
2360 end Install_Visible_Declarations
;
2362 --------------------------
2363 -- Is_Private_Base_Type --
2364 --------------------------
2366 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
2368 return Ekind
(E
) = E_Private_Type
2369 or else Ekind
(E
) = E_Limited_Private_Type
2370 or else Ekind
(E
) = E_Record_Type_With_Private
;
2371 end Is_Private_Base_Type
;
2373 --------------------------
2374 -- Is_Visible_Dependent --
2375 --------------------------
2377 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
2379 S
: constant Entity_Id
:= Scope
(Dep
);
2382 -- Renamings created for actual types have the visibility of the actual
2384 if Ekind
(S
) = E_Package
2385 and then Is_Generic_Instance
(S
)
2386 and then (Is_Generic_Actual_Type
(Dep
)
2387 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
2391 elsif not (Is_Derived_Type
(Dep
))
2392 and then Is_Derived_Type
(Full_View
(Dep
))
2394 -- When instantiating a package body, the scope stack is empty, so
2395 -- check instead whether the dependent type is defined in the same
2396 -- scope as the instance itself.
2398 return In_Open_Scopes
(S
)
2399 or else (Is_Generic_Instance
(Current_Scope
)
2400 and then Scope
(Dep
) = Scope
(Current_Scope
));
2404 end Is_Visible_Dependent
;
2406 ----------------------------
2407 -- May_Need_Implicit_Body --
2408 ----------------------------
2410 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
2411 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
2412 S
: constant Node_Id
:= Parent
(P
);
2417 if not Has_Completion
(E
)
2418 and then Nkind
(P
) = N_Package_Declaration
2419 and then (Present
(Activation_Chain_Entity
(P
)) or else Has_RACW
(E
))
2422 Make_Package_Body
(Sloc
(E
),
2423 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
2424 Chars
=> Chars
(E
)),
2425 Declarations
=> New_List
);
2427 if Nkind
(S
) = N_Package_Specification
then
2428 if Present
(Private_Declarations
(S
)) then
2429 Decls
:= Private_Declarations
(S
);
2431 Decls
:= Visible_Declarations
(S
);
2434 Decls
:= Declarations
(S
);
2440 end May_Need_Implicit_Body
;
2442 ----------------------
2443 -- New_Private_Type --
2444 ----------------------
2446 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
2448 -- For other than Ada 2012, enter the name in the current scope
2450 if Ada_Version
< Ada_2012
then
2453 -- Ada 2012 (AI05-0162): Enter the name in the current scope. Note that
2454 -- there may be an incomplete previous view.
2460 Prev
:= Find_Type_Name
(N
);
2461 pragma Assert
(Prev
= Id
2462 or else (Ekind
(Prev
) = E_Incomplete_Type
2463 and then Present
(Full_View
(Prev
))
2464 and then Full_View
(Prev
) = Id
));
2468 if Limited_Present
(Def
) then
2469 Set_Ekind
(Id
, E_Limited_Private_Type
);
2471 Set_Ekind
(Id
, E_Private_Type
);
2475 Set_Has_Delayed_Freeze
(Id
);
2476 Set_Is_First_Subtype
(Id
);
2477 Init_Size_Align
(Id
);
2479 Set_Is_Constrained
(Id
,
2480 No
(Discriminant_Specifications
(N
))
2481 and then not Unknown_Discriminants_Present
(N
));
2483 -- Set tagged flag before processing discriminants, to catch illegal
2486 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
2488 Set_Discriminant_Constraint
(Id
, No_Elist
);
2489 Set_Stored_Constraint
(Id
, No_Elist
);
2491 if Present
(Discriminant_Specifications
(N
)) then
2493 Process_Discriminants
(N
);
2496 elsif Unknown_Discriminants_Present
(N
) then
2497 Set_Has_Unknown_Discriminants
(Id
);
2500 Set_Private_Dependents
(Id
, New_Elmt_List
);
2502 if Tagged_Present
(Def
) then
2503 Set_Ekind
(Id
, E_Record_Type_With_Private
);
2504 Set_Direct_Primitive_Operations
(Id
, New_Elmt_List
);
2505 Set_Is_Abstract_Type
(Id
, Abstract_Present
(Def
));
2506 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
2507 Set_Has_Delayed_Freeze
(Id
, True);
2509 -- Recognize Ada.Real_Time.Timing_Events.Timing_Events here
2511 if Is_RTE
(Id
, RE_Timing_Event
) then
2512 Set_Has_Timing_Event
(Id
);
2515 -- Create a class-wide type with the same attributes
2517 Make_Class_Wide_Type
(Id
);
2519 elsif Abstract_Present
(Def
) then
2520 Error_Msg_N
("only a tagged type can be abstract", N
);
2522 end New_Private_Type
;
2524 ---------------------------------
2525 -- Requires_Completion_In_Body --
2526 ---------------------------------
2528 function Requires_Completion_In_Body
2530 Pack_Id
: Entity_Id
;
2531 Do_Abstract_States
: Boolean := False) return Boolean
2534 -- Always ignore child units. Child units get added to the entity list
2535 -- of a parent unit, but are not original entities of the parent, and
2536 -- so do not affect whether the parent needs a body.
2538 if Is_Child_Unit
(Id
) then
2541 -- Ignore formal packages and their renamings
2543 elsif Ekind
(Id
) = E_Package
2544 and then Nkind
(Original_Node
(Unit_Declaration_Node
(Id
))) =
2545 N_Formal_Package_Declaration
2549 -- Otherwise test to see if entity requires a completion. Note that
2550 -- subprogram entities whose declaration does not come from source are
2551 -- ignored here on the basis that we assume the expander will provide an
2552 -- implicit completion at some point.
2554 elsif (Is_Overloadable
(Id
)
2555 and then not Ekind_In
(Id
, E_Enumeration_Literal
, E_Operator
)
2556 and then not Is_Abstract_Subprogram
(Id
)
2557 and then not Has_Completion
(Id
)
2558 and then Comes_From_Source
(Parent
(Id
)))
2561 (Ekind
(Id
) = E_Package
2562 and then Id
/= Pack_Id
2563 and then not Has_Completion
(Id
)
2564 and then Unit_Requires_Body
(Id
, Do_Abstract_States
))
2567 (Ekind
(Id
) = E_Incomplete_Type
2568 and then No
(Full_View
(Id
))
2569 and then not Is_Generic_Type
(Id
))
2572 (Ekind_In
(Id
, E_Task_Type
, E_Protected_Type
)
2573 and then not Has_Completion
(Id
))
2576 (Ekind
(Id
) = E_Generic_Package
2577 and then Id
/= Pack_Id
2578 and then not Has_Completion
(Id
)
2579 and then Unit_Requires_Body
(Id
, Do_Abstract_States
))
2582 (Is_Generic_Subprogram
(Id
)
2583 and then not Has_Completion
(Id
))
2587 -- Otherwise the entity does not require completion in a package body
2592 end Requires_Completion_In_Body
;
2594 ----------------------------
2595 -- Uninstall_Declarations --
2596 ----------------------------
2598 procedure Uninstall_Declarations
(P
: Entity_Id
) is
2599 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
2602 Priv_Elmt
: Elmt_Id
;
2603 Priv_Sub
: Entity_Id
;
2605 procedure Preserve_Full_Attributes
(Priv
: Entity_Id
; Full
: Entity_Id
);
2606 -- Copy to the private declaration the attributes of the full view that
2607 -- need to be available for the partial view also.
2609 function Type_In_Use
(T
: Entity_Id
) return Boolean;
2610 -- Check whether type or base type appear in an active use_type clause
2612 ------------------------------
2613 -- Preserve_Full_Attributes --
2614 ------------------------------
2616 procedure Preserve_Full_Attributes
2620 Full_Base
: constant Entity_Id
:= Base_Type
(Full
);
2621 Priv_Is_Base_Type
: constant Boolean := Is_Base_Type
(Priv
);
2624 Set_Size_Info
(Priv
, Full
);
2625 Set_RM_Size
(Priv
, RM_Size
(Full
));
2626 Set_Size_Known_At_Compile_Time
2627 (Priv
, Size_Known_At_Compile_Time
(Full
));
2628 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
2629 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
2630 Set_Is_Ada_2005_Only
(Priv
, Is_Ada_2005_Only
(Full
));
2631 Set_Is_Ada_2012_Only
(Priv
, Is_Ada_2012_Only
(Full
));
2632 Set_Has_Pragma_Unmodified
(Priv
, Has_Pragma_Unmodified
(Full
));
2633 Set_Has_Pragma_Unreferenced
(Priv
, Has_Pragma_Unreferenced
(Full
));
2634 Set_Has_Pragma_Unreferenced_Objects
2635 (Priv
, Has_Pragma_Unreferenced_Objects
2637 if Is_Unchecked_Union
(Full
) then
2638 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
2640 -- Why is atomic not copied here ???
2642 if Referenced
(Full
) then
2643 Set_Referenced
(Priv
);
2646 if Priv_Is_Base_Type
then
2647 Set_Is_Controlled
(Priv
, Is_Controlled
(Full_Base
));
2648 Set_Finalize_Storage_Only
2649 (Priv
, Finalize_Storage_Only
(Full_Base
));
2650 Set_Has_Controlled_Component
2651 (Priv
, Has_Controlled_Component
(Full_Base
));
2653 Propagate_Concurrent_Flags
(Priv
, Base_Type
(Full
));
2656 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
2658 -- Propagate Default_Initial_Condition-related attributes from the
2659 -- base type of the full view to the full view and vice versa. This
2660 -- may seem strange, but is necessary depending on which type
2661 -- triggered the generation of the DIC procedure body. As a result,
2662 -- both the full view and its base type carry the same DIC-related
2665 Propagate_DIC_Attributes
(Full
, From_Typ
=> Full_Base
);
2666 Propagate_DIC_Attributes
(Full_Base
, From_Typ
=> Full
);
2668 -- Propagate Default_Initial_Condition-related attributes from the
2669 -- full view to the private view.
2671 Propagate_DIC_Attributes
(Priv
, From_Typ
=> Full
);
2673 -- Propagate invariant-related attributes from the base type of the
2674 -- full view to the full view and vice versa. This may seem strange,
2675 -- but is necessary depending on which type triggered the generation
2676 -- of the invariant procedure body. As a result, both the full view
2677 -- and its base type carry the same invariant-related information.
2679 Propagate_Invariant_Attributes
(Full
, From_Typ
=> Full_Base
);
2680 Propagate_Invariant_Attributes
(Full_Base
, From_Typ
=> Full
);
2682 -- Propagate invariant-related attributes from the full view to the
2685 Propagate_Invariant_Attributes
(Priv
, From_Typ
=> Full
);
2687 if Is_Tagged_Type
(Priv
)
2688 and then Is_Tagged_Type
(Full
)
2689 and then not Error_Posted
(Full
)
2691 if Is_Tagged_Type
(Priv
) then
2693 -- If the type is tagged, the tag itself must be available on
2694 -- the partial view, for expansion purposes.
2696 Set_First_Entity
(Priv
, First_Entity
(Full
));
2698 -- If there are discriminants in the partial view, these remain
2699 -- visible. Otherwise only the tag itself is visible, and there
2700 -- are no nameable components in the partial view.
2702 if No
(Last_Entity
(Priv
)) then
2703 Set_Last_Entity
(Priv
, First_Entity
(Priv
));
2707 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
2709 if Has_Discriminants
(Full
) then
2710 Set_Discriminant_Constraint
(Priv
,
2711 Discriminant_Constraint
(Full
));
2714 end Preserve_Full_Attributes
;
2720 function Type_In_Use
(T
: Entity_Id
) return Boolean is
2722 return Scope
(Base_Type
(T
)) = P
2723 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
2726 -- Start of processing for Uninstall_Declarations
2729 Id
:= First_Entity
(P
);
2730 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2731 if Debug_Flag_E
then
2732 Write_Str
("unlinking visible entity ");
2733 Write_Int
(Int
(Id
));
2737 -- On exit from the package scope, we must preserve the visibility
2738 -- established by use clauses in the current scope. Two cases:
2740 -- a) If the entity is an operator, it may be a primitive operator of
2741 -- a type for which there is a visible use-type clause.
2743 -- b) for other entities, their use-visibility is determined by a
2744 -- visible use clause for the package itself. For a generic instance,
2745 -- the instantiation of the formals appears in the visible part,
2746 -- but the formals are private and remain so.
2748 if Ekind
(Id
) = E_Function
2749 and then Is_Operator_Symbol_Name
(Chars
(Id
))
2750 and then not Is_Hidden
(Id
)
2751 and then not Error_Posted
(Id
)
2753 Set_Is_Potentially_Use_Visible
(Id
,
2755 or else Type_In_Use
(Etype
(Id
))
2756 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
2757 or else (Present
(Next_Formal
(First_Formal
(Id
)))
2760 (Etype
(Next_Formal
(First_Formal
(Id
))))));
2762 if In_Use
(P
) and then not Is_Hidden
(Id
) then
2764 -- A child unit of a use-visible package remains use-visible
2765 -- only if it is itself a visible child unit. Otherwise it
2766 -- would remain visible in other contexts where P is use-
2767 -- visible, because once compiled it stays in the entity list
2768 -- of its parent unit.
2770 if Is_Child_Unit
(Id
) then
2771 Set_Is_Potentially_Use_Visible
2772 (Id
, Is_Visible_Lib_Unit
(Id
));
2774 Set_Is_Potentially_Use_Visible
(Id
);
2778 Set_Is_Potentially_Use_Visible
(Id
, False);
2782 -- Local entities are not immediately visible outside of the package
2784 Set_Is_Immediately_Visible
(Id
, False);
2786 -- If this is a private type with a full view (for example a local
2787 -- subtype of a private type declared elsewhere), ensure that the
2788 -- full view is also removed from visibility: it may be exposed when
2789 -- swapping views in an instantiation. Similarly, ensure that the
2790 -- use-visibility is properly set on both views.
2792 if Is_Type
(Id
) and then Present
(Full_View
(Id
)) then
2793 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
2794 Set_Is_Potentially_Use_Visible
(Full_View
(Id
),
2795 Is_Potentially_Use_Visible
(Id
));
2798 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2799 Check_Abstract_Overriding
(Id
);
2800 Check_Conventions
(Id
);
2803 if Ekind_In
(Id
, E_Private_Type
, E_Limited_Private_Type
)
2804 and then No
(Full_View
(Id
))
2805 and then not Is_Generic_Type
(Id
)
2806 and then not Is_Derived_Type
(Id
)
2808 Error_Msg_N
("missing full declaration for private type&", Id
);
2810 elsif Ekind
(Id
) = E_Record_Type_With_Private
2811 and then not Is_Generic_Type
(Id
)
2812 and then No
(Full_View
(Id
))
2814 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
2815 Error_Msg_N
("missing full declaration for private type&", Id
);
2818 ("missing full declaration for private extension", Id
);
2821 -- Case of constant, check for deferred constant declaration with
2822 -- no full view. Likely just a matter of a missing expression, or
2823 -- accidental use of the keyword constant.
2825 elsif Ekind
(Id
) = E_Constant
2827 -- OK if constant value present
2829 and then No
(Constant_Value
(Id
))
2831 -- OK if full view present
2833 and then No
(Full_View
(Id
))
2835 -- OK if imported, since that provides the completion
2837 and then not Is_Imported
(Id
)
2839 -- OK if object declaration replaced by renaming declaration as
2840 -- a result of OK_To_Rename processing (e.g. for concatenation)
2842 and then Nkind
(Parent
(Id
)) /= N_Object_Renaming_Declaration
2844 -- OK if object declaration with the No_Initialization flag set
2846 and then not (Nkind
(Parent
(Id
)) = N_Object_Declaration
2847 and then No_Initialization
(Parent
(Id
)))
2849 -- If no private declaration is present, we assume the user did
2850 -- not intend a deferred constant declaration and the problem
2851 -- is simply that the initializing expression is missing.
2853 if not Has_Private_Declaration
(Etype
(Id
)) then
2855 -- We assume that the user did not intend a deferred constant
2856 -- declaration, and the expression is just missing.
2859 ("constant declaration requires initialization expression",
2862 if Is_Limited_Type
(Etype
(Id
)) then
2864 ("\if variable intended, remove CONSTANT from declaration",
2868 -- Otherwise if a private declaration is present, then we are
2869 -- missing the full declaration for the deferred constant.
2873 ("missing full declaration for deferred constant (RM 7.4)",
2876 if Is_Limited_Type
(Etype
(Id
)) then
2878 ("\if variable intended, remove CONSTANT from declaration",
2887 -- If the specification was installed as the parent of a public child
2888 -- unit, the private declarations were not installed, and there is
2891 if not In_Private_Part
(P
) then
2894 Set_In_Private_Part
(P
, False);
2897 -- Make private entities invisible and exchange full and private
2898 -- declarations for private types. Id is now the first private entity
2901 while Present
(Id
) loop
2902 if Debug_Flag_E
then
2903 Write_Str
("unlinking private entity ");
2904 Write_Int
(Int
(Id
));
2908 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2909 Check_Abstract_Overriding
(Id
);
2910 Check_Conventions
(Id
);
2913 Set_Is_Immediately_Visible
(Id
, False);
2915 if Is_Private_Base_Type
(Id
) and then Present
(Full_View
(Id
)) then
2916 Full
:= Full_View
(Id
);
2918 -- If the partial view is not declared in the visible part of the
2919 -- package (as is the case when it is a type derived from some
2920 -- other private type in the private part of the current package),
2921 -- no exchange takes place.
2924 or else List_Containing
(Parent
(Id
)) /=
2925 Visible_Declarations
(Specification
(Decl
))
2930 -- The entry in the private part points to the full declaration,
2931 -- which is currently visible. Exchange them so only the private
2932 -- type declaration remains accessible, and link private and full
2933 -- declaration in the opposite direction. Before the actual
2934 -- exchange, we copy back attributes of the full view that must
2935 -- be available to the partial view too.
2937 Preserve_Full_Attributes
(Id
, Full
);
2939 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
2941 -- The following test may be redundant, as this is already
2942 -- diagnosed in sem_ch3. ???
2944 if not Is_Definite_Subtype
(Full
)
2945 and then Is_Definite_Subtype
(Id
)
2947 Error_Msg_Sloc
:= Sloc
(Parent
(Id
));
2949 ("full view of& not compatible with declaration#", Full
, Id
);
2952 -- Swap out the subtypes and derived types of Id that
2953 -- were compiled in this scope, or installed previously
2954 -- by Install_Private_Declarations.
2956 -- Before we do the swap, we verify the presence of the Full_View
2957 -- field which may be empty due to a swap by a previous call to
2958 -- End_Package_Scope (e.g. from the freezing mechanism).
2960 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2961 while Present
(Priv_Elmt
) loop
2962 Priv_Sub
:= Node
(Priv_Elmt
);
2964 if Present
(Full_View
(Priv_Sub
)) then
2965 if Scope
(Priv_Sub
) = P
2966 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
2968 Set_Is_Immediately_Visible
(Priv_Sub
, False);
2971 if Is_Visible_Dependent
(Priv_Sub
) then
2972 Preserve_Full_Attributes
2973 (Priv_Sub
, Full_View
(Priv_Sub
));
2974 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
2975 Exchange_Declarations
(Priv_Sub
);
2979 Next_Elmt
(Priv_Elmt
);
2982 -- Now restore the type itself to its private view
2984 Exchange_Declarations
(Id
);
2986 -- If we have installed an underlying full view for a type derived
2987 -- from a private type in a child unit, restore the proper views
2988 -- of private and full view. See corresponding code in
2989 -- Install_Private_Declarations.
2991 -- After the exchange, Full denotes the private type in the
2992 -- visible part of the package.
2994 if Is_Private_Base_Type
(Full
)
2995 and then Present
(Full_View
(Full
))
2996 and then Present
(Underlying_Full_View
(Full
))
2997 and then In_Package_Body
(Current_Scope
)
2999 Set_Full_View
(Full
, Underlying_Full_View
(Full
));
3000 Set_Underlying_Full_View
(Full
, Empty
);
3003 elsif Ekind
(Id
) = E_Incomplete_Type
3004 and then Comes_From_Source
(Id
)
3005 and then No
(Full_View
(Id
))
3007 -- Mark Taft amendment types. Verify that there are no primitive
3008 -- operations declared for the type (3.10.1(9)).
3010 Set_Has_Completion_In_Body
(Id
);
3017 Elmt
:= First_Elmt
(Private_Dependents
(Id
));
3018 while Present
(Elmt
) loop
3019 Subp
:= Node
(Elmt
);
3021 -- Is_Primitive is tested because there can be cases where
3022 -- nonprimitive subprograms (in nested packages) are added
3023 -- to the Private_Dependents list.
3025 if Is_Overloadable
(Subp
) and then Is_Primitive
(Subp
) then
3027 ("type& must be completed in the private part",
3030 -- The result type of an access-to-function type cannot be a
3031 -- Taft-amendment type, unless the version is Ada 2012 or
3032 -- later (see AI05-151).
3034 elsif Ada_Version
< Ada_2012
3035 and then Ekind
(Subp
) = E_Subprogram_Type
3037 if Etype
(Subp
) = Id
3039 (Is_Class_Wide_Type
(Etype
(Subp
))
3040 and then Etype
(Etype
(Subp
)) = Id
)
3043 ("type& must be completed in the private part",
3044 Associated_Node_For_Itype
(Subp
), Id
);
3052 elsif not Is_Child_Unit
(Id
)
3053 and then (not Is_Private_Type
(Id
) or else No
(Full_View
(Id
)))
3056 Set_Is_Potentially_Use_Visible
(Id
, False);
3062 end Uninstall_Declarations
;
3064 ------------------------
3065 -- Unit_Requires_Body --
3066 ------------------------
3068 function Unit_Requires_Body
3069 (Pack_Id
: Entity_Id
;
3070 Do_Abstract_States
: Boolean := False) return Boolean
3074 Requires_Body
: Boolean := False;
3075 -- Flag set when the unit has at least one construct that requries
3076 -- completion in a body.
3079 -- Imported entity never requires body. Right now, only subprograms can
3080 -- be imported, but perhaps in the future we will allow import of
3083 if Is_Imported
(Pack_Id
) then
3086 -- Body required if library package with pragma Elaborate_Body
3088 elsif Has_Pragma_Elaborate_Body
(Pack_Id
) then
3091 -- Body required if subprogram
3093 elsif Is_Subprogram_Or_Generic_Subprogram
(Pack_Id
) then
3096 -- Treat a block as requiring a body
3098 elsif Ekind
(Pack_Id
) = E_Block
then
3101 elsif Ekind
(Pack_Id
) = E_Package
3102 and then Nkind
(Parent
(Pack_Id
)) = N_Package_Specification
3103 and then Present
(Generic_Parent
(Parent
(Pack_Id
)))
3106 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(Pack_Id
));
3108 if Has_Pragma_Elaborate_Body
(G_P
) then
3114 -- Traverse the entity chain of the package and look for constructs that
3115 -- require a completion in a body.
3117 E
:= First_Entity
(Pack_Id
);
3118 while Present
(E
) loop
3120 -- Skip abstract states because their completion depends on several
3121 -- criteria (see below).
3123 if Ekind
(E
) = E_Abstract_State
then
3126 elsif Requires_Completion_In_Body
3127 (E
, Pack_Id
, Do_Abstract_States
)
3129 Requires_Body
:= True;
3136 -- A [generic] package that defines at least one non-null abstract state
3137 -- requires a completion only when at least one other construct requires
3138 -- a completion in a body (SPARK RM 7.1.4(4) and (6)). This check is not
3139 -- performed if the caller requests this behavior.
3141 if Do_Abstract_States
3142 and then Ekind_In
(Pack_Id
, E_Generic_Package
, E_Package
)
3143 and then Has_Non_Null_Abstract_State
(Pack_Id
)
3144 and then Requires_Body
3149 return Requires_Body
;
3150 end Unit_Requires_Body
;
3152 -----------------------------
3153 -- Unit_Requires_Body_Info --
3154 -----------------------------
3156 procedure Unit_Requires_Body_Info
(Pack_Id
: Entity_Id
) is
3160 -- An imported entity never requires body. Right now, only subprograms
3161 -- can be imported, but perhaps in the future we will allow import of
3164 if Is_Imported
(Pack_Id
) then
3167 -- Body required if library package with pragma Elaborate_Body
3169 elsif Has_Pragma_Elaborate_Body
(Pack_Id
) then
3170 Error_Msg_N
("info: & requires body (Elaborate_Body)?Y?", Pack_Id
);
3172 -- Body required if subprogram
3174 elsif Is_Subprogram_Or_Generic_Subprogram
(Pack_Id
) then
3175 Error_Msg_N
("info: & requires body (subprogram case)?Y?", Pack_Id
);
3177 -- Body required if generic parent has Elaborate_Body
3179 elsif Ekind
(Pack_Id
) = E_Package
3180 and then Nkind
(Parent
(Pack_Id
)) = N_Package_Specification
3181 and then Present
(Generic_Parent
(Parent
(Pack_Id
)))
3184 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(Pack_Id
));
3186 if Has_Pragma_Elaborate_Body
(G_P
) then
3188 ("info: & requires body (generic parent Elaborate_Body)?Y?",
3193 -- A [generic] package that introduces at least one non-null abstract
3194 -- state requires completion. However, there is a separate rule that
3195 -- requires that such a package have a reason other than this for a
3196 -- body being required (if necessary a pragma Elaborate_Body must be
3197 -- provided). If Ignore_Abstract_State is True, we don't do this check
3198 -- (so we can use Unit_Requires_Body to check for some other reason).
3200 elsif Ekind_In
(Pack_Id
, E_Generic_Package
, E_Package
)
3201 and then Present
(Abstract_States
(Pack_Id
))
3202 and then not Is_Null_State
3203 (Node
(First_Elmt
(Abstract_States
(Pack_Id
))))
3206 ("info: & requires body (non-null abstract state aspect)?Y?",
3210 -- Otherwise search entity chain for entity requiring completion
3212 E
:= First_Entity
(Pack_Id
);
3213 while Present
(E
) loop
3214 if Requires_Completion_In_Body
(E
, Pack_Id
) then
3215 Error_Msg_Node_2
:= E
;
3217 ("info: & requires body (& requires completion)?Y?", E
, Pack_Id
);
3222 end Unit_Requires_Body_Info
;