1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2003, 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 -- This package contains the routines to process package specifications and
28 -- bodies. The most important semantic aspects of package processing are the
29 -- handling of private and full declarations, and the construction of
30 -- dispatch tables for tagged types.
32 with Atree
; use Atree
;
33 with Debug
; use Debug
;
34 with Einfo
; use Einfo
;
35 with Elists
; use Elists
;
36 with Errout
; use Errout
;
37 with Exp_Disp
; use Exp_Disp
;
38 with Exp_Dbug
; use Exp_Dbug
;
40 with Lib
.Xref
; use Lib
.Xref
;
41 with Namet
; use Namet
;
42 with Nmake
; use Nmake
;
43 with Nlists
; use Nlists
;
45 with Output
; use Output
;
47 with Sem_Cat
; use Sem_Cat
;
48 with Sem_Ch3
; use Sem_Ch3
;
49 with Sem_Ch6
; use Sem_Ch6
;
50 with Sem_Ch8
; use Sem_Ch8
;
51 with Sem_Ch12
; use Sem_Ch12
;
52 with Sem_Util
; use Sem_Util
;
53 with Sem_Warn
; use Sem_Warn
;
54 with Snames
; use Snames
;
55 with Stand
; use Stand
;
56 with Sinfo
; use Sinfo
;
57 with Sinput
; use Sinput
;
60 package body Sem_Ch7
is
62 -----------------------------------
63 -- Handling private declarations --
64 -----------------------------------
66 -- The principle that each entity has a single defining occurrence clashes
67 -- with the presence of two separate definitions for private types: the
68 -- first is the private type declaration, and the second is the full type
69 -- declaration. It is important that all references to the type point to
70 -- the same defining occurrence, namely the first one. To enforce the two
71 -- separate views of the entity, the corresponding information is swapped
72 -- between the two declarations. Outside of the package, the defining
73 -- occurrence only contains the private declaration information, while in
74 -- the private part and the body of the package the defining occurrence
75 -- contains the full declaration. To simplify the swap, the defining
76 -- occurrence that currently holds the private declaration points to the
77 -- full declaration. During semantic processing the defining occurrence
78 -- also points to a list of private dependents, that is to say access types
79 -- or composite types whose designated types or component types are
80 -- subtypes or derived types of the private type in question. After the
81 -- full declaration has been seen, the private dependents are updated to
82 -- indicate that they have full definitions.
84 -----------------------
85 -- Local Subprograms --
86 -----------------------
88 procedure Install_Package_Entity
(Id
: Entity_Id
);
89 -- Basic procedure for the previous two. Places one entity on its
90 -- visibility chain, and recurses on the visible part if the entity
91 -- is an inner package.
93 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
94 -- True for a private type that is not a subtype.
96 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
97 -- If the private dependent is a private type whose full view is
98 -- derived from the parent type, its full properties are revealed
99 -- only if we are in the immediate scope of the private dependent.
100 -- Should this predicate be tightened further???
102 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
103 -- Called upon entering the private part of a public child package
104 -- and the body of a nested package, to potentially declare certain
105 -- inherited subprograms that were inherited by types in the visible
106 -- part, but whose declaration was deferred because the parent
107 -- operation was private and not visible at that point. These
108 -- subprograms are located by traversing the visible part declarations
109 -- looking for non-private type extensions and then examining each of
110 -- the primitive operations of such types to find those that were
111 -- inherited but declared with a special internal name. Each such
112 -- operation is now declared as an operation with a normal name (using
113 -- the name of the parent operation) and replaces the previous implicit
114 -- operation in the primitive operations list of the type. If the
115 -- inherited private operation has been overridden, then it's
116 -- replaced by the overriding operation.
118 --------------------------
119 -- Analyze_Package_Body --
120 --------------------------
122 procedure Analyze_Package_Body
(N
: Node_Id
) is
123 Loc
: constant Source_Ptr
:= Sloc
(N
);
127 Last_Spec_Entity
: Entity_Id
;
131 procedure Install_Composite_Operations
(P
: Entity_Id
);
132 -- Composite types declared in the current scope may depend on
133 -- types that were private at the point of declaration, and whose
134 -- full view is now in scope. Indicate that the corresponding
135 -- operations on the composite type are available.
137 ----------------------------------
138 -- Install_Composite_Operations --
139 ----------------------------------
141 procedure Install_Composite_Operations
(P
: Entity_Id
) is
145 Id
:= First_Entity
(P
);
147 while Present
(Id
) loop
150 and then (Is_Limited_Composite
(Id
)
151 or else Is_Private_Composite
(Id
))
152 and then No
(Private_Component
(Id
))
154 Set_Is_Limited_Composite
(Id
, False);
155 Set_Is_Private_Composite
(Id
, False);
160 end Install_Composite_Operations
;
162 -- Start of processing for Analyze_Package_Body
165 -- Find corresponding package specification, and establish the
166 -- current scope. The visible defining entity for the package is the
167 -- defining occurrence in the spec. On exit from the package body, all
168 -- body declarations are attached to the defining entity for the body,
169 -- but the later is never used for name resolution. In this fashion
170 -- there is only one visible entity that denotes the package.
173 Write_Str
("==== Compiling package body ");
174 Write_Name
(Chars
(Defining_Entity
(N
)));
175 Write_Str
(" from ");
176 Write_Location
(Loc
);
180 -- Set Body_Id. Note that this Will be reset to point to the
181 -- generic copy later on in the generic case.
183 Body_Id
:= Defining_Entity
(N
);
185 if Present
(Corresponding_Spec
(N
)) then
187 -- Body is body of package instantiation. Corresponding spec
188 -- has already been set.
190 Spec_Id
:= Corresponding_Spec
(N
);
191 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
194 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
197 and then Is_Package
(Spec_Id
)
199 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
201 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
202 Error_Msg_N
("cannot supply body for package renaming", N
);
205 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
206 Error_Msg_N
("redefinition of package body", N
);
211 Error_Msg_N
("missing specification for package body", N
);
215 if Is_Package
(Spec_Id
)
217 (Scope
(Spec_Id
) = Standard_Standard
218 or else Is_Child_Unit
(Spec_Id
))
219 and then not Unit_Requires_Body
(Spec_Id
)
223 ("optional package body (not allowed in Ada 95)?", N
);
226 ("spec of this package does not allow a body", N
);
231 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
232 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
234 if Is_Child_Unit
(Spec_Id
) then
235 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
237 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
240 Set_Is_Child_Unit
(Body_Id
);
243 -- Generic package case
245 if Ekind
(Spec_Id
) = E_Generic_Package
then
247 -- Disable expansion and perform semantic analysis on copy.
248 -- The unannotated body will be used in all instantiations.
250 Body_Id
:= Defining_Entity
(N
);
251 Set_Ekind
(Body_Id
, E_Package_Body
);
252 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
253 Set_Body_Entity
(Spec_Id
, Body_Id
);
254 Set_Spec_Entity
(Body_Id
, Spec_Id
);
256 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
259 -- Update Body_Id to point to the copied node for the remainder
260 -- of the processing.
262 Body_Id
:= Defining_Entity
(N
);
266 -- The Body_Id is that of the copied node in the generic case, the
267 -- current node otherwise. Note that N was rewritten above, so we
268 -- must be sure to get the latest Body_Id value.
270 Set_Ekind
(Body_Id
, E_Package_Body
);
271 Set_Body_Entity
(Spec_Id
, Body_Id
);
272 Set_Spec_Entity
(Body_Id
, Spec_Id
);
274 -- Defining name for the package body is not a visible entity: Only
275 -- the defining name for the declaration is visible.
277 Set_Etype
(Body_Id
, Standard_Void_Type
);
278 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
279 Set_Corresponding_Spec
(N
, Spec_Id
);
280 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
282 -- The body entity is not used for semantics or code generation, but
283 -- it is attached to the entity list of the enclosing scope to simplify
284 -- the listing of back-annotations for the types it main contain.
286 if Scope
(Spec_Id
) /= Standard_Standard
then
287 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
290 -- Indicate that we are currently compiling the body of the package.
292 Set_In_Package_Body
(Spec_Id
);
293 Set_Has_Completion
(Spec_Id
);
294 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
298 Set_Categorization_From_Pragmas
(N
);
300 Install_Visible_Declarations
(Spec_Id
);
301 Install_Private_Declarations
(Spec_Id
);
302 Install_Composite_Operations
(Spec_Id
);
304 if Ekind
(Spec_Id
) = E_Generic_Package
then
305 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
308 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
309 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
311 -- This is a nested package, so it may be necessary to declare
312 -- certain inherited subprograms that are not yet visible because
313 -- the parent type's subprograms are now visible.
315 if Ekind
(Scope
(Spec_Id
)) = E_Package
316 and then Scope
(Spec_Id
) /= Standard_Standard
318 Declare_Inherited_Private_Subprograms
(Spec_Id
);
321 if Present
(Declarations
(N
)) then
322 Analyze_Declarations
(Declarations
(N
));
325 HSS
:= Handled_Statement_Sequence
(N
);
327 if Present
(HSS
) then
328 Process_End_Label
(HSS
, 't', Spec_Id
);
331 -- Check that elaboration code in a preelaborable package body is
332 -- empty other than null statements and labels (RM 10.2.1(6)).
334 Validate_Null_Statement_Sequence
(N
);
337 Validate_Categorization_Dependency
(N
, Spec_Id
);
338 Check_Completion
(Body_Id
);
340 -- Generate start of body reference. Note that we do this fairly late,
341 -- because the call will use In_Extended_Main_Source_Unit as a check,
342 -- and we want to make sure that Corresponding_Stub links are set
344 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
346 -- For a generic package, collect global references and mark
347 -- them on the original body so that they are not resolved
348 -- again at the point of instantiation.
350 if Ekind
(Spec_Id
) /= E_Package
then
351 Save_Global_References
(Original_Node
(N
));
355 -- The entities of the package body have so far been chained onto
356 -- the declaration chain for the spec. That's been fine while we
357 -- were in the body, since we wanted them to be visible, but now
358 -- that we are leaving the package body, they are no longer visible,
359 -- so we remove them from the entity chain of the package spec entity,
360 -- and copy them to the entity chain of the package body entity, where
361 -- they will never again be visible.
363 if Present
(Last_Spec_Entity
) then
364 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
365 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
366 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
367 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
370 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
371 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
372 Set_First_Entity
(Spec_Id
, Empty
);
373 Set_Last_Entity
(Spec_Id
, Empty
);
376 End_Package_Scope
(Spec_Id
);
378 -- All entities declared in body are not visible.
384 E
:= First_Entity
(Body_Id
);
386 while Present
(E
) loop
387 Set_Is_Immediately_Visible
(E
, False);
388 Set_Is_Potentially_Use_Visible
(E
, False);
391 -- Child units may appear on the entity list (for example if
392 -- they appear in the context of a subunit) but they are not
395 if not Is_Child_Unit
(E
) then
396 Set_Is_Package_Body_Entity
(E
);
403 Check_References
(Body_Id
);
405 -- For a generic unit, check that the formal parameters are referenced,
406 -- and that local variables are used, as for regular packages.
408 if Ekind
(Spec_Id
) = E_Generic_Package
then
409 Check_References
(Spec_Id
);
412 -- The processing so far has made all entities of the package body
413 -- public (i.e. externally visible to the linker). This is in general
414 -- necessary, since inlined or generic bodies, for which code is
415 -- generated in other units, may need to see these entities. The
416 -- following loop runs backwards from the end of the entities of the
417 -- package body making these entities invisible until we reach a
418 -- referencer, i.e. a declaration that could reference a previous
419 -- declaration, a generic body or an inlined body, or a stub (which
420 -- may contain either of these). This is of course an approximation,
421 -- but it is conservative and definitely correct.
423 -- We only do this at the outer (library) level non-generic packages.
424 -- The reason is simply to cut down on the number of external symbols
425 -- generated, so this is simply an optimization of the efficiency
426 -- of the compilation process. It has no other effect.
428 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
429 and then not Is_Generic_Unit
(Spec_Id
)
430 and then Present
(Declarations
(N
))
432 Make_Non_Public_Where_Possible
: declare
434 function Has_Referencer
438 -- Traverse the given list of declarations in reverse order.
439 -- Return True as soon as a referencer is reached. Return
440 -- False if none is found. The Outer parameter is True for
441 -- the outer level call, and False for inner level calls for
442 -- nested packages. If Outer is True, then any entities up
443 -- to the point of hitting a referencer get their Is_Public
444 -- flag cleared, so that the entities will be treated as
445 -- static entities in the C sense, and need not have fully
446 -- qualified names. For inner levels, we need all names to
447 -- be fully qualified to deal with the same name appearing
448 -- in parallel packages (right now this is tied to their
455 function Has_Referencer
472 while Present
(D
) loop
475 if K
in N_Body_Stub
then
478 elsif K
= N_Subprogram_Body
then
479 if Acts_As_Spec
(D
) then
480 E
:= Defining_Entity
(D
);
482 -- An inlined body acts as a referencer. Note also
483 -- that we never reset Is_Public for an inlined
484 -- subprogram. Gigi requires Is_Public to be set.
486 -- Note that we test Has_Pragma_Inline here rather
487 -- than Is_Inlined. We are compiling this for a
488 -- client, and it is the client who will decide
489 -- if actual inlining should occur, so we need to
490 -- assume that the procedure could be inlined for
491 -- the purpose of accessing global entities.
493 if Has_Pragma_Inline
(E
) then
496 Set_Is_Public
(E
, False);
500 E
:= Corresponding_Spec
(D
);
503 and then (Is_Generic_Unit
(E
)
504 or else Has_Pragma_Inline
(E
)
505 or else Is_Inlined
(E
))
511 -- Processing for package bodies
513 elsif K
= N_Package_Body
514 and then Present
(Corresponding_Spec
(D
))
516 E
:= Corresponding_Spec
(D
);
518 -- Generic package body is a referencer. It would
519 -- seem that we only have to consider generics that
520 -- can be exported, i.e. where the corresponding spec
521 -- is the spec of the current package, but because of
522 -- nested instantiations, a fully private generic
523 -- body may export other private body entities.
525 if Is_Generic_Unit
(E
) then
528 -- For non-generic package body, recurse into body
529 -- unless this is an instance, we ignore instances
530 -- since they cannot have references that affect
533 elsif not Is_Generic_Instance
(E
) then
535 (Declarations
(D
), Outer
=> False)
541 -- Processing for package specs, recurse into declarations.
542 -- Again we skip this for the case of generic instances.
544 elsif K
= N_Package_Declaration
then
545 S
:= Specification
(D
);
547 if not Is_Generic_Unit
(Defining_Entity
(S
)) then
549 (Private_Declarations
(S
), Outer
=> False)
553 (Visible_Declarations
(S
), Outer
=> False)
559 -- Objects and exceptions need not be public if we have
560 -- not encountered a referencer so far. We only reset
561 -- the flag for outer level entities that are not
562 -- imported/exported, and which have no interface name.
564 elsif K
= N_Object_Declaration
565 or else K
= N_Exception_Declaration
566 or else K
= N_Subprogram_Declaration
568 E
:= Defining_Entity
(D
);
571 and then not Is_Imported
(E
)
572 and then not Is_Exported
(E
)
573 and then No
(Interface_Name
(E
))
575 Set_Is_Public
(E
, False);
585 -- Start of processing for Make_Non_Public_Where_Possible
590 pragma Warnings
(Off
, Discard
);
593 Discard
:= Has_Referencer
(Declarations
(N
), Outer
=> True);
595 end Make_Non_Public_Where_Possible
;
598 -- If expander is not active, then here is where we turn off the
599 -- In_Package_Body flag, otherwise it is turned off at the end of
600 -- the corresponding expansion routine. If this is an instance body,
601 -- we need to qualify names of local entities, because the body may
602 -- have been compiled as a preliminary to another instantiation.
604 if not Expander_Active
then
605 Set_In_Package_Body
(Spec_Id
, False);
607 if Is_Generic_Instance
(Spec_Id
)
608 and then Operating_Mode
= Generate_Code
610 Qualify_Entity_Names
(N
);
613 end Analyze_Package_Body
;
615 ---------------------------------
616 -- Analyze_Package_Declaration --
617 ---------------------------------
619 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
620 Id
: constant Node_Id
:= Defining_Entity
(N
);
624 Generate_Definition
(Id
);
626 Set_Ekind
(Id
, E_Package
);
627 Set_Etype
(Id
, Standard_Void_Type
);
631 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
632 Set_Is_Pure
(Id
, PF
);
634 Set_Categorization_From_Pragmas
(N
);
637 Write_Str
("==== Compiling package spec ");
638 Write_Name
(Chars
(Id
));
639 Write_Str
(" from ");
640 Write_Location
(Sloc
(N
));
644 Analyze
(Specification
(N
));
645 Validate_Categorization_Dependency
(N
, Id
);
646 End_Package_Scope
(Id
);
648 -- For a compilation unit, indicate whether it needs a body, and
649 -- whether elaboration warnings may be meaningful on it.
651 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
652 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
654 if not Body_Required
(Parent
(N
)) then
655 Set_Suppress_Elaboration_Warnings
(Id
);
658 Validate_RT_RAT_Component
(N
);
660 end Analyze_Package_Declaration
;
662 -----------------------------------
663 -- Analyze_Package_Specification --
664 -----------------------------------
666 -- Note that this code is shared for the analysis of generic package
667 -- specs (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
669 procedure Analyze_Package_Specification
(N
: Node_Id
) is
670 Id
: constant Entity_Id
:= Defining_Entity
(N
);
671 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
672 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
673 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
676 Public_Child
: Boolean;
678 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
679 -- Clears constant indications (Never_Set_In_Source, Constant_Value,
680 -- and Is_True_Constant) on all variables that are entities of Id,
681 -- and on the chain whose first element is FE. A recursive call is
682 -- made for all packages and generic packages.
684 procedure Generate_Parent_References
;
685 -- For a child unit, generate references to parent units, for
686 -- GPS navigation purposes.
688 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
689 -- Child and Unit are entities of compilation units. True if Child
690 -- is a public child of Parent as defined in 10.1.1
692 ---------------------
693 -- Clear_Constants --
694 ---------------------
696 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
700 -- Ignore package renamings, not interesting and they can
701 -- cause self referential loops in the code below.
703 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
707 -- Note: in the loop below, the check for Next_Entity pointing
708 -- back to the package entity seems very odd, but it is needed,
709 -- because this kind of unexpected circularity does occur ???
712 while Present
(E
) and then E
/= Id
loop
713 if Ekind
(E
) = E_Variable
then
714 Set_Never_Set_In_Source
(E
, False);
715 Set_Is_True_Constant
(E
, False);
716 Set_Current_Value
(E
, Empty
);
717 Set_Is_Known_Non_Null
(E
, False);
719 elsif Ekind
(E
) = E_Package
721 Ekind
(E
) = E_Generic_Package
723 Clear_Constants
(E
, First_Entity
(E
));
724 Clear_Constants
(E
, First_Private_Entity
(E
));
731 --------------------------------
732 -- Generate_Parent_References --
733 --------------------------------
735 procedure Generate_Parent_References
is
736 Decl
: Node_Id
:= Parent
(N
);
739 if Id
= Cunit_Entity
(Main_Unit
)
740 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
742 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
744 elsif Nkind
(Unit
(Cunit
(Main_Unit
))) /= N_Subprogram_Body
745 and then Nkind
(Unit
(Cunit
(Main_Unit
))) /= N_Subunit
747 -- If current unit is an ancestor of main unit, generate
748 -- a reference to its own parent.
752 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
755 if Nkind
(Main_Spec
) = N_Package_Body
then
756 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
759 U
:= Parent_Spec
(Main_Spec
);
760 while Present
(U
) loop
761 if U
= Parent
(Decl
) then
762 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
765 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
769 U
:= Parent_Spec
(Unit
(U
));
774 end Generate_Parent_References
;
776 ---------------------
777 -- Is_Public_Child --
778 ---------------------
780 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
782 if not Is_Private_Descendant
(Child
) then
786 return not Private_Present
(
787 Parent
(Unit_Declaration_Node
(Child
)));
789 return Is_Public_Child
(Scope
(Child
), Unit
);
794 -- Start of processing for Analyze_Package_Specification
797 if Present
(Vis_Decls
) then
798 Analyze_Declarations
(Vis_Decls
);
801 -- Verify that incomplete types have received full declarations.
803 E
:= First_Entity
(Id
);
804 while Present
(E
) loop
805 if Ekind
(E
) = E_Incomplete_Type
806 and then No
(Full_View
(E
))
808 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
814 if Is_Remote_Call_Interface
(Id
)
815 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
817 Validate_RCI_Declarations
(Id
);
820 -- Save global references in the visible declarations, before
821 -- installing private declarations of parent unit if there is one,
822 -- because the privacy status of types defined in the parent will
823 -- change. This is only relevant for generic child units, but is
824 -- done in all cases for uniformity.
826 if Ekind
(Id
) = E_Generic_Package
827 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
830 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
831 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
834 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
835 Save_Global_References
(Orig_Decl
);
836 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
840 -- If package is a public child unit, then make the private
841 -- declarations of the parent visible.
843 Public_Child
:= False;
845 if Present
(Parent_Spec
(Parent
(N
))) then
846 Generate_Parent_References
;
849 Par
: Entity_Id
:= Id
;
853 while Scope
(Par
) /= Standard_Standard
854 and then Is_Public_Child
(Id
, Par
)
856 Public_Child
:= True;
858 Install_Private_Declarations
(Par
);
859 Pack_Decl
:= Unit_Declaration_Node
(Par
);
860 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
865 -- Analyze private part if present. The flag In_Private_Part is
866 -- reset in End_Package_Scope.
868 L
:= Last_Entity
(Id
);
870 if Present
(Priv_Decls
) then
871 Set_In_Private_Part
(Id
);
873 -- Upon entering a public child's private part, it may be
874 -- necessary to declare subprograms that were derived in
875 -- the package visible part but not yet made visible.
878 Declare_Inherited_Private_Subprograms
(Id
);
881 Analyze_Declarations
(Priv_Decls
);
883 -- The first private entity is the immediate follower of the last
884 -- visible entity, if there was one.
887 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
889 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
892 -- There may be inherited private subprograms that need to be
893 -- declared, even in the absence of an explicit private part.
894 -- If there are any public declarations in the package and
895 -- the package is a public child unit, then an implicit private
898 elsif Present
(L
) and then Public_Child
then
899 Set_In_Private_Part
(Id
);
900 Declare_Inherited_Private_Subprograms
(Id
);
901 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
904 -- Check rule of 3.6(11), which in general requires
905 -- waiting till all full types have been seen.
907 E
:= First_Entity
(Id
);
908 while Present
(E
) loop
909 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
910 Check_Aliased_Component_Types
(E
);
916 if Ekind
(Id
) = E_Generic_Package
917 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
918 and then Present
(Priv_Decls
)
920 -- Save global references in private declarations, ignoring the
921 -- visible declarations that were processed earlier.
924 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
925 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
926 Save_Form
: constant List_Id
:=
927 Generic_Formal_Declarations
(Orig_Decl
);
930 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
931 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
932 Save_Global_References
(Orig_Decl
);
933 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
934 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
938 Process_End_Label
(N
, 'e', Id
);
940 -- For the case of a library level package, we must go through all
941 -- the entities clearing the indications that the value may be
942 -- constant and not modified. Why? Because any client of this
943 -- package may modify these values freely from anywhere. This
944 -- also applies to any nested packages or generic packages.
946 -- For now we unconditionally clear constants for packages that
947 -- are instances of generic packages. The reason is that we do not
948 -- have the body yet, and we otherwise think things are unreferenced
949 -- when they are not. This should be fixed sometime (the effect is
950 -- not terrible, we just lose some warnings, and also some cases
951 -- of value propagation) ???
953 if Is_Library_Level_Entity
(Id
)
954 or else Is_Generic_Instance
(Id
)
956 Clear_Constants
(Id
, First_Entity
(Id
));
957 Clear_Constants
(Id
, First_Private_Entity
(Id
));
959 end Analyze_Package_Specification
;
961 --------------------------------------
962 -- Analyze_Private_Type_Declaration --
963 --------------------------------------
965 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
966 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
967 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
970 Generate_Definition
(Id
);
971 Set_Is_Pure
(Id
, PF
);
972 Init_Size_Align
(Id
);
974 if (Ekind
(Current_Scope
) /= E_Package
975 and then Ekind
(Current_Scope
) /= E_Generic_Package
)
976 or else In_Private_Part
(Current_Scope
)
978 Error_Msg_N
("invalid context for private declaration", N
);
981 New_Private_Type
(N
, Id
, N
);
982 Set_Depends_On_Private
(Id
);
983 end Analyze_Private_Type_Declaration
;
985 -------------------------------------------
986 -- Declare_Inherited_Private_Subprograms --
987 -------------------------------------------
989 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
995 New_Op
: Entity_Id
:= Empty
;
996 Parent_Subp
: Entity_Id
;
997 Found_Explicit
: Boolean;
998 Decl_Privates
: Boolean;
1000 function Has_Overriding_Pragma
(Subp
: Entity_Id
) return Boolean;
1001 -- Check whether a pragma Overriding has been provided for a primitive
1002 -- operation that is found to be overriding in the private part.
1004 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1005 -- Check whether an inherited subprogram is an operation of an
1006 -- untagged derived type.
1008 ---------------------------
1009 -- Has_Overriding_Pragma --
1010 ---------------------------
1012 function Has_Overriding_Pragma
(Subp
: Entity_Id
) return Boolean is
1013 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Subp
);
1018 or else Nkind
(Decl
) /= N_Subprogram_Declaration
1019 or else No
(Next
(Decl
))
1024 Prag
:= Next
(Decl
);
1026 while Present
(Prag
)
1027 and then Nkind
(Prag
) = N_Pragma
1029 if Chars
(Prag
) = Name_Overriding
1030 or else Chars
(Prag
) = Name_Optional_Overriding
1040 end Has_Overriding_Pragma
;
1042 ---------------------
1043 -- Is_Primitive_Of --
1044 ---------------------
1046 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1050 if Etype
(S
) = T
then
1054 Formal
:= First_Formal
(S
);
1056 while Present
(Formal
) loop
1057 if Etype
(Formal
) = T
then
1061 Next_Formal
(Formal
);
1066 end Is_Primitive_Of
;
1068 -- Start of processing for Declare_Inherited_Private_Subprograms
1071 E
:= First_Entity
(Id
);
1072 while Present
(E
) loop
1074 -- If the entity is a nonprivate type extension whose parent
1075 -- type is declared in an open scope, then the type may have
1076 -- inherited operations that now need to be made visible.
1077 -- Ditto if the entity is a formal derived type in a child unit.
1079 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1081 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1082 and then Is_Generic_Type
(E
)))
1083 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1084 and then E
= Base_Type
(E
)
1086 if Is_Tagged_Type
(E
) then
1087 Op_List
:= Primitive_Operations
(E
);
1089 Decl_Privates
:= False;
1091 Op_Elmt
:= First_Elmt
(Op_List
);
1092 while Present
(Op_Elmt
) loop
1093 Prim_Op
:= Node
(Op_Elmt
);
1095 -- If the primitive operation is an implicit operation
1096 -- with an internal name whose parent operation has
1097 -- a normal name, then we now need to either declare the
1098 -- operation (i.e., make it visible), or replace it
1099 -- by an overriding operation if one exists.
1101 if Present
(Alias
(Prim_Op
))
1102 and then not Comes_From_Source
(Prim_Op
)
1103 and then Is_Internal_Name
(Chars
(Prim_Op
))
1104 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1106 Parent_Subp
:= Alias
(Prim_Op
);
1108 Found_Explicit
:= False;
1109 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1110 while Present
(Op_Elmt_2
) loop
1111 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
1112 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
1114 -- The private inherited operation has been
1115 -- overridden by an explicit subprogram, so
1116 -- change the private op's list element to
1117 -- designate the explicit so the explicit
1118 -- one will get the right dispatching slot.
1120 New_Op
:= Node
(Op_Elmt_2
);
1121 Replace_Elmt
(Op_Elmt
, New_Op
);
1122 Remove_Elmt
(Op_List
, Op_Elmt_2
);
1123 Found_Explicit
:= True;
1124 Decl_Privates
:= True;
1126 -- If explicit_overriding is in effect, check that
1127 -- the overriding operation is properly labelled.
1129 if Explicit_Overriding
1130 and then Comes_From_Source
(New_Op
)
1131 and then not Has_Overriding_Pragma
(New_Op
)
1134 ("Missing overriding pragma for&",
1141 Next_Elmt
(Op_Elmt_2
);
1144 if not Found_Explicit
then
1146 (New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1149 (Is_Dispatching_Operation
(New_Op
)
1150 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
1152 -- Substitute the new operation for the old one
1153 -- in the type's primitive operations list. Since
1154 -- the new operation was also just added to the end
1155 -- of list, the last element must be removed.
1157 -- (Question: is there a simpler way of declaring
1158 -- the operation, say by just replacing the name
1159 -- of the earlier operation, reentering it in the
1160 -- in the symbol table (how?), and marking it as
1163 Replace_Elmt
(Op_Elmt
, New_Op
);
1164 Remove_Last_Elmt
(Op_List
);
1165 Decl_Privates
:= True;
1169 Next_Elmt
(Op_Elmt
);
1172 -- The type's DT attributes need to be recalculated
1173 -- in the case where private dispatching operations
1174 -- have been added or overridden. Normally this action
1175 -- occurs during type freezing, but we force it here
1176 -- since the type may already have been frozen (e.g.,
1177 -- if the type's package has an empty private part).
1178 -- This can only be done if expansion is active, otherwise
1179 -- Tag may not be present.
1182 and then Expander_Active
1184 Set_All_DT_Position
(E
);
1188 -- Non-tagged type, scan forward to locate
1189 -- inherited hidden operations.
1191 Prim_Op
:= Next_Entity
(E
);
1193 while Present
(Prim_Op
) loop
1194 if Is_Subprogram
(Prim_Op
)
1195 and then Present
(Alias
(Prim_Op
))
1196 and then not Comes_From_Source
(Prim_Op
)
1197 and then Is_Internal_Name
(Chars
(Prim_Op
))
1198 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1199 and then Is_Primitive_Of
(E
, Prim_Op
)
1201 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1204 Next_Entity
(Prim_Op
);
1211 end Declare_Inherited_Private_Subprograms
;
1213 -----------------------
1214 -- End_Package_Scope --
1215 -----------------------
1217 procedure End_Package_Scope
(P
: Entity_Id
) is
1219 Uninstall_Declarations
(P
);
1221 end End_Package_Scope
;
1223 ---------------------------
1224 -- Exchange_Declarations --
1225 ---------------------------
1227 procedure Exchange_Declarations
(Id
: Entity_Id
) is
1228 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
1229 H1
: constant Entity_Id
:= Homonym
(Id
);
1230 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
1235 -- If missing full declaration for type, nothing to exchange
1237 if No
(Full_Id
) then
1241 -- Otherwise complete the exchange, and preserve semantic links
1243 Next2
:= Next_Entity
(Full_Id
);
1244 H2
:= Homonym
(Full_Id
);
1246 -- Reset full declaration pointer to reflect the switched entities
1247 -- and readjust the next entity chains.
1249 Exchange_Entities
(Id
, Full_Id
);
1251 Set_Next_Entity
(Id
, Next1
);
1252 Set_Homonym
(Id
, H1
);
1254 Set_Full_View
(Full_Id
, Id
);
1255 Set_Next_Entity
(Full_Id
, Next2
);
1256 Set_Homonym
(Full_Id
, H2
);
1257 end Exchange_Declarations
;
1259 ----------------------------
1260 -- Install_Package_Entity --
1261 ----------------------------
1263 procedure Install_Package_Entity
(Id
: Entity_Id
) is
1265 if not Is_Internal
(Id
) then
1266 if Debug_Flag_E
then
1267 Write_Str
("Install: ");
1268 Write_Name
(Chars
(Id
));
1272 if not Is_Child_Unit
(Id
) then
1273 Set_Is_Immediately_Visible
(Id
);
1277 end Install_Package_Entity
;
1279 ----------------------------------
1280 -- Install_Private_Declarations --
1281 ----------------------------------
1283 procedure Install_Private_Declarations
(P
: Entity_Id
) is
1285 Priv_Elmt
: Elmt_Id
;
1290 -- First exchange declarations for private types, so that the
1291 -- full declaration is visible. For each private type, we check
1292 -- its Private_Dependents list and also exchange any subtypes of
1293 -- or derived types from it. Finally, if this is a Taft amendment
1294 -- type, the incomplete declaration is irrelevant, and we want to
1295 -- link the eventual full declaration with the original private
1296 -- one so we also skip the exchange.
1298 Id
:= First_Entity
(P
);
1299 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1301 if Is_Private_Base_Type
(Id
)
1302 and then Comes_From_Source
(Full_View
(Id
))
1303 and then Present
(Full_View
(Id
))
1304 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
1305 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
1307 -- If there is a use-type clause on the private type, set the
1308 -- full view accordingly.
1310 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
1311 Full
:= Full_View
(Id
);
1313 if Is_Private_Base_Type
(Full
)
1314 and then Has_Private_Declaration
(Full
)
1315 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
1316 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
1317 and then In_Package_Body
(Current_Scope
)
1318 and then not Is_Private_Type
(Etype
(Full
))
1320 -- This is the completion of a private type by a derivation
1321 -- from another private type which is not private anymore. This
1322 -- can only happen in a package nested within a child package,
1323 -- when the parent type is defined in the parent unit. At this
1324 -- point the current type is not private either, and we have to
1325 -- install the underlying full view, which is now visible.
1327 if No
(Full_View
(Full
))
1328 and then Present
(Underlying_Full_View
(Full
))
1330 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
1331 Set_Underlying_Full_View
(Full
, Empty
);
1332 Set_Is_Frozen
(Full_View
(Id
));
1336 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1338 Exchange_Declarations
(Id
);
1339 Set_Is_Immediately_Visible
(Id
);
1341 while Present
(Priv_Elmt
) loop
1342 Priv
:= Node
(Priv_Elmt
);
1344 -- Before the exchange, verify that the presence of the
1345 -- Full_View field. It will be empty if the entity
1346 -- has already been installed due to a previous call.
1348 if Present
(Full_View
(Priv
))
1349 and then Is_Visible_Dependent
(Priv
)
1352 -- For each subtype that is swapped, we also swap the
1353 -- reference to it in Private_Dependents, to allow access
1354 -- to it when we swap them out in End_Package_Scope.
1356 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
1357 Exchange_Declarations
(Priv
);
1358 Set_Is_Immediately_Visible
1359 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
1360 Set_Is_Potentially_Use_Visible
1361 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
1364 Next_Elmt
(Priv_Elmt
);
1371 -- Next make other declarations in the private part visible as well.
1373 Id
:= First_Private_Entity
(P
);
1375 while Present
(Id
) loop
1376 Install_Package_Entity
(Id
);
1380 -- Indicate that the private part is currently visible, so it can be
1381 -- properly reset on exit.
1383 Set_In_Private_Part
(P
);
1384 end Install_Private_Declarations
;
1386 ----------------------------------
1387 -- Install_Visible_Declarations --
1388 ----------------------------------
1390 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
1394 Id
:= First_Entity
(P
);
1396 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1397 Install_Package_Entity
(Id
);
1400 end Install_Visible_Declarations
;
1402 --------------------------
1403 -- Is_Private_Base_Type --
1404 --------------------------
1406 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
1408 return Ekind
(E
) = E_Private_Type
1409 or else Ekind
(E
) = E_Limited_Private_Type
1410 or else Ekind
(E
) = E_Record_Type_With_Private
;
1411 end Is_Private_Base_Type
;
1413 --------------------------
1414 -- Is_Visible_Dependent --
1415 --------------------------
1417 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
1419 S
: constant Entity_Id
:= Scope
(Dep
);
1422 -- Renamings created for actual types have the visibility of the
1425 if Ekind
(S
) = E_Package
1426 and then Is_Generic_Instance
(S
)
1427 and then (Is_Generic_Actual_Type
(Dep
)
1428 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
1432 elsif not (Is_Derived_Type
(Dep
))
1433 and then Is_Derived_Type
(Full_View
(Dep
))
1435 -- When instantiating a package body, the scope stack is empty,
1436 -- so check instead whether the dependent type is defined in
1437 -- the same scope as the instance itself.
1439 return In_Open_Scopes
(S
)
1440 or else (Is_Generic_Instance
(Current_Scope
)
1441 and then Scope
(Dep
) = Scope
(Current_Scope
));
1445 end Is_Visible_Dependent
;
1447 ----------------------------
1448 -- May_Need_Implicit_Body --
1449 ----------------------------
1451 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
1452 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
1453 S
: constant Node_Id
:= Parent
(P
);
1458 if not Has_Completion
(E
)
1459 and then Nkind
(P
) = N_Package_Declaration
1460 and then Present
(Activation_Chain_Entity
(P
))
1463 Make_Package_Body
(Sloc
(E
),
1464 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
1465 Chars
=> Chars
(E
)),
1466 Declarations
=> New_List
);
1468 if Nkind
(S
) = N_Package_Specification
then
1469 if Present
(Private_Declarations
(S
)) then
1470 Decls
:= Private_Declarations
(S
);
1472 Decls
:= Visible_Declarations
(S
);
1475 Decls
:= Declarations
(S
);
1481 end May_Need_Implicit_Body
;
1483 ----------------------
1484 -- New_Private_Type --
1485 ----------------------
1487 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
1491 if Limited_Present
(Def
) then
1492 Set_Ekind
(Id
, E_Limited_Private_Type
);
1494 Set_Ekind
(Id
, E_Private_Type
);
1498 Set_Has_Delayed_Freeze
(Id
);
1499 Set_Is_First_Subtype
(Id
);
1500 Init_Size_Align
(Id
);
1502 Set_Is_Constrained
(Id
,
1503 No
(Discriminant_Specifications
(N
))
1504 and then not Unknown_Discriminants_Present
(N
));
1506 -- Set tagged flag before processing discriminants, to catch
1509 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
1511 Set_Discriminant_Constraint
(Id
, No_Elist
);
1512 Set_Stored_Constraint
(Id
, No_Elist
);
1514 if Present
(Discriminant_Specifications
(N
)) then
1516 Process_Discriminants
(N
);
1519 elsif Unknown_Discriminants_Present
(N
) then
1520 Set_Has_Unknown_Discriminants
(Id
);
1523 Set_Private_Dependents
(Id
, New_Elmt_List
);
1525 if Tagged_Present
(Def
) then
1526 Set_Ekind
(Id
, E_Record_Type_With_Private
);
1527 Make_Class_Wide_Type
(Id
);
1528 Set_Primitive_Operations
(Id
, New_Elmt_List
);
1529 Set_Is_Abstract
(Id
, Abstract_Present
(Def
));
1530 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
1531 Set_Has_Delayed_Freeze
(Id
, True);
1533 elsif Abstract_Present
(Def
) then
1534 Error_Msg_N
("only a tagged type can be abstract", N
);
1536 end New_Private_Type
;
1538 ----------------------------
1539 -- Uninstall_Declarations --
1540 ----------------------------
1542 procedure Uninstall_Declarations
(P
: Entity_Id
) is
1543 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
1546 Priv_Elmt
: Elmt_Id
;
1547 Priv_Sub
: Entity_Id
;
1549 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
1550 -- Copy to the private declaration the attributes of the full view
1551 -- that need to be available for the partial view also.
1553 function Type_In_Use
(T
: Entity_Id
) return Boolean;
1554 -- Check whether type or base type appear in an active use_type clause.
1556 ------------------------------
1557 -- Preserve_Full_Attributes --
1558 ------------------------------
1560 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
1561 Priv_Is_Base_Type
: constant Boolean := Priv
= Base_Type
(Priv
);
1564 Set_Size_Info
(Priv
, (Full
));
1565 Set_RM_Size
(Priv
, RM_Size
(Full
));
1566 Set_Size_Known_At_Compile_Time
(Priv
, Size_Known_At_Compile_Time
1568 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
1569 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
1571 if Referenced
(Full
) then
1572 Set_Referenced
(Priv
);
1575 if Priv_Is_Base_Type
then
1576 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
1577 Set_Finalize_Storage_Only
(Priv
, Finalize_Storage_Only
1578 (Base_Type
(Full
)));
1579 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
1580 Set_Has_Controlled_Component
(Priv
, Has_Controlled_Component
1581 (Base_Type
(Full
)));
1584 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
1586 if Is_Tagged_Type
(Priv
)
1587 and then Is_Tagged_Type
(Full
)
1588 and then not Error_Posted
(Full
)
1590 if Priv_Is_Base_Type
then
1591 Set_Access_Disp_Table
(Priv
, Access_Disp_Table
1592 (Base_Type
(Full
)));
1595 Set_First_Entity
(Priv
, First_Entity
(Full
));
1596 Set_Last_Entity
(Priv
, Last_Entity
(Full
));
1598 end Preserve_Full_Attributes
;
1604 function Type_In_Use
(T
: Entity_Id
) return Boolean is
1606 return Scope
(Base_Type
(T
)) = P
1607 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
1610 -- Start of processing for Uninstall_Declarations
1613 Id
:= First_Entity
(P
);
1615 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1616 if Debug_Flag_E
then
1617 Write_Str
("unlinking visible entity ");
1618 Write_Int
(Int
(Id
));
1622 -- On exit from the package scope, we must preserve the visibility
1623 -- established by use clauses in the current scope. Two cases:
1625 -- a) If the entity is an operator, it may be a primitive operator of
1626 -- a type for which there is a visible use-type clause.
1628 -- b) for other entities, their use-visibility is determined by a
1629 -- visible use clause for the package itself. For a generic instance,
1630 -- the instantiation of the formals appears in the visible part,
1631 -- but the formals are private and remain so.
1633 if Ekind
(Id
) = E_Function
1634 and then Is_Operator_Symbol_Name
(Chars
(Id
))
1635 and then not Is_Hidden
(Id
)
1636 and then not Error_Posted
(Id
)
1638 Set_Is_Potentially_Use_Visible
(Id
,
1640 or else Type_In_Use
(Etype
(Id
))
1641 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
1642 or else (Present
(Next_Formal
(First_Formal
(Id
)))
1645 (Etype
(Next_Formal
(First_Formal
(Id
))))));
1647 Set_Is_Potentially_Use_Visible
(Id
,
1648 In_Use
(P
) and not Is_Hidden
(Id
));
1651 -- Local entities are not immediately visible outside of the package.
1653 Set_Is_Immediately_Visible
(Id
, False);
1655 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
1656 Check_Abstract_Overriding
(Id
);
1659 if (Ekind
(Id
) = E_Private_Type
1660 or else Ekind
(Id
) = E_Limited_Private_Type
)
1661 and then No
(Full_View
(Id
))
1662 and then not Is_Generic_Type
(Id
)
1663 and then not Is_Derived_Type
(Id
)
1665 Error_Msg_N
("missing full declaration for private type&", Id
);
1667 elsif Ekind
(Id
) = E_Record_Type_With_Private
1668 and then not Is_Generic_Type
(Id
)
1669 and then No
(Full_View
(Id
))
1671 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
1672 Error_Msg_N
("missing full declaration for private type&", Id
);
1675 ("missing full declaration for private extension", Id
);
1678 elsif Ekind
(Id
) = E_Constant
1679 and then No
(Constant_Value
(Id
))
1680 and then No
(Full_View
(Id
))
1681 and then not Is_Imported
(Id
)
1682 and then (Nkind
(Parent
(Id
)) /= N_Object_Declaration
1683 or else not No_Initialization
(Parent
(Id
)))
1685 if not Has_Private_Declaration
(Etype
(Id
)) then
1687 -- We assume that the user did not not intend a deferred
1688 -- constant declaration, and the expression is just missing.
1691 ("constant declaration requires initialization expression",
1694 if Is_Limited_Type
(Etype
(Id
)) then
1696 ("\else remove keyword CONSTANT from declaration",
1702 ("missing full declaration for deferred constant ('R'M 7.4)",
1705 if Is_Limited_Type
(Etype
(Id
)) then
1707 ("\else remove keyword CONSTANT from declaration",
1716 -- If the specification was installed as the parent of a public child
1717 -- unit, the private declarations were not installed, and there is
1720 if not In_Private_Part
(P
) then
1723 Set_In_Private_Part
(P
, False);
1726 -- Make private entities invisible and exchange full and private
1727 -- declarations for private types.
1729 while Present
(Id
) loop
1730 if Debug_Flag_E
then
1731 Write_Str
("unlinking private entity ");
1732 Write_Int
(Int
(Id
));
1736 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
1737 Check_Abstract_Overriding
(Id
);
1740 Set_Is_Immediately_Visible
(Id
, False);
1742 if Is_Private_Base_Type
(Id
)
1743 and then Present
(Full_View
(Id
))
1745 Full
:= Full_View
(Id
);
1747 -- If the partial view is not declared in the visible part
1748 -- of the package (as is the case when it is a type derived
1749 -- from some other private type in the private part of the
1750 -- current package), no exchange takes place.
1753 or else List_Containing
(Parent
(Id
))
1754 /= Visible_Declarations
(Specification
(Decl
))
1759 -- The entry in the private part points to the full declaration,
1760 -- which is currently visible. Exchange them so only the private
1761 -- type declaration remains accessible, and link private and
1762 -- full declaration in the opposite direction. Before the actual
1763 -- exchange, we copy back attributes of the full view that
1764 -- must be available to the partial view too.
1766 Preserve_Full_Attributes
(Id
, Full
);
1768 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
1770 if Is_Indefinite_Subtype
(Full
)
1771 and then not Is_Indefinite_Subtype
(Id
)
1774 ("full view of type must be definite subtype", Full
);
1777 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1778 Exchange_Declarations
(Id
);
1780 -- Swap out the subtypes and derived types of Id that were
1781 -- compiled in this scope, or installed previously by
1782 -- Install_Private_Declarations.
1783 -- Before we do the swap, we verify the presence of the
1784 -- Full_View field which may be empty due to a swap by
1785 -- a previous call to End_Package_Scope (e.g. from the
1786 -- freezing mechanism).
1788 while Present
(Priv_Elmt
) loop
1789 Priv_Sub
:= Node
(Priv_Elmt
);
1791 if Present
(Full_View
(Priv_Sub
)) then
1793 if Scope
(Priv_Sub
) = P
1794 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
1796 Set_Is_Immediately_Visible
(Priv_Sub
, False);
1799 if Is_Visible_Dependent
(Priv_Sub
) then
1800 Preserve_Full_Attributes
1801 (Priv_Sub
, Full_View
(Priv_Sub
));
1802 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
1803 Exchange_Declarations
(Priv_Sub
);
1807 Next_Elmt
(Priv_Elmt
);
1810 elsif Ekind
(Id
) = E_Incomplete_Type
1811 and then No
(Full_View
(Id
))
1813 -- Mark Taft amendment types
1815 Set_Has_Completion_In_Body
(Id
);
1817 elsif not Is_Child_Unit
(Id
)
1818 and then (not Is_Private_Type
(Id
)
1819 or else No
(Full_View
(Id
)))
1822 Set_Is_Potentially_Use_Visible
(Id
, False);
1828 end Uninstall_Declarations
;
1830 ------------------------
1831 -- Unit_Requires_Body --
1832 ------------------------
1834 function Unit_Requires_Body
(P
: Entity_Id
) return Boolean is
1838 -- Imported entity never requires body. Right now, only
1839 -- subprograms can be imported, but perhaps in the future
1840 -- we will allow import of packages.
1842 if Is_Imported
(P
) then
1845 -- Body required if library package with pragma Elaborate_Body
1847 elsif Has_Pragma_Elaborate_Body
(P
) then
1850 -- Body required if subprogram
1852 elsif Is_Subprogram
(P
) or else Is_Generic_Subprogram
(P
) then
1855 -- Treat a block as requiring a body
1857 elsif Ekind
(P
) = E_Block
then
1860 elsif Ekind
(P
) = E_Package
1861 and then Nkind
(Parent
(P
)) = N_Package_Specification
1862 and then Present
(Generic_Parent
(Parent
(P
)))
1865 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(P
));
1868 if Has_Pragma_Elaborate_Body
(G_P
) then
1874 -- Otherwise search entity chain for entity requiring completion.
1876 E
:= First_Entity
(P
);
1877 while Present
(E
) loop
1879 -- Always ignore child units. Child units get added to the entity
1880 -- list of a parent unit, but are not original entities of the
1881 -- parent, and so do not affect whether the parent needs a body.
1883 if Is_Child_Unit
(E
) then
1886 -- Otherwise test to see if entity requires a completion
1888 elsif (Is_Overloadable
(E
)
1889 and then Ekind
(E
) /= E_Enumeration_Literal
1890 and then Ekind
(E
) /= E_Operator
1891 and then not Is_Abstract
(E
)
1892 and then not Has_Completion
(E
))
1895 (Ekind
(E
) = E_Package
1897 and then not Has_Completion
(E
)
1898 and then Unit_Requires_Body
(E
))
1901 (Ekind
(E
) = E_Incomplete_Type
and then No
(Full_View
(E
)))
1904 ((Ekind
(E
) = E_Task_Type
or else
1905 Ekind
(E
) = E_Protected_Type
)
1906 and then not Has_Completion
(E
))
1909 (Ekind
(E
) = E_Generic_Package
and then E
/= P
1910 and then not Has_Completion
(E
)
1911 and then Unit_Requires_Body
(E
))
1914 (Is_Generic_Subprogram
(E
)
1915 and then not Has_Completion
(E
))
1920 -- Entity that does not require completion
1930 end Unit_Requires_Body
;