1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2002, 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_Composite_Operations
(P
: Entity_Id
);
89 -- Composite types declared in the current scope may depend on
90 -- types that were private at the point of declaration, and whose
91 -- full view is now in scope. Indicate that the corresponding
92 -- operations on the composite type are available.
94 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
95 -- True for a private type that is not a subtype.
97 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
98 -- If the private dependent is a private type whose full view is
99 -- derived from the parent type, its full properties are revealed
100 -- only if we are in the immediate scope of the private dependent.
101 -- Should this predicate be tightened further???
103 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
104 -- Copy to the private declaration the attributes of the full view
105 -- that need to be available for the partial view also.
107 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
108 -- Called upon entering the private part of a public child package
109 -- and the body of a nested package, to potentially declare certain
110 -- inherited subprograms that were inherited by types in the visible
111 -- part, but whose declaration was deferred because the parent
112 -- operation was private and not visible at that point. These
113 -- subprograms are located by traversing the visible part declarations
114 -- looking for nonprivate type extensions and then examining each of
115 -- the primitive operations of such types to find those that were
116 -- inherited but declared with a special internal name. Each such
117 -- operation is now declared as an operation with a normal name (using
118 -- the name of the parent operation) and replaces the previous implicit
119 -- operation in the primitive operations list of the type. If the
120 -- inherited private operation has been overridden, then it's
121 -- replaced by the overriding operation.
123 --------------------------
124 -- Analyze_Package_Body --
125 --------------------------
127 procedure Analyze_Package_Body
(N
: Node_Id
) is
128 Loc
: constant Source_Ptr
:= Sloc
(N
);
132 Last_Spec_Entity
: Entity_Id
;
137 -- Find corresponding package specification, and establish the
138 -- current scope. The visible defining entity for the package is the
139 -- defining occurrence in the spec. On exit from the package body, all
140 -- body declarations are attached to the defining entity for the body,
141 -- but the later is never used for name resolution. In this fashion
142 -- there is only one visible entity that denotes the package.
145 Write_Str
("==== Compiling package body ");
146 Write_Name
(Chars
(Defining_Entity
(N
)));
147 Write_Str
(" from ");
148 Write_Location
(Loc
);
152 -- Set Body_Id. Note that this will be reset to point to the
153 -- generic copy later on in the generic case.
155 Body_Id
:= Defining_Entity
(N
);
157 if Present
(Corresponding_Spec
(N
)) then
159 -- Body is body of package instantiation. Corresponding spec
160 -- has already been set.
162 Spec_Id
:= Corresponding_Spec
(N
);
163 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
166 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
169 and then Is_Package
(Spec_Id
)
171 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
173 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
174 Error_Msg_N
("cannot supply body for package renaming", N
);
177 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
178 Error_Msg_N
("redefinition of package body", N
);
183 Error_Msg_N
("missing specification for package body", N
);
187 if Is_Package
(Spec_Id
)
189 (Scope
(Spec_Id
) = Standard_Standard
190 or else Is_Child_Unit
(Spec_Id
))
191 and then not Unit_Requires_Body
(Spec_Id
)
195 ("optional package body (not allowed in Ada 95)?", N
);
198 ("spec of this package does not allow a body", N
);
203 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
204 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
206 if Is_Child_Unit
(Spec_Id
) then
208 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
210 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
213 Set_Is_Child_Unit
(Body_Id
);
216 -- Generic package case
218 if Ekind
(Spec_Id
) = E_Generic_Package
then
220 -- Disable expansion and perform semantic analysis on copy.
221 -- The unannotated body will be used in all instantiations.
223 Body_Id
:= Defining_Entity
(N
);
224 Set_Ekind
(Body_Id
, E_Package_Body
);
225 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
226 Set_Body_Entity
(Spec_Id
, Body_Id
);
227 Set_Spec_Entity
(Body_Id
, Spec_Id
);
229 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
232 -- Update Body_Id to point to the copied node for the remainder
233 -- of the processing.
235 Body_Id
:= Defining_Entity
(N
);
239 -- The Body_Id is that of the copied node in the generic case, the
240 -- current node otherwise. Note that N was rewritten above, so we
241 -- must be sure to get the latest Body_Id value.
243 Set_Ekind
(Body_Id
, E_Package_Body
);
244 Set_Body_Entity
(Spec_Id
, Body_Id
);
245 Set_Spec_Entity
(Body_Id
, Spec_Id
);
247 -- Defining name for the package body is not a visible entity: Only
248 -- the defining name for the declaration is visible.
250 Set_Etype
(Body_Id
, Standard_Void_Type
);
251 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
252 Set_Corresponding_Spec
(N
, Spec_Id
);
253 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
255 -- The body entity is not used for semantics or code generation, but
256 -- it is attached to the entity list of the enclosing scope to simplify
257 -- the listing of back-annotations for the types it main contain.
259 if Scope
(Spec_Id
) /= Standard_Standard
then
260 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
263 -- Indicate that we are currently compiling the body of the package.
265 Set_In_Package_Body
(Spec_Id
);
266 Set_Has_Completion
(Spec_Id
);
267 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
271 Set_Categorization_From_Pragmas
(N
);
273 Install_Visible_Declarations
(Spec_Id
);
274 Install_Private_Declarations
(Spec_Id
);
275 Install_Composite_Operations
(Spec_Id
);
277 if Ekind
(Spec_Id
) = E_Generic_Package
then
278 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
281 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
282 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
284 -- This is a nested package, so it may be necessary to declare
285 -- certain inherited subprograms that are not yet visible because
286 -- the parent type's subprograms are now visible.
288 if Ekind
(Scope
(Spec_Id
)) = E_Package
289 and then Scope
(Spec_Id
) /= Standard_Standard
291 Declare_Inherited_Private_Subprograms
(Spec_Id
);
294 if Present
(Declarations
(N
)) then
295 Analyze_Declarations
(Declarations
(N
));
298 HSS
:= Handled_Statement_Sequence
(N
);
300 if Present
(HSS
) then
301 Process_End_Label
(HSS
, 't', Spec_Id
);
304 -- Check that elaboration code in a preelaborable package body is
305 -- empty other than null statements and labels (RM 10.2.1(6)).
307 Validate_Null_Statement_Sequence
(N
);
310 Validate_Categorization_Dependency
(N
, Spec_Id
);
311 Check_Completion
(Body_Id
);
313 -- Generate start of body reference. Note that we do this fairly late,
314 -- because the call will use In_Extended_Main_Source_Unit as a check,
315 -- and we want to make sure that Corresponding_Stub links are set
317 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
319 -- For a generic package, collect global references and mark
320 -- them on the original body so that they are not resolved
321 -- again at the point of instantiation.
323 if Ekind
(Spec_Id
) /= E_Package
then
324 Save_Global_References
(Original_Node
(N
));
328 -- The entities of the package body have so far been chained onto
329 -- the declaration chain for the spec. That's been fine while we
330 -- were in the body, since we wanted them to be visible, but now
331 -- that we are leaving the package body, they are no longer visible,
332 -- so we remove them from the entity chain of the package spec entity,
333 -- and copy them to the entity chain of the package body entity, where
334 -- they will never again be visible.
336 if Present
(Last_Spec_Entity
) then
337 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
338 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
339 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
340 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
343 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
344 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
345 Set_First_Entity
(Spec_Id
, Empty
);
346 Set_Last_Entity
(Spec_Id
, Empty
);
349 End_Package_Scope
(Spec_Id
);
351 -- All entities declared in body are not visible.
357 E
:= First_Entity
(Body_Id
);
359 while Present
(E
) loop
360 Set_Is_Immediately_Visible
(E
, False);
361 Set_Is_Potentially_Use_Visible
(E
, False);
364 -- Child units may appear on the entity list (for example if
365 -- they appear in the context of a subunit) but they are not
368 if not Is_Child_Unit
(E
) then
369 Set_Is_Package_Body_Entity
(E
);
376 Check_References
(Body_Id
);
378 -- The processing so far has made all entities of the package body
379 -- public (i.e. externally visible to the linker). This is in general
380 -- necessary, since inlined or generic bodies, for which code is
381 -- generated in other units, may need to see these entities. The
382 -- following loop runs backwards from the end of the entities of the
383 -- package body making these entities invisible until we reach a
384 -- referencer, i.e. a declaration that could reference a previous
385 -- declaration, a generic body or an inlined body, or a stub (which
386 -- may contain either of these). This is of course an approximation,
387 -- but it is conservative and definitely correct.
389 -- We only do this at the outer (library) level non-generic packages.
390 -- The reason is simply to cut down on the number of external symbols
391 -- generated, so this is simply an optimization of the efficiency
392 -- of the compilation process. It has no other effect.
394 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
395 and then not Is_Generic_Unit
(Spec_Id
)
396 and then Present
(Declarations
(N
))
398 Make_Non_Public_Where_Possible
: declare
401 function Has_Referencer
405 -- Traverse the given list of declarations in reverse order.
406 -- Return True as soon as a referencer is reached. Return
407 -- False if none is found. The Outer parameter is True for
408 -- the outer level call, and False for inner level calls for
409 -- nested packages. If Outer is True, then any entities up
410 -- to the point of hitting a referencer get their Is_Public
411 -- flag cleared, so that the entities will be treated as
412 -- static entities in the C sense, and need not have fully
413 -- qualified names. For inner levels, we need all names to
414 -- be fully qualified to deal with the same name appearing
415 -- in parallel packages (right now this is tied to their
422 function Has_Referencer
439 while Present
(D
) loop
442 if K
in N_Body_Stub
then
445 elsif K
= N_Subprogram_Body
then
446 if Acts_As_Spec
(D
) then
447 E
:= Defining_Entity
(D
);
449 -- An inlined body acts as a referencer. Note also
450 -- that we never reset Is_Public for an inlined
451 -- subprogram. Gigi requires Is_Public to be set.
453 -- Note that we test Has_Pragma_Inline here rather
454 -- than Is_Inlined. We are compiling this for a
455 -- client, and it is the client who will decide
456 -- if actual inlining should occur, so we need to
457 -- assume that the procedure could be inlined for
458 -- the purpose of accessing global entities.
460 if Has_Pragma_Inline
(E
) then
463 Set_Is_Public
(E
, False);
467 E
:= Corresponding_Spec
(D
);
470 and then (Is_Generic_Unit
(E
)
471 or else Has_Pragma_Inline
(E
)
472 or else Is_Inlined
(E
))
478 -- Processing for package bodies
480 elsif K
= N_Package_Body
481 and then Present
(Corresponding_Spec
(D
))
483 E
:= Corresponding_Spec
(D
);
485 -- Generic package body is a referencer. It would
486 -- seem that we only have to consider generics that
487 -- can be exported, i.e. where the corresponding spec
488 -- is the spec of the current package, but because of
489 -- nested instantiations, a fully private generic
490 -- body may export other private body entities.
492 if Is_Generic_Unit
(E
) then
495 -- For non-generic package body, recurse into body
496 -- unless this is an instance, we ignore instances
497 -- since they cannot have references that affect
500 elsif not Is_Generic_Instance
(E
) then
502 (Declarations
(D
), Outer
=> False)
508 -- Processing for package specs, recurse into declarations.
509 -- Again we skip this for the case of generic instances.
511 elsif K
= N_Package_Declaration
then
512 S
:= Specification
(D
);
514 if not Is_Generic_Unit
(Defining_Entity
(S
)) then
516 (Private_Declarations
(S
), Outer
=> False)
520 (Visible_Declarations
(S
), Outer
=> False)
526 -- Objects and exceptions need not be public if we have
527 -- not encountered a referencer so far. We only reset
528 -- the flag for outer level entities that are not
529 -- imported/exported, and which have no interface name.
531 elsif K
= N_Object_Declaration
532 or else K
= N_Exception_Declaration
533 or else K
= N_Subprogram_Declaration
535 E
:= Defining_Entity
(D
);
538 and then not Is_Imported
(E
)
539 and then not Is_Exported
(E
)
540 and then No
(Interface_Name
(E
))
542 Set_Is_Public
(E
, False);
552 -- Start of processing for Make_Non_Public_Where_Possible
555 Discard
:= Has_Referencer
(Declarations
(N
), Outer
=> True);
556 end Make_Non_Public_Where_Possible
;
559 -- If expander is not active, then here is where we turn off the
560 -- In_Package_Body flag, otherwise it is turned off at the end of
561 -- the corresponding expansion routine. If this is an instance body,
562 -- we need to qualify names of local entities, because the body may
563 -- have been compiled as a preliminary to another instantiation.
565 if not Expander_Active
then
566 Set_In_Package_Body
(Spec_Id
, False);
568 if Is_Generic_Instance
(Spec_Id
)
569 and then Operating_Mode
= Generate_Code
571 Qualify_Entity_Names
(N
);
574 end Analyze_Package_Body
;
576 ---------------------------------
577 -- Analyze_Package_Declaration --
578 ---------------------------------
580 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
581 Id
: constant Node_Id
:= Defining_Entity
(N
);
585 Generate_Definition
(Id
);
587 Set_Ekind
(Id
, E_Package
);
588 Set_Etype
(Id
, Standard_Void_Type
);
591 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
592 Set_Is_Pure
(Id
, PF
);
594 Set_Categorization_From_Pragmas
(N
);
597 Write_Str
("==== Compiling package spec ");
598 Write_Name
(Chars
(Id
));
599 Write_Str
(" from ");
600 Write_Location
(Sloc
(N
));
604 Analyze
(Specification
(N
));
605 Validate_Categorization_Dependency
(N
, Id
);
606 End_Package_Scope
(Id
);
608 -- For a compilation unit, indicate whether it needs a body, and
609 -- whether elaboration warnings may be meaningful on it.
611 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
612 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
614 if not Body_Required
(Parent
(N
)) then
615 Set_Suppress_Elaboration_Warnings
(Id
);
618 Validate_RT_RAT_Component
(N
);
621 -- Clear Not_Source_Assigned on all variables in the package spec,
622 -- because at this stage some client, or the body, or a child package,
623 -- may modify variables in the declaration. Note that we wait till now
624 -- to reset these flags, because during analysis of the declaration,
625 -- the flags correctly indicated the status up to that point. We
626 -- similarly clear any Is_True_Constant indications.
632 E
:= First_Entity
(Id
);
633 while Present
(E
) loop
634 if Ekind
(E
) = E_Variable
then
635 Set_Not_Source_Assigned
(E
, False);
636 Set_Is_True_Constant
(E
, False);
642 end Analyze_Package_Declaration
;
644 -----------------------------------
645 -- Analyze_Package_Specification --
646 -----------------------------------
648 procedure Analyze_Package_Specification
(N
: Node_Id
) is
649 Id
: constant Entity_Id
:= Defining_Entity
(N
);
650 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
651 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
652 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
655 Public_Child
: Boolean := False;
657 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
658 -- Child and Unit are entities of compilation units. True if Child
659 -- is a public child of Parent as defined in 10.1.1
661 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
663 if not Is_Private_Descendant
(Child
) then
667 return not Private_Present
(
668 Parent
(Unit_Declaration_Node
(Child
)));
670 return Is_Public_Child
(Scope
(Child
), Unit
);
675 -- Start of processing for Analyze_Package_Specification
678 if Present
(Vis_Decls
) then
679 Analyze_Declarations
(Vis_Decls
);
682 -- Verify that incomplete types have received full declarations.
684 E
:= First_Entity
(Id
);
686 while Present
(E
) loop
687 if Ekind
(E
) = E_Incomplete_Type
688 and then No
(Full_View
(E
))
690 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
696 if Is_Remote_Call_Interface
(Id
)
697 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
699 Validate_RCI_Declarations
(Id
);
702 -- Save global references in the visible declarations, before
703 -- installing private declarations of parent unit if there is one,
704 -- because the privacy status of types defined in the parent will
705 -- change. This is only relevant for generic child units, but is
706 -- done in all cases for uniformity.
708 if Ekind
(Id
) = E_Generic_Package
709 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
712 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
713 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
716 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
717 Save_Global_References
(Orig_Decl
);
718 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
722 -- If package is a public child unit, then make the private
723 -- declarations of the parent visible.
725 if Present
(Parent_Spec
(Parent
(N
))) then
727 Par
: Entity_Id
:= Id
;
731 while Scope
(Par
) /= Standard_Standard
732 and then Is_Public_Child
(Id
, Par
)
734 Public_Child
:= True;
736 Install_Private_Declarations
(Par
);
737 Pack_Decl
:= Unit_Declaration_Node
(Par
);
738 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
743 -- Analyze private part if present. The flag In_Private_Part is
744 -- reset in End_Package_Scope.
746 L
:= Last_Entity
(Id
);
748 if Present
(Priv_Decls
) then
749 L
:= Last_Entity
(Id
);
750 Set_In_Private_Part
(Id
);
752 -- Upon entering a public child's private part, it may be
753 -- necessary to declare subprograms that were derived in
754 -- the package visible part but not yet made visible.
757 Declare_Inherited_Private_Subprograms
(Id
);
760 Analyze_Declarations
(Priv_Decls
);
762 -- The first private entity is the immediate follower of the last
763 -- visible entity, if there was one.
766 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
768 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
771 -- There may be inherited private subprograms that need to be
772 -- declared, even in the absence of an explicit private part.
773 -- If there are any public declarations in the package and
774 -- the package is a public child unit, then an implicit private
777 elsif Present
(L
) and then Public_Child
then
778 Set_In_Private_Part
(Id
);
779 Declare_Inherited_Private_Subprograms
(Id
);
780 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
783 -- Check rule of 3.6(11), which in general requires
784 -- waiting till all full types have been seen.
786 E
:= First_Entity
(Id
);
787 while Present
(E
) loop
788 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
789 Check_Aliased_Component_Types
(E
);
795 if Ekind
(Id
) = E_Generic_Package
796 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
797 and then Present
(Priv_Decls
)
799 -- Save global references in private declarations, ignoring the
800 -- visible declarations that were processed earlier.
803 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
804 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
805 Save_Form
: constant List_Id
:=
806 Generic_Formal_Declarations
(Orig_Decl
);
809 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
810 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
811 Save_Global_References
(Orig_Decl
);
812 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
813 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
817 Process_End_Label
(N
, 'e', Id
);
818 end Analyze_Package_Specification
;
820 --------------------------------------
821 -- Analyze_Private_Type_Declaration --
822 --------------------------------------
824 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
825 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
826 Id
: Entity_Id
:= Defining_Identifier
(N
);
829 Generate_Definition
(Id
);
830 Set_Is_Pure
(Id
, PF
);
831 Init_Size_Align
(Id
);
833 if (Ekind
(Current_Scope
) /= E_Package
834 and then Ekind
(Current_Scope
) /= E_Generic_Package
)
835 or else In_Private_Part
(Current_Scope
)
837 Error_Msg_N
("invalid context for private declaration", N
);
840 New_Private_Type
(N
, Id
, N
);
841 Set_Depends_On_Private
(Id
);
842 Set_Has_Delayed_Freeze
(Id
);
844 end Analyze_Private_Type_Declaration
;
846 -------------------------------------------
847 -- Declare_Inherited_Private_Subprograms --
848 -------------------------------------------
850 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
857 Parent_Subp
: Entity_Id
;
858 Found_Explicit
: Boolean;
859 Decl_Privates
: Boolean;
861 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
862 -- Check whether an inherited subprogram is an operation of an
863 -- untagged derived type.
865 ---------------------
866 -- Is_Primitive_Of --
867 ---------------------
869 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
873 if Etype
(S
) = T
then
877 Formal
:= First_Formal
(S
);
879 while Present
(Formal
) loop
880 if Etype
(Formal
) = T
then
884 Next_Formal
(Formal
);
891 -- Start of processing for Declare_Inherited_Private_Subprograms
894 E
:= First_Entity
(Id
);
896 while Present
(E
) loop
898 -- If the entity is a nonprivate type extension whose parent
899 -- type is declared in an open scope, then the type may have
900 -- inherited operations that now need to be made visible.
901 -- Ditto if the entity is a formal derived type in a child unit.
903 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
905 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
906 and then Is_Generic_Type
(E
)))
907 and then In_Open_Scopes
(Scope
(Etype
(E
)))
908 and then E
= Base_Type
(E
)
910 if Is_Tagged_Type
(E
) then
911 Op_List
:= Primitive_Operations
(E
);
912 Op_Elmt
:= First_Elmt
(Op_List
);
914 Decl_Privates
:= False;
916 while Present
(Op_Elmt
) loop
917 Prim_Op
:= Node
(Op_Elmt
);
919 -- If the primitive operation is an implicit operation
920 -- with an internal name whose parent operation has
921 -- a normal name, then we now need to either declare the
922 -- operation (i.e., make it visible), or replace it
923 -- by an overriding operation if one exists.
925 if Present
(Alias
(Prim_Op
))
926 and then not Comes_From_Source
(Prim_Op
)
927 and then Is_Internal_Name
(Chars
(Prim_Op
))
928 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
930 Parent_Subp
:= Alias
(Prim_Op
);
932 Found_Explicit
:= False;
933 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
934 while Present
(Op_Elmt_2
) loop
935 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
936 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
938 -- The private inherited operation has been
939 -- overridden by an explicit subprogram, so
940 -- change the private op's list element to
941 -- designate the explicit so the explicit
942 -- one will get the right dispatching slot.
944 New_Op
:= Node
(Op_Elmt_2
);
945 Replace_Elmt
(Op_Elmt
, New_Op
);
946 Remove_Elmt
(Op_List
, Op_Elmt_2
);
947 Found_Explicit
:= True;
948 Decl_Privates
:= True;
952 Next_Elmt
(Op_Elmt_2
);
955 if not Found_Explicit
then
957 (New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
960 (Is_Dispatching_Operation
(New_Op
)
961 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
963 -- Substitute the new operation for the old one
964 -- in the type's primitive operations list. Since
965 -- the new operation was also just added to the end
966 -- of list, the last element must be removed.
968 -- (Question: is there a simpler way of declaring
969 -- the operation, say by just replacing the name
970 -- of the earlier operation, reentering it in the
971 -- in the symbol table (how?), and marking it as
974 Replace_Elmt
(Op_Elmt
, New_Op
);
975 Remove_Last_Elmt
(Op_List
);
976 Decl_Privates
:= True;
983 -- The type's DT attributes need to be recalculated
984 -- in the case where private dispatching operations
985 -- have been added or overridden. Normally this action
986 -- occurs during type freezing, but we force it here
987 -- since the type may already have been frozen (e.g.,
988 -- if the type's package has an empty private part).
989 -- This can only be done if expansion is active, otherwise
990 -- Tag may not be present.
993 and then Expander_Active
995 Set_All_DT_Position
(E
);
999 -- Non-tagged type, scan forward to locate
1000 -- inherited hidden operations.
1002 Prim_Op
:= Next_Entity
(E
);
1004 while Present
(Prim_Op
) loop
1005 if Is_Subprogram
(Prim_Op
)
1006 and then Present
(Alias
(Prim_Op
))
1007 and then not Comes_From_Source
(Prim_Op
)
1008 and then Is_Internal_Name
(Chars
(Prim_Op
))
1009 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1010 and then Is_Primitive_Of
(E
, Prim_Op
)
1012 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1015 Next_Entity
(Prim_Op
);
1022 end Declare_Inherited_Private_Subprograms
;
1024 -----------------------
1025 -- End_Package_Scope --
1026 -----------------------
1028 procedure End_Package_Scope
(P
: Entity_Id
) is
1030 Uninstall_Declarations
(P
);
1032 end End_Package_Scope
;
1034 ---------------------------
1035 -- Exchange_Declarations --
1036 ---------------------------
1038 procedure Exchange_Declarations
(Id
: Entity_Id
) is
1039 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
1040 H1
: constant Entity_Id
:= Homonym
(Id
);
1041 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
1046 -- If missing full declaration for type, nothing to exchange
1048 if No
(Full_Id
) then
1052 -- Otherwise complete the exchange, and preserve semantic links
1054 Next2
:= Next_Entity
(Full_Id
);
1055 H2
:= Homonym
(Full_Id
);
1057 -- Reset full declaration pointer to reflect the switched entities
1058 -- and readjust the next entity chains.
1060 Exchange_Entities
(Id
, Full_Id
);
1062 Set_Next_Entity
(Id
, Next1
);
1063 Set_Homonym
(Id
, H1
);
1065 Set_Full_View
(Full_Id
, Id
);
1066 Set_Next_Entity
(Full_Id
, Next2
);
1067 Set_Homonym
(Full_Id
, H2
);
1068 end Exchange_Declarations
;
1070 ----------------------------------
1071 -- Install_Composite_Operations --
1072 ----------------------------------
1074 procedure Install_Composite_Operations
(P
: Entity_Id
) is
1078 Id
:= First_Entity
(P
);
1080 while Present
(Id
) loop
1083 and then (Is_Limited_Composite
(Id
)
1084 or else Is_Private_Composite
(Id
))
1085 and then No
(Private_Component
(Id
))
1087 Set_Is_Limited_Composite
(Id
, False);
1088 Set_Is_Private_Composite
(Id
, False);
1093 end Install_Composite_Operations
;
1095 ----------------------------
1096 -- Install_Package_Entity --
1097 ----------------------------
1099 procedure Install_Package_Entity
(Id
: Entity_Id
) is
1101 if not Is_Internal
(Id
) then
1102 if Debug_Flag_E
then
1103 Write_Str
("Install: ");
1104 Write_Name
(Chars
(Id
));
1108 if not Is_Child_Unit
(Id
) then
1109 Set_Is_Immediately_Visible
(Id
);
1113 end Install_Package_Entity
;
1115 ----------------------------------
1116 -- Install_Private_Declarations --
1117 ----------------------------------
1119 procedure Install_Private_Declarations
(P
: Entity_Id
) is
1121 Priv_Elmt
: Elmt_Id
;
1126 -- First exchange declarations for private types, so that the
1127 -- full declaration is visible. For each private type, we check
1128 -- its Private_Dependents list and also exchange any subtypes of
1129 -- or derived types from it. Finally, if this is a Taft amendment
1130 -- type, the incomplete declaration is irrelevant, and we want to
1131 -- link the eventual full declaration with the original private
1132 -- one so we also skip the exchange.
1134 Id
:= First_Entity
(P
);
1136 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1138 if Is_Private_Base_Type
(Id
)
1139 and then Comes_From_Source
(Full_View
(Id
))
1140 and then Present
(Full_View
(Id
))
1141 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
1142 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
1144 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1146 -- If there is a use-type clause on the private type, set the
1147 -- full view accordingly.
1149 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
1150 Full
:= Full_View
(Id
);
1152 if Is_Private_Base_Type
(Full
)
1153 and then Has_Private_Declaration
(Full
)
1154 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
1155 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
1156 and then In_Package_Body
(Current_Scope
)
1157 and then not Is_Private_Type
(Etype
(Full
))
1159 -- This is the completion of a private type by a derivation
1160 -- from another private type which is not private anymore. This
1161 -- can only happen in a package nested within a child package,
1162 -- when the parent type is defined in the parent unit. At this
1163 -- point the current type is not private either, and we have to
1164 -- install the underlying full view, which is now visible.
1166 if No
(Full_View
(Full
))
1167 and then Present
(Underlying_Full_View
(Full
))
1169 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
1170 Set_Underlying_Full_View
(Full
, Empty
);
1171 Set_Is_Frozen
(Full_View
(Id
));
1175 Exchange_Declarations
(Id
);
1176 Set_Is_Immediately_Visible
(Id
);
1178 while Present
(Priv_Elmt
) loop
1179 Priv
:= Node
(Priv_Elmt
);
1181 -- Before the exchange, verify that the presence of the
1182 -- Full_View field. It will be empty if the entity
1183 -- has already been installed due to a previous call.
1185 if Present
(Full_View
(Priv
))
1186 and then Is_Visible_Dependent
(Priv
)
1189 -- For each subtype that is swapped, we also swap the
1190 -- reference to it in Private_Dependents, to allow access
1191 -- to it when we swap them out in End_Package_Scope.
1193 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
1194 Exchange_Declarations
(Priv
);
1195 Set_Is_Immediately_Visible
1196 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
1197 Set_Is_Potentially_Use_Visible
1198 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
1201 Next_Elmt
(Priv_Elmt
);
1210 -- Next make other declarations in the private part visible as well.
1212 Id
:= First_Private_Entity
(P
);
1214 while Present
(Id
) loop
1215 Install_Package_Entity
(Id
);
1219 -- Indicate that the private part is currently visible, so it can be
1220 -- properly reset on exit.
1222 Set_In_Private_Part
(P
);
1223 end Install_Private_Declarations
;
1225 ----------------------------------
1226 -- Install_Visible_Declarations --
1227 ----------------------------------
1229 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
1233 Id
:= First_Entity
(P
);
1235 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1236 Install_Package_Entity
(Id
);
1239 end Install_Visible_Declarations
;
1241 ----------------------
1242 -- Is_Fully_Visible --
1243 ----------------------
1245 -- The full declaration of a private type is visible in the private
1246 -- part of the package declaration, and in the package body, at which
1247 -- point the full declaration must have been given.
1249 function Is_Fully_Visible
(Type_Id
: Entity_Id
) return Boolean is
1250 S
: constant Entity_Id
:= Scope
(Type_Id
);
1253 if Is_Generic_Type
(Type_Id
) then
1256 elsif In_Private_Part
(S
) then
1257 return Present
(Full_View
(Type_Id
));
1260 return In_Package_Body
(S
);
1262 end Is_Fully_Visible
;
1264 --------------------------
1265 -- Is_Private_Base_Type --
1266 --------------------------
1268 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
1270 return Ekind
(E
) = E_Private_Type
1271 or else Ekind
(E
) = E_Limited_Private_Type
1272 or else Ekind
(E
) = E_Record_Type_With_Private
;
1273 end Is_Private_Base_Type
;
1275 --------------------------
1276 -- Is_Visible_Dependent --
1277 --------------------------
1279 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
1281 S
: constant Entity_Id
:= Scope
(Dep
);
1284 -- Renamings created for actual types have the visibility of the
1287 if Ekind
(S
) = E_Package
1288 and then Is_Generic_Instance
(S
)
1289 and then (Is_Generic_Actual_Type
(Dep
)
1290 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
1294 elsif not (Is_Derived_Type
(Dep
))
1295 and then Is_Derived_Type
(Full_View
(Dep
))
1297 return In_Open_Scopes
(S
);
1301 end Is_Visible_Dependent
;
1303 ----------------------------
1304 -- May_Need_Implicit_Body --
1305 ----------------------------
1307 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
1308 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
1309 S
: constant Node_Id
:= Parent
(P
);
1314 if not Has_Completion
(E
)
1315 and then Nkind
(P
) = N_Package_Declaration
1316 and then Present
(Activation_Chain_Entity
(P
))
1319 Make_Package_Body
(Sloc
(E
),
1320 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
1321 Chars
=> Chars
(E
)),
1322 Declarations
=> New_List
);
1324 if Nkind
(S
) = N_Package_Specification
then
1325 if Present
(Private_Declarations
(S
)) then
1326 Decls
:= Private_Declarations
(S
);
1328 Decls
:= Visible_Declarations
(S
);
1331 Decls
:= Declarations
(S
);
1337 end May_Need_Implicit_Body
;
1339 ----------------------
1340 -- New_Private_Type --
1341 ----------------------
1343 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
1347 if Limited_Present
(Def
) then
1348 Set_Ekind
(Id
, E_Limited_Private_Type
);
1350 Set_Ekind
(Id
, E_Private_Type
);
1354 Set_Has_Delayed_Freeze
(Id
);
1355 Set_Is_First_Subtype
(Id
);
1356 Init_Size_Align
(Id
);
1358 Set_Is_Constrained
(Id
,
1359 No
(Discriminant_Specifications
(N
))
1360 and then not Unknown_Discriminants_Present
(N
));
1362 -- Set tagged flag before processing discriminants, to catch
1365 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
1367 Set_Discriminant_Constraint
(Id
, No_Elist
);
1368 Set_Girder_Constraint
(Id
, No_Elist
);
1370 if Present
(Discriminant_Specifications
(N
)) then
1372 Process_Discriminants
(N
);
1375 elsif Unknown_Discriminants_Present
(N
) then
1376 Set_Has_Unknown_Discriminants
(Id
);
1379 Set_Private_Dependents
(Id
, New_Elmt_List
);
1381 if Tagged_Present
(Def
) then
1382 Set_Ekind
(Id
, E_Record_Type_With_Private
);
1383 Make_Class_Wide_Type
(Id
);
1384 Set_Primitive_Operations
(Id
, New_Elmt_List
);
1385 Set_Is_Abstract
(Id
, Abstract_Present
(Def
));
1386 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
1387 Set_Has_Delayed_Freeze
(Id
, True);
1389 elsif Abstract_Present
(Def
) then
1390 Error_Msg_N
("only a tagged type can be abstract", N
);
1392 end New_Private_Type
;
1394 ------------------------------
1395 -- Preserve_Full_Attributes --
1396 ------------------------------
1398 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
1399 Priv_Is_Base_Type
: constant Boolean := Priv
= Base_Type
(Priv
);
1402 Set_Size_Info
(Priv
, (Full
));
1403 Set_RM_Size
(Priv
, RM_Size
(Full
));
1404 Set_Size_Known_At_Compile_Time
(Priv
, Size_Known_At_Compile_Time
1407 if Priv_Is_Base_Type
then
1408 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
1409 Set_Finalize_Storage_Only
(Priv
, Finalize_Storage_Only
1410 (Base_Type
(Full
)));
1411 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
1412 Set_Has_Controlled_Component
(Priv
, Has_Controlled_Component
1413 (Base_Type
(Full
)));
1416 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
1418 if Is_Tagged_Type
(Priv
)
1419 and then Is_Tagged_Type
(Full
)
1420 and then not Error_Posted
(Full
)
1422 if Priv_Is_Base_Type
then
1423 Set_Access_Disp_Table
(Priv
, Access_Disp_Table
1424 (Base_Type
(Full
)));
1427 Set_First_Entity
(Priv
, First_Entity
(Full
));
1428 Set_Last_Entity
(Priv
, Last_Entity
(Full
));
1430 end Preserve_Full_Attributes
;
1432 ----------------------------
1433 -- Uninstall_Declarations --
1434 ----------------------------
1436 procedure Uninstall_Declarations
(P
: Entity_Id
) is
1438 Decl
: Node_Id
:= Unit_Declaration_Node
(P
);
1440 Priv_Elmt
: Elmt_Id
;
1441 Priv_Sub
: Entity_Id
;
1443 function Type_In_Use
(T
: Entity_Id
) return Boolean;
1444 -- Check whether type or base type appear in an active use_type clause.
1446 function Type_In_Use
(T
: Entity_Id
) return Boolean is
1448 return Scope
(Base_Type
(T
)) = P
1449 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
1452 -- Start of processing for Uninstall_Declarations
1455 Id
:= First_Entity
(P
);
1457 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1458 if Debug_Flag_E
then
1459 Write_Str
("unlinking visible entity ");
1460 Write_Int
(Int
(Id
));
1464 -- On exit from the package scope, we must preserve the visibility
1465 -- established by use clauses in the current scope. Two cases:
1467 -- a) If the entity is an operator, it may be a primitive operator of
1468 -- a type for which there is a visible use-type clause.
1470 -- b) for other entities, their use-visibility is determined by a
1471 -- visible use clause for the package itself. For a generic instance,
1472 -- the instantiation of the formals appears in the visible part,
1473 -- but the formals are private and remain so.
1475 if Ekind
(Id
) = E_Function
1476 and then Is_Operator_Symbol_Name
(Chars
(Id
))
1477 and then not Is_Hidden
(Id
)
1479 Set_Is_Potentially_Use_Visible
(Id
,
1481 or else Type_In_Use
(Etype
(Id
))
1482 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
1483 or else (Present
(Next_Formal
(First_Formal
(Id
)))
1486 (Etype
(Next_Formal
(First_Formal
(Id
))))));
1488 Set_Is_Potentially_Use_Visible
(Id
,
1489 In_Use
(P
) and not Is_Hidden
(Id
));
1492 -- Local entities are not immediately visible outside of the package.
1494 Set_Is_Immediately_Visible
(Id
, False);
1496 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
1497 Check_Abstract_Overriding
(Id
);
1500 if (Ekind
(Id
) = E_Private_Type
1501 or else Ekind
(Id
) = E_Limited_Private_Type
)
1502 and then No
(Full_View
(Id
))
1503 and then not Is_Generic_Type
(Id
)
1504 and then not Is_Derived_Type
(Id
)
1506 Error_Msg_N
("missing full declaration for private type&", Id
);
1508 elsif Ekind
(Id
) = E_Record_Type_With_Private
1509 and then not Is_Generic_Type
(Id
)
1510 and then No
(Full_View
(Id
))
1512 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
1513 Error_Msg_N
("missing full declaration for private type&", Id
);
1516 ("missing full declaration for private extension", Id
);
1519 elsif Ekind
(Id
) = E_Constant
1520 and then No
(Constant_Value
(Id
))
1521 and then No
(Full_View
(Id
))
1522 and then not Is_Imported
(Id
)
1523 and then (Nkind
(Parent
(Id
)) /= N_Object_Declaration
1524 or else not No_Initialization
(Parent
(Id
)))
1526 Error_Msg_N
("missing full declaration for deferred constant", Id
);
1532 -- If the specification was installed as the parent of a public child
1533 -- unit, the private declarations were not installed, and there is
1536 if not In_Private_Part
(P
) then
1539 Set_In_Private_Part
(P
, False);
1542 -- Make private entities invisible and exchange full and private
1543 -- declarations for private types.
1545 while Present
(Id
) loop
1546 if Debug_Flag_E
then
1547 Write_Str
("unlinking private entity ");
1548 Write_Int
(Int
(Id
));
1552 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
1553 Check_Abstract_Overriding
(Id
);
1556 Set_Is_Immediately_Visible
(Id
, False);
1558 if Is_Private_Base_Type
(Id
)
1559 and then Present
(Full_View
(Id
))
1561 Full
:= Full_View
(Id
);
1563 -- If the partial view is not declared in the visible part
1564 -- of the package (as is the case when it is a type derived
1565 -- from some other private type in the private part if the
1566 -- current package), no exchange takes place.
1569 or else List_Containing
(Parent
(Id
))
1570 /= Visible_Declarations
(Specification
(Decl
))
1575 -- The entry in the private part points to the full declaration,
1576 -- which is currently visible. Exchange them so only the private
1577 -- type declaration remains accessible, and link private and
1578 -- full declaration in the opposite direction. Before the actual
1579 -- exchange, we copy back attributes of the full view that
1580 -- must be available to the partial view too.
1582 Preserve_Full_Attributes
(Id
, Full
);
1584 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
1586 if Is_Indefinite_Subtype
(Full
)
1587 and then not Is_Indefinite_Subtype
(Id
)
1590 ("full view of type must be definite subtype", Full
);
1593 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1594 Exchange_Declarations
(Id
);
1596 -- Swap out the subtypes and derived types of Id that were
1597 -- compiled in this scope, or installed previously by
1598 -- Install_Private_Declarations.
1599 -- Before we do the swap, we verify the presence of the
1600 -- Full_View field which may be empty due to a swap by
1601 -- a previous call to End_Package_Scope (e.g. from the
1602 -- freezing mechanism).
1604 while Present
(Priv_Elmt
) loop
1605 Priv_Sub
:= Node
(Priv_Elmt
);
1607 if Present
(Full_View
(Priv_Sub
)) then
1609 if Scope
(Priv_Sub
) = P
1610 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
1612 Set_Is_Immediately_Visible
(Priv_Sub
, False);
1615 if Is_Visible_Dependent
(Priv_Sub
) then
1616 Preserve_Full_Attributes
1617 (Priv_Sub
, Full_View
(Priv_Sub
));
1618 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
1619 Exchange_Declarations
(Priv_Sub
);
1623 Next_Elmt
(Priv_Elmt
);
1626 elsif Ekind
(Id
) = E_Incomplete_Type
1627 and then No
(Full_View
(Id
))
1629 -- Mark Taft amendment types
1631 Set_Has_Completion_In_Body
(Id
);
1633 elsif not Is_Child_Unit
(Id
)
1634 and then (not Is_Private_Type
(Id
)
1635 or else No
(Full_View
(Id
)))
1638 Set_Is_Potentially_Use_Visible
(Id
, False);
1645 end Uninstall_Declarations
;
1647 ------------------------
1648 -- Unit_Requires_Body --
1649 ------------------------
1651 function Unit_Requires_Body
(P
: Entity_Id
) return Boolean is
1655 -- Imported entity never requires body. Right now, only
1656 -- subprograms can be imported, but perhaps in the future
1657 -- we will allow import of packages.
1659 if Is_Imported
(P
) then
1662 -- Body required if library package with pragma Elaborate_Body
1664 elsif Has_Pragma_Elaborate_Body
(P
) then
1667 -- Body required if subprogram
1669 elsif (Is_Subprogram
(P
)
1671 Ekind
(P
) = E_Generic_Function
1673 Ekind
(P
) = E_Generic_Procedure
)
1677 -- Treat a block as requiring a body
1679 elsif Ekind
(P
) = E_Block
then
1682 elsif Ekind
(P
) = E_Package
1683 and then Nkind
(Parent
(P
)) = N_Package_Specification
1684 and then Present
(Generic_Parent
(Parent
(P
)))
1687 G_P
: Entity_Id
:= Generic_Parent
(Parent
(P
));
1690 if Has_Pragma_Elaborate_Body
(G_P
) then
1696 -- Otherwise search entity chain for entity requiring completion.
1698 E
:= First_Entity
(P
);
1699 while Present
(E
) loop
1701 -- Always ignore child units. Child units get added to the entity
1702 -- list of a parent unit, but are not original entities of the
1703 -- parent, and so do not affect whether the parent needs a body.
1705 if Is_Child_Unit
(E
) then
1708 -- Otherwise test to see if entity requires a completion
1710 elsif (Is_Overloadable
(E
)
1711 and then Ekind
(E
) /= E_Enumeration_Literal
1712 and then Ekind
(E
) /= E_Operator
1713 and then not Is_Abstract
(E
)
1714 and then not Has_Completion
(E
))
1717 (Ekind
(E
) = E_Package
1719 and then not Has_Completion
(E
)
1720 and then Unit_Requires_Body
(E
))
1723 (Ekind
(E
) = E_Incomplete_Type
and then No
(Full_View
(E
)))
1726 ((Ekind
(E
) = E_Task_Type
or else
1727 Ekind
(E
) = E_Protected_Type
)
1728 and then not Has_Completion
(E
))
1731 (Ekind
(E
) = E_Generic_Package
and then E
/= P
1732 and then not Has_Completion
(E
)
1733 and then Unit_Requires_Body
(E
))
1736 (Ekind
(E
) = E_Generic_Function
1737 and then not Has_Completion
(E
))
1740 (Ekind
(E
) = E_Generic_Procedure
1741 and then not Has_Completion
(E
))
1746 -- Entity that does not require completion
1756 end Unit_Requires_Body
;