1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
10 -- Copyright (C) 1992-2002, Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- GNAT was originally developed by the GNAT team at New York University. --
24 -- Extensive contributions were provided by Ada Core Technologies Inc. --
26 ------------------------------------------------------------------------------
28 -- This package contains the routines to process package specifications and
29 -- bodies. The most important semantic aspects of package processing are the
30 -- handling of private and full declarations, and the construction of
31 -- dispatch tables for tagged types.
33 with Atree
; use Atree
;
34 with Debug
; use Debug
;
35 with Einfo
; use Einfo
;
36 with Elists
; use Elists
;
37 with Errout
; use Errout
;
38 with Exp_Disp
; use Exp_Disp
;
39 with Exp_Dbug
; use Exp_Dbug
;
41 with Lib
.Xref
; use Lib
.Xref
;
42 with Namet
; use Namet
;
43 with Nmake
; use Nmake
;
44 with Nlists
; use Nlists
;
46 with Output
; use Output
;
48 with Sem_Cat
; use Sem_Cat
;
49 with Sem_Ch3
; use Sem_Ch3
;
50 with Sem_Ch6
; use Sem_Ch6
;
51 with Sem_Ch8
; use Sem_Ch8
;
52 with Sem_Ch12
; use Sem_Ch12
;
53 with Sem_Util
; use Sem_Util
;
54 with Sem_Warn
; use Sem_Warn
;
55 with Snames
; use Snames
;
56 with Stand
; use Stand
;
57 with Sinfo
; use Sinfo
;
58 with Sinput
; use Sinput
;
61 package body Sem_Ch7
is
63 -----------------------------------
64 -- Handling private declarations --
65 -----------------------------------
67 -- The principle that each entity has a single defining occurrence clashes
68 -- with the presence of two separate definitions for private types: the
69 -- first is the private type declaration, and the second is the full type
70 -- declaration. It is important that all references to the type point to
71 -- the same defining occurrence, namely the first one. To enforce the two
72 -- separate views of the entity, the corresponding information is swapped
73 -- between the two declarations. Outside of the package, the defining
74 -- occurrence only contains the private declaration information, while in
75 -- the private part and the body of the package the defining occurrence
76 -- contains the full declaration. To simplify the swap, the defining
77 -- occurrence that currently holds the private declaration points to the
78 -- full declaration. During semantic processing the defining occurrence
79 -- also points to a list of private dependents, that is to say access types
80 -- or composite types whose designated types or component types are
81 -- subtypes or derived types of the private type in question. After the
82 -- full declaration has been seen, the private dependents are updated to
83 -- indicate that they have full definitions.
85 -----------------------
86 -- Local Subprograms --
87 -----------------------
89 procedure Install_Composite_Operations
(P
: Entity_Id
);
90 -- Composite types declared in the current scope may depend on
91 -- types that were private at the point of declaration, and whose
92 -- full view is now in scope. Indicate that the corresponding
93 -- operations on the composite type are available.
95 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
96 -- True for a private type that is not a subtype.
98 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
99 -- If the private dependent is a private type whose full view is
100 -- derived from the parent type, its full properties are revealed
101 -- only if we are in the immediate scope of the private dependent.
102 -- Should this predicate be tightened further???
104 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
105 -- Copy to the private declaration the attributes of the full view
106 -- that need to be available for the partial view also.
108 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
109 -- Called upon entering the private part of a public child package
110 -- and the body of a nested package, to potentially declare certain
111 -- inherited subprograms that were inherited by types in the visible
112 -- part, but whose declaration was deferred because the parent
113 -- operation was private and not visible at that point. These
114 -- subprograms are located by traversing the visible part declarations
115 -- looking for nonprivate type extensions and then examining each of
116 -- the primitive operations of such types to find those that were
117 -- inherited but declared with a special internal name. Each such
118 -- operation is now declared as an operation with a normal name (using
119 -- the name of the parent operation) and replaces the previous implicit
120 -- operation in the primitive operations list of the type. If the
121 -- inherited private operation has been overridden, then it's
122 -- replaced by the overriding operation.
124 --------------------------
125 -- Analyze_Package_Body --
126 --------------------------
128 procedure Analyze_Package_Body
(N
: Node_Id
) is
129 Loc
: constant Source_Ptr
:= Sloc
(N
);
133 Last_Spec_Entity
: Entity_Id
;
138 -- Find corresponding package specification, and establish the
139 -- current scope. The visible defining entity for the package is the
140 -- defining occurrence in the spec. On exit from the package body, all
141 -- body declarations are attached to the defining entity for the body,
142 -- but the later is never used for name resolution. In this fashion
143 -- there is only one visible entity that denotes the package.
146 Write_Str
("==== Compiling package body ");
147 Write_Name
(Chars
(Defining_Entity
(N
)));
148 Write_Str
(" from ");
149 Write_Location
(Loc
);
153 -- Set Body_Id. Note that this will be reset to point to the
154 -- generic copy later on in the generic case.
156 Body_Id
:= Defining_Entity
(N
);
158 if Present
(Corresponding_Spec
(N
)) then
160 -- Body is body of package instantiation. Corresponding spec
161 -- has already been set.
163 Spec_Id
:= Corresponding_Spec
(N
);
164 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
167 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
170 and then Is_Package
(Spec_Id
)
172 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
174 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
175 Error_Msg_N
("cannot supply body for package renaming", N
);
178 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
179 Error_Msg_N
("redefinition of package body", N
);
184 Error_Msg_N
("missing specification for package body", N
);
188 if Is_Package
(Spec_Id
)
190 (Scope
(Spec_Id
) = Standard_Standard
191 or else Is_Child_Unit
(Spec_Id
))
192 and then not Unit_Requires_Body
(Spec_Id
)
196 ("optional package body (not allowed in Ada 95)?", N
);
199 ("spec of this package does not allow a body", N
);
204 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
205 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
207 if Is_Child_Unit
(Spec_Id
) then
209 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
211 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
214 Set_Is_Child_Unit
(Body_Id
);
217 -- Generic package case
219 if Ekind
(Spec_Id
) = E_Generic_Package
then
221 -- Disable expansion and perform semantic analysis on copy.
222 -- The unannotated body will be used in all instantiations.
224 Body_Id
:= Defining_Entity
(N
);
225 Set_Ekind
(Body_Id
, E_Package_Body
);
226 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
227 Set_Body_Entity
(Spec_Id
, Body_Id
);
228 Set_Spec_Entity
(Body_Id
, Spec_Id
);
230 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
233 -- Update Body_Id to point to the copied node for the remainder
234 -- of the processing.
236 Body_Id
:= Defining_Entity
(N
);
240 -- The Body_Id is that of the copied node in the generic case, the
241 -- current node otherwise. Note that N was rewritten above, so we
242 -- must be sure to get the latest Body_Id value.
244 Set_Ekind
(Body_Id
, E_Package_Body
);
245 Set_Body_Entity
(Spec_Id
, Body_Id
);
246 Set_Spec_Entity
(Body_Id
, Spec_Id
);
248 -- Defining name for the package body is not a visible entity: Only
249 -- the defining name for the declaration is visible.
251 Set_Etype
(Body_Id
, Standard_Void_Type
);
252 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
253 Set_Corresponding_Spec
(N
, Spec_Id
);
254 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
256 -- The body entity is not used for semantics or code generation, but
257 -- it is attached to the entity list of the enclosing scope to simplify
258 -- the listing of back-annotations for the types it main contain.
260 if Scope
(Spec_Id
) /= Standard_Standard
then
261 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
264 -- Indicate that we are currently compiling the body of the package.
266 Set_In_Package_Body
(Spec_Id
);
267 Set_Has_Completion
(Spec_Id
);
268 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
272 Set_Categorization_From_Pragmas
(N
);
274 Install_Visible_Declarations
(Spec_Id
);
275 Install_Private_Declarations
(Spec_Id
);
276 Install_Composite_Operations
(Spec_Id
);
278 if Ekind
(Spec_Id
) = E_Generic_Package
then
279 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
282 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
283 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
285 -- This is a nested package, so it may be necessary to declare
286 -- certain inherited subprograms that are not yet visible because
287 -- the parent type's subprograms are now visible.
289 if Ekind
(Scope
(Spec_Id
)) = E_Package
290 and then Scope
(Spec_Id
) /= Standard_Standard
292 Declare_Inherited_Private_Subprograms
(Spec_Id
);
295 if Present
(Declarations
(N
)) then
296 Analyze_Declarations
(Declarations
(N
));
299 HSS
:= Handled_Statement_Sequence
(N
);
301 if Present
(HSS
) then
302 Process_End_Label
(HSS
, 't', Spec_Id
);
305 -- Check that elaboration code in a preelaborable package body is
306 -- empty other than null statements and labels (RM 10.2.1(6)).
308 Validate_Null_Statement_Sequence
(N
);
311 Validate_Categorization_Dependency
(N
, Spec_Id
);
312 Check_Completion
(Body_Id
);
314 -- Generate start of body reference. Note that we do this fairly late,
315 -- because the call will use In_Extended_Main_Source_Unit as a check,
316 -- and we want to make sure that Corresponding_Stub links are set
318 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
320 -- For a generic package, collect global references and mark
321 -- them on the original body so that they are not resolved
322 -- again at the point of instantiation.
324 if Ekind
(Spec_Id
) /= E_Package
then
325 Save_Global_References
(Original_Node
(N
));
329 -- The entities of the package body have so far been chained onto
330 -- the declaration chain for the spec. That's been fine while we
331 -- were in the body, since we wanted them to be visible, but now
332 -- that we are leaving the package body, they are no longer visible,
333 -- so we remove them from the entity chain of the package spec entity,
334 -- and copy them to the entity chain of the package body entity, where
335 -- they will never again be visible.
337 if Present
(Last_Spec_Entity
) then
338 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
339 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
340 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
341 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
344 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
345 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
346 Set_First_Entity
(Spec_Id
, Empty
);
347 Set_Last_Entity
(Spec_Id
, Empty
);
350 End_Package_Scope
(Spec_Id
);
352 -- All entities declared in body are not visible.
358 E
:= First_Entity
(Body_Id
);
360 while Present
(E
) loop
361 Set_Is_Immediately_Visible
(E
, False);
362 Set_Is_Potentially_Use_Visible
(E
, False);
365 -- Child units may appear on the entity list (for example if
366 -- they appear in the context of a subunit) but they are not
369 if not Is_Child_Unit
(E
) then
370 Set_Is_Package_Body_Entity
(E
);
377 Check_References
(Body_Id
);
379 -- The processing so far has made all entities of the package body
380 -- public (i.e. externally visible to the linker). This is in general
381 -- necessary, since inlined or generic bodies, for which code is
382 -- generated in other units, may need to see these entities. The
383 -- following loop runs backwards from the end of the entities of the
384 -- package body making these entities invisible until we reach a
385 -- referencer, i.e. a declaration that could reference a previous
386 -- declaration, a generic body or an inlined body, or a stub (which
387 -- may contain either of these). This is of course an approximation,
388 -- but it is conservative and definitely correct.
390 -- We only do this at the outer (library) level non-generic packages.
391 -- The reason is simply to cut down on the number of external symbols
392 -- generated, so this is simply an optimization of the efficiency
393 -- of the compilation process. It has no other effect.
395 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
396 and then not Is_Generic_Unit
(Spec_Id
)
397 and then Present
(Declarations
(N
))
399 Make_Non_Public_Where_Possible
: declare
402 function Has_Referencer
406 -- Traverse the given list of declarations in reverse order.
407 -- Return True as soon as a referencer is reached. Return
408 -- False if none is found. The Outer parameter is True for
409 -- the outer level call, and False for inner level calls for
410 -- nested packages. If Outer is True, then any entities up
411 -- to the point of hitting a referencer get their Is_Public
412 -- flag cleared, so that the entities will be treated as
413 -- static entities in the C sense, and need not have fully
414 -- qualified names. For inner levels, we need all names to
415 -- be fully qualified to deal with the same name appearing
416 -- in parallel packages (right now this is tied to their
423 function Has_Referencer
440 while Present
(D
) loop
443 if K
in N_Body_Stub
then
446 elsif K
= N_Subprogram_Body
then
447 if Acts_As_Spec
(D
) then
448 E
:= Defining_Entity
(D
);
450 -- An inlined body acts as a referencer. Note also
451 -- that we never reset Is_Public for an inlined
452 -- subprogram. Gigi requires Is_Public to be set.
454 -- Note that we test Has_Pragma_Inline here rather
455 -- than Is_Inlined. We are compiling this for a
456 -- client, and it is the client who will decide
457 -- if actual inlining should occur, so we need to
458 -- assume that the procedure could be inlined for
459 -- the purpose of accessing global entities.
461 if Has_Pragma_Inline
(E
) then
464 Set_Is_Public
(E
, False);
468 E
:= Corresponding_Spec
(D
);
471 and then (Is_Generic_Unit
(E
)
472 or else Has_Pragma_Inline
(E
)
473 or else Is_Inlined
(E
))
479 -- Processing for package bodies
481 elsif K
= N_Package_Body
482 and then Present
(Corresponding_Spec
(D
))
484 E
:= Corresponding_Spec
(D
);
486 -- Generic package body is a referencer. It would
487 -- seem that we only have to consider generics that
488 -- can be exported, i.e. where the corresponding spec
489 -- is the spec of the current package, but because of
490 -- nested instantiations, a fully private generic
491 -- body may export other private body entities.
493 if Is_Generic_Unit
(E
) then
496 -- For non-generic package body, recurse into body
497 -- unless this is an instance, we ignore instances
498 -- since they cannot have references that affect
501 elsif not Is_Generic_Instance
(E
) then
503 (Declarations
(D
), Outer
=> False)
509 -- Processing for package specs, recurse into declarations.
510 -- Again we skip this for the case of generic instances.
512 elsif K
= N_Package_Declaration
then
513 S
:= Specification
(D
);
515 if not Is_Generic_Unit
(Defining_Entity
(S
)) then
517 (Private_Declarations
(S
), Outer
=> False)
521 (Visible_Declarations
(S
), Outer
=> False)
527 -- Objects and exceptions need not be public if we have
528 -- not encountered a referencer so far. We only reset
529 -- the flag for outer level entities that are not
530 -- imported/exported, and which have no interface name.
532 elsif K
= N_Object_Declaration
533 or else K
= N_Exception_Declaration
534 or else K
= N_Subprogram_Declaration
536 E
:= Defining_Entity
(D
);
539 and then not Is_Imported
(E
)
540 and then not Is_Exported
(E
)
541 and then No
(Interface_Name
(E
))
543 Set_Is_Public
(E
, False);
553 -- Start of processing for Make_Non_Public_Where_Possible
556 Discard
:= Has_Referencer
(Declarations
(N
), Outer
=> True);
557 end Make_Non_Public_Where_Possible
;
560 -- If expander is not active, then here is where we turn off the
561 -- In_Package_Body flag, otherwise it is turned off at the end of
562 -- the corresponding expansion routine. If this is an instance body,
563 -- we need to qualify names of local entities, because the body may
564 -- have been compiled as a preliminary to another instantiation.
566 if not Expander_Active
then
567 Set_In_Package_Body
(Spec_Id
, False);
569 if Is_Generic_Instance
(Spec_Id
)
570 and then Operating_Mode
= Generate_Code
572 Qualify_Entity_Names
(N
);
575 end Analyze_Package_Body
;
577 ---------------------------------
578 -- Analyze_Package_Declaration --
579 ---------------------------------
581 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
582 Id
: constant Node_Id
:= Defining_Entity
(N
);
586 Generate_Definition
(Id
);
588 Set_Ekind
(Id
, E_Package
);
589 Set_Etype
(Id
, Standard_Void_Type
);
592 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
593 Set_Is_Pure
(Id
, PF
);
595 Set_Categorization_From_Pragmas
(N
);
598 Write_Str
("==== Compiling package spec ");
599 Write_Name
(Chars
(Id
));
600 Write_Str
(" from ");
601 Write_Location
(Sloc
(N
));
605 Analyze
(Specification
(N
));
606 Validate_Categorization_Dependency
(N
, Id
);
607 End_Package_Scope
(Id
);
609 -- For a compilation unit, indicate whether it needs a body, and
610 -- whether elaboration warnings may be meaningful on it.
612 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
613 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
615 if not Body_Required
(Parent
(N
)) then
616 Set_Suppress_Elaboration_Warnings
(Id
);
619 Validate_RT_RAT_Component
(N
);
622 -- Clear Not_Source_Assigned on all variables in the package spec,
623 -- because at this stage some client, or the body, or a child package,
624 -- may modify variables in the declaration. Note that we wait till now
625 -- to reset these flags, because during analysis of the declaration,
626 -- the flags correctly indicated the status up to that point. We
627 -- similarly clear any Is_True_Constant indications.
633 E
:= First_Entity
(Id
);
634 while Present
(E
) loop
635 if Ekind
(E
) = E_Variable
then
636 Set_Not_Source_Assigned
(E
, False);
637 Set_Is_True_Constant
(E
, False);
643 end Analyze_Package_Declaration
;
645 -----------------------------------
646 -- Analyze_Package_Specification --
647 -----------------------------------
649 procedure Analyze_Package_Specification
(N
: Node_Id
) is
650 Id
: constant Entity_Id
:= Defining_Entity
(N
);
651 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
652 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
653 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
656 Public_Child
: Boolean := False;
658 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
659 -- Child and Unit are entities of compilation units. True if Child
660 -- is a public child of Parent as defined in 10.1.1
662 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
664 if not Is_Private_Descendant
(Child
) then
668 return not Private_Present
(
669 Parent
(Unit_Declaration_Node
(Child
)));
671 return Is_Public_Child
(Scope
(Child
), Unit
);
676 -- Start of processing for Analyze_Package_Specification
679 if Present
(Vis_Decls
) then
680 Analyze_Declarations
(Vis_Decls
);
683 -- Verify that incomplete types have received full declarations.
685 E
:= First_Entity
(Id
);
687 while Present
(E
) loop
688 if Ekind
(E
) = E_Incomplete_Type
689 and then No
(Full_View
(E
))
691 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
697 if Is_Remote_Call_Interface
(Id
)
698 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
700 Validate_RCI_Declarations
(Id
);
703 -- Save global references in the visible declarations, before
704 -- installing private declarations of parent unit if there is one,
705 -- because the privacy status of types defined in the parent will
706 -- change. This is only relevant for generic child units, but is
707 -- done in all cases for uniformity.
709 if Ekind
(Id
) = E_Generic_Package
710 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
713 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
714 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
717 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
718 Save_Global_References
(Orig_Decl
);
719 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
723 -- If package is a public child unit, then make the private
724 -- declarations of the parent visible.
726 if Present
(Parent_Spec
(Parent
(N
))) then
728 Par
: Entity_Id
:= Id
;
732 while Scope
(Par
) /= Standard_Standard
733 and then Is_Public_Child
(Id
, Par
)
735 Public_Child
:= True;
737 Install_Private_Declarations
(Par
);
738 Pack_Decl
:= Unit_Declaration_Node
(Par
);
739 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
744 -- Analyze private part if present. The flag In_Private_Part is
745 -- reset in End_Package_Scope.
747 L
:= Last_Entity
(Id
);
749 if Present
(Priv_Decls
) then
750 L
:= Last_Entity
(Id
);
751 Set_In_Private_Part
(Id
);
753 -- Upon entering a public child's private part, it may be
754 -- necessary to declare subprograms that were derived in
755 -- the package visible part but not yet made visible.
758 Declare_Inherited_Private_Subprograms
(Id
);
761 Analyze_Declarations
(Priv_Decls
);
763 -- The first private entity is the immediate follower of the last
764 -- visible entity, if there was one.
767 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
769 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
772 -- There may be inherited private subprograms that need to be
773 -- declared, even in the absence of an explicit private part.
774 -- If there are any public declarations in the package and
775 -- the package is a public child unit, then an implicit private
778 elsif Present
(L
) and then Public_Child
then
779 Set_In_Private_Part
(Id
);
780 Declare_Inherited_Private_Subprograms
(Id
);
781 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
784 -- Check rule of 3.6(11), which in general requires
785 -- waiting till all full types have been seen.
787 E
:= First_Entity
(Id
);
788 while Present
(E
) loop
789 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
790 Check_Aliased_Component_Types
(E
);
796 if Ekind
(Id
) = E_Generic_Package
797 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
798 and then Present
(Priv_Decls
)
800 -- Save global references in private declarations, ignoring the
801 -- visible declarations that were processed earlier.
804 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
805 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
806 Save_Form
: constant List_Id
:=
807 Generic_Formal_Declarations
(Orig_Decl
);
810 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
811 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
812 Save_Global_References
(Orig_Decl
);
813 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
814 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
818 Process_End_Label
(N
, 'e', Id
);
819 end Analyze_Package_Specification
;
821 --------------------------------------
822 -- Analyze_Private_Type_Declaration --
823 --------------------------------------
825 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
826 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
827 Id
: Entity_Id
:= Defining_Identifier
(N
);
830 Generate_Definition
(Id
);
831 Set_Is_Pure
(Id
, PF
);
832 Init_Size_Align
(Id
);
834 if (Ekind
(Current_Scope
) /= E_Package
835 and then Ekind
(Current_Scope
) /= E_Generic_Package
)
836 or else In_Private_Part
(Current_Scope
)
838 Error_Msg_N
("invalid context for private declaration", N
);
841 New_Private_Type
(N
, Id
, N
);
842 Set_Depends_On_Private
(Id
);
843 Set_Has_Delayed_Freeze
(Id
);
845 end Analyze_Private_Type_Declaration
;
847 -------------------------------------------
848 -- Declare_Inherited_Private_Subprograms --
849 -------------------------------------------
851 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
858 Parent_Subp
: Entity_Id
;
859 Found_Explicit
: Boolean;
860 Decl_Privates
: Boolean;
862 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
863 -- Check whether an inherited subprogram is an operation of an
864 -- untagged derived type.
866 ---------------------
867 -- Is_Primitive_Of --
868 ---------------------
870 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
874 if Etype
(S
) = T
then
878 Formal
:= First_Formal
(S
);
880 while Present
(Formal
) loop
881 if Etype
(Formal
) = T
then
885 Next_Formal
(Formal
);
892 -- Start of processing for Declare_Inherited_Private_Subprograms
895 E
:= First_Entity
(Id
);
897 while Present
(E
) loop
899 -- If the entity is a nonprivate type extension whose parent
900 -- type is declared in an open scope, then the type may have
901 -- inherited operations that now need to be made visible.
902 -- Ditto if the entity is a formal derived type in a child unit.
904 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
906 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
907 and then Is_Generic_Type
(E
)))
908 and then In_Open_Scopes
(Scope
(Etype
(E
)))
909 and then E
= Base_Type
(E
)
911 if Is_Tagged_Type
(E
) then
912 Op_List
:= Primitive_Operations
(E
);
913 Op_Elmt
:= First_Elmt
(Op_List
);
915 Decl_Privates
:= False;
917 while Present
(Op_Elmt
) loop
918 Prim_Op
:= Node
(Op_Elmt
);
920 -- If the primitive operation is an implicit operation
921 -- with an internal name whose parent operation has
922 -- a normal name, then we now need to either declare the
923 -- operation (i.e., make it visible), or replace it
924 -- by an overriding operation if one exists.
926 if Present
(Alias
(Prim_Op
))
927 and then not Comes_From_Source
(Prim_Op
)
928 and then Is_Internal_Name
(Chars
(Prim_Op
))
929 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
931 Parent_Subp
:= Alias
(Prim_Op
);
933 Found_Explicit
:= False;
934 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
935 while Present
(Op_Elmt_2
) loop
936 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
937 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
939 -- The private inherited operation has been
940 -- overridden by an explicit subprogram, so
941 -- change the private op's list element to
942 -- designate the explicit so the explicit
943 -- one will get the right dispatching slot.
945 New_Op
:= Node
(Op_Elmt_2
);
946 Replace_Elmt
(Op_Elmt
, New_Op
);
947 Remove_Elmt
(Op_List
, Op_Elmt_2
);
948 Found_Explicit
:= True;
949 Decl_Privates
:= True;
953 Next_Elmt
(Op_Elmt_2
);
956 if not Found_Explicit
then
958 (New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
961 (Is_Dispatching_Operation
(New_Op
)
962 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
964 -- Substitute the new operation for the old one
965 -- in the type's primitive operations list. Since
966 -- the new operation was also just added to the end
967 -- of list, the last element must be removed.
969 -- (Question: is there a simpler way of declaring
970 -- the operation, say by just replacing the name
971 -- of the earlier operation, reentering it in the
972 -- in the symbol table (how?), and marking it as
975 Replace_Elmt
(Op_Elmt
, New_Op
);
976 Remove_Last_Elmt
(Op_List
);
977 Decl_Privates
:= True;
984 -- The type's DT attributes need to be recalculated
985 -- in the case where private dispatching operations
986 -- have been added or overridden. Normally this action
987 -- occurs during type freezing, but we force it here
988 -- since the type may already have been frozen (e.g.,
989 -- if the type's package has an empty private part).
990 -- This can only be done if expansion is active, otherwise
991 -- Tag may not be present.
994 and then Expander_Active
996 Set_All_DT_Position
(E
);
1000 -- Non-tagged type, scan forward to locate
1001 -- inherited hidden operations.
1003 Prim_Op
:= Next_Entity
(E
);
1005 while Present
(Prim_Op
) loop
1006 if Is_Subprogram
(Prim_Op
)
1007 and then Present
(Alias
(Prim_Op
))
1008 and then not Comes_From_Source
(Prim_Op
)
1009 and then Is_Internal_Name
(Chars
(Prim_Op
))
1010 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1011 and then Is_Primitive_Of
(E
, Prim_Op
)
1013 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1016 Next_Entity
(Prim_Op
);
1023 end Declare_Inherited_Private_Subprograms
;
1025 -----------------------
1026 -- End_Package_Scope --
1027 -----------------------
1029 procedure End_Package_Scope
(P
: Entity_Id
) is
1031 Uninstall_Declarations
(P
);
1033 end End_Package_Scope
;
1035 ---------------------------
1036 -- Exchange_Declarations --
1037 ---------------------------
1039 procedure Exchange_Declarations
(Id
: Entity_Id
) is
1040 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
1041 H1
: constant Entity_Id
:= Homonym
(Id
);
1042 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
1047 -- If missing full declaration for type, nothing to exchange
1049 if No
(Full_Id
) then
1053 -- Otherwise complete the exchange, and preserve semantic links
1055 Next2
:= Next_Entity
(Full_Id
);
1056 H2
:= Homonym
(Full_Id
);
1058 -- Reset full declaration pointer to reflect the switched entities
1059 -- and readjust the next entity chains.
1061 Exchange_Entities
(Id
, Full_Id
);
1063 Set_Next_Entity
(Id
, Next1
);
1064 Set_Homonym
(Id
, H1
);
1066 Set_Full_View
(Full_Id
, Id
);
1067 Set_Next_Entity
(Full_Id
, Next2
);
1068 Set_Homonym
(Full_Id
, H2
);
1069 end Exchange_Declarations
;
1071 ----------------------------------
1072 -- Install_Composite_Operations --
1073 ----------------------------------
1075 procedure Install_Composite_Operations
(P
: Entity_Id
) is
1079 Id
:= First_Entity
(P
);
1081 while Present
(Id
) loop
1084 and then (Is_Limited_Composite
(Id
)
1085 or else Is_Private_Composite
(Id
))
1086 and then No
(Private_Component
(Id
))
1088 Set_Is_Limited_Composite
(Id
, False);
1089 Set_Is_Private_Composite
(Id
, False);
1094 end Install_Composite_Operations
;
1096 ----------------------------
1097 -- Install_Package_Entity --
1098 ----------------------------
1100 procedure Install_Package_Entity
(Id
: Entity_Id
) is
1102 if not Is_Internal
(Id
) then
1103 if Debug_Flag_E
then
1104 Write_Str
("Install: ");
1105 Write_Name
(Chars
(Id
));
1109 if not Is_Child_Unit
(Id
) then
1110 Set_Is_Immediately_Visible
(Id
);
1114 end Install_Package_Entity
;
1116 ----------------------------------
1117 -- Install_Private_Declarations --
1118 ----------------------------------
1120 procedure Install_Private_Declarations
(P
: Entity_Id
) is
1122 Priv_Elmt
: Elmt_Id
;
1127 -- First exchange declarations for private types, so that the
1128 -- full declaration is visible. For each private type, we check
1129 -- its Private_Dependents list and also exchange any subtypes of
1130 -- or derived types from it. Finally, if this is a Taft amendment
1131 -- type, the incomplete declaration is irrelevant, and we want to
1132 -- link the eventual full declaration with the original private
1133 -- one so we also skip the exchange.
1135 Id
:= First_Entity
(P
);
1137 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1139 if Is_Private_Base_Type
(Id
)
1140 and then Comes_From_Source
(Full_View
(Id
))
1141 and then Present
(Full_View
(Id
))
1142 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
1143 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
1145 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1147 -- If there is a use-type clause on the private type, set the
1148 -- full view accordingly.
1150 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
1151 Full
:= Full_View
(Id
);
1153 if Is_Private_Base_Type
(Full
)
1154 and then Has_Private_Declaration
(Full
)
1155 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
1156 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
1157 and then In_Package_Body
(Current_Scope
)
1158 and then not Is_Private_Type
(Etype
(Full
))
1160 -- This is the completion of a private type by a derivation
1161 -- from another private type which is not private anymore. This
1162 -- can only happen in a package nested within a child package,
1163 -- when the parent type is defined in the parent unit. At this
1164 -- point the current type is not private either, and we have to
1165 -- install the underlying full view, which is now visible.
1167 if No
(Full_View
(Full
))
1168 and then Present
(Underlying_Full_View
(Full
))
1170 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
1171 Set_Underlying_Full_View
(Full
, Empty
);
1172 Set_Is_Frozen
(Full_View
(Id
));
1176 Exchange_Declarations
(Id
);
1177 Set_Is_Immediately_Visible
(Id
);
1179 while Present
(Priv_Elmt
) loop
1180 Priv
:= Node
(Priv_Elmt
);
1182 -- Before the exchange, verify that the presence of the
1183 -- Full_View field. It will be empty if the entity
1184 -- has already been installed due to a previous call.
1186 if Present
(Full_View
(Priv
))
1187 and then Is_Visible_Dependent
(Priv
)
1190 -- For each subtype that is swapped, we also swap the
1191 -- reference to it in Private_Dependents, to allow access
1192 -- to it when we swap them out in End_Package_Scope.
1194 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
1195 Exchange_Declarations
(Priv
);
1196 Set_Is_Immediately_Visible
1197 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
1198 Set_Is_Potentially_Use_Visible
1199 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
1202 Next_Elmt
(Priv_Elmt
);
1211 -- Next make other declarations in the private part visible as well.
1213 Id
:= First_Private_Entity
(P
);
1215 while Present
(Id
) loop
1216 Install_Package_Entity
(Id
);
1220 -- Indicate that the private part is currently visible, so it can be
1221 -- properly reset on exit.
1223 Set_In_Private_Part
(P
);
1224 end Install_Private_Declarations
;
1226 ----------------------------------
1227 -- Install_Visible_Declarations --
1228 ----------------------------------
1230 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
1234 Id
:= First_Entity
(P
);
1236 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1237 Install_Package_Entity
(Id
);
1240 end Install_Visible_Declarations
;
1242 ----------------------
1243 -- Is_Fully_Visible --
1244 ----------------------
1246 -- The full declaration of a private type is visible in the private
1247 -- part of the package declaration, and in the package body, at which
1248 -- point the full declaration must have been given.
1250 function Is_Fully_Visible
(Type_Id
: Entity_Id
) return Boolean is
1251 S
: constant Entity_Id
:= Scope
(Type_Id
);
1254 if Is_Generic_Type
(Type_Id
) then
1257 elsif In_Private_Part
(S
) then
1258 return Present
(Full_View
(Type_Id
));
1261 return In_Package_Body
(S
);
1263 end Is_Fully_Visible
;
1265 --------------------------
1266 -- Is_Private_Base_Type --
1267 --------------------------
1269 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
1271 return Ekind
(E
) = E_Private_Type
1272 or else Ekind
(E
) = E_Limited_Private_Type
1273 or else Ekind
(E
) = E_Record_Type_With_Private
;
1274 end Is_Private_Base_Type
;
1276 --------------------------
1277 -- Is_Visible_Dependent --
1278 --------------------------
1280 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
1282 S
: constant Entity_Id
:= Scope
(Dep
);
1285 -- Renamings created for actual types have the visibility of the
1288 if Ekind
(S
) = E_Package
1289 and then Is_Generic_Instance
(S
)
1290 and then (Is_Generic_Actual_Type
(Dep
)
1291 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
1295 elsif not (Is_Derived_Type
(Dep
))
1296 and then Is_Derived_Type
(Full_View
(Dep
))
1298 return In_Open_Scopes
(S
);
1302 end Is_Visible_Dependent
;
1304 ----------------------------
1305 -- May_Need_Implicit_Body --
1306 ----------------------------
1308 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
1309 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
1310 S
: constant Node_Id
:= Parent
(P
);
1315 if not Has_Completion
(E
)
1316 and then Nkind
(P
) = N_Package_Declaration
1317 and then Present
(Activation_Chain_Entity
(P
))
1320 Make_Package_Body
(Sloc
(E
),
1321 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
1322 Chars
=> Chars
(E
)),
1323 Declarations
=> New_List
);
1325 if Nkind
(S
) = N_Package_Specification
then
1326 if Present
(Private_Declarations
(S
)) then
1327 Decls
:= Private_Declarations
(S
);
1329 Decls
:= Visible_Declarations
(S
);
1332 Decls
:= Declarations
(S
);
1338 end May_Need_Implicit_Body
;
1340 ----------------------
1341 -- New_Private_Type --
1342 ----------------------
1344 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
1348 if Limited_Present
(Def
) then
1349 Set_Ekind
(Id
, E_Limited_Private_Type
);
1351 Set_Ekind
(Id
, E_Private_Type
);
1355 Set_Has_Delayed_Freeze
(Id
);
1356 Set_Is_First_Subtype
(Id
);
1357 Init_Size_Align
(Id
);
1359 Set_Is_Constrained
(Id
,
1360 No
(Discriminant_Specifications
(N
))
1361 and then not Unknown_Discriminants_Present
(N
));
1363 -- Set tagged flag before processing discriminants, to catch
1366 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
1368 Set_Discriminant_Constraint
(Id
, No_Elist
);
1369 Set_Girder_Constraint
(Id
, No_Elist
);
1371 if Present
(Discriminant_Specifications
(N
)) then
1373 Process_Discriminants
(N
);
1376 elsif Unknown_Discriminants_Present
(N
) then
1377 Set_Has_Unknown_Discriminants
(Id
);
1380 Set_Private_Dependents
(Id
, New_Elmt_List
);
1382 if Tagged_Present
(Def
) then
1383 Set_Ekind
(Id
, E_Record_Type_With_Private
);
1384 Make_Class_Wide_Type
(Id
);
1385 Set_Primitive_Operations
(Id
, New_Elmt_List
);
1386 Set_Is_Abstract
(Id
, Abstract_Present
(Def
));
1387 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
1388 Set_Has_Delayed_Freeze
(Id
, True);
1390 elsif Abstract_Present
(Def
) then
1391 Error_Msg_N
("only a tagged type can be abstract", N
);
1393 end New_Private_Type
;
1395 ------------------------------
1396 -- Preserve_Full_Attributes --
1397 ------------------------------
1399 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
1400 Priv_Is_Base_Type
: constant Boolean := Priv
= Base_Type
(Priv
);
1403 Set_Size_Info
(Priv
, (Full
));
1404 Set_RM_Size
(Priv
, RM_Size
(Full
));
1405 Set_Size_Known_At_Compile_Time
(Priv
, Size_Known_At_Compile_Time
1408 if Priv_Is_Base_Type
then
1409 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
1410 Set_Finalize_Storage_Only
(Priv
, Finalize_Storage_Only
1411 (Base_Type
(Full
)));
1412 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
1413 Set_Has_Controlled_Component
(Priv
, Has_Controlled_Component
1414 (Base_Type
(Full
)));
1417 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
1419 if Is_Tagged_Type
(Priv
)
1420 and then Is_Tagged_Type
(Full
)
1421 and then not Error_Posted
(Full
)
1423 if Priv_Is_Base_Type
then
1424 Set_Access_Disp_Table
(Priv
, Access_Disp_Table
1425 (Base_Type
(Full
)));
1428 Set_First_Entity
(Priv
, First_Entity
(Full
));
1429 Set_Last_Entity
(Priv
, Last_Entity
(Full
));
1431 end Preserve_Full_Attributes
;
1433 ----------------------------
1434 -- Uninstall_Declarations --
1435 ----------------------------
1437 procedure Uninstall_Declarations
(P
: Entity_Id
) is
1439 Decl
: Node_Id
:= Unit_Declaration_Node
(P
);
1441 Priv_Elmt
: Elmt_Id
;
1442 Priv_Sub
: Entity_Id
;
1444 function Type_In_Use
(T
: Entity_Id
) return Boolean;
1445 -- Check whether type or base type appear in an active use_type clause.
1447 function Type_In_Use
(T
: Entity_Id
) return Boolean is
1449 return Scope
(Base_Type
(T
)) = P
1450 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
1453 -- Start of processing for Uninstall_Declarations
1456 Id
:= First_Entity
(P
);
1458 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1459 if Debug_Flag_E
then
1460 Write_Str
("unlinking visible entity ");
1461 Write_Int
(Int
(Id
));
1465 -- On exit from the package scope, we must preserve the visibility
1466 -- established by use clauses in the current scope. Two cases:
1468 -- a) If the entity is an operator, it may be a primitive operator of
1469 -- a type for which there is a visible use-type clause.
1471 -- b) for other entities, their use-visibility is determined by a
1472 -- visible use clause for the package itself. For a generic instance,
1473 -- the instantiation of the formals appears in the visible part,
1474 -- but the formals are private and remain so.
1476 if Ekind
(Id
) = E_Function
1477 and then Is_Operator_Symbol_Name
(Chars
(Id
))
1478 and then not Is_Hidden
(Id
)
1480 Set_Is_Potentially_Use_Visible
(Id
,
1482 or else Type_In_Use
(Etype
(Id
))
1483 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
1484 or else (Present
(Next_Formal
(First_Formal
(Id
)))
1487 (Etype
(Next_Formal
(First_Formal
(Id
))))));
1489 Set_Is_Potentially_Use_Visible
(Id
,
1490 In_Use
(P
) and not Is_Hidden
(Id
));
1493 -- Local entities are not immediately visible outside of the package.
1495 Set_Is_Immediately_Visible
(Id
, False);
1497 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
1498 Check_Abstract_Overriding
(Id
);
1501 if (Ekind
(Id
) = E_Private_Type
1502 or else Ekind
(Id
) = E_Limited_Private_Type
)
1503 and then No
(Full_View
(Id
))
1504 and then not Is_Generic_Type
(Id
)
1505 and then not Is_Derived_Type
(Id
)
1507 Error_Msg_N
("missing full declaration for private type&", Id
);
1509 elsif Ekind
(Id
) = E_Record_Type_With_Private
1510 and then not Is_Generic_Type
(Id
)
1511 and then No
(Full_View
(Id
))
1513 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
1514 Error_Msg_N
("missing full declaration for private type&", Id
);
1517 ("missing full declaration for private extension", Id
);
1520 elsif Ekind
(Id
) = E_Constant
1521 and then No
(Constant_Value
(Id
))
1522 and then No
(Full_View
(Id
))
1523 and then not Is_Imported
(Id
)
1524 and then (Nkind
(Parent
(Id
)) /= N_Object_Declaration
1525 or else not No_Initialization
(Parent
(Id
)))
1527 Error_Msg_N
("missing full declaration for deferred constant", Id
);
1533 -- If the specification was installed as the parent of a public child
1534 -- unit, the private declarations were not installed, and there is
1537 if not In_Private_Part
(P
) then
1540 Set_In_Private_Part
(P
, False);
1543 -- Make private entities invisible and exchange full and private
1544 -- declarations for private types.
1546 while Present
(Id
) loop
1547 if Debug_Flag_E
then
1548 Write_Str
("unlinking private entity ");
1549 Write_Int
(Int
(Id
));
1553 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
1554 Check_Abstract_Overriding
(Id
);
1557 Set_Is_Immediately_Visible
(Id
, False);
1559 if Is_Private_Base_Type
(Id
)
1560 and then Present
(Full_View
(Id
))
1562 Full
:= Full_View
(Id
);
1564 -- If the partial view is not declared in the visible part
1565 -- of the package (as is the case when it is a type derived
1566 -- from some other private type in the private part if the
1567 -- current package), no exchange takes place.
1570 or else List_Containing
(Parent
(Id
))
1571 /= Visible_Declarations
(Specification
(Decl
))
1576 -- The entry in the private part points to the full declaration,
1577 -- which is currently visible. Exchange them so only the private
1578 -- type declaration remains accessible, and link private and
1579 -- full declaration in the opposite direction. Before the actual
1580 -- exchange, we copy back attributes of the full view that
1581 -- must be available to the partial view too.
1583 Preserve_Full_Attributes
(Id
, Full
);
1585 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
1587 if Is_Indefinite_Subtype
(Full
)
1588 and then not Is_Indefinite_Subtype
(Id
)
1591 ("full view of type must be definite subtype", Full
);
1594 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1595 Exchange_Declarations
(Id
);
1597 -- Swap out the subtypes and derived types of Id that were
1598 -- compiled in this scope, or installed previously by
1599 -- Install_Private_Declarations.
1600 -- Before we do the swap, we verify the presence of the
1601 -- Full_View field which may be empty due to a swap by
1602 -- a previous call to End_Package_Scope (e.g. from the
1603 -- freezing mechanism).
1605 while Present
(Priv_Elmt
) loop
1606 Priv_Sub
:= Node
(Priv_Elmt
);
1608 if Present
(Full_View
(Priv_Sub
)) then
1610 if Scope
(Priv_Sub
) = P
1611 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
1613 Set_Is_Immediately_Visible
(Priv_Sub
, False);
1616 if Is_Visible_Dependent
(Priv_Sub
) then
1617 Preserve_Full_Attributes
1618 (Priv_Sub
, Full_View
(Priv_Sub
));
1619 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
1620 Exchange_Declarations
(Priv_Sub
);
1624 Next_Elmt
(Priv_Elmt
);
1627 elsif Ekind
(Id
) = E_Incomplete_Type
1628 and then No
(Full_View
(Id
))
1630 -- Mark Taft amendment types
1632 Set_Has_Completion_In_Body
(Id
);
1634 elsif not Is_Child_Unit
(Id
)
1635 and then (not Is_Private_Type
(Id
)
1636 or else No
(Full_View
(Id
)))
1639 Set_Is_Potentially_Use_Visible
(Id
, False);
1646 end Uninstall_Declarations
;
1648 ------------------------
1649 -- Unit_Requires_Body --
1650 ------------------------
1652 function Unit_Requires_Body
(P
: Entity_Id
) return Boolean is
1656 -- Imported entity never requires body. Right now, only
1657 -- subprograms can be imported, but perhaps in the future
1658 -- we will allow import of packages.
1660 if Is_Imported
(P
) then
1663 -- Body required if library package with pragma Elaborate_Body
1665 elsif Has_Pragma_Elaborate_Body
(P
) then
1668 -- Body required if subprogram
1670 elsif (Is_Subprogram
(P
)
1672 Ekind
(P
) = E_Generic_Function
1674 Ekind
(P
) = E_Generic_Procedure
)
1678 -- Treat a block as requiring a body
1680 elsif Ekind
(P
) = E_Block
then
1683 elsif Ekind
(P
) = E_Package
1684 and then Nkind
(Parent
(P
)) = N_Package_Specification
1685 and then Present
(Generic_Parent
(Parent
(P
)))
1688 G_P
: Entity_Id
:= Generic_Parent
(Parent
(P
));
1691 if Has_Pragma_Elaborate_Body
(G_P
) then
1697 -- Otherwise search entity chain for entity requiring completion.
1699 E
:= First_Entity
(P
);
1700 while Present
(E
) loop
1702 -- Always ignore child units. Child units get added to the entity
1703 -- list of a parent unit, but are not original entities of the
1704 -- parent, and so do not affect whether the parent needs a body.
1706 if Is_Child_Unit
(E
) then
1709 -- Otherwise test to see if entity requires a completion
1711 elsif (Is_Overloadable
(E
)
1712 and then Ekind
(E
) /= E_Enumeration_Literal
1713 and then Ekind
(E
) /= E_Operator
1714 and then not Is_Abstract
(E
)
1715 and then not Has_Completion
(E
))
1718 (Ekind
(E
) = E_Package
1720 and then not Has_Completion
(E
)
1721 and then Unit_Requires_Body
(E
))
1724 (Ekind
(E
) = E_Incomplete_Type
and then No
(Full_View
(E
)))
1727 ((Ekind
(E
) = E_Task_Type
or else
1728 Ekind
(E
) = E_Protected_Type
)
1729 and then not Has_Completion
(E
))
1732 (Ekind
(E
) = E_Generic_Package
and then E
/= P
1733 and then not Has_Completion
(E
)
1734 and then Unit_Requires_Body
(E
))
1737 (Ekind
(E
) = E_Generic_Function
1738 and then not Has_Completion
(E
))
1741 (Ekind
(E
) = E_Generic_Procedure
1742 and then not Has_Completion
(E
))
1747 -- Entity that does not require completion
1757 end Unit_Requires_Body
;