1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2006, 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, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, 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_Ch10
; use Sem_Ch10
;
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_Package_Entity
(Id
: Entity_Id
);
90 -- Basic procedure for the previous two. Places one entity on its
91 -- visibility chain, and recurses on the visible part if the entity
92 -- is an inner package.
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 Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
104 -- Called upon entering the private part of a public child package
105 -- and the body of a nested package, to potentially declare certain
106 -- inherited subprograms that were inherited by types in the visible
107 -- part, but whose declaration was deferred because the parent
108 -- operation was private and not visible at that point. These
109 -- subprograms are located by traversing the visible part declarations
110 -- looking for non-private type extensions and then examining each of
111 -- the primitive operations of such types to find those that were
112 -- inherited but declared with a special internal name. Each such
113 -- operation is now declared as an operation with a normal name (using
114 -- the name of the parent operation) and replaces the previous implicit
115 -- operation in the primitive operations list of the type. If the
116 -- inherited private operation has been overridden, then it's
117 -- replaced by the overriding operation.
119 --------------------------
120 -- Analyze_Package_Body --
121 --------------------------
123 procedure Analyze_Package_Body
(N
: Node_Id
) is
124 Loc
: constant Source_Ptr
:= Sloc
(N
);
128 Last_Spec_Entity
: Entity_Id
;
132 procedure Install_Composite_Operations
(P
: Entity_Id
);
133 -- Composite types declared in the current scope may depend on
134 -- types that were private at the point of declaration, and whose
135 -- full view is now in scope. Indicate that the corresponding
136 -- operations on the composite type are available.
138 ----------------------------------
139 -- Install_Composite_Operations --
140 ----------------------------------
142 procedure Install_Composite_Operations
(P
: Entity_Id
) is
146 Id
:= First_Entity
(P
);
148 while Present
(Id
) loop
151 and then (Is_Limited_Composite
(Id
)
152 or else Is_Private_Composite
(Id
))
153 and then No
(Private_Component
(Id
))
155 Set_Is_Limited_Composite
(Id
, False);
156 Set_Is_Private_Composite
(Id
, False);
161 end Install_Composite_Operations
;
163 -- Start of processing for Analyze_Package_Body
166 -- Find corresponding package specification, and establish the
167 -- current scope. The visible defining entity for the package is the
168 -- defining occurrence in the spec. On exit from the package body, all
169 -- body declarations are attached to the defining entity for the body,
170 -- but the later is never used for name resolution. In this fashion
171 -- there is only one visible entity that denotes the package.
174 Write_Str
("==== Compiling package body ");
175 Write_Name
(Chars
(Defining_Entity
(N
)));
176 Write_Str
(" from ");
177 Write_Location
(Loc
);
181 -- Set Body_Id. Note that this Will be reset to point to the
182 -- generic copy later on in the generic case.
184 Body_Id
:= Defining_Entity
(N
);
186 if Present
(Corresponding_Spec
(N
)) then
188 -- Body is body of package instantiation. Corresponding spec
189 -- has already been set.
191 Spec_Id
:= Corresponding_Spec
(N
);
192 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
195 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
198 and then Is_Package_Or_Generic_Package
(Spec_Id
)
200 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
202 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
203 Error_Msg_N
("cannot supply body for package renaming", N
);
206 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
207 Error_Msg_N
("redefinition of package body", N
);
212 Error_Msg_N
("missing specification for package body", N
);
216 if Is_Package_Or_Generic_Package
(Spec_Id
)
218 (Scope
(Spec_Id
) = Standard_Standard
219 or else Is_Child_Unit
(Spec_Id
))
220 and then not Unit_Requires_Body
(Spec_Id
)
222 if Ada_Version
= Ada_83
then
224 ("optional package body (not allowed in Ada 95)?", N
);
227 ("spec of this package does not allow a body", N
);
232 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
233 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
235 if Is_Child_Unit
(Spec_Id
) then
236 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
238 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
241 Set_Is_Child_Unit
(Body_Id
);
244 -- Generic package case
246 if Ekind
(Spec_Id
) = E_Generic_Package
then
248 -- Disable expansion and perform semantic analysis on copy.
249 -- The unannotated body will be used in all instantiations.
251 Body_Id
:= Defining_Entity
(N
);
252 Set_Ekind
(Body_Id
, E_Package_Body
);
253 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
254 Set_Body_Entity
(Spec_Id
, Body_Id
);
255 Set_Spec_Entity
(Body_Id
, Spec_Id
);
257 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
260 -- Update Body_Id to point to the copied node for the remainder
261 -- of the processing.
263 Body_Id
:= Defining_Entity
(N
);
267 -- The Body_Id is that of the copied node in the generic case, the
268 -- current node otherwise. Note that N was rewritten above, so we
269 -- must be sure to get the latest Body_Id value.
271 Set_Ekind
(Body_Id
, E_Package_Body
);
272 Set_Body_Entity
(Spec_Id
, Body_Id
);
273 Set_Spec_Entity
(Body_Id
, Spec_Id
);
275 -- Defining name for the package body is not a visible entity: Only
276 -- the defining name for the declaration is visible.
278 Set_Etype
(Body_Id
, Standard_Void_Type
);
279 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
280 Set_Corresponding_Spec
(N
, Spec_Id
);
281 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
283 -- The body entity is not used for semantics or code generation, but
284 -- it is attached to the entity list of the enclosing scope to simplify
285 -- the listing of back-annotations for the types it main contain.
287 if Scope
(Spec_Id
) /= Standard_Standard
then
288 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
291 -- Indicate that we are currently compiling the body of the package
293 Set_In_Package_Body
(Spec_Id
);
294 Set_Has_Completion
(Spec_Id
);
295 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
299 Set_Categorization_From_Pragmas
(N
);
301 Install_Visible_Declarations
(Spec_Id
);
302 Install_Private_Declarations
(Spec_Id
);
303 Install_Private_With_Clauses
(Spec_Id
);
304 Install_Composite_Operations
(Spec_Id
);
306 if Ekind
(Spec_Id
) = E_Generic_Package
then
307 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
310 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
311 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
313 -- This is a nested package, so it may be necessary to declare
314 -- certain inherited subprograms that are not yet visible because
315 -- the parent type's subprograms are now visible.
317 if Ekind
(Scope
(Spec_Id
)) = E_Package
318 and then Scope
(Spec_Id
) /= Standard_Standard
320 Declare_Inherited_Private_Subprograms
(Spec_Id
);
323 if Present
(Declarations
(N
)) then
324 Analyze_Declarations
(Declarations
(N
));
327 HSS
:= Handled_Statement_Sequence
(N
);
329 if Present
(HSS
) then
330 Process_End_Label
(HSS
, 't', Spec_Id
);
333 -- Check that elaboration code in a preelaborable package body is
334 -- empty other than null statements and labels (RM 10.2.1(6)).
336 Validate_Null_Statement_Sequence
(N
);
339 Validate_Categorization_Dependency
(N
, Spec_Id
);
340 Check_Completion
(Body_Id
);
342 -- Generate start of body reference. Note that we do this fairly late,
343 -- because the call will use In_Extended_Main_Source_Unit as a check,
344 -- and we want to make sure that Corresponding_Stub links are set
346 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
348 -- For a generic package, collect global references and mark
349 -- them on the original body so that they are not resolved
350 -- again at the point of instantiation.
352 if Ekind
(Spec_Id
) /= E_Package
then
353 Save_Global_References
(Original_Node
(N
));
357 -- The entities of the package body have so far been chained onto
358 -- the declaration chain for the spec. That's been fine while we
359 -- were in the body, since we wanted them to be visible, but now
360 -- that we are leaving the package body, they are no longer visible,
361 -- so we remove them from the entity chain of the package spec entity,
362 -- and copy them to the entity chain of the package body entity, where
363 -- they will never again be visible.
365 if Present
(Last_Spec_Entity
) then
366 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
367 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
368 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
369 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
372 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
373 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
374 Set_First_Entity
(Spec_Id
, Empty
);
375 Set_Last_Entity
(Spec_Id
, Empty
);
378 End_Package_Scope
(Spec_Id
);
380 -- All entities declared in body are not visible
386 E
:= First_Entity
(Body_Id
);
388 while Present
(E
) loop
389 Set_Is_Immediately_Visible
(E
, False);
390 Set_Is_Potentially_Use_Visible
(E
, False);
393 -- Child units may appear on the entity list (for example if
394 -- they appear in the context of a subunit) but they are not
397 if not Is_Child_Unit
(E
) then
398 Set_Is_Package_Body_Entity
(E
);
405 Check_References
(Body_Id
);
407 -- For a generic unit, check that the formal parameters are referenced,
408 -- and that local variables are used, as for regular packages.
410 if Ekind
(Spec_Id
) = E_Generic_Package
then
411 Check_References
(Spec_Id
);
414 -- The processing so far has made all entities of the package body
415 -- public (i.e. externally visible to the linker). This is in general
416 -- necessary, since inlined or generic bodies, for which code is
417 -- generated in other units, may need to see these entities. The
418 -- following loop runs backwards from the end of the entities of the
419 -- package body making these entities invisible until we reach a
420 -- referencer, i.e. a declaration that could reference a previous
421 -- declaration, a generic body or an inlined body, or a stub (which
422 -- may contain either of these). This is of course an approximation,
423 -- but it is conservative and definitely correct.
425 -- We only do this at the outer (library) level non-generic packages.
426 -- The reason is simply to cut down on the number of external symbols
427 -- generated, so this is simply an optimization of the efficiency
428 -- of the compilation process. It has no other effect.
430 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
431 and then not Is_Generic_Unit
(Spec_Id
)
432 and then Present
(Declarations
(N
))
434 Make_Non_Public_Where_Possible
: declare
436 function Has_Referencer
440 -- Traverse the given list of declarations in reverse order.
441 -- Return True as soon as a referencer is reached. Return
442 -- False if none is found. The Outer parameter is True for
443 -- the outer level call, and False for inner level calls for
444 -- nested packages. If Outer is True, then any entities up
445 -- to the point of hitting a referencer get their Is_Public
446 -- flag cleared, so that the entities will be treated as
447 -- static entities in the C sense, and need not have fully
448 -- qualified names. For inner levels, we need all names to
449 -- be fully qualified to deal with the same name appearing
450 -- in parallel packages (right now this is tied to their
457 function Has_Referencer
474 while Present
(D
) loop
477 if K
in N_Body_Stub
then
480 elsif K
= N_Subprogram_Body
then
481 if Acts_As_Spec
(D
) then
482 E
:= Defining_Entity
(D
);
484 -- An inlined body acts as a referencer. Note also
485 -- that we never reset Is_Public for an inlined
486 -- subprogram. Gigi requires Is_Public to be set.
488 -- Note that we test Has_Pragma_Inline here rather
489 -- than Is_Inlined. We are compiling this for a
490 -- client, and it is the client who will decide
491 -- if actual inlining should occur, so we need to
492 -- assume that the procedure could be inlined for
493 -- the purpose of accessing global entities.
495 if Has_Pragma_Inline
(E
) then
498 Set_Is_Public
(E
, False);
502 E
:= Corresponding_Spec
(D
);
505 and then (Is_Generic_Unit
(E
)
506 or else Has_Pragma_Inline
(E
)
507 or else Is_Inlined
(E
))
513 -- Processing for package bodies
515 elsif K
= N_Package_Body
516 and then Present
(Corresponding_Spec
(D
))
518 E
:= Corresponding_Spec
(D
);
520 -- Generic package body is a referencer. It would
521 -- seem that we only have to consider generics that
522 -- can be exported, i.e. where the corresponding spec
523 -- is the spec of the current package, but because of
524 -- nested instantiations, a fully private generic
525 -- body may export other private body entities.
527 if Is_Generic_Unit
(E
) then
530 -- For non-generic package body, recurse into body
531 -- unless this is an instance, we ignore instances
532 -- since they cannot have references that affect
535 elsif not Is_Generic_Instance
(E
) then
537 (Declarations
(D
), Outer
=> False)
543 -- Processing for package specs, recurse into declarations.
544 -- Again we skip this for the case of generic instances.
546 elsif K
= N_Package_Declaration
then
547 S
:= Specification
(D
);
549 if not Is_Generic_Unit
(Defining_Entity
(S
)) then
551 (Private_Declarations
(S
), Outer
=> False)
555 (Visible_Declarations
(S
), Outer
=> False)
561 -- Objects and exceptions need not be public if we have
562 -- not encountered a referencer so far. We only reset
563 -- the flag for outer level entities that are not
564 -- imported/exported, and which have no interface name.
566 elsif K
= N_Object_Declaration
567 or else K
= N_Exception_Declaration
568 or else K
= N_Subprogram_Declaration
570 E
:= Defining_Entity
(D
);
573 and then not Is_Imported
(E
)
574 and then not Is_Exported
(E
)
575 and then No
(Interface_Name
(E
))
577 Set_Is_Public
(E
, False);
587 -- Start of processing for Make_Non_Public_Where_Possible
592 pragma Warnings
(Off
, Discard
);
595 Discard
:= Has_Referencer
(Declarations
(N
), Outer
=> True);
597 end Make_Non_Public_Where_Possible
;
600 -- If expander is not active, then here is where we turn off the
601 -- In_Package_Body flag, otherwise it is turned off at the end of
602 -- the corresponding expansion routine. If this is an instance body,
603 -- we need to qualify names of local entities, because the body may
604 -- have been compiled as a preliminary to another instantiation.
606 if not Expander_Active
then
607 Set_In_Package_Body
(Spec_Id
, False);
609 if Is_Generic_Instance
(Spec_Id
)
610 and then Operating_Mode
= Generate_Code
612 Qualify_Entity_Names
(N
);
615 end Analyze_Package_Body
;
617 ---------------------------------
618 -- Analyze_Package_Declaration --
619 ---------------------------------
621 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
622 Id
: constant Node_Id
:= Defining_Entity
(N
);
626 -- Ada 2005 (AI-217): Check if the package has been erroneously named
627 -- in a limited-with clause of its own context. In this case the error
628 -- has been previously notified by Analyze_Context.
630 -- limited with Pkg; -- ERROR
631 -- package Pkg is ...
633 if From_With_Type
(Id
) then
637 Generate_Definition
(Id
);
639 Set_Ekind
(Id
, E_Package
);
640 Set_Etype
(Id
, Standard_Void_Type
);
644 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
645 Set_Is_Pure
(Id
, PF
);
647 Set_Categorization_From_Pragmas
(N
);
650 Write_Str
("==== Compiling package spec ");
651 Write_Name
(Chars
(Id
));
652 Write_Str
(" from ");
653 Write_Location
(Sloc
(N
));
657 Analyze
(Specification
(N
));
658 Validate_Categorization_Dependency
(N
, Id
);
659 End_Package_Scope
(Id
);
661 -- For a compilation unit, indicate whether it needs a body, and
662 -- whether elaboration warnings may be meaningful on it.
664 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
665 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
667 if not Body_Required
(Parent
(N
)) then
668 Set_Suppress_Elaboration_Warnings
(Id
);
671 Validate_RT_RAT_Component
(N
);
673 end Analyze_Package_Declaration
;
675 -----------------------------------
676 -- Analyze_Package_Specification --
677 -----------------------------------
679 -- Note that this code is shared for the analysis of generic package
680 -- specs (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
682 procedure Analyze_Package_Specification
(N
: Node_Id
) is
683 Id
: constant Entity_Id
:= Defining_Entity
(N
);
684 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
685 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
686 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
689 Public_Child
: Boolean;
691 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
692 -- Clears constant indications (Never_Set_In_Source, Constant_Value,
693 -- and Is_True_Constant) on all variables that are entities of Id,
694 -- and on the chain whose first element is FE. A recursive call is
695 -- made for all packages and generic packages.
697 procedure Generate_Parent_References
;
698 -- For a child unit, generate references to parent units, for
699 -- GPS navigation purposes.
701 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
702 -- Child and Unit are entities of compilation units. True if Child
703 -- is a public child of Parent as defined in 10.1.1
705 procedure Inspect_Deferred_Constant_Completion
;
706 -- Examines the deferred constants in the private part of the package
707 -- specification. Emits the error message "constant declaration requires
708 -- initialization expression " if not completed by an Import pragma.
710 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
711 -- Detects all incomplete or private type declarations having a known
712 -- discriminant part that are completed by an Unchecked_Union. Emits
713 -- the error message "Unchecked_Union may not complete discriminated
716 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
717 -- Given the package entity of a generic package instantiation or
718 -- formal package whose corresponding generic is a child unit, installs
719 -- the private declarations of each of the child unit's parents.
720 -- This has to be done at the point of entering the instance package's
721 -- private part rather than being done in Sem_Ch12.Install_Parent
722 -- (which is where the parents' visible declarations are installed).
724 ---------------------
725 -- Clear_Constants --
726 ---------------------
728 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
732 -- Ignore package renamings, not interesting and they can
733 -- cause self referential loops in the code below.
735 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
739 -- Note: in the loop below, the check for Next_Entity pointing
740 -- back to the package entity seems very odd, but it is needed,
741 -- because this kind of unexpected circularity does occur ???
744 while Present
(E
) and then E
/= Id
loop
745 if Ekind
(E
) = E_Variable
then
746 Set_Never_Set_In_Source
(E
, False);
747 Set_Is_True_Constant
(E
, False);
748 Set_Current_Value
(E
, Empty
);
749 Set_Is_Known_Null
(E
, False);
751 if not Can_Never_Be_Null
(E
) then
752 Set_Is_Known_Non_Null
(E
, False);
755 elsif Ekind
(E
) = E_Package
757 Ekind
(E
) = E_Generic_Package
759 Clear_Constants
(E
, First_Entity
(E
));
760 Clear_Constants
(E
, First_Private_Entity
(E
));
767 --------------------------------
768 -- Generate_Parent_References --
769 --------------------------------
771 procedure Generate_Parent_References
is
772 Decl
: constant Node_Id
:= Parent
(N
);
775 if Id
= Cunit_Entity
(Main_Unit
)
776 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
778 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
780 elsif Nkind
(Unit
(Cunit
(Main_Unit
))) /= N_Subprogram_Body
781 and then Nkind
(Unit
(Cunit
(Main_Unit
))) /= N_Subunit
783 -- If current unit is an ancestor of main unit, generate
784 -- a reference to its own parent.
788 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
791 if Nkind
(Main_Spec
) = N_Package_Body
then
792 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
795 U
:= Parent_Spec
(Main_Spec
);
796 while Present
(U
) loop
797 if U
= Parent
(Decl
) then
798 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
801 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
805 U
:= Parent_Spec
(Unit
(U
));
810 end Generate_Parent_References
;
812 ---------------------
813 -- Is_Public_Child --
814 ---------------------
816 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
818 if not Is_Private_Descendant
(Child
) then
822 return not Private_Present
(
823 Parent
(Unit_Declaration_Node
(Child
)));
825 return Is_Public_Child
(Scope
(Child
), Unit
);
830 ------------------------------------------
831 -- Inspect_Deferred_Constant_Completion --
832 ------------------------------------------
834 procedure Inspect_Deferred_Constant_Completion
is
838 Decl
:= First
(Priv_Decls
);
839 while Present
(Decl
) loop
841 -- Deferred constant signature
843 if Nkind
(Decl
) = N_Object_Declaration
844 and then Constant_Present
(Decl
)
845 and then No
(Expression
(Decl
))
847 -- No need to check internally generated constants
849 and then Comes_From_Source
(Decl
)
851 -- The constant is not completed. A full object declaration
852 -- or a pragma Import complete a deferred constant.
854 and then not Has_Completion
(Defining_Identifier
(Decl
))
857 ("constant declaration requires initialization expression",
858 Defining_Identifier
(Decl
));
863 end Inspect_Deferred_Constant_Completion
;
865 ----------------------------------------
866 -- Inspect_Unchecked_Union_Completion --
867 ----------------------------------------
869 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
870 Decl
: Node_Id
:= First
(Decls
);
873 while Present
(Decl
) loop
875 -- We are looking at an incomplete or private type declaration
876 -- with a known_discriminant_part whose full view is an
879 if (Nkind
(Decl
) = N_Incomplete_Type_Declaration
881 Nkind
(Decl
) = N_Private_Type_Declaration
)
882 and then Has_Discriminants
(Defining_Identifier
(Decl
))
883 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
884 and then Is_Unchecked_Union
885 (Full_View
(Defining_Identifier
(Decl
)))
887 Error_Msg_N
("completion of discriminated partial view" &
888 " cannot be an Unchecked_Union",
889 Full_View
(Defining_Identifier
(Decl
)));
894 end Inspect_Unchecked_Union_Completion
;
896 -----------------------------------------
897 -- Install_Parent_Private_Declarations --
898 -----------------------------------------
900 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
901 Inst_Par
: Entity_Id
:= Inst_Id
;
907 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
908 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
909 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
911 if (Nkind
(Inst_Node
) = N_Package_Instantiation
912 or else Nkind
(Inst_Node
) = N_Formal_Package_Declaration
)
913 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
915 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
917 if Present
(Renamed_Entity
(Inst_Par
)) then
918 Inst_Par
:= Renamed_Entity
(Inst_Par
);
923 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
925 -- Install the private declarations and private use clauses
926 -- of a parent instance of the child instance.
928 if Present
(Gen_Par
) then
929 Install_Private_Declarations
(Inst_Par
);
930 Set_Use
(Private_Declarations
932 (Unit_Declaration_Node
(Inst_Par
))));
934 -- If we've reached the end of the generic instance parents,
935 -- then finish off by looping through the nongeneric parents
936 -- and installing their private declarations.
939 while Present
(Inst_Par
)
940 and then Inst_Par
/= Standard_Standard
941 and then (not In_Open_Scopes
(Inst_Par
)
942 or else not In_Private_Part
(Inst_Par
))
944 Install_Private_Declarations
(Inst_Par
);
945 Set_Use
(Private_Declarations
947 (Unit_Declaration_Node
(Inst_Par
))));
948 Inst_Par
:= Scope
(Inst_Par
);
958 end Install_Parent_Private_Declarations
;
960 -- Start of processing for Analyze_Package_Specification
963 if Present
(Vis_Decls
) then
964 Analyze_Declarations
(Vis_Decls
);
967 -- Verify that incomplete types have received full declarations
969 E
:= First_Entity
(Id
);
970 while Present
(E
) loop
971 if Ekind
(E
) = E_Incomplete_Type
972 and then No
(Full_View
(E
))
974 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
980 if Is_Remote_Call_Interface
(Id
)
981 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
983 Validate_RCI_Declarations
(Id
);
986 -- Save global references in the visible declarations, before
987 -- installing private declarations of parent unit if there is one,
988 -- because the privacy status of types defined in the parent will
989 -- change. This is only relevant for generic child units, but is
990 -- done in all cases for uniformity.
992 if Ekind
(Id
) = E_Generic_Package
993 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
996 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
997 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1000 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1001 Save_Global_References
(Orig_Decl
);
1002 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1006 -- If package is a public child unit, then make the private
1007 -- declarations of the parent visible.
1009 Public_Child
:= False;
1013 Pack_Decl
: Node_Id
;
1018 Par_Spec
:= Parent_Spec
(Parent
(N
));
1020 -- If the package is formal package of an enclosing generic, is is
1021 -- transformed into a local generic declaration, and compiled to make
1022 -- its spec available. We need to retrieve the original generic to
1023 -- determine whether it is a child unit, and install its parents.
1027 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1029 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1030 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1033 if Present
(Par_Spec
) then
1034 Generate_Parent_References
;
1036 while Scope
(Par
) /= Standard_Standard
1037 and then Is_Public_Child
(Id
, Par
)
1039 Public_Child
:= True;
1041 Install_Private_Declarations
(Par
);
1042 Install_Private_With_Clauses
(Par
);
1043 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1044 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1049 if Is_Compilation_Unit
(Id
) then
1050 Install_Private_With_Clauses
(Id
);
1053 -- If this is a package associated with a generic instance or formal
1054 -- package, then the private declarations of each of the generic's
1055 -- parents must be installed at this point.
1057 if Is_Generic_Instance
(Id
)
1059 (Nkind
(Unit_Declaration_Node
(Id
)) = N_Generic_Package_Declaration
1061 Nkind
(Original_Node
(Unit_Declaration_Node
(Id
)))
1062 = N_Formal_Package_Declaration
)
1064 Install_Parent_Private_Declarations
(Id
);
1067 -- Analyze private part if present. The flag In_Private_Part is
1068 -- reset in End_Package_Scope.
1070 L
:= Last_Entity
(Id
);
1072 if Present
(Priv_Decls
) then
1073 Set_In_Private_Part
(Id
);
1075 -- Upon entering a public child's private part, it may be
1076 -- necessary to declare subprograms that were derived in
1077 -- the package visible part but not yet made visible.
1079 if Public_Child
then
1080 Declare_Inherited_Private_Subprograms
(Id
);
1083 Analyze_Declarations
(Priv_Decls
);
1085 -- Check the private declarations for incomplete deferred constants
1087 Inspect_Deferred_Constant_Completion
;
1089 -- The first private entity is the immediate follower of the last
1090 -- visible entity, if there was one.
1093 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1095 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
1098 -- There may be inherited private subprograms that need to be
1099 -- declared, even in the absence of an explicit private part.
1100 -- If there are any public declarations in the package and
1101 -- the package is a public child unit, then an implicit private
1104 elsif Present
(L
) and then Public_Child
then
1105 Set_In_Private_Part
(Id
);
1106 Declare_Inherited_Private_Subprograms
(Id
);
1107 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1110 -- Check rule of 3.6(11), which in general requires
1111 -- waiting till all full types have been seen.
1113 E
:= First_Entity
(Id
);
1114 while Present
(E
) loop
1115 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1116 Check_Aliased_Component_Types
(E
);
1122 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1123 -- declaration having a known_discriminant_part shall not be an
1124 -- Unchecked_Union type.
1126 if Present
(Vis_Decls
) then
1127 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1130 if Present
(Priv_Decls
) then
1131 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1134 if Ekind
(Id
) = E_Generic_Package
1135 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1136 and then Present
(Priv_Decls
)
1138 -- Save global references in private declarations, ignoring the
1139 -- visible declarations that were processed earlier.
1142 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1143 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1144 Save_Form
: constant List_Id
:=
1145 Generic_Formal_Declarations
(Orig_Decl
);
1148 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1149 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1150 Save_Global_References
(Orig_Decl
);
1151 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1152 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1156 Process_End_Label
(N
, 'e', Id
);
1158 -- For the case of a library level package, we must go through all
1159 -- the entities clearing the indications that the value may be
1160 -- constant and not modified. Why? Because any client of this
1161 -- package may modify these values freely from anywhere. This
1162 -- also applies to any nested packages or generic packages.
1164 -- For now we unconditionally clear constants for packages that
1165 -- are instances of generic packages. The reason is that we do not
1166 -- have the body yet, and we otherwise think things are unreferenced
1167 -- when they are not. This should be fixed sometime (the effect is
1168 -- not terrible, we just lose some warnings, and also some cases
1169 -- of value propagation) ???
1171 if Is_Library_Level_Entity
(Id
)
1172 or else Is_Generic_Instance
(Id
)
1174 Clear_Constants
(Id
, First_Entity
(Id
));
1175 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1177 end Analyze_Package_Specification
;
1179 --------------------------------------
1180 -- Analyze_Private_Type_Declaration --
1181 --------------------------------------
1183 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1184 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1185 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1188 Generate_Definition
(Id
);
1189 Set_Is_Pure
(Id
, PF
);
1190 Init_Size_Align
(Id
);
1192 if (Ekind
(Current_Scope
) /= E_Package
1193 and then Ekind
(Current_Scope
) /= E_Generic_Package
)
1194 or else In_Private_Part
(Current_Scope
)
1196 Error_Msg_N
("invalid context for private declaration", N
);
1199 New_Private_Type
(N
, Id
, N
);
1200 Set_Depends_On_Private
(Id
);
1201 end Analyze_Private_Type_Declaration
;
1203 -------------------------------------------
1204 -- Declare_Inherited_Private_Subprograms --
1205 -------------------------------------------
1207 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1211 Op_Elmt_2
: Elmt_Id
;
1212 Prim_Op
: Entity_Id
;
1213 New_Op
: Entity_Id
:= Empty
;
1214 Parent_Subp
: Entity_Id
;
1215 Found_Explicit
: Boolean;
1216 Decl_Privates
: Boolean;
1218 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1219 -- Check whether an inherited subprogram is an operation of an
1220 -- untagged derived type.
1222 ---------------------
1223 -- Is_Primitive_Of --
1224 ---------------------
1226 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1230 if Etype
(S
) = T
then
1234 Formal
:= First_Formal
(S
);
1236 while Present
(Formal
) loop
1237 if Etype
(Formal
) = T
then
1241 Next_Formal
(Formal
);
1246 end Is_Primitive_Of
;
1248 -- Start of processing for Declare_Inherited_Private_Subprograms
1251 E
:= First_Entity
(Id
);
1252 while Present
(E
) loop
1254 -- If the entity is a nonprivate type extension whose parent
1255 -- type is declared in an open scope, then the type may have
1256 -- inherited operations that now need to be made visible.
1257 -- Ditto if the entity is a formal derived type in a child unit.
1259 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1261 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1262 and then Is_Generic_Type
(E
)))
1263 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1264 and then E
= Base_Type
(E
)
1266 if Is_Tagged_Type
(E
) then
1267 Op_List
:= Primitive_Operations
(E
);
1269 Decl_Privates
:= False;
1271 Op_Elmt
:= First_Elmt
(Op_List
);
1272 while Present
(Op_Elmt
) loop
1273 Prim_Op
:= Node
(Op_Elmt
);
1275 -- If the primitive operation is an implicit operation
1276 -- with an internal name whose parent operation has
1277 -- a normal name, then we now need to either declare the
1278 -- operation (i.e., make it visible), or replace it
1279 -- by an overriding operation if one exists.
1281 if Present
(Alias
(Prim_Op
))
1282 and then not Comes_From_Source
(Prim_Op
)
1283 and then Is_Internal_Name
(Chars
(Prim_Op
))
1284 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1286 Parent_Subp
:= Alias
(Prim_Op
);
1288 Found_Explicit
:= False;
1289 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1290 while Present
(Op_Elmt_2
) loop
1291 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
1292 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
1294 -- The private inherited operation has been
1295 -- overridden by an explicit subprogram, so
1296 -- change the private op's list element to
1297 -- designate the explicit so the explicit
1298 -- one will get the right dispatching slot.
1300 New_Op
:= Node
(Op_Elmt_2
);
1301 Replace_Elmt
(Op_Elmt
, New_Op
);
1302 Remove_Elmt
(Op_List
, Op_Elmt_2
);
1303 Found_Explicit
:= True;
1304 Set_Is_Overriding_Operation
(New_Op
);
1305 Decl_Privates
:= True;
1310 Next_Elmt
(Op_Elmt_2
);
1313 if not Found_Explicit
then
1315 (New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1318 (Is_Dispatching_Operation
(New_Op
)
1319 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
1321 -- Substitute the new operation for the old one
1322 -- in the type's primitive operations list. Since
1323 -- the new operation was also just added to the end
1324 -- of list, the last element must be removed.
1326 -- (Question: is there a simpler way of declaring
1327 -- the operation, say by just replacing the name
1328 -- of the earlier operation, reentering it in the
1329 -- in the symbol table (how?), and marking it as
1332 Replace_Elmt
(Op_Elmt
, New_Op
);
1333 Remove_Last_Elmt
(Op_List
);
1334 Decl_Privates
:= True;
1338 Next_Elmt
(Op_Elmt
);
1341 -- The type's DT attributes need to be recalculated
1342 -- in the case where private dispatching operations
1343 -- have been added or overridden. Normally this action
1344 -- occurs during type freezing, but we force it here
1345 -- since the type may already have been frozen (e.g.,
1346 -- if the type's package has an empty private part).
1347 -- This can only be done if expansion is active, otherwise
1348 -- Tag may not be present.
1351 and then Expander_Active
1353 Set_All_DT_Position
(E
);
1357 -- Non-tagged type, scan forward to locate
1358 -- inherited hidden operations.
1360 Prim_Op
:= Next_Entity
(E
);
1362 while Present
(Prim_Op
) loop
1363 if Is_Subprogram
(Prim_Op
)
1364 and then Present
(Alias
(Prim_Op
))
1365 and then not Comes_From_Source
(Prim_Op
)
1366 and then Is_Internal_Name
(Chars
(Prim_Op
))
1367 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1368 and then Is_Primitive_Of
(E
, Prim_Op
)
1370 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1373 Next_Entity
(Prim_Op
);
1380 end Declare_Inherited_Private_Subprograms
;
1382 -----------------------
1383 -- End_Package_Scope --
1384 -----------------------
1386 procedure End_Package_Scope
(P
: Entity_Id
) is
1388 Uninstall_Declarations
(P
);
1390 end End_Package_Scope
;
1392 ---------------------------
1393 -- Exchange_Declarations --
1394 ---------------------------
1396 procedure Exchange_Declarations
(Id
: Entity_Id
) is
1397 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
1398 H1
: constant Entity_Id
:= Homonym
(Id
);
1399 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
1404 -- If missing full declaration for type, nothing to exchange
1406 if No
(Full_Id
) then
1410 -- Otherwise complete the exchange, and preserve semantic links
1412 Next2
:= Next_Entity
(Full_Id
);
1413 H2
:= Homonym
(Full_Id
);
1415 -- Reset full declaration pointer to reflect the switched entities
1416 -- and readjust the next entity chains.
1418 Exchange_Entities
(Id
, Full_Id
);
1420 Set_Next_Entity
(Id
, Next1
);
1421 Set_Homonym
(Id
, H1
);
1423 Set_Full_View
(Full_Id
, Id
);
1424 Set_Next_Entity
(Full_Id
, Next2
);
1425 Set_Homonym
(Full_Id
, H2
);
1426 end Exchange_Declarations
;
1428 ----------------------------
1429 -- Install_Package_Entity --
1430 ----------------------------
1432 procedure Install_Package_Entity
(Id
: Entity_Id
) is
1434 if not Is_Internal
(Id
) then
1435 if Debug_Flag_E
then
1436 Write_Str
("Install: ");
1437 Write_Name
(Chars
(Id
));
1441 if not Is_Child_Unit
(Id
) then
1442 Set_Is_Immediately_Visible
(Id
);
1446 end Install_Package_Entity
;
1448 ----------------------------------
1449 -- Install_Private_Declarations --
1450 ----------------------------------
1452 procedure Install_Private_Declarations
(P
: Entity_Id
) is
1454 Priv_Elmt
: Elmt_Id
;
1459 -- First exchange declarations for private types, so that the
1460 -- full declaration is visible. For each private type, we check
1461 -- its Private_Dependents list and also exchange any subtypes of
1462 -- or derived types from it. Finally, if this is a Taft amendment
1463 -- type, the incomplete declaration is irrelevant, and we want to
1464 -- link the eventual full declaration with the original private
1465 -- one so we also skip the exchange.
1467 Id
:= First_Entity
(P
);
1468 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1470 if Is_Private_Base_Type
(Id
)
1471 and then Comes_From_Source
(Full_View
(Id
))
1472 and then Present
(Full_View
(Id
))
1473 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
1474 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
1476 -- If there is a use-type clause on the private type, set the
1477 -- full view accordingly.
1479 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
1480 Full
:= Full_View
(Id
);
1482 if Is_Private_Base_Type
(Full
)
1483 and then Has_Private_Declaration
(Full
)
1484 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
1485 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
1486 and then In_Package_Body
(Current_Scope
)
1487 and then not Is_Private_Type
(Etype
(Full
))
1489 -- This is the completion of a private type by a derivation
1490 -- from another private type which is not private anymore. This
1491 -- can only happen in a package nested within a child package,
1492 -- when the parent type is defined in the parent unit. At this
1493 -- point the current type is not private either, and we have to
1494 -- install the underlying full view, which is now visible.
1496 if No
(Full_View
(Full
))
1497 and then Present
(Underlying_Full_View
(Full
))
1499 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
1500 Set_Underlying_Full_View
(Full
, Empty
);
1501 Set_Is_Frozen
(Full_View
(Id
));
1505 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1507 Exchange_Declarations
(Id
);
1508 Set_Is_Immediately_Visible
(Id
);
1510 while Present
(Priv_Elmt
) loop
1511 Priv
:= Node
(Priv_Elmt
);
1513 -- Before the exchange, verify that the presence of the
1514 -- Full_View field. It will be empty if the entity
1515 -- has already been installed due to a previous call.
1517 if Present
(Full_View
(Priv
))
1518 and then Is_Visible_Dependent
(Priv
)
1521 -- For each subtype that is swapped, we also swap the
1522 -- reference to it in Private_Dependents, to allow access
1523 -- to it when we swap them out in End_Package_Scope.
1525 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
1526 Exchange_Declarations
(Priv
);
1527 Set_Is_Immediately_Visible
1528 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
1529 Set_Is_Potentially_Use_Visible
1530 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
1533 Next_Elmt
(Priv_Elmt
);
1540 -- Next make other declarations in the private part visible as well
1542 Id
:= First_Private_Entity
(P
);
1544 while Present
(Id
) loop
1545 Install_Package_Entity
(Id
);
1546 Set_Is_Hidden
(Id
, False);
1550 -- Indicate that the private part is currently visible, so it can be
1551 -- properly reset on exit.
1553 Set_In_Private_Part
(P
);
1554 end Install_Private_Declarations
;
1556 ----------------------------------
1557 -- Install_Visible_Declarations --
1558 ----------------------------------
1560 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
1562 Last_Entity
: Entity_Id
;
1566 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
1568 if Is_Package_Or_Generic_Package
(P
) then
1569 Last_Entity
:= First_Private_Entity
(P
);
1571 Last_Entity
:= Empty
;
1574 Id
:= First_Entity
(P
);
1576 while Present
(Id
) and then Id
/= Last_Entity
loop
1577 Install_Package_Entity
(Id
);
1580 end Install_Visible_Declarations
;
1582 --------------------------
1583 -- Is_Private_Base_Type --
1584 --------------------------
1586 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
1588 return Ekind
(E
) = E_Private_Type
1589 or else Ekind
(E
) = E_Limited_Private_Type
1590 or else Ekind
(E
) = E_Record_Type_With_Private
;
1591 end Is_Private_Base_Type
;
1593 --------------------------
1594 -- Is_Visible_Dependent --
1595 --------------------------
1597 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
1599 S
: constant Entity_Id
:= Scope
(Dep
);
1602 -- Renamings created for actual types have the visibility of the
1605 if Ekind
(S
) = E_Package
1606 and then Is_Generic_Instance
(S
)
1607 and then (Is_Generic_Actual_Type
(Dep
)
1608 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
1612 elsif not (Is_Derived_Type
(Dep
))
1613 and then Is_Derived_Type
(Full_View
(Dep
))
1615 -- When instantiating a package body, the scope stack is empty,
1616 -- so check instead whether the dependent type is defined in
1617 -- the same scope as the instance itself.
1619 return In_Open_Scopes
(S
)
1620 or else (Is_Generic_Instance
(Current_Scope
)
1621 and then Scope
(Dep
) = Scope
(Current_Scope
));
1625 end Is_Visible_Dependent
;
1627 ----------------------------
1628 -- May_Need_Implicit_Body --
1629 ----------------------------
1631 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
1632 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
1633 S
: constant Node_Id
:= Parent
(P
);
1638 if not Has_Completion
(E
)
1639 and then Nkind
(P
) = N_Package_Declaration
1640 and then Present
(Activation_Chain_Entity
(P
))
1643 Make_Package_Body
(Sloc
(E
),
1644 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
1645 Chars
=> Chars
(E
)),
1646 Declarations
=> New_List
);
1648 if Nkind
(S
) = N_Package_Specification
then
1649 if Present
(Private_Declarations
(S
)) then
1650 Decls
:= Private_Declarations
(S
);
1652 Decls
:= Visible_Declarations
(S
);
1655 Decls
:= Declarations
(S
);
1661 end May_Need_Implicit_Body
;
1663 ----------------------
1664 -- New_Private_Type --
1665 ----------------------
1667 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
1671 if Limited_Present
(Def
) then
1672 Set_Ekind
(Id
, E_Limited_Private_Type
);
1674 Set_Ekind
(Id
, E_Private_Type
);
1678 Set_Has_Delayed_Freeze
(Id
);
1679 Set_Is_First_Subtype
(Id
);
1680 Init_Size_Align
(Id
);
1682 Set_Is_Constrained
(Id
,
1683 No
(Discriminant_Specifications
(N
))
1684 and then not Unknown_Discriminants_Present
(N
));
1686 -- Set tagged flag before processing discriminants, to catch
1689 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
1691 Set_Discriminant_Constraint
(Id
, No_Elist
);
1692 Set_Stored_Constraint
(Id
, No_Elist
);
1694 if Present
(Discriminant_Specifications
(N
)) then
1696 Process_Discriminants
(N
);
1699 elsif Unknown_Discriminants_Present
(N
) then
1700 Set_Has_Unknown_Discriminants
(Id
);
1703 Set_Private_Dependents
(Id
, New_Elmt_List
);
1705 if Tagged_Present
(Def
) then
1706 Set_Ekind
(Id
, E_Record_Type_With_Private
);
1707 Make_Class_Wide_Type
(Id
);
1708 Set_Primitive_Operations
(Id
, New_Elmt_List
);
1709 Set_Is_Abstract
(Id
, Abstract_Present
(Def
));
1710 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
1711 Set_Has_Delayed_Freeze
(Id
, True);
1713 elsif Abstract_Present
(Def
) then
1714 Error_Msg_N
("only a tagged type can be abstract", N
);
1716 end New_Private_Type
;
1718 ----------------------------
1719 -- Uninstall_Declarations --
1720 ----------------------------
1722 procedure Uninstall_Declarations
(P
: Entity_Id
) is
1723 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
1726 Priv_Elmt
: Elmt_Id
;
1727 Priv_Sub
: Entity_Id
;
1729 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
1730 -- Copy to the private declaration the attributes of the full view
1731 -- that need to be available for the partial view also.
1733 function Type_In_Use
(T
: Entity_Id
) return Boolean;
1734 -- Check whether type or base type appear in an active use_type clause
1736 ------------------------------
1737 -- Preserve_Full_Attributes --
1738 ------------------------------
1740 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
1741 Priv_Is_Base_Type
: constant Boolean := Priv
= Base_Type
(Priv
);
1744 Set_Size_Info
(Priv
, (Full
));
1745 Set_RM_Size
(Priv
, RM_Size
(Full
));
1746 Set_Size_Known_At_Compile_Time
(Priv
, Size_Known_At_Compile_Time
1748 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
1749 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
1750 Set_Is_Ada_2005
(Priv
, Is_Ada_2005
(Full
));
1752 if Is_Unchecked_Union
(Full
) then
1753 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
1755 -- Why is atomic not copied here ???
1757 if Referenced
(Full
) then
1758 Set_Referenced
(Priv
);
1761 if Priv_Is_Base_Type
then
1762 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
1763 Set_Finalize_Storage_Only
(Priv
, Finalize_Storage_Only
1764 (Base_Type
(Full
)));
1765 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
1766 Set_Has_Controlled_Component
(Priv
, Has_Controlled_Component
1767 (Base_Type
(Full
)));
1770 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
1772 if Is_Tagged_Type
(Priv
)
1773 and then Is_Tagged_Type
(Full
)
1774 and then not Error_Posted
(Full
)
1776 if Priv_Is_Base_Type
then
1778 -- Ada 2005 (AI-345): The full view of a type implementing
1779 -- an interface can be a task type.
1781 -- type T is new I with private;
1783 -- task type T is new I with ...
1785 if Is_Interface
(Etype
(Priv
))
1786 and then Is_Concurrent_Type
(Base_Type
(Full
))
1788 -- Protect the frontend against previous errors
1790 if Present
(Corresponding_Record_Type
1793 Set_Access_Disp_Table
1794 (Priv
, Access_Disp_Table
1795 (Corresponding_Record_Type
(Base_Type
(Full
))));
1797 -- Generic context, or previous errors
1804 Set_Access_Disp_Table
1805 (Priv
, Access_Disp_Table
(Base_Type
(Full
)));
1809 Set_First_Entity
(Priv
, First_Entity
(Full
));
1810 Set_Last_Entity
(Priv
, Last_Entity
(Full
));
1811 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
1813 end Preserve_Full_Attributes
;
1819 function Type_In_Use
(T
: Entity_Id
) return Boolean is
1821 return Scope
(Base_Type
(T
)) = P
1822 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
1825 -- Start of processing for Uninstall_Declarations
1828 Id
:= First_Entity
(P
);
1830 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1831 if Debug_Flag_E
then
1832 Write_Str
("unlinking visible entity ");
1833 Write_Int
(Int
(Id
));
1837 -- On exit from the package scope, we must preserve the visibility
1838 -- established by use clauses in the current scope. Two cases:
1840 -- a) If the entity is an operator, it may be a primitive operator of
1841 -- a type for which there is a visible use-type clause.
1843 -- b) for other entities, their use-visibility is determined by a
1844 -- visible use clause for the package itself. For a generic instance,
1845 -- the instantiation of the formals appears in the visible part,
1846 -- but the formals are private and remain so.
1848 if Ekind
(Id
) = E_Function
1849 and then Is_Operator_Symbol_Name
(Chars
(Id
))
1850 and then not Is_Hidden
(Id
)
1851 and then not Error_Posted
(Id
)
1853 Set_Is_Potentially_Use_Visible
(Id
,
1855 or else Type_In_Use
(Etype
(Id
))
1856 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
1857 or else (Present
(Next_Formal
(First_Formal
(Id
)))
1860 (Etype
(Next_Formal
(First_Formal
(Id
))))));
1862 Set_Is_Potentially_Use_Visible
(Id
,
1863 In_Use
(P
) and not Is_Hidden
(Id
));
1866 -- Local entities are not immediately visible outside of the package
1868 Set_Is_Immediately_Visible
(Id
, False);
1870 -- If this is a private type with a full view (for example a local
1871 -- subtype of a private type declared elsewhere), ensure that the
1872 -- full view is also removed from visibility: it may be exposed when
1873 -- swapping views in an instantiation.
1876 and then Present
(Full_View
(Id
))
1878 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
1881 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
1882 Check_Abstract_Overriding
(Id
);
1885 if (Ekind
(Id
) = E_Private_Type
1886 or else Ekind
(Id
) = E_Limited_Private_Type
)
1887 and then No
(Full_View
(Id
))
1888 and then not Is_Generic_Type
(Id
)
1889 and then not Is_Derived_Type
(Id
)
1891 Error_Msg_N
("missing full declaration for private type&", Id
);
1893 elsif Ekind
(Id
) = E_Record_Type_With_Private
1894 and then not Is_Generic_Type
(Id
)
1895 and then No
(Full_View
(Id
))
1897 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
1898 Error_Msg_N
("missing full declaration for private type&", Id
);
1901 ("missing full declaration for private extension", Id
);
1904 elsif Ekind
(Id
) = E_Constant
1905 and then No
(Constant_Value
(Id
))
1906 and then No
(Full_View
(Id
))
1907 and then not Is_Imported
(Id
)
1908 and then (Nkind
(Parent
(Id
)) /= N_Object_Declaration
1909 or else not No_Initialization
(Parent
(Id
)))
1911 if not Has_Private_Declaration
(Etype
(Id
)) then
1913 -- We assume that the user did not not intend a deferred
1914 -- constant declaration, and the expression is just missing.
1917 ("constant declaration requires initialization expression",
1920 if Is_Limited_Type
(Etype
(Id
)) then
1922 ("\else remove keyword CONSTANT from declaration",
1928 ("missing full declaration for deferred constant ('R'M 7.4)",
1931 if Is_Limited_Type
(Etype
(Id
)) then
1933 ("\else remove keyword CONSTANT from declaration",
1942 -- If the specification was installed as the parent of a public child
1943 -- unit, the private declarations were not installed, and there is
1946 if not In_Private_Part
(P
) then
1949 Set_In_Private_Part
(P
, False);
1952 -- Make private entities invisible and exchange full and private
1953 -- declarations for private types.
1955 while Present
(Id
) loop
1956 if Debug_Flag_E
then
1957 Write_Str
("unlinking private entity ");
1958 Write_Int
(Int
(Id
));
1962 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
1963 Check_Abstract_Overriding
(Id
);
1966 Set_Is_Immediately_Visible
(Id
, False);
1968 if Is_Private_Base_Type
(Id
)
1969 and then Present
(Full_View
(Id
))
1971 Full
:= Full_View
(Id
);
1973 -- If the partial view is not declared in the visible part
1974 -- of the package (as is the case when it is a type derived
1975 -- from some other private type in the private part of the
1976 -- current package), no exchange takes place.
1979 or else List_Containing
(Parent
(Id
))
1980 /= Visible_Declarations
(Specification
(Decl
))
1985 -- The entry in the private part points to the full declaration,
1986 -- which is currently visible. Exchange them so only the private
1987 -- type declaration remains accessible, and link private and
1988 -- full declaration in the opposite direction. Before the actual
1989 -- exchange, we copy back attributes of the full view that
1990 -- must be available to the partial view too.
1992 Preserve_Full_Attributes
(Id
, Full
);
1994 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
1996 if Is_Indefinite_Subtype
(Full
)
1997 and then not Is_Indefinite_Subtype
(Id
)
2000 ("full view of type must be definite subtype", Full
);
2003 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2005 -- Swap out the subtypes and derived types of Id that were
2006 -- compiled in this scope, or installed previously by
2007 -- Install_Private_Declarations.
2008 -- Before we do the swap, we verify the presence of the
2009 -- Full_View field which may be empty due to a swap by
2010 -- a previous call to End_Package_Scope (e.g. from the
2011 -- freezing mechanism).
2013 while Present
(Priv_Elmt
) loop
2014 Priv_Sub
:= Node
(Priv_Elmt
);
2016 if Present
(Full_View
(Priv_Sub
)) then
2018 if Scope
(Priv_Sub
) = P
2019 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
2021 Set_Is_Immediately_Visible
(Priv_Sub
, False);
2024 if Is_Visible_Dependent
(Priv_Sub
) then
2025 Preserve_Full_Attributes
2026 (Priv_Sub
, Full_View
(Priv_Sub
));
2027 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
2028 Exchange_Declarations
(Priv_Sub
);
2032 Next_Elmt
(Priv_Elmt
);
2035 -- Now restore the type itself to its private view
2037 Exchange_Declarations
(Id
);
2039 elsif Ekind
(Id
) = E_Incomplete_Type
2040 and then No
(Full_View
(Id
))
2042 -- Mark Taft amendment types
2044 Set_Has_Completion_In_Body
(Id
);
2046 elsif not Is_Child_Unit
(Id
)
2047 and then (not Is_Private_Type
(Id
)
2048 or else No
(Full_View
(Id
)))
2051 Set_Is_Potentially_Use_Visible
(Id
, False);
2057 end Uninstall_Declarations
;
2059 ------------------------
2060 -- Unit_Requires_Body --
2061 ------------------------
2063 function Unit_Requires_Body
(P
: Entity_Id
) return Boolean is
2067 -- Imported entity never requires body. Right now, only
2068 -- subprograms can be imported, but perhaps in the future
2069 -- we will allow import of packages.
2071 if Is_Imported
(P
) then
2074 -- Body required if library package with pragma Elaborate_Body
2076 elsif Has_Pragma_Elaborate_Body
(P
) then
2079 -- Body required if subprogram
2081 elsif Is_Subprogram
(P
) or else Is_Generic_Subprogram
(P
) then
2084 -- Treat a block as requiring a body
2086 elsif Ekind
(P
) = E_Block
then
2089 elsif Ekind
(P
) = E_Package
2090 and then Nkind
(Parent
(P
)) = N_Package_Specification
2091 and then Present
(Generic_Parent
(Parent
(P
)))
2094 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(P
));
2097 if Has_Pragma_Elaborate_Body
(G_P
) then
2103 -- Otherwise search entity chain for entity requiring completion
2105 E
:= First_Entity
(P
);
2106 while Present
(E
) loop
2108 -- Always ignore child units. Child units get added to the entity
2109 -- list of a parent unit, but are not original entities of the
2110 -- parent, and so do not affect whether the parent needs a body.
2112 if Is_Child_Unit
(E
) then
2115 -- Ignore formal packages and their renamings
2117 elsif Ekind
(E
) = E_Package
2118 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
2119 N_Formal_Package_Declaration
2123 -- Otherwise test to see if entity requires a completion
2125 elsif (Is_Overloadable
(E
)
2126 and then Ekind
(E
) /= E_Enumeration_Literal
2127 and then Ekind
(E
) /= E_Operator
2128 and then not Is_Abstract
(E
)
2129 and then not Has_Completion
(E
))
2132 (Ekind
(E
) = E_Package
2134 and then not Has_Completion
(E
)
2135 and then Unit_Requires_Body
(E
))
2138 (Ekind
(E
) = E_Incomplete_Type
and then No
(Full_View
(E
)))
2141 ((Ekind
(E
) = E_Task_Type
or else
2142 Ekind
(E
) = E_Protected_Type
)
2143 and then not Has_Completion
(E
))
2146 (Ekind
(E
) = E_Generic_Package
and then E
/= P
2147 and then not Has_Completion
(E
)
2148 and then Unit_Requires_Body
(E
))
2151 (Is_Generic_Subprogram
(E
)
2152 and then not Has_Completion
(E
))
2157 -- Entity that does not require completion
2167 end Unit_Requires_Body
;