1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2004, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 -- This package contains the routines to process package specifications and
28 -- bodies. The most important semantic aspects of package processing are the
29 -- handling of private and full declarations, and the construction of
30 -- dispatch tables for tagged types.
32 with Atree
; use Atree
;
33 with Debug
; use Debug
;
34 with Einfo
; use Einfo
;
35 with Elists
; use Elists
;
36 with Errout
; use Errout
;
37 with Exp_Disp
; use Exp_Disp
;
38 with Exp_Dbug
; use Exp_Dbug
;
40 with Lib
.Xref
; use Lib
.Xref
;
41 with Namet
; use Namet
;
42 with Nmake
; use Nmake
;
43 with Nlists
; use Nlists
;
45 with Output
; use Output
;
47 with Sem_Cat
; use Sem_Cat
;
48 with Sem_Ch3
; use Sem_Ch3
;
49 with Sem_Ch6
; use Sem_Ch6
;
50 with Sem_Ch8
; use Sem_Ch8
;
51 with Sem_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
(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
(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 Generate_Definition
(Id
);
628 Set_Ekind
(Id
, E_Package
);
629 Set_Etype
(Id
, Standard_Void_Type
);
633 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
634 Set_Is_Pure
(Id
, PF
);
636 Set_Categorization_From_Pragmas
(N
);
639 Write_Str
("==== Compiling package spec ");
640 Write_Name
(Chars
(Id
));
641 Write_Str
(" from ");
642 Write_Location
(Sloc
(N
));
646 Analyze
(Specification
(N
));
647 Validate_Categorization_Dependency
(N
, Id
);
648 End_Package_Scope
(Id
);
650 -- For a compilation unit, indicate whether it needs a body, and
651 -- whether elaboration warnings may be meaningful on it.
653 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
654 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
656 if not Body_Required
(Parent
(N
)) then
657 Set_Suppress_Elaboration_Warnings
(Id
);
660 Validate_RT_RAT_Component
(N
);
662 end Analyze_Package_Declaration
;
664 -----------------------------------
665 -- Analyze_Package_Specification --
666 -----------------------------------
668 -- Note that this code is shared for the analysis of generic package
669 -- specs (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
671 procedure Analyze_Package_Specification
(N
: Node_Id
) is
672 Id
: constant Entity_Id
:= Defining_Entity
(N
);
673 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
674 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
675 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
678 Public_Child
: Boolean;
680 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
681 -- Clears constant indications (Never_Set_In_Source, Constant_Value,
682 -- and Is_True_Constant) on all variables that are entities of Id,
683 -- and on the chain whose first element is FE. A recursive call is
684 -- made for all packages and generic packages.
686 procedure Generate_Parent_References
;
687 -- For a child unit, generate references to parent units, for
688 -- GPS navigation purposes.
690 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
691 -- Child and Unit are entities of compilation units. True if Child
692 -- is a public child of Parent as defined in 10.1.1
694 procedure Inspect_Deferred_Constant_Completion
;
695 -- Examines the deferred constants in the private part of the package
696 -- specification. Emits the error message "constant declaration requires
697 -- initialization expression " if not completed by an Import pragma.
699 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
700 -- Detects all incomplete or private type declarations having a known
701 -- discriminant part that are completed by an Unchecked_Union. Emits
702 -- the error message "Unchecked_Union may not complete discriminated
705 ---------------------
706 -- Clear_Constants --
707 ---------------------
709 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
713 -- Ignore package renamings, not interesting and they can
714 -- cause self referential loops in the code below.
716 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
720 -- Note: in the loop below, the check for Next_Entity pointing
721 -- back to the package entity seems very odd, but it is needed,
722 -- because this kind of unexpected circularity does occur ???
725 while Present
(E
) and then E
/= Id
loop
726 if Ekind
(E
) = E_Variable
then
727 Set_Never_Set_In_Source
(E
, False);
728 Set_Is_True_Constant
(E
, False);
729 Set_Current_Value
(E
, Empty
);
730 Set_Is_Known_Non_Null
(E
, False);
732 elsif Ekind
(E
) = E_Package
734 Ekind
(E
) = E_Generic_Package
736 Clear_Constants
(E
, First_Entity
(E
));
737 Clear_Constants
(E
, First_Private_Entity
(E
));
744 --------------------------------
745 -- Generate_Parent_References --
746 --------------------------------
748 procedure Generate_Parent_References
is
749 Decl
: constant Node_Id
:= Parent
(N
);
752 if Id
= Cunit_Entity
(Main_Unit
)
753 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
755 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
757 elsif Nkind
(Unit
(Cunit
(Main_Unit
))) /= N_Subprogram_Body
758 and then Nkind
(Unit
(Cunit
(Main_Unit
))) /= N_Subunit
760 -- If current unit is an ancestor of main unit, generate
761 -- a reference to its own parent.
765 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
768 if Nkind
(Main_Spec
) = N_Package_Body
then
769 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
772 U
:= Parent_Spec
(Main_Spec
);
773 while Present
(U
) loop
774 if U
= Parent
(Decl
) then
775 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
778 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
782 U
:= Parent_Spec
(Unit
(U
));
787 end Generate_Parent_References
;
789 ---------------------
790 -- Is_Public_Child --
791 ---------------------
793 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
795 if not Is_Private_Descendant
(Child
) then
799 return not Private_Present
(
800 Parent
(Unit_Declaration_Node
(Child
)));
802 return Is_Public_Child
(Scope
(Child
), Unit
);
807 ------------------------------------------
808 -- Inspect_Deferred_Constant_Completion --
809 ------------------------------------------
811 procedure Inspect_Deferred_Constant_Completion
is
815 Decl
:= First
(Priv_Decls
);
816 while Present
(Decl
) loop
818 -- Deferred constant signature
820 if Nkind
(Decl
) = N_Object_Declaration
821 and then Constant_Present
(Decl
)
822 and then No
(Expression
(Decl
))
824 -- No need to check internally generated constants
826 and then Comes_From_Source
(Decl
)
828 -- The constant is not completed. A full object declaration
829 -- or a pragma Import complete a deferred constant.
831 and then not Has_Completion
(Defining_Identifier
(Decl
))
834 ("constant declaration requires initialization expression",
835 Defining_Identifier
(Decl
));
840 end Inspect_Deferred_Constant_Completion
;
842 ----------------------------------------
843 -- Inspect_Unchecked_Union_Completion --
844 ----------------------------------------
846 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
847 Decl
: Node_Id
:= First
(Decls
);
850 while Present
(Decl
) loop
852 -- We are looking at an incomplete or private type declaration
853 -- with a known_discriminant_part whose full view is an
856 if (Nkind
(Decl
) = N_Incomplete_Type_Declaration
858 Nkind
(Decl
) = N_Private_Type_Declaration
)
859 and then Has_Discriminants
(Defining_Identifier
(Decl
))
860 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
861 and then Is_Unchecked_Union
862 (Full_View
(Defining_Identifier
(Decl
)))
864 Error_Msg_N
("completion of discriminated partial view" &
865 " cannot be an Unchecked_Union",
866 Full_View
(Defining_Identifier
(Decl
)));
871 end Inspect_Unchecked_Union_Completion
;
873 -- Start of processing for Analyze_Package_Specification
876 if Present
(Vis_Decls
) then
877 Analyze_Declarations
(Vis_Decls
);
880 -- Verify that incomplete types have received full declarations.
882 E
:= First_Entity
(Id
);
883 while Present
(E
) loop
884 if Ekind
(E
) = E_Incomplete_Type
885 and then No
(Full_View
(E
))
887 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
893 if Is_Remote_Call_Interface
(Id
)
894 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
896 Validate_RCI_Declarations
(Id
);
899 -- Save global references in the visible declarations, before
900 -- installing private declarations of parent unit if there is one,
901 -- because the privacy status of types defined in the parent will
902 -- change. This is only relevant for generic child units, but is
903 -- done in all cases for uniformity.
905 if Ekind
(Id
) = E_Generic_Package
906 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
909 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
910 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
913 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
914 Save_Global_References
(Orig_Decl
);
915 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
919 -- If package is a public child unit, then make the private
920 -- declarations of the parent visible.
922 Public_Child
:= False;
931 Par_Spec
:= Parent_Spec
(Parent
(N
));
933 -- If the package is formal package of an enclosing generic, is is
934 -- transformed into a local generic declaration, and compiled to make
935 -- its spec available. We need to retrieve the original generic to
936 -- determine whether it is a child unit, and install its parents.
940 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
942 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
943 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
946 if Present
(Par_Spec
) then
947 Generate_Parent_References
;
949 while Scope
(Par
) /= Standard_Standard
950 and then Is_Public_Child
(Id
, Par
)
952 Public_Child
:= True;
954 Install_Private_Declarations
(Par
);
955 Install_Private_With_Clauses
(Par
);
956 Pack_Decl
:= Unit_Declaration_Node
(Par
);
957 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
962 if Is_Compilation_Unit
(Id
) then
963 Install_Private_With_Clauses
(Id
);
966 -- Analyze private part if present. The flag In_Private_Part is
967 -- reset in End_Package_Scope.
969 L
:= Last_Entity
(Id
);
971 if Present
(Priv_Decls
) then
972 Set_In_Private_Part
(Id
);
974 -- Upon entering a public child's private part, it may be
975 -- necessary to declare subprograms that were derived in
976 -- the package visible part but not yet made visible.
979 Declare_Inherited_Private_Subprograms
(Id
);
982 Analyze_Declarations
(Priv_Decls
);
984 -- Check the private declarations for incomplete deferred constants
986 Inspect_Deferred_Constant_Completion
;
988 -- The first private entity is the immediate follower of the last
989 -- visible entity, if there was one.
992 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
994 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
997 -- There may be inherited private subprograms that need to be
998 -- declared, even in the absence of an explicit private part.
999 -- If there are any public declarations in the package and
1000 -- the package is a public child unit, then an implicit private
1003 elsif Present
(L
) and then Public_Child
then
1004 Set_In_Private_Part
(Id
);
1005 Declare_Inherited_Private_Subprograms
(Id
);
1006 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1009 -- Check rule of 3.6(11), which in general requires
1010 -- waiting till all full types have been seen.
1012 E
:= First_Entity
(Id
);
1013 while Present
(E
) loop
1014 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1015 Check_Aliased_Component_Types
(E
);
1021 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1022 -- declaration having a known_discriminant_part shall not be an
1023 -- Unchecked_Union type.
1025 if Present
(Vis_Decls
) then
1026 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1029 if Present
(Priv_Decls
) then
1030 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1033 if Ekind
(Id
) = E_Generic_Package
1034 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1035 and then Present
(Priv_Decls
)
1037 -- Save global references in private declarations, ignoring the
1038 -- visible declarations that were processed earlier.
1041 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1042 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1043 Save_Form
: constant List_Id
:=
1044 Generic_Formal_Declarations
(Orig_Decl
);
1047 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1048 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1049 Save_Global_References
(Orig_Decl
);
1050 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1051 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1055 Process_End_Label
(N
, 'e', Id
);
1057 -- For the case of a library level package, we must go through all
1058 -- the entities clearing the indications that the value may be
1059 -- constant and not modified. Why? Because any client of this
1060 -- package may modify these values freely from anywhere. This
1061 -- also applies to any nested packages or generic packages.
1063 -- For now we unconditionally clear constants for packages that
1064 -- are instances of generic packages. The reason is that we do not
1065 -- have the body yet, and we otherwise think things are unreferenced
1066 -- when they are not. This should be fixed sometime (the effect is
1067 -- not terrible, we just lose some warnings, and also some cases
1068 -- of value propagation) ???
1070 if Is_Library_Level_Entity
(Id
)
1071 or else Is_Generic_Instance
(Id
)
1073 Clear_Constants
(Id
, First_Entity
(Id
));
1074 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1076 end Analyze_Package_Specification
;
1078 --------------------------------------
1079 -- Analyze_Private_Type_Declaration --
1080 --------------------------------------
1082 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1083 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1084 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1087 Generate_Definition
(Id
);
1088 Set_Is_Pure
(Id
, PF
);
1089 Init_Size_Align
(Id
);
1091 if (Ekind
(Current_Scope
) /= E_Package
1092 and then Ekind
(Current_Scope
) /= E_Generic_Package
)
1093 or else In_Private_Part
(Current_Scope
)
1095 Error_Msg_N
("invalid context for private declaration", N
);
1098 New_Private_Type
(N
, Id
, N
);
1099 Set_Depends_On_Private
(Id
);
1100 end Analyze_Private_Type_Declaration
;
1102 -------------------------------------------
1103 -- Declare_Inherited_Private_Subprograms --
1104 -------------------------------------------
1106 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1110 Op_Elmt_2
: Elmt_Id
;
1111 Prim_Op
: Entity_Id
;
1112 New_Op
: Entity_Id
:= Empty
;
1113 Parent_Subp
: Entity_Id
;
1114 Found_Explicit
: Boolean;
1115 Decl_Privates
: Boolean;
1117 function Has_Overriding_Pragma
(Subp
: Entity_Id
) return Boolean;
1118 -- Check whether a pragma Overriding has been provided for a primitive
1119 -- operation that is found to be overriding in the private part.
1121 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1122 -- Check whether an inherited subprogram is an operation of an
1123 -- untagged derived type.
1125 ---------------------------
1126 -- Has_Overriding_Pragma --
1127 ---------------------------
1129 function Has_Overriding_Pragma
(Subp
: Entity_Id
) return Boolean is
1130 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Subp
);
1135 or else Nkind
(Decl
) /= N_Subprogram_Declaration
1136 or else No
(Next
(Decl
))
1141 Prag
:= Next
(Decl
);
1143 while Present
(Prag
)
1144 and then Nkind
(Prag
) = N_Pragma
1146 if Chars
(Prag
) = Name_Overriding
1147 or else Chars
(Prag
) = Name_Optional_Overriding
1157 end Has_Overriding_Pragma
;
1159 ---------------------
1160 -- Is_Primitive_Of --
1161 ---------------------
1163 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1167 if Etype
(S
) = T
then
1171 Formal
:= First_Formal
(S
);
1173 while Present
(Formal
) loop
1174 if Etype
(Formal
) = T
then
1178 Next_Formal
(Formal
);
1183 end Is_Primitive_Of
;
1185 -- Start of processing for Declare_Inherited_Private_Subprograms
1188 E
:= First_Entity
(Id
);
1189 while Present
(E
) loop
1191 -- If the entity is a nonprivate type extension whose parent
1192 -- type is declared in an open scope, then the type may have
1193 -- inherited operations that now need to be made visible.
1194 -- Ditto if the entity is a formal derived type in a child unit.
1196 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1198 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1199 and then Is_Generic_Type
(E
)))
1200 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1201 and then E
= Base_Type
(E
)
1203 if Is_Tagged_Type
(E
) then
1204 Op_List
:= Primitive_Operations
(E
);
1206 Decl_Privates
:= False;
1208 Op_Elmt
:= First_Elmt
(Op_List
);
1209 while Present
(Op_Elmt
) loop
1210 Prim_Op
:= Node
(Op_Elmt
);
1212 -- If the primitive operation is an implicit operation
1213 -- with an internal name whose parent operation has
1214 -- a normal name, then we now need to either declare the
1215 -- operation (i.e., make it visible), or replace it
1216 -- by an overriding operation if one exists.
1218 if Present
(Alias
(Prim_Op
))
1219 and then not Comes_From_Source
(Prim_Op
)
1220 and then Is_Internal_Name
(Chars
(Prim_Op
))
1221 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1223 Parent_Subp
:= Alias
(Prim_Op
);
1225 Found_Explicit
:= False;
1226 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1227 while Present
(Op_Elmt_2
) loop
1228 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
1229 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
1231 -- The private inherited operation has been
1232 -- overridden by an explicit subprogram, so
1233 -- change the private op's list element to
1234 -- designate the explicit so the explicit
1235 -- one will get the right dispatching slot.
1237 New_Op
:= Node
(Op_Elmt_2
);
1238 Replace_Elmt
(Op_Elmt
, New_Op
);
1239 Remove_Elmt
(Op_List
, Op_Elmt_2
);
1240 Found_Explicit
:= True;
1241 Decl_Privates
:= True;
1243 -- If explicit_overriding is in effect, check that
1244 -- the overriding operation is properly labelled.
1246 if Explicit_Overriding
1247 and then Comes_From_Source
(New_Op
)
1248 and then not Has_Overriding_Pragma
(New_Op
)
1251 ("Missing overriding pragma for&",
1258 Next_Elmt
(Op_Elmt_2
);
1261 if not Found_Explicit
then
1263 (New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1266 (Is_Dispatching_Operation
(New_Op
)
1267 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
1269 -- Substitute the new operation for the old one
1270 -- in the type's primitive operations list. Since
1271 -- the new operation was also just added to the end
1272 -- of list, the last element must be removed.
1274 -- (Question: is there a simpler way of declaring
1275 -- the operation, say by just replacing the name
1276 -- of the earlier operation, reentering it in the
1277 -- in the symbol table (how?), and marking it as
1280 Replace_Elmt
(Op_Elmt
, New_Op
);
1281 Remove_Last_Elmt
(Op_List
);
1282 Decl_Privates
:= True;
1286 Next_Elmt
(Op_Elmt
);
1289 -- The type's DT attributes need to be recalculated
1290 -- in the case where private dispatching operations
1291 -- have been added or overridden. Normally this action
1292 -- occurs during type freezing, but we force it here
1293 -- since the type may already have been frozen (e.g.,
1294 -- if the type's package has an empty private part).
1295 -- This can only be done if expansion is active, otherwise
1296 -- Tag may not be present.
1299 and then Expander_Active
1301 Set_All_DT_Position
(E
);
1305 -- Non-tagged type, scan forward to locate
1306 -- inherited hidden operations.
1308 Prim_Op
:= Next_Entity
(E
);
1310 while Present
(Prim_Op
) loop
1311 if Is_Subprogram
(Prim_Op
)
1312 and then Present
(Alias
(Prim_Op
))
1313 and then not Comes_From_Source
(Prim_Op
)
1314 and then Is_Internal_Name
(Chars
(Prim_Op
))
1315 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1316 and then Is_Primitive_Of
(E
, Prim_Op
)
1318 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1321 Next_Entity
(Prim_Op
);
1328 end Declare_Inherited_Private_Subprograms
;
1330 -----------------------
1331 -- End_Package_Scope --
1332 -----------------------
1334 procedure End_Package_Scope
(P
: Entity_Id
) is
1336 Uninstall_Declarations
(P
);
1338 end End_Package_Scope
;
1340 ---------------------------
1341 -- Exchange_Declarations --
1342 ---------------------------
1344 procedure Exchange_Declarations
(Id
: Entity_Id
) is
1345 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
1346 H1
: constant Entity_Id
:= Homonym
(Id
);
1347 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
1352 -- If missing full declaration for type, nothing to exchange
1354 if No
(Full_Id
) then
1358 -- Otherwise complete the exchange, and preserve semantic links
1360 Next2
:= Next_Entity
(Full_Id
);
1361 H2
:= Homonym
(Full_Id
);
1363 -- Reset full declaration pointer to reflect the switched entities
1364 -- and readjust the next entity chains.
1366 Exchange_Entities
(Id
, Full_Id
);
1368 Set_Next_Entity
(Id
, Next1
);
1369 Set_Homonym
(Id
, H1
);
1371 Set_Full_View
(Full_Id
, Id
);
1372 Set_Next_Entity
(Full_Id
, Next2
);
1373 Set_Homonym
(Full_Id
, H2
);
1374 end Exchange_Declarations
;
1376 ----------------------------
1377 -- Install_Package_Entity --
1378 ----------------------------
1380 procedure Install_Package_Entity
(Id
: Entity_Id
) is
1382 if not Is_Internal
(Id
) then
1383 if Debug_Flag_E
then
1384 Write_Str
("Install: ");
1385 Write_Name
(Chars
(Id
));
1389 if not Is_Child_Unit
(Id
) then
1390 Set_Is_Immediately_Visible
(Id
);
1394 end Install_Package_Entity
;
1396 ----------------------------------
1397 -- Install_Private_Declarations --
1398 ----------------------------------
1400 procedure Install_Private_Declarations
(P
: Entity_Id
) is
1402 Priv_Elmt
: Elmt_Id
;
1407 -- First exchange declarations for private types, so that the
1408 -- full declaration is visible. For each private type, we check
1409 -- its Private_Dependents list and also exchange any subtypes of
1410 -- or derived types from it. Finally, if this is a Taft amendment
1411 -- type, the incomplete declaration is irrelevant, and we want to
1412 -- link the eventual full declaration with the original private
1413 -- one so we also skip the exchange.
1415 Id
:= First_Entity
(P
);
1416 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1418 if Is_Private_Base_Type
(Id
)
1419 and then Comes_From_Source
(Full_View
(Id
))
1420 and then Present
(Full_View
(Id
))
1421 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
1422 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
1424 -- If there is a use-type clause on the private type, set the
1425 -- full view accordingly.
1427 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
1428 Full
:= Full_View
(Id
);
1430 if Is_Private_Base_Type
(Full
)
1431 and then Has_Private_Declaration
(Full
)
1432 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
1433 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
1434 and then In_Package_Body
(Current_Scope
)
1435 and then not Is_Private_Type
(Etype
(Full
))
1437 -- This is the completion of a private type by a derivation
1438 -- from another private type which is not private anymore. This
1439 -- can only happen in a package nested within a child package,
1440 -- when the parent type is defined in the parent unit. At this
1441 -- point the current type is not private either, and we have to
1442 -- install the underlying full view, which is now visible.
1444 if No
(Full_View
(Full
))
1445 and then Present
(Underlying_Full_View
(Full
))
1447 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
1448 Set_Underlying_Full_View
(Full
, Empty
);
1449 Set_Is_Frozen
(Full_View
(Id
));
1453 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1455 Exchange_Declarations
(Id
);
1456 Set_Is_Immediately_Visible
(Id
);
1458 while Present
(Priv_Elmt
) loop
1459 Priv
:= Node
(Priv_Elmt
);
1461 -- Before the exchange, verify that the presence of the
1462 -- Full_View field. It will be empty if the entity
1463 -- has already been installed due to a previous call.
1465 if Present
(Full_View
(Priv
))
1466 and then Is_Visible_Dependent
(Priv
)
1469 -- For each subtype that is swapped, we also swap the
1470 -- reference to it in Private_Dependents, to allow access
1471 -- to it when we swap them out in End_Package_Scope.
1473 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
1474 Exchange_Declarations
(Priv
);
1475 Set_Is_Immediately_Visible
1476 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
1477 Set_Is_Potentially_Use_Visible
1478 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
1481 Next_Elmt
(Priv_Elmt
);
1488 -- Next make other declarations in the private part visible as well.
1490 Id
:= First_Private_Entity
(P
);
1492 while Present
(Id
) loop
1493 Install_Package_Entity
(Id
);
1494 Set_Is_Hidden
(Id
, False);
1498 -- Indicate that the private part is currently visible, so it can be
1499 -- properly reset on exit.
1501 Set_In_Private_Part
(P
);
1502 end Install_Private_Declarations
;
1504 ----------------------------------
1505 -- Install_Visible_Declarations --
1506 ----------------------------------
1508 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
1512 Id
:= First_Entity
(P
);
1514 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1515 Install_Package_Entity
(Id
);
1518 end Install_Visible_Declarations
;
1520 --------------------------
1521 -- Is_Private_Base_Type --
1522 --------------------------
1524 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
1526 return Ekind
(E
) = E_Private_Type
1527 or else Ekind
(E
) = E_Limited_Private_Type
1528 or else Ekind
(E
) = E_Record_Type_With_Private
;
1529 end Is_Private_Base_Type
;
1531 --------------------------
1532 -- Is_Visible_Dependent --
1533 --------------------------
1535 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
1537 S
: constant Entity_Id
:= Scope
(Dep
);
1540 -- Renamings created for actual types have the visibility of the
1543 if Ekind
(S
) = E_Package
1544 and then Is_Generic_Instance
(S
)
1545 and then (Is_Generic_Actual_Type
(Dep
)
1546 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
1550 elsif not (Is_Derived_Type
(Dep
))
1551 and then Is_Derived_Type
(Full_View
(Dep
))
1553 -- When instantiating a package body, the scope stack is empty,
1554 -- so check instead whether the dependent type is defined in
1555 -- the same scope as the instance itself.
1557 return In_Open_Scopes
(S
)
1558 or else (Is_Generic_Instance
(Current_Scope
)
1559 and then Scope
(Dep
) = Scope
(Current_Scope
));
1563 end Is_Visible_Dependent
;
1565 ----------------------------
1566 -- May_Need_Implicit_Body --
1567 ----------------------------
1569 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
1570 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
1571 S
: constant Node_Id
:= Parent
(P
);
1576 if not Has_Completion
(E
)
1577 and then Nkind
(P
) = N_Package_Declaration
1578 and then Present
(Activation_Chain_Entity
(P
))
1581 Make_Package_Body
(Sloc
(E
),
1582 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
1583 Chars
=> Chars
(E
)),
1584 Declarations
=> New_List
);
1586 if Nkind
(S
) = N_Package_Specification
then
1587 if Present
(Private_Declarations
(S
)) then
1588 Decls
:= Private_Declarations
(S
);
1590 Decls
:= Visible_Declarations
(S
);
1593 Decls
:= Declarations
(S
);
1599 end May_Need_Implicit_Body
;
1601 ----------------------
1602 -- New_Private_Type --
1603 ----------------------
1605 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
1609 if Limited_Present
(Def
) then
1610 Set_Ekind
(Id
, E_Limited_Private_Type
);
1612 Set_Ekind
(Id
, E_Private_Type
);
1616 Set_Has_Delayed_Freeze
(Id
);
1617 Set_Is_First_Subtype
(Id
);
1618 Init_Size_Align
(Id
);
1620 Set_Is_Constrained
(Id
,
1621 No
(Discriminant_Specifications
(N
))
1622 and then not Unknown_Discriminants_Present
(N
));
1624 -- Set tagged flag before processing discriminants, to catch
1627 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
1629 Set_Discriminant_Constraint
(Id
, No_Elist
);
1630 Set_Stored_Constraint
(Id
, No_Elist
);
1632 if Present
(Discriminant_Specifications
(N
)) then
1634 Process_Discriminants
(N
);
1637 elsif Unknown_Discriminants_Present
(N
) then
1638 Set_Has_Unknown_Discriminants
(Id
);
1641 Set_Private_Dependents
(Id
, New_Elmt_List
);
1643 if Tagged_Present
(Def
) then
1644 Set_Ekind
(Id
, E_Record_Type_With_Private
);
1645 Make_Class_Wide_Type
(Id
);
1646 Set_Primitive_Operations
(Id
, New_Elmt_List
);
1647 Set_Is_Abstract
(Id
, Abstract_Present
(Def
));
1648 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
1649 Set_Has_Delayed_Freeze
(Id
, True);
1651 elsif Abstract_Present
(Def
) then
1652 Error_Msg_N
("only a tagged type can be abstract", N
);
1654 end New_Private_Type
;
1656 ----------------------------
1657 -- Uninstall_Declarations --
1658 ----------------------------
1660 procedure Uninstall_Declarations
(P
: Entity_Id
) is
1661 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
1664 Priv_Elmt
: Elmt_Id
;
1665 Priv_Sub
: Entity_Id
;
1667 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
1668 -- Copy to the private declaration the attributes of the full view
1669 -- that need to be available for the partial view also.
1671 function Type_In_Use
(T
: Entity_Id
) return Boolean;
1672 -- Check whether type or base type appear in an active use_type clause.
1674 ------------------------------
1675 -- Preserve_Full_Attributes --
1676 ------------------------------
1678 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
1679 Priv_Is_Base_Type
: constant Boolean := Priv
= Base_Type
(Priv
);
1682 Set_Size_Info
(Priv
, (Full
));
1683 Set_RM_Size
(Priv
, RM_Size
(Full
));
1684 Set_Size_Known_At_Compile_Time
(Priv
, Size_Known_At_Compile_Time
1686 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
1687 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
1689 if Referenced
(Full
) then
1690 Set_Referenced
(Priv
);
1693 if Priv_Is_Base_Type
then
1694 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
1695 Set_Finalize_Storage_Only
(Priv
, Finalize_Storage_Only
1696 (Base_Type
(Full
)));
1697 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
1698 Set_Has_Controlled_Component
(Priv
, Has_Controlled_Component
1699 (Base_Type
(Full
)));
1702 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
1704 if Is_Tagged_Type
(Priv
)
1705 and then Is_Tagged_Type
(Full
)
1706 and then not Error_Posted
(Full
)
1708 if Priv_Is_Base_Type
then
1709 Set_Access_Disp_Table
(Priv
, Access_Disp_Table
1710 (Base_Type
(Full
)));
1713 Set_First_Entity
(Priv
, First_Entity
(Full
));
1714 Set_Last_Entity
(Priv
, Last_Entity
(Full
));
1715 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
1717 end Preserve_Full_Attributes
;
1723 function Type_In_Use
(T
: Entity_Id
) return Boolean is
1725 return Scope
(Base_Type
(T
)) = P
1726 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
1729 -- Start of processing for Uninstall_Declarations
1732 Id
:= First_Entity
(P
);
1734 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1735 if Debug_Flag_E
then
1736 Write_Str
("unlinking visible entity ");
1737 Write_Int
(Int
(Id
));
1741 -- On exit from the package scope, we must preserve the visibility
1742 -- established by use clauses in the current scope. Two cases:
1744 -- a) If the entity is an operator, it may be a primitive operator of
1745 -- a type for which there is a visible use-type clause.
1747 -- b) for other entities, their use-visibility is determined by a
1748 -- visible use clause for the package itself. For a generic instance,
1749 -- the instantiation of the formals appears in the visible part,
1750 -- but the formals are private and remain so.
1752 if Ekind
(Id
) = E_Function
1753 and then Is_Operator_Symbol_Name
(Chars
(Id
))
1754 and then not Is_Hidden
(Id
)
1755 and then not Error_Posted
(Id
)
1757 Set_Is_Potentially_Use_Visible
(Id
,
1759 or else Type_In_Use
(Etype
(Id
))
1760 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
1761 or else (Present
(Next_Formal
(First_Formal
(Id
)))
1764 (Etype
(Next_Formal
(First_Formal
(Id
))))));
1766 Set_Is_Potentially_Use_Visible
(Id
,
1767 In_Use
(P
) and not Is_Hidden
(Id
));
1770 -- Local entities are not immediately visible outside of the package.
1772 Set_Is_Immediately_Visible
(Id
, False);
1774 -- If this is a private type with a full view (for example a local
1775 -- subtype of a private type declared elsewhere), ensure that the
1776 -- full view is also removed from visibility: it may be exposed when
1777 -- swapping views in an instantiation.
1780 and then Present
(Full_View
(Id
))
1782 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
1785 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
1786 Check_Abstract_Overriding
(Id
);
1789 if (Ekind
(Id
) = E_Private_Type
1790 or else Ekind
(Id
) = E_Limited_Private_Type
)
1791 and then No
(Full_View
(Id
))
1792 and then not Is_Generic_Type
(Id
)
1793 and then not Is_Derived_Type
(Id
)
1795 Error_Msg_N
("missing full declaration for private type&", Id
);
1797 elsif Ekind
(Id
) = E_Record_Type_With_Private
1798 and then not Is_Generic_Type
(Id
)
1799 and then No
(Full_View
(Id
))
1801 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
1802 Error_Msg_N
("missing full declaration for private type&", Id
);
1805 ("missing full declaration for private extension", Id
);
1808 elsif Ekind
(Id
) = E_Constant
1809 and then No
(Constant_Value
(Id
))
1810 and then No
(Full_View
(Id
))
1811 and then not Is_Imported
(Id
)
1812 and then (Nkind
(Parent
(Id
)) /= N_Object_Declaration
1813 or else not No_Initialization
(Parent
(Id
)))
1815 if not Has_Private_Declaration
(Etype
(Id
)) then
1817 -- We assume that the user did not not intend a deferred
1818 -- constant declaration, and the expression is just missing.
1821 ("constant declaration requires initialization expression",
1824 if Is_Limited_Type
(Etype
(Id
)) then
1826 ("\else remove keyword CONSTANT from declaration",
1832 ("missing full declaration for deferred constant ('R'M 7.4)",
1835 if Is_Limited_Type
(Etype
(Id
)) then
1837 ("\else remove keyword CONSTANT from declaration",
1846 -- If the specification was installed as the parent of a public child
1847 -- unit, the private declarations were not installed, and there is
1850 if not In_Private_Part
(P
) then
1853 Set_In_Private_Part
(P
, False);
1856 -- Make private entities invisible and exchange full and private
1857 -- declarations for private types.
1859 while Present
(Id
) loop
1860 if Debug_Flag_E
then
1861 Write_Str
("unlinking private entity ");
1862 Write_Int
(Int
(Id
));
1866 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
1867 Check_Abstract_Overriding
(Id
);
1870 Set_Is_Immediately_Visible
(Id
, False);
1872 if Is_Private_Base_Type
(Id
)
1873 and then Present
(Full_View
(Id
))
1875 Full
:= Full_View
(Id
);
1877 -- If the partial view is not declared in the visible part
1878 -- of the package (as is the case when it is a type derived
1879 -- from some other private type in the private part of the
1880 -- current package), no exchange takes place.
1883 or else List_Containing
(Parent
(Id
))
1884 /= Visible_Declarations
(Specification
(Decl
))
1889 -- The entry in the private part points to the full declaration,
1890 -- which is currently visible. Exchange them so only the private
1891 -- type declaration remains accessible, and link private and
1892 -- full declaration in the opposite direction. Before the actual
1893 -- exchange, we copy back attributes of the full view that
1894 -- must be available to the partial view too.
1896 Preserve_Full_Attributes
(Id
, Full
);
1898 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
1900 if Is_Indefinite_Subtype
(Full
)
1901 and then not Is_Indefinite_Subtype
(Id
)
1904 ("full view of type must be definite subtype", Full
);
1907 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1908 Exchange_Declarations
(Id
);
1910 -- Swap out the subtypes and derived types of Id that were
1911 -- compiled in this scope, or installed previously by
1912 -- Install_Private_Declarations.
1913 -- Before we do the swap, we verify the presence of the
1914 -- Full_View field which may be empty due to a swap by
1915 -- a previous call to End_Package_Scope (e.g. from the
1916 -- freezing mechanism).
1918 while Present
(Priv_Elmt
) loop
1919 Priv_Sub
:= Node
(Priv_Elmt
);
1921 if Present
(Full_View
(Priv_Sub
)) then
1923 if Scope
(Priv_Sub
) = P
1924 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
1926 Set_Is_Immediately_Visible
(Priv_Sub
, False);
1929 if Is_Visible_Dependent
(Priv_Sub
) then
1930 Preserve_Full_Attributes
1931 (Priv_Sub
, Full_View
(Priv_Sub
));
1932 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
1933 Exchange_Declarations
(Priv_Sub
);
1937 Next_Elmt
(Priv_Elmt
);
1940 elsif Ekind
(Id
) = E_Incomplete_Type
1941 and then No
(Full_View
(Id
))
1943 -- Mark Taft amendment types
1945 Set_Has_Completion_In_Body
(Id
);
1947 elsif not Is_Child_Unit
(Id
)
1948 and then (not Is_Private_Type
(Id
)
1949 or else No
(Full_View
(Id
)))
1952 Set_Is_Potentially_Use_Visible
(Id
, False);
1958 end Uninstall_Declarations
;
1960 ------------------------
1961 -- Unit_Requires_Body --
1962 ------------------------
1964 function Unit_Requires_Body
(P
: Entity_Id
) return Boolean is
1968 -- Imported entity never requires body. Right now, only
1969 -- subprograms can be imported, but perhaps in the future
1970 -- we will allow import of packages.
1972 if Is_Imported
(P
) then
1975 -- Body required if library package with pragma Elaborate_Body
1977 elsif Has_Pragma_Elaborate_Body
(P
) then
1980 -- Body required if subprogram
1982 elsif Is_Subprogram
(P
) or else Is_Generic_Subprogram
(P
) then
1985 -- Treat a block as requiring a body
1987 elsif Ekind
(P
) = E_Block
then
1990 elsif Ekind
(P
) = E_Package
1991 and then Nkind
(Parent
(P
)) = N_Package_Specification
1992 and then Present
(Generic_Parent
(Parent
(P
)))
1995 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(P
));
1998 if Has_Pragma_Elaborate_Body
(G_P
) then
2004 -- Otherwise search entity chain for entity requiring completion
2006 E
:= First_Entity
(P
);
2007 while Present
(E
) loop
2009 -- Always ignore child units. Child units get added to the entity
2010 -- list of a parent unit, but are not original entities of the
2011 -- parent, and so do not affect whether the parent needs a body.
2013 if Is_Child_Unit
(E
) then
2016 -- Ignore formal packages and their renamings
2018 elsif Ekind
(E
) = E_Package
2019 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
2020 N_Formal_Package_Declaration
2024 -- Otherwise test to see if entity requires a completion
2026 elsif (Is_Overloadable
(E
)
2027 and then Ekind
(E
) /= E_Enumeration_Literal
2028 and then Ekind
(E
) /= E_Operator
2029 and then not Is_Abstract
(E
)
2030 and then not Has_Completion
(E
))
2033 (Ekind
(E
) = E_Package
2035 and then not Has_Completion
(E
)
2036 and then Unit_Requires_Body
(E
))
2039 (Ekind
(E
) = E_Incomplete_Type
and then No
(Full_View
(E
)))
2042 ((Ekind
(E
) = E_Task_Type
or else
2043 Ekind
(E
) = E_Protected_Type
)
2044 and then not Has_Completion
(E
))
2047 (Ekind
(E
) = E_Generic_Package
and then E
/= P
2048 and then not Has_Completion
(E
)
2049 and then Unit_Requires_Body
(E
))
2052 (Is_Generic_Subprogram
(E
)
2053 and then not Has_Completion
(E
))
2058 -- Entity that does not require completion
2068 end Unit_Requires_Body
;