1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2012, 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 3, 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 COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 -- This package contains the routines to process package specifications and
27 -- bodies. The most important semantic aspects of package processing are the
28 -- handling of private and full declarations, and the construction of dispatch
29 -- tables for tagged types.
31 with Aspects
; use Aspects
;
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_Dist
; use Exp_Dist
;
39 with Exp_Dbug
; use Exp_Dbug
;
41 with Lib
.Xref
; use Lib
.Xref
;
42 with Namet
; use Namet
;
43 with Nmake
; use Nmake
;
44 with Nlists
; use Nlists
;
46 with Output
; use Output
;
47 with Restrict
; use Restrict
;
49 with Sem_Aux
; use Sem_Aux
;
50 with Sem_Cat
; use Sem_Cat
;
51 with Sem_Ch3
; use Sem_Ch3
;
52 with Sem_Ch6
; use Sem_Ch6
;
53 with Sem_Ch8
; use Sem_Ch8
;
54 with Sem_Ch10
; use Sem_Ch10
;
55 with Sem_Ch12
; use Sem_Ch12
;
56 with Sem_Ch13
; use Sem_Ch13
;
57 with Sem_Disp
; use Sem_Disp
;
58 with Sem_Eval
; use Sem_Eval
;
59 with Sem_Util
; use Sem_Util
;
60 with Sem_Warn
; use Sem_Warn
;
61 with Snames
; use Snames
;
62 with Stand
; use Stand
;
63 with Sinfo
; use Sinfo
;
64 with Sinput
; use Sinput
;
66 with Uintp
; use Uintp
;
68 package body Sem_Ch7
is
70 -----------------------------------
71 -- Handling private declarations --
72 -----------------------------------
74 -- The principle that each entity has a single defining occurrence clashes
75 -- with the presence of two separate definitions for private types: the
76 -- first is the private type declaration, and the second is the full type
77 -- declaration. It is important that all references to the type point to
78 -- the same defining occurrence, namely the first one. To enforce the two
79 -- separate views of the entity, the corresponding information is swapped
80 -- between the two declarations. Outside of the package, the defining
81 -- occurrence only contains the private declaration information, while in
82 -- the private part and the body of the package the defining occurrence
83 -- contains the full declaration. To simplify the swap, the defining
84 -- occurrence that currently holds the private declaration points to the
85 -- full declaration. During semantic processing the defining occurrence
86 -- also points to a list of private dependents, that is to say access types
87 -- or composite types whose designated types or component types are
88 -- subtypes or derived types of the private type in question. After the
89 -- full declaration has been seen, the private dependents are updated to
90 -- indicate that they have full definitions.
92 -----------------------
93 -- Local Subprograms --
94 -----------------------
96 procedure Analyze_Package_Body_Helper
(N
: Node_Id
);
97 -- Does all the real work of Analyze_Package_Body
99 procedure Check_Anonymous_Access_Types
100 (Spec_Id
: Entity_Id
;
102 -- If the spec of a package has a limited_with_clause, it may declare
103 -- anonymous access types whose designated type is a limited view, such an
104 -- anonymous access return type for a function. This access type cannot be
105 -- elaborated in the spec itself, but it may need an itype reference if it
106 -- is used within a nested scope. In that case the itype reference is
107 -- created at the beginning of the corresponding package body and inserted
108 -- before other body declarations.
110 procedure Install_Package_Entity
(Id
: Entity_Id
);
111 -- Supporting procedure for Install_{Visible,Private}_Declarations. Places
112 -- one entity on its visibility chain, and recurses on the visible part if
113 -- the entity is an inner package.
115 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
116 -- True for a private type that is not a subtype
118 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
119 -- If the private dependent is a private type whose full view is derived
120 -- from the parent type, its full properties are revealed only if we are in
121 -- the immediate scope of the private dependent. Should this predicate be
122 -- tightened further???
124 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
125 -- Called upon entering the private part of a public child package and the
126 -- body of a nested package, to potentially declare certain inherited
127 -- subprograms that were inherited by types in the visible part, but whose
128 -- declaration was deferred because the parent operation was private and
129 -- not visible at that point. These subprograms are located by traversing
130 -- the visible part declarations looking for non-private type extensions
131 -- and then examining each of the primitive operations of such types to
132 -- find those that were inherited but declared with a special internal
133 -- name. Each such operation is now declared as an operation with a normal
134 -- name (using the name of the parent operation) and replaces the previous
135 -- implicit operation in the primitive operations list of the type. If the
136 -- inherited private operation has been overridden, then it's replaced by
137 -- the overriding operation.
139 --------------------------
140 -- Analyze_Package_Body --
141 --------------------------
143 procedure Analyze_Package_Body
(N
: Node_Id
) is
144 Loc
: constant Source_Ptr
:= Sloc
(N
);
148 Write_Str
("==> package body ");
149 Write_Name
(Chars
(Defining_Entity
(N
)));
150 Write_Str
(" from ");
151 Write_Location
(Loc
);
156 -- The real work is split out into the helper, so it can do "return;"
157 -- without skipping the debug output.
159 Analyze_Package_Body_Helper
(N
);
163 Write_Str
("<== package body ");
164 Write_Name
(Chars
(Defining_Entity
(N
)));
165 Write_Str
(" from ");
166 Write_Location
(Loc
);
169 end Analyze_Package_Body
;
171 ---------------------------------
172 -- Analyze_Package_Body_Helper --
173 ---------------------------------
175 procedure Analyze_Package_Body_Helper
(N
: Node_Id
) is
179 Last_Spec_Entity
: Entity_Id
;
183 procedure Install_Composite_Operations
(P
: Entity_Id
);
184 -- Composite types declared in the current scope may depend on types
185 -- that were private at the point of declaration, and whose full view
186 -- is now in scope. Indicate that the corresponding operations on the
187 -- composite type are available.
189 ----------------------------------
190 -- Install_Composite_Operations --
191 ----------------------------------
193 procedure Install_Composite_Operations
(P
: Entity_Id
) is
197 Id
:= First_Entity
(P
);
198 while Present
(Id
) loop
200 and then (Is_Limited_Composite
(Id
)
201 or else Is_Private_Composite
(Id
))
202 and then No
(Private_Component
(Id
))
204 Set_Is_Limited_Composite
(Id
, False);
205 Set_Is_Private_Composite
(Id
, False);
210 end Install_Composite_Operations
;
212 -- Start of processing for Analyze_Package_Body_Helper
215 -- Find corresponding package specification, and establish the current
216 -- scope. The visible defining entity for the package is the defining
217 -- occurrence in the spec. On exit from the package body, all body
218 -- declarations are attached to the defining entity for the body, but
219 -- the later is never used for name resolution. In this fashion there
220 -- is only one visible entity that denotes the package.
222 -- Set Body_Id. Note that this Will be reset to point to the generic
223 -- copy later on in the generic case.
225 Body_Id
:= Defining_Entity
(N
);
227 if Present
(Corresponding_Spec
(N
)) then
229 -- Body is body of package instantiation. Corresponding spec has
232 Spec_Id
:= Corresponding_Spec
(N
);
233 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
236 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
239 and then Is_Package_Or_Generic_Package
(Spec_Id
)
241 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
243 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
244 Error_Msg_N
("cannot supply body for package renaming", N
);
247 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
248 Error_Msg_N
("redefinition of package body", N
);
253 Error_Msg_N
("missing specification for package body", N
);
257 if Is_Package_Or_Generic_Package
(Spec_Id
)
258 and then (Scope
(Spec_Id
) = Standard_Standard
259 or else Is_Child_Unit
(Spec_Id
))
260 and then not Unit_Requires_Body
(Spec_Id
)
262 if Ada_Version
= Ada_83
then
264 ("optional package body (not allowed in Ada 95)?", N
);
266 Error_Msg_N
("spec of this package does not allow a body", N
);
271 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
272 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
274 if Is_Child_Unit
(Spec_Id
) then
275 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
277 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
280 Set_Is_Child_Unit
(Body_Id
);
283 -- Generic package case
285 if Ekind
(Spec_Id
) = E_Generic_Package
then
287 -- Disable expansion and perform semantic analysis on copy. The
288 -- unannotated body will be used in all instantiations.
290 Body_Id
:= Defining_Entity
(N
);
291 Set_Ekind
(Body_Id
, E_Package_Body
);
292 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
293 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
294 Set_Body_Entity
(Spec_Id
, Body_Id
);
295 Set_Spec_Entity
(Body_Id
, Spec_Id
);
297 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
300 -- Update Body_Id to point to the copied node for the remainder of
303 Body_Id
:= Defining_Entity
(N
);
307 -- The Body_Id is that of the copied node in the generic case, the
308 -- current node otherwise. Note that N was rewritten above, so we must
309 -- be sure to get the latest Body_Id value.
311 Set_Ekind
(Body_Id
, E_Package_Body
);
312 Set_Body_Entity
(Spec_Id
, Body_Id
);
313 Set_Spec_Entity
(Body_Id
, Spec_Id
);
315 -- Defining name for the package body is not a visible entity: Only the
316 -- defining name for the declaration is visible.
318 Set_Etype
(Body_Id
, Standard_Void_Type
);
319 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
320 Set_Corresponding_Spec
(N
, Spec_Id
);
321 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
323 -- The body entity is not used for semantics or code generation, but
324 -- it is attached to the entity list of the enclosing scope to simplify
325 -- the listing of back-annotations for the types it main contain.
327 if Scope
(Spec_Id
) /= Standard_Standard
then
328 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
331 -- Indicate that we are currently compiling the body of the package
333 Set_In_Package_Body
(Spec_Id
);
334 Set_Has_Completion
(Spec_Id
);
335 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
337 Push_Scope
(Spec_Id
);
339 Set_Categorization_From_Pragmas
(N
);
341 Install_Visible_Declarations
(Spec_Id
);
342 Install_Private_Declarations
(Spec_Id
);
343 Install_Private_With_Clauses
(Spec_Id
);
344 Install_Composite_Operations
(Spec_Id
);
346 Check_Anonymous_Access_Types
(Spec_Id
, N
);
348 if Ekind
(Spec_Id
) = E_Generic_Package
then
349 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
352 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
353 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
355 -- This is a nested package, so it may be necessary to declare certain
356 -- inherited subprograms that are not yet visible because the parent
357 -- type's subprograms are now visible.
359 if Ekind
(Scope
(Spec_Id
)) = E_Package
360 and then Scope
(Spec_Id
) /= Standard_Standard
362 Declare_Inherited_Private_Subprograms
(Spec_Id
);
365 if Present
(Declarations
(N
)) then
366 Analyze_Declarations
(Declarations
(N
));
367 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
370 -- Analyze_Declarations has caused freezing of all types. Now generate
371 -- bodies for RACW primitives and stream attributes, if any.
373 if Ekind
(Spec_Id
) = E_Package
and then Has_RACW
(Spec_Id
) then
375 -- Attach subprogram bodies to support RACWs declared in spec
377 Append_RACW_Bodies
(Declarations
(N
), Spec_Id
);
378 Analyze_List
(Declarations
(N
));
381 HSS
:= Handled_Statement_Sequence
(N
);
383 if Present
(HSS
) then
384 Process_End_Label
(HSS
, 't', Spec_Id
);
387 -- Check that elaboration code in a preelaborable package body is
388 -- empty other than null statements and labels (RM 10.2.1(6)).
390 Validate_Null_Statement_Sequence
(N
);
393 Validate_Categorization_Dependency
(N
, Spec_Id
);
394 Check_Completion
(Body_Id
);
396 -- Generate start of body reference. Note that we do this fairly late,
397 -- because the call will use In_Extended_Main_Source_Unit as a check,
398 -- and we want to make sure that Corresponding_Stub links are set
400 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
402 -- For a generic package, collect global references and mark them on
403 -- the original body so that they are not resolved again at the point
406 if Ekind
(Spec_Id
) /= E_Package
then
407 Save_Global_References
(Original_Node
(N
));
411 -- The entities of the package body have so far been chained onto the
412 -- declaration chain for the spec. That's been fine while we were in the
413 -- body, since we wanted them to be visible, but now that we are leaving
414 -- the package body, they are no longer visible, so we remove them from
415 -- the entity chain of the package spec entity, and copy them to the
416 -- entity chain of the package body entity, where they will never again
419 if Present
(Last_Spec_Entity
) then
420 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
421 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
422 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
423 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
426 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
427 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
428 Set_First_Entity
(Spec_Id
, Empty
);
429 Set_Last_Entity
(Spec_Id
, Empty
);
432 End_Package_Scope
(Spec_Id
);
434 -- All entities declared in body are not visible
440 E
:= First_Entity
(Body_Id
);
441 while Present
(E
) loop
442 Set_Is_Immediately_Visible
(E
, False);
443 Set_Is_Potentially_Use_Visible
(E
, False);
446 -- Child units may appear on the entity list (e.g. if they appear
447 -- in the context of a subunit) but they are not body entities.
449 if not Is_Child_Unit
(E
) then
450 Set_Is_Package_Body_Entity
(E
);
457 Check_References
(Body_Id
);
459 -- For a generic unit, check that the formal parameters are referenced,
460 -- and that local variables are used, as for regular packages.
462 if Ekind
(Spec_Id
) = E_Generic_Package
then
463 Check_References
(Spec_Id
);
466 -- The processing so far has made all entities of the package body
467 -- public (i.e. externally visible to the linker). This is in general
468 -- necessary, since inlined or generic bodies, for which code is
469 -- generated in other units, may need to see these entities. The
470 -- following loop runs backwards from the end of the entities of the
471 -- package body making these entities invisible until we reach a
472 -- referencer, i.e. a declaration that could reference a previous
473 -- declaration, a generic body or an inlined body, or a stub (which may
474 -- contain either of these). This is of course an approximation, but it
475 -- is conservative and definitely correct.
477 -- We only do this at the outer (library) level non-generic packages.
478 -- The reason is simply to cut down on the number of global symbols
479 -- generated, which has a double effect: (1) to make the compilation
480 -- process more efficient and (2) to give the code generator more
481 -- freedom to optimize within each unit, especially subprograms.
483 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
484 and then not Is_Generic_Unit
(Spec_Id
)
485 and then Present
(Declarations
(N
))
487 Make_Non_Public_Where_Possible
: declare
489 function Has_Referencer
491 Outer
: Boolean) return Boolean;
492 -- Traverse the given list of declarations in reverse order.
493 -- Return True if a referencer is present. Return False if none is
494 -- found. The Outer parameter is True for the outer level call and
495 -- False for inner level calls for nested packages. If Outer is
496 -- True, then any entities up to the point of hitting a referencer
497 -- get their Is_Public flag cleared, so that the entities will be
498 -- treated as static entities in the C sense, and need not have
499 -- fully qualified names. Furthermore, if the referencer is an
500 -- inlined subprogram that doesn't reference other subprograms,
501 -- we keep clearing the Is_Public flag on subprograms. For inner
502 -- levels, we need all names to be fully qualified to deal with
503 -- the same name appearing in parallel packages (right now this
504 -- is tied to their being external).
510 function Has_Referencer
512 Outer
: Boolean) return Boolean
514 Has_Referencer_Except_For_Subprograms
: Boolean := False;
521 function Check_Subprogram_Ref
(N
: Node_Id
)
522 return Traverse_Result
;
523 -- Look for references to subprograms
525 --------------------------
526 -- Check_Subprogram_Ref --
527 --------------------------
529 function Check_Subprogram_Ref
(N
: Node_Id
)
530 return Traverse_Result
535 -- Check name of procedure or function calls
537 if Nkind
(N
) in N_Subprogram_Call
538 and then Is_Entity_Name
(Name
(N
))
543 -- Check prefix of attribute references
545 if Nkind
(N
) = N_Attribute_Reference
546 and then Is_Entity_Name
(Prefix
(N
))
547 and then Present
(Entity
(Prefix
(N
)))
548 and then Ekind
(Entity
(Prefix
(N
))) in Subprogram_Kind
553 -- Check value of constants
555 if Nkind
(N
) = N_Identifier
556 and then Present
(Entity
(N
))
557 and then Ekind
(Entity
(N
)) = E_Constant
559 V
:= Constant_Value
(Entity
(N
));
561 and then not Compile_Time_Known_Value_Or_Aggr
(V
)
568 end Check_Subprogram_Ref
;
570 function Check_Subprogram_Refs
is
571 new Traverse_Func
(Check_Subprogram_Ref
);
573 -- Start of processing for Has_Referencer
581 while Present
(D
) loop
584 if K
in N_Body_Stub
then
587 -- Processing for subprogram bodies
589 elsif K
= N_Subprogram_Body
then
590 if Acts_As_Spec
(D
) then
591 E
:= Defining_Entity
(D
);
593 -- An inlined body acts as a referencer. Note also
594 -- that we never reset Is_Public for an inlined
595 -- subprogram. Gigi requires Is_Public to be set.
597 -- Note that we test Has_Pragma_Inline here rather
598 -- than Is_Inlined. We are compiling this for a
599 -- client, and it is the client who will decide if
600 -- actual inlining should occur, so we need to assume
601 -- that the procedure could be inlined for the purpose
602 -- of accessing global entities.
604 if Has_Pragma_Inline
(E
) then
606 and then Check_Subprogram_Refs
(D
) = OK
608 Has_Referencer_Except_For_Subprograms
:= True;
613 Set_Is_Public
(E
, False);
617 E
:= Corresponding_Spec
(D
);
621 -- A generic subprogram body acts as a referencer
623 if Is_Generic_Unit
(E
) then
627 if Has_Pragma_Inline
(E
) or else Is_Inlined
(E
) then
629 and then Check_Subprogram_Refs
(D
) = OK
631 Has_Referencer_Except_For_Subprograms
:= True;
639 -- Processing for package bodies
641 elsif K
= N_Package_Body
642 and then Present
(Corresponding_Spec
(D
))
644 E
:= Corresponding_Spec
(D
);
646 -- Generic package body is a referencer. It would seem
647 -- that we only have to consider generics that can be
648 -- exported, i.e. where the corresponding spec is the
649 -- spec of the current package, but because of nested
650 -- instantiations, a fully private generic body may
651 -- export other private body entities. Furthermore,
652 -- regardless of whether there was a previous inlined
653 -- subprogram, (an instantiation of) the generic package
654 -- may reference any entity declared before it.
656 if Is_Generic_Unit
(E
) then
659 -- For non-generic package body, recurse into body unless
660 -- this is an instance, we ignore instances since they
661 -- cannot have references that affect outer entities.
663 elsif not Is_Generic_Instance
(E
)
664 and then not Has_Referencer_Except_For_Subprograms
667 (Declarations
(D
), Outer
=> False)
673 -- Processing for package specs, recurse into declarations.
674 -- Again we skip this for the case of generic instances.
676 elsif K
= N_Package_Declaration
677 and then not Has_Referencer_Except_For_Subprograms
679 S
:= Specification
(D
);
681 if not Is_Generic_Unit
(Defining_Entity
(S
)) then
683 (Private_Declarations
(S
), Outer
=> False)
687 (Visible_Declarations
(S
), Outer
=> False)
693 -- Objects and exceptions need not be public if we have not
694 -- encountered a referencer so far. We only reset the flag
695 -- for outer level entities that are not imported/exported,
696 -- and which have no interface name.
698 elsif Nkind_In
(K
, N_Object_Declaration
,
699 N_Exception_Declaration
,
700 N_Subprogram_Declaration
)
702 E
:= Defining_Entity
(D
);
705 and then (not Has_Referencer_Except_For_Subprograms
706 or else K
= N_Subprogram_Declaration
)
707 and then not Is_Imported
(E
)
708 and then not Is_Exported
(E
)
709 and then No
(Interface_Name
(E
))
711 Set_Is_Public
(E
, False);
718 return Has_Referencer_Except_For_Subprograms
;
721 -- Start of processing for Make_Non_Public_Where_Possible
726 pragma Warnings
(Off
, Discard
);
729 Discard
:= Has_Referencer
(Declarations
(N
), Outer
=> True);
731 end Make_Non_Public_Where_Possible
;
734 -- If expander is not active, then here is where we turn off the
735 -- In_Package_Body flag, otherwise it is turned off at the end of the
736 -- corresponding expansion routine. If this is an instance body, we need
737 -- to qualify names of local entities, because the body may have been
738 -- compiled as a preliminary to another instantiation.
740 if not Expander_Active
then
741 Set_In_Package_Body
(Spec_Id
, False);
743 if Is_Generic_Instance
(Spec_Id
)
744 and then Operating_Mode
= Generate_Code
746 Qualify_Entity_Names
(N
);
749 end Analyze_Package_Body_Helper
;
751 ---------------------------------
752 -- Analyze_Package_Declaration --
753 ---------------------------------
755 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
756 Id
: constant Node_Id
:= Defining_Entity
(N
);
759 -- True when in the context of a declared pure library unit
761 Body_Required
: Boolean;
762 -- True when this package declaration requires a corresponding body
765 -- True when this package declaration is not a nested declaration
768 -- Analye aspect specifications immediately, since we need to recognize
769 -- things like Pure early enough to diagnose violations during analysis.
771 if Has_Aspects
(N
) then
772 Analyze_Aspect_Specifications
(N
, Id
);
775 -- Ada 2005 (AI-217): Check if the package has been erroneously named
776 -- in a limited-with clause of its own context. In this case the error
777 -- has been previously notified by Analyze_Context.
779 -- limited with Pkg; -- ERROR
780 -- package Pkg is ...
782 if From_With_Type
(Id
) then
787 Write_Str
("==> package spec ");
788 Write_Name
(Chars
(Id
));
789 Write_Str
(" from ");
790 Write_Location
(Sloc
(N
));
795 Generate_Definition
(Id
);
797 Set_Ekind
(Id
, E_Package
);
798 Set_Etype
(Id
, Standard_Void_Type
);
802 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
803 Set_Is_Pure
(Id
, PF
);
805 Set_Categorization_From_Pragmas
(N
);
807 Analyze
(Specification
(N
));
808 Validate_Categorization_Dependency
(N
, Id
);
810 Body_Required
:= Unit_Requires_Body
(Id
);
812 -- When this spec does not require an explicit body, we know that there
813 -- are no entities requiring completion in the language sense; we call
814 -- Check_Completion here only to ensure that any nested package
815 -- declaration that requires an implicit body gets one. (In the case
816 -- where a body is required, Check_Completion is called at the end of
817 -- the body's declarative part.)
819 if not Body_Required
then
823 Comp_Unit
:= Nkind
(Parent
(N
)) = N_Compilation_Unit
;
826 -- Set Body_Required indication on the compilation unit node, and
827 -- determine whether elaboration warnings may be meaningful on it.
829 Set_Body_Required
(Parent
(N
), Body_Required
);
831 if not Body_Required
then
832 Set_Suppress_Elaboration_Warnings
(Id
);
837 End_Package_Scope
(Id
);
839 -- For the declaration of a library unit that is a remote types package,
840 -- check legality rules regarding availability of stream attributes for
841 -- types that contain non-remote access values. This subprogram performs
842 -- visibility tests that rely on the fact that we have exited the scope
846 Validate_RT_RAT_Component
(N
);
851 Write_Str
("<== package spec ");
852 Write_Name
(Chars
(Id
));
853 Write_Str
(" from ");
854 Write_Location
(Sloc
(N
));
857 end Analyze_Package_Declaration
;
859 -----------------------------------
860 -- Analyze_Package_Specification --
861 -----------------------------------
863 -- Note that this code is shared for the analysis of generic package specs
864 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
866 procedure Analyze_Package_Specification
(N
: Node_Id
) is
867 Id
: constant Entity_Id
:= Defining_Entity
(N
);
868 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
869 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
870 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
873 Public_Child
: Boolean;
875 Private_With_Clauses_Installed
: Boolean := False;
876 -- In Ada 2005, private with_clauses are visible in the private part
877 -- of a nested package, even if it appears in the public part of the
878 -- enclosing package. This requires a separate step to install these
879 -- private_with_clauses, and remove them at the end of the nested
882 procedure Check_One_Tagged_Type_Or_Extension_At_Most
;
883 -- Issue an error in SPARK mode if a package specification contains
884 -- more than one tagged type or type extension.
886 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
887 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
888 -- Is_True_Constant) on all variables that are entities of Id, and on
889 -- the chain whose first element is FE. A recursive call is made for all
890 -- packages and generic packages.
892 procedure Generate_Parent_References
;
893 -- For a child unit, generate references to parent units, for
894 -- GPS navigation purposes.
896 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
897 -- Child and Unit are entities of compilation units. True if Child
898 -- is a public child of Parent as defined in 10.1.1
900 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
901 -- Reject completion of an incomplete or private type declarations
902 -- having a known discriminant part by an unchecked union.
904 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
905 -- Given the package entity of a generic package instantiation or
906 -- formal package whose corresponding generic is a child unit, installs
907 -- the private declarations of each of the child unit's parents.
908 -- This has to be done at the point of entering the instance package's
909 -- private part rather than being done in Sem_Ch12.Install_Parent
910 -- (which is where the parents' visible declarations are installed).
912 ------------------------------------------------
913 -- Check_One_Tagged_Type_Or_Extension_At_Most --
914 ------------------------------------------------
916 procedure Check_One_Tagged_Type_Or_Extension_At_Most
is
919 procedure Check_Decls
(Decls
: List_Id
);
920 -- Check that either Previous is Empty and Decls does not contain
921 -- more than one tagged type or type extension, or Previous is
922 -- already set and Decls contains no tagged type or type extension.
928 procedure Check_Decls
(Decls
: List_Id
) is
932 Decl
:= First
(Decls
);
933 while Present
(Decl
) loop
934 if Nkind
(Decl
) = N_Full_Type_Declaration
935 and then Is_Tagged_Type
(Defining_Identifier
(Decl
))
937 if No
(Previous
) then
941 Error_Msg_Sloc
:= Sloc
(Previous
);
942 Check_SPARK_Restriction
943 ("at most one tagged type or type extension allowed",
944 "\\ previous declaration#",
953 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
957 Check_Decls
(Vis_Decls
);
959 if Present
(Priv_Decls
) then
960 Check_Decls
(Priv_Decls
);
962 end Check_One_Tagged_Type_Or_Extension_At_Most
;
964 ---------------------
965 -- Clear_Constants --
966 ---------------------
968 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
972 -- Ignore package renamings, not interesting and they can cause self
973 -- referential loops in the code below.
975 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
979 -- Note: in the loop below, the check for Next_Entity pointing back
980 -- to the package entity may seem odd, but it is needed, because a
981 -- package can contain a renaming declaration to itself, and such
982 -- renamings are generated automatically within package instances.
985 while Present
(E
) and then E
/= Id
loop
986 if Is_Assignable
(E
) then
987 Set_Never_Set_In_Source
(E
, False);
988 Set_Is_True_Constant
(E
, False);
989 Set_Current_Value
(E
, Empty
);
990 Set_Is_Known_Null
(E
, False);
991 Set_Last_Assignment
(E
, Empty
);
993 if not Can_Never_Be_Null
(E
) then
994 Set_Is_Known_Non_Null
(E
, False);
997 elsif Is_Package_Or_Generic_Package
(E
) then
998 Clear_Constants
(E
, First_Entity
(E
));
999 Clear_Constants
(E
, First_Private_Entity
(E
));
1004 end Clear_Constants
;
1006 --------------------------------
1007 -- Generate_Parent_References --
1008 --------------------------------
1010 procedure Generate_Parent_References
is
1011 Decl
: constant Node_Id
:= Parent
(N
);
1014 if Id
= Cunit_Entity
(Main_Unit
)
1015 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
1017 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1019 elsif not Nkind_In
(Unit
(Cunit
(Main_Unit
)), N_Subprogram_Body
,
1022 -- If current unit is an ancestor of main unit, generate a
1023 -- reference to its own parent.
1027 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
1030 if Nkind
(Main_Spec
) = N_Package_Body
then
1031 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
1034 U
:= Parent_Spec
(Main_Spec
);
1035 while Present
(U
) loop
1036 if U
= Parent
(Decl
) then
1037 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1040 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
1044 U
:= Parent_Spec
(Unit
(U
));
1049 end Generate_Parent_References
;
1051 ---------------------
1052 -- Is_Public_Child --
1053 ---------------------
1055 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
1057 if not Is_Private_Descendant
(Child
) then
1060 if Child
= Unit
then
1061 return not Private_Present
(
1062 Parent
(Unit_Declaration_Node
(Child
)));
1064 return Is_Public_Child
(Scope
(Child
), Unit
);
1067 end Is_Public_Child
;
1069 ----------------------------------------
1070 -- Inspect_Unchecked_Union_Completion --
1071 ----------------------------------------
1073 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
1077 Decl
:= First
(Decls
);
1078 while Present
(Decl
) loop
1080 -- We are looking at an incomplete or private type declaration
1081 -- with a known_discriminant_part whose full view is an
1084 if Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
1085 N_Private_Type_Declaration
)
1086 and then Has_Discriminants
(Defining_Identifier
(Decl
))
1087 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
1089 Is_Unchecked_Union
(Full_View
(Defining_Identifier
(Decl
)))
1092 ("completion of discriminated partial view "
1093 & "cannot be an unchecked union",
1094 Full_View
(Defining_Identifier
(Decl
)));
1099 end Inspect_Unchecked_Union_Completion
;
1101 -----------------------------------------
1102 -- Install_Parent_Private_Declarations --
1103 -----------------------------------------
1105 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
1106 Inst_Par
: Entity_Id
;
1107 Gen_Par
: Entity_Id
;
1108 Inst_Node
: Node_Id
;
1111 Inst_Par
:= Inst_Id
;
1114 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
1115 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
1116 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
1118 if Nkind_In
(Inst_Node
, N_Package_Instantiation
,
1119 N_Formal_Package_Declaration
)
1120 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
1122 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
1124 if Present
(Renamed_Entity
(Inst_Par
)) then
1125 Inst_Par
:= Renamed_Entity
(Inst_Par
);
1130 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
1132 -- Install the private declarations and private use clauses
1133 -- of a parent instance of the child instance, unless the
1134 -- parent instance private declarations have already been
1135 -- installed earlier in Analyze_Package_Specification, which
1136 -- happens when a generic child is instantiated, and the
1137 -- instance is a child of the parent instance.
1139 -- Installing the use clauses of the parent instance twice
1140 -- is both unnecessary and wrong, because it would cause the
1141 -- clauses to be chained to themselves in the use clauses
1142 -- list of the scope stack entry. That in turn would cause
1143 -- an endless loop from End_Use_Clauses upon scope exit.
1145 -- The parent is now fully visible. It may be a hidden open
1146 -- scope if we are currently compiling some child instance
1147 -- declared within it, but while the current instance is being
1148 -- compiled the parent is immediately visible. In particular
1149 -- its entities must remain visible if a stack save/restore
1150 -- takes place through a call to Rtsfind.
1152 if Present
(Gen_Par
) then
1153 if not In_Private_Part
(Inst_Par
) then
1154 Install_Private_Declarations
(Inst_Par
);
1155 Set_Use
(Private_Declarations
1157 (Unit_Declaration_Node
(Inst_Par
))));
1158 Set_Is_Hidden_Open_Scope
(Inst_Par
, False);
1161 -- If we've reached the end of the generic instance parents,
1162 -- then finish off by looping through the nongeneric parents
1163 -- and installing their private declarations.
1166 while Present
(Inst_Par
)
1167 and then Inst_Par
/= Standard_Standard
1168 and then (not In_Open_Scopes
(Inst_Par
)
1169 or else not In_Private_Part
(Inst_Par
))
1171 Install_Private_Declarations
(Inst_Par
);
1172 Set_Use
(Private_Declarations
1174 (Unit_Declaration_Node
(Inst_Par
))));
1175 Inst_Par
:= Scope
(Inst_Par
);
1185 end Install_Parent_Private_Declarations
;
1187 -- Start of processing for Analyze_Package_Specification
1190 if Present
(Vis_Decls
) then
1191 Analyze_Declarations
(Vis_Decls
);
1194 -- Verify that incomplete types have received full declarations and
1195 -- also build invariant procedures for any types with invariants.
1197 E
:= First_Entity
(Id
);
1198 while Present
(E
) loop
1200 -- Check on incomplete types
1202 -- AI05-0213: A formal incomplete type has no completion
1204 if Ekind
(E
) = E_Incomplete_Type
1205 and then No
(Full_View
(E
))
1206 and then not Is_Generic_Type
(E
)
1208 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
1211 -- Build invariant procedures
1213 if Is_Type
(E
) and then Has_Invariants
(E
) then
1214 Build_Invariant_Procedure
(E
, N
);
1220 if Is_Remote_Call_Interface
(Id
)
1221 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
1223 Validate_RCI_Declarations
(Id
);
1226 -- Save global references in the visible declarations, before installing
1227 -- private declarations of parent unit if there is one, because the
1228 -- privacy status of types defined in the parent will change. This is
1229 -- only relevant for generic child units, but is done in all cases for
1232 if Ekind
(Id
) = E_Generic_Package
1233 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1236 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1237 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1239 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1240 Save_Global_References
(Orig_Decl
);
1241 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1245 -- If package is a public child unit, then make the private declarations
1246 -- of the parent visible.
1248 Public_Child
:= False;
1252 Pack_Decl
: Node_Id
;
1257 Par_Spec
:= Parent_Spec
(Parent
(N
));
1259 -- If the package is formal package of an enclosing generic, it is
1260 -- transformed into a local generic declaration, and compiled to make
1261 -- its spec available. We need to retrieve the original generic to
1262 -- determine whether it is a child unit, and install its parents.
1266 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1268 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1269 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1272 if Present
(Par_Spec
) then
1273 Generate_Parent_References
;
1275 while Scope
(Par
) /= Standard_Standard
1276 and then Is_Public_Child
(Id
, Par
)
1277 and then In_Open_Scopes
(Par
)
1279 Public_Child
:= True;
1281 Install_Private_Declarations
(Par
);
1282 Install_Private_With_Clauses
(Par
);
1283 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1284 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1289 if Is_Compilation_Unit
(Id
) then
1290 Install_Private_With_Clauses
(Id
);
1293 -- The current compilation unit may include private with_clauses,
1294 -- which are visible in the private part of the current nested
1295 -- package, and have to be installed now. This is not done for
1296 -- nested instantiations, where the private with_clauses of the
1297 -- enclosing unit have no effect once the instantiation info is
1298 -- established and we start analyzing the package declaration.
1301 Comp_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
1303 if Is_Package_Or_Generic_Package
(Comp_Unit
)
1304 and then not In_Private_Part
(Comp_Unit
)
1305 and then not In_Instance
1307 Install_Private_With_Clauses
(Comp_Unit
);
1308 Private_With_Clauses_Installed
:= True;
1313 -- If this is a package associated with a generic instance or formal
1314 -- package, then the private declarations of each of the generic's
1315 -- parents must be installed at this point.
1317 if Is_Generic_Instance
(Id
) then
1318 Install_Parent_Private_Declarations
(Id
);
1321 -- Analyze private part if present. The flag In_Private_Part is reset
1322 -- in End_Package_Scope.
1324 L
:= Last_Entity
(Id
);
1326 if Present
(Priv_Decls
) then
1327 Set_In_Private_Part
(Id
);
1329 -- Upon entering a public child's private part, it may be necessary
1330 -- to declare subprograms that were derived in the package's visible
1331 -- part but not yet made visible.
1333 if Public_Child
then
1334 Declare_Inherited_Private_Subprograms
(Id
);
1337 Analyze_Declarations
(Priv_Decls
);
1339 -- Check the private declarations for incomplete deferred constants
1341 Inspect_Deferred_Constant_Completion
(Priv_Decls
);
1343 -- The first private entity is the immediate follower of the last
1344 -- visible entity, if there was one.
1347 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1349 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
1352 -- There may be inherited private subprograms that need to be declared,
1353 -- even in the absence of an explicit private part. If there are any
1354 -- public declarations in the package and the package is a public child
1355 -- unit, then an implicit private part is assumed.
1357 elsif Present
(L
) and then Public_Child
then
1358 Set_In_Private_Part
(Id
);
1359 Declare_Inherited_Private_Subprograms
(Id
);
1360 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1363 E
:= First_Entity
(Id
);
1364 while Present
(E
) loop
1366 -- Check rule of 3.6(11), which in general requires waiting till all
1367 -- full types have been seen.
1369 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1370 Check_Aliased_Component_Types
(E
);
1373 -- Check preelaborable initialization for full type completing a
1374 -- private type for which pragma Preelaborable_Initialization given.
1377 and then Must_Have_Preelab_Init
(E
)
1378 and then not Has_Preelaborable_Initialization
(E
)
1381 ("full view of & does not have preelaborable initialization", E
);
1384 -- An invariant may appear on a full view of a type
1387 and then Has_Private_Declaration
(E
)
1388 and then Nkind
(Parent
(E
)) = N_Full_Type_Declaration
1389 and then Has_Aspects
(Parent
(E
))
1395 ASN
:= First
(Aspect_Specifications
(Parent
(E
)));
1396 while Present
(ASN
) loop
1397 if Chars
(Identifier
(ASN
)) = Name_Invariant
1399 Chars
(Identifier
(ASN
)) = Name_Type_Invariant
1401 Build_Invariant_Procedure
(E
, N
);
1413 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1414 -- declaration having a known_discriminant_part shall not be an
1415 -- unchecked union type.
1417 if Present
(Vis_Decls
) then
1418 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1421 if Present
(Priv_Decls
) then
1422 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1425 if Ekind
(Id
) = E_Generic_Package
1426 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1427 and then Present
(Priv_Decls
)
1429 -- Save global references in private declarations, ignoring the
1430 -- visible declarations that were processed earlier.
1433 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1434 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1435 Save_Form
: constant List_Id
:=
1436 Generic_Formal_Declarations
(Orig_Decl
);
1439 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1440 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1441 Save_Global_References
(Orig_Decl
);
1442 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1443 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1447 Process_End_Label
(N
, 'e', Id
);
1449 -- Remove private_with_clauses of enclosing compilation unit, if they
1452 if Private_With_Clauses_Installed
then
1453 Remove_Private_With_Clauses
(Cunit
(Current_Sem_Unit
));
1456 -- For the case of a library level package, we must go through all the
1457 -- entities clearing the indications that the value may be constant and
1458 -- not modified. Why? Because any client of this package may modify
1459 -- these values freely from anywhere. This also applies to any nested
1460 -- packages or generic packages.
1462 -- For now we unconditionally clear constants for packages that are
1463 -- instances of generic packages. The reason is that we do not have the
1464 -- body yet, and we otherwise think things are unreferenced when they
1465 -- are not. This should be fixed sometime (the effect is not terrible,
1466 -- we just lose some warnings, and also some cases of value propagation)
1469 if Is_Library_Level_Entity
(Id
)
1470 or else Is_Generic_Instance
(Id
)
1472 Clear_Constants
(Id
, First_Entity
(Id
));
1473 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1476 Check_One_Tagged_Type_Or_Extension_At_Most
;
1477 end Analyze_Package_Specification
;
1479 --------------------------------------
1480 -- Analyze_Private_Type_Declaration --
1481 --------------------------------------
1483 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1484 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1485 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1488 Generate_Definition
(Id
);
1489 Set_Is_Pure
(Id
, PF
);
1490 Init_Size_Align
(Id
);
1492 if not Is_Package_Or_Generic_Package
(Current_Scope
)
1493 or else In_Private_Part
(Current_Scope
)
1495 Error_Msg_N
("invalid context for private declaration", N
);
1498 New_Private_Type
(N
, Id
, N
);
1499 Set_Depends_On_Private
(Id
);
1501 if Has_Aspects
(N
) then
1502 Analyze_Aspect_Specifications
(N
, Id
);
1504 end Analyze_Private_Type_Declaration
;
1506 ----------------------------------
1507 -- Check_Anonymous_Access_Types --
1508 ----------------------------------
1510 procedure Check_Anonymous_Access_Types
1511 (Spec_Id
: Entity_Id
;
1518 -- Itype references are only needed by gigi, to force elaboration of
1519 -- itypes. In the absence of code generation, they are not needed.
1521 if not Expander_Active
then
1525 E
:= First_Entity
(Spec_Id
);
1526 while Present
(E
) loop
1527 if Ekind
(E
) = E_Anonymous_Access_Type
1528 and then From_With_Type
(E
)
1530 IR
:= Make_Itype_Reference
(Sloc
(P_Body
));
1533 if No
(Declarations
(P_Body
)) then
1534 Set_Declarations
(P_Body
, New_List
(IR
));
1536 Prepend
(IR
, Declarations
(P_Body
));
1542 end Check_Anonymous_Access_Types
;
1544 -------------------------------------------
1545 -- Declare_Inherited_Private_Subprograms --
1546 -------------------------------------------
1548 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1550 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1551 -- Check whether an inherited subprogram S is an operation of an
1552 -- untagged derived type T.
1554 ---------------------
1555 -- Is_Primitive_Of --
1556 ---------------------
1558 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1562 -- If the full view is a scalar type, the type is the anonymous base
1563 -- type, but the operation mentions the first subtype, so check the
1564 -- signature against the base type.
1566 if Base_Type
(Etype
(S
)) = Base_Type
(T
) then
1570 Formal
:= First_Formal
(S
);
1571 while Present
(Formal
) loop
1572 if Base_Type
(Etype
(Formal
)) = Base_Type
(T
) then
1576 Next_Formal
(Formal
);
1581 end Is_Primitive_Of
;
1588 Op_Elmt_2
: Elmt_Id
;
1589 Prim_Op
: Entity_Id
;
1590 New_Op
: Entity_Id
:= Empty
;
1591 Parent_Subp
: Entity_Id
;
1594 -- Start of processing for Declare_Inherited_Private_Subprograms
1597 E
:= First_Entity
(Id
);
1598 while Present
(E
) loop
1600 -- If the entity is a nonprivate type extension whose parent type
1601 -- is declared in an open scope, then the type may have inherited
1602 -- operations that now need to be made visible. Ditto if the entity
1603 -- is a formal derived type in a child unit.
1605 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1607 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1608 and then Is_Generic_Type
(E
)))
1609 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1610 and then Is_Base_Type
(E
)
1612 if Is_Tagged_Type
(E
) then
1613 Op_List
:= Primitive_Operations
(E
);
1615 Tag
:= First_Tag_Component
(E
);
1617 Op_Elmt
:= First_Elmt
(Op_List
);
1618 while Present
(Op_Elmt
) loop
1619 Prim_Op
:= Node
(Op_Elmt
);
1621 -- Search primitives that are implicit operations with an
1622 -- internal name whose parent operation has a normal name.
1624 if Present
(Alias
(Prim_Op
))
1625 and then Find_Dispatching_Type
(Alias
(Prim_Op
)) /= E
1626 and then not Comes_From_Source
(Prim_Op
)
1627 and then Is_Internal_Name
(Chars
(Prim_Op
))
1628 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1630 Parent_Subp
:= Alias
(Prim_Op
);
1632 -- Case 1: Check if the type has also an explicit
1633 -- overriding for this primitive.
1635 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1636 while Present
(Op_Elmt_2
) loop
1638 -- Skip entities with attribute Interface_Alias since
1639 -- they are not overriding primitives (these entities
1640 -- link an interface primitive with their covering
1643 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
1644 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
1645 and then No
(Interface_Alias
(Node
(Op_Elmt_2
)))
1647 -- The private inherited operation has been
1648 -- overridden by an explicit subprogram: replace
1649 -- the former by the latter.
1651 New_Op
:= Node
(Op_Elmt_2
);
1652 Replace_Elmt
(Op_Elmt
, New_Op
);
1653 Remove_Elmt
(Op_List
, Op_Elmt_2
);
1654 Set_Overridden_Operation
(New_Op
, Parent_Subp
);
1656 -- We don't need to inherit its dispatching slot.
1657 -- Set_All_DT_Position has previously ensured that
1658 -- the same slot was assigned to the two primitives
1661 and then Present
(DTC_Entity
(New_Op
))
1662 and then Present
(DTC_Entity
(Prim_Op
))
1664 pragma Assert
(DT_Position
(New_Op
)
1665 = DT_Position
(Prim_Op
));
1669 goto Next_Primitive
;
1672 Next_Elmt
(Op_Elmt_2
);
1675 -- Case 2: We have not found any explicit overriding and
1676 -- hence we need to declare the operation (i.e., make it
1679 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1681 -- Inherit the dispatching slot if E is already frozen
1684 and then Present
(DTC_Entity
(Alias
(Prim_Op
)))
1686 Set_DTC_Entity_Value
(E
, New_Op
);
1687 Set_DT_Position
(New_Op
,
1688 DT_Position
(Alias
(Prim_Op
)));
1692 (Is_Dispatching_Operation
(New_Op
)
1693 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
1695 -- Substitute the new operation for the old one in the
1696 -- type's primitive operations list. Since the new
1697 -- operation was also just added to the end of list,
1698 -- the last element must be removed.
1700 -- (Question: is there a simpler way of declaring the
1701 -- operation, say by just replacing the name of the
1702 -- earlier operation, reentering it in the in the symbol
1703 -- table (how?), and marking it as private???)
1705 Replace_Elmt
(Op_Elmt
, New_Op
);
1706 Remove_Last_Elmt
(Op_List
);
1710 Next_Elmt
(Op_Elmt
);
1713 -- Generate listing showing the contents of the dispatch table
1715 if Debug_Flag_ZZ
then
1720 -- Non-tagged type, scan forward to locate inherited hidden
1723 Prim_Op
:= Next_Entity
(E
);
1724 while Present
(Prim_Op
) loop
1725 if Is_Subprogram
(Prim_Op
)
1726 and then Present
(Alias
(Prim_Op
))
1727 and then not Comes_From_Source
(Prim_Op
)
1728 and then Is_Internal_Name
(Chars
(Prim_Op
))
1729 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1730 and then Is_Primitive_Of
(E
, Prim_Op
)
1732 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1735 Next_Entity
(Prim_Op
);
1742 end Declare_Inherited_Private_Subprograms
;
1744 -----------------------
1745 -- End_Package_Scope --
1746 -----------------------
1748 procedure End_Package_Scope
(P
: Entity_Id
) is
1750 Uninstall_Declarations
(P
);
1752 end End_Package_Scope
;
1754 ---------------------------
1755 -- Exchange_Declarations --
1756 ---------------------------
1758 procedure Exchange_Declarations
(Id
: Entity_Id
) is
1759 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
1760 H1
: constant Entity_Id
:= Homonym
(Id
);
1761 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
1766 -- If missing full declaration for type, nothing to exchange
1768 if No
(Full_Id
) then
1772 -- Otherwise complete the exchange, and preserve semantic links
1774 Next2
:= Next_Entity
(Full_Id
);
1775 H2
:= Homonym
(Full_Id
);
1777 -- Reset full declaration pointer to reflect the switched entities and
1778 -- readjust the next entity chains.
1780 Exchange_Entities
(Id
, Full_Id
);
1782 Set_Next_Entity
(Id
, Next1
);
1783 Set_Homonym
(Id
, H1
);
1785 Set_Full_View
(Full_Id
, Id
);
1786 Set_Next_Entity
(Full_Id
, Next2
);
1787 Set_Homonym
(Full_Id
, H2
);
1788 end Exchange_Declarations
;
1790 ----------------------------
1791 -- Install_Package_Entity --
1792 ----------------------------
1794 procedure Install_Package_Entity
(Id
: Entity_Id
) is
1796 if not Is_Internal
(Id
) then
1797 if Debug_Flag_E
then
1798 Write_Str
("Install: ");
1799 Write_Name
(Chars
(Id
));
1803 if not Is_Child_Unit
(Id
) then
1804 Set_Is_Immediately_Visible
(Id
);
1808 end Install_Package_Entity
;
1810 ----------------------------------
1811 -- Install_Private_Declarations --
1812 ----------------------------------
1814 procedure Install_Private_Declarations
(P
: Entity_Id
) is
1816 Priv_Elmt
: Elmt_Id
;
1821 -- First exchange declarations for private types, so that the full
1822 -- declaration is visible. For each private type, we check its
1823 -- Private_Dependents list and also exchange any subtypes of or derived
1824 -- types from it. Finally, if this is a Taft amendment type, the
1825 -- incomplete declaration is irrelevant, and we want to link the
1826 -- eventual full declaration with the original private one so we also
1827 -- skip the exchange.
1829 Id
:= First_Entity
(P
);
1830 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1831 if Is_Private_Base_Type
(Id
)
1832 and then Comes_From_Source
(Full_View
(Id
))
1833 and then Present
(Full_View
(Id
))
1834 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
1835 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
1837 -- If there is a use-type clause on the private type, set the
1838 -- full view accordingly.
1840 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
1841 Full
:= Full_View
(Id
);
1843 if Is_Private_Base_Type
(Full
)
1844 and then Has_Private_Declaration
(Full
)
1845 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
1846 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
1847 and then In_Package_Body
(Current_Scope
)
1848 and then not Is_Private_Type
(Etype
(Full
))
1850 -- This is the completion of a private type by a derivation
1851 -- from another private type which is not private anymore. This
1852 -- can only happen in a package nested within a child package,
1853 -- when the parent type is defined in the parent unit. At this
1854 -- point the current type is not private either, and we have to
1855 -- install the underlying full view, which is now visible. Save
1856 -- the current full view as well, so that all views can be
1857 -- restored on exit. It may seem that after compiling the child
1858 -- body there are not environments to restore, but the back-end
1859 -- expects those links to be valid, and freeze nodes depend on
1862 if No
(Full_View
(Full
))
1863 and then Present
(Underlying_Full_View
(Full
))
1865 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
1866 Set_Underlying_Full_View
(Id
, Full
);
1868 Set_Underlying_Full_View
(Full
, Empty
);
1869 Set_Is_Frozen
(Full_View
(Id
));
1873 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1875 Exchange_Declarations
(Id
);
1876 Set_Is_Immediately_Visible
(Id
);
1878 while Present
(Priv_Elmt
) loop
1879 Priv
:= Node
(Priv_Elmt
);
1881 -- Before the exchange, verify that the presence of the
1882 -- Full_View field. It will be empty if the entity has already
1883 -- been installed due to a previous call.
1885 if Present
(Full_View
(Priv
))
1886 and then Is_Visible_Dependent
(Priv
)
1889 -- For each subtype that is swapped, we also swap the
1890 -- reference to it in Private_Dependents, to allow access
1891 -- to it when we swap them out in End_Package_Scope.
1893 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
1894 Exchange_Declarations
(Priv
);
1895 Set_Is_Immediately_Visible
1896 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
1897 Set_Is_Potentially_Use_Visible
1898 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
1901 Next_Elmt
(Priv_Elmt
);
1908 -- Next make other declarations in the private part visible as well
1910 Id
:= First_Private_Entity
(P
);
1911 while Present
(Id
) loop
1912 Install_Package_Entity
(Id
);
1913 Set_Is_Hidden
(Id
, False);
1917 -- Indicate that the private part is currently visible, so it can be
1918 -- properly reset on exit.
1920 Set_In_Private_Part
(P
);
1921 end Install_Private_Declarations
;
1923 ----------------------------------
1924 -- Install_Visible_Declarations --
1925 ----------------------------------
1927 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
1929 Last_Entity
: Entity_Id
;
1933 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
1935 if Is_Package_Or_Generic_Package
(P
) then
1936 Last_Entity
:= First_Private_Entity
(P
);
1938 Last_Entity
:= Empty
;
1941 Id
:= First_Entity
(P
);
1942 while Present
(Id
) and then Id
/= Last_Entity
loop
1943 Install_Package_Entity
(Id
);
1946 end Install_Visible_Declarations
;
1948 --------------------------
1949 -- Is_Private_Base_Type --
1950 --------------------------
1952 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
1954 return Ekind
(E
) = E_Private_Type
1955 or else Ekind
(E
) = E_Limited_Private_Type
1956 or else Ekind
(E
) = E_Record_Type_With_Private
;
1957 end Is_Private_Base_Type
;
1959 --------------------------
1960 -- Is_Visible_Dependent --
1961 --------------------------
1963 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
1965 S
: constant Entity_Id
:= Scope
(Dep
);
1968 -- Renamings created for actual types have the visibility of the actual
1970 if Ekind
(S
) = E_Package
1971 and then Is_Generic_Instance
(S
)
1972 and then (Is_Generic_Actual_Type
(Dep
)
1973 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
1977 elsif not (Is_Derived_Type
(Dep
))
1978 and then Is_Derived_Type
(Full_View
(Dep
))
1980 -- When instantiating a package body, the scope stack is empty, so
1981 -- check instead whether the dependent type is defined in the same
1982 -- scope as the instance itself.
1984 return In_Open_Scopes
(S
)
1985 or else (Is_Generic_Instance
(Current_Scope
)
1986 and then Scope
(Dep
) = Scope
(Current_Scope
));
1990 end Is_Visible_Dependent
;
1992 ----------------------------
1993 -- May_Need_Implicit_Body --
1994 ----------------------------
1996 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
1997 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
1998 S
: constant Node_Id
:= Parent
(P
);
2003 if not Has_Completion
(E
)
2004 and then Nkind
(P
) = N_Package_Declaration
2005 and then (Present
(Activation_Chain_Entity
(P
)) or else Has_RACW
(E
))
2008 Make_Package_Body
(Sloc
(E
),
2009 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
2010 Chars
=> Chars
(E
)),
2011 Declarations
=> New_List
);
2013 if Nkind
(S
) = N_Package_Specification
then
2014 if Present
(Private_Declarations
(S
)) then
2015 Decls
:= Private_Declarations
(S
);
2017 Decls
:= Visible_Declarations
(S
);
2020 Decls
:= Declarations
(S
);
2026 end May_Need_Implicit_Body
;
2028 ----------------------
2029 -- New_Private_Type --
2030 ----------------------
2032 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
2034 -- For other than Ada 2012, enter the name in the current scope
2036 if Ada_Version
< Ada_2012
then
2039 -- Ada 2012 (AI05-0162): Enter the name in the current scope handling
2040 -- private type that completes an incomplete type.
2046 Prev
:= Find_Type_Name
(N
);
2047 pragma Assert
(Prev
= Id
2048 or else (Ekind
(Prev
) = E_Incomplete_Type
2049 and then Present
(Full_View
(Prev
))
2050 and then Full_View
(Prev
) = Id
));
2054 if Limited_Present
(Def
) then
2055 Set_Ekind
(Id
, E_Limited_Private_Type
);
2057 Set_Ekind
(Id
, E_Private_Type
);
2061 Set_Has_Delayed_Freeze
(Id
);
2062 Set_Is_First_Subtype
(Id
);
2063 Init_Size_Align
(Id
);
2065 Set_Is_Constrained
(Id
,
2066 No
(Discriminant_Specifications
(N
))
2067 and then not Unknown_Discriminants_Present
(N
));
2069 -- Set tagged flag before processing discriminants, to catch illegal
2072 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
2074 Set_Discriminant_Constraint
(Id
, No_Elist
);
2075 Set_Stored_Constraint
(Id
, No_Elist
);
2077 if Present
(Discriminant_Specifications
(N
)) then
2079 Process_Discriminants
(N
);
2082 elsif Unknown_Discriminants_Present
(N
) then
2083 Set_Has_Unknown_Discriminants
(Id
);
2086 Set_Private_Dependents
(Id
, New_Elmt_List
);
2088 if Tagged_Present
(Def
) then
2089 Set_Ekind
(Id
, E_Record_Type_With_Private
);
2090 Set_Direct_Primitive_Operations
(Id
, New_Elmt_List
);
2091 Set_Is_Abstract_Type
(Id
, Abstract_Present
(Def
));
2092 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
2093 Set_Has_Delayed_Freeze
(Id
, True);
2095 -- Create a class-wide type with the same attributes
2097 Make_Class_Wide_Type
(Id
);
2099 elsif Abstract_Present
(Def
) then
2100 Error_Msg_N
("only a tagged type can be abstract", N
);
2102 end New_Private_Type
;
2104 ----------------------------
2105 -- Uninstall_Declarations --
2106 ----------------------------
2108 procedure Uninstall_Declarations
(P
: Entity_Id
) is
2109 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
2112 Priv_Elmt
: Elmt_Id
;
2113 Priv_Sub
: Entity_Id
;
2115 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
2116 -- Copy to the private declaration the attributes of the full view that
2117 -- need to be available for the partial view also.
2119 function Type_In_Use
(T
: Entity_Id
) return Boolean;
2120 -- Check whether type or base type appear in an active use_type clause
2122 ------------------------------
2123 -- Preserve_Full_Attributes --
2124 ------------------------------
2126 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
2127 Priv_Is_Base_Type
: constant Boolean := Is_Base_Type
(Priv
);
2130 Set_Size_Info
(Priv
, (Full
));
2131 Set_RM_Size
(Priv
, RM_Size
(Full
));
2132 Set_Size_Known_At_Compile_Time
2133 (Priv
, Size_Known_At_Compile_Time
(Full
));
2134 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
2135 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
2136 Set_Is_Ada_2005_Only
(Priv
, Is_Ada_2005_Only
(Full
));
2137 Set_Is_Ada_2012_Only
(Priv
, Is_Ada_2012_Only
(Full
));
2138 Set_Has_Pragma_Unmodified
(Priv
, Has_Pragma_Unmodified
(Full
));
2139 Set_Has_Pragma_Unreferenced
(Priv
, Has_Pragma_Unreferenced
(Full
));
2140 Set_Has_Pragma_Unreferenced_Objects
2141 (Priv
, Has_Pragma_Unreferenced_Objects
2143 if Is_Unchecked_Union
(Full
) then
2144 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
2146 -- Why is atomic not copied here ???
2148 if Referenced
(Full
) then
2149 Set_Referenced
(Priv
);
2152 if Priv_Is_Base_Type
then
2153 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
2154 Set_Finalize_Storage_Only
(Priv
, Finalize_Storage_Only
2155 (Base_Type
(Full
)));
2156 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
2157 Set_Has_Controlled_Component
(Priv
, Has_Controlled_Component
2158 (Base_Type
(Full
)));
2161 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
2163 -- Propagate information of type invariants, which may be specified
2164 -- for the full view.
2166 if Has_Invariants
(Full
) and not Has_Invariants
(Priv
) then
2167 Set_Has_Invariants
(Priv
);
2168 Set_Subprograms_For_Type
(Priv
, Subprograms_For_Type
(Full
));
2171 if Is_Tagged_Type
(Priv
)
2172 and then Is_Tagged_Type
(Full
)
2173 and then not Error_Posted
(Full
)
2175 if Is_Tagged_Type
(Priv
) then
2177 -- If the type is tagged, the tag itself must be available on
2178 -- the partial view, for expansion purposes.
2180 Set_First_Entity
(Priv
, First_Entity
(Full
));
2182 -- If there are discriminants in the partial view, these remain
2183 -- visible. Otherwise only the tag itself is visible, and there
2184 -- are no nameable components in the partial view.
2186 if No
(Last_Entity
(Priv
)) then
2187 Set_Last_Entity
(Priv
, First_Entity
(Priv
));
2191 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
2193 if Has_Discriminants
(Full
) then
2194 Set_Discriminant_Constraint
(Priv
,
2195 Discriminant_Constraint
(Full
));
2198 end Preserve_Full_Attributes
;
2204 function Type_In_Use
(T
: Entity_Id
) return Boolean is
2206 return Scope
(Base_Type
(T
)) = P
2207 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
2210 -- Start of processing for Uninstall_Declarations
2213 Id
:= First_Entity
(P
);
2214 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2215 if Debug_Flag_E
then
2216 Write_Str
("unlinking visible entity ");
2217 Write_Int
(Int
(Id
));
2221 -- On exit from the package scope, we must preserve the visibility
2222 -- established by use clauses in the current scope. Two cases:
2224 -- a) If the entity is an operator, it may be a primitive operator of
2225 -- a type for which there is a visible use-type clause.
2227 -- b) for other entities, their use-visibility is determined by a
2228 -- visible use clause for the package itself. For a generic instance,
2229 -- the instantiation of the formals appears in the visible part,
2230 -- but the formals are private and remain so.
2232 if Ekind
(Id
) = E_Function
2233 and then Is_Operator_Symbol_Name
(Chars
(Id
))
2234 and then not Is_Hidden
(Id
)
2235 and then not Error_Posted
(Id
)
2237 Set_Is_Potentially_Use_Visible
(Id
,
2239 or else Type_In_Use
(Etype
(Id
))
2240 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
2241 or else (Present
(Next_Formal
(First_Formal
(Id
)))
2244 (Etype
(Next_Formal
(First_Formal
(Id
))))));
2246 if In_Use
(P
) and then not Is_Hidden
(Id
) then
2248 -- A child unit of a use-visible package remains use-visible
2249 -- only if it is itself a visible child unit. Otherwise it
2250 -- would remain visible in other contexts where P is use-
2251 -- visible, because once compiled it stays in the entity list
2252 -- of its parent unit.
2254 if Is_Child_Unit
(Id
) then
2255 Set_Is_Potentially_Use_Visible
(Id
,
2256 Is_Visible_Child_Unit
(Id
));
2258 Set_Is_Potentially_Use_Visible
(Id
);
2262 Set_Is_Potentially_Use_Visible
(Id
, False);
2266 -- Local entities are not immediately visible outside of the package
2268 Set_Is_Immediately_Visible
(Id
, False);
2270 -- If this is a private type with a full view (for example a local
2271 -- subtype of a private type declared elsewhere), ensure that the
2272 -- full view is also removed from visibility: it may be exposed when
2273 -- swapping views in an instantiation.
2276 and then Present
(Full_View
(Id
))
2278 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
2281 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2282 Check_Abstract_Overriding
(Id
);
2283 Check_Conventions
(Id
);
2286 if (Ekind
(Id
) = E_Private_Type
2287 or else Ekind
(Id
) = E_Limited_Private_Type
)
2288 and then No
(Full_View
(Id
))
2289 and then not Is_Generic_Type
(Id
)
2290 and then not Is_Derived_Type
(Id
)
2292 Error_Msg_N
("missing full declaration for private type&", Id
);
2294 elsif Ekind
(Id
) = E_Record_Type_With_Private
2295 and then not Is_Generic_Type
(Id
)
2296 and then No
(Full_View
(Id
))
2298 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
2299 Error_Msg_N
("missing full declaration for private type&", Id
);
2302 ("missing full declaration for private extension", Id
);
2305 -- Case of constant, check for deferred constant declaration with
2306 -- no full view. Likely just a matter of a missing expression, or
2307 -- accidental use of the keyword constant.
2309 elsif Ekind
(Id
) = E_Constant
2311 -- OK if constant value present
2313 and then No
(Constant_Value
(Id
))
2315 -- OK if full view present
2317 and then No
(Full_View
(Id
))
2319 -- OK if imported, since that provides the completion
2321 and then not Is_Imported
(Id
)
2323 -- OK if object declaration replaced by renaming declaration as
2324 -- a result of OK_To_Rename processing (e.g. for concatenation)
2326 and then Nkind
(Parent
(Id
)) /= N_Object_Renaming_Declaration
2328 -- OK if object declaration with the No_Initialization flag set
2330 and then not (Nkind
(Parent
(Id
)) = N_Object_Declaration
2331 and then No_Initialization
(Parent
(Id
)))
2333 -- If no private declaration is present, we assume the user did
2334 -- not intend a deferred constant declaration and the problem
2335 -- is simply that the initializing expression is missing.
2337 if not Has_Private_Declaration
(Etype
(Id
)) then
2339 -- We assume that the user did not intend a deferred constant
2340 -- declaration, and the expression is just missing.
2343 ("constant declaration requires initialization expression",
2346 if Is_Limited_Type
(Etype
(Id
)) then
2348 ("\if variable intended, remove CONSTANT from declaration",
2352 -- Otherwise if a private declaration is present, then we are
2353 -- missing the full declaration for the deferred constant.
2357 ("missing full declaration for deferred constant (RM 7.4)",
2360 if Is_Limited_Type
(Etype
(Id
)) then
2362 ("\if variable intended, remove CONSTANT from declaration",
2371 -- If the specification was installed as the parent of a public child
2372 -- unit, the private declarations were not installed, and there is
2375 if not In_Private_Part
(P
) then
2378 Set_In_Private_Part
(P
, False);
2381 -- Make private entities invisible and exchange full and private
2382 -- declarations for private types. Id is now the first private entity
2385 while Present
(Id
) loop
2386 if Debug_Flag_E
then
2387 Write_Str
("unlinking private entity ");
2388 Write_Int
(Int
(Id
));
2392 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2393 Check_Abstract_Overriding
(Id
);
2394 Check_Conventions
(Id
);
2397 Set_Is_Immediately_Visible
(Id
, False);
2399 if Is_Private_Base_Type
(Id
)
2400 and then Present
(Full_View
(Id
))
2402 Full
:= Full_View
(Id
);
2404 -- If the partial view is not declared in the visible part of the
2405 -- package (as is the case when it is a type derived from some
2406 -- other private type in the private part of the current package),
2407 -- no exchange takes place.
2410 or else List_Containing
(Parent
(Id
))
2411 /= Visible_Declarations
(Specification
(Decl
))
2416 -- The entry in the private part points to the full declaration,
2417 -- which is currently visible. Exchange them so only the private
2418 -- type declaration remains accessible, and link private and full
2419 -- declaration in the opposite direction. Before the actual
2420 -- exchange, we copy back attributes of the full view that must
2421 -- be available to the partial view too.
2423 Preserve_Full_Attributes
(Id
, Full
);
2425 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
2427 if Is_Indefinite_Subtype
(Full
)
2428 and then not Is_Indefinite_Subtype
(Id
)
2431 ("full view of type must be definite subtype", Full
);
2434 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2436 -- Swap out the subtypes and derived types of Id that were
2437 -- compiled in this scope, or installed previously by
2438 -- Install_Private_Declarations.
2440 -- Before we do the swap, we verify the presence of the Full_View
2441 -- field which may be empty due to a swap by a previous call to
2442 -- End_Package_Scope (e.g. from the freezing mechanism).
2444 while Present
(Priv_Elmt
) loop
2445 Priv_Sub
:= Node
(Priv_Elmt
);
2447 if Present
(Full_View
(Priv_Sub
)) then
2449 if Scope
(Priv_Sub
) = P
2450 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
2452 Set_Is_Immediately_Visible
(Priv_Sub
, False);
2455 if Is_Visible_Dependent
(Priv_Sub
) then
2456 Preserve_Full_Attributes
2457 (Priv_Sub
, Full_View
(Priv_Sub
));
2458 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
2459 Exchange_Declarations
(Priv_Sub
);
2463 Next_Elmt
(Priv_Elmt
);
2466 -- Now restore the type itself to its private view
2468 Exchange_Declarations
(Id
);
2470 -- If we have installed an underlying full view for a type derived
2471 -- from a private type in a child unit, restore the proper views
2472 -- of private and full view. See corresponding code in
2473 -- Install_Private_Declarations.
2475 -- After the exchange, Full denotes the private type in the
2476 -- visible part of the package.
2478 if Is_Private_Base_Type
(Full
)
2479 and then Present
(Full_View
(Full
))
2480 and then Present
(Underlying_Full_View
(Full
))
2481 and then In_Package_Body
(Current_Scope
)
2483 Set_Full_View
(Full
, Underlying_Full_View
(Full
));
2484 Set_Underlying_Full_View
(Full
, Empty
);
2487 elsif Ekind
(Id
) = E_Incomplete_Type
2488 and then Comes_From_Source
(Id
)
2489 and then No
(Full_View
(Id
))
2491 -- Mark Taft amendment types. Verify that there are no primitive
2492 -- operations declared for the type (3.10.1(9)).
2494 Set_Has_Completion_In_Body
(Id
);
2501 Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2502 while Present
(Elmt
) loop
2503 Subp
:= Node
(Elmt
);
2505 -- Is_Primitive is tested because there can be cases where
2506 -- nonprimitive subprograms (in nested packages) are added
2507 -- to the Private_Dependents list.
2509 if Is_Overloadable
(Subp
) and then Is_Primitive
(Subp
) then
2511 ("type& must be completed in the private part",
2514 -- The result type of an access-to-function type cannot be a
2515 -- Taft-amendment type, unless the version is Ada 2012 or
2516 -- later (see AI05-151).
2518 elsif Ada_Version
< Ada_2012
2519 and then Ekind
(Subp
) = E_Subprogram_Type
2521 if Etype
(Subp
) = Id
2523 (Is_Class_Wide_Type
(Etype
(Subp
))
2524 and then Etype
(Etype
(Subp
)) = Id
)
2527 ("type& must be completed in the private part",
2528 Associated_Node_For_Itype
(Subp
), Id
);
2536 elsif not Is_Child_Unit
(Id
)
2537 and then (not Is_Private_Type
(Id
)
2538 or else No
(Full_View
(Id
)))
2541 Set_Is_Potentially_Use_Visible
(Id
, False);
2547 end Uninstall_Declarations
;
2549 ------------------------
2550 -- Unit_Requires_Body --
2551 ------------------------
2553 function Unit_Requires_Body
(P
: Entity_Id
) return Boolean is
2557 -- Imported entity never requires body. Right now, only subprograms can
2558 -- be imported, but perhaps in the future we will allow import of
2561 if Is_Imported
(P
) then
2564 -- Body required if library package with pragma Elaborate_Body
2566 elsif Has_Pragma_Elaborate_Body
(P
) then
2569 -- Body required if subprogram
2571 elsif Is_Subprogram
(P
) or else Is_Generic_Subprogram
(P
) then
2574 -- Treat a block as requiring a body
2576 elsif Ekind
(P
) = E_Block
then
2579 elsif Ekind
(P
) = E_Package
2580 and then Nkind
(Parent
(P
)) = N_Package_Specification
2581 and then Present
(Generic_Parent
(Parent
(P
)))
2584 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(P
));
2586 if Has_Pragma_Elaborate_Body
(G_P
) then
2592 -- Otherwise search entity chain for entity requiring completion
2594 E
:= First_Entity
(P
);
2595 while Present
(E
) loop
2597 -- Always ignore child units. Child units get added to the entity
2598 -- list of a parent unit, but are not original entities of the
2599 -- parent, and so do not affect whether the parent needs a body.
2601 if Is_Child_Unit
(E
) then
2604 -- Ignore formal packages and their renamings
2606 elsif Ekind
(E
) = E_Package
2607 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
2608 N_Formal_Package_Declaration
2612 -- Otherwise test to see if entity requires a completion.
2613 -- Note that subprogram entities whose declaration does not come
2614 -- from source are ignored here on the basis that we assume the
2615 -- expander will provide an implicit completion at some point.
2617 elsif (Is_Overloadable
(E
)
2618 and then Ekind
(E
) /= E_Enumeration_Literal
2619 and then Ekind
(E
) /= E_Operator
2620 and then not Is_Abstract_Subprogram
(E
)
2621 and then not Has_Completion
(E
)
2622 and then Comes_From_Source
(Parent
(E
)))
2625 (Ekind
(E
) = E_Package
2627 and then not Has_Completion
(E
)
2628 and then Unit_Requires_Body
(E
))
2631 (Ekind
(E
) = E_Incomplete_Type
2632 and then No
(Full_View
(E
))
2633 and then not Is_Generic_Type
(E
))
2636 ((Ekind
(E
) = E_Task_Type
or else
2637 Ekind
(E
) = E_Protected_Type
)
2638 and then not Has_Completion
(E
))
2641 (Ekind
(E
) = E_Generic_Package
and then E
/= P
2642 and then not Has_Completion
(E
)
2643 and then Unit_Requires_Body
(E
))
2646 (Is_Generic_Subprogram
(E
)
2647 and then not Has_Completion
(E
))
2652 -- Entity that does not require completion
2662 end Unit_Requires_Body
;