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 Atree
; use Atree
;
32 with Debug
; use Debug
;
33 with Einfo
; use Einfo
;
34 with Elists
; use Elists
;
35 with Errout
; use Errout
;
36 with Exp_Disp
; use Exp_Disp
;
37 with Exp_Dist
; use Exp_Dist
;
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
;
46 with Restrict
; use Restrict
;
48 with Sem_Aux
; use Sem_Aux
;
49 with Sem_Cat
; use Sem_Cat
;
50 with Sem_Ch3
; use Sem_Ch3
;
51 with Sem_Ch6
; use Sem_Ch6
;
52 with Sem_Ch8
; use Sem_Ch8
;
53 with Sem_Ch10
; use Sem_Ch10
;
54 with Sem_Ch12
; use Sem_Ch12
;
55 with Sem_Ch13
; use Sem_Ch13
;
56 with Sem_Disp
; use Sem_Disp
;
57 with Sem_Eval
; use Sem_Eval
;
58 with Sem_Util
; use Sem_Util
;
59 with Sem_Warn
; use Sem_Warn
;
60 with Snames
; use Snames
;
61 with Stand
; use Stand
;
62 with Sinfo
; use Sinfo
;
63 with Sinput
; use Sinput
;
65 with Uintp
; use Uintp
;
67 package body Sem_Ch7
is
69 -----------------------------------
70 -- Handling private declarations --
71 -----------------------------------
73 -- The principle that each entity has a single defining occurrence clashes
74 -- with the presence of two separate definitions for private types: the
75 -- first is the private type declaration, and the second is the full type
76 -- declaration. It is important that all references to the type point to
77 -- the same defining occurrence, namely the first one. To enforce the two
78 -- separate views of the entity, the corresponding information is swapped
79 -- between the two declarations. Outside of the package, the defining
80 -- occurrence only contains the private declaration information, while in
81 -- the private part and the body of the package the defining occurrence
82 -- contains the full declaration. To simplify the swap, the defining
83 -- occurrence that currently holds the private declaration points to the
84 -- full declaration. During semantic processing the defining occurrence
85 -- also points to a list of private dependents, that is to say access types
86 -- or composite types whose designated types or component types are
87 -- subtypes or derived types of the private type in question. After the
88 -- full declaration has been seen, the private dependents are updated to
89 -- indicate that they have full definitions.
91 -----------------------
92 -- Local Subprograms --
93 -----------------------
95 procedure Analyze_Package_Body_Helper
(N
: Node_Id
);
96 -- Does all the real work of Analyze_Package_Body
98 procedure Check_Anonymous_Access_Types
101 -- If the spec of a package has a limited_with_clause, it may declare
102 -- anonymous access types whose designated type is a limited view, such an
103 -- anonymous access return type for a function. This access type cannot be
104 -- elaborated in the spec itself, but it may need an itype reference if it
105 -- is used within a nested scope. In that case the itype reference is
106 -- created at the beginning of the corresponding package body and inserted
107 -- before other body declarations.
109 procedure Install_Package_Entity
(Id
: Entity_Id
);
110 -- Supporting procedure for Install_{Visible,Private}_Declarations. Places
111 -- one entity on its visibility chain, and recurses on the visible part if
112 -- the entity is an inner package.
114 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
115 -- True for a private type that is not a subtype
117 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
118 -- If the private dependent is a private type whose full view is derived
119 -- from the parent type, its full properties are revealed only if we are in
120 -- the immediate scope of the private dependent. Should this predicate be
121 -- tightened further???
123 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
124 -- Called upon entering the private part of a public child package and the
125 -- body of a nested package, to potentially declare certain inherited
126 -- subprograms that were inherited by types in the visible part, but whose
127 -- declaration was deferred because the parent operation was private and
128 -- not visible at that point. These subprograms are located by traversing
129 -- the visible part declarations looking for non-private type extensions
130 -- and then examining each of the primitive operations of such types to
131 -- find those that were inherited but declared with a special internal
132 -- name. Each such operation is now declared as an operation with a normal
133 -- name (using the name of the parent operation) and replaces the previous
134 -- implicit operation in the primitive operations list of the type. If the
135 -- inherited private operation has been overridden, then it's replaced by
136 -- the overriding operation.
138 --------------------------
139 -- Analyze_Package_Body --
140 --------------------------
142 procedure Analyze_Package_Body
(N
: Node_Id
) is
143 Loc
: constant Source_Ptr
:= Sloc
(N
);
147 Write_Str
("==> package body ");
148 Write_Name
(Chars
(Defining_Entity
(N
)));
149 Write_Str
(" from ");
150 Write_Location
(Loc
);
155 -- The real work is split out into the helper, so it can do "return;"
156 -- without skipping the debug output.
158 Analyze_Package_Body_Helper
(N
);
162 Write_Str
("<== package body ");
163 Write_Name
(Chars
(Defining_Entity
(N
)));
164 Write_Str
(" from ");
165 Write_Location
(Loc
);
168 end Analyze_Package_Body
;
170 ---------------------------------
171 -- Analyze_Package_Body_Helper --
172 ---------------------------------
174 procedure Analyze_Package_Body_Helper
(N
: Node_Id
) is
178 Last_Spec_Entity
: Entity_Id
;
182 procedure Install_Composite_Operations
(P
: Entity_Id
);
183 -- Composite types declared in the current scope may depend on types
184 -- that were private at the point of declaration, and whose full view
185 -- is now in scope. Indicate that the corresponding operations on the
186 -- composite type are available.
188 ----------------------------------
189 -- Install_Composite_Operations --
190 ----------------------------------
192 procedure Install_Composite_Operations
(P
: Entity_Id
) is
196 Id
:= First_Entity
(P
);
197 while Present
(Id
) loop
199 and then (Is_Limited_Composite
(Id
)
200 or else Is_Private_Composite
(Id
))
201 and then No
(Private_Component
(Id
))
203 Set_Is_Limited_Composite
(Id
, False);
204 Set_Is_Private_Composite
(Id
, False);
209 end Install_Composite_Operations
;
211 -- Start of processing for Analyze_Package_Body_Helper
214 -- Find corresponding package specification, and establish the current
215 -- scope. The visible defining entity for the package is the defining
216 -- occurrence in the spec. On exit from the package body, all body
217 -- declarations are attached to the defining entity for the body, but
218 -- the later is never used for name resolution. In this fashion there
219 -- is only one visible entity that denotes the package.
221 -- Set Body_Id. Note that this Will be reset to point to the generic
222 -- copy later on in the generic case.
224 Body_Id
:= Defining_Entity
(N
);
226 if Present
(Corresponding_Spec
(N
)) then
228 -- Body is body of package instantiation. Corresponding spec has
231 Spec_Id
:= Corresponding_Spec
(N
);
232 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
235 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
238 and then Is_Package_Or_Generic_Package
(Spec_Id
)
240 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
242 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
243 Error_Msg_N
("cannot supply body for package renaming", N
);
246 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
247 Error_Msg_N
("redefinition of package body", N
);
252 Error_Msg_N
("missing specification for package body", N
);
256 if Is_Package_Or_Generic_Package
(Spec_Id
)
257 and then (Scope
(Spec_Id
) = Standard_Standard
258 or else Is_Child_Unit
(Spec_Id
))
259 and then not Unit_Requires_Body
(Spec_Id
)
261 if Ada_Version
= Ada_83
then
263 ("optional package body (not allowed in Ada 95)?", N
);
265 Error_Msg_N
("spec of this package does not allow a body", N
);
270 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
271 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
273 if Is_Child_Unit
(Spec_Id
) then
274 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
276 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
279 Set_Is_Child_Unit
(Body_Id
);
282 -- Generic package case
284 if Ekind
(Spec_Id
) = E_Generic_Package
then
286 -- Disable expansion and perform semantic analysis on copy. The
287 -- unannotated body will be used in all instantiations.
289 Body_Id
:= Defining_Entity
(N
);
290 Set_Ekind
(Body_Id
, E_Package_Body
);
291 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
292 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
293 Set_Body_Entity
(Spec_Id
, Body_Id
);
294 Set_Spec_Entity
(Body_Id
, Spec_Id
);
296 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
299 -- Update Body_Id to point to the copied node for the remainder of
302 Body_Id
:= Defining_Entity
(N
);
306 -- The Body_Id is that of the copied node in the generic case, the
307 -- current node otherwise. Note that N was rewritten above, so we must
308 -- be sure to get the latest Body_Id value.
310 Set_Ekind
(Body_Id
, E_Package_Body
);
311 Set_Body_Entity
(Spec_Id
, Body_Id
);
312 Set_Spec_Entity
(Body_Id
, Spec_Id
);
314 -- Defining name for the package body is not a visible entity: Only the
315 -- defining name for the declaration is visible.
317 Set_Etype
(Body_Id
, Standard_Void_Type
);
318 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
319 Set_Corresponding_Spec
(N
, Spec_Id
);
320 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
322 -- The body entity is not used for semantics or code generation, but
323 -- it is attached to the entity list of the enclosing scope to simplify
324 -- the listing of back-annotations for the types it main contain.
326 if Scope
(Spec_Id
) /= Standard_Standard
then
327 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
330 -- Indicate that we are currently compiling the body of the package
332 Set_In_Package_Body
(Spec_Id
);
333 Set_Has_Completion
(Spec_Id
);
334 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
336 Push_Scope
(Spec_Id
);
338 Set_Categorization_From_Pragmas
(N
);
340 Install_Visible_Declarations
(Spec_Id
);
341 Install_Private_Declarations
(Spec_Id
);
342 Install_Private_With_Clauses
(Spec_Id
);
343 Install_Composite_Operations
(Spec_Id
);
345 Check_Anonymous_Access_Types
(Spec_Id
, N
);
347 if Ekind
(Spec_Id
) = E_Generic_Package
then
348 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
351 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
352 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
354 -- This is a nested package, so it may be necessary to declare certain
355 -- inherited subprograms that are not yet visible because the parent
356 -- type's subprograms are now visible.
358 if Ekind
(Scope
(Spec_Id
)) = E_Package
359 and then Scope
(Spec_Id
) /= Standard_Standard
361 Declare_Inherited_Private_Subprograms
(Spec_Id
);
364 if Present
(Declarations
(N
)) then
365 Analyze_Declarations
(Declarations
(N
));
366 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
369 -- Analyze_Declarations has caused freezing of all types. Now generate
370 -- bodies for RACW primitives and stream attributes, if any.
372 if Ekind
(Spec_Id
) = E_Package
and then Has_RACW
(Spec_Id
) then
374 -- Attach subprogram bodies to support RACWs declared in spec
376 Append_RACW_Bodies
(Declarations
(N
), Spec_Id
);
377 Analyze_List
(Declarations
(N
));
380 HSS
:= Handled_Statement_Sequence
(N
);
382 if Present
(HSS
) then
383 Process_End_Label
(HSS
, 't', Spec_Id
);
386 -- Check that elaboration code in a preelaborable package body is
387 -- empty other than null statements and labels (RM 10.2.1(6)).
389 Validate_Null_Statement_Sequence
(N
);
392 Validate_Categorization_Dependency
(N
, Spec_Id
);
393 Check_Completion
(Body_Id
);
395 -- Generate start of body reference. Note that we do this fairly late,
396 -- because the call will use In_Extended_Main_Source_Unit as a check,
397 -- and we want to make sure that Corresponding_Stub links are set
399 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
401 -- For a generic package, collect global references and mark them on
402 -- the original body so that they are not resolved again at the point
405 if Ekind
(Spec_Id
) /= E_Package
then
406 Save_Global_References
(Original_Node
(N
));
410 -- The entities of the package body have so far been chained onto the
411 -- declaration chain for the spec. That's been fine while we were in the
412 -- body, since we wanted them to be visible, but now that we are leaving
413 -- the package body, they are no longer visible, so we remove them from
414 -- the entity chain of the package spec entity, and copy them to the
415 -- entity chain of the package body entity, where they will never again
418 if Present
(Last_Spec_Entity
) then
419 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
420 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
421 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
422 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
425 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
426 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
427 Set_First_Entity
(Spec_Id
, Empty
);
428 Set_Last_Entity
(Spec_Id
, Empty
);
431 End_Package_Scope
(Spec_Id
);
433 -- All entities declared in body are not visible
439 E
:= First_Entity
(Body_Id
);
440 while Present
(E
) loop
441 Set_Is_Immediately_Visible
(E
, False);
442 Set_Is_Potentially_Use_Visible
(E
, False);
445 -- Child units may appear on the entity list (e.g. if they appear
446 -- in the context of a subunit) but they are not body entities.
448 if not Is_Child_Unit
(E
) then
449 Set_Is_Package_Body_Entity
(E
);
456 Check_References
(Body_Id
);
458 -- For a generic unit, check that the formal parameters are referenced,
459 -- and that local variables are used, as for regular packages.
461 if Ekind
(Spec_Id
) = E_Generic_Package
then
462 Check_References
(Spec_Id
);
465 -- The processing so far has made all entities of the package body
466 -- public (i.e. externally visible to the linker). This is in general
467 -- necessary, since inlined or generic bodies, for which code is
468 -- generated in other units, may need to see these entities. The
469 -- following loop runs backwards from the end of the entities of the
470 -- package body making these entities invisible until we reach a
471 -- referencer, i.e. a declaration that could reference a previous
472 -- declaration, a generic body or an inlined body, or a stub (which may
473 -- contain either of these). This is of course an approximation, but it
474 -- is conservative and definitely correct.
476 -- We only do this at the outer (library) level non-generic packages.
477 -- The reason is simply to cut down on the number of global symbols
478 -- generated, which has a double effect: (1) to make the compilation
479 -- process more efficient and (2) to give the code generator more
480 -- freedom to optimize within each unit, especially subprograms.
482 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
483 and then not Is_Generic_Unit
(Spec_Id
)
484 and then Present
(Declarations
(N
))
486 Make_Non_Public_Where_Possible
: declare
488 function Has_Referencer
490 Outer
: Boolean) return Boolean;
491 -- Traverse the given list of declarations in reverse order.
492 -- Return True if a referencer is present. Return False if none is
493 -- found. The Outer parameter is True for the outer level call and
494 -- False for inner level calls for nested packages. If Outer is
495 -- True, then any entities up to the point of hitting a referencer
496 -- get their Is_Public flag cleared, so that the entities will be
497 -- treated as static entities in the C sense, and need not have
498 -- fully qualified names. Furthermore, if the referencer is an
499 -- inlined subprogram that doesn't reference other subprograms,
500 -- we keep clearing the Is_Public flag on subprograms. For inner
501 -- levels, we need all names to be fully qualified to deal with
502 -- the same name appearing in parallel packages (right now this
503 -- is tied to their being external).
509 function Has_Referencer
511 Outer
: Boolean) return Boolean
513 Has_Referencer_Except_For_Subprograms
: Boolean := False;
520 function Check_Subprogram_Ref
(N
: Node_Id
)
521 return Traverse_Result
;
522 -- Look for references to subprograms
524 --------------------------
525 -- Check_Subprogram_Ref --
526 --------------------------
528 function Check_Subprogram_Ref
(N
: Node_Id
)
529 return Traverse_Result
534 -- Check name of procedure or function calls
536 if Nkind
(N
) in N_Subprogram_Call
537 and then Is_Entity_Name
(Name
(N
))
542 -- Check prefix of attribute references
544 if Nkind
(N
) = N_Attribute_Reference
545 and then Is_Entity_Name
(Prefix
(N
))
546 and then Present
(Entity
(Prefix
(N
)))
547 and then Ekind
(Entity
(Prefix
(N
))) in Subprogram_Kind
552 -- Check value of constants
554 if Nkind
(N
) = N_Identifier
555 and then Present
(Entity
(N
))
556 and then Ekind
(Entity
(N
)) = E_Constant
558 V
:= Constant_Value
(Entity
(N
));
560 and then not Compile_Time_Known_Value_Or_Aggr
(V
)
567 end Check_Subprogram_Ref
;
569 function Check_Subprogram_Refs
is
570 new Traverse_Func
(Check_Subprogram_Ref
);
572 -- Start of processing for Has_Referencer
580 while Present
(D
) loop
583 if K
in N_Body_Stub
then
586 -- Processing for subprogram bodies
588 elsif K
= N_Subprogram_Body
then
589 if Acts_As_Spec
(D
) then
590 E
:= Defining_Entity
(D
);
592 -- An inlined body acts as a referencer. Note also
593 -- that we never reset Is_Public for an inlined
594 -- subprogram. Gigi requires Is_Public to be set.
596 -- Note that we test Has_Pragma_Inline here rather
597 -- than Is_Inlined. We are compiling this for a
598 -- client, and it is the client who will decide if
599 -- actual inlining should occur, so we need to assume
600 -- that the procedure could be inlined for the purpose
601 -- of accessing global entities.
603 if Has_Pragma_Inline
(E
) then
605 and then Check_Subprogram_Refs
(D
) = OK
607 Has_Referencer_Except_For_Subprograms
:= True;
612 Set_Is_Public
(E
, False);
616 E
:= Corresponding_Spec
(D
);
620 -- A generic subprogram body acts as a referencer
622 if Is_Generic_Unit
(E
) then
626 if Has_Pragma_Inline
(E
) or else Is_Inlined
(E
) then
628 and then Check_Subprogram_Refs
(D
) = OK
630 Has_Referencer_Except_For_Subprograms
:= True;
638 -- Processing for package bodies
640 elsif K
= N_Package_Body
641 and then Present
(Corresponding_Spec
(D
))
643 E
:= Corresponding_Spec
(D
);
645 -- Generic package body is a referencer. It would seem
646 -- that we only have to consider generics that can be
647 -- exported, i.e. where the corresponding spec is the
648 -- spec of the current package, but because of nested
649 -- instantiations, a fully private generic body may
650 -- export other private body entities. Furthermore,
651 -- regardless of whether there was a previous inlined
652 -- subprogram, (an instantiation of) the generic package
653 -- may reference any entity declared before it.
655 if Is_Generic_Unit
(E
) then
658 -- For non-generic package body, recurse into body unless
659 -- this is an instance, we ignore instances since they
660 -- cannot have references that affect outer entities.
662 elsif not Is_Generic_Instance
(E
)
663 and then not Has_Referencer_Except_For_Subprograms
666 (Declarations
(D
), Outer
=> False)
672 -- Processing for package specs, recurse into declarations.
673 -- Again we skip this for the case of generic instances.
675 elsif K
= N_Package_Declaration
676 and then not Has_Referencer_Except_For_Subprograms
678 S
:= Specification
(D
);
680 if not Is_Generic_Unit
(Defining_Entity
(S
)) then
682 (Private_Declarations
(S
), Outer
=> False)
686 (Visible_Declarations
(S
), Outer
=> False)
692 -- Objects and exceptions need not be public if we have not
693 -- encountered a referencer so far. We only reset the flag
694 -- for outer level entities that are not imported/exported,
695 -- and which have no interface name.
697 elsif Nkind_In
(K
, N_Object_Declaration
,
698 N_Exception_Declaration
,
699 N_Subprogram_Declaration
)
701 E
:= Defining_Entity
(D
);
704 and then (not Has_Referencer_Except_For_Subprograms
705 or else K
= N_Subprogram_Declaration
)
706 and then not Is_Imported
(E
)
707 and then not Is_Exported
(E
)
708 and then No
(Interface_Name
(E
))
710 Set_Is_Public
(E
, False);
717 return Has_Referencer_Except_For_Subprograms
;
720 -- Start of processing for Make_Non_Public_Where_Possible
725 pragma Warnings
(Off
, Discard
);
728 Discard
:= Has_Referencer
(Declarations
(N
), Outer
=> True);
730 end Make_Non_Public_Where_Possible
;
733 -- If expander is not active, then here is where we turn off the
734 -- In_Package_Body flag, otherwise it is turned off at the end of the
735 -- corresponding expansion routine. If this is an instance body, we need
736 -- to qualify names of local entities, because the body may have been
737 -- compiled as a preliminary to another instantiation.
739 if not Expander_Active
then
740 Set_In_Package_Body
(Spec_Id
, False);
742 if Is_Generic_Instance
(Spec_Id
)
743 and then Operating_Mode
= Generate_Code
745 Qualify_Entity_Names
(N
);
748 end Analyze_Package_Body_Helper
;
750 ---------------------------------
751 -- Analyze_Package_Declaration --
752 ---------------------------------
754 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
755 Id
: constant Node_Id
:= Defining_Entity
(N
);
758 -- True when in the context of a declared pure library unit
760 Body_Required
: Boolean;
761 -- True when this package declaration requires a corresponding body
764 -- True when this package declaration is not a nested declaration
767 -- Analye aspect specifications immediately, since we need to recognize
768 -- things like Pure early enough to diagnose violations during analysis.
770 if Has_Aspects
(N
) then
771 Analyze_Aspect_Specifications
(N
, Id
);
774 -- Ada 2005 (AI-217): Check if the package has been erroneously named
775 -- in a limited-with clause of its own context. In this case the error
776 -- has been previously notified by Analyze_Context.
778 -- limited with Pkg; -- ERROR
779 -- package Pkg is ...
781 if From_With_Type
(Id
) then
786 Write_Str
("==> package spec ");
787 Write_Name
(Chars
(Id
));
788 Write_Str
(" from ");
789 Write_Location
(Sloc
(N
));
794 Generate_Definition
(Id
);
796 Set_Ekind
(Id
, E_Package
);
797 Set_Etype
(Id
, Standard_Void_Type
);
801 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
802 Set_Is_Pure
(Id
, PF
);
804 Set_Categorization_From_Pragmas
(N
);
806 Analyze
(Specification
(N
));
807 Validate_Categorization_Dependency
(N
, Id
);
809 Body_Required
:= Unit_Requires_Body
(Id
);
811 -- When this spec does not require an explicit body, we know that there
812 -- are no entities requiring completion in the language sense; we call
813 -- Check_Completion here only to ensure that any nested package
814 -- declaration that requires an implicit body gets one. (In the case
815 -- where a body is required, Check_Completion is called at the end of
816 -- the body's declarative part.)
818 if not Body_Required
then
822 Comp_Unit
:= Nkind
(Parent
(N
)) = N_Compilation_Unit
;
825 -- Set Body_Required indication on the compilation unit node, and
826 -- determine whether elaboration warnings may be meaningful on it.
828 Set_Body_Required
(Parent
(N
), Body_Required
);
830 if not Body_Required
then
831 Set_Suppress_Elaboration_Warnings
(Id
);
836 End_Package_Scope
(Id
);
838 -- For the declaration of a library unit that is a remote types package,
839 -- check legality rules regarding availability of stream attributes for
840 -- types that contain non-remote access values. This subprogram performs
841 -- visibility tests that rely on the fact that we have exited the scope
845 Validate_RT_RAT_Component
(N
);
850 Write_Str
("<== package spec ");
851 Write_Name
(Chars
(Id
));
852 Write_Str
(" from ");
853 Write_Location
(Sloc
(N
));
856 end Analyze_Package_Declaration
;
858 -----------------------------------
859 -- Analyze_Package_Specification --
860 -----------------------------------
862 -- Note that this code is shared for the analysis of generic package specs
863 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
865 procedure Analyze_Package_Specification
(N
: Node_Id
) is
866 Id
: constant Entity_Id
:= Defining_Entity
(N
);
867 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
868 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
869 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
872 Public_Child
: Boolean;
874 Private_With_Clauses_Installed
: Boolean := False;
875 -- In Ada 2005, private with_clauses are visible in the private part
876 -- of a nested package, even if it appears in the public part of the
877 -- enclosing package. This requires a separate step to install these
878 -- private_with_clauses, and remove them at the end of the nested
881 procedure Check_One_Tagged_Type_Or_Extension_At_Most
;
882 -- Issue an error in SPARK mode if a package specification contains
883 -- more than one tagged type or type extension.
885 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
886 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
887 -- Is_True_Constant) on all variables that are entities of Id, and on
888 -- the chain whose first element is FE. A recursive call is made for all
889 -- packages and generic packages.
891 procedure Generate_Parent_References
;
892 -- For a child unit, generate references to parent units, for
893 -- GPS navigation purposes.
895 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
896 -- Child and Unit are entities of compilation units. True if Child
897 -- is a public child of Parent as defined in 10.1.1
899 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
900 -- Reject completion of an incomplete or private type declarations
901 -- having a known discriminant part by an unchecked union.
903 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
904 -- Given the package entity of a generic package instantiation or
905 -- formal package whose corresponding generic is a child unit, installs
906 -- the private declarations of each of the child unit's parents.
907 -- This has to be done at the point of entering the instance package's
908 -- private part rather than being done in Sem_Ch12.Install_Parent
909 -- (which is where the parents' visible declarations are installed).
911 ------------------------------------------------
912 -- Check_One_Tagged_Type_Or_Extension_At_Most --
913 ------------------------------------------------
915 procedure Check_One_Tagged_Type_Or_Extension_At_Most
is
918 procedure Check_Decls
(Decls
: List_Id
);
919 -- Check that either Previous is Empty and Decls does not contain
920 -- more than one tagged type or type extension, or Previous is
921 -- already set and Decls contains no tagged type or type extension.
927 procedure Check_Decls
(Decls
: List_Id
) is
931 Decl
:= First
(Decls
);
932 while Present
(Decl
) loop
933 if Nkind
(Decl
) = N_Full_Type_Declaration
934 and then Is_Tagged_Type
(Defining_Identifier
(Decl
))
936 if No
(Previous
) then
940 Error_Msg_Sloc
:= Sloc
(Previous
);
941 Check_SPARK_Restriction
942 ("at most one tagged type or type extension allowed",
943 "\\ previous declaration#",
952 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
956 Check_Decls
(Vis_Decls
);
958 if Present
(Priv_Decls
) then
959 Check_Decls
(Priv_Decls
);
961 end Check_One_Tagged_Type_Or_Extension_At_Most
;
963 ---------------------
964 -- Clear_Constants --
965 ---------------------
967 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
971 -- Ignore package renamings, not interesting and they can cause self
972 -- referential loops in the code below.
974 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
978 -- Note: in the loop below, the check for Next_Entity pointing back
979 -- to the package entity may seem odd, but it is needed, because a
980 -- package can contain a renaming declaration to itself, and such
981 -- renamings are generated automatically within package instances.
984 while Present
(E
) and then E
/= Id
loop
985 if Is_Assignable
(E
) then
986 Set_Never_Set_In_Source
(E
, False);
987 Set_Is_True_Constant
(E
, False);
988 Set_Current_Value
(E
, Empty
);
989 Set_Is_Known_Null
(E
, False);
990 Set_Last_Assignment
(E
, Empty
);
992 if not Can_Never_Be_Null
(E
) then
993 Set_Is_Known_Non_Null
(E
, False);
996 elsif Is_Package_Or_Generic_Package
(E
) then
997 Clear_Constants
(E
, First_Entity
(E
));
998 Clear_Constants
(E
, First_Private_Entity
(E
));
1003 end Clear_Constants
;
1005 --------------------------------
1006 -- Generate_Parent_References --
1007 --------------------------------
1009 procedure Generate_Parent_References
is
1010 Decl
: constant Node_Id
:= Parent
(N
);
1013 if Id
= Cunit_Entity
(Main_Unit
)
1014 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
1016 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1018 elsif not Nkind_In
(Unit
(Cunit
(Main_Unit
)), N_Subprogram_Body
,
1021 -- If current unit is an ancestor of main unit, generate a
1022 -- reference to its own parent.
1026 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
1029 if Nkind
(Main_Spec
) = N_Package_Body
then
1030 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
1033 U
:= Parent_Spec
(Main_Spec
);
1034 while Present
(U
) loop
1035 if U
= Parent
(Decl
) then
1036 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1039 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
1043 U
:= Parent_Spec
(Unit
(U
));
1048 end Generate_Parent_References
;
1050 ---------------------
1051 -- Is_Public_Child --
1052 ---------------------
1054 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
1056 if not Is_Private_Descendant
(Child
) then
1059 if Child
= Unit
then
1060 return not Private_Present
(
1061 Parent
(Unit_Declaration_Node
(Child
)));
1063 return Is_Public_Child
(Scope
(Child
), Unit
);
1066 end Is_Public_Child
;
1068 ----------------------------------------
1069 -- Inspect_Unchecked_Union_Completion --
1070 ----------------------------------------
1072 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
1076 Decl
:= First
(Decls
);
1077 while Present
(Decl
) loop
1079 -- We are looking at an incomplete or private type declaration
1080 -- with a known_discriminant_part whose full view is an
1083 if Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
1084 N_Private_Type_Declaration
)
1085 and then Has_Discriminants
(Defining_Identifier
(Decl
))
1086 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
1088 Is_Unchecked_Union
(Full_View
(Defining_Identifier
(Decl
)))
1091 ("completion of discriminated partial view "
1092 & "cannot be an unchecked union",
1093 Full_View
(Defining_Identifier
(Decl
)));
1098 end Inspect_Unchecked_Union_Completion
;
1100 -----------------------------------------
1101 -- Install_Parent_Private_Declarations --
1102 -----------------------------------------
1104 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
1105 Inst_Par
: Entity_Id
;
1106 Gen_Par
: Entity_Id
;
1107 Inst_Node
: Node_Id
;
1110 Inst_Par
:= Inst_Id
;
1113 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
1114 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
1115 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
1117 if Nkind_In
(Inst_Node
, N_Package_Instantiation
,
1118 N_Formal_Package_Declaration
)
1119 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
1121 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
1123 if Present
(Renamed_Entity
(Inst_Par
)) then
1124 Inst_Par
:= Renamed_Entity
(Inst_Par
);
1129 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
1131 -- Install the private declarations and private use clauses
1132 -- of a parent instance of the child instance, unless the
1133 -- parent instance private declarations have already been
1134 -- installed earlier in Analyze_Package_Specification, which
1135 -- happens when a generic child is instantiated, and the
1136 -- instance is a child of the parent instance.
1138 -- Installing the use clauses of the parent instance twice
1139 -- is both unnecessary and wrong, because it would cause the
1140 -- clauses to be chained to themselves in the use clauses
1141 -- list of the scope stack entry. That in turn would cause
1142 -- an endless loop from End_Use_Clauses upon scope exit.
1144 -- The parent is now fully visible. It may be a hidden open
1145 -- scope if we are currently compiling some child instance
1146 -- declared within it, but while the current instance is being
1147 -- compiled the parent is immediately visible. In particular
1148 -- its entities must remain visible if a stack save/restore
1149 -- takes place through a call to Rtsfind.
1151 if Present
(Gen_Par
) then
1152 if not In_Private_Part
(Inst_Par
) then
1153 Install_Private_Declarations
(Inst_Par
);
1154 Set_Use
(Private_Declarations
1156 (Unit_Declaration_Node
(Inst_Par
))));
1157 Set_Is_Hidden_Open_Scope
(Inst_Par
, False);
1160 -- If we've reached the end of the generic instance parents,
1161 -- then finish off by looping through the nongeneric parents
1162 -- and installing their private declarations.
1165 while Present
(Inst_Par
)
1166 and then Inst_Par
/= Standard_Standard
1167 and then (not In_Open_Scopes
(Inst_Par
)
1168 or else not In_Private_Part
(Inst_Par
))
1170 Install_Private_Declarations
(Inst_Par
);
1171 Set_Use
(Private_Declarations
1173 (Unit_Declaration_Node
(Inst_Par
))));
1174 Inst_Par
:= Scope
(Inst_Par
);
1184 end Install_Parent_Private_Declarations
;
1186 -- Start of processing for Analyze_Package_Specification
1189 if Present
(Vis_Decls
) then
1190 Analyze_Declarations
(Vis_Decls
);
1193 -- Verify that incomplete types have received full declarations and
1194 -- also build invariant procedures for any types with invariants.
1196 E
:= First_Entity
(Id
);
1197 while Present
(E
) loop
1199 -- Check on incomplete types
1201 -- AI05-0213: A formal incomplete type has no completion
1203 if Ekind
(E
) = E_Incomplete_Type
1204 and then No
(Full_View
(E
))
1205 and then not Is_Generic_Type
(E
)
1207 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
1210 -- Build invariant procedures
1212 if Is_Type
(E
) and then Has_Invariants
(E
) then
1213 Build_Invariant_Procedure
(E
, N
);
1219 if Is_Remote_Call_Interface
(Id
)
1220 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
1222 Validate_RCI_Declarations
(Id
);
1225 -- Save global references in the visible declarations, before installing
1226 -- private declarations of parent unit if there is one, because the
1227 -- privacy status of types defined in the parent will change. This is
1228 -- only relevant for generic child units, but is done in all cases for
1231 if Ekind
(Id
) = E_Generic_Package
1232 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1235 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1236 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1238 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1239 Save_Global_References
(Orig_Decl
);
1240 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1244 -- If package is a public child unit, then make the private declarations
1245 -- of the parent visible.
1247 Public_Child
:= False;
1251 Pack_Decl
: Node_Id
;
1256 Par_Spec
:= Parent_Spec
(Parent
(N
));
1258 -- If the package is formal package of an enclosing generic, it is
1259 -- transformed into a local generic declaration, and compiled to make
1260 -- its spec available. We need to retrieve the original generic to
1261 -- determine whether it is a child unit, and install its parents.
1265 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1267 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1268 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1271 if Present
(Par_Spec
) then
1272 Generate_Parent_References
;
1274 while Scope
(Par
) /= Standard_Standard
1275 and then Is_Public_Child
(Id
, Par
)
1276 and then In_Open_Scopes
(Par
)
1278 Public_Child
:= True;
1280 Install_Private_Declarations
(Par
);
1281 Install_Private_With_Clauses
(Par
);
1282 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1283 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1288 if Is_Compilation_Unit
(Id
) then
1289 Install_Private_With_Clauses
(Id
);
1292 -- The current compilation unit may include private with_clauses,
1293 -- which are visible in the private part of the current nested
1294 -- package, and have to be installed now. This is not done for
1295 -- nested instantiations, where the private with_clauses of the
1296 -- enclosing unit have no effect once the instantiation info is
1297 -- established and we start analyzing the package declaration.
1300 Comp_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
1302 if Is_Package_Or_Generic_Package
(Comp_Unit
)
1303 and then not In_Private_Part
(Comp_Unit
)
1304 and then not In_Instance
1306 Install_Private_With_Clauses
(Comp_Unit
);
1307 Private_With_Clauses_Installed
:= True;
1312 -- If this is a package associated with a generic instance or formal
1313 -- package, then the private declarations of each of the generic's
1314 -- parents must be installed at this point.
1316 if Is_Generic_Instance
(Id
) then
1317 Install_Parent_Private_Declarations
(Id
);
1320 -- Analyze private part if present. The flag In_Private_Part is reset
1321 -- in End_Package_Scope.
1323 L
:= Last_Entity
(Id
);
1325 if Present
(Priv_Decls
) then
1326 Set_In_Private_Part
(Id
);
1328 -- Upon entering a public child's private part, it may be necessary
1329 -- to declare subprograms that were derived in the package's visible
1330 -- part but not yet made visible.
1332 if Public_Child
then
1333 Declare_Inherited_Private_Subprograms
(Id
);
1336 Analyze_Declarations
(Priv_Decls
);
1338 -- Check the private declarations for incomplete deferred constants
1340 Inspect_Deferred_Constant_Completion
(Priv_Decls
);
1342 -- The first private entity is the immediate follower of the last
1343 -- visible entity, if there was one.
1346 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1348 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
1351 -- There may be inherited private subprograms that need to be declared,
1352 -- even in the absence of an explicit private part. If there are any
1353 -- public declarations in the package and the package is a public child
1354 -- unit, then an implicit private part is assumed.
1356 elsif Present
(L
) and then Public_Child
then
1357 Set_In_Private_Part
(Id
);
1358 Declare_Inherited_Private_Subprograms
(Id
);
1359 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1362 E
:= First_Entity
(Id
);
1363 while Present
(E
) loop
1365 -- Check rule of 3.6(11), which in general requires waiting till all
1366 -- full types have been seen.
1368 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1369 Check_Aliased_Component_Types
(E
);
1372 -- Check preelaborable initialization for full type completing a
1373 -- private type for which pragma Preelaborable_Initialization given.
1376 and then Must_Have_Preelab_Init
(E
)
1377 and then not Has_Preelaborable_Initialization
(E
)
1380 ("full view of & does not have preelaborable initialization", E
);
1383 -- An invariant may appear on a full view of a type
1386 and then Has_Private_Declaration
(E
)
1387 and then Nkind
(Parent
(E
)) = N_Full_Type_Declaration
1388 and then Has_Aspects
(Parent
(E
))
1390 Build_Invariant_Procedure
(E
, N
);
1396 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1397 -- declaration having a known_discriminant_part shall not be an
1398 -- unchecked union type.
1400 if Present
(Vis_Decls
) then
1401 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1404 if Present
(Priv_Decls
) then
1405 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1408 if Ekind
(Id
) = E_Generic_Package
1409 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1410 and then Present
(Priv_Decls
)
1412 -- Save global references in private declarations, ignoring the
1413 -- visible declarations that were processed earlier.
1416 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1417 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1418 Save_Form
: constant List_Id
:=
1419 Generic_Formal_Declarations
(Orig_Decl
);
1422 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1423 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1424 Save_Global_References
(Orig_Decl
);
1425 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1426 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1430 Process_End_Label
(N
, 'e', Id
);
1432 -- Remove private_with_clauses of enclosing compilation unit, if they
1435 if Private_With_Clauses_Installed
then
1436 Remove_Private_With_Clauses
(Cunit
(Current_Sem_Unit
));
1439 -- For the case of a library level package, we must go through all the
1440 -- entities clearing the indications that the value may be constant and
1441 -- not modified. Why? Because any client of this package may modify
1442 -- these values freely from anywhere. This also applies to any nested
1443 -- packages or generic packages.
1445 -- For now we unconditionally clear constants for packages that are
1446 -- instances of generic packages. The reason is that we do not have the
1447 -- body yet, and we otherwise think things are unreferenced when they
1448 -- are not. This should be fixed sometime (the effect is not terrible,
1449 -- we just lose some warnings, and also some cases of value propagation)
1452 if Is_Library_Level_Entity
(Id
)
1453 or else Is_Generic_Instance
(Id
)
1455 Clear_Constants
(Id
, First_Entity
(Id
));
1456 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1459 Check_One_Tagged_Type_Or_Extension_At_Most
;
1460 end Analyze_Package_Specification
;
1462 --------------------------------------
1463 -- Analyze_Private_Type_Declaration --
1464 --------------------------------------
1466 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1467 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1468 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1471 Generate_Definition
(Id
);
1472 Set_Is_Pure
(Id
, PF
);
1473 Init_Size_Align
(Id
);
1475 if not Is_Package_Or_Generic_Package
(Current_Scope
)
1476 or else In_Private_Part
(Current_Scope
)
1478 Error_Msg_N
("invalid context for private declaration", N
);
1481 New_Private_Type
(N
, Id
, N
);
1482 Set_Depends_On_Private
(Id
);
1484 if Has_Aspects
(N
) then
1485 Analyze_Aspect_Specifications
(N
, Id
);
1487 end Analyze_Private_Type_Declaration
;
1489 ----------------------------------
1490 -- Check_Anonymous_Access_Types --
1491 ----------------------------------
1493 procedure Check_Anonymous_Access_Types
1494 (Spec_Id
: Entity_Id
;
1501 -- Itype references are only needed by gigi, to force elaboration of
1502 -- itypes. In the absence of code generation, they are not needed.
1504 if not Expander_Active
then
1508 E
:= First_Entity
(Spec_Id
);
1509 while Present
(E
) loop
1510 if Ekind
(E
) = E_Anonymous_Access_Type
1511 and then From_With_Type
(E
)
1513 IR
:= Make_Itype_Reference
(Sloc
(P_Body
));
1516 if No
(Declarations
(P_Body
)) then
1517 Set_Declarations
(P_Body
, New_List
(IR
));
1519 Prepend
(IR
, Declarations
(P_Body
));
1525 end Check_Anonymous_Access_Types
;
1527 -------------------------------------------
1528 -- Declare_Inherited_Private_Subprograms --
1529 -------------------------------------------
1531 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1533 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1534 -- Check whether an inherited subprogram S is an operation of an
1535 -- untagged derived type T.
1537 ---------------------
1538 -- Is_Primitive_Of --
1539 ---------------------
1541 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1545 -- If the full view is a scalar type, the type is the anonymous base
1546 -- type, but the operation mentions the first subtype, so check the
1547 -- signature against the base type.
1549 if Base_Type
(Etype
(S
)) = Base_Type
(T
) then
1553 Formal
:= First_Formal
(S
);
1554 while Present
(Formal
) loop
1555 if Base_Type
(Etype
(Formal
)) = Base_Type
(T
) then
1559 Next_Formal
(Formal
);
1564 end Is_Primitive_Of
;
1571 Op_Elmt_2
: Elmt_Id
;
1572 Prim_Op
: Entity_Id
;
1573 New_Op
: Entity_Id
:= Empty
;
1574 Parent_Subp
: Entity_Id
;
1577 -- Start of processing for Declare_Inherited_Private_Subprograms
1580 E
:= First_Entity
(Id
);
1581 while Present
(E
) loop
1583 -- If the entity is a nonprivate type extension whose parent type
1584 -- is declared in an open scope, then the type may have inherited
1585 -- operations that now need to be made visible. Ditto if the entity
1586 -- is a formal derived type in a child unit.
1588 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1590 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1591 and then Is_Generic_Type
(E
)))
1592 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1593 and then Is_Base_Type
(E
)
1595 if Is_Tagged_Type
(E
) then
1596 Op_List
:= Primitive_Operations
(E
);
1598 Tag
:= First_Tag_Component
(E
);
1600 Op_Elmt
:= First_Elmt
(Op_List
);
1601 while Present
(Op_Elmt
) loop
1602 Prim_Op
:= Node
(Op_Elmt
);
1604 -- Search primitives that are implicit operations with an
1605 -- internal name whose parent operation has a normal name.
1607 if Present
(Alias
(Prim_Op
))
1608 and then Find_Dispatching_Type
(Alias
(Prim_Op
)) /= E
1609 and then not Comes_From_Source
(Prim_Op
)
1610 and then Is_Internal_Name
(Chars
(Prim_Op
))
1611 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1613 Parent_Subp
:= Alias
(Prim_Op
);
1615 -- Case 1: Check if the type has also an explicit
1616 -- overriding for this primitive.
1618 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1619 while Present
(Op_Elmt_2
) loop
1621 -- Skip entities with attribute Interface_Alias since
1622 -- they are not overriding primitives (these entities
1623 -- link an interface primitive with their covering
1626 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
1627 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
1628 and then No
(Interface_Alias
(Node
(Op_Elmt_2
)))
1630 -- The private inherited operation has been
1631 -- overridden by an explicit subprogram: replace
1632 -- the former by the latter.
1634 New_Op
:= Node
(Op_Elmt_2
);
1635 Replace_Elmt
(Op_Elmt
, New_Op
);
1636 Remove_Elmt
(Op_List
, Op_Elmt_2
);
1637 Set_Overridden_Operation
(New_Op
, Parent_Subp
);
1639 -- We don't need to inherit its dispatching slot.
1640 -- Set_All_DT_Position has previously ensured that
1641 -- the same slot was assigned to the two primitives
1644 and then Present
(DTC_Entity
(New_Op
))
1645 and then Present
(DTC_Entity
(Prim_Op
))
1647 pragma Assert
(DT_Position
(New_Op
)
1648 = DT_Position
(Prim_Op
));
1652 goto Next_Primitive
;
1655 Next_Elmt
(Op_Elmt_2
);
1658 -- Case 2: We have not found any explicit overriding and
1659 -- hence we need to declare the operation (i.e., make it
1662 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1664 -- Inherit the dispatching slot if E is already frozen
1667 and then Present
(DTC_Entity
(Alias
(Prim_Op
)))
1669 Set_DTC_Entity_Value
(E
, New_Op
);
1670 Set_DT_Position
(New_Op
,
1671 DT_Position
(Alias
(Prim_Op
)));
1675 (Is_Dispatching_Operation
(New_Op
)
1676 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
1678 -- Substitute the new operation for the old one in the
1679 -- type's primitive operations list. Since the new
1680 -- operation was also just added to the end of list,
1681 -- the last element must be removed.
1683 -- (Question: is there a simpler way of declaring the
1684 -- operation, say by just replacing the name of the
1685 -- earlier operation, reentering it in the in the symbol
1686 -- table (how?), and marking it as private???)
1688 Replace_Elmt
(Op_Elmt
, New_Op
);
1689 Remove_Last_Elmt
(Op_List
);
1693 Next_Elmt
(Op_Elmt
);
1696 -- Generate listing showing the contents of the dispatch table
1698 if Debug_Flag_ZZ
then
1703 -- Non-tagged type, scan forward to locate inherited hidden
1706 Prim_Op
:= Next_Entity
(E
);
1707 while Present
(Prim_Op
) loop
1708 if Is_Subprogram
(Prim_Op
)
1709 and then Present
(Alias
(Prim_Op
))
1710 and then not Comes_From_Source
(Prim_Op
)
1711 and then Is_Internal_Name
(Chars
(Prim_Op
))
1712 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1713 and then Is_Primitive_Of
(E
, Prim_Op
)
1715 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1718 Next_Entity
(Prim_Op
);
1725 end Declare_Inherited_Private_Subprograms
;
1727 -----------------------
1728 -- End_Package_Scope --
1729 -----------------------
1731 procedure End_Package_Scope
(P
: Entity_Id
) is
1733 Uninstall_Declarations
(P
);
1735 end End_Package_Scope
;
1737 ---------------------------
1738 -- Exchange_Declarations --
1739 ---------------------------
1741 procedure Exchange_Declarations
(Id
: Entity_Id
) is
1742 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
1743 H1
: constant Entity_Id
:= Homonym
(Id
);
1744 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
1749 -- If missing full declaration for type, nothing to exchange
1751 if No
(Full_Id
) then
1755 -- Otherwise complete the exchange, and preserve semantic links
1757 Next2
:= Next_Entity
(Full_Id
);
1758 H2
:= Homonym
(Full_Id
);
1760 -- Reset full declaration pointer to reflect the switched entities and
1761 -- readjust the next entity chains.
1763 Exchange_Entities
(Id
, Full_Id
);
1765 Set_Next_Entity
(Id
, Next1
);
1766 Set_Homonym
(Id
, H1
);
1768 Set_Full_View
(Full_Id
, Id
);
1769 Set_Next_Entity
(Full_Id
, Next2
);
1770 Set_Homonym
(Full_Id
, H2
);
1771 end Exchange_Declarations
;
1773 ----------------------------
1774 -- Install_Package_Entity --
1775 ----------------------------
1777 procedure Install_Package_Entity
(Id
: Entity_Id
) is
1779 if not Is_Internal
(Id
) then
1780 if Debug_Flag_E
then
1781 Write_Str
("Install: ");
1782 Write_Name
(Chars
(Id
));
1786 if not Is_Child_Unit
(Id
) then
1787 Set_Is_Immediately_Visible
(Id
);
1791 end Install_Package_Entity
;
1793 ----------------------------------
1794 -- Install_Private_Declarations --
1795 ----------------------------------
1797 procedure Install_Private_Declarations
(P
: Entity_Id
) is
1799 Priv_Elmt
: Elmt_Id
;
1804 -- First exchange declarations for private types, so that the full
1805 -- declaration is visible. For each private type, we check its
1806 -- Private_Dependents list and also exchange any subtypes of or derived
1807 -- types from it. Finally, if this is a Taft amendment type, the
1808 -- incomplete declaration is irrelevant, and we want to link the
1809 -- eventual full declaration with the original private one so we also
1810 -- skip the exchange.
1812 Id
:= First_Entity
(P
);
1813 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1814 if Is_Private_Base_Type
(Id
)
1815 and then Comes_From_Source
(Full_View
(Id
))
1816 and then Present
(Full_View
(Id
))
1817 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
1818 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
1820 -- If there is a use-type clause on the private type, set the
1821 -- full view accordingly.
1823 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
1824 Full
:= Full_View
(Id
);
1826 if Is_Private_Base_Type
(Full
)
1827 and then Has_Private_Declaration
(Full
)
1828 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
1829 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
1830 and then In_Package_Body
(Current_Scope
)
1831 and then not Is_Private_Type
(Etype
(Full
))
1833 -- This is the completion of a private type by a derivation
1834 -- from another private type which is not private anymore. This
1835 -- can only happen in a package nested within a child package,
1836 -- when the parent type is defined in the parent unit. At this
1837 -- point the current type is not private either, and we have to
1838 -- install the underlying full view, which is now visible. Save
1839 -- the current full view as well, so that all views can be
1840 -- restored on exit. It may seem that after compiling the child
1841 -- body there are not environments to restore, but the back-end
1842 -- expects those links to be valid, and freeze nodes depend on
1845 if No
(Full_View
(Full
))
1846 and then Present
(Underlying_Full_View
(Full
))
1848 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
1849 Set_Underlying_Full_View
(Id
, Full
);
1851 Set_Underlying_Full_View
(Full
, Empty
);
1852 Set_Is_Frozen
(Full_View
(Id
));
1856 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1858 Exchange_Declarations
(Id
);
1859 Set_Is_Immediately_Visible
(Id
);
1861 while Present
(Priv_Elmt
) loop
1862 Priv
:= Node
(Priv_Elmt
);
1864 -- Before the exchange, verify that the presence of the
1865 -- Full_View field. It will be empty if the entity has already
1866 -- been installed due to a previous call.
1868 if Present
(Full_View
(Priv
))
1869 and then Is_Visible_Dependent
(Priv
)
1872 -- For each subtype that is swapped, we also swap the
1873 -- reference to it in Private_Dependents, to allow access
1874 -- to it when we swap them out in End_Package_Scope.
1876 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
1877 Exchange_Declarations
(Priv
);
1878 Set_Is_Immediately_Visible
1879 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
1880 Set_Is_Potentially_Use_Visible
1881 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
1884 Next_Elmt
(Priv_Elmt
);
1891 -- Next make other declarations in the private part visible as well
1893 Id
:= First_Private_Entity
(P
);
1894 while Present
(Id
) loop
1895 Install_Package_Entity
(Id
);
1896 Set_Is_Hidden
(Id
, False);
1900 -- Indicate that the private part is currently visible, so it can be
1901 -- properly reset on exit.
1903 Set_In_Private_Part
(P
);
1904 end Install_Private_Declarations
;
1906 ----------------------------------
1907 -- Install_Visible_Declarations --
1908 ----------------------------------
1910 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
1912 Last_Entity
: Entity_Id
;
1916 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
1918 if Is_Package_Or_Generic_Package
(P
) then
1919 Last_Entity
:= First_Private_Entity
(P
);
1921 Last_Entity
:= Empty
;
1924 Id
:= First_Entity
(P
);
1925 while Present
(Id
) and then Id
/= Last_Entity
loop
1926 Install_Package_Entity
(Id
);
1929 end Install_Visible_Declarations
;
1931 --------------------------
1932 -- Is_Private_Base_Type --
1933 --------------------------
1935 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
1937 return Ekind
(E
) = E_Private_Type
1938 or else Ekind
(E
) = E_Limited_Private_Type
1939 or else Ekind
(E
) = E_Record_Type_With_Private
;
1940 end Is_Private_Base_Type
;
1942 --------------------------
1943 -- Is_Visible_Dependent --
1944 --------------------------
1946 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
1948 S
: constant Entity_Id
:= Scope
(Dep
);
1951 -- Renamings created for actual types have the visibility of the actual
1953 if Ekind
(S
) = E_Package
1954 and then Is_Generic_Instance
(S
)
1955 and then (Is_Generic_Actual_Type
(Dep
)
1956 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
1960 elsif not (Is_Derived_Type
(Dep
))
1961 and then Is_Derived_Type
(Full_View
(Dep
))
1963 -- When instantiating a package body, the scope stack is empty, so
1964 -- check instead whether the dependent type is defined in the same
1965 -- scope as the instance itself.
1967 return In_Open_Scopes
(S
)
1968 or else (Is_Generic_Instance
(Current_Scope
)
1969 and then Scope
(Dep
) = Scope
(Current_Scope
));
1973 end Is_Visible_Dependent
;
1975 ----------------------------
1976 -- May_Need_Implicit_Body --
1977 ----------------------------
1979 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
1980 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
1981 S
: constant Node_Id
:= Parent
(P
);
1986 if not Has_Completion
(E
)
1987 and then Nkind
(P
) = N_Package_Declaration
1988 and then (Present
(Activation_Chain_Entity
(P
)) or else Has_RACW
(E
))
1991 Make_Package_Body
(Sloc
(E
),
1992 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
1993 Chars
=> Chars
(E
)),
1994 Declarations
=> New_List
);
1996 if Nkind
(S
) = N_Package_Specification
then
1997 if Present
(Private_Declarations
(S
)) then
1998 Decls
:= Private_Declarations
(S
);
2000 Decls
:= Visible_Declarations
(S
);
2003 Decls
:= Declarations
(S
);
2009 end May_Need_Implicit_Body
;
2011 ----------------------
2012 -- New_Private_Type --
2013 ----------------------
2015 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
2017 -- For other than Ada 2012, enter the name in the current scope
2019 if Ada_Version
< Ada_2012
then
2022 -- Ada 2012 (AI05-0162): Enter the name in the current scope handling
2023 -- private type that completes an incomplete type.
2029 Prev
:= Find_Type_Name
(N
);
2030 pragma Assert
(Prev
= Id
2031 or else (Ekind
(Prev
) = E_Incomplete_Type
2032 and then Present
(Full_View
(Prev
))
2033 and then Full_View
(Prev
) = Id
));
2037 if Limited_Present
(Def
) then
2038 Set_Ekind
(Id
, E_Limited_Private_Type
);
2040 Set_Ekind
(Id
, E_Private_Type
);
2044 Set_Has_Delayed_Freeze
(Id
);
2045 Set_Is_First_Subtype
(Id
);
2046 Init_Size_Align
(Id
);
2048 Set_Is_Constrained
(Id
,
2049 No
(Discriminant_Specifications
(N
))
2050 and then not Unknown_Discriminants_Present
(N
));
2052 -- Set tagged flag before processing discriminants, to catch illegal
2055 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
2057 Set_Discriminant_Constraint
(Id
, No_Elist
);
2058 Set_Stored_Constraint
(Id
, No_Elist
);
2060 if Present
(Discriminant_Specifications
(N
)) then
2062 Process_Discriminants
(N
);
2065 elsif Unknown_Discriminants_Present
(N
) then
2066 Set_Has_Unknown_Discriminants
(Id
);
2069 Set_Private_Dependents
(Id
, New_Elmt_List
);
2071 if Tagged_Present
(Def
) then
2072 Set_Ekind
(Id
, E_Record_Type_With_Private
);
2073 Set_Direct_Primitive_Operations
(Id
, New_Elmt_List
);
2074 Set_Is_Abstract_Type
(Id
, Abstract_Present
(Def
));
2075 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
2076 Set_Has_Delayed_Freeze
(Id
, True);
2078 -- Create a class-wide type with the same attributes
2080 Make_Class_Wide_Type
(Id
);
2082 elsif Abstract_Present
(Def
) then
2083 Error_Msg_N
("only a tagged type can be abstract", N
);
2085 end New_Private_Type
;
2087 ----------------------------
2088 -- Uninstall_Declarations --
2089 ----------------------------
2091 procedure Uninstall_Declarations
(P
: Entity_Id
) is
2092 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
2095 Priv_Elmt
: Elmt_Id
;
2096 Priv_Sub
: Entity_Id
;
2098 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
2099 -- Copy to the private declaration the attributes of the full view that
2100 -- need to be available for the partial view also.
2102 function Type_In_Use
(T
: Entity_Id
) return Boolean;
2103 -- Check whether type or base type appear in an active use_type clause
2105 ------------------------------
2106 -- Preserve_Full_Attributes --
2107 ------------------------------
2109 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
2110 Priv_Is_Base_Type
: constant Boolean := Is_Base_Type
(Priv
);
2113 Set_Size_Info
(Priv
, (Full
));
2114 Set_RM_Size
(Priv
, RM_Size
(Full
));
2115 Set_Size_Known_At_Compile_Time
2116 (Priv
, Size_Known_At_Compile_Time
(Full
));
2117 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
2118 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
2119 Set_Is_Ada_2005_Only
(Priv
, Is_Ada_2005_Only
(Full
));
2120 Set_Is_Ada_2012_Only
(Priv
, Is_Ada_2012_Only
(Full
));
2121 Set_Has_Pragma_Unmodified
(Priv
, Has_Pragma_Unmodified
(Full
));
2122 Set_Has_Pragma_Unreferenced
(Priv
, Has_Pragma_Unreferenced
(Full
));
2123 Set_Has_Pragma_Unreferenced_Objects
2124 (Priv
, Has_Pragma_Unreferenced_Objects
2126 if Is_Unchecked_Union
(Full
) then
2127 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
2129 -- Why is atomic not copied here ???
2131 if Referenced
(Full
) then
2132 Set_Referenced
(Priv
);
2135 if Priv_Is_Base_Type
then
2136 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
2137 Set_Finalize_Storage_Only
(Priv
, Finalize_Storage_Only
2138 (Base_Type
(Full
)));
2139 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
2140 Set_Has_Controlled_Component
(Priv
, Has_Controlled_Component
2141 (Base_Type
(Full
)));
2144 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
2146 if Is_Tagged_Type
(Priv
)
2147 and then Is_Tagged_Type
(Full
)
2148 and then not Error_Posted
(Full
)
2150 if Is_Tagged_Type
(Priv
) then
2152 -- If the type is tagged, the tag itself must be available on
2153 -- the partial view, for expansion purposes.
2155 Set_First_Entity
(Priv
, First_Entity
(Full
));
2157 -- If there are discriminants in the partial view, these remain
2158 -- visible. Otherwise only the tag itself is visible, and there
2159 -- are no nameable components in the partial view.
2161 if No
(Last_Entity
(Priv
)) then
2162 Set_Last_Entity
(Priv
, First_Entity
(Priv
));
2166 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
2168 if Has_Discriminants
(Full
) then
2169 Set_Discriminant_Constraint
(Priv
,
2170 Discriminant_Constraint
(Full
));
2173 end Preserve_Full_Attributes
;
2179 function Type_In_Use
(T
: Entity_Id
) return Boolean is
2181 return Scope
(Base_Type
(T
)) = P
2182 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
2185 -- Start of processing for Uninstall_Declarations
2188 Id
:= First_Entity
(P
);
2189 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2190 if Debug_Flag_E
then
2191 Write_Str
("unlinking visible entity ");
2192 Write_Int
(Int
(Id
));
2196 -- On exit from the package scope, we must preserve the visibility
2197 -- established by use clauses in the current scope. Two cases:
2199 -- a) If the entity is an operator, it may be a primitive operator of
2200 -- a type for which there is a visible use-type clause.
2202 -- b) for other entities, their use-visibility is determined by a
2203 -- visible use clause for the package itself. For a generic instance,
2204 -- the instantiation of the formals appears in the visible part,
2205 -- but the formals are private and remain so.
2207 if Ekind
(Id
) = E_Function
2208 and then Is_Operator_Symbol_Name
(Chars
(Id
))
2209 and then not Is_Hidden
(Id
)
2210 and then not Error_Posted
(Id
)
2212 Set_Is_Potentially_Use_Visible
(Id
,
2214 or else Type_In_Use
(Etype
(Id
))
2215 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
2216 or else (Present
(Next_Formal
(First_Formal
(Id
)))
2219 (Etype
(Next_Formal
(First_Formal
(Id
))))));
2221 if In_Use
(P
) and then not Is_Hidden
(Id
) then
2223 -- A child unit of a use-visible package remains use-visible
2224 -- only if it is itself a visible child unit. Otherwise it
2225 -- would remain visible in other contexts where P is use-
2226 -- visible, because once compiled it stays in the entity list
2227 -- of its parent unit.
2229 if Is_Child_Unit
(Id
) then
2230 Set_Is_Potentially_Use_Visible
(Id
,
2231 Is_Visible_Child_Unit
(Id
));
2233 Set_Is_Potentially_Use_Visible
(Id
);
2237 Set_Is_Potentially_Use_Visible
(Id
, False);
2241 -- Local entities are not immediately visible outside of the package
2243 Set_Is_Immediately_Visible
(Id
, False);
2245 -- If this is a private type with a full view (for example a local
2246 -- subtype of a private type declared elsewhere), ensure that the
2247 -- full view is also removed from visibility: it may be exposed when
2248 -- swapping views in an instantiation.
2251 and then Present
(Full_View
(Id
))
2253 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
2256 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2257 Check_Abstract_Overriding
(Id
);
2258 Check_Conventions
(Id
);
2261 if (Ekind
(Id
) = E_Private_Type
2262 or else Ekind
(Id
) = E_Limited_Private_Type
)
2263 and then No
(Full_View
(Id
))
2264 and then not Is_Generic_Type
(Id
)
2265 and then not Is_Derived_Type
(Id
)
2267 Error_Msg_N
("missing full declaration for private type&", Id
);
2269 elsif Ekind
(Id
) = E_Record_Type_With_Private
2270 and then not Is_Generic_Type
(Id
)
2271 and then No
(Full_View
(Id
))
2273 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
2274 Error_Msg_N
("missing full declaration for private type&", Id
);
2277 ("missing full declaration for private extension", Id
);
2280 -- Case of constant, check for deferred constant declaration with
2281 -- no full view. Likely just a matter of a missing expression, or
2282 -- accidental use of the keyword constant.
2284 elsif Ekind
(Id
) = E_Constant
2286 -- OK if constant value present
2288 and then No
(Constant_Value
(Id
))
2290 -- OK if full view present
2292 and then No
(Full_View
(Id
))
2294 -- OK if imported, since that provides the completion
2296 and then not Is_Imported
(Id
)
2298 -- OK if object declaration replaced by renaming declaration as
2299 -- a result of OK_To_Rename processing (e.g. for concatenation)
2301 and then Nkind
(Parent
(Id
)) /= N_Object_Renaming_Declaration
2303 -- OK if object declaration with the No_Initialization flag set
2305 and then not (Nkind
(Parent
(Id
)) = N_Object_Declaration
2306 and then No_Initialization
(Parent
(Id
)))
2308 -- If no private declaration is present, we assume the user did
2309 -- not intend a deferred constant declaration and the problem
2310 -- is simply that the initializing expression is missing.
2312 if not Has_Private_Declaration
(Etype
(Id
)) then
2314 -- We assume that the user did not intend a deferred constant
2315 -- declaration, and the expression is just missing.
2318 ("constant declaration requires initialization expression",
2321 if Is_Limited_Type
(Etype
(Id
)) then
2323 ("\if variable intended, remove CONSTANT from declaration",
2327 -- Otherwise if a private declaration is present, then we are
2328 -- missing the full declaration for the deferred constant.
2332 ("missing full declaration for deferred constant (RM 7.4)",
2335 if Is_Limited_Type
(Etype
(Id
)) then
2337 ("\if variable intended, remove CONSTANT from declaration",
2346 -- If the specification was installed as the parent of a public child
2347 -- unit, the private declarations were not installed, and there is
2350 if not In_Private_Part
(P
) then
2353 Set_In_Private_Part
(P
, False);
2356 -- Make private entities invisible and exchange full and private
2357 -- declarations for private types. Id is now the first private entity
2360 while Present
(Id
) loop
2361 if Debug_Flag_E
then
2362 Write_Str
("unlinking private entity ");
2363 Write_Int
(Int
(Id
));
2367 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2368 Check_Abstract_Overriding
(Id
);
2369 Check_Conventions
(Id
);
2372 Set_Is_Immediately_Visible
(Id
, False);
2374 if Is_Private_Base_Type
(Id
)
2375 and then Present
(Full_View
(Id
))
2377 Full
:= Full_View
(Id
);
2379 -- If the partial view is not declared in the visible part of the
2380 -- package (as is the case when it is a type derived from some
2381 -- other private type in the private part of the current package),
2382 -- no exchange takes place.
2385 or else List_Containing
(Parent
(Id
))
2386 /= Visible_Declarations
(Specification
(Decl
))
2391 -- The entry in the private part points to the full declaration,
2392 -- which is currently visible. Exchange them so only the private
2393 -- type declaration remains accessible, and link private and full
2394 -- declaration in the opposite direction. Before the actual
2395 -- exchange, we copy back attributes of the full view that must
2396 -- be available to the partial view too.
2398 Preserve_Full_Attributes
(Id
, Full
);
2400 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
2402 if Is_Indefinite_Subtype
(Full
)
2403 and then not Is_Indefinite_Subtype
(Id
)
2406 ("full view of type must be definite subtype", Full
);
2409 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2411 -- Swap out the subtypes and derived types of Id that were
2412 -- compiled in this scope, or installed previously by
2413 -- Install_Private_Declarations.
2415 -- Before we do the swap, we verify the presence of the Full_View
2416 -- field which may be empty due to a swap by a previous call to
2417 -- End_Package_Scope (e.g. from the freezing mechanism).
2419 while Present
(Priv_Elmt
) loop
2420 Priv_Sub
:= Node
(Priv_Elmt
);
2422 if Present
(Full_View
(Priv_Sub
)) then
2424 if Scope
(Priv_Sub
) = P
2425 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
2427 Set_Is_Immediately_Visible
(Priv_Sub
, False);
2430 if Is_Visible_Dependent
(Priv_Sub
) then
2431 Preserve_Full_Attributes
2432 (Priv_Sub
, Full_View
(Priv_Sub
));
2433 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
2434 Exchange_Declarations
(Priv_Sub
);
2438 Next_Elmt
(Priv_Elmt
);
2441 -- Now restore the type itself to its private view
2443 Exchange_Declarations
(Id
);
2445 -- If we have installed an underlying full view for a type derived
2446 -- from a private type in a child unit, restore the proper views
2447 -- of private and full view. See corresponding code in
2448 -- Install_Private_Declarations.
2450 -- After the exchange, Full denotes the private type in the
2451 -- visible part of the package.
2453 if Is_Private_Base_Type
(Full
)
2454 and then Present
(Full_View
(Full
))
2455 and then Present
(Underlying_Full_View
(Full
))
2456 and then In_Package_Body
(Current_Scope
)
2458 Set_Full_View
(Full
, Underlying_Full_View
(Full
));
2459 Set_Underlying_Full_View
(Full
, Empty
);
2462 elsif Ekind
(Id
) = E_Incomplete_Type
2463 and then Comes_From_Source
(Id
)
2464 and then No
(Full_View
(Id
))
2466 -- Mark Taft amendment types. Verify that there are no primitive
2467 -- operations declared for the type (3.10.1(9)).
2469 Set_Has_Completion_In_Body
(Id
);
2476 Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2477 while Present
(Elmt
) loop
2478 Subp
:= Node
(Elmt
);
2480 -- Is_Primitive is tested because there can be cases where
2481 -- nonprimitive subprograms (in nested packages) are added
2482 -- to the Private_Dependents list.
2484 if Is_Overloadable
(Subp
) and then Is_Primitive
(Subp
) then
2486 ("type& must be completed in the private part",
2489 -- The result type of an access-to-function type cannot be a
2490 -- Taft-amendment type, unless the version is Ada 2012 or
2491 -- later (see AI05-151).
2493 elsif Ada_Version
< Ada_2012
2494 and then Ekind
(Subp
) = E_Subprogram_Type
2496 if Etype
(Subp
) = Id
2498 (Is_Class_Wide_Type
(Etype
(Subp
))
2499 and then Etype
(Etype
(Subp
)) = Id
)
2502 ("type& must be completed in the private part",
2503 Associated_Node_For_Itype
(Subp
), Id
);
2511 elsif not Is_Child_Unit
(Id
)
2512 and then (not Is_Private_Type
(Id
)
2513 or else No
(Full_View
(Id
)))
2516 Set_Is_Potentially_Use_Visible
(Id
, False);
2522 end Uninstall_Declarations
;
2524 ------------------------
2525 -- Unit_Requires_Body --
2526 ------------------------
2528 function Unit_Requires_Body
(P
: Entity_Id
) return Boolean is
2532 -- Imported entity never requires body. Right now, only subprograms can
2533 -- be imported, but perhaps in the future we will allow import of
2536 if Is_Imported
(P
) then
2539 -- Body required if library package with pragma Elaborate_Body
2541 elsif Has_Pragma_Elaborate_Body
(P
) then
2544 -- Body required if subprogram
2546 elsif Is_Subprogram
(P
) or else Is_Generic_Subprogram
(P
) then
2549 -- Treat a block as requiring a body
2551 elsif Ekind
(P
) = E_Block
then
2554 elsif Ekind
(P
) = E_Package
2555 and then Nkind
(Parent
(P
)) = N_Package_Specification
2556 and then Present
(Generic_Parent
(Parent
(P
)))
2559 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(P
));
2561 if Has_Pragma_Elaborate_Body
(G_P
) then
2567 -- Otherwise search entity chain for entity requiring completion
2569 E
:= First_Entity
(P
);
2570 while Present
(E
) loop
2572 -- Always ignore child units. Child units get added to the entity
2573 -- list of a parent unit, but are not original entities of the
2574 -- parent, and so do not affect whether the parent needs a body.
2576 if Is_Child_Unit
(E
) then
2579 -- Ignore formal packages and their renamings
2581 elsif Ekind
(E
) = E_Package
2582 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
2583 N_Formal_Package_Declaration
2587 -- Otherwise test to see if entity requires a completion.
2588 -- Note that subprogram entities whose declaration does not come
2589 -- from source are ignored here on the basis that we assume the
2590 -- expander will provide an implicit completion at some point.
2592 elsif (Is_Overloadable
(E
)
2593 and then Ekind
(E
) /= E_Enumeration_Literal
2594 and then Ekind
(E
) /= E_Operator
2595 and then not Is_Abstract_Subprogram
(E
)
2596 and then not Has_Completion
(E
)
2597 and then Comes_From_Source
(Parent
(E
)))
2600 (Ekind
(E
) = E_Package
2602 and then not Has_Completion
(E
)
2603 and then Unit_Requires_Body
(E
))
2606 (Ekind
(E
) = E_Incomplete_Type
2607 and then No
(Full_View
(E
))
2608 and then not Is_Generic_Type
(E
))
2611 ((Ekind
(E
) = E_Task_Type
or else
2612 Ekind
(E
) = E_Protected_Type
)
2613 and then not Has_Completion
(E
))
2616 (Ekind
(E
) = E_Generic_Package
and then E
/= P
2617 and then not Has_Completion
(E
)
2618 and then Unit_Requires_Body
(E
))
2621 (Is_Generic_Subprogram
(E
)
2622 and then not Has_Completion
(E
))
2627 -- Entity that does not require completion
2637 end Unit_Requires_Body
;