1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2011, 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_In
(N
, N_Procedure_Call_Statement
, N_Function_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 not Has_Referencer_Except_For_Subprograms
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.
653 if Is_Generic_Unit
(E
) then
656 -- For non-generic package body, recurse into body unless
657 -- this is an instance, we ignore instances since they
658 -- cannot have references that affect outer entities.
660 elsif not Is_Generic_Instance
(E
) then
662 (Declarations
(D
), Outer
=> False)
668 -- Processing for package specs, recurse into declarations.
669 -- Again we skip this for the case of generic instances.
671 elsif K
= N_Package_Declaration
672 and then not Has_Referencer_Except_For_Subprograms
674 S
:= Specification
(D
);
676 if not Is_Generic_Unit
(Defining_Entity
(S
)) then
678 (Private_Declarations
(S
), Outer
=> False)
682 (Visible_Declarations
(S
), Outer
=> False)
688 -- Objects and exceptions need not be public if we have not
689 -- encountered a referencer so far. We only reset the flag
690 -- for outer level entities that are not imported/exported,
691 -- and which have no interface name.
693 elsif Nkind_In
(K
, N_Object_Declaration
,
694 N_Exception_Declaration
,
695 N_Subprogram_Declaration
)
697 E
:= Defining_Entity
(D
);
700 and then (not Has_Referencer_Except_For_Subprograms
701 or else K
= N_Subprogram_Declaration
)
702 and then not Is_Imported
(E
)
703 and then not Is_Exported
(E
)
704 and then No
(Interface_Name
(E
))
706 Set_Is_Public
(E
, False);
713 return Has_Referencer_Except_For_Subprograms
;
716 -- Start of processing for Make_Non_Public_Where_Possible
721 pragma Warnings
(Off
, Discard
);
724 Discard
:= Has_Referencer
(Declarations
(N
), Outer
=> True);
726 end Make_Non_Public_Where_Possible
;
729 -- If expander is not active, then here is where we turn off the
730 -- In_Package_Body flag, otherwise it is turned off at the end of the
731 -- corresponding expansion routine. If this is an instance body, we need
732 -- to qualify names of local entities, because the body may have been
733 -- compiled as a preliminary to another instantiation.
735 if not Expander_Active
then
736 Set_In_Package_Body
(Spec_Id
, False);
738 if Is_Generic_Instance
(Spec_Id
)
739 and then Operating_Mode
= Generate_Code
741 Qualify_Entity_Names
(N
);
744 end Analyze_Package_Body_Helper
;
746 ---------------------------------
747 -- Analyze_Package_Declaration --
748 ---------------------------------
750 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
751 Id
: constant Node_Id
:= Defining_Entity
(N
);
754 -- True when in the context of a declared pure library unit
756 Body_Required
: Boolean;
757 -- True when this package declaration requires a corresponding body
760 -- True when this package declaration is not a nested declaration
763 -- Analye aspect specifications immediately, since we need to recognize
764 -- things like Pure early enough to diagnose violations during analysis.
766 if Has_Aspects
(N
) then
767 Analyze_Aspect_Specifications
(N
, Id
);
770 -- Ada 2005 (AI-217): Check if the package has been erroneously named
771 -- in a limited-with clause of its own context. In this case the error
772 -- has been previously notified by Analyze_Context.
774 -- limited with Pkg; -- ERROR
775 -- package Pkg is ...
777 if From_With_Type
(Id
) then
782 Write_Str
("==> package spec ");
783 Write_Name
(Chars
(Id
));
784 Write_Str
(" from ");
785 Write_Location
(Sloc
(N
));
790 Generate_Definition
(Id
);
792 Set_Ekind
(Id
, E_Package
);
793 Set_Etype
(Id
, Standard_Void_Type
);
797 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
798 Set_Is_Pure
(Id
, PF
);
800 Set_Categorization_From_Pragmas
(N
);
802 Analyze
(Specification
(N
));
803 Validate_Categorization_Dependency
(N
, Id
);
805 Body_Required
:= Unit_Requires_Body
(Id
);
807 -- When this spec does not require an explicit body, we know that there
808 -- are no entities requiring completion in the language sense; we call
809 -- Check_Completion here only to ensure that any nested package
810 -- declaration that requires an implicit body gets one. (In the case
811 -- where a body is required, Check_Completion is called at the end of
812 -- the body's declarative part.)
814 if not Body_Required
then
818 Comp_Unit
:= Nkind
(Parent
(N
)) = N_Compilation_Unit
;
821 -- Set Body_Required indication on the compilation unit node, and
822 -- determine whether elaboration warnings may be meaningful on it.
824 Set_Body_Required
(Parent
(N
), Body_Required
);
826 if not Body_Required
then
827 Set_Suppress_Elaboration_Warnings
(Id
);
832 End_Package_Scope
(Id
);
834 -- For the declaration of a library unit that is a remote types package,
835 -- check legality rules regarding availability of stream attributes for
836 -- types that contain non-remote access values. This subprogram performs
837 -- visibility tests that rely on the fact that we have exited the scope
841 Validate_RT_RAT_Component
(N
);
846 Write_Str
("<== package spec ");
847 Write_Name
(Chars
(Id
));
848 Write_Str
(" from ");
849 Write_Location
(Sloc
(N
));
852 end Analyze_Package_Declaration
;
854 -----------------------------------
855 -- Analyze_Package_Specification --
856 -----------------------------------
858 -- Note that this code is shared for the analysis of generic package specs
859 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
861 procedure Analyze_Package_Specification
(N
: Node_Id
) is
862 Id
: constant Entity_Id
:= Defining_Entity
(N
);
863 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
864 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
865 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
868 Public_Child
: Boolean;
870 Private_With_Clauses_Installed
: Boolean := False;
871 -- In Ada 2005, private with_clauses are visible in the private part
872 -- of a nested package, even if it appears in the public part of the
873 -- enclosing package. This requires a separate step to install these
874 -- private_with_clauses, and remove them at the end of the nested
877 procedure Check_One_Tagged_Type_Or_Extension_At_Most
;
878 -- Issue an error in SPARK mode if a package specification contains
879 -- more than one tagged type or type extension.
881 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
882 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
883 -- Is_True_Constant) on all variables that are entities of Id, and on
884 -- the chain whose first element is FE. A recursive call is made for all
885 -- packages and generic packages.
887 procedure Generate_Parent_References
;
888 -- For a child unit, generate references to parent units, for
889 -- GPS navigation purposes.
891 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
892 -- Child and Unit are entities of compilation units. True if Child
893 -- is a public child of Parent as defined in 10.1.1
895 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
896 -- Detects all incomplete or private type declarations having a known
897 -- discriminant part that are completed by an Unchecked_Union. Emits
898 -- the error message "Unchecked_Union may not complete discriminated
901 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
902 -- Given the package entity of a generic package instantiation or
903 -- formal package whose corresponding generic is a child unit, installs
904 -- the private declarations of each of the child unit's parents.
905 -- This has to be done at the point of entering the instance package's
906 -- private part rather than being done in Sem_Ch12.Install_Parent
907 -- (which is where the parents' visible declarations are installed).
909 ------------------------------------------------
910 -- Check_One_Tagged_Type_Or_Extension_At_Most --
911 ------------------------------------------------
913 procedure Check_One_Tagged_Type_Or_Extension_At_Most
is
916 procedure Check_Decls
(Decls
: List_Id
);
917 -- Check that either Previous is Empty and Decls does not contain
918 -- more than one tagged type or type extension, or Previous is
919 -- already set and Decls contains no tagged type or type extension.
925 procedure Check_Decls
(Decls
: List_Id
) is
929 Decl
:= First
(Decls
);
930 while Present
(Decl
) loop
931 if Nkind
(Decl
) = N_Full_Type_Declaration
932 and then Is_Tagged_Type
(Defining_Identifier
(Decl
))
934 if No
(Previous
) then
938 Error_Msg_Sloc
:= Sloc
(Previous
);
939 Check_SPARK_Restriction
940 ("at most one tagged type or type extension allowed",
941 "\\ previous declaration#",
950 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
954 Check_Decls
(Vis_Decls
);
956 if Present
(Priv_Decls
) then
957 Check_Decls
(Priv_Decls
);
959 end Check_One_Tagged_Type_Or_Extension_At_Most
;
961 ---------------------
962 -- Clear_Constants --
963 ---------------------
965 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
969 -- Ignore package renamings, not interesting and they can cause self
970 -- referential loops in the code below.
972 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
976 -- Note: in the loop below, the check for Next_Entity pointing back
977 -- to the package entity may seem odd, but it is needed, because a
978 -- package can contain a renaming declaration to itself, and such
979 -- renamings are generated automatically within package instances.
982 while Present
(E
) and then E
/= Id
loop
983 if Is_Assignable
(E
) then
984 Set_Never_Set_In_Source
(E
, False);
985 Set_Is_True_Constant
(E
, False);
986 Set_Current_Value
(E
, Empty
);
987 Set_Is_Known_Null
(E
, False);
988 Set_Last_Assignment
(E
, Empty
);
990 if not Can_Never_Be_Null
(E
) then
991 Set_Is_Known_Non_Null
(E
, False);
994 elsif Is_Package_Or_Generic_Package
(E
) then
995 Clear_Constants
(E
, First_Entity
(E
));
996 Clear_Constants
(E
, First_Private_Entity
(E
));
1001 end Clear_Constants
;
1003 --------------------------------
1004 -- Generate_Parent_References --
1005 --------------------------------
1007 procedure Generate_Parent_References
is
1008 Decl
: constant Node_Id
:= Parent
(N
);
1011 if Id
= Cunit_Entity
(Main_Unit
)
1012 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
1014 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1016 elsif not Nkind_In
(Unit
(Cunit
(Main_Unit
)), N_Subprogram_Body
,
1019 -- If current unit is an ancestor of main unit, generate a
1020 -- reference to its own parent.
1024 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
1027 if Nkind
(Main_Spec
) = N_Package_Body
then
1028 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
1031 U
:= Parent_Spec
(Main_Spec
);
1032 while Present
(U
) loop
1033 if U
= Parent
(Decl
) then
1034 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1037 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
1041 U
:= Parent_Spec
(Unit
(U
));
1046 end Generate_Parent_References
;
1048 ---------------------
1049 -- Is_Public_Child --
1050 ---------------------
1052 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
1054 if not Is_Private_Descendant
(Child
) then
1057 if Child
= Unit
then
1058 return not Private_Present
(
1059 Parent
(Unit_Declaration_Node
(Child
)));
1061 return Is_Public_Child
(Scope
(Child
), Unit
);
1064 end Is_Public_Child
;
1066 ----------------------------------------
1067 -- Inspect_Unchecked_Union_Completion --
1068 ----------------------------------------
1070 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
1074 Decl
:= First
(Decls
);
1075 while Present
(Decl
) loop
1077 -- We are looking at an incomplete or private type declaration
1078 -- with a known_discriminant_part whose full view is an
1081 if Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
1082 N_Private_Type_Declaration
)
1083 and then Has_Discriminants
(Defining_Identifier
(Decl
))
1084 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
1086 Is_Unchecked_Union
(Full_View
(Defining_Identifier
(Decl
)))
1089 ("completion of discriminated partial view "
1090 & "cannot be an Unchecked_Union",
1091 Full_View
(Defining_Identifier
(Decl
)));
1096 end Inspect_Unchecked_Union_Completion
;
1098 -----------------------------------------
1099 -- Install_Parent_Private_Declarations --
1100 -----------------------------------------
1102 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
1103 Inst_Par
: Entity_Id
;
1104 Gen_Par
: Entity_Id
;
1105 Inst_Node
: Node_Id
;
1108 Inst_Par
:= Inst_Id
;
1111 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
1112 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
1113 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
1115 if Nkind_In
(Inst_Node
, N_Package_Instantiation
,
1116 N_Formal_Package_Declaration
)
1117 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
1119 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
1121 if Present
(Renamed_Entity
(Inst_Par
)) then
1122 Inst_Par
:= Renamed_Entity
(Inst_Par
);
1127 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
1129 -- Install the private declarations and private use clauses
1130 -- of a parent instance of the child instance, unless the
1131 -- parent instance private declarations have already been
1132 -- installed earlier in Analyze_Package_Specification, which
1133 -- happens when a generic child is instantiated, and the
1134 -- instance is a child of the parent instance.
1136 -- Installing the use clauses of the parent instance twice
1137 -- is both unnecessary and wrong, because it would cause the
1138 -- clauses to be chained to themselves in the use clauses
1139 -- list of the scope stack entry. That in turn would cause
1140 -- an endless loop from End_Use_Clauses upon scope exit.
1142 -- The parent is now fully visible. It may be a hidden open
1143 -- scope if we are currently compiling some child instance
1144 -- declared within it, but while the current instance is being
1145 -- compiled the parent is immediately visible. In particular
1146 -- its entities must remain visible if a stack save/restore
1147 -- takes place through a call to Rtsfind.
1149 if Present
(Gen_Par
) then
1150 if not In_Private_Part
(Inst_Par
) then
1151 Install_Private_Declarations
(Inst_Par
);
1152 Set_Use
(Private_Declarations
1154 (Unit_Declaration_Node
(Inst_Par
))));
1155 Set_Is_Hidden_Open_Scope
(Inst_Par
, False);
1158 -- If we've reached the end of the generic instance parents,
1159 -- then finish off by looping through the nongeneric parents
1160 -- and installing their private declarations.
1163 while Present
(Inst_Par
)
1164 and then Inst_Par
/= Standard_Standard
1165 and then (not In_Open_Scopes
(Inst_Par
)
1166 or else not In_Private_Part
(Inst_Par
))
1168 Install_Private_Declarations
(Inst_Par
);
1169 Set_Use
(Private_Declarations
1171 (Unit_Declaration_Node
(Inst_Par
))));
1172 Inst_Par
:= Scope
(Inst_Par
);
1182 end Install_Parent_Private_Declarations
;
1184 -- Start of processing for Analyze_Package_Specification
1187 if Present
(Vis_Decls
) then
1188 Analyze_Declarations
(Vis_Decls
);
1191 -- Verify that incomplete types have received full declarations and
1192 -- also build invariant procedures for any types with invariants.
1194 E
:= First_Entity
(Id
);
1195 while Present
(E
) loop
1197 -- Check on incomplete types
1199 -- AI05-0213: A formal incomplete type has no completion
1201 if Ekind
(E
) = E_Incomplete_Type
1202 and then No
(Full_View
(E
))
1203 and then not Is_Generic_Type
(E
)
1205 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
1208 -- Build invariant procedures
1210 if Is_Type
(E
) and then Has_Invariants
(E
) then
1211 Build_Invariant_Procedure
(E
, N
);
1217 if Is_Remote_Call_Interface
(Id
)
1218 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
1220 Validate_RCI_Declarations
(Id
);
1223 -- Save global references in the visible declarations, before installing
1224 -- private declarations of parent unit if there is one, because the
1225 -- privacy status of types defined in the parent will change. This is
1226 -- only relevant for generic child units, but is done in all cases for
1229 if Ekind
(Id
) = E_Generic_Package
1230 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1233 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1234 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1236 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1237 Save_Global_References
(Orig_Decl
);
1238 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1242 -- If package is a public child unit, then make the private declarations
1243 -- of the parent visible.
1245 Public_Child
:= False;
1249 Pack_Decl
: Node_Id
;
1254 Par_Spec
:= Parent_Spec
(Parent
(N
));
1256 -- If the package is formal package of an enclosing generic, it is
1257 -- transformed into a local generic declaration, and compiled to make
1258 -- its spec available. We need to retrieve the original generic to
1259 -- determine whether it is a child unit, and install its parents.
1263 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1265 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1266 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1269 if Present
(Par_Spec
) then
1270 Generate_Parent_References
;
1272 while Scope
(Par
) /= Standard_Standard
1273 and then Is_Public_Child
(Id
, Par
)
1274 and then In_Open_Scopes
(Par
)
1276 Public_Child
:= True;
1278 Install_Private_Declarations
(Par
);
1279 Install_Private_With_Clauses
(Par
);
1280 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1281 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1286 if Is_Compilation_Unit
(Id
) then
1287 Install_Private_With_Clauses
(Id
);
1290 -- The current compilation unit may include private with_clauses,
1291 -- which are visible in the private part of the current nested
1292 -- package, and have to be installed now. This is not done for
1293 -- nested instantiations, where the private with_clauses of the
1294 -- enclosing unit have no effect once the instantiation info is
1295 -- established and we start analyzing the package declaration.
1298 Comp_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
1300 if Is_Package_Or_Generic_Package
(Comp_Unit
)
1301 and then not In_Private_Part
(Comp_Unit
)
1302 and then not In_Instance
1304 Install_Private_With_Clauses
(Comp_Unit
);
1305 Private_With_Clauses_Installed
:= True;
1310 -- If this is a package associated with a generic instance or formal
1311 -- package, then the private declarations of each of the generic's
1312 -- parents must be installed at this point.
1314 if Is_Generic_Instance
(Id
) then
1315 Install_Parent_Private_Declarations
(Id
);
1318 -- Analyze private part if present. The flag In_Private_Part is reset
1319 -- in End_Package_Scope.
1321 L
:= Last_Entity
(Id
);
1323 if Present
(Priv_Decls
) then
1324 Set_In_Private_Part
(Id
);
1326 -- Upon entering a public child's private part, it may be necessary
1327 -- to declare subprograms that were derived in the package's visible
1328 -- part but not yet made visible.
1330 if Public_Child
then
1331 Declare_Inherited_Private_Subprograms
(Id
);
1334 Analyze_Declarations
(Priv_Decls
);
1336 -- Check the private declarations for incomplete deferred constants
1338 Inspect_Deferred_Constant_Completion
(Priv_Decls
);
1340 -- The first private entity is the immediate follower of the last
1341 -- visible entity, if there was one.
1344 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1346 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
1349 -- There may be inherited private subprograms that need to be declared,
1350 -- even in the absence of an explicit private part. If there are any
1351 -- public declarations in the package and the package is a public child
1352 -- unit, then an implicit private part is assumed.
1354 elsif Present
(L
) and then Public_Child
then
1355 Set_In_Private_Part
(Id
);
1356 Declare_Inherited_Private_Subprograms
(Id
);
1357 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1360 E
:= First_Entity
(Id
);
1361 while Present
(E
) loop
1363 -- Check rule of 3.6(11), which in general requires waiting till all
1364 -- full types have been seen.
1366 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1367 Check_Aliased_Component_Types
(E
);
1370 -- Check preelaborable initialization for full type completing a
1371 -- private type for which pragma Preelaborable_Initialization given.
1374 and then Must_Have_Preelab_Init
(E
)
1375 and then not Has_Preelaborable_Initialization
(E
)
1378 ("full view of & does not have preelaborable initialization", E
);
1384 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1385 -- declaration having a known_discriminant_part shall not be an
1386 -- Unchecked_Union type.
1388 if Present
(Vis_Decls
) then
1389 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1392 if Present
(Priv_Decls
) then
1393 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1396 if Ekind
(Id
) = E_Generic_Package
1397 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1398 and then Present
(Priv_Decls
)
1400 -- Save global references in private declarations, ignoring the
1401 -- visible declarations that were processed earlier.
1404 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1405 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1406 Save_Form
: constant List_Id
:=
1407 Generic_Formal_Declarations
(Orig_Decl
);
1410 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1411 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1412 Save_Global_References
(Orig_Decl
);
1413 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1414 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1418 Process_End_Label
(N
, 'e', Id
);
1420 -- Remove private_with_clauses of enclosing compilation unit, if they
1423 if Private_With_Clauses_Installed
then
1424 Remove_Private_With_Clauses
(Cunit
(Current_Sem_Unit
));
1427 -- For the case of a library level package, we must go through all the
1428 -- entities clearing the indications that the value may be constant and
1429 -- not modified. Why? Because any client of this package may modify
1430 -- these values freely from anywhere. This also applies to any nested
1431 -- packages or generic packages.
1433 -- For now we unconditionally clear constants for packages that are
1434 -- instances of generic packages. The reason is that we do not have the
1435 -- body yet, and we otherwise think things are unreferenced when they
1436 -- are not. This should be fixed sometime (the effect is not terrible,
1437 -- we just lose some warnings, and also some cases of value propagation)
1440 if Is_Library_Level_Entity
(Id
)
1441 or else Is_Generic_Instance
(Id
)
1443 Clear_Constants
(Id
, First_Entity
(Id
));
1444 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1447 Check_One_Tagged_Type_Or_Extension_At_Most
;
1448 end Analyze_Package_Specification
;
1450 --------------------------------------
1451 -- Analyze_Private_Type_Declaration --
1452 --------------------------------------
1454 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1455 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1456 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1459 Generate_Definition
(Id
);
1460 Set_Is_Pure
(Id
, PF
);
1461 Init_Size_Align
(Id
);
1463 if not Is_Package_Or_Generic_Package
(Current_Scope
)
1464 or else In_Private_Part
(Current_Scope
)
1466 Error_Msg_N
("invalid context for private declaration", N
);
1469 New_Private_Type
(N
, Id
, N
);
1470 Set_Depends_On_Private
(Id
);
1472 if Has_Aspects
(N
) then
1473 Analyze_Aspect_Specifications
(N
, Id
);
1475 end Analyze_Private_Type_Declaration
;
1477 ----------------------------------
1478 -- Check_Anonymous_Access_Types --
1479 ----------------------------------
1481 procedure Check_Anonymous_Access_Types
1482 (Spec_Id
: Entity_Id
;
1489 -- Itype references are only needed by gigi, to force elaboration of
1490 -- itypes. In the absence of code generation, they are not needed.
1492 if not Expander_Active
then
1496 E
:= First_Entity
(Spec_Id
);
1497 while Present
(E
) loop
1498 if Ekind
(E
) = E_Anonymous_Access_Type
1499 and then From_With_Type
(E
)
1501 IR
:= Make_Itype_Reference
(Sloc
(P_Body
));
1504 if No
(Declarations
(P_Body
)) then
1505 Set_Declarations
(P_Body
, New_List
(IR
));
1507 Prepend
(IR
, Declarations
(P_Body
));
1513 end Check_Anonymous_Access_Types
;
1515 -------------------------------------------
1516 -- Declare_Inherited_Private_Subprograms --
1517 -------------------------------------------
1519 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1521 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1522 -- Check whether an inherited subprogram S is an operation of an
1523 -- untagged derived type T.
1525 ---------------------
1526 -- Is_Primitive_Of --
1527 ---------------------
1529 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1533 -- If the full view is a scalar type, the type is the anonymous base
1534 -- type, but the operation mentions the first subtype, so check the
1535 -- signature against the base type.
1537 if Base_Type
(Etype
(S
)) = Base_Type
(T
) then
1541 Formal
:= First_Formal
(S
);
1542 while Present
(Formal
) loop
1543 if Base_Type
(Etype
(Formal
)) = Base_Type
(T
) then
1547 Next_Formal
(Formal
);
1552 end Is_Primitive_Of
;
1559 Op_Elmt_2
: Elmt_Id
;
1560 Prim_Op
: Entity_Id
;
1561 New_Op
: Entity_Id
:= Empty
;
1562 Parent_Subp
: Entity_Id
;
1565 -- Start of processing for Declare_Inherited_Private_Subprograms
1568 E
:= First_Entity
(Id
);
1569 while Present
(E
) loop
1571 -- If the entity is a nonprivate type extension whose parent type
1572 -- is declared in an open scope, then the type may have inherited
1573 -- operations that now need to be made visible. Ditto if the entity
1574 -- is a formal derived type in a child unit.
1576 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1578 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1579 and then Is_Generic_Type
(E
)))
1580 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1581 and then Is_Base_Type
(E
)
1583 if Is_Tagged_Type
(E
) then
1584 Op_List
:= Primitive_Operations
(E
);
1586 Tag
:= First_Tag_Component
(E
);
1588 Op_Elmt
:= First_Elmt
(Op_List
);
1589 while Present
(Op_Elmt
) loop
1590 Prim_Op
:= Node
(Op_Elmt
);
1592 -- Search primitives that are implicit operations with an
1593 -- internal name whose parent operation has a normal name.
1595 if Present
(Alias
(Prim_Op
))
1596 and then Find_Dispatching_Type
(Alias
(Prim_Op
)) /= E
1597 and then not Comes_From_Source
(Prim_Op
)
1598 and then Is_Internal_Name
(Chars
(Prim_Op
))
1599 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1601 Parent_Subp
:= Alias
(Prim_Op
);
1603 -- Case 1: Check if the type has also an explicit
1604 -- overriding for this primitive.
1606 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1607 while Present
(Op_Elmt_2
) loop
1609 -- Skip entities with attribute Interface_Alias since
1610 -- they are not overriding primitives (these entities
1611 -- link an interface primitive with their covering
1614 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
1615 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
1616 and then No
(Interface_Alias
(Node
(Op_Elmt_2
)))
1618 -- The private inherited operation has been
1619 -- overridden by an explicit subprogram: replace
1620 -- the former by the latter.
1622 New_Op
:= Node
(Op_Elmt_2
);
1623 Replace_Elmt
(Op_Elmt
, New_Op
);
1624 Remove_Elmt
(Op_List
, Op_Elmt_2
);
1625 Set_Overridden_Operation
(New_Op
, Parent_Subp
);
1627 -- We don't need to inherit its dispatching slot.
1628 -- Set_All_DT_Position has previously ensured that
1629 -- the same slot was assigned to the two primitives
1632 and then Present
(DTC_Entity
(New_Op
))
1633 and then Present
(DTC_Entity
(Prim_Op
))
1635 pragma Assert
(DT_Position
(New_Op
)
1636 = DT_Position
(Prim_Op
));
1640 goto Next_Primitive
;
1643 Next_Elmt
(Op_Elmt_2
);
1646 -- Case 2: We have not found any explicit overriding and
1647 -- hence we need to declare the operation (i.e., make it
1650 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1652 -- Inherit the dispatching slot if E is already frozen
1655 and then Present
(DTC_Entity
(Alias
(Prim_Op
)))
1657 Set_DTC_Entity_Value
(E
, New_Op
);
1658 Set_DT_Position
(New_Op
,
1659 DT_Position
(Alias
(Prim_Op
)));
1663 (Is_Dispatching_Operation
(New_Op
)
1664 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
1666 -- Substitute the new operation for the old one in the
1667 -- type's primitive operations list. Since the new
1668 -- operation was also just added to the end of list,
1669 -- the last element must be removed.
1671 -- (Question: is there a simpler way of declaring the
1672 -- operation, say by just replacing the name of the
1673 -- earlier operation, reentering it in the in the symbol
1674 -- table (how?), and marking it as private???)
1676 Replace_Elmt
(Op_Elmt
, New_Op
);
1677 Remove_Last_Elmt
(Op_List
);
1681 Next_Elmt
(Op_Elmt
);
1684 -- Generate listing showing the contents of the dispatch table
1686 if Debug_Flag_ZZ
then
1691 -- Non-tagged type, scan forward to locate inherited hidden
1694 Prim_Op
:= Next_Entity
(E
);
1695 while Present
(Prim_Op
) loop
1696 if Is_Subprogram
(Prim_Op
)
1697 and then Present
(Alias
(Prim_Op
))
1698 and then not Comes_From_Source
(Prim_Op
)
1699 and then Is_Internal_Name
(Chars
(Prim_Op
))
1700 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1701 and then Is_Primitive_Of
(E
, Prim_Op
)
1703 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1706 Next_Entity
(Prim_Op
);
1713 end Declare_Inherited_Private_Subprograms
;
1715 -----------------------
1716 -- End_Package_Scope --
1717 -----------------------
1719 procedure End_Package_Scope
(P
: Entity_Id
) is
1721 Uninstall_Declarations
(P
);
1723 end End_Package_Scope
;
1725 ---------------------------
1726 -- Exchange_Declarations --
1727 ---------------------------
1729 procedure Exchange_Declarations
(Id
: Entity_Id
) is
1730 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
1731 H1
: constant Entity_Id
:= Homonym
(Id
);
1732 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
1737 -- If missing full declaration for type, nothing to exchange
1739 if No
(Full_Id
) then
1743 -- Otherwise complete the exchange, and preserve semantic links
1745 Next2
:= Next_Entity
(Full_Id
);
1746 H2
:= Homonym
(Full_Id
);
1748 -- Reset full declaration pointer to reflect the switched entities and
1749 -- readjust the next entity chains.
1751 Exchange_Entities
(Id
, Full_Id
);
1753 Set_Next_Entity
(Id
, Next1
);
1754 Set_Homonym
(Id
, H1
);
1756 Set_Full_View
(Full_Id
, Id
);
1757 Set_Next_Entity
(Full_Id
, Next2
);
1758 Set_Homonym
(Full_Id
, H2
);
1759 end Exchange_Declarations
;
1761 ----------------------------
1762 -- Install_Package_Entity --
1763 ----------------------------
1765 procedure Install_Package_Entity
(Id
: Entity_Id
) is
1767 if not Is_Internal
(Id
) then
1768 if Debug_Flag_E
then
1769 Write_Str
("Install: ");
1770 Write_Name
(Chars
(Id
));
1774 if not Is_Child_Unit
(Id
) then
1775 Set_Is_Immediately_Visible
(Id
);
1779 end Install_Package_Entity
;
1781 ----------------------------------
1782 -- Install_Private_Declarations --
1783 ----------------------------------
1785 procedure Install_Private_Declarations
(P
: Entity_Id
) is
1787 Priv_Elmt
: Elmt_Id
;
1792 -- First exchange declarations for private types, so that the full
1793 -- declaration is visible. For each private type, we check its
1794 -- Private_Dependents list and also exchange any subtypes of or derived
1795 -- types from it. Finally, if this is a Taft amendment type, the
1796 -- incomplete declaration is irrelevant, and we want to link the
1797 -- eventual full declaration with the original private one so we also
1798 -- skip the exchange.
1800 Id
:= First_Entity
(P
);
1801 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1802 if Is_Private_Base_Type
(Id
)
1803 and then Comes_From_Source
(Full_View
(Id
))
1804 and then Present
(Full_View
(Id
))
1805 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
1806 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
1808 -- If there is a use-type clause on the private type, set the
1809 -- full view accordingly.
1811 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
1812 Full
:= Full_View
(Id
);
1814 if Is_Private_Base_Type
(Full
)
1815 and then Has_Private_Declaration
(Full
)
1816 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
1817 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
1818 and then In_Package_Body
(Current_Scope
)
1819 and then not Is_Private_Type
(Etype
(Full
))
1821 -- This is the completion of a private type by a derivation
1822 -- from another private type which is not private anymore. This
1823 -- can only happen in a package nested within a child package,
1824 -- when the parent type is defined in the parent unit. At this
1825 -- point the current type is not private either, and we have to
1826 -- install the underlying full view, which is now visible. Save
1827 -- the current full view as well, so that all views can be
1828 -- restored on exit. It may seem that after compiling the child
1829 -- body there are not environments to restore, but the back-end
1830 -- expects those links to be valid, and freeze nodes depend on
1833 if No
(Full_View
(Full
))
1834 and then Present
(Underlying_Full_View
(Full
))
1836 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
1837 Set_Underlying_Full_View
(Id
, Full
);
1839 Set_Underlying_Full_View
(Full
, Empty
);
1840 Set_Is_Frozen
(Full_View
(Id
));
1844 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1846 Exchange_Declarations
(Id
);
1847 Set_Is_Immediately_Visible
(Id
);
1849 while Present
(Priv_Elmt
) loop
1850 Priv
:= Node
(Priv_Elmt
);
1852 -- Before the exchange, verify that the presence of the
1853 -- Full_View field. It will be empty if the entity has already
1854 -- been installed due to a previous call.
1856 if Present
(Full_View
(Priv
))
1857 and then Is_Visible_Dependent
(Priv
)
1860 -- For each subtype that is swapped, we also swap the
1861 -- reference to it in Private_Dependents, to allow access
1862 -- to it when we swap them out in End_Package_Scope.
1864 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
1865 Exchange_Declarations
(Priv
);
1866 Set_Is_Immediately_Visible
1867 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
1868 Set_Is_Potentially_Use_Visible
1869 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
1872 Next_Elmt
(Priv_Elmt
);
1879 -- Next make other declarations in the private part visible as well
1881 Id
:= First_Private_Entity
(P
);
1882 while Present
(Id
) loop
1883 Install_Package_Entity
(Id
);
1884 Set_Is_Hidden
(Id
, False);
1888 -- Indicate that the private part is currently visible, so it can be
1889 -- properly reset on exit.
1891 Set_In_Private_Part
(P
);
1892 end Install_Private_Declarations
;
1894 ----------------------------------
1895 -- Install_Visible_Declarations --
1896 ----------------------------------
1898 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
1900 Last_Entity
: Entity_Id
;
1904 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
1906 if Is_Package_Or_Generic_Package
(P
) then
1907 Last_Entity
:= First_Private_Entity
(P
);
1909 Last_Entity
:= Empty
;
1912 Id
:= First_Entity
(P
);
1913 while Present
(Id
) and then Id
/= Last_Entity
loop
1914 Install_Package_Entity
(Id
);
1917 end Install_Visible_Declarations
;
1919 --------------------------
1920 -- Is_Private_Base_Type --
1921 --------------------------
1923 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
1925 return Ekind
(E
) = E_Private_Type
1926 or else Ekind
(E
) = E_Limited_Private_Type
1927 or else Ekind
(E
) = E_Record_Type_With_Private
;
1928 end Is_Private_Base_Type
;
1930 --------------------------
1931 -- Is_Visible_Dependent --
1932 --------------------------
1934 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
1936 S
: constant Entity_Id
:= Scope
(Dep
);
1939 -- Renamings created for actual types have the visibility of the actual
1941 if Ekind
(S
) = E_Package
1942 and then Is_Generic_Instance
(S
)
1943 and then (Is_Generic_Actual_Type
(Dep
)
1944 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
1948 elsif not (Is_Derived_Type
(Dep
))
1949 and then Is_Derived_Type
(Full_View
(Dep
))
1951 -- When instantiating a package body, the scope stack is empty, so
1952 -- check instead whether the dependent type is defined in the same
1953 -- scope as the instance itself.
1955 return In_Open_Scopes
(S
)
1956 or else (Is_Generic_Instance
(Current_Scope
)
1957 and then Scope
(Dep
) = Scope
(Current_Scope
));
1961 end Is_Visible_Dependent
;
1963 ----------------------------
1964 -- May_Need_Implicit_Body --
1965 ----------------------------
1967 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
1968 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
1969 S
: constant Node_Id
:= Parent
(P
);
1974 if not Has_Completion
(E
)
1975 and then Nkind
(P
) = N_Package_Declaration
1976 and then (Present
(Activation_Chain_Entity
(P
)) or else Has_RACW
(E
))
1979 Make_Package_Body
(Sloc
(E
),
1980 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
1981 Chars
=> Chars
(E
)),
1982 Declarations
=> New_List
);
1984 if Nkind
(S
) = N_Package_Specification
then
1985 if Present
(Private_Declarations
(S
)) then
1986 Decls
:= Private_Declarations
(S
);
1988 Decls
:= Visible_Declarations
(S
);
1991 Decls
:= Declarations
(S
);
1997 end May_Need_Implicit_Body
;
1999 ----------------------
2000 -- New_Private_Type --
2001 ----------------------
2003 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
2005 -- For other than Ada 2012, enter the name in the current scope
2007 if Ada_Version
< Ada_2012
then
2010 -- Ada 2012 (AI05-0162): Enter the name in the current scope handling
2011 -- private type that completes an incomplete type.
2017 Prev
:= Find_Type_Name
(N
);
2018 pragma Assert
(Prev
= Id
2019 or else (Ekind
(Prev
) = E_Incomplete_Type
2020 and then Present
(Full_View
(Prev
))
2021 and then Full_View
(Prev
) = Id
));
2025 if Limited_Present
(Def
) then
2026 Set_Ekind
(Id
, E_Limited_Private_Type
);
2028 Set_Ekind
(Id
, E_Private_Type
);
2032 Set_Has_Delayed_Freeze
(Id
);
2033 Set_Is_First_Subtype
(Id
);
2034 Init_Size_Align
(Id
);
2036 Set_Is_Constrained
(Id
,
2037 No
(Discriminant_Specifications
(N
))
2038 and then not Unknown_Discriminants_Present
(N
));
2040 -- Set tagged flag before processing discriminants, to catch illegal
2043 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
2045 Set_Discriminant_Constraint
(Id
, No_Elist
);
2046 Set_Stored_Constraint
(Id
, No_Elist
);
2048 if Present
(Discriminant_Specifications
(N
)) then
2050 Process_Discriminants
(N
);
2053 elsif Unknown_Discriminants_Present
(N
) then
2054 Set_Has_Unknown_Discriminants
(Id
);
2057 Set_Private_Dependents
(Id
, New_Elmt_List
);
2059 if Tagged_Present
(Def
) then
2060 Set_Ekind
(Id
, E_Record_Type_With_Private
);
2061 Set_Direct_Primitive_Operations
(Id
, New_Elmt_List
);
2062 Set_Is_Abstract_Type
(Id
, Abstract_Present
(Def
));
2063 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
2064 Set_Has_Delayed_Freeze
(Id
, True);
2066 -- Create a class-wide type with the same attributes
2068 Make_Class_Wide_Type
(Id
);
2070 elsif Abstract_Present
(Def
) then
2071 Error_Msg_N
("only a tagged type can be abstract", N
);
2073 end New_Private_Type
;
2075 ----------------------------
2076 -- Uninstall_Declarations --
2077 ----------------------------
2079 procedure Uninstall_Declarations
(P
: Entity_Id
) is
2080 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
2083 Priv_Elmt
: Elmt_Id
;
2084 Priv_Sub
: Entity_Id
;
2086 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
2087 -- Copy to the private declaration the attributes of the full view that
2088 -- need to be available for the partial view also.
2090 function Type_In_Use
(T
: Entity_Id
) return Boolean;
2091 -- Check whether type or base type appear in an active use_type clause
2093 ------------------------------
2094 -- Preserve_Full_Attributes --
2095 ------------------------------
2097 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
2098 Priv_Is_Base_Type
: constant Boolean := Is_Base_Type
(Priv
);
2101 Set_Size_Info
(Priv
, (Full
));
2102 Set_RM_Size
(Priv
, RM_Size
(Full
));
2103 Set_Size_Known_At_Compile_Time
2104 (Priv
, Size_Known_At_Compile_Time
(Full
));
2105 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
2106 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
2107 Set_Is_Ada_2005_Only
(Priv
, Is_Ada_2005_Only
(Full
));
2108 Set_Is_Ada_2012_Only
(Priv
, Is_Ada_2012_Only
(Full
));
2109 Set_Has_Pragma_Unmodified
(Priv
, Has_Pragma_Unmodified
(Full
));
2110 Set_Has_Pragma_Unreferenced
(Priv
, Has_Pragma_Unreferenced
(Full
));
2111 Set_Has_Pragma_Unreferenced_Objects
2112 (Priv
, Has_Pragma_Unreferenced_Objects
2114 if Is_Unchecked_Union
(Full
) then
2115 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
2117 -- Why is atomic not copied here ???
2119 if Referenced
(Full
) then
2120 Set_Referenced
(Priv
);
2123 if Priv_Is_Base_Type
then
2124 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
2125 Set_Finalize_Storage_Only
(Priv
, Finalize_Storage_Only
2126 (Base_Type
(Full
)));
2127 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
2128 Set_Has_Controlled_Component
(Priv
, Has_Controlled_Component
2129 (Base_Type
(Full
)));
2132 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
2134 if Is_Tagged_Type
(Priv
)
2135 and then Is_Tagged_Type
(Full
)
2136 and then not Error_Posted
(Full
)
2138 if Is_Tagged_Type
(Priv
) then
2140 -- If the type is tagged, the tag itself must be available on
2141 -- the partial view, for expansion purposes.
2143 Set_First_Entity
(Priv
, First_Entity
(Full
));
2145 -- If there are discriminants in the partial view, these remain
2146 -- visible. Otherwise only the tag itself is visible, and there
2147 -- are no nameable components in the partial view.
2149 if No
(Last_Entity
(Priv
)) then
2150 Set_Last_Entity
(Priv
, First_Entity
(Priv
));
2154 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
2156 if Has_Discriminants
(Full
) then
2157 Set_Discriminant_Constraint
(Priv
,
2158 Discriminant_Constraint
(Full
));
2161 end Preserve_Full_Attributes
;
2167 function Type_In_Use
(T
: Entity_Id
) return Boolean is
2169 return Scope
(Base_Type
(T
)) = P
2170 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
2173 -- Start of processing for Uninstall_Declarations
2176 Id
:= First_Entity
(P
);
2177 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2178 if Debug_Flag_E
then
2179 Write_Str
("unlinking visible entity ");
2180 Write_Int
(Int
(Id
));
2184 -- On exit from the package scope, we must preserve the visibility
2185 -- established by use clauses in the current scope. Two cases:
2187 -- a) If the entity is an operator, it may be a primitive operator of
2188 -- a type for which there is a visible use-type clause.
2190 -- b) for other entities, their use-visibility is determined by a
2191 -- visible use clause for the package itself. For a generic instance,
2192 -- the instantiation of the formals appears in the visible part,
2193 -- but the formals are private and remain so.
2195 if Ekind
(Id
) = E_Function
2196 and then Is_Operator_Symbol_Name
(Chars
(Id
))
2197 and then not Is_Hidden
(Id
)
2198 and then not Error_Posted
(Id
)
2200 Set_Is_Potentially_Use_Visible
(Id
,
2202 or else Type_In_Use
(Etype
(Id
))
2203 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
2204 or else (Present
(Next_Formal
(First_Formal
(Id
)))
2207 (Etype
(Next_Formal
(First_Formal
(Id
))))));
2209 if In_Use
(P
) and then not Is_Hidden
(Id
) then
2211 -- A child unit of a use-visible package remains use-visible
2212 -- only if it is itself a visible child unit. Otherwise it
2213 -- would remain visible in other contexts where P is use-
2214 -- visible, because once compiled it stays in the entity list
2215 -- of its parent unit.
2217 if Is_Child_Unit
(Id
) then
2218 Set_Is_Potentially_Use_Visible
(Id
,
2219 Is_Visible_Child_Unit
(Id
));
2221 Set_Is_Potentially_Use_Visible
(Id
);
2225 Set_Is_Potentially_Use_Visible
(Id
, False);
2229 -- Local entities are not immediately visible outside of the package
2231 Set_Is_Immediately_Visible
(Id
, False);
2233 -- If this is a private type with a full view (for example a local
2234 -- subtype of a private type declared elsewhere), ensure that the
2235 -- full view is also removed from visibility: it may be exposed when
2236 -- swapping views in an instantiation.
2239 and then Present
(Full_View
(Id
))
2241 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
2244 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2245 Check_Abstract_Overriding
(Id
);
2246 Check_Conventions
(Id
);
2249 if (Ekind
(Id
) = E_Private_Type
2250 or else Ekind
(Id
) = E_Limited_Private_Type
)
2251 and then No
(Full_View
(Id
))
2252 and then not Is_Generic_Type
(Id
)
2253 and then not Is_Derived_Type
(Id
)
2255 Error_Msg_N
("missing full declaration for private type&", Id
);
2257 elsif Ekind
(Id
) = E_Record_Type_With_Private
2258 and then not Is_Generic_Type
(Id
)
2259 and then No
(Full_View
(Id
))
2261 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
2262 Error_Msg_N
("missing full declaration for private type&", Id
);
2265 ("missing full declaration for private extension", Id
);
2268 -- Case of constant, check for deferred constant declaration with
2269 -- no full view. Likely just a matter of a missing expression, or
2270 -- accidental use of the keyword constant.
2272 elsif Ekind
(Id
) = E_Constant
2274 -- OK if constant value present
2276 and then No
(Constant_Value
(Id
))
2278 -- OK if full view present
2280 and then No
(Full_View
(Id
))
2282 -- OK if imported, since that provides the completion
2284 and then not Is_Imported
(Id
)
2286 -- OK if object declaration replaced by renaming declaration as
2287 -- a result of OK_To_Rename processing (e.g. for concatenation)
2289 and then Nkind
(Parent
(Id
)) /= N_Object_Renaming_Declaration
2291 -- OK if object declaration with the No_Initialization flag set
2293 and then not (Nkind
(Parent
(Id
)) = N_Object_Declaration
2294 and then No_Initialization
(Parent
(Id
)))
2296 -- If no private declaration is present, we assume the user did
2297 -- not intend a deferred constant declaration and the problem
2298 -- is simply that the initializing expression is missing.
2300 if not Has_Private_Declaration
(Etype
(Id
)) then
2302 -- We assume that the user did not intend a deferred constant
2303 -- declaration, and the expression is just missing.
2306 ("constant declaration requires initialization expression",
2309 if Is_Limited_Type
(Etype
(Id
)) then
2311 ("\if variable intended, remove CONSTANT from declaration",
2315 -- Otherwise if a private declaration is present, then we are
2316 -- missing the full declaration for the deferred constant.
2320 ("missing full declaration for deferred constant (RM 7.4)",
2323 if Is_Limited_Type
(Etype
(Id
)) then
2325 ("\if variable intended, remove CONSTANT from declaration",
2334 -- If the specification was installed as the parent of a public child
2335 -- unit, the private declarations were not installed, and there is
2338 if not In_Private_Part
(P
) then
2341 Set_In_Private_Part
(P
, False);
2344 -- Make private entities invisible and exchange full and private
2345 -- declarations for private types. Id is now the first private entity
2348 while Present
(Id
) loop
2349 if Debug_Flag_E
then
2350 Write_Str
("unlinking private entity ");
2351 Write_Int
(Int
(Id
));
2355 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2356 Check_Abstract_Overriding
(Id
);
2357 Check_Conventions
(Id
);
2360 Set_Is_Immediately_Visible
(Id
, False);
2362 if Is_Private_Base_Type
(Id
)
2363 and then Present
(Full_View
(Id
))
2365 Full
:= Full_View
(Id
);
2367 -- If the partial view is not declared in the visible part of the
2368 -- package (as is the case when it is a type derived from some
2369 -- other private type in the private part of the current package),
2370 -- no exchange takes place.
2373 or else List_Containing
(Parent
(Id
))
2374 /= Visible_Declarations
(Specification
(Decl
))
2379 -- The entry in the private part points to the full declaration,
2380 -- which is currently visible. Exchange them so only the private
2381 -- type declaration remains accessible, and link private and full
2382 -- declaration in the opposite direction. Before the actual
2383 -- exchange, we copy back attributes of the full view that must
2384 -- be available to the partial view too.
2386 Preserve_Full_Attributes
(Id
, Full
);
2388 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
2390 if Is_Indefinite_Subtype
(Full
)
2391 and then not Is_Indefinite_Subtype
(Id
)
2394 ("full view of type must be definite subtype", Full
);
2397 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2399 -- Swap out the subtypes and derived types of Id that were
2400 -- compiled in this scope, or installed previously by
2401 -- Install_Private_Declarations.
2403 -- Before we do the swap, we verify the presence of the Full_View
2404 -- field which may be empty due to a swap by a previous call to
2405 -- End_Package_Scope (e.g. from the freezing mechanism).
2407 while Present
(Priv_Elmt
) loop
2408 Priv_Sub
:= Node
(Priv_Elmt
);
2410 if Present
(Full_View
(Priv_Sub
)) then
2412 if Scope
(Priv_Sub
) = P
2413 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
2415 Set_Is_Immediately_Visible
(Priv_Sub
, False);
2418 if Is_Visible_Dependent
(Priv_Sub
) then
2419 Preserve_Full_Attributes
2420 (Priv_Sub
, Full_View
(Priv_Sub
));
2421 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
2422 Exchange_Declarations
(Priv_Sub
);
2426 Next_Elmt
(Priv_Elmt
);
2429 -- Now restore the type itself to its private view
2431 Exchange_Declarations
(Id
);
2433 -- If we have installed an underlying full view for a type derived
2434 -- from a private type in a child unit, restore the proper views
2435 -- of private and full view. See corresponding code in
2436 -- Install_Private_Declarations.
2438 -- After the exchange, Full denotes the private type in the
2439 -- visible part of the package.
2441 if Is_Private_Base_Type
(Full
)
2442 and then Present
(Full_View
(Full
))
2443 and then Present
(Underlying_Full_View
(Full
))
2444 and then In_Package_Body
(Current_Scope
)
2446 Set_Full_View
(Full
, Underlying_Full_View
(Full
));
2447 Set_Underlying_Full_View
(Full
, Empty
);
2450 elsif Ekind
(Id
) = E_Incomplete_Type
2451 and then Comes_From_Source
(Id
)
2452 and then No
(Full_View
(Id
))
2454 -- Mark Taft amendment types. Verify that there are no primitive
2455 -- operations declared for the type (3.10.1(9)).
2457 Set_Has_Completion_In_Body
(Id
);
2464 Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2465 while Present
(Elmt
) loop
2466 Subp
:= Node
(Elmt
);
2468 -- Is_Primitive is tested because there can be cases where
2469 -- nonprimitive subprograms (in nested packages) are added
2470 -- to the Private_Dependents list.
2472 if Is_Overloadable
(Subp
) and then Is_Primitive
(Subp
) then
2474 ("type& must be completed in the private part",
2477 -- The return type of an access_to_function cannot be a
2478 -- Taft-amendment type.
2480 elsif Ekind
(Subp
) = E_Subprogram_Type
then
2481 if Etype
(Subp
) = Id
2483 (Is_Class_Wide_Type
(Etype
(Subp
))
2484 and then Etype
(Etype
(Subp
)) = Id
)
2487 ("type& must be completed in the private part",
2488 Associated_Node_For_Itype
(Subp
), Id
);
2496 elsif not Is_Child_Unit
(Id
)
2497 and then (not Is_Private_Type
(Id
)
2498 or else No
(Full_View
(Id
)))
2501 Set_Is_Potentially_Use_Visible
(Id
, False);
2507 end Uninstall_Declarations
;
2509 ------------------------
2510 -- Unit_Requires_Body --
2511 ------------------------
2513 function Unit_Requires_Body
(P
: Entity_Id
) return Boolean is
2517 -- Imported entity never requires body. Right now, only subprograms can
2518 -- be imported, but perhaps in the future we will allow import of
2521 if Is_Imported
(P
) then
2524 -- Body required if library package with pragma Elaborate_Body
2526 elsif Has_Pragma_Elaborate_Body
(P
) then
2529 -- Body required if subprogram
2531 elsif Is_Subprogram
(P
) or else Is_Generic_Subprogram
(P
) then
2534 -- Treat a block as requiring a body
2536 elsif Ekind
(P
) = E_Block
then
2539 elsif Ekind
(P
) = E_Package
2540 and then Nkind
(Parent
(P
)) = N_Package_Specification
2541 and then Present
(Generic_Parent
(Parent
(P
)))
2544 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(P
));
2546 if Has_Pragma_Elaborate_Body
(G_P
) then
2552 -- Otherwise search entity chain for entity requiring completion
2554 E
:= First_Entity
(P
);
2555 while Present
(E
) loop
2557 -- Always ignore child units. Child units get added to the entity
2558 -- list of a parent unit, but are not original entities of the
2559 -- parent, and so do not affect whether the parent needs a body.
2561 if Is_Child_Unit
(E
) then
2564 -- Ignore formal packages and their renamings
2566 elsif Ekind
(E
) = E_Package
2567 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
2568 N_Formal_Package_Declaration
2572 -- Otherwise test to see if entity requires a completion.
2573 -- Note that subprogram entities whose declaration does not come
2574 -- from source are ignored here on the basis that we assume the
2575 -- expander will provide an implicit completion at some point.
2577 elsif (Is_Overloadable
(E
)
2578 and then Ekind
(E
) /= E_Enumeration_Literal
2579 and then Ekind
(E
) /= E_Operator
2580 and then not Is_Abstract_Subprogram
(E
)
2581 and then not Has_Completion
(E
)
2582 and then Comes_From_Source
(Parent
(E
)))
2585 (Ekind
(E
) = E_Package
2587 and then not Has_Completion
(E
)
2588 and then Unit_Requires_Body
(E
))
2591 (Ekind
(E
) = E_Incomplete_Type
2592 and then No
(Full_View
(E
))
2593 and then not Is_Generic_Type
(E
))
2596 ((Ekind
(E
) = E_Task_Type
or else
2597 Ekind
(E
) = E_Protected_Type
)
2598 and then not Has_Completion
(E
))
2601 (Ekind
(E
) = E_Generic_Package
and then E
/= P
2602 and then not Has_Completion
(E
)
2603 and then Unit_Requires_Body
(E
))
2606 (Is_Generic_Subprogram
(E
)
2607 and then not Has_Completion
(E
))
2612 -- Entity that does not require completion
2622 end Unit_Requires_Body
;