1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2013, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 -- This package contains the routines to process package specifications and
27 -- bodies. The most important semantic aspects of package processing are the
28 -- handling of private and full declarations, and the construction of dispatch
29 -- tables for tagged types.
31 with Aspects
; use Aspects
;
32 with Atree
; use Atree
;
33 with Debug
; use Debug
;
34 with Einfo
; use Einfo
;
35 with Elists
; use Elists
;
36 with Errout
; use Errout
;
37 with Exp_Disp
; use Exp_Disp
;
38 with Exp_Dist
; use Exp_Dist
;
39 with Exp_Dbug
; use Exp_Dbug
;
41 with Lib
.Xref
; use Lib
.Xref
;
42 with Namet
; use Namet
;
43 with Nmake
; use Nmake
;
44 with Nlists
; use Nlists
;
46 with Output
; use Output
;
47 with Restrict
; use Restrict
;
49 with Sem_Aux
; use Sem_Aux
;
50 with Sem_Cat
; use Sem_Cat
;
51 with Sem_Ch3
; use Sem_Ch3
;
52 with Sem_Ch6
; use Sem_Ch6
;
53 with Sem_Ch8
; use Sem_Ch8
;
54 with Sem_Ch10
; use Sem_Ch10
;
55 with Sem_Ch12
; use Sem_Ch12
;
56 with Sem_Ch13
; use Sem_Ch13
;
57 with Sem_Disp
; use Sem_Disp
;
58 with Sem_Eval
; use Sem_Eval
;
59 with Sem_Util
; use Sem_Util
;
60 with Sem_Warn
; use Sem_Warn
;
61 with Snames
; use Snames
;
62 with Stand
; use Stand
;
63 with Sinfo
; use Sinfo
;
64 with Sinput
; use Sinput
;
66 with Uintp
; use Uintp
;
68 package body Sem_Ch7
is
70 -----------------------------------
71 -- Handling private declarations --
72 -----------------------------------
74 -- The principle that each entity has a single defining occurrence clashes
75 -- with the presence of two separate definitions for private types: the
76 -- first is the private type declaration, and the second is the full type
77 -- declaration. It is important that all references to the type point to
78 -- the same defining occurrence, namely the first one. To enforce the two
79 -- separate views of the entity, the corresponding information is swapped
80 -- between the two declarations. Outside of the package, the defining
81 -- occurrence only contains the private declaration information, while in
82 -- the private part and the body of the package the defining occurrence
83 -- contains the full declaration. To simplify the swap, the defining
84 -- occurrence that currently holds the private declaration points to the
85 -- full declaration. During semantic processing the defining occurrence
86 -- also points to a list of private dependents, that is to say access types
87 -- or composite types whose designated types or component types are
88 -- subtypes or derived types of the private type in question. After the
89 -- full declaration has been seen, the private dependents are updated to
90 -- indicate that they have full definitions.
92 -----------------------
93 -- Local Subprograms --
94 -----------------------
96 procedure Analyze_Package_Body_Helper
(N
: Node_Id
);
97 -- Does all the real work of Analyze_Package_Body
99 procedure Check_Anonymous_Access_Types
100 (Spec_Id
: Entity_Id
;
102 -- If the spec of a package has a limited_with_clause, it may declare
103 -- anonymous access types whose designated type is a limited view, such an
104 -- anonymous access return type for a function. This access type cannot be
105 -- elaborated in the spec itself, but it may need an itype reference if it
106 -- is used within a nested scope. In that case the itype reference is
107 -- created at the beginning of the corresponding package body and inserted
108 -- before other body declarations.
110 procedure Install_Package_Entity
(Id
: Entity_Id
);
111 -- Supporting procedure for Install_{Visible,Private}_Declarations. Places
112 -- one entity on its visibility chain, and recurses on the visible part if
113 -- the entity is an inner package.
115 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
116 -- True for a private type that is not a subtype
118 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
119 -- If the private dependent is a private type whose full view is derived
120 -- from the parent type, its full properties are revealed only if we are in
121 -- the immediate scope of the private dependent. Should this predicate be
122 -- tightened further???
124 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
125 -- Called upon entering the private part of a public child package and the
126 -- body of a nested package, to potentially declare certain inherited
127 -- subprograms that were inherited by types in the visible part, but whose
128 -- declaration was deferred because the parent operation was private and
129 -- not visible at that point. These subprograms are located by traversing
130 -- the visible part declarations looking for non-private type extensions
131 -- and then examining each of the primitive operations of such types to
132 -- find those that were inherited but declared with a special internal
133 -- name. Each such operation is now declared as an operation with a normal
134 -- name (using the name of the parent operation) and replaces the previous
135 -- implicit operation in the primitive operations list of the type. If the
136 -- inherited private operation has been overridden, then it's replaced by
137 -- the overriding operation.
139 procedure Unit_Requires_Body_Info
(P
: Entity_Id
);
140 -- Outputs info messages showing why package specification P requires a
141 -- body. Caller has checked that the switch requesting this information
142 -- is set, and that the package does indeed require a body.
144 --------------------------
145 -- Analyze_Package_Body --
146 --------------------------
148 procedure Analyze_Package_Body
(N
: Node_Id
) is
149 Loc
: constant Source_Ptr
:= Sloc
(N
);
153 Write_Str
("==> package body ");
154 Write_Name
(Chars
(Defining_Entity
(N
)));
155 Write_Str
(" from ");
156 Write_Location
(Loc
);
161 -- The real work is split out into the helper, so it can do "return;"
162 -- without skipping the debug output.
164 Analyze_Package_Body_Helper
(N
);
168 Write_Str
("<== package body ");
169 Write_Name
(Chars
(Defining_Entity
(N
)));
170 Write_Str
(" from ");
171 Write_Location
(Loc
);
174 end Analyze_Package_Body
;
176 ---------------------------------
177 -- Analyze_Package_Body_Helper --
178 ---------------------------------
180 procedure Analyze_Package_Body_Helper
(N
: Node_Id
) is
184 Last_Spec_Entity
: Entity_Id
;
188 procedure Install_Composite_Operations
(P
: Entity_Id
);
189 -- Composite types declared in the current scope may depend on types
190 -- that were private at the point of declaration, and whose full view
191 -- is now in scope. Indicate that the corresponding operations on the
192 -- composite type are available.
194 ----------------------------------
195 -- Install_Composite_Operations --
196 ----------------------------------
198 procedure Install_Composite_Operations
(P
: Entity_Id
) is
202 Id
:= First_Entity
(P
);
203 while Present
(Id
) loop
205 and then (Is_Limited_Composite
(Id
)
206 or else Is_Private_Composite
(Id
))
207 and then No
(Private_Component
(Id
))
209 Set_Is_Limited_Composite
(Id
, False);
210 Set_Is_Private_Composite
(Id
, False);
215 end Install_Composite_Operations
;
217 -- Start of processing for Analyze_Package_Body_Helper
220 -- Find corresponding package specification, and establish the current
221 -- scope. The visible defining entity for the package is the defining
222 -- occurrence in the spec. On exit from the package body, all body
223 -- declarations are attached to the defining entity for the body, but
224 -- the later is never used for name resolution. In this fashion there
225 -- is only one visible entity that denotes the package.
227 -- Set Body_Id. Note that this will be reset to point to the generic
228 -- copy later on in the generic case.
230 Body_Id
:= Defining_Entity
(N
);
232 -- Body is body of package instantiation. Corresponding spec has already
235 if Present
(Corresponding_Spec
(N
)) then
236 Spec_Id
:= Corresponding_Spec
(N
);
237 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
240 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
243 and then Is_Package_Or_Generic_Package
(Spec_Id
)
245 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
247 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
248 Error_Msg_N
("cannot supply body for package renaming", N
);
251 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
252 Error_Msg_N
("redefinition of package body", N
);
257 Error_Msg_N
("missing specification for package body", N
);
261 if Is_Package_Or_Generic_Package
(Spec_Id
)
262 and then (Scope
(Spec_Id
) = Standard_Standard
263 or else Is_Child_Unit
(Spec_Id
))
264 and then not Unit_Requires_Body
(Spec_Id
)
266 if Ada_Version
= Ada_83
then
268 ("optional package body (not allowed in Ada 95)??", N
);
270 Error_Msg_N
("spec of this package does not allow a body", N
);
275 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
276 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
278 if Is_Child_Unit
(Spec_Id
) then
279 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
281 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
284 Set_Is_Child_Unit
(Body_Id
);
287 -- Generic package case
289 if Ekind
(Spec_Id
) = E_Generic_Package
then
291 -- Disable expansion and perform semantic analysis on copy. The
292 -- unannotated body will be used in all instantiations.
294 Body_Id
:= Defining_Entity
(N
);
295 Set_Ekind
(Body_Id
, E_Package_Body
);
296 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
297 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
298 Set_Body_Entity
(Spec_Id
, Body_Id
);
299 Set_Spec_Entity
(Body_Id
, Spec_Id
);
301 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
304 -- Update Body_Id to point to the copied node for the remainder of
307 Body_Id
:= Defining_Entity
(N
);
311 -- The Body_Id is that of the copied node in the generic case, the
312 -- current node otherwise. Note that N was rewritten above, so we must
313 -- be sure to get the latest Body_Id value.
315 Set_Ekind
(Body_Id
, E_Package_Body
);
316 Set_Body_Entity
(Spec_Id
, Body_Id
);
317 Set_Spec_Entity
(Body_Id
, Spec_Id
);
318 Set_Contract
(Body_Id
, Make_Contract
(Sloc
(Body_Id
)));
320 -- Defining name for the package body is not a visible entity: Only the
321 -- defining name for the declaration is visible.
323 Set_Etype
(Body_Id
, Standard_Void_Type
);
324 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
325 Set_Corresponding_Spec
(N
, Spec_Id
);
326 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
328 -- The body entity is not used for semantics or code generation, but
329 -- it is attached to the entity list of the enclosing scope to simplify
330 -- the listing of back-annotations for the types it main contain.
332 if Scope
(Spec_Id
) /= Standard_Standard
then
333 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
336 -- Indicate that we are currently compiling the body of the package
338 Set_In_Package_Body
(Spec_Id
);
339 Set_Has_Completion
(Spec_Id
);
340 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
342 if Has_Aspects
(N
) then
343 Analyze_Aspect_Specifications
(N
, Body_Id
);
346 Push_Scope
(Spec_Id
);
348 Set_Categorization_From_Pragmas
(N
);
350 Install_Visible_Declarations
(Spec_Id
);
351 Install_Private_Declarations
(Spec_Id
);
352 Install_Private_With_Clauses
(Spec_Id
);
353 Install_Composite_Operations
(Spec_Id
);
355 Check_Anonymous_Access_Types
(Spec_Id
, N
);
357 if Ekind
(Spec_Id
) = E_Generic_Package
then
358 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
361 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
362 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
364 -- This is a nested package, so it may be necessary to declare certain
365 -- inherited subprograms that are not yet visible because the parent
366 -- type's subprograms are now visible.
368 if Ekind
(Scope
(Spec_Id
)) = E_Package
369 and then Scope
(Spec_Id
) /= Standard_Standard
371 Declare_Inherited_Private_Subprograms
(Spec_Id
);
374 if Present
(Declarations
(N
)) then
375 Analyze_Declarations
(Declarations
(N
));
376 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
379 -- Analyze_Declarations has caused freezing of all types. Now generate
380 -- bodies for RACW primitives and stream attributes, if any.
382 if Ekind
(Spec_Id
) = E_Package
and then Has_RACW
(Spec_Id
) then
384 -- Attach subprogram bodies to support RACWs declared in spec
386 Append_RACW_Bodies
(Declarations
(N
), Spec_Id
);
387 Analyze_List
(Declarations
(N
));
390 HSS
:= Handled_Statement_Sequence
(N
);
392 if Present
(HSS
) then
393 Process_End_Label
(HSS
, 't', Spec_Id
);
396 -- Check that elaboration code in a preelaborable package body is
397 -- empty other than null statements and labels (RM 10.2.1(6)).
399 Validate_Null_Statement_Sequence
(N
);
402 Validate_Categorization_Dependency
(N
, Spec_Id
);
403 Check_Completion
(Body_Id
);
405 -- Generate start of body reference. Note that we do this fairly late,
406 -- because the call will use In_Extended_Main_Source_Unit as a check,
407 -- and we want to make sure that Corresponding_Stub links are set
409 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
411 -- For a generic package, collect global references and mark them on
412 -- the original body so that they are not resolved again at the point
415 if Ekind
(Spec_Id
) /= E_Package
then
416 Save_Global_References
(Original_Node
(N
));
420 -- The entities of the package body have so far been chained onto the
421 -- declaration chain for the spec. That's been fine while we were in the
422 -- body, since we wanted them to be visible, but now that we are leaving
423 -- the package body, they are no longer visible, so we remove them from
424 -- the entity chain of the package spec entity, and copy them to the
425 -- entity chain of the package body entity, where they will never again
428 if Present
(Last_Spec_Entity
) then
429 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
430 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
431 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
432 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
435 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
436 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
437 Set_First_Entity
(Spec_Id
, Empty
);
438 Set_Last_Entity
(Spec_Id
, Empty
);
441 End_Package_Scope
(Spec_Id
);
443 -- All entities declared in body are not visible
449 E
:= First_Entity
(Body_Id
);
450 while Present
(E
) loop
451 Set_Is_Immediately_Visible
(E
, False);
452 Set_Is_Potentially_Use_Visible
(E
, False);
455 -- Child units may appear on the entity list (e.g. if they appear
456 -- in the context of a subunit) but they are not body entities.
458 if not Is_Child_Unit
(E
) then
459 Set_Is_Package_Body_Entity
(E
);
466 Check_References
(Body_Id
);
468 -- For a generic unit, check that the formal parameters are referenced,
469 -- and that local variables are used, as for regular packages.
471 if Ekind
(Spec_Id
) = E_Generic_Package
then
472 Check_References
(Spec_Id
);
475 -- The processing so far has made all entities of the package body
476 -- public (i.e. externally visible to the linker). This is in general
477 -- necessary, since inlined or generic bodies, for which code is
478 -- generated in other units, may need to see these entities. The
479 -- following loop runs backwards from the end of the entities of the
480 -- package body making these entities invisible until we reach a
481 -- referencer, i.e. a declaration that could reference a previous
482 -- declaration, a generic body or an inlined body, or a stub (which may
483 -- contain either of these). This is of course an approximation, but it
484 -- is conservative and definitely correct.
486 -- We only do this at the outer (library) level non-generic packages.
487 -- The reason is simply to cut down on the number of global symbols
488 -- generated, which has a double effect: (1) to make the compilation
489 -- process more efficient and (2) to give the code generator more
490 -- freedom to optimize within each unit, especially subprograms.
492 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
493 and then not Is_Generic_Unit
(Spec_Id
)
494 and then Present
(Declarations
(N
))
496 Make_Non_Public_Where_Possible
: declare
498 function Has_Referencer
500 Outer
: Boolean) return Boolean;
501 -- Traverse the given list of declarations in reverse order.
502 -- Return True if a referencer is present. Return False if none is
503 -- found. The Outer parameter is True for the outer level call and
504 -- False for inner level calls for nested packages. If Outer is
505 -- True, then any entities up to the point of hitting a referencer
506 -- get their Is_Public flag cleared, so that the entities will be
507 -- treated as static entities in the C sense, and need not have
508 -- fully qualified names. Furthermore, if the referencer is an
509 -- inlined subprogram that doesn't reference other subprograms,
510 -- we keep clearing the Is_Public flag on subprograms. For inner
511 -- levels, we need all names to be fully qualified to deal with
512 -- the same name appearing in parallel packages (right now this
513 -- is tied to their being external).
519 function Has_Referencer
521 Outer
: Boolean) return Boolean
523 Has_Referencer_Except_For_Subprograms
: Boolean := False;
530 function Check_Subprogram_Ref
(N
: Node_Id
)
531 return Traverse_Result
;
532 -- Look for references to subprograms
534 --------------------------
535 -- Check_Subprogram_Ref --
536 --------------------------
538 function Check_Subprogram_Ref
(N
: Node_Id
)
539 return Traverse_Result
544 -- Check name of procedure or function calls
546 if Nkind
(N
) in N_Subprogram_Call
547 and then Is_Entity_Name
(Name
(N
))
552 -- Check prefix of attribute references
554 if Nkind
(N
) = N_Attribute_Reference
555 and then Is_Entity_Name
(Prefix
(N
))
556 and then Present
(Entity
(Prefix
(N
)))
557 and then Ekind
(Entity
(Prefix
(N
))) in Subprogram_Kind
562 -- Check value of constants
564 if Nkind
(N
) = N_Identifier
565 and then Present
(Entity
(N
))
566 and then Ekind
(Entity
(N
)) = E_Constant
568 V
:= Constant_Value
(Entity
(N
));
571 and then not Compile_Time_Known_Value_Or_Aggr
(V
)
578 end Check_Subprogram_Ref
;
580 function Check_Subprogram_Refs
is
581 new Traverse_Func
(Check_Subprogram_Ref
);
583 -- Start of processing for Has_Referencer
591 while Present
(D
) loop
594 if K
in N_Body_Stub
then
597 -- Processing for subprogram bodies
599 elsif K
= N_Subprogram_Body
then
600 if Acts_As_Spec
(D
) then
601 E
:= Defining_Entity
(D
);
603 -- An inlined body acts as a referencer. Note also
604 -- that we never reset Is_Public for an inlined
605 -- subprogram. Gigi requires Is_Public to be set.
607 -- Note that we test Has_Pragma_Inline here rather
608 -- than Is_Inlined. We are compiling this for a
609 -- client, and it is the client who will decide if
610 -- actual inlining should occur, so we need to assume
611 -- that the procedure could be inlined for the purpose
612 -- of accessing global entities.
614 if Has_Pragma_Inline
(E
) then
616 and then Check_Subprogram_Refs
(D
) = OK
618 Has_Referencer_Except_For_Subprograms
:= True;
623 Set_Is_Public
(E
, False);
627 E
:= Corresponding_Spec
(D
);
631 -- A generic subprogram body acts as a referencer
633 if Is_Generic_Unit
(E
) then
637 if Has_Pragma_Inline
(E
) or else Is_Inlined
(E
) then
639 and then Check_Subprogram_Refs
(D
) = OK
641 Has_Referencer_Except_For_Subprograms
:= True;
649 -- Processing for package bodies
651 elsif K
= N_Package_Body
652 and then Present
(Corresponding_Spec
(D
))
654 E
:= Corresponding_Spec
(D
);
656 -- Generic package body is a referencer. It would seem
657 -- that we only have to consider generics that can be
658 -- exported, i.e. where the corresponding spec is the
659 -- spec of the current package, but because of nested
660 -- instantiations, a fully private generic body may
661 -- export other private body entities. Furthermore,
662 -- regardless of whether there was a previous inlined
663 -- subprogram, (an instantiation of) the generic package
664 -- may reference any entity declared before it.
666 if Is_Generic_Unit
(E
) then
669 -- For non-generic package body, recurse into body unless
670 -- this is an instance, we ignore instances since they
671 -- cannot have references that affect outer entities.
673 elsif not Is_Generic_Instance
(E
)
674 and then not Has_Referencer_Except_For_Subprograms
677 (Declarations
(D
), Outer
=> False)
683 -- Processing for package specs, recurse into declarations.
684 -- Again we skip this for the case of generic instances.
686 elsif K
= N_Package_Declaration
687 and then not Has_Referencer_Except_For_Subprograms
689 S
:= Specification
(D
);
691 if not Is_Generic_Unit
(Defining_Entity
(S
)) then
693 (Private_Declarations
(S
), Outer
=> False)
697 (Visible_Declarations
(S
), Outer
=> False)
703 -- Objects and exceptions need not be public if we have not
704 -- encountered a referencer so far. We only reset the flag
705 -- for outer level entities that are not imported/exported,
706 -- and which have no interface name.
708 elsif Nkind_In
(K
, N_Object_Declaration
,
709 N_Exception_Declaration
,
710 N_Subprogram_Declaration
)
712 E
:= Defining_Entity
(D
);
715 and then (not Has_Referencer_Except_For_Subprograms
716 or else K
= N_Subprogram_Declaration
)
717 and then not Is_Imported
(E
)
718 and then not Is_Exported
(E
)
719 and then No
(Interface_Name
(E
))
721 Set_Is_Public
(E
, False);
728 return Has_Referencer_Except_For_Subprograms
;
731 -- Start of processing for Make_Non_Public_Where_Possible
736 pragma Warnings
(Off
, Discard
);
739 Discard
:= Has_Referencer
(Declarations
(N
), Outer
=> True);
741 end Make_Non_Public_Where_Possible
;
744 -- If expander is not active, then here is where we turn off the
745 -- In_Package_Body flag, otherwise it is turned off at the end of the
746 -- corresponding expansion routine. If this is an instance body, we need
747 -- to qualify names of local entities, because the body may have been
748 -- compiled as a preliminary to another instantiation.
750 if not Expander_Active
then
751 Set_In_Package_Body
(Spec_Id
, False);
753 if Is_Generic_Instance
(Spec_Id
)
754 and then Operating_Mode
= Generate_Code
756 Qualify_Entity_Names
(N
);
759 end Analyze_Package_Body_Helper
;
761 ---------------------------------
762 -- Analyze_Package_Declaration --
763 ---------------------------------
765 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
766 Id
: constant Node_Id
:= Defining_Entity
(N
);
769 -- True when in the context of a declared pure library unit
771 Body_Required
: Boolean;
772 -- True when this package declaration requires a corresponding body
775 -- True when this package declaration is not a nested declaration
779 Write_Str
("==> package spec ");
780 Write_Name
(Chars
(Id
));
781 Write_Str
(" from ");
782 Write_Location
(Sloc
(N
));
787 Generate_Definition
(Id
);
789 Set_Ekind
(Id
, E_Package
);
790 Set_Etype
(Id
, Standard_Void_Type
);
791 Set_Contract
(Id
, Make_Contract
(Sloc
(Id
)));
793 -- Analyze aspect specifications immediately, since we need to recognize
794 -- things like Pure early enough to diagnose violations during analysis.
796 if Has_Aspects
(N
) then
797 Analyze_Aspect_Specifications
(N
, Id
);
800 -- Ada 2005 (AI-217): Check if the package has been erroneously named
801 -- in a limited-with clause of its own context. In this case the error
802 -- has been previously notified by Analyze_Context.
804 -- limited with Pkg; -- ERROR
805 -- package Pkg is ...
807 if From_Limited_With
(Id
) then
813 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
814 Set_Is_Pure
(Id
, PF
);
816 Set_Categorization_From_Pragmas
(N
);
818 Analyze
(Specification
(N
));
819 Validate_Categorization_Dependency
(N
, Id
);
821 Body_Required
:= Unit_Requires_Body
(Id
);
823 -- When this spec does not require an explicit body, we know that there
824 -- are no entities requiring completion in the language sense; we call
825 -- Check_Completion here only to ensure that any nested package
826 -- declaration that requires an implicit body gets one. (In the case
827 -- where a body is required, Check_Completion is called at the end of
828 -- the body's declarative part.)
830 if not Body_Required
then
834 Comp_Unit
:= Nkind
(Parent
(N
)) = N_Compilation_Unit
;
837 -- Set Body_Required indication on the compilation unit node, and
838 -- determine whether elaboration warnings may be meaningful on it.
840 Set_Body_Required
(Parent
(N
), Body_Required
);
842 if not Body_Required
then
843 Set_Suppress_Elaboration_Warnings
(Id
);
848 End_Package_Scope
(Id
);
850 -- For the declaration of a library unit that is a remote types package,
851 -- check legality rules regarding availability of stream attributes for
852 -- types that contain non-remote access values. This subprogram performs
853 -- visibility tests that rely on the fact that we have exited the scope
857 Validate_RT_RAT_Component
(N
);
862 Write_Str
("<== package spec ");
863 Write_Name
(Chars
(Id
));
864 Write_Str
(" from ");
865 Write_Location
(Sloc
(N
));
868 end Analyze_Package_Declaration
;
870 -----------------------------------
871 -- Analyze_Package_Specification --
872 -----------------------------------
874 -- Note that this code is shared for the analysis of generic package specs
875 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
877 procedure Analyze_Package_Specification
(N
: Node_Id
) is
878 Id
: constant Entity_Id
:= Defining_Entity
(N
);
879 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
880 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
881 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
884 Public_Child
: Boolean;
886 Private_With_Clauses_Installed
: Boolean := False;
887 -- In Ada 2005, private with_clauses are visible in the private part
888 -- of a nested package, even if it appears in the public part of the
889 -- enclosing package. This requires a separate step to install these
890 -- private_with_clauses, and remove them at the end of the nested
893 procedure Check_One_Tagged_Type_Or_Extension_At_Most
;
894 -- Issue an error in SPARK mode if a package specification contains
895 -- more than one tagged type or type extension.
897 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
898 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
899 -- Is_True_Constant) on all variables that are entities of Id, and on
900 -- the chain whose first element is FE. A recursive call is made for all
901 -- packages and generic packages.
903 procedure Generate_Parent_References
;
904 -- For a child unit, generate references to parent units, for
905 -- GPS navigation purposes.
907 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
908 -- Child and Unit are entities of compilation units. True if Child
909 -- is a public child of Parent as defined in 10.1.1
911 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
912 -- Reject completion of an incomplete or private type declarations
913 -- having a known discriminant part by an unchecked union.
915 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
916 -- Given the package entity of a generic package instantiation or
917 -- formal package whose corresponding generic is a child unit, installs
918 -- the private declarations of each of the child unit's parents.
919 -- This has to be done at the point of entering the instance package's
920 -- private part rather than being done in Sem_Ch12.Install_Parent
921 -- (which is where the parents' visible declarations are installed).
923 ------------------------------------------------
924 -- Check_One_Tagged_Type_Or_Extension_At_Most --
925 ------------------------------------------------
927 procedure Check_One_Tagged_Type_Or_Extension_At_Most
is
930 procedure Check_Decls
(Decls
: List_Id
);
931 -- Check that either Previous is Empty and Decls does not contain
932 -- more than one tagged type or type extension, or Previous is
933 -- already set and Decls contains no tagged type or type extension.
939 procedure Check_Decls
(Decls
: List_Id
) is
943 Decl
:= First
(Decls
);
944 while Present
(Decl
) loop
945 if Nkind
(Decl
) = N_Full_Type_Declaration
946 and then Is_Tagged_Type
(Defining_Identifier
(Decl
))
948 if No
(Previous
) then
952 Error_Msg_Sloc
:= Sloc
(Previous
);
953 Check_SPARK_Restriction
954 ("at most one tagged type or type extension allowed",
955 "\\ previous declaration#",
964 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
968 Check_Decls
(Vis_Decls
);
970 if Present
(Priv_Decls
) then
971 Check_Decls
(Priv_Decls
);
973 end Check_One_Tagged_Type_Or_Extension_At_Most
;
975 ---------------------
976 -- Clear_Constants --
977 ---------------------
979 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
983 -- Ignore package renamings, not interesting and they can cause self
984 -- referential loops in the code below.
986 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
990 -- Note: in the loop below, the check for Next_Entity pointing back
991 -- to the package entity may seem odd, but it is needed, because a
992 -- package can contain a renaming declaration to itself, and such
993 -- renamings are generated automatically within package instances.
996 while Present
(E
) and then E
/= Id
loop
997 if Is_Assignable
(E
) then
998 Set_Never_Set_In_Source
(E
, False);
999 Set_Is_True_Constant
(E
, False);
1000 Set_Current_Value
(E
, Empty
);
1001 Set_Is_Known_Null
(E
, False);
1002 Set_Last_Assignment
(E
, Empty
);
1004 if not Can_Never_Be_Null
(E
) then
1005 Set_Is_Known_Non_Null
(E
, False);
1008 elsif Is_Package_Or_Generic_Package
(E
) then
1009 Clear_Constants
(E
, First_Entity
(E
));
1010 Clear_Constants
(E
, First_Private_Entity
(E
));
1015 end Clear_Constants
;
1017 --------------------------------
1018 -- Generate_Parent_References --
1019 --------------------------------
1021 procedure Generate_Parent_References
is
1022 Decl
: constant Node_Id
:= Parent
(N
);
1025 if Id
= Cunit_Entity
(Main_Unit
)
1026 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
1028 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1030 elsif not Nkind_In
(Unit
(Cunit
(Main_Unit
)), N_Subprogram_Body
,
1033 -- If current unit is an ancestor of main unit, generate a
1034 -- reference to its own parent.
1038 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
1041 if Nkind
(Main_Spec
) = N_Package_Body
then
1042 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
1045 U
:= Parent_Spec
(Main_Spec
);
1046 while Present
(U
) loop
1047 if U
= Parent
(Decl
) then
1048 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1051 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
1055 U
:= Parent_Spec
(Unit
(U
));
1060 end Generate_Parent_References
;
1062 ---------------------
1063 -- Is_Public_Child --
1064 ---------------------
1066 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
1068 if not Is_Private_Descendant
(Child
) then
1071 if Child
= Unit
then
1072 return not Private_Present
(
1073 Parent
(Unit_Declaration_Node
(Child
)));
1075 return Is_Public_Child
(Scope
(Child
), Unit
);
1078 end Is_Public_Child
;
1080 ----------------------------------------
1081 -- Inspect_Unchecked_Union_Completion --
1082 ----------------------------------------
1084 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
1088 Decl
:= First
(Decls
);
1089 while Present
(Decl
) loop
1091 -- We are looking at an incomplete or private type declaration
1092 -- with a known_discriminant_part whose full view is an
1095 if Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
1096 N_Private_Type_Declaration
)
1097 and then Has_Discriminants
(Defining_Identifier
(Decl
))
1098 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
1100 Is_Unchecked_Union
(Full_View
(Defining_Identifier
(Decl
)))
1103 ("completion of discriminated partial view "
1104 & "cannot be an unchecked union",
1105 Full_View
(Defining_Identifier
(Decl
)));
1110 end Inspect_Unchecked_Union_Completion
;
1112 -----------------------------------------
1113 -- Install_Parent_Private_Declarations --
1114 -----------------------------------------
1116 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
1117 Inst_Par
: Entity_Id
;
1118 Gen_Par
: Entity_Id
;
1119 Inst_Node
: Node_Id
;
1122 Inst_Par
:= Inst_Id
;
1125 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
1126 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
1127 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
1129 if Nkind_In
(Inst_Node
, N_Package_Instantiation
,
1130 N_Formal_Package_Declaration
)
1131 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
1133 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
1135 if Present
(Renamed_Entity
(Inst_Par
)) then
1136 Inst_Par
:= Renamed_Entity
(Inst_Par
);
1141 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
1143 -- Install the private declarations and private use clauses
1144 -- of a parent instance of the child instance, unless the
1145 -- parent instance private declarations have already been
1146 -- installed earlier in Analyze_Package_Specification, which
1147 -- happens when a generic child is instantiated, and the
1148 -- instance is a child of the parent instance.
1150 -- Installing the use clauses of the parent instance twice
1151 -- is both unnecessary and wrong, because it would cause the
1152 -- clauses to be chained to themselves in the use clauses
1153 -- list of the scope stack entry. That in turn would cause
1154 -- an endless loop from End_Use_Clauses upon scope exit.
1156 -- The parent is now fully visible. It may be a hidden open
1157 -- scope if we are currently compiling some child instance
1158 -- declared within it, but while the current instance is being
1159 -- compiled the parent is immediately visible. In particular
1160 -- its entities must remain visible if a stack save/restore
1161 -- takes place through a call to Rtsfind.
1163 if Present
(Gen_Par
) then
1164 if not In_Private_Part
(Inst_Par
) then
1165 Install_Private_Declarations
(Inst_Par
);
1166 Set_Use
(Private_Declarations
1168 (Unit_Declaration_Node
(Inst_Par
))));
1169 Set_Is_Hidden_Open_Scope
(Inst_Par
, False);
1172 -- If we've reached the end of the generic instance parents,
1173 -- then finish off by looping through the nongeneric parents
1174 -- and installing their private declarations.
1176 -- If one of the non-generic parents is itself on the scope
1177 -- stack, do not install its private declarations: they are
1178 -- installed in due time when the private part of that parent
1179 -- is analyzed. This is delicate ???
1182 while Present
(Inst_Par
)
1183 and then Inst_Par
/= Standard_Standard
1184 and then (not In_Open_Scopes
(Inst_Par
)
1185 or else not In_Private_Part
(Inst_Par
))
1187 Install_Private_Declarations
(Inst_Par
);
1188 Set_Use
(Private_Declarations
1190 (Unit_Declaration_Node
(Inst_Par
))));
1191 Inst_Par
:= Scope
(Inst_Par
);
1201 end Install_Parent_Private_Declarations
;
1203 -- Start of processing for Analyze_Package_Specification
1206 if Present
(Vis_Decls
) then
1207 Analyze_Declarations
(Vis_Decls
);
1210 -- Verify that incomplete types have received full declarations and
1211 -- also build invariant procedures for any types with invariants.
1213 E
:= First_Entity
(Id
);
1214 while Present
(E
) loop
1216 -- Check on incomplete types
1218 -- AI05-0213: A formal incomplete type has no completion
1220 if Ekind
(E
) = E_Incomplete_Type
1221 and then No
(Full_View
(E
))
1222 and then not Is_Generic_Type
(E
)
1224 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
1227 -- Build invariant procedures
1229 if Is_Type
(E
) and then Has_Invariants
(E
) then
1230 Build_Invariant_Procedure
(E
, N
);
1236 if Is_Remote_Call_Interface
(Id
)
1237 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
1239 Validate_RCI_Declarations
(Id
);
1242 -- Save global references in the visible declarations, before installing
1243 -- private declarations of parent unit if there is one, because the
1244 -- privacy status of types defined in the parent will change. This is
1245 -- only relevant for generic child units, but is done in all cases for
1248 if Ekind
(Id
) = E_Generic_Package
1249 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1252 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1253 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1255 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1256 Save_Global_References
(Orig_Decl
);
1257 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1261 -- If package is a public child unit, then make the private declarations
1262 -- of the parent visible.
1264 Public_Child
:= False;
1268 Pack_Decl
: Node_Id
;
1273 Par_Spec
:= Parent_Spec
(Parent
(N
));
1275 -- If the package is formal package of an enclosing generic, it is
1276 -- transformed into a local generic declaration, and compiled to make
1277 -- its spec available. We need to retrieve the original generic to
1278 -- determine whether it is a child unit, and install its parents.
1282 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1284 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1285 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1288 if Present
(Par_Spec
) then
1289 Generate_Parent_References
;
1291 while Scope
(Par
) /= Standard_Standard
1292 and then Is_Public_Child
(Id
, Par
)
1293 and then In_Open_Scopes
(Par
)
1295 Public_Child
:= True;
1297 Install_Private_Declarations
(Par
);
1298 Install_Private_With_Clauses
(Par
);
1299 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1300 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1305 if Is_Compilation_Unit
(Id
) then
1306 Install_Private_With_Clauses
(Id
);
1309 -- The current compilation unit may include private with_clauses,
1310 -- which are visible in the private part of the current nested
1311 -- package, and have to be installed now. This is not done for
1312 -- nested instantiations, where the private with_clauses of the
1313 -- enclosing unit have no effect once the instantiation info is
1314 -- established and we start analyzing the package declaration.
1317 Comp_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
1319 if Is_Package_Or_Generic_Package
(Comp_Unit
)
1320 and then not In_Private_Part
(Comp_Unit
)
1321 and then not In_Instance
1323 Install_Private_With_Clauses
(Comp_Unit
);
1324 Private_With_Clauses_Installed
:= True;
1329 -- If this is a package associated with a generic instance or formal
1330 -- package, then the private declarations of each of the generic's
1331 -- parents must be installed at this point.
1333 if Is_Generic_Instance
(Id
) then
1334 Install_Parent_Private_Declarations
(Id
);
1337 -- Analyze private part if present. The flag In_Private_Part is reset
1338 -- in End_Package_Scope.
1340 L
:= Last_Entity
(Id
);
1342 if Present
(Priv_Decls
) then
1343 Set_In_Private_Part
(Id
);
1345 -- Upon entering a public child's private part, it may be necessary
1346 -- to declare subprograms that were derived in the package's visible
1347 -- part but not yet made visible.
1349 if Public_Child
then
1350 Declare_Inherited_Private_Subprograms
(Id
);
1353 Analyze_Declarations
(Priv_Decls
);
1355 -- Check the private declarations for incomplete deferred constants
1357 Inspect_Deferred_Constant_Completion
(Priv_Decls
);
1359 -- The first private entity is the immediate follower of the last
1360 -- visible entity, if there was one.
1363 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1365 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
1368 -- There may be inherited private subprograms that need to be declared,
1369 -- even in the absence of an explicit private part. If there are any
1370 -- public declarations in the package and the package is a public child
1371 -- unit, then an implicit private part is assumed.
1373 elsif Present
(L
) and then Public_Child
then
1374 Set_In_Private_Part
(Id
);
1375 Declare_Inherited_Private_Subprograms
(Id
);
1376 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1379 E
:= First_Entity
(Id
);
1380 while Present
(E
) loop
1382 -- Check rule of 3.6(11), which in general requires waiting till all
1383 -- full types have been seen.
1385 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1386 Check_Aliased_Component_Types
(E
);
1389 -- Check preelaborable initialization for full type completing a
1390 -- private type for which pragma Preelaborable_Initialization given.
1393 and then Must_Have_Preelab_Init
(E
)
1394 and then not Has_Preelaborable_Initialization
(E
)
1397 ("full view of & does not have preelaborable initialization", E
);
1400 -- An invariant may appear on a full view of a type
1403 and then Has_Private_Declaration
(E
)
1404 and then Nkind
(Parent
(E
)) = N_Full_Type_Declaration
1405 and then Has_Aspects
(Parent
(E
))
1411 ASN
:= First
(Aspect_Specifications
(Parent
(E
)));
1412 while Present
(ASN
) loop
1413 if Nam_In
(Chars
(Identifier
(ASN
)), Name_Invariant
,
1414 Name_Type_Invariant
)
1416 Build_Invariant_Procedure
(E
, N
);
1428 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1429 -- declaration having a known_discriminant_part shall not be an
1430 -- unchecked union type.
1432 if Present
(Vis_Decls
) then
1433 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1436 if Present
(Priv_Decls
) then
1437 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1440 if Ekind
(Id
) = E_Generic_Package
1441 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1442 and then Present
(Priv_Decls
)
1444 -- Save global references in private declarations, ignoring the
1445 -- visible declarations that were processed earlier.
1448 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1449 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1450 Save_Form
: constant List_Id
:=
1451 Generic_Formal_Declarations
(Orig_Decl
);
1454 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1455 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1456 Save_Global_References
(Orig_Decl
);
1457 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1458 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1462 Process_End_Label
(N
, 'e', Id
);
1464 -- Remove private_with_clauses of enclosing compilation unit, if they
1467 if Private_With_Clauses_Installed
then
1468 Remove_Private_With_Clauses
(Cunit
(Current_Sem_Unit
));
1471 -- For the case of a library level package, we must go through all the
1472 -- entities clearing the indications that the value may be constant and
1473 -- not modified. Why? Because any client of this package may modify
1474 -- these values freely from anywhere. This also applies to any nested
1475 -- packages or generic packages.
1477 -- For now we unconditionally clear constants for packages that are
1478 -- instances of generic packages. The reason is that we do not have the
1479 -- body yet, and we otherwise think things are unreferenced when they
1480 -- are not. This should be fixed sometime (the effect is not terrible,
1481 -- we just lose some warnings, and also some cases of value propagation)
1484 if Is_Library_Level_Entity
(Id
)
1485 or else Is_Generic_Instance
(Id
)
1487 Clear_Constants
(Id
, First_Entity
(Id
));
1488 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1491 -- Issue an error in SPARK mode if a package specification contains
1492 -- more than one tagged type or type extension.
1494 Check_One_Tagged_Type_Or_Extension_At_Most
;
1496 -- If switch set, output information on why body required
1498 if List_Body_Required_Info
1499 and then In_Extended_Main_Source_Unit
(Id
)
1500 and then Unit_Requires_Body
(Id
)
1502 Unit_Requires_Body_Info
(Id
);
1504 end Analyze_Package_Specification
;
1506 --------------------------------------
1507 -- Analyze_Private_Type_Declaration --
1508 --------------------------------------
1510 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1511 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1512 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1515 Generate_Definition
(Id
);
1516 Set_Is_Pure
(Id
, PF
);
1517 Init_Size_Align
(Id
);
1519 if not Is_Package_Or_Generic_Package
(Current_Scope
)
1520 or else In_Private_Part
(Current_Scope
)
1522 Error_Msg_N
("invalid context for private declaration", N
);
1525 New_Private_Type
(N
, Id
, N
);
1526 Set_Depends_On_Private
(Id
);
1528 if Has_Aspects
(N
) then
1529 Analyze_Aspect_Specifications
(N
, Id
);
1531 end Analyze_Private_Type_Declaration
;
1533 ----------------------------------
1534 -- Check_Anonymous_Access_Types --
1535 ----------------------------------
1537 procedure Check_Anonymous_Access_Types
1538 (Spec_Id
: Entity_Id
;
1545 -- Itype references are only needed by gigi, to force elaboration of
1546 -- itypes. In the absence of code generation, they are not needed.
1548 if not Expander_Active
then
1552 E
:= First_Entity
(Spec_Id
);
1553 while Present
(E
) loop
1554 if Ekind
(E
) = E_Anonymous_Access_Type
1555 and then From_Limited_With
(E
)
1557 IR
:= Make_Itype_Reference
(Sloc
(P_Body
));
1560 if No
(Declarations
(P_Body
)) then
1561 Set_Declarations
(P_Body
, New_List
(IR
));
1563 Prepend
(IR
, Declarations
(P_Body
));
1569 end Check_Anonymous_Access_Types
;
1571 -------------------------------------------
1572 -- Declare_Inherited_Private_Subprograms --
1573 -------------------------------------------
1575 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1577 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1578 -- Check whether an inherited subprogram S is an operation of an
1579 -- untagged derived type T.
1581 ---------------------
1582 -- Is_Primitive_Of --
1583 ---------------------
1585 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1589 -- If the full view is a scalar type, the type is the anonymous base
1590 -- type, but the operation mentions the first subtype, so check the
1591 -- signature against the base type.
1593 if Base_Type
(Etype
(S
)) = Base_Type
(T
) then
1597 Formal
:= First_Formal
(S
);
1598 while Present
(Formal
) loop
1599 if Base_Type
(Etype
(Formal
)) = Base_Type
(T
) then
1603 Next_Formal
(Formal
);
1608 end Is_Primitive_Of
;
1615 Op_Elmt_2
: Elmt_Id
;
1616 Prim_Op
: Entity_Id
;
1617 New_Op
: Entity_Id
:= Empty
;
1618 Parent_Subp
: Entity_Id
;
1621 -- Start of processing for Declare_Inherited_Private_Subprograms
1624 E
:= First_Entity
(Id
);
1625 while Present
(E
) loop
1627 -- If the entity is a nonprivate type extension whose parent type
1628 -- is declared in an open scope, then the type may have inherited
1629 -- operations that now need to be made visible. Ditto if the entity
1630 -- is a formal derived type in a child unit.
1632 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1634 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1635 and then Is_Generic_Type
(E
)))
1636 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1637 and then Is_Base_Type
(E
)
1639 if Is_Tagged_Type
(E
) then
1640 Op_List
:= Primitive_Operations
(E
);
1642 Tag
:= First_Tag_Component
(E
);
1644 Op_Elmt
:= First_Elmt
(Op_List
);
1645 while Present
(Op_Elmt
) loop
1646 Prim_Op
:= Node
(Op_Elmt
);
1648 -- Search primitives that are implicit operations with an
1649 -- internal name whose parent operation has a normal name.
1651 if Present
(Alias
(Prim_Op
))
1652 and then Find_Dispatching_Type
(Alias
(Prim_Op
)) /= E
1653 and then not Comes_From_Source
(Prim_Op
)
1654 and then Is_Internal_Name
(Chars
(Prim_Op
))
1655 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1657 Parent_Subp
:= Alias
(Prim_Op
);
1659 -- Case 1: Check if the type has also an explicit
1660 -- overriding for this primitive.
1662 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1663 while Present
(Op_Elmt_2
) loop
1665 -- Skip entities with attribute Interface_Alias since
1666 -- they are not overriding primitives (these entities
1667 -- link an interface primitive with their covering
1670 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
1671 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
1672 and then No
(Interface_Alias
(Node
(Op_Elmt_2
)))
1674 -- The private inherited operation has been
1675 -- overridden by an explicit subprogram:
1676 -- replace the former by the latter.
1678 New_Op
:= Node
(Op_Elmt_2
);
1679 Replace_Elmt
(Op_Elmt
, New_Op
);
1680 Remove_Elmt
(Op_List
, Op_Elmt_2
);
1681 Set_Overridden_Operation
(New_Op
, Parent_Subp
);
1683 -- We don't need to inherit its dispatching slot.
1684 -- Set_All_DT_Position has previously ensured that
1685 -- the same slot was assigned to the two primitives
1688 and then Present
(DTC_Entity
(New_Op
))
1689 and then Present
(DTC_Entity
(Prim_Op
))
1692 (DT_Position
(New_Op
) = DT_Position
(Prim_Op
));
1696 goto Next_Primitive
;
1699 Next_Elmt
(Op_Elmt_2
);
1702 -- Case 2: We have not found any explicit overriding and
1703 -- hence we need to declare the operation (i.e., make it
1706 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1708 -- Inherit the dispatching slot if E is already frozen
1711 and then Present
(DTC_Entity
(Alias
(Prim_Op
)))
1713 Set_DTC_Entity_Value
(E
, New_Op
);
1714 Set_DT_Position
(New_Op
,
1715 DT_Position
(Alias
(Prim_Op
)));
1719 (Is_Dispatching_Operation
(New_Op
)
1720 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
1722 -- Substitute the new operation for the old one in the
1723 -- type's primitive operations list. Since the new
1724 -- operation was also just added to the end of list,
1725 -- the last element must be removed.
1727 -- (Question: is there a simpler way of declaring the
1728 -- operation, say by just replacing the name of the
1729 -- earlier operation, reentering it in the in the symbol
1730 -- table (how?), and marking it as private???)
1732 Replace_Elmt
(Op_Elmt
, New_Op
);
1733 Remove_Last_Elmt
(Op_List
);
1737 Next_Elmt
(Op_Elmt
);
1740 -- Generate listing showing the contents of the dispatch table
1742 if Debug_Flag_ZZ
then
1747 -- Non-tagged type, scan forward to locate inherited hidden
1750 Prim_Op
:= Next_Entity
(E
);
1751 while Present
(Prim_Op
) loop
1752 if Is_Subprogram
(Prim_Op
)
1753 and then Present
(Alias
(Prim_Op
))
1754 and then not Comes_From_Source
(Prim_Op
)
1755 and then Is_Internal_Name
(Chars
(Prim_Op
))
1756 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1757 and then Is_Primitive_Of
(E
, Prim_Op
)
1759 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1762 Next_Entity
(Prim_Op
);
1769 end Declare_Inherited_Private_Subprograms
;
1771 -----------------------
1772 -- End_Package_Scope --
1773 -----------------------
1775 procedure End_Package_Scope
(P
: Entity_Id
) is
1777 Uninstall_Declarations
(P
);
1779 end End_Package_Scope
;
1781 ---------------------------
1782 -- Exchange_Declarations --
1783 ---------------------------
1785 procedure Exchange_Declarations
(Id
: Entity_Id
) is
1786 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
1787 H1
: constant Entity_Id
:= Homonym
(Id
);
1788 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
1793 -- If missing full declaration for type, nothing to exchange
1795 if No
(Full_Id
) then
1799 -- Otherwise complete the exchange, and preserve semantic links
1801 Next2
:= Next_Entity
(Full_Id
);
1802 H2
:= Homonym
(Full_Id
);
1804 -- Reset full declaration pointer to reflect the switched entities and
1805 -- readjust the next entity chains.
1807 Exchange_Entities
(Id
, Full_Id
);
1809 Set_Next_Entity
(Id
, Next1
);
1810 Set_Homonym
(Id
, H1
);
1812 Set_Full_View
(Full_Id
, Id
);
1813 Set_Next_Entity
(Full_Id
, Next2
);
1814 Set_Homonym
(Full_Id
, H2
);
1815 end Exchange_Declarations
;
1817 ----------------------------
1818 -- Install_Package_Entity --
1819 ----------------------------
1821 procedure Install_Package_Entity
(Id
: Entity_Id
) is
1823 if not Is_Internal
(Id
) then
1824 if Debug_Flag_E
then
1825 Write_Str
("Install: ");
1826 Write_Name
(Chars
(Id
));
1830 if not Is_Child_Unit
(Id
) then
1831 Set_Is_Immediately_Visible
(Id
);
1835 end Install_Package_Entity
;
1837 ----------------------------------
1838 -- Install_Private_Declarations --
1839 ----------------------------------
1841 procedure Install_Private_Declarations
(P
: Entity_Id
) is
1844 Priv_Deps
: Elist_Id
;
1846 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
);
1847 -- When the full view of a private type is made available, we do the
1848 -- same for its private dependents under proper visibility conditions.
1849 -- When compiling a grand-chid unit this needs to be done recursively.
1851 -----------------------------
1852 -- Swap_Private_Dependents --
1853 -----------------------------
1855 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
) is
1858 Priv_Elmt
: Elmt_Id
;
1862 Priv_Elmt
:= First_Elmt
(Priv_Deps
);
1863 while Present
(Priv_Elmt
) loop
1864 Priv
:= Node
(Priv_Elmt
);
1866 -- Before the exchange, verify that the presence of the Full_View
1867 -- field. This field will be empty if the entity has already been
1868 -- installed due to a previous call.
1870 if Present
(Full_View
(Priv
))
1871 and then Is_Visible_Dependent
(Priv
)
1873 if Is_Private_Type
(Priv
) then
1874 Deps
:= Private_Dependents
(Priv
);
1880 -- For each subtype that is swapped, we also swap the reference
1881 -- to it in Private_Dependents, to allow access to it when we
1882 -- swap them out in End_Package_Scope.
1884 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
1885 Exchange_Declarations
(Priv
);
1886 Set_Is_Immediately_Visible
1887 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
1888 Set_Is_Potentially_Use_Visible
1889 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
1891 -- Within a child unit, recurse, except in generic child unit,
1892 -- which (unfortunately) handle private_dependents separately.
1895 and then Is_Child_Unit
(Cunit_Entity
(Current_Sem_Unit
))
1896 and then not Is_Empty_Elmt_List
(Deps
)
1897 and then not Inside_A_Generic
1899 Swap_Private_Dependents
(Deps
);
1903 Next_Elmt
(Priv_Elmt
);
1905 end Swap_Private_Dependents
;
1907 -- Start of processing for Install_Private_Declarations
1910 -- First exchange declarations for private types, so that the full
1911 -- declaration is visible. For each private type, we check its
1912 -- Private_Dependents list and also exchange any subtypes of or derived
1913 -- types from it. Finally, if this is a Taft amendment type, the
1914 -- incomplete declaration is irrelevant, and we want to link the
1915 -- eventual full declaration with the original private one so we
1916 -- also skip the exchange.
1918 Id
:= First_Entity
(P
);
1919 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1920 if Is_Private_Base_Type
(Id
)
1921 and then Comes_From_Source
(Full_View
(Id
))
1922 and then Present
(Full_View
(Id
))
1923 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
1924 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
1926 -- If there is a use-type clause on the private type, set the full
1927 -- view accordingly.
1929 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
1930 Full
:= Full_View
(Id
);
1932 if Is_Private_Base_Type
(Full
)
1933 and then Has_Private_Declaration
(Full
)
1934 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
1935 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
1936 and then In_Package_Body
(Current_Scope
)
1937 and then not Is_Private_Type
(Etype
(Full
))
1939 -- This is the completion of a private type by a derivation
1940 -- from another private type which is not private anymore. This
1941 -- can only happen in a package nested within a child package,
1942 -- when the parent type is defined in the parent unit. At this
1943 -- point the current type is not private either, and we have
1944 -- to install the underlying full view, which is now visible.
1945 -- Save the current full view as well, so that all views can be
1946 -- restored on exit. It may seem that after compiling the child
1947 -- body there are not environments to restore, but the back-end
1948 -- expects those links to be valid, and freeze nodes depend on
1951 if No
(Full_View
(Full
))
1952 and then Present
(Underlying_Full_View
(Full
))
1954 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
1955 Set_Underlying_Full_View
(Id
, Full
);
1957 Set_Underlying_Full_View
(Full
, Empty
);
1958 Set_Is_Frozen
(Full_View
(Id
));
1962 Priv_Deps
:= Private_Dependents
(Id
);
1963 Exchange_Declarations
(Id
);
1964 Set_Is_Immediately_Visible
(Id
);
1965 Swap_Private_Dependents
(Priv_Deps
);
1971 -- Next make other declarations in the private part visible as well
1973 Id
:= First_Private_Entity
(P
);
1974 while Present
(Id
) loop
1975 Install_Package_Entity
(Id
);
1976 Set_Is_Hidden
(Id
, False);
1980 -- Indicate that the private part is currently visible, so it can be
1981 -- properly reset on exit.
1983 Set_In_Private_Part
(P
);
1984 end Install_Private_Declarations
;
1986 ----------------------------------
1987 -- Install_Visible_Declarations --
1988 ----------------------------------
1990 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
1992 Last_Entity
: Entity_Id
;
1996 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
1998 if Is_Package_Or_Generic_Package
(P
) then
1999 Last_Entity
:= First_Private_Entity
(P
);
2001 Last_Entity
:= Empty
;
2004 Id
:= First_Entity
(P
);
2005 while Present
(Id
) and then Id
/= Last_Entity
loop
2006 Install_Package_Entity
(Id
);
2009 end Install_Visible_Declarations
;
2011 --------------------------
2012 -- Is_Private_Base_Type --
2013 --------------------------
2015 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
2017 return Ekind
(E
) = E_Private_Type
2018 or else Ekind
(E
) = E_Limited_Private_Type
2019 or else Ekind
(E
) = E_Record_Type_With_Private
;
2020 end Is_Private_Base_Type
;
2022 --------------------------
2023 -- Is_Visible_Dependent --
2024 --------------------------
2026 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
2028 S
: constant Entity_Id
:= Scope
(Dep
);
2031 -- Renamings created for actual types have the visibility of the actual
2033 if Ekind
(S
) = E_Package
2034 and then Is_Generic_Instance
(S
)
2035 and then (Is_Generic_Actual_Type
(Dep
)
2036 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
2040 elsif not (Is_Derived_Type
(Dep
))
2041 and then Is_Derived_Type
(Full_View
(Dep
))
2043 -- When instantiating a package body, the scope stack is empty, so
2044 -- check instead whether the dependent type is defined in the same
2045 -- scope as the instance itself.
2047 return In_Open_Scopes
(S
)
2048 or else (Is_Generic_Instance
(Current_Scope
)
2049 and then Scope
(Dep
) = Scope
(Current_Scope
));
2053 end Is_Visible_Dependent
;
2055 ----------------------------
2056 -- May_Need_Implicit_Body --
2057 ----------------------------
2059 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
2060 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
2061 S
: constant Node_Id
:= Parent
(P
);
2066 if not Has_Completion
(E
)
2067 and then Nkind
(P
) = N_Package_Declaration
2068 and then (Present
(Activation_Chain_Entity
(P
)) or else Has_RACW
(E
))
2071 Make_Package_Body
(Sloc
(E
),
2072 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
2073 Chars
=> Chars
(E
)),
2074 Declarations
=> New_List
);
2076 if Nkind
(S
) = N_Package_Specification
then
2077 if Present
(Private_Declarations
(S
)) then
2078 Decls
:= Private_Declarations
(S
);
2080 Decls
:= Visible_Declarations
(S
);
2083 Decls
:= Declarations
(S
);
2089 end May_Need_Implicit_Body
;
2091 ----------------------
2092 -- New_Private_Type --
2093 ----------------------
2095 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
2097 -- For other than Ada 2012, enter the name in the current scope
2099 if Ada_Version
< Ada_2012
then
2102 -- Ada 2012 (AI05-0162): Enter the name in the current scope. Note that
2103 -- there may be an incomplete previous view.
2109 Prev
:= Find_Type_Name
(N
);
2110 pragma Assert
(Prev
= Id
2111 or else (Ekind
(Prev
) = E_Incomplete_Type
2112 and then Present
(Full_View
(Prev
))
2113 and then Full_View
(Prev
) = Id
));
2117 if Limited_Present
(Def
) then
2118 Set_Ekind
(Id
, E_Limited_Private_Type
);
2120 Set_Ekind
(Id
, E_Private_Type
);
2124 Set_Has_Delayed_Freeze
(Id
);
2125 Set_Is_First_Subtype
(Id
);
2126 Init_Size_Align
(Id
);
2128 Set_Is_Constrained
(Id
,
2129 No
(Discriminant_Specifications
(N
))
2130 and then not Unknown_Discriminants_Present
(N
));
2132 -- Set tagged flag before processing discriminants, to catch illegal
2135 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
2137 Set_Discriminant_Constraint
(Id
, No_Elist
);
2138 Set_Stored_Constraint
(Id
, No_Elist
);
2140 if Present
(Discriminant_Specifications
(N
)) then
2142 Process_Discriminants
(N
);
2145 elsif Unknown_Discriminants_Present
(N
) then
2146 Set_Has_Unknown_Discriminants
(Id
);
2149 Set_Private_Dependents
(Id
, New_Elmt_List
);
2151 if Tagged_Present
(Def
) then
2152 Set_Ekind
(Id
, E_Record_Type_With_Private
);
2153 Set_Direct_Primitive_Operations
(Id
, New_Elmt_List
);
2154 Set_Is_Abstract_Type
(Id
, Abstract_Present
(Def
));
2155 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
2156 Set_Has_Delayed_Freeze
(Id
, True);
2158 -- Create a class-wide type with the same attributes
2160 Make_Class_Wide_Type
(Id
);
2162 elsif Abstract_Present
(Def
) then
2163 Error_Msg_N
("only a tagged type can be abstract", N
);
2165 end New_Private_Type
;
2167 ----------------------------
2168 -- Uninstall_Declarations --
2169 ----------------------------
2171 procedure Uninstall_Declarations
(P
: Entity_Id
) is
2172 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
2175 Priv_Elmt
: Elmt_Id
;
2176 Priv_Sub
: Entity_Id
;
2178 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
2179 -- Copy to the private declaration the attributes of the full view that
2180 -- need to be available for the partial view also.
2182 function Type_In_Use
(T
: Entity_Id
) return Boolean;
2183 -- Check whether type or base type appear in an active use_type clause
2185 ------------------------------
2186 -- Preserve_Full_Attributes --
2187 ------------------------------
2189 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
2190 Priv_Is_Base_Type
: constant Boolean := Is_Base_Type
(Priv
);
2193 Set_Size_Info
(Priv
, (Full
));
2194 Set_RM_Size
(Priv
, RM_Size
(Full
));
2195 Set_Size_Known_At_Compile_Time
2196 (Priv
, Size_Known_At_Compile_Time
(Full
));
2197 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
2198 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
2199 Set_Is_Ada_2005_Only
(Priv
, Is_Ada_2005_Only
(Full
));
2200 Set_Is_Ada_2012_Only
(Priv
, Is_Ada_2012_Only
(Full
));
2201 Set_Has_Pragma_Unmodified
(Priv
, Has_Pragma_Unmodified
(Full
));
2202 Set_Has_Pragma_Unreferenced
(Priv
, Has_Pragma_Unreferenced
(Full
));
2203 Set_Has_Pragma_Unreferenced_Objects
2204 (Priv
, Has_Pragma_Unreferenced_Objects
2206 if Is_Unchecked_Union
(Full
) then
2207 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
2209 -- Why is atomic not copied here ???
2211 if Referenced
(Full
) then
2212 Set_Referenced
(Priv
);
2215 if Priv_Is_Base_Type
then
2216 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
2217 Set_Finalize_Storage_Only
(Priv
, Finalize_Storage_Only
2218 (Base_Type
(Full
)));
2219 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
2220 Set_Has_Controlled_Component
(Priv
, Has_Controlled_Component
2221 (Base_Type
(Full
)));
2224 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
2226 -- Propagate information of type invariants, which may be specified
2227 -- for the full view.
2229 if Has_Invariants
(Full
) and not Has_Invariants
(Priv
) then
2230 Set_Has_Invariants
(Priv
);
2231 Set_Subprograms_For_Type
(Priv
, Subprograms_For_Type
(Full
));
2234 if Is_Tagged_Type
(Priv
)
2235 and then Is_Tagged_Type
(Full
)
2236 and then not Error_Posted
(Full
)
2238 if Is_Tagged_Type
(Priv
) then
2240 -- If the type is tagged, the tag itself must be available on
2241 -- the partial view, for expansion purposes.
2243 Set_First_Entity
(Priv
, First_Entity
(Full
));
2245 -- If there are discriminants in the partial view, these remain
2246 -- visible. Otherwise only the tag itself is visible, and there
2247 -- are no nameable components in the partial view.
2249 if No
(Last_Entity
(Priv
)) then
2250 Set_Last_Entity
(Priv
, First_Entity
(Priv
));
2254 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
2256 if Has_Discriminants
(Full
) then
2257 Set_Discriminant_Constraint
(Priv
,
2258 Discriminant_Constraint
(Full
));
2261 end Preserve_Full_Attributes
;
2267 function Type_In_Use
(T
: Entity_Id
) return Boolean is
2269 return Scope
(Base_Type
(T
)) = P
2270 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
2273 -- Start of processing for Uninstall_Declarations
2276 Id
:= First_Entity
(P
);
2277 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2278 if Debug_Flag_E
then
2279 Write_Str
("unlinking visible entity ");
2280 Write_Int
(Int
(Id
));
2284 -- On exit from the package scope, we must preserve the visibility
2285 -- established by use clauses in the current scope. Two cases:
2287 -- a) If the entity is an operator, it may be a primitive operator of
2288 -- a type for which there is a visible use-type clause.
2290 -- b) for other entities, their use-visibility is determined by a
2291 -- visible use clause for the package itself. For a generic instance,
2292 -- the instantiation of the formals appears in the visible part,
2293 -- but the formals are private and remain so.
2295 if Ekind
(Id
) = E_Function
2296 and then Is_Operator_Symbol_Name
(Chars
(Id
))
2297 and then not Is_Hidden
(Id
)
2298 and then not Error_Posted
(Id
)
2300 Set_Is_Potentially_Use_Visible
(Id
,
2302 or else Type_In_Use
(Etype
(Id
))
2303 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
2304 or else (Present
(Next_Formal
(First_Formal
(Id
)))
2307 (Etype
(Next_Formal
(First_Formal
(Id
))))));
2309 if In_Use
(P
) and then not Is_Hidden
(Id
) then
2311 -- A child unit of a use-visible package remains use-visible
2312 -- only if it is itself a visible child unit. Otherwise it
2313 -- would remain visible in other contexts where P is use-
2314 -- visible, because once compiled it stays in the entity list
2315 -- of its parent unit.
2317 if Is_Child_Unit
(Id
) then
2318 Set_Is_Potentially_Use_Visible
2319 (Id
, Is_Visible_Lib_Unit
(Id
));
2321 Set_Is_Potentially_Use_Visible
(Id
);
2325 Set_Is_Potentially_Use_Visible
(Id
, False);
2329 -- Local entities are not immediately visible outside of the package
2331 Set_Is_Immediately_Visible
(Id
, False);
2333 -- If this is a private type with a full view (for example a local
2334 -- subtype of a private type declared elsewhere), ensure that the
2335 -- full view is also removed from visibility: it may be exposed when
2336 -- swapping views in an instantiation.
2338 if Is_Type
(Id
) and then Present
(Full_View
(Id
)) then
2339 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
2342 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2343 Check_Abstract_Overriding
(Id
);
2344 Check_Conventions
(Id
);
2347 if Ekind_In
(Id
, E_Private_Type
, E_Limited_Private_Type
)
2348 and then No
(Full_View
(Id
))
2349 and then not Is_Generic_Type
(Id
)
2350 and then not Is_Derived_Type
(Id
)
2352 Error_Msg_N
("missing full declaration for private type&", Id
);
2354 elsif Ekind
(Id
) = E_Record_Type_With_Private
2355 and then not Is_Generic_Type
(Id
)
2356 and then No
(Full_View
(Id
))
2358 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
2359 Error_Msg_N
("missing full declaration for private type&", Id
);
2362 ("missing full declaration for private extension", Id
);
2365 -- Case of constant, check for deferred constant declaration with
2366 -- no full view. Likely just a matter of a missing expression, or
2367 -- accidental use of the keyword constant.
2369 elsif Ekind
(Id
) = E_Constant
2371 -- OK if constant value present
2373 and then No
(Constant_Value
(Id
))
2375 -- OK if full view present
2377 and then No
(Full_View
(Id
))
2379 -- OK if imported, since that provides the completion
2381 and then not Is_Imported
(Id
)
2383 -- OK if object declaration replaced by renaming declaration as
2384 -- a result of OK_To_Rename processing (e.g. for concatenation)
2386 and then Nkind
(Parent
(Id
)) /= N_Object_Renaming_Declaration
2388 -- OK if object declaration with the No_Initialization flag set
2390 and then not (Nkind
(Parent
(Id
)) = N_Object_Declaration
2391 and then No_Initialization
(Parent
(Id
)))
2393 -- If no private declaration is present, we assume the user did
2394 -- not intend a deferred constant declaration and the problem
2395 -- is simply that the initializing expression is missing.
2397 if not Has_Private_Declaration
(Etype
(Id
)) then
2399 -- We assume that the user did not intend a deferred constant
2400 -- declaration, and the expression is just missing.
2403 ("constant declaration requires initialization expression",
2406 if Is_Limited_Type
(Etype
(Id
)) then
2408 ("\if variable intended, remove CONSTANT from declaration",
2412 -- Otherwise if a private declaration is present, then we are
2413 -- missing the full declaration for the deferred constant.
2417 ("missing full declaration for deferred constant (RM 7.4)",
2420 if Is_Limited_Type
(Etype
(Id
)) then
2422 ("\if variable intended, remove CONSTANT from declaration",
2431 -- If the specification was installed as the parent of a public child
2432 -- unit, the private declarations were not installed, and there is
2435 if not In_Private_Part
(P
) then
2438 Set_In_Private_Part
(P
, False);
2441 -- Make private entities invisible and exchange full and private
2442 -- declarations for private types. Id is now the first private entity
2445 while Present
(Id
) loop
2446 if Debug_Flag_E
then
2447 Write_Str
("unlinking private entity ");
2448 Write_Int
(Int
(Id
));
2452 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2453 Check_Abstract_Overriding
(Id
);
2454 Check_Conventions
(Id
);
2457 Set_Is_Immediately_Visible
(Id
, False);
2459 if Is_Private_Base_Type
(Id
) and then Present
(Full_View
(Id
)) then
2460 Full
:= Full_View
(Id
);
2462 -- If the partial view is not declared in the visible part of the
2463 -- package (as is the case when it is a type derived from some
2464 -- other private type in the private part of the current package),
2465 -- no exchange takes place.
2468 or else List_Containing
(Parent
(Id
)) /=
2469 Visible_Declarations
(Specification
(Decl
))
2474 -- The entry in the private part points to the full declaration,
2475 -- which is currently visible. Exchange them so only the private
2476 -- type declaration remains accessible, and link private and full
2477 -- declaration in the opposite direction. Before the actual
2478 -- exchange, we copy back attributes of the full view that must
2479 -- be available to the partial view too.
2481 Preserve_Full_Attributes
(Id
, Full
);
2483 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
2485 if Is_Indefinite_Subtype
(Full
)
2486 and then not Is_Indefinite_Subtype
(Id
)
2489 ("full view of type must be definite subtype", Full
);
2492 -- Swap out the subtypes and derived types of Id that
2493 -- were compiled in this scope, or installed previously
2494 -- by Install_Private_Declarations.
2496 -- Before we do the swap, we verify the presence of the Full_View
2497 -- field which may be empty due to a swap by a previous call to
2498 -- End_Package_Scope (e.g. from the freezing mechanism).
2500 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2501 while Present
(Priv_Elmt
) loop
2502 Priv_Sub
:= Node
(Priv_Elmt
);
2504 if Present
(Full_View
(Priv_Sub
)) then
2505 if Scope
(Priv_Sub
) = P
2506 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
2508 Set_Is_Immediately_Visible
(Priv_Sub
, False);
2511 if Is_Visible_Dependent
(Priv_Sub
) then
2512 Preserve_Full_Attributes
2513 (Priv_Sub
, Full_View
(Priv_Sub
));
2514 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
2515 Exchange_Declarations
(Priv_Sub
);
2519 Next_Elmt
(Priv_Elmt
);
2522 -- Now restore the type itself to its private view
2524 Exchange_Declarations
(Id
);
2526 -- If we have installed an underlying full view for a type derived
2527 -- from a private type in a child unit, restore the proper views
2528 -- of private and full view. See corresponding code in
2529 -- Install_Private_Declarations.
2531 -- After the exchange, Full denotes the private type in the
2532 -- visible part of the package.
2534 if Is_Private_Base_Type
(Full
)
2535 and then Present
(Full_View
(Full
))
2536 and then Present
(Underlying_Full_View
(Full
))
2537 and then In_Package_Body
(Current_Scope
)
2539 Set_Full_View
(Full
, Underlying_Full_View
(Full
));
2540 Set_Underlying_Full_View
(Full
, Empty
);
2543 elsif Ekind
(Id
) = E_Incomplete_Type
2544 and then Comes_From_Source
(Id
)
2545 and then No
(Full_View
(Id
))
2547 -- Mark Taft amendment types. Verify that there are no primitive
2548 -- operations declared for the type (3.10.1(9)).
2550 Set_Has_Completion_In_Body
(Id
);
2557 Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2558 while Present
(Elmt
) loop
2559 Subp
:= Node
(Elmt
);
2561 -- Is_Primitive is tested because there can be cases where
2562 -- nonprimitive subprograms (in nested packages) are added
2563 -- to the Private_Dependents list.
2565 if Is_Overloadable
(Subp
) and then Is_Primitive
(Subp
) then
2567 ("type& must be completed in the private part",
2570 -- The result type of an access-to-function type cannot be a
2571 -- Taft-amendment type, unless the version is Ada 2012 or
2572 -- later (see AI05-151).
2574 elsif Ada_Version
< Ada_2012
2575 and then Ekind
(Subp
) = E_Subprogram_Type
2577 if Etype
(Subp
) = Id
2579 (Is_Class_Wide_Type
(Etype
(Subp
))
2580 and then Etype
(Etype
(Subp
)) = Id
)
2583 ("type& must be completed in the private part",
2584 Associated_Node_For_Itype
(Subp
), Id
);
2592 elsif not Is_Child_Unit
(Id
)
2593 and then (not Is_Private_Type
(Id
) or else No
(Full_View
(Id
)))
2596 Set_Is_Potentially_Use_Visible
(Id
, False);
2602 end Uninstall_Declarations
;
2604 ------------------------
2605 -- Unit_Requires_Body --
2606 ------------------------
2608 function Unit_Requires_Body
2610 Ignore_Abstract_State
: Boolean := False) return Boolean
2615 -- Imported entity never requires body. Right now, only subprograms can
2616 -- be imported, but perhaps in the future we will allow import of
2619 if Is_Imported
(P
) then
2622 -- Body required if library package with pragma Elaborate_Body
2624 elsif Has_Pragma_Elaborate_Body
(P
) then
2627 -- Body required if subprogram
2629 elsif Is_Subprogram
(P
) or else Is_Generic_Subprogram
(P
) then
2632 -- Treat a block as requiring a body
2634 elsif Ekind
(P
) = E_Block
then
2637 elsif Ekind
(P
) = E_Package
2638 and then Nkind
(Parent
(P
)) = N_Package_Specification
2639 and then Present
(Generic_Parent
(Parent
(P
)))
2642 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(P
));
2644 if Has_Pragma_Elaborate_Body
(G_P
) then
2649 -- A [generic] package that introduces at least one non-null abstract
2650 -- state requires completion. However, there is a separate rule that
2651 -- requires that such a package have a reason other than this for a
2652 -- body being required (if necessary a pragma Elaborate_Body must be
2653 -- provided). If Ignore_Abstract_State is True, we don't do this check
2654 -- (so we can use Unit_Requires_Body to check for some other reason).
2656 elsif Ekind_In
(P
, E_Generic_Package
, E_Package
)
2657 and then not Ignore_Abstract_State
2658 and then Present
(Abstract_States
(P
))
2660 not Is_Null_State
(Node
(First_Elmt
(Abstract_States
(P
))))
2665 -- Otherwise search entity chain for entity requiring completion
2667 E
:= First_Entity
(P
);
2668 while Present
(E
) loop
2670 -- Always ignore child units. Child units get added to the entity
2671 -- list of a parent unit, but are not original entities of the
2672 -- parent, and so do not affect whether the parent needs a body.
2674 if Is_Child_Unit
(E
) then
2677 -- Ignore formal packages and their renamings
2679 elsif Ekind
(E
) = E_Package
2680 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
2681 N_Formal_Package_Declaration
2685 -- Otherwise test to see if entity requires a completion.
2686 -- Note that subprogram entities whose declaration does not come
2687 -- from source are ignored here on the basis that we assume the
2688 -- expander will provide an implicit completion at some point.
2690 elsif (Is_Overloadable
(E
)
2691 and then Ekind
(E
) /= E_Enumeration_Literal
2692 and then Ekind
(E
) /= E_Operator
2693 and then not Is_Abstract_Subprogram
(E
)
2694 and then not Has_Completion
(E
)
2695 and then Comes_From_Source
(Parent
(E
)))
2698 (Ekind
(E
) = E_Package
2700 and then not Has_Completion
(E
)
2701 and then Unit_Requires_Body
(E
))
2704 (Ekind
(E
) = E_Incomplete_Type
2705 and then No
(Full_View
(E
))
2706 and then not Is_Generic_Type
(E
))
2709 (Ekind_In
(E
, E_Task_Type
, E_Protected_Type
)
2710 and then not Has_Completion
(E
))
2713 (Ekind
(E
) = E_Generic_Package
2715 and then not Has_Completion
(E
)
2716 and then Unit_Requires_Body
(E
))
2719 (Is_Generic_Subprogram
(E
)
2720 and then not Has_Completion
(E
))
2725 -- Entity that does not require completion
2735 end Unit_Requires_Body
;
2737 -----------------------------
2738 -- Unit_Requires_Body_Info --
2739 -----------------------------
2741 procedure Unit_Requires_Body_Info
(P
: Entity_Id
) is
2745 -- Imported entity never requires body. Right now, only subprograms can
2746 -- be imported, but perhaps in the future we will allow import of
2749 if Is_Imported
(P
) then
2752 -- Body required if library package with pragma Elaborate_Body
2754 elsif Has_Pragma_Elaborate_Body
(P
) then
2756 ("?Y?info: & requires body (Elaborate_Body)", P
);
2758 -- Body required if subprogram
2760 elsif Is_Subprogram
(P
) or else Is_Generic_Subprogram
(P
) then
2761 Error_Msg_N
("?Y?info: & requires body (subprogram case)", P
);
2763 -- Body required if generic parent has Elaborate_Body
2765 elsif Ekind
(P
) = E_Package
2766 and then Nkind
(Parent
(P
)) = N_Package_Specification
2767 and then Present
(Generic_Parent
(Parent
(P
)))
2770 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(P
));
2772 if Has_Pragma_Elaborate_Body
(G_P
) then
2774 ("?Y?info: & requires body (generic parent Elaborate_Body)",
2779 -- A [generic] package that introduces at least one non-null abstract
2780 -- state requires completion. However, there is a separate rule that
2781 -- requires that such a package have a reason other than this for a
2782 -- body being required (if necessary a pragma Elaborate_Body must be
2783 -- provided). If Ignore_Abstract_State is True, we don't do this check
2784 -- (so we can use Unit_Requires_Body to check for some other reason).
2786 elsif Ekind_In
(P
, E_Generic_Package
, E_Package
)
2787 and then Present
(Abstract_States
(P
))
2789 not Is_Null_State
(Node
(First_Elmt
(Abstract_States
(P
))))
2792 ("?Y?info: & requires body (non-null abstract state aspect)",
2796 -- Otherwise search entity chain for entity requiring completion
2798 E
:= First_Entity
(P
);
2799 while Present
(E
) loop
2801 -- Always ignore child units. Child units get added to the entity
2802 -- list of a parent unit, but are not original entities of the
2803 -- parent, and so do not affect whether the parent needs a body.
2805 if Is_Child_Unit
(E
) then
2808 -- Ignore formal packages and their renamings
2810 elsif Ekind
(E
) = E_Package
2811 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
2812 N_Formal_Package_Declaration
2816 -- Otherwise test to see if entity requires a completion.
2817 -- Note that subprogram entities whose declaration does not come
2818 -- from source are ignored here on the basis that we assume the
2819 -- expander will provide an implicit completion at some point.
2821 elsif (Is_Overloadable
(E
)
2822 and then Ekind
(E
) /= E_Enumeration_Literal
2823 and then Ekind
(E
) /= E_Operator
2824 and then not Is_Abstract_Subprogram
(E
)
2825 and then not Has_Completion
(E
)
2826 and then Comes_From_Source
(Parent
(E
)))
2829 (Ekind
(E
) = E_Package
2831 and then not Has_Completion
(E
)
2832 and then Unit_Requires_Body
(E
))
2835 (Ekind
(E
) = E_Incomplete_Type
2836 and then No
(Full_View
(E
))
2837 and then not Is_Generic_Type
(E
))
2840 (Ekind_In
(E
, E_Task_Type
, E_Protected_Type
)
2841 and then not Has_Completion
(E
))
2844 (Ekind
(E
) = E_Generic_Package
2846 and then not Has_Completion
(E
)
2847 and then Unit_Requires_Body
(E
))
2850 (Is_Generic_Subprogram
(E
)
2851 and then not Has_Completion
(E
))
2854 Error_Msg_Node_2
:= E
;
2856 ("?Y?info: & requires body (& requires completion)",
2859 -- Entity that does not require completion
2867 end Unit_Requires_Body_Info
;