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_Prag
; use Sem_Prag
;
60 with Sem_Util
; use Sem_Util
;
61 with Sem_Warn
; use Sem_Warn
;
62 with Snames
; use Snames
;
63 with Stand
; use Stand
;
64 with Sinfo
; use Sinfo
;
65 with Sinput
; use Sinput
;
67 with Uintp
; use Uintp
;
69 package body Sem_Ch7
is
71 -----------------------------------
72 -- Handling private declarations --
73 -----------------------------------
75 -- The principle that each entity has a single defining occurrence clashes
76 -- with the presence of two separate definitions for private types: the
77 -- first is the private type declaration, and the second is the full type
78 -- declaration. It is important that all references to the type point to
79 -- the same defining occurrence, namely the first one. To enforce the two
80 -- separate views of the entity, the corresponding information is swapped
81 -- between the two declarations. Outside of the package, the defining
82 -- occurrence only contains the private declaration information, while in
83 -- the private part and the body of the package the defining occurrence
84 -- contains the full declaration. To simplify the swap, the defining
85 -- occurrence that currently holds the private declaration points to the
86 -- full declaration. During semantic processing the defining occurrence
87 -- also points to a list of private dependents, that is to say access types
88 -- or composite types whose designated types or component types are
89 -- subtypes or derived types of the private type in question. After the
90 -- full declaration has been seen, the private dependents are updated to
91 -- indicate that they have full definitions.
93 -----------------------
94 -- Local Subprograms --
95 -----------------------
97 procedure Analyze_Package_Body_Helper
(N
: Node_Id
);
98 -- Does all the real work of Analyze_Package_Body
100 procedure Check_Anonymous_Access_Types
101 (Spec_Id
: Entity_Id
;
103 -- If the spec of a package has a limited_with_clause, it may declare
104 -- anonymous access types whose designated type is a limited view, such an
105 -- anonymous access return type for a function. This access type cannot be
106 -- elaborated in the spec itself, but it may need an itype reference if it
107 -- is used within a nested scope. In that case the itype reference is
108 -- created at the beginning of the corresponding package body and inserted
109 -- before other body declarations.
111 procedure Install_Package_Entity
(Id
: Entity_Id
);
112 -- Supporting procedure for Install_{Visible,Private}_Declarations. Places
113 -- one entity on its visibility chain, and recurses on the visible part if
114 -- the entity is an inner package.
116 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
117 -- True for a private type that is not a subtype
119 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
120 -- If the private dependent is a private type whose full view is derived
121 -- from the parent type, its full properties are revealed only if we are in
122 -- the immediate scope of the private dependent. Should this predicate be
123 -- tightened further???
125 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
126 -- Called upon entering the private part of a public child package and the
127 -- body of a nested package, to potentially declare certain inherited
128 -- subprograms that were inherited by types in the visible part, but whose
129 -- declaration was deferred because the parent operation was private and
130 -- not visible at that point. These subprograms are located by traversing
131 -- the visible part declarations looking for non-private type extensions
132 -- and then examining each of the primitive operations of such types to
133 -- find those that were inherited but declared with a special internal
134 -- name. Each such operation is now declared as an operation with a normal
135 -- name (using the name of the parent operation) and replaces the previous
136 -- implicit operation in the primitive operations list of the type. If the
137 -- inherited private operation has been overridden, then it's replaced by
138 -- the overriding operation.
140 procedure Unit_Requires_Body_Info
(P
: Entity_Id
);
141 -- Outputs info messages showing why package specification P requires a
142 -- body. Caller has checked that the switch requesting this information
143 -- is set, and that the package does indeed require a body.
145 --------------------------
146 -- Analyze_Package_Body --
147 --------------------------
149 procedure Analyze_Package_Body
(N
: Node_Id
) is
150 Loc
: constant Source_Ptr
:= Sloc
(N
);
154 Write_Str
("==> package body ");
155 Write_Name
(Chars
(Defining_Entity
(N
)));
156 Write_Str
(" from ");
157 Write_Location
(Loc
);
162 -- The real work is split out into the helper, so it can do "return;"
163 -- without skipping the debug output.
165 Analyze_Package_Body_Helper
(N
);
169 Write_Str
("<== package body ");
170 Write_Name
(Chars
(Defining_Entity
(N
)));
171 Write_Str
(" from ");
172 Write_Location
(Loc
);
175 end Analyze_Package_Body
;
177 -----------------------------------
178 -- Analyze_Package_Body_Contract --
179 -----------------------------------
181 procedure Analyze_Package_Body_Contract
(Body_Id
: Entity_Id
) is
182 Spec_Id
: constant Entity_Id
:= Spec_Entity
(Body_Id
);
186 Prag
:= Get_Pragma
(Body_Id
, Pragma_Refined_State
);
188 -- The analysis of pragma Refined_State detects whether the spec has
189 -- abstract states available for refinement.
191 if Present
(Prag
) then
192 Analyze_Refined_State_In_Decl_Part
(Prag
);
194 -- State refinement is required when the package declaration has
195 -- abstract states. Null states are not considered.
197 elsif Requires_State_Refinement
(Spec_Id
, Body_Id
) then
198 Error_Msg_N
("package & requires state refinement", Spec_Id
);
200 end Analyze_Package_Body_Contract
;
202 ---------------------------------
203 -- Analyze_Package_Body_Helper --
204 ---------------------------------
206 procedure Analyze_Package_Body_Helper
(N
: Node_Id
) is
210 Last_Spec_Entity
: Entity_Id
;
214 procedure Install_Composite_Operations
(P
: Entity_Id
);
215 -- Composite types declared in the current scope may depend on types
216 -- that were private at the point of declaration, and whose full view
217 -- is now in scope. Indicate that the corresponding operations on the
218 -- composite type are available.
220 ----------------------------------
221 -- Install_Composite_Operations --
222 ----------------------------------
224 procedure Install_Composite_Operations
(P
: Entity_Id
) is
228 Id
:= First_Entity
(P
);
229 while Present
(Id
) loop
231 and then (Is_Limited_Composite
(Id
)
232 or else Is_Private_Composite
(Id
))
233 and then No
(Private_Component
(Id
))
235 Set_Is_Limited_Composite
(Id
, False);
236 Set_Is_Private_Composite
(Id
, False);
241 end Install_Composite_Operations
;
243 -- Start of processing for Analyze_Package_Body_Helper
246 -- Find corresponding package specification, and establish the current
247 -- scope. The visible defining entity for the package is the defining
248 -- occurrence in the spec. On exit from the package body, all body
249 -- declarations are attached to the defining entity for the body, but
250 -- the later is never used for name resolution. In this fashion there
251 -- is only one visible entity that denotes the package.
253 -- Set Body_Id. Note that this will be reset to point to the generic
254 -- copy later on in the generic case.
256 Body_Id
:= Defining_Entity
(N
);
258 -- Body is body of package instantiation. Corresponding spec has already
261 if Present
(Corresponding_Spec
(N
)) then
262 Spec_Id
:= Corresponding_Spec
(N
);
263 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
266 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
269 and then Is_Package_Or_Generic_Package
(Spec_Id
)
271 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
273 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
274 Error_Msg_N
("cannot supply body for package renaming", N
);
277 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
278 Error_Msg_N
("redefinition of package body", N
);
283 Error_Msg_N
("missing specification for package body", N
);
287 if Is_Package_Or_Generic_Package
(Spec_Id
)
288 and then (Scope
(Spec_Id
) = Standard_Standard
289 or else Is_Child_Unit
(Spec_Id
))
290 and then not Unit_Requires_Body
(Spec_Id
)
292 if Ada_Version
= Ada_83
then
294 ("optional package body (not allowed in Ada 95)??", N
);
296 Error_Msg_N
("spec of this package does not allow a body", N
);
301 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
302 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
304 if Is_Child_Unit
(Spec_Id
) then
305 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
307 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
310 Set_Is_Child_Unit
(Body_Id
);
313 -- Generic package case
315 if Ekind
(Spec_Id
) = E_Generic_Package
then
317 -- Disable expansion and perform semantic analysis on copy. The
318 -- unannotated body will be used in all instantiations.
320 Body_Id
:= Defining_Entity
(N
);
321 Set_Ekind
(Body_Id
, E_Package_Body
);
322 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
323 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
324 Set_Body_Entity
(Spec_Id
, Body_Id
);
325 Set_Spec_Entity
(Body_Id
, Spec_Id
);
327 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
330 -- Update Body_Id to point to the copied node for the remainder of
333 Body_Id
:= Defining_Entity
(N
);
337 -- The Body_Id is that of the copied node in the generic case, the
338 -- current node otherwise. Note that N was rewritten above, so we must
339 -- be sure to get the latest Body_Id value.
341 Set_Ekind
(Body_Id
, E_Package_Body
);
342 Set_Body_Entity
(Spec_Id
, Body_Id
);
343 Set_Spec_Entity
(Body_Id
, Spec_Id
);
344 Set_Contract
(Body_Id
, Make_Contract
(Sloc
(Body_Id
)));
346 -- Defining name for the package body is not a visible entity: Only the
347 -- defining name for the declaration is visible.
349 Set_Etype
(Body_Id
, Standard_Void_Type
);
350 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
351 Set_Corresponding_Spec
(N
, Spec_Id
);
352 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
354 -- The body entity is not used for semantics or code generation, but
355 -- it is attached to the entity list of the enclosing scope to simplify
356 -- the listing of back-annotations for the types it main contain.
358 if Scope
(Spec_Id
) /= Standard_Standard
then
359 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
362 -- Indicate that we are currently compiling the body of the package
364 Set_In_Package_Body
(Spec_Id
);
365 Set_Has_Completion
(Spec_Id
);
366 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
368 if Has_Aspects
(N
) then
369 Analyze_Aspect_Specifications
(N
, Body_Id
);
372 Push_Scope
(Spec_Id
);
374 -- Set SPARK_Mode only for non-generic package
376 if Ekind
(Spec_Id
) = E_Package
then
378 -- Set SPARK_Mode from context
380 Set_SPARK_Pragma
(Body_Id
, SPARK_Mode_Pragma
);
381 Set_SPARK_Pragma_Inherited
(Body_Id
, True);
383 -- Set elaboration code SPARK mode the same for now
385 Set_SPARK_Aux_Pragma
(Body_Id
, SPARK_Pragma
(Body_Id
));
386 Set_SPARK_Aux_Pragma_Inherited
(Body_Id
, True);
389 Set_Categorization_From_Pragmas
(N
);
391 Install_Visible_Declarations
(Spec_Id
);
392 Install_Private_Declarations
(Spec_Id
);
393 Install_Private_With_Clauses
(Spec_Id
);
394 Install_Composite_Operations
(Spec_Id
);
396 Check_Anonymous_Access_Types
(Spec_Id
, N
);
398 if Ekind
(Spec_Id
) = E_Generic_Package
then
399 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
402 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
403 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
405 -- This is a nested package, so it may be necessary to declare certain
406 -- inherited subprograms that are not yet visible because the parent
407 -- type's subprograms are now visible.
409 if Ekind
(Scope
(Spec_Id
)) = E_Package
410 and then Scope
(Spec_Id
) /= Standard_Standard
412 Declare_Inherited_Private_Subprograms
(Spec_Id
);
415 if Present
(Declarations
(N
)) then
416 Analyze_Declarations
(Declarations
(N
));
417 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
420 -- After declarations have been analyzed, the body has been set to have
421 -- the final value of SPARK_Mode. Check that the SPARK_Mode for the body
422 -- is consistent with the SPARK_Mode for the spec.
424 if Present
(SPARK_Pragma
(Body_Id
)) then
425 if Present
(SPARK_Aux_Pragma
(Spec_Id
)) then
426 if Get_SPARK_Mode_From_Pragma
(SPARK_Aux_Pragma
(Spec_Id
)) = Off
428 Get_SPARK_Mode_From_Pragma
(SPARK_Pragma
(Body_Id
)) = On
430 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
431 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
432 Error_Msg_Sloc
:= Sloc
(SPARK_Aux_Pragma
(Spec_Id
));
434 ("\value Off was set for SPARK_Mode on & #", N
, Spec_Id
);
438 Error_Msg_Sloc
:= Sloc
(SPARK_Pragma
(Body_Id
));
439 Error_Msg_N
("incorrect application of SPARK_Mode#", N
);
440 Error_Msg_Sloc
:= Sloc
(Spec_Id
);
442 ("\no value was set for SPARK_Mode on & #", N
, Spec_Id
);
446 -- Analyze_Declarations has caused freezing of all types. Now generate
447 -- bodies for RACW primitives and stream attributes, if any.
449 if Ekind
(Spec_Id
) = E_Package
and then Has_RACW
(Spec_Id
) then
451 -- Attach subprogram bodies to support RACWs declared in spec
453 Append_RACW_Bodies
(Declarations
(N
), Spec_Id
);
454 Analyze_List
(Declarations
(N
));
457 HSS
:= Handled_Statement_Sequence
(N
);
459 if Present
(HSS
) then
460 Process_End_Label
(HSS
, 't', Spec_Id
);
463 -- Check that elaboration code in a preelaborable package body is
464 -- empty other than null statements and labels (RM 10.2.1(6)).
466 Validate_Null_Statement_Sequence
(N
);
469 Validate_Categorization_Dependency
(N
, Spec_Id
);
470 Check_Completion
(Body_Id
);
472 -- Generate start of body reference. Note that we do this fairly late,
473 -- because the call will use In_Extended_Main_Source_Unit as a check,
474 -- and we want to make sure that Corresponding_Stub links are set
476 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
478 -- For a generic package, collect global references and mark them on
479 -- the original body so that they are not resolved again at the point
482 if Ekind
(Spec_Id
) /= E_Package
then
483 Save_Global_References
(Original_Node
(N
));
487 -- The entities of the package body have so far been chained onto the
488 -- declaration chain for the spec. That's been fine while we were in the
489 -- body, since we wanted them to be visible, but now that we are leaving
490 -- the package body, they are no longer visible, so we remove them from
491 -- the entity chain of the package spec entity, and copy them to the
492 -- entity chain of the package body entity, where they will never again
495 if Present
(Last_Spec_Entity
) then
496 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
497 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
498 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
499 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
502 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
503 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
504 Set_First_Entity
(Spec_Id
, Empty
);
505 Set_Last_Entity
(Spec_Id
, Empty
);
508 End_Package_Scope
(Spec_Id
);
510 -- All entities declared in body are not visible
516 E
:= First_Entity
(Body_Id
);
517 while Present
(E
) loop
518 Set_Is_Immediately_Visible
(E
, False);
519 Set_Is_Potentially_Use_Visible
(E
, False);
522 -- Child units may appear on the entity list (e.g. if they appear
523 -- in the context of a subunit) but they are not body entities.
525 if not Is_Child_Unit
(E
) then
526 Set_Is_Package_Body_Entity
(E
);
533 Check_References
(Body_Id
);
535 -- For a generic unit, check that the formal parameters are referenced,
536 -- and that local variables are used, as for regular packages.
538 if Ekind
(Spec_Id
) = E_Generic_Package
then
539 Check_References
(Spec_Id
);
542 -- The processing so far has made all entities of the package body
543 -- public (i.e. externally visible to the linker). This is in general
544 -- necessary, since inlined or generic bodies, for which code is
545 -- generated in other units, may need to see these entities. The
546 -- following loop runs backwards from the end of the entities of the
547 -- package body making these entities invisible until we reach a
548 -- referencer, i.e. a declaration that could reference a previous
549 -- declaration, a generic body or an inlined body, or a stub (which may
550 -- contain either of these). This is of course an approximation, but it
551 -- is conservative and definitely correct.
553 -- We only do this at the outer (library) level non-generic packages.
554 -- The reason is simply to cut down on the number of global symbols
555 -- generated, which has a double effect: (1) to make the compilation
556 -- process more efficient and (2) to give the code generator more
557 -- freedom to optimize within each unit, especially subprograms.
559 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
560 and then not Is_Generic_Unit
(Spec_Id
)
561 and then Present
(Declarations
(N
))
563 Make_Non_Public_Where_Possible
: declare
565 function Has_Referencer
567 Outer
: Boolean) return Boolean;
568 -- Traverse given list of declarations in reverse order. Return
569 -- True if a referencer is present. Return False if none is found.
571 -- The Outer parameter is True for the outer level call and False
572 -- for inner level calls for nested packages. If Outer is True,
573 -- then any entities up to the point of hitting a referencer get
574 -- their Is_Public flag cleared, so that the entities will be
575 -- treated as static entities in the C sense, and need not have
576 -- fully qualified names. Furthermore, if the referencer is an
577 -- inlined subprogram that doesn't reference other subprograms,
578 -- we keep clearing the Is_Public flag on subprograms. For inner
579 -- levels, we need all names to be fully qualified to deal with
580 -- the same name appearing in parallel packages (right now this
581 -- is tied to their being external).
587 function Has_Referencer
589 Outer
: Boolean) return Boolean
591 Has_Referencer_Except_For_Subprograms
: Boolean := False;
598 function Check_Subprogram_Ref
(N
: Node_Id
)
599 return Traverse_Result
;
600 -- Look for references to subprograms
602 --------------------------
603 -- Check_Subprogram_Ref --
604 --------------------------
606 function Check_Subprogram_Ref
(N
: Node_Id
)
607 return Traverse_Result
612 -- Check name of procedure or function calls
614 if Nkind
(N
) in N_Subprogram_Call
615 and then Is_Entity_Name
(Name
(N
))
620 -- Check prefix of attribute references
622 if Nkind
(N
) = N_Attribute_Reference
623 and then Is_Entity_Name
(Prefix
(N
))
624 and then Present
(Entity
(Prefix
(N
)))
625 and then Ekind
(Entity
(Prefix
(N
))) in Subprogram_Kind
630 -- Check value of constants
632 if Nkind
(N
) = N_Identifier
633 and then Present
(Entity
(N
))
634 and then Ekind
(Entity
(N
)) = E_Constant
636 V
:= Constant_Value
(Entity
(N
));
639 and then not Compile_Time_Known_Value_Or_Aggr
(V
)
646 end Check_Subprogram_Ref
;
648 function Check_Subprogram_Refs
is
649 new Traverse_Func
(Check_Subprogram_Ref
);
651 -- Start of processing for Has_Referencer
659 while Present
(D
) loop
662 if K
in N_Body_Stub
then
665 -- Processing for subprogram bodies
667 elsif K
= N_Subprogram_Body
then
668 if Acts_As_Spec
(D
) then
669 E
:= Defining_Entity
(D
);
671 -- An inlined body acts as a referencer. Note also
672 -- that we never reset Is_Public for an inlined
673 -- subprogram. Gigi requires Is_Public to be set.
675 -- Note that we test Has_Pragma_Inline here rather
676 -- than Is_Inlined. We are compiling this for a
677 -- client, and it is the client who will decide if
678 -- actual inlining should occur, so we need to assume
679 -- that the procedure could be inlined for the purpose
680 -- of accessing global entities.
682 if Has_Pragma_Inline
(E
) then
684 and then Check_Subprogram_Refs
(D
) = OK
686 Has_Referencer_Except_For_Subprograms
:= True;
691 Set_Is_Public
(E
, False);
695 E
:= Corresponding_Spec
(D
);
699 -- A generic subprogram body acts as a referencer
701 if Is_Generic_Unit
(E
) then
705 if Has_Pragma_Inline
(E
) or else Is_Inlined
(E
) then
707 and then Check_Subprogram_Refs
(D
) = OK
709 Has_Referencer_Except_For_Subprograms
:= True;
717 -- Processing for package bodies
719 elsif K
= N_Package_Body
720 and then Present
(Corresponding_Spec
(D
))
722 E
:= Corresponding_Spec
(D
);
724 -- Generic package body is a referencer. It would seem
725 -- that we only have to consider generics that can be
726 -- exported, i.e. where the corresponding spec is the
727 -- spec of the current package, but because of nested
728 -- instantiations, a fully private generic body may
729 -- export other private body entities. Furthermore,
730 -- regardless of whether there was a previous inlined
731 -- subprogram, (an instantiation of) the generic package
732 -- may reference any entity declared before it.
734 if Is_Generic_Unit
(E
) then
737 -- For non-generic package body, recurse into body unless
738 -- this is an instance, we ignore instances since they
739 -- cannot have references that affect outer entities.
741 elsif not Is_Generic_Instance
(E
)
742 and then not Has_Referencer_Except_For_Subprograms
745 (Declarations
(D
), Outer
=> False)
751 -- Processing for package specs, recurse into declarations.
752 -- Again we skip this for the case of generic instances.
754 elsif K
= N_Package_Declaration
755 and then not Has_Referencer_Except_For_Subprograms
757 S
:= Specification
(D
);
759 if not Is_Generic_Unit
(Defining_Entity
(S
)) then
761 (Private_Declarations
(S
), Outer
=> False)
765 (Visible_Declarations
(S
), Outer
=> False)
771 -- Objects and exceptions need not be public if we have not
772 -- encountered a referencer so far. We only reset the flag
773 -- for outer level entities that are not imported/exported,
774 -- and which have no interface name.
776 elsif Nkind_In
(K
, N_Object_Declaration
,
777 N_Exception_Declaration
,
778 N_Subprogram_Declaration
)
780 E
:= Defining_Entity
(D
);
783 and then (not Has_Referencer_Except_For_Subprograms
784 or else K
= N_Subprogram_Declaration
)
785 and then not Is_Imported
(E
)
786 and then not Is_Exported
(E
)
787 and then No
(Interface_Name
(E
))
789 Set_Is_Public
(E
, False);
796 return Has_Referencer_Except_For_Subprograms
;
799 -- Start of processing for Make_Non_Public_Where_Possible
804 pragma Warnings
(Off
, Discard
);
807 Discard
:= Has_Referencer
(Declarations
(N
), Outer
=> True);
809 end Make_Non_Public_Where_Possible
;
812 -- If expander is not active, then here is where we turn off the
813 -- In_Package_Body flag, otherwise it is turned off at the end of the
814 -- corresponding expansion routine. If this is an instance body, we need
815 -- to qualify names of local entities, because the body may have been
816 -- compiled as a preliminary to another instantiation.
818 if not Expander_Active
then
819 Set_In_Package_Body
(Spec_Id
, False);
821 if Is_Generic_Instance
(Spec_Id
)
822 and then Operating_Mode
= Generate_Code
824 Qualify_Entity_Names
(N
);
827 end Analyze_Package_Body_Helper
;
829 ------------------------------
830 -- Analyze_Package_Contract --
831 ------------------------------
833 procedure Analyze_Package_Contract
(Pack_Id
: Entity_Id
) is
837 -- Analyze the initialization related pragmas. Initializes must come
838 -- before Initial_Condition due to item dependencies.
840 Prag
:= Get_Pragma
(Pack_Id
, Pragma_Initializes
);
842 if Present
(Prag
) then
843 Analyze_Initializes_In_Decl_Part
(Prag
);
846 Prag
:= Get_Pragma
(Pack_Id
, Pragma_Initial_Condition
);
848 if Present
(Prag
) then
849 Analyze_Initial_Condition_In_Decl_Part
(Prag
);
852 -- Check whether the lack of indicator Part_Of agrees with the placement
853 -- of the package instantiation with respect to the state space.
855 if Is_Generic_Instance
(Pack_Id
) then
856 Prag
:= Get_Pragma
(Pack_Id
, Pragma_Part_Of
);
859 Check_Missing_Part_Of
(Pack_Id
);
862 end Analyze_Package_Contract
;
864 ---------------------------------
865 -- Analyze_Package_Declaration --
866 ---------------------------------
868 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
869 Id
: constant Node_Id
:= Defining_Entity
(N
);
872 -- True when in the context of a declared pure library unit
874 Body_Required
: Boolean;
875 -- True when this package declaration requires a corresponding body
878 -- True when this package declaration is not a nested declaration
882 Write_Str
("==> package spec ");
883 Write_Name
(Chars
(Id
));
884 Write_Str
(" from ");
885 Write_Location
(Sloc
(N
));
890 Generate_Definition
(Id
);
892 Set_Ekind
(Id
, E_Package
);
893 Set_Etype
(Id
, Standard_Void_Type
);
894 Set_Contract
(Id
, Make_Contract
(Sloc
(Id
)));
896 -- Set SPARK_Mode from context only for non-generic package
898 if Ekind
(Id
) = E_Package
then
899 Set_SPARK_Pragma
(Id
, SPARK_Mode_Pragma
);
900 Set_SPARK_Aux_Pragma
(Id
, SPARK_Mode_Pragma
);
901 Set_SPARK_Pragma_Inherited
(Id
, True);
902 Set_SPARK_Aux_Pragma_Inherited
(Id
, True);
905 -- Analyze aspect specifications immediately, since we need to recognize
906 -- things like Pure early enough to diagnose violations during analysis.
908 if Has_Aspects
(N
) then
909 Analyze_Aspect_Specifications
(N
, Id
);
912 -- Ada 2005 (AI-217): Check if the package has been erroneously named
913 -- in a limited-with clause of its own context. In this case the error
914 -- has been previously notified by Analyze_Context.
916 -- limited with Pkg; -- ERROR
917 -- package Pkg is ...
919 if From_Limited_With
(Id
) then
925 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
926 Set_Is_Pure
(Id
, PF
);
928 Set_Categorization_From_Pragmas
(N
);
930 Analyze
(Specification
(N
));
931 Validate_Categorization_Dependency
(N
, Id
);
933 Body_Required
:= Unit_Requires_Body
(Id
);
935 -- When this spec does not require an explicit body, we know that there
936 -- are no entities requiring completion in the language sense; we call
937 -- Check_Completion here only to ensure that any nested package
938 -- declaration that requires an implicit body gets one. (In the case
939 -- where a body is required, Check_Completion is called at the end of
940 -- the body's declarative part.)
942 if not Body_Required
then
946 Comp_Unit
:= Nkind
(Parent
(N
)) = N_Compilation_Unit
;
949 -- Set Body_Required indication on the compilation unit node, and
950 -- determine whether elaboration warnings may be meaningful on it.
952 Set_Body_Required
(Parent
(N
), Body_Required
);
954 if not Body_Required
then
955 Set_Suppress_Elaboration_Warnings
(Id
);
960 End_Package_Scope
(Id
);
962 -- For the declaration of a library unit that is a remote types package,
963 -- check legality rules regarding availability of stream attributes for
964 -- types that contain non-remote access values. This subprogram performs
965 -- visibility tests that rely on the fact that we have exited the scope
969 Validate_RT_RAT_Component
(N
);
974 Write_Str
("<== package spec ");
975 Write_Name
(Chars
(Id
));
976 Write_Str
(" from ");
977 Write_Location
(Sloc
(N
));
980 end Analyze_Package_Declaration
;
982 -----------------------------------
983 -- Analyze_Package_Specification --
984 -----------------------------------
986 -- Note that this code is shared for the analysis of generic package specs
987 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
989 procedure Analyze_Package_Specification
(N
: Node_Id
) is
990 Id
: constant Entity_Id
:= Defining_Entity
(N
);
991 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
992 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
993 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
996 Public_Child
: Boolean;
998 Private_With_Clauses_Installed
: Boolean := False;
999 -- In Ada 2005, private with_clauses are visible in the private part
1000 -- of a nested package, even if it appears in the public part of the
1001 -- enclosing package. This requires a separate step to install these
1002 -- private_with_clauses, and remove them at the end of the nested
1005 procedure Check_One_Tagged_Type_Or_Extension_At_Most
;
1006 -- Issue an error in SPARK mode if a package specification contains
1007 -- more than one tagged type or type extension.
1009 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
1010 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
1011 -- Is_True_Constant) on all variables that are entities of Id, and on
1012 -- the chain whose first element is FE. A recursive call is made for all
1013 -- packages and generic packages.
1015 procedure Generate_Parent_References
;
1016 -- For a child unit, generate references to parent units, for
1017 -- GPS navigation purposes.
1019 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
1020 -- Child and Unit are entities of compilation units. True if Child
1021 -- is a public child of Parent as defined in 10.1.1
1023 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
1024 -- Reject completion of an incomplete or private type declarations
1025 -- having a known discriminant part by an unchecked union.
1027 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
1028 -- Given the package entity of a generic package instantiation or
1029 -- formal package whose corresponding generic is a child unit, installs
1030 -- the private declarations of each of the child unit's parents.
1031 -- This has to be done at the point of entering the instance package's
1032 -- private part rather than being done in Sem_Ch12.Install_Parent
1033 -- (which is where the parents' visible declarations are installed).
1035 ------------------------------------------------
1036 -- Check_One_Tagged_Type_Or_Extension_At_Most --
1037 ------------------------------------------------
1039 procedure Check_One_Tagged_Type_Or_Extension_At_Most
is
1042 procedure Check_Decls
(Decls
: List_Id
);
1043 -- Check that either Previous is Empty and Decls does not contain
1044 -- more than one tagged type or type extension, or Previous is
1045 -- already set and Decls contains no tagged type or type extension.
1051 procedure Check_Decls
(Decls
: List_Id
) is
1055 Decl
:= First
(Decls
);
1056 while Present
(Decl
) loop
1057 if Nkind
(Decl
) = N_Full_Type_Declaration
1058 and then Is_Tagged_Type
(Defining_Identifier
(Decl
))
1060 if No
(Previous
) then
1064 Error_Msg_Sloc
:= Sloc
(Previous
);
1065 Check_SPARK_Restriction
1066 ("at most one tagged type or type extension allowed",
1067 "\\ previous declaration#",
1076 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
1080 Check_Decls
(Vis_Decls
);
1082 if Present
(Priv_Decls
) then
1083 Check_Decls
(Priv_Decls
);
1085 end Check_One_Tagged_Type_Or_Extension_At_Most
;
1087 ---------------------
1088 -- Clear_Constants --
1089 ---------------------
1091 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
1095 -- Ignore package renamings, not interesting and they can cause self
1096 -- referential loops in the code below.
1098 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
1102 -- Note: in the loop below, the check for Next_Entity pointing back
1103 -- to the package entity may seem odd, but it is needed, because a
1104 -- package can contain a renaming declaration to itself, and such
1105 -- renamings are generated automatically within package instances.
1108 while Present
(E
) and then E
/= Id
loop
1109 if Is_Assignable
(E
) then
1110 Set_Never_Set_In_Source
(E
, False);
1111 Set_Is_True_Constant
(E
, False);
1112 Set_Current_Value
(E
, Empty
);
1113 Set_Is_Known_Null
(E
, False);
1114 Set_Last_Assignment
(E
, Empty
);
1116 if not Can_Never_Be_Null
(E
) then
1117 Set_Is_Known_Non_Null
(E
, False);
1120 elsif Is_Package_Or_Generic_Package
(E
) then
1121 Clear_Constants
(E
, First_Entity
(E
));
1122 Clear_Constants
(E
, First_Private_Entity
(E
));
1127 end Clear_Constants
;
1129 --------------------------------
1130 -- Generate_Parent_References --
1131 --------------------------------
1133 procedure Generate_Parent_References
is
1134 Decl
: constant Node_Id
:= Parent
(N
);
1137 if Id
= Cunit_Entity
(Main_Unit
)
1138 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
1140 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1142 elsif not Nkind_In
(Unit
(Cunit
(Main_Unit
)), N_Subprogram_Body
,
1145 -- If current unit is an ancestor of main unit, generate a
1146 -- reference to its own parent.
1150 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
1153 if Nkind
(Main_Spec
) = N_Package_Body
then
1154 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
1157 U
:= Parent_Spec
(Main_Spec
);
1158 while Present
(U
) loop
1159 if U
= Parent
(Decl
) then
1160 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
1163 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
1167 U
:= Parent_Spec
(Unit
(U
));
1172 end Generate_Parent_References
;
1174 ---------------------
1175 -- Is_Public_Child --
1176 ---------------------
1178 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
1180 if not Is_Private_Descendant
(Child
) then
1183 if Child
= Unit
then
1184 return not Private_Present
(
1185 Parent
(Unit_Declaration_Node
(Child
)));
1187 return Is_Public_Child
(Scope
(Child
), Unit
);
1190 end Is_Public_Child
;
1192 ----------------------------------------
1193 -- Inspect_Unchecked_Union_Completion --
1194 ----------------------------------------
1196 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
1200 Decl
:= First
(Decls
);
1201 while Present
(Decl
) loop
1203 -- We are looking at an incomplete or private type declaration
1204 -- with a known_discriminant_part whose full view is an
1207 if Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
1208 N_Private_Type_Declaration
)
1209 and then Has_Discriminants
(Defining_Identifier
(Decl
))
1210 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
1212 Is_Unchecked_Union
(Full_View
(Defining_Identifier
(Decl
)))
1215 ("completion of discriminated partial view "
1216 & "cannot be an unchecked union",
1217 Full_View
(Defining_Identifier
(Decl
)));
1222 end Inspect_Unchecked_Union_Completion
;
1224 -----------------------------------------
1225 -- Install_Parent_Private_Declarations --
1226 -----------------------------------------
1228 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
1229 Inst_Par
: Entity_Id
;
1230 Gen_Par
: Entity_Id
;
1231 Inst_Node
: Node_Id
;
1234 Inst_Par
:= Inst_Id
;
1237 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
1238 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
1239 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
1241 if Nkind_In
(Inst_Node
, N_Package_Instantiation
,
1242 N_Formal_Package_Declaration
)
1243 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
1245 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
1247 if Present
(Renamed_Entity
(Inst_Par
)) then
1248 Inst_Par
:= Renamed_Entity
(Inst_Par
);
1253 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
1255 -- Install the private declarations and private use clauses
1256 -- of a parent instance of the child instance, unless the
1257 -- parent instance private declarations have already been
1258 -- installed earlier in Analyze_Package_Specification, which
1259 -- happens when a generic child is instantiated, and the
1260 -- instance is a child of the parent instance.
1262 -- Installing the use clauses of the parent instance twice
1263 -- is both unnecessary and wrong, because it would cause the
1264 -- clauses to be chained to themselves in the use clauses
1265 -- list of the scope stack entry. That in turn would cause
1266 -- an endless loop from End_Use_Clauses upon scope exit.
1268 -- The parent is now fully visible. It may be a hidden open
1269 -- scope if we are currently compiling some child instance
1270 -- declared within it, but while the current instance is being
1271 -- compiled the parent is immediately visible. In particular
1272 -- its entities must remain visible if a stack save/restore
1273 -- takes place through a call to Rtsfind.
1275 if Present
(Gen_Par
) then
1276 if not In_Private_Part
(Inst_Par
) then
1277 Install_Private_Declarations
(Inst_Par
);
1278 Set_Use
(Private_Declarations
1280 (Unit_Declaration_Node
(Inst_Par
))));
1281 Set_Is_Hidden_Open_Scope
(Inst_Par
, False);
1284 -- If we've reached the end of the generic instance parents,
1285 -- then finish off by looping through the nongeneric parents
1286 -- and installing their private declarations.
1288 -- If one of the non-generic parents is itself on the scope
1289 -- stack, do not install its private declarations: they are
1290 -- installed in due time when the private part of that parent
1291 -- is analyzed. This is delicate ???
1294 while Present
(Inst_Par
)
1295 and then Inst_Par
/= Standard_Standard
1296 and then (not In_Open_Scopes
(Inst_Par
)
1297 or else not In_Private_Part
(Inst_Par
))
1299 Install_Private_Declarations
(Inst_Par
);
1300 Set_Use
(Private_Declarations
1302 (Unit_Declaration_Node
(Inst_Par
))));
1303 Inst_Par
:= Scope
(Inst_Par
);
1313 end Install_Parent_Private_Declarations
;
1315 -- Start of processing for Analyze_Package_Specification
1318 if Present
(Vis_Decls
) then
1319 Analyze_Declarations
(Vis_Decls
);
1322 -- Verify that incomplete types have received full declarations and
1323 -- also build invariant procedures for any types with invariants.
1325 E
:= First_Entity
(Id
);
1326 while Present
(E
) loop
1328 -- Check on incomplete types
1330 -- AI05-0213: A formal incomplete type has no completion
1332 if Ekind
(E
) = E_Incomplete_Type
1333 and then No
(Full_View
(E
))
1334 and then not Is_Generic_Type
(E
)
1336 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
1339 -- Build invariant procedures
1341 if Is_Type
(E
) and then Has_Invariants
(E
) then
1342 Build_Invariant_Procedure
(E
, N
);
1348 if Is_Remote_Call_Interface
(Id
)
1349 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
1351 Validate_RCI_Declarations
(Id
);
1354 -- Save global references in the visible declarations, before installing
1355 -- private declarations of parent unit if there is one, because the
1356 -- privacy status of types defined in the parent will change. This is
1357 -- only relevant for generic child units, but is done in all cases for
1360 if Ekind
(Id
) = E_Generic_Package
1361 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1364 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1365 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1367 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1368 Save_Global_References
(Orig_Decl
);
1369 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1373 -- If package is a public child unit, then make the private declarations
1374 -- of the parent visible.
1376 Public_Child
:= False;
1380 Pack_Decl
: Node_Id
;
1385 Par_Spec
:= Parent_Spec
(Parent
(N
));
1387 -- If the package is formal package of an enclosing generic, it is
1388 -- transformed into a local generic declaration, and compiled to make
1389 -- its spec available. We need to retrieve the original generic to
1390 -- determine whether it is a child unit, and install its parents.
1394 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1396 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1397 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1400 if Present
(Par_Spec
) then
1401 Generate_Parent_References
;
1403 while Scope
(Par
) /= Standard_Standard
1404 and then Is_Public_Child
(Id
, Par
)
1405 and then In_Open_Scopes
(Par
)
1407 Public_Child
:= True;
1409 Install_Private_Declarations
(Par
);
1410 Install_Private_With_Clauses
(Par
);
1411 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1412 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1417 if Is_Compilation_Unit
(Id
) then
1418 Install_Private_With_Clauses
(Id
);
1421 -- The current compilation unit may include private with_clauses,
1422 -- which are visible in the private part of the current nested
1423 -- package, and have to be installed now. This is not done for
1424 -- nested instantiations, where the private with_clauses of the
1425 -- enclosing unit have no effect once the instantiation info is
1426 -- established and we start analyzing the package declaration.
1429 Comp_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
1431 if Is_Package_Or_Generic_Package
(Comp_Unit
)
1432 and then not In_Private_Part
(Comp_Unit
)
1433 and then not In_Instance
1435 Install_Private_With_Clauses
(Comp_Unit
);
1436 Private_With_Clauses_Installed
:= True;
1441 -- If this is a package associated with a generic instance or formal
1442 -- package, then the private declarations of each of the generic's
1443 -- parents must be installed at this point.
1445 if Is_Generic_Instance
(Id
) then
1446 Install_Parent_Private_Declarations
(Id
);
1449 -- Analyze private part if present. The flag In_Private_Part is reset
1450 -- in End_Package_Scope.
1452 L
:= Last_Entity
(Id
);
1454 if Present
(Priv_Decls
) then
1455 Set_In_Private_Part
(Id
);
1457 -- Upon entering a public child's private part, it may be necessary
1458 -- to declare subprograms that were derived in the package's visible
1459 -- part but not yet made visible.
1461 if Public_Child
then
1462 Declare_Inherited_Private_Subprograms
(Id
);
1465 Analyze_Declarations
(Priv_Decls
);
1467 -- Check the private declarations for incomplete deferred constants
1469 Inspect_Deferred_Constant_Completion
(Priv_Decls
);
1471 -- The first private entity is the immediate follower of the last
1472 -- visible entity, if there was one.
1475 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1477 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
1480 -- There may be inherited private subprograms that need to be declared,
1481 -- even in the absence of an explicit private part. If there are any
1482 -- public declarations in the package and the package is a public child
1483 -- unit, then an implicit private part is assumed.
1485 elsif Present
(L
) and then Public_Child
then
1486 Set_In_Private_Part
(Id
);
1487 Declare_Inherited_Private_Subprograms
(Id
);
1488 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1491 E
:= First_Entity
(Id
);
1492 while Present
(E
) loop
1494 -- Check rule of 3.6(11), which in general requires waiting till all
1495 -- full types have been seen.
1497 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1498 Check_Aliased_Component_Types
(E
);
1501 -- Check preelaborable initialization for full type completing a
1502 -- private type for which pragma Preelaborable_Initialization given.
1505 and then Must_Have_Preelab_Init
(E
)
1506 and then not Has_Preelaborable_Initialization
(E
)
1509 ("full view of & does not have preelaborable initialization", E
);
1512 -- An invariant may appear on a full view of a type
1515 and then Has_Private_Declaration
(E
)
1516 and then Nkind
(Parent
(E
)) = N_Full_Type_Declaration
1517 and then Has_Aspects
(Parent
(E
))
1523 ASN
:= First
(Aspect_Specifications
(Parent
(E
)));
1524 while Present
(ASN
) loop
1525 if Nam_In
(Chars
(Identifier
(ASN
)), Name_Invariant
,
1526 Name_Type_Invariant
)
1528 Build_Invariant_Procedure
(E
, N
);
1540 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1541 -- declaration having a known_discriminant_part shall not be an
1542 -- unchecked union type.
1544 if Present
(Vis_Decls
) then
1545 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1548 if Present
(Priv_Decls
) then
1549 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1552 if Ekind
(Id
) = E_Generic_Package
1553 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1554 and then Present
(Priv_Decls
)
1556 -- Save global references in private declarations, ignoring the
1557 -- visible declarations that were processed earlier.
1560 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1561 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1562 Save_Form
: constant List_Id
:=
1563 Generic_Formal_Declarations
(Orig_Decl
);
1566 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1567 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1568 Save_Global_References
(Orig_Decl
);
1569 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1570 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1574 Process_End_Label
(N
, 'e', Id
);
1576 -- Remove private_with_clauses of enclosing compilation unit, if they
1579 if Private_With_Clauses_Installed
then
1580 Remove_Private_With_Clauses
(Cunit
(Current_Sem_Unit
));
1583 -- For the case of a library level package, we must go through all the
1584 -- entities clearing the indications that the value may be constant and
1585 -- not modified. Why? Because any client of this package may modify
1586 -- these values freely from anywhere. This also applies to any nested
1587 -- packages or generic packages.
1589 -- For now we unconditionally clear constants for packages that are
1590 -- instances of generic packages. The reason is that we do not have the
1591 -- body yet, and we otherwise think things are unreferenced when they
1592 -- are not. This should be fixed sometime (the effect is not terrible,
1593 -- we just lose some warnings, and also some cases of value propagation)
1596 if Is_Library_Level_Entity
(Id
)
1597 or else Is_Generic_Instance
(Id
)
1599 Clear_Constants
(Id
, First_Entity
(Id
));
1600 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1603 -- Issue an error in SPARK mode if a package specification contains
1604 -- more than one tagged type or type extension.
1606 Check_One_Tagged_Type_Or_Extension_At_Most
;
1608 -- If switch set, output information on why body required
1610 if List_Body_Required_Info
1611 and then In_Extended_Main_Source_Unit
(Id
)
1612 and then Unit_Requires_Body
(Id
)
1614 Unit_Requires_Body_Info
(Id
);
1616 end Analyze_Package_Specification
;
1618 --------------------------------------
1619 -- Analyze_Private_Type_Declaration --
1620 --------------------------------------
1622 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1623 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1624 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1627 Generate_Definition
(Id
);
1628 Set_Is_Pure
(Id
, PF
);
1629 Init_Size_Align
(Id
);
1631 if not Is_Package_Or_Generic_Package
(Current_Scope
)
1632 or else In_Private_Part
(Current_Scope
)
1634 Error_Msg_N
("invalid context for private declaration", N
);
1637 New_Private_Type
(N
, Id
, N
);
1638 Set_Depends_On_Private
(Id
);
1640 if Has_Aspects
(N
) then
1641 Analyze_Aspect_Specifications
(N
, Id
);
1643 end Analyze_Private_Type_Declaration
;
1645 ----------------------------------
1646 -- Check_Anonymous_Access_Types --
1647 ----------------------------------
1649 procedure Check_Anonymous_Access_Types
1650 (Spec_Id
: Entity_Id
;
1657 -- Itype references are only needed by gigi, to force elaboration of
1658 -- itypes. In the absence of code generation, they are not needed.
1660 if not Expander_Active
then
1664 E
:= First_Entity
(Spec_Id
);
1665 while Present
(E
) loop
1666 if Ekind
(E
) = E_Anonymous_Access_Type
1667 and then From_Limited_With
(E
)
1669 IR
:= Make_Itype_Reference
(Sloc
(P_Body
));
1672 if No
(Declarations
(P_Body
)) then
1673 Set_Declarations
(P_Body
, New_List
(IR
));
1675 Prepend
(IR
, Declarations
(P_Body
));
1681 end Check_Anonymous_Access_Types
;
1683 -------------------------------------------
1684 -- Declare_Inherited_Private_Subprograms --
1685 -------------------------------------------
1687 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1689 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1690 -- Check whether an inherited subprogram S is an operation of an
1691 -- untagged derived type T.
1693 ---------------------
1694 -- Is_Primitive_Of --
1695 ---------------------
1697 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1701 -- If the full view is a scalar type, the type is the anonymous base
1702 -- type, but the operation mentions the first subtype, so check the
1703 -- signature against the base type.
1705 if Base_Type
(Etype
(S
)) = Base_Type
(T
) then
1709 Formal
:= First_Formal
(S
);
1710 while Present
(Formal
) loop
1711 if Base_Type
(Etype
(Formal
)) = Base_Type
(T
) then
1715 Next_Formal
(Formal
);
1720 end Is_Primitive_Of
;
1727 Op_Elmt_2
: Elmt_Id
;
1728 Prim_Op
: Entity_Id
;
1729 New_Op
: Entity_Id
:= Empty
;
1730 Parent_Subp
: Entity_Id
;
1733 -- Start of processing for Declare_Inherited_Private_Subprograms
1736 E
:= First_Entity
(Id
);
1737 while Present
(E
) loop
1739 -- If the entity is a nonprivate type extension whose parent type
1740 -- is declared in an open scope, then the type may have inherited
1741 -- operations that now need to be made visible. Ditto if the entity
1742 -- is a formal derived type in a child unit.
1744 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1746 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1747 and then Is_Generic_Type
(E
)))
1748 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1749 and then Is_Base_Type
(E
)
1751 if Is_Tagged_Type
(E
) then
1752 Op_List
:= Primitive_Operations
(E
);
1754 Tag
:= First_Tag_Component
(E
);
1756 Op_Elmt
:= First_Elmt
(Op_List
);
1757 while Present
(Op_Elmt
) loop
1758 Prim_Op
:= Node
(Op_Elmt
);
1760 -- Search primitives that are implicit operations with an
1761 -- internal name whose parent operation has a normal name.
1763 if Present
(Alias
(Prim_Op
))
1764 and then Find_Dispatching_Type
(Alias
(Prim_Op
)) /= E
1765 and then not Comes_From_Source
(Prim_Op
)
1766 and then Is_Internal_Name
(Chars
(Prim_Op
))
1767 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1769 Parent_Subp
:= Alias
(Prim_Op
);
1771 -- Case 1: Check if the type has also an explicit
1772 -- overriding for this primitive.
1774 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1775 while Present
(Op_Elmt_2
) loop
1777 -- Skip entities with attribute Interface_Alias since
1778 -- they are not overriding primitives (these entities
1779 -- link an interface primitive with their covering
1782 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
1783 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
1784 and then No
(Interface_Alias
(Node
(Op_Elmt_2
)))
1786 -- The private inherited operation has been
1787 -- overridden by an explicit subprogram:
1788 -- replace the former by the latter.
1790 New_Op
:= Node
(Op_Elmt_2
);
1791 Replace_Elmt
(Op_Elmt
, New_Op
);
1792 Remove_Elmt
(Op_List
, Op_Elmt_2
);
1793 Set_Overridden_Operation
(New_Op
, Parent_Subp
);
1795 -- We don't need to inherit its dispatching slot.
1796 -- Set_All_DT_Position has previously ensured that
1797 -- the same slot was assigned to the two primitives
1800 and then Present
(DTC_Entity
(New_Op
))
1801 and then Present
(DTC_Entity
(Prim_Op
))
1804 (DT_Position
(New_Op
) = DT_Position
(Prim_Op
));
1808 goto Next_Primitive
;
1811 Next_Elmt
(Op_Elmt_2
);
1814 -- Case 2: We have not found any explicit overriding and
1815 -- hence we need to declare the operation (i.e., make it
1818 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1820 -- Inherit the dispatching slot if E is already frozen
1823 and then Present
(DTC_Entity
(Alias
(Prim_Op
)))
1825 Set_DTC_Entity_Value
(E
, New_Op
);
1826 Set_DT_Position
(New_Op
,
1827 DT_Position
(Alias
(Prim_Op
)));
1831 (Is_Dispatching_Operation
(New_Op
)
1832 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
1834 -- Substitute the new operation for the old one in the
1835 -- type's primitive operations list. Since the new
1836 -- operation was also just added to the end of list,
1837 -- the last element must be removed.
1839 -- (Question: is there a simpler way of declaring the
1840 -- operation, say by just replacing the name of the
1841 -- earlier operation, reentering it in the in the symbol
1842 -- table (how?), and marking it as private???)
1844 Replace_Elmt
(Op_Elmt
, New_Op
);
1845 Remove_Last_Elmt
(Op_List
);
1849 Next_Elmt
(Op_Elmt
);
1852 -- Generate listing showing the contents of the dispatch table
1854 if Debug_Flag_ZZ
then
1859 -- Non-tagged type, scan forward to locate inherited hidden
1862 Prim_Op
:= Next_Entity
(E
);
1863 while Present
(Prim_Op
) loop
1864 if Is_Subprogram
(Prim_Op
)
1865 and then Present
(Alias
(Prim_Op
))
1866 and then not Comes_From_Source
(Prim_Op
)
1867 and then Is_Internal_Name
(Chars
(Prim_Op
))
1868 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1869 and then Is_Primitive_Of
(E
, Prim_Op
)
1871 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1874 Next_Entity
(Prim_Op
);
1876 -- Derived operations appear immediately after the type
1877 -- declaration (or the following subtype indication for
1878 -- a derived scalar type). Further declarations cannot
1879 -- include inherited operations of the type.
1881 if Present
(Prim_Op
) then
1882 exit when Ekind
(Prim_Op
) not in Overloadable_Kind
;
1890 end Declare_Inherited_Private_Subprograms
;
1892 -----------------------
1893 -- End_Package_Scope --
1894 -----------------------
1896 procedure End_Package_Scope
(P
: Entity_Id
) is
1898 Uninstall_Declarations
(P
);
1900 end End_Package_Scope
;
1902 ---------------------------
1903 -- Exchange_Declarations --
1904 ---------------------------
1906 procedure Exchange_Declarations
(Id
: Entity_Id
) is
1907 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
1908 H1
: constant Entity_Id
:= Homonym
(Id
);
1909 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
1914 -- If missing full declaration for type, nothing to exchange
1916 if No
(Full_Id
) then
1920 -- Otherwise complete the exchange, and preserve semantic links
1922 Next2
:= Next_Entity
(Full_Id
);
1923 H2
:= Homonym
(Full_Id
);
1925 -- Reset full declaration pointer to reflect the switched entities and
1926 -- readjust the next entity chains.
1928 Exchange_Entities
(Id
, Full_Id
);
1930 Set_Next_Entity
(Id
, Next1
);
1931 Set_Homonym
(Id
, H1
);
1933 Set_Full_View
(Full_Id
, Id
);
1934 Set_Next_Entity
(Full_Id
, Next2
);
1935 Set_Homonym
(Full_Id
, H2
);
1936 end Exchange_Declarations
;
1938 ----------------------------
1939 -- Install_Package_Entity --
1940 ----------------------------
1942 procedure Install_Package_Entity
(Id
: Entity_Id
) is
1944 if not Is_Internal
(Id
) then
1945 if Debug_Flag_E
then
1946 Write_Str
("Install: ");
1947 Write_Name
(Chars
(Id
));
1951 if not Is_Child_Unit
(Id
) then
1952 Set_Is_Immediately_Visible
(Id
);
1956 end Install_Package_Entity
;
1958 ----------------------------------
1959 -- Install_Private_Declarations --
1960 ----------------------------------
1962 procedure Install_Private_Declarations
(P
: Entity_Id
) is
1965 Priv_Deps
: Elist_Id
;
1967 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
);
1968 -- When the full view of a private type is made available, we do the
1969 -- same for its private dependents under proper visibility conditions.
1970 -- When compiling a grand-chid unit this needs to be done recursively.
1972 -----------------------------
1973 -- Swap_Private_Dependents --
1974 -----------------------------
1976 procedure Swap_Private_Dependents
(Priv_Deps
: Elist_Id
) is
1979 Priv_Elmt
: Elmt_Id
;
1983 Priv_Elmt
:= First_Elmt
(Priv_Deps
);
1984 while Present
(Priv_Elmt
) loop
1985 Priv
:= Node
(Priv_Elmt
);
1987 -- Before the exchange, verify that the presence of the Full_View
1988 -- field. This field will be empty if the entity has already been
1989 -- installed due to a previous call.
1991 if Present
(Full_View
(Priv
))
1992 and then Is_Visible_Dependent
(Priv
)
1994 if Is_Private_Type
(Priv
) then
1995 Deps
:= Private_Dependents
(Priv
);
2001 -- For each subtype that is swapped, we also swap the reference
2002 -- to it in Private_Dependents, to allow access to it when we
2003 -- swap them out in End_Package_Scope.
2005 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
2006 Exchange_Declarations
(Priv
);
2007 Set_Is_Immediately_Visible
2008 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
2009 Set_Is_Potentially_Use_Visible
2010 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
2012 -- Within a child unit, recurse, except in generic child unit,
2013 -- which (unfortunately) handle private_dependents separately.
2016 and then Is_Child_Unit
(Cunit_Entity
(Current_Sem_Unit
))
2017 and then not Is_Empty_Elmt_List
(Deps
)
2018 and then not Inside_A_Generic
2020 Swap_Private_Dependents
(Deps
);
2024 Next_Elmt
(Priv_Elmt
);
2026 end Swap_Private_Dependents
;
2028 -- Start of processing for Install_Private_Declarations
2031 -- First exchange declarations for private types, so that the full
2032 -- declaration is visible. For each private type, we check its
2033 -- Private_Dependents list and also exchange any subtypes of or derived
2034 -- types from it. Finally, if this is a Taft amendment type, the
2035 -- incomplete declaration is irrelevant, and we want to link the
2036 -- eventual full declaration with the original private one so we
2037 -- also skip the exchange.
2039 Id
:= First_Entity
(P
);
2040 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2041 if Is_Private_Base_Type
(Id
)
2042 and then Comes_From_Source
(Full_View
(Id
))
2043 and then Present
(Full_View
(Id
))
2044 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
2045 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
2047 -- If there is a use-type clause on the private type, set the full
2048 -- view accordingly.
2050 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
2051 Full
:= Full_View
(Id
);
2053 if Is_Private_Base_Type
(Full
)
2054 and then Has_Private_Declaration
(Full
)
2055 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
2056 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
2057 and then In_Package_Body
(Current_Scope
)
2058 and then not Is_Private_Type
(Etype
(Full
))
2060 -- This is the completion of a private type by a derivation
2061 -- from another private type which is not private anymore. This
2062 -- can only happen in a package nested within a child package,
2063 -- when the parent type is defined in the parent unit. At this
2064 -- point the current type is not private either, and we have
2065 -- to install the underlying full view, which is now visible.
2066 -- Save the current full view as well, so that all views can be
2067 -- restored on exit. It may seem that after compiling the child
2068 -- body there are not environments to restore, but the back-end
2069 -- expects those links to be valid, and freeze nodes depend on
2072 if No
(Full_View
(Full
))
2073 and then Present
(Underlying_Full_View
(Full
))
2075 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
2076 Set_Underlying_Full_View
(Id
, Full
);
2078 Set_Underlying_Full_View
(Full
, Empty
);
2079 Set_Is_Frozen
(Full_View
(Id
));
2083 Priv_Deps
:= Private_Dependents
(Id
);
2084 Exchange_Declarations
(Id
);
2085 Set_Is_Immediately_Visible
(Id
);
2086 Swap_Private_Dependents
(Priv_Deps
);
2092 -- Next make other declarations in the private part visible as well
2094 Id
:= First_Private_Entity
(P
);
2095 while Present
(Id
) loop
2096 Install_Package_Entity
(Id
);
2097 Set_Is_Hidden
(Id
, False);
2101 -- Indicate that the private part is currently visible, so it can be
2102 -- properly reset on exit.
2104 Set_In_Private_Part
(P
);
2105 end Install_Private_Declarations
;
2107 ----------------------------------
2108 -- Install_Visible_Declarations --
2109 ----------------------------------
2111 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
2113 Last_Entity
: Entity_Id
;
2117 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
2119 if Is_Package_Or_Generic_Package
(P
) then
2120 Last_Entity
:= First_Private_Entity
(P
);
2122 Last_Entity
:= Empty
;
2125 Id
:= First_Entity
(P
);
2126 while Present
(Id
) and then Id
/= Last_Entity
loop
2127 Install_Package_Entity
(Id
);
2130 end Install_Visible_Declarations
;
2132 --------------------------
2133 -- Is_Private_Base_Type --
2134 --------------------------
2136 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
2138 return Ekind
(E
) = E_Private_Type
2139 or else Ekind
(E
) = E_Limited_Private_Type
2140 or else Ekind
(E
) = E_Record_Type_With_Private
;
2141 end Is_Private_Base_Type
;
2143 --------------------------
2144 -- Is_Visible_Dependent --
2145 --------------------------
2147 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
2149 S
: constant Entity_Id
:= Scope
(Dep
);
2152 -- Renamings created for actual types have the visibility of the actual
2154 if Ekind
(S
) = E_Package
2155 and then Is_Generic_Instance
(S
)
2156 and then (Is_Generic_Actual_Type
(Dep
)
2157 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
2161 elsif not (Is_Derived_Type
(Dep
))
2162 and then Is_Derived_Type
(Full_View
(Dep
))
2164 -- When instantiating a package body, the scope stack is empty, so
2165 -- check instead whether the dependent type is defined in the same
2166 -- scope as the instance itself.
2168 return In_Open_Scopes
(S
)
2169 or else (Is_Generic_Instance
(Current_Scope
)
2170 and then Scope
(Dep
) = Scope
(Current_Scope
));
2174 end Is_Visible_Dependent
;
2176 ----------------------------
2177 -- May_Need_Implicit_Body --
2178 ----------------------------
2180 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
2181 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
2182 S
: constant Node_Id
:= Parent
(P
);
2187 if not Has_Completion
(E
)
2188 and then Nkind
(P
) = N_Package_Declaration
2189 and then (Present
(Activation_Chain_Entity
(P
)) or else Has_RACW
(E
))
2192 Make_Package_Body
(Sloc
(E
),
2193 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
2194 Chars
=> Chars
(E
)),
2195 Declarations
=> New_List
);
2197 if Nkind
(S
) = N_Package_Specification
then
2198 if Present
(Private_Declarations
(S
)) then
2199 Decls
:= Private_Declarations
(S
);
2201 Decls
:= Visible_Declarations
(S
);
2204 Decls
:= Declarations
(S
);
2210 end May_Need_Implicit_Body
;
2212 ----------------------
2213 -- New_Private_Type --
2214 ----------------------
2216 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
2218 -- For other than Ada 2012, enter the name in the current scope
2220 if Ada_Version
< Ada_2012
then
2223 -- Ada 2012 (AI05-0162): Enter the name in the current scope. Note that
2224 -- there may be an incomplete previous view.
2230 Prev
:= Find_Type_Name
(N
);
2231 pragma Assert
(Prev
= Id
2232 or else (Ekind
(Prev
) = E_Incomplete_Type
2233 and then Present
(Full_View
(Prev
))
2234 and then Full_View
(Prev
) = Id
));
2238 if Limited_Present
(Def
) then
2239 Set_Ekind
(Id
, E_Limited_Private_Type
);
2241 Set_Ekind
(Id
, E_Private_Type
);
2245 Set_Has_Delayed_Freeze
(Id
);
2246 Set_Is_First_Subtype
(Id
);
2247 Init_Size_Align
(Id
);
2249 Set_Is_Constrained
(Id
,
2250 No
(Discriminant_Specifications
(N
))
2251 and then not Unknown_Discriminants_Present
(N
));
2253 -- Set tagged flag before processing discriminants, to catch illegal
2256 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
2258 Set_Discriminant_Constraint
(Id
, No_Elist
);
2259 Set_Stored_Constraint
(Id
, No_Elist
);
2261 if Present
(Discriminant_Specifications
(N
)) then
2263 Process_Discriminants
(N
);
2266 elsif Unknown_Discriminants_Present
(N
) then
2267 Set_Has_Unknown_Discriminants
(Id
);
2270 Set_Private_Dependents
(Id
, New_Elmt_List
);
2272 if Tagged_Present
(Def
) then
2273 Set_Ekind
(Id
, E_Record_Type_With_Private
);
2274 Set_Direct_Primitive_Operations
(Id
, New_Elmt_List
);
2275 Set_Is_Abstract_Type
(Id
, Abstract_Present
(Def
));
2276 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
2277 Set_Has_Delayed_Freeze
(Id
, True);
2279 -- Create a class-wide type with the same attributes
2281 Make_Class_Wide_Type
(Id
);
2283 elsif Abstract_Present
(Def
) then
2284 Error_Msg_N
("only a tagged type can be abstract", N
);
2286 end New_Private_Type
;
2288 ----------------------------
2289 -- Uninstall_Declarations --
2290 ----------------------------
2292 procedure Uninstall_Declarations
(P
: Entity_Id
) is
2293 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
2296 Priv_Elmt
: Elmt_Id
;
2297 Priv_Sub
: Entity_Id
;
2299 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
2300 -- Copy to the private declaration the attributes of the full view that
2301 -- need to be available for the partial view also.
2303 function Type_In_Use
(T
: Entity_Id
) return Boolean;
2304 -- Check whether type or base type appear in an active use_type clause
2306 ------------------------------
2307 -- Preserve_Full_Attributes --
2308 ------------------------------
2310 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
2311 Priv_Is_Base_Type
: constant Boolean := Is_Base_Type
(Priv
);
2314 Set_Size_Info
(Priv
, (Full
));
2315 Set_RM_Size
(Priv
, RM_Size
(Full
));
2316 Set_Size_Known_At_Compile_Time
2317 (Priv
, Size_Known_At_Compile_Time
(Full
));
2318 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
2319 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
2320 Set_Is_Ada_2005_Only
(Priv
, Is_Ada_2005_Only
(Full
));
2321 Set_Is_Ada_2012_Only
(Priv
, Is_Ada_2012_Only
(Full
));
2322 Set_Has_Pragma_Unmodified
(Priv
, Has_Pragma_Unmodified
(Full
));
2323 Set_Has_Pragma_Unreferenced
(Priv
, Has_Pragma_Unreferenced
(Full
));
2324 Set_Has_Pragma_Unreferenced_Objects
2325 (Priv
, Has_Pragma_Unreferenced_Objects
2327 if Is_Unchecked_Union
(Full
) then
2328 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
2330 -- Why is atomic not copied here ???
2332 if Referenced
(Full
) then
2333 Set_Referenced
(Priv
);
2336 if Priv_Is_Base_Type
then
2337 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
2338 Set_Finalize_Storage_Only
(Priv
, Finalize_Storage_Only
2339 (Base_Type
(Full
)));
2340 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
2341 Set_Has_Controlled_Component
(Priv
, Has_Controlled_Component
2342 (Base_Type
(Full
)));
2345 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
2347 -- Propagate information of type invariants, which may be specified
2348 -- for the full view.
2350 if Has_Invariants
(Full
) and not Has_Invariants
(Priv
) then
2351 Set_Has_Invariants
(Priv
);
2352 Set_Subprograms_For_Type
(Priv
, Subprograms_For_Type
(Full
));
2355 if Is_Tagged_Type
(Priv
)
2356 and then Is_Tagged_Type
(Full
)
2357 and then not Error_Posted
(Full
)
2359 if Is_Tagged_Type
(Priv
) then
2361 -- If the type is tagged, the tag itself must be available on
2362 -- the partial view, for expansion purposes.
2364 Set_First_Entity
(Priv
, First_Entity
(Full
));
2366 -- If there are discriminants in the partial view, these remain
2367 -- visible. Otherwise only the tag itself is visible, and there
2368 -- are no nameable components in the partial view.
2370 if No
(Last_Entity
(Priv
)) then
2371 Set_Last_Entity
(Priv
, First_Entity
(Priv
));
2375 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
2377 if Has_Discriminants
(Full
) then
2378 Set_Discriminant_Constraint
(Priv
,
2379 Discriminant_Constraint
(Full
));
2382 end Preserve_Full_Attributes
;
2388 function Type_In_Use
(T
: Entity_Id
) return Boolean is
2390 return Scope
(Base_Type
(T
)) = P
2391 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
2394 -- Start of processing for Uninstall_Declarations
2397 Id
:= First_Entity
(P
);
2398 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2399 if Debug_Flag_E
then
2400 Write_Str
("unlinking visible entity ");
2401 Write_Int
(Int
(Id
));
2405 -- On exit from the package scope, we must preserve the visibility
2406 -- established by use clauses in the current scope. Two cases:
2408 -- a) If the entity is an operator, it may be a primitive operator of
2409 -- a type for which there is a visible use-type clause.
2411 -- b) for other entities, their use-visibility is determined by a
2412 -- visible use clause for the package itself. For a generic instance,
2413 -- the instantiation of the formals appears in the visible part,
2414 -- but the formals are private and remain so.
2416 if Ekind
(Id
) = E_Function
2417 and then Is_Operator_Symbol_Name
(Chars
(Id
))
2418 and then not Is_Hidden
(Id
)
2419 and then not Error_Posted
(Id
)
2421 Set_Is_Potentially_Use_Visible
(Id
,
2423 or else Type_In_Use
(Etype
(Id
))
2424 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
2425 or else (Present
(Next_Formal
(First_Formal
(Id
)))
2428 (Etype
(Next_Formal
(First_Formal
(Id
))))));
2430 if In_Use
(P
) and then not Is_Hidden
(Id
) then
2432 -- A child unit of a use-visible package remains use-visible
2433 -- only if it is itself a visible child unit. Otherwise it
2434 -- would remain visible in other contexts where P is use-
2435 -- visible, because once compiled it stays in the entity list
2436 -- of its parent unit.
2438 if Is_Child_Unit
(Id
) then
2439 Set_Is_Potentially_Use_Visible
2440 (Id
, Is_Visible_Lib_Unit
(Id
));
2442 Set_Is_Potentially_Use_Visible
(Id
);
2446 Set_Is_Potentially_Use_Visible
(Id
, False);
2450 -- Local entities are not immediately visible outside of the package
2452 Set_Is_Immediately_Visible
(Id
, False);
2454 -- If this is a private type with a full view (for example a local
2455 -- subtype of a private type declared elsewhere), ensure that the
2456 -- full view is also removed from visibility: it may be exposed when
2457 -- swapping views in an instantiation.
2459 if Is_Type
(Id
) and then Present
(Full_View
(Id
)) then
2460 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
2463 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2464 Check_Abstract_Overriding
(Id
);
2465 Check_Conventions
(Id
);
2468 if Ekind_In
(Id
, E_Private_Type
, E_Limited_Private_Type
)
2469 and then No
(Full_View
(Id
))
2470 and then not Is_Generic_Type
(Id
)
2471 and then not Is_Derived_Type
(Id
)
2473 Error_Msg_N
("missing full declaration for private type&", Id
);
2475 elsif Ekind
(Id
) = E_Record_Type_With_Private
2476 and then not Is_Generic_Type
(Id
)
2477 and then No
(Full_View
(Id
))
2479 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
2480 Error_Msg_N
("missing full declaration for private type&", Id
);
2483 ("missing full declaration for private extension", Id
);
2486 -- Case of constant, check for deferred constant declaration with
2487 -- no full view. Likely just a matter of a missing expression, or
2488 -- accidental use of the keyword constant.
2490 elsif Ekind
(Id
) = E_Constant
2492 -- OK if constant value present
2494 and then No
(Constant_Value
(Id
))
2496 -- OK if full view present
2498 and then No
(Full_View
(Id
))
2500 -- OK if imported, since that provides the completion
2502 and then not Is_Imported
(Id
)
2504 -- OK if object declaration replaced by renaming declaration as
2505 -- a result of OK_To_Rename processing (e.g. for concatenation)
2507 and then Nkind
(Parent
(Id
)) /= N_Object_Renaming_Declaration
2509 -- OK if object declaration with the No_Initialization flag set
2511 and then not (Nkind
(Parent
(Id
)) = N_Object_Declaration
2512 and then No_Initialization
(Parent
(Id
)))
2514 -- If no private declaration is present, we assume the user did
2515 -- not intend a deferred constant declaration and the problem
2516 -- is simply that the initializing expression is missing.
2518 if not Has_Private_Declaration
(Etype
(Id
)) then
2520 -- We assume that the user did not intend a deferred constant
2521 -- declaration, and the expression is just missing.
2524 ("constant declaration requires initialization expression",
2527 if Is_Limited_Type
(Etype
(Id
)) then
2529 ("\if variable intended, remove CONSTANT from declaration",
2533 -- Otherwise if a private declaration is present, then we are
2534 -- missing the full declaration for the deferred constant.
2538 ("missing full declaration for deferred constant (RM 7.4)",
2541 if Is_Limited_Type
(Etype
(Id
)) then
2543 ("\if variable intended, remove CONSTANT from declaration",
2552 -- If the specification was installed as the parent of a public child
2553 -- unit, the private declarations were not installed, and there is
2556 if not In_Private_Part
(P
) then
2559 Set_In_Private_Part
(P
, False);
2562 -- Make private entities invisible and exchange full and private
2563 -- declarations for private types. Id is now the first private entity
2566 while Present
(Id
) loop
2567 if Debug_Flag_E
then
2568 Write_Str
("unlinking private entity ");
2569 Write_Int
(Int
(Id
));
2573 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2574 Check_Abstract_Overriding
(Id
);
2575 Check_Conventions
(Id
);
2578 Set_Is_Immediately_Visible
(Id
, False);
2580 if Is_Private_Base_Type
(Id
) and then Present
(Full_View
(Id
)) then
2581 Full
:= Full_View
(Id
);
2583 -- If the partial view is not declared in the visible part of the
2584 -- package (as is the case when it is a type derived from some
2585 -- other private type in the private part of the current package),
2586 -- no exchange takes place.
2589 or else List_Containing
(Parent
(Id
)) /=
2590 Visible_Declarations
(Specification
(Decl
))
2595 -- The entry in the private part points to the full declaration,
2596 -- which is currently visible. Exchange them so only the private
2597 -- type declaration remains accessible, and link private and full
2598 -- declaration in the opposite direction. Before the actual
2599 -- exchange, we copy back attributes of the full view that must
2600 -- be available to the partial view too.
2602 Preserve_Full_Attributes
(Id
, Full
);
2604 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
2606 if Is_Indefinite_Subtype
(Full
)
2607 and then not Is_Indefinite_Subtype
(Id
)
2610 ("full view of type must be definite subtype", Full
);
2613 -- Swap out the subtypes and derived types of Id that
2614 -- were compiled in this scope, or installed previously
2615 -- by Install_Private_Declarations.
2617 -- Before we do the swap, we verify the presence of the Full_View
2618 -- field which may be empty due to a swap by a previous call to
2619 -- End_Package_Scope (e.g. from the freezing mechanism).
2621 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2622 while Present
(Priv_Elmt
) loop
2623 Priv_Sub
:= Node
(Priv_Elmt
);
2625 if Present
(Full_View
(Priv_Sub
)) then
2626 if Scope
(Priv_Sub
) = P
2627 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
2629 Set_Is_Immediately_Visible
(Priv_Sub
, False);
2632 if Is_Visible_Dependent
(Priv_Sub
) then
2633 Preserve_Full_Attributes
2634 (Priv_Sub
, Full_View
(Priv_Sub
));
2635 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
2636 Exchange_Declarations
(Priv_Sub
);
2640 Next_Elmt
(Priv_Elmt
);
2643 -- Now restore the type itself to its private view
2645 Exchange_Declarations
(Id
);
2647 -- If we have installed an underlying full view for a type derived
2648 -- from a private type in a child unit, restore the proper views
2649 -- of private and full view. See corresponding code in
2650 -- Install_Private_Declarations.
2652 -- After the exchange, Full denotes the private type in the
2653 -- visible part of the package.
2655 if Is_Private_Base_Type
(Full
)
2656 and then Present
(Full_View
(Full
))
2657 and then Present
(Underlying_Full_View
(Full
))
2658 and then In_Package_Body
(Current_Scope
)
2660 Set_Full_View
(Full
, Underlying_Full_View
(Full
));
2661 Set_Underlying_Full_View
(Full
, Empty
);
2664 elsif Ekind
(Id
) = E_Incomplete_Type
2665 and then Comes_From_Source
(Id
)
2666 and then No
(Full_View
(Id
))
2668 -- Mark Taft amendment types. Verify that there are no primitive
2669 -- operations declared for the type (3.10.1(9)).
2671 Set_Has_Completion_In_Body
(Id
);
2678 Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2679 while Present
(Elmt
) loop
2680 Subp
:= Node
(Elmt
);
2682 -- Is_Primitive is tested because there can be cases where
2683 -- nonprimitive subprograms (in nested packages) are added
2684 -- to the Private_Dependents list.
2686 if Is_Overloadable
(Subp
) and then Is_Primitive
(Subp
) then
2688 ("type& must be completed in the private part",
2691 -- The result type of an access-to-function type cannot be a
2692 -- Taft-amendment type, unless the version is Ada 2012 or
2693 -- later (see AI05-151).
2695 elsif Ada_Version
< Ada_2012
2696 and then Ekind
(Subp
) = E_Subprogram_Type
2698 if Etype
(Subp
) = Id
2700 (Is_Class_Wide_Type
(Etype
(Subp
))
2701 and then Etype
(Etype
(Subp
)) = Id
)
2704 ("type& must be completed in the private part",
2705 Associated_Node_For_Itype
(Subp
), Id
);
2713 elsif not Is_Child_Unit
(Id
)
2714 and then (not Is_Private_Type
(Id
) or else No
(Full_View
(Id
)))
2717 Set_Is_Potentially_Use_Visible
(Id
, False);
2723 end Uninstall_Declarations
;
2725 ------------------------
2726 -- Unit_Requires_Body --
2727 ------------------------
2729 function Unit_Requires_Body
2731 Ignore_Abstract_State
: Boolean := False) return Boolean
2736 -- Imported entity never requires body. Right now, only subprograms can
2737 -- be imported, but perhaps in the future we will allow import of
2740 if Is_Imported
(P
) then
2743 -- Body required if library package with pragma Elaborate_Body
2745 elsif Has_Pragma_Elaborate_Body
(P
) then
2748 -- Body required if subprogram
2750 elsif Is_Subprogram
(P
) or else Is_Generic_Subprogram
(P
) then
2753 -- Treat a block as requiring a body
2755 elsif Ekind
(P
) = E_Block
then
2758 elsif Ekind
(P
) = E_Package
2759 and then Nkind
(Parent
(P
)) = N_Package_Specification
2760 and then Present
(Generic_Parent
(Parent
(P
)))
2763 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(P
));
2765 if Has_Pragma_Elaborate_Body
(G_P
) then
2770 -- A [generic] package that introduces at least one non-null abstract
2771 -- state requires completion. However, there is a separate rule that
2772 -- requires that such a package have a reason other than this for a
2773 -- body being required (if necessary a pragma Elaborate_Body must be
2774 -- provided). If Ignore_Abstract_State is True, we don't do this check
2775 -- (so we can use Unit_Requires_Body to check for some other reason).
2777 elsif Ekind_In
(P
, E_Generic_Package
, E_Package
)
2778 and then not Ignore_Abstract_State
2779 and then Present
(Abstract_States
(P
))
2781 not Is_Null_State
(Node
(First_Elmt
(Abstract_States
(P
))))
2786 -- Otherwise search entity chain for entity requiring completion
2788 E
:= First_Entity
(P
);
2789 while Present
(E
) loop
2791 -- Always ignore child units. Child units get added to the entity
2792 -- list of a parent unit, but are not original entities of the
2793 -- parent, and so do not affect whether the parent needs a body.
2795 if Is_Child_Unit
(E
) then
2798 -- Ignore formal packages and their renamings
2800 elsif Ekind
(E
) = E_Package
2801 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
2802 N_Formal_Package_Declaration
2806 -- Otherwise test to see if entity requires a completion.
2807 -- Note that subprogram entities whose declaration does not come
2808 -- from source are ignored here on the basis that we assume the
2809 -- expander will provide an implicit completion at some point.
2811 elsif (Is_Overloadable
(E
)
2812 and then Ekind
(E
) /= E_Enumeration_Literal
2813 and then Ekind
(E
) /= E_Operator
2814 and then not Is_Abstract_Subprogram
(E
)
2815 and then not Has_Completion
(E
)
2816 and then Comes_From_Source
(Parent
(E
)))
2819 (Ekind
(E
) = E_Package
2821 and then not Has_Completion
(E
)
2822 and then Unit_Requires_Body
(E
))
2825 (Ekind
(E
) = E_Incomplete_Type
2826 and then No
(Full_View
(E
))
2827 and then not Is_Generic_Type
(E
))
2830 (Ekind_In
(E
, E_Task_Type
, E_Protected_Type
)
2831 and then not Has_Completion
(E
))
2834 (Ekind
(E
) = E_Generic_Package
2836 and then not Has_Completion
(E
)
2837 and then Unit_Requires_Body
(E
))
2840 (Is_Generic_Subprogram
(E
)
2841 and then not Has_Completion
(E
))
2846 -- Entity that does not require completion
2856 end Unit_Requires_Body
;
2858 -----------------------------
2859 -- Unit_Requires_Body_Info --
2860 -----------------------------
2862 procedure Unit_Requires_Body_Info
(P
: Entity_Id
) is
2866 -- Imported entity never requires body. Right now, only subprograms can
2867 -- be imported, but perhaps in the future we will allow import of
2870 if Is_Imported
(P
) then
2873 -- Body required if library package with pragma Elaborate_Body
2875 elsif Has_Pragma_Elaborate_Body
(P
) then
2877 ("?Y?info: & requires body (Elaborate_Body)", P
);
2879 -- Body required if subprogram
2881 elsif Is_Subprogram
(P
) or else Is_Generic_Subprogram
(P
) then
2882 Error_Msg_N
("?Y?info: & requires body (subprogram case)", P
);
2884 -- Body required if generic parent has Elaborate_Body
2886 elsif Ekind
(P
) = E_Package
2887 and then Nkind
(Parent
(P
)) = N_Package_Specification
2888 and then Present
(Generic_Parent
(Parent
(P
)))
2891 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(P
));
2893 if Has_Pragma_Elaborate_Body
(G_P
) then
2895 ("?Y?info: & requires body (generic parent Elaborate_Body)",
2900 -- A [generic] package that introduces at least one non-null abstract
2901 -- state requires completion. However, there is a separate rule that
2902 -- requires that such a package have a reason other than this for a
2903 -- body being required (if necessary a pragma Elaborate_Body must be
2904 -- provided). If Ignore_Abstract_State is True, we don't do this check
2905 -- (so we can use Unit_Requires_Body to check for some other reason).
2907 elsif Ekind_In
(P
, E_Generic_Package
, E_Package
)
2908 and then Present
(Abstract_States
(P
))
2910 not Is_Null_State
(Node
(First_Elmt
(Abstract_States
(P
))))
2913 ("?Y?info: & requires body (non-null abstract state aspect)", P
);
2916 -- Otherwise search entity chain for entity requiring completion
2918 E
:= First_Entity
(P
);
2919 while Present
(E
) loop
2921 -- Always ignore child units. Child units get added to the entity
2922 -- list of a parent unit, but are not original entities of the
2923 -- parent, and so do not affect whether the parent needs a body.
2925 if Is_Child_Unit
(E
) then
2928 -- Ignore formal packages and their renamings
2930 elsif Ekind
(E
) = E_Package
2931 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
2932 N_Formal_Package_Declaration
2936 -- Otherwise test to see if entity requires a completion.
2937 -- Note that subprogram entities whose declaration does not come
2938 -- from source are ignored here on the basis that we assume the
2939 -- expander will provide an implicit completion at some point.
2941 elsif (Is_Overloadable
(E
)
2942 and then Ekind
(E
) /= E_Enumeration_Literal
2943 and then Ekind
(E
) /= E_Operator
2944 and then not Is_Abstract_Subprogram
(E
)
2945 and then not Has_Completion
(E
)
2946 and then Comes_From_Source
(Parent
(E
)))
2949 (Ekind
(E
) = E_Package
2951 and then not Has_Completion
(E
)
2952 and then Unit_Requires_Body
(E
))
2955 (Ekind
(E
) = E_Incomplete_Type
2956 and then No
(Full_View
(E
))
2957 and then not Is_Generic_Type
(E
))
2960 (Ekind_In
(E
, E_Task_Type
, E_Protected_Type
)
2961 and then not Has_Completion
(E
))
2964 (Ekind
(E
) = E_Generic_Package
2966 and then not Has_Completion
(E
)
2967 and then Unit_Requires_Body
(E
))
2970 (Is_Generic_Subprogram
(E
)
2971 and then not Has_Completion
(E
))
2974 Error_Msg_Node_2
:= E
;
2976 ("?Y?info: & requires body (& requires completion)",
2979 -- Entity that does not require completion
2987 end Unit_Requires_Body_Info
;