1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2008, 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
29 -- dispatch tables for tagged types.
31 with Atree
; use Atree
;
32 with Debug
; use Debug
;
33 with Einfo
; use Einfo
;
34 with Elists
; use Elists
;
35 with Errout
; use Errout
;
36 with Exp_Disp
; use Exp_Disp
;
37 with Exp_Dist
; use Exp_Dist
;
38 with Exp_Dbug
; use Exp_Dbug
;
40 with Lib
.Xref
; use Lib
.Xref
;
41 with Namet
; use Namet
;
42 with Nmake
; use Nmake
;
43 with Nlists
; use Nlists
;
45 with Output
; use Output
;
47 with Sem_Cat
; use Sem_Cat
;
48 with Sem_Ch3
; use Sem_Ch3
;
49 with Sem_Ch6
; use Sem_Ch6
;
50 with Sem_Ch8
; use Sem_Ch8
;
51 with Sem_Ch10
; use Sem_Ch10
;
52 with Sem_Ch12
; use Sem_Ch12
;
53 with Sem_Disp
; use Sem_Disp
;
54 with Sem_Prag
; use Sem_Prag
;
55 with Sem_Util
; use Sem_Util
;
56 with Sem_Warn
; use Sem_Warn
;
57 with Snames
; use Snames
;
58 with Stand
; use Stand
;
59 with Sinfo
; use Sinfo
;
60 with Sinput
; use Sinput
;
62 with Uintp
; use Uintp
;
64 package body Sem_Ch7
is
66 -----------------------------------
67 -- Handling private declarations --
68 -----------------------------------
70 -- The principle that each entity has a single defining occurrence clashes
71 -- with the presence of two separate definitions for private types: the
72 -- first is the private type declaration, and the second is the full type
73 -- declaration. It is important that all references to the type point to
74 -- the same defining occurrence, namely the first one. To enforce the two
75 -- separate views of the entity, the corresponding information is swapped
76 -- between the two declarations. Outside of the package, the defining
77 -- occurrence only contains the private declaration information, while in
78 -- the private part and the body of the package the defining occurrence
79 -- contains the full declaration. To simplify the swap, the defining
80 -- occurrence that currently holds the private declaration points to the
81 -- full declaration. During semantic processing the defining occurrence
82 -- also points to a list of private dependents, that is to say access types
83 -- or composite types whose designated types or component types are
84 -- subtypes or derived types of the private type in question. After the
85 -- full declaration has been seen, the private dependents are updated to
86 -- indicate that they have full definitions.
88 -----------------------
89 -- Local Subprograms --
90 -----------------------
92 procedure Check_Anonymous_Access_Types
95 -- If the spec of a package has a limited_with_clause, it may declare
96 -- anonymous access types whose designated type is a limited view, such an
97 -- anonymous access return type for a function. This access type cannot be
98 -- elaborated in the spec itself, but it may need an itype reference if it
99 -- is used within a nested scope. In that case the itype reference is
100 -- created at the beginning of the corresponding package body and inserted
101 -- before other body declarations.
103 procedure Install_Package_Entity
(Id
: Entity_Id
);
104 -- Supporting procedure for Install_{Visible,Private}_Declarations.
105 -- Places one entity on its visibility chain, and recurses on the visible
106 -- part if the entity is an inner package.
108 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean;
109 -- True for a private type that is not a subtype
111 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean;
112 -- If the private dependent is a private type whose full view is derived
113 -- from the parent type, its full properties are revealed only if we are in
114 -- the immediate scope of the private dependent. Should this predicate be
115 -- tightened further???
117 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
);
118 -- Called upon entering the private part of a public child package and the
119 -- body of a nested package, to potentially declare certain inherited
120 -- subprograms that were inherited by types in the visible part, but whose
121 -- declaration was deferred because the parent operation was private and
122 -- not visible at that point. These subprograms are located by traversing
123 -- the visible part declarations looking for non-private type extensions
124 -- and then examining each of the primitive operations of such types to
125 -- find those that were inherited but declared with a special internal
126 -- name. Each such operation is now declared as an operation with a normal
127 -- name (using the name of the parent operation) and replaces the previous
128 -- implicit operation in the primitive operations list of the type. If the
129 -- inherited private operation has been overridden, then it's replaced by
130 -- the overriding operation.
132 --------------------------
133 -- Analyze_Package_Body --
134 --------------------------
136 procedure Analyze_Package_Body
(N
: Node_Id
) is
137 Loc
: constant Source_Ptr
:= Sloc
(N
);
141 Last_Spec_Entity
: Entity_Id
;
145 procedure Install_Composite_Operations
(P
: Entity_Id
);
146 -- Composite types declared in the current scope may depend on
147 -- types that were private at the point of declaration, and whose
148 -- full view is now in scope. Indicate that the corresponding
149 -- operations on the composite type are available.
151 ----------------------------------
152 -- Install_Composite_Operations --
153 ----------------------------------
155 procedure Install_Composite_Operations
(P
: Entity_Id
) is
159 Id
:= First_Entity
(P
);
160 while Present
(Id
) loop
162 and then (Is_Limited_Composite
(Id
)
163 or else Is_Private_Composite
(Id
))
164 and then No
(Private_Component
(Id
))
166 Set_Is_Limited_Composite
(Id
, False);
167 Set_Is_Private_Composite
(Id
, False);
172 end Install_Composite_Operations
;
174 -- Start of processing for Analyze_Package_Body
177 -- Find corresponding package specification, and establish the
178 -- current scope. The visible defining entity for the package is the
179 -- defining occurrence in the spec. On exit from the package body, all
180 -- body declarations are attached to the defining entity for the body,
181 -- but the later is never used for name resolution. In this fashion
182 -- there is only one visible entity that denotes the package.
185 Write_Str
("==== Compiling package body ");
186 Write_Name
(Chars
(Defining_Entity
(N
)));
187 Write_Str
(" from ");
188 Write_Location
(Loc
);
192 -- Set Body_Id. Note that this Will be reset to point to the
193 -- generic copy later on in the generic case.
195 Body_Id
:= Defining_Entity
(N
);
197 if Present
(Corresponding_Spec
(N
)) then
199 -- Body is body of package instantiation. Corresponding spec
200 -- has already been set.
202 Spec_Id
:= Corresponding_Spec
(N
);
203 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
206 Spec_Id
:= Current_Entity_In_Scope
(Defining_Entity
(N
));
209 and then Is_Package_Or_Generic_Package
(Spec_Id
)
211 Pack_Decl
:= Unit_Declaration_Node
(Spec_Id
);
213 if Nkind
(Pack_Decl
) = N_Package_Renaming_Declaration
then
214 Error_Msg_N
("cannot supply body for package renaming", N
);
217 elsif Present
(Corresponding_Body
(Pack_Decl
)) then
218 Error_Msg_N
("redefinition of package body", N
);
223 Error_Msg_N
("missing specification for package body", N
);
227 if Is_Package_Or_Generic_Package
(Spec_Id
)
229 (Scope
(Spec_Id
) = Standard_Standard
230 or else Is_Child_Unit
(Spec_Id
))
231 and then not Unit_Requires_Body
(Spec_Id
)
233 if Ada_Version
= Ada_83
then
235 ("optional package body (not allowed in Ada 95)?", N
);
238 ("spec of this package does not allow a body", N
);
243 Set_Is_Compilation_Unit
(Body_Id
, Is_Compilation_Unit
(Spec_Id
));
244 Style
.Check_Identifier
(Body_Id
, Spec_Id
);
246 if Is_Child_Unit
(Spec_Id
) then
247 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
249 ("body of child unit& cannot be an inner package", N
, Spec_Id
);
252 Set_Is_Child_Unit
(Body_Id
);
255 -- Generic package case
257 if Ekind
(Spec_Id
) = E_Generic_Package
then
259 -- Disable expansion and perform semantic analysis on copy.
260 -- The unannotated body will be used in all instantiations.
262 Body_Id
:= Defining_Entity
(N
);
263 Set_Ekind
(Body_Id
, E_Package_Body
);
264 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
265 Set_Is_Obsolescent
(Body_Id
, Is_Obsolescent
(Spec_Id
));
266 Set_Body_Entity
(Spec_Id
, Body_Id
);
267 Set_Spec_Entity
(Body_Id
, Spec_Id
);
269 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
272 -- Update Body_Id to point to the copied node for the remainder
273 -- of the processing.
275 Body_Id
:= Defining_Entity
(N
);
279 -- The Body_Id is that of the copied node in the generic case, the
280 -- current node otherwise. Note that N was rewritten above, so we
281 -- must be sure to get the latest Body_Id value.
283 Set_Ekind
(Body_Id
, E_Package_Body
);
284 Set_Body_Entity
(Spec_Id
, Body_Id
);
285 Set_Spec_Entity
(Body_Id
, Spec_Id
);
287 -- Defining name for the package body is not a visible entity: Only
288 -- the defining name for the declaration is visible.
290 Set_Etype
(Body_Id
, Standard_Void_Type
);
291 Set_Scope
(Body_Id
, Scope
(Spec_Id
));
292 Set_Corresponding_Spec
(N
, Spec_Id
);
293 Set_Corresponding_Body
(Pack_Decl
, Body_Id
);
295 -- The body entity is not used for semantics or code generation, but
296 -- it is attached to the entity list of the enclosing scope to simplify
297 -- the listing of back-annotations for the types it main contain.
299 if Scope
(Spec_Id
) /= Standard_Standard
then
300 Append_Entity
(Body_Id
, Scope
(Spec_Id
));
303 -- Indicate that we are currently compiling the body of the package
305 Set_In_Package_Body
(Spec_Id
);
306 Set_Has_Completion
(Spec_Id
);
307 Last_Spec_Entity
:= Last_Entity
(Spec_Id
);
309 Push_Scope
(Spec_Id
);
311 Set_Categorization_From_Pragmas
(N
);
313 Install_Visible_Declarations
(Spec_Id
);
314 Install_Private_Declarations
(Spec_Id
);
315 Install_Private_With_Clauses
(Spec_Id
);
316 Install_Composite_Operations
(Spec_Id
);
318 Check_Anonymous_Access_Types
(Spec_Id
, N
);
320 if Ekind
(Spec_Id
) = E_Generic_Package
then
321 Set_Use
(Generic_Formal_Declarations
(Pack_Decl
));
324 Set_Use
(Visible_Declarations
(Specification
(Pack_Decl
)));
325 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
327 -- This is a nested package, so it may be necessary to declare certain
328 -- inherited subprograms that are not yet visible because the parent
329 -- type's subprograms are now visible.
331 if Ekind
(Scope
(Spec_Id
)) = E_Package
332 and then Scope
(Spec_Id
) /= Standard_Standard
334 Declare_Inherited_Private_Subprograms
(Spec_Id
);
337 if Present
(Declarations
(N
)) then
338 Analyze_Declarations
(Declarations
(N
));
339 Inspect_Deferred_Constant_Completion
(Declarations
(N
));
342 -- Analyze_Declarations has caused freezing of all types; now generate
343 -- bodies for RACW primitives and stream attributes, if any.
345 if Ekind
(Spec_Id
) = E_Package
and then Has_RACW
(Spec_Id
) then
347 -- Attach subprogram bodies to support RACWs declared in spec
349 Append_RACW_Bodies
(Declarations
(N
), Spec_Id
);
350 Analyze_List
(Declarations
(N
));
353 HSS
:= Handled_Statement_Sequence
(N
);
355 if Present
(HSS
) then
356 Process_End_Label
(HSS
, 't', Spec_Id
);
359 -- Check that elaboration code in a preelaborable package body is
360 -- empty other than null statements and labels (RM 10.2.1(6)).
362 Validate_Null_Statement_Sequence
(N
);
365 Validate_Categorization_Dependency
(N
, Spec_Id
);
366 Check_Completion
(Body_Id
);
368 -- Generate start of body reference. Note that we do this fairly late,
369 -- because the call will use In_Extended_Main_Source_Unit as a check,
370 -- and we want to make sure that Corresponding_Stub links are set
372 Generate_Reference
(Spec_Id
, Body_Id
, 'b', Set_Ref
=> False);
374 -- For a generic package, collect global references and mark them on
375 -- the original body so that they are not resolved again at the point
378 if Ekind
(Spec_Id
) /= E_Package
then
379 Save_Global_References
(Original_Node
(N
));
383 -- The entities of the package body have so far been chained onto the
384 -- declaration chain for the spec. That's been fine while we were in the
385 -- body, since we wanted them to be visible, but now that we are leaving
386 -- the package body, they are no longer visible, so we remove them from
387 -- the entity chain of the package spec entity, and copy them to the
388 -- entity chain of the package body entity, where they will never again
391 if Present
(Last_Spec_Entity
) then
392 Set_First_Entity
(Body_Id
, Next_Entity
(Last_Spec_Entity
));
393 Set_Next_Entity
(Last_Spec_Entity
, Empty
);
394 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
395 Set_Last_Entity
(Spec_Id
, Last_Spec_Entity
);
398 Set_First_Entity
(Body_Id
, First_Entity
(Spec_Id
));
399 Set_Last_Entity
(Body_Id
, Last_Entity
(Spec_Id
));
400 Set_First_Entity
(Spec_Id
, Empty
);
401 Set_Last_Entity
(Spec_Id
, Empty
);
404 End_Package_Scope
(Spec_Id
);
406 -- All entities declared in body are not visible
412 E
:= First_Entity
(Body_Id
);
413 while Present
(E
) loop
414 Set_Is_Immediately_Visible
(E
, False);
415 Set_Is_Potentially_Use_Visible
(E
, False);
418 -- Child units may appear on the entity list (for example if
419 -- they appear in the context of a subunit) but they are not
422 if not Is_Child_Unit
(E
) then
423 Set_Is_Package_Body_Entity
(E
);
430 Check_References
(Body_Id
);
432 -- For a generic unit, check that the formal parameters are referenced,
433 -- and that local variables are used, as for regular packages.
435 if Ekind
(Spec_Id
) = E_Generic_Package
then
436 Check_References
(Spec_Id
);
439 -- The processing so far has made all entities of the package body
440 -- public (i.e. externally visible to the linker). This is in general
441 -- necessary, since inlined or generic bodies, for which code is
442 -- generated in other units, may need to see these entities. The
443 -- following loop runs backwards from the end of the entities of the
444 -- package body making these entities invisible until we reach a
445 -- referencer, i.e. a declaration that could reference a previous
446 -- declaration, a generic body or an inlined body, or a stub (which
447 -- may contain either of these). This is of course an approximation,
448 -- but it is conservative and definitely correct.
450 -- We only do this at the outer (library) level non-generic packages.
451 -- The reason is simply to cut down on the number of external symbols
452 -- generated, so this is simply an optimization of the efficiency
453 -- of the compilation process. It has no other effect.
455 if (Scope
(Spec_Id
) = Standard_Standard
or else Is_Child_Unit
(Spec_Id
))
456 and then not Is_Generic_Unit
(Spec_Id
)
457 and then Present
(Declarations
(N
))
459 Make_Non_Public_Where_Possible
: declare
461 function Has_Referencer
465 -- Traverse the given list of declarations in reverse order.
466 -- Return True as soon as a referencer is reached. Return
467 -- False if none is found. The Outer parameter is True for
468 -- the outer level call, and False for inner level calls for
469 -- nested packages. If Outer is True, then any entities up
470 -- to the point of hitting a referencer get their Is_Public
471 -- flag cleared, so that the entities will be treated as
472 -- static entities in the C sense, and need not have fully
473 -- qualified names. For inner levels, we need all names to
474 -- be fully qualified to deal with the same name appearing
475 -- in parallel packages (right now this is tied to their
482 function Has_Referencer
498 while Present
(D
) loop
501 if K
in N_Body_Stub
then
504 elsif K
= N_Subprogram_Body
then
505 if Acts_As_Spec
(D
) then
506 E
:= Defining_Entity
(D
);
508 -- An inlined body acts as a referencer. Note also
509 -- that we never reset Is_Public for an inlined
510 -- subprogram. Gigi requires Is_Public to be set.
512 -- Note that we test Has_Pragma_Inline here rather
513 -- than Is_Inlined. We are compiling this for a
514 -- client, and it is the client who will decide
515 -- if actual inlining should occur, so we need to
516 -- assume that the procedure could be inlined for
517 -- the purpose of accessing global entities.
519 if Has_Pragma_Inline
(E
) then
522 Set_Is_Public
(E
, False);
526 E
:= Corresponding_Spec
(D
);
529 and then (Is_Generic_Unit
(E
)
530 or else Has_Pragma_Inline
(E
)
531 or else Is_Inlined
(E
))
537 -- Processing for package bodies
539 elsif K
= N_Package_Body
540 and then Present
(Corresponding_Spec
(D
))
542 E
:= Corresponding_Spec
(D
);
544 -- Generic package body is a referencer. It would
545 -- seem that we only have to consider generics that
546 -- can be exported, i.e. where the corresponding spec
547 -- is the spec of the current package, but because of
548 -- nested instantiations, a fully private generic
549 -- body may export other private body entities.
551 if Is_Generic_Unit
(E
) then
554 -- For non-generic package body, recurse into body
555 -- unless this is an instance, we ignore instances
556 -- since they cannot have references that affect
559 elsif not Is_Generic_Instance
(E
) then
561 (Declarations
(D
), Outer
=> False)
567 -- Processing for package specs, recurse into declarations.
568 -- Again we skip this for the case of generic instances.
570 elsif K
= N_Package_Declaration
then
571 S
:= Specification
(D
);
573 if not Is_Generic_Unit
(Defining_Entity
(S
)) then
575 (Private_Declarations
(S
), Outer
=> False)
579 (Visible_Declarations
(S
), Outer
=> False)
585 -- Objects and exceptions need not be public if we have
586 -- not encountered a referencer so far. We only reset
587 -- the flag for outer level entities that are not
588 -- imported/exported, and which have no interface name.
590 elsif Nkind_In
(K
, N_Object_Declaration
,
591 N_Exception_Declaration
,
592 N_Subprogram_Declaration
)
594 E
:= Defining_Entity
(D
);
597 and then not Is_Imported
(E
)
598 and then not Is_Exported
(E
)
599 and then No
(Interface_Name
(E
))
601 Set_Is_Public
(E
, False);
611 -- Start of processing for Make_Non_Public_Where_Possible
616 pragma Warnings
(Off
, Discard
);
619 Discard
:= Has_Referencer
(Declarations
(N
), Outer
=> True);
621 end Make_Non_Public_Where_Possible
;
624 -- If expander is not active, then here is where we turn off the
625 -- In_Package_Body flag, otherwise it is turned off at the end of
626 -- the corresponding expansion routine. If this is an instance body,
627 -- we need to qualify names of local entities, because the body may
628 -- have been compiled as a preliminary to another instantiation.
630 if not Expander_Active
then
631 Set_In_Package_Body
(Spec_Id
, False);
633 if Is_Generic_Instance
(Spec_Id
)
634 and then Operating_Mode
= Generate_Code
636 Qualify_Entity_Names
(N
);
639 end Analyze_Package_Body
;
641 ---------------------------------
642 -- Analyze_Package_Declaration --
643 ---------------------------------
645 procedure Analyze_Package_Declaration
(N
: Node_Id
) is
646 Id
: constant Node_Id
:= Defining_Entity
(N
);
649 -- True when in the context of a declared pure library unit
651 Body_Required
: Boolean;
652 -- True when this package declaration requires a corresponding body
655 -- True when this package declaration is not a nested declaration
658 -- Ada 2005 (AI-217): Check if the package has been erroneously named
659 -- in a limited-with clause of its own context. In this case the error
660 -- has been previously notified by Analyze_Context.
662 -- limited with Pkg; -- ERROR
663 -- package Pkg is ...
665 if From_With_Type
(Id
) then
669 Generate_Definition
(Id
);
671 Set_Ekind
(Id
, E_Package
);
672 Set_Etype
(Id
, Standard_Void_Type
);
676 PF
:= Is_Pure
(Enclosing_Lib_Unit_Entity
);
677 Set_Is_Pure
(Id
, PF
);
679 Set_Categorization_From_Pragmas
(N
);
682 Write_Str
("==== Compiling package spec ");
683 Write_Name
(Chars
(Id
));
684 Write_Str
(" from ");
685 Write_Location
(Sloc
(N
));
689 Analyze
(Specification
(N
));
690 Validate_Categorization_Dependency
(N
, Id
);
692 Body_Required
:= Unit_Requires_Body
(Id
);
694 -- When this spec does not require an explicit body, we know that
695 -- there are no entities requiring completion in the language sense;
696 -- we call Check_Completion here only to ensure that any nested package
697 -- declaration that requires an implicit body gets one. (In the case
698 -- where a body is required, Check_Completion is called at the end of
699 -- the body's declarative part.)
701 if not Body_Required
then
705 Comp_Unit
:= Nkind
(Parent
(N
)) = N_Compilation_Unit
;
708 -- Set Body_Required indication on the compilation unit node, and
709 -- determine whether elaboration warnings may be meaningful on it.
711 Set_Body_Required
(Parent
(N
), Body_Required
);
713 if not Body_Required
then
714 Set_Suppress_Elaboration_Warnings
(Id
);
719 End_Package_Scope
(Id
);
721 -- For the declaration of a library unit that is a remote types package,
722 -- check legality rules regarding availability of stream attributes for
723 -- types that contain non-remote access values. This subprogram performs
724 -- visibility tests that rely on the fact that we have exited the scope
728 Validate_RT_RAT_Component
(N
);
730 end Analyze_Package_Declaration
;
732 -----------------------------------
733 -- Analyze_Package_Specification --
734 -----------------------------------
736 -- Note that this code is shared for the analysis of generic package
737 -- specs (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
739 procedure Analyze_Package_Specification
(N
: Node_Id
) is
740 Id
: constant Entity_Id
:= Defining_Entity
(N
);
741 Orig_Decl
: constant Node_Id
:= Original_Node
(Parent
(N
));
742 Vis_Decls
: constant List_Id
:= Visible_Declarations
(N
);
743 Priv_Decls
: constant List_Id
:= Private_Declarations
(N
);
746 Public_Child
: Boolean;
748 Private_With_Clauses_Installed
: Boolean := False;
749 -- In Ada 2005, private with_clauses are visible in the private part
750 -- of a nested package, even if it appears in the public part of the
751 -- enclosing package. This requires a separate step to install these
752 -- private_with_clauses, and remove them at the end of the nested
755 procedure Analyze_PPCs
(Decls
: List_Id
);
756 -- Given a list of declarations, go through looking for subprogram
757 -- specs, and for each one found, analyze any pre/postconditions that
758 -- are chained to the spec. This is the implementation of the late
759 -- visibility analysis for preconditions and postconditions in specs.
761 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
);
762 -- Clears constant indications (Never_Set_In_Source, Constant_Value,
763 -- and Is_True_Constant) on all variables that are entities of Id,
764 -- and on the chain whose first element is FE. A recursive call is
765 -- made for all packages and generic packages.
767 procedure Generate_Parent_References
;
768 -- For a child unit, generate references to parent units, for
769 -- GPS navigation purposes.
771 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean;
772 -- Child and Unit are entities of compilation units. True if Child
773 -- is a public child of Parent as defined in 10.1.1
775 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
);
776 -- Detects all incomplete or private type declarations having a known
777 -- discriminant part that are completed by an Unchecked_Union. Emits
778 -- the error message "Unchecked_Union may not complete discriminated
781 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
);
782 -- Given the package entity of a generic package instantiation or
783 -- formal package whose corresponding generic is a child unit, installs
784 -- the private declarations of each of the child unit's parents.
785 -- This has to be done at the point of entering the instance package's
786 -- private part rather than being done in Sem_Ch12.Install_Parent
787 -- (which is where the parents' visible declarations are installed).
793 procedure Analyze_PPCs
(Decls
: List_Id
) is
800 Decl
:= First
(Decls
);
801 while Present
(Decl
) loop
802 if Nkind
(Original_Node
(Decl
)) = N_Subprogram_Declaration
then
803 Spec
:= Specification
(Original_Node
(Decl
));
804 Sent
:= Defining_Unit_Name
(Spec
);
805 Prag
:= Spec_PPC_List
(Sent
);
806 while Present
(Prag
) loop
807 Analyze_PPC_In_Decl_Part
(Prag
, Sent
);
808 Prag
:= Next_Pragma
(Prag
);
816 ---------------------
817 -- Clear_Constants --
818 ---------------------
820 procedure Clear_Constants
(Id
: Entity_Id
; FE
: Entity_Id
) is
824 -- Ignore package renamings, not interesting and they can
825 -- cause self referential loops in the code below.
827 if Nkind
(Parent
(Id
)) = N_Package_Renaming_Declaration
then
831 -- Note: in the loop below, the check for Next_Entity pointing
832 -- back to the package entity may seem odd, but it is needed,
833 -- because a package can contain a renaming declaration to itself,
834 -- and such renamings are generated automatically within package
838 while Present
(E
) and then E
/= Id
loop
839 if Is_Assignable
(E
) then
840 Set_Never_Set_In_Source
(E
, False);
841 Set_Is_True_Constant
(E
, False);
842 Set_Current_Value
(E
, Empty
);
843 Set_Is_Known_Null
(E
, False);
844 Set_Last_Assignment
(E
, Empty
);
846 if not Can_Never_Be_Null
(E
) then
847 Set_Is_Known_Non_Null
(E
, False);
850 elsif Ekind
(E
) = E_Package
852 Ekind
(E
) = E_Generic_Package
854 Clear_Constants
(E
, First_Entity
(E
));
855 Clear_Constants
(E
, First_Private_Entity
(E
));
862 --------------------------------
863 -- Generate_Parent_References --
864 --------------------------------
866 procedure Generate_Parent_References
is
867 Decl
: constant Node_Id
:= Parent
(N
);
870 if Id
= Cunit_Entity
(Main_Unit
)
871 or else Parent
(Decl
) = Library_Unit
(Cunit
(Main_Unit
))
873 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
875 elsif not Nkind_In
(Unit
(Cunit
(Main_Unit
)), N_Subprogram_Body
,
878 -- If current unit is an ancestor of main unit, generate
879 -- a reference to its own parent.
883 Main_Spec
: Node_Id
:= Unit
(Cunit
(Main_Unit
));
886 if Nkind
(Main_Spec
) = N_Package_Body
then
887 Main_Spec
:= Unit
(Library_Unit
(Cunit
(Main_Unit
)));
890 U
:= Parent_Spec
(Main_Spec
);
891 while Present
(U
) loop
892 if U
= Parent
(Decl
) then
893 Generate_Reference
(Id
, Scope
(Id
), 'k', False);
896 elsif Nkind
(Unit
(U
)) = N_Package_Body
then
900 U
:= Parent_Spec
(Unit
(U
));
905 end Generate_Parent_References
;
907 ---------------------
908 -- Is_Public_Child --
909 ---------------------
911 function Is_Public_Child
(Child
, Unit
: Entity_Id
) return Boolean is
913 if not Is_Private_Descendant
(Child
) then
917 return not Private_Present
(
918 Parent
(Unit_Declaration_Node
(Child
)));
920 return Is_Public_Child
(Scope
(Child
), Unit
);
925 ----------------------------------------
926 -- Inspect_Unchecked_Union_Completion --
927 ----------------------------------------
929 procedure Inspect_Unchecked_Union_Completion
(Decls
: List_Id
) is
933 Decl
:= First
(Decls
);
934 while Present
(Decl
) loop
936 -- We are looking at an incomplete or private type declaration
937 -- with a known_discriminant_part whose full view is an
940 if Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
941 N_Private_Type_Declaration
)
942 and then Has_Discriminants
(Defining_Identifier
(Decl
))
943 and then Present
(Full_View
(Defining_Identifier
(Decl
)))
945 Is_Unchecked_Union
(Full_View
(Defining_Identifier
(Decl
)))
948 ("completion of discriminated partial view "
949 & "cannot be an Unchecked_Union",
950 Full_View
(Defining_Identifier
(Decl
)));
955 end Inspect_Unchecked_Union_Completion
;
957 -----------------------------------------
958 -- Install_Parent_Private_Declarations --
959 -----------------------------------------
961 procedure Install_Parent_Private_Declarations
(Inst_Id
: Entity_Id
) is
962 Inst_Par
: Entity_Id
;
970 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
971 while Present
(Gen_Par
) and then Is_Child_Unit
(Gen_Par
) loop
972 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
974 if Nkind_In
(Inst_Node
, N_Package_Instantiation
,
975 N_Formal_Package_Declaration
)
976 and then Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
978 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
980 if Present
(Renamed_Entity
(Inst_Par
)) then
981 Inst_Par
:= Renamed_Entity
(Inst_Par
);
986 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
988 -- Install the private declarations and private use clauses
989 -- of a parent instance of the child instance, unless the
990 -- parent instance private declarations have already been
991 -- installed earlier in Analyze_Package_Specification, which
992 -- happens when a generic child is instantiated, and the
993 -- instance is a child of the parent instance.
995 -- Installing the use clauses of the parent instance twice
996 -- is both unnecessary and wrong, because it would cause the
997 -- clauses to be chained to themselves in the use clauses
998 -- list of the scope stack entry. That in turn would cause
999 -- an endless loop from End_Use_Clauses upon scope exit.
1001 -- The parent is now fully visible. It may be a hidden open
1002 -- scope if we are currently compiling some child instance
1003 -- declared within it, but while the current instance is being
1004 -- compiled the parent is immediately visible. In particular
1005 -- its entities must remain visible if a stack save/restore
1006 -- takes place through a call to Rtsfind.
1008 if Present
(Gen_Par
) then
1009 if not In_Private_Part
(Inst_Par
) then
1010 Install_Private_Declarations
(Inst_Par
);
1011 Set_Use
(Private_Declarations
1013 (Unit_Declaration_Node
(Inst_Par
))));
1014 Set_Is_Hidden_Open_Scope
(Inst_Par
, False);
1017 -- If we've reached the end of the generic instance parents,
1018 -- then finish off by looping through the nongeneric parents
1019 -- and installing their private declarations.
1022 while Present
(Inst_Par
)
1023 and then Inst_Par
/= Standard_Standard
1024 and then (not In_Open_Scopes
(Inst_Par
)
1025 or else not In_Private_Part
(Inst_Par
))
1027 Install_Private_Declarations
(Inst_Par
);
1028 Set_Use
(Private_Declarations
1030 (Unit_Declaration_Node
(Inst_Par
))));
1031 Inst_Par
:= Scope
(Inst_Par
);
1041 end Install_Parent_Private_Declarations
;
1043 -- Start of processing for Analyze_Package_Specification
1046 if Present
(Vis_Decls
) then
1047 Analyze_Declarations
(Vis_Decls
);
1048 Analyze_PPCs
(Vis_Decls
);
1051 -- Verify that incomplete types have received full declarations
1053 E
:= First_Entity
(Id
);
1054 while Present
(E
) loop
1055 if Ekind
(E
) = E_Incomplete_Type
1056 and then No
(Full_View
(E
))
1058 Error_Msg_N
("no declaration in visible part for incomplete}", E
);
1064 if Is_Remote_Call_Interface
(Id
)
1065 and then Nkind
(Parent
(Parent
(N
))) = N_Compilation_Unit
1067 Validate_RCI_Declarations
(Id
);
1070 -- Save global references in the visible declarations, before
1071 -- installing private declarations of parent unit if there is one,
1072 -- because the privacy status of types defined in the parent will
1073 -- change. This is only relevant for generic child units, but is
1074 -- done in all cases for uniformity.
1076 if Ekind
(Id
) = E_Generic_Package
1077 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1080 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1081 Save_Priv
: constant List_Id
:= Private_Declarations
(Orig_Spec
);
1084 Set_Private_Declarations
(Orig_Spec
, Empty_List
);
1085 Save_Global_References
(Orig_Decl
);
1086 Set_Private_Declarations
(Orig_Spec
, Save_Priv
);
1090 -- If package is a public child unit, then make the private declarations
1091 -- of the parent visible.
1093 Public_Child
:= False;
1097 Pack_Decl
: Node_Id
;
1102 Par_Spec
:= Parent_Spec
(Parent
(N
));
1104 -- If the package is formal package of an enclosing generic, it is
1105 -- transformed into a local generic declaration, and compiled to make
1106 -- its spec available. We need to retrieve the original generic to
1107 -- determine whether it is a child unit, and install its parents.
1111 Nkind
(Original_Node
(Parent
(N
))) = N_Formal_Package_Declaration
1113 Par
:= Entity
(Name
(Original_Node
(Parent
(N
))));
1114 Par_Spec
:= Parent_Spec
(Unit_Declaration_Node
(Par
));
1117 if Present
(Par_Spec
) then
1118 Generate_Parent_References
;
1120 while Scope
(Par
) /= Standard_Standard
1121 and then Is_Public_Child
(Id
, Par
)
1122 and then In_Open_Scopes
(Par
)
1124 Public_Child
:= True;
1126 Install_Private_Declarations
(Par
);
1127 Install_Private_With_Clauses
(Par
);
1128 Pack_Decl
:= Unit_Declaration_Node
(Par
);
1129 Set_Use
(Private_Declarations
(Specification
(Pack_Decl
)));
1134 if Is_Compilation_Unit
(Id
) then
1135 Install_Private_With_Clauses
(Id
);
1138 -- The current compilation unit may include private with_clauses,
1139 -- which are visible in the private part of the current nested
1140 -- package, and have to be installed now. This is not done for
1141 -- nested instantiations, where the private with_clauses of the
1142 -- enclosing unit have no effect once the instantiation info is
1143 -- established and we start analyzing the package declaration.
1146 Comp_Unit
: constant Entity_Id
:= Cunit_Entity
(Current_Sem_Unit
);
1148 if (Ekind
(Comp_Unit
) = E_Package
1149 or else Ekind
(Comp_Unit
) = E_Generic_Package
)
1150 and then not In_Private_Part
(Comp_Unit
)
1151 and then not In_Instance
1153 Install_Private_With_Clauses
(Comp_Unit
);
1154 Private_With_Clauses_Installed
:= True;
1159 -- If this is a package associated with a generic instance or formal
1160 -- package, then the private declarations of each of the generic's
1161 -- parents must be installed at this point.
1163 if Is_Generic_Instance
(Id
) then
1164 Install_Parent_Private_Declarations
(Id
);
1167 -- Analyze private part if present. The flag In_Private_Part is reset
1168 -- in End_Package_Scope.
1170 L
:= Last_Entity
(Id
);
1172 if Present
(Priv_Decls
) then
1173 Set_In_Private_Part
(Id
);
1175 -- Upon entering a public child's private part, it may be necessary
1176 -- to declare subprograms that were derived in the package's visible
1177 -- part but not yet made visible.
1179 if Public_Child
then
1180 Declare_Inherited_Private_Subprograms
(Id
);
1183 Analyze_Declarations
(Priv_Decls
);
1184 Analyze_PPCs
(Priv_Decls
);
1186 -- Check the private declarations for incomplete deferred constants
1188 Inspect_Deferred_Constant_Completion
(Priv_Decls
);
1190 -- The first private entity is the immediate follower of the last
1191 -- visible entity, if there was one.
1194 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1196 Set_First_Private_Entity
(Id
, First_Entity
(Id
));
1199 -- There may be inherited private subprograms that need to be declared,
1200 -- even in the absence of an explicit private part. If there are any
1201 -- public declarations in the package and the package is a public child
1202 -- unit, then an implicit private part is assumed.
1204 elsif Present
(L
) and then Public_Child
then
1205 Set_In_Private_Part
(Id
);
1206 Declare_Inherited_Private_Subprograms
(Id
);
1207 Set_First_Private_Entity
(Id
, Next_Entity
(L
));
1210 E
:= First_Entity
(Id
);
1211 while Present
(E
) loop
1213 -- Check rule of 3.6(11), which in general requires waiting till all
1214 -- full types have been seen.
1216 if Ekind
(E
) = E_Record_Type
or else Ekind
(E
) = E_Array_Type
then
1217 Check_Aliased_Component_Types
(E
);
1220 -- Check preelaborable initialization for full type completing a
1221 -- private type for which pragma Preelaborable_Initialization given.
1224 and then Must_Have_Preelab_Init
(E
)
1225 and then not Has_Preelaborable_Initialization
(E
)
1228 ("full view of & does not have preelaborable initialization", E
);
1234 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1235 -- declaration having a known_discriminant_part shall not be an
1236 -- Unchecked_Union type.
1238 if Present
(Vis_Decls
) then
1239 Inspect_Unchecked_Union_Completion
(Vis_Decls
);
1242 if Present
(Priv_Decls
) then
1243 Inspect_Unchecked_Union_Completion
(Priv_Decls
);
1246 if Ekind
(Id
) = E_Generic_Package
1247 and then Nkind
(Orig_Decl
) = N_Generic_Package_Declaration
1248 and then Present
(Priv_Decls
)
1250 -- Save global references in private declarations, ignoring the
1251 -- visible declarations that were processed earlier.
1254 Orig_Spec
: constant Node_Id
:= Specification
(Orig_Decl
);
1255 Save_Vis
: constant List_Id
:= Visible_Declarations
(Orig_Spec
);
1256 Save_Form
: constant List_Id
:=
1257 Generic_Formal_Declarations
(Orig_Decl
);
1260 Set_Visible_Declarations
(Orig_Spec
, Empty_List
);
1261 Set_Generic_Formal_Declarations
(Orig_Decl
, Empty_List
);
1262 Save_Global_References
(Orig_Decl
);
1263 Set_Generic_Formal_Declarations
(Orig_Decl
, Save_Form
);
1264 Set_Visible_Declarations
(Orig_Spec
, Save_Vis
);
1268 Process_End_Label
(N
, 'e', Id
);
1270 -- Remove private_with_clauses of enclosing compilation unit, if they
1273 if Private_With_Clauses_Installed
then
1274 Remove_Private_With_Clauses
(Cunit
(Current_Sem_Unit
));
1277 -- For the case of a library level package, we must go through all the
1278 -- entities clearing the indications that the value may be constant and
1279 -- not modified. Why? Because any client of this package may modify
1280 -- these values freely from anywhere. This also applies to any nested
1281 -- packages or generic packages.
1283 -- For now we unconditionally clear constants for packages that are
1284 -- instances of generic packages. The reason is that we do not have the
1285 -- body yet, and we otherwise think things are unreferenced when they
1286 -- are not. This should be fixed sometime (the effect is not terrible,
1287 -- we just lose some warnings, and also some cases of value propagation)
1290 if Is_Library_Level_Entity
(Id
)
1291 or else Is_Generic_Instance
(Id
)
1293 Clear_Constants
(Id
, First_Entity
(Id
));
1294 Clear_Constants
(Id
, First_Private_Entity
(Id
));
1296 end Analyze_Package_Specification
;
1298 --------------------------------------
1299 -- Analyze_Private_Type_Declaration --
1300 --------------------------------------
1302 procedure Analyze_Private_Type_Declaration
(N
: Node_Id
) is
1303 PF
: constant Boolean := Is_Pure
(Enclosing_Lib_Unit_Entity
);
1304 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1307 Generate_Definition
(Id
);
1308 Set_Is_Pure
(Id
, PF
);
1309 Init_Size_Align
(Id
);
1311 if (Ekind
(Current_Scope
) /= E_Package
1312 and then Ekind
(Current_Scope
) /= E_Generic_Package
)
1313 or else In_Private_Part
(Current_Scope
)
1315 Error_Msg_N
("invalid context for private declaration", N
);
1318 New_Private_Type
(N
, Id
, N
);
1319 Set_Depends_On_Private
(Id
);
1320 end Analyze_Private_Type_Declaration
;
1322 ----------------------------------
1323 -- Check_Anonymous_Access_Types --
1324 ----------------------------------
1326 procedure Check_Anonymous_Access_Types
1327 (Spec_Id
: Entity_Id
;
1334 -- Itype references are only needed by gigi, to force elaboration of
1335 -- itypes. In the absence of code generation, they are not needed.
1337 if not Expander_Active
then
1341 E
:= First_Entity
(Spec_Id
);
1342 while Present
(E
) loop
1343 if Ekind
(E
) = E_Anonymous_Access_Type
1344 and then From_With_Type
(E
)
1346 IR
:= Make_Itype_Reference
(Sloc
(P_Body
));
1349 if No
(Declarations
(P_Body
)) then
1350 Set_Declarations
(P_Body
, New_List
(IR
));
1352 Prepend
(IR
, Declarations
(P_Body
));
1358 end Check_Anonymous_Access_Types
;
1360 -------------------------------------------
1361 -- Declare_Inherited_Private_Subprograms --
1362 -------------------------------------------
1364 procedure Declare_Inherited_Private_Subprograms
(Id
: Entity_Id
) is
1366 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean;
1367 -- Check whether an inherited subprogram is an operation of an
1368 -- untagged derived type.
1370 ---------------------
1371 -- Is_Primitive_Of --
1372 ---------------------
1374 function Is_Primitive_Of
(T
: Entity_Id
; S
: Entity_Id
) return Boolean is
1378 -- If the full view is a scalar type, the type is the anonymous
1379 -- base type, but the operation mentions the first subtype, so
1380 -- check the signature against the base type.
1382 if Base_Type
(Etype
(S
)) = Base_Type
(T
) then
1386 Formal
:= First_Formal
(S
);
1387 while Present
(Formal
) loop
1388 if Base_Type
(Etype
(Formal
)) = Base_Type
(T
) then
1392 Next_Formal
(Formal
);
1397 end Is_Primitive_Of
;
1404 Op_Elmt_2
: Elmt_Id
;
1405 Prim_Op
: Entity_Id
;
1406 New_Op
: Entity_Id
:= Empty
;
1407 Parent_Subp
: Entity_Id
;
1410 -- Start of processing for Declare_Inherited_Private_Subprograms
1413 E
:= First_Entity
(Id
);
1414 while Present
(E
) loop
1416 -- If the entity is a nonprivate type extension whose parent
1417 -- type is declared in an open scope, then the type may have
1418 -- inherited operations that now need to be made visible.
1419 -- Ditto if the entity is a formal derived type in a child unit.
1421 if ((Is_Derived_Type
(E
) and then not Is_Private_Type
(E
))
1423 (Nkind
(Parent
(E
)) = N_Private_Extension_Declaration
1424 and then Is_Generic_Type
(E
)))
1425 and then In_Open_Scopes
(Scope
(Etype
(E
)))
1426 and then E
= Base_Type
(E
)
1428 if Is_Tagged_Type
(E
) then
1429 Op_List
:= Primitive_Operations
(E
);
1431 Tag
:= First_Tag_Component
(E
);
1433 Op_Elmt
:= First_Elmt
(Op_List
);
1434 while Present
(Op_Elmt
) loop
1435 Prim_Op
:= Node
(Op_Elmt
);
1437 -- Search primitives that are implicit operations with an
1438 -- internal name whose parent operation has a normal name.
1440 if Present
(Alias
(Prim_Op
))
1441 and then Find_Dispatching_Type
(Alias
(Prim_Op
)) /= E
1442 and then not Comes_From_Source
(Prim_Op
)
1443 and then Is_Internal_Name
(Chars
(Prim_Op
))
1444 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1446 Parent_Subp
:= Alias
(Prim_Op
);
1448 -- Case 1: Check if the type has also an explicit
1449 -- overriding for this primitive.
1451 Op_Elmt_2
:= Next_Elmt
(Op_Elmt
);
1452 while Present
(Op_Elmt_2
) loop
1453 if Chars
(Node
(Op_Elmt_2
)) = Chars
(Parent_Subp
)
1454 and then Type_Conformant
(Prim_Op
, Node
(Op_Elmt_2
))
1456 -- The private inherited operation has been
1457 -- overridden by an explicit subprogram: replace
1458 -- the former by the latter.
1460 New_Op
:= Node
(Op_Elmt_2
);
1461 Replace_Elmt
(Op_Elmt
, New_Op
);
1462 Remove_Elmt
(Op_List
, Op_Elmt_2
);
1463 Set_Is_Overriding_Operation
(New_Op
);
1464 Set_Overridden_Operation
(New_Op
, Parent_Subp
);
1466 -- We don't need to inherit its dispatching slot.
1467 -- Set_All_DT_Position has previously ensured that
1468 -- the same slot was assigned to the two primitives
1471 and then Present
(DTC_Entity
(New_Op
))
1472 and then Present
(DTC_Entity
(Prim_Op
))
1474 pragma Assert
(DT_Position
(New_Op
)
1475 = DT_Position
(Prim_Op
));
1479 goto Next_Primitive
;
1482 Next_Elmt
(Op_Elmt_2
);
1485 -- Case 2: We have not found any explicit overriding and
1486 -- hence we need to declare the operation (i.e., make it
1489 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1491 -- Inherit the dispatching slot if E is already frozen
1494 and then Present
(DTC_Entity
(Alias
(Prim_Op
)))
1496 Set_DTC_Entity_Value
(E
, New_Op
);
1497 Set_DT_Position
(New_Op
,
1498 DT_Position
(Alias
(Prim_Op
)));
1502 (Is_Dispatching_Operation
(New_Op
)
1503 and then Node
(Last_Elmt
(Op_List
)) = New_Op
);
1505 -- Substitute the new operation for the old one
1506 -- in the type's primitive operations list. Since
1507 -- the new operation was also just added to the end
1508 -- of list, the last element must be removed.
1510 -- (Question: is there a simpler way of declaring
1511 -- the operation, say by just replacing the name
1512 -- of the earlier operation, reentering it in the
1513 -- in the symbol table (how?), and marking it as
1516 Replace_Elmt
(Op_Elmt
, New_Op
);
1517 Remove_Last_Elmt
(Op_List
);
1521 Next_Elmt
(Op_Elmt
);
1524 -- Generate listing showing the contents of the dispatch table
1526 if Debug_Flag_ZZ
then
1531 -- Non-tagged type, scan forward to locate
1532 -- inherited hidden operations.
1534 Prim_Op
:= Next_Entity
(E
);
1535 while Present
(Prim_Op
) loop
1536 if Is_Subprogram
(Prim_Op
)
1537 and then Present
(Alias
(Prim_Op
))
1538 and then not Comes_From_Source
(Prim_Op
)
1539 and then Is_Internal_Name
(Chars
(Prim_Op
))
1540 and then not Is_Internal_Name
(Chars
(Alias
(Prim_Op
)))
1541 and then Is_Primitive_Of
(E
, Prim_Op
)
1543 Derive_Subprogram
(New_Op
, Alias
(Prim_Op
), E
, Etype
(E
));
1546 Next_Entity
(Prim_Op
);
1553 end Declare_Inherited_Private_Subprograms
;
1555 -----------------------
1556 -- End_Package_Scope --
1557 -----------------------
1559 procedure End_Package_Scope
(P
: Entity_Id
) is
1561 Uninstall_Declarations
(P
);
1563 end End_Package_Scope
;
1565 ---------------------------
1566 -- Exchange_Declarations --
1567 ---------------------------
1569 procedure Exchange_Declarations
(Id
: Entity_Id
) is
1570 Full_Id
: constant Entity_Id
:= Full_View
(Id
);
1571 H1
: constant Entity_Id
:= Homonym
(Id
);
1572 Next1
: constant Entity_Id
:= Next_Entity
(Id
);
1577 -- If missing full declaration for type, nothing to exchange
1579 if No
(Full_Id
) then
1583 -- Otherwise complete the exchange, and preserve semantic links
1585 Next2
:= Next_Entity
(Full_Id
);
1586 H2
:= Homonym
(Full_Id
);
1588 -- Reset full declaration pointer to reflect the switched entities
1589 -- and readjust the next entity chains.
1591 Exchange_Entities
(Id
, Full_Id
);
1593 Set_Next_Entity
(Id
, Next1
);
1594 Set_Homonym
(Id
, H1
);
1596 Set_Full_View
(Full_Id
, Id
);
1597 Set_Next_Entity
(Full_Id
, Next2
);
1598 Set_Homonym
(Full_Id
, H2
);
1599 end Exchange_Declarations
;
1601 ----------------------------
1602 -- Install_Package_Entity --
1603 ----------------------------
1605 procedure Install_Package_Entity
(Id
: Entity_Id
) is
1607 if not Is_Internal
(Id
) then
1608 if Debug_Flag_E
then
1609 Write_Str
("Install: ");
1610 Write_Name
(Chars
(Id
));
1614 if not Is_Child_Unit
(Id
) then
1615 Set_Is_Immediately_Visible
(Id
);
1619 end Install_Package_Entity
;
1621 ----------------------------------
1622 -- Install_Private_Declarations --
1623 ----------------------------------
1625 procedure Install_Private_Declarations
(P
: Entity_Id
) is
1627 Priv_Elmt
: Elmt_Id
;
1632 -- First exchange declarations for private types, so that the
1633 -- full declaration is visible. For each private type, we check
1634 -- its Private_Dependents list and also exchange any subtypes of
1635 -- or derived types from it. Finally, if this is a Taft amendment
1636 -- type, the incomplete declaration is irrelevant, and we want to
1637 -- link the eventual full declaration with the original private
1638 -- one so we also skip the exchange.
1640 Id
:= First_Entity
(P
);
1641 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
1642 if Is_Private_Base_Type
(Id
)
1643 and then Comes_From_Source
(Full_View
(Id
))
1644 and then Present
(Full_View
(Id
))
1645 and then Scope
(Full_View
(Id
)) = Scope
(Id
)
1646 and then Ekind
(Full_View
(Id
)) /= E_Incomplete_Type
1648 -- If there is a use-type clause on the private type, set the
1649 -- full view accordingly.
1651 Set_In_Use
(Full_View
(Id
), In_Use
(Id
));
1652 Full
:= Full_View
(Id
);
1654 if Is_Private_Base_Type
(Full
)
1655 and then Has_Private_Declaration
(Full
)
1656 and then Nkind
(Parent
(Full
)) = N_Full_Type_Declaration
1657 and then In_Open_Scopes
(Scope
(Etype
(Full
)))
1658 and then In_Package_Body
(Current_Scope
)
1659 and then not Is_Private_Type
(Etype
(Full
))
1661 -- This is the completion of a private type by a derivation
1662 -- from another private type which is not private anymore. This
1663 -- can only happen in a package nested within a child package,
1664 -- when the parent type is defined in the parent unit. At this
1665 -- point the current type is not private either, and we have to
1666 -- install the underlying full view, which is now visible.
1667 -- Save the current full view as well, so that all views can
1668 -- be restored on exit. It may seem that after compiling the
1669 -- child body there are not environments to restore, but the
1670 -- back-end expects those links to be valid, and freeze nodes
1673 if No
(Full_View
(Full
))
1674 and then Present
(Underlying_Full_View
(Full
))
1676 Set_Full_View
(Id
, Underlying_Full_View
(Full
));
1677 Set_Underlying_Full_View
(Id
, Full
);
1679 Set_Underlying_Full_View
(Full
, Empty
);
1680 Set_Is_Frozen
(Full_View
(Id
));
1684 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
1686 Exchange_Declarations
(Id
);
1687 Set_Is_Immediately_Visible
(Id
);
1689 while Present
(Priv_Elmt
) loop
1690 Priv
:= Node
(Priv_Elmt
);
1692 -- Before the exchange, verify that the presence of the
1693 -- Full_View field. It will be empty if the entity
1694 -- has already been installed due to a previous call.
1696 if Present
(Full_View
(Priv
))
1697 and then Is_Visible_Dependent
(Priv
)
1700 -- For each subtype that is swapped, we also swap the
1701 -- reference to it in Private_Dependents, to allow access
1702 -- to it when we swap them out in End_Package_Scope.
1704 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv
));
1705 Exchange_Declarations
(Priv
);
1706 Set_Is_Immediately_Visible
1707 (Priv
, In_Open_Scopes
(Scope
(Priv
)));
1708 Set_Is_Potentially_Use_Visible
1709 (Priv
, Is_Potentially_Use_Visible
(Node
(Priv_Elmt
)));
1712 Next_Elmt
(Priv_Elmt
);
1719 -- Next make other declarations in the private part visible as well
1721 Id
:= First_Private_Entity
(P
);
1722 while Present
(Id
) loop
1723 Install_Package_Entity
(Id
);
1724 Set_Is_Hidden
(Id
, False);
1728 -- Indicate that the private part is currently visible, so it can be
1729 -- properly reset on exit.
1731 Set_In_Private_Part
(P
);
1732 end Install_Private_Declarations
;
1734 ----------------------------------
1735 -- Install_Visible_Declarations --
1736 ----------------------------------
1738 procedure Install_Visible_Declarations
(P
: Entity_Id
) is
1740 Last_Entity
: Entity_Id
;
1744 (Is_Package_Or_Generic_Package
(P
) or else Is_Record_Type
(P
));
1746 if Is_Package_Or_Generic_Package
(P
) then
1747 Last_Entity
:= First_Private_Entity
(P
);
1749 Last_Entity
:= Empty
;
1752 Id
:= First_Entity
(P
);
1753 while Present
(Id
) and then Id
/= Last_Entity
loop
1754 Install_Package_Entity
(Id
);
1757 end Install_Visible_Declarations
;
1759 --------------------------
1760 -- Is_Private_Base_Type --
1761 --------------------------
1763 function Is_Private_Base_Type
(E
: Entity_Id
) return Boolean is
1765 return Ekind
(E
) = E_Private_Type
1766 or else Ekind
(E
) = E_Limited_Private_Type
1767 or else Ekind
(E
) = E_Record_Type_With_Private
;
1768 end Is_Private_Base_Type
;
1770 --------------------------
1771 -- Is_Visible_Dependent --
1772 --------------------------
1774 function Is_Visible_Dependent
(Dep
: Entity_Id
) return Boolean
1776 S
: constant Entity_Id
:= Scope
(Dep
);
1779 -- Renamings created for actual types have the visibility of the
1782 if Ekind
(S
) = E_Package
1783 and then Is_Generic_Instance
(S
)
1784 and then (Is_Generic_Actual_Type
(Dep
)
1785 or else Is_Generic_Actual_Type
(Full_View
(Dep
)))
1789 elsif not (Is_Derived_Type
(Dep
))
1790 and then Is_Derived_Type
(Full_View
(Dep
))
1792 -- When instantiating a package body, the scope stack is empty,
1793 -- so check instead whether the dependent type is defined in
1794 -- the same scope as the instance itself.
1796 return In_Open_Scopes
(S
)
1797 or else (Is_Generic_Instance
(Current_Scope
)
1798 and then Scope
(Dep
) = Scope
(Current_Scope
));
1802 end Is_Visible_Dependent
;
1804 ----------------------------
1805 -- May_Need_Implicit_Body --
1806 ----------------------------
1808 procedure May_Need_Implicit_Body
(E
: Entity_Id
) is
1809 P
: constant Node_Id
:= Unit_Declaration_Node
(E
);
1810 S
: constant Node_Id
:= Parent
(P
);
1815 if not Has_Completion
(E
)
1816 and then Nkind
(P
) = N_Package_Declaration
1817 and then (Present
(Activation_Chain_Entity
(P
)) or else Has_RACW
(E
))
1820 Make_Package_Body
(Sloc
(E
),
1821 Defining_Unit_Name
=> Make_Defining_Identifier
(Sloc
(E
),
1822 Chars
=> Chars
(E
)),
1823 Declarations
=> New_List
);
1825 if Nkind
(S
) = N_Package_Specification
then
1826 if Present
(Private_Declarations
(S
)) then
1827 Decls
:= Private_Declarations
(S
);
1829 Decls
:= Visible_Declarations
(S
);
1832 Decls
:= Declarations
(S
);
1838 end May_Need_Implicit_Body
;
1840 ----------------------
1841 -- New_Private_Type --
1842 ----------------------
1844 procedure New_Private_Type
(N
: Node_Id
; Id
: Entity_Id
; Def
: Node_Id
) is
1848 if Limited_Present
(Def
) then
1849 Set_Ekind
(Id
, E_Limited_Private_Type
);
1851 Set_Ekind
(Id
, E_Private_Type
);
1855 Set_Has_Delayed_Freeze
(Id
);
1856 Set_Is_First_Subtype
(Id
);
1857 Init_Size_Align
(Id
);
1859 Set_Is_Constrained
(Id
,
1860 No
(Discriminant_Specifications
(N
))
1861 and then not Unknown_Discriminants_Present
(N
));
1863 -- Set tagged flag before processing discriminants, to catch
1866 Set_Is_Tagged_Type
(Id
, Tagged_Present
(Def
));
1868 Set_Discriminant_Constraint
(Id
, No_Elist
);
1869 Set_Stored_Constraint
(Id
, No_Elist
);
1871 if Present
(Discriminant_Specifications
(N
)) then
1873 Process_Discriminants
(N
);
1876 elsif Unknown_Discriminants_Present
(N
) then
1877 Set_Has_Unknown_Discriminants
(Id
);
1880 Set_Private_Dependents
(Id
, New_Elmt_List
);
1882 if Tagged_Present
(Def
) then
1883 Set_Ekind
(Id
, E_Record_Type_With_Private
);
1884 Make_Class_Wide_Type
(Id
);
1885 Set_Primitive_Operations
(Id
, New_Elmt_List
);
1886 Set_Is_Abstract_Type
(Id
, Abstract_Present
(Def
));
1887 Set_Is_Limited_Record
(Id
, Limited_Present
(Def
));
1888 Set_Has_Delayed_Freeze
(Id
, True);
1890 elsif Abstract_Present
(Def
) then
1891 Error_Msg_N
("only a tagged type can be abstract", N
);
1893 end New_Private_Type
;
1895 ----------------------------
1896 -- Uninstall_Declarations --
1897 ----------------------------
1899 procedure Uninstall_Declarations
(P
: Entity_Id
) is
1900 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
1903 Priv_Elmt
: Elmt_Id
;
1904 Priv_Sub
: Entity_Id
;
1906 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
);
1907 -- Copy to the private declaration the attributes of the full view
1908 -- that need to be available for the partial view also.
1910 function Type_In_Use
(T
: Entity_Id
) return Boolean;
1911 -- Check whether type or base type appear in an active use_type clause
1913 ------------------------------
1914 -- Preserve_Full_Attributes --
1915 ------------------------------
1917 procedure Preserve_Full_Attributes
(Priv
, Full
: Entity_Id
) is
1918 Priv_Is_Base_Type
: constant Boolean := Priv
= Base_Type
(Priv
);
1921 Set_Size_Info
(Priv
, (Full
));
1922 Set_RM_Size
(Priv
, RM_Size
(Full
));
1923 Set_Size_Known_At_Compile_Time
1924 (Priv
, Size_Known_At_Compile_Time
(Full
));
1925 Set_Is_Volatile
(Priv
, Is_Volatile
(Full
));
1926 Set_Treat_As_Volatile
(Priv
, Treat_As_Volatile
(Full
));
1927 Set_Is_Ada_2005_Only
(Priv
, Is_Ada_2005_Only
(Full
));
1928 Set_Has_Pragma_Unreferenced
(Priv
, Has_Pragma_Unreferenced
(Full
));
1929 Set_Has_Pragma_Unreferenced_Objects
1930 (Priv
, Has_Pragma_Unreferenced_Objects
1932 if Is_Unchecked_Union
(Full
) then
1933 Set_Is_Unchecked_Union
(Base_Type
(Priv
));
1935 -- Why is atomic not copied here ???
1937 if Referenced
(Full
) then
1938 Set_Referenced
(Priv
);
1941 if Priv_Is_Base_Type
then
1942 Set_Is_Controlled
(Priv
, Is_Controlled
(Base_Type
(Full
)));
1943 Set_Finalize_Storage_Only
(Priv
, Finalize_Storage_Only
1944 (Base_Type
(Full
)));
1945 Set_Has_Task
(Priv
, Has_Task
(Base_Type
(Full
)));
1946 Set_Has_Controlled_Component
(Priv
, Has_Controlled_Component
1947 (Base_Type
(Full
)));
1950 Set_Freeze_Node
(Priv
, Freeze_Node
(Full
));
1952 if Is_Tagged_Type
(Priv
)
1953 and then Is_Tagged_Type
(Full
)
1954 and then not Error_Posted
(Full
)
1956 if Priv_Is_Base_Type
then
1958 -- Ada 2005 (AI-345): The full view of a type implementing
1959 -- an interface can be a task type.
1961 -- type T is new I with private;
1963 -- task type T is new I with ...
1965 if Is_Interface
(Etype
(Priv
))
1966 and then Is_Concurrent_Type
(Base_Type
(Full
))
1968 -- Protect the frontend against previous errors
1970 if Present
(Corresponding_Record_Type
1973 Set_Access_Disp_Table
1974 (Priv
, Access_Disp_Table
1975 (Corresponding_Record_Type
(Base_Type
(Full
))));
1977 -- Generic context, or previous errors
1984 Set_Access_Disp_Table
1985 (Priv
, Access_Disp_Table
(Base_Type
(Full
)));
1989 if Is_Tagged_Type
(Priv
) then
1991 -- If the type is tagged, the tag itself must be available
1992 -- on the partial view, for expansion purposes.
1994 Set_First_Entity
(Priv
, First_Entity
(Full
));
1996 -- If there are discriminants in the partial view, these remain
1997 -- visible. Otherwise only the tag itself is visible, and there
1998 -- are no nameable components in the partial view.
2000 if No
(Last_Entity
(Priv
)) then
2001 Set_Last_Entity
(Priv
, First_Entity
(Priv
));
2005 Set_Has_Discriminants
(Priv
, Has_Discriminants
(Full
));
2007 end Preserve_Full_Attributes
;
2013 function Type_In_Use
(T
: Entity_Id
) return Boolean is
2015 return Scope
(Base_Type
(T
)) = P
2016 and then (In_Use
(T
) or else In_Use
(Base_Type
(T
)));
2019 -- Start of processing for Uninstall_Declarations
2022 Id
:= First_Entity
(P
);
2023 while Present
(Id
) and then Id
/= First_Private_Entity
(P
) loop
2024 if Debug_Flag_E
then
2025 Write_Str
("unlinking visible entity ");
2026 Write_Int
(Int
(Id
));
2030 -- On exit from the package scope, we must preserve the visibility
2031 -- established by use clauses in the current scope. Two cases:
2033 -- a) If the entity is an operator, it may be a primitive operator of
2034 -- a type for which there is a visible use-type clause.
2036 -- b) for other entities, their use-visibility is determined by a
2037 -- visible use clause for the package itself. For a generic instance,
2038 -- the instantiation of the formals appears in the visible part,
2039 -- but the formals are private and remain so.
2041 if Ekind
(Id
) = E_Function
2042 and then Is_Operator_Symbol_Name
(Chars
(Id
))
2043 and then not Is_Hidden
(Id
)
2044 and then not Error_Posted
(Id
)
2046 Set_Is_Potentially_Use_Visible
(Id
,
2048 or else Type_In_Use
(Etype
(Id
))
2049 or else Type_In_Use
(Etype
(First_Formal
(Id
)))
2050 or else (Present
(Next_Formal
(First_Formal
(Id
)))
2053 (Etype
(Next_Formal
(First_Formal
(Id
))))));
2055 if In_Use
(P
) and then not Is_Hidden
(Id
) then
2057 -- A child unit of a use-visible package remains use-visible
2058 -- only if it is itself a visible child unit. Otherwise it
2059 -- would remain visible in other contexts where P is use-
2060 -- visible, because once compiled it stays in the entity list
2061 -- of its parent unit.
2063 if Is_Child_Unit
(Id
) then
2064 Set_Is_Potentially_Use_Visible
(Id
,
2065 Is_Visible_Child_Unit
(Id
));
2067 Set_Is_Potentially_Use_Visible
(Id
);
2071 Set_Is_Potentially_Use_Visible
(Id
, False);
2075 -- Local entities are not immediately visible outside of the package
2077 Set_Is_Immediately_Visible
(Id
, False);
2079 -- If this is a private type with a full view (for example a local
2080 -- subtype of a private type declared elsewhere), ensure that the
2081 -- full view is also removed from visibility: it may be exposed when
2082 -- swapping views in an instantiation.
2085 and then Present
(Full_View
(Id
))
2087 Set_Is_Immediately_Visible
(Full_View
(Id
), False);
2090 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2091 Check_Abstract_Overriding
(Id
);
2092 Check_Conventions
(Id
);
2095 if (Ekind
(Id
) = E_Private_Type
2096 or else Ekind
(Id
) = E_Limited_Private_Type
)
2097 and then No
(Full_View
(Id
))
2098 and then not Is_Generic_Type
(Id
)
2099 and then not Is_Derived_Type
(Id
)
2101 Error_Msg_N
("missing full declaration for private type&", Id
);
2103 elsif Ekind
(Id
) = E_Record_Type_With_Private
2104 and then not Is_Generic_Type
(Id
)
2105 and then No
(Full_View
(Id
))
2107 if Nkind
(Parent
(Id
)) = N_Private_Type_Declaration
then
2108 Error_Msg_N
("missing full declaration for private type&", Id
);
2111 ("missing full declaration for private extension", Id
);
2114 elsif Ekind
(Id
) = E_Constant
2115 and then No
(Constant_Value
(Id
))
2116 and then No
(Full_View
(Id
))
2117 and then not Is_Imported
(Id
)
2118 and then (Nkind
(Parent
(Id
)) /= N_Object_Declaration
2119 or else not No_Initialization
(Parent
(Id
)))
2121 if not Has_Private_Declaration
(Etype
(Id
)) then
2123 -- We assume that the user did not not intend a deferred
2124 -- constant declaration, and the expression is just missing.
2127 ("constant declaration requires initialization expression",
2130 if Is_Limited_Type
(Etype
(Id
)) then
2132 ("\if variable intended, remove CONSTANT from declaration",
2138 ("missing full declaration for deferred constant (RM 7.4)",
2141 if Is_Limited_Type
(Etype
(Id
)) then
2143 ("\if variable intended, remove CONSTANT from declaration",
2152 -- If the specification was installed as the parent of a public child
2153 -- unit, the private declarations were not installed, and there is
2156 if not In_Private_Part
(P
) then
2159 Set_In_Private_Part
(P
, False);
2162 -- Make private entities invisible and exchange full and private
2163 -- declarations for private types. Id is now the first private
2164 -- entity in the package.
2166 while Present
(Id
) loop
2167 if Debug_Flag_E
then
2168 Write_Str
("unlinking private entity ");
2169 Write_Int
(Int
(Id
));
2173 if Is_Tagged_Type
(Id
) and then Ekind
(Id
) = E_Record_Type
then
2174 Check_Abstract_Overriding
(Id
);
2175 Check_Conventions
(Id
);
2178 Set_Is_Immediately_Visible
(Id
, False);
2180 if Is_Private_Base_Type
(Id
)
2181 and then Present
(Full_View
(Id
))
2183 Full
:= Full_View
(Id
);
2185 -- If the partial view is not declared in the visible part
2186 -- of the package (as is the case when it is a type derived
2187 -- from some other private type in the private part of the
2188 -- current package), no exchange takes place.
2191 or else List_Containing
(Parent
(Id
))
2192 /= Visible_Declarations
(Specification
(Decl
))
2197 -- The entry in the private part points to the full declaration,
2198 -- which is currently visible. Exchange them so only the private
2199 -- type declaration remains accessible, and link private and
2200 -- full declaration in the opposite direction. Before the actual
2201 -- exchange, we copy back attributes of the full view that
2202 -- must be available to the partial view too.
2204 Preserve_Full_Attributes
(Id
, Full
);
2206 Set_Is_Potentially_Use_Visible
(Id
, In_Use
(P
));
2208 if Is_Indefinite_Subtype
(Full
)
2209 and then not Is_Indefinite_Subtype
(Id
)
2212 ("full view of type must be definite subtype", Full
);
2215 Priv_Elmt
:= First_Elmt
(Private_Dependents
(Id
));
2217 -- Swap out the subtypes and derived types of Id that were
2218 -- compiled in this scope, or installed previously by
2219 -- Install_Private_Declarations.
2220 -- Before we do the swap, we verify the presence of the
2221 -- Full_View field which may be empty due to a swap by
2222 -- a previous call to End_Package_Scope (e.g. from the
2223 -- freezing mechanism).
2225 while Present
(Priv_Elmt
) loop
2226 Priv_Sub
:= Node
(Priv_Elmt
);
2228 if Present
(Full_View
(Priv_Sub
)) then
2230 if Scope
(Priv_Sub
) = P
2231 or else not In_Open_Scopes
(Scope
(Priv_Sub
))
2233 Set_Is_Immediately_Visible
(Priv_Sub
, False);
2236 if Is_Visible_Dependent
(Priv_Sub
) then
2237 Preserve_Full_Attributes
2238 (Priv_Sub
, Full_View
(Priv_Sub
));
2239 Replace_Elmt
(Priv_Elmt
, Full_View
(Priv_Sub
));
2240 Exchange_Declarations
(Priv_Sub
);
2244 Next_Elmt
(Priv_Elmt
);
2247 -- Now restore the type itself to its private view
2249 Exchange_Declarations
(Id
);
2251 -- If we have installed an underlying full view for a type
2252 -- derived from a private type in a child unit, restore the
2253 -- proper views of private and full view. See corresponding
2254 -- code in Install_Private_Declarations.
2255 -- After the exchange, Full denotes the private type in the
2256 -- visible part of the package.
2258 if Is_Private_Base_Type
(Full
)
2259 and then Present
(Full_View
(Full
))
2260 and then Present
(Underlying_Full_View
(Full
))
2261 and then In_Package_Body
(Current_Scope
)
2263 Set_Full_View
(Full
, Underlying_Full_View
(Full
));
2264 Set_Underlying_Full_View
(Full
, Empty
);
2267 elsif Ekind
(Id
) = E_Incomplete_Type
2268 and then No
(Full_View
(Id
))
2270 -- Mark Taft amendment types
2272 Set_Has_Completion_In_Body
(Id
);
2274 elsif not Is_Child_Unit
(Id
)
2275 and then (not Is_Private_Type
(Id
)
2276 or else No
(Full_View
(Id
)))
2279 Set_Is_Potentially_Use_Visible
(Id
, False);
2285 end Uninstall_Declarations
;
2287 ------------------------
2288 -- Unit_Requires_Body --
2289 ------------------------
2291 function Unit_Requires_Body
(P
: Entity_Id
) return Boolean is
2295 -- Imported entity never requires body. Right now, only
2296 -- subprograms can be imported, but perhaps in the future
2297 -- we will allow import of packages.
2299 if Is_Imported
(P
) then
2302 -- Body required if library package with pragma Elaborate_Body
2304 elsif Has_Pragma_Elaborate_Body
(P
) then
2307 -- Body required if subprogram
2309 elsif Is_Subprogram
(P
) or else Is_Generic_Subprogram
(P
) then
2312 -- Treat a block as requiring a body
2314 elsif Ekind
(P
) = E_Block
then
2317 elsif Ekind
(P
) = E_Package
2318 and then Nkind
(Parent
(P
)) = N_Package_Specification
2319 and then Present
(Generic_Parent
(Parent
(P
)))
2322 G_P
: constant Entity_Id
:= Generic_Parent
(Parent
(P
));
2324 if Has_Pragma_Elaborate_Body
(G_P
) then
2330 -- Otherwise search entity chain for entity requiring completion
2332 E
:= First_Entity
(P
);
2333 while Present
(E
) loop
2335 -- Always ignore child units. Child units get added to the entity
2336 -- list of a parent unit, but are not original entities of the
2337 -- parent, and so do not affect whether the parent needs a body.
2339 if Is_Child_Unit
(E
) then
2342 -- Ignore formal packages and their renamings
2344 elsif Ekind
(E
) = E_Package
2345 and then Nkind
(Original_Node
(Unit_Declaration_Node
(E
))) =
2346 N_Formal_Package_Declaration
2350 -- Otherwise test to see if entity requires a completion.
2351 -- Note that subprogram entities whose declaration does not come
2352 -- from source are ignored here on the basis that we assume the
2353 -- expander will provide an implicit completion at some point.
2355 elsif (Is_Overloadable
(E
)
2356 and then Ekind
(E
) /= E_Enumeration_Literal
2357 and then Ekind
(E
) /= E_Operator
2358 and then not Is_Abstract_Subprogram
(E
)
2359 and then not Has_Completion
(E
)
2360 and then Comes_From_Source
(Parent
(E
)))
2363 (Ekind
(E
) = E_Package
2365 and then not Has_Completion
(E
)
2366 and then Unit_Requires_Body
(E
))
2369 (Ekind
(E
) = E_Incomplete_Type
and then No
(Full_View
(E
)))
2372 ((Ekind
(E
) = E_Task_Type
or else
2373 Ekind
(E
) = E_Protected_Type
)
2374 and then not Has_Completion
(E
))
2377 (Ekind
(E
) = E_Generic_Package
and then E
/= P
2378 and then not Has_Completion
(E
)
2379 and then Unit_Requires_Body
(E
))
2382 (Is_Generic_Subprogram
(E
)
2383 and then not Has_Completion
(E
))
2388 -- Entity that does not require completion
2398 end Unit_Requires_Body
;