1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2011, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 -- This package contains the routines to process package specifications and
27 -- bodies. The most important semantic aspects of package processing are the
28 -- handling of private and full declarations, and the construction of dispatch
29 -- tables for tagged types.
31 with Atree; use Atree;
32 with Debug; use Debug;
33 with Einfo; use Einfo;
34 with Elists; use Elists;
35 with Errout; use Errout;
36 with Exp_Disp; use Exp_Disp;
37 with Exp_Dist; use Exp_Dist;
38 with Exp_Dbug; use Exp_Dbug;
40 with Lib.Xref; use Lib.Xref;
41 with Namet; use Namet;
42 with Nmake; use Nmake;
43 with Nlists; use Nlists;
45 with Output; use Output;
46 with Restrict; use Restrict;
48 with Sem_Aux; use Sem_Aux;
49 with Sem_Cat; use Sem_Cat;
50 with Sem_Ch3; use Sem_Ch3;
51 with Sem_Ch6; use Sem_Ch6;
52 with Sem_Ch8; use Sem_Ch8;
53 with Sem_Ch10; use Sem_Ch10;
54 with Sem_Ch12; use Sem_Ch12;
55 with Sem_Ch13; use Sem_Ch13;
56 with Sem_Disp; use Sem_Disp;
57 with Sem_Eval; use Sem_Eval;
58 with Sem_Util; use Sem_Util;
59 with Sem_Warn; use Sem_Warn;
60 with Snames; use Snames;
61 with Stand; use Stand;
62 with Sinfo; use Sinfo;
63 with Sinput; use Sinput;
65 with Uintp; use Uintp;
67 package body Sem_Ch7 is
69 -----------------------------------
70 -- Handling private declarations --
71 -----------------------------------
73 -- The principle that each entity has a single defining occurrence clashes
74 -- with the presence of two separate definitions for private types: the
75 -- first is the private type declaration, and the second is the full type
76 -- declaration. It is important that all references to the type point to
77 -- the same defining occurrence, namely the first one. To enforce the two
78 -- separate views of the entity, the corresponding information is swapped
79 -- between the two declarations. Outside of the package, the defining
80 -- occurrence only contains the private declaration information, while in
81 -- the private part and the body of the package the defining occurrence
82 -- contains the full declaration. To simplify the swap, the defining
83 -- occurrence that currently holds the private declaration points to the
84 -- full declaration. During semantic processing the defining occurrence
85 -- also points to a list of private dependents, that is to say access types
86 -- or composite types whose designated types or component types are
87 -- subtypes or derived types of the private type in question. After the
88 -- full declaration has been seen, the private dependents are updated to
89 -- indicate that they have full definitions.
91 -----------------------
92 -- Local Subprograms --
93 -----------------------
95 procedure Analyze_Package_Body_Helper (N : Node_Id);
96 -- Does all the real work of Analyze_Package_Body
98 procedure Check_Anonymous_Access_Types
101 -- If the spec of a package has a limited_with_clause, it may declare
102 -- anonymous access types whose designated type is a limited view, such an
103 -- anonymous access return type for a function. This access type cannot be
104 -- elaborated in the spec itself, but it may need an itype reference if it
105 -- is used within a nested scope. In that case the itype reference is
106 -- created at the beginning of the corresponding package body and inserted
107 -- before other body declarations.
109 procedure Install_Package_Entity (Id : Entity_Id);
110 -- Supporting procedure for Install_{Visible,Private}_Declarations. Places
111 -- one entity on its visibility chain, and recurses on the visible part if
112 -- the entity is an inner package.
114 function Is_Private_Base_Type (E : Entity_Id) return Boolean;
115 -- True for a private type that is not a subtype
117 function Is_Visible_Dependent (Dep : Entity_Id) return Boolean;
118 -- If the private dependent is a private type whose full view is derived
119 -- from the parent type, its full properties are revealed only if we are in
120 -- the immediate scope of the private dependent. Should this predicate be
121 -- tightened further???
123 procedure Declare_Inherited_Private_Subprograms (Id : Entity_Id);
124 -- Called upon entering the private part of a public child package and the
125 -- body of a nested package, to potentially declare certain inherited
126 -- subprograms that were inherited by types in the visible part, but whose
127 -- declaration was deferred because the parent operation was private and
128 -- not visible at that point. These subprograms are located by traversing
129 -- the visible part declarations looking for non-private type extensions
130 -- and then examining each of the primitive operations of such types to
131 -- find those that were inherited but declared with a special internal
132 -- name. Each such operation is now declared as an operation with a normal
133 -- name (using the name of the parent operation) and replaces the previous
134 -- implicit operation in the primitive operations list of the type. If the
135 -- inherited private operation has been overridden, then it's replaced by
136 -- the overriding operation.
138 --------------------------
139 -- Analyze_Package_Body --
140 --------------------------
142 procedure Analyze_Package_Body (N : Node_Id) is
143 Loc : constant Source_Ptr := Sloc (N);
147 Write_Str ("==> package body ");
148 Write_Name (Chars (Defining_Entity (N)));
149 Write_Str (" from ");
150 Write_Location (Loc);
155 -- The real work is split out into the helper, so it can do "return;"
156 -- without skipping the debug output.
158 Analyze_Package_Body_Helper (N);
162 Write_Str ("<== package body ");
163 Write_Name (Chars (Defining_Entity (N)));
164 Write_Str (" from ");
165 Write_Location (Loc);
168 end Analyze_Package_Body;
170 ---------------------------------
171 -- Analyze_Package_Body_Helper --
172 ---------------------------------
174 procedure Analyze_Package_Body_Helper (N : Node_Id) is
178 Last_Spec_Entity : Entity_Id;
182 procedure Install_Composite_Operations (P : Entity_Id);
183 -- Composite types declared in the current scope may depend on types
184 -- that were private at the point of declaration, and whose full view
185 -- is now in scope. Indicate that the corresponding operations on the
186 -- composite type are available.
188 ----------------------------------
189 -- Install_Composite_Operations --
190 ----------------------------------
192 procedure Install_Composite_Operations (P : Entity_Id) is
196 Id := First_Entity (P);
197 while Present (Id) loop
199 and then (Is_Limited_Composite (Id)
200 or else Is_Private_Composite (Id))
201 and then No (Private_Component (Id))
203 Set_Is_Limited_Composite (Id, False);
204 Set_Is_Private_Composite (Id, False);
209 end Install_Composite_Operations;
211 -- Start of processing for Analyze_Package_Body_Helper
214 -- Find corresponding package specification, and establish the current
215 -- scope. The visible defining entity for the package is the defining
216 -- occurrence in the spec. On exit from the package body, all body
217 -- declarations are attached to the defining entity for the body, but
218 -- the later is never used for name resolution. In this fashion there
219 -- is only one visible entity that denotes the package.
221 -- Set Body_Id. Note that this Will be reset to point to the generic
222 -- copy later on in the generic case.
224 Body_Id := Defining_Entity (N);
226 if Present (Corresponding_Spec (N)) then
228 -- Body is body of package instantiation. Corresponding spec has
231 Spec_Id := Corresponding_Spec (N);
232 Pack_Decl := Unit_Declaration_Node (Spec_Id);
235 Spec_Id := Current_Entity_In_Scope (Defining_Entity (N));
238 and then Is_Package_Or_Generic_Package (Spec_Id)
240 Pack_Decl := Unit_Declaration_Node (Spec_Id);
242 if Nkind (Pack_Decl) = N_Package_Renaming_Declaration then
243 Error_Msg_N ("cannot supply body for package renaming", N);
246 elsif Present (Corresponding_Body (Pack_Decl)) then
247 Error_Msg_N ("redefinition of package body", N);
252 Error_Msg_N ("missing specification for package body", N);
256 if Is_Package_Or_Generic_Package (Spec_Id)
257 and then (Scope (Spec_Id) = Standard_Standard
258 or else Is_Child_Unit (Spec_Id))
259 and then not Unit_Requires_Body (Spec_Id)
261 if Ada_Version = Ada_83 then
263 ("optional package body (not allowed in Ada 95)?", N);
265 Error_Msg_N ("spec of this package does not allow a body", N);
270 Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id));
271 Style.Check_Identifier (Body_Id, Spec_Id);
273 if Is_Child_Unit (Spec_Id) then
274 if Nkind (Parent (N)) /= N_Compilation_Unit then
276 ("body of child unit& cannot be an inner package", N, Spec_Id);
279 Set_Is_Child_Unit (Body_Id);
282 -- Generic package case
284 if Ekind (Spec_Id) = E_Generic_Package then
286 -- Disable expansion and perform semantic analysis on copy. The
287 -- unannotated body will be used in all instantiations.
289 Body_Id := Defining_Entity (N);
290 Set_Ekind (Body_Id, E_Package_Body);
291 Set_Scope (Body_Id, Scope (Spec_Id));
292 Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id));
293 Set_Body_Entity (Spec_Id, Body_Id);
294 Set_Spec_Entity (Body_Id, Spec_Id);
296 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
299 -- Update Body_Id to point to the copied node for the remainder of
302 Body_Id := Defining_Entity (N);
306 -- The Body_Id is that of the copied node in the generic case, the
307 -- current node otherwise. Note that N was rewritten above, so we must
308 -- be sure to get the latest Body_Id value.
310 Set_Ekind (Body_Id, E_Package_Body);
311 Set_Body_Entity (Spec_Id, Body_Id);
312 Set_Spec_Entity (Body_Id, Spec_Id);
314 -- Defining name for the package body is not a visible entity: Only the
315 -- defining name for the declaration is visible.
317 Set_Etype (Body_Id, Standard_Void_Type);
318 Set_Scope (Body_Id, Scope (Spec_Id));
319 Set_Corresponding_Spec (N, Spec_Id);
320 Set_Corresponding_Body (Pack_Decl, Body_Id);
322 -- The body entity is not used for semantics or code generation, but
323 -- it is attached to the entity list of the enclosing scope to simplify
324 -- the listing of back-annotations for the types it main contain.
326 if Scope (Spec_Id) /= Standard_Standard then
327 Append_Entity (Body_Id, Scope (Spec_Id));
330 -- Indicate that we are currently compiling the body of the package
332 Set_In_Package_Body (Spec_Id);
333 Set_Has_Completion (Spec_Id);
334 Last_Spec_Entity := Last_Entity (Spec_Id);
336 Push_Scope (Spec_Id);
338 Set_Categorization_From_Pragmas (N);
340 Install_Visible_Declarations (Spec_Id);
341 Install_Private_Declarations (Spec_Id);
342 Install_Private_With_Clauses (Spec_Id);
343 Install_Composite_Operations (Spec_Id);
345 Check_Anonymous_Access_Types (Spec_Id, N);
347 if Ekind (Spec_Id) = E_Generic_Package then
348 Set_Use (Generic_Formal_Declarations (Pack_Decl));
351 Set_Use (Visible_Declarations (Specification (Pack_Decl)));
352 Set_Use (Private_Declarations (Specification (Pack_Decl)));
354 -- This is a nested package, so it may be necessary to declare certain
355 -- inherited subprograms that are not yet visible because the parent
356 -- type's subprograms are now visible.
358 if Ekind (Scope (Spec_Id)) = E_Package
359 and then Scope (Spec_Id) /= Standard_Standard
361 Declare_Inherited_Private_Subprograms (Spec_Id);
364 if Present (Declarations (N)) then
365 Analyze_Declarations (Declarations (N));
366 Inspect_Deferred_Constant_Completion (Declarations (N));
369 -- Analyze_Declarations has caused freezing of all types. Now generate
370 -- bodies for RACW primitives and stream attributes, if any.
372 if Ekind (Spec_Id) = E_Package and then Has_RACW (Spec_Id) then
374 -- Attach subprogram bodies to support RACWs declared in spec
376 Append_RACW_Bodies (Declarations (N), Spec_Id);
377 Analyze_List (Declarations (N));
380 HSS := Handled_Statement_Sequence (N);
382 if Present (HSS) then
383 Process_End_Label (HSS, 't', Spec_Id);
386 -- Check that elaboration code in a preelaborable package body is
387 -- empty other than null statements and labels (RM 10.2.1(6)).
389 Validate_Null_Statement_Sequence (N);
392 Validate_Categorization_Dependency (N, Spec_Id);
393 Check_Completion (Body_Id);
395 -- Generate start of body reference. Note that we do this fairly late,
396 -- because the call will use In_Extended_Main_Source_Unit as a check,
397 -- and we want to make sure that Corresponding_Stub links are set
399 Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False);
401 -- For a generic package, collect global references and mark them on
402 -- the original body so that they are not resolved again at the point
405 if Ekind (Spec_Id) /= E_Package then
406 Save_Global_References (Original_Node (N));
410 -- The entities of the package body have so far been chained onto the
411 -- declaration chain for the spec. That's been fine while we were in the
412 -- body, since we wanted them to be visible, but now that we are leaving
413 -- the package body, they are no longer visible, so we remove them from
414 -- the entity chain of the package spec entity, and copy them to the
415 -- entity chain of the package body entity, where they will never again
418 if Present (Last_Spec_Entity) then
419 Set_First_Entity (Body_Id, Next_Entity (Last_Spec_Entity));
420 Set_Next_Entity (Last_Spec_Entity, Empty);
421 Set_Last_Entity (Body_Id, Last_Entity (Spec_Id));
422 Set_Last_Entity (Spec_Id, Last_Spec_Entity);
425 Set_First_Entity (Body_Id, First_Entity (Spec_Id));
426 Set_Last_Entity (Body_Id, Last_Entity (Spec_Id));
427 Set_First_Entity (Spec_Id, Empty);
428 Set_Last_Entity (Spec_Id, Empty);
431 End_Package_Scope (Spec_Id);
433 -- All entities declared in body are not visible
439 E := First_Entity (Body_Id);
440 while Present (E) loop
441 Set_Is_Immediately_Visible (E, False);
442 Set_Is_Potentially_Use_Visible (E, False);
445 -- Child units may appear on the entity list (e.g. if they appear
446 -- in the context of a subunit) but they are not body entities.
448 if not Is_Child_Unit (E) then
449 Set_Is_Package_Body_Entity (E);
456 Check_References (Body_Id);
458 -- For a generic unit, check that the formal parameters are referenced,
459 -- and that local variables are used, as for regular packages.
461 if Ekind (Spec_Id) = E_Generic_Package then
462 Check_References (Spec_Id);
465 -- The processing so far has made all entities of the package body
466 -- public (i.e. externally visible to the linker). This is in general
467 -- necessary, since inlined or generic bodies, for which code is
468 -- generated in other units, may need to see these entities. The
469 -- following loop runs backwards from the end of the entities of the
470 -- package body making these entities invisible until we reach a
471 -- referencer, i.e. a declaration that could reference a previous
472 -- declaration, a generic body or an inlined body, or a stub (which may
473 -- contain either of these). This is of course an approximation, but it
474 -- is conservative and definitely correct.
476 -- We only do this at the outer (library) level non-generic packages.
477 -- The reason is simply to cut down on the number of global symbols
478 -- generated, which has a double effect: (1) to make the compilation
479 -- process more efficient and (2) to give the code generator more
480 -- freedom to optimize within each unit, especially subprograms.
482 if (Scope (Spec_Id) = Standard_Standard or else Is_Child_Unit (Spec_Id))
483 and then not Is_Generic_Unit (Spec_Id)
484 and then Present (Declarations (N))
486 Make_Non_Public_Where_Possible : declare
488 function Has_Referencer
490 Outer : Boolean) return Boolean;
491 -- Traverse the given list of declarations in reverse order.
492 -- Return True if a referencer is present. Return False if none is
493 -- found. The Outer parameter is True for the outer level call and
494 -- False for inner level calls for nested packages. If Outer is
495 -- True, then any entities up to the point of hitting a referencer
496 -- get their Is_Public flag cleared, so that the entities will be
497 -- treated as static entities in the C sense, and need not have
498 -- fully qualified names. Furthermore, if the referencer is an
499 -- inlined subprogram that doesn't reference other subprograms,
500 -- we keep clearing the Is_Public flag on subprograms. For inner
501 -- levels, we need all names to be fully qualified to deal with
502 -- the same name appearing in parallel packages (right now this
503 -- is tied to their being external).
509 function Has_Referencer
511 Outer : Boolean) return Boolean
513 Has_Referencer_Except_For_Subprograms : Boolean := False;
520 function Check_Subprogram_Ref (N : Node_Id)
521 return Traverse_Result;
522 -- Look for references to subprograms
524 --------------------------
525 -- Check_Subprogram_Ref --
526 --------------------------
528 function Check_Subprogram_Ref (N : Node_Id)
529 return Traverse_Result
534 -- Check name of procedure or function calls
536 if Nkind_In (N, N_Procedure_Call_Statement, N_Function_Call)
537 and then Is_Entity_Name (Name (N))
542 -- Check prefix of attribute references
544 if Nkind (N) = N_Attribute_Reference
545 and then Is_Entity_Name (Prefix (N))
546 and then Present (Entity (Prefix (N)))
547 and then Ekind (Entity (Prefix (N))) in Subprogram_Kind
552 -- Check value of constants
554 if Nkind (N) = N_Identifier
555 and then Present (Entity (N))
556 and then Ekind (Entity (N)) = E_Constant
558 V := Constant_Value (Entity (N));
560 and then not Compile_Time_Known_Value_Or_Aggr (V)
567 end Check_Subprogram_Ref;
569 function Check_Subprogram_Refs is
570 new Traverse_Func (Check_Subprogram_Ref);
572 -- Start of processing for Has_Referencer
580 while Present (D) loop
583 if K in N_Body_Stub then
586 -- Processing for subprogram bodies
588 elsif K = N_Subprogram_Body then
589 if Acts_As_Spec (D) then
590 E := Defining_Entity (D);
592 -- An inlined body acts as a referencer. Note also
593 -- that we never reset Is_Public for an inlined
594 -- subprogram. Gigi requires Is_Public to be set.
596 -- Note that we test Has_Pragma_Inline here rather
597 -- than Is_Inlined. We are compiling this for a
598 -- client, and it is the client who will decide if
599 -- actual inlining should occur, so we need to assume
600 -- that the procedure could be inlined for the purpose
601 -- of accessing global entities.
603 if Has_Pragma_Inline (E) then
605 and then Check_Subprogram_Refs (D) = OK
607 Has_Referencer_Except_For_Subprograms := True;
612 Set_Is_Public (E, False);
616 E := Corresponding_Spec (D);
620 -- A generic subprogram body acts as a referencer
622 if Is_Generic_Unit (E) then
626 if Has_Pragma_Inline (E) or else Is_Inlined (E) then
628 and then Check_Subprogram_Refs (D) = OK
630 Has_Referencer_Except_For_Subprograms := True;
638 -- Processing for package bodies
640 elsif K = N_Package_Body
641 and then not Has_Referencer_Except_For_Subprograms
642 and then Present (Corresponding_Spec (D))
644 E := Corresponding_Spec (D);
646 -- Generic package body is a referencer. It would seem
647 -- that we only have to consider generics that can be
648 -- exported, i.e. where the corresponding spec is the
649 -- spec of the current package, but because of nested
650 -- instantiations, a fully private generic body may
651 -- export other private body entities.
653 if Is_Generic_Unit (E) then
656 -- For non-generic package body, recurse into body unless
657 -- this is an instance, we ignore instances since they
658 -- cannot have references that affect outer entities.
660 elsif not Is_Generic_Instance (E) then
662 (Declarations (D), Outer => False)
668 -- Processing for package specs, recurse into declarations.
669 -- Again we skip this for the case of generic instances.
671 elsif K = N_Package_Declaration
672 and then not Has_Referencer_Except_For_Subprograms
674 S := Specification (D);
676 if not Is_Generic_Unit (Defining_Entity (S)) then
678 (Private_Declarations (S), Outer => False)
682 (Visible_Declarations (S), Outer => False)
688 -- Objects and exceptions need not be public if we have not
689 -- encountered a referencer so far. We only reset the flag
690 -- for outer level entities that are not imported/exported,
691 -- and which have no interface name.
693 elsif Nkind_In (K, N_Object_Declaration,
694 N_Exception_Declaration,
695 N_Subprogram_Declaration)
697 E := Defining_Entity (D);
700 and then (not Has_Referencer_Except_For_Subprograms
701 or else K = N_Subprogram_Declaration)
702 and then not Is_Imported (E)
703 and then not Is_Exported (E)
704 and then No (Interface_Name (E))
706 Set_Is_Public (E, False);
713 return Has_Referencer_Except_For_Subprograms;
716 -- Start of processing for Make_Non_Public_Where_Possible
721 pragma Warnings (Off, Discard);
724 Discard := Has_Referencer (Declarations (N), Outer => True);
726 end Make_Non_Public_Where_Possible;
729 -- If expander is not active, then here is where we turn off the
730 -- In_Package_Body flag, otherwise it is turned off at the end of the
731 -- corresponding expansion routine. If this is an instance body, we need
732 -- to qualify names of local entities, because the body may have been
733 -- compiled as a preliminary to another instantiation.
735 if not Expander_Active then
736 Set_In_Package_Body (Spec_Id, False);
738 if Is_Generic_Instance (Spec_Id)
739 and then Operating_Mode = Generate_Code
741 Qualify_Entity_Names (N);
744 end Analyze_Package_Body_Helper;
746 ---------------------------------
747 -- Analyze_Package_Declaration --
748 ---------------------------------
750 procedure Analyze_Package_Declaration (N : Node_Id) is
751 Id : constant Node_Id := Defining_Entity (N);
754 -- True when in the context of a declared pure library unit
756 Body_Required : Boolean;
757 -- True when this package declaration requires a corresponding body
760 -- True when this package declaration is not a nested declaration
763 -- Analye aspect specifications immediately, since we need to recognize
764 -- things like Pure early enough to diagnose violations during analysis.
766 if Has_Aspects (N) then
767 Analyze_Aspect_Specifications (N, Id);
770 -- Ada 2005 (AI-217): Check if the package has been erroneously named
771 -- in a limited-with clause of its own context. In this case the error
772 -- has been previously notified by Analyze_Context.
774 -- limited with Pkg; -- ERROR
775 -- package Pkg is ...
777 if From_With_Type (Id) then
782 Write_Str ("==> package spec ");
783 Write_Name (Chars (Id));
784 Write_Str (" from ");
785 Write_Location (Sloc (N));
790 Generate_Definition (Id);
792 Set_Ekind (Id, E_Package);
793 Set_Etype (Id, Standard_Void_Type);
797 PF := Is_Pure (Enclosing_Lib_Unit_Entity);
798 Set_Is_Pure (Id, PF);
800 Set_Categorization_From_Pragmas (N);
802 Analyze (Specification (N));
803 Validate_Categorization_Dependency (N, Id);
805 Body_Required := Unit_Requires_Body (Id);
807 -- When this spec does not require an explicit body, we know that there
808 -- are no entities requiring completion in the language sense; we call
809 -- Check_Completion here only to ensure that any nested package
810 -- declaration that requires an implicit body gets one. (In the case
811 -- where a body is required, Check_Completion is called at the end of
812 -- the body's declarative part.)
814 if not Body_Required then
818 Comp_Unit := Nkind (Parent (N)) = N_Compilation_Unit;
821 -- Set Body_Required indication on the compilation unit node, and
822 -- determine whether elaboration warnings may be meaningful on it.
824 Set_Body_Required (Parent (N), Body_Required);
826 if not Body_Required then
827 Set_Suppress_Elaboration_Warnings (Id);
832 End_Package_Scope (Id);
834 -- For the declaration of a library unit that is a remote types package,
835 -- check legality rules regarding availability of stream attributes for
836 -- types that contain non-remote access values. This subprogram performs
837 -- visibility tests that rely on the fact that we have exited the scope
841 Validate_RT_RAT_Component (N);
846 Write_Str ("<== package spec ");
847 Write_Name (Chars (Id));
848 Write_Str (" from ");
849 Write_Location (Sloc (N));
852 end Analyze_Package_Declaration;
854 -----------------------------------
855 -- Analyze_Package_Specification --
856 -----------------------------------
858 -- Note that this code is shared for the analysis of generic package specs
859 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
861 procedure Analyze_Package_Specification (N : Node_Id) is
862 Id : constant Entity_Id := Defining_Entity (N);
863 Orig_Decl : constant Node_Id := Original_Node (Parent (N));
864 Vis_Decls : constant List_Id := Visible_Declarations (N);
865 Priv_Decls : constant List_Id := Private_Declarations (N);
868 Public_Child : Boolean;
870 Private_With_Clauses_Installed : Boolean := False;
871 -- In Ada 2005, private with_clauses are visible in the private part
872 -- of a nested package, even if it appears in the public part of the
873 -- enclosing package. This requires a separate step to install these
874 -- private_with_clauses, and remove them at the end of the nested
877 procedure Check_One_Tagged_Type_Or_Extension_At_Most;
878 -- Issue an error in SPARK mode if a package specification contains
879 -- more than one tagged type or type extension.
881 procedure Clear_Constants (Id : Entity_Id; FE : Entity_Id);
882 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
883 -- Is_True_Constant) on all variables that are entities of Id, and on
884 -- the chain whose first element is FE. A recursive call is made for all
885 -- packages and generic packages.
887 procedure Generate_Parent_References;
888 -- For a child unit, generate references to parent units, for
889 -- GPS navigation purposes.
891 function Is_Public_Child (Child, Unit : Entity_Id) return Boolean;
892 -- Child and Unit are entities of compilation units. True if Child
893 -- is a public child of Parent as defined in 10.1.1
895 procedure Inspect_Unchecked_Union_Completion (Decls : List_Id);
896 -- Detects all incomplete or private type declarations having a known
897 -- discriminant part that are completed by an Unchecked_Union. Emits
898 -- the error message "Unchecked_Union may not complete discriminated
901 procedure Install_Parent_Private_Declarations (Inst_Id : Entity_Id);
902 -- Given the package entity of a generic package instantiation or
903 -- formal package whose corresponding generic is a child unit, installs
904 -- the private declarations of each of the child unit's parents.
905 -- This has to be done at the point of entering the instance package's
906 -- private part rather than being done in Sem_Ch12.Install_Parent
907 -- (which is where the parents' visible declarations are installed).
909 ------------------------------------------------
910 -- Check_One_Tagged_Type_Or_Extension_At_Most --
911 ------------------------------------------------
913 procedure Check_One_Tagged_Type_Or_Extension_At_Most is
916 procedure Check_Decls (Decls : List_Id);
917 -- Check that either Previous is Empty and Decls does not contain
918 -- more than one tagged type or type extension, or Previous is
919 -- already set and Decls contains no tagged type or type extension.
925 procedure Check_Decls (Decls : List_Id) is
929 Decl := First (Decls);
930 while Present (Decl) loop
931 if Nkind (Decl) = N_Full_Type_Declaration
932 and then Is_Tagged_Type (Defining_Identifier (Decl))
934 if No (Previous) then
938 Error_Msg_Sloc := Sloc (Previous);
939 Check_SPARK_Restriction
940 ("at most one tagged type or type extension allowed",
941 "\\ previous declaration#",
950 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
954 Check_Decls (Vis_Decls);
956 if Present (Priv_Decls) then
957 Check_Decls (Priv_Decls);
959 end Check_One_Tagged_Type_Or_Extension_At_Most;
961 ---------------------
962 -- Clear_Constants --
963 ---------------------
965 procedure Clear_Constants (Id : Entity_Id; FE : Entity_Id) is
969 -- Ignore package renamings, not interesting and they can cause self
970 -- referential loops in the code below.
972 if Nkind (Parent (Id)) = N_Package_Renaming_Declaration then
976 -- Note: in the loop below, the check for Next_Entity pointing back
977 -- to the package entity may seem odd, but it is needed, because a
978 -- package can contain a renaming declaration to itself, and such
979 -- renamings are generated automatically within package instances.
982 while Present (E) and then E /= Id loop
983 if Is_Assignable (E) then
984 Set_Never_Set_In_Source (E, False);
985 Set_Is_True_Constant (E, False);
986 Set_Current_Value (E, Empty);
987 Set_Is_Known_Null (E, False);
988 Set_Last_Assignment (E, Empty);
990 if not Can_Never_Be_Null (E) then
991 Set_Is_Known_Non_Null (E, False);
994 elsif Is_Package_Or_Generic_Package (E) then
995 Clear_Constants (E, First_Entity (E));
996 Clear_Constants (E, First_Private_Entity (E));
1001 end Clear_Constants;
1003 --------------------------------
1004 -- Generate_Parent_References --
1005 --------------------------------
1007 procedure Generate_Parent_References is
1008 Decl : constant Node_Id := Parent (N);
1011 if Id = Cunit_Entity (Main_Unit)
1012 or else Parent (Decl) = Library_Unit (Cunit (Main_Unit))
1014 Generate_Reference (Id, Scope (Id), 'k', False);
1016 elsif not Nkind_In (Unit (Cunit (Main_Unit)), N_Subprogram_Body,
1019 -- If current unit is an ancestor of main unit, generate a
1020 -- reference to its own parent.
1024 Main_Spec : Node_Id := Unit (Cunit (Main_Unit));
1027 if Nkind (Main_Spec) = N_Package_Body then
1028 Main_Spec := Unit (Library_Unit (Cunit (Main_Unit)));
1031 U := Parent_Spec (Main_Spec);
1032 while Present (U) loop
1033 if U = Parent (Decl) then
1034 Generate_Reference (Id, Scope (Id), 'k', False);
1037 elsif Nkind (Unit (U)) = N_Package_Body then
1041 U := Parent_Spec (Unit (U));
1046 end Generate_Parent_References;
1048 ---------------------
1049 -- Is_Public_Child --
1050 ---------------------
1052 function Is_Public_Child (Child, Unit : Entity_Id) return Boolean is
1054 if not Is_Private_Descendant (Child) then
1057 if Child = Unit then
1058 return not Private_Present (
1059 Parent (Unit_Declaration_Node (Child)));
1061 return Is_Public_Child (Scope (Child), Unit);
1064 end Is_Public_Child;
1066 ----------------------------------------
1067 -- Inspect_Unchecked_Union_Completion --
1068 ----------------------------------------
1070 procedure Inspect_Unchecked_Union_Completion (Decls : List_Id) is
1074 Decl := First (Decls);
1075 while Present (Decl) loop
1077 -- We are looking at an incomplete or private type declaration
1078 -- with a known_discriminant_part whose full view is an
1081 if Nkind_In (Decl, N_Incomplete_Type_Declaration,
1082 N_Private_Type_Declaration)
1083 and then Has_Discriminants (Defining_Identifier (Decl))
1084 and then Present (Full_View (Defining_Identifier (Decl)))
1086 Is_Unchecked_Union (Full_View (Defining_Identifier (Decl)))
1089 ("completion of discriminated partial view "
1090 & "cannot be an Unchecked_Union",
1091 Full_View (Defining_Identifier (Decl)));
1096 end Inspect_Unchecked_Union_Completion;
1098 -----------------------------------------
1099 -- Install_Parent_Private_Declarations --
1100 -----------------------------------------
1102 procedure Install_Parent_Private_Declarations (Inst_Id : Entity_Id) is
1103 Inst_Par : Entity_Id;
1104 Gen_Par : Entity_Id;
1105 Inst_Node : Node_Id;
1108 Inst_Par := Inst_Id;
1111 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
1112 while Present (Gen_Par) and then Is_Child_Unit (Gen_Par) loop
1113 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
1115 if Nkind_In (Inst_Node, N_Package_Instantiation,
1116 N_Formal_Package_Declaration)
1117 and then Nkind (Name (Inst_Node)) = N_Expanded_Name
1119 Inst_Par := Entity (Prefix (Name (Inst_Node)));
1121 if Present (Renamed_Entity (Inst_Par)) then
1122 Inst_Par := Renamed_Entity (Inst_Par);
1127 (Specification (Unit_Declaration_Node (Inst_Par)));
1129 -- Install the private declarations and private use clauses
1130 -- of a parent instance of the child instance, unless the
1131 -- parent instance private declarations have already been
1132 -- installed earlier in Analyze_Package_Specification, which
1133 -- happens when a generic child is instantiated, and the
1134 -- instance is a child of the parent instance.
1136 -- Installing the use clauses of the parent instance twice
1137 -- is both unnecessary and wrong, because it would cause the
1138 -- clauses to be chained to themselves in the use clauses
1139 -- list of the scope stack entry. That in turn would cause
1140 -- an endless loop from End_Use_Clauses upon scope exit.
1142 -- The parent is now fully visible. It may be a hidden open
1143 -- scope if we are currently compiling some child instance
1144 -- declared within it, but while the current instance is being
1145 -- compiled the parent is immediately visible. In particular
1146 -- its entities must remain visible if a stack save/restore
1147 -- takes place through a call to Rtsfind.
1149 if Present (Gen_Par) then
1150 if not In_Private_Part (Inst_Par) then
1151 Install_Private_Declarations (Inst_Par);
1152 Set_Use (Private_Declarations
1154 (Unit_Declaration_Node (Inst_Par))));
1155 Set_Is_Hidden_Open_Scope (Inst_Par, False);
1158 -- If we've reached the end of the generic instance parents,
1159 -- then finish off by looping through the nongeneric parents
1160 -- and installing their private declarations.
1163 while Present (Inst_Par)
1164 and then Inst_Par /= Standard_Standard
1165 and then (not In_Open_Scopes (Inst_Par)
1166 or else not In_Private_Part (Inst_Par))
1168 Install_Private_Declarations (Inst_Par);
1169 Set_Use (Private_Declarations
1171 (Unit_Declaration_Node (Inst_Par))));
1172 Inst_Par := Scope (Inst_Par);
1182 end Install_Parent_Private_Declarations;
1184 -- Start of processing for Analyze_Package_Specification
1187 if Present (Vis_Decls) then
1188 Analyze_Declarations (Vis_Decls);
1191 -- Verify that incomplete types have received full declarations and
1192 -- also build invariant procedures for any types with invariants.
1194 E := First_Entity (Id);
1195 while Present (E) loop
1197 -- Check on incomplete types
1198 -- AI05-213 : a formal incomplete type has no completion.
1200 if Ekind (E) = E_Incomplete_Type
1201 and then No (Full_View (E))
1202 and then not Is_Generic_Type (E)
1204 Error_Msg_N ("no declaration in visible part for incomplete}", E);
1207 -- Build invariant procedures
1209 if Is_Type (E) and then Has_Invariants (E) then
1210 Build_Invariant_Procedure (E, N);
1216 if Is_Remote_Call_Interface (Id)
1217 and then Nkind (Parent (Parent (N))) = N_Compilation_Unit
1219 Validate_RCI_Declarations (Id);
1222 -- Save global references in the visible declarations, before installing
1223 -- private declarations of parent unit if there is one, because the
1224 -- privacy status of types defined in the parent will change. This is
1225 -- only relevant for generic child units, but is done in all cases for
1228 if Ekind (Id) = E_Generic_Package
1229 and then Nkind (Orig_Decl) = N_Generic_Package_Declaration
1232 Orig_Spec : constant Node_Id := Specification (Orig_Decl);
1233 Save_Priv : constant List_Id := Private_Declarations (Orig_Spec);
1235 Set_Private_Declarations (Orig_Spec, Empty_List);
1236 Save_Global_References (Orig_Decl);
1237 Set_Private_Declarations (Orig_Spec, Save_Priv);
1241 -- If package is a public child unit, then make the private declarations
1242 -- of the parent visible.
1244 Public_Child := False;
1248 Pack_Decl : Node_Id;
1253 Par_Spec := Parent_Spec (Parent (N));
1255 -- If the package is formal package of an enclosing generic, it is
1256 -- transformed into a local generic declaration, and compiled to make
1257 -- its spec available. We need to retrieve the original generic to
1258 -- determine whether it is a child unit, and install its parents.
1262 Nkind (Original_Node (Parent (N))) = N_Formal_Package_Declaration
1264 Par := Entity (Name (Original_Node (Parent (N))));
1265 Par_Spec := Parent_Spec (Unit_Declaration_Node (Par));
1268 if Present (Par_Spec) then
1269 Generate_Parent_References;
1271 while Scope (Par) /= Standard_Standard
1272 and then Is_Public_Child (Id, Par)
1273 and then In_Open_Scopes (Par)
1275 Public_Child := True;
1277 Install_Private_Declarations (Par);
1278 Install_Private_With_Clauses (Par);
1279 Pack_Decl := Unit_Declaration_Node (Par);
1280 Set_Use (Private_Declarations (Specification (Pack_Decl)));
1285 if Is_Compilation_Unit (Id) then
1286 Install_Private_With_Clauses (Id);
1289 -- The current compilation unit may include private with_clauses,
1290 -- which are visible in the private part of the current nested
1291 -- package, and have to be installed now. This is not done for
1292 -- nested instantiations, where the private with_clauses of the
1293 -- enclosing unit have no effect once the instantiation info is
1294 -- established and we start analyzing the package declaration.
1297 Comp_Unit : constant Entity_Id := Cunit_Entity (Current_Sem_Unit);
1299 if Is_Package_Or_Generic_Package (Comp_Unit)
1300 and then not In_Private_Part (Comp_Unit)
1301 and then not In_Instance
1303 Install_Private_With_Clauses (Comp_Unit);
1304 Private_With_Clauses_Installed := True;
1309 -- If this is a package associated with a generic instance or formal
1310 -- package, then the private declarations of each of the generic's
1311 -- parents must be installed at this point.
1313 if Is_Generic_Instance (Id) then
1314 Install_Parent_Private_Declarations (Id);
1317 -- Analyze private part if present. The flag In_Private_Part is reset
1318 -- in End_Package_Scope.
1320 L := Last_Entity (Id);
1322 if Present (Priv_Decls) then
1323 Set_In_Private_Part (Id);
1325 -- Upon entering a public child's private part, it may be necessary
1326 -- to declare subprograms that were derived in the package's visible
1327 -- part but not yet made visible.
1329 if Public_Child then
1330 Declare_Inherited_Private_Subprograms (Id);
1333 Analyze_Declarations (Priv_Decls);
1335 -- Check the private declarations for incomplete deferred constants
1337 Inspect_Deferred_Constant_Completion (Priv_Decls);
1339 -- The first private entity is the immediate follower of the last
1340 -- visible entity, if there was one.
1343 Set_First_Private_Entity (Id, Next_Entity (L));
1345 Set_First_Private_Entity (Id, First_Entity (Id));
1348 -- There may be inherited private subprograms that need to be declared,
1349 -- even in the absence of an explicit private part. If there are any
1350 -- public declarations in the package and the package is a public child
1351 -- unit, then an implicit private part is assumed.
1353 elsif Present (L) and then Public_Child then
1354 Set_In_Private_Part (Id);
1355 Declare_Inherited_Private_Subprograms (Id);
1356 Set_First_Private_Entity (Id, Next_Entity (L));
1359 E := First_Entity (Id);
1360 while Present (E) loop
1362 -- Check rule of 3.6(11), which in general requires waiting till all
1363 -- full types have been seen.
1365 if Ekind (E) = E_Record_Type or else Ekind (E) = E_Array_Type then
1366 Check_Aliased_Component_Types (E);
1369 -- Check preelaborable initialization for full type completing a
1370 -- private type for which pragma Preelaborable_Initialization given.
1373 and then Must_Have_Preelab_Init (E)
1374 and then not Has_Preelaborable_Initialization (E)
1377 ("full view of & does not have preelaborable initialization", E);
1383 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1384 -- declaration having a known_discriminant_part shall not be an
1385 -- Unchecked_Union type.
1387 if Present (Vis_Decls) then
1388 Inspect_Unchecked_Union_Completion (Vis_Decls);
1391 if Present (Priv_Decls) then
1392 Inspect_Unchecked_Union_Completion (Priv_Decls);
1395 if Ekind (Id) = E_Generic_Package
1396 and then Nkind (Orig_Decl) = N_Generic_Package_Declaration
1397 and then Present (Priv_Decls)
1399 -- Save global references in private declarations, ignoring the
1400 -- visible declarations that were processed earlier.
1403 Orig_Spec : constant Node_Id := Specification (Orig_Decl);
1404 Save_Vis : constant List_Id := Visible_Declarations (Orig_Spec);
1405 Save_Form : constant List_Id :=
1406 Generic_Formal_Declarations (Orig_Decl);
1409 Set_Visible_Declarations (Orig_Spec, Empty_List);
1410 Set_Generic_Formal_Declarations (Orig_Decl, Empty_List);
1411 Save_Global_References (Orig_Decl);
1412 Set_Generic_Formal_Declarations (Orig_Decl, Save_Form);
1413 Set_Visible_Declarations (Orig_Spec, Save_Vis);
1417 Process_End_Label (N, 'e', Id);
1419 -- Remove private_with_clauses of enclosing compilation unit, if they
1422 if Private_With_Clauses_Installed then
1423 Remove_Private_With_Clauses (Cunit (Current_Sem_Unit));
1426 -- For the case of a library level package, we must go through all the
1427 -- entities clearing the indications that the value may be constant and
1428 -- not modified. Why? Because any client of this package may modify
1429 -- these values freely from anywhere. This also applies to any nested
1430 -- packages or generic packages.
1432 -- For now we unconditionally clear constants for packages that are
1433 -- instances of generic packages. The reason is that we do not have the
1434 -- body yet, and we otherwise think things are unreferenced when they
1435 -- are not. This should be fixed sometime (the effect is not terrible,
1436 -- we just lose some warnings, and also some cases of value propagation)
1439 if Is_Library_Level_Entity (Id)
1440 or else Is_Generic_Instance (Id)
1442 Clear_Constants (Id, First_Entity (Id));
1443 Clear_Constants (Id, First_Private_Entity (Id));
1446 Check_One_Tagged_Type_Or_Extension_At_Most;
1447 end Analyze_Package_Specification;
1449 --------------------------------------
1450 -- Analyze_Private_Type_Declaration --
1451 --------------------------------------
1453 procedure Analyze_Private_Type_Declaration (N : Node_Id) is
1454 PF : constant Boolean := Is_Pure (Enclosing_Lib_Unit_Entity);
1455 Id : constant Entity_Id := Defining_Identifier (N);
1458 Generate_Definition (Id);
1459 Set_Is_Pure (Id, PF);
1460 Init_Size_Align (Id);
1462 if not Is_Package_Or_Generic_Package (Current_Scope)
1463 or else In_Private_Part (Current_Scope)
1465 Error_Msg_N ("invalid context for private declaration", N);
1468 New_Private_Type (N, Id, N);
1469 Set_Depends_On_Private (Id);
1471 if Has_Aspects (N) then
1472 Analyze_Aspect_Specifications (N, Id);
1474 end Analyze_Private_Type_Declaration;
1476 ----------------------------------
1477 -- Check_Anonymous_Access_Types --
1478 ----------------------------------
1480 procedure Check_Anonymous_Access_Types
1481 (Spec_Id : Entity_Id;
1488 -- Itype references are only needed by gigi, to force elaboration of
1489 -- itypes. In the absence of code generation, they are not needed.
1491 if not Expander_Active then
1495 E := First_Entity (Spec_Id);
1496 while Present (E) loop
1497 if Ekind (E) = E_Anonymous_Access_Type
1498 and then From_With_Type (E)
1500 IR := Make_Itype_Reference (Sloc (P_Body));
1503 if No (Declarations (P_Body)) then
1504 Set_Declarations (P_Body, New_List (IR));
1506 Prepend (IR, Declarations (P_Body));
1512 end Check_Anonymous_Access_Types;
1514 -------------------------------------------
1515 -- Declare_Inherited_Private_Subprograms --
1516 -------------------------------------------
1518 procedure Declare_Inherited_Private_Subprograms (Id : Entity_Id) is
1520 function Is_Primitive_Of (T : Entity_Id; S : Entity_Id) return Boolean;
1521 -- Check whether an inherited subprogram S is an operation of an
1522 -- untagged derived type T.
1524 ---------------------
1525 -- Is_Primitive_Of --
1526 ---------------------
1528 function Is_Primitive_Of (T : Entity_Id; S : Entity_Id) return Boolean is
1532 -- If the full view is a scalar type, the type is the anonymous base
1533 -- type, but the operation mentions the first subtype, so check the
1534 -- signature against the base type.
1536 if Base_Type (Etype (S)) = Base_Type (T) then
1540 Formal := First_Formal (S);
1541 while Present (Formal) loop
1542 if Base_Type (Etype (Formal)) = Base_Type (T) then
1546 Next_Formal (Formal);
1551 end Is_Primitive_Of;
1558 Op_Elmt_2 : Elmt_Id;
1559 Prim_Op : Entity_Id;
1560 New_Op : Entity_Id := Empty;
1561 Parent_Subp : Entity_Id;
1564 -- Start of processing for Declare_Inherited_Private_Subprograms
1567 E := First_Entity (Id);
1568 while Present (E) loop
1570 -- If the entity is a nonprivate type extension whose parent type
1571 -- is declared in an open scope, then the type may have inherited
1572 -- operations that now need to be made visible. Ditto if the entity
1573 -- is a formal derived type in a child unit.
1575 if ((Is_Derived_Type (E) and then not Is_Private_Type (E))
1577 (Nkind (Parent (E)) = N_Private_Extension_Declaration
1578 and then Is_Generic_Type (E)))
1579 and then In_Open_Scopes (Scope (Etype (E)))
1580 and then Is_Base_Type (E)
1582 if Is_Tagged_Type (E) then
1583 Op_List := Primitive_Operations (E);
1585 Tag := First_Tag_Component (E);
1587 Op_Elmt := First_Elmt (Op_List);
1588 while Present (Op_Elmt) loop
1589 Prim_Op := Node (Op_Elmt);
1591 -- Search primitives that are implicit operations with an
1592 -- internal name whose parent operation has a normal name.
1594 if Present (Alias (Prim_Op))
1595 and then Find_Dispatching_Type (Alias (Prim_Op)) /= E
1596 and then not Comes_From_Source (Prim_Op)
1597 and then Is_Internal_Name (Chars (Prim_Op))
1598 and then not Is_Internal_Name (Chars (Alias (Prim_Op)))
1600 Parent_Subp := Alias (Prim_Op);
1602 -- Case 1: Check if the type has also an explicit
1603 -- overriding for this primitive.
1605 Op_Elmt_2 := Next_Elmt (Op_Elmt);
1606 while Present (Op_Elmt_2) loop
1608 -- Skip entities with attribute Interface_Alias since
1609 -- they are not overriding primitives (these entities
1610 -- link an interface primitive with their covering
1613 if Chars (Node (Op_Elmt_2)) = Chars (Parent_Subp)
1614 and then Type_Conformant (Prim_Op, Node (Op_Elmt_2))
1615 and then No (Interface_Alias (Node (Op_Elmt_2)))
1617 -- The private inherited operation has been
1618 -- overridden by an explicit subprogram: replace
1619 -- the former by the latter.
1621 New_Op := Node (Op_Elmt_2);
1622 Replace_Elmt (Op_Elmt, New_Op);
1623 Remove_Elmt (Op_List, Op_Elmt_2);
1624 Set_Overridden_Operation (New_Op, Parent_Subp);
1626 -- We don't need to inherit its dispatching slot.
1627 -- Set_All_DT_Position has previously ensured that
1628 -- the same slot was assigned to the two primitives
1631 and then Present (DTC_Entity (New_Op))
1632 and then Present (DTC_Entity (Prim_Op))
1634 pragma Assert (DT_Position (New_Op)
1635 = DT_Position (Prim_Op));
1639 goto Next_Primitive;
1642 Next_Elmt (Op_Elmt_2);
1645 -- Case 2: We have not found any explicit overriding and
1646 -- hence we need to declare the operation (i.e., make it
1649 Derive_Subprogram (New_Op, Alias (Prim_Op), E, Etype (E));
1651 -- Inherit the dispatching slot if E is already frozen
1654 and then Present (DTC_Entity (Alias (Prim_Op)))
1656 Set_DTC_Entity_Value (E, New_Op);
1657 Set_DT_Position (New_Op,
1658 DT_Position (Alias (Prim_Op)));
1662 (Is_Dispatching_Operation (New_Op)
1663 and then Node (Last_Elmt (Op_List)) = New_Op);
1665 -- Substitute the new operation for the old one in the
1666 -- type's primitive operations list. Since the new
1667 -- operation was also just added to the end of list,
1668 -- the last element must be removed.
1670 -- (Question: is there a simpler way of declaring the
1671 -- operation, say by just replacing the name of the
1672 -- earlier operation, reentering it in the in the symbol
1673 -- table (how?), and marking it as private???)
1675 Replace_Elmt (Op_Elmt, New_Op);
1676 Remove_Last_Elmt (Op_List);
1680 Next_Elmt (Op_Elmt);
1683 -- Generate listing showing the contents of the dispatch table
1685 if Debug_Flag_ZZ then
1690 -- Non-tagged type, scan forward to locate inherited hidden
1693 Prim_Op := Next_Entity (E);
1694 while Present (Prim_Op) loop
1695 if Is_Subprogram (Prim_Op)
1696 and then Present (Alias (Prim_Op))
1697 and then not Comes_From_Source (Prim_Op)
1698 and then Is_Internal_Name (Chars (Prim_Op))
1699 and then not Is_Internal_Name (Chars (Alias (Prim_Op)))
1700 and then Is_Primitive_Of (E, Prim_Op)
1702 Derive_Subprogram (New_Op, Alias (Prim_Op), E, Etype (E));
1705 Next_Entity (Prim_Op);
1712 end Declare_Inherited_Private_Subprograms;
1714 -----------------------
1715 -- End_Package_Scope --
1716 -----------------------
1718 procedure End_Package_Scope (P : Entity_Id) is
1720 Uninstall_Declarations (P);
1722 end End_Package_Scope;
1724 ---------------------------
1725 -- Exchange_Declarations --
1726 ---------------------------
1728 procedure Exchange_Declarations (Id : Entity_Id) is
1729 Full_Id : constant Entity_Id := Full_View (Id);
1730 H1 : constant Entity_Id := Homonym (Id);
1731 Next1 : constant Entity_Id := Next_Entity (Id);
1736 -- If missing full declaration for type, nothing to exchange
1738 if No (Full_Id) then
1742 -- Otherwise complete the exchange, and preserve semantic links
1744 Next2 := Next_Entity (Full_Id);
1745 H2 := Homonym (Full_Id);
1747 -- Reset full declaration pointer to reflect the switched entities and
1748 -- readjust the next entity chains.
1750 Exchange_Entities (Id, Full_Id);
1752 Set_Next_Entity (Id, Next1);
1753 Set_Homonym (Id, H1);
1755 Set_Full_View (Full_Id, Id);
1756 Set_Next_Entity (Full_Id, Next2);
1757 Set_Homonym (Full_Id, H2);
1758 end Exchange_Declarations;
1760 ----------------------------
1761 -- Install_Package_Entity --
1762 ----------------------------
1764 procedure Install_Package_Entity (Id : Entity_Id) is
1766 if not Is_Internal (Id) then
1767 if Debug_Flag_E then
1768 Write_Str ("Install: ");
1769 Write_Name (Chars (Id));
1773 if not Is_Child_Unit (Id) then
1774 Set_Is_Immediately_Visible (Id);
1778 end Install_Package_Entity;
1780 ----------------------------------
1781 -- Install_Private_Declarations --
1782 ----------------------------------
1784 procedure Install_Private_Declarations (P : Entity_Id) is
1786 Priv_Elmt : Elmt_Id;
1791 -- First exchange declarations for private types, so that the full
1792 -- declaration is visible. For each private type, we check its
1793 -- Private_Dependents list and also exchange any subtypes of or derived
1794 -- types from it. Finally, if this is a Taft amendment type, the
1795 -- incomplete declaration is irrelevant, and we want to link the
1796 -- eventual full declaration with the original private one so we also
1797 -- skip the exchange.
1799 Id := First_Entity (P);
1800 while Present (Id) and then Id /= First_Private_Entity (P) loop
1801 if Is_Private_Base_Type (Id)
1802 and then Comes_From_Source (Full_View (Id))
1803 and then Present (Full_View (Id))
1804 and then Scope (Full_View (Id)) = Scope (Id)
1805 and then Ekind (Full_View (Id)) /= E_Incomplete_Type
1807 -- If there is a use-type clause on the private type, set the
1808 -- full view accordingly.
1810 Set_In_Use (Full_View (Id), In_Use (Id));
1811 Full := Full_View (Id);
1813 if Is_Private_Base_Type (Full)
1814 and then Has_Private_Declaration (Full)
1815 and then Nkind (Parent (Full)) = N_Full_Type_Declaration
1816 and then In_Open_Scopes (Scope (Etype (Full)))
1817 and then In_Package_Body (Current_Scope)
1818 and then not Is_Private_Type (Etype (Full))
1820 -- This is the completion of a private type by a derivation
1821 -- from another private type which is not private anymore. This
1822 -- can only happen in a package nested within a child package,
1823 -- when the parent type is defined in the parent unit. At this
1824 -- point the current type is not private either, and we have to
1825 -- install the underlying full view, which is now visible. Save
1826 -- the current full view as well, so that all views can be
1827 -- restored on exit. It may seem that after compiling the child
1828 -- body there are not environments to restore, but the back-end
1829 -- expects those links to be valid, and freeze nodes depend on
1832 if No (Full_View (Full))
1833 and then Present (Underlying_Full_View (Full))
1835 Set_Full_View (Id, Underlying_Full_View (Full));
1836 Set_Underlying_Full_View (Id, Full);
1838 Set_Underlying_Full_View (Full, Empty);
1839 Set_Is_Frozen (Full_View (Id));
1843 Priv_Elmt := First_Elmt (Private_Dependents (Id));
1845 Exchange_Declarations (Id);
1846 Set_Is_Immediately_Visible (Id);
1848 while Present (Priv_Elmt) loop
1849 Priv := Node (Priv_Elmt);
1851 -- Before the exchange, verify that the presence of the
1852 -- Full_View field. It will be empty if the entity has already
1853 -- been installed due to a previous call.
1855 if Present (Full_View (Priv))
1856 and then Is_Visible_Dependent (Priv)
1859 -- For each subtype that is swapped, we also swap the
1860 -- reference to it in Private_Dependents, to allow access
1861 -- to it when we swap them out in End_Package_Scope.
1863 Replace_Elmt (Priv_Elmt, Full_View (Priv));
1864 Exchange_Declarations (Priv);
1865 Set_Is_Immediately_Visible
1866 (Priv, In_Open_Scopes (Scope (Priv)));
1867 Set_Is_Potentially_Use_Visible
1868 (Priv, Is_Potentially_Use_Visible (Node (Priv_Elmt)));
1871 Next_Elmt (Priv_Elmt);
1878 -- Next make other declarations in the private part visible as well
1880 Id := First_Private_Entity (P);
1881 while Present (Id) loop
1882 Install_Package_Entity (Id);
1883 Set_Is_Hidden (Id, False);
1887 -- Indicate that the private part is currently visible, so it can be
1888 -- properly reset on exit.
1890 Set_In_Private_Part (P);
1891 end Install_Private_Declarations;
1893 ----------------------------------
1894 -- Install_Visible_Declarations --
1895 ----------------------------------
1897 procedure Install_Visible_Declarations (P : Entity_Id) is
1899 Last_Entity : Entity_Id;
1903 (Is_Package_Or_Generic_Package (P) or else Is_Record_Type (P));
1905 if Is_Package_Or_Generic_Package (P) then
1906 Last_Entity := First_Private_Entity (P);
1908 Last_Entity := Empty;
1911 Id := First_Entity (P);
1912 while Present (Id) and then Id /= Last_Entity loop
1913 Install_Package_Entity (Id);
1916 end Install_Visible_Declarations;
1918 --------------------------
1919 -- Is_Private_Base_Type --
1920 --------------------------
1922 function Is_Private_Base_Type (E : Entity_Id) return Boolean is
1924 return Ekind (E) = E_Private_Type
1925 or else Ekind (E) = E_Limited_Private_Type
1926 or else Ekind (E) = E_Record_Type_With_Private;
1927 end Is_Private_Base_Type;
1929 --------------------------
1930 -- Is_Visible_Dependent --
1931 --------------------------
1933 function Is_Visible_Dependent (Dep : Entity_Id) return Boolean
1935 S : constant Entity_Id := Scope (Dep);
1938 -- Renamings created for actual types have the visibility of the actual
1940 if Ekind (S) = E_Package
1941 and then Is_Generic_Instance (S)
1942 and then (Is_Generic_Actual_Type (Dep)
1943 or else Is_Generic_Actual_Type (Full_View (Dep)))
1947 elsif not (Is_Derived_Type (Dep))
1948 and then Is_Derived_Type (Full_View (Dep))
1950 -- When instantiating a package body, the scope stack is empty, so
1951 -- check instead whether the dependent type is defined in the same
1952 -- scope as the instance itself.
1954 return In_Open_Scopes (S)
1955 or else (Is_Generic_Instance (Current_Scope)
1956 and then Scope (Dep) = Scope (Current_Scope));
1960 end Is_Visible_Dependent;
1962 ----------------------------
1963 -- May_Need_Implicit_Body --
1964 ----------------------------
1966 procedure May_Need_Implicit_Body (E : Entity_Id) is
1967 P : constant Node_Id := Unit_Declaration_Node (E);
1968 S : constant Node_Id := Parent (P);
1973 if not Has_Completion (E)
1974 and then Nkind (P) = N_Package_Declaration
1975 and then (Present (Activation_Chain_Entity (P)) or else Has_RACW (E))
1978 Make_Package_Body (Sloc (E),
1979 Defining_Unit_Name => Make_Defining_Identifier (Sloc (E),
1980 Chars => Chars (E)),
1981 Declarations => New_List);
1983 if Nkind (S) = N_Package_Specification then
1984 if Present (Private_Declarations (S)) then
1985 Decls := Private_Declarations (S);
1987 Decls := Visible_Declarations (S);
1990 Decls := Declarations (S);
1996 end May_Need_Implicit_Body;
1998 ----------------------
1999 -- New_Private_Type --
2000 ----------------------
2002 procedure New_Private_Type (N : Node_Id; Id : Entity_Id; Def : Node_Id) is
2004 -- For other than Ada 2012, enter the name in the current scope
2006 if Ada_Version < Ada_2012 then
2009 -- Ada 2012 (AI05-0162): Enter the name in the current scope handling
2010 -- private type that completes an incomplete type.
2016 Prev := Find_Type_Name (N);
2017 pragma Assert (Prev = Id
2018 or else (Ekind (Prev) = E_Incomplete_Type
2019 and then Present (Full_View (Prev))
2020 and then Full_View (Prev) = Id));
2024 if Limited_Present (Def) then
2025 Set_Ekind (Id, E_Limited_Private_Type);
2027 Set_Ekind (Id, E_Private_Type);
2031 Set_Has_Delayed_Freeze (Id);
2032 Set_Is_First_Subtype (Id);
2033 Init_Size_Align (Id);
2035 Set_Is_Constrained (Id,
2036 No (Discriminant_Specifications (N))
2037 and then not Unknown_Discriminants_Present (N));
2039 -- Set tagged flag before processing discriminants, to catch illegal
2042 Set_Is_Tagged_Type (Id, Tagged_Present (Def));
2044 Set_Discriminant_Constraint (Id, No_Elist);
2045 Set_Stored_Constraint (Id, No_Elist);
2047 if Present (Discriminant_Specifications (N)) then
2049 Process_Discriminants (N);
2052 elsif Unknown_Discriminants_Present (N) then
2053 Set_Has_Unknown_Discriminants (Id);
2056 Set_Private_Dependents (Id, New_Elmt_List);
2058 if Tagged_Present (Def) then
2059 Set_Ekind (Id, E_Record_Type_With_Private);
2060 Set_Direct_Primitive_Operations (Id, New_Elmt_List);
2061 Set_Is_Abstract_Type (Id, Abstract_Present (Def));
2062 Set_Is_Limited_Record (Id, Limited_Present (Def));
2063 Set_Has_Delayed_Freeze (Id, True);
2065 -- Create a class-wide type with the same attributes
2067 Make_Class_Wide_Type (Id);
2069 elsif Abstract_Present (Def) then
2070 Error_Msg_N ("only a tagged type can be abstract", N);
2072 end New_Private_Type;
2074 ----------------------------
2075 -- Uninstall_Declarations --
2076 ----------------------------
2078 procedure Uninstall_Declarations (P : Entity_Id) is
2079 Decl : constant Node_Id := Unit_Declaration_Node (P);
2082 Priv_Elmt : Elmt_Id;
2083 Priv_Sub : Entity_Id;
2085 procedure Preserve_Full_Attributes (Priv, Full : Entity_Id);
2086 -- Copy to the private declaration the attributes of the full view that
2087 -- need to be available for the partial view also.
2089 function Type_In_Use (T : Entity_Id) return Boolean;
2090 -- Check whether type or base type appear in an active use_type clause
2092 ------------------------------
2093 -- Preserve_Full_Attributes --
2094 ------------------------------
2096 procedure Preserve_Full_Attributes (Priv, Full : Entity_Id) is
2097 Priv_Is_Base_Type : constant Boolean := Is_Base_Type (Priv);
2100 Set_Size_Info (Priv, (Full));
2101 Set_RM_Size (Priv, RM_Size (Full));
2102 Set_Size_Known_At_Compile_Time
2103 (Priv, Size_Known_At_Compile_Time (Full));
2104 Set_Is_Volatile (Priv, Is_Volatile (Full));
2105 Set_Treat_As_Volatile (Priv, Treat_As_Volatile (Full));
2106 Set_Is_Ada_2005_Only (Priv, Is_Ada_2005_Only (Full));
2107 Set_Is_Ada_2012_Only (Priv, Is_Ada_2012_Only (Full));
2108 Set_Has_Pragma_Unmodified (Priv, Has_Pragma_Unmodified (Full));
2109 Set_Has_Pragma_Unreferenced (Priv, Has_Pragma_Unreferenced (Full));
2110 Set_Has_Pragma_Unreferenced_Objects
2111 (Priv, Has_Pragma_Unreferenced_Objects
2113 if Is_Unchecked_Union (Full) then
2114 Set_Is_Unchecked_Union (Base_Type (Priv));
2116 -- Why is atomic not copied here ???
2118 if Referenced (Full) then
2119 Set_Referenced (Priv);
2122 if Priv_Is_Base_Type then
2123 Set_Is_Controlled (Priv, Is_Controlled (Base_Type (Full)));
2124 Set_Finalize_Storage_Only (Priv, Finalize_Storage_Only
2125 (Base_Type (Full)));
2126 Set_Has_Task (Priv, Has_Task (Base_Type (Full)));
2127 Set_Has_Controlled_Component (Priv, Has_Controlled_Component
2128 (Base_Type (Full)));
2131 Set_Freeze_Node (Priv, Freeze_Node (Full));
2133 if Is_Tagged_Type (Priv)
2134 and then Is_Tagged_Type (Full)
2135 and then not Error_Posted (Full)
2137 if Is_Tagged_Type (Priv) then
2139 -- If the type is tagged, the tag itself must be available on
2140 -- the partial view, for expansion purposes.
2142 Set_First_Entity (Priv, First_Entity (Full));
2144 -- If there are discriminants in the partial view, these remain
2145 -- visible. Otherwise only the tag itself is visible, and there
2146 -- are no nameable components in the partial view.
2148 if No (Last_Entity (Priv)) then
2149 Set_Last_Entity (Priv, First_Entity (Priv));
2153 Set_Has_Discriminants (Priv, Has_Discriminants (Full));
2155 if Has_Discriminants (Full) then
2156 Set_Discriminant_Constraint (Priv,
2157 Discriminant_Constraint (Full));
2160 end Preserve_Full_Attributes;
2166 function Type_In_Use (T : Entity_Id) return Boolean is
2168 return Scope (Base_Type (T)) = P
2169 and then (In_Use (T) or else In_Use (Base_Type (T)));
2172 -- Start of processing for Uninstall_Declarations
2175 Id := First_Entity (P);
2176 while Present (Id) and then Id /= First_Private_Entity (P) loop
2177 if Debug_Flag_E then
2178 Write_Str ("unlinking visible entity ");
2179 Write_Int (Int (Id));
2183 -- On exit from the package scope, we must preserve the visibility
2184 -- established by use clauses in the current scope. Two cases:
2186 -- a) If the entity is an operator, it may be a primitive operator of
2187 -- a type for which there is a visible use-type clause.
2189 -- b) for other entities, their use-visibility is determined by a
2190 -- visible use clause for the package itself. For a generic instance,
2191 -- the instantiation of the formals appears in the visible part,
2192 -- but the formals are private and remain so.
2194 if Ekind (Id) = E_Function
2195 and then Is_Operator_Symbol_Name (Chars (Id))
2196 and then not Is_Hidden (Id)
2197 and then not Error_Posted (Id)
2199 Set_Is_Potentially_Use_Visible (Id,
2201 or else Type_In_Use (Etype (Id))
2202 or else Type_In_Use (Etype (First_Formal (Id)))
2203 or else (Present (Next_Formal (First_Formal (Id)))
2206 (Etype (Next_Formal (First_Formal (Id))))));
2208 if In_Use (P) and then not Is_Hidden (Id) then
2210 -- A child unit of a use-visible package remains use-visible
2211 -- only if it is itself a visible child unit. Otherwise it
2212 -- would remain visible in other contexts where P is use-
2213 -- visible, because once compiled it stays in the entity list
2214 -- of its parent unit.
2216 if Is_Child_Unit (Id) then
2217 Set_Is_Potentially_Use_Visible (Id,
2218 Is_Visible_Child_Unit (Id));
2220 Set_Is_Potentially_Use_Visible (Id);
2224 Set_Is_Potentially_Use_Visible (Id, False);
2228 -- Local entities are not immediately visible outside of the package
2230 Set_Is_Immediately_Visible (Id, False);
2232 -- If this is a private type with a full view (for example a local
2233 -- subtype of a private type declared elsewhere), ensure that the
2234 -- full view is also removed from visibility: it may be exposed when
2235 -- swapping views in an instantiation.
2238 and then Present (Full_View (Id))
2240 Set_Is_Immediately_Visible (Full_View (Id), False);
2243 if Is_Tagged_Type (Id) and then Ekind (Id) = E_Record_Type then
2244 Check_Abstract_Overriding (Id);
2245 Check_Conventions (Id);
2248 if (Ekind (Id) = E_Private_Type
2249 or else Ekind (Id) = E_Limited_Private_Type)
2250 and then No (Full_View (Id))
2251 and then not Is_Generic_Type (Id)
2252 and then not Is_Derived_Type (Id)
2254 Error_Msg_N ("missing full declaration for private type&", Id);
2256 elsif Ekind (Id) = E_Record_Type_With_Private
2257 and then not Is_Generic_Type (Id)
2258 and then No (Full_View (Id))
2260 if Nkind (Parent (Id)) = N_Private_Type_Declaration then
2261 Error_Msg_N ("missing full declaration for private type&", Id);
2264 ("missing full declaration for private extension", Id);
2267 -- Case of constant, check for deferred constant declaration with
2268 -- no full view. Likely just a matter of a missing expression, or
2269 -- accidental use of the keyword constant.
2271 elsif Ekind (Id) = E_Constant
2273 -- OK if constant value present
2275 and then No (Constant_Value (Id))
2277 -- OK if full view present
2279 and then No (Full_View (Id))
2281 -- OK if imported, since that provides the completion
2283 and then not Is_Imported (Id)
2285 -- OK if object declaration replaced by renaming declaration as
2286 -- a result of OK_To_Rename processing (e.g. for concatenation)
2288 and then Nkind (Parent (Id)) /= N_Object_Renaming_Declaration
2290 -- OK if object declaration with the No_Initialization flag set
2292 and then not (Nkind (Parent (Id)) = N_Object_Declaration
2293 and then No_Initialization (Parent (Id)))
2295 -- If no private declaration is present, we assume the user did
2296 -- not intend a deferred constant declaration and the problem
2297 -- is simply that the initializing expression is missing.
2299 if not Has_Private_Declaration (Etype (Id)) then
2301 -- We assume that the user did not intend a deferred constant
2302 -- declaration, and the expression is just missing.
2305 ("constant declaration requires initialization expression",
2308 if Is_Limited_Type (Etype (Id)) then
2310 ("\if variable intended, remove CONSTANT from declaration",
2314 -- Otherwise if a private declaration is present, then we are
2315 -- missing the full declaration for the deferred constant.
2319 ("missing full declaration for deferred constant (RM 7.4)",
2322 if Is_Limited_Type (Etype (Id)) then
2324 ("\if variable intended, remove CONSTANT from declaration",
2333 -- If the specification was installed as the parent of a public child
2334 -- unit, the private declarations were not installed, and there is
2337 if not In_Private_Part (P) then
2340 Set_In_Private_Part (P, False);
2343 -- Make private entities invisible and exchange full and private
2344 -- declarations for private types. Id is now the first private entity
2347 while Present (Id) loop
2348 if Debug_Flag_E then
2349 Write_Str ("unlinking private entity ");
2350 Write_Int (Int (Id));
2354 if Is_Tagged_Type (Id) and then Ekind (Id) = E_Record_Type then
2355 Check_Abstract_Overriding (Id);
2356 Check_Conventions (Id);
2359 Set_Is_Immediately_Visible (Id, False);
2361 if Is_Private_Base_Type (Id)
2362 and then Present (Full_View (Id))
2364 Full := Full_View (Id);
2366 -- If the partial view is not declared in the visible part of the
2367 -- package (as is the case when it is a type derived from some
2368 -- other private type in the private part of the current package),
2369 -- no exchange takes place.
2372 or else List_Containing (Parent (Id))
2373 /= Visible_Declarations (Specification (Decl))
2378 -- The entry in the private part points to the full declaration,
2379 -- which is currently visible. Exchange them so only the private
2380 -- type declaration remains accessible, and link private and full
2381 -- declaration in the opposite direction. Before the actual
2382 -- exchange, we copy back attributes of the full view that must
2383 -- be available to the partial view too.
2385 Preserve_Full_Attributes (Id, Full);
2387 Set_Is_Potentially_Use_Visible (Id, In_Use (P));
2389 if Is_Indefinite_Subtype (Full)
2390 and then not Is_Indefinite_Subtype (Id)
2393 ("full view of type must be definite subtype", Full);
2396 Priv_Elmt := First_Elmt (Private_Dependents (Id));
2398 -- Swap out the subtypes and derived types of Id that were
2399 -- compiled in this scope, or installed previously by
2400 -- Install_Private_Declarations.
2402 -- Before we do the swap, we verify the presence of the Full_View
2403 -- field which may be empty due to a swap by a previous call to
2404 -- End_Package_Scope (e.g. from the freezing mechanism).
2406 while Present (Priv_Elmt) loop
2407 Priv_Sub := Node (Priv_Elmt);
2409 if Present (Full_View (Priv_Sub)) then
2411 if Scope (Priv_Sub) = P
2412 or else not In_Open_Scopes (Scope (Priv_Sub))
2414 Set_Is_Immediately_Visible (Priv_Sub, False);
2417 if Is_Visible_Dependent (Priv_Sub) then
2418 Preserve_Full_Attributes
2419 (Priv_Sub, Full_View (Priv_Sub));
2420 Replace_Elmt (Priv_Elmt, Full_View (Priv_Sub));
2421 Exchange_Declarations (Priv_Sub);
2425 Next_Elmt (Priv_Elmt);
2428 -- Now restore the type itself to its private view
2430 Exchange_Declarations (Id);
2432 -- If we have installed an underlying full view for a type derived
2433 -- from a private type in a child unit, restore the proper views
2434 -- of private and full view. See corresponding code in
2435 -- Install_Private_Declarations.
2437 -- After the exchange, Full denotes the private type in the
2438 -- visible part of the package.
2440 if Is_Private_Base_Type (Full)
2441 and then Present (Full_View (Full))
2442 and then Present (Underlying_Full_View (Full))
2443 and then In_Package_Body (Current_Scope)
2445 Set_Full_View (Full, Underlying_Full_View (Full));
2446 Set_Underlying_Full_View (Full, Empty);
2449 elsif Ekind (Id) = E_Incomplete_Type
2450 and then Comes_From_Source (Id)
2451 and then No (Full_View (Id))
2453 -- Mark Taft amendment types. Verify that there are no primitive
2454 -- operations declared for the type (3.10.1(9)).
2456 Set_Has_Completion_In_Body (Id);
2463 Elmt := First_Elmt (Private_Dependents (Id));
2464 while Present (Elmt) loop
2465 Subp := Node (Elmt);
2467 -- Is_Primitive is tested because there can be cases where
2468 -- nonprimitive subprograms (in nested packages) are added
2469 -- to the Private_Dependents list.
2471 if Is_Overloadable (Subp) and then Is_Primitive (Subp) then
2473 ("type& must be completed in the private part",
2476 -- The return type of an access_to_function cannot be a
2477 -- Taft-amendment type.
2479 elsif Ekind (Subp) = E_Subprogram_Type then
2480 if Etype (Subp) = Id
2482 (Is_Class_Wide_Type (Etype (Subp))
2483 and then Etype (Etype (Subp)) = Id)
2486 ("type& must be completed in the private part",
2487 Associated_Node_For_Itype (Subp), Id);
2495 elsif not Is_Child_Unit (Id)
2496 and then (not Is_Private_Type (Id)
2497 or else No (Full_View (Id)))
2500 Set_Is_Potentially_Use_Visible (Id, False);
2506 end Uninstall_Declarations;
2508 ------------------------
2509 -- Unit_Requires_Body --
2510 ------------------------
2512 function Unit_Requires_Body (P : Entity_Id) return Boolean is
2516 -- Imported entity never requires body. Right now, only subprograms can
2517 -- be imported, but perhaps in the future we will allow import of
2520 if Is_Imported (P) then
2523 -- Body required if library package with pragma Elaborate_Body
2525 elsif Has_Pragma_Elaborate_Body (P) then
2528 -- Body required if subprogram
2530 elsif Is_Subprogram (P) or else Is_Generic_Subprogram (P) then
2533 -- Treat a block as requiring a body
2535 elsif Ekind (P) = E_Block then
2538 elsif Ekind (P) = E_Package
2539 and then Nkind (Parent (P)) = N_Package_Specification
2540 and then Present (Generic_Parent (Parent (P)))
2543 G_P : constant Entity_Id := Generic_Parent (Parent (P));
2545 if Has_Pragma_Elaborate_Body (G_P) then
2551 -- Otherwise search entity chain for entity requiring completion
2553 E := First_Entity (P);
2554 while Present (E) loop
2556 -- Always ignore child units. Child units get added to the entity
2557 -- list of a parent unit, but are not original entities of the
2558 -- parent, and so do not affect whether the parent needs a body.
2560 if Is_Child_Unit (E) then
2563 -- Ignore formal packages and their renamings
2565 elsif Ekind (E) = E_Package
2566 and then Nkind (Original_Node (Unit_Declaration_Node (E))) =
2567 N_Formal_Package_Declaration
2571 -- Otherwise test to see if entity requires a completion.
2572 -- Note that subprogram entities whose declaration does not come
2573 -- from source are ignored here on the basis that we assume the
2574 -- expander will provide an implicit completion at some point.
2576 elsif (Is_Overloadable (E)
2577 and then Ekind (E) /= E_Enumeration_Literal
2578 and then Ekind (E) /= E_Operator
2579 and then not Is_Abstract_Subprogram (E)
2580 and then not Has_Completion (E)
2581 and then Comes_From_Source (Parent (E)))
2584 (Ekind (E) = E_Package
2586 and then not Has_Completion (E)
2587 and then Unit_Requires_Body (E))
2590 (Ekind (E) = E_Incomplete_Type
2591 and then No (Full_View (E))
2592 and then not Is_Generic_Type (E))
2595 ((Ekind (E) = E_Task_Type or else
2596 Ekind (E) = E_Protected_Type)
2597 and then not Has_Completion (E))
2600 (Ekind (E) = E_Generic_Package and then E /= P
2601 and then not Has_Completion (E)
2602 and then Unit_Requires_Body (E))
2605 (Is_Generic_Subprogram (E)
2606 and then not Has_Completion (E))
2611 -- Entity that does not require completion
2621 end Unit_Requires_Body;