1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2014, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 -- This package contains the routines to process package specifications and
27 -- bodies. The most important semantic aspects of package processing are the
28 -- handling of private and full declarations, and the construction of dispatch
29 -- tables for tagged types.
31 with Aspects; use Aspects;
32 with Atree; use Atree;
33 with Debug; use Debug;
34 with Einfo; use Einfo;
35 with Elists; use Elists;
36 with Errout; use Errout;
37 with Exp_Disp; use Exp_Disp;
38 with Exp_Dist; use Exp_Dist;
39 with Exp_Dbug; use Exp_Dbug;
41 with Lib.Xref; use Lib.Xref;
42 with Namet; use Namet;
43 with Nmake; use Nmake;
44 with Nlists; use Nlists;
46 with Output; use Output;
47 with Restrict; use Restrict;
49 with Sem_Aux; use Sem_Aux;
50 with Sem_Cat; use Sem_Cat;
51 with Sem_Ch3; use Sem_Ch3;
52 with Sem_Ch6; use Sem_Ch6;
53 with Sem_Ch8; use Sem_Ch8;
54 with Sem_Ch10; use Sem_Ch10;
55 with Sem_Ch12; use Sem_Ch12;
56 with Sem_Ch13; use Sem_Ch13;
57 with Sem_Disp; use Sem_Disp;
58 with Sem_Eval; use Sem_Eval;
59 with Sem_Prag; use Sem_Prag;
60 with Sem_Util; use Sem_Util;
61 with Sem_Warn; use Sem_Warn;
62 with Snames; use Snames;
63 with Stand; use Stand;
64 with Sinfo; use Sinfo;
65 with Sinput; use Sinput;
67 with Uintp; use Uintp;
69 package body Sem_Ch7 is
71 -----------------------------------
72 -- Handling private declarations --
73 -----------------------------------
75 -- The principle that each entity has a single defining occurrence clashes
76 -- with the presence of two separate definitions for private types: the
77 -- first is the private type declaration, and the second is the full type
78 -- declaration. It is important that all references to the type point to
79 -- the same defining occurrence, namely the first one. To enforce the two
80 -- separate views of the entity, the corresponding information is swapped
81 -- between the two declarations. Outside of the package, the defining
82 -- occurrence only contains the private declaration information, while in
83 -- the private part and the body of the package the defining occurrence
84 -- contains the full declaration. To simplify the swap, the defining
85 -- occurrence that currently holds the private declaration points to the
86 -- full declaration. During semantic processing the defining occurrence
87 -- also points to a list of private dependents, that is to say access types
88 -- or composite types whose designated types or component types are
89 -- subtypes or derived types of the private type in question. After the
90 -- full declaration has been seen, the private dependents are updated to
91 -- indicate that they have full definitions.
93 -----------------------
94 -- Local Subprograms --
95 -----------------------
97 procedure Analyze_Package_Body_Helper (N : Node_Id);
98 -- Does all the real work of Analyze_Package_Body
100 procedure Check_Anonymous_Access_Types
101 (Spec_Id : Entity_Id;
103 -- If the spec of a package has a limited_with_clause, it may declare
104 -- anonymous access types whose designated type is a limited view, such an
105 -- anonymous access return type for a function. This access type cannot be
106 -- elaborated in the spec itself, but it may need an itype reference if it
107 -- is used within a nested scope. In that case the itype reference is
108 -- created at the beginning of the corresponding package body and inserted
109 -- before other body declarations.
111 procedure Install_Package_Entity (Id : Entity_Id);
112 -- Supporting procedure for Install_{Visible,Private}_Declarations. Places
113 -- one entity on its visibility chain, and recurses on the visible part if
114 -- the entity is an inner package.
116 function Is_Private_Base_Type (E : Entity_Id) return Boolean;
117 -- True for a private type that is not a subtype
119 function Is_Visible_Dependent (Dep : Entity_Id) return Boolean;
120 -- If the private dependent is a private type whose full view is derived
121 -- from the parent type, its full properties are revealed only if we are in
122 -- the immediate scope of the private dependent. Should this predicate be
123 -- tightened further???
125 procedure Declare_Inherited_Private_Subprograms (Id : Entity_Id);
126 -- Called upon entering the private part of a public child package and the
127 -- body of a nested package, to potentially declare certain inherited
128 -- subprograms that were inherited by types in the visible part, but whose
129 -- declaration was deferred because the parent operation was private and
130 -- not visible at that point. These subprograms are located by traversing
131 -- the visible part declarations looking for non-private type extensions
132 -- and then examining each of the primitive operations of such types to
133 -- find those that were inherited but declared with a special internal
134 -- name. Each such operation is now declared as an operation with a normal
135 -- name (using the name of the parent operation) and replaces the previous
136 -- implicit operation in the primitive operations list of the type. If the
137 -- inherited private operation has been overridden, then it's replaced by
138 -- the overriding operation.
140 procedure Unit_Requires_Body_Info (P : Entity_Id);
141 -- Outputs info messages showing why package specification P requires a
142 -- body. Caller has checked that the switch requesting this information
143 -- is set, and that the package does indeed require a body.
145 --------------------------
146 -- Analyze_Package_Body --
147 --------------------------
149 procedure Analyze_Package_Body (N : Node_Id) is
150 Loc : constant Source_Ptr := Sloc (N);
154 Write_Str ("==> package body ");
155 Write_Name (Chars (Defining_Entity (N)));
156 Write_Str (" from ");
157 Write_Location (Loc);
162 -- The real work is split out into the helper, so it can do "return;"
163 -- without skipping the debug output.
165 Analyze_Package_Body_Helper (N);
169 Write_Str ("<== package body ");
170 Write_Name (Chars (Defining_Entity (N)));
171 Write_Str (" from ");
172 Write_Location (Loc);
175 end Analyze_Package_Body;
177 -----------------------------------
178 -- Analyze_Package_Body_Contract --
179 -----------------------------------
181 procedure Analyze_Package_Body_Contract (Body_Id : Entity_Id) is
182 Spec_Id : constant Entity_Id := Spec_Entity (Body_Id);
183 Mode : SPARK_Mode_Type;
187 -- Due to the timing of contract analysis, delayed pragmas may be
188 -- subject to the wrong SPARK_Mode, usually that of the enclosing
189 -- context. To remedy this, restore the original SPARK_Mode of the
190 -- related package body.
192 Save_SPARK_Mode_And_Set (Body_Id, Mode);
194 Prag := Get_Pragma (Body_Id, Pragma_Refined_State);
196 -- The analysis of pragma Refined_State detects whether the spec has
197 -- abstract states available for refinement.
199 if Present (Prag) then
200 Analyze_Refined_State_In_Decl_Part (Prag);
202 -- State refinement is required when the package declaration defines at
203 -- least one abstract state. Null states are not considered. Refinement
204 -- is not envorced when SPARK checks are turned off.
206 elsif SPARK_Mode /= Off
207 and then Requires_State_Refinement (Spec_Id, Body_Id)
209 Error_Msg_N ("package & requires state refinement", Spec_Id);
212 -- Restore the SPARK_Mode of the enclosing context after all delayed
213 -- pragmas have been analyzed.
215 Restore_SPARK_Mode (Mode);
216 end Analyze_Package_Body_Contract;
218 ---------------------------------
219 -- Analyze_Package_Body_Helper --
220 ---------------------------------
222 procedure Analyze_Package_Body_Helper (N : Node_Id) is
226 Last_Spec_Entity : Entity_Id;
230 procedure Install_Composite_Operations (P : Entity_Id);
231 -- Composite types declared in the current scope may depend on types
232 -- that were private at the point of declaration, and whose full view
233 -- is now in scope. Indicate that the corresponding operations on the
234 -- composite type are available.
236 ----------------------------------
237 -- Install_Composite_Operations --
238 ----------------------------------
240 procedure Install_Composite_Operations (P : Entity_Id) is
244 Id := First_Entity (P);
245 while Present (Id) loop
247 and then (Is_Limited_Composite (Id)
248 or else Is_Private_Composite (Id))
249 and then No (Private_Component (Id))
251 Set_Is_Limited_Composite (Id, False);
252 Set_Is_Private_Composite (Id, False);
257 end Install_Composite_Operations;
259 -- Start of processing for Analyze_Package_Body_Helper
262 -- Find corresponding package specification, and establish the current
263 -- scope. The visible defining entity for the package is the defining
264 -- occurrence in the spec. On exit from the package body, all body
265 -- declarations are attached to the defining entity for the body, but
266 -- the later is never used for name resolution. In this fashion there
267 -- is only one visible entity that denotes the package.
269 -- Set Body_Id. Note that this will be reset to point to the generic
270 -- copy later on in the generic case.
272 Body_Id := Defining_Entity (N);
274 -- Body is body of package instantiation. Corresponding spec has already
277 if Present (Corresponding_Spec (N)) then
278 Spec_Id := Corresponding_Spec (N);
279 Pack_Decl := Unit_Declaration_Node (Spec_Id);
282 Spec_Id := Current_Entity_In_Scope (Defining_Entity (N));
284 if Present (Spec_Id) and then Is_Package_Or_Generic_Package (Spec_Id)
286 Pack_Decl := Unit_Declaration_Node (Spec_Id);
288 if Nkind (Pack_Decl) = N_Package_Renaming_Declaration then
289 Error_Msg_N ("cannot supply body for package renaming", N);
292 elsif Present (Corresponding_Body (Pack_Decl)) then
293 Error_Msg_N ("redefinition of package body", N);
298 Error_Msg_N ("missing specification for package body", N);
302 if Is_Package_Or_Generic_Package (Spec_Id)
303 and then (Scope (Spec_Id) = Standard_Standard
304 or else Is_Child_Unit (Spec_Id))
305 and then not Unit_Requires_Body (Spec_Id)
307 if Ada_Version = Ada_83 then
309 ("optional package body (not allowed in Ada 95)??", N);
311 Error_Msg_N ("spec of this package does not allow a body", N);
316 Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id));
317 Style.Check_Identifier (Body_Id, Spec_Id);
319 if Is_Child_Unit (Spec_Id) then
320 if Nkind (Parent (N)) /= N_Compilation_Unit then
322 ("body of child unit& cannot be an inner package", N, Spec_Id);
325 Set_Is_Child_Unit (Body_Id);
328 -- Generic package case
330 if Ekind (Spec_Id) = E_Generic_Package then
332 -- Disable expansion and perform semantic analysis on copy. The
333 -- unannotated body will be used in all instantiations.
335 Body_Id := Defining_Entity (N);
336 Set_Ekind (Body_Id, E_Package_Body);
337 Set_Scope (Body_Id, Scope (Spec_Id));
338 Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id));
339 Set_Body_Entity (Spec_Id, Body_Id);
340 Set_Spec_Entity (Body_Id, Spec_Id);
342 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
345 -- Once the contents of the generic copy and the template are
346 -- swapped, do the same for their respective aspect specifications.
348 Exchange_Aspects (N, New_N);
350 -- Update Body_Id to point to the copied node for the remainder of
353 Body_Id := Defining_Entity (N);
357 -- The Body_Id is that of the copied node in the generic case, the
358 -- current node otherwise. Note that N was rewritten above, so we must
359 -- be sure to get the latest Body_Id value.
361 Set_Ekind (Body_Id, E_Package_Body);
362 Set_Body_Entity (Spec_Id, Body_Id);
363 Set_Spec_Entity (Body_Id, Spec_Id);
364 Set_Contract (Body_Id, Make_Contract (Sloc (Body_Id)));
366 -- Defining name for the package body is not a visible entity: Only the
367 -- defining name for the declaration is visible.
369 Set_Etype (Body_Id, Standard_Void_Type);
370 Set_Scope (Body_Id, Scope (Spec_Id));
371 Set_Corresponding_Spec (N, Spec_Id);
372 Set_Corresponding_Body (Pack_Decl, Body_Id);
374 -- The body entity is not used for semantics or code generation, but
375 -- it is attached to the entity list of the enclosing scope to simplify
376 -- the listing of back-annotations for the types it main contain.
378 if Scope (Spec_Id) /= Standard_Standard then
379 Append_Entity (Body_Id, Scope (Spec_Id));
382 -- Indicate that we are currently compiling the body of the package
384 Set_In_Package_Body (Spec_Id);
385 Set_Has_Completion (Spec_Id);
386 Last_Spec_Entity := Last_Entity (Spec_Id);
388 if Has_Aspects (N) then
389 Analyze_Aspect_Specifications (N, Body_Id);
392 Push_Scope (Spec_Id);
394 -- Set SPARK_Mode only for non-generic package
396 if Ekind (Spec_Id) = E_Package then
398 -- Set SPARK_Mode from context
400 Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma);
401 Set_SPARK_Pragma_Inherited (Body_Id, True);
403 -- Set elaboration code SPARK mode the same for now
405 Set_SPARK_Aux_Pragma (Body_Id, SPARK_Pragma (Body_Id));
406 Set_SPARK_Aux_Pragma_Inherited (Body_Id, True);
409 Set_Categorization_From_Pragmas (N);
411 Install_Visible_Declarations (Spec_Id);
412 Install_Private_Declarations (Spec_Id);
413 Install_Private_With_Clauses (Spec_Id);
414 Install_Composite_Operations (Spec_Id);
416 Check_Anonymous_Access_Types (Spec_Id, N);
418 if Ekind (Spec_Id) = E_Generic_Package then
419 Set_Use (Generic_Formal_Declarations (Pack_Decl));
422 Set_Use (Visible_Declarations (Specification (Pack_Decl)));
423 Set_Use (Private_Declarations (Specification (Pack_Decl)));
425 -- This is a nested package, so it may be necessary to declare certain
426 -- inherited subprograms that are not yet visible because the parent
427 -- type's subprograms are now visible.
429 if Ekind (Scope (Spec_Id)) = E_Package
430 and then Scope (Spec_Id) /= Standard_Standard
432 Declare_Inherited_Private_Subprograms (Spec_Id);
435 if Present (Declarations (N)) then
436 Analyze_Declarations (Declarations (N));
437 Inspect_Deferred_Constant_Completion (Declarations (N));
440 -- Verify that the SPARK_Mode of the body agrees with that of its spec
442 if Present (SPARK_Pragma (Body_Id)) then
443 if Present (SPARK_Aux_Pragma (Spec_Id)) then
444 if Get_SPARK_Mode_From_Pragma (SPARK_Aux_Pragma (Spec_Id)) = Off
446 Get_SPARK_Mode_From_Pragma (SPARK_Pragma (Body_Id)) = On
448 Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id));
449 Error_Msg_N ("incorrect application of SPARK_Mode#", N);
450 Error_Msg_Sloc := Sloc (SPARK_Aux_Pragma (Spec_Id));
452 ("\value Off was set for SPARK_Mode on & #", N, Spec_Id);
456 Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id));
457 Error_Msg_N ("incorrect application of SPARK_Mode#", N);
458 Error_Msg_Sloc := Sloc (Spec_Id);
460 ("\no value was set for SPARK_Mode on & #", N, Spec_Id);
464 -- Analyze_Declarations has caused freezing of all types. Now generate
465 -- bodies for RACW primitives and stream attributes, if any.
467 if Ekind (Spec_Id) = E_Package and then Has_RACW (Spec_Id) then
469 -- Attach subprogram bodies to support RACWs declared in spec
471 Append_RACW_Bodies (Declarations (N), Spec_Id);
472 Analyze_List (Declarations (N));
475 HSS := Handled_Statement_Sequence (N);
477 if Present (HSS) then
478 Process_End_Label (HSS, 't', Spec_Id);
481 -- Check that elaboration code in a preelaborable package body is
482 -- empty other than null statements and labels (RM 10.2.1(6)).
484 Validate_Null_Statement_Sequence (N);
487 Validate_Categorization_Dependency (N, Spec_Id);
488 Check_Completion (Body_Id);
490 -- Generate start of body reference. Note that we do this fairly late,
491 -- because the call will use In_Extended_Main_Source_Unit as a check,
492 -- and we want to make sure that Corresponding_Stub links are set
494 Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False);
496 -- For a generic package, collect global references and mark them on
497 -- the original body so that they are not resolved again at the point
500 if Ekind (Spec_Id) /= E_Package then
501 Save_Global_References (Original_Node (N));
505 -- The entities of the package body have so far been chained onto the
506 -- declaration chain for the spec. That's been fine while we were in the
507 -- body, since we wanted them to be visible, but now that we are leaving
508 -- the package body, they are no longer visible, so we remove them from
509 -- the entity chain of the package spec entity, and copy them to the
510 -- entity chain of the package body entity, where they will never again
513 if Present (Last_Spec_Entity) then
514 Set_First_Entity (Body_Id, Next_Entity (Last_Spec_Entity));
515 Set_Next_Entity (Last_Spec_Entity, Empty);
516 Set_Last_Entity (Body_Id, Last_Entity (Spec_Id));
517 Set_Last_Entity (Spec_Id, Last_Spec_Entity);
520 Set_First_Entity (Body_Id, First_Entity (Spec_Id));
521 Set_Last_Entity (Body_Id, Last_Entity (Spec_Id));
522 Set_First_Entity (Spec_Id, Empty);
523 Set_Last_Entity (Spec_Id, Empty);
526 End_Package_Scope (Spec_Id);
528 -- All entities declared in body are not visible
534 E := First_Entity (Body_Id);
535 while Present (E) loop
536 Set_Is_Immediately_Visible (E, False);
537 Set_Is_Potentially_Use_Visible (E, False);
540 -- Child units may appear on the entity list (e.g. if they appear
541 -- in the context of a subunit) but they are not body entities.
543 if not Is_Child_Unit (E) then
544 Set_Is_Package_Body_Entity (E);
551 Check_References (Body_Id);
553 -- For a generic unit, check that the formal parameters are referenced,
554 -- and that local variables are used, as for regular packages.
556 if Ekind (Spec_Id) = E_Generic_Package then
557 Check_References (Spec_Id);
560 -- The processing so far has made all entities of the package body
561 -- public (i.e. externally visible to the linker). This is in general
562 -- necessary, since inlined or generic bodies, for which code is
563 -- generated in other units, may need to see these entities. The
564 -- following loop runs backwards from the end of the entities of the
565 -- package body making these entities invisible until we reach a
566 -- referencer, i.e. a declaration that could reference a previous
567 -- declaration, a generic body or an inlined body, or a stub (which may
568 -- contain either of these). This is of course an approximation, but it
569 -- is conservative and definitely correct.
571 -- We only do this at the outer (library) level non-generic packages.
572 -- The reason is simply to cut down on the number of global symbols
573 -- generated, which has a double effect: (1) to make the compilation
574 -- process more efficient and (2) to give the code generator more
575 -- freedom to optimize within each unit, especially subprograms.
577 if (Scope (Spec_Id) = Standard_Standard or else Is_Child_Unit (Spec_Id))
578 and then not Is_Generic_Unit (Spec_Id)
579 and then Present (Declarations (N))
581 Make_Non_Public_Where_Possible : declare
583 function Has_Referencer
585 Outer : Boolean) return Boolean;
586 -- Traverse given list of declarations in reverse order. Return
587 -- True if a referencer is present. Return False if none is found.
589 -- The Outer parameter is True for the outer level call and False
590 -- for inner level calls for nested packages. If Outer is True,
591 -- then any entities up to the point of hitting a referencer get
592 -- their Is_Public flag cleared, so that the entities will be
593 -- treated as static entities in the C sense, and need not have
594 -- fully qualified names. Furthermore, if the referencer is an
595 -- inlined subprogram that doesn't reference other subprograms,
596 -- we keep clearing the Is_Public flag on subprograms. For inner
597 -- levels, we need all names to be fully qualified to deal with
598 -- the same name appearing in parallel packages (right now this
599 -- is tied to their being external).
605 function Has_Referencer
607 Outer : Boolean) return Boolean
609 Has_Referencer_Except_For_Subprograms : Boolean := False;
616 function Check_Subprogram_Ref (N : Node_Id)
617 return Traverse_Result;
618 -- Look for references to subprograms
620 --------------------------
621 -- Check_Subprogram_Ref --
622 --------------------------
624 function Check_Subprogram_Ref (N : Node_Id)
625 return Traverse_Result
630 -- Check name of procedure or function calls
632 if Nkind (N) in N_Subprogram_Call
633 and then Is_Entity_Name (Name (N))
638 -- Check prefix of attribute references
640 if Nkind (N) = N_Attribute_Reference
641 and then Is_Entity_Name (Prefix (N))
642 and then Present (Entity (Prefix (N)))
643 and then Ekind (Entity (Prefix (N))) in Subprogram_Kind
648 -- Check value of constants
650 if Nkind (N) = N_Identifier
651 and then Present (Entity (N))
652 and then Ekind (Entity (N)) = E_Constant
654 V := Constant_Value (Entity (N));
657 and then not Compile_Time_Known_Value_Or_Aggr (V)
664 end Check_Subprogram_Ref;
666 function Check_Subprogram_Refs is
667 new Traverse_Func (Check_Subprogram_Ref);
669 -- Start of processing for Has_Referencer
677 while Present (D) loop
680 if K in N_Body_Stub then
683 -- Processing for subprogram bodies
685 elsif K = N_Subprogram_Body then
686 if Acts_As_Spec (D) then
687 E := Defining_Entity (D);
689 -- An inlined body acts as a referencer. Note also
690 -- that we never reset Is_Public for an inlined
691 -- subprogram. Gigi requires Is_Public to be set.
693 -- Note that we test Has_Pragma_Inline here rather
694 -- than Is_Inlined. We are compiling this for a
695 -- client, and it is the client who will decide if
696 -- actual inlining should occur, so we need to assume
697 -- that the procedure could be inlined for the purpose
698 -- of accessing global entities.
700 if Has_Pragma_Inline (E) then
701 if Outer and then Check_Subprogram_Refs (D) = OK
703 Has_Referencer_Except_For_Subprograms := True;
708 Set_Is_Public (E, False);
712 E := Corresponding_Spec (D);
716 -- A generic subprogram body acts as a referencer
718 if Is_Generic_Unit (E) then
722 if Has_Pragma_Inline (E) or else Is_Inlined (E) then
723 if Outer and then Check_Subprogram_Refs (D) = OK
725 Has_Referencer_Except_For_Subprograms := True;
733 -- Processing for package bodies
735 elsif K = N_Package_Body
736 and then Present (Corresponding_Spec (D))
738 E := Corresponding_Spec (D);
740 -- Generic package body is a referencer. It would seem
741 -- that we only have to consider generics that can be
742 -- exported, i.e. where the corresponding spec is the
743 -- spec of the current package, but because of nested
744 -- instantiations, a fully private generic body may
745 -- export other private body entities. Furthermore,
746 -- regardless of whether there was a previous inlined
747 -- subprogram, (an instantiation of) the generic package
748 -- may reference any entity declared before it.
750 if Is_Generic_Unit (E) then
753 -- For non-generic package body, recurse into body unless
754 -- this is an instance, we ignore instances since they
755 -- cannot have references that affect outer entities.
757 elsif not Is_Generic_Instance (E)
758 and then not Has_Referencer_Except_For_Subprograms
761 (Declarations (D), Outer => False)
767 -- Processing for package specs, recurse into declarations.
768 -- Again we skip this for the case of generic instances.
770 elsif K = N_Package_Declaration
771 and then not Has_Referencer_Except_For_Subprograms
773 S := Specification (D);
775 if not Is_Generic_Unit (Defining_Entity (S)) then
777 (Private_Declarations (S), Outer => False)
781 (Visible_Declarations (S), Outer => False)
787 -- Objects and exceptions need not be public if we have not
788 -- encountered a referencer so far. We only reset the flag
789 -- for outer level entities that are not imported/exported,
790 -- and which have no interface name.
792 elsif Nkind_In (K, N_Object_Declaration,
793 N_Exception_Declaration,
794 N_Subprogram_Declaration)
796 E := Defining_Entity (D);
799 and then (not Has_Referencer_Except_For_Subprograms
800 or else K = N_Subprogram_Declaration)
801 and then not Is_Imported (E)
802 and then not Is_Exported (E)
803 and then No (Interface_Name (E))
805 Set_Is_Public (E, False);
812 return Has_Referencer_Except_For_Subprograms;
815 -- Start of processing for Make_Non_Public_Where_Possible
820 pragma Warnings (Off, Discard);
823 Discard := Has_Referencer (Declarations (N), Outer => True);
825 end Make_Non_Public_Where_Possible;
828 -- If expander is not active, then here is where we turn off the
829 -- In_Package_Body flag, otherwise it is turned off at the end of the
830 -- corresponding expansion routine. If this is an instance body, we need
831 -- to qualify names of local entities, because the body may have been
832 -- compiled as a preliminary to another instantiation.
834 if not Expander_Active then
835 Set_In_Package_Body (Spec_Id, False);
837 if Is_Generic_Instance (Spec_Id)
838 and then Operating_Mode = Generate_Code
840 Qualify_Entity_Names (N);
843 end Analyze_Package_Body_Helper;
845 ------------------------------
846 -- Analyze_Package_Contract --
847 ------------------------------
849 procedure Analyze_Package_Contract (Pack_Id : Entity_Id) is
850 Mode : SPARK_Mode_Type;
854 -- Due to the timing of contract analysis, delayed pragmas may be
855 -- subject to the wrong SPARK_Mode, usually that of the enclosing
856 -- context. To remedy this, restore the original SPARK_Mode of the
859 Save_SPARK_Mode_And_Set (Pack_Id, Mode);
861 -- Analyze the initialization related pragmas. Initializes must come
862 -- before Initial_Condition due to item dependencies.
864 Prag := Get_Pragma (Pack_Id, Pragma_Initializes);
866 if Present (Prag) then
867 Analyze_Initializes_In_Decl_Part (Prag);
870 Prag := Get_Pragma (Pack_Id, Pragma_Initial_Condition);
872 if Present (Prag) then
873 Analyze_Initial_Condition_In_Decl_Part (Prag);
876 -- Check whether the lack of indicator Part_Of agrees with the placement
877 -- of the package instantiation with respect to the state space.
879 if Is_Generic_Instance (Pack_Id) then
880 Prag := Get_Pragma (Pack_Id, Pragma_Part_Of);
883 Check_Missing_Part_Of (Pack_Id);
887 -- Restore the SPARK_Mode of the enclosing context after all delayed
888 -- pragmas have been analyzed.
890 Restore_SPARK_Mode (Mode);
891 end Analyze_Package_Contract;
893 ---------------------------------
894 -- Analyze_Package_Declaration --
895 ---------------------------------
897 procedure Analyze_Package_Declaration (N : Node_Id) is
898 Id : constant Node_Id := Defining_Entity (N);
901 -- True when in the context of a declared pure library unit
903 Body_Required : Boolean;
904 -- True when this package declaration requires a corresponding body
907 -- True when this package declaration is not a nested declaration
911 Write_Str ("==> package spec ");
912 Write_Name (Chars (Id));
913 Write_Str (" from ");
914 Write_Location (Sloc (N));
919 Generate_Definition (Id);
921 Set_Ekind (Id, E_Package);
922 Set_Etype (Id, Standard_Void_Type);
923 Set_Contract (Id, Make_Contract (Sloc (Id)));
925 -- Set SPARK_Mode from context only for non-generic package
927 if Ekind (Id) = E_Package then
928 Set_SPARK_Pragma (Id, SPARK_Mode_Pragma);
929 Set_SPARK_Aux_Pragma (Id, SPARK_Mode_Pragma);
930 Set_SPARK_Pragma_Inherited (Id, True);
931 Set_SPARK_Aux_Pragma_Inherited (Id, True);
934 -- Analyze aspect specifications immediately, since we need to recognize
935 -- things like Pure early enough to diagnose violations during analysis.
937 if Has_Aspects (N) then
938 Analyze_Aspect_Specifications (N, Id);
941 -- Ada 2005 (AI-217): Check if the package has been illegally named
942 -- in a limited-with clause of its own context. In this case the error
943 -- has been previously notified by Analyze_Context.
945 -- limited with Pkg; -- ERROR
946 -- package Pkg is ...
948 if From_Limited_With (Id) then
954 PF := Is_Pure (Enclosing_Lib_Unit_Entity);
955 Set_Is_Pure (Id, PF);
957 Set_Categorization_From_Pragmas (N);
959 Analyze (Specification (N));
960 Validate_Categorization_Dependency (N, Id);
962 Body_Required := Unit_Requires_Body (Id);
964 -- When this spec does not require an explicit body, we know that there
965 -- are no entities requiring completion in the language sense; we call
966 -- Check_Completion here only to ensure that any nested package
967 -- declaration that requires an implicit body gets one. (In the case
968 -- where a body is required, Check_Completion is called at the end of
969 -- the body's declarative part.)
971 if not Body_Required then
975 Comp_Unit := Nkind (Parent (N)) = N_Compilation_Unit;
978 -- Set Body_Required indication on the compilation unit node, and
979 -- determine whether elaboration warnings may be meaningful on it.
981 Set_Body_Required (Parent (N), Body_Required);
983 if not Body_Required then
984 Set_Suppress_Elaboration_Warnings (Id);
989 End_Package_Scope (Id);
991 -- For the declaration of a library unit that is a remote types package,
992 -- check legality rules regarding availability of stream attributes for
993 -- types that contain non-remote access values. This subprogram performs
994 -- visibility tests that rely on the fact that we have exited the scope
998 Validate_RT_RAT_Component (N);
1001 if Debug_Flag_C then
1003 Write_Str ("<== package spec ");
1004 Write_Name (Chars (Id));
1005 Write_Str (" from ");
1006 Write_Location (Sloc (N));
1009 end Analyze_Package_Declaration;
1011 -----------------------------------
1012 -- Analyze_Package_Specification --
1013 -----------------------------------
1015 -- Note that this code is shared for the analysis of generic package specs
1016 -- (see Sem_Ch12.Analyze_Generic_Package_Declaration for details).
1018 procedure Analyze_Package_Specification (N : Node_Id) is
1019 Id : constant Entity_Id := Defining_Entity (N);
1020 Orig_Decl : constant Node_Id := Original_Node (Parent (N));
1021 Vis_Decls : constant List_Id := Visible_Declarations (N);
1022 Priv_Decls : constant List_Id := Private_Declarations (N);
1025 Public_Child : Boolean;
1027 Private_With_Clauses_Installed : Boolean := False;
1028 -- In Ada 2005, private with_clauses are visible in the private part
1029 -- of a nested package, even if it appears in the public part of the
1030 -- enclosing package. This requires a separate step to install these
1031 -- private_with_clauses, and remove them at the end of the nested
1034 procedure Check_One_Tagged_Type_Or_Extension_At_Most;
1035 -- Issue an error in SPARK mode if a package specification contains
1036 -- more than one tagged type or type extension.
1038 procedure Clear_Constants (Id : Entity_Id; FE : Entity_Id);
1039 -- Clears constant indications (Never_Set_In_Source, Constant_Value, and
1040 -- Is_True_Constant) on all variables that are entities of Id, and on
1041 -- the chain whose first element is FE. A recursive call is made for all
1042 -- packages and generic packages.
1044 procedure Generate_Parent_References;
1045 -- For a child unit, generate references to parent units, for
1046 -- GPS navigation purposes.
1048 function Is_Public_Child (Child, Unit : Entity_Id) return Boolean;
1049 -- Child and Unit are entities of compilation units. True if Child
1050 -- is a public child of Parent as defined in 10.1.1
1052 procedure Inspect_Unchecked_Union_Completion (Decls : List_Id);
1053 -- Reject completion of an incomplete or private type declarations
1054 -- having a known discriminant part by an unchecked union.
1056 procedure Install_Parent_Private_Declarations (Inst_Id : Entity_Id);
1057 -- Given the package entity of a generic package instantiation or
1058 -- formal package whose corresponding generic is a child unit, installs
1059 -- the private declarations of each of the child unit's parents.
1060 -- This has to be done at the point of entering the instance package's
1061 -- private part rather than being done in Sem_Ch12.Install_Parent
1062 -- (which is where the parents' visible declarations are installed).
1064 ------------------------------------------------
1065 -- Check_One_Tagged_Type_Or_Extension_At_Most --
1066 ------------------------------------------------
1068 procedure Check_One_Tagged_Type_Or_Extension_At_Most is
1071 procedure Check_Decls (Decls : List_Id);
1072 -- Check that either Previous is Empty and Decls does not contain
1073 -- more than one tagged type or type extension, or Previous is
1074 -- already set and Decls contains no tagged type or type extension.
1080 procedure Check_Decls (Decls : List_Id) is
1084 Decl := First (Decls);
1085 while Present (Decl) loop
1086 if Nkind (Decl) = N_Full_Type_Declaration
1087 and then Is_Tagged_Type (Defining_Identifier (Decl))
1089 if No (Previous) then
1093 Error_Msg_Sloc := Sloc (Previous);
1094 Check_SPARK_05_Restriction
1095 ("at most one tagged type or type extension allowed",
1096 "\\ previous declaration#",
1105 -- Start of processing for Check_One_Tagged_Type_Or_Extension_At_Most
1109 Check_Decls (Vis_Decls);
1111 if Present (Priv_Decls) then
1112 Check_Decls (Priv_Decls);
1114 end Check_One_Tagged_Type_Or_Extension_At_Most;
1116 ---------------------
1117 -- Clear_Constants --
1118 ---------------------
1120 procedure Clear_Constants (Id : Entity_Id; FE : Entity_Id) is
1124 -- Ignore package renamings, not interesting and they can cause self
1125 -- referential loops in the code below.
1127 if Nkind (Parent (Id)) = N_Package_Renaming_Declaration then
1131 -- Note: in the loop below, the check for Next_Entity pointing back
1132 -- to the package entity may seem odd, but it is needed, because a
1133 -- package can contain a renaming declaration to itself, and such
1134 -- renamings are generated automatically within package instances.
1137 while Present (E) and then E /= Id loop
1138 if Is_Assignable (E) then
1139 Set_Never_Set_In_Source (E, False);
1140 Set_Is_True_Constant (E, False);
1141 Set_Current_Value (E, Empty);
1142 Set_Is_Known_Null (E, False);
1143 Set_Last_Assignment (E, Empty);
1145 if not Can_Never_Be_Null (E) then
1146 Set_Is_Known_Non_Null (E, False);
1149 elsif Is_Package_Or_Generic_Package (E) then
1150 Clear_Constants (E, First_Entity (E));
1151 Clear_Constants (E, First_Private_Entity (E));
1156 end Clear_Constants;
1158 --------------------------------
1159 -- Generate_Parent_References --
1160 --------------------------------
1162 procedure Generate_Parent_References is
1163 Decl : constant Node_Id := Parent (N);
1166 if Id = Cunit_Entity (Main_Unit)
1167 or else Parent (Decl) = Library_Unit (Cunit (Main_Unit))
1169 Generate_Reference (Id, Scope (Id), 'k', False);
1171 elsif not Nkind_In (Unit (Cunit (Main_Unit)), N_Subprogram_Body,
1174 -- If current unit is an ancestor of main unit, generate a
1175 -- reference to its own parent.
1179 Main_Spec : Node_Id := Unit (Cunit (Main_Unit));
1182 if Nkind (Main_Spec) = N_Package_Body then
1183 Main_Spec := Unit (Library_Unit (Cunit (Main_Unit)));
1186 U := Parent_Spec (Main_Spec);
1187 while Present (U) loop
1188 if U = Parent (Decl) then
1189 Generate_Reference (Id, Scope (Id), 'k', False);
1192 elsif Nkind (Unit (U)) = N_Package_Body then
1196 U := Parent_Spec (Unit (U));
1201 end Generate_Parent_References;
1203 ---------------------
1204 -- Is_Public_Child --
1205 ---------------------
1207 function Is_Public_Child (Child, Unit : Entity_Id) return Boolean is
1209 if not Is_Private_Descendant (Child) then
1212 if Child = Unit then
1213 return not Private_Present (
1214 Parent (Unit_Declaration_Node (Child)));
1216 return Is_Public_Child (Scope (Child), Unit);
1219 end Is_Public_Child;
1221 ----------------------------------------
1222 -- Inspect_Unchecked_Union_Completion --
1223 ----------------------------------------
1225 procedure Inspect_Unchecked_Union_Completion (Decls : List_Id) is
1229 Decl := First (Decls);
1230 while Present (Decl) loop
1232 -- We are looking at an incomplete or private type declaration
1233 -- with a known_discriminant_part whose full view is an
1236 if Nkind_In (Decl, N_Incomplete_Type_Declaration,
1237 N_Private_Type_Declaration)
1238 and then Has_Discriminants (Defining_Identifier (Decl))
1239 and then Present (Full_View (Defining_Identifier (Decl)))
1241 Is_Unchecked_Union (Full_View (Defining_Identifier (Decl)))
1244 ("completion of discriminated partial view "
1245 & "cannot be an unchecked union",
1246 Full_View (Defining_Identifier (Decl)));
1251 end Inspect_Unchecked_Union_Completion;
1253 -----------------------------------------
1254 -- Install_Parent_Private_Declarations --
1255 -----------------------------------------
1257 procedure Install_Parent_Private_Declarations (Inst_Id : Entity_Id) is
1258 Inst_Par : Entity_Id;
1259 Gen_Par : Entity_Id;
1260 Inst_Node : Node_Id;
1263 Inst_Par := Inst_Id;
1266 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
1267 while Present (Gen_Par) and then Is_Child_Unit (Gen_Par) loop
1268 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
1270 if Nkind_In (Inst_Node, N_Package_Instantiation,
1271 N_Formal_Package_Declaration)
1272 and then Nkind (Name (Inst_Node)) = N_Expanded_Name
1274 Inst_Par := Entity (Prefix (Name (Inst_Node)));
1276 if Present (Renamed_Entity (Inst_Par)) then
1277 Inst_Par := Renamed_Entity (Inst_Par);
1282 (Specification (Unit_Declaration_Node (Inst_Par)));
1284 -- Install the private declarations and private use clauses
1285 -- of a parent instance of the child instance, unless the
1286 -- parent instance private declarations have already been
1287 -- installed earlier in Analyze_Package_Specification, which
1288 -- happens when a generic child is instantiated, and the
1289 -- instance is a child of the parent instance.
1291 -- Installing the use clauses of the parent instance twice
1292 -- is both unnecessary and wrong, because it would cause the
1293 -- clauses to be chained to themselves in the use clauses
1294 -- list of the scope stack entry. That in turn would cause
1295 -- an endless loop from End_Use_Clauses upon scope exit.
1297 -- The parent is now fully visible. It may be a hidden open
1298 -- scope if we are currently compiling some child instance
1299 -- declared within it, but while the current instance is being
1300 -- compiled the parent is immediately visible. In particular
1301 -- its entities must remain visible if a stack save/restore
1302 -- takes place through a call to Rtsfind.
1304 if Present (Gen_Par) then
1305 if not In_Private_Part (Inst_Par) then
1306 Install_Private_Declarations (Inst_Par);
1307 Set_Use (Private_Declarations
1309 (Unit_Declaration_Node (Inst_Par))));
1310 Set_Is_Hidden_Open_Scope (Inst_Par, False);
1313 -- If we've reached the end of the generic instance parents,
1314 -- then finish off by looping through the nongeneric parents
1315 -- and installing their private declarations.
1317 -- If one of the non-generic parents is itself on the scope
1318 -- stack, do not install its private declarations: they are
1319 -- installed in due time when the private part of that parent
1320 -- is analyzed. This is delicate ???
1323 while Present (Inst_Par)
1324 and then Inst_Par /= Standard_Standard
1325 and then (not In_Open_Scopes (Inst_Par)
1326 or else not In_Private_Part (Inst_Par))
1328 Install_Private_Declarations (Inst_Par);
1329 Set_Use (Private_Declarations
1331 (Unit_Declaration_Node (Inst_Par))));
1332 Inst_Par := Scope (Inst_Par);
1342 end Install_Parent_Private_Declarations;
1344 -- Start of processing for Analyze_Package_Specification
1347 if Present (Vis_Decls) then
1348 Analyze_Declarations (Vis_Decls);
1351 -- Inspect the entities defined in the package and ensure that all
1352 -- incomplete types have received full declarations. Build default
1353 -- initial condition and invariant procedures for all qualifying types.
1355 E := First_Entity (Id);
1356 while Present (E) loop
1358 -- Check on incomplete types
1360 -- AI05-0213: A formal incomplete type has no completion
1362 if Ekind (E) = E_Incomplete_Type
1363 and then No (Full_View (E))
1364 and then not Is_Generic_Type (E)
1366 Error_Msg_N ("no declaration in visible part for incomplete}", E);
1371 -- Each private type subject to pragma Default_Initial_Condition
1372 -- declares a specialized procedure which verifies the assumption
1373 -- of the pragma. The declaration appears in the visible part of
1374 -- the package to allow for being called from the outside.
1376 if Has_Default_Init_Cond (E) then
1377 Build_Default_Init_Cond_Procedure_Declaration (E);
1379 -- A private extension inherits the default initial condition
1380 -- procedure from its parent type.
1382 elsif Has_Inherited_Default_Init_Cond (E) then
1383 Inherit_Default_Init_Cond_Procedure (E);
1386 if Has_Invariants (E) then
1387 if Ekind (E) = E_Private_Subtype then
1390 Build_Invariant_Procedure (E, N);
1398 if Is_Remote_Call_Interface (Id)
1399 and then Nkind (Parent (Parent (N))) = N_Compilation_Unit
1401 Validate_RCI_Declarations (Id);
1404 -- Save global references in the visible declarations, before installing
1405 -- private declarations of parent unit if there is one, because the
1406 -- privacy status of types defined in the parent will change. This is
1407 -- only relevant for generic child units, but is done in all cases for
1410 if Ekind (Id) = E_Generic_Package
1411 and then Nkind (Orig_Decl) = N_Generic_Package_Declaration
1414 Orig_Spec : constant Node_Id := Specification (Orig_Decl);
1415 Save_Priv : constant List_Id := Private_Declarations (Orig_Spec);
1417 Set_Private_Declarations (Orig_Spec, Empty_List);
1418 Save_Global_References (Orig_Decl);
1419 Set_Private_Declarations (Orig_Spec, Save_Priv);
1423 -- If package is a public child unit, then make the private declarations
1424 -- of the parent visible.
1426 Public_Child := False;
1430 Pack_Decl : Node_Id;
1435 Par_Spec := Parent_Spec (Parent (N));
1437 -- If the package is formal package of an enclosing generic, it is
1438 -- transformed into a local generic declaration, and compiled to make
1439 -- its spec available. We need to retrieve the original generic to
1440 -- determine whether it is a child unit, and install its parents.
1444 Nkind (Original_Node (Parent (N))) = N_Formal_Package_Declaration
1446 Par := Entity (Name (Original_Node (Parent (N))));
1447 Par_Spec := Parent_Spec (Unit_Declaration_Node (Par));
1450 if Present (Par_Spec) then
1451 Generate_Parent_References;
1453 while Scope (Par) /= Standard_Standard
1454 and then Is_Public_Child (Id, Par)
1455 and then In_Open_Scopes (Par)
1457 Public_Child := True;
1459 Install_Private_Declarations (Par);
1460 Install_Private_With_Clauses (Par);
1461 Pack_Decl := Unit_Declaration_Node (Par);
1462 Set_Use (Private_Declarations (Specification (Pack_Decl)));
1467 if Is_Compilation_Unit (Id) then
1468 Install_Private_With_Clauses (Id);
1471 -- The current compilation unit may include private with_clauses,
1472 -- which are visible in the private part of the current nested
1473 -- package, and have to be installed now. This is not done for
1474 -- nested instantiations, where the private with_clauses of the
1475 -- enclosing unit have no effect once the instantiation info is
1476 -- established and we start analyzing the package declaration.
1479 Comp_Unit : constant Entity_Id := Cunit_Entity (Current_Sem_Unit);
1481 if Is_Package_Or_Generic_Package (Comp_Unit)
1482 and then not In_Private_Part (Comp_Unit)
1483 and then not In_Instance
1485 Install_Private_With_Clauses (Comp_Unit);
1486 Private_With_Clauses_Installed := True;
1491 -- If this is a package associated with a generic instance or formal
1492 -- package, then the private declarations of each of the generic's
1493 -- parents must be installed at this point.
1495 if Is_Generic_Instance (Id) then
1496 Install_Parent_Private_Declarations (Id);
1499 -- Analyze private part if present. The flag In_Private_Part is reset
1500 -- in End_Package_Scope.
1502 L := Last_Entity (Id);
1504 if Present (Priv_Decls) then
1505 Set_In_Private_Part (Id);
1507 -- Upon entering a public child's private part, it may be necessary
1508 -- to declare subprograms that were derived in the package's visible
1509 -- part but not yet made visible.
1511 if Public_Child then
1512 Declare_Inherited_Private_Subprograms (Id);
1515 Analyze_Declarations (Priv_Decls);
1517 -- Check the private declarations for incomplete deferred constants
1519 Inspect_Deferred_Constant_Completion (Priv_Decls);
1521 -- The first private entity is the immediate follower of the last
1522 -- visible entity, if there was one.
1525 Set_First_Private_Entity (Id, Next_Entity (L));
1527 Set_First_Private_Entity (Id, First_Entity (Id));
1530 -- There may be inherited private subprograms that need to be declared,
1531 -- even in the absence of an explicit private part. If there are any
1532 -- public declarations in the package and the package is a public child
1533 -- unit, then an implicit private part is assumed.
1535 elsif Present (L) and then Public_Child then
1536 Set_In_Private_Part (Id);
1537 Declare_Inherited_Private_Subprograms (Id);
1538 Set_First_Private_Entity (Id, Next_Entity (L));
1541 E := First_Entity (Id);
1542 while Present (E) loop
1544 -- Check rule of 3.6(11), which in general requires waiting till all
1545 -- full types have been seen.
1547 if Ekind (E) = E_Record_Type or else Ekind (E) = E_Array_Type then
1548 Check_Aliased_Component_Types (E);
1551 -- Check preelaborable initialization for full type completing a
1552 -- private type for which pragma Preelaborable_Initialization given.
1555 and then Must_Have_Preelab_Init (E)
1556 and then not Has_Preelaborable_Initialization (E)
1559 ("full view of & does not have preelaborable initialization", E);
1562 -- An invariant may appear on a full view of a type
1565 and then Has_Private_Declaration (E)
1566 and then Nkind (Parent (E)) = N_Full_Type_Declaration
1567 and then Has_Aspects (Parent (E))
1573 ASN := First (Aspect_Specifications (Parent (E)));
1574 while Present (ASN) loop
1575 if Nam_In (Chars (Identifier (ASN)), Name_Invariant,
1576 Name_Type_Invariant)
1578 Build_Invariant_Procedure (E, N);
1590 -- Ada 2005 (AI-216): The completion of an incomplete or private type
1591 -- declaration having a known_discriminant_part shall not be an
1592 -- unchecked union type.
1594 if Present (Vis_Decls) then
1595 Inspect_Unchecked_Union_Completion (Vis_Decls);
1598 if Present (Priv_Decls) then
1599 Inspect_Unchecked_Union_Completion (Priv_Decls);
1602 if Ekind (Id) = E_Generic_Package
1603 and then Nkind (Orig_Decl) = N_Generic_Package_Declaration
1604 and then Present (Priv_Decls)
1606 -- Save global references in private declarations, ignoring the
1607 -- visible declarations that were processed earlier.
1610 Orig_Spec : constant Node_Id := Specification (Orig_Decl);
1611 Save_Vis : constant List_Id := Visible_Declarations (Orig_Spec);
1612 Save_Form : constant List_Id :=
1613 Generic_Formal_Declarations (Orig_Decl);
1616 Set_Visible_Declarations (Orig_Spec, Empty_List);
1617 Set_Generic_Formal_Declarations (Orig_Decl, Empty_List);
1618 Save_Global_References (Orig_Decl);
1619 Set_Generic_Formal_Declarations (Orig_Decl, Save_Form);
1620 Set_Visible_Declarations (Orig_Spec, Save_Vis);
1624 Process_End_Label (N, 'e', Id);
1626 -- Remove private_with_clauses of enclosing compilation unit, if they
1629 if Private_With_Clauses_Installed then
1630 Remove_Private_With_Clauses (Cunit (Current_Sem_Unit));
1633 -- For the case of a library level package, we must go through all the
1634 -- entities clearing the indications that the value may be constant and
1635 -- not modified. Why? Because any client of this package may modify
1636 -- these values freely from anywhere. This also applies to any nested
1637 -- packages or generic packages.
1639 -- For now we unconditionally clear constants for packages that are
1640 -- instances of generic packages. The reason is that we do not have the
1641 -- body yet, and we otherwise think things are unreferenced when they
1642 -- are not. This should be fixed sometime (the effect is not terrible,
1643 -- we just lose some warnings, and also some cases of value propagation)
1646 if Is_Library_Level_Entity (Id)
1647 or else Is_Generic_Instance (Id)
1649 Clear_Constants (Id, First_Entity (Id));
1650 Clear_Constants (Id, First_Private_Entity (Id));
1653 -- Issue an error in SPARK mode if a package specification contains
1654 -- more than one tagged type or type extension.
1656 Check_One_Tagged_Type_Or_Extension_At_Most;
1658 -- If switch set, output information on why body required
1660 if List_Body_Required_Info
1661 and then In_Extended_Main_Source_Unit (Id)
1662 and then Unit_Requires_Body (Id)
1664 Unit_Requires_Body_Info (Id);
1666 end Analyze_Package_Specification;
1668 --------------------------------------
1669 -- Analyze_Private_Type_Declaration --
1670 --------------------------------------
1672 procedure Analyze_Private_Type_Declaration (N : Node_Id) is
1673 PF : constant Boolean := Is_Pure (Enclosing_Lib_Unit_Entity);
1674 Id : constant Entity_Id := Defining_Identifier (N);
1677 Generate_Definition (Id);
1678 Set_Is_Pure (Id, PF);
1679 Init_Size_Align (Id);
1681 if not Is_Package_Or_Generic_Package (Current_Scope)
1682 or else In_Private_Part (Current_Scope)
1684 Error_Msg_N ("invalid context for private declaration", N);
1687 New_Private_Type (N, Id, N);
1688 Set_Depends_On_Private (Id);
1690 if Has_Aspects (N) then
1691 Analyze_Aspect_Specifications (N, Id);
1693 end Analyze_Private_Type_Declaration;
1695 ----------------------------------
1696 -- Check_Anonymous_Access_Types --
1697 ----------------------------------
1699 procedure Check_Anonymous_Access_Types
1700 (Spec_Id : Entity_Id;
1707 -- Itype references are only needed by gigi, to force elaboration of
1708 -- itypes. In the absence of code generation, they are not needed.
1710 if not Expander_Active then
1714 E := First_Entity (Spec_Id);
1715 while Present (E) loop
1716 if Ekind (E) = E_Anonymous_Access_Type
1717 and then From_Limited_With (E)
1719 IR := Make_Itype_Reference (Sloc (P_Body));
1722 if No (Declarations (P_Body)) then
1723 Set_Declarations (P_Body, New_List (IR));
1725 Prepend (IR, Declarations (P_Body));
1731 end Check_Anonymous_Access_Types;
1733 -------------------------------------------
1734 -- Declare_Inherited_Private_Subprograms --
1735 -------------------------------------------
1737 procedure Declare_Inherited_Private_Subprograms (Id : Entity_Id) is
1739 function Is_Primitive_Of (T : Entity_Id; S : Entity_Id) return Boolean;
1740 -- Check whether an inherited subprogram S is an operation of an
1741 -- untagged derived type T.
1743 ---------------------
1744 -- Is_Primitive_Of --
1745 ---------------------
1747 function Is_Primitive_Of (T : Entity_Id; S : Entity_Id) return Boolean is
1751 -- If the full view is a scalar type, the type is the anonymous base
1752 -- type, but the operation mentions the first subtype, so check the
1753 -- signature against the base type.
1755 if Base_Type (Etype (S)) = Base_Type (T) then
1759 Formal := First_Formal (S);
1760 while Present (Formal) loop
1761 if Base_Type (Etype (Formal)) = Base_Type (T) then
1765 Next_Formal (Formal);
1770 end Is_Primitive_Of;
1777 Op_Elmt_2 : Elmt_Id;
1778 Prim_Op : Entity_Id;
1779 New_Op : Entity_Id := Empty;
1780 Parent_Subp : Entity_Id;
1783 -- Start of processing for Declare_Inherited_Private_Subprograms
1786 E := First_Entity (Id);
1787 while Present (E) loop
1789 -- If the entity is a nonprivate type extension whose parent type
1790 -- is declared in an open scope, then the type may have inherited
1791 -- operations that now need to be made visible. Ditto if the entity
1792 -- is a formal derived type in a child unit.
1794 if ((Is_Derived_Type (E) and then not Is_Private_Type (E))
1796 (Nkind (Parent (E)) = N_Private_Extension_Declaration
1797 and then Is_Generic_Type (E)))
1798 and then In_Open_Scopes (Scope (Etype (E)))
1799 and then Is_Base_Type (E)
1801 if Is_Tagged_Type (E) then
1802 Op_List := Primitive_Operations (E);
1804 Tag := First_Tag_Component (E);
1806 Op_Elmt := First_Elmt (Op_List);
1807 while Present (Op_Elmt) loop
1808 Prim_Op := Node (Op_Elmt);
1810 -- Search primitives that are implicit operations with an
1811 -- internal name whose parent operation has a normal name.
1813 if Present (Alias (Prim_Op))
1814 and then Find_Dispatching_Type (Alias (Prim_Op)) /= E
1815 and then not Comes_From_Source (Prim_Op)
1816 and then Is_Internal_Name (Chars (Prim_Op))
1817 and then not Is_Internal_Name (Chars (Alias (Prim_Op)))
1819 Parent_Subp := Alias (Prim_Op);
1821 -- Case 1: Check if the type has also an explicit
1822 -- overriding for this primitive.
1824 Op_Elmt_2 := Next_Elmt (Op_Elmt);
1825 while Present (Op_Elmt_2) loop
1827 -- Skip entities with attribute Interface_Alias since
1828 -- they are not overriding primitives (these entities
1829 -- link an interface primitive with their covering
1832 if Chars (Node (Op_Elmt_2)) = Chars (Parent_Subp)
1833 and then Type_Conformant (Prim_Op, Node (Op_Elmt_2))
1834 and then No (Interface_Alias (Node (Op_Elmt_2)))
1836 -- The private inherited operation has been
1837 -- overridden by an explicit subprogram:
1838 -- replace the former by the latter.
1840 New_Op := Node (Op_Elmt_2);
1841 Replace_Elmt (Op_Elmt, New_Op);
1842 Remove_Elmt (Op_List, Op_Elmt_2);
1843 Set_Overridden_Operation (New_Op, Parent_Subp);
1845 -- We don't need to inherit its dispatching slot.
1846 -- Set_All_DT_Position has previously ensured that
1847 -- the same slot was assigned to the two primitives
1850 and then Present (DTC_Entity (New_Op))
1851 and then Present (DTC_Entity (Prim_Op))
1854 (DT_Position (New_Op) = DT_Position (Prim_Op));
1858 goto Next_Primitive;
1861 Next_Elmt (Op_Elmt_2);
1864 -- Case 2: We have not found any explicit overriding and
1865 -- hence we need to declare the operation (i.e., make it
1868 Derive_Subprogram (New_Op, Alias (Prim_Op), E, Etype (E));
1870 -- Inherit the dispatching slot if E is already frozen
1873 and then Present (DTC_Entity (Alias (Prim_Op)))
1875 Set_DTC_Entity_Value (E, New_Op);
1876 Set_DT_Position (New_Op,
1877 DT_Position (Alias (Prim_Op)));
1881 (Is_Dispatching_Operation (New_Op)
1882 and then Node (Last_Elmt (Op_List)) = New_Op);
1884 -- Substitute the new operation for the old one in the
1885 -- type's primitive operations list. Since the new
1886 -- operation was also just added to the end of list,
1887 -- the last element must be removed.
1889 -- (Question: is there a simpler way of declaring the
1890 -- operation, say by just replacing the name of the
1891 -- earlier operation, reentering it in the in the symbol
1892 -- table (how?), and marking it as private???)
1894 Replace_Elmt (Op_Elmt, New_Op);
1895 Remove_Last_Elmt (Op_List);
1899 Next_Elmt (Op_Elmt);
1902 -- Generate listing showing the contents of the dispatch table
1904 if Debug_Flag_ZZ then
1909 -- For untagged type, scan forward to locate inherited hidden
1912 Prim_Op := Next_Entity (E);
1913 while Present (Prim_Op) loop
1914 if Is_Subprogram (Prim_Op)
1915 and then Present (Alias (Prim_Op))
1916 and then not Comes_From_Source (Prim_Op)
1917 and then Is_Internal_Name (Chars (Prim_Op))
1918 and then not Is_Internal_Name (Chars (Alias (Prim_Op)))
1919 and then Is_Primitive_Of (E, Prim_Op)
1921 Derive_Subprogram (New_Op, Alias (Prim_Op), E, Etype (E));
1924 Next_Entity (Prim_Op);
1926 -- Derived operations appear immediately after the type
1927 -- declaration (or the following subtype indication for
1928 -- a derived scalar type). Further declarations cannot
1929 -- include inherited operations of the type.
1931 if Present (Prim_Op) then
1932 exit when Ekind (Prim_Op) not in Overloadable_Kind;
1940 end Declare_Inherited_Private_Subprograms;
1942 -----------------------
1943 -- End_Package_Scope --
1944 -----------------------
1946 procedure End_Package_Scope (P : Entity_Id) is
1948 Uninstall_Declarations (P);
1950 end End_Package_Scope;
1952 ---------------------------
1953 -- Exchange_Declarations --
1954 ---------------------------
1956 procedure Exchange_Declarations (Id : Entity_Id) is
1957 Full_Id : constant Entity_Id := Full_View (Id);
1958 H1 : constant Entity_Id := Homonym (Id);
1959 Next1 : constant Entity_Id := Next_Entity (Id);
1964 -- If missing full declaration for type, nothing to exchange
1966 if No (Full_Id) then
1970 -- Otherwise complete the exchange, and preserve semantic links
1972 Next2 := Next_Entity (Full_Id);
1973 H2 := Homonym (Full_Id);
1975 -- Reset full declaration pointer to reflect the switched entities and
1976 -- readjust the next entity chains.
1978 Exchange_Entities (Id, Full_Id);
1980 Set_Next_Entity (Id, Next1);
1981 Set_Homonym (Id, H1);
1983 Set_Full_View (Full_Id, Id);
1984 Set_Next_Entity (Full_Id, Next2);
1985 Set_Homonym (Full_Id, H2);
1986 end Exchange_Declarations;
1988 ----------------------------
1989 -- Install_Package_Entity --
1990 ----------------------------
1992 procedure Install_Package_Entity (Id : Entity_Id) is
1994 if not Is_Internal (Id) then
1995 if Debug_Flag_E then
1996 Write_Str ("Install: ");
1997 Write_Name (Chars (Id));
2001 if Is_Child_Unit (Id) then
2004 -- Do not enter implicitly inherited non-overridden subprograms of
2005 -- a tagged type back into visibility if they have non-conformant
2006 -- homographs (Ada RM 8.3 12.3/2).
2008 elsif Is_Hidden_Non_Overridden_Subpgm (Id) then
2012 Set_Is_Immediately_Visible (Id);
2015 end Install_Package_Entity;
2017 ----------------------------------
2018 -- Install_Private_Declarations --
2019 ----------------------------------
2021 procedure Install_Private_Declarations (P : Entity_Id) is
2024 Priv_Deps : Elist_Id;
2026 procedure Swap_Private_Dependents (Priv_Deps : Elist_Id);
2027 -- When the full view of a private type is made available, we do the
2028 -- same for its private dependents under proper visibility conditions.
2029 -- When compiling a grand-chid unit this needs to be done recursively.
2031 -----------------------------
2032 -- Swap_Private_Dependents --
2033 -----------------------------
2035 procedure Swap_Private_Dependents (Priv_Deps : Elist_Id) is
2038 Priv_Elmt : Elmt_Id;
2042 Priv_Elmt := First_Elmt (Priv_Deps);
2043 while Present (Priv_Elmt) loop
2044 Priv := Node (Priv_Elmt);
2046 -- Before the exchange, verify that the presence of the Full_View
2047 -- field. This field will be empty if the entity has already been
2048 -- installed due to a previous call.
2050 if Present (Full_View (Priv)) and then Is_Visible_Dependent (Priv)
2052 if Is_Private_Type (Priv) then
2053 Deps := Private_Dependents (Priv);
2059 -- For each subtype that is swapped, we also swap the reference
2060 -- to it in Private_Dependents, to allow access to it when we
2061 -- swap them out in End_Package_Scope.
2063 Replace_Elmt (Priv_Elmt, Full_View (Priv));
2064 Exchange_Declarations (Priv);
2065 Set_Is_Immediately_Visible
2066 (Priv, In_Open_Scopes (Scope (Priv)));
2067 Set_Is_Potentially_Use_Visible
2068 (Priv, Is_Potentially_Use_Visible (Node (Priv_Elmt)));
2070 -- Within a child unit, recurse, except in generic child unit,
2071 -- which (unfortunately) handle private_dependents separately.
2074 and then Is_Child_Unit (Cunit_Entity (Current_Sem_Unit))
2075 and then not Is_Empty_Elmt_List (Deps)
2076 and then not Inside_A_Generic
2078 Swap_Private_Dependents (Deps);
2082 Next_Elmt (Priv_Elmt);
2084 end Swap_Private_Dependents;
2086 -- Start of processing for Install_Private_Declarations
2089 -- First exchange declarations for private types, so that the full
2090 -- declaration is visible. For each private type, we check its
2091 -- Private_Dependents list and also exchange any subtypes of or derived
2092 -- types from it. Finally, if this is a Taft amendment type, the
2093 -- incomplete declaration is irrelevant, and we want to link the
2094 -- eventual full declaration with the original private one so we
2095 -- also skip the exchange.
2097 Id := First_Entity (P);
2098 while Present (Id) and then Id /= First_Private_Entity (P) loop
2099 if Is_Private_Base_Type (Id)
2100 and then Present (Full_View (Id))
2101 and then Comes_From_Source (Full_View (Id))
2102 and then Scope (Full_View (Id)) = Scope (Id)
2103 and then Ekind (Full_View (Id)) /= E_Incomplete_Type
2105 -- If there is a use-type clause on the private type, set the full
2106 -- view accordingly.
2108 Set_In_Use (Full_View (Id), In_Use (Id));
2109 Full := Full_View (Id);
2111 if Is_Private_Base_Type (Full)
2112 and then Has_Private_Declaration (Full)
2113 and then Nkind (Parent (Full)) = N_Full_Type_Declaration
2114 and then In_Open_Scopes (Scope (Etype (Full)))
2115 and then In_Package_Body (Current_Scope)
2116 and then not Is_Private_Type (Etype (Full))
2118 -- This is the completion of a private type by a derivation
2119 -- from another private type which is not private anymore. This
2120 -- can only happen in a package nested within a child package,
2121 -- when the parent type is defined in the parent unit. At this
2122 -- point the current type is not private either, and we have
2123 -- to install the underlying full view, which is now visible.
2124 -- Save the current full view as well, so that all views can be
2125 -- restored on exit. It may seem that after compiling the child
2126 -- body there are not environments to restore, but the back-end
2127 -- expects those links to be valid, and freeze nodes depend on
2130 if No (Full_View (Full))
2131 and then Present (Underlying_Full_View (Full))
2133 Set_Full_View (Id, Underlying_Full_View (Full));
2134 Set_Underlying_Full_View (Id, Full);
2136 Set_Underlying_Full_View (Full, Empty);
2137 Set_Is_Frozen (Full_View (Id));
2141 Priv_Deps := Private_Dependents (Id);
2142 Exchange_Declarations (Id);
2143 Set_Is_Immediately_Visible (Id);
2144 Swap_Private_Dependents (Priv_Deps);
2150 -- Next make other declarations in the private part visible as well
2152 Id := First_Private_Entity (P);
2153 while Present (Id) loop
2154 Install_Package_Entity (Id);
2155 Set_Is_Hidden (Id, False);
2159 -- Indicate that the private part is currently visible, so it can be
2160 -- properly reset on exit.
2162 Set_In_Private_Part (P);
2163 end Install_Private_Declarations;
2165 ----------------------------------
2166 -- Install_Visible_Declarations --
2167 ----------------------------------
2169 procedure Install_Visible_Declarations (P : Entity_Id) is
2171 Last_Entity : Entity_Id;
2175 (Is_Package_Or_Generic_Package (P) or else Is_Record_Type (P));
2177 if Is_Package_Or_Generic_Package (P) then
2178 Last_Entity := First_Private_Entity (P);
2180 Last_Entity := Empty;
2183 Id := First_Entity (P);
2184 while Present (Id) and then Id /= Last_Entity loop
2185 Install_Package_Entity (Id);
2188 end Install_Visible_Declarations;
2190 --------------------------
2191 -- Is_Private_Base_Type --
2192 --------------------------
2194 function Is_Private_Base_Type (E : Entity_Id) return Boolean is
2196 return Ekind (E) = E_Private_Type
2197 or else Ekind (E) = E_Limited_Private_Type
2198 or else Ekind (E) = E_Record_Type_With_Private;
2199 end Is_Private_Base_Type;
2201 --------------------------
2202 -- Is_Visible_Dependent --
2203 --------------------------
2205 function Is_Visible_Dependent (Dep : Entity_Id) return Boolean
2207 S : constant Entity_Id := Scope (Dep);
2210 -- Renamings created for actual types have the visibility of the actual
2212 if Ekind (S) = E_Package
2213 and then Is_Generic_Instance (S)
2214 and then (Is_Generic_Actual_Type (Dep)
2215 or else Is_Generic_Actual_Type (Full_View (Dep)))
2219 elsif not (Is_Derived_Type (Dep))
2220 and then Is_Derived_Type (Full_View (Dep))
2222 -- When instantiating a package body, the scope stack is empty, so
2223 -- check instead whether the dependent type is defined in the same
2224 -- scope as the instance itself.
2226 return In_Open_Scopes (S)
2227 or else (Is_Generic_Instance (Current_Scope)
2228 and then Scope (Dep) = Scope (Current_Scope));
2232 end Is_Visible_Dependent;
2234 ----------------------------
2235 -- May_Need_Implicit_Body --
2236 ----------------------------
2238 procedure May_Need_Implicit_Body (E : Entity_Id) is
2239 P : constant Node_Id := Unit_Declaration_Node (E);
2240 S : constant Node_Id := Parent (P);
2245 if not Has_Completion (E)
2246 and then Nkind (P) = N_Package_Declaration
2247 and then (Present (Activation_Chain_Entity (P)) or else Has_RACW (E))
2250 Make_Package_Body (Sloc (E),
2251 Defining_Unit_Name => Make_Defining_Identifier (Sloc (E),
2252 Chars => Chars (E)),
2253 Declarations => New_List);
2255 if Nkind (S) = N_Package_Specification then
2256 if Present (Private_Declarations (S)) then
2257 Decls := Private_Declarations (S);
2259 Decls := Visible_Declarations (S);
2262 Decls := Declarations (S);
2268 end May_Need_Implicit_Body;
2270 ----------------------
2271 -- New_Private_Type --
2272 ----------------------
2274 procedure New_Private_Type (N : Node_Id; Id : Entity_Id; Def : Node_Id) is
2276 -- For other than Ada 2012, enter the name in the current scope
2278 if Ada_Version < Ada_2012 then
2281 -- Ada 2012 (AI05-0162): Enter the name in the current scope. Note that
2282 -- there may be an incomplete previous view.
2288 Prev := Find_Type_Name (N);
2289 pragma Assert (Prev = Id
2290 or else (Ekind (Prev) = E_Incomplete_Type
2291 and then Present (Full_View (Prev))
2292 and then Full_View (Prev) = Id));
2296 if Limited_Present (Def) then
2297 Set_Ekind (Id, E_Limited_Private_Type);
2299 Set_Ekind (Id, E_Private_Type);
2303 Set_Has_Delayed_Freeze (Id);
2304 Set_Is_First_Subtype (Id);
2305 Init_Size_Align (Id);
2307 Set_Is_Constrained (Id,
2308 No (Discriminant_Specifications (N))
2309 and then not Unknown_Discriminants_Present (N));
2311 -- Set tagged flag before processing discriminants, to catch illegal
2314 Set_Is_Tagged_Type (Id, Tagged_Present (Def));
2316 Set_Discriminant_Constraint (Id, No_Elist);
2317 Set_Stored_Constraint (Id, No_Elist);
2319 if Present (Discriminant_Specifications (N)) then
2321 Process_Discriminants (N);
2324 elsif Unknown_Discriminants_Present (N) then
2325 Set_Has_Unknown_Discriminants (Id);
2328 Set_Private_Dependents (Id, New_Elmt_List);
2330 if Tagged_Present (Def) then
2331 Set_Ekind (Id, E_Record_Type_With_Private);
2332 Set_Direct_Primitive_Operations (Id, New_Elmt_List);
2333 Set_Is_Abstract_Type (Id, Abstract_Present (Def));
2334 Set_Is_Limited_Record (Id, Limited_Present (Def));
2335 Set_Has_Delayed_Freeze (Id, True);
2337 -- Create a class-wide type with the same attributes
2339 Make_Class_Wide_Type (Id);
2341 elsif Abstract_Present (Def) then
2342 Error_Msg_N ("only a tagged type can be abstract", N);
2344 end New_Private_Type;
2346 ----------------------------
2347 -- Uninstall_Declarations --
2348 ----------------------------
2350 procedure Uninstall_Declarations (P : Entity_Id) is
2351 Decl : constant Node_Id := Unit_Declaration_Node (P);
2354 Priv_Elmt : Elmt_Id;
2355 Priv_Sub : Entity_Id;
2357 procedure Preserve_Full_Attributes (Priv, Full : Entity_Id);
2358 -- Copy to the private declaration the attributes of the full view that
2359 -- need to be available for the partial view also.
2361 function Type_In_Use (T : Entity_Id) return Boolean;
2362 -- Check whether type or base type appear in an active use_type clause
2364 ------------------------------
2365 -- Preserve_Full_Attributes --
2366 ------------------------------
2368 procedure Preserve_Full_Attributes (Priv, Full : Entity_Id) is
2369 Priv_Is_Base_Type : constant Boolean := Is_Base_Type (Priv);
2372 Set_Size_Info (Priv, (Full));
2373 Set_RM_Size (Priv, RM_Size (Full));
2374 Set_Size_Known_At_Compile_Time
2375 (Priv, Size_Known_At_Compile_Time (Full));
2376 Set_Is_Volatile (Priv, Is_Volatile (Full));
2377 Set_Treat_As_Volatile (Priv, Treat_As_Volatile (Full));
2378 Set_Is_Ada_2005_Only (Priv, Is_Ada_2005_Only (Full));
2379 Set_Is_Ada_2012_Only (Priv, Is_Ada_2012_Only (Full));
2380 Set_Has_Pragma_Unmodified (Priv, Has_Pragma_Unmodified (Full));
2381 Set_Has_Pragma_Unreferenced (Priv, Has_Pragma_Unreferenced (Full));
2382 Set_Has_Pragma_Unreferenced_Objects
2383 (Priv, Has_Pragma_Unreferenced_Objects
2385 if Is_Unchecked_Union (Full) then
2386 Set_Is_Unchecked_Union (Base_Type (Priv));
2388 -- Why is atomic not copied here ???
2390 if Referenced (Full) then
2391 Set_Referenced (Priv);
2394 if Priv_Is_Base_Type then
2395 Set_Is_Controlled (Priv, Is_Controlled (Base_Type (Full)));
2396 Set_Finalize_Storage_Only
2397 (Priv, Finalize_Storage_Only
2398 (Base_Type (Full)));
2399 Set_Has_Task (Priv, Has_Task (Base_Type (Full)));
2400 Set_Has_Protected (Priv, Has_Protected (Base_Type (Full)));
2401 Set_Has_Controlled_Component
2402 (Priv, Has_Controlled_Component
2403 (Base_Type (Full)));
2406 Set_Freeze_Node (Priv, Freeze_Node (Full));
2408 -- Propagate information of type invariants, which may be specified
2409 -- for the full view.
2411 if Has_Invariants (Full) and not Has_Invariants (Priv) then
2412 Set_Has_Invariants (Priv);
2413 Set_Subprograms_For_Type (Priv, Subprograms_For_Type (Full));
2416 if Is_Tagged_Type (Priv)
2417 and then Is_Tagged_Type (Full)
2418 and then not Error_Posted (Full)
2420 if Is_Tagged_Type (Priv) then
2422 -- If the type is tagged, the tag itself must be available on
2423 -- the partial view, for expansion purposes.
2425 Set_First_Entity (Priv, First_Entity (Full));
2427 -- If there are discriminants in the partial view, these remain
2428 -- visible. Otherwise only the tag itself is visible, and there
2429 -- are no nameable components in the partial view.
2431 if No (Last_Entity (Priv)) then
2432 Set_Last_Entity (Priv, First_Entity (Priv));
2436 Set_Has_Discriminants (Priv, Has_Discriminants (Full));
2438 if Has_Discriminants (Full) then
2439 Set_Discriminant_Constraint (Priv,
2440 Discriminant_Constraint (Full));
2443 end Preserve_Full_Attributes;
2449 function Type_In_Use (T : Entity_Id) return Boolean is
2451 return Scope (Base_Type (T)) = P
2452 and then (In_Use (T) or else In_Use (Base_Type (T)));
2455 -- Start of processing for Uninstall_Declarations
2458 Id := First_Entity (P);
2459 while Present (Id) and then Id /= First_Private_Entity (P) loop
2460 if Debug_Flag_E then
2461 Write_Str ("unlinking visible entity ");
2462 Write_Int (Int (Id));
2466 -- On exit from the package scope, we must preserve the visibility
2467 -- established by use clauses in the current scope. Two cases:
2469 -- a) If the entity is an operator, it may be a primitive operator of
2470 -- a type for which there is a visible use-type clause.
2472 -- b) for other entities, their use-visibility is determined by a
2473 -- visible use clause for the package itself. For a generic instance,
2474 -- the instantiation of the formals appears in the visible part,
2475 -- but the formals are private and remain so.
2477 if Ekind (Id) = E_Function
2478 and then Is_Operator_Symbol_Name (Chars (Id))
2479 and then not Is_Hidden (Id)
2480 and then not Error_Posted (Id)
2482 Set_Is_Potentially_Use_Visible (Id,
2484 or else Type_In_Use (Etype (Id))
2485 or else Type_In_Use (Etype (First_Formal (Id)))
2486 or else (Present (Next_Formal (First_Formal (Id)))
2489 (Etype (Next_Formal (First_Formal (Id))))));
2491 if In_Use (P) and then not Is_Hidden (Id) then
2493 -- A child unit of a use-visible package remains use-visible
2494 -- only if it is itself a visible child unit. Otherwise it
2495 -- would remain visible in other contexts where P is use-
2496 -- visible, because once compiled it stays in the entity list
2497 -- of its parent unit.
2499 if Is_Child_Unit (Id) then
2500 Set_Is_Potentially_Use_Visible
2501 (Id, Is_Visible_Lib_Unit (Id));
2503 Set_Is_Potentially_Use_Visible (Id);
2507 Set_Is_Potentially_Use_Visible (Id, False);
2511 -- Local entities are not immediately visible outside of the package
2513 Set_Is_Immediately_Visible (Id, False);
2515 -- If this is a private type with a full view (for example a local
2516 -- subtype of a private type declared elsewhere), ensure that the
2517 -- full view is also removed from visibility: it may be exposed when
2518 -- swapping views in an instantiation.
2520 if Is_Type (Id) and then Present (Full_View (Id)) then
2521 Set_Is_Immediately_Visible (Full_View (Id), False);
2524 if Is_Tagged_Type (Id) and then Ekind (Id) = E_Record_Type then
2525 Check_Abstract_Overriding (Id);
2526 Check_Conventions (Id);
2529 if Ekind_In (Id, E_Private_Type, E_Limited_Private_Type)
2530 and then No (Full_View (Id))
2531 and then not Is_Generic_Type (Id)
2532 and then not Is_Derived_Type (Id)
2534 Error_Msg_N ("missing full declaration for private type&", Id);
2536 elsif Ekind (Id) = E_Record_Type_With_Private
2537 and then not Is_Generic_Type (Id)
2538 and then No (Full_View (Id))
2540 if Nkind (Parent (Id)) = N_Private_Type_Declaration then
2541 Error_Msg_N ("missing full declaration for private type&", Id);
2544 ("missing full declaration for private extension", Id);
2547 -- Case of constant, check for deferred constant declaration with
2548 -- no full view. Likely just a matter of a missing expression, or
2549 -- accidental use of the keyword constant.
2551 elsif Ekind (Id) = E_Constant
2553 -- OK if constant value present
2555 and then No (Constant_Value (Id))
2557 -- OK if full view present
2559 and then No (Full_View (Id))
2561 -- OK if imported, since that provides the completion
2563 and then not Is_Imported (Id)
2565 -- OK if object declaration replaced by renaming declaration as
2566 -- a result of OK_To_Rename processing (e.g. for concatenation)
2568 and then Nkind (Parent (Id)) /= N_Object_Renaming_Declaration
2570 -- OK if object declaration with the No_Initialization flag set
2572 and then not (Nkind (Parent (Id)) = N_Object_Declaration
2573 and then No_Initialization (Parent (Id)))
2575 -- If no private declaration is present, we assume the user did
2576 -- not intend a deferred constant declaration and the problem
2577 -- is simply that the initializing expression is missing.
2579 if not Has_Private_Declaration (Etype (Id)) then
2581 -- We assume that the user did not intend a deferred constant
2582 -- declaration, and the expression is just missing.
2585 ("constant declaration requires initialization expression",
2588 if Is_Limited_Type (Etype (Id)) then
2590 ("\if variable intended, remove CONSTANT from declaration",
2594 -- Otherwise if a private declaration is present, then we are
2595 -- missing the full declaration for the deferred constant.
2599 ("missing full declaration for deferred constant (RM 7.4)",
2602 if Is_Limited_Type (Etype (Id)) then
2604 ("\if variable intended, remove CONSTANT from declaration",
2613 -- If the specification was installed as the parent of a public child
2614 -- unit, the private declarations were not installed, and there is
2617 if not In_Private_Part (P) then
2620 Set_In_Private_Part (P, False);
2623 -- Make private entities invisible and exchange full and private
2624 -- declarations for private types. Id is now the first private entity
2627 while Present (Id) loop
2628 if Debug_Flag_E then
2629 Write_Str ("unlinking private entity ");
2630 Write_Int (Int (Id));
2634 if Is_Tagged_Type (Id) and then Ekind (Id) = E_Record_Type then
2635 Check_Abstract_Overriding (Id);
2636 Check_Conventions (Id);
2639 Set_Is_Immediately_Visible (Id, False);
2641 if Is_Private_Base_Type (Id) and then Present (Full_View (Id)) then
2642 Full := Full_View (Id);
2644 -- If the partial view is not declared in the visible part of the
2645 -- package (as is the case when it is a type derived from some
2646 -- other private type in the private part of the current package),
2647 -- no exchange takes place.
2650 or else List_Containing (Parent (Id)) /=
2651 Visible_Declarations (Specification (Decl))
2656 -- The entry in the private part points to the full declaration,
2657 -- which is currently visible. Exchange them so only the private
2658 -- type declaration remains accessible, and link private and full
2659 -- declaration in the opposite direction. Before the actual
2660 -- exchange, we copy back attributes of the full view that must
2661 -- be available to the partial view too.
2663 Preserve_Full_Attributes (Id, Full);
2665 Set_Is_Potentially_Use_Visible (Id, In_Use (P));
2667 -- The following test may be redundant, as this is already
2668 -- diagnosed in sem_ch3. ???
2670 if Is_Indefinite_Subtype (Full)
2671 and then not Is_Indefinite_Subtype (Id)
2673 Error_Msg_Sloc := Sloc (Parent (Id));
2675 ("full view of& not compatible with declaration#", Full, Id);
2678 -- Swap out the subtypes and derived types of Id that
2679 -- were compiled in this scope, or installed previously
2680 -- by Install_Private_Declarations.
2682 -- Before we do the swap, we verify the presence of the Full_View
2683 -- field which may be empty due to a swap by a previous call to
2684 -- End_Package_Scope (e.g. from the freezing mechanism).
2686 Priv_Elmt := First_Elmt (Private_Dependents (Id));
2687 while Present (Priv_Elmt) loop
2688 Priv_Sub := Node (Priv_Elmt);
2690 if Present (Full_View (Priv_Sub)) then
2691 if Scope (Priv_Sub) = P
2692 or else not In_Open_Scopes (Scope (Priv_Sub))
2694 Set_Is_Immediately_Visible (Priv_Sub, False);
2697 if Is_Visible_Dependent (Priv_Sub) then
2698 Preserve_Full_Attributes
2699 (Priv_Sub, Full_View (Priv_Sub));
2700 Replace_Elmt (Priv_Elmt, Full_View (Priv_Sub));
2701 Exchange_Declarations (Priv_Sub);
2705 Next_Elmt (Priv_Elmt);
2708 -- Now restore the type itself to its private view
2710 Exchange_Declarations (Id);
2712 -- If we have installed an underlying full view for a type derived
2713 -- from a private type in a child unit, restore the proper views
2714 -- of private and full view. See corresponding code in
2715 -- Install_Private_Declarations.
2717 -- After the exchange, Full denotes the private type in the
2718 -- visible part of the package.
2720 if Is_Private_Base_Type (Full)
2721 and then Present (Full_View (Full))
2722 and then Present (Underlying_Full_View (Full))
2723 and then In_Package_Body (Current_Scope)
2725 Set_Full_View (Full, Underlying_Full_View (Full));
2726 Set_Underlying_Full_View (Full, Empty);
2729 elsif Ekind (Id) = E_Incomplete_Type
2730 and then Comes_From_Source (Id)
2731 and then No (Full_View (Id))
2733 -- Mark Taft amendment types. Verify that there are no primitive
2734 -- operations declared for the type (3.10.1(9)).
2736 Set_Has_Completion_In_Body (Id);
2743 Elmt := First_Elmt (Private_Dependents (Id));
2744 while Present (Elmt) loop
2745 Subp := Node (Elmt);
2747 -- Is_Primitive is tested because there can be cases where
2748 -- nonprimitive subprograms (in nested packages) are added
2749 -- to the Private_Dependents list.
2751 if Is_Overloadable (Subp) and then Is_Primitive (Subp) then
2753 ("type& must be completed in the private part",
2756 -- The result type of an access-to-function type cannot be a
2757 -- Taft-amendment type, unless the version is Ada 2012 or
2758 -- later (see AI05-151).
2760 elsif Ada_Version < Ada_2012
2761 and then Ekind (Subp) = E_Subprogram_Type
2763 if Etype (Subp) = Id
2765 (Is_Class_Wide_Type (Etype (Subp))
2766 and then Etype (Etype (Subp)) = Id)
2769 ("type& must be completed in the private part",
2770 Associated_Node_For_Itype (Subp), Id);
2778 elsif not Is_Child_Unit (Id)
2779 and then (not Is_Private_Type (Id) or else No (Full_View (Id)))
2782 Set_Is_Potentially_Use_Visible (Id, False);
2788 end Uninstall_Declarations;
2790 ------------------------
2791 -- Unit_Requires_Body --
2792 ------------------------
2794 function Unit_Requires_Body
2796 Ignore_Abstract_State : Boolean := False) return Boolean
2801 -- Imported entity never requires body. Right now, only subprograms can
2802 -- be imported, but perhaps in the future we will allow import of
2805 if Is_Imported (P) then
2808 -- Body required if library package with pragma Elaborate_Body
2810 elsif Has_Pragma_Elaborate_Body (P) then
2813 -- Body required if subprogram
2815 elsif Is_Subprogram_Or_Generic_Subprogram (P) then
2818 -- Treat a block as requiring a body
2820 elsif Ekind (P) = E_Block then
2823 elsif Ekind (P) = E_Package
2824 and then Nkind (Parent (P)) = N_Package_Specification
2825 and then Present (Generic_Parent (Parent (P)))
2828 G_P : constant Entity_Id := Generic_Parent (Parent (P));
2830 if Has_Pragma_Elaborate_Body (G_P) then
2835 -- A [generic] package that introduces at least one non-null abstract
2836 -- state requires completion. However, there is a separate rule that
2837 -- requires that such a package have a reason other than this for a
2838 -- body being required (if necessary a pragma Elaborate_Body must be
2839 -- provided). If Ignore_Abstract_State is True, we don't do this check
2840 -- (so we can use Unit_Requires_Body to check for some other reason).
2842 elsif Ekind_In (P, E_Generic_Package, E_Package)
2843 and then not Ignore_Abstract_State
2844 and then Present (Abstract_States (P))
2845 and then not Is_Null_State (Node (First_Elmt (Abstract_States (P))))
2850 -- Otherwise search entity chain for entity requiring completion
2852 E := First_Entity (P);
2853 while Present (E) loop
2855 -- Always ignore child units. Child units get added to the entity
2856 -- list of a parent unit, but are not original entities of the
2857 -- parent, and so do not affect whether the parent needs a body.
2859 if Is_Child_Unit (E) then
2862 -- Ignore formal packages and their renamings
2864 elsif Ekind (E) = E_Package
2865 and then Nkind (Original_Node (Unit_Declaration_Node (E))) =
2866 N_Formal_Package_Declaration
2870 -- Otherwise test to see if entity requires a completion.
2871 -- Note that subprogram entities whose declaration does not come
2872 -- from source are ignored here on the basis that we assume the
2873 -- expander will provide an implicit completion at some point.
2875 elsif (Is_Overloadable (E)
2876 and then Ekind (E) /= E_Enumeration_Literal
2877 and then Ekind (E) /= E_Operator
2878 and then not Is_Abstract_Subprogram (E)
2879 and then not Has_Completion (E)
2880 and then Comes_From_Source (Parent (E)))
2883 (Ekind (E) = E_Package
2885 and then not Has_Completion (E)
2886 and then Unit_Requires_Body (E))
2889 (Ekind (E) = E_Incomplete_Type
2890 and then No (Full_View (E))
2891 and then not Is_Generic_Type (E))
2894 (Ekind_In (E, E_Task_Type, E_Protected_Type)
2895 and then not Has_Completion (E))
2898 (Ekind (E) = E_Generic_Package
2900 and then not Has_Completion (E)
2901 and then Unit_Requires_Body (E))
2904 (Is_Generic_Subprogram (E)
2905 and then not Has_Completion (E))
2910 -- Entity that does not require completion
2920 end Unit_Requires_Body;
2922 -----------------------------
2923 -- Unit_Requires_Body_Info --
2924 -----------------------------
2926 procedure Unit_Requires_Body_Info (P : Entity_Id) is
2930 -- Imported entity never requires body. Right now, only subprograms can
2931 -- be imported, but perhaps in the future we will allow import of
2934 if Is_Imported (P) then
2937 -- Body required if library package with pragma Elaborate_Body
2939 elsif Has_Pragma_Elaborate_Body (P) then
2940 Error_Msg_N ("info: & requires body (Elaborate_Body)?Y?", P);
2942 -- Body required if subprogram
2944 elsif Is_Subprogram_Or_Generic_Subprogram (P) then
2945 Error_Msg_N ("info: & requires body (subprogram case)?Y?", P);
2947 -- Body required if generic parent has Elaborate_Body
2949 elsif Ekind (P) = E_Package
2950 and then Nkind (Parent (P)) = N_Package_Specification
2951 and then Present (Generic_Parent (Parent (P)))
2954 G_P : constant Entity_Id := Generic_Parent (Parent (P));
2956 if Has_Pragma_Elaborate_Body (G_P) then
2958 ("info: & requires body (generic parent Elaborate_Body)?Y?",
2963 -- A [generic] package that introduces at least one non-null abstract
2964 -- state requires completion. However, there is a separate rule that
2965 -- requires that such a package have a reason other than this for a
2966 -- body being required (if necessary a pragma Elaborate_Body must be
2967 -- provided). If Ignore_Abstract_State is True, we don't do this check
2968 -- (so we can use Unit_Requires_Body to check for some other reason).
2970 elsif Ekind_In (P, E_Generic_Package, E_Package)
2971 and then Present (Abstract_States (P))
2972 and then not Is_Null_State (Node (First_Elmt (Abstract_States (P))))
2975 ("info: & requires body (non-null abstract state aspect)?Y?", P);
2978 -- Otherwise search entity chain for entity requiring completion
2980 E := First_Entity (P);
2981 while Present (E) loop
2983 -- Always ignore child units. Child units get added to the entity
2984 -- list of a parent unit, but are not original entities of the
2985 -- parent, and so do not affect whether the parent needs a body.
2987 if Is_Child_Unit (E) then
2990 -- Ignore formal packages and their renamings
2992 elsif Ekind (E) = E_Package
2993 and then Nkind (Original_Node (Unit_Declaration_Node (E))) =
2994 N_Formal_Package_Declaration
2998 -- Otherwise test to see if entity requires a completion.
2999 -- Note that subprogram entities whose declaration does not come
3000 -- from source are ignored here on the basis that we assume the
3001 -- expander will provide an implicit completion at some point.
3003 elsif (Is_Overloadable (E)
3004 and then Ekind (E) /= E_Enumeration_Literal
3005 and then Ekind (E) /= E_Operator
3006 and then not Is_Abstract_Subprogram (E)
3007 and then not Has_Completion (E)
3008 and then Comes_From_Source (Parent (E)))
3011 (Ekind (E) = E_Package
3013 and then not Has_Completion (E)
3014 and then Unit_Requires_Body (E))
3017 (Ekind (E) = E_Incomplete_Type
3018 and then No (Full_View (E))
3019 and then not Is_Generic_Type (E))
3022 (Ekind_In (E, E_Task_Type, E_Protected_Type)
3023 and then not Has_Completion (E))
3026 (Ekind (E) = E_Generic_Package
3028 and then not Has_Completion (E)
3029 and then Unit_Requires_Body (E))
3032 (Is_Generic_Subprogram (E)
3033 and then not Has_Completion (E))
3035 Error_Msg_Node_2 := E;
3037 ("info: & requires body (& requires completion)?Y?", E, P);
3039 -- Entity that does not require completion
3047 end Unit_Requires_Body_Info;