1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2007, 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree; use Atree;
28 with Debug; use Debug;
29 with Einfo; use Einfo;
30 with Errout; use Errout;
31 with Exp_Util; use Exp_Util;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
35 with Impunit; use Impunit;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Namet; use Namet;
41 with Nlists; use Nlists;
42 with Nmake; use Nmake;
44 with Output; use Output;
45 with Restrict; use Restrict;
46 with Rident; use Rident;
47 with Rtsfind; use Rtsfind;
49 with Sem_Ch3; use Sem_Ch3;
50 with Sem_Ch6; use Sem_Ch6;
51 with Sem_Ch7; use Sem_Ch7;
52 with Sem_Ch8; use Sem_Ch8;
53 with Sem_Dist; use Sem_Dist;
54 with Sem_Prag; use Sem_Prag;
55 with Sem_Util; use Sem_Util;
56 with Sem_Warn; use Sem_Warn;
57 with Stand; use Stand;
58 with Sinfo; use Sinfo;
59 with Sinfo.CN; use Sinfo.CN;
60 with Sinput; use Sinput;
61 with Snames; use Snames;
62 with Style; use Style;
63 with Stylesw; use Stylesw;
64 with Tbuild; use Tbuild;
65 with Uname; use Uname;
67 package body Sem_Ch10 is
69 -----------------------
70 -- Local Subprograms --
71 -----------------------
73 procedure Analyze_Context (N : Node_Id);
74 -- Analyzes items in the context clause of compilation unit
76 procedure Build_Limited_Views (N : Node_Id);
77 -- Build and decorate the list of shadow entities for a package mentioned
78 -- in a limited_with clause. If the package was not previously analyzed
79 -- then it also performs a basic decoration of the real entities; this
80 -- is required to do not pass non-decorated entities to the back-end.
81 -- Implements Ada 2005 (AI-50217).
83 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id);
84 -- Check whether the source for the body of a compilation unit must
85 -- be included in a standalone library.
87 procedure Check_Private_Child_Unit (N : Node_Id);
88 -- If a with_clause mentions a private child unit, the compilation
89 -- unit must be a member of the same family, as described in 10.1.2 (8).
91 procedure Check_Stub_Level (N : Node_Id);
92 -- Verify that a stub is declared immediately within a compilation unit,
93 -- and not in an inner frame.
95 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id);
96 -- When a child unit appears in a context clause, the implicit withs on
97 -- parents are made explicit, and with clauses are inserted in the context
98 -- clause before the one for the child. If a parent in the with_clause
99 -- is a renaming, the implicit with_clause is on the renaming whose name
100 -- is mentioned in the with_clause, and not on the package it renames.
101 -- N is the compilation unit whose list of context items receives the
102 -- implicit with_clauses.
104 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
105 -- Get defining entity of parent unit of a child unit. In most cases this
106 -- is the defining entity of the unit, but for a child instance whose
107 -- parent needs a body for inlining, the instantiation node of the parent
108 -- has not yet been rewritten as a package declaration, and the entity has
109 -- to be retrieved from the Instance_Spec of the unit.
111 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id);
112 -- If the main unit is a child unit, implicit withs are also added for
113 -- all its ancestors.
115 function In_Chain (E : Entity_Id) return Boolean;
116 -- Check that the shadow entity is not already in the homonym chain, for
117 -- example through a limited_with clause in a parent unit.
119 procedure Install_Context_Clauses (N : Node_Id);
120 -- Subsidiary to Install_Context and Install_Parents. Process only with_
121 -- and use_clauses for current unit and its library unit if any.
123 procedure Install_Limited_Context_Clauses (N : Node_Id);
124 -- Subsidiary to Install_Context. Process only limited with_clauses
125 -- for current unit. Implements Ada 2005 (AI-50217).
127 procedure Install_Limited_Withed_Unit (N : Node_Id);
128 -- Place shadow entities for a limited_with package in the visibility
129 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
131 procedure Install_Withed_Unit
132 (With_Clause : Node_Id;
133 Private_With_OK : Boolean := False);
134 -- If the unit is not a child unit, make unit immediately visible.
135 -- The caller ensures that the unit is not already currently installed.
136 -- The flag Private_With_OK is set true in Install_Private_With_Clauses,
137 -- which is called when compiling the private part of a package, or
138 -- installing the private declarations of a parent unit.
140 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean);
141 -- This procedure establishes the context for the compilation of a child
142 -- unit. If Lib_Unit is a child library spec then the context of the parent
143 -- is installed, and the parent itself made immediately visible, so that
144 -- the child unit is processed in the declarative region of the parent.
145 -- Install_Parents makes a recursive call to itself to ensure that all
146 -- parents are loaded in the nested case. If Lib_Unit is a library body,
147 -- the only effect of Install_Parents is to install the private decls of
148 -- the parents, because the visible parent declarations will have been
149 -- installed as part of the context of the corresponding spec.
151 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id);
152 -- In the compilation of a child unit, a child of any of the ancestor
153 -- units is directly visible if it is visible, because the parent is in
154 -- an enclosing scope. Iterate over context to find child units of U_Name
155 -- or of some ancestor of it.
157 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean;
158 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
159 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
160 -- a library spec that has a parent. If the call to Is_Child_Spec returns
161 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
162 -- compilation unit for the parent spec.
164 -- Lib_Unit can also be a subprogram body that acts as its own spec. If
165 -- the Parent_Spec is non-empty, this is also a child unit.
167 procedure Remove_Context_Clauses (N : Node_Id);
168 -- Subsidiary of previous one. Remove use_ and with_clauses
170 procedure Remove_Limited_With_Clause (N : Node_Id);
171 -- Remove from visibility the shadow entities introduced for a package
172 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
174 procedure Remove_Parents (Lib_Unit : Node_Id);
175 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
176 -- contexts established by the corresponding call to Install_Parents are
177 -- removed. Remove_Parents contains a recursive call to itself to ensure
178 -- that all parents are removed in the nested case.
180 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
181 -- Reset all visibility flags on unit after compiling it, either as a
182 -- main unit or as a unit in the context.
184 procedure Unchain (E : Entity_Id);
185 -- Remove single entity from visibility list
187 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
188 -- Common processing for all stubs (subprograms, tasks, packages, and
189 -- protected cases). N is the stub to be analyzed. Once the subunit
190 -- name is established, load and analyze. Nam is the non-overloadable
191 -- entity for which the proper body provides a completion. Subprogram
192 -- stubs are handled differently because they can be declarations.
195 -- A dummy procedure, for debugging use, called just before analyzing the
196 -- main unit (after dealing with any context clauses).
198 --------------------------
199 -- Limited_With_Clauses --
200 --------------------------
202 -- Limited_With clauses are the mechanism chosen for Ada05 to support
203 -- mutually recursive types declared in different units. A limited_with
204 -- clause that names package P in the context of unit U makes the types
205 -- declared in the visible part of P available within U, but with the
206 -- restriction that these types can only be used as incomplete types.
207 -- The limited_with clause does not impose a semantic dependence on P,
208 -- and it is possible for two packages to have limited_with_clauses on
209 -- each other without creating an elaboration circularity.
211 -- To support this feature, the analysis of a limited_with clause must
212 -- create an abbreviated view of the package, without performing any
213 -- semantic analysis on it. This "package abstract" contains shadow
214 -- types that are in one-one correspondence with the real types in the
215 -- package, and that have the properties of incomplete types.
217 -- The implementation creates two element lists: one to chain the shadow
218 -- entities, and one to chain the corresponding type entities in the tree
219 -- of the package. Links between corresponding entities in both chains
220 -- allow the compiler to select the proper view of a given type, depending
221 -- on the context. Note that in contrast with the handling of private
222 -- types, the limited view and the non-limited view of a type are treated
223 -- as separate entities, and no entity exchange needs to take place, which
224 -- makes the implementation must simpler than could be feared.
226 ------------------------------
227 -- Analyze_Compilation_Unit --
228 ------------------------------
230 procedure Analyze_Compilation_Unit (N : Node_Id) is
231 Unit_Node : constant Node_Id := Unit (N);
232 Lib_Unit : Node_Id := Library_Unit (N);
234 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
235 Par_Spec_Name : Unit_Name_Type;
236 Unum : Unit_Number_Type;
238 procedure Check_Redundant_Withs
239 (Context_Items : List_Id;
240 Spec_Context_Items : List_Id := No_List);
241 -- Determine whether the context list of a compilation unit contains
242 -- redundant with clauses. When checking body clauses against spec
243 -- clauses, set Context_Items to the context list of the body and
244 -- Spec_Context_Items to that of the spec. Parent packages are not
245 -- examined for documentation purposes.
247 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
248 -- Generate cross-reference information for the parents of child units.
249 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
251 ---------------------------
252 -- Check_Redundant_Withs --
253 ---------------------------
255 procedure Check_Redundant_Withs
256 (Context_Items : List_Id;
257 Spec_Context_Items : List_Id := No_List)
261 procedure Process_Body_Clauses
262 (Context_List : List_Id;
264 Used : in out Boolean;
265 Used_Type_Or_Elab : in out Boolean);
266 -- Examine the context clauses of a package body, trying to match
267 -- the name entity of Clause with any list element. If the match
268 -- occurs on a use package clause, set Used to True, for a use
269 -- type clause, pragma Elaborate or pragma Elaborate_All, set
270 -- Used_Type_Or_Elab to True.
272 procedure Process_Spec_Clauses
273 (Context_List : List_Id;
275 Used : in out Boolean;
276 Withed : in out Boolean;
277 Exit_On_Self : Boolean := False);
278 -- Examine the context clauses of a package spec, trying to match
279 -- the name entity of Clause with any list element. If the match
280 -- occurs on a use package clause, set Used to True, for a with
281 -- package clause other than Clause, set Withed to True. Limited
282 -- with clauses, implicitly generated with clauses and withs
283 -- having pragmas Elaborate or Elaborate_All applied to them are
284 -- skipped. Exit_On_Self is used to control the search loop and
285 -- force an exit whenever Clause sees itself in the search.
287 --------------------------
288 -- Process_Body_Clauses --
289 --------------------------
291 procedure Process_Body_Clauses
292 (Context_List : List_Id;
294 Used : in out Boolean;
295 Used_Type_Or_Elab : in out Boolean)
297 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
303 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean;
304 -- In an expanded name in a use clause, if the prefix is a
305 -- renamed package, the entity is set to the original package
306 -- as a result, when checking whether the package appears in a
307 -- previous with_clause, the renaming has to be taken into
308 -- account, to prevent spurious or incorrect warnings. The
309 -- common case is the use of Text_IO.
315 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean is
317 return Entity (N) = P
319 (Present (Renamed_Object (P))
320 and then Entity (N) = Renamed_Object (P));
323 -- Start of processing for Process_Body_Clauses
327 Used_Type_Or_Elab := False;
329 Cont_Item := First (Context_List);
330 while Present (Cont_Item) loop
332 -- Package use clause
334 if Nkind (Cont_Item) = N_Use_Package_Clause
337 -- Search through use clauses
339 Use_Item := First (Names (Cont_Item));
340 while Present (Use_Item) and then not Used loop
342 -- Case of a direct use of the one we are looking for
344 if Entity (Use_Item) = Nam_Ent then
347 -- Handle nested case, as in "with P; use P.Q.R"
354 -- Loop through prefixes looking for match
357 while Nkind (UE) = N_Expanded_Name loop
358 if Same_Unit (Prefix (UE), Nam_Ent) then
373 elsif Nkind (Cont_Item) = N_Use_Type_Clause
374 and then not Used_Type_Or_Elab
376 Subt_Mark := First (Subtype_Marks (Cont_Item));
377 while Present (Subt_Mark)
378 and then not Used_Type_Or_Elab
380 if Same_Unit (Prefix (Subt_Mark), Nam_Ent) then
381 Used_Type_Or_Elab := True;
387 -- Pragma Elaborate or Elaborate_All
389 elsif Nkind (Cont_Item) = N_Pragma
391 (Chars (Cont_Item) = Name_Elaborate
393 Chars (Cont_Item) = Name_Elaborate_All)
394 and then not Used_Type_Or_Elab
397 First (Pragma_Argument_Associations (Cont_Item));
398 while Present (Prag_Unit)
399 and then not Used_Type_Or_Elab
401 if Entity (Expression (Prag_Unit)) = Nam_Ent then
402 Used_Type_Or_Elab := True;
411 end Process_Body_Clauses;
413 --------------------------
414 -- Process_Spec_Clauses --
415 --------------------------
417 procedure Process_Spec_Clauses
418 (Context_List : List_Id;
420 Used : in out Boolean;
421 Withed : in out Boolean;
422 Exit_On_Self : Boolean := False)
424 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
432 Cont_Item := First (Context_List);
433 while Present (Cont_Item) loop
435 -- Stop the search since the context items after Cont_Item
436 -- have already been examined in a previous iteration of
437 -- the reverse loop in Check_Redundant_Withs.
440 and Cont_Item = Clause
445 -- Package use clause
447 if Nkind (Cont_Item) = N_Use_Package_Clause
450 Use_Item := First (Names (Cont_Item));
451 while Present (Use_Item) and then not Used loop
452 if Entity (Use_Item) = Nam_Ent then
459 -- Package with clause. Avoid processing self, implicitly
460 -- generated with clauses or limited with clauses. Note
461 -- that we examine with clauses having pragmas Elaborate
462 -- or Elaborate_All applied to them due to cases such as:
466 -- pragma Elaborate (Pack);
468 -- In this case, the second with clause is redundant since
469 -- the pragma applies only to the first "with Pack;".
471 elsif Nkind (Cont_Item) = N_With_Clause
472 and then not Implicit_With (Cont_Item)
473 and then not Limited_Present (Cont_Item)
474 and then Cont_Item /= Clause
475 and then Entity (Name (Cont_Item)) = Nam_Ent
482 end Process_Spec_Clauses;
484 -- Start of processing for Check_Redundant_Withs
487 Clause := Last (Context_Items);
488 while Present (Clause) loop
490 -- Avoid checking implicitly generated with clauses, limited
491 -- with clauses or withs that have pragma Elaborate or
492 -- Elaborate_All apllied.
494 if Nkind (Clause) = N_With_Clause
495 and then not Implicit_With (Clause)
496 and then not Limited_Present (Clause)
497 and then not Elaborate_Present (Clause)
499 -- Package body-to-spec check
501 if Present (Spec_Context_Items) then
503 Used_In_Body : Boolean := False;
504 Used_In_Spec : Boolean := False;
505 Used_Type_Or_Elab : Boolean := False;
506 Withed_In_Spec : Boolean := False;
510 (Context_List => Spec_Context_Items,
512 Used => Used_In_Spec,
513 Withed => Withed_In_Spec);
516 (Context_List => Context_Items,
518 Used => Used_In_Body,
519 Used_Type_Or_Elab => Used_Type_Or_Elab);
521 -- "Type Elab" refers to the presence of either a use
522 -- type clause, pragmas Elaborate or Elaborate_All.
524 -- +---------------+---------------------------+------+
525 -- | Spec | Body | Warn |
526 -- +--------+------+--------+------+-----------+------+
527 -- | Withed | Used | Withed | Used | Type Elab | |
528 -- | X | | X | | | X |
529 -- | X | | X | X | | |
530 -- | X | | X | | X | |
531 -- | X | | X | X | X | |
532 -- | X | X | X | | | X |
533 -- | X | X | X | | X | |
534 -- | X | X | X | X | | X |
535 -- | X | X | X | X | X | |
536 -- +--------+------+--------+------+-----------+------+
539 and then not Used_Type_Or_Elab)
542 and then not Used_In_Body)
546 Error_Msg_N ("?redundant with clause in body", Clause);
549 Used_In_Body := False;
550 Used_In_Spec := False;
551 Used_Type_Or_Elab := False;
552 Withed_In_Spec := False;
555 -- Standalone package spec or body check
559 Dont_Care : Boolean := False;
560 Withed : Boolean := False;
563 -- The mechanism for examining the context clauses of a
564 -- package spec can be applied to package body clauses.
567 (Context_List => Context_Items,
571 Exit_On_Self => True);
574 Error_Msg_N ("?redundant with clause", Clause);
582 end Check_Redundant_Withs;
584 --------------------------------
585 -- Generate_Parent_References --
586 --------------------------------
588 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is
590 P_Name : Entity_Id := P_Id;
593 Pref := Name (Parent (Defining_Entity (N)));
595 if Nkind (Pref) = N_Expanded_Name then
597 -- Done already, if the unit has been compiled indirectly as
598 -- part of the closure of its context because of inlining.
603 while Nkind (Pref) = N_Selected_Component loop
604 Change_Selected_Component_To_Expanded_Name (Pref);
605 Set_Entity (Pref, P_Name);
606 Set_Etype (Pref, Etype (P_Name));
607 Generate_Reference (P_Name, Pref, 'r');
608 Pref := Prefix (Pref);
609 P_Name := Scope (P_Name);
612 -- The guard here on P_Name is to handle the error condition where
613 -- the parent unit is missing because the file was not found.
615 if Present (P_Name) then
616 Set_Entity (Pref, P_Name);
617 Set_Etype (Pref, Etype (P_Name));
618 Generate_Reference (P_Name, Pref, 'r');
619 Style.Check_Identifier (Pref, P_Name);
621 end Generate_Parent_References;
623 -- Start of processing for Analyze_Compilation_Unit
626 Process_Compilation_Unit_Pragmas (N);
628 -- If the unit is a subunit whose parent has not been analyzed (which
629 -- indicates that the main unit is a subunit, either the current one or
630 -- one of its descendents) then the subunit is compiled as part of the
631 -- analysis of the parent, which we proceed to do. Basically this gets
632 -- handled from the top down and we don't want to do anything at this
633 -- level (i.e. this subunit will be handled on the way down from the
634 -- parent), so at this level we immediately return. If the subunit
635 -- ends up not analyzed, it means that the parent did not contain a
636 -- stub for it, or that there errors were dectected in some ancestor.
638 if Nkind (Unit_Node) = N_Subunit
639 and then not Analyzed (Lib_Unit)
641 Semantics (Lib_Unit);
643 if not Analyzed (Proper_Body (Unit_Node)) then
644 if Serious_Errors_Detected > 0 then
645 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N);
647 Error_Msg_N ("missing stub for subunit", N);
654 -- Analyze context (this will call Sem recursively for with'ed units)
658 -- If the unit is a package body, the spec is already loaded and must
659 -- be analyzed first, before we analyze the body.
661 if Nkind (Unit_Node) = N_Package_Body then
663 -- If no Lib_Unit, then there was a serious previous error, so
664 -- just ignore the entire analysis effort
666 if No (Lib_Unit) then
670 Semantics (Lib_Unit);
671 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
673 -- Verify that the library unit is a package declaration
675 if Nkind (Unit (Lib_Unit)) /= N_Package_Declaration
677 Nkind (Unit (Lib_Unit)) /= N_Generic_Package_Declaration
680 ("no legal package declaration for package body", N);
683 -- Otherwise, the entity in the declaration is visible. Update
684 -- the version to reflect dependence of this body on the spec.
687 Spec_Id := Defining_Entity (Unit (Lib_Unit));
688 Set_Is_Immediately_Visible (Spec_Id, True);
689 Version_Update (N, Lib_Unit);
691 if Nkind (Defining_Unit_Name (Unit_Node))
692 = N_Defining_Program_Unit_Name
694 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
699 -- If the unit is a subprogram body, then we similarly need to analyze
700 -- its spec. However, things are a little simpler in this case, because
701 -- here, this analysis is done only for error checking and consistency
702 -- purposes, so there's nothing else to be done.
704 elsif Nkind (Unit_Node) = N_Subprogram_Body then
705 if Acts_As_Spec (N) then
707 -- If the subprogram body is a child unit, we must create a
708 -- declaration for it, in order to properly load the parent(s).
709 -- After this, the original unit does not acts as a spec, because
710 -- there is an explicit one. If this unit appears in a context
711 -- clause, then an implicit with on the parent will be added when
712 -- installing the context. If this is the main unit, there is no
713 -- Unit_Table entry for the declaration, (It has the unit number
714 -- of the main unit) and code generation is unaffected.
716 Unum := Get_Cunit_Unit_Number (N);
717 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
719 if Par_Spec_Name /= No_Unit_Name then
722 (Load_Name => Par_Spec_Name,
727 if Unum /= No_Unit then
729 -- Build subprogram declaration and attach parent unit to it
730 -- This subprogram declaration does not come from source,
731 -- Nevertheless the backend must generate debugging info for
732 -- it, and this must be indicated explicitly.
735 Loc : constant Source_Ptr := Sloc (N);
736 SCS : constant Boolean :=
737 Get_Comes_From_Source_Default;
740 Set_Comes_From_Source_Default (False);
742 Make_Compilation_Unit (Loc,
743 Context_Items => New_Copy_List (Context_Items (N)),
745 Make_Subprogram_Declaration (Sloc (N),
748 (Specification (Unit_Node))),
750 Make_Compilation_Unit_Aux (Loc));
752 Set_Library_Unit (N, Lib_Unit);
753 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
754 Semantics (Lib_Unit);
755 Set_Acts_As_Spec (N, False);
756 Set_Needs_Debug_Info (Defining_Entity (Unit (Lib_Unit)));
757 Set_Comes_From_Source_Default (SCS);
762 -- Here for subprogram with separate declaration
765 Semantics (Lib_Unit);
766 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
767 Version_Update (N, Lib_Unit);
770 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
771 N_Defining_Program_Unit_Name
773 Generate_Parent_References (
774 Specification (Unit_Node),
775 Scope (Defining_Entity (Unit (Lib_Unit))));
779 -- If it is a child unit, the parent must be elaborated first
780 -- and we update version, since we are dependent on our parent.
782 if Is_Child_Spec (Unit_Node) then
784 -- The analysis of the parent is done with style checks off
787 Save_Style_Check : constant Boolean := Style_Check;
788 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
789 Cunit_Boolean_Restrictions_Save;
792 if not GNAT_Mode then
793 Style_Check := False;
796 Semantics (Parent_Spec (Unit_Node));
797 Version_Update (N, Parent_Spec (Unit_Node));
798 Style_Check := Save_Style_Check;
799 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
803 -- With the analysis done, install the context. Note that we can't
804 -- install the context from the with clauses as we analyze them,
805 -- because each with clause must be analyzed in a clean visibility
806 -- context, so we have to wait and install them all at once.
810 if Is_Child_Spec (Unit_Node) then
812 -- Set the entities of all parents in the program_unit_name
814 Generate_Parent_References (
815 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
818 -- All components of the context: with-clauses, library unit, ancestors
819 -- if any, (and their context) are analyzed and installed.
821 -- Call special debug routine sm if this is the main unit
823 if Current_Sem_Unit = Main_Unit then
827 -- Now analyze the unit (package, subprogram spec, body) itself
831 if Warn_On_Redundant_Constructs then
832 Check_Redundant_Withs (Context_Items (N));
834 if Nkind (Unit_Node) = N_Package_Body then
835 Check_Redundant_Withs
836 (Context_Items => Context_Items (N),
837 Spec_Context_Items => Context_Items (Lib_Unit));
841 -- The above call might have made Unit_Node an N_Subprogram_Body
842 -- from something else, so propagate any Acts_As_Spec flag.
844 if Nkind (Unit_Node) = N_Subprogram_Body
845 and then Acts_As_Spec (Unit_Node)
847 Set_Acts_As_Spec (N);
850 -- Register predefined units in Rtsfind
853 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
855 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
856 Set_RTU_Loaded (Unit_Node);
860 -- Treat compilation unit pragmas that appear after the library unit
862 if Present (Pragmas_After (Aux_Decls_Node (N))) then
864 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
866 while Present (Prag_Node) loop
873 -- Generate distribution stubs if requested and no error
876 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
878 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
879 and then not Fatal_Error (Main_Unit)
881 if Is_RCI_Pkg_Spec_Or_Body (N) then
883 -- Regular RCI package
885 Add_Stub_Constructs (N);
887 elsif (Nkind (Unit_Node) = N_Package_Declaration
888 and then Is_Shared_Passive (Defining_Entity
889 (Specification (Unit_Node))))
890 or else (Nkind (Unit_Node) = N_Package_Body
892 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
894 -- Shared passive package
896 Add_Stub_Constructs (N);
898 elsif Nkind (Unit_Node) = N_Package_Instantiation
900 Is_Remote_Call_Interface
901 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
903 -- Instantiation of a RCI generic package
905 Add_Stub_Constructs (N);
910 if Nkind (Unit_Node) = N_Package_Declaration
911 or else Nkind (Unit_Node) in N_Generic_Declaration
912 or else Nkind (Unit_Node) = N_Package_Renaming_Declaration
913 or else Nkind (Unit_Node) = N_Subprogram_Declaration
915 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
917 -- If the unit is an instantiation whose body will be elaborated
918 -- for inlining purposes, use the the proper entity of the instance.
919 -- The entity may be missing if the instantiation was illegal.
921 elsif Nkind (Unit_Node) = N_Package_Instantiation
922 and then not Error_Posted (Unit_Node)
923 and then Present (Instance_Spec (Unit_Node))
925 Remove_Unit_From_Visibility
926 (Defining_Entity (Instance_Spec (Unit_Node)));
928 elsif Nkind (Unit_Node) = N_Package_Body
929 or else (Nkind (Unit_Node) = N_Subprogram_Body
930 and then not Acts_As_Spec (Unit_Node))
932 -- Bodies that are not the main unit are compiled if they
933 -- are generic or contain generic or inlined units. Their
934 -- analysis brings in the context of the corresponding spec
935 -- (unit declaration) which must be removed as well, to
936 -- return the compilation environment to its proper state.
938 Remove_Context (Lib_Unit);
939 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
942 -- Last step is to deinstall the context we just installed
943 -- as well as the unit just compiled.
947 -- If this is the main unit and we are generating code, we must
948 -- check that all generic units in the context have a body if they
949 -- need it, even if they have not been instantiated. In the absence
950 -- of .ali files for generic units, we must force the load of the body,
951 -- just to produce the proper error if the body is absent. We skip this
952 -- verification if the main unit itself is generic.
954 if Get_Cunit_Unit_Number (N) = Main_Unit
955 and then Operating_Mode = Generate_Code
956 and then Expander_Active
958 -- Check whether the source for the body of the unit must be
959 -- included in a standalone library.
961 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
963 -- Indicate that the main unit is now analyzed, to catch possible
964 -- circularities between it and generic bodies. Remove main unit
965 -- from visibility. This might seem superfluous, but the main unit
966 -- must not be visible in the generic body expansions that follow.
968 Set_Analyzed (N, True);
969 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
974 Un : Unit_Number_Type;
976 Save_Style_Check : constant Boolean := Style_Check;
977 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
978 Cunit_Boolean_Restrictions_Save;
981 Item := First (Context_Items (N));
982 while Present (Item) loop
984 -- Check for explicit with clause
986 if Nkind (Item) = N_With_Clause
987 and then not Implicit_With (Item)
989 -- Ada 2005 (AI-50217): Ignore limited-withed units
991 and then not Limited_Present (Item)
993 Nam := Entity (Name (Item));
995 if (Is_Generic_Subprogram (Nam)
996 and then not Is_Intrinsic_Subprogram (Nam))
997 or else (Ekind (Nam) = E_Generic_Package
998 and then Unit_Requires_Body (Nam))
1000 Style_Check := False;
1002 if Present (Renamed_Object (Nam)) then
1005 (Load_Name => Get_Body_Name
1007 (Unit_Declaration_Node
1008 (Renamed_Object (Nam)))),
1016 (Load_Name => Get_Body_Name
1017 (Get_Unit_Name (Item)),
1024 if Un = No_Unit then
1026 ("body of generic unit& not found", Item, Nam);
1029 elsif not Analyzed (Cunit (Un))
1030 and then Un /= Main_Unit
1031 and then not Fatal_Error (Un)
1033 Style_Check := False;
1034 Semantics (Cunit (Un));
1042 Style_Check := Save_Style_Check;
1043 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1047 -- Deal with creating elaboration Boolean if needed. We create an
1048 -- elaboration boolean only for units that come from source since
1049 -- units manufactured by the compiler never need elab checks.
1051 if Comes_From_Source (N)
1053 (Nkind (Unit (N)) = N_Package_Declaration or else
1054 Nkind (Unit (N)) = N_Generic_Package_Declaration or else
1055 Nkind (Unit (N)) = N_Subprogram_Declaration or else
1056 Nkind (Unit (N)) = N_Generic_Subprogram_Declaration)
1059 Loc : constant Source_Ptr := Sloc (N);
1060 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1063 Spec_Id := Defining_Entity (Unit (N));
1064 Generate_Definition (Spec_Id);
1066 -- See if an elaboration entity is required for possible
1067 -- access before elaboration checking. Note that we must
1068 -- allow for this even if -gnatE is not set, since a client
1069 -- may be compiled in -gnatE mode and reference the entity.
1071 -- These entities are also used by the binder to prevent multiple
1072 -- attempts to execute the elaboration code for the library case
1073 -- where the elaboration routine might otherwise be called more
1076 -- Case of units which do not require elaboration checks
1079 -- Pure units do not need checks
1083 -- Preelaborated units do not need checks
1085 or else Is_Preelaborated (Spec_Id)
1087 -- No checks needed if pagma Elaborate_Body present
1089 or else Has_Pragma_Elaborate_Body (Spec_Id)
1091 -- No checks needed if unit does not require a body
1093 or else not Unit_Requires_Body (Spec_Id)
1095 -- No checks needed for predefined files
1097 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1099 -- No checks required if no separate spec
1101 or else Acts_As_Spec (N)
1103 -- This is a case where we only need the entity for
1104 -- checking to prevent multiple elaboration checks.
1106 Set_Elaboration_Entity_Required (Spec_Id, False);
1108 -- Case of elaboration entity is required for access before
1109 -- elaboration checking (so certainly we must build it!)
1112 Set_Elaboration_Entity_Required (Spec_Id, True);
1115 Build_Elaboration_Entity (N, Spec_Id);
1119 -- Freeze the compilation unit entity. This for sure is needed because
1120 -- of some warnings that can be output (see Freeze_Subprogram), but may
1121 -- in general be required. If freezing actions result, place them in the
1122 -- compilation unit actions list, and analyze them.
1125 Loc : constant Source_Ptr := Sloc (N);
1126 L : constant List_Id :=
1127 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), Loc);
1129 while Is_Non_Empty_List (L) loop
1130 Insert_Library_Level_Action (Remove_Head (L));
1136 if Nkind (Unit_Node) = N_Package_Declaration
1137 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1138 and then Expander_Active
1141 Save_Style_Check : constant Boolean := Style_Check;
1142 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1143 Options : Style_Check_Options;
1146 Save_Style_Check_Options (Options);
1147 Reset_Style_Check_Options;
1148 Opt.Warning_Mode := Suppress;
1149 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1151 Reset_Style_Check_Options;
1152 Set_Style_Check_Options (Options);
1153 Style_Check := Save_Style_Check;
1154 Warning_Mode := Save_Warning;
1158 -- If we are generating obsolescent warnings, then here is where we
1159 -- generate them for the with'ed items. The reason for this special
1160 -- processing is that the normal mechanism of generating the warnings
1161 -- for referenced entities does not work for context clause references.
1162 -- That's because when we first analyze the context, it is too early to
1163 -- know if the with'ing unit is itself obsolescent (which suppresses
1166 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1168 -- Push current compilation unit as scope, so that the test for
1169 -- being within an obsolescent unit will work correctly.
1171 Push_Scope (Defining_Entity (Unit (N)));
1173 -- Loop through context items to deal with with clauses
1181 Item := First (Context_Items (N));
1182 while Present (Item) loop
1183 if Nkind (Item) = N_With_Clause
1185 -- Suppress this check in limited-withed units. Further work
1186 -- needed here if we decide to incorporate this check on
1187 -- limited-withed units.
1189 and then not Limited_Present (Item)
1192 Ent := Entity (Nam);
1194 if Is_Obsolescent (Ent) then
1195 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1203 -- Remove temporary install of current unit as scope
1207 end Analyze_Compilation_Unit;
1209 ---------------------
1210 -- Analyze_Context --
1211 ---------------------
1213 procedure Analyze_Context (N : Node_Id) is
1214 Ukind : constant Node_Kind := Nkind (Unit (N));
1218 -- First process all configuration pragmas at the start of the context
1219 -- items. Strictly these are not part of the context clause, but that
1220 -- is where the parser puts them. In any case for sure we must analyze
1221 -- these before analyzing the actual context items, since they can have
1222 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1223 -- be with'ed as a result of changing categorizations in Ada 2005).
1225 Item := First (Context_Items (N));
1226 while Present (Item)
1227 and then Nkind (Item) = N_Pragma
1228 and then Chars (Item) in Configuration_Pragma_Names
1234 -- Loop through actual context items. This is done in two passes:
1236 -- a) The first pass analyzes non-limited with-clauses and also any
1237 -- configuration pragmas (we need to get the latter analyzed right
1238 -- away, since they can affect processing of subsequent items.
1240 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1242 while Present (Item) loop
1244 -- For with clause, analyze the with clause, and then update
1245 -- the version, since we are dependent on a unit that we with.
1247 if Nkind (Item) = N_With_Clause
1248 and then not Limited_Present (Item)
1250 -- Skip analyzing with clause if no unit, nothing to do (this
1251 -- happens for a with that references a non-existant unit)
1253 if Present (Library_Unit (Item)) then
1257 if not Implicit_With (Item) then
1258 Version_Update (N, Library_Unit (Item));
1261 -- Skip pragmas. Configuration pragmas at the start were handled in
1262 -- the loop above, and remaining pragmas are not processed until we
1263 -- actually install the context (see Install_Context). We delay the
1264 -- analysis of these pragmas to make sure that we have installed all
1265 -- the implicit with's on parent units.
1267 -- Skip use clauses at this stage, since we don't want to do any
1268 -- installing of potentially use visible entities until we we
1269 -- actually install the complete context (in Install_Context).
1270 -- Otherwise things can get installed in the wrong context.
1279 -- Second pass: examine all limited_with clauses. All other context
1280 -- items are ignored in this pass.
1282 Item := First (Context_Items (N));
1283 while Present (Item) loop
1284 if Nkind (Item) = N_With_Clause
1285 and then Limited_Present (Item)
1287 -- No need to check errors on implicitly generated limited-with
1290 if not Implicit_With (Item) then
1292 -- Check compilation unit containing the limited-with clause
1294 if Ukind /= N_Package_Declaration
1295 and then Ukind /= N_Subprogram_Declaration
1296 and then Ukind /= N_Package_Renaming_Declaration
1297 and then Ukind /= N_Subprogram_Renaming_Declaration
1298 and then Ukind not in N_Generic_Declaration
1299 and then Ukind not in N_Generic_Renaming_Declaration
1300 and then Ukind not in N_Generic_Instantiation
1302 Error_Msg_N ("limited with_clause not allowed here", Item);
1304 -- Check wrong use of a limited with clause applied to the
1305 -- compilation unit containing the limited-with clause.
1307 -- limited with P.Q;
1308 -- package P.Q is ...
1310 elsif Unit (Library_Unit (Item)) = Unit (N) then
1311 Error_Msg_N ("wrong use of limited-with clause", Item);
1313 -- Check wrong use of limited-with clause applied to some
1314 -- immediate ancestor.
1316 elsif Is_Child_Spec (Unit (N)) then
1318 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1322 P := Parent_Spec (Unit (N));
1324 if Unit (P) = Lib_U then
1325 Error_Msg_N ("limited with_clause of immediate "
1326 & "ancestor not allowed", Item);
1330 exit when not Is_Child_Spec (Unit (P));
1331 P := Parent_Spec (Unit (P));
1336 -- Check if the limited-withed unit is already visible through
1337 -- some context clause of the current compilation unit or some
1338 -- ancestor of the current compilation unit.
1341 Lim_Unit_Name : constant Node_Id := Name (Item);
1342 Comp_Unit : Node_Id;
1344 Unit_Name : Node_Id;
1349 It := First (Context_Items (Comp_Unit));
1350 while Present (It) loop
1352 and then Nkind (It) = N_With_Clause
1353 and then not Limited_Present (It)
1355 (Nkind (Unit (Library_Unit (It)))
1356 = N_Package_Declaration
1358 Nkind (Unit (Library_Unit (It)))
1359 = N_Package_Renaming_Declaration)
1361 if Nkind (Unit (Library_Unit (It)))
1362 = N_Package_Declaration
1364 Unit_Name := Name (It);
1366 Unit_Name := Name (Unit (Library_Unit (It)));
1369 -- Check if the named package (or some ancestor)
1370 -- leaves visible the full-view of the unit given
1371 -- in the limited-with clause
1374 if Designate_Same_Unit (Lim_Unit_Name,
1377 Error_Msg_Sloc := Sloc (It);
1379 ("unlimited view visible through the"
1380 & " context clause found #",
1383 ("\simultaneous visibility of the limited"
1384 & " and unlimited views not allowed"
1388 elsif Nkind (Unit_Name) = N_Identifier then
1392 Unit_Name := Prefix (Unit_Name);
1399 exit when not Is_Child_Spec (Unit (Comp_Unit));
1401 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1406 -- Skip analyzing with clause if no unit, see above
1408 if Present (Library_Unit (Item)) then
1412 -- A limited_with does not impose an elaboration order, but
1413 -- there is a semantic dependency for recompilation purposes.
1415 if not Implicit_With (Item) then
1416 Version_Update (N, Library_Unit (Item));
1419 -- Pragmas and use clauses and with clauses other than limited
1420 -- with's are ignored in this pass through the context items.
1428 end Analyze_Context;
1430 -------------------------------
1431 -- Analyze_Package_Body_Stub --
1432 -------------------------------
1434 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1435 Id : constant Entity_Id := Defining_Identifier (N);
1439 -- The package declaration must be in the current declarative part
1441 Check_Stub_Level (N);
1442 Nam := Current_Entity_In_Scope (Id);
1444 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1445 Error_Msg_N ("missing specification for package stub", N);
1447 elsif Has_Completion (Nam)
1448 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1450 Error_Msg_N ("duplicate or redundant stub for package", N);
1453 -- Indicate that the body of the package exists. If we are doing
1454 -- only semantic analysis, the stub stands for the body. If we are
1455 -- generating code, the existence of the body will be confirmed
1456 -- when we load the proper body.
1458 Set_Has_Completion (Nam);
1459 Set_Scope (Defining_Entity (N), Current_Scope);
1460 Generate_Reference (Nam, Id, 'b');
1461 Analyze_Proper_Body (N, Nam);
1463 end Analyze_Package_Body_Stub;
1465 -------------------------
1466 -- Analyze_Proper_Body --
1467 -------------------------
1469 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1470 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1471 Unum : Unit_Number_Type;
1473 procedure Optional_Subunit;
1474 -- This procedure is called when the main unit is a stub, or when we
1475 -- are not generating code. In such a case, we analyze the subunit if
1476 -- present, which is user-friendly and in fact required for ASIS, but
1477 -- we don't complain if the subunit is missing.
1479 ----------------------
1480 -- Optional_Subunit --
1481 ----------------------
1483 procedure Optional_Subunit is
1484 Comp_Unit : Node_Id;
1487 -- Try to load subunit, but ignore any errors that occur during
1488 -- the loading of the subunit, by using the special feature in
1489 -- Errout to ignore all errors. Note that Fatal_Error will still
1490 -- be set, so we will be able to check for this case below.
1492 if not ASIS_Mode then
1493 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1498 (Load_Name => Subunit_Name,
1503 if not ASIS_Mode then
1504 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1507 -- All done if we successfully loaded the subunit
1510 and then (not Fatal_Error (Unum) or else Try_Semantics)
1512 Comp_Unit := Cunit (Unum);
1514 -- If the file was empty or seriously mangled, the unit
1515 -- itself may be missing.
1517 if No (Unit (Comp_Unit)) then
1519 ("subunit does not contain expected proper body", N);
1521 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1523 ("expected SEPARATE subunit, found child unit",
1524 Cunit_Entity (Unum));
1526 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1527 Analyze_Subunit (Comp_Unit);
1528 Set_Library_Unit (N, Comp_Unit);
1531 elsif Unum = No_Unit
1532 and then Present (Nam)
1534 if Is_Protected_Type (Nam) then
1535 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1537 Set_Corresponding_Body (
1538 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1541 end Optional_Subunit;
1543 -- Start of processing for Analyze_Proper_Body
1546 -- If the subunit is already loaded, it means that the main unit
1547 -- is a subunit, and that the current unit is one of its parents
1548 -- which was being analyzed to provide the needed context for the
1549 -- analysis of the subunit. In this case we analyze the subunit and
1550 -- continue with the parent, without looking a subsequent subunits.
1552 if Is_Loaded (Subunit_Name) then
1554 -- If the proper body is already linked to the stub node,
1555 -- the stub is in a generic unit and just needs analyzing.
1557 if Present (Library_Unit (N)) then
1558 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1559 Analyze_Subunit (Library_Unit (N));
1561 -- Otherwise we must load the subunit and link to it
1564 -- Load the subunit, this must work, since we originally
1565 -- loaded the subunit earlier on. So this will not really
1566 -- load it, just give access to it.
1570 (Load_Name => Subunit_Name,
1575 -- And analyze the subunit in the parent context (note that we
1576 -- do not call Semantics, since that would remove the parent
1577 -- context). Because of this, we have to manually reset the
1578 -- compiler state to Analyzing since it got destroyed by Load.
1580 if Unum /= No_Unit then
1581 Compiler_State := Analyzing;
1583 -- Check that the proper body is a subunit and not a child
1584 -- unit. If the unit was previously loaded, the error will
1585 -- have been emitted when copying the generic node, so we
1586 -- just return to avoid cascaded errors.
1588 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1592 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1593 Analyze_Subunit (Cunit (Unum));
1594 Set_Library_Unit (N, Cunit (Unum));
1598 -- If the main unit is a subunit, then we are just performing semantic
1599 -- analysis on that subunit, and any other subunits of any parent unit
1600 -- should be ignored, except that if we are building trees for ASIS
1601 -- usage we want to annotate the stub properly.
1603 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1604 and then Subunit_Name /= Unit_Name (Main_Unit)
1610 -- But before we return, set the flag for unloaded subunits. This
1611 -- will suppress junk warnings of variables in the same declarative
1612 -- part (or a higher level one) that are in danger of looking unused
1613 -- when in fact there might be a declaration in the subunit that we
1614 -- do not intend to load.
1616 Unloaded_Subunits := True;
1619 -- If the subunit is not already loaded, and we are generating code,
1620 -- then this is the case where compilation started from the parent,
1621 -- and we are generating code for an entire subunit tree. In that
1622 -- case we definitely need to load the subunit.
1624 -- In order to continue the analysis with the rest of the parent,
1625 -- and other subunits, we load the unit without requiring its
1626 -- presence, and emit a warning if not found, rather than terminating
1627 -- the compilation abruptly, as for other missing file problems.
1629 elsif Original_Operating_Mode = Generate_Code then
1631 -- If the proper body is already linked to the stub node,
1632 -- the stub is in a generic unit and just needs analyzing.
1634 -- We update the version. Although we are not technically
1635 -- semantically dependent on the subunit, given our approach
1636 -- of macro substitution of subunits, it makes sense to
1637 -- include it in the version identification.
1639 if Present (Library_Unit (N)) then
1640 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1641 Analyze_Subunit (Library_Unit (N));
1642 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1644 -- Otherwise we must load the subunit and link to it
1649 (Load_Name => Subunit_Name,
1654 if Original_Operating_Mode = Generate_Code
1655 and then Unum = No_Unit
1657 Error_Msg_Unit_1 := Subunit_Name;
1659 Get_File_Name (Subunit_Name, Subunit => True);
1661 ("subunit$$ in file{ not found?", N);
1662 Subunits_Missing := True;
1665 -- Load_Unit may reset Compiler_State, since it may have been
1666 -- necessary to parse an additional units, so we make sure
1667 -- that we reset it to the Analyzing state.
1669 Compiler_State := Analyzing;
1671 if Unum /= No_Unit then
1672 if Debug_Flag_L then
1673 Write_Str ("*** Loaded subunit from stub. Analyze");
1678 Comp_Unit : constant Node_Id := Cunit (Unum);
1681 -- Check for child unit instead of subunit
1683 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1685 ("expected SEPARATE subunit, found child unit",
1686 Cunit_Entity (Unum));
1688 -- OK, we have a subunit
1691 -- Set corresponding stub (even if errors)
1693 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1695 -- Analyze the unit if semantics active
1697 if not Fatal_Error (Unum) or else Try_Semantics then
1698 Analyze_Subunit (Comp_Unit);
1701 -- Set the library unit pointer in any case
1703 Set_Library_Unit (N, Comp_Unit);
1705 -- We update the version. Although we are not technically
1706 -- semantically dependent on the subunit, given our
1707 -- approach of macro substitution of subunits, it makes
1708 -- sense to include it in the version identification.
1710 Version_Update (Cunit (Main_Unit), Comp_Unit);
1716 -- The remaining case is when the subunit is not already loaded and
1717 -- we are not generating code. In this case we are just performing
1718 -- semantic analysis on the parent, and we are not interested in
1719 -- the subunit. For subprograms, analyze the stub as a body. For
1720 -- other entities the stub has already been marked as completed.
1726 end Analyze_Proper_Body;
1728 ----------------------------------
1729 -- Analyze_Protected_Body_Stub --
1730 ----------------------------------
1732 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1733 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1736 Check_Stub_Level (N);
1738 -- First occurence of name may have been as an incomplete type
1740 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1741 Nam := Full_View (Nam);
1745 or else not Is_Protected_Type (Etype (Nam))
1747 Error_Msg_N ("missing specification for Protected body", N);
1749 Set_Scope (Defining_Entity (N), Current_Scope);
1750 Set_Has_Completion (Etype (Nam));
1751 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1752 Analyze_Proper_Body (N, Etype (Nam));
1754 end Analyze_Protected_Body_Stub;
1756 ----------------------------------
1757 -- Analyze_Subprogram_Body_Stub --
1758 ----------------------------------
1760 -- A subprogram body stub can appear with or without a previous
1761 -- specification. If there is one, the analysis of the body will
1762 -- find it and verify conformance. The formals appearing in the
1763 -- specification of the stub play no role, except for requiring an
1764 -- additional conformance check. If there is no previous subprogram
1765 -- declaration, the stub acts as a spec, and provides the defining
1766 -- entity for the subprogram.
1768 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1772 Check_Stub_Level (N);
1774 -- Verify that the identifier for the stub is unique within this
1775 -- declarative part.
1777 if Nkind (Parent (N)) = N_Block_Statement
1778 or else Nkind (Parent (N)) = N_Package_Body
1779 or else Nkind (Parent (N)) = N_Subprogram_Body
1781 Decl := First (Declarations (Parent (N)));
1782 while Present (Decl)
1785 if Nkind (Decl) = N_Subprogram_Body_Stub
1786 and then (Chars (Defining_Unit_Name (Specification (Decl)))
1787 = Chars (Defining_Unit_Name (Specification (N))))
1789 Error_Msg_N ("identifier for stub is not unique", N);
1796 -- Treat stub as a body, which checks conformance if there is a previous
1797 -- declaration, or else introduces entity and its signature.
1799 Analyze_Subprogram_Body (N);
1800 Analyze_Proper_Body (N, Empty);
1801 end Analyze_Subprogram_Body_Stub;
1803 ---------------------
1804 -- Analyze_Subunit --
1805 ---------------------
1807 -- A subunit is compiled either by itself (for semantic checking)
1808 -- or as part of compiling the parent (for code generation). In
1809 -- either case, by the time we actually process the subunit, the
1810 -- parent has already been installed and analyzed. The node N is
1811 -- a compilation unit, whose context needs to be treated here,
1812 -- because we come directly here from the parent without calling
1813 -- Analyze_Compilation_Unit.
1815 -- The compilation context includes the explicit context of the
1816 -- subunit, and the context of the parent, together with the parent
1817 -- itself. In order to compile the current context, we remove the
1818 -- one inherited from the parent, in order to have a clean visibility
1819 -- table. We restore the parent context before analyzing the proper
1820 -- body itself. On exit, we remove only the explicit context of the
1823 procedure Analyze_Subunit (N : Node_Id) is
1824 Lib_Unit : constant Node_Id := Library_Unit (N);
1825 Par_Unit : constant Entity_Id := Current_Scope;
1827 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1828 Num_Scopes : Int := 0;
1829 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1830 Enclosing_Child : Entity_Id := Empty;
1831 Svg : constant Suppress_Array := Scope_Suppress;
1833 procedure Analyze_Subunit_Context;
1834 -- Capture names in use clauses of the subunit. This must be done
1835 -- before re-installing parent declarations, because items in the
1836 -- context must not be hidden by declarations local to the parent.
1838 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1839 -- Recursive procedure to restore scope of all ancestors of subunit,
1840 -- from outermost in. If parent is not a subunit, the call to install
1841 -- context installs context of spec and (if parent is a child unit)
1842 -- the context of its parents as well. It is confusing that parents
1843 -- should be treated differently in both cases, but the semantics are
1844 -- just not identical.
1846 procedure Re_Install_Use_Clauses;
1847 -- As part of the removal of the parent scope, the use clauses are
1848 -- removed, to be reinstalled when the context of the subunit has
1849 -- been analyzed. Use clauses may also have been affected by the
1850 -- analysis of the context of the subunit, so they have to be applied
1851 -- again, to insure that the compilation environment of the rest of
1852 -- the parent unit is identical.
1854 procedure Remove_Scope;
1855 -- Remove current scope from scope stack, and preserve the list
1856 -- of use clauses in it, to be reinstalled after context is analyzed.
1858 -----------------------------
1859 -- Analyze_Subunit_Context --
1860 -----------------------------
1862 procedure Analyze_Subunit_Context is
1865 Unit_Name : Entity_Id;
1868 Analyze_Context (N);
1870 -- Make withed units immediately visible. If child unit, make the
1871 -- ultimate parent immediately visible.
1873 Item := First (Context_Items (N));
1874 while Present (Item) loop
1875 if Nkind (Item) = N_With_Clause then
1877 -- Protect frontend against previous errors in context clauses
1879 if Nkind (Name (Item)) /= N_Selected_Component then
1880 Unit_Name := Entity (Name (Item));
1881 while Is_Child_Unit (Unit_Name) loop
1882 Set_Is_Visible_Child_Unit (Unit_Name);
1883 Unit_Name := Scope (Unit_Name);
1886 if not Is_Immediately_Visible (Unit_Name) then
1887 Set_Is_Immediately_Visible (Unit_Name);
1888 Set_Context_Installed (Item);
1892 elsif Nkind (Item) = N_Use_Package_Clause then
1893 Nam := First (Names (Item));
1894 while Present (Nam) loop
1899 elsif Nkind (Item) = N_Use_Type_Clause then
1900 Nam := First (Subtype_Marks (Item));
1901 while Present (Nam) loop
1910 -- Reset visibility of withed units. They will be made visible
1911 -- again when we install the subunit context.
1913 Item := First (Context_Items (N));
1914 while Present (Item) loop
1915 if Nkind (Item) = N_With_Clause
1917 -- Protect frontend against previous errors in context clauses
1919 and then Nkind (Name (Item)) /= N_Selected_Component
1921 Unit_Name := Entity (Name (Item));
1922 while Is_Child_Unit (Unit_Name) loop
1923 Set_Is_Visible_Child_Unit (Unit_Name, False);
1924 Unit_Name := Scope (Unit_Name);
1927 if Context_Installed (Item) then
1928 Set_Is_Immediately_Visible (Unit_Name, False);
1929 Set_Context_Installed (Item, False);
1935 end Analyze_Subunit_Context;
1937 ------------------------
1938 -- Re_Install_Parents --
1939 ------------------------
1941 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
1945 if Nkind (Unit (L)) = N_Subunit then
1946 Re_Install_Parents (Library_Unit (L), Scope (Scop));
1949 Install_Context (L);
1951 -- If the subunit occurs within a child unit, we must restore the
1952 -- immediate visibility of any siblings that may occur in context.
1954 if Present (Enclosing_Child) then
1955 Install_Siblings (Enclosing_Child, L);
1960 if Scop /= Par_Unit then
1961 Set_Is_Immediately_Visible (Scop);
1964 -- Make entities in scope visible again. For child units, restore
1965 -- visibility only if they are actually in context.
1967 E := First_Entity (Current_Scope);
1968 while Present (E) loop
1969 if not Is_Child_Unit (E)
1970 or else Is_Visible_Child_Unit (E)
1972 Set_Is_Immediately_Visible (E);
1978 -- A subunit appears within a body, and for a nested subunits
1979 -- all the parents are bodies. Restore full visibility of their
1980 -- private entities.
1982 if Ekind (Scop) = E_Package then
1983 Set_In_Package_Body (Scop);
1984 Install_Private_Declarations (Scop);
1986 end Re_Install_Parents;
1988 ----------------------------
1989 -- Re_Install_Use_Clauses --
1990 ----------------------------
1992 procedure Re_Install_Use_Clauses is
1995 for J in reverse 1 .. Num_Scopes loop
1996 U := Use_Clauses (J);
1997 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
1998 Install_Use_Clauses (U, Force_Installation => True);
2000 end Re_Install_Use_Clauses;
2006 procedure Remove_Scope is
2010 Num_Scopes := Num_Scopes + 1;
2011 Use_Clauses (Num_Scopes) :=
2012 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2014 E := First_Entity (Current_Scope);
2015 while Present (E) loop
2016 Set_Is_Immediately_Visible (E, False);
2020 if Is_Child_Unit (Current_Scope) then
2021 Enclosing_Child := Current_Scope;
2027 -- Start of processing for Analyze_Subunit
2030 if not Is_Empty_List (Context_Items (N)) then
2032 -- Save current use clauses
2035 Remove_Context (Lib_Unit);
2037 -- Now remove parents and their context, including enclosing
2038 -- subunits and the outer parent body which is not a subunit.
2040 if Present (Lib_Spec) then
2041 Remove_Context (Lib_Spec);
2043 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2044 Lib_Spec := Library_Unit (Lib_Spec);
2046 Remove_Context (Lib_Spec);
2049 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2053 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2054 Remove_Context (Library_Unit (Lib_Spec));
2058 Set_Is_Immediately_Visible (Par_Unit, False);
2060 Analyze_Subunit_Context;
2062 Re_Install_Parents (Lib_Unit, Par_Unit);
2063 Set_Is_Immediately_Visible (Par_Unit);
2065 -- If the context includes a child unit of the parent of the
2066 -- subunit, the parent will have been removed from visibility,
2067 -- after compiling that cousin in the context. The visibility
2068 -- of the parent must be restored now. This also applies if the
2069 -- context includes another subunit of the same parent which in
2070 -- turn includes a child unit in its context.
2072 if Ekind (Par_Unit) = E_Package then
2073 if not Is_Immediately_Visible (Par_Unit)
2074 or else (Present (First_Entity (Par_Unit))
2075 and then not Is_Immediately_Visible
2076 (First_Entity (Par_Unit)))
2078 Set_Is_Immediately_Visible (Par_Unit);
2079 Install_Visible_Declarations (Par_Unit);
2080 Install_Private_Declarations (Par_Unit);
2084 Re_Install_Use_Clauses;
2085 Install_Context (N);
2087 -- Restore state of suppress flags for current body
2089 Scope_Suppress := Svg;
2091 -- If the subunit is within a child unit, then siblings of any
2092 -- parent unit that appear in the context clause of the subunit
2093 -- must also be made immediately visible.
2095 if Present (Enclosing_Child) then
2096 Install_Siblings (Enclosing_Child, N);
2101 Analyze (Proper_Body (Unit (N)));
2104 -- The subunit may contain a with_clause on a sibling of some
2105 -- ancestor. Removing the context will remove from visibility those
2106 -- ancestor child units, which must be restored to the visibility
2107 -- they have in the enclosing body.
2109 if Present (Enclosing_Child) then
2115 and then Is_Child_Unit (C)
2117 Set_Is_Immediately_Visible (C);
2118 Set_Is_Visible_Child_Unit (C);
2123 end Analyze_Subunit;
2125 ----------------------------
2126 -- Analyze_Task_Body_Stub --
2127 ----------------------------
2129 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2130 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2131 Loc : constant Source_Ptr := Sloc (N);
2134 Check_Stub_Level (N);
2136 -- First occurence of name may have been as an incomplete type
2138 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2139 Nam := Full_View (Nam);
2143 or else not Is_Task_Type (Etype (Nam))
2145 Error_Msg_N ("missing specification for task body", N);
2147 Set_Scope (Defining_Entity (N), Current_Scope);
2148 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2149 Set_Has_Completion (Etype (Nam));
2150 Analyze_Proper_Body (N, Etype (Nam));
2152 -- Set elaboration flag to indicate that entity is callable.
2153 -- This cannot be done in the expansion of the body itself,
2154 -- because the proper body is not in a declarative part. This
2155 -- is only done if expansion is active, because the context
2156 -- may be generic and the flag not defined yet.
2158 if Expander_Active then
2160 Make_Assignment_Statement (Loc,
2162 Make_Identifier (Loc,
2163 New_External_Name (Chars (Etype (Nam)), 'E')),
2164 Expression => New_Reference_To (Standard_True, Loc)));
2168 end Analyze_Task_Body_Stub;
2170 -------------------------
2171 -- Analyze_With_Clause --
2172 -------------------------
2174 -- Analyze the declaration of a unit in a with clause. At end,
2175 -- label the with clause with the defining entity for the unit.
2177 procedure Analyze_With_Clause (N : Node_Id) is
2179 -- Retrieve the original kind of the unit node, before analysis.
2180 -- If it is a subprogram instantiation, its analysis below will
2181 -- rewrite as the declaration of the wrapper package. If the same
2182 -- instantiation appears indirectly elsewhere in the context, it
2183 -- will have been analyzed already.
2185 Unit_Kind : constant Node_Kind :=
2186 Nkind (Original_Node (Unit (Library_Unit (N))));
2187 Nam : constant Node_Id := Name (N);
2189 Par_Name : Entity_Id;
2194 -- Set True if the unit currently being compiled is an internal unit
2196 Save_Style_Check : constant Boolean := Opt.Style_Check;
2197 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
2198 Cunit_Boolean_Restrictions_Save;
2201 if Limited_Present (N) then
2203 -- Ada 2005 (AI-50217): Build visibility structures but do not
2206 Build_Limited_Views (N);
2210 -- We reset ordinary style checking during the analysis of a with'ed
2211 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2212 -- definitely *does* apply to with'ed units).
2214 if not GNAT_Mode then
2215 Style_Check := False;
2218 -- If the library unit is a predefined unit, and we are in high
2219 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2220 -- for the analysis of the with'ed unit. This mode does not prevent
2221 -- explicit with'ing of run-time units.
2223 if Configurable_Run_Time_Mode
2225 Is_Predefined_File_Name
2226 (Unit_File_Name (Get_Source_Unit (Unit (Library_Unit (N)))))
2228 Configurable_Run_Time_Mode := False;
2229 Semantics (Library_Unit (N));
2230 Configurable_Run_Time_Mode := True;
2233 Semantics (Library_Unit (N));
2236 U := Unit (Library_Unit (N));
2237 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2239 -- Following checks are skipped for dummy packages (those supplied
2240 -- for with's where no matching file could be found). Such packages
2241 -- are identified by the Sloc value being set to No_Location
2243 if Sloc (U) /= No_Location then
2245 -- Check restrictions, except that we skip the check if this
2246 -- is an internal unit unless we are compiling the internal
2247 -- unit as the main unit. We also skip this for dummy packages.
2249 Check_Restriction_No_Dependence (Nam, N);
2251 if not Intunit or else Current_Sem_Unit = Main_Unit then
2252 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2255 -- Deal with special case of GNAT.Current_Exceptions which interacts
2256 -- with the optimization of local raise statements into gotos.
2258 if Nkind (Nam) = N_Selected_Component
2259 and then Nkind (Prefix (Nam)) = N_Identifier
2260 and then Chars (Prefix (Nam)) = Name_Gnat
2261 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2263 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2265 Check_Restriction (No_Exception_Propagation, N);
2266 Special_Exception_Package_Used := True;
2269 -- Check for inappropriate with of internal implementation unit
2270 -- if we are currently compiling the main unit and the main unit
2271 -- is itself not an internal unit. We do not issue this message
2272 -- for implicit with's generated by the compiler itself.
2274 if Implementation_Unit_Warnings
2275 and then Current_Sem_Unit = Main_Unit
2276 and then not Intunit
2277 and then not Implicit_With (N)
2278 and then not GNAT_Mode
2281 U_Kind : constant Kind_Of_Unit :=
2282 Get_Kind_Of_Unit (Get_Source_Unit (U));
2285 if U_Kind = Implementation_Unit then
2286 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2288 ("\use of this unit is non-portable " &
2289 "and version-dependent?",
2292 elsif U_Kind = Ada_05_Unit
2293 and then Ada_Version < Ada_05
2294 and then Warn_On_Ada_2005_Compatibility
2296 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2302 -- Semantic analysis of a generic unit is performed on a copy of
2303 -- the original tree. Retrieve the entity on which semantic info
2304 -- actually appears.
2306 if Unit_Kind in N_Generic_Declaration then
2307 E_Name := Defining_Entity (U);
2309 -- Note: in the following test, Unit_Kind is the original Nkind, but
2310 -- in the case of an instantiation, semantic analysis above will
2311 -- have replaced the unit by its instantiated version. If the instance
2312 -- body has been generated, the instance now denotes the body entity.
2313 -- For visibility purposes we need the entity of its spec.
2315 elsif (Unit_Kind = N_Package_Instantiation
2316 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2317 N_Package_Instantiation)
2318 and then Nkind (U) = N_Package_Body
2320 E_Name := Corresponding_Spec (U);
2322 elsif Unit_Kind = N_Package_Instantiation
2323 and then Nkind (U) = N_Package_Instantiation
2325 -- If the instance has not been rewritten as a package declaration,
2326 -- then it appeared already in a previous with clause. Retrieve
2327 -- the entity from the previous instance.
2329 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2331 elsif Unit_Kind in N_Subprogram_Instantiation then
2333 -- Instantiation node is replaced with a wrapper package.
2334 -- Retrieve the visible subprogram created by the instance from
2335 -- the corresponding attribute of the wrapper.
2337 E_Name := Related_Instance (Defining_Entity (U));
2339 elsif Unit_Kind = N_Package_Renaming_Declaration
2340 or else Unit_Kind in N_Generic_Renaming_Declaration
2342 E_Name := Defining_Entity (U);
2344 elsif Unit_Kind = N_Subprogram_Body
2345 and then Nkind (Name (N)) = N_Selected_Component
2346 and then not Acts_As_Spec (Library_Unit (N))
2348 -- For a child unit that has no spec, one has been created and
2349 -- analyzed. The entity required is that of the spec.
2351 E_Name := Corresponding_Spec (U);
2354 E_Name := Defining_Entity (U);
2357 if Nkind (Name (N)) = N_Selected_Component then
2359 -- Child unit in a with clause
2361 Change_Selected_Component_To_Expanded_Name (Name (N));
2364 -- Restore style checks and restrictions
2366 Style_Check := Save_Style_Check;
2367 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2369 -- Record the reference, but do NOT set the unit as referenced, we want
2370 -- to consider the unit as unreferenced if this is the only reference
2373 Set_Entity_With_Style_Check (Name (N), E_Name);
2374 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2376 if Is_Child_Unit (E_Name) then
2377 Pref := Prefix (Name (N));
2378 Par_Name := Scope (E_Name);
2379 while Nkind (Pref) = N_Selected_Component loop
2380 Change_Selected_Component_To_Expanded_Name (Pref);
2381 Set_Entity_With_Style_Check (Pref, Par_Name);
2383 Generate_Reference (Par_Name, Pref);
2384 Pref := Prefix (Pref);
2386 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2387 -- is set to Standard_Standard, and no attempt should be made to
2388 -- further unwind scopes.
2390 if Par_Name /= Standard_Standard then
2391 Par_Name := Scope (Par_Name);
2395 if Present (Entity (Pref))
2396 and then not Analyzed (Parent (Parent (Entity (Pref))))
2398 -- If the entity is set without its unit being compiled, the
2399 -- original parent is a renaming, and Par_Name is the renamed
2400 -- entity. For visibility purposes, we need the original entity,
2401 -- which must be analyzed now because Load_Unit directly retrieves
2402 -- the renamed unit, and the renaming declaration itself has not
2405 Analyze (Parent (Parent (Entity (Pref))));
2406 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2407 Par_Name := Entity (Pref);
2410 Set_Entity_With_Style_Check (Pref, Par_Name);
2411 Generate_Reference (Par_Name, Pref);
2414 -- If the withed unit is System, and a system extension pragma is
2415 -- present, compile the extension now, rather than waiting for a
2416 -- visibility check on a specific entity.
2418 if Chars (E_Name) = Name_System
2419 and then Scope (E_Name) = Standard_Standard
2420 and then Present (System_Extend_Unit)
2421 and then Present_System_Aux (N)
2423 -- If the extension is not present, an error will have been emitted
2428 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2429 -- to private_with units; they will be made visible later (just before
2430 -- the private part is analyzed)
2432 if Private_Present (N) then
2433 Set_Is_Immediately_Visible (E_Name, False);
2435 end Analyze_With_Clause;
2437 ------------------------------
2438 -- Check_Private_Child_Unit --
2439 ------------------------------
2441 procedure Check_Private_Child_Unit (N : Node_Id) is
2442 Lib_Unit : constant Node_Id := Unit (N);
2444 Curr_Unit : Entity_Id;
2445 Sub_Parent : Node_Id;
2446 Priv_Child : Entity_Id;
2447 Par_Lib : Entity_Id;
2450 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2451 -- Returns true if and only if the library unit is declared with
2452 -- an explicit designation of private.
2454 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2455 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2458 return Private_Present (Comp_Unit);
2459 end Is_Private_Library_Unit;
2461 -- Start of processing for Check_Private_Child_Unit
2464 if Nkind (Lib_Unit) = N_Package_Body
2465 or else Nkind (Lib_Unit) = N_Subprogram_Body
2467 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2468 Par_Lib := Curr_Unit;
2470 elsif Nkind (Lib_Unit) = N_Subunit then
2472 -- The parent is itself a body. The parent entity is to be found
2473 -- in the corresponding spec.
2475 Sub_Parent := Library_Unit (N);
2476 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2478 -- If the parent itself is a subunit, Curr_Unit is the entity
2479 -- of the enclosing body, retrieve the spec entity which is
2480 -- the proper ancestor we need for the following tests.
2482 if Ekind (Curr_Unit) = E_Package_Body then
2483 Curr_Unit := Spec_Entity (Curr_Unit);
2486 Par_Lib := Curr_Unit;
2489 Curr_Unit := Defining_Entity (Lib_Unit);
2491 Par_Lib := Curr_Unit;
2492 Par_Spec := Parent_Spec (Lib_Unit);
2494 if No (Par_Spec) then
2497 Par_Lib := Defining_Entity (Unit (Par_Spec));
2501 -- Loop through context items
2503 Item := First (Context_Items (N));
2504 while Present (Item) loop
2506 -- Ada 2005 (AI-262): Allow private_with of a private child package
2507 -- in public siblings
2509 if Nkind (Item) = N_With_Clause
2510 and then not Implicit_With (Item)
2511 and then Is_Private_Descendant (Entity (Name (Item)))
2513 Priv_Child := Entity (Name (Item));
2516 Curr_Parent : Entity_Id := Par_Lib;
2517 Child_Parent : Entity_Id := Scope (Priv_Child);
2518 Prv_Ancestor : Entity_Id := Child_Parent;
2519 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2522 -- If the child unit is a public child then locate
2523 -- the nearest private ancestor; Child_Parent will
2524 -- then be set to the parent of that ancestor.
2526 if not Is_Private_Library_Unit (Priv_Child) then
2527 while Present (Prv_Ancestor)
2528 and then not Is_Private_Library_Unit (Prv_Ancestor)
2530 Prv_Ancestor := Scope (Prv_Ancestor);
2533 if Present (Prv_Ancestor) then
2534 Child_Parent := Scope (Prv_Ancestor);
2538 while Present (Curr_Parent)
2539 and then Curr_Parent /= Standard_Standard
2540 and then Curr_Parent /= Child_Parent
2543 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2544 Curr_Parent := Scope (Curr_Parent);
2547 if No (Curr_Parent) then
2548 Curr_Parent := Standard_Standard;
2551 if Curr_Parent /= Child_Parent then
2552 if Ekind (Priv_Child) = E_Generic_Package
2553 and then Chars (Priv_Child) in Text_IO_Package_Name
2554 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2557 ("& is a nested package, not a compilation unit",
2558 Name (Item), Priv_Child);
2562 ("unit in with clause is private child unit!", Item);
2564 ("\current unit must also have parent&!",
2565 Item, Child_Parent);
2568 elsif not Curr_Private
2569 and then not Private_Present (Item)
2570 and then Nkind (Lib_Unit) /= N_Package_Body
2571 and then Nkind (Lib_Unit) /= N_Subprogram_Body
2572 and then Nkind (Lib_Unit) /= N_Subunit
2575 ("current unit must also be private descendant of&",
2576 Item, Child_Parent);
2584 end Check_Private_Child_Unit;
2586 ----------------------
2587 -- Check_Stub_Level --
2588 ----------------------
2590 procedure Check_Stub_Level (N : Node_Id) is
2591 Par : constant Node_Id := Parent (N);
2592 Kind : constant Node_Kind := Nkind (Par);
2595 if (Kind = N_Package_Body
2596 or else Kind = N_Subprogram_Body
2597 or else Kind = N_Task_Body
2598 or else Kind = N_Protected_Body)
2599 and then (Nkind (Parent (Par)) = N_Compilation_Unit
2600 or else Nkind (Parent (Par)) = N_Subunit)
2604 -- In an instance, a missing stub appears at any level. A warning
2605 -- message will have been emitted already for the missing file.
2607 elsif not In_Instance then
2608 Error_Msg_N ("stub cannot appear in an inner scope", N);
2610 elsif Expander_Active then
2611 Error_Msg_N ("missing proper body", N);
2613 end Check_Stub_Level;
2615 ------------------------
2616 -- Expand_With_Clause --
2617 ------------------------
2619 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2620 Loc : constant Source_Ptr := Sloc (Nam);
2621 Ent : constant Entity_Id := Entity (Nam);
2625 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2626 -- Comment requireed here ???
2628 ---------------------
2629 -- Build_Unit_Name --
2630 ---------------------
2632 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2636 if Nkind (Nam) = N_Identifier then
2637 return New_Occurrence_Of (Entity (Nam), Loc);
2641 Make_Expanded_Name (Loc,
2642 Chars => Chars (Entity (Nam)),
2643 Prefix => Build_Unit_Name (Prefix (Nam)),
2644 Selector_Name => New_Occurrence_Of (Entity (Nam), Loc));
2645 Set_Entity (Result, Entity (Nam));
2648 end Build_Unit_Name;
2650 -- Start of processing for Expand_With_Clause
2653 New_Nodes_OK := New_Nodes_OK + 1;
2655 Make_With_Clause (Loc, Name => Build_Unit_Name (Nam));
2657 P := Parent (Unit_Declaration_Node (Ent));
2658 Set_Library_Unit (Withn, P);
2659 Set_Corresponding_Spec (Withn, Ent);
2660 Set_First_Name (Withn, True);
2661 Set_Implicit_With (Withn, True);
2663 -- If the unit is a package declaration, a private_with_clause on a
2664 -- child unit implies that the implicit with on the parent is also
2667 if Nkind (Unit (N)) = N_Package_Declaration then
2668 Set_Private_Present (Withn, Private_Present (Item));
2671 Prepend (Withn, Context_Items (N));
2672 Mark_Rewrite_Insertion (Withn);
2673 Install_Withed_Unit (Withn);
2675 if Nkind (Nam) = N_Expanded_Name then
2676 Expand_With_Clause (Item, Prefix (Nam), N);
2679 New_Nodes_OK := New_Nodes_OK - 1;
2680 end Expand_With_Clause;
2682 -----------------------
2683 -- Get_Parent_Entity --
2684 -----------------------
2686 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2688 if Nkind (Unit) = N_Package_Body
2689 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2693 (Specification (Instance_Spec (Original_Node (Unit))));
2695 elsif Nkind (Unit) = N_Package_Instantiation then
2696 return Defining_Entity (Specification (Instance_Spec (Unit)));
2699 return Defining_Entity (Unit);
2701 end Get_Parent_Entity;
2703 -----------------------------
2704 -- Implicit_With_On_Parent --
2705 -----------------------------
2707 procedure Implicit_With_On_Parent
2708 (Child_Unit : Node_Id;
2711 Loc : constant Source_Ptr := Sloc (N);
2712 P : constant Node_Id := Parent_Spec (Child_Unit);
2714 P_Unit : Node_Id := Unit (P);
2716 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
2719 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
2720 -- Build prefix of child unit name. Recurse if needed
2722 function Build_Unit_Name return Node_Id;
2723 -- If the unit is a child unit, build qualified name with all
2726 -------------------------
2727 -- Build_Ancestor_Name --
2728 -------------------------
2730 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
2731 P_Ref : constant Node_Id :=
2732 New_Reference_To (Defining_Entity (P), Loc);
2733 P_Spec : Node_Id := P;
2736 -- Ancestor may have been rewritten as a package body. Retrieve
2737 -- the original spec to trace earlier ancestors.
2739 if Nkind (P) = N_Package_Body
2740 and then Nkind (Original_Node (P)) = N_Package_Instantiation
2742 P_Spec := Original_Node (P);
2745 if No (Parent_Spec (P_Spec)) then
2749 Make_Selected_Component (Loc,
2750 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
2751 Selector_Name => P_Ref);
2753 end Build_Ancestor_Name;
2755 ---------------------
2756 -- Build_Unit_Name --
2757 ---------------------
2759 function Build_Unit_Name return Node_Id is
2762 if No (Parent_Spec (P_Unit)) then
2763 return New_Reference_To (P_Name, Loc);
2766 Make_Expanded_Name (Loc,
2767 Chars => Chars (P_Name),
2768 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
2769 Selector_Name => New_Reference_To (P_Name, Loc));
2770 Set_Entity (Result, P_Name);
2773 end Build_Unit_Name;
2775 -- Start of processing for Implicit_With_On_Parent
2778 -- The unit of the current compilation may be a package body
2779 -- that replaces an instance node. In this case we need the
2780 -- original instance node to construct the proper parent name.
2782 if Nkind (P_Unit) = N_Package_Body
2783 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
2785 P_Unit := Original_Node (P_Unit);
2788 -- We add the implicit with if the child unit is the current unit
2789 -- being compiled. If the current unit is a body, we do not want
2790 -- to add an implicit_with a second time to the corresponding spec.
2792 if Nkind (Child_Unit) = N_Package_Declaration
2793 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
2798 New_Nodes_OK := New_Nodes_OK + 1;
2799 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
2801 Set_Library_Unit (Withn, P);
2802 Set_Corresponding_Spec (Withn, P_Name);
2803 Set_First_Name (Withn, True);
2804 Set_Implicit_With (Withn, True);
2806 -- Node is placed at the beginning of the context items, so that
2807 -- subsequent use clauses on the parent can be validated.
2809 Prepend (Withn, Context_Items (N));
2810 Mark_Rewrite_Insertion (Withn);
2811 Install_Withed_Unit (Withn);
2813 if Is_Child_Spec (P_Unit) then
2814 Implicit_With_On_Parent (P_Unit, N);
2817 New_Nodes_OK := New_Nodes_OK - 1;
2818 end Implicit_With_On_Parent;
2824 function In_Chain (E : Entity_Id) return Boolean is
2828 H := Current_Entity (E);
2829 while Present (H) loop
2840 ---------------------
2841 -- Install_Context --
2842 ---------------------
2844 procedure Install_Context (N : Node_Id) is
2845 Lib_Unit : constant Node_Id := Unit (N);
2848 Install_Context_Clauses (N);
2850 if Is_Child_Spec (Lib_Unit) then
2851 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
2854 Install_Limited_Context_Clauses (N);
2856 end Install_Context;
2858 -----------------------------
2859 -- Install_Context_Clauses --
2860 -----------------------------
2862 procedure Install_Context_Clauses (N : Node_Id) is
2863 Lib_Unit : constant Node_Id := Unit (N);
2865 Uname_Node : Entity_Id;
2866 Check_Private : Boolean := False;
2867 Decl_Node : Node_Id;
2868 Lib_Parent : Entity_Id;
2871 -- First skip configuration pragmas at the start of the context. They
2872 -- are not technically part of the context clause, but that's where the
2873 -- parser puts them. Note they were analyzed in Analyze_Context.
2875 Item := First (Context_Items (N));
2876 while Present (Item)
2877 and then Nkind (Item) = N_Pragma
2878 and then Chars (Item) in Configuration_Pragma_Names
2883 -- Loop through the actual context clause items. We process everything
2884 -- except Limited_With clauses in this routine. Limited_With clauses
2885 -- are separately installed (see Install_Limited_Context_Clauses).
2887 while Present (Item) loop
2889 -- Case of explicit WITH clause
2891 if Nkind (Item) = N_With_Clause
2892 and then not Implicit_With (Item)
2894 if Limited_Present (Item) then
2896 -- Limited withed units will be installed later
2900 -- If Name (Item) is not an entity name, something is wrong, and
2901 -- this will be detected in due course, for now ignore the item
2903 elsif not Is_Entity_Name (Name (Item)) then
2906 elsif No (Entity (Name (Item))) then
2907 Set_Entity (Name (Item), Any_Id);
2911 Uname_Node := Entity (Name (Item));
2913 if Is_Private_Descendant (Uname_Node) then
2914 Check_Private := True;
2917 Install_Withed_Unit (Item);
2919 Decl_Node := Unit_Declaration_Node (Uname_Node);
2921 -- If the unit is a subprogram instance, it appears nested
2922 -- within a package that carries the parent information.
2924 if Is_Generic_Instance (Uname_Node)
2925 and then Ekind (Uname_Node) /= E_Package
2927 Decl_Node := Parent (Parent (Decl_Node));
2930 if Is_Child_Spec (Decl_Node) then
2931 if Nkind (Name (Item)) = N_Expanded_Name then
2932 Expand_With_Clause (Item, Prefix (Name (Item)), N);
2934 -- if not an expanded name, the child unit must be a
2935 -- renaming, nothing to do.
2940 elsif Nkind (Decl_Node) = N_Subprogram_Body
2941 and then not Acts_As_Spec (Parent (Decl_Node))
2942 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
2944 Implicit_With_On_Parent
2945 (Unit (Library_Unit (Parent (Decl_Node))), N);
2948 -- Check license conditions unless this is a dummy unit
2950 if Sloc (Library_Unit (Item)) /= No_Location then
2951 License_Check : declare
2953 Withu : constant Unit_Number_Type :=
2954 Get_Source_Unit (Library_Unit (Item));
2956 Withl : constant License_Type :=
2957 License (Source_Index (Withu));
2959 Unitl : constant License_Type :=
2960 License (Source_Index (Current_Sem_Unit));
2962 procedure License_Error;
2963 -- Signal error of bad license
2969 procedure License_Error is
2972 ("?license of with'ed unit & may be inconsistent",
2976 -- Start of processing for License_Check
2979 -- Exclude license check if withed unit is an internal unit.
2980 -- This situation arises e.g. with the GPL version of GNAT.
2982 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
2985 -- Otherwise check various cases
2997 if Withl = Restricted then
3001 when Modified_GPL =>
3002 if Withl = Restricted or else Withl = GPL then
3006 when Unrestricted =>
3013 -- Case of USE PACKAGE clause
3015 elsif Nkind (Item) = N_Use_Package_Clause then
3016 Analyze_Use_Package (Item);
3018 -- Case of USE TYPE clause
3020 elsif Nkind (Item) = N_Use_Type_Clause then
3021 Analyze_Use_Type (Item);
3025 elsif Nkind (Item) = N_Pragma then
3033 if Is_Child_Spec (Lib_Unit) then
3035 -- The unit also has implicit withs on its own parents
3037 if No (Context_Items (N)) then
3038 Set_Context_Items (N, New_List);
3041 Implicit_With_On_Parent (Lib_Unit, N);
3044 -- If the unit is a body, the context of the specification must also
3047 if Nkind (Lib_Unit) = N_Package_Body
3048 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3049 and then not Acts_As_Spec (N))
3051 Install_Context (Library_Unit (N));
3053 if Is_Child_Spec (Unit (Library_Unit (N))) then
3055 -- If the unit is the body of a public child unit, the private
3056 -- declarations of the parent must be made visible. If the child
3057 -- unit is private, the private declarations have been installed
3058 -- already in the call to Install_Parents for the spec. Installing
3059 -- private declarations must be done for all ancestors of public
3060 -- child units. In addition, sibling units mentioned in the
3061 -- context clause of the body are directly visible.
3069 Lib_Spec := Unit (Library_Unit (N));
3070 while Is_Child_Spec (Lib_Spec) loop
3071 P := Unit (Parent_Spec (Lib_Spec));
3072 P_Name := Defining_Entity (P);
3074 if not (Private_Present (Parent (Lib_Spec)))
3075 and then not In_Private_Part (P_Name)
3077 Install_Private_Declarations (P_Name);
3078 Install_Private_With_Clauses (P_Name);
3079 Set_Use (Private_Declarations (Specification (P)));
3087 -- For a package body, children in context are immediately visible
3089 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3092 if Nkind (Lib_Unit) = N_Generic_Package_Declaration
3093 or else Nkind (Lib_Unit) = N_Generic_Subprogram_Declaration
3094 or else Nkind (Lib_Unit) = N_Package_Declaration
3095 or else Nkind (Lib_Unit) = N_Subprogram_Declaration
3097 if Is_Child_Spec (Lib_Unit) then
3098 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3099 Set_Is_Private_Descendant
3100 (Defining_Entity (Lib_Unit),
3101 Is_Private_Descendant (Lib_Parent)
3102 or else Private_Present (Parent (Lib_Unit)));
3105 Set_Is_Private_Descendant
3106 (Defining_Entity (Lib_Unit),
3107 Private_Present (Parent (Lib_Unit)));
3111 if Check_Private then
3112 Check_Private_Child_Unit (N);
3114 end Install_Context_Clauses;
3116 -------------------------------------
3117 -- Install_Limited_Context_Clauses --
3118 -------------------------------------
3120 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3123 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3124 -- Check that the unlimited view of a given compilation_unit is not
3125 -- already visible through "use + renamings".
3127 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3128 -- Check that if a limited_with clause of a given compilation_unit
3129 -- mentions a descendant of a private child of some library unit,
3130 -- then the given compilation_unit shall be the declaration of a
3131 -- private descendant of that library unit.
3133 procedure Expand_Limited_With_Clause
3134 (Comp_Unit : Node_Id; Nam : Node_Id; N : Node_Id);
3135 -- If a child unit appears in a limited_with clause, there are implicit
3136 -- limited_with clauses on all parents that are not already visible
3137 -- through a regular with clause. This procedure creates the implicit
3138 -- limited with_clauses for the parents and loads the corresponding
3139 -- units. The shadow entities are created when the inserted clause is
3140 -- analyzed. Implements Ada 2005 (AI-50217).
3142 ---------------------
3143 -- Check_Renamings --
3144 ---------------------
3146 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3155 pragma Assert (Nkind (W) = N_With_Clause);
3157 -- Protect the frontend against previous critical errors
3159 case Nkind (Unit (Library_Unit (W))) is
3160 when N_Subprogram_Declaration |
3161 N_Package_Declaration |
3162 N_Generic_Subprogram_Declaration |
3163 N_Generic_Package_Declaration =>
3170 -- Check "use + renamings"
3172 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3173 Spec := Specification (Unit (P));
3175 Item := First (Visible_Declarations (Spec));
3176 while Present (Item) loop
3178 -- Look only at use package clauses
3180 if Nkind (Item) = N_Use_Package_Clause then
3182 -- Traverse the list of packages
3184 Nam := First (Names (Item));
3185 while Present (Nam) loop
3188 pragma Assert (Present (Parent (E)));
3190 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3191 and then Renamed_Entity (E) = WEnt
3193 -- The unlimited view is visible through use clause and
3194 -- renamings. There is not need to generate the error
3195 -- message here because Is_Visible_Through_Renamings
3196 -- takes care of generating the precise error message.
3200 elsif Nkind (Parent (E)) = N_Package_Specification then
3202 -- The use clause may refer to a local package.
3203 -- Check all the enclosing scopes.
3206 while E2 /= Standard_Standard
3207 and then E2 /= WEnt loop
3213 ("unlimited view visible through use clause ", W);
3225 -- Recursive call to check all the ancestors
3227 if Is_Child_Spec (Unit (P)) then
3228 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3230 end Check_Renamings;
3232 ---------------------------------------
3233 -- Check_Private_Limited_Withed_Unit --
3234 ---------------------------------------
3236 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3237 Curr_Parent : Node_Id;
3238 Child_Parent : Node_Id;
3241 -- Compilation unit of the parent of the withed library unit
3243 Child_Parent := Parent_Spec (Unit (Library_Unit (Item)));
3245 -- If the child unit is a public child, then locate its nearest
3246 -- private ancestor, if any; Child_Parent will then be set to
3247 -- the parent of that ancestor.
3249 if not Private_Present (Library_Unit (Item)) then
3250 while Present (Child_Parent)
3251 and then not Private_Present (Child_Parent)
3253 Child_Parent := Parent_Spec (Unit (Child_Parent));
3256 if No (Child_Parent) then
3260 Child_Parent := Parent_Spec (Unit (Child_Parent));
3263 -- Traverse all the ancestors of the current compilation
3264 -- unit to check if it is a descendant of named library unit.
3266 Curr_Parent := Parent (Item);
3268 while Present (Parent_Spec (Unit (Curr_Parent)))
3269 and then Curr_Parent /= Child_Parent
3271 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3274 if Curr_Parent /= Child_Parent then
3276 ("unit in with clause is private child unit!", Item);
3278 ("\current unit must also have parent&!",
3279 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3281 elsif not Private_Present (Parent (Item))
3282 and then not Private_Present (Item)
3283 and then Nkind (Unit (Parent (Item))) /= N_Package_Body
3284 and then Nkind (Unit (Parent (Item))) /= N_Subprogram_Body
3285 and then Nkind (Unit (Parent (Item))) /= N_Subunit
3288 ("current unit must also be private descendant of&",
3289 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3291 end Check_Private_Limited_Withed_Unit;
3293 --------------------------------
3294 -- Expand_Limited_With_Clause --
3295 --------------------------------
3297 procedure Expand_Limited_With_Clause
3298 (Comp_Unit : Node_Id;
3302 Loc : constant Source_Ptr := Sloc (Nam);
3303 Unum : Unit_Number_Type;
3306 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3307 -- Returns true if the context already includes a with_clause for
3308 -- this unit. If the with_clause is non-limited, the unit is fully
3309 -- visible and an implicit limited_with should not be created. If
3310 -- there is already a limited_with clause for W, a second one is
3311 -- simply redundant.
3313 --------------------------
3314 -- Previous_Withed_Unit --
3315 --------------------------
3317 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3321 -- A limited with_clause cannot appear in the same context_clause
3322 -- as a nonlimited with_clause which mentions the same library.
3324 Item := First (Context_Items (Comp_Unit));
3325 while Present (Item) loop
3326 if Nkind (Item) = N_With_Clause
3327 and then Library_Unit (Item) = Library_Unit (W)
3336 end Previous_Withed_Unit;
3338 -- Start of processing for Expand_Limited_With_Clause
3341 New_Nodes_OK := New_Nodes_OK + 1;
3343 if Nkind (Nam) = N_Identifier then
3345 -- Create node for name of withed unit
3348 Make_With_Clause (Loc,
3349 Name => New_Copy (Nam));
3351 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3353 Make_With_Clause (Loc,
3354 Name => Make_Selected_Component (Loc,
3355 Prefix => New_Copy_Tree (Prefix (Nam)),
3356 Selector_Name => New_Copy (Selector_Name (Nam))));
3357 Set_Parent (Withn, Parent (N));
3360 Set_Limited_Present (Withn);
3361 Set_First_Name (Withn);
3362 Set_Implicit_With (Withn);
3366 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3371 -- Do not generate a limited_with_clause on the current unit.
3372 -- This path is taken when a unit has a limited_with clause on
3373 -- one of its child units.
3375 if Unum = Current_Sem_Unit then
3379 Set_Library_Unit (Withn, Cunit (Unum));
3380 Set_Corresponding_Spec
3381 (Withn, Specification (Unit (Cunit (Unum))));
3383 if not Previous_Withed_Unit (Withn) then
3384 Prepend (Withn, Context_Items (Parent (N)));
3385 Mark_Rewrite_Insertion (Withn);
3387 -- Add implicit limited_with_clauses for parents of child units
3388 -- mentioned in limited_with clauses.
3390 if Nkind (Nam) = N_Selected_Component then
3391 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3396 if not Limited_View_Installed (Withn) then
3397 Install_Limited_Withed_Unit (Withn);
3401 New_Nodes_OK := New_Nodes_OK - 1;
3402 end Expand_Limited_With_Clause;
3404 -- Start of processing for Install_Limited_Context_Clauses
3407 Item := First (Context_Items (N));
3408 while Present (Item) loop
3409 if Nkind (Item) = N_With_Clause
3410 and then Limited_Present (Item)
3412 if Nkind (Name (Item)) = N_Selected_Component then
3413 Expand_Limited_With_Clause
3414 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3417 Check_Private_Limited_Withed_Unit (Item);
3419 if not Implicit_With (Item)
3420 and then Is_Child_Spec (Unit (N))
3422 Check_Renamings (Parent_Spec (Unit (N)), Item);
3425 -- A unit may have a limited with on itself if it has a
3426 -- limited with_clause on one of its child units. In that
3427 -- case it is already being compiled and it makes no sense
3428 -- to install its limited view.
3430 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3431 and then not Limited_View_Installed (Item)
3433 Install_Limited_Withed_Unit (Item);
3436 -- All items other than Limited_With clauses are ignored (they were
3437 -- installed separately early on by Install_Context_Clause).
3446 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3447 -- spec, looking for incomplete subtype declarations of incomplete
3448 -- types visible through a limited with clause.
3450 if Ada_Version >= Ada_05
3451 and then Analyzed (N)
3452 and then Nkind (Unit (N)) = N_Package_Declaration
3457 Non_Lim_View : Entity_Id;
3460 Decl := First (Visible_Declarations (Specification (Unit (N))));
3461 while Present (Decl) loop
3462 if Nkind (Decl) = N_Subtype_Declaration
3464 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3466 From_With_Type (Defining_Identifier (Decl))
3468 Def_Id := Defining_Identifier (Decl);
3469 Non_Lim_View := Non_Limited_View (Def_Id);
3471 if not Is_Incomplete_Type (Non_Lim_View) then
3473 -- Convert an incomplete subtype declaration into a
3474 -- corresponding non-limited view subtype declaration.
3475 -- This is usually the case when analyzing a body that
3476 -- has regular with-clauses, when the spec has limited
3478 -- if the non-limited view is still incomplete, it is
3479 -- the dummy entry already created, and the declaration
3480 -- cannot be reanalyzed. This is the case when installing
3481 -- a parent unit that has limited with-clauses.
3483 Set_Subtype_Indication (Decl,
3484 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3485 Set_Etype (Def_Id, Non_Lim_View);
3486 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3487 Set_Analyzed (Decl, False);
3489 -- Reanalyze the declaration, suppressing the call to
3490 -- Enter_Name to avoid duplicate names.
3492 Analyze_Subtype_Declaration
3502 end Install_Limited_Context_Clauses;
3504 ---------------------
3505 -- Install_Parents --
3506 ---------------------
3508 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3515 P := Unit (Parent_Spec (Lib_Unit));
3516 P_Name := Get_Parent_Entity (P);
3518 if Etype (P_Name) = Any_Type then
3522 if Ekind (P_Name) = E_Generic_Package
3523 and then Nkind (Lib_Unit) /= N_Generic_Subprogram_Declaration
3524 and then Nkind (Lib_Unit) /= N_Generic_Package_Declaration
3525 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3528 ("child of a generic package must be a generic unit", Lib_Unit);
3530 elsif not Is_Package_Or_Generic_Package (P_Name) then
3532 ("parent unit must be package or generic package", Lib_Unit);
3533 raise Unrecoverable_Error;
3535 elsif Present (Renamed_Object (P_Name)) then
3536 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3537 raise Unrecoverable_Error;
3539 -- Verify that a child of an instance is itself an instance, or
3540 -- the renaming of one. Given that an instance that is a unit is
3541 -- replaced with a package declaration, check against the original
3542 -- node. The parent may be currently being instantiated, in which
3543 -- case it appears as a declaration, but the generic_parent is
3544 -- already established indicating that we deal with an instance.
3546 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3548 if Nkind (Lib_Unit) in N_Renaming_Declaration
3549 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3551 (Nkind (Lib_Unit) = N_Package_Declaration
3552 and then Present (Generic_Parent (Specification (Lib_Unit))))
3557 ("child of an instance must be an instance or renaming",
3562 -- This is the recursive call that ensures all parents are loaded
3564 if Is_Child_Spec (P) then
3566 Is_Private or else Private_Present (Parent (Lib_Unit)));
3569 -- Now we can install the context for this parent
3571 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3572 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3573 Install_Siblings (P_Name, Parent (Lib_Unit));
3575 -- The child unit is in the declarative region of the parent. The
3576 -- parent must therefore appear in the scope stack and be visible,
3577 -- as when compiling the corresponding body. If the child unit is
3578 -- private or it is a package body, private declarations must be
3579 -- accessible as well. Use declarations in the parent must also
3580 -- be installed. Finally, other child units of the same parent that
3581 -- are in the context are immediately visible.
3583 -- Find entity for compilation unit, and set its private descendant
3584 -- status as needed.
3586 E_Name := Defining_Entity (Lib_Unit);
3588 Set_Is_Child_Unit (E_Name);
3590 Set_Is_Private_Descendant (E_Name,
3591 Is_Private_Descendant (P_Name)
3592 or else Private_Present (Parent (Lib_Unit)));
3594 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3595 Push_Scope (P_Name);
3597 -- Save current visibility of unit
3599 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3600 Is_Immediately_Visible (P_Name);
3601 Set_Is_Immediately_Visible (P_Name);
3602 Install_Visible_Declarations (P_Name);
3603 Set_Use (Visible_Declarations (P_Spec));
3605 -- If the parent is a generic unit, its formal part may contain
3606 -- formal packages and use clauses for them.
3608 if Ekind (P_Name) = E_Generic_Package then
3609 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3613 or else Private_Present (Parent (Lib_Unit))
3615 Install_Private_Declarations (P_Name);
3616 Install_Private_With_Clauses (P_Name);
3617 Set_Use (Private_Declarations (P_Spec));
3619 end Install_Parents;
3621 ----------------------------------
3622 -- Install_Private_With_Clauses --
3623 ----------------------------------
3625 procedure Install_Private_With_Clauses (P : Entity_Id) is
3626 Decl : constant Node_Id := Unit_Declaration_Node (P);
3630 if Debug_Flag_I then
3631 Write_Str ("install private with clauses of ");
3632 Write_Name (Chars (P));
3636 if Nkind (Parent (Decl)) = N_Compilation_Unit then
3637 Item := First (Context_Items (Parent (Decl)));
3638 while Present (Item) loop
3639 if Nkind (Item) = N_With_Clause
3640 and then Private_Present (Item)
3642 if Limited_Present (Item) then
3643 if not Limited_View_Installed (Item) then
3644 Install_Limited_Withed_Unit (Item);
3647 Install_Withed_Unit (Item, Private_With_OK => True);
3654 end Install_Private_With_Clauses;
3656 ----------------------
3657 -- Install_Siblings --
3658 ----------------------
3660 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
3665 -- Iterate over explicit with clauses, and check whether the
3666 -- scope of each entity is an ancestor of the current unit, in
3667 -- which case it is immediately visible.
3669 Item := First (Context_Items (N));
3670 while Present (Item) loop
3672 -- Do not install private_with_clauses if the unit is a package
3673 -- declaration, unless it is itself a private child unit.
3675 if Nkind (Item) = N_With_Clause
3676 and then not Implicit_With (Item)
3677 and then not Limited_Present (Item)
3679 (not Private_Present (Item)
3680 or else Nkind (Unit (N)) /= N_Package_Declaration
3681 or else Private_Present (N))
3683 Id := Entity (Name (Item));
3685 if Is_Child_Unit (Id)
3686 and then Is_Ancestor_Package (Scope (Id), U_Name)
3688 Set_Is_Immediately_Visible (Id);
3690 -- Check for the presence of another unit in the context,
3691 -- that may be inadvertently hidden by the child.
3693 Prev := Current_Entity (Id);
3696 and then Is_Immediately_Visible (Prev)
3697 and then not Is_Child_Unit (Prev)
3703 Clause := First (Context_Items (N));
3704 while Present (Clause) loop
3705 if Nkind (Clause) = N_With_Clause
3706 and then Entity (Name (Clause)) = Prev
3709 ("child unit& hides compilation unit " &
3710 "with the same name?",
3720 -- The With_Clause may be on a grand-child or one of its
3721 -- further descendants, which makes a child immediately visible.
3722 -- Examine ancestry to determine whether such a child exists.
3723 -- For example, if current unit is A.C, and with_clause is on
3724 -- A.X.Y.Z, then X is immediately visible.
3726 elsif Is_Child_Unit (Id) then
3732 while Is_Child_Unit (Par) loop
3733 if Is_Ancestor_Package (Scope (Par), U_Name) then
3734 Set_Is_Immediately_Visible (Par);
3746 end Install_Siblings;
3748 -------------------------------
3749 -- Install_Limited_With_Unit --
3750 -------------------------------
3752 procedure Install_Limited_Withed_Unit (N : Node_Id) is
3753 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
3756 Is_Child_Package : Boolean := False;
3758 Lim_Header : Entity_Id;
3759 Lim_Typ : Entity_Id;
3761 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
3762 -- Check if some package installed though normal with-clauses has a
3763 -- renaming declaration of package P. AARM 10.1.2(21/2).
3765 ----------------------------------
3766 -- Is_Visible_Through_Renamings --
3767 ----------------------------------
3769 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
3770 Kind : constant Node_Kind :=
3771 Nkind (Unit (Cunit (Current_Sem_Unit)));
3777 -- Example of the error detected by this subprogram:
3785 -- package Ren_P renames P;
3791 -- limited with P; -- ERROR
3792 -- package R.C is ...
3794 Aux_Unit := Cunit (Current_Sem_Unit);
3797 Item := First (Context_Items (Aux_Unit));
3798 while Present (Item) loop
3799 if Nkind (Item) = N_With_Clause
3800 and then not Limited_Present (Item)
3801 and then Nkind (Unit (Library_Unit (Item)))
3802 = N_Package_Declaration
3805 First (Visible_Declarations
3806 (Specification (Unit (Library_Unit (Item)))));
3807 while Present (Decl) loop
3808 if Nkind (Decl) = N_Package_Renaming_Declaration
3809 and then Entity (Name (Decl)) = P
3811 -- Generate the error message only if the current unit
3812 -- is a package declaration; in case of subprogram
3813 -- bodies and package bodies we just return true to
3814 -- indicate that the limited view must not be
3817 if Kind = N_Package_Declaration then
3819 ("simultaneous visibility of the limited and" &
3820 " unlimited views not allowed", N);
3821 Error_Msg_Sloc := Sloc (Item);
3823 ("\unlimited view of & visible through the" &
3824 " context clause found #", N, P);
3825 Error_Msg_Sloc := Sloc (Decl);
3826 Error_Msg_NE ("\and the renaming found #", N, P);
3839 if Present (Library_Unit (Aux_Unit)) then
3840 if Aux_Unit = Library_Unit (Aux_Unit) then
3842 -- Aux_Unit is a body that acts as a spec. Clause has
3843 -- already been flagged as illegal.
3848 Aux_Unit := Library_Unit (Aux_Unit);
3851 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
3854 exit when No (Aux_Unit);
3858 end Is_Visible_Through_Renamings;
3860 -- Start of processing for Install_Limited_Withed_Unit
3863 pragma Assert (not Limited_View_Installed (N));
3865 -- In case of limited with_clause on subprograms, generics, instances,
3866 -- or renamings, the corresponding error was previously posted and we
3867 -- have nothing to do here.
3869 if Nkind (P_Unit) /= N_Package_Declaration then
3873 P := Defining_Unit_Name (Specification (P_Unit));
3875 -- Handle child packages
3877 if Nkind (P) = N_Defining_Program_Unit_Name then
3878 Is_Child_Package := True;
3879 P := Defining_Identifier (P);
3882 -- Do not install the limited-view if the full-view is already visible
3883 -- through renaming declarations.
3885 if Is_Visible_Through_Renamings (P) then
3889 -- Do not install the limited view if this is the unit being analyzed.
3890 -- This unusual case will happen when a unit has a limited_with clause
3891 -- on one of its children. The compilation of the child forces the
3892 -- load of the parent which tries to install the limited view of the
3895 if P = Cunit_Entity (Current_Sem_Unit) then
3899 -- A common use of the limited-with is to have a limited-with
3900 -- in the package spec, and a normal with in its package body.
3903 -- limited with X; -- [1]
3907 -- package body A is ...
3909 -- The compilation of A's body installs the context clauses found at [2]
3910 -- and then the context clauses of its specification (found at [1]). As
3911 -- a consequence, at [1] the specification of X has been analyzed and it
3912 -- is immediately visible. According to the semantics of limited-with
3913 -- context clauses we don't install the limited view because the full
3914 -- view of X supersedes its limited view.
3916 if Analyzed (P_Unit)
3917 and then (Is_Immediately_Visible (P)
3918 or else (Is_Child_Package
3919 and then Is_Visible_Child_Unit (P)))
3921 -- Ada 2005 (AI-262): Install the private declarations of P
3923 if Private_Present (N)
3924 and then not In_Private_Part (P)
3930 Id := First_Private_Entity (P);
3931 while Present (Id) loop
3932 if not Is_Internal (Id)
3933 and then not Is_Child_Unit (Id)
3935 if not In_Chain (Id) then
3936 Set_Homonym (Id, Current_Entity (Id));
3937 Set_Current_Entity (Id);
3940 Set_Is_Immediately_Visible (Id);
3946 Set_In_Private_Part (P);
3953 if Debug_Flag_I then
3954 Write_Str ("install limited view of ");
3955 Write_Name (Chars (P));
3959 -- If the unit has not been analyzed and the limited view has not been
3960 -- already installed then we install it.
3962 if not Analyzed (P_Unit) then
3963 if not In_Chain (P) then
3965 -- Minimum decoration
3967 Set_Ekind (P, E_Package);
3968 Set_Etype (P, Standard_Void_Type);
3969 Set_Scope (P, Standard_Standard);
3971 if Is_Child_Package then
3972 Set_Is_Child_Unit (P);
3973 Set_Is_Visible_Child_Unit (P);
3974 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
3977 -- Place entity on visibility structure
3979 Set_Homonym (P, Current_Entity (P));
3980 Set_Current_Entity (P);
3982 if Debug_Flag_I then
3983 Write_Str (" (homonym) chain ");
3984 Write_Name (Chars (P));
3988 -- Install the incomplete view. The first element of the limited
3989 -- view is a header (an E_Package entity) used to reference the
3990 -- first shadow entity in the private part of the package.
3992 Lim_Header := Limited_View (P);
3993 Lim_Typ := First_Entity (Lim_Header);
3995 while Present (Lim_Typ)
3996 and then Lim_Typ /= First_Private_Entity (Lim_Header)
3998 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
3999 Set_Current_Entity (Lim_Typ);
4001 if Debug_Flag_I then
4002 Write_Str (" (homonym) chain ");
4003 Write_Name (Chars (Lim_Typ));
4007 Next_Entity (Lim_Typ);
4011 -- If the unit appears in a previous regular with_clause, the regular
4012 -- entities of the public part of the withed package must be replaced
4013 -- by the shadow ones.
4015 -- This code must be kept synchronized with the code that replaces the
4016 -- the shadow entities by the real entities (see body of Remove_Limited
4017 -- With_Clause); otherwise the contents of the homonym chains are not
4021 -- Hide all the type entities of the public part of the package to
4022 -- avoid its usage. This is needed to cover all the subtype decla-
4023 -- rations because we do not remove them from the homonym chain.
4025 E := First_Entity (P);
4026 while Present (E) and then E /= First_Private_Entity (P) loop
4028 Set_Was_Hidden (E, Is_Hidden (E));
4035 -- Replace the real entities by the shadow entities of the limited
4036 -- view. The first element of the limited view is a header that is
4037 -- used to reference the first shadow entity in the private part
4040 Lim_Header := Limited_View (P);
4042 Lim_Typ := First_Entity (Lim_Header);
4043 while Present (Lim_Typ)
4044 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4046 pragma Assert (not In_Chain (Lim_Typ));
4048 -- Do not unchain nested packages and child units
4050 if Ekind (Lim_Typ) /= E_Package
4051 and then not Is_Child_Unit (Lim_Typ)
4057 Prev := Current_Entity (Lim_Typ);
4059 -- Handle incomplete types
4061 if Ekind (Prev) = E_Incomplete_Type
4062 and then Present (Full_View (Prev))
4064 E := Full_View (Prev);
4069 -- Replace E in the homonyms list
4071 if E = Non_Limited_View (Lim_Typ) then
4072 Set_Homonym (Lim_Typ, Homonym (Prev));
4073 Set_Current_Entity (Lim_Typ);
4077 E := Homonym (Prev);
4078 pragma Assert (Present (E));
4080 -- Handle incomplete types
4082 if Ekind (E) = E_Incomplete_Type then
4086 exit when E = Non_Limited_View (Lim_Typ);
4088 Prev := Homonym (Prev);
4091 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4092 Set_Homonym (Prev, Lim_Typ);
4096 if Debug_Flag_I then
4097 Write_Str (" (homonym) chain ");
4098 Write_Name (Chars (Lim_Typ));
4103 Next_Entity (Lim_Typ);
4107 -- The package must be visible while the limited-with clause is active
4108 -- because references to the type P.T must resolve in the usual way.
4109 -- In addition, we remember that the limited-view has been installed to
4110 -- uninstall it at the point of context removal.
4112 Set_Is_Immediately_Visible (P);
4113 Set_Limited_View_Installed (N);
4115 -- If the package in the limited_with clause is a child unit, the
4116 -- clause is unanalyzed and appears as a selected component. Recast
4117 -- it as an expanded name so that the entity can be properly set. Use
4118 -- entity of parent, if available, for higher ancestors in the name.
4120 if Nkind (Name (N)) = N_Selected_Component then
4128 while Nkind (Nam) = N_Selected_Component
4129 and then Present (Ent)
4131 Change_Selected_Component_To_Expanded_Name (Nam);
4133 -- Set entity of parent identifiers if the unit is a child
4134 -- unit. This ensures that the tree is properly formed from
4135 -- semantic point of view (e.g. for ASIS queries).
4137 Set_Entity (Nam, Ent);
4139 Nam := Prefix (Nam);
4142 -- Set entity of last ancestor
4144 if Nkind (Nam) = N_Identifier then
4145 Set_Entity (Nam, Ent);
4151 Set_Entity (Name (N), P);
4152 Set_From_With_Type (P);
4153 end Install_Limited_Withed_Unit;
4155 -------------------------
4156 -- Install_Withed_Unit --
4157 -------------------------
4159 procedure Install_Withed_Unit
4160 (With_Clause : Node_Id;
4161 Private_With_OK : Boolean := False)
4163 Uname : constant Entity_Id := Entity (Name (With_Clause));
4164 P : constant Entity_Id := Scope (Uname);
4167 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4168 -- compiling a package declaration and the Private_With_OK flag was not
4169 -- set by the caller. These declarations will be installed later (before
4170 -- analyzing the private part of the package).
4172 if Private_Present (With_Clause)
4173 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
4174 and then not (Private_With_OK)
4179 if Debug_Flag_I then
4180 if Private_Present (With_Clause) then
4181 Write_Str ("install private withed unit ");
4183 Write_Str ("install withed unit ");
4186 Write_Name (Chars (Uname));
4190 -- We do not apply the restrictions to an internal unit unless
4191 -- we are compiling the internal unit as a main unit. This check
4192 -- is also skipped for dummy units (for missing packages).
4194 if Sloc (Uname) /= No_Location
4195 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
4196 or else Current_Sem_Unit = Main_Unit)
4198 Check_Restricted_Unit
4199 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
4202 if P /= Standard_Standard then
4204 -- If the unit is not analyzed after analysis of the with clause and
4205 -- it is an instantiation then it awaits a body and is the main unit.
4206 -- Its appearance in the context of some other unit indicates a
4207 -- circular dependency (DEC suite perversity).
4209 if not Analyzed (Uname)
4210 and then Nkind (Parent (Uname)) = N_Package_Instantiation
4213 ("instantiation depends on itself", Name (With_Clause));
4215 elsif not Is_Visible_Child_Unit (Uname) then
4216 Set_Is_Visible_Child_Unit (Uname);
4218 -- If the child unit appears in the context of its parent, it is
4219 -- immediately visible.
4221 if In_Open_Scopes (Scope (Uname)) then
4222 Set_Is_Immediately_Visible (Uname);
4225 if Is_Generic_Instance (Uname)
4226 and then Ekind (Uname) in Subprogram_Kind
4228 -- Set flag as well on the visible entity that denotes the
4229 -- instance, which renames the current one.
4231 Set_Is_Visible_Child_Unit
4233 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
4236 -- The parent unit may have been installed already, and may have
4237 -- appeared in a use clause.
4239 if In_Use (Scope (Uname)) then
4240 Set_Is_Potentially_Use_Visible (Uname);
4243 Set_Context_Installed (With_Clause);
4246 elsif not Is_Immediately_Visible (Uname) then
4247 if not Private_Present (With_Clause)
4248 or else Private_With_OK
4250 Set_Is_Immediately_Visible (Uname);
4253 Set_Context_Installed (With_Clause);
4256 -- A with-clause overrides a with-type clause: there are no restric-
4257 -- tions on the use of package entities.
4259 if Ekind (Uname) = E_Package then
4260 Set_From_With_Type (Uname, False);
4263 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4264 -- unit if there is a visible homograph for it declared in the same
4265 -- declarative region. This pathological case can only arise when an
4266 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4267 -- G1 has a generic child also named G2, and the context includes with_
4268 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4269 -- of I1.G2 visible as well. If the child unit is named Standard, do
4270 -- not apply the check to the Standard package itself.
4272 if Is_Child_Unit (Uname)
4273 and then Is_Visible_Child_Unit (Uname)
4274 and then Ada_Version >= Ada_05
4277 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
4283 U2 := Homonym (Uname);
4285 and U2 /= Standard_Standard
4288 Decl2 := Unit_Declaration_Node (P2);
4290 if Is_Child_Unit (U2)
4291 and then Is_Visible_Child_Unit (U2)
4293 if Is_Generic_Instance (P)
4294 and then Nkind (Decl1) = N_Package_Declaration
4295 and then Generic_Parent (Specification (Decl1)) = P2
4297 Error_Msg_N ("illegal with_clause", With_Clause);
4299 ("\child unit has visible homograph" &
4300 " ('R'M 8.3(26), 10.1.1(19))",
4304 elsif Is_Generic_Instance (P2)
4305 and then Nkind (Decl2) = N_Package_Declaration
4306 and then Generic_Parent (Specification (Decl2)) = P
4308 -- With_clause for child unit of instance appears before
4309 -- in the context. We want to place the error message on
4310 -- it, not on the generic child unit itself.
4313 Prev_Clause : Node_Id;
4316 Prev_Clause := First (List_Containing (With_Clause));
4317 while Entity (Name (Prev_Clause)) /= U2 loop
4321 pragma Assert (Present (Prev_Clause));
4322 Error_Msg_N ("illegal with_clause", Prev_Clause);
4324 ("\child unit has visible homograph" &
4325 " ('R'M 8.3(26), 10.1.1(19))",
4336 end Install_Withed_Unit;
4342 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
4343 K : constant Node_Kind := Nkind (Lib_Unit);
4346 return (K in N_Generic_Declaration or else
4347 K in N_Generic_Instantiation or else
4348 K in N_Generic_Renaming_Declaration or else
4349 K = N_Package_Declaration or else
4350 K = N_Package_Renaming_Declaration or else
4351 K = N_Subprogram_Declaration or else
4352 K = N_Subprogram_Renaming_Declaration)
4353 and then Present (Parent_Spec (Lib_Unit));
4356 -----------------------
4357 -- Load_Needed_Body --
4358 -----------------------
4360 -- N is a generic unit named in a with clause, or else it is
4361 -- a unit that contains a generic unit or an inlined function.
4362 -- In order to perform an instantiation, the body of the unit
4363 -- must be present. If the unit itself is generic, we assume
4364 -- that an instantiation follows, and load and analyze the body
4365 -- unconditionally. This forces analysis of the spec as well.
4367 -- If the unit is not generic, but contains a generic unit, it
4368 -- is loaded on demand, at the point of instantiation (see ch12).
4370 procedure Load_Needed_Body (N : Node_Id; OK : out Boolean) is
4371 Body_Name : Unit_Name_Type;
4372 Unum : Unit_Number_Type;
4374 Save_Style_Check : constant Boolean := Opt.Style_Check;
4375 -- The loading and analysis is done with style checks off
4378 if not GNAT_Mode then
4379 Style_Check := False;
4382 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
4385 (Load_Name => Body_Name,
4391 if Unum = No_Unit then
4395 Compiler_State := Analyzing; -- reset after load
4397 if not Fatal_Error (Unum) or else Try_Semantics then
4398 if Debug_Flag_L then
4399 Write_Str ("*** Loaded generic body");
4403 Semantics (Cunit (Unum));
4409 Style_Check := Save_Style_Check;
4410 end Load_Needed_Body;
4412 -------------------------
4413 -- Build_Limited_Views --
4414 -------------------------
4416 procedure Build_Limited_Views (N : Node_Id) is
4417 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
4418 P : constant Entity_Id := Cunit_Entity (Unum);
4420 Spec : Node_Id; -- To denote a package specification
4421 Lim_Typ : Entity_Id; -- To denote shadow entities
4422 Comp_Typ : Entity_Id; -- To denote real entities
4424 Lim_Header : Entity_Id; -- Package entity
4425 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
4426 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
4428 procedure Decorate_Incomplete_Type
4431 -- Add attributes of an incomplete type to a shadow entity. The same
4432 -- attributes are placed on the real entity, so that gigi receives
4433 -- a consistent view.
4435 procedure Decorate_Package_Specification (P : Entity_Id);
4436 -- Add attributes of a package entity to the entity in a package
4439 procedure Decorate_Tagged_Type
4443 -- Set basic attributes of tagged type T, including its class_wide type.
4444 -- The parameters Loc, Scope are used to decorate the class_wide type.
4446 procedure Build_Chain
4448 First_Decl : Node_Id);
4449 -- Construct list of shadow entities and attach it to entity of
4450 -- package that is mentioned in a limited_with clause.
4452 function New_Internal_Shadow_Entity
4453 (Kind : Entity_Kind;
4454 Sloc_Value : Source_Ptr;
4455 Id_Char : Character) return Entity_Id;
4456 -- Build a new internal entity and append it to the list of shadow
4457 -- entities available through the limited-header
4459 ------------------------------
4460 -- Decorate_Incomplete_Type --
4461 ------------------------------
4463 procedure Decorate_Incomplete_Type
4468 Set_Ekind (E, E_Incomplete_Type);
4469 Set_Scope (E, Scop);
4471 Set_Is_First_Subtype (E, True);
4472 Set_Stored_Constraint (E, No_Elist);
4473 Set_Full_View (E, Empty);
4474 Init_Size_Align (E);
4475 end Decorate_Incomplete_Type;
4477 --------------------------
4478 -- Decorate_Tagged_Type --
4479 --------------------------
4481 procedure Decorate_Tagged_Type
4489 Decorate_Incomplete_Type (T, Scop);
4490 Set_Is_Tagged_Type (T);
4492 -- Build corresponding class_wide type, if not previously done
4494 -- Warning: The class-wide entity is shared by the limited-view
4495 -- and the full-view.
4497 if No (Class_Wide_Type (T)) then
4498 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S'));
4500 Set_Ekind (CW, E_Class_Wide_Type);
4502 Set_Scope (CW, Scop);
4503 Set_Is_Tagged_Type (CW);
4504 Set_Is_First_Subtype (CW, True);
4505 Init_Size_Align (CW);
4506 Set_Has_Unknown_Discriminants (CW, True);
4507 Set_Class_Wide_Type (CW, CW);
4508 Set_Equivalent_Type (CW, Empty);
4509 Set_From_With_Type (CW, From_With_Type (T));
4511 Set_Class_Wide_Type (T, CW);
4513 end Decorate_Tagged_Type;
4515 ------------------------------------
4516 -- Decorate_Package_Specification --
4517 ------------------------------------
4519 procedure Decorate_Package_Specification (P : Entity_Id) is
4521 -- Place only the most basic attributes
4523 Set_Ekind (P, E_Package);
4524 Set_Etype (P, Standard_Void_Type);
4525 end Decorate_Package_Specification;
4527 --------------------------------
4528 -- New_Internal_Shadow_Entity --
4529 --------------------------------
4531 function New_Internal_Shadow_Entity
4532 (Kind : Entity_Kind;
4533 Sloc_Value : Source_Ptr;
4534 Id_Char : Character) return Entity_Id
4536 E : constant Entity_Id :=
4537 Make_Defining_Identifier (Sloc_Value,
4538 Chars => New_Internal_Name (Id_Char));
4541 Set_Ekind (E, Kind);
4542 Set_Is_Internal (E, True);
4544 if Kind in Type_Kind then
4545 Init_Size_Align (E);
4548 Append_Entity (E, Lim_Header);
4551 end New_Internal_Shadow_Entity;
4557 procedure Build_Chain
4559 First_Decl : Node_Id)
4561 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
4562 Is_Tagged : Boolean;
4567 while Present (Decl) loop
4569 -- For each library_package_declaration in the environment, there
4570 -- is an implicit declaration of a *limited view* of that library
4571 -- package. The limited view of a package contains:
4573 -- * For each nested package_declaration, a declaration of the
4574 -- limited view of that package, with the same defining-
4575 -- program-unit name.
4577 -- * For each type_declaration in the visible part, an incomplete
4578 -- type-declaration with the same defining_identifier, whose
4579 -- completion is the type_declaration. If the type_declaration
4580 -- is tagged, then the incomplete_type_declaration is tagged
4582 -- The partial view is tagged if the declaration has the
4583 -- explicit keyword, or else if it is a type extension, both
4584 -- of which can be ascertained syntactically.
4586 if Nkind (Decl) = N_Full_Type_Declaration then
4588 (Nkind (Type_Definition (Decl)) = N_Record_Definition
4589 and then Tagged_Present (Type_Definition (Decl)))
4591 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
4594 (Record_Extension_Part (Type_Definition (Decl))));
4596 Comp_Typ := Defining_Identifier (Decl);
4598 if not Analyzed_Unit then
4600 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4602 Decorate_Incomplete_Type (Comp_Typ, Scope);
4606 -- Create shadow entity for type
4608 Lim_Typ := New_Internal_Shadow_Entity
4609 (Kind => Ekind (Comp_Typ),
4610 Sloc_Value => Sloc (Comp_Typ),
4613 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4614 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4615 Set_From_With_Type (Lim_Typ);
4618 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4620 Decorate_Incomplete_Type (Lim_Typ, Scope);
4623 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4625 elsif Nkind (Decl) = N_Private_Type_Declaration then
4626 Comp_Typ := Defining_Identifier (Decl);
4628 if not Analyzed_Unit then
4629 if Tagged_Present (Decl) then
4630 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4632 Decorate_Incomplete_Type (Comp_Typ, Scope);
4636 Lim_Typ := New_Internal_Shadow_Entity
4637 (Kind => Ekind (Comp_Typ),
4638 Sloc_Value => Sloc (Comp_Typ),
4641 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4642 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4643 Set_From_With_Type (Lim_Typ);
4645 if Tagged_Present (Decl) then
4646 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4648 Decorate_Incomplete_Type (Lim_Typ, Scope);
4651 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4653 elsif Nkind (Decl) = N_Private_Extension_Declaration then
4654 Comp_Typ := Defining_Identifier (Decl);
4656 if not Analyzed_Unit then
4657 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4660 -- Create shadow entity for type
4662 Lim_Typ := New_Internal_Shadow_Entity
4663 (Kind => Ekind (Comp_Typ),
4664 Sloc_Value => Sloc (Comp_Typ),
4667 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4668 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4669 Set_From_With_Type (Lim_Typ);
4671 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4672 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4674 elsif Nkind (Decl) = N_Package_Declaration then
4679 Spec : constant Node_Id := Specification (Decl);
4682 Comp_Typ := Defining_Unit_Name (Spec);
4684 if not Analyzed (Cunit (Unum)) then
4685 Decorate_Package_Specification (Comp_Typ);
4686 Set_Scope (Comp_Typ, Scope);
4689 Lim_Typ := New_Internal_Shadow_Entity
4690 (Kind => Ekind (Comp_Typ),
4691 Sloc_Value => Sloc (Comp_Typ),
4694 Decorate_Package_Specification (Lim_Typ);
4695 Set_Scope (Lim_Typ, Scope);
4697 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4698 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4699 Set_From_With_Type (Lim_Typ);
4701 -- Note: The non_limited_view attribute is not used
4702 -- for local packages.
4706 First_Decl => First (Visible_Declarations (Spec)));
4714 -- Start of processing for Build_Limited_Views
4717 pragma Assert (Limited_Present (N));
4719 -- A library_item mentioned in a limited_with_clause shall be
4720 -- a package_declaration, not a subprogram_declaration,
4721 -- generic_declaration, generic_instantiation, or
4722 -- package_renaming_declaration
4724 case Nkind (Unit (Library_Unit (N))) is
4726 when N_Package_Declaration =>
4729 when N_Subprogram_Declaration =>
4730 Error_Msg_N ("subprograms not allowed in "
4731 & "limited with_clauses", N);
4734 when N_Generic_Package_Declaration |
4735 N_Generic_Subprogram_Declaration =>
4736 Error_Msg_N ("generics not allowed in "
4737 & "limited with_clauses", N);
4740 when N_Generic_Instantiation =>
4741 Error_Msg_N ("generic instantiations not allowed in "
4742 & "limited with_clauses", N);
4745 when N_Generic_Renaming_Declaration =>
4746 Error_Msg_N ("generic renamings not allowed in "
4747 & "limited with_clauses", N);
4750 when N_Subprogram_Renaming_Declaration =>
4751 Error_Msg_N ("renamed subprograms not allowed in "
4752 & "limited with_clauses", N);
4755 when N_Package_Renaming_Declaration =>
4756 Error_Msg_N ("renamed packages not allowed in "
4757 & "limited with_clauses", N);
4761 raise Program_Error;
4764 -- Check if the chain is already built
4766 Spec := Specification (Unit (Library_Unit (N)));
4768 if Limited_View_Installed (Spec) then
4772 Set_Ekind (P, E_Package);
4774 -- Build the header of the limited_view
4776 Lim_Header := Make_Defining_Identifier (Sloc (N),
4777 Chars => New_Internal_Name (Id_Char => 'Z'));
4778 Set_Ekind (Lim_Header, E_Package);
4779 Set_Is_Internal (Lim_Header);
4780 Set_Limited_View (P, Lim_Header);
4782 -- Create the auxiliary chain. All the shadow entities are appended
4783 -- to the list of entities of the limited-view header
4787 First_Decl => First (Visible_Declarations (Spec)));
4789 -- Save the last built shadow entity. It is needed later to set the
4790 -- reference to the first shadow entity in the private part
4792 Last_Pub_Lim_E := Last_Lim_E;
4794 -- Ada 2005 (AI-262): Add the limited view of the private declarations
4795 -- Required to give support to limited-private-with clauses
4797 Build_Chain (Scope => P,
4798 First_Decl => First (Private_Declarations (Spec)));
4800 if Last_Pub_Lim_E /= Empty then
4801 Set_First_Private_Entity (Lim_Header,
4802 Next_Entity (Last_Pub_Lim_E));
4804 Set_First_Private_Entity (Lim_Header,
4808 Set_Limited_View_Installed (Spec);
4809 end Build_Limited_Views;
4811 -------------------------------
4812 -- Check_Body_Needed_For_SAL --
4813 -------------------------------
4815 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
4817 function Entity_Needs_Body (E : Entity_Id) return Boolean;
4818 -- Determine whether use of entity E might require the presence
4819 -- of its body. For a package this requires a recursive traversal
4820 -- of all nested declarations.
4822 ---------------------------
4823 -- Entity_Needed_For_SAL --
4824 ---------------------------
4826 function Entity_Needs_Body (E : Entity_Id) return Boolean is
4830 if Is_Subprogram (E)
4831 and then Has_Pragma_Inline (E)
4835 elsif Ekind (E) = E_Generic_Function
4836 or else Ekind (E) = E_Generic_Procedure
4840 elsif Ekind (E) = E_Generic_Package
4842 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
4843 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
4847 elsif Ekind (E) = E_Package
4849 Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
4850 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
4852 Ent := First_Entity (E);
4853 while Present (Ent) loop
4854 if Entity_Needs_Body (Ent) then
4866 end Entity_Needs_Body;
4868 -- Start of processing for Check_Body_Needed_For_SAL
4871 if Ekind (Unit_Name) = E_Generic_Package
4873 Nkind (Unit_Declaration_Node (Unit_Name)) =
4874 N_Generic_Package_Declaration
4876 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
4878 Set_Body_Needed_For_SAL (Unit_Name);
4880 elsif Ekind (Unit_Name) = E_Generic_Procedure
4881 or else Ekind (Unit_Name) = E_Generic_Function
4883 Set_Body_Needed_For_SAL (Unit_Name);
4885 elsif Is_Subprogram (Unit_Name)
4886 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
4887 N_Subprogram_Declaration
4888 and then Has_Pragma_Inline (Unit_Name)
4890 Set_Body_Needed_For_SAL (Unit_Name);
4892 elsif Ekind (Unit_Name) = E_Subprogram_Body then
4893 Check_Body_Needed_For_SAL
4894 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
4896 elsif Ekind (Unit_Name) = E_Package
4897 and then Entity_Needs_Body (Unit_Name)
4899 Set_Body_Needed_For_SAL (Unit_Name);
4901 elsif Ekind (Unit_Name) = E_Package_Body
4902 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
4904 Check_Body_Needed_For_SAL
4905 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
4907 end Check_Body_Needed_For_SAL;
4909 --------------------
4910 -- Remove_Context --
4911 --------------------
4913 procedure Remove_Context (N : Node_Id) is
4914 Lib_Unit : constant Node_Id := Unit (N);
4917 -- If this is a child unit, first remove the parent units
4919 if Is_Child_Spec (Lib_Unit) then
4920 Remove_Parents (Lib_Unit);
4923 Remove_Context_Clauses (N);
4926 ----------------------------
4927 -- Remove_Context_Clauses --
4928 ----------------------------
4930 procedure Remove_Context_Clauses (N : Node_Id) is
4932 Unit_Name : Entity_Id;
4935 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
4936 -- limited-views first and regular-views later (to maintain the
4939 -- First Phase: Remove limited_with context clauses
4941 Item := First (Context_Items (N));
4942 while Present (Item) loop
4944 -- We are interested only in with clauses which got installed
4947 if Nkind (Item) = N_With_Clause
4948 and then Limited_Present (Item)
4949 and then Limited_View_Installed (Item)
4951 Remove_Limited_With_Clause (Item);
4957 -- Second Phase: Loop through context items and undo regular
4958 -- with_clauses and use_clauses.
4960 Item := First (Context_Items (N));
4961 while Present (Item) loop
4963 -- We are interested only in with clauses which got installed
4964 -- on entry, as indicated by their Context_Installed flag set
4966 if Nkind (Item) = N_With_Clause
4967 and then Limited_Present (Item)
4968 and then Limited_View_Installed (Item)
4972 elsif Nkind (Item) = N_With_Clause
4973 and then Context_Installed (Item)
4975 -- Remove items from one with'ed unit
4977 Unit_Name := Entity (Name (Item));
4978 Remove_Unit_From_Visibility (Unit_Name);
4979 Set_Context_Installed (Item, False);
4981 elsif Nkind (Item) = N_Use_Package_Clause then
4982 End_Use_Package (Item);
4984 elsif Nkind (Item) = N_Use_Type_Clause then
4985 End_Use_Type (Item);
4990 end Remove_Context_Clauses;
4992 --------------------------------
4993 -- Remove_Limited_With_Clause --
4994 --------------------------------
4996 procedure Remove_Limited_With_Clause (N : Node_Id) is
4997 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5000 Lim_Header : Entity_Id;
5001 Lim_Typ : Entity_Id;
5005 pragma Assert (Limited_View_Installed (N));
5007 -- In case of limited with_clause on subprograms, generics, instances,
5008 -- or renamings, the corresponding error was previously posted and we
5009 -- have nothing to do here.
5011 if Nkind (P_Unit) /= N_Package_Declaration then
5015 P := Defining_Unit_Name (Specification (P_Unit));
5017 -- Handle child packages
5019 if Nkind (P) = N_Defining_Program_Unit_Name then
5020 P := Defining_Identifier (P);
5023 if Debug_Flag_I then
5024 Write_Str ("remove limited view of ");
5025 Write_Name (Chars (P));
5026 Write_Str (" from visibility");
5030 -- Prepare the removal of the shadow entities from visibility. The
5031 -- first element of the limited view is a header (an E_Package
5032 -- entity) that is used to reference the first shadow entity in the
5033 -- private part of the package
5035 Lim_Header := Limited_View (P);
5036 Lim_Typ := First_Entity (Lim_Header);
5038 -- Remove package and shadow entities from visibility if it has not
5041 if not Analyzed (P_Unit) then
5043 Set_Is_Immediately_Visible (P, False);
5045 while Present (Lim_Typ) loop
5047 Next_Entity (Lim_Typ);
5050 -- Otherwise this package has already appeared in the closure and its
5051 -- shadow entities must be replaced by its real entities. This code
5052 -- must be kept synchronized with the complementary code in Install
5053 -- Limited_Withed_Unit.
5056 -- Real entities that are type or subtype declarations were hidden
5057 -- from visibility at the point of installation of the limited-view.
5058 -- Now we recover the previous value of the hidden attribute.
5060 E := First_Entity (P);
5061 while Present (E) and then E /= First_Private_Entity (P) loop
5063 Set_Is_Hidden (E, Was_Hidden (E));
5069 while Present (Lim_Typ)
5070 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5072 -- Nested packages and child units were not unchained
5074 if Ekind (Lim_Typ) /= E_Package
5075 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5077 -- Handle incomplete types of the real view. For this purpose
5078 -- we traverse the list of visible entities to look for an
5079 -- incomplete type in the real-view associated with Lim_Typ.
5081 E := First_Entity (P);
5082 while Present (E) and then E /= First_Private_Entity (P) loop
5083 exit when Ekind (E) = E_Incomplete_Type
5084 and then Present (Full_View (E))
5085 and then Full_View (E) = Lim_Typ;
5090 -- If the previous search was not sucessful then the entity
5091 -- to be restored in the homonym list is the non-limited view
5093 if E = First_Private_Entity (P) then
5094 E := Non_Limited_View (Lim_Typ);
5097 pragma Assert (not In_Chain (E));
5099 Prev := Current_Entity (Lim_Typ);
5101 if Prev = Lim_Typ then
5102 Set_Current_Entity (E);
5105 while Present (Prev)
5106 and then Homonym (Prev) /= Lim_Typ
5108 Prev := Homonym (Prev);
5110 pragma Assert (Present (Prev));
5112 Set_Homonym (Prev, E);
5115 -- We must also set the next homonym entity of the real entity
5116 -- to handle the case in which the next homonym was a shadow
5119 Set_Homonym (E, Homonym (Lim_Typ));
5122 Next_Entity (Lim_Typ);
5126 -- Indicate that the limited view of the package is not installed
5128 Set_From_With_Type (P, False);
5129 Set_Limited_View_Installed (N, False);
5130 end Remove_Limited_With_Clause;
5132 --------------------
5133 -- Remove_Parents --
5134 --------------------
5136 procedure Remove_Parents (Lib_Unit : Node_Id) is
5139 P_Spec : Node_Id := Empty;
5141 Vis : constant Boolean :=
5142 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
5145 if Is_Child_Spec (Lib_Unit) then
5146 P_Spec := Parent_Spec (Lib_Unit);
5148 elsif Nkind (Lib_Unit) = N_Package_Body
5149 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
5151 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
5154 if Present (P_Spec) then
5157 P_Name := Get_Parent_Entity (P);
5158 Remove_Context_Clauses (P_Spec);
5159 End_Package_Scope (P_Name);
5160 Set_Is_Immediately_Visible (P_Name, Vis);
5162 -- Remove from visibility the siblings as well, which are directly
5163 -- visible while the parent is in scope.
5165 E := First_Entity (P_Name);
5166 while Present (E) loop
5167 if Is_Child_Unit (E) then
5168 Set_Is_Immediately_Visible (E, False);
5174 Set_In_Package_Body (P_Name, False);
5176 -- This is the recursive call to remove the context of any
5177 -- higher level parent. This recursion ensures that all parents
5178 -- are removed in the reverse order of their installation.
5184 ---------------------------------
5185 -- Remove_Private_With_Clauses --
5186 ---------------------------------
5188 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
5192 Item := First (Context_Items (Comp_Unit));
5193 while Present (Item) loop
5194 if Nkind (Item) = N_With_Clause
5195 and then Private_Present (Item)
5197 if Limited_Present (Item) then
5198 if not Limited_View_Installed (Item) then
5199 Remove_Limited_With_Clause (Item);
5202 Remove_Unit_From_Visibility (Entity (Name (Item)));
5203 Set_Context_Installed (Item, False);
5209 end Remove_Private_With_Clauses;
5211 ---------------------------------
5212 -- Remove_Unit_From_Visibility --
5213 ---------------------------------
5215 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
5216 P : constant Entity_Id := Scope (Unit_Name);
5220 if Debug_Flag_I then
5221 Write_Str ("remove unit ");
5222 Write_Name (Chars (Unit_Name));
5223 Write_Str (" from visibility");
5227 if P /= Standard_Standard then
5228 Set_Is_Visible_Child_Unit (Unit_Name, False);
5231 Set_Is_Potentially_Use_Visible (Unit_Name, False);
5232 Set_Is_Immediately_Visible (Unit_Name, False);
5233 end Remove_Unit_From_Visibility;
5248 procedure Unchain (E : Entity_Id) is
5252 Prev := Current_Entity (E);
5258 Set_Name_Entity_Id (Chars (E), Homonym (E));
5261 while Present (Prev)
5262 and then Homonym (Prev) /= E
5264 Prev := Homonym (Prev);
5267 if Present (Prev) then
5268 Set_Homonym (Prev, Homonym (E));
5272 if Debug_Flag_I then
5273 Write_Str (" (homonym) unchain ");
5274 Write_Name (Chars (E));
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