1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Debug; use Debug;
28 with Einfo; use Einfo;
29 with Errout; use Errout;
30 with Exp_Util; use Exp_Util;
31 with Elists; use Elists;
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 Par_SCO; use Par_SCO;
46 with Restrict; use Restrict;
47 with Rident; use Rident;
48 with Rtsfind; use Rtsfind;
50 with Sem_Ch3; use Sem_Ch3;
51 with Sem_Ch6; use Sem_Ch6;
52 with Sem_Ch7; use Sem_Ch7;
53 with Sem_Ch8; use Sem_Ch8;
54 with Sem_Dist; use Sem_Dist;
55 with Sem_Prag; use Sem_Prag;
56 with Sem_Util; use Sem_Util;
57 with Sem_Warn; use Sem_Warn;
58 with Stand; use Stand;
59 with Sinfo; use Sinfo;
60 with Sinfo.CN; use Sinfo.CN;
61 with Sinput; use Sinput;
62 with Snames; use Snames;
63 with Style; use Style;
64 with Stylesw; use Stylesw;
65 with Tbuild; use Tbuild;
66 with Uname; use Uname;
68 package body Sem_Ch10 is
70 -----------------------
71 -- Local Subprograms --
72 -----------------------
74 procedure Analyze_Context (N : Node_Id);
75 -- Analyzes items in the context clause of compilation unit
77 procedure Build_Limited_Views (N : Node_Id);
78 -- Build and decorate the list of shadow entities for a package mentioned
79 -- in a limited_with clause. If the package was not previously analyzed
80 -- then it also performs a basic decoration of the real entities. This is
81 -- required to do not pass non-decorated entities to the back-end.
82 -- Implements Ada 2005 (AI-50217).
84 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id);
85 -- Check whether the source for the body of a compilation unit must be
86 -- included in a standalone library.
88 procedure Check_Private_Child_Unit (N : Node_Id);
89 -- If a with_clause mentions a private child unit, the compilation
90 -- unit must be a member of the same family, as described in 10.1.2.
92 procedure Check_Stub_Level (N : Node_Id);
93 -- Verify that a stub is declared immediately within a compilation unit,
94 -- and not in an inner frame.
96 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id);
97 -- When a child unit appears in a context clause, the implicit withs on
98 -- parents are made explicit, and with clauses are inserted in the context
99 -- clause before the one for the child. If a parent in the with_clause
100 -- is a renaming, the implicit with_clause is on the renaming whose name
101 -- is mentioned in the with_clause, and not on the package it renames.
102 -- N is the compilation unit whose list of context items receives the
103 -- implicit with_clauses.
105 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
106 -- Get defining entity of parent unit of a child unit. In most cases this
107 -- is the defining entity of the unit, but for a child instance whose
108 -- parent needs a body for inlining, the instantiation node of the parent
109 -- has not yet been rewritten as a package declaration, and the entity has
110 -- to be retrieved from the Instance_Spec of the unit.
112 function Has_With_Clause
115 Is_Limited : Boolean := False) return Boolean;
116 -- Determine whether compilation unit C_Unit contains a [limited] with
117 -- clause for package Pack. Use the flag Is_Limited to designate desired
120 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id);
121 -- If the main unit is a child unit, implicit withs are also added for
122 -- all its ancestors.
124 function In_Chain (E : Entity_Id) return Boolean;
125 -- Check that the shadow entity is not already in the homonym chain, for
126 -- example through a limited_with clause in a parent unit.
128 procedure Install_Context_Clauses (N : Node_Id);
129 -- Subsidiary to Install_Context and Install_Parents. Process only with_
130 -- and use_clauses for current unit and its library unit if any.
132 procedure Install_Limited_Context_Clauses (N : Node_Id);
133 -- Subsidiary to Install_Context. Process only limited with_clauses for
134 -- current unit. Implements Ada 2005 (AI-50217).
136 procedure Install_Limited_Withed_Unit (N : Node_Id);
137 -- Place shadow entities for a limited_with package in the visibility
138 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
140 procedure Install_Withed_Unit
141 (With_Clause : Node_Id;
142 Private_With_OK : Boolean := False);
143 -- If the unit is not a child unit, make unit immediately visible. The
144 -- caller ensures that the unit is not already currently installed. The
145 -- flag Private_With_OK is set true in Install_Private_With_Clauses, which
146 -- is called when compiling the private part of a package, or installing
147 -- the private declarations of a parent unit.
149 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean);
150 -- This procedure establishes the context for the compilation of a child
151 -- unit. If Lib_Unit is a child library spec then the context of the parent
152 -- is installed, and the parent itself made immediately visible, so that
153 -- the child unit is processed in the declarative region of the parent.
154 -- Install_Parents makes a recursive call to itself to ensure that all
155 -- parents are loaded in the nested case. If Lib_Unit is a library body,
156 -- the only effect of Install_Parents is to install the private decls of
157 -- the parents, because the visible parent declarations will have been
158 -- installed as part of the context of the corresponding spec.
160 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id);
161 -- In the compilation of a child unit, a child of any of the ancestor
162 -- units is directly visible if it is visible, because the parent is in
163 -- an enclosing scope. Iterate over context to find child units of U_Name
164 -- or of some ancestor of it.
166 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean;
167 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
168 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
169 -- a library spec that has a parent. If the call to Is_Child_Spec returns
170 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
171 -- compilation unit for the parent spec.
173 -- Lib_Unit can also be a subprogram body that acts as its own spec. If the
174 -- Parent_Spec is non-empty, this is also a child unit.
176 procedure Remove_Context_Clauses (N : Node_Id);
177 -- Subsidiary of previous one. Remove use_ and with_clauses
179 procedure Remove_Limited_With_Clause (N : Node_Id);
180 -- Remove from visibility the shadow entities introduced for a package
181 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
183 procedure Remove_Parents (Lib_Unit : Node_Id);
184 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
185 -- contexts established by the corresponding call to Install_Parents are
186 -- removed. Remove_Parents contains a recursive call to itself to ensure
187 -- that all parents are removed in the nested case.
189 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
190 -- Reset all visibility flags on unit after compiling it, either as a
191 -- main unit or as a unit in the context.
193 procedure Unchain (E : Entity_Id);
194 -- Remove single entity from visibility list
196 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
197 -- Common processing for all stubs (subprograms, tasks, packages, and
198 -- protected cases). N is the stub to be analyzed. Once the subunit
199 -- name is established, load and analyze. Nam is the non-overloadable
200 -- entity for which the proper body provides a completion. Subprogram
201 -- stubs are handled differently because they can be declarations.
204 -- A dummy procedure, for debugging use, called just before analyzing the
205 -- main unit (after dealing with any context clauses).
207 --------------------------
208 -- Limited_With_Clauses --
209 --------------------------
211 -- Limited_With clauses are the mechanism chosen for Ada05 to support
212 -- mutually recursive types declared in different units. A limited_with
213 -- clause that names package P in the context of unit U makes the types
214 -- declared in the visible part of P available within U, but with the
215 -- restriction that these types can only be used as incomplete types.
216 -- The limited_with clause does not impose a semantic dependence on P,
217 -- and it is possible for two packages to have limited_with_clauses on
218 -- each other without creating an elaboration circularity.
220 -- To support this feature, the analysis of a limited_with clause must
221 -- create an abbreviated view of the package, without performing any
222 -- semantic analysis on it. This "package abstract" contains shadow
223 -- types that are in one-one correspondence with the real types in the
224 -- package, and that have the properties of incomplete types.
226 -- The implementation creates two element lists: one to chain the shadow
227 -- entities, and one to chain the corresponding type entities in the tree
228 -- of the package. Links between corresponding entities in both chains
229 -- allow the compiler to select the proper view of a given type, depending
230 -- on the context. Note that in contrast with the handling of private
231 -- types, the limited view and the non-limited view of a type are treated
232 -- as separate entities, and no entity exchange needs to take place, which
233 -- makes the implementation must simpler than could be feared.
235 ------------------------------
236 -- Analyze_Compilation_Unit --
237 ------------------------------
239 procedure Analyze_Compilation_Unit (N : Node_Id) is
240 Unit_Node : constant Node_Id := Unit (N);
241 Lib_Unit : Node_Id := Library_Unit (N);
243 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
244 Par_Spec_Name : Unit_Name_Type;
245 Unum : Unit_Number_Type;
247 procedure Check_Redundant_Withs
248 (Context_Items : List_Id;
249 Spec_Context_Items : List_Id := No_List);
250 -- Determine whether the context list of a compilation unit contains
251 -- redundant with clauses. When checking body clauses against spec
252 -- clauses, set Context_Items to the context list of the body and
253 -- Spec_Context_Items to that of the spec. Parent packages are not
254 -- examined for documentation purposes.
256 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
257 -- Generate cross-reference information for the parents of child units.
258 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
260 ---------------------------
261 -- Check_Redundant_Withs --
262 ---------------------------
264 procedure Check_Redundant_Withs
265 (Context_Items : List_Id;
266 Spec_Context_Items : List_Id := No_List)
270 procedure Process_Body_Clauses
271 (Context_List : List_Id;
273 Used : in out Boolean;
274 Used_Type_Or_Elab : in out Boolean);
275 -- Examine the context clauses of a package body, trying to match
276 -- the name entity of Clause with any list element. If the match
277 -- occurs on a use package clause, set Used to True, for a use
278 -- type clause, pragma Elaborate or pragma Elaborate_All, set
279 -- Used_Type_Or_Elab to True.
281 procedure Process_Spec_Clauses
282 (Context_List : List_Id;
284 Used : in out Boolean;
285 Withed : in out Boolean;
286 Exit_On_Self : Boolean := False);
287 -- Examine the context clauses of a package spec, trying to match
288 -- the name entity of Clause with any list element. If the match
289 -- occurs on a use package clause, set Used to True, for a with
290 -- package clause other than Clause, set Withed to True. Limited
291 -- with clauses, implicitly generated with clauses and withs
292 -- having pragmas Elaborate or Elaborate_All applied to them are
293 -- skipped. Exit_On_Self is used to control the search loop and
294 -- force an exit whenever Clause sees itself in the search.
296 --------------------------
297 -- Process_Body_Clauses --
298 --------------------------
300 procedure Process_Body_Clauses
301 (Context_List : List_Id;
303 Used : in out Boolean;
304 Used_Type_Or_Elab : in out Boolean)
306 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
312 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean;
313 -- In an expanded name in a use clause, if the prefix is a
314 -- renamed package, the entity is set to the original package
315 -- as a result, when checking whether the package appears in a
316 -- previous with_clause, the renaming has to be taken into
317 -- account, to prevent spurious or incorrect warnings. The
318 -- common case is the use of Text_IO.
324 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean is
326 return Entity (N) = P
328 (Present (Renamed_Object (P))
329 and then Entity (N) = Renamed_Object (P));
332 -- Start of processing for Process_Body_Clauses
336 Used_Type_Or_Elab := False;
338 Cont_Item := First (Context_List);
339 while Present (Cont_Item) loop
341 -- Package use clause
343 if Nkind (Cont_Item) = N_Use_Package_Clause
346 -- Search through use clauses
348 Use_Item := First (Names (Cont_Item));
349 while Present (Use_Item) and then not Used loop
351 -- Case of a direct use of the one we are looking for
353 if Entity (Use_Item) = Nam_Ent then
356 -- Handle nested case, as in "with P; use P.Q.R"
363 -- Loop through prefixes looking for match
366 while Nkind (UE) = N_Expanded_Name loop
367 if Same_Unit (Prefix (UE), Nam_Ent) then
382 elsif Nkind (Cont_Item) = N_Use_Type_Clause
383 and then not Used_Type_Or_Elab
385 Subt_Mark := First (Subtype_Marks (Cont_Item));
386 while Present (Subt_Mark)
387 and then not Used_Type_Or_Elab
389 if Same_Unit (Prefix (Subt_Mark), Nam_Ent) then
390 Used_Type_Or_Elab := True;
396 -- Pragma Elaborate or Elaborate_All
398 elsif Nkind (Cont_Item) = N_Pragma
400 (Pragma_Name (Cont_Item) = Name_Elaborate
402 Pragma_Name (Cont_Item) = Name_Elaborate_All)
403 and then not Used_Type_Or_Elab
406 First (Pragma_Argument_Associations (Cont_Item));
407 while Present (Prag_Unit)
408 and then not Used_Type_Or_Elab
410 if Entity (Expression (Prag_Unit)) = Nam_Ent then
411 Used_Type_Or_Elab := True;
420 end Process_Body_Clauses;
422 --------------------------
423 -- Process_Spec_Clauses --
424 --------------------------
426 procedure Process_Spec_Clauses
427 (Context_List : List_Id;
429 Used : in out Boolean;
430 Withed : in out Boolean;
431 Exit_On_Self : Boolean := False)
433 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
441 Cont_Item := First (Context_List);
442 while Present (Cont_Item) loop
444 -- Stop the search since the context items after Cont_Item
445 -- have already been examined in a previous iteration of
446 -- the reverse loop in Check_Redundant_Withs.
449 and Cont_Item = Clause
454 -- Package use clause
456 if Nkind (Cont_Item) = N_Use_Package_Clause
459 Use_Item := First (Names (Cont_Item));
460 while Present (Use_Item) and then not Used loop
461 if Entity (Use_Item) = Nam_Ent then
468 -- Package with clause. Avoid processing self, implicitly
469 -- generated with clauses or limited with clauses. Note
470 -- that we examine with clauses having pragmas Elaborate
471 -- or Elaborate_All applied to them due to cases such as:
475 -- pragma Elaborate (Pack);
477 -- In this case, the second with clause is redundant since
478 -- the pragma applies only to the first "with Pack;".
480 elsif Nkind (Cont_Item) = N_With_Clause
481 and then not Implicit_With (Cont_Item)
482 and then not Limited_Present (Cont_Item)
483 and then Cont_Item /= Clause
484 and then Entity (Name (Cont_Item)) = Nam_Ent
491 end Process_Spec_Clauses;
493 -- Start of processing for Check_Redundant_Withs
496 Clause := Last (Context_Items);
497 while Present (Clause) loop
499 -- Avoid checking implicitly generated with clauses, limited
500 -- with clauses or withs that have pragma Elaborate or
501 -- Elaborate_All applied.
503 if Nkind (Clause) = N_With_Clause
504 and then not Implicit_With (Clause)
505 and then not Limited_Present (Clause)
506 and then not Elaborate_Present (Clause)
508 -- Package body-to-spec check
510 if Present (Spec_Context_Items) then
512 Used_In_Body : Boolean := False;
513 Used_In_Spec : Boolean := False;
514 Used_Type_Or_Elab : Boolean := False;
515 Withed_In_Spec : Boolean := False;
519 (Context_List => Spec_Context_Items,
521 Used => Used_In_Spec,
522 Withed => Withed_In_Spec);
525 (Context_List => Context_Items,
527 Used => Used_In_Body,
528 Used_Type_Or_Elab => Used_Type_Or_Elab);
530 -- "Type Elab" refers to the presence of either a use
531 -- type clause, pragmas Elaborate or Elaborate_All.
533 -- +---------------+---------------------------+------+
534 -- | Spec | Body | Warn |
535 -- +--------+------+--------+------+-----------+------+
536 -- | Withed | Used | Withed | Used | Type Elab | |
537 -- | X | | X | | | X |
538 -- | X | | X | X | | |
539 -- | X | | X | | X | |
540 -- | X | | X | X | X | |
541 -- | X | X | X | | | X |
542 -- | X | X | X | | X | |
543 -- | X | X | X | X | | X |
544 -- | X | X | X | X | X | |
545 -- +--------+------+--------+------+-----------+------+
548 and then not Used_Type_Or_Elab)
551 and then not Used_In_Body)
555 Error_Msg_N ("?redundant with clause in body", Clause);
558 Used_In_Body := False;
559 Used_In_Spec := False;
560 Used_Type_Or_Elab := False;
561 Withed_In_Spec := False;
564 -- Standalone package spec or body check
568 Dont_Care : Boolean := False;
569 Withed : Boolean := False;
572 -- The mechanism for examining the context clauses of a
573 -- package spec can be applied to package body clauses.
576 (Context_List => Context_Items,
580 Exit_On_Self => True);
583 Error_Msg_N ("?redundant with clause", Clause);
591 end Check_Redundant_Withs;
593 --------------------------------
594 -- Generate_Parent_References --
595 --------------------------------
597 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is
599 P_Name : Entity_Id := P_Id;
602 Pref := Name (Parent (Defining_Entity (N)));
604 if Nkind (Pref) = N_Expanded_Name then
606 -- Done already, if the unit has been compiled indirectly as
607 -- part of the closure of its context because of inlining.
612 while Nkind (Pref) = N_Selected_Component loop
613 Change_Selected_Component_To_Expanded_Name (Pref);
614 Set_Entity (Pref, P_Name);
615 Set_Etype (Pref, Etype (P_Name));
616 Generate_Reference (P_Name, Pref, 'r');
617 Pref := Prefix (Pref);
618 P_Name := Scope (P_Name);
621 -- The guard here on P_Name is to handle the error condition where
622 -- the parent unit is missing because the file was not found.
624 if Present (P_Name) then
625 Set_Entity (Pref, P_Name);
626 Set_Etype (Pref, Etype (P_Name));
627 Generate_Reference (P_Name, Pref, 'r');
628 Style.Check_Identifier (Pref, P_Name);
630 end Generate_Parent_References;
632 -- Start of processing for Analyze_Compilation_Unit
635 Process_Compilation_Unit_Pragmas (N);
637 -- If the unit is a subunit whose parent has not been analyzed (which
638 -- indicates that the main unit is a subunit, either the current one or
639 -- one of its descendents) then the subunit is compiled as part of the
640 -- analysis of the parent, which we proceed to do. Basically this gets
641 -- handled from the top down and we don't want to do anything at this
642 -- level (i.e. this subunit will be handled on the way down from the
643 -- parent), so at this level we immediately return. If the subunit
644 -- ends up not analyzed, it means that the parent did not contain a
645 -- stub for it, or that there errors were detected in some ancestor.
647 if Nkind (Unit_Node) = N_Subunit
648 and then not Analyzed (Lib_Unit)
650 Semantics (Lib_Unit);
652 if not Analyzed (Proper_Body (Unit_Node)) then
653 if Serious_Errors_Detected > 0 then
654 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N);
656 Error_Msg_N ("missing stub for subunit", N);
663 -- Analyze context (this will call Sem recursively for with'ed units)
664 -- To detect circularities among with-clauses that are not caught during
665 -- loading, we set the Context_Pending flag on the current unit. If the
666 -- flag is already set there is a potential circularity.
667 -- We exclude predefined units from this check because they are known
668 -- to be safe. We also exclude package bodies that are present because
669 -- circularities between bodies are harmless (and necessary).
671 if Context_Pending (N) then
673 Circularity : Boolean := True;
676 if Is_Predefined_File_Name
677 (Unit_File_Name (Get_Source_Unit (Unit (N))))
679 Circularity := False;
682 for U in Main_Unit + 1 .. Last_Unit loop
683 if Nkind (Unit (Cunit (U))) = N_Package_Body
684 and then not Analyzed (Cunit (U))
686 Circularity := False;
694 ("circular dependency caused by with_clauses", N);
696 ("\possibly missing limited_with clause"
697 & " in one of the following", N);
699 for U in Main_Unit .. Last_Unit loop
700 if Context_Pending (Cunit (U)) then
701 Error_Msg_Unit_1 := Get_Unit_Name (Unit (Cunit (U)));
702 Error_Msg_N ("\unit$", N);
706 raise Unrecoverable_Error;
710 Set_Context_Pending (N);
715 Set_Context_Pending (N, False);
717 -- If the unit is a package body, the spec is already loaded and must be
718 -- analyzed first, before we analyze the body.
720 if Nkind (Unit_Node) = N_Package_Body then
722 -- If no Lib_Unit, then there was a serious previous error, so just
723 -- ignore the entire analysis effort
725 if No (Lib_Unit) then
729 Semantics (Lib_Unit);
730 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
732 -- Verify that the library unit is a package declaration
734 if not Nkind_In (Unit (Lib_Unit), N_Package_Declaration,
735 N_Generic_Package_Declaration)
738 ("no legal package declaration for package body", N);
741 -- Otherwise, the entity in the declaration is visible. Update the
742 -- version to reflect dependence of this body on the spec.
745 Spec_Id := Defining_Entity (Unit (Lib_Unit));
746 Set_Is_Immediately_Visible (Spec_Id, True);
747 Version_Update (N, Lib_Unit);
749 if Nkind (Defining_Unit_Name (Unit_Node)) =
750 N_Defining_Program_Unit_Name
752 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
757 -- If the unit is a subprogram body, then we similarly need to analyze
758 -- its spec. However, things are a little simpler in this case, because
759 -- here, this analysis is done only for error checking and consistency
760 -- purposes, so there's nothing else to be done.
762 elsif Nkind (Unit_Node) = N_Subprogram_Body then
763 if Acts_As_Spec (N) then
765 -- If the subprogram body is a child unit, we must create a
766 -- declaration for it, in order to properly load the parent(s).
767 -- After this, the original unit does not acts as a spec, because
768 -- there is an explicit one. If this unit appears in a context
769 -- clause, then an implicit with on the parent will be added when
770 -- installing the context. If this is the main unit, there is no
771 -- Unit_Table entry for the declaration (it has the unit number
772 -- of the main unit) and code generation is unaffected.
774 Unum := Get_Cunit_Unit_Number (N);
775 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
777 if Par_Spec_Name /= No_Unit_Name then
780 (Load_Name => Par_Spec_Name,
785 if Unum /= No_Unit then
787 -- Build subprogram declaration and attach parent unit to it
788 -- This subprogram declaration does not come from source,
789 -- Nevertheless the backend must generate debugging info for
790 -- it, and this must be indicated explicitly. We also mark
791 -- the body entity as a child unit now, to prevent a
792 -- cascaded error if the spec entity cannot be entered
793 -- in its scope. Finally we create a Units table entry for
794 -- the subprogram declaration, to maintain a one-to-one
795 -- correspondence with compilation unit nodes. This is
796 -- critical for the tree traversals performed by CodePeer.
799 Loc : constant Source_Ptr := Sloc (N);
800 SCS : constant Boolean :=
801 Get_Comes_From_Source_Default;
804 Set_Comes_From_Source_Default (False);
806 Make_Compilation_Unit (Loc,
807 Context_Items => New_Copy_List (Context_Items (N)),
809 Make_Subprogram_Declaration (Sloc (N),
812 (Specification (Unit_Node))),
814 Make_Compilation_Unit_Aux (Loc));
816 Set_Library_Unit (N, Lib_Unit);
817 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
818 Make_Child_Decl_Unit (N);
819 Semantics (Lib_Unit);
821 -- Now that a separate declaration exists, the body
822 -- of the child unit does not act as spec any longer.
824 Set_Acts_As_Spec (N, False);
825 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
826 Set_Debug_Info_Needed (Defining_Entity (Unit (Lib_Unit)));
827 Set_Comes_From_Source_Default (SCS);
832 -- Here for subprogram with separate declaration
835 Semantics (Lib_Unit);
836 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
837 Version_Update (N, Lib_Unit);
840 -- If this is a child unit, generate references to the parents
842 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
843 N_Defining_Program_Unit_Name
845 Generate_Parent_References (
846 Specification (Unit_Node),
847 Scope (Defining_Entity (Unit (Lib_Unit))));
851 -- If it is a child unit, the parent must be elaborated first and we
852 -- update version, since we are dependent on our parent.
854 if Is_Child_Spec (Unit_Node) then
856 -- The analysis of the parent is done with style checks off
859 Save_Style_Check : constant Boolean := Style_Check;
860 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
861 Cunit_Boolean_Restrictions_Save;
864 if not GNAT_Mode then
865 Style_Check := False;
868 Semantics (Parent_Spec (Unit_Node));
869 Version_Update (N, Parent_Spec (Unit_Node));
870 Style_Check := Save_Style_Check;
871 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
875 -- With the analysis done, install the context. Note that we can't
876 -- install the context from the with clauses as we analyze them, because
877 -- each with clause must be analyzed in a clean visibility context, so
878 -- we have to wait and install them all at once.
882 if Is_Child_Spec (Unit_Node) then
884 -- Set the entities of all parents in the program_unit_name
886 Generate_Parent_References (
887 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
890 -- All components of the context: with-clauses, library unit, ancestors
891 -- if any, (and their context) are analyzed and installed.
893 -- Call special debug routine sm if this is the main unit
895 if Current_Sem_Unit = Main_Unit then
899 -- Now analyze the unit (package, subprogram spec, body) itself
903 if Warn_On_Redundant_Constructs then
904 Check_Redundant_Withs (Context_Items (N));
906 if Nkind (Unit_Node) = N_Package_Body then
907 Check_Redundant_Withs
908 (Context_Items => Context_Items (N),
909 Spec_Context_Items => Context_Items (Lib_Unit));
913 -- The above call might have made Unit_Node an N_Subprogram_Body from
914 -- something else, so propagate any Acts_As_Spec flag.
916 if Nkind (Unit_Node) = N_Subprogram_Body
917 and then Acts_As_Spec (Unit_Node)
919 Set_Acts_As_Spec (N);
922 -- Register predefined units in Rtsfind
925 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
927 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
928 Set_RTU_Loaded (Unit_Node);
932 -- Treat compilation unit pragmas that appear after the library unit
934 if Present (Pragmas_After (Aux_Decls_Node (N))) then
936 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
938 while Present (Prag_Node) loop
945 -- Generate distribution stubs if requested and no error
948 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
950 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
951 and then not Fatal_Error (Main_Unit)
953 if Is_RCI_Pkg_Spec_Or_Body (N) then
955 -- Regular RCI package
957 Add_Stub_Constructs (N);
959 elsif (Nkind (Unit_Node) = N_Package_Declaration
960 and then Is_Shared_Passive (Defining_Entity
961 (Specification (Unit_Node))))
962 or else (Nkind (Unit_Node) = N_Package_Body
964 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
966 -- Shared passive package
968 Add_Stub_Constructs (N);
970 elsif Nkind (Unit_Node) = N_Package_Instantiation
972 Is_Remote_Call_Interface
973 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
975 -- Instantiation of a RCI generic package
977 Add_Stub_Constructs (N);
981 -- Remove unit from visibility, so that environment is clean for
982 -- the next compilation, which is either the main unit or some
983 -- other unit in the context.
985 if Nkind_In (Unit_Node, N_Package_Declaration,
986 N_Package_Renaming_Declaration,
987 N_Subprogram_Declaration)
988 or else Nkind (Unit_Node) in N_Generic_Declaration
990 (Nkind (Unit_Node) = N_Subprogram_Body
991 and then Acts_As_Spec (Unit_Node))
993 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
995 -- If the unit is an instantiation whose body will be elaborated for
996 -- inlining purposes, use the proper entity of the instance. The
997 -- entity may be missing if the instantiation was illegal.
999 elsif Nkind (Unit_Node) = N_Package_Instantiation
1000 and then not Error_Posted (Unit_Node)
1001 and then Present (Instance_Spec (Unit_Node))
1003 Remove_Unit_From_Visibility
1004 (Defining_Entity (Instance_Spec (Unit_Node)));
1006 elsif Nkind (Unit_Node) = N_Package_Body
1007 or else (Nkind (Unit_Node) = N_Subprogram_Body
1008 and then not Acts_As_Spec (Unit_Node))
1010 -- Bodies that are not the main unit are compiled if they are generic
1011 -- or contain generic or inlined units. Their analysis brings in the
1012 -- context of the corresponding spec (unit declaration) which must be
1013 -- removed as well, to return the compilation environment to its
1016 Remove_Context (Lib_Unit);
1017 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
1020 -- Last step is to deinstall the context we just installed as well as
1021 -- the unit just compiled.
1025 -- If this is the main unit and we are generating code, we must check
1026 -- that all generic units in the context have a body if they need it,
1027 -- even if they have not been instantiated. In the absence of .ali files
1028 -- for generic units, we must force the load of the body, just to
1029 -- produce the proper error if the body is absent. We skip this
1030 -- verification if the main unit itself is generic.
1032 if Get_Cunit_Unit_Number (N) = Main_Unit
1033 and then Operating_Mode = Generate_Code
1034 and then Expander_Active
1036 -- Check whether the source for the body of the unit must be included
1037 -- in a standalone library.
1039 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
1041 -- Indicate that the main unit is now analyzed, to catch possible
1042 -- circularities between it and generic bodies. Remove main unit from
1043 -- visibility. This might seem superfluous, but the main unit must
1044 -- not be visible in the generic body expansions that follow.
1046 Set_Analyzed (N, True);
1047 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
1052 Un : Unit_Number_Type;
1054 Save_Style_Check : constant Boolean := Style_Check;
1055 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
1056 Cunit_Boolean_Restrictions_Save;
1059 Item := First (Context_Items (N));
1060 while Present (Item) loop
1062 -- Check for explicit with clause
1064 if Nkind (Item) = N_With_Clause
1065 and then not Implicit_With (Item)
1067 -- Ada 2005 (AI-50217): Ignore limited-withed units
1069 and then not Limited_Present (Item)
1071 Nam := Entity (Name (Item));
1073 -- Compile generic subprogram, unless it is intrinsic or
1074 -- imported so no body is required, or generic package body
1075 -- if the package spec requires a body.
1077 if (Is_Generic_Subprogram (Nam)
1078 and then not Is_Intrinsic_Subprogram (Nam)
1079 and then not Is_Imported (Nam))
1080 or else (Ekind (Nam) = E_Generic_Package
1081 and then Unit_Requires_Body (Nam))
1083 Style_Check := False;
1085 if Present (Renamed_Object (Nam)) then
1088 (Load_Name => Get_Body_Name
1090 (Unit_Declaration_Node
1091 (Renamed_Object (Nam)))),
1099 (Load_Name => Get_Body_Name
1100 (Get_Unit_Name (Item)),
1107 if Un = No_Unit then
1109 ("body of generic unit& not found", Item, Nam);
1112 elsif not Analyzed (Cunit (Un))
1113 and then Un /= Main_Unit
1114 and then not Fatal_Error (Un)
1116 Style_Check := False;
1117 Semantics (Cunit (Un));
1125 Style_Check := Save_Style_Check;
1126 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1130 -- Deal with creating elaboration Boolean if needed. We create an
1131 -- elaboration boolean only for units that come from source since
1132 -- units manufactured by the compiler never need elab checks.
1134 if Comes_From_Source (N)
1135 and then Nkind_In (Unit_Node, N_Package_Declaration,
1136 N_Generic_Package_Declaration,
1137 N_Subprogram_Declaration,
1138 N_Generic_Subprogram_Declaration)
1141 Loc : constant Source_Ptr := Sloc (N);
1142 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1145 Spec_Id := Defining_Entity (Unit_Node);
1146 Generate_Definition (Spec_Id);
1148 -- See if an elaboration entity is required for possible access
1149 -- before elaboration checking. Note that we must allow for this
1150 -- even if -gnatE is not set, since a client may be compiled in
1151 -- -gnatE mode and reference the entity.
1153 -- These entities are also used by the binder to prevent multiple
1154 -- attempts to execute the elaboration code for the library case
1155 -- where the elaboration routine might otherwise be called more
1158 -- Case of units which do not require elaboration checks
1161 -- Pure units do not need checks
1165 -- Preelaborated units do not need checks
1167 or else Is_Preelaborated (Spec_Id)
1169 -- No checks needed if pragma Elaborate_Body present
1171 or else Has_Pragma_Elaborate_Body (Spec_Id)
1173 -- No checks needed if unit does not require a body
1175 or else not Unit_Requires_Body (Spec_Id)
1177 -- No checks needed for predefined files
1179 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1181 -- No checks required if no separate spec
1183 or else Acts_As_Spec (N)
1185 -- This is a case where we only need the entity for
1186 -- checking to prevent multiple elaboration checks.
1188 Set_Elaboration_Entity_Required (Spec_Id, False);
1190 -- Case of elaboration entity is required for access before
1191 -- elaboration checking (so certainly we must build it!)
1194 Set_Elaboration_Entity_Required (Spec_Id, True);
1197 Build_Elaboration_Entity (N, Spec_Id);
1201 -- Freeze the compilation unit entity. This for sure is needed because
1202 -- of some warnings that can be output (see Freeze_Subprogram), but may
1203 -- in general be required. If freezing actions result, place them in the
1204 -- compilation unit actions list, and analyze them.
1207 Loc : constant Source_Ptr := Sloc (N);
1208 L : constant List_Id :=
1209 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), Loc);
1211 while Is_Non_Empty_List (L) loop
1212 Insert_Library_Level_Action (Remove_Head (L));
1218 if Nkind (Unit_Node) = N_Package_Declaration
1219 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1220 and then Expander_Active
1223 Save_Style_Check : constant Boolean := Style_Check;
1224 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1225 Options : Style_Check_Options;
1228 Save_Style_Check_Options (Options);
1229 Reset_Style_Check_Options;
1230 Opt.Warning_Mode := Suppress;
1231 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1233 Reset_Style_Check_Options;
1234 Set_Style_Check_Options (Options);
1235 Style_Check := Save_Style_Check;
1236 Warning_Mode := Save_Warning;
1240 -- If we are generating obsolescent warnings, then here is where we
1241 -- generate them for the with'ed items. The reason for this special
1242 -- processing is that the normal mechanism of generating the warnings
1243 -- for referenced entities does not work for context clause references.
1244 -- That's because when we first analyze the context, it is too early to
1245 -- know if the with'ing unit is itself obsolescent (which suppresses
1248 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1250 -- Push current compilation unit as scope, so that the test for
1251 -- being within an obsolescent unit will work correctly.
1253 Push_Scope (Defining_Entity (Unit_Node));
1255 -- Loop through context items to deal with with clauses
1263 Item := First (Context_Items (N));
1264 while Present (Item) loop
1265 if Nkind (Item) = N_With_Clause
1267 -- Suppress this check in limited-withed units. Further work
1268 -- needed here if we decide to incorporate this check on
1269 -- limited-withed units.
1271 and then not Limited_Present (Item)
1274 Ent := Entity (Nam);
1276 if Is_Obsolescent (Ent) then
1277 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1285 -- Remove temporary install of current unit as scope
1289 end Analyze_Compilation_Unit;
1291 ---------------------
1292 -- Analyze_Context --
1293 ---------------------
1295 procedure Analyze_Context (N : Node_Id) is
1296 Ukind : constant Node_Kind := Nkind (Unit (N));
1300 -- First process all configuration pragmas at the start of the context
1301 -- items. Strictly these are not part of the context clause, but that
1302 -- is where the parser puts them. In any case for sure we must analyze
1303 -- these before analyzing the actual context items, since they can have
1304 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1305 -- be with'ed as a result of changing categorizations in Ada 2005).
1307 Item := First (Context_Items (N));
1308 while Present (Item)
1309 and then Nkind (Item) = N_Pragma
1310 and then Pragma_Name (Item) in Configuration_Pragma_Names
1316 -- This is the point at which we capture the configuration settings
1317 -- for the unit. At the moment only the Optimize_Alignment setting
1318 -- needs to be captured. Probably more later ???
1320 if Optimize_Alignment_Local then
1321 Set_OA_Setting (Current_Sem_Unit, 'L');
1323 Set_OA_Setting (Current_Sem_Unit, Optimize_Alignment);
1326 -- Loop through actual context items. This is done in two passes:
1328 -- a) The first pass analyzes non-limited with-clauses and also any
1329 -- configuration pragmas (we need to get the latter analyzed right
1330 -- away, since they can affect processing of subsequent items.
1332 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1334 while Present (Item) loop
1336 -- For with clause, analyze the with clause, and then update the
1337 -- version, since we are dependent on a unit that we with.
1339 if Nkind (Item) = N_With_Clause
1340 and then not Limited_Present (Item)
1342 -- Skip analyzing with clause if no unit, nothing to do (this
1343 -- happens for a with that references a non-existent unit). Skip
1344 -- as well if this is a with_clause for the main unit, which
1345 -- happens if a subunit has a useless with_clause on its parent.
1347 if Present (Library_Unit (Item)) then
1348 if Library_Unit (Item) /= Cunit (Current_Sem_Unit) then
1352 Set_Entity (Name (Item), Cunit_Entity (Current_Sem_Unit));
1356 if not Implicit_With (Item) then
1357 Version_Update (N, Library_Unit (Item));
1360 -- Skip pragmas. Configuration pragmas at the start were handled in
1361 -- the loop above, and remaining pragmas are not processed until we
1362 -- actually install the context (see Install_Context). We delay the
1363 -- analysis of these pragmas to make sure that we have installed all
1364 -- the implicit with's on parent units.
1366 -- Skip use clauses at this stage, since we don't want to do any
1367 -- installing of potentially use-visible entities until we
1368 -- actually install the complete context (in Install_Context).
1369 -- Otherwise things can get installed in the wrong context.
1378 -- Second pass: examine all limited_with clauses. All other context
1379 -- items are ignored in this pass.
1381 Item := First (Context_Items (N));
1382 while Present (Item) loop
1383 if Nkind (Item) = N_With_Clause
1384 and then Limited_Present (Item)
1386 -- No need to check errors on implicitly generated limited-with
1389 if not Implicit_With (Item) then
1391 -- Verify that the illegal contexts given in 10.1.2 (18/2) are
1392 -- properly rejected, including renaming declarations.
1394 if not Nkind_In (Ukind, N_Package_Declaration,
1395 N_Subprogram_Declaration)
1396 and then Ukind not in N_Generic_Declaration
1397 and then Ukind not in N_Generic_Instantiation
1399 Error_Msg_N ("limited with_clause not allowed here", Item);
1401 -- Check wrong use of a limited with clause applied to the
1402 -- compilation unit containing the limited-with clause.
1404 -- limited with P.Q;
1405 -- package P.Q is ...
1407 elsif Unit (Library_Unit (Item)) = Unit (N) then
1408 Error_Msg_N ("wrong use of limited-with clause", Item);
1410 -- Check wrong use of limited-with clause applied to some
1411 -- immediate ancestor.
1413 elsif Is_Child_Spec (Unit (N)) then
1415 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1419 P := Parent_Spec (Unit (N));
1421 if Unit (P) = Lib_U then
1422 Error_Msg_N ("limited with_clause of immediate "
1423 & "ancestor not allowed", Item);
1427 exit when not Is_Child_Spec (Unit (P));
1428 P := Parent_Spec (Unit (P));
1433 -- Check if the limited-withed unit is already visible through
1434 -- some context clause of the current compilation unit or some
1435 -- ancestor of the current compilation unit.
1438 Lim_Unit_Name : constant Node_Id := Name (Item);
1439 Comp_Unit : Node_Id;
1441 Unit_Name : Node_Id;
1446 It := First (Context_Items (Comp_Unit));
1447 while Present (It) loop
1449 and then Nkind (It) = N_With_Clause
1450 and then not Limited_Present (It)
1452 Nkind_In (Unit (Library_Unit (It)),
1453 N_Package_Declaration,
1454 N_Package_Renaming_Declaration)
1456 if Nkind (Unit (Library_Unit (It))) =
1457 N_Package_Declaration
1459 Unit_Name := Name (It);
1461 Unit_Name := Name (Unit (Library_Unit (It)));
1464 -- Check if the named package (or some ancestor)
1465 -- leaves visible the full-view of the unit given
1466 -- in the limited-with clause
1469 if Designate_Same_Unit (Lim_Unit_Name,
1472 Error_Msg_Sloc := Sloc (It);
1474 ("simultaneous visibility of limited "
1475 & "and unlimited views not allowed",
1478 ("\unlimited view visible through "
1479 & "context clause #",
1483 elsif Nkind (Unit_Name) = N_Identifier then
1487 Unit_Name := Prefix (Unit_Name);
1494 exit when not Is_Child_Spec (Unit (Comp_Unit));
1496 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1501 -- Skip analyzing with clause if no unit, see above
1503 if Present (Library_Unit (Item)) then
1507 -- A limited_with does not impose an elaboration order, but
1508 -- there is a semantic dependency for recompilation purposes.
1510 if not Implicit_With (Item) then
1511 Version_Update (N, Library_Unit (Item));
1514 -- Pragmas and use clauses and with clauses other than limited
1515 -- with's are ignored in this pass through the context items.
1523 end Analyze_Context;
1525 -------------------------------
1526 -- Analyze_Package_Body_Stub --
1527 -------------------------------
1529 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1530 Id : constant Entity_Id := Defining_Identifier (N);
1534 -- The package declaration must be in the current declarative part
1536 Check_Stub_Level (N);
1537 Nam := Current_Entity_In_Scope (Id);
1539 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1540 Error_Msg_N ("missing specification for package stub", N);
1542 elsif Has_Completion (Nam)
1543 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1545 Error_Msg_N ("duplicate or redundant stub for package", N);
1548 -- Indicate that the body of the package exists. If we are doing
1549 -- only semantic analysis, the stub stands for the body. If we are
1550 -- generating code, the existence of the body will be confirmed
1551 -- when we load the proper body.
1553 Set_Has_Completion (Nam);
1554 Set_Scope (Defining_Entity (N), Current_Scope);
1555 Generate_Reference (Nam, Id, 'b');
1556 Analyze_Proper_Body (N, Nam);
1558 end Analyze_Package_Body_Stub;
1560 -------------------------
1561 -- Analyze_Proper_Body --
1562 -------------------------
1564 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1565 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1566 Unum : Unit_Number_Type;
1568 procedure Optional_Subunit;
1569 -- This procedure is called when the main unit is a stub, or when we
1570 -- are not generating code. In such a case, we analyze the subunit if
1571 -- present, which is user-friendly and in fact required for ASIS, but
1572 -- we don't complain if the subunit is missing.
1574 ----------------------
1575 -- Optional_Subunit --
1576 ----------------------
1578 procedure Optional_Subunit is
1579 Comp_Unit : Node_Id;
1582 -- Try to load subunit, but ignore any errors that occur during
1583 -- the loading of the subunit, by using the special feature in
1584 -- Errout to ignore all errors. Note that Fatal_Error will still
1585 -- be set, so we will be able to check for this case below.
1587 if not ASIS_Mode then
1588 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1593 (Load_Name => Subunit_Name,
1598 if not ASIS_Mode then
1599 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1602 -- All done if we successfully loaded the subunit
1605 and then (not Fatal_Error (Unum) or else Try_Semantics)
1607 Comp_Unit := Cunit (Unum);
1609 -- If the file was empty or seriously mangled, the unit itself may
1612 if No (Unit (Comp_Unit)) then
1614 ("subunit does not contain expected proper body", N);
1616 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1618 ("expected SEPARATE subunit, found child unit",
1619 Cunit_Entity (Unum));
1621 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1622 Analyze_Subunit (Comp_Unit);
1623 Set_Library_Unit (N, Comp_Unit);
1626 elsif Unum = No_Unit
1627 and then Present (Nam)
1629 if Is_Protected_Type (Nam) then
1630 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1632 Set_Corresponding_Body (
1633 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1636 end Optional_Subunit;
1638 -- Start of processing for Analyze_Proper_Body
1641 -- If the subunit is already loaded, it means that the main unit is a
1642 -- subunit, and that the current unit is one of its parents which was
1643 -- being analyzed to provide the needed context for the analysis of the
1644 -- subunit. In this case we analyze the subunit and continue with the
1645 -- parent, without looking a subsequent subunits.
1647 if Is_Loaded (Subunit_Name) then
1649 -- If the proper body is already linked to the stub node, the stub is
1650 -- in a generic unit and just needs analyzing.
1652 if Present (Library_Unit (N)) then
1653 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1654 Analyze_Subunit (Library_Unit (N));
1656 -- Otherwise we must load the subunit and link to it
1659 -- Load the subunit, this must work, since we originally loaded
1660 -- the subunit earlier on. So this will not really load it, just
1661 -- give access to it.
1665 (Load_Name => Subunit_Name,
1670 -- And analyze the subunit in the parent context (note that we
1671 -- do not call Semantics, since that would remove the parent
1672 -- context). Because of this, we have to manually reset the
1673 -- compiler state to Analyzing since it got destroyed by Load.
1675 if Unum /= No_Unit then
1676 Compiler_State := Analyzing;
1678 -- Check that the proper body is a subunit and not a child
1679 -- unit. If the unit was previously loaded, the error will
1680 -- have been emitted when copying the generic node, so we
1681 -- just return to avoid cascaded errors.
1683 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1687 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1688 Analyze_Subunit (Cunit (Unum));
1689 Set_Library_Unit (N, Cunit (Unum));
1693 -- If the main unit is a subunit, then we are just performing semantic
1694 -- analysis on that subunit, and any other subunits of any parent unit
1695 -- should be ignored, except that if we are building trees for ASIS
1696 -- usage we want to annotate the stub properly.
1698 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1699 and then Subunit_Name /= Unit_Name (Main_Unit)
1705 -- But before we return, set the flag for unloaded subunits. This
1706 -- will suppress junk warnings of variables in the same declarative
1707 -- part (or a higher level one) that are in danger of looking unused
1708 -- when in fact there might be a declaration in the subunit that we
1709 -- do not intend to load.
1711 Unloaded_Subunits := True;
1714 -- If the subunit is not already loaded, and we are generating code,
1715 -- then this is the case where compilation started from the parent,
1716 -- and we are generating code for an entire subunit tree. In that
1717 -- case we definitely need to load the subunit.
1719 -- In order to continue the analysis with the rest of the parent,
1720 -- and other subunits, we load the unit without requiring its
1721 -- presence, and emit a warning if not found, rather than terminating
1722 -- the compilation abruptly, as for other missing file problems.
1724 elsif Original_Operating_Mode = Generate_Code then
1726 -- If the proper body is already linked to the stub node,
1727 -- the stub is in a generic unit and just needs analyzing.
1729 -- We update the version. Although we are not technically
1730 -- semantically dependent on the subunit, given our approach
1731 -- of macro substitution of subunits, it makes sense to
1732 -- include it in the version identification.
1734 if Present (Library_Unit (N)) then
1735 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1736 Analyze_Subunit (Library_Unit (N));
1737 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1739 -- Otherwise we must load the subunit and link to it
1744 (Load_Name => Subunit_Name,
1749 -- Give message if we did not get the unit
1751 if Original_Operating_Mode = Generate_Code
1752 and then Unum = No_Unit
1754 Error_Msg_Unit_1 := Subunit_Name;
1756 Get_File_Name (Subunit_Name, Subunit => True);
1758 ("subunit$$ in file{ not found?", N);
1759 Subunits_Missing := True;
1762 -- Load_Unit may reset Compiler_State, since it may have been
1763 -- necessary to parse an additional units, so we make sure
1764 -- that we reset it to the Analyzing state.
1766 Compiler_State := Analyzing;
1768 if Unum /= No_Unit then
1769 if Debug_Flag_L then
1770 Write_Str ("*** Loaded subunit from stub. Analyze");
1775 Comp_Unit : constant Node_Id := Cunit (Unum);
1778 -- Check for child unit instead of subunit
1780 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1782 ("expected SEPARATE subunit, found child unit",
1783 Cunit_Entity (Unum));
1785 -- OK, we have a subunit
1788 -- Set corresponding stub (even if errors)
1790 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1792 -- Collect SCO information for loaded subunit if we are
1793 -- in the main unit).
1797 In_Extended_Main_Source_Unit
1798 (Cunit_Entity (Current_Sem_Unit))
1803 -- Analyze the unit if semantics active
1805 if not Fatal_Error (Unum) or else Try_Semantics then
1806 Analyze_Subunit (Comp_Unit);
1809 -- Set the library unit pointer in any case
1811 Set_Library_Unit (N, Comp_Unit);
1813 -- We update the version. Although we are not technically
1814 -- semantically dependent on the subunit, given our
1815 -- approach of macro substitution of subunits, it makes
1816 -- sense to include it in the version identification.
1818 Version_Update (Cunit (Main_Unit), Comp_Unit);
1824 -- The remaining case is when the subunit is not already loaded and
1825 -- we are not generating code. In this case we are just performing
1826 -- semantic analysis on the parent, and we are not interested in
1827 -- the subunit. For subprograms, analyze the stub as a body. For
1828 -- other entities the stub has already been marked as completed.
1833 end Analyze_Proper_Body;
1835 ----------------------------------
1836 -- Analyze_Protected_Body_Stub --
1837 ----------------------------------
1839 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1840 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1843 Check_Stub_Level (N);
1845 -- First occurrence of name may have been as an incomplete type
1847 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1848 Nam := Full_View (Nam);
1852 or else not Is_Protected_Type (Etype (Nam))
1854 Error_Msg_N ("missing specification for Protected body", N);
1856 Set_Scope (Defining_Entity (N), Current_Scope);
1857 Set_Has_Completion (Etype (Nam));
1858 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1859 Analyze_Proper_Body (N, Etype (Nam));
1861 end Analyze_Protected_Body_Stub;
1863 ----------------------------------
1864 -- Analyze_Subprogram_Body_Stub --
1865 ----------------------------------
1867 -- A subprogram body stub can appear with or without a previous spec. If
1868 -- there is one, then the analysis of the body will find it and verify
1869 -- conformance. The formals appearing in the specification of the stub play
1870 -- no role, except for requiring an additional conformance check. If there
1871 -- is no previous subprogram declaration, the stub acts as a spec, and
1872 -- provides the defining entity for the subprogram.
1874 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1878 Check_Stub_Level (N);
1880 -- Verify that the identifier for the stub is unique within this
1881 -- declarative part.
1883 if Nkind_In (Parent (N), N_Block_Statement,
1887 Decl := First (Declarations (Parent (N)));
1888 while Present (Decl)
1891 if Nkind (Decl) = N_Subprogram_Body_Stub
1892 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1893 Chars (Defining_Unit_Name (Specification (N))))
1895 Error_Msg_N ("identifier for stub is not unique", N);
1902 -- Treat stub as a body, which checks conformance if there is a previous
1903 -- declaration, or else introduces entity and its signature.
1905 Analyze_Subprogram_Body (N);
1906 Analyze_Proper_Body (N, Empty);
1907 end Analyze_Subprogram_Body_Stub;
1909 ---------------------
1910 -- Analyze_Subunit --
1911 ---------------------
1913 -- A subunit is compiled either by itself (for semantic checking) or as
1914 -- part of compiling the parent (for code generation). In either case, by
1915 -- the time we actually process the subunit, the parent has already been
1916 -- installed and analyzed. The node N is a compilation unit, whose context
1917 -- needs to be treated here, because we come directly here from the parent
1918 -- without calling Analyze_Compilation_Unit.
1920 -- The compilation context includes the explicit context of the subunit,
1921 -- and the context of the parent, together with the parent itself. In order
1922 -- to compile the current context, we remove the one inherited from the
1923 -- parent, in order to have a clean visibility table. We restore the parent
1924 -- context before analyzing the proper body itself. On exit, we remove only
1925 -- the explicit context of the subunit.
1927 procedure Analyze_Subunit (N : Node_Id) is
1928 Lib_Unit : constant Node_Id := Library_Unit (N);
1929 Par_Unit : constant Entity_Id := Current_Scope;
1931 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1932 Num_Scopes : Int := 0;
1933 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1934 Enclosing_Child : Entity_Id := Empty;
1935 Svg : constant Suppress_Array := Scope_Suppress;
1937 procedure Analyze_Subunit_Context;
1938 -- Capture names in use clauses of the subunit. This must be done before
1939 -- re-installing parent declarations, because items in the context must
1940 -- not be hidden by declarations local to the parent.
1942 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1943 -- Recursive procedure to restore scope of all ancestors of subunit,
1944 -- from outermost in. If parent is not a subunit, the call to install
1945 -- context installs context of spec and (if parent is a child unit) the
1946 -- context of its parents as well. It is confusing that parents should
1947 -- be treated differently in both cases, but the semantics are just not
1950 procedure Re_Install_Use_Clauses;
1951 -- As part of the removal of the parent scope, the use clauses are
1952 -- removed, to be reinstalled when the context of the subunit has been
1953 -- analyzed. Use clauses may also have been affected by the analysis of
1954 -- the context of the subunit, so they have to be applied again, to
1955 -- insure that the compilation environment of the rest of the parent
1956 -- unit is identical.
1958 procedure Remove_Scope;
1959 -- Remove current scope from scope stack, and preserve the list of use
1960 -- clauses in it, to be reinstalled after context is analyzed.
1962 -----------------------------
1963 -- Analyze_Subunit_Context --
1964 -----------------------------
1966 procedure Analyze_Subunit_Context is
1969 Unit_Name : Entity_Id;
1972 Analyze_Context (N);
1974 -- Make withed units immediately visible. If child unit, make the
1975 -- ultimate parent immediately visible.
1977 Item := First (Context_Items (N));
1978 while Present (Item) loop
1979 if Nkind (Item) = N_With_Clause then
1981 -- Protect frontend against previous errors in context clauses
1983 if Nkind (Name (Item)) /= N_Selected_Component then
1984 if Error_Posted (Item) then
1988 Unit_Name := Entity (Name (Item));
1989 while Is_Child_Unit (Unit_Name) loop
1990 Set_Is_Visible_Child_Unit (Unit_Name);
1991 Unit_Name := Scope (Unit_Name);
1994 if not Is_Immediately_Visible (Unit_Name) then
1995 Set_Is_Immediately_Visible (Unit_Name);
1996 Set_Context_Installed (Item);
2001 elsif Nkind (Item) = N_Use_Package_Clause then
2002 Nam := First (Names (Item));
2003 while Present (Nam) loop
2008 elsif Nkind (Item) = N_Use_Type_Clause then
2009 Nam := First (Subtype_Marks (Item));
2010 while Present (Nam) loop
2019 -- Reset visibility of withed units. They will be made visible again
2020 -- when we install the subunit context.
2022 Item := First (Context_Items (N));
2023 while Present (Item) loop
2024 if Nkind (Item) = N_With_Clause
2026 -- Protect frontend against previous errors in context clauses
2028 and then Nkind (Name (Item)) /= N_Selected_Component
2029 and then not Error_Posted (Item)
2031 Unit_Name := Entity (Name (Item));
2032 while Is_Child_Unit (Unit_Name) loop
2033 Set_Is_Visible_Child_Unit (Unit_Name, False);
2034 Unit_Name := Scope (Unit_Name);
2037 if Context_Installed (Item) then
2038 Set_Is_Immediately_Visible (Unit_Name, False);
2039 Set_Context_Installed (Item, False);
2045 end Analyze_Subunit_Context;
2047 ------------------------
2048 -- Re_Install_Parents --
2049 ------------------------
2051 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
2055 if Nkind (Unit (L)) = N_Subunit then
2056 Re_Install_Parents (Library_Unit (L), Scope (Scop));
2059 Install_Context (L);
2061 -- If the subunit occurs within a child unit, we must restore the
2062 -- immediate visibility of any siblings that may occur in context.
2064 if Present (Enclosing_Child) then
2065 Install_Siblings (Enclosing_Child, L);
2070 if Scop /= Par_Unit then
2071 Set_Is_Immediately_Visible (Scop);
2074 -- Make entities in scope visible again. For child units, restore
2075 -- visibility only if they are actually in context.
2077 E := First_Entity (Current_Scope);
2078 while Present (E) loop
2079 if not Is_Child_Unit (E)
2080 or else Is_Visible_Child_Unit (E)
2082 Set_Is_Immediately_Visible (E);
2088 -- A subunit appears within a body, and for a nested subunits all the
2089 -- parents are bodies. Restore full visibility of their private
2092 if Is_Package_Or_Generic_Package (Scop) then
2093 Set_In_Package_Body (Scop);
2094 Install_Private_Declarations (Scop);
2096 end Re_Install_Parents;
2098 ----------------------------
2099 -- Re_Install_Use_Clauses --
2100 ----------------------------
2102 procedure Re_Install_Use_Clauses is
2105 for J in reverse 1 .. Num_Scopes loop
2106 U := Use_Clauses (J);
2107 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2108 Install_Use_Clauses (U, Force_Installation => True);
2110 end Re_Install_Use_Clauses;
2116 procedure Remove_Scope is
2120 Num_Scopes := Num_Scopes + 1;
2121 Use_Clauses (Num_Scopes) :=
2122 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2124 E := First_Entity (Current_Scope);
2125 while Present (E) loop
2126 Set_Is_Immediately_Visible (E, False);
2130 if Is_Child_Unit (Current_Scope) then
2131 Enclosing_Child := Current_Scope;
2137 -- Start of processing for Analyze_Subunit
2140 if not Is_Empty_List (Context_Items (N)) then
2142 -- Save current use clauses
2145 Remove_Context (Lib_Unit);
2147 -- Now remove parents and their context, including enclosing subunits
2148 -- and the outer parent body which is not a subunit.
2150 if Present (Lib_Spec) then
2151 Remove_Context (Lib_Spec);
2153 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2154 Lib_Spec := Library_Unit (Lib_Spec);
2156 Remove_Context (Lib_Spec);
2159 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2163 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2164 Remove_Context (Library_Unit (Lib_Spec));
2168 Set_Is_Immediately_Visible (Par_Unit, False);
2170 Analyze_Subunit_Context;
2172 Re_Install_Parents (Lib_Unit, Par_Unit);
2173 Set_Is_Immediately_Visible (Par_Unit);
2175 -- If the context includes a child unit of the parent of the subunit,
2176 -- the parent will have been removed from visibility, after compiling
2177 -- that cousin in the context. The visibility of the parent must be
2178 -- restored now. This also applies if the context includes another
2179 -- subunit of the same parent which in turn includes a child unit in
2182 if Is_Package_Or_Generic_Package (Par_Unit) then
2183 if not Is_Immediately_Visible (Par_Unit)
2184 or else (Present (First_Entity (Par_Unit))
2185 and then not Is_Immediately_Visible
2186 (First_Entity (Par_Unit)))
2188 Set_Is_Immediately_Visible (Par_Unit);
2189 Install_Visible_Declarations (Par_Unit);
2190 Install_Private_Declarations (Par_Unit);
2194 Re_Install_Use_Clauses;
2195 Install_Context (N);
2197 -- Restore state of suppress flags for current body
2199 Scope_Suppress := Svg;
2201 -- If the subunit is within a child unit, then siblings of any parent
2202 -- unit that appear in the context clause of the subunit must also be
2203 -- made immediately visible.
2205 if Present (Enclosing_Child) then
2206 Install_Siblings (Enclosing_Child, N);
2211 Analyze (Proper_Body (Unit (N)));
2214 -- The subunit may contain a with_clause on a sibling of some ancestor.
2215 -- Removing the context will remove from visibility those ancestor child
2216 -- units, which must be restored to the visibility they have in the
2219 if Present (Enclosing_Child) then
2225 and then Is_Child_Unit (C)
2227 Set_Is_Immediately_Visible (C);
2228 Set_Is_Visible_Child_Unit (C);
2233 end Analyze_Subunit;
2235 ----------------------------
2236 -- Analyze_Task_Body_Stub --
2237 ----------------------------
2239 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2240 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2241 Loc : constant Source_Ptr := Sloc (N);
2244 Check_Stub_Level (N);
2246 -- First occurrence of name may have been as an incomplete type
2248 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2249 Nam := Full_View (Nam);
2252 if No (Nam) or else not Is_Task_Type (Etype (Nam)) then
2253 Error_Msg_N ("missing specification for task body", N);
2255 Set_Scope (Defining_Entity (N), Current_Scope);
2256 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2257 Set_Has_Completion (Etype (Nam));
2258 Analyze_Proper_Body (N, Etype (Nam));
2260 -- Set elaboration flag to indicate that entity is callable. This
2261 -- cannot be done in the expansion of the body itself, because the
2262 -- proper body is not in a declarative part. This is only done if
2263 -- expansion is active, because the context may be generic and the
2264 -- flag not defined yet.
2266 if Expander_Active then
2268 Make_Assignment_Statement (Loc,
2270 Make_Identifier (Loc,
2271 New_External_Name (Chars (Etype (Nam)), 'E')),
2272 Expression => New_Reference_To (Standard_True, Loc)));
2275 end Analyze_Task_Body_Stub;
2277 -------------------------
2278 -- Analyze_With_Clause --
2279 -------------------------
2281 -- Analyze the declaration of a unit in a with clause. At end, label the
2282 -- with clause with the defining entity for the unit.
2284 procedure Analyze_With_Clause (N : Node_Id) is
2286 -- Retrieve the original kind of the unit node, before analysis. If it
2287 -- is a subprogram instantiation, its analysis below will rewrite the
2288 -- node as the declaration of the wrapper package. If the same
2289 -- instantiation appears indirectly elsewhere in the context, it will
2290 -- have been analyzed already.
2292 Unit_Kind : constant Node_Kind :=
2293 Nkind (Original_Node (Unit (Library_Unit (N))));
2294 Nam : constant Node_Id := Name (N);
2296 Par_Name : Entity_Id;
2301 -- Set True if the unit currently being compiled is an internal unit
2303 Save_Style_Check : constant Boolean := Opt.Style_Check;
2304 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
2305 Cunit_Boolean_Restrictions_Save;
2308 U := Unit (Library_Unit (N));
2310 -- Several actions are skipped for dummy packages (those supplied for
2311 -- with's where no matching file could be found). Such packages are
2312 -- identified by the Sloc value being set to No_Location.
2314 if Limited_Present (N) then
2316 -- Ada 2005 (AI-50217): Build visibility structures but do not
2317 -- analyze the unit.
2319 if Sloc (U) /= No_Location then
2320 Build_Limited_Views (N);
2326 -- We reset ordinary style checking during the analysis of a with'ed
2327 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2328 -- definitely *does* apply to with'ed units).
2330 if not GNAT_Mode then
2331 Style_Check := False;
2334 -- If the library unit is a predefined unit, and we are in high
2335 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2336 -- for the analysis of the with'ed unit. This mode does not prevent
2337 -- explicit with'ing of run-time units.
2339 if Configurable_Run_Time_Mode
2341 Is_Predefined_File_Name
2342 (Unit_File_Name (Get_Source_Unit (Unit (Library_Unit (N)))))
2344 Configurable_Run_Time_Mode := False;
2345 Semantics (Library_Unit (N));
2346 Configurable_Run_Time_Mode := True;
2349 Semantics (Library_Unit (N));
2352 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2354 if Sloc (U) /= No_Location then
2356 -- Check restrictions, except that we skip the check if this is an
2357 -- internal unit unless we are compiling the internal unit as the
2358 -- main unit. We also skip this for dummy packages.
2360 Check_Restriction_No_Dependence (Nam, N);
2362 if not Intunit or else Current_Sem_Unit = Main_Unit then
2363 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2366 -- Deal with special case of GNAT.Current_Exceptions which interacts
2367 -- with the optimization of local raise statements into gotos.
2369 if Nkind (Nam) = N_Selected_Component
2370 and then Nkind (Prefix (Nam)) = N_Identifier
2371 and then Chars (Prefix (Nam)) = Name_Gnat
2372 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2374 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2376 Check_Restriction (No_Exception_Propagation, N);
2377 Special_Exception_Package_Used := True;
2380 -- Check for inappropriate with of internal implementation unit if we
2381 -- are not compiling an internal unit. We do not issue this message
2382 -- for implicit with's generated by the compiler itself.
2384 if Implementation_Unit_Warnings
2385 and then not Intunit
2386 and then not Implicit_With (N)
2389 U_Kind : constant Kind_Of_Unit :=
2390 Get_Kind_Of_Unit (Get_Source_Unit (U));
2393 if U_Kind = Implementation_Unit then
2394 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2396 -- Add alternative name if available, otherwise issue a
2397 -- general warning message.
2399 if Error_Msg_Strlen /= 0 then
2400 Error_Msg_F ("\use ""~"" instead", Name (N));
2403 ("\use of this unit is non-portable " &
2404 "and version-dependent?", Name (N));
2407 elsif U_Kind = Ada_05_Unit
2408 and then Ada_Version < Ada_05
2409 and then Warn_On_Ada_2005_Compatibility
2411 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2417 -- Semantic analysis of a generic unit is performed on a copy of
2418 -- the original tree. Retrieve the entity on which semantic info
2419 -- actually appears.
2421 if Unit_Kind in N_Generic_Declaration then
2422 E_Name := Defining_Entity (U);
2424 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2425 -- the case of an instantiation, semantic analysis above will have
2426 -- replaced the unit by its instantiated version. If the instance body
2427 -- has been generated, the instance now denotes the body entity. For
2428 -- visibility purposes we need the entity of its spec.
2430 elsif (Unit_Kind = N_Package_Instantiation
2431 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2432 N_Package_Instantiation)
2433 and then Nkind (U) = N_Package_Body
2435 E_Name := Corresponding_Spec (U);
2437 elsif Unit_Kind = N_Package_Instantiation
2438 and then Nkind (U) = N_Package_Instantiation
2440 -- If the instance has not been rewritten as a package declaration,
2441 -- then it appeared already in a previous with clause. Retrieve
2442 -- the entity from the previous instance.
2444 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2446 elsif Unit_Kind in N_Subprogram_Instantiation then
2448 -- The visible subprogram is created during instantiation, and is
2449 -- an attribute of the wrapper package. We retrieve the wrapper
2450 -- package directly from the instantiation node. If the instance
2451 -- is inlined the unit is still an instantiation. Otherwise it has
2452 -- been rewritten as the declaration of the wrapper itself.
2454 if Nkind (U) in N_Subprogram_Instantiation then
2457 (Defining_Entity (Specification (Instance_Spec (U))));
2459 E_Name := Related_Instance (Defining_Entity (U));
2462 elsif Unit_Kind = N_Package_Renaming_Declaration
2463 or else Unit_Kind in N_Generic_Renaming_Declaration
2465 E_Name := Defining_Entity (U);
2467 elsif Unit_Kind = N_Subprogram_Body
2468 and then Nkind (Name (N)) = N_Selected_Component
2469 and then not Acts_As_Spec (Library_Unit (N))
2471 -- For a child unit that has no spec, one has been created and
2472 -- analyzed. The entity required is that of the spec.
2474 E_Name := Corresponding_Spec (U);
2477 E_Name := Defining_Entity (U);
2480 if Nkind (Name (N)) = N_Selected_Component then
2482 -- Child unit in a with clause
2484 Change_Selected_Component_To_Expanded_Name (Name (N));
2487 -- Restore style checks and restrictions
2489 Style_Check := Save_Style_Check;
2490 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2492 -- Record the reference, but do NOT set the unit as referenced, we want
2493 -- to consider the unit as unreferenced if this is the only reference
2496 Set_Entity_With_Style_Check (Name (N), E_Name);
2497 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2499 -- Generate references and check No_Dependence restriction for parents
2501 if Is_Child_Unit (E_Name) then
2502 Pref := Prefix (Name (N));
2503 Par_Name := Scope (E_Name);
2504 while Nkind (Pref) = N_Selected_Component loop
2505 Change_Selected_Component_To_Expanded_Name (Pref);
2506 Set_Entity_With_Style_Check (Pref, Par_Name);
2508 Generate_Reference (Par_Name, Pref);
2509 Check_Restriction_No_Dependence (Pref, N);
2510 Pref := Prefix (Pref);
2512 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2513 -- is set to Standard_Standard, and no attempt should be made to
2514 -- further unwind scopes.
2516 if Par_Name /= Standard_Standard then
2517 Par_Name := Scope (Par_Name);
2521 if Present (Entity (Pref))
2522 and then not Analyzed (Parent (Parent (Entity (Pref))))
2524 -- If the entity is set without its unit being compiled, the
2525 -- original parent is a renaming, and Par_Name is the renamed
2526 -- entity. For visibility purposes, we need the original entity,
2527 -- which must be analyzed now because Load_Unit directly retrieves
2528 -- the renamed unit, and the renaming declaration itself has not
2531 Analyze (Parent (Parent (Entity (Pref))));
2532 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2533 Par_Name := Entity (Pref);
2536 Set_Entity_With_Style_Check (Pref, Par_Name);
2537 Generate_Reference (Par_Name, Pref);
2540 -- If the withed unit is System, and a system extension pragma is
2541 -- present, compile the extension now, rather than waiting for a
2542 -- visibility check on a specific entity.
2544 if Chars (E_Name) = Name_System
2545 and then Scope (E_Name) = Standard_Standard
2546 and then Present (System_Extend_Unit)
2547 and then Present_System_Aux (N)
2549 -- If the extension is not present, an error will have been emitted
2554 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2555 -- to private_with units; they will be made visible later (just before
2556 -- the private part is analyzed)
2558 if Private_Present (N) then
2559 Set_Is_Immediately_Visible (E_Name, False);
2561 end Analyze_With_Clause;
2563 ------------------------------
2564 -- Check_Private_Child_Unit --
2565 ------------------------------
2567 procedure Check_Private_Child_Unit (N : Node_Id) is
2568 Lib_Unit : constant Node_Id := Unit (N);
2570 Curr_Unit : Entity_Id;
2571 Sub_Parent : Node_Id;
2572 Priv_Child : Entity_Id;
2573 Par_Lib : Entity_Id;
2576 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2577 -- Returns true if and only if the library unit is declared with
2578 -- an explicit designation of private.
2580 -----------------------------
2581 -- Is_Private_Library_Unit --
2582 -----------------------------
2584 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2585 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2588 return Private_Present (Comp_Unit);
2589 end Is_Private_Library_Unit;
2591 -- Start of processing for Check_Private_Child_Unit
2594 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2595 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2596 Par_Lib := Curr_Unit;
2598 elsif Nkind (Lib_Unit) = N_Subunit then
2600 -- The parent is itself a body. The parent entity is to be found in
2601 -- the corresponding spec.
2603 Sub_Parent := Library_Unit (N);
2604 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2606 -- If the parent itself is a subunit, Curr_Unit is the entity
2607 -- of the enclosing body, retrieve the spec entity which is
2608 -- the proper ancestor we need for the following tests.
2610 if Ekind (Curr_Unit) = E_Package_Body then
2611 Curr_Unit := Spec_Entity (Curr_Unit);
2614 Par_Lib := Curr_Unit;
2617 Curr_Unit := Defining_Entity (Lib_Unit);
2619 Par_Lib := Curr_Unit;
2620 Par_Spec := Parent_Spec (Lib_Unit);
2622 if No (Par_Spec) then
2625 Par_Lib := Defining_Entity (Unit (Par_Spec));
2629 -- Loop through context items
2631 Item := First (Context_Items (N));
2632 while Present (Item) loop
2634 -- Ada 2005 (AI-262): Allow private_with of a private child package
2635 -- in public siblings
2637 if Nkind (Item) = N_With_Clause
2638 and then not Implicit_With (Item)
2639 and then not Limited_Present (Item)
2640 and then Is_Private_Descendant (Entity (Name (Item)))
2642 Priv_Child := Entity (Name (Item));
2645 Curr_Parent : Entity_Id := Par_Lib;
2646 Child_Parent : Entity_Id := Scope (Priv_Child);
2647 Prv_Ancestor : Entity_Id := Child_Parent;
2648 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2651 -- If the child unit is a public child then locate the nearest
2652 -- private ancestor. Child_Parent will then be set to the
2653 -- parent of that ancestor.
2655 if not Is_Private_Library_Unit (Priv_Child) then
2656 while Present (Prv_Ancestor)
2657 and then not Is_Private_Library_Unit (Prv_Ancestor)
2659 Prv_Ancestor := Scope (Prv_Ancestor);
2662 if Present (Prv_Ancestor) then
2663 Child_Parent := Scope (Prv_Ancestor);
2667 while Present (Curr_Parent)
2668 and then Curr_Parent /= Standard_Standard
2669 and then Curr_Parent /= Child_Parent
2672 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2673 Curr_Parent := Scope (Curr_Parent);
2676 if No (Curr_Parent) then
2677 Curr_Parent := Standard_Standard;
2680 if Curr_Parent /= Child_Parent then
2681 if Ekind (Priv_Child) = E_Generic_Package
2682 and then Chars (Priv_Child) in Text_IO_Package_Name
2683 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2686 ("& is a nested package, not a compilation unit",
2687 Name (Item), Priv_Child);
2691 ("unit in with clause is private child unit!", Item);
2693 ("\current unit must also have parent&!",
2694 Item, Child_Parent);
2698 or else Private_Present (Item)
2699 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2700 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2701 and then not Acts_As_Spec (Parent (Lib_Unit)))
2707 ("current unit must also be private descendant of&",
2708 Item, Child_Parent);
2716 end Check_Private_Child_Unit;
2718 ----------------------
2719 -- Check_Stub_Level --
2720 ----------------------
2722 procedure Check_Stub_Level (N : Node_Id) is
2723 Par : constant Node_Id := Parent (N);
2724 Kind : constant Node_Kind := Nkind (Par);
2727 if Nkind_In (Kind, N_Package_Body,
2731 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2735 -- In an instance, a missing stub appears at any level. A warning
2736 -- message will have been emitted already for the missing file.
2738 elsif not In_Instance then
2739 Error_Msg_N ("stub cannot appear in an inner scope", N);
2741 elsif Expander_Active then
2742 Error_Msg_N ("missing proper body", N);
2744 end Check_Stub_Level;
2746 ------------------------
2747 -- Expand_With_Clause --
2748 ------------------------
2750 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2751 Loc : constant Source_Ptr := Sloc (Nam);
2752 Ent : constant Entity_Id := Entity (Nam);
2756 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2757 -- Build name to be used in implicit with_clause. In most cases this
2758 -- is the source name, but if renamings are present we must make the
2759 -- original unit visible, not the one it renames. The entity in the
2760 -- with clause is the renamed unit, but the identifier is the one from
2761 -- the source, which allows us to recover the unit renaming.
2763 ---------------------
2764 -- Build_Unit_Name --
2765 ---------------------
2767 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2769 Renaming : Entity_Id;
2773 if Nkind (Nam) = N_Identifier then
2775 -- If the parent unit P in the name of the with_clause for P.Q
2776 -- is a renaming of package R, then the entity of the parent is
2777 -- set to R, but the identifier retains Chars (P) to be consistent
2778 -- with the source (see details in lib-load). However, the
2779 -- implicit_with_clause for the parent must make the entity for
2780 -- P visible, because P.Q may be used as a prefix within the
2781 -- current unit. The entity for P is the current_entity with that
2782 -- name, because the package renaming declaration for it has just
2783 -- been analyzed. Note that this case can only happen if P.Q has
2784 -- already appeared in a previous with_clause in a related unit,
2785 -- such as the library body of the current unit.
2787 if Chars (Nam) /= Chars (Entity (Nam)) then
2788 Renaming := Current_Entity (Nam);
2789 pragma Assert (Renamed_Entity (Renaming) = Entity (Nam));
2790 return New_Occurrence_Of (Renaming, Loc);
2793 return New_Occurrence_Of (Entity (Nam), Loc);
2797 Ent := Entity (Nam);
2799 if Present (Entity (Selector_Name (Nam)))
2800 and then Chars (Entity (Selector_Name (Nam))) /= Chars (Ent)
2802 Nkind (Unit_Declaration_Node (Entity (Selector_Name (Nam))))
2803 = N_Package_Renaming_Declaration
2805 -- The name in the with_clause is of the form A.B.C, and B
2806 -- is given by a renaming declaration. In that case we may
2807 -- not have analyzed the unit for B, but replaced it directly
2808 -- in lib-load with the unit it renames. We have to make A.B
2809 -- visible, so analyze the declaration for B now, in case it
2810 -- has not been done yet.
2812 Ent := Entity (Selector_Name (Nam));
2815 (Unit_Declaration_Node (Entity (Selector_Name (Nam)))));
2819 Make_Expanded_Name (Loc,
2820 Chars => Chars (Entity (Nam)),
2821 Prefix => Build_Unit_Name (Prefix (Nam)),
2822 Selector_Name => New_Occurrence_Of (Ent, Loc));
2823 Set_Entity (Result, Ent);
2826 end Build_Unit_Name;
2828 -- Start of processing for Expand_With_Clause
2831 New_Nodes_OK := New_Nodes_OK + 1;
2833 Make_With_Clause (Loc,
2834 Name => Build_Unit_Name (Nam));
2836 P := Parent (Unit_Declaration_Node (Ent));
2837 Set_Library_Unit (Withn, P);
2838 Set_Corresponding_Spec (Withn, Ent);
2839 Set_First_Name (Withn, True);
2840 Set_Implicit_With (Withn, True);
2842 -- If the unit is a package declaration, a private_with_clause on a
2843 -- child unit implies the implicit with on the parent is also private.
2845 if Nkind (Unit (N)) = N_Package_Declaration then
2846 Set_Private_Present (Withn, Private_Present (Item));
2849 Prepend (Withn, Context_Items (N));
2850 Mark_Rewrite_Insertion (Withn);
2851 Install_Withed_Unit (Withn);
2853 if Nkind (Nam) = N_Expanded_Name then
2854 Expand_With_Clause (Item, Prefix (Nam), N);
2857 New_Nodes_OK := New_Nodes_OK - 1;
2858 end Expand_With_Clause;
2860 -----------------------
2861 -- Get_Parent_Entity --
2862 -----------------------
2864 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2866 if Nkind (Unit) = N_Package_Body
2867 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2869 return Defining_Entity
2870 (Specification (Instance_Spec (Original_Node (Unit))));
2871 elsif Nkind (Unit) = N_Package_Instantiation then
2872 return Defining_Entity (Specification (Instance_Spec (Unit)));
2874 return Defining_Entity (Unit);
2876 end Get_Parent_Entity;
2878 ---------------------
2879 -- Has_With_Clause --
2880 ---------------------
2882 function Has_With_Clause
2885 Is_Limited : Boolean := False) return Boolean
2889 function Named_Unit (Clause : Node_Id) return Entity_Id;
2890 -- Return the entity for the unit named in a [limited] with clause
2896 function Named_Unit (Clause : Node_Id) return Entity_Id is
2898 if Nkind (Name (Clause)) = N_Selected_Component then
2899 return Entity (Selector_Name (Name (Clause)));
2901 return Entity (Name (Clause));
2905 -- Start of processing for Has_With_Clause
2908 if Present (Context_Items (C_Unit)) then
2909 Item := First (Context_Items (C_Unit));
2910 while Present (Item) loop
2911 if Nkind (Item) = N_With_Clause
2912 and then Limited_Present (Item) = Is_Limited
2913 and then Named_Unit (Item) = Pack
2923 end Has_With_Clause;
2925 -----------------------------
2926 -- Implicit_With_On_Parent --
2927 -----------------------------
2929 procedure Implicit_With_On_Parent
2930 (Child_Unit : Node_Id;
2933 Loc : constant Source_Ptr := Sloc (N);
2934 P : constant Node_Id := Parent_Spec (Child_Unit);
2935 P_Unit : Node_Id := Unit (P);
2936 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
2939 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
2940 -- Build prefix of child unit name. Recurse if needed
2942 function Build_Unit_Name return Node_Id;
2943 -- If the unit is a child unit, build qualified name with all ancestors
2945 -------------------------
2946 -- Build_Ancestor_Name --
2947 -------------------------
2949 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
2950 P_Ref : constant Node_Id :=
2951 New_Reference_To (Defining_Entity (P), Loc);
2952 P_Spec : Node_Id := P;
2955 -- Ancestor may have been rewritten as a package body. Retrieve
2956 -- the original spec to trace earlier ancestors.
2958 if Nkind (P) = N_Package_Body
2959 and then Nkind (Original_Node (P)) = N_Package_Instantiation
2961 P_Spec := Original_Node (P);
2964 if No (Parent_Spec (P_Spec)) then
2968 Make_Selected_Component (Loc,
2969 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
2970 Selector_Name => P_Ref);
2972 end Build_Ancestor_Name;
2974 ---------------------
2975 -- Build_Unit_Name --
2976 ---------------------
2978 function Build_Unit_Name return Node_Id is
2982 if No (Parent_Spec (P_Unit)) then
2983 return New_Reference_To (P_Name, Loc);
2987 Make_Expanded_Name (Loc,
2988 Chars => Chars (P_Name),
2989 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
2990 Selector_Name => New_Reference_To (P_Name, Loc));
2991 Set_Entity (Result, P_Name);
2994 end Build_Unit_Name;
2996 -- Start of processing for Implicit_With_On_Parent
2999 -- The unit of the current compilation may be a package body that
3000 -- replaces an instance node. In this case we need the original instance
3001 -- node to construct the proper parent name.
3003 if Nkind (P_Unit) = N_Package_Body
3004 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
3006 P_Unit := Original_Node (P_Unit);
3009 -- We add the implicit with if the child unit is the current unit being
3010 -- compiled. If the current unit is a body, we do not want to add an
3011 -- implicit_with a second time to the corresponding spec.
3013 if Nkind (Child_Unit) = N_Package_Declaration
3014 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
3019 New_Nodes_OK := New_Nodes_OK + 1;
3020 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
3022 Set_Library_Unit (Withn, P);
3023 Set_Corresponding_Spec (Withn, P_Name);
3024 Set_First_Name (Withn, True);
3025 Set_Implicit_With (Withn, True);
3027 -- Node is placed at the beginning of the context items, so that
3028 -- subsequent use clauses on the parent can be validated.
3030 Prepend (Withn, Context_Items (N));
3031 Mark_Rewrite_Insertion (Withn);
3032 Install_Withed_Unit (Withn);
3034 if Is_Child_Spec (P_Unit) then
3035 Implicit_With_On_Parent (P_Unit, N);
3038 New_Nodes_OK := New_Nodes_OK - 1;
3039 end Implicit_With_On_Parent;
3045 function In_Chain (E : Entity_Id) return Boolean is
3049 H := Current_Entity (E);
3050 while Present (H) loop
3061 ---------------------
3062 -- Install_Context --
3063 ---------------------
3065 procedure Install_Context (N : Node_Id) is
3066 Lib_Unit : constant Node_Id := Unit (N);
3069 Install_Context_Clauses (N);
3071 if Is_Child_Spec (Lib_Unit) then
3072 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
3075 Install_Limited_Context_Clauses (N);
3076 end Install_Context;
3078 -----------------------------
3079 -- Install_Context_Clauses --
3080 -----------------------------
3082 procedure Install_Context_Clauses (N : Node_Id) is
3083 Lib_Unit : constant Node_Id := Unit (N);
3085 Uname_Node : Entity_Id;
3086 Check_Private : Boolean := False;
3087 Decl_Node : Node_Id;
3088 Lib_Parent : Entity_Id;
3091 -- First skip configuration pragmas at the start of the context. They
3092 -- are not technically part of the context clause, but that's where the
3093 -- parser puts them. Note they were analyzed in Analyze_Context.
3095 Item := First (Context_Items (N));
3096 while Present (Item)
3097 and then Nkind (Item) = N_Pragma
3098 and then Pragma_Name (Item) in Configuration_Pragma_Names
3103 -- Loop through the actual context clause items. We process everything
3104 -- except Limited_With clauses in this routine. Limited_With clauses
3105 -- are separately installed (see Install_Limited_Context_Clauses).
3107 while Present (Item) loop
3109 -- Case of explicit WITH clause
3111 if Nkind (Item) = N_With_Clause
3112 and then not Implicit_With (Item)
3114 if Limited_Present (Item) then
3116 -- Limited withed units will be installed later
3120 -- If Name (Item) is not an entity name, something is wrong, and
3121 -- this will be detected in due course, for now ignore the item
3123 elsif not Is_Entity_Name (Name (Item)) then
3126 elsif No (Entity (Name (Item))) then
3127 Set_Entity (Name (Item), Any_Id);
3131 Uname_Node := Entity (Name (Item));
3133 if Is_Private_Descendant (Uname_Node) then
3134 Check_Private := True;
3137 Install_Withed_Unit (Item);
3139 Decl_Node := Unit_Declaration_Node (Uname_Node);
3141 -- If the unit is a subprogram instance, it appears nested within
3142 -- a package that carries the parent information.
3144 if Is_Generic_Instance (Uname_Node)
3145 and then Ekind (Uname_Node) /= E_Package
3147 Decl_Node := Parent (Parent (Decl_Node));
3150 if Is_Child_Spec (Decl_Node) then
3151 if Nkind (Name (Item)) = N_Expanded_Name then
3152 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3154 -- If not an expanded name, the child unit must be a
3155 -- renaming, nothing to do.
3160 elsif Nkind (Decl_Node) = N_Subprogram_Body
3161 and then not Acts_As_Spec (Parent (Decl_Node))
3162 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3164 Implicit_With_On_Parent
3165 (Unit (Library_Unit (Parent (Decl_Node))), N);
3168 -- Check license conditions unless this is a dummy unit
3170 if Sloc (Library_Unit (Item)) /= No_Location then
3171 License_Check : declare
3172 Withu : constant Unit_Number_Type :=
3173 Get_Source_Unit (Library_Unit (Item));
3174 Withl : constant License_Type :=
3175 License (Source_Index (Withu));
3176 Unitl : constant License_Type :=
3177 License (Source_Index (Current_Sem_Unit));
3179 procedure License_Error;
3180 -- Signal error of bad license
3186 procedure License_Error is
3189 ("?license of with'ed unit & may be inconsistent",
3193 -- Start of processing for License_Check
3196 -- Exclude license check if withed unit is an internal unit.
3197 -- This situation arises e.g. with the GPL version of GNAT.
3199 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3202 -- Otherwise check various cases
3214 if Withl = Restricted then
3218 when Modified_GPL =>
3219 if Withl = Restricted or else Withl = GPL then
3223 when Unrestricted =>
3230 -- Case of USE PACKAGE clause
3232 elsif Nkind (Item) = N_Use_Package_Clause then
3233 Analyze_Use_Package (Item);
3235 -- Case of USE TYPE clause
3237 elsif Nkind (Item) = N_Use_Type_Clause then
3238 Analyze_Use_Type (Item);
3242 elsif Nkind (Item) = N_Pragma then
3250 if Is_Child_Spec (Lib_Unit) then
3252 -- The unit also has implicit with_clauses on its own parents
3254 if No (Context_Items (N)) then
3255 Set_Context_Items (N, New_List);
3258 Implicit_With_On_Parent (Lib_Unit, N);
3261 -- If the unit is a body, the context of the specification must also
3262 -- be installed. That includes private with_clauses in that context.
3264 if Nkind (Lib_Unit) = N_Package_Body
3265 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3266 and then not Acts_As_Spec (N))
3268 Install_Context (Library_Unit (N));
3270 -- Only install private with-clauses of a spec that comes from
3271 -- source, excluding specs created for a subprogram body that is
3274 if Comes_From_Source (Library_Unit (N)) then
3275 Install_Private_With_Clauses
3276 (Defining_Entity (Unit (Library_Unit (N))));
3279 if Is_Child_Spec (Unit (Library_Unit (N))) then
3281 -- If the unit is the body of a public child unit, the private
3282 -- declarations of the parent must be made visible. If the child
3283 -- unit is private, the private declarations have been installed
3284 -- already in the call to Install_Parents for the spec. Installing
3285 -- private declarations must be done for all ancestors of public
3286 -- child units. In addition, sibling units mentioned in the
3287 -- context clause of the body are directly visible.
3295 Lib_Spec := Unit (Library_Unit (N));
3296 while Is_Child_Spec (Lib_Spec) loop
3297 P := Unit (Parent_Spec (Lib_Spec));
3298 P_Name := Defining_Entity (P);
3300 if not (Private_Present (Parent (Lib_Spec)))
3301 and then not In_Private_Part (P_Name)
3303 Install_Private_Declarations (P_Name);
3304 Install_Private_With_Clauses (P_Name);
3305 Set_Use (Private_Declarations (Specification (P)));
3313 -- For a package body, children in context are immediately visible
3315 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3318 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3319 N_Generic_Subprogram_Declaration,
3320 N_Package_Declaration,
3321 N_Subprogram_Declaration)
3323 if Is_Child_Spec (Lib_Unit) then
3324 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3325 Set_Is_Private_Descendant
3326 (Defining_Entity (Lib_Unit),
3327 Is_Private_Descendant (Lib_Parent)
3328 or else Private_Present (Parent (Lib_Unit)));
3331 Set_Is_Private_Descendant
3332 (Defining_Entity (Lib_Unit),
3333 Private_Present (Parent (Lib_Unit)));
3337 if Check_Private then
3338 Check_Private_Child_Unit (N);
3340 end Install_Context_Clauses;
3342 -------------------------------------
3343 -- Install_Limited_Context_Clauses --
3344 -------------------------------------
3346 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3349 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3350 -- Check that the unlimited view of a given compilation_unit is not
3351 -- already visible through "use + renamings".
3353 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3354 -- Check that if a limited_with clause of a given compilation_unit
3355 -- mentions a descendant of a private child of some library unit, then
3356 -- the given compilation_unit shall be the declaration of a private
3357 -- descendant of that library unit, or a public descendant of such. The
3358 -- code is analogous to that of Check_Private_Child_Unit but we cannot
3359 -- use entities on the limited with_clauses because their units have not
3360 -- been analyzed, so we have to climb the tree of ancestors looking for
3361 -- private keywords.
3363 procedure Expand_Limited_With_Clause
3364 (Comp_Unit : Node_Id;
3367 -- If a child unit appears in a limited_with clause, there are implicit
3368 -- limited_with clauses on all parents that are not already visible
3369 -- through a regular with clause. This procedure creates the implicit
3370 -- limited with_clauses for the parents and loads the corresponding
3371 -- units. The shadow entities are created when the inserted clause is
3372 -- analyzed. Implements Ada 2005 (AI-50217).
3374 ---------------------
3375 -- Check_Renamings --
3376 ---------------------
3378 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3387 pragma Assert (Nkind (W) = N_With_Clause);
3389 -- Protect the frontend against previous critical errors
3391 case Nkind (Unit (Library_Unit (W))) is
3392 when N_Subprogram_Declaration |
3393 N_Package_Declaration |
3394 N_Generic_Subprogram_Declaration |
3395 N_Generic_Package_Declaration =>
3402 -- Check "use + renamings"
3404 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3405 Spec := Specification (Unit (P));
3407 Item := First (Visible_Declarations (Spec));
3408 while Present (Item) loop
3410 -- Look only at use package clauses
3412 if Nkind (Item) = N_Use_Package_Clause then
3414 -- Traverse the list of packages
3416 Nam := First (Names (Item));
3417 while Present (Nam) loop
3420 pragma Assert (Present (Parent (E)));
3422 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3423 and then Renamed_Entity (E) = WEnt
3425 -- The unlimited view is visible through use clause and
3426 -- renamings. There is no need to generate the error
3427 -- message here because Is_Visible_Through_Renamings
3428 -- takes care of generating the precise error message.
3432 elsif Nkind (Parent (E)) = N_Package_Specification then
3434 -- The use clause may refer to a local package.
3435 -- Check all the enclosing scopes.
3438 while E2 /= Standard_Standard
3446 ("unlimited view visible through use clause ", W);
3458 -- Recursive call to check all the ancestors
3460 if Is_Child_Spec (Unit (P)) then
3461 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3463 end Check_Renamings;
3465 ---------------------------------------
3466 -- Check_Private_Limited_Withed_Unit --
3467 ---------------------------------------
3469 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3470 Curr_Parent : Node_Id;
3471 Child_Parent : Node_Id;
3472 Curr_Private : Boolean;
3475 -- Compilation unit of the parent of the withed library unit
3477 Child_Parent := Library_Unit (Item);
3479 -- If the child unit is a public child, then locate its nearest
3480 -- private ancestor, if any, then Child_Parent will then be set to
3481 -- the parent of that ancestor.
3483 if not Private_Present (Library_Unit (Item)) then
3484 while Present (Child_Parent)
3485 and then not Private_Present (Child_Parent)
3487 Child_Parent := Parent_Spec (Unit (Child_Parent));
3490 if No (Child_Parent) then
3495 Child_Parent := Parent_Spec (Unit (Child_Parent));
3497 -- Traverse all the ancestors of the current compilation unit to
3498 -- check if it is a descendant of named library unit.
3500 Curr_Parent := Parent (Item);
3501 Curr_Private := Private_Present (Curr_Parent);
3503 while Present (Parent_Spec (Unit (Curr_Parent)))
3504 and then Curr_Parent /= Child_Parent
3506 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3507 Curr_Private := Curr_Private or else Private_Present (Curr_Parent);
3510 if Curr_Parent /= Child_Parent then
3512 ("unit in with clause is private child unit!", Item);
3514 ("\current unit must also have parent&!",
3515 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3517 elsif Private_Present (Parent (Item))
3518 or else Curr_Private
3519 or else Private_Present (Item)
3520 or else Nkind_In (Unit (Parent (Item)), N_Package_Body,
3524 -- Current unit is private, of descendant of a private unit
3530 ("current unit must also be private descendant of&",
3531 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3533 end Check_Private_Limited_Withed_Unit;
3535 --------------------------------
3536 -- Expand_Limited_With_Clause --
3537 --------------------------------
3539 procedure Expand_Limited_With_Clause
3540 (Comp_Unit : Node_Id;
3544 Loc : constant Source_Ptr := Sloc (Nam);
3545 Unum : Unit_Number_Type;
3548 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3549 -- Returns true if the context already includes a with_clause for
3550 -- this unit. If the with_clause is non-limited, the unit is fully
3551 -- visible and an implicit limited_with should not be created. If
3552 -- there is already a limited_with clause for W, a second one is
3553 -- simply redundant.
3555 --------------------------
3556 -- Previous_Withed_Unit --
3557 --------------------------
3559 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3563 -- A limited with_clause cannot appear in the same context_clause
3564 -- as a nonlimited with_clause which mentions the same library.
3566 Item := First (Context_Items (Comp_Unit));
3567 while Present (Item) loop
3568 if Nkind (Item) = N_With_Clause
3569 and then Library_Unit (Item) = Library_Unit (W)
3578 end Previous_Withed_Unit;
3580 -- Start of processing for Expand_Limited_With_Clause
3583 New_Nodes_OK := New_Nodes_OK + 1;
3585 if Nkind (Nam) = N_Identifier then
3587 -- Create node for name of withed unit
3590 Make_With_Clause (Loc,
3591 Name => New_Copy (Nam));
3593 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3595 Make_With_Clause (Loc,
3596 Name => Make_Selected_Component (Loc,
3597 Prefix => New_Copy_Tree (Prefix (Nam)),
3598 Selector_Name => New_Copy (Selector_Name (Nam))));
3599 Set_Parent (Withn, Parent (N));
3602 Set_Limited_Present (Withn);
3603 Set_First_Name (Withn);
3604 Set_Implicit_With (Withn);
3608 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3613 -- Do not generate a limited_with_clause on the current unit.
3614 -- This path is taken when a unit has a limited_with clause on
3615 -- one of its child units.
3617 if Unum = Current_Sem_Unit then
3621 Set_Library_Unit (Withn, Cunit (Unum));
3622 Set_Corresponding_Spec
3623 (Withn, Specification (Unit (Cunit (Unum))));
3625 if not Previous_Withed_Unit (Withn) then
3626 Prepend (Withn, Context_Items (Parent (N)));
3627 Mark_Rewrite_Insertion (Withn);
3629 -- Add implicit limited_with_clauses for parents of child units
3630 -- mentioned in limited_with clauses.
3632 if Nkind (Nam) = N_Selected_Component then
3633 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3638 if not Limited_View_Installed (Withn) then
3639 Install_Limited_Withed_Unit (Withn);
3643 New_Nodes_OK := New_Nodes_OK - 1;
3644 end Expand_Limited_With_Clause;
3646 -- Start of processing for Install_Limited_Context_Clauses
3649 Item := First (Context_Items (N));
3650 while Present (Item) loop
3651 if Nkind (Item) = N_With_Clause
3652 and then Limited_Present (Item)
3654 if Nkind (Name (Item)) = N_Selected_Component then
3655 Expand_Limited_With_Clause
3656 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3659 Check_Private_Limited_Withed_Unit (Item);
3661 if not Implicit_With (Item)
3662 and then Is_Child_Spec (Unit (N))
3664 Check_Renamings (Parent_Spec (Unit (N)), Item);
3667 -- A unit may have a limited with on itself if it has a limited
3668 -- with_clause on one of its child units. In that case it is
3669 -- already being compiled and it makes no sense to install its
3672 -- If the item is a limited_private_with_clause, install it if the
3673 -- current unit is a body or if it is a private child. Otherwise
3674 -- the private clause is installed before analyzing the private
3675 -- part of the current unit.
3677 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3678 and then not Limited_View_Installed (Item)
3680 if not Private_Present (Item)
3681 or else Private_Present (N)
3682 or else Nkind_In (Unit (N), N_Package_Body,
3686 Install_Limited_Withed_Unit (Item);
3694 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3695 -- spec, looking for incomplete subtype declarations of incomplete types
3696 -- visible through a limited with clause.
3698 if Ada_Version >= Ada_05
3699 and then Analyzed (N)
3700 and then Nkind (Unit (N)) = N_Package_Declaration
3705 Non_Lim_View : Entity_Id;
3708 Decl := First (Visible_Declarations (Specification (Unit (N))));
3709 while Present (Decl) loop
3710 if Nkind (Decl) = N_Subtype_Declaration
3712 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3714 From_With_Type (Defining_Identifier (Decl))
3716 Def_Id := Defining_Identifier (Decl);
3717 Non_Lim_View := Non_Limited_View (Def_Id);
3719 if not Is_Incomplete_Type (Non_Lim_View) then
3721 -- Convert an incomplete subtype declaration into a
3722 -- corresponding non-limited view subtype declaration.
3723 -- This is usually the case when analyzing a body that
3724 -- has regular with-clauses, when the spec has limited
3727 -- If the non-limited view is still incomplete, it is
3728 -- the dummy entry already created, and the declaration
3729 -- cannot be reanalyzed. This is the case when installing
3730 -- a parent unit that has limited with-clauses.
3732 Set_Subtype_Indication (Decl,
3733 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3734 Set_Etype (Def_Id, Non_Lim_View);
3735 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3736 Set_Analyzed (Decl, False);
3738 -- Reanalyze the declaration, suppressing the call to
3739 -- Enter_Name to avoid duplicate names.
3741 Analyze_Subtype_Declaration
3751 end Install_Limited_Context_Clauses;
3753 ---------------------
3754 -- Install_Parents --
3755 ---------------------
3757 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3764 P := Unit (Parent_Spec (Lib_Unit));
3765 P_Name := Get_Parent_Entity (P);
3767 if Etype (P_Name) = Any_Type then
3771 if Ekind (P_Name) = E_Generic_Package
3772 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3773 N_Generic_Package_Declaration)
3774 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3777 ("child of a generic package must be a generic unit", Lib_Unit);
3779 elsif not Is_Package_Or_Generic_Package (P_Name) then
3781 ("parent unit must be package or generic package", Lib_Unit);
3782 raise Unrecoverable_Error;
3784 elsif Present (Renamed_Object (P_Name)) then
3785 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3786 raise Unrecoverable_Error;
3788 -- Verify that a child of an instance is itself an instance, or the
3789 -- renaming of one. Given that an instance that is a unit is replaced
3790 -- with a package declaration, check against the original node. The
3791 -- parent may be currently being instantiated, in which case it appears
3792 -- as a declaration, but the generic_parent is already established
3793 -- indicating that we deal with an instance.
3795 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3796 if Nkind (Lib_Unit) in N_Renaming_Declaration
3797 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3799 (Nkind (Lib_Unit) = N_Package_Declaration
3800 and then Present (Generic_Parent (Specification (Lib_Unit))))
3805 ("child of an instance must be an instance or renaming",
3810 -- This is the recursive call that ensures all parents are loaded
3812 if Is_Child_Spec (P) then
3814 Is_Private or else Private_Present (Parent (Lib_Unit)));
3817 -- Now we can install the context for this parent
3819 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3820 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3821 Install_Siblings (P_Name, Parent (Lib_Unit));
3823 -- The child unit is in the declarative region of the parent. The parent
3824 -- must therefore appear in the scope stack and be visible, as when
3825 -- compiling the corresponding body. If the child unit is private or it
3826 -- is a package body, private declarations must be accessible as well.
3827 -- Use declarations in the parent must also be installed. Finally, other
3828 -- child units of the same parent that are in the context are
3829 -- immediately visible.
3831 -- Find entity for compilation unit, and set its private descendant
3832 -- status as needed. Indicate that it is a compilation unit, which is
3833 -- redundant in general, but needed if this is a generated child spec
3834 -- for a child body without previous spec.
3836 E_Name := Defining_Entity (Lib_Unit);
3838 Set_Is_Child_Unit (E_Name);
3839 Set_Is_Compilation_Unit (E_Name);
3841 Set_Is_Private_Descendant (E_Name,
3842 Is_Private_Descendant (P_Name)
3843 or else Private_Present (Parent (Lib_Unit)));
3845 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3846 Push_Scope (P_Name);
3848 -- Save current visibility of unit
3850 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3851 Is_Immediately_Visible (P_Name);
3852 Set_Is_Immediately_Visible (P_Name);
3853 Install_Visible_Declarations (P_Name);
3854 Set_Use (Visible_Declarations (P_Spec));
3856 -- If the parent is a generic unit, its formal part may contain formal
3857 -- packages and use clauses for them.
3859 if Ekind (P_Name) = E_Generic_Package then
3860 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3864 or else Private_Present (Parent (Lib_Unit))
3866 Install_Private_Declarations (P_Name);
3867 Install_Private_With_Clauses (P_Name);
3868 Set_Use (Private_Declarations (P_Spec));
3870 end Install_Parents;
3872 ----------------------------------
3873 -- Install_Private_With_Clauses --
3874 ----------------------------------
3876 procedure Install_Private_With_Clauses (P : Entity_Id) is
3877 Decl : constant Node_Id := Unit_Declaration_Node (P);
3881 if Debug_Flag_I then
3882 Write_Str ("install private with clauses of ");
3883 Write_Name (Chars (P));
3887 if Nkind (Parent (Decl)) = N_Compilation_Unit then
3888 Item := First (Context_Items (Parent (Decl)));
3889 while Present (Item) loop
3890 if Nkind (Item) = N_With_Clause
3891 and then Private_Present (Item)
3893 if Limited_Present (Item) then
3894 if not Limited_View_Installed (Item) then
3895 Install_Limited_Withed_Unit (Item);
3898 Install_Withed_Unit (Item, Private_With_OK => True);
3905 end Install_Private_With_Clauses;
3907 ----------------------
3908 -- Install_Siblings --
3909 ----------------------
3911 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
3917 -- Iterate over explicit with clauses, and check whether the scope of
3918 -- each entity is an ancestor of the current unit, in which case it is
3919 -- immediately visible.
3921 Item := First (Context_Items (N));
3922 while Present (Item) loop
3924 -- Do not install private_with_clauses declaration, unless unit
3925 -- is itself a private child unit, or is a body. Note that for a
3926 -- subprogram body the private_with_clause does not take effect until
3927 -- after the specification.
3929 if Nkind (Item) /= N_With_Clause
3930 or else Implicit_With (Item)
3931 or else Limited_Present (Item)
3935 elsif not Private_Present (Item)
3936 or else Private_Present (N)
3937 or else Nkind (Unit (N)) = N_Package_Body
3939 Id := Entity (Name (Item));
3941 if Is_Child_Unit (Id)
3942 and then Is_Ancestor_Package (Scope (Id), U_Name)
3944 Set_Is_Immediately_Visible (Id);
3946 -- Check for the presence of another unit in the context that
3947 -- may be inadvertently hidden by the child.
3949 Prev := Current_Entity (Id);
3952 and then Is_Immediately_Visible (Prev)
3953 and then not Is_Child_Unit (Prev)
3959 Clause := First (Context_Items (N));
3960 while Present (Clause) loop
3961 if Nkind (Clause) = N_With_Clause
3962 and then Entity (Name (Clause)) = Prev
3965 ("child unit& hides compilation unit " &
3966 "with the same name?",
3976 -- The With_Clause may be on a grand-child or one of its further
3977 -- descendants, which makes a child immediately visible. Examine
3978 -- ancestry to determine whether such a child exists. For example,
3979 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
3980 -- is immediately visible.
3982 elsif Is_Child_Unit (Id) then
3988 while Is_Child_Unit (Par) loop
3989 if Is_Ancestor_Package (Scope (Par), U_Name) then
3990 Set_Is_Immediately_Visible (Par);
3999 -- If the item is a private with-clause on a child unit, the parent
4000 -- may have been installed already, but the child unit must remain
4001 -- invisible until installed in a private part or body.
4003 elsif Private_Present (Item) then
4004 Id := Entity (Name (Item));
4006 if Is_Child_Unit (Id) then
4007 Set_Is_Visible_Child_Unit (Id, False);
4013 end Install_Siblings;
4015 ---------------------------------
4016 -- Install_Limited_Withed_Unit --
4017 ---------------------------------
4019 procedure Install_Limited_Withed_Unit (N : Node_Id) is
4020 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
4023 Is_Child_Package : Boolean := False;
4024 Lim_Header : Entity_Id;
4025 Lim_Typ : Entity_Id;
4027 procedure Check_Body_Required;
4028 -- A unit mentioned in a limited with_clause may not be mentioned in
4029 -- a regular with_clause, but must still be included in the current
4030 -- partition. We need to determine whether the unit needs a body, so
4031 -- that the binder can determine the name of the file to be compiled.
4032 -- Checking whether a unit needs a body can be done without semantic
4033 -- analysis, by examining the nature of the declarations in the package.
4035 function Has_Limited_With_Clause
4036 (C_Unit : Entity_Id;
4037 Pack : Entity_Id) return Boolean;
4038 -- Determine whether any package in the ancestor chain starting with
4039 -- C_Unit has a limited with clause for package Pack.
4041 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
4042 -- Check if some package installed though normal with-clauses has a
4043 -- renaming declaration of package P. AARM 10.1.2(21/2).
4045 -------------------------
4046 -- Check_Body_Required --
4047 -------------------------
4049 procedure Check_Body_Required is
4050 PA : constant List_Id :=
4051 Pragmas_After (Aux_Decls_Node (Parent (P_Unit)));
4053 procedure Check_Declarations (Spec : Node_Id);
4054 -- Recursive procedure that does the work and checks nested packages
4056 ------------------------
4057 -- Check_Declarations --
4058 ------------------------
4060 procedure Check_Declarations (Spec : Node_Id) is
4062 Incomplete_Decls : constant Elist_Id := New_Elmt_List;
4064 Subp_List : constant Elist_Id := New_Elmt_List;
4066 procedure Check_Pragma_Import (P : Node_Id);
4067 -- If a pragma import applies to a previous subprogram, the
4068 -- enclosing unit may not need a body. The processing is syntactic
4069 -- and does not require a declaration to be analyzed. The code
4070 -- below also handles pragma Import when applied to a subprogram
4071 -- that renames another. In this case the pragma applies to the
4074 -- Chains of multiple renames are not handled by the code below.
4075 -- It is probably impossible to handle all cases without proper
4076 -- name resolution. In such cases the algorithm is conservative
4077 -- and will indicate that a body is needed???
4079 -------------------------
4080 -- Check_Pragma_Import --
4081 -------------------------
4083 procedure Check_Pragma_Import (P : Node_Id) is
4089 procedure Remove_Homonyms (E : Node_Id);
4090 -- Make one pass over list of subprograms. Called again if
4091 -- subprogram is a renaming. E is known to be an identifier.
4093 ---------------------
4094 -- Remove_Homonyms --
4095 ---------------------
4097 procedure Remove_Homonyms (E : Node_Id) is
4098 R : Entity_Id := Empty;
4099 -- Name of renamed entity, if any
4102 Subp_Id := First_Elmt (Subp_List);
4103 while Present (Subp_Id) loop
4104 if Chars (Node (Subp_Id)) = Chars (E) then
4105 if Nkind (Parent (Parent (Node (Subp_Id))))
4106 /= N_Subprogram_Renaming_Declaration
4109 Next_Elmt (Subp_Id);
4110 Remove_Elmt (Subp_List, Prev_Id);
4112 R := Name (Parent (Parent (Node (Subp_Id))));
4116 Next_Elmt (Subp_Id);
4121 if Nkind (R) = N_Identifier then
4122 Remove_Homonyms (R);
4124 elsif Nkind (R) = N_Selected_Component then
4125 Remove_Homonyms (Selector_Name (R));
4127 -- Renaming of attribute
4133 end Remove_Homonyms;
4135 -- Start of processing for Check_Pragma_Import
4138 -- Find name of entity in Import pragma. We have not analyzed
4139 -- the construct, so we must guard against syntax errors.
4141 Arg := Next (First (Pragma_Argument_Associations (P)));
4144 or else Nkind (Expression (Arg)) /= N_Identifier
4148 Imported := Expression (Arg);
4151 Remove_Homonyms (Imported);
4152 end Check_Pragma_Import;
4154 -- Start of processing for Check_Declarations
4157 -- Search for Elaborate Body pragma
4159 Decl := First (Visible_Declarations (Spec));
4160 while Present (Decl)
4161 and then Nkind (Decl) = N_Pragma
4163 if Get_Pragma_Id (Decl) = Pragma_Elaborate_Body then
4164 Set_Body_Required (Library_Unit (N));
4171 -- Look for declarations that require the presence of a body. We
4172 -- have already skipped pragmas at the start of the list.
4174 while Present (Decl) loop
4176 -- Subprogram that comes from source means body may be needed.
4177 -- Save for subsequent examination of import pragmas.
4179 if Comes_From_Source (Decl)
4180 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4181 N_Subprogram_Renaming_Declaration,
4182 N_Generic_Subprogram_Declaration))
4184 Append_Elmt (Defining_Entity (Decl), Subp_List);
4186 -- Package declaration of generic package declaration. We need
4187 -- to recursively examine nested declarations.
4189 elsif Nkind_In (Decl, N_Package_Declaration,
4190 N_Generic_Package_Declaration)
4192 Check_Declarations (Specification (Decl));
4194 elsif Nkind (Decl) = N_Pragma
4195 and then Pragma_Name (Decl) = Name_Import
4197 Check_Pragma_Import (Decl);
4203 -- Same set of tests for private part. In addition to subprograms
4204 -- detect the presence of Taft Amendment types (incomplete types
4205 -- completed in the body).
4207 Decl := First (Private_Declarations (Spec));
4208 while Present (Decl) loop
4209 if Comes_From_Source (Decl)
4210 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4211 N_Subprogram_Renaming_Declaration,
4212 N_Generic_Subprogram_Declaration))
4214 Append_Elmt (Defining_Entity (Decl), Subp_List);
4216 elsif Nkind_In (Decl, N_Package_Declaration,
4217 N_Generic_Package_Declaration)
4219 Check_Declarations (Specification (Decl));
4221 -- Collect incomplete type declarations for separate pass
4223 elsif Nkind (Decl) = N_Incomplete_Type_Declaration then
4224 Append_Elmt (Decl, Incomplete_Decls);
4226 elsif Nkind (Decl) = N_Pragma
4227 and then Pragma_Name (Decl) = Name_Import
4229 Check_Pragma_Import (Decl);
4235 -- Now check incomplete declarations to locate Taft amendment
4236 -- types. This can be done by examining the defining identifiers
4237 -- of type declarations without real semantic analysis.
4243 Inc := First_Elmt (Incomplete_Decls);
4244 while Present (Inc) loop
4245 Decl := Next (Node (Inc));
4246 while Present (Decl) loop
4247 if Nkind (Decl) = N_Full_Type_Declaration
4248 and then Chars (Defining_Identifier (Decl)) =
4249 Chars (Defining_Identifier (Node (Inc)))
4257 -- If no completion, this is a TAT, and a body is needed
4260 Set_Body_Required (Library_Unit (N));
4268 -- Finally, check whether there are subprograms that still
4269 -- require a body, i.e. are not renamings or null.
4271 if not Is_Empty_Elmt_List (Subp_List) then
4277 Subp_Id := First_Elmt (Subp_List);
4278 Spec := Parent (Node (Subp_Id));
4280 while Present (Subp_Id) loop
4281 if Nkind (Parent (Spec))
4282 = N_Subprogram_Renaming_Declaration
4286 elsif Nkind (Spec) = N_Procedure_Specification
4287 and then Null_Present (Spec)
4292 Set_Body_Required (Library_Unit (N));
4296 Next_Elmt (Subp_Id);
4300 end Check_Declarations;
4302 -- Start of processing for Check_Body_Required
4305 -- If this is an imported package (Java and CIL usage) no body is
4306 -- needed. Scan list of pragmas that may follow a compilation unit
4307 -- to look for a relevant pragma Import.
4309 if Present (PA) then
4315 while Present (Prag) loop
4316 if Nkind (Prag) = N_Pragma
4317 and then Get_Pragma_Id (Prag) = Pragma_Import
4327 Check_Declarations (Specification (P_Unit));
4328 end Check_Body_Required;
4330 -----------------------------
4331 -- Has_Limited_With_Clause --
4332 -----------------------------
4334 function Has_Limited_With_Clause
4335 (C_Unit : Entity_Id;
4336 Pack : Entity_Id) return Boolean
4343 while Present (Par) loop
4344 if Ekind (Par) /= E_Package then
4348 -- Retrieve the Compilation_Unit node for Par and determine if
4349 -- its context clauses contain a limited with for Pack.
4351 Par_Unit := Parent (Parent (Parent (Par)));
4353 if Nkind (Par_Unit) = N_Package_Declaration then
4354 Par_Unit := Parent (Par_Unit);
4357 if Has_With_Clause (Par_Unit, Pack, True) then
4361 -- If there are more ancestors, climb up the tree, otherwise
4364 if Is_Child_Unit (Par) then
4372 end Has_Limited_With_Clause;
4374 ----------------------------------
4375 -- Is_Visible_Through_Renamings --
4376 ----------------------------------
4378 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4379 Kind : constant Node_Kind :=
4380 Nkind (Unit (Cunit (Current_Sem_Unit)));
4386 -- Example of the error detected by this subprogram:
4394 -- package Ren_P renames P;
4400 -- limited with P; -- ERROR
4401 -- package R.C is ...
4403 Aux_Unit := Cunit (Current_Sem_Unit);
4406 Item := First (Context_Items (Aux_Unit));
4407 while Present (Item) loop
4408 if Nkind (Item) = N_With_Clause
4409 and then not Limited_Present (Item)
4410 and then Nkind (Unit (Library_Unit (Item))) =
4411 N_Package_Declaration
4414 First (Visible_Declarations
4415 (Specification (Unit (Library_Unit (Item)))));
4416 while Present (Decl) loop
4417 if Nkind (Decl) = N_Package_Renaming_Declaration
4418 and then Entity (Name (Decl)) = P
4420 -- Generate the error message only if the current unit
4421 -- is a package declaration; in case of subprogram
4422 -- bodies and package bodies we just return True to
4423 -- indicate that the limited view must not be
4426 if Kind = N_Package_Declaration then
4428 ("simultaneous visibility of the limited and " &
4429 "unlimited views not allowed", N);
4430 Error_Msg_Sloc := Sloc (Item);
4432 ("\\ unlimited view of & visible through the " &
4433 "context clause #", N, P);
4434 Error_Msg_Sloc := Sloc (Decl);
4435 Error_Msg_NE ("\\ and the renaming #", N, P);
4448 -- If it is a body not acting as spec, follow pointer to the
4449 -- corresponding spec, otherwise follow pointer to parent spec.
4451 if Present (Library_Unit (Aux_Unit))
4452 and then Nkind_In (Unit (Aux_Unit),
4453 N_Package_Body, N_Subprogram_Body)
4455 if Aux_Unit = Library_Unit (Aux_Unit) then
4457 -- Aux_Unit is a body that acts as a spec. Clause has
4458 -- already been flagged as illegal.
4463 Aux_Unit := Library_Unit (Aux_Unit);
4467 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4470 exit when No (Aux_Unit);
4474 end Is_Visible_Through_Renamings;
4476 -- Start of processing for Install_Limited_Withed_Unit
4479 pragma Assert (not Limited_View_Installed (N));
4481 -- In case of limited with_clause on subprograms, generics, instances,
4482 -- or renamings, the corresponding error was previously posted and we
4483 -- have nothing to do here. If the file is missing altogether, it has
4484 -- no source location.
4486 if Nkind (P_Unit) /= N_Package_Declaration
4487 or else Sloc (P_Unit) = No_Location
4492 P := Defining_Unit_Name (Specification (P_Unit));
4494 -- Handle child packages
4496 if Nkind (P) = N_Defining_Program_Unit_Name then
4497 Is_Child_Package := True;
4498 P := Defining_Identifier (P);
4501 -- Do not install the limited-view if the context of the unit is already
4502 -- available through a regular with clause.
4504 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4505 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4510 -- Do not install the limited-view if the full-view is already visible
4511 -- through renaming declarations.
4513 if Is_Visible_Through_Renamings (P) then
4517 -- Do not install the limited view if this is the unit being analyzed.
4518 -- This unusual case will happen when a unit has a limited_with clause
4519 -- on one of its children. The compilation of the child forces the
4520 -- load of the parent which tries to install the limited view of the
4521 -- child again. Installing the limited view must also be disabled
4522 -- when compiling the body of the child unit.
4524 if P = Cunit_Entity (Current_Sem_Unit)
4526 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4527 and then P = Main_Unit_Entity)
4532 -- This scenario is similar to the one above, the difference is that
4533 -- the compilation of sibling Par.Sib forces the load of parent Par
4534 -- which tries to install the limited view of Lim_Pack [1]. However
4535 -- Par.Sib has a with clause for Lim_Pack [2] in its body, and thus
4536 -- needs the non-limited views of all entities from Lim_Pack.
4538 -- limited with Lim_Pack; -- [1]
4539 -- package Par is ... package Lim_Pack is ...
4541 -- with Lim_Pack; -- [2]
4542 -- package Par.Sib is ... package body Par.Sib is ...
4544 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4545 -- Sem_Unit is the body of Par.Sib.
4547 if Ekind (P) = E_Package
4548 and then Ekind (Main_Unit_Entity) = E_Package
4549 and then Is_Child_Unit (Main_Unit_Entity)
4551 -- The body has a regular with clause
4553 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4554 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4556 -- One of the ancestors has a limited with clause
4558 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4559 N_Package_Specification
4560 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4565 -- A common use of the limited-with is to have a limited-with
4566 -- in the package spec, and a normal with in its package body.
4569 -- limited with X; -- [1]
4573 -- package body A is ...
4575 -- The compilation of A's body installs the context clauses found at [2]
4576 -- and then the context clauses of its specification (found at [1]). As
4577 -- a consequence, at [1] the specification of X has been analyzed and it
4578 -- is immediately visible. According to the semantics of limited-with
4579 -- context clauses we don't install the limited view because the full
4580 -- view of X supersedes its limited view.
4582 if Analyzed (P_Unit)
4584 (Is_Immediately_Visible (P)
4585 or else (Is_Child_Package and then Is_Visible_Child_Unit (P)))
4590 if Debug_Flag_I then
4591 Write_Str ("install limited view of ");
4592 Write_Name (Chars (P));
4596 -- If the unit has not been analyzed and the limited view has not been
4597 -- already installed then we install it.
4599 if not Analyzed (P_Unit) then
4600 if not In_Chain (P) then
4602 -- Minimum decoration
4604 Set_Ekind (P, E_Package);
4605 Set_Etype (P, Standard_Void_Type);
4606 Set_Scope (P, Standard_Standard);
4608 if Is_Child_Package then
4609 Set_Is_Child_Unit (P);
4610 Set_Is_Visible_Child_Unit (P);
4611 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4614 -- Place entity on visibility structure
4616 Set_Homonym (P, Current_Entity (P));
4617 Set_Current_Entity (P);
4619 if Debug_Flag_I then
4620 Write_Str (" (homonym) chain ");
4621 Write_Name (Chars (P));
4625 -- Install the incomplete view. The first element of the limited
4626 -- view is a header (an E_Package entity) used to reference the
4627 -- first shadow entity in the private part of the package.
4629 Lim_Header := Limited_View (P);
4630 Lim_Typ := First_Entity (Lim_Header);
4632 while Present (Lim_Typ)
4633 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4635 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4636 Set_Current_Entity (Lim_Typ);
4638 if Debug_Flag_I then
4639 Write_Str (" (homonym) chain ");
4640 Write_Name (Chars (Lim_Typ));
4644 Next_Entity (Lim_Typ);
4648 -- If the unit appears in a previous regular with_clause, the regular
4649 -- entities of the public part of the withed package must be replaced
4650 -- by the shadow ones.
4652 -- This code must be kept synchronized with the code that replaces the
4653 -- shadow entities by the real entities (see body of Remove_Limited
4654 -- With_Clause); otherwise the contents of the homonym chains are not
4658 -- Hide all the type entities of the public part of the package to
4659 -- avoid its usage. This is needed to cover all the subtype decla-
4660 -- rations because we do not remove them from the homonym chain.
4662 E := First_Entity (P);
4663 while Present (E) and then E /= First_Private_Entity (P) loop
4665 Set_Was_Hidden (E, Is_Hidden (E));
4672 -- Replace the real entities by the shadow entities of the limited
4673 -- view. The first element of the limited view is a header that is
4674 -- used to reference the first shadow entity in the private part
4675 -- of the package. Successive elements are the limited views of the
4676 -- type (including regular incomplete types) declared in the package.
4678 Lim_Header := Limited_View (P);
4680 Lim_Typ := First_Entity (Lim_Header);
4681 while Present (Lim_Typ)
4682 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4684 pragma Assert (not In_Chain (Lim_Typ));
4686 -- Do not unchain nested packages and child units
4688 if Ekind (Lim_Typ) /= E_Package
4689 and then not Is_Child_Unit (Lim_Typ)
4695 Prev := Current_Entity (Lim_Typ);
4698 -- Replace E in the homonyms list, so that the limited
4699 -- view becomes available.
4701 if E = Non_Limited_View (Lim_Typ) then
4702 Set_Homonym (Lim_Typ, Homonym (Prev));
4703 Set_Current_Entity (Lim_Typ);
4707 E := Homonym (Prev);
4709 -- E may have been removed when installing a
4710 -- previous limited_with_clause.
4714 exit when E = Non_Limited_View (Lim_Typ);
4716 Prev := Homonym (Prev);
4720 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4721 Set_Homonym (Prev, Lim_Typ);
4726 if Debug_Flag_I then
4727 Write_Str (" (homonym) chain ");
4728 Write_Name (Chars (Lim_Typ));
4733 Next_Entity (Lim_Typ);
4737 -- The package must be visible while the limited-with clause is active
4738 -- because references to the type P.T must resolve in the usual way.
4739 -- In addition, we remember that the limited-view has been installed to
4740 -- uninstall it at the point of context removal.
4742 Set_Is_Immediately_Visible (P);
4743 Set_Limited_View_Installed (N);
4745 -- If unit has not been analyzed in some previous context, check
4746 -- (imperfectly ???) whether it might need a body.
4748 if not Analyzed (P_Unit) then
4749 Check_Body_Required;
4752 -- If the package in the limited_with clause is a child unit, the
4753 -- clause is unanalyzed and appears as a selected component. Recast
4754 -- it as an expanded name so that the entity can be properly set. Use
4755 -- entity of parent, if available, for higher ancestors in the name.
4757 if Nkind (Name (N)) = N_Selected_Component then
4765 while Nkind (Nam) = N_Selected_Component
4766 and then Present (Ent)
4768 Change_Selected_Component_To_Expanded_Name (Nam);
4770 -- Set entity of parent identifiers if the unit is a child
4771 -- unit. This ensures that the tree is properly formed from
4772 -- semantic point of view (e.g. for ASIS queries).
4774 Set_Entity (Nam, Ent);
4776 Nam := Prefix (Nam);
4779 -- Set entity of last ancestor
4781 if Nkind (Nam) = N_Identifier then
4782 Set_Entity (Nam, Ent);
4788 Set_Entity (Name (N), P);
4789 Set_From_With_Type (P);
4790 end Install_Limited_Withed_Unit;
4792 -------------------------
4793 -- Install_Withed_Unit --
4794 -------------------------
4796 procedure Install_Withed_Unit
4797 (With_Clause : Node_Id;
4798 Private_With_OK : Boolean := False)
4800 Uname : constant Entity_Id := Entity (Name (With_Clause));
4801 P : constant Entity_Id := Scope (Uname);
4804 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4805 -- compiling a package declaration and the Private_With_OK flag was not
4806 -- set by the caller. These declarations will be installed later (before
4807 -- analyzing the private part of the package).
4809 if Private_Present (With_Clause)
4810 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
4811 and then not (Private_With_OK)
4816 if Debug_Flag_I then
4817 if Private_Present (With_Clause) then
4818 Write_Str ("install private withed unit ");
4820 Write_Str ("install withed unit ");
4823 Write_Name (Chars (Uname));
4827 -- We do not apply the restrictions to an internal unit unless we are
4828 -- compiling the internal unit as a main unit. This check is also
4829 -- skipped for dummy units (for missing packages).
4831 if Sloc (Uname) /= No_Location
4832 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
4833 or else Current_Sem_Unit = Main_Unit)
4835 Check_Restricted_Unit
4836 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
4839 if P /= Standard_Standard then
4841 -- If the unit is not analyzed after analysis of the with clause and
4842 -- it is an instantiation then it awaits a body and is the main unit.
4843 -- Its appearance in the context of some other unit indicates a
4844 -- circular dependency (DEC suite perversity).
4846 if not Analyzed (Uname)
4847 and then Nkind (Parent (Uname)) = N_Package_Instantiation
4850 ("instantiation depends on itself", Name (With_Clause));
4852 elsif not Is_Visible_Child_Unit (Uname) then
4853 Set_Is_Visible_Child_Unit (Uname);
4855 -- If the child unit appears in the context of its parent, it is
4856 -- immediately visible.
4858 if In_Open_Scopes (Scope (Uname)) then
4859 Set_Is_Immediately_Visible (Uname);
4862 if Is_Generic_Instance (Uname)
4863 and then Ekind (Uname) in Subprogram_Kind
4865 -- Set flag as well on the visible entity that denotes the
4866 -- instance, which renames the current one.
4868 Set_Is_Visible_Child_Unit
4870 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
4873 -- The parent unit may have been installed already, and may have
4874 -- appeared in a use clause.
4876 if In_Use (Scope (Uname)) then
4877 Set_Is_Potentially_Use_Visible (Uname);
4880 Set_Context_Installed (With_Clause);
4883 elsif not Is_Immediately_Visible (Uname) then
4884 if not Private_Present (With_Clause)
4885 or else Private_With_OK
4887 Set_Is_Immediately_Visible (Uname);
4890 Set_Context_Installed (With_Clause);
4893 -- A with-clause overrides a with-type clause: there are no restric-
4894 -- tions on the use of package entities.
4896 if Ekind (Uname) = E_Package then
4897 Set_From_With_Type (Uname, False);
4900 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4901 -- unit if there is a visible homograph for it declared in the same
4902 -- declarative region. This pathological case can only arise when an
4903 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4904 -- G1 has a generic child also named G2, and the context includes with_
4905 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4906 -- of I1.G2 visible as well. If the child unit is named Standard, do
4907 -- not apply the check to the Standard package itself.
4909 if Is_Child_Unit (Uname)
4910 and then Is_Visible_Child_Unit (Uname)
4911 and then Ada_Version >= Ada_05
4914 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
4920 U2 := Homonym (Uname);
4922 and then U2 /= Standard_Standard
4925 Decl2 := Unit_Declaration_Node (P2);
4927 if Is_Child_Unit (U2)
4928 and then Is_Visible_Child_Unit (U2)
4930 if Is_Generic_Instance (P)
4931 and then Nkind (Decl1) = N_Package_Declaration
4932 and then Generic_Parent (Specification (Decl1)) = P2
4934 Error_Msg_N ("illegal with_clause", With_Clause);
4936 ("\child unit has visible homograph" &
4937 " (RM 8.3(26), 10.1.1(19))",
4941 elsif Is_Generic_Instance (P2)
4942 and then Nkind (Decl2) = N_Package_Declaration
4943 and then Generic_Parent (Specification (Decl2)) = P
4945 -- With_clause for child unit of instance appears before
4946 -- in the context. We want to place the error message on
4947 -- it, not on the generic child unit itself.
4950 Prev_Clause : Node_Id;
4953 Prev_Clause := First (List_Containing (With_Clause));
4954 while Entity (Name (Prev_Clause)) /= U2 loop
4958 pragma Assert (Present (Prev_Clause));
4959 Error_Msg_N ("illegal with_clause", Prev_Clause);
4961 ("\child unit has visible homograph" &
4962 " (RM 8.3(26), 10.1.1(19))",
4973 end Install_Withed_Unit;
4979 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
4980 K : constant Node_Kind := Nkind (Lib_Unit);
4983 return (K in N_Generic_Declaration or else
4984 K in N_Generic_Instantiation or else
4985 K in N_Generic_Renaming_Declaration or else
4986 K = N_Package_Declaration or else
4987 K = N_Package_Renaming_Declaration or else
4988 K = N_Subprogram_Declaration or else
4989 K = N_Subprogram_Renaming_Declaration)
4990 and then Present (Parent_Spec (Lib_Unit));
4993 ------------------------------------
4994 -- Is_Legal_Shadow_Entity_In_Body --
4995 ------------------------------------
4997 function Is_Legal_Shadow_Entity_In_Body (T : Entity_Id) return Boolean is
4998 C_Unit : constant Node_Id := Cunit (Current_Sem_Unit);
5000 return Nkind (Unit (C_Unit)) = N_Package_Body
5003 (C_Unit, Cunit_Entity (Get_Source_Unit (Non_Limited_View (T))));
5004 end Is_Legal_Shadow_Entity_In_Body;
5006 -----------------------
5007 -- Load_Needed_Body --
5008 -----------------------
5010 -- N is a generic unit named in a with clause, or else it is a unit that
5011 -- contains a generic unit or an inlined function. In order to perform an
5012 -- instantiation, the body of the unit must be present. If the unit itself
5013 -- is generic, we assume that an instantiation follows, and load & analyze
5014 -- the body unconditionally. This forces analysis of the spec as well.
5016 -- If the unit is not generic, but contains a generic unit, it is loaded on
5017 -- demand, at the point of instantiation (see ch12).
5019 procedure Load_Needed_Body (N : Node_Id; OK : out Boolean) is
5020 Body_Name : Unit_Name_Type;
5021 Unum : Unit_Number_Type;
5023 Save_Style_Check : constant Boolean := Opt.Style_Check;
5024 -- The loading and analysis is done with style checks off
5027 if not GNAT_Mode then
5028 Style_Check := False;
5031 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
5034 (Load_Name => Body_Name,
5040 if Unum = No_Unit then
5044 Compiler_State := Analyzing; -- reset after load
5046 if not Fatal_Error (Unum) or else Try_Semantics then
5047 if Debug_Flag_L then
5048 Write_Str ("*** Loaded generic body");
5052 Semantics (Cunit (Unum));
5058 Style_Check := Save_Style_Check;
5059 end Load_Needed_Body;
5061 -------------------------
5062 -- Build_Limited_Views --
5063 -------------------------
5065 procedure Build_Limited_Views (N : Node_Id) is
5066 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
5067 P : constant Entity_Id := Cunit_Entity (Unum);
5069 Spec : Node_Id; -- To denote a package specification
5070 Lim_Typ : Entity_Id; -- To denote shadow entities
5071 Comp_Typ : Entity_Id; -- To denote real entities
5073 Lim_Header : Entity_Id; -- Package entity
5074 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
5075 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
5077 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id);
5078 -- Add attributes of an incomplete type to a shadow entity. The same
5079 -- attributes are placed on the real entity, so that gigi receives
5080 -- a consistent view.
5082 procedure Decorate_Package_Specification (P : Entity_Id);
5083 -- Add attributes of a package entity to the entity in a package
5086 procedure Decorate_Tagged_Type
5090 -- Set basic attributes of tagged type T, including its class_wide type.
5091 -- The parameters Loc, Scope are used to decorate the class_wide type.
5093 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id);
5094 -- Construct list of shadow entities and attach it to entity of
5095 -- package that is mentioned in a limited_with clause.
5097 function New_Internal_Shadow_Entity
5098 (Kind : Entity_Kind;
5099 Sloc_Value : Source_Ptr;
5100 Id_Char : Character) return Entity_Id;
5101 -- Build a new internal entity and append it to the list of shadow
5102 -- entities available through the limited-header
5108 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id) is
5109 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
5110 Is_Tagged : Boolean;
5115 while Present (Decl) loop
5117 -- For each library_package_declaration in the environment, there
5118 -- is an implicit declaration of a *limited view* of that library
5119 -- package. The limited view of a package contains:
5121 -- * For each nested package_declaration, a declaration of the
5122 -- limited view of that package, with the same defining-
5123 -- program-unit name.
5125 -- * For each type_declaration in the visible part, an incomplete
5126 -- type-declaration with the same defining_identifier, whose
5127 -- completion is the type_declaration. If the type_declaration
5128 -- is tagged, then the incomplete_type_declaration is tagged
5131 -- The partial view is tagged if the declaration has the
5132 -- explicit keyword, or else if it is a type extension, both
5133 -- of which can be ascertained syntactically.
5135 if Nkind (Decl) = N_Full_Type_Declaration then
5137 (Nkind (Type_Definition (Decl)) = N_Record_Definition
5138 and then Tagged_Present (Type_Definition (Decl)))
5140 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
5143 (Record_Extension_Part (Type_Definition (Decl))));
5145 Comp_Typ := Defining_Identifier (Decl);
5147 if not Analyzed_Unit then
5149 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5151 Decorate_Incomplete_Type (Comp_Typ, Scope);
5155 -- Create shadow entity for type
5158 New_Internal_Shadow_Entity
5159 (Kind => Ekind (Comp_Typ),
5160 Sloc_Value => Sloc (Comp_Typ),
5163 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5164 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5165 Set_From_With_Type (Lim_Typ);
5168 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5170 Decorate_Incomplete_Type (Lim_Typ, Scope);
5173 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5175 elsif Nkind_In (Decl, N_Private_Type_Declaration,
5176 N_Incomplete_Type_Declaration,
5177 N_Task_Type_Declaration,
5178 N_Protected_Type_Declaration)
5180 Comp_Typ := Defining_Identifier (Decl);
5183 Nkind_In (Decl, N_Private_Type_Declaration,
5184 N_Incomplete_Type_Declaration)
5185 and then Tagged_Present (Decl);
5187 if not Analyzed_Unit then
5189 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5191 Decorate_Incomplete_Type (Comp_Typ, Scope);
5196 New_Internal_Shadow_Entity
5197 (Kind => Ekind (Comp_Typ),
5198 Sloc_Value => Sloc (Comp_Typ),
5201 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5202 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5203 Set_From_With_Type (Lim_Typ);
5206 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5208 Decorate_Incomplete_Type (Lim_Typ, Scope);
5211 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5213 elsif Nkind (Decl) = N_Private_Extension_Declaration then
5214 Comp_Typ := Defining_Identifier (Decl);
5216 if not Analyzed_Unit then
5217 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5220 -- Create shadow entity for type
5223 New_Internal_Shadow_Entity
5224 (Kind => Ekind (Comp_Typ),
5225 Sloc_Value => Sloc (Comp_Typ),
5228 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5229 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5230 Set_From_With_Type (Lim_Typ);
5232 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5233 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5235 elsif Nkind (Decl) = N_Package_Declaration then
5240 Spec : constant Node_Id := Specification (Decl);
5243 Comp_Typ := Defining_Unit_Name (Spec);
5245 if not Analyzed (Cunit (Unum)) then
5246 Decorate_Package_Specification (Comp_Typ);
5247 Set_Scope (Comp_Typ, Scope);
5251 New_Internal_Shadow_Entity
5252 (Kind => Ekind (Comp_Typ),
5253 Sloc_Value => Sloc (Comp_Typ),
5256 Decorate_Package_Specification (Lim_Typ);
5257 Set_Scope (Lim_Typ, Scope);
5259 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5260 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5261 Set_From_With_Type (Lim_Typ);
5263 -- Note: The non_limited_view attribute is not used
5264 -- for local packages.
5268 First_Decl => First (Visible_Declarations (Spec)));
5276 ------------------------------
5277 -- Decorate_Incomplete_Type --
5278 ------------------------------
5280 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id) is
5282 Set_Ekind (E, E_Incomplete_Type);
5283 Set_Scope (E, Scop);
5285 Set_Is_First_Subtype (E, True);
5286 Set_Stored_Constraint (E, No_Elist);
5287 Set_Full_View (E, Empty);
5288 Init_Size_Align (E);
5289 end Decorate_Incomplete_Type;
5291 --------------------------
5292 -- Decorate_Tagged_Type --
5293 --------------------------
5295 procedure Decorate_Tagged_Type
5303 Decorate_Incomplete_Type (T, Scop);
5304 Set_Is_Tagged_Type (T);
5306 -- Build corresponding class_wide type, if not previously done
5308 -- Note: The class-wide entity is shared by the limited-view
5309 -- and the full-view.
5311 if No (Class_Wide_Type (T)) then
5312 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S'));
5314 -- Set parent to be the same as the parent of the tagged type.
5315 -- We need a parent field set, and it is supposed to point to
5316 -- the declaration of the type. The tagged type declaration
5317 -- essentially declares two separate types, the tagged type
5318 -- itself and the corresponding class-wide type, so it is
5319 -- reasonable for the parent fields to point to the declaration
5322 Set_Parent (CW, Parent (T));
5324 -- Set remaining fields of classwide type
5326 Set_Ekind (CW, E_Class_Wide_Type);
5328 Set_Scope (CW, Scop);
5329 Set_Is_Tagged_Type (CW);
5330 Set_Is_First_Subtype (CW, True);
5331 Init_Size_Align (CW);
5332 Set_Has_Unknown_Discriminants (CW, True);
5333 Set_Class_Wide_Type (CW, CW);
5334 Set_Equivalent_Type (CW, Empty);
5335 Set_From_With_Type (CW, From_With_Type (T));
5337 -- Link type to its class-wide type
5339 Set_Class_Wide_Type (T, CW);
5341 end Decorate_Tagged_Type;
5343 ------------------------------------
5344 -- Decorate_Package_Specification --
5345 ------------------------------------
5347 procedure Decorate_Package_Specification (P : Entity_Id) is
5349 -- Place only the most basic attributes
5351 Set_Ekind (P, E_Package);
5352 Set_Etype (P, Standard_Void_Type);
5353 end Decorate_Package_Specification;
5355 --------------------------------
5356 -- New_Internal_Shadow_Entity --
5357 --------------------------------
5359 function New_Internal_Shadow_Entity
5360 (Kind : Entity_Kind;
5361 Sloc_Value : Source_Ptr;
5362 Id_Char : Character) return Entity_Id
5364 E : constant Entity_Id :=
5365 Make_Defining_Identifier (Sloc_Value,
5366 Chars => New_Internal_Name (Id_Char));
5369 Set_Ekind (E, Kind);
5370 Set_Is_Internal (E, True);
5372 if Kind in Type_Kind then
5373 Init_Size_Align (E);
5376 Append_Entity (E, Lim_Header);
5379 end New_Internal_Shadow_Entity;
5381 -- Start of processing for Build_Limited_Views
5384 pragma Assert (Limited_Present (N));
5386 -- A library_item mentioned in a limited_with_clause is a package
5387 -- declaration, not a subprogram declaration, generic declaration,
5388 -- generic instantiation, or package renaming declaration.
5390 case Nkind (Unit (Library_Unit (N))) is
5391 when N_Package_Declaration =>
5394 when N_Subprogram_Declaration =>
5395 Error_Msg_N ("subprograms not allowed in "
5396 & "limited with_clauses", N);
5399 when N_Generic_Package_Declaration |
5400 N_Generic_Subprogram_Declaration =>
5401 Error_Msg_N ("generics not allowed in "
5402 & "limited with_clauses", N);
5405 when N_Generic_Instantiation =>
5406 Error_Msg_N ("generic instantiations not allowed in "
5407 & "limited with_clauses", N);
5410 when N_Generic_Renaming_Declaration =>
5411 Error_Msg_N ("generic renamings not allowed in "
5412 & "limited with_clauses", N);
5415 when N_Subprogram_Renaming_Declaration =>
5416 Error_Msg_N ("renamed subprograms not allowed in "
5417 & "limited with_clauses", N);
5420 when N_Package_Renaming_Declaration =>
5421 Error_Msg_N ("renamed packages not allowed in "
5422 & "limited with_clauses", N);
5426 raise Program_Error;
5429 -- Check if the chain is already built
5431 Spec := Specification (Unit (Library_Unit (N)));
5433 if Limited_View_Installed (Spec) then
5437 Set_Ekind (P, E_Package);
5439 -- Build the header of the limited_view
5442 Make_Defining_Identifier (Sloc (N),
5443 Chars => New_Internal_Name (Id_Char => 'Z'));
5444 Set_Ekind (Lim_Header, E_Package);
5445 Set_Is_Internal (Lim_Header);
5446 Set_Limited_View (P, Lim_Header);
5448 -- Create the auxiliary chain. All the shadow entities are appended to
5449 -- the list of entities of the limited-view header
5453 First_Decl => First (Visible_Declarations (Spec)));
5455 -- Save the last built shadow entity. It is needed later to set the
5456 -- reference to the first shadow entity in the private part
5458 Last_Pub_Lim_E := Last_Lim_E;
5460 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5461 -- Required to give support to limited-private-with clauses
5463 Build_Chain (Scope => P,
5464 First_Decl => First (Private_Declarations (Spec)));
5466 if Last_Pub_Lim_E /= Empty then
5467 Set_First_Private_Entity
5468 (Lim_Header, Next_Entity (Last_Pub_Lim_E));
5470 Set_First_Private_Entity
5471 (Lim_Header, First_Entity (P));
5474 Set_Limited_View_Installed (Spec);
5475 end Build_Limited_Views;
5477 -------------------------------
5478 -- Check_Body_Needed_For_SAL --
5479 -------------------------------
5481 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5483 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5484 -- Determine whether use of entity E might require the presence of its
5485 -- body. For a package this requires a recursive traversal of all nested
5488 ---------------------------
5489 -- Entity_Needed_For_SAL --
5490 ---------------------------
5492 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5496 if Is_Subprogram (E)
5497 and then Has_Pragma_Inline (E)
5501 elsif Ekind (E) = E_Generic_Function
5502 or else Ekind (E) = E_Generic_Procedure
5506 elsif Ekind (E) = E_Generic_Package
5508 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5509 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5513 elsif Ekind (E) = E_Package
5514 and then Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5515 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5517 Ent := First_Entity (E);
5518 while Present (Ent) loop
5519 if Entity_Needs_Body (Ent) then
5531 end Entity_Needs_Body;
5533 -- Start of processing for Check_Body_Needed_For_SAL
5536 if Ekind (Unit_Name) = E_Generic_Package
5537 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5538 N_Generic_Package_Declaration
5540 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5542 Set_Body_Needed_For_SAL (Unit_Name);
5544 elsif Ekind (Unit_Name) = E_Generic_Procedure
5546 Ekind (Unit_Name) = E_Generic_Function
5548 Set_Body_Needed_For_SAL (Unit_Name);
5550 elsif Is_Subprogram (Unit_Name)
5551 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5552 N_Subprogram_Declaration
5553 and then Has_Pragma_Inline (Unit_Name)
5555 Set_Body_Needed_For_SAL (Unit_Name);
5557 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5558 Check_Body_Needed_For_SAL
5559 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5561 elsif Ekind (Unit_Name) = E_Package
5562 and then Entity_Needs_Body (Unit_Name)
5564 Set_Body_Needed_For_SAL (Unit_Name);
5566 elsif Ekind (Unit_Name) = E_Package_Body
5567 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5569 Check_Body_Needed_For_SAL
5570 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5572 end Check_Body_Needed_For_SAL;
5574 --------------------
5575 -- Remove_Context --
5576 --------------------
5578 procedure Remove_Context (N : Node_Id) is
5579 Lib_Unit : constant Node_Id := Unit (N);
5582 -- If this is a child unit, first remove the parent units
5584 if Is_Child_Spec (Lib_Unit) then
5585 Remove_Parents (Lib_Unit);
5588 Remove_Context_Clauses (N);
5591 ----------------------------
5592 -- Remove_Context_Clauses --
5593 ----------------------------
5595 procedure Remove_Context_Clauses (N : Node_Id) is
5597 Unit_Name : Entity_Id;
5600 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5601 -- limited-views first and regular-views later (to maintain the
5604 -- First Phase: Remove limited_with context clauses
5606 Item := First (Context_Items (N));
5607 while Present (Item) loop
5609 -- We are interested only in with clauses which got installed
5612 if Nkind (Item) = N_With_Clause
5613 and then Limited_Present (Item)
5614 and then Limited_View_Installed (Item)
5616 Remove_Limited_With_Clause (Item);
5622 -- Second Phase: Loop through context items and undo regular
5623 -- with_clauses and use_clauses.
5625 Item := First (Context_Items (N));
5626 while Present (Item) loop
5628 -- We are interested only in with clauses which got installed on
5629 -- entry, as indicated by their Context_Installed flag set
5631 if Nkind (Item) = N_With_Clause
5632 and then Limited_Present (Item)
5633 and then Limited_View_Installed (Item)
5637 elsif Nkind (Item) = N_With_Clause
5638 and then Context_Installed (Item)
5640 -- Remove items from one with'ed unit
5642 Unit_Name := Entity (Name (Item));
5643 Remove_Unit_From_Visibility (Unit_Name);
5644 Set_Context_Installed (Item, False);
5646 elsif Nkind (Item) = N_Use_Package_Clause then
5647 End_Use_Package (Item);
5649 elsif Nkind (Item) = N_Use_Type_Clause then
5650 End_Use_Type (Item);
5655 end Remove_Context_Clauses;
5657 --------------------------------
5658 -- Remove_Limited_With_Clause --
5659 --------------------------------
5661 procedure Remove_Limited_With_Clause (N : Node_Id) is
5662 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5665 Lim_Header : Entity_Id;
5666 Lim_Typ : Entity_Id;
5670 pragma Assert (Limited_View_Installed (N));
5672 -- In case of limited with_clause on subprograms, generics, instances,
5673 -- or renamings, the corresponding error was previously posted and we
5674 -- have nothing to do here.
5676 if Nkind (P_Unit) /= N_Package_Declaration then
5680 P := Defining_Unit_Name (Specification (P_Unit));
5682 -- Handle child packages
5684 if Nkind (P) = N_Defining_Program_Unit_Name then
5685 P := Defining_Identifier (P);
5688 if Debug_Flag_I then
5689 Write_Str ("remove limited view of ");
5690 Write_Name (Chars (P));
5691 Write_Str (" from visibility");
5695 -- Prepare the removal of the shadow entities from visibility. The
5696 -- first element of the limited view is a header (an E_Package
5697 -- entity) that is used to reference the first shadow entity in the
5698 -- private part of the package
5700 Lim_Header := Limited_View (P);
5701 Lim_Typ := First_Entity (Lim_Header);
5703 -- Remove package and shadow entities from visibility if it has not
5706 if not Analyzed (P_Unit) then
5708 Set_Is_Immediately_Visible (P, False);
5710 while Present (Lim_Typ) loop
5712 Next_Entity (Lim_Typ);
5715 -- Otherwise this package has already appeared in the closure and its
5716 -- shadow entities must be replaced by its real entities. This code
5717 -- must be kept synchronized with the complementary code in Install
5718 -- Limited_Withed_Unit.
5721 -- Real entities that are type or subtype declarations were hidden
5722 -- from visibility at the point of installation of the limited-view.
5723 -- Now we recover the previous value of the hidden attribute.
5725 E := First_Entity (P);
5726 while Present (E) and then E /= First_Private_Entity (P) loop
5728 Set_Is_Hidden (E, Was_Hidden (E));
5734 while Present (Lim_Typ)
5735 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5737 -- Nested packages and child units were not unchained
5739 if Ekind (Lim_Typ) /= E_Package
5740 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5742 -- If the package has incomplete types, the limited view of the
5743 -- incomplete type is in fact never visible (AI05-129) but we
5744 -- have created a shadow entity E1 for it, that points to E2,
5745 -- a non-limited incomplete type. This in turn has a full view
5746 -- E3 that is the full declaration. There is a corresponding
5747 -- shadow entity E4. When reinstalling the non-limited view,
5748 -- E2 must become the current entity and E3 must be ignored.
5750 E := Non_Limited_View (Lim_Typ);
5752 if Present (Current_Entity (E))
5753 and then Ekind (Current_Entity (E)) = E_Incomplete_Type
5754 and then Full_View (Current_Entity (E)) = E
5757 -- Lim_Typ is the limited view of a full type declaration
5758 -- that has a previous incomplete declaration, i.e. E3 from
5759 -- the previous description. Nothing to insert.
5764 pragma Assert (not In_Chain (E));
5766 Prev := Current_Entity (Lim_Typ);
5768 if Prev = Lim_Typ then
5769 Set_Current_Entity (E);
5772 while Present (Prev)
5773 and then Homonym (Prev) /= Lim_Typ
5775 Prev := Homonym (Prev);
5778 if Present (Prev) then
5779 Set_Homonym (Prev, E);
5783 -- Preserve structure of homonym chain
5785 Set_Homonym (E, Homonym (Lim_Typ));
5789 Next_Entity (Lim_Typ);
5793 -- Indicate that the limited view of the package is not installed
5795 Set_From_With_Type (P, False);
5796 Set_Limited_View_Installed (N, False);
5797 end Remove_Limited_With_Clause;
5799 --------------------
5800 -- Remove_Parents --
5801 --------------------
5803 procedure Remove_Parents (Lib_Unit : Node_Id) is
5806 P_Spec : Node_Id := Empty;
5808 Vis : constant Boolean :=
5809 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
5812 if Is_Child_Spec (Lib_Unit) then
5813 P_Spec := Parent_Spec (Lib_Unit);
5815 elsif Nkind (Lib_Unit) = N_Package_Body
5816 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
5818 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
5821 if Present (P_Spec) then
5823 P_Name := Get_Parent_Entity (P);
5824 Remove_Context_Clauses (P_Spec);
5825 End_Package_Scope (P_Name);
5826 Set_Is_Immediately_Visible (P_Name, Vis);
5828 -- Remove from visibility the siblings as well, which are directly
5829 -- visible while the parent is in scope.
5831 E := First_Entity (P_Name);
5832 while Present (E) loop
5833 if Is_Child_Unit (E) then
5834 Set_Is_Immediately_Visible (E, False);
5840 Set_In_Package_Body (P_Name, False);
5842 -- This is the recursive call to remove the context of any higher
5843 -- level parent. This recursion ensures that all parents are removed
5844 -- in the reverse order of their installation.
5850 ---------------------------------
5851 -- Remove_Private_With_Clauses --
5852 ---------------------------------
5854 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
5857 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
5858 -- Check whether a given unit appears in a regular with_clause. Used to
5859 -- determine whether a private_with_clause, implicit or explicit, should
5862 ----------------------------
5863 -- In_Regular_With_Clause --
5864 ----------------------------
5866 function In_Regular_With_Clause (E : Entity_Id) return Boolean
5871 Item := First (Context_Items (Comp_Unit));
5872 while Present (Item) loop
5873 if Nkind (Item) = N_With_Clause
5874 and then Entity (Name (Item)) = E
5875 and then not Private_Present (Item)
5883 end In_Regular_With_Clause;
5885 -- Start of processing for Remove_Private_With_Clauses
5888 Item := First (Context_Items (Comp_Unit));
5889 while Present (Item) loop
5890 if Nkind (Item) = N_With_Clause
5891 and then Private_Present (Item)
5893 -- If private_with_clause is redundant, remove it from
5894 -- context, as a small optimization to subsequent handling
5895 -- of private_with clauses in other nested packages..
5897 if In_Regular_With_Clause (Entity (Name (Item))) then
5899 Nxt : constant Node_Id := Next (Item);
5905 elsif Limited_Present (Item) then
5906 if not Limited_View_Installed (Item) then
5907 Remove_Limited_With_Clause (Item);
5913 Remove_Unit_From_Visibility (Entity (Name (Item)));
5914 Set_Context_Installed (Item, False);
5922 end Remove_Private_With_Clauses;
5924 ---------------------------------
5925 -- Remove_Unit_From_Visibility --
5926 ---------------------------------
5928 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
5929 P : constant Entity_Id := Scope (Unit_Name);
5932 if Debug_Flag_I then
5933 Write_Str ("remove unit ");
5934 Write_Name (Chars (Unit_Name));
5935 Write_Str (" from visibility");
5939 if P /= Standard_Standard then
5940 Set_Is_Visible_Child_Unit (Unit_Name, False);
5943 Set_Is_Potentially_Use_Visible (Unit_Name, False);
5944 Set_Is_Immediately_Visible (Unit_Name, False);
5945 end Remove_Unit_From_Visibility;
5960 procedure Unchain (E : Entity_Id) is
5964 Prev := Current_Entity (E);
5970 Set_Name_Entity_Id (Chars (E), Homonym (E));
5973 while Present (Prev)
5974 and then Homonym (Prev) /= E
5976 Prev := Homonym (Prev);
5979 if Present (Prev) then
5980 Set_Homonym (Prev, Homonym (E));
5984 if Debug_Flag_I then
5985 Write_Str (" (homonym) unchain ");
5986 Write_Name (Chars (E));
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