1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree; use Atree;
28 with Debug; use Debug;
29 with Einfo; use Einfo;
30 with Errout; use Errout;
31 with Exp_Util; use Exp_Util;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
35 with Impunit; use Impunit;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Namet; use Namet;
41 with Nlists; use Nlists;
42 with Nmake; use Nmake;
44 with Output; use Output;
45 with Restrict; use Restrict;
46 with Rident; use Rident;
47 with Rtsfind; use Rtsfind;
49 with Sem_Ch3; use Sem_Ch3;
50 with Sem_Ch6; use Sem_Ch6;
51 with Sem_Ch7; use Sem_Ch7;
52 with Sem_Ch8; use Sem_Ch8;
53 with Sem_Dist; use Sem_Dist;
54 with Sem_Prag; use Sem_Prag;
55 with Sem_Util; use Sem_Util;
56 with Sem_Warn; use Sem_Warn;
57 with Stand; use Stand;
58 with Sinfo; use Sinfo;
59 with Sinfo.CN; use Sinfo.CN;
60 with Sinput; use Sinput;
61 with Snames; use Snames;
62 with Style; use Style;
63 with Stylesw; use Stylesw;
64 with Tbuild; use Tbuild;
65 with Uname; use Uname;
67 package body Sem_Ch10 is
69 -----------------------
70 -- Local Subprograms --
71 -----------------------
73 procedure Analyze_Context (N : Node_Id);
74 -- Analyzes items in the context clause of compilation unit
76 procedure Build_Limited_Views (N : Node_Id);
77 -- Build and decorate the list of shadow entities for a package mentioned
78 -- in a limited_with clause. If the package was not previously analyzed
79 -- then it also performs a basic decoration of the real entities; this
80 -- is required to do not pass non-decorated entities to the back-end.
81 -- Implements Ada 2005 (AI-50217).
83 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id);
84 -- Check whether the source for the body of a compilation unit must
85 -- be included in a standalone library.
87 procedure Check_Private_Child_Unit (N : Node_Id);
88 -- If a with_clause mentions a private child unit, the compilation
89 -- unit must be a member of the same family, as described in 10.1.2 (8).
91 procedure Check_Stub_Level (N : Node_Id);
92 -- Verify that a stub is declared immediately within a compilation unit,
93 -- and not in an inner frame.
95 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id);
96 -- When a child unit appears in a context clause, the implicit withs on
97 -- parents are made explicit, and with clauses are inserted in the context
98 -- clause before the one for the child. If a parent in the with_clause
99 -- is a renaming, the implicit with_clause is on the renaming whose name
100 -- is mentioned in the with_clause, and not on the package it renames.
101 -- N is the compilation unit whose list of context items receives the
102 -- implicit with_clauses.
104 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
105 -- Get defining entity of parent unit of a child unit. In most cases this
106 -- is the defining entity of the unit, but for a child instance whose
107 -- parent needs a body for inlining, the instantiation node of the parent
108 -- has not yet been rewritten as a package declaration, and the entity has
109 -- to be retrieved from the Instance_Spec of the unit.
111 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id);
112 -- If the main unit is a child unit, implicit withs are also added for
113 -- all its ancestors.
115 function In_Chain (E : Entity_Id) return Boolean;
116 -- Check that the shadow entity is not already in the homonym chain, for
117 -- example through a limited_with clause in a parent unit.
119 procedure Install_Context_Clauses (N : Node_Id);
120 -- Subsidiary to Install_Context and Install_Parents. Process only with_
121 -- and use_clauses for current unit and its library unit if any.
123 procedure Install_Limited_Context_Clauses (N : Node_Id);
124 -- Subsidiary to Install_Context. Process only limited with_clauses
125 -- for current unit. Implements Ada 2005 (AI-50217).
127 procedure Install_Limited_Withed_Unit (N : Node_Id);
128 -- Place shadow entities for a limited_with package in the visibility
129 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
131 procedure Install_Withed_Unit
132 (With_Clause : Node_Id;
133 Private_With_OK : Boolean := False);
134 -- If the unit is not a child unit, make unit immediately visible.
135 -- The caller ensures that the unit is not already currently installed.
136 -- The flag Private_With_OK is set true in Install_Private_With_Clauses,
137 -- which is called when compiling the private part of a package, or
138 -- installing the private declarations of a parent unit.
140 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean);
141 -- This procedure establishes the context for the compilation of a child
142 -- unit. If Lib_Unit is a child library spec then the context of the parent
143 -- is installed, and the parent itself made immediately visible, so that
144 -- the child unit is processed in the declarative region of the parent.
145 -- Install_Parents makes a recursive call to itself to ensure that all
146 -- parents are loaded in the nested case. If Lib_Unit is a library body,
147 -- the only effect of Install_Parents is to install the private decls of
148 -- the parents, because the visible parent declarations will have been
149 -- installed as part of the context of the corresponding spec.
151 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id);
152 -- In the compilation of a child unit, a child of any of the ancestor
153 -- units is directly visible if it is visible, because the parent is in
154 -- an enclosing scope. Iterate over context to find child units of U_Name
155 -- or of some ancestor of it.
157 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean;
158 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
159 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
160 -- a library spec that has a parent. If the call to Is_Child_Spec returns
161 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
162 -- compilation unit for the parent spec.
164 -- Lib_Unit can also be a subprogram body that acts as its own spec. If
165 -- the Parent_Spec is non-empty, this is also a child unit.
167 procedure Remove_Context_Clauses (N : Node_Id);
168 -- Subsidiary of previous one. Remove use_ and with_clauses
170 procedure Remove_Limited_With_Clause (N : Node_Id);
171 -- Remove from visibility the shadow entities introduced for a package
172 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
174 procedure Remove_Parents (Lib_Unit : Node_Id);
175 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
176 -- contexts established by the corresponding call to Install_Parents are
177 -- removed. Remove_Parents contains a recursive call to itself to ensure
178 -- that all parents are removed in the nested case.
180 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
181 -- Reset all visibility flags on unit after compiling it, either as a
182 -- main unit or as a unit in the context.
184 procedure Unchain (E : Entity_Id);
185 -- Remove single entity from visibility list
187 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
188 -- Common processing for all stubs (subprograms, tasks, packages, and
189 -- protected cases). N is the stub to be analyzed. Once the subunit
190 -- name is established, load and analyze. Nam is the non-overloadable
191 -- entity for which the proper body provides a completion. Subprogram
192 -- stubs are handled differently because they can be declarations.
195 -- A dummy procedure, for debugging use, called just before analyzing the
196 -- main unit (after dealing with any context clauses).
198 --------------------------
199 -- Limited_With_Clauses --
200 --------------------------
202 -- Limited_With clauses are the mechanism chosen for Ada05 to support
203 -- mutually recursive types declared in different units. A limited_with
204 -- clause that names package P in the context of unit U makes the types
205 -- declared in the visible part of P available within U, but with the
206 -- restriction that these types can only be used as incomplete types.
207 -- The limited_with clause does not impose a semantic dependence on P,
208 -- and it is possible for two packages to have limited_with_clauses on
209 -- each other without creating an elaboration circularity.
211 -- To support this feature, the analysis of a limited_with clause must
212 -- create an abbreviated view of the package, without performing any
213 -- semantic analysis on it. This "package abstract" contains shadow
214 -- types that are in one-one correspondence with the real types in the
215 -- package, and that have the properties of incomplete types.
217 -- The implementation creates two element lists: one to chain the shadow
218 -- entities, and one to chain the corresponding type entities in the tree
219 -- of the package. Links between corresponding entities in both chains
220 -- allow the compiler to select the proper view of a given type, depending
221 -- on the context. Note that in contrast with the handling of private
222 -- types, the limited view and the non-limited view of a type are treated
223 -- as separate entities, and no entity exchange needs to take place, which
224 -- makes the implementation must simpler than could be feared.
226 ------------------------------
227 -- Analyze_Compilation_Unit --
228 ------------------------------
230 procedure Analyze_Compilation_Unit (N : Node_Id) is
231 Unit_Node : constant Node_Id := Unit (N);
232 Lib_Unit : Node_Id := Library_Unit (N);
234 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
235 Par_Spec_Name : Unit_Name_Type;
236 Unum : Unit_Number_Type;
238 procedure Check_Redundant_Withs
239 (Context_Items : List_Id;
240 Spec_Context_Items : List_Id := No_List);
241 -- Determine whether the context list of a compilation unit contains
242 -- redundant with clauses. When checking body clauses against spec
243 -- clauses, set Context_Items to the context list of the body and
244 -- Spec_Context_Items to that of the spec. Parent packages are not
245 -- examined for documentation purposes.
247 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
248 -- Generate cross-reference information for the parents of child units.
249 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
251 ---------------------------
252 -- Check_Redundant_Withs --
253 ---------------------------
255 procedure Check_Redundant_Withs
256 (Context_Items : List_Id;
257 Spec_Context_Items : List_Id := No_List)
261 procedure Process_Body_Clauses
262 (Context_List : List_Id;
264 Used : in out Boolean;
265 Used_Type_Or_Elab : in out Boolean);
266 -- Examine the context clauses of a package body, trying to match
267 -- the name entity of Clause with any list element. If the match
268 -- occurs on a use package clause, set Used to True, for a use
269 -- type clause, pragma Elaborate or pragma Elaborate_All, set
270 -- Used_Type_Or_Elab to True.
272 procedure Process_Spec_Clauses
273 (Context_List : List_Id;
275 Used : in out Boolean;
276 Withed : in out Boolean;
277 Exit_On_Self : Boolean := False);
278 -- Examine the context clauses of a package spec, trying to match
279 -- the name entity of Clause with any list element. If the match
280 -- occurs on a use package clause, set Used to True, for a with
281 -- package clause other than Clause, set Withed to True. Limited
282 -- with clauses, implicitly generated with clauses and withs
283 -- having pragmas Elaborate or Elaborate_All applied to them are
284 -- skipped. Exit_On_Self is used to control the search loop and
285 -- force an exit whenever Clause sees itself in the search.
287 --------------------------
288 -- Process_Body_Clauses --
289 --------------------------
291 procedure Process_Body_Clauses
292 (Context_List : List_Id;
294 Used : in out Boolean;
295 Used_Type_Or_Elab : in out Boolean)
297 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
303 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean;
304 -- In an expanded name in a use clause, if the prefix is a
305 -- renamed package, the entity is set to the original package
306 -- as a result, when checking whether the package appears in a
307 -- previous with_clause, the renaming has to be taken into
308 -- account, to prevent spurious or incorrect warnings. The
309 -- common case is the use of Text_IO.
315 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean is
317 return Entity (N) = P
319 (Present (Renamed_Object (P))
320 and then Entity (N) = Renamed_Object (P));
323 -- Start of processing for Process_Body_Clauses
327 Used_Type_Or_Elab := False;
329 Cont_Item := First (Context_List);
330 while Present (Cont_Item) loop
332 -- Package use clause
334 if Nkind (Cont_Item) = N_Use_Package_Clause
337 -- Search through use clauses
339 Use_Item := First (Names (Cont_Item));
340 while Present (Use_Item) and then not Used loop
342 -- Case of a direct use of the one we are looking for
344 if Entity (Use_Item) = Nam_Ent then
347 -- Handle nested case, as in "with P; use P.Q.R"
354 -- Loop through prefixes looking for match
357 while Nkind (UE) = N_Expanded_Name loop
358 if Same_Unit (Prefix (UE), Nam_Ent) then
373 elsif Nkind (Cont_Item) = N_Use_Type_Clause
374 and then not Used_Type_Or_Elab
376 Subt_Mark := First (Subtype_Marks (Cont_Item));
377 while Present (Subt_Mark)
378 and then not Used_Type_Or_Elab
380 if Same_Unit (Prefix (Subt_Mark), Nam_Ent) then
381 Used_Type_Or_Elab := True;
387 -- Pragma Elaborate or Elaborate_All
389 elsif Nkind (Cont_Item) = N_Pragma
391 (Chars (Cont_Item) = Name_Elaborate
393 Chars (Cont_Item) = Name_Elaborate_All)
394 and then not Used_Type_Or_Elab
397 First (Pragma_Argument_Associations (Cont_Item));
398 while Present (Prag_Unit)
399 and then not Used_Type_Or_Elab
401 if Entity (Expression (Prag_Unit)) = Nam_Ent then
402 Used_Type_Or_Elab := True;
411 end Process_Body_Clauses;
413 --------------------------
414 -- Process_Spec_Clauses --
415 --------------------------
417 procedure Process_Spec_Clauses
418 (Context_List : List_Id;
420 Used : in out Boolean;
421 Withed : in out Boolean;
422 Exit_On_Self : Boolean := False)
424 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
432 Cont_Item := First (Context_List);
433 while Present (Cont_Item) loop
435 -- Stop the search since the context items after Cont_Item
436 -- have already been examined in a previous iteration of
437 -- the reverse loop in Check_Redundant_Withs.
440 and Cont_Item = Clause
445 -- Package use clause
447 if Nkind (Cont_Item) = N_Use_Package_Clause
450 Use_Item := First (Names (Cont_Item));
451 while Present (Use_Item) and then not Used loop
452 if Entity (Use_Item) = Nam_Ent then
459 -- Package with clause. Avoid processing self, implicitly
460 -- generated with clauses or limited with clauses. Note
461 -- that we examine with clauses having pragmas Elaborate
462 -- or Elaborate_All applied to them due to cases such as:
466 -- pragma Elaborate (Pack);
468 -- In this case, the second with clause is redundant since
469 -- the pragma applies only to the first "with Pack;".
471 elsif Nkind (Cont_Item) = N_With_Clause
472 and then not Implicit_With (Cont_Item)
473 and then not Limited_Present (Cont_Item)
474 and then Cont_Item /= Clause
475 and then Entity (Name (Cont_Item)) = Nam_Ent
482 end Process_Spec_Clauses;
484 -- Start of processing for Check_Redundant_Withs
487 Clause := Last (Context_Items);
488 while Present (Clause) loop
490 -- Avoid checking implicitly generated with clauses, limited
491 -- with clauses or withs that have pragma Elaborate or
492 -- Elaborate_All apllied.
494 if Nkind (Clause) = N_With_Clause
495 and then not Implicit_With (Clause)
496 and then not Limited_Present (Clause)
497 and then not Elaborate_Present (Clause)
499 -- Package body-to-spec check
501 if Present (Spec_Context_Items) then
503 Used_In_Body : Boolean := False;
504 Used_In_Spec : Boolean := False;
505 Used_Type_Or_Elab : Boolean := False;
506 Withed_In_Spec : Boolean := False;
510 (Context_List => Spec_Context_Items,
512 Used => Used_In_Spec,
513 Withed => Withed_In_Spec);
516 (Context_List => Context_Items,
518 Used => Used_In_Body,
519 Used_Type_Or_Elab => Used_Type_Or_Elab);
521 -- "Type Elab" refers to the presence of either a use
522 -- type clause, pragmas Elaborate or Elaborate_All.
524 -- +---------------+---------------------------+------+
525 -- | Spec | Body | Warn |
526 -- +--------+------+--------+------+-----------+------+
527 -- | Withed | Used | Withed | Used | Type Elab | |
528 -- | X | | X | | | X |
529 -- | X | | X | X | | |
530 -- | X | | X | | X | |
531 -- | X | | X | X | X | |
532 -- | X | X | X | | | X |
533 -- | X | X | X | | X | |
534 -- | X | X | X | X | | X |
535 -- | X | X | X | X | X | |
536 -- +--------+------+--------+------+-----------+------+
539 and then not Used_Type_Or_Elab)
542 and then not Used_In_Body)
546 Error_Msg_N ("?redundant with clause in body", Clause);
549 Used_In_Body := False;
550 Used_In_Spec := False;
551 Used_Type_Or_Elab := False;
552 Withed_In_Spec := False;
555 -- Standalone package spec or body check
559 Dont_Care : Boolean := False;
560 Withed : Boolean := False;
563 -- The mechanism for examining the context clauses of a
564 -- package spec can be applied to package body clauses.
567 (Context_List => Context_Items,
571 Exit_On_Self => True);
574 Error_Msg_N ("?redundant with clause", Clause);
582 end Check_Redundant_Withs;
584 --------------------------------
585 -- Generate_Parent_References --
586 --------------------------------
588 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is
590 P_Name : Entity_Id := P_Id;
593 Pref := Name (Parent (Defining_Entity (N)));
595 if Nkind (Pref) = N_Expanded_Name then
597 -- Done already, if the unit has been compiled indirectly as
598 -- part of the closure of its context because of inlining.
603 while Nkind (Pref) = N_Selected_Component loop
604 Change_Selected_Component_To_Expanded_Name (Pref);
605 Set_Entity (Pref, P_Name);
606 Set_Etype (Pref, Etype (P_Name));
607 Generate_Reference (P_Name, Pref, 'r');
608 Pref := Prefix (Pref);
609 P_Name := Scope (P_Name);
612 -- The guard here on P_Name is to handle the error condition where
613 -- the parent unit is missing because the file was not found.
615 if Present (P_Name) then
616 Set_Entity (Pref, P_Name);
617 Set_Etype (Pref, Etype (P_Name));
618 Generate_Reference (P_Name, Pref, 'r');
619 Style.Check_Identifier (Pref, P_Name);
621 end Generate_Parent_References;
623 -- Start of processing for Analyze_Compilation_Unit
626 Process_Compilation_Unit_Pragmas (N);
628 -- If the unit is a subunit whose parent has not been analyzed (which
629 -- indicates that the main unit is a subunit, either the current one or
630 -- one of its descendents) then the subunit is compiled as part of the
631 -- analysis of the parent, which we proceed to do. Basically this gets
632 -- handled from the top down and we don't want to do anything at this
633 -- level (i.e. this subunit will be handled on the way down from the
634 -- parent), so at this level we immediately return. If the subunit
635 -- ends up not analyzed, it means that the parent did not contain a
636 -- stub for it, or that there errors were dectected in some ancestor.
638 if Nkind (Unit_Node) = N_Subunit
639 and then not Analyzed (Lib_Unit)
641 Semantics (Lib_Unit);
643 if not Analyzed (Proper_Body (Unit_Node)) then
644 if Serious_Errors_Detected > 0 then
645 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N);
647 Error_Msg_N ("missing stub for subunit", N);
654 -- Analyze context (this will call Sem recursively for with'ed units)
658 -- If the unit is a package body, the spec is already loaded and must
659 -- be analyzed first, before we analyze the body.
661 if Nkind (Unit_Node) = N_Package_Body then
663 -- If no Lib_Unit, then there was a serious previous error, so
664 -- just ignore the entire analysis effort
666 if No (Lib_Unit) then
670 Semantics (Lib_Unit);
671 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
673 -- Verify that the library unit is a package declaration
675 if Nkind (Unit (Lib_Unit)) /= N_Package_Declaration
677 Nkind (Unit (Lib_Unit)) /= N_Generic_Package_Declaration
680 ("no legal package declaration for package body", N);
683 -- Otherwise, the entity in the declaration is visible. Update
684 -- the version to reflect dependence of this body on the spec.
687 Spec_Id := Defining_Entity (Unit (Lib_Unit));
688 Set_Is_Immediately_Visible (Spec_Id, True);
689 Version_Update (N, Lib_Unit);
691 if Nkind (Defining_Unit_Name (Unit_Node))
692 = N_Defining_Program_Unit_Name
694 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
699 -- If the unit is a subprogram body, then we similarly need to analyze
700 -- its spec. However, things are a little simpler in this case, because
701 -- here, this analysis is done only for error checking and consistency
702 -- purposes, so there's nothing else to be done.
704 elsif Nkind (Unit_Node) = N_Subprogram_Body then
705 if Acts_As_Spec (N) then
707 -- If the subprogram body is a child unit, we must create a
708 -- declaration for it, in order to properly load the parent(s).
709 -- After this, the original unit does not acts as a spec, because
710 -- there is an explicit one. If this unit appears in a context
711 -- clause, then an implicit with on the parent will be added when
712 -- installing the context. If this is the main unit, there is no
713 -- Unit_Table entry for the declaration (it has the unit number
714 -- of the main unit) and code generation is unaffected.
716 Unum := Get_Cunit_Unit_Number (N);
717 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
719 if Par_Spec_Name /= No_Unit_Name then
722 (Load_Name => Par_Spec_Name,
727 if Unum /= No_Unit then
729 -- Build subprogram declaration and attach parent unit to it
730 -- This subprogram declaration does not come from source,
731 -- Nevertheless the backend must generate debugging info for
732 -- it, and this must be indicated explicitly. We also mark
733 -- the body entity as a child unit now, to prevent a
734 -- cascaded error if the spec entity cannot be entered
738 Loc : constant Source_Ptr := Sloc (N);
739 SCS : constant Boolean :=
740 Get_Comes_From_Source_Default;
743 Set_Comes_From_Source_Default (False);
745 Make_Compilation_Unit (Loc,
746 Context_Items => New_Copy_List (Context_Items (N)),
748 Make_Subprogram_Declaration (Sloc (N),
751 (Specification (Unit_Node))),
753 Make_Compilation_Unit_Aux (Loc));
755 Set_Library_Unit (N, Lib_Unit);
756 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
757 Semantics (Lib_Unit);
759 -- Now that a separate declaration exists, the body
760 -- of the child unit does not act as spec any longer.
762 Set_Acts_As_Spec (N, False);
763 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
764 Set_Needs_Debug_Info (Defining_Entity (Unit (Lib_Unit)));
765 Set_Comes_From_Source_Default (SCS);
770 -- Here for subprogram with separate declaration
773 Semantics (Lib_Unit);
774 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
775 Version_Update (N, Lib_Unit);
778 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
779 N_Defining_Program_Unit_Name
781 Generate_Parent_References (
782 Specification (Unit_Node),
783 Scope (Defining_Entity (Unit (Lib_Unit))));
787 -- If it is a child unit, the parent must be elaborated first
788 -- and we update version, since we are dependent on our parent.
790 if Is_Child_Spec (Unit_Node) then
792 -- The analysis of the parent is done with style checks off
795 Save_Style_Check : constant Boolean := Style_Check;
796 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
797 Cunit_Boolean_Restrictions_Save;
800 if not GNAT_Mode then
801 Style_Check := False;
804 Semantics (Parent_Spec (Unit_Node));
805 Version_Update (N, Parent_Spec (Unit_Node));
806 Style_Check := Save_Style_Check;
807 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
811 -- With the analysis done, install the context. Note that we can't
812 -- install the context from the with clauses as we analyze them, because
813 -- each with clause must be analyzed in a clean visibility context, so
814 -- we have to wait and install them all at once.
818 if Is_Child_Spec (Unit_Node) then
820 -- Set the entities of all parents in the program_unit_name
822 Generate_Parent_References (
823 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
826 -- All components of the context: with-clauses, library unit, ancestors
827 -- if any, (and their context) are analyzed and installed.
829 -- Call special debug routine sm if this is the main unit
831 if Current_Sem_Unit = Main_Unit then
835 -- Now analyze the unit (package, subprogram spec, body) itself
839 if Warn_On_Redundant_Constructs then
840 Check_Redundant_Withs (Context_Items (N));
842 if Nkind (Unit_Node) = N_Package_Body then
843 Check_Redundant_Withs
844 (Context_Items => Context_Items (N),
845 Spec_Context_Items => Context_Items (Lib_Unit));
849 -- The above call might have made Unit_Node an N_Subprogram_Body from
850 -- something else, so propagate any Acts_As_Spec flag.
852 if Nkind (Unit_Node) = N_Subprogram_Body
853 and then Acts_As_Spec (Unit_Node)
855 Set_Acts_As_Spec (N);
858 -- Register predefined units in Rtsfind
861 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
863 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
864 Set_RTU_Loaded (Unit_Node);
868 -- Treat compilation unit pragmas that appear after the library unit
870 if Present (Pragmas_After (Aux_Decls_Node (N))) then
872 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
874 while Present (Prag_Node) loop
881 -- Generate distribution stubs if requested and no error
884 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
886 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
887 and then not Fatal_Error (Main_Unit)
889 if Is_RCI_Pkg_Spec_Or_Body (N) then
891 -- Regular RCI package
893 Add_Stub_Constructs (N);
895 elsif (Nkind (Unit_Node) = N_Package_Declaration
896 and then Is_Shared_Passive (Defining_Entity
897 (Specification (Unit_Node))))
898 or else (Nkind (Unit_Node) = N_Package_Body
900 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
902 -- Shared passive package
904 Add_Stub_Constructs (N);
906 elsif Nkind (Unit_Node) = N_Package_Instantiation
908 Is_Remote_Call_Interface
909 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
911 -- Instantiation of a RCI generic package
913 Add_Stub_Constructs (N);
918 -- Remove unit from visibility, so that environment is clean for
919 -- the next compilation, which is either the main unit or some
920 -- other unit in the context.
922 if Nkind (Unit_Node) = N_Package_Declaration
923 or else Nkind (Unit_Node) in N_Generic_Declaration
924 or else Nkind (Unit_Node) = N_Package_Renaming_Declaration
925 or else Nkind (Unit_Node) = N_Subprogram_Declaration
927 (Nkind (Unit_Node) = N_Subprogram_Body
928 and then Acts_As_Spec (Unit_Node))
930 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
932 -- If the unit is an instantiation whose body will be elaborated for
933 -- inlining purposes, use the the proper entity of the instance. The
934 -- entity may be missing if the instantiation was illegal.
936 elsif Nkind (Unit_Node) = N_Package_Instantiation
937 and then not Error_Posted (Unit_Node)
938 and then Present (Instance_Spec (Unit_Node))
940 Remove_Unit_From_Visibility
941 (Defining_Entity (Instance_Spec (Unit_Node)));
943 elsif Nkind (Unit_Node) = N_Package_Body
944 or else (Nkind (Unit_Node) = N_Subprogram_Body
945 and then not Acts_As_Spec (Unit_Node))
947 -- Bodies that are not the main unit are compiled if they are generic
948 -- or contain generic or inlined units. Their analysis brings in the
949 -- context of the corresponding spec (unit declaration) which must be
950 -- removed as well, to return the compilation environment to its
953 Remove_Context (Lib_Unit);
954 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
957 -- Last step is to deinstall the context we just installed as well as
958 -- the unit just compiled.
962 -- If this is the main unit and we are generating code, we must check
963 -- that all generic units in the context have a body if they need it,
964 -- even if they have not been instantiated. In the absence of .ali files
965 -- for generic units, we must force the load of the body, just to
966 -- produce the proper error if the body is absent. We skip this
967 -- verification if the main unit itself is generic.
969 if Get_Cunit_Unit_Number (N) = Main_Unit
970 and then Operating_Mode = Generate_Code
971 and then Expander_Active
973 -- Check whether the source for the body of the unit must be included
974 -- in a standalone library.
976 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
978 -- Indicate that the main unit is now analyzed, to catch possible
979 -- circularities between it and generic bodies. Remove main unit from
980 -- visibility. This might seem superfluous, but the main unit must
981 -- not be visible in the generic body expansions that follow.
983 Set_Analyzed (N, True);
984 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
989 Un : Unit_Number_Type;
991 Save_Style_Check : constant Boolean := Style_Check;
992 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
993 Cunit_Boolean_Restrictions_Save;
996 Item := First (Context_Items (N));
997 while Present (Item) loop
999 -- Check for explicit with clause
1001 if Nkind (Item) = N_With_Clause
1002 and then not Implicit_With (Item)
1004 -- Ada 2005 (AI-50217): Ignore limited-withed units
1006 and then not Limited_Present (Item)
1008 Nam := Entity (Name (Item));
1010 if (Is_Generic_Subprogram (Nam)
1011 and then not Is_Intrinsic_Subprogram (Nam))
1012 or else (Ekind (Nam) = E_Generic_Package
1013 and then Unit_Requires_Body (Nam))
1015 Style_Check := False;
1017 if Present (Renamed_Object (Nam)) then
1020 (Load_Name => Get_Body_Name
1022 (Unit_Declaration_Node
1023 (Renamed_Object (Nam)))),
1031 (Load_Name => Get_Body_Name
1032 (Get_Unit_Name (Item)),
1039 if Un = No_Unit then
1041 ("body of generic unit& not found", Item, Nam);
1044 elsif not Analyzed (Cunit (Un))
1045 and then Un /= Main_Unit
1046 and then not Fatal_Error (Un)
1048 Style_Check := False;
1049 Semantics (Cunit (Un));
1057 Style_Check := Save_Style_Check;
1058 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1062 -- Deal with creating elaboration Boolean if needed. We create an
1063 -- elaboration boolean only for units that come from source since
1064 -- units manufactured by the compiler never need elab checks.
1066 if Comes_From_Source (N)
1068 (Nkind (Unit_Node) = N_Package_Declaration or else
1069 Nkind (Unit_Node) = N_Generic_Package_Declaration or else
1070 Nkind (Unit_Node) = N_Subprogram_Declaration or else
1071 Nkind (Unit_Node) = N_Generic_Subprogram_Declaration)
1074 Loc : constant Source_Ptr := Sloc (N);
1075 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1078 Spec_Id := Defining_Entity (Unit_Node);
1079 Generate_Definition (Spec_Id);
1081 -- See if an elaboration entity is required for possible access
1082 -- before elaboration checking. Note that we must allow for this
1083 -- even if -gnatE is not set, since a client may be compiled in
1084 -- -gnatE mode and reference the entity.
1086 -- These entities are also used by the binder to prevent multiple
1087 -- attempts to execute the elaboration code for the library case
1088 -- where the elaboration routine might otherwise be called more
1091 -- Case of units which do not require elaboration checks
1094 -- Pure units do not need checks
1098 -- Preelaborated units do not need checks
1100 or else Is_Preelaborated (Spec_Id)
1102 -- No checks needed if pagma Elaborate_Body present
1104 or else Has_Pragma_Elaborate_Body (Spec_Id)
1106 -- No checks needed if unit does not require a body
1108 or else not Unit_Requires_Body (Spec_Id)
1110 -- No checks needed for predefined files
1112 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1114 -- No checks required if no separate spec
1116 or else Acts_As_Spec (N)
1118 -- This is a case where we only need the entity for
1119 -- checking to prevent multiple elaboration checks.
1121 Set_Elaboration_Entity_Required (Spec_Id, False);
1123 -- Case of elaboration entity is required for access before
1124 -- elaboration checking (so certainly we must build it!)
1127 Set_Elaboration_Entity_Required (Spec_Id, True);
1130 Build_Elaboration_Entity (N, Spec_Id);
1134 -- Freeze the compilation unit entity. This for sure is needed because
1135 -- of some warnings that can be output (see Freeze_Subprogram), but may
1136 -- in general be required. If freezing actions result, place them in the
1137 -- compilation unit actions list, and analyze them.
1140 Loc : constant Source_Ptr := Sloc (N);
1141 L : constant List_Id :=
1142 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), Loc);
1144 while Is_Non_Empty_List (L) loop
1145 Insert_Library_Level_Action (Remove_Head (L));
1151 if Nkind (Unit_Node) = N_Package_Declaration
1152 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1153 and then Expander_Active
1156 Save_Style_Check : constant Boolean := Style_Check;
1157 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1158 Options : Style_Check_Options;
1161 Save_Style_Check_Options (Options);
1162 Reset_Style_Check_Options;
1163 Opt.Warning_Mode := Suppress;
1164 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1166 Reset_Style_Check_Options;
1167 Set_Style_Check_Options (Options);
1168 Style_Check := Save_Style_Check;
1169 Warning_Mode := Save_Warning;
1173 -- If we are generating obsolescent warnings, then here is where we
1174 -- generate them for the with'ed items. The reason for this special
1175 -- processing is that the normal mechanism of generating the warnings
1176 -- for referenced entities does not work for context clause references.
1177 -- That's because when we first analyze the context, it is too early to
1178 -- know if the with'ing unit is itself obsolescent (which suppresses
1181 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1183 -- Push current compilation unit as scope, so that the test for
1184 -- being within an obsolescent unit will work correctly.
1186 Push_Scope (Defining_Entity (Unit_Node));
1188 -- Loop through context items to deal with with clauses
1196 Item := First (Context_Items (N));
1197 while Present (Item) loop
1198 if Nkind (Item) = N_With_Clause
1200 -- Suppress this check in limited-withed units. Further work
1201 -- needed here if we decide to incorporate this check on
1202 -- limited-withed units.
1204 and then not Limited_Present (Item)
1207 Ent := Entity (Nam);
1209 if Is_Obsolescent (Ent) then
1210 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1218 -- Remove temporary install of current unit as scope
1222 end Analyze_Compilation_Unit;
1224 ---------------------
1225 -- Analyze_Context --
1226 ---------------------
1228 procedure Analyze_Context (N : Node_Id) is
1229 Ukind : constant Node_Kind := Nkind (Unit (N));
1233 -- First process all configuration pragmas at the start of the context
1234 -- items. Strictly these are not part of the context clause, but that
1235 -- is where the parser puts them. In any case for sure we must analyze
1236 -- these before analyzing the actual context items, since they can have
1237 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1238 -- be with'ed as a result of changing categorizations in Ada 2005).
1240 Item := First (Context_Items (N));
1241 while Present (Item)
1242 and then Nkind (Item) = N_Pragma
1243 and then Chars (Item) in Configuration_Pragma_Names
1249 -- Loop through actual context items. This is done in two passes:
1251 -- a) The first pass analyzes non-limited with-clauses and also any
1252 -- configuration pragmas (we need to get the latter analyzed right
1253 -- away, since they can affect processing of subsequent items.
1255 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1257 while Present (Item) loop
1259 -- For with clause, analyze the with clause, and then update
1260 -- the version, since we are dependent on a unit that we with.
1262 if Nkind (Item) = N_With_Clause
1263 and then not Limited_Present (Item)
1265 -- Skip analyzing with clause if no unit, nothing to do (this
1266 -- happens for a with that references a non-existant unit)
1268 if Present (Library_Unit (Item)) then
1272 if not Implicit_With (Item) then
1273 Version_Update (N, Library_Unit (Item));
1276 -- Skip pragmas. Configuration pragmas at the start were handled in
1277 -- the loop above, and remaining pragmas are not processed until we
1278 -- actually install the context (see Install_Context). We delay the
1279 -- analysis of these pragmas to make sure that we have installed all
1280 -- the implicit with's on parent units.
1282 -- Skip use clauses at this stage, since we don't want to do any
1283 -- installing of potentially use visible entities until we we
1284 -- actually install the complete context (in Install_Context).
1285 -- Otherwise things can get installed in the wrong context.
1294 -- Second pass: examine all limited_with clauses. All other context
1295 -- items are ignored in this pass.
1297 Item := First (Context_Items (N));
1298 while Present (Item) loop
1299 if Nkind (Item) = N_With_Clause
1300 and then Limited_Present (Item)
1302 -- No need to check errors on implicitly generated limited-with
1305 if not Implicit_With (Item) then
1307 -- Check compilation unit containing the limited-with clause
1309 if Ukind /= N_Package_Declaration
1310 and then Ukind /= N_Subprogram_Declaration
1311 and then Ukind /= N_Package_Renaming_Declaration
1312 and then Ukind /= N_Subprogram_Renaming_Declaration
1313 and then Ukind not in N_Generic_Declaration
1314 and then Ukind not in N_Generic_Renaming_Declaration
1315 and then Ukind not in N_Generic_Instantiation
1317 Error_Msg_N ("limited with_clause not allowed here", Item);
1319 -- Check wrong use of a limited with clause applied to the
1320 -- compilation unit containing the limited-with clause.
1322 -- limited with P.Q;
1323 -- package P.Q is ...
1325 elsif Unit (Library_Unit (Item)) = Unit (N) then
1326 Error_Msg_N ("wrong use of limited-with clause", Item);
1328 -- Check wrong use of limited-with clause applied to some
1329 -- immediate ancestor.
1331 elsif Is_Child_Spec (Unit (N)) then
1333 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1337 P := Parent_Spec (Unit (N));
1339 if Unit (P) = Lib_U then
1340 Error_Msg_N ("limited with_clause of immediate "
1341 & "ancestor not allowed", Item);
1345 exit when not Is_Child_Spec (Unit (P));
1346 P := Parent_Spec (Unit (P));
1351 -- Check if the limited-withed unit is already visible through
1352 -- some context clause of the current compilation unit or some
1353 -- ancestor of the current compilation unit.
1356 Lim_Unit_Name : constant Node_Id := Name (Item);
1357 Comp_Unit : Node_Id;
1359 Unit_Name : Node_Id;
1364 It := First (Context_Items (Comp_Unit));
1365 while Present (It) loop
1367 and then Nkind (It) = N_With_Clause
1368 and then not Limited_Present (It)
1370 (Nkind (Unit (Library_Unit (It)))
1371 = N_Package_Declaration
1373 Nkind (Unit (Library_Unit (It)))
1374 = N_Package_Renaming_Declaration)
1376 if Nkind (Unit (Library_Unit (It)))
1377 = N_Package_Declaration
1379 Unit_Name := Name (It);
1381 Unit_Name := Name (Unit (Library_Unit (It)));
1384 -- Check if the named package (or some ancestor)
1385 -- leaves visible the full-view of the unit given
1386 -- in the limited-with clause
1389 if Designate_Same_Unit (Lim_Unit_Name,
1392 Error_Msg_Sloc := Sloc (It);
1394 ("simultaneous visibility of limited "
1395 & "and unlimited views not allowed",
1398 ("\unlimited view visible through "
1399 & "context clause #",
1403 elsif Nkind (Unit_Name) = N_Identifier then
1407 Unit_Name := Prefix (Unit_Name);
1414 exit when not Is_Child_Spec (Unit (Comp_Unit));
1416 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1421 -- Skip analyzing with clause if no unit, see above
1423 if Present (Library_Unit (Item)) then
1427 -- A limited_with does not impose an elaboration order, but
1428 -- there is a semantic dependency for recompilation purposes.
1430 if not Implicit_With (Item) then
1431 Version_Update (N, Library_Unit (Item));
1434 -- Pragmas and use clauses and with clauses other than limited
1435 -- with's are ignored in this pass through the context items.
1443 end Analyze_Context;
1445 -------------------------------
1446 -- Analyze_Package_Body_Stub --
1447 -------------------------------
1449 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1450 Id : constant Entity_Id := Defining_Identifier (N);
1454 -- The package declaration must be in the current declarative part
1456 Check_Stub_Level (N);
1457 Nam := Current_Entity_In_Scope (Id);
1459 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1460 Error_Msg_N ("missing specification for package stub", N);
1462 elsif Has_Completion (Nam)
1463 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1465 Error_Msg_N ("duplicate or redundant stub for package", N);
1468 -- Indicate that the body of the package exists. If we are doing
1469 -- only semantic analysis, the stub stands for the body. If we are
1470 -- generating code, the existence of the body will be confirmed
1471 -- when we load the proper body.
1473 Set_Has_Completion (Nam);
1474 Set_Scope (Defining_Entity (N), Current_Scope);
1475 Generate_Reference (Nam, Id, 'b');
1476 Analyze_Proper_Body (N, Nam);
1478 end Analyze_Package_Body_Stub;
1480 -------------------------
1481 -- Analyze_Proper_Body --
1482 -------------------------
1484 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1485 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1486 Unum : Unit_Number_Type;
1488 procedure Optional_Subunit;
1489 -- This procedure is called when the main unit is a stub, or when we
1490 -- are not generating code. In such a case, we analyze the subunit if
1491 -- present, which is user-friendly and in fact required for ASIS, but
1492 -- we don't complain if the subunit is missing.
1494 ----------------------
1495 -- Optional_Subunit --
1496 ----------------------
1498 procedure Optional_Subunit is
1499 Comp_Unit : Node_Id;
1502 -- Try to load subunit, but ignore any errors that occur during
1503 -- the loading of the subunit, by using the special feature in
1504 -- Errout to ignore all errors. Note that Fatal_Error will still
1505 -- be set, so we will be able to check for this case below.
1507 if not ASIS_Mode then
1508 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1513 (Load_Name => Subunit_Name,
1518 if not ASIS_Mode then
1519 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1522 -- All done if we successfully loaded the subunit
1525 and then (not Fatal_Error (Unum) or else Try_Semantics)
1527 Comp_Unit := Cunit (Unum);
1529 -- If the file was empty or seriously mangled, the unit
1530 -- itself may be missing.
1532 if No (Unit (Comp_Unit)) then
1534 ("subunit does not contain expected proper body", N);
1536 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1538 ("expected SEPARATE subunit, found child unit",
1539 Cunit_Entity (Unum));
1541 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1542 Analyze_Subunit (Comp_Unit);
1543 Set_Library_Unit (N, Comp_Unit);
1546 elsif Unum = No_Unit
1547 and then Present (Nam)
1549 if Is_Protected_Type (Nam) then
1550 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1552 Set_Corresponding_Body (
1553 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1556 end Optional_Subunit;
1558 -- Start of processing for Analyze_Proper_Body
1561 -- If the subunit is already loaded, it means that the main unit
1562 -- is a subunit, and that the current unit is one of its parents
1563 -- which was being analyzed to provide the needed context for the
1564 -- analysis of the subunit. In this case we analyze the subunit and
1565 -- continue with the parent, without looking a subsequent subunits.
1567 if Is_Loaded (Subunit_Name) then
1569 -- If the proper body is already linked to the stub node,
1570 -- the stub is in a generic unit and just needs analyzing.
1572 if Present (Library_Unit (N)) then
1573 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1574 Analyze_Subunit (Library_Unit (N));
1576 -- Otherwise we must load the subunit and link to it
1579 -- Load the subunit, this must work, since we originally
1580 -- loaded the subunit earlier on. So this will not really
1581 -- load it, just give access to it.
1585 (Load_Name => Subunit_Name,
1590 -- And analyze the subunit in the parent context (note that we
1591 -- do not call Semantics, since that would remove the parent
1592 -- context). Because of this, we have to manually reset the
1593 -- compiler state to Analyzing since it got destroyed by Load.
1595 if Unum /= No_Unit then
1596 Compiler_State := Analyzing;
1598 -- Check that the proper body is a subunit and not a child
1599 -- unit. If the unit was previously loaded, the error will
1600 -- have been emitted when copying the generic node, so we
1601 -- just return to avoid cascaded errors.
1603 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1607 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1608 Analyze_Subunit (Cunit (Unum));
1609 Set_Library_Unit (N, Cunit (Unum));
1613 -- If the main unit is a subunit, then we are just performing semantic
1614 -- analysis on that subunit, and any other subunits of any parent unit
1615 -- should be ignored, except that if we are building trees for ASIS
1616 -- usage we want to annotate the stub properly.
1618 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1619 and then Subunit_Name /= Unit_Name (Main_Unit)
1625 -- But before we return, set the flag for unloaded subunits. This
1626 -- will suppress junk warnings of variables in the same declarative
1627 -- part (or a higher level one) that are in danger of looking unused
1628 -- when in fact there might be a declaration in the subunit that we
1629 -- do not intend to load.
1631 Unloaded_Subunits := True;
1634 -- If the subunit is not already loaded, and we are generating code,
1635 -- then this is the case where compilation started from the parent,
1636 -- and we are generating code for an entire subunit tree. In that
1637 -- case we definitely need to load the subunit.
1639 -- In order to continue the analysis with the rest of the parent,
1640 -- and other subunits, we load the unit without requiring its
1641 -- presence, and emit a warning if not found, rather than terminating
1642 -- the compilation abruptly, as for other missing file problems.
1644 elsif Original_Operating_Mode = Generate_Code then
1646 -- If the proper body is already linked to the stub node,
1647 -- the stub is in a generic unit and just needs analyzing.
1649 -- We update the version. Although we are not technically
1650 -- semantically dependent on the subunit, given our approach
1651 -- of macro substitution of subunits, it makes sense to
1652 -- include it in the version identification.
1654 if Present (Library_Unit (N)) then
1655 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1656 Analyze_Subunit (Library_Unit (N));
1657 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1659 -- Otherwise we must load the subunit and link to it
1664 (Load_Name => Subunit_Name,
1669 if Original_Operating_Mode = Generate_Code
1670 and then Unum = No_Unit
1672 Error_Msg_Unit_1 := Subunit_Name;
1674 Get_File_Name (Subunit_Name, Subunit => True);
1676 ("subunit$$ in file{ not found?", N);
1677 Subunits_Missing := True;
1680 -- Load_Unit may reset Compiler_State, since it may have been
1681 -- necessary to parse an additional units, so we make sure
1682 -- that we reset it to the Analyzing state.
1684 Compiler_State := Analyzing;
1686 if Unum /= No_Unit then
1687 if Debug_Flag_L then
1688 Write_Str ("*** Loaded subunit from stub. Analyze");
1693 Comp_Unit : constant Node_Id := Cunit (Unum);
1696 -- Check for child unit instead of subunit
1698 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1700 ("expected SEPARATE subunit, found child unit",
1701 Cunit_Entity (Unum));
1703 -- OK, we have a subunit
1706 -- Set corresponding stub (even if errors)
1708 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1710 -- Analyze the unit if semantics active
1712 if not Fatal_Error (Unum) or else Try_Semantics then
1713 Analyze_Subunit (Comp_Unit);
1716 -- Set the library unit pointer in any case
1718 Set_Library_Unit (N, Comp_Unit);
1720 -- We update the version. Although we are not technically
1721 -- semantically dependent on the subunit, given our
1722 -- approach of macro substitution of subunits, it makes
1723 -- sense to include it in the version identification.
1725 Version_Update (Cunit (Main_Unit), Comp_Unit);
1731 -- The remaining case is when the subunit is not already loaded and
1732 -- we are not generating code. In this case we are just performing
1733 -- semantic analysis on the parent, and we are not interested in
1734 -- the subunit. For subprograms, analyze the stub as a body. For
1735 -- other entities the stub has already been marked as completed.
1741 end Analyze_Proper_Body;
1743 ----------------------------------
1744 -- Analyze_Protected_Body_Stub --
1745 ----------------------------------
1747 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1748 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1751 Check_Stub_Level (N);
1753 -- First occurence of name may have been as an incomplete type
1755 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1756 Nam := Full_View (Nam);
1760 or else not Is_Protected_Type (Etype (Nam))
1762 Error_Msg_N ("missing specification for Protected body", N);
1764 Set_Scope (Defining_Entity (N), Current_Scope);
1765 Set_Has_Completion (Etype (Nam));
1766 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1767 Analyze_Proper_Body (N, Etype (Nam));
1769 end Analyze_Protected_Body_Stub;
1771 ----------------------------------
1772 -- Analyze_Subprogram_Body_Stub --
1773 ----------------------------------
1775 -- A subprogram body stub can appear with or without a previous
1776 -- specification. If there is one, the analysis of the body will
1777 -- find it and verify conformance. The formals appearing in the
1778 -- specification of the stub play no role, except for requiring an
1779 -- additional conformance check. If there is no previous subprogram
1780 -- declaration, the stub acts as a spec, and provides the defining
1781 -- entity for the subprogram.
1783 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1787 Check_Stub_Level (N);
1789 -- Verify that the identifier for the stub is unique within this
1790 -- declarative part.
1792 if Nkind (Parent (N)) = N_Block_Statement
1793 or else Nkind (Parent (N)) = N_Package_Body
1794 or else Nkind (Parent (N)) = N_Subprogram_Body
1796 Decl := First (Declarations (Parent (N)));
1797 while Present (Decl)
1800 if Nkind (Decl) = N_Subprogram_Body_Stub
1801 and then (Chars (Defining_Unit_Name (Specification (Decl)))
1802 = Chars (Defining_Unit_Name (Specification (N))))
1804 Error_Msg_N ("identifier for stub is not unique", N);
1811 -- Treat stub as a body, which checks conformance if there is a previous
1812 -- declaration, or else introduces entity and its signature.
1814 Analyze_Subprogram_Body (N);
1815 Analyze_Proper_Body (N, Empty);
1816 end Analyze_Subprogram_Body_Stub;
1818 ---------------------
1819 -- Analyze_Subunit --
1820 ---------------------
1822 -- A subunit is compiled either by itself (for semantic checking)
1823 -- or as part of compiling the parent (for code generation). In
1824 -- either case, by the time we actually process the subunit, the
1825 -- parent has already been installed and analyzed. The node N is
1826 -- a compilation unit, whose context needs to be treated here,
1827 -- because we come directly here from the parent without calling
1828 -- Analyze_Compilation_Unit.
1830 -- The compilation context includes the explicit context of the
1831 -- subunit, and the context of the parent, together with the parent
1832 -- itself. In order to compile the current context, we remove the
1833 -- one inherited from the parent, in order to have a clean visibility
1834 -- table. We restore the parent context before analyzing the proper
1835 -- body itself. On exit, we remove only the explicit context of the
1838 procedure Analyze_Subunit (N : Node_Id) is
1839 Lib_Unit : constant Node_Id := Library_Unit (N);
1840 Par_Unit : constant Entity_Id := Current_Scope;
1842 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1843 Num_Scopes : Int := 0;
1844 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1845 Enclosing_Child : Entity_Id := Empty;
1846 Svg : constant Suppress_Array := Scope_Suppress;
1848 procedure Analyze_Subunit_Context;
1849 -- Capture names in use clauses of the subunit. This must be done
1850 -- before re-installing parent declarations, because items in the
1851 -- context must not be hidden by declarations local to the parent.
1853 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1854 -- Recursive procedure to restore scope of all ancestors of subunit,
1855 -- from outermost in. If parent is not a subunit, the call to install
1856 -- context installs context of spec and (if parent is a child unit)
1857 -- the context of its parents as well. It is confusing that parents
1858 -- should be treated differently in both cases, but the semantics are
1859 -- just not identical.
1861 procedure Re_Install_Use_Clauses;
1862 -- As part of the removal of the parent scope, the use clauses are
1863 -- removed, to be reinstalled when the context of the subunit has
1864 -- been analyzed. Use clauses may also have been affected by the
1865 -- analysis of the context of the subunit, so they have to be applied
1866 -- again, to insure that the compilation environment of the rest of
1867 -- the parent unit is identical.
1869 procedure Remove_Scope;
1870 -- Remove current scope from scope stack, and preserve the list
1871 -- of use clauses in it, to be reinstalled after context is analyzed.
1873 -----------------------------
1874 -- Analyze_Subunit_Context --
1875 -----------------------------
1877 procedure Analyze_Subunit_Context is
1880 Unit_Name : Entity_Id;
1883 Analyze_Context (N);
1885 -- Make withed units immediately visible. If child unit, make the
1886 -- ultimate parent immediately visible.
1888 Item := First (Context_Items (N));
1889 while Present (Item) loop
1890 if Nkind (Item) = N_With_Clause then
1892 -- Protect frontend against previous errors in context clauses
1894 if Nkind (Name (Item)) /= N_Selected_Component then
1895 Unit_Name := Entity (Name (Item));
1896 while Is_Child_Unit (Unit_Name) loop
1897 Set_Is_Visible_Child_Unit (Unit_Name);
1898 Unit_Name := Scope (Unit_Name);
1901 if not Is_Immediately_Visible (Unit_Name) then
1902 Set_Is_Immediately_Visible (Unit_Name);
1903 Set_Context_Installed (Item);
1907 elsif Nkind (Item) = N_Use_Package_Clause then
1908 Nam := First (Names (Item));
1909 while Present (Nam) loop
1914 elsif Nkind (Item) = N_Use_Type_Clause then
1915 Nam := First (Subtype_Marks (Item));
1916 while Present (Nam) loop
1925 -- Reset visibility of withed units. They will be made visible
1926 -- again when we install the subunit context.
1928 Item := First (Context_Items (N));
1929 while Present (Item) loop
1930 if Nkind (Item) = N_With_Clause
1932 -- Protect frontend against previous errors in context clauses
1934 and then Nkind (Name (Item)) /= N_Selected_Component
1936 Unit_Name := Entity (Name (Item));
1937 while Is_Child_Unit (Unit_Name) loop
1938 Set_Is_Visible_Child_Unit (Unit_Name, False);
1939 Unit_Name := Scope (Unit_Name);
1942 if Context_Installed (Item) then
1943 Set_Is_Immediately_Visible (Unit_Name, False);
1944 Set_Context_Installed (Item, False);
1950 end Analyze_Subunit_Context;
1952 ------------------------
1953 -- Re_Install_Parents --
1954 ------------------------
1956 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
1960 if Nkind (Unit (L)) = N_Subunit then
1961 Re_Install_Parents (Library_Unit (L), Scope (Scop));
1964 Install_Context (L);
1966 -- If the subunit occurs within a child unit, we must restore the
1967 -- immediate visibility of any siblings that may occur in context.
1969 if Present (Enclosing_Child) then
1970 Install_Siblings (Enclosing_Child, L);
1975 if Scop /= Par_Unit then
1976 Set_Is_Immediately_Visible (Scop);
1979 -- Make entities in scope visible again. For child units, restore
1980 -- visibility only if they are actually in context.
1982 E := First_Entity (Current_Scope);
1983 while Present (E) loop
1984 if not Is_Child_Unit (E)
1985 or else Is_Visible_Child_Unit (E)
1987 Set_Is_Immediately_Visible (E);
1993 -- A subunit appears within a body, and for a nested subunits
1994 -- all the parents are bodies. Restore full visibility of their
1995 -- private entities.
1997 if Ekind (Scop) = E_Package
1998 or else Ekind (Scop) = E_Generic_Package
2000 Set_In_Package_Body (Scop);
2001 Install_Private_Declarations (Scop);
2003 end Re_Install_Parents;
2005 ----------------------------
2006 -- Re_Install_Use_Clauses --
2007 ----------------------------
2009 procedure Re_Install_Use_Clauses is
2012 for J in reverse 1 .. Num_Scopes loop
2013 U := Use_Clauses (J);
2014 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2015 Install_Use_Clauses (U, Force_Installation => True);
2017 end Re_Install_Use_Clauses;
2023 procedure Remove_Scope is
2027 Num_Scopes := Num_Scopes + 1;
2028 Use_Clauses (Num_Scopes) :=
2029 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2031 E := First_Entity (Current_Scope);
2032 while Present (E) loop
2033 Set_Is_Immediately_Visible (E, False);
2037 if Is_Child_Unit (Current_Scope) then
2038 Enclosing_Child := Current_Scope;
2044 -- Start of processing for Analyze_Subunit
2047 if not Is_Empty_List (Context_Items (N)) then
2049 -- Save current use clauses
2052 Remove_Context (Lib_Unit);
2054 -- Now remove parents and their context, including enclosing
2055 -- subunits and the outer parent body which is not a subunit.
2057 if Present (Lib_Spec) then
2058 Remove_Context (Lib_Spec);
2060 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2061 Lib_Spec := Library_Unit (Lib_Spec);
2063 Remove_Context (Lib_Spec);
2066 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2070 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2071 Remove_Context (Library_Unit (Lib_Spec));
2075 Set_Is_Immediately_Visible (Par_Unit, False);
2077 Analyze_Subunit_Context;
2079 Re_Install_Parents (Lib_Unit, Par_Unit);
2080 Set_Is_Immediately_Visible (Par_Unit);
2082 -- If the context includes a child unit of the parent of the
2083 -- subunit, the parent will have been removed from visibility,
2084 -- after compiling that cousin in the context. The visibility
2085 -- of the parent must be restored now. This also applies if the
2086 -- context includes another subunit of the same parent which in
2087 -- turn includes a child unit in its context.
2089 if Ekind (Par_Unit) = E_Package
2090 or else Ekind (Par_Unit) = E_Generic_Package
2092 if not Is_Immediately_Visible (Par_Unit)
2093 or else (Present (First_Entity (Par_Unit))
2094 and then not Is_Immediately_Visible
2095 (First_Entity (Par_Unit)))
2097 Set_Is_Immediately_Visible (Par_Unit);
2098 Install_Visible_Declarations (Par_Unit);
2099 Install_Private_Declarations (Par_Unit);
2103 Re_Install_Use_Clauses;
2104 Install_Context (N);
2106 -- Restore state of suppress flags for current body
2108 Scope_Suppress := Svg;
2110 -- If the subunit is within a child unit, then siblings of any
2111 -- parent unit that appear in the context clause of the subunit
2112 -- must also be made immediately visible.
2114 if Present (Enclosing_Child) then
2115 Install_Siblings (Enclosing_Child, N);
2120 Analyze (Proper_Body (Unit (N)));
2123 -- The subunit may contain a with_clause on a sibling of some
2124 -- ancestor. Removing the context will remove from visibility those
2125 -- ancestor child units, which must be restored to the visibility
2126 -- they have in the enclosing body.
2128 if Present (Enclosing_Child) then
2134 and then Is_Child_Unit (C)
2136 Set_Is_Immediately_Visible (C);
2137 Set_Is_Visible_Child_Unit (C);
2142 end Analyze_Subunit;
2144 ----------------------------
2145 -- Analyze_Task_Body_Stub --
2146 ----------------------------
2148 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2149 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2150 Loc : constant Source_Ptr := Sloc (N);
2153 Check_Stub_Level (N);
2155 -- First occurence of name may have been as an incomplete type
2157 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2158 Nam := Full_View (Nam);
2162 or else not Is_Task_Type (Etype (Nam))
2164 Error_Msg_N ("missing specification for task body", N);
2166 Set_Scope (Defining_Entity (N), Current_Scope);
2167 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2168 Set_Has_Completion (Etype (Nam));
2169 Analyze_Proper_Body (N, Etype (Nam));
2171 -- Set elaboration flag to indicate that entity is callable.
2172 -- This cannot be done in the expansion of the body itself,
2173 -- because the proper body is not in a declarative part. This
2174 -- is only done if expansion is active, because the context
2175 -- may be generic and the flag not defined yet.
2177 if Expander_Active then
2179 Make_Assignment_Statement (Loc,
2181 Make_Identifier (Loc,
2182 New_External_Name (Chars (Etype (Nam)), 'E')),
2183 Expression => New_Reference_To (Standard_True, Loc)));
2187 end Analyze_Task_Body_Stub;
2189 -------------------------
2190 -- Analyze_With_Clause --
2191 -------------------------
2193 -- Analyze the declaration of a unit in a with clause. At end,
2194 -- label the with clause with the defining entity for the unit.
2196 procedure Analyze_With_Clause (N : Node_Id) is
2198 -- Retrieve the original kind of the unit node, before analysis.
2199 -- If it is a subprogram instantiation, its analysis below will
2200 -- rewrite as the declaration of the wrapper package. If the same
2201 -- instantiation appears indirectly elsewhere in the context, it
2202 -- will have been analyzed already.
2204 Unit_Kind : constant Node_Kind :=
2205 Nkind (Original_Node (Unit (Library_Unit (N))));
2206 Nam : constant Node_Id := Name (N);
2208 Par_Name : Entity_Id;
2213 -- Set True if the unit currently being compiled is an internal unit
2215 Save_Style_Check : constant Boolean := Opt.Style_Check;
2216 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
2217 Cunit_Boolean_Restrictions_Save;
2220 if Limited_Present (N) then
2222 -- Ada 2005 (AI-50217): Build visibility structures but do not
2225 Build_Limited_Views (N);
2229 -- We reset ordinary style checking during the analysis of a with'ed
2230 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2231 -- definitely *does* apply to with'ed units).
2233 if not GNAT_Mode then
2234 Style_Check := False;
2237 -- If the library unit is a predefined unit, and we are in high
2238 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2239 -- for the analysis of the with'ed unit. This mode does not prevent
2240 -- explicit with'ing of run-time units.
2242 if Configurable_Run_Time_Mode
2244 Is_Predefined_File_Name
2245 (Unit_File_Name (Get_Source_Unit (Unit (Library_Unit (N)))))
2247 Configurable_Run_Time_Mode := False;
2248 Semantics (Library_Unit (N));
2249 Configurable_Run_Time_Mode := True;
2252 Semantics (Library_Unit (N));
2255 U := Unit (Library_Unit (N));
2256 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2258 -- Following checks are skipped for dummy packages (those supplied for
2259 -- with's where no matching file could be found). Such packages are
2260 -- identified by the Sloc value being set to No_Location
2262 if Sloc (U) /= No_Location then
2264 -- Check restrictions, except that we skip the check if this is an
2265 -- internal unit unless we are compiling the internal unit as the
2266 -- main unit. We also skip this for dummy packages.
2268 Check_Restriction_No_Dependence (Nam, N);
2270 if not Intunit or else Current_Sem_Unit = Main_Unit then
2271 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2274 -- Deal with special case of GNAT.Current_Exceptions which interacts
2275 -- with the optimization of local raise statements into gotos.
2277 if Nkind (Nam) = N_Selected_Component
2278 and then Nkind (Prefix (Nam)) = N_Identifier
2279 and then Chars (Prefix (Nam)) = Name_Gnat
2280 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2282 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2284 Check_Restriction (No_Exception_Propagation, N);
2285 Special_Exception_Package_Used := True;
2288 -- Check for inappropriate with of internal implementation unit if we
2289 -- are currently compiling the main unit and the main unit is itself
2290 -- not an internal unit. We do not issue this message for implicit
2291 -- with's generated by the compiler itself.
2293 if Implementation_Unit_Warnings
2294 and then Current_Sem_Unit = Main_Unit
2295 and then not Intunit
2296 and then not Implicit_With (N)
2297 and then not GNAT_Mode
2300 U_Kind : constant Kind_Of_Unit :=
2301 Get_Kind_Of_Unit (Get_Source_Unit (U));
2304 if U_Kind = Implementation_Unit then
2305 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2307 ("\use of this unit is non-portable " &
2308 "and version-dependent?",
2311 elsif U_Kind = Ada_05_Unit
2312 and then Ada_Version < Ada_05
2313 and then Warn_On_Ada_2005_Compatibility
2315 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2321 -- Semantic analysis of a generic unit is performed on a copy of
2322 -- the original tree. Retrieve the entity on which semantic info
2323 -- actually appears.
2325 if Unit_Kind in N_Generic_Declaration then
2326 E_Name := Defining_Entity (U);
2328 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2329 -- the case of an instantiation, semantic analysis above will have
2330 -- replaced the unit by its instantiated version. If the instance body
2331 -- has been generated, the instance now denotes the body entity. For
2332 -- visibility purposes we need the entity of its spec.
2334 elsif (Unit_Kind = N_Package_Instantiation
2335 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2336 N_Package_Instantiation)
2337 and then Nkind (U) = N_Package_Body
2339 E_Name := Corresponding_Spec (U);
2341 elsif Unit_Kind = N_Package_Instantiation
2342 and then Nkind (U) = N_Package_Instantiation
2344 -- If the instance has not been rewritten as a package declaration,
2345 -- then it appeared already in a previous with clause. Retrieve
2346 -- the entity from the previous instance.
2348 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2350 elsif Unit_Kind in N_Subprogram_Instantiation then
2352 -- Instantiation node is replaced with a wrapper package. Retrieve
2353 -- the visible subprogram created by the instance from corresponding
2354 -- attribute of the wrapper.
2356 E_Name := Related_Instance (Defining_Entity (U));
2358 elsif Unit_Kind = N_Package_Renaming_Declaration
2359 or else Unit_Kind in N_Generic_Renaming_Declaration
2361 E_Name := Defining_Entity (U);
2363 elsif Unit_Kind = N_Subprogram_Body
2364 and then Nkind (Name (N)) = N_Selected_Component
2365 and then not Acts_As_Spec (Library_Unit (N))
2367 -- For a child unit that has no spec, one has been created and
2368 -- analyzed. The entity required is that of the spec.
2370 E_Name := Corresponding_Spec (U);
2373 E_Name := Defining_Entity (U);
2376 if Nkind (Name (N)) = N_Selected_Component then
2378 -- Child unit in a with clause
2380 Change_Selected_Component_To_Expanded_Name (Name (N));
2383 -- Restore style checks and restrictions
2385 Style_Check := Save_Style_Check;
2386 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2388 -- Record the reference, but do NOT set the unit as referenced, we want
2389 -- to consider the unit as unreferenced if this is the only reference
2392 Set_Entity_With_Style_Check (Name (N), E_Name);
2393 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2395 if Is_Child_Unit (E_Name) then
2396 Pref := Prefix (Name (N));
2397 Par_Name := Scope (E_Name);
2398 while Nkind (Pref) = N_Selected_Component loop
2399 Change_Selected_Component_To_Expanded_Name (Pref);
2400 Set_Entity_With_Style_Check (Pref, Par_Name);
2402 Generate_Reference (Par_Name, Pref);
2403 Pref := Prefix (Pref);
2405 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2406 -- is set to Standard_Standard, and no attempt should be made to
2407 -- further unwind scopes.
2409 if Par_Name /= Standard_Standard then
2410 Par_Name := Scope (Par_Name);
2414 if Present (Entity (Pref))
2415 and then not Analyzed (Parent (Parent (Entity (Pref))))
2417 -- If the entity is set without its unit being compiled, the
2418 -- original parent is a renaming, and Par_Name is the renamed
2419 -- entity. For visibility purposes, we need the original entity,
2420 -- which must be analyzed now because Load_Unit directly retrieves
2421 -- the renamed unit, and the renaming declaration itself has not
2424 Analyze (Parent (Parent (Entity (Pref))));
2425 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2426 Par_Name := Entity (Pref);
2429 Set_Entity_With_Style_Check (Pref, Par_Name);
2430 Generate_Reference (Par_Name, Pref);
2433 -- If the withed unit is System, and a system extension pragma is
2434 -- present, compile the extension now, rather than waiting for a
2435 -- visibility check on a specific entity.
2437 if Chars (E_Name) = Name_System
2438 and then Scope (E_Name) = Standard_Standard
2439 and then Present (System_Extend_Unit)
2440 and then Present_System_Aux (N)
2442 -- If the extension is not present, an error will have been emitted
2447 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2448 -- to private_with units; they will be made visible later (just before
2449 -- the private part is analyzed)
2451 if Private_Present (N) then
2452 Set_Is_Immediately_Visible (E_Name, False);
2454 end Analyze_With_Clause;
2456 ------------------------------
2457 -- Check_Private_Child_Unit --
2458 ------------------------------
2460 procedure Check_Private_Child_Unit (N : Node_Id) is
2461 Lib_Unit : constant Node_Id := Unit (N);
2463 Curr_Unit : Entity_Id;
2464 Sub_Parent : Node_Id;
2465 Priv_Child : Entity_Id;
2466 Par_Lib : Entity_Id;
2469 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2470 -- Returns true if and only if the library unit is declared with
2471 -- an explicit designation of private.
2473 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2474 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2477 return Private_Present (Comp_Unit);
2478 end Is_Private_Library_Unit;
2480 -- Start of processing for Check_Private_Child_Unit
2483 if Nkind (Lib_Unit) = N_Package_Body
2484 or else Nkind (Lib_Unit) = N_Subprogram_Body
2486 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2487 Par_Lib := Curr_Unit;
2489 elsif Nkind (Lib_Unit) = N_Subunit then
2491 -- The parent is itself a body. The parent entity is to be found in
2492 -- the corresponding spec.
2494 Sub_Parent := Library_Unit (N);
2495 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2497 -- If the parent itself is a subunit, Curr_Unit is the entity
2498 -- of the enclosing body, retrieve the spec entity which is
2499 -- the proper ancestor we need for the following tests.
2501 if Ekind (Curr_Unit) = E_Package_Body then
2502 Curr_Unit := Spec_Entity (Curr_Unit);
2505 Par_Lib := Curr_Unit;
2508 Curr_Unit := Defining_Entity (Lib_Unit);
2510 Par_Lib := Curr_Unit;
2511 Par_Spec := Parent_Spec (Lib_Unit);
2513 if No (Par_Spec) then
2516 Par_Lib := Defining_Entity (Unit (Par_Spec));
2520 -- Loop through context items
2522 Item := First (Context_Items (N));
2523 while Present (Item) loop
2525 -- Ada 2005 (AI-262): Allow private_with of a private child package
2526 -- in public siblings
2528 if Nkind (Item) = N_With_Clause
2529 and then not Implicit_With (Item)
2530 and then Is_Private_Descendant (Entity (Name (Item)))
2532 Priv_Child := Entity (Name (Item));
2535 Curr_Parent : Entity_Id := Par_Lib;
2536 Child_Parent : Entity_Id := Scope (Priv_Child);
2537 Prv_Ancestor : Entity_Id := Child_Parent;
2538 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2541 -- If the child unit is a public child then locate the nearest
2542 -- private ancestor. Child_Parent will then be set to the
2543 -- parent of that ancestor.
2545 if not Is_Private_Library_Unit (Priv_Child) then
2546 while Present (Prv_Ancestor)
2547 and then not Is_Private_Library_Unit (Prv_Ancestor)
2549 Prv_Ancestor := Scope (Prv_Ancestor);
2552 if Present (Prv_Ancestor) then
2553 Child_Parent := Scope (Prv_Ancestor);
2557 while Present (Curr_Parent)
2558 and then Curr_Parent /= Standard_Standard
2559 and then Curr_Parent /= Child_Parent
2562 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2563 Curr_Parent := Scope (Curr_Parent);
2566 if No (Curr_Parent) then
2567 Curr_Parent := Standard_Standard;
2570 if Curr_Parent /= Child_Parent then
2571 if Ekind (Priv_Child) = E_Generic_Package
2572 and then Chars (Priv_Child) in Text_IO_Package_Name
2573 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2576 ("& is a nested package, not a compilation unit",
2577 Name (Item), Priv_Child);
2581 ("unit in with clause is private child unit!", Item);
2583 ("\current unit must also have parent&!",
2584 Item, Child_Parent);
2587 elsif not Curr_Private
2588 and then not Private_Present (Item)
2589 and then Nkind (Lib_Unit) /= N_Package_Body
2590 and then Nkind (Lib_Unit) /= N_Subprogram_Body
2591 and then Nkind (Lib_Unit) /= N_Subunit
2594 ("current unit must also be private descendant of&",
2595 Item, Child_Parent);
2603 end Check_Private_Child_Unit;
2605 ----------------------
2606 -- Check_Stub_Level --
2607 ----------------------
2609 procedure Check_Stub_Level (N : Node_Id) is
2610 Par : constant Node_Id := Parent (N);
2611 Kind : constant Node_Kind := Nkind (Par);
2614 if (Kind = N_Package_Body
2615 or else Kind = N_Subprogram_Body
2616 or else Kind = N_Task_Body
2617 or else Kind = N_Protected_Body)
2618 and then (Nkind (Parent (Par)) = N_Compilation_Unit
2619 or else Nkind (Parent (Par)) = N_Subunit)
2623 -- In an instance, a missing stub appears at any level. A warning
2624 -- message will have been emitted already for the missing file.
2626 elsif not In_Instance then
2627 Error_Msg_N ("stub cannot appear in an inner scope", N);
2629 elsif Expander_Active then
2630 Error_Msg_N ("missing proper body", N);
2632 end Check_Stub_Level;
2634 ------------------------
2635 -- Expand_With_Clause --
2636 ------------------------
2638 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2639 Loc : constant Source_Ptr := Sloc (Nam);
2640 Ent : constant Entity_Id := Entity (Nam);
2644 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2645 -- Comment requireed here ???
2647 ---------------------
2648 -- Build_Unit_Name --
2649 ---------------------
2651 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2655 if Nkind (Nam) = N_Identifier then
2656 return New_Occurrence_Of (Entity (Nam), Loc);
2660 Make_Expanded_Name (Loc,
2661 Chars => Chars (Entity (Nam)),
2662 Prefix => Build_Unit_Name (Prefix (Nam)),
2663 Selector_Name => New_Occurrence_Of (Entity (Nam), Loc));
2664 Set_Entity (Result, Entity (Nam));
2667 end Build_Unit_Name;
2669 -- Start of processing for Expand_With_Clause
2672 New_Nodes_OK := New_Nodes_OK + 1;
2674 Make_With_Clause (Loc, Name => Build_Unit_Name (Nam));
2676 P := Parent (Unit_Declaration_Node (Ent));
2677 Set_Library_Unit (Withn, P);
2678 Set_Corresponding_Spec (Withn, Ent);
2679 Set_First_Name (Withn, True);
2680 Set_Implicit_With (Withn, True);
2682 -- If the unit is a package declaration, a private_with_clause on a
2683 -- child unit implies that the implicit with on the parent is also
2686 if Nkind (Unit (N)) = N_Package_Declaration then
2687 Set_Private_Present (Withn, Private_Present (Item));
2690 Prepend (Withn, Context_Items (N));
2691 Mark_Rewrite_Insertion (Withn);
2692 Install_Withed_Unit (Withn);
2694 if Nkind (Nam) = N_Expanded_Name then
2695 Expand_With_Clause (Item, Prefix (Nam), N);
2698 New_Nodes_OK := New_Nodes_OK - 1;
2699 end Expand_With_Clause;
2701 -----------------------
2702 -- Get_Parent_Entity --
2703 -----------------------
2705 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2707 if Nkind (Unit) = N_Package_Body
2708 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2712 (Specification (Instance_Spec (Original_Node (Unit))));
2714 elsif Nkind (Unit) = N_Package_Instantiation then
2715 return Defining_Entity (Specification (Instance_Spec (Unit)));
2718 return Defining_Entity (Unit);
2720 end Get_Parent_Entity;
2722 -----------------------------
2723 -- Implicit_With_On_Parent --
2724 -----------------------------
2726 procedure Implicit_With_On_Parent
2727 (Child_Unit : Node_Id;
2730 Loc : constant Source_Ptr := Sloc (N);
2731 P : constant Node_Id := Parent_Spec (Child_Unit);
2732 P_Unit : Node_Id := Unit (P);
2733 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
2736 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
2737 -- Build prefix of child unit name. Recurse if needed
2739 function Build_Unit_Name return Node_Id;
2740 -- If the unit is a child unit, build qualified name with all ancestors
2742 -------------------------
2743 -- Build_Ancestor_Name --
2744 -------------------------
2746 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
2747 P_Ref : constant Node_Id :=
2748 New_Reference_To (Defining_Entity (P), Loc);
2749 P_Spec : Node_Id := P;
2752 -- Ancestor may have been rewritten as a package body. Retrieve
2753 -- the original spec to trace earlier ancestors.
2755 if Nkind (P) = N_Package_Body
2756 and then Nkind (Original_Node (P)) = N_Package_Instantiation
2758 P_Spec := Original_Node (P);
2761 if No (Parent_Spec (P_Spec)) then
2765 Make_Selected_Component (Loc,
2766 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
2767 Selector_Name => P_Ref);
2769 end Build_Ancestor_Name;
2771 ---------------------
2772 -- Build_Unit_Name --
2773 ---------------------
2775 function Build_Unit_Name return Node_Id is
2778 if No (Parent_Spec (P_Unit)) then
2779 return New_Reference_To (P_Name, Loc);
2782 Make_Expanded_Name (Loc,
2783 Chars => Chars (P_Name),
2784 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
2785 Selector_Name => New_Reference_To (P_Name, Loc));
2786 Set_Entity (Result, P_Name);
2789 end Build_Unit_Name;
2791 -- Start of processing for Implicit_With_On_Parent
2794 -- The unit of the current compilation may be a package body that
2795 -- replaces an instance node. In this case we need the original instance
2796 -- node to construct the proper parent name.
2798 if Nkind (P_Unit) = N_Package_Body
2799 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
2801 P_Unit := Original_Node (P_Unit);
2804 -- We add the implicit with if the child unit is the current unit being
2805 -- compiled. If the current unit is a body, we do not want to add an
2806 -- implicit_with a second time to the corresponding spec.
2808 if Nkind (Child_Unit) = N_Package_Declaration
2809 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
2814 New_Nodes_OK := New_Nodes_OK + 1;
2815 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
2817 Set_Library_Unit (Withn, P);
2818 Set_Corresponding_Spec (Withn, P_Name);
2819 Set_First_Name (Withn, True);
2820 Set_Implicit_With (Withn, True);
2822 -- Node is placed at the beginning of the context items, so that
2823 -- subsequent use clauses on the parent can be validated.
2825 Prepend (Withn, Context_Items (N));
2826 Mark_Rewrite_Insertion (Withn);
2827 Install_Withed_Unit (Withn);
2829 if Is_Child_Spec (P_Unit) then
2830 Implicit_With_On_Parent (P_Unit, N);
2833 New_Nodes_OK := New_Nodes_OK - 1;
2834 end Implicit_With_On_Parent;
2840 function In_Chain (E : Entity_Id) return Boolean is
2844 H := Current_Entity (E);
2845 while Present (H) loop
2856 ---------------------
2857 -- Install_Context --
2858 ---------------------
2860 procedure Install_Context (N : Node_Id) is
2861 Lib_Unit : constant Node_Id := Unit (N);
2864 Install_Context_Clauses (N);
2866 if Is_Child_Spec (Lib_Unit) then
2867 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
2870 Install_Limited_Context_Clauses (N);
2872 end Install_Context;
2874 -----------------------------
2875 -- Install_Context_Clauses --
2876 -----------------------------
2878 procedure Install_Context_Clauses (N : Node_Id) is
2879 Lib_Unit : constant Node_Id := Unit (N);
2881 Uname_Node : Entity_Id;
2882 Check_Private : Boolean := False;
2883 Decl_Node : Node_Id;
2884 Lib_Parent : Entity_Id;
2887 -- First skip configuration pragmas at the start of the context. They
2888 -- are not technically part of the context clause, but that's where the
2889 -- parser puts them. Note they were analyzed in Analyze_Context.
2891 Item := First (Context_Items (N));
2892 while Present (Item)
2893 and then Nkind (Item) = N_Pragma
2894 and then Chars (Item) in Configuration_Pragma_Names
2899 -- Loop through the actual context clause items. We process everything
2900 -- except Limited_With clauses in this routine. Limited_With clauses
2901 -- are separately installed (see Install_Limited_Context_Clauses).
2903 while Present (Item) loop
2905 -- Case of explicit WITH clause
2907 if Nkind (Item) = N_With_Clause
2908 and then not Implicit_With (Item)
2910 if Limited_Present (Item) then
2912 -- Limited withed units will be installed later
2916 -- If Name (Item) is not an entity name, something is wrong, and
2917 -- this will be detected in due course, for now ignore the item
2919 elsif not Is_Entity_Name (Name (Item)) then
2922 elsif No (Entity (Name (Item))) then
2923 Set_Entity (Name (Item), Any_Id);
2927 Uname_Node := Entity (Name (Item));
2929 if Is_Private_Descendant (Uname_Node) then
2930 Check_Private := True;
2933 Install_Withed_Unit (Item);
2935 Decl_Node := Unit_Declaration_Node (Uname_Node);
2937 -- If the unit is a subprogram instance, it appears nested within
2938 -- a package that carries the parent information.
2940 if Is_Generic_Instance (Uname_Node)
2941 and then Ekind (Uname_Node) /= E_Package
2943 Decl_Node := Parent (Parent (Decl_Node));
2946 if Is_Child_Spec (Decl_Node) then
2947 if Nkind (Name (Item)) = N_Expanded_Name then
2948 Expand_With_Clause (Item, Prefix (Name (Item)), N);
2950 -- if not an expanded name, the child unit must be a
2951 -- renaming, nothing to do.
2956 elsif Nkind (Decl_Node) = N_Subprogram_Body
2957 and then not Acts_As_Spec (Parent (Decl_Node))
2958 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
2960 Implicit_With_On_Parent
2961 (Unit (Library_Unit (Parent (Decl_Node))), N);
2964 -- Check license conditions unless this is a dummy unit
2966 if Sloc (Library_Unit (Item)) /= No_Location then
2967 License_Check : declare
2969 Withu : constant Unit_Number_Type :=
2970 Get_Source_Unit (Library_Unit (Item));
2972 Withl : constant License_Type :=
2973 License (Source_Index (Withu));
2975 Unitl : constant License_Type :=
2976 License (Source_Index (Current_Sem_Unit));
2978 procedure License_Error;
2979 -- Signal error of bad license
2985 procedure License_Error is
2988 ("?license of with'ed unit & may be inconsistent",
2992 -- Start of processing for License_Check
2995 -- Exclude license check if withed unit is an internal unit.
2996 -- This situation arises e.g. with the GPL version of GNAT.
2998 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3001 -- Otherwise check various cases
3013 if Withl = Restricted then
3017 when Modified_GPL =>
3018 if Withl = Restricted or else Withl = GPL then
3022 when Unrestricted =>
3029 -- Case of USE PACKAGE clause
3031 elsif Nkind (Item) = N_Use_Package_Clause then
3032 Analyze_Use_Package (Item);
3034 -- Case of USE TYPE clause
3036 elsif Nkind (Item) = N_Use_Type_Clause then
3037 Analyze_Use_Type (Item);
3041 elsif Nkind (Item) = N_Pragma then
3049 if Is_Child_Spec (Lib_Unit) then
3051 -- The unit also has implicit withs on its own parents
3053 if No (Context_Items (N)) then
3054 Set_Context_Items (N, New_List);
3057 Implicit_With_On_Parent (Lib_Unit, N);
3060 -- If the unit is a body, the context of the specification must also
3063 if Nkind (Lib_Unit) = N_Package_Body
3064 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3065 and then not Acts_As_Spec (N))
3067 Install_Context (Library_Unit (N));
3069 if Is_Child_Spec (Unit (Library_Unit (N))) then
3071 -- If the unit is the body of a public child unit, the private
3072 -- declarations of the parent must be made visible. If the child
3073 -- unit is private, the private declarations have been installed
3074 -- already in the call to Install_Parents for the spec. Installing
3075 -- private declarations must be done for all ancestors of public
3076 -- child units. In addition, sibling units mentioned in the
3077 -- context clause of the body are directly visible.
3085 Lib_Spec := Unit (Library_Unit (N));
3086 while Is_Child_Spec (Lib_Spec) loop
3087 P := Unit (Parent_Spec (Lib_Spec));
3088 P_Name := Defining_Entity (P);
3090 if not (Private_Present (Parent (Lib_Spec)))
3091 and then not In_Private_Part (P_Name)
3093 Install_Private_Declarations (P_Name);
3094 Install_Private_With_Clauses (P_Name);
3095 Set_Use (Private_Declarations (Specification (P)));
3103 -- For a package body, children in context are immediately visible
3105 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3108 if Nkind (Lib_Unit) = N_Generic_Package_Declaration
3109 or else Nkind (Lib_Unit) = N_Generic_Subprogram_Declaration
3110 or else Nkind (Lib_Unit) = N_Package_Declaration
3111 or else Nkind (Lib_Unit) = N_Subprogram_Declaration
3113 if Is_Child_Spec (Lib_Unit) then
3114 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3115 Set_Is_Private_Descendant
3116 (Defining_Entity (Lib_Unit),
3117 Is_Private_Descendant (Lib_Parent)
3118 or else Private_Present (Parent (Lib_Unit)));
3121 Set_Is_Private_Descendant
3122 (Defining_Entity (Lib_Unit),
3123 Private_Present (Parent (Lib_Unit)));
3127 if Check_Private then
3128 Check_Private_Child_Unit (N);
3130 end Install_Context_Clauses;
3132 -------------------------------------
3133 -- Install_Limited_Context_Clauses --
3134 -------------------------------------
3136 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3139 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3140 -- Check that the unlimited view of a given compilation_unit is not
3141 -- already visible through "use + renamings".
3143 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3144 -- Check that if a limited_with clause of a given compilation_unit
3145 -- mentions a descendant of a private child of some library unit,
3146 -- then the given compilation_unit shall be the declaration of a
3147 -- private descendant of that library unit.
3149 procedure Expand_Limited_With_Clause
3150 (Comp_Unit : Node_Id; Nam : Node_Id; N : Node_Id);
3151 -- If a child unit appears in a limited_with clause, there are implicit
3152 -- limited_with clauses on all parents that are not already visible
3153 -- through a regular with clause. This procedure creates the implicit
3154 -- limited with_clauses for the parents and loads the corresponding
3155 -- units. The shadow entities are created when the inserted clause is
3156 -- analyzed. Implements Ada 2005 (AI-50217).
3158 ---------------------
3159 -- Check_Renamings --
3160 ---------------------
3162 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3171 pragma Assert (Nkind (W) = N_With_Clause);
3173 -- Protect the frontend against previous critical errors
3175 case Nkind (Unit (Library_Unit (W))) is
3176 when N_Subprogram_Declaration |
3177 N_Package_Declaration |
3178 N_Generic_Subprogram_Declaration |
3179 N_Generic_Package_Declaration =>
3186 -- Check "use + renamings"
3188 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3189 Spec := Specification (Unit (P));
3191 Item := First (Visible_Declarations (Spec));
3192 while Present (Item) loop
3194 -- Look only at use package clauses
3196 if Nkind (Item) = N_Use_Package_Clause then
3198 -- Traverse the list of packages
3200 Nam := First (Names (Item));
3201 while Present (Nam) loop
3204 pragma Assert (Present (Parent (E)));
3206 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3207 and then Renamed_Entity (E) = WEnt
3209 -- The unlimited view is visible through use clause and
3210 -- renamings. There is not need to generate the error
3211 -- message here because Is_Visible_Through_Renamings
3212 -- takes care of generating the precise error message.
3216 elsif Nkind (Parent (E)) = N_Package_Specification then
3218 -- The use clause may refer to a local package.
3219 -- Check all the enclosing scopes.
3222 while E2 /= Standard_Standard
3223 and then E2 /= WEnt loop
3229 ("unlimited view visible through use clause ", W);
3241 -- Recursive call to check all the ancestors
3243 if Is_Child_Spec (Unit (P)) then
3244 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3246 end Check_Renamings;
3248 ---------------------------------------
3249 -- Check_Private_Limited_Withed_Unit --
3250 ---------------------------------------
3252 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3253 Curr_Parent : Node_Id;
3254 Child_Parent : Node_Id;
3257 -- Compilation unit of the parent of the withed library unit
3259 Child_Parent := Parent_Spec (Unit (Library_Unit (Item)));
3261 -- If the child unit is a public child, then locate its nearest
3262 -- private ancestor, if any; Child_Parent will then be set to
3263 -- the parent of that ancestor.
3265 if not Private_Present (Library_Unit (Item)) then
3266 while Present (Child_Parent)
3267 and then not Private_Present (Child_Parent)
3269 Child_Parent := Parent_Spec (Unit (Child_Parent));
3272 if No (Child_Parent) then
3276 Child_Parent := Parent_Spec (Unit (Child_Parent));
3279 -- Traverse all the ancestors of the current compilation
3280 -- unit to check if it is a descendant of named library unit.
3282 Curr_Parent := Parent (Item);
3283 while Present (Parent_Spec (Unit (Curr_Parent)))
3284 and then Curr_Parent /= Child_Parent
3286 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3289 if Curr_Parent /= Child_Parent then
3291 ("unit in with clause is private child unit!", Item);
3293 ("\current unit must also have parent&!",
3294 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3296 elsif not Private_Present (Parent (Item))
3297 and then not Private_Present (Item)
3298 and then Nkind (Unit (Parent (Item))) /= N_Package_Body
3299 and then Nkind (Unit (Parent (Item))) /= N_Subprogram_Body
3300 and then Nkind (Unit (Parent (Item))) /= N_Subunit
3303 ("current unit must also be private descendant of&",
3304 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3306 end Check_Private_Limited_Withed_Unit;
3308 --------------------------------
3309 -- Expand_Limited_With_Clause --
3310 --------------------------------
3312 procedure Expand_Limited_With_Clause
3313 (Comp_Unit : Node_Id;
3317 Loc : constant Source_Ptr := Sloc (Nam);
3318 Unum : Unit_Number_Type;
3321 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3322 -- Returns true if the context already includes a with_clause for
3323 -- this unit. If the with_clause is non-limited, the unit is fully
3324 -- visible and an implicit limited_with should not be created. If
3325 -- there is already a limited_with clause for W, a second one is
3326 -- simply redundant.
3328 --------------------------
3329 -- Previous_Withed_Unit --
3330 --------------------------
3332 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3336 -- A limited with_clause cannot appear in the same context_clause
3337 -- as a nonlimited with_clause which mentions the same library.
3339 Item := First (Context_Items (Comp_Unit));
3340 while Present (Item) loop
3341 if Nkind (Item) = N_With_Clause
3342 and then Library_Unit (Item) = Library_Unit (W)
3351 end Previous_Withed_Unit;
3353 -- Start of processing for Expand_Limited_With_Clause
3356 New_Nodes_OK := New_Nodes_OK + 1;
3358 if Nkind (Nam) = N_Identifier then
3360 -- Create node for name of withed unit
3363 Make_With_Clause (Loc,
3364 Name => New_Copy (Nam));
3366 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3368 Make_With_Clause (Loc,
3369 Name => Make_Selected_Component (Loc,
3370 Prefix => New_Copy_Tree (Prefix (Nam)),
3371 Selector_Name => New_Copy (Selector_Name (Nam))));
3372 Set_Parent (Withn, Parent (N));
3375 Set_Limited_Present (Withn);
3376 Set_First_Name (Withn);
3377 Set_Implicit_With (Withn);
3381 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3386 -- Do not generate a limited_with_clause on the current unit.
3387 -- This path is taken when a unit has a limited_with clause on
3388 -- one of its child units.
3390 if Unum = Current_Sem_Unit then
3394 Set_Library_Unit (Withn, Cunit (Unum));
3395 Set_Corresponding_Spec
3396 (Withn, Specification (Unit (Cunit (Unum))));
3398 if not Previous_Withed_Unit (Withn) then
3399 Prepend (Withn, Context_Items (Parent (N)));
3400 Mark_Rewrite_Insertion (Withn);
3402 -- Add implicit limited_with_clauses for parents of child units
3403 -- mentioned in limited_with clauses.
3405 if Nkind (Nam) = N_Selected_Component then
3406 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3411 if not Limited_View_Installed (Withn) then
3412 Install_Limited_Withed_Unit (Withn);
3416 New_Nodes_OK := New_Nodes_OK - 1;
3417 end Expand_Limited_With_Clause;
3419 -- Start of processing for Install_Limited_Context_Clauses
3422 Item := First (Context_Items (N));
3423 while Present (Item) loop
3424 if Nkind (Item) = N_With_Clause
3425 and then Limited_Present (Item)
3427 if Nkind (Name (Item)) = N_Selected_Component then
3428 Expand_Limited_With_Clause
3429 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3432 Check_Private_Limited_Withed_Unit (Item);
3434 if not Implicit_With (Item)
3435 and then Is_Child_Spec (Unit (N))
3437 Check_Renamings (Parent_Spec (Unit (N)), Item);
3440 -- A unit may have a limited with on itself if it has a limited
3441 -- with_clause on one of its child units. In that case it is
3442 -- already being compiled and it makes no sense to install its
3445 -- If the item is a limited_private_with_clause, install it if the
3446 -- current unit is a body or if it is a private child. Otherwise
3447 -- the private clause is installed before analyzing the private
3448 -- part of the current unit.
3450 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3451 and then not Limited_View_Installed (Item)
3453 if not Private_Present (Item)
3454 or else Private_Present (N)
3455 or else Nkind (Unit (N)) = N_Package_Body
3456 or else Nkind (Unit (N)) = N_Subprogram_Body
3457 or else Nkind (Unit (N)) = N_Subunit
3459 Install_Limited_Withed_Unit (Item);
3463 -- All items other than Limited_With clauses are ignored (they were
3464 -- installed separately early on by Install_Context_Clause).
3473 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3474 -- spec, looking for incomplete subtype declarations of incomplete
3475 -- types visible through a limited with clause.
3477 if Ada_Version >= Ada_05
3478 and then Analyzed (N)
3479 and then Nkind (Unit (N)) = N_Package_Declaration
3484 Non_Lim_View : Entity_Id;
3487 Decl := First (Visible_Declarations (Specification (Unit (N))));
3488 while Present (Decl) loop
3489 if Nkind (Decl) = N_Subtype_Declaration
3491 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3493 From_With_Type (Defining_Identifier (Decl))
3495 Def_Id := Defining_Identifier (Decl);
3496 Non_Lim_View := Non_Limited_View (Def_Id);
3498 if not Is_Incomplete_Type (Non_Lim_View) then
3500 -- Convert an incomplete subtype declaration into a
3501 -- corresponding non-limited view subtype declaration.
3502 -- This is usually the case when analyzing a body that
3503 -- has regular with-clauses, when the spec has limited
3506 -- If the non-limited view is still incomplete, it is
3507 -- the dummy entry already created, and the declaration
3508 -- cannot be reanalyzed. This is the case when installing
3509 -- a parent unit that has limited with-clauses.
3511 Set_Subtype_Indication (Decl,
3512 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3513 Set_Etype (Def_Id, Non_Lim_View);
3514 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3515 Set_Analyzed (Decl, False);
3517 -- Reanalyze the declaration, suppressing the call to
3518 -- Enter_Name to avoid duplicate names.
3520 Analyze_Subtype_Declaration
3530 end Install_Limited_Context_Clauses;
3532 ---------------------
3533 -- Install_Parents --
3534 ---------------------
3536 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3543 P := Unit (Parent_Spec (Lib_Unit));
3544 P_Name := Get_Parent_Entity (P);
3546 if Etype (P_Name) = Any_Type then
3550 if Ekind (P_Name) = E_Generic_Package
3551 and then Nkind (Lib_Unit) /= N_Generic_Subprogram_Declaration
3552 and then Nkind (Lib_Unit) /= N_Generic_Package_Declaration
3553 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3556 ("child of a generic package must be a generic unit", Lib_Unit);
3558 elsif not Is_Package_Or_Generic_Package (P_Name) then
3560 ("parent unit must be package or generic package", Lib_Unit);
3561 raise Unrecoverable_Error;
3563 elsif Present (Renamed_Object (P_Name)) then
3564 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3565 raise Unrecoverable_Error;
3567 -- Verify that a child of an instance is itself an instance, or the
3568 -- renaming of one. Given that an instance that is a unit is replaced
3569 -- with a package declaration, check against the original node. The
3570 -- parent may be currently being instantiated, in which case it appears
3571 -- as a declaration, but the generic_parent is already established
3572 -- indicating that we deal with an instance.
3574 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3576 if Nkind (Lib_Unit) in N_Renaming_Declaration
3577 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3579 (Nkind (Lib_Unit) = N_Package_Declaration
3580 and then Present (Generic_Parent (Specification (Lib_Unit))))
3585 ("child of an instance must be an instance or renaming",
3590 -- This is the recursive call that ensures all parents are loaded
3592 if Is_Child_Spec (P) then
3594 Is_Private or else Private_Present (Parent (Lib_Unit)));
3597 -- Now we can install the context for this parent
3599 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3600 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3601 Install_Siblings (P_Name, Parent (Lib_Unit));
3603 -- The child unit is in the declarative region of the parent. The parent
3604 -- must therefore appear in the scope stack and be visible, as when
3605 -- compiling the corresponding body. If the child unit is private or it
3606 -- is a package body, private declarations must be accessible as well.
3607 -- Use declarations in the parent must also be installed. Finally, other
3608 -- child units of the same parent that are in the context are
3609 -- immediately visible.
3611 -- Find entity for compilation unit, and set its private descendant
3612 -- status as needed.
3614 E_Name := Defining_Entity (Lib_Unit);
3616 Set_Is_Child_Unit (E_Name);
3618 Set_Is_Private_Descendant (E_Name,
3619 Is_Private_Descendant (P_Name)
3620 or else Private_Present (Parent (Lib_Unit)));
3622 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3623 Push_Scope (P_Name);
3625 -- Save current visibility of unit
3627 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3628 Is_Immediately_Visible (P_Name);
3629 Set_Is_Immediately_Visible (P_Name);
3630 Install_Visible_Declarations (P_Name);
3631 Set_Use (Visible_Declarations (P_Spec));
3633 -- If the parent is a generic unit, its formal part may contain formal
3634 -- packages and use clauses for them.
3636 if Ekind (P_Name) = E_Generic_Package then
3637 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3641 or else Private_Present (Parent (Lib_Unit))
3643 Install_Private_Declarations (P_Name);
3644 Install_Private_With_Clauses (P_Name);
3645 Set_Use (Private_Declarations (P_Spec));
3647 end Install_Parents;
3649 ----------------------------------
3650 -- Install_Private_With_Clauses --
3651 ----------------------------------
3653 procedure Install_Private_With_Clauses (P : Entity_Id) is
3654 Decl : constant Node_Id := Unit_Declaration_Node (P);
3658 if Debug_Flag_I then
3659 Write_Str ("install private with clauses of ");
3660 Write_Name (Chars (P));
3664 if Nkind (Parent (Decl)) = N_Compilation_Unit then
3665 Item := First (Context_Items (Parent (Decl)));
3666 while Present (Item) loop
3667 if Nkind (Item) = N_With_Clause
3668 and then Private_Present (Item)
3670 if Limited_Present (Item) then
3671 if not Limited_View_Installed (Item) then
3672 Install_Limited_Withed_Unit (Item);
3675 Install_Withed_Unit (Item, Private_With_OK => True);
3682 end Install_Private_With_Clauses;
3684 ----------------------
3685 -- Install_Siblings --
3686 ----------------------
3688 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
3693 -- Iterate over explicit with clauses, and check whether the scope of
3694 -- each entity is an ancestor of the current unit, in which case it is
3695 -- immediately visible.
3697 Item := First (Context_Items (N));
3698 while Present (Item) loop
3700 -- Do not install private_with_clauses if the unit is a package
3701 -- declaration, unless it is itself a private child unit.
3703 if Nkind (Item) = N_With_Clause
3704 and then not Implicit_With (Item)
3705 and then not Limited_Present (Item)
3707 (not Private_Present (Item)
3708 or else Nkind (Unit (N)) /= N_Package_Declaration
3709 or else Private_Present (N))
3711 Id := Entity (Name (Item));
3713 if Is_Child_Unit (Id)
3714 and then Is_Ancestor_Package (Scope (Id), U_Name)
3716 Set_Is_Immediately_Visible (Id);
3718 -- Check for the presence of another unit in the context,
3719 -- that may be inadvertently hidden by the child.
3721 Prev := Current_Entity (Id);
3724 and then Is_Immediately_Visible (Prev)
3725 and then not Is_Child_Unit (Prev)
3731 Clause := First (Context_Items (N));
3732 while Present (Clause) loop
3733 if Nkind (Clause) = N_With_Clause
3734 and then Entity (Name (Clause)) = Prev
3737 ("child unit& hides compilation unit " &
3738 "with the same name?",
3748 -- The With_Clause may be on a grand-child or one of its further
3749 -- descendants, which makes a child immediately visible. Examine
3750 -- ancestry to determine whether such a child exists. For example,
3751 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
3752 -- is immediately visible.
3754 elsif Is_Child_Unit (Id) then
3760 while Is_Child_Unit (Par) loop
3761 if Is_Ancestor_Package (Scope (Par), U_Name) then
3762 Set_Is_Immediately_Visible (Par);
3774 end Install_Siblings;
3776 -------------------------------
3777 -- Install_Limited_With_Unit --
3778 -------------------------------
3780 procedure Install_Limited_Withed_Unit (N : Node_Id) is
3781 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
3784 Is_Child_Package : Boolean := False;
3786 Lim_Header : Entity_Id;
3787 Lim_Typ : Entity_Id;
3789 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
3790 -- Check if some package installed though normal with-clauses has a
3791 -- renaming declaration of package P. AARM 10.1.2(21/2).
3793 ----------------------------------
3794 -- Is_Visible_Through_Renamings --
3795 ----------------------------------
3797 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
3798 Kind : constant Node_Kind :=
3799 Nkind (Unit (Cunit (Current_Sem_Unit)));
3805 -- Example of the error detected by this subprogram:
3813 -- package Ren_P renames P;
3819 -- limited with P; -- ERROR
3820 -- package R.C is ...
3822 Aux_Unit := Cunit (Current_Sem_Unit);
3825 Item := First (Context_Items (Aux_Unit));
3826 while Present (Item) loop
3827 if Nkind (Item) = N_With_Clause
3828 and then not Limited_Present (Item)
3829 and then Nkind (Unit (Library_Unit (Item)))
3830 = N_Package_Declaration
3833 First (Visible_Declarations
3834 (Specification (Unit (Library_Unit (Item)))));
3835 while Present (Decl) loop
3836 if Nkind (Decl) = N_Package_Renaming_Declaration
3837 and then Entity (Name (Decl)) = P
3839 -- Generate the error message only if the current unit
3840 -- is a package declaration; in case of subprogram
3841 -- bodies and package bodies we just return true to
3842 -- indicate that the limited view must not be
3845 if Kind = N_Package_Declaration then
3847 ("simultaneous visibility of the limited and " &
3848 "unlimited views not allowed", N);
3849 Error_Msg_Sloc := Sloc (Item);
3851 ("\\ unlimited view of & visible through the " &
3852 "context clause #", N, P);
3853 Error_Msg_Sloc := Sloc (Decl);
3854 Error_Msg_NE ("\\ and the renaming #", N, P);
3867 if Present (Library_Unit (Aux_Unit)) then
3868 if Aux_Unit = Library_Unit (Aux_Unit) then
3870 -- Aux_Unit is a body that acts as a spec. Clause has
3871 -- already been flagged as illegal.
3876 Aux_Unit := Library_Unit (Aux_Unit);
3879 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
3882 exit when No (Aux_Unit);
3886 end Is_Visible_Through_Renamings;
3888 -- Start of processing for Install_Limited_Withed_Unit
3891 pragma Assert (not Limited_View_Installed (N));
3893 -- In case of limited with_clause on subprograms, generics, instances,
3894 -- or renamings, the corresponding error was previously posted and we
3895 -- have nothing to do here.
3897 if Nkind (P_Unit) /= N_Package_Declaration then
3901 P := Defining_Unit_Name (Specification (P_Unit));
3903 -- Handle child packages
3905 if Nkind (P) = N_Defining_Program_Unit_Name then
3906 Is_Child_Package := True;
3907 P := Defining_Identifier (P);
3910 -- Do not install the limited-view if the full-view is already visible
3911 -- through renaming declarations.
3913 if Is_Visible_Through_Renamings (P) then
3917 -- Do not install the limited view if this is the unit being analyzed.
3918 -- This unusual case will happen when a unit has a limited_with clause
3919 -- on one of its children. The compilation of the child forces the
3920 -- load of the parent which tries to install the limited view of the
3921 -- child again. Installing the limited view must also be disabled
3922 -- when compiling the body of the child unit.
3924 if P = Cunit_Entity (Current_Sem_Unit)
3926 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
3927 and then P = Main_Unit_Entity)
3932 -- A common use of the limited-with is to have a limited-with
3933 -- in the package spec, and a normal with in its package body.
3936 -- limited with X; -- [1]
3940 -- package body A is ...
3942 -- The compilation of A's body installs the context clauses found at [2]
3943 -- and then the context clauses of its specification (found at [1]). As
3944 -- a consequence, at [1] the specification of X has been analyzed and it
3945 -- is immediately visible. According to the semantics of limited-with
3946 -- context clauses we don't install the limited view because the full
3947 -- view of X supersedes its limited view.
3949 if Analyzed (P_Unit)
3950 and then (Is_Immediately_Visible (P)
3951 or else (Is_Child_Package
3952 and then Is_Visible_Child_Unit (P)))
3954 -- Ada 2005 (AI-262): Install the private declarations of P
3956 if Private_Present (N)
3957 and then not In_Private_Part (P)
3963 Id := First_Private_Entity (P);
3964 while Present (Id) loop
3965 if not Is_Internal (Id)
3966 and then not Is_Child_Unit (Id)
3968 if not In_Chain (Id) then
3969 Set_Homonym (Id, Current_Entity (Id));
3970 Set_Current_Entity (Id);
3973 Set_Is_Immediately_Visible (Id);
3979 Set_In_Private_Part (P);
3986 if Debug_Flag_I then
3987 Write_Str ("install limited view of ");
3988 Write_Name (Chars (P));
3992 -- If the unit has not been analyzed and the limited view has not been
3993 -- already installed then we install it.
3995 if not Analyzed (P_Unit) then
3996 if not In_Chain (P) then
3998 -- Minimum decoration
4000 Set_Ekind (P, E_Package);
4001 Set_Etype (P, Standard_Void_Type);
4002 Set_Scope (P, Standard_Standard);
4004 if Is_Child_Package then
4005 Set_Is_Child_Unit (P);
4006 Set_Is_Visible_Child_Unit (P);
4007 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4010 -- Place entity on visibility structure
4012 Set_Homonym (P, Current_Entity (P));
4013 Set_Current_Entity (P);
4015 if Debug_Flag_I then
4016 Write_Str (" (homonym) chain ");
4017 Write_Name (Chars (P));
4021 -- Install the incomplete view. The first element of the limited
4022 -- view is a header (an E_Package entity) used to reference the
4023 -- first shadow entity in the private part of the package.
4025 Lim_Header := Limited_View (P);
4026 Lim_Typ := First_Entity (Lim_Header);
4028 while Present (Lim_Typ)
4029 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4031 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4032 Set_Current_Entity (Lim_Typ);
4034 if Debug_Flag_I then
4035 Write_Str (" (homonym) chain ");
4036 Write_Name (Chars (Lim_Typ));
4040 Next_Entity (Lim_Typ);
4044 -- If the unit appears in a previous regular with_clause, the regular
4045 -- entities of the public part of the withed package must be replaced
4046 -- by the shadow ones.
4048 -- This code must be kept synchronized with the code that replaces the
4049 -- shadow entities by the real entities (see body of Remove_Limited
4050 -- With_Clause); otherwise the contents of the homonym chains are not
4054 -- Hide all the type entities of the public part of the package to
4055 -- avoid its usage. This is needed to cover all the subtype decla-
4056 -- rations because we do not remove them from the homonym chain.
4058 E := First_Entity (P);
4059 while Present (E) and then E /= First_Private_Entity (P) loop
4061 Set_Was_Hidden (E, Is_Hidden (E));
4068 -- Replace the real entities by the shadow entities of the limited
4069 -- view. The first element of the limited view is a header that is
4070 -- used to reference the first shadow entity in the private part
4071 -- of the package. Successive elements are the limited views of the
4072 -- type (including regular incomplete types) declared in the package.
4074 Lim_Header := Limited_View (P);
4076 Lim_Typ := First_Entity (Lim_Header);
4077 while Present (Lim_Typ)
4078 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4080 pragma Assert (not In_Chain (Lim_Typ));
4082 -- Do not unchain nested packages and child units
4084 if Ekind (Lim_Typ) /= E_Package
4085 and then not Is_Child_Unit (Lim_Typ)
4091 Prev := Current_Entity (Lim_Typ);
4094 -- Replace E in the homonyms list, so that the limited
4095 -- view becomes available.
4097 if E = Non_Limited_View (Lim_Typ) then
4098 Set_Homonym (Lim_Typ, Homonym (Prev));
4099 Set_Current_Entity (Lim_Typ);
4103 E := Homonym (Prev);
4105 -- E may have been removed when installing a
4106 -- previous limited_with_clause.
4110 exit when E = Non_Limited_View (Lim_Typ);
4112 Prev := Homonym (Prev);
4116 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4117 Set_Homonym (Prev, Lim_Typ);
4122 if Debug_Flag_I then
4123 Write_Str (" (homonym) chain ");
4124 Write_Name (Chars (Lim_Typ));
4129 Next_Entity (Lim_Typ);
4133 -- The package must be visible while the limited-with clause is active
4134 -- because references to the type P.T must resolve in the usual way.
4135 -- In addition, we remember that the limited-view has been installed to
4136 -- uninstall it at the point of context removal.
4138 Set_Is_Immediately_Visible (P);
4139 Set_Limited_View_Installed (N);
4141 -- If the package in the limited_with clause is a child unit, the
4142 -- clause is unanalyzed and appears as a selected component. Recast
4143 -- it as an expanded name so that the entity can be properly set. Use
4144 -- entity of parent, if available, for higher ancestors in the name.
4146 if Nkind (Name (N)) = N_Selected_Component then
4154 while Nkind (Nam) = N_Selected_Component
4155 and then Present (Ent)
4157 Change_Selected_Component_To_Expanded_Name (Nam);
4159 -- Set entity of parent identifiers if the unit is a child
4160 -- unit. This ensures that the tree is properly formed from
4161 -- semantic point of view (e.g. for ASIS queries).
4163 Set_Entity (Nam, Ent);
4165 Nam := Prefix (Nam);
4168 -- Set entity of last ancestor
4170 if Nkind (Nam) = N_Identifier then
4171 Set_Entity (Nam, Ent);
4177 Set_Entity (Name (N), P);
4178 Set_From_With_Type (P);
4179 end Install_Limited_Withed_Unit;
4181 -------------------------
4182 -- Install_Withed_Unit --
4183 -------------------------
4185 procedure Install_Withed_Unit
4186 (With_Clause : Node_Id;
4187 Private_With_OK : Boolean := False)
4189 Uname : constant Entity_Id := Entity (Name (With_Clause));
4190 P : constant Entity_Id := Scope (Uname);
4193 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4194 -- compiling a package declaration and the Private_With_OK flag was not
4195 -- set by the caller. These declarations will be installed later (before
4196 -- analyzing the private part of the package).
4198 if Private_Present (With_Clause)
4199 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
4200 and then not (Private_With_OK)
4205 if Debug_Flag_I then
4206 if Private_Present (With_Clause) then
4207 Write_Str ("install private withed unit ");
4209 Write_Str ("install withed unit ");
4212 Write_Name (Chars (Uname));
4216 -- We do not apply the restrictions to an internal unit unless
4217 -- we are compiling the internal unit as a main unit. This check
4218 -- is also skipped for dummy units (for missing packages).
4220 if Sloc (Uname) /= No_Location
4221 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
4222 or else Current_Sem_Unit = Main_Unit)
4224 Check_Restricted_Unit
4225 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
4228 if P /= Standard_Standard then
4230 -- If the unit is not analyzed after analysis of the with clause and
4231 -- it is an instantiation then it awaits a body and is the main unit.
4232 -- Its appearance in the context of some other unit indicates a
4233 -- circular dependency (DEC suite perversity).
4235 if not Analyzed (Uname)
4236 and then Nkind (Parent (Uname)) = N_Package_Instantiation
4239 ("instantiation depends on itself", Name (With_Clause));
4241 elsif not Is_Visible_Child_Unit (Uname) then
4242 Set_Is_Visible_Child_Unit (Uname);
4244 -- If the child unit appears in the context of its parent, it is
4245 -- immediately visible.
4247 if In_Open_Scopes (Scope (Uname)) then
4248 Set_Is_Immediately_Visible (Uname);
4251 if Is_Generic_Instance (Uname)
4252 and then Ekind (Uname) in Subprogram_Kind
4254 -- Set flag as well on the visible entity that denotes the
4255 -- instance, which renames the current one.
4257 Set_Is_Visible_Child_Unit
4259 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
4262 -- The parent unit may have been installed already, and may have
4263 -- appeared in a use clause.
4265 if In_Use (Scope (Uname)) then
4266 Set_Is_Potentially_Use_Visible (Uname);
4269 Set_Context_Installed (With_Clause);
4272 elsif not Is_Immediately_Visible (Uname) then
4273 if not Private_Present (With_Clause)
4274 or else Private_With_OK
4276 Set_Is_Immediately_Visible (Uname);
4279 Set_Context_Installed (With_Clause);
4282 -- A with-clause overrides a with-type clause: there are no restric-
4283 -- tions on the use of package entities.
4285 if Ekind (Uname) = E_Package then
4286 Set_From_With_Type (Uname, False);
4289 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4290 -- unit if there is a visible homograph for it declared in the same
4291 -- declarative region. This pathological case can only arise when an
4292 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4293 -- G1 has a generic child also named G2, and the context includes with_
4294 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4295 -- of I1.G2 visible as well. If the child unit is named Standard, do
4296 -- not apply the check to the Standard package itself.
4298 if Is_Child_Unit (Uname)
4299 and then Is_Visible_Child_Unit (Uname)
4300 and then Ada_Version >= Ada_05
4303 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
4309 U2 := Homonym (Uname);
4311 and then U2 /= Standard_Standard
4314 Decl2 := Unit_Declaration_Node (P2);
4316 if Is_Child_Unit (U2)
4317 and then Is_Visible_Child_Unit (U2)
4319 if Is_Generic_Instance (P)
4320 and then Nkind (Decl1) = N_Package_Declaration
4321 and then Generic_Parent (Specification (Decl1)) = P2
4323 Error_Msg_N ("illegal with_clause", With_Clause);
4325 ("\child unit has visible homograph" &
4326 " (RM 8.3(26), 10.1.1(19))",
4330 elsif Is_Generic_Instance (P2)
4331 and then Nkind (Decl2) = N_Package_Declaration
4332 and then Generic_Parent (Specification (Decl2)) = P
4334 -- With_clause for child unit of instance appears before
4335 -- in the context. We want to place the error message on
4336 -- it, not on the generic child unit itself.
4339 Prev_Clause : Node_Id;
4342 Prev_Clause := First (List_Containing (With_Clause));
4343 while Entity (Name (Prev_Clause)) /= U2 loop
4347 pragma Assert (Present (Prev_Clause));
4348 Error_Msg_N ("illegal with_clause", Prev_Clause);
4350 ("\child unit has visible homograph" &
4351 " (RM 8.3(26), 10.1.1(19))",
4362 end Install_Withed_Unit;
4368 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
4369 K : constant Node_Kind := Nkind (Lib_Unit);
4372 return (K in N_Generic_Declaration or else
4373 K in N_Generic_Instantiation or else
4374 K in N_Generic_Renaming_Declaration or else
4375 K = N_Package_Declaration or else
4376 K = N_Package_Renaming_Declaration or else
4377 K = N_Subprogram_Declaration or else
4378 K = N_Subprogram_Renaming_Declaration)
4379 and then Present (Parent_Spec (Lib_Unit));
4382 -----------------------
4383 -- Load_Needed_Body --
4384 -----------------------
4386 -- N is a generic unit named in a with clause, or else it is a unit that
4387 -- contains a generic unit or an inlined function. In order to perform an
4388 -- instantiation, the body of the unit must be present. If the unit itself
4389 -- is generic, we assume that an instantiation follows, and load & analyze
4390 -- the body unconditionally. This forces analysis of the spec as well.
4392 -- If the unit is not generic, but contains a generic unit, it is loaded on
4393 -- demand, at the point of instantiation (see ch12).
4395 procedure Load_Needed_Body (N : Node_Id; OK : out Boolean) is
4396 Body_Name : Unit_Name_Type;
4397 Unum : Unit_Number_Type;
4399 Save_Style_Check : constant Boolean := Opt.Style_Check;
4400 -- The loading and analysis is done with style checks off
4403 if not GNAT_Mode then
4404 Style_Check := False;
4407 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
4410 (Load_Name => Body_Name,
4416 if Unum = No_Unit then
4420 Compiler_State := Analyzing; -- reset after load
4422 if not Fatal_Error (Unum) or else Try_Semantics then
4423 if Debug_Flag_L then
4424 Write_Str ("*** Loaded generic body");
4428 Semantics (Cunit (Unum));
4434 Style_Check := Save_Style_Check;
4435 end Load_Needed_Body;
4437 -------------------------
4438 -- Build_Limited_Views --
4439 -------------------------
4441 procedure Build_Limited_Views (N : Node_Id) is
4442 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
4443 P : constant Entity_Id := Cunit_Entity (Unum);
4445 Spec : Node_Id; -- To denote a package specification
4446 Lim_Typ : Entity_Id; -- To denote shadow entities
4447 Comp_Typ : Entity_Id; -- To denote real entities
4449 Lim_Header : Entity_Id; -- Package entity
4450 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
4451 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
4453 procedure Decorate_Incomplete_Type
4456 -- Add attributes of an incomplete type to a shadow entity. The same
4457 -- attributes are placed on the real entity, so that gigi receives
4458 -- a consistent view.
4460 procedure Decorate_Package_Specification (P : Entity_Id);
4461 -- Add attributes of a package entity to the entity in a package
4464 procedure Decorate_Tagged_Type
4468 -- Set basic attributes of tagged type T, including its class_wide type.
4469 -- The parameters Loc, Scope are used to decorate the class_wide type.
4471 procedure Build_Chain
4473 First_Decl : Node_Id);
4474 -- Construct list of shadow entities and attach it to entity of
4475 -- package that is mentioned in a limited_with clause.
4477 function New_Internal_Shadow_Entity
4478 (Kind : Entity_Kind;
4479 Sloc_Value : Source_Ptr;
4480 Id_Char : Character) return Entity_Id;
4481 -- Build a new internal entity and append it to the list of shadow
4482 -- entities available through the limited-header
4484 ------------------------------
4485 -- Decorate_Incomplete_Type --
4486 ------------------------------
4488 procedure Decorate_Incomplete_Type
4493 Set_Ekind (E, E_Incomplete_Type);
4494 Set_Scope (E, Scop);
4496 Set_Is_First_Subtype (E, True);
4497 Set_Stored_Constraint (E, No_Elist);
4498 Set_Full_View (E, Empty);
4499 Init_Size_Align (E);
4500 end Decorate_Incomplete_Type;
4502 --------------------------
4503 -- Decorate_Tagged_Type --
4504 --------------------------
4506 procedure Decorate_Tagged_Type
4514 Decorate_Incomplete_Type (T, Scop);
4515 Set_Is_Tagged_Type (T);
4517 -- Build corresponding class_wide type, if not previously done
4519 -- Warning: The class-wide entity is shared by the limited-view
4520 -- and the full-view.
4522 if No (Class_Wide_Type (T)) then
4523 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S'));
4525 Set_Ekind (CW, E_Class_Wide_Type);
4527 Set_Scope (CW, Scop);
4528 Set_Is_Tagged_Type (CW);
4529 Set_Is_First_Subtype (CW, True);
4530 Init_Size_Align (CW);
4531 Set_Has_Unknown_Discriminants (CW, True);
4532 Set_Class_Wide_Type (CW, CW);
4533 Set_Equivalent_Type (CW, Empty);
4534 Set_From_With_Type (CW, From_With_Type (T));
4536 Set_Class_Wide_Type (T, CW);
4538 end Decorate_Tagged_Type;
4540 ------------------------------------
4541 -- Decorate_Package_Specification --
4542 ------------------------------------
4544 procedure Decorate_Package_Specification (P : Entity_Id) is
4546 -- Place only the most basic attributes
4548 Set_Ekind (P, E_Package);
4549 Set_Etype (P, Standard_Void_Type);
4550 end Decorate_Package_Specification;
4552 --------------------------------
4553 -- New_Internal_Shadow_Entity --
4554 --------------------------------
4556 function New_Internal_Shadow_Entity
4557 (Kind : Entity_Kind;
4558 Sloc_Value : Source_Ptr;
4559 Id_Char : Character) return Entity_Id
4561 E : constant Entity_Id :=
4562 Make_Defining_Identifier (Sloc_Value,
4563 Chars => New_Internal_Name (Id_Char));
4566 Set_Ekind (E, Kind);
4567 Set_Is_Internal (E, True);
4569 if Kind in Type_Kind then
4570 Init_Size_Align (E);
4573 Append_Entity (E, Lim_Header);
4576 end New_Internal_Shadow_Entity;
4582 procedure Build_Chain
4584 First_Decl : Node_Id)
4586 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
4587 Is_Tagged : Boolean;
4592 while Present (Decl) loop
4594 -- For each library_package_declaration in the environment, there
4595 -- is an implicit declaration of a *limited view* of that library
4596 -- package. The limited view of a package contains:
4598 -- * For each nested package_declaration, a declaration of the
4599 -- limited view of that package, with the same defining-
4600 -- program-unit name.
4602 -- * For each type_declaration in the visible part, an incomplete
4603 -- type-declaration with the same defining_identifier, whose
4604 -- completion is the type_declaration. If the type_declaration
4605 -- is tagged, then the incomplete_type_declaration is tagged
4608 -- The partial view is tagged if the declaration has the
4609 -- explicit keyword, or else if it is a type extension, both
4610 -- of which can be ascertained syntactically.
4612 if Nkind (Decl) = N_Full_Type_Declaration then
4614 (Nkind (Type_Definition (Decl)) = N_Record_Definition
4615 and then Tagged_Present (Type_Definition (Decl)))
4617 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
4620 (Record_Extension_Part (Type_Definition (Decl))));
4622 Comp_Typ := Defining_Identifier (Decl);
4624 if not Analyzed_Unit then
4626 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4628 Decorate_Incomplete_Type (Comp_Typ, Scope);
4632 -- Create shadow entity for type
4634 Lim_Typ := New_Internal_Shadow_Entity
4635 (Kind => Ekind (Comp_Typ),
4636 Sloc_Value => Sloc (Comp_Typ),
4639 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4640 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4641 Set_From_With_Type (Lim_Typ);
4644 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4646 Decorate_Incomplete_Type (Lim_Typ, Scope);
4649 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4651 elsif Nkind (Decl) = N_Private_Type_Declaration
4652 or else Nkind (Decl) = N_Incomplete_Type_Declaration
4654 Comp_Typ := Defining_Identifier (Decl);
4656 if not Analyzed_Unit then
4657 if Tagged_Present (Decl) then
4658 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4660 Decorate_Incomplete_Type (Comp_Typ, Scope);
4664 Lim_Typ := New_Internal_Shadow_Entity
4665 (Kind => Ekind (Comp_Typ),
4666 Sloc_Value => Sloc (Comp_Typ),
4669 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4670 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4671 Set_From_With_Type (Lim_Typ);
4673 if Tagged_Present (Decl) then
4674 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4676 Decorate_Incomplete_Type (Lim_Typ, Scope);
4679 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4681 elsif Nkind (Decl) = N_Private_Extension_Declaration then
4682 Comp_Typ := Defining_Identifier (Decl);
4684 if not Analyzed_Unit then
4685 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4688 -- Create shadow entity for type
4690 Lim_Typ := New_Internal_Shadow_Entity
4691 (Kind => Ekind (Comp_Typ),
4692 Sloc_Value => Sloc (Comp_Typ),
4695 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4696 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4697 Set_From_With_Type (Lim_Typ);
4699 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4700 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4702 elsif Nkind (Decl) = N_Package_Declaration then
4707 Spec : constant Node_Id := Specification (Decl);
4710 Comp_Typ := Defining_Unit_Name (Spec);
4712 if not Analyzed (Cunit (Unum)) then
4713 Decorate_Package_Specification (Comp_Typ);
4714 Set_Scope (Comp_Typ, Scope);
4717 Lim_Typ := New_Internal_Shadow_Entity
4718 (Kind => Ekind (Comp_Typ),
4719 Sloc_Value => Sloc (Comp_Typ),
4722 Decorate_Package_Specification (Lim_Typ);
4723 Set_Scope (Lim_Typ, Scope);
4725 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4726 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4727 Set_From_With_Type (Lim_Typ);
4729 -- Note: The non_limited_view attribute is not used
4730 -- for local packages.
4734 First_Decl => First (Visible_Declarations (Spec)));
4742 -- Start of processing for Build_Limited_Views
4745 pragma Assert (Limited_Present (N));
4747 -- A library_item mentioned in a limited_with_clause shall
4748 -- be a package_declaration, not a subprogram_declaration,
4749 -- generic_declaration, generic_instantiation, or
4750 -- package_renaming_declaration
4752 case Nkind (Unit (Library_Unit (N))) is
4754 when N_Package_Declaration =>
4757 when N_Subprogram_Declaration =>
4758 Error_Msg_N ("subprograms not allowed in "
4759 & "limited with_clauses", N);
4762 when N_Generic_Package_Declaration |
4763 N_Generic_Subprogram_Declaration =>
4764 Error_Msg_N ("generics not allowed in "
4765 & "limited with_clauses", N);
4768 when N_Generic_Instantiation =>
4769 Error_Msg_N ("generic instantiations not allowed in "
4770 & "limited with_clauses", N);
4773 when N_Generic_Renaming_Declaration =>
4774 Error_Msg_N ("generic renamings not allowed in "
4775 & "limited with_clauses", N);
4778 when N_Subprogram_Renaming_Declaration =>
4779 Error_Msg_N ("renamed subprograms not allowed in "
4780 & "limited with_clauses", N);
4783 when N_Package_Renaming_Declaration =>
4784 Error_Msg_N ("renamed packages not allowed in "
4785 & "limited with_clauses", N);
4789 raise Program_Error;
4792 -- Check if the chain is already built
4794 Spec := Specification (Unit (Library_Unit (N)));
4796 if Limited_View_Installed (Spec) then
4800 Set_Ekind (P, E_Package);
4802 -- Build the header of the limited_view
4804 Lim_Header := Make_Defining_Identifier (Sloc (N),
4805 Chars => New_Internal_Name (Id_Char => 'Z'));
4806 Set_Ekind (Lim_Header, E_Package);
4807 Set_Is_Internal (Lim_Header);
4808 Set_Limited_View (P, Lim_Header);
4810 -- Create the auxiliary chain. All the shadow entities are appended to
4811 -- the list of entities of the limited-view header
4815 First_Decl => First (Visible_Declarations (Spec)));
4817 -- Save the last built shadow entity. It is needed later to set the
4818 -- reference to the first shadow entity in the private part
4820 Last_Pub_Lim_E := Last_Lim_E;
4822 -- Ada 2005 (AI-262): Add the limited view of the private declarations
4823 -- Required to give support to limited-private-with clauses
4825 Build_Chain (Scope => P,
4826 First_Decl => First (Private_Declarations (Spec)));
4828 if Last_Pub_Lim_E /= Empty then
4829 Set_First_Private_Entity (Lim_Header,
4830 Next_Entity (Last_Pub_Lim_E));
4832 Set_First_Private_Entity (Lim_Header,
4836 Set_Limited_View_Installed (Spec);
4837 end Build_Limited_Views;
4839 -------------------------------
4840 -- Check_Body_Needed_For_SAL --
4841 -------------------------------
4843 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
4845 function Entity_Needs_Body (E : Entity_Id) return Boolean;
4846 -- Determine whether use of entity E might require the presence of its
4847 -- body. For a package this requires a recursive traversal of all nested
4850 ---------------------------
4851 -- Entity_Needed_For_SAL --
4852 ---------------------------
4854 function Entity_Needs_Body (E : Entity_Id) return Boolean is
4858 if Is_Subprogram (E)
4859 and then Has_Pragma_Inline (E)
4863 elsif Ekind (E) = E_Generic_Function
4864 or else Ekind (E) = E_Generic_Procedure
4868 elsif Ekind (E) = E_Generic_Package
4870 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
4871 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
4875 elsif Ekind (E) = E_Package
4877 Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
4878 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
4880 Ent := First_Entity (E);
4881 while Present (Ent) loop
4882 if Entity_Needs_Body (Ent) then
4894 end Entity_Needs_Body;
4896 -- Start of processing for Check_Body_Needed_For_SAL
4899 if Ekind (Unit_Name) = E_Generic_Package
4901 Nkind (Unit_Declaration_Node (Unit_Name)) =
4902 N_Generic_Package_Declaration
4904 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
4906 Set_Body_Needed_For_SAL (Unit_Name);
4908 elsif Ekind (Unit_Name) = E_Generic_Procedure
4909 or else Ekind (Unit_Name) = E_Generic_Function
4911 Set_Body_Needed_For_SAL (Unit_Name);
4913 elsif Is_Subprogram (Unit_Name)
4914 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
4915 N_Subprogram_Declaration
4916 and then Has_Pragma_Inline (Unit_Name)
4918 Set_Body_Needed_For_SAL (Unit_Name);
4920 elsif Ekind (Unit_Name) = E_Subprogram_Body then
4921 Check_Body_Needed_For_SAL
4922 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
4924 elsif Ekind (Unit_Name) = E_Package
4925 and then Entity_Needs_Body (Unit_Name)
4927 Set_Body_Needed_For_SAL (Unit_Name);
4929 elsif Ekind (Unit_Name) = E_Package_Body
4930 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
4932 Check_Body_Needed_For_SAL
4933 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
4935 end Check_Body_Needed_For_SAL;
4937 --------------------
4938 -- Remove_Context --
4939 --------------------
4941 procedure Remove_Context (N : Node_Id) is
4942 Lib_Unit : constant Node_Id := Unit (N);
4945 -- If this is a child unit, first remove the parent units
4947 if Is_Child_Spec (Lib_Unit) then
4948 Remove_Parents (Lib_Unit);
4951 Remove_Context_Clauses (N);
4954 ----------------------------
4955 -- Remove_Context_Clauses --
4956 ----------------------------
4958 procedure Remove_Context_Clauses (N : Node_Id) is
4960 Unit_Name : Entity_Id;
4963 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
4964 -- limited-views first and regular-views later (to maintain the
4967 -- First Phase: Remove limited_with context clauses
4969 Item := First (Context_Items (N));
4970 while Present (Item) loop
4972 -- We are interested only in with clauses which got installed
4975 if Nkind (Item) = N_With_Clause
4976 and then Limited_Present (Item)
4977 and then Limited_View_Installed (Item)
4979 Remove_Limited_With_Clause (Item);
4985 -- Second Phase: Loop through context items and undo regular
4986 -- with_clauses and use_clauses.
4988 Item := First (Context_Items (N));
4989 while Present (Item) loop
4991 -- We are interested only in with clauses which got installed on
4992 -- entry, as indicated by their Context_Installed flag set
4994 if Nkind (Item) = N_With_Clause
4995 and then Limited_Present (Item)
4996 and then Limited_View_Installed (Item)
5000 elsif Nkind (Item) = N_With_Clause
5001 and then Context_Installed (Item)
5003 -- Remove items from one with'ed unit
5005 Unit_Name := Entity (Name (Item));
5006 Remove_Unit_From_Visibility (Unit_Name);
5007 Set_Context_Installed (Item, False);
5009 elsif Nkind (Item) = N_Use_Package_Clause then
5010 End_Use_Package (Item);
5012 elsif Nkind (Item) = N_Use_Type_Clause then
5013 End_Use_Type (Item);
5018 end Remove_Context_Clauses;
5020 --------------------------------
5021 -- Remove_Limited_With_Clause --
5022 --------------------------------
5024 procedure Remove_Limited_With_Clause (N : Node_Id) is
5025 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5028 Lim_Header : Entity_Id;
5029 Lim_Typ : Entity_Id;
5033 pragma Assert (Limited_View_Installed (N));
5035 -- In case of limited with_clause on subprograms, generics, instances,
5036 -- or renamings, the corresponding error was previously posted and we
5037 -- have nothing to do here.
5039 if Nkind (P_Unit) /= N_Package_Declaration then
5043 P := Defining_Unit_Name (Specification (P_Unit));
5045 -- Handle child packages
5047 if Nkind (P) = N_Defining_Program_Unit_Name then
5048 P := Defining_Identifier (P);
5051 if Debug_Flag_I then
5052 Write_Str ("remove limited view of ");
5053 Write_Name (Chars (P));
5054 Write_Str (" from visibility");
5058 -- Prepare the removal of the shadow entities from visibility. The
5059 -- first element of the limited view is a header (an E_Package
5060 -- entity) that is used to reference the first shadow entity in the
5061 -- private part of the package
5063 Lim_Header := Limited_View (P);
5064 Lim_Typ := First_Entity (Lim_Header);
5066 -- Remove package and shadow entities from visibility if it has not
5069 if not Analyzed (P_Unit) then
5071 Set_Is_Immediately_Visible (P, False);
5073 while Present (Lim_Typ) loop
5075 Next_Entity (Lim_Typ);
5078 -- Otherwise this package has already appeared in the closure and its
5079 -- shadow entities must be replaced by its real entities. This code
5080 -- must be kept synchronized with the complementary code in Install
5081 -- Limited_Withed_Unit.
5084 -- Real entities that are type or subtype declarations were hidden
5085 -- from visibility at the point of installation of the limited-view.
5086 -- Now we recover the previous value of the hidden attribute.
5088 E := First_Entity (P);
5089 while Present (E) and then E /= First_Private_Entity (P) loop
5091 Set_Is_Hidden (E, Was_Hidden (E));
5097 while Present (Lim_Typ)
5098 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5100 -- Nested packages and child units were not unchained
5102 if Ekind (Lim_Typ) /= E_Package
5103 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5105 -- Handle incomplete types of the real view. For this purpose
5106 -- we traverse the list of visible entities to look for an
5107 -- incomplete type in the real-view associated with Lim_Typ.
5109 E := First_Entity (P);
5110 while Present (E) and then E /= First_Private_Entity (P) loop
5111 exit when Ekind (E) = E_Incomplete_Type
5112 and then Present (Full_View (E))
5113 and then Full_View (E) = Lim_Typ;
5118 -- If the previous search was not sucessful then the entity
5119 -- to be restored in the homonym list is the non-limited view
5121 if E = First_Private_Entity (P) then
5122 E := Non_Limited_View (Lim_Typ);
5125 pragma Assert (not In_Chain (E));
5127 Prev := Current_Entity (Lim_Typ);
5129 if Prev = Lim_Typ then
5130 Set_Current_Entity (E);
5133 while Present (Prev)
5134 and then Homonym (Prev) /= Lim_Typ
5136 Prev := Homonym (Prev);
5139 if Present (Prev) then
5140 Set_Homonym (Prev, E);
5144 -- We must also set the next homonym entity of the real entity
5145 -- to handle the case in which the next homonym was a shadow
5148 Set_Homonym (E, Homonym (Lim_Typ));
5151 Next_Entity (Lim_Typ);
5155 -- Indicate that the limited view of the package is not installed
5157 Set_From_With_Type (P, False);
5158 Set_Limited_View_Installed (N, False);
5159 end Remove_Limited_With_Clause;
5161 --------------------
5162 -- Remove_Parents --
5163 --------------------
5165 procedure Remove_Parents (Lib_Unit : Node_Id) is
5168 P_Spec : Node_Id := Empty;
5170 Vis : constant Boolean :=
5171 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
5174 if Is_Child_Spec (Lib_Unit) then
5175 P_Spec := Parent_Spec (Lib_Unit);
5177 elsif Nkind (Lib_Unit) = N_Package_Body
5178 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
5180 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
5183 if Present (P_Spec) then
5186 P_Name := Get_Parent_Entity (P);
5187 Remove_Context_Clauses (P_Spec);
5188 End_Package_Scope (P_Name);
5189 Set_Is_Immediately_Visible (P_Name, Vis);
5191 -- Remove from visibility the siblings as well, which are directly
5192 -- visible while the parent is in scope.
5194 E := First_Entity (P_Name);
5195 while Present (E) loop
5196 if Is_Child_Unit (E) then
5197 Set_Is_Immediately_Visible (E, False);
5203 Set_In_Package_Body (P_Name, False);
5205 -- This is the recursive call to remove the context of any
5206 -- higher level parent. This recursion ensures that all parents
5207 -- are removed in the reverse order of their installation.
5213 ---------------------------------
5214 -- Remove_Private_With_Clauses --
5215 ---------------------------------
5217 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
5220 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
5221 -- Check whether a given unit appears in a regular with_clause.
5222 -- Used to determine whether a private_with_clause, implicit or
5223 -- explicit, should be ignored.
5225 ----------------------------
5226 -- In_Regular_With_Clause --
5227 ----------------------------
5229 function In_Regular_With_Clause (E : Entity_Id) return Boolean
5234 Item := First (Context_Items (Comp_Unit));
5235 while Present (Item) loop
5236 if Nkind (Item) = N_With_Clause
5237 and then Entity (Name (Item)) = E
5238 and then not Private_Present (Item)
5246 end In_Regular_With_Clause;
5248 -- Start of processing for Remove_Private_With_Clauses
5251 Item := First (Context_Items (Comp_Unit));
5252 while Present (Item) loop
5253 if Nkind (Item) = N_With_Clause
5254 and then Private_Present (Item)
5257 -- If private_with_clause is redundant, remove it from
5258 -- context, as a small optimization to subsequent handling
5259 -- of private_with clauses in other nested packages..
5261 if In_Regular_With_Clause (Entity (Name (Item))) then
5263 Nxt : constant Node_Id := Next (Item);
5270 elsif Limited_Present (Item) then
5271 if not Limited_View_Installed (Item) then
5272 Remove_Limited_With_Clause (Item);
5278 Remove_Unit_From_Visibility (Entity (Name (Item)));
5279 Set_Context_Installed (Item, False);
5287 end Remove_Private_With_Clauses;
5289 ---------------------------------
5290 -- Remove_Unit_From_Visibility --
5291 ---------------------------------
5293 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
5294 P : constant Entity_Id := Scope (Unit_Name);
5298 if Debug_Flag_I then
5299 Write_Str ("remove unit ");
5300 Write_Name (Chars (Unit_Name));
5301 Write_Str (" from visibility");
5305 if P /= Standard_Standard then
5306 Set_Is_Visible_Child_Unit (Unit_Name, False);
5309 Set_Is_Potentially_Use_Visible (Unit_Name, False);
5310 Set_Is_Immediately_Visible (Unit_Name, False);
5311 end Remove_Unit_From_Visibility;
5326 procedure Unchain (E : Entity_Id) is
5330 Prev := Current_Entity (E);
5336 Set_Name_Entity_Id (Chars (E), Homonym (E));
5339 while Present (Prev)
5340 and then Homonym (Prev) /= E
5342 Prev := Homonym (Prev);
5345 if Present (Prev) then
5346 Set_Homonym (Prev, Homonym (E));
5350 if Debug_Flag_I then
5351 Write_Str (" (homonym) unchain ");
5352 Write_Name (Chars (E));