1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2008, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Debug; use Debug;
28 with Einfo; use Einfo;
29 with Errout; use Errout;
30 with Exp_Util; use Exp_Util;
31 with Elists; use Elists;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
35 with Impunit; use Impunit;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Namet; use Namet;
41 with Nlists; use Nlists;
42 with Nmake; use Nmake;
44 with Output; use Output;
45 with 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.
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 (Pragma_Name (Cont_Item) = Name_Elaborate
393 Pragma_Name (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 applied.
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 detected 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 not Nkind_In (Unit (Lib_Unit), N_Package_Declaration,
676 N_Generic_Package_Declaration)
679 ("no legal package declaration for package body", N);
682 -- Otherwise, the entity in the declaration is visible. Update
683 -- the version to reflect dependence of this body on the spec.
686 Spec_Id := Defining_Entity (Unit (Lib_Unit));
687 Set_Is_Immediately_Visible (Spec_Id, True);
688 Version_Update (N, Lib_Unit);
690 if Nkind (Defining_Unit_Name (Unit_Node)) =
691 N_Defining_Program_Unit_Name
693 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
698 -- If the unit is a subprogram body, then we similarly need to analyze
699 -- its spec. However, things are a little simpler in this case, because
700 -- here, this analysis is done only for error checking and consistency
701 -- purposes, so there's nothing else to be done.
703 elsif Nkind (Unit_Node) = N_Subprogram_Body then
704 if Acts_As_Spec (N) then
706 -- If the subprogram body is a child unit, we must create a
707 -- declaration for it, in order to properly load the parent(s).
708 -- After this, the original unit does not acts as a spec, because
709 -- there is an explicit one. If this unit appears in a context
710 -- clause, then an implicit with on the parent will be added when
711 -- installing the context. If this is the main unit, there is no
712 -- Unit_Table entry for the declaration (it has the unit number
713 -- of the main unit) and code generation is unaffected.
715 Unum := Get_Cunit_Unit_Number (N);
716 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
718 if Par_Spec_Name /= No_Unit_Name then
721 (Load_Name => Par_Spec_Name,
726 if Unum /= No_Unit then
728 -- Build subprogram declaration and attach parent unit to it
729 -- This subprogram declaration does not come from source,
730 -- Nevertheless the backend must generate debugging info for
731 -- it, and this must be indicated explicitly. We also mark
732 -- the body entity as a child unit now, to prevent a
733 -- cascaded error if the spec entity cannot be entered
737 Loc : constant Source_Ptr := Sloc (N);
738 SCS : constant Boolean :=
739 Get_Comes_From_Source_Default;
742 Set_Comes_From_Source_Default (False);
744 Make_Compilation_Unit (Loc,
745 Context_Items => New_Copy_List (Context_Items (N)),
747 Make_Subprogram_Declaration (Sloc (N),
750 (Specification (Unit_Node))),
752 Make_Compilation_Unit_Aux (Loc));
754 Set_Library_Unit (N, Lib_Unit);
755 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
756 Semantics (Lib_Unit);
758 -- Now that a separate declaration exists, the body
759 -- of the child unit does not act as spec any longer.
761 Set_Acts_As_Spec (N, False);
762 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
763 Set_Debug_Info_Needed (Defining_Entity (Unit (Lib_Unit)));
764 Set_Comes_From_Source_Default (SCS);
769 -- Here for subprogram with separate declaration
772 Semantics (Lib_Unit);
773 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
774 Version_Update (N, Lib_Unit);
777 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
778 N_Defining_Program_Unit_Name
780 Generate_Parent_References (
781 Specification (Unit_Node),
782 Scope (Defining_Entity (Unit (Lib_Unit))));
786 -- If it is a child unit, the parent must be elaborated first
787 -- and we update version, since we are dependent on our parent.
789 if Is_Child_Spec (Unit_Node) then
791 -- The analysis of the parent is done with style checks off
794 Save_Style_Check : constant Boolean := Style_Check;
795 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
796 Cunit_Boolean_Restrictions_Save;
799 if not GNAT_Mode then
800 Style_Check := False;
803 Semantics (Parent_Spec (Unit_Node));
804 Version_Update (N, Parent_Spec (Unit_Node));
805 Style_Check := Save_Style_Check;
806 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
810 -- With the analysis done, install the context. Note that we can't
811 -- install the context from the with clauses as we analyze them, because
812 -- each with clause must be analyzed in a clean visibility context, so
813 -- we have to wait and install them all at once.
817 if Is_Child_Spec (Unit_Node) then
819 -- Set the entities of all parents in the program_unit_name
821 Generate_Parent_References (
822 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
825 -- All components of the context: with-clauses, library unit, ancestors
826 -- if any, (and their context) are analyzed and installed.
828 -- Call special debug routine sm if this is the main unit
830 if Current_Sem_Unit = Main_Unit then
834 -- Now analyze the unit (package, subprogram spec, body) itself
838 if Warn_On_Redundant_Constructs then
839 Check_Redundant_Withs (Context_Items (N));
841 if Nkind (Unit_Node) = N_Package_Body then
842 Check_Redundant_Withs
843 (Context_Items => Context_Items (N),
844 Spec_Context_Items => Context_Items (Lib_Unit));
848 -- The above call might have made Unit_Node an N_Subprogram_Body from
849 -- something else, so propagate any Acts_As_Spec flag.
851 if Nkind (Unit_Node) = N_Subprogram_Body
852 and then Acts_As_Spec (Unit_Node)
854 Set_Acts_As_Spec (N);
857 -- Register predefined units in Rtsfind
860 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
862 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
863 Set_RTU_Loaded (Unit_Node);
867 -- Treat compilation unit pragmas that appear after the library unit
869 if Present (Pragmas_After (Aux_Decls_Node (N))) then
871 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
873 while Present (Prag_Node) loop
880 -- Generate distribution stubs if requested and no error
883 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
885 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
886 and then not Fatal_Error (Main_Unit)
888 if Is_RCI_Pkg_Spec_Or_Body (N) then
890 -- Regular RCI package
892 Add_Stub_Constructs (N);
894 elsif (Nkind (Unit_Node) = N_Package_Declaration
895 and then Is_Shared_Passive (Defining_Entity
896 (Specification (Unit_Node))))
897 or else (Nkind (Unit_Node) = N_Package_Body
899 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
901 -- Shared passive package
903 Add_Stub_Constructs (N);
905 elsif Nkind (Unit_Node) = N_Package_Instantiation
907 Is_Remote_Call_Interface
908 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
910 -- Instantiation of a RCI generic package
912 Add_Stub_Constructs (N);
916 -- Remove unit from visibility, so that environment is clean for
917 -- the next compilation, which is either the main unit or some
918 -- other unit in the context.
920 if Nkind_In (Unit_Node, N_Package_Declaration,
921 N_Package_Renaming_Declaration,
922 N_Subprogram_Declaration)
923 or else Nkind (Unit_Node) in N_Generic_Declaration
925 (Nkind (Unit_Node) = N_Subprogram_Body
926 and then Acts_As_Spec (Unit_Node))
928 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
930 -- If the unit is an instantiation whose body will be elaborated for
931 -- inlining purposes, use the proper entity of the instance. The
932 -- entity may be missing if the instantiation was illegal.
934 elsif Nkind (Unit_Node) = N_Package_Instantiation
935 and then not Error_Posted (Unit_Node)
936 and then Present (Instance_Spec (Unit_Node))
938 Remove_Unit_From_Visibility
939 (Defining_Entity (Instance_Spec (Unit_Node)));
941 elsif Nkind (Unit_Node) = N_Package_Body
942 or else (Nkind (Unit_Node) = N_Subprogram_Body
943 and then not Acts_As_Spec (Unit_Node))
945 -- Bodies that are not the main unit are compiled if they are generic
946 -- or contain generic or inlined units. Their analysis brings in the
947 -- context of the corresponding spec (unit declaration) which must be
948 -- removed as well, to return the compilation environment to its
951 Remove_Context (Lib_Unit);
952 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
955 -- Last step is to deinstall the context we just installed as well as
956 -- the unit just compiled.
960 -- If this is the main unit and we are generating code, we must check
961 -- that all generic units in the context have a body if they need it,
962 -- even if they have not been instantiated. In the absence of .ali files
963 -- for generic units, we must force the load of the body, just to
964 -- produce the proper error if the body is absent. We skip this
965 -- verification if the main unit itself is generic.
967 if Get_Cunit_Unit_Number (N) = Main_Unit
968 and then Operating_Mode = Generate_Code
969 and then Expander_Active
971 -- Check whether the source for the body of the unit must be included
972 -- in a standalone library.
974 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
976 -- Indicate that the main unit is now analyzed, to catch possible
977 -- circularities between it and generic bodies. Remove main unit from
978 -- visibility. This might seem superfluous, but the main unit must
979 -- not be visible in the generic body expansions that follow.
981 Set_Analyzed (N, True);
982 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
987 Un : Unit_Number_Type;
989 Save_Style_Check : constant Boolean := Style_Check;
990 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
991 Cunit_Boolean_Restrictions_Save;
994 Item := First (Context_Items (N));
995 while Present (Item) loop
997 -- Check for explicit with clause
999 if Nkind (Item) = N_With_Clause
1000 and then not Implicit_With (Item)
1002 -- Ada 2005 (AI-50217): Ignore limited-withed units
1004 and then not Limited_Present (Item)
1006 Nam := Entity (Name (Item));
1008 -- Compile generic subprogram, unless it is intrinsic or
1009 -- imported so no body is required, or generic package body
1010 -- if the package spec requires a body.
1012 if (Is_Generic_Subprogram (Nam)
1013 and then not Is_Intrinsic_Subprogram (Nam)
1014 and then not Is_Imported (Nam))
1015 or else (Ekind (Nam) = E_Generic_Package
1016 and then Unit_Requires_Body (Nam))
1018 Style_Check := False;
1020 if Present (Renamed_Object (Nam)) then
1023 (Load_Name => Get_Body_Name
1025 (Unit_Declaration_Node
1026 (Renamed_Object (Nam)))),
1034 (Load_Name => Get_Body_Name
1035 (Get_Unit_Name (Item)),
1042 if Un = No_Unit then
1044 ("body of generic unit& not found", Item, Nam);
1047 elsif not Analyzed (Cunit (Un))
1048 and then Un /= Main_Unit
1049 and then not Fatal_Error (Un)
1051 Style_Check := False;
1052 Semantics (Cunit (Un));
1060 Style_Check := Save_Style_Check;
1061 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1065 -- Deal with creating elaboration Boolean if needed. We create an
1066 -- elaboration boolean only for units that come from source since
1067 -- units manufactured by the compiler never need elab checks.
1069 if Comes_From_Source (N)
1070 and then Nkind_In (Unit_Node, N_Package_Declaration,
1071 N_Generic_Package_Declaration,
1072 N_Subprogram_Declaration,
1073 N_Generic_Subprogram_Declaration)
1076 Loc : constant Source_Ptr := Sloc (N);
1077 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1080 Spec_Id := Defining_Entity (Unit_Node);
1081 Generate_Definition (Spec_Id);
1083 -- See if an elaboration entity is required for possible access
1084 -- before elaboration checking. Note that we must allow for this
1085 -- even if -gnatE is not set, since a client may be compiled in
1086 -- -gnatE mode and reference the entity.
1088 -- These entities are also used by the binder to prevent multiple
1089 -- attempts to execute the elaboration code for the library case
1090 -- where the elaboration routine might otherwise be called more
1093 -- Case of units which do not require elaboration checks
1096 -- Pure units do not need checks
1100 -- Preelaborated units do not need checks
1102 or else Is_Preelaborated (Spec_Id)
1104 -- No checks needed if pragma Elaborate_Body present
1106 or else Has_Pragma_Elaborate_Body (Spec_Id)
1108 -- No checks needed if unit does not require a body
1110 or else not Unit_Requires_Body (Spec_Id)
1112 -- No checks needed for predefined files
1114 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1116 -- No checks required if no separate spec
1118 or else Acts_As_Spec (N)
1120 -- This is a case where we only need the entity for
1121 -- checking to prevent multiple elaboration checks.
1123 Set_Elaboration_Entity_Required (Spec_Id, False);
1125 -- Case of elaboration entity is required for access before
1126 -- elaboration checking (so certainly we must build it!)
1129 Set_Elaboration_Entity_Required (Spec_Id, True);
1132 Build_Elaboration_Entity (N, Spec_Id);
1136 -- Freeze the compilation unit entity. This for sure is needed because
1137 -- of some warnings that can be output (see Freeze_Subprogram), but may
1138 -- in general be required. If freezing actions result, place them in the
1139 -- compilation unit actions list, and analyze them.
1142 Loc : constant Source_Ptr := Sloc (N);
1143 L : constant List_Id :=
1144 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), Loc);
1146 while Is_Non_Empty_List (L) loop
1147 Insert_Library_Level_Action (Remove_Head (L));
1153 if Nkind (Unit_Node) = N_Package_Declaration
1154 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1155 and then Expander_Active
1158 Save_Style_Check : constant Boolean := Style_Check;
1159 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1160 Options : Style_Check_Options;
1163 Save_Style_Check_Options (Options);
1164 Reset_Style_Check_Options;
1165 Opt.Warning_Mode := Suppress;
1166 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1168 Reset_Style_Check_Options;
1169 Set_Style_Check_Options (Options);
1170 Style_Check := Save_Style_Check;
1171 Warning_Mode := Save_Warning;
1175 -- If we are generating obsolescent warnings, then here is where we
1176 -- generate them for the with'ed items. The reason for this special
1177 -- processing is that the normal mechanism of generating the warnings
1178 -- for referenced entities does not work for context clause references.
1179 -- That's because when we first analyze the context, it is too early to
1180 -- know if the with'ing unit is itself obsolescent (which suppresses
1183 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1185 -- Push current compilation unit as scope, so that the test for
1186 -- being within an obsolescent unit will work correctly.
1188 Push_Scope (Defining_Entity (Unit_Node));
1190 -- Loop through context items to deal with with clauses
1198 Item := First (Context_Items (N));
1199 while Present (Item) loop
1200 if Nkind (Item) = N_With_Clause
1202 -- Suppress this check in limited-withed units. Further work
1203 -- needed here if we decide to incorporate this check on
1204 -- limited-withed units.
1206 and then not Limited_Present (Item)
1209 Ent := Entity (Nam);
1211 if Is_Obsolescent (Ent) then
1212 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1220 -- Remove temporary install of current unit as scope
1224 end Analyze_Compilation_Unit;
1226 ---------------------
1227 -- Analyze_Context --
1228 ---------------------
1230 procedure Analyze_Context (N : Node_Id) is
1231 Ukind : constant Node_Kind := Nkind (Unit (N));
1235 -- First process all configuration pragmas at the start of the context
1236 -- items. Strictly these are not part of the context clause, but that
1237 -- is where the parser puts them. In any case for sure we must analyze
1238 -- these before analyzing the actual context items, since they can have
1239 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1240 -- be with'ed as a result of changing categorizations in Ada 2005).
1242 Item := First (Context_Items (N));
1243 while Present (Item)
1244 and then Nkind (Item) = N_Pragma
1245 and then Pragma_Name (Item) in Configuration_Pragma_Names
1251 -- This is the point at which we capture the configuration settings
1252 -- for the unit. At the moment only the Optimize_Alignment setting
1253 -- needs to be captured. Probably more later ???
1255 if Optimize_Alignment_Local then
1256 Set_OA_Setting (Current_Sem_Unit, 'L');
1258 Set_OA_Setting (Current_Sem_Unit, Optimize_Alignment);
1261 -- Loop through actual context items. This is done in two passes:
1263 -- a) The first pass analyzes non-limited with-clauses and also any
1264 -- configuration pragmas (we need to get the latter analyzed right
1265 -- away, since they can affect processing of subsequent items.
1267 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1269 while Present (Item) loop
1271 -- For with clause, analyze the with clause, and then update
1272 -- the version, since we are dependent on a unit that we with.
1274 if Nkind (Item) = N_With_Clause
1275 and then not Limited_Present (Item)
1277 -- Skip analyzing with clause if no unit, nothing to do (this
1278 -- happens for a with that references a non-existent unit)
1280 if Present (Library_Unit (Item)) then
1284 if not Implicit_With (Item) then
1285 Version_Update (N, Library_Unit (Item));
1288 -- Skip pragmas. Configuration pragmas at the start were handled in
1289 -- the loop above, and remaining pragmas are not processed until we
1290 -- actually install the context (see Install_Context). We delay the
1291 -- analysis of these pragmas to make sure that we have installed all
1292 -- the implicit with's on parent units.
1294 -- Skip use clauses at this stage, since we don't want to do any
1295 -- installing of potentially use visible entities until we we
1296 -- actually install the complete context (in Install_Context).
1297 -- Otherwise things can get installed in the wrong context.
1306 -- Second pass: examine all limited_with clauses. All other context
1307 -- items are ignored in this pass.
1309 Item := First (Context_Items (N));
1310 while Present (Item) loop
1311 if Nkind (Item) = N_With_Clause
1312 and then Limited_Present (Item)
1314 -- No need to check errors on implicitly generated limited-with
1317 if not Implicit_With (Item) then
1319 -- Verify that the illegal contexts given in 10.1.2 (18/2)
1320 -- are properly rejected, including renaming declarations.
1322 if not Nkind_In (Ukind, N_Package_Declaration,
1323 N_Subprogram_Declaration)
1324 and then Ukind not in N_Generic_Declaration
1325 and then Ukind not in N_Generic_Instantiation
1327 Error_Msg_N ("limited with_clause not allowed here", Item);
1329 -- Check wrong use of a limited with clause applied to the
1330 -- compilation unit containing the limited-with clause.
1332 -- limited with P.Q;
1333 -- package P.Q is ...
1335 elsif Unit (Library_Unit (Item)) = Unit (N) then
1336 Error_Msg_N ("wrong use of limited-with clause", Item);
1338 -- Check wrong use of limited-with clause applied to some
1339 -- immediate ancestor.
1341 elsif Is_Child_Spec (Unit (N)) then
1343 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1347 P := Parent_Spec (Unit (N));
1349 if Unit (P) = Lib_U then
1350 Error_Msg_N ("limited with_clause of immediate "
1351 & "ancestor not allowed", Item);
1355 exit when not Is_Child_Spec (Unit (P));
1356 P := Parent_Spec (Unit (P));
1361 -- Check if the limited-withed unit is already visible through
1362 -- some context clause of the current compilation unit or some
1363 -- ancestor of the current compilation unit.
1366 Lim_Unit_Name : constant Node_Id := Name (Item);
1367 Comp_Unit : Node_Id;
1369 Unit_Name : Node_Id;
1374 It := First (Context_Items (Comp_Unit));
1375 while Present (It) loop
1377 and then Nkind (It) = N_With_Clause
1378 and then not Limited_Present (It)
1380 Nkind_In (Unit (Library_Unit (It)),
1381 N_Package_Declaration,
1382 N_Package_Renaming_Declaration)
1384 if Nkind (Unit (Library_Unit (It))) =
1385 N_Package_Declaration
1387 Unit_Name := Name (It);
1389 Unit_Name := Name (Unit (Library_Unit (It)));
1392 -- Check if the named package (or some ancestor)
1393 -- leaves visible the full-view of the unit given
1394 -- in the limited-with clause
1397 if Designate_Same_Unit (Lim_Unit_Name,
1400 Error_Msg_Sloc := Sloc (It);
1402 ("simultaneous visibility of limited "
1403 & "and unlimited views not allowed",
1406 ("\unlimited view visible through "
1407 & "context clause #",
1411 elsif Nkind (Unit_Name) = N_Identifier then
1415 Unit_Name := Prefix (Unit_Name);
1422 exit when not Is_Child_Spec (Unit (Comp_Unit));
1424 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1429 -- Skip analyzing with clause if no unit, see above
1431 if Present (Library_Unit (Item)) then
1435 -- A limited_with does not impose an elaboration order, but
1436 -- there is a semantic dependency for recompilation purposes.
1438 if not Implicit_With (Item) then
1439 Version_Update (N, Library_Unit (Item));
1442 -- Pragmas and use clauses and with clauses other than limited
1443 -- with's are ignored in this pass through the context items.
1451 end Analyze_Context;
1453 -------------------------------
1454 -- Analyze_Package_Body_Stub --
1455 -------------------------------
1457 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1458 Id : constant Entity_Id := Defining_Identifier (N);
1462 -- The package declaration must be in the current declarative part
1464 Check_Stub_Level (N);
1465 Nam := Current_Entity_In_Scope (Id);
1467 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1468 Error_Msg_N ("missing specification for package stub", N);
1470 elsif Has_Completion (Nam)
1471 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1473 Error_Msg_N ("duplicate or redundant stub for package", N);
1476 -- Indicate that the body of the package exists. If we are doing
1477 -- only semantic analysis, the stub stands for the body. If we are
1478 -- generating code, the existence of the body will be confirmed
1479 -- when we load the proper body.
1481 Set_Has_Completion (Nam);
1482 Set_Scope (Defining_Entity (N), Current_Scope);
1483 Generate_Reference (Nam, Id, 'b');
1484 Analyze_Proper_Body (N, Nam);
1486 end Analyze_Package_Body_Stub;
1488 -------------------------
1489 -- Analyze_Proper_Body --
1490 -------------------------
1492 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1493 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1494 Unum : Unit_Number_Type;
1496 procedure Optional_Subunit;
1497 -- This procedure is called when the main unit is a stub, or when we
1498 -- are not generating code. In such a case, we analyze the subunit if
1499 -- present, which is user-friendly and in fact required for ASIS, but
1500 -- we don't complain if the subunit is missing.
1502 ----------------------
1503 -- Optional_Subunit --
1504 ----------------------
1506 procedure Optional_Subunit is
1507 Comp_Unit : Node_Id;
1510 -- Try to load subunit, but ignore any errors that occur during
1511 -- the loading of the subunit, by using the special feature in
1512 -- Errout to ignore all errors. Note that Fatal_Error will still
1513 -- be set, so we will be able to check for this case below.
1515 if not ASIS_Mode then
1516 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1521 (Load_Name => Subunit_Name,
1526 if not ASIS_Mode then
1527 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1530 -- All done if we successfully loaded the subunit
1533 and then (not Fatal_Error (Unum) or else Try_Semantics)
1535 Comp_Unit := Cunit (Unum);
1537 -- If the file was empty or seriously mangled, the unit
1538 -- itself may be missing.
1540 if No (Unit (Comp_Unit)) then
1542 ("subunit does not contain expected proper body", N);
1544 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1546 ("expected SEPARATE subunit, found child unit",
1547 Cunit_Entity (Unum));
1549 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1550 Analyze_Subunit (Comp_Unit);
1551 Set_Library_Unit (N, Comp_Unit);
1554 elsif Unum = No_Unit
1555 and then Present (Nam)
1557 if Is_Protected_Type (Nam) then
1558 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1560 Set_Corresponding_Body (
1561 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1564 end Optional_Subunit;
1566 -- Start of processing for Analyze_Proper_Body
1569 -- If the subunit is already loaded, it means that the main unit
1570 -- is a subunit, and that the current unit is one of its parents
1571 -- which was being analyzed to provide the needed context for the
1572 -- analysis of the subunit. In this case we analyze the subunit and
1573 -- continue with the parent, without looking a subsequent subunits.
1575 if Is_Loaded (Subunit_Name) then
1577 -- If the proper body is already linked to the stub node,
1578 -- the stub is in a generic unit and just needs analyzing.
1580 if Present (Library_Unit (N)) then
1581 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1582 Analyze_Subunit (Library_Unit (N));
1584 -- Otherwise we must load the subunit and link to it
1587 -- Load the subunit, this must work, since we originally
1588 -- loaded the subunit earlier on. So this will not really
1589 -- load it, just give access to it.
1593 (Load_Name => Subunit_Name,
1598 -- And analyze the subunit in the parent context (note that we
1599 -- do not call Semantics, since that would remove the parent
1600 -- context). Because of this, we have to manually reset the
1601 -- compiler state to Analyzing since it got destroyed by Load.
1603 if Unum /= No_Unit then
1604 Compiler_State := Analyzing;
1606 -- Check that the proper body is a subunit and not a child
1607 -- unit. If the unit was previously loaded, the error will
1608 -- have been emitted when copying the generic node, so we
1609 -- just return to avoid cascaded errors.
1611 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1615 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1616 Analyze_Subunit (Cunit (Unum));
1617 Set_Library_Unit (N, Cunit (Unum));
1621 -- If the main unit is a subunit, then we are just performing semantic
1622 -- analysis on that subunit, and any other subunits of any parent unit
1623 -- should be ignored, except that if we are building trees for ASIS
1624 -- usage we want to annotate the stub properly.
1626 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1627 and then Subunit_Name /= Unit_Name (Main_Unit)
1633 -- But before we return, set the flag for unloaded subunits. This
1634 -- will suppress junk warnings of variables in the same declarative
1635 -- part (or a higher level one) that are in danger of looking unused
1636 -- when in fact there might be a declaration in the subunit that we
1637 -- do not intend to load.
1639 Unloaded_Subunits := True;
1642 -- If the subunit is not already loaded, and we are generating code,
1643 -- then this is the case where compilation started from the parent,
1644 -- and we are generating code for an entire subunit tree. In that
1645 -- case we definitely need to load the subunit.
1647 -- In order to continue the analysis with the rest of the parent,
1648 -- and other subunits, we load the unit without requiring its
1649 -- presence, and emit a warning if not found, rather than terminating
1650 -- the compilation abruptly, as for other missing file problems.
1652 elsif Original_Operating_Mode = Generate_Code then
1654 -- If the proper body is already linked to the stub node,
1655 -- the stub is in a generic unit and just needs analyzing.
1657 -- We update the version. Although we are not technically
1658 -- semantically dependent on the subunit, given our approach
1659 -- of macro substitution of subunits, it makes sense to
1660 -- include it in the version identification.
1662 if Present (Library_Unit (N)) then
1663 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1664 Analyze_Subunit (Library_Unit (N));
1665 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1667 -- Otherwise we must load the subunit and link to it
1672 (Load_Name => Subunit_Name,
1677 if Original_Operating_Mode = Generate_Code
1678 and then Unum = No_Unit
1680 Error_Msg_Unit_1 := Subunit_Name;
1682 Get_File_Name (Subunit_Name, Subunit => True);
1684 ("subunit$$ in file{ not found?", N);
1685 Subunits_Missing := True;
1688 -- Load_Unit may reset Compiler_State, since it may have been
1689 -- necessary to parse an additional units, so we make sure
1690 -- that we reset it to the Analyzing state.
1692 Compiler_State := Analyzing;
1694 if Unum /= No_Unit then
1695 if Debug_Flag_L then
1696 Write_Str ("*** Loaded subunit from stub. Analyze");
1701 Comp_Unit : constant Node_Id := Cunit (Unum);
1704 -- Check for child unit instead of subunit
1706 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1708 ("expected SEPARATE subunit, found child unit",
1709 Cunit_Entity (Unum));
1711 -- OK, we have a subunit
1714 -- Set corresponding stub (even if errors)
1716 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1718 -- Analyze the unit if semantics active
1720 if not Fatal_Error (Unum) or else Try_Semantics then
1721 Analyze_Subunit (Comp_Unit);
1724 -- Set the library unit pointer in any case
1726 Set_Library_Unit (N, Comp_Unit);
1728 -- We update the version. Although we are not technically
1729 -- semantically dependent on the subunit, given our
1730 -- approach of macro substitution of subunits, it makes
1731 -- sense to include it in the version identification.
1733 Version_Update (Cunit (Main_Unit), Comp_Unit);
1739 -- The remaining case is when the subunit is not already loaded and
1740 -- we are not generating code. In this case we are just performing
1741 -- semantic analysis on the parent, and we are not interested in
1742 -- the subunit. For subprograms, analyze the stub as a body. For
1743 -- other entities the stub has already been marked as completed.
1748 end Analyze_Proper_Body;
1750 ----------------------------------
1751 -- Analyze_Protected_Body_Stub --
1752 ----------------------------------
1754 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1755 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1758 Check_Stub_Level (N);
1760 -- First occurrence of name may have been as an incomplete type
1762 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1763 Nam := Full_View (Nam);
1767 or else not Is_Protected_Type (Etype (Nam))
1769 Error_Msg_N ("missing specification for Protected body", N);
1771 Set_Scope (Defining_Entity (N), Current_Scope);
1772 Set_Has_Completion (Etype (Nam));
1773 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1774 Analyze_Proper_Body (N, Etype (Nam));
1776 end Analyze_Protected_Body_Stub;
1778 ----------------------------------
1779 -- Analyze_Subprogram_Body_Stub --
1780 ----------------------------------
1782 -- A subprogram body stub can appear with or without a previous
1783 -- specification. If there is one, the analysis of the body will
1784 -- find it and verify conformance. The formals appearing in the
1785 -- specification of the stub play no role, except for requiring an
1786 -- additional conformance check. If there is no previous subprogram
1787 -- declaration, the stub acts as a spec, and provides the defining
1788 -- entity for the subprogram.
1790 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1794 Check_Stub_Level (N);
1796 -- Verify that the identifier for the stub is unique within this
1797 -- declarative part.
1799 if Nkind_In (Parent (N), N_Block_Statement,
1803 Decl := First (Declarations (Parent (N)));
1804 while Present (Decl)
1807 if Nkind (Decl) = N_Subprogram_Body_Stub
1808 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1809 Chars (Defining_Unit_Name (Specification (N))))
1811 Error_Msg_N ("identifier for stub is not unique", N);
1818 -- Treat stub as a body, which checks conformance if there is a previous
1819 -- declaration, or else introduces entity and its signature.
1821 Analyze_Subprogram_Body (N);
1822 Analyze_Proper_Body (N, Empty);
1823 end Analyze_Subprogram_Body_Stub;
1825 ---------------------
1826 -- Analyze_Subunit --
1827 ---------------------
1829 -- A subunit is compiled either by itself (for semantic checking)
1830 -- or as part of compiling the parent (for code generation). In
1831 -- either case, by the time we actually process the subunit, the
1832 -- parent has already been installed and analyzed. The node N is
1833 -- a compilation unit, whose context needs to be treated here,
1834 -- because we come directly here from the parent without calling
1835 -- Analyze_Compilation_Unit.
1837 -- The compilation context includes the explicit context of the
1838 -- subunit, and the context of the parent, together with the parent
1839 -- itself. In order to compile the current context, we remove the
1840 -- one inherited from the parent, in order to have a clean visibility
1841 -- table. We restore the parent context before analyzing the proper
1842 -- body itself. On exit, we remove only the explicit context of the
1845 procedure Analyze_Subunit (N : Node_Id) is
1846 Lib_Unit : constant Node_Id := Library_Unit (N);
1847 Par_Unit : constant Entity_Id := Current_Scope;
1849 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1850 Num_Scopes : Int := 0;
1851 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1852 Enclosing_Child : Entity_Id := Empty;
1853 Svg : constant Suppress_Array := Scope_Suppress;
1855 procedure Analyze_Subunit_Context;
1856 -- Capture names in use clauses of the subunit. This must be done
1857 -- before re-installing parent declarations, because items in the
1858 -- context must not be hidden by declarations local to the parent.
1860 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1861 -- Recursive procedure to restore scope of all ancestors of subunit,
1862 -- from outermost in. If parent is not a subunit, the call to install
1863 -- context installs context of spec and (if parent is a child unit)
1864 -- the context of its parents as well. It is confusing that parents
1865 -- should be treated differently in both cases, but the semantics are
1866 -- just not identical.
1868 procedure Re_Install_Use_Clauses;
1869 -- As part of the removal of the parent scope, the use clauses are
1870 -- removed, to be reinstalled when the context of the subunit has
1871 -- been analyzed. Use clauses may also have been affected by the
1872 -- analysis of the context of the subunit, so they have to be applied
1873 -- again, to insure that the compilation environment of the rest of
1874 -- the parent unit is identical.
1876 procedure Remove_Scope;
1877 -- Remove current scope from scope stack, and preserve the list
1878 -- of use clauses in it, to be reinstalled after context is analyzed.
1880 -----------------------------
1881 -- Analyze_Subunit_Context --
1882 -----------------------------
1884 procedure Analyze_Subunit_Context is
1887 Unit_Name : Entity_Id;
1890 Analyze_Context (N);
1892 -- Make withed units immediately visible. If child unit, make the
1893 -- ultimate parent immediately visible.
1895 Item := First (Context_Items (N));
1896 while Present (Item) loop
1897 if Nkind (Item) = N_With_Clause then
1899 -- Protect frontend against previous errors in context clauses
1901 if Nkind (Name (Item)) /= N_Selected_Component then
1902 if Error_Posted (Item) then
1906 Unit_Name := Entity (Name (Item));
1907 while Is_Child_Unit (Unit_Name) loop
1908 Set_Is_Visible_Child_Unit (Unit_Name);
1909 Unit_Name := Scope (Unit_Name);
1912 if not Is_Immediately_Visible (Unit_Name) then
1913 Set_Is_Immediately_Visible (Unit_Name);
1914 Set_Context_Installed (Item);
1919 elsif Nkind (Item) = N_Use_Package_Clause then
1920 Nam := First (Names (Item));
1921 while Present (Nam) loop
1926 elsif Nkind (Item) = N_Use_Type_Clause then
1927 Nam := First (Subtype_Marks (Item));
1928 while Present (Nam) loop
1937 -- Reset visibility of withed units. They will be made visible
1938 -- again when we install the subunit context.
1940 Item := First (Context_Items (N));
1941 while Present (Item) loop
1942 if Nkind (Item) = N_With_Clause
1944 -- Protect frontend against previous errors in context clauses
1946 and then Nkind (Name (Item)) /= N_Selected_Component
1947 and then not Error_Posted (Item)
1949 Unit_Name := Entity (Name (Item));
1950 while Is_Child_Unit (Unit_Name) loop
1951 Set_Is_Visible_Child_Unit (Unit_Name, False);
1952 Unit_Name := Scope (Unit_Name);
1955 if Context_Installed (Item) then
1956 Set_Is_Immediately_Visible (Unit_Name, False);
1957 Set_Context_Installed (Item, False);
1963 end Analyze_Subunit_Context;
1965 ------------------------
1966 -- Re_Install_Parents --
1967 ------------------------
1969 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
1973 if Nkind (Unit (L)) = N_Subunit then
1974 Re_Install_Parents (Library_Unit (L), Scope (Scop));
1977 Install_Context (L);
1979 -- If the subunit occurs within a child unit, we must restore the
1980 -- immediate visibility of any siblings that may occur in context.
1982 if Present (Enclosing_Child) then
1983 Install_Siblings (Enclosing_Child, L);
1988 if Scop /= Par_Unit then
1989 Set_Is_Immediately_Visible (Scop);
1992 -- Make entities in scope visible again. For child units, restore
1993 -- visibility only if they are actually in context.
1995 E := First_Entity (Current_Scope);
1996 while Present (E) loop
1997 if not Is_Child_Unit (E)
1998 or else Is_Visible_Child_Unit (E)
2000 Set_Is_Immediately_Visible (E);
2006 -- A subunit appears within a body, and for a nested subunits
2007 -- all the parents are bodies. Restore full visibility of their
2008 -- private entities.
2010 if Ekind (Scop) = E_Package
2011 or else Ekind (Scop) = E_Generic_Package
2013 Set_In_Package_Body (Scop);
2014 Install_Private_Declarations (Scop);
2016 end Re_Install_Parents;
2018 ----------------------------
2019 -- Re_Install_Use_Clauses --
2020 ----------------------------
2022 procedure Re_Install_Use_Clauses is
2025 for J in reverse 1 .. Num_Scopes loop
2026 U := Use_Clauses (J);
2027 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2028 Install_Use_Clauses (U, Force_Installation => True);
2030 end Re_Install_Use_Clauses;
2036 procedure Remove_Scope is
2040 Num_Scopes := Num_Scopes + 1;
2041 Use_Clauses (Num_Scopes) :=
2042 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2044 E := First_Entity (Current_Scope);
2045 while Present (E) loop
2046 Set_Is_Immediately_Visible (E, False);
2050 if Is_Child_Unit (Current_Scope) then
2051 Enclosing_Child := Current_Scope;
2057 -- Start of processing for Analyze_Subunit
2060 if not Is_Empty_List (Context_Items (N)) then
2062 -- Save current use clauses
2065 Remove_Context (Lib_Unit);
2067 -- Now remove parents and their context, including enclosing
2068 -- subunits and the outer parent body which is not a subunit.
2070 if Present (Lib_Spec) then
2071 Remove_Context (Lib_Spec);
2073 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2074 Lib_Spec := Library_Unit (Lib_Spec);
2076 Remove_Context (Lib_Spec);
2079 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2083 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2084 Remove_Context (Library_Unit (Lib_Spec));
2088 Set_Is_Immediately_Visible (Par_Unit, False);
2090 Analyze_Subunit_Context;
2092 Re_Install_Parents (Lib_Unit, Par_Unit);
2093 Set_Is_Immediately_Visible (Par_Unit);
2095 -- If the context includes a child unit of the parent of the
2096 -- subunit, the parent will have been removed from visibility,
2097 -- after compiling that cousin in the context. The visibility
2098 -- of the parent must be restored now. This also applies if the
2099 -- context includes another subunit of the same parent which in
2100 -- turn includes a child unit in its context.
2102 if Ekind (Par_Unit) = E_Package
2103 or else Ekind (Par_Unit) = E_Generic_Package
2105 if not Is_Immediately_Visible (Par_Unit)
2106 or else (Present (First_Entity (Par_Unit))
2107 and then not Is_Immediately_Visible
2108 (First_Entity (Par_Unit)))
2110 Set_Is_Immediately_Visible (Par_Unit);
2111 Install_Visible_Declarations (Par_Unit);
2112 Install_Private_Declarations (Par_Unit);
2116 Re_Install_Use_Clauses;
2117 Install_Context (N);
2119 -- Restore state of suppress flags for current body
2121 Scope_Suppress := Svg;
2123 -- If the subunit is within a child unit, then siblings of any
2124 -- parent unit that appear in the context clause of the subunit
2125 -- must also be made immediately visible.
2127 if Present (Enclosing_Child) then
2128 Install_Siblings (Enclosing_Child, N);
2133 Analyze (Proper_Body (Unit (N)));
2136 -- The subunit may contain a with_clause on a sibling of some
2137 -- ancestor. Removing the context will remove from visibility those
2138 -- ancestor child units, which must be restored to the visibility
2139 -- they have in the enclosing body.
2141 if Present (Enclosing_Child) then
2147 and then Is_Child_Unit (C)
2149 Set_Is_Immediately_Visible (C);
2150 Set_Is_Visible_Child_Unit (C);
2155 end Analyze_Subunit;
2157 ----------------------------
2158 -- Analyze_Task_Body_Stub --
2159 ----------------------------
2161 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2162 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2163 Loc : constant Source_Ptr := Sloc (N);
2166 Check_Stub_Level (N);
2168 -- First occurrence of name may have been as an incomplete type
2170 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2171 Nam := Full_View (Nam);
2175 or else not Is_Task_Type (Etype (Nam))
2177 Error_Msg_N ("missing specification for task body", N);
2179 Set_Scope (Defining_Entity (N), Current_Scope);
2180 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2181 Set_Has_Completion (Etype (Nam));
2182 Analyze_Proper_Body (N, Etype (Nam));
2184 -- Set elaboration flag to indicate that entity is callable.
2185 -- This cannot be done in the expansion of the body itself,
2186 -- because the proper body is not in a declarative part. This
2187 -- is only done if expansion is active, because the context
2188 -- may be generic and the flag not defined yet.
2190 if Expander_Active then
2192 Make_Assignment_Statement (Loc,
2194 Make_Identifier (Loc,
2195 New_External_Name (Chars (Etype (Nam)), 'E')),
2196 Expression => New_Reference_To (Standard_True, Loc)));
2200 end Analyze_Task_Body_Stub;
2202 -------------------------
2203 -- Analyze_With_Clause --
2204 -------------------------
2206 -- Analyze the declaration of a unit in a with clause. At end,
2207 -- label the with clause with the defining entity for the unit.
2209 procedure Analyze_With_Clause (N : Node_Id) is
2211 -- Retrieve the original kind of the unit node, before analysis.
2212 -- If it is a subprogram instantiation, its analysis below will
2213 -- rewrite as the declaration of the wrapper package. If the same
2214 -- instantiation appears indirectly elsewhere in the context, it
2215 -- will have been analyzed already.
2217 Unit_Kind : constant Node_Kind :=
2218 Nkind (Original_Node (Unit (Library_Unit (N))));
2219 Nam : constant Node_Id := Name (N);
2221 Par_Name : Entity_Id;
2226 -- Set True if the unit currently being compiled is an internal unit
2228 Save_Style_Check : constant Boolean := Opt.Style_Check;
2229 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
2230 Cunit_Boolean_Restrictions_Save;
2233 U := Unit (Library_Unit (N));
2235 -- Several actions are skipped for dummy packages (those supplied for
2236 -- with's where no matching file could be found). Such packages are
2237 -- identified by the Sloc value being set to No_Location.
2239 if Limited_Present (N) then
2241 -- Ada 2005 (AI-50217): Build visibility structures but do not
2242 -- analyze the unit.
2244 if Sloc (U) /= No_Location then
2245 Build_Limited_Views (N);
2251 -- We reset ordinary style checking during the analysis of a with'ed
2252 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2253 -- definitely *does* apply to with'ed units).
2255 if not GNAT_Mode then
2256 Style_Check := False;
2259 -- If the library unit is a predefined unit, and we are in high
2260 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2261 -- for the analysis of the with'ed unit. This mode does not prevent
2262 -- explicit with'ing of run-time units.
2264 if Configurable_Run_Time_Mode
2266 Is_Predefined_File_Name
2267 (Unit_File_Name (Get_Source_Unit (Unit (Library_Unit (N)))))
2269 Configurable_Run_Time_Mode := False;
2270 Semantics (Library_Unit (N));
2271 Configurable_Run_Time_Mode := True;
2274 Semantics (Library_Unit (N));
2277 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2279 if Sloc (U) /= No_Location then
2281 -- Check restrictions, except that we skip the check if this is an
2282 -- internal unit unless we are compiling the internal unit as the
2283 -- main unit. We also skip this for dummy packages.
2285 Check_Restriction_No_Dependence (Nam, N);
2287 if not Intunit or else Current_Sem_Unit = Main_Unit then
2288 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2291 -- Deal with special case of GNAT.Current_Exceptions which interacts
2292 -- with the optimization of local raise statements into gotos.
2294 if Nkind (Nam) = N_Selected_Component
2295 and then Nkind (Prefix (Nam)) = N_Identifier
2296 and then Chars (Prefix (Nam)) = Name_Gnat
2297 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2299 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2301 Check_Restriction (No_Exception_Propagation, N);
2302 Special_Exception_Package_Used := True;
2305 -- Check for inappropriate with of internal implementation unit if we
2306 -- are currently compiling the main unit and the main unit is itself
2307 -- not an internal unit. We do not issue this message for implicit
2308 -- with's generated by the compiler itself.
2310 if Implementation_Unit_Warnings
2311 and then Current_Sem_Unit = Main_Unit
2312 and then not Intunit
2313 and then not Implicit_With (N)
2314 and then not GNAT_Mode
2317 U_Kind : constant Kind_Of_Unit :=
2318 Get_Kind_Of_Unit (Get_Source_Unit (U));
2321 if U_Kind = Implementation_Unit then
2322 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2324 ("\use of this unit is non-portable " &
2325 "and version-dependent?",
2328 elsif U_Kind = Ada_05_Unit
2329 and then Ada_Version < Ada_05
2330 and then Warn_On_Ada_2005_Compatibility
2332 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2338 -- Semantic analysis of a generic unit is performed on a copy of
2339 -- the original tree. Retrieve the entity on which semantic info
2340 -- actually appears.
2342 if Unit_Kind in N_Generic_Declaration then
2343 E_Name := Defining_Entity (U);
2345 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2346 -- the case of an instantiation, semantic analysis above will have
2347 -- replaced the unit by its instantiated version. If the instance body
2348 -- has been generated, the instance now denotes the body entity. For
2349 -- visibility purposes we need the entity of its spec.
2351 elsif (Unit_Kind = N_Package_Instantiation
2352 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2353 N_Package_Instantiation)
2354 and then Nkind (U) = N_Package_Body
2356 E_Name := Corresponding_Spec (U);
2358 elsif Unit_Kind = N_Package_Instantiation
2359 and then Nkind (U) = N_Package_Instantiation
2361 -- If the instance has not been rewritten as a package declaration,
2362 -- then it appeared already in a previous with clause. Retrieve
2363 -- the entity from the previous instance.
2365 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2367 elsif Unit_Kind in N_Subprogram_Instantiation then
2369 -- Instantiation node is replaced with a wrapper package. Retrieve
2370 -- the visible subprogram created by the instance from corresponding
2371 -- attribute of the wrapper.
2373 E_Name := Related_Instance (Defining_Entity (U));
2375 elsif Unit_Kind = N_Package_Renaming_Declaration
2376 or else Unit_Kind in N_Generic_Renaming_Declaration
2378 E_Name := Defining_Entity (U);
2380 elsif Unit_Kind = N_Subprogram_Body
2381 and then Nkind (Name (N)) = N_Selected_Component
2382 and then not Acts_As_Spec (Library_Unit (N))
2384 -- For a child unit that has no spec, one has been created and
2385 -- analyzed. The entity required is that of the spec.
2387 E_Name := Corresponding_Spec (U);
2390 E_Name := Defining_Entity (U);
2393 if Nkind (Name (N)) = N_Selected_Component then
2395 -- Child unit in a with clause
2397 Change_Selected_Component_To_Expanded_Name (Name (N));
2400 -- Restore style checks and restrictions
2402 Style_Check := Save_Style_Check;
2403 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2405 -- Record the reference, but do NOT set the unit as referenced, we want
2406 -- to consider the unit as unreferenced if this is the only reference
2409 Set_Entity_With_Style_Check (Name (N), E_Name);
2410 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2412 if Is_Child_Unit (E_Name) then
2413 Pref := Prefix (Name (N));
2414 Par_Name := Scope (E_Name);
2415 while Nkind (Pref) = N_Selected_Component loop
2416 Change_Selected_Component_To_Expanded_Name (Pref);
2417 Set_Entity_With_Style_Check (Pref, Par_Name);
2419 Generate_Reference (Par_Name, Pref);
2420 Pref := Prefix (Pref);
2422 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2423 -- is set to Standard_Standard, and no attempt should be made to
2424 -- further unwind scopes.
2426 if Par_Name /= Standard_Standard then
2427 Par_Name := Scope (Par_Name);
2431 if Present (Entity (Pref))
2432 and then not Analyzed (Parent (Parent (Entity (Pref))))
2434 -- If the entity is set without its unit being compiled, the
2435 -- original parent is a renaming, and Par_Name is the renamed
2436 -- entity. For visibility purposes, we need the original entity,
2437 -- which must be analyzed now because Load_Unit directly retrieves
2438 -- the renamed unit, and the renaming declaration itself has not
2441 Analyze (Parent (Parent (Entity (Pref))));
2442 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2443 Par_Name := Entity (Pref);
2446 Set_Entity_With_Style_Check (Pref, Par_Name);
2447 Generate_Reference (Par_Name, Pref);
2450 -- If the withed unit is System, and a system extension pragma is
2451 -- present, compile the extension now, rather than waiting for a
2452 -- visibility check on a specific entity.
2454 if Chars (E_Name) = Name_System
2455 and then Scope (E_Name) = Standard_Standard
2456 and then Present (System_Extend_Unit)
2457 and then Present_System_Aux (N)
2459 -- If the extension is not present, an error will have been emitted
2464 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2465 -- to private_with units; they will be made visible later (just before
2466 -- the private part is analyzed)
2468 if Private_Present (N) then
2469 Set_Is_Immediately_Visible (E_Name, False);
2471 end Analyze_With_Clause;
2473 ------------------------------
2474 -- Check_Private_Child_Unit --
2475 ------------------------------
2477 procedure Check_Private_Child_Unit (N : Node_Id) is
2478 Lib_Unit : constant Node_Id := Unit (N);
2480 Curr_Unit : Entity_Id;
2481 Sub_Parent : Node_Id;
2482 Priv_Child : Entity_Id;
2483 Par_Lib : Entity_Id;
2486 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2487 -- Returns true if and only if the library unit is declared with
2488 -- an explicit designation of private.
2490 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2491 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2494 return Private_Present (Comp_Unit);
2495 end Is_Private_Library_Unit;
2497 -- Start of processing for Check_Private_Child_Unit
2500 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2501 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2502 Par_Lib := Curr_Unit;
2504 elsif Nkind (Lib_Unit) = N_Subunit then
2506 -- The parent is itself a body. The parent entity is to be found in
2507 -- the corresponding spec.
2509 Sub_Parent := Library_Unit (N);
2510 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2512 -- If the parent itself is a subunit, Curr_Unit is the entity
2513 -- of the enclosing body, retrieve the spec entity which is
2514 -- the proper ancestor we need for the following tests.
2516 if Ekind (Curr_Unit) = E_Package_Body then
2517 Curr_Unit := Spec_Entity (Curr_Unit);
2520 Par_Lib := Curr_Unit;
2523 Curr_Unit := Defining_Entity (Lib_Unit);
2525 Par_Lib := Curr_Unit;
2526 Par_Spec := Parent_Spec (Lib_Unit);
2528 if No (Par_Spec) then
2531 Par_Lib := Defining_Entity (Unit (Par_Spec));
2535 -- Loop through context items
2537 Item := First (Context_Items (N));
2538 while Present (Item) loop
2540 -- Ada 2005 (AI-262): Allow private_with of a private child package
2541 -- in public siblings
2543 if Nkind (Item) = N_With_Clause
2544 and then not Implicit_With (Item)
2545 and then not Limited_Present (Item)
2546 and then Is_Private_Descendant (Entity (Name (Item)))
2548 Priv_Child := Entity (Name (Item));
2551 Curr_Parent : Entity_Id := Par_Lib;
2552 Child_Parent : Entity_Id := Scope (Priv_Child);
2553 Prv_Ancestor : Entity_Id := Child_Parent;
2554 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2557 -- If the child unit is a public child then locate the nearest
2558 -- private ancestor. Child_Parent will then be set to the
2559 -- parent of that ancestor.
2561 if not Is_Private_Library_Unit (Priv_Child) then
2562 while Present (Prv_Ancestor)
2563 and then not Is_Private_Library_Unit (Prv_Ancestor)
2565 Prv_Ancestor := Scope (Prv_Ancestor);
2568 if Present (Prv_Ancestor) then
2569 Child_Parent := Scope (Prv_Ancestor);
2573 while Present (Curr_Parent)
2574 and then Curr_Parent /= Standard_Standard
2575 and then Curr_Parent /= Child_Parent
2578 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2579 Curr_Parent := Scope (Curr_Parent);
2582 if No (Curr_Parent) then
2583 Curr_Parent := Standard_Standard;
2586 if Curr_Parent /= Child_Parent then
2587 if Ekind (Priv_Child) = E_Generic_Package
2588 and then Chars (Priv_Child) in Text_IO_Package_Name
2589 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2592 ("& is a nested package, not a compilation unit",
2593 Name (Item), Priv_Child);
2597 ("unit in with clause is private child unit!", Item);
2599 ("\current unit must also have parent&!",
2600 Item, Child_Parent);
2604 or else Private_Present (Item)
2605 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2606 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2607 and then not Acts_As_Spec (Parent (Lib_Unit)))
2613 ("current unit must also be private descendant of&",
2614 Item, Child_Parent);
2622 end Check_Private_Child_Unit;
2624 ----------------------
2625 -- Check_Stub_Level --
2626 ----------------------
2628 procedure Check_Stub_Level (N : Node_Id) is
2629 Par : constant Node_Id := Parent (N);
2630 Kind : constant Node_Kind := Nkind (Par);
2633 if Nkind_In (Kind, N_Package_Body,
2637 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2641 -- In an instance, a missing stub appears at any level. A warning
2642 -- message will have been emitted already for the missing file.
2644 elsif not In_Instance then
2645 Error_Msg_N ("stub cannot appear in an inner scope", N);
2647 elsif Expander_Active then
2648 Error_Msg_N ("missing proper body", N);
2650 end Check_Stub_Level;
2652 ------------------------
2653 -- Expand_With_Clause --
2654 ------------------------
2656 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2657 Loc : constant Source_Ptr := Sloc (Nam);
2658 Ent : constant Entity_Id := Entity (Nam);
2662 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2663 -- Build name to be used in implicit with_clause. In most cases this
2664 -- is the source name, but if renamings are present we must make the
2665 -- original unit visible, not the one it renames. The entity in the
2666 -- use clause is the renamed unit, but the identifier is the one from
2667 -- the source, which allows us to recover the unit renaming.
2669 ---------------------
2670 -- Build_Unit_Name --
2671 ---------------------
2673 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2675 Renaming : Entity_Id;
2679 if Nkind (Nam) = N_Identifier then
2681 -- If the parent unit P in the name of the with_clause for P.Q
2682 -- is a renaming of package R, then the entity of the parent is
2683 -- set to R, but the identifier retains Chars (P) to be consistent
2684 -- with the source (see details in lib-load). However, the
2685 -- implicit_with_clause for the parent must make the entity for
2686 -- P visible, because P.Q may be used as a prefix within the
2687 -- current unit. The entity for P is the current_entity with that
2688 -- name, because the package renaming declaration for it has just
2689 -- been analyzed. Note that this case can only happen if P.Q has
2690 -- already appeared in a previous with_clause in a related unit,
2691 -- such as the library body of the current unit.
2693 if Chars (Nam) /= Chars (Entity (Nam)) then
2694 Renaming := Current_Entity (Nam);
2695 pragma Assert (Renamed_Entity (Renaming) = Entity (Nam));
2696 return New_Occurrence_Of (Renaming, Loc);
2699 return New_Occurrence_Of (Entity (Nam), Loc);
2703 Ent := Entity (Nam);
2705 if Present (Entity (Selector_Name (Nam)))
2706 and then Chars (Entity (Selector_Name (Nam))) /= Chars (Ent)
2708 Nkind (Unit_Declaration_Node (Entity (Selector_Name (Nam))))
2709 = N_Package_Renaming_Declaration
2711 -- The name in the with_clause is of the form A.B.C, and B
2712 -- is given by a renaming declaration. In that case we may
2713 -- not have analyzed the unit for B, but replaced it directly
2714 -- in lib-load with the unit it renames. We have to make A.B
2715 -- visible, so analyze the declaration for B now, in case it
2716 -- has not been done yet.
2718 Ent := Entity (Selector_Name (Nam));
2721 (Unit_Declaration_Node (Entity (Selector_Name (Nam)))));
2725 Make_Expanded_Name (Loc,
2726 Chars => Chars (Entity (Nam)),
2727 Prefix => Build_Unit_Name (Prefix (Nam)),
2728 Selector_Name => New_Occurrence_Of (Ent, Loc));
2729 Set_Entity (Result, Ent);
2732 end Build_Unit_Name;
2734 -- Start of processing for Expand_With_Clause
2737 New_Nodes_OK := New_Nodes_OK + 1;
2739 Make_With_Clause (Loc,
2740 Name => Build_Unit_Name (Nam));
2742 P := Parent (Unit_Declaration_Node (Ent));
2743 Set_Library_Unit (Withn, P);
2744 Set_Corresponding_Spec (Withn, Ent);
2745 Set_First_Name (Withn, True);
2746 Set_Implicit_With (Withn, True);
2748 -- If the unit is a package declaration, a private_with_clause on a
2749 -- child unit implies that the implicit with on the parent is also
2752 if Nkind (Unit (N)) = N_Package_Declaration then
2753 Set_Private_Present (Withn, Private_Present (Item));
2756 Prepend (Withn, Context_Items (N));
2757 Mark_Rewrite_Insertion (Withn);
2758 Install_Withed_Unit (Withn);
2760 if Nkind (Nam) = N_Expanded_Name then
2761 Expand_With_Clause (Item, Prefix (Nam), N);
2764 New_Nodes_OK := New_Nodes_OK - 1;
2765 end Expand_With_Clause;
2767 -----------------------
2768 -- Get_Parent_Entity --
2769 -----------------------
2771 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2773 if Nkind (Unit) = N_Package_Body
2774 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2776 return Defining_Entity
2777 (Specification (Instance_Spec (Original_Node (Unit))));
2778 elsif Nkind (Unit) = N_Package_Instantiation then
2779 return Defining_Entity (Specification (Instance_Spec (Unit)));
2781 return Defining_Entity (Unit);
2783 end Get_Parent_Entity;
2785 -----------------------------
2786 -- Implicit_With_On_Parent --
2787 -----------------------------
2789 procedure Implicit_With_On_Parent
2790 (Child_Unit : Node_Id;
2793 Loc : constant Source_Ptr := Sloc (N);
2794 P : constant Node_Id := Parent_Spec (Child_Unit);
2795 P_Unit : Node_Id := Unit (P);
2796 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
2799 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
2800 -- Build prefix of child unit name. Recurse if needed
2802 function Build_Unit_Name return Node_Id;
2803 -- If the unit is a child unit, build qualified name with all ancestors
2805 -------------------------
2806 -- Build_Ancestor_Name --
2807 -------------------------
2809 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
2810 P_Ref : constant Node_Id :=
2811 New_Reference_To (Defining_Entity (P), Loc);
2812 P_Spec : Node_Id := P;
2815 -- Ancestor may have been rewritten as a package body. Retrieve
2816 -- the original spec to trace earlier ancestors.
2818 if Nkind (P) = N_Package_Body
2819 and then Nkind (Original_Node (P)) = N_Package_Instantiation
2821 P_Spec := Original_Node (P);
2824 if No (Parent_Spec (P_Spec)) then
2828 Make_Selected_Component (Loc,
2829 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
2830 Selector_Name => P_Ref);
2832 end Build_Ancestor_Name;
2834 ---------------------
2835 -- Build_Unit_Name --
2836 ---------------------
2838 function Build_Unit_Name return Node_Id is
2841 if No (Parent_Spec (P_Unit)) then
2842 return New_Reference_To (P_Name, Loc);
2845 Make_Expanded_Name (Loc,
2846 Chars => Chars (P_Name),
2847 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
2848 Selector_Name => New_Reference_To (P_Name, Loc));
2849 Set_Entity (Result, P_Name);
2852 end Build_Unit_Name;
2854 -- Start of processing for Implicit_With_On_Parent
2857 -- The unit of the current compilation may be a package body that
2858 -- replaces an instance node. In this case we need the original instance
2859 -- node to construct the proper parent name.
2861 if Nkind (P_Unit) = N_Package_Body
2862 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
2864 P_Unit := Original_Node (P_Unit);
2867 -- We add the implicit with if the child unit is the current unit being
2868 -- compiled. If the current unit is a body, we do not want to add an
2869 -- implicit_with a second time to the corresponding spec.
2871 if Nkind (Child_Unit) = N_Package_Declaration
2872 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
2877 New_Nodes_OK := New_Nodes_OK + 1;
2878 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
2880 Set_Library_Unit (Withn, P);
2881 Set_Corresponding_Spec (Withn, P_Name);
2882 Set_First_Name (Withn, True);
2883 Set_Implicit_With (Withn, True);
2885 -- Node is placed at the beginning of the context items, so that
2886 -- subsequent use clauses on the parent can be validated.
2888 Prepend (Withn, Context_Items (N));
2889 Mark_Rewrite_Insertion (Withn);
2890 Install_Withed_Unit (Withn);
2892 if Is_Child_Spec (P_Unit) then
2893 Implicit_With_On_Parent (P_Unit, N);
2896 New_Nodes_OK := New_Nodes_OK - 1;
2897 end Implicit_With_On_Parent;
2903 function In_Chain (E : Entity_Id) return Boolean is
2907 H := Current_Entity (E);
2908 while Present (H) loop
2919 ---------------------
2920 -- Install_Context --
2921 ---------------------
2923 procedure Install_Context (N : Node_Id) is
2924 Lib_Unit : constant Node_Id := Unit (N);
2927 Install_Context_Clauses (N);
2929 if Is_Child_Spec (Lib_Unit) then
2930 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
2933 Install_Limited_Context_Clauses (N);
2934 end Install_Context;
2936 -----------------------------
2937 -- Install_Context_Clauses --
2938 -----------------------------
2940 procedure Install_Context_Clauses (N : Node_Id) is
2941 Lib_Unit : constant Node_Id := Unit (N);
2943 Uname_Node : Entity_Id;
2944 Check_Private : Boolean := False;
2945 Decl_Node : Node_Id;
2946 Lib_Parent : Entity_Id;
2949 -- First skip configuration pragmas at the start of the context. They
2950 -- are not technically part of the context clause, but that's where the
2951 -- parser puts them. Note they were analyzed in Analyze_Context.
2953 Item := First (Context_Items (N));
2954 while Present (Item)
2955 and then Nkind (Item) = N_Pragma
2956 and then Pragma_Name (Item) in Configuration_Pragma_Names
2961 -- Loop through the actual context clause items. We process everything
2962 -- except Limited_With clauses in this routine. Limited_With clauses
2963 -- are separately installed (see Install_Limited_Context_Clauses).
2965 while Present (Item) loop
2967 -- Case of explicit WITH clause
2969 if Nkind (Item) = N_With_Clause
2970 and then not Implicit_With (Item)
2972 if Limited_Present (Item) then
2974 -- Limited withed units will be installed later
2978 -- If Name (Item) is not an entity name, something is wrong, and
2979 -- this will be detected in due course, for now ignore the item
2981 elsif not Is_Entity_Name (Name (Item)) then
2984 elsif No (Entity (Name (Item))) then
2985 Set_Entity (Name (Item), Any_Id);
2989 Uname_Node := Entity (Name (Item));
2991 if Is_Private_Descendant (Uname_Node) then
2992 Check_Private := True;
2995 Install_Withed_Unit (Item);
2997 Decl_Node := Unit_Declaration_Node (Uname_Node);
2999 -- If the unit is a subprogram instance, it appears nested within
3000 -- a package that carries the parent information.
3002 if Is_Generic_Instance (Uname_Node)
3003 and then Ekind (Uname_Node) /= E_Package
3005 Decl_Node := Parent (Parent (Decl_Node));
3008 if Is_Child_Spec (Decl_Node) then
3009 if Nkind (Name (Item)) = N_Expanded_Name then
3010 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3012 -- If not an expanded name, the child unit must be a
3013 -- renaming, nothing to do.
3018 elsif Nkind (Decl_Node) = N_Subprogram_Body
3019 and then not Acts_As_Spec (Parent (Decl_Node))
3020 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3022 Implicit_With_On_Parent
3023 (Unit (Library_Unit (Parent (Decl_Node))), N);
3026 -- Check license conditions unless this is a dummy unit
3028 if Sloc (Library_Unit (Item)) /= No_Location then
3029 License_Check : declare
3031 Withu : constant Unit_Number_Type :=
3032 Get_Source_Unit (Library_Unit (Item));
3034 Withl : constant License_Type :=
3035 License (Source_Index (Withu));
3037 Unitl : constant License_Type :=
3038 License (Source_Index (Current_Sem_Unit));
3040 procedure License_Error;
3041 -- Signal error of bad license
3047 procedure License_Error is
3050 ("?license of with'ed unit & may be inconsistent",
3054 -- Start of processing for License_Check
3057 -- Exclude license check if withed unit is an internal unit.
3058 -- This situation arises e.g. with the GPL version of GNAT.
3060 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3063 -- Otherwise check various cases
3075 if Withl = Restricted then
3079 when Modified_GPL =>
3080 if Withl = Restricted or else Withl = GPL then
3084 when Unrestricted =>
3091 -- Case of USE PACKAGE clause
3093 elsif Nkind (Item) = N_Use_Package_Clause then
3094 Analyze_Use_Package (Item);
3096 -- Case of USE TYPE clause
3098 elsif Nkind (Item) = N_Use_Type_Clause then
3099 Analyze_Use_Type (Item);
3103 elsif Nkind (Item) = N_Pragma then
3111 if Is_Child_Spec (Lib_Unit) then
3113 -- The unit also has implicit withs on its own parents
3115 if No (Context_Items (N)) then
3116 Set_Context_Items (N, New_List);
3119 Implicit_With_On_Parent (Lib_Unit, N);
3122 -- If the unit is a body, the context of the specification must also
3125 if Nkind (Lib_Unit) = N_Package_Body
3126 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3127 and then not Acts_As_Spec (N))
3129 Install_Context (Library_Unit (N));
3131 if Is_Child_Spec (Unit (Library_Unit (N))) then
3133 -- If the unit is the body of a public child unit, the private
3134 -- declarations of the parent must be made visible. If the child
3135 -- unit is private, the private declarations have been installed
3136 -- already in the call to Install_Parents for the spec. Installing
3137 -- private declarations must be done for all ancestors of public
3138 -- child units. In addition, sibling units mentioned in the
3139 -- context clause of the body are directly visible.
3147 Lib_Spec := Unit (Library_Unit (N));
3148 while Is_Child_Spec (Lib_Spec) loop
3149 P := Unit (Parent_Spec (Lib_Spec));
3150 P_Name := Defining_Entity (P);
3152 if not (Private_Present (Parent (Lib_Spec)))
3153 and then not In_Private_Part (P_Name)
3155 Install_Private_Declarations (P_Name);
3156 Install_Private_With_Clauses (P_Name);
3157 Set_Use (Private_Declarations (Specification (P)));
3165 -- For a package body, children in context are immediately visible
3167 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3170 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3171 N_Generic_Subprogram_Declaration,
3172 N_Package_Declaration,
3173 N_Subprogram_Declaration)
3175 if Is_Child_Spec (Lib_Unit) then
3176 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3177 Set_Is_Private_Descendant
3178 (Defining_Entity (Lib_Unit),
3179 Is_Private_Descendant (Lib_Parent)
3180 or else Private_Present (Parent (Lib_Unit)));
3183 Set_Is_Private_Descendant
3184 (Defining_Entity (Lib_Unit),
3185 Private_Present (Parent (Lib_Unit)));
3189 if Check_Private then
3190 Check_Private_Child_Unit (N);
3192 end Install_Context_Clauses;
3194 -------------------------------------
3195 -- Install_Limited_Context_Clauses --
3196 -------------------------------------
3198 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3201 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3202 -- Check that the unlimited view of a given compilation_unit is not
3203 -- already visible through "use + renamings".
3205 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3206 -- Check that if a limited_with clause of a given compilation_unit
3207 -- mentions a descendant of a private child of some library unit,
3208 -- then the given compilation_unit shall be the declaration of a
3209 -- private descendant of that library unit, or a public descendant
3210 -- of such. The code is analogous to that of Check_Private_Child_Unit
3211 -- but we cannot use entities on the limited with_clauses because
3212 -- their units have not been analyzed, so we have to climb the tree
3213 -- of ancestors looking for private keywords.
3215 procedure Expand_Limited_With_Clause
3216 (Comp_Unit : Node_Id;
3219 -- If a child unit appears in a limited_with clause, there are implicit
3220 -- limited_with clauses on all parents that are not already visible
3221 -- through a regular with clause. This procedure creates the implicit
3222 -- limited with_clauses for the parents and loads the corresponding
3223 -- units. The shadow entities are created when the inserted clause is
3224 -- analyzed. Implements Ada 2005 (AI-50217).
3226 ---------------------
3227 -- Check_Renamings --
3228 ---------------------
3230 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3239 pragma Assert (Nkind (W) = N_With_Clause);
3241 -- Protect the frontend against previous critical errors
3243 case Nkind (Unit (Library_Unit (W))) is
3244 when N_Subprogram_Declaration |
3245 N_Package_Declaration |
3246 N_Generic_Subprogram_Declaration |
3247 N_Generic_Package_Declaration =>
3254 -- Check "use + renamings"
3256 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3257 Spec := Specification (Unit (P));
3259 Item := First (Visible_Declarations (Spec));
3260 while Present (Item) loop
3262 -- Look only at use package clauses
3264 if Nkind (Item) = N_Use_Package_Clause then
3266 -- Traverse the list of packages
3268 Nam := First (Names (Item));
3269 while Present (Nam) loop
3272 pragma Assert (Present (Parent (E)));
3274 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3275 and then Renamed_Entity (E) = WEnt
3277 -- The unlimited view is visible through use clause and
3278 -- renamings. There is not need to generate the error
3279 -- message here because Is_Visible_Through_Renamings
3280 -- takes care of generating the precise error message.
3284 elsif Nkind (Parent (E)) = N_Package_Specification then
3286 -- The use clause may refer to a local package.
3287 -- Check all the enclosing scopes.
3290 while E2 /= Standard_Standard
3298 ("unlimited view visible through use clause ", W);
3310 -- Recursive call to check all the ancestors
3312 if Is_Child_Spec (Unit (P)) then
3313 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3315 end Check_Renamings;
3317 ---------------------------------------
3318 -- Check_Private_Limited_Withed_Unit --
3319 ---------------------------------------
3321 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3322 Curr_Parent : Node_Id;
3323 Child_Parent : Node_Id;
3324 Curr_Private : Boolean;
3327 -- Compilation unit of the parent of the withed library unit
3329 Child_Parent := Library_Unit (Item);
3331 -- If the child unit is a public child, then locate its nearest
3332 -- private ancestor, if any; Child_Parent will then be set to
3333 -- the parent of that ancestor.
3335 if not Private_Present (Library_Unit (Item)) then
3336 while Present (Child_Parent)
3337 and then not Private_Present (Child_Parent)
3339 Child_Parent := Parent_Spec (Unit (Child_Parent));
3342 if No (Child_Parent) then
3347 Child_Parent := Parent_Spec (Unit (Child_Parent));
3349 -- Traverse all the ancestors of the current compilation
3350 -- unit to check if it is a descendant of named library unit.
3352 Curr_Parent := Parent (Item);
3353 Curr_Private := Private_Present (Curr_Parent);
3355 while Present (Parent_Spec (Unit (Curr_Parent)))
3356 and then Curr_Parent /= Child_Parent
3358 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3359 Curr_Private := Curr_Private or else Private_Present (Curr_Parent);
3362 if Curr_Parent /= Child_Parent then
3364 ("unit in with clause is private child unit!", Item);
3366 ("\current unit must also have parent&!",
3367 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3369 elsif Private_Present (Parent (Item))
3370 or else Curr_Private
3371 or else Private_Present (Item)
3372 or else Nkind_In (Unit (Parent (Item)), N_Package_Body,
3376 -- Current unit is private, of descendant of a private unit.
3382 ("current unit must also be private descendant of&",
3383 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3385 end Check_Private_Limited_Withed_Unit;
3387 --------------------------------
3388 -- Expand_Limited_With_Clause --
3389 --------------------------------
3391 procedure Expand_Limited_With_Clause
3392 (Comp_Unit : Node_Id;
3396 Loc : constant Source_Ptr := Sloc (Nam);
3397 Unum : Unit_Number_Type;
3400 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3401 -- Returns true if the context already includes a with_clause for
3402 -- this unit. If the with_clause is non-limited, the unit is fully
3403 -- visible and an implicit limited_with should not be created. If
3404 -- there is already a limited_with clause for W, a second one is
3405 -- simply redundant.
3407 --------------------------
3408 -- Previous_Withed_Unit --
3409 --------------------------
3411 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3415 -- A limited with_clause cannot appear in the same context_clause
3416 -- as a nonlimited with_clause which mentions the same library.
3418 Item := First (Context_Items (Comp_Unit));
3419 while Present (Item) loop
3420 if Nkind (Item) = N_With_Clause
3421 and then Library_Unit (Item) = Library_Unit (W)
3430 end Previous_Withed_Unit;
3432 -- Start of processing for Expand_Limited_With_Clause
3435 New_Nodes_OK := New_Nodes_OK + 1;
3437 if Nkind (Nam) = N_Identifier then
3439 -- Create node for name of withed unit
3442 Make_With_Clause (Loc,
3443 Name => New_Copy (Nam));
3445 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3447 Make_With_Clause (Loc,
3448 Name => Make_Selected_Component (Loc,
3449 Prefix => New_Copy_Tree (Prefix (Nam)),
3450 Selector_Name => New_Copy (Selector_Name (Nam))));
3451 Set_Parent (Withn, Parent (N));
3454 Set_Limited_Present (Withn);
3455 Set_First_Name (Withn);
3456 Set_Implicit_With (Withn);
3460 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3465 -- Do not generate a limited_with_clause on the current unit.
3466 -- This path is taken when a unit has a limited_with clause on
3467 -- one of its child units.
3469 if Unum = Current_Sem_Unit then
3473 Set_Library_Unit (Withn, Cunit (Unum));
3474 Set_Corresponding_Spec
3475 (Withn, Specification (Unit (Cunit (Unum))));
3477 if not Previous_Withed_Unit (Withn) then
3478 Prepend (Withn, Context_Items (Parent (N)));
3479 Mark_Rewrite_Insertion (Withn);
3481 -- Add implicit limited_with_clauses for parents of child units
3482 -- mentioned in limited_with clauses.
3484 if Nkind (Nam) = N_Selected_Component then
3485 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3490 if not Limited_View_Installed (Withn) then
3491 Install_Limited_Withed_Unit (Withn);
3495 New_Nodes_OK := New_Nodes_OK - 1;
3496 end Expand_Limited_With_Clause;
3498 -- Start of processing for Install_Limited_Context_Clauses
3501 Item := First (Context_Items (N));
3502 while Present (Item) loop
3503 if Nkind (Item) = N_With_Clause
3504 and then Limited_Present (Item)
3506 if Nkind (Name (Item)) = N_Selected_Component then
3507 Expand_Limited_With_Clause
3508 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3511 Check_Private_Limited_Withed_Unit (Item);
3513 if not Implicit_With (Item)
3514 and then Is_Child_Spec (Unit (N))
3516 Check_Renamings (Parent_Spec (Unit (N)), Item);
3519 -- A unit may have a limited with on itself if it has a limited
3520 -- with_clause on one of its child units. In that case it is
3521 -- already being compiled and it makes no sense to install its
3524 -- If the item is a limited_private_with_clause, install it if the
3525 -- current unit is a body or if it is a private child. Otherwise
3526 -- the private clause is installed before analyzing the private
3527 -- part of the current unit.
3529 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3530 and then not Limited_View_Installed (Item)
3532 if not Private_Present (Item)
3533 or else Private_Present (N)
3534 or else Nkind_In (Unit (N), N_Package_Body,
3538 Install_Limited_Withed_Unit (Item);
3542 -- All items other than Limited_With clauses are ignored (they were
3543 -- installed separately early on by Install_Context_Clause).
3552 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3553 -- spec, looking for incomplete subtype declarations of incomplete
3554 -- types visible through a limited with clause.
3556 if Ada_Version >= Ada_05
3557 and then Analyzed (N)
3558 and then Nkind (Unit (N)) = N_Package_Declaration
3563 Non_Lim_View : Entity_Id;
3566 Decl := First (Visible_Declarations (Specification (Unit (N))));
3567 while Present (Decl) loop
3568 if Nkind (Decl) = N_Subtype_Declaration
3570 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3572 From_With_Type (Defining_Identifier (Decl))
3574 Def_Id := Defining_Identifier (Decl);
3575 Non_Lim_View := Non_Limited_View (Def_Id);
3577 if not Is_Incomplete_Type (Non_Lim_View) then
3579 -- Convert an incomplete subtype declaration into a
3580 -- corresponding non-limited view subtype declaration.
3581 -- This is usually the case when analyzing a body that
3582 -- has regular with-clauses, when the spec has limited
3585 -- If the non-limited view is still incomplete, it is
3586 -- the dummy entry already created, and the declaration
3587 -- cannot be reanalyzed. This is the case when installing
3588 -- a parent unit that has limited with-clauses.
3590 Set_Subtype_Indication (Decl,
3591 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3592 Set_Etype (Def_Id, Non_Lim_View);
3593 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3594 Set_Analyzed (Decl, False);
3596 -- Reanalyze the declaration, suppressing the call to
3597 -- Enter_Name to avoid duplicate names.
3599 Analyze_Subtype_Declaration
3609 end Install_Limited_Context_Clauses;
3611 ---------------------
3612 -- Install_Parents --
3613 ---------------------
3615 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3622 P := Unit (Parent_Spec (Lib_Unit));
3623 P_Name := Get_Parent_Entity (P);
3625 if Etype (P_Name) = Any_Type then
3629 if Ekind (P_Name) = E_Generic_Package
3630 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3631 N_Generic_Package_Declaration)
3632 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3635 ("child of a generic package must be a generic unit", Lib_Unit);
3637 elsif not Is_Package_Or_Generic_Package (P_Name) then
3639 ("parent unit must be package or generic package", Lib_Unit);
3640 raise Unrecoverable_Error;
3642 elsif Present (Renamed_Object (P_Name)) then
3643 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3644 raise Unrecoverable_Error;
3646 -- Verify that a child of an instance is itself an instance, or the
3647 -- renaming of one. Given that an instance that is a unit is replaced
3648 -- with a package declaration, check against the original node. The
3649 -- parent may be currently being instantiated, in which case it appears
3650 -- as a declaration, but the generic_parent is already established
3651 -- indicating that we deal with an instance.
3653 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3654 if Nkind (Lib_Unit) in N_Renaming_Declaration
3655 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3657 (Nkind (Lib_Unit) = N_Package_Declaration
3658 and then Present (Generic_Parent (Specification (Lib_Unit))))
3663 ("child of an instance must be an instance or renaming",
3668 -- This is the recursive call that ensures all parents are loaded
3670 if Is_Child_Spec (P) then
3672 Is_Private or else Private_Present (Parent (Lib_Unit)));
3675 -- Now we can install the context for this parent
3677 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3678 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3679 Install_Siblings (P_Name, Parent (Lib_Unit));
3681 -- The child unit is in the declarative region of the parent. The parent
3682 -- must therefore appear in the scope stack and be visible, as when
3683 -- compiling the corresponding body. If the child unit is private or it
3684 -- is a package body, private declarations must be accessible as well.
3685 -- Use declarations in the parent must also be installed. Finally, other
3686 -- child units of the same parent that are in the context are
3687 -- immediately visible.
3689 -- Find entity for compilation unit, and set its private descendant
3690 -- status as needed.
3692 E_Name := Defining_Entity (Lib_Unit);
3694 Set_Is_Child_Unit (E_Name);
3696 Set_Is_Private_Descendant (E_Name,
3697 Is_Private_Descendant (P_Name)
3698 or else Private_Present (Parent (Lib_Unit)));
3700 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3701 Push_Scope (P_Name);
3703 -- Save current visibility of unit
3705 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3706 Is_Immediately_Visible (P_Name);
3707 Set_Is_Immediately_Visible (P_Name);
3708 Install_Visible_Declarations (P_Name);
3709 Set_Use (Visible_Declarations (P_Spec));
3711 -- If the parent is a generic unit, its formal part may contain formal
3712 -- packages and use clauses for them.
3714 if Ekind (P_Name) = E_Generic_Package then
3715 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3719 or else Private_Present (Parent (Lib_Unit))
3721 Install_Private_Declarations (P_Name);
3722 Install_Private_With_Clauses (P_Name);
3723 Set_Use (Private_Declarations (P_Spec));
3725 end Install_Parents;
3727 ----------------------------------
3728 -- Install_Private_With_Clauses --
3729 ----------------------------------
3731 procedure Install_Private_With_Clauses (P : Entity_Id) is
3732 Decl : constant Node_Id := Unit_Declaration_Node (P);
3736 if Debug_Flag_I then
3737 Write_Str ("install private with clauses of ");
3738 Write_Name (Chars (P));
3742 if Nkind (Parent (Decl)) = N_Compilation_Unit then
3743 Item := First (Context_Items (Parent (Decl)));
3744 while Present (Item) loop
3745 if Nkind (Item) = N_With_Clause
3746 and then Private_Present (Item)
3748 if Limited_Present (Item) then
3749 if not Limited_View_Installed (Item) then
3750 Install_Limited_Withed_Unit (Item);
3753 Install_Withed_Unit (Item, Private_With_OK => True);
3760 end Install_Private_With_Clauses;
3762 ----------------------
3763 -- Install_Siblings --
3764 ----------------------
3766 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
3772 -- Iterate over explicit with clauses, and check whether the scope of
3773 -- each entity is an ancestor of the current unit, in which case it is
3774 -- immediately visible.
3776 Item := First (Context_Items (N));
3777 while Present (Item) loop
3779 -- Do not install private_with_clauses declaration, unless
3780 -- unit is itself a private child unit, or is a body.
3781 -- Note that for a subprogram body the private_with_clause does
3782 -- not take effect until after the specification.
3784 if Nkind (Item) /= N_With_Clause
3785 or else Implicit_With (Item)
3786 or else Limited_Present (Item)
3790 elsif not Private_Present (Item)
3791 or else Private_Present (N)
3792 or else Nkind (Unit (N)) = N_Package_Body
3794 Id := Entity (Name (Item));
3796 if Is_Child_Unit (Id)
3797 and then Is_Ancestor_Package (Scope (Id), U_Name)
3799 Set_Is_Immediately_Visible (Id);
3801 -- Check for the presence of another unit in the context,
3802 -- that may be inadvertently hidden by the child.
3804 Prev := Current_Entity (Id);
3807 and then Is_Immediately_Visible (Prev)
3808 and then not Is_Child_Unit (Prev)
3814 Clause := First (Context_Items (N));
3815 while Present (Clause) loop
3816 if Nkind (Clause) = N_With_Clause
3817 and then Entity (Name (Clause)) = Prev
3820 ("child unit& hides compilation unit " &
3821 "with the same name?",
3831 -- The With_Clause may be on a grand-child or one of its further
3832 -- descendants, which makes a child immediately visible. Examine
3833 -- ancestry to determine whether such a child exists. For example,
3834 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
3835 -- is immediately visible.
3837 elsif Is_Child_Unit (Id) then
3843 while Is_Child_Unit (Par) loop
3844 if Is_Ancestor_Package (Scope (Par), U_Name) then
3845 Set_Is_Immediately_Visible (Par);
3854 -- If the item is a private with-clause on a child unit, the parent
3855 -- may have been installed already, but the child unit must remain
3856 -- invisible until installed in a private part or body.
3858 elsif Private_Present (Item) then
3859 Id := Entity (Name (Item));
3861 if Is_Child_Unit (Id) then
3862 Set_Is_Visible_Child_Unit (Id, False);
3868 end Install_Siblings;
3870 ---------------------------------
3871 -- Install_Limited_Withed_Unit --
3872 ---------------------------------
3874 procedure Install_Limited_Withed_Unit (N : Node_Id) is
3875 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
3878 Is_Child_Package : Boolean := False;
3879 Lim_Header : Entity_Id;
3880 Lim_Typ : Entity_Id;
3882 procedure Check_Body_Required;
3883 -- A unit mentioned in a limited with_clause may not be mentioned in
3884 -- a regular with_clause, but must still be included in the current
3885 -- partition. We need to determine whether the unit needs a body, so
3886 -- that the binder can determine the name of the file to be compiled.
3887 -- Checking whether a unit needs a body can be done without semantic
3888 -- analysis, by examining the nature of the declarations in the package.
3890 function Has_Limited_With_Clause
3891 (C_Unit : Entity_Id;
3892 Pack : Entity_Id) return Boolean;
3893 -- Determine whether any package in the ancestor chain starting with
3894 -- C_Unit has a limited with clause for package Pack.
3896 function Has_With_Clause
3899 Is_Limited : Boolean := False) return Boolean;
3900 -- Determine whether compilation unit C_Unit contains a with clause
3901 -- for package Pack. Use flag Is_Limited to designate desired clause
3902 -- kind. This is a subsidiary routine to Has_Limited_With_Clause.
3904 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
3905 -- Check if some package installed though normal with-clauses has a
3906 -- renaming declaration of package P. AARM 10.1.2(21/2).
3908 -------------------------
3909 -- Check_Body_Required --
3910 -------------------------
3912 -- ??? misses pragma Import on subprograms
3913 -- ??? misses pragma Import on renamed subprograms
3915 procedure Check_Body_Required is
3916 PA : constant List_Id :=
3917 Pragmas_After (Aux_Decls_Node (Parent (P_Unit)));
3919 procedure Check_Declarations (Spec : Node_Id);
3920 -- Recursive procedure that does the work and checks nested packages
3922 ------------------------
3923 -- Check_Declarations --
3924 ------------------------
3926 procedure Check_Declarations (Spec : Node_Id) is
3928 Incomplete_Decls : constant Elist_Id := New_Elmt_List;
3931 -- Search for Elaborate Body pragma
3933 Decl := First (Visible_Declarations (Spec));
3934 while Present (Decl)
3935 and then Nkind (Decl) = N_Pragma
3937 if Get_Pragma_Id (Decl) = Pragma_Elaborate_Body then
3938 Set_Body_Required (Library_Unit (N));
3945 -- Look for declarations that require the presence of a body
3947 while Present (Decl) loop
3949 -- Subprogram that comes from source means body required
3950 -- This is where a test for Import is missing ???
3952 if Comes_From_Source (Decl)
3953 and then (Nkind_In (Decl, N_Subprogram_Declaration,
3954 N_Generic_Subprogram_Declaration))
3956 Set_Body_Required (Library_Unit (N));
3959 -- Package declaration of generic package declaration. We need
3960 -- to recursively examine nested declarations.
3962 elsif Nkind_In (Decl, N_Package_Declaration,
3963 N_Generic_Package_Declaration)
3965 Check_Declarations (Specification (Decl));
3971 -- Same set of tests for private part. In addition to subprograms
3972 -- detect the presence of Taft Amendment types (incomplete types
3973 -- completed in the body).
3975 Decl := First (Private_Declarations (Spec));
3976 while Present (Decl) loop
3977 if Comes_From_Source (Decl)
3978 and then (Nkind_In (Decl, N_Subprogram_Declaration,
3979 N_Generic_Subprogram_Declaration))
3981 Set_Body_Required (Library_Unit (N));
3983 elsif Nkind_In (Decl, N_Package_Declaration,
3984 N_Generic_Package_Declaration)
3986 Check_Declarations (Specification (Decl));
3988 -- Collect incomplete type declarations for separate pass
3990 elsif Nkind (Decl) = N_Incomplete_Type_Declaration then
3991 Append_Elmt (Decl, Incomplete_Decls);
3997 -- Now check incomplete declarations to locate Taft amendment
3998 -- types. This can be done by examining the defining identifiers
3999 -- of type declarations without real semantic analysis.
4005 Inc := First_Elmt (Incomplete_Decls);
4006 while Present (Inc) loop
4007 Decl := Next (Node (Inc));
4008 while Present (Decl) loop
4009 if Nkind (Decl) = N_Full_Type_Declaration
4010 and then Chars (Defining_Identifier (Decl)) =
4011 Chars (Defining_Identifier (Node (Inc)))
4019 -- If no completion, this is a TAT, and a body is needed
4022 Set_Body_Required (Library_Unit (N));
4029 end Check_Declarations;
4031 -- Start of processing for Check_Body_Required
4034 -- If this is an imported package (Java and CIL usage) no body is
4035 -- needed. Scan list of pragmas that may follow a compilation unit
4036 -- to look for a relevant pragma Import.
4038 if Present (PA) then
4044 while Present (Prag) loop
4045 if Nkind (Prag) = N_Pragma
4046 and then Get_Pragma_Id (Prag) = Pragma_Import
4056 Check_Declarations (Specification (P_Unit));
4057 end Check_Body_Required;
4059 -----------------------------
4060 -- Has_Limited_With_Clause --
4061 -----------------------------
4063 function Has_Limited_With_Clause
4064 (C_Unit : Entity_Id;
4065 Pack : Entity_Id) return Boolean
4072 while Present (Par) loop
4073 if Ekind (Par) /= E_Package then
4077 -- Retrieve the Compilation_Unit node for Par and determine if
4078 -- its context clauses contain a limited with for Pack.
4080 Par_Unit := Parent (Parent (Parent (Par)));
4082 if Nkind (Par_Unit) = N_Package_Declaration then
4083 Par_Unit := Parent (Par_Unit);
4086 if Has_With_Clause (Par_Unit, Pack, True) then
4090 -- If there are more ancestors, climb up the tree, otherwise
4093 if Is_Child_Unit (Par) then
4101 end Has_Limited_With_Clause;
4103 ---------------------
4104 -- Has_With_Clause --
4105 ---------------------
4107 function Has_With_Clause
4110 Is_Limited : Boolean := False) return Boolean
4116 if Present (Context_Items (C_Unit)) then
4117 Item := First (Context_Items (C_Unit));
4118 while Present (Item) loop
4119 if Nkind (Item) = N_With_Clause then
4121 -- Retrieve the entity of the imported compilation unit
4123 if Nkind (Name (Item)) = N_Selected_Component then
4124 Nam := Entity (Selector_Name (Name (Item)));
4126 Nam := Entity (Name (Item));
4131 ((Is_Limited and then Limited_Present (Item))
4133 (not Is_Limited and then not Limited_Present (Item)))
4144 end Has_With_Clause;
4146 ----------------------------------
4147 -- Is_Visible_Through_Renamings --
4148 ----------------------------------
4150 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4151 Kind : constant Node_Kind :=
4152 Nkind (Unit (Cunit (Current_Sem_Unit)));
4158 -- Example of the error detected by this subprogram:
4166 -- package Ren_P renames P;
4172 -- limited with P; -- ERROR
4173 -- package R.C is ...
4175 Aux_Unit := Cunit (Current_Sem_Unit);
4178 Item := First (Context_Items (Aux_Unit));
4179 while Present (Item) loop
4180 if Nkind (Item) = N_With_Clause
4181 and then not Limited_Present (Item)
4182 and then Nkind (Unit (Library_Unit (Item))) =
4183 N_Package_Declaration
4186 First (Visible_Declarations
4187 (Specification (Unit (Library_Unit (Item)))));
4188 while Present (Decl) loop
4189 if Nkind (Decl) = N_Package_Renaming_Declaration
4190 and then Entity (Name (Decl)) = P
4192 -- Generate the error message only if the current unit
4193 -- is a package declaration; in case of subprogram
4194 -- bodies and package bodies we just return true to
4195 -- indicate that the limited view must not be
4198 if Kind = N_Package_Declaration then
4200 ("simultaneous visibility of the limited and " &
4201 "unlimited views not allowed", N);
4202 Error_Msg_Sloc := Sloc (Item);
4204 ("\\ unlimited view of & visible through the " &
4205 "context clause #", N, P);
4206 Error_Msg_Sloc := Sloc (Decl);
4207 Error_Msg_NE ("\\ and the renaming #", N, P);
4220 if Present (Library_Unit (Aux_Unit)) then
4221 if Aux_Unit = Library_Unit (Aux_Unit) then
4223 -- Aux_Unit is a body that acts as a spec. Clause has
4224 -- already been flagged as illegal.
4229 Aux_Unit := Library_Unit (Aux_Unit);
4232 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4235 exit when No (Aux_Unit);
4239 end Is_Visible_Through_Renamings;
4241 -- Start of processing for Install_Limited_Withed_Unit
4244 pragma Assert (not Limited_View_Installed (N));
4246 -- In case of limited with_clause on subprograms, generics, instances,
4247 -- or renamings, the corresponding error was previously posted and we
4248 -- have nothing to do here. If the file is missing altogether, it has
4249 -- no source location.
4251 if Nkind (P_Unit) /= N_Package_Declaration
4252 or else Sloc (P_Unit) = No_Location
4257 P := Defining_Unit_Name (Specification (P_Unit));
4259 -- Handle child packages
4261 if Nkind (P) = N_Defining_Program_Unit_Name then
4262 Is_Child_Package := True;
4263 P := Defining_Identifier (P);
4266 -- Do not install the limited-view if the full-view is already visible
4267 -- through renaming declarations.
4269 if Is_Visible_Through_Renamings (P) then
4273 -- Do not install the limited view if this is the unit being analyzed.
4274 -- This unusual case will happen when a unit has a limited_with clause
4275 -- on one of its children. The compilation of the child forces the
4276 -- load of the parent which tries to install the limited view of the
4277 -- child again. Installing the limited view must also be disabled
4278 -- when compiling the body of the child unit.
4280 if P = Cunit_Entity (Current_Sem_Unit)
4282 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4283 and then P = Main_Unit_Entity)
4288 -- This scenario is similar to the one above, the difference is that
4289 -- the compilation of sibling Par.Sib forces the load of parent Par
4290 -- which tries to install the limited view of Lim_Pack [1]. However
4291 -- Par.Sib has a with clause for Lim_Pack [2] in its body, and thus
4292 -- needs the non-limited views of all entities from Lim_Pack.
4294 -- limited with Lim_Pack; -- [1]
4295 -- package Par is ... package Lim_Pack is ...
4297 -- with Lim_Pack; -- [2]
4298 -- package Par.Sib is ... package body Par.Sib is ...
4300 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4301 -- Sem_Unit is the body of Par.Sib.
4303 if Ekind (P) = E_Package
4304 and then Ekind (Main_Unit_Entity) = E_Package
4305 and then Is_Child_Unit (Main_Unit_Entity)
4307 -- The body has a regular with clause
4309 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4310 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4312 -- One of the ancestors has a limited with clause
4314 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4315 N_Package_Specification
4316 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4321 -- A common use of the limited-with is to have a limited-with
4322 -- in the package spec, and a normal with in its package body.
4325 -- limited with X; -- [1]
4329 -- package body A is ...
4331 -- The compilation of A's body installs the context clauses found at [2]
4332 -- and then the context clauses of its specification (found at [1]). As
4333 -- a consequence, at [1] the specification of X has been analyzed and it
4334 -- is immediately visible. According to the semantics of limited-with
4335 -- context clauses we don't install the limited view because the full
4336 -- view of X supersedes its limited view.
4338 if Analyzed (P_Unit)
4340 (Is_Immediately_Visible (P)
4342 (Is_Child_Package and then Is_Visible_Child_Unit (P)))
4347 if Debug_Flag_I then
4348 Write_Str ("install limited view of ");
4349 Write_Name (Chars (P));
4353 -- If the unit has not been analyzed and the limited view has not been
4354 -- already installed then we install it.
4356 if not Analyzed (P_Unit) then
4357 if not In_Chain (P) then
4359 -- Minimum decoration
4361 Set_Ekind (P, E_Package);
4362 Set_Etype (P, Standard_Void_Type);
4363 Set_Scope (P, Standard_Standard);
4365 if Is_Child_Package then
4366 Set_Is_Child_Unit (P);
4367 Set_Is_Visible_Child_Unit (P);
4368 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4371 -- Place entity on visibility structure
4373 Set_Homonym (P, Current_Entity (P));
4374 Set_Current_Entity (P);
4376 if Debug_Flag_I then
4377 Write_Str (" (homonym) chain ");
4378 Write_Name (Chars (P));
4382 -- Install the incomplete view. The first element of the limited
4383 -- view is a header (an E_Package entity) used to reference the
4384 -- first shadow entity in the private part of the package.
4386 Lim_Header := Limited_View (P);
4387 Lim_Typ := First_Entity (Lim_Header);
4389 while Present (Lim_Typ)
4390 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4392 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4393 Set_Current_Entity (Lim_Typ);
4395 if Debug_Flag_I then
4396 Write_Str (" (homonym) chain ");
4397 Write_Name (Chars (Lim_Typ));
4401 Next_Entity (Lim_Typ);
4405 -- If the unit appears in a previous regular with_clause, the regular
4406 -- entities of the public part of the withed package must be replaced
4407 -- by the shadow ones.
4409 -- This code must be kept synchronized with the code that replaces the
4410 -- shadow entities by the real entities (see body of Remove_Limited
4411 -- With_Clause); otherwise the contents of the homonym chains are not
4415 -- Hide all the type entities of the public part of the package to
4416 -- avoid its usage. This is needed to cover all the subtype decla-
4417 -- rations because we do not remove them from the homonym chain.
4419 E := First_Entity (P);
4420 while Present (E) and then E /= First_Private_Entity (P) loop
4422 Set_Was_Hidden (E, Is_Hidden (E));
4429 -- Replace the real entities by the shadow entities of the limited
4430 -- view. The first element of the limited view is a header that is
4431 -- used to reference the first shadow entity in the private part
4432 -- of the package. Successive elements are the limited views of the
4433 -- type (including regular incomplete types) declared in the package.
4435 Lim_Header := Limited_View (P);
4437 Lim_Typ := First_Entity (Lim_Header);
4438 while Present (Lim_Typ)
4439 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4441 pragma Assert (not In_Chain (Lim_Typ));
4443 -- Do not unchain nested packages and child units
4445 if Ekind (Lim_Typ) /= E_Package
4446 and then not Is_Child_Unit (Lim_Typ)
4452 Prev := Current_Entity (Lim_Typ);
4455 -- Replace E in the homonyms list, so that the limited
4456 -- view becomes available.
4458 if E = Non_Limited_View (Lim_Typ) then
4459 Set_Homonym (Lim_Typ, Homonym (Prev));
4460 Set_Current_Entity (Lim_Typ);
4464 E := Homonym (Prev);
4466 -- E may have been removed when installing a
4467 -- previous limited_with_clause.
4471 exit when E = Non_Limited_View (Lim_Typ);
4473 Prev := Homonym (Prev);
4477 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4478 Set_Homonym (Prev, Lim_Typ);
4483 if Debug_Flag_I then
4484 Write_Str (" (homonym) chain ");
4485 Write_Name (Chars (Lim_Typ));
4490 Next_Entity (Lim_Typ);
4494 -- The package must be visible while the limited-with clause is active
4495 -- because references to the type P.T must resolve in the usual way.
4496 -- In addition, we remember that the limited-view has been installed to
4497 -- uninstall it at the point of context removal.
4499 Set_Is_Immediately_Visible (P);
4500 Set_Limited_View_Installed (N);
4502 -- If unit has not been analyzed in some previous context, check
4503 -- (imperfectly ???) whether it might need a body.
4505 if not Analyzed (P_Unit) then
4506 Check_Body_Required;
4509 -- If the package in the limited_with clause is a child unit, the
4510 -- clause is unanalyzed and appears as a selected component. Recast
4511 -- it as an expanded name so that the entity can be properly set. Use
4512 -- entity of parent, if available, for higher ancestors in the name.
4514 if Nkind (Name (N)) = N_Selected_Component then
4522 while Nkind (Nam) = N_Selected_Component
4523 and then Present (Ent)
4525 Change_Selected_Component_To_Expanded_Name (Nam);
4527 -- Set entity of parent identifiers if the unit is a child
4528 -- unit. This ensures that the tree is properly formed from
4529 -- semantic point of view (e.g. for ASIS queries).
4531 Set_Entity (Nam, Ent);
4533 Nam := Prefix (Nam);
4536 -- Set entity of last ancestor
4538 if Nkind (Nam) = N_Identifier then
4539 Set_Entity (Nam, Ent);
4545 Set_Entity (Name (N), P);
4546 Set_From_With_Type (P);
4547 end Install_Limited_Withed_Unit;
4549 -------------------------
4550 -- Install_Withed_Unit --
4551 -------------------------
4553 procedure Install_Withed_Unit
4554 (With_Clause : Node_Id;
4555 Private_With_OK : Boolean := False)
4557 Uname : constant Entity_Id := Entity (Name (With_Clause));
4558 P : constant Entity_Id := Scope (Uname);
4561 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4562 -- compiling a package declaration and the Private_With_OK flag was not
4563 -- set by the caller. These declarations will be installed later (before
4564 -- analyzing the private part of the package).
4566 if Private_Present (With_Clause)
4567 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
4568 and then not (Private_With_OK)
4573 if Debug_Flag_I then
4574 if Private_Present (With_Clause) then
4575 Write_Str ("install private withed unit ");
4577 Write_Str ("install withed unit ");
4580 Write_Name (Chars (Uname));
4584 -- We do not apply the restrictions to an internal unit unless
4585 -- we are compiling the internal unit as a main unit. This check
4586 -- is also skipped for dummy units (for missing packages).
4588 if Sloc (Uname) /= No_Location
4589 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
4590 or else Current_Sem_Unit = Main_Unit)
4592 Check_Restricted_Unit
4593 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
4596 if P /= Standard_Standard then
4598 -- If the unit is not analyzed after analysis of the with clause and
4599 -- it is an instantiation then it awaits a body and is the main unit.
4600 -- Its appearance in the context of some other unit indicates a
4601 -- circular dependency (DEC suite perversity).
4603 if not Analyzed (Uname)
4604 and then Nkind (Parent (Uname)) = N_Package_Instantiation
4607 ("instantiation depends on itself", Name (With_Clause));
4609 elsif not Is_Visible_Child_Unit (Uname) then
4610 Set_Is_Visible_Child_Unit (Uname);
4612 -- If the child unit appears in the context of its parent, it is
4613 -- immediately visible.
4615 if In_Open_Scopes (Scope (Uname)) then
4616 Set_Is_Immediately_Visible (Uname);
4619 if Is_Generic_Instance (Uname)
4620 and then Ekind (Uname) in Subprogram_Kind
4622 -- Set flag as well on the visible entity that denotes the
4623 -- instance, which renames the current one.
4625 Set_Is_Visible_Child_Unit
4627 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
4630 -- The parent unit may have been installed already, and may have
4631 -- appeared in a use clause.
4633 if In_Use (Scope (Uname)) then
4634 Set_Is_Potentially_Use_Visible (Uname);
4637 Set_Context_Installed (With_Clause);
4640 elsif not Is_Immediately_Visible (Uname) then
4641 if not Private_Present (With_Clause)
4642 or else Private_With_OK
4644 Set_Is_Immediately_Visible (Uname);
4647 Set_Context_Installed (With_Clause);
4650 -- A with-clause overrides a with-type clause: there are no restric-
4651 -- tions on the use of package entities.
4653 if Ekind (Uname) = E_Package then
4654 Set_From_With_Type (Uname, False);
4657 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4658 -- unit if there is a visible homograph for it declared in the same
4659 -- declarative region. This pathological case can only arise when an
4660 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4661 -- G1 has a generic child also named G2, and the context includes with_
4662 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4663 -- of I1.G2 visible as well. If the child unit is named Standard, do
4664 -- not apply the check to the Standard package itself.
4666 if Is_Child_Unit (Uname)
4667 and then Is_Visible_Child_Unit (Uname)
4668 and then Ada_Version >= Ada_05
4671 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
4677 U2 := Homonym (Uname);
4679 and then U2 /= Standard_Standard
4682 Decl2 := Unit_Declaration_Node (P2);
4684 if Is_Child_Unit (U2)
4685 and then Is_Visible_Child_Unit (U2)
4687 if Is_Generic_Instance (P)
4688 and then Nkind (Decl1) = N_Package_Declaration
4689 and then Generic_Parent (Specification (Decl1)) = P2
4691 Error_Msg_N ("illegal with_clause", With_Clause);
4693 ("\child unit has visible homograph" &
4694 " (RM 8.3(26), 10.1.1(19))",
4698 elsif Is_Generic_Instance (P2)
4699 and then Nkind (Decl2) = N_Package_Declaration
4700 and then Generic_Parent (Specification (Decl2)) = P
4702 -- With_clause for child unit of instance appears before
4703 -- in the context. We want to place the error message on
4704 -- it, not on the generic child unit itself.
4707 Prev_Clause : Node_Id;
4710 Prev_Clause := First (List_Containing (With_Clause));
4711 while Entity (Name (Prev_Clause)) /= U2 loop
4715 pragma Assert (Present (Prev_Clause));
4716 Error_Msg_N ("illegal with_clause", Prev_Clause);
4718 ("\child unit has visible homograph" &
4719 " (RM 8.3(26), 10.1.1(19))",
4730 end Install_Withed_Unit;
4736 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
4737 K : constant Node_Kind := Nkind (Lib_Unit);
4740 return (K in N_Generic_Declaration or else
4741 K in N_Generic_Instantiation or else
4742 K in N_Generic_Renaming_Declaration or else
4743 K = N_Package_Declaration or else
4744 K = N_Package_Renaming_Declaration or else
4745 K = N_Subprogram_Declaration or else
4746 K = N_Subprogram_Renaming_Declaration)
4747 and then Present (Parent_Spec (Lib_Unit));
4750 -----------------------
4751 -- Load_Needed_Body --
4752 -----------------------
4754 -- N is a generic unit named in a with clause, or else it is a unit that
4755 -- contains a generic unit or an inlined function. In order to perform an
4756 -- instantiation, the body of the unit must be present. If the unit itself
4757 -- is generic, we assume that an instantiation follows, and load & analyze
4758 -- the body unconditionally. This forces analysis of the spec as well.
4760 -- If the unit is not generic, but contains a generic unit, it is loaded on
4761 -- demand, at the point of instantiation (see ch12).
4763 procedure Load_Needed_Body (N : Node_Id; OK : out Boolean) is
4764 Body_Name : Unit_Name_Type;
4765 Unum : Unit_Number_Type;
4767 Save_Style_Check : constant Boolean := Opt.Style_Check;
4768 -- The loading and analysis is done with style checks off
4771 if not GNAT_Mode then
4772 Style_Check := False;
4775 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
4778 (Load_Name => Body_Name,
4784 if Unum = No_Unit then
4788 Compiler_State := Analyzing; -- reset after load
4790 if not Fatal_Error (Unum) or else Try_Semantics then
4791 if Debug_Flag_L then
4792 Write_Str ("*** Loaded generic body");
4796 Semantics (Cunit (Unum));
4802 Style_Check := Save_Style_Check;
4803 end Load_Needed_Body;
4805 -------------------------
4806 -- Build_Limited_Views --
4807 -------------------------
4809 procedure Build_Limited_Views (N : Node_Id) is
4810 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
4811 P : constant Entity_Id := Cunit_Entity (Unum);
4813 Spec : Node_Id; -- To denote a package specification
4814 Lim_Typ : Entity_Id; -- To denote shadow entities
4815 Comp_Typ : Entity_Id; -- To denote real entities
4817 Lim_Header : Entity_Id; -- Package entity
4818 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
4819 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
4821 procedure Decorate_Incomplete_Type
4824 -- Add attributes of an incomplete type to a shadow entity. The same
4825 -- attributes are placed on the real entity, so that gigi receives
4826 -- a consistent view.
4828 procedure Decorate_Package_Specification (P : Entity_Id);
4829 -- Add attributes of a package entity to the entity in a package
4832 procedure Decorate_Tagged_Type
4836 -- Set basic attributes of tagged type T, including its class_wide type.
4837 -- The parameters Loc, Scope are used to decorate the class_wide type.
4839 procedure Build_Chain
4841 First_Decl : Node_Id);
4842 -- Construct list of shadow entities and attach it to entity of
4843 -- package that is mentioned in a limited_with clause.
4845 function New_Internal_Shadow_Entity
4846 (Kind : Entity_Kind;
4847 Sloc_Value : Source_Ptr;
4848 Id_Char : Character) return Entity_Id;
4849 -- Build a new internal entity and append it to the list of shadow
4850 -- entities available through the limited-header
4852 ------------------------------
4853 -- Decorate_Incomplete_Type --
4854 ------------------------------
4856 procedure Decorate_Incomplete_Type
4861 Set_Ekind (E, E_Incomplete_Type);
4862 Set_Scope (E, Scop);
4864 Set_Is_First_Subtype (E, True);
4865 Set_Stored_Constraint (E, No_Elist);
4866 Set_Full_View (E, Empty);
4867 Init_Size_Align (E);
4868 end Decorate_Incomplete_Type;
4870 --------------------------
4871 -- Decorate_Tagged_Type --
4872 --------------------------
4874 procedure Decorate_Tagged_Type
4882 Decorate_Incomplete_Type (T, Scop);
4883 Set_Is_Tagged_Type (T);
4885 -- Build corresponding class_wide type, if not previously done
4887 -- Note: The class-wide entity is shared by the limited-view
4888 -- and the full-view.
4890 if No (Class_Wide_Type (T)) then
4891 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S'));
4893 -- Set parent to be the same as the parent of the tagged type.
4894 -- We need a parent field set, and it is supposed to point to
4895 -- the declaration of the type. The tagged type declaration
4896 -- essentially declares two separate types, the tagged type
4897 -- itself and the corresponding class-wide type, so it is
4898 -- reasonable for the parent fields to point to the declaration
4901 Set_Parent (CW, Parent (T));
4903 -- Set remaining fields of classwide type
4905 Set_Ekind (CW, E_Class_Wide_Type);
4907 Set_Scope (CW, Scop);
4908 Set_Is_Tagged_Type (CW);
4909 Set_Is_First_Subtype (CW, True);
4910 Init_Size_Align (CW);
4911 Set_Has_Unknown_Discriminants (CW, True);
4912 Set_Class_Wide_Type (CW, CW);
4913 Set_Equivalent_Type (CW, Empty);
4914 Set_From_With_Type (CW, From_With_Type (T));
4916 -- Link type to its class-wide type
4918 Set_Class_Wide_Type (T, CW);
4920 end Decorate_Tagged_Type;
4922 ------------------------------------
4923 -- Decorate_Package_Specification --
4924 ------------------------------------
4926 procedure Decorate_Package_Specification (P : Entity_Id) is
4928 -- Place only the most basic attributes
4930 Set_Ekind (P, E_Package);
4931 Set_Etype (P, Standard_Void_Type);
4932 end Decorate_Package_Specification;
4934 --------------------------------
4935 -- New_Internal_Shadow_Entity --
4936 --------------------------------
4938 function New_Internal_Shadow_Entity
4939 (Kind : Entity_Kind;
4940 Sloc_Value : Source_Ptr;
4941 Id_Char : Character) return Entity_Id
4943 E : constant Entity_Id :=
4944 Make_Defining_Identifier (Sloc_Value,
4945 Chars => New_Internal_Name (Id_Char));
4948 Set_Ekind (E, Kind);
4949 Set_Is_Internal (E, True);
4951 if Kind in Type_Kind then
4952 Init_Size_Align (E);
4955 Append_Entity (E, Lim_Header);
4958 end New_Internal_Shadow_Entity;
4964 procedure Build_Chain
4966 First_Decl : Node_Id)
4968 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
4969 Is_Tagged : Boolean;
4974 while Present (Decl) loop
4976 -- For each library_package_declaration in the environment, there
4977 -- is an implicit declaration of a *limited view* of that library
4978 -- package. The limited view of a package contains:
4980 -- * For each nested package_declaration, a declaration of the
4981 -- limited view of that package, with the same defining-
4982 -- program-unit name.
4984 -- * For each type_declaration in the visible part, an incomplete
4985 -- type-declaration with the same defining_identifier, whose
4986 -- completion is the type_declaration. If the type_declaration
4987 -- is tagged, then the incomplete_type_declaration is tagged
4990 -- The partial view is tagged if the declaration has the
4991 -- explicit keyword, or else if it is a type extension, both
4992 -- of which can be ascertained syntactically.
4994 if Nkind (Decl) = N_Full_Type_Declaration then
4996 (Nkind (Type_Definition (Decl)) = N_Record_Definition
4997 and then Tagged_Present (Type_Definition (Decl)))
4999 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
5002 (Record_Extension_Part (Type_Definition (Decl))));
5004 Comp_Typ := Defining_Identifier (Decl);
5006 if not Analyzed_Unit then
5008 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5010 Decorate_Incomplete_Type (Comp_Typ, Scope);
5014 -- Create shadow entity for type
5016 Lim_Typ := New_Internal_Shadow_Entity
5017 (Kind => Ekind (Comp_Typ),
5018 Sloc_Value => Sloc (Comp_Typ),
5021 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5022 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5023 Set_From_With_Type (Lim_Typ);
5026 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5028 Decorate_Incomplete_Type (Lim_Typ, Scope);
5031 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5033 elsif Nkind_In (Decl, N_Private_Type_Declaration,
5034 N_Incomplete_Type_Declaration,
5035 N_Task_Type_Declaration,
5036 N_Protected_Type_Declaration)
5038 Comp_Typ := Defining_Identifier (Decl);
5041 Nkind_In (Decl, N_Private_Type_Declaration,
5042 N_Incomplete_Type_Declaration)
5043 and then Tagged_Present (Decl);
5045 if not Analyzed_Unit then
5047 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5049 Decorate_Incomplete_Type (Comp_Typ, Scope);
5053 Lim_Typ := New_Internal_Shadow_Entity
5054 (Kind => Ekind (Comp_Typ),
5055 Sloc_Value => Sloc (Comp_Typ),
5058 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5059 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5060 Set_From_With_Type (Lim_Typ);
5063 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5065 Decorate_Incomplete_Type (Lim_Typ, Scope);
5068 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5070 elsif Nkind (Decl) = N_Private_Extension_Declaration then
5071 Comp_Typ := Defining_Identifier (Decl);
5073 if not Analyzed_Unit then
5074 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5077 -- Create shadow entity for type
5079 Lim_Typ := New_Internal_Shadow_Entity
5080 (Kind => Ekind (Comp_Typ),
5081 Sloc_Value => Sloc (Comp_Typ),
5084 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5085 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5086 Set_From_With_Type (Lim_Typ);
5088 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5089 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5091 elsif Nkind (Decl) = N_Package_Declaration then
5096 Spec : constant Node_Id := Specification (Decl);
5099 Comp_Typ := Defining_Unit_Name (Spec);
5101 if not Analyzed (Cunit (Unum)) then
5102 Decorate_Package_Specification (Comp_Typ);
5103 Set_Scope (Comp_Typ, Scope);
5106 Lim_Typ := New_Internal_Shadow_Entity
5107 (Kind => Ekind (Comp_Typ),
5108 Sloc_Value => Sloc (Comp_Typ),
5111 Decorate_Package_Specification (Lim_Typ);
5112 Set_Scope (Lim_Typ, Scope);
5114 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5115 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5116 Set_From_With_Type (Lim_Typ);
5118 -- Note: The non_limited_view attribute is not used
5119 -- for local packages.
5123 First_Decl => First (Visible_Declarations (Spec)));
5131 -- Start of processing for Build_Limited_Views
5134 pragma Assert (Limited_Present (N));
5136 -- A library_item mentioned in a limited_with_clause is a package
5137 -- declaration, not a subprogram declaration, generic declaration,
5138 -- generic instantiation, or package renaming declaration.
5140 case Nkind (Unit (Library_Unit (N))) is
5141 when N_Package_Declaration =>
5144 when N_Subprogram_Declaration =>
5145 Error_Msg_N ("subprograms not allowed in "
5146 & "limited with_clauses", N);
5149 when N_Generic_Package_Declaration |
5150 N_Generic_Subprogram_Declaration =>
5151 Error_Msg_N ("generics not allowed in "
5152 & "limited with_clauses", N);
5155 when N_Generic_Instantiation =>
5156 Error_Msg_N ("generic instantiations not allowed in "
5157 & "limited with_clauses", N);
5160 when N_Generic_Renaming_Declaration =>
5161 Error_Msg_N ("generic renamings not allowed in "
5162 & "limited with_clauses", N);
5165 when N_Subprogram_Renaming_Declaration =>
5166 Error_Msg_N ("renamed subprograms not allowed in "
5167 & "limited with_clauses", N);
5170 when N_Package_Renaming_Declaration =>
5171 Error_Msg_N ("renamed packages not allowed in "
5172 & "limited with_clauses", N);
5176 raise Program_Error;
5179 -- Check if the chain is already built
5181 Spec := Specification (Unit (Library_Unit (N)));
5183 if Limited_View_Installed (Spec) then
5187 Set_Ekind (P, E_Package);
5189 -- Build the header of the limited_view
5192 Make_Defining_Identifier (Sloc (N),
5193 Chars => New_Internal_Name (Id_Char => 'Z'));
5194 Set_Ekind (Lim_Header, E_Package);
5195 Set_Is_Internal (Lim_Header);
5196 Set_Limited_View (P, Lim_Header);
5198 -- Create the auxiliary chain. All the shadow entities are appended to
5199 -- the list of entities of the limited-view header
5203 First_Decl => First (Visible_Declarations (Spec)));
5205 -- Save the last built shadow entity. It is needed later to set the
5206 -- reference to the first shadow entity in the private part
5208 Last_Pub_Lim_E := Last_Lim_E;
5210 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5211 -- Required to give support to limited-private-with clauses
5213 Build_Chain (Scope => P,
5214 First_Decl => First (Private_Declarations (Spec)));
5216 if Last_Pub_Lim_E /= Empty then
5217 Set_First_Private_Entity (Lim_Header,
5218 Next_Entity (Last_Pub_Lim_E));
5220 Set_First_Private_Entity (Lim_Header,
5224 Set_Limited_View_Installed (Spec);
5225 end Build_Limited_Views;
5227 -------------------------------
5228 -- Check_Body_Needed_For_SAL --
5229 -------------------------------
5231 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5233 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5234 -- Determine whether use of entity E might require the presence of its
5235 -- body. For a package this requires a recursive traversal of all nested
5238 ---------------------------
5239 -- Entity_Needed_For_SAL --
5240 ---------------------------
5242 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5246 if Is_Subprogram (E)
5247 and then Has_Pragma_Inline (E)
5251 elsif Ekind (E) = E_Generic_Function
5252 or else Ekind (E) = E_Generic_Procedure
5256 elsif Ekind (E) = E_Generic_Package
5258 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5259 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5263 elsif Ekind (E) = E_Package
5265 Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5266 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5268 Ent := First_Entity (E);
5269 while Present (Ent) loop
5270 if Entity_Needs_Body (Ent) then
5282 end Entity_Needs_Body;
5284 -- Start of processing for Check_Body_Needed_For_SAL
5287 if Ekind (Unit_Name) = E_Generic_Package
5289 Nkind (Unit_Declaration_Node (Unit_Name)) =
5290 N_Generic_Package_Declaration
5292 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5294 Set_Body_Needed_For_SAL (Unit_Name);
5296 elsif Ekind (Unit_Name) = E_Generic_Procedure
5297 or else Ekind (Unit_Name) = E_Generic_Function
5299 Set_Body_Needed_For_SAL (Unit_Name);
5301 elsif Is_Subprogram (Unit_Name)
5302 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5303 N_Subprogram_Declaration
5304 and then Has_Pragma_Inline (Unit_Name)
5306 Set_Body_Needed_For_SAL (Unit_Name);
5308 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5309 Check_Body_Needed_For_SAL
5310 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5312 elsif Ekind (Unit_Name) = E_Package
5313 and then Entity_Needs_Body (Unit_Name)
5315 Set_Body_Needed_For_SAL (Unit_Name);
5317 elsif Ekind (Unit_Name) = E_Package_Body
5318 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5320 Check_Body_Needed_For_SAL
5321 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5323 end Check_Body_Needed_For_SAL;
5325 --------------------
5326 -- Remove_Context --
5327 --------------------
5329 procedure Remove_Context (N : Node_Id) is
5330 Lib_Unit : constant Node_Id := Unit (N);
5333 -- If this is a child unit, first remove the parent units
5335 if Is_Child_Spec (Lib_Unit) then
5336 Remove_Parents (Lib_Unit);
5339 Remove_Context_Clauses (N);
5342 ----------------------------
5343 -- Remove_Context_Clauses --
5344 ----------------------------
5346 procedure Remove_Context_Clauses (N : Node_Id) is
5348 Unit_Name : Entity_Id;
5351 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5352 -- limited-views first and regular-views later (to maintain the
5355 -- First Phase: Remove limited_with context clauses
5357 Item := First (Context_Items (N));
5358 while Present (Item) loop
5360 -- We are interested only in with clauses which got installed
5363 if Nkind (Item) = N_With_Clause
5364 and then Limited_Present (Item)
5365 and then Limited_View_Installed (Item)
5367 Remove_Limited_With_Clause (Item);
5373 -- Second Phase: Loop through context items and undo regular
5374 -- with_clauses and use_clauses.
5376 Item := First (Context_Items (N));
5377 while Present (Item) loop
5379 -- We are interested only in with clauses which got installed on
5380 -- entry, as indicated by their Context_Installed flag set
5382 if Nkind (Item) = N_With_Clause
5383 and then Limited_Present (Item)
5384 and then Limited_View_Installed (Item)
5388 elsif Nkind (Item) = N_With_Clause
5389 and then Context_Installed (Item)
5391 -- Remove items from one with'ed unit
5393 Unit_Name := Entity (Name (Item));
5394 Remove_Unit_From_Visibility (Unit_Name);
5395 Set_Context_Installed (Item, False);
5397 elsif Nkind (Item) = N_Use_Package_Clause then
5398 End_Use_Package (Item);
5400 elsif Nkind (Item) = N_Use_Type_Clause then
5401 End_Use_Type (Item);
5406 end Remove_Context_Clauses;
5408 --------------------------------
5409 -- Remove_Limited_With_Clause --
5410 --------------------------------
5412 procedure Remove_Limited_With_Clause (N : Node_Id) is
5413 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5416 Lim_Header : Entity_Id;
5417 Lim_Typ : Entity_Id;
5421 pragma Assert (Limited_View_Installed (N));
5423 -- In case of limited with_clause on subprograms, generics, instances,
5424 -- or renamings, the corresponding error was previously posted and we
5425 -- have nothing to do here.
5427 if Nkind (P_Unit) /= N_Package_Declaration then
5431 P := Defining_Unit_Name (Specification (P_Unit));
5433 -- Handle child packages
5435 if Nkind (P) = N_Defining_Program_Unit_Name then
5436 P := Defining_Identifier (P);
5439 if Debug_Flag_I then
5440 Write_Str ("remove limited view of ");
5441 Write_Name (Chars (P));
5442 Write_Str (" from visibility");
5446 -- Prepare the removal of the shadow entities from visibility. The
5447 -- first element of the limited view is a header (an E_Package
5448 -- entity) that is used to reference the first shadow entity in the
5449 -- private part of the package
5451 Lim_Header := Limited_View (P);
5452 Lim_Typ := First_Entity (Lim_Header);
5454 -- Remove package and shadow entities from visibility if it has not
5457 if not Analyzed (P_Unit) then
5459 Set_Is_Immediately_Visible (P, False);
5461 while Present (Lim_Typ) loop
5463 Next_Entity (Lim_Typ);
5466 -- Otherwise this package has already appeared in the closure and its
5467 -- shadow entities must be replaced by its real entities. This code
5468 -- must be kept synchronized with the complementary code in Install
5469 -- Limited_Withed_Unit.
5472 -- Real entities that are type or subtype declarations were hidden
5473 -- from visibility at the point of installation of the limited-view.
5474 -- Now we recover the previous value of the hidden attribute.
5476 E := First_Entity (P);
5477 while Present (E) and then E /= First_Private_Entity (P) loop
5479 Set_Is_Hidden (E, Was_Hidden (E));
5485 while Present (Lim_Typ)
5486 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5488 -- Nested packages and child units were not unchained
5490 if Ekind (Lim_Typ) /= E_Package
5491 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5493 -- Handle incomplete types of the real view. For this purpose
5494 -- we traverse the list of visible entities to look for an
5495 -- incomplete type in the real-view associated with Lim_Typ.
5497 E := First_Entity (P);
5498 while Present (E) and then E /= First_Private_Entity (P) loop
5499 exit when Ekind (E) = E_Incomplete_Type
5500 and then Present (Full_View (E))
5501 and then Full_View (E) = Lim_Typ;
5506 -- If the previous search was not successful then the entity
5507 -- to be restored in the homonym list is the non-limited view
5509 if E = First_Private_Entity (P) then
5510 E := Non_Limited_View (Lim_Typ);
5513 pragma Assert (not In_Chain (E));
5515 Prev := Current_Entity (Lim_Typ);
5517 if Prev = Lim_Typ then
5518 Set_Current_Entity (E);
5521 while Present (Prev)
5522 and then Homonym (Prev) /= Lim_Typ
5524 Prev := Homonym (Prev);
5527 if Present (Prev) then
5528 Set_Homonym (Prev, E);
5532 -- We must also set the next homonym entity of the real entity
5533 -- to handle the case in which the next homonym was a shadow
5536 Set_Homonym (E, Homonym (Lim_Typ));
5539 Next_Entity (Lim_Typ);
5543 -- Indicate that the limited view of the package is not installed
5545 Set_From_With_Type (P, False);
5546 Set_Limited_View_Installed (N, False);
5547 end Remove_Limited_With_Clause;
5549 --------------------
5550 -- Remove_Parents --
5551 --------------------
5553 procedure Remove_Parents (Lib_Unit : Node_Id) is
5556 P_Spec : Node_Id := Empty;
5558 Vis : constant Boolean :=
5559 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
5562 if Is_Child_Spec (Lib_Unit) then
5563 P_Spec := Parent_Spec (Lib_Unit);
5565 elsif Nkind (Lib_Unit) = N_Package_Body
5566 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
5568 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
5571 if Present (P_Spec) then
5574 P_Name := Get_Parent_Entity (P);
5575 Remove_Context_Clauses (P_Spec);
5576 End_Package_Scope (P_Name);
5577 Set_Is_Immediately_Visible (P_Name, Vis);
5579 -- Remove from visibility the siblings as well, which are directly
5580 -- visible while the parent is in scope.
5582 E := First_Entity (P_Name);
5583 while Present (E) loop
5584 if Is_Child_Unit (E) then
5585 Set_Is_Immediately_Visible (E, False);
5591 Set_In_Package_Body (P_Name, False);
5593 -- This is the recursive call to remove the context of any
5594 -- higher level parent. This recursion ensures that all parents
5595 -- are removed in the reverse order of their installation.
5601 ---------------------------------
5602 -- Remove_Private_With_Clauses --
5603 ---------------------------------
5605 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
5608 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
5609 -- Check whether a given unit appears in a regular with_clause.
5610 -- Used to determine whether a private_with_clause, implicit or
5611 -- explicit, should be ignored.
5613 ----------------------------
5614 -- In_Regular_With_Clause --
5615 ----------------------------
5617 function In_Regular_With_Clause (E : Entity_Id) return Boolean
5622 Item := First (Context_Items (Comp_Unit));
5623 while Present (Item) loop
5624 if Nkind (Item) = N_With_Clause
5625 and then Entity (Name (Item)) = E
5626 and then not Private_Present (Item)
5634 end In_Regular_With_Clause;
5636 -- Start of processing for Remove_Private_With_Clauses
5639 Item := First (Context_Items (Comp_Unit));
5640 while Present (Item) loop
5641 if Nkind (Item) = N_With_Clause
5642 and then Private_Present (Item)
5644 -- If private_with_clause is redundant, remove it from
5645 -- context, as a small optimization to subsequent handling
5646 -- of private_with clauses in other nested packages..
5648 if In_Regular_With_Clause (Entity (Name (Item))) then
5650 Nxt : constant Node_Id := Next (Item);
5656 elsif Limited_Present (Item) then
5657 if not Limited_View_Installed (Item) then
5658 Remove_Limited_With_Clause (Item);
5664 Remove_Unit_From_Visibility (Entity (Name (Item)));
5665 Set_Context_Installed (Item, False);
5673 end Remove_Private_With_Clauses;
5675 ---------------------------------
5676 -- Remove_Unit_From_Visibility --
5677 ---------------------------------
5679 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
5680 P : constant Entity_Id := Scope (Unit_Name);
5683 if Debug_Flag_I then
5684 Write_Str ("remove unit ");
5685 Write_Name (Chars (Unit_Name));
5686 Write_Str (" from visibility");
5690 if P /= Standard_Standard then
5691 Set_Is_Visible_Child_Unit (Unit_Name, False);
5694 Set_Is_Potentially_Use_Visible (Unit_Name, False);
5695 Set_Is_Immediately_Visible (Unit_Name, False);
5696 end Remove_Unit_From_Visibility;
5711 procedure Unchain (E : Entity_Id) is
5715 Prev := Current_Entity (E);
5721 Set_Name_Entity_Id (Chars (E), Homonym (E));
5724 while Present (Prev)
5725 and then Homonym (Prev) /= E
5727 Prev := Homonym (Prev);
5730 if Present (Prev) then
5731 Set_Homonym (Prev, Homonym (E));
5735 if Debug_Flag_I then
5736 Write_Str (" (homonym) unchain ");
5737 Write_Name (Chars (E));
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