1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Debug; use Debug;
28 with Einfo; use Einfo;
29 with Errout; use Errout;
30 with Exp_Util; use Exp_Util;
31 with Elists; use Elists;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
35 with Impunit; use Impunit;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Namet; use Namet;
41 with Nlists; use Nlists;
42 with Nmake; use Nmake;
44 with Output; use Output;
45 with 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 this is a child unit, generate references to the parents
779 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
780 N_Defining_Program_Unit_Name
782 Generate_Parent_References (
783 Specification (Unit_Node),
784 Scope (Defining_Entity (Unit (Lib_Unit))));
788 -- If it is a child unit, the parent must be elaborated first and we
789 -- update version, since we are dependent on our parent.
791 if Is_Child_Spec (Unit_Node) then
793 -- The analysis of the parent is done with style checks off
796 Save_Style_Check : constant Boolean := Style_Check;
797 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
798 Cunit_Boolean_Restrictions_Save;
801 if not GNAT_Mode then
802 Style_Check := False;
805 Semantics (Parent_Spec (Unit_Node));
806 Version_Update (N, Parent_Spec (Unit_Node));
807 Style_Check := Save_Style_Check;
808 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
812 -- With the analysis done, install the context. Note that we can't
813 -- install the context from the with clauses as we analyze them, because
814 -- each with clause must be analyzed in a clean visibility context, so
815 -- we have to wait and install them all at once.
819 if Is_Child_Spec (Unit_Node) then
821 -- Set the entities of all parents in the program_unit_name
823 Generate_Parent_References (
824 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
827 -- All components of the context: with-clauses, library unit, ancestors
828 -- if any, (and their context) are analyzed and installed.
830 -- Call special debug routine sm if this is the main unit
832 if Current_Sem_Unit = Main_Unit then
836 -- Now analyze the unit (package, subprogram spec, body) itself
840 if Warn_On_Redundant_Constructs then
841 Check_Redundant_Withs (Context_Items (N));
843 if Nkind (Unit_Node) = N_Package_Body then
844 Check_Redundant_Withs
845 (Context_Items => Context_Items (N),
846 Spec_Context_Items => Context_Items (Lib_Unit));
850 -- The above call might have made Unit_Node an N_Subprogram_Body from
851 -- something else, so propagate any Acts_As_Spec flag.
853 if Nkind (Unit_Node) = N_Subprogram_Body
854 and then Acts_As_Spec (Unit_Node)
856 Set_Acts_As_Spec (N);
859 -- Register predefined units in Rtsfind
862 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
864 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
865 Set_RTU_Loaded (Unit_Node);
869 -- Treat compilation unit pragmas that appear after the library unit
871 if Present (Pragmas_After (Aux_Decls_Node (N))) then
873 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
875 while Present (Prag_Node) loop
882 -- Generate distribution stubs if requested and no error
885 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
887 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
888 and then not Fatal_Error (Main_Unit)
890 if Is_RCI_Pkg_Spec_Or_Body (N) then
892 -- Regular RCI package
894 Add_Stub_Constructs (N);
896 elsif (Nkind (Unit_Node) = N_Package_Declaration
897 and then Is_Shared_Passive (Defining_Entity
898 (Specification (Unit_Node))))
899 or else (Nkind (Unit_Node) = N_Package_Body
901 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
903 -- Shared passive package
905 Add_Stub_Constructs (N);
907 elsif Nkind (Unit_Node) = N_Package_Instantiation
909 Is_Remote_Call_Interface
910 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
912 -- Instantiation of a RCI generic package
914 Add_Stub_Constructs (N);
918 -- Remove unit from visibility, so that environment is clean for
919 -- the next compilation, which is either the main unit or some
920 -- other unit in the context.
922 if Nkind_In (Unit_Node, N_Package_Declaration,
923 N_Package_Renaming_Declaration,
924 N_Subprogram_Declaration)
925 or else Nkind (Unit_Node) in N_Generic_Declaration
927 (Nkind (Unit_Node) = N_Subprogram_Body
928 and then Acts_As_Spec (Unit_Node))
930 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
932 -- If the unit is an instantiation whose body will be elaborated for
933 -- inlining purposes, use the proper entity of the instance. The
934 -- entity may be missing if the instantiation was illegal.
936 elsif Nkind (Unit_Node) = N_Package_Instantiation
937 and then not Error_Posted (Unit_Node)
938 and then Present (Instance_Spec (Unit_Node))
940 Remove_Unit_From_Visibility
941 (Defining_Entity (Instance_Spec (Unit_Node)));
943 elsif Nkind (Unit_Node) = N_Package_Body
944 or else (Nkind (Unit_Node) = N_Subprogram_Body
945 and then not Acts_As_Spec (Unit_Node))
947 -- Bodies that are not the main unit are compiled if they are generic
948 -- or contain generic or inlined units. Their analysis brings in the
949 -- context of the corresponding spec (unit declaration) which must be
950 -- removed as well, to return the compilation environment to its
953 Remove_Context (Lib_Unit);
954 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
957 -- Last step is to deinstall the context we just installed as well as
958 -- the unit just compiled.
962 -- If this is the main unit and we are generating code, we must check
963 -- that all generic units in the context have a body if they need it,
964 -- even if they have not been instantiated. In the absence of .ali files
965 -- for generic units, we must force the load of the body, just to
966 -- produce the proper error if the body is absent. We skip this
967 -- verification if the main unit itself is generic.
969 if Get_Cunit_Unit_Number (N) = Main_Unit
970 and then Operating_Mode = Generate_Code
971 and then Expander_Active
973 -- Check whether the source for the body of the unit must be included
974 -- in a standalone library.
976 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
978 -- Indicate that the main unit is now analyzed, to catch possible
979 -- circularities between it and generic bodies. Remove main unit from
980 -- visibility. This might seem superfluous, but the main unit must
981 -- not be visible in the generic body expansions that follow.
983 Set_Analyzed (N, True);
984 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
989 Un : Unit_Number_Type;
991 Save_Style_Check : constant Boolean := Style_Check;
992 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
993 Cunit_Boolean_Restrictions_Save;
996 Item := First (Context_Items (N));
997 while Present (Item) loop
999 -- Check for explicit with clause
1001 if Nkind (Item) = N_With_Clause
1002 and then not Implicit_With (Item)
1004 -- Ada 2005 (AI-50217): Ignore limited-withed units
1006 and then not Limited_Present (Item)
1008 Nam := Entity (Name (Item));
1010 -- Compile generic subprogram, unless it is intrinsic or
1011 -- imported so no body is required, or generic package body
1012 -- if the package spec requires a body.
1014 if (Is_Generic_Subprogram (Nam)
1015 and then not Is_Intrinsic_Subprogram (Nam)
1016 and then not Is_Imported (Nam))
1017 or else (Ekind (Nam) = E_Generic_Package
1018 and then Unit_Requires_Body (Nam))
1020 Style_Check := False;
1022 if Present (Renamed_Object (Nam)) then
1025 (Load_Name => Get_Body_Name
1027 (Unit_Declaration_Node
1028 (Renamed_Object (Nam)))),
1036 (Load_Name => Get_Body_Name
1037 (Get_Unit_Name (Item)),
1044 if Un = No_Unit then
1046 ("body of generic unit& not found", Item, Nam);
1049 elsif not Analyzed (Cunit (Un))
1050 and then Un /= Main_Unit
1051 and then not Fatal_Error (Un)
1053 Style_Check := False;
1054 Semantics (Cunit (Un));
1062 Style_Check := Save_Style_Check;
1063 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1067 -- Deal with creating elaboration Boolean if needed. We create an
1068 -- elaboration boolean only for units that come from source since
1069 -- units manufactured by the compiler never need elab checks.
1071 if Comes_From_Source (N)
1072 and then Nkind_In (Unit_Node, N_Package_Declaration,
1073 N_Generic_Package_Declaration,
1074 N_Subprogram_Declaration,
1075 N_Generic_Subprogram_Declaration)
1078 Loc : constant Source_Ptr := Sloc (N);
1079 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1082 Spec_Id := Defining_Entity (Unit_Node);
1083 Generate_Definition (Spec_Id);
1085 -- See if an elaboration entity is required for possible access
1086 -- before elaboration checking. Note that we must allow for this
1087 -- even if -gnatE is not set, since a client may be compiled in
1088 -- -gnatE mode and reference the entity.
1090 -- These entities are also used by the binder to prevent multiple
1091 -- attempts to execute the elaboration code for the library case
1092 -- where the elaboration routine might otherwise be called more
1095 -- Case of units which do not require elaboration checks
1098 -- Pure units do not need checks
1102 -- Preelaborated units do not need checks
1104 or else Is_Preelaborated (Spec_Id)
1106 -- No checks needed if pragma Elaborate_Body present
1108 or else Has_Pragma_Elaborate_Body (Spec_Id)
1110 -- No checks needed if unit does not require a body
1112 or else not Unit_Requires_Body (Spec_Id)
1114 -- No checks needed for predefined files
1116 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1118 -- No checks required if no separate spec
1120 or else Acts_As_Spec (N)
1122 -- This is a case where we only need the entity for
1123 -- checking to prevent multiple elaboration checks.
1125 Set_Elaboration_Entity_Required (Spec_Id, False);
1127 -- Case of elaboration entity is required for access before
1128 -- elaboration checking (so certainly we must build it!)
1131 Set_Elaboration_Entity_Required (Spec_Id, True);
1134 Build_Elaboration_Entity (N, Spec_Id);
1138 -- Freeze the compilation unit entity. This for sure is needed because
1139 -- of some warnings that can be output (see Freeze_Subprogram), but may
1140 -- in general be required. If freezing actions result, place them in the
1141 -- compilation unit actions list, and analyze them.
1144 Loc : constant Source_Ptr := Sloc (N);
1145 L : constant List_Id :=
1146 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), Loc);
1148 while Is_Non_Empty_List (L) loop
1149 Insert_Library_Level_Action (Remove_Head (L));
1155 if Nkind (Unit_Node) = N_Package_Declaration
1156 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1157 and then Expander_Active
1160 Save_Style_Check : constant Boolean := Style_Check;
1161 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1162 Options : Style_Check_Options;
1165 Save_Style_Check_Options (Options);
1166 Reset_Style_Check_Options;
1167 Opt.Warning_Mode := Suppress;
1168 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1170 Reset_Style_Check_Options;
1171 Set_Style_Check_Options (Options);
1172 Style_Check := Save_Style_Check;
1173 Warning_Mode := Save_Warning;
1177 -- If we are generating obsolescent warnings, then here is where we
1178 -- generate them for the with'ed items. The reason for this special
1179 -- processing is that the normal mechanism of generating the warnings
1180 -- for referenced entities does not work for context clause references.
1181 -- That's because when we first analyze the context, it is too early to
1182 -- know if the with'ing unit is itself obsolescent (which suppresses
1185 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1187 -- Push current compilation unit as scope, so that the test for
1188 -- being within an obsolescent unit will work correctly.
1190 Push_Scope (Defining_Entity (Unit_Node));
1192 -- Loop through context items to deal with with clauses
1200 Item := First (Context_Items (N));
1201 while Present (Item) loop
1202 if Nkind (Item) = N_With_Clause
1204 -- Suppress this check in limited-withed units. Further work
1205 -- needed here if we decide to incorporate this check on
1206 -- limited-withed units.
1208 and then not Limited_Present (Item)
1211 Ent := Entity (Nam);
1213 if Is_Obsolescent (Ent) then
1214 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1222 -- Remove temporary install of current unit as scope
1226 end Analyze_Compilation_Unit;
1228 ---------------------
1229 -- Analyze_Context --
1230 ---------------------
1232 procedure Analyze_Context (N : Node_Id) is
1233 Ukind : constant Node_Kind := Nkind (Unit (N));
1237 -- First process all configuration pragmas at the start of the context
1238 -- items. Strictly these are not part of the context clause, but that
1239 -- is where the parser puts them. In any case for sure we must analyze
1240 -- these before analyzing the actual context items, since they can have
1241 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1242 -- be with'ed as a result of changing categorizations in Ada 2005).
1244 Item := First (Context_Items (N));
1245 while Present (Item)
1246 and then Nkind (Item) = N_Pragma
1247 and then Pragma_Name (Item) in Configuration_Pragma_Names
1253 -- This is the point at which we capture the configuration settings
1254 -- for the unit. At the moment only the Optimize_Alignment setting
1255 -- needs to be captured. Probably more later ???
1257 if Optimize_Alignment_Local then
1258 Set_OA_Setting (Current_Sem_Unit, 'L');
1260 Set_OA_Setting (Current_Sem_Unit, Optimize_Alignment);
1263 -- Loop through actual context items. This is done in two passes:
1265 -- a) The first pass analyzes non-limited with-clauses and also any
1266 -- configuration pragmas (we need to get the latter analyzed right
1267 -- away, since they can affect processing of subsequent items.
1269 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1271 while Present (Item) loop
1273 -- For with clause, analyze the with clause, and then update
1274 -- the version, since we are dependent on a unit that we with.
1276 if Nkind (Item) = N_With_Clause
1277 and then not Limited_Present (Item)
1279 -- Skip analyzing with clause if no unit, nothing to do (this
1280 -- happens for a with that references a non-existent unit)
1281 -- Skip as well if this is a with_clause for the main unit, which
1282 -- happens if a subunit has a useless with_clause on its parent.
1284 if Present (Library_Unit (Item)) then
1285 if Library_Unit (Item) /= Cunit (Current_Sem_Unit) then
1289 Set_Entity (Name (Item), Cunit_Entity (Current_Sem_Unit));
1293 if not Implicit_With (Item) then
1294 Version_Update (N, Library_Unit (Item));
1297 -- Skip pragmas. Configuration pragmas at the start were handled in
1298 -- the loop above, and remaining pragmas are not processed until we
1299 -- actually install the context (see Install_Context). We delay the
1300 -- analysis of these pragmas to make sure that we have installed all
1301 -- the implicit with's on parent units.
1303 -- Skip use clauses at this stage, since we don't want to do any
1304 -- installing of potentially use-visible entities until we
1305 -- actually install the complete context (in Install_Context).
1306 -- Otherwise things can get installed in the wrong context.
1315 -- Second pass: examine all limited_with clauses. All other context
1316 -- items are ignored in this pass.
1318 Item := First (Context_Items (N));
1319 while Present (Item) loop
1320 if Nkind (Item) = N_With_Clause
1321 and then Limited_Present (Item)
1323 -- No need to check errors on implicitly generated limited-with
1326 if not Implicit_With (Item) then
1328 -- Verify that the illegal contexts given in 10.1.2 (18/2)
1329 -- are properly rejected, including renaming declarations.
1331 if not Nkind_In (Ukind, N_Package_Declaration,
1332 N_Subprogram_Declaration)
1333 and then Ukind not in N_Generic_Declaration
1334 and then Ukind not in N_Generic_Instantiation
1336 Error_Msg_N ("limited with_clause not allowed here", Item);
1338 -- Check wrong use of a limited with clause applied to the
1339 -- compilation unit containing the limited-with clause.
1341 -- limited with P.Q;
1342 -- package P.Q is ...
1344 elsif Unit (Library_Unit (Item)) = Unit (N) then
1345 Error_Msg_N ("wrong use of limited-with clause", Item);
1347 -- Check wrong use of limited-with clause applied to some
1348 -- immediate ancestor.
1350 elsif Is_Child_Spec (Unit (N)) then
1352 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1356 P := Parent_Spec (Unit (N));
1358 if Unit (P) = Lib_U then
1359 Error_Msg_N ("limited with_clause of immediate "
1360 & "ancestor not allowed", Item);
1364 exit when not Is_Child_Spec (Unit (P));
1365 P := Parent_Spec (Unit (P));
1370 -- Check if the limited-withed unit is already visible through
1371 -- some context clause of the current compilation unit or some
1372 -- ancestor of the current compilation unit.
1375 Lim_Unit_Name : constant Node_Id := Name (Item);
1376 Comp_Unit : Node_Id;
1378 Unit_Name : Node_Id;
1383 It := First (Context_Items (Comp_Unit));
1384 while Present (It) loop
1386 and then Nkind (It) = N_With_Clause
1387 and then not Limited_Present (It)
1389 Nkind_In (Unit (Library_Unit (It)),
1390 N_Package_Declaration,
1391 N_Package_Renaming_Declaration)
1393 if Nkind (Unit (Library_Unit (It))) =
1394 N_Package_Declaration
1396 Unit_Name := Name (It);
1398 Unit_Name := Name (Unit (Library_Unit (It)));
1401 -- Check if the named package (or some ancestor)
1402 -- leaves visible the full-view of the unit given
1403 -- in the limited-with clause
1406 if Designate_Same_Unit (Lim_Unit_Name,
1409 Error_Msg_Sloc := Sloc (It);
1411 ("simultaneous visibility of limited "
1412 & "and unlimited views not allowed",
1415 ("\unlimited view visible through "
1416 & "context clause #",
1420 elsif Nkind (Unit_Name) = N_Identifier then
1424 Unit_Name := Prefix (Unit_Name);
1431 exit when not Is_Child_Spec (Unit (Comp_Unit));
1433 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1438 -- Skip analyzing with clause if no unit, see above
1440 if Present (Library_Unit (Item)) then
1444 -- A limited_with does not impose an elaboration order, but
1445 -- there is a semantic dependency for recompilation purposes.
1447 if not Implicit_With (Item) then
1448 Version_Update (N, Library_Unit (Item));
1451 -- Pragmas and use clauses and with clauses other than limited
1452 -- with's are ignored in this pass through the context items.
1460 end Analyze_Context;
1462 -------------------------------
1463 -- Analyze_Package_Body_Stub --
1464 -------------------------------
1466 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1467 Id : constant Entity_Id := Defining_Identifier (N);
1471 -- The package declaration must be in the current declarative part
1473 Check_Stub_Level (N);
1474 Nam := Current_Entity_In_Scope (Id);
1476 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1477 Error_Msg_N ("missing specification for package stub", N);
1479 elsif Has_Completion (Nam)
1480 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1482 Error_Msg_N ("duplicate or redundant stub for package", N);
1485 -- Indicate that the body of the package exists. If we are doing
1486 -- only semantic analysis, the stub stands for the body. If we are
1487 -- generating code, the existence of the body will be confirmed
1488 -- when we load the proper body.
1490 Set_Has_Completion (Nam);
1491 Set_Scope (Defining_Entity (N), Current_Scope);
1492 Generate_Reference (Nam, Id, 'b');
1493 Analyze_Proper_Body (N, Nam);
1495 end Analyze_Package_Body_Stub;
1497 -------------------------
1498 -- Analyze_Proper_Body --
1499 -------------------------
1501 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1502 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1503 Unum : Unit_Number_Type;
1505 procedure Optional_Subunit;
1506 -- This procedure is called when the main unit is a stub, or when we
1507 -- are not generating code. In such a case, we analyze the subunit if
1508 -- present, which is user-friendly and in fact required for ASIS, but
1509 -- we don't complain if the subunit is missing.
1511 ----------------------
1512 -- Optional_Subunit --
1513 ----------------------
1515 procedure Optional_Subunit is
1516 Comp_Unit : Node_Id;
1519 -- Try to load subunit, but ignore any errors that occur during
1520 -- the loading of the subunit, by using the special feature in
1521 -- Errout to ignore all errors. Note that Fatal_Error will still
1522 -- be set, so we will be able to check for this case below.
1524 if not ASIS_Mode then
1525 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1530 (Load_Name => Subunit_Name,
1535 if not ASIS_Mode then
1536 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1539 -- All done if we successfully loaded the subunit
1542 and then (not Fatal_Error (Unum) or else Try_Semantics)
1544 Comp_Unit := Cunit (Unum);
1546 -- If the file was empty or seriously mangled, the unit
1547 -- itself may be missing.
1549 if No (Unit (Comp_Unit)) then
1551 ("subunit does not contain expected proper body", N);
1553 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1555 ("expected SEPARATE subunit, found child unit",
1556 Cunit_Entity (Unum));
1558 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1559 Analyze_Subunit (Comp_Unit);
1560 Set_Library_Unit (N, Comp_Unit);
1563 elsif Unum = No_Unit
1564 and then Present (Nam)
1566 if Is_Protected_Type (Nam) then
1567 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1569 Set_Corresponding_Body (
1570 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1573 end Optional_Subunit;
1575 -- Start of processing for Analyze_Proper_Body
1578 -- If the subunit is already loaded, it means that the main unit
1579 -- is a subunit, and that the current unit is one of its parents
1580 -- which was being analyzed to provide the needed context for the
1581 -- analysis of the subunit. In this case we analyze the subunit and
1582 -- continue with the parent, without looking a subsequent subunits.
1584 if Is_Loaded (Subunit_Name) then
1586 -- If the proper body is already linked to the stub node,
1587 -- the stub is in a generic unit and just needs analyzing.
1589 if Present (Library_Unit (N)) then
1590 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1591 Analyze_Subunit (Library_Unit (N));
1593 -- Otherwise we must load the subunit and link to it
1596 -- Load the subunit, this must work, since we originally
1597 -- loaded the subunit earlier on. So this will not really
1598 -- load it, just give access to it.
1602 (Load_Name => Subunit_Name,
1607 -- And analyze the subunit in the parent context (note that we
1608 -- do not call Semantics, since that would remove the parent
1609 -- context). Because of this, we have to manually reset the
1610 -- compiler state to Analyzing since it got destroyed by Load.
1612 if Unum /= No_Unit then
1613 Compiler_State := Analyzing;
1615 -- Check that the proper body is a subunit and not a child
1616 -- unit. If the unit was previously loaded, the error will
1617 -- have been emitted when copying the generic node, so we
1618 -- just return to avoid cascaded errors.
1620 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1624 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1625 Analyze_Subunit (Cunit (Unum));
1626 Set_Library_Unit (N, Cunit (Unum));
1630 -- If the main unit is a subunit, then we are just performing semantic
1631 -- analysis on that subunit, and any other subunits of any parent unit
1632 -- should be ignored, except that if we are building trees for ASIS
1633 -- usage we want to annotate the stub properly.
1635 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1636 and then Subunit_Name /= Unit_Name (Main_Unit)
1642 -- But before we return, set the flag for unloaded subunits. This
1643 -- will suppress junk warnings of variables in the same declarative
1644 -- part (or a higher level one) that are in danger of looking unused
1645 -- when in fact there might be a declaration in the subunit that we
1646 -- do not intend to load.
1648 Unloaded_Subunits := True;
1651 -- If the subunit is not already loaded, and we are generating code,
1652 -- then this is the case where compilation started from the parent,
1653 -- and we are generating code for an entire subunit tree. In that
1654 -- case we definitely need to load the subunit.
1656 -- In order to continue the analysis with the rest of the parent,
1657 -- and other subunits, we load the unit without requiring its
1658 -- presence, and emit a warning if not found, rather than terminating
1659 -- the compilation abruptly, as for other missing file problems.
1661 elsif Original_Operating_Mode = Generate_Code then
1663 -- If the proper body is already linked to the stub node,
1664 -- the stub is in a generic unit and just needs analyzing.
1666 -- We update the version. Although we are not technically
1667 -- semantically dependent on the subunit, given our approach
1668 -- of macro substitution of subunits, it makes sense to
1669 -- include it in the version identification.
1671 if Present (Library_Unit (N)) then
1672 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1673 Analyze_Subunit (Library_Unit (N));
1674 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1676 -- Otherwise we must load the subunit and link to it
1681 (Load_Name => Subunit_Name,
1686 if Original_Operating_Mode = Generate_Code
1687 and then Unum = No_Unit
1689 Error_Msg_Unit_1 := Subunit_Name;
1691 Get_File_Name (Subunit_Name, Subunit => True);
1693 ("subunit$$ in file{ not found?", N);
1694 Subunits_Missing := True;
1697 -- Load_Unit may reset Compiler_State, since it may have been
1698 -- necessary to parse an additional units, so we make sure
1699 -- that we reset it to the Analyzing state.
1701 Compiler_State := Analyzing;
1703 if Unum /= No_Unit then
1704 if Debug_Flag_L then
1705 Write_Str ("*** Loaded subunit from stub. Analyze");
1710 Comp_Unit : constant Node_Id := Cunit (Unum);
1713 -- Check for child unit instead of subunit
1715 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1717 ("expected SEPARATE subunit, found child unit",
1718 Cunit_Entity (Unum));
1720 -- OK, we have a subunit
1723 -- Set corresponding stub (even if errors)
1725 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1727 -- Analyze the unit if semantics active
1729 if not Fatal_Error (Unum) or else Try_Semantics then
1730 Analyze_Subunit (Comp_Unit);
1733 -- Set the library unit pointer in any case
1735 Set_Library_Unit (N, Comp_Unit);
1737 -- We update the version. Although we are not technically
1738 -- semantically dependent on the subunit, given our
1739 -- approach of macro substitution of subunits, it makes
1740 -- sense to include it in the version identification.
1742 Version_Update (Cunit (Main_Unit), Comp_Unit);
1748 -- The remaining case is when the subunit is not already loaded and
1749 -- we are not generating code. In this case we are just performing
1750 -- semantic analysis on the parent, and we are not interested in
1751 -- the subunit. For subprograms, analyze the stub as a body. For
1752 -- other entities the stub has already been marked as completed.
1757 end Analyze_Proper_Body;
1759 ----------------------------------
1760 -- Analyze_Protected_Body_Stub --
1761 ----------------------------------
1763 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1764 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1767 Check_Stub_Level (N);
1769 -- First occurrence of name may have been as an incomplete type
1771 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1772 Nam := Full_View (Nam);
1776 or else not Is_Protected_Type (Etype (Nam))
1778 Error_Msg_N ("missing specification for Protected body", N);
1780 Set_Scope (Defining_Entity (N), Current_Scope);
1781 Set_Has_Completion (Etype (Nam));
1782 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1783 Analyze_Proper_Body (N, Etype (Nam));
1785 end Analyze_Protected_Body_Stub;
1787 ----------------------------------
1788 -- Analyze_Subprogram_Body_Stub --
1789 ----------------------------------
1791 -- A subprogram body stub can appear with or without a previous
1792 -- specification. If there is one, the analysis of the body will
1793 -- find it and verify conformance. The formals appearing in the
1794 -- specification of the stub play no role, except for requiring an
1795 -- additional conformance check. If there is no previous subprogram
1796 -- declaration, the stub acts as a spec, and provides the defining
1797 -- entity for the subprogram.
1799 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1803 Check_Stub_Level (N);
1805 -- Verify that the identifier for the stub is unique within this
1806 -- declarative part.
1808 if Nkind_In (Parent (N), N_Block_Statement,
1812 Decl := First (Declarations (Parent (N)));
1813 while Present (Decl)
1816 if Nkind (Decl) = N_Subprogram_Body_Stub
1817 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1818 Chars (Defining_Unit_Name (Specification (N))))
1820 Error_Msg_N ("identifier for stub is not unique", N);
1827 -- Treat stub as a body, which checks conformance if there is a previous
1828 -- declaration, or else introduces entity and its signature.
1830 Analyze_Subprogram_Body (N);
1831 Analyze_Proper_Body (N, Empty);
1832 end Analyze_Subprogram_Body_Stub;
1834 ---------------------
1835 -- Analyze_Subunit --
1836 ---------------------
1838 -- A subunit is compiled either by itself (for semantic checking)
1839 -- or as part of compiling the parent (for code generation). In
1840 -- either case, by the time we actually process the subunit, the
1841 -- parent has already been installed and analyzed. The node N is
1842 -- a compilation unit, whose context needs to be treated here,
1843 -- because we come directly here from the parent without calling
1844 -- Analyze_Compilation_Unit.
1846 -- The compilation context includes the explicit context of the
1847 -- subunit, and the context of the parent, together with the parent
1848 -- itself. In order to compile the current context, we remove the
1849 -- one inherited from the parent, in order to have a clean visibility
1850 -- table. We restore the parent context before analyzing the proper
1851 -- body itself. On exit, we remove only the explicit context of the
1854 procedure Analyze_Subunit (N : Node_Id) is
1855 Lib_Unit : constant Node_Id := Library_Unit (N);
1856 Par_Unit : constant Entity_Id := Current_Scope;
1858 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1859 Num_Scopes : Int := 0;
1860 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1861 Enclosing_Child : Entity_Id := Empty;
1862 Svg : constant Suppress_Array := Scope_Suppress;
1864 procedure Analyze_Subunit_Context;
1865 -- Capture names in use clauses of the subunit. This must be done
1866 -- before re-installing parent declarations, because items in the
1867 -- context must not be hidden by declarations local to the parent.
1869 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1870 -- Recursive procedure to restore scope of all ancestors of subunit,
1871 -- from outermost in. If parent is not a subunit, the call to install
1872 -- context installs context of spec and (if parent is a child unit)
1873 -- the context of its parents as well. It is confusing that parents
1874 -- should be treated differently in both cases, but the semantics are
1875 -- just not identical.
1877 procedure Re_Install_Use_Clauses;
1878 -- As part of the removal of the parent scope, the use clauses are
1879 -- removed, to be reinstalled when the context of the subunit has
1880 -- been analyzed. Use clauses may also have been affected by the
1881 -- analysis of the context of the subunit, so they have to be applied
1882 -- again, to insure that the compilation environment of the rest of
1883 -- the parent unit is identical.
1885 procedure Remove_Scope;
1886 -- Remove current scope from scope stack, and preserve the list
1887 -- of use clauses in it, to be reinstalled after context is analyzed.
1889 -----------------------------
1890 -- Analyze_Subunit_Context --
1891 -----------------------------
1893 procedure Analyze_Subunit_Context is
1896 Unit_Name : Entity_Id;
1899 Analyze_Context (N);
1901 -- Make withed units immediately visible. If child unit, make the
1902 -- ultimate parent immediately visible.
1904 Item := First (Context_Items (N));
1905 while Present (Item) loop
1906 if Nkind (Item) = N_With_Clause then
1908 -- Protect frontend against previous errors in context clauses
1910 if Nkind (Name (Item)) /= N_Selected_Component then
1911 if Error_Posted (Item) then
1915 Unit_Name := Entity (Name (Item));
1916 while Is_Child_Unit (Unit_Name) loop
1917 Set_Is_Visible_Child_Unit (Unit_Name);
1918 Unit_Name := Scope (Unit_Name);
1921 if not Is_Immediately_Visible (Unit_Name) then
1922 Set_Is_Immediately_Visible (Unit_Name);
1923 Set_Context_Installed (Item);
1928 elsif Nkind (Item) = N_Use_Package_Clause then
1929 Nam := First (Names (Item));
1930 while Present (Nam) loop
1935 elsif Nkind (Item) = N_Use_Type_Clause then
1936 Nam := First (Subtype_Marks (Item));
1937 while Present (Nam) loop
1946 -- Reset visibility of withed units. They will be made visible
1947 -- again when we install the subunit context.
1949 Item := First (Context_Items (N));
1950 while Present (Item) loop
1951 if Nkind (Item) = N_With_Clause
1953 -- Protect frontend against previous errors in context clauses
1955 and then Nkind (Name (Item)) /= N_Selected_Component
1956 and then not Error_Posted (Item)
1958 Unit_Name := Entity (Name (Item));
1959 while Is_Child_Unit (Unit_Name) loop
1960 Set_Is_Visible_Child_Unit (Unit_Name, False);
1961 Unit_Name := Scope (Unit_Name);
1964 if Context_Installed (Item) then
1965 Set_Is_Immediately_Visible (Unit_Name, False);
1966 Set_Context_Installed (Item, False);
1972 end Analyze_Subunit_Context;
1974 ------------------------
1975 -- Re_Install_Parents --
1976 ------------------------
1978 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
1982 if Nkind (Unit (L)) = N_Subunit then
1983 Re_Install_Parents (Library_Unit (L), Scope (Scop));
1986 Install_Context (L);
1988 -- If the subunit occurs within a child unit, we must restore the
1989 -- immediate visibility of any siblings that may occur in context.
1991 if Present (Enclosing_Child) then
1992 Install_Siblings (Enclosing_Child, L);
1997 if Scop /= Par_Unit then
1998 Set_Is_Immediately_Visible (Scop);
2001 -- Make entities in scope visible again. For child units, restore
2002 -- visibility only if they are actually in context.
2004 E := First_Entity (Current_Scope);
2005 while Present (E) loop
2006 if not Is_Child_Unit (E)
2007 or else Is_Visible_Child_Unit (E)
2009 Set_Is_Immediately_Visible (E);
2015 -- A subunit appears within a body, and for a nested subunits
2016 -- all the parents are bodies. Restore full visibility of their
2017 -- private entities.
2019 if Is_Package_Or_Generic_Package (Scop) then
2020 Set_In_Package_Body (Scop);
2021 Install_Private_Declarations (Scop);
2023 end Re_Install_Parents;
2025 ----------------------------
2026 -- Re_Install_Use_Clauses --
2027 ----------------------------
2029 procedure Re_Install_Use_Clauses is
2032 for J in reverse 1 .. Num_Scopes loop
2033 U := Use_Clauses (J);
2034 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2035 Install_Use_Clauses (U, Force_Installation => True);
2037 end Re_Install_Use_Clauses;
2043 procedure Remove_Scope is
2047 Num_Scopes := Num_Scopes + 1;
2048 Use_Clauses (Num_Scopes) :=
2049 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2051 E := First_Entity (Current_Scope);
2052 while Present (E) loop
2053 Set_Is_Immediately_Visible (E, False);
2057 if Is_Child_Unit (Current_Scope) then
2058 Enclosing_Child := Current_Scope;
2064 -- Start of processing for Analyze_Subunit
2067 if not Is_Empty_List (Context_Items (N)) then
2069 -- Save current use clauses
2072 Remove_Context (Lib_Unit);
2074 -- Now remove parents and their context, including enclosing
2075 -- subunits and the outer parent body which is not a subunit.
2077 if Present (Lib_Spec) then
2078 Remove_Context (Lib_Spec);
2080 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2081 Lib_Spec := Library_Unit (Lib_Spec);
2083 Remove_Context (Lib_Spec);
2086 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2090 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2091 Remove_Context (Library_Unit (Lib_Spec));
2095 Set_Is_Immediately_Visible (Par_Unit, False);
2097 Analyze_Subunit_Context;
2099 Re_Install_Parents (Lib_Unit, Par_Unit);
2100 Set_Is_Immediately_Visible (Par_Unit);
2102 -- If the context includes a child unit of the parent of the
2103 -- subunit, the parent will have been removed from visibility,
2104 -- after compiling that cousin in the context. The visibility
2105 -- of the parent must be restored now. This also applies if the
2106 -- context includes another subunit of the same parent which in
2107 -- turn includes a child unit in its context.
2109 if Is_Package_Or_Generic_Package (Par_Unit) then
2110 if not Is_Immediately_Visible (Par_Unit)
2111 or else (Present (First_Entity (Par_Unit))
2112 and then not Is_Immediately_Visible
2113 (First_Entity (Par_Unit)))
2115 Set_Is_Immediately_Visible (Par_Unit);
2116 Install_Visible_Declarations (Par_Unit);
2117 Install_Private_Declarations (Par_Unit);
2121 Re_Install_Use_Clauses;
2122 Install_Context (N);
2124 -- Restore state of suppress flags for current body
2126 Scope_Suppress := Svg;
2128 -- If the subunit is within a child unit, then siblings of any
2129 -- parent unit that appear in the context clause of the subunit
2130 -- must also be made immediately visible.
2132 if Present (Enclosing_Child) then
2133 Install_Siblings (Enclosing_Child, N);
2138 Analyze (Proper_Body (Unit (N)));
2141 -- The subunit may contain a with_clause on a sibling of some
2142 -- ancestor. Removing the context will remove from visibility those
2143 -- ancestor child units, which must be restored to the visibility
2144 -- they have in the enclosing body.
2146 if Present (Enclosing_Child) then
2152 and then Is_Child_Unit (C)
2154 Set_Is_Immediately_Visible (C);
2155 Set_Is_Visible_Child_Unit (C);
2160 end Analyze_Subunit;
2162 ----------------------------
2163 -- Analyze_Task_Body_Stub --
2164 ----------------------------
2166 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2167 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2168 Loc : constant Source_Ptr := Sloc (N);
2171 Check_Stub_Level (N);
2173 -- First occurrence of name may have been as an incomplete type
2175 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2176 Nam := Full_View (Nam);
2180 or else not Is_Task_Type (Etype (Nam))
2182 Error_Msg_N ("missing specification for task body", N);
2184 Set_Scope (Defining_Entity (N), Current_Scope);
2185 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2186 Set_Has_Completion (Etype (Nam));
2187 Analyze_Proper_Body (N, Etype (Nam));
2189 -- Set elaboration flag to indicate that entity is callable.
2190 -- This cannot be done in the expansion of the body itself,
2191 -- because the proper body is not in a declarative part. This
2192 -- is only done if expansion is active, because the context
2193 -- may be generic and the flag not defined yet.
2195 if Expander_Active then
2197 Make_Assignment_Statement (Loc,
2199 Make_Identifier (Loc,
2200 New_External_Name (Chars (Etype (Nam)), 'E')),
2201 Expression => New_Reference_To (Standard_True, Loc)));
2205 end Analyze_Task_Body_Stub;
2207 -------------------------
2208 -- Analyze_With_Clause --
2209 -------------------------
2211 -- Analyze the declaration of a unit in a with clause. At end,
2212 -- label the with clause with the defining entity for the unit.
2214 procedure Analyze_With_Clause (N : Node_Id) is
2216 -- Retrieve the original kind of the unit node, before analysis.
2217 -- If it is a subprogram instantiation, its analysis below will
2218 -- rewrite as the declaration of the wrapper package. If the same
2219 -- instantiation appears indirectly elsewhere in the context, it
2220 -- will have been analyzed already.
2222 Unit_Kind : constant Node_Kind :=
2223 Nkind (Original_Node (Unit (Library_Unit (N))));
2224 Nam : constant Node_Id := Name (N);
2226 Par_Name : Entity_Id;
2231 -- Set True if the unit currently being compiled is an internal unit
2233 Save_Style_Check : constant Boolean := Opt.Style_Check;
2234 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
2235 Cunit_Boolean_Restrictions_Save;
2238 U := Unit (Library_Unit (N));
2240 -- Several actions are skipped for dummy packages (those supplied for
2241 -- with's where no matching file could be found). Such packages are
2242 -- identified by the Sloc value being set to No_Location.
2244 if Limited_Present (N) then
2246 -- Ada 2005 (AI-50217): Build visibility structures but do not
2247 -- analyze the unit.
2249 if Sloc (U) /= No_Location then
2250 Build_Limited_Views (N);
2256 -- We reset ordinary style checking during the analysis of a with'ed
2257 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2258 -- definitely *does* apply to with'ed units).
2260 if not GNAT_Mode then
2261 Style_Check := False;
2264 -- If the library unit is a predefined unit, and we are in high
2265 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2266 -- for the analysis of the with'ed unit. This mode does not prevent
2267 -- explicit with'ing of run-time units.
2269 if Configurable_Run_Time_Mode
2271 Is_Predefined_File_Name
2272 (Unit_File_Name (Get_Source_Unit (Unit (Library_Unit (N)))))
2274 Configurable_Run_Time_Mode := False;
2275 Semantics (Library_Unit (N));
2276 Configurable_Run_Time_Mode := True;
2279 Semantics (Library_Unit (N));
2282 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2284 if Sloc (U) /= No_Location then
2286 -- Check restrictions, except that we skip the check if this is an
2287 -- internal unit unless we are compiling the internal unit as the
2288 -- main unit. We also skip this for dummy packages.
2290 Check_Restriction_No_Dependence (Nam, N);
2292 if not Intunit or else Current_Sem_Unit = Main_Unit then
2293 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2296 -- Deal with special case of GNAT.Current_Exceptions which interacts
2297 -- with the optimization of local raise statements into gotos.
2299 if Nkind (Nam) = N_Selected_Component
2300 and then Nkind (Prefix (Nam)) = N_Identifier
2301 and then Chars (Prefix (Nam)) = Name_Gnat
2302 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2304 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2306 Check_Restriction (No_Exception_Propagation, N);
2307 Special_Exception_Package_Used := True;
2310 -- Check for inappropriate with of internal implementation unit if we
2311 -- are currently compiling the main unit and the main unit is itself
2312 -- not an internal unit. We do not issue this message for implicit
2313 -- with's generated by the compiler itself.
2315 if Implementation_Unit_Warnings
2316 and then Current_Sem_Unit = Main_Unit
2317 and then not Intunit
2318 and then not Implicit_With (N)
2319 and then not GNAT_Mode
2322 U_Kind : constant Kind_Of_Unit :=
2323 Get_Kind_Of_Unit (Get_Source_Unit (U));
2326 if U_Kind = Implementation_Unit then
2327 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2329 ("\use of this unit is non-portable " &
2330 "and version-dependent?",
2333 elsif U_Kind = Ada_05_Unit
2334 and then Ada_Version < Ada_05
2335 and then Warn_On_Ada_2005_Compatibility
2337 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2343 -- Semantic analysis of a generic unit is performed on a copy of
2344 -- the original tree. Retrieve the entity on which semantic info
2345 -- actually appears.
2347 if Unit_Kind in N_Generic_Declaration then
2348 E_Name := Defining_Entity (U);
2350 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2351 -- the case of an instantiation, semantic analysis above will have
2352 -- replaced the unit by its instantiated version. If the instance body
2353 -- has been generated, the instance now denotes the body entity. For
2354 -- visibility purposes we need the entity of its spec.
2356 elsif (Unit_Kind = N_Package_Instantiation
2357 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2358 N_Package_Instantiation)
2359 and then Nkind (U) = N_Package_Body
2361 E_Name := Corresponding_Spec (U);
2363 elsif Unit_Kind = N_Package_Instantiation
2364 and then Nkind (U) = N_Package_Instantiation
2366 -- If the instance has not been rewritten as a package declaration,
2367 -- then it appeared already in a previous with clause. Retrieve
2368 -- the entity from the previous instance.
2370 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2372 elsif Unit_Kind in N_Subprogram_Instantiation then
2374 -- Instantiation node is replaced with a wrapper package. Retrieve
2375 -- the visible subprogram created by the instance from corresponding
2376 -- attribute of the wrapper.
2378 E_Name := Related_Instance (Defining_Entity (U));
2380 elsif Unit_Kind = N_Package_Renaming_Declaration
2381 or else Unit_Kind in N_Generic_Renaming_Declaration
2383 E_Name := Defining_Entity (U);
2385 elsif Unit_Kind = N_Subprogram_Body
2386 and then Nkind (Name (N)) = N_Selected_Component
2387 and then not Acts_As_Spec (Library_Unit (N))
2389 -- For a child unit that has no spec, one has been created and
2390 -- analyzed. The entity required is that of the spec.
2392 E_Name := Corresponding_Spec (U);
2395 E_Name := Defining_Entity (U);
2398 if Nkind (Name (N)) = N_Selected_Component then
2400 -- Child unit in a with clause
2402 Change_Selected_Component_To_Expanded_Name (Name (N));
2405 -- Restore style checks and restrictions
2407 Style_Check := Save_Style_Check;
2408 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2410 -- Record the reference, but do NOT set the unit as referenced, we want
2411 -- to consider the unit as unreferenced if this is the only reference
2414 Set_Entity_With_Style_Check (Name (N), E_Name);
2415 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2417 -- Generate references and check No_Dependence restriction for parents
2419 if Is_Child_Unit (E_Name) then
2420 Pref := Prefix (Name (N));
2421 Par_Name := Scope (E_Name);
2422 while Nkind (Pref) = N_Selected_Component loop
2423 Change_Selected_Component_To_Expanded_Name (Pref);
2424 Set_Entity_With_Style_Check (Pref, Par_Name);
2426 Generate_Reference (Par_Name, Pref);
2427 Check_Restriction_No_Dependence (Pref, N);
2428 Pref := Prefix (Pref);
2430 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2431 -- is set to Standard_Standard, and no attempt should be made to
2432 -- further unwind scopes.
2434 if Par_Name /= Standard_Standard then
2435 Par_Name := Scope (Par_Name);
2439 if Present (Entity (Pref))
2440 and then not Analyzed (Parent (Parent (Entity (Pref))))
2442 -- If the entity is set without its unit being compiled, the
2443 -- original parent is a renaming, and Par_Name is the renamed
2444 -- entity. For visibility purposes, we need the original entity,
2445 -- which must be analyzed now because Load_Unit directly retrieves
2446 -- the renamed unit, and the renaming declaration itself has not
2449 Analyze (Parent (Parent (Entity (Pref))));
2450 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2451 Par_Name := Entity (Pref);
2454 Set_Entity_With_Style_Check (Pref, Par_Name);
2455 Generate_Reference (Par_Name, Pref);
2458 -- If the withed unit is System, and a system extension pragma is
2459 -- present, compile the extension now, rather than waiting for a
2460 -- visibility check on a specific entity.
2462 if Chars (E_Name) = Name_System
2463 and then Scope (E_Name) = Standard_Standard
2464 and then Present (System_Extend_Unit)
2465 and then Present_System_Aux (N)
2467 -- If the extension is not present, an error will have been emitted
2472 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2473 -- to private_with units; they will be made visible later (just before
2474 -- the private part is analyzed)
2476 if Private_Present (N) then
2477 Set_Is_Immediately_Visible (E_Name, False);
2479 end Analyze_With_Clause;
2481 ------------------------------
2482 -- Check_Private_Child_Unit --
2483 ------------------------------
2485 procedure Check_Private_Child_Unit (N : Node_Id) is
2486 Lib_Unit : constant Node_Id := Unit (N);
2488 Curr_Unit : Entity_Id;
2489 Sub_Parent : Node_Id;
2490 Priv_Child : Entity_Id;
2491 Par_Lib : Entity_Id;
2494 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2495 -- Returns true if and only if the library unit is declared with
2496 -- an explicit designation of private.
2498 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2499 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2502 return Private_Present (Comp_Unit);
2503 end Is_Private_Library_Unit;
2505 -- Start of processing for Check_Private_Child_Unit
2508 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2509 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2510 Par_Lib := Curr_Unit;
2512 elsif Nkind (Lib_Unit) = N_Subunit then
2514 -- The parent is itself a body. The parent entity is to be found in
2515 -- the corresponding spec.
2517 Sub_Parent := Library_Unit (N);
2518 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2520 -- If the parent itself is a subunit, Curr_Unit is the entity
2521 -- of the enclosing body, retrieve the spec entity which is
2522 -- the proper ancestor we need for the following tests.
2524 if Ekind (Curr_Unit) = E_Package_Body then
2525 Curr_Unit := Spec_Entity (Curr_Unit);
2528 Par_Lib := Curr_Unit;
2531 Curr_Unit := Defining_Entity (Lib_Unit);
2533 Par_Lib := Curr_Unit;
2534 Par_Spec := Parent_Spec (Lib_Unit);
2536 if No (Par_Spec) then
2539 Par_Lib := Defining_Entity (Unit (Par_Spec));
2543 -- Loop through context items
2545 Item := First (Context_Items (N));
2546 while Present (Item) loop
2548 -- Ada 2005 (AI-262): Allow private_with of a private child package
2549 -- in public siblings
2551 if Nkind (Item) = N_With_Clause
2552 and then not Implicit_With (Item)
2553 and then not Limited_Present (Item)
2554 and then Is_Private_Descendant (Entity (Name (Item)))
2556 Priv_Child := Entity (Name (Item));
2559 Curr_Parent : Entity_Id := Par_Lib;
2560 Child_Parent : Entity_Id := Scope (Priv_Child);
2561 Prv_Ancestor : Entity_Id := Child_Parent;
2562 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2565 -- If the child unit is a public child then locate the nearest
2566 -- private ancestor. Child_Parent will then be set to the
2567 -- parent of that ancestor.
2569 if not Is_Private_Library_Unit (Priv_Child) then
2570 while Present (Prv_Ancestor)
2571 and then not Is_Private_Library_Unit (Prv_Ancestor)
2573 Prv_Ancestor := Scope (Prv_Ancestor);
2576 if Present (Prv_Ancestor) then
2577 Child_Parent := Scope (Prv_Ancestor);
2581 while Present (Curr_Parent)
2582 and then Curr_Parent /= Standard_Standard
2583 and then Curr_Parent /= Child_Parent
2586 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2587 Curr_Parent := Scope (Curr_Parent);
2590 if No (Curr_Parent) then
2591 Curr_Parent := Standard_Standard;
2594 if Curr_Parent /= Child_Parent then
2595 if Ekind (Priv_Child) = E_Generic_Package
2596 and then Chars (Priv_Child) in Text_IO_Package_Name
2597 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2600 ("& is a nested package, not a compilation unit",
2601 Name (Item), Priv_Child);
2605 ("unit in with clause is private child unit!", Item);
2607 ("\current unit must also have parent&!",
2608 Item, Child_Parent);
2612 or else Private_Present (Item)
2613 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2614 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2615 and then not Acts_As_Spec (Parent (Lib_Unit)))
2621 ("current unit must also be private descendant of&",
2622 Item, Child_Parent);
2630 end Check_Private_Child_Unit;
2632 ----------------------
2633 -- Check_Stub_Level --
2634 ----------------------
2636 procedure Check_Stub_Level (N : Node_Id) is
2637 Par : constant Node_Id := Parent (N);
2638 Kind : constant Node_Kind := Nkind (Par);
2641 if Nkind_In (Kind, N_Package_Body,
2645 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2649 -- In an instance, a missing stub appears at any level. A warning
2650 -- message will have been emitted already for the missing file.
2652 elsif not In_Instance then
2653 Error_Msg_N ("stub cannot appear in an inner scope", N);
2655 elsif Expander_Active then
2656 Error_Msg_N ("missing proper body", N);
2658 end Check_Stub_Level;
2660 ------------------------
2661 -- Expand_With_Clause --
2662 ------------------------
2664 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2665 Loc : constant Source_Ptr := Sloc (Nam);
2666 Ent : constant Entity_Id := Entity (Nam);
2670 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2671 -- Build name to be used in implicit with_clause. In most cases this
2672 -- is the source name, but if renamings are present we must make the
2673 -- original unit visible, not the one it renames. The entity in the
2674 -- with clause is the renamed unit, but the identifier is the one from
2675 -- the source, which allows us to recover the unit renaming.
2677 ---------------------
2678 -- Build_Unit_Name --
2679 ---------------------
2681 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2683 Renaming : Entity_Id;
2687 if Nkind (Nam) = N_Identifier then
2689 -- If the parent unit P in the name of the with_clause for P.Q
2690 -- is a renaming of package R, then the entity of the parent is
2691 -- set to R, but the identifier retains Chars (P) to be consistent
2692 -- with the source (see details in lib-load). However, the
2693 -- implicit_with_clause for the parent must make the entity for
2694 -- P visible, because P.Q may be used as a prefix within the
2695 -- current unit. The entity for P is the current_entity with that
2696 -- name, because the package renaming declaration for it has just
2697 -- been analyzed. Note that this case can only happen if P.Q has
2698 -- already appeared in a previous with_clause in a related unit,
2699 -- such as the library body of the current unit.
2701 if Chars (Nam) /= Chars (Entity (Nam)) then
2702 Renaming := Current_Entity (Nam);
2703 pragma Assert (Renamed_Entity (Renaming) = Entity (Nam));
2704 return New_Occurrence_Of (Renaming, Loc);
2707 return New_Occurrence_Of (Entity (Nam), Loc);
2711 Ent := Entity (Nam);
2713 if Present (Entity (Selector_Name (Nam)))
2714 and then Chars (Entity (Selector_Name (Nam))) /= Chars (Ent)
2716 Nkind (Unit_Declaration_Node (Entity (Selector_Name (Nam))))
2717 = N_Package_Renaming_Declaration
2719 -- The name in the with_clause is of the form A.B.C, and B
2720 -- is given by a renaming declaration. In that case we may
2721 -- not have analyzed the unit for B, but replaced it directly
2722 -- in lib-load with the unit it renames. We have to make A.B
2723 -- visible, so analyze the declaration for B now, in case it
2724 -- has not been done yet.
2726 Ent := Entity (Selector_Name (Nam));
2729 (Unit_Declaration_Node (Entity (Selector_Name (Nam)))));
2733 Make_Expanded_Name (Loc,
2734 Chars => Chars (Entity (Nam)),
2735 Prefix => Build_Unit_Name (Prefix (Nam)),
2736 Selector_Name => New_Occurrence_Of (Ent, Loc));
2737 Set_Entity (Result, Ent);
2740 end Build_Unit_Name;
2742 -- Start of processing for Expand_With_Clause
2745 New_Nodes_OK := New_Nodes_OK + 1;
2747 Make_With_Clause (Loc,
2748 Name => Build_Unit_Name (Nam));
2750 P := Parent (Unit_Declaration_Node (Ent));
2751 Set_Library_Unit (Withn, P);
2752 Set_Corresponding_Spec (Withn, Ent);
2753 Set_First_Name (Withn, True);
2754 Set_Implicit_With (Withn, True);
2756 -- If the unit is a package declaration, a private_with_clause on a
2757 -- child unit implies that the implicit with on the parent is also
2760 if Nkind (Unit (N)) = N_Package_Declaration then
2761 Set_Private_Present (Withn, Private_Present (Item));
2764 Prepend (Withn, Context_Items (N));
2765 Mark_Rewrite_Insertion (Withn);
2766 Install_Withed_Unit (Withn);
2768 if Nkind (Nam) = N_Expanded_Name then
2769 Expand_With_Clause (Item, Prefix (Nam), N);
2772 New_Nodes_OK := New_Nodes_OK - 1;
2773 end Expand_With_Clause;
2775 -----------------------
2776 -- Get_Parent_Entity --
2777 -----------------------
2779 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2781 if Nkind (Unit) = N_Package_Body
2782 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2784 return Defining_Entity
2785 (Specification (Instance_Spec (Original_Node (Unit))));
2786 elsif Nkind (Unit) = N_Package_Instantiation then
2787 return Defining_Entity (Specification (Instance_Spec (Unit)));
2789 return Defining_Entity (Unit);
2791 end Get_Parent_Entity;
2793 -----------------------------
2794 -- Implicit_With_On_Parent --
2795 -----------------------------
2797 procedure Implicit_With_On_Parent
2798 (Child_Unit : Node_Id;
2801 Loc : constant Source_Ptr := Sloc (N);
2802 P : constant Node_Id := Parent_Spec (Child_Unit);
2803 P_Unit : Node_Id := Unit (P);
2804 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
2807 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
2808 -- Build prefix of child unit name. Recurse if needed
2810 function Build_Unit_Name return Node_Id;
2811 -- If the unit is a child unit, build qualified name with all ancestors
2813 -------------------------
2814 -- Build_Ancestor_Name --
2815 -------------------------
2817 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
2818 P_Ref : constant Node_Id :=
2819 New_Reference_To (Defining_Entity (P), Loc);
2820 P_Spec : Node_Id := P;
2823 -- Ancestor may have been rewritten as a package body. Retrieve
2824 -- the original spec to trace earlier ancestors.
2826 if Nkind (P) = N_Package_Body
2827 and then Nkind (Original_Node (P)) = N_Package_Instantiation
2829 P_Spec := Original_Node (P);
2832 if No (Parent_Spec (P_Spec)) then
2836 Make_Selected_Component (Loc,
2837 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
2838 Selector_Name => P_Ref);
2840 end Build_Ancestor_Name;
2842 ---------------------
2843 -- Build_Unit_Name --
2844 ---------------------
2846 function Build_Unit_Name return Node_Id is
2849 if No (Parent_Spec (P_Unit)) then
2850 return New_Reference_To (P_Name, Loc);
2853 Make_Expanded_Name (Loc,
2854 Chars => Chars (P_Name),
2855 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
2856 Selector_Name => New_Reference_To (P_Name, Loc));
2857 Set_Entity (Result, P_Name);
2860 end Build_Unit_Name;
2862 -- Start of processing for Implicit_With_On_Parent
2865 -- The unit of the current compilation may be a package body that
2866 -- replaces an instance node. In this case we need the original instance
2867 -- node to construct the proper parent name.
2869 if Nkind (P_Unit) = N_Package_Body
2870 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
2872 P_Unit := Original_Node (P_Unit);
2875 -- We add the implicit with if the child unit is the current unit being
2876 -- compiled. If the current unit is a body, we do not want to add an
2877 -- implicit_with a second time to the corresponding spec.
2879 if Nkind (Child_Unit) = N_Package_Declaration
2880 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
2885 New_Nodes_OK := New_Nodes_OK + 1;
2886 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
2888 Set_Library_Unit (Withn, P);
2889 Set_Corresponding_Spec (Withn, P_Name);
2890 Set_First_Name (Withn, True);
2891 Set_Implicit_With (Withn, True);
2893 -- Node is placed at the beginning of the context items, so that
2894 -- subsequent use clauses on the parent can be validated.
2896 Prepend (Withn, Context_Items (N));
2897 Mark_Rewrite_Insertion (Withn);
2898 Install_Withed_Unit (Withn);
2900 if Is_Child_Spec (P_Unit) then
2901 Implicit_With_On_Parent (P_Unit, N);
2904 New_Nodes_OK := New_Nodes_OK - 1;
2905 end Implicit_With_On_Parent;
2911 function In_Chain (E : Entity_Id) return Boolean is
2915 H := Current_Entity (E);
2916 while Present (H) loop
2927 ---------------------
2928 -- Install_Context --
2929 ---------------------
2931 procedure Install_Context (N : Node_Id) is
2932 Lib_Unit : constant Node_Id := Unit (N);
2935 Install_Context_Clauses (N);
2937 if Is_Child_Spec (Lib_Unit) then
2938 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
2941 Install_Limited_Context_Clauses (N);
2942 end Install_Context;
2944 -----------------------------
2945 -- Install_Context_Clauses --
2946 -----------------------------
2948 procedure Install_Context_Clauses (N : Node_Id) is
2949 Lib_Unit : constant Node_Id := Unit (N);
2951 Uname_Node : Entity_Id;
2952 Check_Private : Boolean := False;
2953 Decl_Node : Node_Id;
2954 Lib_Parent : Entity_Id;
2957 -- First skip configuration pragmas at the start of the context. They
2958 -- are not technically part of the context clause, but that's where the
2959 -- parser puts them. Note they were analyzed in Analyze_Context.
2961 Item := First (Context_Items (N));
2962 while Present (Item)
2963 and then Nkind (Item) = N_Pragma
2964 and then Pragma_Name (Item) in Configuration_Pragma_Names
2969 -- Loop through the actual context clause items. We process everything
2970 -- except Limited_With clauses in this routine. Limited_With clauses
2971 -- are separately installed (see Install_Limited_Context_Clauses).
2973 while Present (Item) loop
2975 -- Case of explicit WITH clause
2977 if Nkind (Item) = N_With_Clause
2978 and then not Implicit_With (Item)
2980 if Limited_Present (Item) then
2982 -- Limited withed units will be installed later
2986 -- If Name (Item) is not an entity name, something is wrong, and
2987 -- this will be detected in due course, for now ignore the item
2989 elsif not Is_Entity_Name (Name (Item)) then
2992 elsif No (Entity (Name (Item))) then
2993 Set_Entity (Name (Item), Any_Id);
2997 Uname_Node := Entity (Name (Item));
2999 if Is_Private_Descendant (Uname_Node) then
3000 Check_Private := True;
3003 Install_Withed_Unit (Item);
3005 Decl_Node := Unit_Declaration_Node (Uname_Node);
3007 -- If the unit is a subprogram instance, it appears nested within
3008 -- a package that carries the parent information.
3010 if Is_Generic_Instance (Uname_Node)
3011 and then Ekind (Uname_Node) /= E_Package
3013 Decl_Node := Parent (Parent (Decl_Node));
3016 if Is_Child_Spec (Decl_Node) then
3017 if Nkind (Name (Item)) = N_Expanded_Name then
3018 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3020 -- If not an expanded name, the child unit must be a
3021 -- renaming, nothing to do.
3026 elsif Nkind (Decl_Node) = N_Subprogram_Body
3027 and then not Acts_As_Spec (Parent (Decl_Node))
3028 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3030 Implicit_With_On_Parent
3031 (Unit (Library_Unit (Parent (Decl_Node))), N);
3034 -- Check license conditions unless this is a dummy unit
3036 if Sloc (Library_Unit (Item)) /= No_Location then
3037 License_Check : declare
3039 Withu : constant Unit_Number_Type :=
3040 Get_Source_Unit (Library_Unit (Item));
3042 Withl : constant License_Type :=
3043 License (Source_Index (Withu));
3045 Unitl : constant License_Type :=
3046 License (Source_Index (Current_Sem_Unit));
3048 procedure License_Error;
3049 -- Signal error of bad license
3055 procedure License_Error is
3058 ("?license of with'ed unit & may be inconsistent",
3062 -- Start of processing for License_Check
3065 -- Exclude license check if withed unit is an internal unit.
3066 -- This situation arises e.g. with the GPL version of GNAT.
3068 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3071 -- Otherwise check various cases
3083 if Withl = Restricted then
3087 when Modified_GPL =>
3088 if Withl = Restricted or else Withl = GPL then
3092 when Unrestricted =>
3099 -- Case of USE PACKAGE clause
3101 elsif Nkind (Item) = N_Use_Package_Clause then
3102 Analyze_Use_Package (Item);
3104 -- Case of USE TYPE clause
3106 elsif Nkind (Item) = N_Use_Type_Clause then
3107 Analyze_Use_Type (Item);
3111 elsif Nkind (Item) = N_Pragma then
3119 if Is_Child_Spec (Lib_Unit) then
3121 -- The unit also has implicit with_clauses on its own parents
3123 if No (Context_Items (N)) then
3124 Set_Context_Items (N, New_List);
3127 Implicit_With_On_Parent (Lib_Unit, N);
3130 -- If the unit is a body, the context of the specification must also
3133 if Nkind (Lib_Unit) = N_Package_Body
3134 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3135 and then not Acts_As_Spec (N))
3137 Install_Context (Library_Unit (N));
3139 if Is_Child_Spec (Unit (Library_Unit (N))) then
3141 -- If the unit is the body of a public child unit, the private
3142 -- declarations of the parent must be made visible. If the child
3143 -- unit is private, the private declarations have been installed
3144 -- already in the call to Install_Parents for the spec. Installing
3145 -- private declarations must be done for all ancestors of public
3146 -- child units. In addition, sibling units mentioned in the
3147 -- context clause of the body are directly visible.
3155 Lib_Spec := Unit (Library_Unit (N));
3156 while Is_Child_Spec (Lib_Spec) loop
3157 P := Unit (Parent_Spec (Lib_Spec));
3158 P_Name := Defining_Entity (P);
3160 if not (Private_Present (Parent (Lib_Spec)))
3161 and then not In_Private_Part (P_Name)
3163 Install_Private_Declarations (P_Name);
3164 Install_Private_With_Clauses (P_Name);
3165 Set_Use (Private_Declarations (Specification (P)));
3173 -- For a package body, children in context are immediately visible
3175 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3178 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3179 N_Generic_Subprogram_Declaration,
3180 N_Package_Declaration,
3181 N_Subprogram_Declaration)
3183 if Is_Child_Spec (Lib_Unit) then
3184 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3185 Set_Is_Private_Descendant
3186 (Defining_Entity (Lib_Unit),
3187 Is_Private_Descendant (Lib_Parent)
3188 or else Private_Present (Parent (Lib_Unit)));
3191 Set_Is_Private_Descendant
3192 (Defining_Entity (Lib_Unit),
3193 Private_Present (Parent (Lib_Unit)));
3197 if Check_Private then
3198 Check_Private_Child_Unit (N);
3200 end Install_Context_Clauses;
3202 -------------------------------------
3203 -- Install_Limited_Context_Clauses --
3204 -------------------------------------
3206 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3209 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3210 -- Check that the unlimited view of a given compilation_unit is not
3211 -- already visible through "use + renamings".
3213 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3214 -- Check that if a limited_with clause of a given compilation_unit
3215 -- mentions a descendant of a private child of some library unit,
3216 -- then the given compilation_unit shall be the declaration of a
3217 -- private descendant of that library unit, or a public descendant
3218 -- of such. The code is analogous to that of Check_Private_Child_Unit
3219 -- but we cannot use entities on the limited with_clauses because
3220 -- their units have not been analyzed, so we have to climb the tree
3221 -- of ancestors looking for private keywords.
3223 procedure Expand_Limited_With_Clause
3224 (Comp_Unit : Node_Id;
3227 -- If a child unit appears in a limited_with clause, there are implicit
3228 -- limited_with clauses on all parents that are not already visible
3229 -- through a regular with clause. This procedure creates the implicit
3230 -- limited with_clauses for the parents and loads the corresponding
3231 -- units. The shadow entities are created when the inserted clause is
3232 -- analyzed. Implements Ada 2005 (AI-50217).
3234 ---------------------
3235 -- Check_Renamings --
3236 ---------------------
3238 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3247 pragma Assert (Nkind (W) = N_With_Clause);
3249 -- Protect the frontend against previous critical errors
3251 case Nkind (Unit (Library_Unit (W))) is
3252 when N_Subprogram_Declaration |
3253 N_Package_Declaration |
3254 N_Generic_Subprogram_Declaration |
3255 N_Generic_Package_Declaration =>
3262 -- Check "use + renamings"
3264 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3265 Spec := Specification (Unit (P));
3267 Item := First (Visible_Declarations (Spec));
3268 while Present (Item) loop
3270 -- Look only at use package clauses
3272 if Nkind (Item) = N_Use_Package_Clause then
3274 -- Traverse the list of packages
3276 Nam := First (Names (Item));
3277 while Present (Nam) loop
3280 pragma Assert (Present (Parent (E)));
3282 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3283 and then Renamed_Entity (E) = WEnt
3285 -- The unlimited view is visible through use clause and
3286 -- renamings. There is no need to generate the error
3287 -- message here because Is_Visible_Through_Renamings
3288 -- takes care of generating the precise error message.
3292 elsif Nkind (Parent (E)) = N_Package_Specification then
3294 -- The use clause may refer to a local package.
3295 -- Check all the enclosing scopes.
3298 while E2 /= Standard_Standard
3306 ("unlimited view visible through use clause ", W);
3318 -- Recursive call to check all the ancestors
3320 if Is_Child_Spec (Unit (P)) then
3321 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3323 end Check_Renamings;
3325 ---------------------------------------
3326 -- Check_Private_Limited_Withed_Unit --
3327 ---------------------------------------
3329 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3330 Curr_Parent : Node_Id;
3331 Child_Parent : Node_Id;
3332 Curr_Private : Boolean;
3335 -- Compilation unit of the parent of the withed library unit
3337 Child_Parent := Library_Unit (Item);
3339 -- If the child unit is a public child, then locate its nearest
3340 -- private ancestor, if any; Child_Parent will then be set to
3341 -- the parent of that ancestor.
3343 if not Private_Present (Library_Unit (Item)) then
3344 while Present (Child_Parent)
3345 and then not Private_Present (Child_Parent)
3347 Child_Parent := Parent_Spec (Unit (Child_Parent));
3350 if No (Child_Parent) then
3355 Child_Parent := Parent_Spec (Unit (Child_Parent));
3357 -- Traverse all the ancestors of the current compilation
3358 -- unit to check if it is a descendant of named library unit.
3360 Curr_Parent := Parent (Item);
3361 Curr_Private := Private_Present (Curr_Parent);
3363 while Present (Parent_Spec (Unit (Curr_Parent)))
3364 and then Curr_Parent /= Child_Parent
3366 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3367 Curr_Private := Curr_Private or else Private_Present (Curr_Parent);
3370 if Curr_Parent /= Child_Parent then
3372 ("unit in with clause is private child unit!", Item);
3374 ("\current unit must also have parent&!",
3375 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3377 elsif Private_Present (Parent (Item))
3378 or else Curr_Private
3379 or else Private_Present (Item)
3380 or else Nkind_In (Unit (Parent (Item)), N_Package_Body,
3384 -- Current unit is private, of descendant of a private unit
3390 ("current unit must also be private descendant of&",
3391 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3393 end Check_Private_Limited_Withed_Unit;
3395 --------------------------------
3396 -- Expand_Limited_With_Clause --
3397 --------------------------------
3399 procedure Expand_Limited_With_Clause
3400 (Comp_Unit : Node_Id;
3404 Loc : constant Source_Ptr := Sloc (Nam);
3405 Unum : Unit_Number_Type;
3408 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3409 -- Returns true if the context already includes a with_clause for
3410 -- this unit. If the with_clause is non-limited, the unit is fully
3411 -- visible and an implicit limited_with should not be created. If
3412 -- there is already a limited_with clause for W, a second one is
3413 -- simply redundant.
3415 --------------------------
3416 -- Previous_Withed_Unit --
3417 --------------------------
3419 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3423 -- A limited with_clause cannot appear in the same context_clause
3424 -- as a nonlimited with_clause which mentions the same library.
3426 Item := First (Context_Items (Comp_Unit));
3427 while Present (Item) loop
3428 if Nkind (Item) = N_With_Clause
3429 and then Library_Unit (Item) = Library_Unit (W)
3438 end Previous_Withed_Unit;
3440 -- Start of processing for Expand_Limited_With_Clause
3443 New_Nodes_OK := New_Nodes_OK + 1;
3445 if Nkind (Nam) = N_Identifier then
3447 -- Create node for name of withed unit
3450 Make_With_Clause (Loc,
3451 Name => New_Copy (Nam));
3453 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3455 Make_With_Clause (Loc,
3456 Name => Make_Selected_Component (Loc,
3457 Prefix => New_Copy_Tree (Prefix (Nam)),
3458 Selector_Name => New_Copy (Selector_Name (Nam))));
3459 Set_Parent (Withn, Parent (N));
3462 Set_Limited_Present (Withn);
3463 Set_First_Name (Withn);
3464 Set_Implicit_With (Withn);
3468 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3473 -- Do not generate a limited_with_clause on the current unit.
3474 -- This path is taken when a unit has a limited_with clause on
3475 -- one of its child units.
3477 if Unum = Current_Sem_Unit then
3481 Set_Library_Unit (Withn, Cunit (Unum));
3482 Set_Corresponding_Spec
3483 (Withn, Specification (Unit (Cunit (Unum))));
3485 if not Previous_Withed_Unit (Withn) then
3486 Prepend (Withn, Context_Items (Parent (N)));
3487 Mark_Rewrite_Insertion (Withn);
3489 -- Add implicit limited_with_clauses for parents of child units
3490 -- mentioned in limited_with clauses.
3492 if Nkind (Nam) = N_Selected_Component then
3493 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3498 if not Limited_View_Installed (Withn) then
3499 Install_Limited_Withed_Unit (Withn);
3503 New_Nodes_OK := New_Nodes_OK - 1;
3504 end Expand_Limited_With_Clause;
3506 -- Start of processing for Install_Limited_Context_Clauses
3509 Item := First (Context_Items (N));
3510 while Present (Item) loop
3511 if Nkind (Item) = N_With_Clause
3512 and then Limited_Present (Item)
3514 if Nkind (Name (Item)) = N_Selected_Component then
3515 Expand_Limited_With_Clause
3516 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3519 Check_Private_Limited_Withed_Unit (Item);
3521 if not Implicit_With (Item)
3522 and then Is_Child_Spec (Unit (N))
3524 Check_Renamings (Parent_Spec (Unit (N)), Item);
3527 -- A unit may have a limited with on itself if it has a limited
3528 -- with_clause on one of its child units. In that case it is
3529 -- already being compiled and it makes no sense to install its
3532 -- If the item is a limited_private_with_clause, install it if the
3533 -- current unit is a body or if it is a private child. Otherwise
3534 -- the private clause is installed before analyzing the private
3535 -- part of the current unit.
3537 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3538 and then not Limited_View_Installed (Item)
3540 if not Private_Present (Item)
3541 or else Private_Present (N)
3542 or else Nkind_In (Unit (N), N_Package_Body,
3546 Install_Limited_Withed_Unit (Item);
3550 -- All items other than Limited_With clauses are ignored (they were
3551 -- installed separately early on by Install_Context_Clause).
3560 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3561 -- spec, looking for incomplete subtype declarations of incomplete
3562 -- types visible through a limited with clause.
3564 if Ada_Version >= Ada_05
3565 and then Analyzed (N)
3566 and then Nkind (Unit (N)) = N_Package_Declaration
3571 Non_Lim_View : Entity_Id;
3574 Decl := First (Visible_Declarations (Specification (Unit (N))));
3575 while Present (Decl) loop
3576 if Nkind (Decl) = N_Subtype_Declaration
3578 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3580 From_With_Type (Defining_Identifier (Decl))
3582 Def_Id := Defining_Identifier (Decl);
3583 Non_Lim_View := Non_Limited_View (Def_Id);
3585 if not Is_Incomplete_Type (Non_Lim_View) then
3587 -- Convert an incomplete subtype declaration into a
3588 -- corresponding non-limited view subtype declaration.
3589 -- This is usually the case when analyzing a body that
3590 -- has regular with-clauses, when the spec has limited
3593 -- If the non-limited view is still incomplete, it is
3594 -- the dummy entry already created, and the declaration
3595 -- cannot be reanalyzed. This is the case when installing
3596 -- a parent unit that has limited with-clauses.
3598 Set_Subtype_Indication (Decl,
3599 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3600 Set_Etype (Def_Id, Non_Lim_View);
3601 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3602 Set_Analyzed (Decl, False);
3604 -- Reanalyze the declaration, suppressing the call to
3605 -- Enter_Name to avoid duplicate names.
3607 Analyze_Subtype_Declaration
3617 end Install_Limited_Context_Clauses;
3619 ---------------------
3620 -- Install_Parents --
3621 ---------------------
3623 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3630 P := Unit (Parent_Spec (Lib_Unit));
3631 P_Name := Get_Parent_Entity (P);
3633 if Etype (P_Name) = Any_Type then
3637 if Ekind (P_Name) = E_Generic_Package
3638 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3639 N_Generic_Package_Declaration)
3640 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3643 ("child of a generic package must be a generic unit", Lib_Unit);
3645 elsif not Is_Package_Or_Generic_Package (P_Name) then
3647 ("parent unit must be package or generic package", Lib_Unit);
3648 raise Unrecoverable_Error;
3650 elsif Present (Renamed_Object (P_Name)) then
3651 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3652 raise Unrecoverable_Error;
3654 -- Verify that a child of an instance is itself an instance, or the
3655 -- renaming of one. Given that an instance that is a unit is replaced
3656 -- with a package declaration, check against the original node. The
3657 -- parent may be currently being instantiated, in which case it appears
3658 -- as a declaration, but the generic_parent is already established
3659 -- indicating that we deal with an instance.
3661 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3662 if Nkind (Lib_Unit) in N_Renaming_Declaration
3663 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3665 (Nkind (Lib_Unit) = N_Package_Declaration
3666 and then Present (Generic_Parent (Specification (Lib_Unit))))
3671 ("child of an instance must be an instance or renaming",
3676 -- This is the recursive call that ensures all parents are loaded
3678 if Is_Child_Spec (P) then
3680 Is_Private or else Private_Present (Parent (Lib_Unit)));
3683 -- Now we can install the context for this parent
3685 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3686 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3687 Install_Siblings (P_Name, Parent (Lib_Unit));
3689 -- The child unit is in the declarative region of the parent. The parent
3690 -- must therefore appear in the scope stack and be visible, as when
3691 -- compiling the corresponding body. If the child unit is private or it
3692 -- is a package body, private declarations must be accessible as well.
3693 -- Use declarations in the parent must also be installed. Finally, other
3694 -- child units of the same parent that are in the context are
3695 -- immediately visible.
3697 -- Find entity for compilation unit, and set its private descendant
3698 -- status as needed.
3700 E_Name := Defining_Entity (Lib_Unit);
3702 Set_Is_Child_Unit (E_Name);
3704 Set_Is_Private_Descendant (E_Name,
3705 Is_Private_Descendant (P_Name)
3706 or else Private_Present (Parent (Lib_Unit)));
3708 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3709 Push_Scope (P_Name);
3711 -- Save current visibility of unit
3713 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3714 Is_Immediately_Visible (P_Name);
3715 Set_Is_Immediately_Visible (P_Name);
3716 Install_Visible_Declarations (P_Name);
3717 Set_Use (Visible_Declarations (P_Spec));
3719 -- If the parent is a generic unit, its formal part may contain formal
3720 -- packages and use clauses for them.
3722 if Ekind (P_Name) = E_Generic_Package then
3723 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3727 or else Private_Present (Parent (Lib_Unit))
3729 Install_Private_Declarations (P_Name);
3730 Install_Private_With_Clauses (P_Name);
3731 Set_Use (Private_Declarations (P_Spec));
3733 end Install_Parents;
3735 ----------------------------------
3736 -- Install_Private_With_Clauses --
3737 ----------------------------------
3739 procedure Install_Private_With_Clauses (P : Entity_Id) is
3740 Decl : constant Node_Id := Unit_Declaration_Node (P);
3744 if Debug_Flag_I then
3745 Write_Str ("install private with clauses of ");
3746 Write_Name (Chars (P));
3750 if Nkind (Parent (Decl)) = N_Compilation_Unit then
3751 Item := First (Context_Items (Parent (Decl)));
3752 while Present (Item) loop
3753 if Nkind (Item) = N_With_Clause
3754 and then Private_Present (Item)
3756 if Limited_Present (Item) then
3757 if not Limited_View_Installed (Item) then
3758 Install_Limited_Withed_Unit (Item);
3761 Install_Withed_Unit (Item, Private_With_OK => True);
3768 end Install_Private_With_Clauses;
3770 ----------------------
3771 -- Install_Siblings --
3772 ----------------------
3774 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
3780 -- Iterate over explicit with clauses, and check whether the scope of
3781 -- each entity is an ancestor of the current unit, in which case it is
3782 -- immediately visible.
3784 Item := First (Context_Items (N));
3785 while Present (Item) loop
3787 -- Do not install private_with_clauses declaration, unless
3788 -- unit is itself a private child unit, or is a body.
3789 -- Note that for a subprogram body the private_with_clause does
3790 -- not take effect until after the specification.
3792 if Nkind (Item) /= N_With_Clause
3793 or else Implicit_With (Item)
3794 or else Limited_Present (Item)
3798 elsif not Private_Present (Item)
3799 or else Private_Present (N)
3800 or else Nkind (Unit (N)) = N_Package_Body
3802 Id := Entity (Name (Item));
3804 if Is_Child_Unit (Id)
3805 and then Is_Ancestor_Package (Scope (Id), U_Name)
3807 Set_Is_Immediately_Visible (Id);
3809 -- Check for the presence of another unit in the context,
3810 -- that may be inadvertently hidden by the child.
3812 Prev := Current_Entity (Id);
3815 and then Is_Immediately_Visible (Prev)
3816 and then not Is_Child_Unit (Prev)
3822 Clause := First (Context_Items (N));
3823 while Present (Clause) loop
3824 if Nkind (Clause) = N_With_Clause
3825 and then Entity (Name (Clause)) = Prev
3828 ("child unit& hides compilation unit " &
3829 "with the same name?",
3839 -- The With_Clause may be on a grand-child or one of its further
3840 -- descendants, which makes a child immediately visible. Examine
3841 -- ancestry to determine whether such a child exists. For example,
3842 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
3843 -- is immediately visible.
3845 elsif Is_Child_Unit (Id) then
3851 while Is_Child_Unit (Par) loop
3852 if Is_Ancestor_Package (Scope (Par), U_Name) then
3853 Set_Is_Immediately_Visible (Par);
3862 -- If the item is a private with-clause on a child unit, the parent
3863 -- may have been installed already, but the child unit must remain
3864 -- invisible until installed in a private part or body.
3866 elsif Private_Present (Item) then
3867 Id := Entity (Name (Item));
3869 if Is_Child_Unit (Id) then
3870 Set_Is_Visible_Child_Unit (Id, False);
3876 end Install_Siblings;
3878 ---------------------------------
3879 -- Install_Limited_Withed_Unit --
3880 ---------------------------------
3882 procedure Install_Limited_Withed_Unit (N : Node_Id) is
3883 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
3886 Is_Child_Package : Boolean := False;
3887 Lim_Header : Entity_Id;
3888 Lim_Typ : Entity_Id;
3890 procedure Check_Body_Required;
3891 -- A unit mentioned in a limited with_clause may not be mentioned in
3892 -- a regular with_clause, but must still be included in the current
3893 -- partition. We need to determine whether the unit needs a body, so
3894 -- that the binder can determine the name of the file to be compiled.
3895 -- Checking whether a unit needs a body can be done without semantic
3896 -- analysis, by examining the nature of the declarations in the package.
3898 function Has_Limited_With_Clause
3899 (C_Unit : Entity_Id;
3900 Pack : Entity_Id) return Boolean;
3901 -- Determine whether any package in the ancestor chain starting with
3902 -- C_Unit has a limited with clause for package Pack.
3904 function Has_With_Clause
3907 Is_Limited : Boolean := False) return Boolean;
3908 -- Determine whether compilation unit C_Unit contains a with clause
3909 -- for package Pack. Use flag Is_Limited to designate desired clause
3910 -- kind. This is a subsidiary routine to Has_Limited_With_Clause.
3912 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
3913 -- Check if some package installed though normal with-clauses has a
3914 -- renaming declaration of package P. AARM 10.1.2(21/2).
3916 -------------------------
3917 -- Check_Body_Required --
3918 -------------------------
3920 procedure Check_Body_Required is
3921 PA : constant List_Id :=
3922 Pragmas_After (Aux_Decls_Node (Parent (P_Unit)));
3924 procedure Check_Declarations (Spec : Node_Id);
3925 -- Recursive procedure that does the work and checks nested packages
3927 ------------------------
3928 -- Check_Declarations --
3929 ------------------------
3931 procedure Check_Declarations (Spec : Node_Id) is
3933 Incomplete_Decls : constant Elist_Id := New_Elmt_List;
3935 Subp_List : constant Elist_Id := New_Elmt_List;
3937 procedure Check_Pragma_Import (P : Node_Id);
3938 -- If a pragma import applies to a previous subprogram, the
3939 -- enclosing unit may not need a body. The processing is syntactic
3940 -- and does not require a declaration to be analyzed. The code
3941 -- below also handles pragma Import when applied to a subprogram
3942 -- that renames another. In this case the pragma applies to the
3945 -- Chains of multiple renames are not handled by the code below.
3946 -- It is probably impossible to handle all cases without proper
3947 -- name resolution. In such cases the algorithm is conservative
3948 -- and will indicate that a body is needed???
3950 -------------------------
3951 -- Check_Pragma_Import --
3952 -------------------------
3954 procedure Check_Pragma_Import (P : Node_Id) is
3960 procedure Remove_Homonyms (E : Node_Id);
3961 -- Make one pass over list of subprograms. Called again if
3962 -- subprogram is a renaming. E is known to be an identifier.
3964 ---------------------
3965 -- Remove_Homonyms --
3966 ---------------------
3968 procedure Remove_Homonyms (E : Node_Id) is
3969 R : Entity_Id := Empty;
3970 -- Name of renamed entity, if any
3973 Subp_Id := First_Elmt (Subp_List);
3974 while Present (Subp_Id) loop
3975 if Chars (Node (Subp_Id)) = Chars (E) then
3976 if Nkind (Parent (Parent (Node (Subp_Id))))
3977 /= N_Subprogram_Renaming_Declaration
3980 Next_Elmt (Subp_Id);
3981 Remove_Elmt (Subp_List, Prev_Id);
3983 R := Name (Parent (Parent (Node (Subp_Id))));
3987 Next_Elmt (Subp_Id);
3992 if Nkind (R) = N_Identifier then
3993 Remove_Homonyms (R);
3995 elsif Nkind (R) = N_Selected_Component then
3996 Remove_Homonyms (Selector_Name (R));
3998 -- Renaming of attribute
4004 end Remove_Homonyms;
4006 -- Start of processing for Check_Pragma_Import
4009 -- Find name of entity in Import pragma. We have not analyzed
4010 -- the construct, so we must guard against syntax errors.
4012 Arg := Next (First (Pragma_Argument_Associations (P)));
4015 or else Nkind (Expression (Arg)) /= N_Identifier
4019 Imported := Expression (Arg);
4022 Remove_Homonyms (Imported);
4023 end Check_Pragma_Import;
4025 -- Start of processing for Check_Declarations
4028 -- Search for Elaborate Body pragma
4030 Decl := First (Visible_Declarations (Spec));
4031 while Present (Decl)
4032 and then Nkind (Decl) = N_Pragma
4034 if Get_Pragma_Id (Decl) = Pragma_Elaborate_Body then
4035 Set_Body_Required (Library_Unit (N));
4042 -- Look for declarations that require the presence of a body
4044 while Present (Decl) loop
4046 -- Subprogram that comes from source means body may be needed.
4047 -- Save for subsequent examination of import pragmas.
4049 if Comes_From_Source (Decl)
4050 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4051 N_Subprogram_Renaming_Declaration,
4052 N_Generic_Subprogram_Declaration))
4054 Append_Elmt (Defining_Entity (Decl), Subp_List);
4056 -- Package declaration of generic package declaration. We need
4057 -- to recursively examine nested declarations.
4059 elsif Nkind_In (Decl, N_Package_Declaration,
4060 N_Generic_Package_Declaration)
4062 Check_Declarations (Specification (Decl));
4064 elsif Nkind (Decl) = N_Pragma
4065 and then Pragma_Name (Decl) = Name_Import
4067 Check_Pragma_Import (Decl);
4073 -- Same set of tests for private part. In addition to subprograms
4074 -- detect the presence of Taft Amendment types (incomplete types
4075 -- completed in the body).
4077 Decl := First (Private_Declarations (Spec));
4078 while Present (Decl) loop
4079 if Comes_From_Source (Decl)
4080 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4081 N_Subprogram_Renaming_Declaration,
4082 N_Generic_Subprogram_Declaration))
4084 Append_Elmt (Defining_Entity (Decl), Subp_List);
4086 elsif Nkind_In (Decl, N_Package_Declaration,
4087 N_Generic_Package_Declaration)
4089 Check_Declarations (Specification (Decl));
4091 -- Collect incomplete type declarations for separate pass
4093 elsif Nkind (Decl) = N_Incomplete_Type_Declaration then
4094 Append_Elmt (Decl, Incomplete_Decls);
4096 elsif Nkind (Decl) = N_Pragma
4097 and then Pragma_Name (Decl) = Name_Import
4099 Check_Pragma_Import (Decl);
4105 -- Now check incomplete declarations to locate Taft amendment
4106 -- types. This can be done by examining the defining identifiers
4107 -- of type declarations without real semantic analysis.
4113 Inc := First_Elmt (Incomplete_Decls);
4114 while Present (Inc) loop
4115 Decl := Next (Node (Inc));
4116 while Present (Decl) loop
4117 if Nkind (Decl) = N_Full_Type_Declaration
4118 and then Chars (Defining_Identifier (Decl)) =
4119 Chars (Defining_Identifier (Node (Inc)))
4127 -- If no completion, this is a TAT, and a body is needed
4130 Set_Body_Required (Library_Unit (N));
4138 -- Finally, check whether there are subprograms that still
4141 if not Is_Empty_Elmt_List (Subp_List) then
4146 Subp_Id := First_Elmt (Subp_List);
4148 while Present (Subp_Id) loop
4149 if Nkind (Parent (Parent (Node (Subp_Id))))
4150 /= N_Subprogram_Renaming_Declaration
4152 Set_Body_Required (Library_Unit (N));
4156 Next_Elmt (Subp_Id);
4160 end Check_Declarations;
4162 -- Start of processing for Check_Body_Required
4165 -- If this is an imported package (Java and CIL usage) no body is
4166 -- needed. Scan list of pragmas that may follow a compilation unit
4167 -- to look for a relevant pragma Import.
4169 if Present (PA) then
4175 while Present (Prag) loop
4176 if Nkind (Prag) = N_Pragma
4177 and then Get_Pragma_Id (Prag) = Pragma_Import
4187 Check_Declarations (Specification (P_Unit));
4188 end Check_Body_Required;
4190 -----------------------------
4191 -- Has_Limited_With_Clause --
4192 -----------------------------
4194 function Has_Limited_With_Clause
4195 (C_Unit : Entity_Id;
4196 Pack : Entity_Id) return Boolean
4203 while Present (Par) loop
4204 if Ekind (Par) /= E_Package then
4208 -- Retrieve the Compilation_Unit node for Par and determine if
4209 -- its context clauses contain a limited with for Pack.
4211 Par_Unit := Parent (Parent (Parent (Par)));
4213 if Nkind (Par_Unit) = N_Package_Declaration then
4214 Par_Unit := Parent (Par_Unit);
4217 if Has_With_Clause (Par_Unit, Pack, True) then
4221 -- If there are more ancestors, climb up the tree, otherwise
4224 if Is_Child_Unit (Par) then
4232 end Has_Limited_With_Clause;
4234 ---------------------
4235 -- Has_With_Clause --
4236 ---------------------
4238 function Has_With_Clause
4241 Is_Limited : Boolean := False) return Boolean
4247 if Present (Context_Items (C_Unit)) then
4248 Item := First (Context_Items (C_Unit));
4249 while Present (Item) loop
4250 if Nkind (Item) = N_With_Clause then
4252 -- Retrieve the entity of the imported compilation unit
4254 if Nkind (Name (Item)) = N_Selected_Component then
4255 Nam := Entity (Selector_Name (Name (Item)));
4257 Nam := Entity (Name (Item));
4262 ((Is_Limited and then Limited_Present (Item))
4264 (not Is_Limited and then not Limited_Present (Item)))
4275 end Has_With_Clause;
4277 ----------------------------------
4278 -- Is_Visible_Through_Renamings --
4279 ----------------------------------
4281 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4282 Kind : constant Node_Kind :=
4283 Nkind (Unit (Cunit (Current_Sem_Unit)));
4289 -- Example of the error detected by this subprogram:
4297 -- package Ren_P renames P;
4303 -- limited with P; -- ERROR
4304 -- package R.C is ...
4306 Aux_Unit := Cunit (Current_Sem_Unit);
4309 Item := First (Context_Items (Aux_Unit));
4310 while Present (Item) loop
4311 if Nkind (Item) = N_With_Clause
4312 and then not Limited_Present (Item)
4313 and then Nkind (Unit (Library_Unit (Item))) =
4314 N_Package_Declaration
4317 First (Visible_Declarations
4318 (Specification (Unit (Library_Unit (Item)))));
4319 while Present (Decl) loop
4320 if Nkind (Decl) = N_Package_Renaming_Declaration
4321 and then Entity (Name (Decl)) = P
4323 -- Generate the error message only if the current unit
4324 -- is a package declaration; in case of subprogram
4325 -- bodies and package bodies we just return True to
4326 -- indicate that the limited view must not be
4329 if Kind = N_Package_Declaration then
4331 ("simultaneous visibility of the limited and " &
4332 "unlimited views not allowed", N);
4333 Error_Msg_Sloc := Sloc (Item);
4335 ("\\ unlimited view of & visible through the " &
4336 "context clause #", N, P);
4337 Error_Msg_Sloc := Sloc (Decl);
4338 Error_Msg_NE ("\\ and the renaming #", N, P);
4351 -- If it's a body not acting as spec, follow pointer to
4352 -- corresponding spec, otherwise follow pointer to parent spec.
4354 if Present (Library_Unit (Aux_Unit))
4355 and then Nkind_In (Unit (Aux_Unit),
4356 N_Package_Body, N_Subprogram_Body)
4358 if Aux_Unit = Library_Unit (Aux_Unit) then
4360 -- Aux_Unit is a body that acts as a spec. Clause has
4361 -- already been flagged as illegal.
4366 Aux_Unit := Library_Unit (Aux_Unit);
4370 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4373 exit when No (Aux_Unit);
4377 end Is_Visible_Through_Renamings;
4379 -- Start of processing for Install_Limited_Withed_Unit
4382 pragma Assert (not Limited_View_Installed (N));
4384 -- In case of limited with_clause on subprograms, generics, instances,
4385 -- or renamings, the corresponding error was previously posted and we
4386 -- have nothing to do here. If the file is missing altogether, it has
4387 -- no source location.
4389 if Nkind (P_Unit) /= N_Package_Declaration
4390 or else Sloc (P_Unit) = No_Location
4395 P := Defining_Unit_Name (Specification (P_Unit));
4397 -- Handle child packages
4399 if Nkind (P) = N_Defining_Program_Unit_Name then
4400 Is_Child_Package := True;
4401 P := Defining_Identifier (P);
4404 -- Do not install the limited-view if the full-view is already visible
4405 -- through renaming declarations.
4407 if Is_Visible_Through_Renamings (P) then
4411 -- Do not install the limited view if this is the unit being analyzed.
4412 -- This unusual case will happen when a unit has a limited_with clause
4413 -- on one of its children. The compilation of the child forces the
4414 -- load of the parent which tries to install the limited view of the
4415 -- child again. Installing the limited view must also be disabled
4416 -- when compiling the body of the child unit.
4418 if P = Cunit_Entity (Current_Sem_Unit)
4420 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4421 and then P = Main_Unit_Entity)
4426 -- This scenario is similar to the one above, the difference is that
4427 -- the compilation of sibling Par.Sib forces the load of parent Par
4428 -- which tries to install the limited view of Lim_Pack [1]. However
4429 -- Par.Sib has a with clause for Lim_Pack [2] in its body, and thus
4430 -- needs the non-limited views of all entities from Lim_Pack.
4432 -- limited with Lim_Pack; -- [1]
4433 -- package Par is ... package Lim_Pack is ...
4435 -- with Lim_Pack; -- [2]
4436 -- package Par.Sib is ... package body Par.Sib is ...
4438 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4439 -- Sem_Unit is the body of Par.Sib.
4441 if Ekind (P) = E_Package
4442 and then Ekind (Main_Unit_Entity) = E_Package
4443 and then Is_Child_Unit (Main_Unit_Entity)
4445 -- The body has a regular with clause
4447 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4448 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4450 -- One of the ancestors has a limited with clause
4452 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4453 N_Package_Specification
4454 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4459 -- A common use of the limited-with is to have a limited-with
4460 -- in the package spec, and a normal with in its package body.
4463 -- limited with X; -- [1]
4467 -- package body A is ...
4469 -- The compilation of A's body installs the context clauses found at [2]
4470 -- and then the context clauses of its specification (found at [1]). As
4471 -- a consequence, at [1] the specification of X has been analyzed and it
4472 -- is immediately visible. According to the semantics of limited-with
4473 -- context clauses we don't install the limited view because the full
4474 -- view of X supersedes its limited view.
4476 if Analyzed (P_Unit)
4478 (Is_Immediately_Visible (P)
4480 (Is_Child_Package and then Is_Visible_Child_Unit (P)))
4485 if Debug_Flag_I then
4486 Write_Str ("install limited view of ");
4487 Write_Name (Chars (P));
4491 -- If the unit has not been analyzed and the limited view has not been
4492 -- already installed then we install it.
4494 if not Analyzed (P_Unit) then
4495 if not In_Chain (P) then
4497 -- Minimum decoration
4499 Set_Ekind (P, E_Package);
4500 Set_Etype (P, Standard_Void_Type);
4501 Set_Scope (P, Standard_Standard);
4503 if Is_Child_Package then
4504 Set_Is_Child_Unit (P);
4505 Set_Is_Visible_Child_Unit (P);
4506 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4509 -- Place entity on visibility structure
4511 Set_Homonym (P, Current_Entity (P));
4512 Set_Current_Entity (P);
4514 if Debug_Flag_I then
4515 Write_Str (" (homonym) chain ");
4516 Write_Name (Chars (P));
4520 -- Install the incomplete view. The first element of the limited
4521 -- view is a header (an E_Package entity) used to reference the
4522 -- first shadow entity in the private part of the package.
4524 Lim_Header := Limited_View (P);
4525 Lim_Typ := First_Entity (Lim_Header);
4527 while Present (Lim_Typ)
4528 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4530 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4531 Set_Current_Entity (Lim_Typ);
4533 if Debug_Flag_I then
4534 Write_Str (" (homonym) chain ");
4535 Write_Name (Chars (Lim_Typ));
4539 Next_Entity (Lim_Typ);
4543 -- If the unit appears in a previous regular with_clause, the regular
4544 -- entities of the public part of the withed package must be replaced
4545 -- by the shadow ones.
4547 -- This code must be kept synchronized with the code that replaces the
4548 -- shadow entities by the real entities (see body of Remove_Limited
4549 -- With_Clause); otherwise the contents of the homonym chains are not
4553 -- Hide all the type entities of the public part of the package to
4554 -- avoid its usage. This is needed to cover all the subtype decla-
4555 -- rations because we do not remove them from the homonym chain.
4557 E := First_Entity (P);
4558 while Present (E) and then E /= First_Private_Entity (P) loop
4560 Set_Was_Hidden (E, Is_Hidden (E));
4567 -- Replace the real entities by the shadow entities of the limited
4568 -- view. The first element of the limited view is a header that is
4569 -- used to reference the first shadow entity in the private part
4570 -- of the package. Successive elements are the limited views of the
4571 -- type (including regular incomplete types) declared in the package.
4573 Lim_Header := Limited_View (P);
4575 Lim_Typ := First_Entity (Lim_Header);
4576 while Present (Lim_Typ)
4577 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4579 pragma Assert (not In_Chain (Lim_Typ));
4581 -- Do not unchain nested packages and child units
4583 if Ekind (Lim_Typ) /= E_Package
4584 and then not Is_Child_Unit (Lim_Typ)
4590 Prev := Current_Entity (Lim_Typ);
4593 -- Replace E in the homonyms list, so that the limited
4594 -- view becomes available.
4596 if E = Non_Limited_View (Lim_Typ) then
4597 Set_Homonym (Lim_Typ, Homonym (Prev));
4598 Set_Current_Entity (Lim_Typ);
4602 E := Homonym (Prev);
4604 -- E may have been removed when installing a
4605 -- previous limited_with_clause.
4609 exit when E = Non_Limited_View (Lim_Typ);
4611 Prev := Homonym (Prev);
4615 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4616 Set_Homonym (Prev, Lim_Typ);
4621 if Debug_Flag_I then
4622 Write_Str (" (homonym) chain ");
4623 Write_Name (Chars (Lim_Typ));
4628 Next_Entity (Lim_Typ);
4632 -- The package must be visible while the limited-with clause is active
4633 -- because references to the type P.T must resolve in the usual way.
4634 -- In addition, we remember that the limited-view has been installed to
4635 -- uninstall it at the point of context removal.
4637 Set_Is_Immediately_Visible (P);
4638 Set_Limited_View_Installed (N);
4640 -- If unit has not been analyzed in some previous context, check
4641 -- (imperfectly ???) whether it might need a body.
4643 if not Analyzed (P_Unit) then
4644 Check_Body_Required;
4647 -- If the package in the limited_with clause is a child unit, the
4648 -- clause is unanalyzed and appears as a selected component. Recast
4649 -- it as an expanded name so that the entity can be properly set. Use
4650 -- entity of parent, if available, for higher ancestors in the name.
4652 if Nkind (Name (N)) = N_Selected_Component then
4660 while Nkind (Nam) = N_Selected_Component
4661 and then Present (Ent)
4663 Change_Selected_Component_To_Expanded_Name (Nam);
4665 -- Set entity of parent identifiers if the unit is a child
4666 -- unit. This ensures that the tree is properly formed from
4667 -- semantic point of view (e.g. for ASIS queries).
4669 Set_Entity (Nam, Ent);
4671 Nam := Prefix (Nam);
4674 -- Set entity of last ancestor
4676 if Nkind (Nam) = N_Identifier then
4677 Set_Entity (Nam, Ent);
4683 Set_Entity (Name (N), P);
4684 Set_From_With_Type (P);
4685 end Install_Limited_Withed_Unit;
4687 -------------------------
4688 -- Install_Withed_Unit --
4689 -------------------------
4691 procedure Install_Withed_Unit
4692 (With_Clause : Node_Id;
4693 Private_With_OK : Boolean := False)
4695 Uname : constant Entity_Id := Entity (Name (With_Clause));
4696 P : constant Entity_Id := Scope (Uname);
4699 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4700 -- compiling a package declaration and the Private_With_OK flag was not
4701 -- set by the caller. These declarations will be installed later (before
4702 -- analyzing the private part of the package).
4704 if Private_Present (With_Clause)
4705 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
4706 and then not (Private_With_OK)
4711 if Debug_Flag_I then
4712 if Private_Present (With_Clause) then
4713 Write_Str ("install private withed unit ");
4715 Write_Str ("install withed unit ");
4718 Write_Name (Chars (Uname));
4722 -- We do not apply the restrictions to an internal unit unless
4723 -- we are compiling the internal unit as a main unit. This check
4724 -- is also skipped for dummy units (for missing packages).
4726 if Sloc (Uname) /= No_Location
4727 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
4728 or else Current_Sem_Unit = Main_Unit)
4730 Check_Restricted_Unit
4731 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
4734 if P /= Standard_Standard then
4736 -- If the unit is not analyzed after analysis of the with clause and
4737 -- it is an instantiation then it awaits a body and is the main unit.
4738 -- Its appearance in the context of some other unit indicates a
4739 -- circular dependency (DEC suite perversity).
4741 if not Analyzed (Uname)
4742 and then Nkind (Parent (Uname)) = N_Package_Instantiation
4745 ("instantiation depends on itself", Name (With_Clause));
4747 elsif not Is_Visible_Child_Unit (Uname) then
4748 Set_Is_Visible_Child_Unit (Uname);
4750 -- If the child unit appears in the context of its parent, it is
4751 -- immediately visible.
4753 if In_Open_Scopes (Scope (Uname)) then
4754 Set_Is_Immediately_Visible (Uname);
4757 if Is_Generic_Instance (Uname)
4758 and then Ekind (Uname) in Subprogram_Kind
4760 -- Set flag as well on the visible entity that denotes the
4761 -- instance, which renames the current one.
4763 Set_Is_Visible_Child_Unit
4765 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
4768 -- The parent unit may have been installed already, and may have
4769 -- appeared in a use clause.
4771 if In_Use (Scope (Uname)) then
4772 Set_Is_Potentially_Use_Visible (Uname);
4775 Set_Context_Installed (With_Clause);
4778 elsif not Is_Immediately_Visible (Uname) then
4779 if not Private_Present (With_Clause)
4780 or else Private_With_OK
4782 Set_Is_Immediately_Visible (Uname);
4785 Set_Context_Installed (With_Clause);
4788 -- A with-clause overrides a with-type clause: there are no restric-
4789 -- tions on the use of package entities.
4791 if Ekind (Uname) = E_Package then
4792 Set_From_With_Type (Uname, False);
4795 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4796 -- unit if there is a visible homograph for it declared in the same
4797 -- declarative region. This pathological case can only arise when an
4798 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4799 -- G1 has a generic child also named G2, and the context includes with_
4800 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4801 -- of I1.G2 visible as well. If the child unit is named Standard, do
4802 -- not apply the check to the Standard package itself.
4804 if Is_Child_Unit (Uname)
4805 and then Is_Visible_Child_Unit (Uname)
4806 and then Ada_Version >= Ada_05
4809 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
4815 U2 := Homonym (Uname);
4817 and then U2 /= Standard_Standard
4820 Decl2 := Unit_Declaration_Node (P2);
4822 if Is_Child_Unit (U2)
4823 and then Is_Visible_Child_Unit (U2)
4825 if Is_Generic_Instance (P)
4826 and then Nkind (Decl1) = N_Package_Declaration
4827 and then Generic_Parent (Specification (Decl1)) = P2
4829 Error_Msg_N ("illegal with_clause", With_Clause);
4831 ("\child unit has visible homograph" &
4832 " (RM 8.3(26), 10.1.1(19))",
4836 elsif Is_Generic_Instance (P2)
4837 and then Nkind (Decl2) = N_Package_Declaration
4838 and then Generic_Parent (Specification (Decl2)) = P
4840 -- With_clause for child unit of instance appears before
4841 -- in the context. We want to place the error message on
4842 -- it, not on the generic child unit itself.
4845 Prev_Clause : Node_Id;
4848 Prev_Clause := First (List_Containing (With_Clause));
4849 while Entity (Name (Prev_Clause)) /= U2 loop
4853 pragma Assert (Present (Prev_Clause));
4854 Error_Msg_N ("illegal with_clause", Prev_Clause);
4856 ("\child unit has visible homograph" &
4857 " (RM 8.3(26), 10.1.1(19))",
4868 end Install_Withed_Unit;
4874 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
4875 K : constant Node_Kind := Nkind (Lib_Unit);
4878 return (K in N_Generic_Declaration or else
4879 K in N_Generic_Instantiation or else
4880 K in N_Generic_Renaming_Declaration or else
4881 K = N_Package_Declaration or else
4882 K = N_Package_Renaming_Declaration or else
4883 K = N_Subprogram_Declaration or else
4884 K = N_Subprogram_Renaming_Declaration)
4885 and then Present (Parent_Spec (Lib_Unit));
4888 -----------------------
4889 -- Load_Needed_Body --
4890 -----------------------
4892 -- N is a generic unit named in a with clause, or else it is a unit that
4893 -- contains a generic unit or an inlined function. In order to perform an
4894 -- instantiation, the body of the unit must be present. If the unit itself
4895 -- is generic, we assume that an instantiation follows, and load & analyze
4896 -- the body unconditionally. This forces analysis of the spec as well.
4898 -- If the unit is not generic, but contains a generic unit, it is loaded on
4899 -- demand, at the point of instantiation (see ch12).
4901 procedure Load_Needed_Body (N : Node_Id; OK : out Boolean) is
4902 Body_Name : Unit_Name_Type;
4903 Unum : Unit_Number_Type;
4905 Save_Style_Check : constant Boolean := Opt.Style_Check;
4906 -- The loading and analysis is done with style checks off
4909 if not GNAT_Mode then
4910 Style_Check := False;
4913 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
4916 (Load_Name => Body_Name,
4922 if Unum = No_Unit then
4926 Compiler_State := Analyzing; -- reset after load
4928 if not Fatal_Error (Unum) or else Try_Semantics then
4929 if Debug_Flag_L then
4930 Write_Str ("*** Loaded generic body");
4934 Semantics (Cunit (Unum));
4940 Style_Check := Save_Style_Check;
4941 end Load_Needed_Body;
4943 -------------------------
4944 -- Build_Limited_Views --
4945 -------------------------
4947 procedure Build_Limited_Views (N : Node_Id) is
4948 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
4949 P : constant Entity_Id := Cunit_Entity (Unum);
4951 Spec : Node_Id; -- To denote a package specification
4952 Lim_Typ : Entity_Id; -- To denote shadow entities
4953 Comp_Typ : Entity_Id; -- To denote real entities
4955 Lim_Header : Entity_Id; -- Package entity
4956 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
4957 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
4959 procedure Decorate_Incomplete_Type
4962 -- Add attributes of an incomplete type to a shadow entity. The same
4963 -- attributes are placed on the real entity, so that gigi receives
4964 -- a consistent view.
4966 procedure Decorate_Package_Specification (P : Entity_Id);
4967 -- Add attributes of a package entity to the entity in a package
4970 procedure Decorate_Tagged_Type
4974 -- Set basic attributes of tagged type T, including its class_wide type.
4975 -- The parameters Loc, Scope are used to decorate the class_wide type.
4977 procedure Build_Chain
4979 First_Decl : Node_Id);
4980 -- Construct list of shadow entities and attach it to entity of
4981 -- package that is mentioned in a limited_with clause.
4983 function New_Internal_Shadow_Entity
4984 (Kind : Entity_Kind;
4985 Sloc_Value : Source_Ptr;
4986 Id_Char : Character) return Entity_Id;
4987 -- Build a new internal entity and append it to the list of shadow
4988 -- entities available through the limited-header
4990 ------------------------------
4991 -- Decorate_Incomplete_Type --
4992 ------------------------------
4994 procedure Decorate_Incomplete_Type
4999 Set_Ekind (E, E_Incomplete_Type);
5000 Set_Scope (E, Scop);
5002 Set_Is_First_Subtype (E, True);
5003 Set_Stored_Constraint (E, No_Elist);
5004 Set_Full_View (E, Empty);
5005 Init_Size_Align (E);
5006 end Decorate_Incomplete_Type;
5008 --------------------------
5009 -- Decorate_Tagged_Type --
5010 --------------------------
5012 procedure Decorate_Tagged_Type
5020 Decorate_Incomplete_Type (T, Scop);
5021 Set_Is_Tagged_Type (T);
5023 -- Build corresponding class_wide type, if not previously done
5025 -- Note: The class-wide entity is shared by the limited-view
5026 -- and the full-view.
5028 if No (Class_Wide_Type (T)) then
5029 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S'));
5031 -- Set parent to be the same as the parent of the tagged type.
5032 -- We need a parent field set, and it is supposed to point to
5033 -- the declaration of the type. The tagged type declaration
5034 -- essentially declares two separate types, the tagged type
5035 -- itself and the corresponding class-wide type, so it is
5036 -- reasonable for the parent fields to point to the declaration
5039 Set_Parent (CW, Parent (T));
5041 -- Set remaining fields of classwide type
5043 Set_Ekind (CW, E_Class_Wide_Type);
5045 Set_Scope (CW, Scop);
5046 Set_Is_Tagged_Type (CW);
5047 Set_Is_First_Subtype (CW, True);
5048 Init_Size_Align (CW);
5049 Set_Has_Unknown_Discriminants (CW, True);
5050 Set_Class_Wide_Type (CW, CW);
5051 Set_Equivalent_Type (CW, Empty);
5052 Set_From_With_Type (CW, From_With_Type (T));
5054 -- Link type to its class-wide type
5056 Set_Class_Wide_Type (T, CW);
5058 end Decorate_Tagged_Type;
5060 ------------------------------------
5061 -- Decorate_Package_Specification --
5062 ------------------------------------
5064 procedure Decorate_Package_Specification (P : Entity_Id) is
5066 -- Place only the most basic attributes
5068 Set_Ekind (P, E_Package);
5069 Set_Etype (P, Standard_Void_Type);
5070 end Decorate_Package_Specification;
5072 --------------------------------
5073 -- New_Internal_Shadow_Entity --
5074 --------------------------------
5076 function New_Internal_Shadow_Entity
5077 (Kind : Entity_Kind;
5078 Sloc_Value : Source_Ptr;
5079 Id_Char : Character) return Entity_Id
5081 E : constant Entity_Id :=
5082 Make_Defining_Identifier (Sloc_Value,
5083 Chars => New_Internal_Name (Id_Char));
5086 Set_Ekind (E, Kind);
5087 Set_Is_Internal (E, True);
5089 if Kind in Type_Kind then
5090 Init_Size_Align (E);
5093 Append_Entity (E, Lim_Header);
5096 end New_Internal_Shadow_Entity;
5102 procedure Build_Chain
5104 First_Decl : Node_Id)
5106 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
5107 Is_Tagged : Boolean;
5112 while Present (Decl) loop
5114 -- For each library_package_declaration in the environment, there
5115 -- is an implicit declaration of a *limited view* of that library
5116 -- package. The limited view of a package contains:
5118 -- * For each nested package_declaration, a declaration of the
5119 -- limited view of that package, with the same defining-
5120 -- program-unit name.
5122 -- * For each type_declaration in the visible part, an incomplete
5123 -- type-declaration with the same defining_identifier, whose
5124 -- completion is the type_declaration. If the type_declaration
5125 -- is tagged, then the incomplete_type_declaration is tagged
5128 -- The partial view is tagged if the declaration has the
5129 -- explicit keyword, or else if it is a type extension, both
5130 -- of which can be ascertained syntactically.
5132 if Nkind (Decl) = N_Full_Type_Declaration then
5134 (Nkind (Type_Definition (Decl)) = N_Record_Definition
5135 and then Tagged_Present (Type_Definition (Decl)))
5137 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
5140 (Record_Extension_Part (Type_Definition (Decl))));
5142 Comp_Typ := Defining_Identifier (Decl);
5144 if not Analyzed_Unit then
5146 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5148 Decorate_Incomplete_Type (Comp_Typ, Scope);
5152 -- Create shadow entity for type
5154 Lim_Typ := New_Internal_Shadow_Entity
5155 (Kind => Ekind (Comp_Typ),
5156 Sloc_Value => Sloc (Comp_Typ),
5159 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5160 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5161 Set_From_With_Type (Lim_Typ);
5164 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5166 Decorate_Incomplete_Type (Lim_Typ, Scope);
5169 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5171 elsif Nkind_In (Decl, N_Private_Type_Declaration,
5172 N_Incomplete_Type_Declaration,
5173 N_Task_Type_Declaration,
5174 N_Protected_Type_Declaration)
5176 Comp_Typ := Defining_Identifier (Decl);
5179 Nkind_In (Decl, N_Private_Type_Declaration,
5180 N_Incomplete_Type_Declaration)
5181 and then Tagged_Present (Decl);
5183 if not Analyzed_Unit then
5185 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5187 Decorate_Incomplete_Type (Comp_Typ, Scope);
5191 Lim_Typ := New_Internal_Shadow_Entity
5192 (Kind => Ekind (Comp_Typ),
5193 Sloc_Value => Sloc (Comp_Typ),
5196 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5197 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5198 Set_From_With_Type (Lim_Typ);
5201 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5203 Decorate_Incomplete_Type (Lim_Typ, Scope);
5206 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5208 elsif Nkind (Decl) = N_Private_Extension_Declaration then
5209 Comp_Typ := Defining_Identifier (Decl);
5211 if not Analyzed_Unit then
5212 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5215 -- Create shadow entity for type
5217 Lim_Typ := New_Internal_Shadow_Entity
5218 (Kind => Ekind (Comp_Typ),
5219 Sloc_Value => Sloc (Comp_Typ),
5222 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5223 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5224 Set_From_With_Type (Lim_Typ);
5226 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5227 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5229 elsif Nkind (Decl) = N_Package_Declaration then
5234 Spec : constant Node_Id := Specification (Decl);
5237 Comp_Typ := Defining_Unit_Name (Spec);
5239 if not Analyzed (Cunit (Unum)) then
5240 Decorate_Package_Specification (Comp_Typ);
5241 Set_Scope (Comp_Typ, Scope);
5244 Lim_Typ := New_Internal_Shadow_Entity
5245 (Kind => Ekind (Comp_Typ),
5246 Sloc_Value => Sloc (Comp_Typ),
5249 Decorate_Package_Specification (Lim_Typ);
5250 Set_Scope (Lim_Typ, Scope);
5252 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5253 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5254 Set_From_With_Type (Lim_Typ);
5256 -- Note: The non_limited_view attribute is not used
5257 -- for local packages.
5261 First_Decl => First (Visible_Declarations (Spec)));
5269 -- Start of processing for Build_Limited_Views
5272 pragma Assert (Limited_Present (N));
5274 -- A library_item mentioned in a limited_with_clause is a package
5275 -- declaration, not a subprogram declaration, generic declaration,
5276 -- generic instantiation, or package renaming declaration.
5278 case Nkind (Unit (Library_Unit (N))) is
5279 when N_Package_Declaration =>
5282 when N_Subprogram_Declaration =>
5283 Error_Msg_N ("subprograms not allowed in "
5284 & "limited with_clauses", N);
5287 when N_Generic_Package_Declaration |
5288 N_Generic_Subprogram_Declaration =>
5289 Error_Msg_N ("generics not allowed in "
5290 & "limited with_clauses", N);
5293 when N_Generic_Instantiation =>
5294 Error_Msg_N ("generic instantiations not allowed in "
5295 & "limited with_clauses", N);
5298 when N_Generic_Renaming_Declaration =>
5299 Error_Msg_N ("generic renamings not allowed in "
5300 & "limited with_clauses", N);
5303 when N_Subprogram_Renaming_Declaration =>
5304 Error_Msg_N ("renamed subprograms not allowed in "
5305 & "limited with_clauses", N);
5308 when N_Package_Renaming_Declaration =>
5309 Error_Msg_N ("renamed packages not allowed in "
5310 & "limited with_clauses", N);
5314 raise Program_Error;
5317 -- Check if the chain is already built
5319 Spec := Specification (Unit (Library_Unit (N)));
5321 if Limited_View_Installed (Spec) then
5325 Set_Ekind (P, E_Package);
5327 -- Build the header of the limited_view
5330 Make_Defining_Identifier (Sloc (N),
5331 Chars => New_Internal_Name (Id_Char => 'Z'));
5332 Set_Ekind (Lim_Header, E_Package);
5333 Set_Is_Internal (Lim_Header);
5334 Set_Limited_View (P, Lim_Header);
5336 -- Create the auxiliary chain. All the shadow entities are appended to
5337 -- the list of entities of the limited-view header
5341 First_Decl => First (Visible_Declarations (Spec)));
5343 -- Save the last built shadow entity. It is needed later to set the
5344 -- reference to the first shadow entity in the private part
5346 Last_Pub_Lim_E := Last_Lim_E;
5348 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5349 -- Required to give support to limited-private-with clauses
5351 Build_Chain (Scope => P,
5352 First_Decl => First (Private_Declarations (Spec)));
5354 if Last_Pub_Lim_E /= Empty then
5355 Set_First_Private_Entity (Lim_Header,
5356 Next_Entity (Last_Pub_Lim_E));
5358 Set_First_Private_Entity (Lim_Header,
5362 Set_Limited_View_Installed (Spec);
5363 end Build_Limited_Views;
5365 -------------------------------
5366 -- Check_Body_Needed_For_SAL --
5367 -------------------------------
5369 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5371 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5372 -- Determine whether use of entity E might require the presence of its
5373 -- body. For a package this requires a recursive traversal of all nested
5376 ---------------------------
5377 -- Entity_Needed_For_SAL --
5378 ---------------------------
5380 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5384 if Is_Subprogram (E)
5385 and then Has_Pragma_Inline (E)
5389 elsif Ekind (E) = E_Generic_Function
5390 or else Ekind (E) = E_Generic_Procedure
5394 elsif Ekind (E) = E_Generic_Package
5396 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5397 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5401 elsif Ekind (E) = E_Package
5403 Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5404 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5406 Ent := First_Entity (E);
5407 while Present (Ent) loop
5408 if Entity_Needs_Body (Ent) then
5420 end Entity_Needs_Body;
5422 -- Start of processing for Check_Body_Needed_For_SAL
5425 if Ekind (Unit_Name) = E_Generic_Package
5427 Nkind (Unit_Declaration_Node (Unit_Name)) =
5428 N_Generic_Package_Declaration
5430 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5432 Set_Body_Needed_For_SAL (Unit_Name);
5434 elsif Ekind (Unit_Name) = E_Generic_Procedure
5435 or else Ekind (Unit_Name) = E_Generic_Function
5437 Set_Body_Needed_For_SAL (Unit_Name);
5439 elsif Is_Subprogram (Unit_Name)
5440 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5441 N_Subprogram_Declaration
5442 and then Has_Pragma_Inline (Unit_Name)
5444 Set_Body_Needed_For_SAL (Unit_Name);
5446 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5447 Check_Body_Needed_For_SAL
5448 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5450 elsif Ekind (Unit_Name) = E_Package
5451 and then Entity_Needs_Body (Unit_Name)
5453 Set_Body_Needed_For_SAL (Unit_Name);
5455 elsif Ekind (Unit_Name) = E_Package_Body
5456 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5458 Check_Body_Needed_For_SAL
5459 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5461 end Check_Body_Needed_For_SAL;
5463 --------------------
5464 -- Remove_Context --
5465 --------------------
5467 procedure Remove_Context (N : Node_Id) is
5468 Lib_Unit : constant Node_Id := Unit (N);
5471 -- If this is a child unit, first remove the parent units
5473 if Is_Child_Spec (Lib_Unit) then
5474 Remove_Parents (Lib_Unit);
5477 Remove_Context_Clauses (N);
5480 ----------------------------
5481 -- Remove_Context_Clauses --
5482 ----------------------------
5484 procedure Remove_Context_Clauses (N : Node_Id) is
5486 Unit_Name : Entity_Id;
5489 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5490 -- limited-views first and regular-views later (to maintain the
5493 -- First Phase: Remove limited_with context clauses
5495 Item := First (Context_Items (N));
5496 while Present (Item) loop
5498 -- We are interested only in with clauses which got installed
5501 if Nkind (Item) = N_With_Clause
5502 and then Limited_Present (Item)
5503 and then Limited_View_Installed (Item)
5505 Remove_Limited_With_Clause (Item);
5511 -- Second Phase: Loop through context items and undo regular
5512 -- with_clauses and use_clauses.
5514 Item := First (Context_Items (N));
5515 while Present (Item) loop
5517 -- We are interested only in with clauses which got installed on
5518 -- entry, as indicated by their Context_Installed flag set
5520 if Nkind (Item) = N_With_Clause
5521 and then Limited_Present (Item)
5522 and then Limited_View_Installed (Item)
5526 elsif Nkind (Item) = N_With_Clause
5527 and then Context_Installed (Item)
5529 -- Remove items from one with'ed unit
5531 Unit_Name := Entity (Name (Item));
5532 Remove_Unit_From_Visibility (Unit_Name);
5533 Set_Context_Installed (Item, False);
5535 elsif Nkind (Item) = N_Use_Package_Clause then
5536 End_Use_Package (Item);
5538 elsif Nkind (Item) = N_Use_Type_Clause then
5539 End_Use_Type (Item);
5544 end Remove_Context_Clauses;
5546 --------------------------------
5547 -- Remove_Limited_With_Clause --
5548 --------------------------------
5550 procedure Remove_Limited_With_Clause (N : Node_Id) is
5551 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5554 Lim_Header : Entity_Id;
5555 Lim_Typ : Entity_Id;
5559 pragma Assert (Limited_View_Installed (N));
5561 -- In case of limited with_clause on subprograms, generics, instances,
5562 -- or renamings, the corresponding error was previously posted and we
5563 -- have nothing to do here.
5565 if Nkind (P_Unit) /= N_Package_Declaration then
5569 P := Defining_Unit_Name (Specification (P_Unit));
5571 -- Handle child packages
5573 if Nkind (P) = N_Defining_Program_Unit_Name then
5574 P := Defining_Identifier (P);
5577 if Debug_Flag_I then
5578 Write_Str ("remove limited view of ");
5579 Write_Name (Chars (P));
5580 Write_Str (" from visibility");
5584 -- Prepare the removal of the shadow entities from visibility. The
5585 -- first element of the limited view is a header (an E_Package
5586 -- entity) that is used to reference the first shadow entity in the
5587 -- private part of the package
5589 Lim_Header := Limited_View (P);
5590 Lim_Typ := First_Entity (Lim_Header);
5592 -- Remove package and shadow entities from visibility if it has not
5595 if not Analyzed (P_Unit) then
5597 Set_Is_Immediately_Visible (P, False);
5599 while Present (Lim_Typ) loop
5601 Next_Entity (Lim_Typ);
5604 -- Otherwise this package has already appeared in the closure and its
5605 -- shadow entities must be replaced by its real entities. This code
5606 -- must be kept synchronized with the complementary code in Install
5607 -- Limited_Withed_Unit.
5610 -- Real entities that are type or subtype declarations were hidden
5611 -- from visibility at the point of installation of the limited-view.
5612 -- Now we recover the previous value of the hidden attribute.
5614 E := First_Entity (P);
5615 while Present (E) and then E /= First_Private_Entity (P) loop
5617 Set_Is_Hidden (E, Was_Hidden (E));
5623 while Present (Lim_Typ)
5624 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5626 -- Nested packages and child units were not unchained
5628 if Ekind (Lim_Typ) /= E_Package
5629 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5631 -- Handle incomplete types of the real view. For this purpose
5632 -- we traverse the list of visible entities to look for an
5633 -- incomplete type in the real-view associated with Lim_Typ.
5635 E := First_Entity (P);
5636 while Present (E) and then E /= First_Private_Entity (P) loop
5637 exit when Ekind (E) = E_Incomplete_Type
5638 and then Present (Full_View (E))
5639 and then Full_View (E) = Lim_Typ;
5644 -- If the previous search was not successful then the entity
5645 -- to be restored in the homonym list is the non-limited view
5647 if E = First_Private_Entity (P) then
5648 E := Non_Limited_View (Lim_Typ);
5651 pragma Assert (not In_Chain (E));
5653 Prev := Current_Entity (Lim_Typ);
5655 if Prev = Lim_Typ then
5656 Set_Current_Entity (E);
5659 while Present (Prev)
5660 and then Homonym (Prev) /= Lim_Typ
5662 Prev := Homonym (Prev);
5665 if Present (Prev) then
5666 Set_Homonym (Prev, E);
5670 -- We must also set the next homonym entity of the real entity
5671 -- to handle the case in which the next homonym was a shadow
5674 Set_Homonym (E, Homonym (Lim_Typ));
5677 Next_Entity (Lim_Typ);
5681 -- Indicate that the limited view of the package is not installed
5683 Set_From_With_Type (P, False);
5684 Set_Limited_View_Installed (N, False);
5685 end Remove_Limited_With_Clause;
5687 --------------------
5688 -- Remove_Parents --
5689 --------------------
5691 procedure Remove_Parents (Lib_Unit : Node_Id) is
5694 P_Spec : Node_Id := Empty;
5696 Vis : constant Boolean :=
5697 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
5700 if Is_Child_Spec (Lib_Unit) then
5701 P_Spec := Parent_Spec (Lib_Unit);
5703 elsif Nkind (Lib_Unit) = N_Package_Body
5704 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
5706 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
5709 if Present (P_Spec) then
5712 P_Name := Get_Parent_Entity (P);
5713 Remove_Context_Clauses (P_Spec);
5714 End_Package_Scope (P_Name);
5715 Set_Is_Immediately_Visible (P_Name, Vis);
5717 -- Remove from visibility the siblings as well, which are directly
5718 -- visible while the parent is in scope.
5720 E := First_Entity (P_Name);
5721 while Present (E) loop
5722 if Is_Child_Unit (E) then
5723 Set_Is_Immediately_Visible (E, False);
5729 Set_In_Package_Body (P_Name, False);
5731 -- This is the recursive call to remove the context of any
5732 -- higher level parent. This recursion ensures that all parents
5733 -- are removed in the reverse order of their installation.
5739 ---------------------------------
5740 -- Remove_Private_With_Clauses --
5741 ---------------------------------
5743 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
5746 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
5747 -- Check whether a given unit appears in a regular with_clause.
5748 -- Used to determine whether a private_with_clause, implicit or
5749 -- explicit, should be ignored.
5751 ----------------------------
5752 -- In_Regular_With_Clause --
5753 ----------------------------
5755 function In_Regular_With_Clause (E : Entity_Id) return Boolean
5760 Item := First (Context_Items (Comp_Unit));
5761 while Present (Item) loop
5762 if Nkind (Item) = N_With_Clause
5763 and then Entity (Name (Item)) = E
5764 and then not Private_Present (Item)
5772 end In_Regular_With_Clause;
5774 -- Start of processing for Remove_Private_With_Clauses
5777 Item := First (Context_Items (Comp_Unit));
5778 while Present (Item) loop
5779 if Nkind (Item) = N_With_Clause
5780 and then Private_Present (Item)
5782 -- If private_with_clause is redundant, remove it from
5783 -- context, as a small optimization to subsequent handling
5784 -- of private_with clauses in other nested packages..
5786 if In_Regular_With_Clause (Entity (Name (Item))) then
5788 Nxt : constant Node_Id := Next (Item);
5794 elsif Limited_Present (Item) then
5795 if not Limited_View_Installed (Item) then
5796 Remove_Limited_With_Clause (Item);
5802 Remove_Unit_From_Visibility (Entity (Name (Item)));
5803 Set_Context_Installed (Item, False);
5811 end Remove_Private_With_Clauses;
5813 ---------------------------------
5814 -- Remove_Unit_From_Visibility --
5815 ---------------------------------
5817 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
5818 P : constant Entity_Id := Scope (Unit_Name);
5821 if Debug_Flag_I then
5822 Write_Str ("remove unit ");
5823 Write_Name (Chars (Unit_Name));
5824 Write_Str (" from visibility");
5828 if P /= Standard_Standard then
5829 Set_Is_Visible_Child_Unit (Unit_Name, False);
5832 Set_Is_Potentially_Use_Visible (Unit_Name, False);
5833 Set_Is_Immediately_Visible (Unit_Name, False);
5834 end Remove_Unit_From_Visibility;
5849 procedure Unchain (E : Entity_Id) is
5853 Prev := Current_Entity (E);
5859 Set_Name_Entity_Id (Chars (E), Homonym (E));
5862 while Present (Prev)
5863 and then Homonym (Prev) /= E
5865 Prev := Homonym (Prev);
5868 if Present (Prev) then
5869 Set_Homonym (Prev, Homonym (E));
5873 if Debug_Flag_I then
5874 Write_Str (" (homonym) unchain ");
5875 Write_Name (Chars (E));
OSDN Git Service
