1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 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 Fname; use Fname;
32 with Fname.UF; use Fname.UF;
33 with Freeze; use Freeze;
34 with Impunit; use Impunit;
35 with Inline; use Inline;
37 with Lib.Load; use Lib.Load;
38 with Lib.Xref; use Lib.Xref;
39 with Namet; use Namet;
40 with Nlists; use Nlists;
41 with Nmake; use Nmake;
43 with Output; use Output;
44 with Restrict; use Restrict;
45 with Rident; use Rident;
46 with Rtsfind; use Rtsfind;
48 with Sem_Ch3; use Sem_Ch3;
49 with Sem_Ch6; use Sem_Ch6;
50 with Sem_Ch7; use Sem_Ch7;
51 with Sem_Ch8; use Sem_Ch8;
52 with Sem_Dist; use Sem_Dist;
53 with Sem_Prag; use Sem_Prag;
54 with Sem_Util; use Sem_Util;
55 with Sem_Warn; use Sem_Warn;
56 with Stand; use Stand;
57 with Sinfo; use Sinfo;
58 with Sinfo.CN; use Sinfo.CN;
59 with Sinput; use Sinput;
60 with Snames; use Snames;
61 with Style; use Style;
62 with Stylesw; use Stylesw;
63 with Tbuild; use Tbuild;
64 with Uname; use Uname;
66 package body Sem_Ch10 is
68 -----------------------
69 -- Local Subprograms --
70 -----------------------
72 procedure Analyze_Context (N : Node_Id);
73 -- Analyzes items in the context clause of compilation unit
75 procedure Build_Limited_Views (N : Node_Id);
76 -- Build and decorate the list of shadow entities for a package mentioned
77 -- in a limited_with clause. If the package was not previously analyzed
78 -- then it also performs a basic decoration of the real entities; this
79 -- is required to do not pass non-decorated entities to the back-end.
80 -- Implements Ada 2005 (AI-50217).
82 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id);
83 -- Check whether the source for the body of a compilation unit must
84 -- be included in a standalone library.
86 procedure Check_Private_Child_Unit (N : Node_Id);
87 -- If a with_clause mentions a private child unit, the compilation
88 -- unit must be a member of the same family, as described in 10.1.2.
90 procedure Check_Stub_Level (N : Node_Id);
91 -- Verify that a stub is declared immediately within a compilation unit,
92 -- and not in an inner frame.
94 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id);
95 -- When a child unit appears in a context clause, the implicit withs on
96 -- parents are made explicit, and with clauses are inserted in the context
97 -- clause before the one for the child. If a parent in the with_clause
98 -- is a renaming, the implicit with_clause is on the renaming whose name
99 -- is mentioned in the with_clause, and not on the package it renames.
100 -- N is the compilation unit whose list of context items receives the
101 -- implicit with_clauses.
103 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
104 -- Get defining entity of parent unit of a child unit. In most cases this
105 -- is the defining entity of the unit, but for a child instance whose
106 -- parent needs a body for inlining, the instantiation node of the parent
107 -- has not yet been rewritten as a package declaration, and the entity has
108 -- to be retrieved from the Instance_Spec of the unit.
110 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id);
111 -- If the main unit is a child unit, implicit withs are also added for
112 -- all its ancestors.
114 function In_Chain (E : Entity_Id) return Boolean;
115 -- Check that the shadow entity is not already in the homonym chain, for
116 -- example through a limited_with clause in a parent unit.
118 procedure Install_Context_Clauses (N : Node_Id);
119 -- Subsidiary to Install_Context and Install_Parents. Process only with_
120 -- and use_clauses for current unit and its library unit if any.
122 procedure Install_Limited_Context_Clauses (N : Node_Id);
123 -- Subsidiary to Install_Context. Process only limited with_clauses
124 -- for current unit. Implements Ada 2005 (AI-50217).
126 procedure Install_Limited_Withed_Unit (N : Node_Id);
127 -- Place shadow entities for a limited_with package in the visibility
128 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
130 procedure Install_Withed_Unit
131 (With_Clause : Node_Id;
132 Private_With_OK : Boolean := False);
133 -- If the unit is not a child unit, make unit immediately visible.
134 -- The caller ensures that the unit is not already currently installed.
135 -- The flag Private_With_OK is set true in Install_Private_With_Clauses,
136 -- which is called when compiling the private part of a package, or
137 -- installing the private declarations of a parent unit.
139 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean);
140 -- This procedure establishes the context for the compilation of a child
141 -- unit. If Lib_Unit is a child library spec then the context of the parent
142 -- is installed, and the parent itself made immediately visible, so that
143 -- the child unit is processed in the declarative region of the parent.
144 -- Install_Parents makes a recursive call to itself to ensure that all
145 -- parents are loaded in the nested case. If Lib_Unit is a library body,
146 -- the only effect of Install_Parents is to install the private decls of
147 -- the parents, because the visible parent declarations will have been
148 -- installed as part of the context of the corresponding spec.
150 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id);
151 -- In the compilation of a child unit, a child of any of the ancestor
152 -- units is directly visible if it is visible, because the parent is in
153 -- an enclosing scope. Iterate over context to find child units of U_Name
154 -- or of some ancestor of it.
156 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean;
157 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
158 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
159 -- a library spec that has a parent. If the call to Is_Child_Spec returns
160 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
161 -- compilation unit for the parent spec.
163 -- Lib_Unit can also be a subprogram body that acts as its own spec. If
164 -- the Parent_Spec is non-empty, this is also a child unit.
166 procedure Remove_Context_Clauses (N : Node_Id);
167 -- Subsidiary of previous one. Remove use_ and with_clauses
169 procedure Remove_Limited_With_Clause (N : Node_Id);
170 -- Remove from visibility the shadow entities introduced for a package
171 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
173 procedure Remove_Parents (Lib_Unit : Node_Id);
174 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
175 -- contexts established by the corresponding call to Install_Parents are
176 -- removed. Remove_Parents contains a recursive call to itself to ensure
177 -- that all parents are removed in the nested case.
179 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
180 -- Reset all visibility flags on unit after compiling it, either as a
181 -- main unit or as a unit in the context.
183 procedure Unchain (E : Entity_Id);
184 -- Remove single entity from visibility list
186 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
187 -- Common processing for all stubs (subprograms, tasks, packages, and
188 -- protected cases). N is the stub to be analyzed. Once the subunit
189 -- name is established, load and analyze. Nam is the non-overloadable
190 -- entity for which the proper body provides a completion. Subprogram
191 -- stubs are handled differently because they can be declarations.
194 -- A dummy procedure, for debugging use, called just before analyzing the
195 -- main unit (after dealing with any context clauses).
197 --------------------------
198 -- Limited_With_Clauses --
199 --------------------------
201 -- Limited_With clauses are the mechanism chosen for Ada05 to support
202 -- mutually recursive types declared in different units. A limited_with
203 -- clause that names package P in the context of unit U makes the types
204 -- declared in the visible part of P available within U, but with the
205 -- restriction that these types can only be used as incomplete types.
206 -- The limited_with clause does not impose a semantic dependence on P,
207 -- and it is possible for two packages to have limited_with_clauses on
208 -- each other without creating an elaboration circularity.
210 -- To support this feature, the analysis of a limited_with clause must
211 -- create an abbreviated view of the package, without performing any
212 -- semantic analysis on it. This "package abstract" contains shadow
213 -- types that are in one-one correspondence with the real types in the
214 -- package, and that have the properties of incomplete types.
216 -- The implementation creates two element lists: one to chain the shadow
217 -- entities, and one to chain the corresponding type entities in the tree
218 -- of the package. Links between corresponding entities in both chains
219 -- allow the compiler to select the proper view of a given type, depending
220 -- on the context. Note that in contrast with the handling of private
221 -- types, the limited view and the non-limited view of a type are treated
222 -- as separate entities, and no entity exchange needs to take place, which
223 -- makes the implementation must simpler than could be feared.
225 ------------------------------
226 -- Analyze_Compilation_Unit --
227 ------------------------------
229 procedure Analyze_Compilation_Unit (N : Node_Id) is
230 Unit_Node : constant Node_Id := Unit (N);
231 Lib_Unit : Node_Id := Library_Unit (N);
233 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
234 Par_Spec_Name : Unit_Name_Type;
235 Unum : Unit_Number_Type;
237 procedure Check_Redundant_Withs
238 (Context_Items : List_Id;
239 Spec_Context_Items : List_Id := No_List);
240 -- Determine whether the context list of a compilation unit contains
241 -- redundant with clauses. When checking body clauses against spec
242 -- clauses, set Context_Items to the context list of the body and
243 -- Spec_Context_Items to that of the spec. Parent packages are not
244 -- examined for documentation purposes.
246 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
247 -- Generate cross-reference information for the parents of child units.
248 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
250 ---------------------------
251 -- Check_Redundant_Withs --
252 ---------------------------
254 procedure Check_Redundant_Withs
255 (Context_Items : List_Id;
256 Spec_Context_Items : List_Id := No_List)
260 procedure Process_Body_Clauses
261 (Context_List : List_Id;
263 Used : in out Boolean;
264 Used_Type_Or_Elab : in out Boolean);
265 -- Examine the context clauses of a package body, trying to match
266 -- the name entity of Clause with any list element. If the match
267 -- occurs on a use package clause, set Used to True, for a use
268 -- type clause, pragma Elaborate or pragma Elaborate_All, set
269 -- Used_Type_Or_Elab to True.
271 procedure Process_Spec_Clauses
272 (Context_List : List_Id;
274 Used : in out Boolean;
275 Withed : in out Boolean;
276 Exit_On_Self : Boolean := False);
277 -- Examine the context clauses of a package spec, trying to match
278 -- the name entity of Clause with any list element. If the match
279 -- occurs on a use package clause, set Used to True, for a with
280 -- package clause other than Clause, set Withed to True. Limited
281 -- with clauses, implicitly generated with clauses and withs
282 -- having pragmas Elaborate or Elaborate_All applied to them are
283 -- skipped. Exit_On_Self is used to control the search loop and
284 -- force an exit whenever Clause sees itself in the search.
286 --------------------------
287 -- Process_Body_Clauses --
288 --------------------------
290 procedure Process_Body_Clauses
291 (Context_List : List_Id;
293 Used : in out Boolean;
294 Used_Type_Or_Elab : in out Boolean)
296 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
302 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean;
303 -- In an expanded name in a use clause, if the prefix is a
304 -- renamed package, the entity is set to the original package
305 -- as a result, when checking whether the package appears in a
306 -- previous with_clause, the renaming has to be taken into
307 -- account, to prevent spurious or incorrect warnings. The
308 -- common case is the use of Text_IO.
314 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean is
316 return Entity (N) = P
318 (Present (Renamed_Object (P))
319 and then Entity (N) = Renamed_Object (P));
322 -- Start of processing for Process_Body_Clauses
326 Used_Type_Or_Elab := False;
328 Cont_Item := First (Context_List);
329 while Present (Cont_Item) loop
331 -- Package use clause
333 if Nkind (Cont_Item) = N_Use_Package_Clause
336 -- Search through use clauses
338 Use_Item := First (Names (Cont_Item));
339 while Present (Use_Item) and then not Used loop
341 -- Case of a direct use of the one we are looking for
343 if Entity (Use_Item) = Nam_Ent then
346 -- Handle nested case, as in "with P; use P.Q.R"
353 -- Loop through prefixes looking for match
356 while Nkind (UE) = N_Expanded_Name loop
357 if Same_Unit (Prefix (UE), Nam_Ent) then
372 elsif Nkind (Cont_Item) = N_Use_Type_Clause
373 and then not Used_Type_Or_Elab
375 Subt_Mark := First (Subtype_Marks (Cont_Item));
376 while Present (Subt_Mark)
377 and then not Used_Type_Or_Elab
379 if Same_Unit (Prefix (Subt_Mark), Nam_Ent) then
380 Used_Type_Or_Elab := True;
386 -- Pragma Elaborate or Elaborate_All
388 elsif Nkind (Cont_Item) = N_Pragma
390 (Chars (Cont_Item) = Name_Elaborate
392 Chars (Cont_Item) = Name_Elaborate_All)
393 and then not Used_Type_Or_Elab
396 First (Pragma_Argument_Associations (Cont_Item));
397 while Present (Prag_Unit)
398 and then not Used_Type_Or_Elab
400 if Entity (Expression (Prag_Unit)) = Nam_Ent then
401 Used_Type_Or_Elab := True;
410 end Process_Body_Clauses;
412 --------------------------
413 -- Process_Spec_Clauses --
414 --------------------------
416 procedure Process_Spec_Clauses
417 (Context_List : List_Id;
419 Used : in out Boolean;
420 Withed : in out Boolean;
421 Exit_On_Self : Boolean := False)
423 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
431 Cont_Item := First (Context_List);
432 while Present (Cont_Item) loop
434 -- Stop the search since the context items after Cont_Item
435 -- have already been examined in a previous iteration of
436 -- the reverse loop in Check_Redundant_Withs.
439 and Cont_Item = Clause
444 -- Package use clause
446 if Nkind (Cont_Item) = N_Use_Package_Clause
449 Use_Item := First (Names (Cont_Item));
450 while Present (Use_Item) and then not Used loop
451 if Entity (Use_Item) = Nam_Ent then
458 -- Package with clause. Avoid processing self, implicitly
459 -- generated with clauses or limited with clauses. Note
460 -- that we examine with clauses having pragmas Elaborate
461 -- or Elaborate_All applied to them due to cases such as:
465 -- pragma Elaborate (Pack);
467 -- In this case, the second with clause is redundant since
468 -- the pragma applies only to the first "with Pack;".
470 elsif Nkind (Cont_Item) = N_With_Clause
471 and then not Implicit_With (Cont_Item)
472 and then not Limited_Present (Cont_Item)
473 and then Cont_Item /= Clause
474 and then Entity (Name (Cont_Item)) = Nam_Ent
481 end Process_Spec_Clauses;
483 -- Start of processing for Check_Redundant_Withs
486 Clause := Last (Context_Items);
487 while Present (Clause) loop
489 -- Avoid checking implicitly generated with clauses, limited
490 -- with clauses or withs that have pragma Elaborate or
491 -- Elaborate_All apllied.
493 if Nkind (Clause) = N_With_Clause
494 and then not Implicit_With (Clause)
495 and then not Limited_Present (Clause)
496 and then not Elaborate_Present (Clause)
498 -- Package body-to-spec check
500 if Present (Spec_Context_Items) then
502 Used_In_Body : Boolean := False;
503 Used_In_Spec : Boolean := False;
504 Used_Type_Or_Elab : Boolean := False;
505 Withed_In_Spec : Boolean := False;
509 (Context_List => Spec_Context_Items,
511 Used => Used_In_Spec,
512 Withed => Withed_In_Spec);
515 (Context_List => Context_Items,
517 Used => Used_In_Body,
518 Used_Type_Or_Elab => Used_Type_Or_Elab);
520 -- "Type Elab" refers to the presence of either a use
521 -- type clause, pragmas Elaborate or Elaborate_All.
523 -- +---------------+---------------------------+------+
524 -- | Spec | Body | Warn |
525 -- +--------+------+--------+------+-----------+------+
526 -- | Withed | Used | Withed | Used | Type Elab | |
527 -- | X | | X | | | X |
528 -- | X | | X | X | | |
529 -- | X | | X | | X | |
530 -- | X | | X | X | X | |
531 -- | X | X | X | | | X |
532 -- | X | X | X | | X | |
533 -- | X | X | X | X | | X |
534 -- | X | X | X | X | X | |
535 -- +--------+------+--------+------+-----------+------+
538 and then not Used_Type_Or_Elab)
541 and then not Used_In_Body)
545 Error_Msg_N ("?redundant with clause in body", Clause);
548 Used_In_Body := False;
549 Used_In_Spec := False;
550 Used_Type_Or_Elab := False;
551 Withed_In_Spec := False;
554 -- Standalone package spec or body check
558 Dont_Care : Boolean := False;
559 Withed : Boolean := False;
562 -- The mechanism for examining the context clauses of a
563 -- package spec can be applied to package body clauses.
566 (Context_List => Context_Items,
570 Exit_On_Self => True);
573 Error_Msg_N ("?redundant with clause", Clause);
581 end Check_Redundant_Withs;
583 --------------------------------
584 -- Generate_Parent_References --
585 --------------------------------
587 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is
589 P_Name : Entity_Id := P_Id;
592 Pref := Name (Parent (Defining_Entity (N)));
594 if Nkind (Pref) = N_Expanded_Name then
596 -- Done already, if the unit has been compiled indirectly as
597 -- part of the closure of its context because of inlining.
602 while Nkind (Pref) = N_Selected_Component loop
603 Change_Selected_Component_To_Expanded_Name (Pref);
604 Set_Entity (Pref, P_Name);
605 Set_Etype (Pref, Etype (P_Name));
606 Generate_Reference (P_Name, Pref, 'r');
607 Pref := Prefix (Pref);
608 P_Name := Scope (P_Name);
611 -- The guard here on P_Name is to handle the error condition where
612 -- the parent unit is missing because the file was not found.
614 if Present (P_Name) then
615 Set_Entity (Pref, P_Name);
616 Set_Etype (Pref, Etype (P_Name));
617 Generate_Reference (P_Name, Pref, 'r');
618 Style.Check_Identifier (Pref, P_Name);
620 end Generate_Parent_References;
622 -- Start of processing for Analyze_Compilation_Unit
625 Process_Compilation_Unit_Pragmas (N);
627 -- If the unit is a subunit whose parent has not been analyzed (which
628 -- indicates that the main unit is a subunit, either the current one or
629 -- one of its descendents) then the subunit is compiled as part of the
630 -- analysis of the parent, which we proceed to do. Basically this gets
631 -- handled from the top down and we don't want to do anything at this
632 -- level (i.e. this subunit will be handled on the way down from the
633 -- parent), so at this level we immediately return. If the subunit
634 -- ends up not analyzed, it means that the parent did not contain a
635 -- stub for it, or that there errors were dectected in some ancestor.
637 if Nkind (Unit_Node) = N_Subunit
638 and then not Analyzed (Lib_Unit)
640 Semantics (Lib_Unit);
642 if not Analyzed (Proper_Body (Unit_Node)) then
643 if Serious_Errors_Detected > 0 then
644 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N);
646 Error_Msg_N ("missing stub for subunit", N);
653 -- Analyze context (this will call Sem recursively for with'ed units)
657 -- If the unit is a package body, the spec is already loaded and must
658 -- be analyzed first, before we analyze the body.
660 if Nkind (Unit_Node) = N_Package_Body then
662 -- If no Lib_Unit, then there was a serious previous error, so
663 -- just ignore the entire analysis effort
665 if No (Lib_Unit) then
669 Semantics (Lib_Unit);
670 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
672 -- Verify that the library unit is a package declaration
674 if not Nkind_In (Unit (Lib_Unit), N_Package_Declaration,
675 N_Generic_Package_Declaration)
678 ("no legal package declaration for package body", N);
681 -- Otherwise, the entity in the declaration is visible. Update
682 -- the version to reflect dependence of this body on the spec.
685 Spec_Id := Defining_Entity (Unit (Lib_Unit));
686 Set_Is_Immediately_Visible (Spec_Id, True);
687 Version_Update (N, Lib_Unit);
689 if Nkind (Defining_Unit_Name (Unit_Node)) =
690 N_Defining_Program_Unit_Name
692 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
697 -- If the unit is a subprogram body, then we similarly need to analyze
698 -- its spec. However, things are a little simpler in this case, because
699 -- here, this analysis is done only for error checking and consistency
700 -- purposes, so there's nothing else to be done.
702 elsif Nkind (Unit_Node) = N_Subprogram_Body then
703 if Acts_As_Spec (N) then
705 -- If the subprogram body is a child unit, we must create a
706 -- declaration for it, in order to properly load the parent(s).
707 -- After this, the original unit does not acts as a spec, because
708 -- there is an explicit one. If this unit appears in a context
709 -- clause, then an implicit with on the parent will be added when
710 -- installing the context. If this is the main unit, there is no
711 -- Unit_Table entry for the declaration (it has the unit number
712 -- of the main unit) and code generation is unaffected.
714 Unum := Get_Cunit_Unit_Number (N);
715 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
717 if Par_Spec_Name /= No_Unit_Name then
720 (Load_Name => Par_Spec_Name,
725 if Unum /= No_Unit then
727 -- Build subprogram declaration and attach parent unit to it
728 -- This subprogram declaration does not come from source,
729 -- Nevertheless the backend must generate debugging info for
730 -- it, and this must be indicated explicitly. We also mark
731 -- the body entity as a child unit now, to prevent a
732 -- cascaded error if the spec entity cannot be entered
736 Loc : constant Source_Ptr := Sloc (N);
737 SCS : constant Boolean :=
738 Get_Comes_From_Source_Default;
741 Set_Comes_From_Source_Default (False);
743 Make_Compilation_Unit (Loc,
744 Context_Items => New_Copy_List (Context_Items (N)),
746 Make_Subprogram_Declaration (Sloc (N),
749 (Specification (Unit_Node))),
751 Make_Compilation_Unit_Aux (Loc));
753 Set_Library_Unit (N, Lib_Unit);
754 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
755 Semantics (Lib_Unit);
757 -- Now that a separate declaration exists, the body
758 -- of the child unit does not act as spec any longer.
760 Set_Acts_As_Spec (N, False);
761 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
762 Set_Needs_Debug_Info (Defining_Entity (Unit (Lib_Unit)));
763 Set_Comes_From_Source_Default (SCS);
768 -- Here for subprogram with separate declaration
771 Semantics (Lib_Unit);
772 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
773 Version_Update (N, Lib_Unit);
776 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
777 N_Defining_Program_Unit_Name
779 Generate_Parent_References (
780 Specification (Unit_Node),
781 Scope (Defining_Entity (Unit (Lib_Unit))));
785 -- If it is a child unit, the parent must be elaborated first
786 -- and we update version, since we are dependent on our parent.
788 if Is_Child_Spec (Unit_Node) then
790 -- The analysis of the parent is done with style checks off
793 Save_Style_Check : constant Boolean := Style_Check;
794 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
795 Cunit_Boolean_Restrictions_Save;
798 if not GNAT_Mode then
799 Style_Check := False;
802 Semantics (Parent_Spec (Unit_Node));
803 Version_Update (N, Parent_Spec (Unit_Node));
804 Style_Check := Save_Style_Check;
805 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
809 -- With the analysis done, install the context. Note that we can't
810 -- install the context from the with clauses as we analyze them, because
811 -- each with clause must be analyzed in a clean visibility context, so
812 -- we have to wait and install them all at once.
816 if Is_Child_Spec (Unit_Node) then
818 -- Set the entities of all parents in the program_unit_name
820 Generate_Parent_References (
821 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
824 -- All components of the context: with-clauses, library unit, ancestors
825 -- if any, (and their context) are analyzed and installed.
827 -- Call special debug routine sm if this is the main unit
829 if Current_Sem_Unit = Main_Unit then
833 -- Now analyze the unit (package, subprogram spec, body) itself
837 if Warn_On_Redundant_Constructs then
838 Check_Redundant_Withs (Context_Items (N));
840 if Nkind (Unit_Node) = N_Package_Body then
841 Check_Redundant_Withs
842 (Context_Items => Context_Items (N),
843 Spec_Context_Items => Context_Items (Lib_Unit));
847 -- The above call might have made Unit_Node an N_Subprogram_Body from
848 -- something else, so propagate any Acts_As_Spec flag.
850 if Nkind (Unit_Node) = N_Subprogram_Body
851 and then Acts_As_Spec (Unit_Node)
853 Set_Acts_As_Spec (N);
856 -- Register predefined units in Rtsfind
859 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
861 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
862 Set_RTU_Loaded (Unit_Node);
866 -- Treat compilation unit pragmas that appear after the library unit
868 if Present (Pragmas_After (Aux_Decls_Node (N))) then
870 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
872 while Present (Prag_Node) loop
879 -- Generate distribution stubs if requested and no error
882 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
884 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
885 and then not Fatal_Error (Main_Unit)
887 if Is_RCI_Pkg_Spec_Or_Body (N) then
889 -- Regular RCI package
891 Add_Stub_Constructs (N);
893 elsif (Nkind (Unit_Node) = N_Package_Declaration
894 and then Is_Shared_Passive (Defining_Entity
895 (Specification (Unit_Node))))
896 or else (Nkind (Unit_Node) = N_Package_Body
898 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
900 -- Shared passive package
902 Add_Stub_Constructs (N);
904 elsif Nkind (Unit_Node) = N_Package_Instantiation
906 Is_Remote_Call_Interface
907 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
909 -- Instantiation of a RCI generic package
911 Add_Stub_Constructs (N);
916 -- Remove unit from visibility, so that environment is clean for
917 -- the next compilation, which is either the main unit or some
918 -- other unit in the context.
920 if Nkind_In (Unit_Node, N_Package_Declaration,
921 N_Package_Renaming_Declaration,
922 N_Subprogram_Declaration)
923 or else Nkind (Unit_Node) in N_Generic_Declaration
925 (Nkind (Unit_Node) = N_Subprogram_Body
926 and then Acts_As_Spec (Unit_Node))
928 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
930 -- If the unit is an instantiation whose body will be elaborated for
931 -- inlining purposes, use the the proper entity of the instance. The
932 -- entity may be missing if the instantiation was illegal.
934 elsif Nkind (Unit_Node) = N_Package_Instantiation
935 and then not Error_Posted (Unit_Node)
936 and then Present (Instance_Spec (Unit_Node))
938 Remove_Unit_From_Visibility
939 (Defining_Entity (Instance_Spec (Unit_Node)));
941 elsif Nkind (Unit_Node) = N_Package_Body
942 or else (Nkind (Unit_Node) = N_Subprogram_Body
943 and then not Acts_As_Spec (Unit_Node))
945 -- Bodies that are not the main unit are compiled if they are generic
946 -- or contain generic or inlined units. Their analysis brings in the
947 -- context of the corresponding spec (unit declaration) which must be
948 -- removed as well, to return the compilation environment to its
951 Remove_Context (Lib_Unit);
952 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
955 -- Last step is to deinstall the context we just installed as well as
956 -- the unit just compiled.
960 -- If this is the main unit and we are generating code, we must check
961 -- that all generic units in the context have a body if they need it,
962 -- even if they have not been instantiated. In the absence of .ali files
963 -- for generic units, we must force the load of the body, just to
964 -- produce the proper error if the body is absent. We skip this
965 -- verification if the main unit itself is generic.
967 if Get_Cunit_Unit_Number (N) = Main_Unit
968 and then Operating_Mode = Generate_Code
969 and then Expander_Active
971 -- Check whether the source for the body of the unit must be included
972 -- in a standalone library.
974 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
976 -- Indicate that the main unit is now analyzed, to catch possible
977 -- circularities between it and generic bodies. Remove main unit from
978 -- visibility. This might seem superfluous, but the main unit must
979 -- not be visible in the generic body expansions that follow.
981 Set_Analyzed (N, True);
982 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
987 Un : Unit_Number_Type;
989 Save_Style_Check : constant Boolean := Style_Check;
990 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
991 Cunit_Boolean_Restrictions_Save;
994 Item := First (Context_Items (N));
995 while Present (Item) loop
997 -- Check for explicit with clause
999 if Nkind (Item) = N_With_Clause
1000 and then not Implicit_With (Item)
1002 -- Ada 2005 (AI-50217): Ignore limited-withed units
1004 and then not Limited_Present (Item)
1006 Nam := Entity (Name (Item));
1008 if (Is_Generic_Subprogram (Nam)
1009 and then not Is_Intrinsic_Subprogram (Nam))
1010 or else (Ekind (Nam) = E_Generic_Package
1011 and then Unit_Requires_Body (Nam))
1013 Style_Check := False;
1015 if Present (Renamed_Object (Nam)) then
1018 (Load_Name => Get_Body_Name
1020 (Unit_Declaration_Node
1021 (Renamed_Object (Nam)))),
1029 (Load_Name => Get_Body_Name
1030 (Get_Unit_Name (Item)),
1037 if Un = No_Unit then
1039 ("body of generic unit& not found", Item, Nam);
1042 elsif not Analyzed (Cunit (Un))
1043 and then Un /= Main_Unit
1044 and then not Fatal_Error (Un)
1046 Style_Check := False;
1047 Semantics (Cunit (Un));
1055 Style_Check := Save_Style_Check;
1056 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1060 -- Deal with creating elaboration Boolean if needed. We create an
1061 -- elaboration boolean only for units that come from source since
1062 -- units manufactured by the compiler never need elab checks.
1064 if Comes_From_Source (N)
1065 and then Nkind_In (Unit_Node, N_Package_Declaration,
1066 N_Generic_Package_Declaration,
1067 N_Subprogram_Declaration,
1068 N_Generic_Subprogram_Declaration)
1071 Loc : constant Source_Ptr := Sloc (N);
1072 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1075 Spec_Id := Defining_Entity (Unit_Node);
1076 Generate_Definition (Spec_Id);
1078 -- See if an elaboration entity is required for possible access
1079 -- before elaboration checking. Note that we must allow for this
1080 -- even if -gnatE is not set, since a client may be compiled in
1081 -- -gnatE mode and reference the entity.
1083 -- These entities are also used by the binder to prevent multiple
1084 -- attempts to execute the elaboration code for the library case
1085 -- where the elaboration routine might otherwise be called more
1088 -- Case of units which do not require elaboration checks
1091 -- Pure units do not need checks
1095 -- Preelaborated units do not need checks
1097 or else Is_Preelaborated (Spec_Id)
1099 -- No checks needed if pagma Elaborate_Body present
1101 or else Has_Pragma_Elaborate_Body (Spec_Id)
1103 -- No checks needed if unit does not require a body
1105 or else not Unit_Requires_Body (Spec_Id)
1107 -- No checks needed for predefined files
1109 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1111 -- No checks required if no separate spec
1113 or else Acts_As_Spec (N)
1115 -- This is a case where we only need the entity for
1116 -- checking to prevent multiple elaboration checks.
1118 Set_Elaboration_Entity_Required (Spec_Id, False);
1120 -- Case of elaboration entity is required for access before
1121 -- elaboration checking (so certainly we must build it!)
1124 Set_Elaboration_Entity_Required (Spec_Id, True);
1127 Build_Elaboration_Entity (N, Spec_Id);
1131 -- Freeze the compilation unit entity. This for sure is needed because
1132 -- of some warnings that can be output (see Freeze_Subprogram), but may
1133 -- in general be required. If freezing actions result, place them in the
1134 -- compilation unit actions list, and analyze them.
1137 Loc : constant Source_Ptr := Sloc (N);
1138 L : constant List_Id :=
1139 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), Loc);
1141 while Is_Non_Empty_List (L) loop
1142 Insert_Library_Level_Action (Remove_Head (L));
1148 if Nkind (Unit_Node) = N_Package_Declaration
1149 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1150 and then Expander_Active
1153 Save_Style_Check : constant Boolean := Style_Check;
1154 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1155 Options : Style_Check_Options;
1158 Save_Style_Check_Options (Options);
1159 Reset_Style_Check_Options;
1160 Opt.Warning_Mode := Suppress;
1161 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1163 Reset_Style_Check_Options;
1164 Set_Style_Check_Options (Options);
1165 Style_Check := Save_Style_Check;
1166 Warning_Mode := Save_Warning;
1170 -- If we are generating obsolescent warnings, then here is where we
1171 -- generate them for the with'ed items. The reason for this special
1172 -- processing is that the normal mechanism of generating the warnings
1173 -- for referenced entities does not work for context clause references.
1174 -- That's because when we first analyze the context, it is too early to
1175 -- know if the with'ing unit is itself obsolescent (which suppresses
1178 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1180 -- Push current compilation unit as scope, so that the test for
1181 -- being within an obsolescent unit will work correctly.
1183 Push_Scope (Defining_Entity (Unit_Node));
1185 -- Loop through context items to deal with with clauses
1193 Item := First (Context_Items (N));
1194 while Present (Item) loop
1195 if Nkind (Item) = N_With_Clause
1197 -- Suppress this check in limited-withed units. Further work
1198 -- needed here if we decide to incorporate this check on
1199 -- limited-withed units.
1201 and then not Limited_Present (Item)
1204 Ent := Entity (Nam);
1206 if Is_Obsolescent (Ent) then
1207 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1215 -- Remove temporary install of current unit as scope
1219 end Analyze_Compilation_Unit;
1221 ---------------------
1222 -- Analyze_Context --
1223 ---------------------
1225 procedure Analyze_Context (N : Node_Id) is
1226 Ukind : constant Node_Kind := Nkind (Unit (N));
1230 -- First process all configuration pragmas at the start of the context
1231 -- items. Strictly these are not part of the context clause, but that
1232 -- is where the parser puts them. In any case for sure we must analyze
1233 -- these before analyzing the actual context items, since they can have
1234 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1235 -- be with'ed as a result of changing categorizations in Ada 2005).
1237 Item := First (Context_Items (N));
1238 while Present (Item)
1239 and then Nkind (Item) = N_Pragma
1240 and then Chars (Item) in Configuration_Pragma_Names
1246 -- Loop through actual context items. This is done in two passes:
1248 -- a) The first pass analyzes non-limited with-clauses and also any
1249 -- configuration pragmas (we need to get the latter analyzed right
1250 -- away, since they can affect processing of subsequent items.
1252 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1254 while Present (Item) loop
1256 -- For with clause, analyze the with clause, and then update
1257 -- the version, since we are dependent on a unit that we with.
1259 if Nkind (Item) = N_With_Clause
1260 and then not Limited_Present (Item)
1262 -- Skip analyzing with clause if no unit, nothing to do (this
1263 -- happens for a with that references a non-existant unit)
1265 if Present (Library_Unit (Item)) then
1269 if not Implicit_With (Item) then
1270 Version_Update (N, Library_Unit (Item));
1273 -- Skip pragmas. Configuration pragmas at the start were handled in
1274 -- the loop above, and remaining pragmas are not processed until we
1275 -- actually install the context (see Install_Context). We delay the
1276 -- analysis of these pragmas to make sure that we have installed all
1277 -- the implicit with's on parent units.
1279 -- Skip use clauses at this stage, since we don't want to do any
1280 -- installing of potentially use visible entities until we we
1281 -- actually install the complete context (in Install_Context).
1282 -- Otherwise things can get installed in the wrong context.
1291 -- Second pass: examine all limited_with clauses. All other context
1292 -- items are ignored in this pass.
1294 Item := First (Context_Items (N));
1295 while Present (Item) loop
1296 if Nkind (Item) = N_With_Clause
1297 and then Limited_Present (Item)
1299 -- No need to check errors on implicitly generated limited-with
1302 if not Implicit_With (Item) then
1304 -- Check compilation unit containing the limited-with clause
1306 if not Nkind_In (Ukind, N_Package_Declaration,
1307 N_Subprogram_Declaration,
1308 N_Package_Renaming_Declaration,
1309 N_Subprogram_Renaming_Declaration)
1310 and then Ukind not in N_Generic_Declaration
1311 and then Ukind not in N_Generic_Renaming_Declaration
1312 and then Ukind not in N_Generic_Instantiation
1314 Error_Msg_N ("limited with_clause not allowed here", Item);
1316 -- Check wrong use of a limited with clause applied to the
1317 -- compilation unit containing the limited-with clause.
1319 -- limited with P.Q;
1320 -- package P.Q is ...
1322 elsif Unit (Library_Unit (Item)) = Unit (N) then
1323 Error_Msg_N ("wrong use of limited-with clause", Item);
1325 -- Check wrong use of limited-with clause applied to some
1326 -- immediate ancestor.
1328 elsif Is_Child_Spec (Unit (N)) then
1330 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1334 P := Parent_Spec (Unit (N));
1336 if Unit (P) = Lib_U then
1337 Error_Msg_N ("limited with_clause of immediate "
1338 & "ancestor not allowed", Item);
1342 exit when not Is_Child_Spec (Unit (P));
1343 P := Parent_Spec (Unit (P));
1348 -- Check if the limited-withed unit is already visible through
1349 -- some context clause of the current compilation unit or some
1350 -- ancestor of the current compilation unit.
1353 Lim_Unit_Name : constant Node_Id := Name (Item);
1354 Comp_Unit : Node_Id;
1356 Unit_Name : Node_Id;
1361 It := First (Context_Items (Comp_Unit));
1362 while Present (It) loop
1364 and then Nkind (It) = N_With_Clause
1365 and then not Limited_Present (It)
1367 Nkind_In (Unit (Library_Unit (It)),
1368 N_Package_Declaration,
1369 N_Package_Renaming_Declaration)
1371 if Nkind (Unit (Library_Unit (It))) =
1372 N_Package_Declaration
1374 Unit_Name := Name (It);
1376 Unit_Name := Name (Unit (Library_Unit (It)));
1379 -- Check if the named package (or some ancestor)
1380 -- leaves visible the full-view of the unit given
1381 -- in the limited-with clause
1384 if Designate_Same_Unit (Lim_Unit_Name,
1387 Error_Msg_Sloc := Sloc (It);
1389 ("simultaneous visibility of limited "
1390 & "and unlimited views not allowed",
1393 ("\unlimited view visible through "
1394 & "context clause #",
1398 elsif Nkind (Unit_Name) = N_Identifier then
1402 Unit_Name := Prefix (Unit_Name);
1409 exit when not Is_Child_Spec (Unit (Comp_Unit));
1411 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1416 -- Skip analyzing with clause if no unit, see above
1418 if Present (Library_Unit (Item)) then
1422 -- A limited_with does not impose an elaboration order, but
1423 -- there is a semantic dependency for recompilation purposes.
1425 if not Implicit_With (Item) then
1426 Version_Update (N, Library_Unit (Item));
1429 -- Pragmas and use clauses and with clauses other than limited
1430 -- with's are ignored in this pass through the context items.
1438 end Analyze_Context;
1440 -------------------------------
1441 -- Analyze_Package_Body_Stub --
1442 -------------------------------
1444 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1445 Id : constant Entity_Id := Defining_Identifier (N);
1449 -- The package declaration must be in the current declarative part
1451 Check_Stub_Level (N);
1452 Nam := Current_Entity_In_Scope (Id);
1454 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1455 Error_Msg_N ("missing specification for package stub", N);
1457 elsif Has_Completion (Nam)
1458 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1460 Error_Msg_N ("duplicate or redundant stub for package", N);
1463 -- Indicate that the body of the package exists. If we are doing
1464 -- only semantic analysis, the stub stands for the body. If we are
1465 -- generating code, the existence of the body will be confirmed
1466 -- when we load the proper body.
1468 Set_Has_Completion (Nam);
1469 Set_Scope (Defining_Entity (N), Current_Scope);
1470 Generate_Reference (Nam, Id, 'b');
1471 Analyze_Proper_Body (N, Nam);
1473 end Analyze_Package_Body_Stub;
1475 -------------------------
1476 -- Analyze_Proper_Body --
1477 -------------------------
1479 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1480 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1481 Unum : Unit_Number_Type;
1483 procedure Optional_Subunit;
1484 -- This procedure is called when the main unit is a stub, or when we
1485 -- are not generating code. In such a case, we analyze the subunit if
1486 -- present, which is user-friendly and in fact required for ASIS, but
1487 -- we don't complain if the subunit is missing.
1489 ----------------------
1490 -- Optional_Subunit --
1491 ----------------------
1493 procedure Optional_Subunit is
1494 Comp_Unit : Node_Id;
1497 -- Try to load subunit, but ignore any errors that occur during
1498 -- the loading of the subunit, by using the special feature in
1499 -- Errout to ignore all errors. Note that Fatal_Error will still
1500 -- be set, so we will be able to check for this case below.
1502 if not ASIS_Mode then
1503 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1508 (Load_Name => Subunit_Name,
1513 if not ASIS_Mode then
1514 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1517 -- All done if we successfully loaded the subunit
1520 and then (not Fatal_Error (Unum) or else Try_Semantics)
1522 Comp_Unit := Cunit (Unum);
1524 -- If the file was empty or seriously mangled, the unit
1525 -- itself may be missing.
1527 if No (Unit (Comp_Unit)) then
1529 ("subunit does not contain expected proper body", N);
1531 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1533 ("expected SEPARATE subunit, found child unit",
1534 Cunit_Entity (Unum));
1536 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1537 Analyze_Subunit (Comp_Unit);
1538 Set_Library_Unit (N, Comp_Unit);
1541 elsif Unum = No_Unit
1542 and then Present (Nam)
1544 if Is_Protected_Type (Nam) then
1545 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1547 Set_Corresponding_Body (
1548 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1551 end Optional_Subunit;
1553 -- Start of processing for Analyze_Proper_Body
1556 -- If the subunit is already loaded, it means that the main unit
1557 -- is a subunit, and that the current unit is one of its parents
1558 -- which was being analyzed to provide the needed context for the
1559 -- analysis of the subunit. In this case we analyze the subunit and
1560 -- continue with the parent, without looking a subsequent subunits.
1562 if Is_Loaded (Subunit_Name) then
1564 -- If the proper body is already linked to the stub node,
1565 -- the stub is in a generic unit and just needs analyzing.
1567 if Present (Library_Unit (N)) then
1568 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1569 Analyze_Subunit (Library_Unit (N));
1571 -- Otherwise we must load the subunit and link to it
1574 -- Load the subunit, this must work, since we originally
1575 -- loaded the subunit earlier on. So this will not really
1576 -- load it, just give access to it.
1580 (Load_Name => Subunit_Name,
1585 -- And analyze the subunit in the parent context (note that we
1586 -- do not call Semantics, since that would remove the parent
1587 -- context). Because of this, we have to manually reset the
1588 -- compiler state to Analyzing since it got destroyed by Load.
1590 if Unum /= No_Unit then
1591 Compiler_State := Analyzing;
1593 -- Check that the proper body is a subunit and not a child
1594 -- unit. If the unit was previously loaded, the error will
1595 -- have been emitted when copying the generic node, so we
1596 -- just return to avoid cascaded errors.
1598 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1602 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1603 Analyze_Subunit (Cunit (Unum));
1604 Set_Library_Unit (N, Cunit (Unum));
1608 -- If the main unit is a subunit, then we are just performing semantic
1609 -- analysis on that subunit, and any other subunits of any parent unit
1610 -- should be ignored, except that if we are building trees for ASIS
1611 -- usage we want to annotate the stub properly.
1613 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1614 and then Subunit_Name /= Unit_Name (Main_Unit)
1620 -- But before we return, set the flag for unloaded subunits. This
1621 -- will suppress junk warnings of variables in the same declarative
1622 -- part (or a higher level one) that are in danger of looking unused
1623 -- when in fact there might be a declaration in the subunit that we
1624 -- do not intend to load.
1626 Unloaded_Subunits := True;
1629 -- If the subunit is not already loaded, and we are generating code,
1630 -- then this is the case where compilation started from the parent,
1631 -- and we are generating code for an entire subunit tree. In that
1632 -- case we definitely need to load the subunit.
1634 -- In order to continue the analysis with the rest of the parent,
1635 -- and other subunits, we load the unit without requiring its
1636 -- presence, and emit a warning if not found, rather than terminating
1637 -- the compilation abruptly, as for other missing file problems.
1639 elsif Original_Operating_Mode = Generate_Code then
1641 -- If the proper body is already linked to the stub node,
1642 -- the stub is in a generic unit and just needs analyzing.
1644 -- We update the version. Although we are not technically
1645 -- semantically dependent on the subunit, given our approach
1646 -- of macro substitution of subunits, it makes sense to
1647 -- include it in the version identification.
1649 if Present (Library_Unit (N)) then
1650 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1651 Analyze_Subunit (Library_Unit (N));
1652 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1654 -- Otherwise we must load the subunit and link to it
1659 (Load_Name => Subunit_Name,
1664 if Original_Operating_Mode = Generate_Code
1665 and then Unum = No_Unit
1667 Error_Msg_Unit_1 := Subunit_Name;
1669 Get_File_Name (Subunit_Name, Subunit => True);
1671 ("subunit$$ in file{ not found?", N);
1672 Subunits_Missing := True;
1675 -- Load_Unit may reset Compiler_State, since it may have been
1676 -- necessary to parse an additional units, so we make sure
1677 -- that we reset it to the Analyzing state.
1679 Compiler_State := Analyzing;
1681 if Unum /= No_Unit then
1682 if Debug_Flag_L then
1683 Write_Str ("*** Loaded subunit from stub. Analyze");
1688 Comp_Unit : constant Node_Id := Cunit (Unum);
1691 -- Check for child unit instead of subunit
1693 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1695 ("expected SEPARATE subunit, found child unit",
1696 Cunit_Entity (Unum));
1698 -- OK, we have a subunit
1701 -- Set corresponding stub (even if errors)
1703 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1705 -- Analyze the unit if semantics active
1707 if not Fatal_Error (Unum) or else Try_Semantics then
1708 Analyze_Subunit (Comp_Unit);
1711 -- Set the library unit pointer in any case
1713 Set_Library_Unit (N, Comp_Unit);
1715 -- We update the version. Although we are not technically
1716 -- semantically dependent on the subunit, given our
1717 -- approach of macro substitution of subunits, it makes
1718 -- sense to include it in the version identification.
1720 Version_Update (Cunit (Main_Unit), Comp_Unit);
1726 -- The remaining case is when the subunit is not already loaded and
1727 -- we are not generating code. In this case we are just performing
1728 -- semantic analysis on the parent, and we are not interested in
1729 -- the subunit. For subprograms, analyze the stub as a body. For
1730 -- other entities the stub has already been marked as completed.
1736 end Analyze_Proper_Body;
1738 ----------------------------------
1739 -- Analyze_Protected_Body_Stub --
1740 ----------------------------------
1742 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1743 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1746 Check_Stub_Level (N);
1748 -- First occurence of name may have been as an incomplete type
1750 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1751 Nam := Full_View (Nam);
1755 or else not Is_Protected_Type (Etype (Nam))
1757 Error_Msg_N ("missing specification for Protected body", N);
1759 Set_Scope (Defining_Entity (N), Current_Scope);
1760 Set_Has_Completion (Etype (Nam));
1761 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1762 Analyze_Proper_Body (N, Etype (Nam));
1764 end Analyze_Protected_Body_Stub;
1766 ----------------------------------
1767 -- Analyze_Subprogram_Body_Stub --
1768 ----------------------------------
1770 -- A subprogram body stub can appear with or without a previous
1771 -- specification. If there is one, the analysis of the body will
1772 -- find it and verify conformance. The formals appearing in the
1773 -- specification of the stub play no role, except for requiring an
1774 -- additional conformance check. If there is no previous subprogram
1775 -- declaration, the stub acts as a spec, and provides the defining
1776 -- entity for the subprogram.
1778 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1782 Check_Stub_Level (N);
1784 -- Verify that the identifier for the stub is unique within this
1785 -- declarative part.
1787 if Nkind_In (Parent (N), N_Block_Statement,
1791 Decl := First (Declarations (Parent (N)));
1792 while Present (Decl)
1795 if Nkind (Decl) = N_Subprogram_Body_Stub
1796 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1797 Chars (Defining_Unit_Name (Specification (N))))
1799 Error_Msg_N ("identifier for stub is not unique", N);
1806 -- Treat stub as a body, which checks conformance if there is a previous
1807 -- declaration, or else introduces entity and its signature.
1809 Analyze_Subprogram_Body (N);
1810 Analyze_Proper_Body (N, Empty);
1811 end Analyze_Subprogram_Body_Stub;
1813 ---------------------
1814 -- Analyze_Subunit --
1815 ---------------------
1817 -- A subunit is compiled either by itself (for semantic checking)
1818 -- or as part of compiling the parent (for code generation). In
1819 -- either case, by the time we actually process the subunit, the
1820 -- parent has already been installed and analyzed. The node N is
1821 -- a compilation unit, whose context needs to be treated here,
1822 -- because we come directly here from the parent without calling
1823 -- Analyze_Compilation_Unit.
1825 -- The compilation context includes the explicit context of the
1826 -- subunit, and the context of the parent, together with the parent
1827 -- itself. In order to compile the current context, we remove the
1828 -- one inherited from the parent, in order to have a clean visibility
1829 -- table. We restore the parent context before analyzing the proper
1830 -- body itself. On exit, we remove only the explicit context of the
1833 procedure Analyze_Subunit (N : Node_Id) is
1834 Lib_Unit : constant Node_Id := Library_Unit (N);
1835 Par_Unit : constant Entity_Id := Current_Scope;
1837 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1838 Num_Scopes : Int := 0;
1839 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1840 Enclosing_Child : Entity_Id := Empty;
1841 Svg : constant Suppress_Array := Scope_Suppress;
1843 procedure Analyze_Subunit_Context;
1844 -- Capture names in use clauses of the subunit. This must be done
1845 -- before re-installing parent declarations, because items in the
1846 -- context must not be hidden by declarations local to the parent.
1848 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1849 -- Recursive procedure to restore scope of all ancestors of subunit,
1850 -- from outermost in. If parent is not a subunit, the call to install
1851 -- context installs context of spec and (if parent is a child unit)
1852 -- the context of its parents as well. It is confusing that parents
1853 -- should be treated differently in both cases, but the semantics are
1854 -- just not identical.
1856 procedure Re_Install_Use_Clauses;
1857 -- As part of the removal of the parent scope, the use clauses are
1858 -- removed, to be reinstalled when the context of the subunit has
1859 -- been analyzed. Use clauses may also have been affected by the
1860 -- analysis of the context of the subunit, so they have to be applied
1861 -- again, to insure that the compilation environment of the rest of
1862 -- the parent unit is identical.
1864 procedure Remove_Scope;
1865 -- Remove current scope from scope stack, and preserve the list
1866 -- of use clauses in it, to be reinstalled after context is analyzed.
1868 -----------------------------
1869 -- Analyze_Subunit_Context --
1870 -----------------------------
1872 procedure Analyze_Subunit_Context is
1875 Unit_Name : Entity_Id;
1878 Analyze_Context (N);
1880 -- Make withed units immediately visible. If child unit, make the
1881 -- ultimate parent immediately visible.
1883 Item := First (Context_Items (N));
1884 while Present (Item) loop
1885 if Nkind (Item) = N_With_Clause then
1887 -- Protect frontend against previous errors in context clauses
1889 if Nkind (Name (Item)) /= N_Selected_Component then
1890 if Error_Posted (Item) then
1894 Unit_Name := Entity (Name (Item));
1895 while Is_Child_Unit (Unit_Name) loop
1896 Set_Is_Visible_Child_Unit (Unit_Name);
1897 Unit_Name := Scope (Unit_Name);
1900 if not Is_Immediately_Visible (Unit_Name) then
1901 Set_Is_Immediately_Visible (Unit_Name);
1902 Set_Context_Installed (Item);
1907 elsif Nkind (Item) = N_Use_Package_Clause then
1908 Nam := First (Names (Item));
1909 while Present (Nam) loop
1914 elsif Nkind (Item) = N_Use_Type_Clause then
1915 Nam := First (Subtype_Marks (Item));
1916 while Present (Nam) loop
1925 -- Reset visibility of withed units. They will be made visible
1926 -- again when we install the subunit context.
1928 Item := First (Context_Items (N));
1929 while Present (Item) loop
1930 if Nkind (Item) = N_With_Clause
1932 -- Protect frontend against previous errors in context clauses
1934 and then Nkind (Name (Item)) /= N_Selected_Component
1935 and then not Error_Posted (Item)
1937 Unit_Name := Entity (Name (Item));
1938 while Is_Child_Unit (Unit_Name) loop
1939 Set_Is_Visible_Child_Unit (Unit_Name, False);
1940 Unit_Name := Scope (Unit_Name);
1943 if Context_Installed (Item) then
1944 Set_Is_Immediately_Visible (Unit_Name, False);
1945 Set_Context_Installed (Item, False);
1951 end Analyze_Subunit_Context;
1953 ------------------------
1954 -- Re_Install_Parents --
1955 ------------------------
1957 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
1961 if Nkind (Unit (L)) = N_Subunit then
1962 Re_Install_Parents (Library_Unit (L), Scope (Scop));
1965 Install_Context (L);
1967 -- If the subunit occurs within a child unit, we must restore the
1968 -- immediate visibility of any siblings that may occur in context.
1970 if Present (Enclosing_Child) then
1971 Install_Siblings (Enclosing_Child, L);
1976 if Scop /= Par_Unit then
1977 Set_Is_Immediately_Visible (Scop);
1980 -- Make entities in scope visible again. For child units, restore
1981 -- visibility only if they are actually in context.
1983 E := First_Entity (Current_Scope);
1984 while Present (E) loop
1985 if not Is_Child_Unit (E)
1986 or else Is_Visible_Child_Unit (E)
1988 Set_Is_Immediately_Visible (E);
1994 -- A subunit appears within a body, and for a nested subunits
1995 -- all the parents are bodies. Restore full visibility of their
1996 -- private entities.
1998 if Ekind (Scop) = E_Package
1999 or else Ekind (Scop) = E_Generic_Package
2001 Set_In_Package_Body (Scop);
2002 Install_Private_Declarations (Scop);
2004 end Re_Install_Parents;
2006 ----------------------------
2007 -- Re_Install_Use_Clauses --
2008 ----------------------------
2010 procedure Re_Install_Use_Clauses is
2013 for J in reverse 1 .. Num_Scopes loop
2014 U := Use_Clauses (J);
2015 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2016 Install_Use_Clauses (U, Force_Installation => True);
2018 end Re_Install_Use_Clauses;
2024 procedure Remove_Scope is
2028 Num_Scopes := Num_Scopes + 1;
2029 Use_Clauses (Num_Scopes) :=
2030 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2032 E := First_Entity (Current_Scope);
2033 while Present (E) loop
2034 Set_Is_Immediately_Visible (E, False);
2038 if Is_Child_Unit (Current_Scope) then
2039 Enclosing_Child := Current_Scope;
2045 -- Start of processing for Analyze_Subunit
2048 if not Is_Empty_List (Context_Items (N)) then
2050 -- Save current use clauses
2053 Remove_Context (Lib_Unit);
2055 -- Now remove parents and their context, including enclosing
2056 -- subunits and the outer parent body which is not a subunit.
2058 if Present (Lib_Spec) then
2059 Remove_Context (Lib_Spec);
2061 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2062 Lib_Spec := Library_Unit (Lib_Spec);
2064 Remove_Context (Lib_Spec);
2067 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2071 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2072 Remove_Context (Library_Unit (Lib_Spec));
2076 Set_Is_Immediately_Visible (Par_Unit, False);
2078 Analyze_Subunit_Context;
2080 Re_Install_Parents (Lib_Unit, Par_Unit);
2081 Set_Is_Immediately_Visible (Par_Unit);
2083 -- If the context includes a child unit of the parent of the
2084 -- subunit, the parent will have been removed from visibility,
2085 -- after compiling that cousin in the context. The visibility
2086 -- of the parent must be restored now. This also applies if the
2087 -- context includes another subunit of the same parent which in
2088 -- turn includes a child unit in its context.
2090 if Ekind (Par_Unit) = E_Package
2091 or else Ekind (Par_Unit) = E_Generic_Package
2093 if not Is_Immediately_Visible (Par_Unit)
2094 or else (Present (First_Entity (Par_Unit))
2095 and then not Is_Immediately_Visible
2096 (First_Entity (Par_Unit)))
2098 Set_Is_Immediately_Visible (Par_Unit);
2099 Install_Visible_Declarations (Par_Unit);
2100 Install_Private_Declarations (Par_Unit);
2104 Re_Install_Use_Clauses;
2105 Install_Context (N);
2107 -- Restore state of suppress flags for current body
2109 Scope_Suppress := Svg;
2111 -- If the subunit is within a child unit, then siblings of any
2112 -- parent unit that appear in the context clause of the subunit
2113 -- must also be made immediately visible.
2115 if Present (Enclosing_Child) then
2116 Install_Siblings (Enclosing_Child, N);
2121 Analyze (Proper_Body (Unit (N)));
2124 -- The subunit may contain a with_clause on a sibling of some
2125 -- ancestor. Removing the context will remove from visibility those
2126 -- ancestor child units, which must be restored to the visibility
2127 -- they have in the enclosing body.
2129 if Present (Enclosing_Child) then
2135 and then Is_Child_Unit (C)
2137 Set_Is_Immediately_Visible (C);
2138 Set_Is_Visible_Child_Unit (C);
2143 end Analyze_Subunit;
2145 ----------------------------
2146 -- Analyze_Task_Body_Stub --
2147 ----------------------------
2149 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2150 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2151 Loc : constant Source_Ptr := Sloc (N);
2154 Check_Stub_Level (N);
2156 -- First occurence of name may have been as an incomplete type
2158 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2159 Nam := Full_View (Nam);
2163 or else not Is_Task_Type (Etype (Nam))
2165 Error_Msg_N ("missing specification for task body", N);
2167 Set_Scope (Defining_Entity (N), Current_Scope);
2168 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2169 Set_Has_Completion (Etype (Nam));
2170 Analyze_Proper_Body (N, Etype (Nam));
2172 -- Set elaboration flag to indicate that entity is callable.
2173 -- This cannot be done in the expansion of the body itself,
2174 -- because the proper body is not in a declarative part. This
2175 -- is only done if expansion is active, because the context
2176 -- may be generic and the flag not defined yet.
2178 if Expander_Active then
2180 Make_Assignment_Statement (Loc,
2182 Make_Identifier (Loc,
2183 New_External_Name (Chars (Etype (Nam)), 'E')),
2184 Expression => New_Reference_To (Standard_True, Loc)));
2188 end Analyze_Task_Body_Stub;
2190 -------------------------
2191 -- Analyze_With_Clause --
2192 -------------------------
2194 -- Analyze the declaration of a unit in a with clause. At end,
2195 -- label the with clause with the defining entity for the unit.
2197 procedure Analyze_With_Clause (N : Node_Id) is
2199 -- Retrieve the original kind of the unit node, before analysis.
2200 -- If it is a subprogram instantiation, its analysis below will
2201 -- rewrite as the declaration of the wrapper package. If the same
2202 -- instantiation appears indirectly elsewhere in the context, it
2203 -- will have been analyzed already.
2205 Unit_Kind : constant Node_Kind :=
2206 Nkind (Original_Node (Unit (Library_Unit (N))));
2207 Nam : constant Node_Id := Name (N);
2209 Par_Name : Entity_Id;
2214 -- Set True if the unit currently being compiled is an internal unit
2216 Save_Style_Check : constant Boolean := Opt.Style_Check;
2217 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
2218 Cunit_Boolean_Restrictions_Save;
2221 if Limited_Present (N) then
2223 -- Ada 2005 (AI-50217): Build visibility structures but do not
2224 -- analyze the unit.
2226 Build_Limited_Views (N);
2230 -- We reset ordinary style checking during the analysis of a with'ed
2231 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2232 -- definitely *does* apply to with'ed units).
2234 if not GNAT_Mode then
2235 Style_Check := False;
2238 -- If the library unit is a predefined unit, and we are in high
2239 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2240 -- for the analysis of the with'ed unit. This mode does not prevent
2241 -- explicit with'ing of run-time units.
2243 if Configurable_Run_Time_Mode
2245 Is_Predefined_File_Name
2246 (Unit_File_Name (Get_Source_Unit (Unit (Library_Unit (N)))))
2248 Configurable_Run_Time_Mode := False;
2249 Semantics (Library_Unit (N));
2250 Configurable_Run_Time_Mode := True;
2253 Semantics (Library_Unit (N));
2256 U := Unit (Library_Unit (N));
2257 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2259 -- Following checks are skipped for dummy packages (those supplied for
2260 -- with's where no matching file could be found). Such packages are
2261 -- identified by the Sloc value being set to No_Location
2263 if Sloc (U) /= No_Location then
2265 -- Check restrictions, except that we skip the check if this is an
2266 -- internal unit unless we are compiling the internal unit as the
2267 -- main unit. We also skip this for dummy packages.
2269 Check_Restriction_No_Dependence (Nam, N);
2271 if not Intunit or else Current_Sem_Unit = Main_Unit then
2272 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2275 -- Deal with special case of GNAT.Current_Exceptions which interacts
2276 -- with the optimization of local raise statements into gotos.
2278 if Nkind (Nam) = N_Selected_Component
2279 and then Nkind (Prefix (Nam)) = N_Identifier
2280 and then Chars (Prefix (Nam)) = Name_Gnat
2281 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2283 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2285 Check_Restriction (No_Exception_Propagation, N);
2286 Special_Exception_Package_Used := True;
2289 -- Check for inappropriate with of internal implementation unit if we
2290 -- are currently compiling the main unit and the main unit is itself
2291 -- not an internal unit. We do not issue this message for implicit
2292 -- with's generated by the compiler itself.
2294 if Implementation_Unit_Warnings
2295 and then Current_Sem_Unit = Main_Unit
2296 and then not Intunit
2297 and then not Implicit_With (N)
2298 and then not GNAT_Mode
2301 U_Kind : constant Kind_Of_Unit :=
2302 Get_Kind_Of_Unit (Get_Source_Unit (U));
2305 if U_Kind = Implementation_Unit then
2306 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2308 ("\use of this unit is non-portable " &
2309 "and version-dependent?",
2312 elsif U_Kind = Ada_05_Unit
2313 and then Ada_Version < Ada_05
2314 and then Warn_On_Ada_2005_Compatibility
2316 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2322 -- Semantic analysis of a generic unit is performed on a copy of
2323 -- the original tree. Retrieve the entity on which semantic info
2324 -- actually appears.
2326 if Unit_Kind in N_Generic_Declaration then
2327 E_Name := Defining_Entity (U);
2329 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2330 -- the case of an instantiation, semantic analysis above will have
2331 -- replaced the unit by its instantiated version. If the instance body
2332 -- has been generated, the instance now denotes the body entity. For
2333 -- visibility purposes we need the entity of its spec.
2335 elsif (Unit_Kind = N_Package_Instantiation
2336 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2337 N_Package_Instantiation)
2338 and then Nkind (U) = N_Package_Body
2340 E_Name := Corresponding_Spec (U);
2342 elsif Unit_Kind = N_Package_Instantiation
2343 and then Nkind (U) = N_Package_Instantiation
2345 -- If the instance has not been rewritten as a package declaration,
2346 -- then it appeared already in a previous with clause. Retrieve
2347 -- the entity from the previous instance.
2349 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2351 elsif Unit_Kind in N_Subprogram_Instantiation then
2353 -- Instantiation node is replaced with a wrapper package. Retrieve
2354 -- the visible subprogram created by the instance from corresponding
2355 -- attribute of the wrapper.
2357 E_Name := Related_Instance (Defining_Entity (U));
2359 elsif Unit_Kind = N_Package_Renaming_Declaration
2360 or else Unit_Kind in N_Generic_Renaming_Declaration
2362 E_Name := Defining_Entity (U);
2364 elsif Unit_Kind = N_Subprogram_Body
2365 and then Nkind (Name (N)) = N_Selected_Component
2366 and then not Acts_As_Spec (Library_Unit (N))
2368 -- For a child unit that has no spec, one has been created and
2369 -- analyzed. The entity required is that of the spec.
2371 E_Name := Corresponding_Spec (U);
2374 E_Name := Defining_Entity (U);
2377 if Nkind (Name (N)) = N_Selected_Component then
2379 -- Child unit in a with clause
2381 Change_Selected_Component_To_Expanded_Name (Name (N));
2384 -- Restore style checks and restrictions
2386 Style_Check := Save_Style_Check;
2387 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2389 -- Record the reference, but do NOT set the unit as referenced, we want
2390 -- to consider the unit as unreferenced if this is the only reference
2393 Set_Entity_With_Style_Check (Name (N), E_Name);
2394 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2396 if Is_Child_Unit (E_Name) then
2397 Pref := Prefix (Name (N));
2398 Par_Name := Scope (E_Name);
2399 while Nkind (Pref) = N_Selected_Component loop
2400 Change_Selected_Component_To_Expanded_Name (Pref);
2401 Set_Entity_With_Style_Check (Pref, Par_Name);
2403 Generate_Reference (Par_Name, Pref);
2404 Pref := Prefix (Pref);
2406 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2407 -- is set to Standard_Standard, and no attempt should be made to
2408 -- further unwind scopes.
2410 if Par_Name /= Standard_Standard then
2411 Par_Name := Scope (Par_Name);
2415 if Present (Entity (Pref))
2416 and then not Analyzed (Parent (Parent (Entity (Pref))))
2418 -- If the entity is set without its unit being compiled, the
2419 -- original parent is a renaming, and Par_Name is the renamed
2420 -- entity. For visibility purposes, we need the original entity,
2421 -- which must be analyzed now because Load_Unit directly retrieves
2422 -- the renamed unit, and the renaming declaration itself has not
2425 Analyze (Parent (Parent (Entity (Pref))));
2426 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2427 Par_Name := Entity (Pref);
2430 Set_Entity_With_Style_Check (Pref, Par_Name);
2431 Generate_Reference (Par_Name, Pref);
2434 -- If the withed unit is System, and a system extension pragma is
2435 -- present, compile the extension now, rather than waiting for a
2436 -- visibility check on a specific entity.
2438 if Chars (E_Name) = Name_System
2439 and then Scope (E_Name) = Standard_Standard
2440 and then Present (System_Extend_Unit)
2441 and then Present_System_Aux (N)
2443 -- If the extension is not present, an error will have been emitted
2448 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2449 -- to private_with units; they will be made visible later (just before
2450 -- the private part is analyzed)
2452 if Private_Present (N) then
2453 Set_Is_Immediately_Visible (E_Name, False);
2455 end Analyze_With_Clause;
2457 ------------------------------
2458 -- Check_Private_Child_Unit --
2459 ------------------------------
2461 procedure Check_Private_Child_Unit (N : Node_Id) is
2462 Lib_Unit : constant Node_Id := Unit (N);
2464 Curr_Unit : Entity_Id;
2465 Sub_Parent : Node_Id;
2466 Priv_Child : Entity_Id;
2467 Par_Lib : Entity_Id;
2470 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2471 -- Returns true if and only if the library unit is declared with
2472 -- an explicit designation of private.
2474 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2475 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2478 return Private_Present (Comp_Unit);
2479 end Is_Private_Library_Unit;
2481 -- Start of processing for Check_Private_Child_Unit
2484 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2485 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2486 Par_Lib := Curr_Unit;
2488 elsif Nkind (Lib_Unit) = N_Subunit then
2490 -- The parent is itself a body. The parent entity is to be found in
2491 -- the corresponding spec.
2493 Sub_Parent := Library_Unit (N);
2494 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2496 -- If the parent itself is a subunit, Curr_Unit is the entity
2497 -- of the enclosing body, retrieve the spec entity which is
2498 -- the proper ancestor we need for the following tests.
2500 if Ekind (Curr_Unit) = E_Package_Body then
2501 Curr_Unit := Spec_Entity (Curr_Unit);
2504 Par_Lib := Curr_Unit;
2507 Curr_Unit := Defining_Entity (Lib_Unit);
2509 Par_Lib := Curr_Unit;
2510 Par_Spec := Parent_Spec (Lib_Unit);
2512 if No (Par_Spec) then
2515 Par_Lib := Defining_Entity (Unit (Par_Spec));
2519 -- Loop through context items
2521 Item := First (Context_Items (N));
2522 while Present (Item) loop
2524 -- Ada 2005 (AI-262): Allow private_with of a private child package
2525 -- in public siblings
2527 if Nkind (Item) = N_With_Clause
2528 and then not Implicit_With (Item)
2529 and then Is_Private_Descendant (Entity (Name (Item)))
2531 Priv_Child := Entity (Name (Item));
2534 Curr_Parent : Entity_Id := Par_Lib;
2535 Child_Parent : Entity_Id := Scope (Priv_Child);
2536 Prv_Ancestor : Entity_Id := Child_Parent;
2537 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2540 -- If the child unit is a public child then locate the nearest
2541 -- private ancestor. Child_Parent will then be set to the
2542 -- parent of that ancestor.
2544 if not Is_Private_Library_Unit (Priv_Child) then
2545 while Present (Prv_Ancestor)
2546 and then not Is_Private_Library_Unit (Prv_Ancestor)
2548 Prv_Ancestor := Scope (Prv_Ancestor);
2551 if Present (Prv_Ancestor) then
2552 Child_Parent := Scope (Prv_Ancestor);
2556 while Present (Curr_Parent)
2557 and then Curr_Parent /= Standard_Standard
2558 and then Curr_Parent /= Child_Parent
2561 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2562 Curr_Parent := Scope (Curr_Parent);
2565 if No (Curr_Parent) then
2566 Curr_Parent := Standard_Standard;
2569 if Curr_Parent /= Child_Parent then
2570 if Ekind (Priv_Child) = E_Generic_Package
2571 and then Chars (Priv_Child) in Text_IO_Package_Name
2572 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2575 ("& is a nested package, not a compilation unit",
2576 Name (Item), Priv_Child);
2580 ("unit in with clause is private child unit!", Item);
2582 ("\current unit must also have parent&!",
2583 Item, Child_Parent);
2587 or else Private_Present (Item)
2588 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2589 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2590 and then not Acts_As_Spec (Parent (Lib_Unit)))
2596 ("current unit must also be private descendant of&",
2597 Item, Child_Parent);
2605 end Check_Private_Child_Unit;
2607 ----------------------
2608 -- Check_Stub_Level --
2609 ----------------------
2611 procedure Check_Stub_Level (N : Node_Id) is
2612 Par : constant Node_Id := Parent (N);
2613 Kind : constant Node_Kind := Nkind (Par);
2616 if Nkind_In (Kind, N_Package_Body,
2620 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2624 -- In an instance, a missing stub appears at any level. A warning
2625 -- message will have been emitted already for the missing file.
2627 elsif not In_Instance then
2628 Error_Msg_N ("stub cannot appear in an inner scope", N);
2630 elsif Expander_Active then
2631 Error_Msg_N ("missing proper body", N);
2633 end Check_Stub_Level;
2635 ------------------------
2636 -- Expand_With_Clause --
2637 ------------------------
2639 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2640 Loc : constant Source_Ptr := Sloc (Nam);
2641 Ent : constant Entity_Id := Entity (Nam);
2645 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2646 -- Comment requireed here ???
2648 ---------------------
2649 -- Build_Unit_Name --
2650 ---------------------
2652 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2653 Renaming : Entity_Id;
2657 if Nkind (Nam) = N_Identifier then
2659 -- If the parent unit P in the name of the with_clause for P.Q
2660 -- is a renaming of package R, then the entity of the parent is
2661 -- set to R, but the identifier retains Chars (P) to be consistent
2662 -- with the source (see details in lib-load). However, the
2663 -- implicit_with_clause for the parent must make the entity for
2664 -- P visible, because P.Q may be used as a prefix within the
2665 -- current unit. The entity for P is the current_entity with that
2666 -- name, because the package renaming declaration for it has just
2667 -- been analyzed. Note that this case can only happen if P.Q has
2668 -- already appeared in a previous with_clause in a related unit,
2669 -- such as the library body of the current unit.
2671 if Chars (Nam) /= Chars (Entity (Nam)) then
2672 Renaming := Current_Entity (Nam);
2673 pragma Assert (Renamed_Entity (Renaming) = Entity (Nam));
2674 return New_Occurrence_Of (Renaming, Loc);
2677 return New_Occurrence_Of (Entity (Nam), Loc);
2682 Make_Expanded_Name (Loc,
2683 Chars => Chars (Entity (Nam)),
2684 Prefix => Build_Unit_Name (Prefix (Nam)),
2685 Selector_Name => New_Occurrence_Of (Entity (Nam), Loc));
2686 Set_Entity (Result, Entity (Nam));
2689 end Build_Unit_Name;
2691 -- Start of processing for Expand_With_Clause
2694 New_Nodes_OK := New_Nodes_OK + 1;
2696 Make_With_Clause (Loc, Name => Build_Unit_Name (Nam));
2698 P := Parent (Unit_Declaration_Node (Ent));
2699 Set_Library_Unit (Withn, P);
2700 Set_Corresponding_Spec (Withn, Ent);
2701 Set_First_Name (Withn, True);
2702 Set_Implicit_With (Withn, True);
2704 -- If the unit is a package declaration, a private_with_clause on a
2705 -- child unit implies that the implicit with on the parent is also
2708 if Nkind (Unit (N)) = N_Package_Declaration then
2709 Set_Private_Present (Withn, Private_Present (Item));
2712 Prepend (Withn, Context_Items (N));
2713 Mark_Rewrite_Insertion (Withn);
2714 Install_Withed_Unit (Withn);
2716 if Nkind (Nam) = N_Expanded_Name then
2717 Expand_With_Clause (Item, Prefix (Nam), N);
2720 New_Nodes_OK := New_Nodes_OK - 1;
2721 end Expand_With_Clause;
2723 -----------------------
2724 -- Get_Parent_Entity --
2725 -----------------------
2727 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2729 if Nkind (Unit) = N_Package_Body
2730 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2734 (Specification (Instance_Spec (Original_Node (Unit))));
2736 elsif Nkind (Unit) = N_Package_Instantiation then
2737 return Defining_Entity (Specification (Instance_Spec (Unit)));
2740 return Defining_Entity (Unit);
2742 end Get_Parent_Entity;
2744 -----------------------------
2745 -- Implicit_With_On_Parent --
2746 -----------------------------
2748 procedure Implicit_With_On_Parent
2749 (Child_Unit : Node_Id;
2752 Loc : constant Source_Ptr := Sloc (N);
2753 P : constant Node_Id := Parent_Spec (Child_Unit);
2754 P_Unit : Node_Id := Unit (P);
2755 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
2758 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
2759 -- Build prefix of child unit name. Recurse if needed
2761 function Build_Unit_Name return Node_Id;
2762 -- If the unit is a child unit, build qualified name with all ancestors
2764 -------------------------
2765 -- Build_Ancestor_Name --
2766 -------------------------
2768 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
2769 P_Ref : constant Node_Id :=
2770 New_Reference_To (Defining_Entity (P), Loc);
2771 P_Spec : Node_Id := P;
2774 -- Ancestor may have been rewritten as a package body. Retrieve
2775 -- the original spec to trace earlier ancestors.
2777 if Nkind (P) = N_Package_Body
2778 and then Nkind (Original_Node (P)) = N_Package_Instantiation
2780 P_Spec := Original_Node (P);
2783 if No (Parent_Spec (P_Spec)) then
2787 Make_Selected_Component (Loc,
2788 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
2789 Selector_Name => P_Ref);
2791 end Build_Ancestor_Name;
2793 ---------------------
2794 -- Build_Unit_Name --
2795 ---------------------
2797 function Build_Unit_Name return Node_Id is
2800 if No (Parent_Spec (P_Unit)) then
2801 return New_Reference_To (P_Name, Loc);
2804 Make_Expanded_Name (Loc,
2805 Chars => Chars (P_Name),
2806 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
2807 Selector_Name => New_Reference_To (P_Name, Loc));
2808 Set_Entity (Result, P_Name);
2811 end Build_Unit_Name;
2813 -- Start of processing for Implicit_With_On_Parent
2816 -- The unit of the current compilation may be a package body that
2817 -- replaces an instance node. In this case we need the original instance
2818 -- node to construct the proper parent name.
2820 if Nkind (P_Unit) = N_Package_Body
2821 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
2823 P_Unit := Original_Node (P_Unit);
2826 -- We add the implicit with if the child unit is the current unit being
2827 -- compiled. If the current unit is a body, we do not want to add an
2828 -- implicit_with a second time to the corresponding spec.
2830 if Nkind (Child_Unit) = N_Package_Declaration
2831 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
2836 New_Nodes_OK := New_Nodes_OK + 1;
2837 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
2839 Set_Library_Unit (Withn, P);
2840 Set_Corresponding_Spec (Withn, P_Name);
2841 Set_First_Name (Withn, True);
2842 Set_Implicit_With (Withn, True);
2844 -- Node is placed at the beginning of the context items, so that
2845 -- subsequent use clauses on the parent can be validated.
2847 Prepend (Withn, Context_Items (N));
2848 Mark_Rewrite_Insertion (Withn);
2849 Install_Withed_Unit (Withn);
2851 if Is_Child_Spec (P_Unit) then
2852 Implicit_With_On_Parent (P_Unit, N);
2855 New_Nodes_OK := New_Nodes_OK - 1;
2856 end Implicit_With_On_Parent;
2862 function In_Chain (E : Entity_Id) return Boolean is
2866 H := Current_Entity (E);
2867 while Present (H) loop
2878 ---------------------
2879 -- Install_Context --
2880 ---------------------
2882 procedure Install_Context (N : Node_Id) is
2883 Lib_Unit : constant Node_Id := Unit (N);
2886 Install_Context_Clauses (N);
2888 if Is_Child_Spec (Lib_Unit) then
2889 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
2892 Install_Limited_Context_Clauses (N);
2894 end Install_Context;
2896 -----------------------------
2897 -- Install_Context_Clauses --
2898 -----------------------------
2900 procedure Install_Context_Clauses (N : Node_Id) is
2901 Lib_Unit : constant Node_Id := Unit (N);
2903 Uname_Node : Entity_Id;
2904 Check_Private : Boolean := False;
2905 Decl_Node : Node_Id;
2906 Lib_Parent : Entity_Id;
2909 -- First skip configuration pragmas at the start of the context. They
2910 -- are not technically part of the context clause, but that's where the
2911 -- parser puts them. Note they were analyzed in Analyze_Context.
2913 Item := First (Context_Items (N));
2914 while Present (Item)
2915 and then Nkind (Item) = N_Pragma
2916 and then Chars (Item) in Configuration_Pragma_Names
2921 -- Loop through the actual context clause items. We process everything
2922 -- except Limited_With clauses in this routine. Limited_With clauses
2923 -- are separately installed (see Install_Limited_Context_Clauses).
2925 while Present (Item) loop
2927 -- Case of explicit WITH clause
2929 if Nkind (Item) = N_With_Clause
2930 and then not Implicit_With (Item)
2932 if Limited_Present (Item) then
2934 -- Limited withed units will be installed later
2938 -- If Name (Item) is not an entity name, something is wrong, and
2939 -- this will be detected in due course, for now ignore the item
2941 elsif not Is_Entity_Name (Name (Item)) then
2944 elsif No (Entity (Name (Item))) then
2945 Set_Entity (Name (Item), Any_Id);
2949 Uname_Node := Entity (Name (Item));
2951 if Is_Private_Descendant (Uname_Node) then
2952 Check_Private := True;
2955 Install_Withed_Unit (Item);
2957 Decl_Node := Unit_Declaration_Node (Uname_Node);
2959 -- If the unit is a subprogram instance, it appears nested within
2960 -- a package that carries the parent information.
2962 if Is_Generic_Instance (Uname_Node)
2963 and then Ekind (Uname_Node) /= E_Package
2965 Decl_Node := Parent (Parent (Decl_Node));
2968 if Is_Child_Spec (Decl_Node) then
2969 if Nkind (Name (Item)) = N_Expanded_Name then
2970 Expand_With_Clause (Item, Prefix (Name (Item)), N);
2972 -- If not an expanded name, the child unit must be a
2973 -- renaming, nothing to do.
2978 elsif Nkind (Decl_Node) = N_Subprogram_Body
2979 and then not Acts_As_Spec (Parent (Decl_Node))
2980 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
2982 Implicit_With_On_Parent
2983 (Unit (Library_Unit (Parent (Decl_Node))), N);
2986 -- Check license conditions unless this is a dummy unit
2988 if Sloc (Library_Unit (Item)) /= No_Location then
2989 License_Check : declare
2991 Withu : constant Unit_Number_Type :=
2992 Get_Source_Unit (Library_Unit (Item));
2994 Withl : constant License_Type :=
2995 License (Source_Index (Withu));
2997 Unitl : constant License_Type :=
2998 License (Source_Index (Current_Sem_Unit));
3000 procedure License_Error;
3001 -- Signal error of bad license
3007 procedure License_Error is
3010 ("?license of with'ed unit & may be inconsistent",
3014 -- Start of processing for License_Check
3017 -- Exclude license check if withed unit is an internal unit.
3018 -- This situation arises e.g. with the GPL version of GNAT.
3020 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3023 -- Otherwise check various cases
3035 if Withl = Restricted then
3039 when Modified_GPL =>
3040 if Withl = Restricted or else Withl = GPL then
3044 when Unrestricted =>
3051 -- Case of USE PACKAGE clause
3053 elsif Nkind (Item) = N_Use_Package_Clause then
3054 Analyze_Use_Package (Item);
3056 -- Case of USE TYPE clause
3058 elsif Nkind (Item) = N_Use_Type_Clause then
3059 Analyze_Use_Type (Item);
3063 elsif Nkind (Item) = N_Pragma then
3071 if Is_Child_Spec (Lib_Unit) then
3073 -- The unit also has implicit withs on its own parents
3075 if No (Context_Items (N)) then
3076 Set_Context_Items (N, New_List);
3079 Implicit_With_On_Parent (Lib_Unit, N);
3082 -- If the unit is a body, the context of the specification must also
3085 if Nkind (Lib_Unit) = N_Package_Body
3086 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3087 and then not Acts_As_Spec (N))
3089 Install_Context (Library_Unit (N));
3091 if Is_Child_Spec (Unit (Library_Unit (N))) then
3093 -- If the unit is the body of a public child unit, the private
3094 -- declarations of the parent must be made visible. If the child
3095 -- unit is private, the private declarations have been installed
3096 -- already in the call to Install_Parents for the spec. Installing
3097 -- private declarations must be done for all ancestors of public
3098 -- child units. In addition, sibling units mentioned in the
3099 -- context clause of the body are directly visible.
3107 Lib_Spec := Unit (Library_Unit (N));
3108 while Is_Child_Spec (Lib_Spec) loop
3109 P := Unit (Parent_Spec (Lib_Spec));
3110 P_Name := Defining_Entity (P);
3112 if not (Private_Present (Parent (Lib_Spec)))
3113 and then not In_Private_Part (P_Name)
3115 Install_Private_Declarations (P_Name);
3116 Install_Private_With_Clauses (P_Name);
3117 Set_Use (Private_Declarations (Specification (P)));
3125 -- For a package body, children in context are immediately visible
3127 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3130 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3131 N_Generic_Subprogram_Declaration,
3132 N_Package_Declaration,
3133 N_Subprogram_Declaration)
3135 if Is_Child_Spec (Lib_Unit) then
3136 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3137 Set_Is_Private_Descendant
3138 (Defining_Entity (Lib_Unit),
3139 Is_Private_Descendant (Lib_Parent)
3140 or else Private_Present (Parent (Lib_Unit)));
3143 Set_Is_Private_Descendant
3144 (Defining_Entity (Lib_Unit),
3145 Private_Present (Parent (Lib_Unit)));
3149 if Check_Private then
3150 Check_Private_Child_Unit (N);
3152 end Install_Context_Clauses;
3154 -------------------------------------
3155 -- Install_Limited_Context_Clauses --
3156 -------------------------------------
3158 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3161 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3162 -- Check that the unlimited view of a given compilation_unit is not
3163 -- already visible through "use + renamings".
3165 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3166 -- Check that if a limited_with clause of a given compilation_unit
3167 -- mentions a descendant of a private child of some library unit,
3168 -- then the given compilation_unit shall be the declaration of a
3169 -- private descendant of that library unit.
3171 procedure Expand_Limited_With_Clause
3172 (Comp_Unit : Node_Id;
3175 -- If a child unit appears in a limited_with clause, there are implicit
3176 -- limited_with clauses on all parents that are not already visible
3177 -- through a regular with clause. This procedure creates the implicit
3178 -- limited with_clauses for the parents and loads the corresponding
3179 -- units. The shadow entities are created when the inserted clause is
3180 -- analyzed. Implements Ada 2005 (AI-50217).
3182 ---------------------
3183 -- Check_Renamings --
3184 ---------------------
3186 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3195 pragma Assert (Nkind (W) = N_With_Clause);
3197 -- Protect the frontend against previous critical errors
3199 case Nkind (Unit (Library_Unit (W))) is
3200 when N_Subprogram_Declaration |
3201 N_Package_Declaration |
3202 N_Generic_Subprogram_Declaration |
3203 N_Generic_Package_Declaration =>
3210 -- Check "use + renamings"
3212 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3213 Spec := Specification (Unit (P));
3215 Item := First (Visible_Declarations (Spec));
3216 while Present (Item) loop
3218 -- Look only at use package clauses
3220 if Nkind (Item) = N_Use_Package_Clause then
3222 -- Traverse the list of packages
3224 Nam := First (Names (Item));
3225 while Present (Nam) loop
3228 pragma Assert (Present (Parent (E)));
3230 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3231 and then Renamed_Entity (E) = WEnt
3233 -- The unlimited view is visible through use clause and
3234 -- renamings. There is not need to generate the error
3235 -- message here because Is_Visible_Through_Renamings
3236 -- takes care of generating the precise error message.
3240 elsif Nkind (Parent (E)) = N_Package_Specification then
3242 -- The use clause may refer to a local package.
3243 -- Check all the enclosing scopes.
3246 while E2 /= Standard_Standard
3254 ("unlimited view visible through use clause ", W);
3266 -- Recursive call to check all the ancestors
3268 if Is_Child_Spec (Unit (P)) then
3269 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3271 end Check_Renamings;
3273 ---------------------------------------
3274 -- Check_Private_Limited_Withed_Unit --
3275 ---------------------------------------
3277 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3278 Curr_Parent : Node_Id;
3279 Child_Parent : Node_Id;
3282 -- Compilation unit of the parent of the withed library unit
3284 Child_Parent := Parent_Spec (Unit (Library_Unit (Item)));
3286 -- If the child unit is a public child, then locate its nearest
3287 -- private ancestor, if any; Child_Parent will then be set to
3288 -- the parent of that ancestor.
3290 if not Private_Present (Library_Unit (Item)) then
3291 while Present (Child_Parent)
3292 and then not Private_Present (Child_Parent)
3294 Child_Parent := Parent_Spec (Unit (Child_Parent));
3297 if No (Child_Parent) then
3301 Child_Parent := Parent_Spec (Unit (Child_Parent));
3304 -- Traverse all the ancestors of the current compilation
3305 -- unit to check if it is a descendant of named library unit.
3307 Curr_Parent := Parent (Item);
3308 while Present (Parent_Spec (Unit (Curr_Parent)))
3309 and then Curr_Parent /= Child_Parent
3311 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3314 if Curr_Parent /= Child_Parent then
3316 ("unit in with clause is private child unit!", Item);
3318 ("\current unit must also have parent&!",
3319 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3321 elsif not Private_Present (Parent (Item))
3322 and then not Private_Present (Item)
3323 and then not Nkind_In (Unit (Parent (Item)), N_Package_Body,
3328 ("current unit must also be private descendant of&",
3329 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3331 end Check_Private_Limited_Withed_Unit;
3333 --------------------------------
3334 -- Expand_Limited_With_Clause --
3335 --------------------------------
3337 procedure Expand_Limited_With_Clause
3338 (Comp_Unit : Node_Id;
3342 Loc : constant Source_Ptr := Sloc (Nam);
3343 Unum : Unit_Number_Type;
3346 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3347 -- Returns true if the context already includes a with_clause for
3348 -- this unit. If the with_clause is non-limited, the unit is fully
3349 -- visible and an implicit limited_with should not be created. If
3350 -- there is already a limited_with clause for W, a second one is
3351 -- simply redundant.
3353 --------------------------
3354 -- Previous_Withed_Unit --
3355 --------------------------
3357 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3361 -- A limited with_clause cannot appear in the same context_clause
3362 -- as a nonlimited with_clause which mentions the same library.
3364 Item := First (Context_Items (Comp_Unit));
3365 while Present (Item) loop
3366 if Nkind (Item) = N_With_Clause
3367 and then Library_Unit (Item) = Library_Unit (W)
3376 end Previous_Withed_Unit;
3378 -- Start of processing for Expand_Limited_With_Clause
3381 New_Nodes_OK := New_Nodes_OK + 1;
3383 if Nkind (Nam) = N_Identifier then
3385 -- Create node for name of withed unit
3388 Make_With_Clause (Loc,
3389 Name => New_Copy (Nam));
3391 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3393 Make_With_Clause (Loc,
3394 Name => Make_Selected_Component (Loc,
3395 Prefix => New_Copy_Tree (Prefix (Nam)),
3396 Selector_Name => New_Copy (Selector_Name (Nam))));
3397 Set_Parent (Withn, Parent (N));
3400 Set_Limited_Present (Withn);
3401 Set_First_Name (Withn);
3402 Set_Implicit_With (Withn);
3406 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3411 -- Do not generate a limited_with_clause on the current unit.
3412 -- This path is taken when a unit has a limited_with clause on
3413 -- one of its child units.
3415 if Unum = Current_Sem_Unit then
3419 Set_Library_Unit (Withn, Cunit (Unum));
3420 Set_Corresponding_Spec
3421 (Withn, Specification (Unit (Cunit (Unum))));
3423 if not Previous_Withed_Unit (Withn) then
3424 Prepend (Withn, Context_Items (Parent (N)));
3425 Mark_Rewrite_Insertion (Withn);
3427 -- Add implicit limited_with_clauses for parents of child units
3428 -- mentioned in limited_with clauses.
3430 if Nkind (Nam) = N_Selected_Component then
3431 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3436 if not Limited_View_Installed (Withn) then
3437 Install_Limited_Withed_Unit (Withn);
3441 New_Nodes_OK := New_Nodes_OK - 1;
3442 end Expand_Limited_With_Clause;
3444 -- Start of processing for Install_Limited_Context_Clauses
3447 Item := First (Context_Items (N));
3448 while Present (Item) loop
3449 if Nkind (Item) = N_With_Clause
3450 and then Limited_Present (Item)
3452 if Nkind (Name (Item)) = N_Selected_Component then
3453 Expand_Limited_With_Clause
3454 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3457 Check_Private_Limited_Withed_Unit (Item);
3459 if not Implicit_With (Item)
3460 and then Is_Child_Spec (Unit (N))
3462 Check_Renamings (Parent_Spec (Unit (N)), Item);
3465 -- A unit may have a limited with on itself if it has a limited
3466 -- with_clause on one of its child units. In that case it is
3467 -- already being compiled and it makes no sense to install its
3470 -- If the item is a limited_private_with_clause, install it if the
3471 -- current unit is a body or if it is a private child. Otherwise
3472 -- the private clause is installed before analyzing the private
3473 -- part of the current unit.
3475 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3476 and then not Limited_View_Installed (Item)
3478 if not Private_Present (Item)
3479 or else Private_Present (N)
3480 or else Nkind_In (Unit (N), N_Package_Body,
3484 Install_Limited_Withed_Unit (Item);
3488 -- All items other than Limited_With clauses are ignored (they were
3489 -- installed separately early on by Install_Context_Clause).
3498 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3499 -- spec, looking for incomplete subtype declarations of incomplete
3500 -- types visible through a limited with clause.
3502 if Ada_Version >= Ada_05
3503 and then Analyzed (N)
3504 and then Nkind (Unit (N)) = N_Package_Declaration
3509 Non_Lim_View : Entity_Id;
3512 Decl := First (Visible_Declarations (Specification (Unit (N))));
3513 while Present (Decl) loop
3514 if Nkind (Decl) = N_Subtype_Declaration
3516 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3518 From_With_Type (Defining_Identifier (Decl))
3520 Def_Id := Defining_Identifier (Decl);
3521 Non_Lim_View := Non_Limited_View (Def_Id);
3523 if not Is_Incomplete_Type (Non_Lim_View) then
3525 -- Convert an incomplete subtype declaration into a
3526 -- corresponding non-limited view subtype declaration.
3527 -- This is usually the case when analyzing a body that
3528 -- has regular with-clauses, when the spec has limited
3531 -- If the non-limited view is still incomplete, it is
3532 -- the dummy entry already created, and the declaration
3533 -- cannot be reanalyzed. This is the case when installing
3534 -- a parent unit that has limited with-clauses.
3536 Set_Subtype_Indication (Decl,
3537 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3538 Set_Etype (Def_Id, Non_Lim_View);
3539 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3540 Set_Analyzed (Decl, False);
3542 -- Reanalyze the declaration, suppressing the call to
3543 -- Enter_Name to avoid duplicate names.
3545 Analyze_Subtype_Declaration
3555 end Install_Limited_Context_Clauses;
3557 ---------------------
3558 -- Install_Parents --
3559 ---------------------
3561 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3568 P := Unit (Parent_Spec (Lib_Unit));
3569 P_Name := Get_Parent_Entity (P);
3571 if Etype (P_Name) = Any_Type then
3575 if Ekind (P_Name) = E_Generic_Package
3576 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3577 N_Generic_Package_Declaration)
3578 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3581 ("child of a generic package must be a generic unit", Lib_Unit);
3583 elsif not Is_Package_Or_Generic_Package (P_Name) then
3585 ("parent unit must be package or generic package", Lib_Unit);
3586 raise Unrecoverable_Error;
3588 elsif Present (Renamed_Object (P_Name)) then
3589 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3590 raise Unrecoverable_Error;
3592 -- Verify that a child of an instance is itself an instance, or the
3593 -- renaming of one. Given that an instance that is a unit is replaced
3594 -- with a package declaration, check against the original node. The
3595 -- parent may be currently being instantiated, in which case it appears
3596 -- as a declaration, but the generic_parent is already established
3597 -- indicating that we deal with an instance.
3599 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3600 if Nkind (Lib_Unit) in N_Renaming_Declaration
3601 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3603 (Nkind (Lib_Unit) = N_Package_Declaration
3604 and then Present (Generic_Parent (Specification (Lib_Unit))))
3609 ("child of an instance must be an instance or renaming",
3614 -- This is the recursive call that ensures all parents are loaded
3616 if Is_Child_Spec (P) then
3618 Is_Private or else Private_Present (Parent (Lib_Unit)));
3621 -- Now we can install the context for this parent
3623 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3624 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3625 Install_Siblings (P_Name, Parent (Lib_Unit));
3627 -- The child unit is in the declarative region of the parent. The parent
3628 -- must therefore appear in the scope stack and be visible, as when
3629 -- compiling the corresponding body. If the child unit is private or it
3630 -- is a package body, private declarations must be accessible as well.
3631 -- Use declarations in the parent must also be installed. Finally, other
3632 -- child units of the same parent that are in the context are
3633 -- immediately visible.
3635 -- Find entity for compilation unit, and set its private descendant
3636 -- status as needed.
3638 E_Name := Defining_Entity (Lib_Unit);
3640 Set_Is_Child_Unit (E_Name);
3642 Set_Is_Private_Descendant (E_Name,
3643 Is_Private_Descendant (P_Name)
3644 or else Private_Present (Parent (Lib_Unit)));
3646 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3647 Push_Scope (P_Name);
3649 -- Save current visibility of unit
3651 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3652 Is_Immediately_Visible (P_Name);
3653 Set_Is_Immediately_Visible (P_Name);
3654 Install_Visible_Declarations (P_Name);
3655 Set_Use (Visible_Declarations (P_Spec));
3657 -- If the parent is a generic unit, its formal part may contain formal
3658 -- packages and use clauses for them.
3660 if Ekind (P_Name) = E_Generic_Package then
3661 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3665 or else Private_Present (Parent (Lib_Unit))
3667 Install_Private_Declarations (P_Name);
3668 Install_Private_With_Clauses (P_Name);
3669 Set_Use (Private_Declarations (P_Spec));
3671 end Install_Parents;
3673 ----------------------------------
3674 -- Install_Private_With_Clauses --
3675 ----------------------------------
3677 procedure Install_Private_With_Clauses (P : Entity_Id) is
3678 Decl : constant Node_Id := Unit_Declaration_Node (P);
3682 if Debug_Flag_I then
3683 Write_Str ("install private with clauses of ");
3684 Write_Name (Chars (P));
3688 if Nkind (Parent (Decl)) = N_Compilation_Unit then
3689 Item := First (Context_Items (Parent (Decl)));
3690 while Present (Item) loop
3691 if Nkind (Item) = N_With_Clause
3692 and then Private_Present (Item)
3694 if Limited_Present (Item) then
3695 if not Limited_View_Installed (Item) then
3696 Install_Limited_Withed_Unit (Item);
3699 Install_Withed_Unit (Item, Private_With_OK => True);
3706 end Install_Private_With_Clauses;
3708 ----------------------
3709 -- Install_Siblings --
3710 ----------------------
3712 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
3717 -- Iterate over explicit with clauses, and check whether the scope of
3718 -- each entity is an ancestor of the current unit, in which case it is
3719 -- immediately visible.
3721 Item := First (Context_Items (N));
3722 while Present (Item) loop
3724 -- Do not install private_with_clauses if the unit is a package
3725 -- declaration, unless it is itself a private child unit.
3727 if Nkind (Item) = N_With_Clause
3728 and then not Implicit_With (Item)
3729 and then not Limited_Present (Item)
3731 (not Private_Present (Item)
3732 or else Nkind (Unit (N)) /= N_Package_Declaration
3733 or else Private_Present (N))
3735 Id := Entity (Name (Item));
3737 if Is_Child_Unit (Id)
3738 and then Is_Ancestor_Package (Scope (Id), U_Name)
3740 Set_Is_Immediately_Visible (Id);
3742 -- Check for the presence of another unit in the context,
3743 -- that may be inadvertently hidden by the child.
3745 Prev := Current_Entity (Id);
3748 and then Is_Immediately_Visible (Prev)
3749 and then not Is_Child_Unit (Prev)
3755 Clause := First (Context_Items (N));
3756 while Present (Clause) loop
3757 if Nkind (Clause) = N_With_Clause
3758 and then Entity (Name (Clause)) = Prev
3761 ("child unit& hides compilation unit " &
3762 "with the same name?",
3772 -- The With_Clause may be on a grand-child or one of its further
3773 -- descendants, which makes a child immediately visible. Examine
3774 -- ancestry to determine whether such a child exists. For example,
3775 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
3776 -- is immediately visible.
3778 elsif Is_Child_Unit (Id) then
3784 while Is_Child_Unit (Par) loop
3785 if Is_Ancestor_Package (Scope (Par), U_Name) then
3786 Set_Is_Immediately_Visible (Par);
3798 end Install_Siblings;
3800 -------------------------------
3801 -- Install_Limited_With_Unit --
3802 -------------------------------
3804 procedure Install_Limited_Withed_Unit (N : Node_Id) is
3805 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
3808 Is_Child_Package : Boolean := False;
3809 Lim_Header : Entity_Id;
3810 Lim_Typ : Entity_Id;
3812 function Has_Limited_With_Clause
3813 (C_Unit : Entity_Id;
3814 Pack : Entity_Id) return Boolean;
3815 -- Determine whether any package in the ancestor chain starting with
3816 -- C_Unit has a limited with clause for package Pack.
3818 function Has_With_Clause
3821 Is_Limited : Boolean := False) return Boolean;
3822 -- Determine whether compilation unit C_Unit contains a with clause
3823 -- for package Pack. Use flag Is_Limited to designate desired clause
3824 -- kind. This is a subsidiary routine to Has_Limited_With_Clause.
3826 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
3827 -- Check if some package installed though normal with-clauses has a
3828 -- renaming declaration of package P. AARM 10.1.2(21/2).
3830 -----------------------------
3831 -- Has_Limited_With_Clause --
3832 -----------------------------
3834 function Has_Limited_With_Clause
3835 (C_Unit : Entity_Id;
3836 Pack : Entity_Id) return Boolean
3843 while Present (Par) loop
3844 if Ekind (Par) /= E_Package then
3848 -- Retrieve the Compilation_Unit node for Par and determine if
3849 -- its context clauses contain a limited with for Pack.
3851 Par_Unit := Parent (Parent (Parent (Par)));
3853 if Nkind (Par_Unit) = N_Package_Declaration then
3854 Par_Unit := Parent (Par_Unit);
3857 if Has_With_Clause (Par_Unit, Pack, True) then
3861 -- If there are more ancestors, climb up the tree, otherwise
3864 if Is_Child_Unit (Par) then
3872 end Has_Limited_With_Clause;
3874 ---------------------
3875 -- Has_With_Clause --
3876 ---------------------
3878 function Has_With_Clause
3881 Is_Limited : Boolean := False) return Boolean
3887 if Present (Context_Items (C_Unit)) then
3888 Item := First (Context_Items (C_Unit));
3889 while Present (Item) loop
3890 if Nkind (Item) = N_With_Clause then
3892 -- Retrieve the entity of the imported compilation unit
3894 if Nkind (Name (Item)) = N_Selected_Component then
3895 Nam := Entity (Selector_Name (Name (Item)));
3897 Nam := Entity (Name (Item));
3902 ((Is_Limited and then Limited_Present (Item))
3904 (not Is_Limited and then not Limited_Present (Item)))
3915 end Has_With_Clause;
3917 ----------------------------------
3918 -- Is_Visible_Through_Renamings --
3919 ----------------------------------
3921 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
3922 Kind : constant Node_Kind :=
3923 Nkind (Unit (Cunit (Current_Sem_Unit)));
3929 -- Example of the error detected by this subprogram:
3937 -- package Ren_P renames P;
3943 -- limited with P; -- ERROR
3944 -- package R.C is ...
3946 Aux_Unit := Cunit (Current_Sem_Unit);
3949 Item := First (Context_Items (Aux_Unit));
3950 while Present (Item) loop
3951 if Nkind (Item) = N_With_Clause
3952 and then not Limited_Present (Item)
3953 and then Nkind (Unit (Library_Unit (Item)))
3954 = N_Package_Declaration
3957 First (Visible_Declarations
3958 (Specification (Unit (Library_Unit (Item)))));
3959 while Present (Decl) loop
3960 if Nkind (Decl) = N_Package_Renaming_Declaration
3961 and then Entity (Name (Decl)) = P
3963 -- Generate the error message only if the current unit
3964 -- is a package declaration; in case of subprogram
3965 -- bodies and package bodies we just return true to
3966 -- indicate that the limited view must not be
3969 if Kind = N_Package_Declaration then
3971 ("simultaneous visibility of the limited and " &
3972 "unlimited views not allowed", N);
3973 Error_Msg_Sloc := Sloc (Item);
3975 ("\\ unlimited view of & visible through the " &
3976 "context clause #", N, P);
3977 Error_Msg_Sloc := Sloc (Decl);
3978 Error_Msg_NE ("\\ and the renaming #", N, P);
3991 if Present (Library_Unit (Aux_Unit)) then
3992 if Aux_Unit = Library_Unit (Aux_Unit) then
3994 -- Aux_Unit is a body that acts as a spec. Clause has
3995 -- already been flagged as illegal.
4000 Aux_Unit := Library_Unit (Aux_Unit);
4003 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4006 exit when No (Aux_Unit);
4010 end Is_Visible_Through_Renamings;
4012 -- Start of processing for Install_Limited_Withed_Unit
4015 pragma Assert (not Limited_View_Installed (N));
4017 -- In case of limited with_clause on subprograms, generics, instances,
4018 -- or renamings, the corresponding error was previously posted and we
4019 -- have nothing to do here.
4021 if Nkind (P_Unit) /= N_Package_Declaration then
4025 P := Defining_Unit_Name (Specification (P_Unit));
4027 -- Handle child packages
4029 if Nkind (P) = N_Defining_Program_Unit_Name then
4030 Is_Child_Package := True;
4031 P := Defining_Identifier (P);
4034 -- Do not install the limited-view if the full-view is already visible
4035 -- through renaming declarations.
4037 if Is_Visible_Through_Renamings (P) then
4041 -- Do not install the limited view if this is the unit being analyzed.
4042 -- This unusual case will happen when a unit has a limited_with clause
4043 -- on one of its children. The compilation of the child forces the
4044 -- load of the parent which tries to install the limited view of the
4045 -- child again. Installing the limited view must also be disabled
4046 -- when compiling the body of the child unit.
4048 if P = Cunit_Entity (Current_Sem_Unit)
4050 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4051 and then P = Main_Unit_Entity)
4056 -- This scenario is similar to the one above, the difference is that
4057 -- the compilation of sibling Par.Sib forces the load of parent Par
4058 -- which tries to install the limited view of Lim_Pack [1]. However
4059 -- Par.Sib has a with clause for Lim_Pack [2] in its body, and thus
4060 -- needs the non-limited views of all entities from Lim_Pack.
4062 -- limited with Lim_Pack; -- [1]
4063 -- package Par is ... package Lim_Pack is ...
4065 -- with Lim_Pack; -- [2]
4066 -- package Par.Sib is ... package body Par.Sib is ...
4068 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4069 -- Sem_Unit is the body of Par.Sib.
4071 if Ekind (P) = E_Package
4072 and then Ekind (Main_Unit_Entity) = E_Package
4073 and then Is_Child_Unit (Main_Unit_Entity)
4075 -- The body has a regular with clause
4077 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4078 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4080 -- One of the ancestors has a limited with clause
4082 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4083 N_Package_Specification
4084 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4089 -- A common use of the limited-with is to have a limited-with
4090 -- in the package spec, and a normal with in its package body.
4093 -- limited with X; -- [1]
4097 -- package body A is ...
4099 -- The compilation of A's body installs the context clauses found at [2]
4100 -- and then the context clauses of its specification (found at [1]). As
4101 -- a consequence, at [1] the specification of X has been analyzed and it
4102 -- is immediately visible. According to the semantics of limited-with
4103 -- context clauses we don't install the limited view because the full
4104 -- view of X supersedes its limited view.
4106 if Analyzed (P_Unit)
4107 and then (Is_Immediately_Visible (P)
4108 or else (Is_Child_Package
4109 and then Is_Visible_Child_Unit (P)))
4111 -- Ada 2005 (AI-262): Install the private declarations of P
4113 if Private_Present (N)
4114 and then not In_Private_Part (P)
4120 Id := First_Private_Entity (P);
4121 while Present (Id) loop
4122 if not Is_Internal (Id)
4123 and then not Is_Child_Unit (Id)
4125 if not In_Chain (Id) then
4126 Set_Homonym (Id, Current_Entity (Id));
4127 Set_Current_Entity (Id);
4130 Set_Is_Immediately_Visible (Id);
4136 Set_In_Private_Part (P);
4143 if Debug_Flag_I then
4144 Write_Str ("install limited view of ");
4145 Write_Name (Chars (P));
4149 -- If the unit has not been analyzed and the limited view has not been
4150 -- already installed then we install it.
4152 if not Analyzed (P_Unit) then
4153 if not In_Chain (P) then
4155 -- Minimum decoration
4157 Set_Ekind (P, E_Package);
4158 Set_Etype (P, Standard_Void_Type);
4159 Set_Scope (P, Standard_Standard);
4161 if Is_Child_Package then
4162 Set_Is_Child_Unit (P);
4163 Set_Is_Visible_Child_Unit (P);
4164 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4167 -- Place entity on visibility structure
4169 Set_Homonym (P, Current_Entity (P));
4170 Set_Current_Entity (P);
4172 if Debug_Flag_I then
4173 Write_Str (" (homonym) chain ");
4174 Write_Name (Chars (P));
4178 -- Install the incomplete view. The first element of the limited
4179 -- view is a header (an E_Package entity) used to reference the
4180 -- first shadow entity in the private part of the package.
4182 Lim_Header := Limited_View (P);
4183 Lim_Typ := First_Entity (Lim_Header);
4185 while Present (Lim_Typ)
4186 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4188 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4189 Set_Current_Entity (Lim_Typ);
4191 if Debug_Flag_I then
4192 Write_Str (" (homonym) chain ");
4193 Write_Name (Chars (Lim_Typ));
4197 Next_Entity (Lim_Typ);
4201 -- If the unit appears in a previous regular with_clause, the regular
4202 -- entities of the public part of the withed package must be replaced
4203 -- by the shadow ones.
4205 -- This code must be kept synchronized with the code that replaces the
4206 -- shadow entities by the real entities (see body of Remove_Limited
4207 -- With_Clause); otherwise the contents of the homonym chains are not
4211 -- Hide all the type entities of the public part of the package to
4212 -- avoid its usage. This is needed to cover all the subtype decla-
4213 -- rations because we do not remove them from the homonym chain.
4215 E := First_Entity (P);
4216 while Present (E) and then E /= First_Private_Entity (P) loop
4218 Set_Was_Hidden (E, Is_Hidden (E));
4225 -- Replace the real entities by the shadow entities of the limited
4226 -- view. The first element of the limited view is a header that is
4227 -- used to reference the first shadow entity in the private part
4228 -- of the package. Successive elements are the limited views of the
4229 -- type (including regular incomplete types) declared in the package.
4231 Lim_Header := Limited_View (P);
4233 Lim_Typ := First_Entity (Lim_Header);
4234 while Present (Lim_Typ)
4235 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4237 pragma Assert (not In_Chain (Lim_Typ));
4239 -- Do not unchain nested packages and child units
4241 if Ekind (Lim_Typ) /= E_Package
4242 and then not Is_Child_Unit (Lim_Typ)
4248 Prev := Current_Entity (Lim_Typ);
4251 -- Replace E in the homonyms list, so that the limited
4252 -- view becomes available.
4254 if E = Non_Limited_View (Lim_Typ) then
4255 Set_Homonym (Lim_Typ, Homonym (Prev));
4256 Set_Current_Entity (Lim_Typ);
4260 E := Homonym (Prev);
4262 -- E may have been removed when installing a
4263 -- previous limited_with_clause.
4267 exit when E = Non_Limited_View (Lim_Typ);
4269 Prev := Homonym (Prev);
4273 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4274 Set_Homonym (Prev, Lim_Typ);
4279 if Debug_Flag_I then
4280 Write_Str (" (homonym) chain ");
4281 Write_Name (Chars (Lim_Typ));
4286 Next_Entity (Lim_Typ);
4290 -- The package must be visible while the limited-with clause is active
4291 -- because references to the type P.T must resolve in the usual way.
4292 -- In addition, we remember that the limited-view has been installed to
4293 -- uninstall it at the point of context removal.
4295 Set_Is_Immediately_Visible (P);
4296 Set_Limited_View_Installed (N);
4298 -- If the package in the limited_with clause is a child unit, the
4299 -- clause is unanalyzed and appears as a selected component. Recast
4300 -- it as an expanded name so that the entity can be properly set. Use
4301 -- entity of parent, if available, for higher ancestors in the name.
4303 if Nkind (Name (N)) = N_Selected_Component then
4311 while Nkind (Nam) = N_Selected_Component
4312 and then Present (Ent)
4314 Change_Selected_Component_To_Expanded_Name (Nam);
4316 -- Set entity of parent identifiers if the unit is a child
4317 -- unit. This ensures that the tree is properly formed from
4318 -- semantic point of view (e.g. for ASIS queries).
4320 Set_Entity (Nam, Ent);
4322 Nam := Prefix (Nam);
4325 -- Set entity of last ancestor
4327 if Nkind (Nam) = N_Identifier then
4328 Set_Entity (Nam, Ent);
4334 Set_Entity (Name (N), P);
4335 Set_From_With_Type (P);
4336 end Install_Limited_Withed_Unit;
4338 -------------------------
4339 -- Install_Withed_Unit --
4340 -------------------------
4342 procedure Install_Withed_Unit
4343 (With_Clause : Node_Id;
4344 Private_With_OK : Boolean := False)
4346 Uname : constant Entity_Id := Entity (Name (With_Clause));
4347 P : constant Entity_Id := Scope (Uname);
4350 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4351 -- compiling a package declaration and the Private_With_OK flag was not
4352 -- set by the caller. These declarations will be installed later (before
4353 -- analyzing the private part of the package).
4355 if Private_Present (With_Clause)
4356 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
4357 and then not (Private_With_OK)
4362 if Debug_Flag_I then
4363 if Private_Present (With_Clause) then
4364 Write_Str ("install private withed unit ");
4366 Write_Str ("install withed unit ");
4369 Write_Name (Chars (Uname));
4373 -- We do not apply the restrictions to an internal unit unless
4374 -- we are compiling the internal unit as a main unit. This check
4375 -- is also skipped for dummy units (for missing packages).
4377 if Sloc (Uname) /= No_Location
4378 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
4379 or else Current_Sem_Unit = Main_Unit)
4381 Check_Restricted_Unit
4382 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
4385 if P /= Standard_Standard then
4387 -- If the unit is not analyzed after analysis of the with clause and
4388 -- it is an instantiation then it awaits a body and is the main unit.
4389 -- Its appearance in the context of some other unit indicates a
4390 -- circular dependency (DEC suite perversity).
4392 if not Analyzed (Uname)
4393 and then Nkind (Parent (Uname)) = N_Package_Instantiation
4396 ("instantiation depends on itself", Name (With_Clause));
4398 elsif not Is_Visible_Child_Unit (Uname) then
4399 Set_Is_Visible_Child_Unit (Uname);
4401 -- If the child unit appears in the context of its parent, it is
4402 -- immediately visible.
4404 if In_Open_Scopes (Scope (Uname)) then
4405 Set_Is_Immediately_Visible (Uname);
4408 if Is_Generic_Instance (Uname)
4409 and then Ekind (Uname) in Subprogram_Kind
4411 -- Set flag as well on the visible entity that denotes the
4412 -- instance, which renames the current one.
4414 Set_Is_Visible_Child_Unit
4416 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
4419 -- The parent unit may have been installed already, and may have
4420 -- appeared in a use clause.
4422 if In_Use (Scope (Uname)) then
4423 Set_Is_Potentially_Use_Visible (Uname);
4426 Set_Context_Installed (With_Clause);
4429 elsif not Is_Immediately_Visible (Uname) then
4430 if not Private_Present (With_Clause)
4431 or else Private_With_OK
4433 Set_Is_Immediately_Visible (Uname);
4436 Set_Context_Installed (With_Clause);
4439 -- A with-clause overrides a with-type clause: there are no restric-
4440 -- tions on the use of package entities.
4442 if Ekind (Uname) = E_Package then
4443 Set_From_With_Type (Uname, False);
4446 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4447 -- unit if there is a visible homograph for it declared in the same
4448 -- declarative region. This pathological case can only arise when an
4449 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4450 -- G1 has a generic child also named G2, and the context includes with_
4451 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4452 -- of I1.G2 visible as well. If the child unit is named Standard, do
4453 -- not apply the check to the Standard package itself.
4455 if Is_Child_Unit (Uname)
4456 and then Is_Visible_Child_Unit (Uname)
4457 and then Ada_Version >= Ada_05
4460 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
4466 U2 := Homonym (Uname);
4468 and then U2 /= Standard_Standard
4471 Decl2 := Unit_Declaration_Node (P2);
4473 if Is_Child_Unit (U2)
4474 and then Is_Visible_Child_Unit (U2)
4476 if Is_Generic_Instance (P)
4477 and then Nkind (Decl1) = N_Package_Declaration
4478 and then Generic_Parent (Specification (Decl1)) = P2
4480 Error_Msg_N ("illegal with_clause", With_Clause);
4482 ("\child unit has visible homograph" &
4483 " (RM 8.3(26), 10.1.1(19))",
4487 elsif Is_Generic_Instance (P2)
4488 and then Nkind (Decl2) = N_Package_Declaration
4489 and then Generic_Parent (Specification (Decl2)) = P
4491 -- With_clause for child unit of instance appears before
4492 -- in the context. We want to place the error message on
4493 -- it, not on the generic child unit itself.
4496 Prev_Clause : Node_Id;
4499 Prev_Clause := First (List_Containing (With_Clause));
4500 while Entity (Name (Prev_Clause)) /= U2 loop
4504 pragma Assert (Present (Prev_Clause));
4505 Error_Msg_N ("illegal with_clause", Prev_Clause);
4507 ("\child unit has visible homograph" &
4508 " (RM 8.3(26), 10.1.1(19))",
4519 end Install_Withed_Unit;
4525 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
4526 K : constant Node_Kind := Nkind (Lib_Unit);
4529 return (K in N_Generic_Declaration or else
4530 K in N_Generic_Instantiation or else
4531 K in N_Generic_Renaming_Declaration or else
4532 K = N_Package_Declaration or else
4533 K = N_Package_Renaming_Declaration or else
4534 K = N_Subprogram_Declaration or else
4535 K = N_Subprogram_Renaming_Declaration)
4536 and then Present (Parent_Spec (Lib_Unit));
4539 -----------------------
4540 -- Load_Needed_Body --
4541 -----------------------
4543 -- N is a generic unit named in a with clause, or else it is a unit that
4544 -- contains a generic unit or an inlined function. In order to perform an
4545 -- instantiation, the body of the unit must be present. If the unit itself
4546 -- is generic, we assume that an instantiation follows, and load & analyze
4547 -- the body unconditionally. This forces analysis of the spec as well.
4549 -- If the unit is not generic, but contains a generic unit, it is loaded on
4550 -- demand, at the point of instantiation (see ch12).
4552 procedure Load_Needed_Body (N : Node_Id; OK : out Boolean) is
4553 Body_Name : Unit_Name_Type;
4554 Unum : Unit_Number_Type;
4556 Save_Style_Check : constant Boolean := Opt.Style_Check;
4557 -- The loading and analysis is done with style checks off
4560 if not GNAT_Mode then
4561 Style_Check := False;
4564 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
4567 (Load_Name => Body_Name,
4573 if Unum = No_Unit then
4577 Compiler_State := Analyzing; -- reset after load
4579 if not Fatal_Error (Unum) or else Try_Semantics then
4580 if Debug_Flag_L then
4581 Write_Str ("*** Loaded generic body");
4585 Semantics (Cunit (Unum));
4591 Style_Check := Save_Style_Check;
4592 end Load_Needed_Body;
4594 -------------------------
4595 -- Build_Limited_Views --
4596 -------------------------
4598 procedure Build_Limited_Views (N : Node_Id) is
4599 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
4600 P : constant Entity_Id := Cunit_Entity (Unum);
4602 Spec : Node_Id; -- To denote a package specification
4603 Lim_Typ : Entity_Id; -- To denote shadow entities
4604 Comp_Typ : Entity_Id; -- To denote real entities
4606 Lim_Header : Entity_Id; -- Package entity
4607 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
4608 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
4610 procedure Decorate_Incomplete_Type
4613 -- Add attributes of an incomplete type to a shadow entity. The same
4614 -- attributes are placed on the real entity, so that gigi receives
4615 -- a consistent view.
4617 procedure Decorate_Package_Specification (P : Entity_Id);
4618 -- Add attributes of a package entity to the entity in a package
4621 procedure Decorate_Tagged_Type
4625 -- Set basic attributes of tagged type T, including its class_wide type.
4626 -- The parameters Loc, Scope are used to decorate the class_wide type.
4628 procedure Build_Chain
4630 First_Decl : Node_Id);
4631 -- Construct list of shadow entities and attach it to entity of
4632 -- package that is mentioned in a limited_with clause.
4634 function New_Internal_Shadow_Entity
4635 (Kind : Entity_Kind;
4636 Sloc_Value : Source_Ptr;
4637 Id_Char : Character) return Entity_Id;
4638 -- Build a new internal entity and append it to the list of shadow
4639 -- entities available through the limited-header
4641 ------------------------------
4642 -- Decorate_Incomplete_Type --
4643 ------------------------------
4645 procedure Decorate_Incomplete_Type
4650 Set_Ekind (E, E_Incomplete_Type);
4651 Set_Scope (E, Scop);
4653 Set_Is_First_Subtype (E, True);
4654 Set_Stored_Constraint (E, No_Elist);
4655 Set_Full_View (E, Empty);
4656 Init_Size_Align (E);
4657 end Decorate_Incomplete_Type;
4659 --------------------------
4660 -- Decorate_Tagged_Type --
4661 --------------------------
4663 procedure Decorate_Tagged_Type
4671 Decorate_Incomplete_Type (T, Scop);
4672 Set_Is_Tagged_Type (T);
4674 -- Build corresponding class_wide type, if not previously done
4676 -- Warning: The class-wide entity is shared by the limited-view
4677 -- and the full-view.
4679 if No (Class_Wide_Type (T)) then
4680 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S'));
4682 Set_Ekind (CW, E_Class_Wide_Type);
4684 Set_Scope (CW, Scop);
4685 Set_Is_Tagged_Type (CW);
4686 Set_Is_First_Subtype (CW, True);
4687 Init_Size_Align (CW);
4688 Set_Has_Unknown_Discriminants (CW, True);
4689 Set_Class_Wide_Type (CW, CW);
4690 Set_Equivalent_Type (CW, Empty);
4691 Set_From_With_Type (CW, From_With_Type (T));
4693 Set_Class_Wide_Type (T, CW);
4695 end Decorate_Tagged_Type;
4697 ------------------------------------
4698 -- Decorate_Package_Specification --
4699 ------------------------------------
4701 procedure Decorate_Package_Specification (P : Entity_Id) is
4703 -- Place only the most basic attributes
4705 Set_Ekind (P, E_Package);
4706 Set_Etype (P, Standard_Void_Type);
4707 end Decorate_Package_Specification;
4709 --------------------------------
4710 -- New_Internal_Shadow_Entity --
4711 --------------------------------
4713 function New_Internal_Shadow_Entity
4714 (Kind : Entity_Kind;
4715 Sloc_Value : Source_Ptr;
4716 Id_Char : Character) return Entity_Id
4718 E : constant Entity_Id :=
4719 Make_Defining_Identifier (Sloc_Value,
4720 Chars => New_Internal_Name (Id_Char));
4723 Set_Ekind (E, Kind);
4724 Set_Is_Internal (E, True);
4726 if Kind in Type_Kind then
4727 Init_Size_Align (E);
4730 Append_Entity (E, Lim_Header);
4733 end New_Internal_Shadow_Entity;
4739 procedure Build_Chain
4741 First_Decl : Node_Id)
4743 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
4744 Is_Tagged : Boolean;
4749 while Present (Decl) loop
4751 -- For each library_package_declaration in the environment, there
4752 -- is an implicit declaration of a *limited view* of that library
4753 -- package. The limited view of a package contains:
4755 -- * For each nested package_declaration, a declaration of the
4756 -- limited view of that package, with the same defining-
4757 -- program-unit name.
4759 -- * For each type_declaration in the visible part, an incomplete
4760 -- type-declaration with the same defining_identifier, whose
4761 -- completion is the type_declaration. If the type_declaration
4762 -- is tagged, then the incomplete_type_declaration is tagged
4765 -- The partial view is tagged if the declaration has the
4766 -- explicit keyword, or else if it is a type extension, both
4767 -- of which can be ascertained syntactically.
4769 if Nkind (Decl) = N_Full_Type_Declaration then
4771 (Nkind (Type_Definition (Decl)) = N_Record_Definition
4772 and then Tagged_Present (Type_Definition (Decl)))
4774 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
4777 (Record_Extension_Part (Type_Definition (Decl))));
4779 Comp_Typ := Defining_Identifier (Decl);
4781 if not Analyzed_Unit then
4783 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4785 Decorate_Incomplete_Type (Comp_Typ, Scope);
4789 -- Create shadow entity for type
4791 Lim_Typ := New_Internal_Shadow_Entity
4792 (Kind => Ekind (Comp_Typ),
4793 Sloc_Value => Sloc (Comp_Typ),
4796 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4797 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4798 Set_From_With_Type (Lim_Typ);
4801 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4803 Decorate_Incomplete_Type (Lim_Typ, Scope);
4806 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4808 elsif Nkind (Decl) = N_Private_Type_Declaration
4809 or else Nkind (Decl) = N_Incomplete_Type_Declaration
4811 Comp_Typ := Defining_Identifier (Decl);
4813 if not Analyzed_Unit then
4814 if Tagged_Present (Decl) then
4815 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4817 Decorate_Incomplete_Type (Comp_Typ, Scope);
4821 Lim_Typ := New_Internal_Shadow_Entity
4822 (Kind => Ekind (Comp_Typ),
4823 Sloc_Value => Sloc (Comp_Typ),
4826 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4827 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4828 Set_From_With_Type (Lim_Typ);
4830 if Tagged_Present (Decl) then
4831 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4833 Decorate_Incomplete_Type (Lim_Typ, Scope);
4836 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4838 elsif Nkind (Decl) = N_Private_Extension_Declaration then
4839 Comp_Typ := Defining_Identifier (Decl);
4841 if not Analyzed_Unit then
4842 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4845 -- Create shadow entity for type
4847 Lim_Typ := New_Internal_Shadow_Entity
4848 (Kind => Ekind (Comp_Typ),
4849 Sloc_Value => Sloc (Comp_Typ),
4852 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4853 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4854 Set_From_With_Type (Lim_Typ);
4856 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4857 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4859 elsif Nkind (Decl) = N_Package_Declaration then
4864 Spec : constant Node_Id := Specification (Decl);
4867 Comp_Typ := Defining_Unit_Name (Spec);
4869 if not Analyzed (Cunit (Unum)) then
4870 Decorate_Package_Specification (Comp_Typ);
4871 Set_Scope (Comp_Typ, Scope);
4874 Lim_Typ := New_Internal_Shadow_Entity
4875 (Kind => Ekind (Comp_Typ),
4876 Sloc_Value => Sloc (Comp_Typ),
4879 Decorate_Package_Specification (Lim_Typ);
4880 Set_Scope (Lim_Typ, Scope);
4882 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4883 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4884 Set_From_With_Type (Lim_Typ);
4886 -- Note: The non_limited_view attribute is not used
4887 -- for local packages.
4891 First_Decl => First (Visible_Declarations (Spec)));
4899 -- Start of processing for Build_Limited_Views
4902 pragma Assert (Limited_Present (N));
4904 -- A library_item mentioned in a limited_with_clause shall
4905 -- be a package_declaration, not a subprogram_declaration,
4906 -- generic_declaration, generic_instantiation, or
4907 -- package_renaming_declaration
4909 case Nkind (Unit (Library_Unit (N))) is
4911 when N_Package_Declaration =>
4914 when N_Subprogram_Declaration =>
4915 Error_Msg_N ("subprograms not allowed in "
4916 & "limited with_clauses", N);
4919 when N_Generic_Package_Declaration |
4920 N_Generic_Subprogram_Declaration =>
4921 Error_Msg_N ("generics not allowed in "
4922 & "limited with_clauses", N);
4925 when N_Generic_Instantiation =>
4926 Error_Msg_N ("generic instantiations not allowed in "
4927 & "limited with_clauses", N);
4930 when N_Generic_Renaming_Declaration =>
4931 Error_Msg_N ("generic renamings not allowed in "
4932 & "limited with_clauses", N);
4935 when N_Subprogram_Renaming_Declaration =>
4936 Error_Msg_N ("renamed subprograms not allowed in "
4937 & "limited with_clauses", N);
4940 when N_Package_Renaming_Declaration =>
4941 Error_Msg_N ("renamed packages not allowed in "
4942 & "limited with_clauses", N);
4946 raise Program_Error;
4949 -- Check if the chain is already built
4951 Spec := Specification (Unit (Library_Unit (N)));
4953 if Limited_View_Installed (Spec) then
4957 Set_Ekind (P, E_Package);
4959 -- Build the header of the limited_view
4961 Lim_Header := Make_Defining_Identifier (Sloc (N),
4962 Chars => New_Internal_Name (Id_Char => 'Z'));
4963 Set_Ekind (Lim_Header, E_Package);
4964 Set_Is_Internal (Lim_Header);
4965 Set_Limited_View (P, Lim_Header);
4967 -- Create the auxiliary chain. All the shadow entities are appended to
4968 -- the list of entities of the limited-view header
4972 First_Decl => First (Visible_Declarations (Spec)));
4974 -- Save the last built shadow entity. It is needed later to set the
4975 -- reference to the first shadow entity in the private part
4977 Last_Pub_Lim_E := Last_Lim_E;
4979 -- Ada 2005 (AI-262): Add the limited view of the private declarations
4980 -- Required to give support to limited-private-with clauses
4982 Build_Chain (Scope => P,
4983 First_Decl => First (Private_Declarations (Spec)));
4985 if Last_Pub_Lim_E /= Empty then
4986 Set_First_Private_Entity (Lim_Header,
4987 Next_Entity (Last_Pub_Lim_E));
4989 Set_First_Private_Entity (Lim_Header,
4993 Set_Limited_View_Installed (Spec);
4994 end Build_Limited_Views;
4996 -------------------------------
4997 -- Check_Body_Needed_For_SAL --
4998 -------------------------------
5000 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5002 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5003 -- Determine whether use of entity E might require the presence of its
5004 -- body. For a package this requires a recursive traversal of all nested
5007 ---------------------------
5008 -- Entity_Needed_For_SAL --
5009 ---------------------------
5011 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5015 if Is_Subprogram (E)
5016 and then Has_Pragma_Inline (E)
5020 elsif Ekind (E) = E_Generic_Function
5021 or else Ekind (E) = E_Generic_Procedure
5025 elsif Ekind (E) = E_Generic_Package
5027 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5028 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5032 elsif Ekind (E) = E_Package
5034 Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5035 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5037 Ent := First_Entity (E);
5038 while Present (Ent) loop
5039 if Entity_Needs_Body (Ent) then
5051 end Entity_Needs_Body;
5053 -- Start of processing for Check_Body_Needed_For_SAL
5056 if Ekind (Unit_Name) = E_Generic_Package
5058 Nkind (Unit_Declaration_Node (Unit_Name)) =
5059 N_Generic_Package_Declaration
5061 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5063 Set_Body_Needed_For_SAL (Unit_Name);
5065 elsif Ekind (Unit_Name) = E_Generic_Procedure
5066 or else Ekind (Unit_Name) = E_Generic_Function
5068 Set_Body_Needed_For_SAL (Unit_Name);
5070 elsif Is_Subprogram (Unit_Name)
5071 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5072 N_Subprogram_Declaration
5073 and then Has_Pragma_Inline (Unit_Name)
5075 Set_Body_Needed_For_SAL (Unit_Name);
5077 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5078 Check_Body_Needed_For_SAL
5079 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5081 elsif Ekind (Unit_Name) = E_Package
5082 and then Entity_Needs_Body (Unit_Name)
5084 Set_Body_Needed_For_SAL (Unit_Name);
5086 elsif Ekind (Unit_Name) = E_Package_Body
5087 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5089 Check_Body_Needed_For_SAL
5090 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5092 end Check_Body_Needed_For_SAL;
5094 --------------------
5095 -- Remove_Context --
5096 --------------------
5098 procedure Remove_Context (N : Node_Id) is
5099 Lib_Unit : constant Node_Id := Unit (N);
5102 -- If this is a child unit, first remove the parent units
5104 if Is_Child_Spec (Lib_Unit) then
5105 Remove_Parents (Lib_Unit);
5108 Remove_Context_Clauses (N);
5111 ----------------------------
5112 -- Remove_Context_Clauses --
5113 ----------------------------
5115 procedure Remove_Context_Clauses (N : Node_Id) is
5117 Unit_Name : Entity_Id;
5120 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5121 -- limited-views first and regular-views later (to maintain the
5124 -- First Phase: Remove limited_with context clauses
5126 Item := First (Context_Items (N));
5127 while Present (Item) loop
5129 -- We are interested only in with clauses which got installed
5132 if Nkind (Item) = N_With_Clause
5133 and then Limited_Present (Item)
5134 and then Limited_View_Installed (Item)
5136 Remove_Limited_With_Clause (Item);
5142 -- Second Phase: Loop through context items and undo regular
5143 -- with_clauses and use_clauses.
5145 Item := First (Context_Items (N));
5146 while Present (Item) loop
5148 -- We are interested only in with clauses which got installed on
5149 -- entry, as indicated by their Context_Installed flag set
5151 if Nkind (Item) = N_With_Clause
5152 and then Limited_Present (Item)
5153 and then Limited_View_Installed (Item)
5157 elsif Nkind (Item) = N_With_Clause
5158 and then Context_Installed (Item)
5160 -- Remove items from one with'ed unit
5162 Unit_Name := Entity (Name (Item));
5163 Remove_Unit_From_Visibility (Unit_Name);
5164 Set_Context_Installed (Item, False);
5166 elsif Nkind (Item) = N_Use_Package_Clause then
5167 End_Use_Package (Item);
5169 elsif Nkind (Item) = N_Use_Type_Clause then
5170 End_Use_Type (Item);
5175 end Remove_Context_Clauses;
5177 --------------------------------
5178 -- Remove_Limited_With_Clause --
5179 --------------------------------
5181 procedure Remove_Limited_With_Clause (N : Node_Id) is
5182 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5185 Lim_Header : Entity_Id;
5186 Lim_Typ : Entity_Id;
5190 pragma Assert (Limited_View_Installed (N));
5192 -- In case of limited with_clause on subprograms, generics, instances,
5193 -- or renamings, the corresponding error was previously posted and we
5194 -- have nothing to do here.
5196 if Nkind (P_Unit) /= N_Package_Declaration then
5200 P := Defining_Unit_Name (Specification (P_Unit));
5202 -- Handle child packages
5204 if Nkind (P) = N_Defining_Program_Unit_Name then
5205 P := Defining_Identifier (P);
5208 if Debug_Flag_I then
5209 Write_Str ("remove limited view of ");
5210 Write_Name (Chars (P));
5211 Write_Str (" from visibility");
5215 -- Prepare the removal of the shadow entities from visibility. The
5216 -- first element of the limited view is a header (an E_Package
5217 -- entity) that is used to reference the first shadow entity in the
5218 -- private part of the package
5220 Lim_Header := Limited_View (P);
5221 Lim_Typ := First_Entity (Lim_Header);
5223 -- Remove package and shadow entities from visibility if it has not
5226 if not Analyzed (P_Unit) then
5228 Set_Is_Immediately_Visible (P, False);
5230 while Present (Lim_Typ) loop
5232 Next_Entity (Lim_Typ);
5235 -- Otherwise this package has already appeared in the closure and its
5236 -- shadow entities must be replaced by its real entities. This code
5237 -- must be kept synchronized with the complementary code in Install
5238 -- Limited_Withed_Unit.
5241 -- Real entities that are type or subtype declarations were hidden
5242 -- from visibility at the point of installation of the limited-view.
5243 -- Now we recover the previous value of the hidden attribute.
5245 E := First_Entity (P);
5246 while Present (E) and then E /= First_Private_Entity (P) loop
5248 Set_Is_Hidden (E, Was_Hidden (E));
5254 while Present (Lim_Typ)
5255 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5257 -- Nested packages and child units were not unchained
5259 if Ekind (Lim_Typ) /= E_Package
5260 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5262 -- Handle incomplete types of the real view. For this purpose
5263 -- we traverse the list of visible entities to look for an
5264 -- incomplete type in the real-view associated with Lim_Typ.
5266 E := First_Entity (P);
5267 while Present (E) and then E /= First_Private_Entity (P) loop
5268 exit when Ekind (E) = E_Incomplete_Type
5269 and then Present (Full_View (E))
5270 and then Full_View (E) = Lim_Typ;
5275 -- If the previous search was not sucessful then the entity
5276 -- to be restored in the homonym list is the non-limited view
5278 if E = First_Private_Entity (P) then
5279 E := Non_Limited_View (Lim_Typ);
5282 pragma Assert (not In_Chain (E));
5284 Prev := Current_Entity (Lim_Typ);
5286 if Prev = Lim_Typ then
5287 Set_Current_Entity (E);
5290 while Present (Prev)
5291 and then Homonym (Prev) /= Lim_Typ
5293 Prev := Homonym (Prev);
5296 if Present (Prev) then
5297 Set_Homonym (Prev, E);
5301 -- We must also set the next homonym entity of the real entity
5302 -- to handle the case in which the next homonym was a shadow
5305 Set_Homonym (E, Homonym (Lim_Typ));
5308 Next_Entity (Lim_Typ);
5312 -- Indicate that the limited view of the package is not installed
5314 Set_From_With_Type (P, False);
5315 Set_Limited_View_Installed (N, False);
5316 end Remove_Limited_With_Clause;
5318 --------------------
5319 -- Remove_Parents --
5320 --------------------
5322 procedure Remove_Parents (Lib_Unit : Node_Id) is
5325 P_Spec : Node_Id := Empty;
5327 Vis : constant Boolean :=
5328 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
5331 if Is_Child_Spec (Lib_Unit) then
5332 P_Spec := Parent_Spec (Lib_Unit);
5334 elsif Nkind (Lib_Unit) = N_Package_Body
5335 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
5337 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
5340 if Present (P_Spec) then
5343 P_Name := Get_Parent_Entity (P);
5344 Remove_Context_Clauses (P_Spec);
5345 End_Package_Scope (P_Name);
5346 Set_Is_Immediately_Visible (P_Name, Vis);
5348 -- Remove from visibility the siblings as well, which are directly
5349 -- visible while the parent is in scope.
5351 E := First_Entity (P_Name);
5352 while Present (E) loop
5353 if Is_Child_Unit (E) then
5354 Set_Is_Immediately_Visible (E, False);
5360 Set_In_Package_Body (P_Name, False);
5362 -- This is the recursive call to remove the context of any
5363 -- higher level parent. This recursion ensures that all parents
5364 -- are removed in the reverse order of their installation.
5370 ---------------------------------
5371 -- Remove_Private_With_Clauses --
5372 ---------------------------------
5374 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
5377 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
5378 -- Check whether a given unit appears in a regular with_clause.
5379 -- Used to determine whether a private_with_clause, implicit or
5380 -- explicit, should be ignored.
5382 ----------------------------
5383 -- In_Regular_With_Clause --
5384 ----------------------------
5386 function In_Regular_With_Clause (E : Entity_Id) return Boolean
5391 Item := First (Context_Items (Comp_Unit));
5392 while Present (Item) loop
5393 if Nkind (Item) = N_With_Clause
5394 and then Entity (Name (Item)) = E
5395 and then not Private_Present (Item)
5403 end In_Regular_With_Clause;
5405 -- Start of processing for Remove_Private_With_Clauses
5408 Item := First (Context_Items (Comp_Unit));
5409 while Present (Item) loop
5410 if Nkind (Item) = N_With_Clause
5411 and then Private_Present (Item)
5414 -- If private_with_clause is redundant, remove it from
5415 -- context, as a small optimization to subsequent handling
5416 -- of private_with clauses in other nested packages..
5418 if In_Regular_With_Clause (Entity (Name (Item))) then
5420 Nxt : constant Node_Id := Next (Item);
5427 elsif Limited_Present (Item) then
5428 if not Limited_View_Installed (Item) then
5429 Remove_Limited_With_Clause (Item);
5435 Remove_Unit_From_Visibility (Entity (Name (Item)));
5436 Set_Context_Installed (Item, False);
5444 end Remove_Private_With_Clauses;
5446 ---------------------------------
5447 -- Remove_Unit_From_Visibility --
5448 ---------------------------------
5450 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
5451 P : constant Entity_Id := Scope (Unit_Name);
5455 if Debug_Flag_I then
5456 Write_Str ("remove unit ");
5457 Write_Name (Chars (Unit_Name));
5458 Write_Str (" from visibility");
5462 if P /= Standard_Standard then
5463 Set_Is_Visible_Child_Unit (Unit_Name, False);
5466 Set_Is_Potentially_Use_Visible (Unit_Name, False);
5467 Set_Is_Immediately_Visible (Unit_Name, False);
5468 end Remove_Unit_From_Visibility;
5483 procedure Unchain (E : Entity_Id) is
5487 Prev := Current_Entity (E);
5493 Set_Name_Entity_Id (Chars (E), Homonym (E));
5496 while Present (Prev)
5497 and then Homonym (Prev) /= E
5499 Prev := Homonym (Prev);
5502 if Present (Prev) then
5503 Set_Homonym (Prev, Homonym (E));
5507 if Debug_Flag_I then
5508 Write_Str (" (homonym) unchain ");
5509 Write_Name (Chars (E));
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