1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Debug; use Debug;
28 with Einfo; use Einfo;
29 with Errout; use Errout;
30 with Exp_Util; use Exp_Util;
31 with Elists; use Elists;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
35 with Impunit; use Impunit;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Namet; use Namet;
41 with Nlists; use Nlists;
42 with Nmake; use Nmake;
44 with Output; use Output;
45 with Par_SCO; use Par_SCO;
46 with Restrict; use Restrict;
47 with Rident; use Rident;
48 with Rtsfind; use Rtsfind;
50 with Sem_Ch3; use Sem_Ch3;
51 with Sem_Ch6; use Sem_Ch6;
52 with Sem_Ch7; use Sem_Ch7;
53 with Sem_Ch8; use Sem_Ch8;
54 with Sem_Dist; use Sem_Dist;
55 with Sem_Prag; use Sem_Prag;
56 with Sem_Util; use Sem_Util;
57 with Sem_Warn; use Sem_Warn;
58 with Stand; use Stand;
59 with Sinfo; use Sinfo;
60 with Sinfo.CN; use Sinfo.CN;
61 with Sinput; use Sinput;
62 with Snames; use Snames;
63 with Style; use Style;
64 with Stylesw; use Stylesw;
65 with Tbuild; use Tbuild;
66 with Uname; use Uname;
68 package body Sem_Ch10 is
70 -----------------------
71 -- Local Subprograms --
72 -----------------------
74 procedure Analyze_Context (N : Node_Id);
75 -- Analyzes items in the context clause of compilation unit
77 procedure Build_Limited_Views (N : Node_Id);
78 -- Build and decorate the list of shadow entities for a package mentioned
79 -- in a limited_with clause. If the package was not previously analyzed
80 -- then it also performs a basic decoration of the real entities. This is
81 -- required to do not pass non-decorated entities to the back-end.
82 -- Implements Ada 2005 (AI-50217).
84 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id);
85 -- Check whether the source for the body of a compilation unit must be
86 -- included in a standalone library.
88 procedure Check_Private_Child_Unit (N : Node_Id);
89 -- If a with_clause mentions a private child unit, the compilation unit
90 -- must be a member of the same family, as described in 10.1.2.
92 procedure Check_Stub_Level (N : Node_Id);
93 -- Verify that a stub is declared immediately within a compilation unit,
94 -- and not in an inner frame.
96 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id);
97 -- When a child unit appears in a context clause, the implicit withs on
98 -- parents are made explicit, and with clauses are inserted in the context
99 -- clause before the one for the child. If a parent in the with_clause
100 -- is a renaming, the implicit with_clause is on the renaming whose name
101 -- is mentioned in the with_clause, and not on the package it renames.
102 -- N is the compilation unit whose list of context items receives the
103 -- implicit with_clauses.
105 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
106 -- Get defining entity of parent unit of a child unit. In most cases this
107 -- is the defining entity of the unit, but for a child instance whose
108 -- parent needs a body for inlining, the instantiation node of the parent
109 -- has not yet been rewritten as a package declaration, and the entity has
110 -- to be retrieved from the Instance_Spec of the unit.
112 function Has_With_Clause
115 Is_Limited : Boolean := False) return Boolean;
116 -- Determine whether compilation unit C_Unit contains a [limited] with
117 -- clause for package Pack. Use the flag Is_Limited to designate desired
120 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id);
121 -- If the main unit is a child unit, implicit withs are also added for
122 -- all its ancestors.
124 function In_Chain (E : Entity_Id) return Boolean;
125 -- Check that the shadow entity is not already in the homonym chain, for
126 -- example through a limited_with clause in a parent unit.
128 procedure Install_Context_Clauses (N : Node_Id);
129 -- Subsidiary to Install_Context and Install_Parents. Process all with
130 -- and use clauses for current unit and its library unit if any.
132 procedure Install_Limited_Context_Clauses (N : Node_Id);
133 -- Subsidiary to Install_Context. Process only limited with_clauses for
134 -- current unit. Implements Ada 2005 (AI-50217).
136 procedure Install_Limited_Withed_Unit (N : Node_Id);
137 -- Place shadow entities for a limited_with package in the visibility
138 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
140 procedure Install_Withed_Unit
141 (With_Clause : Node_Id;
142 Private_With_OK : Boolean := False);
143 -- If the unit is not a child unit, make unit immediately visible. The
144 -- caller ensures that the unit is not already currently installed. The
145 -- flag Private_With_OK is set true in Install_Private_With_Clauses, which
146 -- is called when compiling the private part of a package, or installing
147 -- the private declarations of a parent unit.
149 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean);
150 -- This procedure establishes the context for the compilation of a child
151 -- unit. If Lib_Unit is a child library spec then the context of the parent
152 -- is installed, and the parent itself made immediately visible, so that
153 -- the child unit is processed in the declarative region of the parent.
154 -- Install_Parents makes a recursive call to itself to ensure that all
155 -- parents are loaded in the nested case. If Lib_Unit is a library body,
156 -- the only effect of Install_Parents is to install the private decls of
157 -- the parents, because the visible parent declarations will have been
158 -- installed as part of the context of the corresponding spec.
160 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id);
161 -- In the compilation of a child unit, a child of any of the ancestor
162 -- units is directly visible if it is visible, because the parent is in
163 -- an enclosing scope. Iterate over context to find child units of U_Name
164 -- or of some ancestor of it.
166 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean;
167 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
168 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
169 -- a library spec that has a parent. If the call to Is_Child_Spec returns
170 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
171 -- compilation unit for the parent spec.
173 -- Lib_Unit can also be a subprogram body that acts as its own spec. If the
174 -- Parent_Spec is non-empty, this is also a child unit.
176 procedure Remove_Context_Clauses (N : Node_Id);
177 -- Subsidiary of previous one. Remove use_ and with_clauses
179 procedure Remove_Limited_With_Clause (N : Node_Id);
180 -- Remove from visibility the shadow entities introduced for a package
181 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
183 procedure Remove_Parents (Lib_Unit : Node_Id);
184 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
185 -- contexts established by the corresponding call to Install_Parents are
186 -- removed. Remove_Parents contains a recursive call to itself to ensure
187 -- that all parents are removed in the nested case.
189 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
190 -- Reset all visibility flags on unit after compiling it, either as a main
191 -- unit or as a unit in the context.
193 procedure Unchain (E : Entity_Id);
194 -- Remove single entity from visibility list
196 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
197 -- Common processing for all stubs (subprograms, tasks, packages, and
198 -- protected cases). N is the stub to be analyzed. Once the subunit name
199 -- is established, load and analyze. Nam is the non-overloadable entity
200 -- for which the proper body provides a completion. Subprogram stubs are
201 -- handled differently because they can be declarations.
204 -- A dummy procedure, for debugging use, called just before analyzing the
205 -- main unit (after dealing with any context clauses).
207 --------------------------
208 -- Limited_With_Clauses --
209 --------------------------
211 -- Limited_With clauses are the mechanism chosen for Ada05 to support
212 -- mutually recursive types declared in different units. A limited_with
213 -- clause that names package P in the context of unit U makes the types
214 -- declared in the visible part of P available within U, but with the
215 -- restriction that these types can only be used as incomplete types.
216 -- The limited_with clause does not impose a semantic dependence on P,
217 -- and it is possible for two packages to have limited_with_clauses on
218 -- each other without creating an elaboration circularity.
220 -- To support this feature, the analysis of a limited_with clause must
221 -- create an abbreviated view of the package, without performing any
222 -- semantic analysis on it. This "package abstract" contains shadow types
223 -- that are in one-one correspondence with the real types in the package,
224 -- and that have the properties of incomplete types.
226 -- The implementation creates two element lists: one to chain the shadow
227 -- entities, and one to chain the corresponding type entities in the tree
228 -- of the package. Links between corresponding entities in both chains
229 -- allow the compiler to select the proper view of a given type, depending
230 -- on the context. Note that in contrast with the handling of private
231 -- types, the limited view and the non-limited view of a type are treated
232 -- as separate entities, and no entity exchange needs to take place, which
233 -- makes the implementation must simpler than could be feared.
235 ------------------------------
236 -- Analyze_Compilation_Unit --
237 ------------------------------
239 procedure Analyze_Compilation_Unit (N : Node_Id) is
240 Unit_Node : constant Node_Id := Unit (N);
241 Lib_Unit : Node_Id := Library_Unit (N);
243 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
244 Par_Spec_Name : Unit_Name_Type;
245 Unum : Unit_Number_Type;
247 procedure Check_Redundant_Withs
248 (Context_Items : List_Id;
249 Spec_Context_Items : List_Id := No_List);
250 -- Determine whether the context list of a compilation unit contains
251 -- redundant with clauses. When checking body clauses against spec
252 -- clauses, set Context_Items to the context list of the body and
253 -- Spec_Context_Items to that of the spec. Parent packages are not
254 -- examined for documentation purposes.
256 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
257 -- Generate cross-reference information for the parents of child units.
258 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
260 ---------------------------
261 -- Check_Redundant_Withs --
262 ---------------------------
264 procedure Check_Redundant_Withs
265 (Context_Items : List_Id;
266 Spec_Context_Items : List_Id := No_List)
270 procedure Process_Body_Clauses
271 (Context_List : List_Id;
273 Used : in out Boolean;
274 Used_Type_Or_Elab : in out Boolean);
275 -- Examine the context clauses of a package body, trying to match the
276 -- name entity of Clause with any list element. If the match occurs
277 -- on a use package clause set Used to True, for a use type clause or
278 -- pragma Elaborate[_All], set Used_Type_Or_Elab to True.
280 procedure Process_Spec_Clauses
281 (Context_List : List_Id;
283 Used : in out Boolean;
284 Withed : in out Boolean;
285 Exit_On_Self : Boolean := False);
286 -- Examine the context clauses of a package spec, trying to match
287 -- the name entity of Clause with any list element. If the match
288 -- occurs on a use package clause, set Used to True, for a with
289 -- package clause other than Clause, set Withed to True. Limited
290 -- with clauses, implicitly generated with clauses and withs
291 -- having pragmas Elaborate or Elaborate_All applied to them are
292 -- skipped. Exit_On_Self is used to control the search loop and
293 -- force an exit whenever Clause sees itself in the search.
295 --------------------------
296 -- Process_Body_Clauses --
297 --------------------------
299 procedure Process_Body_Clauses
300 (Context_List : List_Id;
302 Used : in out Boolean;
303 Used_Type_Or_Elab : in out Boolean)
305 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
311 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean;
312 -- In an expanded name in a use clause, if the prefix is a renamed
313 -- package, the entity is set to the original package as a result,
314 -- when checking whether the package appears in a previous with
315 -- clause, the renaming has to be taken into account, to prevent
316 -- spurious/incorrect warnings. A common case is use of Text_IO.
322 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean is
324 return Entity (N) = P
326 (Present (Renamed_Object (P))
327 and then Entity (N) = Renamed_Object (P));
330 -- Start of processing for Process_Body_Clauses
334 Used_Type_Or_Elab := False;
336 Cont_Item := First (Context_List);
337 while Present (Cont_Item) loop
339 -- Package use clause
341 if Nkind (Cont_Item) = N_Use_Package_Clause
344 -- Search through use clauses
346 Use_Item := First (Names (Cont_Item));
347 while Present (Use_Item) and then not Used loop
349 -- Case of a direct use of the one we are looking for
351 if Entity (Use_Item) = Nam_Ent then
354 -- Handle nested case, as in "with P; use P.Q.R"
361 -- Loop through prefixes looking for match
364 while Nkind (UE) = N_Expanded_Name loop
365 if Same_Unit (Prefix (UE), Nam_Ent) then
380 elsif Nkind (Cont_Item) = N_Use_Type_Clause
381 and then not Used_Type_Or_Elab
383 Subt_Mark := First (Subtype_Marks (Cont_Item));
384 while Present (Subt_Mark)
385 and then not Used_Type_Or_Elab
387 if Same_Unit (Prefix (Subt_Mark), Nam_Ent) then
388 Used_Type_Or_Elab := True;
394 -- Pragma Elaborate or Elaborate_All
396 elsif Nkind (Cont_Item) = N_Pragma
398 (Pragma_Name (Cont_Item) = Name_Elaborate
400 Pragma_Name (Cont_Item) = Name_Elaborate_All)
401 and then not Used_Type_Or_Elab
404 First (Pragma_Argument_Associations (Cont_Item));
405 while Present (Prag_Unit)
406 and then not Used_Type_Or_Elab
408 if Entity (Expression (Prag_Unit)) = Nam_Ent then
409 Used_Type_Or_Elab := True;
418 end Process_Body_Clauses;
420 --------------------------
421 -- Process_Spec_Clauses --
422 --------------------------
424 procedure Process_Spec_Clauses
425 (Context_List : List_Id;
427 Used : in out Boolean;
428 Withed : in out Boolean;
429 Exit_On_Self : Boolean := False)
431 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
439 Cont_Item := First (Context_List);
440 while Present (Cont_Item) loop
442 -- Stop the search since the context items after Cont_Item have
443 -- already been examined in a previous iteration of the reverse
444 -- loop in Check_Redundant_Withs.
447 and Cont_Item = Clause
452 -- Package use clause
454 if Nkind (Cont_Item) = N_Use_Package_Clause
457 Use_Item := First (Names (Cont_Item));
458 while Present (Use_Item) and then not Used loop
459 if Entity (Use_Item) = Nam_Ent then
466 -- Package with clause. Avoid processing self, implicitly
467 -- generated with clauses or limited with clauses. Note that
468 -- we examine with clauses having pragmas Elaborate or
469 -- Elaborate_All applied to them due to cases such as:
474 -- pragma Elaborate (Pack);
476 -- In this case, the second with clause is redundant since
477 -- the pragma applies only to the first "with Pack;".
479 elsif Nkind (Cont_Item) = N_With_Clause
480 and then not Implicit_With (Cont_Item)
481 and then not Limited_Present (Cont_Item)
482 and then Cont_Item /= Clause
483 and then Entity (Name (Cont_Item)) = Nam_Ent
490 end Process_Spec_Clauses;
492 -- Start of processing for Check_Redundant_Withs
495 Clause := Last (Context_Items);
496 while Present (Clause) loop
498 -- Avoid checking implicitly generated with clauses, limited with
499 -- clauses or withs that have pragma Elaborate or Elaborate_All.
501 if Nkind (Clause) = N_With_Clause
502 and then not Implicit_With (Clause)
503 and then not Limited_Present (Clause)
504 and then not Elaborate_Present (Clause)
506 -- Package body-to-spec check
508 if Present (Spec_Context_Items) then
510 Used_In_Body : Boolean := False;
511 Used_In_Spec : Boolean := False;
512 Used_Type_Or_Elab : Boolean := False;
513 Withed_In_Spec : Boolean := False;
517 (Context_List => Spec_Context_Items,
519 Used => Used_In_Spec,
520 Withed => Withed_In_Spec);
523 (Context_List => Context_Items,
525 Used => Used_In_Body,
526 Used_Type_Or_Elab => Used_Type_Or_Elab);
528 -- "Type Elab" refers to the presence of either a use
529 -- type clause, pragmas Elaborate or Elaborate_All.
531 -- +---------------+---------------------------+------+
532 -- | Spec | Body | Warn |
533 -- +--------+------+--------+------+-----------+------+
534 -- | Withed | Used | Withed | Used | Type Elab | |
535 -- | X | | X | | | X |
536 -- | X | | X | X | | |
537 -- | X | | X | | X | |
538 -- | X | | X | X | X | |
539 -- | X | X | X | | | X |
540 -- | X | X | X | | X | |
541 -- | X | X | X | X | | X |
542 -- | X | X | X | X | X | |
543 -- +--------+------+--------+------+-----------+------+
546 and then not Used_Type_Or_Elab)
549 and then not Used_In_Body)
553 Error_Msg_N -- CODEFIX
554 ("?redundant with clause in body", Clause);
557 Used_In_Body := False;
558 Used_In_Spec := False;
559 Used_Type_Or_Elab := False;
560 Withed_In_Spec := False;
563 -- Standalone package spec or body check
567 Dont_Care : Boolean := False;
568 Withed : Boolean := False;
571 -- The mechanism for examining the context clauses of a
572 -- package spec can be applied to package body clauses.
575 (Context_List => Context_Items,
579 Exit_On_Self => True);
582 Error_Msg_N -- CODEFIX
583 ("?redundant with clause", Clause);
591 end Check_Redundant_Withs;
593 --------------------------------
594 -- Generate_Parent_References --
595 --------------------------------
597 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is
599 P_Name : Entity_Id := P_Id;
602 Pref := Name (Parent (Defining_Entity (N)));
604 if Nkind (Pref) = N_Expanded_Name then
606 -- Done already, if the unit has been compiled indirectly as
607 -- part of the closure of its context because of inlining.
612 while Nkind (Pref) = N_Selected_Component loop
613 Change_Selected_Component_To_Expanded_Name (Pref);
614 Set_Entity (Pref, P_Name);
615 Set_Etype (Pref, Etype (P_Name));
616 Generate_Reference (P_Name, Pref, 'r');
617 Pref := Prefix (Pref);
618 P_Name := Scope (P_Name);
621 -- The guard here on P_Name is to handle the error condition where
622 -- the parent unit is missing because the file was not found.
624 if Present (P_Name) then
625 Set_Entity (Pref, P_Name);
626 Set_Etype (Pref, Etype (P_Name));
627 Generate_Reference (P_Name, Pref, 'r');
628 Style.Check_Identifier (Pref, P_Name);
630 end Generate_Parent_References;
632 -- Start of processing for Analyze_Compilation_Unit
635 Process_Compilation_Unit_Pragmas (N);
637 -- If the unit is a subunit whose parent has not been analyzed (which
638 -- indicates that the main unit is a subunit, either the current one or
639 -- one of its descendents) then the subunit is compiled as part of the
640 -- analysis of the parent, which we proceed to do. Basically this gets
641 -- handled from the top down and we don't want to do anything at this
642 -- level (i.e. this subunit will be handled on the way down from the
643 -- parent), so at this level we immediately return. If the subunit ends
644 -- up not analyzed, it means that the parent did not contain a stub for
645 -- it, or that there errors were detected in some ancestor.
647 if Nkind (Unit_Node) = N_Subunit
648 and then not Analyzed (Lib_Unit)
650 Semantics (Lib_Unit);
652 if not Analyzed (Proper_Body (Unit_Node)) then
653 if Serious_Errors_Detected > 0 then
654 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N);
656 Error_Msg_N ("missing stub for subunit", N);
663 -- Analyze context (this will call Sem recursively for with'ed units) To
664 -- detect circularities among with-clauses that are not caught during
665 -- loading, we set the Context_Pending flag on the current unit. If the
666 -- flag is already set there is a potential circularity. We exclude
667 -- predefined units from this check because they are known to be safe.
668 -- We also exclude package bodies that are present because circularities
669 -- between bodies are harmless (and necessary).
671 if Context_Pending (N) then
673 Circularity : Boolean := True;
676 if Is_Predefined_File_Name
677 (Unit_File_Name (Get_Source_Unit (Unit (N))))
679 Circularity := False;
682 for U in Main_Unit + 1 .. Last_Unit loop
683 if Nkind (Unit (Cunit (U))) = N_Package_Body
684 and then not Analyzed (Cunit (U))
686 Circularity := False;
693 Error_Msg_N ("circular dependency caused by with_clauses", N);
695 ("\possibly missing limited_with clause"
696 & " in one of the following", N);
698 for U in Main_Unit .. Last_Unit loop
699 if Context_Pending (Cunit (U)) then
700 Error_Msg_Unit_1 := Get_Unit_Name (Unit (Cunit (U)));
701 Error_Msg_N ("\unit$", N);
705 raise Unrecoverable_Error;
709 Set_Context_Pending (N);
714 Set_Context_Pending (N, False);
716 -- If the unit is a package body, the spec is already loaded and must be
717 -- analyzed first, before we analyze the body.
719 if Nkind (Unit_Node) = N_Package_Body then
721 -- If no Lib_Unit, then there was a serious previous error, so just
722 -- ignore the entire analysis effort
724 if No (Lib_Unit) then
728 Semantics (Lib_Unit);
729 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
731 -- Verify that the library unit is a package declaration
733 if not Nkind_In (Unit (Lib_Unit), N_Package_Declaration,
734 N_Generic_Package_Declaration)
737 ("no legal package declaration for package body", N);
740 -- Otherwise, the entity in the declaration is visible. Update the
741 -- version to reflect dependence of this body on the spec.
744 Spec_Id := Defining_Entity (Unit (Lib_Unit));
745 Set_Is_Immediately_Visible (Spec_Id, True);
746 Version_Update (N, Lib_Unit);
748 if Nkind (Defining_Unit_Name (Unit_Node)) =
749 N_Defining_Program_Unit_Name
751 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
756 -- If the unit is a subprogram body, then we similarly need to analyze
757 -- its spec. However, things are a little simpler in this case, because
758 -- here, this analysis is done only for error checking and consistency
759 -- purposes, so there's nothing else to be done.
761 elsif Nkind (Unit_Node) = N_Subprogram_Body then
762 if Acts_As_Spec (N) then
764 -- If the subprogram body is a child unit, we must create a
765 -- declaration for it, in order to properly load the parent(s).
766 -- After this, the original unit does not acts as a spec, because
767 -- there is an explicit one. If this unit appears in a context
768 -- clause, then an implicit with on the parent will be added when
769 -- installing the context. If this is the main unit, there is no
770 -- Unit_Table entry for the declaration (it has the unit number
771 -- of the main unit) and code generation is unaffected.
773 Unum := Get_Cunit_Unit_Number (N);
774 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
776 if Par_Spec_Name /= No_Unit_Name then
779 (Load_Name => Par_Spec_Name,
784 if Unum /= No_Unit then
786 -- Build subprogram declaration and attach parent unit to it
787 -- This subprogram declaration does not come from source,
788 -- Nevertheless the backend must generate debugging info for
789 -- it, and this must be indicated explicitly. We also mark
790 -- the body entity as a child unit now, to prevent a
791 -- cascaded error if the spec entity cannot be entered
792 -- in its scope. Finally we create a Units table entry for
793 -- the subprogram declaration, to maintain a one-to-one
794 -- correspondence with compilation unit nodes. This is
795 -- critical for the tree traversals performed by CodePeer.
798 Loc : constant Source_Ptr := Sloc (N);
799 SCS : constant Boolean :=
800 Get_Comes_From_Source_Default;
803 Set_Comes_From_Source_Default (False);
805 Make_Compilation_Unit (Loc,
806 Context_Items => New_Copy_List (Context_Items (N)),
808 Make_Subprogram_Declaration (Sloc (N),
811 (Specification (Unit_Node))),
813 Make_Compilation_Unit_Aux (Loc));
815 Set_Library_Unit (N, Lib_Unit);
816 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
817 Make_Child_Decl_Unit (N);
818 Semantics (Lib_Unit);
820 -- Now that a separate declaration exists, the body
821 -- of the child unit does not act as spec any longer.
823 Set_Acts_As_Spec (N, False);
824 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
825 Set_Debug_Info_Needed (Defining_Entity (Unit (Lib_Unit)));
826 Set_Comes_From_Source_Default (SCS);
831 -- Here for subprogram with separate declaration
834 Semantics (Lib_Unit);
835 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
836 Version_Update (N, Lib_Unit);
839 -- If this is a child unit, generate references to the parents
841 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
842 N_Defining_Program_Unit_Name
844 Generate_Parent_References (
845 Specification (Unit_Node),
846 Scope (Defining_Entity (Unit (Lib_Unit))));
850 -- If it is a child unit, the parent must be elaborated first and we
851 -- update version, since we are dependent on our parent.
853 if Is_Child_Spec (Unit_Node) then
855 -- The analysis of the parent is done with style checks off
858 Save_Style_Check : constant Boolean := Style_Check;
859 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
860 Cunit_Boolean_Restrictions_Save;
863 if not GNAT_Mode then
864 Style_Check := False;
867 Semantics (Parent_Spec (Unit_Node));
868 Version_Update (N, Parent_Spec (Unit_Node));
869 Style_Check := Save_Style_Check;
870 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
874 -- With the analysis done, install the context. Note that we can't
875 -- install the context from the with clauses as we analyze them, because
876 -- each with clause must be analyzed in a clean visibility context, so
877 -- we have to wait and install them all at once.
881 if Is_Child_Spec (Unit_Node) then
883 -- Set the entities of all parents in the program_unit_name
885 Generate_Parent_References (
886 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
889 -- All components of the context: with-clauses, library unit, ancestors
890 -- if any, (and their context) are analyzed and installed.
892 -- Call special debug routine sm if this is the main unit
894 if Current_Sem_Unit = Main_Unit then
898 -- Now analyze the unit (package, subprogram spec, body) itself
902 if Warn_On_Redundant_Constructs then
903 Check_Redundant_Withs (Context_Items (N));
905 if Nkind (Unit_Node) = N_Package_Body then
906 Check_Redundant_Withs
907 (Context_Items => Context_Items (N),
908 Spec_Context_Items => Context_Items (Lib_Unit));
912 -- The above call might have made Unit_Node an N_Subprogram_Body from
913 -- something else, so propagate any Acts_As_Spec flag.
915 if Nkind (Unit_Node) = N_Subprogram_Body
916 and then Acts_As_Spec (Unit_Node)
918 Set_Acts_As_Spec (N);
921 -- Register predefined units in Rtsfind
924 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
926 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
927 Set_RTU_Loaded (Unit_Node);
931 -- Treat compilation unit pragmas that appear after the library unit
933 if Present (Pragmas_After (Aux_Decls_Node (N))) then
935 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
937 while Present (Prag_Node) loop
944 -- Generate distribution stubs if requested and no error
947 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
949 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
950 and then not Fatal_Error (Main_Unit)
952 if Is_RCI_Pkg_Spec_Or_Body (N) then
954 -- Regular RCI package
956 Add_Stub_Constructs (N);
958 elsif (Nkind (Unit_Node) = N_Package_Declaration
959 and then Is_Shared_Passive (Defining_Entity
960 (Specification (Unit_Node))))
961 or else (Nkind (Unit_Node) = N_Package_Body
963 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
965 -- Shared passive package
967 Add_Stub_Constructs (N);
969 elsif Nkind (Unit_Node) = N_Package_Instantiation
971 Is_Remote_Call_Interface
972 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
974 -- Instantiation of a RCI generic package
976 Add_Stub_Constructs (N);
980 -- Remove unit from visibility, so that environment is clean for the
981 -- next compilation, which is either the main unit or some other unit
984 if Nkind_In (Unit_Node, N_Package_Declaration,
985 N_Package_Renaming_Declaration,
986 N_Subprogram_Declaration)
987 or else Nkind (Unit_Node) in N_Generic_Declaration
989 (Nkind (Unit_Node) = N_Subprogram_Body
990 and then Acts_As_Spec (Unit_Node))
992 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
994 -- If the unit is an instantiation whose body will be elaborated for
995 -- inlining purposes, use the proper entity of the instance. The entity
996 -- may be missing if the instantiation was illegal.
998 elsif Nkind (Unit_Node) = N_Package_Instantiation
999 and then not Error_Posted (Unit_Node)
1000 and then Present (Instance_Spec (Unit_Node))
1002 Remove_Unit_From_Visibility
1003 (Defining_Entity (Instance_Spec (Unit_Node)));
1005 elsif Nkind (Unit_Node) = N_Package_Body
1006 or else (Nkind (Unit_Node) = N_Subprogram_Body
1007 and then not Acts_As_Spec (Unit_Node))
1009 -- Bodies that are not the main unit are compiled if they are generic
1010 -- or contain generic or inlined units. Their analysis brings in the
1011 -- context of the corresponding spec (unit declaration) which must be
1012 -- removed as well, to return the compilation environment to its
1015 Remove_Context (Lib_Unit);
1016 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
1019 -- Last step is to deinstall the context we just installed as well as
1020 -- the unit just compiled.
1024 -- If this is the main unit and we are generating code, we must check
1025 -- that all generic units in the context have a body if they need it,
1026 -- even if they have not been instantiated. In the absence of .ali files
1027 -- for generic units, we must force the load of the body, just to
1028 -- produce the proper error if the body is absent. We skip this
1029 -- verification if the main unit itself is generic.
1031 if Get_Cunit_Unit_Number (N) = Main_Unit
1032 and then Operating_Mode = Generate_Code
1033 and then Expander_Active
1035 -- Check whether the source for the body of the unit must be included
1036 -- in a standalone library.
1038 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
1040 -- Indicate that the main unit is now analyzed, to catch possible
1041 -- circularities between it and generic bodies. Remove main unit from
1042 -- visibility. This might seem superfluous, but the main unit must
1043 -- not be visible in the generic body expansions that follow.
1045 Set_Analyzed (N, True);
1046 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
1051 Un : Unit_Number_Type;
1053 Save_Style_Check : constant Boolean := Style_Check;
1054 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
1055 Cunit_Boolean_Restrictions_Save;
1058 Item := First (Context_Items (N));
1059 while Present (Item) loop
1061 -- Check for explicit with clause
1063 if Nkind (Item) = N_With_Clause
1064 and then not Implicit_With (Item)
1066 -- Ada 2005 (AI-50217): Ignore limited-withed units
1068 and then not Limited_Present (Item)
1070 Nam := Entity (Name (Item));
1072 -- Compile generic subprogram, unless it is intrinsic or
1073 -- imported so no body is required, or generic package body
1074 -- if the package spec requires a body.
1076 if (Is_Generic_Subprogram (Nam)
1077 and then not Is_Intrinsic_Subprogram (Nam)
1078 and then not Is_Imported (Nam))
1079 or else (Ekind (Nam) = E_Generic_Package
1080 and then Unit_Requires_Body (Nam))
1082 Style_Check := False;
1084 if Present (Renamed_Object (Nam)) then
1087 (Load_Name => Get_Body_Name
1089 (Unit_Declaration_Node
1090 (Renamed_Object (Nam)))),
1098 (Load_Name => Get_Body_Name
1099 (Get_Unit_Name (Item)),
1106 if Un = No_Unit then
1108 ("body of generic unit& not found", Item, Nam);
1111 elsif not Analyzed (Cunit (Un))
1112 and then Un /= Main_Unit
1113 and then not Fatal_Error (Un)
1115 Style_Check := False;
1116 Semantics (Cunit (Un));
1124 Style_Check := Save_Style_Check;
1125 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1129 -- Deal with creating elaboration Boolean if needed. We create an
1130 -- elaboration boolean only for units that come from source since
1131 -- units manufactured by the compiler never need elab checks.
1133 if Comes_From_Source (N)
1134 and then Nkind_In (Unit_Node, N_Package_Declaration,
1135 N_Generic_Package_Declaration,
1136 N_Subprogram_Declaration,
1137 N_Generic_Subprogram_Declaration)
1140 Loc : constant Source_Ptr := Sloc (N);
1141 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1144 Spec_Id := Defining_Entity (Unit_Node);
1145 Generate_Definition (Spec_Id);
1147 -- See if an elaboration entity is required for possible access
1148 -- before elaboration checking. Note that we must allow for this
1149 -- even if -gnatE is not set, since a client may be compiled in
1150 -- -gnatE mode and reference the entity.
1152 -- These entities are also used by the binder to prevent multiple
1153 -- attempts to execute the elaboration code for the library case
1154 -- where the elaboration routine might otherwise be called more
1157 -- Case of units which do not require elaboration checks
1160 -- Pure units do not need checks
1164 -- Preelaborated units do not need checks
1166 or else Is_Preelaborated (Spec_Id)
1168 -- No checks needed if pragma Elaborate_Body present
1170 or else Has_Pragma_Elaborate_Body (Spec_Id)
1172 -- No checks needed if unit does not require a body
1174 or else not Unit_Requires_Body (Spec_Id)
1176 -- No checks needed for predefined files
1178 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1180 -- No checks required if no separate spec
1182 or else Acts_As_Spec (N)
1184 -- This is a case where we only need the entity for
1185 -- checking to prevent multiple elaboration checks.
1187 Set_Elaboration_Entity_Required (Spec_Id, False);
1189 -- Case of elaboration entity is required for access before
1190 -- elaboration checking (so certainly we must build it!)
1193 Set_Elaboration_Entity_Required (Spec_Id, True);
1196 Build_Elaboration_Entity (N, Spec_Id);
1200 -- Freeze the compilation unit entity. This for sure is needed because
1201 -- of some warnings that can be output (see Freeze_Subprogram), but may
1202 -- in general be required. If freezing actions result, place them in the
1203 -- compilation unit actions list, and analyze them.
1206 L : constant List_Id :=
1207 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), N);
1209 while Is_Non_Empty_List (L) loop
1210 Insert_Library_Level_Action (Remove_Head (L));
1216 if Nkind (Unit_Node) = N_Package_Declaration
1217 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1218 and then Expander_Active
1221 Save_Style_Check : constant Boolean := Style_Check;
1222 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1223 Options : Style_Check_Options;
1226 Save_Style_Check_Options (Options);
1227 Reset_Style_Check_Options;
1228 Opt.Warning_Mode := Suppress;
1229 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1231 Reset_Style_Check_Options;
1232 Set_Style_Check_Options (Options);
1233 Style_Check := Save_Style_Check;
1234 Warning_Mode := Save_Warning;
1238 -- If we are generating obsolescent warnings, then here is where we
1239 -- generate them for the with'ed items. The reason for this special
1240 -- processing is that the normal mechanism of generating the warnings
1241 -- for referenced entities does not work for context clause references.
1242 -- That's because when we first analyze the context, it is too early to
1243 -- know if the with'ing unit is itself obsolescent (which suppresses
1246 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1248 -- Push current compilation unit as scope, so that the test for
1249 -- being within an obsolescent unit will work correctly.
1251 Push_Scope (Defining_Entity (Unit_Node));
1253 -- Loop through context items to deal with with clauses
1261 Item := First (Context_Items (N));
1262 while Present (Item) loop
1263 if Nkind (Item) = N_With_Clause
1265 -- Suppress this check in limited-withed units. Further work
1266 -- needed here if we decide to incorporate this check on
1267 -- limited-withed units.
1269 and then not Limited_Present (Item)
1272 Ent := Entity (Nam);
1274 if Is_Obsolescent (Ent) then
1275 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1283 -- Remove temporary install of current unit as scope
1287 end Analyze_Compilation_Unit;
1289 ---------------------
1290 -- Analyze_Context --
1291 ---------------------
1293 procedure Analyze_Context (N : Node_Id) is
1294 Ukind : constant Node_Kind := Nkind (Unit (N));
1298 -- First process all configuration pragmas at the start of the context
1299 -- items. Strictly these are not part of the context clause, but that
1300 -- is where the parser puts them. In any case for sure we must analyze
1301 -- these before analyzing the actual context items, since they can have
1302 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1303 -- be with'ed as a result of changing categorizations in Ada 2005).
1305 Item := First (Context_Items (N));
1306 while Present (Item)
1307 and then Nkind (Item) = N_Pragma
1308 and then Pragma_Name (Item) in Configuration_Pragma_Names
1314 -- This is the point at which we capture the configuration settings
1315 -- for the unit. At the moment only the Optimize_Alignment setting
1316 -- needs to be captured. Probably more later ???
1318 if Optimize_Alignment_Local then
1319 Set_OA_Setting (Current_Sem_Unit, 'L');
1321 Set_OA_Setting (Current_Sem_Unit, Optimize_Alignment);
1324 -- Loop through actual context items. This is done in two passes:
1326 -- a) The first pass analyzes non-limited with-clauses and also any
1327 -- configuration pragmas (we need to get the latter analyzed right
1328 -- away, since they can affect processing of subsequent items.
1330 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1332 while Present (Item) loop
1334 -- For with clause, analyze the with clause, and then update the
1335 -- version, since we are dependent on a unit that we with.
1337 if Nkind (Item) = N_With_Clause
1338 and then not Limited_Present (Item)
1340 -- Skip analyzing with clause if no unit, nothing to do (this
1341 -- happens for a with that references a non-existent unit). Skip
1342 -- as well if this is a with_clause for the main unit, which
1343 -- happens if a subunit has a useless with_clause on its parent.
1345 if Present (Library_Unit (Item)) then
1346 if Library_Unit (Item) /= Cunit (Current_Sem_Unit) then
1350 Set_Entity (Name (Item), Cunit_Entity (Current_Sem_Unit));
1354 if not Implicit_With (Item) then
1355 Version_Update (N, Library_Unit (Item));
1358 -- Skip pragmas. Configuration pragmas at the start were handled in
1359 -- the loop above, and remaining pragmas are not processed until we
1360 -- actually install the context (see Install_Context). We delay the
1361 -- analysis of these pragmas to make sure that we have installed all
1362 -- the implicit with's on parent units.
1364 -- Skip use clauses at this stage, since we don't want to do any
1365 -- installing of potentially use-visible entities until we
1366 -- actually install the complete context (in Install_Context).
1367 -- Otherwise things can get installed in the wrong context.
1376 -- Second pass: examine all limited_with clauses. All other context
1377 -- items are ignored in this pass.
1379 Item := First (Context_Items (N));
1380 while Present (Item) loop
1381 if Nkind (Item) = N_With_Clause
1382 and then Limited_Present (Item)
1384 -- No need to check errors on implicitly generated limited-with
1387 if not Implicit_With (Item) then
1389 -- Verify that the illegal contexts given in 10.1.2 (18/2) are
1390 -- properly rejected, including renaming declarations.
1392 if not Nkind_In (Ukind, N_Package_Declaration,
1393 N_Subprogram_Declaration)
1394 and then Ukind not in N_Generic_Declaration
1395 and then Ukind not in N_Generic_Instantiation
1397 Error_Msg_N ("limited with_clause not allowed here", Item);
1399 -- Check wrong use of a limited with clause applied to the
1400 -- compilation unit containing the limited-with clause.
1402 -- limited with P.Q;
1403 -- package P.Q is ...
1405 elsif Unit (Library_Unit (Item)) = Unit (N) then
1406 Error_Msg_N ("wrong use of limited-with clause", Item);
1408 -- Check wrong use of limited-with clause applied to some
1409 -- immediate ancestor.
1411 elsif Is_Child_Spec (Unit (N)) then
1413 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1417 P := Parent_Spec (Unit (N));
1419 if Unit (P) = Lib_U then
1420 Error_Msg_N ("limited with_clause cannot "
1421 & "name ancestor", Item);
1425 exit when not Is_Child_Spec (Unit (P));
1426 P := Parent_Spec (Unit (P));
1431 -- Check if the limited-withed unit is already visible through
1432 -- some context clause of the current compilation unit or some
1433 -- ancestor of the current compilation unit.
1436 Lim_Unit_Name : constant Node_Id := Name (Item);
1437 Comp_Unit : Node_Id;
1439 Unit_Name : Node_Id;
1444 It := First (Context_Items (Comp_Unit));
1445 while Present (It) loop
1447 and then Nkind (It) = N_With_Clause
1448 and then not Limited_Present (It)
1450 Nkind_In (Unit (Library_Unit (It)),
1451 N_Package_Declaration,
1452 N_Package_Renaming_Declaration)
1454 if Nkind (Unit (Library_Unit (It))) =
1455 N_Package_Declaration
1457 Unit_Name := Name (It);
1459 Unit_Name := Name (Unit (Library_Unit (It)));
1462 -- Check if the named package (or some ancestor)
1463 -- leaves visible the full-view of the unit given
1464 -- in the limited-with clause
1467 if Designate_Same_Unit (Lim_Unit_Name,
1470 Error_Msg_Sloc := Sloc (It);
1472 ("simultaneous visibility of limited "
1473 & "and unlimited views not allowed",
1476 ("\unlimited view visible through "
1477 & "context clause #",
1481 elsif Nkind (Unit_Name) = N_Identifier then
1485 Unit_Name := Prefix (Unit_Name);
1492 exit when not Is_Child_Spec (Unit (Comp_Unit));
1494 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1499 -- Skip analyzing with clause if no unit, see above
1501 if Present (Library_Unit (Item)) then
1505 -- A limited_with does not impose an elaboration order, but
1506 -- there is a semantic dependency for recompilation purposes.
1508 if not Implicit_With (Item) then
1509 Version_Update (N, Library_Unit (Item));
1512 -- Pragmas and use clauses and with clauses other than limited
1513 -- with's are ignored in this pass through the context items.
1521 end Analyze_Context;
1523 -------------------------------
1524 -- Analyze_Package_Body_Stub --
1525 -------------------------------
1527 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1528 Id : constant Entity_Id := Defining_Identifier (N);
1532 -- The package declaration must be in the current declarative part
1534 Check_Stub_Level (N);
1535 Nam := Current_Entity_In_Scope (Id);
1537 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1538 Error_Msg_N ("missing specification for package stub", N);
1540 elsif Has_Completion (Nam)
1541 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1543 Error_Msg_N ("duplicate or redundant stub for package", N);
1546 -- Indicate that the body of the package exists. If we are doing
1547 -- only semantic analysis, the stub stands for the body. If we are
1548 -- generating code, the existence of the body will be confirmed
1549 -- when we load the proper body.
1551 Set_Has_Completion (Nam);
1552 Set_Scope (Defining_Entity (N), Current_Scope);
1553 Generate_Reference (Nam, Id, 'b');
1554 Analyze_Proper_Body (N, Nam);
1556 end Analyze_Package_Body_Stub;
1558 -------------------------
1559 -- Analyze_Proper_Body --
1560 -------------------------
1562 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1563 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1564 Unum : Unit_Number_Type;
1566 procedure Optional_Subunit;
1567 -- This procedure is called when the main unit is a stub, or when we
1568 -- are not generating code. In such a case, we analyze the subunit if
1569 -- present, which is user-friendly and in fact required for ASIS, but
1570 -- we don't complain if the subunit is missing.
1572 ----------------------
1573 -- Optional_Subunit --
1574 ----------------------
1576 procedure Optional_Subunit is
1577 Comp_Unit : Node_Id;
1580 -- Try to load subunit, but ignore any errors that occur during the
1581 -- loading of the subunit, by using the special feature in Errout to
1582 -- ignore all errors. Note that Fatal_Error will still be set, so we
1583 -- will be able to check for this case below.
1585 if not ASIS_Mode then
1586 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1591 (Load_Name => Subunit_Name,
1596 if not ASIS_Mode then
1597 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1600 -- All done if we successfully loaded the subunit
1603 and then (not Fatal_Error (Unum) or else Try_Semantics)
1605 Comp_Unit := Cunit (Unum);
1607 -- If the file was empty or seriously mangled, the unit itself may
1610 if No (Unit (Comp_Unit)) then
1612 ("subunit does not contain expected proper body", N);
1614 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1616 ("expected SEPARATE subunit, found child unit",
1617 Cunit_Entity (Unum));
1619 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1620 Analyze_Subunit (Comp_Unit);
1621 Set_Library_Unit (N, Comp_Unit);
1624 elsif Unum = No_Unit
1625 and then Present (Nam)
1627 if Is_Protected_Type (Nam) then
1628 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1630 Set_Corresponding_Body (
1631 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1634 end Optional_Subunit;
1636 -- Start of processing for Analyze_Proper_Body
1639 -- If the subunit is already loaded, it means that the main unit is a
1640 -- subunit, and that the current unit is one of its parents which was
1641 -- being analyzed to provide the needed context for the analysis of the
1642 -- subunit. In this case we analyze the subunit and continue with the
1643 -- parent, without looking a subsequent subunits.
1645 if Is_Loaded (Subunit_Name) then
1647 -- If the proper body is already linked to the stub node, the stub is
1648 -- in a generic unit and just needs analyzing.
1650 if Present (Library_Unit (N)) then
1651 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1652 Analyze_Subunit (Library_Unit (N));
1654 -- Otherwise we must load the subunit and link to it
1657 -- Load the subunit, this must work, since we originally loaded
1658 -- the subunit earlier on. So this will not really load it, just
1659 -- give access to it.
1663 (Load_Name => Subunit_Name,
1668 -- And analyze the subunit in the parent context (note that we
1669 -- do not call Semantics, since that would remove the parent
1670 -- context). Because of this, we have to manually reset the
1671 -- compiler state to Analyzing since it got destroyed by Load.
1673 if Unum /= No_Unit then
1674 Compiler_State := Analyzing;
1676 -- Check that the proper body is a subunit and not a child
1677 -- unit. If the unit was previously loaded, the error will
1678 -- have been emitted when copying the generic node, so we
1679 -- just return to avoid cascaded errors.
1681 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1685 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1686 Analyze_Subunit (Cunit (Unum));
1687 Set_Library_Unit (N, Cunit (Unum));
1691 -- If the main unit is a subunit, then we are just performing semantic
1692 -- analysis on that subunit, and any other subunits of any parent unit
1693 -- should be ignored, except that if we are building trees for ASIS
1694 -- usage we want to annotate the stub properly.
1696 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1697 and then Subunit_Name /= Unit_Name (Main_Unit)
1703 -- But before we return, set the flag for unloaded subunits. This
1704 -- will suppress junk warnings of variables in the same declarative
1705 -- part (or a higher level one) that are in danger of looking unused
1706 -- when in fact there might be a declaration in the subunit that we
1707 -- do not intend to load.
1709 Unloaded_Subunits := True;
1712 -- If the subunit is not already loaded, and we are generating code,
1713 -- then this is the case where compilation started from the parent, and
1714 -- we are generating code for an entire subunit tree. In that case we
1715 -- definitely need to load the subunit.
1717 -- In order to continue the analysis with the rest of the parent,
1718 -- and other subunits, we load the unit without requiring its
1719 -- presence, and emit a warning if not found, rather than terminating
1720 -- the compilation abruptly, as for other missing file problems.
1722 elsif Original_Operating_Mode = Generate_Code then
1724 -- If the proper body is already linked to the stub node, the stub is
1725 -- in a generic unit and just needs analyzing.
1727 -- We update the version. Although we are not strictly technically
1728 -- semantically dependent on the subunit, given our approach of macro
1729 -- substitution of subunits, it makes sense to include it in the
1730 -- version identification.
1732 if Present (Library_Unit (N)) then
1733 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1734 Analyze_Subunit (Library_Unit (N));
1735 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1737 -- Otherwise we must load the subunit and link to it
1740 -- Make sure that, if the subunit is preprocessed and -gnateG is
1741 -- specified, the preprocessed file will be written.
1743 Lib.Analysing_Subunit_Of_Main := True;
1746 (Load_Name => Subunit_Name,
1750 Lib.Analysing_Subunit_Of_Main := False;
1752 -- Give message if we did not get the unit Emit warning even if
1753 -- missing subunit is not within main unit, to simplify debugging.
1755 if Original_Operating_Mode = Generate_Code
1756 and then Unum = No_Unit
1758 Error_Msg_Unit_1 := Subunit_Name;
1760 Get_File_Name (Subunit_Name, Subunit => True);
1762 ("subunit$$ in file{ not found?!!", N);
1763 Subunits_Missing := True;
1766 -- Load_Unit may reset Compiler_State, since it may have been
1767 -- necessary to parse an additional units, so we make sure that
1768 -- we reset it to the Analyzing state.
1770 Compiler_State := Analyzing;
1772 if Unum /= No_Unit then
1773 if Debug_Flag_L then
1774 Write_Str ("*** Loaded subunit from stub. Analyze");
1779 Comp_Unit : constant Node_Id := Cunit (Unum);
1782 -- Check for child unit instead of subunit
1784 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1786 ("expected SEPARATE subunit, found child unit",
1787 Cunit_Entity (Unum));
1789 -- OK, we have a subunit
1792 -- Set corresponding stub (even if errors)
1794 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1796 -- Collect SCO information for loaded subunit if we are
1797 -- in the main unit).
1801 In_Extended_Main_Source_Unit
1802 (Cunit_Entity (Current_Sem_Unit))
1807 -- Analyze the unit if semantics active
1809 if not Fatal_Error (Unum) or else Try_Semantics then
1810 Analyze_Subunit (Comp_Unit);
1813 -- Set the library unit pointer in any case
1815 Set_Library_Unit (N, Comp_Unit);
1817 -- We update the version. Although we are not technically
1818 -- semantically dependent on the subunit, given our
1819 -- approach of macro substitution of subunits, it makes
1820 -- sense to include it in the version identification.
1822 Version_Update (Cunit (Main_Unit), Comp_Unit);
1828 -- The remaining case is when the subunit is not already loaded and we
1829 -- are not generating code. In this case we are just performing semantic
1830 -- analysis on the parent, and we are not interested in the subunit. For
1831 -- subprograms, analyze the stub as a body. For other entities the stub
1832 -- has already been marked as completed.
1837 end Analyze_Proper_Body;
1839 ----------------------------------
1840 -- Analyze_Protected_Body_Stub --
1841 ----------------------------------
1843 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1844 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1847 Check_Stub_Level (N);
1849 -- First occurrence of name may have been as an incomplete type
1851 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1852 Nam := Full_View (Nam);
1856 or else not Is_Protected_Type (Etype (Nam))
1858 Error_Msg_N ("missing specification for Protected body", N);
1860 Set_Scope (Defining_Entity (N), Current_Scope);
1861 Set_Has_Completion (Etype (Nam));
1862 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1863 Analyze_Proper_Body (N, Etype (Nam));
1865 end Analyze_Protected_Body_Stub;
1867 ----------------------------------
1868 -- Analyze_Subprogram_Body_Stub --
1869 ----------------------------------
1871 -- A subprogram body stub can appear with or without a previous spec. If
1872 -- there is one, then the analysis of the body will find it and verify
1873 -- conformance. The formals appearing in the specification of the stub play
1874 -- no role, except for requiring an additional conformance check. If there
1875 -- is no previous subprogram declaration, the stub acts as a spec, and
1876 -- provides the defining entity for the subprogram.
1878 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1882 Check_Stub_Level (N);
1884 -- Verify that the identifier for the stub is unique within this
1885 -- declarative part.
1887 if Nkind_In (Parent (N), N_Block_Statement,
1891 Decl := First (Declarations (Parent (N)));
1892 while Present (Decl)
1895 if Nkind (Decl) = N_Subprogram_Body_Stub
1896 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1897 Chars (Defining_Unit_Name (Specification (N))))
1899 Error_Msg_N ("identifier for stub is not unique", N);
1906 -- Treat stub as a body, which checks conformance if there is a previous
1907 -- declaration, or else introduces entity and its signature.
1909 Analyze_Subprogram_Body (N);
1910 Analyze_Proper_Body (N, Empty);
1911 end Analyze_Subprogram_Body_Stub;
1913 ---------------------
1914 -- Analyze_Subunit --
1915 ---------------------
1917 -- A subunit is compiled either by itself (for semantic checking) or as
1918 -- part of compiling the parent (for code generation). In either case, by
1919 -- the time we actually process the subunit, the parent has already been
1920 -- installed and analyzed. The node N is a compilation unit, whose context
1921 -- needs to be treated here, because we come directly here from the parent
1922 -- without calling Analyze_Compilation_Unit.
1924 -- The compilation context includes the explicit context of the subunit,
1925 -- and the context of the parent, together with the parent itself. In order
1926 -- to compile the current context, we remove the one inherited from the
1927 -- parent, in order to have a clean visibility table. We restore the parent
1928 -- context before analyzing the proper body itself. On exit, we remove only
1929 -- the explicit context of the subunit.
1931 procedure Analyze_Subunit (N : Node_Id) is
1932 Lib_Unit : constant Node_Id := Library_Unit (N);
1933 Par_Unit : constant Entity_Id := Current_Scope;
1935 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1936 Num_Scopes : Int := 0;
1937 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1938 Enclosing_Child : Entity_Id := Empty;
1939 Svg : constant Suppress_Array := Scope_Suppress;
1941 procedure Analyze_Subunit_Context;
1942 -- Capture names in use clauses of the subunit. This must be done before
1943 -- re-installing parent declarations, because items in the context must
1944 -- not be hidden by declarations local to the parent.
1946 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1947 -- Recursive procedure to restore scope of all ancestors of subunit,
1948 -- from outermost in. If parent is not a subunit, the call to install
1949 -- context installs context of spec and (if parent is a child unit) the
1950 -- context of its parents as well. It is confusing that parents should
1951 -- be treated differently in both cases, but the semantics are just not
1954 procedure Re_Install_Use_Clauses;
1955 -- As part of the removal of the parent scope, the use clauses are
1956 -- removed, to be reinstalled when the context of the subunit has been
1957 -- analyzed. Use clauses may also have been affected by the analysis of
1958 -- the context of the subunit, so they have to be applied again, to
1959 -- insure that the compilation environment of the rest of the parent
1960 -- unit is identical.
1962 procedure Remove_Scope;
1963 -- Remove current scope from scope stack, and preserve the list of use
1964 -- clauses in it, to be reinstalled after context is analyzed.
1966 -----------------------------
1967 -- Analyze_Subunit_Context --
1968 -----------------------------
1970 procedure Analyze_Subunit_Context is
1973 Unit_Name : Entity_Id;
1976 Analyze_Context (N);
1978 -- Make withed units immediately visible. If child unit, make the
1979 -- ultimate parent immediately visible.
1981 Item := First (Context_Items (N));
1982 while Present (Item) loop
1983 if Nkind (Item) = N_With_Clause then
1985 -- Protect frontend against previous errors in context clauses
1987 if Nkind (Name (Item)) /= N_Selected_Component then
1988 if Error_Posted (Item) then
1992 Unit_Name := Entity (Name (Item));
1993 while Is_Child_Unit (Unit_Name) loop
1994 Set_Is_Visible_Child_Unit (Unit_Name);
1995 Unit_Name := Scope (Unit_Name);
1998 if not Is_Immediately_Visible (Unit_Name) then
1999 Set_Is_Immediately_Visible (Unit_Name);
2000 Set_Context_Installed (Item);
2005 elsif Nkind (Item) = N_Use_Package_Clause then
2006 Nam := First (Names (Item));
2007 while Present (Nam) loop
2012 elsif Nkind (Item) = N_Use_Type_Clause then
2013 Nam := First (Subtype_Marks (Item));
2014 while Present (Nam) loop
2023 -- Reset visibility of withed units. They will be made visible again
2024 -- when we install the subunit context.
2026 Item := First (Context_Items (N));
2027 while Present (Item) loop
2028 if Nkind (Item) = N_With_Clause
2030 -- Protect frontend against previous errors in context clauses
2032 and then Nkind (Name (Item)) /= N_Selected_Component
2033 and then not Error_Posted (Item)
2035 Unit_Name := Entity (Name (Item));
2036 while Is_Child_Unit (Unit_Name) loop
2037 Set_Is_Visible_Child_Unit (Unit_Name, False);
2038 Unit_Name := Scope (Unit_Name);
2041 if Context_Installed (Item) then
2042 Set_Is_Immediately_Visible (Unit_Name, False);
2043 Set_Context_Installed (Item, False);
2049 end Analyze_Subunit_Context;
2051 ------------------------
2052 -- Re_Install_Parents --
2053 ------------------------
2055 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
2059 if Nkind (Unit (L)) = N_Subunit then
2060 Re_Install_Parents (Library_Unit (L), Scope (Scop));
2063 Install_Context (L);
2065 -- If the subunit occurs within a child unit, we must restore the
2066 -- immediate visibility of any siblings that may occur in context.
2068 if Present (Enclosing_Child) then
2069 Install_Siblings (Enclosing_Child, L);
2074 if Scop /= Par_Unit then
2075 Set_Is_Immediately_Visible (Scop);
2078 -- Make entities in scope visible again. For child units, restore
2079 -- visibility only if they are actually in context.
2081 E := First_Entity (Current_Scope);
2082 while Present (E) loop
2083 if not Is_Child_Unit (E)
2084 or else Is_Visible_Child_Unit (E)
2086 Set_Is_Immediately_Visible (E);
2092 -- A subunit appears within a body, and for a nested subunits all the
2093 -- parents are bodies. Restore full visibility of their private
2096 if Is_Package_Or_Generic_Package (Scop) then
2097 Set_In_Package_Body (Scop);
2098 Install_Private_Declarations (Scop);
2100 end Re_Install_Parents;
2102 ----------------------------
2103 -- Re_Install_Use_Clauses --
2104 ----------------------------
2106 procedure Re_Install_Use_Clauses is
2109 for J in reverse 1 .. Num_Scopes loop
2110 U := Use_Clauses (J);
2111 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2112 Install_Use_Clauses (U, Force_Installation => True);
2114 end Re_Install_Use_Clauses;
2120 procedure Remove_Scope is
2124 Num_Scopes := Num_Scopes + 1;
2125 Use_Clauses (Num_Scopes) :=
2126 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2128 E := First_Entity (Current_Scope);
2129 while Present (E) loop
2130 Set_Is_Immediately_Visible (E, False);
2134 if Is_Child_Unit (Current_Scope) then
2135 Enclosing_Child := Current_Scope;
2141 -- Start of processing for Analyze_Subunit
2146 Nam : Node_Id := Name (Unit (N));
2149 if Nkind (Nam) = N_Selected_Component then
2150 Nam := Selector_Name (Nam);
2153 Check_Identifier (Nam, Par_Unit);
2157 if not Is_Empty_List (Context_Items (N)) then
2159 -- Save current use clauses
2162 Remove_Context (Lib_Unit);
2164 -- Now remove parents and their context, including enclosing subunits
2165 -- and the outer parent body which is not a subunit.
2167 if Present (Lib_Spec) then
2168 Remove_Context (Lib_Spec);
2170 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2171 Lib_Spec := Library_Unit (Lib_Spec);
2173 Remove_Context (Lib_Spec);
2176 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2180 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2181 Remove_Context (Library_Unit (Lib_Spec));
2185 Set_Is_Immediately_Visible (Par_Unit, False);
2187 Analyze_Subunit_Context;
2189 Re_Install_Parents (Lib_Unit, Par_Unit);
2190 Set_Is_Immediately_Visible (Par_Unit);
2192 -- If the context includes a child unit of the parent of the subunit,
2193 -- the parent will have been removed from visibility, after compiling
2194 -- that cousin in the context. The visibility of the parent must be
2195 -- restored now. This also applies if the context includes another
2196 -- subunit of the same parent which in turn includes a child unit in
2199 if Is_Package_Or_Generic_Package (Par_Unit) then
2200 if not Is_Immediately_Visible (Par_Unit)
2201 or else (Present (First_Entity (Par_Unit))
2202 and then not Is_Immediately_Visible
2203 (First_Entity (Par_Unit)))
2205 Set_Is_Immediately_Visible (Par_Unit);
2206 Install_Visible_Declarations (Par_Unit);
2207 Install_Private_Declarations (Par_Unit);
2211 Re_Install_Use_Clauses;
2212 Install_Context (N);
2214 -- Restore state of suppress flags for current body
2216 Scope_Suppress := Svg;
2218 -- If the subunit is within a child unit, then siblings of any parent
2219 -- unit that appear in the context clause of the subunit must also be
2220 -- made immediately visible.
2222 if Present (Enclosing_Child) then
2223 Install_Siblings (Enclosing_Child, N);
2227 Analyze (Proper_Body (Unit (N)));
2230 -- The subunit may contain a with_clause on a sibling of some ancestor.
2231 -- Removing the context will remove from visibility those ancestor child
2232 -- units, which must be restored to the visibility they have in the
2235 if Present (Enclosing_Child) then
2241 and then Is_Child_Unit (C)
2243 Set_Is_Immediately_Visible (C);
2244 Set_Is_Visible_Child_Unit (C);
2249 end Analyze_Subunit;
2251 ----------------------------
2252 -- Analyze_Task_Body_Stub --
2253 ----------------------------
2255 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2256 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2257 Loc : constant Source_Ptr := Sloc (N);
2260 Check_Stub_Level (N);
2262 -- First occurrence of name may have been as an incomplete type
2264 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2265 Nam := Full_View (Nam);
2268 if No (Nam) or else not Is_Task_Type (Etype (Nam)) then
2269 Error_Msg_N ("missing specification for task body", N);
2271 Set_Scope (Defining_Entity (N), Current_Scope);
2272 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2274 -- Check for duplicate stub, if so give message and terminate
2276 if Has_Completion (Etype (Nam)) then
2277 Error_Msg_N ("duplicate stub for task", N);
2280 Set_Has_Completion (Etype (Nam));
2283 Analyze_Proper_Body (N, Etype (Nam));
2285 -- Set elaboration flag to indicate that entity is callable. This
2286 -- cannot be done in the expansion of the body itself, because the
2287 -- proper body is not in a declarative part. This is only done if
2288 -- expansion is active, because the context may be generic and the
2289 -- flag not defined yet.
2291 if Expander_Active then
2293 Make_Assignment_Statement (Loc,
2295 Make_Identifier (Loc,
2296 Chars => New_External_Name (Chars (Etype (Nam)), 'E')),
2297 Expression => New_Reference_To (Standard_True, Loc)));
2300 end Analyze_Task_Body_Stub;
2302 -------------------------
2303 -- Analyze_With_Clause --
2304 -------------------------
2306 -- Analyze the declaration of a unit in a with clause. At end, label the
2307 -- with clause with the defining entity for the unit.
2309 procedure Analyze_With_Clause (N : Node_Id) is
2311 -- Retrieve the original kind of the unit node, before analysis. If it
2312 -- is a subprogram instantiation, its analysis below will rewrite the
2313 -- node as the declaration of the wrapper package. If the same
2314 -- instantiation appears indirectly elsewhere in the context, it will
2315 -- have been analyzed already.
2317 Unit_Kind : constant Node_Kind :=
2318 Nkind (Original_Node (Unit (Library_Unit (N))));
2319 Nam : constant Node_Id := Name (N);
2321 Par_Name : Entity_Id;
2326 -- Set True if the unit currently being compiled is an internal unit
2328 Save_Style_Check : constant Boolean := Opt.Style_Check;
2329 Save_C_Restrict : Save_Cunit_Boolean_Restrictions;
2332 U := Unit (Library_Unit (N));
2334 -- If this is an internal unit which is a renaming, then this is a
2335 -- violation of No_Obsolescent_Features.
2337 -- Note: this is not quite right if the user defines one of these units
2338 -- himself, but that's a marginal case, and fixing it is hard ???
2340 if Restriction_Check_Required (No_Obsolescent_Features) then
2342 F : constant File_Name_Type :=
2343 Unit_File_Name (Get_Source_Unit (U));
2345 if Is_Predefined_File_Name (F, Renamings_Included => True)
2347 Is_Predefined_File_Name (F, Renamings_Included => False)
2349 Check_Restriction (No_Obsolescent_Features, N);
2354 -- Save current restriction set, does not apply to with'ed unit
2356 Save_C_Restrict := Cunit_Boolean_Restrictions_Save;
2358 -- Several actions are skipped for dummy packages (those supplied for
2359 -- with's where no matching file could be found). Such packages are
2360 -- identified by the Sloc value being set to No_Location.
2362 if Limited_Present (N) then
2364 -- Ada 2005 (AI-50217): Build visibility structures but do not
2365 -- analyze the unit.
2367 if Sloc (U) /= No_Location then
2368 Build_Limited_Views (N);
2374 -- We reset ordinary style checking during the analysis of a with'ed
2375 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2376 -- definitely *does* apply to with'ed units).
2378 if not GNAT_Mode then
2379 Style_Check := False;
2382 -- If the library unit is a predefined unit, and we are in high
2383 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2384 -- for the analysis of the with'ed unit. This mode does not prevent
2385 -- explicit with'ing of run-time units.
2387 if Configurable_Run_Time_Mode
2388 and then Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (U)))
2390 Configurable_Run_Time_Mode := False;
2391 Semantics (Library_Unit (N));
2392 Configurable_Run_Time_Mode := True;
2395 Semantics (Library_Unit (N));
2398 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2400 if Sloc (U) /= No_Location then
2402 -- Check restrictions, except that we skip the check if this is an
2403 -- internal unit unless we are compiling the internal unit as the
2404 -- main unit. We also skip this for dummy packages.
2406 Check_Restriction_No_Dependence (Nam, N);
2408 if not Intunit or else Current_Sem_Unit = Main_Unit then
2409 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2412 -- Deal with special case of GNAT.Current_Exceptions which interacts
2413 -- with the optimization of local raise statements into gotos.
2415 if Nkind (Nam) = N_Selected_Component
2416 and then Nkind (Prefix (Nam)) = N_Identifier
2417 and then Chars (Prefix (Nam)) = Name_Gnat
2418 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2420 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2422 Check_Restriction (No_Exception_Propagation, N);
2423 Special_Exception_Package_Used := True;
2426 -- Check for inappropriate with of internal implementation unit if we
2427 -- are not compiling an internal unit. We do not issue this message
2428 -- for implicit with's generated by the compiler itself.
2430 if Implementation_Unit_Warnings
2431 and then not Intunit
2432 and then not Implicit_With (N)
2435 U_Kind : constant Kind_Of_Unit :=
2436 Get_Kind_Of_Unit (Get_Source_Unit (U));
2439 if U_Kind = Implementation_Unit then
2440 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2442 -- Add alternative name if available, otherwise issue a
2443 -- general warning message.
2445 if Error_Msg_Strlen /= 0 then
2446 Error_Msg_F ("\use ""~"" instead", Name (N));
2449 ("\use of this unit is non-portable " &
2450 "and version-dependent?", Name (N));
2453 elsif U_Kind = Ada_2005_Unit
2454 and then Ada_Version < Ada_2005
2455 and then Warn_On_Ada_2005_Compatibility
2457 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2459 elsif U_Kind = Ada_2012_Unit
2460 and then Ada_Version < Ada_2012
2461 and then Warn_On_Ada_2012_Compatibility
2463 Error_Msg_N ("& is an Ada 2012 unit?", Name (N));
2469 -- Semantic analysis of a generic unit is performed on a copy of
2470 -- the original tree. Retrieve the entity on which semantic info
2471 -- actually appears.
2473 if Unit_Kind in N_Generic_Declaration then
2474 E_Name := Defining_Entity (U);
2476 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2477 -- the case of an instantiation, semantic analysis above will have
2478 -- replaced the unit by its instantiated version. If the instance body
2479 -- has been generated, the instance now denotes the body entity. For
2480 -- visibility purposes we need the entity of its spec.
2482 elsif (Unit_Kind = N_Package_Instantiation
2483 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2484 N_Package_Instantiation)
2485 and then Nkind (U) = N_Package_Body
2487 E_Name := Corresponding_Spec (U);
2489 elsif Unit_Kind = N_Package_Instantiation
2490 and then Nkind (U) = N_Package_Instantiation
2491 and then Present (Instance_Spec (U))
2493 -- If the instance has not been rewritten as a package declaration,
2494 -- then it appeared already in a previous with clause. Retrieve
2495 -- the entity from the previous instance.
2497 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2499 elsif Unit_Kind in N_Subprogram_Instantiation then
2501 -- The visible subprogram is created during instantiation, and is
2502 -- an attribute of the wrapper package. We retrieve the wrapper
2503 -- package directly from the instantiation node. If the instance
2504 -- is inlined the unit is still an instantiation. Otherwise it has
2505 -- been rewritten as the declaration of the wrapper itself.
2507 if Nkind (U) in N_Subprogram_Instantiation then
2510 (Defining_Entity (Specification (Instance_Spec (U))));
2512 E_Name := Related_Instance (Defining_Entity (U));
2515 elsif Unit_Kind = N_Package_Renaming_Declaration
2516 or else Unit_Kind in N_Generic_Renaming_Declaration
2518 E_Name := Defining_Entity (U);
2520 elsif Unit_Kind = N_Subprogram_Body
2521 and then Nkind (Name (N)) = N_Selected_Component
2522 and then not Acts_As_Spec (Library_Unit (N))
2524 -- For a child unit that has no spec, one has been created and
2525 -- analyzed. The entity required is that of the spec.
2527 E_Name := Corresponding_Spec (U);
2530 E_Name := Defining_Entity (U);
2533 if Nkind (Name (N)) = N_Selected_Component then
2535 -- Child unit in a with clause
2537 Change_Selected_Component_To_Expanded_Name (Name (N));
2540 -- Restore style checks and restrictions
2542 Style_Check := Save_Style_Check;
2543 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2545 -- Record the reference, but do NOT set the unit as referenced, we want
2546 -- to consider the unit as unreferenced if this is the only reference
2549 Set_Entity_With_Style_Check (Name (N), E_Name);
2550 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2552 -- Generate references and check No_Dependence restriction for parents
2554 if Is_Child_Unit (E_Name) then
2555 Pref := Prefix (Name (N));
2556 Par_Name := Scope (E_Name);
2557 while Nkind (Pref) = N_Selected_Component loop
2558 Change_Selected_Component_To_Expanded_Name (Pref);
2560 if Present (Entity (Selector_Name (Pref)))
2562 Present (Renamed_Entity (Entity (Selector_Name (Pref))))
2563 and then Entity (Selector_Name (Pref)) /= Par_Name
2565 -- The prefix is a child unit that denotes a renaming declaration.
2566 -- Replace the prefix directly with the renamed unit, because the
2567 -- rest of the prefix is irrelevant to the visibility of the real
2570 Rewrite (Pref, New_Occurrence_Of (Par_Name, Sloc (Pref)));
2574 Set_Entity_With_Style_Check (Pref, Par_Name);
2576 Generate_Reference (Par_Name, Pref);
2577 Check_Restriction_No_Dependence (Pref, N);
2578 Pref := Prefix (Pref);
2580 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2581 -- is set to Standard_Standard, and no attempt should be made to
2582 -- further unwind scopes.
2584 if Par_Name /= Standard_Standard then
2585 Par_Name := Scope (Par_Name);
2589 if Present (Entity (Pref))
2590 and then not Analyzed (Parent (Parent (Entity (Pref))))
2592 -- If the entity is set without its unit being compiled, the
2593 -- original parent is a renaming, and Par_Name is the renamed
2594 -- entity. For visibility purposes, we need the original entity,
2595 -- which must be analyzed now because Load_Unit directly retrieves
2596 -- the renamed unit, and the renaming declaration itself has not
2599 Analyze (Parent (Parent (Entity (Pref))));
2600 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2601 Par_Name := Entity (Pref);
2604 Set_Entity_With_Style_Check (Pref, Par_Name);
2605 Generate_Reference (Par_Name, Pref);
2608 -- If the withed unit is System, and a system extension pragma is
2609 -- present, compile the extension now, rather than waiting for a
2610 -- visibility check on a specific entity.
2612 if Chars (E_Name) = Name_System
2613 and then Scope (E_Name) = Standard_Standard
2614 and then Present (System_Extend_Unit)
2615 and then Present_System_Aux (N)
2617 -- If the extension is not present, an error will have been emitted
2622 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2623 -- to private_with units; they will be made visible later (just before
2624 -- the private part is analyzed)
2626 if Private_Present (N) then
2627 Set_Is_Immediately_Visible (E_Name, False);
2629 end Analyze_With_Clause;
2631 ------------------------------
2632 -- Check_Private_Child_Unit --
2633 ------------------------------
2635 procedure Check_Private_Child_Unit (N : Node_Id) is
2636 Lib_Unit : constant Node_Id := Unit (N);
2638 Curr_Unit : Entity_Id;
2639 Sub_Parent : Node_Id;
2640 Priv_Child : Entity_Id;
2641 Par_Lib : Entity_Id;
2644 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2645 -- Returns true if and only if the library unit is declared with
2646 -- an explicit designation of private.
2648 -----------------------------
2649 -- Is_Private_Library_Unit --
2650 -----------------------------
2652 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2653 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2656 return Private_Present (Comp_Unit);
2657 end Is_Private_Library_Unit;
2659 -- Start of processing for Check_Private_Child_Unit
2662 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2663 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2664 Par_Lib := Curr_Unit;
2666 elsif Nkind (Lib_Unit) = N_Subunit then
2668 -- The parent is itself a body. The parent entity is to be found in
2669 -- the corresponding spec.
2671 Sub_Parent := Library_Unit (N);
2672 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2674 -- If the parent itself is a subunit, Curr_Unit is the entity of the
2675 -- enclosing body, retrieve the spec entity which is the proper
2676 -- ancestor we need for the following tests.
2678 if Ekind (Curr_Unit) = E_Package_Body then
2679 Curr_Unit := Spec_Entity (Curr_Unit);
2682 Par_Lib := Curr_Unit;
2685 Curr_Unit := Defining_Entity (Lib_Unit);
2687 Par_Lib := Curr_Unit;
2688 Par_Spec := Parent_Spec (Lib_Unit);
2690 if No (Par_Spec) then
2693 Par_Lib := Defining_Entity (Unit (Par_Spec));
2697 -- Loop through context items
2699 Item := First (Context_Items (N));
2700 while Present (Item) loop
2702 -- Ada 2005 (AI-262): Allow private_with of a private child package
2703 -- in public siblings
2705 if Nkind (Item) = N_With_Clause
2706 and then not Implicit_With (Item)
2707 and then not Limited_Present (Item)
2708 and then Is_Private_Descendant (Entity (Name (Item)))
2710 Priv_Child := Entity (Name (Item));
2713 Curr_Parent : Entity_Id := Par_Lib;
2714 Child_Parent : Entity_Id := Scope (Priv_Child);
2715 Prv_Ancestor : Entity_Id := Child_Parent;
2716 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2719 -- If the child unit is a public child then locate the nearest
2720 -- private ancestor. Child_Parent will then be set to the
2721 -- parent of that ancestor.
2723 if not Is_Private_Library_Unit (Priv_Child) then
2724 while Present (Prv_Ancestor)
2725 and then not Is_Private_Library_Unit (Prv_Ancestor)
2727 Prv_Ancestor := Scope (Prv_Ancestor);
2730 if Present (Prv_Ancestor) then
2731 Child_Parent := Scope (Prv_Ancestor);
2735 while Present (Curr_Parent)
2736 and then Curr_Parent /= Standard_Standard
2737 and then Curr_Parent /= Child_Parent
2740 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2741 Curr_Parent := Scope (Curr_Parent);
2744 if No (Curr_Parent) then
2745 Curr_Parent := Standard_Standard;
2748 if Curr_Parent /= Child_Parent then
2749 if Ekind (Priv_Child) = E_Generic_Package
2750 and then Chars (Priv_Child) in Text_IO_Package_Name
2751 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2754 ("& is a nested package, not a compilation unit",
2755 Name (Item), Priv_Child);
2759 ("unit in with clause is private child unit!", Item);
2761 ("\current unit must also have parent&!",
2762 Item, Child_Parent);
2766 or else Private_Present (Item)
2767 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2768 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2769 and then not Acts_As_Spec (Parent (Lib_Unit)))
2775 ("current unit must also be private descendant of&",
2776 Item, Child_Parent);
2784 end Check_Private_Child_Unit;
2786 ----------------------
2787 -- Check_Stub_Level --
2788 ----------------------
2790 procedure Check_Stub_Level (N : Node_Id) is
2791 Par : constant Node_Id := Parent (N);
2792 Kind : constant Node_Kind := Nkind (Par);
2795 if Nkind_In (Kind, N_Package_Body,
2799 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2803 -- In an instance, a missing stub appears at any level. A warning
2804 -- message will have been emitted already for the missing file.
2806 elsif not In_Instance then
2807 Error_Msg_N ("stub cannot appear in an inner scope", N);
2809 elsif Expander_Active then
2810 Error_Msg_N ("missing proper body", N);
2812 end Check_Stub_Level;
2814 ------------------------
2815 -- Expand_With_Clause --
2816 ------------------------
2818 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2819 Loc : constant Source_Ptr := Sloc (Nam);
2820 Ent : constant Entity_Id := Entity (Nam);
2824 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2825 -- Build name to be used in implicit with_clause. In most cases this
2826 -- is the source name, but if renamings are present we must make the
2827 -- original unit visible, not the one it renames. The entity in the
2828 -- with clause is the renamed unit, but the identifier is the one from
2829 -- the source, which allows us to recover the unit renaming.
2831 ---------------------
2832 -- Build_Unit_Name --
2833 ---------------------
2835 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2837 Renaming : Entity_Id;
2841 if Nkind (Nam) = N_Identifier then
2843 -- If the parent unit P in the name of the with_clause for P.Q is
2844 -- a renaming of package R, then the entity of the parent is set
2845 -- to R, but the identifier retains Chars (P) to be consistent
2846 -- with the source (see details in lib-load). However the implicit
2847 -- with_clause for the parent must make the entity for P visible,
2848 -- because P.Q may be used as a prefix within the current unit.
2849 -- The entity for P is the current_entity with that name, because
2850 -- the package renaming declaration for it has just been analyzed.
2851 -- Note that this case can only happen if P.Q has already appeared
2852 -- in a previous with_clause in a related unit, such as the
2853 -- library body of the current unit.
2855 if Chars (Nam) /= Chars (Entity (Nam)) then
2856 Renaming := Current_Entity (Nam);
2857 pragma Assert (Renamed_Entity (Renaming) = Entity (Nam));
2858 return New_Occurrence_Of (Renaming, Loc);
2861 return New_Occurrence_Of (Entity (Nam), Loc);
2865 Ent := Entity (Nam);
2867 if Present (Entity (Selector_Name (Nam)))
2868 and then Chars (Entity (Selector_Name (Nam))) /= Chars (Ent)
2870 Nkind (Unit_Declaration_Node (Entity (Selector_Name (Nam))))
2871 = N_Package_Renaming_Declaration
2873 -- The name in the with_clause is of the form A.B.C, and B is
2874 -- given by a renaming declaration. In that case we may not
2875 -- have analyzed the unit for B, but replaced it directly in
2876 -- lib-load with the unit it renames. We have to make A.B
2877 -- visible, so analyze the declaration for B now, in case it
2878 -- has not been done yet.
2880 Ent := Entity (Selector_Name (Nam));
2883 (Unit_Declaration_Node (Entity (Selector_Name (Nam)))));
2887 Make_Expanded_Name (Loc,
2888 Chars => Chars (Entity (Nam)),
2889 Prefix => Build_Unit_Name (Prefix (Nam)),
2890 Selector_Name => New_Occurrence_Of (Ent, Loc));
2891 Set_Entity (Result, Ent);
2894 end Build_Unit_Name;
2896 -- Start of processing for Expand_With_Clause
2899 New_Nodes_OK := New_Nodes_OK + 1;
2901 Make_With_Clause (Loc,
2902 Name => Build_Unit_Name (Nam));
2904 P := Parent (Unit_Declaration_Node (Ent));
2905 Set_Library_Unit (Withn, P);
2906 Set_Corresponding_Spec (Withn, Ent);
2907 Set_First_Name (Withn, True);
2908 Set_Implicit_With (Withn, True);
2910 -- If the unit is a package declaration, a private_with_clause on a
2911 -- child unit implies the implicit with on the parent is also private.
2913 if Nkind (Unit (N)) = N_Package_Declaration then
2914 Set_Private_Present (Withn, Private_Present (Item));
2917 Prepend (Withn, Context_Items (N));
2918 Mark_Rewrite_Insertion (Withn);
2919 Install_Withed_Unit (Withn);
2921 if Nkind (Nam) = N_Expanded_Name then
2922 Expand_With_Clause (Item, Prefix (Nam), N);
2925 New_Nodes_OK := New_Nodes_OK - 1;
2926 end Expand_With_Clause;
2928 -----------------------
2929 -- Get_Parent_Entity --
2930 -----------------------
2932 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2934 if Nkind (Unit) = N_Package_Body
2935 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2937 return Defining_Entity
2938 (Specification (Instance_Spec (Original_Node (Unit))));
2939 elsif Nkind (Unit) = N_Package_Instantiation then
2940 return Defining_Entity (Specification (Instance_Spec (Unit)));
2942 return Defining_Entity (Unit);
2944 end Get_Parent_Entity;
2946 ---------------------
2947 -- Has_With_Clause --
2948 ---------------------
2950 function Has_With_Clause
2953 Is_Limited : Boolean := False) return Boolean
2957 function Named_Unit (Clause : Node_Id) return Entity_Id;
2958 -- Return the entity for the unit named in a [limited] with clause
2964 function Named_Unit (Clause : Node_Id) return Entity_Id is
2966 if Nkind (Name (Clause)) = N_Selected_Component then
2967 return Entity (Selector_Name (Name (Clause)));
2969 return Entity (Name (Clause));
2973 -- Start of processing for Has_With_Clause
2976 if Present (Context_Items (C_Unit)) then
2977 Item := First (Context_Items (C_Unit));
2978 while Present (Item) loop
2979 if Nkind (Item) = N_With_Clause
2980 and then Limited_Present (Item) = Is_Limited
2981 and then Named_Unit (Item) = Pack
2991 end Has_With_Clause;
2993 -----------------------------
2994 -- Implicit_With_On_Parent --
2995 -----------------------------
2997 procedure Implicit_With_On_Parent
2998 (Child_Unit : Node_Id;
3001 Loc : constant Source_Ptr := Sloc (N);
3002 P : constant Node_Id := Parent_Spec (Child_Unit);
3003 P_Unit : Node_Id := Unit (P);
3004 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
3007 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
3008 -- Build prefix of child unit name. Recurse if needed
3010 function Build_Unit_Name return Node_Id;
3011 -- If the unit is a child unit, build qualified name with all ancestors
3013 -------------------------
3014 -- Build_Ancestor_Name --
3015 -------------------------
3017 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
3018 P_Ref : constant Node_Id :=
3019 New_Reference_To (Defining_Entity (P), Loc);
3020 P_Spec : Node_Id := P;
3023 -- Ancestor may have been rewritten as a package body. Retrieve
3024 -- the original spec to trace earlier ancestors.
3026 if Nkind (P) = N_Package_Body
3027 and then Nkind (Original_Node (P)) = N_Package_Instantiation
3029 P_Spec := Original_Node (P);
3032 if No (Parent_Spec (P_Spec)) then
3036 Make_Selected_Component (Loc,
3037 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
3038 Selector_Name => P_Ref);
3040 end Build_Ancestor_Name;
3042 ---------------------
3043 -- Build_Unit_Name --
3044 ---------------------
3046 function Build_Unit_Name return Node_Id is
3050 if No (Parent_Spec (P_Unit)) then
3051 return New_Reference_To (P_Name, Loc);
3055 Make_Expanded_Name (Loc,
3056 Chars => Chars (P_Name),
3057 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
3058 Selector_Name => New_Reference_To (P_Name, Loc));
3059 Set_Entity (Result, P_Name);
3062 end Build_Unit_Name;
3064 -- Start of processing for Implicit_With_On_Parent
3067 -- The unit of the current compilation may be a package body that
3068 -- replaces an instance node. In this case we need the original instance
3069 -- node to construct the proper parent name.
3071 if Nkind (P_Unit) = N_Package_Body
3072 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
3074 P_Unit := Original_Node (P_Unit);
3077 -- We add the implicit with if the child unit is the current unit being
3078 -- compiled. If the current unit is a body, we do not want to add an
3079 -- implicit_with a second time to the corresponding spec.
3081 if Nkind (Child_Unit) = N_Package_Declaration
3082 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
3087 New_Nodes_OK := New_Nodes_OK + 1;
3088 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
3090 Set_Library_Unit (Withn, P);
3091 Set_Corresponding_Spec (Withn, P_Name);
3092 Set_First_Name (Withn, True);
3093 Set_Implicit_With (Withn, True);
3095 -- Node is placed at the beginning of the context items, so that
3096 -- subsequent use clauses on the parent can be validated.
3098 Prepend (Withn, Context_Items (N));
3099 Mark_Rewrite_Insertion (Withn);
3100 Install_Withed_Unit (Withn);
3102 if Is_Child_Spec (P_Unit) then
3103 Implicit_With_On_Parent (P_Unit, N);
3106 New_Nodes_OK := New_Nodes_OK - 1;
3107 end Implicit_With_On_Parent;
3113 function In_Chain (E : Entity_Id) return Boolean is
3117 H := Current_Entity (E);
3118 while Present (H) loop
3129 ---------------------
3130 -- Install_Context --
3131 ---------------------
3133 procedure Install_Context (N : Node_Id) is
3134 Lib_Unit : constant Node_Id := Unit (N);
3137 Install_Context_Clauses (N);
3139 if Is_Child_Spec (Lib_Unit) then
3140 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
3143 Install_Limited_Context_Clauses (N);
3144 end Install_Context;
3146 -----------------------------
3147 -- Install_Context_Clauses --
3148 -----------------------------
3150 procedure Install_Context_Clauses (N : Node_Id) is
3151 Lib_Unit : constant Node_Id := Unit (N);
3153 Uname_Node : Entity_Id;
3154 Check_Private : Boolean := False;
3155 Decl_Node : Node_Id;
3156 Lib_Parent : Entity_Id;
3159 -- First skip configuration pragmas at the start of the context. They
3160 -- are not technically part of the context clause, but that's where the
3161 -- parser puts them. Note they were analyzed in Analyze_Context.
3163 Item := First (Context_Items (N));
3164 while Present (Item)
3165 and then Nkind (Item) = N_Pragma
3166 and then Pragma_Name (Item) in Configuration_Pragma_Names
3171 -- Loop through the actual context clause items. We process everything
3172 -- except Limited_With clauses in this routine. Limited_With clauses
3173 -- are separately installed (see Install_Limited_Context_Clauses).
3175 while Present (Item) loop
3177 -- Case of explicit WITH clause
3179 if Nkind (Item) = N_With_Clause
3180 and then not Implicit_With (Item)
3182 if Limited_Present (Item) then
3184 -- Limited withed units will be installed later
3188 -- If Name (Item) is not an entity name, something is wrong, and
3189 -- this will be detected in due course, for now ignore the item
3191 elsif not Is_Entity_Name (Name (Item)) then
3194 elsif No (Entity (Name (Item))) then
3195 Set_Entity (Name (Item), Any_Id);
3199 Uname_Node := Entity (Name (Item));
3201 if Is_Private_Descendant (Uname_Node) then
3202 Check_Private := True;
3205 Install_Withed_Unit (Item);
3207 Decl_Node := Unit_Declaration_Node (Uname_Node);
3209 -- If the unit is a subprogram instance, it appears nested within
3210 -- a package that carries the parent information.
3212 if Is_Generic_Instance (Uname_Node)
3213 and then Ekind (Uname_Node) /= E_Package
3215 Decl_Node := Parent (Parent (Decl_Node));
3218 if Is_Child_Spec (Decl_Node) then
3219 if Nkind (Name (Item)) = N_Expanded_Name then
3220 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3222 -- If not an expanded name, the child unit must be a
3223 -- renaming, nothing to do.
3228 elsif Nkind (Decl_Node) = N_Subprogram_Body
3229 and then not Acts_As_Spec (Parent (Decl_Node))
3230 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3232 Implicit_With_On_Parent
3233 (Unit (Library_Unit (Parent (Decl_Node))), N);
3236 -- Check license conditions unless this is a dummy unit
3238 if Sloc (Library_Unit (Item)) /= No_Location then
3239 License_Check : declare
3240 Withu : constant Unit_Number_Type :=
3241 Get_Source_Unit (Library_Unit (Item));
3242 Withl : constant License_Type :=
3243 License (Source_Index (Withu));
3244 Unitl : constant License_Type :=
3245 License (Source_Index (Current_Sem_Unit));
3247 procedure License_Error;
3248 -- Signal error of bad license
3254 procedure License_Error is
3257 ("?license of with'ed unit & may be inconsistent",
3261 -- Start of processing for License_Check
3264 -- Exclude license check if withed unit is an internal unit.
3265 -- This situation arises e.g. with the GPL version of GNAT.
3267 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3270 -- Otherwise check various cases
3282 if Withl = Restricted then
3286 when Modified_GPL =>
3287 if Withl = Restricted or else Withl = GPL then
3291 when Unrestricted =>
3298 -- Case of USE PACKAGE clause
3300 elsif Nkind (Item) = N_Use_Package_Clause then
3301 Analyze_Use_Package (Item);
3303 -- Case of USE TYPE clause
3305 elsif Nkind (Item) = N_Use_Type_Clause then
3306 Analyze_Use_Type (Item);
3310 elsif Nkind (Item) = N_Pragma then
3318 if Is_Child_Spec (Lib_Unit) then
3320 -- The unit also has implicit with_clauses on its own parents
3322 if No (Context_Items (N)) then
3323 Set_Context_Items (N, New_List);
3326 Implicit_With_On_Parent (Lib_Unit, N);
3329 -- If the unit is a body, the context of the specification must also
3330 -- be installed. That includes private with_clauses in that context.
3332 if Nkind (Lib_Unit) = N_Package_Body
3333 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3334 and then not Acts_As_Spec (N))
3336 Install_Context (Library_Unit (N));
3338 -- Only install private with-clauses of a spec that comes from
3339 -- source, excluding specs created for a subprogram body that is
3342 if Comes_From_Source (Library_Unit (N)) then
3343 Install_Private_With_Clauses
3344 (Defining_Entity (Unit (Library_Unit (N))));
3347 if Is_Child_Spec (Unit (Library_Unit (N))) then
3349 -- If the unit is the body of a public child unit, the private
3350 -- declarations of the parent must be made visible. If the child
3351 -- unit is private, the private declarations have been installed
3352 -- already in the call to Install_Parents for the spec. Installing
3353 -- private declarations must be done for all ancestors of public
3354 -- child units. In addition, sibling units mentioned in the
3355 -- context clause of the body are directly visible.
3363 Lib_Spec := Unit (Library_Unit (N));
3364 while Is_Child_Spec (Lib_Spec) loop
3365 P := Unit (Parent_Spec (Lib_Spec));
3366 P_Name := Defining_Entity (P);
3368 if not (Private_Present (Parent (Lib_Spec)))
3369 and then not In_Private_Part (P_Name)
3371 Install_Private_Declarations (P_Name);
3372 Install_Private_With_Clauses (P_Name);
3373 Set_Use (Private_Declarations (Specification (P)));
3381 -- For a package body, children in context are immediately visible
3383 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3386 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3387 N_Generic_Subprogram_Declaration,
3388 N_Package_Declaration,
3389 N_Subprogram_Declaration)
3391 if Is_Child_Spec (Lib_Unit) then
3392 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3393 Set_Is_Private_Descendant
3394 (Defining_Entity (Lib_Unit),
3395 Is_Private_Descendant (Lib_Parent)
3396 or else Private_Present (Parent (Lib_Unit)));
3399 Set_Is_Private_Descendant
3400 (Defining_Entity (Lib_Unit),
3401 Private_Present (Parent (Lib_Unit)));
3405 if Check_Private then
3406 Check_Private_Child_Unit (N);
3408 end Install_Context_Clauses;
3410 -------------------------------------
3411 -- Install_Limited_Context_Clauses --
3412 -------------------------------------
3414 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3417 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3418 -- Check that the unlimited view of a given compilation_unit is not
3419 -- already visible through "use + renamings".
3421 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3422 -- Check that if a limited_with clause of a given compilation_unit
3423 -- mentions a descendant of a private child of some library unit, then
3424 -- the given compilation_unit shall be the declaration of a private
3425 -- descendant of that library unit, or a public descendant of such. The
3426 -- code is analogous to that of Check_Private_Child_Unit but we cannot
3427 -- use entities on the limited with_clauses because their units have not
3428 -- been analyzed, so we have to climb the tree of ancestors looking for
3429 -- private keywords.
3431 procedure Expand_Limited_With_Clause
3432 (Comp_Unit : Node_Id;
3435 -- If a child unit appears in a limited_with clause, there are implicit
3436 -- limited_with clauses on all parents that are not already visible
3437 -- through a regular with clause. This procedure creates the implicit
3438 -- limited with_clauses for the parents and loads the corresponding
3439 -- units. The shadow entities are created when the inserted clause is
3440 -- analyzed. Implements Ada 2005 (AI-50217).
3442 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean;
3443 -- When compiling a unit Q descended from some parent unit P, a limited
3444 -- with_clause in the context of P that names some other ancestor of Q
3445 -- must not be installed because the ancestor is immediately visible.
3447 ---------------------
3448 -- Check_Renamings --
3449 ---------------------
3451 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3460 pragma Assert (Nkind (W) = N_With_Clause);
3462 -- Protect the frontend against previous critical errors
3464 case Nkind (Unit (Library_Unit (W))) is
3465 when N_Subprogram_Declaration |
3466 N_Package_Declaration |
3467 N_Generic_Subprogram_Declaration |
3468 N_Generic_Package_Declaration =>
3475 -- Check "use + renamings"
3477 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3478 Spec := Specification (Unit (P));
3480 Item := First (Visible_Declarations (Spec));
3481 while Present (Item) loop
3483 -- Look only at use package clauses
3485 if Nkind (Item) = N_Use_Package_Clause then
3487 -- Traverse the list of packages
3489 Nam := First (Names (Item));
3490 while Present (Nam) loop
3493 pragma Assert (Present (Parent (E)));
3495 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3496 and then Renamed_Entity (E) = WEnt
3498 -- The unlimited view is visible through use clause and
3499 -- renamings. There is no need to generate the error
3500 -- message here because Is_Visible_Through_Renamings
3501 -- takes care of generating the precise error message.
3505 elsif Nkind (Parent (E)) = N_Package_Specification then
3507 -- The use clause may refer to a local package.
3508 -- Check all the enclosing scopes.
3511 while E2 /= Standard_Standard
3519 ("unlimited view visible through use clause ", W);
3531 -- Recursive call to check all the ancestors
3533 if Is_Child_Spec (Unit (P)) then
3534 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3536 end Check_Renamings;
3538 ---------------------------------------
3539 -- Check_Private_Limited_Withed_Unit --
3540 ---------------------------------------
3542 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3543 Curr_Parent : Node_Id;
3544 Child_Parent : Node_Id;
3545 Curr_Private : Boolean;
3548 -- Compilation unit of the parent of the withed library unit
3550 Child_Parent := Library_Unit (Item);
3552 -- If the child unit is a public child, then locate its nearest
3553 -- private ancestor, if any, then Child_Parent will then be set to
3554 -- the parent of that ancestor.
3556 if not Private_Present (Library_Unit (Item)) then
3557 while Present (Child_Parent)
3558 and then not Private_Present (Child_Parent)
3560 Child_Parent := Parent_Spec (Unit (Child_Parent));
3563 if No (Child_Parent) then
3568 Child_Parent := Parent_Spec (Unit (Child_Parent));
3570 -- Traverse all the ancestors of the current compilation unit to
3571 -- check if it is a descendant of named library unit.
3573 Curr_Parent := Parent (Item);
3574 Curr_Private := Private_Present (Curr_Parent);
3576 while Present (Parent_Spec (Unit (Curr_Parent)))
3577 and then Curr_Parent /= Child_Parent
3579 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3580 Curr_Private := Curr_Private or else Private_Present (Curr_Parent);
3583 if Curr_Parent /= Child_Parent then
3585 ("unit in with clause is private child unit!", Item);
3587 ("\current unit must also have parent&!",
3588 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3590 elsif Private_Present (Parent (Item))
3591 or else Curr_Private
3592 or else Private_Present (Item)
3593 or else Nkind_In (Unit (Parent (Item)), N_Package_Body,
3597 -- Current unit is private, of descendant of a private unit
3603 ("current unit must also be private descendant of&",
3604 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3606 end Check_Private_Limited_Withed_Unit;
3608 --------------------------------
3609 -- Expand_Limited_With_Clause --
3610 --------------------------------
3612 procedure Expand_Limited_With_Clause
3613 (Comp_Unit : Node_Id;
3617 Loc : constant Source_Ptr := Sloc (Nam);
3618 Unum : Unit_Number_Type;
3621 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3622 -- Returns true if the context already includes a with_clause for
3623 -- this unit. If the with_clause is non-limited, the unit is fully
3624 -- visible and an implicit limited_with should not be created. If
3625 -- there is already a limited_with clause for W, a second one is
3626 -- simply redundant.
3628 --------------------------
3629 -- Previous_Withed_Unit --
3630 --------------------------
3632 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3636 -- A limited with_clause cannot appear in the same context_clause
3637 -- as a nonlimited with_clause which mentions the same library.
3639 Item := First (Context_Items (Comp_Unit));
3640 while Present (Item) loop
3641 if Nkind (Item) = N_With_Clause
3642 and then Library_Unit (Item) = Library_Unit (W)
3651 end Previous_Withed_Unit;
3653 -- Start of processing for Expand_Limited_With_Clause
3656 New_Nodes_OK := New_Nodes_OK + 1;
3658 if Nkind (Nam) = N_Identifier then
3660 -- Create node for name of withed unit
3663 Make_With_Clause (Loc,
3664 Name => New_Copy (Nam));
3666 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3668 Make_With_Clause (Loc,
3669 Name => Make_Selected_Component (Loc,
3670 Prefix => New_Copy_Tree (Prefix (Nam)),
3671 Selector_Name => New_Copy (Selector_Name (Nam))));
3672 Set_Parent (Withn, Parent (N));
3675 Set_Limited_Present (Withn);
3676 Set_First_Name (Withn);
3677 Set_Implicit_With (Withn);
3681 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3686 -- Do not generate a limited_with_clause on the current unit. This
3687 -- path is taken when a unit has a limited_with clause on one of its
3690 if Unum = Current_Sem_Unit then
3694 Set_Library_Unit (Withn, Cunit (Unum));
3695 Set_Corresponding_Spec
3696 (Withn, Specification (Unit (Cunit (Unum))));
3698 if not Previous_Withed_Unit (Withn) then
3699 Prepend (Withn, Context_Items (Parent (N)));
3700 Mark_Rewrite_Insertion (Withn);
3702 -- Add implicit limited_with_clauses for parents of child units
3703 -- mentioned in limited_with clauses.
3705 if Nkind (Nam) = N_Selected_Component then
3706 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3711 if not Limited_View_Installed (Withn) then
3712 Install_Limited_Withed_Unit (Withn);
3716 New_Nodes_OK := New_Nodes_OK - 1;
3717 end Expand_Limited_With_Clause;
3719 ----------------------
3720 -- Is_Ancestor_Unit --
3721 ----------------------
3723 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean is
3724 E1 : constant Entity_Id := Defining_Entity (Unit (U1));
3727 if Nkind_In (Unit (U2), N_Package_Body, N_Subprogram_Body) then
3728 E2 := Defining_Entity (Unit (Library_Unit (U2)));
3729 return Is_Ancestor_Package (E1, E2);
3733 end Is_Ancestor_Unit;
3735 -- Start of processing for Install_Limited_Context_Clauses
3738 Item := First (Context_Items (N));
3739 while Present (Item) loop
3740 if Nkind (Item) = N_With_Clause
3741 and then Limited_Present (Item)
3742 and then not Error_Posted (Item)
3744 if Nkind (Name (Item)) = N_Selected_Component then
3745 Expand_Limited_With_Clause
3746 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3749 Check_Private_Limited_Withed_Unit (Item);
3751 if not Implicit_With (Item)
3752 and then Is_Child_Spec (Unit (N))
3754 Check_Renamings (Parent_Spec (Unit (N)), Item);
3757 -- A unit may have a limited with on itself if it has a limited
3758 -- with_clause on one of its child units. In that case it is
3759 -- already being compiled and it makes no sense to install its
3762 -- If the item is a limited_private_with_clause, install it if the
3763 -- current unit is a body or if it is a private child. Otherwise
3764 -- the private clause is installed before analyzing the private
3765 -- part of the current unit.
3767 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3768 and then not Limited_View_Installed (Item)
3770 not Is_Ancestor_Unit
3771 (Library_Unit (Item), Cunit (Current_Sem_Unit))
3773 if not Private_Present (Item)
3774 or else Private_Present (N)
3775 or else Nkind_In (Unit (N), N_Package_Body,
3779 Install_Limited_Withed_Unit (Item);
3787 -- Ada 2005 (AI-412): Examine visible declarations of a package spec,
3788 -- looking for incomplete subtype declarations of incomplete types
3789 -- visible through a limited with clause.
3791 if Ada_Version >= Ada_2005
3792 and then Analyzed (N)
3793 and then Nkind (Unit (N)) = N_Package_Declaration
3798 Non_Lim_View : Entity_Id;
3801 Decl := First (Visible_Declarations (Specification (Unit (N))));
3802 while Present (Decl) loop
3803 if Nkind (Decl) = N_Subtype_Declaration
3805 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3807 From_With_Type (Defining_Identifier (Decl))
3809 Def_Id := Defining_Identifier (Decl);
3810 Non_Lim_View := Non_Limited_View (Def_Id);
3812 if not Is_Incomplete_Type (Non_Lim_View) then
3814 -- Convert an incomplete subtype declaration into a
3815 -- corresponding non-limited view subtype declaration.
3816 -- This is usually the case when analyzing a body that
3817 -- has regular with clauses, when the spec has limited
3820 -- If the non-limited view is still incomplete, it is
3821 -- the dummy entry already created, and the declaration
3822 -- cannot be reanalyzed. This is the case when installing
3823 -- a parent unit that has limited with-clauses.
3825 Set_Subtype_Indication (Decl,
3826 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3827 Set_Etype (Def_Id, Non_Lim_View);
3828 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3829 Set_Analyzed (Decl, False);
3831 -- Reanalyze the declaration, suppressing the call to
3832 -- Enter_Name to avoid duplicate names.
3834 Analyze_Subtype_Declaration
3844 end Install_Limited_Context_Clauses;
3846 ---------------------
3847 -- Install_Parents --
3848 ---------------------
3850 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3857 P := Unit (Parent_Spec (Lib_Unit));
3858 P_Name := Get_Parent_Entity (P);
3860 if Etype (P_Name) = Any_Type then
3864 if Ekind (P_Name) = E_Generic_Package
3865 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3866 N_Generic_Package_Declaration)
3867 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3870 ("child of a generic package must be a generic unit", Lib_Unit);
3872 elsif not Is_Package_Or_Generic_Package (P_Name) then
3874 ("parent unit must be package or generic package", Lib_Unit);
3875 raise Unrecoverable_Error;
3877 elsif Present (Renamed_Object (P_Name)) then
3878 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3879 raise Unrecoverable_Error;
3881 -- Verify that a child of an instance is itself an instance, or the
3882 -- renaming of one. Given that an instance that is a unit is replaced
3883 -- with a package declaration, check against the original node. The
3884 -- parent may be currently being instantiated, in which case it appears
3885 -- as a declaration, but the generic_parent is already established
3886 -- indicating that we deal with an instance.
3888 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3889 if Nkind (Lib_Unit) in N_Renaming_Declaration
3890 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3892 (Nkind (Lib_Unit) = N_Package_Declaration
3893 and then Present (Generic_Parent (Specification (Lib_Unit))))
3898 ("child of an instance must be an instance or renaming",
3903 -- This is the recursive call that ensures all parents are loaded
3905 if Is_Child_Spec (P) then
3907 Is_Private or else Private_Present (Parent (Lib_Unit)));
3910 -- Now we can install the context for this parent
3912 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3913 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3914 Install_Siblings (P_Name, Parent (Lib_Unit));
3916 -- The child unit is in the declarative region of the parent. The parent
3917 -- must therefore appear in the scope stack and be visible, as when
3918 -- compiling the corresponding body. If the child unit is private or it
3919 -- is a package body, private declarations must be accessible as well.
3920 -- Use declarations in the parent must also be installed. Finally, other
3921 -- child units of the same parent that are in the context are
3922 -- immediately visible.
3924 -- Find entity for compilation unit, and set its private descendant
3925 -- status as needed. Indicate that it is a compilation unit, which is
3926 -- redundant in general, but needed if this is a generated child spec
3927 -- for a child body without previous spec.
3929 E_Name := Defining_Entity (Lib_Unit);
3931 Set_Is_Child_Unit (E_Name);
3932 Set_Is_Compilation_Unit (E_Name);
3934 Set_Is_Private_Descendant (E_Name,
3935 Is_Private_Descendant (P_Name)
3936 or else Private_Present (Parent (Lib_Unit)));
3938 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3939 Push_Scope (P_Name);
3941 -- Save current visibility of unit
3943 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3944 Is_Immediately_Visible (P_Name);
3945 Set_Is_Immediately_Visible (P_Name);
3946 Install_Visible_Declarations (P_Name);
3947 Set_Use (Visible_Declarations (P_Spec));
3949 -- If the parent is a generic unit, its formal part may contain formal
3950 -- packages and use clauses for them.
3952 if Ekind (P_Name) = E_Generic_Package then
3953 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3957 or else Private_Present (Parent (Lib_Unit))
3959 Install_Private_Declarations (P_Name);
3960 Install_Private_With_Clauses (P_Name);
3961 Set_Use (Private_Declarations (P_Spec));
3963 end Install_Parents;
3965 ----------------------------------
3966 -- Install_Private_With_Clauses --
3967 ----------------------------------
3969 procedure Install_Private_With_Clauses (P : Entity_Id) is
3970 Decl : constant Node_Id := Unit_Declaration_Node (P);
3974 if Debug_Flag_I then
3975 Write_Str ("install private with clauses of ");
3976 Write_Name (Chars (P));
3980 if Nkind (Parent (Decl)) = N_Compilation_Unit then
3981 Item := First (Context_Items (Parent (Decl)));
3982 while Present (Item) loop
3983 if Nkind (Item) = N_With_Clause
3984 and then Private_Present (Item)
3986 if Limited_Present (Item) then
3987 if not Limited_View_Installed (Item) then
3988 Install_Limited_Withed_Unit (Item);
3991 Install_Withed_Unit (Item, Private_With_OK => True);
3998 end Install_Private_With_Clauses;
4000 ----------------------
4001 -- Install_Siblings --
4002 ----------------------
4004 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
4010 -- Iterate over explicit with clauses, and check whether the scope of
4011 -- each entity is an ancestor of the current unit, in which case it is
4012 -- immediately visible.
4014 Item := First (Context_Items (N));
4015 while Present (Item) loop
4017 -- Do not install private_with_clauses declaration, unless unit
4018 -- is itself a private child unit, or is a body. Note that for a
4019 -- subprogram body the private_with_clause does not take effect until
4020 -- after the specification.
4022 if Nkind (Item) /= N_With_Clause
4023 or else Implicit_With (Item)
4024 or else Limited_Present (Item)
4028 elsif not Private_Present (Item)
4029 or else Private_Present (N)
4030 or else Nkind (Unit (N)) = N_Package_Body
4032 Id := Entity (Name (Item));
4034 if Is_Child_Unit (Id)
4035 and then Is_Ancestor_Package (Scope (Id), U_Name)
4037 Set_Is_Immediately_Visible (Id);
4039 -- Check for the presence of another unit in the context that
4040 -- may be inadvertently hidden by the child.
4042 Prev := Current_Entity (Id);
4045 and then Is_Immediately_Visible (Prev)
4046 and then not Is_Child_Unit (Prev)
4052 Clause := First (Context_Items (N));
4053 while Present (Clause) loop
4054 if Nkind (Clause) = N_With_Clause
4055 and then Entity (Name (Clause)) = Prev
4058 ("child unit& hides compilation unit " &
4059 "with the same name?",
4069 -- The With_Clause may be on a grand-child or one of its further
4070 -- descendants, which makes a child immediately visible. Examine
4071 -- ancestry to determine whether such a child exists. For example,
4072 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
4073 -- is immediately visible.
4075 elsif Is_Child_Unit (Id) then
4081 while Is_Child_Unit (Par) loop
4082 if Is_Ancestor_Package (Scope (Par), U_Name) then
4083 Set_Is_Immediately_Visible (Par);
4092 -- If the item is a private with-clause on a child unit, the parent
4093 -- may have been installed already, but the child unit must remain
4094 -- invisible until installed in a private part or body, unless there
4095 -- is already a regular with_clause for it in the current unit.
4097 elsif Private_Present (Item) then
4098 Id := Entity (Name (Item));
4100 if Is_Child_Unit (Id) then
4104 function In_Context return Boolean;
4105 -- Scan context of current unit, to check whether there is
4106 -- a with_clause on the same unit as a private with-clause
4107 -- on a parent, in which case child unit is visible. If the
4108 -- unit is a grand-child, the same applies to its parent.
4114 function In_Context return Boolean is
4117 First (Context_Items (Cunit (Current_Sem_Unit)));
4118 while Present (Clause) loop
4119 if Nkind (Clause) = N_With_Clause
4120 and then Comes_From_Source (Clause)
4121 and then Is_Entity_Name (Name (Clause))
4122 and then not Private_Present (Clause)
4124 if Entity (Name (Clause)) = Id
4126 (Nkind (Name (Clause)) = N_Expanded_Name
4127 and then Entity (Prefix (Name (Clause))) = Id)
4140 Set_Is_Visible_Child_Unit (Id, In_Context);
4147 end Install_Siblings;
4149 ---------------------------------
4150 -- Install_Limited_Withed_Unit --
4151 ---------------------------------
4153 procedure Install_Limited_Withed_Unit (N : Node_Id) is
4154 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
4157 Is_Child_Package : Boolean := False;
4158 Lim_Header : Entity_Id;
4159 Lim_Typ : Entity_Id;
4161 procedure Check_Body_Required;
4162 -- A unit mentioned in a limited with_clause may not be mentioned in
4163 -- a regular with_clause, but must still be included in the current
4164 -- partition. We need to determine whether the unit needs a body, so
4165 -- that the binder can determine the name of the file to be compiled.
4166 -- Checking whether a unit needs a body can be done without semantic
4167 -- analysis, by examining the nature of the declarations in the package.
4169 function Has_Limited_With_Clause
4170 (C_Unit : Entity_Id;
4171 Pack : Entity_Id) return Boolean;
4172 -- Determine whether any package in the ancestor chain starting with
4173 -- C_Unit has a limited with clause for package Pack.
4175 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
4176 -- Check if some package installed though normal with-clauses has a
4177 -- renaming declaration of package P. AARM 10.1.2(21/2).
4179 -------------------------
4180 -- Check_Body_Required --
4181 -------------------------
4183 procedure Check_Body_Required is
4184 PA : constant List_Id :=
4185 Pragmas_After (Aux_Decls_Node (Parent (P_Unit)));
4187 procedure Check_Declarations (Spec : Node_Id);
4188 -- Recursive procedure that does the work and checks nested packages
4190 ------------------------
4191 -- Check_Declarations --
4192 ------------------------
4194 procedure Check_Declarations (Spec : Node_Id) is
4196 Incomplete_Decls : constant Elist_Id := New_Elmt_List;
4198 Subp_List : constant Elist_Id := New_Elmt_List;
4200 procedure Check_Pragma_Import (P : Node_Id);
4201 -- If a pragma import applies to a previous subprogram, the
4202 -- enclosing unit may not need a body. The processing is syntactic
4203 -- and does not require a declaration to be analyzed. The code
4204 -- below also handles pragma Import when applied to a subprogram
4205 -- that renames another. In this case the pragma applies to the
4208 -- Chains of multiple renames are not handled by the code below.
4209 -- It is probably impossible to handle all cases without proper
4210 -- name resolution. In such cases the algorithm is conservative
4211 -- and will indicate that a body is needed???
4213 -------------------------
4214 -- Check_Pragma_Import --
4215 -------------------------
4217 procedure Check_Pragma_Import (P : Node_Id) is
4223 procedure Remove_Homonyms (E : Node_Id);
4224 -- Make one pass over list of subprograms. Called again if
4225 -- subprogram is a renaming. E is known to be an identifier.
4227 ---------------------
4228 -- Remove_Homonyms --
4229 ---------------------
4231 procedure Remove_Homonyms (E : Node_Id) is
4232 R : Entity_Id := Empty;
4233 -- Name of renamed entity, if any
4236 Subp_Id := First_Elmt (Subp_List);
4237 while Present (Subp_Id) loop
4238 if Chars (Node (Subp_Id)) = Chars (E) then
4239 if Nkind (Parent (Parent (Node (Subp_Id))))
4240 /= N_Subprogram_Renaming_Declaration
4243 Next_Elmt (Subp_Id);
4244 Remove_Elmt (Subp_List, Prev_Id);
4246 R := Name (Parent (Parent (Node (Subp_Id))));
4250 Next_Elmt (Subp_Id);
4255 if Nkind (R) = N_Identifier then
4256 Remove_Homonyms (R);
4258 elsif Nkind (R) = N_Selected_Component then
4259 Remove_Homonyms (Selector_Name (R));
4261 -- Renaming of attribute
4267 end Remove_Homonyms;
4269 -- Start of processing for Check_Pragma_Import
4272 -- Find name of entity in Import pragma. We have not analyzed
4273 -- the construct, so we must guard against syntax errors.
4275 Arg := Next (First (Pragma_Argument_Associations (P)));
4278 or else Nkind (Expression (Arg)) /= N_Identifier
4282 Imported := Expression (Arg);
4285 Remove_Homonyms (Imported);
4286 end Check_Pragma_Import;
4288 -- Start of processing for Check_Declarations
4291 -- Search for Elaborate Body pragma
4293 Decl := First (Visible_Declarations (Spec));
4294 while Present (Decl)
4295 and then Nkind (Decl) = N_Pragma
4297 if Get_Pragma_Id (Decl) = Pragma_Elaborate_Body then
4298 Set_Body_Required (Library_Unit (N));
4305 -- Look for declarations that require the presence of a body. We
4306 -- have already skipped pragmas at the start of the list.
4308 while Present (Decl) loop
4310 -- Subprogram that comes from source means body may be needed.
4311 -- Save for subsequent examination of import pragmas.
4313 if Comes_From_Source (Decl)
4314 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4315 N_Subprogram_Renaming_Declaration,
4316 N_Generic_Subprogram_Declaration))
4318 Append_Elmt (Defining_Entity (Decl), Subp_List);
4320 -- Package declaration of generic package declaration. We need
4321 -- to recursively examine nested declarations.
4323 elsif Nkind_In (Decl, N_Package_Declaration,
4324 N_Generic_Package_Declaration)
4326 Check_Declarations (Specification (Decl));
4328 elsif Nkind (Decl) = N_Pragma
4329 and then Pragma_Name (Decl) = Name_Import
4331 Check_Pragma_Import (Decl);
4337 -- Same set of tests for private part. In addition to subprograms
4338 -- detect the presence of Taft Amendment types (incomplete types
4339 -- completed in the body).
4341 Decl := First (Private_Declarations (Spec));
4342 while Present (Decl) loop
4343 if Comes_From_Source (Decl)
4344 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4345 N_Subprogram_Renaming_Declaration,
4346 N_Generic_Subprogram_Declaration))
4348 Append_Elmt (Defining_Entity (Decl), Subp_List);
4350 elsif Nkind_In (Decl, N_Package_Declaration,
4351 N_Generic_Package_Declaration)
4353 Check_Declarations (Specification (Decl));
4355 -- Collect incomplete type declarations for separate pass
4357 elsif Nkind (Decl) = N_Incomplete_Type_Declaration then
4358 Append_Elmt (Decl, Incomplete_Decls);
4360 elsif Nkind (Decl) = N_Pragma
4361 and then Pragma_Name (Decl) = Name_Import
4363 Check_Pragma_Import (Decl);
4369 -- Now check incomplete declarations to locate Taft amendment
4370 -- types. This can be done by examining the defining identifiers
4371 -- of type declarations without real semantic analysis.
4377 Inc := First_Elmt (Incomplete_Decls);
4378 while Present (Inc) loop
4379 Decl := Next (Node (Inc));
4380 while Present (Decl) loop
4381 if Nkind (Decl) = N_Full_Type_Declaration
4382 and then Chars (Defining_Identifier (Decl)) =
4383 Chars (Defining_Identifier (Node (Inc)))
4391 -- If no completion, this is a TAT, and a body is needed
4394 Set_Body_Required (Library_Unit (N));
4402 -- Finally, check whether there are subprograms that still require
4403 -- a body, i.e. are not renamings or null.
4405 if not Is_Empty_Elmt_List (Subp_List) then
4411 Subp_Id := First_Elmt (Subp_List);
4412 Spec := Parent (Node (Subp_Id));
4414 while Present (Subp_Id) loop
4415 if Nkind (Parent (Spec))
4416 = N_Subprogram_Renaming_Declaration
4420 elsif Nkind (Spec) = N_Procedure_Specification
4421 and then Null_Present (Spec)
4426 Set_Body_Required (Library_Unit (N));
4430 Next_Elmt (Subp_Id);
4434 end Check_Declarations;
4436 -- Start of processing for Check_Body_Required
4439 -- If this is an imported package (Java and CIL usage) no body is
4440 -- needed. Scan list of pragmas that may follow a compilation unit
4441 -- to look for a relevant pragma Import.
4443 if Present (PA) then
4449 while Present (Prag) loop
4450 if Nkind (Prag) = N_Pragma
4451 and then Get_Pragma_Id (Prag) = Pragma_Import
4461 Check_Declarations (Specification (P_Unit));
4462 end Check_Body_Required;
4464 -----------------------------
4465 -- Has_Limited_With_Clause --
4466 -----------------------------
4468 function Has_Limited_With_Clause
4469 (C_Unit : Entity_Id;
4470 Pack : Entity_Id) return Boolean
4477 while Present (Par) loop
4478 if Ekind (Par) /= E_Package then
4482 -- Retrieve the Compilation_Unit node for Par and determine if
4483 -- its context clauses contain a limited with for Pack.
4485 Par_Unit := Parent (Parent (Parent (Par)));
4487 if Nkind (Par_Unit) = N_Package_Declaration then
4488 Par_Unit := Parent (Par_Unit);
4491 if Has_With_Clause (Par_Unit, Pack, True) then
4495 -- If there are more ancestors, climb up the tree, otherwise we
4498 if Is_Child_Unit (Par) then
4506 end Has_Limited_With_Clause;
4508 ----------------------------------
4509 -- Is_Visible_Through_Renamings --
4510 ----------------------------------
4512 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4513 Kind : constant Node_Kind :=
4514 Nkind (Unit (Cunit (Current_Sem_Unit)));
4520 -- Example of the error detected by this subprogram:
4528 -- package Ren_P renames P;
4534 -- limited with P; -- ERROR
4535 -- package R.C is ...
4537 Aux_Unit := Cunit (Current_Sem_Unit);
4540 Item := First (Context_Items (Aux_Unit));
4541 while Present (Item) loop
4542 if Nkind (Item) = N_With_Clause
4543 and then not Limited_Present (Item)
4544 and then Nkind (Unit (Library_Unit (Item))) =
4545 N_Package_Declaration
4548 First (Visible_Declarations
4549 (Specification (Unit (Library_Unit (Item)))));
4550 while Present (Decl) loop
4551 if Nkind (Decl) = N_Package_Renaming_Declaration
4552 and then Entity (Name (Decl)) = P
4554 -- Generate the error message only if the current unit
4555 -- is a package declaration; in case of subprogram
4556 -- bodies and package bodies we just return True to
4557 -- indicate that the limited view must not be
4560 if Kind = N_Package_Declaration then
4562 ("simultaneous visibility of the limited and " &
4563 "unlimited views not allowed", N);
4564 Error_Msg_Sloc := Sloc (Item);
4566 ("\\ unlimited view of & visible through the " &
4567 "context clause #", N, P);
4568 Error_Msg_Sloc := Sloc (Decl);
4569 Error_Msg_NE ("\\ and the renaming #", N, P);
4582 -- If it is a body not acting as spec, follow pointer to the
4583 -- corresponding spec, otherwise follow pointer to parent spec.
4585 if Present (Library_Unit (Aux_Unit))
4586 and then Nkind_In (Unit (Aux_Unit),
4587 N_Package_Body, N_Subprogram_Body)
4589 if Aux_Unit = Library_Unit (Aux_Unit) then
4591 -- Aux_Unit is a body that acts as a spec. Clause has
4592 -- already been flagged as illegal.
4597 Aux_Unit := Library_Unit (Aux_Unit);
4601 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4604 exit when No (Aux_Unit);
4608 end Is_Visible_Through_Renamings;
4610 -- Start of processing for Install_Limited_Withed_Unit
4613 pragma Assert (not Limited_View_Installed (N));
4615 -- In case of limited with_clause on subprograms, generics, instances,
4616 -- or renamings, the corresponding error was previously posted and we
4617 -- have nothing to do here. If the file is missing altogether, it has
4618 -- no source location.
4620 if Nkind (P_Unit) /= N_Package_Declaration
4621 or else Sloc (P_Unit) = No_Location
4626 P := Defining_Unit_Name (Specification (P_Unit));
4628 -- Handle child packages
4630 if Nkind (P) = N_Defining_Program_Unit_Name then
4631 Is_Child_Package := True;
4632 P := Defining_Identifier (P);
4635 -- Do not install the limited-view if the context of the unit is already
4636 -- available through a regular with clause.
4638 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4639 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4644 -- Do not install the limited-view if the full-view is already visible
4645 -- through renaming declarations.
4647 if Is_Visible_Through_Renamings (P) then
4651 -- Do not install the limited view if this is the unit being analyzed.
4652 -- This unusual case will happen when a unit has a limited_with clause
4653 -- on one of its children. The compilation of the child forces the load
4654 -- of the parent which tries to install the limited view of the child
4655 -- again. Installing the limited view must also be disabled when
4656 -- compiling the body of the child unit.
4658 if P = Cunit_Entity (Current_Sem_Unit)
4660 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4661 and then P = Main_Unit_Entity)
4666 -- This scenario is similar to the one above, the difference is that the
4667 -- compilation of sibling Par.Sib forces the load of parent Par which
4668 -- tries to install the limited view of Lim_Pack [1]. However Par.Sib
4669 -- has a with clause for Lim_Pack [2] in its body, and thus needs the
4670 -- non-limited views of all entities from Lim_Pack.
4672 -- limited with Lim_Pack; -- [1]
4673 -- package Par is ... package Lim_Pack is ...
4675 -- with Lim_Pack; -- [2]
4676 -- package Par.Sib is ... package body Par.Sib is ...
4678 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4679 -- Sem_Unit is the body of Par.Sib.
4681 if Ekind (P) = E_Package
4682 and then Ekind (Main_Unit_Entity) = E_Package
4683 and then Is_Child_Unit (Main_Unit_Entity)
4685 -- The body has a regular with clause
4687 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4688 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4690 -- One of the ancestors has a limited with clause
4692 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4693 N_Package_Specification
4694 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4699 -- A common use of the limited-with is to have a limited-with in the
4700 -- package spec, and a normal with in its package body. For example:
4702 -- limited with X; -- [1]
4706 -- package body A is ...
4708 -- The compilation of A's body installs the context clauses found at [2]
4709 -- and then the context clauses of its specification (found at [1]). As
4710 -- a consequence, at [1] the specification of X has been analyzed and it
4711 -- is immediately visible. According to the semantics of limited-with
4712 -- context clauses we don't install the limited view because the full
4713 -- view of X supersedes its limited view.
4715 if Analyzed (P_Unit)
4717 (Is_Immediately_Visible (P)
4718 or else (Is_Child_Package and then Is_Visible_Child_Unit (P)))
4721 -- The presence of both the limited and the analyzed nonlimited view
4722 -- may also be an error, such as an illegal context for a limited
4723 -- with_clause. In that case, do not process the context item at all.
4725 if Error_Posted (N) then
4729 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body then
4733 Item := First (Context_Items (Cunit (Current_Sem_Unit)));
4734 while Present (Item) loop
4735 if Nkind (Item) = N_With_Clause
4736 and then Comes_From_Source (Item)
4737 and then Entity (Name (Item)) = P
4746 -- If this is a child body, assume that the nonlimited with_clause
4747 -- appears in an ancestor. Could be refined ???
4751 (Unit (Library_Unit (Cunit (Current_Sem_Unit)))))
4758 -- If in package declaration, nonlimited view brought in from
4759 -- parent unit or some error condition.
4765 if Debug_Flag_I then
4766 Write_Str ("install limited view of ");
4767 Write_Name (Chars (P));
4771 -- If the unit has not been analyzed and the limited view has not been
4772 -- already installed then we install it.
4774 if not Analyzed (P_Unit) then
4775 if not In_Chain (P) then
4777 -- Minimum decoration
4779 Set_Ekind (P, E_Package);
4780 Set_Etype (P, Standard_Void_Type);
4781 Set_Scope (P, Standard_Standard);
4783 if Is_Child_Package then
4784 Set_Is_Child_Unit (P);
4785 Set_Is_Visible_Child_Unit (P);
4786 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4789 -- Place entity on visibility structure
4791 Set_Homonym (P, Current_Entity (P));
4792 Set_Current_Entity (P);
4794 if Debug_Flag_I then
4795 Write_Str (" (homonym) chain ");
4796 Write_Name (Chars (P));
4800 -- Install the incomplete view. The first element of the limited
4801 -- view is a header (an E_Package entity) used to reference the
4802 -- first shadow entity in the private part of the package.
4804 Lim_Header := Limited_View (P);
4805 Lim_Typ := First_Entity (Lim_Header);
4807 while Present (Lim_Typ)
4808 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4810 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4811 Set_Current_Entity (Lim_Typ);
4813 if Debug_Flag_I then
4814 Write_Str (" (homonym) chain ");
4815 Write_Name (Chars (Lim_Typ));
4819 Next_Entity (Lim_Typ);
4823 -- If the unit appears in a previous regular with_clause, the regular
4824 -- entities of the public part of the withed package must be replaced
4825 -- by the shadow ones.
4827 -- This code must be kept synchronized with the code that replaces the
4828 -- shadow entities by the real entities (see body of Remove_Limited
4829 -- With_Clause); otherwise the contents of the homonym chains are not
4833 -- Hide all the type entities of the public part of the package to
4834 -- avoid its usage. This is needed to cover all the subtype decla-
4835 -- rations because we do not remove them from the homonym chain.
4837 E := First_Entity (P);
4838 while Present (E) and then E /= First_Private_Entity (P) loop
4840 Set_Was_Hidden (E, Is_Hidden (E));
4847 -- Replace the real entities by the shadow entities of the limited
4848 -- view. The first element of the limited view is a header that is
4849 -- used to reference the first shadow entity in the private part
4850 -- of the package. Successive elements are the limited views of the
4851 -- type (including regular incomplete types) declared in the package.
4853 Lim_Header := Limited_View (P);
4855 Lim_Typ := First_Entity (Lim_Header);
4856 while Present (Lim_Typ)
4857 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4859 pragma Assert (not In_Chain (Lim_Typ));
4861 -- Do not unchain nested packages and child units
4863 if Ekind (Lim_Typ) /= E_Package
4864 and then not Is_Child_Unit (Lim_Typ)
4870 Prev := Current_Entity (Lim_Typ);
4873 -- Replace E in the homonyms list, so that the limited view
4874 -- becomes available.
4876 if E = Non_Limited_View (Lim_Typ) then
4877 Set_Homonym (Lim_Typ, Homonym (Prev));
4878 Set_Current_Entity (Lim_Typ);
4882 E := Homonym (Prev);
4884 -- E may have been removed when installing a previous
4885 -- limited_with_clause.
4889 exit when E = Non_Limited_View (Lim_Typ);
4891 Prev := Homonym (Prev);
4895 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4896 Set_Homonym (Prev, Lim_Typ);
4901 if Debug_Flag_I then
4902 Write_Str (" (homonym) chain ");
4903 Write_Name (Chars (Lim_Typ));
4908 Next_Entity (Lim_Typ);
4912 -- The package must be visible while the limited-with clause is active
4913 -- because references to the type P.T must resolve in the usual way.
4914 -- In addition, we remember that the limited-view has been installed to
4915 -- uninstall it at the point of context removal.
4917 Set_Is_Immediately_Visible (P);
4918 Set_Limited_View_Installed (N);
4920 -- If unit has not been analyzed in some previous context, check
4921 -- (imperfectly ???) whether it might need a body.
4923 if not Analyzed (P_Unit) then
4924 Check_Body_Required;
4927 -- If the package in the limited_with clause is a child unit, the clause
4928 -- is unanalyzed and appears as a selected component. Recast it as an
4929 -- expanded name so that the entity can be properly set. Use entity of
4930 -- parent, if available, for higher ancestors in the name.
4932 if Nkind (Name (N)) = N_Selected_Component then
4940 while Nkind (Nam) = N_Selected_Component
4941 and then Present (Ent)
4943 Change_Selected_Component_To_Expanded_Name (Nam);
4945 -- Set entity of parent identifiers if the unit is a child
4946 -- unit. This ensures that the tree is properly formed from
4947 -- semantic point of view (e.g. for ASIS queries).
4949 Set_Entity (Nam, Ent);
4951 Nam := Prefix (Nam);
4954 -- Set entity of last ancestor
4956 if Nkind (Nam) = N_Identifier then
4957 Set_Entity (Nam, Ent);
4963 Set_Entity (Name (N), P);
4964 Set_From_With_Type (P);
4965 end Install_Limited_Withed_Unit;
4967 -------------------------
4968 -- Install_Withed_Unit --
4969 -------------------------
4971 procedure Install_Withed_Unit
4972 (With_Clause : Node_Id;
4973 Private_With_OK : Boolean := False)
4975 Uname : constant Entity_Id := Entity (Name (With_Clause));
4976 P : constant Entity_Id := Scope (Uname);
4979 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4980 -- compiling a package declaration and the Private_With_OK flag was not
4981 -- set by the caller. These declarations will be installed later (before
4982 -- analyzing the private part of the package).
4984 if Private_Present (With_Clause)
4985 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
4986 and then not (Private_With_OK)
4991 if Debug_Flag_I then
4992 if Private_Present (With_Clause) then
4993 Write_Str ("install private withed unit ");
4995 Write_Str ("install withed unit ");
4998 Write_Name (Chars (Uname));
5002 -- We do not apply the restrictions to an internal unit unless we are
5003 -- compiling the internal unit as a main unit. This check is also
5004 -- skipped for dummy units (for missing packages).
5006 if Sloc (Uname) /= No_Location
5007 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
5008 or else Current_Sem_Unit = Main_Unit)
5010 Check_Restricted_Unit
5011 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
5014 if P /= Standard_Standard then
5016 -- If the unit is not analyzed after analysis of the with clause and
5017 -- it is an instantiation then it awaits a body and is the main unit.
5018 -- Its appearance in the context of some other unit indicates a
5019 -- circular dependency (DEC suite perversity).
5021 if not Analyzed (Uname)
5022 and then Nkind (Parent (Uname)) = N_Package_Instantiation
5025 ("instantiation depends on itself", Name (With_Clause));
5027 elsif not Is_Visible_Child_Unit (Uname) then
5028 Set_Is_Visible_Child_Unit (Uname);
5030 -- If the child unit appears in the context of its parent, it is
5031 -- immediately visible.
5033 if In_Open_Scopes (Scope (Uname)) then
5034 Set_Is_Immediately_Visible (Uname);
5037 if Is_Generic_Instance (Uname)
5038 and then Ekind (Uname) in Subprogram_Kind
5040 -- Set flag as well on the visible entity that denotes the
5041 -- instance, which renames the current one.
5043 Set_Is_Visible_Child_Unit
5045 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
5048 -- The parent unit may have been installed already, and may have
5049 -- appeared in a use clause.
5051 if In_Use (Scope (Uname)) then
5052 Set_Is_Potentially_Use_Visible (Uname);
5055 Set_Context_Installed (With_Clause);
5058 elsif not Is_Immediately_Visible (Uname) then
5059 if not Private_Present (With_Clause)
5060 or else Private_With_OK
5062 Set_Is_Immediately_Visible (Uname);
5065 Set_Context_Installed (With_Clause);
5068 -- A with-clause overrides a with-type clause: there are no restric-
5069 -- tions on the use of package entities.
5071 if Ekind (Uname) = E_Package then
5072 Set_From_With_Type (Uname, False);
5075 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
5076 -- unit if there is a visible homograph for it declared in the same
5077 -- declarative region. This pathological case can only arise when an
5078 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
5079 -- G1 has a generic child also named G2, and the context includes with_
5080 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
5081 -- of I1.G2 visible as well. If the child unit is named Standard, do
5082 -- not apply the check to the Standard package itself.
5084 if Is_Child_Unit (Uname)
5085 and then Is_Visible_Child_Unit (Uname)
5086 and then Ada_Version >= Ada_2005
5089 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
5095 U2 := Homonym (Uname);
5097 and then U2 /= Standard_Standard
5100 Decl2 := Unit_Declaration_Node (P2);
5102 if Is_Child_Unit (U2)
5103 and then Is_Visible_Child_Unit (U2)
5105 if Is_Generic_Instance (P)
5106 and then Nkind (Decl1) = N_Package_Declaration
5107 and then Generic_Parent (Specification (Decl1)) = P2
5109 Error_Msg_N ("illegal with_clause", With_Clause);
5111 ("\child unit has visible homograph" &
5112 " (RM 8.3(26), 10.1.1(19))",
5116 elsif Is_Generic_Instance (P2)
5117 and then Nkind (Decl2) = N_Package_Declaration
5118 and then Generic_Parent (Specification (Decl2)) = P
5120 -- With_clause for child unit of instance appears before
5121 -- in the context. We want to place the error message on
5122 -- it, not on the generic child unit itself.
5125 Prev_Clause : Node_Id;
5128 Prev_Clause := First (List_Containing (With_Clause));
5129 while Entity (Name (Prev_Clause)) /= U2 loop
5133 pragma Assert (Present (Prev_Clause));
5134 Error_Msg_N ("illegal with_clause", Prev_Clause);
5136 ("\child unit has visible homograph" &
5137 " (RM 8.3(26), 10.1.1(19))",
5148 end Install_Withed_Unit;
5154 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
5155 K : constant Node_Kind := Nkind (Lib_Unit);
5158 return (K in N_Generic_Declaration or else
5159 K in N_Generic_Instantiation or else
5160 K in N_Generic_Renaming_Declaration or else
5161 K = N_Package_Declaration or else
5162 K = N_Package_Renaming_Declaration or else
5163 K = N_Subprogram_Declaration or else
5164 K = N_Subprogram_Renaming_Declaration)
5165 and then Present (Parent_Spec (Lib_Unit));
5168 ------------------------------------
5169 -- Is_Legal_Shadow_Entity_In_Body --
5170 ------------------------------------
5172 function Is_Legal_Shadow_Entity_In_Body (T : Entity_Id) return Boolean is
5173 C_Unit : constant Node_Id := Cunit (Current_Sem_Unit);
5175 return Nkind (Unit (C_Unit)) = N_Package_Body
5178 (C_Unit, Cunit_Entity (Get_Source_Unit (Non_Limited_View (T))));
5179 end Is_Legal_Shadow_Entity_In_Body;
5181 -----------------------
5182 -- Load_Needed_Body --
5183 -----------------------
5185 -- N is a generic unit named in a with clause, or else it is a unit that
5186 -- contains a generic unit or an inlined function. In order to perform an
5187 -- instantiation, the body of the unit must be present. If the unit itself
5188 -- is generic, we assume that an instantiation follows, and load & analyze
5189 -- the body unconditionally. This forces analysis of the spec as well.
5191 -- If the unit is not generic, but contains a generic unit, it is loaded on
5192 -- demand, at the point of instantiation (see ch12).
5194 procedure Load_Needed_Body
5197 Do_Analyze : Boolean := True)
5199 Body_Name : Unit_Name_Type;
5200 Unum : Unit_Number_Type;
5202 Save_Style_Check : constant Boolean := Opt.Style_Check;
5203 -- The loading and analysis is done with style checks off
5206 if not GNAT_Mode then
5207 Style_Check := False;
5210 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
5213 (Load_Name => Body_Name,
5219 if Unum = No_Unit then
5223 Compiler_State := Analyzing; -- reset after load
5225 if not Fatal_Error (Unum) or else Try_Semantics then
5226 if Debug_Flag_L then
5227 Write_Str ("*** Loaded generic body");
5232 Semantics (Cunit (Unum));
5239 Style_Check := Save_Style_Check;
5240 end Load_Needed_Body;
5242 -------------------------
5243 -- Build_Limited_Views --
5244 -------------------------
5246 procedure Build_Limited_Views (N : Node_Id) is
5247 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
5248 P : constant Entity_Id := Cunit_Entity (Unum);
5250 Spec : Node_Id; -- To denote a package specification
5251 Lim_Typ : Entity_Id; -- To denote shadow entities
5252 Comp_Typ : Entity_Id; -- To denote real entities
5254 Lim_Header : Entity_Id; -- Package entity
5255 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
5256 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
5258 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id);
5259 -- Add attributes of an incomplete type to a shadow entity. The same
5260 -- attributes are placed on the real entity, so that gigi receives
5261 -- a consistent view.
5263 procedure Decorate_Package_Specification (P : Entity_Id);
5264 -- Add attributes of a package entity to the entity in a package
5267 procedure Decorate_Tagged_Type
5271 -- Set basic attributes of tagged type T, including its class_wide type.
5272 -- The parameters Loc, Scope are used to decorate the class_wide type.
5274 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id);
5275 -- Construct list of shadow entities and attach it to entity of
5276 -- package that is mentioned in a limited_with clause.
5278 function New_Internal_Shadow_Entity
5279 (Kind : Entity_Kind;
5280 Sloc_Value : Source_Ptr;
5281 Id_Char : Character) return Entity_Id;
5282 -- Build a new internal entity and append it to the list of shadow
5283 -- entities available through the limited-header
5289 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id) is
5290 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
5291 Is_Tagged : Boolean;
5296 while Present (Decl) loop
5298 -- For each library_package_declaration in the environment, there
5299 -- is an implicit declaration of a *limited view* of that library
5300 -- package. The limited view of a package contains:
5302 -- * For each nested package_declaration, a declaration of the
5303 -- limited view of that package, with the same defining-
5304 -- program-unit name.
5306 -- * For each type_declaration in the visible part, an incomplete
5307 -- type-declaration with the same defining_identifier, whose
5308 -- completion is the type_declaration. If the type_declaration
5309 -- is tagged, then the incomplete_type_declaration is tagged
5312 -- The partial view is tagged if the declaration has the
5313 -- explicit keyword, or else if it is a type extension, both
5314 -- of which can be ascertained syntactically.
5316 if Nkind (Decl) = N_Full_Type_Declaration then
5318 (Nkind (Type_Definition (Decl)) = N_Record_Definition
5319 and then Tagged_Present (Type_Definition (Decl)))
5321 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
5324 (Record_Extension_Part (Type_Definition (Decl))));
5326 Comp_Typ := Defining_Identifier (Decl);
5328 if not Analyzed_Unit then
5330 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5332 Decorate_Incomplete_Type (Comp_Typ, Scope);
5336 -- Create shadow entity for type
5339 New_Internal_Shadow_Entity
5340 (Kind => Ekind (Comp_Typ),
5341 Sloc_Value => Sloc (Comp_Typ),
5344 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5345 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5346 Set_From_With_Type (Lim_Typ);
5349 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5351 Decorate_Incomplete_Type (Lim_Typ, Scope);
5354 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5356 elsif Nkind_In (Decl, N_Private_Type_Declaration,
5357 N_Incomplete_Type_Declaration,
5358 N_Task_Type_Declaration,
5359 N_Protected_Type_Declaration)
5361 Comp_Typ := Defining_Identifier (Decl);
5364 Nkind_In (Decl, N_Private_Type_Declaration,
5365 N_Incomplete_Type_Declaration)
5366 and then Tagged_Present (Decl);
5368 if not Analyzed_Unit then
5370 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5372 Decorate_Incomplete_Type (Comp_Typ, Scope);
5377 New_Internal_Shadow_Entity
5378 (Kind => Ekind (Comp_Typ),
5379 Sloc_Value => Sloc (Comp_Typ),
5382 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5383 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5384 Set_From_With_Type (Lim_Typ);
5387 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5389 Decorate_Incomplete_Type (Lim_Typ, Scope);
5392 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5394 elsif Nkind (Decl) = N_Private_Extension_Declaration then
5395 Comp_Typ := Defining_Identifier (Decl);
5397 if not Analyzed_Unit then
5398 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5401 -- Create shadow entity for type
5404 New_Internal_Shadow_Entity
5405 (Kind => Ekind (Comp_Typ),
5406 Sloc_Value => Sloc (Comp_Typ),
5409 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5410 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5411 Set_From_With_Type (Lim_Typ);
5413 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5414 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5416 elsif Nkind (Decl) = N_Package_Declaration then
5421 Spec : constant Node_Id := Specification (Decl);
5424 Comp_Typ := Defining_Unit_Name (Spec);
5426 if not Analyzed (Cunit (Unum)) then
5427 Decorate_Package_Specification (Comp_Typ);
5428 Set_Scope (Comp_Typ, Scope);
5432 New_Internal_Shadow_Entity
5433 (Kind => Ekind (Comp_Typ),
5434 Sloc_Value => Sloc (Comp_Typ),
5437 Decorate_Package_Specification (Lim_Typ);
5438 Set_Scope (Lim_Typ, Scope);
5440 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5441 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5442 Set_From_With_Type (Lim_Typ);
5444 -- Note: The non_limited_view attribute is not used
5445 -- for local packages.
5449 First_Decl => First (Visible_Declarations (Spec)));
5457 ------------------------------
5458 -- Decorate_Incomplete_Type --
5459 ------------------------------
5461 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id) is
5463 Set_Ekind (E, E_Incomplete_Type);
5464 Set_Scope (E, Scop);
5466 Set_Is_First_Subtype (E, True);
5467 Set_Stored_Constraint (E, No_Elist);
5468 Set_Full_View (E, Empty);
5469 Init_Size_Align (E);
5470 end Decorate_Incomplete_Type;
5472 --------------------------
5473 -- Decorate_Tagged_Type --
5474 --------------------------
5476 procedure Decorate_Tagged_Type
5484 Decorate_Incomplete_Type (T, Scop);
5485 Set_Is_Tagged_Type (T);
5487 -- Build corresponding class_wide type, if not previously done
5489 -- Note: The class-wide entity is shared by the limited-view
5490 -- and the full-view.
5492 if No (Class_Wide_Type (T)) then
5493 CW := Make_Temporary (Loc, 'S');
5495 -- Set parent to be the same as the parent of the tagged type.
5496 -- We need a parent field set, and it is supposed to point to
5497 -- the declaration of the type. The tagged type declaration
5498 -- essentially declares two separate types, the tagged type
5499 -- itself and the corresponding class-wide type, so it is
5500 -- reasonable for the parent fields to point to the declaration
5503 Set_Parent (CW, Parent (T));
5505 -- Set remaining fields of classwide type
5507 Set_Ekind (CW, E_Class_Wide_Type);
5509 Set_Scope (CW, Scop);
5510 Set_Is_Tagged_Type (CW);
5511 Set_Is_First_Subtype (CW, True);
5512 Init_Size_Align (CW);
5513 Set_Has_Unknown_Discriminants (CW, True);
5514 Set_Class_Wide_Type (CW, CW);
5515 Set_Equivalent_Type (CW, Empty);
5516 Set_From_With_Type (CW, From_With_Type (T));
5518 -- Link type to its class-wide type
5520 Set_Class_Wide_Type (T, CW);
5522 end Decorate_Tagged_Type;
5524 ------------------------------------
5525 -- Decorate_Package_Specification --
5526 ------------------------------------
5528 procedure Decorate_Package_Specification (P : Entity_Id) is
5530 -- Place only the most basic attributes
5532 Set_Ekind (P, E_Package);
5533 Set_Etype (P, Standard_Void_Type);
5534 end Decorate_Package_Specification;
5536 --------------------------------
5537 -- New_Internal_Shadow_Entity --
5538 --------------------------------
5540 function New_Internal_Shadow_Entity
5541 (Kind : Entity_Kind;
5542 Sloc_Value : Source_Ptr;
5543 Id_Char : Character) return Entity_Id
5545 E : constant Entity_Id := Make_Temporary (Sloc_Value, Id_Char);
5548 Set_Ekind (E, Kind);
5549 Set_Is_Internal (E, True);
5551 if Kind in Type_Kind then
5552 Init_Size_Align (E);
5555 Append_Entity (E, Lim_Header);
5558 end New_Internal_Shadow_Entity;
5560 -- Start of processing for Build_Limited_Views
5563 pragma Assert (Limited_Present (N));
5565 -- A library_item mentioned in a limited_with_clause is a package
5566 -- declaration, not a subprogram declaration, generic declaration,
5567 -- generic instantiation, or package renaming declaration.
5569 case Nkind (Unit (Library_Unit (N))) is
5570 when N_Package_Declaration =>
5573 when N_Subprogram_Declaration =>
5574 Error_Msg_N ("subprograms not allowed in "
5575 & "limited with_clauses", N);
5578 when N_Generic_Package_Declaration |
5579 N_Generic_Subprogram_Declaration =>
5580 Error_Msg_N ("generics not allowed in "
5581 & "limited with_clauses", N);
5584 when N_Generic_Instantiation =>
5585 Error_Msg_N ("generic instantiations not allowed in "
5586 & "limited with_clauses", N);
5589 when N_Generic_Renaming_Declaration =>
5590 Error_Msg_N ("generic renamings not allowed in "
5591 & "limited with_clauses", N);
5594 when N_Subprogram_Renaming_Declaration =>
5595 Error_Msg_N ("renamed subprograms not allowed in "
5596 & "limited with_clauses", N);
5599 when N_Package_Renaming_Declaration =>
5600 Error_Msg_N ("renamed packages not allowed in "
5601 & "limited with_clauses", N);
5605 raise Program_Error;
5608 -- Check if the chain is already built
5610 Spec := Specification (Unit (Library_Unit (N)));
5612 if Limited_View_Installed (Spec) then
5616 Set_Ekind (P, E_Package);
5618 -- Build the header of the limited_view
5620 Lim_Header := Make_Temporary (Sloc (N), 'Z');
5621 Set_Ekind (Lim_Header, E_Package);
5622 Set_Is_Internal (Lim_Header);
5623 Set_Limited_View (P, Lim_Header);
5625 -- Create the auxiliary chain. All the shadow entities are appended to
5626 -- the list of entities of the limited-view header
5630 First_Decl => First (Visible_Declarations (Spec)));
5632 -- Save the last built shadow entity. It is needed later to set the
5633 -- reference to the first shadow entity in the private part
5635 Last_Pub_Lim_E := Last_Lim_E;
5637 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5638 -- Required to give support to limited-private-with clauses
5640 Build_Chain (Scope => P,
5641 First_Decl => First (Private_Declarations (Spec)));
5643 if Last_Pub_Lim_E /= Empty then
5644 Set_First_Private_Entity
5645 (Lim_Header, Next_Entity (Last_Pub_Lim_E));
5647 Set_First_Private_Entity
5648 (Lim_Header, First_Entity (P));
5651 Set_Limited_View_Installed (Spec);
5652 end Build_Limited_Views;
5654 -------------------------------
5655 -- Check_Body_Needed_For_SAL --
5656 -------------------------------
5658 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5660 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5661 -- Determine whether use of entity E might require the presence of its
5662 -- body. For a package this requires a recursive traversal of all nested
5665 ---------------------------
5666 -- Entity_Needed_For_SAL --
5667 ---------------------------
5669 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5673 if Is_Subprogram (E)
5674 and then Has_Pragma_Inline (E)
5678 elsif Ekind_In (E, E_Generic_Function, E_Generic_Procedure) then
5681 elsif Ekind (E) = E_Generic_Package
5683 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5684 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5688 elsif Ekind (E) = E_Package
5689 and then Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5690 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5692 Ent := First_Entity (E);
5693 while Present (Ent) loop
5694 if Entity_Needs_Body (Ent) then
5706 end Entity_Needs_Body;
5708 -- Start of processing for Check_Body_Needed_For_SAL
5711 if Ekind (Unit_Name) = E_Generic_Package
5712 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5713 N_Generic_Package_Declaration
5715 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5717 Set_Body_Needed_For_SAL (Unit_Name);
5719 elsif Ekind_In (Unit_Name, E_Generic_Procedure, E_Generic_Function) then
5720 Set_Body_Needed_For_SAL (Unit_Name);
5722 elsif Is_Subprogram (Unit_Name)
5723 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5724 N_Subprogram_Declaration
5725 and then Has_Pragma_Inline (Unit_Name)
5727 Set_Body_Needed_For_SAL (Unit_Name);
5729 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5730 Check_Body_Needed_For_SAL
5731 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5733 elsif Ekind (Unit_Name) = E_Package
5734 and then Entity_Needs_Body (Unit_Name)
5736 Set_Body_Needed_For_SAL (Unit_Name);
5738 elsif Ekind (Unit_Name) = E_Package_Body
5739 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5741 Check_Body_Needed_For_SAL
5742 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5744 end Check_Body_Needed_For_SAL;
5746 --------------------
5747 -- Remove_Context --
5748 --------------------
5750 procedure Remove_Context (N : Node_Id) is
5751 Lib_Unit : constant Node_Id := Unit (N);
5754 -- If this is a child unit, first remove the parent units
5756 if Is_Child_Spec (Lib_Unit) then
5757 Remove_Parents (Lib_Unit);
5760 Remove_Context_Clauses (N);
5763 ----------------------------
5764 -- Remove_Context_Clauses --
5765 ----------------------------
5767 procedure Remove_Context_Clauses (N : Node_Id) is
5769 Unit_Name : Entity_Id;
5772 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5773 -- limited-views first and regular-views later (to maintain the
5776 -- First Phase: Remove limited_with context clauses
5778 Item := First (Context_Items (N));
5779 while Present (Item) loop
5781 -- We are interested only in with clauses which got installed
5784 if Nkind (Item) = N_With_Clause
5785 and then Limited_Present (Item)
5786 and then Limited_View_Installed (Item)
5788 Remove_Limited_With_Clause (Item);
5794 -- Second Phase: Loop through context items and undo regular
5795 -- with_clauses and use_clauses.
5797 Item := First (Context_Items (N));
5798 while Present (Item) loop
5800 -- We are interested only in with clauses which got installed on
5801 -- entry, as indicated by their Context_Installed flag set
5803 if Nkind (Item) = N_With_Clause
5804 and then Limited_Present (Item)
5805 and then Limited_View_Installed (Item)
5809 elsif Nkind (Item) = N_With_Clause
5810 and then Context_Installed (Item)
5812 -- Remove items from one with'ed unit
5814 Unit_Name := Entity (Name (Item));
5815 Remove_Unit_From_Visibility (Unit_Name);
5816 Set_Context_Installed (Item, False);
5818 elsif Nkind (Item) = N_Use_Package_Clause then
5819 End_Use_Package (Item);
5821 elsif Nkind (Item) = N_Use_Type_Clause then
5822 End_Use_Type (Item);
5827 end Remove_Context_Clauses;
5829 --------------------------------
5830 -- Remove_Limited_With_Clause --
5831 --------------------------------
5833 procedure Remove_Limited_With_Clause (N : Node_Id) is
5834 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5837 Lim_Header : Entity_Id;
5838 Lim_Typ : Entity_Id;
5842 pragma Assert (Limited_View_Installed (N));
5844 -- In case of limited with_clause on subprograms, generics, instances,
5845 -- or renamings, the corresponding error was previously posted and we
5846 -- have nothing to do here.
5848 if Nkind (P_Unit) /= N_Package_Declaration then
5852 P := Defining_Unit_Name (Specification (P_Unit));
5854 -- Handle child packages
5856 if Nkind (P) = N_Defining_Program_Unit_Name then
5857 P := Defining_Identifier (P);
5860 if Debug_Flag_I then
5861 Write_Str ("remove limited view of ");
5862 Write_Name (Chars (P));
5863 Write_Str (" from visibility");
5867 -- Prepare the removal of the shadow entities from visibility. The first
5868 -- element of the limited view is a header (an E_Package entity) that is
5869 -- used to reference the first shadow entity in the private part of the
5872 Lim_Header := Limited_View (P);
5873 Lim_Typ := First_Entity (Lim_Header);
5875 -- Remove package and shadow entities from visibility if it has not
5878 if not Analyzed (P_Unit) then
5880 Set_Is_Immediately_Visible (P, False);
5882 while Present (Lim_Typ) loop
5884 Next_Entity (Lim_Typ);
5887 -- Otherwise this package has already appeared in the closure and its
5888 -- shadow entities must be replaced by its real entities. This code
5889 -- must be kept synchronized with the complementary code in Install
5890 -- Limited_Withed_Unit.
5893 -- Real entities that are type or subtype declarations were hidden
5894 -- from visibility at the point of installation of the limited-view.
5895 -- Now we recover the previous value of the hidden attribute.
5897 E := First_Entity (P);
5898 while Present (E) and then E /= First_Private_Entity (P) loop
5900 Set_Is_Hidden (E, Was_Hidden (E));
5906 while Present (Lim_Typ)
5907 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5909 -- Nested packages and child units were not unchained
5911 if Ekind (Lim_Typ) /= E_Package
5912 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5914 -- If the package has incomplete types, the limited view of the
5915 -- incomplete type is in fact never visible (AI05-129) but we
5916 -- have created a shadow entity E1 for it, that points to E2,
5917 -- a non-limited incomplete type. This in turn has a full view
5918 -- E3 that is the full declaration. There is a corresponding
5919 -- shadow entity E4. When reinstalling the non-limited view,
5920 -- E2 must become the current entity and E3 must be ignored.
5922 E := Non_Limited_View (Lim_Typ);
5924 if Present (Current_Entity (E))
5925 and then Ekind (Current_Entity (E)) = E_Incomplete_Type
5926 and then Full_View (Current_Entity (E)) = E
5929 -- Lim_Typ is the limited view of a full type declaration
5930 -- that has a previous incomplete declaration, i.e. E3 from
5931 -- the previous description. Nothing to insert.
5936 pragma Assert (not In_Chain (E));
5938 Prev := Current_Entity (Lim_Typ);
5940 if Prev = Lim_Typ then
5941 Set_Current_Entity (E);
5944 while Present (Prev)
5945 and then Homonym (Prev) /= Lim_Typ
5947 Prev := Homonym (Prev);
5950 if Present (Prev) then
5951 Set_Homonym (Prev, E);
5955 -- Preserve structure of homonym chain
5957 Set_Homonym (E, Homonym (Lim_Typ));
5961 Next_Entity (Lim_Typ);
5965 -- Indicate that the limited view of the package is not installed
5967 Set_From_With_Type (P, False);
5968 Set_Limited_View_Installed (N, False);
5969 end Remove_Limited_With_Clause;
5971 --------------------
5972 -- Remove_Parents --
5973 --------------------
5975 procedure Remove_Parents (Lib_Unit : Node_Id) is
5978 P_Spec : Node_Id := Empty;
5980 Vis : constant Boolean :=
5981 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
5984 if Is_Child_Spec (Lib_Unit) then
5985 P_Spec := Parent_Spec (Lib_Unit);
5987 elsif Nkind (Lib_Unit) = N_Package_Body
5988 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
5990 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
5993 if Present (P_Spec) then
5995 P_Name := Get_Parent_Entity (P);
5996 Remove_Context_Clauses (P_Spec);
5997 End_Package_Scope (P_Name);
5998 Set_Is_Immediately_Visible (P_Name, Vis);
6000 -- Remove from visibility the siblings as well, which are directly
6001 -- visible while the parent is in scope.
6003 E := First_Entity (P_Name);
6004 while Present (E) loop
6005 if Is_Child_Unit (E) then
6006 Set_Is_Immediately_Visible (E, False);
6012 Set_In_Package_Body (P_Name, False);
6014 -- This is the recursive call to remove the context of any higher
6015 -- level parent. This recursion ensures that all parents are removed
6016 -- in the reverse order of their installation.
6022 ---------------------------------
6023 -- Remove_Private_With_Clauses --
6024 ---------------------------------
6026 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
6029 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
6030 -- Check whether a given unit appears in a regular with_clause. Used to
6031 -- determine whether a private_with_clause, implicit or explicit, should
6034 ----------------------------
6035 -- In_Regular_With_Clause --
6036 ----------------------------
6038 function In_Regular_With_Clause (E : Entity_Id) return Boolean
6043 Item := First (Context_Items (Comp_Unit));
6044 while Present (Item) loop
6045 if Nkind (Item) = N_With_Clause
6046 and then Entity (Name (Item)) = E
6047 and then not Private_Present (Item)
6055 end In_Regular_With_Clause;
6057 -- Start of processing for Remove_Private_With_Clauses
6060 Item := First (Context_Items (Comp_Unit));
6061 while Present (Item) loop
6062 if Nkind (Item) = N_With_Clause
6063 and then Private_Present (Item)
6065 -- If private_with_clause is redundant, remove it from context,
6066 -- as a small optimization to subsequent handling of private_with
6067 -- clauses in other nested packages.
6069 if In_Regular_With_Clause (Entity (Name (Item))) then
6071 Nxt : constant Node_Id := Next (Item);
6077 elsif Limited_Present (Item) then
6078 if not Limited_View_Installed (Item) then
6079 Remove_Limited_With_Clause (Item);
6085 Remove_Unit_From_Visibility (Entity (Name (Item)));
6086 Set_Context_Installed (Item, False);
6094 end Remove_Private_With_Clauses;
6096 ---------------------------------
6097 -- Remove_Unit_From_Visibility --
6098 ---------------------------------
6100 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
6101 P : constant Entity_Id := Scope (Unit_Name);
6104 if Debug_Flag_I then
6105 Write_Str ("remove unit ");
6106 Write_Name (Chars (Unit_Name));
6107 Write_Str (" from visibility");
6111 if P /= Standard_Standard then
6112 Set_Is_Visible_Child_Unit (Unit_Name, False);
6115 Set_Is_Potentially_Use_Visible (Unit_Name, False);
6116 Set_Is_Immediately_Visible (Unit_Name, False);
6117 end Remove_Unit_From_Visibility;
6132 procedure Unchain (E : Entity_Id) is
6136 Prev := Current_Entity (E);
6142 Set_Name_Entity_Id (Chars (E), Homonym (E));
6145 while Present (Prev)
6146 and then Homonym (Prev) /= E
6148 Prev := Homonym (Prev);
6151 if Present (Prev) then
6152 Set_Homonym (Prev, Homonym (E));
6156 if Debug_Flag_I then
6157 Write_Str (" (homonym) unchain ");
6158 Write_Name (Chars (E));
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