1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2011, 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 mostly for error checking and consistency
759 -- purposes (but not only, e.g. there could be a contract on the spec),
760 -- so there's nothing else to be done.
762 elsif Nkind (Unit_Node) = N_Subprogram_Body then
763 if Acts_As_Spec (N) then
765 -- If the subprogram body is a child unit, we must create a
766 -- declaration for it, in order to properly load the parent(s).
767 -- After this, the original unit does not acts as a spec, because
768 -- there is an explicit one. If this unit appears in a context
769 -- clause, then an implicit with on the parent will be added when
770 -- installing the context. If this is the main unit, there is no
771 -- Unit_Table entry for the declaration (it has the unit number
772 -- of the main unit) and code generation is unaffected.
774 Unum := Get_Cunit_Unit_Number (N);
775 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
777 if Par_Spec_Name /= No_Unit_Name then
780 (Load_Name => Par_Spec_Name,
785 if Unum /= No_Unit then
787 -- Build subprogram declaration and attach parent unit to it
788 -- This subprogram declaration does not come from source,
789 -- Nevertheless the backend must generate debugging info for
790 -- it, and this must be indicated explicitly. We also mark
791 -- the body entity as a child unit now, to prevent a
792 -- cascaded error if the spec entity cannot be entered
793 -- in its scope. Finally we create a Units table entry for
794 -- the subprogram declaration, to maintain a one-to-one
795 -- correspondence with compilation unit nodes. This is
796 -- critical for the tree traversals performed by CodePeer.
799 Loc : constant Source_Ptr := Sloc (N);
800 SCS : constant Boolean :=
801 Get_Comes_From_Source_Default;
804 Set_Comes_From_Source_Default (False);
806 Make_Compilation_Unit (Loc,
807 Context_Items => New_Copy_List (Context_Items (N)),
809 Make_Subprogram_Declaration (Sloc (N),
812 (Specification (Unit_Node))),
814 Make_Compilation_Unit_Aux (Loc));
816 Set_Library_Unit (N, Lib_Unit);
817 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
818 Make_Child_Decl_Unit (N);
819 Semantics (Lib_Unit);
821 -- Now that a separate declaration exists, the body
822 -- of the child unit does not act as spec any longer.
824 Set_Acts_As_Spec (N, False);
825 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
826 Set_Debug_Info_Needed (Defining_Entity (Unit (Lib_Unit)));
827 Set_Comes_From_Source_Default (SCS);
832 -- Here for subprogram with separate declaration
835 Semantics (Lib_Unit);
836 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
837 Version_Update (N, Lib_Unit);
840 -- If this is a child unit, generate references to the parents
842 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
843 N_Defining_Program_Unit_Name
845 Generate_Parent_References (
846 Specification (Unit_Node),
847 Scope (Defining_Entity (Unit (Lib_Unit))));
851 -- If it is a child unit, the parent must be elaborated first and we
852 -- update version, since we are dependent on our parent.
854 if Is_Child_Spec (Unit_Node) then
856 -- The analysis of the parent is done with style checks off
859 Save_Style_Check : constant Boolean := Style_Check;
860 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
861 Cunit_Boolean_Restrictions_Save;
864 if not GNAT_Mode then
865 Style_Check := False;
868 Semantics (Parent_Spec (Unit_Node));
869 Version_Update (N, Parent_Spec (Unit_Node));
870 Style_Check := Save_Style_Check;
871 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
875 -- With the analysis done, install the context. Note that we can't
876 -- install the context from the with clauses as we analyze them, because
877 -- each with clause must be analyzed in a clean visibility context, so
878 -- we have to wait and install them all at once.
882 if Is_Child_Spec (Unit_Node) then
884 -- Set the entities of all parents in the program_unit_name
886 Generate_Parent_References (
887 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
890 -- All components of the context: with-clauses, library unit, ancestors
891 -- if any, (and their context) are analyzed and installed.
893 -- Call special debug routine sm if this is the main unit
895 if Current_Sem_Unit = Main_Unit then
899 -- Now analyze the unit (package, subprogram spec, body) itself
903 if Warn_On_Redundant_Constructs then
904 Check_Redundant_Withs (Context_Items (N));
906 if Nkind (Unit_Node) = N_Package_Body then
907 Check_Redundant_Withs
908 (Context_Items => Context_Items (N),
909 Spec_Context_Items => Context_Items (Lib_Unit));
913 -- The above call might have made Unit_Node an N_Subprogram_Body from
914 -- something else, so propagate any Acts_As_Spec flag.
916 if Nkind (Unit_Node) = N_Subprogram_Body
917 and then Acts_As_Spec (Unit_Node)
919 Set_Acts_As_Spec (N);
922 -- Register predefined units in Rtsfind
925 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
927 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
928 Set_RTU_Loaded (Unit_Node);
932 -- Treat compilation unit pragmas that appear after the library unit
934 if Present (Pragmas_After (Aux_Decls_Node (N))) then
936 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
938 while Present (Prag_Node) loop
945 -- Generate distribution stubs if requested and no error
948 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
950 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
951 and then not Fatal_Error (Main_Unit)
953 if Is_RCI_Pkg_Spec_Or_Body (N) then
955 -- Regular RCI package
957 Add_Stub_Constructs (N);
959 elsif (Nkind (Unit_Node) = N_Package_Declaration
960 and then Is_Shared_Passive (Defining_Entity
961 (Specification (Unit_Node))))
962 or else (Nkind (Unit_Node) = N_Package_Body
964 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
966 -- Shared passive package
968 Add_Stub_Constructs (N);
970 elsif Nkind (Unit_Node) = N_Package_Instantiation
972 Is_Remote_Call_Interface
973 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
975 -- Instantiation of a RCI generic package
977 Add_Stub_Constructs (N);
981 -- Remove unit from visibility, so that environment is clean for the
982 -- next compilation, which is either the main unit or some other unit
985 if Nkind_In (Unit_Node, N_Package_Declaration,
986 N_Package_Renaming_Declaration,
987 N_Subprogram_Declaration)
988 or else Nkind (Unit_Node) in N_Generic_Declaration
990 (Nkind (Unit_Node) = N_Subprogram_Body
991 and then Acts_As_Spec (Unit_Node))
993 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
995 -- If the unit is an instantiation whose body will be elaborated for
996 -- inlining purposes, use the proper entity of the instance. The entity
997 -- may be missing if the instantiation was illegal.
999 elsif Nkind (Unit_Node) = N_Package_Instantiation
1000 and then not Error_Posted (Unit_Node)
1001 and then Present (Instance_Spec (Unit_Node))
1003 Remove_Unit_From_Visibility
1004 (Defining_Entity (Instance_Spec (Unit_Node)));
1006 elsif Nkind (Unit_Node) = N_Package_Body
1007 or else (Nkind (Unit_Node) = N_Subprogram_Body
1008 and then not Acts_As_Spec (Unit_Node))
1010 -- Bodies that are not the main unit are compiled if they are generic
1011 -- or contain generic or inlined units. Their analysis brings in the
1012 -- context of the corresponding spec (unit declaration) which must be
1013 -- removed as well, to return the compilation environment to its
1016 Remove_Context (Lib_Unit);
1017 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
1020 -- Last step is to deinstall the context we just installed as well as
1021 -- the unit just compiled.
1025 -- If this is the main unit and we are generating code, we must check
1026 -- that all generic units in the context have a body if they need it,
1027 -- even if they have not been instantiated. In the absence of .ali files
1028 -- for generic units, we must force the load of the body, just to
1029 -- produce the proper error if the body is absent. We skip this
1030 -- verification if the main unit itself is generic.
1032 if Get_Cunit_Unit_Number (N) = Main_Unit
1033 and then Operating_Mode = Generate_Code
1034 and then Expander_Active
1036 -- Check whether the source for the body of the unit must be included
1037 -- in a standalone library.
1039 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
1041 -- Indicate that the main unit is now analyzed, to catch possible
1042 -- circularities between it and generic bodies. Remove main unit from
1043 -- visibility. This might seem superfluous, but the main unit must
1044 -- not be visible in the generic body expansions that follow.
1046 Set_Analyzed (N, True);
1047 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
1052 Un : Unit_Number_Type;
1054 Save_Style_Check : constant Boolean := Style_Check;
1055 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
1056 Cunit_Boolean_Restrictions_Save;
1059 Item := First (Context_Items (N));
1060 while Present (Item) loop
1062 -- Check for explicit with clause
1064 if Nkind (Item) = N_With_Clause
1065 and then not Implicit_With (Item)
1067 -- Ada 2005 (AI-50217): Ignore limited-withed units
1069 and then not Limited_Present (Item)
1071 Nam := Entity (Name (Item));
1073 -- Compile generic subprogram, unless it is intrinsic or
1074 -- imported so no body is required, or generic package body
1075 -- if the package spec requires a body.
1077 if (Is_Generic_Subprogram (Nam)
1078 and then not Is_Intrinsic_Subprogram (Nam)
1079 and then not Is_Imported (Nam))
1080 or else (Ekind (Nam) = E_Generic_Package
1081 and then Unit_Requires_Body (Nam))
1083 Style_Check := False;
1085 if Present (Renamed_Object (Nam)) then
1088 (Load_Name => Get_Body_Name
1090 (Unit_Declaration_Node
1091 (Renamed_Object (Nam)))),
1099 (Load_Name => Get_Body_Name
1100 (Get_Unit_Name (Item)),
1107 if Un = No_Unit then
1109 ("body of generic unit& not found", Item, Nam);
1112 elsif not Analyzed (Cunit (Un))
1113 and then Un /= Main_Unit
1114 and then not Fatal_Error (Un)
1116 Style_Check := False;
1117 Semantics (Cunit (Un));
1125 Style_Check := Save_Style_Check;
1126 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1130 -- Deal with creating elaboration Boolean if needed. We create an
1131 -- elaboration boolean only for units that come from source since
1132 -- units manufactured by the compiler never need elab checks.
1134 if Comes_From_Source (N)
1135 and then Nkind_In (Unit_Node, N_Package_Declaration,
1136 N_Generic_Package_Declaration,
1137 N_Subprogram_Declaration,
1138 N_Generic_Subprogram_Declaration)
1141 Loc : constant Source_Ptr := Sloc (N);
1142 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1145 Spec_Id := Defining_Entity (Unit_Node);
1146 Generate_Definition (Spec_Id);
1148 -- See if an elaboration entity is required for possible access
1149 -- before elaboration checking. Note that we must allow for this
1150 -- even if -gnatE is not set, since a client may be compiled in
1151 -- -gnatE mode and reference the entity.
1153 -- These entities are also used by the binder to prevent multiple
1154 -- attempts to execute the elaboration code for the library case
1155 -- where the elaboration routine might otherwise be called more
1158 -- Case of units which do not require elaboration checks
1161 -- Pure units do not need checks
1165 -- Preelaborated units do not need checks
1167 or else Is_Preelaborated (Spec_Id)
1169 -- No checks needed if pragma Elaborate_Body present
1171 or else Has_Pragma_Elaborate_Body (Spec_Id)
1173 -- No checks needed if unit does not require a body
1175 or else not Unit_Requires_Body (Spec_Id)
1177 -- No checks needed for predefined files
1179 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1181 -- No checks required if no separate spec
1183 or else Acts_As_Spec (N)
1185 -- This is a case where we only need the entity for
1186 -- checking to prevent multiple elaboration checks.
1188 Set_Elaboration_Entity_Required (Spec_Id, False);
1190 -- Case of elaboration entity is required for access before
1191 -- elaboration checking (so certainly we must build it!)
1194 Set_Elaboration_Entity_Required (Spec_Id, True);
1197 Build_Elaboration_Entity (N, Spec_Id);
1201 -- Freeze the compilation unit entity. This for sure is needed because
1202 -- of some warnings that can be output (see Freeze_Subprogram), but may
1203 -- in general be required. If freezing actions result, place them in the
1204 -- compilation unit actions list, and analyze them.
1207 L : constant List_Id :=
1208 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), N);
1210 while Is_Non_Empty_List (L) loop
1211 Insert_Library_Level_Action (Remove_Head (L));
1217 if Nkind (Unit_Node) = N_Package_Declaration
1218 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1219 and then Expander_Active
1222 Save_Style_Check : constant Boolean := Style_Check;
1223 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1224 Options : Style_Check_Options;
1227 Save_Style_Check_Options (Options);
1228 Reset_Style_Check_Options;
1229 Opt.Warning_Mode := Suppress;
1230 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1232 Reset_Style_Check_Options;
1233 Set_Style_Check_Options (Options);
1234 Style_Check := Save_Style_Check;
1235 Warning_Mode := Save_Warning;
1239 -- If we are generating obsolescent warnings, then here is where we
1240 -- generate them for the with'ed items. The reason for this special
1241 -- processing is that the normal mechanism of generating the warnings
1242 -- for referenced entities does not work for context clause references.
1243 -- That's because when we first analyze the context, it is too early to
1244 -- know if the with'ing unit is itself obsolescent (which suppresses
1247 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1249 -- Push current compilation unit as scope, so that the test for
1250 -- being within an obsolescent unit will work correctly.
1252 Push_Scope (Defining_Entity (Unit_Node));
1254 -- Loop through context items to deal with with clauses
1262 Item := First (Context_Items (N));
1263 while Present (Item) loop
1264 if Nkind (Item) = N_With_Clause
1266 -- Suppress this check in limited-withed units. Further work
1267 -- needed here if we decide to incorporate this check on
1268 -- limited-withed units.
1270 and then not Limited_Present (Item)
1273 Ent := Entity (Nam);
1275 if Is_Obsolescent (Ent) then
1276 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1284 -- Remove temporary install of current unit as scope
1288 end Analyze_Compilation_Unit;
1290 ---------------------
1291 -- Analyze_Context --
1292 ---------------------
1294 procedure Analyze_Context (N : Node_Id) is
1295 Ukind : constant Node_Kind := Nkind (Unit (N));
1299 -- First process all configuration pragmas at the start of the context
1300 -- items. Strictly these are not part of the context clause, but that
1301 -- is where the parser puts them. In any case for sure we must analyze
1302 -- these before analyzing the actual context items, since they can have
1303 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1304 -- be with'ed as a result of changing categorizations in Ada 2005).
1306 Item := First (Context_Items (N));
1307 while Present (Item)
1308 and then Nkind (Item) = N_Pragma
1309 and then Pragma_Name (Item) in Configuration_Pragma_Names
1315 -- This is the point at which we capture the configuration settings
1316 -- for the unit. At the moment only the Optimize_Alignment setting
1317 -- needs to be captured. Probably more later ???
1319 if Optimize_Alignment_Local then
1320 Set_OA_Setting (Current_Sem_Unit, 'L');
1322 Set_OA_Setting (Current_Sem_Unit, Optimize_Alignment);
1325 -- Loop through actual context items. This is done in two passes:
1327 -- a) The first pass analyzes non-limited with-clauses and also any
1328 -- configuration pragmas (we need to get the latter analyzed right
1329 -- away, since they can affect processing of subsequent items.
1331 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1333 while Present (Item) loop
1335 -- For with clause, analyze the with clause, and then update the
1336 -- version, since we are dependent on a unit that we with.
1338 if Nkind (Item) = N_With_Clause
1339 and then not Limited_Present (Item)
1341 -- Skip analyzing with clause if no unit, nothing to do (this
1342 -- happens for a with that references a non-existent unit). Skip
1343 -- as well if this is a with_clause for the main unit, which
1344 -- happens if a subunit has a useless with_clause on its parent.
1346 if Present (Library_Unit (Item)) then
1347 if Library_Unit (Item) /= Cunit (Current_Sem_Unit) then
1351 Set_Entity (Name (Item), Cunit_Entity (Current_Sem_Unit));
1355 if not Implicit_With (Item) then
1356 Version_Update (N, Library_Unit (Item));
1359 -- Skip pragmas. Configuration pragmas at the start were handled in
1360 -- the loop above, and remaining pragmas are not processed until we
1361 -- actually install the context (see Install_Context). We delay the
1362 -- analysis of these pragmas to make sure that we have installed all
1363 -- the implicit with's on parent units.
1365 -- Skip use clauses at this stage, since we don't want to do any
1366 -- installing of potentially use-visible entities until we
1367 -- actually install the complete context (in Install_Context).
1368 -- Otherwise things can get installed in the wrong context.
1377 -- Second pass: examine all limited_with clauses. All other context
1378 -- items are ignored in this pass.
1380 Item := First (Context_Items (N));
1381 while Present (Item) loop
1382 if Nkind (Item) = N_With_Clause
1383 and then Limited_Present (Item)
1385 -- No need to check errors on implicitly generated limited-with
1388 if not Implicit_With (Item) then
1390 -- Verify that the illegal contexts given in 10.1.2 (18/2) are
1391 -- properly rejected, including renaming declarations.
1393 if not Nkind_In (Ukind, N_Package_Declaration,
1394 N_Subprogram_Declaration)
1395 and then Ukind not in N_Generic_Declaration
1396 and then Ukind not in N_Generic_Instantiation
1398 Error_Msg_N ("limited with_clause not allowed here", Item);
1400 -- Check wrong use of a limited with clause applied to the
1401 -- compilation unit containing the limited-with clause.
1403 -- limited with P.Q;
1404 -- package P.Q is ...
1406 elsif Unit (Library_Unit (Item)) = Unit (N) then
1407 Error_Msg_N ("wrong use of limited-with clause", Item);
1409 -- Check wrong use of limited-with clause applied to some
1410 -- immediate ancestor.
1412 elsif Is_Child_Spec (Unit (N)) then
1414 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1418 P := Parent_Spec (Unit (N));
1420 if Unit (P) = Lib_U then
1421 Error_Msg_N ("limited with_clause cannot "
1422 & "name ancestor", Item);
1426 exit when not Is_Child_Spec (Unit (P));
1427 P := Parent_Spec (Unit (P));
1432 -- Check if the limited-withed unit is already visible through
1433 -- some context clause of the current compilation unit or some
1434 -- ancestor of the current compilation unit.
1437 Lim_Unit_Name : constant Node_Id := Name (Item);
1438 Comp_Unit : Node_Id;
1440 Unit_Name : Node_Id;
1445 It := First (Context_Items (Comp_Unit));
1446 while Present (It) loop
1448 and then Nkind (It) = N_With_Clause
1449 and then not Limited_Present (It)
1451 Nkind_In (Unit (Library_Unit (It)),
1452 N_Package_Declaration,
1453 N_Package_Renaming_Declaration)
1455 if Nkind (Unit (Library_Unit (It))) =
1456 N_Package_Declaration
1458 Unit_Name := Name (It);
1460 Unit_Name := Name (Unit (Library_Unit (It)));
1463 -- Check if the named package (or some ancestor)
1464 -- leaves visible the full-view of the unit given
1465 -- in the limited-with clause
1468 if Designate_Same_Unit (Lim_Unit_Name,
1471 Error_Msg_Sloc := Sloc (It);
1473 ("simultaneous visibility of limited "
1474 & "and unlimited views not allowed",
1477 ("\unlimited view visible through "
1478 & "context clause #",
1482 elsif Nkind (Unit_Name) = N_Identifier then
1486 Unit_Name := Prefix (Unit_Name);
1493 exit when not Is_Child_Spec (Unit (Comp_Unit));
1495 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1500 -- Skip analyzing with clause if no unit, see above
1502 if Present (Library_Unit (Item)) then
1506 -- A limited_with does not impose an elaboration order, but
1507 -- there is a semantic dependency for recompilation purposes.
1509 if not Implicit_With (Item) then
1510 Version_Update (N, Library_Unit (Item));
1513 -- Pragmas and use clauses and with clauses other than limited
1514 -- with's are ignored in this pass through the context items.
1522 end Analyze_Context;
1524 -------------------------------
1525 -- Analyze_Package_Body_Stub --
1526 -------------------------------
1528 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1529 Id : constant Entity_Id := Defining_Identifier (N);
1533 -- The package declaration must be in the current declarative part
1535 Check_Stub_Level (N);
1536 Nam := Current_Entity_In_Scope (Id);
1538 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1539 Error_Msg_N ("missing specification for package stub", N);
1541 elsif Has_Completion (Nam)
1542 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1544 Error_Msg_N ("duplicate or redundant stub for package", N);
1547 -- Indicate that the body of the package exists. If we are doing
1548 -- only semantic analysis, the stub stands for the body. If we are
1549 -- generating code, the existence of the body will be confirmed
1550 -- when we load the proper body.
1552 Set_Has_Completion (Nam);
1553 Set_Scope (Defining_Entity (N), Current_Scope);
1554 Generate_Reference (Nam, Id, 'b');
1555 Analyze_Proper_Body (N, Nam);
1557 end Analyze_Package_Body_Stub;
1559 -------------------------
1560 -- Analyze_Proper_Body --
1561 -------------------------
1563 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1564 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1565 Unum : Unit_Number_Type;
1567 procedure Optional_Subunit;
1568 -- This procedure is called when the main unit is a stub, or when we
1569 -- are not generating code. In such a case, we analyze the subunit if
1570 -- present, which is user-friendly and in fact required for ASIS, but
1571 -- we don't complain if the subunit is missing.
1573 ----------------------
1574 -- Optional_Subunit --
1575 ----------------------
1577 procedure Optional_Subunit is
1578 Comp_Unit : Node_Id;
1581 -- Try to load subunit, but ignore any errors that occur during the
1582 -- loading of the subunit, by using the special feature in Errout to
1583 -- ignore all errors. Note that Fatal_Error will still be set, so we
1584 -- will be able to check for this case below.
1586 if not ASIS_Mode then
1587 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1592 (Load_Name => Subunit_Name,
1597 if not ASIS_Mode then
1598 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1601 -- All done if we successfully loaded the subunit
1604 and then (not Fatal_Error (Unum) or else Try_Semantics)
1606 Comp_Unit := Cunit (Unum);
1608 -- If the file was empty or seriously mangled, the unit itself may
1611 if No (Unit (Comp_Unit)) then
1613 ("subunit does not contain expected proper body", N);
1615 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1617 ("expected SEPARATE subunit, found child unit",
1618 Cunit_Entity (Unum));
1620 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1621 Analyze_Subunit (Comp_Unit);
1622 Set_Library_Unit (N, Comp_Unit);
1625 elsif Unum = No_Unit
1626 and then Present (Nam)
1628 if Is_Protected_Type (Nam) then
1629 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1631 Set_Corresponding_Body (
1632 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1635 end Optional_Subunit;
1637 -- Start of processing for Analyze_Proper_Body
1640 -- If the subunit is already loaded, it means that the main unit is a
1641 -- subunit, and that the current unit is one of its parents which was
1642 -- being analyzed to provide the needed context for the analysis of the
1643 -- subunit. In this case we analyze the subunit and continue with the
1644 -- parent, without looking a subsequent subunits.
1646 if Is_Loaded (Subunit_Name) then
1648 -- If the proper body is already linked to the stub node, the stub is
1649 -- in a generic unit and just needs analyzing.
1651 if Present (Library_Unit (N)) then
1652 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1653 Analyze_Subunit (Library_Unit (N));
1655 -- Otherwise we must load the subunit and link to it
1658 -- Load the subunit, this must work, since we originally loaded
1659 -- the subunit earlier on. So this will not really load it, just
1660 -- give access to it.
1664 (Load_Name => Subunit_Name,
1669 -- And analyze the subunit in the parent context (note that we
1670 -- do not call Semantics, since that would remove the parent
1671 -- context). Because of this, we have to manually reset the
1672 -- compiler state to Analyzing since it got destroyed by Load.
1674 if Unum /= No_Unit then
1675 Compiler_State := Analyzing;
1677 -- Check that the proper body is a subunit and not a child
1678 -- unit. If the unit was previously loaded, the error will
1679 -- have been emitted when copying the generic node, so we
1680 -- just return to avoid cascaded errors.
1682 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1686 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1687 Analyze_Subunit (Cunit (Unum));
1688 Set_Library_Unit (N, Cunit (Unum));
1692 -- If the main unit is a subunit, then we are just performing semantic
1693 -- analysis on that subunit, and any other subunits of any parent unit
1694 -- should be ignored, except that if we are building trees for ASIS
1695 -- usage we want to annotate the stub properly.
1697 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1698 and then Subunit_Name /= Unit_Name (Main_Unit)
1704 -- But before we return, set the flag for unloaded subunits. This
1705 -- will suppress junk warnings of variables in the same declarative
1706 -- part (or a higher level one) that are in danger of looking unused
1707 -- when in fact there might be a declaration in the subunit that we
1708 -- do not intend to load.
1710 Unloaded_Subunits := True;
1713 -- If the subunit is not already loaded, and we are generating code,
1714 -- then this is the case where compilation started from the parent, and
1715 -- we are generating code for an entire subunit tree. In that case we
1716 -- definitely need to load the subunit.
1718 -- In order to continue the analysis with the rest of the parent,
1719 -- and other subunits, we load the unit without requiring its
1720 -- presence, and emit a warning if not found, rather than terminating
1721 -- the compilation abruptly, as for other missing file problems.
1723 elsif Original_Operating_Mode = Generate_Code then
1725 -- If the proper body is already linked to the stub node, the stub is
1726 -- in a generic unit and just needs analyzing.
1728 -- We update the version. Although we are not strictly technically
1729 -- semantically dependent on the subunit, given our approach of macro
1730 -- substitution of subunits, it makes sense to include it in the
1731 -- version identification.
1733 if Present (Library_Unit (N)) then
1734 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1735 Analyze_Subunit (Library_Unit (N));
1736 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1738 -- Otherwise we must load the subunit and link to it
1741 -- Make sure that, if the subunit is preprocessed and -gnateG is
1742 -- specified, the preprocessed file will be written.
1744 Lib.Analysing_Subunit_Of_Main := True;
1747 (Load_Name => Subunit_Name,
1751 Lib.Analysing_Subunit_Of_Main := False;
1753 -- Give message if we did not get the unit Emit warning even if
1754 -- missing subunit is not within main unit, to simplify debugging.
1756 if Original_Operating_Mode = Generate_Code
1757 and then Unum = No_Unit
1759 Error_Msg_Unit_1 := Subunit_Name;
1761 Get_File_Name (Subunit_Name, Subunit => True);
1763 ("subunit$$ in file{ not found?!!", N);
1764 Subunits_Missing := True;
1767 -- Load_Unit may reset Compiler_State, since it may have been
1768 -- necessary to parse an additional units, so we make sure that
1769 -- we reset it to the Analyzing state.
1771 Compiler_State := Analyzing;
1773 if Unum /= No_Unit then
1774 if Debug_Flag_L then
1775 Write_Str ("*** Loaded subunit from stub. Analyze");
1780 Comp_Unit : constant Node_Id := Cunit (Unum);
1783 -- Check for child unit instead of subunit
1785 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1787 ("expected SEPARATE subunit, found child unit",
1788 Cunit_Entity (Unum));
1790 -- OK, we have a subunit
1793 -- Set corresponding stub (even if errors)
1795 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1797 -- Collect SCO information for loaded subunit if we are
1798 -- in the main unit).
1802 In_Extended_Main_Source_Unit
1803 (Cunit_Entity (Current_Sem_Unit))
1808 -- Analyze the unit if semantics active
1810 if not Fatal_Error (Unum) or else Try_Semantics then
1811 Analyze_Subunit (Comp_Unit);
1814 -- Set the library unit pointer in any case
1816 Set_Library_Unit (N, Comp_Unit);
1818 -- We update the version. Although we are not technically
1819 -- semantically dependent on the subunit, given our
1820 -- approach of macro substitution of subunits, it makes
1821 -- sense to include it in the version identification.
1823 Version_Update (Cunit (Main_Unit), Comp_Unit);
1829 -- The remaining case is when the subunit is not already loaded and we
1830 -- are not generating code. In this case we are just performing semantic
1831 -- analysis on the parent, and we are not interested in the subunit. For
1832 -- subprograms, analyze the stub as a body. For other entities the stub
1833 -- has already been marked as completed.
1838 end Analyze_Proper_Body;
1840 ----------------------------------
1841 -- Analyze_Protected_Body_Stub --
1842 ----------------------------------
1844 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1845 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1848 Check_Stub_Level (N);
1850 -- First occurrence of name may have been as an incomplete type
1852 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1853 Nam := Full_View (Nam);
1857 or else not Is_Protected_Type (Etype (Nam))
1859 Error_Msg_N ("missing specification for Protected body", N);
1861 Set_Scope (Defining_Entity (N), Current_Scope);
1862 Set_Has_Completion (Etype (Nam));
1863 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1864 Analyze_Proper_Body (N, Etype (Nam));
1866 end Analyze_Protected_Body_Stub;
1868 ----------------------------------
1869 -- Analyze_Subprogram_Body_Stub --
1870 ----------------------------------
1872 -- A subprogram body stub can appear with or without a previous spec. If
1873 -- there is one, then the analysis of the body will find it and verify
1874 -- conformance. The formals appearing in the specification of the stub play
1875 -- no role, except for requiring an additional conformance check. If there
1876 -- is no previous subprogram declaration, the stub acts as a spec, and
1877 -- provides the defining entity for the subprogram.
1879 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1883 Check_Stub_Level (N);
1885 -- Verify that the identifier for the stub is unique within this
1886 -- declarative part.
1888 if Nkind_In (Parent (N), N_Block_Statement,
1892 Decl := First (Declarations (Parent (N)));
1893 while Present (Decl)
1896 if Nkind (Decl) = N_Subprogram_Body_Stub
1897 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1898 Chars (Defining_Unit_Name (Specification (N))))
1900 Error_Msg_N ("identifier for stub is not unique", N);
1907 -- Treat stub as a body, which checks conformance if there is a previous
1908 -- declaration, or else introduces entity and its signature.
1910 Analyze_Subprogram_Body (N);
1911 Analyze_Proper_Body (N, Empty);
1912 end Analyze_Subprogram_Body_Stub;
1914 ---------------------
1915 -- Analyze_Subunit --
1916 ---------------------
1918 -- A subunit is compiled either by itself (for semantic checking) or as
1919 -- part of compiling the parent (for code generation). In either case, by
1920 -- the time we actually process the subunit, the parent has already been
1921 -- installed and analyzed. The node N is a compilation unit, whose context
1922 -- needs to be treated here, because we come directly here from the parent
1923 -- without calling Analyze_Compilation_Unit.
1925 -- The compilation context includes the explicit context of the subunit,
1926 -- and the context of the parent, together with the parent itself. In order
1927 -- to compile the current context, we remove the one inherited from the
1928 -- parent, in order to have a clean visibility table. We restore the parent
1929 -- context before analyzing the proper body itself. On exit, we remove only
1930 -- the explicit context of the subunit.
1932 procedure Analyze_Subunit (N : Node_Id) is
1933 Lib_Unit : constant Node_Id := Library_Unit (N);
1934 Par_Unit : constant Entity_Id := Current_Scope;
1936 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1937 Num_Scopes : Int := 0;
1938 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1939 Enclosing_Child : Entity_Id := Empty;
1940 Svg : constant Suppress_Array := Scope_Suppress;
1942 procedure Analyze_Subunit_Context;
1943 -- Capture names in use clauses of the subunit. This must be done before
1944 -- re-installing parent declarations, because items in the context must
1945 -- not be hidden by declarations local to the parent.
1947 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1948 -- Recursive procedure to restore scope of all ancestors of subunit,
1949 -- from outermost in. If parent is not a subunit, the call to install
1950 -- context installs context of spec and (if parent is a child unit) the
1951 -- context of its parents as well. It is confusing that parents should
1952 -- be treated differently in both cases, but the semantics are just not
1955 procedure Re_Install_Use_Clauses;
1956 -- As part of the removal of the parent scope, the use clauses are
1957 -- removed, to be reinstalled when the context of the subunit has been
1958 -- analyzed. Use clauses may also have been affected by the analysis of
1959 -- the context of the subunit, so they have to be applied again, to
1960 -- insure that the compilation environment of the rest of the parent
1961 -- unit is identical.
1963 procedure Remove_Scope;
1964 -- Remove current scope from scope stack, and preserve the list of use
1965 -- clauses in it, to be reinstalled after context is analyzed.
1967 -----------------------------
1968 -- Analyze_Subunit_Context --
1969 -----------------------------
1971 procedure Analyze_Subunit_Context is
1974 Unit_Name : Entity_Id;
1977 Analyze_Context (N);
1979 -- Make withed units immediately visible. If child unit, make the
1980 -- ultimate parent immediately visible.
1982 Item := First (Context_Items (N));
1983 while Present (Item) loop
1984 if Nkind (Item) = N_With_Clause then
1986 -- Protect frontend against previous errors in context clauses
1988 if Nkind (Name (Item)) /= N_Selected_Component then
1989 if Error_Posted (Item) then
1993 Unit_Name := Entity (Name (Item));
1994 while Is_Child_Unit (Unit_Name) loop
1995 Set_Is_Visible_Child_Unit (Unit_Name);
1996 Unit_Name := Scope (Unit_Name);
1999 if not Is_Immediately_Visible (Unit_Name) then
2000 Set_Is_Immediately_Visible (Unit_Name);
2001 Set_Context_Installed (Item);
2006 elsif Nkind (Item) = N_Use_Package_Clause then
2007 Nam := First (Names (Item));
2008 while Present (Nam) loop
2013 elsif Nkind (Item) = N_Use_Type_Clause then
2014 Nam := First (Subtype_Marks (Item));
2015 while Present (Nam) loop
2024 -- Reset visibility of withed units. They will be made visible again
2025 -- when we install the subunit context.
2027 Item := First (Context_Items (N));
2028 while Present (Item) loop
2029 if Nkind (Item) = N_With_Clause
2031 -- Protect frontend against previous errors in context clauses
2033 and then Nkind (Name (Item)) /= N_Selected_Component
2034 and then not Error_Posted (Item)
2036 Unit_Name := Entity (Name (Item));
2037 while Is_Child_Unit (Unit_Name) loop
2038 Set_Is_Visible_Child_Unit (Unit_Name, False);
2039 Unit_Name := Scope (Unit_Name);
2042 if Context_Installed (Item) then
2043 Set_Is_Immediately_Visible (Unit_Name, False);
2044 Set_Context_Installed (Item, False);
2050 end Analyze_Subunit_Context;
2052 ------------------------
2053 -- Re_Install_Parents --
2054 ------------------------
2056 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
2060 if Nkind (Unit (L)) = N_Subunit then
2061 Re_Install_Parents (Library_Unit (L), Scope (Scop));
2064 Install_Context (L);
2066 -- If the subunit occurs within a child unit, we must restore the
2067 -- immediate visibility of any siblings that may occur in context.
2069 if Present (Enclosing_Child) then
2070 Install_Siblings (Enclosing_Child, L);
2075 if Scop /= Par_Unit then
2076 Set_Is_Immediately_Visible (Scop);
2079 -- Make entities in scope visible again. For child units, restore
2080 -- visibility only if they are actually in context.
2082 E := First_Entity (Current_Scope);
2083 while Present (E) loop
2084 if not Is_Child_Unit (E)
2085 or else Is_Visible_Child_Unit (E)
2087 Set_Is_Immediately_Visible (E);
2093 -- A subunit appears within a body, and for a nested subunits all the
2094 -- parents are bodies. Restore full visibility of their private
2097 if Is_Package_Or_Generic_Package (Scop) then
2098 Set_In_Package_Body (Scop);
2099 Install_Private_Declarations (Scop);
2101 end Re_Install_Parents;
2103 ----------------------------
2104 -- Re_Install_Use_Clauses --
2105 ----------------------------
2107 procedure Re_Install_Use_Clauses is
2110 for J in reverse 1 .. Num_Scopes loop
2111 U := Use_Clauses (J);
2112 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2113 Install_Use_Clauses (U, Force_Installation => True);
2115 end Re_Install_Use_Clauses;
2121 procedure Remove_Scope is
2125 Num_Scopes := Num_Scopes + 1;
2126 Use_Clauses (Num_Scopes) :=
2127 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2129 E := First_Entity (Current_Scope);
2130 while Present (E) loop
2131 Set_Is_Immediately_Visible (E, False);
2135 if Is_Child_Unit (Current_Scope) then
2136 Enclosing_Child := Current_Scope;
2142 -- Start of processing for Analyze_Subunit
2147 Nam : Node_Id := Name (Unit (N));
2150 if Nkind (Nam) = N_Selected_Component then
2151 Nam := Selector_Name (Nam);
2154 Check_Identifier (Nam, Par_Unit);
2158 if not Is_Empty_List (Context_Items (N)) then
2160 -- Save current use clauses
2163 Remove_Context (Lib_Unit);
2165 -- Now remove parents and their context, including enclosing subunits
2166 -- and the outer parent body which is not a subunit.
2168 if Present (Lib_Spec) then
2169 Remove_Context (Lib_Spec);
2171 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2172 Lib_Spec := Library_Unit (Lib_Spec);
2174 Remove_Context (Lib_Spec);
2177 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2181 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2182 Remove_Context (Library_Unit (Lib_Spec));
2186 Set_Is_Immediately_Visible (Par_Unit, False);
2188 Analyze_Subunit_Context;
2190 Re_Install_Parents (Lib_Unit, Par_Unit);
2191 Set_Is_Immediately_Visible (Par_Unit);
2193 -- If the context includes a child unit of the parent of the subunit,
2194 -- the parent will have been removed from visibility, after compiling
2195 -- that cousin in the context. The visibility of the parent must be
2196 -- restored now. This also applies if the context includes another
2197 -- subunit of the same parent which in turn includes a child unit in
2200 if Is_Package_Or_Generic_Package (Par_Unit) then
2201 if not Is_Immediately_Visible (Par_Unit)
2202 or else (Present (First_Entity (Par_Unit))
2203 and then not Is_Immediately_Visible
2204 (First_Entity (Par_Unit)))
2206 Set_Is_Immediately_Visible (Par_Unit);
2207 Install_Visible_Declarations (Par_Unit);
2208 Install_Private_Declarations (Par_Unit);
2212 Re_Install_Use_Clauses;
2213 Install_Context (N);
2215 -- Restore state of suppress flags for current body
2217 Scope_Suppress := Svg;
2219 -- If the subunit is within a child unit, then siblings of any parent
2220 -- unit that appear in the context clause of the subunit must also be
2221 -- made immediately visible.
2223 if Present (Enclosing_Child) then
2224 Install_Siblings (Enclosing_Child, N);
2228 Analyze (Proper_Body (Unit (N)));
2231 -- The subunit may contain a with_clause on a sibling of some ancestor.
2232 -- Removing the context will remove from visibility those ancestor child
2233 -- units, which must be restored to the visibility they have in the
2236 if Present (Enclosing_Child) then
2242 and then Is_Child_Unit (C)
2244 Set_Is_Immediately_Visible (C);
2245 Set_Is_Visible_Child_Unit (C);
2250 end Analyze_Subunit;
2252 ----------------------------
2253 -- Analyze_Task_Body_Stub --
2254 ----------------------------
2256 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2257 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2258 Loc : constant Source_Ptr := Sloc (N);
2261 Check_Stub_Level (N);
2263 -- First occurrence of name may have been as an incomplete type
2265 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2266 Nam := Full_View (Nam);
2269 if No (Nam) or else not Is_Task_Type (Etype (Nam)) then
2270 Error_Msg_N ("missing specification for task body", N);
2272 Set_Scope (Defining_Entity (N), Current_Scope);
2273 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2275 -- Check for duplicate stub, if so give message and terminate
2277 if Has_Completion (Etype (Nam)) then
2278 Error_Msg_N ("duplicate stub for task", N);
2281 Set_Has_Completion (Etype (Nam));
2284 Analyze_Proper_Body (N, Etype (Nam));
2286 -- Set elaboration flag to indicate that entity is callable. This
2287 -- cannot be done in the expansion of the body itself, because the
2288 -- proper body is not in a declarative part. This is only done if
2289 -- expansion is active, because the context may be generic and the
2290 -- flag not defined yet.
2292 if Full_Expander_Active then
2294 Make_Assignment_Statement (Loc,
2296 Make_Identifier (Loc,
2297 Chars => New_External_Name (Chars (Etype (Nam)), 'E')),
2298 Expression => New_Reference_To (Standard_True, Loc)));
2301 end Analyze_Task_Body_Stub;
2303 -------------------------
2304 -- Analyze_With_Clause --
2305 -------------------------
2307 -- Analyze the declaration of a unit in a with clause. At end, label the
2308 -- with clause with the defining entity for the unit.
2310 procedure Analyze_With_Clause (N : Node_Id) is
2312 -- Retrieve the original kind of the unit node, before analysis. If it
2313 -- is a subprogram instantiation, its analysis below will rewrite the
2314 -- node as the declaration of the wrapper package. If the same
2315 -- instantiation appears indirectly elsewhere in the context, it will
2316 -- have been analyzed already.
2318 Unit_Kind : constant Node_Kind :=
2319 Nkind (Original_Node (Unit (Library_Unit (N))));
2320 Nam : constant Node_Id := Name (N);
2322 Par_Name : Entity_Id;
2327 -- Set True if the unit currently being compiled is an internal unit
2329 Save_Style_Check : constant Boolean := Opt.Style_Check;
2330 Save_C_Restrict : Save_Cunit_Boolean_Restrictions;
2333 U := Unit (Library_Unit (N));
2335 -- If this is an internal unit which is a renaming, then this is a
2336 -- violation of No_Obsolescent_Features.
2338 -- Note: this is not quite right if the user defines one of these units
2339 -- himself, but that's a marginal case, and fixing it is hard ???
2341 if Restriction_Check_Required (No_Obsolescent_Features) then
2343 F : constant File_Name_Type :=
2344 Unit_File_Name (Get_Source_Unit (U));
2346 if Is_Predefined_File_Name (F, Renamings_Included => True)
2348 Is_Predefined_File_Name (F, Renamings_Included => False)
2350 Check_Restriction (No_Obsolescent_Features, N);
2355 -- Save current restriction set, does not apply to with'ed unit
2357 Save_C_Restrict := Cunit_Boolean_Restrictions_Save;
2359 -- Several actions are skipped for dummy packages (those supplied for
2360 -- with's where no matching file could be found). Such packages are
2361 -- identified by the Sloc value being set to No_Location.
2363 if Limited_Present (N) then
2365 -- Ada 2005 (AI-50217): Build visibility structures but do not
2366 -- analyze the unit.
2368 if Sloc (U) /= No_Location then
2369 Build_Limited_Views (N);
2375 -- We reset ordinary style checking during the analysis of a with'ed
2376 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2377 -- definitely *does* apply to with'ed units).
2379 if not GNAT_Mode then
2380 Style_Check := False;
2383 -- If the library unit is a predefined unit, and we are in high
2384 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2385 -- for the analysis of the with'ed unit. This mode does not prevent
2386 -- explicit with'ing of run-time units.
2388 if Configurable_Run_Time_Mode
2389 and then Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (U)))
2391 Configurable_Run_Time_Mode := False;
2392 Semantics (Library_Unit (N));
2393 Configurable_Run_Time_Mode := True;
2396 Semantics (Library_Unit (N));
2399 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2401 if Sloc (U) /= No_Location then
2403 -- Check restrictions, except that we skip the check if this is an
2404 -- internal unit unless we are compiling the internal unit as the
2405 -- main unit. We also skip this for dummy packages.
2407 Check_Restriction_No_Dependence (Nam, N);
2409 if not Intunit or else Current_Sem_Unit = Main_Unit then
2410 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2413 -- Deal with special case of GNAT.Current_Exceptions which interacts
2414 -- with the optimization of local raise statements into gotos.
2416 if Nkind (Nam) = N_Selected_Component
2417 and then Nkind (Prefix (Nam)) = N_Identifier
2418 and then Chars (Prefix (Nam)) = Name_Gnat
2419 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2421 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2423 Check_Restriction (No_Exception_Propagation, N);
2424 Special_Exception_Package_Used := True;
2427 -- Check for inappropriate with of internal implementation unit if we
2428 -- are not compiling an internal unit. We do not issue this message
2429 -- for implicit with's generated by the compiler itself.
2431 if Implementation_Unit_Warnings
2432 and then not Intunit
2433 and then not Implicit_With (N)
2436 U_Kind : constant Kind_Of_Unit :=
2437 Get_Kind_Of_Unit (Get_Source_Unit (U));
2440 if U_Kind = Implementation_Unit then
2441 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2443 -- Add alternative name if available, otherwise issue a
2444 -- general warning message.
2446 if Error_Msg_Strlen /= 0 then
2447 Error_Msg_F ("\use ""~"" instead", Name (N));
2450 ("\use of this unit is non-portable " &
2451 "and version-dependent?", Name (N));
2454 elsif U_Kind = Ada_2005_Unit
2455 and then Ada_Version < Ada_2005
2456 and then Warn_On_Ada_2005_Compatibility
2458 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2460 elsif U_Kind = Ada_2012_Unit
2461 and then Ada_Version < Ada_2012
2462 and then Warn_On_Ada_2012_Compatibility
2464 Error_Msg_N ("& is an Ada 2012 unit?", Name (N));
2470 -- Semantic analysis of a generic unit is performed on a copy of
2471 -- the original tree. Retrieve the entity on which semantic info
2472 -- actually appears.
2474 if Unit_Kind in N_Generic_Declaration then
2475 E_Name := Defining_Entity (U);
2477 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2478 -- the case of an instantiation, semantic analysis above will have
2479 -- replaced the unit by its instantiated version. If the instance body
2480 -- has been generated, the instance now denotes the body entity. For
2481 -- visibility purposes we need the entity of its spec.
2483 elsif (Unit_Kind = N_Package_Instantiation
2484 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2485 N_Package_Instantiation)
2486 and then Nkind (U) = N_Package_Body
2488 E_Name := Corresponding_Spec (U);
2490 elsif Unit_Kind = N_Package_Instantiation
2491 and then Nkind (U) = N_Package_Instantiation
2492 and then Present (Instance_Spec (U))
2494 -- If the instance has not been rewritten as a package declaration,
2495 -- then it appeared already in a previous with clause. Retrieve
2496 -- the entity from the previous instance.
2498 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2500 elsif Unit_Kind in N_Subprogram_Instantiation then
2502 -- The visible subprogram is created during instantiation, and is
2503 -- an attribute of the wrapper package. We retrieve the wrapper
2504 -- package directly from the instantiation node. If the instance
2505 -- is inlined the unit is still an instantiation. Otherwise it has
2506 -- been rewritten as the declaration of the wrapper itself.
2508 if Nkind (U) in N_Subprogram_Instantiation then
2511 (Defining_Entity (Specification (Instance_Spec (U))));
2513 E_Name := Related_Instance (Defining_Entity (U));
2516 elsif Unit_Kind = N_Package_Renaming_Declaration
2517 or else Unit_Kind in N_Generic_Renaming_Declaration
2519 E_Name := Defining_Entity (U);
2521 elsif Unit_Kind = N_Subprogram_Body
2522 and then Nkind (Name (N)) = N_Selected_Component
2523 and then not Acts_As_Spec (Library_Unit (N))
2525 -- For a child unit that has no spec, one has been created and
2526 -- analyzed. The entity required is that of the spec.
2528 E_Name := Corresponding_Spec (U);
2531 E_Name := Defining_Entity (U);
2534 if Nkind (Name (N)) = N_Selected_Component then
2536 -- Child unit in a with clause
2538 Change_Selected_Component_To_Expanded_Name (Name (N));
2540 -- If this is a child unit without a spec, and it has been analyzed
2541 -- already, a declaration has been created for it. The with_clause
2542 -- must reflect the actual body, and not the generated declaration,
2543 -- to prevent spurious binding errors involving an out-of-date spec.
2544 -- Note that this can only happen if the unit includes more than one
2545 -- with_clause for the child unit (e.g. in separate subunits).
2547 if Unit_Kind = N_Subprogram_Declaration
2548 and then Analyzed (Library_Unit (N))
2549 and then not Comes_From_Source (Library_Unit (N))
2551 Set_Library_Unit (N,
2552 Cunit (Get_Source_Unit (Corresponding_Body (U))));
2556 -- Restore style checks and restrictions
2558 Style_Check := Save_Style_Check;
2559 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2561 -- Record the reference, but do NOT set the unit as referenced, we want
2562 -- to consider the unit as unreferenced if this is the only reference
2565 Set_Entity_With_Style_Check (Name (N), E_Name);
2566 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2568 -- Generate references and check No_Dependence restriction for parents
2570 if Is_Child_Unit (E_Name) then
2571 Pref := Prefix (Name (N));
2572 Par_Name := Scope (E_Name);
2573 while Nkind (Pref) = N_Selected_Component loop
2574 Change_Selected_Component_To_Expanded_Name (Pref);
2576 if Present (Entity (Selector_Name (Pref)))
2578 Present (Renamed_Entity (Entity (Selector_Name (Pref))))
2579 and then Entity (Selector_Name (Pref)) /= Par_Name
2581 -- The prefix is a child unit that denotes a renaming declaration.
2582 -- Replace the prefix directly with the renamed unit, because the
2583 -- rest of the prefix is irrelevant to the visibility of the real
2586 Rewrite (Pref, New_Occurrence_Of (Par_Name, Sloc (Pref)));
2590 Set_Entity_With_Style_Check (Pref, Par_Name);
2592 Generate_Reference (Par_Name, Pref);
2593 Check_Restriction_No_Dependence (Pref, N);
2594 Pref := Prefix (Pref);
2596 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2597 -- is set to Standard_Standard, and no attempt should be made to
2598 -- further unwind scopes.
2600 if Par_Name /= Standard_Standard then
2601 Par_Name := Scope (Par_Name);
2604 -- Abandon processing in case of previous errors
2606 if No (Par_Name) then
2607 pragma Assert (Serious_Errors_Detected /= 0);
2612 if Present (Entity (Pref))
2613 and then not Analyzed (Parent (Parent (Entity (Pref))))
2615 -- If the entity is set without its unit being compiled, the
2616 -- original parent is a renaming, and Par_Name is the renamed
2617 -- entity. For visibility purposes, we need the original entity,
2618 -- which must be analyzed now because Load_Unit directly retrieves
2619 -- the renamed unit, and the renaming declaration itself has not
2622 Analyze (Parent (Parent (Entity (Pref))));
2623 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2624 Par_Name := Entity (Pref);
2627 -- Guard against missing or misspelled child units
2629 if Present (Par_Name) then
2630 Set_Entity_With_Style_Check (Pref, Par_Name);
2631 Generate_Reference (Par_Name, Pref);
2634 Set_Name (N, Make_Null (Sloc (N)));
2639 -- If the withed unit is System, and a system extension pragma is
2640 -- present, compile the extension now, rather than waiting for a
2641 -- visibility check on a specific entity.
2643 if Chars (E_Name) = Name_System
2644 and then Scope (E_Name) = Standard_Standard
2645 and then Present (System_Extend_Unit)
2646 and then Present_System_Aux (N)
2648 -- If the extension is not present, an error will have been emitted
2653 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2654 -- to private_with units; they will be made visible later (just before
2655 -- the private part is analyzed)
2657 if Private_Present (N) then
2658 Set_Is_Immediately_Visible (E_Name, False);
2660 end Analyze_With_Clause;
2662 ------------------------------
2663 -- Check_Private_Child_Unit --
2664 ------------------------------
2666 procedure Check_Private_Child_Unit (N : Node_Id) is
2667 Lib_Unit : constant Node_Id := Unit (N);
2669 Curr_Unit : Entity_Id;
2670 Sub_Parent : Node_Id;
2671 Priv_Child : Entity_Id;
2672 Par_Lib : Entity_Id;
2675 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2676 -- Returns true if and only if the library unit is declared with
2677 -- an explicit designation of private.
2679 -----------------------------
2680 -- Is_Private_Library_Unit --
2681 -----------------------------
2683 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2684 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2687 return Private_Present (Comp_Unit);
2688 end Is_Private_Library_Unit;
2690 -- Start of processing for Check_Private_Child_Unit
2693 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2694 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2695 Par_Lib := Curr_Unit;
2697 elsif Nkind (Lib_Unit) = N_Subunit then
2699 -- The parent is itself a body. The parent entity is to be found in
2700 -- the corresponding spec.
2702 Sub_Parent := Library_Unit (N);
2703 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2705 -- If the parent itself is a subunit, Curr_Unit is the entity of the
2706 -- enclosing body, retrieve the spec entity which is the proper
2707 -- ancestor we need for the following tests.
2709 if Ekind (Curr_Unit) = E_Package_Body then
2710 Curr_Unit := Spec_Entity (Curr_Unit);
2713 Par_Lib := Curr_Unit;
2716 Curr_Unit := Defining_Entity (Lib_Unit);
2718 Par_Lib := Curr_Unit;
2719 Par_Spec := Parent_Spec (Lib_Unit);
2721 if No (Par_Spec) then
2724 Par_Lib := Defining_Entity (Unit (Par_Spec));
2728 -- Loop through context items
2730 Item := First (Context_Items (N));
2731 while Present (Item) loop
2733 -- Ada 2005 (AI-262): Allow private_with of a private child package
2734 -- in public siblings
2736 if Nkind (Item) = N_With_Clause
2737 and then not Implicit_With (Item)
2738 and then not Limited_Present (Item)
2739 and then Is_Private_Descendant (Entity (Name (Item)))
2741 Priv_Child := Entity (Name (Item));
2744 Curr_Parent : Entity_Id := Par_Lib;
2745 Child_Parent : Entity_Id := Scope (Priv_Child);
2746 Prv_Ancestor : Entity_Id := Child_Parent;
2747 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2750 -- If the child unit is a public child then locate the nearest
2751 -- private ancestor. Child_Parent will then be set to the
2752 -- parent of that ancestor.
2754 if not Is_Private_Library_Unit (Priv_Child) then
2755 while Present (Prv_Ancestor)
2756 and then not Is_Private_Library_Unit (Prv_Ancestor)
2758 Prv_Ancestor := Scope (Prv_Ancestor);
2761 if Present (Prv_Ancestor) then
2762 Child_Parent := Scope (Prv_Ancestor);
2766 while Present (Curr_Parent)
2767 and then Curr_Parent /= Standard_Standard
2768 and then Curr_Parent /= Child_Parent
2771 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2772 Curr_Parent := Scope (Curr_Parent);
2775 if No (Curr_Parent) then
2776 Curr_Parent := Standard_Standard;
2779 if Curr_Parent /= Child_Parent then
2780 if Ekind (Priv_Child) = E_Generic_Package
2781 and then Chars (Priv_Child) in Text_IO_Package_Name
2782 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2785 ("& is a nested package, not a compilation unit",
2786 Name (Item), Priv_Child);
2790 ("unit in with clause is private child unit!", Item);
2792 ("\current unit must also have parent&!",
2793 Item, Child_Parent);
2797 or else Private_Present (Item)
2798 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2799 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2800 and then not Acts_As_Spec (Parent (Lib_Unit)))
2806 ("current unit must also be private descendant of&",
2807 Item, Child_Parent);
2815 end Check_Private_Child_Unit;
2817 ----------------------
2818 -- Check_Stub_Level --
2819 ----------------------
2821 procedure Check_Stub_Level (N : Node_Id) is
2822 Par : constant Node_Id := Parent (N);
2823 Kind : constant Node_Kind := Nkind (Par);
2826 if Nkind_In (Kind, N_Package_Body,
2830 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2834 -- In an instance, a missing stub appears at any level. A warning
2835 -- message will have been emitted already for the missing file.
2837 elsif not In_Instance then
2838 Error_Msg_N ("stub cannot appear in an inner scope", N);
2840 elsif Expander_Active then
2841 Error_Msg_N ("missing proper body", N);
2843 end Check_Stub_Level;
2845 ------------------------
2846 -- Expand_With_Clause --
2847 ------------------------
2849 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2850 Loc : constant Source_Ptr := Sloc (Nam);
2851 Ent : constant Entity_Id := Entity (Nam);
2855 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2856 -- Build name to be used in implicit with_clause. In most cases this
2857 -- is the source name, but if renamings are present we must make the
2858 -- original unit visible, not the one it renames. The entity in the
2859 -- with clause is the renamed unit, but the identifier is the one from
2860 -- the source, which allows us to recover the unit renaming.
2862 ---------------------
2863 -- Build_Unit_Name --
2864 ---------------------
2866 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2868 Renaming : Entity_Id;
2872 if Nkind (Nam) = N_Identifier then
2874 -- If the parent unit P in the name of the with_clause for P.Q is
2875 -- a renaming of package R, then the entity of the parent is set
2876 -- to R, but the identifier retains Chars (P) to be consistent
2877 -- with the source (see details in lib-load). However the implicit
2878 -- with_clause for the parent must make the entity for P visible,
2879 -- because P.Q may be used as a prefix within the current unit.
2880 -- The entity for P is the current_entity with that name, because
2881 -- the package renaming declaration for it has just been analyzed.
2882 -- Note that this case can only happen if P.Q has already appeared
2883 -- in a previous with_clause in a related unit, such as the
2884 -- library body of the current unit.
2886 if Chars (Nam) /= Chars (Entity (Nam)) then
2887 Renaming := Current_Entity (Nam);
2888 pragma Assert (Renamed_Entity (Renaming) = Entity (Nam));
2889 return New_Occurrence_Of (Renaming, Loc);
2892 return New_Occurrence_Of (Entity (Nam), Loc);
2896 Ent := Entity (Nam);
2898 if Present (Entity (Selector_Name (Nam)))
2899 and then Chars (Entity (Selector_Name (Nam))) /= Chars (Ent)
2901 Nkind (Unit_Declaration_Node (Entity (Selector_Name (Nam))))
2902 = N_Package_Renaming_Declaration
2904 -- The name in the with_clause is of the form A.B.C, and B is
2905 -- given by a renaming declaration. In that case we may not
2906 -- have analyzed the unit for B, but replaced it directly in
2907 -- lib-load with the unit it renames. We have to make A.B
2908 -- visible, so analyze the declaration for B now, in case it
2909 -- has not been done yet.
2911 Ent := Entity (Selector_Name (Nam));
2914 (Unit_Declaration_Node (Entity (Selector_Name (Nam)))));
2918 Make_Expanded_Name (Loc,
2919 Chars => Chars (Entity (Nam)),
2920 Prefix => Build_Unit_Name (Prefix (Nam)),
2921 Selector_Name => New_Occurrence_Of (Ent, Loc));
2922 Set_Entity (Result, Ent);
2925 end Build_Unit_Name;
2927 -- Start of processing for Expand_With_Clause
2930 New_Nodes_OK := New_Nodes_OK + 1;
2932 Make_With_Clause (Loc,
2933 Name => Build_Unit_Name (Nam));
2935 P := Parent (Unit_Declaration_Node (Ent));
2936 Set_Library_Unit (Withn, P);
2937 Set_Corresponding_Spec (Withn, Ent);
2938 Set_First_Name (Withn, True);
2939 Set_Implicit_With (Withn, True);
2941 -- If the unit is a package declaration, a private_with_clause on a
2942 -- child unit implies the implicit with on the parent is also private.
2944 if Nkind (Unit (N)) = N_Package_Declaration then
2945 Set_Private_Present (Withn, Private_Present (Item));
2948 Prepend (Withn, Context_Items (N));
2949 Mark_Rewrite_Insertion (Withn);
2950 Install_Withed_Unit (Withn);
2952 if Nkind (Nam) = N_Expanded_Name then
2953 Expand_With_Clause (Item, Prefix (Nam), N);
2956 New_Nodes_OK := New_Nodes_OK - 1;
2957 end Expand_With_Clause;
2959 -----------------------
2960 -- Get_Parent_Entity --
2961 -----------------------
2963 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2965 if Nkind (Unit) = N_Package_Body
2966 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2968 return Defining_Entity
2969 (Specification (Instance_Spec (Original_Node (Unit))));
2970 elsif Nkind (Unit) = N_Package_Instantiation then
2971 return Defining_Entity (Specification (Instance_Spec (Unit)));
2973 return Defining_Entity (Unit);
2975 end Get_Parent_Entity;
2977 ---------------------
2978 -- Has_With_Clause --
2979 ---------------------
2981 function Has_With_Clause
2984 Is_Limited : Boolean := False) return Boolean
2988 function Named_Unit (Clause : Node_Id) return Entity_Id;
2989 -- Return the entity for the unit named in a [limited] with clause
2995 function Named_Unit (Clause : Node_Id) return Entity_Id is
2997 if Nkind (Name (Clause)) = N_Selected_Component then
2998 return Entity (Selector_Name (Name (Clause)));
3000 return Entity (Name (Clause));
3004 -- Start of processing for Has_With_Clause
3007 if Present (Context_Items (C_Unit)) then
3008 Item := First (Context_Items (C_Unit));
3009 while Present (Item) loop
3010 if Nkind (Item) = N_With_Clause
3011 and then Limited_Present (Item) = Is_Limited
3012 and then Named_Unit (Item) = Pack
3022 end Has_With_Clause;
3024 -----------------------------
3025 -- Implicit_With_On_Parent --
3026 -----------------------------
3028 procedure Implicit_With_On_Parent
3029 (Child_Unit : Node_Id;
3032 Loc : constant Source_Ptr := Sloc (N);
3033 P : constant Node_Id := Parent_Spec (Child_Unit);
3034 P_Unit : Node_Id := Unit (P);
3035 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
3038 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
3039 -- Build prefix of child unit name. Recurse if needed
3041 function Build_Unit_Name return Node_Id;
3042 -- If the unit is a child unit, build qualified name with all ancestors
3044 -------------------------
3045 -- Build_Ancestor_Name --
3046 -------------------------
3048 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
3049 P_Ref : constant Node_Id :=
3050 New_Reference_To (Defining_Entity (P), Loc);
3051 P_Spec : Node_Id := P;
3054 -- Ancestor may have been rewritten as a package body. Retrieve
3055 -- the original spec to trace earlier ancestors.
3057 if Nkind (P) = N_Package_Body
3058 and then Nkind (Original_Node (P)) = N_Package_Instantiation
3060 P_Spec := Original_Node (P);
3063 if No (Parent_Spec (P_Spec)) then
3067 Make_Selected_Component (Loc,
3068 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
3069 Selector_Name => P_Ref);
3071 end Build_Ancestor_Name;
3073 ---------------------
3074 -- Build_Unit_Name --
3075 ---------------------
3077 function Build_Unit_Name return Node_Id is
3081 if No (Parent_Spec (P_Unit)) then
3082 return New_Reference_To (P_Name, Loc);
3086 Make_Expanded_Name (Loc,
3087 Chars => Chars (P_Name),
3088 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
3089 Selector_Name => New_Reference_To (P_Name, Loc));
3090 Set_Entity (Result, P_Name);
3093 end Build_Unit_Name;
3095 -- Start of processing for Implicit_With_On_Parent
3098 -- The unit of the current compilation may be a package body that
3099 -- replaces an instance node. In this case we need the original instance
3100 -- node to construct the proper parent name.
3102 if Nkind (P_Unit) = N_Package_Body
3103 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
3105 P_Unit := Original_Node (P_Unit);
3108 -- We add the implicit with if the child unit is the current unit being
3109 -- compiled. If the current unit is a body, we do not want to add an
3110 -- implicit_with a second time to the corresponding spec.
3112 if Nkind (Child_Unit) = N_Package_Declaration
3113 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
3118 New_Nodes_OK := New_Nodes_OK + 1;
3119 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
3121 Set_Library_Unit (Withn, P);
3122 Set_Corresponding_Spec (Withn, P_Name);
3123 Set_First_Name (Withn, True);
3124 Set_Implicit_With (Withn, True);
3126 -- Node is placed at the beginning of the context items, so that
3127 -- subsequent use clauses on the parent can be validated.
3129 Prepend (Withn, Context_Items (N));
3130 Mark_Rewrite_Insertion (Withn);
3131 Install_Withed_Unit (Withn);
3133 if Is_Child_Spec (P_Unit) then
3134 Implicit_With_On_Parent (P_Unit, N);
3137 New_Nodes_OK := New_Nodes_OK - 1;
3138 end Implicit_With_On_Parent;
3144 function In_Chain (E : Entity_Id) return Boolean is
3148 H := Current_Entity (E);
3149 while Present (H) loop
3160 ---------------------
3161 -- Install_Context --
3162 ---------------------
3164 procedure Install_Context (N : Node_Id) is
3165 Lib_Unit : constant Node_Id := Unit (N);
3168 Install_Context_Clauses (N);
3170 if Is_Child_Spec (Lib_Unit) then
3171 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
3174 Install_Limited_Context_Clauses (N);
3175 end Install_Context;
3177 -----------------------------
3178 -- Install_Context_Clauses --
3179 -----------------------------
3181 procedure Install_Context_Clauses (N : Node_Id) is
3182 Lib_Unit : constant Node_Id := Unit (N);
3184 Uname_Node : Entity_Id;
3185 Check_Private : Boolean := False;
3186 Decl_Node : Node_Id;
3187 Lib_Parent : Entity_Id;
3190 -- First skip configuration pragmas at the start of the context. They
3191 -- are not technically part of the context clause, but that's where the
3192 -- parser puts them. Note they were analyzed in Analyze_Context.
3194 Item := First (Context_Items (N));
3195 while Present (Item)
3196 and then Nkind (Item) = N_Pragma
3197 and then Pragma_Name (Item) in Configuration_Pragma_Names
3202 -- Loop through the actual context clause items. We process everything
3203 -- except Limited_With clauses in this routine. Limited_With clauses
3204 -- are separately installed (see Install_Limited_Context_Clauses).
3206 while Present (Item) loop
3208 -- Case of explicit WITH clause
3210 if Nkind (Item) = N_With_Clause
3211 and then not Implicit_With (Item)
3213 if Limited_Present (Item) then
3215 -- Limited withed units will be installed later
3219 -- If Name (Item) is not an entity name, something is wrong, and
3220 -- this will be detected in due course, for now ignore the item
3222 elsif not Is_Entity_Name (Name (Item)) then
3225 elsif No (Entity (Name (Item))) then
3226 Set_Entity (Name (Item), Any_Id);
3230 Uname_Node := Entity (Name (Item));
3232 if Is_Private_Descendant (Uname_Node) then
3233 Check_Private := True;
3236 Install_Withed_Unit (Item);
3238 Decl_Node := Unit_Declaration_Node (Uname_Node);
3240 -- If the unit is a subprogram instance, it appears nested within
3241 -- a package that carries the parent information.
3243 if Is_Generic_Instance (Uname_Node)
3244 and then Ekind (Uname_Node) /= E_Package
3246 Decl_Node := Parent (Parent (Decl_Node));
3249 if Is_Child_Spec (Decl_Node) then
3250 if Nkind (Name (Item)) = N_Expanded_Name then
3251 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3253 -- If not an expanded name, the child unit must be a
3254 -- renaming, nothing to do.
3259 elsif Nkind (Decl_Node) = N_Subprogram_Body
3260 and then not Acts_As_Spec (Parent (Decl_Node))
3261 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3263 Implicit_With_On_Parent
3264 (Unit (Library_Unit (Parent (Decl_Node))), N);
3267 -- Check license conditions unless this is a dummy unit
3269 if Sloc (Library_Unit (Item)) /= No_Location then
3270 License_Check : declare
3271 Withu : constant Unit_Number_Type :=
3272 Get_Source_Unit (Library_Unit (Item));
3273 Withl : constant License_Type :=
3274 License (Source_Index (Withu));
3275 Unitl : constant License_Type :=
3276 License (Source_Index (Current_Sem_Unit));
3278 procedure License_Error;
3279 -- Signal error of bad license
3285 procedure License_Error is
3288 ("?license of with'ed unit & may be inconsistent",
3292 -- Start of processing for License_Check
3295 -- Exclude license check if withed unit is an internal unit.
3296 -- This situation arises e.g. with the GPL version of GNAT.
3298 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3301 -- Otherwise check various cases
3313 if Withl = Restricted then
3317 when Modified_GPL =>
3318 if Withl = Restricted or else Withl = GPL then
3322 when Unrestricted =>
3329 -- Case of USE PACKAGE clause
3331 elsif Nkind (Item) = N_Use_Package_Clause then
3332 Analyze_Use_Package (Item);
3334 -- Case of USE TYPE clause
3336 elsif Nkind (Item) = N_Use_Type_Clause then
3337 Analyze_Use_Type (Item);
3341 elsif Nkind (Item) = N_Pragma then
3349 if Is_Child_Spec (Lib_Unit) then
3351 -- The unit also has implicit with_clauses on its own parents
3353 if No (Context_Items (N)) then
3354 Set_Context_Items (N, New_List);
3357 Implicit_With_On_Parent (Lib_Unit, N);
3360 -- If the unit is a body, the context of the specification must also
3361 -- be installed. That includes private with_clauses in that context.
3363 if Nkind (Lib_Unit) = N_Package_Body
3364 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3365 and then not Acts_As_Spec (N))
3367 Install_Context (Library_Unit (N));
3369 -- Only install private with-clauses of a spec that comes from
3370 -- source, excluding specs created for a subprogram body that is
3373 if Comes_From_Source (Library_Unit (N)) then
3374 Install_Private_With_Clauses
3375 (Defining_Entity (Unit (Library_Unit (N))));
3378 if Is_Child_Spec (Unit (Library_Unit (N))) then
3380 -- If the unit is the body of a public child unit, the private
3381 -- declarations of the parent must be made visible. If the child
3382 -- unit is private, the private declarations have been installed
3383 -- already in the call to Install_Parents for the spec. Installing
3384 -- private declarations must be done for all ancestors of public
3385 -- child units. In addition, sibling units mentioned in the
3386 -- context clause of the body are directly visible.
3394 Lib_Spec := Unit (Library_Unit (N));
3395 while Is_Child_Spec (Lib_Spec) loop
3396 P := Unit (Parent_Spec (Lib_Spec));
3397 P_Name := Defining_Entity (P);
3399 if not (Private_Present (Parent (Lib_Spec)))
3400 and then not In_Private_Part (P_Name)
3402 Install_Private_Declarations (P_Name);
3403 Install_Private_With_Clauses (P_Name);
3404 Set_Use (Private_Declarations (Specification (P)));
3412 -- For a package body, children in context are immediately visible
3414 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3417 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3418 N_Generic_Subprogram_Declaration,
3419 N_Package_Declaration,
3420 N_Subprogram_Declaration)
3422 if Is_Child_Spec (Lib_Unit) then
3423 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3424 Set_Is_Private_Descendant
3425 (Defining_Entity (Lib_Unit),
3426 Is_Private_Descendant (Lib_Parent)
3427 or else Private_Present (Parent (Lib_Unit)));
3430 Set_Is_Private_Descendant
3431 (Defining_Entity (Lib_Unit),
3432 Private_Present (Parent (Lib_Unit)));
3436 if Check_Private then
3437 Check_Private_Child_Unit (N);
3439 end Install_Context_Clauses;
3441 -------------------------------------
3442 -- Install_Limited_Context_Clauses --
3443 -------------------------------------
3445 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3448 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3449 -- Check that the unlimited view of a given compilation_unit is not
3450 -- already visible through "use + renamings".
3452 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3453 -- Check that if a limited_with clause of a given compilation_unit
3454 -- mentions a descendant of a private child of some library unit, then
3455 -- the given compilation_unit shall be the declaration of a private
3456 -- descendant of that library unit, or a public descendant of such. The
3457 -- code is analogous to that of Check_Private_Child_Unit but we cannot
3458 -- use entities on the limited with_clauses because their units have not
3459 -- been analyzed, so we have to climb the tree of ancestors looking for
3460 -- private keywords.
3462 procedure Expand_Limited_With_Clause
3463 (Comp_Unit : Node_Id;
3466 -- If a child unit appears in a limited_with clause, there are implicit
3467 -- limited_with clauses on all parents that are not already visible
3468 -- through a regular with clause. This procedure creates the implicit
3469 -- limited with_clauses for the parents and loads the corresponding
3470 -- units. The shadow entities are created when the inserted clause is
3471 -- analyzed. Implements Ada 2005 (AI-50217).
3473 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean;
3474 -- When compiling a unit Q descended from some parent unit P, a limited
3475 -- with_clause in the context of P that names some other ancestor of Q
3476 -- must not be installed because the ancestor is immediately visible.
3478 ---------------------
3479 -- Check_Renamings --
3480 ---------------------
3482 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3491 pragma Assert (Nkind (W) = N_With_Clause);
3493 -- Protect the frontend against previous critical errors
3495 case Nkind (Unit (Library_Unit (W))) is
3496 when N_Subprogram_Declaration |
3497 N_Package_Declaration |
3498 N_Generic_Subprogram_Declaration |
3499 N_Generic_Package_Declaration =>
3506 -- Check "use + renamings"
3508 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3509 Spec := Specification (Unit (P));
3511 Item := First (Visible_Declarations (Spec));
3512 while Present (Item) loop
3514 -- Look only at use package clauses
3516 if Nkind (Item) = N_Use_Package_Clause then
3518 -- Traverse the list of packages
3520 Nam := First (Names (Item));
3521 while Present (Nam) loop
3524 pragma Assert (Present (Parent (E)));
3526 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3527 and then Renamed_Entity (E) = WEnt
3529 -- The unlimited view is visible through use clause and
3530 -- renamings. There is no need to generate the error
3531 -- message here because Is_Visible_Through_Renamings
3532 -- takes care of generating the precise error message.
3536 elsif Nkind (Parent (E)) = N_Package_Specification then
3538 -- The use clause may refer to a local package.
3539 -- Check all the enclosing scopes.
3542 while E2 /= Standard_Standard
3550 ("unlimited view visible through use clause ", W);
3562 -- Recursive call to check all the ancestors
3564 if Is_Child_Spec (Unit (P)) then
3565 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3567 end Check_Renamings;
3569 ---------------------------------------
3570 -- Check_Private_Limited_Withed_Unit --
3571 ---------------------------------------
3573 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3574 Curr_Parent : Node_Id;
3575 Child_Parent : Node_Id;
3576 Curr_Private : Boolean;
3579 -- Compilation unit of the parent of the withed library unit
3581 Child_Parent := Library_Unit (Item);
3583 -- If the child unit is a public child, then locate its nearest
3584 -- private ancestor, if any, then Child_Parent will then be set to
3585 -- the parent of that ancestor.
3587 if not Private_Present (Library_Unit (Item)) then
3588 while Present (Child_Parent)
3589 and then not Private_Present (Child_Parent)
3591 Child_Parent := Parent_Spec (Unit (Child_Parent));
3594 if No (Child_Parent) then
3599 Child_Parent := Parent_Spec (Unit (Child_Parent));
3601 -- Traverse all the ancestors of the current compilation unit to
3602 -- check if it is a descendant of named library unit.
3604 Curr_Parent := Parent (Item);
3605 Curr_Private := Private_Present (Curr_Parent);
3607 while Present (Parent_Spec (Unit (Curr_Parent)))
3608 and then Curr_Parent /= Child_Parent
3610 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3611 Curr_Private := Curr_Private or else Private_Present (Curr_Parent);
3614 if Curr_Parent /= Child_Parent then
3616 ("unit in with clause is private child unit!", Item);
3618 ("\current unit must also have parent&!",
3619 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3621 elsif Private_Present (Parent (Item))
3622 or else Curr_Private
3623 or else Private_Present (Item)
3624 or else Nkind_In (Unit (Parent (Item)), N_Package_Body,
3628 -- Current unit is private, of descendant of a private unit
3634 ("current unit must also be private descendant of&",
3635 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3637 end Check_Private_Limited_Withed_Unit;
3639 --------------------------------
3640 -- Expand_Limited_With_Clause --
3641 --------------------------------
3643 procedure Expand_Limited_With_Clause
3644 (Comp_Unit : Node_Id;
3648 Loc : constant Source_Ptr := Sloc (Nam);
3649 Unum : Unit_Number_Type;
3652 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3653 -- Returns true if the context already includes a with_clause for
3654 -- this unit. If the with_clause is non-limited, the unit is fully
3655 -- visible and an implicit limited_with should not be created. If
3656 -- there is already a limited_with clause for W, a second one is
3657 -- simply redundant.
3659 --------------------------
3660 -- Previous_Withed_Unit --
3661 --------------------------
3663 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3667 -- A limited with_clause cannot appear in the same context_clause
3668 -- as a nonlimited with_clause which mentions the same library.
3670 Item := First (Context_Items (Comp_Unit));
3671 while Present (Item) loop
3672 if Nkind (Item) = N_With_Clause
3673 and then Library_Unit (Item) = Library_Unit (W)
3682 end Previous_Withed_Unit;
3684 -- Start of processing for Expand_Limited_With_Clause
3687 New_Nodes_OK := New_Nodes_OK + 1;
3689 if Nkind (Nam) = N_Identifier then
3691 -- Create node for name of withed unit
3694 Make_With_Clause (Loc,
3695 Name => New_Copy (Nam));
3697 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3699 Make_With_Clause (Loc,
3700 Name => Make_Selected_Component (Loc,
3701 Prefix => New_Copy_Tree (Prefix (Nam)),
3702 Selector_Name => New_Copy (Selector_Name (Nam))));
3703 Set_Parent (Withn, Parent (N));
3706 Set_Limited_Present (Withn);
3707 Set_First_Name (Withn);
3708 Set_Implicit_With (Withn);
3712 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3717 -- Do not generate a limited_with_clause on the current unit. This
3718 -- path is taken when a unit has a limited_with clause on one of its
3721 if Unum = Current_Sem_Unit then
3725 Set_Library_Unit (Withn, Cunit (Unum));
3726 Set_Corresponding_Spec
3727 (Withn, Specification (Unit (Cunit (Unum))));
3729 if not Previous_Withed_Unit (Withn) then
3730 Prepend (Withn, Context_Items (Parent (N)));
3731 Mark_Rewrite_Insertion (Withn);
3733 -- Add implicit limited_with_clauses for parents of child units
3734 -- mentioned in limited_with clauses.
3736 if Nkind (Nam) = N_Selected_Component then
3737 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3742 if not Limited_View_Installed (Withn) then
3743 Install_Limited_Withed_Unit (Withn);
3747 New_Nodes_OK := New_Nodes_OK - 1;
3748 end Expand_Limited_With_Clause;
3750 ----------------------
3751 -- Is_Ancestor_Unit --
3752 ----------------------
3754 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean is
3755 E1 : constant Entity_Id := Defining_Entity (Unit (U1));
3758 if Nkind_In (Unit (U2), N_Package_Body, N_Subprogram_Body) then
3759 E2 := Defining_Entity (Unit (Library_Unit (U2)));
3760 return Is_Ancestor_Package (E1, E2);
3764 end Is_Ancestor_Unit;
3766 -- Start of processing for Install_Limited_Context_Clauses
3769 Item := First (Context_Items (N));
3770 while Present (Item) loop
3771 if Nkind (Item) = N_With_Clause
3772 and then Limited_Present (Item)
3773 and then not Error_Posted (Item)
3775 if Nkind (Name (Item)) = N_Selected_Component then
3776 Expand_Limited_With_Clause
3777 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3780 Check_Private_Limited_Withed_Unit (Item);
3782 if not Implicit_With (Item)
3783 and then Is_Child_Spec (Unit (N))
3785 Check_Renamings (Parent_Spec (Unit (N)), Item);
3788 -- A unit may have a limited with on itself if it has a limited
3789 -- with_clause on one of its child units. In that case it is
3790 -- already being compiled and it makes no sense to install its
3793 -- If the item is a limited_private_with_clause, install it if the
3794 -- current unit is a body or if it is a private child. Otherwise
3795 -- the private clause is installed before analyzing the private
3796 -- part of the current unit.
3798 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3799 and then not Limited_View_Installed (Item)
3801 not Is_Ancestor_Unit
3802 (Library_Unit (Item), Cunit (Current_Sem_Unit))
3804 if not Private_Present (Item)
3805 or else Private_Present (N)
3806 or else Nkind_In (Unit (N), N_Package_Body,
3810 Install_Limited_Withed_Unit (Item);
3818 -- Ada 2005 (AI-412): Examine visible declarations of a package spec,
3819 -- looking for incomplete subtype declarations of incomplete types
3820 -- visible through a limited with clause.
3822 if Ada_Version >= Ada_2005
3823 and then Analyzed (N)
3824 and then Nkind (Unit (N)) = N_Package_Declaration
3829 Non_Lim_View : Entity_Id;
3832 Decl := First (Visible_Declarations (Specification (Unit (N))));
3833 while Present (Decl) loop
3834 if Nkind (Decl) = N_Subtype_Declaration
3836 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3838 From_With_Type (Defining_Identifier (Decl))
3840 Def_Id := Defining_Identifier (Decl);
3841 Non_Lim_View := Non_Limited_View (Def_Id);
3843 if not Is_Incomplete_Type (Non_Lim_View) then
3845 -- Convert an incomplete subtype declaration into a
3846 -- corresponding non-limited view subtype declaration.
3847 -- This is usually the case when analyzing a body that
3848 -- has regular with clauses, when the spec has limited
3851 -- If the non-limited view is still incomplete, it is
3852 -- the dummy entry already created, and the declaration
3853 -- cannot be reanalyzed. This is the case when installing
3854 -- a parent unit that has limited with-clauses.
3856 Set_Subtype_Indication (Decl,
3857 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3858 Set_Etype (Def_Id, Non_Lim_View);
3859 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3860 Set_Analyzed (Decl, False);
3862 -- Reanalyze the declaration, suppressing the call to
3863 -- Enter_Name to avoid duplicate names.
3865 Analyze_Subtype_Declaration
3875 end Install_Limited_Context_Clauses;
3877 ---------------------
3878 -- Install_Parents --
3879 ---------------------
3881 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3888 P := Unit (Parent_Spec (Lib_Unit));
3889 P_Name := Get_Parent_Entity (P);
3891 if Etype (P_Name) = Any_Type then
3895 if Ekind (P_Name) = E_Generic_Package
3896 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3897 N_Generic_Package_Declaration)
3898 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3901 ("child of a generic package must be a generic unit", Lib_Unit);
3903 elsif not Is_Package_Or_Generic_Package (P_Name) then
3905 ("parent unit must be package or generic package", Lib_Unit);
3906 raise Unrecoverable_Error;
3908 elsif Present (Renamed_Object (P_Name)) then
3909 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3910 raise Unrecoverable_Error;
3912 -- Verify that a child of an instance is itself an instance, or the
3913 -- renaming of one. Given that an instance that is a unit is replaced
3914 -- with a package declaration, check against the original node. The
3915 -- parent may be currently being instantiated, in which case it appears
3916 -- as a declaration, but the generic_parent is already established
3917 -- indicating that we deal with an instance.
3919 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3920 if Nkind (Lib_Unit) in N_Renaming_Declaration
3921 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3923 (Nkind (Lib_Unit) = N_Package_Declaration
3924 and then Present (Generic_Parent (Specification (Lib_Unit))))
3929 ("child of an instance must be an instance or renaming",
3934 -- This is the recursive call that ensures all parents are loaded
3936 if Is_Child_Spec (P) then
3938 Is_Private or else Private_Present (Parent (Lib_Unit)));
3941 -- Now we can install the context for this parent
3943 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3944 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3945 Install_Siblings (P_Name, Parent (Lib_Unit));
3947 -- The child unit is in the declarative region of the parent. The parent
3948 -- must therefore appear in the scope stack and be visible, as when
3949 -- compiling the corresponding body. If the child unit is private or it
3950 -- is a package body, private declarations must be accessible as well.
3951 -- Use declarations in the parent must also be installed. Finally, other
3952 -- child units of the same parent that are in the context are
3953 -- immediately visible.
3955 -- Find entity for compilation unit, and set its private descendant
3956 -- status as needed. Indicate that it is a compilation unit, which is
3957 -- redundant in general, but needed if this is a generated child spec
3958 -- for a child body without previous spec.
3960 E_Name := Defining_Entity (Lib_Unit);
3962 Set_Is_Child_Unit (E_Name);
3963 Set_Is_Compilation_Unit (E_Name);
3965 Set_Is_Private_Descendant (E_Name,
3966 Is_Private_Descendant (P_Name)
3967 or else Private_Present (Parent (Lib_Unit)));
3969 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3970 Push_Scope (P_Name);
3972 -- Save current visibility of unit
3974 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3975 Is_Immediately_Visible (P_Name);
3976 Set_Is_Immediately_Visible (P_Name);
3977 Install_Visible_Declarations (P_Name);
3978 Set_Use (Visible_Declarations (P_Spec));
3980 -- If the parent is a generic unit, its formal part may contain formal
3981 -- packages and use clauses for them.
3983 if Ekind (P_Name) = E_Generic_Package then
3984 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3988 or else Private_Present (Parent (Lib_Unit))
3990 Install_Private_Declarations (P_Name);
3991 Install_Private_With_Clauses (P_Name);
3992 Set_Use (Private_Declarations (P_Spec));
3994 end Install_Parents;
3996 ----------------------------------
3997 -- Install_Private_With_Clauses --
3998 ----------------------------------
4000 procedure Install_Private_With_Clauses (P : Entity_Id) is
4001 Decl : constant Node_Id := Unit_Declaration_Node (P);
4005 if Debug_Flag_I then
4006 Write_Str ("install private with clauses of ");
4007 Write_Name (Chars (P));
4011 if Nkind (Parent (Decl)) = N_Compilation_Unit then
4012 Item := First (Context_Items (Parent (Decl)));
4013 while Present (Item) loop
4014 if Nkind (Item) = N_With_Clause
4015 and then Private_Present (Item)
4017 if Limited_Present (Item) then
4018 if not Limited_View_Installed (Item) then
4019 Install_Limited_Withed_Unit (Item);
4022 Install_Withed_Unit (Item, Private_With_OK => True);
4029 end Install_Private_With_Clauses;
4031 ----------------------
4032 -- Install_Siblings --
4033 ----------------------
4035 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
4041 -- Iterate over explicit with clauses, and check whether the scope of
4042 -- each entity is an ancestor of the current unit, in which case it is
4043 -- immediately visible.
4045 Item := First (Context_Items (N));
4046 while Present (Item) loop
4048 -- Do not install private_with_clauses declaration, unless unit
4049 -- is itself a private child unit, or is a body. Note that for a
4050 -- subprogram body the private_with_clause does not take effect until
4051 -- after the specification.
4053 if Nkind (Item) /= N_With_Clause
4054 or else Implicit_With (Item)
4055 or else Limited_Present (Item)
4059 elsif not Private_Present (Item)
4060 or else Private_Present (N)
4061 or else Nkind (Unit (N)) = N_Package_Body
4063 Id := Entity (Name (Item));
4065 if Is_Child_Unit (Id)
4066 and then Is_Ancestor_Package (Scope (Id), U_Name)
4068 Set_Is_Immediately_Visible (Id);
4070 -- Check for the presence of another unit in the context that
4071 -- may be inadvertently hidden by the child.
4073 Prev := Current_Entity (Id);
4076 and then Is_Immediately_Visible (Prev)
4077 and then not Is_Child_Unit (Prev)
4083 Clause := First (Context_Items (N));
4084 while Present (Clause) loop
4085 if Nkind (Clause) = N_With_Clause
4086 and then Entity (Name (Clause)) = Prev
4089 ("child unit& hides compilation unit " &
4090 "with the same name?",
4100 -- The With_Clause may be on a grand-child or one of its further
4101 -- descendants, which makes a child immediately visible. Examine
4102 -- ancestry to determine whether such a child exists. For example,
4103 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
4104 -- is immediately visible.
4106 elsif Is_Child_Unit (Id) then
4112 while Is_Child_Unit (Par) loop
4113 if Is_Ancestor_Package (Scope (Par), U_Name) then
4114 Set_Is_Immediately_Visible (Par);
4123 -- If the item is a private with-clause on a child unit, the parent
4124 -- may have been installed already, but the child unit must remain
4125 -- invisible until installed in a private part or body, unless there
4126 -- is already a regular with_clause for it in the current unit.
4128 elsif Private_Present (Item) then
4129 Id := Entity (Name (Item));
4131 if Is_Child_Unit (Id) then
4135 function In_Context return Boolean;
4136 -- Scan context of current unit, to check whether there is
4137 -- a with_clause on the same unit as a private with-clause
4138 -- on a parent, in which case child unit is visible. If the
4139 -- unit is a grand-child, the same applies to its parent.
4145 function In_Context return Boolean is
4148 First (Context_Items (Cunit (Current_Sem_Unit)));
4149 while Present (Clause) loop
4150 if Nkind (Clause) = N_With_Clause
4151 and then Comes_From_Source (Clause)
4152 and then Is_Entity_Name (Name (Clause))
4153 and then not Private_Present (Clause)
4155 if Entity (Name (Clause)) = Id
4157 (Nkind (Name (Clause)) = N_Expanded_Name
4158 and then Entity (Prefix (Name (Clause))) = Id)
4171 Set_Is_Visible_Child_Unit (Id, In_Context);
4178 end Install_Siblings;
4180 ---------------------------------
4181 -- Install_Limited_Withed_Unit --
4182 ---------------------------------
4184 procedure Install_Limited_Withed_Unit (N : Node_Id) is
4185 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
4188 Is_Child_Package : Boolean := False;
4189 Lim_Header : Entity_Id;
4190 Lim_Typ : Entity_Id;
4192 procedure Check_Body_Required;
4193 -- A unit mentioned in a limited with_clause may not be mentioned in
4194 -- a regular with_clause, but must still be included in the current
4195 -- partition. We need to determine whether the unit needs a body, so
4196 -- that the binder can determine the name of the file to be compiled.
4197 -- Checking whether a unit needs a body can be done without semantic
4198 -- analysis, by examining the nature of the declarations in the package.
4200 function Has_Limited_With_Clause
4201 (C_Unit : Entity_Id;
4202 Pack : Entity_Id) return Boolean;
4203 -- Determine whether any package in the ancestor chain starting with
4204 -- C_Unit has a limited with clause for package Pack.
4206 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
4207 -- Check if some package installed though normal with-clauses has a
4208 -- renaming declaration of package P. AARM 10.1.2(21/2).
4210 -------------------------
4211 -- Check_Body_Required --
4212 -------------------------
4214 procedure Check_Body_Required is
4215 PA : constant List_Id :=
4216 Pragmas_After (Aux_Decls_Node (Parent (P_Unit)));
4218 procedure Check_Declarations (Spec : Node_Id);
4219 -- Recursive procedure that does the work and checks nested packages
4221 ------------------------
4222 -- Check_Declarations --
4223 ------------------------
4225 procedure Check_Declarations (Spec : Node_Id) is
4227 Incomplete_Decls : constant Elist_Id := New_Elmt_List;
4229 Subp_List : constant Elist_Id := New_Elmt_List;
4231 procedure Check_Pragma_Import (P : Node_Id);
4232 -- If a pragma import applies to a previous subprogram, the
4233 -- enclosing unit may not need a body. The processing is syntactic
4234 -- and does not require a declaration to be analyzed. The code
4235 -- below also handles pragma Import when applied to a subprogram
4236 -- that renames another. In this case the pragma applies to the
4239 -- Chains of multiple renames are not handled by the code below.
4240 -- It is probably impossible to handle all cases without proper
4241 -- name resolution. In such cases the algorithm is conservative
4242 -- and will indicate that a body is needed???
4244 -------------------------
4245 -- Check_Pragma_Import --
4246 -------------------------
4248 procedure Check_Pragma_Import (P : Node_Id) is
4254 procedure Remove_Homonyms (E : Node_Id);
4255 -- Make one pass over list of subprograms. Called again if
4256 -- subprogram is a renaming. E is known to be an identifier.
4258 ---------------------
4259 -- Remove_Homonyms --
4260 ---------------------
4262 procedure Remove_Homonyms (E : Node_Id) is
4263 R : Entity_Id := Empty;
4264 -- Name of renamed entity, if any
4267 Subp_Id := First_Elmt (Subp_List);
4268 while Present (Subp_Id) loop
4269 if Chars (Node (Subp_Id)) = Chars (E) then
4270 if Nkind (Parent (Parent (Node (Subp_Id))))
4271 /= N_Subprogram_Renaming_Declaration
4274 Next_Elmt (Subp_Id);
4275 Remove_Elmt (Subp_List, Prev_Id);
4277 R := Name (Parent (Parent (Node (Subp_Id))));
4281 Next_Elmt (Subp_Id);
4286 if Nkind (R) = N_Identifier then
4287 Remove_Homonyms (R);
4289 elsif Nkind (R) = N_Selected_Component then
4290 Remove_Homonyms (Selector_Name (R));
4292 -- Renaming of attribute
4298 end Remove_Homonyms;
4300 -- Start of processing for Check_Pragma_Import
4303 -- Find name of entity in Import pragma. We have not analyzed
4304 -- the construct, so we must guard against syntax errors.
4306 Arg := Next (First (Pragma_Argument_Associations (P)));
4309 or else Nkind (Expression (Arg)) /= N_Identifier
4313 Imported := Expression (Arg);
4316 Remove_Homonyms (Imported);
4317 end Check_Pragma_Import;
4319 -- Start of processing for Check_Declarations
4322 -- Search for Elaborate Body pragma
4324 Decl := First (Visible_Declarations (Spec));
4325 while Present (Decl)
4326 and then Nkind (Decl) = N_Pragma
4328 if Get_Pragma_Id (Decl) = Pragma_Elaborate_Body then
4329 Set_Body_Required (Library_Unit (N));
4336 -- Look for declarations that require the presence of a body. We
4337 -- have already skipped pragmas at the start of the list.
4339 while Present (Decl) loop
4341 -- Subprogram that comes from source means body may be needed.
4342 -- Save for subsequent examination of import pragmas.
4344 if Comes_From_Source (Decl)
4345 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4346 N_Subprogram_Renaming_Declaration,
4347 N_Generic_Subprogram_Declaration))
4349 Append_Elmt (Defining_Entity (Decl), Subp_List);
4351 -- Package declaration of generic package declaration. We need
4352 -- to recursively examine nested declarations.
4354 elsif Nkind_In (Decl, N_Package_Declaration,
4355 N_Generic_Package_Declaration)
4357 Check_Declarations (Specification (Decl));
4359 elsif Nkind (Decl) = N_Pragma
4360 and then Pragma_Name (Decl) = Name_Import
4362 Check_Pragma_Import (Decl);
4368 -- Same set of tests for private part. In addition to subprograms
4369 -- detect the presence of Taft Amendment types (incomplete types
4370 -- completed in the body).
4372 Decl := First (Private_Declarations (Spec));
4373 while Present (Decl) loop
4374 if Comes_From_Source (Decl)
4375 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4376 N_Subprogram_Renaming_Declaration,
4377 N_Generic_Subprogram_Declaration))
4379 Append_Elmt (Defining_Entity (Decl), Subp_List);
4381 elsif Nkind_In (Decl, N_Package_Declaration,
4382 N_Generic_Package_Declaration)
4384 Check_Declarations (Specification (Decl));
4386 -- Collect incomplete type declarations for separate pass
4388 elsif Nkind (Decl) = N_Incomplete_Type_Declaration then
4389 Append_Elmt (Decl, Incomplete_Decls);
4391 elsif Nkind (Decl) = N_Pragma
4392 and then Pragma_Name (Decl) = Name_Import
4394 Check_Pragma_Import (Decl);
4400 -- Now check incomplete declarations to locate Taft amendment
4401 -- types. This can be done by examining the defining identifiers
4402 -- of type declarations without real semantic analysis.
4408 Inc := First_Elmt (Incomplete_Decls);
4409 while Present (Inc) loop
4410 Decl := Next (Node (Inc));
4411 while Present (Decl) loop
4412 if Nkind (Decl) = N_Full_Type_Declaration
4413 and then Chars (Defining_Identifier (Decl)) =
4414 Chars (Defining_Identifier (Node (Inc)))
4422 -- If no completion, this is a TAT, and a body is needed
4425 Set_Body_Required (Library_Unit (N));
4433 -- Finally, check whether there are subprograms that still require
4434 -- a body, i.e. are not renamings or null.
4436 if not Is_Empty_Elmt_List (Subp_List) then
4442 Subp_Id := First_Elmt (Subp_List);
4443 Spec := Parent (Node (Subp_Id));
4445 while Present (Subp_Id) loop
4446 if Nkind (Parent (Spec))
4447 = N_Subprogram_Renaming_Declaration
4451 elsif Nkind (Spec) = N_Procedure_Specification
4452 and then Null_Present (Spec)
4457 Set_Body_Required (Library_Unit (N));
4461 Next_Elmt (Subp_Id);
4465 end Check_Declarations;
4467 -- Start of processing for Check_Body_Required
4470 -- If this is an imported package (Java and CIL usage) no body is
4471 -- needed. Scan list of pragmas that may follow a compilation unit
4472 -- to look for a relevant pragma Import.
4474 if Present (PA) then
4480 while Present (Prag) loop
4481 if Nkind (Prag) = N_Pragma
4482 and then Get_Pragma_Id (Prag) = Pragma_Import
4492 Check_Declarations (Specification (P_Unit));
4493 end Check_Body_Required;
4495 -----------------------------
4496 -- Has_Limited_With_Clause --
4497 -----------------------------
4499 function Has_Limited_With_Clause
4500 (C_Unit : Entity_Id;
4501 Pack : Entity_Id) return Boolean
4508 while Present (Par) loop
4509 if Ekind (Par) /= E_Package then
4513 -- Retrieve the Compilation_Unit node for Par and determine if
4514 -- its context clauses contain a limited with for Pack.
4516 Par_Unit := Parent (Parent (Parent (Par)));
4518 if Nkind (Par_Unit) = N_Package_Declaration then
4519 Par_Unit := Parent (Par_Unit);
4522 if Has_With_Clause (Par_Unit, Pack, True) then
4526 -- If there are more ancestors, climb up the tree, otherwise we
4529 if Is_Child_Unit (Par) then
4537 end Has_Limited_With_Clause;
4539 ----------------------------------
4540 -- Is_Visible_Through_Renamings --
4541 ----------------------------------
4543 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4544 Kind : constant Node_Kind :=
4545 Nkind (Unit (Cunit (Current_Sem_Unit)));
4551 -- Example of the error detected by this subprogram:
4559 -- package Ren_P renames P;
4565 -- limited with P; -- ERROR
4566 -- package R.C is ...
4568 Aux_Unit := Cunit (Current_Sem_Unit);
4571 Item := First (Context_Items (Aux_Unit));
4572 while Present (Item) loop
4573 if Nkind (Item) = N_With_Clause
4574 and then not Limited_Present (Item)
4575 and then Nkind (Unit (Library_Unit (Item))) =
4576 N_Package_Declaration
4579 First (Visible_Declarations
4580 (Specification (Unit (Library_Unit (Item)))));
4581 while Present (Decl) loop
4582 if Nkind (Decl) = N_Package_Renaming_Declaration
4583 and then Entity (Name (Decl)) = P
4585 -- Generate the error message only if the current unit
4586 -- is a package declaration; in case of subprogram
4587 -- bodies and package bodies we just return True to
4588 -- indicate that the limited view must not be
4591 if Kind = N_Package_Declaration then
4593 ("simultaneous visibility of the limited and " &
4594 "unlimited views not allowed", N);
4595 Error_Msg_Sloc := Sloc (Item);
4597 ("\\ unlimited view of & visible through the " &
4598 "context clause #", N, P);
4599 Error_Msg_Sloc := Sloc (Decl);
4600 Error_Msg_NE ("\\ and the renaming #", N, P);
4613 -- If it is a body not acting as spec, follow pointer to the
4614 -- corresponding spec, otherwise follow pointer to parent spec.
4616 if Present (Library_Unit (Aux_Unit))
4617 and then Nkind_In (Unit (Aux_Unit),
4618 N_Package_Body, N_Subprogram_Body)
4620 if Aux_Unit = Library_Unit (Aux_Unit) then
4622 -- Aux_Unit is a body that acts as a spec. Clause has
4623 -- already been flagged as illegal.
4628 Aux_Unit := Library_Unit (Aux_Unit);
4632 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4635 exit when No (Aux_Unit);
4639 end Is_Visible_Through_Renamings;
4641 -- Start of processing for Install_Limited_Withed_Unit
4644 pragma Assert (not Limited_View_Installed (N));
4646 -- In case of limited with_clause on subprograms, generics, instances,
4647 -- or renamings, the corresponding error was previously posted and we
4648 -- have nothing to do here. If the file is missing altogether, it has
4649 -- no source location.
4651 if Nkind (P_Unit) /= N_Package_Declaration
4652 or else Sloc (P_Unit) = No_Location
4657 P := Defining_Unit_Name (Specification (P_Unit));
4659 -- Handle child packages
4661 if Nkind (P) = N_Defining_Program_Unit_Name then
4662 Is_Child_Package := True;
4663 P := Defining_Identifier (P);
4666 -- Do not install the limited-view if the context of the unit is already
4667 -- available through a regular with clause.
4669 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4670 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4675 -- Do not install the limited-view if the full-view is already visible
4676 -- through renaming declarations.
4678 if Is_Visible_Through_Renamings (P) then
4682 -- Do not install the limited view if this is the unit being analyzed.
4683 -- This unusual case will happen when a unit has a limited_with clause
4684 -- on one of its children. The compilation of the child forces the load
4685 -- of the parent which tries to install the limited view of the child
4686 -- again. Installing the limited view must also be disabled when
4687 -- compiling the body of the child unit.
4689 if P = Cunit_Entity (Current_Sem_Unit)
4691 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4692 and then P = Main_Unit_Entity)
4697 -- This scenario is similar to the one above, the difference is that the
4698 -- compilation of sibling Par.Sib forces the load of parent Par which
4699 -- tries to install the limited view of Lim_Pack [1]. However Par.Sib
4700 -- has a with clause for Lim_Pack [2] in its body, and thus needs the
4701 -- non-limited views of all entities from Lim_Pack.
4703 -- limited with Lim_Pack; -- [1]
4704 -- package Par is ... package Lim_Pack is ...
4706 -- with Lim_Pack; -- [2]
4707 -- package Par.Sib is ... package body Par.Sib is ...
4709 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4710 -- Sem_Unit is the body of Par.Sib.
4712 if Ekind (P) = E_Package
4713 and then Ekind (Main_Unit_Entity) = E_Package
4714 and then Is_Child_Unit (Main_Unit_Entity)
4716 -- The body has a regular with clause
4718 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4719 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4721 -- One of the ancestors has a limited with clause
4723 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4724 N_Package_Specification
4725 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4730 -- A common use of the limited-with is to have a limited-with in the
4731 -- package spec, and a normal with in its package body. For example:
4733 -- limited with X; -- [1]
4737 -- package body A is ...
4739 -- The compilation of A's body installs the context clauses found at [2]
4740 -- and then the context clauses of its specification (found at [1]). As
4741 -- a consequence, at [1] the specification of X has been analyzed and it
4742 -- is immediately visible. According to the semantics of limited-with
4743 -- context clauses we don't install the limited view because the full
4744 -- view of X supersedes its limited view.
4746 if Analyzed (P_Unit)
4748 (Is_Immediately_Visible (P)
4749 or else (Is_Child_Package and then Is_Visible_Child_Unit (P)))
4752 -- The presence of both the limited and the analyzed nonlimited view
4753 -- may also be an error, such as an illegal context for a limited
4754 -- with_clause. In that case, do not process the context item at all.
4756 if Error_Posted (N) then
4760 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body then
4764 Item := First (Context_Items (Cunit (Current_Sem_Unit)));
4765 while Present (Item) loop
4766 if Nkind (Item) = N_With_Clause
4767 and then Comes_From_Source (Item)
4768 and then Entity (Name (Item)) = P
4777 -- If this is a child body, assume that the nonlimited with_clause
4778 -- appears in an ancestor. Could be refined ???
4782 (Unit (Library_Unit (Cunit (Current_Sem_Unit)))))
4789 -- If in package declaration, nonlimited view brought in from
4790 -- parent unit or some error condition.
4796 if Debug_Flag_I then
4797 Write_Str ("install limited view of ");
4798 Write_Name (Chars (P));
4802 -- If the unit has not been analyzed and the limited view has not been
4803 -- already installed then we install it.
4805 if not Analyzed (P_Unit) then
4806 if not In_Chain (P) then
4808 -- Minimum decoration
4810 Set_Ekind (P, E_Package);
4811 Set_Etype (P, Standard_Void_Type);
4812 Set_Scope (P, Standard_Standard);
4814 if Is_Child_Package then
4815 Set_Is_Child_Unit (P);
4816 Set_Is_Visible_Child_Unit (P);
4817 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4820 -- Place entity on visibility structure
4822 Set_Homonym (P, Current_Entity (P));
4823 Set_Current_Entity (P);
4825 if Debug_Flag_I then
4826 Write_Str (" (homonym) chain ");
4827 Write_Name (Chars (P));
4831 -- Install the incomplete view. The first element of the limited
4832 -- view is a header (an E_Package entity) used to reference the
4833 -- first shadow entity in the private part of the package.
4835 Lim_Header := Limited_View (P);
4836 Lim_Typ := First_Entity (Lim_Header);
4838 while Present (Lim_Typ)
4839 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4841 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4842 Set_Current_Entity (Lim_Typ);
4844 if Debug_Flag_I then
4845 Write_Str (" (homonym) chain ");
4846 Write_Name (Chars (Lim_Typ));
4850 Next_Entity (Lim_Typ);
4854 -- If the unit appears in a previous regular with_clause, the regular
4855 -- entities of the public part of the withed package must be replaced
4856 -- by the shadow ones.
4858 -- This code must be kept synchronized with the code that replaces the
4859 -- shadow entities by the real entities (see body of Remove_Limited
4860 -- With_Clause); otherwise the contents of the homonym chains are not
4864 -- Hide all the type entities of the public part of the package to
4865 -- avoid its usage. This is needed to cover all the subtype decla-
4866 -- rations because we do not remove them from the homonym chain.
4868 E := First_Entity (P);
4869 while Present (E) and then E /= First_Private_Entity (P) loop
4871 Set_Was_Hidden (E, Is_Hidden (E));
4878 -- Replace the real entities by the shadow entities of the limited
4879 -- view. The first element of the limited view is a header that is
4880 -- used to reference the first shadow entity in the private part
4881 -- of the package. Successive elements are the limited views of the
4882 -- type (including regular incomplete types) declared in the package.
4884 Lim_Header := Limited_View (P);
4886 Lim_Typ := First_Entity (Lim_Header);
4887 while Present (Lim_Typ)
4888 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4890 pragma Assert (not In_Chain (Lim_Typ));
4892 -- Do not unchain nested packages and child units
4894 if Ekind (Lim_Typ) /= E_Package
4895 and then not Is_Child_Unit (Lim_Typ)
4901 Prev := Current_Entity (Lim_Typ);
4904 -- Replace E in the homonyms list, so that the limited view
4905 -- becomes available.
4907 if E = Non_Limited_View (Lim_Typ) then
4908 Set_Homonym (Lim_Typ, Homonym (Prev));
4909 Set_Current_Entity (Lim_Typ);
4913 E := Homonym (Prev);
4915 -- E may have been removed when installing a previous
4916 -- limited_with_clause.
4920 exit when E = Non_Limited_View (Lim_Typ);
4922 Prev := Homonym (Prev);
4926 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4927 Set_Homonym (Prev, Lim_Typ);
4932 if Debug_Flag_I then
4933 Write_Str (" (homonym) chain ");
4934 Write_Name (Chars (Lim_Typ));
4939 Next_Entity (Lim_Typ);
4943 -- The package must be visible while the limited-with clause is active
4944 -- because references to the type P.T must resolve in the usual way.
4945 -- In addition, we remember that the limited-view has been installed to
4946 -- uninstall it at the point of context removal.
4948 Set_Is_Immediately_Visible (P);
4949 Set_Limited_View_Installed (N);
4951 -- If unit has not been analyzed in some previous context, check
4952 -- (imperfectly ???) whether it might need a body.
4954 if not Analyzed (P_Unit) then
4955 Check_Body_Required;
4958 -- If the package in the limited_with clause is a child unit, the clause
4959 -- is unanalyzed and appears as a selected component. Recast it as an
4960 -- expanded name so that the entity can be properly set. Use entity of
4961 -- parent, if available, for higher ancestors in the name.
4963 if Nkind (Name (N)) = N_Selected_Component then
4971 while Nkind (Nam) = N_Selected_Component
4972 and then Present (Ent)
4974 Change_Selected_Component_To_Expanded_Name (Nam);
4976 -- Set entity of parent identifiers if the unit is a child
4977 -- unit. This ensures that the tree is properly formed from
4978 -- semantic point of view (e.g. for ASIS queries).
4980 Set_Entity (Nam, Ent);
4982 Nam := Prefix (Nam);
4985 -- Set entity of last ancestor
4987 if Nkind (Nam) = N_Identifier then
4988 Set_Entity (Nam, Ent);
4994 Set_Entity (Name (N), P);
4995 Set_From_With_Type (P);
4996 end Install_Limited_Withed_Unit;
4998 -------------------------
4999 -- Install_Withed_Unit --
5000 -------------------------
5002 procedure Install_Withed_Unit
5003 (With_Clause : Node_Id;
5004 Private_With_OK : Boolean := False)
5006 Uname : constant Entity_Id := Entity (Name (With_Clause));
5007 P : constant Entity_Id := Scope (Uname);
5010 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
5011 -- compiling a package declaration and the Private_With_OK flag was not
5012 -- set by the caller. These declarations will be installed later (before
5013 -- analyzing the private part of the package).
5015 if Private_Present (With_Clause)
5016 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
5017 and then not (Private_With_OK)
5022 if Debug_Flag_I then
5023 if Private_Present (With_Clause) then
5024 Write_Str ("install private withed unit ");
5026 Write_Str ("install withed unit ");
5029 Write_Name (Chars (Uname));
5033 -- We do not apply the restrictions to an internal unit unless we are
5034 -- compiling the internal unit as a main unit. This check is also
5035 -- skipped for dummy units (for missing packages).
5037 if Sloc (Uname) /= No_Location
5038 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
5039 or else Current_Sem_Unit = Main_Unit)
5041 Check_Restricted_Unit
5042 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
5045 if P /= Standard_Standard then
5047 -- If the unit is not analyzed after analysis of the with clause and
5048 -- it is an instantiation then it awaits a body and is the main unit.
5049 -- Its appearance in the context of some other unit indicates a
5050 -- circular dependency (DEC suite perversity).
5052 if not Analyzed (Uname)
5053 and then Nkind (Parent (Uname)) = N_Package_Instantiation
5056 ("instantiation depends on itself", Name (With_Clause));
5058 elsif not Is_Visible_Child_Unit (Uname) then
5060 -- Abandon processing in case of previous errors
5062 if No (Scope (Uname)) then
5063 pragma Assert (Serious_Errors_Detected /= 0);
5067 Set_Is_Visible_Child_Unit (Uname);
5069 -- If the child unit appears in the context of its parent, it is
5070 -- immediately visible.
5072 if In_Open_Scopes (Scope (Uname)) then
5073 Set_Is_Immediately_Visible (Uname);
5076 if Is_Generic_Instance (Uname)
5077 and then Ekind (Uname) in Subprogram_Kind
5079 -- Set flag as well on the visible entity that denotes the
5080 -- instance, which renames the current one.
5082 Set_Is_Visible_Child_Unit
5084 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
5087 -- The parent unit may have been installed already, and may have
5088 -- appeared in a use clause.
5090 if In_Use (Scope (Uname)) then
5091 Set_Is_Potentially_Use_Visible (Uname);
5094 Set_Context_Installed (With_Clause);
5097 elsif not Is_Immediately_Visible (Uname) then
5098 if not Private_Present (With_Clause)
5099 or else Private_With_OK
5101 Set_Is_Immediately_Visible (Uname);
5104 Set_Context_Installed (With_Clause);
5107 -- A with-clause overrides a with-type clause: there are no restric-
5108 -- tions on the use of package entities.
5110 if Ekind (Uname) = E_Package then
5111 Set_From_With_Type (Uname, False);
5114 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
5115 -- unit if there is a visible homograph for it declared in the same
5116 -- declarative region. This pathological case can only arise when an
5117 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
5118 -- G1 has a generic child also named G2, and the context includes with_
5119 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
5120 -- of I1.G2 visible as well. If the child unit is named Standard, do
5121 -- not apply the check to the Standard package itself.
5123 if Is_Child_Unit (Uname)
5124 and then Is_Visible_Child_Unit (Uname)
5125 and then Ada_Version >= Ada_2005
5128 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
5134 U2 := Homonym (Uname);
5136 and then U2 /= Standard_Standard
5139 Decl2 := Unit_Declaration_Node (P2);
5141 if Is_Child_Unit (U2)
5142 and then Is_Visible_Child_Unit (U2)
5144 if Is_Generic_Instance (P)
5145 and then Nkind (Decl1) = N_Package_Declaration
5146 and then Generic_Parent (Specification (Decl1)) = P2
5148 Error_Msg_N ("illegal with_clause", With_Clause);
5150 ("\child unit has visible homograph" &
5151 " (RM 8.3(26), 10.1.1(19))",
5155 elsif Is_Generic_Instance (P2)
5156 and then Nkind (Decl2) = N_Package_Declaration
5157 and then Generic_Parent (Specification (Decl2)) = P
5159 -- With_clause for child unit of instance appears before
5160 -- in the context. We want to place the error message on
5161 -- it, not on the generic child unit itself.
5164 Prev_Clause : Node_Id;
5167 Prev_Clause := First (List_Containing (With_Clause));
5168 while Entity (Name (Prev_Clause)) /= U2 loop
5172 pragma Assert (Present (Prev_Clause));
5173 Error_Msg_N ("illegal with_clause", Prev_Clause);
5175 ("\child unit has visible homograph" &
5176 " (RM 8.3(26), 10.1.1(19))",
5187 end Install_Withed_Unit;
5193 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
5194 K : constant Node_Kind := Nkind (Lib_Unit);
5197 return (K in N_Generic_Declaration or else
5198 K in N_Generic_Instantiation or else
5199 K in N_Generic_Renaming_Declaration or else
5200 K = N_Package_Declaration or else
5201 K = N_Package_Renaming_Declaration or else
5202 K = N_Subprogram_Declaration or else
5203 K = N_Subprogram_Renaming_Declaration)
5204 and then Present (Parent_Spec (Lib_Unit));
5207 ------------------------------------
5208 -- Is_Legal_Shadow_Entity_In_Body --
5209 ------------------------------------
5211 function Is_Legal_Shadow_Entity_In_Body (T : Entity_Id) return Boolean is
5212 C_Unit : constant Node_Id := Cunit (Current_Sem_Unit);
5214 return Nkind (Unit (C_Unit)) = N_Package_Body
5217 (C_Unit, Cunit_Entity (Get_Source_Unit (Non_Limited_View (T))));
5218 end Is_Legal_Shadow_Entity_In_Body;
5220 -----------------------
5221 -- Load_Needed_Body --
5222 -----------------------
5224 -- N is a generic unit named in a with clause, or else it is a unit that
5225 -- contains a generic unit or an inlined function. In order to perform an
5226 -- instantiation, the body of the unit must be present. If the unit itself
5227 -- is generic, we assume that an instantiation follows, and load & analyze
5228 -- the body unconditionally. This forces analysis of the spec as well.
5230 -- If the unit is not generic, but contains a generic unit, it is loaded on
5231 -- demand, at the point of instantiation (see ch12).
5233 procedure Load_Needed_Body
5236 Do_Analyze : Boolean := True)
5238 Body_Name : Unit_Name_Type;
5239 Unum : Unit_Number_Type;
5241 Save_Style_Check : constant Boolean := Opt.Style_Check;
5242 -- The loading and analysis is done with style checks off
5245 if not GNAT_Mode then
5246 Style_Check := False;
5249 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
5252 (Load_Name => Body_Name,
5258 if Unum = No_Unit then
5262 Compiler_State := Analyzing; -- reset after load
5264 if not Fatal_Error (Unum) or else Try_Semantics then
5265 if Debug_Flag_L then
5266 Write_Str ("*** Loaded generic body");
5271 Semantics (Cunit (Unum));
5278 Style_Check := Save_Style_Check;
5279 end Load_Needed_Body;
5281 -------------------------
5282 -- Build_Limited_Views --
5283 -------------------------
5285 procedure Build_Limited_Views (N : Node_Id) is
5286 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
5287 P : constant Entity_Id := Cunit_Entity (Unum);
5289 Spec : Node_Id; -- To denote a package specification
5290 Lim_Typ : Entity_Id; -- To denote shadow entities
5291 Comp_Typ : Entity_Id; -- To denote real entities
5293 Lim_Header : Entity_Id; -- Package entity
5294 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
5295 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
5297 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id);
5298 -- Add attributes of an incomplete type to a shadow entity. The same
5299 -- attributes are placed on the real entity, so that gigi receives
5300 -- a consistent view.
5302 procedure Decorate_Package_Specification (P : Entity_Id);
5303 -- Add attributes of a package entity to the entity in a package
5306 procedure Decorate_Tagged_Type
5310 Mark : Boolean := False);
5311 -- Set basic attributes of tagged type T, including its class-wide type.
5312 -- The parameters Loc, Scope are used to decorate the class-wide type.
5313 -- Use flag Mark to label the class-wide type as Materialize_Entity.
5315 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id);
5316 -- Construct list of shadow entities and attach it to entity of
5317 -- package that is mentioned in a limited_with clause.
5319 function New_Internal_Shadow_Entity
5320 (Kind : Entity_Kind;
5321 Sloc_Value : Source_Ptr;
5322 Id_Char : Character) return Entity_Id;
5323 -- Build a new internal entity and append it to the list of shadow
5324 -- entities available through the limited-header
5330 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id) is
5331 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
5332 Is_Tagged : Boolean;
5337 while Present (Decl) loop
5339 -- For each library_package_declaration in the environment, there
5340 -- is an implicit declaration of a *limited view* of that library
5341 -- package. The limited view of a package contains:
5343 -- * For each nested package_declaration, a declaration of the
5344 -- limited view of that package, with the same defining-
5345 -- program-unit name.
5347 -- * For each type_declaration in the visible part, an incomplete
5348 -- type-declaration with the same defining_identifier, whose
5349 -- completion is the type_declaration. If the type_declaration
5350 -- is tagged, then the incomplete_type_declaration is tagged
5353 -- The partial view is tagged if the declaration has the
5354 -- explicit keyword, or else if it is a type extension, both
5355 -- of which can be ascertained syntactically.
5357 if Nkind (Decl) = N_Full_Type_Declaration then
5359 (Nkind (Type_Definition (Decl)) = N_Record_Definition
5360 and then Tagged_Present (Type_Definition (Decl)))
5362 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
5365 (Record_Extension_Part (Type_Definition (Decl))));
5367 Comp_Typ := Defining_Identifier (Decl);
5369 if not Analyzed_Unit then
5371 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5373 Decorate_Incomplete_Type (Comp_Typ, Scope);
5377 -- Create shadow entity for type
5380 New_Internal_Shadow_Entity
5381 (Kind => Ekind (Comp_Typ),
5382 Sloc_Value => Sloc (Comp_Typ),
5385 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5386 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5387 Set_From_With_Type (Lim_Typ);
5390 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5392 Decorate_Incomplete_Type (Lim_Typ, Scope);
5395 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5397 elsif Nkind_In (Decl, N_Private_Type_Declaration,
5398 N_Incomplete_Type_Declaration,
5399 N_Task_Type_Declaration,
5400 N_Protected_Type_Declaration)
5402 Comp_Typ := Defining_Identifier (Decl);
5405 Nkind_In (Decl, N_Private_Type_Declaration,
5406 N_Incomplete_Type_Declaration)
5407 and then Tagged_Present (Decl);
5409 if not Analyzed_Unit then
5411 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5413 Decorate_Incomplete_Type (Comp_Typ, Scope);
5418 New_Internal_Shadow_Entity
5419 (Kind => Ekind (Comp_Typ),
5420 Sloc_Value => Sloc (Comp_Typ),
5423 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5424 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5425 Set_From_With_Type (Lim_Typ);
5428 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5430 Decorate_Incomplete_Type (Lim_Typ, Scope);
5433 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5435 elsif Nkind (Decl) = N_Private_Extension_Declaration then
5436 Comp_Typ := Defining_Identifier (Decl);
5438 if not Analyzed_Unit then
5439 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5442 -- Create shadow entity for type
5445 New_Internal_Shadow_Entity
5446 (Kind => Ekind (Comp_Typ),
5447 Sloc_Value => Sloc (Comp_Typ),
5450 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5451 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5452 Set_From_With_Type (Lim_Typ);
5454 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5455 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5457 elsif Nkind (Decl) = N_Package_Declaration then
5462 Spec : constant Node_Id := Specification (Decl);
5465 Comp_Typ := Defining_Unit_Name (Spec);
5467 if not Analyzed (Cunit (Unum)) then
5468 Decorate_Package_Specification (Comp_Typ);
5469 Set_Scope (Comp_Typ, Scope);
5473 New_Internal_Shadow_Entity
5474 (Kind => Ekind (Comp_Typ),
5475 Sloc_Value => Sloc (Comp_Typ),
5478 Decorate_Package_Specification (Lim_Typ);
5479 Set_Scope (Lim_Typ, Scope);
5481 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5482 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5483 Set_From_With_Type (Lim_Typ);
5485 -- Note: The non_limited_view attribute is not used
5486 -- for local packages.
5490 First_Decl => First (Visible_Declarations (Spec)));
5498 ------------------------------
5499 -- Decorate_Incomplete_Type --
5500 ------------------------------
5502 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id) is
5504 Set_Ekind (E, E_Incomplete_Type);
5505 Set_Scope (E, Scop);
5507 Set_Is_First_Subtype (E, True);
5508 Set_Stored_Constraint (E, No_Elist);
5509 Set_Full_View (E, Empty);
5510 Init_Size_Align (E);
5511 end Decorate_Incomplete_Type;
5513 --------------------------
5514 -- Decorate_Tagged_Type --
5515 --------------------------
5517 procedure Decorate_Tagged_Type
5521 Mark : Boolean := False)
5526 Decorate_Incomplete_Type (T, Scop);
5527 Set_Is_Tagged_Type (T);
5529 -- Build corresponding class_wide type, if not previously done
5531 -- Note: The class-wide entity is shared by the limited-view
5532 -- and the full-view.
5534 if No (Class_Wide_Type (T)) then
5535 CW := New_External_Entity (E_Void, Scope (T), Loc, T, 'C', 0, 'T');
5537 -- Set parent to be the same as the parent of the tagged type.
5538 -- We need a parent field set, and it is supposed to point to
5539 -- the declaration of the type. The tagged type declaration
5540 -- essentially declares two separate types, the tagged type
5541 -- itself and the corresponding class-wide type, so it is
5542 -- reasonable for the parent fields to point to the declaration
5545 Set_Parent (CW, Parent (T));
5547 -- Set remaining fields of classwide type
5549 Set_Ekind (CW, E_Class_Wide_Type);
5551 Set_Scope (CW, Scop);
5552 Set_Is_Tagged_Type (CW);
5553 Set_Is_First_Subtype (CW, True);
5554 Init_Size_Align (CW);
5555 Set_Has_Unknown_Discriminants (CW, True);
5556 Set_Class_Wide_Type (CW, CW);
5557 Set_Equivalent_Type (CW, Empty);
5558 Set_From_With_Type (CW, From_With_Type (T));
5559 Set_Materialize_Entity (CW, Mark);
5561 -- Link type to its class-wide type
5563 Set_Class_Wide_Type (T, CW);
5565 end Decorate_Tagged_Type;
5567 ------------------------------------
5568 -- Decorate_Package_Specification --
5569 ------------------------------------
5571 procedure Decorate_Package_Specification (P : Entity_Id) is
5573 -- Place only the most basic attributes
5575 Set_Ekind (P, E_Package);
5576 Set_Etype (P, Standard_Void_Type);
5577 end Decorate_Package_Specification;
5579 --------------------------------
5580 -- New_Internal_Shadow_Entity --
5581 --------------------------------
5583 function New_Internal_Shadow_Entity
5584 (Kind : Entity_Kind;
5585 Sloc_Value : Source_Ptr;
5586 Id_Char : Character) return Entity_Id
5588 E : constant Entity_Id := Make_Temporary (Sloc_Value, Id_Char);
5591 Set_Ekind (E, Kind);
5592 Set_Is_Internal (E, True);
5594 if Kind in Type_Kind then
5595 Init_Size_Align (E);
5598 Append_Entity (E, Lim_Header);
5601 end New_Internal_Shadow_Entity;
5603 -- Start of processing for Build_Limited_Views
5606 pragma Assert (Limited_Present (N));
5608 -- A library_item mentioned in a limited_with_clause is a package
5609 -- declaration, not a subprogram declaration, generic declaration,
5610 -- generic instantiation, or package renaming declaration.
5612 case Nkind (Unit (Library_Unit (N))) is
5613 when N_Package_Declaration =>
5616 when N_Subprogram_Declaration =>
5617 Error_Msg_N ("subprograms not allowed in "
5618 & "limited with_clauses", N);
5621 when N_Generic_Package_Declaration |
5622 N_Generic_Subprogram_Declaration =>
5623 Error_Msg_N ("generics not allowed in "
5624 & "limited with_clauses", N);
5627 when N_Generic_Instantiation =>
5628 Error_Msg_N ("generic instantiations not allowed in "
5629 & "limited with_clauses", N);
5632 when N_Generic_Renaming_Declaration =>
5633 Error_Msg_N ("generic renamings not allowed in "
5634 & "limited with_clauses", N);
5637 when N_Subprogram_Renaming_Declaration =>
5638 Error_Msg_N ("renamed subprograms not allowed in "
5639 & "limited with_clauses", N);
5642 when N_Package_Renaming_Declaration =>
5643 Error_Msg_N ("renamed packages not allowed in "
5644 & "limited with_clauses", N);
5648 raise Program_Error;
5651 -- Check if the chain is already built
5653 Spec := Specification (Unit (Library_Unit (N)));
5655 if Limited_View_Installed (Spec) then
5659 Set_Ekind (P, E_Package);
5661 -- Build the header of the limited_view
5663 Lim_Header := Make_Temporary (Sloc (N), 'Z');
5664 Set_Ekind (Lim_Header, E_Package);
5665 Set_Is_Internal (Lim_Header);
5666 Set_Limited_View (P, Lim_Header);
5668 -- Create the auxiliary chain. All the shadow entities are appended to
5669 -- the list of entities of the limited-view header
5673 First_Decl => First (Visible_Declarations (Spec)));
5675 -- Save the last built shadow entity. It is needed later to set the
5676 -- reference to the first shadow entity in the private part
5678 Last_Pub_Lim_E := Last_Lim_E;
5680 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5681 -- Required to give support to limited-private-with clauses
5683 Build_Chain (Scope => P,
5684 First_Decl => First (Private_Declarations (Spec)));
5686 if Last_Pub_Lim_E /= Empty then
5687 Set_First_Private_Entity
5688 (Lim_Header, Next_Entity (Last_Pub_Lim_E));
5690 Set_First_Private_Entity
5691 (Lim_Header, First_Entity (P));
5694 Set_Limited_View_Installed (Spec);
5695 end Build_Limited_Views;
5697 -------------------------------
5698 -- Check_Body_Needed_For_SAL --
5699 -------------------------------
5701 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5703 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5704 -- Determine whether use of entity E might require the presence of its
5705 -- body. For a package this requires a recursive traversal of all nested
5708 ---------------------------
5709 -- Entity_Needed_For_SAL --
5710 ---------------------------
5712 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5716 if Is_Subprogram (E)
5717 and then Has_Pragma_Inline (E)
5721 elsif Ekind_In (E, E_Generic_Function, E_Generic_Procedure) then
5724 elsif Ekind (E) = E_Generic_Package
5726 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5727 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5731 elsif Ekind (E) = E_Package
5732 and then Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5733 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5735 Ent := First_Entity (E);
5736 while Present (Ent) loop
5737 if Entity_Needs_Body (Ent) then
5749 end Entity_Needs_Body;
5751 -- Start of processing for Check_Body_Needed_For_SAL
5754 if Ekind (Unit_Name) = E_Generic_Package
5755 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5756 N_Generic_Package_Declaration
5758 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5760 Set_Body_Needed_For_SAL (Unit_Name);
5762 elsif Ekind_In (Unit_Name, E_Generic_Procedure, E_Generic_Function) then
5763 Set_Body_Needed_For_SAL (Unit_Name);
5765 elsif Is_Subprogram (Unit_Name)
5766 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5767 N_Subprogram_Declaration
5768 and then Has_Pragma_Inline (Unit_Name)
5770 Set_Body_Needed_For_SAL (Unit_Name);
5772 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5773 Check_Body_Needed_For_SAL
5774 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5776 elsif Ekind (Unit_Name) = E_Package
5777 and then Entity_Needs_Body (Unit_Name)
5779 Set_Body_Needed_For_SAL (Unit_Name);
5781 elsif Ekind (Unit_Name) = E_Package_Body
5782 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5784 Check_Body_Needed_For_SAL
5785 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5787 end Check_Body_Needed_For_SAL;
5789 --------------------
5790 -- Remove_Context --
5791 --------------------
5793 procedure Remove_Context (N : Node_Id) is
5794 Lib_Unit : constant Node_Id := Unit (N);
5797 -- If this is a child unit, first remove the parent units
5799 if Is_Child_Spec (Lib_Unit) then
5800 Remove_Parents (Lib_Unit);
5803 Remove_Context_Clauses (N);
5806 ----------------------------
5807 -- Remove_Context_Clauses --
5808 ----------------------------
5810 procedure Remove_Context_Clauses (N : Node_Id) is
5812 Unit_Name : Entity_Id;
5815 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5816 -- limited-views first and regular-views later (to maintain the
5819 -- First Phase: Remove limited_with context clauses
5821 Item := First (Context_Items (N));
5822 while Present (Item) loop
5824 -- We are interested only in with clauses which got installed
5827 if Nkind (Item) = N_With_Clause
5828 and then Limited_Present (Item)
5829 and then Limited_View_Installed (Item)
5831 Remove_Limited_With_Clause (Item);
5837 -- Second Phase: Loop through context items and undo regular
5838 -- with_clauses and use_clauses.
5840 Item := First (Context_Items (N));
5841 while Present (Item) loop
5843 -- We are interested only in with clauses which got installed on
5844 -- entry, as indicated by their Context_Installed flag set
5846 if Nkind (Item) = N_With_Clause
5847 and then Limited_Present (Item)
5848 and then Limited_View_Installed (Item)
5852 elsif Nkind (Item) = N_With_Clause
5853 and then Context_Installed (Item)
5855 -- Remove items from one with'ed unit
5857 Unit_Name := Entity (Name (Item));
5858 Remove_Unit_From_Visibility (Unit_Name);
5859 Set_Context_Installed (Item, False);
5861 elsif Nkind (Item) = N_Use_Package_Clause then
5862 End_Use_Package (Item);
5864 elsif Nkind (Item) = N_Use_Type_Clause then
5865 End_Use_Type (Item);
5870 end Remove_Context_Clauses;
5872 --------------------------------
5873 -- Remove_Limited_With_Clause --
5874 --------------------------------
5876 procedure Remove_Limited_With_Clause (N : Node_Id) is
5877 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5880 Lim_Header : Entity_Id;
5881 Lim_Typ : Entity_Id;
5885 pragma Assert (Limited_View_Installed (N));
5887 -- In case of limited with_clause on subprograms, generics, instances,
5888 -- or renamings, the corresponding error was previously posted and we
5889 -- have nothing to do here.
5891 if Nkind (P_Unit) /= N_Package_Declaration then
5895 P := Defining_Unit_Name (Specification (P_Unit));
5897 -- Handle child packages
5899 if Nkind (P) = N_Defining_Program_Unit_Name then
5900 P := Defining_Identifier (P);
5903 if Debug_Flag_I then
5904 Write_Str ("remove limited view of ");
5905 Write_Name (Chars (P));
5906 Write_Str (" from visibility");
5910 -- Prepare the removal of the shadow entities from visibility. The first
5911 -- element of the limited view is a header (an E_Package entity) that is
5912 -- used to reference the first shadow entity in the private part of the
5915 Lim_Header := Limited_View (P);
5916 Lim_Typ := First_Entity (Lim_Header);
5918 -- Remove package and shadow entities from visibility if it has not
5921 if not Analyzed (P_Unit) then
5923 Set_Is_Immediately_Visible (P, False);
5925 while Present (Lim_Typ) loop
5927 Next_Entity (Lim_Typ);
5930 -- Otherwise this package has already appeared in the closure and its
5931 -- shadow entities must be replaced by its real entities. This code
5932 -- must be kept synchronized with the complementary code in Install
5933 -- Limited_Withed_Unit.
5936 -- Real entities that are type or subtype declarations were hidden
5937 -- from visibility at the point of installation of the limited-view.
5938 -- Now we recover the previous value of the hidden attribute.
5940 E := First_Entity (P);
5941 while Present (E) and then E /= First_Private_Entity (P) loop
5943 Set_Is_Hidden (E, Was_Hidden (E));
5949 while Present (Lim_Typ)
5950 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5952 -- Nested packages and child units were not unchained
5954 if Ekind (Lim_Typ) /= E_Package
5955 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5957 -- If the package has incomplete types, the limited view of the
5958 -- incomplete type is in fact never visible (AI05-129) but we
5959 -- have created a shadow entity E1 for it, that points to E2,
5960 -- a non-limited incomplete type. This in turn has a full view
5961 -- E3 that is the full declaration. There is a corresponding
5962 -- shadow entity E4. When reinstalling the non-limited view,
5963 -- E2 must become the current entity and E3 must be ignored.
5965 E := Non_Limited_View (Lim_Typ);
5967 if Present (Current_Entity (E))
5968 and then Ekind (Current_Entity (E)) = E_Incomplete_Type
5969 and then Full_View (Current_Entity (E)) = E
5972 -- Lim_Typ is the limited view of a full type declaration
5973 -- that has a previous incomplete declaration, i.e. E3 from
5974 -- the previous description. Nothing to insert.
5979 pragma Assert (not In_Chain (E));
5981 Prev := Current_Entity (Lim_Typ);
5983 if Prev = Lim_Typ then
5984 Set_Current_Entity (E);
5987 while Present (Prev)
5988 and then Homonym (Prev) /= Lim_Typ
5990 Prev := Homonym (Prev);
5993 if Present (Prev) then
5994 Set_Homonym (Prev, E);
5998 -- Preserve structure of homonym chain
6000 Set_Homonym (E, Homonym (Lim_Typ));
6004 Next_Entity (Lim_Typ);
6008 -- Indicate that the limited view of the package is not installed
6010 Set_From_With_Type (P, False);
6011 Set_Limited_View_Installed (N, False);
6012 end Remove_Limited_With_Clause;
6014 --------------------
6015 -- Remove_Parents --
6016 --------------------
6018 procedure Remove_Parents (Lib_Unit : Node_Id) is
6021 P_Spec : Node_Id := Empty;
6023 Vis : constant Boolean :=
6024 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
6027 if Is_Child_Spec (Lib_Unit) then
6028 P_Spec := Parent_Spec (Lib_Unit);
6030 elsif Nkind (Lib_Unit) = N_Package_Body
6031 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
6033 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
6036 if Present (P_Spec) then
6038 P_Name := Get_Parent_Entity (P);
6039 Remove_Context_Clauses (P_Spec);
6040 End_Package_Scope (P_Name);
6041 Set_Is_Immediately_Visible (P_Name, Vis);
6043 -- Remove from visibility the siblings as well, which are directly
6044 -- visible while the parent is in scope.
6046 E := First_Entity (P_Name);
6047 while Present (E) loop
6048 if Is_Child_Unit (E) then
6049 Set_Is_Immediately_Visible (E, False);
6055 Set_In_Package_Body (P_Name, False);
6057 -- This is the recursive call to remove the context of any higher
6058 -- level parent. This recursion ensures that all parents are removed
6059 -- in the reverse order of their installation.
6065 ---------------------------------
6066 -- Remove_Private_With_Clauses --
6067 ---------------------------------
6069 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
6072 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
6073 -- Check whether a given unit appears in a regular with_clause. Used to
6074 -- determine whether a private_with_clause, implicit or explicit, should
6077 ----------------------------
6078 -- In_Regular_With_Clause --
6079 ----------------------------
6081 function In_Regular_With_Clause (E : Entity_Id) return Boolean
6086 Item := First (Context_Items (Comp_Unit));
6087 while Present (Item) loop
6088 if Nkind (Item) = N_With_Clause
6089 and then Entity (Name (Item)) = E
6090 and then not Private_Present (Item)
6098 end In_Regular_With_Clause;
6100 -- Start of processing for Remove_Private_With_Clauses
6103 Item := First (Context_Items (Comp_Unit));
6104 while Present (Item) loop
6105 if Nkind (Item) = N_With_Clause
6106 and then Private_Present (Item)
6108 -- If private_with_clause is redundant, remove it from context,
6109 -- as a small optimization to subsequent handling of private_with
6110 -- clauses in other nested packages.
6112 if In_Regular_With_Clause (Entity (Name (Item))) then
6114 Nxt : constant Node_Id := Next (Item);
6120 elsif Limited_Present (Item) then
6121 if not Limited_View_Installed (Item) then
6122 Remove_Limited_With_Clause (Item);
6128 Remove_Unit_From_Visibility (Entity (Name (Item)));
6129 Set_Context_Installed (Item, False);
6137 end Remove_Private_With_Clauses;
6139 ---------------------------------
6140 -- Remove_Unit_From_Visibility --
6141 ---------------------------------
6143 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
6144 P : constant Entity_Id := Scope (Unit_Name);
6147 if Debug_Flag_I then
6148 Write_Str ("remove unit ");
6149 Write_Name (Chars (Unit_Name));
6150 Write_Str (" from visibility");
6154 if P /= Standard_Standard then
6155 Set_Is_Visible_Child_Unit (Unit_Name, False);
6158 Set_Is_Potentially_Use_Visible (Unit_Name, False);
6159 Set_Is_Immediately_Visible (Unit_Name, False);
6160 end Remove_Unit_From_Visibility;
6175 procedure Unchain (E : Entity_Id) is
6179 Prev := Current_Entity (E);
6185 Set_Name_Entity_Id (Chars (E), Homonym (E));
6188 while Present (Prev)
6189 and then Homonym (Prev) /= E
6191 Prev := Homonym (Prev);
6194 if Present (Prev) then
6195 Set_Homonym (Prev, Homonym (E));
6199 if Debug_Flag_I then
6200 Write_Str (" (homonym) unchain ");
6201 Write_Name (Chars (E));
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