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_Aux; use Sem_Aux;
51 with Sem_Ch3; use Sem_Ch3;
52 with Sem_Ch6; use Sem_Ch6;
53 with Sem_Ch7; use Sem_Ch7;
54 with Sem_Ch8; use Sem_Ch8;
55 with Sem_Dist; use Sem_Dist;
56 with Sem_Prag; use Sem_Prag;
57 with Sem_Util; use Sem_Util;
58 with Sem_Warn; use Sem_Warn;
59 with Stand; use Stand;
60 with Sinfo; use Sinfo;
61 with Sinfo.CN; use Sinfo.CN;
62 with Sinput; use Sinput;
63 with Snames; use Snames;
64 with Style; use Style;
65 with Stylesw; use Stylesw;
66 with Tbuild; use Tbuild;
67 with Uname; use Uname;
69 package body Sem_Ch10 is
71 -----------------------
72 -- Local Subprograms --
73 -----------------------
75 procedure Analyze_Context (N : Node_Id);
76 -- Analyzes items in the context clause of compilation unit
78 procedure Build_Limited_Views (N : Node_Id);
79 -- Build and decorate the list of shadow entities for a package mentioned
80 -- in a limited_with clause. If the package was not previously analyzed
81 -- then it also performs a basic decoration of the real entities. This is
82 -- required to do not pass non-decorated entities to the back-end.
83 -- Implements Ada 2005 (AI-50217).
85 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id);
86 -- Check whether the source for the body of a compilation unit must be
87 -- included in a standalone library.
89 procedure Check_Private_Child_Unit (N : Node_Id);
90 -- If a with_clause mentions a private child unit, the compilation unit
91 -- must be a member of the same family, as described in 10.1.2.
93 procedure Check_Stub_Level (N : Node_Id);
94 -- Verify that a stub is declared immediately within a compilation unit,
95 -- and not in an inner frame.
97 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id);
98 -- When a child unit appears in a context clause, the implicit withs on
99 -- parents are made explicit, and with clauses are inserted in the context
100 -- clause before the one for the child. If a parent in the with_clause
101 -- is a renaming, the implicit with_clause is on the renaming whose name
102 -- is mentioned in the with_clause, and not on the package it renames.
103 -- N is the compilation unit whose list of context items receives the
104 -- implicit with_clauses.
106 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
107 -- Get defining entity of parent unit of a child unit. In most cases this
108 -- is the defining entity of the unit, but for a child instance whose
109 -- parent needs a body for inlining, the instantiation node of the parent
110 -- has not yet been rewritten as a package declaration, and the entity has
111 -- to be retrieved from the Instance_Spec of the unit.
113 function Has_With_Clause
116 Is_Limited : Boolean := False) return Boolean;
117 -- Determine whether compilation unit C_Unit contains a [limited] with
118 -- clause for package Pack. Use the flag Is_Limited to designate desired
121 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id);
122 -- If the main unit is a child unit, implicit withs are also added for
123 -- all its ancestors.
125 function In_Chain (E : Entity_Id) return Boolean;
126 -- Check that the shadow entity is not already in the homonym chain, for
127 -- example through a limited_with clause in a parent unit.
129 procedure Install_Context_Clauses (N : Node_Id);
130 -- Subsidiary to Install_Context and Install_Parents. Process all with
131 -- and use clauses for current unit and its library unit if any.
133 procedure Install_Limited_Context_Clauses (N : Node_Id);
134 -- Subsidiary to Install_Context. Process only limited with_clauses for
135 -- current unit. Implements Ada 2005 (AI-50217).
137 procedure Install_Limited_Withed_Unit (N : Node_Id);
138 -- Place shadow entities for a limited_with package in the visibility
139 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
141 procedure Install_Withed_Unit
142 (With_Clause : Node_Id;
143 Private_With_OK : Boolean := False);
144 -- If the unit is not a child unit, make unit immediately visible. The
145 -- caller ensures that the unit is not already currently installed. The
146 -- flag Private_With_OK is set true in Install_Private_With_Clauses, which
147 -- is called when compiling the private part of a package, or installing
148 -- the private declarations of a parent unit.
150 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean);
151 -- This procedure establishes the context for the compilation of a child
152 -- unit. If Lib_Unit is a child library spec then the context of the parent
153 -- is installed, and the parent itself made immediately visible, so that
154 -- the child unit is processed in the declarative region of the parent.
155 -- Install_Parents makes a recursive call to itself to ensure that all
156 -- parents are loaded in the nested case. If Lib_Unit is a library body,
157 -- the only effect of Install_Parents is to install the private decls of
158 -- the parents, because the visible parent declarations will have been
159 -- installed as part of the context of the corresponding spec.
161 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id);
162 -- In the compilation of a child unit, a child of any of the ancestor
163 -- units is directly visible if it is visible, because the parent is in
164 -- an enclosing scope. Iterate over context to find child units of U_Name
165 -- or of some ancestor of it.
167 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean;
168 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
169 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
170 -- a library spec that has a parent. If the call to Is_Child_Spec returns
171 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
172 -- compilation unit for the parent spec.
174 -- Lib_Unit can also be a subprogram body that acts as its own spec. If the
175 -- Parent_Spec is non-empty, this is also a child unit.
177 procedure Remove_Context_Clauses (N : Node_Id);
178 -- Subsidiary of previous one. Remove use_ and with_clauses
180 procedure Remove_Limited_With_Clause (N : Node_Id);
181 -- Remove from visibility the shadow entities introduced for a package
182 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
184 procedure Remove_Parents (Lib_Unit : Node_Id);
185 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
186 -- contexts established by the corresponding call to Install_Parents are
187 -- removed. Remove_Parents contains a recursive call to itself to ensure
188 -- that all parents are removed in the nested case.
190 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
191 -- Reset all visibility flags on unit after compiling it, either as a main
192 -- unit or as a unit in the context.
194 procedure Unchain (E : Entity_Id);
195 -- Remove single entity from visibility list
197 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
198 -- Common processing for all stubs (subprograms, tasks, packages, and
199 -- protected cases). N is the stub to be analyzed. Once the subunit name
200 -- is established, load and analyze. Nam is the non-overloadable entity
201 -- for which the proper body provides a completion. Subprogram stubs are
202 -- handled differently because they can be declarations.
205 -- A dummy procedure, for debugging use, called just before analyzing the
206 -- main unit (after dealing with any context clauses).
208 --------------------------
209 -- Limited_With_Clauses --
210 --------------------------
212 -- Limited_With clauses are the mechanism chosen for Ada 2005 to support
213 -- mutually recursive types declared in different units. A limited_with
214 -- clause that names package P in the context of unit U makes the types
215 -- declared in the visible part of P available within U, but with the
216 -- restriction that these types can only be used as incomplete types.
217 -- The limited_with clause does not impose a semantic dependence on P,
218 -- and it is possible for two packages to have limited_with_clauses on
219 -- each other without creating an elaboration circularity.
221 -- To support this feature, the analysis of a limited_with clause must
222 -- create an abbreviated view of the package, without performing any
223 -- semantic analysis on it. This "package abstract" contains shadow types
224 -- that are in one-one correspondence with the real types in the package,
225 -- and that have the properties of incomplete types.
227 -- The implementation creates two element lists: one to chain the shadow
228 -- entities, and one to chain the corresponding type entities in the tree
229 -- of the package. Links between corresponding entities in both chains
230 -- allow the compiler to select the proper view of a given type, depending
231 -- on the context. Note that in contrast with the handling of private
232 -- types, the limited view and the non-limited view of a type are treated
233 -- as separate entities, and no entity exchange needs to take place, which
234 -- makes the implementation must simpler than could be feared.
236 ------------------------------
237 -- Analyze_Compilation_Unit --
238 ------------------------------
240 procedure Analyze_Compilation_Unit (N : Node_Id) is
241 Unit_Node : constant Node_Id := Unit (N);
242 Lib_Unit : Node_Id := Library_Unit (N);
244 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
245 Par_Spec_Name : Unit_Name_Type;
246 Unum : Unit_Number_Type;
248 procedure Check_Redundant_Withs
249 (Context_Items : List_Id;
250 Spec_Context_Items : List_Id := No_List);
251 -- Determine whether the context list of a compilation unit contains
252 -- redundant with clauses. When checking body clauses against spec
253 -- clauses, set Context_Items to the context list of the body and
254 -- Spec_Context_Items to that of the spec. Parent packages are not
255 -- examined for documentation purposes.
257 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
258 -- Generate cross-reference information for the parents of child units.
259 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
261 ---------------------------
262 -- Check_Redundant_Withs --
263 ---------------------------
265 procedure Check_Redundant_Withs
266 (Context_Items : List_Id;
267 Spec_Context_Items : List_Id := No_List)
271 procedure Process_Body_Clauses
272 (Context_List : List_Id;
274 Used : in out Boolean;
275 Used_Type_Or_Elab : in out Boolean);
276 -- Examine the context clauses of a package body, trying to match the
277 -- name entity of Clause with any list element. If the match occurs
278 -- on a use package clause set Used to True, for a use type clause or
279 -- pragma Elaborate[_All], set Used_Type_Or_Elab to True.
281 procedure Process_Spec_Clauses
282 (Context_List : List_Id;
284 Used : in out Boolean;
285 Withed : in out Boolean;
286 Exit_On_Self : Boolean := False);
287 -- Examine the context clauses of a package spec, trying to match
288 -- the name entity of Clause with any list element. If the match
289 -- occurs on a use package clause, set Used to True, for a with
290 -- package clause other than Clause, set Withed to True. Limited
291 -- with clauses, implicitly generated with clauses and withs
292 -- having pragmas Elaborate or Elaborate_All applied to them are
293 -- skipped. Exit_On_Self is used to control the search loop and
294 -- force an exit whenever Clause sees itself in the search.
296 --------------------------
297 -- Process_Body_Clauses --
298 --------------------------
300 procedure Process_Body_Clauses
301 (Context_List : List_Id;
303 Used : in out Boolean;
304 Used_Type_Or_Elab : in out Boolean)
306 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
312 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean;
313 -- In an expanded name in a use clause, if the prefix is a renamed
314 -- package, the entity is set to the original package as a result,
315 -- when checking whether the package appears in a previous with
316 -- clause, the renaming has to be taken into account, to prevent
317 -- spurious/incorrect warnings. A common case is use of Text_IO.
323 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean is
325 return Entity (N) = P
327 (Present (Renamed_Object (P))
328 and then Entity (N) = Renamed_Object (P));
331 -- Start of processing for Process_Body_Clauses
335 Used_Type_Or_Elab := False;
337 Cont_Item := First (Context_List);
338 while Present (Cont_Item) loop
340 -- Package use clause
342 if Nkind (Cont_Item) = N_Use_Package_Clause
345 -- Search through use clauses
347 Use_Item := First (Names (Cont_Item));
348 while Present (Use_Item) and then not Used loop
350 -- Case of a direct use of the one we are looking for
352 if Entity (Use_Item) = Nam_Ent then
355 -- Handle nested case, as in "with P; use P.Q.R"
362 -- Loop through prefixes looking for match
365 while Nkind (UE) = N_Expanded_Name loop
366 if Same_Unit (Prefix (UE), Nam_Ent) then
381 elsif Nkind (Cont_Item) = N_Use_Type_Clause
382 and then not Used_Type_Or_Elab
384 Subt_Mark := First (Subtype_Marks (Cont_Item));
385 while Present (Subt_Mark)
386 and then not Used_Type_Or_Elab
388 if Same_Unit (Prefix (Subt_Mark), Nam_Ent) then
389 Used_Type_Or_Elab := True;
395 -- Pragma Elaborate or Elaborate_All
397 elsif Nkind (Cont_Item) = N_Pragma
399 (Pragma_Name (Cont_Item) = Name_Elaborate
401 Pragma_Name (Cont_Item) = Name_Elaborate_All)
402 and then not Used_Type_Or_Elab
405 First (Pragma_Argument_Associations (Cont_Item));
406 while Present (Prag_Unit)
407 and then not Used_Type_Or_Elab
409 if Entity (Expression (Prag_Unit)) = Nam_Ent then
410 Used_Type_Or_Elab := True;
419 end Process_Body_Clauses;
421 --------------------------
422 -- Process_Spec_Clauses --
423 --------------------------
425 procedure Process_Spec_Clauses
426 (Context_List : List_Id;
428 Used : in out Boolean;
429 Withed : in out Boolean;
430 Exit_On_Self : Boolean := False)
432 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
440 Cont_Item := First (Context_List);
441 while Present (Cont_Item) loop
443 -- Stop the search since the context items after Cont_Item have
444 -- already been examined in a previous iteration of the reverse
445 -- loop in Check_Redundant_Withs.
448 and Cont_Item = Clause
453 -- Package use clause
455 if Nkind (Cont_Item) = N_Use_Package_Clause
458 Use_Item := First (Names (Cont_Item));
459 while Present (Use_Item) and then not Used loop
460 if Entity (Use_Item) = Nam_Ent then
467 -- Package with clause. Avoid processing self, implicitly
468 -- generated with clauses or limited with clauses. Note that
469 -- we examine with clauses having pragmas Elaborate or
470 -- 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 -- Analyze the package spec
730 Semantics (Lib_Unit);
732 -- Check for unused with's
734 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
736 -- Verify that the library unit is a package declaration
738 if not Nkind_In (Unit (Lib_Unit), N_Package_Declaration,
739 N_Generic_Package_Declaration)
742 ("no legal package declaration for package body", N);
745 -- Otherwise, the entity in the declaration is visible. Update the
746 -- version to reflect dependence of this body on the spec.
749 Spec_Id := Defining_Entity (Unit (Lib_Unit));
750 Set_Is_Immediately_Visible (Spec_Id, True);
751 Version_Update (N, Lib_Unit);
753 if Nkind (Defining_Unit_Name (Unit_Node)) =
754 N_Defining_Program_Unit_Name
756 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
761 -- If the unit is a subprogram body, then we similarly need to analyze
762 -- its spec. However, things are a little simpler in this case, because
763 -- here, this analysis is done mostly for error checking and consistency
764 -- purposes (but not only, e.g. there could be a contract on the spec),
765 -- so there's nothing else to be done.
767 elsif Nkind (Unit_Node) = N_Subprogram_Body then
768 if Acts_As_Spec (N) then
770 -- If the subprogram body is a child unit, we must create a
771 -- declaration for it, in order to properly load the parent(s).
772 -- After this, the original unit does not acts as a spec, because
773 -- there is an explicit one. If this unit appears in a context
774 -- clause, then an implicit with on the parent will be added when
775 -- installing the context. If this is the main unit, there is no
776 -- Unit_Table entry for the declaration (it has the unit number
777 -- of the main unit) and code generation is unaffected.
779 Unum := Get_Cunit_Unit_Number (N);
780 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
782 if Par_Spec_Name /= No_Unit_Name then
785 (Load_Name => Par_Spec_Name,
790 if Unum /= No_Unit then
792 -- Build subprogram declaration and attach parent unit to it
793 -- This subprogram declaration does not come from source,
794 -- Nevertheless the backend must generate debugging info for
795 -- it, and this must be indicated explicitly. We also mark
796 -- the body entity as a child unit now, to prevent a
797 -- cascaded error if the spec entity cannot be entered
798 -- in its scope. Finally we create a Units table entry for
799 -- the subprogram declaration, to maintain a one-to-one
800 -- correspondence with compilation unit nodes. This is
801 -- critical for the tree traversals performed by CodePeer.
804 Loc : constant Source_Ptr := Sloc (N);
805 SCS : constant Boolean :=
806 Get_Comes_From_Source_Default;
809 Set_Comes_From_Source_Default (False);
811 -- Checks for redundant USE TYPE clauses have a special
812 -- exception for the synthetic spec we create here. This
813 -- special case relies on the two compilation units
814 -- sharing the same context clause.
816 -- Note: We used to do a shallow copy (New_Copy_List),
817 -- which defeated those checks and also created malformed
818 -- trees (subtype mark shared by two distinct
819 -- N_Use_Type_Clause nodes) which crashed the compiler.
822 Make_Compilation_Unit (Loc,
823 Context_Items => Context_Items (N),
825 Make_Subprogram_Declaration (Sloc (N),
828 (Specification (Unit_Node))),
830 Make_Compilation_Unit_Aux (Loc));
832 Set_Library_Unit (N, Lib_Unit);
833 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
834 Make_Child_Decl_Unit (N);
835 Semantics (Lib_Unit);
837 -- Now that a separate declaration exists, the body
838 -- of the child unit does not act as spec any longer.
840 Set_Acts_As_Spec (N, False);
841 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
842 Set_Debug_Info_Needed (Defining_Entity (Unit (Lib_Unit)));
843 Set_Comes_From_Source_Default (SCS);
848 -- Here for subprogram with separate declaration
851 Semantics (Lib_Unit);
852 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
853 Version_Update (N, Lib_Unit);
856 -- If this is a child unit, generate references to the parents
858 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
859 N_Defining_Program_Unit_Name
861 Generate_Parent_References (
862 Specification (Unit_Node),
863 Scope (Defining_Entity (Unit (Lib_Unit))));
867 -- If it is a child unit, the parent must be elaborated first and we
868 -- update version, since we are dependent on our parent.
870 if Is_Child_Spec (Unit_Node) then
872 -- The analysis of the parent is done with style checks off
875 Save_Style_Check : constant Boolean := Style_Check;
878 if not GNAT_Mode then
879 Style_Check := False;
882 Semantics (Parent_Spec (Unit_Node));
883 Version_Update (N, Parent_Spec (Unit_Node));
885 -- Restore style check settings
887 Style_Check := Save_Style_Check;
891 -- With the analysis done, install the context. Note that we can't
892 -- install the context from the with clauses as we analyze them, because
893 -- each with clause must be analyzed in a clean visibility context, so
894 -- we have to wait and install them all at once.
898 if Is_Child_Spec (Unit_Node) then
900 -- Set the entities of all parents in the program_unit_name
902 Generate_Parent_References (
903 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
906 -- All components of the context: with-clauses, library unit, ancestors
907 -- if any, (and their context) are analyzed and installed.
909 -- Call special debug routine sm if this is the main unit
911 if Current_Sem_Unit = Main_Unit then
915 -- Now analyze the unit (package, subprogram spec, body) itself
919 if Warn_On_Redundant_Constructs then
920 Check_Redundant_Withs (Context_Items (N));
922 if Nkind (Unit_Node) = N_Package_Body then
923 Check_Redundant_Withs
924 (Context_Items => Context_Items (N),
925 Spec_Context_Items => Context_Items (Lib_Unit));
929 -- The above call might have made Unit_Node an N_Subprogram_Body from
930 -- something else, so propagate any Acts_As_Spec flag.
932 if Nkind (Unit_Node) = N_Subprogram_Body
933 and then Acts_As_Spec (Unit_Node)
935 Set_Acts_As_Spec (N);
938 -- Register predefined units in Rtsfind
941 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
943 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
944 Set_RTU_Loaded (Unit_Node);
948 -- Treat compilation unit pragmas that appear after the library unit
950 if Present (Pragmas_After (Aux_Decls_Node (N))) then
952 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
954 while Present (Prag_Node) loop
961 -- Generate distribution stubs if requested and no error
964 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
966 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
967 and then not Fatal_Error (Main_Unit)
969 if Is_RCI_Pkg_Spec_Or_Body (N) then
971 -- Regular RCI package
973 Add_Stub_Constructs (N);
975 elsif (Nkind (Unit_Node) = N_Package_Declaration
976 and then Is_Shared_Passive (Defining_Entity
977 (Specification (Unit_Node))))
978 or else (Nkind (Unit_Node) = N_Package_Body
980 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
982 -- Shared passive package
984 Add_Stub_Constructs (N);
986 elsif Nkind (Unit_Node) = N_Package_Instantiation
988 Is_Remote_Call_Interface
989 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
991 -- Instantiation of a RCI generic package
993 Add_Stub_Constructs (N);
997 -- Remove unit from visibility, so that environment is clean for the
998 -- next compilation, which is either the main unit or some other unit
1001 if Nkind_In (Unit_Node, N_Package_Declaration,
1002 N_Package_Renaming_Declaration,
1003 N_Subprogram_Declaration)
1004 or else Nkind (Unit_Node) in N_Generic_Declaration
1006 (Nkind (Unit_Node) = N_Subprogram_Body
1007 and then Acts_As_Spec (Unit_Node))
1009 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
1011 -- If the unit is an instantiation whose body will be elaborated for
1012 -- inlining purposes, use the proper entity of the instance. The entity
1013 -- may be missing if the instantiation was illegal.
1015 elsif Nkind (Unit_Node) = N_Package_Instantiation
1016 and then not Error_Posted (Unit_Node)
1017 and then Present (Instance_Spec (Unit_Node))
1019 Remove_Unit_From_Visibility
1020 (Defining_Entity (Instance_Spec (Unit_Node)));
1022 elsif Nkind (Unit_Node) = N_Package_Body
1023 or else (Nkind (Unit_Node) = N_Subprogram_Body
1024 and then not Acts_As_Spec (Unit_Node))
1026 -- Bodies that are not the main unit are compiled if they are generic
1027 -- or contain generic or inlined units. Their analysis brings in the
1028 -- context of the corresponding spec (unit declaration) which must be
1029 -- removed as well, to return the compilation environment to its
1032 Remove_Context (Lib_Unit);
1033 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
1036 -- Last step is to deinstall the context we just installed as well as
1037 -- the unit just compiled.
1041 -- If this is the main unit and we are generating code, we must check
1042 -- that all generic units in the context have a body if they need it,
1043 -- even if they have not been instantiated. In the absence of .ali files
1044 -- for generic units, we must force the load of the body, just to
1045 -- produce the proper error if the body is absent. We skip this
1046 -- verification if the main unit itself is generic.
1048 if Get_Cunit_Unit_Number (N) = Main_Unit
1049 and then Operating_Mode = Generate_Code
1050 and then Expander_Active
1052 -- Check whether the source for the body of the unit must be included
1053 -- in a standalone library.
1055 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
1057 -- Indicate that the main unit is now analyzed, to catch possible
1058 -- circularities between it and generic bodies. Remove main unit from
1059 -- visibility. This might seem superfluous, but the main unit must
1060 -- not be visible in the generic body expansions that follow.
1062 Set_Analyzed (N, True);
1063 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
1068 Un : Unit_Number_Type;
1070 Save_Style_Check : constant Boolean := Style_Check;
1073 Item := First (Context_Items (N));
1074 while Present (Item) loop
1076 -- Check for explicit with clause
1078 if Nkind (Item) = N_With_Clause
1079 and then not Implicit_With (Item)
1081 -- Ada 2005 (AI-50217): Ignore limited-withed units
1083 and then not Limited_Present (Item)
1085 Nam := Entity (Name (Item));
1087 -- Compile generic subprogram, unless it is intrinsic or
1088 -- imported so no body is required, or generic package body
1089 -- if the package spec requires a body.
1091 if (Is_Generic_Subprogram (Nam)
1092 and then not Is_Intrinsic_Subprogram (Nam)
1093 and then not Is_Imported (Nam))
1094 or else (Ekind (Nam) = E_Generic_Package
1095 and then Unit_Requires_Body (Nam))
1097 Style_Check := False;
1099 if Present (Renamed_Object (Nam)) then
1102 (Load_Name => Get_Body_Name
1104 (Unit_Declaration_Node
1105 (Renamed_Object (Nam)))),
1113 (Load_Name => Get_Body_Name
1114 (Get_Unit_Name (Item)),
1121 if Un = No_Unit then
1123 ("body of generic unit& not found", Item, Nam);
1126 elsif not Analyzed (Cunit (Un))
1127 and then Un /= Main_Unit
1128 and then not Fatal_Error (Un)
1130 Style_Check := False;
1131 Semantics (Cunit (Un));
1139 -- Restore style checks settings
1141 Style_Check := Save_Style_Check;
1145 -- Deal with creating elaboration Boolean if needed. We create an
1146 -- elaboration boolean only for units that come from source since
1147 -- units manufactured by the compiler never need elab checks.
1149 if Comes_From_Source (N)
1150 and then Nkind_In (Unit_Node, N_Package_Declaration,
1151 N_Generic_Package_Declaration,
1152 N_Subprogram_Declaration,
1153 N_Generic_Subprogram_Declaration)
1156 Loc : constant Source_Ptr := Sloc (N);
1157 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1160 Spec_Id := Defining_Entity (Unit_Node);
1161 Generate_Definition (Spec_Id);
1163 -- See if an elaboration entity is required for possible access
1164 -- before elaboration checking. Note that we must allow for this
1165 -- even if -gnatE is not set, since a client may be compiled in
1166 -- -gnatE mode and reference the entity.
1168 -- These entities are also used by the binder to prevent multiple
1169 -- attempts to execute the elaboration code for the library case
1170 -- where the elaboration routine might otherwise be called more
1173 -- Case of units which do not require elaboration checks
1176 -- Pure units do not need checks
1180 -- Preelaborated units do not need checks
1182 or else Is_Preelaborated (Spec_Id)
1184 -- No checks needed if pragma Elaborate_Body present
1186 or else Has_Pragma_Elaborate_Body (Spec_Id)
1188 -- No checks needed if unit does not require a body
1190 or else not Unit_Requires_Body (Spec_Id)
1192 -- No checks needed for predefined files
1194 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1196 -- No checks required if no separate spec
1198 or else Acts_As_Spec (N)
1200 -- This is a case where we only need the entity for
1201 -- checking to prevent multiple elaboration checks.
1203 Set_Elaboration_Entity_Required (Spec_Id, False);
1205 -- Case of elaboration entity is required for access before
1206 -- elaboration checking (so certainly we must build it!)
1209 Set_Elaboration_Entity_Required (Spec_Id, True);
1212 Build_Elaboration_Entity (N, Spec_Id);
1216 -- Freeze the compilation unit entity. This for sure is needed because
1217 -- of some warnings that can be output (see Freeze_Subprogram), but may
1218 -- in general be required. If freezing actions result, place them in the
1219 -- compilation unit actions list, and analyze them.
1222 L : constant List_Id :=
1223 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), N);
1225 while Is_Non_Empty_List (L) loop
1226 Insert_Library_Level_Action (Remove_Head (L));
1232 if Nkind (Unit_Node) = N_Package_Declaration
1233 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1234 and then Expander_Active
1237 Save_Style_Check : constant Boolean := Style_Check;
1238 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1239 Options : Style_Check_Options;
1242 Save_Style_Check_Options (Options);
1243 Reset_Style_Check_Options;
1244 Opt.Warning_Mode := Suppress;
1245 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1247 Reset_Style_Check_Options;
1248 Set_Style_Check_Options (Options);
1249 Style_Check := Save_Style_Check;
1250 Warning_Mode := Save_Warning;
1254 -- If we are generating obsolescent warnings, then here is where we
1255 -- generate them for the with'ed items. The reason for this special
1256 -- processing is that the normal mechanism of generating the warnings
1257 -- for referenced entities does not work for context clause references.
1258 -- That's because when we first analyze the context, it is too early to
1259 -- know if the with'ing unit is itself obsolescent (which suppresses
1262 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1264 -- Push current compilation unit as scope, so that the test for
1265 -- being within an obsolescent unit will work correctly.
1267 Push_Scope (Defining_Entity (Unit_Node));
1269 -- Loop through context items to deal with with clauses
1277 Item := First (Context_Items (N));
1278 while Present (Item) loop
1279 if Nkind (Item) = N_With_Clause
1281 -- Suppress this check in limited-withed units. Further work
1282 -- needed here if we decide to incorporate this check on
1283 -- limited-withed units.
1285 and then not Limited_Present (Item)
1288 Ent := Entity (Nam);
1290 if Is_Obsolescent (Ent) then
1291 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1299 -- Remove temporary install of current unit as scope
1303 end Analyze_Compilation_Unit;
1305 ---------------------
1306 -- Analyze_Context --
1307 ---------------------
1309 procedure Analyze_Context (N : Node_Id) is
1310 Ukind : constant Node_Kind := Nkind (Unit (N));
1314 -- First process all configuration pragmas at the start of the context
1315 -- items. Strictly these are not part of the context clause, but that
1316 -- is where the parser puts them. In any case for sure we must analyze
1317 -- these before analyzing the actual context items, since they can have
1318 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1319 -- be with'ed as a result of changing categorizations in Ada 2005).
1321 Item := First (Context_Items (N));
1322 while Present (Item)
1323 and then Nkind (Item) = N_Pragma
1324 and then Pragma_Name (Item) in Configuration_Pragma_Names
1330 -- This is the point at which we capture the configuration settings
1331 -- for the unit. At the moment only the Optimize_Alignment setting
1332 -- needs to be captured. Probably more later ???
1334 if Optimize_Alignment_Local then
1335 Set_OA_Setting (Current_Sem_Unit, 'L');
1337 Set_OA_Setting (Current_Sem_Unit, Optimize_Alignment);
1340 -- Loop through actual context items. This is done in two passes:
1342 -- a) The first pass analyzes non-limited with-clauses and also any
1343 -- configuration pragmas (we need to get the latter analyzed right
1344 -- away, since they can affect processing of subsequent items.
1346 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1348 while Present (Item) loop
1350 -- For with clause, analyze the with clause, and then update the
1351 -- version, since we are dependent on a unit that we with.
1353 if Nkind (Item) = N_With_Clause
1354 and then not Limited_Present (Item)
1356 -- Skip analyzing with clause if no unit, nothing to do (this
1357 -- happens for a with that references a non-existent unit). Skip
1358 -- as well if this is a with_clause for the main unit, which
1359 -- happens if a subunit has a useless with_clause on its parent.
1361 if Present (Library_Unit (Item)) then
1362 if Library_Unit (Item) /= Cunit (Current_Sem_Unit) then
1366 Set_Entity (Name (Item), Cunit_Entity (Current_Sem_Unit));
1370 if not Implicit_With (Item) then
1371 Version_Update (N, Library_Unit (Item));
1374 -- Skip pragmas. Configuration pragmas at the start were handled in
1375 -- the loop above, and remaining pragmas are not processed until we
1376 -- actually install the context (see Install_Context). We delay the
1377 -- analysis of these pragmas to make sure that we have installed all
1378 -- the implicit with's on parent units.
1380 -- Skip use clauses at this stage, since we don't want to do any
1381 -- installing of potentially use-visible entities until we
1382 -- actually install the complete context (in Install_Context).
1383 -- Otherwise things can get installed in the wrong context.
1392 -- Second pass: examine all limited_with clauses. All other context
1393 -- items are ignored in this pass.
1395 Item := First (Context_Items (N));
1396 while Present (Item) loop
1397 if Nkind (Item) = N_With_Clause
1398 and then Limited_Present (Item)
1400 -- No need to check errors on implicitly generated limited-with
1403 if not Implicit_With (Item) then
1405 -- Verify that the illegal contexts given in 10.1.2 (18/2) are
1406 -- properly rejected, including renaming declarations.
1408 if not Nkind_In (Ukind, N_Package_Declaration,
1409 N_Subprogram_Declaration)
1410 and then Ukind not in N_Generic_Declaration
1411 and then Ukind not in N_Generic_Instantiation
1413 Error_Msg_N ("limited with_clause not allowed here", Item);
1415 -- Check wrong use of a limited with clause applied to the
1416 -- compilation unit containing the limited-with clause.
1418 -- limited with P.Q;
1419 -- package P.Q is ...
1421 elsif Unit (Library_Unit (Item)) = Unit (N) then
1422 Error_Msg_N ("wrong use of limited-with clause", Item);
1424 -- Check wrong use of limited-with clause applied to some
1425 -- immediate ancestor.
1427 elsif Is_Child_Spec (Unit (N)) then
1429 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1433 P := Parent_Spec (Unit (N));
1435 if Unit (P) = Lib_U then
1436 Error_Msg_N ("limited with_clause cannot "
1437 & "name ancestor", Item);
1441 exit when not Is_Child_Spec (Unit (P));
1442 P := Parent_Spec (Unit (P));
1447 -- Check if the limited-withed unit is already visible through
1448 -- some context clause of the current compilation unit or some
1449 -- ancestor of the current compilation unit.
1452 Lim_Unit_Name : constant Node_Id := Name (Item);
1453 Comp_Unit : Node_Id;
1455 Unit_Name : Node_Id;
1460 It := First (Context_Items (Comp_Unit));
1461 while Present (It) loop
1463 and then Nkind (It) = N_With_Clause
1464 and then not Limited_Present (It)
1466 Nkind_In (Unit (Library_Unit (It)),
1467 N_Package_Declaration,
1468 N_Package_Renaming_Declaration)
1470 if Nkind (Unit (Library_Unit (It))) =
1471 N_Package_Declaration
1473 Unit_Name := Name (It);
1475 Unit_Name := Name (Unit (Library_Unit (It)));
1478 -- Check if the named package (or some ancestor)
1479 -- leaves visible the full-view of the unit given
1480 -- in the limited-with clause
1483 if Designate_Same_Unit (Lim_Unit_Name,
1486 Error_Msg_Sloc := Sloc (It);
1488 ("simultaneous visibility of limited "
1489 & "and unlimited views not allowed",
1492 ("\unlimited view visible through "
1493 & "context clause #",
1497 elsif Nkind (Unit_Name) = N_Identifier then
1501 Unit_Name := Prefix (Unit_Name);
1508 exit when not Is_Child_Spec (Unit (Comp_Unit));
1510 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1515 -- Skip analyzing with clause if no unit, see above
1517 if Present (Library_Unit (Item)) then
1521 -- A limited_with does not impose an elaboration order, but
1522 -- there is a semantic dependency for recompilation purposes.
1524 if not Implicit_With (Item) then
1525 Version_Update (N, Library_Unit (Item));
1528 -- Pragmas and use clauses and with clauses other than limited
1529 -- with's are ignored in this pass through the context items.
1537 end Analyze_Context;
1539 -------------------------------
1540 -- Analyze_Package_Body_Stub --
1541 -------------------------------
1543 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1544 Id : constant Entity_Id := Defining_Identifier (N);
1548 -- The package declaration must be in the current declarative part
1550 Check_Stub_Level (N);
1551 Nam := Current_Entity_In_Scope (Id);
1553 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1554 Error_Msg_N ("missing specification for package stub", N);
1556 elsif Has_Completion (Nam)
1557 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1559 Error_Msg_N ("duplicate or redundant stub for package", N);
1562 -- Indicate that the body of the package exists. If we are doing
1563 -- only semantic analysis, the stub stands for the body. If we are
1564 -- generating code, the existence of the body will be confirmed
1565 -- when we load the proper body.
1567 Set_Has_Completion (Nam);
1568 Set_Scope (Defining_Entity (N), Current_Scope);
1569 Generate_Reference (Nam, Id, 'b');
1570 Analyze_Proper_Body (N, Nam);
1572 end Analyze_Package_Body_Stub;
1574 -------------------------
1575 -- Analyze_Proper_Body --
1576 -------------------------
1578 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1579 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1580 Unum : Unit_Number_Type;
1582 procedure Optional_Subunit;
1583 -- This procedure is called when the main unit is a stub, or when we
1584 -- are not generating code. In such a case, we analyze the subunit if
1585 -- present, which is user-friendly and in fact required for ASIS, but
1586 -- we don't complain if the subunit is missing.
1588 ----------------------
1589 -- Optional_Subunit --
1590 ----------------------
1592 procedure Optional_Subunit is
1593 Comp_Unit : Node_Id;
1596 -- Try to load subunit, but ignore any errors that occur during the
1597 -- loading of the subunit, by using the special feature in Errout to
1598 -- ignore all errors. Note that Fatal_Error will still be set, so we
1599 -- will be able to check for this case below.
1601 if not ASIS_Mode then
1602 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1607 (Load_Name => Subunit_Name,
1612 if not ASIS_Mode then
1613 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1616 -- All done if we successfully loaded the subunit
1619 and then (not Fatal_Error (Unum) or else Try_Semantics)
1621 Comp_Unit := Cunit (Unum);
1623 -- If the file was empty or seriously mangled, the unit itself may
1626 if No (Unit (Comp_Unit)) then
1628 ("subunit does not contain expected proper body", N);
1630 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1632 ("expected SEPARATE subunit, found child unit",
1633 Cunit_Entity (Unum));
1635 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1636 Analyze_Subunit (Comp_Unit);
1637 Set_Library_Unit (N, Comp_Unit);
1640 elsif Unum = No_Unit
1641 and then Present (Nam)
1643 if Is_Protected_Type (Nam) then
1644 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1646 Set_Corresponding_Body (
1647 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1650 end Optional_Subunit;
1652 -- Start of processing for Analyze_Proper_Body
1655 -- If the subunit is already loaded, it means that the main unit is a
1656 -- subunit, and that the current unit is one of its parents which was
1657 -- being analyzed to provide the needed context for the analysis of the
1658 -- subunit. In this case we analyze the subunit and continue with the
1659 -- parent, without looking at subsequent subunits.
1661 if Is_Loaded (Subunit_Name) then
1663 -- If the proper body is already linked to the stub node, the stub is
1664 -- in a generic unit and just needs analyzing.
1666 if Present (Library_Unit (N)) then
1667 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1669 -- If the subunit has severe errors, the spec of the enclosing
1670 -- body may not be available, in which case do not try analysis.
1672 if Serious_Errors_Detected > 0
1673 and then No (Library_Unit (Library_Unit (N)))
1678 Analyze_Subunit (Library_Unit (N));
1680 -- Otherwise we must load the subunit and link to it
1683 -- Load the subunit, this must work, since we originally loaded
1684 -- the subunit earlier on. So this will not really load it, just
1685 -- give access to it.
1689 (Load_Name => Subunit_Name,
1694 -- And analyze the subunit in the parent context (note that we
1695 -- do not call Semantics, since that would remove the parent
1696 -- context). Because of this, we have to manually reset the
1697 -- compiler state to Analyzing since it got destroyed by Load.
1699 if Unum /= No_Unit then
1700 Compiler_State := Analyzing;
1702 -- Check that the proper body is a subunit and not a child
1703 -- unit. If the unit was previously loaded, the error will
1704 -- have been emitted when copying the generic node, so we
1705 -- just return to avoid cascaded errors.
1707 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1711 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1712 Analyze_Subunit (Cunit (Unum));
1713 Set_Library_Unit (N, Cunit (Unum));
1717 -- If the main unit is a subunit, then we are just performing semantic
1718 -- analysis on that subunit, and any other subunits of any parent unit
1719 -- should be ignored, except that if we are building trees for ASIS
1720 -- usage we want to annotate the stub properly.
1722 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1723 and then Subunit_Name /= Unit_Name (Main_Unit)
1729 -- But before we return, set the flag for unloaded subunits. This
1730 -- will suppress junk warnings of variables in the same declarative
1731 -- part (or a higher level one) that are in danger of looking unused
1732 -- when in fact there might be a declaration in the subunit that we
1733 -- do not intend to load.
1735 Unloaded_Subunits := True;
1738 -- If the subunit is not already loaded, and we are generating code,
1739 -- then this is the case where compilation started from the parent, and
1740 -- we are generating code for an entire subunit tree. In that case we
1741 -- definitely need to load the subunit.
1743 -- In order to continue the analysis with the rest of the parent,
1744 -- and other subunits, we load the unit without requiring its
1745 -- presence, and emit a warning if not found, rather than terminating
1746 -- the compilation abruptly, as for other missing file problems.
1748 elsif Original_Operating_Mode = Generate_Code then
1750 -- If the proper body is already linked to the stub node, the stub is
1751 -- in a generic unit and just needs analyzing.
1753 -- We update the version. Although we are not strictly technically
1754 -- semantically dependent on the subunit, given our approach of macro
1755 -- substitution of subunits, it makes sense to include it in the
1756 -- version identification.
1758 if Present (Library_Unit (N)) then
1759 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1760 Analyze_Subunit (Library_Unit (N));
1761 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1763 -- Otherwise we must load the subunit and link to it
1766 -- Make sure that, if the subunit is preprocessed and -gnateG is
1767 -- specified, the preprocessed file will be written.
1769 Lib.Analysing_Subunit_Of_Main := True;
1772 (Load_Name => Subunit_Name,
1776 Lib.Analysing_Subunit_Of_Main := False;
1778 -- Give message if we did not get the unit Emit warning even if
1779 -- missing subunit is not within main unit, to simplify debugging.
1781 if Original_Operating_Mode = Generate_Code
1782 and then Unum = No_Unit
1784 Error_Msg_Unit_1 := Subunit_Name;
1786 Get_File_Name (Subunit_Name, Subunit => True);
1788 ("subunit$$ in file{ not found?!!", N);
1789 Subunits_Missing := True;
1792 -- Load_Unit may reset Compiler_State, since it may have been
1793 -- necessary to parse an additional units, so we make sure that
1794 -- we reset it to the Analyzing state.
1796 Compiler_State := Analyzing;
1798 if Unum /= No_Unit then
1799 if Debug_Flag_L then
1800 Write_Str ("*** Loaded subunit from stub. Analyze");
1805 Comp_Unit : constant Node_Id := Cunit (Unum);
1808 -- Check for child unit instead of subunit
1810 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1812 ("expected SEPARATE subunit, found child unit",
1813 Cunit_Entity (Unum));
1815 -- OK, we have a subunit
1818 -- Set corresponding stub (even if errors)
1820 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1822 -- Collect SCO information for loaded subunit if we are
1823 -- in the main unit).
1827 In_Extended_Main_Source_Unit
1828 (Cunit_Entity (Current_Sem_Unit))
1833 -- Analyze the unit if semantics active
1835 if not Fatal_Error (Unum) or else Try_Semantics then
1836 Analyze_Subunit (Comp_Unit);
1839 -- Set the library unit pointer in any case
1841 Set_Library_Unit (N, Comp_Unit);
1843 -- We update the version. Although we are not technically
1844 -- semantically dependent on the subunit, given our
1845 -- approach of macro substitution of subunits, it makes
1846 -- sense to include it in the version identification.
1848 Version_Update (Cunit (Main_Unit), Comp_Unit);
1854 -- The remaining case is when the subunit is not already loaded and we
1855 -- are not generating code. In this case we are just performing semantic
1856 -- analysis on the parent, and we are not interested in the subunit. For
1857 -- subprograms, analyze the stub as a body. For other entities the stub
1858 -- has already been marked as completed.
1863 end Analyze_Proper_Body;
1865 ----------------------------------
1866 -- Analyze_Protected_Body_Stub --
1867 ----------------------------------
1869 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1870 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1873 Check_Stub_Level (N);
1875 -- First occurrence of name may have been as an incomplete type
1877 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1878 Nam := Full_View (Nam);
1882 or else not Is_Protected_Type (Etype (Nam))
1884 Error_Msg_N ("missing specification for Protected body", N);
1886 Set_Scope (Defining_Entity (N), Current_Scope);
1887 Set_Has_Completion (Etype (Nam));
1888 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1889 Analyze_Proper_Body (N, Etype (Nam));
1891 end Analyze_Protected_Body_Stub;
1893 ----------------------------------
1894 -- Analyze_Subprogram_Body_Stub --
1895 ----------------------------------
1897 -- A subprogram body stub can appear with or without a previous spec. If
1898 -- there is one, then the analysis of the body will find it and verify
1899 -- conformance. The formals appearing in the specification of the stub play
1900 -- no role, except for requiring an additional conformance check. If there
1901 -- is no previous subprogram declaration, the stub acts as a spec, and
1902 -- provides the defining entity for the subprogram.
1904 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1908 Check_Stub_Level (N);
1910 -- Verify that the identifier for the stub is unique within this
1911 -- declarative part.
1913 if Nkind_In (Parent (N), N_Block_Statement,
1917 Decl := First (Declarations (Parent (N)));
1918 while Present (Decl)
1921 if Nkind (Decl) = N_Subprogram_Body_Stub
1922 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1923 Chars (Defining_Unit_Name (Specification (N))))
1925 Error_Msg_N ("identifier for stub is not unique", N);
1932 -- Treat stub as a body, which checks conformance if there is a previous
1933 -- declaration, or else introduces entity and its signature.
1935 Analyze_Subprogram_Body (N);
1936 Analyze_Proper_Body (N, Empty);
1937 end Analyze_Subprogram_Body_Stub;
1939 ---------------------
1940 -- Analyze_Subunit --
1941 ---------------------
1943 -- A subunit is compiled either by itself (for semantic checking) or as
1944 -- part of compiling the parent (for code generation). In either case, by
1945 -- the time we actually process the subunit, the parent has already been
1946 -- installed and analyzed. The node N is a compilation unit, whose context
1947 -- needs to be treated here, because we come directly here from the parent
1948 -- without calling Analyze_Compilation_Unit.
1950 -- The compilation context includes the explicit context of the subunit,
1951 -- and the context of the parent, together with the parent itself. In order
1952 -- to compile the current context, we remove the one inherited from the
1953 -- parent, in order to have a clean visibility table. We restore the parent
1954 -- context before analyzing the proper body itself. On exit, we remove only
1955 -- the explicit context of the subunit.
1957 procedure Analyze_Subunit (N : Node_Id) is
1958 Lib_Unit : constant Node_Id := Library_Unit (N);
1959 Par_Unit : constant Entity_Id := Current_Scope;
1961 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1962 Num_Scopes : Int := 0;
1963 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1964 Enclosing_Child : Entity_Id := Empty;
1965 Svg : constant Suppress_Array := Scope_Suppress;
1967 procedure Analyze_Subunit_Context;
1968 -- Capture names in use clauses of the subunit. This must be done before
1969 -- re-installing parent declarations, because items in the context must
1970 -- not be hidden by declarations local to the parent.
1972 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1973 -- Recursive procedure to restore scope of all ancestors of subunit,
1974 -- from outermost in. If parent is not a subunit, the call to install
1975 -- context installs context of spec and (if parent is a child unit) the
1976 -- context of its parents as well. It is confusing that parents should
1977 -- be treated differently in both cases, but the semantics are just not
1980 procedure Re_Install_Use_Clauses;
1981 -- As part of the removal of the parent scope, the use clauses are
1982 -- removed, to be reinstalled when the context of the subunit has been
1983 -- analyzed. Use clauses may also have been affected by the analysis of
1984 -- the context of the subunit, so they have to be applied again, to
1985 -- insure that the compilation environment of the rest of the parent
1986 -- unit is identical.
1988 procedure Remove_Scope;
1989 -- Remove current scope from scope stack, and preserve the list of use
1990 -- clauses in it, to be reinstalled after context is analyzed.
1992 -----------------------------
1993 -- Analyze_Subunit_Context --
1994 -----------------------------
1996 procedure Analyze_Subunit_Context is
1999 Unit_Name : Entity_Id;
2002 Analyze_Context (N);
2004 -- Make withed units immediately visible. If child unit, make the
2005 -- ultimate parent immediately visible.
2007 Item := First (Context_Items (N));
2008 while Present (Item) loop
2009 if Nkind (Item) = N_With_Clause then
2011 -- Protect frontend against previous errors in context clauses
2013 if Nkind (Name (Item)) /= N_Selected_Component then
2014 if Error_Posted (Item) then
2018 -- If a subunits has serious syntax errors, the context
2019 -- may not have been loaded. Add a harmless unit name to
2020 -- attempt processing.
2022 if Serious_Errors_Detected > 0
2023 and then No (Entity (Name (Item)))
2025 Set_Entity (Name (Item), Standard_Standard);
2028 Unit_Name := Entity (Name (Item));
2029 while Is_Child_Unit (Unit_Name) loop
2030 Set_Is_Visible_Child_Unit (Unit_Name);
2031 Unit_Name := Scope (Unit_Name);
2034 if not Is_Immediately_Visible (Unit_Name) then
2035 Set_Is_Immediately_Visible (Unit_Name);
2036 Set_Context_Installed (Item);
2041 elsif Nkind (Item) = N_Use_Package_Clause then
2042 Nam := First (Names (Item));
2043 while Present (Nam) loop
2048 elsif Nkind (Item) = N_Use_Type_Clause then
2049 Nam := First (Subtype_Marks (Item));
2050 while Present (Nam) loop
2059 -- Reset visibility of withed units. They will be made visible again
2060 -- when we install the subunit context.
2062 Item := First (Context_Items (N));
2063 while Present (Item) loop
2064 if Nkind (Item) = N_With_Clause
2066 -- Protect frontend against previous errors in context clauses
2068 and then Nkind (Name (Item)) /= N_Selected_Component
2069 and then not Error_Posted (Item)
2071 Unit_Name := Entity (Name (Item));
2072 while Is_Child_Unit (Unit_Name) loop
2073 Set_Is_Visible_Child_Unit (Unit_Name, False);
2074 Unit_Name := Scope (Unit_Name);
2077 if Context_Installed (Item) then
2078 Set_Is_Immediately_Visible (Unit_Name, False);
2079 Set_Context_Installed (Item, False);
2085 end Analyze_Subunit_Context;
2087 ------------------------
2088 -- Re_Install_Parents --
2089 ------------------------
2091 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
2095 if Nkind (Unit (L)) = N_Subunit then
2096 Re_Install_Parents (Library_Unit (L), Scope (Scop));
2099 Install_Context (L);
2101 -- If the subunit occurs within a child unit, we must restore the
2102 -- immediate visibility of any siblings that may occur in context.
2104 if Present (Enclosing_Child) then
2105 Install_Siblings (Enclosing_Child, L);
2110 if Scop /= Par_Unit then
2111 Set_Is_Immediately_Visible (Scop);
2114 -- Make entities in scope visible again. For child units, restore
2115 -- visibility only if they are actually in context.
2117 E := First_Entity (Current_Scope);
2118 while Present (E) loop
2119 if not Is_Child_Unit (E)
2120 or else Is_Visible_Child_Unit (E)
2122 Set_Is_Immediately_Visible (E);
2128 -- A subunit appears within a body, and for a nested subunits all the
2129 -- parents are bodies. Restore full visibility of their private
2132 if Is_Package_Or_Generic_Package (Scop) then
2133 Set_In_Package_Body (Scop);
2134 Install_Private_Declarations (Scop);
2136 end Re_Install_Parents;
2138 ----------------------------
2139 -- Re_Install_Use_Clauses --
2140 ----------------------------
2142 procedure Re_Install_Use_Clauses is
2145 for J in reverse 1 .. Num_Scopes loop
2146 U := Use_Clauses (J);
2147 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2148 Install_Use_Clauses (U, Force_Installation => True);
2150 end Re_Install_Use_Clauses;
2156 procedure Remove_Scope is
2160 Num_Scopes := Num_Scopes + 1;
2161 Use_Clauses (Num_Scopes) :=
2162 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2164 E := First_Entity (Current_Scope);
2165 while Present (E) loop
2166 Set_Is_Immediately_Visible (E, False);
2170 if Is_Child_Unit (Current_Scope) then
2171 Enclosing_Child := Current_Scope;
2177 -- Start of processing for Analyze_Subunit
2182 Nam : Node_Id := Name (Unit (N));
2185 if Nkind (Nam) = N_Selected_Component then
2186 Nam := Selector_Name (Nam);
2189 Check_Identifier (Nam, Par_Unit);
2193 if not Is_Empty_List (Context_Items (N)) then
2195 -- Save current use clauses
2198 Remove_Context (Lib_Unit);
2200 -- Now remove parents and their context, including enclosing subunits
2201 -- and the outer parent body which is not a subunit.
2203 if Present (Lib_Spec) then
2204 Remove_Context (Lib_Spec);
2206 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2207 Lib_Spec := Library_Unit (Lib_Spec);
2209 Remove_Context (Lib_Spec);
2212 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2216 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2217 Remove_Context (Library_Unit (Lib_Spec));
2221 Set_Is_Immediately_Visible (Par_Unit, False);
2223 Analyze_Subunit_Context;
2225 Re_Install_Parents (Lib_Unit, Par_Unit);
2226 Set_Is_Immediately_Visible (Par_Unit);
2228 -- If the context includes a child unit of the parent of the subunit,
2229 -- the parent will have been removed from visibility, after compiling
2230 -- that cousin in the context. The visibility of the parent must be
2231 -- restored now. This also applies if the context includes another
2232 -- subunit of the same parent which in turn includes a child unit in
2235 if Is_Package_Or_Generic_Package (Par_Unit) then
2236 if not Is_Immediately_Visible (Par_Unit)
2237 or else (Present (First_Entity (Par_Unit))
2238 and then not Is_Immediately_Visible
2239 (First_Entity (Par_Unit)))
2241 Set_Is_Immediately_Visible (Par_Unit);
2242 Install_Visible_Declarations (Par_Unit);
2243 Install_Private_Declarations (Par_Unit);
2247 Re_Install_Use_Clauses;
2248 Install_Context (N);
2250 -- Restore state of suppress flags for current body
2252 Scope_Suppress := Svg;
2254 -- If the subunit is within a child unit, then siblings of any parent
2255 -- unit that appear in the context clause of the subunit must also be
2256 -- made immediately visible.
2258 if Present (Enclosing_Child) then
2259 Install_Siblings (Enclosing_Child, N);
2263 Analyze (Proper_Body (Unit (N)));
2266 -- The subunit may contain a with_clause on a sibling of some ancestor.
2267 -- Removing the context will remove from visibility those ancestor child
2268 -- units, which must be restored to the visibility they have in the
2271 if Present (Enclosing_Child) then
2277 and then Is_Child_Unit (C)
2279 Set_Is_Immediately_Visible (C);
2280 Set_Is_Visible_Child_Unit (C);
2285 end Analyze_Subunit;
2287 ----------------------------
2288 -- Analyze_Task_Body_Stub --
2289 ----------------------------
2291 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2292 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2293 Loc : constant Source_Ptr := Sloc (N);
2296 Check_Stub_Level (N);
2298 -- First occurrence of name may have been as an incomplete type
2300 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2301 Nam := Full_View (Nam);
2304 if No (Nam) or else not Is_Task_Type (Etype (Nam)) then
2305 Error_Msg_N ("missing specification for task body", N);
2307 Set_Scope (Defining_Entity (N), Current_Scope);
2308 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2310 -- Check for duplicate stub, if so give message and terminate
2312 if Has_Completion (Etype (Nam)) then
2313 Error_Msg_N ("duplicate stub for task", N);
2316 Set_Has_Completion (Etype (Nam));
2319 Analyze_Proper_Body (N, Etype (Nam));
2321 -- Set elaboration flag to indicate that entity is callable. This
2322 -- cannot be done in the expansion of the body itself, because the
2323 -- proper body is not in a declarative part. This is only done if
2324 -- expansion is active, because the context may be generic and the
2325 -- flag not defined yet.
2327 if Full_Expander_Active then
2329 Make_Assignment_Statement (Loc,
2331 Make_Identifier (Loc,
2332 Chars => New_External_Name (Chars (Etype (Nam)), 'E')),
2333 Expression => New_Reference_To (Standard_True, Loc)));
2336 end Analyze_Task_Body_Stub;
2338 -------------------------
2339 -- Analyze_With_Clause --
2340 -------------------------
2342 -- Analyze the declaration of a unit in a with clause. At end, label the
2343 -- with clause with the defining entity for the unit.
2345 procedure Analyze_With_Clause (N : Node_Id) is
2347 -- Retrieve the original kind of the unit node, before analysis. If it
2348 -- is a subprogram instantiation, its analysis below will rewrite the
2349 -- node as the declaration of the wrapper package. If the same
2350 -- instantiation appears indirectly elsewhere in the context, it will
2351 -- have been analyzed already.
2353 Unit_Kind : constant Node_Kind :=
2354 Nkind (Original_Node (Unit (Library_Unit (N))));
2355 Nam : constant Node_Id := Name (N);
2357 Par_Name : Entity_Id;
2362 -- Set True if the unit currently being compiled is an internal unit
2364 Restriction_Violation : Boolean := False;
2365 -- Set True if a with violates a restriction, no point in giving any
2366 -- warnings if we have this definite error.
2368 Save_Style_Check : constant Boolean := Opt.Style_Check;
2371 U := Unit (Library_Unit (N));
2373 -- If this is an internal unit which is a renaming, then this is a
2374 -- violation of No_Obsolescent_Features.
2376 -- Note: this is not quite right if the user defines one of these units
2377 -- himself, but that's a marginal case, and fixing it is hard ???
2379 if Restriction_Check_Required (No_Obsolescent_Features) then
2381 F : constant File_Name_Type :=
2382 Unit_File_Name (Get_Source_Unit (U));
2384 if Is_Predefined_File_Name (F, Renamings_Included => True)
2386 Is_Predefined_File_Name (F, Renamings_Included => False)
2388 Check_Restriction (No_Obsolescent_Features, N);
2389 Restriction_Violation := True;
2394 -- Check No_Implementation_Units violation
2396 if Restriction_Check_Required (No_Implementation_Units) then
2397 if Not_Impl_Defined_Unit (Get_Source_Unit (U)) then
2400 Check_Restriction (No_Implementation_Units, Nam);
2401 Restriction_Violation := True;
2405 -- Several actions are skipped for dummy packages (those supplied for
2406 -- with's where no matching file could be found). Such packages are
2407 -- identified by the Sloc value being set to No_Location.
2409 if Limited_Present (N) then
2411 -- Ada 2005 (AI-50217): Build visibility structures but do not
2412 -- analyze the unit.
2414 if Sloc (U) /= No_Location then
2415 Build_Limited_Views (N);
2421 -- We reset ordinary style checking during the analysis of a with'ed
2422 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2423 -- definitely *does* apply to with'ed units).
2425 if not GNAT_Mode then
2426 Style_Check := False;
2429 -- If the library unit is a predefined unit, and we are in high
2430 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2431 -- for the analysis of the with'ed unit. This mode does not prevent
2432 -- explicit with'ing of run-time units.
2434 if Configurable_Run_Time_Mode
2435 and then Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (U)))
2437 Configurable_Run_Time_Mode := False;
2438 Semantics (Library_Unit (N));
2439 Configurable_Run_Time_Mode := True;
2442 Semantics (Library_Unit (N));
2445 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2447 if Sloc (U) /= No_Location then
2449 -- Check restrictions, except that we skip the check if this is an
2450 -- internal unit unless we are compiling the internal unit as the
2451 -- main unit. We also skip this for dummy packages.
2453 Check_Restriction_No_Dependence (Nam, N);
2455 if not Intunit or else Current_Sem_Unit = Main_Unit then
2456 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2459 -- Deal with special case of GNAT.Current_Exceptions which interacts
2460 -- with the optimization of local raise statements into gotos.
2462 if Nkind (Nam) = N_Selected_Component
2463 and then Nkind (Prefix (Nam)) = N_Identifier
2464 and then Chars (Prefix (Nam)) = Name_Gnat
2465 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2467 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2469 Check_Restriction (No_Exception_Propagation, N);
2470 Special_Exception_Package_Used := True;
2473 -- Check for inappropriate with of internal implementation unit if we
2474 -- are not compiling an internal unit and also check for withing unit
2475 -- in wrong version of Ada. Do not issue these messages for implicit
2476 -- with's generated by the compiler itself.
2478 if Implementation_Unit_Warnings
2479 and then not Intunit
2480 and then not Implicit_With (N)
2481 and then not Restriction_Violation
2484 U_Kind : constant Kind_Of_Unit :=
2485 Get_Kind_Of_Unit (Get_Source_Unit (U));
2488 if U_Kind = Implementation_Unit then
2489 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2491 -- Add alternative name if available, otherwise issue a
2492 -- general warning message.
2494 if Error_Msg_Strlen /= 0 then
2495 Error_Msg_F ("\use ""~"" instead", Name (N));
2498 ("\use of this unit is non-portable " &
2499 "and version-dependent?", Name (N));
2502 elsif U_Kind = Ada_2005_Unit
2503 and then Ada_Version < Ada_2005
2504 and then Warn_On_Ada_2005_Compatibility
2506 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2508 elsif U_Kind = Ada_2012_Unit
2509 and then Ada_Version < Ada_2012
2510 and then Warn_On_Ada_2012_Compatibility
2512 Error_Msg_N ("& is an Ada 2012 unit?", Name (N));
2518 -- Semantic analysis of a generic unit is performed on a copy of
2519 -- the original tree. Retrieve the entity on which semantic info
2520 -- actually appears.
2522 if Unit_Kind in N_Generic_Declaration then
2523 E_Name := Defining_Entity (U);
2525 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2526 -- the case of an instantiation, semantic analysis above will have
2527 -- replaced the unit by its instantiated version. If the instance body
2528 -- has been generated, the instance now denotes the body entity. For
2529 -- visibility purposes we need the entity of its spec.
2531 elsif (Unit_Kind = N_Package_Instantiation
2532 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2533 N_Package_Instantiation)
2534 and then Nkind (U) = N_Package_Body
2536 E_Name := Corresponding_Spec (U);
2538 elsif Unit_Kind = N_Package_Instantiation
2539 and then Nkind (U) = N_Package_Instantiation
2540 and then Present (Instance_Spec (U))
2542 -- If the instance has not been rewritten as a package declaration,
2543 -- then it appeared already in a previous with clause. Retrieve
2544 -- the entity from the previous instance.
2546 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2548 elsif Unit_Kind in N_Subprogram_Instantiation then
2550 -- The visible subprogram is created during instantiation, and is
2551 -- an attribute of the wrapper package. We retrieve the wrapper
2552 -- package directly from the instantiation node. If the instance
2553 -- is inlined the unit is still an instantiation. Otherwise it has
2554 -- been rewritten as the declaration of the wrapper itself.
2556 if Nkind (U) in N_Subprogram_Instantiation then
2559 (Defining_Entity (Specification (Instance_Spec (U))));
2561 E_Name := Related_Instance (Defining_Entity (U));
2564 elsif Unit_Kind = N_Package_Renaming_Declaration
2565 or else Unit_Kind in N_Generic_Renaming_Declaration
2567 E_Name := Defining_Entity (U);
2569 elsif Unit_Kind = N_Subprogram_Body
2570 and then Nkind (Name (N)) = N_Selected_Component
2571 and then not Acts_As_Spec (Library_Unit (N))
2573 -- For a child unit that has no spec, one has been created and
2574 -- analyzed. The entity required is that of the spec.
2576 E_Name := Corresponding_Spec (U);
2579 E_Name := Defining_Entity (U);
2582 if Nkind (Name (N)) = N_Selected_Component then
2584 -- Child unit in a with clause
2586 Change_Selected_Component_To_Expanded_Name (Name (N));
2588 -- If this is a child unit without a spec, and it has been analyzed
2589 -- already, a declaration has been created for it. The with_clause
2590 -- must reflect the actual body, and not the generated declaration,
2591 -- to prevent spurious binding errors involving an out-of-date spec.
2592 -- Note that this can only happen if the unit includes more than one
2593 -- with_clause for the child unit (e.g. in separate subunits).
2595 if Unit_Kind = N_Subprogram_Declaration
2596 and then Analyzed (Library_Unit (N))
2597 and then not Comes_From_Source (Library_Unit (N))
2599 Set_Library_Unit (N,
2600 Cunit (Get_Source_Unit (Corresponding_Body (U))));
2604 -- Restore style checks
2606 Style_Check := Save_Style_Check;
2608 -- Record the reference, but do NOT set the unit as referenced, we want
2609 -- to consider the unit as unreferenced if this is the only reference
2612 Set_Entity_With_Style_Check (Name (N), E_Name);
2613 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2615 -- Generate references and check No_Dependence restriction for parents
2617 if Is_Child_Unit (E_Name) then
2618 Pref := Prefix (Name (N));
2619 Par_Name := Scope (E_Name);
2620 while Nkind (Pref) = N_Selected_Component loop
2621 Change_Selected_Component_To_Expanded_Name (Pref);
2623 if Present (Entity (Selector_Name (Pref)))
2625 Present (Renamed_Entity (Entity (Selector_Name (Pref))))
2626 and then Entity (Selector_Name (Pref)) /= Par_Name
2628 -- The prefix is a child unit that denotes a renaming declaration.
2629 -- Replace the prefix directly with the renamed unit, because the
2630 -- rest of the prefix is irrelevant to the visibility of the real
2633 Rewrite (Pref, New_Occurrence_Of (Par_Name, Sloc (Pref)));
2637 Set_Entity_With_Style_Check (Pref, Par_Name);
2639 Generate_Reference (Par_Name, Pref);
2640 Check_Restriction_No_Dependence (Pref, N);
2641 Pref := Prefix (Pref);
2643 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2644 -- is set to Standard_Standard, and no attempt should be made to
2645 -- further unwind scopes.
2647 if Par_Name /= Standard_Standard then
2648 Par_Name := Scope (Par_Name);
2651 -- Abandon processing in case of previous errors
2653 if No (Par_Name) then
2654 pragma Assert (Serious_Errors_Detected /= 0);
2659 if Present (Entity (Pref))
2660 and then not Analyzed (Parent (Parent (Entity (Pref))))
2662 -- If the entity is set without its unit being compiled, the
2663 -- original parent is a renaming, and Par_Name is the renamed
2664 -- entity. For visibility purposes, we need the original entity,
2665 -- which must be analyzed now because Load_Unit directly retrieves
2666 -- the renamed unit, and the renaming declaration itself has not
2669 Analyze (Parent (Parent (Entity (Pref))));
2670 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2671 Par_Name := Entity (Pref);
2674 -- Guard against missing or misspelled child units
2676 if Present (Par_Name) then
2677 Set_Entity_With_Style_Check (Pref, Par_Name);
2678 Generate_Reference (Par_Name, Pref);
2681 pragma Assert (Serious_Errors_Detected /= 0);
2683 -- Mark the node to indicate that a related error has been posted.
2684 -- This defends further compilation passes against improper use of
2685 -- the invalid WITH clause node.
2687 Set_Error_Posted (N);
2688 Set_Name (N, Error);
2693 -- If the withed unit is System, and a system extension pragma is
2694 -- present, compile the extension now, rather than waiting for a
2695 -- visibility check on a specific entity.
2697 if Chars (E_Name) = Name_System
2698 and then Scope (E_Name) = Standard_Standard
2699 and then Present (System_Extend_Unit)
2700 and then Present_System_Aux (N)
2702 -- If the extension is not present, an error will have been emitted
2707 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2708 -- to private_with units; they will be made visible later (just before
2709 -- the private part is analyzed)
2711 if Private_Present (N) then
2712 Set_Is_Immediately_Visible (E_Name, False);
2714 end Analyze_With_Clause;
2716 ------------------------------
2717 -- Check_Private_Child_Unit --
2718 ------------------------------
2720 procedure Check_Private_Child_Unit (N : Node_Id) is
2721 Lib_Unit : constant Node_Id := Unit (N);
2723 Curr_Unit : Entity_Id;
2724 Sub_Parent : Node_Id;
2725 Priv_Child : Entity_Id;
2726 Par_Lib : Entity_Id;
2729 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2730 -- Returns true if and only if the library unit is declared with
2731 -- an explicit designation of private.
2733 -----------------------------
2734 -- Is_Private_Library_Unit --
2735 -----------------------------
2737 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2738 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2741 return Private_Present (Comp_Unit);
2742 end Is_Private_Library_Unit;
2744 -- Start of processing for Check_Private_Child_Unit
2747 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2748 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2749 Par_Lib := Curr_Unit;
2751 elsif Nkind (Lib_Unit) = N_Subunit then
2753 -- The parent is itself a body. The parent entity is to be found in
2754 -- the corresponding spec.
2756 Sub_Parent := Library_Unit (N);
2757 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2759 -- If the parent itself is a subunit, Curr_Unit is the entity of the
2760 -- enclosing body, retrieve the spec entity which is the proper
2761 -- ancestor we need for the following tests.
2763 if Ekind (Curr_Unit) = E_Package_Body then
2764 Curr_Unit := Spec_Entity (Curr_Unit);
2767 Par_Lib := Curr_Unit;
2770 Curr_Unit := Defining_Entity (Lib_Unit);
2772 Par_Lib := Curr_Unit;
2773 Par_Spec := Parent_Spec (Lib_Unit);
2775 if No (Par_Spec) then
2778 Par_Lib := Defining_Entity (Unit (Par_Spec));
2782 -- Loop through context items
2784 Item := First (Context_Items (N));
2785 while Present (Item) loop
2787 -- Ada 2005 (AI-262): Allow private_with of a private child package
2788 -- in public siblings
2790 if Nkind (Item) = N_With_Clause
2791 and then not Implicit_With (Item)
2792 and then not Limited_Present (Item)
2793 and then Is_Private_Descendant (Entity (Name (Item)))
2795 Priv_Child := Entity (Name (Item));
2798 Curr_Parent : Entity_Id := Par_Lib;
2799 Child_Parent : Entity_Id := Scope (Priv_Child);
2800 Prv_Ancestor : Entity_Id := Child_Parent;
2801 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2804 -- If the child unit is a public child then locate the nearest
2805 -- private ancestor. Child_Parent will then be set to the
2806 -- parent of that ancestor.
2808 if not Is_Private_Library_Unit (Priv_Child) then
2809 while Present (Prv_Ancestor)
2810 and then not Is_Private_Library_Unit (Prv_Ancestor)
2812 Prv_Ancestor := Scope (Prv_Ancestor);
2815 if Present (Prv_Ancestor) then
2816 Child_Parent := Scope (Prv_Ancestor);
2820 while Present (Curr_Parent)
2821 and then Curr_Parent /= Standard_Standard
2822 and then Curr_Parent /= Child_Parent
2825 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2826 Curr_Parent := Scope (Curr_Parent);
2829 if No (Curr_Parent) then
2830 Curr_Parent := Standard_Standard;
2833 if Curr_Parent /= Child_Parent then
2834 if Ekind (Priv_Child) = E_Generic_Package
2835 and then Chars (Priv_Child) in Text_IO_Package_Name
2836 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2839 ("& is a nested package, not a compilation unit",
2840 Name (Item), Priv_Child);
2844 ("unit in with clause is private child unit!", Item);
2846 ("\current unit must also have parent&!",
2847 Item, Child_Parent);
2851 or else Private_Present (Item)
2852 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2853 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2854 and then not Acts_As_Spec (Parent (Lib_Unit)))
2860 ("current unit must also be private descendant of&",
2861 Item, Child_Parent);
2869 end Check_Private_Child_Unit;
2871 ----------------------
2872 -- Check_Stub_Level --
2873 ----------------------
2875 procedure Check_Stub_Level (N : Node_Id) is
2876 Par : constant Node_Id := Parent (N);
2877 Kind : constant Node_Kind := Nkind (Par);
2880 if Nkind_In (Kind, N_Package_Body,
2884 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2888 -- In an instance, a missing stub appears at any level. A warning
2889 -- message will have been emitted already for the missing file.
2891 elsif not In_Instance then
2892 Error_Msg_N ("stub cannot appear in an inner scope", N);
2894 elsif Expander_Active then
2895 Error_Msg_N ("missing proper body", N);
2897 end Check_Stub_Level;
2899 ------------------------
2900 -- Expand_With_Clause --
2901 ------------------------
2903 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2904 Loc : constant Source_Ptr := Sloc (Nam);
2905 Ent : constant Entity_Id := Entity (Nam);
2909 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2910 -- Build name to be used in implicit with_clause. In most cases this
2911 -- is the source name, but if renamings are present we must make the
2912 -- original unit visible, not the one it renames. The entity in the
2913 -- with clause is the renamed unit, but the identifier is the one from
2914 -- the source, which allows us to recover the unit renaming.
2916 ---------------------
2917 -- Build_Unit_Name --
2918 ---------------------
2920 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2922 Renaming : Entity_Id;
2926 if Nkind (Nam) = N_Identifier then
2928 -- If the parent unit P in the name of the with_clause for P.Q is
2929 -- a renaming of package R, then the entity of the parent is set
2930 -- to R, but the identifier retains Chars (P) to be consistent
2931 -- with the source (see details in lib-load). However the implicit
2932 -- with_clause for the parent must make the entity for P visible,
2933 -- because P.Q may be used as a prefix within the current unit.
2934 -- The entity for P is the current_entity with that name, because
2935 -- the package renaming declaration for it has just been analyzed.
2936 -- Note that this case can only happen if P.Q has already appeared
2937 -- in a previous with_clause in a related unit, such as the
2938 -- library body of the current unit.
2940 if Chars (Nam) /= Chars (Entity (Nam)) then
2941 Renaming := Current_Entity (Nam);
2942 pragma Assert (Renamed_Entity (Renaming) = Entity (Nam));
2943 return New_Occurrence_Of (Renaming, Loc);
2946 return New_Occurrence_Of (Entity (Nam), Loc);
2950 Ent := Entity (Nam);
2952 if Present (Entity (Selector_Name (Nam)))
2953 and then Chars (Entity (Selector_Name (Nam))) /= Chars (Ent)
2955 Nkind (Unit_Declaration_Node (Entity (Selector_Name (Nam))))
2956 = N_Package_Renaming_Declaration
2958 -- The name in the with_clause is of the form A.B.C, and B is
2959 -- given by a renaming declaration. In that case we may not
2960 -- have analyzed the unit for B, but replaced it directly in
2961 -- lib-load with the unit it renames. We have to make A.B
2962 -- visible, so analyze the declaration for B now, in case it
2963 -- has not been done yet.
2965 Ent := Entity (Selector_Name (Nam));
2968 (Unit_Declaration_Node (Entity (Selector_Name (Nam)))));
2972 Make_Expanded_Name (Loc,
2973 Chars => Chars (Entity (Nam)),
2974 Prefix => Build_Unit_Name (Prefix (Nam)),
2975 Selector_Name => New_Occurrence_Of (Ent, Loc));
2976 Set_Entity (Result, Ent);
2979 end Build_Unit_Name;
2981 -- Start of processing for Expand_With_Clause
2984 New_Nodes_OK := New_Nodes_OK + 1;
2986 Make_With_Clause (Loc,
2987 Name => Build_Unit_Name (Nam));
2989 P := Parent (Unit_Declaration_Node (Ent));
2990 Set_Library_Unit (Withn, P);
2991 Set_Corresponding_Spec (Withn, Ent);
2992 Set_First_Name (Withn, True);
2993 Set_Implicit_With (Withn, True);
2995 -- If the unit is a package declaration, a private_with_clause on a
2996 -- child unit implies the implicit with on the parent is also private.
2998 if Nkind (Unit (N)) = N_Package_Declaration then
2999 Set_Private_Present (Withn, Private_Present (Item));
3002 Prepend (Withn, Context_Items (N));
3003 Mark_Rewrite_Insertion (Withn);
3004 Install_Withed_Unit (Withn);
3006 if Nkind (Nam) = N_Expanded_Name then
3007 Expand_With_Clause (Item, Prefix (Nam), N);
3010 New_Nodes_OK := New_Nodes_OK - 1;
3011 end Expand_With_Clause;
3013 -----------------------
3014 -- Get_Parent_Entity --
3015 -----------------------
3017 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
3019 if Nkind (Unit) = N_Package_Body
3020 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
3022 return Defining_Entity
3023 (Specification (Instance_Spec (Original_Node (Unit))));
3024 elsif Nkind (Unit) = N_Package_Instantiation then
3025 return Defining_Entity (Specification (Instance_Spec (Unit)));
3027 return Defining_Entity (Unit);
3029 end Get_Parent_Entity;
3031 ---------------------
3032 -- Has_With_Clause --
3033 ---------------------
3035 function Has_With_Clause
3038 Is_Limited : Boolean := False) return Boolean
3042 function Named_Unit (Clause : Node_Id) return Entity_Id;
3043 -- Return the entity for the unit named in a [limited] with clause
3049 function Named_Unit (Clause : Node_Id) return Entity_Id is
3051 if Nkind (Name (Clause)) = N_Selected_Component then
3052 return Entity (Selector_Name (Name (Clause)));
3054 return Entity (Name (Clause));
3058 -- Start of processing for Has_With_Clause
3061 if Present (Context_Items (C_Unit)) then
3062 Item := First (Context_Items (C_Unit));
3063 while Present (Item) loop
3064 if Nkind (Item) = N_With_Clause
3065 and then Limited_Present (Item) = Is_Limited
3066 and then Named_Unit (Item) = Pack
3076 end Has_With_Clause;
3078 -----------------------------
3079 -- Implicit_With_On_Parent --
3080 -----------------------------
3082 procedure Implicit_With_On_Parent
3083 (Child_Unit : Node_Id;
3086 Loc : constant Source_Ptr := Sloc (N);
3087 P : constant Node_Id := Parent_Spec (Child_Unit);
3088 P_Unit : Node_Id := Unit (P);
3089 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
3092 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
3093 -- Build prefix of child unit name. Recurse if needed
3095 function Build_Unit_Name return Node_Id;
3096 -- If the unit is a child unit, build qualified name with all ancestors
3098 -------------------------
3099 -- Build_Ancestor_Name --
3100 -------------------------
3102 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
3103 P_Ref : constant Node_Id :=
3104 New_Reference_To (Defining_Entity (P), Loc);
3105 P_Spec : Node_Id := P;
3108 -- Ancestor may have been rewritten as a package body. Retrieve
3109 -- the original spec to trace earlier ancestors.
3111 if Nkind (P) = N_Package_Body
3112 and then Nkind (Original_Node (P)) = N_Package_Instantiation
3114 P_Spec := Original_Node (P);
3117 if No (Parent_Spec (P_Spec)) then
3121 Make_Selected_Component (Loc,
3122 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
3123 Selector_Name => P_Ref);
3125 end Build_Ancestor_Name;
3127 ---------------------
3128 -- Build_Unit_Name --
3129 ---------------------
3131 function Build_Unit_Name return Node_Id is
3135 if No (Parent_Spec (P_Unit)) then
3136 return New_Reference_To (P_Name, Loc);
3140 Make_Expanded_Name (Loc,
3141 Chars => Chars (P_Name),
3142 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
3143 Selector_Name => New_Reference_To (P_Name, Loc));
3144 Set_Entity (Result, P_Name);
3147 end Build_Unit_Name;
3149 -- Start of processing for Implicit_With_On_Parent
3152 -- The unit of the current compilation may be a package body that
3153 -- replaces an instance node. In this case we need the original instance
3154 -- node to construct the proper parent name.
3156 if Nkind (P_Unit) = N_Package_Body
3157 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
3159 P_Unit := Original_Node (P_Unit);
3162 -- We add the implicit with if the child unit is the current unit being
3163 -- compiled. If the current unit is a body, we do not want to add an
3164 -- implicit_with a second time to the corresponding spec.
3166 if Nkind (Child_Unit) = N_Package_Declaration
3167 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
3172 New_Nodes_OK := New_Nodes_OK + 1;
3173 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
3175 Set_Library_Unit (Withn, P);
3176 Set_Corresponding_Spec (Withn, P_Name);
3177 Set_First_Name (Withn, True);
3178 Set_Implicit_With (Withn, True);
3180 -- Node is placed at the beginning of the context items, so that
3181 -- subsequent use clauses on the parent can be validated.
3183 Prepend (Withn, Context_Items (N));
3184 Mark_Rewrite_Insertion (Withn);
3185 Install_Withed_Unit (Withn);
3187 if Is_Child_Spec (P_Unit) then
3188 Implicit_With_On_Parent (P_Unit, N);
3191 New_Nodes_OK := New_Nodes_OK - 1;
3192 end Implicit_With_On_Parent;
3198 function In_Chain (E : Entity_Id) return Boolean is
3202 H := Current_Entity (E);
3203 while Present (H) loop
3214 ---------------------
3215 -- Install_Context --
3216 ---------------------
3218 procedure Install_Context (N : Node_Id) is
3219 Lib_Unit : constant Node_Id := Unit (N);
3222 Install_Context_Clauses (N);
3224 if Is_Child_Spec (Lib_Unit) then
3225 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
3228 Install_Limited_Context_Clauses (N);
3229 end Install_Context;
3231 -----------------------------
3232 -- Install_Context_Clauses --
3233 -----------------------------
3235 procedure Install_Context_Clauses (N : Node_Id) is
3236 Lib_Unit : constant Node_Id := Unit (N);
3238 Uname_Node : Entity_Id;
3239 Check_Private : Boolean := False;
3240 Decl_Node : Node_Id;
3241 Lib_Parent : Entity_Id;
3244 -- First skip configuration pragmas at the start of the context. They
3245 -- are not technically part of the context clause, but that's where the
3246 -- parser puts them. Note they were analyzed in Analyze_Context.
3248 Item := First (Context_Items (N));
3249 while Present (Item)
3250 and then Nkind (Item) = N_Pragma
3251 and then Pragma_Name (Item) in Configuration_Pragma_Names
3256 -- Loop through the actual context clause items. We process everything
3257 -- except Limited_With clauses in this routine. Limited_With clauses
3258 -- are separately installed (see Install_Limited_Context_Clauses).
3260 while Present (Item) loop
3262 -- Case of explicit WITH clause
3264 if Nkind (Item) = N_With_Clause
3265 and then not Implicit_With (Item)
3267 if Limited_Present (Item) then
3269 -- Limited withed units will be installed later
3273 -- If Name (Item) is not an entity name, something is wrong, and
3274 -- this will be detected in due course, for now ignore the item
3276 elsif not Is_Entity_Name (Name (Item)) then
3279 elsif No (Entity (Name (Item))) then
3280 Set_Entity (Name (Item), Any_Id);
3284 Uname_Node := Entity (Name (Item));
3286 if Is_Private_Descendant (Uname_Node) then
3287 Check_Private := True;
3290 Install_Withed_Unit (Item);
3292 Decl_Node := Unit_Declaration_Node (Uname_Node);
3294 -- If the unit is a subprogram instance, it appears nested within
3295 -- a package that carries the parent information.
3297 if Is_Generic_Instance (Uname_Node)
3298 and then Ekind (Uname_Node) /= E_Package
3300 Decl_Node := Parent (Parent (Decl_Node));
3303 if Is_Child_Spec (Decl_Node) then
3304 if Nkind (Name (Item)) = N_Expanded_Name then
3305 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3307 -- If not an expanded name, the child unit must be a
3308 -- renaming, nothing to do.
3313 elsif Nkind (Decl_Node) = N_Subprogram_Body
3314 and then not Acts_As_Spec (Parent (Decl_Node))
3315 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3317 Implicit_With_On_Parent
3318 (Unit (Library_Unit (Parent (Decl_Node))), N);
3321 -- Check license conditions unless this is a dummy unit
3323 if Sloc (Library_Unit (Item)) /= No_Location then
3324 License_Check : declare
3325 Withu : constant Unit_Number_Type :=
3326 Get_Source_Unit (Library_Unit (Item));
3327 Withl : constant License_Type :=
3328 License (Source_Index (Withu));
3329 Unitl : constant License_Type :=
3330 License (Source_Index (Current_Sem_Unit));
3332 procedure License_Error;
3333 -- Signal error of bad license
3339 procedure License_Error is
3342 ("?license of with'ed unit & may be inconsistent",
3346 -- Start of processing for License_Check
3349 -- Exclude license check if withed unit is an internal unit.
3350 -- This situation arises e.g. with the GPL version of GNAT.
3352 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3355 -- Otherwise check various cases
3367 if Withl = Restricted then
3371 when Modified_GPL =>
3372 if Withl = Restricted or else Withl = GPL then
3376 when Unrestricted =>
3383 -- Case of USE PACKAGE clause
3385 elsif Nkind (Item) = N_Use_Package_Clause then
3386 Analyze_Use_Package (Item);
3388 -- Case of USE TYPE clause
3390 elsif Nkind (Item) = N_Use_Type_Clause then
3391 Analyze_Use_Type (Item);
3395 elsif Nkind (Item) = N_Pragma then
3403 if Is_Child_Spec (Lib_Unit) then
3405 -- The unit also has implicit with_clauses on its own parents
3407 if No (Context_Items (N)) then
3408 Set_Context_Items (N, New_List);
3411 Implicit_With_On_Parent (Lib_Unit, N);
3414 -- If the unit is a body, the context of the specification must also
3415 -- be installed. That includes private with_clauses in that context.
3417 if Nkind (Lib_Unit) = N_Package_Body
3418 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3419 and then not Acts_As_Spec (N))
3421 Install_Context (Library_Unit (N));
3423 -- Only install private with-clauses of a spec that comes from
3424 -- source, excluding specs created for a subprogram body that is
3427 if Comes_From_Source (Library_Unit (N)) then
3428 Install_Private_With_Clauses
3429 (Defining_Entity (Unit (Library_Unit (N))));
3432 if Is_Child_Spec (Unit (Library_Unit (N))) then
3434 -- If the unit is the body of a public child unit, the private
3435 -- declarations of the parent must be made visible. If the child
3436 -- unit is private, the private declarations have been installed
3437 -- already in the call to Install_Parents for the spec. Installing
3438 -- private declarations must be done for all ancestors of public
3439 -- child units. In addition, sibling units mentioned in the
3440 -- context clause of the body are directly visible.
3448 Lib_Spec := Unit (Library_Unit (N));
3449 while Is_Child_Spec (Lib_Spec) loop
3450 P := Unit (Parent_Spec (Lib_Spec));
3451 P_Name := Defining_Entity (P);
3453 if not (Private_Present (Parent (Lib_Spec)))
3454 and then not In_Private_Part (P_Name)
3456 Install_Private_Declarations (P_Name);
3457 Install_Private_With_Clauses (P_Name);
3458 Set_Use (Private_Declarations (Specification (P)));
3466 -- For a package body, children in context are immediately visible
3468 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3471 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3472 N_Generic_Subprogram_Declaration,
3473 N_Package_Declaration,
3474 N_Subprogram_Declaration)
3476 if Is_Child_Spec (Lib_Unit) then
3477 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3478 Set_Is_Private_Descendant
3479 (Defining_Entity (Lib_Unit),
3480 Is_Private_Descendant (Lib_Parent)
3481 or else Private_Present (Parent (Lib_Unit)));
3484 Set_Is_Private_Descendant
3485 (Defining_Entity (Lib_Unit),
3486 Private_Present (Parent (Lib_Unit)));
3490 if Check_Private then
3491 Check_Private_Child_Unit (N);
3493 end Install_Context_Clauses;
3495 -------------------------------------
3496 -- Install_Limited_Context_Clauses --
3497 -------------------------------------
3499 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3502 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3503 -- Check that the unlimited view of a given compilation_unit is not
3504 -- already visible through "use + renamings".
3506 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3507 -- Check that if a limited_with clause of a given compilation_unit
3508 -- mentions a descendant of a private child of some library unit, then
3509 -- the given compilation_unit shall be the declaration of a private
3510 -- descendant of that library unit, or a public descendant of such. The
3511 -- code is analogous to that of Check_Private_Child_Unit but we cannot
3512 -- use entities on the limited with_clauses because their units have not
3513 -- been analyzed, so we have to climb the tree of ancestors looking for
3514 -- private keywords.
3516 procedure Expand_Limited_With_Clause
3517 (Comp_Unit : Node_Id;
3520 -- If a child unit appears in a limited_with clause, there are implicit
3521 -- limited_with clauses on all parents that are not already visible
3522 -- through a regular with clause. This procedure creates the implicit
3523 -- limited with_clauses for the parents and loads the corresponding
3524 -- units. The shadow entities are created when the inserted clause is
3525 -- analyzed. Implements Ada 2005 (AI-50217).
3527 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean;
3528 -- When compiling a unit Q descended from some parent unit P, a limited
3529 -- with_clause in the context of P that names some other ancestor of Q
3530 -- must not be installed because the ancestor is immediately visible.
3532 ---------------------
3533 -- Check_Renamings --
3534 ---------------------
3536 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3545 pragma Assert (Nkind (W) = N_With_Clause);
3547 -- Protect the frontend against previous critical errors
3549 case Nkind (Unit (Library_Unit (W))) is
3550 when N_Subprogram_Declaration |
3551 N_Package_Declaration |
3552 N_Generic_Subprogram_Declaration |
3553 N_Generic_Package_Declaration =>
3560 -- Check "use + renamings"
3562 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3563 Spec := Specification (Unit (P));
3565 Item := First (Visible_Declarations (Spec));
3566 while Present (Item) loop
3568 -- Look only at use package clauses
3570 if Nkind (Item) = N_Use_Package_Clause then
3572 -- Traverse the list of packages
3574 Nam := First (Names (Item));
3575 while Present (Nam) loop
3578 pragma Assert (Present (Parent (E)));
3580 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3581 and then Renamed_Entity (E) = WEnt
3583 -- The unlimited view is visible through use clause and
3584 -- renamings. There is no need to generate the error
3585 -- message here because Is_Visible_Through_Renamings
3586 -- takes care of generating the precise error message.
3590 elsif Nkind (Parent (E)) = N_Package_Specification then
3592 -- The use clause may refer to a local package.
3593 -- Check all the enclosing scopes.
3596 while E2 /= Standard_Standard
3604 ("unlimited view visible through use clause ", W);
3616 -- Recursive call to check all the ancestors
3618 if Is_Child_Spec (Unit (P)) then
3619 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3621 end Check_Renamings;
3623 ---------------------------------------
3624 -- Check_Private_Limited_Withed_Unit --
3625 ---------------------------------------
3627 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3628 Curr_Parent : Node_Id;
3629 Child_Parent : Node_Id;
3630 Curr_Private : Boolean;
3633 -- Compilation unit of the parent of the withed library unit
3635 Child_Parent := Library_Unit (Item);
3637 -- If the child unit is a public child, then locate its nearest
3638 -- private ancestor, if any, then Child_Parent will then be set to
3639 -- the parent of that ancestor.
3641 if not Private_Present (Library_Unit (Item)) then
3642 while Present (Child_Parent)
3643 and then not Private_Present (Child_Parent)
3645 Child_Parent := Parent_Spec (Unit (Child_Parent));
3648 if No (Child_Parent) then
3653 Child_Parent := Parent_Spec (Unit (Child_Parent));
3655 -- Traverse all the ancestors of the current compilation unit to
3656 -- check if it is a descendant of named library unit.
3658 Curr_Parent := Parent (Item);
3659 Curr_Private := Private_Present (Curr_Parent);
3661 while Present (Parent_Spec (Unit (Curr_Parent)))
3662 and then Curr_Parent /= Child_Parent
3664 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3665 Curr_Private := Curr_Private or else Private_Present (Curr_Parent);
3668 if Curr_Parent /= Child_Parent then
3670 ("unit in with clause is private child unit!", Item);
3672 ("\current unit must also have parent&!",
3673 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3675 elsif Private_Present (Parent (Item))
3676 or else Curr_Private
3677 or else Private_Present (Item)
3678 or else Nkind_In (Unit (Parent (Item)), N_Package_Body,
3682 -- Current unit is private, of descendant of a private unit
3688 ("current unit must also be private descendant of&",
3689 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3691 end Check_Private_Limited_Withed_Unit;
3693 --------------------------------
3694 -- Expand_Limited_With_Clause --
3695 --------------------------------
3697 procedure Expand_Limited_With_Clause
3698 (Comp_Unit : Node_Id;
3702 Loc : constant Source_Ptr := Sloc (Nam);
3703 Unum : Unit_Number_Type;
3706 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3707 -- Returns true if the context already includes a with_clause for
3708 -- this unit. If the with_clause is non-limited, the unit is fully
3709 -- visible and an implicit limited_with should not be created. If
3710 -- there is already a limited_with clause for W, a second one is
3711 -- simply redundant.
3713 --------------------------
3714 -- Previous_Withed_Unit --
3715 --------------------------
3717 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3721 -- A limited with_clause cannot appear in the same context_clause
3722 -- as a nonlimited with_clause which mentions the same library.
3724 Item := First (Context_Items (Comp_Unit));
3725 while Present (Item) loop
3726 if Nkind (Item) = N_With_Clause
3727 and then Library_Unit (Item) = Library_Unit (W)
3736 end Previous_Withed_Unit;
3738 -- Start of processing for Expand_Limited_With_Clause
3741 New_Nodes_OK := New_Nodes_OK + 1;
3743 if Nkind (Nam) = N_Identifier then
3745 -- Create node for name of withed unit
3748 Make_With_Clause (Loc,
3749 Name => New_Copy (Nam));
3751 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3753 Make_With_Clause (Loc,
3754 Name => Make_Selected_Component (Loc,
3755 Prefix => New_Copy_Tree (Prefix (Nam)),
3756 Selector_Name => New_Copy (Selector_Name (Nam))));
3757 Set_Parent (Withn, Parent (N));
3760 Set_Limited_Present (Withn);
3761 Set_First_Name (Withn);
3762 Set_Implicit_With (Withn);
3766 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3771 -- Do not generate a limited_with_clause on the current unit. This
3772 -- path is taken when a unit has a limited_with clause on one of its
3775 if Unum = Current_Sem_Unit then
3779 Set_Library_Unit (Withn, Cunit (Unum));
3780 Set_Corresponding_Spec
3781 (Withn, Specification (Unit (Cunit (Unum))));
3783 if not Previous_Withed_Unit (Withn) then
3784 Prepend (Withn, Context_Items (Parent (N)));
3785 Mark_Rewrite_Insertion (Withn);
3787 -- Add implicit limited_with_clauses for parents of child units
3788 -- mentioned in limited_with clauses.
3790 if Nkind (Nam) = N_Selected_Component then
3791 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3796 if not Limited_View_Installed (Withn) then
3797 Install_Limited_Withed_Unit (Withn);
3801 New_Nodes_OK := New_Nodes_OK - 1;
3802 end Expand_Limited_With_Clause;
3804 ----------------------
3805 -- Is_Ancestor_Unit --
3806 ----------------------
3808 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean is
3809 E1 : constant Entity_Id := Defining_Entity (Unit (U1));
3812 if Nkind_In (Unit (U2), N_Package_Body, N_Subprogram_Body) then
3813 E2 := Defining_Entity (Unit (Library_Unit (U2)));
3814 return Is_Ancestor_Package (E1, E2);
3818 end Is_Ancestor_Unit;
3820 -- Start of processing for Install_Limited_Context_Clauses
3823 Item := First (Context_Items (N));
3824 while Present (Item) loop
3825 if Nkind (Item) = N_With_Clause
3826 and then Limited_Present (Item)
3827 and then not Error_Posted (Item)
3829 if Nkind (Name (Item)) = N_Selected_Component then
3830 Expand_Limited_With_Clause
3831 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3834 Check_Private_Limited_Withed_Unit (Item);
3836 if not Implicit_With (Item)
3837 and then Is_Child_Spec (Unit (N))
3839 Check_Renamings (Parent_Spec (Unit (N)), Item);
3842 -- A unit may have a limited with on itself if it has a limited
3843 -- with_clause on one of its child units. In that case it is
3844 -- already being compiled and it makes no sense to install its
3847 -- If the item is a limited_private_with_clause, install it if the
3848 -- current unit is a body or if it is a private child. Otherwise
3849 -- the private clause is installed before analyzing the private
3850 -- part of the current unit.
3852 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3853 and then not Limited_View_Installed (Item)
3855 not Is_Ancestor_Unit
3856 (Library_Unit (Item), Cunit (Current_Sem_Unit))
3858 if not Private_Present (Item)
3859 or else Private_Present (N)
3860 or else Nkind_In (Unit (N), N_Package_Body,
3864 Install_Limited_Withed_Unit (Item);
3872 -- Ada 2005 (AI-412): Examine visible declarations of a package spec,
3873 -- looking for incomplete subtype declarations of incomplete types
3874 -- visible through a limited with clause.
3876 if Ada_Version >= Ada_2005
3877 and then Analyzed (N)
3878 and then Nkind (Unit (N)) = N_Package_Declaration
3883 Non_Lim_View : Entity_Id;
3886 Decl := First (Visible_Declarations (Specification (Unit (N))));
3887 while Present (Decl) loop
3888 if Nkind (Decl) = N_Subtype_Declaration
3890 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3892 From_With_Type (Defining_Identifier (Decl))
3894 Def_Id := Defining_Identifier (Decl);
3895 Non_Lim_View := Non_Limited_View (Def_Id);
3897 if not Is_Incomplete_Type (Non_Lim_View) then
3899 -- Convert an incomplete subtype declaration into a
3900 -- corresponding non-limited view subtype declaration.
3901 -- This is usually the case when analyzing a body that
3902 -- has regular with clauses, when the spec has limited
3905 -- If the non-limited view is still incomplete, it is
3906 -- the dummy entry already created, and the declaration
3907 -- cannot be reanalyzed. This is the case when installing
3908 -- a parent unit that has limited with-clauses.
3910 Set_Subtype_Indication (Decl,
3911 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3912 Set_Etype (Def_Id, Non_Lim_View);
3913 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3914 Set_Analyzed (Decl, False);
3916 -- Reanalyze the declaration, suppressing the call to
3917 -- Enter_Name to avoid duplicate names.
3919 Analyze_Subtype_Declaration
3929 end Install_Limited_Context_Clauses;
3931 ---------------------
3932 -- Install_Parents --
3933 ---------------------
3935 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3942 P := Unit (Parent_Spec (Lib_Unit));
3943 P_Name := Get_Parent_Entity (P);
3945 if Etype (P_Name) = Any_Type then
3949 if Ekind (P_Name) = E_Generic_Package
3950 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3951 N_Generic_Package_Declaration)
3952 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3955 ("child of a generic package must be a generic unit", Lib_Unit);
3957 elsif not Is_Package_Or_Generic_Package (P_Name) then
3959 ("parent unit must be package or generic package", Lib_Unit);
3960 raise Unrecoverable_Error;
3962 elsif Present (Renamed_Object (P_Name)) then
3963 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3964 raise Unrecoverable_Error;
3966 -- Verify that a child of an instance is itself an instance, or the
3967 -- renaming of one. Given that an instance that is a unit is replaced
3968 -- with a package declaration, check against the original node. The
3969 -- parent may be currently being instantiated, in which case it appears
3970 -- as a declaration, but the generic_parent is already established
3971 -- indicating that we deal with an instance.
3973 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3974 if Nkind (Lib_Unit) in N_Renaming_Declaration
3975 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3977 (Nkind (Lib_Unit) = N_Package_Declaration
3978 and then Present (Generic_Parent (Specification (Lib_Unit))))
3983 ("child of an instance must be an instance or renaming",
3988 -- This is the recursive call that ensures all parents are loaded
3990 if Is_Child_Spec (P) then
3992 Is_Private or else Private_Present (Parent (Lib_Unit)));
3995 -- Now we can install the context for this parent
3997 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3998 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3999 Install_Siblings (P_Name, Parent (Lib_Unit));
4001 -- The child unit is in the declarative region of the parent. The parent
4002 -- must therefore appear in the scope stack and be visible, as when
4003 -- compiling the corresponding body. If the child unit is private or it
4004 -- is a package body, private declarations must be accessible as well.
4005 -- Use declarations in the parent must also be installed. Finally, other
4006 -- child units of the same parent that are in the context are
4007 -- immediately visible.
4009 -- Find entity for compilation unit, and set its private descendant
4010 -- status as needed. Indicate that it is a compilation unit, which is
4011 -- redundant in general, but needed if this is a generated child spec
4012 -- for a child body without previous spec.
4014 E_Name := Defining_Entity (Lib_Unit);
4016 Set_Is_Child_Unit (E_Name);
4017 Set_Is_Compilation_Unit (E_Name);
4019 Set_Is_Private_Descendant (E_Name,
4020 Is_Private_Descendant (P_Name)
4021 or else Private_Present (Parent (Lib_Unit)));
4023 P_Spec := Specification (Unit_Declaration_Node (P_Name));
4024 Push_Scope (P_Name);
4026 -- Save current visibility of unit
4028 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
4029 Is_Immediately_Visible (P_Name);
4030 Set_Is_Immediately_Visible (P_Name);
4031 Install_Visible_Declarations (P_Name);
4032 Set_Use (Visible_Declarations (P_Spec));
4034 -- If the parent is a generic unit, its formal part may contain formal
4035 -- packages and use clauses for them.
4037 if Ekind (P_Name) = E_Generic_Package then
4038 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
4042 or else Private_Present (Parent (Lib_Unit))
4044 Install_Private_Declarations (P_Name);
4045 Install_Private_With_Clauses (P_Name);
4046 Set_Use (Private_Declarations (P_Spec));
4048 end Install_Parents;
4050 ----------------------------------
4051 -- Install_Private_With_Clauses --
4052 ----------------------------------
4054 procedure Install_Private_With_Clauses (P : Entity_Id) is
4055 Decl : constant Node_Id := Unit_Declaration_Node (P);
4059 if Debug_Flag_I then
4060 Write_Str ("install private with clauses of ");
4061 Write_Name (Chars (P));
4065 if Nkind (Parent (Decl)) = N_Compilation_Unit then
4066 Item := First (Context_Items (Parent (Decl)));
4067 while Present (Item) loop
4068 if Nkind (Item) = N_With_Clause
4069 and then Private_Present (Item)
4071 if Limited_Present (Item) then
4072 if not Limited_View_Installed (Item) then
4073 Install_Limited_Withed_Unit (Item);
4076 Install_Withed_Unit (Item, Private_With_OK => True);
4083 end Install_Private_With_Clauses;
4085 ----------------------
4086 -- Install_Siblings --
4087 ----------------------
4089 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
4095 -- Iterate over explicit with clauses, and check whether the scope of
4096 -- each entity is an ancestor of the current unit, in which case it is
4097 -- immediately visible.
4099 Item := First (Context_Items (N));
4100 while Present (Item) loop
4102 -- Do not install private_with_clauses declaration, unless unit
4103 -- is itself a private child unit, or is a body. Note that for a
4104 -- subprogram body the private_with_clause does not take effect until
4105 -- after the specification.
4107 if Nkind (Item) /= N_With_Clause
4108 or else Implicit_With (Item)
4109 or else Limited_Present (Item)
4110 or else Error_Posted (Item)
4114 elsif not Private_Present (Item)
4115 or else Private_Present (N)
4116 or else Nkind (Unit (N)) = N_Package_Body
4118 Id := Entity (Name (Item));
4120 if Is_Child_Unit (Id)
4121 and then Is_Ancestor_Package (Scope (Id), U_Name)
4123 Set_Is_Immediately_Visible (Id);
4125 -- Check for the presence of another unit in the context that
4126 -- may be inadvertently hidden by the child.
4128 Prev := Current_Entity (Id);
4131 and then Is_Immediately_Visible (Prev)
4132 and then not Is_Child_Unit (Prev)
4138 Clause := First (Context_Items (N));
4139 while Present (Clause) loop
4140 if Nkind (Clause) = N_With_Clause
4141 and then Entity (Name (Clause)) = Prev
4144 ("child unit& hides compilation unit " &
4145 "with the same name?",
4155 -- The With_Clause may be on a grand-child or one of its further
4156 -- descendants, which makes a child immediately visible. Examine
4157 -- ancestry to determine whether such a child exists. For example,
4158 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
4159 -- is immediately visible.
4161 elsif Is_Child_Unit (Id) then
4167 while Is_Child_Unit (Par) loop
4168 if Is_Ancestor_Package (Scope (Par), U_Name) then
4169 Set_Is_Immediately_Visible (Par);
4178 -- If the item is a private with-clause on a child unit, the parent
4179 -- may have been installed already, but the child unit must remain
4180 -- invisible until installed in a private part or body, unless there
4181 -- is already a regular with_clause for it in the current unit.
4183 elsif Private_Present (Item) then
4184 Id := Entity (Name (Item));
4186 if Is_Child_Unit (Id) then
4190 function In_Context return Boolean;
4191 -- Scan context of current unit, to check whether there is
4192 -- a with_clause on the same unit as a private with-clause
4193 -- on a parent, in which case child unit is visible. If the
4194 -- unit is a grand-child, the same applies to its parent.
4200 function In_Context return Boolean is
4203 First (Context_Items (Cunit (Current_Sem_Unit)));
4204 while Present (Clause) loop
4205 if Nkind (Clause) = N_With_Clause
4206 and then Comes_From_Source (Clause)
4207 and then Is_Entity_Name (Name (Clause))
4208 and then not Private_Present (Clause)
4210 if Entity (Name (Clause)) = Id
4212 (Nkind (Name (Clause)) = N_Expanded_Name
4213 and then Entity (Prefix (Name (Clause))) = Id)
4226 Set_Is_Visible_Child_Unit (Id, In_Context);
4233 end Install_Siblings;
4235 ---------------------------------
4236 -- Install_Limited_Withed_Unit --
4237 ---------------------------------
4239 procedure Install_Limited_Withed_Unit (N : Node_Id) is
4240 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
4243 Is_Child_Package : Boolean := False;
4244 Lim_Header : Entity_Id;
4245 Lim_Typ : Entity_Id;
4247 procedure Check_Body_Required;
4248 -- A unit mentioned in a limited with_clause may not be mentioned in
4249 -- a regular with_clause, but must still be included in the current
4250 -- partition. We need to determine whether the unit needs a body, so
4251 -- that the binder can determine the name of the file to be compiled.
4252 -- Checking whether a unit needs a body can be done without semantic
4253 -- analysis, by examining the nature of the declarations in the package.
4255 function Has_Limited_With_Clause
4256 (C_Unit : Entity_Id;
4257 Pack : Entity_Id) return Boolean;
4258 -- Determine whether any package in the ancestor chain starting with
4259 -- C_Unit has a limited with clause for package Pack.
4261 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
4262 -- Check if some package installed though normal with-clauses has a
4263 -- renaming declaration of package P. AARM 10.1.2(21/2).
4265 -------------------------
4266 -- Check_Body_Required --
4267 -------------------------
4269 procedure Check_Body_Required is
4270 PA : constant List_Id :=
4271 Pragmas_After (Aux_Decls_Node (Parent (P_Unit)));
4273 procedure Check_Declarations (Spec : Node_Id);
4274 -- Recursive procedure that does the work and checks nested packages
4276 ------------------------
4277 -- Check_Declarations --
4278 ------------------------
4280 procedure Check_Declarations (Spec : Node_Id) is
4282 Incomplete_Decls : constant Elist_Id := New_Elmt_List;
4284 Subp_List : constant Elist_Id := New_Elmt_List;
4286 procedure Check_Pragma_Import (P : Node_Id);
4287 -- If a pragma import applies to a previous subprogram, the
4288 -- enclosing unit may not need a body. The processing is syntactic
4289 -- and does not require a declaration to be analyzed. The code
4290 -- below also handles pragma Import when applied to a subprogram
4291 -- that renames another. In this case the pragma applies to the
4294 -- Chains of multiple renames are not handled by the code below.
4295 -- It is probably impossible to handle all cases without proper
4296 -- name resolution. In such cases the algorithm is conservative
4297 -- and will indicate that a body is needed???
4299 -------------------------
4300 -- Check_Pragma_Import --
4301 -------------------------
4303 procedure Check_Pragma_Import (P : Node_Id) is
4309 procedure Remove_Homonyms (E : Node_Id);
4310 -- Make one pass over list of subprograms. Called again if
4311 -- subprogram is a renaming. E is known to be an identifier.
4313 ---------------------
4314 -- Remove_Homonyms --
4315 ---------------------
4317 procedure Remove_Homonyms (E : Node_Id) is
4318 R : Entity_Id := Empty;
4319 -- Name of renamed entity, if any
4322 Subp_Id := First_Elmt (Subp_List);
4323 while Present (Subp_Id) loop
4324 if Chars (Node (Subp_Id)) = Chars (E) then
4325 if Nkind (Parent (Parent (Node (Subp_Id))))
4326 /= N_Subprogram_Renaming_Declaration
4329 Next_Elmt (Subp_Id);
4330 Remove_Elmt (Subp_List, Prev_Id);
4332 R := Name (Parent (Parent (Node (Subp_Id))));
4336 Next_Elmt (Subp_Id);
4341 if Nkind (R) = N_Identifier then
4342 Remove_Homonyms (R);
4344 elsif Nkind (R) = N_Selected_Component then
4345 Remove_Homonyms (Selector_Name (R));
4347 -- Renaming of attribute
4353 end Remove_Homonyms;
4355 -- Start of processing for Check_Pragma_Import
4358 -- Find name of entity in Import pragma. We have not analyzed
4359 -- the construct, so we must guard against syntax errors.
4361 Arg := Next (First (Pragma_Argument_Associations (P)));
4364 or else Nkind (Expression (Arg)) /= N_Identifier
4368 Imported := Expression (Arg);
4371 Remove_Homonyms (Imported);
4372 end Check_Pragma_Import;
4374 -- Start of processing for Check_Declarations
4377 -- Search for Elaborate Body pragma
4379 Decl := First (Visible_Declarations (Spec));
4380 while Present (Decl)
4381 and then Nkind (Decl) = N_Pragma
4383 if Get_Pragma_Id (Decl) = Pragma_Elaborate_Body then
4384 Set_Body_Required (Library_Unit (N));
4391 -- Look for declarations that require the presence of a body. We
4392 -- have already skipped pragmas at the start of the list.
4394 while Present (Decl) loop
4396 -- Subprogram that comes from source means body may be needed.
4397 -- Save for subsequent examination of import pragmas.
4399 if Comes_From_Source (Decl)
4400 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4401 N_Subprogram_Renaming_Declaration,
4402 N_Generic_Subprogram_Declaration))
4404 Append_Elmt (Defining_Entity (Decl), Subp_List);
4406 -- Package declaration of generic package declaration. We need
4407 -- to recursively examine nested declarations.
4409 elsif Nkind_In (Decl, N_Package_Declaration,
4410 N_Generic_Package_Declaration)
4412 Check_Declarations (Specification (Decl));
4414 elsif Nkind (Decl) = N_Pragma
4415 and then Pragma_Name (Decl) = Name_Import
4417 Check_Pragma_Import (Decl);
4423 -- Same set of tests for private part. In addition to subprograms
4424 -- detect the presence of Taft Amendment types (incomplete types
4425 -- completed in the body).
4427 Decl := First (Private_Declarations (Spec));
4428 while Present (Decl) loop
4429 if Comes_From_Source (Decl)
4430 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4431 N_Subprogram_Renaming_Declaration,
4432 N_Generic_Subprogram_Declaration))
4434 Append_Elmt (Defining_Entity (Decl), Subp_List);
4436 elsif Nkind_In (Decl, N_Package_Declaration,
4437 N_Generic_Package_Declaration)
4439 Check_Declarations (Specification (Decl));
4441 -- Collect incomplete type declarations for separate pass
4443 elsif Nkind (Decl) = N_Incomplete_Type_Declaration then
4444 Append_Elmt (Decl, Incomplete_Decls);
4446 elsif Nkind (Decl) = N_Pragma
4447 and then Pragma_Name (Decl) = Name_Import
4449 Check_Pragma_Import (Decl);
4455 -- Now check incomplete declarations to locate Taft amendment
4456 -- types. This can be done by examining the defining identifiers
4457 -- of type declarations without real semantic analysis.
4463 Inc := First_Elmt (Incomplete_Decls);
4464 while Present (Inc) loop
4465 Decl := Next (Node (Inc));
4466 while Present (Decl) loop
4467 if Nkind (Decl) = N_Full_Type_Declaration
4468 and then Chars (Defining_Identifier (Decl)) =
4469 Chars (Defining_Identifier (Node (Inc)))
4477 -- If no completion, this is a TAT, and a body is needed
4480 Set_Body_Required (Library_Unit (N));
4488 -- Finally, check whether there are subprograms that still require
4489 -- a body, i.e. are not renamings or null.
4491 if not Is_Empty_Elmt_List (Subp_List) then
4497 Subp_Id := First_Elmt (Subp_List);
4498 Spec := Parent (Node (Subp_Id));
4500 while Present (Subp_Id) loop
4501 if Nkind (Parent (Spec))
4502 = N_Subprogram_Renaming_Declaration
4506 elsif Nkind (Spec) = N_Procedure_Specification
4507 and then Null_Present (Spec)
4512 Set_Body_Required (Library_Unit (N));
4516 Next_Elmt (Subp_Id);
4520 end Check_Declarations;
4522 -- Start of processing for Check_Body_Required
4525 -- If this is an imported package (Java and CIL usage) no body is
4526 -- needed. Scan list of pragmas that may follow a compilation unit
4527 -- to look for a relevant pragma Import.
4529 if Present (PA) then
4535 while Present (Prag) loop
4536 if Nkind (Prag) = N_Pragma
4537 and then Get_Pragma_Id (Prag) = Pragma_Import
4547 Check_Declarations (Specification (P_Unit));
4548 end Check_Body_Required;
4550 -----------------------------
4551 -- Has_Limited_With_Clause --
4552 -----------------------------
4554 function Has_Limited_With_Clause
4555 (C_Unit : Entity_Id;
4556 Pack : Entity_Id) return Boolean
4563 while Present (Par) loop
4564 if Ekind (Par) /= E_Package then
4568 -- Retrieve the Compilation_Unit node for Par and determine if
4569 -- its context clauses contain a limited with for Pack.
4571 Par_Unit := Parent (Parent (Parent (Par)));
4573 if Nkind (Par_Unit) = N_Package_Declaration then
4574 Par_Unit := Parent (Par_Unit);
4577 if Has_With_Clause (Par_Unit, Pack, True) then
4581 -- If there are more ancestors, climb up the tree, otherwise we
4584 if Is_Child_Unit (Par) then
4592 end Has_Limited_With_Clause;
4594 ----------------------------------
4595 -- Is_Visible_Through_Renamings --
4596 ----------------------------------
4598 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4599 Kind : constant Node_Kind :=
4600 Nkind (Unit (Cunit (Current_Sem_Unit)));
4606 -- Example of the error detected by this subprogram:
4614 -- package Ren_P renames P;
4620 -- limited with P; -- ERROR
4621 -- package R.C is ...
4623 Aux_Unit := Cunit (Current_Sem_Unit);
4626 Item := First (Context_Items (Aux_Unit));
4627 while Present (Item) loop
4628 if Nkind (Item) = N_With_Clause
4629 and then not Limited_Present (Item)
4630 and then Nkind (Unit (Library_Unit (Item))) =
4631 N_Package_Declaration
4634 First (Visible_Declarations
4635 (Specification (Unit (Library_Unit (Item)))));
4636 while Present (Decl) loop
4637 if Nkind (Decl) = N_Package_Renaming_Declaration
4638 and then Entity (Name (Decl)) = P
4640 -- Generate the error message only if the current unit
4641 -- is a package declaration; in case of subprogram
4642 -- bodies and package bodies we just return True to
4643 -- indicate that the limited view must not be
4646 if Kind = N_Package_Declaration then
4648 ("simultaneous visibility of the limited and " &
4649 "unlimited views not allowed", N);
4650 Error_Msg_Sloc := Sloc (Item);
4652 ("\\ unlimited view of & visible through the " &
4653 "context clause #", N, P);
4654 Error_Msg_Sloc := Sloc (Decl);
4655 Error_Msg_NE ("\\ and the renaming #", N, P);
4668 -- If it is a body not acting as spec, follow pointer to the
4669 -- corresponding spec, otherwise follow pointer to parent spec.
4671 if Present (Library_Unit (Aux_Unit))
4672 and then Nkind_In (Unit (Aux_Unit),
4673 N_Package_Body, N_Subprogram_Body)
4675 if Aux_Unit = Library_Unit (Aux_Unit) then
4677 -- Aux_Unit is a body that acts as a spec. Clause has
4678 -- already been flagged as illegal.
4683 Aux_Unit := Library_Unit (Aux_Unit);
4687 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4690 exit when No (Aux_Unit);
4694 end Is_Visible_Through_Renamings;
4696 -- Start of processing for Install_Limited_Withed_Unit
4699 pragma Assert (not Limited_View_Installed (N));
4701 -- In case of limited with_clause on subprograms, generics, instances,
4702 -- or renamings, the corresponding error was previously posted and we
4703 -- have nothing to do here. If the file is missing altogether, it has
4704 -- no source location.
4706 if Nkind (P_Unit) /= N_Package_Declaration
4707 or else Sloc (P_Unit) = No_Location
4712 P := Defining_Unit_Name (Specification (P_Unit));
4714 -- Handle child packages
4716 if Nkind (P) = N_Defining_Program_Unit_Name then
4717 Is_Child_Package := True;
4718 P := Defining_Identifier (P);
4721 -- Do not install the limited-view if the context of the unit is already
4722 -- available through a regular with clause.
4724 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4725 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4730 -- Do not install the limited-view if the full-view is already visible
4731 -- through renaming declarations.
4733 if Is_Visible_Through_Renamings (P) then
4737 -- Do not install the limited view if this is the unit being analyzed.
4738 -- This unusual case will happen when a unit has a limited_with clause
4739 -- on one of its children. The compilation of the child forces the load
4740 -- of the parent which tries to install the limited view of the child
4741 -- again. Installing the limited view must also be disabled when
4742 -- compiling the body of the child unit.
4744 if P = Cunit_Entity (Current_Sem_Unit)
4746 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4747 and then P = Main_Unit_Entity)
4752 -- This scenario is similar to the one above, the difference is that the
4753 -- compilation of sibling Par.Sib forces the load of parent Par which
4754 -- tries to install the limited view of Lim_Pack [1]. However Par.Sib
4755 -- has a with clause for Lim_Pack [2] in its body, and thus needs the
4756 -- non-limited views of all entities from Lim_Pack.
4758 -- limited with Lim_Pack; -- [1]
4759 -- package Par is ... package Lim_Pack is ...
4761 -- with Lim_Pack; -- [2]
4762 -- package Par.Sib is ... package body Par.Sib is ...
4764 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4765 -- Sem_Unit is the body of Par.Sib.
4767 if Ekind (P) = E_Package
4768 and then Ekind (Main_Unit_Entity) = E_Package
4769 and then Is_Child_Unit (Main_Unit_Entity)
4771 -- The body has a regular with clause
4773 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4774 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4776 -- One of the ancestors has a limited with clause
4778 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4779 N_Package_Specification
4780 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4785 -- A common use of the limited-with is to have a limited-with in the
4786 -- package spec, and a normal with in its package body. For example:
4788 -- limited with X; -- [1]
4792 -- package body A is ...
4794 -- The compilation of A's body installs the context clauses found at [2]
4795 -- and then the context clauses of its specification (found at [1]). As
4796 -- a consequence, at [1] the specification of X has been analyzed and it
4797 -- is immediately visible. According to the semantics of limited-with
4798 -- context clauses we don't install the limited view because the full
4799 -- view of X supersedes its limited view.
4801 if Analyzed (P_Unit)
4803 (Is_Immediately_Visible (P)
4804 or else (Is_Child_Package and then Is_Visible_Child_Unit (P)))
4807 -- The presence of both the limited and the analyzed nonlimited view
4808 -- may also be an error, such as an illegal context for a limited
4809 -- with_clause. In that case, do not process the context item at all.
4811 if Error_Posted (N) then
4815 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body then
4819 Item := First (Context_Items (Cunit (Current_Sem_Unit)));
4820 while Present (Item) loop
4821 if Nkind (Item) = N_With_Clause
4822 and then Comes_From_Source (Item)
4823 and then Entity (Name (Item)) = P
4832 -- If this is a child body, assume that the nonlimited with_clause
4833 -- appears in an ancestor. Could be refined ???
4837 (Unit (Library_Unit (Cunit (Current_Sem_Unit)))))
4844 -- If in package declaration, nonlimited view brought in from
4845 -- parent unit or some error condition.
4851 if Debug_Flag_I then
4852 Write_Str ("install limited view of ");
4853 Write_Name (Chars (P));
4857 -- If the unit has not been analyzed and the limited view has not been
4858 -- already installed then we install it.
4860 if not Analyzed (P_Unit) then
4861 if not In_Chain (P) then
4863 -- Minimum decoration
4865 Set_Ekind (P, E_Package);
4866 Set_Etype (P, Standard_Void_Type);
4867 Set_Scope (P, Standard_Standard);
4869 if Is_Child_Package then
4870 Set_Is_Child_Unit (P);
4871 Set_Is_Visible_Child_Unit (P);
4872 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4875 -- Place entity on visibility structure
4877 Set_Homonym (P, Current_Entity (P));
4878 Set_Current_Entity (P);
4880 if Debug_Flag_I then
4881 Write_Str (" (homonym) chain ");
4882 Write_Name (Chars (P));
4886 -- Install the incomplete view. The first element of the limited
4887 -- view is a header (an E_Package entity) used to reference the
4888 -- first shadow entity in the private part of the package.
4890 Lim_Header := Limited_View (P);
4891 Lim_Typ := First_Entity (Lim_Header);
4893 while Present (Lim_Typ)
4894 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4896 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4897 Set_Current_Entity (Lim_Typ);
4899 if Debug_Flag_I then
4900 Write_Str (" (homonym) chain ");
4901 Write_Name (Chars (Lim_Typ));
4905 Next_Entity (Lim_Typ);
4909 -- If the unit appears in a previous regular with_clause, the regular
4910 -- entities of the public part of the withed package must be replaced
4911 -- by the shadow ones.
4913 -- This code must be kept synchronized with the code that replaces the
4914 -- shadow entities by the real entities (see body of Remove_Limited
4915 -- With_Clause); otherwise the contents of the homonym chains are not
4919 -- Hide all the type entities of the public part of the package to
4920 -- avoid its usage. This is needed to cover all the subtype decla-
4921 -- rations because we do not remove them from the homonym chain.
4923 E := First_Entity (P);
4924 while Present (E) and then E /= First_Private_Entity (P) loop
4926 Set_Was_Hidden (E, Is_Hidden (E));
4933 -- Replace the real entities by the shadow entities of the limited
4934 -- view. The first element of the limited view is a header that is
4935 -- used to reference the first shadow entity in the private part
4936 -- of the package. Successive elements are the limited views of the
4937 -- type (including regular incomplete types) declared in the package.
4939 Lim_Header := Limited_View (P);
4941 Lim_Typ := First_Entity (Lim_Header);
4942 while Present (Lim_Typ)
4943 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4945 pragma Assert (not In_Chain (Lim_Typ));
4947 -- Do not unchain nested packages and child units
4949 if Ekind (Lim_Typ) /= E_Package
4950 and then not Is_Child_Unit (Lim_Typ)
4956 Prev := Current_Entity (Lim_Typ);
4959 -- Replace E in the homonyms list, so that the limited view
4960 -- becomes available.
4962 if E = Non_Limited_View (Lim_Typ) then
4963 Set_Homonym (Lim_Typ, Homonym (Prev));
4964 Set_Current_Entity (Lim_Typ);
4968 E := Homonym (Prev);
4970 -- E may have been removed when installing a previous
4971 -- limited_with_clause.
4975 exit when E = Non_Limited_View (Lim_Typ);
4977 Prev := Homonym (Prev);
4981 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4982 Set_Homonym (Prev, Lim_Typ);
4987 if Debug_Flag_I then
4988 Write_Str (" (homonym) chain ");
4989 Write_Name (Chars (Lim_Typ));
4994 Next_Entity (Lim_Typ);
4998 -- The package must be visible while the limited-with clause is active
4999 -- because references to the type P.T must resolve in the usual way.
5000 -- In addition, we remember that the limited-view has been installed to
5001 -- uninstall it at the point of context removal.
5003 Set_Is_Immediately_Visible (P);
5004 Set_Limited_View_Installed (N);
5006 -- If unit has not been analyzed in some previous context, check
5007 -- (imperfectly ???) whether it might need a body.
5009 if not Analyzed (P_Unit) then
5010 Check_Body_Required;
5013 -- If the package in the limited_with clause is a child unit, the clause
5014 -- is unanalyzed and appears as a selected component. Recast it as an
5015 -- expanded name so that the entity can be properly set. Use entity of
5016 -- parent, if available, for higher ancestors in the name.
5018 if Nkind (Name (N)) = N_Selected_Component then
5026 while Nkind (Nam) = N_Selected_Component
5027 and then Present (Ent)
5029 Change_Selected_Component_To_Expanded_Name (Nam);
5031 -- Set entity of parent identifiers if the unit is a child
5032 -- unit. This ensures that the tree is properly formed from
5033 -- semantic point of view (e.g. for ASIS queries). The unit
5034 -- entities are not fully analyzed, so we need to follow unit
5035 -- links in the tree.
5037 Set_Entity (Nam, Ent);
5039 Nam := Prefix (Nam);
5042 (Unit (Parent_Spec (Unit_Declaration_Node (Ent))));
5044 -- Set entity of last ancestor
5046 if Nkind (Nam) = N_Identifier then
5047 Set_Entity (Nam, Ent);
5053 Set_Entity (Name (N), P);
5054 Set_From_With_Type (P);
5055 end Install_Limited_Withed_Unit;
5057 -------------------------
5058 -- Install_Withed_Unit --
5059 -------------------------
5061 procedure Install_Withed_Unit
5062 (With_Clause : Node_Id;
5063 Private_With_OK : Boolean := False)
5065 Uname : constant Entity_Id := Entity (Name (With_Clause));
5066 P : constant Entity_Id := Scope (Uname);
5069 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
5070 -- compiling a package declaration and the Private_With_OK flag was not
5071 -- set by the caller. These declarations will be installed later (before
5072 -- analyzing the private part of the package).
5074 if Private_Present (With_Clause)
5075 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
5076 and then not (Private_With_OK)
5081 if Debug_Flag_I then
5082 if Private_Present (With_Clause) then
5083 Write_Str ("install private withed unit ");
5085 Write_Str ("install withed unit ");
5088 Write_Name (Chars (Uname));
5092 -- We do not apply the restrictions to an internal unit unless we are
5093 -- compiling the internal unit as a main unit. This check is also
5094 -- skipped for dummy units (for missing packages).
5096 if Sloc (Uname) /= No_Location
5097 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
5098 or else Current_Sem_Unit = Main_Unit)
5100 Check_Restricted_Unit
5101 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
5104 if P /= Standard_Standard then
5106 -- If the unit is not analyzed after analysis of the with clause and
5107 -- it is an instantiation then it awaits a body and is the main unit.
5108 -- Its appearance in the context of some other unit indicates a
5109 -- circular dependency (DEC suite perversity).
5111 if not Analyzed (Uname)
5112 and then Nkind (Parent (Uname)) = N_Package_Instantiation
5115 ("instantiation depends on itself", Name (With_Clause));
5117 elsif not Is_Visible_Child_Unit (Uname) then
5119 -- Abandon processing in case of previous errors
5121 if No (Scope (Uname)) then
5122 pragma Assert (Serious_Errors_Detected /= 0);
5126 Set_Is_Visible_Child_Unit (Uname);
5128 -- If the child unit appears in the context of its parent, it is
5129 -- immediately visible.
5131 if In_Open_Scopes (Scope (Uname)) then
5132 Set_Is_Immediately_Visible (Uname);
5135 if Is_Generic_Instance (Uname)
5136 and then Ekind (Uname) in Subprogram_Kind
5138 -- Set flag as well on the visible entity that denotes the
5139 -- instance, which renames the current one.
5141 Set_Is_Visible_Child_Unit
5143 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
5146 -- The parent unit may have been installed already, and may have
5147 -- appeared in a use clause.
5149 if In_Use (Scope (Uname)) then
5150 Set_Is_Potentially_Use_Visible (Uname);
5153 Set_Context_Installed (With_Clause);
5156 elsif not Is_Immediately_Visible (Uname) then
5157 if not Private_Present (With_Clause)
5158 or else Private_With_OK
5160 Set_Is_Immediately_Visible (Uname);
5163 Set_Context_Installed (With_Clause);
5166 -- A with-clause overrides a with-type clause: there are no restric-
5167 -- tions on the use of package entities.
5169 if Ekind (Uname) = E_Package then
5170 Set_From_With_Type (Uname, False);
5173 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
5174 -- unit if there is a visible homograph for it declared in the same
5175 -- declarative region. This pathological case can only arise when an
5176 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
5177 -- G1 has a generic child also named G2, and the context includes with_
5178 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
5179 -- of I1.G2 visible as well. If the child unit is named Standard, do
5180 -- not apply the check to the Standard package itself.
5182 if Is_Child_Unit (Uname)
5183 and then Is_Visible_Child_Unit (Uname)
5184 and then Ada_Version >= Ada_2005
5187 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
5193 U2 := Homonym (Uname);
5195 and then U2 /= Standard_Standard
5198 Decl2 := Unit_Declaration_Node (P2);
5200 if Is_Child_Unit (U2)
5201 and then Is_Visible_Child_Unit (U2)
5203 if Is_Generic_Instance (P)
5204 and then Nkind (Decl1) = N_Package_Declaration
5205 and then Generic_Parent (Specification (Decl1)) = P2
5207 Error_Msg_N ("illegal with_clause", With_Clause);
5209 ("\child unit has visible homograph" &
5210 " (RM 8.3(26), 10.1.1(19))",
5214 elsif Is_Generic_Instance (P2)
5215 and then Nkind (Decl2) = N_Package_Declaration
5216 and then Generic_Parent (Specification (Decl2)) = P
5218 -- With_clause for child unit of instance appears before
5219 -- in the context. We want to place the error message on
5220 -- it, not on the generic child unit itself.
5223 Prev_Clause : Node_Id;
5226 Prev_Clause := First (List_Containing (With_Clause));
5227 while Entity (Name (Prev_Clause)) /= U2 loop
5231 pragma Assert (Present (Prev_Clause));
5232 Error_Msg_N ("illegal with_clause", Prev_Clause);
5234 ("\child unit has visible homograph" &
5235 " (RM 8.3(26), 10.1.1(19))",
5246 end Install_Withed_Unit;
5252 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
5253 K : constant Node_Kind := Nkind (Lib_Unit);
5256 return (K in N_Generic_Declaration or else
5257 K in N_Generic_Instantiation or else
5258 K in N_Generic_Renaming_Declaration or else
5259 K = N_Package_Declaration or else
5260 K = N_Package_Renaming_Declaration or else
5261 K = N_Subprogram_Declaration or else
5262 K = N_Subprogram_Renaming_Declaration)
5263 and then Present (Parent_Spec (Lib_Unit));
5266 ------------------------------------
5267 -- Is_Legal_Shadow_Entity_In_Body --
5268 ------------------------------------
5270 function Is_Legal_Shadow_Entity_In_Body (T : Entity_Id) return Boolean is
5271 C_Unit : constant Node_Id := Cunit (Current_Sem_Unit);
5273 return Nkind (Unit (C_Unit)) = N_Package_Body
5276 (C_Unit, Cunit_Entity (Get_Source_Unit (Non_Limited_View (T))));
5277 end Is_Legal_Shadow_Entity_In_Body;
5279 -----------------------
5280 -- Load_Needed_Body --
5281 -----------------------
5283 -- N is a generic unit named in a with clause, or else it is a unit that
5284 -- contains a generic unit or an inlined function. In order to perform an
5285 -- instantiation, the body of the unit must be present. If the unit itself
5286 -- is generic, we assume that an instantiation follows, and load & analyze
5287 -- the body unconditionally. This forces analysis of the spec as well.
5289 -- If the unit is not generic, but contains a generic unit, it is loaded on
5290 -- demand, at the point of instantiation (see ch12).
5292 procedure Load_Needed_Body
5295 Do_Analyze : Boolean := True)
5297 Body_Name : Unit_Name_Type;
5298 Unum : Unit_Number_Type;
5300 Save_Style_Check : constant Boolean := Opt.Style_Check;
5301 -- The loading and analysis is done with style checks off
5304 if not GNAT_Mode then
5305 Style_Check := False;
5308 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
5311 (Load_Name => Body_Name,
5317 if Unum = No_Unit then
5321 Compiler_State := Analyzing; -- reset after load
5323 if not Fatal_Error (Unum) or else Try_Semantics then
5324 if Debug_Flag_L then
5325 Write_Str ("*** Loaded generic body");
5330 Semantics (Cunit (Unum));
5337 Style_Check := Save_Style_Check;
5338 end Load_Needed_Body;
5340 -------------------------
5341 -- Build_Limited_Views --
5342 -------------------------
5344 procedure Build_Limited_Views (N : Node_Id) is
5345 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
5346 P : constant Entity_Id := Cunit_Entity (Unum);
5348 Spec : Node_Id; -- To denote a package specification
5349 Lim_Typ : Entity_Id; -- To denote shadow entities
5350 Comp_Typ : Entity_Id; -- To denote real entities
5352 Lim_Header : Entity_Id; -- Package entity
5353 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
5354 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
5356 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id);
5357 -- Add attributes of an incomplete type to a shadow entity. The same
5358 -- attributes are placed on the real entity, so that gigi receives
5359 -- a consistent view.
5361 procedure Decorate_Package_Specification (P : Entity_Id);
5362 -- Add attributes of a package entity to the entity in a package
5365 procedure Decorate_Tagged_Type
5369 Mark : Boolean := False);
5370 -- Set basic attributes of tagged type T, including its class-wide type.
5371 -- The parameters Loc, Scope are used to decorate the class-wide type.
5372 -- Use flag Mark to label the class-wide type as Materialize_Entity.
5374 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id);
5375 -- Construct list of shadow entities and attach it to entity of
5376 -- package that is mentioned in a limited_with clause.
5378 function New_Internal_Shadow_Entity
5379 (Kind : Entity_Kind;
5380 Sloc_Value : Source_Ptr;
5381 Id_Char : Character) return Entity_Id;
5382 -- Build a new internal entity and append it to the list of shadow
5383 -- entities available through the limited-header
5389 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id) is
5390 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
5391 Is_Tagged : Boolean;
5396 while Present (Decl) loop
5398 -- For each library_package_declaration in the environment, there
5399 -- is an implicit declaration of a *limited view* of that library
5400 -- package. The limited view of a package contains:
5402 -- * For each nested package_declaration, a declaration of the
5403 -- limited view of that package, with the same defining-
5404 -- program-unit name.
5406 -- * For each type_declaration in the visible part, an incomplete
5407 -- type-declaration with the same defining_identifier, whose
5408 -- completion is the type_declaration. If the type_declaration
5409 -- is tagged, then the incomplete_type_declaration is tagged
5412 -- The partial view is tagged if the declaration has the
5413 -- explicit keyword, or else if it is a type extension, both
5414 -- of which can be ascertained syntactically.
5416 if Nkind (Decl) = N_Full_Type_Declaration then
5418 (Nkind (Type_Definition (Decl)) = N_Record_Definition
5419 and then Tagged_Present (Type_Definition (Decl)))
5421 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
5424 (Record_Extension_Part (Type_Definition (Decl))));
5426 Comp_Typ := Defining_Identifier (Decl);
5428 if not Analyzed_Unit then
5430 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5432 Decorate_Incomplete_Type (Comp_Typ, Scope);
5436 -- Create shadow entity for type
5439 New_Internal_Shadow_Entity
5440 (Kind => Ekind (Comp_Typ),
5441 Sloc_Value => Sloc (Comp_Typ),
5444 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5445 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5446 Set_From_With_Type (Lim_Typ);
5449 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5451 Decorate_Incomplete_Type (Lim_Typ, Scope);
5454 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5455 Set_Private_Dependents (Lim_Typ, New_Elmt_List);
5457 elsif Nkind_In (Decl, N_Private_Type_Declaration,
5458 N_Incomplete_Type_Declaration,
5459 N_Task_Type_Declaration,
5460 N_Protected_Type_Declaration)
5462 Comp_Typ := Defining_Identifier (Decl);
5465 Nkind_In (Decl, N_Private_Type_Declaration,
5466 N_Incomplete_Type_Declaration)
5467 and then Tagged_Present (Decl);
5469 if not Analyzed_Unit then
5471 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5473 Decorate_Incomplete_Type (Comp_Typ, Scope);
5478 New_Internal_Shadow_Entity
5479 (Kind => Ekind (Comp_Typ),
5480 Sloc_Value => Sloc (Comp_Typ),
5483 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5484 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5485 Set_From_With_Type (Lim_Typ);
5488 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5490 Decorate_Incomplete_Type (Lim_Typ, Scope);
5493 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5495 -- Initialize Private_Depedents, so the field has the proper
5496 -- type, even though the list will remain empty.
5498 Set_Private_Dependents (Lim_Typ, New_Elmt_List);
5500 elsif Nkind (Decl) = N_Private_Extension_Declaration then
5501 Comp_Typ := Defining_Identifier (Decl);
5503 if not Analyzed_Unit then
5504 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5507 -- Create shadow entity for type
5510 New_Internal_Shadow_Entity
5511 (Kind => Ekind (Comp_Typ),
5512 Sloc_Value => Sloc (Comp_Typ),
5515 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5516 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5517 Set_From_With_Type (Lim_Typ);
5519 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5520 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5522 elsif Nkind (Decl) = N_Package_Declaration then
5527 Spec : constant Node_Id := Specification (Decl);
5530 Comp_Typ := Defining_Unit_Name (Spec);
5532 if not Analyzed (Cunit (Unum)) then
5533 Decorate_Package_Specification (Comp_Typ);
5534 Set_Scope (Comp_Typ, Scope);
5538 New_Internal_Shadow_Entity
5539 (Kind => Ekind (Comp_Typ),
5540 Sloc_Value => Sloc (Comp_Typ),
5543 Decorate_Package_Specification (Lim_Typ);
5544 Set_Scope (Lim_Typ, Scope);
5546 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5547 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5548 Set_From_With_Type (Lim_Typ);
5550 -- Note: The non_limited_view attribute is not used
5551 -- for local packages.
5555 First_Decl => First (Visible_Declarations (Spec)));
5563 ------------------------------
5564 -- Decorate_Incomplete_Type --
5565 ------------------------------
5567 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id) is
5569 Set_Ekind (E, E_Incomplete_Type);
5570 Set_Scope (E, Scop);
5572 Set_Is_First_Subtype (E, True);
5573 Set_Stored_Constraint (E, No_Elist);
5574 Set_Full_View (E, Empty);
5575 Init_Size_Align (E);
5576 end Decorate_Incomplete_Type;
5578 --------------------------
5579 -- Decorate_Tagged_Type --
5580 --------------------------
5582 procedure Decorate_Tagged_Type
5586 Mark : Boolean := False)
5591 Decorate_Incomplete_Type (T, Scop);
5592 Set_Is_Tagged_Type (T);
5594 -- Build corresponding class_wide type, if not previously done
5596 -- Note: The class-wide entity is shared by the limited-view
5597 -- and the full-view.
5599 if No (Class_Wide_Type (T)) then
5600 CW := New_External_Entity (E_Void, Scope (T), Loc, T, 'C', 0, 'T');
5602 -- Set parent to be the same as the parent of the tagged type.
5603 -- We need a parent field set, and it is supposed to point to
5604 -- the declaration of the type. The tagged type declaration
5605 -- essentially declares two separate types, the tagged type
5606 -- itself and the corresponding class-wide type, so it is
5607 -- reasonable for the parent fields to point to the declaration
5610 Set_Parent (CW, Parent (T));
5612 -- Set remaining fields of classwide type
5614 Set_Ekind (CW, E_Class_Wide_Type);
5616 Set_Scope (CW, Scop);
5617 Set_Is_Tagged_Type (CW);
5618 Set_Is_First_Subtype (CW, True);
5619 Init_Size_Align (CW);
5620 Set_Has_Unknown_Discriminants (CW, True);
5621 Set_Class_Wide_Type (CW, CW);
5622 Set_Equivalent_Type (CW, Empty);
5623 Set_From_With_Type (CW, From_With_Type (T));
5624 Set_Materialize_Entity (CW, Mark);
5626 -- Link type to its class-wide type
5628 Set_Class_Wide_Type (T, CW);
5630 end Decorate_Tagged_Type;
5632 ------------------------------------
5633 -- Decorate_Package_Specification --
5634 ------------------------------------
5636 procedure Decorate_Package_Specification (P : Entity_Id) is
5638 -- Place only the most basic attributes
5640 Set_Ekind (P, E_Package);
5641 Set_Etype (P, Standard_Void_Type);
5642 end Decorate_Package_Specification;
5644 --------------------------------
5645 -- New_Internal_Shadow_Entity --
5646 --------------------------------
5648 function New_Internal_Shadow_Entity
5649 (Kind : Entity_Kind;
5650 Sloc_Value : Source_Ptr;
5651 Id_Char : Character) return Entity_Id
5653 E : constant Entity_Id := Make_Temporary (Sloc_Value, Id_Char);
5656 Set_Ekind (E, Kind);
5657 Set_Is_Internal (E, True);
5659 if Kind in Type_Kind then
5660 Init_Size_Align (E);
5663 Append_Entity (E, Lim_Header);
5666 end New_Internal_Shadow_Entity;
5668 -- Start of processing for Build_Limited_Views
5671 pragma Assert (Limited_Present (N));
5673 -- A library_item mentioned in a limited_with_clause is a package
5674 -- declaration, not a subprogram declaration, generic declaration,
5675 -- generic instantiation, or package renaming declaration.
5677 case Nkind (Unit (Library_Unit (N))) is
5678 when N_Package_Declaration =>
5681 when N_Subprogram_Declaration =>
5682 Error_Msg_N ("subprograms not allowed in "
5683 & "limited with_clauses", N);
5686 when N_Generic_Package_Declaration |
5687 N_Generic_Subprogram_Declaration =>
5688 Error_Msg_N ("generics not allowed in "
5689 & "limited with_clauses", N);
5692 when N_Generic_Instantiation =>
5693 Error_Msg_N ("generic instantiations not allowed in "
5694 & "limited with_clauses", N);
5697 when N_Generic_Renaming_Declaration =>
5698 Error_Msg_N ("generic renamings not allowed in "
5699 & "limited with_clauses", N);
5702 when N_Subprogram_Renaming_Declaration =>
5703 Error_Msg_N ("renamed subprograms not allowed in "
5704 & "limited with_clauses", N);
5707 when N_Package_Renaming_Declaration =>
5708 Error_Msg_N ("renamed packages not allowed in "
5709 & "limited with_clauses", N);
5713 raise Program_Error;
5716 -- Check if the chain is already built
5718 Spec := Specification (Unit (Library_Unit (N)));
5720 if Limited_View_Installed (Spec) then
5724 Set_Ekind (P, E_Package);
5726 -- Build the header of the limited_view
5728 Lim_Header := Make_Temporary (Sloc (N), 'Z');
5729 Set_Ekind (Lim_Header, E_Package);
5730 Set_Is_Internal (Lim_Header);
5731 Set_Limited_View (P, Lim_Header);
5733 -- Create the auxiliary chain. All the shadow entities are appended to
5734 -- the list of entities of the limited-view header
5738 First_Decl => First (Visible_Declarations (Spec)));
5740 -- Save the last built shadow entity. It is needed later to set the
5741 -- reference to the first shadow entity in the private part
5743 Last_Pub_Lim_E := Last_Lim_E;
5745 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5746 -- Required to give support to limited-private-with clauses
5748 Build_Chain (Scope => P,
5749 First_Decl => First (Private_Declarations (Spec)));
5751 if Last_Pub_Lim_E /= Empty then
5752 Set_First_Private_Entity
5753 (Lim_Header, Next_Entity (Last_Pub_Lim_E));
5755 Set_First_Private_Entity
5756 (Lim_Header, First_Entity (P));
5759 Set_Limited_View_Installed (Spec);
5760 end Build_Limited_Views;
5762 -------------------------------
5763 -- Check_Body_Needed_For_SAL --
5764 -------------------------------
5766 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5768 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5769 -- Determine whether use of entity E might require the presence of its
5770 -- body. For a package this requires a recursive traversal of all nested
5773 ---------------------------
5774 -- Entity_Needed_For_SAL --
5775 ---------------------------
5777 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5781 if Is_Subprogram (E)
5782 and then Has_Pragma_Inline (E)
5786 elsif Ekind_In (E, E_Generic_Function, E_Generic_Procedure) then
5789 elsif Ekind (E) = E_Generic_Package
5791 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5792 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5796 elsif Ekind (E) = E_Package
5797 and then Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5798 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5800 Ent := First_Entity (E);
5801 while Present (Ent) loop
5802 if Entity_Needs_Body (Ent) then
5814 end Entity_Needs_Body;
5816 -- Start of processing for Check_Body_Needed_For_SAL
5819 if Ekind (Unit_Name) = E_Generic_Package
5820 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5821 N_Generic_Package_Declaration
5823 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5825 Set_Body_Needed_For_SAL (Unit_Name);
5827 elsif Ekind_In (Unit_Name, E_Generic_Procedure, E_Generic_Function) then
5828 Set_Body_Needed_For_SAL (Unit_Name);
5830 elsif Is_Subprogram (Unit_Name)
5831 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5832 N_Subprogram_Declaration
5833 and then Has_Pragma_Inline (Unit_Name)
5835 Set_Body_Needed_For_SAL (Unit_Name);
5837 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5838 Check_Body_Needed_For_SAL
5839 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5841 elsif Ekind (Unit_Name) = E_Package
5842 and then Entity_Needs_Body (Unit_Name)
5844 Set_Body_Needed_For_SAL (Unit_Name);
5846 elsif Ekind (Unit_Name) = E_Package_Body
5847 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5849 Check_Body_Needed_For_SAL
5850 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5852 end Check_Body_Needed_For_SAL;
5854 --------------------
5855 -- Remove_Context --
5856 --------------------
5858 procedure Remove_Context (N : Node_Id) is
5859 Lib_Unit : constant Node_Id := Unit (N);
5862 -- If this is a child unit, first remove the parent units
5864 if Is_Child_Spec (Lib_Unit) then
5865 Remove_Parents (Lib_Unit);
5868 Remove_Context_Clauses (N);
5871 ----------------------------
5872 -- Remove_Context_Clauses --
5873 ----------------------------
5875 procedure Remove_Context_Clauses (N : Node_Id) is
5877 Unit_Name : Entity_Id;
5880 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5881 -- limited-views first and regular-views later (to maintain the
5884 -- First Phase: Remove limited_with context clauses
5886 Item := First (Context_Items (N));
5887 while Present (Item) loop
5889 -- We are interested only in with clauses which got installed
5892 if Nkind (Item) = N_With_Clause
5893 and then Limited_Present (Item)
5894 and then Limited_View_Installed (Item)
5896 Remove_Limited_With_Clause (Item);
5902 -- Second Phase: Loop through context items and undo regular
5903 -- with_clauses and use_clauses.
5905 Item := First (Context_Items (N));
5906 while Present (Item) loop
5908 -- We are interested only in with clauses which got installed on
5909 -- entry, as indicated by their Context_Installed flag set
5911 if Nkind (Item) = N_With_Clause
5912 and then Limited_Present (Item)
5913 and then Limited_View_Installed (Item)
5917 elsif Nkind (Item) = N_With_Clause
5918 and then Context_Installed (Item)
5920 -- Remove items from one with'ed unit
5922 Unit_Name := Entity (Name (Item));
5923 Remove_Unit_From_Visibility (Unit_Name);
5924 Set_Context_Installed (Item, False);
5926 elsif Nkind (Item) = N_Use_Package_Clause then
5927 End_Use_Package (Item);
5929 elsif Nkind (Item) = N_Use_Type_Clause then
5930 End_Use_Type (Item);
5935 end Remove_Context_Clauses;
5937 --------------------------------
5938 -- Remove_Limited_With_Clause --
5939 --------------------------------
5941 procedure Remove_Limited_With_Clause (N : Node_Id) is
5942 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5945 Lim_Header : Entity_Id;
5946 Lim_Typ : Entity_Id;
5950 pragma Assert (Limited_View_Installed (N));
5952 -- In case of limited with_clause on subprograms, generics, instances,
5953 -- or renamings, the corresponding error was previously posted and we
5954 -- have nothing to do here.
5956 if Nkind (P_Unit) /= N_Package_Declaration then
5960 P := Defining_Unit_Name (Specification (P_Unit));
5962 -- Handle child packages
5964 if Nkind (P) = N_Defining_Program_Unit_Name then
5965 P := Defining_Identifier (P);
5968 if Debug_Flag_I then
5969 Write_Str ("remove limited view of ");
5970 Write_Name (Chars (P));
5971 Write_Str (" from visibility");
5975 -- Prepare the removal of the shadow entities from visibility. The first
5976 -- element of the limited view is a header (an E_Package entity) that is
5977 -- used to reference the first shadow entity in the private part of the
5980 Lim_Header := Limited_View (P);
5981 Lim_Typ := First_Entity (Lim_Header);
5983 -- Remove package and shadow entities from visibility if it has not
5986 if not Analyzed (P_Unit) then
5988 Set_Is_Immediately_Visible (P, False);
5990 while Present (Lim_Typ) loop
5992 Next_Entity (Lim_Typ);
5995 -- Otherwise this package has already appeared in the closure and its
5996 -- shadow entities must be replaced by its real entities. This code
5997 -- must be kept synchronized with the complementary code in Install
5998 -- Limited_Withed_Unit.
6001 -- Real entities that are type or subtype declarations were hidden
6002 -- from visibility at the point of installation of the limited-view.
6003 -- Now we recover the previous value of the hidden attribute.
6005 E := First_Entity (P);
6006 while Present (E) and then E /= First_Private_Entity (P) loop
6008 Set_Is_Hidden (E, Was_Hidden (E));
6014 while Present (Lim_Typ)
6015 and then Lim_Typ /= First_Private_Entity (Lim_Header)
6017 -- Nested packages and child units were not unchained
6019 if Ekind (Lim_Typ) /= E_Package
6020 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
6022 -- If the package has incomplete types, the limited view of the
6023 -- incomplete type is in fact never visible (AI05-129) but we
6024 -- have created a shadow entity E1 for it, that points to E2,
6025 -- a non-limited incomplete type. This in turn has a full view
6026 -- E3 that is the full declaration. There is a corresponding
6027 -- shadow entity E4. When reinstalling the non-limited view,
6028 -- E2 must become the current entity and E3 must be ignored.
6030 E := Non_Limited_View (Lim_Typ);
6032 if Present (Current_Entity (E))
6033 and then Ekind (Current_Entity (E)) = E_Incomplete_Type
6034 and then Full_View (Current_Entity (E)) = E
6037 -- Lim_Typ is the limited view of a full type declaration
6038 -- that has a previous incomplete declaration, i.e. E3 from
6039 -- the previous description. Nothing to insert.
6044 pragma Assert (not In_Chain (E));
6046 Prev := Current_Entity (Lim_Typ);
6048 if Prev = Lim_Typ then
6049 Set_Current_Entity (E);
6052 while Present (Prev)
6053 and then Homonym (Prev) /= Lim_Typ
6055 Prev := Homonym (Prev);
6058 if Present (Prev) then
6059 Set_Homonym (Prev, E);
6063 -- Preserve structure of homonym chain
6065 Set_Homonym (E, Homonym (Lim_Typ));
6069 Next_Entity (Lim_Typ);
6073 -- Indicate that the limited view of the package is not installed
6075 Set_From_With_Type (P, False);
6076 Set_Limited_View_Installed (N, False);
6077 end Remove_Limited_With_Clause;
6079 --------------------
6080 -- Remove_Parents --
6081 --------------------
6083 procedure Remove_Parents (Lib_Unit : Node_Id) is
6086 P_Spec : Node_Id := Empty;
6088 Vis : constant Boolean :=
6089 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
6092 if Is_Child_Spec (Lib_Unit) then
6093 P_Spec := Parent_Spec (Lib_Unit);
6095 elsif Nkind (Lib_Unit) = N_Package_Body
6096 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
6098 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
6101 if Present (P_Spec) then
6103 P_Name := Get_Parent_Entity (P);
6104 Remove_Context_Clauses (P_Spec);
6105 End_Package_Scope (P_Name);
6106 Set_Is_Immediately_Visible (P_Name, Vis);
6108 -- Remove from visibility the siblings as well, which are directly
6109 -- visible while the parent is in scope.
6111 E := First_Entity (P_Name);
6112 while Present (E) loop
6113 if Is_Child_Unit (E) then
6114 Set_Is_Immediately_Visible (E, False);
6120 Set_In_Package_Body (P_Name, False);
6122 -- This is the recursive call to remove the context of any higher
6123 -- level parent. This recursion ensures that all parents are removed
6124 -- in the reverse order of their installation.
6130 ---------------------------------
6131 -- Remove_Private_With_Clauses --
6132 ---------------------------------
6134 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
6137 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
6138 -- Check whether a given unit appears in a regular with_clause. Used to
6139 -- determine whether a private_with_clause, implicit or explicit, should
6142 ----------------------------
6143 -- In_Regular_With_Clause --
6144 ----------------------------
6146 function In_Regular_With_Clause (E : Entity_Id) return Boolean
6151 Item := First (Context_Items (Comp_Unit));
6152 while Present (Item) loop
6153 if Nkind (Item) = N_With_Clause
6154 and then Entity (Name (Item)) = E
6155 and then not Private_Present (Item)
6163 end In_Regular_With_Clause;
6165 -- Start of processing for Remove_Private_With_Clauses
6168 Item := First (Context_Items (Comp_Unit));
6169 while Present (Item) loop
6170 if Nkind (Item) = N_With_Clause
6171 and then Private_Present (Item)
6173 -- If private_with_clause is redundant, remove it from context,
6174 -- as a small optimization to subsequent handling of private_with
6175 -- clauses in other nested packages.
6177 if In_Regular_With_Clause (Entity (Name (Item))) then
6179 Nxt : constant Node_Id := Next (Item);
6185 elsif Limited_Present (Item) then
6186 if not Limited_View_Installed (Item) then
6187 Remove_Limited_With_Clause (Item);
6193 Remove_Unit_From_Visibility (Entity (Name (Item)));
6194 Set_Context_Installed (Item, False);
6202 end Remove_Private_With_Clauses;
6204 ---------------------------------
6205 -- Remove_Unit_From_Visibility --
6206 ---------------------------------
6208 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
6209 P : constant Entity_Id := Scope (Unit_Name);
6212 if Debug_Flag_I then
6213 Write_Str ("remove unit ");
6214 Write_Name (Chars (Unit_Name));
6215 Write_Str (" from visibility");
6219 if P /= Standard_Standard then
6220 Set_Is_Visible_Child_Unit (Unit_Name, False);
6223 Set_Is_Potentially_Use_Visible (Unit_Name, False);
6224 Set_Is_Immediately_Visible (Unit_Name, False);
6225 end Remove_Unit_From_Visibility;
6240 procedure Unchain (E : Entity_Id) is
6244 Prev := Current_Entity (E);
6250 Set_Name_Entity_Id (Chars (E), Homonym (E));
6253 while Present (Prev)
6254 and then Homonym (Prev) /= E
6256 Prev := Homonym (Prev);
6259 if Present (Prev) then
6260 Set_Homonym (Prev, Homonym (E));
6264 if Debug_Flag_I then
6265 Write_Str (" (homonym) unchain ");
6266 Write_Name (Chars (E));
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