1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Debug; use Debug;
28 with Einfo; use Einfo;
29 with Errout; use Errout;
30 with Exp_Util; use Exp_Util;
31 with Elists; use Elists;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
35 with Impunit; use Impunit;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Namet; use Namet;
41 with Nlists; use Nlists;
42 with Nmake; use Nmake;
44 with Output; use Output;
45 with Par_SCO; use Par_SCO;
46 with Restrict; use Restrict;
47 with Rident; use Rident;
48 with Rtsfind; use Rtsfind;
50 with Sem_Ch3; use Sem_Ch3;
51 with Sem_Ch6; use Sem_Ch6;
52 with Sem_Ch7; use Sem_Ch7;
53 with Sem_Ch8; use Sem_Ch8;
54 with Sem_Dist; use Sem_Dist;
55 with Sem_Prag; use Sem_Prag;
56 with Sem_Util; use Sem_Util;
57 with Sem_Warn; use Sem_Warn;
58 with Stand; use Stand;
59 with Sinfo; use Sinfo;
60 with Sinfo.CN; use Sinfo.CN;
61 with Sinput; use Sinput;
62 with Snames; use Snames;
63 with Style; use Style;
64 with Stylesw; use Stylesw;
65 with Tbuild; use Tbuild;
66 with Uname; use Uname;
68 package body Sem_Ch10 is
70 -----------------------
71 -- Local Subprograms --
72 -----------------------
74 procedure Analyze_Context (N : Node_Id);
75 -- Analyzes items in the context clause of compilation unit
77 procedure Build_Limited_Views (N : Node_Id);
78 -- Build and decorate the list of shadow entities for a package mentioned
79 -- in a limited_with clause. If the package was not previously analyzed
80 -- then it also performs a basic decoration of the real entities. This is
81 -- required to do not pass non-decorated entities to the back-end.
82 -- Implements Ada 2005 (AI-50217).
84 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id);
85 -- Check whether the source for the body of a compilation unit must be
86 -- included in a standalone library.
88 procedure Check_Private_Child_Unit (N : Node_Id);
89 -- If a with_clause mentions a private child unit, the compilation
90 -- unit must be a member of the same family, as described in 10.1.2.
92 procedure Check_Stub_Level (N : Node_Id);
93 -- Verify that a stub is declared immediately within a compilation unit,
94 -- and not in an inner frame.
96 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id);
97 -- When a child unit appears in a context clause, the implicit withs on
98 -- parents are made explicit, and with clauses are inserted in the context
99 -- clause before the one for the child. If a parent in the with_clause
100 -- is a renaming, the implicit with_clause is on the renaming whose name
101 -- is mentioned in the with_clause, and not on the package it renames.
102 -- N is the compilation unit whose list of context items receives the
103 -- implicit with_clauses.
105 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
106 -- Get defining entity of parent unit of a child unit. In most cases this
107 -- is the defining entity of the unit, but for a child instance whose
108 -- parent needs a body for inlining, the instantiation node of the parent
109 -- has not yet been rewritten as a package declaration, and the entity has
110 -- to be retrieved from the Instance_Spec of the unit.
112 function Has_With_Clause
115 Is_Limited : Boolean := False) return Boolean;
116 -- Determine whether compilation unit C_Unit contains a [limited] with
117 -- clause for package Pack. Use the flag Is_Limited to designate desired
120 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id);
121 -- If the main unit is a child unit, implicit withs are also added for
122 -- all its ancestors.
124 function In_Chain (E : Entity_Id) return Boolean;
125 -- Check that the shadow entity is not already in the homonym chain, for
126 -- example through a limited_with clause in a parent unit.
128 procedure Install_Context_Clauses (N : Node_Id);
129 -- Subsidiary to Install_Context and Install_Parents. Process only with_
130 -- and use_clauses for current unit and its library unit if any.
132 procedure Install_Limited_Context_Clauses (N : Node_Id);
133 -- Subsidiary to Install_Context. Process only limited with_clauses for
134 -- current unit. Implements Ada 2005 (AI-50217).
136 procedure Install_Limited_Withed_Unit (N : Node_Id);
137 -- Place shadow entities for a limited_with package in the visibility
138 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
140 procedure Install_Withed_Unit
141 (With_Clause : Node_Id;
142 Private_With_OK : Boolean := False);
143 -- If the unit is not a child unit, make unit immediately visible. The
144 -- caller ensures that the unit is not already currently installed. The
145 -- flag Private_With_OK is set true in Install_Private_With_Clauses, which
146 -- is called when compiling the private part of a package, or installing
147 -- the private declarations of a parent unit.
149 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean);
150 -- This procedure establishes the context for the compilation of a child
151 -- unit. If Lib_Unit is a child library spec then the context of the parent
152 -- is installed, and the parent itself made immediately visible, so that
153 -- the child unit is processed in the declarative region of the parent.
154 -- Install_Parents makes a recursive call to itself to ensure that all
155 -- parents are loaded in the nested case. If Lib_Unit is a library body,
156 -- the only effect of Install_Parents is to install the private decls of
157 -- the parents, because the visible parent declarations will have been
158 -- installed as part of the context of the corresponding spec.
160 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id);
161 -- In the compilation of a child unit, a child of any of the ancestor
162 -- units is directly visible if it is visible, because the parent is in
163 -- an enclosing scope. Iterate over context to find child units of U_Name
164 -- or of some ancestor of it.
166 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean;
167 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
168 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
169 -- a library spec that has a parent. If the call to Is_Child_Spec returns
170 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
171 -- compilation unit for the parent spec.
173 -- Lib_Unit can also be a subprogram body that acts as its own spec. If the
174 -- Parent_Spec is non-empty, this is also a child unit.
176 procedure Remove_Context_Clauses (N : Node_Id);
177 -- Subsidiary of previous one. Remove use_ and with_clauses
179 procedure Remove_Limited_With_Clause (N : Node_Id);
180 -- Remove from visibility the shadow entities introduced for a package
181 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
183 procedure Remove_Parents (Lib_Unit : Node_Id);
184 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
185 -- contexts established by the corresponding call to Install_Parents are
186 -- removed. Remove_Parents contains a recursive call to itself to ensure
187 -- that all parents are removed in the nested case.
189 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
190 -- Reset all visibility flags on unit after compiling it, either as a
191 -- main unit or as a unit in the context.
193 procedure Unchain (E : Entity_Id);
194 -- Remove single entity from visibility list
196 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
197 -- Common processing for all stubs (subprograms, tasks, packages, and
198 -- protected cases). N is the stub to be analyzed. Once the subunit
199 -- name is established, load and analyze. Nam is the non-overloadable
200 -- entity for which the proper body provides a completion. Subprogram
201 -- stubs are handled differently because they can be declarations.
204 -- A dummy procedure, for debugging use, called just before analyzing the
205 -- main unit (after dealing with any context clauses).
207 --------------------------
208 -- Limited_With_Clauses --
209 --------------------------
211 -- Limited_With clauses are the mechanism chosen for Ada05 to support
212 -- mutually recursive types declared in different units. A limited_with
213 -- clause that names package P in the context of unit U makes the types
214 -- declared in the visible part of P available within U, but with the
215 -- restriction that these types can only be used as incomplete types.
216 -- The limited_with clause does not impose a semantic dependence on P,
217 -- and it is possible for two packages to have limited_with_clauses on
218 -- each other without creating an elaboration circularity.
220 -- To support this feature, the analysis of a limited_with clause must
221 -- create an abbreviated view of the package, without performing any
222 -- semantic analysis on it. This "package abstract" contains shadow types
223 -- that are in one-one correspondence with the real types in the package,
224 -- and that have the properties of incomplete types.
226 -- The implementation creates two element lists: one to chain the shadow
227 -- entities, and one to chain the corresponding type entities in the tree
228 -- of the package. Links between corresponding entities in both chains
229 -- allow the compiler to select the proper view of a given type, depending
230 -- on the context. Note that in contrast with the handling of private
231 -- types, the limited view and the non-limited view of a type are treated
232 -- as separate entities, and no entity exchange needs to take place, which
233 -- makes the implementation must simpler than could be feared.
235 ------------------------------
236 -- Analyze_Compilation_Unit --
237 ------------------------------
239 procedure Analyze_Compilation_Unit (N : Node_Id) is
240 Unit_Node : constant Node_Id := Unit (N);
241 Lib_Unit : Node_Id := Library_Unit (N);
243 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
244 Par_Spec_Name : Unit_Name_Type;
245 Unum : Unit_Number_Type;
247 procedure Check_Redundant_Withs
248 (Context_Items : List_Id;
249 Spec_Context_Items : List_Id := No_List);
250 -- Determine whether the context list of a compilation unit contains
251 -- redundant with clauses. When checking body clauses against spec
252 -- clauses, set Context_Items to the context list of the body and
253 -- Spec_Context_Items to that of the spec. Parent packages are not
254 -- examined for documentation purposes.
256 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
257 -- Generate cross-reference information for the parents of child units.
258 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
260 ---------------------------
261 -- Check_Redundant_Withs --
262 ---------------------------
264 procedure Check_Redundant_Withs
265 (Context_Items : List_Id;
266 Spec_Context_Items : List_Id := No_List)
270 procedure Process_Body_Clauses
271 (Context_List : List_Id;
273 Used : in out Boolean;
274 Used_Type_Or_Elab : in out Boolean);
275 -- Examine the context clauses of a package body, trying to match
276 -- the name entity of Clause with any list element. If the match
277 -- occurs on a use package clause, set Used to True, for a use
278 -- type clause, pragma Elaborate or pragma Elaborate_All, set
279 -- 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:
475 -- pragma Elaborate (Pack);
477 -- In this case, the second with clause is redundant since
478 -- the pragma applies only to the first "with Pack;".
480 elsif Nkind (Cont_Item) = N_With_Clause
481 and then not Implicit_With (Cont_Item)
482 and then not Limited_Present (Cont_Item)
483 and then Cont_Item /= Clause
484 and then Entity (Name (Cont_Item)) = Nam_Ent
491 end Process_Spec_Clauses;
493 -- Start of processing for Check_Redundant_Withs
496 Clause := Last (Context_Items);
497 while Present (Clause) loop
499 -- Avoid checking implicitly generated with clauses, limited with
500 -- clauses or withs that have pragma Elaborate or Elaborate_All.
502 if Nkind (Clause) = N_With_Clause
503 and then not Implicit_With (Clause)
504 and then not Limited_Present (Clause)
505 and then not Elaborate_Present (Clause)
507 -- Package body-to-spec check
509 if Present (Spec_Context_Items) then
511 Used_In_Body : Boolean := False;
512 Used_In_Spec : Boolean := False;
513 Used_Type_Or_Elab : Boolean := False;
514 Withed_In_Spec : Boolean := False;
518 (Context_List => Spec_Context_Items,
520 Used => Used_In_Spec,
521 Withed => Withed_In_Spec);
524 (Context_List => Context_Items,
526 Used => Used_In_Body,
527 Used_Type_Or_Elab => Used_Type_Or_Elab);
529 -- "Type Elab" refers to the presence of either a use
530 -- type clause, pragmas Elaborate or Elaborate_All.
532 -- +---------------+---------------------------+------+
533 -- | Spec | Body | Warn |
534 -- +--------+------+--------+------+-----------+------+
535 -- | Withed | Used | Withed | Used | Type Elab | |
536 -- | X | | X | | | X |
537 -- | X | | X | X | | |
538 -- | X | | X | | X | |
539 -- | X | | X | X | X | |
540 -- | X | X | X | | | X |
541 -- | X | X | X | | X | |
542 -- | X | X | X | X | | X |
543 -- | X | X | X | X | X | |
544 -- +--------+------+--------+------+-----------+------+
547 and then not Used_Type_Or_Elab)
550 and then not Used_In_Body)
554 Error_Msg_N -- CODEFIX
555 ("?redundant with clause in body", Clause);
558 Used_In_Body := False;
559 Used_In_Spec := False;
560 Used_Type_Or_Elab := False;
561 Withed_In_Spec := False;
564 -- Standalone package spec or body check
568 Dont_Care : Boolean := False;
569 Withed : Boolean := False;
572 -- The mechanism for examining the context clauses of a
573 -- package spec can be applied to package body clauses.
576 (Context_List => Context_Items,
580 Exit_On_Self => True);
583 Error_Msg_N -- CODEFIX
584 ("?redundant with clause", Clause);
592 end Check_Redundant_Withs;
594 --------------------------------
595 -- Generate_Parent_References --
596 --------------------------------
598 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is
600 P_Name : Entity_Id := P_Id;
603 Pref := Name (Parent (Defining_Entity (N)));
605 if Nkind (Pref) = N_Expanded_Name then
607 -- Done already, if the unit has been compiled indirectly as
608 -- part of the closure of its context because of inlining.
613 while Nkind (Pref) = N_Selected_Component loop
614 Change_Selected_Component_To_Expanded_Name (Pref);
615 Set_Entity (Pref, P_Name);
616 Set_Etype (Pref, Etype (P_Name));
617 Generate_Reference (P_Name, Pref, 'r');
618 Pref := Prefix (Pref);
619 P_Name := Scope (P_Name);
622 -- The guard here on P_Name is to handle the error condition where
623 -- the parent unit is missing because the file was not found.
625 if Present (P_Name) then
626 Set_Entity (Pref, P_Name);
627 Set_Etype (Pref, Etype (P_Name));
628 Generate_Reference (P_Name, Pref, 'r');
629 Style.Check_Identifier (Pref, P_Name);
631 end Generate_Parent_References;
633 -- Start of processing for Analyze_Compilation_Unit
636 Process_Compilation_Unit_Pragmas (N);
638 -- If the unit is a subunit whose parent has not been analyzed (which
639 -- indicates that the main unit is a subunit, either the current one or
640 -- one of its descendents) then the subunit is compiled as part of the
641 -- analysis of the parent, which we proceed to do. Basically this gets
642 -- handled from the top down and we don't want to do anything at this
643 -- level (i.e. this subunit will be handled on the way down from the
644 -- parent), so at this level we immediately return. If the subunit ends
645 -- up not analyzed, it means that the parent did not contain a stub for
646 -- it, or that there errors were detected in some ancestor.
648 if Nkind (Unit_Node) = N_Subunit
649 and then not Analyzed (Lib_Unit)
651 Semantics (Lib_Unit);
653 if not Analyzed (Proper_Body (Unit_Node)) then
654 if Serious_Errors_Detected > 0 then
655 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N);
657 Error_Msg_N ("missing stub for subunit", N);
664 -- Analyze context (this will call Sem recursively for with'ed units) To
665 -- detect circularities among with-clauses that are not caught during
666 -- loading, we set the Context_Pending flag on the current unit. If the
667 -- flag is already set there is a potential circularity. We exclude
668 -- predefined units from this check because they are known to be safe.
669 -- We also exclude package bodies that are present because circularities
670 -- between bodies are harmless (and necessary).
672 if Context_Pending (N) then
674 Circularity : Boolean := True;
677 if Is_Predefined_File_Name
678 (Unit_File_Name (Get_Source_Unit (Unit (N))))
680 Circularity := False;
683 for U in Main_Unit + 1 .. Last_Unit loop
684 if Nkind (Unit (Cunit (U))) = N_Package_Body
685 and then not Analyzed (Cunit (U))
687 Circularity := False;
694 Error_Msg_N ("circular dependency caused by with_clauses", N);
696 ("\possibly missing limited_with clause"
697 & " in one of the following", N);
699 for U in Main_Unit .. Last_Unit loop
700 if Context_Pending (Cunit (U)) then
701 Error_Msg_Unit_1 := Get_Unit_Name (Unit (Cunit (U)));
702 Error_Msg_N ("\unit$", N);
706 raise Unrecoverable_Error;
710 Set_Context_Pending (N);
715 Set_Context_Pending (N, False);
717 -- If the unit is a package body, the spec is already loaded and must be
718 -- analyzed first, before we analyze the body.
720 if Nkind (Unit_Node) = N_Package_Body then
722 -- If no Lib_Unit, then there was a serious previous error, so just
723 -- ignore the entire analysis effort
725 if No (Lib_Unit) then
729 Semantics (Lib_Unit);
730 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
732 -- Verify that the library unit is a package declaration
734 if not Nkind_In (Unit (Lib_Unit), N_Package_Declaration,
735 N_Generic_Package_Declaration)
738 ("no legal package declaration for package body", N);
741 -- Otherwise, the entity in the declaration is visible. Update the
742 -- version to reflect dependence of this body on the spec.
745 Spec_Id := Defining_Entity (Unit (Lib_Unit));
746 Set_Is_Immediately_Visible (Spec_Id, True);
747 Version_Update (N, Lib_Unit);
749 if Nkind (Defining_Unit_Name (Unit_Node)) =
750 N_Defining_Program_Unit_Name
752 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
757 -- If the unit is a subprogram body, then we similarly need to analyze
758 -- its spec. However, things are a little simpler in this case, because
759 -- here, this analysis is done only for error checking and consistency
760 -- purposes, so there's nothing else to be done.
762 elsif Nkind (Unit_Node) = N_Subprogram_Body then
763 if Acts_As_Spec (N) then
765 -- If the subprogram body is a child unit, we must create a
766 -- declaration for it, in order to properly load the parent(s).
767 -- After this, the original unit does not acts as a spec, because
768 -- there is an explicit one. If this unit appears in a context
769 -- clause, then an implicit with on the parent will be added when
770 -- installing the context. If this is the main unit, there is no
771 -- Unit_Table entry for the declaration (it has the unit number
772 -- of the main unit) and code generation is unaffected.
774 Unum := Get_Cunit_Unit_Number (N);
775 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
777 if Par_Spec_Name /= No_Unit_Name then
780 (Load_Name => Par_Spec_Name,
785 if Unum /= No_Unit then
787 -- Build subprogram declaration and attach parent unit to it
788 -- This subprogram declaration does not come from source,
789 -- Nevertheless the backend must generate debugging info for
790 -- it, and this must be indicated explicitly. We also mark
791 -- the body entity as a child unit now, to prevent a
792 -- cascaded error if the spec entity cannot be entered
793 -- in its scope. Finally we create a Units table entry for
794 -- the subprogram declaration, to maintain a one-to-one
795 -- correspondence with compilation unit nodes. This is
796 -- critical for the tree traversals performed by CodePeer.
799 Loc : constant Source_Ptr := Sloc (N);
800 SCS : constant Boolean :=
801 Get_Comes_From_Source_Default;
804 Set_Comes_From_Source_Default (False);
806 Make_Compilation_Unit (Loc,
807 Context_Items => New_Copy_List (Context_Items (N)),
809 Make_Subprogram_Declaration (Sloc (N),
812 (Specification (Unit_Node))),
814 Make_Compilation_Unit_Aux (Loc));
816 Set_Library_Unit (N, Lib_Unit);
817 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
818 Make_Child_Decl_Unit (N);
819 Semantics (Lib_Unit);
821 -- Now that a separate declaration exists, the body
822 -- of the child unit does not act as spec any longer.
824 Set_Acts_As_Spec (N, False);
825 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
826 Set_Debug_Info_Needed (Defining_Entity (Unit (Lib_Unit)));
827 Set_Comes_From_Source_Default (SCS);
832 -- Here for subprogram with separate declaration
835 Semantics (Lib_Unit);
836 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
837 Version_Update (N, Lib_Unit);
840 -- If this is a child unit, generate references to the parents
842 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
843 N_Defining_Program_Unit_Name
845 Generate_Parent_References (
846 Specification (Unit_Node),
847 Scope (Defining_Entity (Unit (Lib_Unit))));
851 -- If it is a child unit, the parent must be elaborated first and we
852 -- update version, since we are dependent on our parent.
854 if Is_Child_Spec (Unit_Node) then
856 -- The analysis of the parent is done with style checks off
859 Save_Style_Check : constant Boolean := Style_Check;
860 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
861 Cunit_Boolean_Restrictions_Save;
864 if not GNAT_Mode then
865 Style_Check := False;
868 Semantics (Parent_Spec (Unit_Node));
869 Version_Update (N, Parent_Spec (Unit_Node));
870 Style_Check := Save_Style_Check;
871 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
875 -- With the analysis done, install the context. Note that we can't
876 -- install the context from the with clauses as we analyze them, because
877 -- each with clause must be analyzed in a clean visibility context, so
878 -- we have to wait and install them all at once.
882 if Is_Child_Spec (Unit_Node) then
884 -- Set the entities of all parents in the program_unit_name
886 Generate_Parent_References (
887 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
890 -- All components of the context: with-clauses, library unit, ancestors
891 -- if any, (and their context) are analyzed and installed.
893 -- Call special debug routine sm if this is the main unit
895 if Current_Sem_Unit = Main_Unit then
899 -- Now analyze the unit (package, subprogram spec, body) itself
903 if Warn_On_Redundant_Constructs then
904 Check_Redundant_Withs (Context_Items (N));
906 if Nkind (Unit_Node) = N_Package_Body then
907 Check_Redundant_Withs
908 (Context_Items => Context_Items (N),
909 Spec_Context_Items => Context_Items (Lib_Unit));
913 -- The above call might have made Unit_Node an N_Subprogram_Body from
914 -- something else, so propagate any Acts_As_Spec flag.
916 if Nkind (Unit_Node) = N_Subprogram_Body
917 and then Acts_As_Spec (Unit_Node)
919 Set_Acts_As_Spec (N);
922 -- Register predefined units in Rtsfind
925 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
927 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
928 Set_RTU_Loaded (Unit_Node);
932 -- Treat compilation unit pragmas that appear after the library unit
934 if Present (Pragmas_After (Aux_Decls_Node (N))) then
936 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
938 while Present (Prag_Node) loop
945 -- Generate distribution stubs if requested and no error
948 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
950 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
951 and then not Fatal_Error (Main_Unit)
953 if Is_RCI_Pkg_Spec_Or_Body (N) then
955 -- Regular RCI package
957 Add_Stub_Constructs (N);
959 elsif (Nkind (Unit_Node) = N_Package_Declaration
960 and then Is_Shared_Passive (Defining_Entity
961 (Specification (Unit_Node))))
962 or else (Nkind (Unit_Node) = N_Package_Body
964 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
966 -- Shared passive package
968 Add_Stub_Constructs (N);
970 elsif Nkind (Unit_Node) = N_Package_Instantiation
972 Is_Remote_Call_Interface
973 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
975 -- Instantiation of a RCI generic package
977 Add_Stub_Constructs (N);
981 -- Remove unit from visibility, so that environment is clean for the
982 -- next compilation, which is either the main unit or some other unit
985 if Nkind_In (Unit_Node, N_Package_Declaration,
986 N_Package_Renaming_Declaration,
987 N_Subprogram_Declaration)
988 or else Nkind (Unit_Node) in N_Generic_Declaration
990 (Nkind (Unit_Node) = N_Subprogram_Body
991 and then Acts_As_Spec (Unit_Node))
993 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
995 -- If the unit is an instantiation whose body will be elaborated for
996 -- inlining purposes, use the proper entity of the instance. The entity
997 -- may be missing if the instantiation was illegal.
999 elsif Nkind (Unit_Node) = N_Package_Instantiation
1000 and then not Error_Posted (Unit_Node)
1001 and then Present (Instance_Spec (Unit_Node))
1003 Remove_Unit_From_Visibility
1004 (Defining_Entity (Instance_Spec (Unit_Node)));
1006 elsif Nkind (Unit_Node) = N_Package_Body
1007 or else (Nkind (Unit_Node) = N_Subprogram_Body
1008 and then not Acts_As_Spec (Unit_Node))
1010 -- Bodies that are not the main unit are compiled if they are generic
1011 -- or contain generic or inlined units. Their analysis brings in the
1012 -- context of the corresponding spec (unit declaration) which must be
1013 -- removed as well, to return the compilation environment to its
1016 Remove_Context (Lib_Unit);
1017 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
1020 -- Last step is to deinstall the context we just installed as well as
1021 -- the unit just compiled.
1025 -- If this is the main unit and we are generating code, we must check
1026 -- that all generic units in the context have a body if they need it,
1027 -- even if they have not been instantiated. In the absence of .ali files
1028 -- for generic units, we must force the load of the body, just to
1029 -- produce the proper error if the body is absent. We skip this
1030 -- verification if the main unit itself is generic.
1032 if Get_Cunit_Unit_Number (N) = Main_Unit
1033 and then Operating_Mode = Generate_Code
1034 and then Expander_Active
1036 -- Check whether the source for the body of the unit must be included
1037 -- in a standalone library.
1039 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
1041 -- Indicate that the main unit is now analyzed, to catch possible
1042 -- circularities between it and generic bodies. Remove main unit from
1043 -- visibility. This might seem superfluous, but the main unit must
1044 -- not be visible in the generic body expansions that follow.
1046 Set_Analyzed (N, True);
1047 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
1052 Un : Unit_Number_Type;
1054 Save_Style_Check : constant Boolean := Style_Check;
1055 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
1056 Cunit_Boolean_Restrictions_Save;
1059 Item := First (Context_Items (N));
1060 while Present (Item) loop
1062 -- Check for explicit with clause
1064 if Nkind (Item) = N_With_Clause
1065 and then not Implicit_With (Item)
1067 -- Ada 2005 (AI-50217): Ignore limited-withed units
1069 and then not Limited_Present (Item)
1071 Nam := Entity (Name (Item));
1073 -- Compile generic subprogram, unless it is intrinsic or
1074 -- imported so no body is required, or generic package body
1075 -- if the package spec requires a body.
1077 if (Is_Generic_Subprogram (Nam)
1078 and then not Is_Intrinsic_Subprogram (Nam)
1079 and then not Is_Imported (Nam))
1080 or else (Ekind (Nam) = E_Generic_Package
1081 and then Unit_Requires_Body (Nam))
1083 Style_Check := False;
1085 if Present (Renamed_Object (Nam)) then
1088 (Load_Name => Get_Body_Name
1090 (Unit_Declaration_Node
1091 (Renamed_Object (Nam)))),
1099 (Load_Name => Get_Body_Name
1100 (Get_Unit_Name (Item)),
1107 if Un = No_Unit then
1109 ("body of generic unit& not found", Item, Nam);
1112 elsif not Analyzed (Cunit (Un))
1113 and then Un /= Main_Unit
1114 and then not Fatal_Error (Un)
1116 Style_Check := False;
1117 Semantics (Cunit (Un));
1125 Style_Check := Save_Style_Check;
1126 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1130 -- Deal with creating elaboration Boolean if needed. We create an
1131 -- elaboration boolean only for units that come from source since
1132 -- units manufactured by the compiler never need elab checks.
1134 if Comes_From_Source (N)
1135 and then Nkind_In (Unit_Node, N_Package_Declaration,
1136 N_Generic_Package_Declaration,
1137 N_Subprogram_Declaration,
1138 N_Generic_Subprogram_Declaration)
1141 Loc : constant Source_Ptr := Sloc (N);
1142 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1145 Spec_Id := Defining_Entity (Unit_Node);
1146 Generate_Definition (Spec_Id);
1148 -- See if an elaboration entity is required for possible access
1149 -- before elaboration checking. Note that we must allow for this
1150 -- even if -gnatE is not set, since a client may be compiled in
1151 -- -gnatE mode and reference the entity.
1153 -- These entities are also used by the binder to prevent multiple
1154 -- attempts to execute the elaboration code for the library case
1155 -- where the elaboration routine might otherwise be called more
1158 -- Case of units which do not require elaboration checks
1161 -- Pure units do not need checks
1165 -- Preelaborated units do not need checks
1167 or else Is_Preelaborated (Spec_Id)
1169 -- No checks needed if pragma Elaborate_Body present
1171 or else Has_Pragma_Elaborate_Body (Spec_Id)
1173 -- No checks needed if unit does not require a body
1175 or else not Unit_Requires_Body (Spec_Id)
1177 -- No checks needed for predefined files
1179 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1181 -- No checks required if no separate spec
1183 or else Acts_As_Spec (N)
1185 -- This is a case where we only need the entity for
1186 -- checking to prevent multiple elaboration checks.
1188 Set_Elaboration_Entity_Required (Spec_Id, False);
1190 -- Case of elaboration entity is required for access before
1191 -- elaboration checking (so certainly we must build it!)
1194 Set_Elaboration_Entity_Required (Spec_Id, True);
1197 Build_Elaboration_Entity (N, Spec_Id);
1201 -- Freeze the compilation unit entity. This for sure is needed because
1202 -- of some warnings that can be output (see Freeze_Subprogram), but may
1203 -- in general be required. If freezing actions result, place them in the
1204 -- compilation unit actions list, and analyze them.
1207 Loc : constant Source_Ptr := Sloc (N);
1208 L : constant List_Id :=
1209 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), Loc);
1211 while Is_Non_Empty_List (L) loop
1212 Insert_Library_Level_Action (Remove_Head (L));
1218 if Nkind (Unit_Node) = N_Package_Declaration
1219 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1220 and then Expander_Active
1223 Save_Style_Check : constant Boolean := Style_Check;
1224 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1225 Options : Style_Check_Options;
1228 Save_Style_Check_Options (Options);
1229 Reset_Style_Check_Options;
1230 Opt.Warning_Mode := Suppress;
1231 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1233 Reset_Style_Check_Options;
1234 Set_Style_Check_Options (Options);
1235 Style_Check := Save_Style_Check;
1236 Warning_Mode := Save_Warning;
1240 -- If we are generating obsolescent warnings, then here is where we
1241 -- generate them for the with'ed items. The reason for this special
1242 -- processing is that the normal mechanism of generating the warnings
1243 -- for referenced entities does not work for context clause references.
1244 -- That's because when we first analyze the context, it is too early to
1245 -- know if the with'ing unit is itself obsolescent (which suppresses
1248 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1250 -- Push current compilation unit as scope, so that the test for
1251 -- being within an obsolescent unit will work correctly.
1253 Push_Scope (Defining_Entity (Unit_Node));
1255 -- Loop through context items to deal with with clauses
1263 Item := First (Context_Items (N));
1264 while Present (Item) loop
1265 if Nkind (Item) = N_With_Clause
1267 -- Suppress this check in limited-withed units. Further work
1268 -- needed here if we decide to incorporate this check on
1269 -- limited-withed units.
1271 and then not Limited_Present (Item)
1274 Ent := Entity (Nam);
1276 if Is_Obsolescent (Ent) then
1277 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1285 -- Remove temporary install of current unit as scope
1289 end Analyze_Compilation_Unit;
1291 ---------------------
1292 -- Analyze_Context --
1293 ---------------------
1295 procedure Analyze_Context (N : Node_Id) is
1296 Ukind : constant Node_Kind := Nkind (Unit (N));
1300 -- First process all configuration pragmas at the start of the context
1301 -- items. Strictly these are not part of the context clause, but that
1302 -- is where the parser puts them. In any case for sure we must analyze
1303 -- these before analyzing the actual context items, since they can have
1304 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1305 -- be with'ed as a result of changing categorizations in Ada 2005).
1307 Item := First (Context_Items (N));
1308 while Present (Item)
1309 and then Nkind (Item) = N_Pragma
1310 and then Pragma_Name (Item) in Configuration_Pragma_Names
1316 -- This is the point at which we capture the configuration settings
1317 -- for the unit. At the moment only the Optimize_Alignment setting
1318 -- needs to be captured. Probably more later ???
1320 if Optimize_Alignment_Local then
1321 Set_OA_Setting (Current_Sem_Unit, 'L');
1323 Set_OA_Setting (Current_Sem_Unit, Optimize_Alignment);
1326 -- Loop through actual context items. This is done in two passes:
1328 -- a) The first pass analyzes non-limited with-clauses and also any
1329 -- configuration pragmas (we need to get the latter analyzed right
1330 -- away, since they can affect processing of subsequent items.
1332 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1334 while Present (Item) loop
1336 -- For with clause, analyze the with clause, and then update the
1337 -- version, since we are dependent on a unit that we with.
1339 if Nkind (Item) = N_With_Clause
1340 and then not Limited_Present (Item)
1342 -- Skip analyzing with clause if no unit, nothing to do (this
1343 -- happens for a with that references a non-existent unit). Skip
1344 -- as well if this is a with_clause for the main unit, which
1345 -- happens if a subunit has a useless with_clause on its parent.
1347 if Present (Library_Unit (Item)) then
1348 if Library_Unit (Item) /= Cunit (Current_Sem_Unit) then
1352 Set_Entity (Name (Item), Cunit_Entity (Current_Sem_Unit));
1356 if not Implicit_With (Item) then
1357 Version_Update (N, Library_Unit (Item));
1360 -- Skip pragmas. Configuration pragmas at the start were handled in
1361 -- the loop above, and remaining pragmas are not processed until we
1362 -- actually install the context (see Install_Context). We delay the
1363 -- analysis of these pragmas to make sure that we have installed all
1364 -- the implicit with's on parent units.
1366 -- Skip use clauses at this stage, since we don't want to do any
1367 -- installing of potentially use-visible entities until we
1368 -- actually install the complete context (in Install_Context).
1369 -- Otherwise things can get installed in the wrong context.
1378 -- Second pass: examine all limited_with clauses. All other context
1379 -- items are ignored in this pass.
1381 Item := First (Context_Items (N));
1382 while Present (Item) loop
1383 if Nkind (Item) = N_With_Clause
1384 and then Limited_Present (Item)
1386 -- No need to check errors on implicitly generated limited-with
1389 if not Implicit_With (Item) then
1391 -- Verify that the illegal contexts given in 10.1.2 (18/2) are
1392 -- properly rejected, including renaming declarations.
1394 if not Nkind_In (Ukind, N_Package_Declaration,
1395 N_Subprogram_Declaration)
1396 and then Ukind not in N_Generic_Declaration
1397 and then Ukind not in N_Generic_Instantiation
1399 Error_Msg_N ("limited with_clause not allowed here", Item);
1401 -- Check wrong use of a limited with clause applied to the
1402 -- compilation unit containing the limited-with clause.
1404 -- limited with P.Q;
1405 -- package P.Q is ...
1407 elsif Unit (Library_Unit (Item)) = Unit (N) then
1408 Error_Msg_N ("wrong use of limited-with clause", Item);
1410 -- Check wrong use of limited-with clause applied to some
1411 -- immediate ancestor.
1413 elsif Is_Child_Spec (Unit (N)) then
1415 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1419 P := Parent_Spec (Unit (N));
1421 if Unit (P) = Lib_U then
1422 Error_Msg_N ("limited with_clause cannot "
1423 & "name ancestor", Item);
1427 exit when not Is_Child_Spec (Unit (P));
1428 P := Parent_Spec (Unit (P));
1433 -- Check if the limited-withed unit is already visible through
1434 -- some context clause of the current compilation unit or some
1435 -- ancestor of the current compilation unit.
1438 Lim_Unit_Name : constant Node_Id := Name (Item);
1439 Comp_Unit : Node_Id;
1441 Unit_Name : Node_Id;
1446 It := First (Context_Items (Comp_Unit));
1447 while Present (It) loop
1449 and then Nkind (It) = N_With_Clause
1450 and then not Limited_Present (It)
1452 Nkind_In (Unit (Library_Unit (It)),
1453 N_Package_Declaration,
1454 N_Package_Renaming_Declaration)
1456 if Nkind (Unit (Library_Unit (It))) =
1457 N_Package_Declaration
1459 Unit_Name := Name (It);
1461 Unit_Name := Name (Unit (Library_Unit (It)));
1464 -- Check if the named package (or some ancestor)
1465 -- leaves visible the full-view of the unit given
1466 -- in the limited-with clause
1469 if Designate_Same_Unit (Lim_Unit_Name,
1472 Error_Msg_Sloc := Sloc (It);
1474 ("simultaneous visibility of limited "
1475 & "and unlimited views not allowed",
1478 ("\unlimited view visible through "
1479 & "context clause #",
1483 elsif Nkind (Unit_Name) = N_Identifier then
1487 Unit_Name := Prefix (Unit_Name);
1494 exit when not Is_Child_Spec (Unit (Comp_Unit));
1496 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1501 -- Skip analyzing with clause if no unit, see above
1503 if Present (Library_Unit (Item)) then
1507 -- A limited_with does not impose an elaboration order, but
1508 -- there is a semantic dependency for recompilation purposes.
1510 if not Implicit_With (Item) then
1511 Version_Update (N, Library_Unit (Item));
1514 -- Pragmas and use clauses and with clauses other than limited
1515 -- with's are ignored in this pass through the context items.
1523 end Analyze_Context;
1525 -------------------------------
1526 -- Analyze_Package_Body_Stub --
1527 -------------------------------
1529 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1530 Id : constant Entity_Id := Defining_Identifier (N);
1534 -- The package declaration must be in the current declarative part
1536 Check_Stub_Level (N);
1537 Nam := Current_Entity_In_Scope (Id);
1539 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1540 Error_Msg_N ("missing specification for package stub", N);
1542 elsif Has_Completion (Nam)
1543 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1545 Error_Msg_N ("duplicate or redundant stub for package", N);
1548 -- Indicate that the body of the package exists. If we are doing
1549 -- only semantic analysis, the stub stands for the body. If we are
1550 -- generating code, the existence of the body will be confirmed
1551 -- when we load the proper body.
1553 Set_Has_Completion (Nam);
1554 Set_Scope (Defining_Entity (N), Current_Scope);
1555 Generate_Reference (Nam, Id, 'b');
1556 Analyze_Proper_Body (N, Nam);
1558 end Analyze_Package_Body_Stub;
1560 -------------------------
1561 -- Analyze_Proper_Body --
1562 -------------------------
1564 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1565 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1566 Unum : Unit_Number_Type;
1568 procedure Optional_Subunit;
1569 -- This procedure is called when the main unit is a stub, or when we
1570 -- are not generating code. In such a case, we analyze the subunit if
1571 -- present, which is user-friendly and in fact required for ASIS, but
1572 -- we don't complain if the subunit is missing.
1574 ----------------------
1575 -- Optional_Subunit --
1576 ----------------------
1578 procedure Optional_Subunit is
1579 Comp_Unit : Node_Id;
1582 -- Try to load subunit, but ignore any errors that occur during the
1583 -- loading of the subunit, by using the special feature in Errout to
1584 -- ignore all errors. Note that Fatal_Error will still be set, so we
1585 -- will be able to check for this case below.
1587 if not ASIS_Mode then
1588 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1593 (Load_Name => Subunit_Name,
1598 if not ASIS_Mode then
1599 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1602 -- All done if we successfully loaded the subunit
1605 and then (not Fatal_Error (Unum) or else Try_Semantics)
1607 Comp_Unit := Cunit (Unum);
1609 -- If the file was empty or seriously mangled, the unit itself may
1612 if No (Unit (Comp_Unit)) then
1614 ("subunit does not contain expected proper body", N);
1616 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1618 ("expected SEPARATE subunit, found child unit",
1619 Cunit_Entity (Unum));
1621 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1622 Analyze_Subunit (Comp_Unit);
1623 Set_Library_Unit (N, Comp_Unit);
1626 elsif Unum = No_Unit
1627 and then Present (Nam)
1629 if Is_Protected_Type (Nam) then
1630 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1632 Set_Corresponding_Body (
1633 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1636 end Optional_Subunit;
1638 -- Start of processing for Analyze_Proper_Body
1641 -- If the subunit is already loaded, it means that the main unit is a
1642 -- subunit, and that the current unit is one of its parents which was
1643 -- being analyzed to provide the needed context for the analysis of the
1644 -- subunit. In this case we analyze the subunit and continue with the
1645 -- parent, without looking a subsequent subunits.
1647 if Is_Loaded (Subunit_Name) then
1649 -- If the proper body is already linked to the stub node, the stub is
1650 -- in a generic unit and just needs analyzing.
1652 if Present (Library_Unit (N)) then
1653 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1654 Analyze_Subunit (Library_Unit (N));
1656 -- Otherwise we must load the subunit and link to it
1659 -- Load the subunit, this must work, since we originally loaded
1660 -- the subunit earlier on. So this will not really load it, just
1661 -- give access to it.
1665 (Load_Name => Subunit_Name,
1670 -- And analyze the subunit in the parent context (note that we
1671 -- do not call Semantics, since that would remove the parent
1672 -- context). Because of this, we have to manually reset the
1673 -- compiler state to Analyzing since it got destroyed by Load.
1675 if Unum /= No_Unit then
1676 Compiler_State := Analyzing;
1678 -- Check that the proper body is a subunit and not a child
1679 -- unit. If the unit was previously loaded, the error will
1680 -- have been emitted when copying the generic node, so we
1681 -- just return to avoid cascaded errors.
1683 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1687 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1688 Analyze_Subunit (Cunit (Unum));
1689 Set_Library_Unit (N, Cunit (Unum));
1693 -- If the main unit is a subunit, then we are just performing semantic
1694 -- analysis on that subunit, and any other subunits of any parent unit
1695 -- should be ignored, except that if we are building trees for ASIS
1696 -- usage we want to annotate the stub properly.
1698 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1699 and then Subunit_Name /= Unit_Name (Main_Unit)
1705 -- But before we return, set the flag for unloaded subunits. This
1706 -- will suppress junk warnings of variables in the same declarative
1707 -- part (or a higher level one) that are in danger of looking unused
1708 -- when in fact there might be a declaration in the subunit that we
1709 -- do not intend to load.
1711 Unloaded_Subunits := True;
1714 -- If the subunit is not already loaded, and we are generating code,
1715 -- then this is the case where compilation started from the parent, and
1716 -- we are generating code for an entire subunit tree. In that case we
1717 -- definitely need to load the subunit.
1719 -- In order to continue the analysis with the rest of the parent,
1720 -- and other subunits, we load the unit without requiring its
1721 -- presence, and emit a warning if not found, rather than terminating
1722 -- the compilation abruptly, as for other missing file problems.
1724 elsif Original_Operating_Mode = Generate_Code then
1726 -- If the proper body is already linked to the stub node, the stub is
1727 -- in a generic unit and just needs analyzing.
1729 -- We update the version. Although we are not strictly technically
1730 -- semantically dependent on the subunit, given our approach of macro
1731 -- substitution of subunits, it makes sense to include it in the
1732 -- version identification.
1734 if Present (Library_Unit (N)) then
1735 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1736 Analyze_Subunit (Library_Unit (N));
1737 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1739 -- Otherwise we must load the subunit and link to it
1742 -- Make sure that, if the subunit is preprocessed and -gnateG is
1743 -- specified, the preprocessed file will be written.
1745 Lib.Analysing_Subunit_Of_Main := True;
1748 (Load_Name => Subunit_Name,
1752 Lib.Analysing_Subunit_Of_Main := False;
1754 -- Give message if we did not get the unit Emit warning even if
1755 -- missing subunit is not within main unit, to simplify debugging.
1757 if Original_Operating_Mode = Generate_Code
1758 and then Unum = No_Unit
1760 Error_Msg_Unit_1 := Subunit_Name;
1762 Get_File_Name (Subunit_Name, Subunit => True);
1764 ("subunit$$ in file{ not found?!!", N);
1765 Subunits_Missing := True;
1768 -- Load_Unit may reset Compiler_State, since it may have been
1769 -- necessary to parse an additional units, so we make sure that
1770 -- we reset it to the Analyzing state.
1772 Compiler_State := Analyzing;
1774 if Unum /= No_Unit then
1775 if Debug_Flag_L then
1776 Write_Str ("*** Loaded subunit from stub. Analyze");
1781 Comp_Unit : constant Node_Id := Cunit (Unum);
1784 -- Check for child unit instead of subunit
1786 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1788 ("expected SEPARATE subunit, found child unit",
1789 Cunit_Entity (Unum));
1791 -- OK, we have a subunit
1794 -- Set corresponding stub (even if errors)
1796 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1798 -- Collect SCO information for loaded subunit if we are
1799 -- in the main unit).
1803 In_Extended_Main_Source_Unit
1804 (Cunit_Entity (Current_Sem_Unit))
1809 -- Analyze the unit if semantics active
1811 if not Fatal_Error (Unum) or else Try_Semantics then
1812 Analyze_Subunit (Comp_Unit);
1815 -- Set the library unit pointer in any case
1817 Set_Library_Unit (N, Comp_Unit);
1819 -- We update the version. Although we are not technically
1820 -- semantically dependent on the subunit, given our
1821 -- approach of macro substitution of subunits, it makes
1822 -- sense to include it in the version identification.
1824 Version_Update (Cunit (Main_Unit), Comp_Unit);
1830 -- The remaining case is when the subunit is not already loaded and we
1831 -- are not generating code. In this case we are just performing semantic
1832 -- analysis on the parent, and we are not interested in the subunit. For
1833 -- subprograms, analyze the stub as a body. For other entities the stub
1834 -- has already been marked as completed.
1839 end Analyze_Proper_Body;
1841 ----------------------------------
1842 -- Analyze_Protected_Body_Stub --
1843 ----------------------------------
1845 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1846 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1849 Check_Stub_Level (N);
1851 -- First occurrence of name may have been as an incomplete type
1853 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1854 Nam := Full_View (Nam);
1858 or else not Is_Protected_Type (Etype (Nam))
1860 Error_Msg_N ("missing specification for Protected body", N);
1862 Set_Scope (Defining_Entity (N), Current_Scope);
1863 Set_Has_Completion (Etype (Nam));
1864 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1865 Analyze_Proper_Body (N, Etype (Nam));
1867 end Analyze_Protected_Body_Stub;
1869 ----------------------------------
1870 -- Analyze_Subprogram_Body_Stub --
1871 ----------------------------------
1873 -- A subprogram body stub can appear with or without a previous spec. If
1874 -- there is one, then the analysis of the body will find it and verify
1875 -- conformance. The formals appearing in the specification of the stub play
1876 -- no role, except for requiring an additional conformance check. If there
1877 -- is no previous subprogram declaration, the stub acts as a spec, and
1878 -- provides the defining entity for the subprogram.
1880 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1884 Check_Stub_Level (N);
1886 -- Verify that the identifier for the stub is unique within this
1887 -- declarative part.
1889 if Nkind_In (Parent (N), N_Block_Statement,
1893 Decl := First (Declarations (Parent (N)));
1894 while Present (Decl)
1897 if Nkind (Decl) = N_Subprogram_Body_Stub
1898 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1899 Chars (Defining_Unit_Name (Specification (N))))
1901 Error_Msg_N ("identifier for stub is not unique", N);
1908 -- Treat stub as a body, which checks conformance if there is a previous
1909 -- declaration, or else introduces entity and its signature.
1911 Analyze_Subprogram_Body (N);
1912 Analyze_Proper_Body (N, Empty);
1913 end Analyze_Subprogram_Body_Stub;
1915 ---------------------
1916 -- Analyze_Subunit --
1917 ---------------------
1919 -- A subunit is compiled either by itself (for semantic checking) or as
1920 -- part of compiling the parent (for code generation). In either case, by
1921 -- the time we actually process the subunit, the parent has already been
1922 -- installed and analyzed. The node N is a compilation unit, whose context
1923 -- needs to be treated here, because we come directly here from the parent
1924 -- without calling Analyze_Compilation_Unit.
1926 -- The compilation context includes the explicit context of the subunit,
1927 -- and the context of the parent, together with the parent itself. In order
1928 -- to compile the current context, we remove the one inherited from the
1929 -- parent, in order to have a clean visibility table. We restore the parent
1930 -- context before analyzing the proper body itself. On exit, we remove only
1931 -- the explicit context of the subunit.
1933 procedure Analyze_Subunit (N : Node_Id) is
1934 Lib_Unit : constant Node_Id := Library_Unit (N);
1935 Par_Unit : constant Entity_Id := Current_Scope;
1937 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1938 Num_Scopes : Int := 0;
1939 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1940 Enclosing_Child : Entity_Id := Empty;
1941 Svg : constant Suppress_Array := Scope_Suppress;
1943 procedure Analyze_Subunit_Context;
1944 -- Capture names in use clauses of the subunit. This must be done before
1945 -- re-installing parent declarations, because items in the context must
1946 -- not be hidden by declarations local to the parent.
1948 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1949 -- Recursive procedure to restore scope of all ancestors of subunit,
1950 -- from outermost in. If parent is not a subunit, the call to install
1951 -- context installs context of spec and (if parent is a child unit) the
1952 -- context of its parents as well. It is confusing that parents should
1953 -- be treated differently in both cases, but the semantics are just not
1956 procedure Re_Install_Use_Clauses;
1957 -- As part of the removal of the parent scope, the use clauses are
1958 -- removed, to be reinstalled when the context of the subunit has been
1959 -- analyzed. Use clauses may also have been affected by the analysis of
1960 -- the context of the subunit, so they have to be applied again, to
1961 -- insure that the compilation environment of the rest of the parent
1962 -- unit is identical.
1964 procedure Remove_Scope;
1965 -- Remove current scope from scope stack, and preserve the list of use
1966 -- clauses in it, to be reinstalled after context is analyzed.
1968 -----------------------------
1969 -- Analyze_Subunit_Context --
1970 -----------------------------
1972 procedure Analyze_Subunit_Context is
1975 Unit_Name : Entity_Id;
1978 Analyze_Context (N);
1980 -- Make withed units immediately visible. If child unit, make the
1981 -- ultimate parent immediately visible.
1983 Item := First (Context_Items (N));
1984 while Present (Item) loop
1985 if Nkind (Item) = N_With_Clause then
1987 -- Protect frontend against previous errors in context clauses
1989 if Nkind (Name (Item)) /= N_Selected_Component then
1990 if Error_Posted (Item) then
1994 Unit_Name := Entity (Name (Item));
1995 while Is_Child_Unit (Unit_Name) loop
1996 Set_Is_Visible_Child_Unit (Unit_Name);
1997 Unit_Name := Scope (Unit_Name);
2000 if not Is_Immediately_Visible (Unit_Name) then
2001 Set_Is_Immediately_Visible (Unit_Name);
2002 Set_Context_Installed (Item);
2007 elsif Nkind (Item) = N_Use_Package_Clause then
2008 Nam := First (Names (Item));
2009 while Present (Nam) loop
2014 elsif Nkind (Item) = N_Use_Type_Clause then
2015 Nam := First (Subtype_Marks (Item));
2016 while Present (Nam) loop
2025 -- Reset visibility of withed units. They will be made visible again
2026 -- when we install the subunit context.
2028 Item := First (Context_Items (N));
2029 while Present (Item) loop
2030 if Nkind (Item) = N_With_Clause
2032 -- Protect frontend against previous errors in context clauses
2034 and then Nkind (Name (Item)) /= N_Selected_Component
2035 and then not Error_Posted (Item)
2037 Unit_Name := Entity (Name (Item));
2038 while Is_Child_Unit (Unit_Name) loop
2039 Set_Is_Visible_Child_Unit (Unit_Name, False);
2040 Unit_Name := Scope (Unit_Name);
2043 if Context_Installed (Item) then
2044 Set_Is_Immediately_Visible (Unit_Name, False);
2045 Set_Context_Installed (Item, False);
2051 end Analyze_Subunit_Context;
2053 ------------------------
2054 -- Re_Install_Parents --
2055 ------------------------
2057 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
2061 if Nkind (Unit (L)) = N_Subunit then
2062 Re_Install_Parents (Library_Unit (L), Scope (Scop));
2065 Install_Context (L);
2067 -- If the subunit occurs within a child unit, we must restore the
2068 -- immediate visibility of any siblings that may occur in context.
2070 if Present (Enclosing_Child) then
2071 Install_Siblings (Enclosing_Child, L);
2076 if Scop /= Par_Unit then
2077 Set_Is_Immediately_Visible (Scop);
2080 -- Make entities in scope visible again. For child units, restore
2081 -- visibility only if they are actually in context.
2083 E := First_Entity (Current_Scope);
2084 while Present (E) loop
2085 if not Is_Child_Unit (E)
2086 or else Is_Visible_Child_Unit (E)
2088 Set_Is_Immediately_Visible (E);
2094 -- A subunit appears within a body, and for a nested subunits all the
2095 -- parents are bodies. Restore full visibility of their private
2098 if Is_Package_Or_Generic_Package (Scop) then
2099 Set_In_Package_Body (Scop);
2100 Install_Private_Declarations (Scop);
2102 end Re_Install_Parents;
2104 ----------------------------
2105 -- Re_Install_Use_Clauses --
2106 ----------------------------
2108 procedure Re_Install_Use_Clauses is
2111 for J in reverse 1 .. Num_Scopes loop
2112 U := Use_Clauses (J);
2113 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2114 Install_Use_Clauses (U, Force_Installation => True);
2116 end Re_Install_Use_Clauses;
2122 procedure Remove_Scope is
2126 Num_Scopes := Num_Scopes + 1;
2127 Use_Clauses (Num_Scopes) :=
2128 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2130 E := First_Entity (Current_Scope);
2131 while Present (E) loop
2132 Set_Is_Immediately_Visible (E, False);
2136 if Is_Child_Unit (Current_Scope) then
2137 Enclosing_Child := Current_Scope;
2143 -- Start of processing for Analyze_Subunit
2148 Nam : Node_Id := Name (Unit (N));
2151 if Nkind (Nam) = N_Selected_Component then
2152 Nam := Selector_Name (Nam);
2155 Check_Identifier (Nam, Par_Unit);
2159 if not Is_Empty_List (Context_Items (N)) then
2161 -- Save current use clauses
2164 Remove_Context (Lib_Unit);
2166 -- Now remove parents and their context, including enclosing subunits
2167 -- and the outer parent body which is not a subunit.
2169 if Present (Lib_Spec) then
2170 Remove_Context (Lib_Spec);
2172 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2173 Lib_Spec := Library_Unit (Lib_Spec);
2175 Remove_Context (Lib_Spec);
2178 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2182 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2183 Remove_Context (Library_Unit (Lib_Spec));
2187 Set_Is_Immediately_Visible (Par_Unit, False);
2189 Analyze_Subunit_Context;
2191 Re_Install_Parents (Lib_Unit, Par_Unit);
2192 Set_Is_Immediately_Visible (Par_Unit);
2194 -- If the context includes a child unit of the parent of the subunit,
2195 -- the parent will have been removed from visibility, after compiling
2196 -- that cousin in the context. The visibility of the parent must be
2197 -- restored now. This also applies if the context includes another
2198 -- subunit of the same parent which in turn includes a child unit in
2201 if Is_Package_Or_Generic_Package (Par_Unit) then
2202 if not Is_Immediately_Visible (Par_Unit)
2203 or else (Present (First_Entity (Par_Unit))
2204 and then not Is_Immediately_Visible
2205 (First_Entity (Par_Unit)))
2207 Set_Is_Immediately_Visible (Par_Unit);
2208 Install_Visible_Declarations (Par_Unit);
2209 Install_Private_Declarations (Par_Unit);
2213 Re_Install_Use_Clauses;
2214 Install_Context (N);
2216 -- Restore state of suppress flags for current body
2218 Scope_Suppress := Svg;
2220 -- If the subunit is within a child unit, then siblings of any parent
2221 -- unit that appear in the context clause of the subunit must also be
2222 -- made immediately visible.
2224 if Present (Enclosing_Child) then
2225 Install_Siblings (Enclosing_Child, N);
2229 Analyze (Proper_Body (Unit (N)));
2232 -- The subunit may contain a with_clause on a sibling of some ancestor.
2233 -- Removing the context will remove from visibility those ancestor child
2234 -- units, which must be restored to the visibility they have in the
2237 if Present (Enclosing_Child) then
2243 and then Is_Child_Unit (C)
2245 Set_Is_Immediately_Visible (C);
2246 Set_Is_Visible_Child_Unit (C);
2251 end Analyze_Subunit;
2253 ----------------------------
2254 -- Analyze_Task_Body_Stub --
2255 ----------------------------
2257 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2258 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2259 Loc : constant Source_Ptr := Sloc (N);
2262 Check_Stub_Level (N);
2264 -- First occurrence of name may have been as an incomplete type
2266 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2267 Nam := Full_View (Nam);
2270 if No (Nam) or else not Is_Task_Type (Etype (Nam)) then
2271 Error_Msg_N ("missing specification for task body", N);
2273 Set_Scope (Defining_Entity (N), Current_Scope);
2274 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2276 -- Check for duplicate stub, if so give message and terminate
2278 if Has_Completion (Etype (Nam)) then
2279 Error_Msg_N ("duplicate stub for task", N);
2282 Set_Has_Completion (Etype (Nam));
2285 Analyze_Proper_Body (N, Etype (Nam));
2287 -- Set elaboration flag to indicate that entity is callable. This
2288 -- cannot be done in the expansion of the body itself, because the
2289 -- proper body is not in a declarative part. This is only done if
2290 -- expansion is active, because the context may be generic and the
2291 -- flag not defined yet.
2293 if Expander_Active then
2295 Make_Assignment_Statement (Loc,
2297 Make_Identifier (Loc,
2298 New_External_Name (Chars (Etype (Nam)), 'E')),
2299 Expression => New_Reference_To (Standard_True, Loc)));
2302 end Analyze_Task_Body_Stub;
2304 -------------------------
2305 -- Analyze_With_Clause --
2306 -------------------------
2308 -- Analyze the declaration of a unit in a with clause. At end, label the
2309 -- with clause with the defining entity for the unit.
2311 procedure Analyze_With_Clause (N : Node_Id) is
2313 -- Retrieve the original kind of the unit node, before analysis. If it
2314 -- is a subprogram instantiation, its analysis below will rewrite the
2315 -- node as the declaration of the wrapper package. If the same
2316 -- instantiation appears indirectly elsewhere in the context, it will
2317 -- have been analyzed already.
2319 Unit_Kind : constant Node_Kind :=
2320 Nkind (Original_Node (Unit (Library_Unit (N))));
2321 Nam : constant Node_Id := Name (N);
2323 Par_Name : Entity_Id;
2328 -- Set True if the unit currently being compiled is an internal unit
2330 Save_Style_Check : constant Boolean := Opt.Style_Check;
2331 Save_C_Restrict : Save_Cunit_Boolean_Restrictions;
2334 U := Unit (Library_Unit (N));
2336 -- If this is an internal unit which is a renaming, then this is a
2337 -- violation of No_Obsolescent_Features.
2339 -- Note: this is not quite right if the user defines one of these units
2340 -- himself, but that's a marginal case, and fixing it is hard ???
2342 if Restriction_Check_Required (No_Obsolescent_Features) then
2344 F : constant File_Name_Type :=
2345 Unit_File_Name (Get_Source_Unit (U));
2347 if Is_Predefined_File_Name (F, Renamings_Included => True)
2349 Is_Predefined_File_Name (F, Renamings_Included => False)
2351 Check_Restriction (No_Obsolescent_Features, N);
2356 -- Save current restriction set, does not apply to with'ed unit
2358 Save_C_Restrict := Cunit_Boolean_Restrictions_Save;
2360 -- Several actions are skipped for dummy packages (those supplied for
2361 -- with's where no matching file could be found). Such packages are
2362 -- identified by the Sloc value being set to No_Location.
2364 if Limited_Present (N) then
2366 -- Ada 2005 (AI-50217): Build visibility structures but do not
2367 -- analyze the unit.
2369 if Sloc (U) /= No_Location then
2370 Build_Limited_Views (N);
2376 -- We reset ordinary style checking during the analysis of a with'ed
2377 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2378 -- definitely *does* apply to with'ed units).
2380 if not GNAT_Mode then
2381 Style_Check := False;
2384 -- If the library unit is a predefined unit, and we are in high
2385 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2386 -- for the analysis of the with'ed unit. This mode does not prevent
2387 -- explicit with'ing of run-time units.
2389 if Configurable_Run_Time_Mode
2390 and then Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (U)))
2392 Configurable_Run_Time_Mode := False;
2393 Semantics (Library_Unit (N));
2394 Configurable_Run_Time_Mode := True;
2397 Semantics (Library_Unit (N));
2400 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2402 if Sloc (U) /= No_Location then
2404 -- Check restrictions, except that we skip the check if this is an
2405 -- internal unit unless we are compiling the internal unit as the
2406 -- main unit. We also skip this for dummy packages.
2408 Check_Restriction_No_Dependence (Nam, N);
2410 if not Intunit or else Current_Sem_Unit = Main_Unit then
2411 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2414 -- Deal with special case of GNAT.Current_Exceptions which interacts
2415 -- with the optimization of local raise statements into gotos.
2417 if Nkind (Nam) = N_Selected_Component
2418 and then Nkind (Prefix (Nam)) = N_Identifier
2419 and then Chars (Prefix (Nam)) = Name_Gnat
2420 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2422 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2424 Check_Restriction (No_Exception_Propagation, N);
2425 Special_Exception_Package_Used := True;
2428 -- Check for inappropriate with of internal implementation unit if we
2429 -- are not compiling an internal unit. We do not issue this message
2430 -- for implicit with's generated by the compiler itself.
2432 if Implementation_Unit_Warnings
2433 and then not Intunit
2434 and then not Implicit_With (N)
2437 U_Kind : constant Kind_Of_Unit :=
2438 Get_Kind_Of_Unit (Get_Source_Unit (U));
2441 if U_Kind = Implementation_Unit then
2442 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2444 -- Add alternative name if available, otherwise issue a
2445 -- general warning message.
2447 if Error_Msg_Strlen /= 0 then
2448 Error_Msg_F ("\use ""~"" instead", Name (N));
2451 ("\use of this unit is non-portable " &
2452 "and version-dependent?", Name (N));
2455 elsif U_Kind = Ada_05_Unit
2456 and then Ada_Version < Ada_05
2457 and then Warn_On_Ada_2005_Compatibility
2459 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2461 elsif U_Kind = Ada_12_Unit
2462 and then Ada_Version < Ada_12
2463 and then Warn_On_Ada_2012_Compatibility
2465 Error_Msg_N ("& is an Ada 2012 unit?", Name (N));
2471 -- Semantic analysis of a generic unit is performed on a copy of
2472 -- the original tree. Retrieve the entity on which semantic info
2473 -- actually appears.
2475 if Unit_Kind in N_Generic_Declaration then
2476 E_Name := Defining_Entity (U);
2478 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2479 -- the case of an instantiation, semantic analysis above will have
2480 -- replaced the unit by its instantiated version. If the instance body
2481 -- has been generated, the instance now denotes the body entity. For
2482 -- visibility purposes we need the entity of its spec.
2484 elsif (Unit_Kind = N_Package_Instantiation
2485 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2486 N_Package_Instantiation)
2487 and then Nkind (U) = N_Package_Body
2489 E_Name := Corresponding_Spec (U);
2491 elsif Unit_Kind = N_Package_Instantiation
2492 and then Nkind (U) = N_Package_Instantiation
2494 -- If the instance has not been rewritten as a package declaration,
2495 -- then it appeared already in a previous with clause. Retrieve
2496 -- the entity from the previous instance.
2498 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2500 elsif Unit_Kind in N_Subprogram_Instantiation then
2502 -- The visible subprogram is created during instantiation, and is
2503 -- an attribute of the wrapper package. We retrieve the wrapper
2504 -- package directly from the instantiation node. If the instance
2505 -- is inlined the unit is still an instantiation. Otherwise it has
2506 -- been rewritten as the declaration of the wrapper itself.
2508 if Nkind (U) in N_Subprogram_Instantiation then
2511 (Defining_Entity (Specification (Instance_Spec (U))));
2513 E_Name := Related_Instance (Defining_Entity (U));
2516 elsif Unit_Kind = N_Package_Renaming_Declaration
2517 or else Unit_Kind in N_Generic_Renaming_Declaration
2519 E_Name := Defining_Entity (U);
2521 elsif Unit_Kind = N_Subprogram_Body
2522 and then Nkind (Name (N)) = N_Selected_Component
2523 and then not Acts_As_Spec (Library_Unit (N))
2525 -- For a child unit that has no spec, one has been created and
2526 -- analyzed. The entity required is that of the spec.
2528 E_Name := Corresponding_Spec (U);
2531 E_Name := Defining_Entity (U);
2534 if Nkind (Name (N)) = N_Selected_Component then
2536 -- Child unit in a with clause
2538 Change_Selected_Component_To_Expanded_Name (Name (N));
2541 -- Restore style checks and restrictions
2543 Style_Check := Save_Style_Check;
2544 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2546 -- Record the reference, but do NOT set the unit as referenced, we want
2547 -- to consider the unit as unreferenced if this is the only reference
2550 Set_Entity_With_Style_Check (Name (N), E_Name);
2551 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2553 -- Generate references and check No_Dependence restriction for parents
2555 if Is_Child_Unit (E_Name) then
2556 Pref := Prefix (Name (N));
2557 Par_Name := Scope (E_Name);
2558 while Nkind (Pref) = N_Selected_Component loop
2559 Change_Selected_Component_To_Expanded_Name (Pref);
2560 Set_Entity_With_Style_Check (Pref, Par_Name);
2562 Generate_Reference (Par_Name, Pref);
2563 Check_Restriction_No_Dependence (Pref, N);
2564 Pref := Prefix (Pref);
2566 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2567 -- is set to Standard_Standard, and no attempt should be made to
2568 -- further unwind scopes.
2570 if Par_Name /= Standard_Standard then
2571 Par_Name := Scope (Par_Name);
2575 if Present (Entity (Pref))
2576 and then not Analyzed (Parent (Parent (Entity (Pref))))
2578 -- If the entity is set without its unit being compiled, the
2579 -- original parent is a renaming, and Par_Name is the renamed
2580 -- entity. For visibility purposes, we need the original entity,
2581 -- which must be analyzed now because Load_Unit directly retrieves
2582 -- the renamed unit, and the renaming declaration itself has not
2585 Analyze (Parent (Parent (Entity (Pref))));
2586 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2587 Par_Name := Entity (Pref);
2590 Set_Entity_With_Style_Check (Pref, Par_Name);
2591 Generate_Reference (Par_Name, Pref);
2594 -- If the withed unit is System, and a system extension pragma is
2595 -- present, compile the extension now, rather than waiting for a
2596 -- visibility check on a specific entity.
2598 if Chars (E_Name) = Name_System
2599 and then Scope (E_Name) = Standard_Standard
2600 and then Present (System_Extend_Unit)
2601 and then Present_System_Aux (N)
2603 -- If the extension is not present, an error will have been emitted
2608 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2609 -- to private_with units; they will be made visible later (just before
2610 -- the private part is analyzed)
2612 if Private_Present (N) then
2613 Set_Is_Immediately_Visible (E_Name, False);
2615 end Analyze_With_Clause;
2617 ------------------------------
2618 -- Check_Private_Child_Unit --
2619 ------------------------------
2621 procedure Check_Private_Child_Unit (N : Node_Id) is
2622 Lib_Unit : constant Node_Id := Unit (N);
2624 Curr_Unit : Entity_Id;
2625 Sub_Parent : Node_Id;
2626 Priv_Child : Entity_Id;
2627 Par_Lib : Entity_Id;
2630 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2631 -- Returns true if and only if the library unit is declared with
2632 -- an explicit designation of private.
2634 -----------------------------
2635 -- Is_Private_Library_Unit --
2636 -----------------------------
2638 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2639 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2642 return Private_Present (Comp_Unit);
2643 end Is_Private_Library_Unit;
2645 -- Start of processing for Check_Private_Child_Unit
2648 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2649 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2650 Par_Lib := Curr_Unit;
2652 elsif Nkind (Lib_Unit) = N_Subunit then
2654 -- The parent is itself a body. The parent entity is to be found in
2655 -- the corresponding spec.
2657 Sub_Parent := Library_Unit (N);
2658 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2660 -- If the parent itself is a subunit, Curr_Unit is the entity of the
2661 -- enclosing body, retrieve the spec entity which is the proper
2662 -- ancestor we need for the following tests.
2664 if Ekind (Curr_Unit) = E_Package_Body then
2665 Curr_Unit := Spec_Entity (Curr_Unit);
2668 Par_Lib := Curr_Unit;
2671 Curr_Unit := Defining_Entity (Lib_Unit);
2673 Par_Lib := Curr_Unit;
2674 Par_Spec := Parent_Spec (Lib_Unit);
2676 if No (Par_Spec) then
2679 Par_Lib := Defining_Entity (Unit (Par_Spec));
2683 -- Loop through context items
2685 Item := First (Context_Items (N));
2686 while Present (Item) loop
2688 -- Ada 2005 (AI-262): Allow private_with of a private child package
2689 -- in public siblings
2691 if Nkind (Item) = N_With_Clause
2692 and then not Implicit_With (Item)
2693 and then not Limited_Present (Item)
2694 and then Is_Private_Descendant (Entity (Name (Item)))
2696 Priv_Child := Entity (Name (Item));
2699 Curr_Parent : Entity_Id := Par_Lib;
2700 Child_Parent : Entity_Id := Scope (Priv_Child);
2701 Prv_Ancestor : Entity_Id := Child_Parent;
2702 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2705 -- If the child unit is a public child then locate the nearest
2706 -- private ancestor. Child_Parent will then be set to the
2707 -- parent of that ancestor.
2709 if not Is_Private_Library_Unit (Priv_Child) then
2710 while Present (Prv_Ancestor)
2711 and then not Is_Private_Library_Unit (Prv_Ancestor)
2713 Prv_Ancestor := Scope (Prv_Ancestor);
2716 if Present (Prv_Ancestor) then
2717 Child_Parent := Scope (Prv_Ancestor);
2721 while Present (Curr_Parent)
2722 and then Curr_Parent /= Standard_Standard
2723 and then Curr_Parent /= Child_Parent
2726 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2727 Curr_Parent := Scope (Curr_Parent);
2730 if No (Curr_Parent) then
2731 Curr_Parent := Standard_Standard;
2734 if Curr_Parent /= Child_Parent then
2735 if Ekind (Priv_Child) = E_Generic_Package
2736 and then Chars (Priv_Child) in Text_IO_Package_Name
2737 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2740 ("& is a nested package, not a compilation unit",
2741 Name (Item), Priv_Child);
2745 ("unit in with clause is private child unit!", Item);
2747 ("\current unit must also have parent&!",
2748 Item, Child_Parent);
2752 or else Private_Present (Item)
2753 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2754 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2755 and then not Acts_As_Spec (Parent (Lib_Unit)))
2761 ("current unit must also be private descendant of&",
2762 Item, Child_Parent);
2770 end Check_Private_Child_Unit;
2772 ----------------------
2773 -- Check_Stub_Level --
2774 ----------------------
2776 procedure Check_Stub_Level (N : Node_Id) is
2777 Par : constant Node_Id := Parent (N);
2778 Kind : constant Node_Kind := Nkind (Par);
2781 if Nkind_In (Kind, N_Package_Body,
2785 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2789 -- In an instance, a missing stub appears at any level. A warning
2790 -- message will have been emitted already for the missing file.
2792 elsif not In_Instance then
2793 Error_Msg_N ("stub cannot appear in an inner scope", N);
2795 elsif Expander_Active then
2796 Error_Msg_N ("missing proper body", N);
2798 end Check_Stub_Level;
2800 ------------------------
2801 -- Expand_With_Clause --
2802 ------------------------
2804 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2805 Loc : constant Source_Ptr := Sloc (Nam);
2806 Ent : constant Entity_Id := Entity (Nam);
2810 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2811 -- Build name to be used in implicit with_clause. In most cases this
2812 -- is the source name, but if renamings are present we must make the
2813 -- original unit visible, not the one it renames. The entity in the
2814 -- with clause is the renamed unit, but the identifier is the one from
2815 -- the source, which allows us to recover the unit renaming.
2817 ---------------------
2818 -- Build_Unit_Name --
2819 ---------------------
2821 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2823 Renaming : Entity_Id;
2827 if Nkind (Nam) = N_Identifier then
2829 -- If the parent unit P in the name of the with_clause for P.Q is
2830 -- a renaming of package R, then the entity of the parent is set
2831 -- to R, but the identifier retains Chars (P) to be consistent
2832 -- with the source (see details in lib-load). However the implicit
2833 -- with_clause for the parent must make the entity for P visible,
2834 -- because P.Q may be used as a prefix within the current unit.
2835 -- The entity for P is the current_entity with that name, because
2836 -- the package renaming declaration for it has just been analyzed.
2837 -- Note that this case can only happen if P.Q has already appeared
2838 -- in a previous with_clause in a related unit, such as the
2839 -- library body of the current unit.
2841 if Chars (Nam) /= Chars (Entity (Nam)) then
2842 Renaming := Current_Entity (Nam);
2843 pragma Assert (Renamed_Entity (Renaming) = Entity (Nam));
2844 return New_Occurrence_Of (Renaming, Loc);
2847 return New_Occurrence_Of (Entity (Nam), Loc);
2851 Ent := Entity (Nam);
2853 if Present (Entity (Selector_Name (Nam)))
2854 and then Chars (Entity (Selector_Name (Nam))) /= Chars (Ent)
2856 Nkind (Unit_Declaration_Node (Entity (Selector_Name (Nam))))
2857 = N_Package_Renaming_Declaration
2859 -- The name in the with_clause is of the form A.B.C, and B is
2860 -- given by a renaming declaration. In that case we may not
2861 -- have analyzed the unit for B, but replaced it directly in
2862 -- lib-load with the unit it renames. We have to make A.B
2863 -- visible, so analyze the declaration for B now, in case it
2864 -- has not been done yet.
2866 Ent := Entity (Selector_Name (Nam));
2869 (Unit_Declaration_Node (Entity (Selector_Name (Nam)))));
2873 Make_Expanded_Name (Loc,
2874 Chars => Chars (Entity (Nam)),
2875 Prefix => Build_Unit_Name (Prefix (Nam)),
2876 Selector_Name => New_Occurrence_Of (Ent, Loc));
2877 Set_Entity (Result, Ent);
2880 end Build_Unit_Name;
2882 -- Start of processing for Expand_With_Clause
2885 New_Nodes_OK := New_Nodes_OK + 1;
2887 Make_With_Clause (Loc,
2888 Name => Build_Unit_Name (Nam));
2890 P := Parent (Unit_Declaration_Node (Ent));
2891 Set_Library_Unit (Withn, P);
2892 Set_Corresponding_Spec (Withn, Ent);
2893 Set_First_Name (Withn, True);
2894 Set_Implicit_With (Withn, True);
2896 -- If the unit is a package declaration, a private_with_clause on a
2897 -- child unit implies the implicit with on the parent is also private.
2899 if Nkind (Unit (N)) = N_Package_Declaration then
2900 Set_Private_Present (Withn, Private_Present (Item));
2903 Prepend (Withn, Context_Items (N));
2904 Mark_Rewrite_Insertion (Withn);
2905 Install_Withed_Unit (Withn);
2907 if Nkind (Nam) = N_Expanded_Name then
2908 Expand_With_Clause (Item, Prefix (Nam), N);
2911 New_Nodes_OK := New_Nodes_OK - 1;
2912 end Expand_With_Clause;
2914 -----------------------
2915 -- Get_Parent_Entity --
2916 -----------------------
2918 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2920 if Nkind (Unit) = N_Package_Body
2921 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2923 return Defining_Entity
2924 (Specification (Instance_Spec (Original_Node (Unit))));
2925 elsif Nkind (Unit) = N_Package_Instantiation then
2926 return Defining_Entity (Specification (Instance_Spec (Unit)));
2928 return Defining_Entity (Unit);
2930 end Get_Parent_Entity;
2932 ---------------------
2933 -- Has_With_Clause --
2934 ---------------------
2936 function Has_With_Clause
2939 Is_Limited : Boolean := False) return Boolean
2943 function Named_Unit (Clause : Node_Id) return Entity_Id;
2944 -- Return the entity for the unit named in a [limited] with clause
2950 function Named_Unit (Clause : Node_Id) return Entity_Id is
2952 if Nkind (Name (Clause)) = N_Selected_Component then
2953 return Entity (Selector_Name (Name (Clause)));
2955 return Entity (Name (Clause));
2959 -- Start of processing for Has_With_Clause
2962 if Present (Context_Items (C_Unit)) then
2963 Item := First (Context_Items (C_Unit));
2964 while Present (Item) loop
2965 if Nkind (Item) = N_With_Clause
2966 and then Limited_Present (Item) = Is_Limited
2967 and then Named_Unit (Item) = Pack
2977 end Has_With_Clause;
2979 -----------------------------
2980 -- Implicit_With_On_Parent --
2981 -----------------------------
2983 procedure Implicit_With_On_Parent
2984 (Child_Unit : Node_Id;
2987 Loc : constant Source_Ptr := Sloc (N);
2988 P : constant Node_Id := Parent_Spec (Child_Unit);
2989 P_Unit : Node_Id := Unit (P);
2990 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
2993 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
2994 -- Build prefix of child unit name. Recurse if needed
2996 function Build_Unit_Name return Node_Id;
2997 -- If the unit is a child unit, build qualified name with all ancestors
2999 -------------------------
3000 -- Build_Ancestor_Name --
3001 -------------------------
3003 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
3004 P_Ref : constant Node_Id :=
3005 New_Reference_To (Defining_Entity (P), Loc);
3006 P_Spec : Node_Id := P;
3009 -- Ancestor may have been rewritten as a package body. Retrieve
3010 -- the original spec to trace earlier ancestors.
3012 if Nkind (P) = N_Package_Body
3013 and then Nkind (Original_Node (P)) = N_Package_Instantiation
3015 P_Spec := Original_Node (P);
3018 if No (Parent_Spec (P_Spec)) then
3022 Make_Selected_Component (Loc,
3023 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
3024 Selector_Name => P_Ref);
3026 end Build_Ancestor_Name;
3028 ---------------------
3029 -- Build_Unit_Name --
3030 ---------------------
3032 function Build_Unit_Name return Node_Id is
3036 if No (Parent_Spec (P_Unit)) then
3037 return New_Reference_To (P_Name, Loc);
3041 Make_Expanded_Name (Loc,
3042 Chars => Chars (P_Name),
3043 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
3044 Selector_Name => New_Reference_To (P_Name, Loc));
3045 Set_Entity (Result, P_Name);
3048 end Build_Unit_Name;
3050 -- Start of processing for Implicit_With_On_Parent
3053 -- The unit of the current compilation may be a package body that
3054 -- replaces an instance node. In this case we need the original instance
3055 -- node to construct the proper parent name.
3057 if Nkind (P_Unit) = N_Package_Body
3058 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
3060 P_Unit := Original_Node (P_Unit);
3063 -- We add the implicit with if the child unit is the current unit being
3064 -- compiled. If the current unit is a body, we do not want to add an
3065 -- implicit_with a second time to the corresponding spec.
3067 if Nkind (Child_Unit) = N_Package_Declaration
3068 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
3073 New_Nodes_OK := New_Nodes_OK + 1;
3074 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
3076 Set_Library_Unit (Withn, P);
3077 Set_Corresponding_Spec (Withn, P_Name);
3078 Set_First_Name (Withn, True);
3079 Set_Implicit_With (Withn, True);
3081 -- Node is placed at the beginning of the context items, so that
3082 -- subsequent use clauses on the parent can be validated.
3084 Prepend (Withn, Context_Items (N));
3085 Mark_Rewrite_Insertion (Withn);
3086 Install_Withed_Unit (Withn);
3088 if Is_Child_Spec (P_Unit) then
3089 Implicit_With_On_Parent (P_Unit, N);
3092 New_Nodes_OK := New_Nodes_OK - 1;
3093 end Implicit_With_On_Parent;
3099 function In_Chain (E : Entity_Id) return Boolean is
3103 H := Current_Entity (E);
3104 while Present (H) loop
3115 ---------------------
3116 -- Install_Context --
3117 ---------------------
3119 procedure Install_Context (N : Node_Id) is
3120 Lib_Unit : constant Node_Id := Unit (N);
3123 Install_Context_Clauses (N);
3125 if Is_Child_Spec (Lib_Unit) then
3126 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
3129 Install_Limited_Context_Clauses (N);
3130 end Install_Context;
3132 -----------------------------
3133 -- Install_Context_Clauses --
3134 -----------------------------
3136 procedure Install_Context_Clauses (N : Node_Id) is
3137 Lib_Unit : constant Node_Id := Unit (N);
3139 Uname_Node : Entity_Id;
3140 Check_Private : Boolean := False;
3141 Decl_Node : Node_Id;
3142 Lib_Parent : Entity_Id;
3145 -- First skip configuration pragmas at the start of the context. They
3146 -- are not technically part of the context clause, but that's where the
3147 -- parser puts them. Note they were analyzed in Analyze_Context.
3149 Item := First (Context_Items (N));
3150 while Present (Item)
3151 and then Nkind (Item) = N_Pragma
3152 and then Pragma_Name (Item) in Configuration_Pragma_Names
3157 -- Loop through the actual context clause items. We process everything
3158 -- except Limited_With clauses in this routine. Limited_With clauses
3159 -- are separately installed (see Install_Limited_Context_Clauses).
3161 while Present (Item) loop
3163 -- Case of explicit WITH clause
3165 if Nkind (Item) = N_With_Clause
3166 and then not Implicit_With (Item)
3168 if Limited_Present (Item) then
3170 -- Limited withed units will be installed later
3174 -- If Name (Item) is not an entity name, something is wrong, and
3175 -- this will be detected in due course, for now ignore the item
3177 elsif not Is_Entity_Name (Name (Item)) then
3180 elsif No (Entity (Name (Item))) then
3181 Set_Entity (Name (Item), Any_Id);
3185 Uname_Node := Entity (Name (Item));
3187 if Is_Private_Descendant (Uname_Node) then
3188 Check_Private := True;
3191 Install_Withed_Unit (Item);
3193 Decl_Node := Unit_Declaration_Node (Uname_Node);
3195 -- If the unit is a subprogram instance, it appears nested within
3196 -- a package that carries the parent information.
3198 if Is_Generic_Instance (Uname_Node)
3199 and then Ekind (Uname_Node) /= E_Package
3201 Decl_Node := Parent (Parent (Decl_Node));
3204 if Is_Child_Spec (Decl_Node) then
3205 if Nkind (Name (Item)) = N_Expanded_Name then
3206 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3208 -- If not an expanded name, the child unit must be a
3209 -- renaming, nothing to do.
3214 elsif Nkind (Decl_Node) = N_Subprogram_Body
3215 and then not Acts_As_Spec (Parent (Decl_Node))
3216 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3218 Implicit_With_On_Parent
3219 (Unit (Library_Unit (Parent (Decl_Node))), N);
3222 -- Check license conditions unless this is a dummy unit
3224 if Sloc (Library_Unit (Item)) /= No_Location then
3225 License_Check : declare
3226 Withu : constant Unit_Number_Type :=
3227 Get_Source_Unit (Library_Unit (Item));
3228 Withl : constant License_Type :=
3229 License (Source_Index (Withu));
3230 Unitl : constant License_Type :=
3231 License (Source_Index (Current_Sem_Unit));
3233 procedure License_Error;
3234 -- Signal error of bad license
3240 procedure License_Error is
3243 ("?license of with'ed unit & may be inconsistent",
3247 -- Start of processing for License_Check
3250 -- Exclude license check if withed unit is an internal unit.
3251 -- This situation arises e.g. with the GPL version of GNAT.
3253 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3256 -- Otherwise check various cases
3268 if Withl = Restricted then
3272 when Modified_GPL =>
3273 if Withl = Restricted or else Withl = GPL then
3277 when Unrestricted =>
3284 -- Case of USE PACKAGE clause
3286 elsif Nkind (Item) = N_Use_Package_Clause then
3287 Analyze_Use_Package (Item);
3289 -- Case of USE TYPE clause
3291 elsif Nkind (Item) = N_Use_Type_Clause then
3292 Analyze_Use_Type (Item);
3296 elsif Nkind (Item) = N_Pragma then
3304 if Is_Child_Spec (Lib_Unit) then
3306 -- The unit also has implicit with_clauses on its own parents
3308 if No (Context_Items (N)) then
3309 Set_Context_Items (N, New_List);
3312 Implicit_With_On_Parent (Lib_Unit, N);
3315 -- If the unit is a body, the context of the specification must also
3316 -- be installed. That includes private with_clauses in that context.
3318 if Nkind (Lib_Unit) = N_Package_Body
3319 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3320 and then not Acts_As_Spec (N))
3322 Install_Context (Library_Unit (N));
3324 -- Only install private with-clauses of a spec that comes from
3325 -- source, excluding specs created for a subprogram body that is
3328 if Comes_From_Source (Library_Unit (N)) then
3329 Install_Private_With_Clauses
3330 (Defining_Entity (Unit (Library_Unit (N))));
3333 if Is_Child_Spec (Unit (Library_Unit (N))) then
3335 -- If the unit is the body of a public child unit, the private
3336 -- declarations of the parent must be made visible. If the child
3337 -- unit is private, the private declarations have been installed
3338 -- already in the call to Install_Parents for the spec. Installing
3339 -- private declarations must be done for all ancestors of public
3340 -- child units. In addition, sibling units mentioned in the
3341 -- context clause of the body are directly visible.
3349 Lib_Spec := Unit (Library_Unit (N));
3350 while Is_Child_Spec (Lib_Spec) loop
3351 P := Unit (Parent_Spec (Lib_Spec));
3352 P_Name := Defining_Entity (P);
3354 if not (Private_Present (Parent (Lib_Spec)))
3355 and then not In_Private_Part (P_Name)
3357 Install_Private_Declarations (P_Name);
3358 Install_Private_With_Clauses (P_Name);
3359 Set_Use (Private_Declarations (Specification (P)));
3367 -- For a package body, children in context are immediately visible
3369 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3372 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3373 N_Generic_Subprogram_Declaration,
3374 N_Package_Declaration,
3375 N_Subprogram_Declaration)
3377 if Is_Child_Spec (Lib_Unit) then
3378 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3379 Set_Is_Private_Descendant
3380 (Defining_Entity (Lib_Unit),
3381 Is_Private_Descendant (Lib_Parent)
3382 or else Private_Present (Parent (Lib_Unit)));
3385 Set_Is_Private_Descendant
3386 (Defining_Entity (Lib_Unit),
3387 Private_Present (Parent (Lib_Unit)));
3391 if Check_Private then
3392 Check_Private_Child_Unit (N);
3394 end Install_Context_Clauses;
3396 -------------------------------------
3397 -- Install_Limited_Context_Clauses --
3398 -------------------------------------
3400 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3403 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3404 -- Check that the unlimited view of a given compilation_unit is not
3405 -- already visible through "use + renamings".
3407 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3408 -- Check that if a limited_with clause of a given compilation_unit
3409 -- mentions a descendant of a private child of some library unit, then
3410 -- the given compilation_unit shall be the declaration of a private
3411 -- descendant of that library unit, or a public descendant of such. The
3412 -- code is analogous to that of Check_Private_Child_Unit but we cannot
3413 -- use entities on the limited with_clauses because their units have not
3414 -- been analyzed, so we have to climb the tree of ancestors looking for
3415 -- private keywords.
3417 procedure Expand_Limited_With_Clause
3418 (Comp_Unit : Node_Id;
3421 -- If a child unit appears in a limited_with clause, there are implicit
3422 -- limited_with clauses on all parents that are not already visible
3423 -- through a regular with clause. This procedure creates the implicit
3424 -- limited with_clauses for the parents and loads the corresponding
3425 -- units. The shadow entities are created when the inserted clause is
3426 -- analyzed. Implements Ada 2005 (AI-50217).
3428 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean;
3429 -- When compiling a unit Q descended from some parent unit P, a limited
3430 -- with_clause in the context of P that names some other ancestor of Q
3431 -- must not be installed because the ancestor is immediately visible.
3433 ---------------------
3434 -- Check_Renamings --
3435 ---------------------
3437 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3446 pragma Assert (Nkind (W) = N_With_Clause);
3448 -- Protect the frontend against previous critical errors
3450 case Nkind (Unit (Library_Unit (W))) is
3451 when N_Subprogram_Declaration |
3452 N_Package_Declaration |
3453 N_Generic_Subprogram_Declaration |
3454 N_Generic_Package_Declaration =>
3461 -- Check "use + renamings"
3463 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3464 Spec := Specification (Unit (P));
3466 Item := First (Visible_Declarations (Spec));
3467 while Present (Item) loop
3469 -- Look only at use package clauses
3471 if Nkind (Item) = N_Use_Package_Clause then
3473 -- Traverse the list of packages
3475 Nam := First (Names (Item));
3476 while Present (Nam) loop
3479 pragma Assert (Present (Parent (E)));
3481 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3482 and then Renamed_Entity (E) = WEnt
3484 -- The unlimited view is visible through use clause and
3485 -- renamings. There is no need to generate the error
3486 -- message here because Is_Visible_Through_Renamings
3487 -- takes care of generating the precise error message.
3491 elsif Nkind (Parent (E)) = N_Package_Specification then
3493 -- The use clause may refer to a local package.
3494 -- Check all the enclosing scopes.
3497 while E2 /= Standard_Standard
3505 ("unlimited view visible through use clause ", W);
3517 -- Recursive call to check all the ancestors
3519 if Is_Child_Spec (Unit (P)) then
3520 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3522 end Check_Renamings;
3524 ---------------------------------------
3525 -- Check_Private_Limited_Withed_Unit --
3526 ---------------------------------------
3528 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3529 Curr_Parent : Node_Id;
3530 Child_Parent : Node_Id;
3531 Curr_Private : Boolean;
3534 -- Compilation unit of the parent of the withed library unit
3536 Child_Parent := Library_Unit (Item);
3538 -- If the child unit is a public child, then locate its nearest
3539 -- private ancestor, if any, then Child_Parent will then be set to
3540 -- the parent of that ancestor.
3542 if not Private_Present (Library_Unit (Item)) then
3543 while Present (Child_Parent)
3544 and then not Private_Present (Child_Parent)
3546 Child_Parent := Parent_Spec (Unit (Child_Parent));
3549 if No (Child_Parent) then
3554 Child_Parent := Parent_Spec (Unit (Child_Parent));
3556 -- Traverse all the ancestors of the current compilation unit to
3557 -- check if it is a descendant of named library unit.
3559 Curr_Parent := Parent (Item);
3560 Curr_Private := Private_Present (Curr_Parent);
3562 while Present (Parent_Spec (Unit (Curr_Parent)))
3563 and then Curr_Parent /= Child_Parent
3565 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3566 Curr_Private := Curr_Private or else Private_Present (Curr_Parent);
3569 if Curr_Parent /= Child_Parent then
3571 ("unit in with clause is private child unit!", Item);
3573 ("\current unit must also have parent&!",
3574 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3576 elsif Private_Present (Parent (Item))
3577 or else Curr_Private
3578 or else Private_Present (Item)
3579 or else Nkind_In (Unit (Parent (Item)), N_Package_Body,
3583 -- Current unit is private, of descendant of a private unit
3589 ("current unit must also be private descendant of&",
3590 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3592 end Check_Private_Limited_Withed_Unit;
3594 --------------------------------
3595 -- Expand_Limited_With_Clause --
3596 --------------------------------
3598 procedure Expand_Limited_With_Clause
3599 (Comp_Unit : Node_Id;
3603 Loc : constant Source_Ptr := Sloc (Nam);
3604 Unum : Unit_Number_Type;
3607 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3608 -- Returns true if the context already includes a with_clause for
3609 -- this unit. If the with_clause is non-limited, the unit is fully
3610 -- visible and an implicit limited_with should not be created. If
3611 -- there is already a limited_with clause for W, a second one is
3612 -- simply redundant.
3614 --------------------------
3615 -- Previous_Withed_Unit --
3616 --------------------------
3618 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3622 -- A limited with_clause cannot appear in the same context_clause
3623 -- as a nonlimited with_clause which mentions the same library.
3625 Item := First (Context_Items (Comp_Unit));
3626 while Present (Item) loop
3627 if Nkind (Item) = N_With_Clause
3628 and then Library_Unit (Item) = Library_Unit (W)
3637 end Previous_Withed_Unit;
3639 -- Start of processing for Expand_Limited_With_Clause
3642 New_Nodes_OK := New_Nodes_OK + 1;
3644 if Nkind (Nam) = N_Identifier then
3646 -- Create node for name of withed unit
3649 Make_With_Clause (Loc,
3650 Name => New_Copy (Nam));
3652 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3654 Make_With_Clause (Loc,
3655 Name => Make_Selected_Component (Loc,
3656 Prefix => New_Copy_Tree (Prefix (Nam)),
3657 Selector_Name => New_Copy (Selector_Name (Nam))));
3658 Set_Parent (Withn, Parent (N));
3661 Set_Limited_Present (Withn);
3662 Set_First_Name (Withn);
3663 Set_Implicit_With (Withn);
3667 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3672 -- Do not generate a limited_with_clause on the current unit. This
3673 -- path is taken when a unit has a limited_with clause on one of its
3676 if Unum = Current_Sem_Unit then
3680 Set_Library_Unit (Withn, Cunit (Unum));
3681 Set_Corresponding_Spec
3682 (Withn, Specification (Unit (Cunit (Unum))));
3684 if not Previous_Withed_Unit (Withn) then
3685 Prepend (Withn, Context_Items (Parent (N)));
3686 Mark_Rewrite_Insertion (Withn);
3688 -- Add implicit limited_with_clauses for parents of child units
3689 -- mentioned in limited_with clauses.
3691 if Nkind (Nam) = N_Selected_Component then
3692 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3697 if not Limited_View_Installed (Withn) then
3698 Install_Limited_Withed_Unit (Withn);
3702 New_Nodes_OK := New_Nodes_OK - 1;
3703 end Expand_Limited_With_Clause;
3705 ----------------------
3706 -- Is_Ancestor_Unit --
3707 ----------------------
3709 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean is
3710 E1 : constant Entity_Id := Defining_Entity (Unit (U1));
3713 if Nkind_In (Unit (U2), N_Package_Body, N_Subprogram_Body) then
3714 E2 := Defining_Entity (Unit (Library_Unit (U2)));
3715 return Is_Ancestor_Package (E1, E2);
3719 end Is_Ancestor_Unit;
3721 -- Start of processing for Install_Limited_Context_Clauses
3724 Item := First (Context_Items (N));
3725 while Present (Item) loop
3726 if Nkind (Item) = N_With_Clause
3727 and then Limited_Present (Item)
3729 if Nkind (Name (Item)) = N_Selected_Component then
3730 Expand_Limited_With_Clause
3731 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3734 Check_Private_Limited_Withed_Unit (Item);
3736 if not Implicit_With (Item)
3737 and then Is_Child_Spec (Unit (N))
3739 Check_Renamings (Parent_Spec (Unit (N)), Item);
3742 -- A unit may have a limited with on itself if it has a limited
3743 -- with_clause on one of its child units. In that case it is
3744 -- already being compiled and it makes no sense to install its
3747 -- If the item is a limited_private_with_clause, install it if the
3748 -- current unit is a body or if it is a private child. Otherwise
3749 -- the private clause is installed before analyzing the private
3750 -- part of the current unit.
3752 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3753 and then not Limited_View_Installed (Item)
3755 not Is_Ancestor_Unit
3756 (Library_Unit (Item), Cunit (Current_Sem_Unit))
3758 if not Private_Present (Item)
3759 or else Private_Present (N)
3760 or else Nkind_In (Unit (N), N_Package_Body,
3764 Install_Limited_Withed_Unit (Item);
3772 -- Ada 2005 (AI-412): Examine visible declarations of a package spec,
3773 -- looking for incomplete subtype declarations of incomplete types
3774 -- visible through a limited with clause.
3776 if Ada_Version >= Ada_05
3777 and then Analyzed (N)
3778 and then Nkind (Unit (N)) = N_Package_Declaration
3783 Non_Lim_View : Entity_Id;
3786 Decl := First (Visible_Declarations (Specification (Unit (N))));
3787 while Present (Decl) loop
3788 if Nkind (Decl) = N_Subtype_Declaration
3790 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3792 From_With_Type (Defining_Identifier (Decl))
3794 Def_Id := Defining_Identifier (Decl);
3795 Non_Lim_View := Non_Limited_View (Def_Id);
3797 if not Is_Incomplete_Type (Non_Lim_View) then
3799 -- Convert an incomplete subtype declaration into a
3800 -- corresponding non-limited view subtype declaration.
3801 -- This is usually the case when analyzing a body that
3802 -- has regular with clauses, when the spec has limited
3805 -- If the non-limited view is still incomplete, it is
3806 -- the dummy entry already created, and the declaration
3807 -- cannot be reanalyzed. This is the case when installing
3808 -- a parent unit that has limited with-clauses.
3810 Set_Subtype_Indication (Decl,
3811 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3812 Set_Etype (Def_Id, Non_Lim_View);
3813 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3814 Set_Analyzed (Decl, False);
3816 -- Reanalyze the declaration, suppressing the call to
3817 -- Enter_Name to avoid duplicate names.
3819 Analyze_Subtype_Declaration
3829 end Install_Limited_Context_Clauses;
3831 ---------------------
3832 -- Install_Parents --
3833 ---------------------
3835 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3842 P := Unit (Parent_Spec (Lib_Unit));
3843 P_Name := Get_Parent_Entity (P);
3845 if Etype (P_Name) = Any_Type then
3849 if Ekind (P_Name) = E_Generic_Package
3850 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3851 N_Generic_Package_Declaration)
3852 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3855 ("child of a generic package must be a generic unit", Lib_Unit);
3857 elsif not Is_Package_Or_Generic_Package (P_Name) then
3859 ("parent unit must be package or generic package", Lib_Unit);
3860 raise Unrecoverable_Error;
3862 elsif Present (Renamed_Object (P_Name)) then
3863 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3864 raise Unrecoverable_Error;
3866 -- Verify that a child of an instance is itself an instance, or the
3867 -- renaming of one. Given that an instance that is a unit is replaced
3868 -- with a package declaration, check against the original node. The
3869 -- parent may be currently being instantiated, in which case it appears
3870 -- as a declaration, but the generic_parent is already established
3871 -- indicating that we deal with an instance.
3873 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3874 if Nkind (Lib_Unit) in N_Renaming_Declaration
3875 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3877 (Nkind (Lib_Unit) = N_Package_Declaration
3878 and then Present (Generic_Parent (Specification (Lib_Unit))))
3883 ("child of an instance must be an instance or renaming",
3888 -- This is the recursive call that ensures all parents are loaded
3890 if Is_Child_Spec (P) then
3892 Is_Private or else Private_Present (Parent (Lib_Unit)));
3895 -- Now we can install the context for this parent
3897 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3898 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3899 Install_Siblings (P_Name, Parent (Lib_Unit));
3901 -- The child unit is in the declarative region of the parent. The parent
3902 -- must therefore appear in the scope stack and be visible, as when
3903 -- compiling the corresponding body. If the child unit is private or it
3904 -- is a package body, private declarations must be accessible as well.
3905 -- Use declarations in the parent must also be installed. Finally, other
3906 -- child units of the same parent that are in the context are
3907 -- immediately visible.
3909 -- Find entity for compilation unit, and set its private descendant
3910 -- status as needed. Indicate that it is a compilation unit, which is
3911 -- redundant in general, but needed if this is a generated child spec
3912 -- for a child body without previous spec.
3914 E_Name := Defining_Entity (Lib_Unit);
3916 Set_Is_Child_Unit (E_Name);
3917 Set_Is_Compilation_Unit (E_Name);
3919 Set_Is_Private_Descendant (E_Name,
3920 Is_Private_Descendant (P_Name)
3921 or else Private_Present (Parent (Lib_Unit)));
3923 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3924 Push_Scope (P_Name);
3926 -- Save current visibility of unit
3928 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3929 Is_Immediately_Visible (P_Name);
3930 Set_Is_Immediately_Visible (P_Name);
3931 Install_Visible_Declarations (P_Name);
3932 Set_Use (Visible_Declarations (P_Spec));
3934 -- If the parent is a generic unit, its formal part may contain formal
3935 -- packages and use clauses for them.
3937 if Ekind (P_Name) = E_Generic_Package then
3938 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3942 or else Private_Present (Parent (Lib_Unit))
3944 Install_Private_Declarations (P_Name);
3945 Install_Private_With_Clauses (P_Name);
3946 Set_Use (Private_Declarations (P_Spec));
3948 end Install_Parents;
3950 ----------------------------------
3951 -- Install_Private_With_Clauses --
3952 ----------------------------------
3954 procedure Install_Private_With_Clauses (P : Entity_Id) is
3955 Decl : constant Node_Id := Unit_Declaration_Node (P);
3959 if Debug_Flag_I then
3960 Write_Str ("install private with clauses of ");
3961 Write_Name (Chars (P));
3965 if Nkind (Parent (Decl)) = N_Compilation_Unit then
3966 Item := First (Context_Items (Parent (Decl)));
3967 while Present (Item) loop
3968 if Nkind (Item) = N_With_Clause
3969 and then Private_Present (Item)
3971 if Limited_Present (Item) then
3972 if not Limited_View_Installed (Item) then
3973 Install_Limited_Withed_Unit (Item);
3976 Install_Withed_Unit (Item, Private_With_OK => True);
3983 end Install_Private_With_Clauses;
3985 ----------------------
3986 -- Install_Siblings --
3987 ----------------------
3989 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
3995 -- Iterate over explicit with clauses, and check whether the scope of
3996 -- each entity is an ancestor of the current unit, in which case it is
3997 -- immediately visible.
3999 Item := First (Context_Items (N));
4000 while Present (Item) loop
4002 -- Do not install private_with_clauses declaration, unless unit
4003 -- is itself a private child unit, or is a body. Note that for a
4004 -- subprogram body the private_with_clause does not take effect until
4005 -- after the specification.
4007 if Nkind (Item) /= N_With_Clause
4008 or else Implicit_With (Item)
4009 or else Limited_Present (Item)
4013 elsif not Private_Present (Item)
4014 or else Private_Present (N)
4015 or else Nkind (Unit (N)) = N_Package_Body
4017 Id := Entity (Name (Item));
4019 if Is_Child_Unit (Id)
4020 and then Is_Ancestor_Package (Scope (Id), U_Name)
4022 Set_Is_Immediately_Visible (Id);
4024 -- Check for the presence of another unit in the context that
4025 -- may be inadvertently hidden by the child.
4027 Prev := Current_Entity (Id);
4030 and then Is_Immediately_Visible (Prev)
4031 and then not Is_Child_Unit (Prev)
4037 Clause := First (Context_Items (N));
4038 while Present (Clause) loop
4039 if Nkind (Clause) = N_With_Clause
4040 and then Entity (Name (Clause)) = Prev
4043 ("child unit& hides compilation unit " &
4044 "with the same name?",
4054 -- The With_Clause may be on a grand-child or one of its further
4055 -- descendants, which makes a child immediately visible. Examine
4056 -- ancestry to determine whether such a child exists. For example,
4057 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
4058 -- is immediately visible.
4060 elsif Is_Child_Unit (Id) then
4066 while Is_Child_Unit (Par) loop
4067 if Is_Ancestor_Package (Scope (Par), U_Name) then
4068 Set_Is_Immediately_Visible (Par);
4077 -- If the item is a private with-clause on a child unit, the parent
4078 -- may have been installed already, but the child unit must remain
4079 -- invisible until installed in a private part or body, unless there
4080 -- is already a regular with_clause for it in the current unit.
4082 elsif Private_Present (Item) then
4083 Id := Entity (Name (Item));
4085 if Is_Child_Unit (Id) then
4089 function In_Context return Boolean;
4090 -- Scan context of current unit, to check whether there is
4091 -- a with_clause on the same unit as a private with-clause
4092 -- on a parent, in which case child unit is visible. If the
4093 -- unit is a grand-child, the same applies to its parent.
4099 function In_Context return Boolean is
4102 First (Context_Items (Cunit (Current_Sem_Unit)));
4103 while Present (Clause) loop
4104 if Nkind (Clause) = N_With_Clause
4105 and then Comes_From_Source (Clause)
4106 and then Is_Entity_Name (Name (Clause))
4107 and then not Private_Present (Clause)
4109 if Entity (Name (Clause)) = Id
4111 (Nkind (Name (Clause)) = N_Expanded_Name
4112 and then Entity (Prefix (Name (Clause))) = Id)
4125 Set_Is_Visible_Child_Unit (Id, In_Context);
4132 end Install_Siblings;
4134 ---------------------------------
4135 -- Install_Limited_Withed_Unit --
4136 ---------------------------------
4138 procedure Install_Limited_Withed_Unit (N : Node_Id) is
4139 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
4142 Is_Child_Package : Boolean := False;
4143 Lim_Header : Entity_Id;
4144 Lim_Typ : Entity_Id;
4146 procedure Check_Body_Required;
4147 -- A unit mentioned in a limited with_clause may not be mentioned in
4148 -- a regular with_clause, but must still be included in the current
4149 -- partition. We need to determine whether the unit needs a body, so
4150 -- that the binder can determine the name of the file to be compiled.
4151 -- Checking whether a unit needs a body can be done without semantic
4152 -- analysis, by examining the nature of the declarations in the package.
4154 function Has_Limited_With_Clause
4155 (C_Unit : Entity_Id;
4156 Pack : Entity_Id) return Boolean;
4157 -- Determine whether any package in the ancestor chain starting with
4158 -- C_Unit has a limited with clause for package Pack.
4160 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
4161 -- Check if some package installed though normal with-clauses has a
4162 -- renaming declaration of package P. AARM 10.1.2(21/2).
4164 -------------------------
4165 -- Check_Body_Required --
4166 -------------------------
4168 procedure Check_Body_Required is
4169 PA : constant List_Id :=
4170 Pragmas_After (Aux_Decls_Node (Parent (P_Unit)));
4172 procedure Check_Declarations (Spec : Node_Id);
4173 -- Recursive procedure that does the work and checks nested packages
4175 ------------------------
4176 -- Check_Declarations --
4177 ------------------------
4179 procedure Check_Declarations (Spec : Node_Id) is
4181 Incomplete_Decls : constant Elist_Id := New_Elmt_List;
4183 Subp_List : constant Elist_Id := New_Elmt_List;
4185 procedure Check_Pragma_Import (P : Node_Id);
4186 -- If a pragma import applies to a previous subprogram, the
4187 -- enclosing unit may not need a body. The processing is syntactic
4188 -- and does not require a declaration to be analyzed. The code
4189 -- below also handles pragma Import when applied to a subprogram
4190 -- that renames another. In this case the pragma applies to the
4193 -- Chains of multiple renames are not handled by the code below.
4194 -- It is probably impossible to handle all cases without proper
4195 -- name resolution. In such cases the algorithm is conservative
4196 -- and will indicate that a body is needed???
4198 -------------------------
4199 -- Check_Pragma_Import --
4200 -------------------------
4202 procedure Check_Pragma_Import (P : Node_Id) is
4208 procedure Remove_Homonyms (E : Node_Id);
4209 -- Make one pass over list of subprograms. Called again if
4210 -- subprogram is a renaming. E is known to be an identifier.
4212 ---------------------
4213 -- Remove_Homonyms --
4214 ---------------------
4216 procedure Remove_Homonyms (E : Node_Id) is
4217 R : Entity_Id := Empty;
4218 -- Name of renamed entity, if any
4221 Subp_Id := First_Elmt (Subp_List);
4222 while Present (Subp_Id) loop
4223 if Chars (Node (Subp_Id)) = Chars (E) then
4224 if Nkind (Parent (Parent (Node (Subp_Id))))
4225 /= N_Subprogram_Renaming_Declaration
4228 Next_Elmt (Subp_Id);
4229 Remove_Elmt (Subp_List, Prev_Id);
4231 R := Name (Parent (Parent (Node (Subp_Id))));
4235 Next_Elmt (Subp_Id);
4240 if Nkind (R) = N_Identifier then
4241 Remove_Homonyms (R);
4243 elsif Nkind (R) = N_Selected_Component then
4244 Remove_Homonyms (Selector_Name (R));
4246 -- Renaming of attribute
4252 end Remove_Homonyms;
4254 -- Start of processing for Check_Pragma_Import
4257 -- Find name of entity in Import pragma. We have not analyzed
4258 -- the construct, so we must guard against syntax errors.
4260 Arg := Next (First (Pragma_Argument_Associations (P)));
4263 or else Nkind (Expression (Arg)) /= N_Identifier
4267 Imported := Expression (Arg);
4270 Remove_Homonyms (Imported);
4271 end Check_Pragma_Import;
4273 -- Start of processing for Check_Declarations
4276 -- Search for Elaborate Body pragma
4278 Decl := First (Visible_Declarations (Spec));
4279 while Present (Decl)
4280 and then Nkind (Decl) = N_Pragma
4282 if Get_Pragma_Id (Decl) = Pragma_Elaborate_Body then
4283 Set_Body_Required (Library_Unit (N));
4290 -- Look for declarations that require the presence of a body. We
4291 -- have already skipped pragmas at the start of the list.
4293 while Present (Decl) loop
4295 -- Subprogram that comes from source means body may be needed.
4296 -- Save for subsequent examination of import pragmas.
4298 if Comes_From_Source (Decl)
4299 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4300 N_Subprogram_Renaming_Declaration,
4301 N_Generic_Subprogram_Declaration))
4303 Append_Elmt (Defining_Entity (Decl), Subp_List);
4305 -- Package declaration of generic package declaration. We need
4306 -- to recursively examine nested declarations.
4308 elsif Nkind_In (Decl, N_Package_Declaration,
4309 N_Generic_Package_Declaration)
4311 Check_Declarations (Specification (Decl));
4313 elsif Nkind (Decl) = N_Pragma
4314 and then Pragma_Name (Decl) = Name_Import
4316 Check_Pragma_Import (Decl);
4322 -- Same set of tests for private part. In addition to subprograms
4323 -- detect the presence of Taft Amendment types (incomplete types
4324 -- completed in the body).
4326 Decl := First (Private_Declarations (Spec));
4327 while Present (Decl) loop
4328 if Comes_From_Source (Decl)
4329 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4330 N_Subprogram_Renaming_Declaration,
4331 N_Generic_Subprogram_Declaration))
4333 Append_Elmt (Defining_Entity (Decl), Subp_List);
4335 elsif Nkind_In (Decl, N_Package_Declaration,
4336 N_Generic_Package_Declaration)
4338 Check_Declarations (Specification (Decl));
4340 -- Collect incomplete type declarations for separate pass
4342 elsif Nkind (Decl) = N_Incomplete_Type_Declaration then
4343 Append_Elmt (Decl, Incomplete_Decls);
4345 elsif Nkind (Decl) = N_Pragma
4346 and then Pragma_Name (Decl) = Name_Import
4348 Check_Pragma_Import (Decl);
4354 -- Now check incomplete declarations to locate Taft amendment
4355 -- types. This can be done by examining the defining identifiers
4356 -- of type declarations without real semantic analysis.
4362 Inc := First_Elmt (Incomplete_Decls);
4363 while Present (Inc) loop
4364 Decl := Next (Node (Inc));
4365 while Present (Decl) loop
4366 if Nkind (Decl) = N_Full_Type_Declaration
4367 and then Chars (Defining_Identifier (Decl)) =
4368 Chars (Defining_Identifier (Node (Inc)))
4376 -- If no completion, this is a TAT, and a body is needed
4379 Set_Body_Required (Library_Unit (N));
4387 -- Finally, check whether there are subprograms that still require
4388 -- a body, i.e. are not renamings or null.
4390 if not Is_Empty_Elmt_List (Subp_List) then
4396 Subp_Id := First_Elmt (Subp_List);
4397 Spec := Parent (Node (Subp_Id));
4399 while Present (Subp_Id) loop
4400 if Nkind (Parent (Spec))
4401 = N_Subprogram_Renaming_Declaration
4405 elsif Nkind (Spec) = N_Procedure_Specification
4406 and then Null_Present (Spec)
4411 Set_Body_Required (Library_Unit (N));
4415 Next_Elmt (Subp_Id);
4419 end Check_Declarations;
4421 -- Start of processing for Check_Body_Required
4424 -- If this is an imported package (Java and CIL usage) no body is
4425 -- needed. Scan list of pragmas that may follow a compilation unit
4426 -- to look for a relevant pragma Import.
4428 if Present (PA) then
4434 while Present (Prag) loop
4435 if Nkind (Prag) = N_Pragma
4436 and then Get_Pragma_Id (Prag) = Pragma_Import
4446 Check_Declarations (Specification (P_Unit));
4447 end Check_Body_Required;
4449 -----------------------------
4450 -- Has_Limited_With_Clause --
4451 -----------------------------
4453 function Has_Limited_With_Clause
4454 (C_Unit : Entity_Id;
4455 Pack : Entity_Id) return Boolean
4462 while Present (Par) loop
4463 if Ekind (Par) /= E_Package then
4467 -- Retrieve the Compilation_Unit node for Par and determine if
4468 -- its context clauses contain a limited with for Pack.
4470 Par_Unit := Parent (Parent (Parent (Par)));
4472 if Nkind (Par_Unit) = N_Package_Declaration then
4473 Par_Unit := Parent (Par_Unit);
4476 if Has_With_Clause (Par_Unit, Pack, True) then
4480 -- If there are more ancestors, climb up the tree, otherwise we
4483 if Is_Child_Unit (Par) then
4491 end Has_Limited_With_Clause;
4493 ----------------------------------
4494 -- Is_Visible_Through_Renamings --
4495 ----------------------------------
4497 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4498 Kind : constant Node_Kind :=
4499 Nkind (Unit (Cunit (Current_Sem_Unit)));
4505 -- Example of the error detected by this subprogram:
4513 -- package Ren_P renames P;
4519 -- limited with P; -- ERROR
4520 -- package R.C is ...
4522 Aux_Unit := Cunit (Current_Sem_Unit);
4525 Item := First (Context_Items (Aux_Unit));
4526 while Present (Item) loop
4527 if Nkind (Item) = N_With_Clause
4528 and then not Limited_Present (Item)
4529 and then Nkind (Unit (Library_Unit (Item))) =
4530 N_Package_Declaration
4533 First (Visible_Declarations
4534 (Specification (Unit (Library_Unit (Item)))));
4535 while Present (Decl) loop
4536 if Nkind (Decl) = N_Package_Renaming_Declaration
4537 and then Entity (Name (Decl)) = P
4539 -- Generate the error message only if the current unit
4540 -- is a package declaration; in case of subprogram
4541 -- bodies and package bodies we just return True to
4542 -- indicate that the limited view must not be
4545 if Kind = N_Package_Declaration then
4547 ("simultaneous visibility of the limited and " &
4548 "unlimited views not allowed", N);
4549 Error_Msg_Sloc := Sloc (Item);
4551 ("\\ unlimited view of & visible through the " &
4552 "context clause #", N, P);
4553 Error_Msg_Sloc := Sloc (Decl);
4554 Error_Msg_NE ("\\ and the renaming #", N, P);
4567 -- If it is a body not acting as spec, follow pointer to the
4568 -- corresponding spec, otherwise follow pointer to parent spec.
4570 if Present (Library_Unit (Aux_Unit))
4571 and then Nkind_In (Unit (Aux_Unit),
4572 N_Package_Body, N_Subprogram_Body)
4574 if Aux_Unit = Library_Unit (Aux_Unit) then
4576 -- Aux_Unit is a body that acts as a spec. Clause has
4577 -- already been flagged as illegal.
4582 Aux_Unit := Library_Unit (Aux_Unit);
4586 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4589 exit when No (Aux_Unit);
4593 end Is_Visible_Through_Renamings;
4595 -- Start of processing for Install_Limited_Withed_Unit
4598 pragma Assert (not Limited_View_Installed (N));
4600 -- In case of limited with_clause on subprograms, generics, instances,
4601 -- or renamings, the corresponding error was previously posted and we
4602 -- have nothing to do here. If the file is missing altogether, it has
4603 -- no source location.
4605 if Nkind (P_Unit) /= N_Package_Declaration
4606 or else Sloc (P_Unit) = No_Location
4611 P := Defining_Unit_Name (Specification (P_Unit));
4613 -- Handle child packages
4615 if Nkind (P) = N_Defining_Program_Unit_Name then
4616 Is_Child_Package := True;
4617 P := Defining_Identifier (P);
4620 -- Do not install the limited-view if the context of the unit is already
4621 -- available through a regular with clause.
4623 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4624 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4629 -- Do not install the limited-view if the full-view is already visible
4630 -- through renaming declarations.
4632 if Is_Visible_Through_Renamings (P) then
4636 -- Do not install the limited view if this is the unit being analyzed.
4637 -- This unusual case will happen when a unit has a limited_with clause
4638 -- on one of its children. The compilation of the child forces the load
4639 -- of the parent which tries to install the limited view of the child
4640 -- again. Installing the limited view must also be disabled when
4641 -- compiling the body of the child unit.
4643 if P = Cunit_Entity (Current_Sem_Unit)
4645 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4646 and then P = Main_Unit_Entity)
4651 -- This scenario is similar to the one above, the difference is that the
4652 -- compilation of sibling Par.Sib forces the load of parent Par which
4653 -- tries to install the limited view of Lim_Pack [1]. However Par.Sib
4654 -- has a with clause for Lim_Pack [2] in its body, and thus needs the
4655 -- non-limited views of all entities from Lim_Pack.
4657 -- limited with Lim_Pack; -- [1]
4658 -- package Par is ... package Lim_Pack is ...
4660 -- with Lim_Pack; -- [2]
4661 -- package Par.Sib is ... package body Par.Sib is ...
4663 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4664 -- Sem_Unit is the body of Par.Sib.
4666 if Ekind (P) = E_Package
4667 and then Ekind (Main_Unit_Entity) = E_Package
4668 and then Is_Child_Unit (Main_Unit_Entity)
4670 -- The body has a regular with clause
4672 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4673 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4675 -- One of the ancestors has a limited with clause
4677 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4678 N_Package_Specification
4679 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4684 -- A common use of the limited-with is to have a limited-with in the
4685 -- package spec, and a normal with in its package body. For example:
4687 -- limited with X; -- [1]
4691 -- package body A is ...
4693 -- The compilation of A's body installs the context clauses found at [2]
4694 -- and then the context clauses of its specification (found at [1]). As
4695 -- a consequence, at [1] the specification of X has been analyzed and it
4696 -- is immediately visible. According to the semantics of limited-with
4697 -- context clauses we don't install the limited view because the full
4698 -- view of X supersedes its limited view.
4700 if Analyzed (P_Unit)
4702 (Is_Immediately_Visible (P)
4703 or else (Is_Child_Package and then Is_Visible_Child_Unit (P)))
4708 if Debug_Flag_I then
4709 Write_Str ("install limited view of ");
4710 Write_Name (Chars (P));
4714 -- If the unit has not been analyzed and the limited view has not been
4715 -- already installed then we install it.
4717 if not Analyzed (P_Unit) then
4718 if not In_Chain (P) then
4720 -- Minimum decoration
4722 Set_Ekind (P, E_Package);
4723 Set_Etype (P, Standard_Void_Type);
4724 Set_Scope (P, Standard_Standard);
4726 if Is_Child_Package then
4727 Set_Is_Child_Unit (P);
4728 Set_Is_Visible_Child_Unit (P);
4729 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4732 -- Place entity on visibility structure
4734 Set_Homonym (P, Current_Entity (P));
4735 Set_Current_Entity (P);
4737 if Debug_Flag_I then
4738 Write_Str (" (homonym) chain ");
4739 Write_Name (Chars (P));
4743 -- Install the incomplete view. The first element of the limited
4744 -- view is a header (an E_Package entity) used to reference the
4745 -- first shadow entity in the private part of the package.
4747 Lim_Header := Limited_View (P);
4748 Lim_Typ := First_Entity (Lim_Header);
4750 while Present (Lim_Typ)
4751 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4753 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4754 Set_Current_Entity (Lim_Typ);
4756 if Debug_Flag_I then
4757 Write_Str (" (homonym) chain ");
4758 Write_Name (Chars (Lim_Typ));
4762 Next_Entity (Lim_Typ);
4766 -- If the unit appears in a previous regular with_clause, the regular
4767 -- entities of the public part of the withed package must be replaced
4768 -- by the shadow ones.
4770 -- This code must be kept synchronized with the code that replaces the
4771 -- shadow entities by the real entities (see body of Remove_Limited
4772 -- With_Clause); otherwise the contents of the homonym chains are not
4776 -- Hide all the type entities of the public part of the package to
4777 -- avoid its usage. This is needed to cover all the subtype decla-
4778 -- rations because we do not remove them from the homonym chain.
4780 E := First_Entity (P);
4781 while Present (E) and then E /= First_Private_Entity (P) loop
4783 Set_Was_Hidden (E, Is_Hidden (E));
4790 -- Replace the real entities by the shadow entities of the limited
4791 -- view. The first element of the limited view is a header that is
4792 -- used to reference the first shadow entity in the private part
4793 -- of the package. Successive elements are the limited views of the
4794 -- type (including regular incomplete types) declared in the package.
4796 Lim_Header := Limited_View (P);
4798 Lim_Typ := First_Entity (Lim_Header);
4799 while Present (Lim_Typ)
4800 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4802 pragma Assert (not In_Chain (Lim_Typ));
4804 -- Do not unchain nested packages and child units
4806 if Ekind (Lim_Typ) /= E_Package
4807 and then not Is_Child_Unit (Lim_Typ)
4813 Prev := Current_Entity (Lim_Typ);
4816 -- Replace E in the homonyms list, so that the limited view
4817 -- becomes available.
4819 if E = Non_Limited_View (Lim_Typ) then
4820 Set_Homonym (Lim_Typ, Homonym (Prev));
4821 Set_Current_Entity (Lim_Typ);
4825 E := Homonym (Prev);
4827 -- E may have been removed when installing a previous
4828 -- limited_with_clause.
4832 exit when E = Non_Limited_View (Lim_Typ);
4834 Prev := Homonym (Prev);
4838 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4839 Set_Homonym (Prev, Lim_Typ);
4844 if Debug_Flag_I then
4845 Write_Str (" (homonym) chain ");
4846 Write_Name (Chars (Lim_Typ));
4851 Next_Entity (Lim_Typ);
4855 -- The package must be visible while the limited-with clause is active
4856 -- because references to the type P.T must resolve in the usual way.
4857 -- In addition, we remember that the limited-view has been installed to
4858 -- uninstall it at the point of context removal.
4860 Set_Is_Immediately_Visible (P);
4861 Set_Limited_View_Installed (N);
4863 -- If unit has not been analyzed in some previous context, check
4864 -- (imperfectly ???) whether it might need a body.
4866 if not Analyzed (P_Unit) then
4867 Check_Body_Required;
4870 -- If the package in the limited_with clause is a child unit, the clause
4871 -- is unanalyzed and appears as a selected component. Recast it as an
4872 -- expanded name so that the entity can be properly set. Use entity of
4873 -- parent, if available, for higher ancestors in the name.
4875 if Nkind (Name (N)) = N_Selected_Component then
4883 while Nkind (Nam) = N_Selected_Component
4884 and then Present (Ent)
4886 Change_Selected_Component_To_Expanded_Name (Nam);
4888 -- Set entity of parent identifiers if the unit is a child
4889 -- unit. This ensures that the tree is properly formed from
4890 -- semantic point of view (e.g. for ASIS queries).
4892 Set_Entity (Nam, Ent);
4894 Nam := Prefix (Nam);
4897 -- Set entity of last ancestor
4899 if Nkind (Nam) = N_Identifier then
4900 Set_Entity (Nam, Ent);
4906 Set_Entity (Name (N), P);
4907 Set_From_With_Type (P);
4908 end Install_Limited_Withed_Unit;
4910 -------------------------
4911 -- Install_Withed_Unit --
4912 -------------------------
4914 procedure Install_Withed_Unit
4915 (With_Clause : Node_Id;
4916 Private_With_OK : Boolean := False)
4918 Uname : constant Entity_Id := Entity (Name (With_Clause));
4919 P : constant Entity_Id := Scope (Uname);
4922 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4923 -- compiling a package declaration and the Private_With_OK flag was not
4924 -- set by the caller. These declarations will be installed later (before
4925 -- analyzing the private part of the package).
4927 if Private_Present (With_Clause)
4928 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
4929 and then not (Private_With_OK)
4934 if Debug_Flag_I then
4935 if Private_Present (With_Clause) then
4936 Write_Str ("install private withed unit ");
4938 Write_Str ("install withed unit ");
4941 Write_Name (Chars (Uname));
4945 -- We do not apply the restrictions to an internal unit unless we are
4946 -- compiling the internal unit as a main unit. This check is also
4947 -- skipped for dummy units (for missing packages).
4949 if Sloc (Uname) /= No_Location
4950 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
4951 or else Current_Sem_Unit = Main_Unit)
4953 Check_Restricted_Unit
4954 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
4957 if P /= Standard_Standard then
4959 -- If the unit is not analyzed after analysis of the with clause and
4960 -- it is an instantiation then it awaits a body and is the main unit.
4961 -- Its appearance in the context of some other unit indicates a
4962 -- circular dependency (DEC suite perversity).
4964 if not Analyzed (Uname)
4965 and then Nkind (Parent (Uname)) = N_Package_Instantiation
4968 ("instantiation depends on itself", Name (With_Clause));
4970 elsif not Is_Visible_Child_Unit (Uname) then
4971 Set_Is_Visible_Child_Unit (Uname);
4973 -- If the child unit appears in the context of its parent, it is
4974 -- immediately visible.
4976 if In_Open_Scopes (Scope (Uname)) then
4977 Set_Is_Immediately_Visible (Uname);
4980 if Is_Generic_Instance (Uname)
4981 and then Ekind (Uname) in Subprogram_Kind
4983 -- Set flag as well on the visible entity that denotes the
4984 -- instance, which renames the current one.
4986 Set_Is_Visible_Child_Unit
4988 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
4991 -- The parent unit may have been installed already, and may have
4992 -- appeared in a use clause.
4994 if In_Use (Scope (Uname)) then
4995 Set_Is_Potentially_Use_Visible (Uname);
4998 Set_Context_Installed (With_Clause);
5001 elsif not Is_Immediately_Visible (Uname) then
5002 if not Private_Present (With_Clause)
5003 or else Private_With_OK
5005 Set_Is_Immediately_Visible (Uname);
5008 Set_Context_Installed (With_Clause);
5011 -- A with-clause overrides a with-type clause: there are no restric-
5012 -- tions on the use of package entities.
5014 if Ekind (Uname) = E_Package then
5015 Set_From_With_Type (Uname, False);
5018 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
5019 -- unit if there is a visible homograph for it declared in the same
5020 -- declarative region. This pathological case can only arise when an
5021 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
5022 -- G1 has a generic child also named G2, and the context includes with_
5023 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
5024 -- of I1.G2 visible as well. If the child unit is named Standard, do
5025 -- not apply the check to the Standard package itself.
5027 if Is_Child_Unit (Uname)
5028 and then Is_Visible_Child_Unit (Uname)
5029 and then Ada_Version >= Ada_05
5032 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
5038 U2 := Homonym (Uname);
5040 and then U2 /= Standard_Standard
5043 Decl2 := Unit_Declaration_Node (P2);
5045 if Is_Child_Unit (U2)
5046 and then Is_Visible_Child_Unit (U2)
5048 if Is_Generic_Instance (P)
5049 and then Nkind (Decl1) = N_Package_Declaration
5050 and then Generic_Parent (Specification (Decl1)) = P2
5052 Error_Msg_N ("illegal with_clause", With_Clause);
5054 ("\child unit has visible homograph" &
5055 " (RM 8.3(26), 10.1.1(19))",
5059 elsif Is_Generic_Instance (P2)
5060 and then Nkind (Decl2) = N_Package_Declaration
5061 and then Generic_Parent (Specification (Decl2)) = P
5063 -- With_clause for child unit of instance appears before
5064 -- in the context. We want to place the error message on
5065 -- it, not on the generic child unit itself.
5068 Prev_Clause : Node_Id;
5071 Prev_Clause := First (List_Containing (With_Clause));
5072 while Entity (Name (Prev_Clause)) /= U2 loop
5076 pragma Assert (Present (Prev_Clause));
5077 Error_Msg_N ("illegal with_clause", Prev_Clause);
5079 ("\child unit has visible homograph" &
5080 " (RM 8.3(26), 10.1.1(19))",
5091 end Install_Withed_Unit;
5097 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
5098 K : constant Node_Kind := Nkind (Lib_Unit);
5101 return (K in N_Generic_Declaration or else
5102 K in N_Generic_Instantiation or else
5103 K in N_Generic_Renaming_Declaration or else
5104 K = N_Package_Declaration or else
5105 K = N_Package_Renaming_Declaration or else
5106 K = N_Subprogram_Declaration or else
5107 K = N_Subprogram_Renaming_Declaration)
5108 and then Present (Parent_Spec (Lib_Unit));
5111 ------------------------------------
5112 -- Is_Legal_Shadow_Entity_In_Body --
5113 ------------------------------------
5115 function Is_Legal_Shadow_Entity_In_Body (T : Entity_Id) return Boolean is
5116 C_Unit : constant Node_Id := Cunit (Current_Sem_Unit);
5118 return Nkind (Unit (C_Unit)) = N_Package_Body
5121 (C_Unit, Cunit_Entity (Get_Source_Unit (Non_Limited_View (T))));
5122 end Is_Legal_Shadow_Entity_In_Body;
5124 -----------------------
5125 -- Load_Needed_Body --
5126 -----------------------
5128 -- N is a generic unit named in a with clause, or else it is a unit that
5129 -- contains a generic unit or an inlined function. In order to perform an
5130 -- instantiation, the body of the unit must be present. If the unit itself
5131 -- is generic, we assume that an instantiation follows, and load & analyze
5132 -- the body unconditionally. This forces analysis of the spec as well.
5134 -- If the unit is not generic, but contains a generic unit, it is loaded on
5135 -- demand, at the point of instantiation (see ch12).
5137 procedure Load_Needed_Body (N : Node_Id; OK : out Boolean) is
5138 Body_Name : Unit_Name_Type;
5139 Unum : Unit_Number_Type;
5141 Save_Style_Check : constant Boolean := Opt.Style_Check;
5142 -- The loading and analysis is done with style checks off
5145 if not GNAT_Mode then
5146 Style_Check := False;
5149 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
5152 (Load_Name => Body_Name,
5158 if Unum = No_Unit then
5162 Compiler_State := Analyzing; -- reset after load
5164 if not Fatal_Error (Unum) or else Try_Semantics then
5165 if Debug_Flag_L then
5166 Write_Str ("*** Loaded generic body");
5170 Semantics (Cunit (Unum));
5176 Style_Check := Save_Style_Check;
5177 end Load_Needed_Body;
5179 -------------------------
5180 -- Build_Limited_Views --
5181 -------------------------
5183 procedure Build_Limited_Views (N : Node_Id) is
5184 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
5185 P : constant Entity_Id := Cunit_Entity (Unum);
5187 Spec : Node_Id; -- To denote a package specification
5188 Lim_Typ : Entity_Id; -- To denote shadow entities
5189 Comp_Typ : Entity_Id; -- To denote real entities
5191 Lim_Header : Entity_Id; -- Package entity
5192 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
5193 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
5195 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id);
5196 -- Add attributes of an incomplete type to a shadow entity. The same
5197 -- attributes are placed on the real entity, so that gigi receives
5198 -- a consistent view.
5200 procedure Decorate_Package_Specification (P : Entity_Id);
5201 -- Add attributes of a package entity to the entity in a package
5204 procedure Decorate_Tagged_Type
5208 -- Set basic attributes of tagged type T, including its class_wide type.
5209 -- The parameters Loc, Scope are used to decorate the class_wide type.
5211 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id);
5212 -- Construct list of shadow entities and attach it to entity of
5213 -- package that is mentioned in a limited_with clause.
5215 function New_Internal_Shadow_Entity
5216 (Kind : Entity_Kind;
5217 Sloc_Value : Source_Ptr;
5218 Id_Char : Character) return Entity_Id;
5219 -- Build a new internal entity and append it to the list of shadow
5220 -- entities available through the limited-header
5226 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id) is
5227 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
5228 Is_Tagged : Boolean;
5233 while Present (Decl) loop
5235 -- For each library_package_declaration in the environment, there
5236 -- is an implicit declaration of a *limited view* of that library
5237 -- package. The limited view of a package contains:
5239 -- * For each nested package_declaration, a declaration of the
5240 -- limited view of that package, with the same defining-
5241 -- program-unit name.
5243 -- * For each type_declaration in the visible part, an incomplete
5244 -- type-declaration with the same defining_identifier, whose
5245 -- completion is the type_declaration. If the type_declaration
5246 -- is tagged, then the incomplete_type_declaration is tagged
5249 -- The partial view is tagged if the declaration has the
5250 -- explicit keyword, or else if it is a type extension, both
5251 -- of which can be ascertained syntactically.
5253 if Nkind (Decl) = N_Full_Type_Declaration then
5255 (Nkind (Type_Definition (Decl)) = N_Record_Definition
5256 and then Tagged_Present (Type_Definition (Decl)))
5258 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
5261 (Record_Extension_Part (Type_Definition (Decl))));
5263 Comp_Typ := Defining_Identifier (Decl);
5265 if not Analyzed_Unit then
5267 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5269 Decorate_Incomplete_Type (Comp_Typ, Scope);
5273 -- Create shadow entity for type
5276 New_Internal_Shadow_Entity
5277 (Kind => Ekind (Comp_Typ),
5278 Sloc_Value => Sloc (Comp_Typ),
5281 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5282 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5283 Set_From_With_Type (Lim_Typ);
5286 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5288 Decorate_Incomplete_Type (Lim_Typ, Scope);
5291 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5293 elsif Nkind_In (Decl, N_Private_Type_Declaration,
5294 N_Incomplete_Type_Declaration,
5295 N_Task_Type_Declaration,
5296 N_Protected_Type_Declaration)
5298 Comp_Typ := Defining_Identifier (Decl);
5301 Nkind_In (Decl, N_Private_Type_Declaration,
5302 N_Incomplete_Type_Declaration)
5303 and then Tagged_Present (Decl);
5305 if not Analyzed_Unit then
5307 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5309 Decorate_Incomplete_Type (Comp_Typ, Scope);
5314 New_Internal_Shadow_Entity
5315 (Kind => Ekind (Comp_Typ),
5316 Sloc_Value => Sloc (Comp_Typ),
5319 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5320 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5321 Set_From_With_Type (Lim_Typ);
5324 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5326 Decorate_Incomplete_Type (Lim_Typ, Scope);
5329 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5331 elsif Nkind (Decl) = N_Private_Extension_Declaration then
5332 Comp_Typ := Defining_Identifier (Decl);
5334 if not Analyzed_Unit then
5335 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5338 -- Create shadow entity for type
5341 New_Internal_Shadow_Entity
5342 (Kind => Ekind (Comp_Typ),
5343 Sloc_Value => Sloc (Comp_Typ),
5346 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5347 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5348 Set_From_With_Type (Lim_Typ);
5350 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5351 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5353 elsif Nkind (Decl) = N_Package_Declaration then
5358 Spec : constant Node_Id := Specification (Decl);
5361 Comp_Typ := Defining_Unit_Name (Spec);
5363 if not Analyzed (Cunit (Unum)) then
5364 Decorate_Package_Specification (Comp_Typ);
5365 Set_Scope (Comp_Typ, Scope);
5369 New_Internal_Shadow_Entity
5370 (Kind => Ekind (Comp_Typ),
5371 Sloc_Value => Sloc (Comp_Typ),
5374 Decorate_Package_Specification (Lim_Typ);
5375 Set_Scope (Lim_Typ, Scope);
5377 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5378 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5379 Set_From_With_Type (Lim_Typ);
5381 -- Note: The non_limited_view attribute is not used
5382 -- for local packages.
5386 First_Decl => First (Visible_Declarations (Spec)));
5394 ------------------------------
5395 -- Decorate_Incomplete_Type --
5396 ------------------------------
5398 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id) is
5400 Set_Ekind (E, E_Incomplete_Type);
5401 Set_Scope (E, Scop);
5403 Set_Is_First_Subtype (E, True);
5404 Set_Stored_Constraint (E, No_Elist);
5405 Set_Full_View (E, Empty);
5406 Init_Size_Align (E);
5407 end Decorate_Incomplete_Type;
5409 --------------------------
5410 -- Decorate_Tagged_Type --
5411 --------------------------
5413 procedure Decorate_Tagged_Type
5421 Decorate_Incomplete_Type (T, Scop);
5422 Set_Is_Tagged_Type (T);
5424 -- Build corresponding class_wide type, if not previously done
5426 -- Note: The class-wide entity is shared by the limited-view
5427 -- and the full-view.
5429 if No (Class_Wide_Type (T)) then
5430 CW := Make_Temporary (Loc, 'S');
5432 -- Set parent to be the same as the parent of the tagged type.
5433 -- We need a parent field set, and it is supposed to point to
5434 -- the declaration of the type. The tagged type declaration
5435 -- essentially declares two separate types, the tagged type
5436 -- itself and the corresponding class-wide type, so it is
5437 -- reasonable for the parent fields to point to the declaration
5440 Set_Parent (CW, Parent (T));
5442 -- Set remaining fields of classwide type
5444 Set_Ekind (CW, E_Class_Wide_Type);
5446 Set_Scope (CW, Scop);
5447 Set_Is_Tagged_Type (CW);
5448 Set_Is_First_Subtype (CW, True);
5449 Init_Size_Align (CW);
5450 Set_Has_Unknown_Discriminants (CW, True);
5451 Set_Class_Wide_Type (CW, CW);
5452 Set_Equivalent_Type (CW, Empty);
5453 Set_From_With_Type (CW, From_With_Type (T));
5455 -- Link type to its class-wide type
5457 Set_Class_Wide_Type (T, CW);
5459 end Decorate_Tagged_Type;
5461 ------------------------------------
5462 -- Decorate_Package_Specification --
5463 ------------------------------------
5465 procedure Decorate_Package_Specification (P : Entity_Id) is
5467 -- Place only the most basic attributes
5469 Set_Ekind (P, E_Package);
5470 Set_Etype (P, Standard_Void_Type);
5471 end Decorate_Package_Specification;
5473 --------------------------------
5474 -- New_Internal_Shadow_Entity --
5475 --------------------------------
5477 function New_Internal_Shadow_Entity
5478 (Kind : Entity_Kind;
5479 Sloc_Value : Source_Ptr;
5480 Id_Char : Character) return Entity_Id
5482 E : constant Entity_Id := Make_Temporary (Sloc_Value, Id_Char);
5485 Set_Ekind (E, Kind);
5486 Set_Is_Internal (E, True);
5488 if Kind in Type_Kind then
5489 Init_Size_Align (E);
5492 Append_Entity (E, Lim_Header);
5495 end New_Internal_Shadow_Entity;
5497 -- Start of processing for Build_Limited_Views
5500 pragma Assert (Limited_Present (N));
5502 -- A library_item mentioned in a limited_with_clause is a package
5503 -- declaration, not a subprogram declaration, generic declaration,
5504 -- generic instantiation, or package renaming declaration.
5506 case Nkind (Unit (Library_Unit (N))) is
5507 when N_Package_Declaration =>
5510 when N_Subprogram_Declaration =>
5511 Error_Msg_N ("subprograms not allowed in "
5512 & "limited with_clauses", N);
5515 when N_Generic_Package_Declaration |
5516 N_Generic_Subprogram_Declaration =>
5517 Error_Msg_N ("generics not allowed in "
5518 & "limited with_clauses", N);
5521 when N_Generic_Instantiation =>
5522 Error_Msg_N ("generic instantiations not allowed in "
5523 & "limited with_clauses", N);
5526 when N_Generic_Renaming_Declaration =>
5527 Error_Msg_N ("generic renamings not allowed in "
5528 & "limited with_clauses", N);
5531 when N_Subprogram_Renaming_Declaration =>
5532 Error_Msg_N ("renamed subprograms not allowed in "
5533 & "limited with_clauses", N);
5536 when N_Package_Renaming_Declaration =>
5537 Error_Msg_N ("renamed packages not allowed in "
5538 & "limited with_clauses", N);
5542 raise Program_Error;
5545 -- Check if the chain is already built
5547 Spec := Specification (Unit (Library_Unit (N)));
5549 if Limited_View_Installed (Spec) then
5553 Set_Ekind (P, E_Package);
5555 -- Build the header of the limited_view
5557 Lim_Header := Make_Temporary (Sloc (N), 'Z');
5558 Set_Ekind (Lim_Header, E_Package);
5559 Set_Is_Internal (Lim_Header);
5560 Set_Limited_View (P, Lim_Header);
5562 -- Create the auxiliary chain. All the shadow entities are appended to
5563 -- the list of entities of the limited-view header
5567 First_Decl => First (Visible_Declarations (Spec)));
5569 -- Save the last built shadow entity. It is needed later to set the
5570 -- reference to the first shadow entity in the private part
5572 Last_Pub_Lim_E := Last_Lim_E;
5574 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5575 -- Required to give support to limited-private-with clauses
5577 Build_Chain (Scope => P,
5578 First_Decl => First (Private_Declarations (Spec)));
5580 if Last_Pub_Lim_E /= Empty then
5581 Set_First_Private_Entity
5582 (Lim_Header, Next_Entity (Last_Pub_Lim_E));
5584 Set_First_Private_Entity
5585 (Lim_Header, First_Entity (P));
5588 Set_Limited_View_Installed (Spec);
5589 end Build_Limited_Views;
5591 -------------------------------
5592 -- Check_Body_Needed_For_SAL --
5593 -------------------------------
5595 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5597 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5598 -- Determine whether use of entity E might require the presence of its
5599 -- body. For a package this requires a recursive traversal of all nested
5602 ---------------------------
5603 -- Entity_Needed_For_SAL --
5604 ---------------------------
5606 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5610 if Is_Subprogram (E)
5611 and then Has_Pragma_Inline (E)
5615 elsif Ekind_In (E, E_Generic_Function, E_Generic_Procedure) then
5618 elsif Ekind (E) = E_Generic_Package
5620 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5621 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5625 elsif Ekind (E) = E_Package
5626 and then Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5627 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5629 Ent := First_Entity (E);
5630 while Present (Ent) loop
5631 if Entity_Needs_Body (Ent) then
5643 end Entity_Needs_Body;
5645 -- Start of processing for Check_Body_Needed_For_SAL
5648 if Ekind (Unit_Name) = E_Generic_Package
5649 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5650 N_Generic_Package_Declaration
5652 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5654 Set_Body_Needed_For_SAL (Unit_Name);
5656 elsif Ekind_In (Unit_Name, E_Generic_Procedure, E_Generic_Function) then
5657 Set_Body_Needed_For_SAL (Unit_Name);
5659 elsif Is_Subprogram (Unit_Name)
5660 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5661 N_Subprogram_Declaration
5662 and then Has_Pragma_Inline (Unit_Name)
5664 Set_Body_Needed_For_SAL (Unit_Name);
5666 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5667 Check_Body_Needed_For_SAL
5668 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5670 elsif Ekind (Unit_Name) = E_Package
5671 and then Entity_Needs_Body (Unit_Name)
5673 Set_Body_Needed_For_SAL (Unit_Name);
5675 elsif Ekind (Unit_Name) = E_Package_Body
5676 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5678 Check_Body_Needed_For_SAL
5679 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5681 end Check_Body_Needed_For_SAL;
5683 --------------------
5684 -- Remove_Context --
5685 --------------------
5687 procedure Remove_Context (N : Node_Id) is
5688 Lib_Unit : constant Node_Id := Unit (N);
5691 -- If this is a child unit, first remove the parent units
5693 if Is_Child_Spec (Lib_Unit) then
5694 Remove_Parents (Lib_Unit);
5697 Remove_Context_Clauses (N);
5700 ----------------------------
5701 -- Remove_Context_Clauses --
5702 ----------------------------
5704 procedure Remove_Context_Clauses (N : Node_Id) is
5706 Unit_Name : Entity_Id;
5709 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5710 -- limited-views first and regular-views later (to maintain the
5713 -- First Phase: Remove limited_with context clauses
5715 Item := First (Context_Items (N));
5716 while Present (Item) loop
5718 -- We are interested only in with clauses which got installed
5721 if Nkind (Item) = N_With_Clause
5722 and then Limited_Present (Item)
5723 and then Limited_View_Installed (Item)
5725 Remove_Limited_With_Clause (Item);
5731 -- Second Phase: Loop through context items and undo regular
5732 -- with_clauses and use_clauses.
5734 Item := First (Context_Items (N));
5735 while Present (Item) loop
5737 -- We are interested only in with clauses which got installed on
5738 -- entry, as indicated by their Context_Installed flag set
5740 if Nkind (Item) = N_With_Clause
5741 and then Limited_Present (Item)
5742 and then Limited_View_Installed (Item)
5746 elsif Nkind (Item) = N_With_Clause
5747 and then Context_Installed (Item)
5749 -- Remove items from one with'ed unit
5751 Unit_Name := Entity (Name (Item));
5752 Remove_Unit_From_Visibility (Unit_Name);
5753 Set_Context_Installed (Item, False);
5755 elsif Nkind (Item) = N_Use_Package_Clause then
5756 End_Use_Package (Item);
5758 elsif Nkind (Item) = N_Use_Type_Clause then
5759 End_Use_Type (Item);
5764 end Remove_Context_Clauses;
5766 --------------------------------
5767 -- Remove_Limited_With_Clause --
5768 --------------------------------
5770 procedure Remove_Limited_With_Clause (N : Node_Id) is
5771 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5774 Lim_Header : Entity_Id;
5775 Lim_Typ : Entity_Id;
5779 pragma Assert (Limited_View_Installed (N));
5781 -- In case of limited with_clause on subprograms, generics, instances,
5782 -- or renamings, the corresponding error was previously posted and we
5783 -- have nothing to do here.
5785 if Nkind (P_Unit) /= N_Package_Declaration then
5789 P := Defining_Unit_Name (Specification (P_Unit));
5791 -- Handle child packages
5793 if Nkind (P) = N_Defining_Program_Unit_Name then
5794 P := Defining_Identifier (P);
5797 if Debug_Flag_I then
5798 Write_Str ("remove limited view of ");
5799 Write_Name (Chars (P));
5800 Write_Str (" from visibility");
5804 -- Prepare the removal of the shadow entities from visibility. The first
5805 -- element of the limited view is a header (an E_Package entity) that is
5806 -- used to reference the first shadow entity in the private part of the
5809 Lim_Header := Limited_View (P);
5810 Lim_Typ := First_Entity (Lim_Header);
5812 -- Remove package and shadow entities from visibility if it has not
5815 if not Analyzed (P_Unit) then
5817 Set_Is_Immediately_Visible (P, False);
5819 while Present (Lim_Typ) loop
5821 Next_Entity (Lim_Typ);
5824 -- Otherwise this package has already appeared in the closure and its
5825 -- shadow entities must be replaced by its real entities. This code
5826 -- must be kept synchronized with the complementary code in Install
5827 -- Limited_Withed_Unit.
5830 -- Real entities that are type or subtype declarations were hidden
5831 -- from visibility at the point of installation of the limited-view.
5832 -- Now we recover the previous value of the hidden attribute.
5834 E := First_Entity (P);
5835 while Present (E) and then E /= First_Private_Entity (P) loop
5837 Set_Is_Hidden (E, Was_Hidden (E));
5843 while Present (Lim_Typ)
5844 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5846 -- Nested packages and child units were not unchained
5848 if Ekind (Lim_Typ) /= E_Package
5849 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5851 -- If the package has incomplete types, the limited view of the
5852 -- incomplete type is in fact never visible (AI05-129) but we
5853 -- have created a shadow entity E1 for it, that points to E2,
5854 -- a non-limited incomplete type. This in turn has a full view
5855 -- E3 that is the full declaration. There is a corresponding
5856 -- shadow entity E4. When reinstalling the non-limited view,
5857 -- E2 must become the current entity and E3 must be ignored.
5859 E := Non_Limited_View (Lim_Typ);
5861 if Present (Current_Entity (E))
5862 and then Ekind (Current_Entity (E)) = E_Incomplete_Type
5863 and then Full_View (Current_Entity (E)) = E
5866 -- Lim_Typ is the limited view of a full type declaration
5867 -- that has a previous incomplete declaration, i.e. E3 from
5868 -- the previous description. Nothing to insert.
5873 pragma Assert (not In_Chain (E));
5875 Prev := Current_Entity (Lim_Typ);
5877 if Prev = Lim_Typ then
5878 Set_Current_Entity (E);
5881 while Present (Prev)
5882 and then Homonym (Prev) /= Lim_Typ
5884 Prev := Homonym (Prev);
5887 if Present (Prev) then
5888 Set_Homonym (Prev, E);
5892 -- Preserve structure of homonym chain
5894 Set_Homonym (E, Homonym (Lim_Typ));
5898 Next_Entity (Lim_Typ);
5902 -- Indicate that the limited view of the package is not installed
5904 Set_From_With_Type (P, False);
5905 Set_Limited_View_Installed (N, False);
5906 end Remove_Limited_With_Clause;
5908 --------------------
5909 -- Remove_Parents --
5910 --------------------
5912 procedure Remove_Parents (Lib_Unit : Node_Id) is
5915 P_Spec : Node_Id := Empty;
5917 Vis : constant Boolean :=
5918 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
5921 if Is_Child_Spec (Lib_Unit) then
5922 P_Spec := Parent_Spec (Lib_Unit);
5924 elsif Nkind (Lib_Unit) = N_Package_Body
5925 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
5927 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
5930 if Present (P_Spec) then
5932 P_Name := Get_Parent_Entity (P);
5933 Remove_Context_Clauses (P_Spec);
5934 End_Package_Scope (P_Name);
5935 Set_Is_Immediately_Visible (P_Name, Vis);
5937 -- Remove from visibility the siblings as well, which are directly
5938 -- visible while the parent is in scope.
5940 E := First_Entity (P_Name);
5941 while Present (E) loop
5942 if Is_Child_Unit (E) then
5943 Set_Is_Immediately_Visible (E, False);
5949 Set_In_Package_Body (P_Name, False);
5951 -- This is the recursive call to remove the context of any higher
5952 -- level parent. This recursion ensures that all parents are removed
5953 -- in the reverse order of their installation.
5959 ---------------------------------
5960 -- Remove_Private_With_Clauses --
5961 ---------------------------------
5963 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
5966 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
5967 -- Check whether a given unit appears in a regular with_clause. Used to
5968 -- determine whether a private_with_clause, implicit or explicit, should
5971 ----------------------------
5972 -- In_Regular_With_Clause --
5973 ----------------------------
5975 function In_Regular_With_Clause (E : Entity_Id) return Boolean
5980 Item := First (Context_Items (Comp_Unit));
5981 while Present (Item) loop
5982 if Nkind (Item) = N_With_Clause
5983 and then Entity (Name (Item)) = E
5984 and then not Private_Present (Item)
5992 end In_Regular_With_Clause;
5994 -- Start of processing for Remove_Private_With_Clauses
5997 Item := First (Context_Items (Comp_Unit));
5998 while Present (Item) loop
5999 if Nkind (Item) = N_With_Clause
6000 and then Private_Present (Item)
6002 -- If private_with_clause is redundant, remove it from context,
6003 -- as a small optimization to subsequent handling of private_with
6004 -- clauses in other nested packages.
6006 if In_Regular_With_Clause (Entity (Name (Item))) then
6008 Nxt : constant Node_Id := Next (Item);
6014 elsif Limited_Present (Item) then
6015 if not Limited_View_Installed (Item) then
6016 Remove_Limited_With_Clause (Item);
6022 Remove_Unit_From_Visibility (Entity (Name (Item)));
6023 Set_Context_Installed (Item, False);
6031 end Remove_Private_With_Clauses;
6033 ---------------------------------
6034 -- Remove_Unit_From_Visibility --
6035 ---------------------------------
6037 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
6038 P : constant Entity_Id := Scope (Unit_Name);
6041 if Debug_Flag_I then
6042 Write_Str ("remove unit ");
6043 Write_Name (Chars (Unit_Name));
6044 Write_Str (" from visibility");
6048 if P /= Standard_Standard then
6049 Set_Is_Visible_Child_Unit (Unit_Name, False);
6052 Set_Is_Potentially_Use_Visible (Unit_Name, False);
6053 Set_Is_Immediately_Visible (Unit_Name, False);
6054 end Remove_Unit_From_Visibility;
6069 procedure Unchain (E : Entity_Id) is
6073 Prev := Current_Entity (E);
6079 Set_Name_Entity_Id (Chars (E), Homonym (E));
6082 while Present (Prev)
6083 and then Homonym (Prev) /= E
6085 Prev := Homonym (Prev);
6088 if Present (Prev) then
6089 Set_Homonym (Prev, Homonym (E));
6093 if Debug_Flag_I then
6094 Write_Str (" (homonym) unchain ");
6095 Write_Name (Chars (E));
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