1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, 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 Restrict; use Restrict;
46 with Rident; use Rident;
47 with Rtsfind; use Rtsfind;
49 with Sem_Ch3; use Sem_Ch3;
50 with Sem_Ch6; use Sem_Ch6;
51 with Sem_Ch7; use Sem_Ch7;
52 with Sem_Ch8; use Sem_Ch8;
53 with Sem_Dist; use Sem_Dist;
54 with Sem_Prag; use Sem_Prag;
55 with Sem_Util; use Sem_Util;
56 with Sem_Warn; use Sem_Warn;
57 with Stand; use Stand;
58 with Sinfo; use Sinfo;
59 with Sinfo.CN; use Sinfo.CN;
60 with Sinput; use Sinput;
61 with Snames; use Snames;
62 with Style; use Style;
63 with Stylesw; use Stylesw;
64 with Tbuild; use Tbuild;
65 with Uname; use Uname;
67 package body Sem_Ch10 is
69 -----------------------
70 -- Local Subprograms --
71 -----------------------
73 procedure Analyze_Context (N : Node_Id);
74 -- Analyzes items in the context clause of compilation unit
76 procedure Build_Limited_Views (N : Node_Id);
77 -- Build and decorate the list of shadow entities for a package mentioned
78 -- in a limited_with clause. If the package was not previously analyzed
79 -- then it also performs a basic decoration of the real entities; this
80 -- is required to do not pass non-decorated entities to the back-end.
81 -- Implements Ada 2005 (AI-50217).
83 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id);
84 -- Check whether the source for the body of a compilation unit must
85 -- be included in a standalone library.
87 procedure Check_Private_Child_Unit (N : Node_Id);
88 -- If a with_clause mentions a private child unit, the compilation
89 -- unit must be a member of the same family, as described in 10.1.2.
91 procedure Check_Stub_Level (N : Node_Id);
92 -- Verify that a stub is declared immediately within a compilation unit,
93 -- and not in an inner frame.
95 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id);
96 -- When a child unit appears in a context clause, the implicit withs on
97 -- parents are made explicit, and with clauses are inserted in the context
98 -- clause before the one for the child. If a parent in the with_clause
99 -- is a renaming, the implicit with_clause is on the renaming whose name
100 -- is mentioned in the with_clause, and not on the package it renames.
101 -- N is the compilation unit whose list of context items receives the
102 -- implicit with_clauses.
104 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
105 -- Get defining entity of parent unit of a child unit. In most cases this
106 -- is the defining entity of the unit, but for a child instance whose
107 -- parent needs a body for inlining, the instantiation node of the parent
108 -- has not yet been rewritten as a package declaration, and the entity has
109 -- to be retrieved from the Instance_Spec of the unit.
111 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id);
112 -- If the main unit is a child unit, implicit withs are also added for
113 -- all its ancestors.
115 function In_Chain (E : Entity_Id) return Boolean;
116 -- Check that the shadow entity is not already in the homonym chain, for
117 -- example through a limited_with clause in a parent unit.
119 procedure Install_Context_Clauses (N : Node_Id);
120 -- Subsidiary to Install_Context and Install_Parents. Process only with_
121 -- and use_clauses for current unit and its library unit if any.
123 procedure Install_Limited_Context_Clauses (N : Node_Id);
124 -- Subsidiary to Install_Context. Process only limited with_clauses
125 -- for current unit. Implements Ada 2005 (AI-50217).
127 procedure Install_Limited_Withed_Unit (N : Node_Id);
128 -- Place shadow entities for a limited_with package in the visibility
129 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
131 procedure Install_Withed_Unit
132 (With_Clause : Node_Id;
133 Private_With_OK : Boolean := False);
134 -- If the unit is not a child unit, make unit immediately visible.
135 -- The caller ensures that the unit is not already currently installed.
136 -- The flag Private_With_OK is set true in Install_Private_With_Clauses,
137 -- which is called when compiling the private part of a package, or
138 -- installing the private declarations of a parent unit.
140 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean);
141 -- This procedure establishes the context for the compilation of a child
142 -- unit. If Lib_Unit is a child library spec then the context of the parent
143 -- is installed, and the parent itself made immediately visible, so that
144 -- the child unit is processed in the declarative region of the parent.
145 -- Install_Parents makes a recursive call to itself to ensure that all
146 -- parents are loaded in the nested case. If Lib_Unit is a library body,
147 -- the only effect of Install_Parents is to install the private decls of
148 -- the parents, because the visible parent declarations will have been
149 -- installed as part of the context of the corresponding spec.
151 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id);
152 -- In the compilation of a child unit, a child of any of the ancestor
153 -- units is directly visible if it is visible, because the parent is in
154 -- an enclosing scope. Iterate over context to find child units of U_Name
155 -- or of some ancestor of it.
157 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean;
158 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
159 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
160 -- a library spec that has a parent. If the call to Is_Child_Spec returns
161 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
162 -- compilation unit for the parent spec.
164 -- Lib_Unit can also be a subprogram body that acts as its own spec. If
165 -- the Parent_Spec is non-empty, this is also a child unit.
167 procedure Remove_Context_Clauses (N : Node_Id);
168 -- Subsidiary of previous one. Remove use_ and with_clauses
170 procedure Remove_Limited_With_Clause (N : Node_Id);
171 -- Remove from visibility the shadow entities introduced for a package
172 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
174 procedure Remove_Parents (Lib_Unit : Node_Id);
175 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
176 -- contexts established by the corresponding call to Install_Parents are
177 -- removed. Remove_Parents contains a recursive call to itself to ensure
178 -- that all parents are removed in the nested case.
180 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
181 -- Reset all visibility flags on unit after compiling it, either as a
182 -- main unit or as a unit in the context.
184 procedure Unchain (E : Entity_Id);
185 -- Remove single entity from visibility list
187 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
188 -- Common processing for all stubs (subprograms, tasks, packages, and
189 -- protected cases). N is the stub to be analyzed. Once the subunit
190 -- name is established, load and analyze. Nam is the non-overloadable
191 -- entity for which the proper body provides a completion. Subprogram
192 -- stubs are handled differently because they can be declarations.
195 -- A dummy procedure, for debugging use, called just before analyzing the
196 -- main unit (after dealing with any context clauses).
198 --------------------------
199 -- Limited_With_Clauses --
200 --------------------------
202 -- Limited_With clauses are the mechanism chosen for Ada05 to support
203 -- mutually recursive types declared in different units. A limited_with
204 -- clause that names package P in the context of unit U makes the types
205 -- declared in the visible part of P available within U, but with the
206 -- restriction that these types can only be used as incomplete types.
207 -- The limited_with clause does not impose a semantic dependence on P,
208 -- and it is possible for two packages to have limited_with_clauses on
209 -- each other without creating an elaboration circularity.
211 -- To support this feature, the analysis of a limited_with clause must
212 -- create an abbreviated view of the package, without performing any
213 -- semantic analysis on it. This "package abstract" contains shadow
214 -- types that are in one-one correspondence with the real types in the
215 -- package, and that have the properties of incomplete types.
217 -- The implementation creates two element lists: one to chain the shadow
218 -- entities, and one to chain the corresponding type entities in the tree
219 -- of the package. Links between corresponding entities in both chains
220 -- allow the compiler to select the proper view of a given type, depending
221 -- on the context. Note that in contrast with the handling of private
222 -- types, the limited view and the non-limited view of a type are treated
223 -- as separate entities, and no entity exchange needs to take place, which
224 -- makes the implementation must simpler than could be feared.
226 ------------------------------
227 -- Analyze_Compilation_Unit --
228 ------------------------------
230 procedure Analyze_Compilation_Unit (N : Node_Id) is
231 Unit_Node : constant Node_Id := Unit (N);
232 Lib_Unit : Node_Id := Library_Unit (N);
234 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
235 Par_Spec_Name : Unit_Name_Type;
236 Unum : Unit_Number_Type;
238 procedure Check_Redundant_Withs
239 (Context_Items : List_Id;
240 Spec_Context_Items : List_Id := No_List);
241 -- Determine whether the context list of a compilation unit contains
242 -- redundant with clauses. When checking body clauses against spec
243 -- clauses, set Context_Items to the context list of the body and
244 -- Spec_Context_Items to that of the spec. Parent packages are not
245 -- examined for documentation purposes.
247 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
248 -- Generate cross-reference information for the parents of child units.
249 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
251 ---------------------------
252 -- Check_Redundant_Withs --
253 ---------------------------
255 procedure Check_Redundant_Withs
256 (Context_Items : List_Id;
257 Spec_Context_Items : List_Id := No_List)
261 procedure Process_Body_Clauses
262 (Context_List : List_Id;
264 Used : in out Boolean;
265 Used_Type_Or_Elab : in out Boolean);
266 -- Examine the context clauses of a package body, trying to match
267 -- the name entity of Clause with any list element. If the match
268 -- occurs on a use package clause, set Used to True, for a use
269 -- type clause, pragma Elaborate or pragma Elaborate_All, set
270 -- Used_Type_Or_Elab to True.
272 procedure Process_Spec_Clauses
273 (Context_List : List_Id;
275 Used : in out Boolean;
276 Withed : in out Boolean;
277 Exit_On_Self : Boolean := False);
278 -- Examine the context clauses of a package spec, trying to match
279 -- the name entity of Clause with any list element. If the match
280 -- occurs on a use package clause, set Used to True, for a with
281 -- package clause other than Clause, set Withed to True. Limited
282 -- with clauses, implicitly generated with clauses and withs
283 -- having pragmas Elaborate or Elaborate_All applied to them are
284 -- skipped. Exit_On_Self is used to control the search loop and
285 -- force an exit whenever Clause sees itself in the search.
287 --------------------------
288 -- Process_Body_Clauses --
289 --------------------------
291 procedure Process_Body_Clauses
292 (Context_List : List_Id;
294 Used : in out Boolean;
295 Used_Type_Or_Elab : in out Boolean)
297 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
303 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean;
304 -- In an expanded name in a use clause, if the prefix is a
305 -- renamed package, the entity is set to the original package
306 -- as a result, when checking whether the package appears in a
307 -- previous with_clause, the renaming has to be taken into
308 -- account, to prevent spurious or incorrect warnings. The
309 -- common case is the use of Text_IO.
315 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean is
317 return Entity (N) = P
319 (Present (Renamed_Object (P))
320 and then Entity (N) = Renamed_Object (P));
323 -- Start of processing for Process_Body_Clauses
327 Used_Type_Or_Elab := False;
329 Cont_Item := First (Context_List);
330 while Present (Cont_Item) loop
332 -- Package use clause
334 if Nkind (Cont_Item) = N_Use_Package_Clause
337 -- Search through use clauses
339 Use_Item := First (Names (Cont_Item));
340 while Present (Use_Item) and then not Used loop
342 -- Case of a direct use of the one we are looking for
344 if Entity (Use_Item) = Nam_Ent then
347 -- Handle nested case, as in "with P; use P.Q.R"
354 -- Loop through prefixes looking for match
357 while Nkind (UE) = N_Expanded_Name loop
358 if Same_Unit (Prefix (UE), Nam_Ent) then
373 elsif Nkind (Cont_Item) = N_Use_Type_Clause
374 and then not Used_Type_Or_Elab
376 Subt_Mark := First (Subtype_Marks (Cont_Item));
377 while Present (Subt_Mark)
378 and then not Used_Type_Or_Elab
380 if Same_Unit (Prefix (Subt_Mark), Nam_Ent) then
381 Used_Type_Or_Elab := True;
387 -- Pragma Elaborate or Elaborate_All
389 elsif Nkind (Cont_Item) = N_Pragma
391 (Pragma_Name (Cont_Item) = Name_Elaborate
393 Pragma_Name (Cont_Item) = Name_Elaborate_All)
394 and then not Used_Type_Or_Elab
397 First (Pragma_Argument_Associations (Cont_Item));
398 while Present (Prag_Unit)
399 and then not Used_Type_Or_Elab
401 if Entity (Expression (Prag_Unit)) = Nam_Ent then
402 Used_Type_Or_Elab := True;
411 end Process_Body_Clauses;
413 --------------------------
414 -- Process_Spec_Clauses --
415 --------------------------
417 procedure Process_Spec_Clauses
418 (Context_List : List_Id;
420 Used : in out Boolean;
421 Withed : in out Boolean;
422 Exit_On_Self : Boolean := False)
424 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
432 Cont_Item := First (Context_List);
433 while Present (Cont_Item) loop
435 -- Stop the search since the context items after Cont_Item
436 -- have already been examined in a previous iteration of
437 -- the reverse loop in Check_Redundant_Withs.
440 and Cont_Item = Clause
445 -- Package use clause
447 if Nkind (Cont_Item) = N_Use_Package_Clause
450 Use_Item := First (Names (Cont_Item));
451 while Present (Use_Item) and then not Used loop
452 if Entity (Use_Item) = Nam_Ent then
459 -- Package with clause. Avoid processing self, implicitly
460 -- generated with clauses or limited with clauses. Note
461 -- that we examine with clauses having pragmas Elaborate
462 -- or Elaborate_All applied to them due to cases such as:
466 -- pragma Elaborate (Pack);
468 -- In this case, the second with clause is redundant since
469 -- the pragma applies only to the first "with Pack;".
471 elsif Nkind (Cont_Item) = N_With_Clause
472 and then not Implicit_With (Cont_Item)
473 and then not Limited_Present (Cont_Item)
474 and then Cont_Item /= Clause
475 and then Entity (Name (Cont_Item)) = Nam_Ent
482 end Process_Spec_Clauses;
484 -- Start of processing for Check_Redundant_Withs
487 Clause := Last (Context_Items);
488 while Present (Clause) loop
490 -- Avoid checking implicitly generated with clauses, limited
491 -- with clauses or withs that have pragma Elaborate or
492 -- Elaborate_All applied.
494 if Nkind (Clause) = N_With_Clause
495 and then not Implicit_With (Clause)
496 and then not Limited_Present (Clause)
497 and then not Elaborate_Present (Clause)
499 -- Package body-to-spec check
501 if Present (Spec_Context_Items) then
503 Used_In_Body : Boolean := False;
504 Used_In_Spec : Boolean := False;
505 Used_Type_Or_Elab : Boolean := False;
506 Withed_In_Spec : Boolean := False;
510 (Context_List => Spec_Context_Items,
512 Used => Used_In_Spec,
513 Withed => Withed_In_Spec);
516 (Context_List => Context_Items,
518 Used => Used_In_Body,
519 Used_Type_Or_Elab => Used_Type_Or_Elab);
521 -- "Type Elab" refers to the presence of either a use
522 -- type clause, pragmas Elaborate or Elaborate_All.
524 -- +---------------+---------------------------+------+
525 -- | Spec | Body | Warn |
526 -- +--------+------+--------+------+-----------+------+
527 -- | Withed | Used | Withed | Used | Type Elab | |
528 -- | X | | X | | | X |
529 -- | X | | X | X | | |
530 -- | X | | X | | X | |
531 -- | X | | X | X | X | |
532 -- | X | X | X | | | X |
533 -- | X | X | X | | X | |
534 -- | X | X | X | X | | X |
535 -- | X | X | X | X | X | |
536 -- +--------+------+--------+------+-----------+------+
539 and then not Used_Type_Or_Elab)
542 and then not Used_In_Body)
546 Error_Msg_N ("?redundant with clause in body", Clause);
549 Used_In_Body := False;
550 Used_In_Spec := False;
551 Used_Type_Or_Elab := False;
552 Withed_In_Spec := False;
555 -- Standalone package spec or body check
559 Dont_Care : Boolean := False;
560 Withed : Boolean := False;
563 -- The mechanism for examining the context clauses of a
564 -- package spec can be applied to package body clauses.
567 (Context_List => Context_Items,
571 Exit_On_Self => True);
574 Error_Msg_N ("?redundant with clause", Clause);
582 end Check_Redundant_Withs;
584 --------------------------------
585 -- Generate_Parent_References --
586 --------------------------------
588 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is
590 P_Name : Entity_Id := P_Id;
593 Pref := Name (Parent (Defining_Entity (N)));
595 if Nkind (Pref) = N_Expanded_Name then
597 -- Done already, if the unit has been compiled indirectly as
598 -- part of the closure of its context because of inlining.
603 while Nkind (Pref) = N_Selected_Component loop
604 Change_Selected_Component_To_Expanded_Name (Pref);
605 Set_Entity (Pref, P_Name);
606 Set_Etype (Pref, Etype (P_Name));
607 Generate_Reference (P_Name, Pref, 'r');
608 Pref := Prefix (Pref);
609 P_Name := Scope (P_Name);
612 -- The guard here on P_Name is to handle the error condition where
613 -- the parent unit is missing because the file was not found.
615 if Present (P_Name) then
616 Set_Entity (Pref, P_Name);
617 Set_Etype (Pref, Etype (P_Name));
618 Generate_Reference (P_Name, Pref, 'r');
619 Style.Check_Identifier (Pref, P_Name);
621 end Generate_Parent_References;
623 -- Start of processing for Analyze_Compilation_Unit
626 Process_Compilation_Unit_Pragmas (N);
628 -- If the unit is a subunit whose parent has not been analyzed (which
629 -- indicates that the main unit is a subunit, either the current one or
630 -- one of its descendents) then the subunit is compiled as part of the
631 -- analysis of the parent, which we proceed to do. Basically this gets
632 -- handled from the top down and we don't want to do anything at this
633 -- level (i.e. this subunit will be handled on the way down from the
634 -- parent), so at this level we immediately return. If the subunit
635 -- ends up not analyzed, it means that the parent did not contain a
636 -- stub for it, or that there errors were detected in some ancestor.
638 if Nkind (Unit_Node) = N_Subunit
639 and then not Analyzed (Lib_Unit)
641 Semantics (Lib_Unit);
643 if not Analyzed (Proper_Body (Unit_Node)) then
644 if Serious_Errors_Detected > 0 then
645 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N);
647 Error_Msg_N ("missing stub for subunit", N);
654 -- Analyze context (this will call Sem recursively for with'ed units)
658 -- If the unit is a package body, the spec is already loaded and must
659 -- be analyzed first, before we analyze the body.
661 if Nkind (Unit_Node) = N_Package_Body then
663 -- If no Lib_Unit, then there was a serious previous error, so
664 -- just ignore the entire analysis effort
666 if No (Lib_Unit) then
670 Semantics (Lib_Unit);
671 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
673 -- Verify that the library unit is a package declaration
675 if not Nkind_In (Unit (Lib_Unit), N_Package_Declaration,
676 N_Generic_Package_Declaration)
679 ("no legal package declaration for package body", N);
682 -- Otherwise, the entity in the declaration is visible. Update
683 -- the version to reflect dependence of this body on the spec.
686 Spec_Id := Defining_Entity (Unit (Lib_Unit));
687 Set_Is_Immediately_Visible (Spec_Id, True);
688 Version_Update (N, Lib_Unit);
690 if Nkind (Defining_Unit_Name (Unit_Node)) =
691 N_Defining_Program_Unit_Name
693 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
698 -- If the unit is a subprogram body, then we similarly need to analyze
699 -- its spec. However, things are a little simpler in this case, because
700 -- here, this analysis is done only for error checking and consistency
701 -- purposes, so there's nothing else to be done.
703 elsif Nkind (Unit_Node) = N_Subprogram_Body then
704 if Acts_As_Spec (N) then
706 -- If the subprogram body is a child unit, we must create a
707 -- declaration for it, in order to properly load the parent(s).
708 -- After this, the original unit does not acts as a spec, because
709 -- there is an explicit one. If this unit appears in a context
710 -- clause, then an implicit with on the parent will be added when
711 -- installing the context. If this is the main unit, there is no
712 -- Unit_Table entry for the declaration (it has the unit number
713 -- of the main unit) and code generation is unaffected.
715 Unum := Get_Cunit_Unit_Number (N);
716 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
718 if Par_Spec_Name /= No_Unit_Name then
721 (Load_Name => Par_Spec_Name,
726 if Unum /= No_Unit then
728 -- Build subprogram declaration and attach parent unit to it
729 -- This subprogram declaration does not come from source,
730 -- Nevertheless the backend must generate debugging info for
731 -- it, and this must be indicated explicitly. We also mark
732 -- the body entity as a child unit now, to prevent a
733 -- cascaded error if the spec entity cannot be entered
734 -- in its scope. Finally we create a Units table entry for
735 -- the subprogram declaration, to maintain a one-to-one
736 -- correspondence with compilation unit nodes. This is
737 -- critical for the tree traversals performed by Codepeer.
740 Loc : constant Source_Ptr := Sloc (N);
741 SCS : constant Boolean :=
742 Get_Comes_From_Source_Default;
745 Set_Comes_From_Source_Default (False);
747 Make_Compilation_Unit (Loc,
748 Context_Items => New_Copy_List (Context_Items (N)),
750 Make_Subprogram_Declaration (Sloc (N),
753 (Specification (Unit_Node))),
755 Make_Compilation_Unit_Aux (Loc));
757 Set_Library_Unit (N, Lib_Unit);
758 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
759 Make_Child_Decl_Unit (N);
760 Semantics (Lib_Unit);
762 -- Now that a separate declaration exists, the body
763 -- of the child unit does not act as spec any longer.
765 Set_Acts_As_Spec (N, False);
766 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
767 Set_Debug_Info_Needed (Defining_Entity (Unit (Lib_Unit)));
768 Set_Comes_From_Source_Default (SCS);
773 -- Here for subprogram with separate declaration
776 Semantics (Lib_Unit);
777 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
778 Version_Update (N, Lib_Unit);
781 -- If this is a child unit, generate references to the parents
783 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
784 N_Defining_Program_Unit_Name
786 Generate_Parent_References (
787 Specification (Unit_Node),
788 Scope (Defining_Entity (Unit (Lib_Unit))));
792 -- If it is a child unit, the parent must be elaborated first and we
793 -- update version, since we are dependent on our parent.
795 if Is_Child_Spec (Unit_Node) then
797 -- The analysis of the parent is done with style checks off
800 Save_Style_Check : constant Boolean := Style_Check;
801 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
802 Cunit_Boolean_Restrictions_Save;
805 if not GNAT_Mode then
806 Style_Check := False;
809 Semantics (Parent_Spec (Unit_Node));
810 Version_Update (N, Parent_Spec (Unit_Node));
811 Style_Check := Save_Style_Check;
812 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
816 -- With the analysis done, install the context. Note that we can't
817 -- install the context from the with clauses as we analyze them, because
818 -- each with clause must be analyzed in a clean visibility context, so
819 -- we have to wait and install them all at once.
823 if Is_Child_Spec (Unit_Node) then
825 -- Set the entities of all parents in the program_unit_name
827 Generate_Parent_References (
828 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
831 -- All components of the context: with-clauses, library unit, ancestors
832 -- if any, (and their context) are analyzed and installed.
834 -- Call special debug routine sm if this is the main unit
836 if Current_Sem_Unit = Main_Unit then
840 -- Now analyze the unit (package, subprogram spec, body) itself
844 if Warn_On_Redundant_Constructs then
845 Check_Redundant_Withs (Context_Items (N));
847 if Nkind (Unit_Node) = N_Package_Body then
848 Check_Redundant_Withs
849 (Context_Items => Context_Items (N),
850 Spec_Context_Items => Context_Items (Lib_Unit));
854 -- The above call might have made Unit_Node an N_Subprogram_Body from
855 -- something else, so propagate any Acts_As_Spec flag.
857 if Nkind (Unit_Node) = N_Subprogram_Body
858 and then Acts_As_Spec (Unit_Node)
860 Set_Acts_As_Spec (N);
863 -- Register predefined units in Rtsfind
866 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
868 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
869 Set_RTU_Loaded (Unit_Node);
873 -- Treat compilation unit pragmas that appear after the library unit
875 if Present (Pragmas_After (Aux_Decls_Node (N))) then
877 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
879 while Present (Prag_Node) loop
886 -- Generate distribution stubs if requested and no error
889 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
891 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
892 and then not Fatal_Error (Main_Unit)
894 if Is_RCI_Pkg_Spec_Or_Body (N) then
896 -- Regular RCI package
898 Add_Stub_Constructs (N);
900 elsif (Nkind (Unit_Node) = N_Package_Declaration
901 and then Is_Shared_Passive (Defining_Entity
902 (Specification (Unit_Node))))
903 or else (Nkind (Unit_Node) = N_Package_Body
905 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
907 -- Shared passive package
909 Add_Stub_Constructs (N);
911 elsif Nkind (Unit_Node) = N_Package_Instantiation
913 Is_Remote_Call_Interface
914 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
916 -- Instantiation of a RCI generic package
918 Add_Stub_Constructs (N);
922 -- Remove unit from visibility, so that environment is clean for
923 -- the next compilation, which is either the main unit or some
924 -- other unit in the context.
926 if Nkind_In (Unit_Node, N_Package_Declaration,
927 N_Package_Renaming_Declaration,
928 N_Subprogram_Declaration)
929 or else Nkind (Unit_Node) in N_Generic_Declaration
931 (Nkind (Unit_Node) = N_Subprogram_Body
932 and then Acts_As_Spec (Unit_Node))
934 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
936 -- If the unit is an instantiation whose body will be elaborated for
937 -- inlining purposes, use the proper entity of the instance. The
938 -- entity may be missing if the instantiation was illegal.
940 elsif Nkind (Unit_Node) = N_Package_Instantiation
941 and then not Error_Posted (Unit_Node)
942 and then Present (Instance_Spec (Unit_Node))
944 Remove_Unit_From_Visibility
945 (Defining_Entity (Instance_Spec (Unit_Node)));
947 elsif Nkind (Unit_Node) = N_Package_Body
948 or else (Nkind (Unit_Node) = N_Subprogram_Body
949 and then not Acts_As_Spec (Unit_Node))
951 -- Bodies that are not the main unit are compiled if they are generic
952 -- or contain generic or inlined units. Their analysis brings in the
953 -- context of the corresponding spec (unit declaration) which must be
954 -- removed as well, to return the compilation environment to its
957 Remove_Context (Lib_Unit);
958 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
961 -- Last step is to deinstall the context we just installed as well as
962 -- the unit just compiled.
966 -- If this is the main unit and we are generating code, we must check
967 -- that all generic units in the context have a body if they need it,
968 -- even if they have not been instantiated. In the absence of .ali files
969 -- for generic units, we must force the load of the body, just to
970 -- produce the proper error if the body is absent. We skip this
971 -- verification if the main unit itself is generic.
973 if Get_Cunit_Unit_Number (N) = Main_Unit
974 and then Operating_Mode = Generate_Code
975 and then Expander_Active
977 -- Check whether the source for the body of the unit must be included
978 -- in a standalone library.
980 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
982 -- Indicate that the main unit is now analyzed, to catch possible
983 -- circularities between it and generic bodies. Remove main unit from
984 -- visibility. This might seem superfluous, but the main unit must
985 -- not be visible in the generic body expansions that follow.
987 Set_Analyzed (N, True);
988 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
993 Un : Unit_Number_Type;
995 Save_Style_Check : constant Boolean := Style_Check;
996 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
997 Cunit_Boolean_Restrictions_Save;
1000 Item := First (Context_Items (N));
1001 while Present (Item) loop
1003 -- Check for explicit with clause
1005 if Nkind (Item) = N_With_Clause
1006 and then not Implicit_With (Item)
1008 -- Ada 2005 (AI-50217): Ignore limited-withed units
1010 and then not Limited_Present (Item)
1012 Nam := Entity (Name (Item));
1014 -- Compile generic subprogram, unless it is intrinsic or
1015 -- imported so no body is required, or generic package body
1016 -- if the package spec requires a body.
1018 if (Is_Generic_Subprogram (Nam)
1019 and then not Is_Intrinsic_Subprogram (Nam)
1020 and then not Is_Imported (Nam))
1021 or else (Ekind (Nam) = E_Generic_Package
1022 and then Unit_Requires_Body (Nam))
1024 Style_Check := False;
1026 if Present (Renamed_Object (Nam)) then
1029 (Load_Name => Get_Body_Name
1031 (Unit_Declaration_Node
1032 (Renamed_Object (Nam)))),
1040 (Load_Name => Get_Body_Name
1041 (Get_Unit_Name (Item)),
1048 if Un = No_Unit then
1050 ("body of generic unit& not found", Item, Nam);
1053 elsif not Analyzed (Cunit (Un))
1054 and then Un /= Main_Unit
1055 and then not Fatal_Error (Un)
1057 Style_Check := False;
1058 Semantics (Cunit (Un));
1066 Style_Check := Save_Style_Check;
1067 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1071 -- Deal with creating elaboration Boolean if needed. We create an
1072 -- elaboration boolean only for units that come from source since
1073 -- units manufactured by the compiler never need elab checks.
1075 if Comes_From_Source (N)
1076 and then Nkind_In (Unit_Node, N_Package_Declaration,
1077 N_Generic_Package_Declaration,
1078 N_Subprogram_Declaration,
1079 N_Generic_Subprogram_Declaration)
1082 Loc : constant Source_Ptr := Sloc (N);
1083 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1086 Spec_Id := Defining_Entity (Unit_Node);
1087 Generate_Definition (Spec_Id);
1089 -- See if an elaboration entity is required for possible access
1090 -- before elaboration checking. Note that we must allow for this
1091 -- even if -gnatE is not set, since a client may be compiled in
1092 -- -gnatE mode and reference the entity.
1094 -- These entities are also used by the binder to prevent multiple
1095 -- attempts to execute the elaboration code for the library case
1096 -- where the elaboration routine might otherwise be called more
1099 -- Case of units which do not require elaboration checks
1102 -- Pure units do not need checks
1106 -- Preelaborated units do not need checks
1108 or else Is_Preelaborated (Spec_Id)
1110 -- No checks needed if pragma Elaborate_Body present
1112 or else Has_Pragma_Elaborate_Body (Spec_Id)
1114 -- No checks needed if unit does not require a body
1116 or else not Unit_Requires_Body (Spec_Id)
1118 -- No checks needed for predefined files
1120 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1122 -- No checks required if no separate spec
1124 or else Acts_As_Spec (N)
1126 -- This is a case where we only need the entity for
1127 -- checking to prevent multiple elaboration checks.
1129 Set_Elaboration_Entity_Required (Spec_Id, False);
1131 -- Case of elaboration entity is required for access before
1132 -- elaboration checking (so certainly we must build it!)
1135 Set_Elaboration_Entity_Required (Spec_Id, True);
1138 Build_Elaboration_Entity (N, Spec_Id);
1142 -- Freeze the compilation unit entity. This for sure is needed because
1143 -- of some warnings that can be output (see Freeze_Subprogram), but may
1144 -- in general be required. If freezing actions result, place them in the
1145 -- compilation unit actions list, and analyze them.
1148 Loc : constant Source_Ptr := Sloc (N);
1149 L : constant List_Id :=
1150 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), Loc);
1152 while Is_Non_Empty_List (L) loop
1153 Insert_Library_Level_Action (Remove_Head (L));
1159 if Nkind (Unit_Node) = N_Package_Declaration
1160 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1161 and then Expander_Active
1164 Save_Style_Check : constant Boolean := Style_Check;
1165 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1166 Options : Style_Check_Options;
1169 Save_Style_Check_Options (Options);
1170 Reset_Style_Check_Options;
1171 Opt.Warning_Mode := Suppress;
1172 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1174 Reset_Style_Check_Options;
1175 Set_Style_Check_Options (Options);
1176 Style_Check := Save_Style_Check;
1177 Warning_Mode := Save_Warning;
1181 -- If we are generating obsolescent warnings, then here is where we
1182 -- generate them for the with'ed items. The reason for this special
1183 -- processing is that the normal mechanism of generating the warnings
1184 -- for referenced entities does not work for context clause references.
1185 -- That's because when we first analyze the context, it is too early to
1186 -- know if the with'ing unit is itself obsolescent (which suppresses
1189 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1191 -- Push current compilation unit as scope, so that the test for
1192 -- being within an obsolescent unit will work correctly.
1194 Push_Scope (Defining_Entity (Unit_Node));
1196 -- Loop through context items to deal with with clauses
1204 Item := First (Context_Items (N));
1205 while Present (Item) loop
1206 if Nkind (Item) = N_With_Clause
1208 -- Suppress this check in limited-withed units. Further work
1209 -- needed here if we decide to incorporate this check on
1210 -- limited-withed units.
1212 and then not Limited_Present (Item)
1215 Ent := Entity (Nam);
1217 if Is_Obsolescent (Ent) then
1218 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1226 -- Remove temporary install of current unit as scope
1230 end Analyze_Compilation_Unit;
1232 ---------------------
1233 -- Analyze_Context --
1234 ---------------------
1236 procedure Analyze_Context (N : Node_Id) is
1237 Ukind : constant Node_Kind := Nkind (Unit (N));
1241 -- First process all configuration pragmas at the start of the context
1242 -- items. Strictly these are not part of the context clause, but that
1243 -- is where the parser puts them. In any case for sure we must analyze
1244 -- these before analyzing the actual context items, since they can have
1245 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1246 -- be with'ed as a result of changing categorizations in Ada 2005).
1248 Item := First (Context_Items (N));
1249 while Present (Item)
1250 and then Nkind (Item) = N_Pragma
1251 and then Pragma_Name (Item) in Configuration_Pragma_Names
1257 -- This is the point at which we capture the configuration settings
1258 -- for the unit. At the moment only the Optimize_Alignment setting
1259 -- needs to be captured. Probably more later ???
1261 if Optimize_Alignment_Local then
1262 Set_OA_Setting (Current_Sem_Unit, 'L');
1264 Set_OA_Setting (Current_Sem_Unit, Optimize_Alignment);
1267 -- Loop through actual context items. This is done in two passes:
1269 -- a) The first pass analyzes non-limited with-clauses and also any
1270 -- configuration pragmas (we need to get the latter analyzed right
1271 -- away, since they can affect processing of subsequent items.
1273 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1275 while Present (Item) loop
1277 -- For with clause, analyze the with clause, and then update
1278 -- the version, since we are dependent on a unit that we with.
1280 if Nkind (Item) = N_With_Clause
1281 and then not Limited_Present (Item)
1283 -- Skip analyzing with clause if no unit, nothing to do (this
1284 -- happens for a with that references a non-existent unit)
1285 -- Skip as well if this is a with_clause for the main unit, which
1286 -- happens if a subunit has a useless with_clause on its parent.
1288 if Present (Library_Unit (Item)) then
1289 if Library_Unit (Item) /= Cunit (Current_Sem_Unit) then
1293 Set_Entity (Name (Item), Cunit_Entity (Current_Sem_Unit));
1297 if not Implicit_With (Item) then
1298 Version_Update (N, Library_Unit (Item));
1301 -- Skip pragmas. Configuration pragmas at the start were handled in
1302 -- the loop above, and remaining pragmas are not processed until we
1303 -- actually install the context (see Install_Context). We delay the
1304 -- analysis of these pragmas to make sure that we have installed all
1305 -- the implicit with's on parent units.
1307 -- Skip use clauses at this stage, since we don't want to do any
1308 -- installing of potentially use-visible entities until we
1309 -- actually install the complete context (in Install_Context).
1310 -- Otherwise things can get installed in the wrong context.
1319 -- Second pass: examine all limited_with clauses. All other context
1320 -- items are ignored in this pass.
1322 Item := First (Context_Items (N));
1323 while Present (Item) loop
1324 if Nkind (Item) = N_With_Clause
1325 and then Limited_Present (Item)
1327 -- No need to check errors on implicitly generated limited-with
1330 if not Implicit_With (Item) then
1332 -- Verify that the illegal contexts given in 10.1.2 (18/2)
1333 -- are properly rejected, including renaming declarations.
1335 if not Nkind_In (Ukind, N_Package_Declaration,
1336 N_Subprogram_Declaration)
1337 and then Ukind not in N_Generic_Declaration
1338 and then Ukind not in N_Generic_Instantiation
1340 Error_Msg_N ("limited with_clause not allowed here", Item);
1342 -- Check wrong use of a limited with clause applied to the
1343 -- compilation unit containing the limited-with clause.
1345 -- limited with P.Q;
1346 -- package P.Q is ...
1348 elsif Unit (Library_Unit (Item)) = Unit (N) then
1349 Error_Msg_N ("wrong use of limited-with clause", Item);
1351 -- Check wrong use of limited-with clause applied to some
1352 -- immediate ancestor.
1354 elsif Is_Child_Spec (Unit (N)) then
1356 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1360 P := Parent_Spec (Unit (N));
1362 if Unit (P) = Lib_U then
1363 Error_Msg_N ("limited with_clause of immediate "
1364 & "ancestor not allowed", Item);
1368 exit when not Is_Child_Spec (Unit (P));
1369 P := Parent_Spec (Unit (P));
1374 -- Check if the limited-withed unit is already visible through
1375 -- some context clause of the current compilation unit or some
1376 -- ancestor of the current compilation unit.
1379 Lim_Unit_Name : constant Node_Id := Name (Item);
1380 Comp_Unit : Node_Id;
1382 Unit_Name : Node_Id;
1387 It := First (Context_Items (Comp_Unit));
1388 while Present (It) loop
1390 and then Nkind (It) = N_With_Clause
1391 and then not Limited_Present (It)
1393 Nkind_In (Unit (Library_Unit (It)),
1394 N_Package_Declaration,
1395 N_Package_Renaming_Declaration)
1397 if Nkind (Unit (Library_Unit (It))) =
1398 N_Package_Declaration
1400 Unit_Name := Name (It);
1402 Unit_Name := Name (Unit (Library_Unit (It)));
1405 -- Check if the named package (or some ancestor)
1406 -- leaves visible the full-view of the unit given
1407 -- in the limited-with clause
1410 if Designate_Same_Unit (Lim_Unit_Name,
1413 Error_Msg_Sloc := Sloc (It);
1415 ("simultaneous visibility of limited "
1416 & "and unlimited views not allowed",
1419 ("\unlimited view visible through "
1420 & "context clause #",
1424 elsif Nkind (Unit_Name) = N_Identifier then
1428 Unit_Name := Prefix (Unit_Name);
1435 exit when not Is_Child_Spec (Unit (Comp_Unit));
1437 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1442 -- Skip analyzing with clause if no unit, see above
1444 if Present (Library_Unit (Item)) then
1448 -- A limited_with does not impose an elaboration order, but
1449 -- there is a semantic dependency for recompilation purposes.
1451 if not Implicit_With (Item) then
1452 Version_Update (N, Library_Unit (Item));
1455 -- Pragmas and use clauses and with clauses other than limited
1456 -- with's are ignored in this pass through the context items.
1464 end Analyze_Context;
1466 -------------------------------
1467 -- Analyze_Package_Body_Stub --
1468 -------------------------------
1470 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1471 Id : constant Entity_Id := Defining_Identifier (N);
1475 -- The package declaration must be in the current declarative part
1477 Check_Stub_Level (N);
1478 Nam := Current_Entity_In_Scope (Id);
1480 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1481 Error_Msg_N ("missing specification for package stub", N);
1483 elsif Has_Completion (Nam)
1484 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1486 Error_Msg_N ("duplicate or redundant stub for package", N);
1489 -- Indicate that the body of the package exists. If we are doing
1490 -- only semantic analysis, the stub stands for the body. If we are
1491 -- generating code, the existence of the body will be confirmed
1492 -- when we load the proper body.
1494 Set_Has_Completion (Nam);
1495 Set_Scope (Defining_Entity (N), Current_Scope);
1496 Generate_Reference (Nam, Id, 'b');
1497 Analyze_Proper_Body (N, Nam);
1499 end Analyze_Package_Body_Stub;
1501 -------------------------
1502 -- Analyze_Proper_Body --
1503 -------------------------
1505 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1506 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1507 Unum : Unit_Number_Type;
1509 procedure Optional_Subunit;
1510 -- This procedure is called when the main unit is a stub, or when we
1511 -- are not generating code. In such a case, we analyze the subunit if
1512 -- present, which is user-friendly and in fact required for ASIS, but
1513 -- we don't complain if the subunit is missing.
1515 ----------------------
1516 -- Optional_Subunit --
1517 ----------------------
1519 procedure Optional_Subunit is
1520 Comp_Unit : Node_Id;
1523 -- Try to load subunit, but ignore any errors that occur during
1524 -- the loading of the subunit, by using the special feature in
1525 -- Errout to ignore all errors. Note that Fatal_Error will still
1526 -- be set, so we will be able to check for this case below.
1528 if not ASIS_Mode then
1529 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1534 (Load_Name => Subunit_Name,
1539 if not ASIS_Mode then
1540 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1543 -- All done if we successfully loaded the subunit
1546 and then (not Fatal_Error (Unum) or else Try_Semantics)
1548 Comp_Unit := Cunit (Unum);
1550 -- If the file was empty or seriously mangled, the unit
1551 -- itself may be missing.
1553 if No (Unit (Comp_Unit)) then
1555 ("subunit does not contain expected proper body", N);
1557 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1559 ("expected SEPARATE subunit, found child unit",
1560 Cunit_Entity (Unum));
1562 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1563 Analyze_Subunit (Comp_Unit);
1564 Set_Library_Unit (N, Comp_Unit);
1567 elsif Unum = No_Unit
1568 and then Present (Nam)
1570 if Is_Protected_Type (Nam) then
1571 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1573 Set_Corresponding_Body (
1574 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1577 end Optional_Subunit;
1579 -- Start of processing for Analyze_Proper_Body
1582 -- If the subunit is already loaded, it means that the main unit
1583 -- is a subunit, and that the current unit is one of its parents
1584 -- which was being analyzed to provide the needed context for the
1585 -- analysis of the subunit. In this case we analyze the subunit and
1586 -- continue with the parent, without looking a subsequent subunits.
1588 if Is_Loaded (Subunit_Name) then
1590 -- If the proper body is already linked to the stub node,
1591 -- the stub is in a generic unit and just needs analyzing.
1593 if Present (Library_Unit (N)) then
1594 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1595 Analyze_Subunit (Library_Unit (N));
1597 -- Otherwise we must load the subunit and link to it
1600 -- Load the subunit, this must work, since we originally
1601 -- loaded the subunit earlier on. So this will not really
1602 -- load it, just give access to it.
1606 (Load_Name => Subunit_Name,
1611 -- And analyze the subunit in the parent context (note that we
1612 -- do not call Semantics, since that would remove the parent
1613 -- context). Because of this, we have to manually reset the
1614 -- compiler state to Analyzing since it got destroyed by Load.
1616 if Unum /= No_Unit then
1617 Compiler_State := Analyzing;
1619 -- Check that the proper body is a subunit and not a child
1620 -- unit. If the unit was previously loaded, the error will
1621 -- have been emitted when copying the generic node, so we
1622 -- just return to avoid cascaded errors.
1624 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1628 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1629 Analyze_Subunit (Cunit (Unum));
1630 Set_Library_Unit (N, Cunit (Unum));
1634 -- If the main unit is a subunit, then we are just performing semantic
1635 -- analysis on that subunit, and any other subunits of any parent unit
1636 -- should be ignored, except that if we are building trees for ASIS
1637 -- usage we want to annotate the stub properly.
1639 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1640 and then Subunit_Name /= Unit_Name (Main_Unit)
1646 -- But before we return, set the flag for unloaded subunits. This
1647 -- will suppress junk warnings of variables in the same declarative
1648 -- part (or a higher level one) that are in danger of looking unused
1649 -- when in fact there might be a declaration in the subunit that we
1650 -- do not intend to load.
1652 Unloaded_Subunits := True;
1655 -- If the subunit is not already loaded, and we are generating code,
1656 -- then this is the case where compilation started from the parent,
1657 -- and we are generating code for an entire subunit tree. In that
1658 -- case we definitely need to load the subunit.
1660 -- In order to continue the analysis with the rest of the parent,
1661 -- and other subunits, we load the unit without requiring its
1662 -- presence, and emit a warning if not found, rather than terminating
1663 -- the compilation abruptly, as for other missing file problems.
1665 elsif Original_Operating_Mode = Generate_Code then
1667 -- If the proper body is already linked to the stub node,
1668 -- the stub is in a generic unit and just needs analyzing.
1670 -- We update the version. Although we are not technically
1671 -- semantically dependent on the subunit, given our approach
1672 -- of macro substitution of subunits, it makes sense to
1673 -- include it in the version identification.
1675 if Present (Library_Unit (N)) then
1676 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1677 Analyze_Subunit (Library_Unit (N));
1678 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1680 -- Otherwise we must load the subunit and link to it
1685 (Load_Name => Subunit_Name,
1690 if Original_Operating_Mode = Generate_Code
1691 and then Unum = No_Unit
1693 Error_Msg_Unit_1 := Subunit_Name;
1695 Get_File_Name (Subunit_Name, Subunit => True);
1697 ("subunit$$ in file{ not found?", N);
1698 Subunits_Missing := True;
1701 -- Load_Unit may reset Compiler_State, since it may have been
1702 -- necessary to parse an additional units, so we make sure
1703 -- that we reset it to the Analyzing state.
1705 Compiler_State := Analyzing;
1707 if Unum /= No_Unit then
1708 if Debug_Flag_L then
1709 Write_Str ("*** Loaded subunit from stub. Analyze");
1714 Comp_Unit : constant Node_Id := Cunit (Unum);
1717 -- Check for child unit instead of subunit
1719 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1721 ("expected SEPARATE subunit, found child unit",
1722 Cunit_Entity (Unum));
1724 -- OK, we have a subunit
1727 -- Set corresponding stub (even if errors)
1729 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1731 -- Analyze the unit if semantics active
1733 if not Fatal_Error (Unum) or else Try_Semantics then
1734 Analyze_Subunit (Comp_Unit);
1737 -- Set the library unit pointer in any case
1739 Set_Library_Unit (N, Comp_Unit);
1741 -- We update the version. Although we are not technically
1742 -- semantically dependent on the subunit, given our
1743 -- approach of macro substitution of subunits, it makes
1744 -- sense to include it in the version identification.
1746 Version_Update (Cunit (Main_Unit), Comp_Unit);
1752 -- The remaining case is when the subunit is not already loaded and
1753 -- we are not generating code. In this case we are just performing
1754 -- semantic analysis on the parent, and we are not interested in
1755 -- the subunit. For subprograms, analyze the stub as a body. For
1756 -- other entities the stub has already been marked as completed.
1761 end Analyze_Proper_Body;
1763 ----------------------------------
1764 -- Analyze_Protected_Body_Stub --
1765 ----------------------------------
1767 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1768 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1771 Check_Stub_Level (N);
1773 -- First occurrence of name may have been as an incomplete type
1775 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1776 Nam := Full_View (Nam);
1780 or else not Is_Protected_Type (Etype (Nam))
1782 Error_Msg_N ("missing specification for Protected body", N);
1784 Set_Scope (Defining_Entity (N), Current_Scope);
1785 Set_Has_Completion (Etype (Nam));
1786 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1787 Analyze_Proper_Body (N, Etype (Nam));
1789 end Analyze_Protected_Body_Stub;
1791 ----------------------------------
1792 -- Analyze_Subprogram_Body_Stub --
1793 ----------------------------------
1795 -- A subprogram body stub can appear with or without a previous
1796 -- specification. If there is one, the analysis of the body will
1797 -- find it and verify conformance. The formals appearing in the
1798 -- specification of the stub play no role, except for requiring an
1799 -- additional conformance check. If there is no previous subprogram
1800 -- declaration, the stub acts as a spec, and provides the defining
1801 -- entity for the subprogram.
1803 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1807 Check_Stub_Level (N);
1809 -- Verify that the identifier for the stub is unique within this
1810 -- declarative part.
1812 if Nkind_In (Parent (N), N_Block_Statement,
1816 Decl := First (Declarations (Parent (N)));
1817 while Present (Decl)
1820 if Nkind (Decl) = N_Subprogram_Body_Stub
1821 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1822 Chars (Defining_Unit_Name (Specification (N))))
1824 Error_Msg_N ("identifier for stub is not unique", N);
1831 -- Treat stub as a body, which checks conformance if there is a previous
1832 -- declaration, or else introduces entity and its signature.
1834 Analyze_Subprogram_Body (N);
1835 Analyze_Proper_Body (N, Empty);
1836 end Analyze_Subprogram_Body_Stub;
1838 ---------------------
1839 -- Analyze_Subunit --
1840 ---------------------
1842 -- A subunit is compiled either by itself (for semantic checking)
1843 -- or as part of compiling the parent (for code generation). In
1844 -- either case, by the time we actually process the subunit, the
1845 -- parent has already been installed and analyzed. The node N is
1846 -- a compilation unit, whose context needs to be treated here,
1847 -- because we come directly here from the parent without calling
1848 -- Analyze_Compilation_Unit.
1850 -- The compilation context includes the explicit context of the
1851 -- subunit, and the context of the parent, together with the parent
1852 -- itself. In order to compile the current context, we remove the
1853 -- one inherited from the parent, in order to have a clean visibility
1854 -- table. We restore the parent context before analyzing the proper
1855 -- body itself. On exit, we remove only the explicit context of the
1858 procedure Analyze_Subunit (N : Node_Id) is
1859 Lib_Unit : constant Node_Id := Library_Unit (N);
1860 Par_Unit : constant Entity_Id := Current_Scope;
1862 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1863 Num_Scopes : Int := 0;
1864 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1865 Enclosing_Child : Entity_Id := Empty;
1866 Svg : constant Suppress_Array := Scope_Suppress;
1868 procedure Analyze_Subunit_Context;
1869 -- Capture names in use clauses of the subunit. This must be done
1870 -- before re-installing parent declarations, because items in the
1871 -- context must not be hidden by declarations local to the parent.
1873 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1874 -- Recursive procedure to restore scope of all ancestors of subunit,
1875 -- from outermost in. If parent is not a subunit, the call to install
1876 -- context installs context of spec and (if parent is a child unit)
1877 -- the context of its parents as well. It is confusing that parents
1878 -- should be treated differently in both cases, but the semantics are
1879 -- just not identical.
1881 procedure Re_Install_Use_Clauses;
1882 -- As part of the removal of the parent scope, the use clauses are
1883 -- removed, to be reinstalled when the context of the subunit has
1884 -- been analyzed. Use clauses may also have been affected by the
1885 -- analysis of the context of the subunit, so they have to be applied
1886 -- again, to insure that the compilation environment of the rest of
1887 -- the parent unit is identical.
1889 procedure Remove_Scope;
1890 -- Remove current scope from scope stack, and preserve the list
1891 -- of use clauses in it, to be reinstalled after context is analyzed.
1893 -----------------------------
1894 -- Analyze_Subunit_Context --
1895 -----------------------------
1897 procedure Analyze_Subunit_Context is
1900 Unit_Name : Entity_Id;
1903 Analyze_Context (N);
1905 -- Make withed units immediately visible. If child unit, make the
1906 -- ultimate parent immediately visible.
1908 Item := First (Context_Items (N));
1909 while Present (Item) loop
1910 if Nkind (Item) = N_With_Clause then
1912 -- Protect frontend against previous errors in context clauses
1914 if Nkind (Name (Item)) /= N_Selected_Component then
1915 if Error_Posted (Item) then
1919 Unit_Name := Entity (Name (Item));
1920 while Is_Child_Unit (Unit_Name) loop
1921 Set_Is_Visible_Child_Unit (Unit_Name);
1922 Unit_Name := Scope (Unit_Name);
1925 if not Is_Immediately_Visible (Unit_Name) then
1926 Set_Is_Immediately_Visible (Unit_Name);
1927 Set_Context_Installed (Item);
1932 elsif Nkind (Item) = N_Use_Package_Clause then
1933 Nam := First (Names (Item));
1934 while Present (Nam) loop
1939 elsif Nkind (Item) = N_Use_Type_Clause then
1940 Nam := First (Subtype_Marks (Item));
1941 while Present (Nam) loop
1950 -- Reset visibility of withed units. They will be made visible
1951 -- again when we install the subunit context.
1953 Item := First (Context_Items (N));
1954 while Present (Item) loop
1955 if Nkind (Item) = N_With_Clause
1957 -- Protect frontend against previous errors in context clauses
1959 and then Nkind (Name (Item)) /= N_Selected_Component
1960 and then not Error_Posted (Item)
1962 Unit_Name := Entity (Name (Item));
1963 while Is_Child_Unit (Unit_Name) loop
1964 Set_Is_Visible_Child_Unit (Unit_Name, False);
1965 Unit_Name := Scope (Unit_Name);
1968 if Context_Installed (Item) then
1969 Set_Is_Immediately_Visible (Unit_Name, False);
1970 Set_Context_Installed (Item, False);
1976 end Analyze_Subunit_Context;
1978 ------------------------
1979 -- Re_Install_Parents --
1980 ------------------------
1982 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
1986 if Nkind (Unit (L)) = N_Subunit then
1987 Re_Install_Parents (Library_Unit (L), Scope (Scop));
1990 Install_Context (L);
1992 -- If the subunit occurs within a child unit, we must restore the
1993 -- immediate visibility of any siblings that may occur in context.
1995 if Present (Enclosing_Child) then
1996 Install_Siblings (Enclosing_Child, L);
2001 if Scop /= Par_Unit then
2002 Set_Is_Immediately_Visible (Scop);
2005 -- Make entities in scope visible again. For child units, restore
2006 -- visibility only if they are actually in context.
2008 E := First_Entity (Current_Scope);
2009 while Present (E) loop
2010 if not Is_Child_Unit (E)
2011 or else Is_Visible_Child_Unit (E)
2013 Set_Is_Immediately_Visible (E);
2019 -- A subunit appears within a body, and for a nested subunits
2020 -- all the parents are bodies. Restore full visibility of their
2021 -- private entities.
2023 if Is_Package_Or_Generic_Package (Scop) then
2024 Set_In_Package_Body (Scop);
2025 Install_Private_Declarations (Scop);
2027 end Re_Install_Parents;
2029 ----------------------------
2030 -- Re_Install_Use_Clauses --
2031 ----------------------------
2033 procedure Re_Install_Use_Clauses is
2036 for J in reverse 1 .. Num_Scopes loop
2037 U := Use_Clauses (J);
2038 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2039 Install_Use_Clauses (U, Force_Installation => True);
2041 end Re_Install_Use_Clauses;
2047 procedure Remove_Scope is
2051 Num_Scopes := Num_Scopes + 1;
2052 Use_Clauses (Num_Scopes) :=
2053 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2055 E := First_Entity (Current_Scope);
2056 while Present (E) loop
2057 Set_Is_Immediately_Visible (E, False);
2061 if Is_Child_Unit (Current_Scope) then
2062 Enclosing_Child := Current_Scope;
2068 -- Start of processing for Analyze_Subunit
2071 if not Is_Empty_List (Context_Items (N)) then
2073 -- Save current use clauses
2076 Remove_Context (Lib_Unit);
2078 -- Now remove parents and their context, including enclosing
2079 -- subunits and the outer parent body which is not a subunit.
2081 if Present (Lib_Spec) then
2082 Remove_Context (Lib_Spec);
2084 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2085 Lib_Spec := Library_Unit (Lib_Spec);
2087 Remove_Context (Lib_Spec);
2090 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2094 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2095 Remove_Context (Library_Unit (Lib_Spec));
2099 Set_Is_Immediately_Visible (Par_Unit, False);
2101 Analyze_Subunit_Context;
2103 Re_Install_Parents (Lib_Unit, Par_Unit);
2104 Set_Is_Immediately_Visible (Par_Unit);
2106 -- If the context includes a child unit of the parent of the
2107 -- subunit, the parent will have been removed from visibility,
2108 -- after compiling that cousin in the context. The visibility
2109 -- of the parent must be restored now. This also applies if the
2110 -- context includes another subunit of the same parent which in
2111 -- turn includes a child unit in its context.
2113 if Is_Package_Or_Generic_Package (Par_Unit) then
2114 if not Is_Immediately_Visible (Par_Unit)
2115 or else (Present (First_Entity (Par_Unit))
2116 and then not Is_Immediately_Visible
2117 (First_Entity (Par_Unit)))
2119 Set_Is_Immediately_Visible (Par_Unit);
2120 Install_Visible_Declarations (Par_Unit);
2121 Install_Private_Declarations (Par_Unit);
2125 Re_Install_Use_Clauses;
2126 Install_Context (N);
2128 -- Restore state of suppress flags for current body
2130 Scope_Suppress := Svg;
2132 -- If the subunit is within a child unit, then siblings of any
2133 -- parent unit that appear in the context clause of the subunit
2134 -- must also be made immediately visible.
2136 if Present (Enclosing_Child) then
2137 Install_Siblings (Enclosing_Child, N);
2142 Analyze (Proper_Body (Unit (N)));
2145 -- The subunit may contain a with_clause on a sibling of some
2146 -- ancestor. Removing the context will remove from visibility those
2147 -- ancestor child units, which must be restored to the visibility
2148 -- they have in the enclosing body.
2150 if Present (Enclosing_Child) then
2156 and then Is_Child_Unit (C)
2158 Set_Is_Immediately_Visible (C);
2159 Set_Is_Visible_Child_Unit (C);
2164 end Analyze_Subunit;
2166 ----------------------------
2167 -- Analyze_Task_Body_Stub --
2168 ----------------------------
2170 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2171 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2172 Loc : constant Source_Ptr := Sloc (N);
2175 Check_Stub_Level (N);
2177 -- First occurrence of name may have been as an incomplete type
2179 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2180 Nam := Full_View (Nam);
2184 or else not Is_Task_Type (Etype (Nam))
2186 Error_Msg_N ("missing specification for task body", N);
2188 Set_Scope (Defining_Entity (N), Current_Scope);
2189 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2190 Set_Has_Completion (Etype (Nam));
2191 Analyze_Proper_Body (N, Etype (Nam));
2193 -- Set elaboration flag to indicate that entity is callable.
2194 -- This cannot be done in the expansion of the body itself,
2195 -- because the proper body is not in a declarative part. This
2196 -- is only done if expansion is active, because the context
2197 -- may be generic and the flag not defined yet.
2199 if Expander_Active then
2201 Make_Assignment_Statement (Loc,
2203 Make_Identifier (Loc,
2204 New_External_Name (Chars (Etype (Nam)), 'E')),
2205 Expression => New_Reference_To (Standard_True, Loc)));
2209 end Analyze_Task_Body_Stub;
2211 -------------------------
2212 -- Analyze_With_Clause --
2213 -------------------------
2215 -- Analyze the declaration of a unit in a with clause. At end,
2216 -- label the with clause with the defining entity for the unit.
2218 procedure Analyze_With_Clause (N : Node_Id) is
2220 -- Retrieve the original kind of the unit node, before analysis.
2221 -- If it is a subprogram instantiation, its analysis below will
2222 -- rewrite as the declaration of the wrapper package. If the same
2223 -- instantiation appears indirectly elsewhere in the context, it
2224 -- will have been analyzed already.
2226 Unit_Kind : constant Node_Kind :=
2227 Nkind (Original_Node (Unit (Library_Unit (N))));
2228 Nam : constant Node_Id := Name (N);
2230 Par_Name : Entity_Id;
2235 -- Set True if the unit currently being compiled is an internal unit
2237 Save_Style_Check : constant Boolean := Opt.Style_Check;
2238 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
2239 Cunit_Boolean_Restrictions_Save;
2242 U := Unit (Library_Unit (N));
2244 -- Several actions are skipped for dummy packages (those supplied for
2245 -- with's where no matching file could be found). Such packages are
2246 -- identified by the Sloc value being set to No_Location.
2248 if Limited_Present (N) then
2250 -- Ada 2005 (AI-50217): Build visibility structures but do not
2251 -- analyze the unit.
2253 if Sloc (U) /= No_Location then
2254 Build_Limited_Views (N);
2260 -- We reset ordinary style checking during the analysis of a with'ed
2261 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2262 -- definitely *does* apply to with'ed units).
2264 if not GNAT_Mode then
2265 Style_Check := False;
2268 -- If the library unit is a predefined unit, and we are in high
2269 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2270 -- for the analysis of the with'ed unit. This mode does not prevent
2271 -- explicit with'ing of run-time units.
2273 if Configurable_Run_Time_Mode
2275 Is_Predefined_File_Name
2276 (Unit_File_Name (Get_Source_Unit (Unit (Library_Unit (N)))))
2278 Configurable_Run_Time_Mode := False;
2279 Semantics (Library_Unit (N));
2280 Configurable_Run_Time_Mode := True;
2283 Semantics (Library_Unit (N));
2286 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2288 if Sloc (U) /= No_Location then
2290 -- Check restrictions, except that we skip the check if this is an
2291 -- internal unit unless we are compiling the internal unit as the
2292 -- main unit. We also skip this for dummy packages.
2294 Check_Restriction_No_Dependence (Nam, N);
2296 if not Intunit or else Current_Sem_Unit = Main_Unit then
2297 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2300 -- Deal with special case of GNAT.Current_Exceptions which interacts
2301 -- with the optimization of local raise statements into gotos.
2303 if Nkind (Nam) = N_Selected_Component
2304 and then Nkind (Prefix (Nam)) = N_Identifier
2305 and then Chars (Prefix (Nam)) = Name_Gnat
2306 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2308 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2310 Check_Restriction (No_Exception_Propagation, N);
2311 Special_Exception_Package_Used := True;
2314 -- Check for inappropriate with of internal implementation unit if we
2315 -- are currently compiling the main unit and the main unit is itself
2316 -- not an internal unit. We do not issue this message for implicit
2317 -- with's generated by the compiler itself.
2319 if Implementation_Unit_Warnings
2320 and then Current_Sem_Unit = Main_Unit
2321 and then not Intunit
2322 and then not Implicit_With (N)
2323 and then not GNAT_Mode
2326 U_Kind : constant Kind_Of_Unit :=
2327 Get_Kind_Of_Unit (Get_Source_Unit (U));
2330 if U_Kind = Implementation_Unit then
2331 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2333 ("\use of this unit is non-portable " &
2334 "and version-dependent?",
2337 elsif U_Kind = Ada_05_Unit
2338 and then Ada_Version < Ada_05
2339 and then Warn_On_Ada_2005_Compatibility
2341 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2347 -- Semantic analysis of a generic unit is performed on a copy of
2348 -- the original tree. Retrieve the entity on which semantic info
2349 -- actually appears.
2351 if Unit_Kind in N_Generic_Declaration then
2352 E_Name := Defining_Entity (U);
2354 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2355 -- the case of an instantiation, semantic analysis above will have
2356 -- replaced the unit by its instantiated version. If the instance body
2357 -- has been generated, the instance now denotes the body entity. For
2358 -- visibility purposes we need the entity of its spec.
2360 elsif (Unit_Kind = N_Package_Instantiation
2361 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2362 N_Package_Instantiation)
2363 and then Nkind (U) = N_Package_Body
2365 E_Name := Corresponding_Spec (U);
2367 elsif Unit_Kind = N_Package_Instantiation
2368 and then Nkind (U) = N_Package_Instantiation
2370 -- If the instance has not been rewritten as a package declaration,
2371 -- then it appeared already in a previous with clause. Retrieve
2372 -- the entity from the previous instance.
2374 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2376 elsif Unit_Kind in N_Subprogram_Instantiation then
2378 -- The visible subprogram is created during instantiation, and is
2379 -- an attribute of the wrapper package. We retrieve the wrapper
2380 -- package directly from the instantiation node. If the instance
2381 -- is inlined the unit is still an instantiation. Otherwise it has
2382 -- been rewritten as the declaration of the wrapper itself.
2384 if Nkind (U) in N_Subprogram_Instantiation then
2387 (Defining_Entity (Specification (Instance_Spec (U))));
2389 E_Name := Related_Instance (Defining_Entity (U));
2392 elsif Unit_Kind = N_Package_Renaming_Declaration
2393 or else Unit_Kind in N_Generic_Renaming_Declaration
2395 E_Name := Defining_Entity (U);
2397 elsif Unit_Kind = N_Subprogram_Body
2398 and then Nkind (Name (N)) = N_Selected_Component
2399 and then not Acts_As_Spec (Library_Unit (N))
2401 -- For a child unit that has no spec, one has been created and
2402 -- analyzed. The entity required is that of the spec.
2404 E_Name := Corresponding_Spec (U);
2407 E_Name := Defining_Entity (U);
2410 if Nkind (Name (N)) = N_Selected_Component then
2412 -- Child unit in a with clause
2414 Change_Selected_Component_To_Expanded_Name (Name (N));
2417 -- Restore style checks and restrictions
2419 Style_Check := Save_Style_Check;
2420 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2422 -- Record the reference, but do NOT set the unit as referenced, we want
2423 -- to consider the unit as unreferenced if this is the only reference
2426 Set_Entity_With_Style_Check (Name (N), E_Name);
2427 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2429 -- Generate references and check No_Dependence restriction for parents
2431 if Is_Child_Unit (E_Name) then
2432 Pref := Prefix (Name (N));
2433 Par_Name := Scope (E_Name);
2434 while Nkind (Pref) = N_Selected_Component loop
2435 Change_Selected_Component_To_Expanded_Name (Pref);
2436 Set_Entity_With_Style_Check (Pref, Par_Name);
2438 Generate_Reference (Par_Name, Pref);
2439 Check_Restriction_No_Dependence (Pref, N);
2440 Pref := Prefix (Pref);
2442 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2443 -- is set to Standard_Standard, and no attempt should be made to
2444 -- further unwind scopes.
2446 if Par_Name /= Standard_Standard then
2447 Par_Name := Scope (Par_Name);
2451 if Present (Entity (Pref))
2452 and then not Analyzed (Parent (Parent (Entity (Pref))))
2454 -- If the entity is set without its unit being compiled, the
2455 -- original parent is a renaming, and Par_Name is the renamed
2456 -- entity. For visibility purposes, we need the original entity,
2457 -- which must be analyzed now because Load_Unit directly retrieves
2458 -- the renamed unit, and the renaming declaration itself has not
2461 Analyze (Parent (Parent (Entity (Pref))));
2462 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2463 Par_Name := Entity (Pref);
2466 Set_Entity_With_Style_Check (Pref, Par_Name);
2467 Generate_Reference (Par_Name, Pref);
2470 -- If the withed unit is System, and a system extension pragma is
2471 -- present, compile the extension now, rather than waiting for a
2472 -- visibility check on a specific entity.
2474 if Chars (E_Name) = Name_System
2475 and then Scope (E_Name) = Standard_Standard
2476 and then Present (System_Extend_Unit)
2477 and then Present_System_Aux (N)
2479 -- If the extension is not present, an error will have been emitted
2484 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2485 -- to private_with units; they will be made visible later (just before
2486 -- the private part is analyzed)
2488 if Private_Present (N) then
2489 Set_Is_Immediately_Visible (E_Name, False);
2491 end Analyze_With_Clause;
2493 ------------------------------
2494 -- Check_Private_Child_Unit --
2495 ------------------------------
2497 procedure Check_Private_Child_Unit (N : Node_Id) is
2498 Lib_Unit : constant Node_Id := Unit (N);
2500 Curr_Unit : Entity_Id;
2501 Sub_Parent : Node_Id;
2502 Priv_Child : Entity_Id;
2503 Par_Lib : Entity_Id;
2506 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2507 -- Returns true if and only if the library unit is declared with
2508 -- an explicit designation of private.
2510 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2511 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2514 return Private_Present (Comp_Unit);
2515 end Is_Private_Library_Unit;
2517 -- Start of processing for Check_Private_Child_Unit
2520 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2521 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2522 Par_Lib := Curr_Unit;
2524 elsif Nkind (Lib_Unit) = N_Subunit then
2526 -- The parent is itself a body. The parent entity is to be found in
2527 -- the corresponding spec.
2529 Sub_Parent := Library_Unit (N);
2530 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2532 -- If the parent itself is a subunit, Curr_Unit is the entity
2533 -- of the enclosing body, retrieve the spec entity which is
2534 -- the proper ancestor we need for the following tests.
2536 if Ekind (Curr_Unit) = E_Package_Body then
2537 Curr_Unit := Spec_Entity (Curr_Unit);
2540 Par_Lib := Curr_Unit;
2543 Curr_Unit := Defining_Entity (Lib_Unit);
2545 Par_Lib := Curr_Unit;
2546 Par_Spec := Parent_Spec (Lib_Unit);
2548 if No (Par_Spec) then
2551 Par_Lib := Defining_Entity (Unit (Par_Spec));
2555 -- Loop through context items
2557 Item := First (Context_Items (N));
2558 while Present (Item) loop
2560 -- Ada 2005 (AI-262): Allow private_with of a private child package
2561 -- in public siblings
2563 if Nkind (Item) = N_With_Clause
2564 and then not Implicit_With (Item)
2565 and then not Limited_Present (Item)
2566 and then Is_Private_Descendant (Entity (Name (Item)))
2568 Priv_Child := Entity (Name (Item));
2571 Curr_Parent : Entity_Id := Par_Lib;
2572 Child_Parent : Entity_Id := Scope (Priv_Child);
2573 Prv_Ancestor : Entity_Id := Child_Parent;
2574 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2577 -- If the child unit is a public child then locate the nearest
2578 -- private ancestor. Child_Parent will then be set to the
2579 -- parent of that ancestor.
2581 if not Is_Private_Library_Unit (Priv_Child) then
2582 while Present (Prv_Ancestor)
2583 and then not Is_Private_Library_Unit (Prv_Ancestor)
2585 Prv_Ancestor := Scope (Prv_Ancestor);
2588 if Present (Prv_Ancestor) then
2589 Child_Parent := Scope (Prv_Ancestor);
2593 while Present (Curr_Parent)
2594 and then Curr_Parent /= Standard_Standard
2595 and then Curr_Parent /= Child_Parent
2598 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2599 Curr_Parent := Scope (Curr_Parent);
2602 if No (Curr_Parent) then
2603 Curr_Parent := Standard_Standard;
2606 if Curr_Parent /= Child_Parent then
2607 if Ekind (Priv_Child) = E_Generic_Package
2608 and then Chars (Priv_Child) in Text_IO_Package_Name
2609 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2612 ("& is a nested package, not a compilation unit",
2613 Name (Item), Priv_Child);
2617 ("unit in with clause is private child unit!", Item);
2619 ("\current unit must also have parent&!",
2620 Item, Child_Parent);
2624 or else Private_Present (Item)
2625 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2626 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2627 and then not Acts_As_Spec (Parent (Lib_Unit)))
2633 ("current unit must also be private descendant of&",
2634 Item, Child_Parent);
2642 end Check_Private_Child_Unit;
2644 ----------------------
2645 -- Check_Stub_Level --
2646 ----------------------
2648 procedure Check_Stub_Level (N : Node_Id) is
2649 Par : constant Node_Id := Parent (N);
2650 Kind : constant Node_Kind := Nkind (Par);
2653 if Nkind_In (Kind, N_Package_Body,
2657 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2661 -- In an instance, a missing stub appears at any level. A warning
2662 -- message will have been emitted already for the missing file.
2664 elsif not In_Instance then
2665 Error_Msg_N ("stub cannot appear in an inner scope", N);
2667 elsif Expander_Active then
2668 Error_Msg_N ("missing proper body", N);
2670 end Check_Stub_Level;
2672 ------------------------
2673 -- Expand_With_Clause --
2674 ------------------------
2676 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2677 Loc : constant Source_Ptr := Sloc (Nam);
2678 Ent : constant Entity_Id := Entity (Nam);
2682 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2683 -- Build name to be used in implicit with_clause. In most cases this
2684 -- is the source name, but if renamings are present we must make the
2685 -- original unit visible, not the one it renames. The entity in the
2686 -- with clause is the renamed unit, but the identifier is the one from
2687 -- the source, which allows us to recover the unit renaming.
2689 ---------------------
2690 -- Build_Unit_Name --
2691 ---------------------
2693 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2695 Renaming : Entity_Id;
2699 if Nkind (Nam) = N_Identifier then
2701 -- If the parent unit P in the name of the with_clause for P.Q
2702 -- is a renaming of package R, then the entity of the parent is
2703 -- set to R, but the identifier retains Chars (P) to be consistent
2704 -- with the source (see details in lib-load). However, the
2705 -- implicit_with_clause for the parent must make the entity for
2706 -- P visible, because P.Q may be used as a prefix within the
2707 -- current unit. The entity for P is the current_entity with that
2708 -- name, because the package renaming declaration for it has just
2709 -- been analyzed. Note that this case can only happen if P.Q has
2710 -- already appeared in a previous with_clause in a related unit,
2711 -- such as the library body of the current unit.
2713 if Chars (Nam) /= Chars (Entity (Nam)) then
2714 Renaming := Current_Entity (Nam);
2715 pragma Assert (Renamed_Entity (Renaming) = Entity (Nam));
2716 return New_Occurrence_Of (Renaming, Loc);
2719 return New_Occurrence_Of (Entity (Nam), Loc);
2723 Ent := Entity (Nam);
2725 if Present (Entity (Selector_Name (Nam)))
2726 and then Chars (Entity (Selector_Name (Nam))) /= Chars (Ent)
2728 Nkind (Unit_Declaration_Node (Entity (Selector_Name (Nam))))
2729 = N_Package_Renaming_Declaration
2731 -- The name in the with_clause is of the form A.B.C, and B
2732 -- is given by a renaming declaration. In that case we may
2733 -- not have analyzed the unit for B, but replaced it directly
2734 -- in lib-load with the unit it renames. We have to make A.B
2735 -- visible, so analyze the declaration for B now, in case it
2736 -- has not been done yet.
2738 Ent := Entity (Selector_Name (Nam));
2741 (Unit_Declaration_Node (Entity (Selector_Name (Nam)))));
2745 Make_Expanded_Name (Loc,
2746 Chars => Chars (Entity (Nam)),
2747 Prefix => Build_Unit_Name (Prefix (Nam)),
2748 Selector_Name => New_Occurrence_Of (Ent, Loc));
2749 Set_Entity (Result, Ent);
2752 end Build_Unit_Name;
2754 -- Start of processing for Expand_With_Clause
2757 New_Nodes_OK := New_Nodes_OK + 1;
2759 Make_With_Clause (Loc,
2760 Name => Build_Unit_Name (Nam));
2762 P := Parent (Unit_Declaration_Node (Ent));
2763 Set_Library_Unit (Withn, P);
2764 Set_Corresponding_Spec (Withn, Ent);
2765 Set_First_Name (Withn, True);
2766 Set_Implicit_With (Withn, True);
2768 -- If the unit is a package declaration, a private_with_clause on a
2769 -- child unit implies that the implicit with on the parent is also
2772 if Nkind (Unit (N)) = N_Package_Declaration then
2773 Set_Private_Present (Withn, Private_Present (Item));
2776 Prepend (Withn, Context_Items (N));
2777 Mark_Rewrite_Insertion (Withn);
2778 Install_Withed_Unit (Withn);
2780 if Nkind (Nam) = N_Expanded_Name then
2781 Expand_With_Clause (Item, Prefix (Nam), N);
2784 New_Nodes_OK := New_Nodes_OK - 1;
2785 end Expand_With_Clause;
2787 -----------------------
2788 -- Get_Parent_Entity --
2789 -----------------------
2791 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2793 if Nkind (Unit) = N_Package_Body
2794 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2796 return Defining_Entity
2797 (Specification (Instance_Spec (Original_Node (Unit))));
2798 elsif Nkind (Unit) = N_Package_Instantiation then
2799 return Defining_Entity (Specification (Instance_Spec (Unit)));
2801 return Defining_Entity (Unit);
2803 end Get_Parent_Entity;
2805 -----------------------------
2806 -- Implicit_With_On_Parent --
2807 -----------------------------
2809 procedure Implicit_With_On_Parent
2810 (Child_Unit : Node_Id;
2813 Loc : constant Source_Ptr := Sloc (N);
2814 P : constant Node_Id := Parent_Spec (Child_Unit);
2815 P_Unit : Node_Id := Unit (P);
2816 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
2819 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
2820 -- Build prefix of child unit name. Recurse if needed
2822 function Build_Unit_Name return Node_Id;
2823 -- If the unit is a child unit, build qualified name with all ancestors
2825 -------------------------
2826 -- Build_Ancestor_Name --
2827 -------------------------
2829 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
2830 P_Ref : constant Node_Id :=
2831 New_Reference_To (Defining_Entity (P), Loc);
2832 P_Spec : Node_Id := P;
2835 -- Ancestor may have been rewritten as a package body. Retrieve
2836 -- the original spec to trace earlier ancestors.
2838 if Nkind (P) = N_Package_Body
2839 and then Nkind (Original_Node (P)) = N_Package_Instantiation
2841 P_Spec := Original_Node (P);
2844 if No (Parent_Spec (P_Spec)) then
2848 Make_Selected_Component (Loc,
2849 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
2850 Selector_Name => P_Ref);
2852 end Build_Ancestor_Name;
2854 ---------------------
2855 -- Build_Unit_Name --
2856 ---------------------
2858 function Build_Unit_Name return Node_Id is
2861 if No (Parent_Spec (P_Unit)) then
2862 return New_Reference_To (P_Name, Loc);
2865 Make_Expanded_Name (Loc,
2866 Chars => Chars (P_Name),
2867 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
2868 Selector_Name => New_Reference_To (P_Name, Loc));
2869 Set_Entity (Result, P_Name);
2872 end Build_Unit_Name;
2874 -- Start of processing for Implicit_With_On_Parent
2877 -- The unit of the current compilation may be a package body that
2878 -- replaces an instance node. In this case we need the original instance
2879 -- node to construct the proper parent name.
2881 if Nkind (P_Unit) = N_Package_Body
2882 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
2884 P_Unit := Original_Node (P_Unit);
2887 -- We add the implicit with if the child unit is the current unit being
2888 -- compiled. If the current unit is a body, we do not want to add an
2889 -- implicit_with a second time to the corresponding spec.
2891 if Nkind (Child_Unit) = N_Package_Declaration
2892 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
2897 New_Nodes_OK := New_Nodes_OK + 1;
2898 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
2900 Set_Library_Unit (Withn, P);
2901 Set_Corresponding_Spec (Withn, P_Name);
2902 Set_First_Name (Withn, True);
2903 Set_Implicit_With (Withn, True);
2905 -- Node is placed at the beginning of the context items, so that
2906 -- subsequent use clauses on the parent can be validated.
2908 Prepend (Withn, Context_Items (N));
2909 Mark_Rewrite_Insertion (Withn);
2910 Install_Withed_Unit (Withn);
2912 if Is_Child_Spec (P_Unit) then
2913 Implicit_With_On_Parent (P_Unit, N);
2916 New_Nodes_OK := New_Nodes_OK - 1;
2917 end Implicit_With_On_Parent;
2923 function In_Chain (E : Entity_Id) return Boolean is
2927 H := Current_Entity (E);
2928 while Present (H) loop
2939 ---------------------
2940 -- Install_Context --
2941 ---------------------
2943 procedure Install_Context (N : Node_Id) is
2944 Lib_Unit : constant Node_Id := Unit (N);
2947 Install_Context_Clauses (N);
2949 if Is_Child_Spec (Lib_Unit) then
2950 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
2953 Install_Limited_Context_Clauses (N);
2954 end Install_Context;
2956 -----------------------------
2957 -- Install_Context_Clauses --
2958 -----------------------------
2960 procedure Install_Context_Clauses (N : Node_Id) is
2961 Lib_Unit : constant Node_Id := Unit (N);
2963 Uname_Node : Entity_Id;
2964 Check_Private : Boolean := False;
2965 Decl_Node : Node_Id;
2966 Lib_Parent : Entity_Id;
2969 -- First skip configuration pragmas at the start of the context. They
2970 -- are not technically part of the context clause, but that's where the
2971 -- parser puts them. Note they were analyzed in Analyze_Context.
2973 Item := First (Context_Items (N));
2974 while Present (Item)
2975 and then Nkind (Item) = N_Pragma
2976 and then Pragma_Name (Item) in Configuration_Pragma_Names
2981 -- Loop through the actual context clause items. We process everything
2982 -- except Limited_With clauses in this routine. Limited_With clauses
2983 -- are separately installed (see Install_Limited_Context_Clauses).
2985 while Present (Item) loop
2987 -- Case of explicit WITH clause
2989 if Nkind (Item) = N_With_Clause
2990 and then not Implicit_With (Item)
2992 if Limited_Present (Item) then
2994 -- Limited withed units will be installed later
2998 -- If Name (Item) is not an entity name, something is wrong, and
2999 -- this will be detected in due course, for now ignore the item
3001 elsif not Is_Entity_Name (Name (Item)) then
3004 elsif No (Entity (Name (Item))) then
3005 Set_Entity (Name (Item), Any_Id);
3009 Uname_Node := Entity (Name (Item));
3011 if Is_Private_Descendant (Uname_Node) then
3012 Check_Private := True;
3015 Install_Withed_Unit (Item);
3017 Decl_Node := Unit_Declaration_Node (Uname_Node);
3019 -- If the unit is a subprogram instance, it appears nested within
3020 -- a package that carries the parent information.
3022 if Is_Generic_Instance (Uname_Node)
3023 and then Ekind (Uname_Node) /= E_Package
3025 Decl_Node := Parent (Parent (Decl_Node));
3028 if Is_Child_Spec (Decl_Node) then
3029 if Nkind (Name (Item)) = N_Expanded_Name then
3030 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3032 -- If not an expanded name, the child unit must be a
3033 -- renaming, nothing to do.
3038 elsif Nkind (Decl_Node) = N_Subprogram_Body
3039 and then not Acts_As_Spec (Parent (Decl_Node))
3040 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3042 Implicit_With_On_Parent
3043 (Unit (Library_Unit (Parent (Decl_Node))), N);
3046 -- Check license conditions unless this is a dummy unit
3048 if Sloc (Library_Unit (Item)) /= No_Location then
3049 License_Check : declare
3051 Withu : constant Unit_Number_Type :=
3052 Get_Source_Unit (Library_Unit (Item));
3054 Withl : constant License_Type :=
3055 License (Source_Index (Withu));
3057 Unitl : constant License_Type :=
3058 License (Source_Index (Current_Sem_Unit));
3060 procedure License_Error;
3061 -- Signal error of bad license
3067 procedure License_Error is
3070 ("?license of with'ed unit & may be inconsistent",
3074 -- Start of processing for License_Check
3077 -- Exclude license check if withed unit is an internal unit.
3078 -- This situation arises e.g. with the GPL version of GNAT.
3080 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3083 -- Otherwise check various cases
3095 if Withl = Restricted then
3099 when Modified_GPL =>
3100 if Withl = Restricted or else Withl = GPL then
3104 when Unrestricted =>
3111 -- Case of USE PACKAGE clause
3113 elsif Nkind (Item) = N_Use_Package_Clause then
3114 Analyze_Use_Package (Item);
3116 -- Case of USE TYPE clause
3118 elsif Nkind (Item) = N_Use_Type_Clause then
3119 Analyze_Use_Type (Item);
3123 elsif Nkind (Item) = N_Pragma then
3131 if Is_Child_Spec (Lib_Unit) then
3133 -- The unit also has implicit with_clauses on its own parents
3135 if No (Context_Items (N)) then
3136 Set_Context_Items (N, New_List);
3139 Implicit_With_On_Parent (Lib_Unit, N);
3142 -- If the unit is a body, the context of the specification must also
3145 if Nkind (Lib_Unit) = N_Package_Body
3146 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3147 and then not Acts_As_Spec (N))
3149 Install_Context (Library_Unit (N));
3151 if Is_Child_Spec (Unit (Library_Unit (N))) then
3153 -- If the unit is the body of a public child unit, the private
3154 -- declarations of the parent must be made visible. If the child
3155 -- unit is private, the private declarations have been installed
3156 -- already in the call to Install_Parents for the spec. Installing
3157 -- private declarations must be done for all ancestors of public
3158 -- child units. In addition, sibling units mentioned in the
3159 -- context clause of the body are directly visible.
3167 Lib_Spec := Unit (Library_Unit (N));
3168 while Is_Child_Spec (Lib_Spec) loop
3169 P := Unit (Parent_Spec (Lib_Spec));
3170 P_Name := Defining_Entity (P);
3172 if not (Private_Present (Parent (Lib_Spec)))
3173 and then not In_Private_Part (P_Name)
3175 Install_Private_Declarations (P_Name);
3176 Install_Private_With_Clauses (P_Name);
3177 Set_Use (Private_Declarations (Specification (P)));
3185 -- For a package body, children in context are immediately visible
3187 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3190 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3191 N_Generic_Subprogram_Declaration,
3192 N_Package_Declaration,
3193 N_Subprogram_Declaration)
3195 if Is_Child_Spec (Lib_Unit) then
3196 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3197 Set_Is_Private_Descendant
3198 (Defining_Entity (Lib_Unit),
3199 Is_Private_Descendant (Lib_Parent)
3200 or else Private_Present (Parent (Lib_Unit)));
3203 Set_Is_Private_Descendant
3204 (Defining_Entity (Lib_Unit),
3205 Private_Present (Parent (Lib_Unit)));
3209 if Check_Private then
3210 Check_Private_Child_Unit (N);
3212 end Install_Context_Clauses;
3214 -------------------------------------
3215 -- Install_Limited_Context_Clauses --
3216 -------------------------------------
3218 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3221 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3222 -- Check that the unlimited view of a given compilation_unit is not
3223 -- already visible through "use + renamings".
3225 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3226 -- Check that if a limited_with clause of a given compilation_unit
3227 -- mentions a descendant of a private child of some library unit,
3228 -- then the given compilation_unit shall be the declaration of a
3229 -- private descendant of that library unit, or a public descendant
3230 -- of such. The code is analogous to that of Check_Private_Child_Unit
3231 -- but we cannot use entities on the limited with_clauses because
3232 -- their units have not been analyzed, so we have to climb the tree
3233 -- of ancestors looking for private keywords.
3235 procedure Expand_Limited_With_Clause
3236 (Comp_Unit : Node_Id;
3239 -- If a child unit appears in a limited_with clause, there are implicit
3240 -- limited_with clauses on all parents that are not already visible
3241 -- through a regular with clause. This procedure creates the implicit
3242 -- limited with_clauses for the parents and loads the corresponding
3243 -- units. The shadow entities are created when the inserted clause is
3244 -- analyzed. Implements Ada 2005 (AI-50217).
3246 ---------------------
3247 -- Check_Renamings --
3248 ---------------------
3250 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3259 pragma Assert (Nkind (W) = N_With_Clause);
3261 -- Protect the frontend against previous critical errors
3263 case Nkind (Unit (Library_Unit (W))) is
3264 when N_Subprogram_Declaration |
3265 N_Package_Declaration |
3266 N_Generic_Subprogram_Declaration |
3267 N_Generic_Package_Declaration =>
3274 -- Check "use + renamings"
3276 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3277 Spec := Specification (Unit (P));
3279 Item := First (Visible_Declarations (Spec));
3280 while Present (Item) loop
3282 -- Look only at use package clauses
3284 if Nkind (Item) = N_Use_Package_Clause then
3286 -- Traverse the list of packages
3288 Nam := First (Names (Item));
3289 while Present (Nam) loop
3292 pragma Assert (Present (Parent (E)));
3294 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3295 and then Renamed_Entity (E) = WEnt
3297 -- The unlimited view is visible through use clause and
3298 -- renamings. There is no need to generate the error
3299 -- message here because Is_Visible_Through_Renamings
3300 -- takes care of generating the precise error message.
3304 elsif Nkind (Parent (E)) = N_Package_Specification then
3306 -- The use clause may refer to a local package.
3307 -- Check all the enclosing scopes.
3310 while E2 /= Standard_Standard
3318 ("unlimited view visible through use clause ", W);
3330 -- Recursive call to check all the ancestors
3332 if Is_Child_Spec (Unit (P)) then
3333 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3335 end Check_Renamings;
3337 ---------------------------------------
3338 -- Check_Private_Limited_Withed_Unit --
3339 ---------------------------------------
3341 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3342 Curr_Parent : Node_Id;
3343 Child_Parent : Node_Id;
3344 Curr_Private : Boolean;
3347 -- Compilation unit of the parent of the withed library unit
3349 Child_Parent := Library_Unit (Item);
3351 -- If the child unit is a public child, then locate its nearest
3352 -- private ancestor, if any; Child_Parent will then be set to
3353 -- the parent of that ancestor.
3355 if not Private_Present (Library_Unit (Item)) then
3356 while Present (Child_Parent)
3357 and then not Private_Present (Child_Parent)
3359 Child_Parent := Parent_Spec (Unit (Child_Parent));
3362 if No (Child_Parent) then
3367 Child_Parent := Parent_Spec (Unit (Child_Parent));
3369 -- Traverse all the ancestors of the current compilation
3370 -- unit to check if it is a descendant of named library unit.
3372 Curr_Parent := Parent (Item);
3373 Curr_Private := Private_Present (Curr_Parent);
3375 while Present (Parent_Spec (Unit (Curr_Parent)))
3376 and then Curr_Parent /= Child_Parent
3378 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3379 Curr_Private := Curr_Private or else Private_Present (Curr_Parent);
3382 if Curr_Parent /= Child_Parent then
3384 ("unit in with clause is private child unit!", Item);
3386 ("\current unit must also have parent&!",
3387 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3389 elsif Private_Present (Parent (Item))
3390 or else Curr_Private
3391 or else Private_Present (Item)
3392 or else Nkind_In (Unit (Parent (Item)), N_Package_Body,
3396 -- Current unit is private, of descendant of a private unit
3402 ("current unit must also be private descendant of&",
3403 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3405 end Check_Private_Limited_Withed_Unit;
3407 --------------------------------
3408 -- Expand_Limited_With_Clause --
3409 --------------------------------
3411 procedure Expand_Limited_With_Clause
3412 (Comp_Unit : Node_Id;
3416 Loc : constant Source_Ptr := Sloc (Nam);
3417 Unum : Unit_Number_Type;
3420 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3421 -- Returns true if the context already includes a with_clause for
3422 -- this unit. If the with_clause is non-limited, the unit is fully
3423 -- visible and an implicit limited_with should not be created. If
3424 -- there is already a limited_with clause for W, a second one is
3425 -- simply redundant.
3427 --------------------------
3428 -- Previous_Withed_Unit --
3429 --------------------------
3431 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3435 -- A limited with_clause cannot appear in the same context_clause
3436 -- as a nonlimited with_clause which mentions the same library.
3438 Item := First (Context_Items (Comp_Unit));
3439 while Present (Item) loop
3440 if Nkind (Item) = N_With_Clause
3441 and then Library_Unit (Item) = Library_Unit (W)
3450 end Previous_Withed_Unit;
3452 -- Start of processing for Expand_Limited_With_Clause
3455 New_Nodes_OK := New_Nodes_OK + 1;
3457 if Nkind (Nam) = N_Identifier then
3459 -- Create node for name of withed unit
3462 Make_With_Clause (Loc,
3463 Name => New_Copy (Nam));
3465 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3467 Make_With_Clause (Loc,
3468 Name => Make_Selected_Component (Loc,
3469 Prefix => New_Copy_Tree (Prefix (Nam)),
3470 Selector_Name => New_Copy (Selector_Name (Nam))));
3471 Set_Parent (Withn, Parent (N));
3474 Set_Limited_Present (Withn);
3475 Set_First_Name (Withn);
3476 Set_Implicit_With (Withn);
3480 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3485 -- Do not generate a limited_with_clause on the current unit.
3486 -- This path is taken when a unit has a limited_with clause on
3487 -- one of its child units.
3489 if Unum = Current_Sem_Unit then
3493 Set_Library_Unit (Withn, Cunit (Unum));
3494 Set_Corresponding_Spec
3495 (Withn, Specification (Unit (Cunit (Unum))));
3497 if not Previous_Withed_Unit (Withn) then
3498 Prepend (Withn, Context_Items (Parent (N)));
3499 Mark_Rewrite_Insertion (Withn);
3501 -- Add implicit limited_with_clauses for parents of child units
3502 -- mentioned in limited_with clauses.
3504 if Nkind (Nam) = N_Selected_Component then
3505 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3510 if not Limited_View_Installed (Withn) then
3511 Install_Limited_Withed_Unit (Withn);
3515 New_Nodes_OK := New_Nodes_OK - 1;
3516 end Expand_Limited_With_Clause;
3518 -- Start of processing for Install_Limited_Context_Clauses
3521 Item := First (Context_Items (N));
3522 while Present (Item) loop
3523 if Nkind (Item) = N_With_Clause
3524 and then Limited_Present (Item)
3526 if Nkind (Name (Item)) = N_Selected_Component then
3527 Expand_Limited_With_Clause
3528 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3531 Check_Private_Limited_Withed_Unit (Item);
3533 if not Implicit_With (Item)
3534 and then Is_Child_Spec (Unit (N))
3536 Check_Renamings (Parent_Spec (Unit (N)), Item);
3539 -- A unit may have a limited with on itself if it has a limited
3540 -- with_clause on one of its child units. In that case it is
3541 -- already being compiled and it makes no sense to install its
3544 -- If the item is a limited_private_with_clause, install it if the
3545 -- current unit is a body or if it is a private child. Otherwise
3546 -- the private clause is installed before analyzing the private
3547 -- part of the current unit.
3549 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3550 and then not Limited_View_Installed (Item)
3552 if not Private_Present (Item)
3553 or else Private_Present (N)
3554 or else Nkind_In (Unit (N), N_Package_Body,
3558 Install_Limited_Withed_Unit (Item);
3562 -- All items other than Limited_With clauses are ignored (they were
3563 -- installed separately early on by Install_Context_Clause).
3572 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3573 -- spec, looking for incomplete subtype declarations of incomplete
3574 -- types visible through a limited with clause.
3576 if Ada_Version >= Ada_05
3577 and then Analyzed (N)
3578 and then Nkind (Unit (N)) = N_Package_Declaration
3583 Non_Lim_View : Entity_Id;
3586 Decl := First (Visible_Declarations (Specification (Unit (N))));
3587 while Present (Decl) loop
3588 if Nkind (Decl) = N_Subtype_Declaration
3590 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3592 From_With_Type (Defining_Identifier (Decl))
3594 Def_Id := Defining_Identifier (Decl);
3595 Non_Lim_View := Non_Limited_View (Def_Id);
3597 if not Is_Incomplete_Type (Non_Lim_View) then
3599 -- Convert an incomplete subtype declaration into a
3600 -- corresponding non-limited view subtype declaration.
3601 -- This is usually the case when analyzing a body that
3602 -- has regular with-clauses, when the spec has limited
3605 -- If the non-limited view is still incomplete, it is
3606 -- the dummy entry already created, and the declaration
3607 -- cannot be reanalyzed. This is the case when installing
3608 -- a parent unit that has limited with-clauses.
3610 Set_Subtype_Indication (Decl,
3611 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3612 Set_Etype (Def_Id, Non_Lim_View);
3613 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3614 Set_Analyzed (Decl, False);
3616 -- Reanalyze the declaration, suppressing the call to
3617 -- Enter_Name to avoid duplicate names.
3619 Analyze_Subtype_Declaration
3629 end Install_Limited_Context_Clauses;
3631 ---------------------
3632 -- Install_Parents --
3633 ---------------------
3635 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3642 P := Unit (Parent_Spec (Lib_Unit));
3643 P_Name := Get_Parent_Entity (P);
3645 if Etype (P_Name) = Any_Type then
3649 if Ekind (P_Name) = E_Generic_Package
3650 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3651 N_Generic_Package_Declaration)
3652 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3655 ("child of a generic package must be a generic unit", Lib_Unit);
3657 elsif not Is_Package_Or_Generic_Package (P_Name) then
3659 ("parent unit must be package or generic package", Lib_Unit);
3660 raise Unrecoverable_Error;
3662 elsif Present (Renamed_Object (P_Name)) then
3663 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3664 raise Unrecoverable_Error;
3666 -- Verify that a child of an instance is itself an instance, or the
3667 -- renaming of one. Given that an instance that is a unit is replaced
3668 -- with a package declaration, check against the original node. The
3669 -- parent may be currently being instantiated, in which case it appears
3670 -- as a declaration, but the generic_parent is already established
3671 -- indicating that we deal with an instance.
3673 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3674 if Nkind (Lib_Unit) in N_Renaming_Declaration
3675 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3677 (Nkind (Lib_Unit) = N_Package_Declaration
3678 and then Present (Generic_Parent (Specification (Lib_Unit))))
3683 ("child of an instance must be an instance or renaming",
3688 -- This is the recursive call that ensures all parents are loaded
3690 if Is_Child_Spec (P) then
3692 Is_Private or else Private_Present (Parent (Lib_Unit)));
3695 -- Now we can install the context for this parent
3697 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3698 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3699 Install_Siblings (P_Name, Parent (Lib_Unit));
3701 -- The child unit is in the declarative region of the parent. The parent
3702 -- must therefore appear in the scope stack and be visible, as when
3703 -- compiling the corresponding body. If the child unit is private or it
3704 -- is a package body, private declarations must be accessible as well.
3705 -- Use declarations in the parent must also be installed. Finally, other
3706 -- child units of the same parent that are in the context are
3707 -- immediately visible.
3709 -- Find entity for compilation unit, and set its private descendant
3710 -- status as needed.
3712 E_Name := Defining_Entity (Lib_Unit);
3714 Set_Is_Child_Unit (E_Name);
3716 Set_Is_Private_Descendant (E_Name,
3717 Is_Private_Descendant (P_Name)
3718 or else Private_Present (Parent (Lib_Unit)));
3720 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3721 Push_Scope (P_Name);
3723 -- Save current visibility of unit
3725 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3726 Is_Immediately_Visible (P_Name);
3727 Set_Is_Immediately_Visible (P_Name);
3728 Install_Visible_Declarations (P_Name);
3729 Set_Use (Visible_Declarations (P_Spec));
3731 -- If the parent is a generic unit, its formal part may contain formal
3732 -- packages and use clauses for them.
3734 if Ekind (P_Name) = E_Generic_Package then
3735 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3739 or else Private_Present (Parent (Lib_Unit))
3741 Install_Private_Declarations (P_Name);
3742 Install_Private_With_Clauses (P_Name);
3743 Set_Use (Private_Declarations (P_Spec));
3745 end Install_Parents;
3747 ----------------------------------
3748 -- Install_Private_With_Clauses --
3749 ----------------------------------
3751 procedure Install_Private_With_Clauses (P : Entity_Id) is
3752 Decl : constant Node_Id := Unit_Declaration_Node (P);
3756 if Debug_Flag_I then
3757 Write_Str ("install private with clauses of ");
3758 Write_Name (Chars (P));
3762 if Nkind (Parent (Decl)) = N_Compilation_Unit then
3763 Item := First (Context_Items (Parent (Decl)));
3764 while Present (Item) loop
3765 if Nkind (Item) = N_With_Clause
3766 and then Private_Present (Item)
3768 if Limited_Present (Item) then
3769 if not Limited_View_Installed (Item) then
3770 Install_Limited_Withed_Unit (Item);
3773 Install_Withed_Unit (Item, Private_With_OK => True);
3780 end Install_Private_With_Clauses;
3782 ----------------------
3783 -- Install_Siblings --
3784 ----------------------
3786 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
3792 -- Iterate over explicit with clauses, and check whether the scope of
3793 -- each entity is an ancestor of the current unit, in which case it is
3794 -- immediately visible.
3796 Item := First (Context_Items (N));
3797 while Present (Item) loop
3799 -- Do not install private_with_clauses declaration, unless
3800 -- unit is itself a private child unit, or is a body.
3801 -- Note that for a subprogram body the private_with_clause does
3802 -- not take effect until after the specification.
3804 if Nkind (Item) /= N_With_Clause
3805 or else Implicit_With (Item)
3806 or else Limited_Present (Item)
3810 elsif not Private_Present (Item)
3811 or else Private_Present (N)
3812 or else Nkind (Unit (N)) = N_Package_Body
3814 Id := Entity (Name (Item));
3816 if Is_Child_Unit (Id)
3817 and then Is_Ancestor_Package (Scope (Id), U_Name)
3819 Set_Is_Immediately_Visible (Id);
3821 -- Check for the presence of another unit in the context,
3822 -- that may be inadvertently hidden by the child.
3824 Prev := Current_Entity (Id);
3827 and then Is_Immediately_Visible (Prev)
3828 and then not Is_Child_Unit (Prev)
3834 Clause := First (Context_Items (N));
3835 while Present (Clause) loop
3836 if Nkind (Clause) = N_With_Clause
3837 and then Entity (Name (Clause)) = Prev
3840 ("child unit& hides compilation unit " &
3841 "with the same name?",
3851 -- The With_Clause may be on a grand-child or one of its further
3852 -- descendants, which makes a child immediately visible. Examine
3853 -- ancestry to determine whether such a child exists. For example,
3854 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
3855 -- is immediately visible.
3857 elsif Is_Child_Unit (Id) then
3863 while Is_Child_Unit (Par) loop
3864 if Is_Ancestor_Package (Scope (Par), U_Name) then
3865 Set_Is_Immediately_Visible (Par);
3874 -- If the item is a private with-clause on a child unit, the parent
3875 -- may have been installed already, but the child unit must remain
3876 -- invisible until installed in a private part or body.
3878 elsif Private_Present (Item) then
3879 Id := Entity (Name (Item));
3881 if Is_Child_Unit (Id) then
3882 Set_Is_Visible_Child_Unit (Id, False);
3888 end Install_Siblings;
3890 ---------------------------------
3891 -- Install_Limited_Withed_Unit --
3892 ---------------------------------
3894 procedure Install_Limited_Withed_Unit (N : Node_Id) is
3895 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
3898 Is_Child_Package : Boolean := False;
3899 Lim_Header : Entity_Id;
3900 Lim_Typ : Entity_Id;
3902 procedure Check_Body_Required;
3903 -- A unit mentioned in a limited with_clause may not be mentioned in
3904 -- a regular with_clause, but must still be included in the current
3905 -- partition. We need to determine whether the unit needs a body, so
3906 -- that the binder can determine the name of the file to be compiled.
3907 -- Checking whether a unit needs a body can be done without semantic
3908 -- analysis, by examining the nature of the declarations in the package.
3910 function Has_Limited_With_Clause
3911 (C_Unit : Entity_Id;
3912 Pack : Entity_Id) return Boolean;
3913 -- Determine whether any package in the ancestor chain starting with
3914 -- C_Unit has a limited with clause for package Pack.
3916 function Has_With_Clause
3919 Is_Limited : Boolean := False) return Boolean;
3920 -- Determine whether compilation unit C_Unit contains a with clause
3921 -- for package Pack. Use flag Is_Limited to designate desired clause
3922 -- kind. This is a subsidiary routine to Has_Limited_With_Clause.
3924 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
3925 -- Check if some package installed though normal with-clauses has a
3926 -- renaming declaration of package P. AARM 10.1.2(21/2).
3928 -------------------------
3929 -- Check_Body_Required --
3930 -------------------------
3932 procedure Check_Body_Required is
3933 PA : constant List_Id :=
3934 Pragmas_After (Aux_Decls_Node (Parent (P_Unit)));
3936 procedure Check_Declarations (Spec : Node_Id);
3937 -- Recursive procedure that does the work and checks nested packages
3939 ------------------------
3940 -- Check_Declarations --
3941 ------------------------
3943 procedure Check_Declarations (Spec : Node_Id) is
3945 Incomplete_Decls : constant Elist_Id := New_Elmt_List;
3947 Subp_List : constant Elist_Id := New_Elmt_List;
3949 procedure Check_Pragma_Import (P : Node_Id);
3950 -- If a pragma import applies to a previous subprogram, the
3951 -- enclosing unit may not need a body. The processing is syntactic
3952 -- and does not require a declaration to be analyzed. The code
3953 -- below also handles pragma Import when applied to a subprogram
3954 -- that renames another. In this case the pragma applies to the
3957 -- Chains of multiple renames are not handled by the code below.
3958 -- It is probably impossible to handle all cases without proper
3959 -- name resolution. In such cases the algorithm is conservative
3960 -- and will indicate that a body is needed???
3962 -------------------------
3963 -- Check_Pragma_Import --
3964 -------------------------
3966 procedure Check_Pragma_Import (P : Node_Id) is
3972 procedure Remove_Homonyms (E : Node_Id);
3973 -- Make one pass over list of subprograms. Called again if
3974 -- subprogram is a renaming. E is known to be an identifier.
3976 ---------------------
3977 -- Remove_Homonyms --
3978 ---------------------
3980 procedure Remove_Homonyms (E : Node_Id) is
3981 R : Entity_Id := Empty;
3982 -- Name of renamed entity, if any
3985 Subp_Id := First_Elmt (Subp_List);
3986 while Present (Subp_Id) loop
3987 if Chars (Node (Subp_Id)) = Chars (E) then
3988 if Nkind (Parent (Parent (Node (Subp_Id))))
3989 /= N_Subprogram_Renaming_Declaration
3992 Next_Elmt (Subp_Id);
3993 Remove_Elmt (Subp_List, Prev_Id);
3995 R := Name (Parent (Parent (Node (Subp_Id))));
3999 Next_Elmt (Subp_Id);
4004 if Nkind (R) = N_Identifier then
4005 Remove_Homonyms (R);
4007 elsif Nkind (R) = N_Selected_Component then
4008 Remove_Homonyms (Selector_Name (R));
4010 -- Renaming of attribute
4016 end Remove_Homonyms;
4018 -- Start of processing for Check_Pragma_Import
4021 -- Find name of entity in Import pragma. We have not analyzed
4022 -- the construct, so we must guard against syntax errors.
4024 Arg := Next (First (Pragma_Argument_Associations (P)));
4027 or else Nkind (Expression (Arg)) /= N_Identifier
4031 Imported := Expression (Arg);
4034 Remove_Homonyms (Imported);
4035 end Check_Pragma_Import;
4037 -- Start of processing for Check_Declarations
4040 -- Search for Elaborate Body pragma
4042 Decl := First (Visible_Declarations (Spec));
4043 while Present (Decl)
4044 and then Nkind (Decl) = N_Pragma
4046 if Get_Pragma_Id (Decl) = Pragma_Elaborate_Body then
4047 Set_Body_Required (Library_Unit (N));
4054 -- Look for declarations that require the presence of a body
4056 while Present (Decl) loop
4058 -- Subprogram that comes from source means body may be needed.
4059 -- Save for subsequent examination of import pragmas.
4061 if Comes_From_Source (Decl)
4062 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4063 N_Subprogram_Renaming_Declaration,
4064 N_Generic_Subprogram_Declaration))
4066 Append_Elmt (Defining_Entity (Decl), Subp_List);
4068 -- Package declaration of generic package declaration. We need
4069 -- to recursively examine nested declarations.
4071 elsif Nkind_In (Decl, N_Package_Declaration,
4072 N_Generic_Package_Declaration)
4074 Check_Declarations (Specification (Decl));
4076 elsif Nkind (Decl) = N_Pragma
4077 and then Pragma_Name (Decl) = Name_Import
4079 Check_Pragma_Import (Decl);
4085 -- Same set of tests for private part. In addition to subprograms
4086 -- detect the presence of Taft Amendment types (incomplete types
4087 -- completed in the body).
4089 Decl := First (Private_Declarations (Spec));
4090 while Present (Decl) loop
4091 if Comes_From_Source (Decl)
4092 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4093 N_Subprogram_Renaming_Declaration,
4094 N_Generic_Subprogram_Declaration))
4096 Append_Elmt (Defining_Entity (Decl), Subp_List);
4098 elsif Nkind_In (Decl, N_Package_Declaration,
4099 N_Generic_Package_Declaration)
4101 Check_Declarations (Specification (Decl));
4103 -- Collect incomplete type declarations for separate pass
4105 elsif Nkind (Decl) = N_Incomplete_Type_Declaration then
4106 Append_Elmt (Decl, Incomplete_Decls);
4108 elsif Nkind (Decl) = N_Pragma
4109 and then Pragma_Name (Decl) = Name_Import
4111 Check_Pragma_Import (Decl);
4117 -- Now check incomplete declarations to locate Taft amendment
4118 -- types. This can be done by examining the defining identifiers
4119 -- of type declarations without real semantic analysis.
4125 Inc := First_Elmt (Incomplete_Decls);
4126 while Present (Inc) loop
4127 Decl := Next (Node (Inc));
4128 while Present (Decl) loop
4129 if Nkind (Decl) = N_Full_Type_Declaration
4130 and then Chars (Defining_Identifier (Decl)) =
4131 Chars (Defining_Identifier (Node (Inc)))
4139 -- If no completion, this is a TAT, and a body is needed
4142 Set_Body_Required (Library_Unit (N));
4150 -- Finally, check whether there are subprograms that still
4151 -- require a body, i.e. are not renamings or null.
4153 if not Is_Empty_Elmt_List (Subp_List) then
4159 Subp_Id := First_Elmt (Subp_List);
4160 Spec := Parent (Node (Subp_Id));
4162 while Present (Subp_Id) loop
4163 if Nkind (Parent (Spec))
4164 = N_Subprogram_Renaming_Declaration
4168 elsif Nkind (Spec) = N_Procedure_Specification
4169 and then Null_Present (Spec)
4174 Set_Body_Required (Library_Unit (N));
4178 Next_Elmt (Subp_Id);
4182 end Check_Declarations;
4184 -- Start of processing for Check_Body_Required
4187 -- If this is an imported package (Java and CIL usage) no body is
4188 -- needed. Scan list of pragmas that may follow a compilation unit
4189 -- to look for a relevant pragma Import.
4191 if Present (PA) then
4197 while Present (Prag) loop
4198 if Nkind (Prag) = N_Pragma
4199 and then Get_Pragma_Id (Prag) = Pragma_Import
4209 Check_Declarations (Specification (P_Unit));
4210 end Check_Body_Required;
4212 -----------------------------
4213 -- Has_Limited_With_Clause --
4214 -----------------------------
4216 function Has_Limited_With_Clause
4217 (C_Unit : Entity_Id;
4218 Pack : Entity_Id) return Boolean
4225 while Present (Par) loop
4226 if Ekind (Par) /= E_Package then
4230 -- Retrieve the Compilation_Unit node for Par and determine if
4231 -- its context clauses contain a limited with for Pack.
4233 Par_Unit := Parent (Parent (Parent (Par)));
4235 if Nkind (Par_Unit) = N_Package_Declaration then
4236 Par_Unit := Parent (Par_Unit);
4239 if Has_With_Clause (Par_Unit, Pack, True) then
4243 -- If there are more ancestors, climb up the tree, otherwise
4246 if Is_Child_Unit (Par) then
4254 end Has_Limited_With_Clause;
4256 ---------------------
4257 -- Has_With_Clause --
4258 ---------------------
4260 function Has_With_Clause
4263 Is_Limited : Boolean := False) return Boolean
4269 if Present (Context_Items (C_Unit)) then
4270 Item := First (Context_Items (C_Unit));
4271 while Present (Item) loop
4272 if Nkind (Item) = N_With_Clause then
4274 -- Retrieve the entity of the imported compilation unit
4276 if Nkind (Name (Item)) = N_Selected_Component then
4277 Nam := Entity (Selector_Name (Name (Item)));
4279 Nam := Entity (Name (Item));
4284 ((Is_Limited and then Limited_Present (Item))
4286 (not Is_Limited and then not Limited_Present (Item)))
4297 end Has_With_Clause;
4299 ----------------------------------
4300 -- Is_Visible_Through_Renamings --
4301 ----------------------------------
4303 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4304 Kind : constant Node_Kind :=
4305 Nkind (Unit (Cunit (Current_Sem_Unit)));
4311 -- Example of the error detected by this subprogram:
4319 -- package Ren_P renames P;
4325 -- limited with P; -- ERROR
4326 -- package R.C is ...
4328 Aux_Unit := Cunit (Current_Sem_Unit);
4331 Item := First (Context_Items (Aux_Unit));
4332 while Present (Item) loop
4333 if Nkind (Item) = N_With_Clause
4334 and then not Limited_Present (Item)
4335 and then Nkind (Unit (Library_Unit (Item))) =
4336 N_Package_Declaration
4339 First (Visible_Declarations
4340 (Specification (Unit (Library_Unit (Item)))));
4341 while Present (Decl) loop
4342 if Nkind (Decl) = N_Package_Renaming_Declaration
4343 and then Entity (Name (Decl)) = P
4345 -- Generate the error message only if the current unit
4346 -- is a package declaration; in case of subprogram
4347 -- bodies and package bodies we just return True to
4348 -- indicate that the limited view must not be
4351 if Kind = N_Package_Declaration then
4353 ("simultaneous visibility of the limited and " &
4354 "unlimited views not allowed", N);
4355 Error_Msg_Sloc := Sloc (Item);
4357 ("\\ unlimited view of & visible through the " &
4358 "context clause #", N, P);
4359 Error_Msg_Sloc := Sloc (Decl);
4360 Error_Msg_NE ("\\ and the renaming #", N, P);
4373 -- If it's a body not acting as spec, follow pointer to
4374 -- corresponding spec, otherwise follow pointer to parent spec.
4376 if Present (Library_Unit (Aux_Unit))
4377 and then Nkind_In (Unit (Aux_Unit),
4378 N_Package_Body, N_Subprogram_Body)
4380 if Aux_Unit = Library_Unit (Aux_Unit) then
4382 -- Aux_Unit is a body that acts as a spec. Clause has
4383 -- already been flagged as illegal.
4388 Aux_Unit := Library_Unit (Aux_Unit);
4392 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4395 exit when No (Aux_Unit);
4399 end Is_Visible_Through_Renamings;
4401 -- Start of processing for Install_Limited_Withed_Unit
4404 pragma Assert (not Limited_View_Installed (N));
4406 -- In case of limited with_clause on subprograms, generics, instances,
4407 -- or renamings, the corresponding error was previously posted and we
4408 -- have nothing to do here. If the file is missing altogether, it has
4409 -- no source location.
4411 if Nkind (P_Unit) /= N_Package_Declaration
4412 or else Sloc (P_Unit) = No_Location
4417 P := Defining_Unit_Name (Specification (P_Unit));
4419 -- Handle child packages
4421 if Nkind (P) = N_Defining_Program_Unit_Name then
4422 Is_Child_Package := True;
4423 P := Defining_Identifier (P);
4426 -- Do not install the limited-view if the full-view is already visible
4427 -- through renaming declarations.
4429 if Is_Visible_Through_Renamings (P) then
4433 -- Do not install the limited view if this is the unit being analyzed.
4434 -- This unusual case will happen when a unit has a limited_with clause
4435 -- on one of its children. The compilation of the child forces the
4436 -- load of the parent which tries to install the limited view of the
4437 -- child again. Installing the limited view must also be disabled
4438 -- when compiling the body of the child unit.
4440 if P = Cunit_Entity (Current_Sem_Unit)
4442 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4443 and then P = Main_Unit_Entity)
4448 -- This scenario is similar to the one above, the difference is that
4449 -- the compilation of sibling Par.Sib forces the load of parent Par
4450 -- which tries to install the limited view of Lim_Pack [1]. However
4451 -- Par.Sib has a with clause for Lim_Pack [2] in its body, and thus
4452 -- needs the non-limited views of all entities from Lim_Pack.
4454 -- limited with Lim_Pack; -- [1]
4455 -- package Par is ... package Lim_Pack is ...
4457 -- with Lim_Pack; -- [2]
4458 -- package Par.Sib is ... package body Par.Sib is ...
4460 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4461 -- Sem_Unit is the body of Par.Sib.
4463 if Ekind (P) = E_Package
4464 and then Ekind (Main_Unit_Entity) = E_Package
4465 and then Is_Child_Unit (Main_Unit_Entity)
4467 -- The body has a regular with clause
4469 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4470 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4472 -- One of the ancestors has a limited with clause
4474 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4475 N_Package_Specification
4476 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4481 -- A common use of the limited-with is to have a limited-with
4482 -- in the package spec, and a normal with in its package body.
4485 -- limited with X; -- [1]
4489 -- package body A is ...
4491 -- The compilation of A's body installs the context clauses found at [2]
4492 -- and then the context clauses of its specification (found at [1]). As
4493 -- a consequence, at [1] the specification of X has been analyzed and it
4494 -- is immediately visible. According to the semantics of limited-with
4495 -- context clauses we don't install the limited view because the full
4496 -- view of X supersedes its limited view.
4498 if Analyzed (P_Unit)
4500 (Is_Immediately_Visible (P)
4502 (Is_Child_Package and then Is_Visible_Child_Unit (P)))
4507 if Debug_Flag_I then
4508 Write_Str ("install limited view of ");
4509 Write_Name (Chars (P));
4513 -- If the unit has not been analyzed and the limited view has not been
4514 -- already installed then we install it.
4516 if not Analyzed (P_Unit) then
4517 if not In_Chain (P) then
4519 -- Minimum decoration
4521 Set_Ekind (P, E_Package);
4522 Set_Etype (P, Standard_Void_Type);
4523 Set_Scope (P, Standard_Standard);
4525 if Is_Child_Package then
4526 Set_Is_Child_Unit (P);
4527 Set_Is_Visible_Child_Unit (P);
4528 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4531 -- Place entity on visibility structure
4533 Set_Homonym (P, Current_Entity (P));
4534 Set_Current_Entity (P);
4536 if Debug_Flag_I then
4537 Write_Str (" (homonym) chain ");
4538 Write_Name (Chars (P));
4542 -- Install the incomplete view. The first element of the limited
4543 -- view is a header (an E_Package entity) used to reference the
4544 -- first shadow entity in the private part of the package.
4546 Lim_Header := Limited_View (P);
4547 Lim_Typ := First_Entity (Lim_Header);
4549 while Present (Lim_Typ)
4550 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4552 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4553 Set_Current_Entity (Lim_Typ);
4555 if Debug_Flag_I then
4556 Write_Str (" (homonym) chain ");
4557 Write_Name (Chars (Lim_Typ));
4561 Next_Entity (Lim_Typ);
4565 -- If the unit appears in a previous regular with_clause, the regular
4566 -- entities of the public part of the withed package must be replaced
4567 -- by the shadow ones.
4569 -- This code must be kept synchronized with the code that replaces the
4570 -- shadow entities by the real entities (see body of Remove_Limited
4571 -- With_Clause); otherwise the contents of the homonym chains are not
4575 -- Hide all the type entities of the public part of the package to
4576 -- avoid its usage. This is needed to cover all the subtype decla-
4577 -- rations because we do not remove them from the homonym chain.
4579 E := First_Entity (P);
4580 while Present (E) and then E /= First_Private_Entity (P) loop
4582 Set_Was_Hidden (E, Is_Hidden (E));
4589 -- Replace the real entities by the shadow entities of the limited
4590 -- view. The first element of the limited view is a header that is
4591 -- used to reference the first shadow entity in the private part
4592 -- of the package. Successive elements are the limited views of the
4593 -- type (including regular incomplete types) declared in the package.
4595 Lim_Header := Limited_View (P);
4597 Lim_Typ := First_Entity (Lim_Header);
4598 while Present (Lim_Typ)
4599 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4601 pragma Assert (not In_Chain (Lim_Typ));
4603 -- Do not unchain nested packages and child units
4605 if Ekind (Lim_Typ) /= E_Package
4606 and then not Is_Child_Unit (Lim_Typ)
4612 Prev := Current_Entity (Lim_Typ);
4615 -- Replace E in the homonyms list, so that the limited
4616 -- view becomes available.
4618 if E = Non_Limited_View (Lim_Typ) then
4619 Set_Homonym (Lim_Typ, Homonym (Prev));
4620 Set_Current_Entity (Lim_Typ);
4624 E := Homonym (Prev);
4626 -- E may have been removed when installing a
4627 -- previous limited_with_clause.
4631 exit when E = Non_Limited_View (Lim_Typ);
4633 Prev := Homonym (Prev);
4637 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4638 Set_Homonym (Prev, Lim_Typ);
4643 if Debug_Flag_I then
4644 Write_Str (" (homonym) chain ");
4645 Write_Name (Chars (Lim_Typ));
4650 Next_Entity (Lim_Typ);
4654 -- The package must be visible while the limited-with clause is active
4655 -- because references to the type P.T must resolve in the usual way.
4656 -- In addition, we remember that the limited-view has been installed to
4657 -- uninstall it at the point of context removal.
4659 Set_Is_Immediately_Visible (P);
4660 Set_Limited_View_Installed (N);
4662 -- If unit has not been analyzed in some previous context, check
4663 -- (imperfectly ???) whether it might need a body.
4665 if not Analyzed (P_Unit) then
4666 Check_Body_Required;
4669 -- If the package in the limited_with clause is a child unit, the
4670 -- clause is unanalyzed and appears as a selected component. Recast
4671 -- it as an expanded name so that the entity can be properly set. Use
4672 -- entity of parent, if available, for higher ancestors in the name.
4674 if Nkind (Name (N)) = N_Selected_Component then
4682 while Nkind (Nam) = N_Selected_Component
4683 and then Present (Ent)
4685 Change_Selected_Component_To_Expanded_Name (Nam);
4687 -- Set entity of parent identifiers if the unit is a child
4688 -- unit. This ensures that the tree is properly formed from
4689 -- semantic point of view (e.g. for ASIS queries).
4691 Set_Entity (Nam, Ent);
4693 Nam := Prefix (Nam);
4696 -- Set entity of last ancestor
4698 if Nkind (Nam) = N_Identifier then
4699 Set_Entity (Nam, Ent);
4705 Set_Entity (Name (N), P);
4706 Set_From_With_Type (P);
4707 end Install_Limited_Withed_Unit;
4709 -------------------------
4710 -- Install_Withed_Unit --
4711 -------------------------
4713 procedure Install_Withed_Unit
4714 (With_Clause : Node_Id;
4715 Private_With_OK : Boolean := False)
4717 Uname : constant Entity_Id := Entity (Name (With_Clause));
4718 P : constant Entity_Id := Scope (Uname);
4721 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4722 -- compiling a package declaration and the Private_With_OK flag was not
4723 -- set by the caller. These declarations will be installed later (before
4724 -- analyzing the private part of the package).
4726 if Private_Present (With_Clause)
4727 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
4728 and then not (Private_With_OK)
4733 if Debug_Flag_I then
4734 if Private_Present (With_Clause) then
4735 Write_Str ("install private withed unit ");
4737 Write_Str ("install withed unit ");
4740 Write_Name (Chars (Uname));
4744 -- We do not apply the restrictions to an internal unit unless
4745 -- we are compiling the internal unit as a main unit. This check
4746 -- is also skipped for dummy units (for missing packages).
4748 if Sloc (Uname) /= No_Location
4749 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
4750 or else Current_Sem_Unit = Main_Unit)
4752 Check_Restricted_Unit
4753 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
4756 if P /= Standard_Standard then
4758 -- If the unit is not analyzed after analysis of the with clause and
4759 -- it is an instantiation then it awaits a body and is the main unit.
4760 -- Its appearance in the context of some other unit indicates a
4761 -- circular dependency (DEC suite perversity).
4763 if not Analyzed (Uname)
4764 and then Nkind (Parent (Uname)) = N_Package_Instantiation
4767 ("instantiation depends on itself", Name (With_Clause));
4769 elsif not Is_Visible_Child_Unit (Uname) then
4770 Set_Is_Visible_Child_Unit (Uname);
4772 -- If the child unit appears in the context of its parent, it is
4773 -- immediately visible.
4775 if In_Open_Scopes (Scope (Uname)) then
4776 Set_Is_Immediately_Visible (Uname);
4779 if Is_Generic_Instance (Uname)
4780 and then Ekind (Uname) in Subprogram_Kind
4782 -- Set flag as well on the visible entity that denotes the
4783 -- instance, which renames the current one.
4785 Set_Is_Visible_Child_Unit
4787 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
4790 -- The parent unit may have been installed already, and may have
4791 -- appeared in a use clause.
4793 if In_Use (Scope (Uname)) then
4794 Set_Is_Potentially_Use_Visible (Uname);
4797 Set_Context_Installed (With_Clause);
4800 elsif not Is_Immediately_Visible (Uname) then
4801 if not Private_Present (With_Clause)
4802 or else Private_With_OK
4804 Set_Is_Immediately_Visible (Uname);
4807 Set_Context_Installed (With_Clause);
4810 -- A with-clause overrides a with-type clause: there are no restric-
4811 -- tions on the use of package entities.
4813 if Ekind (Uname) = E_Package then
4814 Set_From_With_Type (Uname, False);
4817 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4818 -- unit if there is a visible homograph for it declared in the same
4819 -- declarative region. This pathological case can only arise when an
4820 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4821 -- G1 has a generic child also named G2, and the context includes with_
4822 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4823 -- of I1.G2 visible as well. If the child unit is named Standard, do
4824 -- not apply the check to the Standard package itself.
4826 if Is_Child_Unit (Uname)
4827 and then Is_Visible_Child_Unit (Uname)
4828 and then Ada_Version >= Ada_05
4831 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
4837 U2 := Homonym (Uname);
4839 and then U2 /= Standard_Standard
4842 Decl2 := Unit_Declaration_Node (P2);
4844 if Is_Child_Unit (U2)
4845 and then Is_Visible_Child_Unit (U2)
4847 if Is_Generic_Instance (P)
4848 and then Nkind (Decl1) = N_Package_Declaration
4849 and then Generic_Parent (Specification (Decl1)) = P2
4851 Error_Msg_N ("illegal with_clause", With_Clause);
4853 ("\child unit has visible homograph" &
4854 " (RM 8.3(26), 10.1.1(19))",
4858 elsif Is_Generic_Instance (P2)
4859 and then Nkind (Decl2) = N_Package_Declaration
4860 and then Generic_Parent (Specification (Decl2)) = P
4862 -- With_clause for child unit of instance appears before
4863 -- in the context. We want to place the error message on
4864 -- it, not on the generic child unit itself.
4867 Prev_Clause : Node_Id;
4870 Prev_Clause := First (List_Containing (With_Clause));
4871 while Entity (Name (Prev_Clause)) /= U2 loop
4875 pragma Assert (Present (Prev_Clause));
4876 Error_Msg_N ("illegal with_clause", Prev_Clause);
4878 ("\child unit has visible homograph" &
4879 " (RM 8.3(26), 10.1.1(19))",
4890 end Install_Withed_Unit;
4896 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
4897 K : constant Node_Kind := Nkind (Lib_Unit);
4900 return (K in N_Generic_Declaration or else
4901 K in N_Generic_Instantiation or else
4902 K in N_Generic_Renaming_Declaration or else
4903 K = N_Package_Declaration or else
4904 K = N_Package_Renaming_Declaration or else
4905 K = N_Subprogram_Declaration or else
4906 K = N_Subprogram_Renaming_Declaration)
4907 and then Present (Parent_Spec (Lib_Unit));
4910 -----------------------
4911 -- Load_Needed_Body --
4912 -----------------------
4914 -- N is a generic unit named in a with clause, or else it is a unit that
4915 -- contains a generic unit or an inlined function. In order to perform an
4916 -- instantiation, the body of the unit must be present. If the unit itself
4917 -- is generic, we assume that an instantiation follows, and load & analyze
4918 -- the body unconditionally. This forces analysis of the spec as well.
4920 -- If the unit is not generic, but contains a generic unit, it is loaded on
4921 -- demand, at the point of instantiation (see ch12).
4923 procedure Load_Needed_Body (N : Node_Id; OK : out Boolean) is
4924 Body_Name : Unit_Name_Type;
4925 Unum : Unit_Number_Type;
4927 Save_Style_Check : constant Boolean := Opt.Style_Check;
4928 -- The loading and analysis is done with style checks off
4931 if not GNAT_Mode then
4932 Style_Check := False;
4935 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
4938 (Load_Name => Body_Name,
4944 if Unum = No_Unit then
4948 Compiler_State := Analyzing; -- reset after load
4950 if not Fatal_Error (Unum) or else Try_Semantics then
4951 if Debug_Flag_L then
4952 Write_Str ("*** Loaded generic body");
4956 Semantics (Cunit (Unum));
4962 Style_Check := Save_Style_Check;
4963 end Load_Needed_Body;
4965 -------------------------
4966 -- Build_Limited_Views --
4967 -------------------------
4969 procedure Build_Limited_Views (N : Node_Id) is
4970 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
4971 P : constant Entity_Id := Cunit_Entity (Unum);
4973 Spec : Node_Id; -- To denote a package specification
4974 Lim_Typ : Entity_Id; -- To denote shadow entities
4975 Comp_Typ : Entity_Id; -- To denote real entities
4977 Lim_Header : Entity_Id; -- Package entity
4978 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
4979 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
4981 procedure Decorate_Incomplete_Type
4984 -- Add attributes of an incomplete type to a shadow entity. The same
4985 -- attributes are placed on the real entity, so that gigi receives
4986 -- a consistent view.
4988 procedure Decorate_Package_Specification (P : Entity_Id);
4989 -- Add attributes of a package entity to the entity in a package
4992 procedure Decorate_Tagged_Type
4996 -- Set basic attributes of tagged type T, including its class_wide type.
4997 -- The parameters Loc, Scope are used to decorate the class_wide type.
4999 procedure Build_Chain
5001 First_Decl : Node_Id);
5002 -- Construct list of shadow entities and attach it to entity of
5003 -- package that is mentioned in a limited_with clause.
5005 function New_Internal_Shadow_Entity
5006 (Kind : Entity_Kind;
5007 Sloc_Value : Source_Ptr;
5008 Id_Char : Character) return Entity_Id;
5009 -- Build a new internal entity and append it to the list of shadow
5010 -- entities available through the limited-header
5012 ------------------------------
5013 -- Decorate_Incomplete_Type --
5014 ------------------------------
5016 procedure Decorate_Incomplete_Type
5021 Set_Ekind (E, E_Incomplete_Type);
5022 Set_Scope (E, Scop);
5024 Set_Is_First_Subtype (E, True);
5025 Set_Stored_Constraint (E, No_Elist);
5026 Set_Full_View (E, Empty);
5027 Init_Size_Align (E);
5028 end Decorate_Incomplete_Type;
5030 --------------------------
5031 -- Decorate_Tagged_Type --
5032 --------------------------
5034 procedure Decorate_Tagged_Type
5042 Decorate_Incomplete_Type (T, Scop);
5043 Set_Is_Tagged_Type (T);
5045 -- Build corresponding class_wide type, if not previously done
5047 -- Note: The class-wide entity is shared by the limited-view
5048 -- and the full-view.
5050 if No (Class_Wide_Type (T)) then
5051 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S'));
5053 -- Set parent to be the same as the parent of the tagged type.
5054 -- We need a parent field set, and it is supposed to point to
5055 -- the declaration of the type. The tagged type declaration
5056 -- essentially declares two separate types, the tagged type
5057 -- itself and the corresponding class-wide type, so it is
5058 -- reasonable for the parent fields to point to the declaration
5061 Set_Parent (CW, Parent (T));
5063 -- Set remaining fields of classwide type
5065 Set_Ekind (CW, E_Class_Wide_Type);
5067 Set_Scope (CW, Scop);
5068 Set_Is_Tagged_Type (CW);
5069 Set_Is_First_Subtype (CW, True);
5070 Init_Size_Align (CW);
5071 Set_Has_Unknown_Discriminants (CW, True);
5072 Set_Class_Wide_Type (CW, CW);
5073 Set_Equivalent_Type (CW, Empty);
5074 Set_From_With_Type (CW, From_With_Type (T));
5076 -- Link type to its class-wide type
5078 Set_Class_Wide_Type (T, CW);
5080 end Decorate_Tagged_Type;
5082 ------------------------------------
5083 -- Decorate_Package_Specification --
5084 ------------------------------------
5086 procedure Decorate_Package_Specification (P : Entity_Id) is
5088 -- Place only the most basic attributes
5090 Set_Ekind (P, E_Package);
5091 Set_Etype (P, Standard_Void_Type);
5092 end Decorate_Package_Specification;
5094 --------------------------------
5095 -- New_Internal_Shadow_Entity --
5096 --------------------------------
5098 function New_Internal_Shadow_Entity
5099 (Kind : Entity_Kind;
5100 Sloc_Value : Source_Ptr;
5101 Id_Char : Character) return Entity_Id
5103 E : constant Entity_Id :=
5104 Make_Defining_Identifier (Sloc_Value,
5105 Chars => New_Internal_Name (Id_Char));
5108 Set_Ekind (E, Kind);
5109 Set_Is_Internal (E, True);
5111 if Kind in Type_Kind then
5112 Init_Size_Align (E);
5115 Append_Entity (E, Lim_Header);
5118 end New_Internal_Shadow_Entity;
5124 procedure Build_Chain
5126 First_Decl : Node_Id)
5128 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
5129 Is_Tagged : Boolean;
5134 while Present (Decl) loop
5136 -- For each library_package_declaration in the environment, there
5137 -- is an implicit declaration of a *limited view* of that library
5138 -- package. The limited view of a package contains:
5140 -- * For each nested package_declaration, a declaration of the
5141 -- limited view of that package, with the same defining-
5142 -- program-unit name.
5144 -- * For each type_declaration in the visible part, an incomplete
5145 -- type-declaration with the same defining_identifier, whose
5146 -- completion is the type_declaration. If the type_declaration
5147 -- is tagged, then the incomplete_type_declaration is tagged
5150 -- The partial view is tagged if the declaration has the
5151 -- explicit keyword, or else if it is a type extension, both
5152 -- of which can be ascertained syntactically.
5154 if Nkind (Decl) = N_Full_Type_Declaration then
5156 (Nkind (Type_Definition (Decl)) = N_Record_Definition
5157 and then Tagged_Present (Type_Definition (Decl)))
5159 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
5162 (Record_Extension_Part (Type_Definition (Decl))));
5164 Comp_Typ := Defining_Identifier (Decl);
5166 if not Analyzed_Unit then
5168 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5170 Decorate_Incomplete_Type (Comp_Typ, Scope);
5174 -- Create shadow entity for type
5176 Lim_Typ := New_Internal_Shadow_Entity
5177 (Kind => Ekind (Comp_Typ),
5178 Sloc_Value => Sloc (Comp_Typ),
5181 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5182 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5183 Set_From_With_Type (Lim_Typ);
5186 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5188 Decorate_Incomplete_Type (Lim_Typ, Scope);
5191 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5193 elsif Nkind_In (Decl, N_Private_Type_Declaration,
5194 N_Incomplete_Type_Declaration,
5195 N_Task_Type_Declaration,
5196 N_Protected_Type_Declaration)
5198 Comp_Typ := Defining_Identifier (Decl);
5201 Nkind_In (Decl, N_Private_Type_Declaration,
5202 N_Incomplete_Type_Declaration)
5203 and then Tagged_Present (Decl);
5205 if not Analyzed_Unit then
5207 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5209 Decorate_Incomplete_Type (Comp_Typ, Scope);
5213 Lim_Typ := New_Internal_Shadow_Entity
5214 (Kind => Ekind (Comp_Typ),
5215 Sloc_Value => Sloc (Comp_Typ),
5218 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5219 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5220 Set_From_With_Type (Lim_Typ);
5223 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5225 Decorate_Incomplete_Type (Lim_Typ, Scope);
5228 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5230 elsif Nkind (Decl) = N_Private_Extension_Declaration then
5231 Comp_Typ := Defining_Identifier (Decl);
5233 if not Analyzed_Unit then
5234 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5237 -- Create shadow entity for type
5239 Lim_Typ := New_Internal_Shadow_Entity
5240 (Kind => Ekind (Comp_Typ),
5241 Sloc_Value => Sloc (Comp_Typ),
5244 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5245 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5246 Set_From_With_Type (Lim_Typ);
5248 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5249 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5251 elsif Nkind (Decl) = N_Package_Declaration then
5256 Spec : constant Node_Id := Specification (Decl);
5259 Comp_Typ := Defining_Unit_Name (Spec);
5261 if not Analyzed (Cunit (Unum)) then
5262 Decorate_Package_Specification (Comp_Typ);
5263 Set_Scope (Comp_Typ, Scope);
5266 Lim_Typ := New_Internal_Shadow_Entity
5267 (Kind => Ekind (Comp_Typ),
5268 Sloc_Value => Sloc (Comp_Typ),
5271 Decorate_Package_Specification (Lim_Typ);
5272 Set_Scope (Lim_Typ, Scope);
5274 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5275 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5276 Set_From_With_Type (Lim_Typ);
5278 -- Note: The non_limited_view attribute is not used
5279 -- for local packages.
5283 First_Decl => First (Visible_Declarations (Spec)));
5291 -- Start of processing for Build_Limited_Views
5294 pragma Assert (Limited_Present (N));
5296 -- A library_item mentioned in a limited_with_clause is a package
5297 -- declaration, not a subprogram declaration, generic declaration,
5298 -- generic instantiation, or package renaming declaration.
5300 case Nkind (Unit (Library_Unit (N))) is
5301 when N_Package_Declaration =>
5304 when N_Subprogram_Declaration =>
5305 Error_Msg_N ("subprograms not allowed in "
5306 & "limited with_clauses", N);
5309 when N_Generic_Package_Declaration |
5310 N_Generic_Subprogram_Declaration =>
5311 Error_Msg_N ("generics not allowed in "
5312 & "limited with_clauses", N);
5315 when N_Generic_Instantiation =>
5316 Error_Msg_N ("generic instantiations not allowed in "
5317 & "limited with_clauses", N);
5320 when N_Generic_Renaming_Declaration =>
5321 Error_Msg_N ("generic renamings not allowed in "
5322 & "limited with_clauses", N);
5325 when N_Subprogram_Renaming_Declaration =>
5326 Error_Msg_N ("renamed subprograms not allowed in "
5327 & "limited with_clauses", N);
5330 when N_Package_Renaming_Declaration =>
5331 Error_Msg_N ("renamed packages not allowed in "
5332 & "limited with_clauses", N);
5336 raise Program_Error;
5339 -- Check if the chain is already built
5341 Spec := Specification (Unit (Library_Unit (N)));
5343 if Limited_View_Installed (Spec) then
5347 Set_Ekind (P, E_Package);
5349 -- Build the header of the limited_view
5352 Make_Defining_Identifier (Sloc (N),
5353 Chars => New_Internal_Name (Id_Char => 'Z'));
5354 Set_Ekind (Lim_Header, E_Package);
5355 Set_Is_Internal (Lim_Header);
5356 Set_Limited_View (P, Lim_Header);
5358 -- Create the auxiliary chain. All the shadow entities are appended to
5359 -- the list of entities of the limited-view header
5363 First_Decl => First (Visible_Declarations (Spec)));
5365 -- Save the last built shadow entity. It is needed later to set the
5366 -- reference to the first shadow entity in the private part
5368 Last_Pub_Lim_E := Last_Lim_E;
5370 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5371 -- Required to give support to limited-private-with clauses
5373 Build_Chain (Scope => P,
5374 First_Decl => First (Private_Declarations (Spec)));
5376 if Last_Pub_Lim_E /= Empty then
5377 Set_First_Private_Entity (Lim_Header,
5378 Next_Entity (Last_Pub_Lim_E));
5380 Set_First_Private_Entity (Lim_Header,
5384 Set_Limited_View_Installed (Spec);
5385 end Build_Limited_Views;
5387 -------------------------------
5388 -- Check_Body_Needed_For_SAL --
5389 -------------------------------
5391 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5393 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5394 -- Determine whether use of entity E might require the presence of its
5395 -- body. For a package this requires a recursive traversal of all nested
5398 ---------------------------
5399 -- Entity_Needed_For_SAL --
5400 ---------------------------
5402 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5406 if Is_Subprogram (E)
5407 and then Has_Pragma_Inline (E)
5411 elsif Ekind (E) = E_Generic_Function
5412 or else Ekind (E) = E_Generic_Procedure
5416 elsif Ekind (E) = E_Generic_Package
5418 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5419 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5423 elsif Ekind (E) = E_Package
5425 Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5426 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5428 Ent := First_Entity (E);
5429 while Present (Ent) loop
5430 if Entity_Needs_Body (Ent) then
5442 end Entity_Needs_Body;
5444 -- Start of processing for Check_Body_Needed_For_SAL
5447 if Ekind (Unit_Name) = E_Generic_Package
5449 Nkind (Unit_Declaration_Node (Unit_Name)) =
5450 N_Generic_Package_Declaration
5452 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5454 Set_Body_Needed_For_SAL (Unit_Name);
5456 elsif Ekind (Unit_Name) = E_Generic_Procedure
5457 or else Ekind (Unit_Name) = E_Generic_Function
5459 Set_Body_Needed_For_SAL (Unit_Name);
5461 elsif Is_Subprogram (Unit_Name)
5462 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5463 N_Subprogram_Declaration
5464 and then Has_Pragma_Inline (Unit_Name)
5466 Set_Body_Needed_For_SAL (Unit_Name);
5468 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5469 Check_Body_Needed_For_SAL
5470 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5472 elsif Ekind (Unit_Name) = E_Package
5473 and then Entity_Needs_Body (Unit_Name)
5475 Set_Body_Needed_For_SAL (Unit_Name);
5477 elsif Ekind (Unit_Name) = E_Package_Body
5478 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5480 Check_Body_Needed_For_SAL
5481 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5483 end Check_Body_Needed_For_SAL;
5485 --------------------
5486 -- Remove_Context --
5487 --------------------
5489 procedure Remove_Context (N : Node_Id) is
5490 Lib_Unit : constant Node_Id := Unit (N);
5493 -- If this is a child unit, first remove the parent units
5495 if Is_Child_Spec (Lib_Unit) then
5496 Remove_Parents (Lib_Unit);
5499 Remove_Context_Clauses (N);
5502 ----------------------------
5503 -- Remove_Context_Clauses --
5504 ----------------------------
5506 procedure Remove_Context_Clauses (N : Node_Id) is
5508 Unit_Name : Entity_Id;
5511 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5512 -- limited-views first and regular-views later (to maintain the
5515 -- First Phase: Remove limited_with context clauses
5517 Item := First (Context_Items (N));
5518 while Present (Item) loop
5520 -- We are interested only in with clauses which got installed
5523 if Nkind (Item) = N_With_Clause
5524 and then Limited_Present (Item)
5525 and then Limited_View_Installed (Item)
5527 Remove_Limited_With_Clause (Item);
5533 -- Second Phase: Loop through context items and undo regular
5534 -- with_clauses and use_clauses.
5536 Item := First (Context_Items (N));
5537 while Present (Item) loop
5539 -- We are interested only in with clauses which got installed on
5540 -- entry, as indicated by their Context_Installed flag set
5542 if Nkind (Item) = N_With_Clause
5543 and then Limited_Present (Item)
5544 and then Limited_View_Installed (Item)
5548 elsif Nkind (Item) = N_With_Clause
5549 and then Context_Installed (Item)
5551 -- Remove items from one with'ed unit
5553 Unit_Name := Entity (Name (Item));
5554 Remove_Unit_From_Visibility (Unit_Name);
5555 Set_Context_Installed (Item, False);
5557 elsif Nkind (Item) = N_Use_Package_Clause then
5558 End_Use_Package (Item);
5560 elsif Nkind (Item) = N_Use_Type_Clause then
5561 End_Use_Type (Item);
5566 end Remove_Context_Clauses;
5568 --------------------------------
5569 -- Remove_Limited_With_Clause --
5570 --------------------------------
5572 procedure Remove_Limited_With_Clause (N : Node_Id) is
5573 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5576 Lim_Header : Entity_Id;
5577 Lim_Typ : Entity_Id;
5581 pragma Assert (Limited_View_Installed (N));
5583 -- In case of limited with_clause on subprograms, generics, instances,
5584 -- or renamings, the corresponding error was previously posted and we
5585 -- have nothing to do here.
5587 if Nkind (P_Unit) /= N_Package_Declaration then
5591 P := Defining_Unit_Name (Specification (P_Unit));
5593 -- Handle child packages
5595 if Nkind (P) = N_Defining_Program_Unit_Name then
5596 P := Defining_Identifier (P);
5599 if Debug_Flag_I then
5600 Write_Str ("remove limited view of ");
5601 Write_Name (Chars (P));
5602 Write_Str (" from visibility");
5606 -- Prepare the removal of the shadow entities from visibility. The
5607 -- first element of the limited view is a header (an E_Package
5608 -- entity) that is used to reference the first shadow entity in the
5609 -- private part of the package
5611 Lim_Header := Limited_View (P);
5612 Lim_Typ := First_Entity (Lim_Header);
5614 -- Remove package and shadow entities from visibility if it has not
5617 if not Analyzed (P_Unit) then
5619 Set_Is_Immediately_Visible (P, False);
5621 while Present (Lim_Typ) loop
5623 Next_Entity (Lim_Typ);
5626 -- Otherwise this package has already appeared in the closure and its
5627 -- shadow entities must be replaced by its real entities. This code
5628 -- must be kept synchronized with the complementary code in Install
5629 -- Limited_Withed_Unit.
5632 -- Real entities that are type or subtype declarations were hidden
5633 -- from visibility at the point of installation of the limited-view.
5634 -- Now we recover the previous value of the hidden attribute.
5636 E := First_Entity (P);
5637 while Present (E) and then E /= First_Private_Entity (P) loop
5639 Set_Is_Hidden (E, Was_Hidden (E));
5645 while Present (Lim_Typ)
5646 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5648 -- Nested packages and child units were not unchained
5650 if Ekind (Lim_Typ) /= E_Package
5651 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5654 -- If the package has incomplete types, the limited view
5655 -- of the incomplete type is in fact never visible (AI05-129)
5656 -- but we have created a shadow entity E1 for it, that points
5657 -- to E2, a non-limited incomplete type. This in turn has a
5658 -- full view E3 that is the full declaration. There is a
5659 -- corresponding shadow entity E4. When reinstalling the
5660 -- non-limited view, E2 must become the current entity and
5661 -- E3 must be ignored.
5663 E := Non_Limited_View (Lim_Typ);
5665 if Present (Current_Entity (E))
5666 and then Ekind (Current_Entity (E)) = E_Incomplete_Type
5667 and then Full_View (Current_Entity (E)) = E
5670 -- Lim_Typ is the limited view of a full type declaration
5671 -- that has a previous incomplete declaration, i.e. E3
5672 -- from the previous description. Nothing to insert.
5677 pragma Assert (not In_Chain (E));
5679 Prev := Current_Entity (Lim_Typ);
5681 if Prev = Lim_Typ then
5682 Set_Current_Entity (E);
5685 while Present (Prev)
5686 and then Homonym (Prev) /= Lim_Typ
5688 Prev := Homonym (Prev);
5691 if Present (Prev) then
5692 Set_Homonym (Prev, E);
5696 -- Preserve structure of homonym chain.
5698 Set_Homonym (E, Homonym (Lim_Typ));
5702 Next_Entity (Lim_Typ);
5706 -- Indicate that the limited view of the package is not installed
5708 Set_From_With_Type (P, False);
5709 Set_Limited_View_Installed (N, False);
5710 end Remove_Limited_With_Clause;
5712 --------------------
5713 -- Remove_Parents --
5714 --------------------
5716 procedure Remove_Parents (Lib_Unit : Node_Id) is
5719 P_Spec : Node_Id := Empty;
5721 Vis : constant Boolean :=
5722 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
5725 if Is_Child_Spec (Lib_Unit) then
5726 P_Spec := Parent_Spec (Lib_Unit);
5728 elsif Nkind (Lib_Unit) = N_Package_Body
5729 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
5731 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
5734 if Present (P_Spec) then
5737 P_Name := Get_Parent_Entity (P);
5738 Remove_Context_Clauses (P_Spec);
5739 End_Package_Scope (P_Name);
5740 Set_Is_Immediately_Visible (P_Name, Vis);
5742 -- Remove from visibility the siblings as well, which are directly
5743 -- visible while the parent is in scope.
5745 E := First_Entity (P_Name);
5746 while Present (E) loop
5747 if Is_Child_Unit (E) then
5748 Set_Is_Immediately_Visible (E, False);
5754 Set_In_Package_Body (P_Name, False);
5756 -- This is the recursive call to remove the context of any
5757 -- higher level parent. This recursion ensures that all parents
5758 -- are removed in the reverse order of their installation.
5764 ---------------------------------
5765 -- Remove_Private_With_Clauses --
5766 ---------------------------------
5768 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
5771 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
5772 -- Check whether a given unit appears in a regular with_clause.
5773 -- Used to determine whether a private_with_clause, implicit or
5774 -- explicit, should be ignored.
5776 ----------------------------
5777 -- In_Regular_With_Clause --
5778 ----------------------------
5780 function In_Regular_With_Clause (E : Entity_Id) return Boolean
5785 Item := First (Context_Items (Comp_Unit));
5786 while Present (Item) loop
5787 if Nkind (Item) = N_With_Clause
5788 and then Entity (Name (Item)) = E
5789 and then not Private_Present (Item)
5797 end In_Regular_With_Clause;
5799 -- Start of processing for Remove_Private_With_Clauses
5802 Item := First (Context_Items (Comp_Unit));
5803 while Present (Item) loop
5804 if Nkind (Item) = N_With_Clause
5805 and then Private_Present (Item)
5807 -- If private_with_clause is redundant, remove it from
5808 -- context, as a small optimization to subsequent handling
5809 -- of private_with clauses in other nested packages..
5811 if In_Regular_With_Clause (Entity (Name (Item))) then
5813 Nxt : constant Node_Id := Next (Item);
5819 elsif Limited_Present (Item) then
5820 if not Limited_View_Installed (Item) then
5821 Remove_Limited_With_Clause (Item);
5827 Remove_Unit_From_Visibility (Entity (Name (Item)));
5828 Set_Context_Installed (Item, False);
5836 end Remove_Private_With_Clauses;
5838 ---------------------------------
5839 -- Remove_Unit_From_Visibility --
5840 ---------------------------------
5842 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
5843 P : constant Entity_Id := Scope (Unit_Name);
5846 if Debug_Flag_I then
5847 Write_Str ("remove unit ");
5848 Write_Name (Chars (Unit_Name));
5849 Write_Str (" from visibility");
5853 if P /= Standard_Standard then
5854 Set_Is_Visible_Child_Unit (Unit_Name, False);
5857 Set_Is_Potentially_Use_Visible (Unit_Name, False);
5858 Set_Is_Immediately_Visible (Unit_Name, False);
5859 end Remove_Unit_From_Visibility;
5874 procedure Unchain (E : Entity_Id) is
5878 Prev := Current_Entity (E);
5884 Set_Name_Entity_Id (Chars (E), Homonym (E));
5887 while Present (Prev)
5888 and then Homonym (Prev) /= E
5890 Prev := Homonym (Prev);
5893 if Present (Prev) then
5894 Set_Homonym (Prev, Homonym (E));
5898 if Debug_Flag_I then
5899 Write_Str (" (homonym) unchain ");
5900 Write_Name (Chars (E));
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