1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2006, 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree; use Atree;
28 with Debug; use Debug;
29 with Einfo; use Einfo;
30 with Errout; use Errout;
31 with Exp_Util; use Exp_Util;
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 Rtsfind; use Rtsfind;
48 with Sem_Ch3; use Sem_Ch3;
49 with Sem_Ch6; use Sem_Ch6;
50 with Sem_Ch7; use Sem_Ch7;
51 with Sem_Ch8; use Sem_Ch8;
52 with Sem_Dist; use Sem_Dist;
53 with Sem_Prag; use Sem_Prag;
54 with Sem_Util; use Sem_Util;
55 with Sem_Warn; use Sem_Warn;
56 with Stand; use Stand;
57 with Sinfo; use Sinfo;
58 with Sinfo.CN; use Sinfo.CN;
59 with Sinput; use Sinput;
60 with Snames; use Snames;
61 with Style; use Style;
62 with Stylesw; use Stylesw;
63 with Tbuild; use Tbuild;
64 with Ttypes; use Ttypes;
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_With_Type_Clauses (N : Node_Id);
88 -- If N is a body, verify that any with_type clauses on the spec, or
89 -- on the spec of any parent, have a matching with_clause.
91 procedure Check_Private_Child_Unit (N : Node_Id);
92 -- If a with_clause mentions a private child unit, the compilation
93 -- unit must be a member of the same family, as described in 10.1.2 (8).
95 procedure Check_Stub_Level (N : Node_Id);
96 -- Verify that a stub is declared immediately within a compilation unit,
97 -- and not in an inner frame.
99 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id);
100 -- When a child unit appears in a context clause, the implicit withs on
101 -- parents are made explicit, and with clauses are inserted in the context
102 -- clause before the one for the child. If a parent in the with_clause
103 -- is a renaming, the implicit with_clause is on the renaming whose name
104 -- is mentioned in the with_clause, and not on the package it renames.
105 -- N is the compilation unit whose list of context items receives the
106 -- implicit with_clauses.
108 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
109 -- Get defining entity of parent unit of a child unit. In most cases this
110 -- is the defining entity of the unit, but for a child instance whose
111 -- parent needs a body for inlining, the instantiation node of the parent
112 -- has not yet been rewritten as a package declaration, and the entity has
113 -- to be retrieved from the Instance_Spec of the unit.
115 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id);
116 -- If the main unit is a child unit, implicit withs are also added for
117 -- all its ancestors.
119 function In_Chain (E : Entity_Id) return Boolean;
120 -- Check that the shadow entity is not already in the homonym chain, for
121 -- example through a limited_with clause in a parent unit.
123 procedure Install_Context_Clauses (N : Node_Id);
124 -- Subsidiary to Install_Context and Install_Parents. Process only with_
125 -- and use_clauses for current unit and its library unit if any.
127 procedure Install_Limited_Context_Clauses (N : Node_Id);
128 -- Subsidiary to Install_Context. Process only limited with_clauses
129 -- for current unit. Implements Ada 2005 (AI-50217).
131 procedure Install_Limited_Withed_Unit (N : Node_Id);
132 -- Place shadow entities for a limited_with package in the visibility
133 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
135 procedure Install_Withed_Unit
136 (With_Clause : Node_Id;
137 Private_With_OK : Boolean := False);
138 -- If the unit is not a child unit, make unit immediately visible.
139 -- The caller ensures that the unit is not already currently installed.
140 -- The flag Private_With_OK is set true in Install_Private_With_Clauses,
141 -- which is called when compiling the private part of a package, or
142 -- installing the private declarations of a parent unit.
144 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean);
145 -- This procedure establishes the context for the compilation of a child
146 -- unit. If Lib_Unit is a child library spec then the context of the parent
147 -- is installed, and the parent itself made immediately visible, so that
148 -- the child unit is processed in the declarative region of the parent.
149 -- Install_Parents makes a recursive call to itself to ensure that all
150 -- parents are loaded in the nested case. If Lib_Unit is a library body,
151 -- the only effect of Install_Parents is to install the private decls of
152 -- the parents, because the visible parent declarations will have been
153 -- installed as part of the context of the corresponding spec.
155 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id);
156 -- In the compilation of a child unit, a child of any of the ancestor
157 -- units is directly visible if it is visible, because the parent is in
158 -- an enclosing scope. Iterate over context to find child units of U_Name
159 -- or of some ancestor of it.
161 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean;
162 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
163 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
164 -- a library spec that has a parent. If the call to Is_Child_Spec returns
165 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
166 -- compilation unit for the parent spec.
168 -- Lib_Unit can also be a subprogram body that acts as its own spec. If
169 -- the Parent_Spec is non-empty, this is also a child unit.
171 procedure Remove_With_Type_Clause (Name : Node_Id);
172 -- Remove imported type and its enclosing package from visibility, and
173 -- remove attributes of imported type so they don't interfere with its
174 -- analysis (should it appear otherwise in the context).
176 procedure Remove_Context_Clauses (N : Node_Id);
177 -- Subsidiary of previous one. Remove use_ and with_clauses
179 procedure Remove_Limited_With_Clause (N : Node_Id);
180 -- Remove from visibility the shadow entities introduced for a package
181 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
183 procedure Remove_Parents (Lib_Unit : Node_Id);
184 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
185 -- contexts established by the corresponding call to Install_Parents are
186 -- removed. Remove_Parents contains a recursive call to itself to ensure
187 -- that all parents are removed in the nested case.
189 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
190 -- Reset all visibility flags on unit after compiling it, either as a
191 -- main unit or as a unit in the context.
193 procedure Unchain (E : Entity_Id);
194 -- Remove single entity from visibility list
196 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
197 -- Common processing for all stubs (subprograms, tasks, packages, and
198 -- protected cases). N is the stub to be analyzed. Once the subunit
199 -- name is established, load and analyze. Nam is the non-overloadable
200 -- entity for which the proper body provides a completion. Subprogram
201 -- stubs are handled differently because they can be declarations.
203 --------------------------
204 -- Limited_With_Clauses --
205 --------------------------
207 -- Limited_With clauses are the mechanism chosen for Ada05 to support
208 -- mutually recursive types declared in different units. A limited_with
209 -- clause that names package P in the context of unit U makes the types
210 -- declared in the visible part of P available within U, but with the
211 -- restriction that these types can only be used as incomplete types.
212 -- The limited_with clause does not impose a semantic dependence on P,
213 -- and it is possible for two packages to have limited_with_clauses on
214 -- each other without creating an elaboration circularity.
216 -- To support this feature, the analysis of a limited_with clause must
217 -- create an abbreviated view of the package, without performing any
218 -- semantic analysis on it. This "package abstract" contains shadow
219 -- types that are in one-one correspondence with the real types in the
220 -- package, and that have the properties of incomplete types.
222 -- The implementation creates two element lists: one to chain the shadow
223 -- entities, and one to chain the corresponding type entities in the tree
224 -- of the package. Links between corresponding entities in both chains
225 -- allow the compiler to select the proper view of a given type, depending
226 -- on the context. Note that in contrast with the handling of private
227 -- types, the limited view and the non-limited view of a type are treated
228 -- as separate entities, and no entity exchange needs to take place, which
229 -- makes the implementation must simpler than could be feared.
231 ------------------------------
232 -- Analyze_Compilation_Unit --
233 ------------------------------
235 procedure Analyze_Compilation_Unit (N : Node_Id) is
236 Unit_Node : constant Node_Id := Unit (N);
237 Lib_Unit : Node_Id := Library_Unit (N);
239 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
240 Par_Spec_Name : Unit_Name_Type;
241 Unum : Unit_Number_Type;
243 procedure Check_Redundant_Withs
244 (Context_Items : List_Id;
245 Spec_Context_Items : List_Id := No_List);
246 -- Determine whether the context list of a compilation unit contains
247 -- redundant with clauses. When checking body clauses against spec
248 -- clauses, set Context_Items to the context list of the body and
249 -- Spec_Context_Items to that of the spec. Parent packages are not
250 -- examined for documentation purposes.
252 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
253 -- Generate cross-reference information for the parents of child units.
254 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
256 ---------------------------
257 -- Check_Redundant_Withs --
258 ---------------------------
260 procedure Check_Redundant_Withs
261 (Context_Items : List_Id;
262 Spec_Context_Items : List_Id := No_List)
266 procedure Process_Body_Clauses
267 (Context_List : List_Id;
269 Used : in out Boolean;
270 Used_Type_Or_Elab : in out Boolean);
271 -- Examine the context clauses of a package body, trying to match
272 -- the name entity of Clause with any list element. If the match
273 -- occurs on a use package clause, set Used to True, for a use
274 -- type clause, pragma Elaborate or pragma Elaborate_All, set
275 -- Used_Type_Or_Elab to True.
277 procedure Process_Spec_Clauses
278 (Context_List : List_Id;
280 Used : in out Boolean;
281 Withed : in out Boolean;
282 Exit_On_Self : Boolean := False);
283 -- Examine the context clauses of a package spec, trying to match
284 -- the name entity of Clause with any list element. If the match
285 -- occurs on a use package clause, set Used to True, for a with
286 -- package clause other than Clause, set Withed to True. Limited
287 -- with clauses, implicitly generated with clauses and withs
288 -- having pragmas Elaborate or Elaborate_All applied to them are
289 -- skipped. Exit_On_Self is used to control the search loop and
290 -- force an exit whenever Clause sees itself in the search.
292 --------------------------
293 -- Process_Body_Clauses --
294 --------------------------
296 procedure Process_Body_Clauses
297 (Context_List : List_Id;
299 Used : in out Boolean;
300 Used_Type_Or_Elab : in out Boolean)
302 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
310 Used_Type_Or_Elab := False;
312 Cont_Item := First (Context_List);
313 while Present (Cont_Item) loop
315 -- Package use clause
317 if Nkind (Cont_Item) = N_Use_Package_Clause
320 -- Search through use clauses
322 Use_Item := First (Names (Cont_Item));
323 while Present (Use_Item) and then not Used loop
325 -- Case of a direct use of the one we are looking for
327 if Entity (Use_Item) = Nam_Ent then
330 -- Handle nested case, as in "with P; use P.Q.R"
337 -- Loop through prefixes looking for match
340 while Nkind (UE) = N_Expanded_Name loop
341 if Entity (Prefix (UE)) = Nam_Ent then
356 elsif Nkind (Cont_Item) = N_Use_Type_Clause
357 and then not Used_Type_Or_Elab
359 Subt_Mark := First (Subtype_Marks (Cont_Item));
360 while Present (Subt_Mark)
361 and then not Used_Type_Or_Elab
363 if Entity (Prefix (Subt_Mark)) = Nam_Ent then
364 Used_Type_Or_Elab := True;
370 -- Pragma Elaborate or Elaborate_All
372 elsif Nkind (Cont_Item) = N_Pragma
374 (Chars (Cont_Item) = Name_Elaborate
376 Chars (Cont_Item) = Name_Elaborate_All)
377 and then not Used_Type_Or_Elab
380 First (Pragma_Argument_Associations (Cont_Item));
381 while Present (Prag_Unit)
382 and then not Used_Type_Or_Elab
384 if Entity (Expression (Prag_Unit)) = Nam_Ent then
385 Used_Type_Or_Elab := True;
394 end Process_Body_Clauses;
396 --------------------------
397 -- Process_Spec_Clauses --
398 --------------------------
400 procedure Process_Spec_Clauses
401 (Context_List : List_Id;
403 Used : in out Boolean;
404 Withed : in out Boolean;
405 Exit_On_Self : Boolean := False)
407 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
415 Cont_Item := First (Context_List);
416 while Present (Cont_Item) loop
418 -- Stop the search since the context items after Cont_Item
419 -- have already been examined in a previous iteration of
420 -- the reverse loop in Check_Redundant_Withs.
423 and Cont_Item = Clause
428 -- Package use clause
430 if Nkind (Cont_Item) = N_Use_Package_Clause
433 Use_Item := First (Names (Cont_Item));
434 while Present (Use_Item) and then not Used loop
435 if Entity (Use_Item) = Nam_Ent then
442 -- Package with clause. Avoid processing self, implicitly
443 -- generated with clauses or limited with clauses. Note
444 -- that we examine with clauses having pragmas Elaborate
445 -- or Elaborate_All applied to them due to cases such as:
449 -- pragma Elaborate (Pack);
451 -- In this case, the second with clause is redundant since
452 -- the pragma applies only to the first "with Pack;".
454 elsif Nkind (Cont_Item) = N_With_Clause
455 and then not Implicit_With (Cont_Item)
456 and then not Limited_Present (Cont_Item)
457 and then Cont_Item /= Clause
458 and then Entity (Name (Cont_Item)) = Nam_Ent
465 end Process_Spec_Clauses;
467 -- Start of processing for Check_Redundant_Withs
470 Clause := Last (Context_Items);
471 while Present (Clause) loop
473 -- Avoid checking implicitly generated with clauses, limited
474 -- with clauses or withs that have pragma Elaborate or
475 -- Elaborate_All apllied.
477 if Nkind (Clause) = N_With_Clause
478 and then not Implicit_With (Clause)
479 and then not Limited_Present (Clause)
480 and then not Elaborate_Present (Clause)
482 -- Package body-to-spec check
484 if Present (Spec_Context_Items) then
486 Used_In_Body : Boolean := False;
487 Used_In_Spec : Boolean := False;
488 Used_Type_Or_Elab : Boolean := False;
489 Withed_In_Spec : Boolean := False;
493 (Context_List => Spec_Context_Items,
495 Used => Used_In_Spec,
496 Withed => Withed_In_Spec);
499 (Context_List => Context_Items,
501 Used => Used_In_Body,
502 Used_Type_Or_Elab => Used_Type_Or_Elab);
504 -- "Type Elab" refers to the presence of either a use
505 -- type clause, pragmas Elaborate or Elaborate_All.
507 -- +---------------+---------------------------+------+
508 -- | Spec | Body | Warn |
509 -- +--------+------+--------+------+-----------+------+
510 -- | Withed | Used | Withed | Used | Type Elab | |
511 -- | X | | X | | | X |
512 -- | X | | X | X | | |
513 -- | X | | X | | X | |
514 -- | X | | X | X | X | |
515 -- | X | X | X | | | X |
516 -- | X | X | X | | X | |
517 -- | X | X | X | X | | X |
518 -- | X | X | X | X | X | |
519 -- +--------+------+--------+------+-----------+------+
522 and then not Used_Type_Or_Elab)
525 and then not Used_In_Body)
529 Error_Msg_N ("?redundant with clause in body", Clause);
532 Used_In_Body := False;
533 Used_In_Spec := False;
534 Used_Type_Or_Elab := False;
535 Withed_In_Spec := False;
538 -- Standalone package spec or body check
542 Dont_Care : Boolean := False;
543 Withed : Boolean := False;
546 -- The mechanism for examining the context clauses of a
547 -- package spec can be applied to package body clauses.
550 (Context_List => Context_Items,
554 Exit_On_Self => True);
557 Error_Msg_N ("?redundant with clause", Clause);
565 end Check_Redundant_Withs;
567 --------------------------------
568 -- Generate_Parent_References --
569 --------------------------------
571 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is
573 P_Name : Entity_Id := P_Id;
576 Pref := Name (Parent (Defining_Entity (N)));
578 if Nkind (Pref) = N_Expanded_Name then
580 -- Done already, if the unit has been compiled indirectly as
581 -- part of the closure of its context because of inlining.
586 while Nkind (Pref) = N_Selected_Component loop
587 Change_Selected_Component_To_Expanded_Name (Pref);
588 Set_Entity (Pref, P_Name);
589 Set_Etype (Pref, Etype (P_Name));
590 Generate_Reference (P_Name, Pref, 'r');
591 Pref := Prefix (Pref);
592 P_Name := Scope (P_Name);
595 -- The guard here on P_Name is to handle the error condition where
596 -- the parent unit is missing because the file was not found.
598 if Present (P_Name) then
599 Set_Entity (Pref, P_Name);
600 Set_Etype (Pref, Etype (P_Name));
601 Generate_Reference (P_Name, Pref, 'r');
602 Style.Check_Identifier (Pref, P_Name);
604 end Generate_Parent_References;
606 -- Start of processing for Analyze_Compilation_Unit
609 Process_Compilation_Unit_Pragmas (N);
611 -- If the unit is a subunit whose parent has not been analyzed (which
612 -- indicates that the main unit is a subunit, either the current one or
613 -- one of its descendents) then the subunit is compiled as part of the
614 -- analysis of the parent, which we proceed to do. Basically this gets
615 -- handled from the top down and we don't want to do anything at this
616 -- level (i.e. this subunit will be handled on the way down from the
617 -- parent), so at this level we immediately return. If the subunit
618 -- ends up not analyzed, it means that the parent did not contain a
619 -- stub for it, or that there errors were dectected in some ancestor.
621 if Nkind (Unit_Node) = N_Subunit
622 and then not Analyzed (Lib_Unit)
624 Semantics (Lib_Unit);
626 if not Analyzed (Proper_Body (Unit_Node)) then
627 if Serious_Errors_Detected > 0 then
628 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N);
630 Error_Msg_N ("missing stub for subunit", N);
637 -- Analyze context (this will call Sem recursively for with'ed units)
641 -- If the unit is a package body, the spec is already loaded and must
642 -- be analyzed first, before we analyze the body.
644 if Nkind (Unit_Node) = N_Package_Body then
646 -- If no Lib_Unit, then there was a serious previous error, so
647 -- just ignore the entire analysis effort
649 if No (Lib_Unit) then
653 Semantics (Lib_Unit);
654 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
656 -- Verify that the library unit is a package declaration
658 if Nkind (Unit (Lib_Unit)) /= N_Package_Declaration
660 Nkind (Unit (Lib_Unit)) /= N_Generic_Package_Declaration
663 ("no legal package declaration for package body", N);
666 -- Otherwise, the entity in the declaration is visible. Update
667 -- the version to reflect dependence of this body on the spec.
670 Spec_Id := Defining_Entity (Unit (Lib_Unit));
671 Set_Is_Immediately_Visible (Spec_Id, True);
672 Version_Update (N, Lib_Unit);
674 if Nkind (Defining_Unit_Name (Unit_Node))
675 = N_Defining_Program_Unit_Name
677 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
682 -- If the unit is a subprogram body, then we similarly need to analyze
683 -- its spec. However, things are a little simpler in this case, because
684 -- here, this analysis is done only for error checking and consistency
685 -- purposes, so there's nothing else to be done.
687 elsif Nkind (Unit_Node) = N_Subprogram_Body then
688 if Acts_As_Spec (N) then
690 -- If the subprogram body is a child unit, we must create a
691 -- declaration for it, in order to properly load the parent(s).
692 -- After this, the original unit does not acts as a spec, because
693 -- there is an explicit one. If this unit appears in a context
694 -- clause, then an implicit with on the parent will be added when
695 -- installing the context. If this is the main unit, there is no
696 -- Unit_Table entry for the declaration, (It has the unit number
697 -- of the main unit) and code generation is unaffected.
699 Unum := Get_Cunit_Unit_Number (N);
700 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
702 if Par_Spec_Name /= No_Name then
705 (Load_Name => Par_Spec_Name,
710 if Unum /= No_Unit then
712 -- Build subprogram declaration and attach parent unit to it
713 -- This subprogram declaration does not come from source,
714 -- Nevertheless the backend must generate debugging info for
715 -- it, and this must be indicated explicitly.
718 Loc : constant Source_Ptr := Sloc (N);
719 SCS : constant Boolean :=
720 Get_Comes_From_Source_Default;
723 Set_Comes_From_Source_Default (False);
725 Make_Compilation_Unit (Loc,
726 Context_Items => New_Copy_List (Context_Items (N)),
728 Make_Subprogram_Declaration (Sloc (N),
731 (Specification (Unit_Node))),
733 Make_Compilation_Unit_Aux (Loc));
735 Set_Library_Unit (N, Lib_Unit);
736 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
737 Semantics (Lib_Unit);
738 Set_Acts_As_Spec (N, False);
739 Set_Needs_Debug_Info (Defining_Entity (Unit (Lib_Unit)));
740 Set_Comes_From_Source_Default (SCS);
745 -- Here for subprogram with separate declaration
748 Semantics (Lib_Unit);
749 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
750 Version_Update (N, Lib_Unit);
753 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
754 N_Defining_Program_Unit_Name
756 Generate_Parent_References (
757 Specification (Unit_Node),
758 Scope (Defining_Entity (Unit (Lib_Unit))));
762 -- If it is a child unit, the parent must be elaborated first
763 -- and we update version, since we are dependent on our parent.
765 if Is_Child_Spec (Unit_Node) then
767 -- The analysis of the parent is done with style checks off
770 Save_Style_Check : constant Boolean := Style_Check;
771 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
772 Cunit_Boolean_Restrictions_Save;
775 if not GNAT_Mode then
776 Style_Check := False;
779 Semantics (Parent_Spec (Unit_Node));
780 Version_Update (N, Parent_Spec (Unit_Node));
781 Style_Check := Save_Style_Check;
782 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
786 -- With the analysis done, install the context. Note that we can't
787 -- install the context from the with clauses as we analyze them,
788 -- because each with clause must be analyzed in a clean visibility
789 -- context, so we have to wait and install them all at once.
793 if Is_Child_Spec (Unit_Node) then
795 -- Set the entities of all parents in the program_unit_name
797 Generate_Parent_References (
798 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
801 -- All components of the context: with-clauses, library unit, ancestors
802 -- if any, (and their context) are analyzed and installed. Now analyze
803 -- the unit itself, which is either a package, subprogram spec or body.
807 if Warn_On_Redundant_Constructs then
808 Check_Redundant_Withs (Context_Items (N));
810 if Nkind (Unit_Node) = N_Package_Body then
811 Check_Redundant_Withs
812 (Context_Items => Context_Items (N),
813 Spec_Context_Items => Context_Items (Lib_Unit));
817 -- The above call might have made Unit_Node an N_Subprogram_Body
818 -- from something else, so propagate any Acts_As_Spec flag.
820 if Nkind (Unit_Node) = N_Subprogram_Body
821 and then Acts_As_Spec (Unit_Node)
823 Set_Acts_As_Spec (N);
826 -- Register predefined units in Rtsfind
829 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
831 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
832 Set_RTU_Loaded (Unit_Node);
836 -- Treat compilation unit pragmas that appear after the library unit
838 if Present (Pragmas_After (Aux_Decls_Node (N))) then
840 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
842 while Present (Prag_Node) loop
849 -- Generate distribution stubs if requested and no error
852 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
854 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
855 and then not Fatal_Error (Main_Unit)
857 if Is_RCI_Pkg_Spec_Or_Body (N) then
859 -- Regular RCI package
861 Add_Stub_Constructs (N);
863 elsif (Nkind (Unit_Node) = N_Package_Declaration
864 and then Is_Shared_Passive (Defining_Entity
865 (Specification (Unit_Node))))
866 or else (Nkind (Unit_Node) = N_Package_Body
868 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
870 -- Shared passive package
872 Add_Stub_Constructs (N);
874 elsif Nkind (Unit_Node) = N_Package_Instantiation
876 Is_Remote_Call_Interface
877 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
879 -- Instantiation of a RCI generic package
881 Add_Stub_Constructs (N);
886 if Nkind (Unit_Node) = N_Package_Declaration
887 or else Nkind (Unit_Node) in N_Generic_Declaration
888 or else Nkind (Unit_Node) = N_Package_Renaming_Declaration
889 or else Nkind (Unit_Node) = N_Subprogram_Declaration
891 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
893 -- If the unit is an instantiation whose body will be elaborated
894 -- for inlining purposes, use the the proper entity of the instance.
896 elsif Nkind (Unit_Node) = N_Package_Instantiation
897 and then not Error_Posted (Unit_Node)
899 Remove_Unit_From_Visibility
900 (Defining_Entity (Instance_Spec (Unit_Node)));
902 elsif Nkind (Unit_Node) = N_Package_Body
903 or else (Nkind (Unit_Node) = N_Subprogram_Body
904 and then not Acts_As_Spec (Unit_Node))
906 -- Bodies that are not the main unit are compiled if they
907 -- are generic or contain generic or inlined units. Their
908 -- analysis brings in the context of the corresponding spec
909 -- (unit declaration) which must be removed as well, to
910 -- return the compilation environment to its proper state.
912 Remove_Context (Lib_Unit);
913 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
916 -- Last step is to deinstall the context we just installed
917 -- as well as the unit just compiled.
921 -- If this is the main unit and we are generating code, we must
922 -- check that all generic units in the context have a body if they
923 -- need it, even if they have not been instantiated. In the absence
924 -- of .ali files for generic units, we must force the load of the body,
925 -- just to produce the proper error if the body is absent. We skip this
926 -- verification if the main unit itself is generic.
928 if Get_Cunit_Unit_Number (N) = Main_Unit
929 and then Operating_Mode = Generate_Code
930 and then Expander_Active
932 -- Check whether the source for the body of the unit must be
933 -- included in a standalone library.
935 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
937 -- Indicate that the main unit is now analyzed, to catch possible
938 -- circularities between it and generic bodies. Remove main unit
939 -- from visibility. This might seem superfluous, but the main unit
940 -- must not be visible in the generic body expansions that follow.
942 Set_Analyzed (N, True);
943 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
948 Un : Unit_Number_Type;
950 Save_Style_Check : constant Boolean := Style_Check;
951 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
952 Cunit_Boolean_Restrictions_Save;
955 Item := First (Context_Items (N));
956 while Present (Item) loop
958 -- Check for explicit with clause
960 if Nkind (Item) = N_With_Clause
961 and then not Implicit_With (Item)
963 -- Ada 2005 (AI-50217): Ignore limited-withed units
965 and then not Limited_Present (Item)
967 Nam := Entity (Name (Item));
969 if (Is_Generic_Subprogram (Nam)
970 and then not Is_Intrinsic_Subprogram (Nam))
971 or else (Ekind (Nam) = E_Generic_Package
972 and then Unit_Requires_Body (Nam))
974 Style_Check := False;
976 if Present (Renamed_Object (Nam)) then
979 (Load_Name => Get_Body_Name
981 (Unit_Declaration_Node
982 (Renamed_Object (Nam)))),
990 (Load_Name => Get_Body_Name
991 (Get_Unit_Name (Item)),
1000 ("body of generic unit& not found", Item, Nam);
1003 elsif not Analyzed (Cunit (Un))
1004 and then Un /= Main_Unit
1005 and then not Fatal_Error (Un)
1007 Style_Check := False;
1008 Semantics (Cunit (Un));
1016 Style_Check := Save_Style_Check;
1017 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1021 -- Deal with creating elaboration Boolean if needed. We create an
1022 -- elaboration boolean only for units that come from source since
1023 -- units manufactured by the compiler never need elab checks.
1025 if Comes_From_Source (N)
1027 (Nkind (Unit (N)) = N_Package_Declaration or else
1028 Nkind (Unit (N)) = N_Generic_Package_Declaration or else
1029 Nkind (Unit (N)) = N_Subprogram_Declaration or else
1030 Nkind (Unit (N)) = N_Generic_Subprogram_Declaration)
1033 Loc : constant Source_Ptr := Sloc (N);
1034 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1037 Spec_Id := Defining_Entity (Unit (N));
1038 Generate_Definition (Spec_Id);
1040 -- See if an elaboration entity is required for possible
1041 -- access before elaboration checking. Note that we must
1042 -- allow for this even if -gnatE is not set, since a client
1043 -- may be compiled in -gnatE mode and reference the entity.
1045 -- Case of units which do not require elaboration checks
1048 -- Pure units do not need checks
1052 -- Preelaborated units do not need checks
1054 or else Is_Preelaborated (Spec_Id)
1056 -- No checks needed if pagma Elaborate_Body present
1058 or else Has_Pragma_Elaborate_Body (Spec_Id)
1060 -- No checks needed if unit does not require a body
1062 or else not Unit_Requires_Body (Spec_Id)
1064 -- No checks needed for predefined files
1066 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1068 -- No checks required if no separate spec
1070 or else Acts_As_Spec (N)
1072 -- This is a case where we only need the entity for
1073 -- checking to prevent multiple elaboration checks.
1075 Set_Elaboration_Entity_Required (Spec_Id, False);
1077 -- Case of elaboration entity is required for access before
1078 -- elaboration checking (so certainly we must build it!)
1081 Set_Elaboration_Entity_Required (Spec_Id, True);
1084 Build_Elaboration_Entity (N, Spec_Id);
1088 -- Freeze the compilation unit entity. This for sure is needed because
1089 -- of some warnings that can be output (see Freeze_Subprogram), but may
1090 -- in general be required. If freezing actions result, place them in the
1091 -- compilation unit actions list, and analyze them.
1094 Loc : constant Source_Ptr := Sloc (N);
1095 L : constant List_Id :=
1096 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), Loc);
1098 while Is_Non_Empty_List (L) loop
1099 Insert_Library_Level_Action (Remove_Head (L));
1105 if Nkind (Unit_Node) = N_Package_Declaration
1106 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1107 and then Expander_Active
1110 Save_Style_Check : constant Boolean := Style_Check;
1111 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1112 Options : Style_Check_Options;
1115 Save_Style_Check_Options (Options);
1116 Reset_Style_Check_Options;
1117 Opt.Warning_Mode := Suppress;
1118 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1120 Reset_Style_Check_Options;
1121 Set_Style_Check_Options (Options);
1122 Style_Check := Save_Style_Check;
1123 Warning_Mode := Save_Warning;
1127 -- If we are generating obsolescent warnings, then here is where we
1128 -- generate them for the with'ed items. The reason for this special
1129 -- processing is that the normal mechanism of generating the warnings
1130 -- for referenced entities does not work for context clause references.
1131 -- That's because when we first analyze the context, it is too early to
1132 -- know if the with'ing unit is itself obsolescent (which suppresses
1135 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1137 -- Push current compilation unit as scope, so that the test for
1138 -- being within an obsolescent unit will work correctly.
1140 New_Scope (Defining_Entity (Unit (N)));
1142 -- Loop through context items to deal with with clauses
1150 Item := First (Context_Items (N));
1151 while Present (Item) loop
1152 if Nkind (Item) = N_With_Clause then
1154 Ent := Entity (Nam);
1156 if Is_Obsolescent (Ent) then
1157 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1165 -- Remove temporary install of current unit as scope
1169 end Analyze_Compilation_Unit;
1171 ---------------------
1172 -- Analyze_Context --
1173 ---------------------
1175 procedure Analyze_Context (N : Node_Id) is
1176 Ukind : constant Node_Kind := Nkind (Unit (N));
1180 -- First process all configuration pragmas at the start of the context
1181 -- items. Strictly these are not part of the context clause, but that
1182 -- is where the parser puts them. In any case for sure we must analyze
1183 -- these before analyzing the actual context items, since they can have
1184 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1185 -- be with'ed as a result of changing categorizations in Ada 2005).
1187 Item := First (Context_Items (N));
1188 while Present (Item)
1189 and then Nkind (Item) = N_Pragma
1190 and then Chars (Item) in Configuration_Pragma_Names
1196 -- Loop through actual context items. This is done in two passes:
1198 -- a) The first pass analyzes non-limited with-clauses and also any
1199 -- configuration pragmas (we need to get the latter analyzed right
1200 -- away, since they can affect processing of subsequent items.
1202 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1204 while Present (Item) loop
1206 -- For with clause, analyze the with clause, and then update
1207 -- the version, since we are dependent on a unit that we with.
1209 if Nkind (Item) = N_With_Clause
1210 and then not Limited_Present (Item)
1212 -- Skip analyzing with clause if no unit, nothing to do (this
1213 -- happens for a with that references a non-existant unit)
1215 if Present (Library_Unit (Item)) then
1219 if not Implicit_With (Item) then
1220 Version_Update (N, Library_Unit (Item));
1223 -- Skip pragmas. Configuration pragmas at the start were handled in
1224 -- the loop above, and remaining pragmas are not processed until we
1225 -- actually install the context (see Install_Context). We delay the
1226 -- analysis of these pragmas to make sure that we have installed all
1227 -- the implicit with's on parent units.
1229 -- Skip use clauses at this stage, since we don't want to do any
1230 -- installing of potentially use visible entities until we we
1231 -- actually install the complete context (in Install_Context).
1232 -- Otherwise things can get installed in the wrong context.
1241 -- Second pass: examine all limited_with clauses. All other context
1242 -- items are ignored in this pass.
1244 Item := First (Context_Items (N));
1245 while Present (Item) loop
1246 if Nkind (Item) = N_With_Clause
1247 and then Limited_Present (Item)
1249 -- No need to check errors on implicitly generated limited-with
1252 if not Implicit_With (Item) then
1254 -- Check compilation unit containing the limited-with clause
1256 if Ukind /= N_Package_Declaration
1257 and then Ukind /= N_Subprogram_Declaration
1258 and then Ukind /= N_Package_Renaming_Declaration
1259 and then Ukind /= N_Subprogram_Renaming_Declaration
1260 and then Ukind not in N_Generic_Declaration
1261 and then Ukind not in N_Generic_Renaming_Declaration
1262 and then Ukind not in N_Generic_Instantiation
1264 Error_Msg_N ("limited with_clause not allowed here", Item);
1266 -- Check wrong use of a limited with clause applied to the
1267 -- compilation unit containing the limited-with clause.
1269 -- limited with P.Q;
1270 -- package P.Q is ...
1272 elsif Unit (Library_Unit (Item)) = Unit (N) then
1273 Error_Msg_N ("wrong use of limited-with clause", Item);
1275 -- Check wrong use of limited-with clause applied to some
1276 -- immediate ancestor.
1278 elsif Is_Child_Spec (Unit (N)) then
1280 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1284 P := Parent_Spec (Unit (N));
1286 if Unit (P) = Lib_U then
1287 Error_Msg_N ("limited with_clause of immediate "
1288 & "ancestor not allowed", Item);
1292 exit when not Is_Child_Spec (Unit (P));
1293 P := Parent_Spec (Unit (P));
1298 -- Check if the limited-withed unit is already visible through
1299 -- some context clause of the current compilation unit or some
1300 -- ancestor of the current compilation unit.
1303 Lim_Unit_Name : constant Node_Id := Name (Item);
1304 Comp_Unit : Node_Id;
1306 Unit_Name : Node_Id;
1311 It := First (Context_Items (Comp_Unit));
1312 while Present (It) loop
1314 and then Nkind (It) = N_With_Clause
1315 and then not Limited_Present (It)
1317 (Nkind (Unit (Library_Unit (It)))
1318 = N_Package_Declaration
1320 Nkind (Unit (Library_Unit (It)))
1321 = N_Package_Renaming_Declaration)
1323 if Nkind (Unit (Library_Unit (It)))
1324 = N_Package_Declaration
1326 Unit_Name := Name (It);
1328 Unit_Name := Name (Unit (Library_Unit (It)));
1331 -- Check if the named package (or some ancestor)
1332 -- leaves visible the full-view of the unit given
1333 -- in the limited-with clause
1336 if Designate_Same_Unit (Lim_Unit_Name,
1339 Error_Msg_Sloc := Sloc (It);
1341 ("unlimited view visible through the"
1342 & " context clause found #",
1345 ("\simultaneous visibility of the limited"
1346 & " and unlimited views not allowed"
1350 elsif Nkind (Unit_Name) = N_Identifier then
1354 Unit_Name := Prefix (Unit_Name);
1361 exit when not Is_Child_Spec (Unit (Comp_Unit));
1363 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1368 -- Skip analyzing with clause if no unit, see above
1370 if Present (Library_Unit (Item)) then
1374 -- A limited_with does not impose an elaboration order, but
1375 -- there is a semantic dependency for recompilation purposes.
1377 if not Implicit_With (Item) then
1378 Version_Update (N, Library_Unit (Item));
1381 -- Pragmas and use clauses and with clauses other than limited
1382 -- with's are ignored in this pass through the context items.
1390 end Analyze_Context;
1392 -------------------------------
1393 -- Analyze_Package_Body_Stub --
1394 -------------------------------
1396 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1397 Id : constant Entity_Id := Defining_Identifier (N);
1401 -- The package declaration must be in the current declarative part
1403 Check_Stub_Level (N);
1404 Nam := Current_Entity_In_Scope (Id);
1406 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1407 Error_Msg_N ("missing specification for package stub", N);
1409 elsif Has_Completion (Nam)
1410 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1412 Error_Msg_N ("duplicate or redundant stub for package", N);
1415 -- Indicate that the body of the package exists. If we are doing
1416 -- only semantic analysis, the stub stands for the body. If we are
1417 -- generating code, the existence of the body will be confirmed
1418 -- when we load the proper body.
1420 Set_Has_Completion (Nam);
1421 Set_Scope (Defining_Entity (N), Current_Scope);
1422 Generate_Reference (Nam, Id, 'b');
1423 Analyze_Proper_Body (N, Nam);
1425 end Analyze_Package_Body_Stub;
1427 -------------------------
1428 -- Analyze_Proper_Body --
1429 -------------------------
1431 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1432 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1433 Unum : Unit_Number_Type;
1435 procedure Optional_Subunit;
1436 -- This procedure is called when the main unit is a stub, or when we
1437 -- are not generating code. In such a case, we analyze the subunit if
1438 -- present, which is user-friendly and in fact required for ASIS, but
1439 -- we don't complain if the subunit is missing.
1441 ----------------------
1442 -- Optional_Subunit --
1443 ----------------------
1445 procedure Optional_Subunit is
1446 Comp_Unit : Node_Id;
1449 -- Try to load subunit, but ignore any errors that occur during
1450 -- the loading of the subunit, by using the special feature in
1451 -- Errout to ignore all errors. Note that Fatal_Error will still
1452 -- be set, so we will be able to check for this case below.
1454 if not ASIS_Mode then
1455 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1460 (Load_Name => Subunit_Name,
1465 if not ASIS_Mode then
1466 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1469 -- All done if we successfully loaded the subunit
1472 and then (not Fatal_Error (Unum) or else Try_Semantics)
1474 Comp_Unit := Cunit (Unum);
1476 -- If the file was empty or seriously mangled, the unit
1477 -- itself may be missing.
1479 if No (Unit (Comp_Unit)) then
1481 ("subunit does not contain expected proper body", N);
1483 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1485 ("expected SEPARATE subunit, found child unit",
1486 Cunit_Entity (Unum));
1488 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1489 Analyze_Subunit (Comp_Unit);
1490 Set_Library_Unit (N, Comp_Unit);
1493 elsif Unum = No_Unit
1494 and then Present (Nam)
1496 if Is_Protected_Type (Nam) then
1497 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1499 Set_Corresponding_Body (
1500 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1503 end Optional_Subunit;
1505 -- Start of processing for Analyze_Proper_Body
1508 -- If the subunit is already loaded, it means that the main unit
1509 -- is a subunit, and that the current unit is one of its parents
1510 -- which was being analyzed to provide the needed context for the
1511 -- analysis of the subunit. In this case we analyze the subunit and
1512 -- continue with the parent, without looking a subsequent subunits.
1514 if Is_Loaded (Subunit_Name) then
1516 -- If the proper body is already linked to the stub node,
1517 -- the stub is in a generic unit and just needs analyzing.
1519 if Present (Library_Unit (N)) then
1520 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1521 Analyze_Subunit (Library_Unit (N));
1523 -- Otherwise we must load the subunit and link to it
1526 -- Load the subunit, this must work, since we originally
1527 -- loaded the subunit earlier on. So this will not really
1528 -- load it, just give access to it.
1532 (Load_Name => Subunit_Name,
1537 -- And analyze the subunit in the parent context (note that we
1538 -- do not call Semantics, since that would remove the parent
1539 -- context). Because of this, we have to manually reset the
1540 -- compiler state to Analyzing since it got destroyed by Load.
1542 if Unum /= No_Unit then
1543 Compiler_State := Analyzing;
1545 -- Check that the proper body is a subunit and not a child
1546 -- unit. If the unit was previously loaded, the error will
1547 -- have been emitted when copying the generic node, so we
1548 -- just return to avoid cascaded errors.
1550 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1554 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1555 Analyze_Subunit (Cunit (Unum));
1556 Set_Library_Unit (N, Cunit (Unum));
1560 -- If the main unit is a subunit, then we are just performing semantic
1561 -- analysis on that subunit, and any other subunits of any parent unit
1562 -- should be ignored, except that if we are building trees for ASIS
1563 -- usage we want to annotate the stub properly.
1565 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1566 and then Subunit_Name /= Unit_Name (Main_Unit)
1572 -- But before we return, set the flag for unloaded subunits. This
1573 -- will suppress junk warnings of variables in the same declarative
1574 -- part (or a higher level one) that are in danger of looking unused
1575 -- when in fact there might be a declaration in the subunit that we
1576 -- do not intend to load.
1578 Unloaded_Subunits := True;
1581 -- If the subunit is not already loaded, and we are generating code,
1582 -- then this is the case where compilation started from the parent,
1583 -- and we are generating code for an entire subunit tree. In that
1584 -- case we definitely need to load the subunit.
1586 -- In order to continue the analysis with the rest of the parent,
1587 -- and other subunits, we load the unit without requiring its
1588 -- presence, and emit a warning if not found, rather than terminating
1589 -- the compilation abruptly, as for other missing file problems.
1591 elsif Original_Operating_Mode = Generate_Code then
1593 -- If the proper body is already linked to the stub node,
1594 -- the stub is in a generic unit and just needs analyzing.
1596 -- We update the version. Although we are not technically
1597 -- semantically dependent on the subunit, given our approach
1598 -- of macro substitution of subunits, it makes sense to
1599 -- include it in the version identification.
1601 if Present (Library_Unit (N)) then
1602 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1603 Analyze_Subunit (Library_Unit (N));
1604 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1606 -- Otherwise we must load the subunit and link to it
1611 (Load_Name => Subunit_Name,
1616 if Original_Operating_Mode = Generate_Code
1617 and then Unum = No_Unit
1619 Error_Msg_Name_1 := Subunit_Name;
1621 Get_File_Name (Subunit_Name, Subunit => True);
1623 ("subunit% in file{ not found?", N);
1624 Subunits_Missing := True;
1627 -- Load_Unit may reset Compiler_State, since it may have been
1628 -- necessary to parse an additional units, so we make sure
1629 -- that we reset it to the Analyzing state.
1631 Compiler_State := Analyzing;
1633 if Unum /= No_Unit then
1634 if Debug_Flag_L then
1635 Write_Str ("*** Loaded subunit from stub. Analyze");
1640 Comp_Unit : constant Node_Id := Cunit (Unum);
1643 -- Check for child unit instead of subunit
1645 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1647 ("expected SEPARATE subunit, found child unit",
1648 Cunit_Entity (Unum));
1650 -- OK, we have a subunit
1653 -- Set corresponding stub (even if errors)
1655 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1657 -- Analyze the unit if semantics active
1659 if not Fatal_Error (Unum) or else Try_Semantics then
1660 Analyze_Subunit (Comp_Unit);
1663 -- Set the library unit pointer in any case
1665 Set_Library_Unit (N, Comp_Unit);
1667 -- We update the version. Although we are not technically
1668 -- semantically dependent on the subunit, given our
1669 -- approach of macro substitution of subunits, it makes
1670 -- sense to include it in the version identification.
1672 Version_Update (Cunit (Main_Unit), Comp_Unit);
1678 -- The remaining case is when the subunit is not already loaded and
1679 -- we are not generating code. In this case we are just performing
1680 -- semantic analysis on the parent, and we are not interested in
1681 -- the subunit. For subprograms, analyze the stub as a body. For
1682 -- other entities the stub has already been marked as completed.
1688 end Analyze_Proper_Body;
1690 ----------------------------------
1691 -- Analyze_Protected_Body_Stub --
1692 ----------------------------------
1694 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1695 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1698 Check_Stub_Level (N);
1700 -- First occurence of name may have been as an incomplete type
1702 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1703 Nam := Full_View (Nam);
1707 or else not Is_Protected_Type (Etype (Nam))
1709 Error_Msg_N ("missing specification for Protected body", N);
1711 Set_Scope (Defining_Entity (N), Current_Scope);
1712 Set_Has_Completion (Etype (Nam));
1713 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1714 Analyze_Proper_Body (N, Etype (Nam));
1716 end Analyze_Protected_Body_Stub;
1718 ----------------------------------
1719 -- Analyze_Subprogram_Body_Stub --
1720 ----------------------------------
1722 -- A subprogram body stub can appear with or without a previous
1723 -- specification. If there is one, the analysis of the body will
1724 -- find it and verify conformance. The formals appearing in the
1725 -- specification of the stub play no role, except for requiring an
1726 -- additional conformance check. If there is no previous subprogram
1727 -- declaration, the stub acts as a spec, and provides the defining
1728 -- entity for the subprogram.
1730 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1734 Check_Stub_Level (N);
1736 -- Verify that the identifier for the stub is unique within this
1737 -- declarative part.
1739 if Nkind (Parent (N)) = N_Block_Statement
1740 or else Nkind (Parent (N)) = N_Package_Body
1741 or else Nkind (Parent (N)) = N_Subprogram_Body
1743 Decl := First (Declarations (Parent (N)));
1744 while Present (Decl)
1747 if Nkind (Decl) = N_Subprogram_Body_Stub
1748 and then (Chars (Defining_Unit_Name (Specification (Decl)))
1749 = Chars (Defining_Unit_Name (Specification (N))))
1751 Error_Msg_N ("identifier for stub is not unique", N);
1758 -- Treat stub as a body, which checks conformance if there is a previous
1759 -- declaration, or else introduces entity and its signature.
1761 Analyze_Subprogram_Body (N);
1762 Analyze_Proper_Body (N, Empty);
1763 end Analyze_Subprogram_Body_Stub;
1765 ---------------------
1766 -- Analyze_Subunit --
1767 ---------------------
1769 -- A subunit is compiled either by itself (for semantic checking)
1770 -- or as part of compiling the parent (for code generation). In
1771 -- either case, by the time we actually process the subunit, the
1772 -- parent has already been installed and analyzed. The node N is
1773 -- a compilation unit, whose context needs to be treated here,
1774 -- because we come directly here from the parent without calling
1775 -- Analyze_Compilation_Unit.
1777 -- The compilation context includes the explicit context of the
1778 -- subunit, and the context of the parent, together with the parent
1779 -- itself. In order to compile the current context, we remove the
1780 -- one inherited from the parent, in order to have a clean visibility
1781 -- table. We restore the parent context before analyzing the proper
1782 -- body itself. On exit, we remove only the explicit context of the
1785 procedure Analyze_Subunit (N : Node_Id) is
1786 Lib_Unit : constant Node_Id := Library_Unit (N);
1787 Par_Unit : constant Entity_Id := Current_Scope;
1789 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1790 Num_Scopes : Int := 0;
1791 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1792 Enclosing_Child : Entity_Id := Empty;
1793 Svg : constant Suppress_Array := Scope_Suppress;
1795 procedure Analyze_Subunit_Context;
1796 -- Capture names in use clauses of the subunit. This must be done
1797 -- before re-installing parent declarations, because items in the
1798 -- context must not be hidden by declarations local to the parent.
1800 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1801 -- Recursive procedure to restore scope of all ancestors of subunit,
1802 -- from outermost in. If parent is not a subunit, the call to install
1803 -- context installs context of spec and (if parent is a child unit)
1804 -- the context of its parents as well. It is confusing that parents
1805 -- should be treated differently in both cases, but the semantics are
1806 -- just not identical.
1808 procedure Re_Install_Use_Clauses;
1809 -- As part of the removal of the parent scope, the use clauses are
1810 -- removed, to be reinstalled when the context of the subunit has
1811 -- been analyzed. Use clauses may also have been affected by the
1812 -- analysis of the context of the subunit, so they have to be applied
1813 -- again, to insure that the compilation environment of the rest of
1814 -- the parent unit is identical.
1816 procedure Remove_Scope;
1817 -- Remove current scope from scope stack, and preserve the list
1818 -- of use clauses in it, to be reinstalled after context is analyzed.
1820 -----------------------------
1821 -- Analyze_Subunit_Context --
1822 -----------------------------
1824 procedure Analyze_Subunit_Context is
1827 Unit_Name : Entity_Id;
1830 Analyze_Context (N);
1832 -- Make withed units immediately visible. If child unit, make the
1833 -- ultimate parent immediately visible.
1835 Item := First (Context_Items (N));
1836 while Present (Item) loop
1837 if Nkind (Item) = N_With_Clause then
1839 -- Protect frontend against previous errors in context clauses
1841 if Nkind (Name (Item)) /= N_Selected_Component then
1842 Unit_Name := Entity (Name (Item));
1843 while Is_Child_Unit (Unit_Name) loop
1844 Set_Is_Visible_Child_Unit (Unit_Name);
1845 Unit_Name := Scope (Unit_Name);
1848 if not Is_Immediately_Visible (Unit_Name) then
1849 Set_Is_Immediately_Visible (Unit_Name);
1850 Set_Context_Installed (Item);
1854 elsif Nkind (Item) = N_Use_Package_Clause then
1855 Nam := First (Names (Item));
1856 while Present (Nam) loop
1861 elsif Nkind (Item) = N_Use_Type_Clause then
1862 Nam := First (Subtype_Marks (Item));
1863 while Present (Nam) loop
1872 -- Reset visibility of withed units. They will be made visible
1873 -- again when we install the subunit context.
1875 Item := First (Context_Items (N));
1876 while Present (Item) loop
1877 if Nkind (Item) = N_With_Clause
1879 -- Protect frontend against previous errors in context clauses
1881 and then Nkind (Name (Item)) /= N_Selected_Component
1883 Unit_Name := Entity (Name (Item));
1884 while Is_Child_Unit (Unit_Name) loop
1885 Set_Is_Visible_Child_Unit (Unit_Name, False);
1886 Unit_Name := Scope (Unit_Name);
1889 if Context_Installed (Item) then
1890 Set_Is_Immediately_Visible (Unit_Name, False);
1891 Set_Context_Installed (Item, False);
1897 end Analyze_Subunit_Context;
1899 ------------------------
1900 -- Re_Install_Parents --
1901 ------------------------
1903 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
1907 if Nkind (Unit (L)) = N_Subunit then
1908 Re_Install_Parents (Library_Unit (L), Scope (Scop));
1911 Install_Context (L);
1913 -- If the subunit occurs within a child unit, we must restore the
1914 -- immediate visibility of any siblings that may occur in context.
1916 if Present (Enclosing_Child) then
1917 Install_Siblings (Enclosing_Child, L);
1922 if Scop /= Par_Unit then
1923 Set_Is_Immediately_Visible (Scop);
1926 -- Make entities in scope visible again. For child units, restore
1927 -- visibility only if they are actually in context.
1929 E := First_Entity (Current_Scope);
1930 while Present (E) loop
1931 if not Is_Child_Unit (E)
1932 or else Is_Visible_Child_Unit (E)
1934 Set_Is_Immediately_Visible (E);
1940 -- A subunit appears within a body, and for a nested subunits
1941 -- all the parents are bodies. Restore full visibility of their
1942 -- private entities.
1944 if Ekind (Scop) = E_Package then
1945 Set_In_Package_Body (Scop);
1946 Install_Private_Declarations (Scop);
1948 end Re_Install_Parents;
1950 ----------------------------
1951 -- Re_Install_Use_Clauses --
1952 ----------------------------
1954 procedure Re_Install_Use_Clauses is
1957 for J in reverse 1 .. Num_Scopes loop
1958 U := Use_Clauses (J);
1959 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
1960 Install_Use_Clauses (U, Force_Installation => True);
1962 end Re_Install_Use_Clauses;
1968 procedure Remove_Scope is
1972 Num_Scopes := Num_Scopes + 1;
1973 Use_Clauses (Num_Scopes) :=
1974 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
1976 E := First_Entity (Current_Scope);
1977 while Present (E) loop
1978 Set_Is_Immediately_Visible (E, False);
1982 if Is_Child_Unit (Current_Scope) then
1983 Enclosing_Child := Current_Scope;
1989 -- Start of processing for Analyze_Subunit
1992 if not Is_Empty_List (Context_Items (N)) then
1994 -- Save current use clauses
1997 Remove_Context (Lib_Unit);
1999 -- Now remove parents and their context, including enclosing
2000 -- subunits and the outer parent body which is not a subunit.
2002 if Present (Lib_Spec) then
2003 Remove_Context (Lib_Spec);
2005 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2006 Lib_Spec := Library_Unit (Lib_Spec);
2008 Remove_Context (Lib_Spec);
2011 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2015 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2016 Remove_Context (Library_Unit (Lib_Spec));
2020 Set_Is_Immediately_Visible (Par_Unit, False);
2022 Analyze_Subunit_Context;
2024 Re_Install_Parents (Lib_Unit, Par_Unit);
2025 Set_Is_Immediately_Visible (Par_Unit);
2027 -- If the context includes a child unit of the parent of the
2028 -- subunit, the parent will have been removed from visibility,
2029 -- after compiling that cousin in the context. The visibility
2030 -- of the parent must be restored now. This also applies if the
2031 -- context includes another subunit of the same parent which in
2032 -- turn includes a child unit in its context.
2034 if Ekind (Par_Unit) = E_Package then
2035 if not Is_Immediately_Visible (Par_Unit)
2036 or else (Present (First_Entity (Par_Unit))
2037 and then not Is_Immediately_Visible
2038 (First_Entity (Par_Unit)))
2040 Set_Is_Immediately_Visible (Par_Unit);
2041 Install_Visible_Declarations (Par_Unit);
2042 Install_Private_Declarations (Par_Unit);
2046 Re_Install_Use_Clauses;
2047 Install_Context (N);
2049 -- Restore state of suppress flags for current body
2051 Scope_Suppress := Svg;
2053 -- If the subunit is within a child unit, then siblings of any
2054 -- parent unit that appear in the context clause of the subunit
2055 -- must also be made immediately visible.
2057 if Present (Enclosing_Child) then
2058 Install_Siblings (Enclosing_Child, N);
2063 Analyze (Proper_Body (Unit (N)));
2066 -- The subunit may contain a with_clause on a sibling of some
2067 -- ancestor. Removing the context will remove from visibility those
2068 -- ancestor child units, which must be restored to the visibility
2069 -- they have in the enclosing body.
2071 if Present (Enclosing_Child) then
2077 and then Is_Child_Unit (C)
2079 Set_Is_Immediately_Visible (C);
2080 Set_Is_Visible_Child_Unit (C);
2085 end Analyze_Subunit;
2087 ----------------------------
2088 -- Analyze_Task_Body_Stub --
2089 ----------------------------
2091 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2092 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2093 Loc : constant Source_Ptr := Sloc (N);
2096 Check_Stub_Level (N);
2098 -- First occurence of name may have been as an incomplete type
2100 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2101 Nam := Full_View (Nam);
2105 or else not Is_Task_Type (Etype (Nam))
2107 Error_Msg_N ("missing specification for task body", N);
2109 Set_Scope (Defining_Entity (N), Current_Scope);
2110 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2111 Set_Has_Completion (Etype (Nam));
2112 Analyze_Proper_Body (N, Etype (Nam));
2114 -- Set elaboration flag to indicate that entity is callable.
2115 -- This cannot be done in the expansion of the body itself,
2116 -- because the proper body is not in a declarative part. This
2117 -- is only done if expansion is active, because the context
2118 -- may be generic and the flag not defined yet.
2120 if Expander_Active then
2122 Make_Assignment_Statement (Loc,
2124 Make_Identifier (Loc,
2125 New_External_Name (Chars (Etype (Nam)), 'E')),
2126 Expression => New_Reference_To (Standard_True, Loc)));
2130 end Analyze_Task_Body_Stub;
2132 -------------------------
2133 -- Analyze_With_Clause --
2134 -------------------------
2136 -- Analyze the declaration of a unit in a with clause. At end,
2137 -- label the with clause with the defining entity for the unit.
2139 procedure Analyze_With_Clause (N : Node_Id) is
2141 -- Retrieve the original kind of the unit node, before analysis.
2142 -- If it is a subprogram instantiation, its analysis below will
2143 -- rewrite as the declaration of the wrapper package. If the same
2144 -- instantiation appears indirectly elsewhere in the context, it
2145 -- will have been analyzed already.
2147 Unit_Kind : constant Node_Kind :=
2148 Nkind (Original_Node (Unit (Library_Unit (N))));
2151 Par_Name : Entity_Id;
2156 -- Set True if the unit currently being compiled is an internal unit
2158 Save_Style_Check : constant Boolean := Opt.Style_Check;
2159 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
2160 Cunit_Boolean_Restrictions_Save;
2163 if Limited_Present (N) then
2165 -- Ada 2005 (AI-50217): Build visibility structures but do not
2168 Build_Limited_Views (N);
2172 -- We reset ordinary style checking during the analysis of a with'ed
2173 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2174 -- definitely *does* apply to with'ed units).
2176 if not GNAT_Mode then
2177 Style_Check := False;
2180 -- If the library unit is a predefined unit, and we are in high
2181 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2182 -- for the analysis of the with'ed unit. This mode does not prevent
2183 -- explicit with'ing of run-time units.
2185 if Configurable_Run_Time_Mode
2187 Is_Predefined_File_Name
2188 (Unit_File_Name (Get_Source_Unit (Unit (Library_Unit (N)))))
2190 Configurable_Run_Time_Mode := False;
2191 Semantics (Library_Unit (N));
2192 Configurable_Run_Time_Mode := True;
2195 Semantics (Library_Unit (N));
2198 U := Unit (Library_Unit (N));
2199 Check_Restriction_No_Dependence (Name (N), N);
2200 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2202 -- Following checks are skipped for dummy packages (those supplied
2203 -- for with's where no matching file could be found). Such packages
2204 -- are identified by the Sloc value being set to No_Location
2206 if Sloc (U) /= No_Location then
2208 -- Check restrictions, except that we skip the check if this
2209 -- is an internal unit unless we are compiling the internal
2210 -- unit as the main unit. We also skip this for dummy packages.
2212 if not Intunit or else Current_Sem_Unit = Main_Unit then
2213 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2216 -- Check for inappropriate with of internal implementation unit
2217 -- if we are currently compiling the main unit and the main unit
2218 -- is itself not an internal unit. We do not issue this message
2219 -- for implicit with's generated by the compiler itself.
2221 if Implementation_Unit_Warnings
2222 and then Current_Sem_Unit = Main_Unit
2223 and then not Intunit
2224 and then not Implicit_With (N)
2225 and then not GNAT_Mode
2228 U_Kind : constant Kind_Of_Unit :=
2229 Get_Kind_Of_Unit (Get_Source_Unit (U));
2232 if U_Kind = Implementation_Unit then
2233 Error_Msg_N ("& is an internal 'G'N'A'T unit?", Name (N));
2235 ("\use of this unit is non-portable " &
2236 "and version-dependent?",
2239 elsif U_Kind = Ada_05_Unit
2240 and then Ada_Version < Ada_05
2241 and then Warn_On_Ada_2005_Compatibility
2243 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2249 -- Semantic analysis of a generic unit is performed on a copy of
2250 -- the original tree. Retrieve the entity on which semantic info
2251 -- actually appears.
2253 if Unit_Kind in N_Generic_Declaration then
2254 E_Name := Defining_Entity (U);
2256 -- Note: in the following test, Unit_Kind is the original Nkind, but
2257 -- in the case of an instantiation, semantic analysis above will
2258 -- have replaced the unit by its instantiated version. If the instance
2259 -- body has been generated, the instance now denotes the body entity.
2260 -- For visibility purposes we need the entity of its spec.
2262 elsif (Unit_Kind = N_Package_Instantiation
2263 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2264 N_Package_Instantiation)
2265 and then Nkind (U) = N_Package_Body
2267 E_Name := Corresponding_Spec (U);
2269 elsif Unit_Kind = N_Package_Instantiation
2270 and then Nkind (U) = N_Package_Instantiation
2272 -- If the instance has not been rewritten as a package declaration,
2273 -- then it appeared already in a previous with clause. Retrieve
2274 -- the entity from the previous instance.
2276 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2278 elsif Unit_Kind in N_Subprogram_Instantiation then
2280 -- Instantiation node is replaced with a wrapper package.
2281 -- Retrieve the visible subprogram created by the instance from
2282 -- the corresponding attribute of the wrapper.
2284 E_Name := Related_Instance (Defining_Entity (U));
2286 elsif Unit_Kind = N_Package_Renaming_Declaration
2287 or else Unit_Kind in N_Generic_Renaming_Declaration
2289 E_Name := Defining_Entity (U);
2291 elsif Unit_Kind = N_Subprogram_Body
2292 and then Nkind (Name (N)) = N_Selected_Component
2293 and then not Acts_As_Spec (Library_Unit (N))
2295 -- For a child unit that has no spec, one has been created and
2296 -- analyzed. The entity required is that of the spec.
2298 E_Name := Corresponding_Spec (U);
2301 E_Name := Defining_Entity (U);
2304 if Nkind (Name (N)) = N_Selected_Component then
2306 -- Child unit in a with clause
2308 Change_Selected_Component_To_Expanded_Name (Name (N));
2311 -- Restore style checks and restrictions
2313 Style_Check := Save_Style_Check;
2314 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2316 -- Record the reference, but do NOT set the unit as referenced, we want
2317 -- to consider the unit as unreferenced if this is the only reference
2320 Set_Entity_With_Style_Check (Name (N), E_Name);
2321 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2323 if Is_Child_Unit (E_Name) then
2324 Pref := Prefix (Name (N));
2325 Par_Name := Scope (E_Name);
2326 while Nkind (Pref) = N_Selected_Component loop
2327 Change_Selected_Component_To_Expanded_Name (Pref);
2328 Set_Entity_With_Style_Check (Pref, Par_Name);
2330 Generate_Reference (Par_Name, Pref);
2331 Pref := Prefix (Pref);
2333 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2334 -- is set to Standard_Standard, and no attempt should be made to
2335 -- further unwind scopes.
2337 if Par_Name /= Standard_Standard then
2338 Par_Name := Scope (Par_Name);
2342 if Present (Entity (Pref))
2343 and then not Analyzed (Parent (Parent (Entity (Pref))))
2345 -- If the entity is set without its unit being compiled, the
2346 -- original parent is a renaming, and Par_Name is the renamed
2347 -- entity. For visibility purposes, we need the original entity,
2348 -- which must be analyzed now because Load_Unit directly retrieves
2349 -- the renamed unit, and the renaming declaration itself has not
2352 Analyze (Parent (Parent (Entity (Pref))));
2353 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2354 Par_Name := Entity (Pref);
2357 Set_Entity_With_Style_Check (Pref, Par_Name);
2358 Generate_Reference (Par_Name, Pref);
2361 -- If the withed unit is System, and a system extension pragma is
2362 -- present, compile the extension now, rather than waiting for a
2363 -- visibility check on a specific entity.
2365 if Chars (E_Name) = Name_System
2366 and then Scope (E_Name) = Standard_Standard
2367 and then Present (System_Extend_Unit)
2368 and then Present_System_Aux (N)
2370 -- If the extension is not present, an error will have been emitted
2375 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2376 -- to private_with units; they will be made visible later (just before
2377 -- the private part is analyzed)
2379 if Private_Present (N) then
2380 Set_Is_Immediately_Visible (E_Name, False);
2382 end Analyze_With_Clause;
2384 ------------------------------
2385 -- Analyze_With_Type_Clause --
2386 ------------------------------
2388 procedure Analyze_With_Type_Clause (N : Node_Id) is
2389 Loc : constant Source_Ptr := Sloc (N);
2390 Nam : constant Node_Id := Name (N);
2394 Unum : Unit_Number_Type;
2397 procedure Decorate_Tagged_Type (T : Entity_Id);
2398 -- Set basic attributes of type, including its class_wide type
2400 function In_Chain (E : Entity_Id) return Boolean;
2401 -- Check that the imported type is not already in the homonym chain,
2402 -- for example through a with_type clause in a parent unit.
2404 --------------------------
2405 -- Decorate_Tagged_Type --
2406 --------------------------
2408 procedure Decorate_Tagged_Type (T : Entity_Id) is
2412 Set_Ekind (T, E_Record_Type);
2413 Set_Is_Tagged_Type (T);
2415 Set_From_With_Type (T);
2418 if not In_Chain (T) then
2419 Set_Homonym (T, Current_Entity (T));
2420 Set_Current_Entity (T);
2423 -- Build bogus class_wide type, if not previously done
2425 if No (Class_Wide_Type (T)) then
2426 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S'));
2428 Set_Ekind (CW, E_Class_Wide_Type);
2431 Set_Is_Tagged_Type (CW);
2432 Set_Is_First_Subtype (CW, True);
2433 Init_Size_Align (CW);
2434 Set_Has_Unknown_Discriminants
2436 Set_Class_Wide_Type (CW, CW);
2437 Set_Equivalent_Type (CW, Empty);
2438 Set_From_With_Type (CW);
2440 Set_Class_Wide_Type (T, CW);
2442 end Decorate_Tagged_Type;
2448 function In_Chain (E : Entity_Id) return Boolean is
2452 H := Current_Entity (E);
2453 while Present (H) loop
2464 -- Start of processing for Analyze_With_Type_Clause
2467 if Nkind (Nam) = N_Selected_Component then
2468 Pack := New_Copy_Tree (Prefix (Nam));
2469 Sel := Selector_Name (Nam);
2472 Error_Msg_N ("illegal name for imported type", Nam);
2477 Make_Package_Declaration (Loc,
2479 (Make_Package_Specification (Loc,
2480 Defining_Unit_Name => Pack,
2481 Visible_Declarations => New_List,
2482 End_Label => Empty)));
2486 (Load_Name => Get_Unit_Name (Decl),
2492 or else Nkind (Unit (Cunit (Unum))) /= N_Package_Declaration
2494 Error_Msg_N ("imported type must be declared in package", Nam);
2497 elsif Unum = Current_Sem_Unit then
2499 -- If type is defined in unit being analyzed, then the clause
2505 P := Cunit_Entity (Unum);
2508 -- Find declaration for imported type, and set its basic attributes
2509 -- if it has not been analyzed (which will be the case if there is
2510 -- circular dependence).
2517 if not Analyzed (Cunit (Unum))
2518 and then not From_With_Type (P)
2520 Set_Ekind (P, E_Package);
2521 Set_Etype (P, Standard_Void_Type);
2522 Set_From_With_Type (P);
2523 Set_Scope (P, Standard_Standard);
2524 Set_Homonym (P, Current_Entity (P));
2525 Set_Current_Entity (P);
2527 elsif Analyzed (Cunit (Unum))
2528 and then Is_Child_Unit (P)
2530 -- If the child unit is already in scope, indicate that it is
2531 -- visible, and remains so after intervening calls to rtsfind.
2533 Set_Is_Visible_Child_Unit (P);
2536 if Nkind (Parent (P)) = N_Defining_Program_Unit_Name then
2538 -- Make parent packages visible
2541 Parent_Comp : Node_Id;
2542 Parent_Id : Entity_Id;
2547 Parent_Comp := Parent_Spec (Unit (Cunit (Unum)));
2550 Parent_Id := Defining_Entity (Unit (Parent_Comp));
2551 Set_Scope (Child, Parent_Id);
2553 -- The type may be imported from a child unit, in which
2554 -- case the current compilation appears in the name. Do
2555 -- not change its visibility here because it will conflict
2556 -- with the subsequent normal processing.
2558 if not Analyzed (Unit_Declaration_Node (Parent_Id))
2559 and then Parent_Id /= Cunit_Entity (Current_Sem_Unit)
2561 Set_Ekind (Parent_Id, E_Package);
2562 Set_Etype (Parent_Id, Standard_Void_Type);
2564 -- The same package may appear is several with_type
2567 if not From_With_Type (Parent_Id) then
2568 Set_Homonym (Parent_Id, Current_Entity (Parent_Id));
2569 Set_Current_Entity (Parent_Id);
2570 Set_From_With_Type (Parent_Id);
2574 Set_Is_Immediately_Visible (Parent_Id);
2577 Parent_Comp := Parent_Spec (Unit (Parent_Comp));
2578 exit when No (Parent_Comp);
2581 Set_Scope (Parent_Id, Standard_Standard);
2585 -- Even if analyzed, the package may not be currently visible. It
2586 -- must be while the with_type clause is active.
2588 Set_Is_Immediately_Visible (P);
2591 First (Visible_Declarations (Specification (Unit (Cunit (Unum)))));
2592 while Present (Decl) loop
2593 if Nkind (Decl) = N_Full_Type_Declaration
2594 and then Chars (Defining_Identifier (Decl)) = Chars (Sel)
2596 Typ := Defining_Identifier (Decl);
2598 if Tagged_Present (N) then
2600 -- The declaration must indicate that this is a tagged
2601 -- type or a type extension.
2603 if (Nkind (Type_Definition (Decl)) = N_Record_Definition
2604 and then Tagged_Present (Type_Definition (Decl)))
2606 (Nkind (Type_Definition (Decl))
2607 = N_Derived_Type_Definition
2609 (Record_Extension_Part (Type_Definition (Decl))))
2613 Error_Msg_N ("imported type is not a tagged type", Nam);
2617 if not Analyzed (Decl) then
2619 -- Unit is not currently visible. Add basic attributes
2620 -- to type and build its class-wide type.
2622 Init_Size_Align (Typ);
2623 Decorate_Tagged_Type (Typ);
2627 if Nkind (Type_Definition (Decl))
2628 /= N_Access_To_Object_Definition
2631 ("imported type is not an access type", Nam);
2633 elsif not Analyzed (Decl) then
2634 Set_Ekind (Typ, E_Access_Type);
2635 Set_Etype (Typ, Typ);
2637 Init_Size (Typ, System_Address_Size);
2638 Init_Alignment (Typ);
2639 Set_Directly_Designated_Type (Typ, Standard_Integer);
2640 Set_From_With_Type (Typ);
2642 if not In_Chain (Typ) then
2643 Set_Homonym (Typ, Current_Entity (Typ));
2644 Set_Current_Entity (Typ);
2649 Set_Entity (Sel, Typ);
2652 elsif ((Nkind (Decl) = N_Private_Type_Declaration
2653 and then Tagged_Present (Decl))
2654 or else (Nkind (Decl) = N_Private_Extension_Declaration))
2655 and then Chars (Defining_Identifier (Decl)) = Chars (Sel)
2657 Typ := Defining_Identifier (Decl);
2659 if not Tagged_Present (N) then
2660 Error_Msg_N ("type must be declared tagged", N);
2662 elsif not Analyzed (Decl) then
2663 Decorate_Tagged_Type (Typ);
2666 Set_Entity (Sel, Typ);
2667 Set_From_With_Type (Typ);
2671 Decl := Next (Decl);
2674 Error_Msg_NE ("not a visible access or tagged type in&", Nam, P);
2676 end Analyze_With_Type_Clause;
2678 -----------------------------
2679 -- Check_With_Type_Clauses --
2680 -----------------------------
2682 procedure Check_With_Type_Clauses (N : Node_Id) is
2683 Lib_Unit : constant Node_Id := Unit (N);
2685 procedure Check_Parent_Context (U : Node_Id);
2686 -- Examine context items of parent unit to locate with_type clauses
2688 --------------------------
2689 -- Check_Parent_Context --
2690 --------------------------
2692 procedure Check_Parent_Context (U : Node_Id) is
2696 Item := First (Context_Items (U));
2697 while Present (Item) loop
2698 if Nkind (Item) = N_With_Type_Clause
2699 and then not Error_Posted (Item)
2701 From_With_Type (Scope (Entity (Selector_Name (Name (Item)))))
2703 Error_Msg_Sloc := Sloc (Item);
2704 Error_Msg_N ("missing With_Clause for With_Type_Clause#", N);
2709 end Check_Parent_Context;
2711 -- Start of processing for Check_With_Type_Clauses
2714 if Extensions_Allowed
2715 and then (Nkind (Lib_Unit) = N_Package_Body
2716 or else Nkind (Lib_Unit) = N_Subprogram_Body)
2718 Check_Parent_Context (Library_Unit (N));
2720 if Is_Child_Spec (Unit (Library_Unit (N))) then
2721 Check_Parent_Context (Parent_Spec (Unit (Library_Unit (N))));
2724 end Check_With_Type_Clauses;
2726 ------------------------------
2727 -- Check_Private_Child_Unit --
2728 ------------------------------
2730 procedure Check_Private_Child_Unit (N : Node_Id) is
2731 Lib_Unit : constant Node_Id := Unit (N);
2733 Curr_Unit : Entity_Id;
2734 Sub_Parent : Node_Id;
2735 Priv_Child : Entity_Id;
2736 Par_Lib : Entity_Id;
2739 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2740 -- Returns true if and only if the library unit is declared with
2741 -- an explicit designation of private.
2743 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2744 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2747 return Private_Present (Comp_Unit);
2748 end Is_Private_Library_Unit;
2750 -- Start of processing for Check_Private_Child_Unit
2753 if Nkind (Lib_Unit) = N_Package_Body
2754 or else Nkind (Lib_Unit) = N_Subprogram_Body
2756 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2757 Par_Lib := Curr_Unit;
2759 elsif Nkind (Lib_Unit) = N_Subunit then
2761 -- The parent is itself a body. The parent entity is to be found
2762 -- in the corresponding spec.
2764 Sub_Parent := Library_Unit (N);
2765 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2767 -- If the parent itself is a subunit, Curr_Unit is the entity
2768 -- of the enclosing body, retrieve the spec entity which is
2769 -- the proper ancestor we need for the following tests.
2771 if Ekind (Curr_Unit) = E_Package_Body then
2772 Curr_Unit := Spec_Entity (Curr_Unit);
2775 Par_Lib := Curr_Unit;
2778 Curr_Unit := Defining_Entity (Lib_Unit);
2780 Par_Lib := Curr_Unit;
2781 Par_Spec := Parent_Spec (Lib_Unit);
2783 if No (Par_Spec) then
2786 Par_Lib := Defining_Entity (Unit (Par_Spec));
2790 -- Loop through context items
2792 Item := First (Context_Items (N));
2793 while Present (Item) loop
2795 -- Ada 2005 (AI-262): Allow private_with of a private child package
2796 -- in public siblings
2798 if Nkind (Item) = N_With_Clause
2799 and then not Implicit_With (Item)
2800 and then Is_Private_Descendant (Entity (Name (Item)))
2802 Priv_Child := Entity (Name (Item));
2805 Curr_Parent : Entity_Id := Par_Lib;
2806 Child_Parent : Entity_Id := Scope (Priv_Child);
2807 Prv_Ancestor : Entity_Id := Child_Parent;
2808 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2811 -- If the child unit is a public child then locate
2812 -- the nearest private ancestor; Child_Parent will
2813 -- then be set to the parent of that ancestor.
2815 if not Is_Private_Library_Unit (Priv_Child) then
2816 while Present (Prv_Ancestor)
2817 and then not Is_Private_Library_Unit (Prv_Ancestor)
2819 Prv_Ancestor := Scope (Prv_Ancestor);
2822 if Present (Prv_Ancestor) then
2823 Child_Parent := Scope (Prv_Ancestor);
2827 while Present (Curr_Parent)
2828 and then Curr_Parent /= Standard_Standard
2829 and then Curr_Parent /= Child_Parent
2832 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2833 Curr_Parent := Scope (Curr_Parent);
2836 if No (Curr_Parent) then
2837 Curr_Parent := Standard_Standard;
2840 if Curr_Parent /= Child_Parent then
2841 if Ekind (Priv_Child) = E_Generic_Package
2842 and then Chars (Priv_Child) in Text_IO_Package_Name
2843 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2846 ("& is a nested package, not a compilation unit",
2847 Name (Item), Priv_Child);
2851 ("unit in with clause is private child unit!", Item);
2853 ("\current unit must also have parent&!",
2854 Item, Child_Parent);
2857 elsif not Curr_Private
2858 and then not Private_Present (Item)
2859 and then Nkind (Lib_Unit) /= N_Package_Body
2860 and then Nkind (Lib_Unit) /= N_Subprogram_Body
2861 and then Nkind (Lib_Unit) /= N_Subunit
2864 ("current unit must also be private descendant of&",
2865 Item, Child_Parent);
2873 end Check_Private_Child_Unit;
2875 ----------------------
2876 -- Check_Stub_Level --
2877 ----------------------
2879 procedure Check_Stub_Level (N : Node_Id) is
2880 Par : constant Node_Id := Parent (N);
2881 Kind : constant Node_Kind := Nkind (Par);
2884 if (Kind = N_Package_Body
2885 or else Kind = N_Subprogram_Body
2886 or else Kind = N_Task_Body
2887 or else Kind = N_Protected_Body)
2888 and then (Nkind (Parent (Par)) = N_Compilation_Unit
2889 or else Nkind (Parent (Par)) = N_Subunit)
2893 -- In an instance, a missing stub appears at any level. A warning
2894 -- message will have been emitted already for the missing file.
2896 elsif not In_Instance then
2897 Error_Msg_N ("stub cannot appear in an inner scope", N);
2899 elsif Expander_Active then
2900 Error_Msg_N ("missing proper body", N);
2902 end Check_Stub_Level;
2904 ------------------------
2905 -- Expand_With_Clause --
2906 ------------------------
2908 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2909 Loc : constant Source_Ptr := Sloc (Nam);
2910 Ent : constant Entity_Id := Entity (Nam);
2914 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2915 -- Comment requireed here ???
2917 ---------------------
2918 -- Build_Unit_Name --
2919 ---------------------
2921 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2925 if Nkind (Nam) = N_Identifier then
2926 return New_Occurrence_Of (Entity (Nam), Loc);
2930 Make_Expanded_Name (Loc,
2931 Chars => Chars (Entity (Nam)),
2932 Prefix => Build_Unit_Name (Prefix (Nam)),
2933 Selector_Name => New_Occurrence_Of (Entity (Nam), Loc));
2934 Set_Entity (Result, Entity (Nam));
2937 end Build_Unit_Name;
2939 -- Start of processing for Expand_With_Clause
2942 New_Nodes_OK := New_Nodes_OK + 1;
2944 Make_With_Clause (Loc, Name => Build_Unit_Name (Nam));
2946 P := Parent (Unit_Declaration_Node (Ent));
2947 Set_Library_Unit (Withn, P);
2948 Set_Corresponding_Spec (Withn, Ent);
2949 Set_First_Name (Withn, True);
2950 Set_Implicit_With (Withn, True);
2952 -- If the unit is a package declaration, a private_with_clause on a
2953 -- child unit implies that the implicit with on the parent is also
2956 if Nkind (Unit (N)) = N_Package_Declaration then
2957 Set_Private_Present (Withn, Private_Present (Item));
2960 Prepend (Withn, Context_Items (N));
2961 Mark_Rewrite_Insertion (Withn);
2962 Install_Withed_Unit (Withn);
2964 if Nkind (Nam) = N_Expanded_Name then
2965 Expand_With_Clause (Item, Prefix (Nam), N);
2968 New_Nodes_OK := New_Nodes_OK - 1;
2969 end Expand_With_Clause;
2971 -----------------------
2972 -- Get_Parent_Entity --
2973 -----------------------
2975 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2977 if Nkind (Unit) = N_Package_Body
2978 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2982 (Specification (Instance_Spec (Original_Node (Unit))));
2984 elsif Nkind (Unit) = N_Package_Instantiation then
2985 return Defining_Entity (Specification (Instance_Spec (Unit)));
2988 return Defining_Entity (Unit);
2990 end Get_Parent_Entity;
2992 -----------------------------
2993 -- Implicit_With_On_Parent --
2994 -----------------------------
2996 procedure Implicit_With_On_Parent
2997 (Child_Unit : Node_Id;
3000 Loc : constant Source_Ptr := Sloc (N);
3001 P : constant Node_Id := Parent_Spec (Child_Unit);
3003 P_Unit : Node_Id := Unit (P);
3005 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
3008 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
3009 -- Build prefix of child unit name. Recurse if needed
3011 function Build_Unit_Name return Node_Id;
3012 -- If the unit is a child unit, build qualified name with all
3015 -------------------------
3016 -- Build_Ancestor_Name --
3017 -------------------------
3019 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
3020 P_Ref : constant Node_Id :=
3021 New_Reference_To (Defining_Entity (P), Loc);
3022 P_Spec : Node_Id := P;
3025 -- Ancestor may have been rewritten as a package body. Retrieve
3026 -- the original spec to trace earlier ancestors.
3028 if Nkind (P) = N_Package_Body
3029 and then Nkind (Original_Node (P)) = N_Package_Instantiation
3031 P_Spec := Original_Node (P);
3034 if No (Parent_Spec (P_Spec)) then
3038 Make_Selected_Component (Loc,
3039 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
3040 Selector_Name => P_Ref);
3042 end Build_Ancestor_Name;
3044 ---------------------
3045 -- Build_Unit_Name --
3046 ---------------------
3048 function Build_Unit_Name return Node_Id is
3051 if No (Parent_Spec (P_Unit)) then
3052 return New_Reference_To (P_Name, Loc);
3055 Make_Expanded_Name (Loc,
3056 Chars => Chars (P_Name),
3057 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
3058 Selector_Name => New_Reference_To (P_Name, Loc));
3059 Set_Entity (Result, P_Name);
3062 end Build_Unit_Name;
3064 -- Start of processing for Implicit_With_On_Parent
3067 -- The unit of the current compilation may be a package body
3068 -- that replaces an instance node. In this case we need the
3069 -- original instance node to construct the proper parent name.
3071 if Nkind (P_Unit) = N_Package_Body
3072 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
3074 P_Unit := Original_Node (P_Unit);
3077 -- We add the implicit with if the child unit is the current unit
3078 -- being compiled. If the current unit is a body, we do not want
3079 -- to add an implicit_with a second time to the corresponding spec.
3081 if Nkind (Child_Unit) = N_Package_Declaration
3082 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
3087 New_Nodes_OK := New_Nodes_OK + 1;
3088 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
3090 Set_Library_Unit (Withn, P);
3091 Set_Corresponding_Spec (Withn, P_Name);
3092 Set_First_Name (Withn, True);
3093 Set_Implicit_With (Withn, True);
3095 -- Node is placed at the beginning of the context items, so that
3096 -- subsequent use clauses on the parent can be validated.
3098 Prepend (Withn, Context_Items (N));
3099 Mark_Rewrite_Insertion (Withn);
3100 Install_Withed_Unit (Withn);
3102 if Is_Child_Spec (P_Unit) then
3103 Implicit_With_On_Parent (P_Unit, N);
3106 New_Nodes_OK := New_Nodes_OK - 1;
3107 end Implicit_With_On_Parent;
3113 function In_Chain (E : Entity_Id) return Boolean is
3117 H := Current_Entity (E);
3118 while Present (H) loop
3129 ---------------------
3130 -- Install_Context --
3131 ---------------------
3133 procedure Install_Context (N : Node_Id) is
3134 Lib_Unit : constant Node_Id := Unit (N);
3137 Install_Context_Clauses (N);
3139 if Is_Child_Spec (Lib_Unit) then
3140 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
3143 Install_Limited_Context_Clauses (N);
3145 Check_With_Type_Clauses (N);
3146 end Install_Context;
3148 -----------------------------
3149 -- Install_Context_Clauses --
3150 -----------------------------
3152 procedure Install_Context_Clauses (N : Node_Id) is
3153 Lib_Unit : constant Node_Id := Unit (N);
3155 Uname_Node : Entity_Id;
3156 Check_Private : Boolean := False;
3157 Decl_Node : Node_Id;
3158 Lib_Parent : Entity_Id;
3161 -- First skip configuration pragmas at the start of the context. They
3162 -- are not technically part of the context clause, but that's where the
3163 -- parser puts them. Note they were analyzed in Analyze_Context.
3165 Item := First (Context_Items (N));
3166 while Present (Item)
3167 and then Nkind (Item) = N_Pragma
3168 and then Chars (Item) in Configuration_Pragma_Names
3173 -- Loop through the actual context clause items. We process everything
3174 -- except Limited_With clauses in this routine. Limited_With clauses
3175 -- are separately installed (see Install_Limited_Context_Clauses).
3177 while Present (Item) loop
3179 -- Case of explicit WITH clause
3181 if Nkind (Item) = N_With_Clause
3182 and then not Implicit_With (Item)
3184 if Limited_Present (Item) then
3186 -- Limited withed units will be installed later
3190 -- If Name (Item) is not an entity name, something is wrong, and
3191 -- this will be detected in due course, for now ignore the item
3193 elsif not Is_Entity_Name (Name (Item)) then
3196 elsif No (Entity (Name (Item))) then
3197 Set_Entity (Name (Item), Any_Id);
3201 Uname_Node := Entity (Name (Item));
3203 if Is_Private_Descendant (Uname_Node) then
3204 Check_Private := True;
3207 Install_Withed_Unit (Item);
3209 Decl_Node := Unit_Declaration_Node (Uname_Node);
3211 -- If the unit is a subprogram instance, it appears nested
3212 -- within a package that carries the parent information.
3214 if Is_Generic_Instance (Uname_Node)
3215 and then Ekind (Uname_Node) /= E_Package
3217 Decl_Node := Parent (Parent (Decl_Node));
3220 if Is_Child_Spec (Decl_Node) then
3221 if Nkind (Name (Item)) = N_Expanded_Name then
3222 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3224 -- if not an expanded name, the child unit must be a
3225 -- renaming, nothing to do.
3230 elsif Nkind (Decl_Node) = N_Subprogram_Body
3231 and then not Acts_As_Spec (Parent (Decl_Node))
3232 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3234 Implicit_With_On_Parent
3235 (Unit (Library_Unit (Parent (Decl_Node))), N);
3238 -- Check license conditions unless this is a dummy unit
3240 if Sloc (Library_Unit (Item)) /= No_Location then
3241 License_Check : declare
3243 Withu : constant Unit_Number_Type :=
3244 Get_Source_Unit (Library_Unit (Item));
3246 Withl : constant License_Type :=
3247 License (Source_Index (Withu));
3249 Unitl : constant License_Type :=
3250 License (Source_Index (Current_Sem_Unit));
3252 procedure License_Error;
3253 -- Signal error of bad license
3259 procedure License_Error is
3262 ("?license of with'ed unit & may be inconsistent",
3266 -- Start of processing for License_Check
3269 -- Exclude license check if withed unit is an internal unit.
3270 -- This situation arises e.g. with the GPL version of GNAT.
3272 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3275 -- Otherwise check various cases
3287 if Withl = Restricted then
3291 when Modified_GPL =>
3292 if Withl = Restricted or else Withl = GPL then
3296 when Unrestricted =>
3303 -- Case of USE PACKAGE clause
3305 elsif Nkind (Item) = N_Use_Package_Clause then
3306 Analyze_Use_Package (Item);
3308 -- Case of USE TYPE clause
3310 elsif Nkind (Item) = N_Use_Type_Clause then
3311 Analyze_Use_Type (Item);
3313 -- Case of WITH TYPE clause
3315 -- A With_Type_Clause is processed when installing the context,
3316 -- because it is a visibility mechanism and does not create a
3317 -- semantic dependence on other units, as a With_Clause does.
3319 elsif Nkind (Item) = N_With_Type_Clause then
3320 Analyze_With_Type_Clause (Item);
3324 elsif Nkind (Item) = N_Pragma then
3332 if Is_Child_Spec (Lib_Unit) then
3334 -- The unit also has implicit withs on its own parents
3336 if No (Context_Items (N)) then
3337 Set_Context_Items (N, New_List);
3340 Implicit_With_On_Parent (Lib_Unit, N);
3343 -- If the unit is a body, the context of the specification must also
3346 if Nkind (Lib_Unit) = N_Package_Body
3347 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3348 and then not Acts_As_Spec (N))
3350 Install_Context (Library_Unit (N));
3352 if Is_Child_Spec (Unit (Library_Unit (N))) then
3354 -- If the unit is the body of a public child unit, the private
3355 -- declarations of the parent must be made visible. If the child
3356 -- unit is private, the private declarations have been installed
3357 -- already in the call to Install_Parents for the spec. Installing
3358 -- private declarations must be done for all ancestors of public
3359 -- child units. In addition, sibling units mentioned in the
3360 -- context clause of the body are directly visible.
3368 Lib_Spec := Unit (Library_Unit (N));
3369 while Is_Child_Spec (Lib_Spec) loop
3370 P := Unit (Parent_Spec (Lib_Spec));
3371 P_Name := Defining_Entity (P);
3373 if not (Private_Present (Parent (Lib_Spec)))
3374 and then not In_Private_Part (P_Name)
3376 Install_Private_Declarations (P_Name);
3377 Install_Private_With_Clauses (P_Name);
3378 Set_Use (Private_Declarations (Specification (P)));
3386 -- For a package body, children in context are immediately visible
3388 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3391 if Nkind (Lib_Unit) = N_Generic_Package_Declaration
3392 or else Nkind (Lib_Unit) = N_Generic_Subprogram_Declaration
3393 or else Nkind (Lib_Unit) = N_Package_Declaration
3394 or else Nkind (Lib_Unit) = N_Subprogram_Declaration
3396 if Is_Child_Spec (Lib_Unit) then
3397 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3398 Set_Is_Private_Descendant
3399 (Defining_Entity (Lib_Unit),
3400 Is_Private_Descendant (Lib_Parent)
3401 or else Private_Present (Parent (Lib_Unit)));
3404 Set_Is_Private_Descendant
3405 (Defining_Entity (Lib_Unit),
3406 Private_Present (Parent (Lib_Unit)));
3410 if Check_Private then
3411 Check_Private_Child_Unit (N);
3413 end Install_Context_Clauses;
3415 -------------------------------------
3416 -- Install_Limited_Context_Clauses --
3417 -------------------------------------
3419 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3422 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3423 -- Check that the unlimited view of a given compilation_unit is not
3424 -- already visible through "use + renamings".
3426 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3427 -- Check that if a limited_with clause of a given compilation_unit
3428 -- mentions a descendant of a private child of some library unit,
3429 -- then the given compilation_unit shall be the declaration of a
3430 -- private descendant of that library unit.
3432 procedure Expand_Limited_With_Clause
3433 (Comp_Unit : Node_Id; Nam : Node_Id; N : Node_Id);
3434 -- If a child unit appears in a limited_with clause, there are implicit
3435 -- limited_with clauses on all parents that are not already visible
3436 -- through a regular with clause. This procedure creates the implicit
3437 -- limited with_clauses for the parents and loads the corresponding
3438 -- units. The shadow entities are created when the inserted clause is
3439 -- analyzed. Implements Ada 2005 (AI-50217).
3441 ---------------------
3442 -- Check_Renamings --
3443 ---------------------
3445 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3454 pragma Assert (Nkind (W) = N_With_Clause);
3456 -- Protect the frontend against previous critical errors
3458 case Nkind (Unit (Library_Unit (W))) is
3459 when N_Subprogram_Declaration |
3460 N_Package_Declaration |
3461 N_Generic_Subprogram_Declaration |
3462 N_Generic_Package_Declaration =>
3469 -- Check "use + renamings"
3471 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3472 Spec := Specification (Unit (P));
3474 Item := First (Visible_Declarations (Spec));
3475 while Present (Item) loop
3477 -- Look only at use package clauses
3479 if Nkind (Item) = N_Use_Package_Clause then
3481 -- Traverse the list of packages
3483 Nam := First (Names (Item));
3484 while Present (Nam) loop
3487 pragma Assert (Present (Parent (E)));
3489 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3490 and then Renamed_Entity (E) = WEnt
3492 -- The unlimited view is visible through use clause and
3493 -- renamings. There is not need to generate the error
3494 -- message here because Is_Visible_Through_Renamings
3495 -- takes care of generating the precise error message.
3499 elsif Nkind (Parent (E)) = N_Package_Specification then
3501 -- The use clause may refer to a local package.
3502 -- Check all the enclosing scopes.
3505 while E2 /= Standard_Standard
3506 and then E2 /= WEnt loop
3512 ("unlimited view visible through use clause ", W);
3524 -- Recursive call to check all the ancestors
3526 if Is_Child_Spec (Unit (P)) then
3527 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3529 end Check_Renamings;
3531 ---------------------------------------
3532 -- Check_Private_Limited_Withed_Unit --
3533 ---------------------------------------
3535 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3536 Curr_Parent : Node_Id;
3537 Child_Parent : Node_Id;
3540 -- Compilation unit of the parent of the withed library unit
3542 Child_Parent := Parent_Spec (Unit (Library_Unit (Item)));
3544 -- If the child unit is a public child, then locate its nearest
3545 -- private ancestor, if any; Child_Parent will then be set to
3546 -- the parent of that ancestor.
3548 if not Private_Present (Library_Unit (Item)) then
3549 while Present (Child_Parent)
3550 and then not Private_Present (Child_Parent)
3552 Child_Parent := Parent_Spec (Unit (Child_Parent));
3555 if No (Child_Parent) then
3559 Child_Parent := Parent_Spec (Unit (Child_Parent));
3562 -- Traverse all the ancestors of the current compilation
3563 -- unit to check if it is a descendant of named library unit.
3565 Curr_Parent := Parent (Item);
3567 while Present (Parent_Spec (Unit (Curr_Parent)))
3568 and then Curr_Parent /= Child_Parent
3570 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3573 if Curr_Parent /= Child_Parent then
3575 ("unit in with clause is private child unit!", Item);
3577 ("\current unit must also have parent&!",
3578 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3580 elsif not Private_Present (Parent (Item))
3581 and then not Private_Present (Item)
3582 and then Nkind (Unit (Parent (Item))) /= N_Package_Body
3583 and then Nkind (Unit (Parent (Item))) /= N_Subprogram_Body
3584 and then Nkind (Unit (Parent (Item))) /= N_Subunit
3587 ("current unit must also be private descendant of&",
3588 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3590 end Check_Private_Limited_Withed_Unit;
3592 --------------------------------
3593 -- Expand_Limited_With_Clause --
3594 --------------------------------
3596 procedure Expand_Limited_With_Clause
3597 (Comp_Unit : Node_Id;
3601 Loc : constant Source_Ptr := Sloc (Nam);
3602 Unum : Unit_Number_Type;
3605 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3606 -- Returns true if the context already includes a with_clause for
3607 -- this unit. If the with_clause is non-limited, the unit is fully
3608 -- visible and an implicit limited_with should not be created. If
3609 -- there is already a limited_with clause for W, a second one is
3610 -- simply redundant.
3612 --------------------------
3613 -- Previous_Withed_Unit --
3614 --------------------------
3616 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3620 -- A limited with_clause cannot appear in the same context_clause
3621 -- as a nonlimited with_clause which mentions the same library.
3623 Item := First (Context_Items (Comp_Unit));
3624 while Present (Item) loop
3625 if Nkind (Item) = N_With_Clause
3626 and then Library_Unit (Item) = Library_Unit (W)
3635 end Previous_Withed_Unit;
3637 -- Start of processing for Expand_Limited_With_Clause
3640 New_Nodes_OK := New_Nodes_OK + 1;
3642 if Nkind (Nam) = N_Identifier then
3644 -- Create node for name of withed unit
3647 Make_With_Clause (Loc,
3648 Name => New_Copy (Nam));
3650 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3652 Make_With_Clause (Loc,
3653 Name => Make_Selected_Component (Loc,
3654 Prefix => New_Copy_Tree (Prefix (Nam)),
3655 Selector_Name => Selector_Name (Nam)));
3656 Set_Parent (Withn, Parent (N));
3659 Set_Limited_Present (Withn);
3660 Set_First_Name (Withn);
3661 Set_Implicit_With (Withn);
3665 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3670 -- Do not generate a limited_with_clause on the current unit.
3671 -- This path is taken when a unit has a limited_with clause on
3672 -- one of its child units.
3674 if Unum = Current_Sem_Unit then
3678 Set_Library_Unit (Withn, Cunit (Unum));
3679 Set_Corresponding_Spec
3680 (Withn, Specification (Unit (Cunit (Unum))));
3682 if not Previous_Withed_Unit (Withn) then
3683 Prepend (Withn, Context_Items (Parent (N)));
3684 Mark_Rewrite_Insertion (Withn);
3686 -- Add implicit limited_with_clauses for parents of child units
3687 -- mentioned in limited_with clauses.
3689 if Nkind (Nam) = N_Selected_Component then
3690 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3695 if not Limited_View_Installed (Withn) then
3696 Install_Limited_Withed_Unit (Withn);
3700 New_Nodes_OK := New_Nodes_OK - 1;
3701 end Expand_Limited_With_Clause;
3703 -- Start of processing for Install_Limited_Context_Clauses
3706 Item := First (Context_Items (N));
3707 while Present (Item) loop
3708 if Nkind (Item) = N_With_Clause
3709 and then Limited_Present (Item)
3711 if Nkind (Name (Item)) = N_Selected_Component then
3712 Expand_Limited_With_Clause
3713 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3716 Check_Private_Limited_Withed_Unit (Item);
3718 if not Implicit_With (Item)
3719 and then Is_Child_Spec (Unit (N))
3721 Check_Renamings (Parent_Spec (Unit (N)), Item);
3724 -- A unit may have a limited with on itself if it has a
3725 -- limited with_clause on one of its child units. In that
3726 -- case it is already being compiled and it makes no sense
3727 -- to install its limited view.
3729 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3730 and then not Limited_View_Installed (Item)
3732 Install_Limited_Withed_Unit (Item);
3735 -- All items other than Limited_With clauses are ignored (they were
3736 -- installed separately early on by Install_Context_Clause).
3745 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3746 -- spec, looking for incomplete subtype declarations of incomplete
3747 -- types visible through a limited with clause.
3749 if Ada_Version >= Ada_05
3750 and then Analyzed (N)
3751 and then Nkind (Unit (N)) = N_Package_Declaration
3756 Non_Lim_View : Entity_Id;
3759 Decl := First (Visible_Declarations (Specification (Unit (N))));
3760 while Present (Decl) loop
3761 if Nkind (Decl) = N_Subtype_Declaration
3763 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3765 From_With_Type (Defining_Identifier (Decl))
3767 Def_Id := Defining_Identifier (Decl);
3768 Non_Lim_View := Non_Limited_View (Def_Id);
3770 -- Convert an incomplete subtype declaration into a
3771 -- corresponding non-limited view subtype declaration.
3773 Set_Subtype_Indication (Decl,
3774 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3775 Set_Etype (Def_Id, Non_Lim_View);
3776 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3777 Set_Analyzed (Decl, False);
3779 -- Reanalyze the declaration, suppressing the call to
3780 -- Enter_Name to avoid duplicate names.
3782 Analyze_Subtype_Declaration
3791 end Install_Limited_Context_Clauses;
3793 ---------------------
3794 -- Install_Parents --
3795 ---------------------
3797 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3804 P := Unit (Parent_Spec (Lib_Unit));
3805 P_Name := Get_Parent_Entity (P);
3807 if Etype (P_Name) = Any_Type then
3811 if Ekind (P_Name) = E_Generic_Package
3812 and then Nkind (Lib_Unit) /= N_Generic_Subprogram_Declaration
3813 and then Nkind (Lib_Unit) /= N_Generic_Package_Declaration
3814 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3817 ("child of a generic package must be a generic unit", Lib_Unit);
3819 elsif not Is_Package_Or_Generic_Package (P_Name) then
3821 ("parent unit must be package or generic package", Lib_Unit);
3822 raise Unrecoverable_Error;
3824 elsif Present (Renamed_Object (P_Name)) then
3825 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3826 raise Unrecoverable_Error;
3828 -- Verify that a child of an instance is itself an instance, or
3829 -- the renaming of one. Given that an instance that is a unit is
3830 -- replaced with a package declaration, check against the original
3831 -- node. The parent may be currently being instantiated, in which
3832 -- case it appears as a declaration, but the generic_parent is
3833 -- already established indicating that we deal with an instance.
3835 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3837 if Nkind (Lib_Unit) in N_Renaming_Declaration
3838 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3840 (Nkind (Lib_Unit) = N_Package_Declaration
3841 and then Present (Generic_Parent (Specification (Lib_Unit))))
3846 ("child of an instance must be an instance or renaming",
3851 -- This is the recursive call that ensures all parents are loaded
3853 if Is_Child_Spec (P) then
3855 Is_Private or else Private_Present (Parent (Lib_Unit)));
3858 -- Now we can install the context for this parent
3860 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3861 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3862 Install_Siblings (P_Name, Parent (Lib_Unit));
3864 -- The child unit is in the declarative region of the parent. The
3865 -- parent must therefore appear in the scope stack and be visible,
3866 -- as when compiling the corresponding body. If the child unit is
3867 -- private or it is a package body, private declarations must be
3868 -- accessible as well. Use declarations in the parent must also
3869 -- be installed. Finally, other child units of the same parent that
3870 -- are in the context are immediately visible.
3872 -- Find entity for compilation unit, and set its private descendant
3873 -- status as needed.
3875 E_Name := Defining_Entity (Lib_Unit);
3877 Set_Is_Child_Unit (E_Name);
3879 Set_Is_Private_Descendant (E_Name,
3880 Is_Private_Descendant (P_Name)
3881 or else Private_Present (Parent (Lib_Unit)));
3883 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3886 -- Save current visibility of unit
3888 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3889 Is_Immediately_Visible (P_Name);
3890 Set_Is_Immediately_Visible (P_Name);
3891 Install_Visible_Declarations (P_Name);
3892 Set_Use (Visible_Declarations (P_Spec));
3894 -- If the parent is a generic unit, its formal part may contain
3895 -- formal packages and use clauses for them.
3897 if Ekind (P_Name) = E_Generic_Package then
3898 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3902 or else Private_Present (Parent (Lib_Unit))
3904 Install_Private_Declarations (P_Name);
3905 Install_Private_With_Clauses (P_Name);
3906 Set_Use (Private_Declarations (P_Spec));
3908 end Install_Parents;
3910 ----------------------------------
3911 -- Install_Private_With_Clauses --
3912 ----------------------------------
3914 procedure Install_Private_With_Clauses (P : Entity_Id) is
3915 Decl : constant Node_Id := Unit_Declaration_Node (P);
3919 if Debug_Flag_I then
3920 Write_Str ("install private with clauses of ");
3921 Write_Name (Chars (P));
3925 if Nkind (Parent (Decl)) = N_Compilation_Unit then
3926 Item := First (Context_Items (Parent (Decl)));
3927 while Present (Item) loop
3928 if Nkind (Item) = N_With_Clause
3929 and then Private_Present (Item)
3931 if Limited_Present (Item) then
3932 if not Limited_View_Installed (Item) then
3933 Install_Limited_Withed_Unit (Item);
3936 Install_Withed_Unit (Item, Private_With_OK => True);
3943 end Install_Private_With_Clauses;
3945 ----------------------
3946 -- Install_Siblings --
3947 ----------------------
3949 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
3954 -- Iterate over explicit with clauses, and check whether the
3955 -- scope of each entity is an ancestor of the current unit, in
3956 -- which case it is immediately visible.
3958 Item := First (Context_Items (N));
3959 while Present (Item) loop
3961 -- Do not install private_with_clauses if the unit is a package
3962 -- declaration, unless it is itself a private child unit.
3964 if Nkind (Item) = N_With_Clause
3965 and then not Implicit_With (Item)
3966 and then not Limited_Present (Item)
3968 (not Private_Present (Item)
3969 or else Nkind (Unit (N)) /= N_Package_Declaration
3970 or else Private_Present (N))
3972 Id := Entity (Name (Item));
3974 if Is_Child_Unit (Id)
3975 and then Is_Ancestor_Package (Scope (Id), U_Name)
3977 Set_Is_Immediately_Visible (Id);
3979 -- Check for the presence of another unit in the context,
3980 -- that may be inadvertently hidden by the child.
3982 Prev := Current_Entity (Id);
3985 and then Is_Immediately_Visible (Prev)
3986 and then not Is_Child_Unit (Prev)
3992 Clause := First (Context_Items (N));
3993 while Present (Clause) loop
3994 if Nkind (Clause) = N_With_Clause
3995 and then Entity (Name (Clause)) = Prev
3998 ("child unit& hides compilation unit " &
3999 "with the same name?",
4009 -- The With_Clause may be on a grand-child or one of its
4010 -- further descendants, which makes a child immediately visible.
4011 -- Examine ancestry to determine whether such a child exists.
4012 -- For example, if current unit is A.C, and with_clause is on
4013 -- A.X.Y.Z, then X is immediately visible.
4015 elsif Is_Child_Unit (Id) then
4021 while Is_Child_Unit (Par) loop
4022 if Is_Ancestor_Package (Scope (Par), U_Name) then
4023 Set_Is_Immediately_Visible (Par);
4035 end Install_Siblings;
4037 -------------------------------
4038 -- Install_Limited_With_Unit --
4039 -------------------------------
4041 procedure Install_Limited_Withed_Unit (N : Node_Id) is
4042 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
4045 Is_Child_Package : Boolean := False;
4047 Lim_Header : Entity_Id;
4048 Lim_Typ : Entity_Id;
4050 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
4051 -- Check if some package installed though normal with-clauses has a
4052 -- renaming declaration of package P. AARM 10.1.2(21/2).
4054 ----------------------------------
4055 -- Is_Visible_Through_Renamings --
4056 ----------------------------------
4058 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4059 Kind : constant Node_Kind :=
4060 Nkind (Unit (Cunit (Current_Sem_Unit)));
4066 -- Example of the error detected by this subprogram:
4074 -- package Ren_P renames P;
4080 -- limited with P; -- ERROR
4081 -- package R.C is ...
4083 Aux_Unit := Cunit (Current_Sem_Unit);
4086 Item := First (Context_Items (Aux_Unit));
4087 while Present (Item) loop
4088 if Nkind (Item) = N_With_Clause
4089 and then not Limited_Present (Item)
4090 and then Nkind (Unit (Library_Unit (Item)))
4091 = N_Package_Declaration
4094 First (Visible_Declarations
4095 (Specification (Unit (Library_Unit (Item)))));
4096 while Present (Decl) loop
4097 if Nkind (Decl) = N_Package_Renaming_Declaration
4098 and then Entity (Name (Decl)) = P
4100 -- Generate the error message only if the current unit
4101 -- is a package declaration; in case of subprogram
4102 -- bodies and package bodies we just return true to
4103 -- indicate that the limited view must not be
4106 if Kind = N_Package_Declaration then
4108 ("simultaneous visibility of the limited and" &
4109 " unlimited views not allowed", N);
4110 Error_Msg_Sloc := Sloc (Item);
4112 ("\unlimited view of & visible through the" &
4113 " context clause found #", N, P);
4114 Error_Msg_Sloc := Sloc (Decl);
4115 Error_Msg_NE ("\and the renaming found #", N, P);
4128 if Present (Library_Unit (Aux_Unit)) then
4129 if Aux_Unit = Library_Unit (Aux_Unit) then
4131 -- Aux_Unit is a body that acts as a spec. Clause has
4132 -- already been flagged as illegal.
4137 Aux_Unit := Library_Unit (Aux_Unit);
4140 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4143 exit when No (Aux_Unit);
4147 end Is_Visible_Through_Renamings;
4149 -- Start of processing for Install_Limited_Withed_Unit
4152 pragma Assert (not Limited_View_Installed (N));
4154 -- In case of limited with_clause on subprograms, generics, instances,
4155 -- or renamings, the corresponding error was previously posted and we
4156 -- have nothing to do here.
4158 if Nkind (P_Unit) /= N_Package_Declaration then
4162 P := Defining_Unit_Name (Specification (P_Unit));
4164 -- Handle child packages
4166 if Nkind (P) = N_Defining_Program_Unit_Name then
4167 Is_Child_Package := True;
4168 P := Defining_Identifier (P);
4171 -- Do not install the limited-view if the full-view is already visible
4172 -- through renaming declarations.
4174 if Is_Visible_Through_Renamings (P) then
4178 -- A common use of the limited-with is to have a limited-with
4179 -- in the package spec, and a normal with in its package body.
4182 -- limited with X; -- [1]
4186 -- package body A is ...
4188 -- The compilation of A's body installs the context clauses found at [2]
4189 -- and then the context clauses of its specification (found at [1]). As
4190 -- a consequence, at [1] the specification of X has been analyzed and it
4191 -- is immediately visible. According to the semantics of limited-with
4192 -- context clauses we don't install the limited view because the full
4193 -- view of X supersedes its limited view.
4195 if Analyzed (P_Unit)
4196 and then (Is_Immediately_Visible (P)
4197 or else (Is_Child_Package
4198 and then Is_Visible_Child_Unit (P)))
4200 -- Ada 2005 (AI-262): Install the private declarations of P
4202 if Private_Present (N)
4203 and then not In_Private_Part (P)
4209 Id := First_Private_Entity (P);
4210 while Present (Id) loop
4211 if not Is_Internal (Id)
4212 and then not Is_Child_Unit (Id)
4214 if not In_Chain (Id) then
4215 Set_Homonym (Id, Current_Entity (Id));
4216 Set_Current_Entity (Id);
4219 Set_Is_Immediately_Visible (Id);
4225 Set_In_Private_Part (P);
4232 if Debug_Flag_I then
4233 Write_Str ("install limited view of ");
4234 Write_Name (Chars (P));
4238 -- If the unit has not been analyzed and the limited view has not been
4239 -- already installed then we install it.
4241 if not Analyzed (P_Unit) then
4242 if not In_Chain (P) then
4244 -- Minimum decoration
4246 Set_Ekind (P, E_Package);
4247 Set_Etype (P, Standard_Void_Type);
4248 Set_Scope (P, Standard_Standard);
4250 if Is_Child_Package then
4251 Set_Is_Child_Unit (P);
4252 Set_Is_Visible_Child_Unit (P);
4253 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4256 -- Place entity on visibility structure
4258 Set_Homonym (P, Current_Entity (P));
4259 Set_Current_Entity (P);
4261 if Debug_Flag_I then
4262 Write_Str (" (homonym) chain ");
4263 Write_Name (Chars (P));
4267 -- Install the incomplete view. The first element of the limited
4268 -- view is a header (an E_Package entity) used to reference the
4269 -- first shadow entity in the private part of the package.
4271 Lim_Header := Limited_View (P);
4272 Lim_Typ := First_Entity (Lim_Header);
4274 while Present (Lim_Typ)
4275 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4277 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4278 Set_Current_Entity (Lim_Typ);
4280 if Debug_Flag_I then
4281 Write_Str (" (homonym) chain ");
4282 Write_Name (Chars (Lim_Typ));
4286 Next_Entity (Lim_Typ);
4290 -- If the unit appears in a previous regular with_clause, the regular
4291 -- entities of the public part of the withed package must be replaced
4292 -- by the shadow ones.
4294 -- This code must be kept synchronized with the code that replaces the
4295 -- the shadow entities by the real entities (see body of Remove_Limited
4296 -- With_Clause); otherwise the contents of the homonym chains are not
4300 -- Hide all the type entities of the public part of the package to
4301 -- avoid its usage. This is needed to cover all the subtype decla-
4302 -- rations because we do not remove them from the homonym chain.
4304 E := First_Entity (P);
4305 while Present (E) and then E /= First_Private_Entity (P) loop
4307 Set_Was_Hidden (E, Is_Hidden (E));
4314 -- Replace the real entities by the shadow entities of the limited
4315 -- view. The first element of the limited view is a header that is
4316 -- used to reference the first shadow entity in the private part
4319 Lim_Header := Limited_View (P);
4321 Lim_Typ := First_Entity (Lim_Header);
4322 while Present (Lim_Typ)
4323 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4325 pragma Assert (not In_Chain (Lim_Typ));
4327 -- Do not unchain nested packages and child units
4329 if Ekind (Lim_Typ) /= E_Package
4330 and then not Is_Child_Unit (Lim_Typ)
4336 Prev := Current_Entity (Lim_Typ);
4338 -- Handle incomplete types
4340 if Ekind (Prev) = E_Incomplete_Type then
4341 E := Full_View (Prev);
4346 -- Replace E in the homonyms list
4348 if E = Non_Limited_View (Lim_Typ) then
4349 Set_Homonym (Lim_Typ, Homonym (Prev));
4350 Set_Current_Entity (Lim_Typ);
4354 E := Homonym (Prev);
4355 pragma Assert (Present (E));
4357 -- Handle incomplete types
4359 if Ekind (E) = E_Incomplete_Type then
4363 exit when E = Non_Limited_View (Lim_Typ);
4365 Prev := Homonym (Prev);
4368 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4369 Set_Homonym (Prev, Lim_Typ);
4373 if Debug_Flag_I then
4374 Write_Str (" (homonym) chain ");
4375 Write_Name (Chars (Lim_Typ));
4380 Next_Entity (Lim_Typ);
4384 -- The package must be visible while the limited-with clause is active
4385 -- because references to the type P.T must resolve in the usual way.
4386 -- In addition, we remember that the limited-view has been installed to
4387 -- uninstall it at the point of context removal.
4389 Set_Is_Immediately_Visible (P);
4390 Set_Limited_View_Installed (N);
4392 -- If the package in the limited_with clause is a child unit, the
4393 -- clause is unanalyzed and appears as a selected component. Recast
4394 -- it as an expanded name so that the entity can be properly set. Use
4395 -- entity of parent, if available, for higher ancestors in the name.
4397 if Nkind (Name (N)) = N_Selected_Component then
4405 while Nkind (Nam) = N_Selected_Component
4406 and then Present (Ent)
4408 Change_Selected_Component_To_Expanded_Name (Nam);
4410 -- Set entity of parent identifiers if the unit is a child
4411 -- unit. This ensures that the tree is properly formed from
4412 -- semantic point of view (e.g. for ASIS queries).
4414 Set_Entity (Nam, Ent);
4416 Nam := Prefix (Nam);
4419 -- Set entity of last ancestor
4421 if Nkind (Nam) = N_Identifier then
4422 Set_Entity (Nam, Ent);
4428 Set_Entity (Name (N), P);
4429 Set_From_With_Type (P);
4430 end Install_Limited_Withed_Unit;
4432 -------------------------
4433 -- Install_Withed_Unit --
4434 -------------------------
4436 procedure Install_Withed_Unit
4437 (With_Clause : Node_Id;
4438 Private_With_OK : Boolean := False)
4440 Uname : constant Entity_Id := Entity (Name (With_Clause));
4441 P : constant Entity_Id := Scope (Uname);
4444 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4445 -- compiling a package declaration and the Private_With_OK flag was not
4446 -- set by the caller. These declarations will be installed later (before
4447 -- analyzing the private part of the package).
4449 if Private_Present (With_Clause)
4450 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
4451 and then not (Private_With_OK)
4456 if Debug_Flag_I then
4457 if Private_Present (With_Clause) then
4458 Write_Str ("install private withed unit ");
4460 Write_Str ("install withed unit ");
4463 Write_Name (Chars (Uname));
4467 -- We do not apply the restrictions to an internal unit unless
4468 -- we are compiling the internal unit as a main unit. This check
4469 -- is also skipped for dummy units (for missing packages).
4471 if Sloc (Uname) /= No_Location
4472 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
4473 or else Current_Sem_Unit = Main_Unit)
4475 Check_Restricted_Unit
4476 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
4479 if P /= Standard_Standard then
4481 -- If the unit is not analyzed after analysis of the with clause and
4482 -- it is an instantiation then it awaits a body and is the main unit.
4483 -- Its appearance in the context of some other unit indicates a
4484 -- circular dependency (DEC suite perversity).
4486 if not Analyzed (Uname)
4487 and then Nkind (Parent (Uname)) = N_Package_Instantiation
4490 ("instantiation depends on itself", Name (With_Clause));
4492 elsif not Is_Visible_Child_Unit (Uname) then
4493 Set_Is_Visible_Child_Unit (Uname);
4495 -- If the child unit appears in the context of its parent, it is
4496 -- immediately visible.
4498 if In_Open_Scopes (Scope (Uname)) then
4499 Set_Is_Immediately_Visible (Uname);
4502 if Is_Generic_Instance (Uname)
4503 and then Ekind (Uname) in Subprogram_Kind
4505 -- Set flag as well on the visible entity that denotes the
4506 -- instance, which renames the current one.
4508 Set_Is_Visible_Child_Unit
4510 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
4513 -- The parent unit may have been installed already, and may have
4514 -- appeared in a use clause.
4516 if In_Use (Scope (Uname)) then
4517 Set_Is_Potentially_Use_Visible (Uname);
4520 Set_Context_Installed (With_Clause);
4523 elsif not Is_Immediately_Visible (Uname) then
4524 if not Private_Present (With_Clause)
4525 or else Private_With_OK
4527 Set_Is_Immediately_Visible (Uname);
4530 Set_Context_Installed (With_Clause);
4533 -- A with-clause overrides a with-type clause: there are no restric-
4534 -- tions on the use of package entities.
4536 if Ekind (Uname) = E_Package then
4537 Set_From_With_Type (Uname, False);
4540 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4541 -- unit if there is a visible homograph for it declared in the same
4542 -- declarative region. This pathological case can only arise when an
4543 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4544 -- G1 has a generic child also named G2, and the context includes with_
4545 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4546 -- of I1.G2 visible as well. If the child unit is named Standard, do
4547 -- not apply the check to the Standard package itself.
4549 if Is_Child_Unit (Uname)
4550 and then Is_Visible_Child_Unit (Uname)
4551 and then Ada_Version >= Ada_05
4554 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
4560 U2 := Homonym (Uname);
4562 and U2 /= Standard_Standard
4565 Decl2 := Unit_Declaration_Node (P2);
4567 if Is_Child_Unit (U2)
4568 and then Is_Visible_Child_Unit (U2)
4570 if Is_Generic_Instance (P)
4571 and then Nkind (Decl1) = N_Package_Declaration
4572 and then Generic_Parent (Specification (Decl1)) = P2
4574 Error_Msg_N ("illegal with_clause", With_Clause);
4576 ("\child unit has visible homograph" &
4577 " ('R'M 8.3(26), 10.1.1(19))",
4581 elsif Is_Generic_Instance (P2)
4582 and then Nkind (Decl2) = N_Package_Declaration
4583 and then Generic_Parent (Specification (Decl2)) = P
4585 -- With_clause for child unit of instance appears before
4586 -- in the context. We want to place the error message on
4587 -- it, not on the generic child unit itself.
4590 Prev_Clause : Node_Id;
4593 Prev_Clause := First (List_Containing (With_Clause));
4594 while Entity (Name (Prev_Clause)) /= U2 loop
4598 pragma Assert (Present (Prev_Clause));
4599 Error_Msg_N ("illegal with_clause", Prev_Clause);
4601 ("\child unit has visible homograph" &
4602 " ('R'M 8.3(26), 10.1.1(19))",
4613 end Install_Withed_Unit;
4619 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
4620 K : constant Node_Kind := Nkind (Lib_Unit);
4623 return (K in N_Generic_Declaration or else
4624 K in N_Generic_Instantiation or else
4625 K in N_Generic_Renaming_Declaration or else
4626 K = N_Package_Declaration or else
4627 K = N_Package_Renaming_Declaration or else
4628 K = N_Subprogram_Declaration or else
4629 K = N_Subprogram_Renaming_Declaration)
4630 and then Present (Parent_Spec (Lib_Unit));
4633 -----------------------
4634 -- Load_Needed_Body --
4635 -----------------------
4637 -- N is a generic unit named in a with clause, or else it is
4638 -- a unit that contains a generic unit or an inlined function.
4639 -- In order to perform an instantiation, the body of the unit
4640 -- must be present. If the unit itself is generic, we assume
4641 -- that an instantiation follows, and load and analyze the body
4642 -- unconditionally. This forces analysis of the spec as well.
4644 -- If the unit is not generic, but contains a generic unit, it
4645 -- is loaded on demand, at the point of instantiation (see ch12).
4647 procedure Load_Needed_Body (N : Node_Id; OK : out Boolean) is
4648 Body_Name : Unit_Name_Type;
4649 Unum : Unit_Number_Type;
4651 Save_Style_Check : constant Boolean := Opt.Style_Check;
4652 -- The loading and analysis is done with style checks off
4655 if not GNAT_Mode then
4656 Style_Check := False;
4659 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
4662 (Load_Name => Body_Name,
4668 if Unum = No_Unit then
4672 Compiler_State := Analyzing; -- reset after load
4674 if not Fatal_Error (Unum) or else Try_Semantics then
4675 if Debug_Flag_L then
4676 Write_Str ("*** Loaded generic body");
4680 Semantics (Cunit (Unum));
4686 Style_Check := Save_Style_Check;
4687 end Load_Needed_Body;
4689 -------------------------
4690 -- Build_Limited_Views --
4691 -------------------------
4693 procedure Build_Limited_Views (N : Node_Id) is
4694 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
4695 P : constant Entity_Id := Cunit_Entity (Unum);
4697 Spec : Node_Id; -- To denote a package specification
4698 Lim_Typ : Entity_Id; -- To denote shadow entities
4699 Comp_Typ : Entity_Id; -- To denote real entities
4701 Lim_Header : Entity_Id; -- Package entity
4702 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
4703 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
4705 procedure Decorate_Incomplete_Type
4708 -- Add attributes of an incomplete type to a shadow entity. The same
4709 -- attributes are placed on the real entity, so that gigi receives
4710 -- a consistent view.
4712 procedure Decorate_Package_Specification (P : Entity_Id);
4713 -- Add attributes of a package entity to the entity in a package
4716 procedure Decorate_Tagged_Type
4720 -- Set basic attributes of tagged type T, including its class_wide type.
4721 -- The parameters Loc, Scope are used to decorate the class_wide type.
4723 procedure Build_Chain
4725 First_Decl : Node_Id);
4726 -- Construct list of shadow entities and attach it to entity of
4727 -- package that is mentioned in a limited_with clause.
4729 function New_Internal_Shadow_Entity
4730 (Kind : Entity_Kind;
4731 Sloc_Value : Source_Ptr;
4732 Id_Char : Character) return Entity_Id;
4733 -- Build a new internal entity and append it to the list of shadow
4734 -- entities available through the limited-header
4736 ------------------------------
4737 -- Decorate_Incomplete_Type --
4738 ------------------------------
4740 procedure Decorate_Incomplete_Type
4745 Set_Ekind (E, E_Incomplete_Type);
4746 Set_Scope (E, Scop);
4748 Set_Is_First_Subtype (E, True);
4749 Set_Stored_Constraint (E, No_Elist);
4750 Set_Full_View (E, Empty);
4751 Init_Size_Align (E);
4752 end Decorate_Incomplete_Type;
4754 --------------------------
4755 -- Decorate_Tagged_Type --
4756 --------------------------
4758 procedure Decorate_Tagged_Type
4766 Decorate_Incomplete_Type (T, Scop);
4767 Set_Is_Tagged_Type (T);
4769 -- Build corresponding class_wide type, if not previously done
4771 if No (Class_Wide_Type (T)) then
4772 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S'));
4774 Set_Ekind (CW, E_Class_Wide_Type);
4776 Set_Scope (CW, Scop);
4777 Set_Is_Tagged_Type (CW);
4778 Set_Is_First_Subtype (CW, True);
4779 Init_Size_Align (CW);
4780 Set_Has_Unknown_Discriminants (CW, True);
4781 Set_Class_Wide_Type (CW, CW);
4782 Set_Equivalent_Type (CW, Empty);
4783 Set_From_With_Type (CW, From_With_Type (T));
4785 Set_Class_Wide_Type (T, CW);
4787 end Decorate_Tagged_Type;
4789 ------------------------------------
4790 -- Decorate_Package_Specification --
4791 ------------------------------------
4793 procedure Decorate_Package_Specification (P : Entity_Id) is
4795 -- Place only the most basic attributes
4797 Set_Ekind (P, E_Package);
4798 Set_Etype (P, Standard_Void_Type);
4799 end Decorate_Package_Specification;
4801 --------------------------------
4802 -- New_Internal_Shadow_Entity --
4803 --------------------------------
4805 function New_Internal_Shadow_Entity
4806 (Kind : Entity_Kind;
4807 Sloc_Value : Source_Ptr;
4808 Id_Char : Character) return Entity_Id
4810 E : constant Entity_Id :=
4811 Make_Defining_Identifier (Sloc_Value,
4812 Chars => New_Internal_Name (Id_Char));
4815 Set_Ekind (E, Kind);
4816 Set_Is_Internal (E, True);
4818 if Kind in Type_Kind then
4819 Init_Size_Align (E);
4822 Append_Entity (E, Lim_Header);
4825 end New_Internal_Shadow_Entity;
4831 procedure Build_Chain
4833 First_Decl : Node_Id)
4835 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
4836 Is_Tagged : Boolean;
4841 while Present (Decl) loop
4843 -- For each library_package_declaration in the environment, there
4844 -- is an implicit declaration of a *limited view* of that library
4845 -- package. The limited view of a package contains:
4847 -- * For each nested package_declaration, a declaration of the
4848 -- limited view of that package, with the same defining-
4849 -- program-unit name.
4851 -- * For each type_declaration in the visible part, an incomplete
4852 -- type-declaration with the same defining_identifier, whose
4853 -- completion is the type_declaration. If the type_declaration
4854 -- is tagged, then the incomplete_type_declaration is tagged
4856 -- The partial view is tagged if the declaration has the
4857 -- explicit keyword, or else if it is a type extension, both
4858 -- of which can be ascertained syntactically.
4860 if Nkind (Decl) = N_Full_Type_Declaration then
4862 (Nkind (Type_Definition (Decl)) = N_Record_Definition
4863 and then Tagged_Present (Type_Definition (Decl)))
4865 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
4868 (Record_Extension_Part (Type_Definition (Decl))));
4870 Comp_Typ := Defining_Identifier (Decl);
4872 if not Analyzed_Unit then
4874 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4876 Decorate_Incomplete_Type (Comp_Typ, Scope);
4880 -- Create shadow entity for type
4882 Lim_Typ := New_Internal_Shadow_Entity
4883 (Kind => Ekind (Comp_Typ),
4884 Sloc_Value => Sloc (Comp_Typ),
4887 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4888 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4889 Set_From_With_Type (Lim_Typ);
4892 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4894 Decorate_Incomplete_Type (Lim_Typ, Scope);
4897 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4899 elsif Nkind (Decl) = N_Private_Type_Declaration then
4900 Comp_Typ := Defining_Identifier (Decl);
4902 if not Analyzed_Unit then
4903 if Tagged_Present (Decl) then
4904 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4906 Decorate_Incomplete_Type (Comp_Typ, Scope);
4910 Lim_Typ := New_Internal_Shadow_Entity
4911 (Kind => Ekind (Comp_Typ),
4912 Sloc_Value => Sloc (Comp_Typ),
4915 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4916 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4917 Set_From_With_Type (Lim_Typ);
4919 if Tagged_Present (Decl) then
4920 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4922 Decorate_Incomplete_Type (Lim_Typ, Scope);
4925 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4927 elsif Nkind (Decl) = N_Private_Extension_Declaration then
4928 Comp_Typ := Defining_Identifier (Decl);
4930 if not Analyzed_Unit then
4931 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
4934 -- Create shadow entity for type
4936 Lim_Typ := New_Internal_Shadow_Entity
4937 (Kind => Ekind (Comp_Typ),
4938 Sloc_Value => Sloc (Comp_Typ),
4941 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4942 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4943 Set_From_With_Type (Lim_Typ);
4945 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
4946 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
4948 elsif Nkind (Decl) = N_Package_Declaration then
4953 Spec : constant Node_Id := Specification (Decl);
4956 Comp_Typ := Defining_Unit_Name (Spec);
4958 if not Analyzed (Cunit (Unum)) then
4959 Decorate_Package_Specification (Comp_Typ);
4960 Set_Scope (Comp_Typ, Scope);
4963 Lim_Typ := New_Internal_Shadow_Entity
4964 (Kind => Ekind (Comp_Typ),
4965 Sloc_Value => Sloc (Comp_Typ),
4968 Decorate_Package_Specification (Lim_Typ);
4969 Set_Scope (Lim_Typ, Scope);
4971 Set_Chars (Lim_Typ, Chars (Comp_Typ));
4972 Set_Parent (Lim_Typ, Parent (Comp_Typ));
4973 Set_From_With_Type (Lim_Typ);
4975 -- Note: The non_limited_view attribute is not used
4976 -- for local packages.
4980 First_Decl => First (Visible_Declarations (Spec)));
4988 -- Start of processing for Build_Limited_Views
4991 pragma Assert (Limited_Present (N));
4993 -- A library_item mentioned in a limited_with_clause shall be
4994 -- a package_declaration, not a subprogram_declaration,
4995 -- generic_declaration, generic_instantiation, or
4996 -- package_renaming_declaration
4998 case Nkind (Unit (Library_Unit (N))) is
5000 when N_Package_Declaration =>
5003 when N_Subprogram_Declaration =>
5004 Error_Msg_N ("subprograms not allowed in "
5005 & "limited with_clauses", N);
5008 when N_Generic_Package_Declaration |
5009 N_Generic_Subprogram_Declaration =>
5010 Error_Msg_N ("generics not allowed in "
5011 & "limited with_clauses", N);
5014 when N_Generic_Instantiation =>
5015 Error_Msg_N ("generic instantiations not allowed in "
5016 & "limited with_clauses", N);
5019 when N_Generic_Renaming_Declaration =>
5020 Error_Msg_N ("generic renamings not allowed in "
5021 & "limited with_clauses", N);
5024 when N_Subprogram_Renaming_Declaration =>
5025 Error_Msg_N ("renamed subprograms not allowed in "
5026 & "limited with_clauses", N);
5029 when N_Package_Renaming_Declaration =>
5030 Error_Msg_N ("renamed packages not allowed in "
5031 & "limited with_clauses", N);
5035 raise Program_Error;
5038 -- Check if the chain is already built
5040 Spec := Specification (Unit (Library_Unit (N)));
5042 if Limited_View_Installed (Spec) then
5046 Set_Ekind (P, E_Package);
5048 -- Build the header of the limited_view
5050 Lim_Header := Make_Defining_Identifier (Sloc (N),
5051 Chars => New_Internal_Name (Id_Char => 'Z'));
5052 Set_Ekind (Lim_Header, E_Package);
5053 Set_Is_Internal (Lim_Header);
5054 Set_Limited_View (P, Lim_Header);
5056 -- Create the auxiliary chain. All the shadow entities are appended
5057 -- to the list of entities of the limited-view header
5061 First_Decl => First (Visible_Declarations (Spec)));
5063 -- Save the last built shadow entity. It is needed later to set the
5064 -- reference to the first shadow entity in the private part
5066 Last_Pub_Lim_E := Last_Lim_E;
5068 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5069 -- Required to give support to limited-private-with clauses
5071 Build_Chain (Scope => P,
5072 First_Decl => First (Private_Declarations (Spec)));
5074 if Last_Pub_Lim_E /= Empty then
5075 Set_First_Private_Entity (Lim_Header,
5076 Next_Entity (Last_Pub_Lim_E));
5078 Set_First_Private_Entity (Lim_Header,
5082 Set_Limited_View_Installed (Spec);
5083 end Build_Limited_Views;
5085 -------------------------------
5086 -- Check_Body_Needed_For_SAL --
5087 -------------------------------
5089 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5091 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5092 -- Determine whether use of entity E might require the presence
5093 -- of its body. For a package this requires a recursive traversal
5094 -- of all nested declarations.
5096 ---------------------------
5097 -- Entity_Needed_For_SAL --
5098 ---------------------------
5100 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5104 if Is_Subprogram (E)
5105 and then Has_Pragma_Inline (E)
5109 elsif Ekind (E) = E_Generic_Function
5110 or else Ekind (E) = E_Generic_Procedure
5114 elsif Ekind (E) = E_Generic_Package
5116 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5117 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5121 elsif Ekind (E) = E_Package
5123 Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5124 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5126 Ent := First_Entity (E);
5127 while Present (Ent) loop
5128 if Entity_Needs_Body (Ent) then
5140 end Entity_Needs_Body;
5142 -- Start of processing for Check_Body_Needed_For_SAL
5145 if Ekind (Unit_Name) = E_Generic_Package
5147 Nkind (Unit_Declaration_Node (Unit_Name)) =
5148 N_Generic_Package_Declaration
5150 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5152 Set_Body_Needed_For_SAL (Unit_Name);
5154 elsif Ekind (Unit_Name) = E_Generic_Procedure
5155 or else Ekind (Unit_Name) = E_Generic_Function
5157 Set_Body_Needed_For_SAL (Unit_Name);
5159 elsif Is_Subprogram (Unit_Name)
5160 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5161 N_Subprogram_Declaration
5162 and then Has_Pragma_Inline (Unit_Name)
5164 Set_Body_Needed_For_SAL (Unit_Name);
5166 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5167 Check_Body_Needed_For_SAL
5168 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5170 elsif Ekind (Unit_Name) = E_Package
5171 and then Entity_Needs_Body (Unit_Name)
5173 Set_Body_Needed_For_SAL (Unit_Name);
5175 elsif Ekind (Unit_Name) = E_Package_Body
5176 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5178 Check_Body_Needed_For_SAL
5179 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5181 end Check_Body_Needed_For_SAL;
5183 --------------------
5184 -- Remove_Context --
5185 --------------------
5187 procedure Remove_Context (N : Node_Id) is
5188 Lib_Unit : constant Node_Id := Unit (N);
5191 -- If this is a child unit, first remove the parent units
5193 if Is_Child_Spec (Lib_Unit) then
5194 Remove_Parents (Lib_Unit);
5197 Remove_Context_Clauses (N);
5200 ----------------------------
5201 -- Remove_Context_Clauses --
5202 ----------------------------
5204 procedure Remove_Context_Clauses (N : Node_Id) is
5206 Unit_Name : Entity_Id;
5209 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5210 -- limited-views first and regular-views later (to maintain the
5213 -- First Phase: Remove limited_with context clauses
5215 Item := First (Context_Items (N));
5216 while Present (Item) loop
5218 -- We are interested only in with clauses which got installed
5221 if Nkind (Item) = N_With_Clause
5222 and then Limited_Present (Item)
5223 and then Limited_View_Installed (Item)
5225 Remove_Limited_With_Clause (Item);
5231 -- Second Phase: Loop through context items and undo regular
5232 -- with_clauses and use_clauses.
5234 Item := First (Context_Items (N));
5235 while Present (Item) loop
5237 -- We are interested only in with clauses which got installed
5238 -- on entry, as indicated by their Context_Installed flag set
5240 if Nkind (Item) = N_With_Clause
5241 and then Limited_Present (Item)
5242 and then Limited_View_Installed (Item)
5246 elsif Nkind (Item) = N_With_Clause
5247 and then Context_Installed (Item)
5249 -- Remove items from one with'ed unit
5251 Unit_Name := Entity (Name (Item));
5252 Remove_Unit_From_Visibility (Unit_Name);
5253 Set_Context_Installed (Item, False);
5255 elsif Nkind (Item) = N_Use_Package_Clause then
5256 End_Use_Package (Item);
5258 elsif Nkind (Item) = N_Use_Type_Clause then
5259 End_Use_Type (Item);
5261 elsif Nkind (Item) = N_With_Type_Clause then
5262 Remove_With_Type_Clause (Name (Item));
5267 end Remove_Context_Clauses;
5269 --------------------------------
5270 -- Remove_Limited_With_Clause --
5271 --------------------------------
5273 procedure Remove_Limited_With_Clause (N : Node_Id) is
5274 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5277 Lim_Header : Entity_Id;
5278 Lim_Typ : Entity_Id;
5282 pragma Assert (Limited_View_Installed (N));
5284 -- In case of limited with_clause on subprograms, generics, instances,
5285 -- or renamings, the corresponding error was previously posted and we
5286 -- have nothing to do here.
5288 if Nkind (P_Unit) /= N_Package_Declaration then
5292 P := Defining_Unit_Name (Specification (P_Unit));
5294 -- Handle child packages
5296 if Nkind (P) = N_Defining_Program_Unit_Name then
5297 P := Defining_Identifier (P);
5300 if Debug_Flag_I then
5301 Write_Str ("remove limited view of ");
5302 Write_Name (Chars (P));
5303 Write_Str (" from visibility");
5307 -- Prepare the removal of the shadow entities from visibility. The
5308 -- first element of the limited view is a header (an E_Package
5309 -- entity) that is used to reference the first shadow entity in the
5310 -- private part of the package
5312 Lim_Header := Limited_View (P);
5313 Lim_Typ := First_Entity (Lim_Header);
5315 -- Remove package and shadow entities from visibility if it has not
5318 if not Analyzed (P_Unit) then
5320 Set_Is_Immediately_Visible (P, False);
5322 while Present (Lim_Typ) loop
5324 Next_Entity (Lim_Typ);
5327 -- Otherwise this package has already appeared in the closure and its
5328 -- shadow entities must be replaced by its real entities. This code
5329 -- must be kept synchronized with the complementary code in Install
5330 -- Limited_Withed_Unit.
5333 -- Real entities that are type or subtype declarations were hidden
5334 -- from visibility at the point of installation of the limited-view.
5335 -- Now we recover the previous value of the hidden attribute.
5337 E := First_Entity (P);
5338 while Present (E) and then E /= First_Private_Entity (P) loop
5340 Set_Is_Hidden (E, Was_Hidden (E));
5346 while Present (Lim_Typ)
5347 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5349 -- Nested packages and child units were not unchained
5351 if Ekind (Lim_Typ) /= E_Package
5352 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5354 -- Handle incomplete types of the real view. For this purpose
5355 -- we traverse the list of visible entities to look for an
5356 -- incomplete type in the real-view associated with Lim_Typ.
5358 E := First_Entity (P);
5359 while Present (E) and then E /= First_Private_Entity (P) loop
5360 exit when Ekind (E) = E_Incomplete_Type
5361 and then Present (Full_View (E))
5362 and then Full_View (E) = Lim_Typ;
5367 -- If the previous search was not sucessful then the entity
5368 -- to be restored in the homonym list is the non-limited view
5370 if E = First_Private_Entity (P) then
5371 E := Non_Limited_View (Lim_Typ);
5374 pragma Assert (not In_Chain (E));
5376 Prev := Current_Entity (Lim_Typ);
5378 if Prev = Lim_Typ then
5379 Set_Current_Entity (E);
5382 while Present (Prev)
5383 and then Homonym (Prev) /= Lim_Typ
5385 Prev := Homonym (Prev);
5387 pragma Assert (Present (Prev));
5389 Set_Homonym (Prev, E);
5392 -- We must also set the next homonym entity of the real entity
5393 -- to handle the case in which the next homonym was a shadow
5396 Set_Homonym (E, Homonym (Lim_Typ));
5399 Next_Entity (Lim_Typ);
5403 -- Indicate that the limited view of the package is not installed
5405 Set_From_With_Type (P, False);
5406 Set_Limited_View_Installed (N, False);
5407 end Remove_Limited_With_Clause;
5409 --------------------
5410 -- Remove_Parents --
5411 --------------------
5413 procedure Remove_Parents (Lib_Unit : Node_Id) is
5416 P_Spec : Node_Id := Empty;
5418 Vis : constant Boolean :=
5419 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
5422 if Is_Child_Spec (Lib_Unit) then
5423 P_Spec := Parent_Spec (Lib_Unit);
5425 elsif Nkind (Lib_Unit) = N_Package_Body
5426 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
5428 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
5431 if Present (P_Spec) then
5434 P_Name := Get_Parent_Entity (P);
5435 Remove_Context_Clauses (P_Spec);
5436 End_Package_Scope (P_Name);
5437 Set_Is_Immediately_Visible (P_Name, Vis);
5439 -- Remove from visibility the siblings as well, which are directly
5440 -- visible while the parent is in scope.
5442 E := First_Entity (P_Name);
5443 while Present (E) loop
5444 if Is_Child_Unit (E) then
5445 Set_Is_Immediately_Visible (E, False);
5451 Set_In_Package_Body (P_Name, False);
5453 -- This is the recursive call to remove the context of any
5454 -- higher level parent. This recursion ensures that all parents
5455 -- are removed in the reverse order of their installation.
5461 ---------------------------------
5462 -- Remove_Private_With_Clauses --
5463 ---------------------------------
5465 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
5469 Item := First (Context_Items (Comp_Unit));
5470 while Present (Item) loop
5471 if Nkind (Item) = N_With_Clause
5472 and then Private_Present (Item)
5474 if Limited_Present (Item) then
5475 if not Limited_View_Installed (Item) then
5476 Remove_Limited_With_Clause (Item);
5479 Remove_Unit_From_Visibility (Entity (Name (Item)));
5480 Set_Context_Installed (Item, False);
5486 end Remove_Private_With_Clauses;
5488 -----------------------------
5489 -- Remove_With_Type_Clause --
5490 -----------------------------
5492 procedure Remove_With_Type_Clause (Name : Node_Id) is
5496 procedure Unchain (E : Entity_Id);
5497 -- Remove entity from visibility list
5503 procedure Unchain (E : Entity_Id) is
5507 Prev := Current_Entity (E);
5509 -- Package entity may appear is several with_type_clauses, and
5510 -- may have been removed already.
5516 Set_Name_Entity_Id (Chars (E), Homonym (E));
5519 while Present (Prev)
5520 and then Homonym (Prev) /= E
5522 Prev := Homonym (Prev);
5525 if Present (Prev) then
5526 Set_Homonym (Prev, Homonym (E));
5531 -- Start of processing for Remove_With_Type_Clause
5534 if Nkind (Name) = N_Selected_Component then
5535 Typ := Entity (Selector_Name (Name));
5537 -- If no Typ, then error in declaration, ignore
5548 -- If the exporting package has been analyzed, it has appeared in the
5549 -- context already and should be left alone. Otherwise, remove from
5552 if not Analyzed (Unit_Declaration_Node (P)) then
5555 Set_Is_Frozen (Typ, False);
5558 if Ekind (Typ) = E_Record_Type then
5559 Set_From_With_Type (Class_Wide_Type (Typ), False);
5560 Set_From_With_Type (Typ, False);
5563 Set_From_With_Type (P, False);
5565 -- If P is a child unit, remove parents as well
5569 and then P /= Standard_Standard
5571 Set_From_With_Type (P, False);
5573 if not Analyzed (Unit_Declaration_Node (P)) then
5580 -- The back-end needs to know that an access type is imported, so it
5581 -- does not need elaboration and can appear in a mutually recursive
5582 -- record definition, so the imported flag on an access type is
5585 end Remove_With_Type_Clause;
5587 ---------------------------------
5588 -- Remove_Unit_From_Visibility --
5589 ---------------------------------
5591 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
5592 P : constant Entity_Id := Scope (Unit_Name);
5596 if Debug_Flag_I then
5597 Write_Str ("remove unit ");
5598 Write_Name (Chars (Unit_Name));
5599 Write_Str (" from visibility");
5603 if P /= Standard_Standard then
5604 Set_Is_Visible_Child_Unit (Unit_Name, False);
5607 Set_Is_Potentially_Use_Visible (Unit_Name, False);
5608 Set_Is_Immediately_Visible (Unit_Name, False);
5610 end Remove_Unit_From_Visibility;
5616 procedure Unchain (E : Entity_Id) is
5620 Prev := Current_Entity (E);
5626 Set_Name_Entity_Id (Chars (E), Homonym (E));
5629 while Present (Prev)
5630 and then Homonym (Prev) /= E
5632 Prev := Homonym (Prev);
5635 if Present (Prev) then
5636 Set_Homonym (Prev, Homonym (E));
5640 if Debug_Flag_I then
5641 Write_Str (" (homonym) unchain ");
5642 Write_Name (Chars (E));
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