1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Debug; use Debug;
28 with Einfo; use Einfo;
29 with Errout; use Errout;
30 with Exp_Util; use Exp_Util;
31 with Elists; use Elists;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
35 with Impunit; use Impunit;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Namet; use Namet;
41 with Nlists; use Nlists;
42 with Nmake; use Nmake;
44 with Output; use Output;
45 with Par_SCO; use Par_SCO;
46 with Restrict; use Restrict;
47 with Rident; use Rident;
48 with Rtsfind; use Rtsfind;
50 with Sem_Ch3; use Sem_Ch3;
51 with Sem_Ch6; use Sem_Ch6;
52 with Sem_Ch7; use Sem_Ch7;
53 with Sem_Ch8; use Sem_Ch8;
54 with Sem_Dist; use Sem_Dist;
55 with Sem_Prag; use Sem_Prag;
56 with Sem_Util; use Sem_Util;
57 with Sem_Warn; use Sem_Warn;
58 with Stand; use Stand;
59 with Sinfo; use Sinfo;
60 with Sinfo.CN; use Sinfo.CN;
61 with Sinput; use Sinput;
62 with Snames; use Snames;
63 with Style; use Style;
64 with Stylesw; use Stylesw;
65 with Tbuild; use Tbuild;
66 with Uname; use Uname;
68 package body Sem_Ch10 is
70 -----------------------
71 -- Local Subprograms --
72 -----------------------
74 procedure Analyze_Context (N : Node_Id);
75 -- Analyzes items in the context clause of compilation unit
77 procedure Build_Limited_Views (N : Node_Id);
78 -- Build and decorate the list of shadow entities for a package mentioned
79 -- in a limited_with clause. If the package was not previously analyzed
80 -- then it also performs a basic decoration of the real entities; this
81 -- is required to do not pass non-decorated entities to the back-end.
82 -- Implements Ada 2005 (AI-50217).
84 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id);
85 -- Check whether the source for the body of a compilation unit must
86 -- be included in a standalone library.
88 procedure Check_Private_Child_Unit (N : Node_Id);
89 -- If a with_clause mentions a private child unit, the compilation
90 -- unit must be a member of the same family, as described in 10.1.2.
92 procedure Check_Stub_Level (N : Node_Id);
93 -- Verify that a stub is declared immediately within a compilation unit,
94 -- and not in an inner frame.
96 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id);
97 -- When a child unit appears in a context clause, the implicit withs on
98 -- parents are made explicit, and with clauses are inserted in the context
99 -- clause before the one for the child. If a parent in the with_clause
100 -- is a renaming, the implicit with_clause is on the renaming whose name
101 -- is mentioned in the with_clause, and not on the package it renames.
102 -- N is the compilation unit whose list of context items receives the
103 -- implicit with_clauses.
105 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
106 -- Get defining entity of parent unit of a child unit. In most cases this
107 -- is the defining entity of the unit, but for a child instance whose
108 -- parent needs a body for inlining, the instantiation node of the parent
109 -- has not yet been rewritten as a package declaration, and the entity has
110 -- to be retrieved from the Instance_Spec of the unit.
112 function Has_With_Clause
115 Is_Limited : Boolean := False) return Boolean;
116 -- Determine whether compilation unit C_Unit contains a [limited] with
117 -- clause for package Pack. Use the flag Is_Limited to designate desired
120 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id);
121 -- If the main unit is a child unit, implicit withs are also added for
122 -- all its ancestors.
124 function In_Chain (E : Entity_Id) return Boolean;
125 -- Check that the shadow entity is not already in the homonym chain, for
126 -- example through a limited_with clause in a parent unit.
128 procedure Install_Context_Clauses (N : Node_Id);
129 -- Subsidiary to Install_Context and Install_Parents. Process only with_
130 -- and use_clauses for current unit and its library unit if any.
132 procedure Install_Limited_Context_Clauses (N : Node_Id);
133 -- Subsidiary to Install_Context. Process only limited with_clauses
134 -- for current unit. Implements Ada 2005 (AI-50217).
136 procedure Install_Limited_Withed_Unit (N : Node_Id);
137 -- Place shadow entities for a limited_with package in the visibility
138 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
140 procedure Install_Withed_Unit
141 (With_Clause : Node_Id;
142 Private_With_OK : Boolean := False);
143 -- If the unit is not a child unit, make unit immediately visible.
144 -- The caller ensures that the unit is not already currently installed.
145 -- The flag Private_With_OK is set true in Install_Private_With_Clauses,
146 -- which is called when compiling the private part of a package, or
147 -- installing the private declarations of a parent unit.
149 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean);
150 -- This procedure establishes the context for the compilation of a child
151 -- unit. If Lib_Unit is a child library spec then the context of the parent
152 -- is installed, and the parent itself made immediately visible, so that
153 -- the child unit is processed in the declarative region of the parent.
154 -- Install_Parents makes a recursive call to itself to ensure that all
155 -- parents are loaded in the nested case. If Lib_Unit is a library body,
156 -- the only effect of Install_Parents is to install the private decls of
157 -- the parents, because the visible parent declarations will have been
158 -- installed as part of the context of the corresponding spec.
160 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id);
161 -- In the compilation of a child unit, a child of any of the ancestor
162 -- units is directly visible if it is visible, because the parent is in
163 -- an enclosing scope. Iterate over context to find child units of U_Name
164 -- or of some ancestor of it.
166 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean;
167 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
168 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
169 -- a library spec that has a parent. If the call to Is_Child_Spec returns
170 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
171 -- compilation unit for the parent spec.
173 -- Lib_Unit can also be a subprogram body that acts as its own spec. If
174 -- the Parent_Spec is non-empty, this is also a child unit.
176 procedure Remove_Context_Clauses (N : Node_Id);
177 -- Subsidiary of previous one. Remove use_ and with_clauses
179 procedure Remove_Limited_With_Clause (N : Node_Id);
180 -- Remove from visibility the shadow entities introduced for a package
181 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
183 procedure Remove_Parents (Lib_Unit : Node_Id);
184 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
185 -- contexts established by the corresponding call to Install_Parents are
186 -- removed. Remove_Parents contains a recursive call to itself to ensure
187 -- that all parents are removed in the nested case.
189 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
190 -- Reset all visibility flags on unit after compiling it, either as a
191 -- main unit or as a unit in the context.
193 procedure Unchain (E : Entity_Id);
194 -- Remove single entity from visibility list
196 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
197 -- Common processing for all stubs (subprograms, tasks, packages, and
198 -- protected cases). N is the stub to be analyzed. Once the subunit
199 -- name is established, load and analyze. Nam is the non-overloadable
200 -- entity for which the proper body provides a completion. Subprogram
201 -- stubs are handled differently because they can be declarations.
204 -- A dummy procedure, for debugging use, called just before analyzing the
205 -- main unit (after dealing with any context clauses).
207 --------------------------
208 -- Limited_With_Clauses --
209 --------------------------
211 -- Limited_With clauses are the mechanism chosen for Ada05 to support
212 -- mutually recursive types declared in different units. A limited_with
213 -- clause that names package P in the context of unit U makes the types
214 -- declared in the visible part of P available within U, but with the
215 -- restriction that these types can only be used as incomplete types.
216 -- The limited_with clause does not impose a semantic dependence on P,
217 -- and it is possible for two packages to have limited_with_clauses on
218 -- each other without creating an elaboration circularity.
220 -- To support this feature, the analysis of a limited_with clause must
221 -- create an abbreviated view of the package, without performing any
222 -- semantic analysis on it. This "package abstract" contains shadow
223 -- types that are in one-one correspondence with the real types in the
224 -- package, and that have the properties of incomplete types.
226 -- The implementation creates two element lists: one to chain the shadow
227 -- entities, and one to chain the corresponding type entities in the tree
228 -- of the package. Links between corresponding entities in both chains
229 -- allow the compiler to select the proper view of a given type, depending
230 -- on the context. Note that in contrast with the handling of private
231 -- types, the limited view and the non-limited view of a type are treated
232 -- as separate entities, and no entity exchange needs to take place, which
233 -- makes the implementation must simpler than could be feared.
235 ------------------------------
236 -- Analyze_Compilation_Unit --
237 ------------------------------
239 procedure Analyze_Compilation_Unit (N : Node_Id) is
240 Unit_Node : constant Node_Id := Unit (N);
241 Lib_Unit : Node_Id := Library_Unit (N);
243 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
244 Par_Spec_Name : Unit_Name_Type;
245 Unum : Unit_Number_Type;
247 procedure Check_Redundant_Withs
248 (Context_Items : List_Id;
249 Spec_Context_Items : List_Id := No_List);
250 -- Determine whether the context list of a compilation unit contains
251 -- redundant with clauses. When checking body clauses against spec
252 -- clauses, set Context_Items to the context list of the body and
253 -- Spec_Context_Items to that of the spec. Parent packages are not
254 -- examined for documentation purposes.
256 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
257 -- Generate cross-reference information for the parents of child units.
258 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
260 ---------------------------
261 -- Check_Redundant_Withs --
262 ---------------------------
264 procedure Check_Redundant_Withs
265 (Context_Items : List_Id;
266 Spec_Context_Items : List_Id := No_List)
270 procedure Process_Body_Clauses
271 (Context_List : List_Id;
273 Used : in out Boolean;
274 Used_Type_Or_Elab : in out Boolean);
275 -- Examine the context clauses of a package body, trying to match
276 -- the name entity of Clause with any list element. If the match
277 -- occurs on a use package clause, set Used to True, for a use
278 -- type clause, pragma Elaborate or pragma Elaborate_All, set
279 -- Used_Type_Or_Elab to True.
281 procedure Process_Spec_Clauses
282 (Context_List : List_Id;
284 Used : in out Boolean;
285 Withed : in out Boolean;
286 Exit_On_Self : Boolean := False);
287 -- Examine the context clauses of a package spec, trying to match
288 -- the name entity of Clause with any list element. If the match
289 -- occurs on a use package clause, set Used to True, for a with
290 -- package clause other than Clause, set Withed to True. Limited
291 -- with clauses, implicitly generated with clauses and withs
292 -- having pragmas Elaborate or Elaborate_All applied to them are
293 -- skipped. Exit_On_Self is used to control the search loop and
294 -- force an exit whenever Clause sees itself in the search.
296 --------------------------
297 -- Process_Body_Clauses --
298 --------------------------
300 procedure Process_Body_Clauses
301 (Context_List : List_Id;
303 Used : in out Boolean;
304 Used_Type_Or_Elab : in out Boolean)
306 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
312 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean;
313 -- In an expanded name in a use clause, if the prefix is a
314 -- renamed package, the entity is set to the original package
315 -- as a result, when checking whether the package appears in a
316 -- previous with_clause, the renaming has to be taken into
317 -- account, to prevent spurious or incorrect warnings. The
318 -- common case is the use of Text_IO.
324 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean is
326 return Entity (N) = P
328 (Present (Renamed_Object (P))
329 and then Entity (N) = Renamed_Object (P));
332 -- Start of processing for Process_Body_Clauses
336 Used_Type_Or_Elab := False;
338 Cont_Item := First (Context_List);
339 while Present (Cont_Item) loop
341 -- Package use clause
343 if Nkind (Cont_Item) = N_Use_Package_Clause
346 -- Search through use clauses
348 Use_Item := First (Names (Cont_Item));
349 while Present (Use_Item) and then not Used loop
351 -- Case of a direct use of the one we are looking for
353 if Entity (Use_Item) = Nam_Ent then
356 -- Handle nested case, as in "with P; use P.Q.R"
363 -- Loop through prefixes looking for match
366 while Nkind (UE) = N_Expanded_Name loop
367 if Same_Unit (Prefix (UE), Nam_Ent) then
382 elsif Nkind (Cont_Item) = N_Use_Type_Clause
383 and then not Used_Type_Or_Elab
385 Subt_Mark := First (Subtype_Marks (Cont_Item));
386 while Present (Subt_Mark)
387 and then not Used_Type_Or_Elab
389 if Same_Unit (Prefix (Subt_Mark), Nam_Ent) then
390 Used_Type_Or_Elab := True;
396 -- Pragma Elaborate or Elaborate_All
398 elsif Nkind (Cont_Item) = N_Pragma
400 (Pragma_Name (Cont_Item) = Name_Elaborate
402 Pragma_Name (Cont_Item) = Name_Elaborate_All)
403 and then not Used_Type_Or_Elab
406 First (Pragma_Argument_Associations (Cont_Item));
407 while Present (Prag_Unit)
408 and then not Used_Type_Or_Elab
410 if Entity (Expression (Prag_Unit)) = Nam_Ent then
411 Used_Type_Or_Elab := True;
420 end Process_Body_Clauses;
422 --------------------------
423 -- Process_Spec_Clauses --
424 --------------------------
426 procedure Process_Spec_Clauses
427 (Context_List : List_Id;
429 Used : in out Boolean;
430 Withed : in out Boolean;
431 Exit_On_Self : Boolean := False)
433 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
441 Cont_Item := First (Context_List);
442 while Present (Cont_Item) loop
444 -- Stop the search since the context items after Cont_Item
445 -- have already been examined in a previous iteration of
446 -- the reverse loop in Check_Redundant_Withs.
449 and Cont_Item = Clause
454 -- Package use clause
456 if Nkind (Cont_Item) = N_Use_Package_Clause
459 Use_Item := First (Names (Cont_Item));
460 while Present (Use_Item) and then not Used loop
461 if Entity (Use_Item) = Nam_Ent then
468 -- Package with clause. Avoid processing self, implicitly
469 -- generated with clauses or limited with clauses. Note
470 -- that we examine with clauses having pragmas Elaborate
471 -- or Elaborate_All applied to them due to cases such as:
475 -- pragma Elaborate (Pack);
477 -- In this case, the second with clause is redundant since
478 -- the pragma applies only to the first "with Pack;".
480 elsif Nkind (Cont_Item) = N_With_Clause
481 and then not Implicit_With (Cont_Item)
482 and then not Limited_Present (Cont_Item)
483 and then Cont_Item /= Clause
484 and then Entity (Name (Cont_Item)) = Nam_Ent
491 end Process_Spec_Clauses;
493 -- Start of processing for Check_Redundant_Withs
496 Clause := Last (Context_Items);
497 while Present (Clause) loop
499 -- Avoid checking implicitly generated with clauses, limited
500 -- with clauses or withs that have pragma Elaborate or
501 -- Elaborate_All applied.
503 if Nkind (Clause) = N_With_Clause
504 and then not Implicit_With (Clause)
505 and then not Limited_Present (Clause)
506 and then not Elaborate_Present (Clause)
508 -- Package body-to-spec check
510 if Present (Spec_Context_Items) then
512 Used_In_Body : Boolean := False;
513 Used_In_Spec : Boolean := False;
514 Used_Type_Or_Elab : Boolean := False;
515 Withed_In_Spec : Boolean := False;
519 (Context_List => Spec_Context_Items,
521 Used => Used_In_Spec,
522 Withed => Withed_In_Spec);
525 (Context_List => Context_Items,
527 Used => Used_In_Body,
528 Used_Type_Or_Elab => Used_Type_Or_Elab);
530 -- "Type Elab" refers to the presence of either a use
531 -- type clause, pragmas Elaborate or Elaborate_All.
533 -- +---------------+---------------------------+------+
534 -- | Spec | Body | Warn |
535 -- +--------+------+--------+------+-----------+------+
536 -- | Withed | Used | Withed | Used | Type Elab | |
537 -- | X | | X | | | X |
538 -- | X | | X | X | | |
539 -- | X | | X | | X | |
540 -- | X | | X | X | X | |
541 -- | X | X | X | | | X |
542 -- | X | X | X | | X | |
543 -- | X | X | X | X | | X |
544 -- | X | X | X | X | X | |
545 -- +--------+------+--------+------+-----------+------+
548 and then not Used_Type_Or_Elab)
551 and then not Used_In_Body)
555 Error_Msg_N ("?redundant with clause in body", Clause);
558 Used_In_Body := False;
559 Used_In_Spec := False;
560 Used_Type_Or_Elab := False;
561 Withed_In_Spec := False;
564 -- Standalone package spec or body check
568 Dont_Care : Boolean := False;
569 Withed : Boolean := False;
572 -- The mechanism for examining the context clauses of a
573 -- package spec can be applied to package body clauses.
576 (Context_List => Context_Items,
580 Exit_On_Self => True);
583 Error_Msg_N ("?redundant with clause", Clause);
591 end Check_Redundant_Withs;
593 --------------------------------
594 -- Generate_Parent_References --
595 --------------------------------
597 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is
599 P_Name : Entity_Id := P_Id;
602 Pref := Name (Parent (Defining_Entity (N)));
604 if Nkind (Pref) = N_Expanded_Name then
606 -- Done already, if the unit has been compiled indirectly as
607 -- part of the closure of its context because of inlining.
612 while Nkind (Pref) = N_Selected_Component loop
613 Change_Selected_Component_To_Expanded_Name (Pref);
614 Set_Entity (Pref, P_Name);
615 Set_Etype (Pref, Etype (P_Name));
616 Generate_Reference (P_Name, Pref, 'r');
617 Pref := Prefix (Pref);
618 P_Name := Scope (P_Name);
621 -- The guard here on P_Name is to handle the error condition where
622 -- the parent unit is missing because the file was not found.
624 if Present (P_Name) then
625 Set_Entity (Pref, P_Name);
626 Set_Etype (Pref, Etype (P_Name));
627 Generate_Reference (P_Name, Pref, 'r');
628 Style.Check_Identifier (Pref, P_Name);
630 end Generate_Parent_References;
632 -- Start of processing for Analyze_Compilation_Unit
635 Process_Compilation_Unit_Pragmas (N);
637 -- If the unit is a subunit whose parent has not been analyzed (which
638 -- indicates that the main unit is a subunit, either the current one or
639 -- one of its descendents) then the subunit is compiled as part of the
640 -- analysis of the parent, which we proceed to do. Basically this gets
641 -- handled from the top down and we don't want to do anything at this
642 -- level (i.e. this subunit will be handled on the way down from the
643 -- parent), so at this level we immediately return. If the subunit
644 -- ends up not analyzed, it means that the parent did not contain a
645 -- stub for it, or that there errors were detected in some ancestor.
647 if Nkind (Unit_Node) = N_Subunit
648 and then not Analyzed (Lib_Unit)
650 Semantics (Lib_Unit);
652 if not Analyzed (Proper_Body (Unit_Node)) then
653 if Serious_Errors_Detected > 0 then
654 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N);
656 Error_Msg_N ("missing stub for subunit", N);
663 -- Analyze context (this will call Sem recursively for with'ed units)
667 -- If the unit is a package body, the spec is already loaded and must
668 -- be analyzed first, before we analyze the body.
670 if Nkind (Unit_Node) = N_Package_Body then
672 -- If no Lib_Unit, then there was a serious previous error, so
673 -- just ignore the entire analysis effort
675 if No (Lib_Unit) then
679 Semantics (Lib_Unit);
680 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
682 -- Verify that the library unit is a package declaration
684 if not Nkind_In (Unit (Lib_Unit), N_Package_Declaration,
685 N_Generic_Package_Declaration)
688 ("no legal package declaration for package body", N);
691 -- Otherwise, the entity in the declaration is visible. Update
692 -- the version to reflect dependence of this body on the spec.
695 Spec_Id := Defining_Entity (Unit (Lib_Unit));
696 Set_Is_Immediately_Visible (Spec_Id, True);
697 Version_Update (N, Lib_Unit);
699 if Nkind (Defining_Unit_Name (Unit_Node)) =
700 N_Defining_Program_Unit_Name
702 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
707 -- If the unit is a subprogram body, then we similarly need to analyze
708 -- its spec. However, things are a little simpler in this case, because
709 -- here, this analysis is done only for error checking and consistency
710 -- purposes, so there's nothing else to be done.
712 elsif Nkind (Unit_Node) = N_Subprogram_Body then
713 if Acts_As_Spec (N) then
715 -- If the subprogram body is a child unit, we must create a
716 -- declaration for it, in order to properly load the parent(s).
717 -- After this, the original unit does not acts as a spec, because
718 -- there is an explicit one. If this unit appears in a context
719 -- clause, then an implicit with on the parent will be added when
720 -- installing the context. If this is the main unit, there is no
721 -- Unit_Table entry for the declaration (it has the unit number
722 -- of the main unit) and code generation is unaffected.
724 Unum := Get_Cunit_Unit_Number (N);
725 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
727 if Par_Spec_Name /= No_Unit_Name then
730 (Load_Name => Par_Spec_Name,
735 if Unum /= No_Unit then
737 -- Build subprogram declaration and attach parent unit to it
738 -- This subprogram declaration does not come from source,
739 -- Nevertheless the backend must generate debugging info for
740 -- it, and this must be indicated explicitly. We also mark
741 -- the body entity as a child unit now, to prevent a
742 -- cascaded error if the spec entity cannot be entered
743 -- in its scope. Finally we create a Units table entry for
744 -- the subprogram declaration, to maintain a one-to-one
745 -- correspondence with compilation unit nodes. This is
746 -- critical for the tree traversals performed by CodePeer.
749 Loc : constant Source_Ptr := Sloc (N);
750 SCS : constant Boolean :=
751 Get_Comes_From_Source_Default;
754 Set_Comes_From_Source_Default (False);
756 Make_Compilation_Unit (Loc,
757 Context_Items => New_Copy_List (Context_Items (N)),
759 Make_Subprogram_Declaration (Sloc (N),
762 (Specification (Unit_Node))),
764 Make_Compilation_Unit_Aux (Loc));
766 Set_Library_Unit (N, Lib_Unit);
767 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
768 Make_Child_Decl_Unit (N);
769 Semantics (Lib_Unit);
771 -- Now that a separate declaration exists, the body
772 -- of the child unit does not act as spec any longer.
774 Set_Acts_As_Spec (N, False);
775 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
776 Set_Debug_Info_Needed (Defining_Entity (Unit (Lib_Unit)));
777 Set_Comes_From_Source_Default (SCS);
782 -- Here for subprogram with separate declaration
785 Semantics (Lib_Unit);
786 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
787 Version_Update (N, Lib_Unit);
790 -- If this is a child unit, generate references to the parents
792 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
793 N_Defining_Program_Unit_Name
795 Generate_Parent_References (
796 Specification (Unit_Node),
797 Scope (Defining_Entity (Unit (Lib_Unit))));
801 -- If it is a child unit, the parent must be elaborated first and we
802 -- update version, since we are dependent on our parent.
804 if Is_Child_Spec (Unit_Node) then
806 -- The analysis of the parent is done with style checks off
809 Save_Style_Check : constant Boolean := Style_Check;
810 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
811 Cunit_Boolean_Restrictions_Save;
814 if not GNAT_Mode then
815 Style_Check := False;
818 Semantics (Parent_Spec (Unit_Node));
819 Version_Update (N, Parent_Spec (Unit_Node));
820 Style_Check := Save_Style_Check;
821 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
825 -- With the analysis done, install the context. Note that we can't
826 -- install the context from the with clauses as we analyze them, because
827 -- each with clause must be analyzed in a clean visibility context, so
828 -- we have to wait and install them all at once.
832 if Is_Child_Spec (Unit_Node) then
834 -- Set the entities of all parents in the program_unit_name
836 Generate_Parent_References (
837 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
840 -- All components of the context: with-clauses, library unit, ancestors
841 -- if any, (and their context) are analyzed and installed.
843 -- Call special debug routine sm if this is the main unit
845 if Current_Sem_Unit = Main_Unit then
849 -- Now analyze the unit (package, subprogram spec, body) itself
853 if Warn_On_Redundant_Constructs then
854 Check_Redundant_Withs (Context_Items (N));
856 if Nkind (Unit_Node) = N_Package_Body then
857 Check_Redundant_Withs
858 (Context_Items => Context_Items (N),
859 Spec_Context_Items => Context_Items (Lib_Unit));
863 -- The above call might have made Unit_Node an N_Subprogram_Body from
864 -- something else, so propagate any Acts_As_Spec flag.
866 if Nkind (Unit_Node) = N_Subprogram_Body
867 and then Acts_As_Spec (Unit_Node)
869 Set_Acts_As_Spec (N);
872 -- Register predefined units in Rtsfind
875 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
877 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
878 Set_RTU_Loaded (Unit_Node);
882 -- Treat compilation unit pragmas that appear after the library unit
884 if Present (Pragmas_After (Aux_Decls_Node (N))) then
886 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
888 while Present (Prag_Node) loop
895 -- Generate distribution stubs if requested and no error
898 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
900 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
901 and then not Fatal_Error (Main_Unit)
903 if Is_RCI_Pkg_Spec_Or_Body (N) then
905 -- Regular RCI package
907 Add_Stub_Constructs (N);
909 elsif (Nkind (Unit_Node) = N_Package_Declaration
910 and then Is_Shared_Passive (Defining_Entity
911 (Specification (Unit_Node))))
912 or else (Nkind (Unit_Node) = N_Package_Body
914 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
916 -- Shared passive package
918 Add_Stub_Constructs (N);
920 elsif Nkind (Unit_Node) = N_Package_Instantiation
922 Is_Remote_Call_Interface
923 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
925 -- Instantiation of a RCI generic package
927 Add_Stub_Constructs (N);
931 -- Remove unit from visibility, so that environment is clean for
932 -- the next compilation, which is either the main unit or some
933 -- other unit in the context.
935 if Nkind_In (Unit_Node, N_Package_Declaration,
936 N_Package_Renaming_Declaration,
937 N_Subprogram_Declaration)
938 or else Nkind (Unit_Node) in N_Generic_Declaration
940 (Nkind (Unit_Node) = N_Subprogram_Body
941 and then Acts_As_Spec (Unit_Node))
943 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
945 -- If the unit is an instantiation whose body will be elaborated for
946 -- inlining purposes, use the proper entity of the instance. The
947 -- entity may be missing if the instantiation was illegal.
949 elsif Nkind (Unit_Node) = N_Package_Instantiation
950 and then not Error_Posted (Unit_Node)
951 and then Present (Instance_Spec (Unit_Node))
953 Remove_Unit_From_Visibility
954 (Defining_Entity (Instance_Spec (Unit_Node)));
956 elsif Nkind (Unit_Node) = N_Package_Body
957 or else (Nkind (Unit_Node) = N_Subprogram_Body
958 and then not Acts_As_Spec (Unit_Node))
960 -- Bodies that are not the main unit are compiled if they are generic
961 -- or contain generic or inlined units. Their analysis brings in the
962 -- context of the corresponding spec (unit declaration) which must be
963 -- removed as well, to return the compilation environment to its
966 Remove_Context (Lib_Unit);
967 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
970 -- Last step is to deinstall the context we just installed as well as
971 -- the unit just compiled.
975 -- If this is the main unit and we are generating code, we must check
976 -- that all generic units in the context have a body if they need it,
977 -- even if they have not been instantiated. In the absence of .ali files
978 -- for generic units, we must force the load of the body, just to
979 -- produce the proper error if the body is absent. We skip this
980 -- verification if the main unit itself is generic.
982 if Get_Cunit_Unit_Number (N) = Main_Unit
983 and then Operating_Mode = Generate_Code
984 and then Expander_Active
986 -- Check whether the source for the body of the unit must be included
987 -- in a standalone library.
989 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
991 -- Indicate that the main unit is now analyzed, to catch possible
992 -- circularities between it and generic bodies. Remove main unit from
993 -- visibility. This might seem superfluous, but the main unit must
994 -- not be visible in the generic body expansions that follow.
996 Set_Analyzed (N, True);
997 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
1002 Un : Unit_Number_Type;
1004 Save_Style_Check : constant Boolean := Style_Check;
1005 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
1006 Cunit_Boolean_Restrictions_Save;
1009 Item := First (Context_Items (N));
1010 while Present (Item) loop
1012 -- Check for explicit with clause
1014 if Nkind (Item) = N_With_Clause
1015 and then not Implicit_With (Item)
1017 -- Ada 2005 (AI-50217): Ignore limited-withed units
1019 and then not Limited_Present (Item)
1021 Nam := Entity (Name (Item));
1023 -- Compile generic subprogram, unless it is intrinsic or
1024 -- imported so no body is required, or generic package body
1025 -- if the package spec requires a body.
1027 if (Is_Generic_Subprogram (Nam)
1028 and then not Is_Intrinsic_Subprogram (Nam)
1029 and then not Is_Imported (Nam))
1030 or else (Ekind (Nam) = E_Generic_Package
1031 and then Unit_Requires_Body (Nam))
1033 Style_Check := False;
1035 if Present (Renamed_Object (Nam)) then
1038 (Load_Name => Get_Body_Name
1040 (Unit_Declaration_Node
1041 (Renamed_Object (Nam)))),
1049 (Load_Name => Get_Body_Name
1050 (Get_Unit_Name (Item)),
1057 if Un = No_Unit then
1059 ("body of generic unit& not found", Item, Nam);
1062 elsif not Analyzed (Cunit (Un))
1063 and then Un /= Main_Unit
1064 and then not Fatal_Error (Un)
1066 Style_Check := False;
1067 Semantics (Cunit (Un));
1075 Style_Check := Save_Style_Check;
1076 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
1080 -- Deal with creating elaboration Boolean if needed. We create an
1081 -- elaboration boolean only for units that come from source since
1082 -- units manufactured by the compiler never need elab checks.
1084 if Comes_From_Source (N)
1085 and then Nkind_In (Unit_Node, N_Package_Declaration,
1086 N_Generic_Package_Declaration,
1087 N_Subprogram_Declaration,
1088 N_Generic_Subprogram_Declaration)
1091 Loc : constant Source_Ptr := Sloc (N);
1092 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1095 Spec_Id := Defining_Entity (Unit_Node);
1096 Generate_Definition (Spec_Id);
1098 -- See if an elaboration entity is required for possible access
1099 -- before elaboration checking. Note that we must allow for this
1100 -- even if -gnatE is not set, since a client may be compiled in
1101 -- -gnatE mode and reference the entity.
1103 -- These entities are also used by the binder to prevent multiple
1104 -- attempts to execute the elaboration code for the library case
1105 -- where the elaboration routine might otherwise be called more
1108 -- Case of units which do not require elaboration checks
1111 -- Pure units do not need checks
1115 -- Preelaborated units do not need checks
1117 or else Is_Preelaborated (Spec_Id)
1119 -- No checks needed if pragma Elaborate_Body present
1121 or else Has_Pragma_Elaborate_Body (Spec_Id)
1123 -- No checks needed if unit does not require a body
1125 or else not Unit_Requires_Body (Spec_Id)
1127 -- No checks needed for predefined files
1129 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1131 -- No checks required if no separate spec
1133 or else Acts_As_Spec (N)
1135 -- This is a case where we only need the entity for
1136 -- checking to prevent multiple elaboration checks.
1138 Set_Elaboration_Entity_Required (Spec_Id, False);
1140 -- Case of elaboration entity is required for access before
1141 -- elaboration checking (so certainly we must build it!)
1144 Set_Elaboration_Entity_Required (Spec_Id, True);
1147 Build_Elaboration_Entity (N, Spec_Id);
1151 -- Freeze the compilation unit entity. This for sure is needed because
1152 -- of some warnings that can be output (see Freeze_Subprogram), but may
1153 -- in general be required. If freezing actions result, place them in the
1154 -- compilation unit actions list, and analyze them.
1157 Loc : constant Source_Ptr := Sloc (N);
1158 L : constant List_Id :=
1159 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), Loc);
1161 while Is_Non_Empty_List (L) loop
1162 Insert_Library_Level_Action (Remove_Head (L));
1168 if Nkind (Unit_Node) = N_Package_Declaration
1169 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1170 and then Expander_Active
1173 Save_Style_Check : constant Boolean := Style_Check;
1174 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1175 Options : Style_Check_Options;
1178 Save_Style_Check_Options (Options);
1179 Reset_Style_Check_Options;
1180 Opt.Warning_Mode := Suppress;
1181 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1183 Reset_Style_Check_Options;
1184 Set_Style_Check_Options (Options);
1185 Style_Check := Save_Style_Check;
1186 Warning_Mode := Save_Warning;
1190 -- If we are generating obsolescent warnings, then here is where we
1191 -- generate them for the with'ed items. The reason for this special
1192 -- processing is that the normal mechanism of generating the warnings
1193 -- for referenced entities does not work for context clause references.
1194 -- That's because when we first analyze the context, it is too early to
1195 -- know if the with'ing unit is itself obsolescent (which suppresses
1198 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1200 -- Push current compilation unit as scope, so that the test for
1201 -- being within an obsolescent unit will work correctly.
1203 Push_Scope (Defining_Entity (Unit_Node));
1205 -- Loop through context items to deal with with clauses
1213 Item := First (Context_Items (N));
1214 while Present (Item) loop
1215 if Nkind (Item) = N_With_Clause
1217 -- Suppress this check in limited-withed units. Further work
1218 -- needed here if we decide to incorporate this check on
1219 -- limited-withed units.
1221 and then not Limited_Present (Item)
1224 Ent := Entity (Nam);
1226 if Is_Obsolescent (Ent) then
1227 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1235 -- Remove temporary install of current unit as scope
1239 end Analyze_Compilation_Unit;
1241 ---------------------
1242 -- Analyze_Context --
1243 ---------------------
1245 procedure Analyze_Context (N : Node_Id) is
1246 Ukind : constant Node_Kind := Nkind (Unit (N));
1250 -- First process all configuration pragmas at the start of the context
1251 -- items. Strictly these are not part of the context clause, but that
1252 -- is where the parser puts them. In any case for sure we must analyze
1253 -- these before analyzing the actual context items, since they can have
1254 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1255 -- be with'ed as a result of changing categorizations in Ada 2005).
1257 Item := First (Context_Items (N));
1258 while Present (Item)
1259 and then Nkind (Item) = N_Pragma
1260 and then Pragma_Name (Item) in Configuration_Pragma_Names
1266 -- This is the point at which we capture the configuration settings
1267 -- for the unit. At the moment only the Optimize_Alignment setting
1268 -- needs to be captured. Probably more later ???
1270 if Optimize_Alignment_Local then
1271 Set_OA_Setting (Current_Sem_Unit, 'L');
1273 Set_OA_Setting (Current_Sem_Unit, Optimize_Alignment);
1276 -- Loop through actual context items. This is done in two passes:
1278 -- a) The first pass analyzes non-limited with-clauses and also any
1279 -- configuration pragmas (we need to get the latter analyzed right
1280 -- away, since they can affect processing of subsequent items.
1282 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1284 while Present (Item) loop
1286 -- For with clause, analyze the with clause, and then update
1287 -- the version, since we are dependent on a unit that we with.
1289 if Nkind (Item) = N_With_Clause
1290 and then not Limited_Present (Item)
1292 -- Skip analyzing with clause if no unit, nothing to do (this
1293 -- happens for a with that references a non-existent unit)
1294 -- Skip as well if this is a with_clause for the main unit, which
1295 -- happens if a subunit has a useless with_clause on its parent.
1297 if Present (Library_Unit (Item)) then
1298 if Library_Unit (Item) /= Cunit (Current_Sem_Unit) then
1302 Set_Entity (Name (Item), Cunit_Entity (Current_Sem_Unit));
1306 if not Implicit_With (Item) then
1307 Version_Update (N, Library_Unit (Item));
1310 -- Skip pragmas. Configuration pragmas at the start were handled in
1311 -- the loop above, and remaining pragmas are not processed until we
1312 -- actually install the context (see Install_Context). We delay the
1313 -- analysis of these pragmas to make sure that we have installed all
1314 -- the implicit with's on parent units.
1316 -- Skip use clauses at this stage, since we don't want to do any
1317 -- installing of potentially use-visible entities until we
1318 -- actually install the complete context (in Install_Context).
1319 -- Otherwise things can get installed in the wrong context.
1328 -- Second pass: examine all limited_with clauses. All other context
1329 -- items are ignored in this pass.
1331 Item := First (Context_Items (N));
1332 while Present (Item) loop
1333 if Nkind (Item) = N_With_Clause
1334 and then Limited_Present (Item)
1336 -- No need to check errors on implicitly generated limited-with
1339 if not Implicit_With (Item) then
1341 -- Verify that the illegal contexts given in 10.1.2 (18/2)
1342 -- are properly rejected, including renaming declarations.
1344 if not Nkind_In (Ukind, N_Package_Declaration,
1345 N_Subprogram_Declaration)
1346 and then Ukind not in N_Generic_Declaration
1347 and then Ukind not in N_Generic_Instantiation
1349 Error_Msg_N ("limited with_clause not allowed here", Item);
1351 -- Check wrong use of a limited with clause applied to the
1352 -- compilation unit containing the limited-with clause.
1354 -- limited with P.Q;
1355 -- package P.Q is ...
1357 elsif Unit (Library_Unit (Item)) = Unit (N) then
1358 Error_Msg_N ("wrong use of limited-with clause", Item);
1360 -- Check wrong use of limited-with clause applied to some
1361 -- immediate ancestor.
1363 elsif Is_Child_Spec (Unit (N)) then
1365 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1369 P := Parent_Spec (Unit (N));
1371 if Unit (P) = Lib_U then
1372 Error_Msg_N ("limited with_clause of immediate "
1373 & "ancestor not allowed", Item);
1377 exit when not Is_Child_Spec (Unit (P));
1378 P := Parent_Spec (Unit (P));
1383 -- Check if the limited-withed unit is already visible through
1384 -- some context clause of the current compilation unit or some
1385 -- ancestor of the current compilation unit.
1388 Lim_Unit_Name : constant Node_Id := Name (Item);
1389 Comp_Unit : Node_Id;
1391 Unit_Name : Node_Id;
1396 It := First (Context_Items (Comp_Unit));
1397 while Present (It) loop
1399 and then Nkind (It) = N_With_Clause
1400 and then not Limited_Present (It)
1402 Nkind_In (Unit (Library_Unit (It)),
1403 N_Package_Declaration,
1404 N_Package_Renaming_Declaration)
1406 if Nkind (Unit (Library_Unit (It))) =
1407 N_Package_Declaration
1409 Unit_Name := Name (It);
1411 Unit_Name := Name (Unit (Library_Unit (It)));
1414 -- Check if the named package (or some ancestor)
1415 -- leaves visible the full-view of the unit given
1416 -- in the limited-with clause
1419 if Designate_Same_Unit (Lim_Unit_Name,
1422 Error_Msg_Sloc := Sloc (It);
1424 ("simultaneous visibility of limited "
1425 & "and unlimited views not allowed",
1428 ("\unlimited view visible through "
1429 & "context clause #",
1433 elsif Nkind (Unit_Name) = N_Identifier then
1437 Unit_Name := Prefix (Unit_Name);
1444 exit when not Is_Child_Spec (Unit (Comp_Unit));
1446 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1451 -- Skip analyzing with clause if no unit, see above
1453 if Present (Library_Unit (Item)) then
1457 -- A limited_with does not impose an elaboration order, but
1458 -- there is a semantic dependency for recompilation purposes.
1460 if not Implicit_With (Item) then
1461 Version_Update (N, Library_Unit (Item));
1464 -- Pragmas and use clauses and with clauses other than limited
1465 -- with's are ignored in this pass through the context items.
1473 end Analyze_Context;
1475 -------------------------------
1476 -- Analyze_Package_Body_Stub --
1477 -------------------------------
1479 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1480 Id : constant Entity_Id := Defining_Identifier (N);
1484 -- The package declaration must be in the current declarative part
1486 Check_Stub_Level (N);
1487 Nam := Current_Entity_In_Scope (Id);
1489 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1490 Error_Msg_N ("missing specification for package stub", N);
1492 elsif Has_Completion (Nam)
1493 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1495 Error_Msg_N ("duplicate or redundant stub for package", N);
1498 -- Indicate that the body of the package exists. If we are doing
1499 -- only semantic analysis, the stub stands for the body. If we are
1500 -- generating code, the existence of the body will be confirmed
1501 -- when we load the proper body.
1503 Set_Has_Completion (Nam);
1504 Set_Scope (Defining_Entity (N), Current_Scope);
1505 Generate_Reference (Nam, Id, 'b');
1506 Analyze_Proper_Body (N, Nam);
1508 end Analyze_Package_Body_Stub;
1510 -------------------------
1511 -- Analyze_Proper_Body --
1512 -------------------------
1514 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1515 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1516 Unum : Unit_Number_Type;
1518 procedure Optional_Subunit;
1519 -- This procedure is called when the main unit is a stub, or when we
1520 -- are not generating code. In such a case, we analyze the subunit if
1521 -- present, which is user-friendly and in fact required for ASIS, but
1522 -- we don't complain if the subunit is missing.
1524 ----------------------
1525 -- Optional_Subunit --
1526 ----------------------
1528 procedure Optional_Subunit is
1529 Comp_Unit : Node_Id;
1532 -- Try to load subunit, but ignore any errors that occur during
1533 -- the loading of the subunit, by using the special feature in
1534 -- Errout to ignore all errors. Note that Fatal_Error will still
1535 -- be set, so we will be able to check for this case below.
1537 if not ASIS_Mode then
1538 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1543 (Load_Name => Subunit_Name,
1548 if not ASIS_Mode then
1549 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1552 -- All done if we successfully loaded the subunit
1555 and then (not Fatal_Error (Unum) or else Try_Semantics)
1557 Comp_Unit := Cunit (Unum);
1559 -- If the file was empty or seriously mangled, the unit
1560 -- itself may be missing.
1562 if No (Unit (Comp_Unit)) then
1564 ("subunit does not contain expected proper body", N);
1566 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1568 ("expected SEPARATE subunit, found child unit",
1569 Cunit_Entity (Unum));
1571 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1572 Analyze_Subunit (Comp_Unit);
1573 Set_Library_Unit (N, Comp_Unit);
1576 elsif Unum = No_Unit
1577 and then Present (Nam)
1579 if Is_Protected_Type (Nam) then
1580 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1582 Set_Corresponding_Body (
1583 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1586 end Optional_Subunit;
1588 -- Start of processing for Analyze_Proper_Body
1591 -- If the subunit is already loaded, it means that the main unit
1592 -- is a subunit, and that the current unit is one of its parents
1593 -- which was being analyzed to provide the needed context for the
1594 -- analysis of the subunit. In this case we analyze the subunit and
1595 -- continue with the parent, without looking a subsequent subunits.
1597 if Is_Loaded (Subunit_Name) then
1599 -- If the proper body is already linked to the stub node,
1600 -- the stub is in a generic unit and just needs analyzing.
1602 if Present (Library_Unit (N)) then
1603 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1604 Analyze_Subunit (Library_Unit (N));
1606 -- Otherwise we must load the subunit and link to it
1609 -- Load the subunit, this must work, since we originally
1610 -- loaded the subunit earlier on. So this will not really
1611 -- load it, just give access to it.
1615 (Load_Name => Subunit_Name,
1620 -- And analyze the subunit in the parent context (note that we
1621 -- do not call Semantics, since that would remove the parent
1622 -- context). Because of this, we have to manually reset the
1623 -- compiler state to Analyzing since it got destroyed by Load.
1625 if Unum /= No_Unit then
1626 Compiler_State := Analyzing;
1628 -- Check that the proper body is a subunit and not a child
1629 -- unit. If the unit was previously loaded, the error will
1630 -- have been emitted when copying the generic node, so we
1631 -- just return to avoid cascaded errors.
1633 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1637 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1638 Analyze_Subunit (Cunit (Unum));
1639 Set_Library_Unit (N, Cunit (Unum));
1643 -- If the main unit is a subunit, then we are just performing semantic
1644 -- analysis on that subunit, and any other subunits of any parent unit
1645 -- should be ignored, except that if we are building trees for ASIS
1646 -- usage we want to annotate the stub properly.
1648 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1649 and then Subunit_Name /= Unit_Name (Main_Unit)
1655 -- But before we return, set the flag for unloaded subunits. This
1656 -- will suppress junk warnings of variables in the same declarative
1657 -- part (or a higher level one) that are in danger of looking unused
1658 -- when in fact there might be a declaration in the subunit that we
1659 -- do not intend to load.
1661 Unloaded_Subunits := True;
1664 -- If the subunit is not already loaded, and we are generating code,
1665 -- then this is the case where compilation started from the parent,
1666 -- and we are generating code for an entire subunit tree. In that
1667 -- case we definitely need to load the subunit.
1669 -- In order to continue the analysis with the rest of the parent,
1670 -- and other subunits, we load the unit without requiring its
1671 -- presence, and emit a warning if not found, rather than terminating
1672 -- the compilation abruptly, as for other missing file problems.
1674 elsif Original_Operating_Mode = Generate_Code then
1676 -- If the proper body is already linked to the stub node,
1677 -- the stub is in a generic unit and just needs analyzing.
1679 -- We update the version. Although we are not technically
1680 -- semantically dependent on the subunit, given our approach
1681 -- of macro substitution of subunits, it makes sense to
1682 -- include it in the version identification.
1684 if Present (Library_Unit (N)) then
1685 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1686 Analyze_Subunit (Library_Unit (N));
1687 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1689 -- Otherwise we must load the subunit and link to it
1694 (Load_Name => Subunit_Name,
1699 -- Give message if we did not get the unit
1701 if Original_Operating_Mode = Generate_Code
1702 and then Unum = No_Unit
1704 Error_Msg_Unit_1 := Subunit_Name;
1706 Get_File_Name (Subunit_Name, Subunit => True);
1708 ("subunit$$ in file{ not found?", N);
1709 Subunits_Missing := True;
1712 -- Load_Unit may reset Compiler_State, since it may have been
1713 -- necessary to parse an additional units, so we make sure
1714 -- that we reset it to the Analyzing state.
1716 Compiler_State := Analyzing;
1718 if Unum /= No_Unit then
1719 if Debug_Flag_L then
1720 Write_Str ("*** Loaded subunit from stub. Analyze");
1725 Comp_Unit : constant Node_Id := Cunit (Unum);
1728 -- Check for child unit instead of subunit
1730 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1732 ("expected SEPARATE subunit, found child unit",
1733 Cunit_Entity (Unum));
1735 -- OK, we have a subunit
1738 -- Set corresponding stub (even if errors)
1740 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1742 -- Collect SCO information for loaded subunit if we are
1743 -- in the main unit).
1747 In_Extended_Main_Source_Unit
1748 (Cunit_Entity (Current_Sem_Unit))
1753 -- Analyze the unit if semantics active
1755 if not Fatal_Error (Unum) or else Try_Semantics then
1756 Analyze_Subunit (Comp_Unit);
1759 -- Set the library unit pointer in any case
1761 Set_Library_Unit (N, Comp_Unit);
1763 -- We update the version. Although we are not technically
1764 -- semantically dependent on the subunit, given our
1765 -- approach of macro substitution of subunits, it makes
1766 -- sense to include it in the version identification.
1768 Version_Update (Cunit (Main_Unit), Comp_Unit);
1774 -- The remaining case is when the subunit is not already loaded and
1775 -- we are not generating code. In this case we are just performing
1776 -- semantic analysis on the parent, and we are not interested in
1777 -- the subunit. For subprograms, analyze the stub as a body. For
1778 -- other entities the stub has already been marked as completed.
1783 end Analyze_Proper_Body;
1785 ----------------------------------
1786 -- Analyze_Protected_Body_Stub --
1787 ----------------------------------
1789 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1790 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1793 Check_Stub_Level (N);
1795 -- First occurrence of name may have been as an incomplete type
1797 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1798 Nam := Full_View (Nam);
1802 or else not Is_Protected_Type (Etype (Nam))
1804 Error_Msg_N ("missing specification for Protected body", N);
1806 Set_Scope (Defining_Entity (N), Current_Scope);
1807 Set_Has_Completion (Etype (Nam));
1808 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1809 Analyze_Proper_Body (N, Etype (Nam));
1811 end Analyze_Protected_Body_Stub;
1813 ----------------------------------
1814 -- Analyze_Subprogram_Body_Stub --
1815 ----------------------------------
1817 -- A subprogram body stub can appear with or without a previous
1818 -- specification. If there is one, the analysis of the body will
1819 -- find it and verify conformance. The formals appearing in the
1820 -- specification of the stub play no role, except for requiring an
1821 -- additional conformance check. If there is no previous subprogram
1822 -- declaration, the stub acts as a spec, and provides the defining
1823 -- entity for the subprogram.
1825 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1829 Check_Stub_Level (N);
1831 -- Verify that the identifier for the stub is unique within this
1832 -- declarative part.
1834 if Nkind_In (Parent (N), N_Block_Statement,
1838 Decl := First (Declarations (Parent (N)));
1839 while Present (Decl)
1842 if Nkind (Decl) = N_Subprogram_Body_Stub
1843 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1844 Chars (Defining_Unit_Name (Specification (N))))
1846 Error_Msg_N ("identifier for stub is not unique", N);
1853 -- Treat stub as a body, which checks conformance if there is a previous
1854 -- declaration, or else introduces entity and its signature.
1856 Analyze_Subprogram_Body (N);
1857 Analyze_Proper_Body (N, Empty);
1858 end Analyze_Subprogram_Body_Stub;
1860 ---------------------
1861 -- Analyze_Subunit --
1862 ---------------------
1864 -- A subunit is compiled either by itself (for semantic checking)
1865 -- or as part of compiling the parent (for code generation). In
1866 -- either case, by the time we actually process the subunit, the
1867 -- parent has already been installed and analyzed. The node N is
1868 -- a compilation unit, whose context needs to be treated here,
1869 -- because we come directly here from the parent without calling
1870 -- Analyze_Compilation_Unit.
1872 -- The compilation context includes the explicit context of the
1873 -- subunit, and the context of the parent, together with the parent
1874 -- itself. In order to compile the current context, we remove the
1875 -- one inherited from the parent, in order to have a clean visibility
1876 -- table. We restore the parent context before analyzing the proper
1877 -- body itself. On exit, we remove only the explicit context of the
1880 procedure Analyze_Subunit (N : Node_Id) is
1881 Lib_Unit : constant Node_Id := Library_Unit (N);
1882 Par_Unit : constant Entity_Id := Current_Scope;
1884 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1885 Num_Scopes : Int := 0;
1886 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1887 Enclosing_Child : Entity_Id := Empty;
1888 Svg : constant Suppress_Array := Scope_Suppress;
1890 procedure Analyze_Subunit_Context;
1891 -- Capture names in use clauses of the subunit. This must be done
1892 -- before re-installing parent declarations, because items in the
1893 -- context must not be hidden by declarations local to the parent.
1895 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1896 -- Recursive procedure to restore scope of all ancestors of subunit,
1897 -- from outermost in. If parent is not a subunit, the call to install
1898 -- context installs context of spec and (if parent is a child unit)
1899 -- the context of its parents as well. It is confusing that parents
1900 -- should be treated differently in both cases, but the semantics are
1901 -- just not identical.
1903 procedure Re_Install_Use_Clauses;
1904 -- As part of the removal of the parent scope, the use clauses are
1905 -- removed, to be reinstalled when the context of the subunit has
1906 -- been analyzed. Use clauses may also have been affected by the
1907 -- analysis of the context of the subunit, so they have to be applied
1908 -- again, to insure that the compilation environment of the rest of
1909 -- the parent unit is identical.
1911 procedure Remove_Scope;
1912 -- Remove current scope from scope stack, and preserve the list
1913 -- of use clauses in it, to be reinstalled after context is analyzed.
1915 -----------------------------
1916 -- Analyze_Subunit_Context --
1917 -----------------------------
1919 procedure Analyze_Subunit_Context is
1922 Unit_Name : Entity_Id;
1925 Analyze_Context (N);
1927 -- Make withed units immediately visible. If child unit, make the
1928 -- ultimate parent immediately visible.
1930 Item := First (Context_Items (N));
1931 while Present (Item) loop
1932 if Nkind (Item) = N_With_Clause then
1934 -- Protect frontend against previous errors in context clauses
1936 if Nkind (Name (Item)) /= N_Selected_Component then
1937 if Error_Posted (Item) then
1941 Unit_Name := Entity (Name (Item));
1942 while Is_Child_Unit (Unit_Name) loop
1943 Set_Is_Visible_Child_Unit (Unit_Name);
1944 Unit_Name := Scope (Unit_Name);
1947 if not Is_Immediately_Visible (Unit_Name) then
1948 Set_Is_Immediately_Visible (Unit_Name);
1949 Set_Context_Installed (Item);
1954 elsif Nkind (Item) = N_Use_Package_Clause then
1955 Nam := First (Names (Item));
1956 while Present (Nam) loop
1961 elsif Nkind (Item) = N_Use_Type_Clause then
1962 Nam := First (Subtype_Marks (Item));
1963 while Present (Nam) loop
1972 -- Reset visibility of withed units. They will be made visible
1973 -- again when we install the subunit context.
1975 Item := First (Context_Items (N));
1976 while Present (Item) loop
1977 if Nkind (Item) = N_With_Clause
1979 -- Protect frontend against previous errors in context clauses
1981 and then Nkind (Name (Item)) /= N_Selected_Component
1982 and then not Error_Posted (Item)
1984 Unit_Name := Entity (Name (Item));
1985 while Is_Child_Unit (Unit_Name) loop
1986 Set_Is_Visible_Child_Unit (Unit_Name, False);
1987 Unit_Name := Scope (Unit_Name);
1990 if Context_Installed (Item) then
1991 Set_Is_Immediately_Visible (Unit_Name, False);
1992 Set_Context_Installed (Item, False);
1998 end Analyze_Subunit_Context;
2000 ------------------------
2001 -- Re_Install_Parents --
2002 ------------------------
2004 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
2008 if Nkind (Unit (L)) = N_Subunit then
2009 Re_Install_Parents (Library_Unit (L), Scope (Scop));
2012 Install_Context (L);
2014 -- If the subunit occurs within a child unit, we must restore the
2015 -- immediate visibility of any siblings that may occur in context.
2017 if Present (Enclosing_Child) then
2018 Install_Siblings (Enclosing_Child, L);
2023 if Scop /= Par_Unit then
2024 Set_Is_Immediately_Visible (Scop);
2027 -- Make entities in scope visible again. For child units, restore
2028 -- visibility only if they are actually in context.
2030 E := First_Entity (Current_Scope);
2031 while Present (E) loop
2032 if not Is_Child_Unit (E)
2033 or else Is_Visible_Child_Unit (E)
2035 Set_Is_Immediately_Visible (E);
2041 -- A subunit appears within a body, and for a nested subunits
2042 -- all the parents are bodies. Restore full visibility of their
2043 -- private entities.
2045 if Is_Package_Or_Generic_Package (Scop) then
2046 Set_In_Package_Body (Scop);
2047 Install_Private_Declarations (Scop);
2049 end Re_Install_Parents;
2051 ----------------------------
2052 -- Re_Install_Use_Clauses --
2053 ----------------------------
2055 procedure Re_Install_Use_Clauses is
2058 for J in reverse 1 .. Num_Scopes loop
2059 U := Use_Clauses (J);
2060 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2061 Install_Use_Clauses (U, Force_Installation => True);
2063 end Re_Install_Use_Clauses;
2069 procedure Remove_Scope is
2073 Num_Scopes := Num_Scopes + 1;
2074 Use_Clauses (Num_Scopes) :=
2075 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2077 E := First_Entity (Current_Scope);
2078 while Present (E) loop
2079 Set_Is_Immediately_Visible (E, False);
2083 if Is_Child_Unit (Current_Scope) then
2084 Enclosing_Child := Current_Scope;
2090 -- Start of processing for Analyze_Subunit
2093 if not Is_Empty_List (Context_Items (N)) then
2095 -- Save current use clauses
2098 Remove_Context (Lib_Unit);
2100 -- Now remove parents and their context, including enclosing
2101 -- subunits and the outer parent body which is not a subunit.
2103 if Present (Lib_Spec) then
2104 Remove_Context (Lib_Spec);
2106 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2107 Lib_Spec := Library_Unit (Lib_Spec);
2109 Remove_Context (Lib_Spec);
2112 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2116 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2117 Remove_Context (Library_Unit (Lib_Spec));
2121 Set_Is_Immediately_Visible (Par_Unit, False);
2123 Analyze_Subunit_Context;
2125 Re_Install_Parents (Lib_Unit, Par_Unit);
2126 Set_Is_Immediately_Visible (Par_Unit);
2128 -- If the context includes a child unit of the parent of the
2129 -- subunit, the parent will have been removed from visibility,
2130 -- after compiling that cousin in the context. The visibility
2131 -- of the parent must be restored now. This also applies if the
2132 -- context includes another subunit of the same parent which in
2133 -- turn includes a child unit in its context.
2135 if Is_Package_Or_Generic_Package (Par_Unit) then
2136 if not Is_Immediately_Visible (Par_Unit)
2137 or else (Present (First_Entity (Par_Unit))
2138 and then not Is_Immediately_Visible
2139 (First_Entity (Par_Unit)))
2141 Set_Is_Immediately_Visible (Par_Unit);
2142 Install_Visible_Declarations (Par_Unit);
2143 Install_Private_Declarations (Par_Unit);
2147 Re_Install_Use_Clauses;
2148 Install_Context (N);
2150 -- Restore state of suppress flags for current body
2152 Scope_Suppress := Svg;
2154 -- If the subunit is within a child unit, then siblings of any
2155 -- parent unit that appear in the context clause of the subunit
2156 -- must also be made immediately visible.
2158 if Present (Enclosing_Child) then
2159 Install_Siblings (Enclosing_Child, N);
2164 Analyze (Proper_Body (Unit (N)));
2167 -- The subunit may contain a with_clause on a sibling of some
2168 -- ancestor. Removing the context will remove from visibility those
2169 -- ancestor child units, which must be restored to the visibility
2170 -- they have in the enclosing body.
2172 if Present (Enclosing_Child) then
2178 and then Is_Child_Unit (C)
2180 Set_Is_Immediately_Visible (C);
2181 Set_Is_Visible_Child_Unit (C);
2186 end Analyze_Subunit;
2188 ----------------------------
2189 -- Analyze_Task_Body_Stub --
2190 ----------------------------
2192 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2193 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2194 Loc : constant Source_Ptr := Sloc (N);
2197 Check_Stub_Level (N);
2199 -- First occurrence of name may have been as an incomplete type
2201 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2202 Nam := Full_View (Nam);
2206 or else not Is_Task_Type (Etype (Nam))
2208 Error_Msg_N ("missing specification for task body", N);
2210 Set_Scope (Defining_Entity (N), Current_Scope);
2211 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2212 Set_Has_Completion (Etype (Nam));
2213 Analyze_Proper_Body (N, Etype (Nam));
2215 -- Set elaboration flag to indicate that entity is callable.
2216 -- This cannot be done in the expansion of the body itself,
2217 -- because the proper body is not in a declarative part. This
2218 -- is only done if expansion is active, because the context
2219 -- may be generic and the flag not defined yet.
2221 if Expander_Active then
2223 Make_Assignment_Statement (Loc,
2225 Make_Identifier (Loc,
2226 New_External_Name (Chars (Etype (Nam)), 'E')),
2227 Expression => New_Reference_To (Standard_True, Loc)));
2231 end Analyze_Task_Body_Stub;
2233 -------------------------
2234 -- Analyze_With_Clause --
2235 -------------------------
2237 -- Analyze the declaration of a unit in a with clause. At end,
2238 -- label the with clause with the defining entity for the unit.
2240 procedure Analyze_With_Clause (N : Node_Id) is
2242 -- Retrieve the original kind of the unit node, before analysis.
2243 -- If it is a subprogram instantiation, its analysis below will
2244 -- rewrite as the declaration of the wrapper package. If the same
2245 -- instantiation appears indirectly elsewhere in the context, it
2246 -- will have been analyzed already.
2248 Unit_Kind : constant Node_Kind :=
2249 Nkind (Original_Node (Unit (Library_Unit (N))));
2250 Nam : constant Node_Id := Name (N);
2252 Par_Name : Entity_Id;
2257 -- Set True if the unit currently being compiled is an internal unit
2259 Save_Style_Check : constant Boolean := Opt.Style_Check;
2260 Save_C_Restrict : constant Save_Cunit_Boolean_Restrictions :=
2261 Cunit_Boolean_Restrictions_Save;
2264 U := Unit (Library_Unit (N));
2266 -- Several actions are skipped for dummy packages (those supplied for
2267 -- with's where no matching file could be found). Such packages are
2268 -- identified by the Sloc value being set to No_Location.
2270 if Limited_Present (N) then
2272 -- Ada 2005 (AI-50217): Build visibility structures but do not
2273 -- analyze the unit.
2275 if Sloc (U) /= No_Location then
2276 Build_Limited_Views (N);
2282 -- We reset ordinary style checking during the analysis of a with'ed
2283 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2284 -- definitely *does* apply to with'ed units).
2286 if not GNAT_Mode then
2287 Style_Check := False;
2290 -- If the library unit is a predefined unit, and we are in high
2291 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2292 -- for the analysis of the with'ed unit. This mode does not prevent
2293 -- explicit with'ing of run-time units.
2295 if Configurable_Run_Time_Mode
2297 Is_Predefined_File_Name
2298 (Unit_File_Name (Get_Source_Unit (Unit (Library_Unit (N)))))
2300 Configurable_Run_Time_Mode := False;
2301 Semantics (Library_Unit (N));
2302 Configurable_Run_Time_Mode := True;
2305 Semantics (Library_Unit (N));
2308 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2310 if Sloc (U) /= No_Location then
2312 -- Check restrictions, except that we skip the check if this is an
2313 -- internal unit unless we are compiling the internal unit as the
2314 -- main unit. We also skip this for dummy packages.
2316 Check_Restriction_No_Dependence (Nam, N);
2318 if not Intunit or else Current_Sem_Unit = Main_Unit then
2319 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2322 -- Deal with special case of GNAT.Current_Exceptions which interacts
2323 -- with the optimization of local raise statements into gotos.
2325 if Nkind (Nam) = N_Selected_Component
2326 and then Nkind (Prefix (Nam)) = N_Identifier
2327 and then Chars (Prefix (Nam)) = Name_Gnat
2328 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2330 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2332 Check_Restriction (No_Exception_Propagation, N);
2333 Special_Exception_Package_Used := True;
2336 -- Check for inappropriate with of internal implementation unit if we
2337 -- are currently compiling the main unit and the main unit is itself
2338 -- not an internal unit. We do not issue this message for implicit
2339 -- with's generated by the compiler itself.
2341 if Implementation_Unit_Warnings
2342 and then Current_Sem_Unit = Main_Unit
2343 and then not Intunit
2344 and then not Implicit_With (N)
2347 U_Kind : constant Kind_Of_Unit :=
2348 Get_Kind_Of_Unit (Get_Source_Unit (U));
2351 if U_Kind = Implementation_Unit then
2352 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2354 ("\use of this unit is non-portable " &
2355 "and version-dependent?",
2358 elsif U_Kind = Ada_05_Unit
2359 and then Ada_Version < Ada_05
2360 and then Warn_On_Ada_2005_Compatibility
2362 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2368 -- Semantic analysis of a generic unit is performed on a copy of
2369 -- the original tree. Retrieve the entity on which semantic info
2370 -- actually appears.
2372 if Unit_Kind in N_Generic_Declaration then
2373 E_Name := Defining_Entity (U);
2375 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2376 -- the case of an instantiation, semantic analysis above will have
2377 -- replaced the unit by its instantiated version. If the instance body
2378 -- has been generated, the instance now denotes the body entity. For
2379 -- visibility purposes we need the entity of its spec.
2381 elsif (Unit_Kind = N_Package_Instantiation
2382 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2383 N_Package_Instantiation)
2384 and then Nkind (U) = N_Package_Body
2386 E_Name := Corresponding_Spec (U);
2388 elsif Unit_Kind = N_Package_Instantiation
2389 and then Nkind (U) = N_Package_Instantiation
2391 -- If the instance has not been rewritten as a package declaration,
2392 -- then it appeared already in a previous with clause. Retrieve
2393 -- the entity from the previous instance.
2395 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2397 elsif Unit_Kind in N_Subprogram_Instantiation then
2399 -- The visible subprogram is created during instantiation, and is
2400 -- an attribute of the wrapper package. We retrieve the wrapper
2401 -- package directly from the instantiation node. If the instance
2402 -- is inlined the unit is still an instantiation. Otherwise it has
2403 -- been rewritten as the declaration of the wrapper itself.
2405 if Nkind (U) in N_Subprogram_Instantiation then
2408 (Defining_Entity (Specification (Instance_Spec (U))));
2410 E_Name := Related_Instance (Defining_Entity (U));
2413 elsif Unit_Kind = N_Package_Renaming_Declaration
2414 or else Unit_Kind in N_Generic_Renaming_Declaration
2416 E_Name := Defining_Entity (U);
2418 elsif Unit_Kind = N_Subprogram_Body
2419 and then Nkind (Name (N)) = N_Selected_Component
2420 and then not Acts_As_Spec (Library_Unit (N))
2422 -- For a child unit that has no spec, one has been created and
2423 -- analyzed. The entity required is that of the spec.
2425 E_Name := Corresponding_Spec (U);
2428 E_Name := Defining_Entity (U);
2431 if Nkind (Name (N)) = N_Selected_Component then
2433 -- Child unit in a with clause
2435 Change_Selected_Component_To_Expanded_Name (Name (N));
2438 -- Restore style checks and restrictions
2440 Style_Check := Save_Style_Check;
2441 Cunit_Boolean_Restrictions_Restore (Save_C_Restrict);
2443 -- Record the reference, but do NOT set the unit as referenced, we want
2444 -- to consider the unit as unreferenced if this is the only reference
2447 Set_Entity_With_Style_Check (Name (N), E_Name);
2448 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2450 -- Generate references and check No_Dependence restriction for parents
2452 if Is_Child_Unit (E_Name) then
2453 Pref := Prefix (Name (N));
2454 Par_Name := Scope (E_Name);
2455 while Nkind (Pref) = N_Selected_Component loop
2456 Change_Selected_Component_To_Expanded_Name (Pref);
2457 Set_Entity_With_Style_Check (Pref, Par_Name);
2459 Generate_Reference (Par_Name, Pref);
2460 Check_Restriction_No_Dependence (Pref, N);
2461 Pref := Prefix (Pref);
2463 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2464 -- is set to Standard_Standard, and no attempt should be made to
2465 -- further unwind scopes.
2467 if Par_Name /= Standard_Standard then
2468 Par_Name := Scope (Par_Name);
2472 if Present (Entity (Pref))
2473 and then not Analyzed (Parent (Parent (Entity (Pref))))
2475 -- If the entity is set without its unit being compiled, the
2476 -- original parent is a renaming, and Par_Name is the renamed
2477 -- entity. For visibility purposes, we need the original entity,
2478 -- which must be analyzed now because Load_Unit directly retrieves
2479 -- the renamed unit, and the renaming declaration itself has not
2482 Analyze (Parent (Parent (Entity (Pref))));
2483 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2484 Par_Name := Entity (Pref);
2487 Set_Entity_With_Style_Check (Pref, Par_Name);
2488 Generate_Reference (Par_Name, Pref);
2491 -- If the withed unit is System, and a system extension pragma is
2492 -- present, compile the extension now, rather than waiting for a
2493 -- visibility check on a specific entity.
2495 if Chars (E_Name) = Name_System
2496 and then Scope (E_Name) = Standard_Standard
2497 and then Present (System_Extend_Unit)
2498 and then Present_System_Aux (N)
2500 -- If the extension is not present, an error will have been emitted
2505 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2506 -- to private_with units; they will be made visible later (just before
2507 -- the private part is analyzed)
2509 if Private_Present (N) then
2510 Set_Is_Immediately_Visible (E_Name, False);
2512 end Analyze_With_Clause;
2514 ------------------------------
2515 -- Check_Private_Child_Unit --
2516 ------------------------------
2518 procedure Check_Private_Child_Unit (N : Node_Id) is
2519 Lib_Unit : constant Node_Id := Unit (N);
2521 Curr_Unit : Entity_Id;
2522 Sub_Parent : Node_Id;
2523 Priv_Child : Entity_Id;
2524 Par_Lib : Entity_Id;
2527 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2528 -- Returns true if and only if the library unit is declared with
2529 -- an explicit designation of private.
2531 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2532 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2535 return Private_Present (Comp_Unit);
2536 end Is_Private_Library_Unit;
2538 -- Start of processing for Check_Private_Child_Unit
2541 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2542 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2543 Par_Lib := Curr_Unit;
2545 elsif Nkind (Lib_Unit) = N_Subunit then
2547 -- The parent is itself a body. The parent entity is to be found in
2548 -- the corresponding spec.
2550 Sub_Parent := Library_Unit (N);
2551 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2553 -- If the parent itself is a subunit, Curr_Unit is the entity
2554 -- of the enclosing body, retrieve the spec entity which is
2555 -- the proper ancestor we need for the following tests.
2557 if Ekind (Curr_Unit) = E_Package_Body then
2558 Curr_Unit := Spec_Entity (Curr_Unit);
2561 Par_Lib := Curr_Unit;
2564 Curr_Unit := Defining_Entity (Lib_Unit);
2566 Par_Lib := Curr_Unit;
2567 Par_Spec := Parent_Spec (Lib_Unit);
2569 if No (Par_Spec) then
2572 Par_Lib := Defining_Entity (Unit (Par_Spec));
2576 -- Loop through context items
2578 Item := First (Context_Items (N));
2579 while Present (Item) loop
2581 -- Ada 2005 (AI-262): Allow private_with of a private child package
2582 -- in public siblings
2584 if Nkind (Item) = N_With_Clause
2585 and then not Implicit_With (Item)
2586 and then not Limited_Present (Item)
2587 and then Is_Private_Descendant (Entity (Name (Item)))
2589 Priv_Child := Entity (Name (Item));
2592 Curr_Parent : Entity_Id := Par_Lib;
2593 Child_Parent : Entity_Id := Scope (Priv_Child);
2594 Prv_Ancestor : Entity_Id := Child_Parent;
2595 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2598 -- If the child unit is a public child then locate the nearest
2599 -- private ancestor. Child_Parent will then be set to the
2600 -- parent of that ancestor.
2602 if not Is_Private_Library_Unit (Priv_Child) then
2603 while Present (Prv_Ancestor)
2604 and then not Is_Private_Library_Unit (Prv_Ancestor)
2606 Prv_Ancestor := Scope (Prv_Ancestor);
2609 if Present (Prv_Ancestor) then
2610 Child_Parent := Scope (Prv_Ancestor);
2614 while Present (Curr_Parent)
2615 and then Curr_Parent /= Standard_Standard
2616 and then Curr_Parent /= Child_Parent
2619 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2620 Curr_Parent := Scope (Curr_Parent);
2623 if No (Curr_Parent) then
2624 Curr_Parent := Standard_Standard;
2627 if Curr_Parent /= Child_Parent then
2628 if Ekind (Priv_Child) = E_Generic_Package
2629 and then Chars (Priv_Child) in Text_IO_Package_Name
2630 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2633 ("& is a nested package, not a compilation unit",
2634 Name (Item), Priv_Child);
2638 ("unit in with clause is private child unit!", Item);
2640 ("\current unit must also have parent&!",
2641 Item, Child_Parent);
2645 or else Private_Present (Item)
2646 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2647 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2648 and then not Acts_As_Spec (Parent (Lib_Unit)))
2654 ("current unit must also be private descendant of&",
2655 Item, Child_Parent);
2663 end Check_Private_Child_Unit;
2665 ----------------------
2666 -- Check_Stub_Level --
2667 ----------------------
2669 procedure Check_Stub_Level (N : Node_Id) is
2670 Par : constant Node_Id := Parent (N);
2671 Kind : constant Node_Kind := Nkind (Par);
2674 if Nkind_In (Kind, N_Package_Body,
2678 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2682 -- In an instance, a missing stub appears at any level. A warning
2683 -- message will have been emitted already for the missing file.
2685 elsif not In_Instance then
2686 Error_Msg_N ("stub cannot appear in an inner scope", N);
2688 elsif Expander_Active then
2689 Error_Msg_N ("missing proper body", N);
2691 end Check_Stub_Level;
2693 ------------------------
2694 -- Expand_With_Clause --
2695 ------------------------
2697 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2698 Loc : constant Source_Ptr := Sloc (Nam);
2699 Ent : constant Entity_Id := Entity (Nam);
2703 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2704 -- Build name to be used in implicit with_clause. In most cases this
2705 -- is the source name, but if renamings are present we must make the
2706 -- original unit visible, not the one it renames. The entity in the
2707 -- with clause is the renamed unit, but the identifier is the one from
2708 -- the source, which allows us to recover the unit renaming.
2710 ---------------------
2711 -- Build_Unit_Name --
2712 ---------------------
2714 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2716 Renaming : Entity_Id;
2720 if Nkind (Nam) = N_Identifier then
2722 -- If the parent unit P in the name of the with_clause for P.Q
2723 -- is a renaming of package R, then the entity of the parent is
2724 -- set to R, but the identifier retains Chars (P) to be consistent
2725 -- with the source (see details in lib-load). However, the
2726 -- implicit_with_clause for the parent must make the entity for
2727 -- P visible, because P.Q may be used as a prefix within the
2728 -- current unit. The entity for P is the current_entity with that
2729 -- name, because the package renaming declaration for it has just
2730 -- been analyzed. Note that this case can only happen if P.Q has
2731 -- already appeared in a previous with_clause in a related unit,
2732 -- such as the library body of the current unit.
2734 if Chars (Nam) /= Chars (Entity (Nam)) then
2735 Renaming := Current_Entity (Nam);
2736 pragma Assert (Renamed_Entity (Renaming) = Entity (Nam));
2737 return New_Occurrence_Of (Renaming, Loc);
2740 return New_Occurrence_Of (Entity (Nam), Loc);
2744 Ent := Entity (Nam);
2746 if Present (Entity (Selector_Name (Nam)))
2747 and then Chars (Entity (Selector_Name (Nam))) /= Chars (Ent)
2749 Nkind (Unit_Declaration_Node (Entity (Selector_Name (Nam))))
2750 = N_Package_Renaming_Declaration
2752 -- The name in the with_clause is of the form A.B.C, and B
2753 -- is given by a renaming declaration. In that case we may
2754 -- not have analyzed the unit for B, but replaced it directly
2755 -- in lib-load with the unit it renames. We have to make A.B
2756 -- visible, so analyze the declaration for B now, in case it
2757 -- has not been done yet.
2759 Ent := Entity (Selector_Name (Nam));
2762 (Unit_Declaration_Node (Entity (Selector_Name (Nam)))));
2766 Make_Expanded_Name (Loc,
2767 Chars => Chars (Entity (Nam)),
2768 Prefix => Build_Unit_Name (Prefix (Nam)),
2769 Selector_Name => New_Occurrence_Of (Ent, Loc));
2770 Set_Entity (Result, Ent);
2773 end Build_Unit_Name;
2775 -- Start of processing for Expand_With_Clause
2778 New_Nodes_OK := New_Nodes_OK + 1;
2780 Make_With_Clause (Loc,
2781 Name => Build_Unit_Name (Nam));
2783 P := Parent (Unit_Declaration_Node (Ent));
2784 Set_Library_Unit (Withn, P);
2785 Set_Corresponding_Spec (Withn, Ent);
2786 Set_First_Name (Withn, True);
2787 Set_Implicit_With (Withn, True);
2789 -- If the unit is a package declaration, a private_with_clause on a
2790 -- child unit implies that the implicit with on the parent is also
2793 if Nkind (Unit (N)) = N_Package_Declaration then
2794 Set_Private_Present (Withn, Private_Present (Item));
2797 Prepend (Withn, Context_Items (N));
2798 Mark_Rewrite_Insertion (Withn);
2799 Install_Withed_Unit (Withn);
2801 if Nkind (Nam) = N_Expanded_Name then
2802 Expand_With_Clause (Item, Prefix (Nam), N);
2805 New_Nodes_OK := New_Nodes_OK - 1;
2806 end Expand_With_Clause;
2808 -----------------------
2809 -- Get_Parent_Entity --
2810 -----------------------
2812 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
2814 if Nkind (Unit) = N_Package_Body
2815 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
2817 return Defining_Entity
2818 (Specification (Instance_Spec (Original_Node (Unit))));
2819 elsif Nkind (Unit) = N_Package_Instantiation then
2820 return Defining_Entity (Specification (Instance_Spec (Unit)));
2822 return Defining_Entity (Unit);
2824 end Get_Parent_Entity;
2826 ---------------------
2827 -- Has_With_Clause --
2828 ---------------------
2830 function Has_With_Clause
2833 Is_Limited : Boolean := False) return Boolean
2837 function Named_Unit (Clause : Node_Id) return Entity_Id;
2838 -- Return the entity for the unit named in a [limited] with clause
2844 function Named_Unit (Clause : Node_Id) return Entity_Id is
2846 if Nkind (Name (Clause)) = N_Selected_Component then
2847 return Entity (Selector_Name (Name (Clause)));
2849 return Entity (Name (Clause));
2853 -- Start of processing for Has_With_Clause
2856 if Present (Context_Items (C_Unit)) then
2857 Item := First (Context_Items (C_Unit));
2858 while Present (Item) loop
2859 if Nkind (Item) = N_With_Clause
2860 and then Limited_Present (Item) = Is_Limited
2861 and then Named_Unit (Item) = Pack
2871 end Has_With_Clause;
2873 -----------------------------
2874 -- Implicit_With_On_Parent --
2875 -----------------------------
2877 procedure Implicit_With_On_Parent
2878 (Child_Unit : Node_Id;
2881 Loc : constant Source_Ptr := Sloc (N);
2882 P : constant Node_Id := Parent_Spec (Child_Unit);
2883 P_Unit : Node_Id := Unit (P);
2884 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
2887 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
2888 -- Build prefix of child unit name. Recurse if needed
2890 function Build_Unit_Name return Node_Id;
2891 -- If the unit is a child unit, build qualified name with all ancestors
2893 -------------------------
2894 -- Build_Ancestor_Name --
2895 -------------------------
2897 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
2898 P_Ref : constant Node_Id :=
2899 New_Reference_To (Defining_Entity (P), Loc);
2900 P_Spec : Node_Id := P;
2903 -- Ancestor may have been rewritten as a package body. Retrieve
2904 -- the original spec to trace earlier ancestors.
2906 if Nkind (P) = N_Package_Body
2907 and then Nkind (Original_Node (P)) = N_Package_Instantiation
2909 P_Spec := Original_Node (P);
2912 if No (Parent_Spec (P_Spec)) then
2916 Make_Selected_Component (Loc,
2917 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
2918 Selector_Name => P_Ref);
2920 end Build_Ancestor_Name;
2922 ---------------------
2923 -- Build_Unit_Name --
2924 ---------------------
2926 function Build_Unit_Name return Node_Id is
2929 if No (Parent_Spec (P_Unit)) then
2930 return New_Reference_To (P_Name, Loc);
2933 Make_Expanded_Name (Loc,
2934 Chars => Chars (P_Name),
2935 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
2936 Selector_Name => New_Reference_To (P_Name, Loc));
2937 Set_Entity (Result, P_Name);
2940 end Build_Unit_Name;
2942 -- Start of processing for Implicit_With_On_Parent
2945 -- The unit of the current compilation may be a package body that
2946 -- replaces an instance node. In this case we need the original instance
2947 -- node to construct the proper parent name.
2949 if Nkind (P_Unit) = N_Package_Body
2950 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
2952 P_Unit := Original_Node (P_Unit);
2955 -- We add the implicit with if the child unit is the current unit being
2956 -- compiled. If the current unit is a body, we do not want to add an
2957 -- implicit_with a second time to the corresponding spec.
2959 if Nkind (Child_Unit) = N_Package_Declaration
2960 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
2965 New_Nodes_OK := New_Nodes_OK + 1;
2966 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
2968 Set_Library_Unit (Withn, P);
2969 Set_Corresponding_Spec (Withn, P_Name);
2970 Set_First_Name (Withn, True);
2971 Set_Implicit_With (Withn, True);
2973 -- Node is placed at the beginning of the context items, so that
2974 -- subsequent use clauses on the parent can be validated.
2976 Prepend (Withn, Context_Items (N));
2977 Mark_Rewrite_Insertion (Withn);
2978 Install_Withed_Unit (Withn);
2980 if Is_Child_Spec (P_Unit) then
2981 Implicit_With_On_Parent (P_Unit, N);
2984 New_Nodes_OK := New_Nodes_OK - 1;
2985 end Implicit_With_On_Parent;
2991 function In_Chain (E : Entity_Id) return Boolean is
2995 H := Current_Entity (E);
2996 while Present (H) loop
3007 ---------------------
3008 -- Install_Context --
3009 ---------------------
3011 procedure Install_Context (N : Node_Id) is
3012 Lib_Unit : constant Node_Id := Unit (N);
3015 Install_Context_Clauses (N);
3017 if Is_Child_Spec (Lib_Unit) then
3018 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
3021 Install_Limited_Context_Clauses (N);
3022 end Install_Context;
3024 -----------------------------
3025 -- Install_Context_Clauses --
3026 -----------------------------
3028 procedure Install_Context_Clauses (N : Node_Id) is
3029 Lib_Unit : constant Node_Id := Unit (N);
3031 Uname_Node : Entity_Id;
3032 Check_Private : Boolean := False;
3033 Decl_Node : Node_Id;
3034 Lib_Parent : Entity_Id;
3037 -- First skip configuration pragmas at the start of the context. They
3038 -- are not technically part of the context clause, but that's where the
3039 -- parser puts them. Note they were analyzed in Analyze_Context.
3041 Item := First (Context_Items (N));
3042 while Present (Item)
3043 and then Nkind (Item) = N_Pragma
3044 and then Pragma_Name (Item) in Configuration_Pragma_Names
3049 -- Loop through the actual context clause items. We process everything
3050 -- except Limited_With clauses in this routine. Limited_With clauses
3051 -- are separately installed (see Install_Limited_Context_Clauses).
3053 while Present (Item) loop
3055 -- Case of explicit WITH clause
3057 if Nkind (Item) = N_With_Clause
3058 and then not Implicit_With (Item)
3060 if Limited_Present (Item) then
3062 -- Limited withed units will be installed later
3066 -- If Name (Item) is not an entity name, something is wrong, and
3067 -- this will be detected in due course, for now ignore the item
3069 elsif not Is_Entity_Name (Name (Item)) then
3072 elsif No (Entity (Name (Item))) then
3073 Set_Entity (Name (Item), Any_Id);
3077 Uname_Node := Entity (Name (Item));
3079 if Is_Private_Descendant (Uname_Node) then
3080 Check_Private := True;
3083 Install_Withed_Unit (Item);
3085 Decl_Node := Unit_Declaration_Node (Uname_Node);
3087 -- If the unit is a subprogram instance, it appears nested within
3088 -- a package that carries the parent information.
3090 if Is_Generic_Instance (Uname_Node)
3091 and then Ekind (Uname_Node) /= E_Package
3093 Decl_Node := Parent (Parent (Decl_Node));
3096 if Is_Child_Spec (Decl_Node) then
3097 if Nkind (Name (Item)) = N_Expanded_Name then
3098 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3100 -- If not an expanded name, the child unit must be a
3101 -- renaming, nothing to do.
3106 elsif Nkind (Decl_Node) = N_Subprogram_Body
3107 and then not Acts_As_Spec (Parent (Decl_Node))
3108 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3110 Implicit_With_On_Parent
3111 (Unit (Library_Unit (Parent (Decl_Node))), N);
3114 -- Check license conditions unless this is a dummy unit
3116 if Sloc (Library_Unit (Item)) /= No_Location then
3117 License_Check : declare
3119 Withu : constant Unit_Number_Type :=
3120 Get_Source_Unit (Library_Unit (Item));
3122 Withl : constant License_Type :=
3123 License (Source_Index (Withu));
3125 Unitl : constant License_Type :=
3126 License (Source_Index (Current_Sem_Unit));
3128 procedure License_Error;
3129 -- Signal error of bad license
3135 procedure License_Error is
3138 ("?license of with'ed unit & may be inconsistent",
3142 -- Start of processing for License_Check
3145 -- Exclude license check if withed unit is an internal unit.
3146 -- This situation arises e.g. with the GPL version of GNAT.
3148 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3151 -- Otherwise check various cases
3163 if Withl = Restricted then
3167 when Modified_GPL =>
3168 if Withl = Restricted or else Withl = GPL then
3172 when Unrestricted =>
3179 -- Case of USE PACKAGE clause
3181 elsif Nkind (Item) = N_Use_Package_Clause then
3182 Analyze_Use_Package (Item);
3184 -- Case of USE TYPE clause
3186 elsif Nkind (Item) = N_Use_Type_Clause then
3187 Analyze_Use_Type (Item);
3191 elsif Nkind (Item) = N_Pragma then
3199 if Is_Child_Spec (Lib_Unit) then
3201 -- The unit also has implicit with_clauses on its own parents
3203 if No (Context_Items (N)) then
3204 Set_Context_Items (N, New_List);
3207 Implicit_With_On_Parent (Lib_Unit, N);
3210 -- If the unit is a body, the context of the specification must also
3211 -- be installed. That includes private with_clauses in that context.
3213 if Nkind (Lib_Unit) = N_Package_Body
3214 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3215 and then not Acts_As_Spec (N))
3217 Install_Context (Library_Unit (N));
3219 -- Only install private with-clauses of a spec that comes from
3220 -- source, excluding specs created for a subprogram body that is
3223 if Comes_From_Source (Library_Unit (N)) then
3224 Install_Private_With_Clauses
3225 (Defining_Entity (Unit (Library_Unit (N))));
3228 if Is_Child_Spec (Unit (Library_Unit (N))) then
3230 -- If the unit is the body of a public child unit, the private
3231 -- declarations of the parent must be made visible. If the child
3232 -- unit is private, the private declarations have been installed
3233 -- already in the call to Install_Parents for the spec. Installing
3234 -- private declarations must be done for all ancestors of public
3235 -- child units. In addition, sibling units mentioned in the
3236 -- context clause of the body are directly visible.
3244 Lib_Spec := Unit (Library_Unit (N));
3245 while Is_Child_Spec (Lib_Spec) loop
3246 P := Unit (Parent_Spec (Lib_Spec));
3247 P_Name := Defining_Entity (P);
3249 if not (Private_Present (Parent (Lib_Spec)))
3250 and then not In_Private_Part (P_Name)
3252 Install_Private_Declarations (P_Name);
3253 Install_Private_With_Clauses (P_Name);
3254 Set_Use (Private_Declarations (Specification (P)));
3262 -- For a package body, children in context are immediately visible
3264 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3267 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3268 N_Generic_Subprogram_Declaration,
3269 N_Package_Declaration,
3270 N_Subprogram_Declaration)
3272 if Is_Child_Spec (Lib_Unit) then
3273 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3274 Set_Is_Private_Descendant
3275 (Defining_Entity (Lib_Unit),
3276 Is_Private_Descendant (Lib_Parent)
3277 or else Private_Present (Parent (Lib_Unit)));
3280 Set_Is_Private_Descendant
3281 (Defining_Entity (Lib_Unit),
3282 Private_Present (Parent (Lib_Unit)));
3286 if Check_Private then
3287 Check_Private_Child_Unit (N);
3289 end Install_Context_Clauses;
3291 -------------------------------------
3292 -- Install_Limited_Context_Clauses --
3293 -------------------------------------
3295 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3298 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3299 -- Check that the unlimited view of a given compilation_unit is not
3300 -- already visible through "use + renamings".
3302 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3303 -- Check that if a limited_with clause of a given compilation_unit
3304 -- mentions a descendant of a private child of some library unit,
3305 -- then the given compilation_unit shall be the declaration of a
3306 -- private descendant of that library unit, or a public descendant
3307 -- of such. The code is analogous to that of Check_Private_Child_Unit
3308 -- but we cannot use entities on the limited with_clauses because
3309 -- their units have not been analyzed, so we have to climb the tree
3310 -- of ancestors looking for private keywords.
3312 procedure Expand_Limited_With_Clause
3313 (Comp_Unit : Node_Id;
3316 -- If a child unit appears in a limited_with clause, there are implicit
3317 -- limited_with clauses on all parents that are not already visible
3318 -- through a regular with clause. This procedure creates the implicit
3319 -- limited with_clauses for the parents and loads the corresponding
3320 -- units. The shadow entities are created when the inserted clause is
3321 -- analyzed. Implements Ada 2005 (AI-50217).
3323 ---------------------
3324 -- Check_Renamings --
3325 ---------------------
3327 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3336 pragma Assert (Nkind (W) = N_With_Clause);
3338 -- Protect the frontend against previous critical errors
3340 case Nkind (Unit (Library_Unit (W))) is
3341 when N_Subprogram_Declaration |
3342 N_Package_Declaration |
3343 N_Generic_Subprogram_Declaration |
3344 N_Generic_Package_Declaration =>
3351 -- Check "use + renamings"
3353 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3354 Spec := Specification (Unit (P));
3356 Item := First (Visible_Declarations (Spec));
3357 while Present (Item) loop
3359 -- Look only at use package clauses
3361 if Nkind (Item) = N_Use_Package_Clause then
3363 -- Traverse the list of packages
3365 Nam := First (Names (Item));
3366 while Present (Nam) loop
3369 pragma Assert (Present (Parent (E)));
3371 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3372 and then Renamed_Entity (E) = WEnt
3374 -- The unlimited view is visible through use clause and
3375 -- renamings. There is no need to generate the error
3376 -- message here because Is_Visible_Through_Renamings
3377 -- takes care of generating the precise error message.
3381 elsif Nkind (Parent (E)) = N_Package_Specification then
3383 -- The use clause may refer to a local package.
3384 -- Check all the enclosing scopes.
3387 while E2 /= Standard_Standard
3395 ("unlimited view visible through use clause ", W);
3407 -- Recursive call to check all the ancestors
3409 if Is_Child_Spec (Unit (P)) then
3410 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3412 end Check_Renamings;
3414 ---------------------------------------
3415 -- Check_Private_Limited_Withed_Unit --
3416 ---------------------------------------
3418 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3419 Curr_Parent : Node_Id;
3420 Child_Parent : Node_Id;
3421 Curr_Private : Boolean;
3424 -- Compilation unit of the parent of the withed library unit
3426 Child_Parent := Library_Unit (Item);
3428 -- If the child unit is a public child, then locate its nearest
3429 -- private ancestor, if any; Child_Parent will then be set to
3430 -- the parent of that ancestor.
3432 if not Private_Present (Library_Unit (Item)) then
3433 while Present (Child_Parent)
3434 and then not Private_Present (Child_Parent)
3436 Child_Parent := Parent_Spec (Unit (Child_Parent));
3439 if No (Child_Parent) then
3444 Child_Parent := Parent_Spec (Unit (Child_Parent));
3446 -- Traverse all the ancestors of the current compilation
3447 -- unit to check if it is a descendant of named library unit.
3449 Curr_Parent := Parent (Item);
3450 Curr_Private := Private_Present (Curr_Parent);
3452 while Present (Parent_Spec (Unit (Curr_Parent)))
3453 and then Curr_Parent /= Child_Parent
3455 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3456 Curr_Private := Curr_Private or else Private_Present (Curr_Parent);
3459 if Curr_Parent /= Child_Parent then
3461 ("unit in with clause is private child unit!", Item);
3463 ("\current unit must also have parent&!",
3464 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3466 elsif Private_Present (Parent (Item))
3467 or else Curr_Private
3468 or else Private_Present (Item)
3469 or else Nkind_In (Unit (Parent (Item)), N_Package_Body,
3473 -- Current unit is private, of descendant of a private unit
3479 ("current unit must also be private descendant of&",
3480 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3482 end Check_Private_Limited_Withed_Unit;
3484 --------------------------------
3485 -- Expand_Limited_With_Clause --
3486 --------------------------------
3488 procedure Expand_Limited_With_Clause
3489 (Comp_Unit : Node_Id;
3493 Loc : constant Source_Ptr := Sloc (Nam);
3494 Unum : Unit_Number_Type;
3497 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3498 -- Returns true if the context already includes a with_clause for
3499 -- this unit. If the with_clause is non-limited, the unit is fully
3500 -- visible and an implicit limited_with should not be created. If
3501 -- there is already a limited_with clause for W, a second one is
3502 -- simply redundant.
3504 --------------------------
3505 -- Previous_Withed_Unit --
3506 --------------------------
3508 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3512 -- A limited with_clause cannot appear in the same context_clause
3513 -- as a nonlimited with_clause which mentions the same library.
3515 Item := First (Context_Items (Comp_Unit));
3516 while Present (Item) loop
3517 if Nkind (Item) = N_With_Clause
3518 and then Library_Unit (Item) = Library_Unit (W)
3527 end Previous_Withed_Unit;
3529 -- Start of processing for Expand_Limited_With_Clause
3532 New_Nodes_OK := New_Nodes_OK + 1;
3534 if Nkind (Nam) = N_Identifier then
3536 -- Create node for name of withed unit
3539 Make_With_Clause (Loc,
3540 Name => New_Copy (Nam));
3542 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3544 Make_With_Clause (Loc,
3545 Name => Make_Selected_Component (Loc,
3546 Prefix => New_Copy_Tree (Prefix (Nam)),
3547 Selector_Name => New_Copy (Selector_Name (Nam))));
3548 Set_Parent (Withn, Parent (N));
3551 Set_Limited_Present (Withn);
3552 Set_First_Name (Withn);
3553 Set_Implicit_With (Withn);
3557 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3562 -- Do not generate a limited_with_clause on the current unit.
3563 -- This path is taken when a unit has a limited_with clause on
3564 -- one of its child units.
3566 if Unum = Current_Sem_Unit then
3570 Set_Library_Unit (Withn, Cunit (Unum));
3571 Set_Corresponding_Spec
3572 (Withn, Specification (Unit (Cunit (Unum))));
3574 if not Previous_Withed_Unit (Withn) then
3575 Prepend (Withn, Context_Items (Parent (N)));
3576 Mark_Rewrite_Insertion (Withn);
3578 -- Add implicit limited_with_clauses for parents of child units
3579 -- mentioned in limited_with clauses.
3581 if Nkind (Nam) = N_Selected_Component then
3582 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3587 if not Limited_View_Installed (Withn) then
3588 Install_Limited_Withed_Unit (Withn);
3592 New_Nodes_OK := New_Nodes_OK - 1;
3593 end Expand_Limited_With_Clause;
3595 -- Start of processing for Install_Limited_Context_Clauses
3598 Item := First (Context_Items (N));
3599 while Present (Item) loop
3600 if Nkind (Item) = N_With_Clause
3601 and then Limited_Present (Item)
3603 if Nkind (Name (Item)) = N_Selected_Component then
3604 Expand_Limited_With_Clause
3605 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3608 Check_Private_Limited_Withed_Unit (Item);
3610 if not Implicit_With (Item)
3611 and then Is_Child_Spec (Unit (N))
3613 Check_Renamings (Parent_Spec (Unit (N)), Item);
3616 -- A unit may have a limited with on itself if it has a limited
3617 -- with_clause on one of its child units. In that case it is
3618 -- already being compiled and it makes no sense to install its
3621 -- If the item is a limited_private_with_clause, install it if the
3622 -- current unit is a body or if it is a private child. Otherwise
3623 -- the private clause is installed before analyzing the private
3624 -- part of the current unit.
3626 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3627 and then not Limited_View_Installed (Item)
3629 if not Private_Present (Item)
3630 or else Private_Present (N)
3631 or else Nkind_In (Unit (N), N_Package_Body,
3635 Install_Limited_Withed_Unit (Item);
3643 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3644 -- spec, looking for incomplete subtype declarations of incomplete
3645 -- types visible through a limited with clause.
3647 if Ada_Version >= Ada_05
3648 and then Analyzed (N)
3649 and then Nkind (Unit (N)) = N_Package_Declaration
3654 Non_Lim_View : Entity_Id;
3657 Decl := First (Visible_Declarations (Specification (Unit (N))));
3658 while Present (Decl) loop
3659 if Nkind (Decl) = N_Subtype_Declaration
3661 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3663 From_With_Type (Defining_Identifier (Decl))
3665 Def_Id := Defining_Identifier (Decl);
3666 Non_Lim_View := Non_Limited_View (Def_Id);
3668 if not Is_Incomplete_Type (Non_Lim_View) then
3670 -- Convert an incomplete subtype declaration into a
3671 -- corresponding non-limited view subtype declaration.
3672 -- This is usually the case when analyzing a body that
3673 -- has regular with-clauses, when the spec has limited
3676 -- If the non-limited view is still incomplete, it is
3677 -- the dummy entry already created, and the declaration
3678 -- cannot be reanalyzed. This is the case when installing
3679 -- a parent unit that has limited with-clauses.
3681 Set_Subtype_Indication (Decl,
3682 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3683 Set_Etype (Def_Id, Non_Lim_View);
3684 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3685 Set_Analyzed (Decl, False);
3687 -- Reanalyze the declaration, suppressing the call to
3688 -- Enter_Name to avoid duplicate names.
3690 Analyze_Subtype_Declaration
3700 end Install_Limited_Context_Clauses;
3702 ---------------------
3703 -- Install_Parents --
3704 ---------------------
3706 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3713 P := Unit (Parent_Spec (Lib_Unit));
3714 P_Name := Get_Parent_Entity (P);
3716 if Etype (P_Name) = Any_Type then
3720 if Ekind (P_Name) = E_Generic_Package
3721 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3722 N_Generic_Package_Declaration)
3723 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3726 ("child of a generic package must be a generic unit", Lib_Unit);
3728 elsif not Is_Package_Or_Generic_Package (P_Name) then
3730 ("parent unit must be package or generic package", Lib_Unit);
3731 raise Unrecoverable_Error;
3733 elsif Present (Renamed_Object (P_Name)) then
3734 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3735 raise Unrecoverable_Error;
3737 -- Verify that a child of an instance is itself an instance, or the
3738 -- renaming of one. Given that an instance that is a unit is replaced
3739 -- with a package declaration, check against the original node. The
3740 -- parent may be currently being instantiated, in which case it appears
3741 -- as a declaration, but the generic_parent is already established
3742 -- indicating that we deal with an instance.
3744 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3745 if Nkind (Lib_Unit) in N_Renaming_Declaration
3746 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3748 (Nkind (Lib_Unit) = N_Package_Declaration
3749 and then Present (Generic_Parent (Specification (Lib_Unit))))
3754 ("child of an instance must be an instance or renaming",
3759 -- This is the recursive call that ensures all parents are loaded
3761 if Is_Child_Spec (P) then
3763 Is_Private or else Private_Present (Parent (Lib_Unit)));
3766 -- Now we can install the context for this parent
3768 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3769 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3770 Install_Siblings (P_Name, Parent (Lib_Unit));
3772 -- The child unit is in the declarative region of the parent. The parent
3773 -- must therefore appear in the scope stack and be visible, as when
3774 -- compiling the corresponding body. If the child unit is private or it
3775 -- is a package body, private declarations must be accessible as well.
3776 -- Use declarations in the parent must also be installed. Finally, other
3777 -- child units of the same parent that are in the context are
3778 -- immediately visible.
3780 -- Find entity for compilation unit, and set its private descendant
3781 -- status as needed.
3783 E_Name := Defining_Entity (Lib_Unit);
3785 Set_Is_Child_Unit (E_Name);
3787 Set_Is_Private_Descendant (E_Name,
3788 Is_Private_Descendant (P_Name)
3789 or else Private_Present (Parent (Lib_Unit)));
3791 P_Spec := Specification (Unit_Declaration_Node (P_Name));
3792 Push_Scope (P_Name);
3794 -- Save current visibility of unit
3796 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
3797 Is_Immediately_Visible (P_Name);
3798 Set_Is_Immediately_Visible (P_Name);
3799 Install_Visible_Declarations (P_Name);
3800 Set_Use (Visible_Declarations (P_Spec));
3802 -- If the parent is a generic unit, its formal part may contain formal
3803 -- packages and use clauses for them.
3805 if Ekind (P_Name) = E_Generic_Package then
3806 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
3810 or else Private_Present (Parent (Lib_Unit))
3812 Install_Private_Declarations (P_Name);
3813 Install_Private_With_Clauses (P_Name);
3814 Set_Use (Private_Declarations (P_Spec));
3816 end Install_Parents;
3818 ----------------------------------
3819 -- Install_Private_With_Clauses --
3820 ----------------------------------
3822 procedure Install_Private_With_Clauses (P : Entity_Id) is
3823 Decl : constant Node_Id := Unit_Declaration_Node (P);
3827 if Debug_Flag_I then
3828 Write_Str ("install private with clauses of ");
3829 Write_Name (Chars (P));
3833 if Nkind (Parent (Decl)) = N_Compilation_Unit then
3834 Item := First (Context_Items (Parent (Decl)));
3835 while Present (Item) loop
3836 if Nkind (Item) = N_With_Clause
3837 and then Private_Present (Item)
3839 if Limited_Present (Item) then
3840 if not Limited_View_Installed (Item) then
3841 Install_Limited_Withed_Unit (Item);
3844 Install_Withed_Unit (Item, Private_With_OK => True);
3851 end Install_Private_With_Clauses;
3853 ----------------------
3854 -- Install_Siblings --
3855 ----------------------
3857 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
3863 -- Iterate over explicit with clauses, and check whether the scope of
3864 -- each entity is an ancestor of the current unit, in which case it is
3865 -- immediately visible.
3867 Item := First (Context_Items (N));
3868 while Present (Item) loop
3870 -- Do not install private_with_clauses declaration, unless
3871 -- unit is itself a private child unit, or is a body.
3872 -- Note that for a subprogram body the private_with_clause does
3873 -- not take effect until after the specification.
3875 if Nkind (Item) /= N_With_Clause
3876 or else Implicit_With (Item)
3877 or else Limited_Present (Item)
3881 elsif not Private_Present (Item)
3882 or else Private_Present (N)
3883 or else Nkind (Unit (N)) = N_Package_Body
3885 Id := Entity (Name (Item));
3887 if Is_Child_Unit (Id)
3888 and then Is_Ancestor_Package (Scope (Id), U_Name)
3890 Set_Is_Immediately_Visible (Id);
3892 -- Check for the presence of another unit in the context,
3893 -- that may be inadvertently hidden by the child.
3895 Prev := Current_Entity (Id);
3898 and then Is_Immediately_Visible (Prev)
3899 and then not Is_Child_Unit (Prev)
3905 Clause := First (Context_Items (N));
3906 while Present (Clause) loop
3907 if Nkind (Clause) = N_With_Clause
3908 and then Entity (Name (Clause)) = Prev
3911 ("child unit& hides compilation unit " &
3912 "with the same name?",
3922 -- The With_Clause may be on a grand-child or one of its further
3923 -- descendants, which makes a child immediately visible. Examine
3924 -- ancestry to determine whether such a child exists. For example,
3925 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
3926 -- is immediately visible.
3928 elsif Is_Child_Unit (Id) then
3934 while Is_Child_Unit (Par) loop
3935 if Is_Ancestor_Package (Scope (Par), U_Name) then
3936 Set_Is_Immediately_Visible (Par);
3945 -- If the item is a private with-clause on a child unit, the parent
3946 -- may have been installed already, but the child unit must remain
3947 -- invisible until installed in a private part or body.
3949 elsif Private_Present (Item) then
3950 Id := Entity (Name (Item));
3952 if Is_Child_Unit (Id) then
3953 Set_Is_Visible_Child_Unit (Id, False);
3959 end Install_Siblings;
3961 ---------------------------------
3962 -- Install_Limited_Withed_Unit --
3963 ---------------------------------
3965 procedure Install_Limited_Withed_Unit (N : Node_Id) is
3966 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
3969 Is_Child_Package : Boolean := False;
3970 Lim_Header : Entity_Id;
3971 Lim_Typ : Entity_Id;
3973 procedure Check_Body_Required;
3974 -- A unit mentioned in a limited with_clause may not be mentioned in
3975 -- a regular with_clause, but must still be included in the current
3976 -- partition. We need to determine whether the unit needs a body, so
3977 -- that the binder can determine the name of the file to be compiled.
3978 -- Checking whether a unit needs a body can be done without semantic
3979 -- analysis, by examining the nature of the declarations in the package.
3981 function Has_Limited_With_Clause
3982 (C_Unit : Entity_Id;
3983 Pack : Entity_Id) return Boolean;
3984 -- Determine whether any package in the ancestor chain starting with
3985 -- C_Unit has a limited with clause for package Pack.
3987 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
3988 -- Check if some package installed though normal with-clauses has a
3989 -- renaming declaration of package P. AARM 10.1.2(21/2).
3991 -------------------------
3992 -- Check_Body_Required --
3993 -------------------------
3995 procedure Check_Body_Required is
3996 PA : constant List_Id :=
3997 Pragmas_After (Aux_Decls_Node (Parent (P_Unit)));
3999 procedure Check_Declarations (Spec : Node_Id);
4000 -- Recursive procedure that does the work and checks nested packages
4002 ------------------------
4003 -- Check_Declarations --
4004 ------------------------
4006 procedure Check_Declarations (Spec : Node_Id) is
4008 Incomplete_Decls : constant Elist_Id := New_Elmt_List;
4010 Subp_List : constant Elist_Id := New_Elmt_List;
4012 procedure Check_Pragma_Import (P : Node_Id);
4013 -- If a pragma import applies to a previous subprogram, the
4014 -- enclosing unit may not need a body. The processing is syntactic
4015 -- and does not require a declaration to be analyzed. The code
4016 -- below also handles pragma Import when applied to a subprogram
4017 -- that renames another. In this case the pragma applies to the
4020 -- Chains of multiple renames are not handled by the code below.
4021 -- It is probably impossible to handle all cases without proper
4022 -- name resolution. In such cases the algorithm is conservative
4023 -- and will indicate that a body is needed???
4025 -------------------------
4026 -- Check_Pragma_Import --
4027 -------------------------
4029 procedure Check_Pragma_Import (P : Node_Id) is
4035 procedure Remove_Homonyms (E : Node_Id);
4036 -- Make one pass over list of subprograms. Called again if
4037 -- subprogram is a renaming. E is known to be an identifier.
4039 ---------------------
4040 -- Remove_Homonyms --
4041 ---------------------
4043 procedure Remove_Homonyms (E : Node_Id) is
4044 R : Entity_Id := Empty;
4045 -- Name of renamed entity, if any
4048 Subp_Id := First_Elmt (Subp_List);
4049 while Present (Subp_Id) loop
4050 if Chars (Node (Subp_Id)) = Chars (E) then
4051 if Nkind (Parent (Parent (Node (Subp_Id))))
4052 /= N_Subprogram_Renaming_Declaration
4055 Next_Elmt (Subp_Id);
4056 Remove_Elmt (Subp_List, Prev_Id);
4058 R := Name (Parent (Parent (Node (Subp_Id))));
4062 Next_Elmt (Subp_Id);
4067 if Nkind (R) = N_Identifier then
4068 Remove_Homonyms (R);
4070 elsif Nkind (R) = N_Selected_Component then
4071 Remove_Homonyms (Selector_Name (R));
4073 -- Renaming of attribute
4079 end Remove_Homonyms;
4081 -- Start of processing for Check_Pragma_Import
4084 -- Find name of entity in Import pragma. We have not analyzed
4085 -- the construct, so we must guard against syntax errors.
4087 Arg := Next (First (Pragma_Argument_Associations (P)));
4090 or else Nkind (Expression (Arg)) /= N_Identifier
4094 Imported := Expression (Arg);
4097 Remove_Homonyms (Imported);
4098 end Check_Pragma_Import;
4100 -- Start of processing for Check_Declarations
4103 -- Search for Elaborate Body pragma
4105 Decl := First (Visible_Declarations (Spec));
4106 while Present (Decl)
4107 and then Nkind (Decl) = N_Pragma
4109 if Get_Pragma_Id (Decl) = Pragma_Elaborate_Body then
4110 Set_Body_Required (Library_Unit (N));
4117 -- Look for declarations that require the presence of a body
4119 while Present (Decl) loop
4121 -- Subprogram that comes from source means body may be needed.
4122 -- Save for subsequent examination of import pragmas.
4124 if Comes_From_Source (Decl)
4125 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4126 N_Subprogram_Renaming_Declaration,
4127 N_Generic_Subprogram_Declaration))
4129 Append_Elmt (Defining_Entity (Decl), Subp_List);
4131 -- Package declaration of generic package declaration. We need
4132 -- to recursively examine nested declarations.
4134 elsif Nkind_In (Decl, N_Package_Declaration,
4135 N_Generic_Package_Declaration)
4137 Check_Declarations (Specification (Decl));
4139 elsif Nkind (Decl) = N_Pragma
4140 and then Pragma_Name (Decl) = Name_Import
4142 Check_Pragma_Import (Decl);
4148 -- Same set of tests for private part. In addition to subprograms
4149 -- detect the presence of Taft Amendment types (incomplete types
4150 -- completed in the body).
4152 Decl := First (Private_Declarations (Spec));
4153 while Present (Decl) loop
4154 if Comes_From_Source (Decl)
4155 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4156 N_Subprogram_Renaming_Declaration,
4157 N_Generic_Subprogram_Declaration))
4159 Append_Elmt (Defining_Entity (Decl), Subp_List);
4161 elsif Nkind_In (Decl, N_Package_Declaration,
4162 N_Generic_Package_Declaration)
4164 Check_Declarations (Specification (Decl));
4166 -- Collect incomplete type declarations for separate pass
4168 elsif Nkind (Decl) = N_Incomplete_Type_Declaration then
4169 Append_Elmt (Decl, Incomplete_Decls);
4171 elsif Nkind (Decl) = N_Pragma
4172 and then Pragma_Name (Decl) = Name_Import
4174 Check_Pragma_Import (Decl);
4180 -- Now check incomplete declarations to locate Taft amendment
4181 -- types. This can be done by examining the defining identifiers
4182 -- of type declarations without real semantic analysis.
4188 Inc := First_Elmt (Incomplete_Decls);
4189 while Present (Inc) loop
4190 Decl := Next (Node (Inc));
4191 while Present (Decl) loop
4192 if Nkind (Decl) = N_Full_Type_Declaration
4193 and then Chars (Defining_Identifier (Decl)) =
4194 Chars (Defining_Identifier (Node (Inc)))
4202 -- If no completion, this is a TAT, and a body is needed
4205 Set_Body_Required (Library_Unit (N));
4213 -- Finally, check whether there are subprograms that still
4214 -- require a body, i.e. are not renamings or null.
4216 if not Is_Empty_Elmt_List (Subp_List) then
4222 Subp_Id := First_Elmt (Subp_List);
4223 Spec := Parent (Node (Subp_Id));
4225 while Present (Subp_Id) loop
4226 if Nkind (Parent (Spec))
4227 = N_Subprogram_Renaming_Declaration
4231 elsif Nkind (Spec) = N_Procedure_Specification
4232 and then Null_Present (Spec)
4237 Set_Body_Required (Library_Unit (N));
4241 Next_Elmt (Subp_Id);
4245 end Check_Declarations;
4247 -- Start of processing for Check_Body_Required
4250 -- If this is an imported package (Java and CIL usage) no body is
4251 -- needed. Scan list of pragmas that may follow a compilation unit
4252 -- to look for a relevant pragma Import.
4254 if Present (PA) then
4260 while Present (Prag) loop
4261 if Nkind (Prag) = N_Pragma
4262 and then Get_Pragma_Id (Prag) = Pragma_Import
4272 Check_Declarations (Specification (P_Unit));
4273 end Check_Body_Required;
4275 -----------------------------
4276 -- Has_Limited_With_Clause --
4277 -----------------------------
4279 function Has_Limited_With_Clause
4280 (C_Unit : Entity_Id;
4281 Pack : Entity_Id) return Boolean
4288 while Present (Par) loop
4289 if Ekind (Par) /= E_Package then
4293 -- Retrieve the Compilation_Unit node for Par and determine if
4294 -- its context clauses contain a limited with for Pack.
4296 Par_Unit := Parent (Parent (Parent (Par)));
4298 if Nkind (Par_Unit) = N_Package_Declaration then
4299 Par_Unit := Parent (Par_Unit);
4302 if Has_With_Clause (Par_Unit, Pack, True) then
4306 -- If there are more ancestors, climb up the tree, otherwise
4309 if Is_Child_Unit (Par) then
4317 end Has_Limited_With_Clause;
4319 ----------------------------------
4320 -- Is_Visible_Through_Renamings --
4321 ----------------------------------
4323 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4324 Kind : constant Node_Kind :=
4325 Nkind (Unit (Cunit (Current_Sem_Unit)));
4331 -- Example of the error detected by this subprogram:
4339 -- package Ren_P renames P;
4345 -- limited with P; -- ERROR
4346 -- package R.C is ...
4348 Aux_Unit := Cunit (Current_Sem_Unit);
4351 Item := First (Context_Items (Aux_Unit));
4352 while Present (Item) loop
4353 if Nkind (Item) = N_With_Clause
4354 and then not Limited_Present (Item)
4355 and then Nkind (Unit (Library_Unit (Item))) =
4356 N_Package_Declaration
4359 First (Visible_Declarations
4360 (Specification (Unit (Library_Unit (Item)))));
4361 while Present (Decl) loop
4362 if Nkind (Decl) = N_Package_Renaming_Declaration
4363 and then Entity (Name (Decl)) = P
4365 -- Generate the error message only if the current unit
4366 -- is a package declaration; in case of subprogram
4367 -- bodies and package bodies we just return True to
4368 -- indicate that the limited view must not be
4371 if Kind = N_Package_Declaration then
4373 ("simultaneous visibility of the limited and " &
4374 "unlimited views not allowed", N);
4375 Error_Msg_Sloc := Sloc (Item);
4377 ("\\ unlimited view of & visible through the " &
4378 "context clause #", N, P);
4379 Error_Msg_Sloc := Sloc (Decl);
4380 Error_Msg_NE ("\\ and the renaming #", N, P);
4393 -- If it's a body not acting as spec, follow pointer to
4394 -- corresponding spec, otherwise follow pointer to parent spec.
4396 if Present (Library_Unit (Aux_Unit))
4397 and then Nkind_In (Unit (Aux_Unit),
4398 N_Package_Body, N_Subprogram_Body)
4400 if Aux_Unit = Library_Unit (Aux_Unit) then
4402 -- Aux_Unit is a body that acts as a spec. Clause has
4403 -- already been flagged as illegal.
4408 Aux_Unit := Library_Unit (Aux_Unit);
4412 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4415 exit when No (Aux_Unit);
4419 end Is_Visible_Through_Renamings;
4421 -- Start of processing for Install_Limited_Withed_Unit
4424 pragma Assert (not Limited_View_Installed (N));
4426 -- In case of limited with_clause on subprograms, generics, instances,
4427 -- or renamings, the corresponding error was previously posted and we
4428 -- have nothing to do here. If the file is missing altogether, it has
4429 -- no source location.
4431 if Nkind (P_Unit) /= N_Package_Declaration
4432 or else Sloc (P_Unit) = No_Location
4437 P := Defining_Unit_Name (Specification (P_Unit));
4439 -- Handle child packages
4441 if Nkind (P) = N_Defining_Program_Unit_Name then
4442 Is_Child_Package := True;
4443 P := Defining_Identifier (P);
4446 -- Do not install the limited-view if the context of the unit is already
4447 -- available through a regular with clause.
4449 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4450 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4455 -- Do not install the limited-view if the full-view is already visible
4456 -- through renaming declarations.
4458 if Is_Visible_Through_Renamings (P) then
4462 -- Do not install the limited view if this is the unit being analyzed.
4463 -- This unusual case will happen when a unit has a limited_with clause
4464 -- on one of its children. The compilation of the child forces the
4465 -- load of the parent which tries to install the limited view of the
4466 -- child again. Installing the limited view must also be disabled
4467 -- when compiling the body of the child unit.
4469 if P = Cunit_Entity (Current_Sem_Unit)
4471 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4472 and then P = Main_Unit_Entity)
4477 -- This scenario is similar to the one above, the difference is that
4478 -- the compilation of sibling Par.Sib forces the load of parent Par
4479 -- which tries to install the limited view of Lim_Pack [1]. However
4480 -- Par.Sib has a with clause for Lim_Pack [2] in its body, and thus
4481 -- needs the non-limited views of all entities from Lim_Pack.
4483 -- limited with Lim_Pack; -- [1]
4484 -- package Par is ... package Lim_Pack is ...
4486 -- with Lim_Pack; -- [2]
4487 -- package Par.Sib is ... package body Par.Sib is ...
4489 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4490 -- Sem_Unit is the body of Par.Sib.
4492 if Ekind (P) = E_Package
4493 and then Ekind (Main_Unit_Entity) = E_Package
4494 and then Is_Child_Unit (Main_Unit_Entity)
4496 -- The body has a regular with clause
4498 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4499 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4501 -- One of the ancestors has a limited with clause
4503 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4504 N_Package_Specification
4505 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4510 -- A common use of the limited-with is to have a limited-with
4511 -- in the package spec, and a normal with in its package body.
4514 -- limited with X; -- [1]
4518 -- package body A is ...
4520 -- The compilation of A's body installs the context clauses found at [2]
4521 -- and then the context clauses of its specification (found at [1]). As
4522 -- a consequence, at [1] the specification of X has been analyzed and it
4523 -- is immediately visible. According to the semantics of limited-with
4524 -- context clauses we don't install the limited view because the full
4525 -- view of X supersedes its limited view.
4527 if Analyzed (P_Unit)
4529 (Is_Immediately_Visible (P)
4531 (Is_Child_Package and then Is_Visible_Child_Unit (P)))
4536 if Debug_Flag_I then
4537 Write_Str ("install limited view of ");
4538 Write_Name (Chars (P));
4542 -- If the unit has not been analyzed and the limited view has not been
4543 -- already installed then we install it.
4545 if not Analyzed (P_Unit) then
4546 if not In_Chain (P) then
4548 -- Minimum decoration
4550 Set_Ekind (P, E_Package);
4551 Set_Etype (P, Standard_Void_Type);
4552 Set_Scope (P, Standard_Standard);
4554 if Is_Child_Package then
4555 Set_Is_Child_Unit (P);
4556 Set_Is_Visible_Child_Unit (P);
4557 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4560 -- Place entity on visibility structure
4562 Set_Homonym (P, Current_Entity (P));
4563 Set_Current_Entity (P);
4565 if Debug_Flag_I then
4566 Write_Str (" (homonym) chain ");
4567 Write_Name (Chars (P));
4571 -- Install the incomplete view. The first element of the limited
4572 -- view is a header (an E_Package entity) used to reference the
4573 -- first shadow entity in the private part of the package.
4575 Lim_Header := Limited_View (P);
4576 Lim_Typ := First_Entity (Lim_Header);
4578 while Present (Lim_Typ)
4579 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4581 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4582 Set_Current_Entity (Lim_Typ);
4584 if Debug_Flag_I then
4585 Write_Str (" (homonym) chain ");
4586 Write_Name (Chars (Lim_Typ));
4590 Next_Entity (Lim_Typ);
4594 -- If the unit appears in a previous regular with_clause, the regular
4595 -- entities of the public part of the withed package must be replaced
4596 -- by the shadow ones.
4598 -- This code must be kept synchronized with the code that replaces the
4599 -- shadow entities by the real entities (see body of Remove_Limited
4600 -- With_Clause); otherwise the contents of the homonym chains are not
4604 -- Hide all the type entities of the public part of the package to
4605 -- avoid its usage. This is needed to cover all the subtype decla-
4606 -- rations because we do not remove them from the homonym chain.
4608 E := First_Entity (P);
4609 while Present (E) and then E /= First_Private_Entity (P) loop
4611 Set_Was_Hidden (E, Is_Hidden (E));
4618 -- Replace the real entities by the shadow entities of the limited
4619 -- view. The first element of the limited view is a header that is
4620 -- used to reference the first shadow entity in the private part
4621 -- of the package. Successive elements are the limited views of the
4622 -- type (including regular incomplete types) declared in the package.
4624 Lim_Header := Limited_View (P);
4626 Lim_Typ := First_Entity (Lim_Header);
4627 while Present (Lim_Typ)
4628 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4630 pragma Assert (not In_Chain (Lim_Typ));
4632 -- Do not unchain nested packages and child units
4634 if Ekind (Lim_Typ) /= E_Package
4635 and then not Is_Child_Unit (Lim_Typ)
4641 Prev := Current_Entity (Lim_Typ);
4644 -- Replace E in the homonyms list, so that the limited
4645 -- view becomes available.
4647 if E = Non_Limited_View (Lim_Typ) then
4648 Set_Homonym (Lim_Typ, Homonym (Prev));
4649 Set_Current_Entity (Lim_Typ);
4653 E := Homonym (Prev);
4655 -- E may have been removed when installing a
4656 -- previous limited_with_clause.
4660 exit when E = Non_Limited_View (Lim_Typ);
4662 Prev := Homonym (Prev);
4666 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4667 Set_Homonym (Prev, Lim_Typ);
4672 if Debug_Flag_I then
4673 Write_Str (" (homonym) chain ");
4674 Write_Name (Chars (Lim_Typ));
4679 Next_Entity (Lim_Typ);
4683 -- The package must be visible while the limited-with clause is active
4684 -- because references to the type P.T must resolve in the usual way.
4685 -- In addition, we remember that the limited-view has been installed to
4686 -- uninstall it at the point of context removal.
4688 Set_Is_Immediately_Visible (P);
4689 Set_Limited_View_Installed (N);
4691 -- If unit has not been analyzed in some previous context, check
4692 -- (imperfectly ???) whether it might need a body.
4694 if not Analyzed (P_Unit) then
4695 Check_Body_Required;
4698 -- If the package in the limited_with clause is a child unit, the
4699 -- clause is unanalyzed and appears as a selected component. Recast
4700 -- it as an expanded name so that the entity can be properly set. Use
4701 -- entity of parent, if available, for higher ancestors in the name.
4703 if Nkind (Name (N)) = N_Selected_Component then
4711 while Nkind (Nam) = N_Selected_Component
4712 and then Present (Ent)
4714 Change_Selected_Component_To_Expanded_Name (Nam);
4716 -- Set entity of parent identifiers if the unit is a child
4717 -- unit. This ensures that the tree is properly formed from
4718 -- semantic point of view (e.g. for ASIS queries).
4720 Set_Entity (Nam, Ent);
4722 Nam := Prefix (Nam);
4725 -- Set entity of last ancestor
4727 if Nkind (Nam) = N_Identifier then
4728 Set_Entity (Nam, Ent);
4734 Set_Entity (Name (N), P);
4735 Set_From_With_Type (P);
4736 end Install_Limited_Withed_Unit;
4738 -------------------------
4739 -- Install_Withed_Unit --
4740 -------------------------
4742 procedure Install_Withed_Unit
4743 (With_Clause : Node_Id;
4744 Private_With_OK : Boolean := False)
4746 Uname : constant Entity_Id := Entity (Name (With_Clause));
4747 P : constant Entity_Id := Scope (Uname);
4750 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4751 -- compiling a package declaration and the Private_With_OK flag was not
4752 -- set by the caller. These declarations will be installed later (before
4753 -- analyzing the private part of the package).
4755 if Private_Present (With_Clause)
4756 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
4757 and then not (Private_With_OK)
4762 if Debug_Flag_I then
4763 if Private_Present (With_Clause) then
4764 Write_Str ("install private withed unit ");
4766 Write_Str ("install withed unit ");
4769 Write_Name (Chars (Uname));
4773 -- We do not apply the restrictions to an internal unit unless
4774 -- we are compiling the internal unit as a main unit. This check
4775 -- is also skipped for dummy units (for missing packages).
4777 if Sloc (Uname) /= No_Location
4778 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
4779 or else Current_Sem_Unit = Main_Unit)
4781 Check_Restricted_Unit
4782 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
4785 if P /= Standard_Standard then
4787 -- If the unit is not analyzed after analysis of the with clause and
4788 -- it is an instantiation then it awaits a body and is the main unit.
4789 -- Its appearance in the context of some other unit indicates a
4790 -- circular dependency (DEC suite perversity).
4792 if not Analyzed (Uname)
4793 and then Nkind (Parent (Uname)) = N_Package_Instantiation
4796 ("instantiation depends on itself", Name (With_Clause));
4798 elsif not Is_Visible_Child_Unit (Uname) then
4799 Set_Is_Visible_Child_Unit (Uname);
4801 -- If the child unit appears in the context of its parent, it is
4802 -- immediately visible.
4804 if In_Open_Scopes (Scope (Uname)) then
4805 Set_Is_Immediately_Visible (Uname);
4808 if Is_Generic_Instance (Uname)
4809 and then Ekind (Uname) in Subprogram_Kind
4811 -- Set flag as well on the visible entity that denotes the
4812 -- instance, which renames the current one.
4814 Set_Is_Visible_Child_Unit
4816 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
4819 -- The parent unit may have been installed already, and may have
4820 -- appeared in a use clause.
4822 if In_Use (Scope (Uname)) then
4823 Set_Is_Potentially_Use_Visible (Uname);
4826 Set_Context_Installed (With_Clause);
4829 elsif not Is_Immediately_Visible (Uname) then
4830 if not Private_Present (With_Clause)
4831 or else Private_With_OK
4833 Set_Is_Immediately_Visible (Uname);
4836 Set_Context_Installed (With_Clause);
4839 -- A with-clause overrides a with-type clause: there are no restric-
4840 -- tions on the use of package entities.
4842 if Ekind (Uname) = E_Package then
4843 Set_From_With_Type (Uname, False);
4846 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4847 -- unit if there is a visible homograph for it declared in the same
4848 -- declarative region. This pathological case can only arise when an
4849 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4850 -- G1 has a generic child also named G2, and the context includes with_
4851 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4852 -- of I1.G2 visible as well. If the child unit is named Standard, do
4853 -- not apply the check to the Standard package itself.
4855 if Is_Child_Unit (Uname)
4856 and then Is_Visible_Child_Unit (Uname)
4857 and then Ada_Version >= Ada_05
4860 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
4866 U2 := Homonym (Uname);
4868 and then U2 /= Standard_Standard
4871 Decl2 := Unit_Declaration_Node (P2);
4873 if Is_Child_Unit (U2)
4874 and then Is_Visible_Child_Unit (U2)
4876 if Is_Generic_Instance (P)
4877 and then Nkind (Decl1) = N_Package_Declaration
4878 and then Generic_Parent (Specification (Decl1)) = P2
4880 Error_Msg_N ("illegal with_clause", With_Clause);
4882 ("\child unit has visible homograph" &
4883 " (RM 8.3(26), 10.1.1(19))",
4887 elsif Is_Generic_Instance (P2)
4888 and then Nkind (Decl2) = N_Package_Declaration
4889 and then Generic_Parent (Specification (Decl2)) = P
4891 -- With_clause for child unit of instance appears before
4892 -- in the context. We want to place the error message on
4893 -- it, not on the generic child unit itself.
4896 Prev_Clause : Node_Id;
4899 Prev_Clause := First (List_Containing (With_Clause));
4900 while Entity (Name (Prev_Clause)) /= U2 loop
4904 pragma Assert (Present (Prev_Clause));
4905 Error_Msg_N ("illegal with_clause", Prev_Clause);
4907 ("\child unit has visible homograph" &
4908 " (RM 8.3(26), 10.1.1(19))",
4919 end Install_Withed_Unit;
4925 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
4926 K : constant Node_Kind := Nkind (Lib_Unit);
4929 return (K in N_Generic_Declaration or else
4930 K in N_Generic_Instantiation or else
4931 K in N_Generic_Renaming_Declaration or else
4932 K = N_Package_Declaration or else
4933 K = N_Package_Renaming_Declaration or else
4934 K = N_Subprogram_Declaration or else
4935 K = N_Subprogram_Renaming_Declaration)
4936 and then Present (Parent_Spec (Lib_Unit));
4939 ------------------------------------
4940 -- Is_Legal_Shadow_Entity_In_Body --
4941 ------------------------------------
4943 function Is_Legal_Shadow_Entity_In_Body (T : Entity_Id) return Boolean is
4944 C_Unit : constant Node_Id := Cunit (Current_Sem_Unit);
4946 return Nkind (Unit (C_Unit)) = N_Package_Body
4947 and then Has_With_Clause (C_Unit,
4948 Cunit_Entity (Get_Source_Unit (Non_Limited_View (T))));
4949 end Is_Legal_Shadow_Entity_In_Body;
4951 -----------------------
4952 -- Load_Needed_Body --
4953 -----------------------
4955 -- N is a generic unit named in a with clause, or else it is a unit that
4956 -- contains a generic unit or an inlined function. In order to perform an
4957 -- instantiation, the body of the unit must be present. If the unit itself
4958 -- is generic, we assume that an instantiation follows, and load & analyze
4959 -- the body unconditionally. This forces analysis of the spec as well.
4961 -- If the unit is not generic, but contains a generic unit, it is loaded on
4962 -- demand, at the point of instantiation (see ch12).
4964 procedure Load_Needed_Body (N : Node_Id; OK : out Boolean) is
4965 Body_Name : Unit_Name_Type;
4966 Unum : Unit_Number_Type;
4968 Save_Style_Check : constant Boolean := Opt.Style_Check;
4969 -- The loading and analysis is done with style checks off
4972 if not GNAT_Mode then
4973 Style_Check := False;
4976 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
4979 (Load_Name => Body_Name,
4985 if Unum = No_Unit then
4989 Compiler_State := Analyzing; -- reset after load
4991 if not Fatal_Error (Unum) or else Try_Semantics then
4992 if Debug_Flag_L then
4993 Write_Str ("*** Loaded generic body");
4997 Semantics (Cunit (Unum));
5003 Style_Check := Save_Style_Check;
5004 end Load_Needed_Body;
5006 -------------------------
5007 -- Build_Limited_Views --
5008 -------------------------
5010 procedure Build_Limited_Views (N : Node_Id) is
5011 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
5012 P : constant Entity_Id := Cunit_Entity (Unum);
5014 Spec : Node_Id; -- To denote a package specification
5015 Lim_Typ : Entity_Id; -- To denote shadow entities
5016 Comp_Typ : Entity_Id; -- To denote real entities
5018 Lim_Header : Entity_Id; -- Package entity
5019 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
5020 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
5022 procedure Decorate_Incomplete_Type
5025 -- Add attributes of an incomplete type to a shadow entity. The same
5026 -- attributes are placed on the real entity, so that gigi receives
5027 -- a consistent view.
5029 procedure Decorate_Package_Specification (P : Entity_Id);
5030 -- Add attributes of a package entity to the entity in a package
5033 procedure Decorate_Tagged_Type
5037 -- Set basic attributes of tagged type T, including its class_wide type.
5038 -- The parameters Loc, Scope are used to decorate the class_wide type.
5040 procedure Build_Chain
5042 First_Decl : Node_Id);
5043 -- Construct list of shadow entities and attach it to entity of
5044 -- package that is mentioned in a limited_with clause.
5046 function New_Internal_Shadow_Entity
5047 (Kind : Entity_Kind;
5048 Sloc_Value : Source_Ptr;
5049 Id_Char : Character) return Entity_Id;
5050 -- Build a new internal entity and append it to the list of shadow
5051 -- entities available through the limited-header
5053 ------------------------------
5054 -- Decorate_Incomplete_Type --
5055 ------------------------------
5057 procedure Decorate_Incomplete_Type
5062 Set_Ekind (E, E_Incomplete_Type);
5063 Set_Scope (E, Scop);
5065 Set_Is_First_Subtype (E, True);
5066 Set_Stored_Constraint (E, No_Elist);
5067 Set_Full_View (E, Empty);
5068 Init_Size_Align (E);
5069 end Decorate_Incomplete_Type;
5071 --------------------------
5072 -- Decorate_Tagged_Type --
5073 --------------------------
5075 procedure Decorate_Tagged_Type
5083 Decorate_Incomplete_Type (T, Scop);
5084 Set_Is_Tagged_Type (T);
5086 -- Build corresponding class_wide type, if not previously done
5088 -- Note: The class-wide entity is shared by the limited-view
5089 -- and the full-view.
5091 if No (Class_Wide_Type (T)) then
5092 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S'));
5094 -- Set parent to be the same as the parent of the tagged type.
5095 -- We need a parent field set, and it is supposed to point to
5096 -- the declaration of the type. The tagged type declaration
5097 -- essentially declares two separate types, the tagged type
5098 -- itself and the corresponding class-wide type, so it is
5099 -- reasonable for the parent fields to point to the declaration
5102 Set_Parent (CW, Parent (T));
5104 -- Set remaining fields of classwide type
5106 Set_Ekind (CW, E_Class_Wide_Type);
5108 Set_Scope (CW, Scop);
5109 Set_Is_Tagged_Type (CW);
5110 Set_Is_First_Subtype (CW, True);
5111 Init_Size_Align (CW);
5112 Set_Has_Unknown_Discriminants (CW, True);
5113 Set_Class_Wide_Type (CW, CW);
5114 Set_Equivalent_Type (CW, Empty);
5115 Set_From_With_Type (CW, From_With_Type (T));
5117 -- Link type to its class-wide type
5119 Set_Class_Wide_Type (T, CW);
5121 end Decorate_Tagged_Type;
5123 ------------------------------------
5124 -- Decorate_Package_Specification --
5125 ------------------------------------
5127 procedure Decorate_Package_Specification (P : Entity_Id) is
5129 -- Place only the most basic attributes
5131 Set_Ekind (P, E_Package);
5132 Set_Etype (P, Standard_Void_Type);
5133 end Decorate_Package_Specification;
5135 --------------------------------
5136 -- New_Internal_Shadow_Entity --
5137 --------------------------------
5139 function New_Internal_Shadow_Entity
5140 (Kind : Entity_Kind;
5141 Sloc_Value : Source_Ptr;
5142 Id_Char : Character) return Entity_Id
5144 E : constant Entity_Id :=
5145 Make_Defining_Identifier (Sloc_Value,
5146 Chars => New_Internal_Name (Id_Char));
5149 Set_Ekind (E, Kind);
5150 Set_Is_Internal (E, True);
5152 if Kind in Type_Kind then
5153 Init_Size_Align (E);
5156 Append_Entity (E, Lim_Header);
5159 end New_Internal_Shadow_Entity;
5165 procedure Build_Chain
5167 First_Decl : Node_Id)
5169 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
5170 Is_Tagged : Boolean;
5175 while Present (Decl) loop
5177 -- For each library_package_declaration in the environment, there
5178 -- is an implicit declaration of a *limited view* of that library
5179 -- package. The limited view of a package contains:
5181 -- * For each nested package_declaration, a declaration of the
5182 -- limited view of that package, with the same defining-
5183 -- program-unit name.
5185 -- * For each type_declaration in the visible part, an incomplete
5186 -- type-declaration with the same defining_identifier, whose
5187 -- completion is the type_declaration. If the type_declaration
5188 -- is tagged, then the incomplete_type_declaration is tagged
5191 -- The partial view is tagged if the declaration has the
5192 -- explicit keyword, or else if it is a type extension, both
5193 -- of which can be ascertained syntactically.
5195 if Nkind (Decl) = N_Full_Type_Declaration then
5197 (Nkind (Type_Definition (Decl)) = N_Record_Definition
5198 and then Tagged_Present (Type_Definition (Decl)))
5200 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
5203 (Record_Extension_Part (Type_Definition (Decl))));
5205 Comp_Typ := Defining_Identifier (Decl);
5207 if not Analyzed_Unit then
5209 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5211 Decorate_Incomplete_Type (Comp_Typ, Scope);
5215 -- Create shadow entity for type
5217 Lim_Typ := New_Internal_Shadow_Entity
5218 (Kind => Ekind (Comp_Typ),
5219 Sloc_Value => Sloc (Comp_Typ),
5222 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5223 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5224 Set_From_With_Type (Lim_Typ);
5227 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5229 Decorate_Incomplete_Type (Lim_Typ, Scope);
5232 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5234 elsif Nkind_In (Decl, N_Private_Type_Declaration,
5235 N_Incomplete_Type_Declaration,
5236 N_Task_Type_Declaration,
5237 N_Protected_Type_Declaration)
5239 Comp_Typ := Defining_Identifier (Decl);
5242 Nkind_In (Decl, N_Private_Type_Declaration,
5243 N_Incomplete_Type_Declaration)
5244 and then Tagged_Present (Decl);
5246 if not Analyzed_Unit then
5248 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5250 Decorate_Incomplete_Type (Comp_Typ, Scope);
5254 Lim_Typ := New_Internal_Shadow_Entity
5255 (Kind => Ekind (Comp_Typ),
5256 Sloc_Value => Sloc (Comp_Typ),
5259 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5260 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5261 Set_From_With_Type (Lim_Typ);
5264 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5266 Decorate_Incomplete_Type (Lim_Typ, Scope);
5269 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5271 elsif Nkind (Decl) = N_Private_Extension_Declaration then
5272 Comp_Typ := Defining_Identifier (Decl);
5274 if not Analyzed_Unit then
5275 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope);
5278 -- Create shadow entity for type
5280 Lim_Typ := New_Internal_Shadow_Entity
5281 (Kind => Ekind (Comp_Typ),
5282 Sloc_Value => Sloc (Comp_Typ),
5285 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5286 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5287 Set_From_With_Type (Lim_Typ);
5289 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5290 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5292 elsif Nkind (Decl) = N_Package_Declaration then
5297 Spec : constant Node_Id := Specification (Decl);
5300 Comp_Typ := Defining_Unit_Name (Spec);
5302 if not Analyzed (Cunit (Unum)) then
5303 Decorate_Package_Specification (Comp_Typ);
5304 Set_Scope (Comp_Typ, Scope);
5307 Lim_Typ := New_Internal_Shadow_Entity
5308 (Kind => Ekind (Comp_Typ),
5309 Sloc_Value => Sloc (Comp_Typ),
5312 Decorate_Package_Specification (Lim_Typ);
5313 Set_Scope (Lim_Typ, Scope);
5315 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5316 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5317 Set_From_With_Type (Lim_Typ);
5319 -- Note: The non_limited_view attribute is not used
5320 -- for local packages.
5324 First_Decl => First (Visible_Declarations (Spec)));
5332 -- Start of processing for Build_Limited_Views
5335 pragma Assert (Limited_Present (N));
5337 -- A library_item mentioned in a limited_with_clause is a package
5338 -- declaration, not a subprogram declaration, generic declaration,
5339 -- generic instantiation, or package renaming declaration.
5341 case Nkind (Unit (Library_Unit (N))) is
5342 when N_Package_Declaration =>
5345 when N_Subprogram_Declaration =>
5346 Error_Msg_N ("subprograms not allowed in "
5347 & "limited with_clauses", N);
5350 when N_Generic_Package_Declaration |
5351 N_Generic_Subprogram_Declaration =>
5352 Error_Msg_N ("generics not allowed in "
5353 & "limited with_clauses", N);
5356 when N_Generic_Instantiation =>
5357 Error_Msg_N ("generic instantiations not allowed in "
5358 & "limited with_clauses", N);
5361 when N_Generic_Renaming_Declaration =>
5362 Error_Msg_N ("generic renamings not allowed in "
5363 & "limited with_clauses", N);
5366 when N_Subprogram_Renaming_Declaration =>
5367 Error_Msg_N ("renamed subprograms not allowed in "
5368 & "limited with_clauses", N);
5371 when N_Package_Renaming_Declaration =>
5372 Error_Msg_N ("renamed packages not allowed in "
5373 & "limited with_clauses", N);
5377 raise Program_Error;
5380 -- Check if the chain is already built
5382 Spec := Specification (Unit (Library_Unit (N)));
5384 if Limited_View_Installed (Spec) then
5388 Set_Ekind (P, E_Package);
5390 -- Build the header of the limited_view
5393 Make_Defining_Identifier (Sloc (N),
5394 Chars => New_Internal_Name (Id_Char => 'Z'));
5395 Set_Ekind (Lim_Header, E_Package);
5396 Set_Is_Internal (Lim_Header);
5397 Set_Limited_View (P, Lim_Header);
5399 -- Create the auxiliary chain. All the shadow entities are appended to
5400 -- the list of entities of the limited-view header
5404 First_Decl => First (Visible_Declarations (Spec)));
5406 -- Save the last built shadow entity. It is needed later to set the
5407 -- reference to the first shadow entity in the private part
5409 Last_Pub_Lim_E := Last_Lim_E;
5411 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5412 -- Required to give support to limited-private-with clauses
5414 Build_Chain (Scope => P,
5415 First_Decl => First (Private_Declarations (Spec)));
5417 if Last_Pub_Lim_E /= Empty then
5418 Set_First_Private_Entity (Lim_Header,
5419 Next_Entity (Last_Pub_Lim_E));
5421 Set_First_Private_Entity (Lim_Header,
5425 Set_Limited_View_Installed (Spec);
5426 end Build_Limited_Views;
5428 -------------------------------
5429 -- Check_Body_Needed_For_SAL --
5430 -------------------------------
5432 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5434 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5435 -- Determine whether use of entity E might require the presence of its
5436 -- body. For a package this requires a recursive traversal of all nested
5439 ---------------------------
5440 -- Entity_Needed_For_SAL --
5441 ---------------------------
5443 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5447 if Is_Subprogram (E)
5448 and then Has_Pragma_Inline (E)
5452 elsif Ekind (E) = E_Generic_Function
5453 or else Ekind (E) = E_Generic_Procedure
5457 elsif Ekind (E) = E_Generic_Package
5459 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5460 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5464 elsif Ekind (E) = E_Package
5466 Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5467 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5469 Ent := First_Entity (E);
5470 while Present (Ent) loop
5471 if Entity_Needs_Body (Ent) then
5483 end Entity_Needs_Body;
5485 -- Start of processing for Check_Body_Needed_For_SAL
5488 if Ekind (Unit_Name) = E_Generic_Package
5490 Nkind (Unit_Declaration_Node (Unit_Name)) =
5491 N_Generic_Package_Declaration
5493 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5495 Set_Body_Needed_For_SAL (Unit_Name);
5497 elsif Ekind (Unit_Name) = E_Generic_Procedure
5498 or else Ekind (Unit_Name) = E_Generic_Function
5500 Set_Body_Needed_For_SAL (Unit_Name);
5502 elsif Is_Subprogram (Unit_Name)
5503 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5504 N_Subprogram_Declaration
5505 and then Has_Pragma_Inline (Unit_Name)
5507 Set_Body_Needed_For_SAL (Unit_Name);
5509 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5510 Check_Body_Needed_For_SAL
5511 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5513 elsif Ekind (Unit_Name) = E_Package
5514 and then Entity_Needs_Body (Unit_Name)
5516 Set_Body_Needed_For_SAL (Unit_Name);
5518 elsif Ekind (Unit_Name) = E_Package_Body
5519 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5521 Check_Body_Needed_For_SAL
5522 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5524 end Check_Body_Needed_For_SAL;
5526 --------------------
5527 -- Remove_Context --
5528 --------------------
5530 procedure Remove_Context (N : Node_Id) is
5531 Lib_Unit : constant Node_Id := Unit (N);
5534 -- If this is a child unit, first remove the parent units
5536 if Is_Child_Spec (Lib_Unit) then
5537 Remove_Parents (Lib_Unit);
5540 Remove_Context_Clauses (N);
5543 ----------------------------
5544 -- Remove_Context_Clauses --
5545 ----------------------------
5547 procedure Remove_Context_Clauses (N : Node_Id) is
5549 Unit_Name : Entity_Id;
5552 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5553 -- limited-views first and regular-views later (to maintain the
5556 -- First Phase: Remove limited_with context clauses
5558 Item := First (Context_Items (N));
5559 while Present (Item) loop
5561 -- We are interested only in with clauses which got installed
5564 if Nkind (Item) = N_With_Clause
5565 and then Limited_Present (Item)
5566 and then Limited_View_Installed (Item)
5568 Remove_Limited_With_Clause (Item);
5574 -- Second Phase: Loop through context items and undo regular
5575 -- with_clauses and use_clauses.
5577 Item := First (Context_Items (N));
5578 while Present (Item) loop
5580 -- We are interested only in with clauses which got installed on
5581 -- entry, as indicated by their Context_Installed flag set
5583 if Nkind (Item) = N_With_Clause
5584 and then Limited_Present (Item)
5585 and then Limited_View_Installed (Item)
5589 elsif Nkind (Item) = N_With_Clause
5590 and then Context_Installed (Item)
5592 -- Remove items from one with'ed unit
5594 Unit_Name := Entity (Name (Item));
5595 Remove_Unit_From_Visibility (Unit_Name);
5596 Set_Context_Installed (Item, False);
5598 elsif Nkind (Item) = N_Use_Package_Clause then
5599 End_Use_Package (Item);
5601 elsif Nkind (Item) = N_Use_Type_Clause then
5602 End_Use_Type (Item);
5607 end Remove_Context_Clauses;
5609 --------------------------------
5610 -- Remove_Limited_With_Clause --
5611 --------------------------------
5613 procedure Remove_Limited_With_Clause (N : Node_Id) is
5614 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5617 Lim_Header : Entity_Id;
5618 Lim_Typ : Entity_Id;
5622 pragma Assert (Limited_View_Installed (N));
5624 -- In case of limited with_clause on subprograms, generics, instances,
5625 -- or renamings, the corresponding error was previously posted and we
5626 -- have nothing to do here.
5628 if Nkind (P_Unit) /= N_Package_Declaration then
5632 P := Defining_Unit_Name (Specification (P_Unit));
5634 -- Handle child packages
5636 if Nkind (P) = N_Defining_Program_Unit_Name then
5637 P := Defining_Identifier (P);
5640 if Debug_Flag_I then
5641 Write_Str ("remove limited view of ");
5642 Write_Name (Chars (P));
5643 Write_Str (" from visibility");
5647 -- Prepare the removal of the shadow entities from visibility. The
5648 -- first element of the limited view is a header (an E_Package
5649 -- entity) that is used to reference the first shadow entity in the
5650 -- private part of the package
5652 Lim_Header := Limited_View (P);
5653 Lim_Typ := First_Entity (Lim_Header);
5655 -- Remove package and shadow entities from visibility if it has not
5658 if not Analyzed (P_Unit) then
5660 Set_Is_Immediately_Visible (P, False);
5662 while Present (Lim_Typ) loop
5664 Next_Entity (Lim_Typ);
5667 -- Otherwise this package has already appeared in the closure and its
5668 -- shadow entities must be replaced by its real entities. This code
5669 -- must be kept synchronized with the complementary code in Install
5670 -- Limited_Withed_Unit.
5673 -- Real entities that are type or subtype declarations were hidden
5674 -- from visibility at the point of installation of the limited-view.
5675 -- Now we recover the previous value of the hidden attribute.
5677 E := First_Entity (P);
5678 while Present (E) and then E /= First_Private_Entity (P) loop
5680 Set_Is_Hidden (E, Was_Hidden (E));
5686 while Present (Lim_Typ)
5687 and then Lim_Typ /= First_Private_Entity (Lim_Header)
5689 -- Nested packages and child units were not unchained
5691 if Ekind (Lim_Typ) /= E_Package
5692 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
5695 -- If the package has incomplete types, the limited view
5696 -- of the incomplete type is in fact never visible (AI05-129)
5697 -- but we have created a shadow entity E1 for it, that points
5698 -- to E2, a non-limited incomplete type. This in turn has a
5699 -- full view E3 that is the full declaration. There is a
5700 -- corresponding shadow entity E4. When reinstalling the
5701 -- non-limited view, E2 must become the current entity and
5702 -- E3 must be ignored.
5704 E := Non_Limited_View (Lim_Typ);
5706 if Present (Current_Entity (E))
5707 and then Ekind (Current_Entity (E)) = E_Incomplete_Type
5708 and then Full_View (Current_Entity (E)) = E
5711 -- Lim_Typ is the limited view of a full type declaration
5712 -- that has a previous incomplete declaration, i.e. E3
5713 -- from the previous description. Nothing to insert.
5718 pragma Assert (not In_Chain (E));
5720 Prev := Current_Entity (Lim_Typ);
5722 if Prev = Lim_Typ then
5723 Set_Current_Entity (E);
5726 while Present (Prev)
5727 and then Homonym (Prev) /= Lim_Typ
5729 Prev := Homonym (Prev);
5732 if Present (Prev) then
5733 Set_Homonym (Prev, E);
5737 -- Preserve structure of homonym chain
5739 Set_Homonym (E, Homonym (Lim_Typ));
5743 Next_Entity (Lim_Typ);
5747 -- Indicate that the limited view of the package is not installed
5749 Set_From_With_Type (P, False);
5750 Set_Limited_View_Installed (N, False);
5751 end Remove_Limited_With_Clause;
5753 --------------------
5754 -- Remove_Parents --
5755 --------------------
5757 procedure Remove_Parents (Lib_Unit : Node_Id) is
5760 P_Spec : Node_Id := Empty;
5762 Vis : constant Boolean :=
5763 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
5766 if Is_Child_Spec (Lib_Unit) then
5767 P_Spec := Parent_Spec (Lib_Unit);
5769 elsif Nkind (Lib_Unit) = N_Package_Body
5770 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
5772 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
5775 if Present (P_Spec) then
5778 P_Name := Get_Parent_Entity (P);
5779 Remove_Context_Clauses (P_Spec);
5780 End_Package_Scope (P_Name);
5781 Set_Is_Immediately_Visible (P_Name, Vis);
5783 -- Remove from visibility the siblings as well, which are directly
5784 -- visible while the parent is in scope.
5786 E := First_Entity (P_Name);
5787 while Present (E) loop
5788 if Is_Child_Unit (E) then
5789 Set_Is_Immediately_Visible (E, False);
5795 Set_In_Package_Body (P_Name, False);
5797 -- This is the recursive call to remove the context of any
5798 -- higher level parent. This recursion ensures that all parents
5799 -- are removed in the reverse order of their installation.
5805 ---------------------------------
5806 -- Remove_Private_With_Clauses --
5807 ---------------------------------
5809 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
5812 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
5813 -- Check whether a given unit appears in a regular with_clause.
5814 -- Used to determine whether a private_with_clause, implicit or
5815 -- explicit, should be ignored.
5817 ----------------------------
5818 -- In_Regular_With_Clause --
5819 ----------------------------
5821 function In_Regular_With_Clause (E : Entity_Id) return Boolean
5826 Item := First (Context_Items (Comp_Unit));
5827 while Present (Item) loop
5828 if Nkind (Item) = N_With_Clause
5829 and then Entity (Name (Item)) = E
5830 and then not Private_Present (Item)
5838 end In_Regular_With_Clause;
5840 -- Start of processing for Remove_Private_With_Clauses
5843 Item := First (Context_Items (Comp_Unit));
5844 while Present (Item) loop
5845 if Nkind (Item) = N_With_Clause
5846 and then Private_Present (Item)
5848 -- If private_with_clause is redundant, remove it from
5849 -- context, as a small optimization to subsequent handling
5850 -- of private_with clauses in other nested packages..
5852 if In_Regular_With_Clause (Entity (Name (Item))) then
5854 Nxt : constant Node_Id := Next (Item);
5860 elsif Limited_Present (Item) then
5861 if not Limited_View_Installed (Item) then
5862 Remove_Limited_With_Clause (Item);
5868 Remove_Unit_From_Visibility (Entity (Name (Item)));
5869 Set_Context_Installed (Item, False);
5877 end Remove_Private_With_Clauses;
5879 ---------------------------------
5880 -- Remove_Unit_From_Visibility --
5881 ---------------------------------
5883 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
5884 P : constant Entity_Id := Scope (Unit_Name);
5887 if Debug_Flag_I then
5888 Write_Str ("remove unit ");
5889 Write_Name (Chars (Unit_Name));
5890 Write_Str (" from visibility");
5894 if P /= Standard_Standard then
5895 Set_Is_Visible_Child_Unit (Unit_Name, False);
5898 Set_Is_Potentially_Use_Visible (Unit_Name, False);
5899 Set_Is_Immediately_Visible (Unit_Name, False);
5900 end Remove_Unit_From_Visibility;
5915 procedure Unchain (E : Entity_Id) is
5919 Prev := Current_Entity (E);
5925 Set_Name_Entity_Id (Chars (E), Homonym (E));
5928 while Present (Prev)
5929 and then Homonym (Prev) /= E
5931 Prev := Homonym (Prev);
5934 if Present (Prev) then
5935 Set_Homonym (Prev, Homonym (E));
5939 if Debug_Flag_I then
5940 Write_Str (" (homonym) unchain ");
5941 Write_Name (Chars (E));
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