1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2013, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Debug; use Debug;
28 with Einfo; use Einfo;
29 with Errout; use Errout;
30 with Exp_Util; use Exp_Util;
31 with Elists; use Elists;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
35 with Impunit; use Impunit;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Namet; use Namet;
41 with Nlists; use Nlists;
42 with Nmake; use Nmake;
44 with Output; use Output;
45 with Par_SCO; use Par_SCO;
46 with Restrict; use Restrict;
47 with Rident; use Rident;
48 with Rtsfind; use Rtsfind;
50 with Sem_Aux; use Sem_Aux;
51 with Sem_Ch3; use Sem_Ch3;
52 with Sem_Ch6; use Sem_Ch6;
53 with Sem_Ch7; use Sem_Ch7;
54 with Sem_Ch8; use Sem_Ch8;
55 with Sem_Dist; use Sem_Dist;
56 with Sem_Prag; use Sem_Prag;
57 with Sem_Util; use Sem_Util;
58 with Sem_Warn; use Sem_Warn;
59 with Stand; use Stand;
60 with Sinfo; use Sinfo;
61 with Sinfo.CN; use Sinfo.CN;
62 with Sinput; use Sinput;
63 with Snames; use Snames;
64 with Style; use Style;
65 with Stylesw; use Stylesw;
66 with Tbuild; use Tbuild;
67 with Uname; use Uname;
69 package body Sem_Ch10 is
71 -----------------------
72 -- Local Subprograms --
73 -----------------------
75 procedure Analyze_Context (N : Node_Id);
76 -- Analyzes items in the context clause of compilation unit
78 procedure Build_Limited_Views (N : Node_Id);
79 -- Build and decorate the list of shadow entities for a package mentioned
80 -- in a limited_with clause. If the package was not previously analyzed
81 -- then it also performs a basic decoration of the real entities. This is
82 -- required to do not pass non-decorated entities to the back-end.
83 -- Implements Ada 2005 (AI-50217).
85 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id);
86 -- Check whether the source for the body of a compilation unit must be
87 -- included in a standalone library.
89 procedure Check_Private_Child_Unit (N : Node_Id);
90 -- If a with_clause mentions a private child unit, the compilation unit
91 -- must be a member of the same family, as described in 10.1.2.
93 procedure Check_Stub_Level (N : Node_Id);
94 -- Verify that a stub is declared immediately within a compilation unit,
95 -- and not in an inner frame.
97 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id);
98 -- When a child unit appears in a context clause, the implicit withs on
99 -- parents are made explicit, and with clauses are inserted in the context
100 -- clause before the one for the child. If a parent in the with_clause
101 -- is a renaming, the implicit with_clause is on the renaming whose name
102 -- is mentioned in the with_clause, and not on the package it renames.
103 -- N is the compilation unit whose list of context items receives the
104 -- implicit with_clauses.
106 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
107 -- Get defining entity of parent unit of a child unit. In most cases this
108 -- is the defining entity of the unit, but for a child instance whose
109 -- parent needs a body for inlining, the instantiation node of the parent
110 -- has not yet been rewritten as a package declaration, and the entity has
111 -- to be retrieved from the Instance_Spec of the unit.
113 function Has_With_Clause
116 Is_Limited : Boolean := False) return Boolean;
117 -- Determine whether compilation unit C_Unit contains a [limited] with
118 -- clause for package Pack. Use the flag Is_Limited to designate desired
121 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id);
122 -- If the main unit is a child unit, implicit withs are also added for
123 -- all its ancestors.
125 function In_Chain (E : Entity_Id) return Boolean;
126 -- Check that the shadow entity is not already in the homonym chain, for
127 -- example through a limited_with clause in a parent unit.
129 procedure Install_Context_Clauses (N : Node_Id);
130 -- Subsidiary to Install_Context and Install_Parents. Process all with
131 -- and use clauses for current unit and its library unit if any.
133 procedure Install_Limited_Context_Clauses (N : Node_Id);
134 -- Subsidiary to Install_Context. Process only limited with_clauses for
135 -- current unit. Implements Ada 2005 (AI-50217).
137 procedure Install_Limited_Withed_Unit (N : Node_Id);
138 -- Place shadow entities for a limited_with package in the visibility
139 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
141 procedure Install_Withed_Unit
142 (With_Clause : Node_Id;
143 Private_With_OK : Boolean := False);
144 -- If the unit is not a child unit, make unit immediately visible. The
145 -- caller ensures that the unit is not already currently installed. The
146 -- flag Private_With_OK is set true in Install_Private_With_Clauses, which
147 -- is called when compiling the private part of a package, or installing
148 -- the private declarations of a parent unit.
150 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean);
151 -- This procedure establishes the context for the compilation of a child
152 -- unit. If Lib_Unit is a child library spec then the context of the parent
153 -- is installed, and the parent itself made immediately visible, so that
154 -- the child unit is processed in the declarative region of the parent.
155 -- Install_Parents makes a recursive call to itself to ensure that all
156 -- parents are loaded in the nested case. If Lib_Unit is a library body,
157 -- the only effect of Install_Parents is to install the private decls of
158 -- the parents, because the visible parent declarations will have been
159 -- installed as part of the context of the corresponding spec.
161 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id);
162 -- In the compilation of a child unit, a child of any of the ancestor
163 -- units is directly visible if it is visible, because the parent is in
164 -- an enclosing scope. Iterate over context to find child units of U_Name
165 -- or of some ancestor of it.
167 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean;
168 -- When compiling a unit Q descended from some parent unit P, a limited
169 -- with_clause in the context of P that names some other ancestor of Q
170 -- must not be installed because the ancestor is immediately visible.
172 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean;
173 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
174 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
175 -- a library spec that has a parent. If the call to Is_Child_Spec returns
176 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
177 -- compilation unit for the parent spec.
179 -- Lib_Unit can also be a subprogram body that acts as its own spec. If the
180 -- Parent_Spec is non-empty, this is also a child unit.
182 procedure Remove_Context_Clauses (N : Node_Id);
183 -- Subsidiary of previous one. Remove use_ and with_clauses
185 procedure Remove_Limited_With_Clause (N : Node_Id);
186 -- Remove from visibility the shadow entities introduced for a package
187 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
189 procedure Remove_Parents (Lib_Unit : Node_Id);
190 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
191 -- contexts established by the corresponding call to Install_Parents are
192 -- removed. Remove_Parents contains a recursive call to itself to ensure
193 -- that all parents are removed in the nested case.
195 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
196 -- Reset all visibility flags on unit after compiling it, either as a main
197 -- unit or as a unit in the context.
199 procedure Unchain (E : Entity_Id);
200 -- Remove single entity from visibility list
202 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
203 -- Common processing for all stubs (subprograms, tasks, packages, and
204 -- protected cases). N is the stub to be analyzed. Once the subunit name
205 -- is established, load and analyze. Nam is the non-overloadable entity
206 -- for which the proper body provides a completion. Subprogram stubs are
207 -- handled differently because they can be declarations.
210 -- A dummy procedure, for debugging use, called just before analyzing the
211 -- main unit (after dealing with any context clauses).
213 --------------------------
214 -- Limited_With_Clauses --
215 --------------------------
217 -- Limited_With clauses are the mechanism chosen for Ada 2005 to support
218 -- mutually recursive types declared in different units. A limited_with
219 -- clause that names package P in the context of unit U makes the types
220 -- declared in the visible part of P available within U, but with the
221 -- restriction that these types can only be used as incomplete types.
222 -- The limited_with clause does not impose a semantic dependence on P,
223 -- and it is possible for two packages to have limited_with_clauses on
224 -- each other without creating an elaboration circularity.
226 -- To support this feature, the analysis of a limited_with clause must
227 -- create an abbreviated view of the package, without performing any
228 -- semantic analysis on it. This "package abstract" contains shadow types
229 -- that are in one-one correspondence with the real types in the package,
230 -- and that have the properties of incomplete types.
232 -- The implementation creates two element lists: one to chain the shadow
233 -- entities, and one to chain the corresponding type entities in the tree
234 -- of the package. Links between corresponding entities in both chains
235 -- allow the compiler to select the proper view of a given type, depending
236 -- on the context. Note that in contrast with the handling of private
237 -- types, the limited view and the non-limited view of a type are treated
238 -- as separate entities, and no entity exchange needs to take place, which
239 -- makes the implementation must simpler than could be feared.
241 ------------------------------
242 -- Analyze_Compilation_Unit --
243 ------------------------------
245 procedure Analyze_Compilation_Unit (N : Node_Id) is
246 Unit_Node : constant Node_Id := Unit (N);
247 Lib_Unit : Node_Id := Library_Unit (N);
249 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
250 Par_Spec_Name : Unit_Name_Type;
251 Unum : Unit_Number_Type;
253 procedure Check_Redundant_Withs
254 (Context_Items : List_Id;
255 Spec_Context_Items : List_Id := No_List);
256 -- Determine whether the context list of a compilation unit contains
257 -- redundant with clauses. When checking body clauses against spec
258 -- clauses, set Context_Items to the context list of the body and
259 -- Spec_Context_Items to that of the spec. Parent packages are not
260 -- examined for documentation purposes.
262 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
263 -- Generate cross-reference information for the parents of child units.
264 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
266 ---------------------------
267 -- Check_Redundant_Withs --
268 ---------------------------
270 procedure Check_Redundant_Withs
271 (Context_Items : List_Id;
272 Spec_Context_Items : List_Id := No_List)
276 procedure Process_Body_Clauses
277 (Context_List : List_Id;
279 Used : in out Boolean;
280 Used_Type_Or_Elab : in out Boolean);
281 -- Examine the context clauses of a package body, trying to match the
282 -- name entity of Clause with any list element. If the match occurs
283 -- on a use package clause set Used to True, for a use type clause or
284 -- pragma Elaborate[_All], set Used_Type_Or_Elab to True.
286 procedure Process_Spec_Clauses
287 (Context_List : List_Id;
289 Used : in out Boolean;
290 Withed : in out Boolean;
291 Exit_On_Self : Boolean := False);
292 -- Examine the context clauses of a package spec, trying to match
293 -- the name entity of Clause with any list element. If the match
294 -- occurs on a use package clause, set Used to True, for a with
295 -- package clause other than Clause, set Withed to True. Limited
296 -- with clauses, implicitly generated with clauses and withs
297 -- having pragmas Elaborate or Elaborate_All applied to them are
298 -- skipped. Exit_On_Self is used to control the search loop and
299 -- force an exit whenever Clause sees itself in the search.
301 --------------------------
302 -- Process_Body_Clauses --
303 --------------------------
305 procedure Process_Body_Clauses
306 (Context_List : List_Id;
308 Used : in out Boolean;
309 Used_Type_Or_Elab : in out Boolean)
311 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
317 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean;
318 -- In an expanded name in a use clause, if the prefix is a renamed
319 -- package, the entity is set to the original package as a result,
320 -- when checking whether the package appears in a previous with
321 -- clause, the renaming has to be taken into account, to prevent
322 -- spurious/incorrect warnings. A common case is use of Text_IO.
328 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean is
330 return Entity (N) = P
332 (Present (Renamed_Object (P))
333 and then Entity (N) = Renamed_Object (P));
336 -- Start of processing for Process_Body_Clauses
340 Used_Type_Or_Elab := False;
342 Cont_Item := First (Context_List);
343 while Present (Cont_Item) loop
345 -- Package use clause
347 if Nkind (Cont_Item) = N_Use_Package_Clause
350 -- Search through use clauses
352 Use_Item := First (Names (Cont_Item));
353 while Present (Use_Item) and then not Used loop
355 -- Case of a direct use of the one we are looking for
357 if Entity (Use_Item) = Nam_Ent then
360 -- Handle nested case, as in "with P; use P.Q.R"
367 -- Loop through prefixes looking for match
370 while Nkind (UE) = N_Expanded_Name loop
371 if Same_Unit (Prefix (UE), Nam_Ent) then
386 elsif Nkind (Cont_Item) = N_Use_Type_Clause
387 and then not Used_Type_Or_Elab
389 Subt_Mark := First (Subtype_Marks (Cont_Item));
390 while Present (Subt_Mark)
391 and then not Used_Type_Or_Elab
393 if Same_Unit (Prefix (Subt_Mark), Nam_Ent) then
394 Used_Type_Or_Elab := True;
400 -- Pragma Elaborate or Elaborate_All
402 elsif Nkind (Cont_Item) = N_Pragma
404 (Pragma_Name (Cont_Item) = Name_Elaborate
406 Pragma_Name (Cont_Item) = Name_Elaborate_All)
407 and then not Used_Type_Or_Elab
410 First (Pragma_Argument_Associations (Cont_Item));
411 while Present (Prag_Unit)
412 and then not Used_Type_Or_Elab
414 if Entity (Expression (Prag_Unit)) = Nam_Ent then
415 Used_Type_Or_Elab := True;
424 end Process_Body_Clauses;
426 --------------------------
427 -- Process_Spec_Clauses --
428 --------------------------
430 procedure Process_Spec_Clauses
431 (Context_List : List_Id;
433 Used : in out Boolean;
434 Withed : in out Boolean;
435 Exit_On_Self : Boolean := False)
437 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
445 Cont_Item := First (Context_List);
446 while Present (Cont_Item) loop
448 -- Stop the search since the context items after Cont_Item have
449 -- already been examined in a previous iteration of the reverse
450 -- loop in Check_Redundant_Withs.
453 and Cont_Item = Clause
458 -- Package use clause
460 if Nkind (Cont_Item) = N_Use_Package_Clause
463 Use_Item := First (Names (Cont_Item));
464 while Present (Use_Item) and then not Used loop
465 if Entity (Use_Item) = Nam_Ent then
472 -- Package with clause. Avoid processing self, implicitly
473 -- generated with clauses or limited with clauses. Note that
474 -- we examine with clauses having pragmas Elaborate or
475 -- Elaborate_All applied to them due to cases such as:
479 -- pragma Elaborate (Pack);
481 -- In this case, the second with clause is redundant since
482 -- the pragma applies only to the first "with Pack;".
484 -- Note that we only consider with_clauses that comes from
485 -- source. In the case of renamings used as prefixes of names
486 -- in with_clauses, we generate a with_clause for the prefix,
487 -- which we do not treat as implicit because it is needed for
488 -- visibility analysis, but is also not redundant.
490 elsif Nkind (Cont_Item) = N_With_Clause
491 and then not Implicit_With (Cont_Item)
492 and then Comes_From_Source (Cont_Item)
493 and then not Limited_Present (Cont_Item)
494 and then Cont_Item /= Clause
495 and then Entity (Name (Cont_Item)) = Nam_Ent
502 end Process_Spec_Clauses;
504 -- Start of processing for Check_Redundant_Withs
507 Clause := Last (Context_Items);
508 while Present (Clause) loop
510 -- Avoid checking implicitly generated with clauses, limited with
511 -- clauses or withs that have pragma Elaborate or Elaborate_All.
513 if Nkind (Clause) = N_With_Clause
514 and then not Implicit_With (Clause)
515 and then not Limited_Present (Clause)
516 and then not Elaborate_Present (Clause)
518 -- Package body-to-spec check
520 if Present (Spec_Context_Items) then
522 Used_In_Body : Boolean := False;
523 Used_In_Spec : Boolean := False;
524 Used_Type_Or_Elab : Boolean := False;
525 Withed_In_Spec : Boolean := False;
529 (Context_List => Spec_Context_Items,
531 Used => Used_In_Spec,
532 Withed => Withed_In_Spec);
535 (Context_List => Context_Items,
537 Used => Used_In_Body,
538 Used_Type_Or_Elab => Used_Type_Or_Elab);
540 -- "Type Elab" refers to the presence of either a use
541 -- type clause, pragmas Elaborate or Elaborate_All.
543 -- +---------------+---------------------------+------+
544 -- | Spec | Body | Warn |
545 -- +--------+------+--------+------+-----------+------+
546 -- | Withed | Used | Withed | Used | Type Elab | |
547 -- | X | | X | | | X |
548 -- | X | | X | X | | |
549 -- | X | | X | | X | |
550 -- | X | | X | X | X | |
551 -- | X | X | X | | | X |
552 -- | X | X | X | | X | |
553 -- | X | X | X | X | | X |
554 -- | X | X | X | X | X | |
555 -- +--------+------+--------+------+-----------+------+
558 and then not Used_Type_Or_Elab)
561 and then not Used_In_Body)
565 Error_Msg_N -- CODEFIX
566 ("redundant with clause in body??", Clause);
569 Used_In_Body := False;
570 Used_In_Spec := False;
571 Used_Type_Or_Elab := False;
572 Withed_In_Spec := False;
575 -- Standalone package spec or body check
579 Dont_Care : Boolean := False;
580 Withed : Boolean := False;
583 -- The mechanism for examining the context clauses of a
584 -- package spec can be applied to package body clauses.
587 (Context_List => Context_Items,
591 Exit_On_Self => True);
594 Error_Msg_N -- CODEFIX
595 ("redundant with clause??", Clause);
603 end Check_Redundant_Withs;
605 --------------------------------
606 -- Generate_Parent_References --
607 --------------------------------
609 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is
611 P_Name : Entity_Id := P_Id;
614 Pref := Name (Parent (Defining_Entity (N)));
616 if Nkind (Pref) = N_Expanded_Name then
618 -- Done already, if the unit has been compiled indirectly as
619 -- part of the closure of its context because of inlining.
624 while Nkind (Pref) = N_Selected_Component loop
625 Change_Selected_Component_To_Expanded_Name (Pref);
626 Set_Entity (Pref, P_Name);
627 Set_Etype (Pref, Etype (P_Name));
628 Generate_Reference (P_Name, Pref, 'r');
629 Pref := Prefix (Pref);
630 P_Name := Scope (P_Name);
633 -- The guard here on P_Name is to handle the error condition where
634 -- the parent unit is missing because the file was not found.
636 if Present (P_Name) then
637 Set_Entity (Pref, P_Name);
638 Set_Etype (Pref, Etype (P_Name));
639 Generate_Reference (P_Name, Pref, 'r');
640 Style.Check_Identifier (Pref, P_Name);
642 end Generate_Parent_References;
644 -- Start of processing for Analyze_Compilation_Unit
647 Process_Compilation_Unit_Pragmas (N);
649 -- If the unit is a subunit whose parent has not been analyzed (which
650 -- indicates that the main unit is a subunit, either the current one or
651 -- one of its descendents) then the subunit is compiled as part of the
652 -- analysis of the parent, which we proceed to do. Basically this gets
653 -- handled from the top down and we don't want to do anything at this
654 -- level (i.e. this subunit will be handled on the way down from the
655 -- parent), so at this level we immediately return. If the subunit ends
656 -- up not analyzed, it means that the parent did not contain a stub for
657 -- it, or that there errors were detected in some ancestor.
659 if Nkind (Unit_Node) = N_Subunit and then not Analyzed (Lib_Unit) then
660 Semantics (Lib_Unit);
662 if not Analyzed (Proper_Body (Unit_Node)) then
663 if Serious_Errors_Detected > 0 then
664 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N);
666 Error_Msg_N ("missing stub for subunit", N);
673 -- Analyze context (this will call Sem recursively for with'ed units) To
674 -- detect circularities among with-clauses that are not caught during
675 -- loading, we set the Context_Pending flag on the current unit. If the
676 -- flag is already set there is a potential circularity. We exclude
677 -- predefined units from this check because they are known to be safe.
678 -- We also exclude package bodies that are present because circularities
679 -- between bodies are harmless (and necessary).
681 if Context_Pending (N) then
683 Circularity : Boolean := True;
686 if Is_Predefined_File_Name
687 (Unit_File_Name (Get_Source_Unit (Unit (N))))
689 Circularity := False;
692 for U in Main_Unit + 1 .. Last_Unit loop
693 if Nkind (Unit (Cunit (U))) = N_Package_Body
694 and then not Analyzed (Cunit (U))
696 Circularity := False;
703 Error_Msg_N ("circular dependency caused by with_clauses", N);
705 ("\possibly missing limited_with clause"
706 & " in one of the following", N);
708 for U in Main_Unit .. Last_Unit loop
709 if Context_Pending (Cunit (U)) then
710 Error_Msg_Unit_1 := Get_Unit_Name (Unit (Cunit (U)));
711 Error_Msg_N ("\unit$", N);
715 raise Unrecoverable_Error;
719 Set_Context_Pending (N);
724 Set_Context_Pending (N, False);
726 -- If the unit is a package body, the spec is already loaded and must be
727 -- analyzed first, before we analyze the body.
729 if Nkind (Unit_Node) = N_Package_Body then
731 -- If no Lib_Unit, then there was a serious previous error, so just
732 -- ignore the entire analysis effort
734 if No (Lib_Unit) then
735 Check_Error_Detected;
739 -- Analyze the package spec
741 Semantics (Lib_Unit);
743 -- Check for unused with's
745 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
747 -- Verify that the library unit is a package declaration
749 if not Nkind_In (Unit (Lib_Unit), N_Package_Declaration,
750 N_Generic_Package_Declaration)
753 ("no legal package declaration for package body", N);
756 -- Otherwise, the entity in the declaration is visible. Update the
757 -- version to reflect dependence of this body on the spec.
760 Spec_Id := Defining_Entity (Unit (Lib_Unit));
761 Set_Is_Immediately_Visible (Spec_Id, True);
762 Version_Update (N, Lib_Unit);
764 if Nkind (Defining_Unit_Name (Unit_Node)) =
765 N_Defining_Program_Unit_Name
767 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
772 -- If the unit is a subprogram body, then we similarly need to analyze
773 -- its spec. However, things are a little simpler in this case, because
774 -- here, this analysis is done mostly for error checking and consistency
775 -- purposes (but not only, e.g. there could be a contract on the spec),
776 -- so there's nothing else to be done.
778 elsif Nkind (Unit_Node) = N_Subprogram_Body then
779 if Acts_As_Spec (N) then
781 -- If the subprogram body is a child unit, we must create a
782 -- declaration for it, in order to properly load the parent(s).
783 -- After this, the original unit does not acts as a spec, because
784 -- there is an explicit one. If this unit appears in a context
785 -- clause, then an implicit with on the parent will be added when
786 -- installing the context. If this is the main unit, there is no
787 -- Unit_Table entry for the declaration (it has the unit number
788 -- of the main unit) and code generation is unaffected.
790 Unum := Get_Cunit_Unit_Number (N);
791 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
793 if Par_Spec_Name /= No_Unit_Name then
796 (Load_Name => Par_Spec_Name,
801 if Unum /= No_Unit then
803 -- Build subprogram declaration and attach parent unit to it
804 -- This subprogram declaration does not come from source,
805 -- Nevertheless the backend must generate debugging info for
806 -- it, and this must be indicated explicitly. We also mark
807 -- the body entity as a child unit now, to prevent a
808 -- cascaded error if the spec entity cannot be entered
809 -- in its scope. Finally we create a Units table entry for
810 -- the subprogram declaration, to maintain a one-to-one
811 -- correspondence with compilation unit nodes. This is
812 -- critical for the tree traversals performed by CodePeer.
815 Loc : constant Source_Ptr := Sloc (N);
816 SCS : constant Boolean :=
817 Get_Comes_From_Source_Default;
820 Set_Comes_From_Source_Default (False);
822 -- Checks for redundant USE TYPE clauses have a special
823 -- exception for the synthetic spec we create here. This
824 -- special case relies on the two compilation units
825 -- sharing the same context clause.
827 -- Note: We used to do a shallow copy (New_Copy_List),
828 -- which defeated those checks and also created malformed
829 -- trees (subtype mark shared by two distinct
830 -- N_Use_Type_Clause nodes) which crashed the compiler.
833 Make_Compilation_Unit (Loc,
834 Context_Items => Context_Items (N),
836 Make_Subprogram_Declaration (Sloc (N),
839 (Specification (Unit_Node))),
841 Make_Compilation_Unit_Aux (Loc));
843 Set_Library_Unit (N, Lib_Unit);
844 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
845 Make_Child_Decl_Unit (N);
846 Semantics (Lib_Unit);
848 -- Now that a separate declaration exists, the body
849 -- of the child unit does not act as spec any longer.
851 Set_Acts_As_Spec (N, False);
852 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
853 Set_Debug_Info_Needed (Defining_Entity (Unit (Lib_Unit)));
854 Set_Comes_From_Source_Default (SCS);
859 -- Here for subprogram with separate declaration
862 Semantics (Lib_Unit);
863 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
864 Version_Update (N, Lib_Unit);
867 -- If this is a child unit, generate references to the parents
869 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
870 N_Defining_Program_Unit_Name
872 Generate_Parent_References (
873 Specification (Unit_Node),
874 Scope (Defining_Entity (Unit (Lib_Unit))));
878 -- If it is a child unit, the parent must be elaborated first and we
879 -- update version, since we are dependent on our parent.
881 if Is_Child_Spec (Unit_Node) then
883 -- The analysis of the parent is done with style checks off
886 Save_Style_Check : constant Boolean := Style_Check;
889 if not GNAT_Mode then
890 Style_Check := False;
893 Semantics (Parent_Spec (Unit_Node));
894 Version_Update (N, Parent_Spec (Unit_Node));
896 -- Restore style check settings
898 Style_Check := Save_Style_Check;
902 -- With the analysis done, install the context. Note that we can't
903 -- install the context from the with clauses as we analyze them, because
904 -- each with clause must be analyzed in a clean visibility context, so
905 -- we have to wait and install them all at once.
909 if Is_Child_Spec (Unit_Node) then
911 -- Set the entities of all parents in the program_unit_name
913 Generate_Parent_References (
914 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
917 -- All components of the context: with-clauses, library unit, ancestors
918 -- if any, (and their context) are analyzed and installed.
920 -- Call special debug routine sm if this is the main unit
922 if Current_Sem_Unit = Main_Unit then
926 -- Now analyze the unit (package, subprogram spec, body) itself
930 if Warn_On_Redundant_Constructs then
931 Check_Redundant_Withs (Context_Items (N));
933 if Nkind (Unit_Node) = N_Package_Body then
934 Check_Redundant_Withs
935 (Context_Items => Context_Items (N),
936 Spec_Context_Items => Context_Items (Lib_Unit));
940 -- The above call might have made Unit_Node an N_Subprogram_Body from
941 -- something else, so propagate any Acts_As_Spec flag.
943 if Nkind (Unit_Node) = N_Subprogram_Body
944 and then Acts_As_Spec (Unit_Node)
946 Set_Acts_As_Spec (N);
949 -- Register predefined units in Rtsfind
952 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
954 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
955 Set_RTU_Loaded (Unit_Node);
959 -- Treat compilation unit pragmas that appear after the library unit
961 if Present (Pragmas_After (Aux_Decls_Node (N))) then
963 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
965 while Present (Prag_Node) loop
972 -- Generate distribution stubs if requested and no error
975 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
977 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
978 and then not Fatal_Error (Main_Unit)
980 if Is_RCI_Pkg_Spec_Or_Body (N) then
982 -- Regular RCI package
984 Add_Stub_Constructs (N);
986 elsif (Nkind (Unit_Node) = N_Package_Declaration
987 and then Is_Shared_Passive (Defining_Entity
988 (Specification (Unit_Node))))
989 or else (Nkind (Unit_Node) = N_Package_Body
991 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
993 -- Shared passive package
995 Add_Stub_Constructs (N);
997 elsif Nkind (Unit_Node) = N_Package_Instantiation
999 Is_Remote_Call_Interface
1000 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
1002 -- Instantiation of a RCI generic package
1004 Add_Stub_Constructs (N);
1008 -- Remove unit from visibility, so that environment is clean for the
1009 -- next compilation, which is either the main unit or some other unit
1012 if Nkind_In (Unit_Node, N_Package_Declaration,
1013 N_Package_Renaming_Declaration,
1014 N_Subprogram_Declaration)
1015 or else Nkind (Unit_Node) in N_Generic_Declaration
1017 (Nkind (Unit_Node) = N_Subprogram_Body
1018 and then Acts_As_Spec (Unit_Node))
1020 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
1022 -- If the unit is an instantiation whose body will be elaborated for
1023 -- inlining purposes, use the proper entity of the instance. The entity
1024 -- may be missing if the instantiation was illegal.
1026 elsif Nkind (Unit_Node) = N_Package_Instantiation
1027 and then not Error_Posted (Unit_Node)
1028 and then Present (Instance_Spec (Unit_Node))
1030 Remove_Unit_From_Visibility
1031 (Defining_Entity (Instance_Spec (Unit_Node)));
1033 elsif Nkind (Unit_Node) = N_Package_Body
1034 or else (Nkind (Unit_Node) = N_Subprogram_Body
1035 and then not Acts_As_Spec (Unit_Node))
1037 -- Bodies that are not the main unit are compiled if they are generic
1038 -- or contain generic or inlined units. Their analysis brings in the
1039 -- context of the corresponding spec (unit declaration) which must be
1040 -- removed as well, to return the compilation environment to its
1043 Remove_Context (Lib_Unit);
1044 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
1047 -- Last step is to deinstall the context we just installed as well as
1048 -- the unit just compiled.
1052 -- If this is the main unit and we are generating code, we must check
1053 -- that all generic units in the context have a body if they need it,
1054 -- even if they have not been instantiated. In the absence of .ali files
1055 -- for generic units, we must force the load of the body, just to
1056 -- produce the proper error if the body is absent. We skip this
1057 -- verification if the main unit itself is generic.
1059 if Get_Cunit_Unit_Number (N) = Main_Unit
1060 and then Operating_Mode = Generate_Code
1061 and then Expander_Active
1063 -- Check whether the source for the body of the unit must be included
1064 -- in a standalone library.
1066 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
1068 -- Indicate that the main unit is now analyzed, to catch possible
1069 -- circularities between it and generic bodies. Remove main unit from
1070 -- visibility. This might seem superfluous, but the main unit must
1071 -- not be visible in the generic body expansions that follow.
1073 Set_Analyzed (N, True);
1074 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
1079 Un : Unit_Number_Type;
1081 Save_Style_Check : constant Boolean := Style_Check;
1084 Item := First (Context_Items (N));
1085 while Present (Item) loop
1087 -- Check for explicit with clause
1089 if Nkind (Item) = N_With_Clause
1090 and then not Implicit_With (Item)
1092 -- Ada 2005 (AI-50217): Ignore limited-withed units
1094 and then not Limited_Present (Item)
1096 Nam := Entity (Name (Item));
1098 -- Compile generic subprogram, unless it is intrinsic or
1099 -- imported so no body is required, or generic package body
1100 -- if the package spec requires a body.
1102 if (Is_Generic_Subprogram (Nam)
1103 and then not Is_Intrinsic_Subprogram (Nam)
1104 and then not Is_Imported (Nam))
1105 or else (Ekind (Nam) = E_Generic_Package
1106 and then Unit_Requires_Body (Nam))
1108 Style_Check := False;
1110 if Present (Renamed_Object (Nam)) then
1113 (Load_Name => Get_Body_Name
1115 (Unit_Declaration_Node
1116 (Renamed_Object (Nam)))),
1124 (Load_Name => Get_Body_Name
1125 (Get_Unit_Name (Item)),
1132 if Un = No_Unit then
1134 ("body of generic unit& not found", Item, Nam);
1137 elsif not Analyzed (Cunit (Un))
1138 and then Un /= Main_Unit
1139 and then not Fatal_Error (Un)
1141 Style_Check := False;
1142 Semantics (Cunit (Un));
1150 -- Restore style checks settings
1152 Style_Check := Save_Style_Check;
1156 -- Deal with creating elaboration Boolean if needed. We create an
1157 -- elaboration boolean only for units that come from source since
1158 -- units manufactured by the compiler never need elab checks.
1160 if Comes_From_Source (N)
1161 and then Nkind_In (Unit_Node, N_Package_Declaration,
1162 N_Generic_Package_Declaration,
1163 N_Subprogram_Declaration,
1164 N_Generic_Subprogram_Declaration)
1167 Loc : constant Source_Ptr := Sloc (N);
1168 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1171 Spec_Id := Defining_Entity (Unit_Node);
1172 Generate_Definition (Spec_Id);
1174 -- See if an elaboration entity is required for possible access
1175 -- before elaboration checking. Note that we must allow for this
1176 -- even if -gnatE is not set, since a client may be compiled in
1177 -- -gnatE mode and reference the entity.
1179 -- These entities are also used by the binder to prevent multiple
1180 -- attempts to execute the elaboration code for the library case
1181 -- where the elaboration routine might otherwise be called more
1184 -- Case of units which do not require elaboration checks
1187 -- Pure units do not need checks
1191 -- Preelaborated units do not need checks
1193 or else Is_Preelaborated (Spec_Id)
1195 -- No checks needed if pragma Elaborate_Body present
1197 or else Has_Pragma_Elaborate_Body (Spec_Id)
1199 -- No checks needed if unit does not require a body
1201 or else not Unit_Requires_Body (Spec_Id)
1203 -- No checks needed for predefined files
1205 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1207 -- No checks required if no separate spec
1209 or else Acts_As_Spec (N)
1211 -- This is a case where we only need the entity for
1212 -- checking to prevent multiple elaboration checks.
1214 Set_Elaboration_Entity_Required (Spec_Id, False);
1216 -- Case of elaboration entity is required for access before
1217 -- elaboration checking (so certainly we must build it!)
1220 Set_Elaboration_Entity_Required (Spec_Id, True);
1223 Build_Elaboration_Entity (N, Spec_Id);
1227 -- Freeze the compilation unit entity. This for sure is needed because
1228 -- of some warnings that can be output (see Freeze_Subprogram), but may
1229 -- in general be required. If freezing actions result, place them in the
1230 -- compilation unit actions list, and analyze them.
1233 L : constant List_Id :=
1234 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), N);
1236 while Is_Non_Empty_List (L) loop
1237 Insert_Library_Level_Action (Remove_Head (L));
1243 if Nkind (Unit_Node) = N_Package_Declaration
1244 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1245 and then Expander_Active
1248 Save_Style_Check : constant Boolean := Style_Check;
1249 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1250 Options : Style_Check_Options;
1253 Save_Style_Check_Options (Options);
1254 Reset_Style_Check_Options;
1255 Opt.Warning_Mode := Suppress;
1256 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1258 Reset_Style_Check_Options;
1259 Set_Style_Check_Options (Options);
1260 Style_Check := Save_Style_Check;
1261 Warning_Mode := Save_Warning;
1265 -- If we are generating obsolescent warnings, then here is where we
1266 -- generate them for the with'ed items. The reason for this special
1267 -- processing is that the normal mechanism of generating the warnings
1268 -- for referenced entities does not work for context clause references.
1269 -- That's because when we first analyze the context, it is too early to
1270 -- know if the with'ing unit is itself obsolescent (which suppresses
1274 and then Warn_On_Obsolescent_Feature
1275 and then Nkind (Unit_Node) not in N_Generic_Instantiation
1277 -- Push current compilation unit as scope, so that the test for
1278 -- being within an obsolescent unit will work correctly. The check
1279 -- is not performed within an instantiation, because the warning
1280 -- will have been emitted in the corresponding generic unit.
1282 Push_Scope (Defining_Entity (Unit_Node));
1284 -- Loop through context items to deal with with clauses
1292 Item := First (Context_Items (N));
1293 while Present (Item) loop
1294 if Nkind (Item) = N_With_Clause
1296 -- Suppress this check in limited-withed units. Further work
1297 -- needed here if we decide to incorporate this check on
1298 -- limited-withed units.
1300 and then not Limited_Present (Item)
1303 Ent := Entity (Nam);
1305 if Is_Obsolescent (Ent) then
1306 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1314 -- Remove temporary install of current unit as scope
1318 end Analyze_Compilation_Unit;
1320 ---------------------
1321 -- Analyze_Context --
1322 ---------------------
1324 procedure Analyze_Context (N : Node_Id) is
1325 Ukind : constant Node_Kind := Nkind (Unit (N));
1329 -- First process all configuration pragmas at the start of the context
1330 -- items. Strictly these are not part of the context clause, but that
1331 -- is where the parser puts them. In any case for sure we must analyze
1332 -- these before analyzing the actual context items, since they can have
1333 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1334 -- be with'ed as a result of changing categorizations in Ada 2005).
1336 Item := First (Context_Items (N));
1337 while Present (Item)
1338 and then Nkind (Item) = N_Pragma
1339 and then Pragma_Name (Item) in Configuration_Pragma_Names
1345 -- This is the point at which we capture the configuration settings
1346 -- for the unit. At the moment only the Optimize_Alignment setting
1347 -- needs to be captured. Probably more later ???
1349 if Optimize_Alignment_Local then
1350 Set_OA_Setting (Current_Sem_Unit, 'L');
1352 Set_OA_Setting (Current_Sem_Unit, Optimize_Alignment);
1355 -- Loop through actual context items. This is done in two passes:
1357 -- a) The first pass analyzes non-limited with-clauses and also any
1358 -- configuration pragmas (we need to get the latter analyzed right
1359 -- away, since they can affect processing of subsequent items.
1361 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1363 while Present (Item) loop
1365 -- For with clause, analyze the with clause, and then update the
1366 -- version, since we are dependent on a unit that we with.
1368 if Nkind (Item) = N_With_Clause
1369 and then not Limited_Present (Item)
1371 -- Skip analyzing with clause if no unit, nothing to do (this
1372 -- happens for a with that references a non-existent unit). Skip
1373 -- as well if this is a with_clause for the main unit, which
1374 -- happens if a subunit has a useless with_clause on its parent.
1376 if Present (Library_Unit (Item)) then
1377 if Library_Unit (Item) /= Cunit (Current_Sem_Unit) then
1381 Set_Entity (Name (Item), Cunit_Entity (Current_Sem_Unit));
1385 if not Implicit_With (Item) then
1386 Version_Update (N, Library_Unit (Item));
1389 -- Skip pragmas. Configuration pragmas at the start were handled in
1390 -- the loop above, and remaining pragmas are not processed until we
1391 -- actually install the context (see Install_Context). We delay the
1392 -- analysis of these pragmas to make sure that we have installed all
1393 -- the implicit with's on parent units.
1395 -- Skip use clauses at this stage, since we don't want to do any
1396 -- installing of potentially use-visible entities until we
1397 -- actually install the complete context (in Install_Context).
1398 -- Otherwise things can get installed in the wrong context.
1407 -- Second pass: examine all limited_with clauses. All other context
1408 -- items are ignored in this pass.
1410 Item := First (Context_Items (N));
1411 while Present (Item) loop
1412 if Nkind (Item) = N_With_Clause
1413 and then Limited_Present (Item)
1415 -- No need to check errors on implicitly generated limited-with
1418 if not Implicit_With (Item) then
1420 -- Verify that the illegal contexts given in 10.1.2 (18/2) are
1421 -- properly rejected, including renaming declarations.
1423 if not Nkind_In (Ukind, N_Package_Declaration,
1424 N_Subprogram_Declaration)
1425 and then Ukind not in N_Generic_Declaration
1426 and then Ukind not in N_Generic_Instantiation
1428 Error_Msg_N ("limited with_clause not allowed here", Item);
1430 -- Check wrong use of a limited with clause applied to the
1431 -- compilation unit containing the limited-with clause.
1433 -- limited with P.Q;
1434 -- package P.Q is ...
1436 elsif Unit (Library_Unit (Item)) = Unit (N) then
1437 Error_Msg_N ("wrong use of limited-with clause", Item);
1439 -- Check wrong use of limited-with clause applied to some
1440 -- immediate ancestor.
1442 elsif Is_Child_Spec (Unit (N)) then
1444 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1448 P := Parent_Spec (Unit (N));
1450 if Unit (P) = Lib_U then
1451 Error_Msg_N ("limited with_clause cannot "
1452 & "name ancestor", Item);
1456 exit when not Is_Child_Spec (Unit (P));
1457 P := Parent_Spec (Unit (P));
1462 -- Check if the limited-withed unit is already visible through
1463 -- some context clause of the current compilation unit or some
1464 -- ancestor of the current compilation unit.
1467 Lim_Unit_Name : constant Node_Id := Name (Item);
1468 Comp_Unit : Node_Id;
1470 Unit_Name : Node_Id;
1475 It := First (Context_Items (Comp_Unit));
1476 while Present (It) loop
1478 and then Nkind (It) = N_With_Clause
1479 and then not Limited_Present (It)
1481 Nkind_In (Unit (Library_Unit (It)),
1482 N_Package_Declaration,
1483 N_Package_Renaming_Declaration)
1485 if Nkind (Unit (Library_Unit (It))) =
1486 N_Package_Declaration
1488 Unit_Name := Name (It);
1490 Unit_Name := Name (Unit (Library_Unit (It)));
1493 -- Check if the named package (or some ancestor)
1494 -- leaves visible the full-view of the unit given
1495 -- in the limited-with clause
1498 if Designate_Same_Unit (Lim_Unit_Name,
1501 Error_Msg_Sloc := Sloc (It);
1503 ("simultaneous visibility of limited "
1504 & "and unlimited views not allowed",
1507 ("\unlimited view visible through "
1508 & "context clause #",
1512 elsif Nkind (Unit_Name) = N_Identifier then
1516 Unit_Name := Prefix (Unit_Name);
1523 exit when not Is_Child_Spec (Unit (Comp_Unit));
1525 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1530 -- Skip analyzing with clause if no unit, see above
1532 if Present (Library_Unit (Item)) then
1536 -- A limited_with does not impose an elaboration order, but
1537 -- there is a semantic dependency for recompilation purposes.
1539 if not Implicit_With (Item) then
1540 Version_Update (N, Library_Unit (Item));
1543 -- Pragmas and use clauses and with clauses other than limited
1544 -- with's are ignored in this pass through the context items.
1552 end Analyze_Context;
1554 -------------------------------
1555 -- Analyze_Package_Body_Stub --
1556 -------------------------------
1558 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1559 Id : constant Entity_Id := Defining_Identifier (N);
1563 -- The package declaration must be in the current declarative part
1565 Check_Stub_Level (N);
1566 Nam := Current_Entity_In_Scope (Id);
1568 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1569 Error_Msg_N ("missing specification for package stub", N);
1571 elsif Has_Completion (Nam)
1572 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1574 Error_Msg_N ("duplicate or redundant stub for package", N);
1577 -- Indicate that the body of the package exists. If we are doing
1578 -- only semantic analysis, the stub stands for the body. If we are
1579 -- generating code, the existence of the body will be confirmed
1580 -- when we load the proper body.
1582 Set_Has_Completion (Nam);
1583 Set_Scope (Defining_Entity (N), Current_Scope);
1584 Generate_Reference (Nam, Id, 'b');
1585 Analyze_Proper_Body (N, Nam);
1587 end Analyze_Package_Body_Stub;
1589 -------------------------
1590 -- Analyze_Proper_Body --
1591 -------------------------
1593 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1594 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1595 Unum : Unit_Number_Type;
1597 procedure Optional_Subunit;
1598 -- This procedure is called when the main unit is a stub, or when we
1599 -- are not generating code. In such a case, we analyze the subunit if
1600 -- present, which is user-friendly and in fact required for ASIS, but
1601 -- we don't complain if the subunit is missing.
1603 ----------------------
1604 -- Optional_Subunit --
1605 ----------------------
1607 procedure Optional_Subunit is
1608 Comp_Unit : Node_Id;
1611 -- Try to load subunit, but ignore any errors that occur during the
1612 -- loading of the subunit, by using the special feature in Errout to
1613 -- ignore all errors. Note that Fatal_Error will still be set, so we
1614 -- will be able to check for this case below.
1616 if not ASIS_Mode then
1617 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1622 (Load_Name => Subunit_Name,
1627 if not ASIS_Mode then
1628 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1631 -- All done if we successfully loaded the subunit
1634 and then (not Fatal_Error (Unum) or else Try_Semantics)
1636 Comp_Unit := Cunit (Unum);
1638 -- If the file was empty or seriously mangled, the unit itself may
1641 if No (Unit (Comp_Unit)) then
1643 ("subunit does not contain expected proper body", N);
1645 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1647 ("expected SEPARATE subunit, found child unit",
1648 Cunit_Entity (Unum));
1650 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1651 Analyze_Subunit (Comp_Unit);
1652 Set_Library_Unit (N, Comp_Unit);
1655 elsif Unum = No_Unit
1656 and then Present (Nam)
1658 if Is_Protected_Type (Nam) then
1659 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1661 Set_Corresponding_Body (
1662 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1665 end Optional_Subunit;
1667 -- Start of processing for Analyze_Proper_Body
1670 -- If the subunit is already loaded, it means that the main unit is a
1671 -- subunit, and that the current unit is one of its parents which was
1672 -- being analyzed to provide the needed context for the analysis of the
1673 -- subunit. In this case we analyze the subunit and continue with the
1674 -- parent, without looking at subsequent subunits.
1676 if Is_Loaded (Subunit_Name) then
1678 -- If the proper body is already linked to the stub node, the stub is
1679 -- in a generic unit and just needs analyzing.
1681 if Present (Library_Unit (N)) then
1682 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1684 -- If the subunit has severe errors, the spec of the enclosing
1685 -- body may not be available, in which case do not try analysis.
1687 if Serious_Errors_Detected > 0
1688 and then No (Library_Unit (Library_Unit (N)))
1693 Analyze_Subunit (Library_Unit (N));
1695 -- Otherwise we must load the subunit and link to it
1698 -- Load the subunit, this must work, since we originally loaded
1699 -- the subunit earlier on. So this will not really load it, just
1700 -- give access to it.
1704 (Load_Name => Subunit_Name,
1709 -- And analyze the subunit in the parent context (note that we
1710 -- do not call Semantics, since that would remove the parent
1711 -- context). Because of this, we have to manually reset the
1712 -- compiler state to Analyzing since it got destroyed by Load.
1714 if Unum /= No_Unit then
1715 Compiler_State := Analyzing;
1717 -- Check that the proper body is a subunit and not a child
1718 -- unit. If the unit was previously loaded, the error will
1719 -- have been emitted when copying the generic node, so we
1720 -- just return to avoid cascaded errors.
1722 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1726 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1727 Analyze_Subunit (Cunit (Unum));
1728 Set_Library_Unit (N, Cunit (Unum));
1732 -- If the main unit is a subunit, then we are just performing semantic
1733 -- analysis on that subunit, and any other subunits of any parent unit
1734 -- should be ignored, except that if we are building trees for ASIS
1735 -- usage we want to annotate the stub properly.
1737 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1738 and then Subunit_Name /= Unit_Name (Main_Unit)
1744 -- But before we return, set the flag for unloaded subunits. This
1745 -- will suppress junk warnings of variables in the same declarative
1746 -- part (or a higher level one) that are in danger of looking unused
1747 -- when in fact there might be a declaration in the subunit that we
1748 -- do not intend to load.
1750 Unloaded_Subunits := True;
1753 -- If the subunit is not already loaded, and we are generating code,
1754 -- then this is the case where compilation started from the parent, and
1755 -- we are generating code for an entire subunit tree. In that case we
1756 -- definitely need to load the subunit.
1758 -- In order to continue the analysis with the rest of the parent,
1759 -- and other subunits, we load the unit without requiring its
1760 -- presence, and emit a warning if not found, rather than terminating
1761 -- the compilation abruptly, as for other missing file problems.
1763 elsif Original_Operating_Mode = Generate_Code then
1765 -- If the proper body is already linked to the stub node, the stub is
1766 -- in a generic unit and just needs analyzing.
1768 -- We update the version. Although we are not strictly technically
1769 -- semantically dependent on the subunit, given our approach of macro
1770 -- substitution of subunits, it makes sense to include it in the
1771 -- version identification.
1773 if Present (Library_Unit (N)) then
1774 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1775 Analyze_Subunit (Library_Unit (N));
1776 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1778 -- Otherwise we must load the subunit and link to it
1781 -- Make sure that, if the subunit is preprocessed and -gnateG is
1782 -- specified, the preprocessed file will be written.
1784 Lib.Analysing_Subunit_Of_Main := True;
1787 (Load_Name => Subunit_Name,
1791 Lib.Analysing_Subunit_Of_Main := False;
1793 -- Give message if we did not get the unit Emit warning even if
1794 -- missing subunit is not within main unit, to simplify debugging.
1796 if Original_Operating_Mode = Generate_Code
1797 and then Unum = No_Unit
1799 Error_Msg_Unit_1 := Subunit_Name;
1801 Get_File_Name (Subunit_Name, Subunit => True);
1803 ("subunit$$ in file{ not found??!!", N);
1804 Subunits_Missing := True;
1807 -- Load_Unit may reset Compiler_State, since it may have been
1808 -- necessary to parse an additional units, so we make sure that
1809 -- we reset it to the Analyzing state.
1811 Compiler_State := Analyzing;
1813 if Unum /= No_Unit then
1814 if Debug_Flag_L then
1815 Write_Str ("*** Loaded subunit from stub. Analyze");
1820 Comp_Unit : constant Node_Id := Cunit (Unum);
1823 -- Check for child unit instead of subunit
1825 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1827 ("expected SEPARATE subunit, found child unit",
1828 Cunit_Entity (Unum));
1830 -- OK, we have a subunit
1833 -- Set corresponding stub (even if errors)
1835 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1837 -- Collect SCO information for loaded subunit if we are
1838 -- in the main unit.
1842 In_Extended_Main_Source_Unit
1843 (Cunit_Entity (Current_Sem_Unit))
1848 -- Analyze the unit if semantics active
1850 if not Fatal_Error (Unum) or else Try_Semantics then
1851 Analyze_Subunit (Comp_Unit);
1854 -- Set the library unit pointer in any case
1856 Set_Library_Unit (N, Comp_Unit);
1858 -- We update the version. Although we are not technically
1859 -- semantically dependent on the subunit, given our
1860 -- approach of macro substitution of subunits, it makes
1861 -- sense to include it in the version identification.
1863 Version_Update (Cunit (Main_Unit), Comp_Unit);
1869 -- The remaining case is when the subunit is not already loaded and we
1870 -- are not generating code. In this case we are just performing semantic
1871 -- analysis on the parent, and we are not interested in the subunit. For
1872 -- subprograms, analyze the stub as a body. For other entities the stub
1873 -- has already been marked as completed.
1878 end Analyze_Proper_Body;
1880 ----------------------------------
1881 -- Analyze_Protected_Body_Stub --
1882 ----------------------------------
1884 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1885 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1888 Check_Stub_Level (N);
1890 -- First occurrence of name may have been as an incomplete type
1892 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1893 Nam := Full_View (Nam);
1897 or else not Is_Protected_Type (Etype (Nam))
1899 Error_Msg_N ("missing specification for Protected body", N);
1901 Set_Scope (Defining_Entity (N), Current_Scope);
1902 Set_Has_Completion (Etype (Nam));
1903 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1904 Analyze_Proper_Body (N, Etype (Nam));
1906 end Analyze_Protected_Body_Stub;
1908 ----------------------------------
1909 -- Analyze_Subprogram_Body_Stub --
1910 ----------------------------------
1912 -- A subprogram body stub can appear with or without a previous spec. If
1913 -- there is one, then the analysis of the body will find it and verify
1914 -- conformance. The formals appearing in the specification of the stub play
1915 -- no role, except for requiring an additional conformance check. If there
1916 -- is no previous subprogram declaration, the stub acts as a spec, and
1917 -- provides the defining entity for the subprogram.
1919 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1923 Check_Stub_Level (N);
1925 -- Verify that the identifier for the stub is unique within this
1926 -- declarative part.
1928 if Nkind_In (Parent (N), N_Block_Statement,
1932 Decl := First (Declarations (Parent (N)));
1933 while Present (Decl)
1936 if Nkind (Decl) = N_Subprogram_Body_Stub
1937 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1938 Chars (Defining_Unit_Name (Specification (N))))
1940 Error_Msg_N ("identifier for stub is not unique", N);
1947 -- Treat stub as a body, which checks conformance if there is a previous
1948 -- declaration, or else introduces entity and its signature.
1950 Analyze_Subprogram_Body (N);
1951 Analyze_Proper_Body (N, Empty);
1952 end Analyze_Subprogram_Body_Stub;
1954 ---------------------
1955 -- Analyze_Subunit --
1956 ---------------------
1958 -- A subunit is compiled either by itself (for semantic checking) or as
1959 -- part of compiling the parent (for code generation). In either case, by
1960 -- the time we actually process the subunit, the parent has already been
1961 -- installed and analyzed. The node N is a compilation unit, whose context
1962 -- needs to be treated here, because we come directly here from the parent
1963 -- without calling Analyze_Compilation_Unit.
1965 -- The compilation context includes the explicit context of the subunit,
1966 -- and the context of the parent, together with the parent itself. In order
1967 -- to compile the current context, we remove the one inherited from the
1968 -- parent, in order to have a clean visibility table. We restore the parent
1969 -- context before analyzing the proper body itself. On exit, we remove only
1970 -- the explicit context of the subunit.
1972 procedure Analyze_Subunit (N : Node_Id) is
1973 Lib_Unit : constant Node_Id := Library_Unit (N);
1974 Par_Unit : constant Entity_Id := Current_Scope;
1976 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1977 Num_Scopes : Int := 0;
1978 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1979 Enclosing_Child : Entity_Id := Empty;
1980 Svg : constant Suppress_Record := Scope_Suppress;
1982 Save_Cunit_Restrictions : constant Save_Cunit_Boolean_Restrictions :=
1983 Cunit_Boolean_Restrictions_Save;
1984 -- Save non-partition wide restrictions before processing the subunit.
1985 -- All subunits are analyzed with config restrictions reset and we need
1986 -- to restore these saved values at the end.
1988 procedure Analyze_Subunit_Context;
1989 -- Capture names in use clauses of the subunit. This must be done before
1990 -- re-installing parent declarations, because items in the context must
1991 -- not be hidden by declarations local to the parent.
1993 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1994 -- Recursive procedure to restore scope of all ancestors of subunit,
1995 -- from outermost in. If parent is not a subunit, the call to install
1996 -- context installs context of spec and (if parent is a child unit) the
1997 -- context of its parents as well. It is confusing that parents should
1998 -- be treated differently in both cases, but the semantics are just not
2001 procedure Re_Install_Use_Clauses;
2002 -- As part of the removal of the parent scope, the use clauses are
2003 -- removed, to be reinstalled when the context of the subunit has been
2004 -- analyzed. Use clauses may also have been affected by the analysis of
2005 -- the context of the subunit, so they have to be applied again, to
2006 -- insure that the compilation environment of the rest of the parent
2007 -- unit is identical.
2009 procedure Remove_Scope;
2010 -- Remove current scope from scope stack, and preserve the list of use
2011 -- clauses in it, to be reinstalled after context is analyzed.
2013 -----------------------------
2014 -- Analyze_Subunit_Context --
2015 -----------------------------
2017 procedure Analyze_Subunit_Context is
2020 Unit_Name : Entity_Id;
2023 Analyze_Context (N);
2025 -- Make withed units immediately visible. If child unit, make the
2026 -- ultimate parent immediately visible.
2028 Item := First (Context_Items (N));
2029 while Present (Item) loop
2030 if Nkind (Item) = N_With_Clause then
2032 -- Protect frontend against previous errors in context clauses
2034 if Nkind (Name (Item)) /= N_Selected_Component then
2035 if Error_Posted (Item) then
2039 -- If a subunits has serious syntax errors, the context
2040 -- may not have been loaded. Add a harmless unit name to
2041 -- attempt processing.
2043 if Serious_Errors_Detected > 0
2044 and then No (Entity (Name (Item)))
2046 Set_Entity (Name (Item), Standard_Standard);
2049 Unit_Name := Entity (Name (Item));
2051 Set_Is_Visible_Lib_Unit (Unit_Name);
2052 exit when Scope (Unit_Name) = Standard_Standard;
2053 Unit_Name := Scope (Unit_Name);
2055 if No (Unit_Name) then
2056 Check_Error_Detected;
2061 if not Is_Immediately_Visible (Unit_Name) then
2062 Set_Is_Immediately_Visible (Unit_Name);
2063 Set_Context_Installed (Item);
2068 elsif Nkind (Item) = N_Use_Package_Clause then
2069 Nam := First (Names (Item));
2070 while Present (Nam) loop
2075 elsif Nkind (Item) = N_Use_Type_Clause then
2076 Nam := First (Subtype_Marks (Item));
2077 while Present (Nam) loop
2086 -- Reset visibility of withed units. They will be made visible again
2087 -- when we install the subunit context.
2089 Item := First (Context_Items (N));
2090 while Present (Item) loop
2091 if Nkind (Item) = N_With_Clause
2093 -- Protect frontend against previous errors in context clauses
2095 and then Nkind (Name (Item)) /= N_Selected_Component
2096 and then not Error_Posted (Item)
2098 Unit_Name := Entity (Name (Item));
2100 Set_Is_Visible_Lib_Unit (Unit_Name, False);
2101 exit when Scope (Unit_Name) = Standard_Standard;
2102 Unit_Name := Scope (Unit_Name);
2105 if Context_Installed (Item) then
2106 Set_Is_Immediately_Visible (Unit_Name, False);
2107 Set_Context_Installed (Item, False);
2113 end Analyze_Subunit_Context;
2115 ------------------------
2116 -- Re_Install_Parents --
2117 ------------------------
2119 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
2123 if Nkind (Unit (L)) = N_Subunit then
2124 Re_Install_Parents (Library_Unit (L), Scope (Scop));
2127 Install_Context (L);
2129 -- If the subunit occurs within a child unit, we must restore the
2130 -- immediate visibility of any siblings that may occur in context.
2132 if Present (Enclosing_Child) then
2133 Install_Siblings (Enclosing_Child, L);
2138 if Scop /= Par_Unit then
2139 Set_Is_Immediately_Visible (Scop);
2142 -- Make entities in scope visible again. For child units, restore
2143 -- visibility only if they are actually in context.
2145 E := First_Entity (Current_Scope);
2146 while Present (E) loop
2147 if not Is_Child_Unit (E)
2148 or else Is_Visible_Lib_Unit (E)
2150 Set_Is_Immediately_Visible (E);
2156 -- A subunit appears within a body, and for a nested subunits all the
2157 -- parents are bodies. Restore full visibility of their private
2160 if Is_Package_Or_Generic_Package (Scop) then
2161 Set_In_Package_Body (Scop);
2162 Install_Private_Declarations (Scop);
2164 end Re_Install_Parents;
2166 ----------------------------
2167 -- Re_Install_Use_Clauses --
2168 ----------------------------
2170 procedure Re_Install_Use_Clauses is
2173 for J in reverse 1 .. Num_Scopes loop
2174 U := Use_Clauses (J);
2175 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2176 Install_Use_Clauses (U, Force_Installation => True);
2178 end Re_Install_Use_Clauses;
2184 procedure Remove_Scope is
2188 Num_Scopes := Num_Scopes + 1;
2189 Use_Clauses (Num_Scopes) :=
2190 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2192 E := First_Entity (Current_Scope);
2193 while Present (E) loop
2194 Set_Is_Immediately_Visible (E, False);
2198 if Is_Child_Unit (Current_Scope) then
2199 Enclosing_Child := Current_Scope;
2205 -- Start of processing for Analyze_Subunit
2208 -- For subunit in main extended unit, we reset the configuration values
2209 -- for the non-partition-wide restrictions. For other units reset them.
2211 if In_Extended_Main_Source_Unit (N) then
2212 Restore_Config_Cunit_Boolean_Restrictions;
2214 Reset_Cunit_Boolean_Restrictions;
2219 Nam : Node_Id := Name (Unit (N));
2222 if Nkind (Nam) = N_Selected_Component then
2223 Nam := Selector_Name (Nam);
2226 Check_Identifier (Nam, Par_Unit);
2230 if not Is_Empty_List (Context_Items (N)) then
2232 -- Save current use clauses
2235 Remove_Context (Lib_Unit);
2237 -- Now remove parents and their context, including enclosing subunits
2238 -- and the outer parent body which is not a subunit.
2240 if Present (Lib_Spec) then
2241 Remove_Context (Lib_Spec);
2243 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2244 Lib_Spec := Library_Unit (Lib_Spec);
2246 Remove_Context (Lib_Spec);
2249 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2253 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2254 Remove_Context (Library_Unit (Lib_Spec));
2258 Set_Is_Immediately_Visible (Par_Unit, False);
2260 Analyze_Subunit_Context;
2262 Re_Install_Parents (Lib_Unit, Par_Unit);
2263 Set_Is_Immediately_Visible (Par_Unit);
2265 -- If the context includes a child unit of the parent of the subunit,
2266 -- the parent will have been removed from visibility, after compiling
2267 -- that cousin in the context. The visibility of the parent must be
2268 -- restored now. This also applies if the context includes another
2269 -- subunit of the same parent which in turn includes a child unit in
2272 if Is_Package_Or_Generic_Package (Par_Unit) then
2273 if not Is_Immediately_Visible (Par_Unit)
2274 or else (Present (First_Entity (Par_Unit))
2275 and then not Is_Immediately_Visible
2276 (First_Entity (Par_Unit)))
2278 Set_Is_Immediately_Visible (Par_Unit);
2279 Install_Visible_Declarations (Par_Unit);
2280 Install_Private_Declarations (Par_Unit);
2284 Re_Install_Use_Clauses;
2285 Install_Context (N);
2287 -- Restore state of suppress flags for current body
2289 Scope_Suppress := Svg;
2291 -- If the subunit is within a child unit, then siblings of any parent
2292 -- unit that appear in the context clause of the subunit must also be
2293 -- made immediately visible.
2295 if Present (Enclosing_Child) then
2296 Install_Siblings (Enclosing_Child, N);
2300 Analyze (Proper_Body (Unit (N)));
2303 -- The subunit may contain a with_clause on a sibling of some ancestor.
2304 -- Removing the context will remove from visibility those ancestor child
2305 -- units, which must be restored to the visibility they have in the
2308 if Present (Enclosing_Child) then
2313 while Present (C) and then C /= Standard_Standard loop
2314 Set_Is_Immediately_Visible (C);
2315 Set_Is_Visible_Lib_Unit (C);
2321 -- Deal with restore of restrictions
2323 Cunit_Boolean_Restrictions_Restore (Save_Cunit_Restrictions);
2324 end Analyze_Subunit;
2326 ----------------------------
2327 -- Analyze_Task_Body_Stub --
2328 ----------------------------
2330 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2331 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2332 Loc : constant Source_Ptr := Sloc (N);
2335 Check_Stub_Level (N);
2337 -- First occurrence of name may have been as an incomplete type
2339 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2340 Nam := Full_View (Nam);
2343 if No (Nam) or else not Is_Task_Type (Etype (Nam)) then
2344 Error_Msg_N ("missing specification for task body", N);
2346 Set_Scope (Defining_Entity (N), Current_Scope);
2347 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2349 -- Check for duplicate stub, if so give message and terminate
2351 if Has_Completion (Etype (Nam)) then
2352 Error_Msg_N ("duplicate stub for task", N);
2355 Set_Has_Completion (Etype (Nam));
2358 Analyze_Proper_Body (N, Etype (Nam));
2360 -- Set elaboration flag to indicate that entity is callable. This
2361 -- cannot be done in the expansion of the body itself, because the
2362 -- proper body is not in a declarative part. This is only done if
2363 -- expansion is active, because the context may be generic and the
2364 -- flag not defined yet.
2366 if Full_Expander_Active then
2368 Make_Assignment_Statement (Loc,
2370 Make_Identifier (Loc,
2371 Chars => New_External_Name (Chars (Etype (Nam)), 'E')),
2372 Expression => New_Reference_To (Standard_True, Loc)));
2375 end Analyze_Task_Body_Stub;
2377 -------------------------
2378 -- Analyze_With_Clause --
2379 -------------------------
2381 -- Analyze the declaration of a unit in a with clause. At end, label the
2382 -- with clause with the defining entity for the unit.
2384 procedure Analyze_With_Clause (N : Node_Id) is
2386 -- Retrieve the original kind of the unit node, before analysis. If it
2387 -- is a subprogram instantiation, its analysis below will rewrite the
2388 -- node as the declaration of the wrapper package. If the same
2389 -- instantiation appears indirectly elsewhere in the context, it will
2390 -- have been analyzed already.
2392 Unit_Kind : constant Node_Kind :=
2393 Nkind (Original_Node (Unit (Library_Unit (N))));
2394 Nam : constant Node_Id := Name (N);
2396 Par_Name : Entity_Id;
2401 -- Set True if the unit currently being compiled is an internal unit
2403 Restriction_Violation : Boolean := False;
2404 -- Set True if a with violates a restriction, no point in giving any
2405 -- warnings if we have this definite error.
2407 Save_Style_Check : constant Boolean := Opt.Style_Check;
2410 U := Unit (Library_Unit (N));
2412 -- If this is an internal unit which is a renaming, then this is a
2413 -- violation of No_Obsolescent_Features.
2415 -- Note: this is not quite right if the user defines one of these units
2416 -- himself, but that's a marginal case, and fixing it is hard ???
2418 if Restriction_Check_Required (No_Obsolescent_Features) then
2420 F : constant File_Name_Type :=
2421 Unit_File_Name (Get_Source_Unit (U));
2423 if Is_Predefined_File_Name (F, Renamings_Included => True)
2425 Is_Predefined_File_Name (F, Renamings_Included => False)
2427 Check_Restriction (No_Obsolescent_Features, N);
2428 Restriction_Violation := True;
2433 -- Check No_Implementation_Units violation
2435 if Restriction_Check_Required (No_Implementation_Units) then
2436 if Not_Impl_Defined_Unit (Get_Source_Unit (U)) then
2439 Check_Restriction (No_Implementation_Units, Nam);
2440 Restriction_Violation := True;
2444 -- Several actions are skipped for dummy packages (those supplied for
2445 -- with's where no matching file could be found). Such packages are
2446 -- identified by the Sloc value being set to No_Location.
2448 if Limited_Present (N) then
2450 -- Ada 2005 (AI-50217): Build visibility structures but do not
2451 -- analyze the unit.
2453 if Sloc (U) /= No_Location then
2454 Build_Limited_Views (N);
2460 -- We reset ordinary style checking during the analysis of a with'ed
2461 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2462 -- definitely *does* apply to with'ed units).
2464 if not GNAT_Mode then
2465 Style_Check := False;
2468 -- If the library unit is a predefined unit, and we are in high
2469 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2470 -- for the analysis of the with'ed unit. This mode does not prevent
2471 -- explicit with'ing of run-time units.
2473 if Configurable_Run_Time_Mode
2474 and then Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (U)))
2476 Configurable_Run_Time_Mode := False;
2477 Semantics (Library_Unit (N));
2478 Configurable_Run_Time_Mode := True;
2481 Semantics (Library_Unit (N));
2484 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2486 if Sloc (U) /= No_Location then
2488 -- Check restrictions, except that we skip the check if this is an
2489 -- internal unit unless we are compiling the internal unit as the
2490 -- main unit. We also skip this for dummy packages.
2492 Check_Restriction_No_Dependence (Nam, N);
2494 if not Intunit or else Current_Sem_Unit = Main_Unit then
2495 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2498 -- Deal with special case of GNAT.Current_Exceptions which interacts
2499 -- with the optimization of local raise statements into gotos.
2501 if Nkind (Nam) = N_Selected_Component
2502 and then Nkind (Prefix (Nam)) = N_Identifier
2503 and then Chars (Prefix (Nam)) = Name_Gnat
2504 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2506 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2508 Check_Restriction (No_Exception_Propagation, N);
2509 Special_Exception_Package_Used := True;
2512 -- Check for inappropriate with of internal implementation unit if we
2513 -- are not compiling an internal unit and also check for withing unit
2514 -- in wrong version of Ada. Do not issue these messages for implicit
2515 -- with's generated by the compiler itself.
2517 if Implementation_Unit_Warnings
2518 and then not Intunit
2519 and then not Implicit_With (N)
2520 and then not Restriction_Violation
2523 U_Kind : constant Kind_Of_Unit :=
2524 Get_Kind_Of_Unit (Get_Source_Unit (U));
2527 if U_Kind = Implementation_Unit then
2528 Error_Msg_F ("& is an internal 'G'N'A'T unit?i?", Name (N));
2530 -- Add alternative name if available, otherwise issue a
2531 -- general warning message.
2533 if Error_Msg_Strlen /= 0 then
2534 Error_Msg_F ("\use ""~"" instead?i?", Name (N));
2537 ("\use of this unit is non-portable " &
2538 "and version-dependent?i?", Name (N));
2541 elsif U_Kind = Ada_2005_Unit
2542 and then Ada_Version < Ada_2005
2543 and then Warn_On_Ada_2005_Compatibility
2545 Error_Msg_N ("& is an Ada 2005 unit?i?", Name (N));
2547 elsif U_Kind = Ada_2012_Unit
2548 and then Ada_Version < Ada_2012
2549 and then Warn_On_Ada_2012_Compatibility
2551 Error_Msg_N ("& is an Ada 2012 unit?i?", Name (N));
2557 -- Semantic analysis of a generic unit is performed on a copy of
2558 -- the original tree. Retrieve the entity on which semantic info
2559 -- actually appears.
2561 if Unit_Kind in N_Generic_Declaration then
2562 E_Name := Defining_Entity (U);
2564 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2565 -- the case of an instantiation, semantic analysis above will have
2566 -- replaced the unit by its instantiated version. If the instance body
2567 -- has been generated, the instance now denotes the body entity. For
2568 -- visibility purposes we need the entity of its spec.
2570 elsif (Unit_Kind = N_Package_Instantiation
2571 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2572 N_Package_Instantiation)
2573 and then Nkind (U) = N_Package_Body
2575 E_Name := Corresponding_Spec (U);
2577 elsif Unit_Kind = N_Package_Instantiation
2578 and then Nkind (U) = N_Package_Instantiation
2579 and then Present (Instance_Spec (U))
2581 -- If the instance has not been rewritten as a package declaration,
2582 -- then it appeared already in a previous with clause. Retrieve
2583 -- the entity from the previous instance.
2585 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2587 elsif Unit_Kind in N_Subprogram_Instantiation then
2589 -- The visible subprogram is created during instantiation, and is
2590 -- an attribute of the wrapper package. We retrieve the wrapper
2591 -- package directly from the instantiation node. If the instance
2592 -- is inlined the unit is still an instantiation. Otherwise it has
2593 -- been rewritten as the declaration of the wrapper itself.
2595 if Nkind (U) in N_Subprogram_Instantiation then
2598 (Defining_Entity (Specification (Instance_Spec (U))));
2600 E_Name := Related_Instance (Defining_Entity (U));
2603 elsif Unit_Kind = N_Package_Renaming_Declaration
2604 or else Unit_Kind in N_Generic_Renaming_Declaration
2606 E_Name := Defining_Entity (U);
2608 elsif Unit_Kind = N_Subprogram_Body
2609 and then Nkind (Name (N)) = N_Selected_Component
2610 and then not Acts_As_Spec (Library_Unit (N))
2612 -- For a child unit that has no spec, one has been created and
2613 -- analyzed. The entity required is that of the spec.
2615 E_Name := Corresponding_Spec (U);
2618 E_Name := Defining_Entity (U);
2621 if Nkind (Name (N)) = N_Selected_Component then
2623 -- Child unit in a with clause
2625 Change_Selected_Component_To_Expanded_Name (Name (N));
2627 -- If this is a child unit without a spec, and it has been analyzed
2628 -- already, a declaration has been created for it. The with_clause
2629 -- must reflect the actual body, and not the generated declaration,
2630 -- to prevent spurious binding errors involving an out-of-date spec.
2631 -- Note that this can only happen if the unit includes more than one
2632 -- with_clause for the child unit (e.g. in separate subunits).
2634 if Unit_Kind = N_Subprogram_Declaration
2635 and then Analyzed (Library_Unit (N))
2636 and then not Comes_From_Source (Library_Unit (N))
2638 Set_Library_Unit (N,
2639 Cunit (Get_Source_Unit (Corresponding_Body (U))));
2643 -- Restore style checks
2645 Style_Check := Save_Style_Check;
2647 -- Record the reference, but do NOT set the unit as referenced, we want
2648 -- to consider the unit as unreferenced if this is the only reference
2651 Set_Entity_With_Style_Check (Name (N), E_Name);
2652 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2654 -- Generate references and check No_Dependence restriction for parents
2656 if Is_Child_Unit (E_Name) then
2657 Pref := Prefix (Name (N));
2658 Par_Name := Scope (E_Name);
2659 while Nkind (Pref) = N_Selected_Component loop
2660 Change_Selected_Component_To_Expanded_Name (Pref);
2662 if Present (Entity (Selector_Name (Pref)))
2664 Present (Renamed_Entity (Entity (Selector_Name (Pref))))
2665 and then Entity (Selector_Name (Pref)) /= Par_Name
2667 -- The prefix is a child unit that denotes a renaming declaration.
2668 -- Replace the prefix directly with the renamed unit, because the
2669 -- rest of the prefix is irrelevant to the visibility of the real
2672 Rewrite (Pref, New_Occurrence_Of (Par_Name, Sloc (Pref)));
2676 Set_Entity_With_Style_Check (Pref, Par_Name);
2678 Generate_Reference (Par_Name, Pref);
2679 Check_Restriction_No_Dependence (Pref, N);
2680 Pref := Prefix (Pref);
2682 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2683 -- is set to Standard_Standard, and no attempt should be made to
2684 -- further unwind scopes.
2686 if Par_Name /= Standard_Standard then
2687 Par_Name := Scope (Par_Name);
2690 -- Abandon processing in case of previous errors
2692 if No (Par_Name) then
2693 Check_Error_Detected;
2698 if Present (Entity (Pref))
2699 and then not Analyzed (Parent (Parent (Entity (Pref))))
2701 -- If the entity is set without its unit being compiled, the
2702 -- original parent is a renaming, and Par_Name is the renamed
2703 -- entity. For visibility purposes, we need the original entity,
2704 -- which must be analyzed now because Load_Unit directly retrieves
2705 -- the renamed unit, and the renaming declaration itself has not
2708 Analyze (Parent (Parent (Entity (Pref))));
2709 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2710 Par_Name := Entity (Pref);
2713 -- Guard against missing or misspelled child units
2715 if Present (Par_Name) then
2716 Set_Entity_With_Style_Check (Pref, Par_Name);
2717 Generate_Reference (Par_Name, Pref);
2720 pragma Assert (Serious_Errors_Detected /= 0);
2722 -- Mark the node to indicate that a related error has been posted.
2723 -- This defends further compilation passes against improper use of
2724 -- the invalid WITH clause node.
2726 Set_Error_Posted (N);
2727 Set_Name (N, Error);
2732 -- If the withed unit is System, and a system extension pragma is
2733 -- present, compile the extension now, rather than waiting for a
2734 -- visibility check on a specific entity.
2736 if Chars (E_Name) = Name_System
2737 and then Scope (E_Name) = Standard_Standard
2738 and then Present (System_Extend_Unit)
2739 and then Present_System_Aux (N)
2741 -- If the extension is not present, an error will have been emitted
2746 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2747 -- to private_with units; they will be made visible later (just before
2748 -- the private part is analyzed)
2750 if Private_Present (N) then
2751 Set_Is_Immediately_Visible (E_Name, False);
2753 end Analyze_With_Clause;
2755 ------------------------------
2756 -- Check_Private_Child_Unit --
2757 ------------------------------
2759 procedure Check_Private_Child_Unit (N : Node_Id) is
2760 Lib_Unit : constant Node_Id := Unit (N);
2762 Curr_Unit : Entity_Id;
2763 Sub_Parent : Node_Id;
2764 Priv_Child : Entity_Id;
2765 Par_Lib : Entity_Id;
2768 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2769 -- Returns true if and only if the library unit is declared with
2770 -- an explicit designation of private.
2772 -----------------------------
2773 -- Is_Private_Library_Unit --
2774 -----------------------------
2776 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2777 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2780 return Private_Present (Comp_Unit);
2781 end Is_Private_Library_Unit;
2783 -- Start of processing for Check_Private_Child_Unit
2786 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2787 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2788 Par_Lib := Curr_Unit;
2790 elsif Nkind (Lib_Unit) = N_Subunit then
2792 -- The parent is itself a body. The parent entity is to be found in
2793 -- the corresponding spec.
2795 Sub_Parent := Library_Unit (N);
2796 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2798 -- If the parent itself is a subunit, Curr_Unit is the entity of the
2799 -- enclosing body, retrieve the spec entity which is the proper
2800 -- ancestor we need for the following tests.
2802 if Ekind (Curr_Unit) = E_Package_Body then
2803 Curr_Unit := Spec_Entity (Curr_Unit);
2806 Par_Lib := Curr_Unit;
2809 Curr_Unit := Defining_Entity (Lib_Unit);
2811 Par_Lib := Curr_Unit;
2812 Par_Spec := Parent_Spec (Lib_Unit);
2814 if No (Par_Spec) then
2817 Par_Lib := Defining_Entity (Unit (Par_Spec));
2821 -- Loop through context items
2823 Item := First (Context_Items (N));
2824 while Present (Item) loop
2826 -- Ada 2005 (AI-262): Allow private_with of a private child package
2827 -- in public siblings
2829 if Nkind (Item) = N_With_Clause
2830 and then not Implicit_With (Item)
2831 and then not Limited_Present (Item)
2832 and then Is_Private_Descendant (Entity (Name (Item)))
2834 Priv_Child := Entity (Name (Item));
2837 Curr_Parent : Entity_Id := Par_Lib;
2838 Child_Parent : Entity_Id := Scope (Priv_Child);
2839 Prv_Ancestor : Entity_Id := Child_Parent;
2840 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2843 -- If the child unit is a public child then locate the nearest
2844 -- private ancestor. Child_Parent will then be set to the
2845 -- parent of that ancestor.
2847 if not Is_Private_Library_Unit (Priv_Child) then
2848 while Present (Prv_Ancestor)
2849 and then not Is_Private_Library_Unit (Prv_Ancestor)
2851 Prv_Ancestor := Scope (Prv_Ancestor);
2854 if Present (Prv_Ancestor) then
2855 Child_Parent := Scope (Prv_Ancestor);
2859 while Present (Curr_Parent)
2860 and then Curr_Parent /= Standard_Standard
2861 and then Curr_Parent /= Child_Parent
2864 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2865 Curr_Parent := Scope (Curr_Parent);
2868 if No (Curr_Parent) then
2869 Curr_Parent := Standard_Standard;
2872 if Curr_Parent /= Child_Parent then
2873 if Ekind (Priv_Child) = E_Generic_Package
2874 and then Chars (Priv_Child) in Text_IO_Package_Name
2875 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2878 ("& is a nested package, not a compilation unit",
2879 Name (Item), Priv_Child);
2883 ("unit in with clause is private child unit!", Item);
2885 ("\current unit must also have parent&!",
2886 Item, Child_Parent);
2890 or else Private_Present (Item)
2891 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2892 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2893 and then not Acts_As_Spec (Parent (Lib_Unit)))
2899 ("current unit must also be private descendant of&",
2900 Item, Child_Parent);
2908 end Check_Private_Child_Unit;
2910 ----------------------
2911 -- Check_Stub_Level --
2912 ----------------------
2914 procedure Check_Stub_Level (N : Node_Id) is
2915 Par : constant Node_Id := Parent (N);
2916 Kind : constant Node_Kind := Nkind (Par);
2919 if Nkind_In (Kind, N_Package_Body,
2923 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2927 -- In an instance, a missing stub appears at any level. A warning
2928 -- message will have been emitted already for the missing file.
2930 elsif not In_Instance then
2931 Error_Msg_N ("stub cannot appear in an inner scope", N);
2933 elsif Expander_Active then
2934 Error_Msg_N ("missing proper body", N);
2936 end Check_Stub_Level;
2938 ------------------------
2939 -- Expand_With_Clause --
2940 ------------------------
2942 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2943 Loc : constant Source_Ptr := Sloc (Nam);
2944 Ent : constant Entity_Id := Entity (Nam);
2948 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2949 -- Build name to be used in implicit with_clause. In most cases this
2950 -- is the source name, but if renamings are present we must make the
2951 -- original unit visible, not the one it renames. The entity in the
2952 -- with clause is the renamed unit, but the identifier is the one from
2953 -- the source, which allows us to recover the unit renaming.
2955 ---------------------
2956 -- Build_Unit_Name --
2957 ---------------------
2959 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2964 if Nkind (Nam) = N_Identifier then
2965 return New_Occurrence_Of (Entity (Nam), Loc);
2968 Ent := Entity (Nam);
2970 if Present (Entity (Selector_Name (Nam)))
2971 and then Chars (Entity (Selector_Name (Nam))) /= Chars (Ent)
2973 Nkind (Unit_Declaration_Node (Entity (Selector_Name (Nam))))
2974 = N_Package_Renaming_Declaration
2976 -- The name in the with_clause is of the form A.B.C, and B is
2977 -- given by a renaming declaration. In that case we may not
2978 -- have analyzed the unit for B, but replaced it directly in
2979 -- lib-load with the unit it renames. We have to make A.B
2980 -- visible, so analyze the declaration for B now, in case it
2981 -- has not been done yet.
2983 Ent := Entity (Selector_Name (Nam));
2986 (Unit_Declaration_Node (Entity (Selector_Name (Nam)))));
2990 Make_Expanded_Name (Loc,
2991 Chars => Chars (Entity (Nam)),
2992 Prefix => Build_Unit_Name (Prefix (Nam)),
2993 Selector_Name => New_Occurrence_Of (Ent, Loc));
2994 Set_Entity (Result, Ent);
2997 end Build_Unit_Name;
2999 -- Start of processing for Expand_With_Clause
3003 Make_With_Clause (Loc,
3004 Name => Build_Unit_Name (Nam));
3006 P := Parent (Unit_Declaration_Node (Ent));
3007 Set_Library_Unit (Withn, P);
3008 Set_Corresponding_Spec (Withn, Ent);
3009 Set_First_Name (Withn, True);
3010 Set_Implicit_With (Withn, True);
3012 -- If the unit is a package or generic package declaration, a private_
3013 -- with_clause on a child unit implies that the implicit with on the
3014 -- parent is also private.
3016 if Nkind_In (Unit (N), N_Package_Declaration,
3017 N_Generic_Package_Declaration)
3019 Set_Private_Present (Withn, Private_Present (Item));
3022 Prepend (Withn, Context_Items (N));
3023 Mark_Rewrite_Insertion (Withn);
3024 Install_Withed_Unit (Withn);
3026 if Nkind (Nam) = N_Expanded_Name then
3027 Expand_With_Clause (Item, Prefix (Nam), N);
3029 end Expand_With_Clause;
3031 -----------------------
3032 -- Get_Parent_Entity --
3033 -----------------------
3035 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
3037 if Nkind (Unit) = N_Package_Body
3038 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
3040 return Defining_Entity
3041 (Specification (Instance_Spec (Original_Node (Unit))));
3042 elsif Nkind (Unit) = N_Package_Instantiation then
3043 return Defining_Entity (Specification (Instance_Spec (Unit)));
3045 return Defining_Entity (Unit);
3047 end Get_Parent_Entity;
3049 ---------------------
3050 -- Has_With_Clause --
3051 ---------------------
3053 function Has_With_Clause
3056 Is_Limited : Boolean := False) return Boolean
3060 function Named_Unit (Clause : Node_Id) return Entity_Id;
3061 -- Return the entity for the unit named in a [limited] with clause
3067 function Named_Unit (Clause : Node_Id) return Entity_Id is
3069 if Nkind (Name (Clause)) = N_Selected_Component then
3070 return Entity (Selector_Name (Name (Clause)));
3072 return Entity (Name (Clause));
3076 -- Start of processing for Has_With_Clause
3079 if Present (Context_Items (C_Unit)) then
3080 Item := First (Context_Items (C_Unit));
3081 while Present (Item) loop
3082 if Nkind (Item) = N_With_Clause
3083 and then Limited_Present (Item) = Is_Limited
3084 and then Named_Unit (Item) = Pack
3094 end Has_With_Clause;
3096 -----------------------------
3097 -- Implicit_With_On_Parent --
3098 -----------------------------
3100 procedure Implicit_With_On_Parent
3101 (Child_Unit : Node_Id;
3104 Loc : constant Source_Ptr := Sloc (N);
3105 P : constant Node_Id := Parent_Spec (Child_Unit);
3106 P_Unit : Node_Id := Unit (P);
3107 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
3110 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
3111 -- Build prefix of child unit name. Recurse if needed
3113 function Build_Unit_Name return Node_Id;
3114 -- If the unit is a child unit, build qualified name with all ancestors
3116 -------------------------
3117 -- Build_Ancestor_Name --
3118 -------------------------
3120 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
3121 P_Ref : constant Node_Id :=
3122 New_Reference_To (Defining_Entity (P), Loc);
3123 P_Spec : Node_Id := P;
3126 -- Ancestor may have been rewritten as a package body. Retrieve
3127 -- the original spec to trace earlier ancestors.
3129 if Nkind (P) = N_Package_Body
3130 and then Nkind (Original_Node (P)) = N_Package_Instantiation
3132 P_Spec := Original_Node (P);
3135 if No (Parent_Spec (P_Spec)) then
3139 Make_Selected_Component (Loc,
3140 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
3141 Selector_Name => P_Ref);
3143 end Build_Ancestor_Name;
3145 ---------------------
3146 -- Build_Unit_Name --
3147 ---------------------
3149 function Build_Unit_Name return Node_Id is
3153 if No (Parent_Spec (P_Unit)) then
3154 return New_Reference_To (P_Name, Loc);
3158 Make_Expanded_Name (Loc,
3159 Chars => Chars (P_Name),
3160 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
3161 Selector_Name => New_Reference_To (P_Name, Loc));
3162 Set_Entity (Result, P_Name);
3165 end Build_Unit_Name;
3167 -- Start of processing for Implicit_With_On_Parent
3170 -- The unit of the current compilation may be a package body that
3171 -- replaces an instance node. In this case we need the original instance
3172 -- node to construct the proper parent name.
3174 if Nkind (P_Unit) = N_Package_Body
3175 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
3177 P_Unit := Original_Node (P_Unit);
3180 -- We add the implicit with if the child unit is the current unit being
3181 -- compiled. If the current unit is a body, we do not want to add an
3182 -- implicit_with a second time to the corresponding spec.
3184 if Nkind (Child_Unit) = N_Package_Declaration
3185 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
3190 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
3192 Set_Library_Unit (Withn, P);
3193 Set_Corresponding_Spec (Withn, P_Name);
3194 Set_First_Name (Withn, True);
3195 Set_Implicit_With (Withn, True);
3197 -- Node is placed at the beginning of the context items, so that
3198 -- subsequent use clauses on the parent can be validated.
3200 Prepend (Withn, Context_Items (N));
3201 Mark_Rewrite_Insertion (Withn);
3202 Install_Withed_Unit (Withn);
3204 if Is_Child_Spec (P_Unit) then
3205 Implicit_With_On_Parent (P_Unit, N);
3207 end Implicit_With_On_Parent;
3213 function In_Chain (E : Entity_Id) return Boolean is
3217 H := Current_Entity (E);
3218 while Present (H) loop
3229 ---------------------
3230 -- Install_Context --
3231 ---------------------
3233 procedure Install_Context (N : Node_Id) is
3234 Lib_Unit : constant Node_Id := Unit (N);
3237 Install_Context_Clauses (N);
3239 if Is_Child_Spec (Lib_Unit) then
3240 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
3243 Install_Limited_Context_Clauses (N);
3244 end Install_Context;
3246 -----------------------------
3247 -- Install_Context_Clauses --
3248 -----------------------------
3250 procedure Install_Context_Clauses (N : Node_Id) is
3251 Lib_Unit : constant Node_Id := Unit (N);
3253 Uname_Node : Entity_Id;
3254 Check_Private : Boolean := False;
3255 Decl_Node : Node_Id;
3256 Lib_Parent : Entity_Id;
3259 -- First skip configuration pragmas at the start of the context. They
3260 -- are not technically part of the context clause, but that's where the
3261 -- parser puts them. Note they were analyzed in Analyze_Context.
3263 Item := First (Context_Items (N));
3264 while Present (Item)
3265 and then Nkind (Item) = N_Pragma
3266 and then Pragma_Name (Item) in Configuration_Pragma_Names
3271 -- Loop through the actual context clause items. We process everything
3272 -- except Limited_With clauses in this routine. Limited_With clauses
3273 -- are separately installed (see Install_Limited_Context_Clauses).
3275 while Present (Item) loop
3277 -- Case of explicit WITH clause
3279 if Nkind (Item) = N_With_Clause
3280 and then not Implicit_With (Item)
3282 if Limited_Present (Item) then
3284 -- Limited withed units will be installed later
3288 -- If Name (Item) is not an entity name, something is wrong, and
3289 -- this will be detected in due course, for now ignore the item
3291 elsif not Is_Entity_Name (Name (Item)) then
3294 elsif No (Entity (Name (Item))) then
3295 Set_Entity (Name (Item), Any_Id);
3299 Uname_Node := Entity (Name (Item));
3301 if Is_Private_Descendant (Uname_Node) then
3302 Check_Private := True;
3305 Install_Withed_Unit (Item);
3307 Decl_Node := Unit_Declaration_Node (Uname_Node);
3309 -- If the unit is a subprogram instance, it appears nested within
3310 -- a package that carries the parent information.
3312 if Is_Generic_Instance (Uname_Node)
3313 and then Ekind (Uname_Node) /= E_Package
3315 Decl_Node := Parent (Parent (Decl_Node));
3318 if Is_Child_Spec (Decl_Node) then
3319 if Nkind (Name (Item)) = N_Expanded_Name then
3320 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3322 -- If not an expanded name, the child unit must be a
3323 -- renaming, nothing to do.
3328 elsif Nkind (Decl_Node) = N_Subprogram_Body
3329 and then not Acts_As_Spec (Parent (Decl_Node))
3330 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3332 Implicit_With_On_Parent
3333 (Unit (Library_Unit (Parent (Decl_Node))), N);
3336 -- Check license conditions unless this is a dummy unit
3338 if Sloc (Library_Unit (Item)) /= No_Location then
3339 License_Check : declare
3340 Withu : constant Unit_Number_Type :=
3341 Get_Source_Unit (Library_Unit (Item));
3342 Withl : constant License_Type :=
3343 License (Source_Index (Withu));
3344 Unitl : constant License_Type :=
3345 License (Source_Index (Current_Sem_Unit));
3347 procedure License_Error;
3348 -- Signal error of bad license
3354 procedure License_Error is
3357 ("license of withed unit & may be inconsistent??",
3361 -- Start of processing for License_Check
3364 -- Exclude license check if withed unit is an internal unit.
3365 -- This situation arises e.g. with the GPL version of GNAT.
3367 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3370 -- Otherwise check various cases
3382 if Withl = Restricted then
3386 when Modified_GPL =>
3387 if Withl = Restricted or else Withl = GPL then
3391 when Unrestricted =>
3398 -- Case of USE PACKAGE clause
3400 elsif Nkind (Item) = N_Use_Package_Clause then
3401 Analyze_Use_Package (Item);
3403 -- Case of USE TYPE clause
3405 elsif Nkind (Item) = N_Use_Type_Clause then
3406 Analyze_Use_Type (Item);
3410 elsif Nkind (Item) = N_Pragma then
3418 if Is_Child_Spec (Lib_Unit) then
3420 -- The unit also has implicit with_clauses on its own parents
3422 if No (Context_Items (N)) then
3423 Set_Context_Items (N, New_List);
3426 Implicit_With_On_Parent (Lib_Unit, N);
3429 -- If the unit is a body, the context of the specification must also
3430 -- be installed. That includes private with_clauses in that context.
3432 if Nkind (Lib_Unit) = N_Package_Body
3433 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3434 and then not Acts_As_Spec (N))
3436 Install_Context (Library_Unit (N));
3438 -- Only install private with-clauses of a spec that comes from
3439 -- source, excluding specs created for a subprogram body that is
3442 if Comes_From_Source (Library_Unit (N)) then
3443 Install_Private_With_Clauses
3444 (Defining_Entity (Unit (Library_Unit (N))));
3447 if Is_Child_Spec (Unit (Library_Unit (N))) then
3449 -- If the unit is the body of a public child unit, the private
3450 -- declarations of the parent must be made visible. If the child
3451 -- unit is private, the private declarations have been installed
3452 -- already in the call to Install_Parents for the spec. Installing
3453 -- private declarations must be done for all ancestors of public
3454 -- child units. In addition, sibling units mentioned in the
3455 -- context clause of the body are directly visible.
3463 Lib_Spec := Unit (Library_Unit (N));
3464 while Is_Child_Spec (Lib_Spec) loop
3465 P := Unit (Parent_Spec (Lib_Spec));
3466 P_Name := Defining_Entity (P);
3468 if not (Private_Present (Parent (Lib_Spec)))
3469 and then not In_Private_Part (P_Name)
3471 Install_Private_Declarations (P_Name);
3472 Install_Private_With_Clauses (P_Name);
3473 Set_Use (Private_Declarations (Specification (P)));
3481 -- For a package body, children in context are immediately visible
3483 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3486 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3487 N_Generic_Subprogram_Declaration,
3488 N_Package_Declaration,
3489 N_Subprogram_Declaration)
3491 if Is_Child_Spec (Lib_Unit) then
3492 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3493 Set_Is_Private_Descendant
3494 (Defining_Entity (Lib_Unit),
3495 Is_Private_Descendant (Lib_Parent)
3496 or else Private_Present (Parent (Lib_Unit)));
3499 Set_Is_Private_Descendant
3500 (Defining_Entity (Lib_Unit),
3501 Private_Present (Parent (Lib_Unit)));
3505 if Check_Private then
3506 Check_Private_Child_Unit (N);
3508 end Install_Context_Clauses;
3510 -------------------------------------
3511 -- Install_Limited_Context_Clauses --
3512 -------------------------------------
3514 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3517 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3518 -- Check that the unlimited view of a given compilation_unit is not
3519 -- already visible through "use + renamings".
3521 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3522 -- Check that if a limited_with clause of a given compilation_unit
3523 -- mentions a descendant of a private child of some library unit, then
3524 -- the given compilation_unit shall be the declaration of a private
3525 -- descendant of that library unit, or a public descendant of such. The
3526 -- code is analogous to that of Check_Private_Child_Unit but we cannot
3527 -- use entities on the limited with_clauses because their units have not
3528 -- been analyzed, so we have to climb the tree of ancestors looking for
3529 -- private keywords.
3531 procedure Expand_Limited_With_Clause
3532 (Comp_Unit : Node_Id;
3535 -- If a child unit appears in a limited_with clause, there are implicit
3536 -- limited_with clauses on all parents that are not already visible
3537 -- through a regular with clause. This procedure creates the implicit
3538 -- limited with_clauses for the parents and loads the corresponding
3539 -- units. The shadow entities are created when the inserted clause is
3540 -- analyzed. Implements Ada 2005 (AI-50217).
3542 ---------------------
3543 -- Check_Renamings --
3544 ---------------------
3546 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3555 pragma Assert (Nkind (W) = N_With_Clause);
3557 -- Protect the frontend against previous critical errors
3559 case Nkind (Unit (Library_Unit (W))) is
3560 when N_Subprogram_Declaration |
3561 N_Package_Declaration |
3562 N_Generic_Subprogram_Declaration |
3563 N_Generic_Package_Declaration =>
3570 -- Check "use + renamings"
3572 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3573 Spec := Specification (Unit (P));
3575 Item := First (Visible_Declarations (Spec));
3576 while Present (Item) loop
3578 -- Look only at use package clauses
3580 if Nkind (Item) = N_Use_Package_Clause then
3582 -- Traverse the list of packages
3584 Nam := First (Names (Item));
3585 while Present (Nam) loop
3588 pragma Assert (Present (Parent (E)));
3590 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3591 and then Renamed_Entity (E) = WEnt
3593 -- The unlimited view is visible through use clause and
3594 -- renamings. There is no need to generate the error
3595 -- message here because Is_Visible_Through_Renamings
3596 -- takes care of generating the precise error message.
3600 elsif Nkind (Parent (E)) = N_Package_Specification then
3602 -- The use clause may refer to a local package.
3603 -- Check all the enclosing scopes.
3606 while E2 /= Standard_Standard
3614 ("unlimited view visible through use clause ", W);
3626 -- Recursive call to check all the ancestors
3628 if Is_Child_Spec (Unit (P)) then
3629 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3631 end Check_Renamings;
3633 ---------------------------------------
3634 -- Check_Private_Limited_Withed_Unit --
3635 ---------------------------------------
3637 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3638 Curr_Parent : Node_Id;
3639 Child_Parent : Node_Id;
3640 Curr_Private : Boolean;
3643 -- Compilation unit of the parent of the withed library unit
3645 Child_Parent := Library_Unit (Item);
3647 -- If the child unit is a public child, then locate its nearest
3648 -- private ancestor, if any, then Child_Parent will then be set to
3649 -- the parent of that ancestor.
3651 if not Private_Present (Library_Unit (Item)) then
3652 while Present (Child_Parent)
3653 and then not Private_Present (Child_Parent)
3655 Child_Parent := Parent_Spec (Unit (Child_Parent));
3658 if No (Child_Parent) then
3663 Child_Parent := Parent_Spec (Unit (Child_Parent));
3665 -- Traverse all the ancestors of the current compilation unit to
3666 -- check if it is a descendant of named library unit.
3668 Curr_Parent := Parent (Item);
3669 Curr_Private := Private_Present (Curr_Parent);
3671 while Present (Parent_Spec (Unit (Curr_Parent)))
3672 and then Curr_Parent /= Child_Parent
3674 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3675 Curr_Private := Curr_Private or else Private_Present (Curr_Parent);
3678 if Curr_Parent /= Child_Parent then
3680 ("unit in with clause is private child unit!", Item);
3682 ("\current unit must also have parent&!",
3683 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3685 elsif Private_Present (Parent (Item))
3686 or else Curr_Private
3687 or else Private_Present (Item)
3688 or else Nkind_In (Unit (Parent (Item)), N_Package_Body,
3692 -- Current unit is private, of descendant of a private unit
3698 ("current unit must also be private descendant of&",
3699 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3701 end Check_Private_Limited_Withed_Unit;
3703 --------------------------------
3704 -- Expand_Limited_With_Clause --
3705 --------------------------------
3707 procedure Expand_Limited_With_Clause
3708 (Comp_Unit : Node_Id;
3712 Loc : constant Source_Ptr := Sloc (Nam);
3713 Unum : Unit_Number_Type;
3716 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3717 -- Returns true if the context already includes a with_clause for
3718 -- this unit. If the with_clause is non-limited, the unit is fully
3719 -- visible and an implicit limited_with should not be created. If
3720 -- there is already a limited_with clause for W, a second one is
3721 -- simply redundant.
3723 --------------------------
3724 -- Previous_Withed_Unit --
3725 --------------------------
3727 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3731 -- A limited with_clause cannot appear in the same context_clause
3732 -- as a nonlimited with_clause which mentions the same library.
3734 Item := First (Context_Items (Comp_Unit));
3735 while Present (Item) loop
3736 if Nkind (Item) = N_With_Clause
3737 and then Library_Unit (Item) = Library_Unit (W)
3746 end Previous_Withed_Unit;
3748 -- Start of processing for Expand_Limited_With_Clause
3751 if Nkind (Nam) = N_Identifier then
3753 -- Create node for name of withed unit
3756 Make_With_Clause (Loc,
3757 Name => New_Copy (Nam));
3759 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3761 Make_With_Clause (Loc,
3762 Name => Make_Selected_Component (Loc,
3763 Prefix => New_Copy_Tree (Prefix (Nam)),
3764 Selector_Name => New_Copy (Selector_Name (Nam))));
3765 Set_Parent (Withn, Parent (N));
3768 Set_Limited_Present (Withn);
3769 Set_First_Name (Withn);
3770 Set_Implicit_With (Withn);
3774 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3779 -- Do not generate a limited_with_clause on the current unit. This
3780 -- path is taken when a unit has a limited_with clause on one of its
3783 if Unum = Current_Sem_Unit then
3787 Set_Library_Unit (Withn, Cunit (Unum));
3788 Set_Corresponding_Spec
3789 (Withn, Specification (Unit (Cunit (Unum))));
3791 if not Previous_Withed_Unit (Withn) then
3792 Prepend (Withn, Context_Items (Parent (N)));
3793 Mark_Rewrite_Insertion (Withn);
3795 -- Add implicit limited_with_clauses for parents of child units
3796 -- mentioned in limited_with clauses.
3798 if Nkind (Nam) = N_Selected_Component then
3799 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3804 if not Limited_View_Installed (Withn) then
3805 Install_Limited_Withed_Unit (Withn);
3808 end Expand_Limited_With_Clause;
3810 -- Start of processing for Install_Limited_Context_Clauses
3813 Item := First (Context_Items (N));
3814 while Present (Item) loop
3815 if Nkind (Item) = N_With_Clause
3816 and then Limited_Present (Item)
3817 and then not Error_Posted (Item)
3819 if Nkind (Name (Item)) = N_Selected_Component then
3820 Expand_Limited_With_Clause
3821 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3824 Check_Private_Limited_Withed_Unit (Item);
3826 if not Implicit_With (Item)
3827 and then Is_Child_Spec (Unit (N))
3829 Check_Renamings (Parent_Spec (Unit (N)), Item);
3832 -- A unit may have a limited with on itself if it has a limited
3833 -- with_clause on one of its child units. In that case it is
3834 -- already being compiled and it makes no sense to install its
3837 -- If the item is a limited_private_with_clause, install it if the
3838 -- current unit is a body or if it is a private child. Otherwise
3839 -- the private clause is installed before analyzing the private
3840 -- part of the current unit.
3842 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3843 and then not Limited_View_Installed (Item)
3845 not Is_Ancestor_Unit
3846 (Library_Unit (Item), Cunit (Current_Sem_Unit))
3848 if not Private_Present (Item)
3849 or else Private_Present (N)
3850 or else Nkind_In (Unit (N), N_Package_Body,
3854 Install_Limited_Withed_Unit (Item);
3862 -- Ada 2005 (AI-412): Examine visible declarations of a package spec,
3863 -- looking for incomplete subtype declarations of incomplete types
3864 -- visible through a limited with clause.
3866 if Ada_Version >= Ada_2005
3867 and then Analyzed (N)
3868 and then Nkind (Unit (N)) = N_Package_Declaration
3873 Non_Lim_View : Entity_Id;
3876 Decl := First (Visible_Declarations (Specification (Unit (N))));
3877 while Present (Decl) loop
3878 if Nkind (Decl) = N_Subtype_Declaration
3880 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3882 From_With_Type (Defining_Identifier (Decl))
3884 Def_Id := Defining_Identifier (Decl);
3885 Non_Lim_View := Non_Limited_View (Def_Id);
3887 if not Is_Incomplete_Type (Non_Lim_View) then
3889 -- Convert an incomplete subtype declaration into a
3890 -- corresponding non-limited view subtype declaration.
3891 -- This is usually the case when analyzing a body that
3892 -- has regular with clauses, when the spec has limited
3895 -- If the non-limited view is still incomplete, it is
3896 -- the dummy entry already created, and the declaration
3897 -- cannot be reanalyzed. This is the case when installing
3898 -- a parent unit that has limited with-clauses.
3900 Set_Subtype_Indication (Decl,
3901 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3902 Set_Etype (Def_Id, Non_Lim_View);
3903 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3904 Set_Analyzed (Decl, False);
3906 -- Reanalyze the declaration, suppressing the call to
3907 -- Enter_Name to avoid duplicate names.
3909 Analyze_Subtype_Declaration
3919 end Install_Limited_Context_Clauses;
3921 ---------------------
3922 -- Install_Parents --
3923 ---------------------
3925 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3932 P := Unit (Parent_Spec (Lib_Unit));
3933 P_Name := Get_Parent_Entity (P);
3935 if Etype (P_Name) = Any_Type then
3939 if Ekind (P_Name) = E_Generic_Package
3940 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3941 N_Generic_Package_Declaration)
3942 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3945 ("child of a generic package must be a generic unit", Lib_Unit);
3947 elsif not Is_Package_Or_Generic_Package (P_Name) then
3949 ("parent unit must be package or generic package", Lib_Unit);
3950 raise Unrecoverable_Error;
3952 elsif Present (Renamed_Object (P_Name)) then
3953 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3954 raise Unrecoverable_Error;
3956 -- Verify that a child of an instance is itself an instance, or the
3957 -- renaming of one. Given that an instance that is a unit is replaced
3958 -- with a package declaration, check against the original node. The
3959 -- parent may be currently being instantiated, in which case it appears
3960 -- as a declaration, but the generic_parent is already established
3961 -- indicating that we deal with an instance.
3963 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3964 if Nkind (Lib_Unit) in N_Renaming_Declaration
3965 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3967 (Nkind (Lib_Unit) = N_Package_Declaration
3968 and then Present (Generic_Parent (Specification (Lib_Unit))))
3973 ("child of an instance must be an instance or renaming",
3978 -- This is the recursive call that ensures all parents are loaded
3980 if Is_Child_Spec (P) then
3982 Is_Private or else Private_Present (Parent (Lib_Unit)));
3985 -- Now we can install the context for this parent
3987 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3988 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3989 Install_Siblings (P_Name, Parent (Lib_Unit));
3991 -- The child unit is in the declarative region of the parent. The parent
3992 -- must therefore appear in the scope stack and be visible, as when
3993 -- compiling the corresponding body. If the child unit is private or it
3994 -- is a package body, private declarations must be accessible as well.
3995 -- Use declarations in the parent must also be installed. Finally, other
3996 -- child units of the same parent that are in the context are
3997 -- immediately visible.
3999 -- Find entity for compilation unit, and set its private descendant
4000 -- status as needed. Indicate that it is a compilation unit, which is
4001 -- redundant in general, but needed if this is a generated child spec
4002 -- for a child body without previous spec.
4004 E_Name := Defining_Entity (Lib_Unit);
4006 Set_Is_Child_Unit (E_Name);
4007 Set_Is_Compilation_Unit (E_Name);
4009 Set_Is_Private_Descendant (E_Name,
4010 Is_Private_Descendant (P_Name)
4011 or else Private_Present (Parent (Lib_Unit)));
4013 P_Spec := Specification (Unit_Declaration_Node (P_Name));
4014 Push_Scope (P_Name);
4016 -- Save current visibility of unit
4018 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
4019 Is_Immediately_Visible (P_Name);
4020 Set_Is_Immediately_Visible (P_Name);
4021 Install_Visible_Declarations (P_Name);
4022 Set_Use (Visible_Declarations (P_Spec));
4024 -- If the parent is a generic unit, its formal part may contain formal
4025 -- packages and use clauses for them.
4027 if Ekind (P_Name) = E_Generic_Package then
4028 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
4032 or else Private_Present (Parent (Lib_Unit))
4034 Install_Private_Declarations (P_Name);
4035 Install_Private_With_Clauses (P_Name);
4036 Set_Use (Private_Declarations (P_Spec));
4038 end Install_Parents;
4040 ----------------------------------
4041 -- Install_Private_With_Clauses --
4042 ----------------------------------
4044 procedure Install_Private_With_Clauses (P : Entity_Id) is
4045 Decl : constant Node_Id := Unit_Declaration_Node (P);
4049 if Debug_Flag_I then
4050 Write_Str ("install private with clauses of ");
4051 Write_Name (Chars (P));
4055 if Nkind (Parent (Decl)) = N_Compilation_Unit then
4056 Item := First (Context_Items (Parent (Decl)));
4057 while Present (Item) loop
4058 if Nkind (Item) = N_With_Clause
4059 and then Private_Present (Item)
4061 -- If the unit is an ancestor of the current one, it is the
4062 -- case of a private limited with clause on a child unit, and
4063 -- the compilation of one of its descendants, In that case the
4064 -- limited view is errelevant.
4066 if Limited_Present (Item) then
4067 if not Limited_View_Installed (Item)
4069 not Is_Ancestor_Unit (Library_Unit (Item),
4070 Cunit (Current_Sem_Unit))
4072 Install_Limited_Withed_Unit (Item);
4075 Install_Withed_Unit (Item, Private_With_OK => True);
4082 end Install_Private_With_Clauses;
4084 ----------------------
4085 -- Install_Siblings --
4086 ----------------------
4088 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
4094 -- Iterate over explicit with clauses, and check whether the scope of
4095 -- each entity is an ancestor of the current unit, in which case it is
4096 -- immediately visible.
4098 Item := First (Context_Items (N));
4099 while Present (Item) loop
4101 -- Do not install private_with_clauses declaration, unless unit
4102 -- is itself a private child unit, or is a body. Note that for a
4103 -- subprogram body the private_with_clause does not take effect until
4104 -- after the specification.
4106 if Nkind (Item) /= N_With_Clause
4107 or else Implicit_With (Item)
4108 or else Limited_Present (Item)
4109 or else Error_Posted (Item)
4113 elsif not Private_Present (Item)
4114 or else Private_Present (N)
4115 or else Nkind (Unit (N)) = N_Package_Body
4117 Id := Entity (Name (Item));
4119 if Is_Child_Unit (Id)
4120 and then Is_Ancestor_Package (Scope (Id), U_Name)
4122 Set_Is_Immediately_Visible (Id);
4124 -- Check for the presence of another unit in the context that
4125 -- may be inadvertently hidden by the child.
4127 Prev := Current_Entity (Id);
4130 and then Is_Immediately_Visible (Prev)
4131 and then not Is_Child_Unit (Prev)
4137 Clause := First (Context_Items (N));
4138 while Present (Clause) loop
4139 if Nkind (Clause) = N_With_Clause
4140 and then Entity (Name (Clause)) = Prev
4143 ("child unit& hides compilation unit " &
4144 "with the same name??",
4154 -- The With_Clause may be on a grand-child or one of its further
4155 -- descendants, which makes a child immediately visible. Examine
4156 -- ancestry to determine whether such a child exists. For example,
4157 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
4158 -- is immediately visible.
4160 elsif Is_Child_Unit (Id) then
4166 while Is_Child_Unit (Par) loop
4167 if Is_Ancestor_Package (Scope (Par), U_Name) then
4168 Set_Is_Immediately_Visible (Par);
4177 -- If the item is a private with-clause on a child unit, the parent
4178 -- may have been installed already, but the child unit must remain
4179 -- invisible until installed in a private part or body, unless there
4180 -- is already a regular with_clause for it in the current unit.
4182 elsif Private_Present (Item) then
4183 Id := Entity (Name (Item));
4185 if Is_Child_Unit (Id) then
4189 function In_Context return Boolean;
4190 -- Scan context of current unit, to check whether there is
4191 -- a with_clause on the same unit as a private with-clause
4192 -- on a parent, in which case child unit is visible. If the
4193 -- unit is a grand-child, the same applies to its parent.
4199 function In_Context return Boolean is
4202 First (Context_Items (Cunit (Current_Sem_Unit)));
4203 while Present (Clause) loop
4204 if Nkind (Clause) = N_With_Clause
4205 and then Comes_From_Source (Clause)
4206 and then Is_Entity_Name (Name (Clause))
4207 and then not Private_Present (Clause)
4209 if Entity (Name (Clause)) = Id
4211 (Nkind (Name (Clause)) = N_Expanded_Name
4212 and then Entity (Prefix (Name (Clause))) = Id)
4225 Set_Is_Visible_Lib_Unit (Id, In_Context);
4232 end Install_Siblings;
4234 ---------------------------------
4235 -- Install_Limited_Withed_Unit --
4236 ---------------------------------
4238 procedure Install_Limited_Withed_Unit (N : Node_Id) is
4239 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
4242 Is_Child_Package : Boolean := False;
4243 Lim_Header : Entity_Id;
4244 Lim_Typ : Entity_Id;
4246 procedure Check_Body_Required;
4247 -- A unit mentioned in a limited with_clause may not be mentioned in
4248 -- a regular with_clause, but must still be included in the current
4249 -- partition. We need to determine whether the unit needs a body, so
4250 -- that the binder can determine the name of the file to be compiled.
4251 -- Checking whether a unit needs a body can be done without semantic
4252 -- analysis, by examining the nature of the declarations in the package.
4254 function Has_Limited_With_Clause
4255 (C_Unit : Entity_Id;
4256 Pack : Entity_Id) return Boolean;
4257 -- Determine whether any package in the ancestor chain starting with
4258 -- C_Unit has a limited with clause for package Pack.
4260 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
4261 -- Check if some package installed though normal with-clauses has a
4262 -- renaming declaration of package P. AARM 10.1.2(21/2).
4264 -------------------------
4265 -- Check_Body_Required --
4266 -------------------------
4268 procedure Check_Body_Required is
4269 PA : constant List_Id :=
4270 Pragmas_After (Aux_Decls_Node (Parent (P_Unit)));
4272 procedure Check_Declarations (Spec : Node_Id);
4273 -- Recursive procedure that does the work and checks nested packages
4275 ------------------------
4276 -- Check_Declarations --
4277 ------------------------
4279 procedure Check_Declarations (Spec : Node_Id) is
4281 Incomplete_Decls : constant Elist_Id := New_Elmt_List;
4283 Subp_List : constant Elist_Id := New_Elmt_List;
4285 procedure Check_Pragma_Import (P : Node_Id);
4286 -- If a pragma import applies to a previous subprogram, the
4287 -- enclosing unit may not need a body. The processing is syntactic
4288 -- and does not require a declaration to be analyzed. The code
4289 -- below also handles pragma Import when applied to a subprogram
4290 -- that renames another. In this case the pragma applies to the
4293 -- Chains of multiple renames are not handled by the code below.
4294 -- It is probably impossible to handle all cases without proper
4295 -- name resolution. In such cases the algorithm is conservative
4296 -- and will indicate that a body is needed???
4298 -------------------------
4299 -- Check_Pragma_Import --
4300 -------------------------
4302 procedure Check_Pragma_Import (P : Node_Id) is
4308 procedure Remove_Homonyms (E : Node_Id);
4309 -- Make one pass over list of subprograms. Called again if
4310 -- subprogram is a renaming. E is known to be an identifier.
4312 ---------------------
4313 -- Remove_Homonyms --
4314 ---------------------
4316 procedure Remove_Homonyms (E : Node_Id) is
4317 R : Entity_Id := Empty;
4318 -- Name of renamed entity, if any
4321 Subp_Id := First_Elmt (Subp_List);
4322 while Present (Subp_Id) loop
4323 if Chars (Node (Subp_Id)) = Chars (E) then
4324 if Nkind (Parent (Parent (Node (Subp_Id))))
4325 /= N_Subprogram_Renaming_Declaration
4328 Next_Elmt (Subp_Id);
4329 Remove_Elmt (Subp_List, Prev_Id);
4331 R := Name (Parent (Parent (Node (Subp_Id))));
4335 Next_Elmt (Subp_Id);
4340 if Nkind (R) = N_Identifier then
4341 Remove_Homonyms (R);
4343 elsif Nkind (R) = N_Selected_Component then
4344 Remove_Homonyms (Selector_Name (R));
4346 -- Renaming of attribute
4352 end Remove_Homonyms;
4354 -- Start of processing for Check_Pragma_Import
4357 -- Find name of entity in Import pragma. We have not analyzed
4358 -- the construct, so we must guard against syntax errors.
4360 Arg := Next (First (Pragma_Argument_Associations (P)));
4363 or else Nkind (Expression (Arg)) /= N_Identifier
4367 Imported := Expression (Arg);
4370 Remove_Homonyms (Imported);
4371 end Check_Pragma_Import;
4373 -- Start of processing for Check_Declarations
4376 -- Search for Elaborate Body pragma
4378 Decl := First (Visible_Declarations (Spec));
4379 while Present (Decl)
4380 and then Nkind (Decl) = N_Pragma
4382 if Get_Pragma_Id (Decl) = Pragma_Elaborate_Body then
4383 Set_Body_Required (Library_Unit (N));
4390 -- Look for declarations that require the presence of a body. We
4391 -- have already skipped pragmas at the start of the list.
4393 while Present (Decl) loop
4395 -- Subprogram that comes from source means body may be needed.
4396 -- Save for subsequent examination of import pragmas.
4398 if Comes_From_Source (Decl)
4399 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4400 N_Subprogram_Renaming_Declaration,
4401 N_Generic_Subprogram_Declaration))
4403 Append_Elmt (Defining_Entity (Decl), Subp_List);
4405 -- Package declaration of generic package declaration. We need
4406 -- to recursively examine nested declarations.
4408 elsif Nkind_In (Decl, N_Package_Declaration,
4409 N_Generic_Package_Declaration)
4411 Check_Declarations (Specification (Decl));
4413 elsif Nkind (Decl) = N_Pragma
4414 and then Pragma_Name (Decl) = Name_Import
4416 Check_Pragma_Import (Decl);
4422 -- Same set of tests for private part. In addition to subprograms
4423 -- detect the presence of Taft Amendment types (incomplete types
4424 -- completed in the body).
4426 Decl := First (Private_Declarations (Spec));
4427 while Present (Decl) loop
4428 if Comes_From_Source (Decl)
4429 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4430 N_Subprogram_Renaming_Declaration,
4431 N_Generic_Subprogram_Declaration))
4433 Append_Elmt (Defining_Entity (Decl), Subp_List);
4435 elsif Nkind_In (Decl, N_Package_Declaration,
4436 N_Generic_Package_Declaration)
4438 Check_Declarations (Specification (Decl));
4440 -- Collect incomplete type declarations for separate pass
4442 elsif Nkind (Decl) = N_Incomplete_Type_Declaration then
4443 Append_Elmt (Decl, Incomplete_Decls);
4445 elsif Nkind (Decl) = N_Pragma
4446 and then Pragma_Name (Decl) = Name_Import
4448 Check_Pragma_Import (Decl);
4454 -- Now check incomplete declarations to locate Taft amendment
4455 -- types. This can be done by examining the defining identifiers
4456 -- of type declarations without real semantic analysis.
4462 Inc := First_Elmt (Incomplete_Decls);
4463 while Present (Inc) loop
4464 Decl := Next (Node (Inc));
4465 while Present (Decl) loop
4466 if Nkind (Decl) = N_Full_Type_Declaration
4467 and then Chars (Defining_Identifier (Decl)) =
4468 Chars (Defining_Identifier (Node (Inc)))
4476 -- If no completion, this is a TAT, and a body is needed
4479 Set_Body_Required (Library_Unit (N));
4487 -- Finally, check whether there are subprograms that still require
4488 -- a body, i.e. are not renamings or null.
4490 if not Is_Empty_Elmt_List (Subp_List) then
4496 Subp_Id := First_Elmt (Subp_List);
4497 Spec := Parent (Node (Subp_Id));
4499 while Present (Subp_Id) loop
4500 if Nkind (Parent (Spec))
4501 = N_Subprogram_Renaming_Declaration
4505 elsif Nkind (Spec) = N_Procedure_Specification
4506 and then Null_Present (Spec)
4511 Set_Body_Required (Library_Unit (N));
4515 Next_Elmt (Subp_Id);
4519 end Check_Declarations;
4521 -- Start of processing for Check_Body_Required
4524 -- If this is an imported package (Java and CIL usage) no body is
4525 -- needed. Scan list of pragmas that may follow a compilation unit
4526 -- to look for a relevant pragma Import.
4528 if Present (PA) then
4534 while Present (Prag) loop
4535 if Nkind (Prag) = N_Pragma
4536 and then Get_Pragma_Id (Prag) = Pragma_Import
4546 Check_Declarations (Specification (P_Unit));
4547 end Check_Body_Required;
4549 -----------------------------
4550 -- Has_Limited_With_Clause --
4551 -----------------------------
4553 function Has_Limited_With_Clause
4554 (C_Unit : Entity_Id;
4555 Pack : Entity_Id) return Boolean
4562 while Present (Par) loop
4563 if Ekind (Par) /= E_Package then
4567 -- Retrieve the Compilation_Unit node for Par and determine if
4568 -- its context clauses contain a limited with for Pack.
4570 Par_Unit := Parent (Parent (Parent (Par)));
4572 if Nkind (Par_Unit) = N_Package_Declaration then
4573 Par_Unit := Parent (Par_Unit);
4576 if Has_With_Clause (Par_Unit, Pack, True) then
4580 -- If there are more ancestors, climb up the tree, otherwise we
4583 if Is_Child_Unit (Par) then
4591 end Has_Limited_With_Clause;
4593 ----------------------------------
4594 -- Is_Visible_Through_Renamings --
4595 ----------------------------------
4597 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4598 Kind : constant Node_Kind :=
4599 Nkind (Unit (Cunit (Current_Sem_Unit)));
4605 -- Example of the error detected by this subprogram:
4613 -- package Ren_P renames P;
4619 -- limited with P; -- ERROR
4620 -- package R.C is ...
4622 Aux_Unit := Cunit (Current_Sem_Unit);
4625 Item := First (Context_Items (Aux_Unit));
4626 while Present (Item) loop
4627 if Nkind (Item) = N_With_Clause
4628 and then not Limited_Present (Item)
4629 and then Nkind (Unit (Library_Unit (Item))) =
4630 N_Package_Declaration
4633 First (Visible_Declarations
4634 (Specification (Unit (Library_Unit (Item)))));
4635 while Present (Decl) loop
4636 if Nkind (Decl) = N_Package_Renaming_Declaration
4637 and then Entity (Name (Decl)) = P
4639 -- Generate the error message only if the current unit
4640 -- is a package declaration; in case of subprogram
4641 -- bodies and package bodies we just return True to
4642 -- indicate that the limited view must not be
4645 if Kind = N_Package_Declaration then
4647 ("simultaneous visibility of the limited and " &
4648 "unlimited views not allowed", N);
4649 Error_Msg_Sloc := Sloc (Item);
4651 ("\\ unlimited view of & visible through the " &
4652 "context clause #", N, P);
4653 Error_Msg_Sloc := Sloc (Decl);
4654 Error_Msg_NE ("\\ and the renaming #", N, P);
4667 -- If it is a body not acting as spec, follow pointer to the
4668 -- corresponding spec, otherwise follow pointer to parent spec.
4670 if Present (Library_Unit (Aux_Unit))
4671 and then Nkind_In (Unit (Aux_Unit),
4672 N_Package_Body, N_Subprogram_Body)
4674 if Aux_Unit = Library_Unit (Aux_Unit) then
4676 -- Aux_Unit is a body that acts as a spec. Clause has
4677 -- already been flagged as illegal.
4682 Aux_Unit := Library_Unit (Aux_Unit);
4686 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4689 exit when No (Aux_Unit);
4693 end Is_Visible_Through_Renamings;
4695 -- Start of processing for Install_Limited_Withed_Unit
4698 pragma Assert (not Limited_View_Installed (N));
4700 -- In case of limited with_clause on subprograms, generics, instances,
4701 -- or renamings, the corresponding error was previously posted and we
4702 -- have nothing to do here. If the file is missing altogether, it has
4703 -- no source location.
4705 if Nkind (P_Unit) /= N_Package_Declaration
4706 or else Sloc (P_Unit) = No_Location
4711 P := Defining_Unit_Name (Specification (P_Unit));
4713 -- Handle child packages
4715 if Nkind (P) = N_Defining_Program_Unit_Name then
4716 Is_Child_Package := True;
4717 P := Defining_Identifier (P);
4720 -- Do not install the limited-view if the context of the unit is already
4721 -- available through a regular with clause.
4723 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4724 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4729 -- Do not install the limited-view if the full-view is already visible
4730 -- through renaming declarations.
4732 if Is_Visible_Through_Renamings (P) then
4736 -- Do not install the limited view if this is the unit being analyzed.
4737 -- This unusual case will happen when a unit has a limited_with clause
4738 -- on one of its children. The compilation of the child forces the load
4739 -- of the parent which tries to install the limited view of the child
4740 -- again. Installing the limited view must also be disabled when
4741 -- compiling the body of the child unit.
4743 if P = Cunit_Entity (Current_Sem_Unit)
4744 or else (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4745 and then P = Main_Unit_Entity
4746 and then Is_Ancestor_Unit
4747 (Cunit (Main_Unit), Cunit (Current_Sem_Unit)))
4752 -- This scenario is similar to the one above, the difference is that the
4753 -- compilation of sibling Par.Sib forces the load of parent Par which
4754 -- tries to install the limited view of Lim_Pack [1]. However Par.Sib
4755 -- has a with clause for Lim_Pack [2] in its body, and thus needs the
4756 -- non-limited views of all entities from Lim_Pack.
4758 -- limited with Lim_Pack; -- [1]
4759 -- package Par is ... package Lim_Pack is ...
4761 -- with Lim_Pack; -- [2]
4762 -- package Par.Sib is ... package body Par.Sib is ...
4764 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4765 -- Sem_Unit is the body of Par.Sib.
4767 if Ekind (P) = E_Package
4768 and then Ekind (Main_Unit_Entity) = E_Package
4769 and then Is_Child_Unit (Main_Unit_Entity)
4771 -- The body has a regular with clause
4773 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4774 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4776 -- One of the ancestors has a limited with clause
4778 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4779 N_Package_Specification
4780 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4785 -- A common use of the limited-with is to have a limited-with in the
4786 -- package spec, and a normal with in its package body. For example:
4788 -- limited with X; -- [1]
4792 -- package body A is ...
4794 -- The compilation of A's body installs the context clauses found at [2]
4795 -- and then the context clauses of its specification (found at [1]). As
4796 -- a consequence, at [1] the specification of X has been analyzed and it
4797 -- is immediately visible. According to the semantics of limited-with
4798 -- context clauses we don't install the limited view because the full
4799 -- view of X supersedes its limited view.
4801 if Analyzed (P_Unit)
4803 (Is_Immediately_Visible (P)
4804 or else (Is_Child_Package and then Is_Visible_Lib_Unit (P)))
4807 -- The presence of both the limited and the analyzed nonlimited view
4808 -- may also be an error, such as an illegal context for a limited
4809 -- with_clause. In that case, do not process the context item at all.
4811 if Error_Posted (N) then
4815 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body then
4819 Item := First (Context_Items (Cunit (Current_Sem_Unit)));
4820 while Present (Item) loop
4821 if Nkind (Item) = N_With_Clause
4822 and then Comes_From_Source (Item)
4823 and then Entity (Name (Item)) = P
4832 -- If this is a child body, assume that the nonlimited with_clause
4833 -- appears in an ancestor. Could be refined ???
4837 (Unit (Library_Unit (Cunit (Current_Sem_Unit)))))
4844 -- If in package declaration, nonlimited view brought in from
4845 -- parent unit or some error condition.
4851 if Debug_Flag_I then
4852 Write_Str ("install limited view of ");
4853 Write_Name (Chars (P));
4857 -- If the unit has not been analyzed and the limited view has not been
4858 -- already installed then we install it.
4860 if not Analyzed (P_Unit) then
4861 if not In_Chain (P) then
4863 -- Minimum decoration
4865 Set_Ekind (P, E_Package);
4866 Set_Etype (P, Standard_Void_Type);
4867 Set_Scope (P, Standard_Standard);
4868 Set_Is_Visible_Lib_Unit (P);
4870 if Is_Child_Package then
4871 Set_Is_Child_Unit (P);
4872 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4875 -- Place entity on visibility structure
4877 Set_Homonym (P, Current_Entity (P));
4878 Set_Current_Entity (P);
4880 if Debug_Flag_I then
4881 Write_Str (" (homonym) chain ");
4882 Write_Name (Chars (P));
4886 -- Install the incomplete view. The first element of the limited
4887 -- view is a header (an E_Package entity) used to reference the
4888 -- first shadow entity in the private part of the package.
4890 Lim_Header := Limited_View (P);
4891 Lim_Typ := First_Entity (Lim_Header);
4893 while Present (Lim_Typ)
4894 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4896 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4897 Set_Current_Entity (Lim_Typ);
4899 if Debug_Flag_I then
4900 Write_Str (" (homonym) chain ");
4901 Write_Name (Chars (Lim_Typ));
4905 Next_Entity (Lim_Typ);
4909 -- If the unit appears in a previous regular with_clause, the regular
4910 -- entities of the public part of the withed package must be replaced
4911 -- by the shadow ones.
4913 -- This code must be kept synchronized with the code that replaces the
4914 -- shadow entities by the real entities (see body of Remove_Limited
4915 -- With_Clause); otherwise the contents of the homonym chains are not
4919 -- Hide all the type entities of the public part of the package to
4920 -- avoid its usage. This is needed to cover all the subtype decla-
4921 -- rations because we do not remove them from the homonym chain.
4923 E := First_Entity (P);
4924 while Present (E) and then E /= First_Private_Entity (P) loop
4926 Set_Was_Hidden (E, Is_Hidden (E));
4933 -- Replace the real entities by the shadow entities of the limited
4934 -- view. The first element of the limited view is a header that is
4935 -- used to reference the first shadow entity in the private part
4936 -- of the package. Successive elements are the limited views of the
4937 -- type (including regular incomplete types) declared in the package.
4939 Lim_Header := Limited_View (P);
4941 Lim_Typ := First_Entity (Lim_Header);
4942 while Present (Lim_Typ)
4943 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4945 pragma Assert (not In_Chain (Lim_Typ));
4947 -- Do not unchain nested packages and child units
4949 if Ekind (Lim_Typ) /= E_Package
4950 and then not Is_Child_Unit (Lim_Typ)
4956 Prev := Current_Entity (Lim_Typ);
4959 -- Replace E in the homonyms list, so that the limited view
4960 -- becomes available.
4962 if E = Non_Limited_View (Lim_Typ) then
4963 Set_Homonym (Lim_Typ, Homonym (Prev));
4964 Set_Current_Entity (Lim_Typ);
4968 E := Homonym (Prev);
4970 -- E may have been removed when installing a previous
4971 -- limited_with_clause.
4975 exit when E = Non_Limited_View (Lim_Typ);
4977 Prev := Homonym (Prev);
4981 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4982 Set_Homonym (Prev, Lim_Typ);
4987 if Debug_Flag_I then
4988 Write_Str (" (homonym) chain ");
4989 Write_Name (Chars (Lim_Typ));
4994 Next_Entity (Lim_Typ);
4998 -- The package must be visible while the limited-with clause is active
4999 -- because references to the type P.T must resolve in the usual way.
5000 -- In addition, we remember that the limited-view has been installed to
5001 -- uninstall it at the point of context removal.
5003 Set_Is_Immediately_Visible (P);
5004 Set_Limited_View_Installed (N);
5006 -- If unit has not been analyzed in some previous context, check
5007 -- (imperfectly ???) whether it might need a body.
5009 if not Analyzed (P_Unit) then
5010 Check_Body_Required;
5013 -- If the package in the limited_with clause is a child unit, the clause
5014 -- is unanalyzed and appears as a selected component. Recast it as an
5015 -- expanded name so that the entity can be properly set. Use entity of
5016 -- parent, if available, for higher ancestors in the name.
5018 if Nkind (Name (N)) = N_Selected_Component then
5026 while Nkind (Nam) = N_Selected_Component
5027 and then Present (Ent)
5029 Change_Selected_Component_To_Expanded_Name (Nam);
5031 -- Set entity of parent identifiers if the unit is a child
5032 -- unit. This ensures that the tree is properly formed from
5033 -- semantic point of view (e.g. for ASIS queries). The unit
5034 -- entities are not fully analyzed, so we need to follow unit
5035 -- links in the tree.
5037 Set_Entity (Nam, Ent);
5039 Nam := Prefix (Nam);
5042 (Unit (Parent_Spec (Unit_Declaration_Node (Ent))));
5044 -- Set entity of last ancestor
5046 if Nkind (Nam) = N_Identifier then
5047 Set_Entity (Nam, Ent);
5053 Set_Entity (Name (N), P);
5054 Set_From_With_Type (P);
5055 end Install_Limited_Withed_Unit;
5057 -------------------------
5058 -- Install_Withed_Unit --
5059 -------------------------
5061 procedure Install_Withed_Unit
5062 (With_Clause : Node_Id;
5063 Private_With_OK : Boolean := False)
5065 Uname : constant Entity_Id := Entity (Name (With_Clause));
5066 P : constant Entity_Id := Scope (Uname);
5069 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
5070 -- compiling a package declaration and the Private_With_OK flag was not
5071 -- set by the caller. These declarations will be installed later (before
5072 -- analyzing the private part of the package).
5074 if Private_Present (With_Clause)
5075 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
5076 and then not (Private_With_OK)
5081 if Debug_Flag_I then
5082 if Private_Present (With_Clause) then
5083 Write_Str ("install private withed unit ");
5085 Write_Str ("install withed unit ");
5088 Write_Name (Chars (Uname));
5092 -- We do not apply the restrictions to an internal unit unless we are
5093 -- compiling the internal unit as a main unit. This check is also
5094 -- skipped for dummy units (for missing packages).
5096 if Sloc (Uname) /= No_Location
5097 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
5098 or else Current_Sem_Unit = Main_Unit)
5100 Check_Restricted_Unit
5101 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
5104 if P /= Standard_Standard then
5106 -- If the unit is not analyzed after analysis of the with clause and
5107 -- it is an instantiation then it awaits a body and is the main unit.
5108 -- Its appearance in the context of some other unit indicates a
5109 -- circular dependency (DEC suite perversity).
5111 if not Analyzed (Uname)
5112 and then Nkind (Parent (Uname)) = N_Package_Instantiation
5115 ("instantiation depends on itself", Name (With_Clause));
5117 elsif not Is_Visible_Lib_Unit (Uname) then
5119 -- Abandon processing in case of previous errors
5121 if No (Scope (Uname)) then
5122 Check_Error_Detected;
5126 Set_Is_Visible_Lib_Unit (Uname);
5128 -- If the child unit appears in the context of its parent, it is
5129 -- immediately visible.
5131 if In_Open_Scopes (Scope (Uname)) then
5132 Set_Is_Immediately_Visible (Uname);
5135 if Is_Generic_Instance (Uname)
5136 and then Ekind (Uname) in Subprogram_Kind
5138 -- Set flag as well on the visible entity that denotes the
5139 -- instance, which renames the current one.
5141 Set_Is_Visible_Lib_Unit
5143 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
5146 -- The parent unit may have been installed already, and may have
5147 -- appeared in a use clause.
5149 if In_Use (Scope (Uname)) then
5150 Set_Is_Potentially_Use_Visible (Uname);
5153 Set_Context_Installed (With_Clause);
5156 elsif not Is_Immediately_Visible (Uname) then
5157 Set_Is_Visible_Lib_Unit (Uname);
5159 if not Private_Present (With_Clause) or else Private_With_OK then
5160 Set_Is_Immediately_Visible (Uname);
5163 Set_Context_Installed (With_Clause);
5166 -- A with-clause overrides a with-type clause: there are no restric-
5167 -- tions on the use of package entities.
5169 if Ekind (Uname) = E_Package then
5170 Set_From_With_Type (Uname, False);
5173 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
5174 -- unit if there is a visible homograph for it declared in the same
5175 -- declarative region. This pathological case can only arise when an
5176 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
5177 -- G1 has a generic child also named G2, and the context includes with_
5178 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
5179 -- of I1.G2 visible as well. If the child unit is named Standard, do
5180 -- not apply the check to the Standard package itself.
5182 if Is_Child_Unit (Uname)
5183 and then Is_Visible_Lib_Unit (Uname)
5184 and then Ada_Version >= Ada_2005
5187 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
5193 U2 := Homonym (Uname);
5195 and then U2 /= Standard_Standard
5198 Decl2 := Unit_Declaration_Node (P2);
5200 if Is_Child_Unit (U2) and then Is_Visible_Lib_Unit (U2) then
5201 if Is_Generic_Instance (P)
5202 and then Nkind (Decl1) = N_Package_Declaration
5203 and then Generic_Parent (Specification (Decl1)) = P2
5205 Error_Msg_N ("illegal with_clause", With_Clause);
5207 ("\child unit has visible homograph" &
5208 " (RM 8.3(26), 10.1.1(19))",
5212 elsif Is_Generic_Instance (P2)
5213 and then Nkind (Decl2) = N_Package_Declaration
5214 and then Generic_Parent (Specification (Decl2)) = P
5216 -- With_clause for child unit of instance appears before
5217 -- in the context. We want to place the error message on
5218 -- it, not on the generic child unit itself.
5221 Prev_Clause : Node_Id;
5224 Prev_Clause := First (List_Containing (With_Clause));
5225 while Entity (Name (Prev_Clause)) /= U2 loop
5229 pragma Assert (Present (Prev_Clause));
5230 Error_Msg_N ("illegal with_clause", Prev_Clause);
5232 ("\child unit has visible homograph" &
5233 " (RM 8.3(26), 10.1.1(19))",
5244 end Install_Withed_Unit;
5250 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
5251 K : constant Node_Kind := Nkind (Lib_Unit);
5254 return (K in N_Generic_Declaration or else
5255 K in N_Generic_Instantiation or else
5256 K in N_Generic_Renaming_Declaration or else
5257 K = N_Package_Declaration or else
5258 K = N_Package_Renaming_Declaration or else
5259 K = N_Subprogram_Declaration or else
5260 K = N_Subprogram_Renaming_Declaration)
5261 and then Present (Parent_Spec (Lib_Unit));
5264 ------------------------------------
5265 -- Is_Legal_Shadow_Entity_In_Body --
5266 ------------------------------------
5268 function Is_Legal_Shadow_Entity_In_Body (T : Entity_Id) return Boolean is
5269 C_Unit : constant Node_Id := Cunit (Current_Sem_Unit);
5271 return Nkind (Unit (C_Unit)) = N_Package_Body
5274 (C_Unit, Cunit_Entity (Get_Source_Unit (Non_Limited_View (T))));
5275 end Is_Legal_Shadow_Entity_In_Body;
5277 ----------------------
5278 -- Is_Ancestor_Unit --
5279 ----------------------
5281 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean is
5282 E1 : constant Entity_Id := Defining_Entity (Unit (U1));
5285 if Nkind_In (Unit (U2), N_Package_Body, N_Subprogram_Body) then
5286 E2 := Defining_Entity (Unit (Library_Unit (U2)));
5287 return Is_Ancestor_Package (E1, E2);
5291 end Is_Ancestor_Unit;
5293 -----------------------
5294 -- Load_Needed_Body --
5295 -----------------------
5297 -- N is a generic unit named in a with clause, or else it is a unit that
5298 -- contains a generic unit or an inlined function. In order to perform an
5299 -- instantiation, the body of the unit must be present. If the unit itself
5300 -- is generic, we assume that an instantiation follows, and load & analyze
5301 -- the body unconditionally. This forces analysis of the spec as well.
5303 -- If the unit is not generic, but contains a generic unit, it is loaded on
5304 -- demand, at the point of instantiation (see ch12).
5306 procedure Load_Needed_Body
5309 Do_Analyze : Boolean := True)
5311 Body_Name : Unit_Name_Type;
5312 Unum : Unit_Number_Type;
5314 Save_Style_Check : constant Boolean := Opt.Style_Check;
5315 -- The loading and analysis is done with style checks off
5318 if not GNAT_Mode then
5319 Style_Check := False;
5322 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
5325 (Load_Name => Body_Name,
5331 if Unum = No_Unit then
5335 Compiler_State := Analyzing; -- reset after load
5337 if not Fatal_Error (Unum) or else Try_Semantics then
5338 if Debug_Flag_L then
5339 Write_Str ("*** Loaded generic body");
5344 Semantics (Cunit (Unum));
5351 Style_Check := Save_Style_Check;
5352 end Load_Needed_Body;
5354 -------------------------
5355 -- Build_Limited_Views --
5356 -------------------------
5358 procedure Build_Limited_Views (N : Node_Id) is
5359 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
5360 P : constant Entity_Id := Cunit_Entity (Unum);
5362 Spec : Node_Id; -- To denote a package specification
5363 Lim_Typ : Entity_Id; -- To denote shadow entities
5364 Comp_Typ : Entity_Id; -- To denote real entities
5366 Lim_Header : Entity_Id; -- Package entity
5367 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
5368 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
5370 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id);
5371 -- Add attributes of an incomplete type to a shadow entity. The same
5372 -- attributes are placed on the real entity, so that gigi receives
5373 -- a consistent view.
5375 procedure Decorate_Package_Specification (P : Entity_Id);
5376 -- Add attributes of a package entity to the entity in a package
5379 procedure Decorate_Tagged_Type
5383 Mark : Boolean := False);
5384 -- Set basic attributes of tagged type T, including its class-wide type.
5385 -- The parameters Loc, Scope are used to decorate the class-wide type.
5386 -- Use flag Mark to label the class-wide type as Materialize_Entity.
5388 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id);
5389 -- Construct list of shadow entities and attach it to entity of
5390 -- package that is mentioned in a limited_with clause.
5392 function New_Internal_Shadow_Entity
5393 (Kind : Entity_Kind;
5394 Sloc_Value : Source_Ptr;
5395 Id_Char : Character) return Entity_Id;
5396 -- Build a new internal entity and append it to the list of shadow
5397 -- entities available through the limited-header
5403 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id) is
5404 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
5405 Is_Tagged : Boolean;
5410 while Present (Decl) loop
5412 -- For each library_package_declaration in the environment, there
5413 -- is an implicit declaration of a *limited view* of that library
5414 -- package. The limited view of a package contains:
5416 -- * For each nested package_declaration, a declaration of the
5417 -- limited view of that package, with the same defining-
5418 -- program-unit name.
5420 -- * For each type_declaration in the visible part, an incomplete
5421 -- type-declaration with the same defining_identifier, whose
5422 -- completion is the type_declaration. If the type_declaration
5423 -- is tagged, then the incomplete_type_declaration is tagged
5426 -- The partial view is tagged if the declaration has the
5427 -- explicit keyword, or else if it is a type extension, both
5428 -- of which can be ascertained syntactically.
5430 if Nkind (Decl) = N_Full_Type_Declaration then
5432 (Nkind (Type_Definition (Decl)) = N_Record_Definition
5433 and then Tagged_Present (Type_Definition (Decl)))
5435 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
5438 (Record_Extension_Part (Type_Definition (Decl))));
5440 Comp_Typ := Defining_Identifier (Decl);
5442 if not Analyzed_Unit then
5444 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5446 Decorate_Incomplete_Type (Comp_Typ, Scope);
5450 -- Create shadow entity for type
5453 New_Internal_Shadow_Entity
5454 (Kind => Ekind (Comp_Typ),
5455 Sloc_Value => Sloc (Comp_Typ),
5458 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5459 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5460 Set_From_With_Type (Lim_Typ);
5463 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5465 Decorate_Incomplete_Type (Lim_Typ, Scope);
5468 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5469 Set_Private_Dependents (Lim_Typ, New_Elmt_List);
5471 elsif Nkind_In (Decl, N_Private_Type_Declaration,
5472 N_Incomplete_Type_Declaration,
5473 N_Task_Type_Declaration,
5474 N_Protected_Type_Declaration)
5476 Comp_Typ := Defining_Identifier (Decl);
5479 Nkind_In (Decl, N_Private_Type_Declaration,
5480 N_Incomplete_Type_Declaration)
5481 and then Tagged_Present (Decl);
5483 if not Analyzed_Unit then
5485 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5487 Decorate_Incomplete_Type (Comp_Typ, Scope);
5492 New_Internal_Shadow_Entity
5493 (Kind => Ekind (Comp_Typ),
5494 Sloc_Value => Sloc (Comp_Typ),
5497 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5498 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5499 Set_From_With_Type (Lim_Typ);
5502 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5504 Decorate_Incomplete_Type (Lim_Typ, Scope);
5507 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5509 -- Initialize Private_Depedents, so the field has the proper
5510 -- type, even though the list will remain empty.
5512 Set_Private_Dependents (Lim_Typ, New_Elmt_List);
5514 elsif Nkind (Decl) = N_Private_Extension_Declaration then
5515 Comp_Typ := Defining_Identifier (Decl);
5517 if not Analyzed_Unit then
5518 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5521 -- Create shadow entity for type
5524 New_Internal_Shadow_Entity
5525 (Kind => Ekind (Comp_Typ),
5526 Sloc_Value => Sloc (Comp_Typ),
5529 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5530 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5531 Set_From_With_Type (Lim_Typ);
5533 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5534 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5536 elsif Nkind (Decl) = N_Package_Declaration then
5541 Spec : constant Node_Id := Specification (Decl);
5544 Comp_Typ := Defining_Unit_Name (Spec);
5546 if not Analyzed (Cunit (Unum)) then
5547 Decorate_Package_Specification (Comp_Typ);
5548 Set_Scope (Comp_Typ, Scope);
5552 New_Internal_Shadow_Entity
5553 (Kind => Ekind (Comp_Typ),
5554 Sloc_Value => Sloc (Comp_Typ),
5557 Decorate_Package_Specification (Lim_Typ);
5558 Set_Scope (Lim_Typ, Scope);
5560 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5561 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5562 Set_From_With_Type (Lim_Typ);
5564 -- Note: The non_limited_view attribute is not used
5565 -- for local packages.
5569 First_Decl => First (Visible_Declarations (Spec)));
5577 ------------------------------
5578 -- Decorate_Incomplete_Type --
5579 ------------------------------
5581 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id) is
5583 Set_Ekind (E, E_Incomplete_Type);
5584 Set_Scope (E, Scop);
5586 Set_Is_First_Subtype (E, True);
5587 Set_Stored_Constraint (E, No_Elist);
5588 Set_Full_View (E, Empty);
5589 Init_Size_Align (E);
5590 end Decorate_Incomplete_Type;
5592 --------------------------
5593 -- Decorate_Tagged_Type --
5594 --------------------------
5596 procedure Decorate_Tagged_Type
5600 Mark : Boolean := False)
5605 Decorate_Incomplete_Type (T, Scop);
5606 Set_Is_Tagged_Type (T);
5608 -- Build corresponding class_wide type, if not previously done
5610 -- Note: The class-wide entity is shared by the limited-view
5611 -- and the full-view.
5613 if No (Class_Wide_Type (T)) then
5614 CW := New_External_Entity (E_Void, Scope (T), Loc, T, 'C', 0, 'T');
5616 -- Set parent to be the same as the parent of the tagged type.
5617 -- We need a parent field set, and it is supposed to point to
5618 -- the declaration of the type. The tagged type declaration
5619 -- essentially declares two separate types, the tagged type
5620 -- itself and the corresponding class-wide type, so it is
5621 -- reasonable for the parent fields to point to the declaration
5624 Set_Parent (CW, Parent (T));
5626 -- Set remaining fields of classwide type
5628 Set_Ekind (CW, E_Class_Wide_Type);
5630 Set_Scope (CW, Scop);
5631 Set_Is_Tagged_Type (CW);
5632 Set_Is_First_Subtype (CW, True);
5633 Init_Size_Align (CW);
5634 Set_Has_Unknown_Discriminants (CW, True);
5635 Set_Class_Wide_Type (CW, CW);
5636 Set_Equivalent_Type (CW, Empty);
5637 Set_From_With_Type (CW, From_With_Type (T));
5638 Set_Materialize_Entity (CW, Mark);
5640 -- Link type to its class-wide type
5642 Set_Class_Wide_Type (T, CW);
5644 end Decorate_Tagged_Type;
5646 ------------------------------------
5647 -- Decorate_Package_Specification --
5648 ------------------------------------
5650 procedure Decorate_Package_Specification (P : Entity_Id) is
5652 -- Place only the most basic attributes
5654 Set_Ekind (P, E_Package);
5655 Set_Etype (P, Standard_Void_Type);
5656 end Decorate_Package_Specification;
5658 --------------------------------
5659 -- New_Internal_Shadow_Entity --
5660 --------------------------------
5662 function New_Internal_Shadow_Entity
5663 (Kind : Entity_Kind;
5664 Sloc_Value : Source_Ptr;
5665 Id_Char : Character) return Entity_Id
5667 E : constant Entity_Id := Make_Temporary (Sloc_Value, Id_Char);
5670 Set_Ekind (E, Kind);
5671 Set_Is_Internal (E, True);
5673 if Kind in Type_Kind then
5674 Init_Size_Align (E);
5677 Append_Entity (E, Lim_Header);
5680 end New_Internal_Shadow_Entity;
5682 -- Start of processing for Build_Limited_Views
5685 pragma Assert (Limited_Present (N));
5687 -- A library_item mentioned in a limited_with_clause is a package
5688 -- declaration, not a subprogram declaration, generic declaration,
5689 -- generic instantiation, or package renaming declaration.
5691 case Nkind (Unit (Library_Unit (N))) is
5692 when N_Package_Declaration =>
5695 when N_Subprogram_Declaration =>
5696 Error_Msg_N ("subprograms not allowed in "
5697 & "limited with_clauses", N);
5700 when N_Generic_Package_Declaration |
5701 N_Generic_Subprogram_Declaration =>
5702 Error_Msg_N ("generics not allowed in "
5703 & "limited with_clauses", N);
5706 when N_Generic_Instantiation =>
5707 Error_Msg_N ("generic instantiations not allowed in "
5708 & "limited with_clauses", N);
5711 when N_Generic_Renaming_Declaration =>
5712 Error_Msg_N ("generic renamings not allowed in "
5713 & "limited with_clauses", N);
5716 when N_Subprogram_Renaming_Declaration =>
5717 Error_Msg_N ("renamed subprograms not allowed in "
5718 & "limited with_clauses", N);
5721 when N_Package_Renaming_Declaration =>
5722 Error_Msg_N ("renamed packages not allowed in "
5723 & "limited with_clauses", N);
5727 raise Program_Error;
5730 -- The limited unit is not analyzed but the with clause must be
5731 -- minimally decorated so that checks on unused with clause also work
5732 -- with limited with clauses.
5734 if Is_Entity_Name (Name (N)) then
5735 Set_Entity (Name (N), P);
5737 elsif Nkind (Name (N)) = N_Selected_Component then
5738 Set_Entity (Selector_Name (Name (N)), P);
5741 -- Check if the chain is already built
5743 Spec := Specification (Unit (Library_Unit (N)));
5745 if Limited_View_Installed (Spec) then
5749 Set_Ekind (P, E_Package);
5751 -- Build the header of the limited_view
5753 Lim_Header := Make_Temporary (Sloc (N), 'Z');
5754 Set_Ekind (Lim_Header, E_Package);
5755 Set_Is_Internal (Lim_Header);
5756 Set_Limited_View (P, Lim_Header);
5758 -- Create the auxiliary chain. All the shadow entities are appended to
5759 -- the list of entities of the limited-view header
5763 First_Decl => First (Visible_Declarations (Spec)));
5765 -- Save the last built shadow entity. It is needed later to set the
5766 -- reference to the first shadow entity in the private part
5768 Last_Pub_Lim_E := Last_Lim_E;
5770 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5771 -- Required to give support to limited-private-with clauses
5773 Build_Chain (Scope => P,
5774 First_Decl => First (Private_Declarations (Spec)));
5776 if Last_Pub_Lim_E /= Empty then
5777 Set_First_Private_Entity
5778 (Lim_Header, Next_Entity (Last_Pub_Lim_E));
5780 Set_First_Private_Entity
5781 (Lim_Header, First_Entity (P));
5784 Set_Limited_View_Installed (Spec);
5785 end Build_Limited_Views;
5787 -------------------------------
5788 -- Check_Body_Needed_For_SAL --
5789 -------------------------------
5791 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5793 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5794 -- Determine whether use of entity E might require the presence of its
5795 -- body. For a package this requires a recursive traversal of all nested
5798 ---------------------------
5799 -- Entity_Needed_For_SAL --
5800 ---------------------------
5802 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5806 if Is_Subprogram (E)
5807 and then Has_Pragma_Inline (E)
5811 elsif Ekind_In (E, E_Generic_Function, E_Generic_Procedure) then
5814 elsif Ekind (E) = E_Generic_Package
5816 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5817 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5821 elsif Ekind (E) = E_Package
5822 and then Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5823 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5825 Ent := First_Entity (E);
5826 while Present (Ent) loop
5827 if Entity_Needs_Body (Ent) then
5839 end Entity_Needs_Body;
5841 -- Start of processing for Check_Body_Needed_For_SAL
5844 if Ekind (Unit_Name) = E_Generic_Package
5845 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5846 N_Generic_Package_Declaration
5848 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5850 Set_Body_Needed_For_SAL (Unit_Name);
5852 elsif Ekind_In (Unit_Name, E_Generic_Procedure, E_Generic_Function) then
5853 Set_Body_Needed_For_SAL (Unit_Name);
5855 elsif Is_Subprogram (Unit_Name)
5856 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5857 N_Subprogram_Declaration
5858 and then Has_Pragma_Inline (Unit_Name)
5860 Set_Body_Needed_For_SAL (Unit_Name);
5862 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5863 Check_Body_Needed_For_SAL
5864 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5866 elsif Ekind (Unit_Name) = E_Package
5867 and then Entity_Needs_Body (Unit_Name)
5869 Set_Body_Needed_For_SAL (Unit_Name);
5871 elsif Ekind (Unit_Name) = E_Package_Body
5872 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5874 Check_Body_Needed_For_SAL
5875 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5877 end Check_Body_Needed_For_SAL;
5879 --------------------
5880 -- Remove_Context --
5881 --------------------
5883 procedure Remove_Context (N : Node_Id) is
5884 Lib_Unit : constant Node_Id := Unit (N);
5887 -- If this is a child unit, first remove the parent units
5889 if Is_Child_Spec (Lib_Unit) then
5890 Remove_Parents (Lib_Unit);
5893 Remove_Context_Clauses (N);
5896 ----------------------------
5897 -- Remove_Context_Clauses --
5898 ----------------------------
5900 procedure Remove_Context_Clauses (N : Node_Id) is
5902 Unit_Name : Entity_Id;
5905 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5906 -- limited-views first and regular-views later (to maintain the
5909 -- First Phase: Remove limited_with context clauses
5911 Item := First (Context_Items (N));
5912 while Present (Item) loop
5914 -- We are interested only in with clauses which got installed
5917 if Nkind (Item) = N_With_Clause
5918 and then Limited_Present (Item)
5919 and then Limited_View_Installed (Item)
5921 Remove_Limited_With_Clause (Item);
5927 -- Second Phase: Loop through context items and undo regular
5928 -- with_clauses and use_clauses.
5930 Item := First (Context_Items (N));
5931 while Present (Item) loop
5933 -- We are interested only in with clauses which got installed on
5934 -- entry, as indicated by their Context_Installed flag set
5936 if Nkind (Item) = N_With_Clause
5937 and then Limited_Present (Item)
5938 and then Limited_View_Installed (Item)
5942 elsif Nkind (Item) = N_With_Clause
5943 and then Context_Installed (Item)
5945 -- Remove items from one with'ed unit
5947 Unit_Name := Entity (Name (Item));
5948 Remove_Unit_From_Visibility (Unit_Name);
5949 Set_Context_Installed (Item, False);
5951 elsif Nkind (Item) = N_Use_Package_Clause then
5952 End_Use_Package (Item);
5954 elsif Nkind (Item) = N_Use_Type_Clause then
5955 End_Use_Type (Item);
5960 end Remove_Context_Clauses;
5962 --------------------------------
5963 -- Remove_Limited_With_Clause --
5964 --------------------------------
5966 procedure Remove_Limited_With_Clause (N : Node_Id) is
5967 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5970 Lim_Header : Entity_Id;
5971 Lim_Typ : Entity_Id;
5975 pragma Assert (Limited_View_Installed (N));
5977 -- In case of limited with_clause on subprograms, generics, instances,
5978 -- or renamings, the corresponding error was previously posted and we
5979 -- have nothing to do here.
5981 if Nkind (P_Unit) /= N_Package_Declaration then
5985 P := Defining_Unit_Name (Specification (P_Unit));
5987 -- Handle child packages
5989 if Nkind (P) = N_Defining_Program_Unit_Name then
5990 P := Defining_Identifier (P);
5993 if Debug_Flag_I then
5994 Write_Str ("remove limited view of ");
5995 Write_Name (Chars (P));
5996 Write_Str (" from visibility");
6000 -- Prepare the removal of the shadow entities from visibility. The first
6001 -- element of the limited view is a header (an E_Package entity) that is
6002 -- used to reference the first shadow entity in the private part of the
6005 Lim_Header := Limited_View (P);
6006 Lim_Typ := First_Entity (Lim_Header);
6008 -- Remove package and shadow entities from visibility if it has not
6011 if not Analyzed (P_Unit) then
6013 Set_Is_Immediately_Visible (P, False);
6015 while Present (Lim_Typ) loop
6017 Next_Entity (Lim_Typ);
6020 -- Otherwise this package has already appeared in the closure and its
6021 -- shadow entities must be replaced by its real entities. This code
6022 -- must be kept synchronized with the complementary code in Install
6023 -- Limited_Withed_Unit.
6026 -- Real entities that are type or subtype declarations were hidden
6027 -- from visibility at the point of installation of the limited-view.
6028 -- Now we recover the previous value of the hidden attribute.
6030 E := First_Entity (P);
6031 while Present (E) and then E /= First_Private_Entity (P) loop
6033 Set_Is_Hidden (E, Was_Hidden (E));
6039 while Present (Lim_Typ)
6040 and then Lim_Typ /= First_Private_Entity (Lim_Header)
6042 -- Nested packages and child units were not unchained
6044 if Ekind (Lim_Typ) /= E_Package
6045 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
6047 -- If the package has incomplete types, the limited view of the
6048 -- incomplete type is in fact never visible (AI05-129) but we
6049 -- have created a shadow entity E1 for it, that points to E2,
6050 -- a non-limited incomplete type. This in turn has a full view
6051 -- E3 that is the full declaration. There is a corresponding
6052 -- shadow entity E4. When reinstalling the non-limited view,
6053 -- E2 must become the current entity and E3 must be ignored.
6055 E := Non_Limited_View (Lim_Typ);
6057 if Present (Current_Entity (E))
6058 and then Ekind (Current_Entity (E)) = E_Incomplete_Type
6059 and then Full_View (Current_Entity (E)) = E
6062 -- Lim_Typ is the limited view of a full type declaration
6063 -- that has a previous incomplete declaration, i.e. E3 from
6064 -- the previous description. Nothing to insert.
6069 pragma Assert (not In_Chain (E));
6071 Prev := Current_Entity (Lim_Typ);
6073 if Prev = Lim_Typ then
6074 Set_Current_Entity (E);
6077 while Present (Prev)
6078 and then Homonym (Prev) /= Lim_Typ
6080 Prev := Homonym (Prev);
6083 if Present (Prev) then
6084 Set_Homonym (Prev, E);
6088 -- Preserve structure of homonym chain
6090 Set_Homonym (E, Homonym (Lim_Typ));
6094 Next_Entity (Lim_Typ);
6098 -- Indicate that the limited view of the package is not installed
6100 Set_From_With_Type (P, False);
6101 Set_Limited_View_Installed (N, False);
6102 end Remove_Limited_With_Clause;
6104 --------------------
6105 -- Remove_Parents --
6106 --------------------
6108 procedure Remove_Parents (Lib_Unit : Node_Id) is
6111 P_Spec : Node_Id := Empty;
6113 Vis : constant Boolean :=
6114 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
6117 if Is_Child_Spec (Lib_Unit) then
6118 P_Spec := Parent_Spec (Lib_Unit);
6120 elsif Nkind (Lib_Unit) = N_Package_Body
6121 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
6123 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
6126 if Present (P_Spec) then
6128 P_Name := Get_Parent_Entity (P);
6129 Remove_Context_Clauses (P_Spec);
6130 End_Package_Scope (P_Name);
6131 Set_Is_Immediately_Visible (P_Name, Vis);
6133 -- Remove from visibility the siblings as well, which are directly
6134 -- visible while the parent is in scope.
6136 E := First_Entity (P_Name);
6137 while Present (E) loop
6138 if Is_Child_Unit (E) then
6139 Set_Is_Immediately_Visible (E, False);
6145 Set_In_Package_Body (P_Name, False);
6147 -- This is the recursive call to remove the context of any higher
6148 -- level parent. This recursion ensures that all parents are removed
6149 -- in the reverse order of their installation.
6155 ---------------------------------
6156 -- Remove_Private_With_Clauses --
6157 ---------------------------------
6159 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
6162 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
6163 -- Check whether a given unit appears in a regular with_clause. Used to
6164 -- determine whether a private_with_clause, implicit or explicit, should
6167 ----------------------------
6168 -- In_Regular_With_Clause --
6169 ----------------------------
6171 function In_Regular_With_Clause (E : Entity_Id) return Boolean
6176 Item := First (Context_Items (Comp_Unit));
6177 while Present (Item) loop
6178 if Nkind (Item) = N_With_Clause
6179 and then Entity (Name (Item)) = E
6180 and then not Private_Present (Item)
6188 end In_Regular_With_Clause;
6190 -- Start of processing for Remove_Private_With_Clauses
6193 Item := First (Context_Items (Comp_Unit));
6194 while Present (Item) loop
6195 if Nkind (Item) = N_With_Clause
6196 and then Private_Present (Item)
6198 -- If private_with_clause is redundant, remove it from context,
6199 -- as a small optimization to subsequent handling of private_with
6200 -- clauses in other nested packages.
6202 if In_Regular_With_Clause (Entity (Name (Item))) then
6204 Nxt : constant Node_Id := Next (Item);
6210 elsif Limited_Present (Item) then
6211 if not Limited_View_Installed (Item) then
6212 Remove_Limited_With_Clause (Item);
6218 Remove_Unit_From_Visibility (Entity (Name (Item)));
6219 Set_Context_Installed (Item, False);
6227 end Remove_Private_With_Clauses;
6229 ---------------------------------
6230 -- Remove_Unit_From_Visibility --
6231 ---------------------------------
6233 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
6235 if Debug_Flag_I then
6236 Write_Str ("remove unit ");
6237 Write_Name (Chars (Unit_Name));
6238 Write_Str (" from visibility");
6242 Set_Is_Visible_Lib_Unit (Unit_Name, False);
6243 Set_Is_Potentially_Use_Visible (Unit_Name, False);
6244 Set_Is_Immediately_Visible (Unit_Name, False);
6246 -- If the unit is a wrapper package, the subprogram instance is
6247 -- what must be removed from visibility.
6249 if Is_Wrapper_Package (Unit_Name) then
6250 Set_Is_Immediately_Visible (Current_Entity (Unit_Name), False);
6252 end Remove_Unit_From_Visibility;
6267 procedure Unchain (E : Entity_Id) is
6271 Prev := Current_Entity (E);
6277 Set_Name_Entity_Id (Chars (E), Homonym (E));
6280 while Present (Prev)
6281 and then Homonym (Prev) /= E
6283 Prev := Homonym (Prev);
6286 if Present (Prev) then
6287 Set_Homonym (Prev, Homonym (E));
6291 if Debug_Flag_I then
6292 Write_Str (" (homonym) unchain ");
6293 Write_Name (Chars (E));
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