1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2012, 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_Child_Spec (Lib_Unit : Node_Id) return Boolean;
168 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
169 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
170 -- a library spec that has a parent. If the call to Is_Child_Spec returns
171 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
172 -- compilation unit for the parent spec.
174 -- Lib_Unit can also be a subprogram body that acts as its own spec. If the
175 -- Parent_Spec is non-empty, this is also a child unit.
177 procedure Remove_Context_Clauses (N : Node_Id);
178 -- Subsidiary of previous one. Remove use_ and with_clauses
180 procedure Remove_Limited_With_Clause (N : Node_Id);
181 -- Remove from visibility the shadow entities introduced for a package
182 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
184 procedure Remove_Parents (Lib_Unit : Node_Id);
185 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
186 -- contexts established by the corresponding call to Install_Parents are
187 -- removed. Remove_Parents contains a recursive call to itself to ensure
188 -- that all parents are removed in the nested case.
190 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id);
191 -- Reset all visibility flags on unit after compiling it, either as a main
192 -- unit or as a unit in the context.
194 procedure Unchain (E : Entity_Id);
195 -- Remove single entity from visibility list
197 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id);
198 -- Common processing for all stubs (subprograms, tasks, packages, and
199 -- protected cases). N is the stub to be analyzed. Once the subunit name
200 -- is established, load and analyze. Nam is the non-overloadable entity
201 -- for which the proper body provides a completion. Subprogram stubs are
202 -- handled differently because they can be declarations.
205 -- A dummy procedure, for debugging use, called just before analyzing the
206 -- main unit (after dealing with any context clauses).
208 --------------------------
209 -- Limited_With_Clauses --
210 --------------------------
212 -- Limited_With clauses are the mechanism chosen for Ada 2005 to support
213 -- mutually recursive types declared in different units. A limited_with
214 -- clause that names package P in the context of unit U makes the types
215 -- declared in the visible part of P available within U, but with the
216 -- restriction that these types can only be used as incomplete types.
217 -- The limited_with clause does not impose a semantic dependence on P,
218 -- and it is possible for two packages to have limited_with_clauses on
219 -- each other without creating an elaboration circularity.
221 -- To support this feature, the analysis of a limited_with clause must
222 -- create an abbreviated view of the package, without performing any
223 -- semantic analysis on it. This "package abstract" contains shadow types
224 -- that are in one-one correspondence with the real types in the package,
225 -- and that have the properties of incomplete types.
227 -- The implementation creates two element lists: one to chain the shadow
228 -- entities, and one to chain the corresponding type entities in the tree
229 -- of the package. Links between corresponding entities in both chains
230 -- allow the compiler to select the proper view of a given type, depending
231 -- on the context. Note that in contrast with the handling of private
232 -- types, the limited view and the non-limited view of a type are treated
233 -- as separate entities, and no entity exchange needs to take place, which
234 -- makes the implementation must simpler than could be feared.
236 ------------------------------
237 -- Analyze_Compilation_Unit --
238 ------------------------------
240 procedure Analyze_Compilation_Unit (N : Node_Id) is
241 Unit_Node : constant Node_Id := Unit (N);
242 Lib_Unit : Node_Id := Library_Unit (N);
244 Main_Cunit : constant Node_Id := Cunit (Main_Unit);
245 Par_Spec_Name : Unit_Name_Type;
246 Unum : Unit_Number_Type;
248 procedure Check_Redundant_Withs
249 (Context_Items : List_Id;
250 Spec_Context_Items : List_Id := No_List);
251 -- Determine whether the context list of a compilation unit contains
252 -- redundant with clauses. When checking body clauses against spec
253 -- clauses, set Context_Items to the context list of the body and
254 -- Spec_Context_Items to that of the spec. Parent packages are not
255 -- examined for documentation purposes.
257 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id);
258 -- Generate cross-reference information for the parents of child units.
259 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
261 ---------------------------
262 -- Check_Redundant_Withs --
263 ---------------------------
265 procedure Check_Redundant_Withs
266 (Context_Items : List_Id;
267 Spec_Context_Items : List_Id := No_List)
271 procedure Process_Body_Clauses
272 (Context_List : List_Id;
274 Used : in out Boolean;
275 Used_Type_Or_Elab : in out Boolean);
276 -- Examine the context clauses of a package body, trying to match the
277 -- name entity of Clause with any list element. If the match occurs
278 -- on a use package clause set Used to True, for a use type clause or
279 -- pragma Elaborate[_All], set Used_Type_Or_Elab to True.
281 procedure Process_Spec_Clauses
282 (Context_List : List_Id;
284 Used : in out Boolean;
285 Withed : in out Boolean;
286 Exit_On_Self : Boolean := False);
287 -- Examine the context clauses of a package spec, trying to match
288 -- the name entity of Clause with any list element. If the match
289 -- occurs on a use package clause, set Used to True, for a with
290 -- package clause other than Clause, set Withed to True. Limited
291 -- with clauses, implicitly generated with clauses and withs
292 -- having pragmas Elaborate or Elaborate_All applied to them are
293 -- skipped. Exit_On_Self is used to control the search loop and
294 -- force an exit whenever Clause sees itself in the search.
296 --------------------------
297 -- Process_Body_Clauses --
298 --------------------------
300 procedure Process_Body_Clauses
301 (Context_List : List_Id;
303 Used : in out Boolean;
304 Used_Type_Or_Elab : in out Boolean)
306 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
312 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean;
313 -- In an expanded name in a use clause, if the prefix is a renamed
314 -- package, the entity is set to the original package as a result,
315 -- when checking whether the package appears in a previous with
316 -- clause, the renaming has to be taken into account, to prevent
317 -- spurious/incorrect warnings. A common case is use of Text_IO.
323 function Same_Unit (N : Node_Id; P : Entity_Id) return Boolean is
325 return Entity (N) = P
327 (Present (Renamed_Object (P))
328 and then Entity (N) = Renamed_Object (P));
331 -- Start of processing for Process_Body_Clauses
335 Used_Type_Or_Elab := False;
337 Cont_Item := First (Context_List);
338 while Present (Cont_Item) loop
340 -- Package use clause
342 if Nkind (Cont_Item) = N_Use_Package_Clause
345 -- Search through use clauses
347 Use_Item := First (Names (Cont_Item));
348 while Present (Use_Item) and then not Used loop
350 -- Case of a direct use of the one we are looking for
352 if Entity (Use_Item) = Nam_Ent then
355 -- Handle nested case, as in "with P; use P.Q.R"
362 -- Loop through prefixes looking for match
365 while Nkind (UE) = N_Expanded_Name loop
366 if Same_Unit (Prefix (UE), Nam_Ent) then
381 elsif Nkind (Cont_Item) = N_Use_Type_Clause
382 and then not Used_Type_Or_Elab
384 Subt_Mark := First (Subtype_Marks (Cont_Item));
385 while Present (Subt_Mark)
386 and then not Used_Type_Or_Elab
388 if Same_Unit (Prefix (Subt_Mark), Nam_Ent) then
389 Used_Type_Or_Elab := True;
395 -- Pragma Elaborate or Elaborate_All
397 elsif Nkind (Cont_Item) = N_Pragma
399 (Pragma_Name (Cont_Item) = Name_Elaborate
401 Pragma_Name (Cont_Item) = Name_Elaborate_All)
402 and then not Used_Type_Or_Elab
405 First (Pragma_Argument_Associations (Cont_Item));
406 while Present (Prag_Unit)
407 and then not Used_Type_Or_Elab
409 if Entity (Expression (Prag_Unit)) = Nam_Ent then
410 Used_Type_Or_Elab := True;
419 end Process_Body_Clauses;
421 --------------------------
422 -- Process_Spec_Clauses --
423 --------------------------
425 procedure Process_Spec_Clauses
426 (Context_List : List_Id;
428 Used : in out Boolean;
429 Withed : in out Boolean;
430 Exit_On_Self : Boolean := False)
432 Nam_Ent : constant Entity_Id := Entity (Name (Clause));
440 Cont_Item := First (Context_List);
441 while Present (Cont_Item) loop
443 -- Stop the search since the context items after Cont_Item have
444 -- already been examined in a previous iteration of the reverse
445 -- loop in Check_Redundant_Withs.
448 and Cont_Item = Clause
453 -- Package use clause
455 if Nkind (Cont_Item) = N_Use_Package_Clause
458 Use_Item := First (Names (Cont_Item));
459 while Present (Use_Item) and then not Used loop
460 if Entity (Use_Item) = Nam_Ent then
467 -- Package with clause. Avoid processing self, implicitly
468 -- generated with clauses or limited with clauses. Note that
469 -- we examine with clauses having pragmas Elaborate or
470 -- Elaborate_All applied to them due to cases such as:
474 -- pragma Elaborate (Pack);
476 -- In this case, the second with clause is redundant since
477 -- the pragma applies only to the first "with Pack;".
479 elsif Nkind (Cont_Item) = N_With_Clause
480 and then not Implicit_With (Cont_Item)
481 and then not Limited_Present (Cont_Item)
482 and then Cont_Item /= Clause
483 and then Entity (Name (Cont_Item)) = Nam_Ent
490 end Process_Spec_Clauses;
492 -- Start of processing for Check_Redundant_Withs
495 Clause := Last (Context_Items);
496 while Present (Clause) loop
498 -- Avoid checking implicitly generated with clauses, limited with
499 -- clauses or withs that have pragma Elaborate or Elaborate_All.
501 if Nkind (Clause) = N_With_Clause
502 and then not Implicit_With (Clause)
503 and then not Limited_Present (Clause)
504 and then not Elaborate_Present (Clause)
506 -- Package body-to-spec check
508 if Present (Spec_Context_Items) then
510 Used_In_Body : Boolean := False;
511 Used_In_Spec : Boolean := False;
512 Used_Type_Or_Elab : Boolean := False;
513 Withed_In_Spec : Boolean := False;
517 (Context_List => Spec_Context_Items,
519 Used => Used_In_Spec,
520 Withed => Withed_In_Spec);
523 (Context_List => Context_Items,
525 Used => Used_In_Body,
526 Used_Type_Or_Elab => Used_Type_Or_Elab);
528 -- "Type Elab" refers to the presence of either a use
529 -- type clause, pragmas Elaborate or Elaborate_All.
531 -- +---------------+---------------------------+------+
532 -- | Spec | Body | Warn |
533 -- +--------+------+--------+------+-----------+------+
534 -- | Withed | Used | Withed | Used | Type Elab | |
535 -- | X | | X | | | X |
536 -- | X | | X | X | | |
537 -- | X | | X | | X | |
538 -- | X | | X | X | X | |
539 -- | X | X | X | | | X |
540 -- | X | X | X | | X | |
541 -- | X | X | X | X | | X |
542 -- | X | X | X | X | X | |
543 -- +--------+------+--------+------+-----------+------+
546 and then not Used_Type_Or_Elab)
549 and then not Used_In_Body)
553 Error_Msg_N -- CODEFIX
554 ("?redundant with clause in body", Clause);
557 Used_In_Body := False;
558 Used_In_Spec := False;
559 Used_Type_Or_Elab := False;
560 Withed_In_Spec := False;
563 -- Standalone package spec or body check
567 Dont_Care : Boolean := False;
568 Withed : Boolean := False;
571 -- The mechanism for examining the context clauses of a
572 -- package spec can be applied to package body clauses.
575 (Context_List => Context_Items,
579 Exit_On_Self => True);
582 Error_Msg_N -- CODEFIX
583 ("?redundant with clause", Clause);
591 end Check_Redundant_Withs;
593 --------------------------------
594 -- Generate_Parent_References --
595 --------------------------------
597 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is
599 P_Name : Entity_Id := P_Id;
602 Pref := Name (Parent (Defining_Entity (N)));
604 if Nkind (Pref) = N_Expanded_Name then
606 -- Done already, if the unit has been compiled indirectly as
607 -- part of the closure of its context because of inlining.
612 while Nkind (Pref) = N_Selected_Component loop
613 Change_Selected_Component_To_Expanded_Name (Pref);
614 Set_Entity (Pref, P_Name);
615 Set_Etype (Pref, Etype (P_Name));
616 Generate_Reference (P_Name, Pref, 'r');
617 Pref := Prefix (Pref);
618 P_Name := Scope (P_Name);
621 -- The guard here on P_Name is to handle the error condition where
622 -- the parent unit is missing because the file was not found.
624 if Present (P_Name) then
625 Set_Entity (Pref, P_Name);
626 Set_Etype (Pref, Etype (P_Name));
627 Generate_Reference (P_Name, Pref, 'r');
628 Style.Check_Identifier (Pref, P_Name);
630 end Generate_Parent_References;
632 -- Start of processing for Analyze_Compilation_Unit
635 Process_Compilation_Unit_Pragmas (N);
637 -- If the unit is a subunit whose parent has not been analyzed (which
638 -- indicates that the main unit is a subunit, either the current one or
639 -- one of its descendents) then the subunit is compiled as part of the
640 -- analysis of the parent, which we proceed to do. Basically this gets
641 -- handled from the top down and we don't want to do anything at this
642 -- level (i.e. this subunit will be handled on the way down from the
643 -- parent), so at this level we immediately return. If the subunit ends
644 -- up not analyzed, it means that the parent did not contain a stub for
645 -- it, or that there errors were detected in some ancestor.
647 if Nkind (Unit_Node) = N_Subunit and then not Analyzed (Lib_Unit) then
648 Semantics (Lib_Unit);
650 if not Analyzed (Proper_Body (Unit_Node)) then
651 if Serious_Errors_Detected > 0 then
652 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N);
654 Error_Msg_N ("missing stub for subunit", N);
661 -- Analyze context (this will call Sem recursively for with'ed units) To
662 -- detect circularities among with-clauses that are not caught during
663 -- loading, we set the Context_Pending flag on the current unit. If the
664 -- flag is already set there is a potential circularity. We exclude
665 -- predefined units from this check because they are known to be safe.
666 -- We also exclude package bodies that are present because circularities
667 -- between bodies are harmless (and necessary).
669 if Context_Pending (N) then
671 Circularity : Boolean := True;
674 if Is_Predefined_File_Name
675 (Unit_File_Name (Get_Source_Unit (Unit (N))))
677 Circularity := False;
680 for U in Main_Unit + 1 .. Last_Unit loop
681 if Nkind (Unit (Cunit (U))) = N_Package_Body
682 and then not Analyzed (Cunit (U))
684 Circularity := False;
691 Error_Msg_N ("circular dependency caused by with_clauses", N);
693 ("\possibly missing limited_with clause"
694 & " in one of the following", N);
696 for U in Main_Unit .. Last_Unit loop
697 if Context_Pending (Cunit (U)) then
698 Error_Msg_Unit_1 := Get_Unit_Name (Unit (Cunit (U)));
699 Error_Msg_N ("\unit$", N);
703 raise Unrecoverable_Error;
707 Set_Context_Pending (N);
712 Set_Context_Pending (N, False);
714 -- If the unit is a package body, the spec is already loaded and must be
715 -- analyzed first, before we analyze the body.
717 if Nkind (Unit_Node) = N_Package_Body then
719 -- If no Lib_Unit, then there was a serious previous error, so just
720 -- ignore the entire analysis effort
722 if No (Lib_Unit) then
726 -- Analyze the package spec
728 Semantics (Lib_Unit);
730 -- Check for unused with's
732 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
734 -- Verify that the library unit is a package declaration
736 if not Nkind_In (Unit (Lib_Unit), N_Package_Declaration,
737 N_Generic_Package_Declaration)
740 ("no legal package declaration for package body", N);
743 -- Otherwise, the entity in the declaration is visible. Update the
744 -- version to reflect dependence of this body on the spec.
747 Spec_Id := Defining_Entity (Unit (Lib_Unit));
748 Set_Is_Immediately_Visible (Spec_Id, True);
749 Version_Update (N, Lib_Unit);
751 if Nkind (Defining_Unit_Name (Unit_Node)) =
752 N_Defining_Program_Unit_Name
754 Generate_Parent_References (Unit_Node, Scope (Spec_Id));
759 -- If the unit is a subprogram body, then we similarly need to analyze
760 -- its spec. However, things are a little simpler in this case, because
761 -- here, this analysis is done mostly for error checking and consistency
762 -- purposes (but not only, e.g. there could be a contract on the spec),
763 -- so there's nothing else to be done.
765 elsif Nkind (Unit_Node) = N_Subprogram_Body then
766 if Acts_As_Spec (N) then
768 -- If the subprogram body is a child unit, we must create a
769 -- declaration for it, in order to properly load the parent(s).
770 -- After this, the original unit does not acts as a spec, because
771 -- there is an explicit one. If this unit appears in a context
772 -- clause, then an implicit with on the parent will be added when
773 -- installing the context. If this is the main unit, there is no
774 -- Unit_Table entry for the declaration (it has the unit number
775 -- of the main unit) and code generation is unaffected.
777 Unum := Get_Cunit_Unit_Number (N);
778 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum));
780 if Par_Spec_Name /= No_Unit_Name then
783 (Load_Name => Par_Spec_Name,
788 if Unum /= No_Unit then
790 -- Build subprogram declaration and attach parent unit to it
791 -- This subprogram declaration does not come from source,
792 -- Nevertheless the backend must generate debugging info for
793 -- it, and this must be indicated explicitly. We also mark
794 -- the body entity as a child unit now, to prevent a
795 -- cascaded error if the spec entity cannot be entered
796 -- in its scope. Finally we create a Units table entry for
797 -- the subprogram declaration, to maintain a one-to-one
798 -- correspondence with compilation unit nodes. This is
799 -- critical for the tree traversals performed by CodePeer.
802 Loc : constant Source_Ptr := Sloc (N);
803 SCS : constant Boolean :=
804 Get_Comes_From_Source_Default;
807 Set_Comes_From_Source_Default (False);
809 -- Checks for redundant USE TYPE clauses have a special
810 -- exception for the synthetic spec we create here. This
811 -- special case relies on the two compilation units
812 -- sharing the same context clause.
814 -- Note: We used to do a shallow copy (New_Copy_List),
815 -- which defeated those checks and also created malformed
816 -- trees (subtype mark shared by two distinct
817 -- N_Use_Type_Clause nodes) which crashed the compiler.
820 Make_Compilation_Unit (Loc,
821 Context_Items => Context_Items (N),
823 Make_Subprogram_Declaration (Sloc (N),
826 (Specification (Unit_Node))),
828 Make_Compilation_Unit_Aux (Loc));
830 Set_Library_Unit (N, Lib_Unit);
831 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum));
832 Make_Child_Decl_Unit (N);
833 Semantics (Lib_Unit);
835 -- Now that a separate declaration exists, the body
836 -- of the child unit does not act as spec any longer.
838 Set_Acts_As_Spec (N, False);
839 Set_Is_Child_Unit (Defining_Entity (Unit_Node));
840 Set_Debug_Info_Needed (Defining_Entity (Unit (Lib_Unit)));
841 Set_Comes_From_Source_Default (SCS);
846 -- Here for subprogram with separate declaration
849 Semantics (Lib_Unit);
850 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit));
851 Version_Update (N, Lib_Unit);
854 -- If this is a child unit, generate references to the parents
856 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) =
857 N_Defining_Program_Unit_Name
859 Generate_Parent_References (
860 Specification (Unit_Node),
861 Scope (Defining_Entity (Unit (Lib_Unit))));
865 -- If it is a child unit, the parent must be elaborated first and we
866 -- update version, since we are dependent on our parent.
868 if Is_Child_Spec (Unit_Node) then
870 -- The analysis of the parent is done with style checks off
873 Save_Style_Check : constant Boolean := Style_Check;
876 if not GNAT_Mode then
877 Style_Check := False;
880 Semantics (Parent_Spec (Unit_Node));
881 Version_Update (N, Parent_Spec (Unit_Node));
883 -- Restore style check settings
885 Style_Check := Save_Style_Check;
889 -- With the analysis done, install the context. Note that we can't
890 -- install the context from the with clauses as we analyze them, because
891 -- each with clause must be analyzed in a clean visibility context, so
892 -- we have to wait and install them all at once.
896 if Is_Child_Spec (Unit_Node) then
898 -- Set the entities of all parents in the program_unit_name
900 Generate_Parent_References (
901 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node))));
904 -- All components of the context: with-clauses, library unit, ancestors
905 -- if any, (and their context) are analyzed and installed.
907 -- Call special debug routine sm if this is the main unit
909 if Current_Sem_Unit = Main_Unit then
913 -- Now analyze the unit (package, subprogram spec, body) itself
917 if Warn_On_Redundant_Constructs then
918 Check_Redundant_Withs (Context_Items (N));
920 if Nkind (Unit_Node) = N_Package_Body then
921 Check_Redundant_Withs
922 (Context_Items => Context_Items (N),
923 Spec_Context_Items => Context_Items (Lib_Unit));
927 -- The above call might have made Unit_Node an N_Subprogram_Body from
928 -- something else, so propagate any Acts_As_Spec flag.
930 if Nkind (Unit_Node) = N_Subprogram_Body
931 and then Acts_As_Spec (Unit_Node)
933 Set_Acts_As_Spec (N);
936 -- Register predefined units in Rtsfind
939 Unum : constant Unit_Number_Type := Get_Source_Unit (Sloc (N));
941 if Is_Predefined_File_Name (Unit_File_Name (Unum)) then
942 Set_RTU_Loaded (Unit_Node);
946 -- Treat compilation unit pragmas that appear after the library unit
948 if Present (Pragmas_After (Aux_Decls_Node (N))) then
950 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N)));
952 while Present (Prag_Node) loop
959 -- Generate distribution stubs if requested and no error
962 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body
964 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
965 and then not Fatal_Error (Main_Unit)
967 if Is_RCI_Pkg_Spec_Or_Body (N) then
969 -- Regular RCI package
971 Add_Stub_Constructs (N);
973 elsif (Nkind (Unit_Node) = N_Package_Declaration
974 and then Is_Shared_Passive (Defining_Entity
975 (Specification (Unit_Node))))
976 or else (Nkind (Unit_Node) = N_Package_Body
978 Is_Shared_Passive (Corresponding_Spec (Unit_Node)))
980 -- Shared passive package
982 Add_Stub_Constructs (N);
984 elsif Nkind (Unit_Node) = N_Package_Instantiation
986 Is_Remote_Call_Interface
987 (Defining_Entity (Specification (Instance_Spec (Unit_Node))))
989 -- Instantiation of a RCI generic package
991 Add_Stub_Constructs (N);
995 -- Remove unit from visibility, so that environment is clean for the
996 -- next compilation, which is either the main unit or some other unit
999 if Nkind_In (Unit_Node, N_Package_Declaration,
1000 N_Package_Renaming_Declaration,
1001 N_Subprogram_Declaration)
1002 or else Nkind (Unit_Node) in N_Generic_Declaration
1004 (Nkind (Unit_Node) = N_Subprogram_Body
1005 and then Acts_As_Spec (Unit_Node))
1007 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node));
1009 -- If the unit is an instantiation whose body will be elaborated for
1010 -- inlining purposes, use the proper entity of the instance. The entity
1011 -- may be missing if the instantiation was illegal.
1013 elsif Nkind (Unit_Node) = N_Package_Instantiation
1014 and then not Error_Posted (Unit_Node)
1015 and then Present (Instance_Spec (Unit_Node))
1017 Remove_Unit_From_Visibility
1018 (Defining_Entity (Instance_Spec (Unit_Node)));
1020 elsif Nkind (Unit_Node) = N_Package_Body
1021 or else (Nkind (Unit_Node) = N_Subprogram_Body
1022 and then not Acts_As_Spec (Unit_Node))
1024 -- Bodies that are not the main unit are compiled if they are generic
1025 -- or contain generic or inlined units. Their analysis brings in the
1026 -- context of the corresponding spec (unit declaration) which must be
1027 -- removed as well, to return the compilation environment to its
1030 Remove_Context (Lib_Unit);
1031 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False);
1034 -- Last step is to deinstall the context we just installed as well as
1035 -- the unit just compiled.
1039 -- If this is the main unit and we are generating code, we must check
1040 -- that all generic units in the context have a body if they need it,
1041 -- even if they have not been instantiated. In the absence of .ali files
1042 -- for generic units, we must force the load of the body, just to
1043 -- produce the proper error if the body is absent. We skip this
1044 -- verification if the main unit itself is generic.
1046 if Get_Cunit_Unit_Number (N) = Main_Unit
1047 and then Operating_Mode = Generate_Code
1048 and then Expander_Active
1050 -- Check whether the source for the body of the unit must be included
1051 -- in a standalone library.
1053 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit));
1055 -- Indicate that the main unit is now analyzed, to catch possible
1056 -- circularities between it and generic bodies. Remove main unit from
1057 -- visibility. This might seem superfluous, but the main unit must
1058 -- not be visible in the generic body expansions that follow.
1060 Set_Analyzed (N, True);
1061 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False);
1066 Un : Unit_Number_Type;
1068 Save_Style_Check : constant Boolean := Style_Check;
1071 Item := First (Context_Items (N));
1072 while Present (Item) loop
1074 -- Check for explicit with clause
1076 if Nkind (Item) = N_With_Clause
1077 and then not Implicit_With (Item)
1079 -- Ada 2005 (AI-50217): Ignore limited-withed units
1081 and then not Limited_Present (Item)
1083 Nam := Entity (Name (Item));
1085 -- Compile generic subprogram, unless it is intrinsic or
1086 -- imported so no body is required, or generic package body
1087 -- if the package spec requires a body.
1089 if (Is_Generic_Subprogram (Nam)
1090 and then not Is_Intrinsic_Subprogram (Nam)
1091 and then not Is_Imported (Nam))
1092 or else (Ekind (Nam) = E_Generic_Package
1093 and then Unit_Requires_Body (Nam))
1095 Style_Check := False;
1097 if Present (Renamed_Object (Nam)) then
1100 (Load_Name => Get_Body_Name
1102 (Unit_Declaration_Node
1103 (Renamed_Object (Nam)))),
1111 (Load_Name => Get_Body_Name
1112 (Get_Unit_Name (Item)),
1119 if Un = No_Unit then
1121 ("body of generic unit& not found", Item, Nam);
1124 elsif not Analyzed (Cunit (Un))
1125 and then Un /= Main_Unit
1126 and then not Fatal_Error (Un)
1128 Style_Check := False;
1129 Semantics (Cunit (Un));
1137 -- Restore style checks settings
1139 Style_Check := Save_Style_Check;
1143 -- Deal with creating elaboration Boolean if needed. We create an
1144 -- elaboration boolean only for units that come from source since
1145 -- units manufactured by the compiler never need elab checks.
1147 if Comes_From_Source (N)
1148 and then Nkind_In (Unit_Node, N_Package_Declaration,
1149 N_Generic_Package_Declaration,
1150 N_Subprogram_Declaration,
1151 N_Generic_Subprogram_Declaration)
1154 Loc : constant Source_Ptr := Sloc (N);
1155 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc);
1158 Spec_Id := Defining_Entity (Unit_Node);
1159 Generate_Definition (Spec_Id);
1161 -- See if an elaboration entity is required for possible access
1162 -- before elaboration checking. Note that we must allow for this
1163 -- even if -gnatE is not set, since a client may be compiled in
1164 -- -gnatE mode and reference the entity.
1166 -- These entities are also used by the binder to prevent multiple
1167 -- attempts to execute the elaboration code for the library case
1168 -- where the elaboration routine might otherwise be called more
1171 -- Case of units which do not require elaboration checks
1174 -- Pure units do not need checks
1178 -- Preelaborated units do not need checks
1180 or else Is_Preelaborated (Spec_Id)
1182 -- No checks needed if pragma Elaborate_Body present
1184 or else Has_Pragma_Elaborate_Body (Spec_Id)
1186 -- No checks needed if unit does not require a body
1188 or else not Unit_Requires_Body (Spec_Id)
1190 -- No checks needed for predefined files
1192 or else Is_Predefined_File_Name (Unit_File_Name (Unum))
1194 -- No checks required if no separate spec
1196 or else Acts_As_Spec (N)
1198 -- This is a case where we only need the entity for
1199 -- checking to prevent multiple elaboration checks.
1201 Set_Elaboration_Entity_Required (Spec_Id, False);
1203 -- Case of elaboration entity is required for access before
1204 -- elaboration checking (so certainly we must build it!)
1207 Set_Elaboration_Entity_Required (Spec_Id, True);
1210 Build_Elaboration_Entity (N, Spec_Id);
1214 -- Freeze the compilation unit entity. This for sure is needed because
1215 -- of some warnings that can be output (see Freeze_Subprogram), but may
1216 -- in general be required. If freezing actions result, place them in the
1217 -- compilation unit actions list, and analyze them.
1220 L : constant List_Id :=
1221 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), N);
1223 while Is_Non_Empty_List (L) loop
1224 Insert_Library_Level_Action (Remove_Head (L));
1230 if Nkind (Unit_Node) = N_Package_Declaration
1231 and then Get_Cunit_Unit_Number (N) /= Main_Unit
1232 and then Expander_Active
1235 Save_Style_Check : constant Boolean := Style_Check;
1236 Save_Warning : constant Warning_Mode_Type := Warning_Mode;
1237 Options : Style_Check_Options;
1240 Save_Style_Check_Options (Options);
1241 Reset_Style_Check_Options;
1242 Opt.Warning_Mode := Suppress;
1243 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node));
1245 Reset_Style_Check_Options;
1246 Set_Style_Check_Options (Options);
1247 Style_Check := Save_Style_Check;
1248 Warning_Mode := Save_Warning;
1252 -- If we are generating obsolescent warnings, then here is where we
1253 -- generate them for the with'ed items. The reason for this special
1254 -- processing is that the normal mechanism of generating the warnings
1255 -- for referenced entities does not work for context clause references.
1256 -- That's because when we first analyze the context, it is too early to
1257 -- know if the with'ing unit is itself obsolescent (which suppresses
1260 if not GNAT_Mode and then Warn_On_Obsolescent_Feature then
1262 -- Push current compilation unit as scope, so that the test for
1263 -- being within an obsolescent unit will work correctly.
1265 Push_Scope (Defining_Entity (Unit_Node));
1267 -- Loop through context items to deal with with clauses
1275 Item := First (Context_Items (N));
1276 while Present (Item) loop
1277 if Nkind (Item) = N_With_Clause
1279 -- Suppress this check in limited-withed units. Further work
1280 -- needed here if we decide to incorporate this check on
1281 -- limited-withed units.
1283 and then not Limited_Present (Item)
1286 Ent := Entity (Nam);
1288 if Is_Obsolescent (Ent) then
1289 Output_Obsolescent_Entity_Warnings (Nam, Ent);
1297 -- Remove temporary install of current unit as scope
1301 end Analyze_Compilation_Unit;
1303 ---------------------
1304 -- Analyze_Context --
1305 ---------------------
1307 procedure Analyze_Context (N : Node_Id) is
1308 Ukind : constant Node_Kind := Nkind (Unit (N));
1312 -- First process all configuration pragmas at the start of the context
1313 -- items. Strictly these are not part of the context clause, but that
1314 -- is where the parser puts them. In any case for sure we must analyze
1315 -- these before analyzing the actual context items, since they can have
1316 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1317 -- be with'ed as a result of changing categorizations in Ada 2005).
1319 Item := First (Context_Items (N));
1320 while Present (Item)
1321 and then Nkind (Item) = N_Pragma
1322 and then Pragma_Name (Item) in Configuration_Pragma_Names
1328 -- This is the point at which we capture the configuration settings
1329 -- for the unit. At the moment only the Optimize_Alignment setting
1330 -- needs to be captured. Probably more later ???
1332 if Optimize_Alignment_Local then
1333 Set_OA_Setting (Current_Sem_Unit, 'L');
1335 Set_OA_Setting (Current_Sem_Unit, Optimize_Alignment);
1338 -- Loop through actual context items. This is done in two passes:
1340 -- a) The first pass analyzes non-limited with-clauses and also any
1341 -- configuration pragmas (we need to get the latter analyzed right
1342 -- away, since they can affect processing of subsequent items.
1344 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1346 while Present (Item) loop
1348 -- For with clause, analyze the with clause, and then update the
1349 -- version, since we are dependent on a unit that we with.
1351 if Nkind (Item) = N_With_Clause
1352 and then not Limited_Present (Item)
1354 -- Skip analyzing with clause if no unit, nothing to do (this
1355 -- happens for a with that references a non-existent unit). Skip
1356 -- as well if this is a with_clause for the main unit, which
1357 -- happens if a subunit has a useless with_clause on its parent.
1359 if Present (Library_Unit (Item)) then
1360 if Library_Unit (Item) /= Cunit (Current_Sem_Unit) then
1364 Set_Entity (Name (Item), Cunit_Entity (Current_Sem_Unit));
1368 if not Implicit_With (Item) then
1369 Version_Update (N, Library_Unit (Item));
1372 -- Skip pragmas. Configuration pragmas at the start were handled in
1373 -- the loop above, and remaining pragmas are not processed until we
1374 -- actually install the context (see Install_Context). We delay the
1375 -- analysis of these pragmas to make sure that we have installed all
1376 -- the implicit with's on parent units.
1378 -- Skip use clauses at this stage, since we don't want to do any
1379 -- installing of potentially use-visible entities until we
1380 -- actually install the complete context (in Install_Context).
1381 -- Otherwise things can get installed in the wrong context.
1390 -- Second pass: examine all limited_with clauses. All other context
1391 -- items are ignored in this pass.
1393 Item := First (Context_Items (N));
1394 while Present (Item) loop
1395 if Nkind (Item) = N_With_Clause
1396 and then Limited_Present (Item)
1398 -- No need to check errors on implicitly generated limited-with
1401 if not Implicit_With (Item) then
1403 -- Verify that the illegal contexts given in 10.1.2 (18/2) are
1404 -- properly rejected, including renaming declarations.
1406 if not Nkind_In (Ukind, N_Package_Declaration,
1407 N_Subprogram_Declaration)
1408 and then Ukind not in N_Generic_Declaration
1409 and then Ukind not in N_Generic_Instantiation
1411 Error_Msg_N ("limited with_clause not allowed here", Item);
1413 -- Check wrong use of a limited with clause applied to the
1414 -- compilation unit containing the limited-with clause.
1416 -- limited with P.Q;
1417 -- package P.Q is ...
1419 elsif Unit (Library_Unit (Item)) = Unit (N) then
1420 Error_Msg_N ("wrong use of limited-with clause", Item);
1422 -- Check wrong use of limited-with clause applied to some
1423 -- immediate ancestor.
1425 elsif Is_Child_Spec (Unit (N)) then
1427 Lib_U : constant Entity_Id := Unit (Library_Unit (Item));
1431 P := Parent_Spec (Unit (N));
1433 if Unit (P) = Lib_U then
1434 Error_Msg_N ("limited with_clause cannot "
1435 & "name ancestor", Item);
1439 exit when not Is_Child_Spec (Unit (P));
1440 P := Parent_Spec (Unit (P));
1445 -- Check if the limited-withed unit is already visible through
1446 -- some context clause of the current compilation unit or some
1447 -- ancestor of the current compilation unit.
1450 Lim_Unit_Name : constant Node_Id := Name (Item);
1451 Comp_Unit : Node_Id;
1453 Unit_Name : Node_Id;
1458 It := First (Context_Items (Comp_Unit));
1459 while Present (It) loop
1461 and then Nkind (It) = N_With_Clause
1462 and then not Limited_Present (It)
1464 Nkind_In (Unit (Library_Unit (It)),
1465 N_Package_Declaration,
1466 N_Package_Renaming_Declaration)
1468 if Nkind (Unit (Library_Unit (It))) =
1469 N_Package_Declaration
1471 Unit_Name := Name (It);
1473 Unit_Name := Name (Unit (Library_Unit (It)));
1476 -- Check if the named package (or some ancestor)
1477 -- leaves visible the full-view of the unit given
1478 -- in the limited-with clause
1481 if Designate_Same_Unit (Lim_Unit_Name,
1484 Error_Msg_Sloc := Sloc (It);
1486 ("simultaneous visibility of limited "
1487 & "and unlimited views not allowed",
1490 ("\unlimited view visible through "
1491 & "context clause #",
1495 elsif Nkind (Unit_Name) = N_Identifier then
1499 Unit_Name := Prefix (Unit_Name);
1506 exit when not Is_Child_Spec (Unit (Comp_Unit));
1508 Comp_Unit := Parent_Spec (Unit (Comp_Unit));
1513 -- Skip analyzing with clause if no unit, see above
1515 if Present (Library_Unit (Item)) then
1519 -- A limited_with does not impose an elaboration order, but
1520 -- there is a semantic dependency for recompilation purposes.
1522 if not Implicit_With (Item) then
1523 Version_Update (N, Library_Unit (Item));
1526 -- Pragmas and use clauses and with clauses other than limited
1527 -- with's are ignored in this pass through the context items.
1535 end Analyze_Context;
1537 -------------------------------
1538 -- Analyze_Package_Body_Stub --
1539 -------------------------------
1541 procedure Analyze_Package_Body_Stub (N : Node_Id) is
1542 Id : constant Entity_Id := Defining_Identifier (N);
1546 -- The package declaration must be in the current declarative part
1548 Check_Stub_Level (N);
1549 Nam := Current_Entity_In_Scope (Id);
1551 if No (Nam) or else not Is_Package_Or_Generic_Package (Nam) then
1552 Error_Msg_N ("missing specification for package stub", N);
1554 elsif Has_Completion (Nam)
1555 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam)))
1557 Error_Msg_N ("duplicate or redundant stub for package", N);
1560 -- Indicate that the body of the package exists. If we are doing
1561 -- only semantic analysis, the stub stands for the body. If we are
1562 -- generating code, the existence of the body will be confirmed
1563 -- when we load the proper body.
1565 Set_Has_Completion (Nam);
1566 Set_Scope (Defining_Entity (N), Current_Scope);
1567 Generate_Reference (Nam, Id, 'b');
1568 Analyze_Proper_Body (N, Nam);
1570 end Analyze_Package_Body_Stub;
1572 -------------------------
1573 -- Analyze_Proper_Body --
1574 -------------------------
1576 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is
1577 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
1578 Unum : Unit_Number_Type;
1580 procedure Optional_Subunit;
1581 -- This procedure is called when the main unit is a stub, or when we
1582 -- are not generating code. In such a case, we analyze the subunit if
1583 -- present, which is user-friendly and in fact required for ASIS, but
1584 -- we don't complain if the subunit is missing.
1586 ----------------------
1587 -- Optional_Subunit --
1588 ----------------------
1590 procedure Optional_Subunit is
1591 Comp_Unit : Node_Id;
1594 -- Try to load subunit, but ignore any errors that occur during the
1595 -- loading of the subunit, by using the special feature in Errout to
1596 -- ignore all errors. Note that Fatal_Error will still be set, so we
1597 -- will be able to check for this case below.
1599 if not ASIS_Mode then
1600 Ignore_Errors_Enable := Ignore_Errors_Enable + 1;
1605 (Load_Name => Subunit_Name,
1610 if not ASIS_Mode then
1611 Ignore_Errors_Enable := Ignore_Errors_Enable - 1;
1614 -- All done if we successfully loaded the subunit
1617 and then (not Fatal_Error (Unum) or else Try_Semantics)
1619 Comp_Unit := Cunit (Unum);
1621 -- If the file was empty or seriously mangled, the unit itself may
1624 if No (Unit (Comp_Unit)) then
1626 ("subunit does not contain expected proper body", N);
1628 elsif Nkind (Unit (Comp_Unit)) /= N_Subunit then
1630 ("expected SEPARATE subunit, found child unit",
1631 Cunit_Entity (Unum));
1633 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1634 Analyze_Subunit (Comp_Unit);
1635 Set_Library_Unit (N, Comp_Unit);
1638 elsif Unum = No_Unit
1639 and then Present (Nam)
1641 if Is_Protected_Type (Nam) then
1642 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N));
1644 Set_Corresponding_Body (
1645 Unit_Declaration_Node (Nam), Defining_Identifier (N));
1648 end Optional_Subunit;
1650 -- Start of processing for Analyze_Proper_Body
1653 -- If the subunit is already loaded, it means that the main unit is a
1654 -- subunit, and that the current unit is one of its parents which was
1655 -- being analyzed to provide the needed context for the analysis of the
1656 -- subunit. In this case we analyze the subunit and continue with the
1657 -- parent, without looking at subsequent subunits.
1659 if Is_Loaded (Subunit_Name) then
1661 -- If the proper body is already linked to the stub node, the stub is
1662 -- in a generic unit and just needs analyzing.
1664 if Present (Library_Unit (N)) then
1665 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1667 -- If the subunit has severe errors, the spec of the enclosing
1668 -- body may not be available, in which case do not try analysis.
1670 if Serious_Errors_Detected > 0
1671 and then No (Library_Unit (Library_Unit (N)))
1676 Analyze_Subunit (Library_Unit (N));
1678 -- Otherwise we must load the subunit and link to it
1681 -- Load the subunit, this must work, since we originally loaded
1682 -- the subunit earlier on. So this will not really load it, just
1683 -- give access to it.
1687 (Load_Name => Subunit_Name,
1692 -- And analyze the subunit in the parent context (note that we
1693 -- do not call Semantics, since that would remove the parent
1694 -- context). Because of this, we have to manually reset the
1695 -- compiler state to Analyzing since it got destroyed by Load.
1697 if Unum /= No_Unit then
1698 Compiler_State := Analyzing;
1700 -- Check that the proper body is a subunit and not a child
1701 -- unit. If the unit was previously loaded, the error will
1702 -- have been emitted when copying the generic node, so we
1703 -- just return to avoid cascaded errors.
1705 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then
1709 Set_Corresponding_Stub (Unit (Cunit (Unum)), N);
1710 Analyze_Subunit (Cunit (Unum));
1711 Set_Library_Unit (N, Cunit (Unum));
1715 -- If the main unit is a subunit, then we are just performing semantic
1716 -- analysis on that subunit, and any other subunits of any parent unit
1717 -- should be ignored, except that if we are building trees for ASIS
1718 -- usage we want to annotate the stub properly.
1720 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
1721 and then Subunit_Name /= Unit_Name (Main_Unit)
1727 -- But before we return, set the flag for unloaded subunits. This
1728 -- will suppress junk warnings of variables in the same declarative
1729 -- part (or a higher level one) that are in danger of looking unused
1730 -- when in fact there might be a declaration in the subunit that we
1731 -- do not intend to load.
1733 Unloaded_Subunits := True;
1736 -- If the subunit is not already loaded, and we are generating code,
1737 -- then this is the case where compilation started from the parent, and
1738 -- we are generating code for an entire subunit tree. In that case we
1739 -- definitely need to load the subunit.
1741 -- In order to continue the analysis with the rest of the parent,
1742 -- and other subunits, we load the unit without requiring its
1743 -- presence, and emit a warning if not found, rather than terminating
1744 -- the compilation abruptly, as for other missing file problems.
1746 elsif Original_Operating_Mode = Generate_Code then
1748 -- If the proper body is already linked to the stub node, the stub is
1749 -- in a generic unit and just needs analyzing.
1751 -- We update the version. Although we are not strictly technically
1752 -- semantically dependent on the subunit, given our approach of macro
1753 -- substitution of subunits, it makes sense to include it in the
1754 -- version identification.
1756 if Present (Library_Unit (N)) then
1757 Set_Corresponding_Stub (Unit (Library_Unit (N)), N);
1758 Analyze_Subunit (Library_Unit (N));
1759 Version_Update (Cunit (Main_Unit), Library_Unit (N));
1761 -- Otherwise we must load the subunit and link to it
1764 -- Make sure that, if the subunit is preprocessed and -gnateG is
1765 -- specified, the preprocessed file will be written.
1767 Lib.Analysing_Subunit_Of_Main := True;
1770 (Load_Name => Subunit_Name,
1774 Lib.Analysing_Subunit_Of_Main := False;
1776 -- Give message if we did not get the unit Emit warning even if
1777 -- missing subunit is not within main unit, to simplify debugging.
1779 if Original_Operating_Mode = Generate_Code
1780 and then Unum = No_Unit
1782 Error_Msg_Unit_1 := Subunit_Name;
1784 Get_File_Name (Subunit_Name, Subunit => True);
1786 ("subunit$$ in file{ not found?!!", N);
1787 Subunits_Missing := True;
1790 -- Load_Unit may reset Compiler_State, since it may have been
1791 -- necessary to parse an additional units, so we make sure that
1792 -- we reset it to the Analyzing state.
1794 Compiler_State := Analyzing;
1796 if Unum /= No_Unit then
1797 if Debug_Flag_L then
1798 Write_Str ("*** Loaded subunit from stub. Analyze");
1803 Comp_Unit : constant Node_Id := Cunit (Unum);
1806 -- Check for child unit instead of subunit
1808 if Nkind (Unit (Comp_Unit)) /= N_Subunit then
1810 ("expected SEPARATE subunit, found child unit",
1811 Cunit_Entity (Unum));
1813 -- OK, we have a subunit
1816 -- Set corresponding stub (even if errors)
1818 Set_Corresponding_Stub (Unit (Comp_Unit), N);
1820 -- Collect SCO information for loaded subunit if we are
1821 -- in the main unit).
1825 In_Extended_Main_Source_Unit
1826 (Cunit_Entity (Current_Sem_Unit))
1831 -- Analyze the unit if semantics active
1833 if not Fatal_Error (Unum) or else Try_Semantics then
1834 Analyze_Subunit (Comp_Unit);
1837 -- Set the library unit pointer in any case
1839 Set_Library_Unit (N, Comp_Unit);
1841 -- We update the version. Although we are not technically
1842 -- semantically dependent on the subunit, given our
1843 -- approach of macro substitution of subunits, it makes
1844 -- sense to include it in the version identification.
1846 Version_Update (Cunit (Main_Unit), Comp_Unit);
1852 -- The remaining case is when the subunit is not already loaded and we
1853 -- are not generating code. In this case we are just performing semantic
1854 -- analysis on the parent, and we are not interested in the subunit. For
1855 -- subprograms, analyze the stub as a body. For other entities the stub
1856 -- has already been marked as completed.
1861 end Analyze_Proper_Body;
1863 ----------------------------------
1864 -- Analyze_Protected_Body_Stub --
1865 ----------------------------------
1867 procedure Analyze_Protected_Body_Stub (N : Node_Id) is
1868 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
1871 Check_Stub_Level (N);
1873 -- First occurrence of name may have been as an incomplete type
1875 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
1876 Nam := Full_View (Nam);
1880 or else not Is_Protected_Type (Etype (Nam))
1882 Error_Msg_N ("missing specification for Protected body", N);
1884 Set_Scope (Defining_Entity (N), Current_Scope);
1885 Set_Has_Completion (Etype (Nam));
1886 Generate_Reference (Nam, Defining_Identifier (N), 'b');
1887 Analyze_Proper_Body (N, Etype (Nam));
1889 end Analyze_Protected_Body_Stub;
1891 ----------------------------------
1892 -- Analyze_Subprogram_Body_Stub --
1893 ----------------------------------
1895 -- A subprogram body stub can appear with or without a previous spec. If
1896 -- there is one, then the analysis of the body will find it and verify
1897 -- conformance. The formals appearing in the specification of the stub play
1898 -- no role, except for requiring an additional conformance check. If there
1899 -- is no previous subprogram declaration, the stub acts as a spec, and
1900 -- provides the defining entity for the subprogram.
1902 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is
1906 Check_Stub_Level (N);
1908 -- Verify that the identifier for the stub is unique within this
1909 -- declarative part.
1911 if Nkind_In (Parent (N), N_Block_Statement,
1915 Decl := First (Declarations (Parent (N)));
1916 while Present (Decl)
1919 if Nkind (Decl) = N_Subprogram_Body_Stub
1920 and then (Chars (Defining_Unit_Name (Specification (Decl))) =
1921 Chars (Defining_Unit_Name (Specification (N))))
1923 Error_Msg_N ("identifier for stub is not unique", N);
1930 -- Treat stub as a body, which checks conformance if there is a previous
1931 -- declaration, or else introduces entity and its signature.
1933 Analyze_Subprogram_Body (N);
1934 Analyze_Proper_Body (N, Empty);
1935 end Analyze_Subprogram_Body_Stub;
1937 ---------------------
1938 -- Analyze_Subunit --
1939 ---------------------
1941 -- A subunit is compiled either by itself (for semantic checking) or as
1942 -- part of compiling the parent (for code generation). In either case, by
1943 -- the time we actually process the subunit, the parent has already been
1944 -- installed and analyzed. The node N is a compilation unit, whose context
1945 -- needs to be treated here, because we come directly here from the parent
1946 -- without calling Analyze_Compilation_Unit.
1948 -- The compilation context includes the explicit context of the subunit,
1949 -- and the context of the parent, together with the parent itself. In order
1950 -- to compile the current context, we remove the one inherited from the
1951 -- parent, in order to have a clean visibility table. We restore the parent
1952 -- context before analyzing the proper body itself. On exit, we remove only
1953 -- the explicit context of the subunit.
1955 procedure Analyze_Subunit (N : Node_Id) is
1956 Lib_Unit : constant Node_Id := Library_Unit (N);
1957 Par_Unit : constant Entity_Id := Current_Scope;
1959 Lib_Spec : Node_Id := Library_Unit (Lib_Unit);
1960 Num_Scopes : Int := 0;
1961 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
1962 Enclosing_Child : Entity_Id := Empty;
1963 Svg : constant Suppress_Array := Scope_Suppress;
1965 Save_Cunit_Restrictions : constant Save_Cunit_Boolean_Restrictions :=
1966 Cunit_Boolean_Restrictions_Save;
1967 -- Save non-partition wide restrictions before processing the subunit.
1968 -- All subunits are analyzed with config restrictions reset and we need
1969 -- to restore these saved values at the end.
1971 procedure Analyze_Subunit_Context;
1972 -- Capture names in use clauses of the subunit. This must be done before
1973 -- re-installing parent declarations, because items in the context must
1974 -- not be hidden by declarations local to the parent.
1976 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id);
1977 -- Recursive procedure to restore scope of all ancestors of subunit,
1978 -- from outermost in. If parent is not a subunit, the call to install
1979 -- context installs context of spec and (if parent is a child unit) the
1980 -- context of its parents as well. It is confusing that parents should
1981 -- be treated differently in both cases, but the semantics are just not
1984 procedure Re_Install_Use_Clauses;
1985 -- As part of the removal of the parent scope, the use clauses are
1986 -- removed, to be reinstalled when the context of the subunit has been
1987 -- analyzed. Use clauses may also have been affected by the analysis of
1988 -- the context of the subunit, so they have to be applied again, to
1989 -- insure that the compilation environment of the rest of the parent
1990 -- unit is identical.
1992 procedure Remove_Scope;
1993 -- Remove current scope from scope stack, and preserve the list of use
1994 -- clauses in it, to be reinstalled after context is analyzed.
1996 -----------------------------
1997 -- Analyze_Subunit_Context --
1998 -----------------------------
2000 procedure Analyze_Subunit_Context is
2003 Unit_Name : Entity_Id;
2006 Analyze_Context (N);
2008 -- Make withed units immediately visible. If child unit, make the
2009 -- ultimate parent immediately visible.
2011 Item := First (Context_Items (N));
2012 while Present (Item) loop
2013 if Nkind (Item) = N_With_Clause then
2015 -- Protect frontend against previous errors in context clauses
2017 if Nkind (Name (Item)) /= N_Selected_Component then
2018 if Error_Posted (Item) then
2022 -- If a subunits has serious syntax errors, the context
2023 -- may not have been loaded. Add a harmless unit name to
2024 -- attempt processing.
2026 if Serious_Errors_Detected > 0
2027 and then No (Entity (Name (Item)))
2029 Set_Entity (Name (Item), Standard_Standard);
2032 Unit_Name := Entity (Name (Item));
2033 while Is_Child_Unit (Unit_Name) loop
2034 Set_Is_Visible_Child_Unit (Unit_Name);
2035 Unit_Name := Scope (Unit_Name);
2038 if not Is_Immediately_Visible (Unit_Name) then
2039 Set_Is_Immediately_Visible (Unit_Name);
2040 Set_Context_Installed (Item);
2045 elsif Nkind (Item) = N_Use_Package_Clause then
2046 Nam := First (Names (Item));
2047 while Present (Nam) loop
2052 elsif Nkind (Item) = N_Use_Type_Clause then
2053 Nam := First (Subtype_Marks (Item));
2054 while Present (Nam) loop
2063 -- Reset visibility of withed units. They will be made visible again
2064 -- when we install the subunit context.
2066 Item := First (Context_Items (N));
2067 while Present (Item) loop
2068 if Nkind (Item) = N_With_Clause
2070 -- Protect frontend against previous errors in context clauses
2072 and then Nkind (Name (Item)) /= N_Selected_Component
2073 and then not Error_Posted (Item)
2075 Unit_Name := Entity (Name (Item));
2076 while Is_Child_Unit (Unit_Name) loop
2077 Set_Is_Visible_Child_Unit (Unit_Name, False);
2078 Unit_Name := Scope (Unit_Name);
2081 if Context_Installed (Item) then
2082 Set_Is_Immediately_Visible (Unit_Name, False);
2083 Set_Context_Installed (Item, False);
2089 end Analyze_Subunit_Context;
2091 ------------------------
2092 -- Re_Install_Parents --
2093 ------------------------
2095 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is
2099 if Nkind (Unit (L)) = N_Subunit then
2100 Re_Install_Parents (Library_Unit (L), Scope (Scop));
2103 Install_Context (L);
2105 -- If the subunit occurs within a child unit, we must restore the
2106 -- immediate visibility of any siblings that may occur in context.
2108 if Present (Enclosing_Child) then
2109 Install_Siblings (Enclosing_Child, L);
2114 if Scop /= Par_Unit then
2115 Set_Is_Immediately_Visible (Scop);
2118 -- Make entities in scope visible again. For child units, restore
2119 -- visibility only if they are actually in context.
2121 E := First_Entity (Current_Scope);
2122 while Present (E) loop
2123 if not Is_Child_Unit (E)
2124 or else Is_Visible_Child_Unit (E)
2126 Set_Is_Immediately_Visible (E);
2132 -- A subunit appears within a body, and for a nested subunits all the
2133 -- parents are bodies. Restore full visibility of their private
2136 if Is_Package_Or_Generic_Package (Scop) then
2137 Set_In_Package_Body (Scop);
2138 Install_Private_Declarations (Scop);
2140 end Re_Install_Parents;
2142 ----------------------------
2143 -- Re_Install_Use_Clauses --
2144 ----------------------------
2146 procedure Re_Install_Use_Clauses is
2149 for J in reverse 1 .. Num_Scopes loop
2150 U := Use_Clauses (J);
2151 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U;
2152 Install_Use_Clauses (U, Force_Installation => True);
2154 end Re_Install_Use_Clauses;
2160 procedure Remove_Scope is
2164 Num_Scopes := Num_Scopes + 1;
2165 Use_Clauses (Num_Scopes) :=
2166 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause;
2168 E := First_Entity (Current_Scope);
2169 while Present (E) loop
2170 Set_Is_Immediately_Visible (E, False);
2174 if Is_Child_Unit (Current_Scope) then
2175 Enclosing_Child := Current_Scope;
2181 -- Start of processing for Analyze_Subunit
2184 -- For subunit in main extended unit, we reset the configuration values
2185 -- for the non-partition-wide restrictions. For other units reset them.
2187 if In_Extended_Main_Source_Unit (N) then
2188 Restore_Config_Cunit_Boolean_Restrictions;
2190 Reset_Cunit_Boolean_Restrictions;
2195 Nam : Node_Id := Name (Unit (N));
2198 if Nkind (Nam) = N_Selected_Component then
2199 Nam := Selector_Name (Nam);
2202 Check_Identifier (Nam, Par_Unit);
2206 if not Is_Empty_List (Context_Items (N)) then
2208 -- Save current use clauses
2211 Remove_Context (Lib_Unit);
2213 -- Now remove parents and their context, including enclosing subunits
2214 -- and the outer parent body which is not a subunit.
2216 if Present (Lib_Spec) then
2217 Remove_Context (Lib_Spec);
2219 while Nkind (Unit (Lib_Spec)) = N_Subunit loop
2220 Lib_Spec := Library_Unit (Lib_Spec);
2222 Remove_Context (Lib_Spec);
2225 if Nkind (Unit (Lib_Unit)) = N_Subunit then
2229 if Nkind (Unit (Lib_Spec)) = N_Package_Body then
2230 Remove_Context (Library_Unit (Lib_Spec));
2234 Set_Is_Immediately_Visible (Par_Unit, False);
2236 Analyze_Subunit_Context;
2238 Re_Install_Parents (Lib_Unit, Par_Unit);
2239 Set_Is_Immediately_Visible (Par_Unit);
2241 -- If the context includes a child unit of the parent of the subunit,
2242 -- the parent will have been removed from visibility, after compiling
2243 -- that cousin in the context. The visibility of the parent must be
2244 -- restored now. This also applies if the context includes another
2245 -- subunit of the same parent which in turn includes a child unit in
2248 if Is_Package_Or_Generic_Package (Par_Unit) then
2249 if not Is_Immediately_Visible (Par_Unit)
2250 or else (Present (First_Entity (Par_Unit))
2251 and then not Is_Immediately_Visible
2252 (First_Entity (Par_Unit)))
2254 Set_Is_Immediately_Visible (Par_Unit);
2255 Install_Visible_Declarations (Par_Unit);
2256 Install_Private_Declarations (Par_Unit);
2260 Re_Install_Use_Clauses;
2261 Install_Context (N);
2263 -- Restore state of suppress flags for current body
2265 Scope_Suppress := Svg;
2267 -- If the subunit is within a child unit, then siblings of any parent
2268 -- unit that appear in the context clause of the subunit must also be
2269 -- made immediately visible.
2271 if Present (Enclosing_Child) then
2272 Install_Siblings (Enclosing_Child, N);
2276 Analyze (Proper_Body (Unit (N)));
2279 -- The subunit may contain a with_clause on a sibling of some ancestor.
2280 -- Removing the context will remove from visibility those ancestor child
2281 -- units, which must be restored to the visibility they have in the
2284 if Present (Enclosing_Child) then
2290 and then Is_Child_Unit (C)
2292 Set_Is_Immediately_Visible (C);
2293 Set_Is_Visible_Child_Unit (C);
2299 -- Deal with restore of restrictions
2301 Cunit_Boolean_Restrictions_Restore (Save_Cunit_Restrictions);
2302 end Analyze_Subunit;
2304 ----------------------------
2305 -- Analyze_Task_Body_Stub --
2306 ----------------------------
2308 procedure Analyze_Task_Body_Stub (N : Node_Id) is
2309 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N));
2310 Loc : constant Source_Ptr := Sloc (N);
2313 Check_Stub_Level (N);
2315 -- First occurrence of name may have been as an incomplete type
2317 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then
2318 Nam := Full_View (Nam);
2321 if No (Nam) or else not Is_Task_Type (Etype (Nam)) then
2322 Error_Msg_N ("missing specification for task body", N);
2324 Set_Scope (Defining_Entity (N), Current_Scope);
2325 Generate_Reference (Nam, Defining_Identifier (N), 'b');
2327 -- Check for duplicate stub, if so give message and terminate
2329 if Has_Completion (Etype (Nam)) then
2330 Error_Msg_N ("duplicate stub for task", N);
2333 Set_Has_Completion (Etype (Nam));
2336 Analyze_Proper_Body (N, Etype (Nam));
2338 -- Set elaboration flag to indicate that entity is callable. This
2339 -- cannot be done in the expansion of the body itself, because the
2340 -- proper body is not in a declarative part. This is only done if
2341 -- expansion is active, because the context may be generic and the
2342 -- flag not defined yet.
2344 if Full_Expander_Active then
2346 Make_Assignment_Statement (Loc,
2348 Make_Identifier (Loc,
2349 Chars => New_External_Name (Chars (Etype (Nam)), 'E')),
2350 Expression => New_Reference_To (Standard_True, Loc)));
2353 end Analyze_Task_Body_Stub;
2355 -------------------------
2356 -- Analyze_With_Clause --
2357 -------------------------
2359 -- Analyze the declaration of a unit in a with clause. At end, label the
2360 -- with clause with the defining entity for the unit.
2362 procedure Analyze_With_Clause (N : Node_Id) is
2364 -- Retrieve the original kind of the unit node, before analysis. If it
2365 -- is a subprogram instantiation, its analysis below will rewrite the
2366 -- node as the declaration of the wrapper package. If the same
2367 -- instantiation appears indirectly elsewhere in the context, it will
2368 -- have been analyzed already.
2370 Unit_Kind : constant Node_Kind :=
2371 Nkind (Original_Node (Unit (Library_Unit (N))));
2372 Nam : constant Node_Id := Name (N);
2374 Par_Name : Entity_Id;
2379 -- Set True if the unit currently being compiled is an internal unit
2381 Restriction_Violation : Boolean := False;
2382 -- Set True if a with violates a restriction, no point in giving any
2383 -- warnings if we have this definite error.
2385 Save_Style_Check : constant Boolean := Opt.Style_Check;
2388 U := Unit (Library_Unit (N));
2390 -- If this is an internal unit which is a renaming, then this is a
2391 -- violation of No_Obsolescent_Features.
2393 -- Note: this is not quite right if the user defines one of these units
2394 -- himself, but that's a marginal case, and fixing it is hard ???
2396 if Restriction_Check_Required (No_Obsolescent_Features) then
2398 F : constant File_Name_Type :=
2399 Unit_File_Name (Get_Source_Unit (U));
2401 if Is_Predefined_File_Name (F, Renamings_Included => True)
2403 Is_Predefined_File_Name (F, Renamings_Included => False)
2405 Check_Restriction (No_Obsolescent_Features, N);
2406 Restriction_Violation := True;
2411 -- Check No_Implementation_Units violation
2413 if Restriction_Check_Required (No_Implementation_Units) then
2414 if Not_Impl_Defined_Unit (Get_Source_Unit (U)) then
2417 Check_Restriction (No_Implementation_Units, Nam);
2418 Restriction_Violation := True;
2422 -- Several actions are skipped for dummy packages (those supplied for
2423 -- with's where no matching file could be found). Such packages are
2424 -- identified by the Sloc value being set to No_Location.
2426 if Limited_Present (N) then
2428 -- Ada 2005 (AI-50217): Build visibility structures but do not
2429 -- analyze the unit.
2431 if Sloc (U) /= No_Location then
2432 Build_Limited_Views (N);
2438 -- We reset ordinary style checking during the analysis of a with'ed
2439 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2440 -- definitely *does* apply to with'ed units).
2442 if not GNAT_Mode then
2443 Style_Check := False;
2446 -- If the library unit is a predefined unit, and we are in high
2447 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2448 -- for the analysis of the with'ed unit. This mode does not prevent
2449 -- explicit with'ing of run-time units.
2451 if Configurable_Run_Time_Mode
2452 and then Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (U)))
2454 Configurable_Run_Time_Mode := False;
2455 Semantics (Library_Unit (N));
2456 Configurable_Run_Time_Mode := True;
2459 Semantics (Library_Unit (N));
2462 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit));
2464 if Sloc (U) /= No_Location then
2466 -- Check restrictions, except that we skip the check if this is an
2467 -- internal unit unless we are compiling the internal unit as the
2468 -- main unit. We also skip this for dummy packages.
2470 Check_Restriction_No_Dependence (Nam, N);
2472 if not Intunit or else Current_Sem_Unit = Main_Unit then
2473 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N);
2476 -- Deal with special case of GNAT.Current_Exceptions which interacts
2477 -- with the optimization of local raise statements into gotos.
2479 if Nkind (Nam) = N_Selected_Component
2480 and then Nkind (Prefix (Nam)) = N_Identifier
2481 and then Chars (Prefix (Nam)) = Name_Gnat
2482 and then (Chars (Selector_Name (Nam)) = Name_Most_Recent_Exception
2484 Chars (Selector_Name (Nam)) = Name_Exception_Traces)
2486 Check_Restriction (No_Exception_Propagation, N);
2487 Special_Exception_Package_Used := True;
2490 -- Check for inappropriate with of internal implementation unit if we
2491 -- are not compiling an internal unit and also check for withing unit
2492 -- in wrong version of Ada. Do not issue these messages for implicit
2493 -- with's generated by the compiler itself.
2495 if Implementation_Unit_Warnings
2496 and then not Intunit
2497 and then not Implicit_With (N)
2498 and then not Restriction_Violation
2501 U_Kind : constant Kind_Of_Unit :=
2502 Get_Kind_Of_Unit (Get_Source_Unit (U));
2505 if U_Kind = Implementation_Unit then
2506 Error_Msg_F ("& is an internal 'G'N'A'T unit?", Name (N));
2508 -- Add alternative name if available, otherwise issue a
2509 -- general warning message.
2511 if Error_Msg_Strlen /= 0 then
2512 Error_Msg_F ("\use ""~"" instead", Name (N));
2515 ("\use of this unit is non-portable " &
2516 "and version-dependent?", Name (N));
2519 elsif U_Kind = Ada_2005_Unit
2520 and then Ada_Version < Ada_2005
2521 and then Warn_On_Ada_2005_Compatibility
2523 Error_Msg_N ("& is an Ada 2005 unit?", Name (N));
2525 elsif U_Kind = Ada_2012_Unit
2526 and then Ada_Version < Ada_2012
2527 and then Warn_On_Ada_2012_Compatibility
2529 Error_Msg_N ("& is an Ada 2012 unit?", Name (N));
2535 -- Semantic analysis of a generic unit is performed on a copy of
2536 -- the original tree. Retrieve the entity on which semantic info
2537 -- actually appears.
2539 if Unit_Kind in N_Generic_Declaration then
2540 E_Name := Defining_Entity (U);
2542 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2543 -- the case of an instantiation, semantic analysis above will have
2544 -- replaced the unit by its instantiated version. If the instance body
2545 -- has been generated, the instance now denotes the body entity. For
2546 -- visibility purposes we need the entity of its spec.
2548 elsif (Unit_Kind = N_Package_Instantiation
2549 or else Nkind (Original_Node (Unit (Library_Unit (N)))) =
2550 N_Package_Instantiation)
2551 and then Nkind (U) = N_Package_Body
2553 E_Name := Corresponding_Spec (U);
2555 elsif Unit_Kind = N_Package_Instantiation
2556 and then Nkind (U) = N_Package_Instantiation
2557 and then Present (Instance_Spec (U))
2559 -- If the instance has not been rewritten as a package declaration,
2560 -- then it appeared already in a previous with clause. Retrieve
2561 -- the entity from the previous instance.
2563 E_Name := Defining_Entity (Specification (Instance_Spec (U)));
2565 elsif Unit_Kind in N_Subprogram_Instantiation then
2567 -- The visible subprogram is created during instantiation, and is
2568 -- an attribute of the wrapper package. We retrieve the wrapper
2569 -- package directly from the instantiation node. If the instance
2570 -- is inlined the unit is still an instantiation. Otherwise it has
2571 -- been rewritten as the declaration of the wrapper itself.
2573 if Nkind (U) in N_Subprogram_Instantiation then
2576 (Defining_Entity (Specification (Instance_Spec (U))));
2578 E_Name := Related_Instance (Defining_Entity (U));
2581 elsif Unit_Kind = N_Package_Renaming_Declaration
2582 or else Unit_Kind in N_Generic_Renaming_Declaration
2584 E_Name := Defining_Entity (U);
2586 elsif Unit_Kind = N_Subprogram_Body
2587 and then Nkind (Name (N)) = N_Selected_Component
2588 and then not Acts_As_Spec (Library_Unit (N))
2590 -- For a child unit that has no spec, one has been created and
2591 -- analyzed. The entity required is that of the spec.
2593 E_Name := Corresponding_Spec (U);
2596 E_Name := Defining_Entity (U);
2599 if Nkind (Name (N)) = N_Selected_Component then
2601 -- Child unit in a with clause
2603 Change_Selected_Component_To_Expanded_Name (Name (N));
2605 -- If this is a child unit without a spec, and it has been analyzed
2606 -- already, a declaration has been created for it. The with_clause
2607 -- must reflect the actual body, and not the generated declaration,
2608 -- to prevent spurious binding errors involving an out-of-date spec.
2609 -- Note that this can only happen if the unit includes more than one
2610 -- with_clause for the child unit (e.g. in separate subunits).
2612 if Unit_Kind = N_Subprogram_Declaration
2613 and then Analyzed (Library_Unit (N))
2614 and then not Comes_From_Source (Library_Unit (N))
2616 Set_Library_Unit (N,
2617 Cunit (Get_Source_Unit (Corresponding_Body (U))));
2621 -- Restore style checks
2623 Style_Check := Save_Style_Check;
2625 -- Record the reference, but do NOT set the unit as referenced, we want
2626 -- to consider the unit as unreferenced if this is the only reference
2629 Set_Entity_With_Style_Check (Name (N), E_Name);
2630 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False);
2632 -- Generate references and check No_Dependence restriction for parents
2634 if Is_Child_Unit (E_Name) then
2635 Pref := Prefix (Name (N));
2636 Par_Name := Scope (E_Name);
2637 while Nkind (Pref) = N_Selected_Component loop
2638 Change_Selected_Component_To_Expanded_Name (Pref);
2640 if Present (Entity (Selector_Name (Pref)))
2642 Present (Renamed_Entity (Entity (Selector_Name (Pref))))
2643 and then Entity (Selector_Name (Pref)) /= Par_Name
2645 -- The prefix is a child unit that denotes a renaming declaration.
2646 -- Replace the prefix directly with the renamed unit, because the
2647 -- rest of the prefix is irrelevant to the visibility of the real
2650 Rewrite (Pref, New_Occurrence_Of (Par_Name, Sloc (Pref)));
2654 Set_Entity_With_Style_Check (Pref, Par_Name);
2656 Generate_Reference (Par_Name, Pref);
2657 Check_Restriction_No_Dependence (Pref, N);
2658 Pref := Prefix (Pref);
2660 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2661 -- is set to Standard_Standard, and no attempt should be made to
2662 -- further unwind scopes.
2664 if Par_Name /= Standard_Standard then
2665 Par_Name := Scope (Par_Name);
2668 -- Abandon processing in case of previous errors
2670 if No (Par_Name) then
2671 pragma Assert (Serious_Errors_Detected /= 0);
2676 if Present (Entity (Pref))
2677 and then not Analyzed (Parent (Parent (Entity (Pref))))
2679 -- If the entity is set without its unit being compiled, the
2680 -- original parent is a renaming, and Par_Name is the renamed
2681 -- entity. For visibility purposes, we need the original entity,
2682 -- which must be analyzed now because Load_Unit directly retrieves
2683 -- the renamed unit, and the renaming declaration itself has not
2686 Analyze (Parent (Parent (Entity (Pref))));
2687 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name);
2688 Par_Name := Entity (Pref);
2691 -- Guard against missing or misspelled child units
2693 if Present (Par_Name) then
2694 Set_Entity_With_Style_Check (Pref, Par_Name);
2695 Generate_Reference (Par_Name, Pref);
2698 pragma Assert (Serious_Errors_Detected /= 0);
2700 -- Mark the node to indicate that a related error has been posted.
2701 -- This defends further compilation passes against improper use of
2702 -- the invalid WITH clause node.
2704 Set_Error_Posted (N);
2705 Set_Name (N, Error);
2710 -- If the withed unit is System, and a system extension pragma is
2711 -- present, compile the extension now, rather than waiting for a
2712 -- visibility check on a specific entity.
2714 if Chars (E_Name) = Name_System
2715 and then Scope (E_Name) = Standard_Standard
2716 and then Present (System_Extend_Unit)
2717 and then Present_System_Aux (N)
2719 -- If the extension is not present, an error will have been emitted
2724 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2725 -- to private_with units; they will be made visible later (just before
2726 -- the private part is analyzed)
2728 if Private_Present (N) then
2729 Set_Is_Immediately_Visible (E_Name, False);
2731 end Analyze_With_Clause;
2733 ------------------------------
2734 -- Check_Private_Child_Unit --
2735 ------------------------------
2737 procedure Check_Private_Child_Unit (N : Node_Id) is
2738 Lib_Unit : constant Node_Id := Unit (N);
2740 Curr_Unit : Entity_Id;
2741 Sub_Parent : Node_Id;
2742 Priv_Child : Entity_Id;
2743 Par_Lib : Entity_Id;
2746 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean;
2747 -- Returns true if and only if the library unit is declared with
2748 -- an explicit designation of private.
2750 -----------------------------
2751 -- Is_Private_Library_Unit --
2752 -----------------------------
2754 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is
2755 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit));
2758 return Private_Present (Comp_Unit);
2759 end Is_Private_Library_Unit;
2761 -- Start of processing for Check_Private_Child_Unit
2764 if Nkind_In (Lib_Unit, N_Package_Body, N_Subprogram_Body) then
2765 Curr_Unit := Defining_Entity (Unit (Library_Unit (N)));
2766 Par_Lib := Curr_Unit;
2768 elsif Nkind (Lib_Unit) = N_Subunit then
2770 -- The parent is itself a body. The parent entity is to be found in
2771 -- the corresponding spec.
2773 Sub_Parent := Library_Unit (N);
2774 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent)));
2776 -- If the parent itself is a subunit, Curr_Unit is the entity of the
2777 -- enclosing body, retrieve the spec entity which is the proper
2778 -- ancestor we need for the following tests.
2780 if Ekind (Curr_Unit) = E_Package_Body then
2781 Curr_Unit := Spec_Entity (Curr_Unit);
2784 Par_Lib := Curr_Unit;
2787 Curr_Unit := Defining_Entity (Lib_Unit);
2789 Par_Lib := Curr_Unit;
2790 Par_Spec := Parent_Spec (Lib_Unit);
2792 if No (Par_Spec) then
2795 Par_Lib := Defining_Entity (Unit (Par_Spec));
2799 -- Loop through context items
2801 Item := First (Context_Items (N));
2802 while Present (Item) loop
2804 -- Ada 2005 (AI-262): Allow private_with of a private child package
2805 -- in public siblings
2807 if Nkind (Item) = N_With_Clause
2808 and then not Implicit_With (Item)
2809 and then not Limited_Present (Item)
2810 and then Is_Private_Descendant (Entity (Name (Item)))
2812 Priv_Child := Entity (Name (Item));
2815 Curr_Parent : Entity_Id := Par_Lib;
2816 Child_Parent : Entity_Id := Scope (Priv_Child);
2817 Prv_Ancestor : Entity_Id := Child_Parent;
2818 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit);
2821 -- If the child unit is a public child then locate the nearest
2822 -- private ancestor. Child_Parent will then be set to the
2823 -- parent of that ancestor.
2825 if not Is_Private_Library_Unit (Priv_Child) then
2826 while Present (Prv_Ancestor)
2827 and then not Is_Private_Library_Unit (Prv_Ancestor)
2829 Prv_Ancestor := Scope (Prv_Ancestor);
2832 if Present (Prv_Ancestor) then
2833 Child_Parent := Scope (Prv_Ancestor);
2837 while Present (Curr_Parent)
2838 and then Curr_Parent /= Standard_Standard
2839 and then Curr_Parent /= Child_Parent
2842 Curr_Private or else Is_Private_Library_Unit (Curr_Parent);
2843 Curr_Parent := Scope (Curr_Parent);
2846 if No (Curr_Parent) then
2847 Curr_Parent := Standard_Standard;
2850 if Curr_Parent /= Child_Parent then
2851 if Ekind (Priv_Child) = E_Generic_Package
2852 and then Chars (Priv_Child) in Text_IO_Package_Name
2853 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada
2856 ("& is a nested package, not a compilation unit",
2857 Name (Item), Priv_Child);
2861 ("unit in with clause is private child unit!", Item);
2863 ("\current unit must also have parent&!",
2864 Item, Child_Parent);
2868 or else Private_Present (Item)
2869 or else Nkind_In (Lib_Unit, N_Package_Body, N_Subunit)
2870 or else (Nkind (Lib_Unit) = N_Subprogram_Body
2871 and then not Acts_As_Spec (Parent (Lib_Unit)))
2877 ("current unit must also be private descendant of&",
2878 Item, Child_Parent);
2886 end Check_Private_Child_Unit;
2888 ----------------------
2889 -- Check_Stub_Level --
2890 ----------------------
2892 procedure Check_Stub_Level (N : Node_Id) is
2893 Par : constant Node_Id := Parent (N);
2894 Kind : constant Node_Kind := Nkind (Par);
2897 if Nkind_In (Kind, N_Package_Body,
2901 and then Nkind_In (Parent (Par), N_Compilation_Unit, N_Subunit)
2905 -- In an instance, a missing stub appears at any level. A warning
2906 -- message will have been emitted already for the missing file.
2908 elsif not In_Instance then
2909 Error_Msg_N ("stub cannot appear in an inner scope", N);
2911 elsif Expander_Active then
2912 Error_Msg_N ("missing proper body", N);
2914 end Check_Stub_Level;
2916 ------------------------
2917 -- Expand_With_Clause --
2918 ------------------------
2920 procedure Expand_With_Clause (Item : Node_Id; Nam : Node_Id; N : Node_Id) is
2921 Loc : constant Source_Ptr := Sloc (Nam);
2922 Ent : constant Entity_Id := Entity (Nam);
2926 function Build_Unit_Name (Nam : Node_Id) return Node_Id;
2927 -- Build name to be used in implicit with_clause. In most cases this
2928 -- is the source name, but if renamings are present we must make the
2929 -- original unit visible, not the one it renames. The entity in the
2930 -- with clause is the renamed unit, but the identifier is the one from
2931 -- the source, which allows us to recover the unit renaming.
2933 ---------------------
2934 -- Build_Unit_Name --
2935 ---------------------
2937 function Build_Unit_Name (Nam : Node_Id) return Node_Id is
2942 if Nkind (Nam) = N_Identifier then
2943 return New_Occurrence_Of (Entity (Nam), Loc);
2946 Ent := Entity (Nam);
2948 if Present (Entity (Selector_Name (Nam)))
2949 and then Chars (Entity (Selector_Name (Nam))) /= Chars (Ent)
2951 Nkind (Unit_Declaration_Node (Entity (Selector_Name (Nam))))
2952 = N_Package_Renaming_Declaration
2954 -- The name in the with_clause is of the form A.B.C, and B is
2955 -- given by a renaming declaration. In that case we may not
2956 -- have analyzed the unit for B, but replaced it directly in
2957 -- lib-load with the unit it renames. We have to make A.B
2958 -- visible, so analyze the declaration for B now, in case it
2959 -- has not been done yet.
2961 Ent := Entity (Selector_Name (Nam));
2964 (Unit_Declaration_Node (Entity (Selector_Name (Nam)))));
2968 Make_Expanded_Name (Loc,
2969 Chars => Chars (Entity (Nam)),
2970 Prefix => Build_Unit_Name (Prefix (Nam)),
2971 Selector_Name => New_Occurrence_Of (Ent, Loc));
2972 Set_Entity (Result, Ent);
2975 end Build_Unit_Name;
2977 -- Start of processing for Expand_With_Clause
2980 New_Nodes_OK := New_Nodes_OK + 1;
2982 Make_With_Clause (Loc,
2983 Name => Build_Unit_Name (Nam));
2985 P := Parent (Unit_Declaration_Node (Ent));
2986 Set_Library_Unit (Withn, P);
2987 Set_Corresponding_Spec (Withn, Ent);
2988 Set_First_Name (Withn, True);
2989 Set_Implicit_With (Withn, True);
2991 -- If the unit is a package declaration, a private_with_clause on a
2992 -- child unit implies the implicit with on the parent is also private.
2994 if Nkind (Unit (N)) = N_Package_Declaration then
2995 Set_Private_Present (Withn, Private_Present (Item));
2998 Prepend (Withn, Context_Items (N));
2999 Mark_Rewrite_Insertion (Withn);
3000 Install_Withed_Unit (Withn);
3002 if Nkind (Nam) = N_Expanded_Name then
3003 Expand_With_Clause (Item, Prefix (Nam), N);
3006 New_Nodes_OK := New_Nodes_OK - 1;
3007 end Expand_With_Clause;
3009 -----------------------
3010 -- Get_Parent_Entity --
3011 -----------------------
3013 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is
3015 if Nkind (Unit) = N_Package_Body
3016 and then Nkind (Original_Node (Unit)) = N_Package_Instantiation
3018 return Defining_Entity
3019 (Specification (Instance_Spec (Original_Node (Unit))));
3020 elsif Nkind (Unit) = N_Package_Instantiation then
3021 return Defining_Entity (Specification (Instance_Spec (Unit)));
3023 return Defining_Entity (Unit);
3025 end Get_Parent_Entity;
3027 ---------------------
3028 -- Has_With_Clause --
3029 ---------------------
3031 function Has_With_Clause
3034 Is_Limited : Boolean := False) return Boolean
3038 function Named_Unit (Clause : Node_Id) return Entity_Id;
3039 -- Return the entity for the unit named in a [limited] with clause
3045 function Named_Unit (Clause : Node_Id) return Entity_Id is
3047 if Nkind (Name (Clause)) = N_Selected_Component then
3048 return Entity (Selector_Name (Name (Clause)));
3050 return Entity (Name (Clause));
3054 -- Start of processing for Has_With_Clause
3057 if Present (Context_Items (C_Unit)) then
3058 Item := First (Context_Items (C_Unit));
3059 while Present (Item) loop
3060 if Nkind (Item) = N_With_Clause
3061 and then Limited_Present (Item) = Is_Limited
3062 and then Named_Unit (Item) = Pack
3072 end Has_With_Clause;
3074 -----------------------------
3075 -- Implicit_With_On_Parent --
3076 -----------------------------
3078 procedure Implicit_With_On_Parent
3079 (Child_Unit : Node_Id;
3082 Loc : constant Source_Ptr := Sloc (N);
3083 P : constant Node_Id := Parent_Spec (Child_Unit);
3084 P_Unit : Node_Id := Unit (P);
3085 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit);
3088 function Build_Ancestor_Name (P : Node_Id) return Node_Id;
3089 -- Build prefix of child unit name. Recurse if needed
3091 function Build_Unit_Name return Node_Id;
3092 -- If the unit is a child unit, build qualified name with all ancestors
3094 -------------------------
3095 -- Build_Ancestor_Name --
3096 -------------------------
3098 function Build_Ancestor_Name (P : Node_Id) return Node_Id is
3099 P_Ref : constant Node_Id :=
3100 New_Reference_To (Defining_Entity (P), Loc);
3101 P_Spec : Node_Id := P;
3104 -- Ancestor may have been rewritten as a package body. Retrieve
3105 -- the original spec to trace earlier ancestors.
3107 if Nkind (P) = N_Package_Body
3108 and then Nkind (Original_Node (P)) = N_Package_Instantiation
3110 P_Spec := Original_Node (P);
3113 if No (Parent_Spec (P_Spec)) then
3117 Make_Selected_Component (Loc,
3118 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Spec))),
3119 Selector_Name => P_Ref);
3121 end Build_Ancestor_Name;
3123 ---------------------
3124 -- Build_Unit_Name --
3125 ---------------------
3127 function Build_Unit_Name return Node_Id is
3131 if No (Parent_Spec (P_Unit)) then
3132 return New_Reference_To (P_Name, Loc);
3136 Make_Expanded_Name (Loc,
3137 Chars => Chars (P_Name),
3138 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))),
3139 Selector_Name => New_Reference_To (P_Name, Loc));
3140 Set_Entity (Result, P_Name);
3143 end Build_Unit_Name;
3145 -- Start of processing for Implicit_With_On_Parent
3148 -- The unit of the current compilation may be a package body that
3149 -- replaces an instance node. In this case we need the original instance
3150 -- node to construct the proper parent name.
3152 if Nkind (P_Unit) = N_Package_Body
3153 and then Nkind (Original_Node (P_Unit)) = N_Package_Instantiation
3155 P_Unit := Original_Node (P_Unit);
3158 -- We add the implicit with if the child unit is the current unit being
3159 -- compiled. If the current unit is a body, we do not want to add an
3160 -- implicit_with a second time to the corresponding spec.
3162 if Nkind (Child_Unit) = N_Package_Declaration
3163 and then Child_Unit /= Unit (Cunit (Current_Sem_Unit))
3168 New_Nodes_OK := New_Nodes_OK + 1;
3169 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name);
3171 Set_Library_Unit (Withn, P);
3172 Set_Corresponding_Spec (Withn, P_Name);
3173 Set_First_Name (Withn, True);
3174 Set_Implicit_With (Withn, True);
3176 -- Node is placed at the beginning of the context items, so that
3177 -- subsequent use clauses on the parent can be validated.
3179 Prepend (Withn, Context_Items (N));
3180 Mark_Rewrite_Insertion (Withn);
3181 Install_Withed_Unit (Withn);
3183 if Is_Child_Spec (P_Unit) then
3184 Implicit_With_On_Parent (P_Unit, N);
3187 New_Nodes_OK := New_Nodes_OK - 1;
3188 end Implicit_With_On_Parent;
3194 function In_Chain (E : Entity_Id) return Boolean is
3198 H := Current_Entity (E);
3199 while Present (H) loop
3210 ---------------------
3211 -- Install_Context --
3212 ---------------------
3214 procedure Install_Context (N : Node_Id) is
3215 Lib_Unit : constant Node_Id := Unit (N);
3218 Install_Context_Clauses (N);
3220 if Is_Child_Spec (Lib_Unit) then
3221 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit)));
3224 Install_Limited_Context_Clauses (N);
3225 end Install_Context;
3227 -----------------------------
3228 -- Install_Context_Clauses --
3229 -----------------------------
3231 procedure Install_Context_Clauses (N : Node_Id) is
3232 Lib_Unit : constant Node_Id := Unit (N);
3234 Uname_Node : Entity_Id;
3235 Check_Private : Boolean := False;
3236 Decl_Node : Node_Id;
3237 Lib_Parent : Entity_Id;
3240 -- First skip configuration pragmas at the start of the context. They
3241 -- are not technically part of the context clause, but that's where the
3242 -- parser puts them. Note they were analyzed in Analyze_Context.
3244 Item := First (Context_Items (N));
3245 while Present (Item)
3246 and then Nkind (Item) = N_Pragma
3247 and then Pragma_Name (Item) in Configuration_Pragma_Names
3252 -- Loop through the actual context clause items. We process everything
3253 -- except Limited_With clauses in this routine. Limited_With clauses
3254 -- are separately installed (see Install_Limited_Context_Clauses).
3256 while Present (Item) loop
3258 -- Case of explicit WITH clause
3260 if Nkind (Item) = N_With_Clause
3261 and then not Implicit_With (Item)
3263 if Limited_Present (Item) then
3265 -- Limited withed units will be installed later
3269 -- If Name (Item) is not an entity name, something is wrong, and
3270 -- this will be detected in due course, for now ignore the item
3272 elsif not Is_Entity_Name (Name (Item)) then
3275 elsif No (Entity (Name (Item))) then
3276 Set_Entity (Name (Item), Any_Id);
3280 Uname_Node := Entity (Name (Item));
3282 if Is_Private_Descendant (Uname_Node) then
3283 Check_Private := True;
3286 Install_Withed_Unit (Item);
3288 Decl_Node := Unit_Declaration_Node (Uname_Node);
3290 -- If the unit is a subprogram instance, it appears nested within
3291 -- a package that carries the parent information.
3293 if Is_Generic_Instance (Uname_Node)
3294 and then Ekind (Uname_Node) /= E_Package
3296 Decl_Node := Parent (Parent (Decl_Node));
3299 if Is_Child_Spec (Decl_Node) then
3300 if Nkind (Name (Item)) = N_Expanded_Name then
3301 Expand_With_Clause (Item, Prefix (Name (Item)), N);
3303 -- If not an expanded name, the child unit must be a
3304 -- renaming, nothing to do.
3309 elsif Nkind (Decl_Node) = N_Subprogram_Body
3310 and then not Acts_As_Spec (Parent (Decl_Node))
3311 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node))))
3313 Implicit_With_On_Parent
3314 (Unit (Library_Unit (Parent (Decl_Node))), N);
3317 -- Check license conditions unless this is a dummy unit
3319 if Sloc (Library_Unit (Item)) /= No_Location then
3320 License_Check : declare
3321 Withu : constant Unit_Number_Type :=
3322 Get_Source_Unit (Library_Unit (Item));
3323 Withl : constant License_Type :=
3324 License (Source_Index (Withu));
3325 Unitl : constant License_Type :=
3326 License (Source_Index (Current_Sem_Unit));
3328 procedure License_Error;
3329 -- Signal error of bad license
3335 procedure License_Error is
3338 ("?license of withed unit & may be inconsistent",
3342 -- Start of processing for License_Check
3345 -- Exclude license check if withed unit is an internal unit.
3346 -- This situation arises e.g. with the GPL version of GNAT.
3348 if Is_Internal_File_Name (Unit_File_Name (Withu)) then
3351 -- Otherwise check various cases
3363 if Withl = Restricted then
3367 when Modified_GPL =>
3368 if Withl = Restricted or else Withl = GPL then
3372 when Unrestricted =>
3379 -- Case of USE PACKAGE clause
3381 elsif Nkind (Item) = N_Use_Package_Clause then
3382 Analyze_Use_Package (Item);
3384 -- Case of USE TYPE clause
3386 elsif Nkind (Item) = N_Use_Type_Clause then
3387 Analyze_Use_Type (Item);
3391 elsif Nkind (Item) = N_Pragma then
3399 if Is_Child_Spec (Lib_Unit) then
3401 -- The unit also has implicit with_clauses on its own parents
3403 if No (Context_Items (N)) then
3404 Set_Context_Items (N, New_List);
3407 Implicit_With_On_Parent (Lib_Unit, N);
3410 -- If the unit is a body, the context of the specification must also
3411 -- be installed. That includes private with_clauses in that context.
3413 if Nkind (Lib_Unit) = N_Package_Body
3414 or else (Nkind (Lib_Unit) = N_Subprogram_Body
3415 and then not Acts_As_Spec (N))
3417 Install_Context (Library_Unit (N));
3419 -- Only install private with-clauses of a spec that comes from
3420 -- source, excluding specs created for a subprogram body that is
3423 if Comes_From_Source (Library_Unit (N)) then
3424 Install_Private_With_Clauses
3425 (Defining_Entity (Unit (Library_Unit (N))));
3428 if Is_Child_Spec (Unit (Library_Unit (N))) then
3430 -- If the unit is the body of a public child unit, the private
3431 -- declarations of the parent must be made visible. If the child
3432 -- unit is private, the private declarations have been installed
3433 -- already in the call to Install_Parents for the spec. Installing
3434 -- private declarations must be done for all ancestors of public
3435 -- child units. In addition, sibling units mentioned in the
3436 -- context clause of the body are directly visible.
3444 Lib_Spec := Unit (Library_Unit (N));
3445 while Is_Child_Spec (Lib_Spec) loop
3446 P := Unit (Parent_Spec (Lib_Spec));
3447 P_Name := Defining_Entity (P);
3449 if not (Private_Present (Parent (Lib_Spec)))
3450 and then not In_Private_Part (P_Name)
3452 Install_Private_Declarations (P_Name);
3453 Install_Private_With_Clauses (P_Name);
3454 Set_Use (Private_Declarations (Specification (P)));
3462 -- For a package body, children in context are immediately visible
3464 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N);
3467 if Nkind_In (Lib_Unit, N_Generic_Package_Declaration,
3468 N_Generic_Subprogram_Declaration,
3469 N_Package_Declaration,
3470 N_Subprogram_Declaration)
3472 if Is_Child_Spec (Lib_Unit) then
3473 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit)));
3474 Set_Is_Private_Descendant
3475 (Defining_Entity (Lib_Unit),
3476 Is_Private_Descendant (Lib_Parent)
3477 or else Private_Present (Parent (Lib_Unit)));
3480 Set_Is_Private_Descendant
3481 (Defining_Entity (Lib_Unit),
3482 Private_Present (Parent (Lib_Unit)));
3486 if Check_Private then
3487 Check_Private_Child_Unit (N);
3489 end Install_Context_Clauses;
3491 -------------------------------------
3492 -- Install_Limited_Context_Clauses --
3493 -------------------------------------
3495 procedure Install_Limited_Context_Clauses (N : Node_Id) is
3498 procedure Check_Renamings (P : Node_Id; W : Node_Id);
3499 -- Check that the unlimited view of a given compilation_unit is not
3500 -- already visible through "use + renamings".
3502 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id);
3503 -- Check that if a limited_with clause of a given compilation_unit
3504 -- mentions a descendant of a private child of some library unit, then
3505 -- the given compilation_unit shall be the declaration of a private
3506 -- descendant of that library unit, or a public descendant of such. The
3507 -- code is analogous to that of Check_Private_Child_Unit but we cannot
3508 -- use entities on the limited with_clauses because their units have not
3509 -- been analyzed, so we have to climb the tree of ancestors looking for
3510 -- private keywords.
3512 procedure Expand_Limited_With_Clause
3513 (Comp_Unit : Node_Id;
3516 -- If a child unit appears in a limited_with clause, there are implicit
3517 -- limited_with clauses on all parents that are not already visible
3518 -- through a regular with clause. This procedure creates the implicit
3519 -- limited with_clauses for the parents and loads the corresponding
3520 -- units. The shadow entities are created when the inserted clause is
3521 -- analyzed. Implements Ada 2005 (AI-50217).
3523 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean;
3524 -- When compiling a unit Q descended from some parent unit P, a limited
3525 -- with_clause in the context of P that names some other ancestor of Q
3526 -- must not be installed because the ancestor is immediately visible.
3528 ---------------------
3529 -- Check_Renamings --
3530 ---------------------
3532 procedure Check_Renamings (P : Node_Id; W : Node_Id) is
3541 pragma Assert (Nkind (W) = N_With_Clause);
3543 -- Protect the frontend against previous critical errors
3545 case Nkind (Unit (Library_Unit (W))) is
3546 when N_Subprogram_Declaration |
3547 N_Package_Declaration |
3548 N_Generic_Subprogram_Declaration |
3549 N_Generic_Package_Declaration =>
3556 -- Check "use + renamings"
3558 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W))));
3559 Spec := Specification (Unit (P));
3561 Item := First (Visible_Declarations (Spec));
3562 while Present (Item) loop
3564 -- Look only at use package clauses
3566 if Nkind (Item) = N_Use_Package_Clause then
3568 -- Traverse the list of packages
3570 Nam := First (Names (Item));
3571 while Present (Nam) loop
3574 pragma Assert (Present (Parent (E)));
3576 if Nkind (Parent (E)) = N_Package_Renaming_Declaration
3577 and then Renamed_Entity (E) = WEnt
3579 -- The unlimited view is visible through use clause and
3580 -- renamings. There is no need to generate the error
3581 -- message here because Is_Visible_Through_Renamings
3582 -- takes care of generating the precise error message.
3586 elsif Nkind (Parent (E)) = N_Package_Specification then
3588 -- The use clause may refer to a local package.
3589 -- Check all the enclosing scopes.
3592 while E2 /= Standard_Standard
3600 ("unlimited view visible through use clause ", W);
3612 -- Recursive call to check all the ancestors
3614 if Is_Child_Spec (Unit (P)) then
3615 Check_Renamings (P => Parent_Spec (Unit (P)), W => W);
3617 end Check_Renamings;
3619 ---------------------------------------
3620 -- Check_Private_Limited_Withed_Unit --
3621 ---------------------------------------
3623 procedure Check_Private_Limited_Withed_Unit (Item : Node_Id) is
3624 Curr_Parent : Node_Id;
3625 Child_Parent : Node_Id;
3626 Curr_Private : Boolean;
3629 -- Compilation unit of the parent of the withed library unit
3631 Child_Parent := Library_Unit (Item);
3633 -- If the child unit is a public child, then locate its nearest
3634 -- private ancestor, if any, then Child_Parent will then be set to
3635 -- the parent of that ancestor.
3637 if not Private_Present (Library_Unit (Item)) then
3638 while Present (Child_Parent)
3639 and then not Private_Present (Child_Parent)
3641 Child_Parent := Parent_Spec (Unit (Child_Parent));
3644 if No (Child_Parent) then
3649 Child_Parent := Parent_Spec (Unit (Child_Parent));
3651 -- Traverse all the ancestors of the current compilation unit to
3652 -- check if it is a descendant of named library unit.
3654 Curr_Parent := Parent (Item);
3655 Curr_Private := Private_Present (Curr_Parent);
3657 while Present (Parent_Spec (Unit (Curr_Parent)))
3658 and then Curr_Parent /= Child_Parent
3660 Curr_Parent := Parent_Spec (Unit (Curr_Parent));
3661 Curr_Private := Curr_Private or else Private_Present (Curr_Parent);
3664 if Curr_Parent /= Child_Parent then
3666 ("unit in with clause is private child unit!", Item);
3668 ("\current unit must also have parent&!",
3669 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3671 elsif Private_Present (Parent (Item))
3672 or else Curr_Private
3673 or else Private_Present (Item)
3674 or else Nkind_In (Unit (Parent (Item)), N_Package_Body,
3678 -- Current unit is private, of descendant of a private unit
3684 ("current unit must also be private descendant of&",
3685 Item, Defining_Unit_Name (Specification (Unit (Child_Parent))));
3687 end Check_Private_Limited_Withed_Unit;
3689 --------------------------------
3690 -- Expand_Limited_With_Clause --
3691 --------------------------------
3693 procedure Expand_Limited_With_Clause
3694 (Comp_Unit : Node_Id;
3698 Loc : constant Source_Ptr := Sloc (Nam);
3699 Unum : Unit_Number_Type;
3702 function Previous_Withed_Unit (W : Node_Id) return Boolean;
3703 -- Returns true if the context already includes a with_clause for
3704 -- this unit. If the with_clause is non-limited, the unit is fully
3705 -- visible and an implicit limited_with should not be created. If
3706 -- there is already a limited_with clause for W, a second one is
3707 -- simply redundant.
3709 --------------------------
3710 -- Previous_Withed_Unit --
3711 --------------------------
3713 function Previous_Withed_Unit (W : Node_Id) return Boolean is
3717 -- A limited with_clause cannot appear in the same context_clause
3718 -- as a nonlimited with_clause which mentions the same library.
3720 Item := First (Context_Items (Comp_Unit));
3721 while Present (Item) loop
3722 if Nkind (Item) = N_With_Clause
3723 and then Library_Unit (Item) = Library_Unit (W)
3732 end Previous_Withed_Unit;
3734 -- Start of processing for Expand_Limited_With_Clause
3737 New_Nodes_OK := New_Nodes_OK + 1;
3739 if Nkind (Nam) = N_Identifier then
3741 -- Create node for name of withed unit
3744 Make_With_Clause (Loc,
3745 Name => New_Copy (Nam));
3747 else pragma Assert (Nkind (Nam) = N_Selected_Component);
3749 Make_With_Clause (Loc,
3750 Name => Make_Selected_Component (Loc,
3751 Prefix => New_Copy_Tree (Prefix (Nam)),
3752 Selector_Name => New_Copy (Selector_Name (Nam))));
3753 Set_Parent (Withn, Parent (N));
3756 Set_Limited_Present (Withn);
3757 Set_First_Name (Withn);
3758 Set_Implicit_With (Withn);
3762 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)),
3767 -- Do not generate a limited_with_clause on the current unit. This
3768 -- path is taken when a unit has a limited_with clause on one of its
3771 if Unum = Current_Sem_Unit then
3775 Set_Library_Unit (Withn, Cunit (Unum));
3776 Set_Corresponding_Spec
3777 (Withn, Specification (Unit (Cunit (Unum))));
3779 if not Previous_Withed_Unit (Withn) then
3780 Prepend (Withn, Context_Items (Parent (N)));
3781 Mark_Rewrite_Insertion (Withn);
3783 -- Add implicit limited_with_clauses for parents of child units
3784 -- mentioned in limited_with clauses.
3786 if Nkind (Nam) = N_Selected_Component then
3787 Expand_Limited_With_Clause (Comp_Unit, Prefix (Nam), N);
3792 if not Limited_View_Installed (Withn) then
3793 Install_Limited_Withed_Unit (Withn);
3797 New_Nodes_OK := New_Nodes_OK - 1;
3798 end Expand_Limited_With_Clause;
3800 ----------------------
3801 -- Is_Ancestor_Unit --
3802 ----------------------
3804 function Is_Ancestor_Unit (U1 : Node_Id; U2 : Node_Id) return Boolean is
3805 E1 : constant Entity_Id := Defining_Entity (Unit (U1));
3808 if Nkind_In (Unit (U2), N_Package_Body, N_Subprogram_Body) then
3809 E2 := Defining_Entity (Unit (Library_Unit (U2)));
3810 return Is_Ancestor_Package (E1, E2);
3814 end Is_Ancestor_Unit;
3816 -- Start of processing for Install_Limited_Context_Clauses
3819 Item := First (Context_Items (N));
3820 while Present (Item) loop
3821 if Nkind (Item) = N_With_Clause
3822 and then Limited_Present (Item)
3823 and then not Error_Posted (Item)
3825 if Nkind (Name (Item)) = N_Selected_Component then
3826 Expand_Limited_With_Clause
3827 (Comp_Unit => N, Nam => Prefix (Name (Item)), N => Item);
3830 Check_Private_Limited_Withed_Unit (Item);
3832 if not Implicit_With (Item)
3833 and then Is_Child_Spec (Unit (N))
3835 Check_Renamings (Parent_Spec (Unit (N)), Item);
3838 -- A unit may have a limited with on itself if it has a limited
3839 -- with_clause on one of its child units. In that case it is
3840 -- already being compiled and it makes no sense to install its
3843 -- If the item is a limited_private_with_clause, install it if the
3844 -- current unit is a body or if it is a private child. Otherwise
3845 -- the private clause is installed before analyzing the private
3846 -- part of the current unit.
3848 if Library_Unit (Item) /= Cunit (Current_Sem_Unit)
3849 and then not Limited_View_Installed (Item)
3851 not Is_Ancestor_Unit
3852 (Library_Unit (Item), Cunit (Current_Sem_Unit))
3854 if not Private_Present (Item)
3855 or else Private_Present (N)
3856 or else Nkind_In (Unit (N), N_Package_Body,
3860 Install_Limited_Withed_Unit (Item);
3868 -- Ada 2005 (AI-412): Examine visible declarations of a package spec,
3869 -- looking for incomplete subtype declarations of incomplete types
3870 -- visible through a limited with clause.
3872 if Ada_Version >= Ada_2005
3873 and then Analyzed (N)
3874 and then Nkind (Unit (N)) = N_Package_Declaration
3879 Non_Lim_View : Entity_Id;
3882 Decl := First (Visible_Declarations (Specification (Unit (N))));
3883 while Present (Decl) loop
3884 if Nkind (Decl) = N_Subtype_Declaration
3886 Ekind (Defining_Identifier (Decl)) = E_Incomplete_Subtype
3888 From_With_Type (Defining_Identifier (Decl))
3890 Def_Id := Defining_Identifier (Decl);
3891 Non_Lim_View := Non_Limited_View (Def_Id);
3893 if not Is_Incomplete_Type (Non_Lim_View) then
3895 -- Convert an incomplete subtype declaration into a
3896 -- corresponding non-limited view subtype declaration.
3897 -- This is usually the case when analyzing a body that
3898 -- has regular with clauses, when the spec has limited
3901 -- If the non-limited view is still incomplete, it is
3902 -- the dummy entry already created, and the declaration
3903 -- cannot be reanalyzed. This is the case when installing
3904 -- a parent unit that has limited with-clauses.
3906 Set_Subtype_Indication (Decl,
3907 New_Reference_To (Non_Lim_View, Sloc (Def_Id)));
3908 Set_Etype (Def_Id, Non_Lim_View);
3909 Set_Ekind (Def_Id, Subtype_Kind (Ekind (Non_Lim_View)));
3910 Set_Analyzed (Decl, False);
3912 -- Reanalyze the declaration, suppressing the call to
3913 -- Enter_Name to avoid duplicate names.
3915 Analyze_Subtype_Declaration
3925 end Install_Limited_Context_Clauses;
3927 ---------------------
3928 -- Install_Parents --
3929 ---------------------
3931 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is
3938 P := Unit (Parent_Spec (Lib_Unit));
3939 P_Name := Get_Parent_Entity (P);
3941 if Etype (P_Name) = Any_Type then
3945 if Ekind (P_Name) = E_Generic_Package
3946 and then not Nkind_In (Lib_Unit, N_Generic_Subprogram_Declaration,
3947 N_Generic_Package_Declaration)
3948 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration
3951 ("child of a generic package must be a generic unit", Lib_Unit);
3953 elsif not Is_Package_Or_Generic_Package (P_Name) then
3955 ("parent unit must be package or generic package", Lib_Unit);
3956 raise Unrecoverable_Error;
3958 elsif Present (Renamed_Object (P_Name)) then
3959 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit);
3960 raise Unrecoverable_Error;
3962 -- Verify that a child of an instance is itself an instance, or the
3963 -- renaming of one. Given that an instance that is a unit is replaced
3964 -- with a package declaration, check against the original node. The
3965 -- parent may be currently being instantiated, in which case it appears
3966 -- as a declaration, but the generic_parent is already established
3967 -- indicating that we deal with an instance.
3969 elsif Nkind (Original_Node (P)) = N_Package_Instantiation then
3970 if Nkind (Lib_Unit) in N_Renaming_Declaration
3971 or else Nkind (Original_Node (Lib_Unit)) in N_Generic_Instantiation
3973 (Nkind (Lib_Unit) = N_Package_Declaration
3974 and then Present (Generic_Parent (Specification (Lib_Unit))))
3979 ("child of an instance must be an instance or renaming",
3984 -- This is the recursive call that ensures all parents are loaded
3986 if Is_Child_Spec (P) then
3988 Is_Private or else Private_Present (Parent (Lib_Unit)));
3991 -- Now we can install the context for this parent
3993 Install_Context_Clauses (Parent_Spec (Lib_Unit));
3994 Install_Limited_Context_Clauses (Parent_Spec (Lib_Unit));
3995 Install_Siblings (P_Name, Parent (Lib_Unit));
3997 -- The child unit is in the declarative region of the parent. The parent
3998 -- must therefore appear in the scope stack and be visible, as when
3999 -- compiling the corresponding body. If the child unit is private or it
4000 -- is a package body, private declarations must be accessible as well.
4001 -- Use declarations in the parent must also be installed. Finally, other
4002 -- child units of the same parent that are in the context are
4003 -- immediately visible.
4005 -- Find entity for compilation unit, and set its private descendant
4006 -- status as needed. Indicate that it is a compilation unit, which is
4007 -- redundant in general, but needed if this is a generated child spec
4008 -- for a child body without previous spec.
4010 E_Name := Defining_Entity (Lib_Unit);
4012 Set_Is_Child_Unit (E_Name);
4013 Set_Is_Compilation_Unit (E_Name);
4015 Set_Is_Private_Descendant (E_Name,
4016 Is_Private_Descendant (P_Name)
4017 or else Private_Present (Parent (Lib_Unit)));
4019 P_Spec := Specification (Unit_Declaration_Node (P_Name));
4020 Push_Scope (P_Name);
4022 -- Save current visibility of unit
4024 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility :=
4025 Is_Immediately_Visible (P_Name);
4026 Set_Is_Immediately_Visible (P_Name);
4027 Install_Visible_Declarations (P_Name);
4028 Set_Use (Visible_Declarations (P_Spec));
4030 -- If the parent is a generic unit, its formal part may contain formal
4031 -- packages and use clauses for them.
4033 if Ekind (P_Name) = E_Generic_Package then
4034 Set_Use (Generic_Formal_Declarations (Parent (P_Spec)));
4038 or else Private_Present (Parent (Lib_Unit))
4040 Install_Private_Declarations (P_Name);
4041 Install_Private_With_Clauses (P_Name);
4042 Set_Use (Private_Declarations (P_Spec));
4044 end Install_Parents;
4046 ----------------------------------
4047 -- Install_Private_With_Clauses --
4048 ----------------------------------
4050 procedure Install_Private_With_Clauses (P : Entity_Id) is
4051 Decl : constant Node_Id := Unit_Declaration_Node (P);
4055 if Debug_Flag_I then
4056 Write_Str ("install private with clauses of ");
4057 Write_Name (Chars (P));
4061 if Nkind (Parent (Decl)) = N_Compilation_Unit then
4062 Item := First (Context_Items (Parent (Decl)));
4063 while Present (Item) loop
4064 if Nkind (Item) = N_With_Clause
4065 and then Private_Present (Item)
4067 if Limited_Present (Item) then
4068 if not Limited_View_Installed (Item) then
4069 Install_Limited_Withed_Unit (Item);
4072 Install_Withed_Unit (Item, Private_With_OK => True);
4079 end Install_Private_With_Clauses;
4081 ----------------------
4082 -- Install_Siblings --
4083 ----------------------
4085 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is
4091 -- Iterate over explicit with clauses, and check whether the scope of
4092 -- each entity is an ancestor of the current unit, in which case it is
4093 -- immediately visible.
4095 Item := First (Context_Items (N));
4096 while Present (Item) loop
4098 -- Do not install private_with_clauses declaration, unless unit
4099 -- is itself a private child unit, or is a body. Note that for a
4100 -- subprogram body the private_with_clause does not take effect until
4101 -- after the specification.
4103 if Nkind (Item) /= N_With_Clause
4104 or else Implicit_With (Item)
4105 or else Limited_Present (Item)
4106 or else Error_Posted (Item)
4110 elsif not Private_Present (Item)
4111 or else Private_Present (N)
4112 or else Nkind (Unit (N)) = N_Package_Body
4114 Id := Entity (Name (Item));
4116 if Is_Child_Unit (Id)
4117 and then Is_Ancestor_Package (Scope (Id), U_Name)
4119 Set_Is_Immediately_Visible (Id);
4121 -- Check for the presence of another unit in the context that
4122 -- may be inadvertently hidden by the child.
4124 Prev := Current_Entity (Id);
4127 and then Is_Immediately_Visible (Prev)
4128 and then not Is_Child_Unit (Prev)
4134 Clause := First (Context_Items (N));
4135 while Present (Clause) loop
4136 if Nkind (Clause) = N_With_Clause
4137 and then Entity (Name (Clause)) = Prev
4140 ("child unit& hides compilation unit " &
4141 "with the same name?",
4151 -- The With_Clause may be on a grand-child or one of its further
4152 -- descendants, which makes a child immediately visible. Examine
4153 -- ancestry to determine whether such a child exists. For example,
4154 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
4155 -- is immediately visible.
4157 elsif Is_Child_Unit (Id) then
4163 while Is_Child_Unit (Par) loop
4164 if Is_Ancestor_Package (Scope (Par), U_Name) then
4165 Set_Is_Immediately_Visible (Par);
4174 -- If the item is a private with-clause on a child unit, the parent
4175 -- may have been installed already, but the child unit must remain
4176 -- invisible until installed in a private part or body, unless there
4177 -- is already a regular with_clause for it in the current unit.
4179 elsif Private_Present (Item) then
4180 Id := Entity (Name (Item));
4182 if Is_Child_Unit (Id) then
4186 function In_Context return Boolean;
4187 -- Scan context of current unit, to check whether there is
4188 -- a with_clause on the same unit as a private with-clause
4189 -- on a parent, in which case child unit is visible. If the
4190 -- unit is a grand-child, the same applies to its parent.
4196 function In_Context return Boolean is
4199 First (Context_Items (Cunit (Current_Sem_Unit)));
4200 while Present (Clause) loop
4201 if Nkind (Clause) = N_With_Clause
4202 and then Comes_From_Source (Clause)
4203 and then Is_Entity_Name (Name (Clause))
4204 and then not Private_Present (Clause)
4206 if Entity (Name (Clause)) = Id
4208 (Nkind (Name (Clause)) = N_Expanded_Name
4209 and then Entity (Prefix (Name (Clause))) = Id)
4222 Set_Is_Visible_Child_Unit (Id, In_Context);
4229 end Install_Siblings;
4231 ---------------------------------
4232 -- Install_Limited_Withed_Unit --
4233 ---------------------------------
4235 procedure Install_Limited_Withed_Unit (N : Node_Id) is
4236 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
4239 Is_Child_Package : Boolean := False;
4240 Lim_Header : Entity_Id;
4241 Lim_Typ : Entity_Id;
4243 procedure Check_Body_Required;
4244 -- A unit mentioned in a limited with_clause may not be mentioned in
4245 -- a regular with_clause, but must still be included in the current
4246 -- partition. We need to determine whether the unit needs a body, so
4247 -- that the binder can determine the name of the file to be compiled.
4248 -- Checking whether a unit needs a body can be done without semantic
4249 -- analysis, by examining the nature of the declarations in the package.
4251 function Has_Limited_With_Clause
4252 (C_Unit : Entity_Id;
4253 Pack : Entity_Id) return Boolean;
4254 -- Determine whether any package in the ancestor chain starting with
4255 -- C_Unit has a limited with clause for package Pack.
4257 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean;
4258 -- Check if some package installed though normal with-clauses has a
4259 -- renaming declaration of package P. AARM 10.1.2(21/2).
4261 -------------------------
4262 -- Check_Body_Required --
4263 -------------------------
4265 procedure Check_Body_Required is
4266 PA : constant List_Id :=
4267 Pragmas_After (Aux_Decls_Node (Parent (P_Unit)));
4269 procedure Check_Declarations (Spec : Node_Id);
4270 -- Recursive procedure that does the work and checks nested packages
4272 ------------------------
4273 -- Check_Declarations --
4274 ------------------------
4276 procedure Check_Declarations (Spec : Node_Id) is
4278 Incomplete_Decls : constant Elist_Id := New_Elmt_List;
4280 Subp_List : constant Elist_Id := New_Elmt_List;
4282 procedure Check_Pragma_Import (P : Node_Id);
4283 -- If a pragma import applies to a previous subprogram, the
4284 -- enclosing unit may not need a body. The processing is syntactic
4285 -- and does not require a declaration to be analyzed. The code
4286 -- below also handles pragma Import when applied to a subprogram
4287 -- that renames another. In this case the pragma applies to the
4290 -- Chains of multiple renames are not handled by the code below.
4291 -- It is probably impossible to handle all cases without proper
4292 -- name resolution. In such cases the algorithm is conservative
4293 -- and will indicate that a body is needed???
4295 -------------------------
4296 -- Check_Pragma_Import --
4297 -------------------------
4299 procedure Check_Pragma_Import (P : Node_Id) is
4305 procedure Remove_Homonyms (E : Node_Id);
4306 -- Make one pass over list of subprograms. Called again if
4307 -- subprogram is a renaming. E is known to be an identifier.
4309 ---------------------
4310 -- Remove_Homonyms --
4311 ---------------------
4313 procedure Remove_Homonyms (E : Node_Id) is
4314 R : Entity_Id := Empty;
4315 -- Name of renamed entity, if any
4318 Subp_Id := First_Elmt (Subp_List);
4319 while Present (Subp_Id) loop
4320 if Chars (Node (Subp_Id)) = Chars (E) then
4321 if Nkind (Parent (Parent (Node (Subp_Id))))
4322 /= N_Subprogram_Renaming_Declaration
4325 Next_Elmt (Subp_Id);
4326 Remove_Elmt (Subp_List, Prev_Id);
4328 R := Name (Parent (Parent (Node (Subp_Id))));
4332 Next_Elmt (Subp_Id);
4337 if Nkind (R) = N_Identifier then
4338 Remove_Homonyms (R);
4340 elsif Nkind (R) = N_Selected_Component then
4341 Remove_Homonyms (Selector_Name (R));
4343 -- Renaming of attribute
4349 end Remove_Homonyms;
4351 -- Start of processing for Check_Pragma_Import
4354 -- Find name of entity in Import pragma. We have not analyzed
4355 -- the construct, so we must guard against syntax errors.
4357 Arg := Next (First (Pragma_Argument_Associations (P)));
4360 or else Nkind (Expression (Arg)) /= N_Identifier
4364 Imported := Expression (Arg);
4367 Remove_Homonyms (Imported);
4368 end Check_Pragma_Import;
4370 -- Start of processing for Check_Declarations
4373 -- Search for Elaborate Body pragma
4375 Decl := First (Visible_Declarations (Spec));
4376 while Present (Decl)
4377 and then Nkind (Decl) = N_Pragma
4379 if Get_Pragma_Id (Decl) = Pragma_Elaborate_Body then
4380 Set_Body_Required (Library_Unit (N));
4387 -- Look for declarations that require the presence of a body. We
4388 -- have already skipped pragmas at the start of the list.
4390 while Present (Decl) loop
4392 -- Subprogram that comes from source means body may be needed.
4393 -- Save for subsequent examination of import pragmas.
4395 if Comes_From_Source (Decl)
4396 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4397 N_Subprogram_Renaming_Declaration,
4398 N_Generic_Subprogram_Declaration))
4400 Append_Elmt (Defining_Entity (Decl), Subp_List);
4402 -- Package declaration of generic package declaration. We need
4403 -- to recursively examine nested declarations.
4405 elsif Nkind_In (Decl, N_Package_Declaration,
4406 N_Generic_Package_Declaration)
4408 Check_Declarations (Specification (Decl));
4410 elsif Nkind (Decl) = N_Pragma
4411 and then Pragma_Name (Decl) = Name_Import
4413 Check_Pragma_Import (Decl);
4419 -- Same set of tests for private part. In addition to subprograms
4420 -- detect the presence of Taft Amendment types (incomplete types
4421 -- completed in the body).
4423 Decl := First (Private_Declarations (Spec));
4424 while Present (Decl) loop
4425 if Comes_From_Source (Decl)
4426 and then (Nkind_In (Decl, N_Subprogram_Declaration,
4427 N_Subprogram_Renaming_Declaration,
4428 N_Generic_Subprogram_Declaration))
4430 Append_Elmt (Defining_Entity (Decl), Subp_List);
4432 elsif Nkind_In (Decl, N_Package_Declaration,
4433 N_Generic_Package_Declaration)
4435 Check_Declarations (Specification (Decl));
4437 -- Collect incomplete type declarations for separate pass
4439 elsif Nkind (Decl) = N_Incomplete_Type_Declaration then
4440 Append_Elmt (Decl, Incomplete_Decls);
4442 elsif Nkind (Decl) = N_Pragma
4443 and then Pragma_Name (Decl) = Name_Import
4445 Check_Pragma_Import (Decl);
4451 -- Now check incomplete declarations to locate Taft amendment
4452 -- types. This can be done by examining the defining identifiers
4453 -- of type declarations without real semantic analysis.
4459 Inc := First_Elmt (Incomplete_Decls);
4460 while Present (Inc) loop
4461 Decl := Next (Node (Inc));
4462 while Present (Decl) loop
4463 if Nkind (Decl) = N_Full_Type_Declaration
4464 and then Chars (Defining_Identifier (Decl)) =
4465 Chars (Defining_Identifier (Node (Inc)))
4473 -- If no completion, this is a TAT, and a body is needed
4476 Set_Body_Required (Library_Unit (N));
4484 -- Finally, check whether there are subprograms that still require
4485 -- a body, i.e. are not renamings or null.
4487 if not Is_Empty_Elmt_List (Subp_List) then
4493 Subp_Id := First_Elmt (Subp_List);
4494 Spec := Parent (Node (Subp_Id));
4496 while Present (Subp_Id) loop
4497 if Nkind (Parent (Spec))
4498 = N_Subprogram_Renaming_Declaration
4502 elsif Nkind (Spec) = N_Procedure_Specification
4503 and then Null_Present (Spec)
4508 Set_Body_Required (Library_Unit (N));
4512 Next_Elmt (Subp_Id);
4516 end Check_Declarations;
4518 -- Start of processing for Check_Body_Required
4521 -- If this is an imported package (Java and CIL usage) no body is
4522 -- needed. Scan list of pragmas that may follow a compilation unit
4523 -- to look for a relevant pragma Import.
4525 if Present (PA) then
4531 while Present (Prag) loop
4532 if Nkind (Prag) = N_Pragma
4533 and then Get_Pragma_Id (Prag) = Pragma_Import
4543 Check_Declarations (Specification (P_Unit));
4544 end Check_Body_Required;
4546 -----------------------------
4547 -- Has_Limited_With_Clause --
4548 -----------------------------
4550 function Has_Limited_With_Clause
4551 (C_Unit : Entity_Id;
4552 Pack : Entity_Id) return Boolean
4559 while Present (Par) loop
4560 if Ekind (Par) /= E_Package then
4564 -- Retrieve the Compilation_Unit node for Par and determine if
4565 -- its context clauses contain a limited with for Pack.
4567 Par_Unit := Parent (Parent (Parent (Par)));
4569 if Nkind (Par_Unit) = N_Package_Declaration then
4570 Par_Unit := Parent (Par_Unit);
4573 if Has_With_Clause (Par_Unit, Pack, True) then
4577 -- If there are more ancestors, climb up the tree, otherwise we
4580 if Is_Child_Unit (Par) then
4588 end Has_Limited_With_Clause;
4590 ----------------------------------
4591 -- Is_Visible_Through_Renamings --
4592 ----------------------------------
4594 function Is_Visible_Through_Renamings (P : Entity_Id) return Boolean is
4595 Kind : constant Node_Kind :=
4596 Nkind (Unit (Cunit (Current_Sem_Unit)));
4602 -- Example of the error detected by this subprogram:
4610 -- package Ren_P renames P;
4616 -- limited with P; -- ERROR
4617 -- package R.C is ...
4619 Aux_Unit := Cunit (Current_Sem_Unit);
4622 Item := First (Context_Items (Aux_Unit));
4623 while Present (Item) loop
4624 if Nkind (Item) = N_With_Clause
4625 and then not Limited_Present (Item)
4626 and then Nkind (Unit (Library_Unit (Item))) =
4627 N_Package_Declaration
4630 First (Visible_Declarations
4631 (Specification (Unit (Library_Unit (Item)))));
4632 while Present (Decl) loop
4633 if Nkind (Decl) = N_Package_Renaming_Declaration
4634 and then Entity (Name (Decl)) = P
4636 -- Generate the error message only if the current unit
4637 -- is a package declaration; in case of subprogram
4638 -- bodies and package bodies we just return True to
4639 -- indicate that the limited view must not be
4642 if Kind = N_Package_Declaration then
4644 ("simultaneous visibility of the limited and " &
4645 "unlimited views not allowed", N);
4646 Error_Msg_Sloc := Sloc (Item);
4648 ("\\ unlimited view of & visible through the " &
4649 "context clause #", N, P);
4650 Error_Msg_Sloc := Sloc (Decl);
4651 Error_Msg_NE ("\\ and the renaming #", N, P);
4664 -- If it is a body not acting as spec, follow pointer to the
4665 -- corresponding spec, otherwise follow pointer to parent spec.
4667 if Present (Library_Unit (Aux_Unit))
4668 and then Nkind_In (Unit (Aux_Unit),
4669 N_Package_Body, N_Subprogram_Body)
4671 if Aux_Unit = Library_Unit (Aux_Unit) then
4673 -- Aux_Unit is a body that acts as a spec. Clause has
4674 -- already been flagged as illegal.
4679 Aux_Unit := Library_Unit (Aux_Unit);
4683 Aux_Unit := Parent_Spec (Unit (Aux_Unit));
4686 exit when No (Aux_Unit);
4690 end Is_Visible_Through_Renamings;
4692 -- Start of processing for Install_Limited_Withed_Unit
4695 pragma Assert (not Limited_View_Installed (N));
4697 -- In case of limited with_clause on subprograms, generics, instances,
4698 -- or renamings, the corresponding error was previously posted and we
4699 -- have nothing to do here. If the file is missing altogether, it has
4700 -- no source location.
4702 if Nkind (P_Unit) /= N_Package_Declaration
4703 or else Sloc (P_Unit) = No_Location
4708 P := Defining_Unit_Name (Specification (P_Unit));
4710 -- Handle child packages
4712 if Nkind (P) = N_Defining_Program_Unit_Name then
4713 Is_Child_Package := True;
4714 P := Defining_Identifier (P);
4717 -- Do not install the limited-view if the context of the unit is already
4718 -- available through a regular with clause.
4720 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4721 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4726 -- Do not install the limited-view if the full-view is already visible
4727 -- through renaming declarations.
4729 if Is_Visible_Through_Renamings (P) then
4733 -- Do not install the limited view if this is the unit being analyzed.
4734 -- This unusual case will happen when a unit has a limited_with clause
4735 -- on one of its children. The compilation of the child forces the load
4736 -- of the parent which tries to install the limited view of the child
4737 -- again. Installing the limited view must also be disabled when
4738 -- compiling the body of the child unit.
4740 if P = Cunit_Entity (Current_Sem_Unit)
4742 (Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4743 and then P = Main_Unit_Entity)
4748 -- This scenario is similar to the one above, the difference is that the
4749 -- compilation of sibling Par.Sib forces the load of parent Par which
4750 -- tries to install the limited view of Lim_Pack [1]. However Par.Sib
4751 -- has a with clause for Lim_Pack [2] in its body, and thus needs the
4752 -- non-limited views of all entities from Lim_Pack.
4754 -- limited with Lim_Pack; -- [1]
4755 -- package Par is ... package Lim_Pack is ...
4757 -- with Lim_Pack; -- [2]
4758 -- package Par.Sib is ... package body Par.Sib is ...
4760 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4761 -- Sem_Unit is the body of Par.Sib.
4763 if Ekind (P) = E_Package
4764 and then Ekind (Main_Unit_Entity) = E_Package
4765 and then Is_Child_Unit (Main_Unit_Entity)
4767 -- The body has a regular with clause
4769 and then Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body
4770 and then Has_With_Clause (Cunit (Current_Sem_Unit), P)
4772 -- One of the ancestors has a limited with clause
4774 and then Nkind (Parent (Parent (Main_Unit_Entity))) =
4775 N_Package_Specification
4776 and then Has_Limited_With_Clause (Scope (Main_Unit_Entity), P)
4781 -- A common use of the limited-with is to have a limited-with in the
4782 -- package spec, and a normal with in its package body. For example:
4784 -- limited with X; -- [1]
4788 -- package body A is ...
4790 -- The compilation of A's body installs the context clauses found at [2]
4791 -- and then the context clauses of its specification (found at [1]). As
4792 -- a consequence, at [1] the specification of X has been analyzed and it
4793 -- is immediately visible. According to the semantics of limited-with
4794 -- context clauses we don't install the limited view because the full
4795 -- view of X supersedes its limited view.
4797 if Analyzed (P_Unit)
4799 (Is_Immediately_Visible (P)
4800 or else (Is_Child_Package and then Is_Visible_Child_Unit (P)))
4803 -- The presence of both the limited and the analyzed nonlimited view
4804 -- may also be an error, such as an illegal context for a limited
4805 -- with_clause. In that case, do not process the context item at all.
4807 if Error_Posted (N) then
4811 if Nkind (Unit (Cunit (Current_Sem_Unit))) = N_Package_Body then
4815 Item := First (Context_Items (Cunit (Current_Sem_Unit)));
4816 while Present (Item) loop
4817 if Nkind (Item) = N_With_Clause
4818 and then Comes_From_Source (Item)
4819 and then Entity (Name (Item)) = P
4828 -- If this is a child body, assume that the nonlimited with_clause
4829 -- appears in an ancestor. Could be refined ???
4833 (Unit (Library_Unit (Cunit (Current_Sem_Unit)))))
4840 -- If in package declaration, nonlimited view brought in from
4841 -- parent unit or some error condition.
4847 if Debug_Flag_I then
4848 Write_Str ("install limited view of ");
4849 Write_Name (Chars (P));
4853 -- If the unit has not been analyzed and the limited view has not been
4854 -- already installed then we install it.
4856 if not Analyzed (P_Unit) then
4857 if not In_Chain (P) then
4859 -- Minimum decoration
4861 Set_Ekind (P, E_Package);
4862 Set_Etype (P, Standard_Void_Type);
4863 Set_Scope (P, Standard_Standard);
4865 if Is_Child_Package then
4866 Set_Is_Child_Unit (P);
4867 Set_Is_Visible_Child_Unit (P);
4868 Set_Scope (P, Defining_Entity (Unit (Parent_Spec (P_Unit))));
4871 -- Place entity on visibility structure
4873 Set_Homonym (P, Current_Entity (P));
4874 Set_Current_Entity (P);
4876 if Debug_Flag_I then
4877 Write_Str (" (homonym) chain ");
4878 Write_Name (Chars (P));
4882 -- Install the incomplete view. The first element of the limited
4883 -- view is a header (an E_Package entity) used to reference the
4884 -- first shadow entity in the private part of the package.
4886 Lim_Header := Limited_View (P);
4887 Lim_Typ := First_Entity (Lim_Header);
4889 while Present (Lim_Typ)
4890 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4892 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ));
4893 Set_Current_Entity (Lim_Typ);
4895 if Debug_Flag_I then
4896 Write_Str (" (homonym) chain ");
4897 Write_Name (Chars (Lim_Typ));
4901 Next_Entity (Lim_Typ);
4905 -- If the unit appears in a previous regular with_clause, the regular
4906 -- entities of the public part of the withed package must be replaced
4907 -- by the shadow ones.
4909 -- This code must be kept synchronized with the code that replaces the
4910 -- shadow entities by the real entities (see body of Remove_Limited
4911 -- With_Clause); otherwise the contents of the homonym chains are not
4915 -- Hide all the type entities of the public part of the package to
4916 -- avoid its usage. This is needed to cover all the subtype decla-
4917 -- rations because we do not remove them from the homonym chain.
4919 E := First_Entity (P);
4920 while Present (E) and then E /= First_Private_Entity (P) loop
4922 Set_Was_Hidden (E, Is_Hidden (E));
4929 -- Replace the real entities by the shadow entities of the limited
4930 -- view. The first element of the limited view is a header that is
4931 -- used to reference the first shadow entity in the private part
4932 -- of the package. Successive elements are the limited views of the
4933 -- type (including regular incomplete types) declared in the package.
4935 Lim_Header := Limited_View (P);
4937 Lim_Typ := First_Entity (Lim_Header);
4938 while Present (Lim_Typ)
4939 and then Lim_Typ /= First_Private_Entity (Lim_Header)
4941 pragma Assert (not In_Chain (Lim_Typ));
4943 -- Do not unchain nested packages and child units
4945 if Ekind (Lim_Typ) /= E_Package
4946 and then not Is_Child_Unit (Lim_Typ)
4952 Prev := Current_Entity (Lim_Typ);
4955 -- Replace E in the homonyms list, so that the limited view
4956 -- becomes available.
4958 if E = Non_Limited_View (Lim_Typ) then
4959 Set_Homonym (Lim_Typ, Homonym (Prev));
4960 Set_Current_Entity (Lim_Typ);
4964 E := Homonym (Prev);
4966 -- E may have been removed when installing a previous
4967 -- limited_with_clause.
4971 exit when E = Non_Limited_View (Lim_Typ);
4973 Prev := Homonym (Prev);
4977 Set_Homonym (Lim_Typ, Homonym (Homonym (Prev)));
4978 Set_Homonym (Prev, Lim_Typ);
4983 if Debug_Flag_I then
4984 Write_Str (" (homonym) chain ");
4985 Write_Name (Chars (Lim_Typ));
4990 Next_Entity (Lim_Typ);
4994 -- The package must be visible while the limited-with clause is active
4995 -- because references to the type P.T must resolve in the usual way.
4996 -- In addition, we remember that the limited-view has been installed to
4997 -- uninstall it at the point of context removal.
4999 Set_Is_Immediately_Visible (P);
5000 Set_Limited_View_Installed (N);
5002 -- If unit has not been analyzed in some previous context, check
5003 -- (imperfectly ???) whether it might need a body.
5005 if not Analyzed (P_Unit) then
5006 Check_Body_Required;
5009 -- If the package in the limited_with clause is a child unit, the clause
5010 -- is unanalyzed and appears as a selected component. Recast it as an
5011 -- expanded name so that the entity can be properly set. Use entity of
5012 -- parent, if available, for higher ancestors in the name.
5014 if Nkind (Name (N)) = N_Selected_Component then
5022 while Nkind (Nam) = N_Selected_Component
5023 and then Present (Ent)
5025 Change_Selected_Component_To_Expanded_Name (Nam);
5027 -- Set entity of parent identifiers if the unit is a child
5028 -- unit. This ensures that the tree is properly formed from
5029 -- semantic point of view (e.g. for ASIS queries). The unit
5030 -- entities are not fully analyzed, so we need to follow unit
5031 -- links in the tree.
5033 Set_Entity (Nam, Ent);
5035 Nam := Prefix (Nam);
5038 (Unit (Parent_Spec (Unit_Declaration_Node (Ent))));
5040 -- Set entity of last ancestor
5042 if Nkind (Nam) = N_Identifier then
5043 Set_Entity (Nam, Ent);
5049 Set_Entity (Name (N), P);
5050 Set_From_With_Type (P);
5051 end Install_Limited_Withed_Unit;
5053 -------------------------
5054 -- Install_Withed_Unit --
5055 -------------------------
5057 procedure Install_Withed_Unit
5058 (With_Clause : Node_Id;
5059 Private_With_OK : Boolean := False)
5061 Uname : constant Entity_Id := Entity (Name (With_Clause));
5062 P : constant Entity_Id := Scope (Uname);
5065 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
5066 -- compiling a package declaration and the Private_With_OK flag was not
5067 -- set by the caller. These declarations will be installed later (before
5068 -- analyzing the private part of the package).
5070 if Private_Present (With_Clause)
5071 and then Nkind (Unit (Parent (With_Clause))) = N_Package_Declaration
5072 and then not (Private_With_OK)
5077 if Debug_Flag_I then
5078 if Private_Present (With_Clause) then
5079 Write_Str ("install private withed unit ");
5081 Write_Str ("install withed unit ");
5084 Write_Name (Chars (Uname));
5088 -- We do not apply the restrictions to an internal unit unless we are
5089 -- compiling the internal unit as a main unit. This check is also
5090 -- skipped for dummy units (for missing packages).
5092 if Sloc (Uname) /= No_Location
5093 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit))
5094 or else Current_Sem_Unit = Main_Unit)
5096 Check_Restricted_Unit
5097 (Unit_Name (Get_Source_Unit (Uname)), With_Clause);
5100 if P /= Standard_Standard then
5102 -- If the unit is not analyzed after analysis of the with clause and
5103 -- it is an instantiation then it awaits a body and is the main unit.
5104 -- Its appearance in the context of some other unit indicates a
5105 -- circular dependency (DEC suite perversity).
5107 if not Analyzed (Uname)
5108 and then Nkind (Parent (Uname)) = N_Package_Instantiation
5111 ("instantiation depends on itself", Name (With_Clause));
5113 elsif not Is_Visible_Child_Unit (Uname) then
5115 -- Abandon processing in case of previous errors
5117 if No (Scope (Uname)) then
5118 pragma Assert (Serious_Errors_Detected /= 0);
5122 Set_Is_Visible_Child_Unit (Uname);
5124 -- If the child unit appears in the context of its parent, it is
5125 -- immediately visible.
5127 if In_Open_Scopes (Scope (Uname)) then
5128 Set_Is_Immediately_Visible (Uname);
5131 if Is_Generic_Instance (Uname)
5132 and then Ekind (Uname) in Subprogram_Kind
5134 -- Set flag as well on the visible entity that denotes the
5135 -- instance, which renames the current one.
5137 Set_Is_Visible_Child_Unit
5139 (Defining_Entity (Unit (Library_Unit (With_Clause)))));
5142 -- The parent unit may have been installed already, and may have
5143 -- appeared in a use clause.
5145 if In_Use (Scope (Uname)) then
5146 Set_Is_Potentially_Use_Visible (Uname);
5149 Set_Context_Installed (With_Clause);
5152 elsif not Is_Immediately_Visible (Uname) then
5153 if not Private_Present (With_Clause)
5154 or else Private_With_OK
5156 Set_Is_Immediately_Visible (Uname);
5159 Set_Context_Installed (With_Clause);
5162 -- A with-clause overrides a with-type clause: there are no restric-
5163 -- tions on the use of package entities.
5165 if Ekind (Uname) = E_Package then
5166 Set_From_With_Type (Uname, False);
5169 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
5170 -- unit if there is a visible homograph for it declared in the same
5171 -- declarative region. This pathological case can only arise when an
5172 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
5173 -- G1 has a generic child also named G2, and the context includes with_
5174 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
5175 -- of I1.G2 visible as well. If the child unit is named Standard, do
5176 -- not apply the check to the Standard package itself.
5178 if Is_Child_Unit (Uname)
5179 and then Is_Visible_Child_Unit (Uname)
5180 and then Ada_Version >= Ada_2005
5183 Decl1 : constant Node_Id := Unit_Declaration_Node (P);
5189 U2 := Homonym (Uname);
5191 and then U2 /= Standard_Standard
5194 Decl2 := Unit_Declaration_Node (P2);
5196 if Is_Child_Unit (U2)
5197 and then Is_Visible_Child_Unit (U2)
5199 if Is_Generic_Instance (P)
5200 and then Nkind (Decl1) = N_Package_Declaration
5201 and then Generic_Parent (Specification (Decl1)) = P2
5203 Error_Msg_N ("illegal with_clause", With_Clause);
5205 ("\child unit has visible homograph" &
5206 " (RM 8.3(26), 10.1.1(19))",
5210 elsif Is_Generic_Instance (P2)
5211 and then Nkind (Decl2) = N_Package_Declaration
5212 and then Generic_Parent (Specification (Decl2)) = P
5214 -- With_clause for child unit of instance appears before
5215 -- in the context. We want to place the error message on
5216 -- it, not on the generic child unit itself.
5219 Prev_Clause : Node_Id;
5222 Prev_Clause := First (List_Containing (With_Clause));
5223 while Entity (Name (Prev_Clause)) /= U2 loop
5227 pragma Assert (Present (Prev_Clause));
5228 Error_Msg_N ("illegal with_clause", Prev_Clause);
5230 ("\child unit has visible homograph" &
5231 " (RM 8.3(26), 10.1.1(19))",
5242 end Install_Withed_Unit;
5248 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is
5249 K : constant Node_Kind := Nkind (Lib_Unit);
5252 return (K in N_Generic_Declaration or else
5253 K in N_Generic_Instantiation or else
5254 K in N_Generic_Renaming_Declaration or else
5255 K = N_Package_Declaration or else
5256 K = N_Package_Renaming_Declaration or else
5257 K = N_Subprogram_Declaration or else
5258 K = N_Subprogram_Renaming_Declaration)
5259 and then Present (Parent_Spec (Lib_Unit));
5262 ------------------------------------
5263 -- Is_Legal_Shadow_Entity_In_Body --
5264 ------------------------------------
5266 function Is_Legal_Shadow_Entity_In_Body (T : Entity_Id) return Boolean is
5267 C_Unit : constant Node_Id := Cunit (Current_Sem_Unit);
5269 return Nkind (Unit (C_Unit)) = N_Package_Body
5272 (C_Unit, Cunit_Entity (Get_Source_Unit (Non_Limited_View (T))));
5273 end Is_Legal_Shadow_Entity_In_Body;
5275 -----------------------
5276 -- Load_Needed_Body --
5277 -----------------------
5279 -- N is a generic unit named in a with clause, or else it is a unit that
5280 -- contains a generic unit or an inlined function. In order to perform an
5281 -- instantiation, the body of the unit must be present. If the unit itself
5282 -- is generic, we assume that an instantiation follows, and load & analyze
5283 -- the body unconditionally. This forces analysis of the spec as well.
5285 -- If the unit is not generic, but contains a generic unit, it is loaded on
5286 -- demand, at the point of instantiation (see ch12).
5288 procedure Load_Needed_Body
5291 Do_Analyze : Boolean := True)
5293 Body_Name : Unit_Name_Type;
5294 Unum : Unit_Number_Type;
5296 Save_Style_Check : constant Boolean := Opt.Style_Check;
5297 -- The loading and analysis is done with style checks off
5300 if not GNAT_Mode then
5301 Style_Check := False;
5304 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N)));
5307 (Load_Name => Body_Name,
5313 if Unum = No_Unit then
5317 Compiler_State := Analyzing; -- reset after load
5319 if not Fatal_Error (Unum) or else Try_Semantics then
5320 if Debug_Flag_L then
5321 Write_Str ("*** Loaded generic body");
5326 Semantics (Cunit (Unum));
5333 Style_Check := Save_Style_Check;
5334 end Load_Needed_Body;
5336 -------------------------
5337 -- Build_Limited_Views --
5338 -------------------------
5340 procedure Build_Limited_Views (N : Node_Id) is
5341 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N));
5342 P : constant Entity_Id := Cunit_Entity (Unum);
5344 Spec : Node_Id; -- To denote a package specification
5345 Lim_Typ : Entity_Id; -- To denote shadow entities
5346 Comp_Typ : Entity_Id; -- To denote real entities
5348 Lim_Header : Entity_Id; -- Package entity
5349 Last_Lim_E : Entity_Id := Empty; -- Last limited entity built
5350 Last_Pub_Lim_E : Entity_Id; -- To set the first private entity
5352 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id);
5353 -- Add attributes of an incomplete type to a shadow entity. The same
5354 -- attributes are placed on the real entity, so that gigi receives
5355 -- a consistent view.
5357 procedure Decorate_Package_Specification (P : Entity_Id);
5358 -- Add attributes of a package entity to the entity in a package
5361 procedure Decorate_Tagged_Type
5365 Mark : Boolean := False);
5366 -- Set basic attributes of tagged type T, including its class-wide type.
5367 -- The parameters Loc, Scope are used to decorate the class-wide type.
5368 -- Use flag Mark to label the class-wide type as Materialize_Entity.
5370 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id);
5371 -- Construct list of shadow entities and attach it to entity of
5372 -- package that is mentioned in a limited_with clause.
5374 function New_Internal_Shadow_Entity
5375 (Kind : Entity_Kind;
5376 Sloc_Value : Source_Ptr;
5377 Id_Char : Character) return Entity_Id;
5378 -- Build a new internal entity and append it to the list of shadow
5379 -- entities available through the limited-header
5385 procedure Build_Chain (Scope : Entity_Id; First_Decl : Node_Id) is
5386 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum));
5387 Is_Tagged : Boolean;
5392 while Present (Decl) loop
5394 -- For each library_package_declaration in the environment, there
5395 -- is an implicit declaration of a *limited view* of that library
5396 -- package. The limited view of a package contains:
5398 -- * For each nested package_declaration, a declaration of the
5399 -- limited view of that package, with the same defining-
5400 -- program-unit name.
5402 -- * For each type_declaration in the visible part, an incomplete
5403 -- type-declaration with the same defining_identifier, whose
5404 -- completion is the type_declaration. If the type_declaration
5405 -- is tagged, then the incomplete_type_declaration is tagged
5408 -- The partial view is tagged if the declaration has the
5409 -- explicit keyword, or else if it is a type extension, both
5410 -- of which can be ascertained syntactically.
5412 if Nkind (Decl) = N_Full_Type_Declaration then
5414 (Nkind (Type_Definition (Decl)) = N_Record_Definition
5415 and then Tagged_Present (Type_Definition (Decl)))
5417 (Nkind (Type_Definition (Decl)) = N_Derived_Type_Definition
5420 (Record_Extension_Part (Type_Definition (Decl))));
5422 Comp_Typ := Defining_Identifier (Decl);
5424 if not Analyzed_Unit then
5426 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5428 Decorate_Incomplete_Type (Comp_Typ, Scope);
5432 -- Create shadow entity for type
5435 New_Internal_Shadow_Entity
5436 (Kind => Ekind (Comp_Typ),
5437 Sloc_Value => Sloc (Comp_Typ),
5440 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5441 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5442 Set_From_With_Type (Lim_Typ);
5445 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5447 Decorate_Incomplete_Type (Lim_Typ, Scope);
5450 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5451 Set_Private_Dependents (Lim_Typ, New_Elmt_List);
5453 elsif Nkind_In (Decl, N_Private_Type_Declaration,
5454 N_Incomplete_Type_Declaration,
5455 N_Task_Type_Declaration,
5456 N_Protected_Type_Declaration)
5458 Comp_Typ := Defining_Identifier (Decl);
5461 Nkind_In (Decl, N_Private_Type_Declaration,
5462 N_Incomplete_Type_Declaration)
5463 and then Tagged_Present (Decl);
5465 if not Analyzed_Unit then
5467 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5469 Decorate_Incomplete_Type (Comp_Typ, Scope);
5474 New_Internal_Shadow_Entity
5475 (Kind => Ekind (Comp_Typ),
5476 Sloc_Value => Sloc (Comp_Typ),
5479 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5480 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5481 Set_From_With_Type (Lim_Typ);
5484 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5486 Decorate_Incomplete_Type (Lim_Typ, Scope);
5489 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5491 -- Initialize Private_Depedents, so the field has the proper
5492 -- type, even though the list will remain empty.
5494 Set_Private_Dependents (Lim_Typ, New_Elmt_List);
5496 elsif Nkind (Decl) = N_Private_Extension_Declaration then
5497 Comp_Typ := Defining_Identifier (Decl);
5499 if not Analyzed_Unit then
5500 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope, True);
5503 -- Create shadow entity for type
5506 New_Internal_Shadow_Entity
5507 (Kind => Ekind (Comp_Typ),
5508 Sloc_Value => Sloc (Comp_Typ),
5511 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5512 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5513 Set_From_With_Type (Lim_Typ);
5515 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope);
5516 Set_Non_Limited_View (Lim_Typ, Comp_Typ);
5518 elsif Nkind (Decl) = N_Package_Declaration then
5523 Spec : constant Node_Id := Specification (Decl);
5526 Comp_Typ := Defining_Unit_Name (Spec);
5528 if not Analyzed (Cunit (Unum)) then
5529 Decorate_Package_Specification (Comp_Typ);
5530 Set_Scope (Comp_Typ, Scope);
5534 New_Internal_Shadow_Entity
5535 (Kind => Ekind (Comp_Typ),
5536 Sloc_Value => Sloc (Comp_Typ),
5539 Decorate_Package_Specification (Lim_Typ);
5540 Set_Scope (Lim_Typ, Scope);
5542 Set_Chars (Lim_Typ, Chars (Comp_Typ));
5543 Set_Parent (Lim_Typ, Parent (Comp_Typ));
5544 Set_From_With_Type (Lim_Typ);
5546 -- Note: The non_limited_view attribute is not used
5547 -- for local packages.
5551 First_Decl => First (Visible_Declarations (Spec)));
5559 ------------------------------
5560 -- Decorate_Incomplete_Type --
5561 ------------------------------
5563 procedure Decorate_Incomplete_Type (E : Entity_Id; Scop : Entity_Id) is
5565 Set_Ekind (E, E_Incomplete_Type);
5566 Set_Scope (E, Scop);
5568 Set_Is_First_Subtype (E, True);
5569 Set_Stored_Constraint (E, No_Elist);
5570 Set_Full_View (E, Empty);
5571 Init_Size_Align (E);
5572 end Decorate_Incomplete_Type;
5574 --------------------------
5575 -- Decorate_Tagged_Type --
5576 --------------------------
5578 procedure Decorate_Tagged_Type
5582 Mark : Boolean := False)
5587 Decorate_Incomplete_Type (T, Scop);
5588 Set_Is_Tagged_Type (T);
5590 -- Build corresponding class_wide type, if not previously done
5592 -- Note: The class-wide entity is shared by the limited-view
5593 -- and the full-view.
5595 if No (Class_Wide_Type (T)) then
5596 CW := New_External_Entity (E_Void, Scope (T), Loc, T, 'C', 0, 'T');
5598 -- Set parent to be the same as the parent of the tagged type.
5599 -- We need a parent field set, and it is supposed to point to
5600 -- the declaration of the type. The tagged type declaration
5601 -- essentially declares two separate types, the tagged type
5602 -- itself and the corresponding class-wide type, so it is
5603 -- reasonable for the parent fields to point to the declaration
5606 Set_Parent (CW, Parent (T));
5608 -- Set remaining fields of classwide type
5610 Set_Ekind (CW, E_Class_Wide_Type);
5612 Set_Scope (CW, Scop);
5613 Set_Is_Tagged_Type (CW);
5614 Set_Is_First_Subtype (CW, True);
5615 Init_Size_Align (CW);
5616 Set_Has_Unknown_Discriminants (CW, True);
5617 Set_Class_Wide_Type (CW, CW);
5618 Set_Equivalent_Type (CW, Empty);
5619 Set_From_With_Type (CW, From_With_Type (T));
5620 Set_Materialize_Entity (CW, Mark);
5622 -- Link type to its class-wide type
5624 Set_Class_Wide_Type (T, CW);
5626 end Decorate_Tagged_Type;
5628 ------------------------------------
5629 -- Decorate_Package_Specification --
5630 ------------------------------------
5632 procedure Decorate_Package_Specification (P : Entity_Id) is
5634 -- Place only the most basic attributes
5636 Set_Ekind (P, E_Package);
5637 Set_Etype (P, Standard_Void_Type);
5638 end Decorate_Package_Specification;
5640 --------------------------------
5641 -- New_Internal_Shadow_Entity --
5642 --------------------------------
5644 function New_Internal_Shadow_Entity
5645 (Kind : Entity_Kind;
5646 Sloc_Value : Source_Ptr;
5647 Id_Char : Character) return Entity_Id
5649 E : constant Entity_Id := Make_Temporary (Sloc_Value, Id_Char);
5652 Set_Ekind (E, Kind);
5653 Set_Is_Internal (E, True);
5655 if Kind in Type_Kind then
5656 Init_Size_Align (E);
5659 Append_Entity (E, Lim_Header);
5662 end New_Internal_Shadow_Entity;
5664 -- Start of processing for Build_Limited_Views
5667 pragma Assert (Limited_Present (N));
5669 -- A library_item mentioned in a limited_with_clause is a package
5670 -- declaration, not a subprogram declaration, generic declaration,
5671 -- generic instantiation, or package renaming declaration.
5673 case Nkind (Unit (Library_Unit (N))) is
5674 when N_Package_Declaration =>
5677 when N_Subprogram_Declaration =>
5678 Error_Msg_N ("subprograms not allowed in "
5679 & "limited with_clauses", N);
5682 when N_Generic_Package_Declaration |
5683 N_Generic_Subprogram_Declaration =>
5684 Error_Msg_N ("generics not allowed in "
5685 & "limited with_clauses", N);
5688 when N_Generic_Instantiation =>
5689 Error_Msg_N ("generic instantiations not allowed in "
5690 & "limited with_clauses", N);
5693 when N_Generic_Renaming_Declaration =>
5694 Error_Msg_N ("generic renamings not allowed in "
5695 & "limited with_clauses", N);
5698 when N_Subprogram_Renaming_Declaration =>
5699 Error_Msg_N ("renamed subprograms not allowed in "
5700 & "limited with_clauses", N);
5703 when N_Package_Renaming_Declaration =>
5704 Error_Msg_N ("renamed packages not allowed in "
5705 & "limited with_clauses", N);
5709 raise Program_Error;
5712 -- Check if the chain is already built
5714 Spec := Specification (Unit (Library_Unit (N)));
5716 if Limited_View_Installed (Spec) then
5720 Set_Ekind (P, E_Package);
5722 -- Build the header of the limited_view
5724 Lim_Header := Make_Temporary (Sloc (N), 'Z');
5725 Set_Ekind (Lim_Header, E_Package);
5726 Set_Is_Internal (Lim_Header);
5727 Set_Limited_View (P, Lim_Header);
5729 -- Create the auxiliary chain. All the shadow entities are appended to
5730 -- the list of entities of the limited-view header
5734 First_Decl => First (Visible_Declarations (Spec)));
5736 -- Save the last built shadow entity. It is needed later to set the
5737 -- reference to the first shadow entity in the private part
5739 Last_Pub_Lim_E := Last_Lim_E;
5741 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5742 -- Required to give support to limited-private-with clauses
5744 Build_Chain (Scope => P,
5745 First_Decl => First (Private_Declarations (Spec)));
5747 if Last_Pub_Lim_E /= Empty then
5748 Set_First_Private_Entity
5749 (Lim_Header, Next_Entity (Last_Pub_Lim_E));
5751 Set_First_Private_Entity
5752 (Lim_Header, First_Entity (P));
5755 Set_Limited_View_Installed (Spec);
5756 end Build_Limited_Views;
5758 -------------------------------
5759 -- Check_Body_Needed_For_SAL --
5760 -------------------------------
5762 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is
5764 function Entity_Needs_Body (E : Entity_Id) return Boolean;
5765 -- Determine whether use of entity E might require the presence of its
5766 -- body. For a package this requires a recursive traversal of all nested
5769 ---------------------------
5770 -- Entity_Needed_For_SAL --
5771 ---------------------------
5773 function Entity_Needs_Body (E : Entity_Id) return Boolean is
5777 if Is_Subprogram (E)
5778 and then Has_Pragma_Inline (E)
5782 elsif Ekind_In (E, E_Generic_Function, E_Generic_Procedure) then
5785 elsif Ekind (E) = E_Generic_Package
5787 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration
5788 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5792 elsif Ekind (E) = E_Package
5793 and then Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration
5794 and then Present (Corresponding_Body (Unit_Declaration_Node (E)))
5796 Ent := First_Entity (E);
5797 while Present (Ent) loop
5798 if Entity_Needs_Body (Ent) then
5810 end Entity_Needs_Body;
5812 -- Start of processing for Check_Body_Needed_For_SAL
5815 if Ekind (Unit_Name) = E_Generic_Package
5816 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5817 N_Generic_Package_Declaration
5819 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name)))
5821 Set_Body_Needed_For_SAL (Unit_Name);
5823 elsif Ekind_In (Unit_Name, E_Generic_Procedure, E_Generic_Function) then
5824 Set_Body_Needed_For_SAL (Unit_Name);
5826 elsif Is_Subprogram (Unit_Name)
5827 and then Nkind (Unit_Declaration_Node (Unit_Name)) =
5828 N_Subprogram_Declaration
5829 and then Has_Pragma_Inline (Unit_Name)
5831 Set_Body_Needed_For_SAL (Unit_Name);
5833 elsif Ekind (Unit_Name) = E_Subprogram_Body then
5834 Check_Body_Needed_For_SAL
5835 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5837 elsif Ekind (Unit_Name) = E_Package
5838 and then Entity_Needs_Body (Unit_Name)
5840 Set_Body_Needed_For_SAL (Unit_Name);
5842 elsif Ekind (Unit_Name) = E_Package_Body
5843 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body
5845 Check_Body_Needed_For_SAL
5846 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name)));
5848 end Check_Body_Needed_For_SAL;
5850 --------------------
5851 -- Remove_Context --
5852 --------------------
5854 procedure Remove_Context (N : Node_Id) is
5855 Lib_Unit : constant Node_Id := Unit (N);
5858 -- If this is a child unit, first remove the parent units
5860 if Is_Child_Spec (Lib_Unit) then
5861 Remove_Parents (Lib_Unit);
5864 Remove_Context_Clauses (N);
5867 ----------------------------
5868 -- Remove_Context_Clauses --
5869 ----------------------------
5871 procedure Remove_Context_Clauses (N : Node_Id) is
5873 Unit_Name : Entity_Id;
5876 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5877 -- limited-views first and regular-views later (to maintain the
5880 -- First Phase: Remove limited_with context clauses
5882 Item := First (Context_Items (N));
5883 while Present (Item) loop
5885 -- We are interested only in with clauses which got installed
5888 if Nkind (Item) = N_With_Clause
5889 and then Limited_Present (Item)
5890 and then Limited_View_Installed (Item)
5892 Remove_Limited_With_Clause (Item);
5898 -- Second Phase: Loop through context items and undo regular
5899 -- with_clauses and use_clauses.
5901 Item := First (Context_Items (N));
5902 while Present (Item) loop
5904 -- We are interested only in with clauses which got installed on
5905 -- entry, as indicated by their Context_Installed flag set
5907 if Nkind (Item) = N_With_Clause
5908 and then Limited_Present (Item)
5909 and then Limited_View_Installed (Item)
5913 elsif Nkind (Item) = N_With_Clause
5914 and then Context_Installed (Item)
5916 -- Remove items from one with'ed unit
5918 Unit_Name := Entity (Name (Item));
5919 Remove_Unit_From_Visibility (Unit_Name);
5920 Set_Context_Installed (Item, False);
5922 elsif Nkind (Item) = N_Use_Package_Clause then
5923 End_Use_Package (Item);
5925 elsif Nkind (Item) = N_Use_Type_Clause then
5926 End_Use_Type (Item);
5931 end Remove_Context_Clauses;
5933 --------------------------------
5934 -- Remove_Limited_With_Clause --
5935 --------------------------------
5937 procedure Remove_Limited_With_Clause (N : Node_Id) is
5938 P_Unit : constant Entity_Id := Unit (Library_Unit (N));
5941 Lim_Header : Entity_Id;
5942 Lim_Typ : Entity_Id;
5946 pragma Assert (Limited_View_Installed (N));
5948 -- In case of limited with_clause on subprograms, generics, instances,
5949 -- or renamings, the corresponding error was previously posted and we
5950 -- have nothing to do here.
5952 if Nkind (P_Unit) /= N_Package_Declaration then
5956 P := Defining_Unit_Name (Specification (P_Unit));
5958 -- Handle child packages
5960 if Nkind (P) = N_Defining_Program_Unit_Name then
5961 P := Defining_Identifier (P);
5964 if Debug_Flag_I then
5965 Write_Str ("remove limited view of ");
5966 Write_Name (Chars (P));
5967 Write_Str (" from visibility");
5971 -- Prepare the removal of the shadow entities from visibility. The first
5972 -- element of the limited view is a header (an E_Package entity) that is
5973 -- used to reference the first shadow entity in the private part of the
5976 Lim_Header := Limited_View (P);
5977 Lim_Typ := First_Entity (Lim_Header);
5979 -- Remove package and shadow entities from visibility if it has not
5982 if not Analyzed (P_Unit) then
5984 Set_Is_Immediately_Visible (P, False);
5986 while Present (Lim_Typ) loop
5988 Next_Entity (Lim_Typ);
5991 -- Otherwise this package has already appeared in the closure and its
5992 -- shadow entities must be replaced by its real entities. This code
5993 -- must be kept synchronized with the complementary code in Install
5994 -- Limited_Withed_Unit.
5997 -- Real entities that are type or subtype declarations were hidden
5998 -- from visibility at the point of installation of the limited-view.
5999 -- Now we recover the previous value of the hidden attribute.
6001 E := First_Entity (P);
6002 while Present (E) and then E /= First_Private_Entity (P) loop
6004 Set_Is_Hidden (E, Was_Hidden (E));
6010 while Present (Lim_Typ)
6011 and then Lim_Typ /= First_Private_Entity (Lim_Header)
6013 -- Nested packages and child units were not unchained
6015 if Ekind (Lim_Typ) /= E_Package
6016 and then not Is_Child_Unit (Non_Limited_View (Lim_Typ))
6018 -- If the package has incomplete types, the limited view of the
6019 -- incomplete type is in fact never visible (AI05-129) but we
6020 -- have created a shadow entity E1 for it, that points to E2,
6021 -- a non-limited incomplete type. This in turn has a full view
6022 -- E3 that is the full declaration. There is a corresponding
6023 -- shadow entity E4. When reinstalling the non-limited view,
6024 -- E2 must become the current entity and E3 must be ignored.
6026 E := Non_Limited_View (Lim_Typ);
6028 if Present (Current_Entity (E))
6029 and then Ekind (Current_Entity (E)) = E_Incomplete_Type
6030 and then Full_View (Current_Entity (E)) = E
6033 -- Lim_Typ is the limited view of a full type declaration
6034 -- that has a previous incomplete declaration, i.e. E3 from
6035 -- the previous description. Nothing to insert.
6040 pragma Assert (not In_Chain (E));
6042 Prev := Current_Entity (Lim_Typ);
6044 if Prev = Lim_Typ then
6045 Set_Current_Entity (E);
6048 while Present (Prev)
6049 and then Homonym (Prev) /= Lim_Typ
6051 Prev := Homonym (Prev);
6054 if Present (Prev) then
6055 Set_Homonym (Prev, E);
6059 -- Preserve structure of homonym chain
6061 Set_Homonym (E, Homonym (Lim_Typ));
6065 Next_Entity (Lim_Typ);
6069 -- Indicate that the limited view of the package is not installed
6071 Set_From_With_Type (P, False);
6072 Set_Limited_View_Installed (N, False);
6073 end Remove_Limited_With_Clause;
6075 --------------------
6076 -- Remove_Parents --
6077 --------------------
6079 procedure Remove_Parents (Lib_Unit : Node_Id) is
6082 P_Spec : Node_Id := Empty;
6084 Vis : constant Boolean :=
6085 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility;
6088 if Is_Child_Spec (Lib_Unit) then
6089 P_Spec := Parent_Spec (Lib_Unit);
6091 elsif Nkind (Lib_Unit) = N_Package_Body
6092 and then Nkind (Original_Node (Lib_Unit)) = N_Package_Instantiation
6094 P_Spec := Parent_Spec (Original_Node (Lib_Unit));
6097 if Present (P_Spec) then
6099 P_Name := Get_Parent_Entity (P);
6100 Remove_Context_Clauses (P_Spec);
6101 End_Package_Scope (P_Name);
6102 Set_Is_Immediately_Visible (P_Name, Vis);
6104 -- Remove from visibility the siblings as well, which are directly
6105 -- visible while the parent is in scope.
6107 E := First_Entity (P_Name);
6108 while Present (E) loop
6109 if Is_Child_Unit (E) then
6110 Set_Is_Immediately_Visible (E, False);
6116 Set_In_Package_Body (P_Name, False);
6118 -- This is the recursive call to remove the context of any higher
6119 -- level parent. This recursion ensures that all parents are removed
6120 -- in the reverse order of their installation.
6126 ---------------------------------
6127 -- Remove_Private_With_Clauses --
6128 ---------------------------------
6130 procedure Remove_Private_With_Clauses (Comp_Unit : Node_Id) is
6133 function In_Regular_With_Clause (E : Entity_Id) return Boolean;
6134 -- Check whether a given unit appears in a regular with_clause. Used to
6135 -- determine whether a private_with_clause, implicit or explicit, should
6138 ----------------------------
6139 -- In_Regular_With_Clause --
6140 ----------------------------
6142 function In_Regular_With_Clause (E : Entity_Id) return Boolean
6147 Item := First (Context_Items (Comp_Unit));
6148 while Present (Item) loop
6149 if Nkind (Item) = N_With_Clause
6150 and then Entity (Name (Item)) = E
6151 and then not Private_Present (Item)
6159 end In_Regular_With_Clause;
6161 -- Start of processing for Remove_Private_With_Clauses
6164 Item := First (Context_Items (Comp_Unit));
6165 while Present (Item) loop
6166 if Nkind (Item) = N_With_Clause
6167 and then Private_Present (Item)
6169 -- If private_with_clause is redundant, remove it from context,
6170 -- as a small optimization to subsequent handling of private_with
6171 -- clauses in other nested packages.
6173 if In_Regular_With_Clause (Entity (Name (Item))) then
6175 Nxt : constant Node_Id := Next (Item);
6181 elsif Limited_Present (Item) then
6182 if not Limited_View_Installed (Item) then
6183 Remove_Limited_With_Clause (Item);
6189 Remove_Unit_From_Visibility (Entity (Name (Item)));
6190 Set_Context_Installed (Item, False);
6198 end Remove_Private_With_Clauses;
6200 ---------------------------------
6201 -- Remove_Unit_From_Visibility --
6202 ---------------------------------
6204 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is
6205 P : constant Entity_Id := Scope (Unit_Name);
6208 if Debug_Flag_I then
6209 Write_Str ("remove unit ");
6210 Write_Name (Chars (Unit_Name));
6211 Write_Str (" from visibility");
6215 if P /= Standard_Standard then
6216 Set_Is_Visible_Child_Unit (Unit_Name, False);
6219 Set_Is_Potentially_Use_Visible (Unit_Name, False);
6220 Set_Is_Immediately_Visible (Unit_Name, False);
6221 end Remove_Unit_From_Visibility;
6236 procedure Unchain (E : Entity_Id) is
6240 Prev := Current_Entity (E);
6246 Set_Name_Entity_Id (Chars (E), Homonym (E));
6249 while Present (Prev)
6250 and then Homonym (Prev) /= E
6252 Prev := Homonym (Prev);
6255 if Present (Prev) then
6256 Set_Homonym (Prev, Homonym (E));
6260 if Debug_Flag_I then
6261 Write_Str (" (homonym) unchain ");
6262 Write_Name (Chars (E));
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