1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2015, 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 Aspects
; use Aspects
;
27 with Atree
; use Atree
;
28 with Debug
; use Debug
;
29 with Einfo
; use Einfo
;
30 with Errout
; use Errout
;
31 with Exp_Util
; use Exp_Util
;
32 with Elists
; use Elists
;
33 with Fname
; use Fname
;
34 with Fname
.UF
; use Fname
.UF
;
35 with Freeze
; use Freeze
;
36 with Impunit
; use Impunit
;
37 with Inline
; use Inline
;
39 with Lib
.Load
; use Lib
.Load
;
40 with Lib
.Xref
; use Lib
.Xref
;
41 with Namet
; use Namet
;
42 with Nlists
; use Nlists
;
43 with Nmake
; use Nmake
;
45 with Output
; use Output
;
46 with Par_SCO
; use Par_SCO
;
47 with Restrict
; use Restrict
;
48 with Rident
; use Rident
;
49 with Rtsfind
; use Rtsfind
;
51 with Sem_Aux
; use Sem_Aux
;
52 with Sem_Ch3
; use Sem_Ch3
;
53 with Sem_Ch6
; use Sem_Ch6
;
54 with Sem_Ch7
; use Sem_Ch7
;
55 with Sem_Ch8
; use Sem_Ch8
;
56 with Sem_Dist
; use Sem_Dist
;
57 with Sem_Prag
; use Sem_Prag
;
58 with Sem_Util
; use Sem_Util
;
59 with Sem_Warn
; use Sem_Warn
;
60 with Stand
; use Stand
;
61 with Sinfo
; use Sinfo
;
62 with Sinfo
.CN
; use Sinfo
.CN
;
63 with Sinput
; use Sinput
;
64 with Snames
; use Snames
;
65 with Style
; use Style
;
66 with Stylesw
; use Stylesw
;
67 with Tbuild
; use Tbuild
;
68 with Uname
; use Uname
;
70 package body Sem_Ch10
is
72 -----------------------
73 -- Local Subprograms --
74 -----------------------
76 procedure Analyze_Context
(N
: Node_Id
);
77 -- Analyzes items in the context clause of compilation unit
79 procedure Build_Limited_Views
(N
: Node_Id
);
80 -- Build and decorate the list of shadow entities for a package mentioned
81 -- in a limited_with clause. If the package was not previously analyzed
82 -- then it also performs a basic decoration of the real entities. This is
83 -- required in order to avoid passing non-decorated entities to the
84 -- back-end. Implements Ada 2005 (AI-50217).
86 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
);
87 -- Check whether the source for the body of a compilation unit must be
88 -- included in a standalone library.
90 procedure Check_No_Elab_Code_All
(N
: Node_Id
);
91 -- Carries out possible tests for violation of No_Elab_Code all for withed
92 -- units in the Context_Items of unit N.
94 procedure Check_Private_Child_Unit
(N
: Node_Id
);
95 -- If a with_clause mentions a private child unit, the compilation unit
96 -- must be a member of the same family, as described in 10.1.2.
98 procedure Check_Stub_Level
(N
: Node_Id
);
99 -- Verify that a stub is declared immediately within a compilation unit,
100 -- and not in an inner frame.
102 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
);
103 -- When a child unit appears in a context clause, the implicit withs on
104 -- parents are made explicit, and with clauses are inserted in the context
105 -- clause before the one for the child. If a parent in the with_clause
106 -- is a renaming, the implicit with_clause is on the renaming whose name
107 -- is mentioned in the with_clause, and not on the package it renames.
108 -- N is the compilation unit whose list of context items receives the
109 -- implicit with_clauses.
111 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
);
112 -- Generate cross-reference information for the parents of child units
113 -- and of subunits. N is a defining_program_unit_name, and P_Id is the
114 -- immediate parent scope.
116 function Has_With_Clause
119 Is_Limited
: Boolean := False) return Boolean;
120 -- Determine whether compilation unit C_Unit contains a [limited] with
121 -- clause for package Pack. Use the flag Is_Limited to designate desired
124 procedure Implicit_With_On_Parent
(Child_Unit
: Node_Id
; N
: Node_Id
);
125 -- If the main unit is a child unit, implicit withs are also added for
126 -- all its ancestors.
128 function In_Chain
(E
: Entity_Id
) return Boolean;
129 -- Check that the shadow entity is not already in the homonym chain, for
130 -- example through a limited_with clause in a parent unit.
132 procedure Install_Context_Clauses
(N
: Node_Id
);
133 -- Subsidiary to Install_Context and Install_Parents. Process all with
134 -- and use clauses for current unit and its library unit if any.
136 procedure Install_Limited_Context_Clauses
(N
: Node_Id
);
137 -- Subsidiary to Install_Context. Process only limited with_clauses for
138 -- current unit. Implements Ada 2005 (AI-50217).
140 procedure Install_Limited_Withed_Unit
(N
: Node_Id
);
141 -- Place shadow entities for a limited_with package in the visibility
142 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
144 procedure Install_Withed_Unit
145 (With_Clause
: Node_Id
;
146 Private_With_OK
: Boolean := False);
147 -- If the unit is not a child unit, make unit immediately visible. The
148 -- caller ensures that the unit is not already currently installed. The
149 -- flag Private_With_OK is set true in Install_Private_With_Clauses, which
150 -- is called when compiling the private part of a package, or installing
151 -- the private declarations of a parent unit.
153 procedure Install_Parents
(Lib_Unit
: Node_Id
; Is_Private
: Boolean);
154 -- This procedure establishes the context for the compilation of a child
155 -- unit. If Lib_Unit is a child library spec then the context of the parent
156 -- is installed, and the parent itself made immediately visible, so that
157 -- the child unit is processed in the declarative region of the parent.
158 -- Install_Parents makes a recursive call to itself to ensure that all
159 -- parents are loaded in the nested case. If Lib_Unit is a library body,
160 -- the only effect of Install_Parents is to install the private decls of
161 -- the parents, because the visible parent declarations will have been
162 -- installed as part of the context of the corresponding spec.
164 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
);
165 -- In the compilation of a child unit, a child of any of the ancestor
166 -- units is directly visible if it is visible, because the parent is in
167 -- an enclosing scope. Iterate over context to find child units of U_Name
168 -- or of some ancestor of it.
170 function Is_Ancestor_Unit
(U1
: Node_Id
; U2
: Node_Id
) return Boolean;
171 -- When compiling a unit Q descended from some parent unit P, a limited
172 -- with_clause in the context of P that names some other ancestor of Q
173 -- must not be installed because the ancestor is immediately visible.
175 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean;
176 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
177 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
178 -- a library spec that has a parent. If the call to Is_Child_Spec returns
179 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
180 -- compilation unit for the parent spec.
182 -- Lib_Unit can also be a subprogram body that acts as its own spec. If the
183 -- Parent_Spec is non-empty, this is also a child unit.
185 procedure Remove_Context_Clauses
(N
: Node_Id
);
186 -- Subsidiary of previous one. Remove use_ and with_clauses
188 procedure Remove_Limited_With_Clause
(N
: Node_Id
);
189 -- Remove from visibility the shadow entities introduced for a package
190 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
192 procedure Remove_Parents
(Lib_Unit
: Node_Id
);
193 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
194 -- contexts established by the corresponding call to Install_Parents are
195 -- removed. Remove_Parents contains a recursive call to itself to ensure
196 -- that all parents are removed in the nested case.
198 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
);
199 -- Reset all visibility flags on unit after compiling it, either as a main
200 -- unit or as a unit in the context.
202 procedure Unchain
(E
: Entity_Id
);
203 -- Remove single entity from visibility list
205 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
);
206 -- Common processing for all stubs (subprograms, tasks, packages, and
207 -- protected cases). N is the stub to be analyzed. Once the subunit name
208 -- is established, load and analyze. Nam is the non-overloadable entity
209 -- for which the proper body provides a completion. Subprogram stubs are
210 -- handled differently because they can be declarations.
213 -- A dummy procedure, for debugging use, called just before analyzing the
214 -- main unit (after dealing with any context clauses).
216 --------------------------
217 -- Limited_With_Clauses --
218 --------------------------
220 -- Limited_With clauses are the mechanism chosen for Ada 2005 to support
221 -- mutually recursive types declared in different units. A limited_with
222 -- clause that names package P in the context of unit U makes the types
223 -- declared in the visible part of P available within U, but with the
224 -- restriction that these types can only be used as incomplete types.
225 -- The limited_with clause does not impose a semantic dependence on P,
226 -- and it is possible for two packages to have limited_with_clauses on
227 -- each other without creating an elaboration circularity.
229 -- To support this feature, the analysis of a limited_with clause must
230 -- create an abbreviated view of the package, without performing any
231 -- semantic analysis on it. This "package abstract" contains shadow types
232 -- that are in one-one correspondence with the real types in the package,
233 -- and that have the properties of incomplete types.
235 -- The implementation creates two element lists: one to chain the shadow
236 -- entities, and one to chain the corresponding type entities in the tree
237 -- of the package. Links between corresponding entities in both chains
238 -- allow the compiler to select the proper view of a given type, depending
239 -- on the context. Note that in contrast with the handling of private
240 -- types, the limited view and the non-limited view of a type are treated
241 -- as separate entities, and no entity exchange needs to take place, which
242 -- makes the implementation much simpler than could be feared.
244 ------------------------------
245 -- Analyze_Compilation_Unit --
246 ------------------------------
248 procedure Analyze_Compilation_Unit
(N
: Node_Id
) is
249 procedure Check_Redundant_Withs
250 (Context_Items
: List_Id
;
251 Spec_Context_Items
: List_Id
:= No_List
);
252 -- Determine whether the context list of a compilation unit contains
253 -- redundant with clauses. When checking body clauses against spec
254 -- clauses, set Context_Items to the context list of the body and
255 -- Spec_Context_Items to that of the spec. Parent packages are not
256 -- examined for documentation purposes.
258 ---------------------------
259 -- Check_Redundant_Withs --
260 ---------------------------
262 procedure Check_Redundant_Withs
263 (Context_Items
: List_Id
;
264 Spec_Context_Items
: List_Id
:= No_List
)
268 procedure Process_Body_Clauses
269 (Context_List
: List_Id
;
271 Used
: in out Boolean;
272 Used_Type_Or_Elab
: in out Boolean);
273 -- Examine the context clauses of a package body, trying to match the
274 -- name entity of Clause with any list element. If the match occurs
275 -- on a use package clause set Used to True, for a use type clause or
276 -- pragma Elaborate[_All], set Used_Type_Or_Elab to True.
278 procedure Process_Spec_Clauses
279 (Context_List
: List_Id
;
281 Used
: in out Boolean;
282 Withed
: in out Boolean;
283 Exit_On_Self
: Boolean := False);
284 -- Examine the context clauses of a package spec, trying to match
285 -- the name entity of Clause with any list element. If the match
286 -- occurs on a use package clause, set Used to True, for a with
287 -- package clause other than Clause, set Withed to True. Limited
288 -- with clauses, implicitly generated with clauses and withs
289 -- having pragmas Elaborate or Elaborate_All applied to them are
290 -- skipped. Exit_On_Self is used to control the search loop and
291 -- force an exit whenever Clause sees itself in the search.
293 --------------------------
294 -- Process_Body_Clauses --
295 --------------------------
297 procedure Process_Body_Clauses
298 (Context_List
: List_Id
;
300 Used
: in out Boolean;
301 Used_Type_Or_Elab
: in out Boolean)
303 Nam_Ent
: constant Entity_Id
:= Entity
(Name
(Clause
));
309 function Same_Unit
(N
: Node_Id
; P
: Entity_Id
) return Boolean;
310 -- In an expanded name in a use clause, if the prefix is a renamed
311 -- package, the entity is set to the original package as a result,
312 -- when checking whether the package appears in a previous with
313 -- clause, the renaming has to be taken into account, to prevent
314 -- spurious/incorrect warnings. A common case is use of Text_IO.
320 function Same_Unit
(N
: Node_Id
; P
: Entity_Id
) return Boolean is
322 return Entity
(N
) = P
323 or else (Present
(Renamed_Object
(P
))
324 and then Entity
(N
) = Renamed_Object
(P
));
327 -- Start of processing for Process_Body_Clauses
331 Used_Type_Or_Elab
:= False;
333 Cont_Item
:= First
(Context_List
);
334 while Present
(Cont_Item
) loop
336 -- Package use clause
338 if Nkind
(Cont_Item
) = N_Use_Package_Clause
341 -- Search through use clauses
343 Use_Item
:= First
(Names
(Cont_Item
));
344 while Present
(Use_Item
) and then not Used
loop
346 -- Case of a direct use of the one we are looking for
348 if Entity
(Use_Item
) = Nam_Ent
then
351 -- Handle nested case, as in "with P; use P.Q.R"
358 -- Loop through prefixes looking for match
361 while Nkind
(UE
) = N_Expanded_Name
loop
362 if Same_Unit
(Prefix
(UE
), Nam_Ent
) then
377 elsif Nkind
(Cont_Item
) = N_Use_Type_Clause
378 and then not Used_Type_Or_Elab
380 Subt_Mark
:= First
(Subtype_Marks
(Cont_Item
));
381 while Present
(Subt_Mark
)
382 and then not Used_Type_Or_Elab
384 if Same_Unit
(Prefix
(Subt_Mark
), Nam_Ent
) then
385 Used_Type_Or_Elab
:= True;
391 -- Pragma Elaborate or Elaborate_All
393 elsif Nkind
(Cont_Item
) = N_Pragma
395 Nam_In
(Pragma_Name
(Cont_Item
), Name_Elaborate
,
397 and then not Used_Type_Or_Elab
400 First
(Pragma_Argument_Associations
(Cont_Item
));
401 while Present
(Prag_Unit
) and then not Used_Type_Or_Elab
loop
402 if Entity
(Expression
(Prag_Unit
)) = Nam_Ent
then
403 Used_Type_Or_Elab
:= True;
412 end Process_Body_Clauses
;
414 --------------------------
415 -- Process_Spec_Clauses --
416 --------------------------
418 procedure Process_Spec_Clauses
419 (Context_List
: List_Id
;
421 Used
: in out Boolean;
422 Withed
: in out Boolean;
423 Exit_On_Self
: Boolean := False)
425 Nam_Ent
: constant Entity_Id
:= Entity
(Name
(Clause
));
433 Cont_Item
:= First
(Context_List
);
434 while Present
(Cont_Item
) loop
436 -- Stop the search since the context items after Cont_Item have
437 -- already been examined in a previous iteration of the reverse
438 -- loop in Check_Redundant_Withs.
441 and Cont_Item
= Clause
446 -- Package use clause
448 if Nkind
(Cont_Item
) = N_Use_Package_Clause
451 Use_Item
:= First
(Names
(Cont_Item
));
452 while Present
(Use_Item
) and then not Used
loop
453 if Entity
(Use_Item
) = Nam_Ent
then
460 -- Package with clause. Avoid processing self, implicitly
461 -- generated with clauses or limited with clauses. Note that
462 -- we examine with clauses having pragmas Elaborate or
463 -- Elaborate_All applied to them due to cases such as:
467 -- pragma Elaborate (Pack);
469 -- In this case, the second with clause is redundant since
470 -- the pragma applies only to the first "with Pack;".
472 -- Note that we only consider with_clauses that comes from
473 -- source. In the case of renamings used as prefixes of names
474 -- in with_clauses, we generate a with_clause for the prefix,
475 -- which we do not treat as implicit because it is needed for
476 -- visibility analysis, but is also not redundant.
478 elsif Nkind
(Cont_Item
) = N_With_Clause
479 and then not Implicit_With
(Cont_Item
)
480 and then Comes_From_Source
(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 -- With_clauses introduced for renamings of parent clauses
507 -- are not marked implicit because they need to be properly
508 -- installed, but they do not come from source and do not
511 and then Comes_From_Source
(Clause
)
513 -- Package body-to-spec check
515 if Present
(Spec_Context_Items
) then
517 Used_In_Body
: Boolean := False;
518 Used_In_Spec
: Boolean := False;
519 Used_Type_Or_Elab
: Boolean := False;
520 Withed_In_Spec
: Boolean := False;
524 (Context_List
=> Spec_Context_Items
,
526 Used
=> Used_In_Spec
,
527 Withed
=> Withed_In_Spec
);
530 (Context_List
=> Context_Items
,
532 Used
=> Used_In_Body
,
533 Used_Type_Or_Elab
=> Used_Type_Or_Elab
);
535 -- "Type Elab" refers to the presence of either a use
536 -- type clause, pragmas Elaborate or Elaborate_All.
538 -- +---------------+---------------------------+------+
539 -- | Spec | Body | Warn |
540 -- +--------+------+--------+------+-----------+------+
541 -- | Withed | Used | Withed | Used | Type Elab | |
542 -- | X | | X | | | X |
543 -- | X | | X | X | | |
544 -- | X | | X | | X | |
545 -- | X | | X | X | X | |
546 -- | X | X | X | | | X |
547 -- | X | X | X | | X | |
548 -- | X | X | X | X | | X |
549 -- | X | X | X | X | X | |
550 -- +--------+------+--------+------+-----------+------+
553 and then not Used_Type_Or_Elab
)
555 ((not Used_In_Spec
and then not Used_In_Body
)
556 or else Used_In_Spec
)
558 Error_Msg_N
-- CODEFIX
559 ("redundant with clause in body??", Clause
);
562 Used_In_Body
:= False;
563 Used_In_Spec
:= False;
564 Used_Type_Or_Elab
:= False;
565 Withed_In_Spec
:= False;
568 -- Standalone package spec or body check
572 Dont_Care
: Boolean := False;
573 Withed
: Boolean := False;
576 -- The mechanism for examining the context clauses of a
577 -- package spec can be applied to package body clauses.
580 (Context_List
=> Context_Items
,
584 Exit_On_Self
=> True);
587 Error_Msg_N
-- CODEFIX
588 ("redundant with clause??", Clause
);
596 end Check_Redundant_Withs
;
600 Main_Cunit
: constant Node_Id
:= Cunit
(Main_Unit
);
601 Unit_Node
: constant Node_Id
:= Unit
(N
);
602 Lib_Unit
: Node_Id
:= Library_Unit
(N
);
603 Par_Spec_Name
: Unit_Name_Type
;
605 Unum
: Unit_Number_Type
;
607 -- Start of processing for Analyze_Compilation_Unit
610 Process_Compilation_Unit_Pragmas
(N
);
612 -- If the unit is a subunit whose parent has not been analyzed (which
613 -- indicates that the main unit is a subunit, either the current one or
614 -- one of its descendents) then the subunit is compiled as part of the
615 -- analysis of the parent, which we proceed to do. Basically this gets
616 -- handled from the top down and we don't want to do anything at this
617 -- level (i.e. this subunit will be handled on the way down from the
618 -- parent), so at this level we immediately return. If the subunit ends
619 -- up not analyzed, it means that the parent did not contain a stub for
620 -- it, or that there errors were detected in some ancestor.
622 if Nkind
(Unit_Node
) = N_Subunit
and then not Analyzed
(Lib_Unit
) then
623 Semantics
(Lib_Unit
);
625 if not Analyzed
(Proper_Body
(Unit_Node
)) then
626 if Serious_Errors_Detected
> 0 then
627 Error_Msg_N
("subunit not analyzed (errors in parent unit)", N
);
629 Error_Msg_N
("missing stub for subunit", N
);
636 -- Analyze context (this will call Sem recursively for with'ed units) To
637 -- detect circularities among with-clauses that are not caught during
638 -- loading, we set the Context_Pending flag on the current unit. If the
639 -- flag is already set there is a potential circularity. We exclude
640 -- predefined units from this check because they are known to be safe.
641 -- We also exclude package bodies that are present because circularities
642 -- between bodies are harmless (and necessary).
644 if Context_Pending
(N
) then
646 Circularity
: Boolean := True;
649 if Is_Predefined_File_Name
650 (Unit_File_Name
(Get_Source_Unit
(Unit
(N
))))
652 Circularity
:= False;
655 for U
in Main_Unit
+ 1 .. Last_Unit
loop
656 if Nkind
(Unit
(Cunit
(U
))) = N_Package_Body
657 and then not Analyzed
(Cunit
(U
))
659 Circularity
:= False;
666 Error_Msg_N
("circular dependency caused by with_clauses", N
);
668 ("\possibly missing limited_with clause"
669 & " in one of the following", N
);
671 for U
in Main_Unit
.. Last_Unit
loop
672 if Context_Pending
(Cunit
(U
)) then
673 Error_Msg_Unit_1
:= Get_Unit_Name
(Unit
(Cunit
(U
)));
674 Error_Msg_N
("\unit$", N
);
678 raise Unrecoverable_Error
;
682 Set_Context_Pending
(N
);
687 Set_Context_Pending
(N
, False);
689 -- If the unit is a package body, the spec is already loaded and must be
690 -- analyzed first, before we analyze the body.
692 if Nkind
(Unit_Node
) = N_Package_Body
then
694 -- If no Lib_Unit, then there was a serious previous error, so just
695 -- ignore the entire analysis effort
697 if No
(Lib_Unit
) then
698 Check_Error_Detected
;
702 -- Analyze the package spec
704 Semantics
(Lib_Unit
);
706 -- Check for unused with's
708 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
710 -- Verify that the library unit is a package declaration
712 if not Nkind_In
(Unit
(Lib_Unit
), N_Package_Declaration
,
713 N_Generic_Package_Declaration
)
716 ("no legal package declaration for package body", N
);
719 -- Otherwise, the entity in the declaration is visible. Update the
720 -- version to reflect dependence of this body on the spec.
723 Spec_Id
:= Defining_Entity
(Unit
(Lib_Unit
));
724 Set_Is_Immediately_Visible
(Spec_Id
, True);
725 Version_Update
(N
, Lib_Unit
);
727 if Nkind
(Defining_Unit_Name
(Unit_Node
)) =
728 N_Defining_Program_Unit_Name
730 Generate_Parent_References
(Unit_Node
, Scope
(Spec_Id
));
735 -- If the unit is a subprogram body, then we similarly need to analyze
736 -- its spec. However, things are a little simpler in this case, because
737 -- here, this analysis is done mostly for error checking and consistency
738 -- purposes (but not only, e.g. there could be a contract on the spec),
739 -- so there's nothing else to be done.
741 elsif Nkind
(Unit_Node
) = N_Subprogram_Body
then
742 if Acts_As_Spec
(N
) then
744 -- If the subprogram body is a child unit, we must create a
745 -- declaration for it, in order to properly load the parent(s).
746 -- After this, the original unit does not acts as a spec, because
747 -- there is an explicit one. If this unit appears in a context
748 -- clause, then an implicit with on the parent will be added when
749 -- installing the context. If this is the main unit, there is no
750 -- Unit_Table entry for the declaration (it has the unit number
751 -- of the main unit) and code generation is unaffected.
753 Unum
:= Get_Cunit_Unit_Number
(N
);
754 Par_Spec_Name
:= Get_Parent_Spec_Name
(Unit_Name
(Unum
));
756 if Par_Spec_Name
/= No_Unit_Name
then
759 (Load_Name
=> Par_Spec_Name
,
764 if Unum
/= No_Unit
then
766 -- Build subprogram declaration and attach parent unit to it
767 -- This subprogram declaration does not come from source,
768 -- Nevertheless the backend must generate debugging info for
769 -- it, and this must be indicated explicitly. We also mark
770 -- the body entity as a child unit now, to prevent a
771 -- cascaded error if the spec entity cannot be entered
772 -- in its scope. Finally we create a Units table entry for
773 -- the subprogram declaration, to maintain a one-to-one
774 -- correspondence with compilation unit nodes. This is
775 -- critical for the tree traversals performed by CodePeer.
778 Loc
: constant Source_Ptr
:= Sloc
(N
);
779 SCS
: constant Boolean :=
780 Get_Comes_From_Source_Default
;
783 Set_Comes_From_Source_Default
(False);
785 -- Checks for redundant USE TYPE clauses have a special
786 -- exception for the synthetic spec we create here. This
787 -- special case relies on the two compilation units
788 -- sharing the same context clause.
790 -- Note: We used to do a shallow copy (New_Copy_List),
791 -- which defeated those checks and also created malformed
792 -- trees (subtype mark shared by two distinct
793 -- N_Use_Type_Clause nodes) which crashed the compiler.
796 Make_Compilation_Unit
(Loc
,
797 Context_Items
=> Context_Items
(N
),
799 Make_Subprogram_Declaration
(Sloc
(N
),
802 (Specification
(Unit_Node
))),
804 Make_Compilation_Unit_Aux
(Loc
));
806 Set_Library_Unit
(N
, Lib_Unit
);
807 Set_Parent_Spec
(Unit
(Lib_Unit
), Cunit
(Unum
));
808 Make_Child_Decl_Unit
(N
);
809 Semantics
(Lib_Unit
);
811 -- Now that a separate declaration exists, the body
812 -- of the child unit does not act as spec any longer.
814 Set_Acts_As_Spec
(N
, False);
815 Set_Is_Child_Unit
(Defining_Entity
(Unit_Node
));
816 Set_Debug_Info_Needed
(Defining_Entity
(Unit
(Lib_Unit
)));
817 Set_Comes_From_Source_Default
(SCS
);
822 -- Here for subprogram with separate declaration
825 Semantics
(Lib_Unit
);
826 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
827 Version_Update
(N
, Lib_Unit
);
830 -- If this is a child unit, generate references to the parents
832 if Nkind
(Defining_Unit_Name
(Specification
(Unit_Node
))) =
833 N_Defining_Program_Unit_Name
835 Generate_Parent_References
836 (Specification
(Unit_Node
),
837 Scope
(Defining_Entity
(Unit
(Lib_Unit
))));
841 -- If it is a child unit, the parent must be elaborated first and we
842 -- update version, since we are dependent on our parent.
844 if Is_Child_Spec
(Unit_Node
) then
846 -- The analysis of the parent is done with style checks off
849 Save_Style_Check
: constant Boolean := Style_Check
;
852 if not GNAT_Mode
then
853 Style_Check
:= False;
856 Semantics
(Parent_Spec
(Unit_Node
));
857 Version_Update
(N
, Parent_Spec
(Unit_Node
));
859 -- Restore style check settings
861 Style_Check
:= Save_Style_Check
;
865 -- With the analysis done, install the context. Note that we can't
866 -- install the context from the with clauses as we analyze them, because
867 -- each with clause must be analyzed in a clean visibility context, so
868 -- we have to wait and install them all at once.
872 if Is_Child_Spec
(Unit_Node
) then
874 -- Set the entities of all parents in the program_unit_name
876 Generate_Parent_References
877 (Unit_Node
, Get_Parent_Entity
(Unit
(Parent_Spec
(Unit_Node
))));
880 -- All components of the context: with-clauses, library unit, ancestors
881 -- if any, (and their context) are analyzed and installed.
883 -- Call special debug routine sm if this is the main unit
885 if Current_Sem_Unit
= Main_Unit
then
889 -- Now analyze the unit (package, subprogram spec, body) itself
893 if Warn_On_Redundant_Constructs
then
894 Check_Redundant_Withs
(Context_Items
(N
));
896 if Nkind
(Unit_Node
) = N_Package_Body
then
897 Check_Redundant_Withs
898 (Context_Items
=> Context_Items
(N
),
899 Spec_Context_Items
=> Context_Items
(Lib_Unit
));
903 -- The above call might have made Unit_Node an N_Subprogram_Body from
904 -- something else, so propagate any Acts_As_Spec flag.
906 if Nkind
(Unit_Node
) = N_Subprogram_Body
907 and then Acts_As_Spec
(Unit_Node
)
909 Set_Acts_As_Spec
(N
);
912 -- Register predefined units in Rtsfind
915 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Sloc
(N
));
917 if Is_Predefined_File_Name
(Unit_File_Name
(Unum
)) then
918 Set_RTU_Loaded
(Unit_Node
);
922 -- Treat compilation unit pragmas that appear after the library unit
924 if Present
(Pragmas_After
(Aux_Decls_Node
(N
))) then
926 Prag_Node
: Node_Id
:= First
(Pragmas_After
(Aux_Decls_Node
(N
)));
928 while Present
(Prag_Node
) loop
935 -- Analyze the contract of a [generic] subprogram that acts as a
936 -- compilation unit after all compilation pragmas have been analyzed.
938 if Nkind_In
(Unit_Node
, N_Generic_Subprogram_Declaration
,
939 N_Subprogram_Declaration
)
941 Analyze_Subprogram_Contract
(Defining_Entity
(Unit_Node
));
944 -- Generate distribution stubs if requested and no error
947 and then (Distribution_Stub_Mode
= Generate_Receiver_Stub_Body
949 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
950 and then Fatal_Error
(Main_Unit
) /= Error_Detected
952 if Is_RCI_Pkg_Spec_Or_Body
(N
) then
954 -- Regular RCI package
956 Add_Stub_Constructs
(N
);
958 elsif (Nkind
(Unit_Node
) = N_Package_Declaration
959 and then Is_Shared_Passive
(Defining_Entity
960 (Specification
(Unit_Node
))))
961 or else (Nkind
(Unit_Node
) = N_Package_Body
963 Is_Shared_Passive
(Corresponding_Spec
(Unit_Node
)))
965 -- Shared passive package
967 Add_Stub_Constructs
(N
);
969 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
971 Is_Remote_Call_Interface
972 (Defining_Entity
(Specification
(Instance_Spec
(Unit_Node
))))
974 -- Instantiation of a RCI generic package
976 Add_Stub_Constructs
(N
);
980 -- Remove unit from visibility, so that environment is clean for the
981 -- next compilation, which is either the main unit or some other unit
984 if Nkind_In
(Unit_Node
, N_Package_Declaration
,
985 N_Package_Renaming_Declaration
,
986 N_Subprogram_Declaration
)
987 or else Nkind
(Unit_Node
) in N_Generic_Declaration
988 or else (Nkind
(Unit_Node
) = N_Subprogram_Body
989 and then Acts_As_Spec
(Unit_Node
))
991 Remove_Unit_From_Visibility
(Defining_Entity
(Unit_Node
));
993 -- If the unit is an instantiation whose body will be elaborated for
994 -- inlining purposes, use the proper entity of the instance. The entity
995 -- may be missing if the instantiation was illegal.
997 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
998 and then not Error_Posted
(Unit_Node
)
999 and then Present
(Instance_Spec
(Unit_Node
))
1001 Remove_Unit_From_Visibility
1002 (Defining_Entity
(Instance_Spec
(Unit_Node
)));
1004 elsif Nkind
(Unit_Node
) = N_Package_Body
1005 or else (Nkind
(Unit_Node
) = N_Subprogram_Body
1006 and then not Acts_As_Spec
(Unit_Node
))
1008 -- Bodies that are not the main unit are compiled if they are generic
1009 -- or contain generic or inlined units. Their analysis brings in the
1010 -- context of the corresponding spec (unit declaration) which must be
1011 -- removed as well, to return the compilation environment to its
1014 Remove_Context
(Lib_Unit
);
1015 Set_Is_Immediately_Visible
(Defining_Entity
(Unit
(Lib_Unit
)), False);
1018 -- Last step is to deinstall the context we just installed as well as
1019 -- the unit just compiled.
1023 -- If this is the main unit and we are generating code, we must check
1024 -- that all generic units in the context have a body if they need it,
1025 -- even if they have not been instantiated. In the absence of .ali files
1026 -- for generic units, we must force the load of the body, just to
1027 -- produce the proper error if the body is absent. We skip this
1028 -- verification if the main unit itself is generic.
1030 if Get_Cunit_Unit_Number
(N
) = Main_Unit
1031 and then Operating_Mode
= Generate_Code
1032 and then Expander_Active
1034 -- Check whether the source for the body of the unit must be included
1035 -- in a standalone library.
1037 Check_Body_Needed_For_SAL
(Cunit_Entity
(Main_Unit
));
1039 -- Indicate that the main unit is now analyzed, to catch possible
1040 -- circularities between it and generic bodies. Remove main unit from
1041 -- visibility. This might seem superfluous, but the main unit must
1042 -- not be visible in the generic body expansions that follow.
1044 Set_Analyzed
(N
, True);
1045 Set_Is_Immediately_Visible
(Cunit_Entity
(Main_Unit
), False);
1050 Un
: Unit_Number_Type
;
1052 Save_Style_Check
: constant Boolean := Style_Check
;
1055 Item
:= First
(Context_Items
(N
));
1056 while Present
(Item
) loop
1058 -- Check for explicit with clause
1060 if Nkind
(Item
) = N_With_Clause
1061 and then not Implicit_With
(Item
)
1063 -- Ada 2005 (AI-50217): Ignore limited-withed units
1065 and then not Limited_Present
(Item
)
1067 Nam
:= Entity
(Name
(Item
));
1069 -- Compile generic subprogram, unless it is intrinsic or
1070 -- imported so no body is required, or generic package body
1071 -- if the package spec requires a body.
1073 if (Is_Generic_Subprogram
(Nam
)
1074 and then not Is_Intrinsic_Subprogram
(Nam
)
1075 and then not Is_Imported
(Nam
))
1076 or else (Ekind
(Nam
) = E_Generic_Package
1077 and then Unit_Requires_Body
(Nam
))
1079 Style_Check
:= False;
1081 if Present
(Renamed_Object
(Nam
)) then
1084 (Load_Name
=> Get_Body_Name
1086 (Unit_Declaration_Node
1087 (Renamed_Object
(Nam
)))),
1095 (Load_Name
=> Get_Body_Name
1096 (Get_Unit_Name
(Item
)),
1103 if Un
= No_Unit
then
1105 ("body of generic unit& not found", Item
, Nam
);
1108 elsif not Analyzed
(Cunit
(Un
))
1109 and then Un
/= Main_Unit
1110 and then Fatal_Error
(Un
) /= Error_Detected
1112 Style_Check
:= False;
1113 Semantics
(Cunit
(Un
));
1121 -- Restore style checks settings
1123 Style_Check
:= Save_Style_Check
;
1127 -- Deal with creating elaboration counter if needed. We create an
1128 -- elaboration counter only for units that come from source since
1129 -- units manufactured by the compiler never need elab checks.
1131 if Comes_From_Source
(N
)
1132 and then Nkind_In
(Unit_Node
, N_Package_Declaration
,
1133 N_Generic_Package_Declaration
,
1134 N_Subprogram_Declaration
,
1135 N_Generic_Subprogram_Declaration
)
1138 Loc
: constant Source_Ptr
:= Sloc
(N
);
1139 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Loc
);
1142 Spec_Id
:= Defining_Entity
(Unit_Node
);
1143 Generate_Definition
(Spec_Id
);
1145 -- See if an elaboration entity is required for possible access
1146 -- before elaboration checking. Note that we must allow for this
1147 -- even if -gnatE is not set, since a client may be compiled in
1148 -- -gnatE mode and reference the entity.
1150 -- These entities are also used by the binder to prevent multiple
1151 -- attempts to execute the elaboration code for the library case
1152 -- where the elaboration routine might otherwise be called more
1155 -- Case of units which do not require elaboration checks
1158 -- Pure units do not need checks
1162 -- Preelaborated units do not need checks
1164 or else Is_Preelaborated
(Spec_Id
)
1166 -- No checks needed if pragma Elaborate_Body present
1168 or else Has_Pragma_Elaborate_Body
(Spec_Id
)
1170 -- No checks needed if unit does not require a body
1172 or else not Unit_Requires_Body
(Spec_Id
)
1174 -- No checks needed for predefined files
1176 or else Is_Predefined_File_Name
(Unit_File_Name
(Unum
))
1178 -- No checks required if no separate spec
1180 or else Acts_As_Spec
(N
)
1182 -- This is a case where we only need the entity for
1183 -- checking to prevent multiple elaboration checks.
1185 Set_Elaboration_Entity_Required
(Spec_Id
, False);
1187 -- Case of elaboration entity is required for access before
1188 -- elaboration checking (so certainly we must build it).
1191 Set_Elaboration_Entity_Required
(Spec_Id
, True);
1194 Build_Elaboration_Entity
(N
, Spec_Id
);
1198 -- Freeze the compilation unit entity. This for sure is needed because
1199 -- of some warnings that can be output (see Freeze_Subprogram), but may
1200 -- in general be required. If freezing actions result, place them in the
1201 -- compilation unit actions list, and analyze them.
1204 L
: constant List_Id
:=
1205 Freeze_Entity
(Cunit_Entity
(Current_Sem_Unit
), N
);
1207 while Is_Non_Empty_List
(L
) loop
1208 Insert_Library_Level_Action
(Remove_Head
(L
));
1214 -- Call Check_Package_Body so that a body containing subprograms with
1215 -- Inline_Always can be made available for front end inlining.
1217 if Nkind
(Unit_Node
) = N_Package_Declaration
1218 and then Get_Cunit_Unit_Number
(N
) /= Main_Unit
1220 -- We don't need to do this if the Expander is not active, since there
1221 -- is no code to inline.
1223 and then Expander_Active
1226 Save_Style_Check
: constant Boolean := Style_Check
;
1227 Save_Warning
: constant Warning_Mode_Type
:= Warning_Mode
;
1228 Options
: Style_Check_Options
;
1231 Save_Style_Check_Options
(Options
);
1232 Reset_Style_Check_Options
;
1233 Opt
.Warning_Mode
:= Suppress
;
1235 Check_Package_Body_For_Inlining
(N
, Defining_Entity
(Unit_Node
));
1237 Reset_Style_Check_Options
;
1238 Set_Style_Check_Options
(Options
);
1239 Style_Check
:= Save_Style_Check
;
1240 Warning_Mode
:= Save_Warning
;
1244 -- If we are generating obsolescent warnings, then here is where we
1245 -- generate them for the with'ed items. The reason for this special
1246 -- processing is that the normal mechanism of generating the warnings
1247 -- for referenced entities does not work for context clause references.
1248 -- That's because when we first analyze the context, it is too early to
1249 -- know if the with'ing unit is itself obsolescent (which suppresses
1253 and then Warn_On_Obsolescent_Feature
1254 and then Nkind
(Unit_Node
) not in N_Generic_Instantiation
1256 -- Push current compilation unit as scope, so that the test for
1257 -- being within an obsolescent unit will work correctly. The check
1258 -- is not performed within an instantiation, because the warning
1259 -- will have been emitted in the corresponding generic unit.
1261 Push_Scope
(Defining_Entity
(Unit_Node
));
1263 -- Loop through context items to deal with with clauses
1271 Item
:= First
(Context_Items
(N
));
1272 while Present
(Item
) loop
1273 if Nkind
(Item
) = N_With_Clause
1275 -- Suppress this check in limited-withed units. Further work
1276 -- needed here if we decide to incorporate this check on
1277 -- limited-withed units.
1279 and then not Limited_Present
(Item
)
1282 Ent
:= Entity
(Nam
);
1284 if Is_Obsolescent
(Ent
) then
1285 Output_Obsolescent_Entity_Warnings
(Nam
, Ent
);
1293 -- Remove temporary install of current unit as scope
1298 -- If No_Elaboration_Code_All was encountered, this is where we do the
1299 -- transitive test of with'ed units to make sure they have the aspect.
1300 -- This is delayed till the end of analyzing the compilation unit to
1301 -- ensure that the pragma/aspect, if present, has been analyzed.
1303 Check_No_Elab_Code_All
(N
);
1304 end Analyze_Compilation_Unit
;
1306 ---------------------
1307 -- Analyze_Context --
1308 ---------------------
1310 procedure Analyze_Context
(N
: Node_Id
) is
1311 Ukind
: constant Node_Kind
:= Nkind
(Unit
(N
));
1315 -- First process all configuration pragmas at the start of the context
1316 -- items. Strictly these are not part of the context clause, but that
1317 -- is where the parser puts them. In any case for sure we must analyze
1318 -- these before analyzing the actual context items, since they can have
1319 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1320 -- be with'ed as a result of changing categorizations in Ada 2005).
1322 Item
:= First
(Context_Items
(N
));
1323 while Present
(Item
)
1324 and then Nkind
(Item
) = N_Pragma
1325 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
1331 -- This is the point at which we capture the configuration settings
1332 -- for the unit. At the moment only the Optimize_Alignment setting
1333 -- needs to be captured. Probably more later ???
1335 if Optimize_Alignment_Local
then
1336 Set_OA_Setting
(Current_Sem_Unit
, 'L');
1338 Set_OA_Setting
(Current_Sem_Unit
, Optimize_Alignment
);
1341 -- Loop through actual context items. This is done in two passes:
1343 -- a) The first pass analyzes non-limited with-clauses and also any
1344 -- configuration pragmas (we need to get the latter analyzed right
1345 -- away, since they can affect processing of subsequent items).
1347 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1349 while Present
(Item
) loop
1351 -- For with clause, analyze the with clause, and then update the
1352 -- version, since we are dependent on a unit that we with.
1354 if Nkind
(Item
) = N_With_Clause
1355 and then not Limited_Present
(Item
)
1357 -- Skip analyzing with clause if no unit, nothing to do (this
1358 -- happens for a with that references a non-existent unit).
1360 if Present
(Library_Unit
(Item
)) then
1362 -- Skip analyzing with clause if this is a with_clause for
1363 -- the main unit, which happens if a subunit has a useless
1364 -- with_clause on its parent.
1366 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
) then
1369 -- Here for the case of a useless with for the main unit
1372 Set_Entity
(Name
(Item
), Cunit_Entity
(Current_Sem_Unit
));
1376 -- Do version update (skipped for implicit with)
1378 if not Implicit_With
(Item
) then
1379 Version_Update
(N
, Library_Unit
(Item
));
1382 -- Skip pragmas. Configuration pragmas at the start were handled in
1383 -- the loop above, and remaining pragmas are not processed until we
1384 -- actually install the context (see Install_Context). We delay the
1385 -- analysis of these pragmas to make sure that we have installed all
1386 -- the implicit with's on parent units.
1388 -- Skip use clauses at this stage, since we don't want to do any
1389 -- installing of potentially use-visible entities until we
1390 -- actually install the complete context (in Install_Context).
1391 -- Otherwise things can get installed in the wrong context.
1400 -- Second pass: examine all limited_with clauses. All other context
1401 -- items are ignored in this pass.
1403 Item
:= First
(Context_Items
(N
));
1404 while Present
(Item
) loop
1405 if Nkind
(Item
) = N_With_Clause
1406 and then Limited_Present
(Item
)
1408 -- No need to check errors on implicitly generated limited-with
1411 if not Implicit_With
(Item
) then
1413 -- Verify that the illegal contexts given in 10.1.2 (18/2) are
1414 -- properly rejected, including renaming declarations.
1416 if not Nkind_In
(Ukind
, N_Package_Declaration
,
1417 N_Subprogram_Declaration
)
1418 and then Ukind
not in N_Generic_Declaration
1419 and then Ukind
not in N_Generic_Instantiation
1421 Error_Msg_N
("limited with_clause not allowed here", Item
);
1423 -- Check wrong use of a limited with clause applied to the
1424 -- compilation unit containing the limited-with clause.
1426 -- limited with P.Q;
1427 -- package P.Q is ...
1429 elsif Unit
(Library_Unit
(Item
)) = Unit
(N
) then
1430 Error_Msg_N
("wrong use of limited-with clause", Item
);
1432 -- Check wrong use of limited-with clause applied to some
1433 -- immediate ancestor.
1435 elsif Is_Child_Spec
(Unit
(N
)) then
1437 Lib_U
: constant Entity_Id
:= Unit
(Library_Unit
(Item
));
1441 P
:= Parent_Spec
(Unit
(N
));
1443 if Unit
(P
) = Lib_U
then
1444 Error_Msg_N
("limited with_clause cannot "
1445 & "name ancestor", Item
);
1449 exit when not Is_Child_Spec
(Unit
(P
));
1450 P
:= Parent_Spec
(Unit
(P
));
1455 -- Check if the limited-withed unit is already visible through
1456 -- some context clause of the current compilation unit or some
1457 -- ancestor of the current compilation unit.
1460 Lim_Unit_Name
: constant Node_Id
:= Name
(Item
);
1461 Comp_Unit
: Node_Id
;
1463 Unit_Name
: Node_Id
;
1468 It
:= First
(Context_Items
(Comp_Unit
));
1469 while Present
(It
) loop
1471 and then Nkind
(It
) = N_With_Clause
1472 and then not Limited_Present
(It
)
1474 Nkind_In
(Unit
(Library_Unit
(It
)),
1475 N_Package_Declaration
,
1476 N_Package_Renaming_Declaration
)
1478 if Nkind
(Unit
(Library_Unit
(It
))) =
1479 N_Package_Declaration
1481 Unit_Name
:= Name
(It
);
1483 Unit_Name
:= Name
(Unit
(Library_Unit
(It
)));
1486 -- Check if the named package (or some ancestor)
1487 -- leaves visible the full-view of the unit given
1488 -- in the limited-with clause
1491 if Designate_Same_Unit
(Lim_Unit_Name
,
1494 Error_Msg_Sloc
:= Sloc
(It
);
1496 ("simultaneous visibility of limited "
1497 & "and unlimited views not allowed",
1500 ("\unlimited view visible through "
1501 & "context clause #",
1505 elsif Nkind
(Unit_Name
) = N_Identifier
then
1509 Unit_Name
:= Prefix
(Unit_Name
);
1516 exit when not Is_Child_Spec
(Unit
(Comp_Unit
));
1518 Comp_Unit
:= Parent_Spec
(Unit
(Comp_Unit
));
1523 -- Skip analyzing with clause if no unit, see above
1525 if Present
(Library_Unit
(Item
)) then
1529 -- A limited_with does not impose an elaboration order, but
1530 -- there is a semantic dependency for recompilation purposes.
1532 if not Implicit_With
(Item
) then
1533 Version_Update
(N
, Library_Unit
(Item
));
1536 -- Pragmas and use clauses and with clauses other than limited
1537 -- with's are ignored in this pass through the context items.
1545 end Analyze_Context
;
1547 -------------------------------
1548 -- Analyze_Package_Body_Stub --
1549 -------------------------------
1551 procedure Analyze_Package_Body_Stub
(N
: Node_Id
) is
1552 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1554 Opts
: Config_Switches_Type
;
1557 -- The package declaration must be in the current declarative part
1559 Check_Stub_Level
(N
);
1560 Nam
:= Current_Entity_In_Scope
(Id
);
1562 if No
(Nam
) or else not Is_Package_Or_Generic_Package
(Nam
) then
1563 Error_Msg_N
("missing specification for package stub", N
);
1565 elsif Has_Completion
(Nam
)
1566 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(Nam
)))
1568 Error_Msg_N
("duplicate or redundant stub for package", N
);
1571 -- Retain and restore the configuration options of the enclosing
1572 -- context as the proper body may introduce a set of its own.
1574 Save_Opt_Config_Switches
(Opts
);
1576 -- Indicate that the body of the package exists. If we are doing
1577 -- only semantic analysis, the stub stands for the body. If we are
1578 -- generating code, the existence of the body will be confirmed
1579 -- when we load the proper body.
1581 Set_Has_Completion
(Nam
);
1582 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1583 Set_Corresponding_Spec_Of_Stub
(N
, Nam
);
1584 Generate_Reference
(Nam
, Id
, 'b');
1585 Analyze_Proper_Body
(N
, Nam
);
1587 Restore_Opt_Config_Switches
(Opts
);
1589 end Analyze_Package_Body_Stub
;
1591 -------------------------
1592 -- Analyze_Proper_Body --
1593 -------------------------
1595 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
) is
1596 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
1598 procedure Optional_Subunit
;
1599 -- This procedure is called when the main unit is a stub, or when we
1600 -- are not generating code. In such a case, we analyze the subunit if
1601 -- present, which is user-friendly and in fact required for ASIS, but we
1602 -- don't complain if the subunit is missing. In GNATprove_Mode, we issue
1603 -- an error to avoid formal verification of a partial unit.
1605 ----------------------
1606 -- Optional_Subunit --
1607 ----------------------
1609 procedure Optional_Subunit
is
1610 Comp_Unit
: Node_Id
;
1611 Unum
: Unit_Number_Type
;
1614 -- Try to load subunit, but ignore any errors that occur during the
1615 -- loading of the subunit, by using the special feature in Errout to
1616 -- ignore all errors. Note that Fatal_Error will still be set, so we
1617 -- will be able to check for this case below.
1619 if not (ASIS_Mode
or GNATprove_Mode
) then
1620 Ignore_Errors_Enable
:= Ignore_Errors_Enable
+ 1;
1625 (Load_Name
=> Subunit_Name
,
1626 Required
=> GNATprove_Mode
,
1630 if not (ASIS_Mode
or GNATprove_Mode
) then
1631 Ignore_Errors_Enable
:= Ignore_Errors_Enable
- 1;
1634 -- All done if we successfully loaded the subunit
1637 and then (Fatal_Error
(Unum
) /= Error_Detected
1638 or else Try_Semantics
)
1640 Comp_Unit
:= Cunit
(Unum
);
1642 -- If the file was empty or seriously mangled, the unit itself may
1645 if No
(Unit
(Comp_Unit
)) then
1647 ("subunit does not contain expected proper body", N
);
1649 elsif Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1651 ("expected SEPARATE subunit, found child unit",
1652 Cunit_Entity
(Unum
));
1654 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1655 Analyze_Subunit
(Comp_Unit
);
1656 Set_Library_Unit
(N
, Comp_Unit
);
1657 Set_Corresponding_Body
(N
, Defining_Entity
(Unit
(Comp_Unit
)));
1660 elsif Unum
= No_Unit
1661 and then Present
(Nam
)
1663 if Is_Protected_Type
(Nam
) then
1664 Set_Corresponding_Body
(Parent
(Nam
), Defining_Identifier
(N
));
1666 Set_Corresponding_Body
(
1667 Unit_Declaration_Node
(Nam
), Defining_Identifier
(N
));
1670 end Optional_Subunit
;
1674 Comp_Unit
: Node_Id
;
1675 Unum
: Unit_Number_Type
;
1677 -- Start of processing for Analyze_Proper_Body
1680 -- If the subunit is already loaded, it means that the main unit is a
1681 -- subunit, and that the current unit is one of its parents which was
1682 -- being analyzed to provide the needed context for the analysis of the
1683 -- subunit. In this case we analyze the subunit and continue with the
1684 -- parent, without looking at subsequent subunits.
1686 if Is_Loaded
(Subunit_Name
) then
1688 -- If the proper body is already linked to the stub node, the stub is
1689 -- in a generic unit and just needs analyzing.
1691 if Present
(Library_Unit
(N
)) then
1692 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1694 -- If the subunit has severe errors, the spec of the enclosing
1695 -- body may not be available, in which case do not try analysis.
1697 if Serious_Errors_Detected
> 0
1698 and then No
(Library_Unit
(Library_Unit
(N
)))
1703 Analyze_Subunit
(Library_Unit
(N
));
1705 -- Otherwise we must load the subunit and link to it
1708 -- Load the subunit, this must work, since we originally loaded
1709 -- the subunit earlier on. So this will not really load it, just
1710 -- give access to it.
1714 (Load_Name
=> Subunit_Name
,
1719 -- And analyze the subunit in the parent context (note that we
1720 -- do not call Semantics, since that would remove the parent
1721 -- context). Because of this, we have to manually reset the
1722 -- compiler state to Analyzing since it got destroyed by Load.
1724 if Unum
/= No_Unit
then
1725 Compiler_State
:= Analyzing
;
1727 -- Check that the proper body is a subunit and not a child
1728 -- unit. If the unit was previously loaded, the error will
1729 -- have been emitted when copying the generic node, so we
1730 -- just return to avoid cascaded errors.
1732 if Nkind
(Unit
(Cunit
(Unum
))) /= N_Subunit
then
1736 Set_Corresponding_Stub
(Unit
(Cunit
(Unum
)), N
);
1737 Analyze_Subunit
(Cunit
(Unum
));
1738 Set_Library_Unit
(N
, Cunit
(Unum
));
1742 -- If the main unit is a subunit, then we are just performing semantic
1743 -- analysis on that subunit, and any other subunits of any parent unit
1744 -- should be ignored, except that if we are building trees for ASIS
1745 -- usage we want to annotate the stub properly. If the main unit is
1746 -- itself a subunit, another subunit is irrelevant unless it is a
1747 -- subunit of the current one, that is to say appears in the current
1750 elsif Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
1751 and then Subunit_Name
/= Unit_Name
(Main_Unit
)
1755 PB
: constant Node_Id
:= Proper_Body
(Unit
(Cunit
(Main_Unit
)));
1757 if Nkind_In
(PB
, N_Package_Body
, N_Subprogram_Body
)
1758 and then List_Containing
(N
) = Declarations
(PB
)
1765 -- But before we return, set the flag for unloaded subunits. This
1766 -- will suppress junk warnings of variables in the same declarative
1767 -- part (or a higher level one) that are in danger of looking unused
1768 -- when in fact there might be a declaration in the subunit that we
1769 -- do not intend to load.
1771 Unloaded_Subunits
:= True;
1774 -- If the subunit is not already loaded, and we are generating code,
1775 -- then this is the case where compilation started from the parent, and
1776 -- we are generating code for an entire subunit tree. In that case we
1777 -- definitely need to load the subunit.
1779 -- In order to continue the analysis with the rest of the parent,
1780 -- and other subunits, we load the unit without requiring its
1781 -- presence, and emit a warning if not found, rather than terminating
1782 -- the compilation abruptly, as for other missing file problems.
1784 elsif Original_Operating_Mode
= Generate_Code
then
1786 -- If the proper body is already linked to the stub node, the stub is
1787 -- in a generic unit and just needs analyzing.
1789 -- We update the version. Although we are not strictly technically
1790 -- semantically dependent on the subunit, given our approach of macro
1791 -- substitution of subunits, it makes sense to include it in the
1792 -- version identification.
1794 if Present
(Library_Unit
(N
)) then
1795 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1796 Analyze_Subunit
(Library_Unit
(N
));
1797 Version_Update
(Cunit
(Main_Unit
), Library_Unit
(N
));
1799 -- Otherwise we must load the subunit and link to it
1802 -- Make sure that, if the subunit is preprocessed and -gnateG is
1803 -- specified, the preprocessed file will be written.
1805 Lib
.Analysing_Subunit_Of_Main
:= True;
1808 (Load_Name
=> Subunit_Name
,
1812 Lib
.Analysing_Subunit_Of_Main
:= False;
1814 -- Give message if we did not get the unit Emit warning even if
1815 -- missing subunit is not within main unit, to simplify debugging.
1817 if Original_Operating_Mode
= Generate_Code
1818 and then Unum
= No_Unit
1820 Error_Msg_Unit_1
:= Subunit_Name
;
1822 Get_File_Name
(Subunit_Name
, Subunit
=> True);
1824 ("subunit$$ in file{ not found??!!", N
);
1825 Subunits_Missing
:= True;
1828 -- Load_Unit may reset Compiler_State, since it may have been
1829 -- necessary to parse an additional units, so we make sure that
1830 -- we reset it to the Analyzing state.
1832 Compiler_State
:= Analyzing
;
1834 if Unum
/= No_Unit
then
1835 if Debug_Flag_L
then
1836 Write_Str
("*** Loaded subunit from stub. Analyze");
1840 Comp_Unit
:= Cunit
(Unum
);
1842 -- Check for child unit instead of subunit
1844 if Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1846 ("expected SEPARATE subunit, found child unit",
1847 Cunit_Entity
(Unum
));
1849 -- OK, we have a subunit
1852 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1853 Set_Library_Unit
(N
, Comp_Unit
);
1855 -- We update the version. Although we are not technically
1856 -- semantically dependent on the subunit, given our approach
1857 -- of macro substitution of subunits, it makes sense to
1858 -- include it in the version identification.
1860 Version_Update
(Cunit
(Main_Unit
), Comp_Unit
);
1862 -- Collect SCO information for loaded subunit if we are in
1867 In_Extended_Main_Source_Unit
1868 (Cunit_Entity
(Current_Sem_Unit
))
1870 SCO_Record_Raw
(Unum
);
1873 -- Analyze the unit if semantics active
1875 if Fatal_Error
(Unum
) /= Error_Detected
1876 or else Try_Semantics
1878 Analyze_Subunit
(Comp_Unit
);
1884 -- The remaining case is when the subunit is not already loaded and we
1885 -- are not generating code. In this case we are just performing semantic
1886 -- analysis on the parent, and we are not interested in the subunit. For
1887 -- subprograms, analyze the stub as a body. For other entities the stub
1888 -- has already been marked as completed.
1893 end Analyze_Proper_Body
;
1895 ----------------------------------
1896 -- Analyze_Protected_Body_Stub --
1897 ----------------------------------
1899 procedure Analyze_Protected_Body_Stub
(N
: Node_Id
) is
1900 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
1903 Check_Stub_Level
(N
);
1905 -- First occurrence of name may have been as an incomplete type
1907 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
1908 Nam
:= Full_View
(Nam
);
1911 if No
(Nam
) or else not Is_Protected_Type
(Etype
(Nam
)) then
1912 Error_Msg_N
("missing specification for Protected body", N
);
1915 -- Currently there are no language-defined aspects that can apply to
1916 -- a protected body stub. Issue an error and remove the aspects to
1917 -- prevent cascaded errors.
1919 if Has_Aspects
(N
) then
1921 ("aspects on protected bodies are not allowed",
1922 First
(Aspect_Specifications
(N
)));
1926 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1927 Set_Has_Completion
(Etype
(Nam
));
1928 Set_Corresponding_Spec_Of_Stub
(N
, Nam
);
1929 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
1930 Analyze_Proper_Body
(N
, Etype
(Nam
));
1932 end Analyze_Protected_Body_Stub
;
1934 ----------------------------------
1935 -- Analyze_Subprogram_Body_Stub --
1936 ----------------------------------
1938 -- A subprogram body stub can appear with or without a previous spec. If
1939 -- there is one, then the analysis of the body will find it and verify
1940 -- conformance. The formals appearing in the specification of the stub play
1941 -- no role, except for requiring an additional conformance check. If there
1942 -- is no previous subprogram declaration, the stub acts as a spec, and
1943 -- provides the defining entity for the subprogram.
1945 procedure Analyze_Subprogram_Body_Stub
(N
: Node_Id
) is
1947 Opts
: Config_Switches_Type
;
1950 Check_Stub_Level
(N
);
1952 -- Verify that the identifier for the stub is unique within this
1953 -- declarative part.
1955 if Nkind_In
(Parent
(N
), N_Block_Statement
,
1959 Decl
:= First
(Declarations
(Parent
(N
)));
1960 while Present
(Decl
) and then Decl
/= N
loop
1961 if Nkind
(Decl
) = N_Subprogram_Body_Stub
1962 and then (Chars
(Defining_Unit_Name
(Specification
(Decl
))) =
1963 Chars
(Defining_Unit_Name
(Specification
(N
))))
1965 Error_Msg_N
("identifier for stub is not unique", N
);
1972 -- Retain and restore the configuration options of the enclosing context
1973 -- as the proper body may introduce a set of its own.
1975 Save_Opt_Config_Switches
(Opts
);
1977 -- Treat stub as a body, which checks conformance if there is a previous
1978 -- declaration, or else introduces entity and its signature.
1980 Analyze_Subprogram_Body
(N
);
1981 Analyze_Proper_Body
(N
, Empty
);
1983 Restore_Opt_Config_Switches
(Opts
);
1984 end Analyze_Subprogram_Body_Stub
;
1986 -------------------------------------------
1987 -- Analyze_Subprogram_Body_Stub_Contract --
1988 -------------------------------------------
1990 procedure Analyze_Subprogram_Body_Stub_Contract
(Stub_Id
: Entity_Id
) is
1991 Stub_Decl
: constant Node_Id
:= Parent
(Parent
(Stub_Id
));
1992 Spec_Id
: constant Entity_Id
:= Corresponding_Spec_Of_Stub
(Stub_Decl
);
1995 -- A subprogram body stub may act as its own spec or as the completion
1996 -- of a previous declaration. Depending on the context, the contract of
1997 -- the stub may contain two sets of pragmas.
1999 -- The stub is a completion, the applicable pragmas are:
2003 if Present
(Spec_Id
) then
2004 Analyze_Subprogram_Body_Contract
(Stub_Id
);
2006 -- The stub acts as its own spec, the applicable pragmas are:
2015 Analyze_Subprogram_Contract
(Stub_Id
);
2017 end Analyze_Subprogram_Body_Stub_Contract
;
2019 ---------------------
2020 -- Analyze_Subunit --
2021 ---------------------
2023 -- A subunit is compiled either by itself (for semantic checking) or as
2024 -- part of compiling the parent (for code generation). In either case, by
2025 -- the time we actually process the subunit, the parent has already been
2026 -- installed and analyzed. The node N is a compilation unit, whose context
2027 -- needs to be treated here, because we come directly here from the parent
2028 -- without calling Analyze_Compilation_Unit.
2030 -- The compilation context includes the explicit context of the subunit,
2031 -- and the context of the parent, together with the parent itself. In order
2032 -- to compile the current context, we remove the one inherited from the
2033 -- parent, in order to have a clean visibility table. We restore the parent
2034 -- context before analyzing the proper body itself. On exit, we remove only
2035 -- the explicit context of the subunit.
2037 procedure Analyze_Subunit
(N
: Node_Id
) is
2038 Lib_Unit
: constant Node_Id
:= Library_Unit
(N
);
2039 Par_Unit
: constant Entity_Id
:= Current_Scope
;
2041 Lib_Spec
: Node_Id
:= Library_Unit
(Lib_Unit
);
2042 Num_Scopes
: Int
:= 0;
2043 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
2044 Enclosing_Child
: Entity_Id
:= Empty
;
2045 Svg
: constant Suppress_Record
:= Scope_Suppress
;
2047 Save_Cunit_Restrictions
: constant Save_Cunit_Boolean_Restrictions
:=
2048 Cunit_Boolean_Restrictions_Save
;
2049 -- Save non-partition wide restrictions before processing the subunit.
2050 -- All subunits are analyzed with config restrictions reset and we need
2051 -- to restore these saved values at the end.
2053 procedure Analyze_Subunit_Context
;
2054 -- Capture names in use clauses of the subunit. This must be done before
2055 -- re-installing parent declarations, because items in the context must
2056 -- not be hidden by declarations local to the parent.
2058 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
);
2059 -- Recursive procedure to restore scope of all ancestors of subunit,
2060 -- from outermost in. If parent is not a subunit, the call to install
2061 -- context installs context of spec and (if parent is a child unit) the
2062 -- context of its parents as well. It is confusing that parents should
2063 -- be treated differently in both cases, but the semantics are just not
2066 procedure Re_Install_Use_Clauses
;
2067 -- As part of the removal of the parent scope, the use clauses are
2068 -- removed, to be reinstalled when the context of the subunit has been
2069 -- analyzed. Use clauses may also have been affected by the analysis of
2070 -- the context of the subunit, so they have to be applied again, to
2071 -- insure that the compilation environment of the rest of the parent
2072 -- unit is identical.
2074 procedure Remove_Scope
;
2075 -- Remove current scope from scope stack, and preserve the list of use
2076 -- clauses in it, to be reinstalled after context is analyzed.
2078 -----------------------------
2079 -- Analyze_Subunit_Context --
2080 -----------------------------
2082 procedure Analyze_Subunit_Context
is
2085 Unit_Name
: Entity_Id
;
2088 Analyze_Context
(N
);
2089 Check_No_Elab_Code_All
(N
);
2091 -- Make withed units immediately visible. If child unit, make the
2092 -- ultimate parent immediately visible.
2094 Item
:= First
(Context_Items
(N
));
2095 while Present
(Item
) loop
2096 if Nkind
(Item
) = N_With_Clause
then
2098 -- Protect frontend against previous errors in context clauses
2100 if Nkind
(Name
(Item
)) /= N_Selected_Component
then
2101 if Error_Posted
(Item
) then
2105 -- If a subunits has serious syntax errors, the context
2106 -- may not have been loaded. Add a harmless unit name to
2107 -- attempt processing.
2109 if Serious_Errors_Detected
> 0
2110 and then No
(Entity
(Name
(Item
)))
2112 Set_Entity
(Name
(Item
), Standard_Standard
);
2115 Unit_Name
:= Entity
(Name
(Item
));
2117 Set_Is_Visible_Lib_Unit
(Unit_Name
);
2118 exit when Scope
(Unit_Name
) = Standard_Standard
;
2119 Unit_Name
:= Scope
(Unit_Name
);
2121 if No
(Unit_Name
) then
2122 Check_Error_Detected
;
2127 if not Is_Immediately_Visible
(Unit_Name
) then
2128 Set_Is_Immediately_Visible
(Unit_Name
);
2129 Set_Context_Installed
(Item
);
2134 elsif Nkind
(Item
) = N_Use_Package_Clause
then
2135 Nam
:= First
(Names
(Item
));
2136 while Present
(Nam
) loop
2141 elsif Nkind
(Item
) = N_Use_Type_Clause
then
2142 Nam
:= First
(Subtype_Marks
(Item
));
2143 while Present
(Nam
) loop
2152 -- Reset visibility of withed units. They will be made visible again
2153 -- when we install the subunit context.
2155 Item
:= First
(Context_Items
(N
));
2156 while Present
(Item
) loop
2157 if Nkind
(Item
) = N_With_Clause
2159 -- Protect frontend against previous errors in context clauses
2161 and then Nkind
(Name
(Item
)) /= N_Selected_Component
2162 and then not Error_Posted
(Item
)
2164 Unit_Name
:= Entity
(Name
(Item
));
2166 Set_Is_Visible_Lib_Unit
(Unit_Name
, False);
2167 exit when Scope
(Unit_Name
) = Standard_Standard
;
2168 Unit_Name
:= Scope
(Unit_Name
);
2171 if Context_Installed
(Item
) then
2172 Set_Is_Immediately_Visible
(Unit_Name
, False);
2173 Set_Context_Installed
(Item
, False);
2179 end Analyze_Subunit_Context
;
2181 ------------------------
2182 -- Re_Install_Parents --
2183 ------------------------
2185 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
) is
2189 if Nkind
(Unit
(L
)) = N_Subunit
then
2190 Re_Install_Parents
(Library_Unit
(L
), Scope
(Scop
));
2193 Install_Context
(L
);
2195 -- If the subunit occurs within a child unit, we must restore the
2196 -- immediate visibility of any siblings that may occur in context.
2198 if Present
(Enclosing_Child
) then
2199 Install_Siblings
(Enclosing_Child
, L
);
2204 if Scop
/= Par_Unit
then
2205 Set_Is_Immediately_Visible
(Scop
);
2208 -- Make entities in scope visible again. For child units, restore
2209 -- visibility only if they are actually in context.
2211 E
:= First_Entity
(Current_Scope
);
2212 while Present
(E
) loop
2213 if not Is_Child_Unit
(E
) or else Is_Visible_Lib_Unit
(E
) then
2214 Set_Is_Immediately_Visible
(E
);
2220 -- A subunit appears within a body, and for a nested subunits all the
2221 -- parents are bodies. Restore full visibility of their private
2224 if Is_Package_Or_Generic_Package
(Scop
) then
2225 Set_In_Package_Body
(Scop
);
2226 Install_Private_Declarations
(Scop
);
2228 end Re_Install_Parents
;
2230 ----------------------------
2231 -- Re_Install_Use_Clauses --
2232 ----------------------------
2234 procedure Re_Install_Use_Clauses
is
2237 for J
in reverse 1 .. Num_Scopes
loop
2238 U
:= Use_Clauses
(J
);
2239 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:= U
;
2240 Install_Use_Clauses
(U
, Force_Installation
=> True);
2242 end Re_Install_Use_Clauses
;
2248 procedure Remove_Scope
is
2252 Num_Scopes
:= Num_Scopes
+ 1;
2253 Use_Clauses
(Num_Scopes
) :=
2254 Scope_Stack
.Table
(Scope_Stack
.Last
).First_Use_Clause
;
2256 E
:= First_Entity
(Current_Scope
);
2257 while Present
(E
) loop
2258 Set_Is_Immediately_Visible
(E
, False);
2262 if Is_Child_Unit
(Current_Scope
) then
2263 Enclosing_Child
:= Current_Scope
;
2269 -- Start of processing for Analyze_Subunit
2272 -- For subunit in main extended unit, we reset the configuration values
2273 -- for the non-partition-wide restrictions. For other units reset them.
2275 if In_Extended_Main_Source_Unit
(N
) then
2276 Restore_Config_Cunit_Boolean_Restrictions
;
2278 Reset_Cunit_Boolean_Restrictions
;
2283 Nam
: Node_Id
:= Name
(Unit
(N
));
2286 if Nkind
(Nam
) = N_Selected_Component
then
2287 Nam
:= Selector_Name
(Nam
);
2290 Check_Identifier
(Nam
, Par_Unit
);
2294 if not Is_Empty_List
(Context_Items
(N
)) then
2296 -- Save current use clauses
2299 Remove_Context
(Lib_Unit
);
2301 -- Now remove parents and their context, including enclosing subunits
2302 -- and the outer parent body which is not a subunit.
2304 if Present
(Lib_Spec
) then
2305 Remove_Context
(Lib_Spec
);
2307 while Nkind
(Unit
(Lib_Spec
)) = N_Subunit
loop
2308 Lib_Spec
:= Library_Unit
(Lib_Spec
);
2310 Remove_Context
(Lib_Spec
);
2313 if Nkind
(Unit
(Lib_Unit
)) = N_Subunit
then
2317 if Nkind
(Unit
(Lib_Spec
)) = N_Package_Body
then
2318 Remove_Context
(Library_Unit
(Lib_Spec
));
2322 Set_Is_Immediately_Visible
(Par_Unit
, False);
2324 Analyze_Subunit_Context
;
2326 Re_Install_Parents
(Lib_Unit
, Par_Unit
);
2327 Set_Is_Immediately_Visible
(Par_Unit
);
2329 -- If the context includes a child unit of the parent of the subunit,
2330 -- the parent will have been removed from visibility, after compiling
2331 -- that cousin in the context. The visibility of the parent must be
2332 -- restored now. This also applies if the context includes another
2333 -- subunit of the same parent which in turn includes a child unit in
2336 if Is_Package_Or_Generic_Package
(Par_Unit
) then
2337 if not Is_Immediately_Visible
(Par_Unit
)
2338 or else (Present
(First_Entity
(Par_Unit
))
2340 Is_Immediately_Visible
(First_Entity
(Par_Unit
)))
2342 Set_Is_Immediately_Visible
(Par_Unit
);
2343 Install_Visible_Declarations
(Par_Unit
);
2344 Install_Private_Declarations
(Par_Unit
);
2348 Re_Install_Use_Clauses
;
2349 Install_Context
(N
);
2351 -- Restore state of suppress flags for current body
2353 Scope_Suppress
:= Svg
;
2355 -- If the subunit is within a child unit, then siblings of any parent
2356 -- unit that appear in the context clause of the subunit must also be
2357 -- made immediately visible.
2359 if Present
(Enclosing_Child
) then
2360 Install_Siblings
(Enclosing_Child
, N
);
2364 Generate_Parent_References
(Unit
(N
), Par_Unit
);
2365 Analyze
(Proper_Body
(Unit
(N
)));
2368 -- The subunit may contain a with_clause on a sibling of some ancestor.
2369 -- Removing the context will remove from visibility those ancestor child
2370 -- units, which must be restored to the visibility they have in the
2373 if Present
(Enclosing_Child
) then
2378 while Present
(C
) and then C
/= Standard_Standard
loop
2379 Set_Is_Immediately_Visible
(C
);
2380 Set_Is_Visible_Lib_Unit
(C
);
2386 -- Deal with restore of restrictions
2388 Cunit_Boolean_Restrictions_Restore
(Save_Cunit_Restrictions
);
2389 end Analyze_Subunit
;
2391 ----------------------------
2392 -- Analyze_Task_Body_Stub --
2393 ----------------------------
2395 procedure Analyze_Task_Body_Stub
(N
: Node_Id
) is
2396 Loc
: constant Source_Ptr
:= Sloc
(N
);
2397 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
2400 Check_Stub_Level
(N
);
2402 -- First occurrence of name may have been as an incomplete type
2404 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
2405 Nam
:= Full_View
(Nam
);
2408 if No
(Nam
) or else not Is_Task_Type
(Etype
(Nam
)) then
2409 Error_Msg_N
("missing specification for task body", N
);
2412 -- Currently there are no language-defined aspects that can apply to
2413 -- a task body stub. Issue an error and remove the aspects to prevent
2416 if Has_Aspects
(N
) then
2418 ("aspects on task bodies are not allowed",
2419 First
(Aspect_Specifications
(N
)));
2423 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
2424 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
2425 Set_Corresponding_Spec_Of_Stub
(N
, Nam
);
2427 -- Check for duplicate stub, if so give message and terminate
2429 if Has_Completion
(Etype
(Nam
)) then
2430 Error_Msg_N
("duplicate stub for task", N
);
2433 Set_Has_Completion
(Etype
(Nam
));
2436 Analyze_Proper_Body
(N
, Etype
(Nam
));
2438 -- Set elaboration flag to indicate that entity is callable. This
2439 -- cannot be done in the expansion of the body itself, because the
2440 -- proper body is not in a declarative part. This is only done if
2441 -- expansion is active, because the context may be generic and the
2442 -- flag not defined yet.
2444 if Expander_Active
then
2446 Make_Assignment_Statement
(Loc
,
2448 Make_Identifier
(Loc
,
2449 Chars
=> New_External_Name
(Chars
(Etype
(Nam
)), 'E')),
2450 Expression
=> New_Occurrence_Of
(Standard_True
, Loc
)));
2453 end Analyze_Task_Body_Stub
;
2455 -------------------------
2456 -- Analyze_With_Clause --
2457 -------------------------
2459 -- Analyze the declaration of a unit in a with clause. At end, label the
2460 -- with clause with the defining entity for the unit.
2462 procedure Analyze_With_Clause
(N
: Node_Id
) is
2464 -- Retrieve the original kind of the unit node, before analysis. If it
2465 -- is a subprogram instantiation, its analysis below will rewrite the
2466 -- node as the declaration of the wrapper package. If the same
2467 -- instantiation appears indirectly elsewhere in the context, it will
2468 -- have been analyzed already.
2470 Unit_Kind
: constant Node_Kind
:=
2471 Nkind
(Original_Node
(Unit
(Library_Unit
(N
))));
2472 Nam
: constant Node_Id
:= Name
(N
);
2474 Par_Name
: Entity_Id
;
2479 -- Set True if the unit currently being compiled is an internal unit
2481 Restriction_Violation
: Boolean := False;
2482 -- Set True if a with violates a restriction, no point in giving any
2483 -- warnings if we have this definite error.
2485 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
2488 U
:= Unit
(Library_Unit
(N
));
2490 -- If this is an internal unit which is a renaming, then this is a
2491 -- violation of No_Obsolescent_Features.
2493 -- Note: this is not quite right if the user defines one of these units
2494 -- himself, but that's a marginal case, and fixing it is hard ???
2496 if Restriction_Check_Required
(No_Obsolescent_Features
) then
2498 F
: constant File_Name_Type
:=
2499 Unit_File_Name
(Get_Source_Unit
(U
));
2501 if Is_Predefined_File_Name
(F
, Renamings_Included
=> True)
2503 Is_Predefined_File_Name
(F
, Renamings_Included
=> False)
2505 Check_Restriction
(No_Obsolescent_Features
, N
);
2506 Restriction_Violation
:= True;
2511 -- Check No_Implementation_Units violation
2513 if Restriction_Check_Required
(No_Implementation_Units
) then
2514 if Not_Impl_Defined_Unit
(Get_Source_Unit
(U
)) then
2517 Check_Restriction
(No_Implementation_Units
, Nam
);
2518 Restriction_Violation
:= True;
2522 -- Several actions are skipped for dummy packages (those supplied for
2523 -- with's where no matching file could be found). Such packages are
2524 -- identified by the Sloc value being set to No_Location.
2526 if Limited_Present
(N
) then
2528 -- Ada 2005 (AI-50217): Build visibility structures but do not
2529 -- analyze the unit.
2531 if Sloc
(U
) /= No_Location
then
2532 Build_Limited_Views
(N
);
2538 -- If we are compiling under "don't quit" mode (-gnatq) and we have
2539 -- already detected serious errors then we mark the with-clause nodes as
2540 -- analyzed before the corresponding compilation unit is analyzed. This
2541 -- is done here to protect the frontend against never ending recursion
2542 -- caused by circularities in the sources (because the previous errors
2543 -- may break the regular machine of the compiler implemented in
2544 -- Load_Unit to detect circularities).
2546 if Serious_Errors_Detected
> 0 and then Try_Semantics
then
2550 -- If the library unit is a predefined unit, and we are in high
2551 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2552 -- for the analysis of the with'ed unit. This mode does not prevent
2553 -- explicit with'ing of run-time units.
2555 if Configurable_Run_Time_Mode
2556 and then Is_Predefined_File_Name
(Unit_File_Name
(Get_Source_Unit
(U
)))
2558 Configurable_Run_Time_Mode
:= False;
2559 Semantics
(Library_Unit
(N
));
2560 Configurable_Run_Time_Mode
:= True;
2563 Semantics
(Library_Unit
(N
));
2566 Intunit
:= Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
));
2568 if Sloc
(U
) /= No_Location
then
2570 -- Check restrictions, except that we skip the check if this is an
2571 -- internal unit unless we are compiling the internal unit as the
2572 -- main unit. We also skip this for dummy packages.
2574 Check_Restriction_No_Dependence
(Nam
, N
);
2576 if not Intunit
or else Current_Sem_Unit
= Main_Unit
then
2577 Check_Restricted_Unit
(Unit_Name
(Get_Source_Unit
(U
)), N
);
2580 -- Deal with special case of GNAT.Current_Exceptions which interacts
2581 -- with the optimization of local raise statements into gotos.
2583 if Nkind
(Nam
) = N_Selected_Component
2584 and then Nkind
(Prefix
(Nam
)) = N_Identifier
2585 and then Chars
(Prefix
(Nam
)) = Name_Gnat
2586 and then Nam_In
(Chars
(Selector_Name
(Nam
)),
2587 Name_Most_Recent_Exception
,
2588 Name_Exception_Traces
)
2590 Check_Restriction
(No_Exception_Propagation
, N
);
2591 Special_Exception_Package_Used
:= True;
2594 -- Check for inappropriate with of internal implementation unit if we
2595 -- are not compiling an internal unit and also check for withing unit
2596 -- in wrong version of Ada. Do not issue these messages for implicit
2597 -- with's generated by the compiler itself.
2599 if Implementation_Unit_Warnings
2600 and then not Intunit
2601 and then not Implicit_With
(N
)
2602 and then not Restriction_Violation
2605 U_Kind
: constant Kind_Of_Unit
:=
2606 Get_Kind_Of_Unit
(Get_Source_Unit
(U
));
2609 if U_Kind
= Implementation_Unit
then
2610 Error_Msg_F
("& is an internal 'G'N'A'T unit?i?", Name
(N
));
2612 -- Add alternative name if available, otherwise issue a
2613 -- general warning message.
2615 if Error_Msg_Strlen
/= 0 then
2616 Error_Msg_F
("\use ""~"" instead?i?", Name
(N
));
2619 ("\use of this unit is non-portable " &
2620 "and version-dependent?i?", Name
(N
));
2623 elsif U_Kind
= Ada_2005_Unit
2624 and then Ada_Version
< Ada_2005
2625 and then Warn_On_Ada_2005_Compatibility
2627 Error_Msg_N
("& is an Ada 2005 unit?i?", Name
(N
));
2629 elsif U_Kind
= Ada_2012_Unit
2630 and then Ada_Version
< Ada_2012
2631 and then Warn_On_Ada_2012_Compatibility
2633 Error_Msg_N
("& is an Ada 2012 unit?i?", Name
(N
));
2639 -- Semantic analysis of a generic unit is performed on a copy of
2640 -- the original tree. Retrieve the entity on which semantic info
2641 -- actually appears.
2643 if Unit_Kind
in N_Generic_Declaration
then
2644 E_Name
:= Defining_Entity
(U
);
2646 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2647 -- the case of an instantiation, semantic analysis above will have
2648 -- replaced the unit by its instantiated version. If the instance body
2649 -- has been generated, the instance now denotes the body entity. For
2650 -- visibility purposes we need the entity of its spec.
2652 elsif (Unit_Kind
= N_Package_Instantiation
2653 or else Nkind
(Original_Node
(Unit
(Library_Unit
(N
)))) =
2654 N_Package_Instantiation
)
2655 and then Nkind
(U
) = N_Package_Body
2657 E_Name
:= Corresponding_Spec
(U
);
2659 elsif Unit_Kind
= N_Package_Instantiation
2660 and then Nkind
(U
) = N_Package_Instantiation
2661 and then Present
(Instance_Spec
(U
))
2663 -- If the instance has not been rewritten as a package declaration,
2664 -- then it appeared already in a previous with clause. Retrieve
2665 -- the entity from the previous instance.
2667 E_Name
:= Defining_Entity
(Specification
(Instance_Spec
(U
)));
2669 elsif Unit_Kind
in N_Subprogram_Instantiation
then
2671 -- The visible subprogram is created during instantiation, and is
2672 -- an attribute of the wrapper package. We retrieve the wrapper
2673 -- package directly from the instantiation node. If the instance
2674 -- is inlined the unit is still an instantiation. Otherwise it has
2675 -- been rewritten as the declaration of the wrapper itself.
2677 if Nkind
(U
) in N_Subprogram_Instantiation
then
2680 (Defining_Entity
(Specification
(Instance_Spec
(U
))));
2682 E_Name
:= Related_Instance
(Defining_Entity
(U
));
2685 elsif Unit_Kind
= N_Package_Renaming_Declaration
2686 or else Unit_Kind
in N_Generic_Renaming_Declaration
2688 E_Name
:= Defining_Entity
(U
);
2690 elsif Unit_Kind
= N_Subprogram_Body
2691 and then Nkind
(Name
(N
)) = N_Selected_Component
2692 and then not Acts_As_Spec
(Library_Unit
(N
))
2694 -- For a child unit that has no spec, one has been created and
2695 -- analyzed. The entity required is that of the spec.
2697 E_Name
:= Corresponding_Spec
(U
);
2700 E_Name
:= Defining_Entity
(U
);
2703 if Nkind
(Name
(N
)) = N_Selected_Component
then
2705 -- Child unit in a with clause
2707 Change_Selected_Component_To_Expanded_Name
(Name
(N
));
2709 -- If this is a child unit without a spec, and it has been analyzed
2710 -- already, a declaration has been created for it. The with_clause
2711 -- must reflect the actual body, and not the generated declaration,
2712 -- to prevent spurious binding errors involving an out-of-date spec.
2713 -- Note that this can only happen if the unit includes more than one
2714 -- with_clause for the child unit (e.g. in separate subunits).
2716 if Unit_Kind
= N_Subprogram_Declaration
2717 and then Analyzed
(Library_Unit
(N
))
2718 and then not Comes_From_Source
(Library_Unit
(N
))
2720 Set_Library_Unit
(N
,
2721 Cunit
(Get_Source_Unit
(Corresponding_Body
(U
))));
2725 -- Restore style checks
2727 Style_Check
:= Save_Style_Check
;
2729 -- Record the reference, but do NOT set the unit as referenced, we want
2730 -- to consider the unit as unreferenced if this is the only reference
2733 Set_Entity_With_Checks
(Name
(N
), E_Name
);
2734 Generate_Reference
(E_Name
, Name
(N
), 'w', Set_Ref
=> False);
2736 -- Generate references and check No_Dependence restriction for parents
2738 if Is_Child_Unit
(E_Name
) then
2739 Pref
:= Prefix
(Name
(N
));
2740 Par_Name
:= Scope
(E_Name
);
2741 while Nkind
(Pref
) = N_Selected_Component
loop
2742 Change_Selected_Component_To_Expanded_Name
(Pref
);
2744 if Present
(Entity
(Selector_Name
(Pref
)))
2746 Present
(Renamed_Entity
(Entity
(Selector_Name
(Pref
))))
2747 and then Entity
(Selector_Name
(Pref
)) /= Par_Name
2749 -- The prefix is a child unit that denotes a renaming declaration.
2750 -- Replace the prefix directly with the renamed unit, because the
2751 -- rest of the prefix is irrelevant to the visibility of the real
2754 Rewrite
(Pref
, New_Occurrence_Of
(Par_Name
, Sloc
(Pref
)));
2758 Set_Entity_With_Checks
(Pref
, Par_Name
);
2760 Generate_Reference
(Par_Name
, Pref
);
2761 Check_Restriction_No_Dependence
(Pref
, N
);
2762 Pref
:= Prefix
(Pref
);
2764 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2765 -- is set to Standard_Standard, and no attempt should be made to
2766 -- further unwind scopes.
2768 if Par_Name
/= Standard_Standard
then
2769 Par_Name
:= Scope
(Par_Name
);
2772 -- Abandon processing in case of previous errors
2774 if No
(Par_Name
) then
2775 Check_Error_Detected
;
2780 if Present
(Entity
(Pref
))
2781 and then not Analyzed
(Parent
(Parent
(Entity
(Pref
))))
2783 -- If the entity is set without its unit being compiled, the
2784 -- original parent is a renaming, and Par_Name is the renamed
2785 -- entity. For visibility purposes, we need the original entity,
2786 -- which must be analyzed now because Load_Unit directly retrieves
2787 -- the renamed unit, and the renaming declaration itself has not
2790 Analyze
(Parent
(Parent
(Entity
(Pref
))));
2791 pragma Assert
(Renamed_Object
(Entity
(Pref
)) = Par_Name
);
2792 Par_Name
:= Entity
(Pref
);
2795 -- Guard against missing or misspelled child units
2797 if Present
(Par_Name
) then
2798 Set_Entity_With_Checks
(Pref
, Par_Name
);
2799 Generate_Reference
(Par_Name
, Pref
);
2802 pragma Assert
(Serious_Errors_Detected
/= 0);
2804 -- Mark the node to indicate that a related error has been posted.
2805 -- This defends further compilation passes against improper use of
2806 -- the invalid WITH clause node.
2808 Set_Error_Posted
(N
);
2809 Set_Name
(N
, Error
);
2814 -- If the withed unit is System, and a system extension pragma is
2815 -- present, compile the extension now, rather than waiting for a
2816 -- visibility check on a specific entity.
2818 if Chars
(E_Name
) = Name_System
2819 and then Scope
(E_Name
) = Standard_Standard
2820 and then Present
(System_Extend_Unit
)
2821 and then Present_System_Aux
(N
)
2823 -- If the extension is not present, an error will have been emitted
2828 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2829 -- to private_with units; they will be made visible later (just before
2830 -- the private part is analyzed)
2832 if Private_Present
(N
) then
2833 Set_Is_Immediately_Visible
(E_Name
, False);
2836 -- Propagate Fatal_Error setting from with'ed unit to current unit
2838 case Fatal_Error
(Get_Source_Unit
(Library_Unit
(N
))) is
2840 -- Nothing to do if with'ed unit had no error
2845 -- If with'ed unit had a detected fatal error, propagate it
2847 when Error_Detected
=>
2848 Set_Fatal_Error
(Current_Sem_Unit
, Error_Detected
);
2850 -- If with'ed unit had an ignored error, then propagate it but do not
2851 -- overide an existring setting.
2853 when Error_Ignored
=>
2854 if Fatal_Error
(Current_Sem_Unit
) = None
then
2855 Set_Fatal_Error
(Current_Sem_Unit
, Error_Ignored
);
2858 end Analyze_With_Clause
;
2860 ------------------------------
2861 -- Check_Private_Child_Unit --
2862 ------------------------------
2864 procedure Check_Private_Child_Unit
(N
: Node_Id
) is
2865 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2867 Curr_Unit
: Entity_Id
;
2868 Sub_Parent
: Node_Id
;
2869 Priv_Child
: Entity_Id
;
2870 Par_Lib
: Entity_Id
;
2873 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean;
2874 -- Returns true if and only if the library unit is declared with
2875 -- an explicit designation of private.
2877 -----------------------------
2878 -- Is_Private_Library_Unit --
2879 -----------------------------
2881 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean is
2882 Comp_Unit
: constant Node_Id
:= Parent
(Unit_Declaration_Node
(Unit
));
2885 return Private_Present
(Comp_Unit
);
2886 end Is_Private_Library_Unit
;
2888 -- Start of processing for Check_Private_Child_Unit
2891 if Nkind_In
(Lib_Unit
, N_Package_Body
, N_Subprogram_Body
) then
2892 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(N
)));
2893 Par_Lib
:= Curr_Unit
;
2895 elsif Nkind
(Lib_Unit
) = N_Subunit
then
2897 -- The parent is itself a body. The parent entity is to be found in
2898 -- the corresponding spec.
2900 Sub_Parent
:= Library_Unit
(N
);
2901 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(Sub_Parent
)));
2903 -- If the parent itself is a subunit, Curr_Unit is the entity of the
2904 -- enclosing body, retrieve the spec entity which is the proper
2905 -- ancestor we need for the following tests.
2907 if Ekind
(Curr_Unit
) = E_Package_Body
then
2908 Curr_Unit
:= Spec_Entity
(Curr_Unit
);
2911 Par_Lib
:= Curr_Unit
;
2914 Curr_Unit
:= Defining_Entity
(Lib_Unit
);
2916 Par_Lib
:= Curr_Unit
;
2917 Par_Spec
:= Parent_Spec
(Lib_Unit
);
2919 if No
(Par_Spec
) then
2922 Par_Lib
:= Defining_Entity
(Unit
(Par_Spec
));
2926 -- Loop through context items
2928 Item
:= First
(Context_Items
(N
));
2929 while Present
(Item
) loop
2931 -- Ada 2005 (AI-262): Allow private_with of a private child package
2932 -- in public siblings
2934 if Nkind
(Item
) = N_With_Clause
2935 and then not Implicit_With
(Item
)
2936 and then not Limited_Present
(Item
)
2937 and then Is_Private_Descendant
(Entity
(Name
(Item
)))
2939 Priv_Child
:= Entity
(Name
(Item
));
2942 Curr_Parent
: Entity_Id
:= Par_Lib
;
2943 Child_Parent
: Entity_Id
:= Scope
(Priv_Child
);
2944 Prv_Ancestor
: Entity_Id
:= Child_Parent
;
2945 Curr_Private
: Boolean := Is_Private_Library_Unit
(Curr_Unit
);
2948 -- If the child unit is a public child then locate the nearest
2949 -- private ancestor. Child_Parent will then be set to the
2950 -- parent of that ancestor.
2952 if not Is_Private_Library_Unit
(Priv_Child
) then
2953 while Present
(Prv_Ancestor
)
2954 and then not Is_Private_Library_Unit
(Prv_Ancestor
)
2956 Prv_Ancestor
:= Scope
(Prv_Ancestor
);
2959 if Present
(Prv_Ancestor
) then
2960 Child_Parent
:= Scope
(Prv_Ancestor
);
2964 while Present
(Curr_Parent
)
2965 and then Curr_Parent
/= Standard_Standard
2966 and then Curr_Parent
/= Child_Parent
2969 Curr_Private
or else Is_Private_Library_Unit
(Curr_Parent
);
2970 Curr_Parent
:= Scope
(Curr_Parent
);
2973 if No
(Curr_Parent
) then
2974 Curr_Parent
:= Standard_Standard
;
2977 if Curr_Parent
/= Child_Parent
then
2978 if Ekind
(Priv_Child
) = E_Generic_Package
2979 and then Chars
(Priv_Child
) in Text_IO_Package_Name
2980 and then Chars
(Scope
(Scope
(Priv_Child
))) = Name_Ada
2983 ("& is a nested package, not a compilation unit",
2984 Name
(Item
), Priv_Child
);
2988 ("unit in with clause is private child unit!", Item
);
2990 ("\current unit must also have parent&!",
2991 Item
, Child_Parent
);
2995 or else Private_Present
(Item
)
2996 or else Nkind_In
(Lib_Unit
, N_Package_Body
, N_Subunit
)
2997 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
2998 and then not Acts_As_Spec
(Parent
(Lib_Unit
)))
3004 ("current unit must also be private descendant of&",
3005 Item
, Child_Parent
);
3013 end Check_Private_Child_Unit
;
3015 ----------------------
3016 -- Check_Stub_Level --
3017 ----------------------
3019 procedure Check_Stub_Level
(N
: Node_Id
) is
3020 Par
: constant Node_Id
:= Parent
(N
);
3021 Kind
: constant Node_Kind
:= Nkind
(Par
);
3024 if Nkind_In
(Kind
, N_Package_Body
,
3028 and then Nkind_In
(Parent
(Par
), N_Compilation_Unit
, N_Subunit
)
3032 -- In an instance, a missing stub appears at any level. A warning
3033 -- message will have been emitted already for the missing file.
3035 elsif not In_Instance
then
3036 Error_Msg_N
("stub cannot appear in an inner scope", N
);
3038 elsif Expander_Active
then
3039 Error_Msg_N
("missing proper body", N
);
3041 end Check_Stub_Level
;
3043 ------------------------
3044 -- Expand_With_Clause --
3045 ------------------------
3047 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
) is
3048 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
3049 Ent
: constant Entity_Id
:= Entity
(Nam
);
3053 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
;
3054 -- Build name to be used in implicit with_clause. In most cases this
3055 -- is the source name, but if renamings are present we must make the
3056 -- original unit visible, not the one it renames. The entity in the
3057 -- with clause is the renamed unit, but the identifier is the one from
3058 -- the source, which allows us to recover the unit renaming.
3060 ---------------------
3061 -- Build_Unit_Name --
3062 ---------------------
3064 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
is
3069 if Nkind
(Nam
) = N_Identifier
then
3070 return New_Occurrence_Of
(Entity
(Nam
), Loc
);
3073 Ent
:= Entity
(Nam
);
3075 if Present
(Entity
(Selector_Name
(Nam
)))
3076 and then Chars
(Entity
(Selector_Name
(Nam
))) /= Chars
(Ent
)
3078 Nkind
(Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
))))
3079 = N_Package_Renaming_Declaration
3081 -- The name in the with_clause is of the form A.B.C, and B is
3082 -- given by a renaming declaration. In that case we may not
3083 -- have analyzed the unit for B, but replaced it directly in
3084 -- lib-load with the unit it renames. We have to make A.B
3085 -- visible, so analyze the declaration for B now, in case it
3086 -- has not been done yet.
3088 Ent
:= Entity
(Selector_Name
(Nam
));
3091 (Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
)))));
3095 Make_Expanded_Name
(Loc
,
3096 Chars
=> Chars
(Entity
(Nam
)),
3097 Prefix
=> Build_Unit_Name
(Prefix
(Nam
)),
3098 Selector_Name
=> New_Occurrence_Of
(Ent
, Loc
));
3099 Set_Entity
(Result
, Ent
);
3102 end Build_Unit_Name
;
3104 -- Start of processing for Expand_With_Clause
3108 Make_With_Clause
(Loc
,
3109 Name
=> Build_Unit_Name
(Nam
));
3111 P
:= Parent
(Unit_Declaration_Node
(Ent
));
3112 Set_Library_Unit
(Withn
, P
);
3113 Set_Corresponding_Spec
(Withn
, Ent
);
3114 Set_First_Name
(Withn
, True);
3115 Set_Implicit_With
(Withn
, True);
3117 -- If the unit is a package or generic package declaration, a private_
3118 -- with_clause on a child unit implies that the implicit with on the
3119 -- parent is also private.
3121 if Nkind_In
(Unit
(N
), N_Package_Declaration
,
3122 N_Generic_Package_Declaration
)
3124 Set_Private_Present
(Withn
, Private_Present
(Item
));
3127 Prepend
(Withn
, Context_Items
(N
));
3128 Mark_Rewrite_Insertion
(Withn
);
3129 Install_Withed_Unit
(Withn
);
3131 -- If we have "with X.Y;", we want to recurse on "X", except in the
3132 -- unusual case where X.Y is a renaming of X. In that case, the scope
3133 -- of X will be null.
3135 if Nkind
(Nam
) = N_Expanded_Name
3136 and then Present
(Scope
(Entity
(Prefix
(Nam
))))
3138 Expand_With_Clause
(Item
, Prefix
(Nam
), N
);
3140 end Expand_With_Clause
;
3142 --------------------------------
3143 -- Generate_Parent_References --
3144 --------------------------------
3146 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
) is
3148 P_Name
: Entity_Id
:= P_Id
;
3151 if Nkind
(N
) = N_Subunit
then
3154 Pref
:= Name
(Parent
(Defining_Entity
(N
)));
3157 if Nkind
(Pref
) = N_Expanded_Name
then
3159 -- Done already, if the unit has been compiled indirectly as
3160 -- part of the closure of its context because of inlining.
3165 while Nkind
(Pref
) = N_Selected_Component
loop
3166 Change_Selected_Component_To_Expanded_Name
(Pref
);
3167 Set_Entity
(Pref
, P_Name
);
3168 Set_Etype
(Pref
, Etype
(P_Name
));
3169 Generate_Reference
(P_Name
, Pref
, 'r');
3170 Pref
:= Prefix
(Pref
);
3171 P_Name
:= Scope
(P_Name
);
3174 -- The guard here on P_Name is to handle the error condition where
3175 -- the parent unit is missing because the file was not found.
3177 if Present
(P_Name
) then
3178 Set_Entity
(Pref
, P_Name
);
3179 Set_Etype
(Pref
, Etype
(P_Name
));
3180 Generate_Reference
(P_Name
, Pref
, 'r');
3181 Style
.Check_Identifier
(Pref
, P_Name
);
3183 end Generate_Parent_References
;
3185 ---------------------
3186 -- Has_With_Clause --
3187 ---------------------
3189 function Has_With_Clause
3192 Is_Limited
: Boolean := False) return Boolean
3196 function Named_Unit
(Clause
: Node_Id
) return Entity_Id
;
3197 -- Return the entity for the unit named in a [limited] with clause
3203 function Named_Unit
(Clause
: Node_Id
) return Entity_Id
is
3205 if Nkind
(Name
(Clause
)) = N_Selected_Component
then
3206 return Entity
(Selector_Name
(Name
(Clause
)));
3208 return Entity
(Name
(Clause
));
3212 -- Start of processing for Has_With_Clause
3215 if Present
(Context_Items
(C_Unit
)) then
3216 Item
:= First
(Context_Items
(C_Unit
));
3217 while Present
(Item
) loop
3218 if Nkind
(Item
) = N_With_Clause
3219 and then Limited_Present
(Item
) = Is_Limited
3220 and then Named_Unit
(Item
) = Pack
3230 end Has_With_Clause
;
3232 -----------------------------
3233 -- Implicit_With_On_Parent --
3234 -----------------------------
3236 procedure Implicit_With_On_Parent
3237 (Child_Unit
: Node_Id
;
3240 Loc
: constant Source_Ptr
:= Sloc
(N
);
3241 P
: constant Node_Id
:= Parent_Spec
(Child_Unit
);
3242 P_Unit
: Node_Id
:= Unit
(P
);
3243 P_Name
: constant Entity_Id
:= Get_Parent_Entity
(P_Unit
);
3246 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
;
3247 -- Build prefix of child unit name. Recurse if needed
3249 function Build_Unit_Name
return Node_Id
;
3250 -- If the unit is a child unit, build qualified name with all ancestors
3252 -------------------------
3253 -- Build_Ancestor_Name --
3254 -------------------------
3256 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
is
3257 P_Ref
: constant Node_Id
:=
3258 New_Occurrence_Of
(Defining_Entity
(P
), Loc
);
3259 P_Spec
: Node_Id
:= P
;
3262 -- Ancestor may have been rewritten as a package body. Retrieve
3263 -- the original spec to trace earlier ancestors.
3265 if Nkind
(P
) = N_Package_Body
3266 and then Nkind
(Original_Node
(P
)) = N_Package_Instantiation
3268 P_Spec
:= Original_Node
(P
);
3271 if No
(Parent_Spec
(P_Spec
)) then
3275 Make_Selected_Component
(Loc
,
3276 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Spec
))),
3277 Selector_Name
=> P_Ref
);
3279 end Build_Ancestor_Name
;
3281 ---------------------
3282 -- Build_Unit_Name --
3283 ---------------------
3285 function Build_Unit_Name
return Node_Id
is
3289 if No
(Parent_Spec
(P_Unit
)) then
3290 return New_Occurrence_Of
(P_Name
, Loc
);
3294 Make_Expanded_Name
(Loc
,
3295 Chars
=> Chars
(P_Name
),
3296 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Unit
))),
3297 Selector_Name
=> New_Occurrence_Of
(P_Name
, Loc
));
3298 Set_Entity
(Result
, P_Name
);
3301 end Build_Unit_Name
;
3303 -- Start of processing for Implicit_With_On_Parent
3306 -- The unit of the current compilation may be a package body that
3307 -- replaces an instance node. In this case we need the original instance
3308 -- node to construct the proper parent name.
3310 if Nkind
(P_Unit
) = N_Package_Body
3311 and then Nkind
(Original_Node
(P_Unit
)) = N_Package_Instantiation
3313 P_Unit
:= Original_Node
(P_Unit
);
3316 -- We add the implicit with if the child unit is the current unit being
3317 -- compiled. If the current unit is a body, we do not want to add an
3318 -- implicit_with a second time to the corresponding spec.
3320 if Nkind
(Child_Unit
) = N_Package_Declaration
3321 and then Child_Unit
/= Unit
(Cunit
(Current_Sem_Unit
))
3326 Withn
:= Make_With_Clause
(Loc
, Name
=> Build_Unit_Name
);
3328 Set_Library_Unit
(Withn
, P
);
3329 Set_Corresponding_Spec
(Withn
, P_Name
);
3330 Set_First_Name
(Withn
, True);
3331 Set_Implicit_With
(Withn
, True);
3333 -- Node is placed at the beginning of the context items, so that
3334 -- subsequent use clauses on the parent can be validated.
3336 Prepend
(Withn
, Context_Items
(N
));
3337 Mark_Rewrite_Insertion
(Withn
);
3338 Install_Withed_Unit
(Withn
);
3340 if Is_Child_Spec
(P_Unit
) then
3341 Implicit_With_On_Parent
(P_Unit
, N
);
3343 end Implicit_With_On_Parent
;
3349 function In_Chain
(E
: Entity_Id
) return Boolean is
3353 H
:= Current_Entity
(E
);
3354 while Present
(H
) loop
3365 ---------------------
3366 -- Install_Context --
3367 ---------------------
3369 procedure Install_Context
(N
: Node_Id
) is
3370 Lib_Unit
: constant Node_Id
:= Unit
(N
);
3373 Install_Context_Clauses
(N
);
3375 if Is_Child_Spec
(Lib_Unit
) then
3376 Install_Parents
(Lib_Unit
, Private_Present
(Parent
(Lib_Unit
)));
3379 Install_Limited_Context_Clauses
(N
);
3380 end Install_Context
;
3382 -----------------------------
3383 -- Install_Context_Clauses --
3384 -----------------------------
3386 procedure Install_Context_Clauses
(N
: Node_Id
) is
3387 Lib_Unit
: constant Node_Id
:= Unit
(N
);
3389 Uname_Node
: Entity_Id
;
3390 Check_Private
: Boolean := False;
3391 Decl_Node
: Node_Id
;
3392 Lib_Parent
: Entity_Id
;
3395 -- First skip configuration pragmas at the start of the context. They
3396 -- are not technically part of the context clause, but that's where the
3397 -- parser puts them. Note they were analyzed in Analyze_Context.
3399 Item
:= First
(Context_Items
(N
));
3400 while Present
(Item
)
3401 and then Nkind
(Item
) = N_Pragma
3402 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
3407 -- Loop through the actual context clause items. We process everything
3408 -- except Limited_With clauses in this routine. Limited_With clauses
3409 -- are separately installed (see Install_Limited_Context_Clauses).
3411 while Present
(Item
) loop
3413 -- Case of explicit WITH clause
3415 if Nkind
(Item
) = N_With_Clause
3416 and then not Implicit_With
(Item
)
3418 if Limited_Present
(Item
) then
3420 -- Limited withed units will be installed later
3424 -- If Name (Item) is not an entity name, something is wrong, and
3425 -- this will be detected in due course, for now ignore the item
3427 elsif not Is_Entity_Name
(Name
(Item
)) then
3430 elsif No
(Entity
(Name
(Item
))) then
3431 Set_Entity
(Name
(Item
), Any_Id
);
3435 Uname_Node
:= Entity
(Name
(Item
));
3437 if Is_Private_Descendant
(Uname_Node
) then
3438 Check_Private
:= True;
3441 Install_Withed_Unit
(Item
);
3443 Decl_Node
:= Unit_Declaration_Node
(Uname_Node
);
3445 -- If the unit is a subprogram instance, it appears nested within
3446 -- a package that carries the parent information.
3448 if Is_Generic_Instance
(Uname_Node
)
3449 and then Ekind
(Uname_Node
) /= E_Package
3451 Decl_Node
:= Parent
(Parent
(Decl_Node
));
3454 if Is_Child_Spec
(Decl_Node
) then
3455 if Nkind
(Name
(Item
)) = N_Expanded_Name
then
3456 Expand_With_Clause
(Item
, Prefix
(Name
(Item
)), N
);
3458 -- If not an expanded name, the child unit must be a
3459 -- renaming, nothing to do.
3464 elsif Nkind
(Decl_Node
) = N_Subprogram_Body
3465 and then not Acts_As_Spec
(Parent
(Decl_Node
))
3466 and then Is_Child_Spec
(Unit
(Library_Unit
(Parent
(Decl_Node
))))
3468 Implicit_With_On_Parent
3469 (Unit
(Library_Unit
(Parent
(Decl_Node
))), N
);
3472 -- Check license conditions unless this is a dummy unit
3474 if Sloc
(Library_Unit
(Item
)) /= No_Location
then
3475 License_Check
: declare
3476 Withu
: constant Unit_Number_Type
:=
3477 Get_Source_Unit
(Library_Unit
(Item
));
3478 Withl
: constant License_Type
:=
3479 License
(Source_Index
(Withu
));
3480 Unitl
: constant License_Type
:=
3481 License
(Source_Index
(Current_Sem_Unit
));
3483 procedure License_Error
;
3484 -- Signal error of bad license
3490 procedure License_Error
is
3493 ("license of withed unit & may be inconsistent??",
3497 -- Start of processing for License_Check
3500 -- Exclude license check if withed unit is an internal unit.
3501 -- This situation arises e.g. with the GPL version of GNAT.
3503 if Is_Internal_File_Name
(Unit_File_Name
(Withu
)) then
3506 -- Otherwise check various cases
3518 if Withl
= Restricted
then
3522 when Modified_GPL
=>
3523 if Withl
= Restricted
or else Withl
= GPL
then
3527 when Unrestricted
=>
3534 -- Case of USE PACKAGE clause
3536 elsif Nkind
(Item
) = N_Use_Package_Clause
then
3537 Analyze_Use_Package
(Item
);
3539 -- Case of USE TYPE clause
3541 elsif Nkind
(Item
) = N_Use_Type_Clause
then
3542 Analyze_Use_Type
(Item
);
3546 elsif Nkind
(Item
) = N_Pragma
then
3554 if Is_Child_Spec
(Lib_Unit
) then
3556 -- The unit also has implicit with_clauses on its own parents
3558 if No
(Context_Items
(N
)) then
3559 Set_Context_Items
(N
, New_List
);
3562 Implicit_With_On_Parent
(Lib_Unit
, N
);
3565 -- If the unit is a body, the context of the specification must also
3566 -- be installed. That includes private with_clauses in that context.
3568 if Nkind
(Lib_Unit
) = N_Package_Body
3569 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
3570 and then not Acts_As_Spec
(N
))
3572 Install_Context
(Library_Unit
(N
));
3574 -- Only install private with-clauses of a spec that comes from
3575 -- source, excluding specs created for a subprogram body that is
3578 if Comes_From_Source
(Library_Unit
(N
)) then
3579 Install_Private_With_Clauses
3580 (Defining_Entity
(Unit
(Library_Unit
(N
))));
3583 if Is_Child_Spec
(Unit
(Library_Unit
(N
))) then
3585 -- If the unit is the body of a public child unit, the private
3586 -- declarations of the parent must be made visible. If the child
3587 -- unit is private, the private declarations have been installed
3588 -- already in the call to Install_Parents for the spec. Installing
3589 -- private declarations must be done for all ancestors of public
3590 -- child units. In addition, sibling units mentioned in the
3591 -- context clause of the body are directly visible.
3599 Lib_Spec
:= Unit
(Library_Unit
(N
));
3600 while Is_Child_Spec
(Lib_Spec
) loop
3601 P
:= Unit
(Parent_Spec
(Lib_Spec
));
3602 P_Name
:= Defining_Entity
(P
);
3604 if not (Private_Present
(Parent
(Lib_Spec
)))
3605 and then not In_Private_Part
(P_Name
)
3607 Install_Private_Declarations
(P_Name
);
3608 Install_Private_With_Clauses
(P_Name
);
3609 Set_Use
(Private_Declarations
(Specification
(P
)));
3617 -- For a package body, children in context are immediately visible
3619 Install_Siblings
(Defining_Entity
(Unit
(Library_Unit
(N
))), N
);
3622 if Nkind_In
(Lib_Unit
, N_Generic_Package_Declaration
,
3623 N_Generic_Subprogram_Declaration
,
3624 N_Package_Declaration
,
3625 N_Subprogram_Declaration
)
3627 if Is_Child_Spec
(Lib_Unit
) then
3628 Lib_Parent
:= Defining_Entity
(Unit
(Parent_Spec
(Lib_Unit
)));
3629 Set_Is_Private_Descendant
3630 (Defining_Entity
(Lib_Unit
),
3631 Is_Private_Descendant
(Lib_Parent
)
3632 or else Private_Present
(Parent
(Lib_Unit
)));
3635 Set_Is_Private_Descendant
3636 (Defining_Entity
(Lib_Unit
),
3637 Private_Present
(Parent
(Lib_Unit
)));
3641 if Check_Private
then
3642 Check_Private_Child_Unit
(N
);
3644 end Install_Context_Clauses
;
3646 -------------------------------------
3647 -- Install_Limited_Context_Clauses --
3648 -------------------------------------
3650 procedure Install_Limited_Context_Clauses
(N
: Node_Id
) is
3653 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
);
3654 -- Check that the unlimited view of a given compilation_unit is not
3655 -- already visible through "use + renamings".
3657 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
);
3658 -- Check that if a limited_with clause of a given compilation_unit
3659 -- mentions a descendant of a private child of some library unit, then
3660 -- the given compilation_unit must be the declaration of a private
3661 -- descendant of that library unit, or a public descendant of such. The
3662 -- code is analogous to that of Check_Private_Child_Unit but we cannot
3663 -- use entities on the limited with_clauses because their units have not
3664 -- been analyzed, so we have to climb the tree of ancestors looking for
3665 -- private keywords.
3667 procedure Expand_Limited_With_Clause
3668 (Comp_Unit
: Node_Id
;
3671 -- If a child unit appears in a limited_with clause, there are implicit
3672 -- limited_with clauses on all parents that are not already visible
3673 -- through a regular with clause. This procedure creates the implicit
3674 -- limited with_clauses for the parents and loads the corresponding
3675 -- units. The shadow entities are created when the inserted clause is
3676 -- analyzed. Implements Ada 2005 (AI-50217).
3678 ---------------------
3679 -- Check_Renamings --
3680 ---------------------
3682 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
) is
3691 pragma Assert
(Nkind
(W
) = N_With_Clause
);
3693 -- Protect the frontend against previous critical errors
3695 case Nkind
(Unit
(Library_Unit
(W
))) is
3696 when N_Subprogram_Declaration |
3697 N_Package_Declaration |
3698 N_Generic_Subprogram_Declaration |
3699 N_Generic_Package_Declaration
=>
3706 -- Check "use + renamings"
3708 WEnt
:= Defining_Unit_Name
(Specification
(Unit
(Library_Unit
(W
))));
3709 Spec
:= Specification
(Unit
(P
));
3711 Item
:= First
(Visible_Declarations
(Spec
));
3712 while Present
(Item
) loop
3714 -- Look only at use package clauses
3716 if Nkind
(Item
) = N_Use_Package_Clause
then
3718 -- Traverse the list of packages
3720 Nam
:= First
(Names
(Item
));
3721 while Present
(Nam
) loop
3724 pragma Assert
(Present
(Parent
(E
)));
3726 if Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
3727 and then Renamed_Entity
(E
) = WEnt
3729 -- The unlimited view is visible through use clause and
3730 -- renamings. There is no need to generate the error
3731 -- message here because Is_Visible_Through_Renamings
3732 -- takes care of generating the precise error message.
3736 elsif Nkind
(Parent
(E
)) = N_Package_Specification
then
3738 -- The use clause may refer to a local package.
3739 -- Check all the enclosing scopes.
3742 while E2
/= Standard_Standard
and then E2
/= WEnt
loop
3748 ("unlimited view visible through use clause ", W
);
3760 -- Recursive call to check all the ancestors
3762 if Is_Child_Spec
(Unit
(P
)) then
3763 Check_Renamings
(P
=> Parent_Spec
(Unit
(P
)), W
=> W
);
3765 end Check_Renamings
;
3767 ---------------------------------------
3768 -- Check_Private_Limited_Withed_Unit --
3769 ---------------------------------------
3771 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
) is
3772 Curr_Parent
: Node_Id
;
3773 Child_Parent
: Node_Id
;
3774 Curr_Private
: Boolean;
3777 -- Compilation unit of the parent of the withed library unit
3779 Child_Parent
:= Library_Unit
(Item
);
3781 -- If the child unit is a public child, then locate its nearest
3782 -- private ancestor, if any, then Child_Parent will then be set to
3783 -- the parent of that ancestor.
3785 if not Private_Present
(Library_Unit
(Item
)) then
3786 while Present
(Child_Parent
)
3787 and then not Private_Present
(Child_Parent
)
3789 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3792 if No
(Child_Parent
) then
3797 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3799 -- Traverse all the ancestors of the current compilation unit to
3800 -- check if it is a descendant of named library unit.
3802 Curr_Parent
:= Parent
(Item
);
3803 Curr_Private
:= Private_Present
(Curr_Parent
);
3805 while Present
(Parent_Spec
(Unit
(Curr_Parent
)))
3806 and then Curr_Parent
/= Child_Parent
3808 Curr_Parent
:= Parent_Spec
(Unit
(Curr_Parent
));
3809 Curr_Private
:= Curr_Private
or else Private_Present
(Curr_Parent
);
3812 if Curr_Parent
/= Child_Parent
then
3814 ("unit in with clause is private child unit!", Item
);
3816 ("\current unit must also have parent&!",
3817 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3819 elsif Private_Present
(Parent
(Item
))
3820 or else Curr_Private
3821 or else Private_Present
(Item
)
3822 or else Nkind_In
(Unit
(Parent
(Item
)), N_Package_Body
,
3826 -- Current unit is private, of descendant of a private unit
3832 ("current unit must also be private descendant of&",
3833 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3835 end Check_Private_Limited_Withed_Unit
;
3837 --------------------------------
3838 -- Expand_Limited_With_Clause --
3839 --------------------------------
3841 procedure Expand_Limited_With_Clause
3842 (Comp_Unit
: Node_Id
;
3846 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
3847 Unum
: Unit_Number_Type
;
3850 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean;
3851 -- Returns true if the context already includes a with_clause for
3852 -- this unit. If the with_clause is non-limited, the unit is fully
3853 -- visible and an implicit limited_with should not be created. If
3854 -- there is already a limited_with clause for W, a second one is
3855 -- simply redundant.
3857 --------------------------
3858 -- Previous_Withed_Unit --
3859 --------------------------
3861 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean is
3865 -- A limited with_clause cannot appear in the same context_clause
3866 -- as a nonlimited with_clause which mentions the same library.
3868 Item
:= First
(Context_Items
(Comp_Unit
));
3869 while Present
(Item
) loop
3870 if Nkind
(Item
) = N_With_Clause
3871 and then Library_Unit
(Item
) = Library_Unit
(W
)
3880 end Previous_Withed_Unit
;
3882 -- Start of processing for Expand_Limited_With_Clause
3885 if Nkind
(Nam
) = N_Identifier
then
3887 -- Create node for name of withed unit
3890 Make_With_Clause
(Loc
,
3891 Name
=> New_Copy
(Nam
));
3893 else pragma Assert
(Nkind
(Nam
) = N_Selected_Component
);
3895 Make_With_Clause
(Loc
,
3896 Name
=> Make_Selected_Component
(Loc
,
3897 Prefix
=> New_Copy_Tree
(Prefix
(Nam
)),
3898 Selector_Name
=> New_Copy
(Selector_Name
(Nam
))));
3899 Set_Parent
(Withn
, Parent
(N
));
3902 Set_Limited_Present
(Withn
);
3903 Set_First_Name
(Withn
);
3904 Set_Implicit_With
(Withn
);
3908 (Load_Name
=> Get_Spec_Name
(Get_Unit_Name
(Nam
)),
3913 -- Do not generate a limited_with_clause on the current unit. This
3914 -- path is taken when a unit has a limited_with clause on one of its
3917 if Unum
= Current_Sem_Unit
then
3921 Set_Library_Unit
(Withn
, Cunit
(Unum
));
3922 Set_Corresponding_Spec
3923 (Withn
, Specification
(Unit
(Cunit
(Unum
))));
3925 if not Previous_Withed_Unit
(Withn
) then
3926 Prepend
(Withn
, Context_Items
(Parent
(N
)));
3927 Mark_Rewrite_Insertion
(Withn
);
3929 -- Add implicit limited_with_clauses for parents of child units
3930 -- mentioned in limited_with clauses.
3932 if Nkind
(Nam
) = N_Selected_Component
then
3933 Expand_Limited_With_Clause
(Comp_Unit
, Prefix
(Nam
), N
);
3938 if not Limited_View_Installed
(Withn
) then
3939 Install_Limited_Withed_Unit
(Withn
);
3942 end Expand_Limited_With_Clause
;
3944 -- Start of processing for Install_Limited_Context_Clauses
3947 Item
:= First
(Context_Items
(N
));
3948 while Present
(Item
) loop
3949 if Nkind
(Item
) = N_With_Clause
3950 and then Limited_Present
(Item
)
3951 and then not Error_Posted
(Item
)
3953 if Nkind
(Name
(Item
)) = N_Selected_Component
then
3954 Expand_Limited_With_Clause
3955 (Comp_Unit
=> N
, Nam
=> Prefix
(Name
(Item
)), N
=> Item
);
3958 Check_Private_Limited_Withed_Unit
(Item
);
3960 if not Implicit_With
(Item
) and then Is_Child_Spec
(Unit
(N
)) then
3961 Check_Renamings
(Parent_Spec
(Unit
(N
)), Item
);
3964 -- A unit may have a limited with on itself if it has a limited
3965 -- with_clause on one of its child units. In that case it is
3966 -- already being compiled and it makes no sense to install its
3969 -- If the item is a limited_private_with_clause, install it if the
3970 -- current unit is a body or if it is a private child. Otherwise
3971 -- the private clause is installed before analyzing the private
3972 -- part of the current unit.
3974 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
)
3975 and then not Limited_View_Installed
(Item
)
3977 not Is_Ancestor_Unit
3978 (Library_Unit
(Item
), Cunit
(Current_Sem_Unit
))
3980 if not Private_Present
(Item
)
3981 or else Private_Present
(N
)
3982 or else Nkind_In
(Unit
(N
), N_Package_Body
,
3986 Install_Limited_Withed_Unit
(Item
);
3994 -- Ada 2005 (AI-412): Examine visible declarations of a package spec,
3995 -- looking for incomplete subtype declarations of incomplete types
3996 -- visible through a limited with clause.
3998 if Ada_Version
>= Ada_2005
3999 and then Analyzed
(N
)
4000 and then Nkind
(Unit
(N
)) = N_Package_Declaration
4005 Non_Lim_View
: Entity_Id
;
4008 Decl
:= First
(Visible_Declarations
(Specification
(Unit
(N
))));
4009 while Present
(Decl
) loop
4010 if Nkind
(Decl
) = N_Subtype_Declaration
4012 Ekind
(Defining_Identifier
(Decl
)) = E_Incomplete_Subtype
4014 From_Limited_With
(Defining_Identifier
(Decl
))
4016 Def_Id
:= Defining_Identifier
(Decl
);
4017 Non_Lim_View
:= Non_Limited_View
(Def_Id
);
4019 if not Is_Incomplete_Type
(Non_Lim_View
) then
4021 -- Convert an incomplete subtype declaration into a
4022 -- corresponding non-limited view subtype declaration.
4023 -- This is usually the case when analyzing a body that
4024 -- has regular with clauses, when the spec has limited
4027 -- If the non-limited view is still incomplete, it is
4028 -- the dummy entry already created, and the declaration
4029 -- cannot be reanalyzed. This is the case when installing
4030 -- a parent unit that has limited with-clauses.
4032 Set_Subtype_Indication
(Decl
,
4033 New_Occurrence_Of
(Non_Lim_View
, Sloc
(Def_Id
)));
4034 Set_Etype
(Def_Id
, Non_Lim_View
);
4035 Set_Ekind
(Def_Id
, Subtype_Kind
(Ekind
(Non_Lim_View
)));
4036 Set_Analyzed
(Decl
, False);
4038 -- Reanalyze the declaration, suppressing the call to
4039 -- Enter_Name to avoid duplicate names.
4041 Analyze_Subtype_Declaration
4051 end Install_Limited_Context_Clauses
;
4053 ---------------------
4054 -- Install_Parents --
4055 ---------------------
4057 procedure Install_Parents
(Lib_Unit
: Node_Id
; Is_Private
: Boolean) is
4064 P
:= Unit
(Parent_Spec
(Lib_Unit
));
4065 P_Name
:= Get_Parent_Entity
(P
);
4067 if Etype
(P_Name
) = Any_Type
then
4071 if Ekind
(P_Name
) = E_Generic_Package
4072 and then not Nkind_In
(Lib_Unit
, N_Generic_Subprogram_Declaration
,
4073 N_Generic_Package_Declaration
)
4074 and then Nkind
(Lib_Unit
) not in N_Generic_Renaming_Declaration
4077 ("child of a generic package must be a generic unit", Lib_Unit
);
4079 elsif not Is_Package_Or_Generic_Package
(P_Name
) then
4081 ("parent unit must be package or generic package", Lib_Unit
);
4082 raise Unrecoverable_Error
;
4084 elsif Present
(Renamed_Object
(P_Name
)) then
4085 Error_Msg_N
("parent unit cannot be a renaming", Lib_Unit
);
4086 raise Unrecoverable_Error
;
4088 -- Verify that a child of an instance is itself an instance, or the
4089 -- renaming of one. Given that an instance that is a unit is replaced
4090 -- with a package declaration, check against the original node. The
4091 -- parent may be currently being instantiated, in which case it appears
4092 -- as a declaration, but the generic_parent is already established
4093 -- indicating that we deal with an instance.
4095 elsif Nkind
(Original_Node
(P
)) = N_Package_Instantiation
then
4096 if Nkind
(Lib_Unit
) in N_Renaming_Declaration
4097 or else Nkind
(Original_Node
(Lib_Unit
)) in N_Generic_Instantiation
4099 (Nkind
(Lib_Unit
) = N_Package_Declaration
4100 and then Present
(Generic_Parent
(Specification
(Lib_Unit
))))
4105 ("child of an instance must be an instance or renaming",
4110 -- This is the recursive call that ensures all parents are loaded
4112 if Is_Child_Spec
(P
) then
4114 Is_Private
or else Private_Present
(Parent
(Lib_Unit
)));
4117 -- Now we can install the context for this parent
4119 Install_Context_Clauses
(Parent_Spec
(Lib_Unit
));
4120 Install_Limited_Context_Clauses
(Parent_Spec
(Lib_Unit
));
4121 Install_Siblings
(P_Name
, Parent
(Lib_Unit
));
4123 -- The child unit is in the declarative region of the parent. The parent
4124 -- must therefore appear in the scope stack and be visible, as when
4125 -- compiling the corresponding body. If the child unit is private or it
4126 -- is a package body, private declarations must be accessible as well.
4127 -- Use declarations in the parent must also be installed. Finally, other
4128 -- child units of the same parent that are in the context are
4129 -- immediately visible.
4131 -- Find entity for compilation unit, and set its private descendant
4132 -- status as needed. Indicate that it is a compilation unit, which is
4133 -- redundant in general, but needed if this is a generated child spec
4134 -- for a child body without previous spec.
4136 E_Name
:= Defining_Entity
(Lib_Unit
);
4138 Set_Is_Child_Unit
(E_Name
);
4139 Set_Is_Compilation_Unit
(E_Name
);
4141 Set_Is_Private_Descendant
(E_Name
,
4142 Is_Private_Descendant
(P_Name
)
4143 or else Private_Present
(Parent
(Lib_Unit
)));
4145 P_Spec
:= Package_Specification
(P_Name
);
4146 Push_Scope
(P_Name
);
4148 -- Save current visibility of unit
4150 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
:=
4151 Is_Immediately_Visible
(P_Name
);
4152 Set_Is_Immediately_Visible
(P_Name
);
4153 Install_Visible_Declarations
(P_Name
);
4154 Set_Use
(Visible_Declarations
(P_Spec
));
4156 -- If the parent is a generic unit, its formal part may contain formal
4157 -- packages and use clauses for them.
4159 if Ekind
(P_Name
) = E_Generic_Package
then
4160 Set_Use
(Generic_Formal_Declarations
(Parent
(P_Spec
)));
4163 if Is_Private
or else Private_Present
(Parent
(Lib_Unit
)) then
4164 Install_Private_Declarations
(P_Name
);
4165 Install_Private_With_Clauses
(P_Name
);
4166 Set_Use
(Private_Declarations
(P_Spec
));
4168 end Install_Parents
;
4170 ----------------------------------
4171 -- Install_Private_With_Clauses --
4172 ----------------------------------
4174 procedure Install_Private_With_Clauses
(P
: Entity_Id
) is
4175 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
4179 if Debug_Flag_I
then
4180 Write_Str
("install private with clauses of ");
4181 Write_Name
(Chars
(P
));
4185 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
4186 Item
:= First
(Context_Items
(Parent
(Decl
)));
4187 while Present
(Item
) loop
4188 if Nkind
(Item
) = N_With_Clause
4189 and then Private_Present
(Item
)
4191 -- If the unit is an ancestor of the current one, it is the
4192 -- case of a private limited with clause on a child unit, and
4193 -- the compilation of one of its descendants, In that case the
4194 -- limited view is errelevant.
4196 if Limited_Present
(Item
) then
4197 if not Limited_View_Installed
(Item
)
4199 not Is_Ancestor_Unit
(Library_Unit
(Item
),
4200 Cunit
(Current_Sem_Unit
))
4202 Install_Limited_Withed_Unit
(Item
);
4205 Install_Withed_Unit
(Item
, Private_With_OK
=> True);
4212 end Install_Private_With_Clauses
;
4214 ----------------------
4215 -- Install_Siblings --
4216 ----------------------
4218 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
) is
4224 -- Iterate over explicit with clauses, and check whether the scope of
4225 -- each entity is an ancestor of the current unit, in which case it is
4226 -- immediately visible.
4228 Item
:= First
(Context_Items
(N
));
4229 while Present
(Item
) loop
4231 -- Do not install private_with_clauses declaration, unless unit
4232 -- is itself a private child unit, or is a body. Note that for a
4233 -- subprogram body the private_with_clause does not take effect until
4234 -- after the specification.
4236 if Nkind
(Item
) /= N_With_Clause
4237 or else Implicit_With
(Item
)
4238 or else Limited_Present
(Item
)
4239 or else Error_Posted
(Item
)
4243 elsif not Private_Present
(Item
)
4244 or else Private_Present
(N
)
4245 or else Nkind
(Unit
(N
)) = N_Package_Body
4247 Id
:= Entity
(Name
(Item
));
4249 if Is_Child_Unit
(Id
)
4250 and then Is_Ancestor_Package
(Scope
(Id
), U_Name
)
4252 Set_Is_Immediately_Visible
(Id
);
4254 -- Check for the presence of another unit in the context that
4255 -- may be inadvertently hidden by the child.
4257 Prev
:= Current_Entity
(Id
);
4260 and then Is_Immediately_Visible
(Prev
)
4261 and then not Is_Child_Unit
(Prev
)
4267 Clause
:= First
(Context_Items
(N
));
4268 while Present
(Clause
) loop
4269 if Nkind
(Clause
) = N_With_Clause
4270 and then Entity
(Name
(Clause
)) = Prev
4273 ("child unit& hides compilation unit " &
4274 "with the same name??",
4284 -- The With_Clause may be on a grand-child or one of its further
4285 -- descendants, which makes a child immediately visible. Examine
4286 -- ancestry to determine whether such a child exists. For example,
4287 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
4288 -- is immediately visible.
4290 elsif Is_Child_Unit
(Id
) then
4296 while Is_Child_Unit
(Par
) loop
4297 if Is_Ancestor_Package
(Scope
(Par
), U_Name
) then
4298 Set_Is_Immediately_Visible
(Par
);
4307 -- If the item is a private with-clause on a child unit, the parent
4308 -- may have been installed already, but the child unit must remain
4309 -- invisible until installed in a private part or body, unless there
4310 -- is already a regular with_clause for it in the current unit.
4312 elsif Private_Present
(Item
) then
4313 Id
:= Entity
(Name
(Item
));
4315 if Is_Child_Unit
(Id
) then
4319 function In_Context
return Boolean;
4320 -- Scan context of current unit, to check whether there is
4321 -- a with_clause on the same unit as a private with-clause
4322 -- on a parent, in which case child unit is visible. If the
4323 -- unit is a grand-child, the same applies to its parent.
4329 function In_Context
return Boolean is
4332 First
(Context_Items
(Cunit
(Current_Sem_Unit
)));
4333 while Present
(Clause
) loop
4334 if Nkind
(Clause
) = N_With_Clause
4335 and then Comes_From_Source
(Clause
)
4336 and then Is_Entity_Name
(Name
(Clause
))
4337 and then not Private_Present
(Clause
)
4339 if Entity
(Name
(Clause
)) = Id
4341 (Nkind
(Name
(Clause
)) = N_Expanded_Name
4342 and then Entity
(Prefix
(Name
(Clause
))) = Id
)
4355 Set_Is_Visible_Lib_Unit
(Id
, In_Context
);
4362 end Install_Siblings
;
4364 ---------------------------------
4365 -- Install_Limited_Withed_Unit --
4366 ---------------------------------
4368 procedure Install_Limited_Withed_Unit
(N
: Node_Id
) is
4369 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
4372 Is_Child_Package
: Boolean := False;
4373 Lim_Header
: Entity_Id
;
4374 Lim_Typ
: Entity_Id
;
4376 procedure Check_Body_Required
;
4377 -- A unit mentioned in a limited with_clause may not be mentioned in
4378 -- a regular with_clause, but must still be included in the current
4379 -- partition. We need to determine whether the unit needs a body, so
4380 -- that the binder can determine the name of the file to be compiled.
4381 -- Checking whether a unit needs a body can be done without semantic
4382 -- analysis, by examining the nature of the declarations in the package.
4384 function Has_Limited_With_Clause
4385 (C_Unit
: Entity_Id
;
4386 Pack
: Entity_Id
) return Boolean;
4387 -- Determine whether any package in the ancestor chain starting with
4388 -- C_Unit has a limited with clause for package Pack.
4390 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean;
4391 -- Check if some package installed though normal with-clauses has a
4392 -- renaming declaration of package P. AARM 10.1.2(21/2).
4394 -------------------------
4395 -- Check_Body_Required --
4396 -------------------------
4398 procedure Check_Body_Required
is
4399 PA
: constant List_Id
:=
4400 Pragmas_After
(Aux_Decls_Node
(Parent
(P_Unit
)));
4402 procedure Check_Declarations
(Spec
: Node_Id
);
4403 -- Recursive procedure that does the work and checks nested packages
4405 ------------------------
4406 -- Check_Declarations --
4407 ------------------------
4409 procedure Check_Declarations
(Spec
: Node_Id
) is
4411 Incomplete_Decls
: constant Elist_Id
:= New_Elmt_List
;
4413 Subp_List
: constant Elist_Id
:= New_Elmt_List
;
4415 procedure Check_Pragma_Import
(P
: Node_Id
);
4416 -- If a pragma import applies to a previous subprogram, the
4417 -- enclosing unit may not need a body. The processing is syntactic
4418 -- and does not require a declaration to be analyzed. The code
4419 -- below also handles pragma Import when applied to a subprogram
4420 -- that renames another. In this case the pragma applies to the
4423 -- Chains of multiple renames are not handled by the code below.
4424 -- It is probably impossible to handle all cases without proper
4425 -- name resolution. In such cases the algorithm is conservative
4426 -- and will indicate that a body is needed???
4428 -------------------------
4429 -- Check_Pragma_Import --
4430 -------------------------
4432 procedure Check_Pragma_Import
(P
: Node_Id
) is
4438 procedure Remove_Homonyms
(E
: Node_Id
);
4439 -- Make one pass over list of subprograms. Called again if
4440 -- subprogram is a renaming. E is known to be an identifier.
4442 ---------------------
4443 -- Remove_Homonyms --
4444 ---------------------
4446 procedure Remove_Homonyms
(E
: Node_Id
) is
4447 R
: Entity_Id
:= Empty
;
4448 -- Name of renamed entity, if any
4451 Subp_Id
:= First_Elmt
(Subp_List
);
4452 while Present
(Subp_Id
) loop
4453 if Chars
(Node
(Subp_Id
)) = Chars
(E
) then
4454 if Nkind
(Parent
(Parent
(Node
(Subp_Id
))))
4455 /= N_Subprogram_Renaming_Declaration
4458 Next_Elmt
(Subp_Id
);
4459 Remove_Elmt
(Subp_List
, Prev_Id
);
4461 R
:= Name
(Parent
(Parent
(Node
(Subp_Id
))));
4465 Next_Elmt
(Subp_Id
);
4470 if Nkind
(R
) = N_Identifier
then
4471 Remove_Homonyms
(R
);
4473 elsif Nkind
(R
) = N_Selected_Component
then
4474 Remove_Homonyms
(Selector_Name
(R
));
4476 -- Renaming of attribute
4482 end Remove_Homonyms
;
4484 -- Start of processing for Check_Pragma_Import
4487 -- Find name of entity in Import pragma. We have not analyzed
4488 -- the construct, so we must guard against syntax errors.
4490 Arg
:= Next
(First
(Pragma_Argument_Associations
(P
)));
4493 or else Nkind
(Expression
(Arg
)) /= N_Identifier
4497 Imported
:= Expression
(Arg
);
4500 Remove_Homonyms
(Imported
);
4501 end Check_Pragma_Import
;
4503 -- Start of processing for Check_Declarations
4506 -- Search for Elaborate Body pragma
4508 Decl
:= First
(Visible_Declarations
(Spec
));
4509 while Present
(Decl
)
4510 and then Nkind
(Decl
) = N_Pragma
4512 if Get_Pragma_Id
(Decl
) = Pragma_Elaborate_Body
then
4513 Set_Body_Required
(Library_Unit
(N
));
4520 -- Look for declarations that require the presence of a body. We
4521 -- have already skipped pragmas at the start of the list.
4523 while Present
(Decl
) loop
4525 -- Subprogram that comes from source means body may be needed.
4526 -- Save for subsequent examination of import pragmas.
4528 if Comes_From_Source
(Decl
)
4529 and then (Nkind_In
(Decl
, N_Subprogram_Declaration
,
4530 N_Subprogram_Renaming_Declaration
,
4531 N_Generic_Subprogram_Declaration
))
4533 Append_Elmt
(Defining_Entity
(Decl
), Subp_List
);
4535 -- Package declaration of generic package declaration. We need
4536 -- to recursively examine nested declarations.
4538 elsif Nkind_In
(Decl
, N_Package_Declaration
,
4539 N_Generic_Package_Declaration
)
4541 Check_Declarations
(Specification
(Decl
));
4543 elsif Nkind
(Decl
) = N_Pragma
4544 and then Pragma_Name
(Decl
) = Name_Import
4546 Check_Pragma_Import
(Decl
);
4552 -- Same set of tests for private part. In addition to subprograms
4553 -- detect the presence of Taft Amendment types (incomplete types
4554 -- completed in the body).
4556 Decl
:= First
(Private_Declarations
(Spec
));
4557 while Present
(Decl
) loop
4558 if Comes_From_Source
(Decl
)
4559 and then (Nkind_In
(Decl
, N_Subprogram_Declaration
,
4560 N_Subprogram_Renaming_Declaration
,
4561 N_Generic_Subprogram_Declaration
))
4563 Append_Elmt
(Defining_Entity
(Decl
), Subp_List
);
4565 elsif Nkind_In
(Decl
, N_Package_Declaration
,
4566 N_Generic_Package_Declaration
)
4568 Check_Declarations
(Specification
(Decl
));
4570 -- Collect incomplete type declarations for separate pass
4572 elsif Nkind
(Decl
) = N_Incomplete_Type_Declaration
then
4573 Append_Elmt
(Decl
, Incomplete_Decls
);
4575 elsif Nkind
(Decl
) = N_Pragma
4576 and then Pragma_Name
(Decl
) = Name_Import
4578 Check_Pragma_Import
(Decl
);
4584 -- Now check incomplete declarations to locate Taft amendment
4585 -- types. This can be done by examining the defining identifiers
4586 -- of type declarations without real semantic analysis.
4592 Inc
:= First_Elmt
(Incomplete_Decls
);
4593 while Present
(Inc
) loop
4594 Decl
:= Next
(Node
(Inc
));
4595 while Present
(Decl
) loop
4596 if Nkind
(Decl
) = N_Full_Type_Declaration
4597 and then Chars
(Defining_Identifier
(Decl
)) =
4598 Chars
(Defining_Identifier
(Node
(Inc
)))
4606 -- If no completion, this is a TAT, and a body is needed
4609 Set_Body_Required
(Library_Unit
(N
));
4617 -- Finally, check whether there are subprograms that still require
4618 -- a body, i.e. are not renamings or null.
4620 if not Is_Empty_Elmt_List
(Subp_List
) then
4626 Subp_Id
:= First_Elmt
(Subp_List
);
4627 Spec
:= Parent
(Node
(Subp_Id
));
4629 while Present
(Subp_Id
) loop
4630 if Nkind
(Parent
(Spec
))
4631 = N_Subprogram_Renaming_Declaration
4635 elsif Nkind
(Spec
) = N_Procedure_Specification
4636 and then Null_Present
(Spec
)
4641 Set_Body_Required
(Library_Unit
(N
));
4645 Next_Elmt
(Subp_Id
);
4649 end Check_Declarations
;
4651 -- Start of processing for Check_Body_Required
4654 -- If this is an imported package (Java and CIL usage) no body is
4655 -- needed. Scan list of pragmas that may follow a compilation unit
4656 -- to look for a relevant pragma Import.
4658 if Present
(PA
) then
4664 while Present
(Prag
) loop
4665 if Nkind
(Prag
) = N_Pragma
4666 and then Get_Pragma_Id
(Prag
) = Pragma_Import
4676 Check_Declarations
(Specification
(P_Unit
));
4677 end Check_Body_Required
;
4679 -----------------------------
4680 -- Has_Limited_With_Clause --
4681 -----------------------------
4683 function Has_Limited_With_Clause
4684 (C_Unit
: Entity_Id
;
4685 Pack
: Entity_Id
) return Boolean
4692 while Present
(Par
) loop
4693 if Ekind
(Par
) /= E_Package
then
4697 -- Retrieve the Compilation_Unit node for Par and determine if
4698 -- its context clauses contain a limited with for Pack.
4700 Par_Unit
:= Parent
(Parent
(Parent
(Par
)));
4702 if Nkind
(Par_Unit
) = N_Package_Declaration
then
4703 Par_Unit
:= Parent
(Par_Unit
);
4706 if Has_With_Clause
(Par_Unit
, Pack
, True) then
4710 -- If there are more ancestors, climb up the tree, otherwise we
4713 if Is_Child_Unit
(Par
) then
4721 end Has_Limited_With_Clause
;
4723 ----------------------------------
4724 -- Is_Visible_Through_Renamings --
4725 ----------------------------------
4727 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean is
4728 Kind
: constant Node_Kind
:=
4729 Nkind
(Unit
(Cunit
(Current_Sem_Unit
)));
4735 -- Example of the error detected by this subprogram:
4743 -- package Ren_P renames P;
4749 -- limited with P; -- ERROR
4750 -- package R.C is ...
4752 Aux_Unit
:= Cunit
(Current_Sem_Unit
);
4755 Item
:= First
(Context_Items
(Aux_Unit
));
4756 while Present
(Item
) loop
4757 if Nkind
(Item
) = N_With_Clause
4758 and then not Limited_Present
(Item
)
4759 and then Nkind
(Unit
(Library_Unit
(Item
))) =
4760 N_Package_Declaration
4763 First
(Visible_Declarations
4764 (Specification
(Unit
(Library_Unit
(Item
)))));
4765 while Present
(Decl
) loop
4766 if Nkind
(Decl
) = N_Package_Renaming_Declaration
4767 and then Entity
(Name
(Decl
)) = P
4769 -- Generate the error message only if the current unit
4770 -- is a package declaration; in case of subprogram
4771 -- bodies and package bodies we just return True to
4772 -- indicate that the limited view must not be
4775 if Kind
= N_Package_Declaration
then
4777 ("simultaneous visibility of the limited and " &
4778 "unlimited views not allowed", N
);
4779 Error_Msg_Sloc
:= Sloc
(Item
);
4781 ("\\ unlimited view of & visible through the " &
4782 "context clause #", N
, P
);
4783 Error_Msg_Sloc
:= Sloc
(Decl
);
4784 Error_Msg_NE
("\\ and the renaming #", N
, P
);
4797 -- If it is a body not acting as spec, follow pointer to the
4798 -- corresponding spec, otherwise follow pointer to parent spec.
4800 if Present
(Library_Unit
(Aux_Unit
))
4801 and then Nkind_In
(Unit
(Aux_Unit
),
4802 N_Package_Body
, N_Subprogram_Body
)
4804 if Aux_Unit
= Library_Unit
(Aux_Unit
) then
4806 -- Aux_Unit is a body that acts as a spec. Clause has
4807 -- already been flagged as illegal.
4812 Aux_Unit
:= Library_Unit
(Aux_Unit
);
4816 Aux_Unit
:= Parent_Spec
(Unit
(Aux_Unit
));
4819 exit when No
(Aux_Unit
);
4823 end Is_Visible_Through_Renamings
;
4825 -- Start of processing for Install_Limited_Withed_Unit
4828 pragma Assert
(not Limited_View_Installed
(N
));
4830 -- In case of limited with_clause on subprograms, generics, instances,
4831 -- or renamings, the corresponding error was previously posted and we
4832 -- have nothing to do here. If the file is missing altogether, it has
4833 -- no source location.
4835 if Nkind
(P_Unit
) /= N_Package_Declaration
4836 or else Sloc
(P_Unit
) = No_Location
4841 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
4843 -- Handle child packages
4845 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
4846 Is_Child_Package
:= True;
4847 P
:= Defining_Identifier
(P
);
4850 -- Do not install the limited-view if the context of the unit is already
4851 -- available through a regular with clause.
4853 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4854 and then Has_With_Clause
(Cunit
(Current_Sem_Unit
), P
)
4859 -- Do not install the limited-view if the full-view is already visible
4860 -- through renaming declarations.
4862 if Is_Visible_Through_Renamings
(P
) then
4866 -- Do not install the limited view if this is the unit being analyzed.
4867 -- This unusual case will happen when a unit has a limited_with clause
4868 -- on one of its children. The compilation of the child forces the load
4869 -- of the parent which tries to install the limited view of the child
4870 -- again. Installing the limited view must also be disabled when
4871 -- compiling the body of the child unit.
4873 if P
= Cunit_Entity
(Current_Sem_Unit
)
4874 or else (Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4875 and then P
= Main_Unit_Entity
4876 and then Is_Ancestor_Unit
4877 (Cunit
(Main_Unit
), Cunit
(Current_Sem_Unit
)))
4882 -- This scenario is similar to the one above, the difference is that the
4883 -- compilation of sibling Par.Sib forces the load of parent Par which
4884 -- tries to install the limited view of Lim_Pack [1]. However Par.Sib
4885 -- has a with clause for Lim_Pack [2] in its body, and thus needs the
4886 -- non-limited views of all entities from Lim_Pack.
4888 -- limited with Lim_Pack; -- [1]
4889 -- package Par is ... package Lim_Pack is ...
4891 -- with Lim_Pack; -- [2]
4892 -- package Par.Sib is ... package body Par.Sib is ...
4894 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4895 -- Sem_Unit is the body of Par.Sib.
4897 if Ekind
(P
) = E_Package
4898 and then Ekind
(Main_Unit_Entity
) = E_Package
4899 and then Is_Child_Unit
(Main_Unit_Entity
)
4901 -- The body has a regular with clause
4903 and then Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4904 and then Has_With_Clause
(Cunit
(Current_Sem_Unit
), P
)
4906 -- One of the ancestors has a limited with clause
4908 and then Nkind
(Parent
(Parent
(Main_Unit_Entity
))) =
4909 N_Package_Specification
4910 and then Has_Limited_With_Clause
(Scope
(Main_Unit_Entity
), P
)
4915 -- A common use of the limited-with is to have a limited-with in the
4916 -- package spec, and a normal with in its package body. For example:
4918 -- limited with X; -- [1]
4922 -- package body A is ...
4924 -- The compilation of A's body installs the context clauses found at [2]
4925 -- and then the context clauses of its specification (found at [1]). As
4926 -- a consequence, at [1] the specification of X has been analyzed and it
4927 -- is immediately visible. According to the semantics of limited-with
4928 -- context clauses we don't install the limited view because the full
4929 -- view of X supersedes its limited view.
4931 if Analyzed
(P_Unit
)
4933 (Is_Immediately_Visible
(P
)
4934 or else (Is_Child_Package
and then Is_Visible_Lib_Unit
(P
)))
4937 -- The presence of both the limited and the analyzed nonlimited view
4938 -- may also be an error, such as an illegal context for a limited
4939 -- with_clause. In that case, do not process the context item at all.
4941 if Error_Posted
(N
) then
4945 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
then
4949 Item
:= First
(Context_Items
(Cunit
(Current_Sem_Unit
)));
4950 while Present
(Item
) loop
4951 if Nkind
(Item
) = N_With_Clause
4952 and then Comes_From_Source
(Item
)
4953 and then Entity
(Name
(Item
)) = P
4962 -- If this is a child body, assume that the nonlimited with_clause
4963 -- appears in an ancestor. Could be refined ???
4967 (Unit
(Library_Unit
(Cunit
(Current_Sem_Unit
)))))
4974 -- If in package declaration, nonlimited view brought in from
4975 -- parent unit or some error condition.
4981 if Debug_Flag_I
then
4982 Write_Str
("install limited view of ");
4983 Write_Name
(Chars
(P
));
4987 -- If the unit has not been analyzed and the limited view has not been
4988 -- already installed then we install it.
4990 if not Analyzed
(P_Unit
) then
4991 if not In_Chain
(P
) then
4993 -- Minimum decoration
4995 Set_Ekind
(P
, E_Package
);
4996 Set_Etype
(P
, Standard_Void_Type
);
4997 Set_Scope
(P
, Standard_Standard
);
4998 Set_Is_Visible_Lib_Unit
(P
);
5000 if Is_Child_Package
then
5001 Set_Is_Child_Unit
(P
);
5002 Set_Scope
(P
, Defining_Entity
(Unit
(Parent_Spec
(P_Unit
))));
5005 -- Place entity on visibility structure
5007 Set_Homonym
(P
, Current_Entity
(P
));
5008 Set_Current_Entity
(P
);
5010 if Debug_Flag_I
then
5011 Write_Str
(" (homonym) chain ");
5012 Write_Name
(Chars
(P
));
5016 -- Install the incomplete view. The first element of the limited
5017 -- view is a header (an E_Package entity) used to reference the
5018 -- first shadow entity in the private part of the package.
5020 Lim_Header
:= Limited_View
(P
);
5021 Lim_Typ
:= First_Entity
(Lim_Header
);
5023 while Present
(Lim_Typ
)
5024 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
5026 Set_Homonym
(Lim_Typ
, Current_Entity
(Lim_Typ
));
5027 Set_Current_Entity
(Lim_Typ
);
5029 if Debug_Flag_I
then
5030 Write_Str
(" (homonym) chain ");
5031 Write_Name
(Chars
(Lim_Typ
));
5035 Next_Entity
(Lim_Typ
);
5039 -- If the unit appears in a previous regular with_clause, the regular
5040 -- entities of the public part of the withed package must be replaced
5041 -- by the shadow ones.
5043 -- This code must be kept synchronized with the code that replaces the
5044 -- shadow entities by the real entities (see body of Remove_Limited
5045 -- With_Clause); otherwise the contents of the homonym chains are not
5049 -- Hide all the type entities of the public part of the package to
5050 -- avoid its usage. This is needed to cover all the subtype decla-
5051 -- rations because we do not remove them from the homonym chain.
5053 E
:= First_Entity
(P
);
5054 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
5056 Set_Was_Hidden
(E
, Is_Hidden
(E
));
5063 -- Replace the real entities by the shadow entities of the limited
5064 -- view. The first element of the limited view is a header that is
5065 -- used to reference the first shadow entity in the private part
5066 -- of the package. Successive elements are the limited views of the
5067 -- type (including regular incomplete types) declared in the package.
5069 Lim_Header
:= Limited_View
(P
);
5071 Lim_Typ
:= First_Entity
(Lim_Header
);
5072 while Present
(Lim_Typ
)
5073 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
5075 pragma Assert
(not In_Chain
(Lim_Typ
));
5077 -- Do not unchain nested packages and child units
5079 if Ekind
(Lim_Typ
) /= E_Package
5080 and then not Is_Child_Unit
(Lim_Typ
)
5086 Prev
:= Current_Entity
(Lim_Typ
);
5089 -- Replace E in the homonyms list, so that the limited view
5090 -- becomes available.
5092 -- If the non-limited view is a record with an anonymous
5093 -- self-referential component, the analysis of the record
5094 -- declaration creates an incomplete type with the same name
5095 -- in order to define an internal access type. The visible
5096 -- entity is now the incomplete type, and that is the one to
5097 -- replace in the visibility structure.
5099 if E
= Non_Limited_View
(Lim_Typ
)
5101 (Ekind
(E
) = E_Incomplete_Type
5102 and then Full_View
(E
) = Non_Limited_View
(Lim_Typ
))
5104 Set_Homonym
(Lim_Typ
, Homonym
(Prev
));
5105 Set_Current_Entity
(Lim_Typ
);
5109 E
:= Homonym
(Prev
);
5111 -- E may have been removed when installing a previous
5112 -- limited_with_clause.
5115 exit when E
= Non_Limited_View
(Lim_Typ
);
5116 Prev
:= Homonym
(Prev
);
5120 Set_Homonym
(Lim_Typ
, Homonym
(Homonym
(Prev
)));
5121 Set_Homonym
(Prev
, Lim_Typ
);
5126 if Debug_Flag_I
then
5127 Write_Str
(" (homonym) chain ");
5128 Write_Name
(Chars
(Lim_Typ
));
5133 Next_Entity
(Lim_Typ
);
5137 -- The package must be visible while the limited-with clause is active
5138 -- because references to the type P.T must resolve in the usual way.
5139 -- In addition, we remember that the limited-view has been installed to
5140 -- uninstall it at the point of context removal.
5142 Set_Is_Immediately_Visible
(P
);
5143 Set_Limited_View_Installed
(N
);
5145 -- If unit has not been analyzed in some previous context, check
5146 -- (imperfectly ???) whether it might need a body.
5148 if not Analyzed
(P_Unit
) then
5149 Check_Body_Required
;
5152 -- If the package in the limited_with clause is a child unit, the clause
5153 -- is unanalyzed and appears as a selected component. Recast it as an
5154 -- expanded name so that the entity can be properly set. Use entity of
5155 -- parent, if available, for higher ancestors in the name.
5157 if Nkind
(Name
(N
)) = N_Selected_Component
then
5165 while Nkind
(Nam
) = N_Selected_Component
5166 and then Present
(Ent
)
5168 Change_Selected_Component_To_Expanded_Name
(Nam
);
5170 -- Set entity of parent identifiers if the unit is a child
5171 -- unit. This ensures that the tree is properly formed from
5172 -- semantic point of view (e.g. for ASIS queries). The unit
5173 -- entities are not fully analyzed, so we need to follow unit
5174 -- links in the tree.
5176 Set_Entity
(Nam
, Ent
);
5178 Nam
:= Prefix
(Nam
);
5181 (Unit
(Parent_Spec
(Unit_Declaration_Node
(Ent
))));
5183 -- Set entity of last ancestor
5185 if Nkind
(Nam
) = N_Identifier
then
5186 Set_Entity
(Nam
, Ent
);
5192 Set_Entity
(Name
(N
), P
);
5193 Set_From_Limited_With
(P
);
5194 end Install_Limited_Withed_Unit
;
5196 -------------------------
5197 -- Install_Withed_Unit --
5198 -------------------------
5200 procedure Install_Withed_Unit
5201 (With_Clause
: Node_Id
;
5202 Private_With_OK
: Boolean := False)
5204 Uname
: constant Entity_Id
:= Entity
(Name
(With_Clause
));
5205 P
: constant Entity_Id
:= Scope
(Uname
);
5208 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
5209 -- compiling a package declaration and the Private_With_OK flag was not
5210 -- set by the caller. These declarations will be installed later (before
5211 -- analyzing the private part of the package).
5213 if Private_Present
(With_Clause
)
5214 and then Nkind
(Unit
(Parent
(With_Clause
))) = N_Package_Declaration
5215 and then not (Private_With_OK
)
5220 if Debug_Flag_I
then
5221 if Private_Present
(With_Clause
) then
5222 Write_Str
("install private withed unit ");
5224 Write_Str
("install withed unit ");
5227 Write_Name
(Chars
(Uname
));
5231 -- We do not apply the restrictions to an internal unit unless we are
5232 -- compiling the internal unit as a main unit. This check is also
5233 -- skipped for dummy units (for missing packages).
5235 if Sloc
(Uname
) /= No_Location
5236 and then (not Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
))
5237 or else Current_Sem_Unit
= Main_Unit
)
5239 Check_Restricted_Unit
5240 (Unit_Name
(Get_Source_Unit
(Uname
)), With_Clause
);
5243 if P
/= Standard_Standard
then
5245 -- If the unit is not analyzed after analysis of the with clause and
5246 -- it is an instantiation then it awaits a body and is the main unit.
5247 -- Its appearance in the context of some other unit indicates a
5248 -- circular dependency (DEC suite perversity).
5250 if not Analyzed
(Uname
)
5251 and then Nkind
(Parent
(Uname
)) = N_Package_Instantiation
5254 ("instantiation depends on itself", Name
(With_Clause
));
5256 elsif not Is_Visible_Lib_Unit
(Uname
) then
5258 -- Abandon processing in case of previous errors
5260 if No
(Scope
(Uname
)) then
5261 Check_Error_Detected
;
5265 Set_Is_Visible_Lib_Unit
(Uname
);
5267 -- If the unit is a wrapper package for a compilation unit that is
5268 -- a subprogrm instance, indicate that the instance itself is a
5269 -- visible unit. This is necessary if the instance is inlined.
5271 if Is_Wrapper_Package
(Uname
) then
5272 Set_Is_Visible_Lib_Unit
(Related_Instance
(Uname
));
5275 -- If the child unit appears in the context of its parent, it is
5276 -- immediately visible.
5278 if In_Open_Scopes
(Scope
(Uname
)) then
5279 Set_Is_Immediately_Visible
(Uname
);
5282 if Is_Generic_Instance
(Uname
)
5283 and then Ekind
(Uname
) in Subprogram_Kind
5285 -- Set flag as well on the visible entity that denotes the
5286 -- instance, which renames the current one.
5288 Set_Is_Visible_Lib_Unit
5290 (Defining_Entity
(Unit
(Library_Unit
(With_Clause
)))));
5293 -- The parent unit may have been installed already, and may have
5294 -- appeared in a use clause.
5296 if In_Use
(Scope
(Uname
)) then
5297 Set_Is_Potentially_Use_Visible
(Uname
);
5300 Set_Context_Installed
(With_Clause
);
5303 elsif not Is_Immediately_Visible
(Uname
) then
5304 Set_Is_Visible_Lib_Unit
(Uname
);
5306 if not Private_Present
(With_Clause
) or else Private_With_OK
then
5307 Set_Is_Immediately_Visible
(Uname
);
5310 Set_Context_Installed
(With_Clause
);
5313 -- A with-clause overrides a with-type clause: there are no restric-
5314 -- tions on the use of package entities.
5316 if Ekind
(Uname
) = E_Package
then
5317 Set_From_Limited_With
(Uname
, False);
5320 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
5321 -- unit if there is a visible homograph for it declared in the same
5322 -- declarative region. This pathological case can only arise when an
5323 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
5324 -- G1 has a generic child also named G2, and the context includes with_
5325 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
5326 -- of I1.G2 visible as well. If the child unit is named Standard, do
5327 -- not apply the check to the Standard package itself.
5329 if Is_Child_Unit
(Uname
)
5330 and then Is_Visible_Lib_Unit
(Uname
)
5331 and then Ada_Version
>= Ada_2005
5334 Decl1
: constant Node_Id
:= Unit_Declaration_Node
(P
);
5340 U2
:= Homonym
(Uname
);
5341 while Present
(U2
) and then U2
/= Standard_Standard
loop
5343 Decl2
:= Unit_Declaration_Node
(P2
);
5345 if Is_Child_Unit
(U2
) and then Is_Visible_Lib_Unit
(U2
) then
5346 if Is_Generic_Instance
(P
)
5347 and then Nkind
(Decl1
) = N_Package_Declaration
5348 and then Generic_Parent
(Specification
(Decl1
)) = P2
5350 Error_Msg_N
("illegal with_clause", With_Clause
);
5352 ("\child unit has visible homograph" &
5353 " (RM 8.3(26), 10.1.1(19))",
5357 elsif Is_Generic_Instance
(P2
)
5358 and then Nkind
(Decl2
) = N_Package_Declaration
5359 and then Generic_Parent
(Specification
(Decl2
)) = P
5361 -- With_clause for child unit of instance appears before
5362 -- in the context. We want to place the error message on
5363 -- it, not on the generic child unit itself.
5366 Prev_Clause
: Node_Id
;
5369 Prev_Clause
:= First
(List_Containing
(With_Clause
));
5370 while Entity
(Name
(Prev_Clause
)) /= U2
loop
5374 pragma Assert
(Present
(Prev_Clause
));
5375 Error_Msg_N
("illegal with_clause", Prev_Clause
);
5377 ("\child unit has visible homograph" &
5378 " (RM 8.3(26), 10.1.1(19))",
5389 end Install_Withed_Unit
;
5395 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean is
5396 K
: constant Node_Kind
:= Nkind
(Lib_Unit
);
5399 return (K
in N_Generic_Declaration
or else
5400 K
in N_Generic_Instantiation
or else
5401 K
in N_Generic_Renaming_Declaration
or else
5402 K
= N_Package_Declaration
or else
5403 K
= N_Package_Renaming_Declaration
or else
5404 K
= N_Subprogram_Declaration
or else
5405 K
= N_Subprogram_Renaming_Declaration
)
5406 and then Present
(Parent_Spec
(Lib_Unit
));
5409 ------------------------------------
5410 -- Is_Legal_Shadow_Entity_In_Body --
5411 ------------------------------------
5413 function Is_Legal_Shadow_Entity_In_Body
(T
: Entity_Id
) return Boolean is
5414 C_Unit
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
5416 return Nkind
(Unit
(C_Unit
)) = N_Package_Body
5419 (C_Unit
, Cunit_Entity
(Get_Source_Unit
(Non_Limited_View
(T
))));
5420 end Is_Legal_Shadow_Entity_In_Body
;
5422 ----------------------
5423 -- Is_Ancestor_Unit --
5424 ----------------------
5426 function Is_Ancestor_Unit
(U1
: Node_Id
; U2
: Node_Id
) return Boolean is
5427 E1
: constant Entity_Id
:= Defining_Entity
(Unit
(U1
));
5430 if Nkind_In
(Unit
(U2
), N_Package_Body
, N_Subprogram_Body
) then
5431 E2
:= Defining_Entity
(Unit
(Library_Unit
(U2
)));
5432 return Is_Ancestor_Package
(E1
, E2
);
5436 end Is_Ancestor_Unit
;
5438 -----------------------
5439 -- Load_Needed_Body --
5440 -----------------------
5442 -- N is a generic unit named in a with clause, or else it is a unit that
5443 -- contains a generic unit or an inlined function. In order to perform an
5444 -- instantiation, the body of the unit must be present. If the unit itself
5445 -- is generic, we assume that an instantiation follows, and load & analyze
5446 -- the body unconditionally. This forces analysis of the spec as well.
5448 -- If the unit is not generic, but contains a generic unit, it is loaded on
5449 -- demand, at the point of instantiation (see ch12).
5451 procedure Load_Needed_Body
5454 Do_Analyze
: Boolean := True)
5456 Body_Name
: Unit_Name_Type
;
5457 Unum
: Unit_Number_Type
;
5459 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
5460 -- The loading and analysis is done with style checks off
5463 if not GNAT_Mode
then
5464 Style_Check
:= False;
5467 Body_Name
:= Get_Body_Name
(Get_Unit_Name
(Unit
(N
)));
5470 (Load_Name
=> Body_Name
,
5476 if Unum
= No_Unit
then
5480 Compiler_State
:= Analyzing
; -- reset after load
5482 if Fatal_Error
(Unum
) /= Error_Detected
or else Try_Semantics
then
5483 if Debug_Flag_L
then
5484 Write_Str
("*** Loaded generic body");
5489 Semantics
(Cunit
(Unum
));
5496 Style_Check
:= Save_Style_Check
;
5497 end Load_Needed_Body
;
5499 -------------------------
5500 -- Build_Limited_Views --
5501 -------------------------
5503 procedure Build_Limited_Views
(N
: Node_Id
) is
5504 Unum
: constant Unit_Number_Type
:=
5505 Get_Source_Unit
(Library_Unit
(N
));
5506 Is_Analyzed
: constant Boolean := Analyzed
(Cunit
(Unum
));
5508 Shadow_Pack
: Entity_Id
;
5509 -- The corresponding shadow entity of the withed package. This entity
5510 -- offers incomplete views of packages and types as well as abstract
5511 -- views of states and variables declared within.
5513 Last_Shadow
: Entity_Id
:= Empty
;
5514 -- The last shadow entity created by routine Build_Shadow_Entity
5516 procedure Build_Shadow_Entity
5519 Shadow
: out Entity_Id
;
5520 Is_Tagged
: Boolean := False);
5521 -- Create a shadow entity that hides Ent and offers an abstract or
5522 -- incomplete view of Ent. Scop is the proper scope. Flag Is_Tagged
5523 -- should be set when Ent is a tagged type. The generated entity is
5524 -- added to Lim_Header. This routine updates the value of Last_Shadow.
5526 procedure Decorate_Package
(Ent
: Entity_Id
; Scop
: Entity_Id
);
5527 -- Perform minimal decoration of a package or its corresponding shadow
5528 -- entity denoted by Ent. Scop is the proper scope.
5530 procedure Decorate_State
(Ent
: Entity_Id
; Scop
: Entity_Id
);
5531 -- Perform full decoration of an abstract state or its corresponding
5532 -- shadow entity denoted by Ent. Scop is the proper scope.
5534 procedure Decorate_Type
5537 Is_Tagged
: Boolean := False;
5538 Materialize
: Boolean := False);
5539 -- Perform minimal decoration of a type or its corresponding shadow
5540 -- entity denoted by Ent. Scop is the proper scope. Flag Is_Tagged
5541 -- should be set when Ent is a tagged type. Flag Materialize should be
5542 -- set when Ent is a tagged type and its class-wide type needs to appear
5545 procedure Decorate_Variable
(Ent
: Entity_Id
; Scop
: Entity_Id
);
5546 -- Perform minimal decoration of a variable denoted by Ent. Scop is the
5549 procedure Process_Declarations_And_States
5553 Create_Abstract_Views
: Boolean);
5554 -- Inspect the states of package Pack and declarative list Decls. Create
5555 -- shadow entities for all nested packages, states, types and variables
5556 -- encountered. Scop is the proper scope. Create_Abstract_Views should
5557 -- be set when the abstract states and variables need to be processed.
5559 -------------------------
5560 -- Build_Shadow_Entity --
5561 -------------------------
5563 procedure Build_Shadow_Entity
5566 Shadow
: out Entity_Id
;
5567 Is_Tagged
: Boolean := False)
5570 Shadow
:= Make_Temporary
(Sloc
(Ent
), 'Z');
5572 -- The shadow entity must share the same name and parent as the
5575 Set_Chars
(Shadow
, Chars
(Ent
));
5576 Set_Parent
(Shadow
, Parent
(Ent
));
5578 -- The abstract view of a variable is a state, not another variable
5580 if Ekind
(Ent
) = E_Variable
then
5581 Set_Ekind
(Shadow
, E_Abstract_State
);
5583 Set_Ekind
(Shadow
, Ekind
(Ent
));
5586 Set_Is_Internal
(Shadow
);
5587 Set_From_Limited_With
(Shadow
);
5589 -- Add the new shadow entity to the limited view of the package
5591 Last_Shadow
:= Shadow
;
5592 Append_Entity
(Shadow
, Shadow_Pack
);
5594 -- Perform context-specific decoration of the shadow entity
5596 if Ekind
(Ent
) = E_Abstract_State
then
5597 Decorate_State
(Shadow
, Scop
);
5598 Set_Non_Limited_View
(Shadow
, Ent
);
5600 elsif Ekind
(Ent
) = E_Package
then
5601 Decorate_Package
(Shadow
, Scop
);
5603 elsif Is_Type
(Ent
) then
5604 Decorate_Type
(Shadow
, Scop
, Is_Tagged
);
5605 Set_Non_Limited_View
(Shadow
, Ent
);
5607 if Is_Incomplete_Or_Private_Type
(Ent
) then
5608 Set_Private_Dependents
(Shadow
, New_Elmt_List
);
5611 elsif Ekind
(Ent
) = E_Variable
then
5612 Decorate_State
(Shadow
, Scop
);
5613 Set_Non_Limited_View
(Shadow
, Ent
);
5615 end Build_Shadow_Entity
;
5617 ----------------------
5618 -- Decorate_Package --
5619 ----------------------
5621 procedure Decorate_Package
(Ent
: Entity_Id
; Scop
: Entity_Id
) is
5623 Set_Ekind
(Ent
, E_Package
);
5624 Set_Etype
(Ent
, Standard_Void_Type
);
5625 Set_Scope
(Ent
, Scop
);
5626 end Decorate_Package
;
5628 --------------------
5629 -- Decorate_State --
5630 --------------------
5632 procedure Decorate_State
(Ent
: Entity_Id
; Scop
: Entity_Id
) is
5634 Set_Ekind
(Ent
, E_Abstract_State
);
5635 Set_Etype
(Ent
, Standard_Void_Type
);
5636 Set_Scope
(Ent
, Scop
);
5637 Set_Encapsulating_State
(Ent
, Empty
);
5638 Set_Refinement_Constituents
(Ent
, New_Elmt_List
);
5639 Set_Part_Of_Constituents
(Ent
, New_Elmt_List
);
5646 procedure Decorate_Type
5649 Is_Tagged
: Boolean := False;
5650 Materialize
: Boolean := False)
5655 -- An unanalyzed type or a shadow entity of a type is treated as an
5658 Set_Ekind
(Ent
, E_Incomplete_Type
);
5659 Set_Etype
(Ent
, Ent
);
5660 Set_Scope
(Ent
, Scop
);
5661 Set_Is_First_Subtype
(Ent
);
5662 Set_Stored_Constraint
(Ent
, No_Elist
);
5663 Set_Full_View
(Ent
, Empty
);
5664 Init_Size_Align
(Ent
);
5666 -- A tagged type and its corresponding shadow entity share one common
5667 -- class-wide type. The list of primitive operations for the shadow
5671 Set_Is_Tagged_Type
(Ent
);
5672 Set_Direct_Primitive_Operations
(Ent
, New_Elmt_List
);
5674 if No
(Class_Wide_Type
(Ent
)) then
5677 (E_Void
, Scope
(Ent
), Sloc
(Ent
), Ent
, 'C', 0, 'T');
5679 Set_Class_Wide_Type
(Ent
, CW_Typ
);
5681 -- Set parent to be the same as the parent of the tagged type.
5682 -- We need a parent field set, and it is supposed to point to
5683 -- the declaration of the type. The tagged type declaration
5684 -- essentially declares two separate types, the tagged type
5685 -- itself and the corresponding class-wide type, so it is
5686 -- reasonable for the parent fields to point to the declaration
5689 Set_Parent
(CW_Typ
, Parent
(Ent
));
5691 Set_Ekind
(CW_Typ
, E_Class_Wide_Type
);
5692 Set_Etype
(CW_Typ
, Ent
);
5693 Set_Scope
(CW_Typ
, Scop
);
5694 Set_Is_Tagged_Type
(CW_Typ
);
5695 Set_Is_First_Subtype
(CW_Typ
);
5696 Init_Size_Align
(CW_Typ
);
5697 Set_Has_Unknown_Discriminants
(CW_Typ
);
5698 Set_Class_Wide_Type
(CW_Typ
, CW_Typ
);
5699 Set_Equivalent_Type
(CW_Typ
, Empty
);
5700 Set_From_Limited_With
(CW_Typ
, From_Limited_With
(Ent
));
5701 Set_Materialize_Entity
(CW_Typ
, Materialize
);
5706 -----------------------
5707 -- Decorate_Variable --
5708 -----------------------
5710 procedure Decorate_Variable
(Ent
: Entity_Id
; Scop
: Entity_Id
) is
5712 Set_Ekind
(Ent
, E_Variable
);
5713 Set_Etype
(Ent
, Standard_Void_Type
);
5714 Set_Scope
(Ent
, Scop
);
5715 end Decorate_Variable
;
5717 -------------------------------------
5718 -- Process_Declarations_And_States --
5719 -------------------------------------
5721 procedure Process_Declarations_And_States
5725 Create_Abstract_Views
: Boolean)
5727 procedure Find_And_Process_States
;
5728 -- Determine whether package Pack defines abstract state either by
5729 -- using an aspect or a pragma. If this is the case, build shadow
5730 -- entities for all abstract states of Pack.
5732 procedure Process_States
(States
: Elist_Id
);
5733 -- Generate shadow entities for all abstract states in list States
5735 -----------------------------
5736 -- Find_And_Process_States --
5737 -----------------------------
5739 procedure Find_And_Process_States
is
5740 procedure Process_State
(State
: Node_Id
);
5741 -- Generate shadow entities for a single abstract state or
5742 -- multiple states expressed as an aggregate.
5748 procedure Process_State
(State
: Node_Id
) is
5749 Loc
: constant Source_Ptr
:= Sloc
(State
);
5756 -- Multiple abstract states appear as an aggregate
5758 if Nkind
(State
) = N_Aggregate
then
5759 Elmt
:= First
(Expressions
(State
));
5760 while Present
(Elmt
) loop
5761 Process_State
(Elmt
);
5767 -- A null state has no abstract view
5769 elsif Nkind
(State
) = N_Null
then
5772 -- State declaration with various options appears as an
5773 -- extension aggregate.
5775 elsif Nkind
(State
) = N_Extension_Aggregate
then
5776 Decl
:= Ancestor_Part
(State
);
5778 -- Simple state declaration
5780 elsif Nkind
(State
) = N_Identifier
then
5783 -- Possibly an illegal state declaration
5789 -- Abstract states are elaborated when the related pragma is
5790 -- elaborated. Since the withed package is not analyzed yet,
5791 -- the entities of the abstract states are not available. To
5792 -- overcome this complication, create the entities now and
5793 -- store them in their respective declarations. The entities
5794 -- are later used by routine Create_Abstract_State to declare
5795 -- and enter the states into visibility.
5797 if No
(Entity
(Decl
)) then
5798 Id
:= Make_Defining_Identifier
(Loc
, Chars
(Decl
));
5800 Set_Entity
(Decl
, Id
);
5801 Set_Parent
(Id
, State
);
5802 Decorate_State
(Id
, Scop
);
5804 -- Otherwise the package was previously withed
5807 Id
:= Entity
(Decl
);
5810 Build_Shadow_Entity
(Id
, Scop
, Dummy
);
5815 Pack_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Pack
);
5819 -- Start of processing for Find_And_Process_States
5822 -- Find aspect Abstract_State
5824 Asp
:= First
(Aspect_Specifications
(Pack_Decl
));
5825 while Present
(Asp
) loop
5826 if Chars
(Identifier
(Asp
)) = Name_Abstract_State
then
5827 Process_State
(Expression
(Asp
));
5835 -- Find pragma Abstract_State by inspecting the declarations
5837 Decl
:= First
(Decls
);
5838 while Present
(Decl
) and then Nkind
(Decl
) = N_Pragma
loop
5839 if Pragma_Name
(Decl
) = Name_Abstract_State
then
5842 (First
(Pragma_Argument_Associations
(Decl
))));
5849 end Find_And_Process_States
;
5851 --------------------
5852 -- Process_States --
5853 --------------------
5855 procedure Process_States
(States
: Elist_Id
) is
5860 Elmt
:= First_Elmt
(States
);
5861 while Present
(Elmt
) loop
5862 Build_Shadow_Entity
(Node
(Elmt
), Scop
, Dummy
);
5870 Is_Tagged
: Boolean;
5876 -- Start of processing for Process_Declarations_And_States
5879 -- Build abstract views for all states defined in the package
5881 if Create_Abstract_Views
then
5883 -- When a package has been analyzed, all states are stored in list
5884 -- Abstract_States. Generate the shadow entities directly.
5887 if Present
(Abstract_States
(Pack
)) then
5888 Process_States
(Abstract_States
(Pack
));
5891 -- The package may declare abstract states by using an aspect or a
5892 -- pragma. Attempt to locate one of these construct and if found,
5893 -- build the shadow entities.
5896 Find_And_Process_States
;
5900 -- Inspect the declarative list, looking for nested packages, types
5901 -- and variable declarations.
5903 Decl
:= First
(Decls
);
5904 while Present
(Decl
) loop
5908 if Nkind
(Decl
) = N_Package_Declaration
then
5909 Def_Id
:= Defining_Entity
(Decl
);
5911 -- Perform minor decoration when the withed package has not
5914 if not Is_Analyzed
then
5915 Decorate_Package
(Def_Id
, Scop
);
5918 -- Create a shadow entity that offers a limited view of all
5919 -- visible types declared within.
5921 Build_Shadow_Entity
(Def_Id
, Scop
, Shadow
);
5923 Process_Declarations_And_States
5925 Decls
=> Visible_Declarations
(Specification
(Decl
)),
5927 Create_Abstract_Views
=> Create_Abstract_Views
);
5931 elsif Nkind_In
(Decl
, N_Full_Type_Declaration
,
5932 N_Incomplete_Type_Declaration
,
5933 N_Private_Extension_Declaration
,
5934 N_Private_Type_Declaration
,
5935 N_Protected_Type_Declaration
,
5936 N_Task_Type_Declaration
)
5938 Def_Id
:= Defining_Entity
(Decl
);
5940 -- Determine whether the type is tagged. Note that packages
5941 -- included via a limited with clause are not always analyzed,
5942 -- hence the tree lookup rather than the use of attribute
5945 if Nkind
(Decl
) = N_Full_Type_Declaration
then
5946 Def
:= Type_Definition
(Decl
);
5949 (Nkind
(Def
) = N_Record_Definition
5950 and then Tagged_Present
(Def
))
5952 (Nkind
(Def
) = N_Derived_Type_Definition
5953 and then Present
(Record_Extension_Part
(Def
)));
5955 elsif Nkind_In
(Decl
, N_Incomplete_Type_Declaration
,
5956 N_Private_Type_Declaration
)
5958 Is_Tagged
:= Tagged_Present
(Decl
);
5960 elsif Nkind
(Decl
) = N_Private_Extension_Declaration
then
5967 -- Perform minor decoration when the withed package has not
5970 if not Is_Analyzed
then
5971 Decorate_Type
(Def_Id
, Scop
, Is_Tagged
, True);
5974 -- Create a shadow entity that hides the type and offers an
5975 -- incomplete view of the said type.
5977 Build_Shadow_Entity
(Def_Id
, Scop
, Shadow
, Is_Tagged
);
5981 elsif Create_Abstract_Views
5982 and then Nkind
(Decl
) = N_Object_Declaration
5983 and then not Constant_Present
(Decl
)
5985 Def_Id
:= Defining_Entity
(Decl
);
5987 -- Perform minor decoration when the withed package has not
5990 if not Is_Analyzed
then
5991 Decorate_Variable
(Def_Id
, Scop
);
5994 -- Create a shadow entity that hides the variable and offers an
5995 -- abstract view of the said variable.
5997 Build_Shadow_Entity
(Def_Id
, Scop
, Shadow
);
6002 end Process_Declarations_And_States
;
6006 Nam
: constant Node_Id
:= Name
(N
);
6007 Pack
: constant Entity_Id
:= Cunit_Entity
(Unum
);
6009 Last_Public_Shadow
: Entity_Id
:= Empty
;
6010 Private_Shadow
: Entity_Id
;
6013 -- Start of processing for Build_Limited_Views
6016 pragma Assert
(Limited_Present
(N
));
6018 -- A library_item mentioned in a limited_with_clause is a package
6019 -- declaration, not a subprogram declaration, generic declaration,
6020 -- generic instantiation, or package renaming declaration.
6022 case Nkind
(Unit
(Library_Unit
(N
))) is
6023 when N_Package_Declaration
=>
6026 when N_Subprogram_Declaration
=>
6027 Error_Msg_N
("subprograms not allowed in limited with_clauses", N
);
6030 when N_Generic_Package_Declaration |
6031 N_Generic_Subprogram_Declaration
=>
6032 Error_Msg_N
("generics not allowed in limited with_clauses", N
);
6035 when N_Generic_Instantiation
=>
6037 ("generic instantiations not allowed in limited with_clauses",
6041 when N_Generic_Renaming_Declaration
=>
6043 ("generic renamings not allowed in limited with_clauses", N
);
6046 when N_Subprogram_Renaming_Declaration
=>
6048 ("renamed subprograms not allowed in limited with_clauses", N
);
6051 when N_Package_Renaming_Declaration
=>
6053 ("renamed packages not allowed in limited with_clauses", N
);
6057 raise Program_Error
;
6060 -- The withed unit may not be analyzed, but the with calause itself
6061 -- must be minimally decorated. This ensures that the checks on unused
6062 -- with clauses also process limieted withs.
6064 Set_Ekind
(Pack
, E_Package
);
6065 Set_Etype
(Pack
, Standard_Void_Type
);
6067 if Is_Entity_Name
(Nam
) then
6068 Set_Entity
(Nam
, Pack
);
6070 elsif Nkind
(Nam
) = N_Selected_Component
then
6071 Set_Entity
(Selector_Name
(Nam
), Pack
);
6074 -- Check if the chain is already built
6076 Spec
:= Specification
(Unit
(Library_Unit
(N
)));
6078 if Limited_View_Installed
(Spec
) then
6082 -- Create the shadow package wich hides the withed unit and provides
6083 -- incomplete view of all types and packages declared within.
6085 Shadow_Pack
:= Make_Temporary
(Sloc
(N
), 'Z');
6086 Set_Ekind
(Shadow_Pack
, E_Package
);
6087 Set_Is_Internal
(Shadow_Pack
);
6088 Set_Limited_View
(Pack
, Shadow_Pack
);
6090 -- Inspect the abstract states and visible declarations of the withed
6091 -- unit and create shadow entities that hide existing packages, states,
6092 -- variables and types.
6094 Process_Declarations_And_States
6096 Decls
=> Visible_Declarations
(Spec
),
6098 Create_Abstract_Views
=> True);
6100 Last_Public_Shadow
:= Last_Shadow
;
6102 -- Ada 2005 (AI-262): Build the limited view of the private declarations
6103 -- to accomodate limited private with clauses.
6105 Process_Declarations_And_States
6107 Decls
=> Private_Declarations
(Spec
),
6109 Create_Abstract_Views
=> False);
6111 if Present
(Last_Public_Shadow
) then
6112 Private_Shadow
:= Next_Entity
(Last_Public_Shadow
);
6114 Private_Shadow
:= First_Entity
(Shadow_Pack
);
6117 Set_First_Private_Entity
(Shadow_Pack
, Private_Shadow
);
6118 Set_Limited_View_Installed
(Spec
);
6119 end Build_Limited_Views
;
6121 ----------------------------
6122 -- Check_No_Elab_Code_All --
6123 ----------------------------
6125 procedure Check_No_Elab_Code_All
(N
: Node_Id
) is
6127 if Present
(No_Elab_Code_All_Pragma
)
6128 and then In_Extended_Main_Source_Unit
(N
)
6129 and then Present
(Context_Items
(N
))
6132 CL
: constant List_Id
:= Context_Items
(N
);
6137 while Present
(CI
) loop
6138 if Nkind
(CI
) = N_With_Clause
6140 No_Elab_Code_All
(Get_Source_Unit
(Library_Unit
(CI
)))
6142 Error_Msg_Sloc
:= Sloc
(No_Elab_Code_All_Pragma
);
6144 ("violation of No_Elaboration_Code_All#", CI
);
6146 ("\unit& does not have No_Elaboration_Code_All",
6147 CI
, Entity
(Name
(CI
)));
6154 end Check_No_Elab_Code_All
;
6156 -------------------------------
6157 -- Check_Body_Needed_For_SAL --
6158 -------------------------------
6160 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
) is
6162 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean;
6163 -- Determine whether use of entity E might require the presence of its
6164 -- body. For a package this requires a recursive traversal of all nested
6167 ---------------------------
6168 -- Entity_Needed_For_SAL --
6169 ---------------------------
6171 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean is
6175 if Is_Subprogram
(E
) and then Has_Pragma_Inline
(E
) then
6178 elsif Ekind_In
(E
, E_Generic_Function
, E_Generic_Procedure
) then
6181 elsif Ekind
(E
) = E_Generic_Package
6183 Nkind
(Unit_Declaration_Node
(E
)) = N_Generic_Package_Declaration
6184 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
6188 elsif Ekind
(E
) = E_Package
6189 and then Nkind
(Unit_Declaration_Node
(E
)) = N_Package_Declaration
6190 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
6192 Ent
:= First_Entity
(E
);
6193 while Present
(Ent
) loop
6194 if Entity_Needs_Body
(Ent
) then
6206 end Entity_Needs_Body
;
6208 -- Start of processing for Check_Body_Needed_For_SAL
6211 if Ekind
(Unit_Name
) = E_Generic_Package
6212 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
6213 N_Generic_Package_Declaration
6215 Present
(Corresponding_Body
(Unit_Declaration_Node
(Unit_Name
)))
6217 Set_Body_Needed_For_SAL
(Unit_Name
);
6219 elsif Ekind_In
(Unit_Name
, E_Generic_Procedure
, E_Generic_Function
) then
6220 Set_Body_Needed_For_SAL
(Unit_Name
);
6222 elsif Is_Subprogram
(Unit_Name
)
6223 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
6224 N_Subprogram_Declaration
6225 and then Has_Pragma_Inline
(Unit_Name
)
6227 Set_Body_Needed_For_SAL
(Unit_Name
);
6229 elsif Ekind
(Unit_Name
) = E_Subprogram_Body
then
6230 Check_Body_Needed_For_SAL
6231 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
6233 elsif Ekind
(Unit_Name
) = E_Package
6234 and then Entity_Needs_Body
(Unit_Name
)
6236 Set_Body_Needed_For_SAL
(Unit_Name
);
6238 elsif Ekind
(Unit_Name
) = E_Package_Body
6239 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) = N_Package_Body
6241 Check_Body_Needed_For_SAL
6242 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
6244 end Check_Body_Needed_For_SAL
;
6246 --------------------
6247 -- Remove_Context --
6248 --------------------
6250 procedure Remove_Context
(N
: Node_Id
) is
6251 Lib_Unit
: constant Node_Id
:= Unit
(N
);
6254 -- If this is a child unit, first remove the parent units
6256 if Is_Child_Spec
(Lib_Unit
) then
6257 Remove_Parents
(Lib_Unit
);
6260 Remove_Context_Clauses
(N
);
6263 ----------------------------
6264 -- Remove_Context_Clauses --
6265 ----------------------------
6267 procedure Remove_Context_Clauses
(N
: Node_Id
) is
6269 Unit_Name
: Entity_Id
;
6272 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
6273 -- limited-views first and regular-views later (to maintain the
6276 -- First Phase: Remove limited_with context clauses
6278 Item
:= First
(Context_Items
(N
));
6279 while Present
(Item
) loop
6281 -- We are interested only in with clauses which got installed
6284 if Nkind
(Item
) = N_With_Clause
6285 and then Limited_Present
(Item
)
6286 and then Limited_View_Installed
(Item
)
6288 Remove_Limited_With_Clause
(Item
);
6294 -- Second Phase: Loop through context items and undo regular
6295 -- with_clauses and use_clauses.
6297 Item
:= First
(Context_Items
(N
));
6298 while Present
(Item
) loop
6300 -- We are interested only in with clauses which got installed on
6301 -- entry, as indicated by their Context_Installed flag set
6303 if Nkind
(Item
) = N_With_Clause
6304 and then Limited_Present
(Item
)
6305 and then Limited_View_Installed
(Item
)
6309 elsif Nkind
(Item
) = N_With_Clause
6310 and then Context_Installed
(Item
)
6312 -- Remove items from one with'ed unit
6314 Unit_Name
:= Entity
(Name
(Item
));
6315 Remove_Unit_From_Visibility
(Unit_Name
);
6316 Set_Context_Installed
(Item
, False);
6318 elsif Nkind
(Item
) = N_Use_Package_Clause
then
6319 End_Use_Package
(Item
);
6321 elsif Nkind
(Item
) = N_Use_Type_Clause
then
6322 End_Use_Type
(Item
);
6327 end Remove_Context_Clauses
;
6329 --------------------------------
6330 -- Remove_Limited_With_Clause --
6331 --------------------------------
6333 procedure Remove_Limited_With_Clause
(N
: Node_Id
) is
6334 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
6337 Lim_Header
: Entity_Id
;
6338 Lim_Typ
: Entity_Id
;
6342 pragma Assert
(Limited_View_Installed
(N
));
6344 -- In case of limited with_clause on subprograms, generics, instances,
6345 -- or renamings, the corresponding error was previously posted and we
6346 -- have nothing to do here.
6348 if Nkind
(P_Unit
) /= N_Package_Declaration
then
6352 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
6354 -- Handle child packages
6356 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
6357 P
:= Defining_Identifier
(P
);
6360 if Debug_Flag_I
then
6361 Write_Str
("remove limited view of ");
6362 Write_Name
(Chars
(P
));
6363 Write_Str
(" from visibility");
6367 -- Prepare the removal of the shadow entities from visibility. The first
6368 -- element of the limited view is a header (an E_Package entity) that is
6369 -- used to reference the first shadow entity in the private part of the
6372 Lim_Header
:= Limited_View
(P
);
6373 Lim_Typ
:= First_Entity
(Lim_Header
);
6375 -- Remove package and shadow entities from visibility if it has not
6378 if not Analyzed
(P_Unit
) then
6380 Set_Is_Immediately_Visible
(P
, False);
6382 while Present
(Lim_Typ
) loop
6384 Next_Entity
(Lim_Typ
);
6387 -- Otherwise this package has already appeared in the closure and its
6388 -- shadow entities must be replaced by its real entities. This code
6389 -- must be kept synchronized with the complementary code in Install
6390 -- Limited_Withed_Unit.
6393 -- Real entities that are type or subtype declarations were hidden
6394 -- from visibility at the point of installation of the limited-view.
6395 -- Now we recover the previous value of the hidden attribute.
6397 E
:= First_Entity
(P
);
6398 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
6400 Set_Is_Hidden
(E
, Was_Hidden
(E
));
6406 while Present
(Lim_Typ
)
6407 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
6409 -- Nested packages and child units were not unchained
6411 if Ekind
(Lim_Typ
) /= E_Package
6412 and then not Is_Child_Unit
(Non_Limited_View
(Lim_Typ
))
6414 -- If the package has incomplete types, the limited view of the
6415 -- incomplete type is in fact never visible (AI05-129) but we
6416 -- have created a shadow entity E1 for it, that points to E2,
6417 -- a non-limited incomplete type. This in turn has a full view
6418 -- E3 that is the full declaration. There is a corresponding
6419 -- shadow entity E4. When reinstalling the non-limited view,
6420 -- E2 must become the current entity and E3 must be ignored.
6422 E
:= Non_Limited_View
(Lim_Typ
);
6424 if Present
(Current_Entity
(E
))
6425 and then Ekind
(Current_Entity
(E
)) = E_Incomplete_Type
6426 and then Full_View
(Current_Entity
(E
)) = E
6429 -- Lim_Typ is the limited view of a full type declaration
6430 -- that has a previous incomplete declaration, i.e. E3 from
6431 -- the previous description. Nothing to insert.
6436 pragma Assert
(not In_Chain
(E
));
6438 Prev
:= Current_Entity
(Lim_Typ
);
6440 if Prev
= Lim_Typ
then
6441 Set_Current_Entity
(E
);
6444 while Present
(Prev
)
6445 and then Homonym
(Prev
) /= Lim_Typ
6447 Prev
:= Homonym
(Prev
);
6450 if Present
(Prev
) then
6451 Set_Homonym
(Prev
, E
);
6455 -- Preserve structure of homonym chain
6457 Set_Homonym
(E
, Homonym
(Lim_Typ
));
6461 Next_Entity
(Lim_Typ
);
6465 -- Indicate that the limited view of the package is not installed
6467 Set_From_Limited_With
(P
, False);
6468 Set_Limited_View_Installed
(N
, False);
6469 end Remove_Limited_With_Clause
;
6471 --------------------
6472 -- Remove_Parents --
6473 --------------------
6475 procedure Remove_Parents
(Lib_Unit
: Node_Id
) is
6478 P_Spec
: Node_Id
:= Empty
;
6480 Vis
: constant Boolean :=
6481 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
;
6484 if Is_Child_Spec
(Lib_Unit
) then
6485 P_Spec
:= Parent_Spec
(Lib_Unit
);
6487 elsif Nkind
(Lib_Unit
) = N_Package_Body
6488 and then Nkind
(Original_Node
(Lib_Unit
)) = N_Package_Instantiation
6490 P_Spec
:= Parent_Spec
(Original_Node
(Lib_Unit
));
6493 if Present
(P_Spec
) then
6495 P_Name
:= Get_Parent_Entity
(P
);
6496 Remove_Context_Clauses
(P_Spec
);
6497 End_Package_Scope
(P_Name
);
6498 Set_Is_Immediately_Visible
(P_Name
, Vis
);
6500 -- Remove from visibility the siblings as well, which are directly
6501 -- visible while the parent is in scope.
6503 E
:= First_Entity
(P_Name
);
6504 while Present
(E
) loop
6505 if Is_Child_Unit
(E
) then
6506 Set_Is_Immediately_Visible
(E
, False);
6512 Set_In_Package_Body
(P_Name
, False);
6514 -- This is the recursive call to remove the context of any higher
6515 -- level parent. This recursion ensures that all parents are removed
6516 -- in the reverse order of their installation.
6522 ---------------------------------
6523 -- Remove_Private_With_Clauses --
6524 ---------------------------------
6526 procedure Remove_Private_With_Clauses
(Comp_Unit
: Node_Id
) is
6529 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean;
6530 -- Check whether a given unit appears in a regular with_clause. Used to
6531 -- determine whether a private_with_clause, implicit or explicit, should
6534 ----------------------------
6535 -- In_Regular_With_Clause --
6536 ----------------------------
6538 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean
6543 Item
:= First
(Context_Items
(Comp_Unit
));
6544 while Present
(Item
) loop
6545 if Nkind
(Item
) = N_With_Clause
6547 -- The following guard is needed to ensure that the name has
6548 -- been properly analyzed before we go fetching its entity.
6550 and then Is_Entity_Name
(Name
(Item
))
6551 and then Entity
(Name
(Item
)) = E
6552 and then not Private_Present
(Item
)
6560 end In_Regular_With_Clause
;
6562 -- Start of processing for Remove_Private_With_Clauses
6565 Item
:= First
(Context_Items
(Comp_Unit
));
6566 while Present
(Item
) loop
6567 if Nkind
(Item
) = N_With_Clause
and then Private_Present
(Item
) then
6569 -- If private_with_clause is redundant, remove it from context,
6570 -- as a small optimization to subsequent handling of private_with
6571 -- clauses in other nested packages.
6573 if In_Regular_With_Clause
(Entity
(Name
(Item
))) then
6575 Nxt
: constant Node_Id
:= Next
(Item
);
6581 elsif Limited_Present
(Item
) then
6582 if not Limited_View_Installed
(Item
) then
6583 Remove_Limited_With_Clause
(Item
);
6589 Remove_Unit_From_Visibility
(Entity
(Name
(Item
)));
6590 Set_Context_Installed
(Item
, False);
6598 end Remove_Private_With_Clauses
;
6600 ---------------------------------
6601 -- Remove_Unit_From_Visibility --
6602 ---------------------------------
6604 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
) is
6606 if Debug_Flag_I
then
6607 Write_Str
("remove unit ");
6608 Write_Name
(Chars
(Unit_Name
));
6609 Write_Str
(" from visibility");
6613 Set_Is_Visible_Lib_Unit
(Unit_Name
, False);
6614 Set_Is_Potentially_Use_Visible
(Unit_Name
, False);
6615 Set_Is_Immediately_Visible
(Unit_Name
, False);
6617 -- If the unit is a wrapper package, the subprogram instance is
6618 -- what must be removed from visibility.
6619 -- Should we use Related_Instance instead???
6621 if Is_Wrapper_Package
(Unit_Name
) then
6622 Set_Is_Immediately_Visible
(Current_Entity
(Unit_Name
), False);
6624 end Remove_Unit_From_Visibility
;
6639 procedure Unchain
(E
: Entity_Id
) is
6643 Prev
:= Current_Entity
(E
);
6649 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
6652 while Present
(Prev
) and then Homonym
(Prev
) /= E
loop
6653 Prev
:= Homonym
(Prev
);
6656 if Present
(Prev
) then
6657 Set_Homonym
(Prev
, Homonym
(E
));
6661 if Debug_Flag_I
then
6662 Write_Str
(" (homonym) unchain ");
6663 Write_Name
(Chars
(E
));