1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree
; use Atree
;
27 with Debug
; use Debug
;
28 with Einfo
; use Einfo
;
29 with Errout
; use Errout
;
30 with Exp_Util
; use Exp_Util
;
31 with Elists
; use Elists
;
32 with Fname
; use Fname
;
33 with Fname
.UF
; use Fname
.UF
;
34 with Freeze
; use Freeze
;
35 with Impunit
; use Impunit
;
36 with Inline
; use Inline
;
38 with Lib
.Load
; use Lib
.Load
;
39 with Lib
.Xref
; use Lib
.Xref
;
40 with Namet
; use Namet
;
41 with Nlists
; use Nlists
;
42 with Nmake
; use Nmake
;
44 with Output
; use Output
;
45 with Par_SCO
; use Par_SCO
;
46 with Restrict
; use Restrict
;
47 with Rident
; use Rident
;
48 with Rtsfind
; use Rtsfind
;
50 with Sem_Ch3
; use Sem_Ch3
;
51 with Sem_Ch6
; use Sem_Ch6
;
52 with Sem_Ch7
; use Sem_Ch7
;
53 with Sem_Ch8
; use Sem_Ch8
;
54 with Sem_Dist
; use Sem_Dist
;
55 with Sem_Prag
; use Sem_Prag
;
56 with Sem_Util
; use Sem_Util
;
57 with Sem_Warn
; use Sem_Warn
;
58 with Stand
; use Stand
;
59 with Sinfo
; use Sinfo
;
60 with Sinfo
.CN
; use Sinfo
.CN
;
61 with Sinput
; use Sinput
;
62 with Snames
; use Snames
;
63 with Style
; use Style
;
64 with Stylesw
; use Stylesw
;
65 with Tbuild
; use Tbuild
;
66 with Uname
; use Uname
;
68 package body Sem_Ch10
is
70 -----------------------
71 -- Local Subprograms --
72 -----------------------
74 procedure Analyze_Context
(N
: Node_Id
);
75 -- Analyzes items in the context clause of compilation unit
77 procedure Build_Limited_Views
(N
: Node_Id
);
78 -- Build and decorate the list of shadow entities for a package mentioned
79 -- in a limited_with clause. If the package was not previously analyzed
80 -- then it also performs a basic decoration of the real entities. This is
81 -- required to do not pass non-decorated entities to the back-end.
82 -- Implements Ada 2005 (AI-50217).
84 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
);
85 -- Check whether the source for the body of a compilation unit must be
86 -- included in a standalone library.
88 procedure Check_Private_Child_Unit
(N
: Node_Id
);
89 -- If a with_clause mentions a private child unit, the compilation
90 -- unit must be a member of the same family, as described in 10.1.2.
92 procedure Check_Stub_Level
(N
: Node_Id
);
93 -- Verify that a stub is declared immediately within a compilation unit,
94 -- and not in an inner frame.
96 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
);
97 -- When a child unit appears in a context clause, the implicit withs on
98 -- parents are made explicit, and with clauses are inserted in the context
99 -- clause before the one for the child. If a parent in the with_clause
100 -- is a renaming, the implicit with_clause is on the renaming whose name
101 -- is mentioned in the with_clause, and not on the package it renames.
102 -- N is the compilation unit whose list of context items receives the
103 -- implicit with_clauses.
105 function Get_Parent_Entity
(Unit
: Node_Id
) return Entity_Id
;
106 -- Get defining entity of parent unit of a child unit. In most cases this
107 -- is the defining entity of the unit, but for a child instance whose
108 -- parent needs a body for inlining, the instantiation node of the parent
109 -- has not yet been rewritten as a package declaration, and the entity has
110 -- to be retrieved from the Instance_Spec of the unit.
112 function Has_With_Clause
115 Is_Limited
: Boolean := False) return Boolean;
116 -- Determine whether compilation unit C_Unit contains a [limited] with
117 -- clause for package Pack. Use the flag Is_Limited to designate desired
120 procedure Implicit_With_On_Parent
(Child_Unit
: Node_Id
; N
: Node_Id
);
121 -- If the main unit is a child unit, implicit withs are also added for
122 -- all its ancestors.
124 function In_Chain
(E
: Entity_Id
) return Boolean;
125 -- Check that the shadow entity is not already in the homonym chain, for
126 -- example through a limited_with clause in a parent unit.
128 procedure Install_Context_Clauses
(N
: Node_Id
);
129 -- Subsidiary to Install_Context and Install_Parents. Process only with_
130 -- and use_clauses for current unit and its library unit if any.
132 procedure Install_Limited_Context_Clauses
(N
: Node_Id
);
133 -- Subsidiary to Install_Context. Process only limited with_clauses for
134 -- current unit. Implements Ada 2005 (AI-50217).
136 procedure Install_Limited_Withed_Unit
(N
: Node_Id
);
137 -- Place shadow entities for a limited_with package in the visibility
138 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
140 procedure Install_Withed_Unit
141 (With_Clause
: Node_Id
;
142 Private_With_OK
: Boolean := False);
143 -- If the unit is not a child unit, make unit immediately visible. The
144 -- caller ensures that the unit is not already currently installed. The
145 -- flag Private_With_OK is set true in Install_Private_With_Clauses, which
146 -- is called when compiling the private part of a package, or installing
147 -- the private declarations of a parent unit.
149 procedure Install_Parents
(Lib_Unit
: Node_Id
; Is_Private
: Boolean);
150 -- This procedure establishes the context for the compilation of a child
151 -- unit. If Lib_Unit is a child library spec then the context of the parent
152 -- is installed, and the parent itself made immediately visible, so that
153 -- the child unit is processed in the declarative region of the parent.
154 -- Install_Parents makes a recursive call to itself to ensure that all
155 -- parents are loaded in the nested case. If Lib_Unit is a library body,
156 -- the only effect of Install_Parents is to install the private decls of
157 -- the parents, because the visible parent declarations will have been
158 -- installed as part of the context of the corresponding spec.
160 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
);
161 -- In the compilation of a child unit, a child of any of the ancestor
162 -- units is directly visible if it is visible, because the parent is in
163 -- an enclosing scope. Iterate over context to find child units of U_Name
164 -- or of some ancestor of it.
166 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean;
167 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
168 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
169 -- a library spec that has a parent. If the call to Is_Child_Spec returns
170 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
171 -- compilation unit for the parent spec.
173 -- Lib_Unit can also be a subprogram body that acts as its own spec. If the
174 -- Parent_Spec is non-empty, this is also a child unit.
176 procedure Remove_Context_Clauses
(N
: Node_Id
);
177 -- Subsidiary of previous one. Remove use_ and with_clauses
179 procedure Remove_Limited_With_Clause
(N
: Node_Id
);
180 -- Remove from visibility the shadow entities introduced for a package
181 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
183 procedure Remove_Parents
(Lib_Unit
: Node_Id
);
184 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
185 -- contexts established by the corresponding call to Install_Parents are
186 -- removed. Remove_Parents contains a recursive call to itself to ensure
187 -- that all parents are removed in the nested case.
189 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
);
190 -- Reset all visibility flags on unit after compiling it, either as a
191 -- main unit or as a unit in the context.
193 procedure Unchain
(E
: Entity_Id
);
194 -- Remove single entity from visibility list
196 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
);
197 -- Common processing for all stubs (subprograms, tasks, packages, and
198 -- protected cases). N is the stub to be analyzed. Once the subunit
199 -- name is established, load and analyze. Nam is the non-overloadable
200 -- entity for which the proper body provides a completion. Subprogram
201 -- stubs are handled differently because they can be declarations.
204 -- A dummy procedure, for debugging use, called just before analyzing the
205 -- main unit (after dealing with any context clauses).
207 --------------------------
208 -- Limited_With_Clauses --
209 --------------------------
211 -- Limited_With clauses are the mechanism chosen for Ada05 to support
212 -- mutually recursive types declared in different units. A limited_with
213 -- clause that names package P in the context of unit U makes the types
214 -- declared in the visible part of P available within U, but with the
215 -- restriction that these types can only be used as incomplete types.
216 -- The limited_with clause does not impose a semantic dependence on P,
217 -- and it is possible for two packages to have limited_with_clauses on
218 -- each other without creating an elaboration circularity.
220 -- To support this feature, the analysis of a limited_with clause must
221 -- create an abbreviated view of the package, without performing any
222 -- semantic analysis on it. This "package abstract" contains shadow
223 -- types that are in one-one correspondence with the real types in the
224 -- package, and that have the properties of incomplete types.
226 -- The implementation creates two element lists: one to chain the shadow
227 -- entities, and one to chain the corresponding type entities in the tree
228 -- of the package. Links between corresponding entities in both chains
229 -- allow the compiler to select the proper view of a given type, depending
230 -- on the context. Note that in contrast with the handling of private
231 -- types, the limited view and the non-limited view of a type are treated
232 -- as separate entities, and no entity exchange needs to take place, which
233 -- makes the implementation must simpler than could be feared.
235 ------------------------------
236 -- Analyze_Compilation_Unit --
237 ------------------------------
239 procedure Analyze_Compilation_Unit
(N
: Node_Id
) is
240 Unit_Node
: constant Node_Id
:= Unit
(N
);
241 Lib_Unit
: Node_Id
:= Library_Unit
(N
);
243 Main_Cunit
: constant Node_Id
:= Cunit
(Main_Unit
);
244 Par_Spec_Name
: Unit_Name_Type
;
245 Unum
: Unit_Number_Type
;
247 procedure Check_Redundant_Withs
248 (Context_Items
: List_Id
;
249 Spec_Context_Items
: List_Id
:= No_List
);
250 -- Determine whether the context list of a compilation unit contains
251 -- redundant with clauses. When checking body clauses against spec
252 -- clauses, set Context_Items to the context list of the body and
253 -- Spec_Context_Items to that of the spec. Parent packages are not
254 -- examined for documentation purposes.
256 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
);
257 -- Generate cross-reference information for the parents of child units.
258 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
260 ---------------------------
261 -- Check_Redundant_Withs --
262 ---------------------------
264 procedure Check_Redundant_Withs
265 (Context_Items
: List_Id
;
266 Spec_Context_Items
: List_Id
:= No_List
)
270 procedure Process_Body_Clauses
271 (Context_List
: List_Id
;
273 Used
: in out Boolean;
274 Used_Type_Or_Elab
: in out Boolean);
275 -- Examine the context clauses of a package body, trying to match
276 -- the name entity of Clause with any list element. If the match
277 -- occurs on a use package clause, set Used to True, for a use
278 -- type clause, pragma Elaborate or pragma Elaborate_All, set
279 -- Used_Type_Or_Elab to True.
281 procedure Process_Spec_Clauses
282 (Context_List
: List_Id
;
284 Used
: in out Boolean;
285 Withed
: in out Boolean;
286 Exit_On_Self
: Boolean := False);
287 -- Examine the context clauses of a package spec, trying to match
288 -- the name entity of Clause with any list element. If the match
289 -- occurs on a use package clause, set Used to True, for a with
290 -- package clause other than Clause, set Withed to True. Limited
291 -- with clauses, implicitly generated with clauses and withs
292 -- having pragmas Elaborate or Elaborate_All applied to them are
293 -- skipped. Exit_On_Self is used to control the search loop and
294 -- force an exit whenever Clause sees itself in the search.
296 --------------------------
297 -- Process_Body_Clauses --
298 --------------------------
300 procedure Process_Body_Clauses
301 (Context_List
: List_Id
;
303 Used
: in out Boolean;
304 Used_Type_Or_Elab
: in out Boolean)
306 Nam_Ent
: constant Entity_Id
:= Entity
(Name
(Clause
));
312 function Same_Unit
(N
: Node_Id
; P
: Entity_Id
) return Boolean;
313 -- In an expanded name in a use clause, if the prefix is a
314 -- renamed package, the entity is set to the original package
315 -- as a result, when checking whether the package appears in a
316 -- previous with_clause, the renaming has to be taken into
317 -- account, to prevent spurious or incorrect warnings. The
318 -- common case is the use of Text_IO.
324 function Same_Unit
(N
: Node_Id
; P
: Entity_Id
) return Boolean is
326 return Entity
(N
) = P
328 (Present
(Renamed_Object
(P
))
329 and then Entity
(N
) = Renamed_Object
(P
));
332 -- Start of processing for Process_Body_Clauses
336 Used_Type_Or_Elab
:= False;
338 Cont_Item
:= First
(Context_List
);
339 while Present
(Cont_Item
) loop
341 -- Package use clause
343 if Nkind
(Cont_Item
) = N_Use_Package_Clause
346 -- Search through use clauses
348 Use_Item
:= First
(Names
(Cont_Item
));
349 while Present
(Use_Item
) and then not Used
loop
351 -- Case of a direct use of the one we are looking for
353 if Entity
(Use_Item
) = Nam_Ent
then
356 -- Handle nested case, as in "with P; use P.Q.R"
363 -- Loop through prefixes looking for match
366 while Nkind
(UE
) = N_Expanded_Name
loop
367 if Same_Unit
(Prefix
(UE
), Nam_Ent
) then
382 elsif Nkind
(Cont_Item
) = N_Use_Type_Clause
383 and then not Used_Type_Or_Elab
385 Subt_Mark
:= First
(Subtype_Marks
(Cont_Item
));
386 while Present
(Subt_Mark
)
387 and then not Used_Type_Or_Elab
389 if Same_Unit
(Prefix
(Subt_Mark
), Nam_Ent
) then
390 Used_Type_Or_Elab
:= True;
396 -- Pragma Elaborate or Elaborate_All
398 elsif Nkind
(Cont_Item
) = N_Pragma
400 (Pragma_Name
(Cont_Item
) = Name_Elaborate
402 Pragma_Name
(Cont_Item
) = Name_Elaborate_All
)
403 and then not Used_Type_Or_Elab
406 First
(Pragma_Argument_Associations
(Cont_Item
));
407 while Present
(Prag_Unit
)
408 and then not Used_Type_Or_Elab
410 if Entity
(Expression
(Prag_Unit
)) = Nam_Ent
then
411 Used_Type_Or_Elab
:= True;
420 end Process_Body_Clauses
;
422 --------------------------
423 -- Process_Spec_Clauses --
424 --------------------------
426 procedure Process_Spec_Clauses
427 (Context_List
: List_Id
;
429 Used
: in out Boolean;
430 Withed
: in out Boolean;
431 Exit_On_Self
: Boolean := False)
433 Nam_Ent
: constant Entity_Id
:= Entity
(Name
(Clause
));
441 Cont_Item
:= First
(Context_List
);
442 while Present
(Cont_Item
) loop
444 -- Stop the search since the context items after Cont_Item
445 -- have already been examined in a previous iteration of
446 -- the reverse loop in Check_Redundant_Withs.
449 and Cont_Item
= Clause
454 -- Package use clause
456 if Nkind
(Cont_Item
) = N_Use_Package_Clause
459 Use_Item
:= First
(Names
(Cont_Item
));
460 while Present
(Use_Item
) and then not Used
loop
461 if Entity
(Use_Item
) = Nam_Ent
then
468 -- Package with clause. Avoid processing self, implicitly
469 -- generated with clauses or limited with clauses. Note
470 -- that we examine with clauses having pragmas Elaborate
471 -- or Elaborate_All applied to them due to cases such as:
475 -- pragma Elaborate (Pack);
477 -- In this case, the second with clause is redundant since
478 -- the pragma applies only to the first "with Pack;".
480 elsif Nkind
(Cont_Item
) = N_With_Clause
481 and then not Implicit_With
(Cont_Item
)
482 and then not Limited_Present
(Cont_Item
)
483 and then Cont_Item
/= Clause
484 and then Entity
(Name
(Cont_Item
)) = Nam_Ent
491 end Process_Spec_Clauses
;
493 -- Start of processing for Check_Redundant_Withs
496 Clause
:= Last
(Context_Items
);
497 while Present
(Clause
) loop
499 -- Avoid checking implicitly generated with clauses, limited
500 -- with clauses or withs that have pragma Elaborate or
501 -- Elaborate_All applied.
503 if Nkind
(Clause
) = N_With_Clause
504 and then not Implicit_With
(Clause
)
505 and then not Limited_Present
(Clause
)
506 and then not Elaborate_Present
(Clause
)
508 -- Package body-to-spec check
510 if Present
(Spec_Context_Items
) then
512 Used_In_Body
: Boolean := False;
513 Used_In_Spec
: Boolean := False;
514 Used_Type_Or_Elab
: Boolean := False;
515 Withed_In_Spec
: Boolean := False;
519 (Context_List
=> Spec_Context_Items
,
521 Used
=> Used_In_Spec
,
522 Withed
=> Withed_In_Spec
);
525 (Context_List
=> Context_Items
,
527 Used
=> Used_In_Body
,
528 Used_Type_Or_Elab
=> Used_Type_Or_Elab
);
530 -- "Type Elab" refers to the presence of either a use
531 -- type clause, pragmas Elaborate or Elaborate_All.
533 -- +---------------+---------------------------+------+
534 -- | Spec | Body | Warn |
535 -- +--------+------+--------+------+-----------+------+
536 -- | Withed | Used | Withed | Used | Type Elab | |
537 -- | X | | X | | | X |
538 -- | X | | X | X | | |
539 -- | X | | X | | X | |
540 -- | X | | X | X | X | |
541 -- | X | X | X | | | X |
542 -- | X | X | X | | X | |
543 -- | X | X | X | X | | X |
544 -- | X | X | X | X | X | |
545 -- +--------+------+--------+------+-----------+------+
548 and then not Used_Type_Or_Elab
)
551 and then not Used_In_Body
)
555 Error_Msg_N
-- CODEFIX
556 ("?redundant with clause in body", Clause
);
559 Used_In_Body
:= False;
560 Used_In_Spec
:= False;
561 Used_Type_Or_Elab
:= False;
562 Withed_In_Spec
:= False;
565 -- Standalone package spec or body check
569 Dont_Care
: Boolean := False;
570 Withed
: Boolean := False;
573 -- The mechanism for examining the context clauses of a
574 -- package spec can be applied to package body clauses.
577 (Context_List
=> Context_Items
,
581 Exit_On_Self
=> True);
584 Error_Msg_N
-- CODEFIX
585 ("?redundant with clause", Clause
);
593 end Check_Redundant_Withs
;
595 --------------------------------
596 -- Generate_Parent_References --
597 --------------------------------
599 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
) is
601 P_Name
: Entity_Id
:= P_Id
;
604 Pref
:= Name
(Parent
(Defining_Entity
(N
)));
606 if Nkind
(Pref
) = N_Expanded_Name
then
608 -- Done already, if the unit has been compiled indirectly as
609 -- part of the closure of its context because of inlining.
614 while Nkind
(Pref
) = N_Selected_Component
loop
615 Change_Selected_Component_To_Expanded_Name
(Pref
);
616 Set_Entity
(Pref
, P_Name
);
617 Set_Etype
(Pref
, Etype
(P_Name
));
618 Generate_Reference
(P_Name
, Pref
, 'r');
619 Pref
:= Prefix
(Pref
);
620 P_Name
:= Scope
(P_Name
);
623 -- The guard here on P_Name is to handle the error condition where
624 -- the parent unit is missing because the file was not found.
626 if Present
(P_Name
) then
627 Set_Entity
(Pref
, P_Name
);
628 Set_Etype
(Pref
, Etype
(P_Name
));
629 Generate_Reference
(P_Name
, Pref
, 'r');
630 Style
.Check_Identifier
(Pref
, P_Name
);
632 end Generate_Parent_References
;
634 -- Start of processing for Analyze_Compilation_Unit
637 Process_Compilation_Unit_Pragmas
(N
);
639 -- If the unit is a subunit whose parent has not been analyzed (which
640 -- indicates that the main unit is a subunit, either the current one or
641 -- one of its descendents) then the subunit is compiled as part of the
642 -- analysis of the parent, which we proceed to do. Basically this gets
643 -- handled from the top down and we don't want to do anything at this
644 -- level (i.e. this subunit will be handled on the way down from the
645 -- parent), so at this level we immediately return. If the subunit
646 -- ends up not analyzed, it means that the parent did not contain a
647 -- stub for it, or that there errors were detected in some ancestor.
649 if Nkind
(Unit_Node
) = N_Subunit
650 and then not Analyzed
(Lib_Unit
)
652 Semantics
(Lib_Unit
);
654 if not Analyzed
(Proper_Body
(Unit_Node
)) then
655 if Serious_Errors_Detected
> 0 then
656 Error_Msg_N
("subunit not analyzed (errors in parent unit)", N
);
658 Error_Msg_N
("missing stub for subunit", N
);
665 -- Analyze context (this will call Sem recursively for with'ed units)
666 -- To detect circularities among with-clauses that are not caught during
667 -- loading, we set the Context_Pending flag on the current unit. If the
668 -- flag is already set there is a potential circularity.
669 -- We exclude predefined units from this check because they are known
670 -- to be safe. We also exclude package bodies that are present because
671 -- circularities between bodies are harmless (and necessary).
673 if Context_Pending
(N
) then
675 Circularity
: Boolean := True;
678 if Is_Predefined_File_Name
679 (Unit_File_Name
(Get_Source_Unit
(Unit
(N
))))
681 Circularity
:= False;
684 for U
in Main_Unit
+ 1 .. Last_Unit
loop
685 if Nkind
(Unit
(Cunit
(U
))) = N_Package_Body
686 and then not Analyzed
(Cunit
(U
))
688 Circularity
:= False;
695 Error_Msg_N
("circular dependency caused by with_clauses", N
);
697 ("\possibly missing limited_with clause"
698 & " in one of the following", N
);
700 for U
in Main_Unit
.. Last_Unit
loop
701 if Context_Pending
(Cunit
(U
)) then
702 Error_Msg_Unit_1
:= Get_Unit_Name
(Unit
(Cunit
(U
)));
703 Error_Msg_N
("\unit$", N
);
707 raise Unrecoverable_Error
;
711 Set_Context_Pending
(N
);
716 Set_Context_Pending
(N
, False);
718 -- If the unit is a package body, the spec is already loaded and must be
719 -- analyzed first, before we analyze the body.
721 if Nkind
(Unit_Node
) = N_Package_Body
then
723 -- If no Lib_Unit, then there was a serious previous error, so just
724 -- ignore the entire analysis effort
726 if No
(Lib_Unit
) then
730 Semantics
(Lib_Unit
);
731 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
733 -- Verify that the library unit is a package declaration
735 if not Nkind_In
(Unit
(Lib_Unit
), N_Package_Declaration
,
736 N_Generic_Package_Declaration
)
739 ("no legal package declaration for package body", N
);
742 -- Otherwise, the entity in the declaration is visible. Update the
743 -- version to reflect dependence of this body on the spec.
746 Spec_Id
:= Defining_Entity
(Unit
(Lib_Unit
));
747 Set_Is_Immediately_Visible
(Spec_Id
, True);
748 Version_Update
(N
, Lib_Unit
);
750 if Nkind
(Defining_Unit_Name
(Unit_Node
)) =
751 N_Defining_Program_Unit_Name
753 Generate_Parent_References
(Unit_Node
, Scope
(Spec_Id
));
758 -- If the unit is a subprogram body, then we similarly need to analyze
759 -- its spec. However, things are a little simpler in this case, because
760 -- here, this analysis is done only for error checking and consistency
761 -- purposes, so there's nothing else to be done.
763 elsif Nkind
(Unit_Node
) = N_Subprogram_Body
then
764 if Acts_As_Spec
(N
) then
766 -- If the subprogram body is a child unit, we must create a
767 -- declaration for it, in order to properly load the parent(s).
768 -- After this, the original unit does not acts as a spec, because
769 -- there is an explicit one. If this unit appears in a context
770 -- clause, then an implicit with on the parent will be added when
771 -- installing the context. If this is the main unit, there is no
772 -- Unit_Table entry for the declaration (it has the unit number
773 -- of the main unit) and code generation is unaffected.
775 Unum
:= Get_Cunit_Unit_Number
(N
);
776 Par_Spec_Name
:= Get_Parent_Spec_Name
(Unit_Name
(Unum
));
778 if Par_Spec_Name
/= No_Unit_Name
then
781 (Load_Name
=> Par_Spec_Name
,
786 if Unum
/= No_Unit
then
788 -- Build subprogram declaration and attach parent unit to it
789 -- This subprogram declaration does not come from source,
790 -- Nevertheless the backend must generate debugging info for
791 -- it, and this must be indicated explicitly. We also mark
792 -- the body entity as a child unit now, to prevent a
793 -- cascaded error if the spec entity cannot be entered
794 -- in its scope. Finally we create a Units table entry for
795 -- the subprogram declaration, to maintain a one-to-one
796 -- correspondence with compilation unit nodes. This is
797 -- critical for the tree traversals performed by CodePeer.
800 Loc
: constant Source_Ptr
:= Sloc
(N
);
801 SCS
: constant Boolean :=
802 Get_Comes_From_Source_Default
;
805 Set_Comes_From_Source_Default
(False);
807 Make_Compilation_Unit
(Loc
,
808 Context_Items
=> New_Copy_List
(Context_Items
(N
)),
810 Make_Subprogram_Declaration
(Sloc
(N
),
813 (Specification
(Unit_Node
))),
815 Make_Compilation_Unit_Aux
(Loc
));
817 Set_Library_Unit
(N
, Lib_Unit
);
818 Set_Parent_Spec
(Unit
(Lib_Unit
), Cunit
(Unum
));
819 Make_Child_Decl_Unit
(N
);
820 Semantics
(Lib_Unit
);
822 -- Now that a separate declaration exists, the body
823 -- of the child unit does not act as spec any longer.
825 Set_Acts_As_Spec
(N
, False);
826 Set_Is_Child_Unit
(Defining_Entity
(Unit_Node
));
827 Set_Debug_Info_Needed
(Defining_Entity
(Unit
(Lib_Unit
)));
828 Set_Comes_From_Source_Default
(SCS
);
833 -- Here for subprogram with separate declaration
836 Semantics
(Lib_Unit
);
837 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
838 Version_Update
(N
, Lib_Unit
);
841 -- If this is a child unit, generate references to the parents
843 if Nkind
(Defining_Unit_Name
(Specification
(Unit_Node
))) =
844 N_Defining_Program_Unit_Name
846 Generate_Parent_References
(
847 Specification
(Unit_Node
),
848 Scope
(Defining_Entity
(Unit
(Lib_Unit
))));
852 -- If it is a child unit, the parent must be elaborated first and we
853 -- update version, since we are dependent on our parent.
855 if Is_Child_Spec
(Unit_Node
) then
857 -- The analysis of the parent is done with style checks off
860 Save_Style_Check
: constant Boolean := Style_Check
;
861 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
862 Cunit_Boolean_Restrictions_Save
;
865 if not GNAT_Mode
then
866 Style_Check
:= False;
869 Semantics
(Parent_Spec
(Unit_Node
));
870 Version_Update
(N
, Parent_Spec
(Unit_Node
));
871 Style_Check
:= Save_Style_Check
;
872 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
876 -- With the analysis done, install the context. Note that we can't
877 -- install the context from the with clauses as we analyze them, because
878 -- each with clause must be analyzed in a clean visibility context, so
879 -- we have to wait and install them all at once.
883 if Is_Child_Spec
(Unit_Node
) then
885 -- Set the entities of all parents in the program_unit_name
887 Generate_Parent_References
(
888 Unit_Node
, Get_Parent_Entity
(Unit
(Parent_Spec
(Unit_Node
))));
891 -- All components of the context: with-clauses, library unit, ancestors
892 -- if any, (and their context) are analyzed and installed.
894 -- Call special debug routine sm if this is the main unit
896 if Current_Sem_Unit
= Main_Unit
then
900 -- Now analyze the unit (package, subprogram spec, body) itself
904 if Warn_On_Redundant_Constructs
then
905 Check_Redundant_Withs
(Context_Items
(N
));
907 if Nkind
(Unit_Node
) = N_Package_Body
then
908 Check_Redundant_Withs
909 (Context_Items
=> Context_Items
(N
),
910 Spec_Context_Items
=> Context_Items
(Lib_Unit
));
914 -- The above call might have made Unit_Node an N_Subprogram_Body from
915 -- something else, so propagate any Acts_As_Spec flag.
917 if Nkind
(Unit_Node
) = N_Subprogram_Body
918 and then Acts_As_Spec
(Unit_Node
)
920 Set_Acts_As_Spec
(N
);
923 -- Register predefined units in Rtsfind
926 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Sloc
(N
));
928 if Is_Predefined_File_Name
(Unit_File_Name
(Unum
)) then
929 Set_RTU_Loaded
(Unit_Node
);
933 -- Treat compilation unit pragmas that appear after the library unit
935 if Present
(Pragmas_After
(Aux_Decls_Node
(N
))) then
937 Prag_Node
: Node_Id
:= First
(Pragmas_After
(Aux_Decls_Node
(N
)));
939 while Present
(Prag_Node
) loop
946 -- Generate distribution stubs if requested and no error
949 and then (Distribution_Stub_Mode
= Generate_Receiver_Stub_Body
951 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
952 and then not Fatal_Error
(Main_Unit
)
954 if Is_RCI_Pkg_Spec_Or_Body
(N
) then
956 -- Regular RCI package
958 Add_Stub_Constructs
(N
);
960 elsif (Nkind
(Unit_Node
) = N_Package_Declaration
961 and then Is_Shared_Passive
(Defining_Entity
962 (Specification
(Unit_Node
))))
963 or else (Nkind
(Unit_Node
) = N_Package_Body
965 Is_Shared_Passive
(Corresponding_Spec
(Unit_Node
)))
967 -- Shared passive package
969 Add_Stub_Constructs
(N
);
971 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
973 Is_Remote_Call_Interface
974 (Defining_Entity
(Specification
(Instance_Spec
(Unit_Node
))))
976 -- Instantiation of a RCI generic package
978 Add_Stub_Constructs
(N
);
982 -- Remove unit from visibility, so that environment is clean for
983 -- the next compilation, which is either the main unit or some
984 -- other unit in the context.
986 if Nkind_In
(Unit_Node
, N_Package_Declaration
,
987 N_Package_Renaming_Declaration
,
988 N_Subprogram_Declaration
)
989 or else Nkind
(Unit_Node
) in N_Generic_Declaration
991 (Nkind
(Unit_Node
) = N_Subprogram_Body
992 and then Acts_As_Spec
(Unit_Node
))
994 Remove_Unit_From_Visibility
(Defining_Entity
(Unit_Node
));
996 -- If the unit is an instantiation whose body will be elaborated for
997 -- inlining purposes, use the proper entity of the instance. The
998 -- entity may be missing if the instantiation was illegal.
1000 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
1001 and then not Error_Posted
(Unit_Node
)
1002 and then Present
(Instance_Spec
(Unit_Node
))
1004 Remove_Unit_From_Visibility
1005 (Defining_Entity
(Instance_Spec
(Unit_Node
)));
1007 elsif Nkind
(Unit_Node
) = N_Package_Body
1008 or else (Nkind
(Unit_Node
) = N_Subprogram_Body
1009 and then not Acts_As_Spec
(Unit_Node
))
1011 -- Bodies that are not the main unit are compiled if they are generic
1012 -- or contain generic or inlined units. Their analysis brings in the
1013 -- context of the corresponding spec (unit declaration) which must be
1014 -- removed as well, to return the compilation environment to its
1017 Remove_Context
(Lib_Unit
);
1018 Set_Is_Immediately_Visible
(Defining_Entity
(Unit
(Lib_Unit
)), False);
1021 -- Last step is to deinstall the context we just installed as well as
1022 -- the unit just compiled.
1026 -- If this is the main unit and we are generating code, we must check
1027 -- that all generic units in the context have a body if they need it,
1028 -- even if they have not been instantiated. In the absence of .ali files
1029 -- for generic units, we must force the load of the body, just to
1030 -- produce the proper error if the body is absent. We skip this
1031 -- verification if the main unit itself is generic.
1033 if Get_Cunit_Unit_Number
(N
) = Main_Unit
1034 and then Operating_Mode
= Generate_Code
1035 and then Expander_Active
1037 -- Check whether the source for the body of the unit must be included
1038 -- in a standalone library.
1040 Check_Body_Needed_For_SAL
(Cunit_Entity
(Main_Unit
));
1042 -- Indicate that the main unit is now analyzed, to catch possible
1043 -- circularities between it and generic bodies. Remove main unit from
1044 -- visibility. This might seem superfluous, but the main unit must
1045 -- not be visible in the generic body expansions that follow.
1047 Set_Analyzed
(N
, True);
1048 Set_Is_Immediately_Visible
(Cunit_Entity
(Main_Unit
), False);
1053 Un
: Unit_Number_Type
;
1055 Save_Style_Check
: constant Boolean := Style_Check
;
1056 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
1057 Cunit_Boolean_Restrictions_Save
;
1060 Item
:= First
(Context_Items
(N
));
1061 while Present
(Item
) loop
1063 -- Check for explicit with clause
1065 if Nkind
(Item
) = N_With_Clause
1066 and then not Implicit_With
(Item
)
1068 -- Ada 2005 (AI-50217): Ignore limited-withed units
1070 and then not Limited_Present
(Item
)
1072 Nam
:= Entity
(Name
(Item
));
1074 -- Compile generic subprogram, unless it is intrinsic or
1075 -- imported so no body is required, or generic package body
1076 -- if the package spec requires a body.
1078 if (Is_Generic_Subprogram
(Nam
)
1079 and then not Is_Intrinsic_Subprogram
(Nam
)
1080 and then not Is_Imported
(Nam
))
1081 or else (Ekind
(Nam
) = E_Generic_Package
1082 and then Unit_Requires_Body
(Nam
))
1084 Style_Check
:= False;
1086 if Present
(Renamed_Object
(Nam
)) then
1089 (Load_Name
=> Get_Body_Name
1091 (Unit_Declaration_Node
1092 (Renamed_Object
(Nam
)))),
1100 (Load_Name
=> Get_Body_Name
1101 (Get_Unit_Name
(Item
)),
1108 if Un
= No_Unit
then
1110 ("body of generic unit& not found", Item
, Nam
);
1113 elsif not Analyzed
(Cunit
(Un
))
1114 and then Un
/= Main_Unit
1115 and then not Fatal_Error
(Un
)
1117 Style_Check
:= False;
1118 Semantics
(Cunit
(Un
));
1126 Style_Check
:= Save_Style_Check
;
1127 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
1131 -- Deal with creating elaboration Boolean if needed. We create an
1132 -- elaboration boolean only for units that come from source since
1133 -- units manufactured by the compiler never need elab checks.
1135 if Comes_From_Source
(N
)
1136 and then Nkind_In
(Unit_Node
, N_Package_Declaration
,
1137 N_Generic_Package_Declaration
,
1138 N_Subprogram_Declaration
,
1139 N_Generic_Subprogram_Declaration
)
1142 Loc
: constant Source_Ptr
:= Sloc
(N
);
1143 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Loc
);
1146 Spec_Id
:= Defining_Entity
(Unit_Node
);
1147 Generate_Definition
(Spec_Id
);
1149 -- See if an elaboration entity is required for possible access
1150 -- before elaboration checking. Note that we must allow for this
1151 -- even if -gnatE is not set, since a client may be compiled in
1152 -- -gnatE mode and reference the entity.
1154 -- These entities are also used by the binder to prevent multiple
1155 -- attempts to execute the elaboration code for the library case
1156 -- where the elaboration routine might otherwise be called more
1159 -- Case of units which do not require elaboration checks
1162 -- Pure units do not need checks
1166 -- Preelaborated units do not need checks
1168 or else Is_Preelaborated
(Spec_Id
)
1170 -- No checks needed if pragma Elaborate_Body present
1172 or else Has_Pragma_Elaborate_Body
(Spec_Id
)
1174 -- No checks needed if unit does not require a body
1176 or else not Unit_Requires_Body
(Spec_Id
)
1178 -- No checks needed for predefined files
1180 or else Is_Predefined_File_Name
(Unit_File_Name
(Unum
))
1182 -- No checks required if no separate spec
1184 or else Acts_As_Spec
(N
)
1186 -- This is a case where we only need the entity for
1187 -- checking to prevent multiple elaboration checks.
1189 Set_Elaboration_Entity_Required
(Spec_Id
, False);
1191 -- Case of elaboration entity is required for access before
1192 -- elaboration checking (so certainly we must build it!)
1195 Set_Elaboration_Entity_Required
(Spec_Id
, True);
1198 Build_Elaboration_Entity
(N
, Spec_Id
);
1202 -- Freeze the compilation unit entity. This for sure is needed because
1203 -- of some warnings that can be output (see Freeze_Subprogram), but may
1204 -- in general be required. If freezing actions result, place them in the
1205 -- compilation unit actions list, and analyze them.
1208 Loc
: constant Source_Ptr
:= Sloc
(N
);
1209 L
: constant List_Id
:=
1210 Freeze_Entity
(Cunit_Entity
(Current_Sem_Unit
), Loc
);
1212 while Is_Non_Empty_List
(L
) loop
1213 Insert_Library_Level_Action
(Remove_Head
(L
));
1219 if Nkind
(Unit_Node
) = N_Package_Declaration
1220 and then Get_Cunit_Unit_Number
(N
) /= Main_Unit
1221 and then Expander_Active
1224 Save_Style_Check
: constant Boolean := Style_Check
;
1225 Save_Warning
: constant Warning_Mode_Type
:= Warning_Mode
;
1226 Options
: Style_Check_Options
;
1229 Save_Style_Check_Options
(Options
);
1230 Reset_Style_Check_Options
;
1231 Opt
.Warning_Mode
:= Suppress
;
1232 Check_Body_For_Inlining
(N
, Defining_Entity
(Unit_Node
));
1234 Reset_Style_Check_Options
;
1235 Set_Style_Check_Options
(Options
);
1236 Style_Check
:= Save_Style_Check
;
1237 Warning_Mode
:= Save_Warning
;
1241 -- If we are generating obsolescent warnings, then here is where we
1242 -- generate them for the with'ed items. The reason for this special
1243 -- processing is that the normal mechanism of generating the warnings
1244 -- for referenced entities does not work for context clause references.
1245 -- That's because when we first analyze the context, it is too early to
1246 -- know if the with'ing unit is itself obsolescent (which suppresses
1249 if not GNAT_Mode
and then Warn_On_Obsolescent_Feature
then
1251 -- Push current compilation unit as scope, so that the test for
1252 -- being within an obsolescent unit will work correctly.
1254 Push_Scope
(Defining_Entity
(Unit_Node
));
1256 -- Loop through context items to deal with with clauses
1264 Item
:= First
(Context_Items
(N
));
1265 while Present
(Item
) loop
1266 if Nkind
(Item
) = N_With_Clause
1268 -- Suppress this check in limited-withed units. Further work
1269 -- needed here if we decide to incorporate this check on
1270 -- limited-withed units.
1272 and then not Limited_Present
(Item
)
1275 Ent
:= Entity
(Nam
);
1277 if Is_Obsolescent
(Ent
) then
1278 Output_Obsolescent_Entity_Warnings
(Nam
, Ent
);
1286 -- Remove temporary install of current unit as scope
1290 end Analyze_Compilation_Unit
;
1292 ---------------------
1293 -- Analyze_Context --
1294 ---------------------
1296 procedure Analyze_Context
(N
: Node_Id
) is
1297 Ukind
: constant Node_Kind
:= Nkind
(Unit
(N
));
1301 -- First process all configuration pragmas at the start of the context
1302 -- items. Strictly these are not part of the context clause, but that
1303 -- is where the parser puts them. In any case for sure we must analyze
1304 -- these before analyzing the actual context items, since they can have
1305 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1306 -- be with'ed as a result of changing categorizations in Ada 2005).
1308 Item
:= First
(Context_Items
(N
));
1309 while Present
(Item
)
1310 and then Nkind
(Item
) = N_Pragma
1311 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
1317 -- This is the point at which we capture the configuration settings
1318 -- for the unit. At the moment only the Optimize_Alignment setting
1319 -- needs to be captured. Probably more later ???
1321 if Optimize_Alignment_Local
then
1322 Set_OA_Setting
(Current_Sem_Unit
, 'L');
1324 Set_OA_Setting
(Current_Sem_Unit
, Optimize_Alignment
);
1327 -- Loop through actual context items. This is done in two passes:
1329 -- a) The first pass analyzes non-limited with-clauses and also any
1330 -- configuration pragmas (we need to get the latter analyzed right
1331 -- away, since they can affect processing of subsequent items.
1333 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1335 while Present
(Item
) loop
1337 -- For with clause, analyze the with clause, and then update the
1338 -- version, since we are dependent on a unit that we with.
1340 if Nkind
(Item
) = N_With_Clause
1341 and then not Limited_Present
(Item
)
1343 -- Skip analyzing with clause if no unit, nothing to do (this
1344 -- happens for a with that references a non-existent unit). Skip
1345 -- as well if this is a with_clause for the main unit, which
1346 -- happens if a subunit has a useless with_clause on its parent.
1348 if Present
(Library_Unit
(Item
)) then
1349 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
) then
1353 Set_Entity
(Name
(Item
), Cunit_Entity
(Current_Sem_Unit
));
1357 if not Implicit_With
(Item
) then
1358 Version_Update
(N
, Library_Unit
(Item
));
1361 -- Skip pragmas. Configuration pragmas at the start were handled in
1362 -- the loop above, and remaining pragmas are not processed until we
1363 -- actually install the context (see Install_Context). We delay the
1364 -- analysis of these pragmas to make sure that we have installed all
1365 -- the implicit with's on parent units.
1367 -- Skip use clauses at this stage, since we don't want to do any
1368 -- installing of potentially use-visible entities until we
1369 -- actually install the complete context (in Install_Context).
1370 -- Otherwise things can get installed in the wrong context.
1379 -- Second pass: examine all limited_with clauses. All other context
1380 -- items are ignored in this pass.
1382 Item
:= First
(Context_Items
(N
));
1383 while Present
(Item
) loop
1384 if Nkind
(Item
) = N_With_Clause
1385 and then Limited_Present
(Item
)
1387 -- No need to check errors on implicitly generated limited-with
1390 if not Implicit_With
(Item
) then
1392 -- Verify that the illegal contexts given in 10.1.2 (18/2) are
1393 -- properly rejected, including renaming declarations.
1395 if not Nkind_In
(Ukind
, N_Package_Declaration
,
1396 N_Subprogram_Declaration
)
1397 and then Ukind
not in N_Generic_Declaration
1398 and then Ukind
not in N_Generic_Instantiation
1400 Error_Msg_N
("limited with_clause not allowed here", Item
);
1402 -- Check wrong use of a limited with clause applied to the
1403 -- compilation unit containing the limited-with clause.
1405 -- limited with P.Q;
1406 -- package P.Q is ...
1408 elsif Unit
(Library_Unit
(Item
)) = Unit
(N
) then
1409 Error_Msg_N
("wrong use of limited-with clause", Item
);
1411 -- Check wrong use of limited-with clause applied to some
1412 -- immediate ancestor.
1414 elsif Is_Child_Spec
(Unit
(N
)) then
1416 Lib_U
: constant Entity_Id
:= Unit
(Library_Unit
(Item
));
1420 P
:= Parent_Spec
(Unit
(N
));
1422 if Unit
(P
) = Lib_U
then
1423 Error_Msg_N
("limited with_clause of immediate "
1424 & "ancestor not allowed", Item
);
1428 exit when not Is_Child_Spec
(Unit
(P
));
1429 P
:= Parent_Spec
(Unit
(P
));
1434 -- Check if the limited-withed unit is already visible through
1435 -- some context clause of the current compilation unit or some
1436 -- ancestor of the current compilation unit.
1439 Lim_Unit_Name
: constant Node_Id
:= Name
(Item
);
1440 Comp_Unit
: Node_Id
;
1442 Unit_Name
: Node_Id
;
1447 It
:= First
(Context_Items
(Comp_Unit
));
1448 while Present
(It
) loop
1450 and then Nkind
(It
) = N_With_Clause
1451 and then not Limited_Present
(It
)
1453 Nkind_In
(Unit
(Library_Unit
(It
)),
1454 N_Package_Declaration
,
1455 N_Package_Renaming_Declaration
)
1457 if Nkind
(Unit
(Library_Unit
(It
))) =
1458 N_Package_Declaration
1460 Unit_Name
:= Name
(It
);
1462 Unit_Name
:= Name
(Unit
(Library_Unit
(It
)));
1465 -- Check if the named package (or some ancestor)
1466 -- leaves visible the full-view of the unit given
1467 -- in the limited-with clause
1470 if Designate_Same_Unit
(Lim_Unit_Name
,
1473 Error_Msg_Sloc
:= Sloc
(It
);
1475 ("simultaneous visibility of limited "
1476 & "and unlimited views not allowed",
1479 ("\unlimited view visible through "
1480 & "context clause #",
1484 elsif Nkind
(Unit_Name
) = N_Identifier
then
1488 Unit_Name
:= Prefix
(Unit_Name
);
1495 exit when not Is_Child_Spec
(Unit
(Comp_Unit
));
1497 Comp_Unit
:= Parent_Spec
(Unit
(Comp_Unit
));
1502 -- Skip analyzing with clause if no unit, see above
1504 if Present
(Library_Unit
(Item
)) then
1508 -- A limited_with does not impose an elaboration order, but
1509 -- there is a semantic dependency for recompilation purposes.
1511 if not Implicit_With
(Item
) then
1512 Version_Update
(N
, Library_Unit
(Item
));
1515 -- Pragmas and use clauses and with clauses other than limited
1516 -- with's are ignored in this pass through the context items.
1524 end Analyze_Context
;
1526 -------------------------------
1527 -- Analyze_Package_Body_Stub --
1528 -------------------------------
1530 procedure Analyze_Package_Body_Stub
(N
: Node_Id
) is
1531 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1535 -- The package declaration must be in the current declarative part
1537 Check_Stub_Level
(N
);
1538 Nam
:= Current_Entity_In_Scope
(Id
);
1540 if No
(Nam
) or else not Is_Package_Or_Generic_Package
(Nam
) then
1541 Error_Msg_N
("missing specification for package stub", N
);
1543 elsif Has_Completion
(Nam
)
1544 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(Nam
)))
1546 Error_Msg_N
("duplicate or redundant stub for package", N
);
1549 -- Indicate that the body of the package exists. If we are doing
1550 -- only semantic analysis, the stub stands for the body. If we are
1551 -- generating code, the existence of the body will be confirmed
1552 -- when we load the proper body.
1554 Set_Has_Completion
(Nam
);
1555 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1556 Generate_Reference
(Nam
, Id
, 'b');
1557 Analyze_Proper_Body
(N
, Nam
);
1559 end Analyze_Package_Body_Stub
;
1561 -------------------------
1562 -- Analyze_Proper_Body --
1563 -------------------------
1565 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
) is
1566 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
1567 Unum
: Unit_Number_Type
;
1569 procedure Optional_Subunit
;
1570 -- This procedure is called when the main unit is a stub, or when we
1571 -- are not generating code. In such a case, we analyze the subunit if
1572 -- present, which is user-friendly and in fact required for ASIS, but
1573 -- we don't complain if the subunit is missing.
1575 ----------------------
1576 -- Optional_Subunit --
1577 ----------------------
1579 procedure Optional_Subunit
is
1580 Comp_Unit
: Node_Id
;
1583 -- Try to load subunit, but ignore any errors that occur during
1584 -- the loading of the subunit, by using the special feature in
1585 -- Errout to ignore all errors. Note that Fatal_Error will still
1586 -- be set, so we will be able to check for this case below.
1588 if not ASIS_Mode
then
1589 Ignore_Errors_Enable
:= Ignore_Errors_Enable
+ 1;
1594 (Load_Name
=> Subunit_Name
,
1599 if not ASIS_Mode
then
1600 Ignore_Errors_Enable
:= Ignore_Errors_Enable
- 1;
1603 -- All done if we successfully loaded the subunit
1606 and then (not Fatal_Error
(Unum
) or else Try_Semantics
)
1608 Comp_Unit
:= Cunit
(Unum
);
1610 -- If the file was empty or seriously mangled, the unit itself may
1613 if No
(Unit
(Comp_Unit
)) then
1615 ("subunit does not contain expected proper body", N
);
1617 elsif Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1619 ("expected SEPARATE subunit, found child unit",
1620 Cunit_Entity
(Unum
));
1622 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1623 Analyze_Subunit
(Comp_Unit
);
1624 Set_Library_Unit
(N
, Comp_Unit
);
1627 elsif Unum
= No_Unit
1628 and then Present
(Nam
)
1630 if Is_Protected_Type
(Nam
) then
1631 Set_Corresponding_Body
(Parent
(Nam
), Defining_Identifier
(N
));
1633 Set_Corresponding_Body
(
1634 Unit_Declaration_Node
(Nam
), Defining_Identifier
(N
));
1637 end Optional_Subunit
;
1639 -- Start of processing for Analyze_Proper_Body
1642 -- If the subunit is already loaded, it means that the main unit is a
1643 -- subunit, and that the current unit is one of its parents which was
1644 -- being analyzed to provide the needed context for the analysis of the
1645 -- subunit. In this case we analyze the subunit and continue with the
1646 -- parent, without looking a subsequent subunits.
1648 if Is_Loaded
(Subunit_Name
) then
1650 -- If the proper body is already linked to the stub node, the stub is
1651 -- in a generic unit and just needs analyzing.
1653 if Present
(Library_Unit
(N
)) then
1654 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1655 Analyze_Subunit
(Library_Unit
(N
));
1657 -- Otherwise we must load the subunit and link to it
1660 -- Load the subunit, this must work, since we originally loaded
1661 -- the subunit earlier on. So this will not really load it, just
1662 -- give access to it.
1666 (Load_Name
=> Subunit_Name
,
1671 -- And analyze the subunit in the parent context (note that we
1672 -- do not call Semantics, since that would remove the parent
1673 -- context). Because of this, we have to manually reset the
1674 -- compiler state to Analyzing since it got destroyed by Load.
1676 if Unum
/= No_Unit
then
1677 Compiler_State
:= Analyzing
;
1679 -- Check that the proper body is a subunit and not a child
1680 -- unit. If the unit was previously loaded, the error will
1681 -- have been emitted when copying the generic node, so we
1682 -- just return to avoid cascaded errors.
1684 if Nkind
(Unit
(Cunit
(Unum
))) /= N_Subunit
then
1688 Set_Corresponding_Stub
(Unit
(Cunit
(Unum
)), N
);
1689 Analyze_Subunit
(Cunit
(Unum
));
1690 Set_Library_Unit
(N
, Cunit
(Unum
));
1694 -- If the main unit is a subunit, then we are just performing semantic
1695 -- analysis on that subunit, and any other subunits of any parent unit
1696 -- should be ignored, except that if we are building trees for ASIS
1697 -- usage we want to annotate the stub properly.
1699 elsif Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
1700 and then Subunit_Name
/= Unit_Name
(Main_Unit
)
1706 -- But before we return, set the flag for unloaded subunits. This
1707 -- will suppress junk warnings of variables in the same declarative
1708 -- part (or a higher level one) that are in danger of looking unused
1709 -- when in fact there might be a declaration in the subunit that we
1710 -- do not intend to load.
1712 Unloaded_Subunits
:= True;
1715 -- If the subunit is not already loaded, and we are generating code,
1716 -- then this is the case where compilation started from the parent,
1717 -- and we are generating code for an entire subunit tree. In that
1718 -- case we definitely need to load the subunit.
1720 -- In order to continue the analysis with the rest of the parent,
1721 -- and other subunits, we load the unit without requiring its
1722 -- presence, and emit a warning if not found, rather than terminating
1723 -- the compilation abruptly, as for other missing file problems.
1725 elsif Original_Operating_Mode
= Generate_Code
then
1727 -- If the proper body is already linked to the stub node,
1728 -- the stub is in a generic unit and just needs analyzing.
1730 -- We update the version. Although we are not technically
1731 -- semantically dependent on the subunit, given our approach
1732 -- of macro substitution of subunits, it makes sense to
1733 -- include it in the version identification.
1735 if Present
(Library_Unit
(N
)) then
1736 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1737 Analyze_Subunit
(Library_Unit
(N
));
1738 Version_Update
(Cunit
(Main_Unit
), Library_Unit
(N
));
1740 -- Otherwise we must load the subunit and link to it
1745 (Load_Name
=> Subunit_Name
,
1750 -- Give message if we did not get the unit
1751 -- Emit warning even if missing subunit is not
1752 -- within main unit, to simplify debugging.
1754 if Original_Operating_Mode
= Generate_Code
1755 and then Unum
= No_Unit
1757 Error_Msg_Unit_1
:= Subunit_Name
;
1759 Get_File_Name
(Subunit_Name
, Subunit
=> True);
1761 ("subunit$$ in file{ not found?!!", N
);
1762 Subunits_Missing
:= True;
1765 -- Load_Unit may reset Compiler_State, since it may have been
1766 -- necessary to parse an additional units, so we make sure
1767 -- that we reset it to the Analyzing state.
1769 Compiler_State
:= Analyzing
;
1771 if Unum
/= No_Unit
then
1772 if Debug_Flag_L
then
1773 Write_Str
("*** Loaded subunit from stub. Analyze");
1778 Comp_Unit
: constant Node_Id
:= Cunit
(Unum
);
1781 -- Check for child unit instead of subunit
1783 if Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1785 ("expected SEPARATE subunit, found child unit",
1786 Cunit_Entity
(Unum
));
1788 -- OK, we have a subunit
1791 -- Set corresponding stub (even if errors)
1793 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1795 -- Collect SCO information for loaded subunit if we are
1796 -- in the main unit).
1800 In_Extended_Main_Source_Unit
1801 (Cunit_Entity
(Current_Sem_Unit
))
1806 -- Analyze the unit if semantics active
1808 if not Fatal_Error
(Unum
) or else Try_Semantics
then
1809 Analyze_Subunit
(Comp_Unit
);
1812 -- Set the library unit pointer in any case
1814 Set_Library_Unit
(N
, Comp_Unit
);
1816 -- We update the version. Although we are not technically
1817 -- semantically dependent on the subunit, given our
1818 -- approach of macro substitution of subunits, it makes
1819 -- sense to include it in the version identification.
1821 Version_Update
(Cunit
(Main_Unit
), Comp_Unit
);
1827 -- The remaining case is when the subunit is not already loaded and
1828 -- we are not generating code. In this case we are just performing
1829 -- semantic analysis on the parent, and we are not interested in
1830 -- the subunit. For subprograms, analyze the stub as a body. For
1831 -- other entities the stub has already been marked as completed.
1836 end Analyze_Proper_Body
;
1838 ----------------------------------
1839 -- Analyze_Protected_Body_Stub --
1840 ----------------------------------
1842 procedure Analyze_Protected_Body_Stub
(N
: Node_Id
) is
1843 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
1846 Check_Stub_Level
(N
);
1848 -- First occurrence of name may have been as an incomplete type
1850 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
1851 Nam
:= Full_View
(Nam
);
1855 or else not Is_Protected_Type
(Etype
(Nam
))
1857 Error_Msg_N
("missing specification for Protected body", N
);
1859 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1860 Set_Has_Completion
(Etype
(Nam
));
1861 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
1862 Analyze_Proper_Body
(N
, Etype
(Nam
));
1864 end Analyze_Protected_Body_Stub
;
1866 ----------------------------------
1867 -- Analyze_Subprogram_Body_Stub --
1868 ----------------------------------
1870 -- A subprogram body stub can appear with or without a previous spec. If
1871 -- there is one, then the analysis of the body will find it and verify
1872 -- conformance. The formals appearing in the specification of the stub play
1873 -- no role, except for requiring an additional conformance check. If there
1874 -- is no previous subprogram declaration, the stub acts as a spec, and
1875 -- provides the defining entity for the subprogram.
1877 procedure Analyze_Subprogram_Body_Stub
(N
: Node_Id
) is
1881 Check_Stub_Level
(N
);
1883 -- Verify that the identifier for the stub is unique within this
1884 -- declarative part.
1886 if Nkind_In
(Parent
(N
), N_Block_Statement
,
1890 Decl
:= First
(Declarations
(Parent
(N
)));
1891 while Present
(Decl
)
1894 if Nkind
(Decl
) = N_Subprogram_Body_Stub
1895 and then (Chars
(Defining_Unit_Name
(Specification
(Decl
))) =
1896 Chars
(Defining_Unit_Name
(Specification
(N
))))
1898 Error_Msg_N
("identifier for stub is not unique", N
);
1905 -- Treat stub as a body, which checks conformance if there is a previous
1906 -- declaration, or else introduces entity and its signature.
1908 Analyze_Subprogram_Body
(N
);
1909 Analyze_Proper_Body
(N
, Empty
);
1910 end Analyze_Subprogram_Body_Stub
;
1912 ---------------------
1913 -- Analyze_Subunit --
1914 ---------------------
1916 -- A subunit is compiled either by itself (for semantic checking) or as
1917 -- part of compiling the parent (for code generation). In either case, by
1918 -- the time we actually process the subunit, the parent has already been
1919 -- installed and analyzed. The node N is a compilation unit, whose context
1920 -- needs to be treated here, because we come directly here from the parent
1921 -- without calling Analyze_Compilation_Unit.
1923 -- The compilation context includes the explicit context of the subunit,
1924 -- and the context of the parent, together with the parent itself. In order
1925 -- to compile the current context, we remove the one inherited from the
1926 -- parent, in order to have a clean visibility table. We restore the parent
1927 -- context before analyzing the proper body itself. On exit, we remove only
1928 -- the explicit context of the subunit.
1930 procedure Analyze_Subunit
(N
: Node_Id
) is
1931 Lib_Unit
: constant Node_Id
:= Library_Unit
(N
);
1932 Par_Unit
: constant Entity_Id
:= Current_Scope
;
1934 Lib_Spec
: Node_Id
:= Library_Unit
(Lib_Unit
);
1935 Num_Scopes
: Int
:= 0;
1936 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
1937 Enclosing_Child
: Entity_Id
:= Empty
;
1938 Svg
: constant Suppress_Array
:= Scope_Suppress
;
1940 procedure Analyze_Subunit_Context
;
1941 -- Capture names in use clauses of the subunit. This must be done before
1942 -- re-installing parent declarations, because items in the context must
1943 -- not be hidden by declarations local to the parent.
1945 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
);
1946 -- Recursive procedure to restore scope of all ancestors of subunit,
1947 -- from outermost in. If parent is not a subunit, the call to install
1948 -- context installs context of spec and (if parent is a child unit) the
1949 -- context of its parents as well. It is confusing that parents should
1950 -- be treated differently in both cases, but the semantics are just not
1953 procedure Re_Install_Use_Clauses
;
1954 -- As part of the removal of the parent scope, the use clauses are
1955 -- removed, to be reinstalled when the context of the subunit has been
1956 -- analyzed. Use clauses may also have been affected by the analysis of
1957 -- the context of the subunit, so they have to be applied again, to
1958 -- insure that the compilation environment of the rest of the parent
1959 -- unit is identical.
1961 procedure Remove_Scope
;
1962 -- Remove current scope from scope stack, and preserve the list of use
1963 -- clauses in it, to be reinstalled after context is analyzed.
1965 -----------------------------
1966 -- Analyze_Subunit_Context --
1967 -----------------------------
1969 procedure Analyze_Subunit_Context
is
1972 Unit_Name
: Entity_Id
;
1975 Analyze_Context
(N
);
1977 -- Make withed units immediately visible. If child unit, make the
1978 -- ultimate parent immediately visible.
1980 Item
:= First
(Context_Items
(N
));
1981 while Present
(Item
) loop
1982 if Nkind
(Item
) = N_With_Clause
then
1984 -- Protect frontend against previous errors in context clauses
1986 if Nkind
(Name
(Item
)) /= N_Selected_Component
then
1987 if Error_Posted
(Item
) then
1991 Unit_Name
:= Entity
(Name
(Item
));
1992 while Is_Child_Unit
(Unit_Name
) loop
1993 Set_Is_Visible_Child_Unit
(Unit_Name
);
1994 Unit_Name
:= Scope
(Unit_Name
);
1997 if not Is_Immediately_Visible
(Unit_Name
) then
1998 Set_Is_Immediately_Visible
(Unit_Name
);
1999 Set_Context_Installed
(Item
);
2004 elsif Nkind
(Item
) = N_Use_Package_Clause
then
2005 Nam
:= First
(Names
(Item
));
2006 while Present
(Nam
) loop
2011 elsif Nkind
(Item
) = N_Use_Type_Clause
then
2012 Nam
:= First
(Subtype_Marks
(Item
));
2013 while Present
(Nam
) loop
2022 -- Reset visibility of withed units. They will be made visible again
2023 -- when we install the subunit context.
2025 Item
:= First
(Context_Items
(N
));
2026 while Present
(Item
) loop
2027 if Nkind
(Item
) = N_With_Clause
2029 -- Protect frontend against previous errors in context clauses
2031 and then Nkind
(Name
(Item
)) /= N_Selected_Component
2032 and then not Error_Posted
(Item
)
2034 Unit_Name
:= Entity
(Name
(Item
));
2035 while Is_Child_Unit
(Unit_Name
) loop
2036 Set_Is_Visible_Child_Unit
(Unit_Name
, False);
2037 Unit_Name
:= Scope
(Unit_Name
);
2040 if Context_Installed
(Item
) then
2041 Set_Is_Immediately_Visible
(Unit_Name
, False);
2042 Set_Context_Installed
(Item
, False);
2048 end Analyze_Subunit_Context
;
2050 ------------------------
2051 -- Re_Install_Parents --
2052 ------------------------
2054 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
) is
2058 if Nkind
(Unit
(L
)) = N_Subunit
then
2059 Re_Install_Parents
(Library_Unit
(L
), Scope
(Scop
));
2062 Install_Context
(L
);
2064 -- If the subunit occurs within a child unit, we must restore the
2065 -- immediate visibility of any siblings that may occur in context.
2067 if Present
(Enclosing_Child
) then
2068 Install_Siblings
(Enclosing_Child
, L
);
2073 if Scop
/= Par_Unit
then
2074 Set_Is_Immediately_Visible
(Scop
);
2077 -- Make entities in scope visible again. For child units, restore
2078 -- visibility only if they are actually in context.
2080 E
:= First_Entity
(Current_Scope
);
2081 while Present
(E
) loop
2082 if not Is_Child_Unit
(E
)
2083 or else Is_Visible_Child_Unit
(E
)
2085 Set_Is_Immediately_Visible
(E
);
2091 -- A subunit appears within a body, and for a nested subunits all the
2092 -- parents are bodies. Restore full visibility of their private
2095 if Is_Package_Or_Generic_Package
(Scop
) then
2096 Set_In_Package_Body
(Scop
);
2097 Install_Private_Declarations
(Scop
);
2099 end Re_Install_Parents
;
2101 ----------------------------
2102 -- Re_Install_Use_Clauses --
2103 ----------------------------
2105 procedure Re_Install_Use_Clauses
is
2108 for J
in reverse 1 .. Num_Scopes
loop
2109 U
:= Use_Clauses
(J
);
2110 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:= U
;
2111 Install_Use_Clauses
(U
, Force_Installation
=> True);
2113 end Re_Install_Use_Clauses
;
2119 procedure Remove_Scope
is
2123 Num_Scopes
:= Num_Scopes
+ 1;
2124 Use_Clauses
(Num_Scopes
) :=
2125 Scope_Stack
.Table
(Scope_Stack
.Last
).First_Use_Clause
;
2127 E
:= First_Entity
(Current_Scope
);
2128 while Present
(E
) loop
2129 Set_Is_Immediately_Visible
(E
, False);
2133 if Is_Child_Unit
(Current_Scope
) then
2134 Enclosing_Child
:= Current_Scope
;
2140 -- Start of processing for Analyze_Subunit
2145 Nam
: Node_Id
:= Name
(Unit
(N
));
2148 if Nkind
(Nam
) = N_Selected_Component
then
2149 Nam
:= Selector_Name
(Nam
);
2152 Check_Identifier
(Nam
, Par_Unit
);
2156 if not Is_Empty_List
(Context_Items
(N
)) then
2158 -- Save current use clauses
2161 Remove_Context
(Lib_Unit
);
2163 -- Now remove parents and their context, including enclosing subunits
2164 -- and the outer parent body which is not a subunit.
2166 if Present
(Lib_Spec
) then
2167 Remove_Context
(Lib_Spec
);
2169 while Nkind
(Unit
(Lib_Spec
)) = N_Subunit
loop
2170 Lib_Spec
:= Library_Unit
(Lib_Spec
);
2172 Remove_Context
(Lib_Spec
);
2175 if Nkind
(Unit
(Lib_Unit
)) = N_Subunit
then
2179 if Nkind
(Unit
(Lib_Spec
)) = N_Package_Body
then
2180 Remove_Context
(Library_Unit
(Lib_Spec
));
2184 Set_Is_Immediately_Visible
(Par_Unit
, False);
2186 Analyze_Subunit_Context
;
2188 Re_Install_Parents
(Lib_Unit
, Par_Unit
);
2189 Set_Is_Immediately_Visible
(Par_Unit
);
2191 -- If the context includes a child unit of the parent of the subunit,
2192 -- the parent will have been removed from visibility, after compiling
2193 -- that cousin in the context. The visibility of the parent must be
2194 -- restored now. This also applies if the context includes another
2195 -- subunit of the same parent which in turn includes a child unit in
2198 if Is_Package_Or_Generic_Package
(Par_Unit
) then
2199 if not Is_Immediately_Visible
(Par_Unit
)
2200 or else (Present
(First_Entity
(Par_Unit
))
2201 and then not Is_Immediately_Visible
2202 (First_Entity
(Par_Unit
)))
2204 Set_Is_Immediately_Visible
(Par_Unit
);
2205 Install_Visible_Declarations
(Par_Unit
);
2206 Install_Private_Declarations
(Par_Unit
);
2210 Re_Install_Use_Clauses
;
2211 Install_Context
(N
);
2213 -- Restore state of suppress flags for current body
2215 Scope_Suppress
:= Svg
;
2217 -- If the subunit is within a child unit, then siblings of any parent
2218 -- unit that appear in the context clause of the subunit must also be
2219 -- made immediately visible.
2221 if Present
(Enclosing_Child
) then
2222 Install_Siblings
(Enclosing_Child
, N
);
2226 Analyze
(Proper_Body
(Unit
(N
)));
2229 -- The subunit may contain a with_clause on a sibling of some ancestor.
2230 -- Removing the context will remove from visibility those ancestor child
2231 -- units, which must be restored to the visibility they have in the
2234 if Present
(Enclosing_Child
) then
2240 and then Is_Child_Unit
(C
)
2242 Set_Is_Immediately_Visible
(C
);
2243 Set_Is_Visible_Child_Unit
(C
);
2248 end Analyze_Subunit
;
2250 ----------------------------
2251 -- Analyze_Task_Body_Stub --
2252 ----------------------------
2254 procedure Analyze_Task_Body_Stub
(N
: Node_Id
) is
2255 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
2256 Loc
: constant Source_Ptr
:= Sloc
(N
);
2259 Check_Stub_Level
(N
);
2261 -- First occurrence of name may have been as an incomplete type
2263 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
2264 Nam
:= Full_View
(Nam
);
2267 if No
(Nam
) or else not Is_Task_Type
(Etype
(Nam
)) then
2268 Error_Msg_N
("missing specification for task body", N
);
2270 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
2271 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
2272 Set_Has_Completion
(Etype
(Nam
));
2273 Analyze_Proper_Body
(N
, Etype
(Nam
));
2275 -- Set elaboration flag to indicate that entity is callable. This
2276 -- cannot be done in the expansion of the body itself, because the
2277 -- proper body is not in a declarative part. This is only done if
2278 -- expansion is active, because the context may be generic and the
2279 -- flag not defined yet.
2281 if Expander_Active
then
2283 Make_Assignment_Statement
(Loc
,
2285 Make_Identifier
(Loc
,
2286 New_External_Name
(Chars
(Etype
(Nam
)), 'E')),
2287 Expression
=> New_Reference_To
(Standard_True
, Loc
)));
2290 end Analyze_Task_Body_Stub
;
2292 -------------------------
2293 -- Analyze_With_Clause --
2294 -------------------------
2296 -- Analyze the declaration of a unit in a with clause. At end, label the
2297 -- with clause with the defining entity for the unit.
2299 procedure Analyze_With_Clause
(N
: Node_Id
) is
2301 -- Retrieve the original kind of the unit node, before analysis. If it
2302 -- is a subprogram instantiation, its analysis below will rewrite the
2303 -- node as the declaration of the wrapper package. If the same
2304 -- instantiation appears indirectly elsewhere in the context, it will
2305 -- have been analyzed already.
2307 Unit_Kind
: constant Node_Kind
:=
2308 Nkind
(Original_Node
(Unit
(Library_Unit
(N
))));
2309 Nam
: constant Node_Id
:= Name
(N
);
2311 Par_Name
: Entity_Id
;
2316 -- Set True if the unit currently being compiled is an internal unit
2318 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
2319 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
2320 Cunit_Boolean_Restrictions_Save
;
2323 U
:= Unit
(Library_Unit
(N
));
2325 -- Several actions are skipped for dummy packages (those supplied for
2326 -- with's where no matching file could be found). Such packages are
2327 -- identified by the Sloc value being set to No_Location.
2329 if Limited_Present
(N
) then
2331 -- Ada 2005 (AI-50217): Build visibility structures but do not
2332 -- analyze the unit.
2334 if Sloc
(U
) /= No_Location
then
2335 Build_Limited_Views
(N
);
2341 -- We reset ordinary style checking during the analysis of a with'ed
2342 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2343 -- definitely *does* apply to with'ed units).
2345 if not GNAT_Mode
then
2346 Style_Check
:= False;
2349 -- If the library unit is a predefined unit, and we are in high
2350 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2351 -- for the analysis of the with'ed unit. This mode does not prevent
2352 -- explicit with'ing of run-time units.
2354 if Configurable_Run_Time_Mode
2356 Is_Predefined_File_Name
2357 (Unit_File_Name
(Get_Source_Unit
(Unit
(Library_Unit
(N
)))))
2359 Configurable_Run_Time_Mode
:= False;
2360 Semantics
(Library_Unit
(N
));
2361 Configurable_Run_Time_Mode
:= True;
2364 Semantics
(Library_Unit
(N
));
2367 Intunit
:= Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
));
2369 if Sloc
(U
) /= No_Location
then
2371 -- Check restrictions, except that we skip the check if this is an
2372 -- internal unit unless we are compiling the internal unit as the
2373 -- main unit. We also skip this for dummy packages.
2375 Check_Restriction_No_Dependence
(Nam
, N
);
2377 if not Intunit
or else Current_Sem_Unit
= Main_Unit
then
2378 Check_Restricted_Unit
(Unit_Name
(Get_Source_Unit
(U
)), N
);
2381 -- Deal with special case of GNAT.Current_Exceptions which interacts
2382 -- with the optimization of local raise statements into gotos.
2384 if Nkind
(Nam
) = N_Selected_Component
2385 and then Nkind
(Prefix
(Nam
)) = N_Identifier
2386 and then Chars
(Prefix
(Nam
)) = Name_Gnat
2387 and then (Chars
(Selector_Name
(Nam
)) = Name_Most_Recent_Exception
2389 Chars
(Selector_Name
(Nam
)) = Name_Exception_Traces
)
2391 Check_Restriction
(No_Exception_Propagation
, N
);
2392 Special_Exception_Package_Used
:= True;
2395 -- Check for inappropriate with of internal implementation unit if we
2396 -- are not compiling an internal unit. We do not issue this message
2397 -- for implicit with's generated by the compiler itself.
2399 if Implementation_Unit_Warnings
2400 and then not Intunit
2401 and then not Implicit_With
(N
)
2404 U_Kind
: constant Kind_Of_Unit
:=
2405 Get_Kind_Of_Unit
(Get_Source_Unit
(U
));
2408 if U_Kind
= Implementation_Unit
then
2409 Error_Msg_F
("& is an internal 'G'N'A'T unit?", Name
(N
));
2411 -- Add alternative name if available, otherwise issue a
2412 -- general warning message.
2414 if Error_Msg_Strlen
/= 0 then
2415 Error_Msg_F
("\use ""~"" instead", Name
(N
));
2418 ("\use of this unit is non-portable " &
2419 "and version-dependent?", Name
(N
));
2422 elsif U_Kind
= Ada_05_Unit
2423 and then Ada_Version
< Ada_05
2424 and then Warn_On_Ada_2005_Compatibility
2426 Error_Msg_N
("& is an Ada 2005 unit?", Name
(N
));
2432 -- Semantic analysis of a generic unit is performed on a copy of
2433 -- the original tree. Retrieve the entity on which semantic info
2434 -- actually appears.
2436 if Unit_Kind
in N_Generic_Declaration
then
2437 E_Name
:= Defining_Entity
(U
);
2439 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2440 -- the case of an instantiation, semantic analysis above will have
2441 -- replaced the unit by its instantiated version. If the instance body
2442 -- has been generated, the instance now denotes the body entity. For
2443 -- visibility purposes we need the entity of its spec.
2445 elsif (Unit_Kind
= N_Package_Instantiation
2446 or else Nkind
(Original_Node
(Unit
(Library_Unit
(N
)))) =
2447 N_Package_Instantiation
)
2448 and then Nkind
(U
) = N_Package_Body
2450 E_Name
:= Corresponding_Spec
(U
);
2452 elsif Unit_Kind
= N_Package_Instantiation
2453 and then Nkind
(U
) = N_Package_Instantiation
2455 -- If the instance has not been rewritten as a package declaration,
2456 -- then it appeared already in a previous with clause. Retrieve
2457 -- the entity from the previous instance.
2459 E_Name
:= Defining_Entity
(Specification
(Instance_Spec
(U
)));
2461 elsif Unit_Kind
in N_Subprogram_Instantiation
then
2463 -- The visible subprogram is created during instantiation, and is
2464 -- an attribute of the wrapper package. We retrieve the wrapper
2465 -- package directly from the instantiation node. If the instance
2466 -- is inlined the unit is still an instantiation. Otherwise it has
2467 -- been rewritten as the declaration of the wrapper itself.
2469 if Nkind
(U
) in N_Subprogram_Instantiation
then
2472 (Defining_Entity
(Specification
(Instance_Spec
(U
))));
2474 E_Name
:= Related_Instance
(Defining_Entity
(U
));
2477 elsif Unit_Kind
= N_Package_Renaming_Declaration
2478 or else Unit_Kind
in N_Generic_Renaming_Declaration
2480 E_Name
:= Defining_Entity
(U
);
2482 elsif Unit_Kind
= N_Subprogram_Body
2483 and then Nkind
(Name
(N
)) = N_Selected_Component
2484 and then not Acts_As_Spec
(Library_Unit
(N
))
2486 -- For a child unit that has no spec, one has been created and
2487 -- analyzed. The entity required is that of the spec.
2489 E_Name
:= Corresponding_Spec
(U
);
2492 E_Name
:= Defining_Entity
(U
);
2495 if Nkind
(Name
(N
)) = N_Selected_Component
then
2497 -- Child unit in a with clause
2499 Change_Selected_Component_To_Expanded_Name
(Name
(N
));
2502 -- Restore style checks and restrictions
2504 Style_Check
:= Save_Style_Check
;
2505 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
2507 -- Record the reference, but do NOT set the unit as referenced, we want
2508 -- to consider the unit as unreferenced if this is the only reference
2511 Set_Entity_With_Style_Check
(Name
(N
), E_Name
);
2512 Generate_Reference
(E_Name
, Name
(N
), 'w', Set_Ref
=> False);
2514 -- Generate references and check No_Dependence restriction for parents
2516 if Is_Child_Unit
(E_Name
) then
2517 Pref
:= Prefix
(Name
(N
));
2518 Par_Name
:= Scope
(E_Name
);
2519 while Nkind
(Pref
) = N_Selected_Component
loop
2520 Change_Selected_Component_To_Expanded_Name
(Pref
);
2521 Set_Entity_With_Style_Check
(Pref
, Par_Name
);
2523 Generate_Reference
(Par_Name
, Pref
);
2524 Check_Restriction_No_Dependence
(Pref
, N
);
2525 Pref
:= Prefix
(Pref
);
2527 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2528 -- is set to Standard_Standard, and no attempt should be made to
2529 -- further unwind scopes.
2531 if Par_Name
/= Standard_Standard
then
2532 Par_Name
:= Scope
(Par_Name
);
2536 if Present
(Entity
(Pref
))
2537 and then not Analyzed
(Parent
(Parent
(Entity
(Pref
))))
2539 -- If the entity is set without its unit being compiled, the
2540 -- original parent is a renaming, and Par_Name is the renamed
2541 -- entity. For visibility purposes, we need the original entity,
2542 -- which must be analyzed now because Load_Unit directly retrieves
2543 -- the renamed unit, and the renaming declaration itself has not
2546 Analyze
(Parent
(Parent
(Entity
(Pref
))));
2547 pragma Assert
(Renamed_Object
(Entity
(Pref
)) = Par_Name
);
2548 Par_Name
:= Entity
(Pref
);
2551 Set_Entity_With_Style_Check
(Pref
, Par_Name
);
2552 Generate_Reference
(Par_Name
, Pref
);
2555 -- If the withed unit is System, and a system extension pragma is
2556 -- present, compile the extension now, rather than waiting for a
2557 -- visibility check on a specific entity.
2559 if Chars
(E_Name
) = Name_System
2560 and then Scope
(E_Name
) = Standard_Standard
2561 and then Present
(System_Extend_Unit
)
2562 and then Present_System_Aux
(N
)
2564 -- If the extension is not present, an error will have been emitted
2569 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2570 -- to private_with units; they will be made visible later (just before
2571 -- the private part is analyzed)
2573 if Private_Present
(N
) then
2574 Set_Is_Immediately_Visible
(E_Name
, False);
2576 end Analyze_With_Clause
;
2578 ------------------------------
2579 -- Check_Private_Child_Unit --
2580 ------------------------------
2582 procedure Check_Private_Child_Unit
(N
: Node_Id
) is
2583 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2585 Curr_Unit
: Entity_Id
;
2586 Sub_Parent
: Node_Id
;
2587 Priv_Child
: Entity_Id
;
2588 Par_Lib
: Entity_Id
;
2591 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean;
2592 -- Returns true if and only if the library unit is declared with
2593 -- an explicit designation of private.
2595 -----------------------------
2596 -- Is_Private_Library_Unit --
2597 -----------------------------
2599 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean is
2600 Comp_Unit
: constant Node_Id
:= Parent
(Unit_Declaration_Node
(Unit
));
2603 return Private_Present
(Comp_Unit
);
2604 end Is_Private_Library_Unit
;
2606 -- Start of processing for Check_Private_Child_Unit
2609 if Nkind_In
(Lib_Unit
, N_Package_Body
, N_Subprogram_Body
) then
2610 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(N
)));
2611 Par_Lib
:= Curr_Unit
;
2613 elsif Nkind
(Lib_Unit
) = N_Subunit
then
2615 -- The parent is itself a body. The parent entity is to be found in
2616 -- the corresponding spec.
2618 Sub_Parent
:= Library_Unit
(N
);
2619 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(Sub_Parent
)));
2621 -- If the parent itself is a subunit, Curr_Unit is the entity
2622 -- of the enclosing body, retrieve the spec entity which is
2623 -- the proper ancestor we need for the following tests.
2625 if Ekind
(Curr_Unit
) = E_Package_Body
then
2626 Curr_Unit
:= Spec_Entity
(Curr_Unit
);
2629 Par_Lib
:= Curr_Unit
;
2632 Curr_Unit
:= Defining_Entity
(Lib_Unit
);
2634 Par_Lib
:= Curr_Unit
;
2635 Par_Spec
:= Parent_Spec
(Lib_Unit
);
2637 if No
(Par_Spec
) then
2640 Par_Lib
:= Defining_Entity
(Unit
(Par_Spec
));
2644 -- Loop through context items
2646 Item
:= First
(Context_Items
(N
));
2647 while Present
(Item
) loop
2649 -- Ada 2005 (AI-262): Allow private_with of a private child package
2650 -- in public siblings
2652 if Nkind
(Item
) = N_With_Clause
2653 and then not Implicit_With
(Item
)
2654 and then not Limited_Present
(Item
)
2655 and then Is_Private_Descendant
(Entity
(Name
(Item
)))
2657 Priv_Child
:= Entity
(Name
(Item
));
2660 Curr_Parent
: Entity_Id
:= Par_Lib
;
2661 Child_Parent
: Entity_Id
:= Scope
(Priv_Child
);
2662 Prv_Ancestor
: Entity_Id
:= Child_Parent
;
2663 Curr_Private
: Boolean := Is_Private_Library_Unit
(Curr_Unit
);
2666 -- If the child unit is a public child then locate the nearest
2667 -- private ancestor. Child_Parent will then be set to the
2668 -- parent of that ancestor.
2670 if not Is_Private_Library_Unit
(Priv_Child
) then
2671 while Present
(Prv_Ancestor
)
2672 and then not Is_Private_Library_Unit
(Prv_Ancestor
)
2674 Prv_Ancestor
:= Scope
(Prv_Ancestor
);
2677 if Present
(Prv_Ancestor
) then
2678 Child_Parent
:= Scope
(Prv_Ancestor
);
2682 while Present
(Curr_Parent
)
2683 and then Curr_Parent
/= Standard_Standard
2684 and then Curr_Parent
/= Child_Parent
2687 Curr_Private
or else Is_Private_Library_Unit
(Curr_Parent
);
2688 Curr_Parent
:= Scope
(Curr_Parent
);
2691 if No
(Curr_Parent
) then
2692 Curr_Parent
:= Standard_Standard
;
2695 if Curr_Parent
/= Child_Parent
then
2696 if Ekind
(Priv_Child
) = E_Generic_Package
2697 and then Chars
(Priv_Child
) in Text_IO_Package_Name
2698 and then Chars
(Scope
(Scope
(Priv_Child
))) = Name_Ada
2701 ("& is a nested package, not a compilation unit",
2702 Name
(Item
), Priv_Child
);
2706 ("unit in with clause is private child unit!", Item
);
2708 ("\current unit must also have parent&!",
2709 Item
, Child_Parent
);
2713 or else Private_Present
(Item
)
2714 or else Nkind_In
(Lib_Unit
, N_Package_Body
, N_Subunit
)
2715 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
2716 and then not Acts_As_Spec
(Parent
(Lib_Unit
)))
2722 ("current unit must also be private descendant of&",
2723 Item
, Child_Parent
);
2731 end Check_Private_Child_Unit
;
2733 ----------------------
2734 -- Check_Stub_Level --
2735 ----------------------
2737 procedure Check_Stub_Level
(N
: Node_Id
) is
2738 Par
: constant Node_Id
:= Parent
(N
);
2739 Kind
: constant Node_Kind
:= Nkind
(Par
);
2742 if Nkind_In
(Kind
, N_Package_Body
,
2746 and then Nkind_In
(Parent
(Par
), N_Compilation_Unit
, N_Subunit
)
2750 -- In an instance, a missing stub appears at any level. A warning
2751 -- message will have been emitted already for the missing file.
2753 elsif not In_Instance
then
2754 Error_Msg_N
("stub cannot appear in an inner scope", N
);
2756 elsif Expander_Active
then
2757 Error_Msg_N
("missing proper body", N
);
2759 end Check_Stub_Level
;
2761 ------------------------
2762 -- Expand_With_Clause --
2763 ------------------------
2765 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
) is
2766 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
2767 Ent
: constant Entity_Id
:= Entity
(Nam
);
2771 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
;
2772 -- Build name to be used in implicit with_clause. In most cases this
2773 -- is the source name, but if renamings are present we must make the
2774 -- original unit visible, not the one it renames. The entity in the
2775 -- with clause is the renamed unit, but the identifier is the one from
2776 -- the source, which allows us to recover the unit renaming.
2778 ---------------------
2779 -- Build_Unit_Name --
2780 ---------------------
2782 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
is
2784 Renaming
: Entity_Id
;
2788 if Nkind
(Nam
) = N_Identifier
then
2790 -- If the parent unit P in the name of the with_clause for P.Q
2791 -- is a renaming of package R, then the entity of the parent is
2792 -- set to R, but the identifier retains Chars (P) to be consistent
2793 -- with the source (see details in lib-load). However, the
2794 -- implicit_with_clause for the parent must make the entity for
2795 -- P visible, because P.Q may be used as a prefix within the
2796 -- current unit. The entity for P is the current_entity with that
2797 -- name, because the package renaming declaration for it has just
2798 -- been analyzed. Note that this case can only happen if P.Q has
2799 -- already appeared in a previous with_clause in a related unit,
2800 -- such as the library body of the current unit.
2802 if Chars
(Nam
) /= Chars
(Entity
(Nam
)) then
2803 Renaming
:= Current_Entity
(Nam
);
2804 pragma Assert
(Renamed_Entity
(Renaming
) = Entity
(Nam
));
2805 return New_Occurrence_Of
(Renaming
, Loc
);
2808 return New_Occurrence_Of
(Entity
(Nam
), Loc
);
2812 Ent
:= Entity
(Nam
);
2814 if Present
(Entity
(Selector_Name
(Nam
)))
2815 and then Chars
(Entity
(Selector_Name
(Nam
))) /= Chars
(Ent
)
2817 Nkind
(Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
))))
2818 = N_Package_Renaming_Declaration
2820 -- The name in the with_clause is of the form A.B.C, and B
2821 -- is given by a renaming declaration. In that case we may
2822 -- not have analyzed the unit for B, but replaced it directly
2823 -- in lib-load with the unit it renames. We have to make A.B
2824 -- visible, so analyze the declaration for B now, in case it
2825 -- has not been done yet.
2827 Ent
:= Entity
(Selector_Name
(Nam
));
2830 (Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
)))));
2834 Make_Expanded_Name
(Loc
,
2835 Chars
=> Chars
(Entity
(Nam
)),
2836 Prefix
=> Build_Unit_Name
(Prefix
(Nam
)),
2837 Selector_Name
=> New_Occurrence_Of
(Ent
, Loc
));
2838 Set_Entity
(Result
, Ent
);
2841 end Build_Unit_Name
;
2843 -- Start of processing for Expand_With_Clause
2846 New_Nodes_OK
:= New_Nodes_OK
+ 1;
2848 Make_With_Clause
(Loc
,
2849 Name
=> Build_Unit_Name
(Nam
));
2851 P
:= Parent
(Unit_Declaration_Node
(Ent
));
2852 Set_Library_Unit
(Withn
, P
);
2853 Set_Corresponding_Spec
(Withn
, Ent
);
2854 Set_First_Name
(Withn
, True);
2855 Set_Implicit_With
(Withn
, True);
2857 -- If the unit is a package declaration, a private_with_clause on a
2858 -- child unit implies the implicit with on the parent is also private.
2860 if Nkind
(Unit
(N
)) = N_Package_Declaration
then
2861 Set_Private_Present
(Withn
, Private_Present
(Item
));
2864 Prepend
(Withn
, Context_Items
(N
));
2865 Mark_Rewrite_Insertion
(Withn
);
2866 Install_Withed_Unit
(Withn
);
2868 if Nkind
(Nam
) = N_Expanded_Name
then
2869 Expand_With_Clause
(Item
, Prefix
(Nam
), N
);
2872 New_Nodes_OK
:= New_Nodes_OK
- 1;
2873 end Expand_With_Clause
;
2875 -----------------------
2876 -- Get_Parent_Entity --
2877 -----------------------
2879 function Get_Parent_Entity
(Unit
: Node_Id
) return Entity_Id
is
2881 if Nkind
(Unit
) = N_Package_Body
2882 and then Nkind
(Original_Node
(Unit
)) = N_Package_Instantiation
2884 return Defining_Entity
2885 (Specification
(Instance_Spec
(Original_Node
(Unit
))));
2886 elsif Nkind
(Unit
) = N_Package_Instantiation
then
2887 return Defining_Entity
(Specification
(Instance_Spec
(Unit
)));
2889 return Defining_Entity
(Unit
);
2891 end Get_Parent_Entity
;
2893 ---------------------
2894 -- Has_With_Clause --
2895 ---------------------
2897 function Has_With_Clause
2900 Is_Limited
: Boolean := False) return Boolean
2904 function Named_Unit
(Clause
: Node_Id
) return Entity_Id
;
2905 -- Return the entity for the unit named in a [limited] with clause
2911 function Named_Unit
(Clause
: Node_Id
) return Entity_Id
is
2913 if Nkind
(Name
(Clause
)) = N_Selected_Component
then
2914 return Entity
(Selector_Name
(Name
(Clause
)));
2916 return Entity
(Name
(Clause
));
2920 -- Start of processing for Has_With_Clause
2923 if Present
(Context_Items
(C_Unit
)) then
2924 Item
:= First
(Context_Items
(C_Unit
));
2925 while Present
(Item
) loop
2926 if Nkind
(Item
) = N_With_Clause
2927 and then Limited_Present
(Item
) = Is_Limited
2928 and then Named_Unit
(Item
) = Pack
2938 end Has_With_Clause
;
2940 -----------------------------
2941 -- Implicit_With_On_Parent --
2942 -----------------------------
2944 procedure Implicit_With_On_Parent
2945 (Child_Unit
: Node_Id
;
2948 Loc
: constant Source_Ptr
:= Sloc
(N
);
2949 P
: constant Node_Id
:= Parent_Spec
(Child_Unit
);
2950 P_Unit
: Node_Id
:= Unit
(P
);
2951 P_Name
: constant Entity_Id
:= Get_Parent_Entity
(P_Unit
);
2954 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
;
2955 -- Build prefix of child unit name. Recurse if needed
2957 function Build_Unit_Name
return Node_Id
;
2958 -- If the unit is a child unit, build qualified name with all ancestors
2960 -------------------------
2961 -- Build_Ancestor_Name --
2962 -------------------------
2964 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
is
2965 P_Ref
: constant Node_Id
:=
2966 New_Reference_To
(Defining_Entity
(P
), Loc
);
2967 P_Spec
: Node_Id
:= P
;
2970 -- Ancestor may have been rewritten as a package body. Retrieve
2971 -- the original spec to trace earlier ancestors.
2973 if Nkind
(P
) = N_Package_Body
2974 and then Nkind
(Original_Node
(P
)) = N_Package_Instantiation
2976 P_Spec
:= Original_Node
(P
);
2979 if No
(Parent_Spec
(P_Spec
)) then
2983 Make_Selected_Component
(Loc
,
2984 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Spec
))),
2985 Selector_Name
=> P_Ref
);
2987 end Build_Ancestor_Name
;
2989 ---------------------
2990 -- Build_Unit_Name --
2991 ---------------------
2993 function Build_Unit_Name
return Node_Id
is
2997 if No
(Parent_Spec
(P_Unit
)) then
2998 return New_Reference_To
(P_Name
, Loc
);
3002 Make_Expanded_Name
(Loc
,
3003 Chars
=> Chars
(P_Name
),
3004 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Unit
))),
3005 Selector_Name
=> New_Reference_To
(P_Name
, Loc
));
3006 Set_Entity
(Result
, P_Name
);
3009 end Build_Unit_Name
;
3011 -- Start of processing for Implicit_With_On_Parent
3014 -- The unit of the current compilation may be a package body that
3015 -- replaces an instance node. In this case we need the original instance
3016 -- node to construct the proper parent name.
3018 if Nkind
(P_Unit
) = N_Package_Body
3019 and then Nkind
(Original_Node
(P_Unit
)) = N_Package_Instantiation
3021 P_Unit
:= Original_Node
(P_Unit
);
3024 -- We add the implicit with if the child unit is the current unit being
3025 -- compiled. If the current unit is a body, we do not want to add an
3026 -- implicit_with a second time to the corresponding spec.
3028 if Nkind
(Child_Unit
) = N_Package_Declaration
3029 and then Child_Unit
/= Unit
(Cunit
(Current_Sem_Unit
))
3034 New_Nodes_OK
:= New_Nodes_OK
+ 1;
3035 Withn
:= Make_With_Clause
(Loc
, Name
=> Build_Unit_Name
);
3037 Set_Library_Unit
(Withn
, P
);
3038 Set_Corresponding_Spec
(Withn
, P_Name
);
3039 Set_First_Name
(Withn
, True);
3040 Set_Implicit_With
(Withn
, True);
3042 -- Node is placed at the beginning of the context items, so that
3043 -- subsequent use clauses on the parent can be validated.
3045 Prepend
(Withn
, Context_Items
(N
));
3046 Mark_Rewrite_Insertion
(Withn
);
3047 Install_Withed_Unit
(Withn
);
3049 if Is_Child_Spec
(P_Unit
) then
3050 Implicit_With_On_Parent
(P_Unit
, N
);
3053 New_Nodes_OK
:= New_Nodes_OK
- 1;
3054 end Implicit_With_On_Parent
;
3060 function In_Chain
(E
: Entity_Id
) return Boolean is
3064 H
:= Current_Entity
(E
);
3065 while Present
(H
) loop
3076 ---------------------
3077 -- Install_Context --
3078 ---------------------
3080 procedure Install_Context
(N
: Node_Id
) is
3081 Lib_Unit
: constant Node_Id
:= Unit
(N
);
3084 Install_Context_Clauses
(N
);
3086 if Is_Child_Spec
(Lib_Unit
) then
3087 Install_Parents
(Lib_Unit
, Private_Present
(Parent
(Lib_Unit
)));
3090 Install_Limited_Context_Clauses
(N
);
3091 end Install_Context
;
3093 -----------------------------
3094 -- Install_Context_Clauses --
3095 -----------------------------
3097 procedure Install_Context_Clauses
(N
: Node_Id
) is
3098 Lib_Unit
: constant Node_Id
:= Unit
(N
);
3100 Uname_Node
: Entity_Id
;
3101 Check_Private
: Boolean := False;
3102 Decl_Node
: Node_Id
;
3103 Lib_Parent
: Entity_Id
;
3106 -- First skip configuration pragmas at the start of the context. They
3107 -- are not technically part of the context clause, but that's where the
3108 -- parser puts them. Note they were analyzed in Analyze_Context.
3110 Item
:= First
(Context_Items
(N
));
3111 while Present
(Item
)
3112 and then Nkind
(Item
) = N_Pragma
3113 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
3118 -- Loop through the actual context clause items. We process everything
3119 -- except Limited_With clauses in this routine. Limited_With clauses
3120 -- are separately installed (see Install_Limited_Context_Clauses).
3122 while Present
(Item
) loop
3124 -- Case of explicit WITH clause
3126 if Nkind
(Item
) = N_With_Clause
3127 and then not Implicit_With
(Item
)
3129 if Limited_Present
(Item
) then
3131 -- Limited withed units will be installed later
3135 -- If Name (Item) is not an entity name, something is wrong, and
3136 -- this will be detected in due course, for now ignore the item
3138 elsif not Is_Entity_Name
(Name
(Item
)) then
3141 elsif No
(Entity
(Name
(Item
))) then
3142 Set_Entity
(Name
(Item
), Any_Id
);
3146 Uname_Node
:= Entity
(Name
(Item
));
3148 if Is_Private_Descendant
(Uname_Node
) then
3149 Check_Private
:= True;
3152 Install_Withed_Unit
(Item
);
3154 Decl_Node
:= Unit_Declaration_Node
(Uname_Node
);
3156 -- If the unit is a subprogram instance, it appears nested within
3157 -- a package that carries the parent information.
3159 if Is_Generic_Instance
(Uname_Node
)
3160 and then Ekind
(Uname_Node
) /= E_Package
3162 Decl_Node
:= Parent
(Parent
(Decl_Node
));
3165 if Is_Child_Spec
(Decl_Node
) then
3166 if Nkind
(Name
(Item
)) = N_Expanded_Name
then
3167 Expand_With_Clause
(Item
, Prefix
(Name
(Item
)), N
);
3169 -- If not an expanded name, the child unit must be a
3170 -- renaming, nothing to do.
3175 elsif Nkind
(Decl_Node
) = N_Subprogram_Body
3176 and then not Acts_As_Spec
(Parent
(Decl_Node
))
3177 and then Is_Child_Spec
(Unit
(Library_Unit
(Parent
(Decl_Node
))))
3179 Implicit_With_On_Parent
3180 (Unit
(Library_Unit
(Parent
(Decl_Node
))), N
);
3183 -- Check license conditions unless this is a dummy unit
3185 if Sloc
(Library_Unit
(Item
)) /= No_Location
then
3186 License_Check
: declare
3187 Withu
: constant Unit_Number_Type
:=
3188 Get_Source_Unit
(Library_Unit
(Item
));
3189 Withl
: constant License_Type
:=
3190 License
(Source_Index
(Withu
));
3191 Unitl
: constant License_Type
:=
3192 License
(Source_Index
(Current_Sem_Unit
));
3194 procedure License_Error
;
3195 -- Signal error of bad license
3201 procedure License_Error
is
3204 ("?license of with'ed unit & may be inconsistent",
3208 -- Start of processing for License_Check
3211 -- Exclude license check if withed unit is an internal unit.
3212 -- This situation arises e.g. with the GPL version of GNAT.
3214 if Is_Internal_File_Name
(Unit_File_Name
(Withu
)) then
3217 -- Otherwise check various cases
3229 if Withl
= Restricted
then
3233 when Modified_GPL
=>
3234 if Withl
= Restricted
or else Withl
= GPL
then
3238 when Unrestricted
=>
3245 -- Case of USE PACKAGE clause
3247 elsif Nkind
(Item
) = N_Use_Package_Clause
then
3248 Analyze_Use_Package
(Item
);
3250 -- Case of USE TYPE clause
3252 elsif Nkind
(Item
) = N_Use_Type_Clause
then
3253 Analyze_Use_Type
(Item
);
3257 elsif Nkind
(Item
) = N_Pragma
then
3265 if Is_Child_Spec
(Lib_Unit
) then
3267 -- The unit also has implicit with_clauses on its own parents
3269 if No
(Context_Items
(N
)) then
3270 Set_Context_Items
(N
, New_List
);
3273 Implicit_With_On_Parent
(Lib_Unit
, N
);
3276 -- If the unit is a body, the context of the specification must also
3277 -- be installed. That includes private with_clauses in that context.
3279 if Nkind
(Lib_Unit
) = N_Package_Body
3280 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
3281 and then not Acts_As_Spec
(N
))
3283 Install_Context
(Library_Unit
(N
));
3285 -- Only install private with-clauses of a spec that comes from
3286 -- source, excluding specs created for a subprogram body that is
3289 if Comes_From_Source
(Library_Unit
(N
)) then
3290 Install_Private_With_Clauses
3291 (Defining_Entity
(Unit
(Library_Unit
(N
))));
3294 if Is_Child_Spec
(Unit
(Library_Unit
(N
))) then
3296 -- If the unit is the body of a public child unit, the private
3297 -- declarations of the parent must be made visible. If the child
3298 -- unit is private, the private declarations have been installed
3299 -- already in the call to Install_Parents for the spec. Installing
3300 -- private declarations must be done for all ancestors of public
3301 -- child units. In addition, sibling units mentioned in the
3302 -- context clause of the body are directly visible.
3310 Lib_Spec
:= Unit
(Library_Unit
(N
));
3311 while Is_Child_Spec
(Lib_Spec
) loop
3312 P
:= Unit
(Parent_Spec
(Lib_Spec
));
3313 P_Name
:= Defining_Entity
(P
);
3315 if not (Private_Present
(Parent
(Lib_Spec
)))
3316 and then not In_Private_Part
(P_Name
)
3318 Install_Private_Declarations
(P_Name
);
3319 Install_Private_With_Clauses
(P_Name
);
3320 Set_Use
(Private_Declarations
(Specification
(P
)));
3328 -- For a package body, children in context are immediately visible
3330 Install_Siblings
(Defining_Entity
(Unit
(Library_Unit
(N
))), N
);
3333 if Nkind_In
(Lib_Unit
, N_Generic_Package_Declaration
,
3334 N_Generic_Subprogram_Declaration
,
3335 N_Package_Declaration
,
3336 N_Subprogram_Declaration
)
3338 if Is_Child_Spec
(Lib_Unit
) then
3339 Lib_Parent
:= Defining_Entity
(Unit
(Parent_Spec
(Lib_Unit
)));
3340 Set_Is_Private_Descendant
3341 (Defining_Entity
(Lib_Unit
),
3342 Is_Private_Descendant
(Lib_Parent
)
3343 or else Private_Present
(Parent
(Lib_Unit
)));
3346 Set_Is_Private_Descendant
3347 (Defining_Entity
(Lib_Unit
),
3348 Private_Present
(Parent
(Lib_Unit
)));
3352 if Check_Private
then
3353 Check_Private_Child_Unit
(N
);
3355 end Install_Context_Clauses
;
3357 -------------------------------------
3358 -- Install_Limited_Context_Clauses --
3359 -------------------------------------
3361 procedure Install_Limited_Context_Clauses
(N
: Node_Id
) is
3364 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
);
3365 -- Check that the unlimited view of a given compilation_unit is not
3366 -- already visible through "use + renamings".
3368 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
);
3369 -- Check that if a limited_with clause of a given compilation_unit
3370 -- mentions a descendant of a private child of some library unit, then
3371 -- the given compilation_unit shall be the declaration of a private
3372 -- descendant of that library unit, or a public descendant of such. The
3373 -- code is analogous to that of Check_Private_Child_Unit but we cannot
3374 -- use entities on the limited with_clauses because their units have not
3375 -- been analyzed, so we have to climb the tree of ancestors looking for
3376 -- private keywords.
3378 procedure Expand_Limited_With_Clause
3379 (Comp_Unit
: Node_Id
;
3382 -- If a child unit appears in a limited_with clause, there are implicit
3383 -- limited_with clauses on all parents that are not already visible
3384 -- through a regular with clause. This procedure creates the implicit
3385 -- limited with_clauses for the parents and loads the corresponding
3386 -- units. The shadow entities are created when the inserted clause is
3387 -- analyzed. Implements Ada 2005 (AI-50217).
3389 function Is_Ancestor_Unit
(U1
: Node_Id
; U2
: Node_Id
) return Boolean;
3390 -- When compiling a unit Q descended from some parent unit P, a limited
3391 -- with_clause in the context of P that names some other ancestor of Q
3392 -- must not be installed because the ancestor is immediately visible.
3394 ---------------------
3395 -- Check_Renamings --
3396 ---------------------
3398 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
) is
3407 pragma Assert
(Nkind
(W
) = N_With_Clause
);
3409 -- Protect the frontend against previous critical errors
3411 case Nkind
(Unit
(Library_Unit
(W
))) is
3412 when N_Subprogram_Declaration |
3413 N_Package_Declaration |
3414 N_Generic_Subprogram_Declaration |
3415 N_Generic_Package_Declaration
=>
3422 -- Check "use + renamings"
3424 WEnt
:= Defining_Unit_Name
(Specification
(Unit
(Library_Unit
(W
))));
3425 Spec
:= Specification
(Unit
(P
));
3427 Item
:= First
(Visible_Declarations
(Spec
));
3428 while Present
(Item
) loop
3430 -- Look only at use package clauses
3432 if Nkind
(Item
) = N_Use_Package_Clause
then
3434 -- Traverse the list of packages
3436 Nam
:= First
(Names
(Item
));
3437 while Present
(Nam
) loop
3440 pragma Assert
(Present
(Parent
(E
)));
3442 if Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
3443 and then Renamed_Entity
(E
) = WEnt
3445 -- The unlimited view is visible through use clause and
3446 -- renamings. There is no need to generate the error
3447 -- message here because Is_Visible_Through_Renamings
3448 -- takes care of generating the precise error message.
3452 elsif Nkind
(Parent
(E
)) = N_Package_Specification
then
3454 -- The use clause may refer to a local package.
3455 -- Check all the enclosing scopes.
3458 while E2
/= Standard_Standard
3466 ("unlimited view visible through use clause ", W
);
3478 -- Recursive call to check all the ancestors
3480 if Is_Child_Spec
(Unit
(P
)) then
3481 Check_Renamings
(P
=> Parent_Spec
(Unit
(P
)), W
=> W
);
3483 end Check_Renamings
;
3485 ---------------------------------------
3486 -- Check_Private_Limited_Withed_Unit --
3487 ---------------------------------------
3489 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
) is
3490 Curr_Parent
: Node_Id
;
3491 Child_Parent
: Node_Id
;
3492 Curr_Private
: Boolean;
3495 -- Compilation unit of the parent of the withed library unit
3497 Child_Parent
:= Library_Unit
(Item
);
3499 -- If the child unit is a public child, then locate its nearest
3500 -- private ancestor, if any, then Child_Parent will then be set to
3501 -- the parent of that ancestor.
3503 if not Private_Present
(Library_Unit
(Item
)) then
3504 while Present
(Child_Parent
)
3505 and then not Private_Present
(Child_Parent
)
3507 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3510 if No
(Child_Parent
) then
3515 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3517 -- Traverse all the ancestors of the current compilation unit to
3518 -- check if it is a descendant of named library unit.
3520 Curr_Parent
:= Parent
(Item
);
3521 Curr_Private
:= Private_Present
(Curr_Parent
);
3523 while Present
(Parent_Spec
(Unit
(Curr_Parent
)))
3524 and then Curr_Parent
/= Child_Parent
3526 Curr_Parent
:= Parent_Spec
(Unit
(Curr_Parent
));
3527 Curr_Private
:= Curr_Private
or else Private_Present
(Curr_Parent
);
3530 if Curr_Parent
/= Child_Parent
then
3532 ("unit in with clause is private child unit!", Item
);
3534 ("\current unit must also have parent&!",
3535 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3537 elsif Private_Present
(Parent
(Item
))
3538 or else Curr_Private
3539 or else Private_Present
(Item
)
3540 or else Nkind_In
(Unit
(Parent
(Item
)), N_Package_Body
,
3544 -- Current unit is private, of descendant of a private unit
3550 ("current unit must also be private descendant of&",
3551 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3553 end Check_Private_Limited_Withed_Unit
;
3555 --------------------------------
3556 -- Expand_Limited_With_Clause --
3557 --------------------------------
3559 procedure Expand_Limited_With_Clause
3560 (Comp_Unit
: Node_Id
;
3564 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
3565 Unum
: Unit_Number_Type
;
3568 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean;
3569 -- Returns true if the context already includes a with_clause for
3570 -- this unit. If the with_clause is non-limited, the unit is fully
3571 -- visible and an implicit limited_with should not be created. If
3572 -- there is already a limited_with clause for W, a second one is
3573 -- simply redundant.
3575 --------------------------
3576 -- Previous_Withed_Unit --
3577 --------------------------
3579 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean is
3583 -- A limited with_clause cannot appear in the same context_clause
3584 -- as a nonlimited with_clause which mentions the same library.
3586 Item
:= First
(Context_Items
(Comp_Unit
));
3587 while Present
(Item
) loop
3588 if Nkind
(Item
) = N_With_Clause
3589 and then Library_Unit
(Item
) = Library_Unit
(W
)
3598 end Previous_Withed_Unit
;
3600 -- Start of processing for Expand_Limited_With_Clause
3603 New_Nodes_OK
:= New_Nodes_OK
+ 1;
3605 if Nkind
(Nam
) = N_Identifier
then
3607 -- Create node for name of withed unit
3610 Make_With_Clause
(Loc
,
3611 Name
=> New_Copy
(Nam
));
3613 else pragma Assert
(Nkind
(Nam
) = N_Selected_Component
);
3615 Make_With_Clause
(Loc
,
3616 Name
=> Make_Selected_Component
(Loc
,
3617 Prefix
=> New_Copy_Tree
(Prefix
(Nam
)),
3618 Selector_Name
=> New_Copy
(Selector_Name
(Nam
))));
3619 Set_Parent
(Withn
, Parent
(N
));
3622 Set_Limited_Present
(Withn
);
3623 Set_First_Name
(Withn
);
3624 Set_Implicit_With
(Withn
);
3628 (Load_Name
=> Get_Spec_Name
(Get_Unit_Name
(Nam
)),
3633 -- Do not generate a limited_with_clause on the current unit.
3634 -- This path is taken when a unit has a limited_with clause on
3635 -- one of its child units.
3637 if Unum
= Current_Sem_Unit
then
3641 Set_Library_Unit
(Withn
, Cunit
(Unum
));
3642 Set_Corresponding_Spec
3643 (Withn
, Specification
(Unit
(Cunit
(Unum
))));
3645 if not Previous_Withed_Unit
(Withn
) then
3646 Prepend
(Withn
, Context_Items
(Parent
(N
)));
3647 Mark_Rewrite_Insertion
(Withn
);
3649 -- Add implicit limited_with_clauses for parents of child units
3650 -- mentioned in limited_with clauses.
3652 if Nkind
(Nam
) = N_Selected_Component
then
3653 Expand_Limited_With_Clause
(Comp_Unit
, Prefix
(Nam
), N
);
3658 if not Limited_View_Installed
(Withn
) then
3659 Install_Limited_Withed_Unit
(Withn
);
3663 New_Nodes_OK
:= New_Nodes_OK
- 1;
3664 end Expand_Limited_With_Clause
;
3666 ----------------------
3667 -- Is_Ancestor_Unit --
3668 ----------------------
3670 function Is_Ancestor_Unit
(U1
: Node_Id
; U2
: Node_Id
) return Boolean is
3671 E1
: constant Entity_Id
:= Defining_Entity
(Unit
(U1
));
3674 if Nkind_In
(Unit
(U2
), N_Package_Body
, N_Subprogram_Body
) then
3675 E2
:= Defining_Entity
(Unit
(Library_Unit
(U2
)));
3676 return Is_Ancestor_Package
(E1
, E2
);
3680 end Is_Ancestor_Unit
;
3682 -- Start of processing for Install_Limited_Context_Clauses
3685 Item
:= First
(Context_Items
(N
));
3686 while Present
(Item
) loop
3687 if Nkind
(Item
) = N_With_Clause
3688 and then Limited_Present
(Item
)
3690 if Nkind
(Name
(Item
)) = N_Selected_Component
then
3691 Expand_Limited_With_Clause
3692 (Comp_Unit
=> N
, Nam
=> Prefix
(Name
(Item
)), N
=> Item
);
3695 Check_Private_Limited_Withed_Unit
(Item
);
3697 if not Implicit_With
(Item
)
3698 and then Is_Child_Spec
(Unit
(N
))
3700 Check_Renamings
(Parent_Spec
(Unit
(N
)), Item
);
3703 -- A unit may have a limited with on itself if it has a limited
3704 -- with_clause on one of its child units. In that case it is
3705 -- already being compiled and it makes no sense to install its
3708 -- If the item is a limited_private_with_clause, install it if the
3709 -- current unit is a body or if it is a private child. Otherwise
3710 -- the private clause is installed before analyzing the private
3711 -- part of the current unit.
3713 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
)
3714 and then not Limited_View_Installed
(Item
)
3716 not Is_Ancestor_Unit
3717 (Library_Unit
(Item
), Cunit
(Current_Sem_Unit
))
3719 if not Private_Present
(Item
)
3720 or else Private_Present
(N
)
3721 or else Nkind_In
(Unit
(N
), N_Package_Body
,
3725 Install_Limited_Withed_Unit
(Item
);
3733 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3734 -- spec, looking for incomplete subtype declarations of incomplete types
3735 -- visible through a limited with clause.
3737 if Ada_Version
>= Ada_05
3738 and then Analyzed
(N
)
3739 and then Nkind
(Unit
(N
)) = N_Package_Declaration
3744 Non_Lim_View
: Entity_Id
;
3747 Decl
:= First
(Visible_Declarations
(Specification
(Unit
(N
))));
3748 while Present
(Decl
) loop
3749 if Nkind
(Decl
) = N_Subtype_Declaration
3751 Ekind
(Defining_Identifier
(Decl
)) = E_Incomplete_Subtype
3753 From_With_Type
(Defining_Identifier
(Decl
))
3755 Def_Id
:= Defining_Identifier
(Decl
);
3756 Non_Lim_View
:= Non_Limited_View
(Def_Id
);
3758 if not Is_Incomplete_Type
(Non_Lim_View
) then
3760 -- Convert an incomplete subtype declaration into a
3761 -- corresponding non-limited view subtype declaration.
3762 -- This is usually the case when analyzing a body that
3763 -- has regular with-clauses, when the spec has limited
3766 -- If the non-limited view is still incomplete, it is
3767 -- the dummy entry already created, and the declaration
3768 -- cannot be reanalyzed. This is the case when installing
3769 -- a parent unit that has limited with-clauses.
3771 Set_Subtype_Indication
(Decl
,
3772 New_Reference_To
(Non_Lim_View
, Sloc
(Def_Id
)));
3773 Set_Etype
(Def_Id
, Non_Lim_View
);
3774 Set_Ekind
(Def_Id
, Subtype_Kind
(Ekind
(Non_Lim_View
)));
3775 Set_Analyzed
(Decl
, False);
3777 -- Reanalyze the declaration, suppressing the call to
3778 -- Enter_Name to avoid duplicate names.
3780 Analyze_Subtype_Declaration
3790 end Install_Limited_Context_Clauses
;
3792 ---------------------
3793 -- Install_Parents --
3794 ---------------------
3796 procedure Install_Parents
(Lib_Unit
: Node_Id
; Is_Private
: Boolean) is
3803 P
:= Unit
(Parent_Spec
(Lib_Unit
));
3804 P_Name
:= Get_Parent_Entity
(P
);
3806 if Etype
(P_Name
) = Any_Type
then
3810 if Ekind
(P_Name
) = E_Generic_Package
3811 and then not Nkind_In
(Lib_Unit
, N_Generic_Subprogram_Declaration
,
3812 N_Generic_Package_Declaration
)
3813 and then Nkind
(Lib_Unit
) not in N_Generic_Renaming_Declaration
3816 ("child of a generic package must be a generic unit", Lib_Unit
);
3818 elsif not Is_Package_Or_Generic_Package
(P_Name
) then
3820 ("parent unit must be package or generic package", Lib_Unit
);
3821 raise Unrecoverable_Error
;
3823 elsif Present
(Renamed_Object
(P_Name
)) then
3824 Error_Msg_N
("parent unit cannot be a renaming", Lib_Unit
);
3825 raise Unrecoverable_Error
;
3827 -- Verify that a child of an instance is itself an instance, or the
3828 -- renaming of one. Given that an instance that is a unit is replaced
3829 -- with a package declaration, check against the original node. The
3830 -- parent may be currently being instantiated, in which case it appears
3831 -- as a declaration, but the generic_parent is already established
3832 -- indicating that we deal with an instance.
3834 elsif Nkind
(Original_Node
(P
)) = N_Package_Instantiation
then
3835 if Nkind
(Lib_Unit
) in N_Renaming_Declaration
3836 or else Nkind
(Original_Node
(Lib_Unit
)) in N_Generic_Instantiation
3838 (Nkind
(Lib_Unit
) = N_Package_Declaration
3839 and then Present
(Generic_Parent
(Specification
(Lib_Unit
))))
3844 ("child of an instance must be an instance or renaming",
3849 -- This is the recursive call that ensures all parents are loaded
3851 if Is_Child_Spec
(P
) then
3853 Is_Private
or else Private_Present
(Parent
(Lib_Unit
)));
3856 -- Now we can install the context for this parent
3858 Install_Context_Clauses
(Parent_Spec
(Lib_Unit
));
3859 Install_Limited_Context_Clauses
(Parent_Spec
(Lib_Unit
));
3860 Install_Siblings
(P_Name
, Parent
(Lib_Unit
));
3862 -- The child unit is in the declarative region of the parent. The parent
3863 -- must therefore appear in the scope stack and be visible, as when
3864 -- compiling the corresponding body. If the child unit is private or it
3865 -- is a package body, private declarations must be accessible as well.
3866 -- Use declarations in the parent must also be installed. Finally, other
3867 -- child units of the same parent that are in the context are
3868 -- immediately visible.
3870 -- Find entity for compilation unit, and set its private descendant
3871 -- status as needed. Indicate that it is a compilation unit, which is
3872 -- redundant in general, but needed if this is a generated child spec
3873 -- for a child body without previous spec.
3875 E_Name
:= Defining_Entity
(Lib_Unit
);
3877 Set_Is_Child_Unit
(E_Name
);
3878 Set_Is_Compilation_Unit
(E_Name
);
3880 Set_Is_Private_Descendant
(E_Name
,
3881 Is_Private_Descendant
(P_Name
)
3882 or else Private_Present
(Parent
(Lib_Unit
)));
3884 P_Spec
:= Specification
(Unit_Declaration_Node
(P_Name
));
3885 Push_Scope
(P_Name
);
3887 -- Save current visibility of unit
3889 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
:=
3890 Is_Immediately_Visible
(P_Name
);
3891 Set_Is_Immediately_Visible
(P_Name
);
3892 Install_Visible_Declarations
(P_Name
);
3893 Set_Use
(Visible_Declarations
(P_Spec
));
3895 -- If the parent is a generic unit, its formal part may contain formal
3896 -- packages and use clauses for them.
3898 if Ekind
(P_Name
) = E_Generic_Package
then
3899 Set_Use
(Generic_Formal_Declarations
(Parent
(P_Spec
)));
3903 or else Private_Present
(Parent
(Lib_Unit
))
3905 Install_Private_Declarations
(P_Name
);
3906 Install_Private_With_Clauses
(P_Name
);
3907 Set_Use
(Private_Declarations
(P_Spec
));
3909 end Install_Parents
;
3911 ----------------------------------
3912 -- Install_Private_With_Clauses --
3913 ----------------------------------
3915 procedure Install_Private_With_Clauses
(P
: Entity_Id
) is
3916 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
3920 if Debug_Flag_I
then
3921 Write_Str
("install private with clauses of ");
3922 Write_Name
(Chars
(P
));
3926 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
3927 Item
:= First
(Context_Items
(Parent
(Decl
)));
3928 while Present
(Item
) loop
3929 if Nkind
(Item
) = N_With_Clause
3930 and then Private_Present
(Item
)
3932 if Limited_Present
(Item
) then
3933 if not Limited_View_Installed
(Item
) then
3934 Install_Limited_Withed_Unit
(Item
);
3937 Install_Withed_Unit
(Item
, Private_With_OK
=> True);
3944 end Install_Private_With_Clauses
;
3946 ----------------------
3947 -- Install_Siblings --
3948 ----------------------
3950 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
) is
3956 -- Iterate over explicit with clauses, and check whether the scope of
3957 -- each entity is an ancestor of the current unit, in which case it is
3958 -- immediately visible.
3960 Item
:= First
(Context_Items
(N
));
3961 while Present
(Item
) loop
3963 -- Do not install private_with_clauses declaration, unless unit
3964 -- is itself a private child unit, or is a body. Note that for a
3965 -- subprogram body the private_with_clause does not take effect until
3966 -- after the specification.
3968 if Nkind
(Item
) /= N_With_Clause
3969 or else Implicit_With
(Item
)
3970 or else Limited_Present
(Item
)
3974 elsif not Private_Present
(Item
)
3975 or else Private_Present
(N
)
3976 or else Nkind
(Unit
(N
)) = N_Package_Body
3978 Id
:= Entity
(Name
(Item
));
3980 if Is_Child_Unit
(Id
)
3981 and then Is_Ancestor_Package
(Scope
(Id
), U_Name
)
3983 Set_Is_Immediately_Visible
(Id
);
3985 -- Check for the presence of another unit in the context that
3986 -- may be inadvertently hidden by the child.
3988 Prev
:= Current_Entity
(Id
);
3991 and then Is_Immediately_Visible
(Prev
)
3992 and then not Is_Child_Unit
(Prev
)
3998 Clause
:= First
(Context_Items
(N
));
3999 while Present
(Clause
) loop
4000 if Nkind
(Clause
) = N_With_Clause
4001 and then Entity
(Name
(Clause
)) = Prev
4004 ("child unit& hides compilation unit " &
4005 "with the same name?",
4015 -- The With_Clause may be on a grand-child or one of its further
4016 -- descendants, which makes a child immediately visible. Examine
4017 -- ancestry to determine whether such a child exists. For example,
4018 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
4019 -- is immediately visible.
4021 elsif Is_Child_Unit
(Id
) then
4027 while Is_Child_Unit
(Par
) loop
4028 if Is_Ancestor_Package
(Scope
(Par
), U_Name
) then
4029 Set_Is_Immediately_Visible
(Par
);
4038 -- If the item is a private with-clause on a child unit, the parent
4039 -- may have been installed already, but the child unit must remain
4040 -- invisible until installed in a private part or body, unless there
4041 -- is already a regular with_clause for it in the current unit.
4043 elsif Private_Present
(Item
) then
4044 Id
:= Entity
(Name
(Item
));
4046 if Is_Child_Unit
(Id
) then
4050 function In_Context
return Boolean;
4051 -- Scan context of current unit, to check whether there is
4052 -- a with_clause on the same unit as a private with-clause
4053 -- on a parent, in which case child unit is visible. If the
4054 -- unit is a grand-child, the same applies to its parent.
4060 function In_Context
return Boolean is
4063 First
(Context_Items
(Cunit
(Current_Sem_Unit
)));
4064 while Present
(Clause
) loop
4065 if Nkind
(Clause
) = N_With_Clause
4066 and then Comes_From_Source
(Clause
)
4067 and then Is_Entity_Name
(Name
(Clause
))
4068 and then not Private_Present
(Clause
)
4070 if Entity
(Name
(Clause
)) = Id
4072 (Nkind
(Name
(Clause
)) = N_Expanded_Name
4073 and then Entity
(Prefix
(Name
(Clause
))) = Id
)
4086 Set_Is_Visible_Child_Unit
(Id
, In_Context
);
4093 end Install_Siblings
;
4095 ---------------------------------
4096 -- Install_Limited_Withed_Unit --
4097 ---------------------------------
4099 procedure Install_Limited_Withed_Unit
(N
: Node_Id
) is
4100 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
4103 Is_Child_Package
: Boolean := False;
4104 Lim_Header
: Entity_Id
;
4105 Lim_Typ
: Entity_Id
;
4107 procedure Check_Body_Required
;
4108 -- A unit mentioned in a limited with_clause may not be mentioned in
4109 -- a regular with_clause, but must still be included in the current
4110 -- partition. We need to determine whether the unit needs a body, so
4111 -- that the binder can determine the name of the file to be compiled.
4112 -- Checking whether a unit needs a body can be done without semantic
4113 -- analysis, by examining the nature of the declarations in the package.
4115 function Has_Limited_With_Clause
4116 (C_Unit
: Entity_Id
;
4117 Pack
: Entity_Id
) return Boolean;
4118 -- Determine whether any package in the ancestor chain starting with
4119 -- C_Unit has a limited with clause for package Pack.
4121 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean;
4122 -- Check if some package installed though normal with-clauses has a
4123 -- renaming declaration of package P. AARM 10.1.2(21/2).
4125 -------------------------
4126 -- Check_Body_Required --
4127 -------------------------
4129 procedure Check_Body_Required
is
4130 PA
: constant List_Id
:=
4131 Pragmas_After
(Aux_Decls_Node
(Parent
(P_Unit
)));
4133 procedure Check_Declarations
(Spec
: Node_Id
);
4134 -- Recursive procedure that does the work and checks nested packages
4136 ------------------------
4137 -- Check_Declarations --
4138 ------------------------
4140 procedure Check_Declarations
(Spec
: Node_Id
) is
4142 Incomplete_Decls
: constant Elist_Id
:= New_Elmt_List
;
4144 Subp_List
: constant Elist_Id
:= New_Elmt_List
;
4146 procedure Check_Pragma_Import
(P
: Node_Id
);
4147 -- If a pragma import applies to a previous subprogram, the
4148 -- enclosing unit may not need a body. The processing is syntactic
4149 -- and does not require a declaration to be analyzed. The code
4150 -- below also handles pragma Import when applied to a subprogram
4151 -- that renames another. In this case the pragma applies to the
4154 -- Chains of multiple renames are not handled by the code below.
4155 -- It is probably impossible to handle all cases without proper
4156 -- name resolution. In such cases the algorithm is conservative
4157 -- and will indicate that a body is needed???
4159 -------------------------
4160 -- Check_Pragma_Import --
4161 -------------------------
4163 procedure Check_Pragma_Import
(P
: Node_Id
) is
4169 procedure Remove_Homonyms
(E
: Node_Id
);
4170 -- Make one pass over list of subprograms. Called again if
4171 -- subprogram is a renaming. E is known to be an identifier.
4173 ---------------------
4174 -- Remove_Homonyms --
4175 ---------------------
4177 procedure Remove_Homonyms
(E
: Node_Id
) is
4178 R
: Entity_Id
:= Empty
;
4179 -- Name of renamed entity, if any
4182 Subp_Id
:= First_Elmt
(Subp_List
);
4183 while Present
(Subp_Id
) loop
4184 if Chars
(Node
(Subp_Id
)) = Chars
(E
) then
4185 if Nkind
(Parent
(Parent
(Node
(Subp_Id
))))
4186 /= N_Subprogram_Renaming_Declaration
4189 Next_Elmt
(Subp_Id
);
4190 Remove_Elmt
(Subp_List
, Prev_Id
);
4192 R
:= Name
(Parent
(Parent
(Node
(Subp_Id
))));
4196 Next_Elmt
(Subp_Id
);
4201 if Nkind
(R
) = N_Identifier
then
4202 Remove_Homonyms
(R
);
4204 elsif Nkind
(R
) = N_Selected_Component
then
4205 Remove_Homonyms
(Selector_Name
(R
));
4207 -- Renaming of attribute
4213 end Remove_Homonyms
;
4215 -- Start of processing for Check_Pragma_Import
4218 -- Find name of entity in Import pragma. We have not analyzed
4219 -- the construct, so we must guard against syntax errors.
4221 Arg
:= Next
(First
(Pragma_Argument_Associations
(P
)));
4224 or else Nkind
(Expression
(Arg
)) /= N_Identifier
4228 Imported
:= Expression
(Arg
);
4231 Remove_Homonyms
(Imported
);
4232 end Check_Pragma_Import
;
4234 -- Start of processing for Check_Declarations
4237 -- Search for Elaborate Body pragma
4239 Decl
:= First
(Visible_Declarations
(Spec
));
4240 while Present
(Decl
)
4241 and then Nkind
(Decl
) = N_Pragma
4243 if Get_Pragma_Id
(Decl
) = Pragma_Elaborate_Body
then
4244 Set_Body_Required
(Library_Unit
(N
));
4251 -- Look for declarations that require the presence of a body. We
4252 -- have already skipped pragmas at the start of the list.
4254 while Present
(Decl
) loop
4256 -- Subprogram that comes from source means body may be needed.
4257 -- Save for subsequent examination of import pragmas.
4259 if Comes_From_Source
(Decl
)
4260 and then (Nkind_In
(Decl
, N_Subprogram_Declaration
,
4261 N_Subprogram_Renaming_Declaration
,
4262 N_Generic_Subprogram_Declaration
))
4264 Append_Elmt
(Defining_Entity
(Decl
), Subp_List
);
4266 -- Package declaration of generic package declaration. We need
4267 -- to recursively examine nested declarations.
4269 elsif Nkind_In
(Decl
, N_Package_Declaration
,
4270 N_Generic_Package_Declaration
)
4272 Check_Declarations
(Specification
(Decl
));
4274 elsif Nkind
(Decl
) = N_Pragma
4275 and then Pragma_Name
(Decl
) = Name_Import
4277 Check_Pragma_Import
(Decl
);
4283 -- Same set of tests for private part. In addition to subprograms
4284 -- detect the presence of Taft Amendment types (incomplete types
4285 -- completed in the body).
4287 Decl
:= First
(Private_Declarations
(Spec
));
4288 while Present
(Decl
) loop
4289 if Comes_From_Source
(Decl
)
4290 and then (Nkind_In
(Decl
, N_Subprogram_Declaration
,
4291 N_Subprogram_Renaming_Declaration
,
4292 N_Generic_Subprogram_Declaration
))
4294 Append_Elmt
(Defining_Entity
(Decl
), Subp_List
);
4296 elsif Nkind_In
(Decl
, N_Package_Declaration
,
4297 N_Generic_Package_Declaration
)
4299 Check_Declarations
(Specification
(Decl
));
4301 -- Collect incomplete type declarations for separate pass
4303 elsif Nkind
(Decl
) = N_Incomplete_Type_Declaration
then
4304 Append_Elmt
(Decl
, Incomplete_Decls
);
4306 elsif Nkind
(Decl
) = N_Pragma
4307 and then Pragma_Name
(Decl
) = Name_Import
4309 Check_Pragma_Import
(Decl
);
4315 -- Now check incomplete declarations to locate Taft amendment
4316 -- types. This can be done by examining the defining identifiers
4317 -- of type declarations without real semantic analysis.
4323 Inc
:= First_Elmt
(Incomplete_Decls
);
4324 while Present
(Inc
) loop
4325 Decl
:= Next
(Node
(Inc
));
4326 while Present
(Decl
) loop
4327 if Nkind
(Decl
) = N_Full_Type_Declaration
4328 and then Chars
(Defining_Identifier
(Decl
)) =
4329 Chars
(Defining_Identifier
(Node
(Inc
)))
4337 -- If no completion, this is a TAT, and a body is needed
4340 Set_Body_Required
(Library_Unit
(N
));
4348 -- Finally, check whether there are subprograms that still
4349 -- require a body, i.e. are not renamings or null.
4351 if not Is_Empty_Elmt_List
(Subp_List
) then
4357 Subp_Id
:= First_Elmt
(Subp_List
);
4358 Spec
:= Parent
(Node
(Subp_Id
));
4360 while Present
(Subp_Id
) loop
4361 if Nkind
(Parent
(Spec
))
4362 = N_Subprogram_Renaming_Declaration
4366 elsif Nkind
(Spec
) = N_Procedure_Specification
4367 and then Null_Present
(Spec
)
4372 Set_Body_Required
(Library_Unit
(N
));
4376 Next_Elmt
(Subp_Id
);
4380 end Check_Declarations
;
4382 -- Start of processing for Check_Body_Required
4385 -- If this is an imported package (Java and CIL usage) no body is
4386 -- needed. Scan list of pragmas that may follow a compilation unit
4387 -- to look for a relevant pragma Import.
4389 if Present
(PA
) then
4395 while Present
(Prag
) loop
4396 if Nkind
(Prag
) = N_Pragma
4397 and then Get_Pragma_Id
(Prag
) = Pragma_Import
4407 Check_Declarations
(Specification
(P_Unit
));
4408 end Check_Body_Required
;
4410 -----------------------------
4411 -- Has_Limited_With_Clause --
4412 -----------------------------
4414 function Has_Limited_With_Clause
4415 (C_Unit
: Entity_Id
;
4416 Pack
: Entity_Id
) return Boolean
4423 while Present
(Par
) loop
4424 if Ekind
(Par
) /= E_Package
then
4428 -- Retrieve the Compilation_Unit node for Par and determine if
4429 -- its context clauses contain a limited with for Pack.
4431 Par_Unit
:= Parent
(Parent
(Parent
(Par
)));
4433 if Nkind
(Par_Unit
) = N_Package_Declaration
then
4434 Par_Unit
:= Parent
(Par_Unit
);
4437 if Has_With_Clause
(Par_Unit
, Pack
, True) then
4441 -- If there are more ancestors, climb up the tree, otherwise
4444 if Is_Child_Unit
(Par
) then
4452 end Has_Limited_With_Clause
;
4454 ----------------------------------
4455 -- Is_Visible_Through_Renamings --
4456 ----------------------------------
4458 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean is
4459 Kind
: constant Node_Kind
:=
4460 Nkind
(Unit
(Cunit
(Current_Sem_Unit
)));
4466 -- Example of the error detected by this subprogram:
4474 -- package Ren_P renames P;
4480 -- limited with P; -- ERROR
4481 -- package R.C is ...
4483 Aux_Unit
:= Cunit
(Current_Sem_Unit
);
4486 Item
:= First
(Context_Items
(Aux_Unit
));
4487 while Present
(Item
) loop
4488 if Nkind
(Item
) = N_With_Clause
4489 and then not Limited_Present
(Item
)
4490 and then Nkind
(Unit
(Library_Unit
(Item
))) =
4491 N_Package_Declaration
4494 First
(Visible_Declarations
4495 (Specification
(Unit
(Library_Unit
(Item
)))));
4496 while Present
(Decl
) loop
4497 if Nkind
(Decl
) = N_Package_Renaming_Declaration
4498 and then Entity
(Name
(Decl
)) = P
4500 -- Generate the error message only if the current unit
4501 -- is a package declaration; in case of subprogram
4502 -- bodies and package bodies we just return True to
4503 -- indicate that the limited view must not be
4506 if Kind
= N_Package_Declaration
then
4508 ("simultaneous visibility of the limited and " &
4509 "unlimited views not allowed", N
);
4510 Error_Msg_Sloc
:= Sloc
(Item
);
4512 ("\\ unlimited view of & visible through the " &
4513 "context clause #", N
, P
);
4514 Error_Msg_Sloc
:= Sloc
(Decl
);
4515 Error_Msg_NE
("\\ and the renaming #", N
, P
);
4528 -- If it is a body not acting as spec, follow pointer to the
4529 -- corresponding spec, otherwise follow pointer to parent spec.
4531 if Present
(Library_Unit
(Aux_Unit
))
4532 and then Nkind_In
(Unit
(Aux_Unit
),
4533 N_Package_Body
, N_Subprogram_Body
)
4535 if Aux_Unit
= Library_Unit
(Aux_Unit
) then
4537 -- Aux_Unit is a body that acts as a spec. Clause has
4538 -- already been flagged as illegal.
4543 Aux_Unit
:= Library_Unit
(Aux_Unit
);
4547 Aux_Unit
:= Parent_Spec
(Unit
(Aux_Unit
));
4550 exit when No
(Aux_Unit
);
4554 end Is_Visible_Through_Renamings
;
4556 -- Start of processing for Install_Limited_Withed_Unit
4559 pragma Assert
(not Limited_View_Installed
(N
));
4561 -- In case of limited with_clause on subprograms, generics, instances,
4562 -- or renamings, the corresponding error was previously posted and we
4563 -- have nothing to do here. If the file is missing altogether, it has
4564 -- no source location.
4566 if Nkind
(P_Unit
) /= N_Package_Declaration
4567 or else Sloc
(P_Unit
) = No_Location
4572 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
4574 -- Handle child packages
4576 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
4577 Is_Child_Package
:= True;
4578 P
:= Defining_Identifier
(P
);
4581 -- Do not install the limited-view if the context of the unit is already
4582 -- available through a regular with clause.
4584 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4585 and then Has_With_Clause
(Cunit
(Current_Sem_Unit
), P
)
4590 -- Do not install the limited-view if the full-view is already visible
4591 -- through renaming declarations.
4593 if Is_Visible_Through_Renamings
(P
) then
4597 -- Do not install the limited view if this is the unit being analyzed.
4598 -- This unusual case will happen when a unit has a limited_with clause
4599 -- on one of its children. The compilation of the child forces the
4600 -- load of the parent which tries to install the limited view of the
4601 -- child again. Installing the limited view must also be disabled
4602 -- when compiling the body of the child unit.
4604 if P
= Cunit_Entity
(Current_Sem_Unit
)
4606 (Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4607 and then P
= Main_Unit_Entity
)
4612 -- This scenario is similar to the one above, the difference is that
4613 -- the compilation of sibling Par.Sib forces the load of parent Par
4614 -- which tries to install the limited view of Lim_Pack [1]. However
4615 -- Par.Sib has a with clause for Lim_Pack [2] in its body, and thus
4616 -- needs the non-limited views of all entities from Lim_Pack.
4618 -- limited with Lim_Pack; -- [1]
4619 -- package Par is ... package Lim_Pack is ...
4621 -- with Lim_Pack; -- [2]
4622 -- package Par.Sib is ... package body Par.Sib is ...
4624 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4625 -- Sem_Unit is the body of Par.Sib.
4627 if Ekind
(P
) = E_Package
4628 and then Ekind
(Main_Unit_Entity
) = E_Package
4629 and then Is_Child_Unit
(Main_Unit_Entity
)
4631 -- The body has a regular with clause
4633 and then Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4634 and then Has_With_Clause
(Cunit
(Current_Sem_Unit
), P
)
4636 -- One of the ancestors has a limited with clause
4638 and then Nkind
(Parent
(Parent
(Main_Unit_Entity
))) =
4639 N_Package_Specification
4640 and then Has_Limited_With_Clause
(Scope
(Main_Unit_Entity
), P
)
4645 -- A common use of the limited-with is to have a limited-with
4646 -- in the package spec, and a normal with in its package body.
4649 -- limited with X; -- [1]
4653 -- package body A is ...
4655 -- The compilation of A's body installs the context clauses found at [2]
4656 -- and then the context clauses of its specification (found at [1]). As
4657 -- a consequence, at [1] the specification of X has been analyzed and it
4658 -- is immediately visible. According to the semantics of limited-with
4659 -- context clauses we don't install the limited view because the full
4660 -- view of X supersedes its limited view.
4662 if Analyzed
(P_Unit
)
4664 (Is_Immediately_Visible
(P
)
4665 or else (Is_Child_Package
and then Is_Visible_Child_Unit
(P
)))
4670 if Debug_Flag_I
then
4671 Write_Str
("install limited view of ");
4672 Write_Name
(Chars
(P
));
4676 -- If the unit has not been analyzed and the limited view has not been
4677 -- already installed then we install it.
4679 if not Analyzed
(P_Unit
) then
4680 if not In_Chain
(P
) then
4682 -- Minimum decoration
4684 Set_Ekind
(P
, E_Package
);
4685 Set_Etype
(P
, Standard_Void_Type
);
4686 Set_Scope
(P
, Standard_Standard
);
4688 if Is_Child_Package
then
4689 Set_Is_Child_Unit
(P
);
4690 Set_Is_Visible_Child_Unit
(P
);
4691 Set_Scope
(P
, Defining_Entity
(Unit
(Parent_Spec
(P_Unit
))));
4694 -- Place entity on visibility structure
4696 Set_Homonym
(P
, Current_Entity
(P
));
4697 Set_Current_Entity
(P
);
4699 if Debug_Flag_I
then
4700 Write_Str
(" (homonym) chain ");
4701 Write_Name
(Chars
(P
));
4705 -- Install the incomplete view. The first element of the limited
4706 -- view is a header (an E_Package entity) used to reference the
4707 -- first shadow entity in the private part of the package.
4709 Lim_Header
:= Limited_View
(P
);
4710 Lim_Typ
:= First_Entity
(Lim_Header
);
4712 while Present
(Lim_Typ
)
4713 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
4715 Set_Homonym
(Lim_Typ
, Current_Entity
(Lim_Typ
));
4716 Set_Current_Entity
(Lim_Typ
);
4718 if Debug_Flag_I
then
4719 Write_Str
(" (homonym) chain ");
4720 Write_Name
(Chars
(Lim_Typ
));
4724 Next_Entity
(Lim_Typ
);
4728 -- If the unit appears in a previous regular with_clause, the regular
4729 -- entities of the public part of the withed package must be replaced
4730 -- by the shadow ones.
4732 -- This code must be kept synchronized with the code that replaces the
4733 -- shadow entities by the real entities (see body of Remove_Limited
4734 -- With_Clause); otherwise the contents of the homonym chains are not
4738 -- Hide all the type entities of the public part of the package to
4739 -- avoid its usage. This is needed to cover all the subtype decla-
4740 -- rations because we do not remove them from the homonym chain.
4742 E
:= First_Entity
(P
);
4743 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
4745 Set_Was_Hidden
(E
, Is_Hidden
(E
));
4752 -- Replace the real entities by the shadow entities of the limited
4753 -- view. The first element of the limited view is a header that is
4754 -- used to reference the first shadow entity in the private part
4755 -- of the package. Successive elements are the limited views of the
4756 -- type (including regular incomplete types) declared in the package.
4758 Lim_Header
:= Limited_View
(P
);
4760 Lim_Typ
:= First_Entity
(Lim_Header
);
4761 while Present
(Lim_Typ
)
4762 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
4764 pragma Assert
(not In_Chain
(Lim_Typ
));
4766 -- Do not unchain nested packages and child units
4768 if Ekind
(Lim_Typ
) /= E_Package
4769 and then not Is_Child_Unit
(Lim_Typ
)
4775 Prev
:= Current_Entity
(Lim_Typ
);
4778 -- Replace E in the homonyms list, so that the limited
4779 -- view becomes available.
4781 if E
= Non_Limited_View
(Lim_Typ
) then
4782 Set_Homonym
(Lim_Typ
, Homonym
(Prev
));
4783 Set_Current_Entity
(Lim_Typ
);
4787 E
:= Homonym
(Prev
);
4789 -- E may have been removed when installing a
4790 -- previous limited_with_clause.
4794 exit when E
= Non_Limited_View
(Lim_Typ
);
4796 Prev
:= Homonym
(Prev
);
4800 Set_Homonym
(Lim_Typ
, Homonym
(Homonym
(Prev
)));
4801 Set_Homonym
(Prev
, Lim_Typ
);
4806 if Debug_Flag_I
then
4807 Write_Str
(" (homonym) chain ");
4808 Write_Name
(Chars
(Lim_Typ
));
4813 Next_Entity
(Lim_Typ
);
4817 -- The package must be visible while the limited-with clause is active
4818 -- because references to the type P.T must resolve in the usual way.
4819 -- In addition, we remember that the limited-view has been installed to
4820 -- uninstall it at the point of context removal.
4822 Set_Is_Immediately_Visible
(P
);
4823 Set_Limited_View_Installed
(N
);
4825 -- If unit has not been analyzed in some previous context, check
4826 -- (imperfectly ???) whether it might need a body.
4828 if not Analyzed
(P_Unit
) then
4829 Check_Body_Required
;
4832 -- If the package in the limited_with clause is a child unit, the
4833 -- clause is unanalyzed and appears as a selected component. Recast
4834 -- it as an expanded name so that the entity can be properly set. Use
4835 -- entity of parent, if available, for higher ancestors in the name.
4837 if Nkind
(Name
(N
)) = N_Selected_Component
then
4845 while Nkind
(Nam
) = N_Selected_Component
4846 and then Present
(Ent
)
4848 Change_Selected_Component_To_Expanded_Name
(Nam
);
4850 -- Set entity of parent identifiers if the unit is a child
4851 -- unit. This ensures that the tree is properly formed from
4852 -- semantic point of view (e.g. for ASIS queries).
4854 Set_Entity
(Nam
, Ent
);
4856 Nam
:= Prefix
(Nam
);
4859 -- Set entity of last ancestor
4861 if Nkind
(Nam
) = N_Identifier
then
4862 Set_Entity
(Nam
, Ent
);
4868 Set_Entity
(Name
(N
), P
);
4869 Set_From_With_Type
(P
);
4870 end Install_Limited_Withed_Unit
;
4872 -------------------------
4873 -- Install_Withed_Unit --
4874 -------------------------
4876 procedure Install_Withed_Unit
4877 (With_Clause
: Node_Id
;
4878 Private_With_OK
: Boolean := False)
4880 Uname
: constant Entity_Id
:= Entity
(Name
(With_Clause
));
4881 P
: constant Entity_Id
:= Scope
(Uname
);
4884 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4885 -- compiling a package declaration and the Private_With_OK flag was not
4886 -- set by the caller. These declarations will be installed later (before
4887 -- analyzing the private part of the package).
4889 if Private_Present
(With_Clause
)
4890 and then Nkind
(Unit
(Parent
(With_Clause
))) = N_Package_Declaration
4891 and then not (Private_With_OK
)
4896 if Debug_Flag_I
then
4897 if Private_Present
(With_Clause
) then
4898 Write_Str
("install private withed unit ");
4900 Write_Str
("install withed unit ");
4903 Write_Name
(Chars
(Uname
));
4907 -- We do not apply the restrictions to an internal unit unless we are
4908 -- compiling the internal unit as a main unit. This check is also
4909 -- skipped for dummy units (for missing packages).
4911 if Sloc
(Uname
) /= No_Location
4912 and then (not Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
))
4913 or else Current_Sem_Unit
= Main_Unit
)
4915 Check_Restricted_Unit
4916 (Unit_Name
(Get_Source_Unit
(Uname
)), With_Clause
);
4919 if P
/= Standard_Standard
then
4921 -- If the unit is not analyzed after analysis of the with clause and
4922 -- it is an instantiation then it awaits a body and is the main unit.
4923 -- Its appearance in the context of some other unit indicates a
4924 -- circular dependency (DEC suite perversity).
4926 if not Analyzed
(Uname
)
4927 and then Nkind
(Parent
(Uname
)) = N_Package_Instantiation
4930 ("instantiation depends on itself", Name
(With_Clause
));
4932 elsif not Is_Visible_Child_Unit
(Uname
) then
4933 Set_Is_Visible_Child_Unit
(Uname
);
4935 -- If the child unit appears in the context of its parent, it is
4936 -- immediately visible.
4938 if In_Open_Scopes
(Scope
(Uname
)) then
4939 Set_Is_Immediately_Visible
(Uname
);
4942 if Is_Generic_Instance
(Uname
)
4943 and then Ekind
(Uname
) in Subprogram_Kind
4945 -- Set flag as well on the visible entity that denotes the
4946 -- instance, which renames the current one.
4948 Set_Is_Visible_Child_Unit
4950 (Defining_Entity
(Unit
(Library_Unit
(With_Clause
)))));
4953 -- The parent unit may have been installed already, and may have
4954 -- appeared in a use clause.
4956 if In_Use
(Scope
(Uname
)) then
4957 Set_Is_Potentially_Use_Visible
(Uname
);
4960 Set_Context_Installed
(With_Clause
);
4963 elsif not Is_Immediately_Visible
(Uname
) then
4964 if not Private_Present
(With_Clause
)
4965 or else Private_With_OK
4967 Set_Is_Immediately_Visible
(Uname
);
4970 Set_Context_Installed
(With_Clause
);
4973 -- A with-clause overrides a with-type clause: there are no restric-
4974 -- tions on the use of package entities.
4976 if Ekind
(Uname
) = E_Package
then
4977 Set_From_With_Type
(Uname
, False);
4980 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4981 -- unit if there is a visible homograph for it declared in the same
4982 -- declarative region. This pathological case can only arise when an
4983 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4984 -- G1 has a generic child also named G2, and the context includes with_
4985 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4986 -- of I1.G2 visible as well. If the child unit is named Standard, do
4987 -- not apply the check to the Standard package itself.
4989 if Is_Child_Unit
(Uname
)
4990 and then Is_Visible_Child_Unit
(Uname
)
4991 and then Ada_Version
>= Ada_05
4994 Decl1
: constant Node_Id
:= Unit_Declaration_Node
(P
);
5000 U2
:= Homonym
(Uname
);
5002 and then U2
/= Standard_Standard
5005 Decl2
:= Unit_Declaration_Node
(P2
);
5007 if Is_Child_Unit
(U2
)
5008 and then Is_Visible_Child_Unit
(U2
)
5010 if Is_Generic_Instance
(P
)
5011 and then Nkind
(Decl1
) = N_Package_Declaration
5012 and then Generic_Parent
(Specification
(Decl1
)) = P2
5014 Error_Msg_N
("illegal with_clause", With_Clause
);
5016 ("\child unit has visible homograph" &
5017 " (RM 8.3(26), 10.1.1(19))",
5021 elsif Is_Generic_Instance
(P2
)
5022 and then Nkind
(Decl2
) = N_Package_Declaration
5023 and then Generic_Parent
(Specification
(Decl2
)) = P
5025 -- With_clause for child unit of instance appears before
5026 -- in the context. We want to place the error message on
5027 -- it, not on the generic child unit itself.
5030 Prev_Clause
: Node_Id
;
5033 Prev_Clause
:= First
(List_Containing
(With_Clause
));
5034 while Entity
(Name
(Prev_Clause
)) /= U2
loop
5038 pragma Assert
(Present
(Prev_Clause
));
5039 Error_Msg_N
("illegal with_clause", Prev_Clause
);
5041 ("\child unit has visible homograph" &
5042 " (RM 8.3(26), 10.1.1(19))",
5053 end Install_Withed_Unit
;
5059 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean is
5060 K
: constant Node_Kind
:= Nkind
(Lib_Unit
);
5063 return (K
in N_Generic_Declaration
or else
5064 K
in N_Generic_Instantiation
or else
5065 K
in N_Generic_Renaming_Declaration
or else
5066 K
= N_Package_Declaration
or else
5067 K
= N_Package_Renaming_Declaration
or else
5068 K
= N_Subprogram_Declaration
or else
5069 K
= N_Subprogram_Renaming_Declaration
)
5070 and then Present
(Parent_Spec
(Lib_Unit
));
5073 ------------------------------------
5074 -- Is_Legal_Shadow_Entity_In_Body --
5075 ------------------------------------
5077 function Is_Legal_Shadow_Entity_In_Body
(T
: Entity_Id
) return Boolean is
5078 C_Unit
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
5080 return Nkind
(Unit
(C_Unit
)) = N_Package_Body
5083 (C_Unit
, Cunit_Entity
(Get_Source_Unit
(Non_Limited_View
(T
))));
5084 end Is_Legal_Shadow_Entity_In_Body
;
5086 -----------------------
5087 -- Load_Needed_Body --
5088 -----------------------
5090 -- N is a generic unit named in a with clause, or else it is a unit that
5091 -- contains a generic unit or an inlined function. In order to perform an
5092 -- instantiation, the body of the unit must be present. If the unit itself
5093 -- is generic, we assume that an instantiation follows, and load & analyze
5094 -- the body unconditionally. This forces analysis of the spec as well.
5096 -- If the unit is not generic, but contains a generic unit, it is loaded on
5097 -- demand, at the point of instantiation (see ch12).
5099 procedure Load_Needed_Body
(N
: Node_Id
; OK
: out Boolean) is
5100 Body_Name
: Unit_Name_Type
;
5101 Unum
: Unit_Number_Type
;
5103 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
5104 -- The loading and analysis is done with style checks off
5107 if not GNAT_Mode
then
5108 Style_Check
:= False;
5111 Body_Name
:= Get_Body_Name
(Get_Unit_Name
(Unit
(N
)));
5114 (Load_Name
=> Body_Name
,
5120 if Unum
= No_Unit
then
5124 Compiler_State
:= Analyzing
; -- reset after load
5126 if not Fatal_Error
(Unum
) or else Try_Semantics
then
5127 if Debug_Flag_L
then
5128 Write_Str
("*** Loaded generic body");
5132 Semantics
(Cunit
(Unum
));
5138 Style_Check
:= Save_Style_Check
;
5139 end Load_Needed_Body
;
5141 -------------------------
5142 -- Build_Limited_Views --
5143 -------------------------
5145 procedure Build_Limited_Views
(N
: Node_Id
) is
5146 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Library_Unit
(N
));
5147 P
: constant Entity_Id
:= Cunit_Entity
(Unum
);
5149 Spec
: Node_Id
; -- To denote a package specification
5150 Lim_Typ
: Entity_Id
; -- To denote shadow entities
5151 Comp_Typ
: Entity_Id
; -- To denote real entities
5153 Lim_Header
: Entity_Id
; -- Package entity
5154 Last_Lim_E
: Entity_Id
:= Empty
; -- Last limited entity built
5155 Last_Pub_Lim_E
: Entity_Id
; -- To set the first private entity
5157 procedure Decorate_Incomplete_Type
(E
: Entity_Id
; Scop
: Entity_Id
);
5158 -- Add attributes of an incomplete type to a shadow entity. The same
5159 -- attributes are placed on the real entity, so that gigi receives
5160 -- a consistent view.
5162 procedure Decorate_Package_Specification
(P
: Entity_Id
);
5163 -- Add attributes of a package entity to the entity in a package
5166 procedure Decorate_Tagged_Type
5170 -- Set basic attributes of tagged type T, including its class_wide type.
5171 -- The parameters Loc, Scope are used to decorate the class_wide type.
5173 procedure Build_Chain
(Scope
: Entity_Id
; First_Decl
: Node_Id
);
5174 -- Construct list of shadow entities and attach it to entity of
5175 -- package that is mentioned in a limited_with clause.
5177 function New_Internal_Shadow_Entity
5178 (Kind
: Entity_Kind
;
5179 Sloc_Value
: Source_Ptr
;
5180 Id_Char
: Character) return Entity_Id
;
5181 -- Build a new internal entity and append it to the list of shadow
5182 -- entities available through the limited-header
5188 procedure Build_Chain
(Scope
: Entity_Id
; First_Decl
: Node_Id
) is
5189 Analyzed_Unit
: constant Boolean := Analyzed
(Cunit
(Unum
));
5190 Is_Tagged
: Boolean;
5195 while Present
(Decl
) loop
5197 -- For each library_package_declaration in the environment, there
5198 -- is an implicit declaration of a *limited view* of that library
5199 -- package. The limited view of a package contains:
5201 -- * For each nested package_declaration, a declaration of the
5202 -- limited view of that package, with the same defining-
5203 -- program-unit name.
5205 -- * For each type_declaration in the visible part, an incomplete
5206 -- type-declaration with the same defining_identifier, whose
5207 -- completion is the type_declaration. If the type_declaration
5208 -- is tagged, then the incomplete_type_declaration is tagged
5211 -- The partial view is tagged if the declaration has the
5212 -- explicit keyword, or else if it is a type extension, both
5213 -- of which can be ascertained syntactically.
5215 if Nkind
(Decl
) = N_Full_Type_Declaration
then
5217 (Nkind
(Type_Definition
(Decl
)) = N_Record_Definition
5218 and then Tagged_Present
(Type_Definition
(Decl
)))
5220 (Nkind
(Type_Definition
(Decl
)) = N_Derived_Type_Definition
5223 (Record_Extension_Part
(Type_Definition
(Decl
))));
5225 Comp_Typ
:= Defining_Identifier
(Decl
);
5227 if not Analyzed_Unit
then
5229 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5231 Decorate_Incomplete_Type
(Comp_Typ
, Scope
);
5235 -- Create shadow entity for type
5238 New_Internal_Shadow_Entity
5239 (Kind
=> Ekind
(Comp_Typ
),
5240 Sloc_Value
=> Sloc
(Comp_Typ
),
5243 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5244 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5245 Set_From_With_Type
(Lim_Typ
);
5248 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5250 Decorate_Incomplete_Type
(Lim_Typ
, Scope
);
5253 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5255 elsif Nkind_In
(Decl
, N_Private_Type_Declaration
,
5256 N_Incomplete_Type_Declaration
,
5257 N_Task_Type_Declaration
,
5258 N_Protected_Type_Declaration
)
5260 Comp_Typ
:= Defining_Identifier
(Decl
);
5263 Nkind_In
(Decl
, N_Private_Type_Declaration
,
5264 N_Incomplete_Type_Declaration
)
5265 and then Tagged_Present
(Decl
);
5267 if not Analyzed_Unit
then
5269 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5271 Decorate_Incomplete_Type
(Comp_Typ
, Scope
);
5276 New_Internal_Shadow_Entity
5277 (Kind
=> Ekind
(Comp_Typ
),
5278 Sloc_Value
=> Sloc
(Comp_Typ
),
5281 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5282 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5283 Set_From_With_Type
(Lim_Typ
);
5286 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5288 Decorate_Incomplete_Type
(Lim_Typ
, Scope
);
5291 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5293 elsif Nkind
(Decl
) = N_Private_Extension_Declaration
then
5294 Comp_Typ
:= Defining_Identifier
(Decl
);
5296 if not Analyzed_Unit
then
5297 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5300 -- Create shadow entity for type
5303 New_Internal_Shadow_Entity
5304 (Kind
=> Ekind
(Comp_Typ
),
5305 Sloc_Value
=> Sloc
(Comp_Typ
),
5308 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5309 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5310 Set_From_With_Type
(Lim_Typ
);
5312 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5313 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5315 elsif Nkind
(Decl
) = N_Package_Declaration
then
5320 Spec
: constant Node_Id
:= Specification
(Decl
);
5323 Comp_Typ
:= Defining_Unit_Name
(Spec
);
5325 if not Analyzed
(Cunit
(Unum
)) then
5326 Decorate_Package_Specification
(Comp_Typ
);
5327 Set_Scope
(Comp_Typ
, Scope
);
5331 New_Internal_Shadow_Entity
5332 (Kind
=> Ekind
(Comp_Typ
),
5333 Sloc_Value
=> Sloc
(Comp_Typ
),
5336 Decorate_Package_Specification
(Lim_Typ
);
5337 Set_Scope
(Lim_Typ
, Scope
);
5339 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5340 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5341 Set_From_With_Type
(Lim_Typ
);
5343 -- Note: The non_limited_view attribute is not used
5344 -- for local packages.
5348 First_Decl
=> First
(Visible_Declarations
(Spec
)));
5356 ------------------------------
5357 -- Decorate_Incomplete_Type --
5358 ------------------------------
5360 procedure Decorate_Incomplete_Type
(E
: Entity_Id
; Scop
: Entity_Id
) is
5362 Set_Ekind
(E
, E_Incomplete_Type
);
5363 Set_Scope
(E
, Scop
);
5365 Set_Is_First_Subtype
(E
, True);
5366 Set_Stored_Constraint
(E
, No_Elist
);
5367 Set_Full_View
(E
, Empty
);
5368 Init_Size_Align
(E
);
5369 end Decorate_Incomplete_Type
;
5371 --------------------------
5372 -- Decorate_Tagged_Type --
5373 --------------------------
5375 procedure Decorate_Tagged_Type
5383 Decorate_Incomplete_Type
(T
, Scop
);
5384 Set_Is_Tagged_Type
(T
);
5386 -- Build corresponding class_wide type, if not previously done
5388 -- Note: The class-wide entity is shared by the limited-view
5389 -- and the full-view.
5391 if No
(Class_Wide_Type
(T
)) then
5392 CW
:= Make_Temporary
(Loc
, 'S');
5394 -- Set parent to be the same as the parent of the tagged type.
5395 -- We need a parent field set, and it is supposed to point to
5396 -- the declaration of the type. The tagged type declaration
5397 -- essentially declares two separate types, the tagged type
5398 -- itself and the corresponding class-wide type, so it is
5399 -- reasonable for the parent fields to point to the declaration
5402 Set_Parent
(CW
, Parent
(T
));
5404 -- Set remaining fields of classwide type
5406 Set_Ekind
(CW
, E_Class_Wide_Type
);
5408 Set_Scope
(CW
, Scop
);
5409 Set_Is_Tagged_Type
(CW
);
5410 Set_Is_First_Subtype
(CW
, True);
5411 Init_Size_Align
(CW
);
5412 Set_Has_Unknown_Discriminants
(CW
, True);
5413 Set_Class_Wide_Type
(CW
, CW
);
5414 Set_Equivalent_Type
(CW
, Empty
);
5415 Set_From_With_Type
(CW
, From_With_Type
(T
));
5417 -- Link type to its class-wide type
5419 Set_Class_Wide_Type
(T
, CW
);
5421 end Decorate_Tagged_Type
;
5423 ------------------------------------
5424 -- Decorate_Package_Specification --
5425 ------------------------------------
5427 procedure Decorate_Package_Specification
(P
: Entity_Id
) is
5429 -- Place only the most basic attributes
5431 Set_Ekind
(P
, E_Package
);
5432 Set_Etype
(P
, Standard_Void_Type
);
5433 end Decorate_Package_Specification
;
5435 --------------------------------
5436 -- New_Internal_Shadow_Entity --
5437 --------------------------------
5439 function New_Internal_Shadow_Entity
5440 (Kind
: Entity_Kind
;
5441 Sloc_Value
: Source_Ptr
;
5442 Id_Char
: Character) return Entity_Id
5444 E
: constant Entity_Id
:= Make_Temporary
(Sloc_Value
, Id_Char
);
5447 Set_Ekind
(E
, Kind
);
5448 Set_Is_Internal
(E
, True);
5450 if Kind
in Type_Kind
then
5451 Init_Size_Align
(E
);
5454 Append_Entity
(E
, Lim_Header
);
5457 end New_Internal_Shadow_Entity
;
5459 -- Start of processing for Build_Limited_Views
5462 pragma Assert
(Limited_Present
(N
));
5464 -- A library_item mentioned in a limited_with_clause is a package
5465 -- declaration, not a subprogram declaration, generic declaration,
5466 -- generic instantiation, or package renaming declaration.
5468 case Nkind
(Unit
(Library_Unit
(N
))) is
5469 when N_Package_Declaration
=>
5472 when N_Subprogram_Declaration
=>
5473 Error_Msg_N
("subprograms not allowed in "
5474 & "limited with_clauses", N
);
5477 when N_Generic_Package_Declaration |
5478 N_Generic_Subprogram_Declaration
=>
5479 Error_Msg_N
("generics not allowed in "
5480 & "limited with_clauses", N
);
5483 when N_Generic_Instantiation
=>
5484 Error_Msg_N
("generic instantiations not allowed in "
5485 & "limited with_clauses", N
);
5488 when N_Generic_Renaming_Declaration
=>
5489 Error_Msg_N
("generic renamings not allowed in "
5490 & "limited with_clauses", N
);
5493 when N_Subprogram_Renaming_Declaration
=>
5494 Error_Msg_N
("renamed subprograms not allowed in "
5495 & "limited with_clauses", N
);
5498 when N_Package_Renaming_Declaration
=>
5499 Error_Msg_N
("renamed packages not allowed in "
5500 & "limited with_clauses", N
);
5504 raise Program_Error
;
5507 -- Check if the chain is already built
5509 Spec
:= Specification
(Unit
(Library_Unit
(N
)));
5511 if Limited_View_Installed
(Spec
) then
5515 Set_Ekind
(P
, E_Package
);
5517 -- Build the header of the limited_view
5519 Lim_Header
:= Make_Temporary
(Sloc
(N
), 'Z');
5520 Set_Ekind
(Lim_Header
, E_Package
);
5521 Set_Is_Internal
(Lim_Header
);
5522 Set_Limited_View
(P
, Lim_Header
);
5524 -- Create the auxiliary chain. All the shadow entities are appended to
5525 -- the list of entities of the limited-view header
5529 First_Decl
=> First
(Visible_Declarations
(Spec
)));
5531 -- Save the last built shadow entity. It is needed later to set the
5532 -- reference to the first shadow entity in the private part
5534 Last_Pub_Lim_E
:= Last_Lim_E
;
5536 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5537 -- Required to give support to limited-private-with clauses
5539 Build_Chain
(Scope
=> P
,
5540 First_Decl
=> First
(Private_Declarations
(Spec
)));
5542 if Last_Pub_Lim_E
/= Empty
then
5543 Set_First_Private_Entity
5544 (Lim_Header
, Next_Entity
(Last_Pub_Lim_E
));
5546 Set_First_Private_Entity
5547 (Lim_Header
, First_Entity
(P
));
5550 Set_Limited_View_Installed
(Spec
);
5551 end Build_Limited_Views
;
5553 -------------------------------
5554 -- Check_Body_Needed_For_SAL --
5555 -------------------------------
5557 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
) is
5559 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean;
5560 -- Determine whether use of entity E might require the presence of its
5561 -- body. For a package this requires a recursive traversal of all nested
5564 ---------------------------
5565 -- Entity_Needed_For_SAL --
5566 ---------------------------
5568 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean is
5572 if Is_Subprogram
(E
)
5573 and then Has_Pragma_Inline
(E
)
5577 elsif Ekind_In
(E
, E_Generic_Function
, E_Generic_Procedure
) then
5580 elsif Ekind
(E
) = E_Generic_Package
5582 Nkind
(Unit_Declaration_Node
(E
)) = N_Generic_Package_Declaration
5583 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
5587 elsif Ekind
(E
) = E_Package
5588 and then Nkind
(Unit_Declaration_Node
(E
)) = N_Package_Declaration
5589 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
5591 Ent
:= First_Entity
(E
);
5592 while Present
(Ent
) loop
5593 if Entity_Needs_Body
(Ent
) then
5605 end Entity_Needs_Body
;
5607 -- Start of processing for Check_Body_Needed_For_SAL
5610 if Ekind
(Unit_Name
) = E_Generic_Package
5611 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
5612 N_Generic_Package_Declaration
5614 Present
(Corresponding_Body
(Unit_Declaration_Node
(Unit_Name
)))
5616 Set_Body_Needed_For_SAL
(Unit_Name
);
5618 elsif Ekind_In
(Unit_Name
, E_Generic_Procedure
, E_Generic_Function
) then
5619 Set_Body_Needed_For_SAL
(Unit_Name
);
5621 elsif Is_Subprogram
(Unit_Name
)
5622 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
5623 N_Subprogram_Declaration
5624 and then Has_Pragma_Inline
(Unit_Name
)
5626 Set_Body_Needed_For_SAL
(Unit_Name
);
5628 elsif Ekind
(Unit_Name
) = E_Subprogram_Body
then
5629 Check_Body_Needed_For_SAL
5630 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
5632 elsif Ekind
(Unit_Name
) = E_Package
5633 and then Entity_Needs_Body
(Unit_Name
)
5635 Set_Body_Needed_For_SAL
(Unit_Name
);
5637 elsif Ekind
(Unit_Name
) = E_Package_Body
5638 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) = N_Package_Body
5640 Check_Body_Needed_For_SAL
5641 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
5643 end Check_Body_Needed_For_SAL
;
5645 --------------------
5646 -- Remove_Context --
5647 --------------------
5649 procedure Remove_Context
(N
: Node_Id
) is
5650 Lib_Unit
: constant Node_Id
:= Unit
(N
);
5653 -- If this is a child unit, first remove the parent units
5655 if Is_Child_Spec
(Lib_Unit
) then
5656 Remove_Parents
(Lib_Unit
);
5659 Remove_Context_Clauses
(N
);
5662 ----------------------------
5663 -- Remove_Context_Clauses --
5664 ----------------------------
5666 procedure Remove_Context_Clauses
(N
: Node_Id
) is
5668 Unit_Name
: Entity_Id
;
5671 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5672 -- limited-views first and regular-views later (to maintain the
5675 -- First Phase: Remove limited_with context clauses
5677 Item
:= First
(Context_Items
(N
));
5678 while Present
(Item
) loop
5680 -- We are interested only in with clauses which got installed
5683 if Nkind
(Item
) = N_With_Clause
5684 and then Limited_Present
(Item
)
5685 and then Limited_View_Installed
(Item
)
5687 Remove_Limited_With_Clause
(Item
);
5693 -- Second Phase: Loop through context items and undo regular
5694 -- with_clauses and use_clauses.
5696 Item
:= First
(Context_Items
(N
));
5697 while Present
(Item
) loop
5699 -- We are interested only in with clauses which got installed on
5700 -- entry, as indicated by their Context_Installed flag set
5702 if Nkind
(Item
) = N_With_Clause
5703 and then Limited_Present
(Item
)
5704 and then Limited_View_Installed
(Item
)
5708 elsif Nkind
(Item
) = N_With_Clause
5709 and then Context_Installed
(Item
)
5711 -- Remove items from one with'ed unit
5713 Unit_Name
:= Entity
(Name
(Item
));
5714 Remove_Unit_From_Visibility
(Unit_Name
);
5715 Set_Context_Installed
(Item
, False);
5717 elsif Nkind
(Item
) = N_Use_Package_Clause
then
5718 End_Use_Package
(Item
);
5720 elsif Nkind
(Item
) = N_Use_Type_Clause
then
5721 End_Use_Type
(Item
);
5726 end Remove_Context_Clauses
;
5728 --------------------------------
5729 -- Remove_Limited_With_Clause --
5730 --------------------------------
5732 procedure Remove_Limited_With_Clause
(N
: Node_Id
) is
5733 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
5736 Lim_Header
: Entity_Id
;
5737 Lim_Typ
: Entity_Id
;
5741 pragma Assert
(Limited_View_Installed
(N
));
5743 -- In case of limited with_clause on subprograms, generics, instances,
5744 -- or renamings, the corresponding error was previously posted and we
5745 -- have nothing to do here.
5747 if Nkind
(P_Unit
) /= N_Package_Declaration
then
5751 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
5753 -- Handle child packages
5755 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
5756 P
:= Defining_Identifier
(P
);
5759 if Debug_Flag_I
then
5760 Write_Str
("remove limited view of ");
5761 Write_Name
(Chars
(P
));
5762 Write_Str
(" from visibility");
5766 -- Prepare the removal of the shadow entities from visibility. The
5767 -- first element of the limited view is a header (an E_Package
5768 -- entity) that is used to reference the first shadow entity in the
5769 -- private part of the package
5771 Lim_Header
:= Limited_View
(P
);
5772 Lim_Typ
:= First_Entity
(Lim_Header
);
5774 -- Remove package and shadow entities from visibility if it has not
5777 if not Analyzed
(P_Unit
) then
5779 Set_Is_Immediately_Visible
(P
, False);
5781 while Present
(Lim_Typ
) loop
5783 Next_Entity
(Lim_Typ
);
5786 -- Otherwise this package has already appeared in the closure and its
5787 -- shadow entities must be replaced by its real entities. This code
5788 -- must be kept synchronized with the complementary code in Install
5789 -- Limited_Withed_Unit.
5792 -- Real entities that are type or subtype declarations were hidden
5793 -- from visibility at the point of installation of the limited-view.
5794 -- Now we recover the previous value of the hidden attribute.
5796 E
:= First_Entity
(P
);
5797 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
5799 Set_Is_Hidden
(E
, Was_Hidden
(E
));
5805 while Present
(Lim_Typ
)
5806 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
5808 -- Nested packages and child units were not unchained
5810 if Ekind
(Lim_Typ
) /= E_Package
5811 and then not Is_Child_Unit
(Non_Limited_View
(Lim_Typ
))
5813 -- If the package has incomplete types, the limited view of the
5814 -- incomplete type is in fact never visible (AI05-129) but we
5815 -- have created a shadow entity E1 for it, that points to E2,
5816 -- a non-limited incomplete type. This in turn has a full view
5817 -- E3 that is the full declaration. There is a corresponding
5818 -- shadow entity E4. When reinstalling the non-limited view,
5819 -- E2 must become the current entity and E3 must be ignored.
5821 E
:= Non_Limited_View
(Lim_Typ
);
5823 if Present
(Current_Entity
(E
))
5824 and then Ekind
(Current_Entity
(E
)) = E_Incomplete_Type
5825 and then Full_View
(Current_Entity
(E
)) = E
5828 -- Lim_Typ is the limited view of a full type declaration
5829 -- that has a previous incomplete declaration, i.e. E3 from
5830 -- the previous description. Nothing to insert.
5835 pragma Assert
(not In_Chain
(E
));
5837 Prev
:= Current_Entity
(Lim_Typ
);
5839 if Prev
= Lim_Typ
then
5840 Set_Current_Entity
(E
);
5843 while Present
(Prev
)
5844 and then Homonym
(Prev
) /= Lim_Typ
5846 Prev
:= Homonym
(Prev
);
5849 if Present
(Prev
) then
5850 Set_Homonym
(Prev
, E
);
5854 -- Preserve structure of homonym chain
5856 Set_Homonym
(E
, Homonym
(Lim_Typ
));
5860 Next_Entity
(Lim_Typ
);
5864 -- Indicate that the limited view of the package is not installed
5866 Set_From_With_Type
(P
, False);
5867 Set_Limited_View_Installed
(N
, False);
5868 end Remove_Limited_With_Clause
;
5870 --------------------
5871 -- Remove_Parents --
5872 --------------------
5874 procedure Remove_Parents
(Lib_Unit
: Node_Id
) is
5877 P_Spec
: Node_Id
:= Empty
;
5879 Vis
: constant Boolean :=
5880 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
;
5883 if Is_Child_Spec
(Lib_Unit
) then
5884 P_Spec
:= Parent_Spec
(Lib_Unit
);
5886 elsif Nkind
(Lib_Unit
) = N_Package_Body
5887 and then Nkind
(Original_Node
(Lib_Unit
)) = N_Package_Instantiation
5889 P_Spec
:= Parent_Spec
(Original_Node
(Lib_Unit
));
5892 if Present
(P_Spec
) then
5894 P_Name
:= Get_Parent_Entity
(P
);
5895 Remove_Context_Clauses
(P_Spec
);
5896 End_Package_Scope
(P_Name
);
5897 Set_Is_Immediately_Visible
(P_Name
, Vis
);
5899 -- Remove from visibility the siblings as well, which are directly
5900 -- visible while the parent is in scope.
5902 E
:= First_Entity
(P_Name
);
5903 while Present
(E
) loop
5904 if Is_Child_Unit
(E
) then
5905 Set_Is_Immediately_Visible
(E
, False);
5911 Set_In_Package_Body
(P_Name
, False);
5913 -- This is the recursive call to remove the context of any higher
5914 -- level parent. This recursion ensures that all parents are removed
5915 -- in the reverse order of their installation.
5921 ---------------------------------
5922 -- Remove_Private_With_Clauses --
5923 ---------------------------------
5925 procedure Remove_Private_With_Clauses
(Comp_Unit
: Node_Id
) is
5928 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean;
5929 -- Check whether a given unit appears in a regular with_clause. Used to
5930 -- determine whether a private_with_clause, implicit or explicit, should
5933 ----------------------------
5934 -- In_Regular_With_Clause --
5935 ----------------------------
5937 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean
5942 Item
:= First
(Context_Items
(Comp_Unit
));
5943 while Present
(Item
) loop
5944 if Nkind
(Item
) = N_With_Clause
5945 and then Entity
(Name
(Item
)) = E
5946 and then not Private_Present
(Item
)
5954 end In_Regular_With_Clause
;
5956 -- Start of processing for Remove_Private_With_Clauses
5959 Item
:= First
(Context_Items
(Comp_Unit
));
5960 while Present
(Item
) loop
5961 if Nkind
(Item
) = N_With_Clause
5962 and then Private_Present
(Item
)
5964 -- If private_with_clause is redundant, remove it from context,
5965 -- as a small optimization to subsequent handling of private_with
5966 -- clauses in other nested packages.
5968 if In_Regular_With_Clause
(Entity
(Name
(Item
))) then
5970 Nxt
: constant Node_Id
:= Next
(Item
);
5976 elsif Limited_Present
(Item
) then
5977 if not Limited_View_Installed
(Item
) then
5978 Remove_Limited_With_Clause
(Item
);
5984 Remove_Unit_From_Visibility
(Entity
(Name
(Item
)));
5985 Set_Context_Installed
(Item
, False);
5993 end Remove_Private_With_Clauses
;
5995 ---------------------------------
5996 -- Remove_Unit_From_Visibility --
5997 ---------------------------------
5999 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
) is
6000 P
: constant Entity_Id
:= Scope
(Unit_Name
);
6003 if Debug_Flag_I
then
6004 Write_Str
("remove unit ");
6005 Write_Name
(Chars
(Unit_Name
));
6006 Write_Str
(" from visibility");
6010 if P
/= Standard_Standard
then
6011 Set_Is_Visible_Child_Unit
(Unit_Name
, False);
6014 Set_Is_Potentially_Use_Visible
(Unit_Name
, False);
6015 Set_Is_Immediately_Visible
(Unit_Name
, False);
6016 end Remove_Unit_From_Visibility
;
6031 procedure Unchain
(E
: Entity_Id
) is
6035 Prev
:= Current_Entity
(E
);
6041 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
6044 while Present
(Prev
)
6045 and then Homonym
(Prev
) /= E
6047 Prev
:= Homonym
(Prev
);
6050 if Present
(Prev
) then
6051 Set_Homonym
(Prev
, Homonym
(E
));
6055 if Debug_Flag_I
then
6056 Write_Str
(" (homonym) unchain ");
6057 Write_Name
(Chars
(E
));