1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2008, 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 Restrict
; use Restrict
;
46 with Rident
; use Rident
;
47 with Rtsfind
; use Rtsfind
;
49 with Sem_Ch3
; use Sem_Ch3
;
50 with Sem_Ch6
; use Sem_Ch6
;
51 with Sem_Ch7
; use Sem_Ch7
;
52 with Sem_Ch8
; use Sem_Ch8
;
53 with Sem_Dist
; use Sem_Dist
;
54 with Sem_Prag
; use Sem_Prag
;
55 with Sem_Util
; use Sem_Util
;
56 with Sem_Warn
; use Sem_Warn
;
57 with Stand
; use Stand
;
58 with Sinfo
; use Sinfo
;
59 with Sinfo
.CN
; use Sinfo
.CN
;
60 with Sinput
; use Sinput
;
61 with Snames
; use Snames
;
62 with Style
; use Style
;
63 with Stylesw
; use Stylesw
;
64 with Tbuild
; use Tbuild
;
65 with Uname
; use Uname
;
67 package body Sem_Ch10
is
69 -----------------------
70 -- Local Subprograms --
71 -----------------------
73 procedure Analyze_Context
(N
: Node_Id
);
74 -- Analyzes items in the context clause of compilation unit
76 procedure Build_Limited_Views
(N
: Node_Id
);
77 -- Build and decorate the list of shadow entities for a package mentioned
78 -- in a limited_with clause. If the package was not previously analyzed
79 -- then it also performs a basic decoration of the real entities; this
80 -- is required to do not pass non-decorated entities to the back-end.
81 -- Implements Ada 2005 (AI-50217).
83 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
);
84 -- Check whether the source for the body of a compilation unit must
85 -- be included in a standalone library.
87 procedure Check_Private_Child_Unit
(N
: Node_Id
);
88 -- If a with_clause mentions a private child unit, the compilation
89 -- unit must be a member of the same family, as described in 10.1.2.
91 procedure Check_Stub_Level
(N
: Node_Id
);
92 -- Verify that a stub is declared immediately within a compilation unit,
93 -- and not in an inner frame.
95 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
);
96 -- When a child unit appears in a context clause, the implicit withs on
97 -- parents are made explicit, and with clauses are inserted in the context
98 -- clause before the one for the child. If a parent in the with_clause
99 -- is a renaming, the implicit with_clause is on the renaming whose name
100 -- is mentioned in the with_clause, and not on the package it renames.
101 -- N is the compilation unit whose list of context items receives the
102 -- implicit with_clauses.
104 function Get_Parent_Entity
(Unit
: Node_Id
) return Entity_Id
;
105 -- Get defining entity of parent unit of a child unit. In most cases this
106 -- is the defining entity of the unit, but for a child instance whose
107 -- parent needs a body for inlining, the instantiation node of the parent
108 -- has not yet been rewritten as a package declaration, and the entity has
109 -- to be retrieved from the Instance_Spec of the unit.
111 procedure Implicit_With_On_Parent
(Child_Unit
: Node_Id
; N
: Node_Id
);
112 -- If the main unit is a child unit, implicit withs are also added for
113 -- all its ancestors.
115 function In_Chain
(E
: Entity_Id
) return Boolean;
116 -- Check that the shadow entity is not already in the homonym chain, for
117 -- example through a limited_with clause in a parent unit.
119 procedure Install_Context_Clauses
(N
: Node_Id
);
120 -- Subsidiary to Install_Context and Install_Parents. Process only with_
121 -- and use_clauses for current unit and its library unit if any.
123 procedure Install_Limited_Context_Clauses
(N
: Node_Id
);
124 -- Subsidiary to Install_Context. Process only limited with_clauses
125 -- for current unit. Implements Ada 2005 (AI-50217).
127 procedure Install_Limited_Withed_Unit
(N
: Node_Id
);
128 -- Place shadow entities for a limited_with package in the visibility
129 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
131 procedure Install_Withed_Unit
132 (With_Clause
: Node_Id
;
133 Private_With_OK
: Boolean := False);
134 -- If the unit is not a child unit, make unit immediately visible.
135 -- The caller ensures that the unit is not already currently installed.
136 -- The flag Private_With_OK is set true in Install_Private_With_Clauses,
137 -- which is called when compiling the private part of a package, or
138 -- installing the private declarations of a parent unit.
140 procedure Install_Parents
(Lib_Unit
: Node_Id
; Is_Private
: Boolean);
141 -- This procedure establishes the context for the compilation of a child
142 -- unit. If Lib_Unit is a child library spec then the context of the parent
143 -- is installed, and the parent itself made immediately visible, so that
144 -- the child unit is processed in the declarative region of the parent.
145 -- Install_Parents makes a recursive call to itself to ensure that all
146 -- parents are loaded in the nested case. If Lib_Unit is a library body,
147 -- the only effect of Install_Parents is to install the private decls of
148 -- the parents, because the visible parent declarations will have been
149 -- installed as part of the context of the corresponding spec.
151 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
);
152 -- In the compilation of a child unit, a child of any of the ancestor
153 -- units is directly visible if it is visible, because the parent is in
154 -- an enclosing scope. Iterate over context to find child units of U_Name
155 -- or of some ancestor of it.
157 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean;
158 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
159 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
160 -- a library spec that has a parent. If the call to Is_Child_Spec returns
161 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
162 -- compilation unit for the parent spec.
164 -- Lib_Unit can also be a subprogram body that acts as its own spec. If
165 -- the Parent_Spec is non-empty, this is also a child unit.
167 procedure Remove_Context_Clauses
(N
: Node_Id
);
168 -- Subsidiary of previous one. Remove use_ and with_clauses
170 procedure Remove_Limited_With_Clause
(N
: Node_Id
);
171 -- Remove from visibility the shadow entities introduced for a package
172 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
174 procedure Remove_Parents
(Lib_Unit
: Node_Id
);
175 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
176 -- contexts established by the corresponding call to Install_Parents are
177 -- removed. Remove_Parents contains a recursive call to itself to ensure
178 -- that all parents are removed in the nested case.
180 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
);
181 -- Reset all visibility flags on unit after compiling it, either as a
182 -- main unit or as a unit in the context.
184 procedure Unchain
(E
: Entity_Id
);
185 -- Remove single entity from visibility list
187 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
);
188 -- Common processing for all stubs (subprograms, tasks, packages, and
189 -- protected cases). N is the stub to be analyzed. Once the subunit
190 -- name is established, load and analyze. Nam is the non-overloadable
191 -- entity for which the proper body provides a completion. Subprogram
192 -- stubs are handled differently because they can be declarations.
195 -- A dummy procedure, for debugging use, called just before analyzing the
196 -- main unit (after dealing with any context clauses).
198 --------------------------
199 -- Limited_With_Clauses --
200 --------------------------
202 -- Limited_With clauses are the mechanism chosen for Ada05 to support
203 -- mutually recursive types declared in different units. A limited_with
204 -- clause that names package P in the context of unit U makes the types
205 -- declared in the visible part of P available within U, but with the
206 -- restriction that these types can only be used as incomplete types.
207 -- The limited_with clause does not impose a semantic dependence on P,
208 -- and it is possible for two packages to have limited_with_clauses on
209 -- each other without creating an elaboration circularity.
211 -- To support this feature, the analysis of a limited_with clause must
212 -- create an abbreviated view of the package, without performing any
213 -- semantic analysis on it. This "package abstract" contains shadow
214 -- types that are in one-one correspondence with the real types in the
215 -- package, and that have the properties of incomplete types.
217 -- The implementation creates two element lists: one to chain the shadow
218 -- entities, and one to chain the corresponding type entities in the tree
219 -- of the package. Links between corresponding entities in both chains
220 -- allow the compiler to select the proper view of a given type, depending
221 -- on the context. Note that in contrast with the handling of private
222 -- types, the limited view and the non-limited view of a type are treated
223 -- as separate entities, and no entity exchange needs to take place, which
224 -- makes the implementation must simpler than could be feared.
226 ------------------------------
227 -- Analyze_Compilation_Unit --
228 ------------------------------
230 procedure Analyze_Compilation_Unit
(N
: Node_Id
) is
231 Unit_Node
: constant Node_Id
:= Unit
(N
);
232 Lib_Unit
: Node_Id
:= Library_Unit
(N
);
234 Main_Cunit
: constant Node_Id
:= Cunit
(Main_Unit
);
235 Par_Spec_Name
: Unit_Name_Type
;
236 Unum
: Unit_Number_Type
;
238 procedure Check_Redundant_Withs
239 (Context_Items
: List_Id
;
240 Spec_Context_Items
: List_Id
:= No_List
);
241 -- Determine whether the context list of a compilation unit contains
242 -- redundant with clauses. When checking body clauses against spec
243 -- clauses, set Context_Items to the context list of the body and
244 -- Spec_Context_Items to that of the spec. Parent packages are not
245 -- examined for documentation purposes.
247 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
);
248 -- Generate cross-reference information for the parents of child units.
249 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
251 ---------------------------
252 -- Check_Redundant_Withs --
253 ---------------------------
255 procedure Check_Redundant_Withs
256 (Context_Items
: List_Id
;
257 Spec_Context_Items
: List_Id
:= No_List
)
261 procedure Process_Body_Clauses
262 (Context_List
: List_Id
;
264 Used
: in out Boolean;
265 Used_Type_Or_Elab
: in out Boolean);
266 -- Examine the context clauses of a package body, trying to match
267 -- the name entity of Clause with any list element. If the match
268 -- occurs on a use package clause, set Used to True, for a use
269 -- type clause, pragma Elaborate or pragma Elaborate_All, set
270 -- Used_Type_Or_Elab to True.
272 procedure Process_Spec_Clauses
273 (Context_List
: List_Id
;
275 Used
: in out Boolean;
276 Withed
: in out Boolean;
277 Exit_On_Self
: Boolean := False);
278 -- Examine the context clauses of a package spec, trying to match
279 -- the name entity of Clause with any list element. If the match
280 -- occurs on a use package clause, set Used to True, for a with
281 -- package clause other than Clause, set Withed to True. Limited
282 -- with clauses, implicitly generated with clauses and withs
283 -- having pragmas Elaborate or Elaborate_All applied to them are
284 -- skipped. Exit_On_Self is used to control the search loop and
285 -- force an exit whenever Clause sees itself in the search.
287 --------------------------
288 -- Process_Body_Clauses --
289 --------------------------
291 procedure Process_Body_Clauses
292 (Context_List
: List_Id
;
294 Used
: in out Boolean;
295 Used_Type_Or_Elab
: in out Boolean)
297 Nam_Ent
: constant Entity_Id
:= Entity
(Name
(Clause
));
303 function Same_Unit
(N
: Node_Id
; P
: Entity_Id
) return Boolean;
304 -- In an expanded name in a use clause, if the prefix is a
305 -- renamed package, the entity is set to the original package
306 -- as a result, when checking whether the package appears in a
307 -- previous with_clause, the renaming has to be taken into
308 -- account, to prevent spurious or incorrect warnings. The
309 -- common case is the use of Text_IO.
315 function Same_Unit
(N
: Node_Id
; P
: Entity_Id
) return Boolean is
317 return Entity
(N
) = P
319 (Present
(Renamed_Object
(P
))
320 and then Entity
(N
) = Renamed_Object
(P
));
323 -- Start of processing for Process_Body_Clauses
327 Used_Type_Or_Elab
:= False;
329 Cont_Item
:= First
(Context_List
);
330 while Present
(Cont_Item
) loop
332 -- Package use clause
334 if Nkind
(Cont_Item
) = N_Use_Package_Clause
337 -- Search through use clauses
339 Use_Item
:= First
(Names
(Cont_Item
));
340 while Present
(Use_Item
) and then not Used
loop
342 -- Case of a direct use of the one we are looking for
344 if Entity
(Use_Item
) = Nam_Ent
then
347 -- Handle nested case, as in "with P; use P.Q.R"
354 -- Loop through prefixes looking for match
357 while Nkind
(UE
) = N_Expanded_Name
loop
358 if Same_Unit
(Prefix
(UE
), Nam_Ent
) then
373 elsif Nkind
(Cont_Item
) = N_Use_Type_Clause
374 and then not Used_Type_Or_Elab
376 Subt_Mark
:= First
(Subtype_Marks
(Cont_Item
));
377 while Present
(Subt_Mark
)
378 and then not Used_Type_Or_Elab
380 if Same_Unit
(Prefix
(Subt_Mark
), Nam_Ent
) then
381 Used_Type_Or_Elab
:= True;
387 -- Pragma Elaborate or Elaborate_All
389 elsif Nkind
(Cont_Item
) = N_Pragma
391 (Pragma_Name
(Cont_Item
) = Name_Elaborate
393 Pragma_Name
(Cont_Item
) = Name_Elaborate_All
)
394 and then not Used_Type_Or_Elab
397 First
(Pragma_Argument_Associations
(Cont_Item
));
398 while Present
(Prag_Unit
)
399 and then not Used_Type_Or_Elab
401 if Entity
(Expression
(Prag_Unit
)) = Nam_Ent
then
402 Used_Type_Or_Elab
:= True;
411 end Process_Body_Clauses
;
413 --------------------------
414 -- Process_Spec_Clauses --
415 --------------------------
417 procedure Process_Spec_Clauses
418 (Context_List
: List_Id
;
420 Used
: in out Boolean;
421 Withed
: in out Boolean;
422 Exit_On_Self
: Boolean := False)
424 Nam_Ent
: constant Entity_Id
:= Entity
(Name
(Clause
));
432 Cont_Item
:= First
(Context_List
);
433 while Present
(Cont_Item
) loop
435 -- Stop the search since the context items after Cont_Item
436 -- have already been examined in a previous iteration of
437 -- the reverse loop in Check_Redundant_Withs.
440 and Cont_Item
= Clause
445 -- Package use clause
447 if Nkind
(Cont_Item
) = N_Use_Package_Clause
450 Use_Item
:= First
(Names
(Cont_Item
));
451 while Present
(Use_Item
) and then not Used
loop
452 if Entity
(Use_Item
) = Nam_Ent
then
459 -- Package with clause. Avoid processing self, implicitly
460 -- generated with clauses or limited with clauses. Note
461 -- that we examine with clauses having pragmas Elaborate
462 -- or Elaborate_All applied to them due to cases such as:
466 -- pragma Elaborate (Pack);
468 -- In this case, the second with clause is redundant since
469 -- the pragma applies only to the first "with Pack;".
471 elsif Nkind
(Cont_Item
) = N_With_Clause
472 and then not Implicit_With
(Cont_Item
)
473 and then not Limited_Present
(Cont_Item
)
474 and then Cont_Item
/= Clause
475 and then Entity
(Name
(Cont_Item
)) = Nam_Ent
482 end Process_Spec_Clauses
;
484 -- Start of processing for Check_Redundant_Withs
487 Clause
:= Last
(Context_Items
);
488 while Present
(Clause
) loop
490 -- Avoid checking implicitly generated with clauses, limited
491 -- with clauses or withs that have pragma Elaborate or
492 -- Elaborate_All applied.
494 if Nkind
(Clause
) = N_With_Clause
495 and then not Implicit_With
(Clause
)
496 and then not Limited_Present
(Clause
)
497 and then not Elaborate_Present
(Clause
)
499 -- Package body-to-spec check
501 if Present
(Spec_Context_Items
) then
503 Used_In_Body
: Boolean := False;
504 Used_In_Spec
: Boolean := False;
505 Used_Type_Or_Elab
: Boolean := False;
506 Withed_In_Spec
: Boolean := False;
510 (Context_List
=> Spec_Context_Items
,
512 Used
=> Used_In_Spec
,
513 Withed
=> Withed_In_Spec
);
516 (Context_List
=> Context_Items
,
518 Used
=> Used_In_Body
,
519 Used_Type_Or_Elab
=> Used_Type_Or_Elab
);
521 -- "Type Elab" refers to the presence of either a use
522 -- type clause, pragmas Elaborate or Elaborate_All.
524 -- +---------------+---------------------------+------+
525 -- | Spec | Body | Warn |
526 -- +--------+------+--------+------+-----------+------+
527 -- | Withed | Used | Withed | Used | Type Elab | |
528 -- | X | | X | | | X |
529 -- | X | | X | X | | |
530 -- | X | | X | | X | |
531 -- | X | | X | X | X | |
532 -- | X | X | X | | | X |
533 -- | X | X | X | | X | |
534 -- | X | X | X | X | | X |
535 -- | X | X | X | X | X | |
536 -- +--------+------+--------+------+-----------+------+
539 and then not Used_Type_Or_Elab
)
542 and then not Used_In_Body
)
546 Error_Msg_N
("?redundant with clause in body", Clause
);
549 Used_In_Body
:= False;
550 Used_In_Spec
:= False;
551 Used_Type_Or_Elab
:= False;
552 Withed_In_Spec
:= False;
555 -- Standalone package spec or body check
559 Dont_Care
: Boolean := False;
560 Withed
: Boolean := False;
563 -- The mechanism for examining the context clauses of a
564 -- package spec can be applied to package body clauses.
567 (Context_List
=> Context_Items
,
571 Exit_On_Self
=> True);
574 Error_Msg_N
("?redundant with clause", Clause
);
582 end Check_Redundant_Withs
;
584 --------------------------------
585 -- Generate_Parent_References --
586 --------------------------------
588 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
) is
590 P_Name
: Entity_Id
:= P_Id
;
593 Pref
:= Name
(Parent
(Defining_Entity
(N
)));
595 if Nkind
(Pref
) = N_Expanded_Name
then
597 -- Done already, if the unit has been compiled indirectly as
598 -- part of the closure of its context because of inlining.
603 while Nkind
(Pref
) = N_Selected_Component
loop
604 Change_Selected_Component_To_Expanded_Name
(Pref
);
605 Set_Entity
(Pref
, P_Name
);
606 Set_Etype
(Pref
, Etype
(P_Name
));
607 Generate_Reference
(P_Name
, Pref
, 'r');
608 Pref
:= Prefix
(Pref
);
609 P_Name
:= Scope
(P_Name
);
612 -- The guard here on P_Name is to handle the error condition where
613 -- the parent unit is missing because the file was not found.
615 if Present
(P_Name
) then
616 Set_Entity
(Pref
, P_Name
);
617 Set_Etype
(Pref
, Etype
(P_Name
));
618 Generate_Reference
(P_Name
, Pref
, 'r');
619 Style
.Check_Identifier
(Pref
, P_Name
);
621 end Generate_Parent_References
;
623 -- Start of processing for Analyze_Compilation_Unit
626 Process_Compilation_Unit_Pragmas
(N
);
628 -- If the unit is a subunit whose parent has not been analyzed (which
629 -- indicates that the main unit is a subunit, either the current one or
630 -- one of its descendents) then the subunit is compiled as part of the
631 -- analysis of the parent, which we proceed to do. Basically this gets
632 -- handled from the top down and we don't want to do anything at this
633 -- level (i.e. this subunit will be handled on the way down from the
634 -- parent), so at this level we immediately return. If the subunit
635 -- ends up not analyzed, it means that the parent did not contain a
636 -- stub for it, or that there errors were detected in some ancestor.
638 if Nkind
(Unit_Node
) = N_Subunit
639 and then not Analyzed
(Lib_Unit
)
641 Semantics
(Lib_Unit
);
643 if not Analyzed
(Proper_Body
(Unit_Node
)) then
644 if Serious_Errors_Detected
> 0 then
645 Error_Msg_N
("subunit not analyzed (errors in parent unit)", N
);
647 Error_Msg_N
("missing stub for subunit", N
);
654 -- Analyze context (this will call Sem recursively for with'ed units)
658 -- If the unit is a package body, the spec is already loaded and must
659 -- be analyzed first, before we analyze the body.
661 if Nkind
(Unit_Node
) = N_Package_Body
then
663 -- If no Lib_Unit, then there was a serious previous error, so
664 -- just ignore the entire analysis effort
666 if No
(Lib_Unit
) then
670 Semantics
(Lib_Unit
);
671 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
673 -- Verify that the library unit is a package declaration
675 if not Nkind_In
(Unit
(Lib_Unit
), N_Package_Declaration
,
676 N_Generic_Package_Declaration
)
679 ("no legal package declaration for package body", N
);
682 -- Otherwise, the entity in the declaration is visible. Update
683 -- the version to reflect dependence of this body on the spec.
686 Spec_Id
:= Defining_Entity
(Unit
(Lib_Unit
));
687 Set_Is_Immediately_Visible
(Spec_Id
, True);
688 Version_Update
(N
, Lib_Unit
);
690 if Nkind
(Defining_Unit_Name
(Unit_Node
)) =
691 N_Defining_Program_Unit_Name
693 Generate_Parent_References
(Unit_Node
, Scope
(Spec_Id
));
698 -- If the unit is a subprogram body, then we similarly need to analyze
699 -- its spec. However, things are a little simpler in this case, because
700 -- here, this analysis is done only for error checking and consistency
701 -- purposes, so there's nothing else to be done.
703 elsif Nkind
(Unit_Node
) = N_Subprogram_Body
then
704 if Acts_As_Spec
(N
) then
706 -- If the subprogram body is a child unit, we must create a
707 -- declaration for it, in order to properly load the parent(s).
708 -- After this, the original unit does not acts as a spec, because
709 -- there is an explicit one. If this unit appears in a context
710 -- clause, then an implicit with on the parent will be added when
711 -- installing the context. If this is the main unit, there is no
712 -- Unit_Table entry for the declaration (it has the unit number
713 -- of the main unit) and code generation is unaffected.
715 Unum
:= Get_Cunit_Unit_Number
(N
);
716 Par_Spec_Name
:= Get_Parent_Spec_Name
(Unit_Name
(Unum
));
718 if Par_Spec_Name
/= No_Unit_Name
then
721 (Load_Name
=> Par_Spec_Name
,
726 if Unum
/= No_Unit
then
728 -- Build subprogram declaration and attach parent unit to it
729 -- This subprogram declaration does not come from source,
730 -- Nevertheless the backend must generate debugging info for
731 -- it, and this must be indicated explicitly. We also mark
732 -- the body entity as a child unit now, to prevent a
733 -- cascaded error if the spec entity cannot be entered
737 Loc
: constant Source_Ptr
:= Sloc
(N
);
738 SCS
: constant Boolean :=
739 Get_Comes_From_Source_Default
;
742 Set_Comes_From_Source_Default
(False);
744 Make_Compilation_Unit
(Loc
,
745 Context_Items
=> New_Copy_List
(Context_Items
(N
)),
747 Make_Subprogram_Declaration
(Sloc
(N
),
750 (Specification
(Unit_Node
))),
752 Make_Compilation_Unit_Aux
(Loc
));
754 Set_Library_Unit
(N
, Lib_Unit
);
755 Set_Parent_Spec
(Unit
(Lib_Unit
), Cunit
(Unum
));
756 Semantics
(Lib_Unit
);
758 -- Now that a separate declaration exists, the body
759 -- of the child unit does not act as spec any longer.
761 Set_Acts_As_Spec
(N
, False);
762 Set_Is_Child_Unit
(Defining_Entity
(Unit_Node
));
763 Set_Debug_Info_Needed
(Defining_Entity
(Unit
(Lib_Unit
)));
764 Set_Comes_From_Source_Default
(SCS
);
769 -- Here for subprogram with separate declaration
772 Semantics
(Lib_Unit
);
773 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
774 Version_Update
(N
, Lib_Unit
);
777 if Nkind
(Defining_Unit_Name
(Specification
(Unit_Node
))) =
778 N_Defining_Program_Unit_Name
780 Generate_Parent_References
(
781 Specification
(Unit_Node
),
782 Scope
(Defining_Entity
(Unit
(Lib_Unit
))));
786 -- If it is a child unit, the parent must be elaborated first
787 -- and we update version, since we are dependent on our parent.
789 if Is_Child_Spec
(Unit_Node
) then
791 -- The analysis of the parent is done with style checks off
794 Save_Style_Check
: constant Boolean := Style_Check
;
795 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
796 Cunit_Boolean_Restrictions_Save
;
799 if not GNAT_Mode
then
800 Style_Check
:= False;
803 Semantics
(Parent_Spec
(Unit_Node
));
804 Version_Update
(N
, Parent_Spec
(Unit_Node
));
805 Style_Check
:= Save_Style_Check
;
806 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
810 -- With the analysis done, install the context. Note that we can't
811 -- install the context from the with clauses as we analyze them, because
812 -- each with clause must be analyzed in a clean visibility context, so
813 -- we have to wait and install them all at once.
817 if Is_Child_Spec
(Unit_Node
) then
819 -- Set the entities of all parents in the program_unit_name
821 Generate_Parent_References
(
822 Unit_Node
, Get_Parent_Entity
(Unit
(Parent_Spec
(Unit_Node
))));
825 -- All components of the context: with-clauses, library unit, ancestors
826 -- if any, (and their context) are analyzed and installed.
828 -- Call special debug routine sm if this is the main unit
830 if Current_Sem_Unit
= Main_Unit
then
834 -- Now analyze the unit (package, subprogram spec, body) itself
838 if Warn_On_Redundant_Constructs
then
839 Check_Redundant_Withs
(Context_Items
(N
));
841 if Nkind
(Unit_Node
) = N_Package_Body
then
842 Check_Redundant_Withs
843 (Context_Items
=> Context_Items
(N
),
844 Spec_Context_Items
=> Context_Items
(Lib_Unit
));
848 -- The above call might have made Unit_Node an N_Subprogram_Body from
849 -- something else, so propagate any Acts_As_Spec flag.
851 if Nkind
(Unit_Node
) = N_Subprogram_Body
852 and then Acts_As_Spec
(Unit_Node
)
854 Set_Acts_As_Spec
(N
);
857 -- Register predefined units in Rtsfind
860 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Sloc
(N
));
862 if Is_Predefined_File_Name
(Unit_File_Name
(Unum
)) then
863 Set_RTU_Loaded
(Unit_Node
);
867 -- Treat compilation unit pragmas that appear after the library unit
869 if Present
(Pragmas_After
(Aux_Decls_Node
(N
))) then
871 Prag_Node
: Node_Id
:= First
(Pragmas_After
(Aux_Decls_Node
(N
)));
873 while Present
(Prag_Node
) loop
880 -- Generate distribution stubs if requested and no error
883 and then (Distribution_Stub_Mode
= Generate_Receiver_Stub_Body
885 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
886 and then not Fatal_Error
(Main_Unit
)
888 if Is_RCI_Pkg_Spec_Or_Body
(N
) then
890 -- Regular RCI package
892 Add_Stub_Constructs
(N
);
894 elsif (Nkind
(Unit_Node
) = N_Package_Declaration
895 and then Is_Shared_Passive
(Defining_Entity
896 (Specification
(Unit_Node
))))
897 or else (Nkind
(Unit_Node
) = N_Package_Body
899 Is_Shared_Passive
(Corresponding_Spec
(Unit_Node
)))
901 -- Shared passive package
903 Add_Stub_Constructs
(N
);
905 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
907 Is_Remote_Call_Interface
908 (Defining_Entity
(Specification
(Instance_Spec
(Unit_Node
))))
910 -- Instantiation of a RCI generic package
912 Add_Stub_Constructs
(N
);
916 -- Remove unit from visibility, so that environment is clean for
917 -- the next compilation, which is either the main unit or some
918 -- other unit in the context.
920 if Nkind_In
(Unit_Node
, N_Package_Declaration
,
921 N_Package_Renaming_Declaration
,
922 N_Subprogram_Declaration
)
923 or else Nkind
(Unit_Node
) in N_Generic_Declaration
925 (Nkind
(Unit_Node
) = N_Subprogram_Body
926 and then Acts_As_Spec
(Unit_Node
))
928 Remove_Unit_From_Visibility
(Defining_Entity
(Unit_Node
));
930 -- If the unit is an instantiation whose body will be elaborated for
931 -- inlining purposes, use the proper entity of the instance. The
932 -- entity may be missing if the instantiation was illegal.
934 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
935 and then not Error_Posted
(Unit_Node
)
936 and then Present
(Instance_Spec
(Unit_Node
))
938 Remove_Unit_From_Visibility
939 (Defining_Entity
(Instance_Spec
(Unit_Node
)));
941 elsif Nkind
(Unit_Node
) = N_Package_Body
942 or else (Nkind
(Unit_Node
) = N_Subprogram_Body
943 and then not Acts_As_Spec
(Unit_Node
))
945 -- Bodies that are not the main unit are compiled if they are generic
946 -- or contain generic or inlined units. Their analysis brings in the
947 -- context of the corresponding spec (unit declaration) which must be
948 -- removed as well, to return the compilation environment to its
951 Remove_Context
(Lib_Unit
);
952 Set_Is_Immediately_Visible
(Defining_Entity
(Unit
(Lib_Unit
)), False);
955 -- Last step is to deinstall the context we just installed as well as
956 -- the unit just compiled.
960 -- If this is the main unit and we are generating code, we must check
961 -- that all generic units in the context have a body if they need it,
962 -- even if they have not been instantiated. In the absence of .ali files
963 -- for generic units, we must force the load of the body, just to
964 -- produce the proper error if the body is absent. We skip this
965 -- verification if the main unit itself is generic.
967 if Get_Cunit_Unit_Number
(N
) = Main_Unit
968 and then Operating_Mode
= Generate_Code
969 and then Expander_Active
971 -- Check whether the source for the body of the unit must be included
972 -- in a standalone library.
974 Check_Body_Needed_For_SAL
(Cunit_Entity
(Main_Unit
));
976 -- Indicate that the main unit is now analyzed, to catch possible
977 -- circularities between it and generic bodies. Remove main unit from
978 -- visibility. This might seem superfluous, but the main unit must
979 -- not be visible in the generic body expansions that follow.
981 Set_Analyzed
(N
, True);
982 Set_Is_Immediately_Visible
(Cunit_Entity
(Main_Unit
), False);
987 Un
: Unit_Number_Type
;
989 Save_Style_Check
: constant Boolean := Style_Check
;
990 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
991 Cunit_Boolean_Restrictions_Save
;
994 Item
:= First
(Context_Items
(N
));
995 while Present
(Item
) loop
997 -- Check for explicit with clause
999 if Nkind
(Item
) = N_With_Clause
1000 and then not Implicit_With
(Item
)
1002 -- Ada 2005 (AI-50217): Ignore limited-withed units
1004 and then not Limited_Present
(Item
)
1006 Nam
:= Entity
(Name
(Item
));
1008 -- Compile generic subprogram, unless it is intrinsic or
1009 -- imported so no body is required, or generic package body
1010 -- if the package spec requires a body.
1012 if (Is_Generic_Subprogram
(Nam
)
1013 and then not Is_Intrinsic_Subprogram
(Nam
)
1014 and then not Is_Imported
(Nam
))
1015 or else (Ekind
(Nam
) = E_Generic_Package
1016 and then Unit_Requires_Body
(Nam
))
1018 Style_Check
:= False;
1020 if Present
(Renamed_Object
(Nam
)) then
1023 (Load_Name
=> Get_Body_Name
1025 (Unit_Declaration_Node
1026 (Renamed_Object
(Nam
)))),
1034 (Load_Name
=> Get_Body_Name
1035 (Get_Unit_Name
(Item
)),
1042 if Un
= No_Unit
then
1044 ("body of generic unit& not found", Item
, Nam
);
1047 elsif not Analyzed
(Cunit
(Un
))
1048 and then Un
/= Main_Unit
1049 and then not Fatal_Error
(Un
)
1051 Style_Check
:= False;
1052 Semantics
(Cunit
(Un
));
1060 Style_Check
:= Save_Style_Check
;
1061 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
1065 -- Deal with creating elaboration Boolean if needed. We create an
1066 -- elaboration boolean only for units that come from source since
1067 -- units manufactured by the compiler never need elab checks.
1069 if Comes_From_Source
(N
)
1070 and then Nkind_In
(Unit_Node
, N_Package_Declaration
,
1071 N_Generic_Package_Declaration
,
1072 N_Subprogram_Declaration
,
1073 N_Generic_Subprogram_Declaration
)
1076 Loc
: constant Source_Ptr
:= Sloc
(N
);
1077 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Loc
);
1080 Spec_Id
:= Defining_Entity
(Unit_Node
);
1081 Generate_Definition
(Spec_Id
);
1083 -- See if an elaboration entity is required for possible access
1084 -- before elaboration checking. Note that we must allow for this
1085 -- even if -gnatE is not set, since a client may be compiled in
1086 -- -gnatE mode and reference the entity.
1088 -- These entities are also used by the binder to prevent multiple
1089 -- attempts to execute the elaboration code for the library case
1090 -- where the elaboration routine might otherwise be called more
1093 -- Case of units which do not require elaboration checks
1096 -- Pure units do not need checks
1100 -- Preelaborated units do not need checks
1102 or else Is_Preelaborated
(Spec_Id
)
1104 -- No checks needed if pragma Elaborate_Body present
1106 or else Has_Pragma_Elaborate_Body
(Spec_Id
)
1108 -- No checks needed if unit does not require a body
1110 or else not Unit_Requires_Body
(Spec_Id
)
1112 -- No checks needed for predefined files
1114 or else Is_Predefined_File_Name
(Unit_File_Name
(Unum
))
1116 -- No checks required if no separate spec
1118 or else Acts_As_Spec
(N
)
1120 -- This is a case where we only need the entity for
1121 -- checking to prevent multiple elaboration checks.
1123 Set_Elaboration_Entity_Required
(Spec_Id
, False);
1125 -- Case of elaboration entity is required for access before
1126 -- elaboration checking (so certainly we must build it!)
1129 Set_Elaboration_Entity_Required
(Spec_Id
, True);
1132 Build_Elaboration_Entity
(N
, Spec_Id
);
1136 -- Freeze the compilation unit entity. This for sure is needed because
1137 -- of some warnings that can be output (see Freeze_Subprogram), but may
1138 -- in general be required. If freezing actions result, place them in the
1139 -- compilation unit actions list, and analyze them.
1142 Loc
: constant Source_Ptr
:= Sloc
(N
);
1143 L
: constant List_Id
:=
1144 Freeze_Entity
(Cunit_Entity
(Current_Sem_Unit
), Loc
);
1146 while Is_Non_Empty_List
(L
) loop
1147 Insert_Library_Level_Action
(Remove_Head
(L
));
1153 if Nkind
(Unit_Node
) = N_Package_Declaration
1154 and then Get_Cunit_Unit_Number
(N
) /= Main_Unit
1155 and then Expander_Active
1158 Save_Style_Check
: constant Boolean := Style_Check
;
1159 Save_Warning
: constant Warning_Mode_Type
:= Warning_Mode
;
1160 Options
: Style_Check_Options
;
1163 Save_Style_Check_Options
(Options
);
1164 Reset_Style_Check_Options
;
1165 Opt
.Warning_Mode
:= Suppress
;
1166 Check_Body_For_Inlining
(N
, Defining_Entity
(Unit_Node
));
1168 Reset_Style_Check_Options
;
1169 Set_Style_Check_Options
(Options
);
1170 Style_Check
:= Save_Style_Check
;
1171 Warning_Mode
:= Save_Warning
;
1175 -- If we are generating obsolescent warnings, then here is where we
1176 -- generate them for the with'ed items. The reason for this special
1177 -- processing is that the normal mechanism of generating the warnings
1178 -- for referenced entities does not work for context clause references.
1179 -- That's because when we first analyze the context, it is too early to
1180 -- know if the with'ing unit is itself obsolescent (which suppresses
1183 if not GNAT_Mode
and then Warn_On_Obsolescent_Feature
then
1185 -- Push current compilation unit as scope, so that the test for
1186 -- being within an obsolescent unit will work correctly.
1188 Push_Scope
(Defining_Entity
(Unit_Node
));
1190 -- Loop through context items to deal with with clauses
1198 Item
:= First
(Context_Items
(N
));
1199 while Present
(Item
) loop
1200 if Nkind
(Item
) = N_With_Clause
1202 -- Suppress this check in limited-withed units. Further work
1203 -- needed here if we decide to incorporate this check on
1204 -- limited-withed units.
1206 and then not Limited_Present
(Item
)
1209 Ent
:= Entity
(Nam
);
1211 if Is_Obsolescent
(Ent
) then
1212 Output_Obsolescent_Entity_Warnings
(Nam
, Ent
);
1220 -- Remove temporary install of current unit as scope
1224 end Analyze_Compilation_Unit
;
1226 ---------------------
1227 -- Analyze_Context --
1228 ---------------------
1230 procedure Analyze_Context
(N
: Node_Id
) is
1231 Ukind
: constant Node_Kind
:= Nkind
(Unit
(N
));
1235 -- First process all configuration pragmas at the start of the context
1236 -- items. Strictly these are not part of the context clause, but that
1237 -- is where the parser puts them. In any case for sure we must analyze
1238 -- these before analyzing the actual context items, since they can have
1239 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1240 -- be with'ed as a result of changing categorizations in Ada 2005).
1242 Item
:= First
(Context_Items
(N
));
1243 while Present
(Item
)
1244 and then Nkind
(Item
) = N_Pragma
1245 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
1251 -- This is the point at which we capture the configuration settings
1252 -- for the unit. At the moment only the Optimize_Alignment setting
1253 -- needs to be captured. Probably more later ???
1255 if Optimize_Alignment_Local
then
1256 Set_OA_Setting
(Current_Sem_Unit
, 'L');
1258 Set_OA_Setting
(Current_Sem_Unit
, Optimize_Alignment
);
1261 -- Loop through actual context items. This is done in two passes:
1263 -- a) The first pass analyzes non-limited with-clauses and also any
1264 -- configuration pragmas (we need to get the latter analyzed right
1265 -- away, since they can affect processing of subsequent items.
1267 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1269 while Present
(Item
) loop
1271 -- For with clause, analyze the with clause, and then update
1272 -- the version, since we are dependent on a unit that we with.
1274 if Nkind
(Item
) = N_With_Clause
1275 and then not Limited_Present
(Item
)
1277 -- Skip analyzing with clause if no unit, nothing to do (this
1278 -- happens for a with that references a non-existent unit)
1280 if Present
(Library_Unit
(Item
)) then
1284 if not Implicit_With
(Item
) then
1285 Version_Update
(N
, Library_Unit
(Item
));
1288 -- Skip pragmas. Configuration pragmas at the start were handled in
1289 -- the loop above, and remaining pragmas are not processed until we
1290 -- actually install the context (see Install_Context). We delay the
1291 -- analysis of these pragmas to make sure that we have installed all
1292 -- the implicit with's on parent units.
1294 -- Skip use clauses at this stage, since we don't want to do any
1295 -- installing of potentially use visible entities until we
1296 -- actually install the complete context (in Install_Context).
1297 -- Otherwise things can get installed in the wrong context.
1306 -- Second pass: examine all limited_with clauses. All other context
1307 -- items are ignored in this pass.
1309 Item
:= First
(Context_Items
(N
));
1310 while Present
(Item
) loop
1311 if Nkind
(Item
) = N_With_Clause
1312 and then Limited_Present
(Item
)
1314 -- No need to check errors on implicitly generated limited-with
1317 if not Implicit_With
(Item
) then
1319 -- Verify that the illegal contexts given in 10.1.2 (18/2)
1320 -- are properly rejected, including renaming declarations.
1322 if not Nkind_In
(Ukind
, N_Package_Declaration
,
1323 N_Subprogram_Declaration
)
1324 and then Ukind
not in N_Generic_Declaration
1325 and then Ukind
not in N_Generic_Instantiation
1327 Error_Msg_N
("limited with_clause not allowed here", Item
);
1329 -- Check wrong use of a limited with clause applied to the
1330 -- compilation unit containing the limited-with clause.
1332 -- limited with P.Q;
1333 -- package P.Q is ...
1335 elsif Unit
(Library_Unit
(Item
)) = Unit
(N
) then
1336 Error_Msg_N
("wrong use of limited-with clause", Item
);
1338 -- Check wrong use of limited-with clause applied to some
1339 -- immediate ancestor.
1341 elsif Is_Child_Spec
(Unit
(N
)) then
1343 Lib_U
: constant Entity_Id
:= Unit
(Library_Unit
(Item
));
1347 P
:= Parent_Spec
(Unit
(N
));
1349 if Unit
(P
) = Lib_U
then
1350 Error_Msg_N
("limited with_clause of immediate "
1351 & "ancestor not allowed", Item
);
1355 exit when not Is_Child_Spec
(Unit
(P
));
1356 P
:= Parent_Spec
(Unit
(P
));
1361 -- Check if the limited-withed unit is already visible through
1362 -- some context clause of the current compilation unit or some
1363 -- ancestor of the current compilation unit.
1366 Lim_Unit_Name
: constant Node_Id
:= Name
(Item
);
1367 Comp_Unit
: Node_Id
;
1369 Unit_Name
: Node_Id
;
1374 It
:= First
(Context_Items
(Comp_Unit
));
1375 while Present
(It
) loop
1377 and then Nkind
(It
) = N_With_Clause
1378 and then not Limited_Present
(It
)
1380 Nkind_In
(Unit
(Library_Unit
(It
)),
1381 N_Package_Declaration
,
1382 N_Package_Renaming_Declaration
)
1384 if Nkind
(Unit
(Library_Unit
(It
))) =
1385 N_Package_Declaration
1387 Unit_Name
:= Name
(It
);
1389 Unit_Name
:= Name
(Unit
(Library_Unit
(It
)));
1392 -- Check if the named package (or some ancestor)
1393 -- leaves visible the full-view of the unit given
1394 -- in the limited-with clause
1397 if Designate_Same_Unit
(Lim_Unit_Name
,
1400 Error_Msg_Sloc
:= Sloc
(It
);
1402 ("simultaneous visibility of limited "
1403 & "and unlimited views not allowed",
1406 ("\unlimited view visible through "
1407 & "context clause #",
1411 elsif Nkind
(Unit_Name
) = N_Identifier
then
1415 Unit_Name
:= Prefix
(Unit_Name
);
1422 exit when not Is_Child_Spec
(Unit
(Comp_Unit
));
1424 Comp_Unit
:= Parent_Spec
(Unit
(Comp_Unit
));
1429 -- Skip analyzing with clause if no unit, see above
1431 if Present
(Library_Unit
(Item
)) then
1435 -- A limited_with does not impose an elaboration order, but
1436 -- there is a semantic dependency for recompilation purposes.
1438 if not Implicit_With
(Item
) then
1439 Version_Update
(N
, Library_Unit
(Item
));
1442 -- Pragmas and use clauses and with clauses other than limited
1443 -- with's are ignored in this pass through the context items.
1451 end Analyze_Context
;
1453 -------------------------------
1454 -- Analyze_Package_Body_Stub --
1455 -------------------------------
1457 procedure Analyze_Package_Body_Stub
(N
: Node_Id
) is
1458 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1462 -- The package declaration must be in the current declarative part
1464 Check_Stub_Level
(N
);
1465 Nam
:= Current_Entity_In_Scope
(Id
);
1467 if No
(Nam
) or else not Is_Package_Or_Generic_Package
(Nam
) then
1468 Error_Msg_N
("missing specification for package stub", N
);
1470 elsif Has_Completion
(Nam
)
1471 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(Nam
)))
1473 Error_Msg_N
("duplicate or redundant stub for package", N
);
1476 -- Indicate that the body of the package exists. If we are doing
1477 -- only semantic analysis, the stub stands for the body. If we are
1478 -- generating code, the existence of the body will be confirmed
1479 -- when we load the proper body.
1481 Set_Has_Completion
(Nam
);
1482 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1483 Generate_Reference
(Nam
, Id
, 'b');
1484 Analyze_Proper_Body
(N
, Nam
);
1486 end Analyze_Package_Body_Stub
;
1488 -------------------------
1489 -- Analyze_Proper_Body --
1490 -------------------------
1492 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
) is
1493 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
1494 Unum
: Unit_Number_Type
;
1496 procedure Optional_Subunit
;
1497 -- This procedure is called when the main unit is a stub, or when we
1498 -- are not generating code. In such a case, we analyze the subunit if
1499 -- present, which is user-friendly and in fact required for ASIS, but
1500 -- we don't complain if the subunit is missing.
1502 ----------------------
1503 -- Optional_Subunit --
1504 ----------------------
1506 procedure Optional_Subunit
is
1507 Comp_Unit
: Node_Id
;
1510 -- Try to load subunit, but ignore any errors that occur during
1511 -- the loading of the subunit, by using the special feature in
1512 -- Errout to ignore all errors. Note that Fatal_Error will still
1513 -- be set, so we will be able to check for this case below.
1515 if not ASIS_Mode
then
1516 Ignore_Errors_Enable
:= Ignore_Errors_Enable
+ 1;
1521 (Load_Name
=> Subunit_Name
,
1526 if not ASIS_Mode
then
1527 Ignore_Errors_Enable
:= Ignore_Errors_Enable
- 1;
1530 -- All done if we successfully loaded the subunit
1533 and then (not Fatal_Error
(Unum
) or else Try_Semantics
)
1535 Comp_Unit
:= Cunit
(Unum
);
1537 -- If the file was empty or seriously mangled, the unit
1538 -- itself may be missing.
1540 if No
(Unit
(Comp_Unit
)) then
1542 ("subunit does not contain expected proper body", N
);
1544 elsif Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1546 ("expected SEPARATE subunit, found child unit",
1547 Cunit_Entity
(Unum
));
1549 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1550 Analyze_Subunit
(Comp_Unit
);
1551 Set_Library_Unit
(N
, Comp_Unit
);
1554 elsif Unum
= No_Unit
1555 and then Present
(Nam
)
1557 if Is_Protected_Type
(Nam
) then
1558 Set_Corresponding_Body
(Parent
(Nam
), Defining_Identifier
(N
));
1560 Set_Corresponding_Body
(
1561 Unit_Declaration_Node
(Nam
), Defining_Identifier
(N
));
1564 end Optional_Subunit
;
1566 -- Start of processing for Analyze_Proper_Body
1569 -- If the subunit is already loaded, it means that the main unit
1570 -- is a subunit, and that the current unit is one of its parents
1571 -- which was being analyzed to provide the needed context for the
1572 -- analysis of the subunit. In this case we analyze the subunit and
1573 -- continue with the parent, without looking a subsequent subunits.
1575 if Is_Loaded
(Subunit_Name
) then
1577 -- If the proper body is already linked to the stub node,
1578 -- the stub is in a generic unit and just needs analyzing.
1580 if Present
(Library_Unit
(N
)) then
1581 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1582 Analyze_Subunit
(Library_Unit
(N
));
1584 -- Otherwise we must load the subunit and link to it
1587 -- Load the subunit, this must work, since we originally
1588 -- loaded the subunit earlier on. So this will not really
1589 -- load it, just give access to it.
1593 (Load_Name
=> Subunit_Name
,
1598 -- And analyze the subunit in the parent context (note that we
1599 -- do not call Semantics, since that would remove the parent
1600 -- context). Because of this, we have to manually reset the
1601 -- compiler state to Analyzing since it got destroyed by Load.
1603 if Unum
/= No_Unit
then
1604 Compiler_State
:= Analyzing
;
1606 -- Check that the proper body is a subunit and not a child
1607 -- unit. If the unit was previously loaded, the error will
1608 -- have been emitted when copying the generic node, so we
1609 -- just return to avoid cascaded errors.
1611 if Nkind
(Unit
(Cunit
(Unum
))) /= N_Subunit
then
1615 Set_Corresponding_Stub
(Unit
(Cunit
(Unum
)), N
);
1616 Analyze_Subunit
(Cunit
(Unum
));
1617 Set_Library_Unit
(N
, Cunit
(Unum
));
1621 -- If the main unit is a subunit, then we are just performing semantic
1622 -- analysis on that subunit, and any other subunits of any parent unit
1623 -- should be ignored, except that if we are building trees for ASIS
1624 -- usage we want to annotate the stub properly.
1626 elsif Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
1627 and then Subunit_Name
/= Unit_Name
(Main_Unit
)
1633 -- But before we return, set the flag for unloaded subunits. This
1634 -- will suppress junk warnings of variables in the same declarative
1635 -- part (or a higher level one) that are in danger of looking unused
1636 -- when in fact there might be a declaration in the subunit that we
1637 -- do not intend to load.
1639 Unloaded_Subunits
:= True;
1642 -- If the subunit is not already loaded, and we are generating code,
1643 -- then this is the case where compilation started from the parent,
1644 -- and we are generating code for an entire subunit tree. In that
1645 -- case we definitely need to load the subunit.
1647 -- In order to continue the analysis with the rest of the parent,
1648 -- and other subunits, we load the unit without requiring its
1649 -- presence, and emit a warning if not found, rather than terminating
1650 -- the compilation abruptly, as for other missing file problems.
1652 elsif Original_Operating_Mode
= Generate_Code
then
1654 -- If the proper body is already linked to the stub node,
1655 -- the stub is in a generic unit and just needs analyzing.
1657 -- We update the version. Although we are not technically
1658 -- semantically dependent on the subunit, given our approach
1659 -- of macro substitution of subunits, it makes sense to
1660 -- include it in the version identification.
1662 if Present
(Library_Unit
(N
)) then
1663 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1664 Analyze_Subunit
(Library_Unit
(N
));
1665 Version_Update
(Cunit
(Main_Unit
), Library_Unit
(N
));
1667 -- Otherwise we must load the subunit and link to it
1672 (Load_Name
=> Subunit_Name
,
1677 if Original_Operating_Mode
= Generate_Code
1678 and then Unum
= No_Unit
1680 Error_Msg_Unit_1
:= Subunit_Name
;
1682 Get_File_Name
(Subunit_Name
, Subunit
=> True);
1684 ("subunit$$ in file{ not found?", N
);
1685 Subunits_Missing
:= True;
1688 -- Load_Unit may reset Compiler_State, since it may have been
1689 -- necessary to parse an additional units, so we make sure
1690 -- that we reset it to the Analyzing state.
1692 Compiler_State
:= Analyzing
;
1694 if Unum
/= No_Unit
then
1695 if Debug_Flag_L
then
1696 Write_Str
("*** Loaded subunit from stub. Analyze");
1701 Comp_Unit
: constant Node_Id
:= Cunit
(Unum
);
1704 -- Check for child unit instead of subunit
1706 if Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1708 ("expected SEPARATE subunit, found child unit",
1709 Cunit_Entity
(Unum
));
1711 -- OK, we have a subunit
1714 -- Set corresponding stub (even if errors)
1716 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1718 -- Analyze the unit if semantics active
1720 if not Fatal_Error
(Unum
) or else Try_Semantics
then
1721 Analyze_Subunit
(Comp_Unit
);
1724 -- Set the library unit pointer in any case
1726 Set_Library_Unit
(N
, Comp_Unit
);
1728 -- We update the version. Although we are not technically
1729 -- semantically dependent on the subunit, given our
1730 -- approach of macro substitution of subunits, it makes
1731 -- sense to include it in the version identification.
1733 Version_Update
(Cunit
(Main_Unit
), Comp_Unit
);
1739 -- The remaining case is when the subunit is not already loaded and
1740 -- we are not generating code. In this case we are just performing
1741 -- semantic analysis on the parent, and we are not interested in
1742 -- the subunit. For subprograms, analyze the stub as a body. For
1743 -- other entities the stub has already been marked as completed.
1748 end Analyze_Proper_Body
;
1750 ----------------------------------
1751 -- Analyze_Protected_Body_Stub --
1752 ----------------------------------
1754 procedure Analyze_Protected_Body_Stub
(N
: Node_Id
) is
1755 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
1758 Check_Stub_Level
(N
);
1760 -- First occurrence of name may have been as an incomplete type
1762 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
1763 Nam
:= Full_View
(Nam
);
1767 or else not Is_Protected_Type
(Etype
(Nam
))
1769 Error_Msg_N
("missing specification for Protected body", N
);
1771 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1772 Set_Has_Completion
(Etype
(Nam
));
1773 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
1774 Analyze_Proper_Body
(N
, Etype
(Nam
));
1776 end Analyze_Protected_Body_Stub
;
1778 ----------------------------------
1779 -- Analyze_Subprogram_Body_Stub --
1780 ----------------------------------
1782 -- A subprogram body stub can appear with or without a previous
1783 -- specification. If there is one, the analysis of the body will
1784 -- find it and verify conformance. The formals appearing in the
1785 -- specification of the stub play no role, except for requiring an
1786 -- additional conformance check. If there is no previous subprogram
1787 -- declaration, the stub acts as a spec, and provides the defining
1788 -- entity for the subprogram.
1790 procedure Analyze_Subprogram_Body_Stub
(N
: Node_Id
) is
1794 Check_Stub_Level
(N
);
1796 -- Verify that the identifier for the stub is unique within this
1797 -- declarative part.
1799 if Nkind_In
(Parent
(N
), N_Block_Statement
,
1803 Decl
:= First
(Declarations
(Parent
(N
)));
1804 while Present
(Decl
)
1807 if Nkind
(Decl
) = N_Subprogram_Body_Stub
1808 and then (Chars
(Defining_Unit_Name
(Specification
(Decl
))) =
1809 Chars
(Defining_Unit_Name
(Specification
(N
))))
1811 Error_Msg_N
("identifier for stub is not unique", N
);
1818 -- Treat stub as a body, which checks conformance if there is a previous
1819 -- declaration, or else introduces entity and its signature.
1821 Analyze_Subprogram_Body
(N
);
1822 Analyze_Proper_Body
(N
, Empty
);
1823 end Analyze_Subprogram_Body_Stub
;
1825 ---------------------
1826 -- Analyze_Subunit --
1827 ---------------------
1829 -- A subunit is compiled either by itself (for semantic checking)
1830 -- or as part of compiling the parent (for code generation). In
1831 -- either case, by the time we actually process the subunit, the
1832 -- parent has already been installed and analyzed. The node N is
1833 -- a compilation unit, whose context needs to be treated here,
1834 -- because we come directly here from the parent without calling
1835 -- Analyze_Compilation_Unit.
1837 -- The compilation context includes the explicit context of the
1838 -- subunit, and the context of the parent, together with the parent
1839 -- itself. In order to compile the current context, we remove the
1840 -- one inherited from the parent, in order to have a clean visibility
1841 -- table. We restore the parent context before analyzing the proper
1842 -- body itself. On exit, we remove only the explicit context of the
1845 procedure Analyze_Subunit
(N
: Node_Id
) is
1846 Lib_Unit
: constant Node_Id
:= Library_Unit
(N
);
1847 Par_Unit
: constant Entity_Id
:= Current_Scope
;
1849 Lib_Spec
: Node_Id
:= Library_Unit
(Lib_Unit
);
1850 Num_Scopes
: Int
:= 0;
1851 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
1852 Enclosing_Child
: Entity_Id
:= Empty
;
1853 Svg
: constant Suppress_Array
:= Scope_Suppress
;
1855 procedure Analyze_Subunit_Context
;
1856 -- Capture names in use clauses of the subunit. This must be done
1857 -- before re-installing parent declarations, because items in the
1858 -- context must not be hidden by declarations local to the parent.
1860 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
);
1861 -- Recursive procedure to restore scope of all ancestors of subunit,
1862 -- from outermost in. If parent is not a subunit, the call to install
1863 -- context installs context of spec and (if parent is a child unit)
1864 -- the context of its parents as well. It is confusing that parents
1865 -- should be treated differently in both cases, but the semantics are
1866 -- just not identical.
1868 procedure Re_Install_Use_Clauses
;
1869 -- As part of the removal of the parent scope, the use clauses are
1870 -- removed, to be reinstalled when the context of the subunit has
1871 -- been analyzed. Use clauses may also have been affected by the
1872 -- analysis of the context of the subunit, so they have to be applied
1873 -- again, to insure that the compilation environment of the rest of
1874 -- the parent unit is identical.
1876 procedure Remove_Scope
;
1877 -- Remove current scope from scope stack, and preserve the list
1878 -- of use clauses in it, to be reinstalled after context is analyzed.
1880 -----------------------------
1881 -- Analyze_Subunit_Context --
1882 -----------------------------
1884 procedure Analyze_Subunit_Context
is
1887 Unit_Name
: Entity_Id
;
1890 Analyze_Context
(N
);
1892 -- Make withed units immediately visible. If child unit, make the
1893 -- ultimate parent immediately visible.
1895 Item
:= First
(Context_Items
(N
));
1896 while Present
(Item
) loop
1897 if Nkind
(Item
) = N_With_Clause
then
1899 -- Protect frontend against previous errors in context clauses
1901 if Nkind
(Name
(Item
)) /= N_Selected_Component
then
1902 if Error_Posted
(Item
) then
1906 Unit_Name
:= Entity
(Name
(Item
));
1907 while Is_Child_Unit
(Unit_Name
) loop
1908 Set_Is_Visible_Child_Unit
(Unit_Name
);
1909 Unit_Name
:= Scope
(Unit_Name
);
1912 if not Is_Immediately_Visible
(Unit_Name
) then
1913 Set_Is_Immediately_Visible
(Unit_Name
);
1914 Set_Context_Installed
(Item
);
1919 elsif Nkind
(Item
) = N_Use_Package_Clause
then
1920 Nam
:= First
(Names
(Item
));
1921 while Present
(Nam
) loop
1926 elsif Nkind
(Item
) = N_Use_Type_Clause
then
1927 Nam
:= First
(Subtype_Marks
(Item
));
1928 while Present
(Nam
) loop
1937 -- Reset visibility of withed units. They will be made visible
1938 -- again when we install the subunit context.
1940 Item
:= First
(Context_Items
(N
));
1941 while Present
(Item
) loop
1942 if Nkind
(Item
) = N_With_Clause
1944 -- Protect frontend against previous errors in context clauses
1946 and then Nkind
(Name
(Item
)) /= N_Selected_Component
1947 and then not Error_Posted
(Item
)
1949 Unit_Name
:= Entity
(Name
(Item
));
1950 while Is_Child_Unit
(Unit_Name
) loop
1951 Set_Is_Visible_Child_Unit
(Unit_Name
, False);
1952 Unit_Name
:= Scope
(Unit_Name
);
1955 if Context_Installed
(Item
) then
1956 Set_Is_Immediately_Visible
(Unit_Name
, False);
1957 Set_Context_Installed
(Item
, False);
1963 end Analyze_Subunit_Context
;
1965 ------------------------
1966 -- Re_Install_Parents --
1967 ------------------------
1969 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
) is
1973 if Nkind
(Unit
(L
)) = N_Subunit
then
1974 Re_Install_Parents
(Library_Unit
(L
), Scope
(Scop
));
1977 Install_Context
(L
);
1979 -- If the subunit occurs within a child unit, we must restore the
1980 -- immediate visibility of any siblings that may occur in context.
1982 if Present
(Enclosing_Child
) then
1983 Install_Siblings
(Enclosing_Child
, L
);
1988 if Scop
/= Par_Unit
then
1989 Set_Is_Immediately_Visible
(Scop
);
1992 -- Make entities in scope visible again. For child units, restore
1993 -- visibility only if they are actually in context.
1995 E
:= First_Entity
(Current_Scope
);
1996 while Present
(E
) loop
1997 if not Is_Child_Unit
(E
)
1998 or else Is_Visible_Child_Unit
(E
)
2000 Set_Is_Immediately_Visible
(E
);
2006 -- A subunit appears within a body, and for a nested subunits
2007 -- all the parents are bodies. Restore full visibility of their
2008 -- private entities.
2010 if Is_Package_Or_Generic_Package
(Scop
) then
2011 Set_In_Package_Body
(Scop
);
2012 Install_Private_Declarations
(Scop
);
2014 end Re_Install_Parents
;
2016 ----------------------------
2017 -- Re_Install_Use_Clauses --
2018 ----------------------------
2020 procedure Re_Install_Use_Clauses
is
2023 for J
in reverse 1 .. Num_Scopes
loop
2024 U
:= Use_Clauses
(J
);
2025 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:= U
;
2026 Install_Use_Clauses
(U
, Force_Installation
=> True);
2028 end Re_Install_Use_Clauses
;
2034 procedure Remove_Scope
is
2038 Num_Scopes
:= Num_Scopes
+ 1;
2039 Use_Clauses
(Num_Scopes
) :=
2040 Scope_Stack
.Table
(Scope_Stack
.Last
).First_Use_Clause
;
2042 E
:= First_Entity
(Current_Scope
);
2043 while Present
(E
) loop
2044 Set_Is_Immediately_Visible
(E
, False);
2048 if Is_Child_Unit
(Current_Scope
) then
2049 Enclosing_Child
:= Current_Scope
;
2055 -- Start of processing for Analyze_Subunit
2058 if not Is_Empty_List
(Context_Items
(N
)) then
2060 -- Save current use clauses
2063 Remove_Context
(Lib_Unit
);
2065 -- Now remove parents and their context, including enclosing
2066 -- subunits and the outer parent body which is not a subunit.
2068 if Present
(Lib_Spec
) then
2069 Remove_Context
(Lib_Spec
);
2071 while Nkind
(Unit
(Lib_Spec
)) = N_Subunit
loop
2072 Lib_Spec
:= Library_Unit
(Lib_Spec
);
2074 Remove_Context
(Lib_Spec
);
2077 if Nkind
(Unit
(Lib_Unit
)) = N_Subunit
then
2081 if Nkind
(Unit
(Lib_Spec
)) = N_Package_Body
then
2082 Remove_Context
(Library_Unit
(Lib_Spec
));
2086 Set_Is_Immediately_Visible
(Par_Unit
, False);
2088 Analyze_Subunit_Context
;
2090 Re_Install_Parents
(Lib_Unit
, Par_Unit
);
2091 Set_Is_Immediately_Visible
(Par_Unit
);
2093 -- If the context includes a child unit of the parent of the
2094 -- subunit, the parent will have been removed from visibility,
2095 -- after compiling that cousin in the context. The visibility
2096 -- of the parent must be restored now. This also applies if the
2097 -- context includes another subunit of the same parent which in
2098 -- turn includes a child unit in its context.
2100 if Is_Package_Or_Generic_Package
(Par_Unit
) then
2101 if not Is_Immediately_Visible
(Par_Unit
)
2102 or else (Present
(First_Entity
(Par_Unit
))
2103 and then not Is_Immediately_Visible
2104 (First_Entity
(Par_Unit
)))
2106 Set_Is_Immediately_Visible
(Par_Unit
);
2107 Install_Visible_Declarations
(Par_Unit
);
2108 Install_Private_Declarations
(Par_Unit
);
2112 Re_Install_Use_Clauses
;
2113 Install_Context
(N
);
2115 -- Restore state of suppress flags for current body
2117 Scope_Suppress
:= Svg
;
2119 -- If the subunit is within a child unit, then siblings of any
2120 -- parent unit that appear in the context clause of the subunit
2121 -- must also be made immediately visible.
2123 if Present
(Enclosing_Child
) then
2124 Install_Siblings
(Enclosing_Child
, N
);
2129 Analyze
(Proper_Body
(Unit
(N
)));
2132 -- The subunit may contain a with_clause on a sibling of some
2133 -- ancestor. Removing the context will remove from visibility those
2134 -- ancestor child units, which must be restored to the visibility
2135 -- they have in the enclosing body.
2137 if Present
(Enclosing_Child
) then
2143 and then Is_Child_Unit
(C
)
2145 Set_Is_Immediately_Visible
(C
);
2146 Set_Is_Visible_Child_Unit
(C
);
2151 end Analyze_Subunit
;
2153 ----------------------------
2154 -- Analyze_Task_Body_Stub --
2155 ----------------------------
2157 procedure Analyze_Task_Body_Stub
(N
: Node_Id
) is
2158 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
2159 Loc
: constant Source_Ptr
:= Sloc
(N
);
2162 Check_Stub_Level
(N
);
2164 -- First occurrence of name may have been as an incomplete type
2166 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
2167 Nam
:= Full_View
(Nam
);
2171 or else not Is_Task_Type
(Etype
(Nam
))
2173 Error_Msg_N
("missing specification for task body", N
);
2175 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
2176 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
2177 Set_Has_Completion
(Etype
(Nam
));
2178 Analyze_Proper_Body
(N
, Etype
(Nam
));
2180 -- Set elaboration flag to indicate that entity is callable.
2181 -- This cannot be done in the expansion of the body itself,
2182 -- because the proper body is not in a declarative part. This
2183 -- is only done if expansion is active, because the context
2184 -- may be generic and the flag not defined yet.
2186 if Expander_Active
then
2188 Make_Assignment_Statement
(Loc
,
2190 Make_Identifier
(Loc
,
2191 New_External_Name
(Chars
(Etype
(Nam
)), 'E')),
2192 Expression
=> New_Reference_To
(Standard_True
, Loc
)));
2196 end Analyze_Task_Body_Stub
;
2198 -------------------------
2199 -- Analyze_With_Clause --
2200 -------------------------
2202 -- Analyze the declaration of a unit in a with clause. At end,
2203 -- label the with clause with the defining entity for the unit.
2205 procedure Analyze_With_Clause
(N
: Node_Id
) is
2207 -- Retrieve the original kind of the unit node, before analysis.
2208 -- If it is a subprogram instantiation, its analysis below will
2209 -- rewrite as the declaration of the wrapper package. If the same
2210 -- instantiation appears indirectly elsewhere in the context, it
2211 -- will have been analyzed already.
2213 Unit_Kind
: constant Node_Kind
:=
2214 Nkind
(Original_Node
(Unit
(Library_Unit
(N
))));
2215 Nam
: constant Node_Id
:= Name
(N
);
2217 Par_Name
: Entity_Id
;
2222 -- Set True if the unit currently being compiled is an internal unit
2224 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
2225 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
2226 Cunit_Boolean_Restrictions_Save
;
2229 U
:= Unit
(Library_Unit
(N
));
2231 -- Several actions are skipped for dummy packages (those supplied for
2232 -- with's where no matching file could be found). Such packages are
2233 -- identified by the Sloc value being set to No_Location.
2235 if Limited_Present
(N
) then
2237 -- Ada 2005 (AI-50217): Build visibility structures but do not
2238 -- analyze the unit.
2240 if Sloc
(U
) /= No_Location
then
2241 Build_Limited_Views
(N
);
2247 -- We reset ordinary style checking during the analysis of a with'ed
2248 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2249 -- definitely *does* apply to with'ed units).
2251 if not GNAT_Mode
then
2252 Style_Check
:= False;
2255 -- If the library unit is a predefined unit, and we are in high
2256 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2257 -- for the analysis of the with'ed unit. This mode does not prevent
2258 -- explicit with'ing of run-time units.
2260 if Configurable_Run_Time_Mode
2262 Is_Predefined_File_Name
2263 (Unit_File_Name
(Get_Source_Unit
(Unit
(Library_Unit
(N
)))))
2265 Configurable_Run_Time_Mode
:= False;
2266 Semantics
(Library_Unit
(N
));
2267 Configurable_Run_Time_Mode
:= True;
2270 Semantics
(Library_Unit
(N
));
2273 Intunit
:= Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
));
2275 if Sloc
(U
) /= No_Location
then
2277 -- Check restrictions, except that we skip the check if this is an
2278 -- internal unit unless we are compiling the internal unit as the
2279 -- main unit. We also skip this for dummy packages.
2281 Check_Restriction_No_Dependence
(Nam
, N
);
2283 if not Intunit
or else Current_Sem_Unit
= Main_Unit
then
2284 Check_Restricted_Unit
(Unit_Name
(Get_Source_Unit
(U
)), N
);
2287 -- Deal with special case of GNAT.Current_Exceptions which interacts
2288 -- with the optimization of local raise statements into gotos.
2290 if Nkind
(Nam
) = N_Selected_Component
2291 and then Nkind
(Prefix
(Nam
)) = N_Identifier
2292 and then Chars
(Prefix
(Nam
)) = Name_Gnat
2293 and then (Chars
(Selector_Name
(Nam
)) = Name_Most_Recent_Exception
2295 Chars
(Selector_Name
(Nam
)) = Name_Exception_Traces
)
2297 Check_Restriction
(No_Exception_Propagation
, N
);
2298 Special_Exception_Package_Used
:= True;
2301 -- Check for inappropriate with of internal implementation unit if we
2302 -- are currently compiling the main unit and the main unit is itself
2303 -- not an internal unit. We do not issue this message for implicit
2304 -- with's generated by the compiler itself.
2306 if Implementation_Unit_Warnings
2307 and then Current_Sem_Unit
= Main_Unit
2308 and then not Intunit
2309 and then not Implicit_With
(N
)
2310 and then not GNAT_Mode
2313 U_Kind
: constant Kind_Of_Unit
:=
2314 Get_Kind_Of_Unit
(Get_Source_Unit
(U
));
2317 if U_Kind
= Implementation_Unit
then
2318 Error_Msg_F
("& is an internal 'G'N'A'T unit?", Name
(N
));
2320 ("\use of this unit is non-portable " &
2321 "and version-dependent?",
2324 elsif U_Kind
= Ada_05_Unit
2325 and then Ada_Version
< Ada_05
2326 and then Warn_On_Ada_2005_Compatibility
2328 Error_Msg_N
("& is an Ada 2005 unit?", Name
(N
));
2334 -- Semantic analysis of a generic unit is performed on a copy of
2335 -- the original tree. Retrieve the entity on which semantic info
2336 -- actually appears.
2338 if Unit_Kind
in N_Generic_Declaration
then
2339 E_Name
:= Defining_Entity
(U
);
2341 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2342 -- the case of an instantiation, semantic analysis above will have
2343 -- replaced the unit by its instantiated version. If the instance body
2344 -- has been generated, the instance now denotes the body entity. For
2345 -- visibility purposes we need the entity of its spec.
2347 elsif (Unit_Kind
= N_Package_Instantiation
2348 or else Nkind
(Original_Node
(Unit
(Library_Unit
(N
)))) =
2349 N_Package_Instantiation
)
2350 and then Nkind
(U
) = N_Package_Body
2352 E_Name
:= Corresponding_Spec
(U
);
2354 elsif Unit_Kind
= N_Package_Instantiation
2355 and then Nkind
(U
) = N_Package_Instantiation
2357 -- If the instance has not been rewritten as a package declaration,
2358 -- then it appeared already in a previous with clause. Retrieve
2359 -- the entity from the previous instance.
2361 E_Name
:= Defining_Entity
(Specification
(Instance_Spec
(U
)));
2363 elsif Unit_Kind
in N_Subprogram_Instantiation
then
2365 -- Instantiation node is replaced with a wrapper package. Retrieve
2366 -- the visible subprogram created by the instance from corresponding
2367 -- attribute of the wrapper.
2369 E_Name
:= Related_Instance
(Defining_Entity
(U
));
2371 elsif Unit_Kind
= N_Package_Renaming_Declaration
2372 or else Unit_Kind
in N_Generic_Renaming_Declaration
2374 E_Name
:= Defining_Entity
(U
);
2376 elsif Unit_Kind
= N_Subprogram_Body
2377 and then Nkind
(Name
(N
)) = N_Selected_Component
2378 and then not Acts_As_Spec
(Library_Unit
(N
))
2380 -- For a child unit that has no spec, one has been created and
2381 -- analyzed. The entity required is that of the spec.
2383 E_Name
:= Corresponding_Spec
(U
);
2386 E_Name
:= Defining_Entity
(U
);
2389 if Nkind
(Name
(N
)) = N_Selected_Component
then
2391 -- Child unit in a with clause
2393 Change_Selected_Component_To_Expanded_Name
(Name
(N
));
2396 -- Restore style checks and restrictions
2398 Style_Check
:= Save_Style_Check
;
2399 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
2401 -- Record the reference, but do NOT set the unit as referenced, we want
2402 -- to consider the unit as unreferenced if this is the only reference
2405 Set_Entity_With_Style_Check
(Name
(N
), E_Name
);
2406 Generate_Reference
(E_Name
, Name
(N
), 'w', Set_Ref
=> False);
2408 if Is_Child_Unit
(E_Name
) then
2409 Pref
:= Prefix
(Name
(N
));
2410 Par_Name
:= Scope
(E_Name
);
2411 while Nkind
(Pref
) = N_Selected_Component
loop
2412 Change_Selected_Component_To_Expanded_Name
(Pref
);
2413 Set_Entity_With_Style_Check
(Pref
, Par_Name
);
2415 Generate_Reference
(Par_Name
, Pref
);
2416 Pref
:= Prefix
(Pref
);
2418 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2419 -- is set to Standard_Standard, and no attempt should be made to
2420 -- further unwind scopes.
2422 if Par_Name
/= Standard_Standard
then
2423 Par_Name
:= Scope
(Par_Name
);
2427 if Present
(Entity
(Pref
))
2428 and then not Analyzed
(Parent
(Parent
(Entity
(Pref
))))
2430 -- If the entity is set without its unit being compiled, the
2431 -- original parent is a renaming, and Par_Name is the renamed
2432 -- entity. For visibility purposes, we need the original entity,
2433 -- which must be analyzed now because Load_Unit directly retrieves
2434 -- the renamed unit, and the renaming declaration itself has not
2437 Analyze
(Parent
(Parent
(Entity
(Pref
))));
2438 pragma Assert
(Renamed_Object
(Entity
(Pref
)) = Par_Name
);
2439 Par_Name
:= Entity
(Pref
);
2442 Set_Entity_With_Style_Check
(Pref
, Par_Name
);
2443 Generate_Reference
(Par_Name
, Pref
);
2446 -- If the withed unit is System, and a system extension pragma is
2447 -- present, compile the extension now, rather than waiting for a
2448 -- visibility check on a specific entity.
2450 if Chars
(E_Name
) = Name_System
2451 and then Scope
(E_Name
) = Standard_Standard
2452 and then Present
(System_Extend_Unit
)
2453 and then Present_System_Aux
(N
)
2455 -- If the extension is not present, an error will have been emitted
2460 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2461 -- to private_with units; they will be made visible later (just before
2462 -- the private part is analyzed)
2464 if Private_Present
(N
) then
2465 Set_Is_Immediately_Visible
(E_Name
, False);
2467 end Analyze_With_Clause
;
2469 ------------------------------
2470 -- Check_Private_Child_Unit --
2471 ------------------------------
2473 procedure Check_Private_Child_Unit
(N
: Node_Id
) is
2474 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2476 Curr_Unit
: Entity_Id
;
2477 Sub_Parent
: Node_Id
;
2478 Priv_Child
: Entity_Id
;
2479 Par_Lib
: Entity_Id
;
2482 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean;
2483 -- Returns true if and only if the library unit is declared with
2484 -- an explicit designation of private.
2486 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean is
2487 Comp_Unit
: constant Node_Id
:= Parent
(Unit_Declaration_Node
(Unit
));
2490 return Private_Present
(Comp_Unit
);
2491 end Is_Private_Library_Unit
;
2493 -- Start of processing for Check_Private_Child_Unit
2496 if Nkind_In
(Lib_Unit
, N_Package_Body
, N_Subprogram_Body
) then
2497 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(N
)));
2498 Par_Lib
:= Curr_Unit
;
2500 elsif Nkind
(Lib_Unit
) = N_Subunit
then
2502 -- The parent is itself a body. The parent entity is to be found in
2503 -- the corresponding spec.
2505 Sub_Parent
:= Library_Unit
(N
);
2506 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(Sub_Parent
)));
2508 -- If the parent itself is a subunit, Curr_Unit is the entity
2509 -- of the enclosing body, retrieve the spec entity which is
2510 -- the proper ancestor we need for the following tests.
2512 if Ekind
(Curr_Unit
) = E_Package_Body
then
2513 Curr_Unit
:= Spec_Entity
(Curr_Unit
);
2516 Par_Lib
:= Curr_Unit
;
2519 Curr_Unit
:= Defining_Entity
(Lib_Unit
);
2521 Par_Lib
:= Curr_Unit
;
2522 Par_Spec
:= Parent_Spec
(Lib_Unit
);
2524 if No
(Par_Spec
) then
2527 Par_Lib
:= Defining_Entity
(Unit
(Par_Spec
));
2531 -- Loop through context items
2533 Item
:= First
(Context_Items
(N
));
2534 while Present
(Item
) loop
2536 -- Ada 2005 (AI-262): Allow private_with of a private child package
2537 -- in public siblings
2539 if Nkind
(Item
) = N_With_Clause
2540 and then not Implicit_With
(Item
)
2541 and then not Limited_Present
(Item
)
2542 and then Is_Private_Descendant
(Entity
(Name
(Item
)))
2544 Priv_Child
:= Entity
(Name
(Item
));
2547 Curr_Parent
: Entity_Id
:= Par_Lib
;
2548 Child_Parent
: Entity_Id
:= Scope
(Priv_Child
);
2549 Prv_Ancestor
: Entity_Id
:= Child_Parent
;
2550 Curr_Private
: Boolean := Is_Private_Library_Unit
(Curr_Unit
);
2553 -- If the child unit is a public child then locate the nearest
2554 -- private ancestor. Child_Parent will then be set to the
2555 -- parent of that ancestor.
2557 if not Is_Private_Library_Unit
(Priv_Child
) then
2558 while Present
(Prv_Ancestor
)
2559 and then not Is_Private_Library_Unit
(Prv_Ancestor
)
2561 Prv_Ancestor
:= Scope
(Prv_Ancestor
);
2564 if Present
(Prv_Ancestor
) then
2565 Child_Parent
:= Scope
(Prv_Ancestor
);
2569 while Present
(Curr_Parent
)
2570 and then Curr_Parent
/= Standard_Standard
2571 and then Curr_Parent
/= Child_Parent
2574 Curr_Private
or else Is_Private_Library_Unit
(Curr_Parent
);
2575 Curr_Parent
:= Scope
(Curr_Parent
);
2578 if No
(Curr_Parent
) then
2579 Curr_Parent
:= Standard_Standard
;
2582 if Curr_Parent
/= Child_Parent
then
2583 if Ekind
(Priv_Child
) = E_Generic_Package
2584 and then Chars
(Priv_Child
) in Text_IO_Package_Name
2585 and then Chars
(Scope
(Scope
(Priv_Child
))) = Name_Ada
2588 ("& is a nested package, not a compilation unit",
2589 Name
(Item
), Priv_Child
);
2593 ("unit in with clause is private child unit!", Item
);
2595 ("\current unit must also have parent&!",
2596 Item
, Child_Parent
);
2600 or else Private_Present
(Item
)
2601 or else Nkind_In
(Lib_Unit
, N_Package_Body
, N_Subunit
)
2602 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
2603 and then not Acts_As_Spec
(Parent
(Lib_Unit
)))
2609 ("current unit must also be private descendant of&",
2610 Item
, Child_Parent
);
2618 end Check_Private_Child_Unit
;
2620 ----------------------
2621 -- Check_Stub_Level --
2622 ----------------------
2624 procedure Check_Stub_Level
(N
: Node_Id
) is
2625 Par
: constant Node_Id
:= Parent
(N
);
2626 Kind
: constant Node_Kind
:= Nkind
(Par
);
2629 if Nkind_In
(Kind
, N_Package_Body
,
2633 and then Nkind_In
(Parent
(Par
), N_Compilation_Unit
, N_Subunit
)
2637 -- In an instance, a missing stub appears at any level. A warning
2638 -- message will have been emitted already for the missing file.
2640 elsif not In_Instance
then
2641 Error_Msg_N
("stub cannot appear in an inner scope", N
);
2643 elsif Expander_Active
then
2644 Error_Msg_N
("missing proper body", N
);
2646 end Check_Stub_Level
;
2648 ------------------------
2649 -- Expand_With_Clause --
2650 ------------------------
2652 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
) is
2653 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
2654 Ent
: constant Entity_Id
:= Entity
(Nam
);
2658 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
;
2659 -- Build name to be used in implicit with_clause. In most cases this
2660 -- is the source name, but if renamings are present we must make the
2661 -- original unit visible, not the one it renames. The entity in the
2662 -- with clause is the renamed unit, but the identifier is the one from
2663 -- the source, which allows us to recover the unit renaming.
2665 ---------------------
2666 -- Build_Unit_Name --
2667 ---------------------
2669 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
is
2671 Renaming
: Entity_Id
;
2675 if Nkind
(Nam
) = N_Identifier
then
2677 -- If the parent unit P in the name of the with_clause for P.Q
2678 -- is a renaming of package R, then the entity of the parent is
2679 -- set to R, but the identifier retains Chars (P) to be consistent
2680 -- with the source (see details in lib-load). However, the
2681 -- implicit_with_clause for the parent must make the entity for
2682 -- P visible, because P.Q may be used as a prefix within the
2683 -- current unit. The entity for P is the current_entity with that
2684 -- name, because the package renaming declaration for it has just
2685 -- been analyzed. Note that this case can only happen if P.Q has
2686 -- already appeared in a previous with_clause in a related unit,
2687 -- such as the library body of the current unit.
2689 if Chars
(Nam
) /= Chars
(Entity
(Nam
)) then
2690 Renaming
:= Current_Entity
(Nam
);
2691 pragma Assert
(Renamed_Entity
(Renaming
) = Entity
(Nam
));
2692 return New_Occurrence_Of
(Renaming
, Loc
);
2695 return New_Occurrence_Of
(Entity
(Nam
), Loc
);
2699 Ent
:= Entity
(Nam
);
2701 if Present
(Entity
(Selector_Name
(Nam
)))
2702 and then Chars
(Entity
(Selector_Name
(Nam
))) /= Chars
(Ent
)
2704 Nkind
(Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
))))
2705 = N_Package_Renaming_Declaration
2707 -- The name in the with_clause is of the form A.B.C, and B
2708 -- is given by a renaming declaration. In that case we may
2709 -- not have analyzed the unit for B, but replaced it directly
2710 -- in lib-load with the unit it renames. We have to make A.B
2711 -- visible, so analyze the declaration for B now, in case it
2712 -- has not been done yet.
2714 Ent
:= Entity
(Selector_Name
(Nam
));
2717 (Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
)))));
2721 Make_Expanded_Name
(Loc
,
2722 Chars
=> Chars
(Entity
(Nam
)),
2723 Prefix
=> Build_Unit_Name
(Prefix
(Nam
)),
2724 Selector_Name
=> New_Occurrence_Of
(Ent
, Loc
));
2725 Set_Entity
(Result
, Ent
);
2728 end Build_Unit_Name
;
2730 -- Start of processing for Expand_With_Clause
2733 New_Nodes_OK
:= New_Nodes_OK
+ 1;
2735 Make_With_Clause
(Loc
,
2736 Name
=> Build_Unit_Name
(Nam
));
2738 P
:= Parent
(Unit_Declaration_Node
(Ent
));
2739 Set_Library_Unit
(Withn
, P
);
2740 Set_Corresponding_Spec
(Withn
, Ent
);
2741 Set_First_Name
(Withn
, True);
2742 Set_Implicit_With
(Withn
, True);
2744 -- If the unit is a package declaration, a private_with_clause on a
2745 -- child unit implies that the implicit with on the parent is also
2748 if Nkind
(Unit
(N
)) = N_Package_Declaration
then
2749 Set_Private_Present
(Withn
, Private_Present
(Item
));
2752 Prepend
(Withn
, Context_Items
(N
));
2753 Mark_Rewrite_Insertion
(Withn
);
2754 Install_Withed_Unit
(Withn
);
2756 if Nkind
(Nam
) = N_Expanded_Name
then
2757 Expand_With_Clause
(Item
, Prefix
(Nam
), N
);
2760 New_Nodes_OK
:= New_Nodes_OK
- 1;
2761 end Expand_With_Clause
;
2763 -----------------------
2764 -- Get_Parent_Entity --
2765 -----------------------
2767 function Get_Parent_Entity
(Unit
: Node_Id
) return Entity_Id
is
2769 if Nkind
(Unit
) = N_Package_Body
2770 and then Nkind
(Original_Node
(Unit
)) = N_Package_Instantiation
2772 return Defining_Entity
2773 (Specification
(Instance_Spec
(Original_Node
(Unit
))));
2774 elsif Nkind
(Unit
) = N_Package_Instantiation
then
2775 return Defining_Entity
(Specification
(Instance_Spec
(Unit
)));
2777 return Defining_Entity
(Unit
);
2779 end Get_Parent_Entity
;
2781 -----------------------------
2782 -- Implicit_With_On_Parent --
2783 -----------------------------
2785 procedure Implicit_With_On_Parent
2786 (Child_Unit
: Node_Id
;
2789 Loc
: constant Source_Ptr
:= Sloc
(N
);
2790 P
: constant Node_Id
:= Parent_Spec
(Child_Unit
);
2791 P_Unit
: Node_Id
:= Unit
(P
);
2792 P_Name
: constant Entity_Id
:= Get_Parent_Entity
(P_Unit
);
2795 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
;
2796 -- Build prefix of child unit name. Recurse if needed
2798 function Build_Unit_Name
return Node_Id
;
2799 -- If the unit is a child unit, build qualified name with all ancestors
2801 -------------------------
2802 -- Build_Ancestor_Name --
2803 -------------------------
2805 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
is
2806 P_Ref
: constant Node_Id
:=
2807 New_Reference_To
(Defining_Entity
(P
), Loc
);
2808 P_Spec
: Node_Id
:= P
;
2811 -- Ancestor may have been rewritten as a package body. Retrieve
2812 -- the original spec to trace earlier ancestors.
2814 if Nkind
(P
) = N_Package_Body
2815 and then Nkind
(Original_Node
(P
)) = N_Package_Instantiation
2817 P_Spec
:= Original_Node
(P
);
2820 if No
(Parent_Spec
(P_Spec
)) then
2824 Make_Selected_Component
(Loc
,
2825 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Spec
))),
2826 Selector_Name
=> P_Ref
);
2828 end Build_Ancestor_Name
;
2830 ---------------------
2831 -- Build_Unit_Name --
2832 ---------------------
2834 function Build_Unit_Name
return Node_Id
is
2837 if No
(Parent_Spec
(P_Unit
)) then
2838 return New_Reference_To
(P_Name
, Loc
);
2841 Make_Expanded_Name
(Loc
,
2842 Chars
=> Chars
(P_Name
),
2843 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Unit
))),
2844 Selector_Name
=> New_Reference_To
(P_Name
, Loc
));
2845 Set_Entity
(Result
, P_Name
);
2848 end Build_Unit_Name
;
2850 -- Start of processing for Implicit_With_On_Parent
2853 -- The unit of the current compilation may be a package body that
2854 -- replaces an instance node. In this case we need the original instance
2855 -- node to construct the proper parent name.
2857 if Nkind
(P_Unit
) = N_Package_Body
2858 and then Nkind
(Original_Node
(P_Unit
)) = N_Package_Instantiation
2860 P_Unit
:= Original_Node
(P_Unit
);
2863 -- We add the implicit with if the child unit is the current unit being
2864 -- compiled. If the current unit is a body, we do not want to add an
2865 -- implicit_with a second time to the corresponding spec.
2867 if Nkind
(Child_Unit
) = N_Package_Declaration
2868 and then Child_Unit
/= Unit
(Cunit
(Current_Sem_Unit
))
2873 New_Nodes_OK
:= New_Nodes_OK
+ 1;
2874 Withn
:= Make_With_Clause
(Loc
, Name
=> Build_Unit_Name
);
2876 Set_Library_Unit
(Withn
, P
);
2877 Set_Corresponding_Spec
(Withn
, P_Name
);
2878 Set_First_Name
(Withn
, True);
2879 Set_Implicit_With
(Withn
, True);
2881 -- Node is placed at the beginning of the context items, so that
2882 -- subsequent use clauses on the parent can be validated.
2884 Prepend
(Withn
, Context_Items
(N
));
2885 Mark_Rewrite_Insertion
(Withn
);
2886 Install_Withed_Unit
(Withn
);
2888 if Is_Child_Spec
(P_Unit
) then
2889 Implicit_With_On_Parent
(P_Unit
, N
);
2892 New_Nodes_OK
:= New_Nodes_OK
- 1;
2893 end Implicit_With_On_Parent
;
2899 function In_Chain
(E
: Entity_Id
) return Boolean is
2903 H
:= Current_Entity
(E
);
2904 while Present
(H
) loop
2915 ---------------------
2916 -- Install_Context --
2917 ---------------------
2919 procedure Install_Context
(N
: Node_Id
) is
2920 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2923 Install_Context_Clauses
(N
);
2925 if Is_Child_Spec
(Lib_Unit
) then
2926 Install_Parents
(Lib_Unit
, Private_Present
(Parent
(Lib_Unit
)));
2929 Install_Limited_Context_Clauses
(N
);
2930 end Install_Context
;
2932 -----------------------------
2933 -- Install_Context_Clauses --
2934 -----------------------------
2936 procedure Install_Context_Clauses
(N
: Node_Id
) is
2937 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2939 Uname_Node
: Entity_Id
;
2940 Check_Private
: Boolean := False;
2941 Decl_Node
: Node_Id
;
2942 Lib_Parent
: Entity_Id
;
2945 -- First skip configuration pragmas at the start of the context. They
2946 -- are not technically part of the context clause, but that's where the
2947 -- parser puts them. Note they were analyzed in Analyze_Context.
2949 Item
:= First
(Context_Items
(N
));
2950 while Present
(Item
)
2951 and then Nkind
(Item
) = N_Pragma
2952 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
2957 -- Loop through the actual context clause items. We process everything
2958 -- except Limited_With clauses in this routine. Limited_With clauses
2959 -- are separately installed (see Install_Limited_Context_Clauses).
2961 while Present
(Item
) loop
2963 -- Case of explicit WITH clause
2965 if Nkind
(Item
) = N_With_Clause
2966 and then not Implicit_With
(Item
)
2968 if Limited_Present
(Item
) then
2970 -- Limited withed units will be installed later
2974 -- If Name (Item) is not an entity name, something is wrong, and
2975 -- this will be detected in due course, for now ignore the item
2977 elsif not Is_Entity_Name
(Name
(Item
)) then
2980 elsif No
(Entity
(Name
(Item
))) then
2981 Set_Entity
(Name
(Item
), Any_Id
);
2985 Uname_Node
:= Entity
(Name
(Item
));
2987 if Is_Private_Descendant
(Uname_Node
) then
2988 Check_Private
:= True;
2991 Install_Withed_Unit
(Item
);
2993 Decl_Node
:= Unit_Declaration_Node
(Uname_Node
);
2995 -- If the unit is a subprogram instance, it appears nested within
2996 -- a package that carries the parent information.
2998 if Is_Generic_Instance
(Uname_Node
)
2999 and then Ekind
(Uname_Node
) /= E_Package
3001 Decl_Node
:= Parent
(Parent
(Decl_Node
));
3004 if Is_Child_Spec
(Decl_Node
) then
3005 if Nkind
(Name
(Item
)) = N_Expanded_Name
then
3006 Expand_With_Clause
(Item
, Prefix
(Name
(Item
)), N
);
3008 -- If not an expanded name, the child unit must be a
3009 -- renaming, nothing to do.
3014 elsif Nkind
(Decl_Node
) = N_Subprogram_Body
3015 and then not Acts_As_Spec
(Parent
(Decl_Node
))
3016 and then Is_Child_Spec
(Unit
(Library_Unit
(Parent
(Decl_Node
))))
3018 Implicit_With_On_Parent
3019 (Unit
(Library_Unit
(Parent
(Decl_Node
))), N
);
3022 -- Check license conditions unless this is a dummy unit
3024 if Sloc
(Library_Unit
(Item
)) /= No_Location
then
3025 License_Check
: declare
3027 Withu
: constant Unit_Number_Type
:=
3028 Get_Source_Unit
(Library_Unit
(Item
));
3030 Withl
: constant License_Type
:=
3031 License
(Source_Index
(Withu
));
3033 Unitl
: constant License_Type
:=
3034 License
(Source_Index
(Current_Sem_Unit
));
3036 procedure License_Error
;
3037 -- Signal error of bad license
3043 procedure License_Error
is
3046 ("?license of with'ed unit & may be inconsistent",
3050 -- Start of processing for License_Check
3053 -- Exclude license check if withed unit is an internal unit.
3054 -- This situation arises e.g. with the GPL version of GNAT.
3056 if Is_Internal_File_Name
(Unit_File_Name
(Withu
)) then
3059 -- Otherwise check various cases
3071 if Withl
= Restricted
then
3075 when Modified_GPL
=>
3076 if Withl
= Restricted
or else Withl
= GPL
then
3080 when Unrestricted
=>
3087 -- Case of USE PACKAGE clause
3089 elsif Nkind
(Item
) = N_Use_Package_Clause
then
3090 Analyze_Use_Package
(Item
);
3092 -- Case of USE TYPE clause
3094 elsif Nkind
(Item
) = N_Use_Type_Clause
then
3095 Analyze_Use_Type
(Item
);
3099 elsif Nkind
(Item
) = N_Pragma
then
3107 if Is_Child_Spec
(Lib_Unit
) then
3109 -- The unit also has implicit withs on its own parents
3111 if No
(Context_Items
(N
)) then
3112 Set_Context_Items
(N
, New_List
);
3115 Implicit_With_On_Parent
(Lib_Unit
, N
);
3118 -- If the unit is a body, the context of the specification must also
3121 if Nkind
(Lib_Unit
) = N_Package_Body
3122 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
3123 and then not Acts_As_Spec
(N
))
3125 Install_Context
(Library_Unit
(N
));
3127 if Is_Child_Spec
(Unit
(Library_Unit
(N
))) then
3129 -- If the unit is the body of a public child unit, the private
3130 -- declarations of the parent must be made visible. If the child
3131 -- unit is private, the private declarations have been installed
3132 -- already in the call to Install_Parents for the spec. Installing
3133 -- private declarations must be done for all ancestors of public
3134 -- child units. In addition, sibling units mentioned in the
3135 -- context clause of the body are directly visible.
3143 Lib_Spec
:= Unit
(Library_Unit
(N
));
3144 while Is_Child_Spec
(Lib_Spec
) loop
3145 P
:= Unit
(Parent_Spec
(Lib_Spec
));
3146 P_Name
:= Defining_Entity
(P
);
3148 if not (Private_Present
(Parent
(Lib_Spec
)))
3149 and then not In_Private_Part
(P_Name
)
3151 Install_Private_Declarations
(P_Name
);
3152 Install_Private_With_Clauses
(P_Name
);
3153 Set_Use
(Private_Declarations
(Specification
(P
)));
3161 -- For a package body, children in context are immediately visible
3163 Install_Siblings
(Defining_Entity
(Unit
(Library_Unit
(N
))), N
);
3166 if Nkind_In
(Lib_Unit
, N_Generic_Package_Declaration
,
3167 N_Generic_Subprogram_Declaration
,
3168 N_Package_Declaration
,
3169 N_Subprogram_Declaration
)
3171 if Is_Child_Spec
(Lib_Unit
) then
3172 Lib_Parent
:= Defining_Entity
(Unit
(Parent_Spec
(Lib_Unit
)));
3173 Set_Is_Private_Descendant
3174 (Defining_Entity
(Lib_Unit
),
3175 Is_Private_Descendant
(Lib_Parent
)
3176 or else Private_Present
(Parent
(Lib_Unit
)));
3179 Set_Is_Private_Descendant
3180 (Defining_Entity
(Lib_Unit
),
3181 Private_Present
(Parent
(Lib_Unit
)));
3185 if Check_Private
then
3186 Check_Private_Child_Unit
(N
);
3188 end Install_Context_Clauses
;
3190 -------------------------------------
3191 -- Install_Limited_Context_Clauses --
3192 -------------------------------------
3194 procedure Install_Limited_Context_Clauses
(N
: Node_Id
) is
3197 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
);
3198 -- Check that the unlimited view of a given compilation_unit is not
3199 -- already visible through "use + renamings".
3201 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
);
3202 -- Check that if a limited_with clause of a given compilation_unit
3203 -- mentions a descendant of a private child of some library unit,
3204 -- then the given compilation_unit shall be the declaration of a
3205 -- private descendant of that library unit, or a public descendant
3206 -- of such. The code is analogous to that of Check_Private_Child_Unit
3207 -- but we cannot use entities on the limited with_clauses because
3208 -- their units have not been analyzed, so we have to climb the tree
3209 -- of ancestors looking for private keywords.
3211 procedure Expand_Limited_With_Clause
3212 (Comp_Unit
: Node_Id
;
3215 -- If a child unit appears in a limited_with clause, there are implicit
3216 -- limited_with clauses on all parents that are not already visible
3217 -- through a regular with clause. This procedure creates the implicit
3218 -- limited with_clauses for the parents and loads the corresponding
3219 -- units. The shadow entities are created when the inserted clause is
3220 -- analyzed. Implements Ada 2005 (AI-50217).
3222 ---------------------
3223 -- Check_Renamings --
3224 ---------------------
3226 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
) is
3235 pragma Assert
(Nkind
(W
) = N_With_Clause
);
3237 -- Protect the frontend against previous critical errors
3239 case Nkind
(Unit
(Library_Unit
(W
))) is
3240 when N_Subprogram_Declaration |
3241 N_Package_Declaration |
3242 N_Generic_Subprogram_Declaration |
3243 N_Generic_Package_Declaration
=>
3250 -- Check "use + renamings"
3252 WEnt
:= Defining_Unit_Name
(Specification
(Unit
(Library_Unit
(W
))));
3253 Spec
:= Specification
(Unit
(P
));
3255 Item
:= First
(Visible_Declarations
(Spec
));
3256 while Present
(Item
) loop
3258 -- Look only at use package clauses
3260 if Nkind
(Item
) = N_Use_Package_Clause
then
3262 -- Traverse the list of packages
3264 Nam
:= First
(Names
(Item
));
3265 while Present
(Nam
) loop
3268 pragma Assert
(Present
(Parent
(E
)));
3270 if Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
3271 and then Renamed_Entity
(E
) = WEnt
3273 -- The unlimited view is visible through use clause and
3274 -- renamings. There is not need to generate the error
3275 -- message here because Is_Visible_Through_Renamings
3276 -- takes care of generating the precise error message.
3280 elsif Nkind
(Parent
(E
)) = N_Package_Specification
then
3282 -- The use clause may refer to a local package.
3283 -- Check all the enclosing scopes.
3286 while E2
/= Standard_Standard
3294 ("unlimited view visible through use clause ", W
);
3306 -- Recursive call to check all the ancestors
3308 if Is_Child_Spec
(Unit
(P
)) then
3309 Check_Renamings
(P
=> Parent_Spec
(Unit
(P
)), W
=> W
);
3311 end Check_Renamings
;
3313 ---------------------------------------
3314 -- Check_Private_Limited_Withed_Unit --
3315 ---------------------------------------
3317 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
) is
3318 Curr_Parent
: Node_Id
;
3319 Child_Parent
: Node_Id
;
3320 Curr_Private
: Boolean;
3323 -- Compilation unit of the parent of the withed library unit
3325 Child_Parent
:= Library_Unit
(Item
);
3327 -- If the child unit is a public child, then locate its nearest
3328 -- private ancestor, if any; Child_Parent will then be set to
3329 -- the parent of that ancestor.
3331 if not Private_Present
(Library_Unit
(Item
)) then
3332 while Present
(Child_Parent
)
3333 and then not Private_Present
(Child_Parent
)
3335 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3338 if No
(Child_Parent
) then
3343 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3345 -- Traverse all the ancestors of the current compilation
3346 -- unit to check if it is a descendant of named library unit.
3348 Curr_Parent
:= Parent
(Item
);
3349 Curr_Private
:= Private_Present
(Curr_Parent
);
3351 while Present
(Parent_Spec
(Unit
(Curr_Parent
)))
3352 and then Curr_Parent
/= Child_Parent
3354 Curr_Parent
:= Parent_Spec
(Unit
(Curr_Parent
));
3355 Curr_Private
:= Curr_Private
or else Private_Present
(Curr_Parent
);
3358 if Curr_Parent
/= Child_Parent
then
3360 ("unit in with clause is private child unit!", Item
);
3362 ("\current unit must also have parent&!",
3363 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3365 elsif Private_Present
(Parent
(Item
))
3366 or else Curr_Private
3367 or else Private_Present
(Item
)
3368 or else Nkind_In
(Unit
(Parent
(Item
)), N_Package_Body
,
3372 -- Current unit is private, of descendant of a private unit.
3378 ("current unit must also be private descendant of&",
3379 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3381 end Check_Private_Limited_Withed_Unit
;
3383 --------------------------------
3384 -- Expand_Limited_With_Clause --
3385 --------------------------------
3387 procedure Expand_Limited_With_Clause
3388 (Comp_Unit
: Node_Id
;
3392 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
3393 Unum
: Unit_Number_Type
;
3396 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean;
3397 -- Returns true if the context already includes a with_clause for
3398 -- this unit. If the with_clause is non-limited, the unit is fully
3399 -- visible and an implicit limited_with should not be created. If
3400 -- there is already a limited_with clause for W, a second one is
3401 -- simply redundant.
3403 --------------------------
3404 -- Previous_Withed_Unit --
3405 --------------------------
3407 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean is
3411 -- A limited with_clause cannot appear in the same context_clause
3412 -- as a nonlimited with_clause which mentions the same library.
3414 Item
:= First
(Context_Items
(Comp_Unit
));
3415 while Present
(Item
) loop
3416 if Nkind
(Item
) = N_With_Clause
3417 and then Library_Unit
(Item
) = Library_Unit
(W
)
3426 end Previous_Withed_Unit
;
3428 -- Start of processing for Expand_Limited_With_Clause
3431 New_Nodes_OK
:= New_Nodes_OK
+ 1;
3433 if Nkind
(Nam
) = N_Identifier
then
3435 -- Create node for name of withed unit
3438 Make_With_Clause
(Loc
,
3439 Name
=> New_Copy
(Nam
));
3441 else pragma Assert
(Nkind
(Nam
) = N_Selected_Component
);
3443 Make_With_Clause
(Loc
,
3444 Name
=> Make_Selected_Component
(Loc
,
3445 Prefix
=> New_Copy_Tree
(Prefix
(Nam
)),
3446 Selector_Name
=> New_Copy
(Selector_Name
(Nam
))));
3447 Set_Parent
(Withn
, Parent
(N
));
3450 Set_Limited_Present
(Withn
);
3451 Set_First_Name
(Withn
);
3452 Set_Implicit_With
(Withn
);
3456 (Load_Name
=> Get_Spec_Name
(Get_Unit_Name
(Nam
)),
3461 -- Do not generate a limited_with_clause on the current unit.
3462 -- This path is taken when a unit has a limited_with clause on
3463 -- one of its child units.
3465 if Unum
= Current_Sem_Unit
then
3469 Set_Library_Unit
(Withn
, Cunit
(Unum
));
3470 Set_Corresponding_Spec
3471 (Withn
, Specification
(Unit
(Cunit
(Unum
))));
3473 if not Previous_Withed_Unit
(Withn
) then
3474 Prepend
(Withn
, Context_Items
(Parent
(N
)));
3475 Mark_Rewrite_Insertion
(Withn
);
3477 -- Add implicit limited_with_clauses for parents of child units
3478 -- mentioned in limited_with clauses.
3480 if Nkind
(Nam
) = N_Selected_Component
then
3481 Expand_Limited_With_Clause
(Comp_Unit
, Prefix
(Nam
), N
);
3486 if not Limited_View_Installed
(Withn
) then
3487 Install_Limited_Withed_Unit
(Withn
);
3491 New_Nodes_OK
:= New_Nodes_OK
- 1;
3492 end Expand_Limited_With_Clause
;
3494 -- Start of processing for Install_Limited_Context_Clauses
3497 Item
:= First
(Context_Items
(N
));
3498 while Present
(Item
) loop
3499 if Nkind
(Item
) = N_With_Clause
3500 and then Limited_Present
(Item
)
3502 if Nkind
(Name
(Item
)) = N_Selected_Component
then
3503 Expand_Limited_With_Clause
3504 (Comp_Unit
=> N
, Nam
=> Prefix
(Name
(Item
)), N
=> Item
);
3507 Check_Private_Limited_Withed_Unit
(Item
);
3509 if not Implicit_With
(Item
)
3510 and then Is_Child_Spec
(Unit
(N
))
3512 Check_Renamings
(Parent_Spec
(Unit
(N
)), Item
);
3515 -- A unit may have a limited with on itself if it has a limited
3516 -- with_clause on one of its child units. In that case it is
3517 -- already being compiled and it makes no sense to install its
3520 -- If the item is a limited_private_with_clause, install it if the
3521 -- current unit is a body or if it is a private child. Otherwise
3522 -- the private clause is installed before analyzing the private
3523 -- part of the current unit.
3525 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
)
3526 and then not Limited_View_Installed
(Item
)
3528 if not Private_Present
(Item
)
3529 or else Private_Present
(N
)
3530 or else Nkind_In
(Unit
(N
), N_Package_Body
,
3534 Install_Limited_Withed_Unit
(Item
);
3538 -- All items other than Limited_With clauses are ignored (they were
3539 -- installed separately early on by Install_Context_Clause).
3548 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3549 -- spec, looking for incomplete subtype declarations of incomplete
3550 -- types visible through a limited with clause.
3552 if Ada_Version
>= Ada_05
3553 and then Analyzed
(N
)
3554 and then Nkind
(Unit
(N
)) = N_Package_Declaration
3559 Non_Lim_View
: Entity_Id
;
3562 Decl
:= First
(Visible_Declarations
(Specification
(Unit
(N
))));
3563 while Present
(Decl
) loop
3564 if Nkind
(Decl
) = N_Subtype_Declaration
3566 Ekind
(Defining_Identifier
(Decl
)) = E_Incomplete_Subtype
3568 From_With_Type
(Defining_Identifier
(Decl
))
3570 Def_Id
:= Defining_Identifier
(Decl
);
3571 Non_Lim_View
:= Non_Limited_View
(Def_Id
);
3573 if not Is_Incomplete_Type
(Non_Lim_View
) then
3575 -- Convert an incomplete subtype declaration into a
3576 -- corresponding non-limited view subtype declaration.
3577 -- This is usually the case when analyzing a body that
3578 -- has regular with-clauses, when the spec has limited
3581 -- If the non-limited view is still incomplete, it is
3582 -- the dummy entry already created, and the declaration
3583 -- cannot be reanalyzed. This is the case when installing
3584 -- a parent unit that has limited with-clauses.
3586 Set_Subtype_Indication
(Decl
,
3587 New_Reference_To
(Non_Lim_View
, Sloc
(Def_Id
)));
3588 Set_Etype
(Def_Id
, Non_Lim_View
);
3589 Set_Ekind
(Def_Id
, Subtype_Kind
(Ekind
(Non_Lim_View
)));
3590 Set_Analyzed
(Decl
, False);
3592 -- Reanalyze the declaration, suppressing the call to
3593 -- Enter_Name to avoid duplicate names.
3595 Analyze_Subtype_Declaration
3605 end Install_Limited_Context_Clauses
;
3607 ---------------------
3608 -- Install_Parents --
3609 ---------------------
3611 procedure Install_Parents
(Lib_Unit
: Node_Id
; Is_Private
: Boolean) is
3618 P
:= Unit
(Parent_Spec
(Lib_Unit
));
3619 P_Name
:= Get_Parent_Entity
(P
);
3621 if Etype
(P_Name
) = Any_Type
then
3625 if Ekind
(P_Name
) = E_Generic_Package
3626 and then not Nkind_In
(Lib_Unit
, N_Generic_Subprogram_Declaration
,
3627 N_Generic_Package_Declaration
)
3628 and then Nkind
(Lib_Unit
) not in N_Generic_Renaming_Declaration
3631 ("child of a generic package must be a generic unit", Lib_Unit
);
3633 elsif not Is_Package_Or_Generic_Package
(P_Name
) then
3635 ("parent unit must be package or generic package", Lib_Unit
);
3636 raise Unrecoverable_Error
;
3638 elsif Present
(Renamed_Object
(P_Name
)) then
3639 Error_Msg_N
("parent unit cannot be a renaming", Lib_Unit
);
3640 raise Unrecoverable_Error
;
3642 -- Verify that a child of an instance is itself an instance, or the
3643 -- renaming of one. Given that an instance that is a unit is replaced
3644 -- with a package declaration, check against the original node. The
3645 -- parent may be currently being instantiated, in which case it appears
3646 -- as a declaration, but the generic_parent is already established
3647 -- indicating that we deal with an instance.
3649 elsif Nkind
(Original_Node
(P
)) = N_Package_Instantiation
then
3650 if Nkind
(Lib_Unit
) in N_Renaming_Declaration
3651 or else Nkind
(Original_Node
(Lib_Unit
)) in N_Generic_Instantiation
3653 (Nkind
(Lib_Unit
) = N_Package_Declaration
3654 and then Present
(Generic_Parent
(Specification
(Lib_Unit
))))
3659 ("child of an instance must be an instance or renaming",
3664 -- This is the recursive call that ensures all parents are loaded
3666 if Is_Child_Spec
(P
) then
3668 Is_Private
or else Private_Present
(Parent
(Lib_Unit
)));
3671 -- Now we can install the context for this parent
3673 Install_Context_Clauses
(Parent_Spec
(Lib_Unit
));
3674 Install_Limited_Context_Clauses
(Parent_Spec
(Lib_Unit
));
3675 Install_Siblings
(P_Name
, Parent
(Lib_Unit
));
3677 -- The child unit is in the declarative region of the parent. The parent
3678 -- must therefore appear in the scope stack and be visible, as when
3679 -- compiling the corresponding body. If the child unit is private or it
3680 -- is a package body, private declarations must be accessible as well.
3681 -- Use declarations in the parent must also be installed. Finally, other
3682 -- child units of the same parent that are in the context are
3683 -- immediately visible.
3685 -- Find entity for compilation unit, and set its private descendant
3686 -- status as needed.
3688 E_Name
:= Defining_Entity
(Lib_Unit
);
3690 Set_Is_Child_Unit
(E_Name
);
3692 Set_Is_Private_Descendant
(E_Name
,
3693 Is_Private_Descendant
(P_Name
)
3694 or else Private_Present
(Parent
(Lib_Unit
)));
3696 P_Spec
:= Specification
(Unit_Declaration_Node
(P_Name
));
3697 Push_Scope
(P_Name
);
3699 -- Save current visibility of unit
3701 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
:=
3702 Is_Immediately_Visible
(P_Name
);
3703 Set_Is_Immediately_Visible
(P_Name
);
3704 Install_Visible_Declarations
(P_Name
);
3705 Set_Use
(Visible_Declarations
(P_Spec
));
3707 -- If the parent is a generic unit, its formal part may contain formal
3708 -- packages and use clauses for them.
3710 if Ekind
(P_Name
) = E_Generic_Package
then
3711 Set_Use
(Generic_Formal_Declarations
(Parent
(P_Spec
)));
3715 or else Private_Present
(Parent
(Lib_Unit
))
3717 Install_Private_Declarations
(P_Name
);
3718 Install_Private_With_Clauses
(P_Name
);
3719 Set_Use
(Private_Declarations
(P_Spec
));
3721 end Install_Parents
;
3723 ----------------------------------
3724 -- Install_Private_With_Clauses --
3725 ----------------------------------
3727 procedure Install_Private_With_Clauses
(P
: Entity_Id
) is
3728 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
3732 if Debug_Flag_I
then
3733 Write_Str
("install private with clauses of ");
3734 Write_Name
(Chars
(P
));
3738 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
3739 Item
:= First
(Context_Items
(Parent
(Decl
)));
3740 while Present
(Item
) loop
3741 if Nkind
(Item
) = N_With_Clause
3742 and then Private_Present
(Item
)
3744 if Limited_Present
(Item
) then
3745 if not Limited_View_Installed
(Item
) then
3746 Install_Limited_Withed_Unit
(Item
);
3749 Install_Withed_Unit
(Item
, Private_With_OK
=> True);
3756 end Install_Private_With_Clauses
;
3758 ----------------------
3759 -- Install_Siblings --
3760 ----------------------
3762 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
) is
3768 -- Iterate over explicit with clauses, and check whether the scope of
3769 -- each entity is an ancestor of the current unit, in which case it is
3770 -- immediately visible.
3772 Item
:= First
(Context_Items
(N
));
3773 while Present
(Item
) loop
3775 -- Do not install private_with_clauses declaration, unless
3776 -- unit is itself a private child unit, or is a body.
3777 -- Note that for a subprogram body the private_with_clause does
3778 -- not take effect until after the specification.
3780 if Nkind
(Item
) /= N_With_Clause
3781 or else Implicit_With
(Item
)
3782 or else Limited_Present
(Item
)
3786 elsif not Private_Present
(Item
)
3787 or else Private_Present
(N
)
3788 or else Nkind
(Unit
(N
)) = N_Package_Body
3790 Id
:= Entity
(Name
(Item
));
3792 if Is_Child_Unit
(Id
)
3793 and then Is_Ancestor_Package
(Scope
(Id
), U_Name
)
3795 Set_Is_Immediately_Visible
(Id
);
3797 -- Check for the presence of another unit in the context,
3798 -- that may be inadvertently hidden by the child.
3800 Prev
:= Current_Entity
(Id
);
3803 and then Is_Immediately_Visible
(Prev
)
3804 and then not Is_Child_Unit
(Prev
)
3810 Clause
:= First
(Context_Items
(N
));
3811 while Present
(Clause
) loop
3812 if Nkind
(Clause
) = N_With_Clause
3813 and then Entity
(Name
(Clause
)) = Prev
3816 ("child unit& hides compilation unit " &
3817 "with the same name?",
3827 -- The With_Clause may be on a grand-child or one of its further
3828 -- descendants, which makes a child immediately visible. Examine
3829 -- ancestry to determine whether such a child exists. For example,
3830 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
3831 -- is immediately visible.
3833 elsif Is_Child_Unit
(Id
) then
3839 while Is_Child_Unit
(Par
) loop
3840 if Is_Ancestor_Package
(Scope
(Par
), U_Name
) then
3841 Set_Is_Immediately_Visible
(Par
);
3850 -- If the item is a private with-clause on a child unit, the parent
3851 -- may have been installed already, but the child unit must remain
3852 -- invisible until installed in a private part or body.
3854 elsif Private_Present
(Item
) then
3855 Id
:= Entity
(Name
(Item
));
3857 if Is_Child_Unit
(Id
) then
3858 Set_Is_Visible_Child_Unit
(Id
, False);
3864 end Install_Siblings
;
3866 ---------------------------------
3867 -- Install_Limited_Withed_Unit --
3868 ---------------------------------
3870 procedure Install_Limited_Withed_Unit
(N
: Node_Id
) is
3871 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
3874 Is_Child_Package
: Boolean := False;
3875 Lim_Header
: Entity_Id
;
3876 Lim_Typ
: Entity_Id
;
3878 procedure Check_Body_Required
;
3879 -- A unit mentioned in a limited with_clause may not be mentioned in
3880 -- a regular with_clause, but must still be included in the current
3881 -- partition. We need to determine whether the unit needs a body, so
3882 -- that the binder can determine the name of the file to be compiled.
3883 -- Checking whether a unit needs a body can be done without semantic
3884 -- analysis, by examining the nature of the declarations in the package.
3886 function Has_Limited_With_Clause
3887 (C_Unit
: Entity_Id
;
3888 Pack
: Entity_Id
) return Boolean;
3889 -- Determine whether any package in the ancestor chain starting with
3890 -- C_Unit has a limited with clause for package Pack.
3892 function Has_With_Clause
3895 Is_Limited
: Boolean := False) return Boolean;
3896 -- Determine whether compilation unit C_Unit contains a with clause
3897 -- for package Pack. Use flag Is_Limited to designate desired clause
3898 -- kind. This is a subsidiary routine to Has_Limited_With_Clause.
3900 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean;
3901 -- Check if some package installed though normal with-clauses has a
3902 -- renaming declaration of package P. AARM 10.1.2(21/2).
3904 -------------------------
3905 -- Check_Body_Required --
3906 -------------------------
3908 -- ??? misses pragma Import on subprograms
3909 -- ??? misses pragma Import on renamed subprograms
3911 procedure Check_Body_Required
is
3912 PA
: constant List_Id
:=
3913 Pragmas_After
(Aux_Decls_Node
(Parent
(P_Unit
)));
3915 procedure Check_Declarations
(Spec
: Node_Id
);
3916 -- Recursive procedure that does the work and checks nested packages
3918 ------------------------
3919 -- Check_Declarations --
3920 ------------------------
3922 procedure Check_Declarations
(Spec
: Node_Id
) is
3924 Incomplete_Decls
: constant Elist_Id
:= New_Elmt_List
;
3927 -- Search for Elaborate Body pragma
3929 Decl
:= First
(Visible_Declarations
(Spec
));
3930 while Present
(Decl
)
3931 and then Nkind
(Decl
) = N_Pragma
3933 if Get_Pragma_Id
(Decl
) = Pragma_Elaborate_Body
then
3934 Set_Body_Required
(Library_Unit
(N
));
3941 -- Look for declarations that require the presence of a body
3943 while Present
(Decl
) loop
3945 -- Subprogram that comes from source means body required
3946 -- This is where a test for Import is missing ???
3948 if Comes_From_Source
(Decl
)
3949 and then (Nkind_In
(Decl
, N_Subprogram_Declaration
,
3950 N_Generic_Subprogram_Declaration
))
3952 Set_Body_Required
(Library_Unit
(N
));
3955 -- Package declaration of generic package declaration. We need
3956 -- to recursively examine nested declarations.
3958 elsif Nkind_In
(Decl
, N_Package_Declaration
,
3959 N_Generic_Package_Declaration
)
3961 Check_Declarations
(Specification
(Decl
));
3967 -- Same set of tests for private part. In addition to subprograms
3968 -- detect the presence of Taft Amendment types (incomplete types
3969 -- completed in the body).
3971 Decl
:= First
(Private_Declarations
(Spec
));
3972 while Present
(Decl
) loop
3973 if Comes_From_Source
(Decl
)
3974 and then (Nkind_In
(Decl
, N_Subprogram_Declaration
,
3975 N_Generic_Subprogram_Declaration
))
3977 Set_Body_Required
(Library_Unit
(N
));
3979 elsif Nkind_In
(Decl
, N_Package_Declaration
,
3980 N_Generic_Package_Declaration
)
3982 Check_Declarations
(Specification
(Decl
));
3984 -- Collect incomplete type declarations for separate pass
3986 elsif Nkind
(Decl
) = N_Incomplete_Type_Declaration
then
3987 Append_Elmt
(Decl
, Incomplete_Decls
);
3993 -- Now check incomplete declarations to locate Taft amendment
3994 -- types. This can be done by examining the defining identifiers
3995 -- of type declarations without real semantic analysis.
4001 Inc
:= First_Elmt
(Incomplete_Decls
);
4002 while Present
(Inc
) loop
4003 Decl
:= Next
(Node
(Inc
));
4004 while Present
(Decl
) loop
4005 if Nkind
(Decl
) = N_Full_Type_Declaration
4006 and then Chars
(Defining_Identifier
(Decl
)) =
4007 Chars
(Defining_Identifier
(Node
(Inc
)))
4015 -- If no completion, this is a TAT, and a body is needed
4018 Set_Body_Required
(Library_Unit
(N
));
4025 end Check_Declarations
;
4027 -- Start of processing for Check_Body_Required
4030 -- If this is an imported package (Java and CIL usage) no body is
4031 -- needed. Scan list of pragmas that may follow a compilation unit
4032 -- to look for a relevant pragma Import.
4034 if Present
(PA
) then
4040 while Present
(Prag
) loop
4041 if Nkind
(Prag
) = N_Pragma
4042 and then Get_Pragma_Id
(Prag
) = Pragma_Import
4052 Check_Declarations
(Specification
(P_Unit
));
4053 end Check_Body_Required
;
4055 -----------------------------
4056 -- Has_Limited_With_Clause --
4057 -----------------------------
4059 function Has_Limited_With_Clause
4060 (C_Unit
: Entity_Id
;
4061 Pack
: Entity_Id
) return Boolean
4068 while Present
(Par
) loop
4069 if Ekind
(Par
) /= E_Package
then
4073 -- Retrieve the Compilation_Unit node for Par and determine if
4074 -- its context clauses contain a limited with for Pack.
4076 Par_Unit
:= Parent
(Parent
(Parent
(Par
)));
4078 if Nkind
(Par_Unit
) = N_Package_Declaration
then
4079 Par_Unit
:= Parent
(Par_Unit
);
4082 if Has_With_Clause
(Par_Unit
, Pack
, True) then
4086 -- If there are more ancestors, climb up the tree, otherwise
4089 if Is_Child_Unit
(Par
) then
4097 end Has_Limited_With_Clause
;
4099 ---------------------
4100 -- Has_With_Clause --
4101 ---------------------
4103 function Has_With_Clause
4106 Is_Limited
: Boolean := False) return Boolean
4112 if Present
(Context_Items
(C_Unit
)) then
4113 Item
:= First
(Context_Items
(C_Unit
));
4114 while Present
(Item
) loop
4115 if Nkind
(Item
) = N_With_Clause
then
4117 -- Retrieve the entity of the imported compilation unit
4119 if Nkind
(Name
(Item
)) = N_Selected_Component
then
4120 Nam
:= Entity
(Selector_Name
(Name
(Item
)));
4122 Nam
:= Entity
(Name
(Item
));
4127 ((Is_Limited
and then Limited_Present
(Item
))
4129 (not Is_Limited
and then not Limited_Present
(Item
)))
4140 end Has_With_Clause
;
4142 ----------------------------------
4143 -- Is_Visible_Through_Renamings --
4144 ----------------------------------
4146 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean is
4147 Kind
: constant Node_Kind
:=
4148 Nkind
(Unit
(Cunit
(Current_Sem_Unit
)));
4154 -- Example of the error detected by this subprogram:
4162 -- package Ren_P renames P;
4168 -- limited with P; -- ERROR
4169 -- package R.C is ...
4171 Aux_Unit
:= Cunit
(Current_Sem_Unit
);
4174 Item
:= First
(Context_Items
(Aux_Unit
));
4175 while Present
(Item
) loop
4176 if Nkind
(Item
) = N_With_Clause
4177 and then not Limited_Present
(Item
)
4178 and then Nkind
(Unit
(Library_Unit
(Item
))) =
4179 N_Package_Declaration
4182 First
(Visible_Declarations
4183 (Specification
(Unit
(Library_Unit
(Item
)))));
4184 while Present
(Decl
) loop
4185 if Nkind
(Decl
) = N_Package_Renaming_Declaration
4186 and then Entity
(Name
(Decl
)) = P
4188 -- Generate the error message only if the current unit
4189 -- is a package declaration; in case of subprogram
4190 -- bodies and package bodies we just return true to
4191 -- indicate that the limited view must not be
4194 if Kind
= N_Package_Declaration
then
4196 ("simultaneous visibility of the limited and " &
4197 "unlimited views not allowed", N
);
4198 Error_Msg_Sloc
:= Sloc
(Item
);
4200 ("\\ unlimited view of & visible through the " &
4201 "context clause #", N
, P
);
4202 Error_Msg_Sloc
:= Sloc
(Decl
);
4203 Error_Msg_NE
("\\ and the renaming #", N
, P
);
4216 if Present
(Library_Unit
(Aux_Unit
)) then
4217 if Aux_Unit
= Library_Unit
(Aux_Unit
) then
4219 -- Aux_Unit is a body that acts as a spec. Clause has
4220 -- already been flagged as illegal.
4225 Aux_Unit
:= Library_Unit
(Aux_Unit
);
4228 Aux_Unit
:= Parent_Spec
(Unit
(Aux_Unit
));
4231 exit when No
(Aux_Unit
);
4235 end Is_Visible_Through_Renamings
;
4237 -- Start of processing for Install_Limited_Withed_Unit
4240 pragma Assert
(not Limited_View_Installed
(N
));
4242 -- In case of limited with_clause on subprograms, generics, instances,
4243 -- or renamings, the corresponding error was previously posted and we
4244 -- have nothing to do here. If the file is missing altogether, it has
4245 -- no source location.
4247 if Nkind
(P_Unit
) /= N_Package_Declaration
4248 or else Sloc
(P_Unit
) = No_Location
4253 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
4255 -- Handle child packages
4257 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
4258 Is_Child_Package
:= True;
4259 P
:= Defining_Identifier
(P
);
4262 -- Do not install the limited-view if the full-view is already visible
4263 -- through renaming declarations.
4265 if Is_Visible_Through_Renamings
(P
) then
4269 -- Do not install the limited view if this is the unit being analyzed.
4270 -- This unusual case will happen when a unit has a limited_with clause
4271 -- on one of its children. The compilation of the child forces the
4272 -- load of the parent which tries to install the limited view of the
4273 -- child again. Installing the limited view must also be disabled
4274 -- when compiling the body of the child unit.
4276 if P
= Cunit_Entity
(Current_Sem_Unit
)
4278 (Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4279 and then P
= Main_Unit_Entity
)
4284 -- This scenario is similar to the one above, the difference is that
4285 -- the compilation of sibling Par.Sib forces the load of parent Par
4286 -- which tries to install the limited view of Lim_Pack [1]. However
4287 -- Par.Sib has a with clause for Lim_Pack [2] in its body, and thus
4288 -- needs the non-limited views of all entities from Lim_Pack.
4290 -- limited with Lim_Pack; -- [1]
4291 -- package Par is ... package Lim_Pack is ...
4293 -- with Lim_Pack; -- [2]
4294 -- package Par.Sib is ... package body Par.Sib is ...
4296 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4297 -- Sem_Unit is the body of Par.Sib.
4299 if Ekind
(P
) = E_Package
4300 and then Ekind
(Main_Unit_Entity
) = E_Package
4301 and then Is_Child_Unit
(Main_Unit_Entity
)
4303 -- The body has a regular with clause
4305 and then Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4306 and then Has_With_Clause
(Cunit
(Current_Sem_Unit
), P
)
4308 -- One of the ancestors has a limited with clause
4310 and then Nkind
(Parent
(Parent
(Main_Unit_Entity
))) =
4311 N_Package_Specification
4312 and then Has_Limited_With_Clause
(Scope
(Main_Unit_Entity
), P
)
4317 -- A common use of the limited-with is to have a limited-with
4318 -- in the package spec, and a normal with in its package body.
4321 -- limited with X; -- [1]
4325 -- package body A is ...
4327 -- The compilation of A's body installs the context clauses found at [2]
4328 -- and then the context clauses of its specification (found at [1]). As
4329 -- a consequence, at [1] the specification of X has been analyzed and it
4330 -- is immediately visible. According to the semantics of limited-with
4331 -- context clauses we don't install the limited view because the full
4332 -- view of X supersedes its limited view.
4334 if Analyzed
(P_Unit
)
4336 (Is_Immediately_Visible
(P
)
4338 (Is_Child_Package
and then Is_Visible_Child_Unit
(P
)))
4343 if Debug_Flag_I
then
4344 Write_Str
("install limited view of ");
4345 Write_Name
(Chars
(P
));
4349 -- If the unit has not been analyzed and the limited view has not been
4350 -- already installed then we install it.
4352 if not Analyzed
(P_Unit
) then
4353 if not In_Chain
(P
) then
4355 -- Minimum decoration
4357 Set_Ekind
(P
, E_Package
);
4358 Set_Etype
(P
, Standard_Void_Type
);
4359 Set_Scope
(P
, Standard_Standard
);
4361 if Is_Child_Package
then
4362 Set_Is_Child_Unit
(P
);
4363 Set_Is_Visible_Child_Unit
(P
);
4364 Set_Scope
(P
, Defining_Entity
(Unit
(Parent_Spec
(P_Unit
))));
4367 -- Place entity on visibility structure
4369 Set_Homonym
(P
, Current_Entity
(P
));
4370 Set_Current_Entity
(P
);
4372 if Debug_Flag_I
then
4373 Write_Str
(" (homonym) chain ");
4374 Write_Name
(Chars
(P
));
4378 -- Install the incomplete view. The first element of the limited
4379 -- view is a header (an E_Package entity) used to reference the
4380 -- first shadow entity in the private part of the package.
4382 Lim_Header
:= Limited_View
(P
);
4383 Lim_Typ
:= First_Entity
(Lim_Header
);
4385 while Present
(Lim_Typ
)
4386 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
4388 Set_Homonym
(Lim_Typ
, Current_Entity
(Lim_Typ
));
4389 Set_Current_Entity
(Lim_Typ
);
4391 if Debug_Flag_I
then
4392 Write_Str
(" (homonym) chain ");
4393 Write_Name
(Chars
(Lim_Typ
));
4397 Next_Entity
(Lim_Typ
);
4401 -- If the unit appears in a previous regular with_clause, the regular
4402 -- entities of the public part of the withed package must be replaced
4403 -- by the shadow ones.
4405 -- This code must be kept synchronized with the code that replaces the
4406 -- shadow entities by the real entities (see body of Remove_Limited
4407 -- With_Clause); otherwise the contents of the homonym chains are not
4411 -- Hide all the type entities of the public part of the package to
4412 -- avoid its usage. This is needed to cover all the subtype decla-
4413 -- rations because we do not remove them from the homonym chain.
4415 E
:= First_Entity
(P
);
4416 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
4418 Set_Was_Hidden
(E
, Is_Hidden
(E
));
4425 -- Replace the real entities by the shadow entities of the limited
4426 -- view. The first element of the limited view is a header that is
4427 -- used to reference the first shadow entity in the private part
4428 -- of the package. Successive elements are the limited views of the
4429 -- type (including regular incomplete types) declared in the package.
4431 Lim_Header
:= Limited_View
(P
);
4433 Lim_Typ
:= First_Entity
(Lim_Header
);
4434 while Present
(Lim_Typ
)
4435 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
4437 pragma Assert
(not In_Chain
(Lim_Typ
));
4439 -- Do not unchain nested packages and child units
4441 if Ekind
(Lim_Typ
) /= E_Package
4442 and then not Is_Child_Unit
(Lim_Typ
)
4448 Prev
:= Current_Entity
(Lim_Typ
);
4451 -- Replace E in the homonyms list, so that the limited
4452 -- view becomes available.
4454 if E
= Non_Limited_View
(Lim_Typ
) then
4455 Set_Homonym
(Lim_Typ
, Homonym
(Prev
));
4456 Set_Current_Entity
(Lim_Typ
);
4460 E
:= Homonym
(Prev
);
4462 -- E may have been removed when installing a
4463 -- previous limited_with_clause.
4467 exit when E
= Non_Limited_View
(Lim_Typ
);
4469 Prev
:= Homonym
(Prev
);
4473 Set_Homonym
(Lim_Typ
, Homonym
(Homonym
(Prev
)));
4474 Set_Homonym
(Prev
, Lim_Typ
);
4479 if Debug_Flag_I
then
4480 Write_Str
(" (homonym) chain ");
4481 Write_Name
(Chars
(Lim_Typ
));
4486 Next_Entity
(Lim_Typ
);
4490 -- The package must be visible while the limited-with clause is active
4491 -- because references to the type P.T must resolve in the usual way.
4492 -- In addition, we remember that the limited-view has been installed to
4493 -- uninstall it at the point of context removal.
4495 Set_Is_Immediately_Visible
(P
);
4496 Set_Limited_View_Installed
(N
);
4498 -- If unit has not been analyzed in some previous context, check
4499 -- (imperfectly ???) whether it might need a body.
4501 if not Analyzed
(P_Unit
) then
4502 Check_Body_Required
;
4505 -- If the package in the limited_with clause is a child unit, the
4506 -- clause is unanalyzed and appears as a selected component. Recast
4507 -- it as an expanded name so that the entity can be properly set. Use
4508 -- entity of parent, if available, for higher ancestors in the name.
4510 if Nkind
(Name
(N
)) = N_Selected_Component
then
4518 while Nkind
(Nam
) = N_Selected_Component
4519 and then Present
(Ent
)
4521 Change_Selected_Component_To_Expanded_Name
(Nam
);
4523 -- Set entity of parent identifiers if the unit is a child
4524 -- unit. This ensures that the tree is properly formed from
4525 -- semantic point of view (e.g. for ASIS queries).
4527 Set_Entity
(Nam
, Ent
);
4529 Nam
:= Prefix
(Nam
);
4532 -- Set entity of last ancestor
4534 if Nkind
(Nam
) = N_Identifier
then
4535 Set_Entity
(Nam
, Ent
);
4541 Set_Entity
(Name
(N
), P
);
4542 Set_From_With_Type
(P
);
4543 end Install_Limited_Withed_Unit
;
4545 -------------------------
4546 -- Install_Withed_Unit --
4547 -------------------------
4549 procedure Install_Withed_Unit
4550 (With_Clause
: Node_Id
;
4551 Private_With_OK
: Boolean := False)
4553 Uname
: constant Entity_Id
:= Entity
(Name
(With_Clause
));
4554 P
: constant Entity_Id
:= Scope
(Uname
);
4557 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4558 -- compiling a package declaration and the Private_With_OK flag was not
4559 -- set by the caller. These declarations will be installed later (before
4560 -- analyzing the private part of the package).
4562 if Private_Present
(With_Clause
)
4563 and then Nkind
(Unit
(Parent
(With_Clause
))) = N_Package_Declaration
4564 and then not (Private_With_OK
)
4569 if Debug_Flag_I
then
4570 if Private_Present
(With_Clause
) then
4571 Write_Str
("install private withed unit ");
4573 Write_Str
("install withed unit ");
4576 Write_Name
(Chars
(Uname
));
4580 -- We do not apply the restrictions to an internal unit unless
4581 -- we are compiling the internal unit as a main unit. This check
4582 -- is also skipped for dummy units (for missing packages).
4584 if Sloc
(Uname
) /= No_Location
4585 and then (not Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
))
4586 or else Current_Sem_Unit
= Main_Unit
)
4588 Check_Restricted_Unit
4589 (Unit_Name
(Get_Source_Unit
(Uname
)), With_Clause
);
4592 if P
/= Standard_Standard
then
4594 -- If the unit is not analyzed after analysis of the with clause and
4595 -- it is an instantiation then it awaits a body and is the main unit.
4596 -- Its appearance in the context of some other unit indicates a
4597 -- circular dependency (DEC suite perversity).
4599 if not Analyzed
(Uname
)
4600 and then Nkind
(Parent
(Uname
)) = N_Package_Instantiation
4603 ("instantiation depends on itself", Name
(With_Clause
));
4605 elsif not Is_Visible_Child_Unit
(Uname
) then
4606 Set_Is_Visible_Child_Unit
(Uname
);
4608 -- If the child unit appears in the context of its parent, it is
4609 -- immediately visible.
4611 if In_Open_Scopes
(Scope
(Uname
)) then
4612 Set_Is_Immediately_Visible
(Uname
);
4615 if Is_Generic_Instance
(Uname
)
4616 and then Ekind
(Uname
) in Subprogram_Kind
4618 -- Set flag as well on the visible entity that denotes the
4619 -- instance, which renames the current one.
4621 Set_Is_Visible_Child_Unit
4623 (Defining_Entity
(Unit
(Library_Unit
(With_Clause
)))));
4626 -- The parent unit may have been installed already, and may have
4627 -- appeared in a use clause.
4629 if In_Use
(Scope
(Uname
)) then
4630 Set_Is_Potentially_Use_Visible
(Uname
);
4633 Set_Context_Installed
(With_Clause
);
4636 elsif not Is_Immediately_Visible
(Uname
) then
4637 if not Private_Present
(With_Clause
)
4638 or else Private_With_OK
4640 Set_Is_Immediately_Visible
(Uname
);
4643 Set_Context_Installed
(With_Clause
);
4646 -- A with-clause overrides a with-type clause: there are no restric-
4647 -- tions on the use of package entities.
4649 if Ekind
(Uname
) = E_Package
then
4650 Set_From_With_Type
(Uname
, False);
4653 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4654 -- unit if there is a visible homograph for it declared in the same
4655 -- declarative region. This pathological case can only arise when an
4656 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4657 -- G1 has a generic child also named G2, and the context includes with_
4658 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4659 -- of I1.G2 visible as well. If the child unit is named Standard, do
4660 -- not apply the check to the Standard package itself.
4662 if Is_Child_Unit
(Uname
)
4663 and then Is_Visible_Child_Unit
(Uname
)
4664 and then Ada_Version
>= Ada_05
4667 Decl1
: constant Node_Id
:= Unit_Declaration_Node
(P
);
4673 U2
:= Homonym
(Uname
);
4675 and then U2
/= Standard_Standard
4678 Decl2
:= Unit_Declaration_Node
(P2
);
4680 if Is_Child_Unit
(U2
)
4681 and then Is_Visible_Child_Unit
(U2
)
4683 if Is_Generic_Instance
(P
)
4684 and then Nkind
(Decl1
) = N_Package_Declaration
4685 and then Generic_Parent
(Specification
(Decl1
)) = P2
4687 Error_Msg_N
("illegal with_clause", With_Clause
);
4689 ("\child unit has visible homograph" &
4690 " (RM 8.3(26), 10.1.1(19))",
4694 elsif Is_Generic_Instance
(P2
)
4695 and then Nkind
(Decl2
) = N_Package_Declaration
4696 and then Generic_Parent
(Specification
(Decl2
)) = P
4698 -- With_clause for child unit of instance appears before
4699 -- in the context. We want to place the error message on
4700 -- it, not on the generic child unit itself.
4703 Prev_Clause
: Node_Id
;
4706 Prev_Clause
:= First
(List_Containing
(With_Clause
));
4707 while Entity
(Name
(Prev_Clause
)) /= U2
loop
4711 pragma Assert
(Present
(Prev_Clause
));
4712 Error_Msg_N
("illegal with_clause", Prev_Clause
);
4714 ("\child unit has visible homograph" &
4715 " (RM 8.3(26), 10.1.1(19))",
4726 end Install_Withed_Unit
;
4732 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean is
4733 K
: constant Node_Kind
:= Nkind
(Lib_Unit
);
4736 return (K
in N_Generic_Declaration
or else
4737 K
in N_Generic_Instantiation
or else
4738 K
in N_Generic_Renaming_Declaration
or else
4739 K
= N_Package_Declaration
or else
4740 K
= N_Package_Renaming_Declaration
or else
4741 K
= N_Subprogram_Declaration
or else
4742 K
= N_Subprogram_Renaming_Declaration
)
4743 and then Present
(Parent_Spec
(Lib_Unit
));
4746 -----------------------
4747 -- Load_Needed_Body --
4748 -----------------------
4750 -- N is a generic unit named in a with clause, or else it is a unit that
4751 -- contains a generic unit or an inlined function. In order to perform an
4752 -- instantiation, the body of the unit must be present. If the unit itself
4753 -- is generic, we assume that an instantiation follows, and load & analyze
4754 -- the body unconditionally. This forces analysis of the spec as well.
4756 -- If the unit is not generic, but contains a generic unit, it is loaded on
4757 -- demand, at the point of instantiation (see ch12).
4759 procedure Load_Needed_Body
(N
: Node_Id
; OK
: out Boolean) is
4760 Body_Name
: Unit_Name_Type
;
4761 Unum
: Unit_Number_Type
;
4763 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
4764 -- The loading and analysis is done with style checks off
4767 if not GNAT_Mode
then
4768 Style_Check
:= False;
4771 Body_Name
:= Get_Body_Name
(Get_Unit_Name
(Unit
(N
)));
4774 (Load_Name
=> Body_Name
,
4780 if Unum
= No_Unit
then
4784 Compiler_State
:= Analyzing
; -- reset after load
4786 if not Fatal_Error
(Unum
) or else Try_Semantics
then
4787 if Debug_Flag_L
then
4788 Write_Str
("*** Loaded generic body");
4792 Semantics
(Cunit
(Unum
));
4798 Style_Check
:= Save_Style_Check
;
4799 end Load_Needed_Body
;
4801 -------------------------
4802 -- Build_Limited_Views --
4803 -------------------------
4805 procedure Build_Limited_Views
(N
: Node_Id
) is
4806 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Library_Unit
(N
));
4807 P
: constant Entity_Id
:= Cunit_Entity
(Unum
);
4809 Spec
: Node_Id
; -- To denote a package specification
4810 Lim_Typ
: Entity_Id
; -- To denote shadow entities
4811 Comp_Typ
: Entity_Id
; -- To denote real entities
4813 Lim_Header
: Entity_Id
; -- Package entity
4814 Last_Lim_E
: Entity_Id
:= Empty
; -- Last limited entity built
4815 Last_Pub_Lim_E
: Entity_Id
; -- To set the first private entity
4817 procedure Decorate_Incomplete_Type
4820 -- Add attributes of an incomplete type to a shadow entity. The same
4821 -- attributes are placed on the real entity, so that gigi receives
4822 -- a consistent view.
4824 procedure Decorate_Package_Specification
(P
: Entity_Id
);
4825 -- Add attributes of a package entity to the entity in a package
4828 procedure Decorate_Tagged_Type
4832 -- Set basic attributes of tagged type T, including its class_wide type.
4833 -- The parameters Loc, Scope are used to decorate the class_wide type.
4835 procedure Build_Chain
4837 First_Decl
: Node_Id
);
4838 -- Construct list of shadow entities and attach it to entity of
4839 -- package that is mentioned in a limited_with clause.
4841 function New_Internal_Shadow_Entity
4842 (Kind
: Entity_Kind
;
4843 Sloc_Value
: Source_Ptr
;
4844 Id_Char
: Character) return Entity_Id
;
4845 -- Build a new internal entity and append it to the list of shadow
4846 -- entities available through the limited-header
4848 ------------------------------
4849 -- Decorate_Incomplete_Type --
4850 ------------------------------
4852 procedure Decorate_Incomplete_Type
4857 Set_Ekind
(E
, E_Incomplete_Type
);
4858 Set_Scope
(E
, Scop
);
4860 Set_Is_First_Subtype
(E
, True);
4861 Set_Stored_Constraint
(E
, No_Elist
);
4862 Set_Full_View
(E
, Empty
);
4863 Init_Size_Align
(E
);
4864 end Decorate_Incomplete_Type
;
4866 --------------------------
4867 -- Decorate_Tagged_Type --
4868 --------------------------
4870 procedure Decorate_Tagged_Type
4878 Decorate_Incomplete_Type
(T
, Scop
);
4879 Set_Is_Tagged_Type
(T
);
4881 -- Build corresponding class_wide type, if not previously done
4883 -- Note: The class-wide entity is shared by the limited-view
4884 -- and the full-view.
4886 if No
(Class_Wide_Type
(T
)) then
4887 CW
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('S'));
4889 -- Set parent to be the same as the parent of the tagged type.
4890 -- We need a parent field set, and it is supposed to point to
4891 -- the declaration of the type. The tagged type declaration
4892 -- essentially declares two separate types, the tagged type
4893 -- itself and the corresponding class-wide type, so it is
4894 -- reasonable for the parent fields to point to the declaration
4897 Set_Parent
(CW
, Parent
(T
));
4899 -- Set remaining fields of classwide type
4901 Set_Ekind
(CW
, E_Class_Wide_Type
);
4903 Set_Scope
(CW
, Scop
);
4904 Set_Is_Tagged_Type
(CW
);
4905 Set_Is_First_Subtype
(CW
, True);
4906 Init_Size_Align
(CW
);
4907 Set_Has_Unknown_Discriminants
(CW
, True);
4908 Set_Class_Wide_Type
(CW
, CW
);
4909 Set_Equivalent_Type
(CW
, Empty
);
4910 Set_From_With_Type
(CW
, From_With_Type
(T
));
4912 -- Link type to its class-wide type
4914 Set_Class_Wide_Type
(T
, CW
);
4916 end Decorate_Tagged_Type
;
4918 ------------------------------------
4919 -- Decorate_Package_Specification --
4920 ------------------------------------
4922 procedure Decorate_Package_Specification
(P
: Entity_Id
) is
4924 -- Place only the most basic attributes
4926 Set_Ekind
(P
, E_Package
);
4927 Set_Etype
(P
, Standard_Void_Type
);
4928 end Decorate_Package_Specification
;
4930 --------------------------------
4931 -- New_Internal_Shadow_Entity --
4932 --------------------------------
4934 function New_Internal_Shadow_Entity
4935 (Kind
: Entity_Kind
;
4936 Sloc_Value
: Source_Ptr
;
4937 Id_Char
: Character) return Entity_Id
4939 E
: constant Entity_Id
:=
4940 Make_Defining_Identifier
(Sloc_Value
,
4941 Chars
=> New_Internal_Name
(Id_Char
));
4944 Set_Ekind
(E
, Kind
);
4945 Set_Is_Internal
(E
, True);
4947 if Kind
in Type_Kind
then
4948 Init_Size_Align
(E
);
4951 Append_Entity
(E
, Lim_Header
);
4954 end New_Internal_Shadow_Entity
;
4960 procedure Build_Chain
4962 First_Decl
: Node_Id
)
4964 Analyzed_Unit
: constant Boolean := Analyzed
(Cunit
(Unum
));
4965 Is_Tagged
: Boolean;
4970 while Present
(Decl
) loop
4972 -- For each library_package_declaration in the environment, there
4973 -- is an implicit declaration of a *limited view* of that library
4974 -- package. The limited view of a package contains:
4976 -- * For each nested package_declaration, a declaration of the
4977 -- limited view of that package, with the same defining-
4978 -- program-unit name.
4980 -- * For each type_declaration in the visible part, an incomplete
4981 -- type-declaration with the same defining_identifier, whose
4982 -- completion is the type_declaration. If the type_declaration
4983 -- is tagged, then the incomplete_type_declaration is tagged
4986 -- The partial view is tagged if the declaration has the
4987 -- explicit keyword, or else if it is a type extension, both
4988 -- of which can be ascertained syntactically.
4990 if Nkind
(Decl
) = N_Full_Type_Declaration
then
4992 (Nkind
(Type_Definition
(Decl
)) = N_Record_Definition
4993 and then Tagged_Present
(Type_Definition
(Decl
)))
4995 (Nkind
(Type_Definition
(Decl
)) = N_Derived_Type_Definition
4998 (Record_Extension_Part
(Type_Definition
(Decl
))));
5000 Comp_Typ
:= Defining_Identifier
(Decl
);
5002 if not Analyzed_Unit
then
5004 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5006 Decorate_Incomplete_Type
(Comp_Typ
, Scope
);
5010 -- Create shadow entity for type
5012 Lim_Typ
:= New_Internal_Shadow_Entity
5013 (Kind
=> Ekind
(Comp_Typ
),
5014 Sloc_Value
=> Sloc
(Comp_Typ
),
5017 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5018 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5019 Set_From_With_Type
(Lim_Typ
);
5022 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5024 Decorate_Incomplete_Type
(Lim_Typ
, Scope
);
5027 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5029 elsif Nkind_In
(Decl
, N_Private_Type_Declaration
,
5030 N_Incomplete_Type_Declaration
,
5031 N_Task_Type_Declaration
,
5032 N_Protected_Type_Declaration
)
5034 Comp_Typ
:= Defining_Identifier
(Decl
);
5037 Nkind_In
(Decl
, N_Private_Type_Declaration
,
5038 N_Incomplete_Type_Declaration
)
5039 and then Tagged_Present
(Decl
);
5041 if not Analyzed_Unit
then
5043 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5045 Decorate_Incomplete_Type
(Comp_Typ
, Scope
);
5049 Lim_Typ
:= New_Internal_Shadow_Entity
5050 (Kind
=> Ekind
(Comp_Typ
),
5051 Sloc_Value
=> Sloc
(Comp_Typ
),
5054 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5055 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5056 Set_From_With_Type
(Lim_Typ
);
5059 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5061 Decorate_Incomplete_Type
(Lim_Typ
, Scope
);
5064 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5066 elsif Nkind
(Decl
) = N_Private_Extension_Declaration
then
5067 Comp_Typ
:= Defining_Identifier
(Decl
);
5069 if not Analyzed_Unit
then
5070 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5073 -- Create shadow entity for type
5075 Lim_Typ
:= New_Internal_Shadow_Entity
5076 (Kind
=> Ekind
(Comp_Typ
),
5077 Sloc_Value
=> Sloc
(Comp_Typ
),
5080 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5081 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5082 Set_From_With_Type
(Lim_Typ
);
5084 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5085 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5087 elsif Nkind
(Decl
) = N_Package_Declaration
then
5092 Spec
: constant Node_Id
:= Specification
(Decl
);
5095 Comp_Typ
:= Defining_Unit_Name
(Spec
);
5097 if not Analyzed
(Cunit
(Unum
)) then
5098 Decorate_Package_Specification
(Comp_Typ
);
5099 Set_Scope
(Comp_Typ
, Scope
);
5102 Lim_Typ
:= New_Internal_Shadow_Entity
5103 (Kind
=> Ekind
(Comp_Typ
),
5104 Sloc_Value
=> Sloc
(Comp_Typ
),
5107 Decorate_Package_Specification
(Lim_Typ
);
5108 Set_Scope
(Lim_Typ
, Scope
);
5110 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5111 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5112 Set_From_With_Type
(Lim_Typ
);
5114 -- Note: The non_limited_view attribute is not used
5115 -- for local packages.
5119 First_Decl
=> First
(Visible_Declarations
(Spec
)));
5127 -- Start of processing for Build_Limited_Views
5130 pragma Assert
(Limited_Present
(N
));
5132 -- A library_item mentioned in a limited_with_clause is a package
5133 -- declaration, not a subprogram declaration, generic declaration,
5134 -- generic instantiation, or package renaming declaration.
5136 case Nkind
(Unit
(Library_Unit
(N
))) is
5137 when N_Package_Declaration
=>
5140 when N_Subprogram_Declaration
=>
5141 Error_Msg_N
("subprograms not allowed in "
5142 & "limited with_clauses", N
);
5145 when N_Generic_Package_Declaration |
5146 N_Generic_Subprogram_Declaration
=>
5147 Error_Msg_N
("generics not allowed in "
5148 & "limited with_clauses", N
);
5151 when N_Generic_Instantiation
=>
5152 Error_Msg_N
("generic instantiations not allowed in "
5153 & "limited with_clauses", N
);
5156 when N_Generic_Renaming_Declaration
=>
5157 Error_Msg_N
("generic renamings not allowed in "
5158 & "limited with_clauses", N
);
5161 when N_Subprogram_Renaming_Declaration
=>
5162 Error_Msg_N
("renamed subprograms not allowed in "
5163 & "limited with_clauses", N
);
5166 when N_Package_Renaming_Declaration
=>
5167 Error_Msg_N
("renamed packages not allowed in "
5168 & "limited with_clauses", N
);
5172 raise Program_Error
;
5175 -- Check if the chain is already built
5177 Spec
:= Specification
(Unit
(Library_Unit
(N
)));
5179 if Limited_View_Installed
(Spec
) then
5183 Set_Ekind
(P
, E_Package
);
5185 -- Build the header of the limited_view
5188 Make_Defining_Identifier
(Sloc
(N
),
5189 Chars
=> New_Internal_Name
(Id_Char
=> 'Z'));
5190 Set_Ekind
(Lim_Header
, E_Package
);
5191 Set_Is_Internal
(Lim_Header
);
5192 Set_Limited_View
(P
, Lim_Header
);
5194 -- Create the auxiliary chain. All the shadow entities are appended to
5195 -- the list of entities of the limited-view header
5199 First_Decl
=> First
(Visible_Declarations
(Spec
)));
5201 -- Save the last built shadow entity. It is needed later to set the
5202 -- reference to the first shadow entity in the private part
5204 Last_Pub_Lim_E
:= Last_Lim_E
;
5206 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5207 -- Required to give support to limited-private-with clauses
5209 Build_Chain
(Scope
=> P
,
5210 First_Decl
=> First
(Private_Declarations
(Spec
)));
5212 if Last_Pub_Lim_E
/= Empty
then
5213 Set_First_Private_Entity
(Lim_Header
,
5214 Next_Entity
(Last_Pub_Lim_E
));
5216 Set_First_Private_Entity
(Lim_Header
,
5220 Set_Limited_View_Installed
(Spec
);
5221 end Build_Limited_Views
;
5223 -------------------------------
5224 -- Check_Body_Needed_For_SAL --
5225 -------------------------------
5227 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
) is
5229 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean;
5230 -- Determine whether use of entity E might require the presence of its
5231 -- body. For a package this requires a recursive traversal of all nested
5234 ---------------------------
5235 -- Entity_Needed_For_SAL --
5236 ---------------------------
5238 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean is
5242 if Is_Subprogram
(E
)
5243 and then Has_Pragma_Inline
(E
)
5247 elsif Ekind
(E
) = E_Generic_Function
5248 or else Ekind
(E
) = E_Generic_Procedure
5252 elsif Ekind
(E
) = E_Generic_Package
5254 Nkind
(Unit_Declaration_Node
(E
)) = N_Generic_Package_Declaration
5255 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
5259 elsif Ekind
(E
) = E_Package
5261 Nkind
(Unit_Declaration_Node
(E
)) = N_Package_Declaration
5262 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
5264 Ent
:= First_Entity
(E
);
5265 while Present
(Ent
) loop
5266 if Entity_Needs_Body
(Ent
) then
5278 end Entity_Needs_Body
;
5280 -- Start of processing for Check_Body_Needed_For_SAL
5283 if Ekind
(Unit_Name
) = E_Generic_Package
5285 Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
5286 N_Generic_Package_Declaration
5288 Present
(Corresponding_Body
(Unit_Declaration_Node
(Unit_Name
)))
5290 Set_Body_Needed_For_SAL
(Unit_Name
);
5292 elsif Ekind
(Unit_Name
) = E_Generic_Procedure
5293 or else Ekind
(Unit_Name
) = E_Generic_Function
5295 Set_Body_Needed_For_SAL
(Unit_Name
);
5297 elsif Is_Subprogram
(Unit_Name
)
5298 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
5299 N_Subprogram_Declaration
5300 and then Has_Pragma_Inline
(Unit_Name
)
5302 Set_Body_Needed_For_SAL
(Unit_Name
);
5304 elsif Ekind
(Unit_Name
) = E_Subprogram_Body
then
5305 Check_Body_Needed_For_SAL
5306 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
5308 elsif Ekind
(Unit_Name
) = E_Package
5309 and then Entity_Needs_Body
(Unit_Name
)
5311 Set_Body_Needed_For_SAL
(Unit_Name
);
5313 elsif Ekind
(Unit_Name
) = E_Package_Body
5314 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) = N_Package_Body
5316 Check_Body_Needed_For_SAL
5317 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
5319 end Check_Body_Needed_For_SAL
;
5321 --------------------
5322 -- Remove_Context --
5323 --------------------
5325 procedure Remove_Context
(N
: Node_Id
) is
5326 Lib_Unit
: constant Node_Id
:= Unit
(N
);
5329 -- If this is a child unit, first remove the parent units
5331 if Is_Child_Spec
(Lib_Unit
) then
5332 Remove_Parents
(Lib_Unit
);
5335 Remove_Context_Clauses
(N
);
5338 ----------------------------
5339 -- Remove_Context_Clauses --
5340 ----------------------------
5342 procedure Remove_Context_Clauses
(N
: Node_Id
) is
5344 Unit_Name
: Entity_Id
;
5347 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5348 -- limited-views first and regular-views later (to maintain the
5351 -- First Phase: Remove limited_with context clauses
5353 Item
:= First
(Context_Items
(N
));
5354 while Present
(Item
) loop
5356 -- We are interested only in with clauses which got installed
5359 if Nkind
(Item
) = N_With_Clause
5360 and then Limited_Present
(Item
)
5361 and then Limited_View_Installed
(Item
)
5363 Remove_Limited_With_Clause
(Item
);
5369 -- Second Phase: Loop through context items and undo regular
5370 -- with_clauses and use_clauses.
5372 Item
:= First
(Context_Items
(N
));
5373 while Present
(Item
) loop
5375 -- We are interested only in with clauses which got installed on
5376 -- entry, as indicated by their Context_Installed flag set
5378 if Nkind
(Item
) = N_With_Clause
5379 and then Limited_Present
(Item
)
5380 and then Limited_View_Installed
(Item
)
5384 elsif Nkind
(Item
) = N_With_Clause
5385 and then Context_Installed
(Item
)
5387 -- Remove items from one with'ed unit
5389 Unit_Name
:= Entity
(Name
(Item
));
5390 Remove_Unit_From_Visibility
(Unit_Name
);
5391 Set_Context_Installed
(Item
, False);
5393 elsif Nkind
(Item
) = N_Use_Package_Clause
then
5394 End_Use_Package
(Item
);
5396 elsif Nkind
(Item
) = N_Use_Type_Clause
then
5397 End_Use_Type
(Item
);
5402 end Remove_Context_Clauses
;
5404 --------------------------------
5405 -- Remove_Limited_With_Clause --
5406 --------------------------------
5408 procedure Remove_Limited_With_Clause
(N
: Node_Id
) is
5409 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
5412 Lim_Header
: Entity_Id
;
5413 Lim_Typ
: Entity_Id
;
5417 pragma Assert
(Limited_View_Installed
(N
));
5419 -- In case of limited with_clause on subprograms, generics, instances,
5420 -- or renamings, the corresponding error was previously posted and we
5421 -- have nothing to do here.
5423 if Nkind
(P_Unit
) /= N_Package_Declaration
then
5427 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
5429 -- Handle child packages
5431 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
5432 P
:= Defining_Identifier
(P
);
5435 if Debug_Flag_I
then
5436 Write_Str
("remove limited view of ");
5437 Write_Name
(Chars
(P
));
5438 Write_Str
(" from visibility");
5442 -- Prepare the removal of the shadow entities from visibility. The
5443 -- first element of the limited view is a header (an E_Package
5444 -- entity) that is used to reference the first shadow entity in the
5445 -- private part of the package
5447 Lim_Header
:= Limited_View
(P
);
5448 Lim_Typ
:= First_Entity
(Lim_Header
);
5450 -- Remove package and shadow entities from visibility if it has not
5453 if not Analyzed
(P_Unit
) then
5455 Set_Is_Immediately_Visible
(P
, False);
5457 while Present
(Lim_Typ
) loop
5459 Next_Entity
(Lim_Typ
);
5462 -- Otherwise this package has already appeared in the closure and its
5463 -- shadow entities must be replaced by its real entities. This code
5464 -- must be kept synchronized with the complementary code in Install
5465 -- Limited_Withed_Unit.
5468 -- Real entities that are type or subtype declarations were hidden
5469 -- from visibility at the point of installation of the limited-view.
5470 -- Now we recover the previous value of the hidden attribute.
5472 E
:= First_Entity
(P
);
5473 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
5475 Set_Is_Hidden
(E
, Was_Hidden
(E
));
5481 while Present
(Lim_Typ
)
5482 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
5484 -- Nested packages and child units were not unchained
5486 if Ekind
(Lim_Typ
) /= E_Package
5487 and then not Is_Child_Unit
(Non_Limited_View
(Lim_Typ
))
5489 -- Handle incomplete types of the real view. For this purpose
5490 -- we traverse the list of visible entities to look for an
5491 -- incomplete type in the real-view associated with Lim_Typ.
5493 E
:= First_Entity
(P
);
5494 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
5495 exit when Ekind
(E
) = E_Incomplete_Type
5496 and then Present
(Full_View
(E
))
5497 and then Full_View
(E
) = Lim_Typ
;
5502 -- If the previous search was not successful then the entity
5503 -- to be restored in the homonym list is the non-limited view
5505 if E
= First_Private_Entity
(P
) then
5506 E
:= Non_Limited_View
(Lim_Typ
);
5509 pragma Assert
(not In_Chain
(E
));
5511 Prev
:= Current_Entity
(Lim_Typ
);
5513 if Prev
= Lim_Typ
then
5514 Set_Current_Entity
(E
);
5517 while Present
(Prev
)
5518 and then Homonym
(Prev
) /= Lim_Typ
5520 Prev
:= Homonym
(Prev
);
5523 if Present
(Prev
) then
5524 Set_Homonym
(Prev
, E
);
5528 -- We must also set the next homonym entity of the real entity
5529 -- to handle the case in which the next homonym was a shadow
5532 Set_Homonym
(E
, Homonym
(Lim_Typ
));
5535 Next_Entity
(Lim_Typ
);
5539 -- Indicate that the limited view of the package is not installed
5541 Set_From_With_Type
(P
, False);
5542 Set_Limited_View_Installed
(N
, False);
5543 end Remove_Limited_With_Clause
;
5545 --------------------
5546 -- Remove_Parents --
5547 --------------------
5549 procedure Remove_Parents
(Lib_Unit
: Node_Id
) is
5552 P_Spec
: Node_Id
:= Empty
;
5554 Vis
: constant Boolean :=
5555 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
;
5558 if Is_Child_Spec
(Lib_Unit
) then
5559 P_Spec
:= Parent_Spec
(Lib_Unit
);
5561 elsif Nkind
(Lib_Unit
) = N_Package_Body
5562 and then Nkind
(Original_Node
(Lib_Unit
)) = N_Package_Instantiation
5564 P_Spec
:= Parent_Spec
(Original_Node
(Lib_Unit
));
5567 if Present
(P_Spec
) then
5570 P_Name
:= Get_Parent_Entity
(P
);
5571 Remove_Context_Clauses
(P_Spec
);
5572 End_Package_Scope
(P_Name
);
5573 Set_Is_Immediately_Visible
(P_Name
, Vis
);
5575 -- Remove from visibility the siblings as well, which are directly
5576 -- visible while the parent is in scope.
5578 E
:= First_Entity
(P_Name
);
5579 while Present
(E
) loop
5580 if Is_Child_Unit
(E
) then
5581 Set_Is_Immediately_Visible
(E
, False);
5587 Set_In_Package_Body
(P_Name
, False);
5589 -- This is the recursive call to remove the context of any
5590 -- higher level parent. This recursion ensures that all parents
5591 -- are removed in the reverse order of their installation.
5597 ---------------------------------
5598 -- Remove_Private_With_Clauses --
5599 ---------------------------------
5601 procedure Remove_Private_With_Clauses
(Comp_Unit
: Node_Id
) is
5604 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean;
5605 -- Check whether a given unit appears in a regular with_clause.
5606 -- Used to determine whether a private_with_clause, implicit or
5607 -- explicit, should be ignored.
5609 ----------------------------
5610 -- In_Regular_With_Clause --
5611 ----------------------------
5613 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean
5618 Item
:= First
(Context_Items
(Comp_Unit
));
5619 while Present
(Item
) loop
5620 if Nkind
(Item
) = N_With_Clause
5621 and then Entity
(Name
(Item
)) = E
5622 and then not Private_Present
(Item
)
5630 end In_Regular_With_Clause
;
5632 -- Start of processing for Remove_Private_With_Clauses
5635 Item
:= First
(Context_Items
(Comp_Unit
));
5636 while Present
(Item
) loop
5637 if Nkind
(Item
) = N_With_Clause
5638 and then Private_Present
(Item
)
5640 -- If private_with_clause is redundant, remove it from
5641 -- context, as a small optimization to subsequent handling
5642 -- of private_with clauses in other nested packages..
5644 if In_Regular_With_Clause
(Entity
(Name
(Item
))) then
5646 Nxt
: constant Node_Id
:= Next
(Item
);
5652 elsif Limited_Present
(Item
) then
5653 if not Limited_View_Installed
(Item
) then
5654 Remove_Limited_With_Clause
(Item
);
5660 Remove_Unit_From_Visibility
(Entity
(Name
(Item
)));
5661 Set_Context_Installed
(Item
, False);
5669 end Remove_Private_With_Clauses
;
5671 ---------------------------------
5672 -- Remove_Unit_From_Visibility --
5673 ---------------------------------
5675 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
) is
5676 P
: constant Entity_Id
:= Scope
(Unit_Name
);
5679 if Debug_Flag_I
then
5680 Write_Str
("remove unit ");
5681 Write_Name
(Chars
(Unit_Name
));
5682 Write_Str
(" from visibility");
5686 if P
/= Standard_Standard
then
5687 Set_Is_Visible_Child_Unit
(Unit_Name
, False);
5690 Set_Is_Potentially_Use_Visible
(Unit_Name
, False);
5691 Set_Is_Immediately_Visible
(Unit_Name
, False);
5692 end Remove_Unit_From_Visibility
;
5707 procedure Unchain
(E
: Entity_Id
) is
5711 Prev
:= Current_Entity
(E
);
5717 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
5720 while Present
(Prev
)
5721 and then Homonym
(Prev
) /= E
5723 Prev
:= Homonym
(Prev
);
5726 if Present
(Prev
) then
5727 Set_Homonym
(Prev
, Homonym
(E
));
5731 if Debug_Flag_I
then
5732 Write_Str
(" (homonym) unchain ");
5733 Write_Name
(Chars
(E
));