1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, 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
734 -- in its scope. Finally we create a Units table entry for
735 -- the subprogram declaration, to maintain a one-to-one
736 -- correspondence with compilation unit nodes. This is
737 -- critical for the tree traversals performed by Codepeer.
740 Loc
: constant Source_Ptr
:= Sloc
(N
);
741 SCS
: constant Boolean :=
742 Get_Comes_From_Source_Default
;
745 Set_Comes_From_Source_Default
(False);
747 Make_Compilation_Unit
(Loc
,
748 Context_Items
=> New_Copy_List
(Context_Items
(N
)),
750 Make_Subprogram_Declaration
(Sloc
(N
),
753 (Specification
(Unit_Node
))),
755 Make_Compilation_Unit_Aux
(Loc
));
757 Set_Library_Unit
(N
, Lib_Unit
);
758 Set_Parent_Spec
(Unit
(Lib_Unit
), Cunit
(Unum
));
759 Make_Child_Decl_Unit
(N
);
760 Semantics
(Lib_Unit
);
762 -- Now that a separate declaration exists, the body
763 -- of the child unit does not act as spec any longer.
765 Set_Acts_As_Spec
(N
, False);
766 Set_Is_Child_Unit
(Defining_Entity
(Unit_Node
));
767 Set_Debug_Info_Needed
(Defining_Entity
(Unit
(Lib_Unit
)));
768 Set_Comes_From_Source_Default
(SCS
);
773 -- Here for subprogram with separate declaration
776 Semantics
(Lib_Unit
);
777 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
778 Version_Update
(N
, Lib_Unit
);
781 -- If this is a child unit, generate references to the parents
783 if Nkind
(Defining_Unit_Name
(Specification
(Unit_Node
))) =
784 N_Defining_Program_Unit_Name
786 Generate_Parent_References
(
787 Specification
(Unit_Node
),
788 Scope
(Defining_Entity
(Unit
(Lib_Unit
))));
792 -- If it is a child unit, the parent must be elaborated first and we
793 -- update version, since we are dependent on our parent.
795 if Is_Child_Spec
(Unit_Node
) then
797 -- The analysis of the parent is done with style checks off
800 Save_Style_Check
: constant Boolean := Style_Check
;
801 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
802 Cunit_Boolean_Restrictions_Save
;
805 if not GNAT_Mode
then
806 Style_Check
:= False;
809 Semantics
(Parent_Spec
(Unit_Node
));
810 Version_Update
(N
, Parent_Spec
(Unit_Node
));
811 Style_Check
:= Save_Style_Check
;
812 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
816 -- With the analysis done, install the context. Note that we can't
817 -- install the context from the with clauses as we analyze them, because
818 -- each with clause must be analyzed in a clean visibility context, so
819 -- we have to wait and install them all at once.
823 if Is_Child_Spec
(Unit_Node
) then
825 -- Set the entities of all parents in the program_unit_name
827 Generate_Parent_References
(
828 Unit_Node
, Get_Parent_Entity
(Unit
(Parent_Spec
(Unit_Node
))));
831 -- All components of the context: with-clauses, library unit, ancestors
832 -- if any, (and their context) are analyzed and installed.
834 -- Call special debug routine sm if this is the main unit
836 if Current_Sem_Unit
= Main_Unit
then
840 -- Now analyze the unit (package, subprogram spec, body) itself
844 if Warn_On_Redundant_Constructs
then
845 Check_Redundant_Withs
(Context_Items
(N
));
847 if Nkind
(Unit_Node
) = N_Package_Body
then
848 Check_Redundant_Withs
849 (Context_Items
=> Context_Items
(N
),
850 Spec_Context_Items
=> Context_Items
(Lib_Unit
));
854 -- The above call might have made Unit_Node an N_Subprogram_Body from
855 -- something else, so propagate any Acts_As_Spec flag.
857 if Nkind
(Unit_Node
) = N_Subprogram_Body
858 and then Acts_As_Spec
(Unit_Node
)
860 Set_Acts_As_Spec
(N
);
863 -- Register predefined units in Rtsfind
866 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Sloc
(N
));
868 if Is_Predefined_File_Name
(Unit_File_Name
(Unum
)) then
869 Set_RTU_Loaded
(Unit_Node
);
873 -- Treat compilation unit pragmas that appear after the library unit
875 if Present
(Pragmas_After
(Aux_Decls_Node
(N
))) then
877 Prag_Node
: Node_Id
:= First
(Pragmas_After
(Aux_Decls_Node
(N
)));
879 while Present
(Prag_Node
) loop
886 -- Generate distribution stubs if requested and no error
889 and then (Distribution_Stub_Mode
= Generate_Receiver_Stub_Body
891 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
892 and then not Fatal_Error
(Main_Unit
)
894 if Is_RCI_Pkg_Spec_Or_Body
(N
) then
896 -- Regular RCI package
898 Add_Stub_Constructs
(N
);
900 elsif (Nkind
(Unit_Node
) = N_Package_Declaration
901 and then Is_Shared_Passive
(Defining_Entity
902 (Specification
(Unit_Node
))))
903 or else (Nkind
(Unit_Node
) = N_Package_Body
905 Is_Shared_Passive
(Corresponding_Spec
(Unit_Node
)))
907 -- Shared passive package
909 Add_Stub_Constructs
(N
);
911 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
913 Is_Remote_Call_Interface
914 (Defining_Entity
(Specification
(Instance_Spec
(Unit_Node
))))
916 -- Instantiation of a RCI generic package
918 Add_Stub_Constructs
(N
);
922 -- Remove unit from visibility, so that environment is clean for
923 -- the next compilation, which is either the main unit or some
924 -- other unit in the context.
926 if Nkind_In
(Unit_Node
, N_Package_Declaration
,
927 N_Package_Renaming_Declaration
,
928 N_Subprogram_Declaration
)
929 or else Nkind
(Unit_Node
) in N_Generic_Declaration
931 (Nkind
(Unit_Node
) = N_Subprogram_Body
932 and then Acts_As_Spec
(Unit_Node
))
934 Remove_Unit_From_Visibility
(Defining_Entity
(Unit_Node
));
936 -- If the unit is an instantiation whose body will be elaborated for
937 -- inlining purposes, use the proper entity of the instance. The
938 -- entity may be missing if the instantiation was illegal.
940 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
941 and then not Error_Posted
(Unit_Node
)
942 and then Present
(Instance_Spec
(Unit_Node
))
944 Remove_Unit_From_Visibility
945 (Defining_Entity
(Instance_Spec
(Unit_Node
)));
947 elsif Nkind
(Unit_Node
) = N_Package_Body
948 or else (Nkind
(Unit_Node
) = N_Subprogram_Body
949 and then not Acts_As_Spec
(Unit_Node
))
951 -- Bodies that are not the main unit are compiled if they are generic
952 -- or contain generic or inlined units. Their analysis brings in the
953 -- context of the corresponding spec (unit declaration) which must be
954 -- removed as well, to return the compilation environment to its
957 Remove_Context
(Lib_Unit
);
958 Set_Is_Immediately_Visible
(Defining_Entity
(Unit
(Lib_Unit
)), False);
961 -- Last step is to deinstall the context we just installed as well as
962 -- the unit just compiled.
966 -- If this is the main unit and we are generating code, we must check
967 -- that all generic units in the context have a body if they need it,
968 -- even if they have not been instantiated. In the absence of .ali files
969 -- for generic units, we must force the load of the body, just to
970 -- produce the proper error if the body is absent. We skip this
971 -- verification if the main unit itself is generic.
973 if Get_Cunit_Unit_Number
(N
) = Main_Unit
974 and then Operating_Mode
= Generate_Code
975 and then Expander_Active
977 -- Check whether the source for the body of the unit must be included
978 -- in a standalone library.
980 Check_Body_Needed_For_SAL
(Cunit_Entity
(Main_Unit
));
982 -- Indicate that the main unit is now analyzed, to catch possible
983 -- circularities between it and generic bodies. Remove main unit from
984 -- visibility. This might seem superfluous, but the main unit must
985 -- not be visible in the generic body expansions that follow.
987 Set_Analyzed
(N
, True);
988 Set_Is_Immediately_Visible
(Cunit_Entity
(Main_Unit
), False);
993 Un
: Unit_Number_Type
;
995 Save_Style_Check
: constant Boolean := Style_Check
;
996 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
997 Cunit_Boolean_Restrictions_Save
;
1000 Item
:= First
(Context_Items
(N
));
1001 while Present
(Item
) loop
1003 -- Check for explicit with clause
1005 if Nkind
(Item
) = N_With_Clause
1006 and then not Implicit_With
(Item
)
1008 -- Ada 2005 (AI-50217): Ignore limited-withed units
1010 and then not Limited_Present
(Item
)
1012 Nam
:= Entity
(Name
(Item
));
1014 -- Compile generic subprogram, unless it is intrinsic or
1015 -- imported so no body is required, or generic package body
1016 -- if the package spec requires a body.
1018 if (Is_Generic_Subprogram
(Nam
)
1019 and then not Is_Intrinsic_Subprogram
(Nam
)
1020 and then not Is_Imported
(Nam
))
1021 or else (Ekind
(Nam
) = E_Generic_Package
1022 and then Unit_Requires_Body
(Nam
))
1024 Style_Check
:= False;
1026 if Present
(Renamed_Object
(Nam
)) then
1029 (Load_Name
=> Get_Body_Name
1031 (Unit_Declaration_Node
1032 (Renamed_Object
(Nam
)))),
1040 (Load_Name
=> Get_Body_Name
1041 (Get_Unit_Name
(Item
)),
1048 if Un
= No_Unit
then
1050 ("body of generic unit& not found", Item
, Nam
);
1053 elsif not Analyzed
(Cunit
(Un
))
1054 and then Un
/= Main_Unit
1055 and then not Fatal_Error
(Un
)
1057 Style_Check
:= False;
1058 Semantics
(Cunit
(Un
));
1066 Style_Check
:= Save_Style_Check
;
1067 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
1071 -- Deal with creating elaboration Boolean if needed. We create an
1072 -- elaboration boolean only for units that come from source since
1073 -- units manufactured by the compiler never need elab checks.
1075 if Comes_From_Source
(N
)
1076 and then Nkind_In
(Unit_Node
, N_Package_Declaration
,
1077 N_Generic_Package_Declaration
,
1078 N_Subprogram_Declaration
,
1079 N_Generic_Subprogram_Declaration
)
1082 Loc
: constant Source_Ptr
:= Sloc
(N
);
1083 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Loc
);
1086 Spec_Id
:= Defining_Entity
(Unit_Node
);
1087 Generate_Definition
(Spec_Id
);
1089 -- See if an elaboration entity is required for possible access
1090 -- before elaboration checking. Note that we must allow for this
1091 -- even if -gnatE is not set, since a client may be compiled in
1092 -- -gnatE mode and reference the entity.
1094 -- These entities are also used by the binder to prevent multiple
1095 -- attempts to execute the elaboration code for the library case
1096 -- where the elaboration routine might otherwise be called more
1099 -- Case of units which do not require elaboration checks
1102 -- Pure units do not need checks
1106 -- Preelaborated units do not need checks
1108 or else Is_Preelaborated
(Spec_Id
)
1110 -- No checks needed if pragma Elaborate_Body present
1112 or else Has_Pragma_Elaborate_Body
(Spec_Id
)
1114 -- No checks needed if unit does not require a body
1116 or else not Unit_Requires_Body
(Spec_Id
)
1118 -- No checks needed for predefined files
1120 or else Is_Predefined_File_Name
(Unit_File_Name
(Unum
))
1122 -- No checks required if no separate spec
1124 or else Acts_As_Spec
(N
)
1126 -- This is a case where we only need the entity for
1127 -- checking to prevent multiple elaboration checks.
1129 Set_Elaboration_Entity_Required
(Spec_Id
, False);
1131 -- Case of elaboration entity is required for access before
1132 -- elaboration checking (so certainly we must build it!)
1135 Set_Elaboration_Entity_Required
(Spec_Id
, True);
1138 Build_Elaboration_Entity
(N
, Spec_Id
);
1142 -- Freeze the compilation unit entity. This for sure is needed because
1143 -- of some warnings that can be output (see Freeze_Subprogram), but may
1144 -- in general be required. If freezing actions result, place them in the
1145 -- compilation unit actions list, and analyze them.
1148 Loc
: constant Source_Ptr
:= Sloc
(N
);
1149 L
: constant List_Id
:=
1150 Freeze_Entity
(Cunit_Entity
(Current_Sem_Unit
), Loc
);
1152 while Is_Non_Empty_List
(L
) loop
1153 Insert_Library_Level_Action
(Remove_Head
(L
));
1159 if Nkind
(Unit_Node
) = N_Package_Declaration
1160 and then Get_Cunit_Unit_Number
(N
) /= Main_Unit
1161 and then Expander_Active
1164 Save_Style_Check
: constant Boolean := Style_Check
;
1165 Save_Warning
: constant Warning_Mode_Type
:= Warning_Mode
;
1166 Options
: Style_Check_Options
;
1169 Save_Style_Check_Options
(Options
);
1170 Reset_Style_Check_Options
;
1171 Opt
.Warning_Mode
:= Suppress
;
1172 Check_Body_For_Inlining
(N
, Defining_Entity
(Unit_Node
));
1174 Reset_Style_Check_Options
;
1175 Set_Style_Check_Options
(Options
);
1176 Style_Check
:= Save_Style_Check
;
1177 Warning_Mode
:= Save_Warning
;
1181 -- If we are generating obsolescent warnings, then here is where we
1182 -- generate them for the with'ed items. The reason for this special
1183 -- processing is that the normal mechanism of generating the warnings
1184 -- for referenced entities does not work for context clause references.
1185 -- That's because when we first analyze the context, it is too early to
1186 -- know if the with'ing unit is itself obsolescent (which suppresses
1189 if not GNAT_Mode
and then Warn_On_Obsolescent_Feature
then
1191 -- Push current compilation unit as scope, so that the test for
1192 -- being within an obsolescent unit will work correctly.
1194 Push_Scope
(Defining_Entity
(Unit_Node
));
1196 -- Loop through context items to deal with with clauses
1204 Item
:= First
(Context_Items
(N
));
1205 while Present
(Item
) loop
1206 if Nkind
(Item
) = N_With_Clause
1208 -- Suppress this check in limited-withed units. Further work
1209 -- needed here if we decide to incorporate this check on
1210 -- limited-withed units.
1212 and then not Limited_Present
(Item
)
1215 Ent
:= Entity
(Nam
);
1217 if Is_Obsolescent
(Ent
) then
1218 Output_Obsolescent_Entity_Warnings
(Nam
, Ent
);
1226 -- Remove temporary install of current unit as scope
1230 end Analyze_Compilation_Unit
;
1232 ---------------------
1233 -- Analyze_Context --
1234 ---------------------
1236 procedure Analyze_Context
(N
: Node_Id
) is
1237 Ukind
: constant Node_Kind
:= Nkind
(Unit
(N
));
1241 -- First process all configuration pragmas at the start of the context
1242 -- items. Strictly these are not part of the context clause, but that
1243 -- is where the parser puts them. In any case for sure we must analyze
1244 -- these before analyzing the actual context items, since they can have
1245 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1246 -- be with'ed as a result of changing categorizations in Ada 2005).
1248 Item
:= First
(Context_Items
(N
));
1249 while Present
(Item
)
1250 and then Nkind
(Item
) = N_Pragma
1251 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
1257 -- This is the point at which we capture the configuration settings
1258 -- for the unit. At the moment only the Optimize_Alignment setting
1259 -- needs to be captured. Probably more later ???
1261 if Optimize_Alignment_Local
then
1262 Set_OA_Setting
(Current_Sem_Unit
, 'L');
1264 Set_OA_Setting
(Current_Sem_Unit
, Optimize_Alignment
);
1267 -- Loop through actual context items. This is done in two passes:
1269 -- a) The first pass analyzes non-limited with-clauses and also any
1270 -- configuration pragmas (we need to get the latter analyzed right
1271 -- away, since they can affect processing of subsequent items.
1273 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1275 while Present
(Item
) loop
1277 -- For with clause, analyze the with clause, and then update
1278 -- the version, since we are dependent on a unit that we with.
1280 if Nkind
(Item
) = N_With_Clause
1281 and then not Limited_Present
(Item
)
1283 -- Skip analyzing with clause if no unit, nothing to do (this
1284 -- happens for a with that references a non-existent unit)
1285 -- Skip as well if this is a with_clause for the main unit, which
1286 -- happens if a subunit has a useless with_clause on its parent.
1288 if Present
(Library_Unit
(Item
)) then
1289 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
) then
1293 Set_Entity
(Name
(Item
), Cunit_Entity
(Current_Sem_Unit
));
1297 if not Implicit_With
(Item
) then
1298 Version_Update
(N
, Library_Unit
(Item
));
1301 -- Skip pragmas. Configuration pragmas at the start were handled in
1302 -- the loop above, and remaining pragmas are not processed until we
1303 -- actually install the context (see Install_Context). We delay the
1304 -- analysis of these pragmas to make sure that we have installed all
1305 -- the implicit with's on parent units.
1307 -- Skip use clauses at this stage, since we don't want to do any
1308 -- installing of potentially use-visible entities until we
1309 -- actually install the complete context (in Install_Context).
1310 -- Otherwise things can get installed in the wrong context.
1319 -- Second pass: examine all limited_with clauses. All other context
1320 -- items are ignored in this pass.
1322 Item
:= First
(Context_Items
(N
));
1323 while Present
(Item
) loop
1324 if Nkind
(Item
) = N_With_Clause
1325 and then Limited_Present
(Item
)
1327 -- No need to check errors on implicitly generated limited-with
1330 if not Implicit_With
(Item
) then
1332 -- Verify that the illegal contexts given in 10.1.2 (18/2)
1333 -- are properly rejected, including renaming declarations.
1335 if not Nkind_In
(Ukind
, N_Package_Declaration
,
1336 N_Subprogram_Declaration
)
1337 and then Ukind
not in N_Generic_Declaration
1338 and then Ukind
not in N_Generic_Instantiation
1340 Error_Msg_N
("limited with_clause not allowed here", Item
);
1342 -- Check wrong use of a limited with clause applied to the
1343 -- compilation unit containing the limited-with clause.
1345 -- limited with P.Q;
1346 -- package P.Q is ...
1348 elsif Unit
(Library_Unit
(Item
)) = Unit
(N
) then
1349 Error_Msg_N
("wrong use of limited-with clause", Item
);
1351 -- Check wrong use of limited-with clause applied to some
1352 -- immediate ancestor.
1354 elsif Is_Child_Spec
(Unit
(N
)) then
1356 Lib_U
: constant Entity_Id
:= Unit
(Library_Unit
(Item
));
1360 P
:= Parent_Spec
(Unit
(N
));
1362 if Unit
(P
) = Lib_U
then
1363 Error_Msg_N
("limited with_clause of immediate "
1364 & "ancestor not allowed", Item
);
1368 exit when not Is_Child_Spec
(Unit
(P
));
1369 P
:= Parent_Spec
(Unit
(P
));
1374 -- Check if the limited-withed unit is already visible through
1375 -- some context clause of the current compilation unit or some
1376 -- ancestor of the current compilation unit.
1379 Lim_Unit_Name
: constant Node_Id
:= Name
(Item
);
1380 Comp_Unit
: Node_Id
;
1382 Unit_Name
: Node_Id
;
1387 It
:= First
(Context_Items
(Comp_Unit
));
1388 while Present
(It
) loop
1390 and then Nkind
(It
) = N_With_Clause
1391 and then not Limited_Present
(It
)
1393 Nkind_In
(Unit
(Library_Unit
(It
)),
1394 N_Package_Declaration
,
1395 N_Package_Renaming_Declaration
)
1397 if Nkind
(Unit
(Library_Unit
(It
))) =
1398 N_Package_Declaration
1400 Unit_Name
:= Name
(It
);
1402 Unit_Name
:= Name
(Unit
(Library_Unit
(It
)));
1405 -- Check if the named package (or some ancestor)
1406 -- leaves visible the full-view of the unit given
1407 -- in the limited-with clause
1410 if Designate_Same_Unit
(Lim_Unit_Name
,
1413 Error_Msg_Sloc
:= Sloc
(It
);
1415 ("simultaneous visibility of limited "
1416 & "and unlimited views not allowed",
1419 ("\unlimited view visible through "
1420 & "context clause #",
1424 elsif Nkind
(Unit_Name
) = N_Identifier
then
1428 Unit_Name
:= Prefix
(Unit_Name
);
1435 exit when not Is_Child_Spec
(Unit
(Comp_Unit
));
1437 Comp_Unit
:= Parent_Spec
(Unit
(Comp_Unit
));
1442 -- Skip analyzing with clause if no unit, see above
1444 if Present
(Library_Unit
(Item
)) then
1448 -- A limited_with does not impose an elaboration order, but
1449 -- there is a semantic dependency for recompilation purposes.
1451 if not Implicit_With
(Item
) then
1452 Version_Update
(N
, Library_Unit
(Item
));
1455 -- Pragmas and use clauses and with clauses other than limited
1456 -- with's are ignored in this pass through the context items.
1464 end Analyze_Context
;
1466 -------------------------------
1467 -- Analyze_Package_Body_Stub --
1468 -------------------------------
1470 procedure Analyze_Package_Body_Stub
(N
: Node_Id
) is
1471 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1475 -- The package declaration must be in the current declarative part
1477 Check_Stub_Level
(N
);
1478 Nam
:= Current_Entity_In_Scope
(Id
);
1480 if No
(Nam
) or else not Is_Package_Or_Generic_Package
(Nam
) then
1481 Error_Msg_N
("missing specification for package stub", N
);
1483 elsif Has_Completion
(Nam
)
1484 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(Nam
)))
1486 Error_Msg_N
("duplicate or redundant stub for package", N
);
1489 -- Indicate that the body of the package exists. If we are doing
1490 -- only semantic analysis, the stub stands for the body. If we are
1491 -- generating code, the existence of the body will be confirmed
1492 -- when we load the proper body.
1494 Set_Has_Completion
(Nam
);
1495 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1496 Generate_Reference
(Nam
, Id
, 'b');
1497 Analyze_Proper_Body
(N
, Nam
);
1499 end Analyze_Package_Body_Stub
;
1501 -------------------------
1502 -- Analyze_Proper_Body --
1503 -------------------------
1505 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
) is
1506 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
1507 Unum
: Unit_Number_Type
;
1509 procedure Optional_Subunit
;
1510 -- This procedure is called when the main unit is a stub, or when we
1511 -- are not generating code. In such a case, we analyze the subunit if
1512 -- present, which is user-friendly and in fact required for ASIS, but
1513 -- we don't complain if the subunit is missing.
1515 ----------------------
1516 -- Optional_Subunit --
1517 ----------------------
1519 procedure Optional_Subunit
is
1520 Comp_Unit
: Node_Id
;
1523 -- Try to load subunit, but ignore any errors that occur during
1524 -- the loading of the subunit, by using the special feature in
1525 -- Errout to ignore all errors. Note that Fatal_Error will still
1526 -- be set, so we will be able to check for this case below.
1528 if not ASIS_Mode
then
1529 Ignore_Errors_Enable
:= Ignore_Errors_Enable
+ 1;
1534 (Load_Name
=> Subunit_Name
,
1539 if not ASIS_Mode
then
1540 Ignore_Errors_Enable
:= Ignore_Errors_Enable
- 1;
1543 -- All done if we successfully loaded the subunit
1546 and then (not Fatal_Error
(Unum
) or else Try_Semantics
)
1548 Comp_Unit
:= Cunit
(Unum
);
1550 -- If the file was empty or seriously mangled, the unit
1551 -- itself may be missing.
1553 if No
(Unit
(Comp_Unit
)) then
1555 ("subunit does not contain expected proper body", N
);
1557 elsif Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1559 ("expected SEPARATE subunit, found child unit",
1560 Cunit_Entity
(Unum
));
1562 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1563 Analyze_Subunit
(Comp_Unit
);
1564 Set_Library_Unit
(N
, Comp_Unit
);
1567 elsif Unum
= No_Unit
1568 and then Present
(Nam
)
1570 if Is_Protected_Type
(Nam
) then
1571 Set_Corresponding_Body
(Parent
(Nam
), Defining_Identifier
(N
));
1573 Set_Corresponding_Body
(
1574 Unit_Declaration_Node
(Nam
), Defining_Identifier
(N
));
1577 end Optional_Subunit
;
1579 -- Start of processing for Analyze_Proper_Body
1582 -- If the subunit is already loaded, it means that the main unit
1583 -- is a subunit, and that the current unit is one of its parents
1584 -- which was being analyzed to provide the needed context for the
1585 -- analysis of the subunit. In this case we analyze the subunit and
1586 -- continue with the parent, without looking a subsequent subunits.
1588 if Is_Loaded
(Subunit_Name
) then
1590 -- If the proper body is already linked to the stub node,
1591 -- the stub is in a generic unit and just needs analyzing.
1593 if Present
(Library_Unit
(N
)) then
1594 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1595 Analyze_Subunit
(Library_Unit
(N
));
1597 -- Otherwise we must load the subunit and link to it
1600 -- Load the subunit, this must work, since we originally
1601 -- loaded the subunit earlier on. So this will not really
1602 -- load it, just give access to it.
1606 (Load_Name
=> Subunit_Name
,
1611 -- And analyze the subunit in the parent context (note that we
1612 -- do not call Semantics, since that would remove the parent
1613 -- context). Because of this, we have to manually reset the
1614 -- compiler state to Analyzing since it got destroyed by Load.
1616 if Unum
/= No_Unit
then
1617 Compiler_State
:= Analyzing
;
1619 -- Check that the proper body is a subunit and not a child
1620 -- unit. If the unit was previously loaded, the error will
1621 -- have been emitted when copying the generic node, so we
1622 -- just return to avoid cascaded errors.
1624 if Nkind
(Unit
(Cunit
(Unum
))) /= N_Subunit
then
1628 Set_Corresponding_Stub
(Unit
(Cunit
(Unum
)), N
);
1629 Analyze_Subunit
(Cunit
(Unum
));
1630 Set_Library_Unit
(N
, Cunit
(Unum
));
1634 -- If the main unit is a subunit, then we are just performing semantic
1635 -- analysis on that subunit, and any other subunits of any parent unit
1636 -- should be ignored, except that if we are building trees for ASIS
1637 -- usage we want to annotate the stub properly.
1639 elsif Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
1640 and then Subunit_Name
/= Unit_Name
(Main_Unit
)
1646 -- But before we return, set the flag for unloaded subunits. This
1647 -- will suppress junk warnings of variables in the same declarative
1648 -- part (or a higher level one) that are in danger of looking unused
1649 -- when in fact there might be a declaration in the subunit that we
1650 -- do not intend to load.
1652 Unloaded_Subunits
:= True;
1655 -- If the subunit is not already loaded, and we are generating code,
1656 -- then this is the case where compilation started from the parent,
1657 -- and we are generating code for an entire subunit tree. In that
1658 -- case we definitely need to load the subunit.
1660 -- In order to continue the analysis with the rest of the parent,
1661 -- and other subunits, we load the unit without requiring its
1662 -- presence, and emit a warning if not found, rather than terminating
1663 -- the compilation abruptly, as for other missing file problems.
1665 elsif Original_Operating_Mode
= Generate_Code
then
1667 -- If the proper body is already linked to the stub node,
1668 -- the stub is in a generic unit and just needs analyzing.
1670 -- We update the version. Although we are not technically
1671 -- semantically dependent on the subunit, given our approach
1672 -- of macro substitution of subunits, it makes sense to
1673 -- include it in the version identification.
1675 if Present
(Library_Unit
(N
)) then
1676 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1677 Analyze_Subunit
(Library_Unit
(N
));
1678 Version_Update
(Cunit
(Main_Unit
), Library_Unit
(N
));
1680 -- Otherwise we must load the subunit and link to it
1685 (Load_Name
=> Subunit_Name
,
1690 if Original_Operating_Mode
= Generate_Code
1691 and then Unum
= No_Unit
1693 Error_Msg_Unit_1
:= Subunit_Name
;
1695 Get_File_Name
(Subunit_Name
, Subunit
=> True);
1697 ("subunit$$ in file{ not found?", N
);
1698 Subunits_Missing
:= True;
1701 -- Load_Unit may reset Compiler_State, since it may have been
1702 -- necessary to parse an additional units, so we make sure
1703 -- that we reset it to the Analyzing state.
1705 Compiler_State
:= Analyzing
;
1707 if Unum
/= No_Unit
then
1708 if Debug_Flag_L
then
1709 Write_Str
("*** Loaded subunit from stub. Analyze");
1714 Comp_Unit
: constant Node_Id
:= Cunit
(Unum
);
1717 -- Check for child unit instead of subunit
1719 if Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1721 ("expected SEPARATE subunit, found child unit",
1722 Cunit_Entity
(Unum
));
1724 -- OK, we have a subunit
1727 -- Set corresponding stub (even if errors)
1729 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1731 -- Analyze the unit if semantics active
1733 if not Fatal_Error
(Unum
) or else Try_Semantics
then
1734 Analyze_Subunit
(Comp_Unit
);
1737 -- Set the library unit pointer in any case
1739 Set_Library_Unit
(N
, Comp_Unit
);
1741 -- We update the version. Although we are not technically
1742 -- semantically dependent on the subunit, given our
1743 -- approach of macro substitution of subunits, it makes
1744 -- sense to include it in the version identification.
1746 Version_Update
(Cunit
(Main_Unit
), Comp_Unit
);
1752 -- The remaining case is when the subunit is not already loaded and
1753 -- we are not generating code. In this case we are just performing
1754 -- semantic analysis on the parent, and we are not interested in
1755 -- the subunit. For subprograms, analyze the stub as a body. For
1756 -- other entities the stub has already been marked as completed.
1761 end Analyze_Proper_Body
;
1763 ----------------------------------
1764 -- Analyze_Protected_Body_Stub --
1765 ----------------------------------
1767 procedure Analyze_Protected_Body_Stub
(N
: Node_Id
) is
1768 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
1771 Check_Stub_Level
(N
);
1773 -- First occurrence of name may have been as an incomplete type
1775 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
1776 Nam
:= Full_View
(Nam
);
1780 or else not Is_Protected_Type
(Etype
(Nam
))
1782 Error_Msg_N
("missing specification for Protected body", N
);
1784 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1785 Set_Has_Completion
(Etype
(Nam
));
1786 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
1787 Analyze_Proper_Body
(N
, Etype
(Nam
));
1789 end Analyze_Protected_Body_Stub
;
1791 ----------------------------------
1792 -- Analyze_Subprogram_Body_Stub --
1793 ----------------------------------
1795 -- A subprogram body stub can appear with or without a previous
1796 -- specification. If there is one, the analysis of the body will
1797 -- find it and verify conformance. The formals appearing in the
1798 -- specification of the stub play no role, except for requiring an
1799 -- additional conformance check. If there is no previous subprogram
1800 -- declaration, the stub acts as a spec, and provides the defining
1801 -- entity for the subprogram.
1803 procedure Analyze_Subprogram_Body_Stub
(N
: Node_Id
) is
1807 Check_Stub_Level
(N
);
1809 -- Verify that the identifier for the stub is unique within this
1810 -- declarative part.
1812 if Nkind_In
(Parent
(N
), N_Block_Statement
,
1816 Decl
:= First
(Declarations
(Parent
(N
)));
1817 while Present
(Decl
)
1820 if Nkind
(Decl
) = N_Subprogram_Body_Stub
1821 and then (Chars
(Defining_Unit_Name
(Specification
(Decl
))) =
1822 Chars
(Defining_Unit_Name
(Specification
(N
))))
1824 Error_Msg_N
("identifier for stub is not unique", N
);
1831 -- Treat stub as a body, which checks conformance if there is a previous
1832 -- declaration, or else introduces entity and its signature.
1834 Analyze_Subprogram_Body
(N
);
1835 Analyze_Proper_Body
(N
, Empty
);
1836 end Analyze_Subprogram_Body_Stub
;
1838 ---------------------
1839 -- Analyze_Subunit --
1840 ---------------------
1842 -- A subunit is compiled either by itself (for semantic checking)
1843 -- or as part of compiling the parent (for code generation). In
1844 -- either case, by the time we actually process the subunit, the
1845 -- parent has already been installed and analyzed. The node N is
1846 -- a compilation unit, whose context needs to be treated here,
1847 -- because we come directly here from the parent without calling
1848 -- Analyze_Compilation_Unit.
1850 -- The compilation context includes the explicit context of the
1851 -- subunit, and the context of the parent, together with the parent
1852 -- itself. In order to compile the current context, we remove the
1853 -- one inherited from the parent, in order to have a clean visibility
1854 -- table. We restore the parent context before analyzing the proper
1855 -- body itself. On exit, we remove only the explicit context of the
1858 procedure Analyze_Subunit
(N
: Node_Id
) is
1859 Lib_Unit
: constant Node_Id
:= Library_Unit
(N
);
1860 Par_Unit
: constant Entity_Id
:= Current_Scope
;
1862 Lib_Spec
: Node_Id
:= Library_Unit
(Lib_Unit
);
1863 Num_Scopes
: Int
:= 0;
1864 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
1865 Enclosing_Child
: Entity_Id
:= Empty
;
1866 Svg
: constant Suppress_Array
:= Scope_Suppress
;
1868 procedure Analyze_Subunit_Context
;
1869 -- Capture names in use clauses of the subunit. This must be done
1870 -- before re-installing parent declarations, because items in the
1871 -- context must not be hidden by declarations local to the parent.
1873 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
);
1874 -- Recursive procedure to restore scope of all ancestors of subunit,
1875 -- from outermost in. If parent is not a subunit, the call to install
1876 -- context installs context of spec and (if parent is a child unit)
1877 -- the context of its parents as well. It is confusing that parents
1878 -- should be treated differently in both cases, but the semantics are
1879 -- just not identical.
1881 procedure Re_Install_Use_Clauses
;
1882 -- As part of the removal of the parent scope, the use clauses are
1883 -- removed, to be reinstalled when the context of the subunit has
1884 -- been analyzed. Use clauses may also have been affected by the
1885 -- analysis of the context of the subunit, so they have to be applied
1886 -- again, to insure that the compilation environment of the rest of
1887 -- the parent unit is identical.
1889 procedure Remove_Scope
;
1890 -- Remove current scope from scope stack, and preserve the list
1891 -- of use clauses in it, to be reinstalled after context is analyzed.
1893 -----------------------------
1894 -- Analyze_Subunit_Context --
1895 -----------------------------
1897 procedure Analyze_Subunit_Context
is
1900 Unit_Name
: Entity_Id
;
1903 Analyze_Context
(N
);
1905 -- Make withed units immediately visible. If child unit, make the
1906 -- ultimate parent immediately visible.
1908 Item
:= First
(Context_Items
(N
));
1909 while Present
(Item
) loop
1910 if Nkind
(Item
) = N_With_Clause
then
1912 -- Protect frontend against previous errors in context clauses
1914 if Nkind
(Name
(Item
)) /= N_Selected_Component
then
1915 if Error_Posted
(Item
) then
1919 Unit_Name
:= Entity
(Name
(Item
));
1920 while Is_Child_Unit
(Unit_Name
) loop
1921 Set_Is_Visible_Child_Unit
(Unit_Name
);
1922 Unit_Name
:= Scope
(Unit_Name
);
1925 if not Is_Immediately_Visible
(Unit_Name
) then
1926 Set_Is_Immediately_Visible
(Unit_Name
);
1927 Set_Context_Installed
(Item
);
1932 elsif Nkind
(Item
) = N_Use_Package_Clause
then
1933 Nam
:= First
(Names
(Item
));
1934 while Present
(Nam
) loop
1939 elsif Nkind
(Item
) = N_Use_Type_Clause
then
1940 Nam
:= First
(Subtype_Marks
(Item
));
1941 while Present
(Nam
) loop
1950 -- Reset visibility of withed units. They will be made visible
1951 -- again when we install the subunit context.
1953 Item
:= First
(Context_Items
(N
));
1954 while Present
(Item
) loop
1955 if Nkind
(Item
) = N_With_Clause
1957 -- Protect frontend against previous errors in context clauses
1959 and then Nkind
(Name
(Item
)) /= N_Selected_Component
1960 and then not Error_Posted
(Item
)
1962 Unit_Name
:= Entity
(Name
(Item
));
1963 while Is_Child_Unit
(Unit_Name
) loop
1964 Set_Is_Visible_Child_Unit
(Unit_Name
, False);
1965 Unit_Name
:= Scope
(Unit_Name
);
1968 if Context_Installed
(Item
) then
1969 Set_Is_Immediately_Visible
(Unit_Name
, False);
1970 Set_Context_Installed
(Item
, False);
1976 end Analyze_Subunit_Context
;
1978 ------------------------
1979 -- Re_Install_Parents --
1980 ------------------------
1982 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
) is
1986 if Nkind
(Unit
(L
)) = N_Subunit
then
1987 Re_Install_Parents
(Library_Unit
(L
), Scope
(Scop
));
1990 Install_Context
(L
);
1992 -- If the subunit occurs within a child unit, we must restore the
1993 -- immediate visibility of any siblings that may occur in context.
1995 if Present
(Enclosing_Child
) then
1996 Install_Siblings
(Enclosing_Child
, L
);
2001 if Scop
/= Par_Unit
then
2002 Set_Is_Immediately_Visible
(Scop
);
2005 -- Make entities in scope visible again. For child units, restore
2006 -- visibility only if they are actually in context.
2008 E
:= First_Entity
(Current_Scope
);
2009 while Present
(E
) loop
2010 if not Is_Child_Unit
(E
)
2011 or else Is_Visible_Child_Unit
(E
)
2013 Set_Is_Immediately_Visible
(E
);
2019 -- A subunit appears within a body, and for a nested subunits
2020 -- all the parents are bodies. Restore full visibility of their
2021 -- private entities.
2023 if Is_Package_Or_Generic_Package
(Scop
) then
2024 Set_In_Package_Body
(Scop
);
2025 Install_Private_Declarations
(Scop
);
2027 end Re_Install_Parents
;
2029 ----------------------------
2030 -- Re_Install_Use_Clauses --
2031 ----------------------------
2033 procedure Re_Install_Use_Clauses
is
2036 for J
in reverse 1 .. Num_Scopes
loop
2037 U
:= Use_Clauses
(J
);
2038 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:= U
;
2039 Install_Use_Clauses
(U
, Force_Installation
=> True);
2041 end Re_Install_Use_Clauses
;
2047 procedure Remove_Scope
is
2051 Num_Scopes
:= Num_Scopes
+ 1;
2052 Use_Clauses
(Num_Scopes
) :=
2053 Scope_Stack
.Table
(Scope_Stack
.Last
).First_Use_Clause
;
2055 E
:= First_Entity
(Current_Scope
);
2056 while Present
(E
) loop
2057 Set_Is_Immediately_Visible
(E
, False);
2061 if Is_Child_Unit
(Current_Scope
) then
2062 Enclosing_Child
:= Current_Scope
;
2068 -- Start of processing for Analyze_Subunit
2071 if not Is_Empty_List
(Context_Items
(N
)) then
2073 -- Save current use clauses
2076 Remove_Context
(Lib_Unit
);
2078 -- Now remove parents and their context, including enclosing
2079 -- subunits and the outer parent body which is not a subunit.
2081 if Present
(Lib_Spec
) then
2082 Remove_Context
(Lib_Spec
);
2084 while Nkind
(Unit
(Lib_Spec
)) = N_Subunit
loop
2085 Lib_Spec
:= Library_Unit
(Lib_Spec
);
2087 Remove_Context
(Lib_Spec
);
2090 if Nkind
(Unit
(Lib_Unit
)) = N_Subunit
then
2094 if Nkind
(Unit
(Lib_Spec
)) = N_Package_Body
then
2095 Remove_Context
(Library_Unit
(Lib_Spec
));
2099 Set_Is_Immediately_Visible
(Par_Unit
, False);
2101 Analyze_Subunit_Context
;
2103 Re_Install_Parents
(Lib_Unit
, Par_Unit
);
2104 Set_Is_Immediately_Visible
(Par_Unit
);
2106 -- If the context includes a child unit of the parent of the
2107 -- subunit, the parent will have been removed from visibility,
2108 -- after compiling that cousin in the context. The visibility
2109 -- of the parent must be restored now. This also applies if the
2110 -- context includes another subunit of the same parent which in
2111 -- turn includes a child unit in its context.
2113 if Is_Package_Or_Generic_Package
(Par_Unit
) then
2114 if not Is_Immediately_Visible
(Par_Unit
)
2115 or else (Present
(First_Entity
(Par_Unit
))
2116 and then not Is_Immediately_Visible
2117 (First_Entity
(Par_Unit
)))
2119 Set_Is_Immediately_Visible
(Par_Unit
);
2120 Install_Visible_Declarations
(Par_Unit
);
2121 Install_Private_Declarations
(Par_Unit
);
2125 Re_Install_Use_Clauses
;
2126 Install_Context
(N
);
2128 -- Restore state of suppress flags for current body
2130 Scope_Suppress
:= Svg
;
2132 -- If the subunit is within a child unit, then siblings of any
2133 -- parent unit that appear in the context clause of the subunit
2134 -- must also be made immediately visible.
2136 if Present
(Enclosing_Child
) then
2137 Install_Siblings
(Enclosing_Child
, N
);
2142 Analyze
(Proper_Body
(Unit
(N
)));
2145 -- The subunit may contain a with_clause on a sibling of some
2146 -- ancestor. Removing the context will remove from visibility those
2147 -- ancestor child units, which must be restored to the visibility
2148 -- they have in the enclosing body.
2150 if Present
(Enclosing_Child
) then
2156 and then Is_Child_Unit
(C
)
2158 Set_Is_Immediately_Visible
(C
);
2159 Set_Is_Visible_Child_Unit
(C
);
2164 end Analyze_Subunit
;
2166 ----------------------------
2167 -- Analyze_Task_Body_Stub --
2168 ----------------------------
2170 procedure Analyze_Task_Body_Stub
(N
: Node_Id
) is
2171 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
2172 Loc
: constant Source_Ptr
:= Sloc
(N
);
2175 Check_Stub_Level
(N
);
2177 -- First occurrence of name may have been as an incomplete type
2179 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
2180 Nam
:= Full_View
(Nam
);
2184 or else not Is_Task_Type
(Etype
(Nam
))
2186 Error_Msg_N
("missing specification for task body", N
);
2188 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
2189 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
2190 Set_Has_Completion
(Etype
(Nam
));
2191 Analyze_Proper_Body
(N
, Etype
(Nam
));
2193 -- Set elaboration flag to indicate that entity is callable.
2194 -- This cannot be done in the expansion of the body itself,
2195 -- because the proper body is not in a declarative part. This
2196 -- is only done if expansion is active, because the context
2197 -- may be generic and the flag not defined yet.
2199 if Expander_Active
then
2201 Make_Assignment_Statement
(Loc
,
2203 Make_Identifier
(Loc
,
2204 New_External_Name
(Chars
(Etype
(Nam
)), 'E')),
2205 Expression
=> New_Reference_To
(Standard_True
, Loc
)));
2209 end Analyze_Task_Body_Stub
;
2211 -------------------------
2212 -- Analyze_With_Clause --
2213 -------------------------
2215 -- Analyze the declaration of a unit in a with clause. At end,
2216 -- label the with clause with the defining entity for the unit.
2218 procedure Analyze_With_Clause
(N
: Node_Id
) is
2220 -- Retrieve the original kind of the unit node, before analysis.
2221 -- If it is a subprogram instantiation, its analysis below will
2222 -- rewrite as the declaration of the wrapper package. If the same
2223 -- instantiation appears indirectly elsewhere in the context, it
2224 -- will have been analyzed already.
2226 Unit_Kind
: constant Node_Kind
:=
2227 Nkind
(Original_Node
(Unit
(Library_Unit
(N
))));
2228 Nam
: constant Node_Id
:= Name
(N
);
2230 Par_Name
: Entity_Id
;
2235 -- Set True if the unit currently being compiled is an internal unit
2237 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
2238 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
2239 Cunit_Boolean_Restrictions_Save
;
2242 U
:= Unit
(Library_Unit
(N
));
2244 -- Several actions are skipped for dummy packages (those supplied for
2245 -- with's where no matching file could be found). Such packages are
2246 -- identified by the Sloc value being set to No_Location.
2248 if Limited_Present
(N
) then
2250 -- Ada 2005 (AI-50217): Build visibility structures but do not
2251 -- analyze the unit.
2253 if Sloc
(U
) /= No_Location
then
2254 Build_Limited_Views
(N
);
2260 -- We reset ordinary style checking during the analysis of a with'ed
2261 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2262 -- definitely *does* apply to with'ed units).
2264 if not GNAT_Mode
then
2265 Style_Check
:= False;
2268 -- If the library unit is a predefined unit, and we are in high
2269 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2270 -- for the analysis of the with'ed unit. This mode does not prevent
2271 -- explicit with'ing of run-time units.
2273 if Configurable_Run_Time_Mode
2275 Is_Predefined_File_Name
2276 (Unit_File_Name
(Get_Source_Unit
(Unit
(Library_Unit
(N
)))))
2278 Configurable_Run_Time_Mode
:= False;
2279 Semantics
(Library_Unit
(N
));
2280 Configurable_Run_Time_Mode
:= True;
2283 Semantics
(Library_Unit
(N
));
2286 Intunit
:= Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
));
2288 if Sloc
(U
) /= No_Location
then
2290 -- Check restrictions, except that we skip the check if this is an
2291 -- internal unit unless we are compiling the internal unit as the
2292 -- main unit. We also skip this for dummy packages.
2294 Check_Restriction_No_Dependence
(Nam
, N
);
2296 if not Intunit
or else Current_Sem_Unit
= Main_Unit
then
2297 Check_Restricted_Unit
(Unit_Name
(Get_Source_Unit
(U
)), N
);
2300 -- Deal with special case of GNAT.Current_Exceptions which interacts
2301 -- with the optimization of local raise statements into gotos.
2303 if Nkind
(Nam
) = N_Selected_Component
2304 and then Nkind
(Prefix
(Nam
)) = N_Identifier
2305 and then Chars
(Prefix
(Nam
)) = Name_Gnat
2306 and then (Chars
(Selector_Name
(Nam
)) = Name_Most_Recent_Exception
2308 Chars
(Selector_Name
(Nam
)) = Name_Exception_Traces
)
2310 Check_Restriction
(No_Exception_Propagation
, N
);
2311 Special_Exception_Package_Used
:= True;
2314 -- Check for inappropriate with of internal implementation unit if we
2315 -- are currently compiling the main unit and the main unit is itself
2316 -- not an internal unit. We do not issue this message for implicit
2317 -- with's generated by the compiler itself.
2319 if Implementation_Unit_Warnings
2320 and then Current_Sem_Unit
= Main_Unit
2321 and then not Intunit
2322 and then not Implicit_With
(N
)
2323 and then not GNAT_Mode
2326 U_Kind
: constant Kind_Of_Unit
:=
2327 Get_Kind_Of_Unit
(Get_Source_Unit
(U
));
2330 if U_Kind
= Implementation_Unit
then
2331 Error_Msg_F
("& is an internal 'G'N'A'T unit?", Name
(N
));
2333 ("\use of this unit is non-portable " &
2334 "and version-dependent?",
2337 elsif U_Kind
= Ada_05_Unit
2338 and then Ada_Version
< Ada_05
2339 and then Warn_On_Ada_2005_Compatibility
2341 Error_Msg_N
("& is an Ada 2005 unit?", Name
(N
));
2347 -- Semantic analysis of a generic unit is performed on a copy of
2348 -- the original tree. Retrieve the entity on which semantic info
2349 -- actually appears.
2351 if Unit_Kind
in N_Generic_Declaration
then
2352 E_Name
:= Defining_Entity
(U
);
2354 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2355 -- the case of an instantiation, semantic analysis above will have
2356 -- replaced the unit by its instantiated version. If the instance body
2357 -- has been generated, the instance now denotes the body entity. For
2358 -- visibility purposes we need the entity of its spec.
2360 elsif (Unit_Kind
= N_Package_Instantiation
2361 or else Nkind
(Original_Node
(Unit
(Library_Unit
(N
)))) =
2362 N_Package_Instantiation
)
2363 and then Nkind
(U
) = N_Package_Body
2365 E_Name
:= Corresponding_Spec
(U
);
2367 elsif Unit_Kind
= N_Package_Instantiation
2368 and then Nkind
(U
) = N_Package_Instantiation
2370 -- If the instance has not been rewritten as a package declaration,
2371 -- then it appeared already in a previous with clause. Retrieve
2372 -- the entity from the previous instance.
2374 E_Name
:= Defining_Entity
(Specification
(Instance_Spec
(U
)));
2376 elsif Unit_Kind
in N_Subprogram_Instantiation
then
2378 -- Instantiation node is replaced with a wrapper package. Retrieve
2379 -- the visible subprogram created by the instance from corresponding
2380 -- attribute of the wrapper.
2382 E_Name
:= Related_Instance
(Defining_Entity
(U
));
2384 elsif Unit_Kind
= N_Package_Renaming_Declaration
2385 or else Unit_Kind
in N_Generic_Renaming_Declaration
2387 E_Name
:= Defining_Entity
(U
);
2389 elsif Unit_Kind
= N_Subprogram_Body
2390 and then Nkind
(Name
(N
)) = N_Selected_Component
2391 and then not Acts_As_Spec
(Library_Unit
(N
))
2393 -- For a child unit that has no spec, one has been created and
2394 -- analyzed. The entity required is that of the spec.
2396 E_Name
:= Corresponding_Spec
(U
);
2399 E_Name
:= Defining_Entity
(U
);
2402 if Nkind
(Name
(N
)) = N_Selected_Component
then
2404 -- Child unit in a with clause
2406 Change_Selected_Component_To_Expanded_Name
(Name
(N
));
2409 -- Restore style checks and restrictions
2411 Style_Check
:= Save_Style_Check
;
2412 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
2414 -- Record the reference, but do NOT set the unit as referenced, we want
2415 -- to consider the unit as unreferenced if this is the only reference
2418 Set_Entity_With_Style_Check
(Name
(N
), E_Name
);
2419 Generate_Reference
(E_Name
, Name
(N
), 'w', Set_Ref
=> False);
2421 -- Generate references and check No_Dependence restriction for parents
2423 if Is_Child_Unit
(E_Name
) then
2424 Pref
:= Prefix
(Name
(N
));
2425 Par_Name
:= Scope
(E_Name
);
2426 while Nkind
(Pref
) = N_Selected_Component
loop
2427 Change_Selected_Component_To_Expanded_Name
(Pref
);
2428 Set_Entity_With_Style_Check
(Pref
, Par_Name
);
2430 Generate_Reference
(Par_Name
, Pref
);
2431 Check_Restriction_No_Dependence
(Pref
, N
);
2432 Pref
:= Prefix
(Pref
);
2434 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2435 -- is set to Standard_Standard, and no attempt should be made to
2436 -- further unwind scopes.
2438 if Par_Name
/= Standard_Standard
then
2439 Par_Name
:= Scope
(Par_Name
);
2443 if Present
(Entity
(Pref
))
2444 and then not Analyzed
(Parent
(Parent
(Entity
(Pref
))))
2446 -- If the entity is set without its unit being compiled, the
2447 -- original parent is a renaming, and Par_Name is the renamed
2448 -- entity. For visibility purposes, we need the original entity,
2449 -- which must be analyzed now because Load_Unit directly retrieves
2450 -- the renamed unit, and the renaming declaration itself has not
2453 Analyze
(Parent
(Parent
(Entity
(Pref
))));
2454 pragma Assert
(Renamed_Object
(Entity
(Pref
)) = Par_Name
);
2455 Par_Name
:= Entity
(Pref
);
2458 Set_Entity_With_Style_Check
(Pref
, Par_Name
);
2459 Generate_Reference
(Par_Name
, Pref
);
2462 -- If the withed unit is System, and a system extension pragma is
2463 -- present, compile the extension now, rather than waiting for a
2464 -- visibility check on a specific entity.
2466 if Chars
(E_Name
) = Name_System
2467 and then Scope
(E_Name
) = Standard_Standard
2468 and then Present
(System_Extend_Unit
)
2469 and then Present_System_Aux
(N
)
2471 -- If the extension is not present, an error will have been emitted
2476 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2477 -- to private_with units; they will be made visible later (just before
2478 -- the private part is analyzed)
2480 if Private_Present
(N
) then
2481 Set_Is_Immediately_Visible
(E_Name
, False);
2483 end Analyze_With_Clause
;
2485 ------------------------------
2486 -- Check_Private_Child_Unit --
2487 ------------------------------
2489 procedure Check_Private_Child_Unit
(N
: Node_Id
) is
2490 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2492 Curr_Unit
: Entity_Id
;
2493 Sub_Parent
: Node_Id
;
2494 Priv_Child
: Entity_Id
;
2495 Par_Lib
: Entity_Id
;
2498 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean;
2499 -- Returns true if and only if the library unit is declared with
2500 -- an explicit designation of private.
2502 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean is
2503 Comp_Unit
: constant Node_Id
:= Parent
(Unit_Declaration_Node
(Unit
));
2506 return Private_Present
(Comp_Unit
);
2507 end Is_Private_Library_Unit
;
2509 -- Start of processing for Check_Private_Child_Unit
2512 if Nkind_In
(Lib_Unit
, N_Package_Body
, N_Subprogram_Body
) then
2513 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(N
)));
2514 Par_Lib
:= Curr_Unit
;
2516 elsif Nkind
(Lib_Unit
) = N_Subunit
then
2518 -- The parent is itself a body. The parent entity is to be found in
2519 -- the corresponding spec.
2521 Sub_Parent
:= Library_Unit
(N
);
2522 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(Sub_Parent
)));
2524 -- If the parent itself is a subunit, Curr_Unit is the entity
2525 -- of the enclosing body, retrieve the spec entity which is
2526 -- the proper ancestor we need for the following tests.
2528 if Ekind
(Curr_Unit
) = E_Package_Body
then
2529 Curr_Unit
:= Spec_Entity
(Curr_Unit
);
2532 Par_Lib
:= Curr_Unit
;
2535 Curr_Unit
:= Defining_Entity
(Lib_Unit
);
2537 Par_Lib
:= Curr_Unit
;
2538 Par_Spec
:= Parent_Spec
(Lib_Unit
);
2540 if No
(Par_Spec
) then
2543 Par_Lib
:= Defining_Entity
(Unit
(Par_Spec
));
2547 -- Loop through context items
2549 Item
:= First
(Context_Items
(N
));
2550 while Present
(Item
) loop
2552 -- Ada 2005 (AI-262): Allow private_with of a private child package
2553 -- in public siblings
2555 if Nkind
(Item
) = N_With_Clause
2556 and then not Implicit_With
(Item
)
2557 and then not Limited_Present
(Item
)
2558 and then Is_Private_Descendant
(Entity
(Name
(Item
)))
2560 Priv_Child
:= Entity
(Name
(Item
));
2563 Curr_Parent
: Entity_Id
:= Par_Lib
;
2564 Child_Parent
: Entity_Id
:= Scope
(Priv_Child
);
2565 Prv_Ancestor
: Entity_Id
:= Child_Parent
;
2566 Curr_Private
: Boolean := Is_Private_Library_Unit
(Curr_Unit
);
2569 -- If the child unit is a public child then locate the nearest
2570 -- private ancestor. Child_Parent will then be set to the
2571 -- parent of that ancestor.
2573 if not Is_Private_Library_Unit
(Priv_Child
) then
2574 while Present
(Prv_Ancestor
)
2575 and then not Is_Private_Library_Unit
(Prv_Ancestor
)
2577 Prv_Ancestor
:= Scope
(Prv_Ancestor
);
2580 if Present
(Prv_Ancestor
) then
2581 Child_Parent
:= Scope
(Prv_Ancestor
);
2585 while Present
(Curr_Parent
)
2586 and then Curr_Parent
/= Standard_Standard
2587 and then Curr_Parent
/= Child_Parent
2590 Curr_Private
or else Is_Private_Library_Unit
(Curr_Parent
);
2591 Curr_Parent
:= Scope
(Curr_Parent
);
2594 if No
(Curr_Parent
) then
2595 Curr_Parent
:= Standard_Standard
;
2598 if Curr_Parent
/= Child_Parent
then
2599 if Ekind
(Priv_Child
) = E_Generic_Package
2600 and then Chars
(Priv_Child
) in Text_IO_Package_Name
2601 and then Chars
(Scope
(Scope
(Priv_Child
))) = Name_Ada
2604 ("& is a nested package, not a compilation unit",
2605 Name
(Item
), Priv_Child
);
2609 ("unit in with clause is private child unit!", Item
);
2611 ("\current unit must also have parent&!",
2612 Item
, Child_Parent
);
2616 or else Private_Present
(Item
)
2617 or else Nkind_In
(Lib_Unit
, N_Package_Body
, N_Subunit
)
2618 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
2619 and then not Acts_As_Spec
(Parent
(Lib_Unit
)))
2625 ("current unit must also be private descendant of&",
2626 Item
, Child_Parent
);
2634 end Check_Private_Child_Unit
;
2636 ----------------------
2637 -- Check_Stub_Level --
2638 ----------------------
2640 procedure Check_Stub_Level
(N
: Node_Id
) is
2641 Par
: constant Node_Id
:= Parent
(N
);
2642 Kind
: constant Node_Kind
:= Nkind
(Par
);
2645 if Nkind_In
(Kind
, N_Package_Body
,
2649 and then Nkind_In
(Parent
(Par
), N_Compilation_Unit
, N_Subunit
)
2653 -- In an instance, a missing stub appears at any level. A warning
2654 -- message will have been emitted already for the missing file.
2656 elsif not In_Instance
then
2657 Error_Msg_N
("stub cannot appear in an inner scope", N
);
2659 elsif Expander_Active
then
2660 Error_Msg_N
("missing proper body", N
);
2662 end Check_Stub_Level
;
2664 ------------------------
2665 -- Expand_With_Clause --
2666 ------------------------
2668 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
) is
2669 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
2670 Ent
: constant Entity_Id
:= Entity
(Nam
);
2674 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
;
2675 -- Build name to be used in implicit with_clause. In most cases this
2676 -- is the source name, but if renamings are present we must make the
2677 -- original unit visible, not the one it renames. The entity in the
2678 -- with clause is the renamed unit, but the identifier is the one from
2679 -- the source, which allows us to recover the unit renaming.
2681 ---------------------
2682 -- Build_Unit_Name --
2683 ---------------------
2685 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
is
2687 Renaming
: Entity_Id
;
2691 if Nkind
(Nam
) = N_Identifier
then
2693 -- If the parent unit P in the name of the with_clause for P.Q
2694 -- is a renaming of package R, then the entity of the parent is
2695 -- set to R, but the identifier retains Chars (P) to be consistent
2696 -- with the source (see details in lib-load). However, the
2697 -- implicit_with_clause for the parent must make the entity for
2698 -- P visible, because P.Q may be used as a prefix within the
2699 -- current unit. The entity for P is the current_entity with that
2700 -- name, because the package renaming declaration for it has just
2701 -- been analyzed. Note that this case can only happen if P.Q has
2702 -- already appeared in a previous with_clause in a related unit,
2703 -- such as the library body of the current unit.
2705 if Chars
(Nam
) /= Chars
(Entity
(Nam
)) then
2706 Renaming
:= Current_Entity
(Nam
);
2707 pragma Assert
(Renamed_Entity
(Renaming
) = Entity
(Nam
));
2708 return New_Occurrence_Of
(Renaming
, Loc
);
2711 return New_Occurrence_Of
(Entity
(Nam
), Loc
);
2715 Ent
:= Entity
(Nam
);
2717 if Present
(Entity
(Selector_Name
(Nam
)))
2718 and then Chars
(Entity
(Selector_Name
(Nam
))) /= Chars
(Ent
)
2720 Nkind
(Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
))))
2721 = N_Package_Renaming_Declaration
2723 -- The name in the with_clause is of the form A.B.C, and B
2724 -- is given by a renaming declaration. In that case we may
2725 -- not have analyzed the unit for B, but replaced it directly
2726 -- in lib-load with the unit it renames. We have to make A.B
2727 -- visible, so analyze the declaration for B now, in case it
2728 -- has not been done yet.
2730 Ent
:= Entity
(Selector_Name
(Nam
));
2733 (Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
)))));
2737 Make_Expanded_Name
(Loc
,
2738 Chars
=> Chars
(Entity
(Nam
)),
2739 Prefix
=> Build_Unit_Name
(Prefix
(Nam
)),
2740 Selector_Name
=> New_Occurrence_Of
(Ent
, Loc
));
2741 Set_Entity
(Result
, Ent
);
2744 end Build_Unit_Name
;
2746 -- Start of processing for Expand_With_Clause
2749 New_Nodes_OK
:= New_Nodes_OK
+ 1;
2751 Make_With_Clause
(Loc
,
2752 Name
=> Build_Unit_Name
(Nam
));
2754 P
:= Parent
(Unit_Declaration_Node
(Ent
));
2755 Set_Library_Unit
(Withn
, P
);
2756 Set_Corresponding_Spec
(Withn
, Ent
);
2757 Set_First_Name
(Withn
, True);
2758 Set_Implicit_With
(Withn
, True);
2760 -- If the unit is a package declaration, a private_with_clause on a
2761 -- child unit implies that the implicit with on the parent is also
2764 if Nkind
(Unit
(N
)) = N_Package_Declaration
then
2765 Set_Private_Present
(Withn
, Private_Present
(Item
));
2768 Prepend
(Withn
, Context_Items
(N
));
2769 Mark_Rewrite_Insertion
(Withn
);
2770 Install_Withed_Unit
(Withn
);
2772 if Nkind
(Nam
) = N_Expanded_Name
then
2773 Expand_With_Clause
(Item
, Prefix
(Nam
), N
);
2776 New_Nodes_OK
:= New_Nodes_OK
- 1;
2777 end Expand_With_Clause
;
2779 -----------------------
2780 -- Get_Parent_Entity --
2781 -----------------------
2783 function Get_Parent_Entity
(Unit
: Node_Id
) return Entity_Id
is
2785 if Nkind
(Unit
) = N_Package_Body
2786 and then Nkind
(Original_Node
(Unit
)) = N_Package_Instantiation
2788 return Defining_Entity
2789 (Specification
(Instance_Spec
(Original_Node
(Unit
))));
2790 elsif Nkind
(Unit
) = N_Package_Instantiation
then
2791 return Defining_Entity
(Specification
(Instance_Spec
(Unit
)));
2793 return Defining_Entity
(Unit
);
2795 end Get_Parent_Entity
;
2797 -----------------------------
2798 -- Implicit_With_On_Parent --
2799 -----------------------------
2801 procedure Implicit_With_On_Parent
2802 (Child_Unit
: Node_Id
;
2805 Loc
: constant Source_Ptr
:= Sloc
(N
);
2806 P
: constant Node_Id
:= Parent_Spec
(Child_Unit
);
2807 P_Unit
: Node_Id
:= Unit
(P
);
2808 P_Name
: constant Entity_Id
:= Get_Parent_Entity
(P_Unit
);
2811 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
;
2812 -- Build prefix of child unit name. Recurse if needed
2814 function Build_Unit_Name
return Node_Id
;
2815 -- If the unit is a child unit, build qualified name with all ancestors
2817 -------------------------
2818 -- Build_Ancestor_Name --
2819 -------------------------
2821 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
is
2822 P_Ref
: constant Node_Id
:=
2823 New_Reference_To
(Defining_Entity
(P
), Loc
);
2824 P_Spec
: Node_Id
:= P
;
2827 -- Ancestor may have been rewritten as a package body. Retrieve
2828 -- the original spec to trace earlier ancestors.
2830 if Nkind
(P
) = N_Package_Body
2831 and then Nkind
(Original_Node
(P
)) = N_Package_Instantiation
2833 P_Spec
:= Original_Node
(P
);
2836 if No
(Parent_Spec
(P_Spec
)) then
2840 Make_Selected_Component
(Loc
,
2841 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Spec
))),
2842 Selector_Name
=> P_Ref
);
2844 end Build_Ancestor_Name
;
2846 ---------------------
2847 -- Build_Unit_Name --
2848 ---------------------
2850 function Build_Unit_Name
return Node_Id
is
2853 if No
(Parent_Spec
(P_Unit
)) then
2854 return New_Reference_To
(P_Name
, Loc
);
2857 Make_Expanded_Name
(Loc
,
2858 Chars
=> Chars
(P_Name
),
2859 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Unit
))),
2860 Selector_Name
=> New_Reference_To
(P_Name
, Loc
));
2861 Set_Entity
(Result
, P_Name
);
2864 end Build_Unit_Name
;
2866 -- Start of processing for Implicit_With_On_Parent
2869 -- The unit of the current compilation may be a package body that
2870 -- replaces an instance node. In this case we need the original instance
2871 -- node to construct the proper parent name.
2873 if Nkind
(P_Unit
) = N_Package_Body
2874 and then Nkind
(Original_Node
(P_Unit
)) = N_Package_Instantiation
2876 P_Unit
:= Original_Node
(P_Unit
);
2879 -- We add the implicit with if the child unit is the current unit being
2880 -- compiled. If the current unit is a body, we do not want to add an
2881 -- implicit_with a second time to the corresponding spec.
2883 if Nkind
(Child_Unit
) = N_Package_Declaration
2884 and then Child_Unit
/= Unit
(Cunit
(Current_Sem_Unit
))
2889 New_Nodes_OK
:= New_Nodes_OK
+ 1;
2890 Withn
:= Make_With_Clause
(Loc
, Name
=> Build_Unit_Name
);
2892 Set_Library_Unit
(Withn
, P
);
2893 Set_Corresponding_Spec
(Withn
, P_Name
);
2894 Set_First_Name
(Withn
, True);
2895 Set_Implicit_With
(Withn
, True);
2897 -- Node is placed at the beginning of the context items, so that
2898 -- subsequent use clauses on the parent can be validated.
2900 Prepend
(Withn
, Context_Items
(N
));
2901 Mark_Rewrite_Insertion
(Withn
);
2902 Install_Withed_Unit
(Withn
);
2904 if Is_Child_Spec
(P_Unit
) then
2905 Implicit_With_On_Parent
(P_Unit
, N
);
2908 New_Nodes_OK
:= New_Nodes_OK
- 1;
2909 end Implicit_With_On_Parent
;
2915 function In_Chain
(E
: Entity_Id
) return Boolean is
2919 H
:= Current_Entity
(E
);
2920 while Present
(H
) loop
2931 ---------------------
2932 -- Install_Context --
2933 ---------------------
2935 procedure Install_Context
(N
: Node_Id
) is
2936 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2939 Install_Context_Clauses
(N
);
2941 if Is_Child_Spec
(Lib_Unit
) then
2942 Install_Parents
(Lib_Unit
, Private_Present
(Parent
(Lib_Unit
)));
2945 Install_Limited_Context_Clauses
(N
);
2946 end Install_Context
;
2948 -----------------------------
2949 -- Install_Context_Clauses --
2950 -----------------------------
2952 procedure Install_Context_Clauses
(N
: Node_Id
) is
2953 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2955 Uname_Node
: Entity_Id
;
2956 Check_Private
: Boolean := False;
2957 Decl_Node
: Node_Id
;
2958 Lib_Parent
: Entity_Id
;
2961 -- First skip configuration pragmas at the start of the context. They
2962 -- are not technically part of the context clause, but that's where the
2963 -- parser puts them. Note they were analyzed in Analyze_Context.
2965 Item
:= First
(Context_Items
(N
));
2966 while Present
(Item
)
2967 and then Nkind
(Item
) = N_Pragma
2968 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
2973 -- Loop through the actual context clause items. We process everything
2974 -- except Limited_With clauses in this routine. Limited_With clauses
2975 -- are separately installed (see Install_Limited_Context_Clauses).
2977 while Present
(Item
) loop
2979 -- Case of explicit WITH clause
2981 if Nkind
(Item
) = N_With_Clause
2982 and then not Implicit_With
(Item
)
2984 if Limited_Present
(Item
) then
2986 -- Limited withed units will be installed later
2990 -- If Name (Item) is not an entity name, something is wrong, and
2991 -- this will be detected in due course, for now ignore the item
2993 elsif not Is_Entity_Name
(Name
(Item
)) then
2996 elsif No
(Entity
(Name
(Item
))) then
2997 Set_Entity
(Name
(Item
), Any_Id
);
3001 Uname_Node
:= Entity
(Name
(Item
));
3003 if Is_Private_Descendant
(Uname_Node
) then
3004 Check_Private
:= True;
3007 Install_Withed_Unit
(Item
);
3009 Decl_Node
:= Unit_Declaration_Node
(Uname_Node
);
3011 -- If the unit is a subprogram instance, it appears nested within
3012 -- a package that carries the parent information.
3014 if Is_Generic_Instance
(Uname_Node
)
3015 and then Ekind
(Uname_Node
) /= E_Package
3017 Decl_Node
:= Parent
(Parent
(Decl_Node
));
3020 if Is_Child_Spec
(Decl_Node
) then
3021 if Nkind
(Name
(Item
)) = N_Expanded_Name
then
3022 Expand_With_Clause
(Item
, Prefix
(Name
(Item
)), N
);
3024 -- If not an expanded name, the child unit must be a
3025 -- renaming, nothing to do.
3030 elsif Nkind
(Decl_Node
) = N_Subprogram_Body
3031 and then not Acts_As_Spec
(Parent
(Decl_Node
))
3032 and then Is_Child_Spec
(Unit
(Library_Unit
(Parent
(Decl_Node
))))
3034 Implicit_With_On_Parent
3035 (Unit
(Library_Unit
(Parent
(Decl_Node
))), N
);
3038 -- Check license conditions unless this is a dummy unit
3040 if Sloc
(Library_Unit
(Item
)) /= No_Location
then
3041 License_Check
: declare
3043 Withu
: constant Unit_Number_Type
:=
3044 Get_Source_Unit
(Library_Unit
(Item
));
3046 Withl
: constant License_Type
:=
3047 License
(Source_Index
(Withu
));
3049 Unitl
: constant License_Type
:=
3050 License
(Source_Index
(Current_Sem_Unit
));
3052 procedure License_Error
;
3053 -- Signal error of bad license
3059 procedure License_Error
is
3062 ("?license of with'ed unit & may be inconsistent",
3066 -- Start of processing for License_Check
3069 -- Exclude license check if withed unit is an internal unit.
3070 -- This situation arises e.g. with the GPL version of GNAT.
3072 if Is_Internal_File_Name
(Unit_File_Name
(Withu
)) then
3075 -- Otherwise check various cases
3087 if Withl
= Restricted
then
3091 when Modified_GPL
=>
3092 if Withl
= Restricted
or else Withl
= GPL
then
3096 when Unrestricted
=>
3103 -- Case of USE PACKAGE clause
3105 elsif Nkind
(Item
) = N_Use_Package_Clause
then
3106 Analyze_Use_Package
(Item
);
3108 -- Case of USE TYPE clause
3110 elsif Nkind
(Item
) = N_Use_Type_Clause
then
3111 Analyze_Use_Type
(Item
);
3115 elsif Nkind
(Item
) = N_Pragma
then
3123 if Is_Child_Spec
(Lib_Unit
) then
3125 -- The unit also has implicit with_clauses on its own parents
3127 if No
(Context_Items
(N
)) then
3128 Set_Context_Items
(N
, New_List
);
3131 Implicit_With_On_Parent
(Lib_Unit
, N
);
3134 -- If the unit is a body, the context of the specification must also
3137 if Nkind
(Lib_Unit
) = N_Package_Body
3138 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
3139 and then not Acts_As_Spec
(N
))
3141 Install_Context
(Library_Unit
(N
));
3143 if Is_Child_Spec
(Unit
(Library_Unit
(N
))) then
3145 -- If the unit is the body of a public child unit, the private
3146 -- declarations of the parent must be made visible. If the child
3147 -- unit is private, the private declarations have been installed
3148 -- already in the call to Install_Parents for the spec. Installing
3149 -- private declarations must be done for all ancestors of public
3150 -- child units. In addition, sibling units mentioned in the
3151 -- context clause of the body are directly visible.
3159 Lib_Spec
:= Unit
(Library_Unit
(N
));
3160 while Is_Child_Spec
(Lib_Spec
) loop
3161 P
:= Unit
(Parent_Spec
(Lib_Spec
));
3162 P_Name
:= Defining_Entity
(P
);
3164 if not (Private_Present
(Parent
(Lib_Spec
)))
3165 and then not In_Private_Part
(P_Name
)
3167 Install_Private_Declarations
(P_Name
);
3168 Install_Private_With_Clauses
(P_Name
);
3169 Set_Use
(Private_Declarations
(Specification
(P
)));
3177 -- For a package body, children in context are immediately visible
3179 Install_Siblings
(Defining_Entity
(Unit
(Library_Unit
(N
))), N
);
3182 if Nkind_In
(Lib_Unit
, N_Generic_Package_Declaration
,
3183 N_Generic_Subprogram_Declaration
,
3184 N_Package_Declaration
,
3185 N_Subprogram_Declaration
)
3187 if Is_Child_Spec
(Lib_Unit
) then
3188 Lib_Parent
:= Defining_Entity
(Unit
(Parent_Spec
(Lib_Unit
)));
3189 Set_Is_Private_Descendant
3190 (Defining_Entity
(Lib_Unit
),
3191 Is_Private_Descendant
(Lib_Parent
)
3192 or else Private_Present
(Parent
(Lib_Unit
)));
3195 Set_Is_Private_Descendant
3196 (Defining_Entity
(Lib_Unit
),
3197 Private_Present
(Parent
(Lib_Unit
)));
3201 if Check_Private
then
3202 Check_Private_Child_Unit
(N
);
3204 end Install_Context_Clauses
;
3206 -------------------------------------
3207 -- Install_Limited_Context_Clauses --
3208 -------------------------------------
3210 procedure Install_Limited_Context_Clauses
(N
: Node_Id
) is
3213 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
);
3214 -- Check that the unlimited view of a given compilation_unit is not
3215 -- already visible through "use + renamings".
3217 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
);
3218 -- Check that if a limited_with clause of a given compilation_unit
3219 -- mentions a descendant of a private child of some library unit,
3220 -- then the given compilation_unit shall be the declaration of a
3221 -- private descendant of that library unit, or a public descendant
3222 -- of such. The code is analogous to that of Check_Private_Child_Unit
3223 -- but we cannot use entities on the limited with_clauses because
3224 -- their units have not been analyzed, so we have to climb the tree
3225 -- of ancestors looking for private keywords.
3227 procedure Expand_Limited_With_Clause
3228 (Comp_Unit
: Node_Id
;
3231 -- If a child unit appears in a limited_with clause, there are implicit
3232 -- limited_with clauses on all parents that are not already visible
3233 -- through a regular with clause. This procedure creates the implicit
3234 -- limited with_clauses for the parents and loads the corresponding
3235 -- units. The shadow entities are created when the inserted clause is
3236 -- analyzed. Implements Ada 2005 (AI-50217).
3238 ---------------------
3239 -- Check_Renamings --
3240 ---------------------
3242 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
) is
3251 pragma Assert
(Nkind
(W
) = N_With_Clause
);
3253 -- Protect the frontend against previous critical errors
3255 case Nkind
(Unit
(Library_Unit
(W
))) is
3256 when N_Subprogram_Declaration |
3257 N_Package_Declaration |
3258 N_Generic_Subprogram_Declaration |
3259 N_Generic_Package_Declaration
=>
3266 -- Check "use + renamings"
3268 WEnt
:= Defining_Unit_Name
(Specification
(Unit
(Library_Unit
(W
))));
3269 Spec
:= Specification
(Unit
(P
));
3271 Item
:= First
(Visible_Declarations
(Spec
));
3272 while Present
(Item
) loop
3274 -- Look only at use package clauses
3276 if Nkind
(Item
) = N_Use_Package_Clause
then
3278 -- Traverse the list of packages
3280 Nam
:= First
(Names
(Item
));
3281 while Present
(Nam
) loop
3284 pragma Assert
(Present
(Parent
(E
)));
3286 if Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
3287 and then Renamed_Entity
(E
) = WEnt
3289 -- The unlimited view is visible through use clause and
3290 -- renamings. There is no need to generate the error
3291 -- message here because Is_Visible_Through_Renamings
3292 -- takes care of generating the precise error message.
3296 elsif Nkind
(Parent
(E
)) = N_Package_Specification
then
3298 -- The use clause may refer to a local package.
3299 -- Check all the enclosing scopes.
3302 while E2
/= Standard_Standard
3310 ("unlimited view visible through use clause ", W
);
3322 -- Recursive call to check all the ancestors
3324 if Is_Child_Spec
(Unit
(P
)) then
3325 Check_Renamings
(P
=> Parent_Spec
(Unit
(P
)), W
=> W
);
3327 end Check_Renamings
;
3329 ---------------------------------------
3330 -- Check_Private_Limited_Withed_Unit --
3331 ---------------------------------------
3333 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
) is
3334 Curr_Parent
: Node_Id
;
3335 Child_Parent
: Node_Id
;
3336 Curr_Private
: Boolean;
3339 -- Compilation unit of the parent of the withed library unit
3341 Child_Parent
:= Library_Unit
(Item
);
3343 -- If the child unit is a public child, then locate its nearest
3344 -- private ancestor, if any; Child_Parent will then be set to
3345 -- the parent of that ancestor.
3347 if not Private_Present
(Library_Unit
(Item
)) then
3348 while Present
(Child_Parent
)
3349 and then not Private_Present
(Child_Parent
)
3351 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3354 if No
(Child_Parent
) then
3359 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3361 -- Traverse all the ancestors of the current compilation
3362 -- unit to check if it is a descendant of named library unit.
3364 Curr_Parent
:= Parent
(Item
);
3365 Curr_Private
:= Private_Present
(Curr_Parent
);
3367 while Present
(Parent_Spec
(Unit
(Curr_Parent
)))
3368 and then Curr_Parent
/= Child_Parent
3370 Curr_Parent
:= Parent_Spec
(Unit
(Curr_Parent
));
3371 Curr_Private
:= Curr_Private
or else Private_Present
(Curr_Parent
);
3374 if Curr_Parent
/= Child_Parent
then
3376 ("unit in with clause is private child unit!", Item
);
3378 ("\current unit must also have parent&!",
3379 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3381 elsif Private_Present
(Parent
(Item
))
3382 or else Curr_Private
3383 or else Private_Present
(Item
)
3384 or else Nkind_In
(Unit
(Parent
(Item
)), N_Package_Body
,
3388 -- Current unit is private, of descendant of a private unit
3394 ("current unit must also be private descendant of&",
3395 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3397 end Check_Private_Limited_Withed_Unit
;
3399 --------------------------------
3400 -- Expand_Limited_With_Clause --
3401 --------------------------------
3403 procedure Expand_Limited_With_Clause
3404 (Comp_Unit
: Node_Id
;
3408 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
3409 Unum
: Unit_Number_Type
;
3412 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean;
3413 -- Returns true if the context already includes a with_clause for
3414 -- this unit. If the with_clause is non-limited, the unit is fully
3415 -- visible and an implicit limited_with should not be created. If
3416 -- there is already a limited_with clause for W, a second one is
3417 -- simply redundant.
3419 --------------------------
3420 -- Previous_Withed_Unit --
3421 --------------------------
3423 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean is
3427 -- A limited with_clause cannot appear in the same context_clause
3428 -- as a nonlimited with_clause which mentions the same library.
3430 Item
:= First
(Context_Items
(Comp_Unit
));
3431 while Present
(Item
) loop
3432 if Nkind
(Item
) = N_With_Clause
3433 and then Library_Unit
(Item
) = Library_Unit
(W
)
3442 end Previous_Withed_Unit
;
3444 -- Start of processing for Expand_Limited_With_Clause
3447 New_Nodes_OK
:= New_Nodes_OK
+ 1;
3449 if Nkind
(Nam
) = N_Identifier
then
3451 -- Create node for name of withed unit
3454 Make_With_Clause
(Loc
,
3455 Name
=> New_Copy
(Nam
));
3457 else pragma Assert
(Nkind
(Nam
) = N_Selected_Component
);
3459 Make_With_Clause
(Loc
,
3460 Name
=> Make_Selected_Component
(Loc
,
3461 Prefix
=> New_Copy_Tree
(Prefix
(Nam
)),
3462 Selector_Name
=> New_Copy
(Selector_Name
(Nam
))));
3463 Set_Parent
(Withn
, Parent
(N
));
3466 Set_Limited_Present
(Withn
);
3467 Set_First_Name
(Withn
);
3468 Set_Implicit_With
(Withn
);
3472 (Load_Name
=> Get_Spec_Name
(Get_Unit_Name
(Nam
)),
3477 -- Do not generate a limited_with_clause on the current unit.
3478 -- This path is taken when a unit has a limited_with clause on
3479 -- one of its child units.
3481 if Unum
= Current_Sem_Unit
then
3485 Set_Library_Unit
(Withn
, Cunit
(Unum
));
3486 Set_Corresponding_Spec
3487 (Withn
, Specification
(Unit
(Cunit
(Unum
))));
3489 if not Previous_Withed_Unit
(Withn
) then
3490 Prepend
(Withn
, Context_Items
(Parent
(N
)));
3491 Mark_Rewrite_Insertion
(Withn
);
3493 -- Add implicit limited_with_clauses for parents of child units
3494 -- mentioned in limited_with clauses.
3496 if Nkind
(Nam
) = N_Selected_Component
then
3497 Expand_Limited_With_Clause
(Comp_Unit
, Prefix
(Nam
), N
);
3502 if not Limited_View_Installed
(Withn
) then
3503 Install_Limited_Withed_Unit
(Withn
);
3507 New_Nodes_OK
:= New_Nodes_OK
- 1;
3508 end Expand_Limited_With_Clause
;
3510 -- Start of processing for Install_Limited_Context_Clauses
3513 Item
:= First
(Context_Items
(N
));
3514 while Present
(Item
) loop
3515 if Nkind
(Item
) = N_With_Clause
3516 and then Limited_Present
(Item
)
3518 if Nkind
(Name
(Item
)) = N_Selected_Component
then
3519 Expand_Limited_With_Clause
3520 (Comp_Unit
=> N
, Nam
=> Prefix
(Name
(Item
)), N
=> Item
);
3523 Check_Private_Limited_Withed_Unit
(Item
);
3525 if not Implicit_With
(Item
)
3526 and then Is_Child_Spec
(Unit
(N
))
3528 Check_Renamings
(Parent_Spec
(Unit
(N
)), Item
);
3531 -- A unit may have a limited with on itself if it has a limited
3532 -- with_clause on one of its child units. In that case it is
3533 -- already being compiled and it makes no sense to install its
3536 -- If the item is a limited_private_with_clause, install it if the
3537 -- current unit is a body or if it is a private child. Otherwise
3538 -- the private clause is installed before analyzing the private
3539 -- part of the current unit.
3541 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
)
3542 and then not Limited_View_Installed
(Item
)
3544 if not Private_Present
(Item
)
3545 or else Private_Present
(N
)
3546 or else Nkind_In
(Unit
(N
), N_Package_Body
,
3550 Install_Limited_Withed_Unit
(Item
);
3554 -- All items other than Limited_With clauses are ignored (they were
3555 -- installed separately early on by Install_Context_Clause).
3564 -- Ada 2005 (AI-412): Examine the visible declarations of a package
3565 -- spec, looking for incomplete subtype declarations of incomplete
3566 -- types visible through a limited with clause.
3568 if Ada_Version
>= Ada_05
3569 and then Analyzed
(N
)
3570 and then Nkind
(Unit
(N
)) = N_Package_Declaration
3575 Non_Lim_View
: Entity_Id
;
3578 Decl
:= First
(Visible_Declarations
(Specification
(Unit
(N
))));
3579 while Present
(Decl
) loop
3580 if Nkind
(Decl
) = N_Subtype_Declaration
3582 Ekind
(Defining_Identifier
(Decl
)) = E_Incomplete_Subtype
3584 From_With_Type
(Defining_Identifier
(Decl
))
3586 Def_Id
:= Defining_Identifier
(Decl
);
3587 Non_Lim_View
:= Non_Limited_View
(Def_Id
);
3589 if not Is_Incomplete_Type
(Non_Lim_View
) then
3591 -- Convert an incomplete subtype declaration into a
3592 -- corresponding non-limited view subtype declaration.
3593 -- This is usually the case when analyzing a body that
3594 -- has regular with-clauses, when the spec has limited
3597 -- If the non-limited view is still incomplete, it is
3598 -- the dummy entry already created, and the declaration
3599 -- cannot be reanalyzed. This is the case when installing
3600 -- a parent unit that has limited with-clauses.
3602 Set_Subtype_Indication
(Decl
,
3603 New_Reference_To
(Non_Lim_View
, Sloc
(Def_Id
)));
3604 Set_Etype
(Def_Id
, Non_Lim_View
);
3605 Set_Ekind
(Def_Id
, Subtype_Kind
(Ekind
(Non_Lim_View
)));
3606 Set_Analyzed
(Decl
, False);
3608 -- Reanalyze the declaration, suppressing the call to
3609 -- Enter_Name to avoid duplicate names.
3611 Analyze_Subtype_Declaration
3621 end Install_Limited_Context_Clauses
;
3623 ---------------------
3624 -- Install_Parents --
3625 ---------------------
3627 procedure Install_Parents
(Lib_Unit
: Node_Id
; Is_Private
: Boolean) is
3634 P
:= Unit
(Parent_Spec
(Lib_Unit
));
3635 P_Name
:= Get_Parent_Entity
(P
);
3637 if Etype
(P_Name
) = Any_Type
then
3641 if Ekind
(P_Name
) = E_Generic_Package
3642 and then not Nkind_In
(Lib_Unit
, N_Generic_Subprogram_Declaration
,
3643 N_Generic_Package_Declaration
)
3644 and then Nkind
(Lib_Unit
) not in N_Generic_Renaming_Declaration
3647 ("child of a generic package must be a generic unit", Lib_Unit
);
3649 elsif not Is_Package_Or_Generic_Package
(P_Name
) then
3651 ("parent unit must be package or generic package", Lib_Unit
);
3652 raise Unrecoverable_Error
;
3654 elsif Present
(Renamed_Object
(P_Name
)) then
3655 Error_Msg_N
("parent unit cannot be a renaming", Lib_Unit
);
3656 raise Unrecoverable_Error
;
3658 -- Verify that a child of an instance is itself an instance, or the
3659 -- renaming of one. Given that an instance that is a unit is replaced
3660 -- with a package declaration, check against the original node. The
3661 -- parent may be currently being instantiated, in which case it appears
3662 -- as a declaration, but the generic_parent is already established
3663 -- indicating that we deal with an instance.
3665 elsif Nkind
(Original_Node
(P
)) = N_Package_Instantiation
then
3666 if Nkind
(Lib_Unit
) in N_Renaming_Declaration
3667 or else Nkind
(Original_Node
(Lib_Unit
)) in N_Generic_Instantiation
3669 (Nkind
(Lib_Unit
) = N_Package_Declaration
3670 and then Present
(Generic_Parent
(Specification
(Lib_Unit
))))
3675 ("child of an instance must be an instance or renaming",
3680 -- This is the recursive call that ensures all parents are loaded
3682 if Is_Child_Spec
(P
) then
3684 Is_Private
or else Private_Present
(Parent
(Lib_Unit
)));
3687 -- Now we can install the context for this parent
3689 Install_Context_Clauses
(Parent_Spec
(Lib_Unit
));
3690 Install_Limited_Context_Clauses
(Parent_Spec
(Lib_Unit
));
3691 Install_Siblings
(P_Name
, Parent
(Lib_Unit
));
3693 -- The child unit is in the declarative region of the parent. The parent
3694 -- must therefore appear in the scope stack and be visible, as when
3695 -- compiling the corresponding body. If the child unit is private or it
3696 -- is a package body, private declarations must be accessible as well.
3697 -- Use declarations in the parent must also be installed. Finally, other
3698 -- child units of the same parent that are in the context are
3699 -- immediately visible.
3701 -- Find entity for compilation unit, and set its private descendant
3702 -- status as needed.
3704 E_Name
:= Defining_Entity
(Lib_Unit
);
3706 Set_Is_Child_Unit
(E_Name
);
3708 Set_Is_Private_Descendant
(E_Name
,
3709 Is_Private_Descendant
(P_Name
)
3710 or else Private_Present
(Parent
(Lib_Unit
)));
3712 P_Spec
:= Specification
(Unit_Declaration_Node
(P_Name
));
3713 Push_Scope
(P_Name
);
3715 -- Save current visibility of unit
3717 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
:=
3718 Is_Immediately_Visible
(P_Name
);
3719 Set_Is_Immediately_Visible
(P_Name
);
3720 Install_Visible_Declarations
(P_Name
);
3721 Set_Use
(Visible_Declarations
(P_Spec
));
3723 -- If the parent is a generic unit, its formal part may contain formal
3724 -- packages and use clauses for them.
3726 if Ekind
(P_Name
) = E_Generic_Package
then
3727 Set_Use
(Generic_Formal_Declarations
(Parent
(P_Spec
)));
3731 or else Private_Present
(Parent
(Lib_Unit
))
3733 Install_Private_Declarations
(P_Name
);
3734 Install_Private_With_Clauses
(P_Name
);
3735 Set_Use
(Private_Declarations
(P_Spec
));
3737 end Install_Parents
;
3739 ----------------------------------
3740 -- Install_Private_With_Clauses --
3741 ----------------------------------
3743 procedure Install_Private_With_Clauses
(P
: Entity_Id
) is
3744 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
3748 if Debug_Flag_I
then
3749 Write_Str
("install private with clauses of ");
3750 Write_Name
(Chars
(P
));
3754 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
3755 Item
:= First
(Context_Items
(Parent
(Decl
)));
3756 while Present
(Item
) loop
3757 if Nkind
(Item
) = N_With_Clause
3758 and then Private_Present
(Item
)
3760 if Limited_Present
(Item
) then
3761 if not Limited_View_Installed
(Item
) then
3762 Install_Limited_Withed_Unit
(Item
);
3765 Install_Withed_Unit
(Item
, Private_With_OK
=> True);
3772 end Install_Private_With_Clauses
;
3774 ----------------------
3775 -- Install_Siblings --
3776 ----------------------
3778 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
) is
3784 -- Iterate over explicit with clauses, and check whether the scope of
3785 -- each entity is an ancestor of the current unit, in which case it is
3786 -- immediately visible.
3788 Item
:= First
(Context_Items
(N
));
3789 while Present
(Item
) loop
3791 -- Do not install private_with_clauses declaration, unless
3792 -- unit is itself a private child unit, or is a body.
3793 -- Note that for a subprogram body the private_with_clause does
3794 -- not take effect until after the specification.
3796 if Nkind
(Item
) /= N_With_Clause
3797 or else Implicit_With
(Item
)
3798 or else Limited_Present
(Item
)
3802 elsif not Private_Present
(Item
)
3803 or else Private_Present
(N
)
3804 or else Nkind
(Unit
(N
)) = N_Package_Body
3806 Id
:= Entity
(Name
(Item
));
3808 if Is_Child_Unit
(Id
)
3809 and then Is_Ancestor_Package
(Scope
(Id
), U_Name
)
3811 Set_Is_Immediately_Visible
(Id
);
3813 -- Check for the presence of another unit in the context,
3814 -- that may be inadvertently hidden by the child.
3816 Prev
:= Current_Entity
(Id
);
3819 and then Is_Immediately_Visible
(Prev
)
3820 and then not Is_Child_Unit
(Prev
)
3826 Clause
:= First
(Context_Items
(N
));
3827 while Present
(Clause
) loop
3828 if Nkind
(Clause
) = N_With_Clause
3829 and then Entity
(Name
(Clause
)) = Prev
3832 ("child unit& hides compilation unit " &
3833 "with the same name?",
3843 -- The With_Clause may be on a grand-child or one of its further
3844 -- descendants, which makes a child immediately visible. Examine
3845 -- ancestry to determine whether such a child exists. For example,
3846 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
3847 -- is immediately visible.
3849 elsif Is_Child_Unit
(Id
) then
3855 while Is_Child_Unit
(Par
) loop
3856 if Is_Ancestor_Package
(Scope
(Par
), U_Name
) then
3857 Set_Is_Immediately_Visible
(Par
);
3866 -- If the item is a private with-clause on a child unit, the parent
3867 -- may have been installed already, but the child unit must remain
3868 -- invisible until installed in a private part or body.
3870 elsif Private_Present
(Item
) then
3871 Id
:= Entity
(Name
(Item
));
3873 if Is_Child_Unit
(Id
) then
3874 Set_Is_Visible_Child_Unit
(Id
, False);
3880 end Install_Siblings
;
3882 ---------------------------------
3883 -- Install_Limited_Withed_Unit --
3884 ---------------------------------
3886 procedure Install_Limited_Withed_Unit
(N
: Node_Id
) is
3887 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
3890 Is_Child_Package
: Boolean := False;
3891 Lim_Header
: Entity_Id
;
3892 Lim_Typ
: Entity_Id
;
3894 procedure Check_Body_Required
;
3895 -- A unit mentioned in a limited with_clause may not be mentioned in
3896 -- a regular with_clause, but must still be included in the current
3897 -- partition. We need to determine whether the unit needs a body, so
3898 -- that the binder can determine the name of the file to be compiled.
3899 -- Checking whether a unit needs a body can be done without semantic
3900 -- analysis, by examining the nature of the declarations in the package.
3902 function Has_Limited_With_Clause
3903 (C_Unit
: Entity_Id
;
3904 Pack
: Entity_Id
) return Boolean;
3905 -- Determine whether any package in the ancestor chain starting with
3906 -- C_Unit has a limited with clause for package Pack.
3908 function Has_With_Clause
3911 Is_Limited
: Boolean := False) return Boolean;
3912 -- Determine whether compilation unit C_Unit contains a with clause
3913 -- for package Pack. Use flag Is_Limited to designate desired clause
3914 -- kind. This is a subsidiary routine to Has_Limited_With_Clause.
3916 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean;
3917 -- Check if some package installed though normal with-clauses has a
3918 -- renaming declaration of package P. AARM 10.1.2(21/2).
3920 -------------------------
3921 -- Check_Body_Required --
3922 -------------------------
3924 procedure Check_Body_Required
is
3925 PA
: constant List_Id
:=
3926 Pragmas_After
(Aux_Decls_Node
(Parent
(P_Unit
)));
3928 procedure Check_Declarations
(Spec
: Node_Id
);
3929 -- Recursive procedure that does the work and checks nested packages
3931 ------------------------
3932 -- Check_Declarations --
3933 ------------------------
3935 procedure Check_Declarations
(Spec
: Node_Id
) is
3937 Incomplete_Decls
: constant Elist_Id
:= New_Elmt_List
;
3939 Subp_List
: constant Elist_Id
:= New_Elmt_List
;
3941 procedure Check_Pragma_Import
(P
: Node_Id
);
3942 -- If a pragma import applies to a previous subprogram, the
3943 -- enclosing unit may not need a body. The processing is syntactic
3944 -- and does not require a declaration to be analyzed. The code
3945 -- below also handles pragma Import when applied to a subprogram
3946 -- that renames another. In this case the pragma applies to the
3949 -- Chains of multiple renames are not handled by the code below.
3950 -- It is probably impossible to handle all cases without proper
3951 -- name resolution. In such cases the algorithm is conservative
3952 -- and will indicate that a body is needed???
3954 -------------------------
3955 -- Check_Pragma_Import --
3956 -------------------------
3958 procedure Check_Pragma_Import
(P
: Node_Id
) is
3964 procedure Remove_Homonyms
(E
: Node_Id
);
3965 -- Make one pass over list of subprograms. Called again if
3966 -- subprogram is a renaming. E is known to be an identifier.
3968 ---------------------
3969 -- Remove_Homonyms --
3970 ---------------------
3972 procedure Remove_Homonyms
(E
: Node_Id
) is
3973 R
: Entity_Id
:= Empty
;
3974 -- Name of renamed entity, if any
3977 Subp_Id
:= First_Elmt
(Subp_List
);
3978 while Present
(Subp_Id
) loop
3979 if Chars
(Node
(Subp_Id
)) = Chars
(E
) then
3980 if Nkind
(Parent
(Parent
(Node
(Subp_Id
))))
3981 /= N_Subprogram_Renaming_Declaration
3984 Next_Elmt
(Subp_Id
);
3985 Remove_Elmt
(Subp_List
, Prev_Id
);
3987 R
:= Name
(Parent
(Parent
(Node
(Subp_Id
))));
3991 Next_Elmt
(Subp_Id
);
3996 if Nkind
(R
) = N_Identifier
then
3997 Remove_Homonyms
(R
);
3999 elsif Nkind
(R
) = N_Selected_Component
then
4000 Remove_Homonyms
(Selector_Name
(R
));
4002 -- Renaming of attribute
4008 end Remove_Homonyms
;
4010 -- Start of processing for Check_Pragma_Import
4013 -- Find name of entity in Import pragma. We have not analyzed
4014 -- the construct, so we must guard against syntax errors.
4016 Arg
:= Next
(First
(Pragma_Argument_Associations
(P
)));
4019 or else Nkind
(Expression
(Arg
)) /= N_Identifier
4023 Imported
:= Expression
(Arg
);
4026 Remove_Homonyms
(Imported
);
4027 end Check_Pragma_Import
;
4029 -- Start of processing for Check_Declarations
4032 -- Search for Elaborate Body pragma
4034 Decl
:= First
(Visible_Declarations
(Spec
));
4035 while Present
(Decl
)
4036 and then Nkind
(Decl
) = N_Pragma
4038 if Get_Pragma_Id
(Decl
) = Pragma_Elaborate_Body
then
4039 Set_Body_Required
(Library_Unit
(N
));
4046 -- Look for declarations that require the presence of a body
4048 while Present
(Decl
) loop
4050 -- Subprogram that comes from source means body may be needed.
4051 -- Save for subsequent examination of import pragmas.
4053 if Comes_From_Source
(Decl
)
4054 and then (Nkind_In
(Decl
, N_Subprogram_Declaration
,
4055 N_Subprogram_Renaming_Declaration
,
4056 N_Generic_Subprogram_Declaration
))
4058 Append_Elmt
(Defining_Entity
(Decl
), Subp_List
);
4060 -- Package declaration of generic package declaration. We need
4061 -- to recursively examine nested declarations.
4063 elsif Nkind_In
(Decl
, N_Package_Declaration
,
4064 N_Generic_Package_Declaration
)
4066 Check_Declarations
(Specification
(Decl
));
4068 elsif Nkind
(Decl
) = N_Pragma
4069 and then Pragma_Name
(Decl
) = Name_Import
4071 Check_Pragma_Import
(Decl
);
4077 -- Same set of tests for private part. In addition to subprograms
4078 -- detect the presence of Taft Amendment types (incomplete types
4079 -- completed in the body).
4081 Decl
:= First
(Private_Declarations
(Spec
));
4082 while Present
(Decl
) loop
4083 if Comes_From_Source
(Decl
)
4084 and then (Nkind_In
(Decl
, N_Subprogram_Declaration
,
4085 N_Subprogram_Renaming_Declaration
,
4086 N_Generic_Subprogram_Declaration
))
4088 Append_Elmt
(Defining_Entity
(Decl
), Subp_List
);
4090 elsif Nkind_In
(Decl
, N_Package_Declaration
,
4091 N_Generic_Package_Declaration
)
4093 Check_Declarations
(Specification
(Decl
));
4095 -- Collect incomplete type declarations for separate pass
4097 elsif Nkind
(Decl
) = N_Incomplete_Type_Declaration
then
4098 Append_Elmt
(Decl
, Incomplete_Decls
);
4100 elsif Nkind
(Decl
) = N_Pragma
4101 and then Pragma_Name
(Decl
) = Name_Import
4103 Check_Pragma_Import
(Decl
);
4109 -- Now check incomplete declarations to locate Taft amendment
4110 -- types. This can be done by examining the defining identifiers
4111 -- of type declarations without real semantic analysis.
4117 Inc
:= First_Elmt
(Incomplete_Decls
);
4118 while Present
(Inc
) loop
4119 Decl
:= Next
(Node
(Inc
));
4120 while Present
(Decl
) loop
4121 if Nkind
(Decl
) = N_Full_Type_Declaration
4122 and then Chars
(Defining_Identifier
(Decl
)) =
4123 Chars
(Defining_Identifier
(Node
(Inc
)))
4131 -- If no completion, this is a TAT, and a body is needed
4134 Set_Body_Required
(Library_Unit
(N
));
4142 -- Finally, check whether there are subprograms that still
4145 if not Is_Empty_Elmt_List
(Subp_List
) then
4150 Subp_Id
:= First_Elmt
(Subp_List
);
4152 while Present
(Subp_Id
) loop
4153 if Nkind
(Parent
(Parent
(Node
(Subp_Id
))))
4154 /= N_Subprogram_Renaming_Declaration
4156 Set_Body_Required
(Library_Unit
(N
));
4160 Next_Elmt
(Subp_Id
);
4164 end Check_Declarations
;
4166 -- Start of processing for Check_Body_Required
4169 -- If this is an imported package (Java and CIL usage) no body is
4170 -- needed. Scan list of pragmas that may follow a compilation unit
4171 -- to look for a relevant pragma Import.
4173 if Present
(PA
) then
4179 while Present
(Prag
) loop
4180 if Nkind
(Prag
) = N_Pragma
4181 and then Get_Pragma_Id
(Prag
) = Pragma_Import
4191 Check_Declarations
(Specification
(P_Unit
));
4192 end Check_Body_Required
;
4194 -----------------------------
4195 -- Has_Limited_With_Clause --
4196 -----------------------------
4198 function Has_Limited_With_Clause
4199 (C_Unit
: Entity_Id
;
4200 Pack
: Entity_Id
) return Boolean
4207 while Present
(Par
) loop
4208 if Ekind
(Par
) /= E_Package
then
4212 -- Retrieve the Compilation_Unit node for Par and determine if
4213 -- its context clauses contain a limited with for Pack.
4215 Par_Unit
:= Parent
(Parent
(Parent
(Par
)));
4217 if Nkind
(Par_Unit
) = N_Package_Declaration
then
4218 Par_Unit
:= Parent
(Par_Unit
);
4221 if Has_With_Clause
(Par_Unit
, Pack
, True) then
4225 -- If there are more ancestors, climb up the tree, otherwise
4228 if Is_Child_Unit
(Par
) then
4236 end Has_Limited_With_Clause
;
4238 ---------------------
4239 -- Has_With_Clause --
4240 ---------------------
4242 function Has_With_Clause
4245 Is_Limited
: Boolean := False) return Boolean
4251 if Present
(Context_Items
(C_Unit
)) then
4252 Item
:= First
(Context_Items
(C_Unit
));
4253 while Present
(Item
) loop
4254 if Nkind
(Item
) = N_With_Clause
then
4256 -- Retrieve the entity of the imported compilation unit
4258 if Nkind
(Name
(Item
)) = N_Selected_Component
then
4259 Nam
:= Entity
(Selector_Name
(Name
(Item
)));
4261 Nam
:= Entity
(Name
(Item
));
4266 ((Is_Limited
and then Limited_Present
(Item
))
4268 (not Is_Limited
and then not Limited_Present
(Item
)))
4279 end Has_With_Clause
;
4281 ----------------------------------
4282 -- Is_Visible_Through_Renamings --
4283 ----------------------------------
4285 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean is
4286 Kind
: constant Node_Kind
:=
4287 Nkind
(Unit
(Cunit
(Current_Sem_Unit
)));
4293 -- Example of the error detected by this subprogram:
4301 -- package Ren_P renames P;
4307 -- limited with P; -- ERROR
4308 -- package R.C is ...
4310 Aux_Unit
:= Cunit
(Current_Sem_Unit
);
4313 Item
:= First
(Context_Items
(Aux_Unit
));
4314 while Present
(Item
) loop
4315 if Nkind
(Item
) = N_With_Clause
4316 and then not Limited_Present
(Item
)
4317 and then Nkind
(Unit
(Library_Unit
(Item
))) =
4318 N_Package_Declaration
4321 First
(Visible_Declarations
4322 (Specification
(Unit
(Library_Unit
(Item
)))));
4323 while Present
(Decl
) loop
4324 if Nkind
(Decl
) = N_Package_Renaming_Declaration
4325 and then Entity
(Name
(Decl
)) = P
4327 -- Generate the error message only if the current unit
4328 -- is a package declaration; in case of subprogram
4329 -- bodies and package bodies we just return True to
4330 -- indicate that the limited view must not be
4333 if Kind
= N_Package_Declaration
then
4335 ("simultaneous visibility of the limited and " &
4336 "unlimited views not allowed", N
);
4337 Error_Msg_Sloc
:= Sloc
(Item
);
4339 ("\\ unlimited view of & visible through the " &
4340 "context clause #", N
, P
);
4341 Error_Msg_Sloc
:= Sloc
(Decl
);
4342 Error_Msg_NE
("\\ and the renaming #", N
, P
);
4355 -- If it's a body not acting as spec, follow pointer to
4356 -- corresponding spec, otherwise follow pointer to parent spec.
4358 if Present
(Library_Unit
(Aux_Unit
))
4359 and then Nkind_In
(Unit
(Aux_Unit
),
4360 N_Package_Body
, N_Subprogram_Body
)
4362 if Aux_Unit
= Library_Unit
(Aux_Unit
) then
4364 -- Aux_Unit is a body that acts as a spec. Clause has
4365 -- already been flagged as illegal.
4370 Aux_Unit
:= Library_Unit
(Aux_Unit
);
4374 Aux_Unit
:= Parent_Spec
(Unit
(Aux_Unit
));
4377 exit when No
(Aux_Unit
);
4381 end Is_Visible_Through_Renamings
;
4383 -- Start of processing for Install_Limited_Withed_Unit
4386 pragma Assert
(not Limited_View_Installed
(N
));
4388 -- In case of limited with_clause on subprograms, generics, instances,
4389 -- or renamings, the corresponding error was previously posted and we
4390 -- have nothing to do here. If the file is missing altogether, it has
4391 -- no source location.
4393 if Nkind
(P_Unit
) /= N_Package_Declaration
4394 or else Sloc
(P_Unit
) = No_Location
4399 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
4401 -- Handle child packages
4403 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
4404 Is_Child_Package
:= True;
4405 P
:= Defining_Identifier
(P
);
4408 -- Do not install the limited-view if the full-view is already visible
4409 -- through renaming declarations.
4411 if Is_Visible_Through_Renamings
(P
) then
4415 -- Do not install the limited view if this is the unit being analyzed.
4416 -- This unusual case will happen when a unit has a limited_with clause
4417 -- on one of its children. The compilation of the child forces the
4418 -- load of the parent which tries to install the limited view of the
4419 -- child again. Installing the limited view must also be disabled
4420 -- when compiling the body of the child unit.
4422 if P
= Cunit_Entity
(Current_Sem_Unit
)
4424 (Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4425 and then P
= Main_Unit_Entity
)
4430 -- This scenario is similar to the one above, the difference is that
4431 -- the compilation of sibling Par.Sib forces the load of parent Par
4432 -- which tries to install the limited view of Lim_Pack [1]. However
4433 -- Par.Sib has a with clause for Lim_Pack [2] in its body, and thus
4434 -- needs the non-limited views of all entities from Lim_Pack.
4436 -- limited with Lim_Pack; -- [1]
4437 -- package Par is ... package Lim_Pack is ...
4439 -- with Lim_Pack; -- [2]
4440 -- package Par.Sib is ... package body Par.Sib is ...
4442 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4443 -- Sem_Unit is the body of Par.Sib.
4445 if Ekind
(P
) = E_Package
4446 and then Ekind
(Main_Unit_Entity
) = E_Package
4447 and then Is_Child_Unit
(Main_Unit_Entity
)
4449 -- The body has a regular with clause
4451 and then Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4452 and then Has_With_Clause
(Cunit
(Current_Sem_Unit
), P
)
4454 -- One of the ancestors has a limited with clause
4456 and then Nkind
(Parent
(Parent
(Main_Unit_Entity
))) =
4457 N_Package_Specification
4458 and then Has_Limited_With_Clause
(Scope
(Main_Unit_Entity
), P
)
4463 -- A common use of the limited-with is to have a limited-with
4464 -- in the package spec, and a normal with in its package body.
4467 -- limited with X; -- [1]
4471 -- package body A is ...
4473 -- The compilation of A's body installs the context clauses found at [2]
4474 -- and then the context clauses of its specification (found at [1]). As
4475 -- a consequence, at [1] the specification of X has been analyzed and it
4476 -- is immediately visible. According to the semantics of limited-with
4477 -- context clauses we don't install the limited view because the full
4478 -- view of X supersedes its limited view.
4480 if Analyzed
(P_Unit
)
4482 (Is_Immediately_Visible
(P
)
4484 (Is_Child_Package
and then Is_Visible_Child_Unit
(P
)))
4489 if Debug_Flag_I
then
4490 Write_Str
("install limited view of ");
4491 Write_Name
(Chars
(P
));
4495 -- If the unit has not been analyzed and the limited view has not been
4496 -- already installed then we install it.
4498 if not Analyzed
(P_Unit
) then
4499 if not In_Chain
(P
) then
4501 -- Minimum decoration
4503 Set_Ekind
(P
, E_Package
);
4504 Set_Etype
(P
, Standard_Void_Type
);
4505 Set_Scope
(P
, Standard_Standard
);
4507 if Is_Child_Package
then
4508 Set_Is_Child_Unit
(P
);
4509 Set_Is_Visible_Child_Unit
(P
);
4510 Set_Scope
(P
, Defining_Entity
(Unit
(Parent_Spec
(P_Unit
))));
4513 -- Place entity on visibility structure
4515 Set_Homonym
(P
, Current_Entity
(P
));
4516 Set_Current_Entity
(P
);
4518 if Debug_Flag_I
then
4519 Write_Str
(" (homonym) chain ");
4520 Write_Name
(Chars
(P
));
4524 -- Install the incomplete view. The first element of the limited
4525 -- view is a header (an E_Package entity) used to reference the
4526 -- first shadow entity in the private part of the package.
4528 Lim_Header
:= Limited_View
(P
);
4529 Lim_Typ
:= First_Entity
(Lim_Header
);
4531 while Present
(Lim_Typ
)
4532 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
4534 Set_Homonym
(Lim_Typ
, Current_Entity
(Lim_Typ
));
4535 Set_Current_Entity
(Lim_Typ
);
4537 if Debug_Flag_I
then
4538 Write_Str
(" (homonym) chain ");
4539 Write_Name
(Chars
(Lim_Typ
));
4543 Next_Entity
(Lim_Typ
);
4547 -- If the unit appears in a previous regular with_clause, the regular
4548 -- entities of the public part of the withed package must be replaced
4549 -- by the shadow ones.
4551 -- This code must be kept synchronized with the code that replaces the
4552 -- shadow entities by the real entities (see body of Remove_Limited
4553 -- With_Clause); otherwise the contents of the homonym chains are not
4557 -- Hide all the type entities of the public part of the package to
4558 -- avoid its usage. This is needed to cover all the subtype decla-
4559 -- rations because we do not remove them from the homonym chain.
4561 E
:= First_Entity
(P
);
4562 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
4564 Set_Was_Hidden
(E
, Is_Hidden
(E
));
4571 -- Replace the real entities by the shadow entities of the limited
4572 -- view. The first element of the limited view is a header that is
4573 -- used to reference the first shadow entity in the private part
4574 -- of the package. Successive elements are the limited views of the
4575 -- type (including regular incomplete types) declared in the package.
4577 Lim_Header
:= Limited_View
(P
);
4579 Lim_Typ
:= First_Entity
(Lim_Header
);
4580 while Present
(Lim_Typ
)
4581 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
4583 pragma Assert
(not In_Chain
(Lim_Typ
));
4585 -- Do not unchain nested packages and child units
4587 if Ekind
(Lim_Typ
) /= E_Package
4588 and then not Is_Child_Unit
(Lim_Typ
)
4594 Prev
:= Current_Entity
(Lim_Typ
);
4597 -- Replace E in the homonyms list, so that the limited
4598 -- view becomes available.
4600 if E
= Non_Limited_View
(Lim_Typ
) then
4601 Set_Homonym
(Lim_Typ
, Homonym
(Prev
));
4602 Set_Current_Entity
(Lim_Typ
);
4606 E
:= Homonym
(Prev
);
4608 -- E may have been removed when installing a
4609 -- previous limited_with_clause.
4613 exit when E
= Non_Limited_View
(Lim_Typ
);
4615 Prev
:= Homonym
(Prev
);
4619 Set_Homonym
(Lim_Typ
, Homonym
(Homonym
(Prev
)));
4620 Set_Homonym
(Prev
, Lim_Typ
);
4625 if Debug_Flag_I
then
4626 Write_Str
(" (homonym) chain ");
4627 Write_Name
(Chars
(Lim_Typ
));
4632 Next_Entity
(Lim_Typ
);
4636 -- The package must be visible while the limited-with clause is active
4637 -- because references to the type P.T must resolve in the usual way.
4638 -- In addition, we remember that the limited-view has been installed to
4639 -- uninstall it at the point of context removal.
4641 Set_Is_Immediately_Visible
(P
);
4642 Set_Limited_View_Installed
(N
);
4644 -- If unit has not been analyzed in some previous context, check
4645 -- (imperfectly ???) whether it might need a body.
4647 if not Analyzed
(P_Unit
) then
4648 Check_Body_Required
;
4651 -- If the package in the limited_with clause is a child unit, the
4652 -- clause is unanalyzed and appears as a selected component. Recast
4653 -- it as an expanded name so that the entity can be properly set. Use
4654 -- entity of parent, if available, for higher ancestors in the name.
4656 if Nkind
(Name
(N
)) = N_Selected_Component
then
4664 while Nkind
(Nam
) = N_Selected_Component
4665 and then Present
(Ent
)
4667 Change_Selected_Component_To_Expanded_Name
(Nam
);
4669 -- Set entity of parent identifiers if the unit is a child
4670 -- unit. This ensures that the tree is properly formed from
4671 -- semantic point of view (e.g. for ASIS queries).
4673 Set_Entity
(Nam
, Ent
);
4675 Nam
:= Prefix
(Nam
);
4678 -- Set entity of last ancestor
4680 if Nkind
(Nam
) = N_Identifier
then
4681 Set_Entity
(Nam
, Ent
);
4687 Set_Entity
(Name
(N
), P
);
4688 Set_From_With_Type
(P
);
4689 end Install_Limited_Withed_Unit
;
4691 -------------------------
4692 -- Install_Withed_Unit --
4693 -------------------------
4695 procedure Install_Withed_Unit
4696 (With_Clause
: Node_Id
;
4697 Private_With_OK
: Boolean := False)
4699 Uname
: constant Entity_Id
:= Entity
(Name
(With_Clause
));
4700 P
: constant Entity_Id
:= Scope
(Uname
);
4703 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4704 -- compiling a package declaration and the Private_With_OK flag was not
4705 -- set by the caller. These declarations will be installed later (before
4706 -- analyzing the private part of the package).
4708 if Private_Present
(With_Clause
)
4709 and then Nkind
(Unit
(Parent
(With_Clause
))) = N_Package_Declaration
4710 and then not (Private_With_OK
)
4715 if Debug_Flag_I
then
4716 if Private_Present
(With_Clause
) then
4717 Write_Str
("install private withed unit ");
4719 Write_Str
("install withed unit ");
4722 Write_Name
(Chars
(Uname
));
4726 -- We do not apply the restrictions to an internal unit unless
4727 -- we are compiling the internal unit as a main unit. This check
4728 -- is also skipped for dummy units (for missing packages).
4730 if Sloc
(Uname
) /= No_Location
4731 and then (not Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
))
4732 or else Current_Sem_Unit
= Main_Unit
)
4734 Check_Restricted_Unit
4735 (Unit_Name
(Get_Source_Unit
(Uname
)), With_Clause
);
4738 if P
/= Standard_Standard
then
4740 -- If the unit is not analyzed after analysis of the with clause and
4741 -- it is an instantiation then it awaits a body and is the main unit.
4742 -- Its appearance in the context of some other unit indicates a
4743 -- circular dependency (DEC suite perversity).
4745 if not Analyzed
(Uname
)
4746 and then Nkind
(Parent
(Uname
)) = N_Package_Instantiation
4749 ("instantiation depends on itself", Name
(With_Clause
));
4751 elsif not Is_Visible_Child_Unit
(Uname
) then
4752 Set_Is_Visible_Child_Unit
(Uname
);
4754 -- If the child unit appears in the context of its parent, it is
4755 -- immediately visible.
4757 if In_Open_Scopes
(Scope
(Uname
)) then
4758 Set_Is_Immediately_Visible
(Uname
);
4761 if Is_Generic_Instance
(Uname
)
4762 and then Ekind
(Uname
) in Subprogram_Kind
4764 -- Set flag as well on the visible entity that denotes the
4765 -- instance, which renames the current one.
4767 Set_Is_Visible_Child_Unit
4769 (Defining_Entity
(Unit
(Library_Unit
(With_Clause
)))));
4772 -- The parent unit may have been installed already, and may have
4773 -- appeared in a use clause.
4775 if In_Use
(Scope
(Uname
)) then
4776 Set_Is_Potentially_Use_Visible
(Uname
);
4779 Set_Context_Installed
(With_Clause
);
4782 elsif not Is_Immediately_Visible
(Uname
) then
4783 if not Private_Present
(With_Clause
)
4784 or else Private_With_OK
4786 Set_Is_Immediately_Visible
(Uname
);
4789 Set_Context_Installed
(With_Clause
);
4792 -- A with-clause overrides a with-type clause: there are no restric-
4793 -- tions on the use of package entities.
4795 if Ekind
(Uname
) = E_Package
then
4796 Set_From_With_Type
(Uname
, False);
4799 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
4800 -- unit if there is a visible homograph for it declared in the same
4801 -- declarative region. This pathological case can only arise when an
4802 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
4803 -- G1 has a generic child also named G2, and the context includes with_
4804 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
4805 -- of I1.G2 visible as well. If the child unit is named Standard, do
4806 -- not apply the check to the Standard package itself.
4808 if Is_Child_Unit
(Uname
)
4809 and then Is_Visible_Child_Unit
(Uname
)
4810 and then Ada_Version
>= Ada_05
4813 Decl1
: constant Node_Id
:= Unit_Declaration_Node
(P
);
4819 U2
:= Homonym
(Uname
);
4821 and then U2
/= Standard_Standard
4824 Decl2
:= Unit_Declaration_Node
(P2
);
4826 if Is_Child_Unit
(U2
)
4827 and then Is_Visible_Child_Unit
(U2
)
4829 if Is_Generic_Instance
(P
)
4830 and then Nkind
(Decl1
) = N_Package_Declaration
4831 and then Generic_Parent
(Specification
(Decl1
)) = P2
4833 Error_Msg_N
("illegal with_clause", With_Clause
);
4835 ("\child unit has visible homograph" &
4836 " (RM 8.3(26), 10.1.1(19))",
4840 elsif Is_Generic_Instance
(P2
)
4841 and then Nkind
(Decl2
) = N_Package_Declaration
4842 and then Generic_Parent
(Specification
(Decl2
)) = P
4844 -- With_clause for child unit of instance appears before
4845 -- in the context. We want to place the error message on
4846 -- it, not on the generic child unit itself.
4849 Prev_Clause
: Node_Id
;
4852 Prev_Clause
:= First
(List_Containing
(With_Clause
));
4853 while Entity
(Name
(Prev_Clause
)) /= U2
loop
4857 pragma Assert
(Present
(Prev_Clause
));
4858 Error_Msg_N
("illegal with_clause", Prev_Clause
);
4860 ("\child unit has visible homograph" &
4861 " (RM 8.3(26), 10.1.1(19))",
4872 end Install_Withed_Unit
;
4878 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean is
4879 K
: constant Node_Kind
:= Nkind
(Lib_Unit
);
4882 return (K
in N_Generic_Declaration
or else
4883 K
in N_Generic_Instantiation
or else
4884 K
in N_Generic_Renaming_Declaration
or else
4885 K
= N_Package_Declaration
or else
4886 K
= N_Package_Renaming_Declaration
or else
4887 K
= N_Subprogram_Declaration
or else
4888 K
= N_Subprogram_Renaming_Declaration
)
4889 and then Present
(Parent_Spec
(Lib_Unit
));
4892 -----------------------
4893 -- Load_Needed_Body --
4894 -----------------------
4896 -- N is a generic unit named in a with clause, or else it is a unit that
4897 -- contains a generic unit or an inlined function. In order to perform an
4898 -- instantiation, the body of the unit must be present. If the unit itself
4899 -- is generic, we assume that an instantiation follows, and load & analyze
4900 -- the body unconditionally. This forces analysis of the spec as well.
4902 -- If the unit is not generic, but contains a generic unit, it is loaded on
4903 -- demand, at the point of instantiation (see ch12).
4905 procedure Load_Needed_Body
(N
: Node_Id
; OK
: out Boolean) is
4906 Body_Name
: Unit_Name_Type
;
4907 Unum
: Unit_Number_Type
;
4909 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
4910 -- The loading and analysis is done with style checks off
4913 if not GNAT_Mode
then
4914 Style_Check
:= False;
4917 Body_Name
:= Get_Body_Name
(Get_Unit_Name
(Unit
(N
)));
4920 (Load_Name
=> Body_Name
,
4926 if Unum
= No_Unit
then
4930 Compiler_State
:= Analyzing
; -- reset after load
4932 if not Fatal_Error
(Unum
) or else Try_Semantics
then
4933 if Debug_Flag_L
then
4934 Write_Str
("*** Loaded generic body");
4938 Semantics
(Cunit
(Unum
));
4944 Style_Check
:= Save_Style_Check
;
4945 end Load_Needed_Body
;
4947 -------------------------
4948 -- Build_Limited_Views --
4949 -------------------------
4951 procedure Build_Limited_Views
(N
: Node_Id
) is
4952 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Library_Unit
(N
));
4953 P
: constant Entity_Id
:= Cunit_Entity
(Unum
);
4955 Spec
: Node_Id
; -- To denote a package specification
4956 Lim_Typ
: Entity_Id
; -- To denote shadow entities
4957 Comp_Typ
: Entity_Id
; -- To denote real entities
4959 Lim_Header
: Entity_Id
; -- Package entity
4960 Last_Lim_E
: Entity_Id
:= Empty
; -- Last limited entity built
4961 Last_Pub_Lim_E
: Entity_Id
; -- To set the first private entity
4963 procedure Decorate_Incomplete_Type
4966 -- Add attributes of an incomplete type to a shadow entity. The same
4967 -- attributes are placed on the real entity, so that gigi receives
4968 -- a consistent view.
4970 procedure Decorate_Package_Specification
(P
: Entity_Id
);
4971 -- Add attributes of a package entity to the entity in a package
4974 procedure Decorate_Tagged_Type
4978 -- Set basic attributes of tagged type T, including its class_wide type.
4979 -- The parameters Loc, Scope are used to decorate the class_wide type.
4981 procedure Build_Chain
4983 First_Decl
: Node_Id
);
4984 -- Construct list of shadow entities and attach it to entity of
4985 -- package that is mentioned in a limited_with clause.
4987 function New_Internal_Shadow_Entity
4988 (Kind
: Entity_Kind
;
4989 Sloc_Value
: Source_Ptr
;
4990 Id_Char
: Character) return Entity_Id
;
4991 -- Build a new internal entity and append it to the list of shadow
4992 -- entities available through the limited-header
4994 ------------------------------
4995 -- Decorate_Incomplete_Type --
4996 ------------------------------
4998 procedure Decorate_Incomplete_Type
5003 Set_Ekind
(E
, E_Incomplete_Type
);
5004 Set_Scope
(E
, Scop
);
5006 Set_Is_First_Subtype
(E
, True);
5007 Set_Stored_Constraint
(E
, No_Elist
);
5008 Set_Full_View
(E
, Empty
);
5009 Init_Size_Align
(E
);
5010 end Decorate_Incomplete_Type
;
5012 --------------------------
5013 -- Decorate_Tagged_Type --
5014 --------------------------
5016 procedure Decorate_Tagged_Type
5024 Decorate_Incomplete_Type
(T
, Scop
);
5025 Set_Is_Tagged_Type
(T
);
5027 -- Build corresponding class_wide type, if not previously done
5029 -- Note: The class-wide entity is shared by the limited-view
5030 -- and the full-view.
5032 if No
(Class_Wide_Type
(T
)) then
5033 CW
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('S'));
5035 -- Set parent to be the same as the parent of the tagged type.
5036 -- We need a parent field set, and it is supposed to point to
5037 -- the declaration of the type. The tagged type declaration
5038 -- essentially declares two separate types, the tagged type
5039 -- itself and the corresponding class-wide type, so it is
5040 -- reasonable for the parent fields to point to the declaration
5043 Set_Parent
(CW
, Parent
(T
));
5045 -- Set remaining fields of classwide type
5047 Set_Ekind
(CW
, E_Class_Wide_Type
);
5049 Set_Scope
(CW
, Scop
);
5050 Set_Is_Tagged_Type
(CW
);
5051 Set_Is_First_Subtype
(CW
, True);
5052 Init_Size_Align
(CW
);
5053 Set_Has_Unknown_Discriminants
(CW
, True);
5054 Set_Class_Wide_Type
(CW
, CW
);
5055 Set_Equivalent_Type
(CW
, Empty
);
5056 Set_From_With_Type
(CW
, From_With_Type
(T
));
5058 -- Link type to its class-wide type
5060 Set_Class_Wide_Type
(T
, CW
);
5062 end Decorate_Tagged_Type
;
5064 ------------------------------------
5065 -- Decorate_Package_Specification --
5066 ------------------------------------
5068 procedure Decorate_Package_Specification
(P
: Entity_Id
) is
5070 -- Place only the most basic attributes
5072 Set_Ekind
(P
, E_Package
);
5073 Set_Etype
(P
, Standard_Void_Type
);
5074 end Decorate_Package_Specification
;
5076 --------------------------------
5077 -- New_Internal_Shadow_Entity --
5078 --------------------------------
5080 function New_Internal_Shadow_Entity
5081 (Kind
: Entity_Kind
;
5082 Sloc_Value
: Source_Ptr
;
5083 Id_Char
: Character) return Entity_Id
5085 E
: constant Entity_Id
:=
5086 Make_Defining_Identifier
(Sloc_Value
,
5087 Chars
=> New_Internal_Name
(Id_Char
));
5090 Set_Ekind
(E
, Kind
);
5091 Set_Is_Internal
(E
, True);
5093 if Kind
in Type_Kind
then
5094 Init_Size_Align
(E
);
5097 Append_Entity
(E
, Lim_Header
);
5100 end New_Internal_Shadow_Entity
;
5106 procedure Build_Chain
5108 First_Decl
: Node_Id
)
5110 Analyzed_Unit
: constant Boolean := Analyzed
(Cunit
(Unum
));
5111 Is_Tagged
: Boolean;
5116 while Present
(Decl
) loop
5118 -- For each library_package_declaration in the environment, there
5119 -- is an implicit declaration of a *limited view* of that library
5120 -- package. The limited view of a package contains:
5122 -- * For each nested package_declaration, a declaration of the
5123 -- limited view of that package, with the same defining-
5124 -- program-unit name.
5126 -- * For each type_declaration in the visible part, an incomplete
5127 -- type-declaration with the same defining_identifier, whose
5128 -- completion is the type_declaration. If the type_declaration
5129 -- is tagged, then the incomplete_type_declaration is tagged
5132 -- The partial view is tagged if the declaration has the
5133 -- explicit keyword, or else if it is a type extension, both
5134 -- of which can be ascertained syntactically.
5136 if Nkind
(Decl
) = N_Full_Type_Declaration
then
5138 (Nkind
(Type_Definition
(Decl
)) = N_Record_Definition
5139 and then Tagged_Present
(Type_Definition
(Decl
)))
5141 (Nkind
(Type_Definition
(Decl
)) = N_Derived_Type_Definition
5144 (Record_Extension_Part
(Type_Definition
(Decl
))));
5146 Comp_Typ
:= Defining_Identifier
(Decl
);
5148 if not Analyzed_Unit
then
5150 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5152 Decorate_Incomplete_Type
(Comp_Typ
, Scope
);
5156 -- Create shadow entity for type
5158 Lim_Typ
:= New_Internal_Shadow_Entity
5159 (Kind
=> Ekind
(Comp_Typ
),
5160 Sloc_Value
=> Sloc
(Comp_Typ
),
5163 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5164 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5165 Set_From_With_Type
(Lim_Typ
);
5168 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5170 Decorate_Incomplete_Type
(Lim_Typ
, Scope
);
5173 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5175 elsif Nkind_In
(Decl
, N_Private_Type_Declaration
,
5176 N_Incomplete_Type_Declaration
,
5177 N_Task_Type_Declaration
,
5178 N_Protected_Type_Declaration
)
5180 Comp_Typ
:= Defining_Identifier
(Decl
);
5183 Nkind_In
(Decl
, N_Private_Type_Declaration
,
5184 N_Incomplete_Type_Declaration
)
5185 and then Tagged_Present
(Decl
);
5187 if not Analyzed_Unit
then
5189 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5191 Decorate_Incomplete_Type
(Comp_Typ
, Scope
);
5195 Lim_Typ
:= New_Internal_Shadow_Entity
5196 (Kind
=> Ekind
(Comp_Typ
),
5197 Sloc_Value
=> Sloc
(Comp_Typ
),
5200 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5201 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5202 Set_From_With_Type
(Lim_Typ
);
5205 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5207 Decorate_Incomplete_Type
(Lim_Typ
, Scope
);
5210 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5212 elsif Nkind
(Decl
) = N_Private_Extension_Declaration
then
5213 Comp_Typ
:= Defining_Identifier
(Decl
);
5215 if not Analyzed_Unit
then
5216 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5219 -- Create shadow entity for type
5221 Lim_Typ
:= New_Internal_Shadow_Entity
5222 (Kind
=> Ekind
(Comp_Typ
),
5223 Sloc_Value
=> Sloc
(Comp_Typ
),
5226 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5227 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5228 Set_From_With_Type
(Lim_Typ
);
5230 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5231 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5233 elsif Nkind
(Decl
) = N_Package_Declaration
then
5238 Spec
: constant Node_Id
:= Specification
(Decl
);
5241 Comp_Typ
:= Defining_Unit_Name
(Spec
);
5243 if not Analyzed
(Cunit
(Unum
)) then
5244 Decorate_Package_Specification
(Comp_Typ
);
5245 Set_Scope
(Comp_Typ
, Scope
);
5248 Lim_Typ
:= New_Internal_Shadow_Entity
5249 (Kind
=> Ekind
(Comp_Typ
),
5250 Sloc_Value
=> Sloc
(Comp_Typ
),
5253 Decorate_Package_Specification
(Lim_Typ
);
5254 Set_Scope
(Lim_Typ
, Scope
);
5256 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5257 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5258 Set_From_With_Type
(Lim_Typ
);
5260 -- Note: The non_limited_view attribute is not used
5261 -- for local packages.
5265 First_Decl
=> First
(Visible_Declarations
(Spec
)));
5273 -- Start of processing for Build_Limited_Views
5276 pragma Assert
(Limited_Present
(N
));
5278 -- A library_item mentioned in a limited_with_clause is a package
5279 -- declaration, not a subprogram declaration, generic declaration,
5280 -- generic instantiation, or package renaming declaration.
5282 case Nkind
(Unit
(Library_Unit
(N
))) is
5283 when N_Package_Declaration
=>
5286 when N_Subprogram_Declaration
=>
5287 Error_Msg_N
("subprograms not allowed in "
5288 & "limited with_clauses", N
);
5291 when N_Generic_Package_Declaration |
5292 N_Generic_Subprogram_Declaration
=>
5293 Error_Msg_N
("generics not allowed in "
5294 & "limited with_clauses", N
);
5297 when N_Generic_Instantiation
=>
5298 Error_Msg_N
("generic instantiations not allowed in "
5299 & "limited with_clauses", N
);
5302 when N_Generic_Renaming_Declaration
=>
5303 Error_Msg_N
("generic renamings not allowed in "
5304 & "limited with_clauses", N
);
5307 when N_Subprogram_Renaming_Declaration
=>
5308 Error_Msg_N
("renamed subprograms not allowed in "
5309 & "limited with_clauses", N
);
5312 when N_Package_Renaming_Declaration
=>
5313 Error_Msg_N
("renamed packages not allowed in "
5314 & "limited with_clauses", N
);
5318 raise Program_Error
;
5321 -- Check if the chain is already built
5323 Spec
:= Specification
(Unit
(Library_Unit
(N
)));
5325 if Limited_View_Installed
(Spec
) then
5329 Set_Ekind
(P
, E_Package
);
5331 -- Build the header of the limited_view
5334 Make_Defining_Identifier
(Sloc
(N
),
5335 Chars
=> New_Internal_Name
(Id_Char
=> 'Z'));
5336 Set_Ekind
(Lim_Header
, E_Package
);
5337 Set_Is_Internal
(Lim_Header
);
5338 Set_Limited_View
(P
, Lim_Header
);
5340 -- Create the auxiliary chain. All the shadow entities are appended to
5341 -- the list of entities of the limited-view header
5345 First_Decl
=> First
(Visible_Declarations
(Spec
)));
5347 -- Save the last built shadow entity. It is needed later to set the
5348 -- reference to the first shadow entity in the private part
5350 Last_Pub_Lim_E
:= Last_Lim_E
;
5352 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5353 -- Required to give support to limited-private-with clauses
5355 Build_Chain
(Scope
=> P
,
5356 First_Decl
=> First
(Private_Declarations
(Spec
)));
5358 if Last_Pub_Lim_E
/= Empty
then
5359 Set_First_Private_Entity
(Lim_Header
,
5360 Next_Entity
(Last_Pub_Lim_E
));
5362 Set_First_Private_Entity
(Lim_Header
,
5366 Set_Limited_View_Installed
(Spec
);
5367 end Build_Limited_Views
;
5369 -------------------------------
5370 -- Check_Body_Needed_For_SAL --
5371 -------------------------------
5373 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
) is
5375 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean;
5376 -- Determine whether use of entity E might require the presence of its
5377 -- body. For a package this requires a recursive traversal of all nested
5380 ---------------------------
5381 -- Entity_Needed_For_SAL --
5382 ---------------------------
5384 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean is
5388 if Is_Subprogram
(E
)
5389 and then Has_Pragma_Inline
(E
)
5393 elsif Ekind
(E
) = E_Generic_Function
5394 or else Ekind
(E
) = E_Generic_Procedure
5398 elsif Ekind
(E
) = E_Generic_Package
5400 Nkind
(Unit_Declaration_Node
(E
)) = N_Generic_Package_Declaration
5401 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
5405 elsif Ekind
(E
) = E_Package
5407 Nkind
(Unit_Declaration_Node
(E
)) = N_Package_Declaration
5408 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
5410 Ent
:= First_Entity
(E
);
5411 while Present
(Ent
) loop
5412 if Entity_Needs_Body
(Ent
) then
5424 end Entity_Needs_Body
;
5426 -- Start of processing for Check_Body_Needed_For_SAL
5429 if Ekind
(Unit_Name
) = E_Generic_Package
5431 Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
5432 N_Generic_Package_Declaration
5434 Present
(Corresponding_Body
(Unit_Declaration_Node
(Unit_Name
)))
5436 Set_Body_Needed_For_SAL
(Unit_Name
);
5438 elsif Ekind
(Unit_Name
) = E_Generic_Procedure
5439 or else Ekind
(Unit_Name
) = E_Generic_Function
5441 Set_Body_Needed_For_SAL
(Unit_Name
);
5443 elsif Is_Subprogram
(Unit_Name
)
5444 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
5445 N_Subprogram_Declaration
5446 and then Has_Pragma_Inline
(Unit_Name
)
5448 Set_Body_Needed_For_SAL
(Unit_Name
);
5450 elsif Ekind
(Unit_Name
) = E_Subprogram_Body
then
5451 Check_Body_Needed_For_SAL
5452 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
5454 elsif Ekind
(Unit_Name
) = E_Package
5455 and then Entity_Needs_Body
(Unit_Name
)
5457 Set_Body_Needed_For_SAL
(Unit_Name
);
5459 elsif Ekind
(Unit_Name
) = E_Package_Body
5460 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) = N_Package_Body
5462 Check_Body_Needed_For_SAL
5463 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
5465 end Check_Body_Needed_For_SAL
;
5467 --------------------
5468 -- Remove_Context --
5469 --------------------
5471 procedure Remove_Context
(N
: Node_Id
) is
5472 Lib_Unit
: constant Node_Id
:= Unit
(N
);
5475 -- If this is a child unit, first remove the parent units
5477 if Is_Child_Spec
(Lib_Unit
) then
5478 Remove_Parents
(Lib_Unit
);
5481 Remove_Context_Clauses
(N
);
5484 ----------------------------
5485 -- Remove_Context_Clauses --
5486 ----------------------------
5488 procedure Remove_Context_Clauses
(N
: Node_Id
) is
5490 Unit_Name
: Entity_Id
;
5493 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5494 -- limited-views first and regular-views later (to maintain the
5497 -- First Phase: Remove limited_with context clauses
5499 Item
:= First
(Context_Items
(N
));
5500 while Present
(Item
) loop
5502 -- We are interested only in with clauses which got installed
5505 if Nkind
(Item
) = N_With_Clause
5506 and then Limited_Present
(Item
)
5507 and then Limited_View_Installed
(Item
)
5509 Remove_Limited_With_Clause
(Item
);
5515 -- Second Phase: Loop through context items and undo regular
5516 -- with_clauses and use_clauses.
5518 Item
:= First
(Context_Items
(N
));
5519 while Present
(Item
) loop
5521 -- We are interested only in with clauses which got installed on
5522 -- entry, as indicated by their Context_Installed flag set
5524 if Nkind
(Item
) = N_With_Clause
5525 and then Limited_Present
(Item
)
5526 and then Limited_View_Installed
(Item
)
5530 elsif Nkind
(Item
) = N_With_Clause
5531 and then Context_Installed
(Item
)
5533 -- Remove items from one with'ed unit
5535 Unit_Name
:= Entity
(Name
(Item
));
5536 Remove_Unit_From_Visibility
(Unit_Name
);
5537 Set_Context_Installed
(Item
, False);
5539 elsif Nkind
(Item
) = N_Use_Package_Clause
then
5540 End_Use_Package
(Item
);
5542 elsif Nkind
(Item
) = N_Use_Type_Clause
then
5543 End_Use_Type
(Item
);
5548 end Remove_Context_Clauses
;
5550 --------------------------------
5551 -- Remove_Limited_With_Clause --
5552 --------------------------------
5554 procedure Remove_Limited_With_Clause
(N
: Node_Id
) is
5555 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
5558 Lim_Header
: Entity_Id
;
5559 Lim_Typ
: Entity_Id
;
5563 pragma Assert
(Limited_View_Installed
(N
));
5565 -- In case of limited with_clause on subprograms, generics, instances,
5566 -- or renamings, the corresponding error was previously posted and we
5567 -- have nothing to do here.
5569 if Nkind
(P_Unit
) /= N_Package_Declaration
then
5573 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
5575 -- Handle child packages
5577 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
5578 P
:= Defining_Identifier
(P
);
5581 if Debug_Flag_I
then
5582 Write_Str
("remove limited view of ");
5583 Write_Name
(Chars
(P
));
5584 Write_Str
(" from visibility");
5588 -- Prepare the removal of the shadow entities from visibility. The
5589 -- first element of the limited view is a header (an E_Package
5590 -- entity) that is used to reference the first shadow entity in the
5591 -- private part of the package
5593 Lim_Header
:= Limited_View
(P
);
5594 Lim_Typ
:= First_Entity
(Lim_Header
);
5596 -- Remove package and shadow entities from visibility if it has not
5599 if not Analyzed
(P_Unit
) then
5601 Set_Is_Immediately_Visible
(P
, False);
5603 while Present
(Lim_Typ
) loop
5605 Next_Entity
(Lim_Typ
);
5608 -- Otherwise this package has already appeared in the closure and its
5609 -- shadow entities must be replaced by its real entities. This code
5610 -- must be kept synchronized with the complementary code in Install
5611 -- Limited_Withed_Unit.
5614 -- Real entities that are type or subtype declarations were hidden
5615 -- from visibility at the point of installation of the limited-view.
5616 -- Now we recover the previous value of the hidden attribute.
5618 E
:= First_Entity
(P
);
5619 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
5621 Set_Is_Hidden
(E
, Was_Hidden
(E
));
5627 while Present
(Lim_Typ
)
5628 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
5630 -- Nested packages and child units were not unchained
5632 if Ekind
(Lim_Typ
) /= E_Package
5633 and then not Is_Child_Unit
(Non_Limited_View
(Lim_Typ
))
5635 -- Handle incomplete types of the real view. For this purpose
5636 -- we traverse the list of visible entities to look for an
5637 -- incomplete type in the real-view associated with Lim_Typ.
5639 E
:= First_Entity
(P
);
5640 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
5641 exit when Ekind
(E
) = E_Incomplete_Type
5642 and then Present
(Full_View
(E
))
5643 and then Full_View
(E
) = Lim_Typ
;
5648 -- If the previous search was not successful then the entity
5649 -- to be restored in the homonym list is the non-limited view
5651 if E
= First_Private_Entity
(P
) then
5652 E
:= Non_Limited_View
(Lim_Typ
);
5655 pragma Assert
(not In_Chain
(E
));
5657 Prev
:= Current_Entity
(Lim_Typ
);
5659 if Prev
= Lim_Typ
then
5660 Set_Current_Entity
(E
);
5663 while Present
(Prev
)
5664 and then Homonym
(Prev
) /= Lim_Typ
5666 Prev
:= Homonym
(Prev
);
5669 if Present
(Prev
) then
5670 Set_Homonym
(Prev
, E
);
5674 -- We must also set the next homonym entity of the real entity
5675 -- to handle the case in which the next homonym was a shadow
5678 Set_Homonym
(E
, Homonym
(Lim_Typ
));
5681 Next_Entity
(Lim_Typ
);
5685 -- Indicate that the limited view of the package is not installed
5687 Set_From_With_Type
(P
, False);
5688 Set_Limited_View_Installed
(N
, False);
5689 end Remove_Limited_With_Clause
;
5691 --------------------
5692 -- Remove_Parents --
5693 --------------------
5695 procedure Remove_Parents
(Lib_Unit
: Node_Id
) is
5698 P_Spec
: Node_Id
:= Empty
;
5700 Vis
: constant Boolean :=
5701 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
;
5704 if Is_Child_Spec
(Lib_Unit
) then
5705 P_Spec
:= Parent_Spec
(Lib_Unit
);
5707 elsif Nkind
(Lib_Unit
) = N_Package_Body
5708 and then Nkind
(Original_Node
(Lib_Unit
)) = N_Package_Instantiation
5710 P_Spec
:= Parent_Spec
(Original_Node
(Lib_Unit
));
5713 if Present
(P_Spec
) then
5716 P_Name
:= Get_Parent_Entity
(P
);
5717 Remove_Context_Clauses
(P_Spec
);
5718 End_Package_Scope
(P_Name
);
5719 Set_Is_Immediately_Visible
(P_Name
, Vis
);
5721 -- Remove from visibility the siblings as well, which are directly
5722 -- visible while the parent is in scope.
5724 E
:= First_Entity
(P_Name
);
5725 while Present
(E
) loop
5726 if Is_Child_Unit
(E
) then
5727 Set_Is_Immediately_Visible
(E
, False);
5733 Set_In_Package_Body
(P_Name
, False);
5735 -- This is the recursive call to remove the context of any
5736 -- higher level parent. This recursion ensures that all parents
5737 -- are removed in the reverse order of their installation.
5743 ---------------------------------
5744 -- Remove_Private_With_Clauses --
5745 ---------------------------------
5747 procedure Remove_Private_With_Clauses
(Comp_Unit
: Node_Id
) is
5750 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean;
5751 -- Check whether a given unit appears in a regular with_clause.
5752 -- Used to determine whether a private_with_clause, implicit or
5753 -- explicit, should be ignored.
5755 ----------------------------
5756 -- In_Regular_With_Clause --
5757 ----------------------------
5759 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean
5764 Item
:= First
(Context_Items
(Comp_Unit
));
5765 while Present
(Item
) loop
5766 if Nkind
(Item
) = N_With_Clause
5767 and then Entity
(Name
(Item
)) = E
5768 and then not Private_Present
(Item
)
5776 end In_Regular_With_Clause
;
5778 -- Start of processing for Remove_Private_With_Clauses
5781 Item
:= First
(Context_Items
(Comp_Unit
));
5782 while Present
(Item
) loop
5783 if Nkind
(Item
) = N_With_Clause
5784 and then Private_Present
(Item
)
5786 -- If private_with_clause is redundant, remove it from
5787 -- context, as a small optimization to subsequent handling
5788 -- of private_with clauses in other nested packages..
5790 if In_Regular_With_Clause
(Entity
(Name
(Item
))) then
5792 Nxt
: constant Node_Id
:= Next
(Item
);
5798 elsif Limited_Present
(Item
) then
5799 if not Limited_View_Installed
(Item
) then
5800 Remove_Limited_With_Clause
(Item
);
5806 Remove_Unit_From_Visibility
(Entity
(Name
(Item
)));
5807 Set_Context_Installed
(Item
, False);
5815 end Remove_Private_With_Clauses
;
5817 ---------------------------------
5818 -- Remove_Unit_From_Visibility --
5819 ---------------------------------
5821 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
) is
5822 P
: constant Entity_Id
:= Scope
(Unit_Name
);
5825 if Debug_Flag_I
then
5826 Write_Str
("remove unit ");
5827 Write_Name
(Chars
(Unit_Name
));
5828 Write_Str
(" from visibility");
5832 if P
/= Standard_Standard
then
5833 Set_Is_Visible_Child_Unit
(Unit_Name
, False);
5836 Set_Is_Potentially_Use_Visible
(Unit_Name
, False);
5837 Set_Is_Immediately_Visible
(Unit_Name
, False);
5838 end Remove_Unit_From_Visibility
;
5853 procedure Unchain
(E
: Entity_Id
) is
5857 Prev
:= Current_Entity
(E
);
5863 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
5866 while Present
(Prev
)
5867 and then Homonym
(Prev
) /= E
5869 Prev
:= Homonym
(Prev
);
5872 if Present
(Prev
) then
5873 Set_Homonym
(Prev
, Homonym
(E
));
5877 if Debug_Flag_I
then
5878 Write_Str
(" (homonym) unchain ");
5879 Write_Name
(Chars
(E
));