1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree
; use Atree
;
27 with Debug
; use Debug
;
28 with Einfo
; use Einfo
;
29 with Errout
; use Errout
;
30 with Exp_Util
; use Exp_Util
;
31 with Elists
; use Elists
;
32 with Fname
; use Fname
;
33 with Fname
.UF
; use Fname
.UF
;
34 with Freeze
; use Freeze
;
35 with Impunit
; use Impunit
;
36 with Inline
; use Inline
;
38 with Lib
.Load
; use Lib
.Load
;
39 with Lib
.Xref
; use Lib
.Xref
;
40 with Namet
; use Namet
;
41 with Nlists
; use Nlists
;
42 with Nmake
; use Nmake
;
44 with Output
; use Output
;
45 with Par_SCO
; use Par_SCO
;
46 with Restrict
; use Restrict
;
47 with Rident
; use Rident
;
48 with Rtsfind
; use Rtsfind
;
50 with Sem_Ch3
; use Sem_Ch3
;
51 with Sem_Ch6
; use Sem_Ch6
;
52 with Sem_Ch7
; use Sem_Ch7
;
53 with Sem_Ch8
; use Sem_Ch8
;
54 with Sem_Dist
; use Sem_Dist
;
55 with Sem_Prag
; use Sem_Prag
;
56 with Sem_Util
; use Sem_Util
;
57 with Sem_Warn
; use Sem_Warn
;
58 with Stand
; use Stand
;
59 with Sinfo
; use Sinfo
;
60 with Sinfo
.CN
; use Sinfo
.CN
;
61 with Sinput
; use Sinput
;
62 with Snames
; use Snames
;
63 with Style
; use Style
;
64 with Stylesw
; use Stylesw
;
65 with Tbuild
; use Tbuild
;
66 with Uname
; use Uname
;
68 package body Sem_Ch10
is
70 -----------------------
71 -- Local Subprograms --
72 -----------------------
74 procedure Analyze_Context
(N
: Node_Id
);
75 -- Analyzes items in the context clause of compilation unit
77 procedure Build_Limited_Views
(N
: Node_Id
);
78 -- Build and decorate the list of shadow entities for a package mentioned
79 -- in a limited_with clause. If the package was not previously analyzed
80 -- then it also performs a basic decoration of the real entities. This is
81 -- required to do not pass non-decorated entities to the back-end.
82 -- Implements Ada 2005 (AI-50217).
84 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
);
85 -- Check whether the source for the body of a compilation unit must be
86 -- included in a standalone library.
88 procedure Check_Private_Child_Unit
(N
: Node_Id
);
89 -- If a with_clause mentions a private child unit, the compilation unit
90 -- must be a member of the same family, as described in 10.1.2.
92 procedure Check_Stub_Level
(N
: Node_Id
);
93 -- Verify that a stub is declared immediately within a compilation unit,
94 -- and not in an inner frame.
96 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
);
97 -- When a child unit appears in a context clause, the implicit withs on
98 -- parents are made explicit, and with clauses are inserted in the context
99 -- clause before the one for the child. If a parent in the with_clause
100 -- is a renaming, the implicit with_clause is on the renaming whose name
101 -- is mentioned in the with_clause, and not on the package it renames.
102 -- N is the compilation unit whose list of context items receives the
103 -- implicit with_clauses.
105 function Get_Parent_Entity
(Unit
: Node_Id
) return Entity_Id
;
106 -- Get defining entity of parent unit of a child unit. In most cases this
107 -- is the defining entity of the unit, but for a child instance whose
108 -- parent needs a body for inlining, the instantiation node of the parent
109 -- has not yet been rewritten as a package declaration, and the entity has
110 -- to be retrieved from the Instance_Spec of the unit.
112 function Has_With_Clause
115 Is_Limited
: Boolean := False) return Boolean;
116 -- Determine whether compilation unit C_Unit contains a [limited] with
117 -- clause for package Pack. Use the flag Is_Limited to designate desired
120 procedure Implicit_With_On_Parent
(Child_Unit
: Node_Id
; N
: Node_Id
);
121 -- If the main unit is a child unit, implicit withs are also added for
122 -- all its ancestors.
124 function In_Chain
(E
: Entity_Id
) return Boolean;
125 -- Check that the shadow entity is not already in the homonym chain, for
126 -- example through a limited_with clause in a parent unit.
128 procedure Install_Context_Clauses
(N
: Node_Id
);
129 -- Subsidiary to Install_Context and Install_Parents. Process all with
130 -- and use clauses for current unit and its library unit if any.
132 procedure Install_Limited_Context_Clauses
(N
: Node_Id
);
133 -- Subsidiary to Install_Context. Process only limited with_clauses for
134 -- current unit. Implements Ada 2005 (AI-50217).
136 procedure Install_Limited_Withed_Unit
(N
: Node_Id
);
137 -- Place shadow entities for a limited_with package in the visibility
138 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
140 procedure Install_Withed_Unit
141 (With_Clause
: Node_Id
;
142 Private_With_OK
: Boolean := False);
143 -- If the unit is not a child unit, make unit immediately visible. The
144 -- caller ensures that the unit is not already currently installed. The
145 -- flag Private_With_OK is set true in Install_Private_With_Clauses, which
146 -- is called when compiling the private part of a package, or installing
147 -- the private declarations of a parent unit.
149 procedure Install_Parents
(Lib_Unit
: Node_Id
; Is_Private
: Boolean);
150 -- This procedure establishes the context for the compilation of a child
151 -- unit. If Lib_Unit is a child library spec then the context of the parent
152 -- is installed, and the parent itself made immediately visible, so that
153 -- the child unit is processed in the declarative region of the parent.
154 -- Install_Parents makes a recursive call to itself to ensure that all
155 -- parents are loaded in the nested case. If Lib_Unit is a library body,
156 -- the only effect of Install_Parents is to install the private decls of
157 -- the parents, because the visible parent declarations will have been
158 -- installed as part of the context of the corresponding spec.
160 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
);
161 -- In the compilation of a child unit, a child of any of the ancestor
162 -- units is directly visible if it is visible, because the parent is in
163 -- an enclosing scope. Iterate over context to find child units of U_Name
164 -- or of some ancestor of it.
166 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean;
167 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
168 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
169 -- a library spec that has a parent. If the call to Is_Child_Spec returns
170 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
171 -- compilation unit for the parent spec.
173 -- Lib_Unit can also be a subprogram body that acts as its own spec. If the
174 -- Parent_Spec is non-empty, this is also a child unit.
176 procedure Remove_Context_Clauses
(N
: Node_Id
);
177 -- Subsidiary of previous one. Remove use_ and with_clauses
179 procedure Remove_Limited_With_Clause
(N
: Node_Id
);
180 -- Remove from visibility the shadow entities introduced for a package
181 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
183 procedure Remove_Parents
(Lib_Unit
: Node_Id
);
184 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
185 -- contexts established by the corresponding call to Install_Parents are
186 -- removed. Remove_Parents contains a recursive call to itself to ensure
187 -- that all parents are removed in the nested case.
189 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
);
190 -- Reset all visibility flags on unit after compiling it, either as a main
191 -- unit or as a unit in the context.
193 procedure Unchain
(E
: Entity_Id
);
194 -- Remove single entity from visibility list
196 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
);
197 -- Common processing for all stubs (subprograms, tasks, packages, and
198 -- protected cases). N is the stub to be analyzed. Once the subunit name
199 -- is established, load and analyze. Nam is the non-overloadable entity
200 -- for which the proper body provides a completion. Subprogram stubs are
201 -- handled differently because they can be declarations.
204 -- A dummy procedure, for debugging use, called just before analyzing the
205 -- main unit (after dealing with any context clauses).
207 --------------------------
208 -- Limited_With_Clauses --
209 --------------------------
211 -- Limited_With clauses are the mechanism chosen for Ada05 to support
212 -- mutually recursive types declared in different units. A limited_with
213 -- clause that names package P in the context of unit U makes the types
214 -- declared in the visible part of P available within U, but with the
215 -- restriction that these types can only be used as incomplete types.
216 -- The limited_with clause does not impose a semantic dependence on P,
217 -- and it is possible for two packages to have limited_with_clauses on
218 -- each other without creating an elaboration circularity.
220 -- To support this feature, the analysis of a limited_with clause must
221 -- create an abbreviated view of the package, without performing any
222 -- semantic analysis on it. This "package abstract" contains shadow types
223 -- that are in one-one correspondence with the real types in the package,
224 -- and that have the properties of incomplete types.
226 -- The implementation creates two element lists: one to chain the shadow
227 -- entities, and one to chain the corresponding type entities in the tree
228 -- of the package. Links between corresponding entities in both chains
229 -- allow the compiler to select the proper view of a given type, depending
230 -- on the context. Note that in contrast with the handling of private
231 -- types, the limited view and the non-limited view of a type are treated
232 -- as separate entities, and no entity exchange needs to take place, which
233 -- makes the implementation must simpler than could be feared.
235 ------------------------------
236 -- Analyze_Compilation_Unit --
237 ------------------------------
239 procedure Analyze_Compilation_Unit
(N
: Node_Id
) is
240 Unit_Node
: constant Node_Id
:= Unit
(N
);
241 Lib_Unit
: Node_Id
:= Library_Unit
(N
);
243 Main_Cunit
: constant Node_Id
:= Cunit
(Main_Unit
);
244 Par_Spec_Name
: Unit_Name_Type
;
245 Unum
: Unit_Number_Type
;
247 procedure Check_Redundant_Withs
248 (Context_Items
: List_Id
;
249 Spec_Context_Items
: List_Id
:= No_List
);
250 -- Determine whether the context list of a compilation unit contains
251 -- redundant with clauses. When checking body clauses against spec
252 -- clauses, set Context_Items to the context list of the body and
253 -- Spec_Context_Items to that of the spec. Parent packages are not
254 -- examined for documentation purposes.
256 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
);
257 -- Generate cross-reference information for the parents of child units.
258 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
260 ---------------------------
261 -- Check_Redundant_Withs --
262 ---------------------------
264 procedure Check_Redundant_Withs
265 (Context_Items
: List_Id
;
266 Spec_Context_Items
: List_Id
:= No_List
)
270 procedure Process_Body_Clauses
271 (Context_List
: List_Id
;
273 Used
: in out Boolean;
274 Used_Type_Or_Elab
: in out Boolean);
275 -- Examine the context clauses of a package body, trying to match the
276 -- name entity of Clause with any list element. If the match occurs
277 -- on a use package clause set Used to True, for a use type clause or
278 -- pragma Elaborate[_All], set Used_Type_Or_Elab to True.
280 procedure Process_Spec_Clauses
281 (Context_List
: List_Id
;
283 Used
: in out Boolean;
284 Withed
: in out Boolean;
285 Exit_On_Self
: Boolean := False);
286 -- Examine the context clauses of a package spec, trying to match
287 -- the name entity of Clause with any list element. If the match
288 -- occurs on a use package clause, set Used to True, for a with
289 -- package clause other than Clause, set Withed to True. Limited
290 -- with clauses, implicitly generated with clauses and withs
291 -- having pragmas Elaborate or Elaborate_All applied to them are
292 -- skipped. Exit_On_Self is used to control the search loop and
293 -- force an exit whenever Clause sees itself in the search.
295 --------------------------
296 -- Process_Body_Clauses --
297 --------------------------
299 procedure Process_Body_Clauses
300 (Context_List
: List_Id
;
302 Used
: in out Boolean;
303 Used_Type_Or_Elab
: in out Boolean)
305 Nam_Ent
: constant Entity_Id
:= Entity
(Name
(Clause
));
311 function Same_Unit
(N
: Node_Id
; P
: Entity_Id
) return Boolean;
312 -- In an expanded name in a use clause, if the prefix is a renamed
313 -- package, the entity is set to the original package as a result,
314 -- when checking whether the package appears in a previous with
315 -- clause, the renaming has to be taken into account, to prevent
316 -- spurious/incorrect warnings. A common case is use of Text_IO.
322 function Same_Unit
(N
: Node_Id
; P
: Entity_Id
) return Boolean is
324 return Entity
(N
) = P
326 (Present
(Renamed_Object
(P
))
327 and then Entity
(N
) = Renamed_Object
(P
));
330 -- Start of processing for Process_Body_Clauses
334 Used_Type_Or_Elab
:= False;
336 Cont_Item
:= First
(Context_List
);
337 while Present
(Cont_Item
) loop
339 -- Package use clause
341 if Nkind
(Cont_Item
) = N_Use_Package_Clause
344 -- Search through use clauses
346 Use_Item
:= First
(Names
(Cont_Item
));
347 while Present
(Use_Item
) and then not Used
loop
349 -- Case of a direct use of the one we are looking for
351 if Entity
(Use_Item
) = Nam_Ent
then
354 -- Handle nested case, as in "with P; use P.Q.R"
361 -- Loop through prefixes looking for match
364 while Nkind
(UE
) = N_Expanded_Name
loop
365 if Same_Unit
(Prefix
(UE
), Nam_Ent
) then
380 elsif Nkind
(Cont_Item
) = N_Use_Type_Clause
381 and then not Used_Type_Or_Elab
383 Subt_Mark
:= First
(Subtype_Marks
(Cont_Item
));
384 while Present
(Subt_Mark
)
385 and then not Used_Type_Or_Elab
387 if Same_Unit
(Prefix
(Subt_Mark
), Nam_Ent
) then
388 Used_Type_Or_Elab
:= True;
394 -- Pragma Elaborate or Elaborate_All
396 elsif Nkind
(Cont_Item
) = N_Pragma
398 (Pragma_Name
(Cont_Item
) = Name_Elaborate
400 Pragma_Name
(Cont_Item
) = Name_Elaborate_All
)
401 and then not Used_Type_Or_Elab
404 First
(Pragma_Argument_Associations
(Cont_Item
));
405 while Present
(Prag_Unit
)
406 and then not Used_Type_Or_Elab
408 if Entity
(Expression
(Prag_Unit
)) = Nam_Ent
then
409 Used_Type_Or_Elab
:= True;
418 end Process_Body_Clauses
;
420 --------------------------
421 -- Process_Spec_Clauses --
422 --------------------------
424 procedure Process_Spec_Clauses
425 (Context_List
: List_Id
;
427 Used
: in out Boolean;
428 Withed
: in out Boolean;
429 Exit_On_Self
: Boolean := False)
431 Nam_Ent
: constant Entity_Id
:= Entity
(Name
(Clause
));
439 Cont_Item
:= First
(Context_List
);
440 while Present
(Cont_Item
) loop
442 -- Stop the search since the context items after Cont_Item have
443 -- already been examined in a previous iteration of the reverse
444 -- loop in Check_Redundant_Withs.
447 and Cont_Item
= Clause
452 -- Package use clause
454 if Nkind
(Cont_Item
) = N_Use_Package_Clause
457 Use_Item
:= First
(Names
(Cont_Item
));
458 while Present
(Use_Item
) and then not Used
loop
459 if Entity
(Use_Item
) = Nam_Ent
then
466 -- Package with clause. Avoid processing self, implicitly
467 -- generated with clauses or limited with clauses. Note that
468 -- we examine with clauses having pragmas Elaborate or
469 -- Elaborate_All applied to them due to cases such as:
474 -- pragma Elaborate (Pack);
476 -- In this case, the second with clause is redundant since
477 -- the pragma applies only to the first "with Pack;".
479 elsif Nkind
(Cont_Item
) = N_With_Clause
480 and then not Implicit_With
(Cont_Item
)
481 and then not Limited_Present
(Cont_Item
)
482 and then Cont_Item
/= Clause
483 and then Entity
(Name
(Cont_Item
)) = Nam_Ent
490 end Process_Spec_Clauses
;
492 -- Start of processing for Check_Redundant_Withs
495 Clause
:= Last
(Context_Items
);
496 while Present
(Clause
) loop
498 -- Avoid checking implicitly generated with clauses, limited with
499 -- clauses or withs that have pragma Elaborate or Elaborate_All.
501 if Nkind
(Clause
) = N_With_Clause
502 and then not Implicit_With
(Clause
)
503 and then not Limited_Present
(Clause
)
504 and then not Elaborate_Present
(Clause
)
506 -- Package body-to-spec check
508 if Present
(Spec_Context_Items
) then
510 Used_In_Body
: Boolean := False;
511 Used_In_Spec
: Boolean := False;
512 Used_Type_Or_Elab
: Boolean := False;
513 Withed_In_Spec
: Boolean := False;
517 (Context_List
=> Spec_Context_Items
,
519 Used
=> Used_In_Spec
,
520 Withed
=> Withed_In_Spec
);
523 (Context_List
=> Context_Items
,
525 Used
=> Used_In_Body
,
526 Used_Type_Or_Elab
=> Used_Type_Or_Elab
);
528 -- "Type Elab" refers to the presence of either a use
529 -- type clause, pragmas Elaborate or Elaborate_All.
531 -- +---------------+---------------------------+------+
532 -- | Spec | Body | Warn |
533 -- +--------+------+--------+------+-----------+------+
534 -- | Withed | Used | Withed | Used | Type Elab | |
535 -- | X | | X | | | X |
536 -- | X | | X | X | | |
537 -- | X | | X | | X | |
538 -- | X | | X | X | X | |
539 -- | X | X | X | | | X |
540 -- | X | X | X | | X | |
541 -- | X | X | X | X | | X |
542 -- | X | X | X | X | X | |
543 -- +--------+------+--------+------+-----------+------+
546 and then not Used_Type_Or_Elab
)
549 and then not Used_In_Body
)
553 Error_Msg_N
-- CODEFIX
554 ("?redundant with clause in body", Clause
);
557 Used_In_Body
:= False;
558 Used_In_Spec
:= False;
559 Used_Type_Or_Elab
:= False;
560 Withed_In_Spec
:= False;
563 -- Standalone package spec or body check
567 Dont_Care
: Boolean := False;
568 Withed
: Boolean := False;
571 -- The mechanism for examining the context clauses of a
572 -- package spec can be applied to package body clauses.
575 (Context_List
=> Context_Items
,
579 Exit_On_Self
=> True);
582 Error_Msg_N
-- CODEFIX
583 ("?redundant with clause", Clause
);
591 end Check_Redundant_Withs
;
593 --------------------------------
594 -- Generate_Parent_References --
595 --------------------------------
597 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
) is
599 P_Name
: Entity_Id
:= P_Id
;
602 Pref
:= Name
(Parent
(Defining_Entity
(N
)));
604 if Nkind
(Pref
) = N_Expanded_Name
then
606 -- Done already, if the unit has been compiled indirectly as
607 -- part of the closure of its context because of inlining.
612 while Nkind
(Pref
) = N_Selected_Component
loop
613 Change_Selected_Component_To_Expanded_Name
(Pref
);
614 Set_Entity
(Pref
, P_Name
);
615 Set_Etype
(Pref
, Etype
(P_Name
));
616 Generate_Reference
(P_Name
, Pref
, 'r');
617 Pref
:= Prefix
(Pref
);
618 P_Name
:= Scope
(P_Name
);
621 -- The guard here on P_Name is to handle the error condition where
622 -- the parent unit is missing because the file was not found.
624 if Present
(P_Name
) then
625 Set_Entity
(Pref
, P_Name
);
626 Set_Etype
(Pref
, Etype
(P_Name
));
627 Generate_Reference
(P_Name
, Pref
, 'r');
628 Style
.Check_Identifier
(Pref
, P_Name
);
630 end Generate_Parent_References
;
632 -- Start of processing for Analyze_Compilation_Unit
635 Process_Compilation_Unit_Pragmas
(N
);
637 -- If the unit is a subunit whose parent has not been analyzed (which
638 -- indicates that the main unit is a subunit, either the current one or
639 -- one of its descendents) then the subunit is compiled as part of the
640 -- analysis of the parent, which we proceed to do. Basically this gets
641 -- handled from the top down and we don't want to do anything at this
642 -- level (i.e. this subunit will be handled on the way down from the
643 -- parent), so at this level we immediately return. If the subunit ends
644 -- up not analyzed, it means that the parent did not contain a stub for
645 -- it, or that there errors were detected in some ancestor.
647 if Nkind
(Unit_Node
) = N_Subunit
648 and then not Analyzed
(Lib_Unit
)
650 Semantics
(Lib_Unit
);
652 if not Analyzed
(Proper_Body
(Unit_Node
)) then
653 if Serious_Errors_Detected
> 0 then
654 Error_Msg_N
("subunit not analyzed (errors in parent unit)", N
);
656 Error_Msg_N
("missing stub for subunit", N
);
663 -- Analyze context (this will call Sem recursively for with'ed units) To
664 -- detect circularities among with-clauses that are not caught during
665 -- loading, we set the Context_Pending flag on the current unit. If the
666 -- flag is already set there is a potential circularity. We exclude
667 -- predefined units from this check because they are known to be safe.
668 -- We also exclude package bodies that are present because circularities
669 -- between bodies are harmless (and necessary).
671 if Context_Pending
(N
) then
673 Circularity
: Boolean := True;
676 if Is_Predefined_File_Name
677 (Unit_File_Name
(Get_Source_Unit
(Unit
(N
))))
679 Circularity
:= False;
682 for U
in Main_Unit
+ 1 .. Last_Unit
loop
683 if Nkind
(Unit
(Cunit
(U
))) = N_Package_Body
684 and then not Analyzed
(Cunit
(U
))
686 Circularity
:= False;
693 Error_Msg_N
("circular dependency caused by with_clauses", N
);
695 ("\possibly missing limited_with clause"
696 & " in one of the following", N
);
698 for U
in Main_Unit
.. Last_Unit
loop
699 if Context_Pending
(Cunit
(U
)) then
700 Error_Msg_Unit_1
:= Get_Unit_Name
(Unit
(Cunit
(U
)));
701 Error_Msg_N
("\unit$", N
);
705 raise Unrecoverable_Error
;
709 Set_Context_Pending
(N
);
714 Set_Context_Pending
(N
, False);
716 -- If the unit is a package body, the spec is already loaded and must be
717 -- analyzed first, before we analyze the body.
719 if Nkind
(Unit_Node
) = N_Package_Body
then
721 -- If no Lib_Unit, then there was a serious previous error, so just
722 -- ignore the entire analysis effort
724 if No
(Lib_Unit
) then
728 Semantics
(Lib_Unit
);
729 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
731 -- Verify that the library unit is a package declaration
733 if not Nkind_In
(Unit
(Lib_Unit
), N_Package_Declaration
,
734 N_Generic_Package_Declaration
)
737 ("no legal package declaration for package body", N
);
740 -- Otherwise, the entity in the declaration is visible. Update the
741 -- version to reflect dependence of this body on the spec.
744 Spec_Id
:= Defining_Entity
(Unit
(Lib_Unit
));
745 Set_Is_Immediately_Visible
(Spec_Id
, True);
746 Version_Update
(N
, Lib_Unit
);
748 if Nkind
(Defining_Unit_Name
(Unit_Node
)) =
749 N_Defining_Program_Unit_Name
751 Generate_Parent_References
(Unit_Node
, Scope
(Spec_Id
));
756 -- If the unit is a subprogram body, then we similarly need to analyze
757 -- its spec. However, things are a little simpler in this case, because
758 -- here, this analysis is done only for error checking and consistency
759 -- purposes, so there's nothing else to be done.
761 elsif Nkind
(Unit_Node
) = N_Subprogram_Body
then
762 if Acts_As_Spec
(N
) then
764 -- If the subprogram body is a child unit, we must create a
765 -- declaration for it, in order to properly load the parent(s).
766 -- After this, the original unit does not acts as a spec, because
767 -- there is an explicit one. If this unit appears in a context
768 -- clause, then an implicit with on the parent will be added when
769 -- installing the context. If this is the main unit, there is no
770 -- Unit_Table entry for the declaration (it has the unit number
771 -- of the main unit) and code generation is unaffected.
773 Unum
:= Get_Cunit_Unit_Number
(N
);
774 Par_Spec_Name
:= Get_Parent_Spec_Name
(Unit_Name
(Unum
));
776 if Par_Spec_Name
/= No_Unit_Name
then
779 (Load_Name
=> Par_Spec_Name
,
784 if Unum
/= No_Unit
then
786 -- Build subprogram declaration and attach parent unit to it
787 -- This subprogram declaration does not come from source,
788 -- Nevertheless the backend must generate debugging info for
789 -- it, and this must be indicated explicitly. We also mark
790 -- the body entity as a child unit now, to prevent a
791 -- cascaded error if the spec entity cannot be entered
792 -- in its scope. Finally we create a Units table entry for
793 -- the subprogram declaration, to maintain a one-to-one
794 -- correspondence with compilation unit nodes. This is
795 -- critical for the tree traversals performed by CodePeer.
798 Loc
: constant Source_Ptr
:= Sloc
(N
);
799 SCS
: constant Boolean :=
800 Get_Comes_From_Source_Default
;
803 Set_Comes_From_Source_Default
(False);
805 Make_Compilation_Unit
(Loc
,
806 Context_Items
=> New_Copy_List
(Context_Items
(N
)),
808 Make_Subprogram_Declaration
(Sloc
(N
),
811 (Specification
(Unit_Node
))),
813 Make_Compilation_Unit_Aux
(Loc
));
815 Set_Library_Unit
(N
, Lib_Unit
);
816 Set_Parent_Spec
(Unit
(Lib_Unit
), Cunit
(Unum
));
817 Make_Child_Decl_Unit
(N
);
818 Semantics
(Lib_Unit
);
820 -- Now that a separate declaration exists, the body
821 -- of the child unit does not act as spec any longer.
823 Set_Acts_As_Spec
(N
, False);
824 Set_Is_Child_Unit
(Defining_Entity
(Unit_Node
));
825 Set_Debug_Info_Needed
(Defining_Entity
(Unit
(Lib_Unit
)));
826 Set_Comes_From_Source_Default
(SCS
);
831 -- Here for subprogram with separate declaration
834 Semantics
(Lib_Unit
);
835 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
836 Version_Update
(N
, Lib_Unit
);
839 -- If this is a child unit, generate references to the parents
841 if Nkind
(Defining_Unit_Name
(Specification
(Unit_Node
))) =
842 N_Defining_Program_Unit_Name
844 Generate_Parent_References
(
845 Specification
(Unit_Node
),
846 Scope
(Defining_Entity
(Unit
(Lib_Unit
))));
850 -- If it is a child unit, the parent must be elaborated first and we
851 -- update version, since we are dependent on our parent.
853 if Is_Child_Spec
(Unit_Node
) then
855 -- The analysis of the parent is done with style checks off
858 Save_Style_Check
: constant Boolean := Style_Check
;
859 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
860 Cunit_Boolean_Restrictions_Save
;
863 if not GNAT_Mode
then
864 Style_Check
:= False;
867 Semantics
(Parent_Spec
(Unit_Node
));
868 Version_Update
(N
, Parent_Spec
(Unit_Node
));
869 Style_Check
:= Save_Style_Check
;
870 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
874 -- With the analysis done, install the context. Note that we can't
875 -- install the context from the with clauses as we analyze them, because
876 -- each with clause must be analyzed in a clean visibility context, so
877 -- we have to wait and install them all at once.
881 if Is_Child_Spec
(Unit_Node
) then
883 -- Set the entities of all parents in the program_unit_name
885 Generate_Parent_References
(
886 Unit_Node
, Get_Parent_Entity
(Unit
(Parent_Spec
(Unit_Node
))));
889 -- All components of the context: with-clauses, library unit, ancestors
890 -- if any, (and their context) are analyzed and installed.
892 -- Call special debug routine sm if this is the main unit
894 if Current_Sem_Unit
= Main_Unit
then
898 -- Now analyze the unit (package, subprogram spec, body) itself
902 if Warn_On_Redundant_Constructs
then
903 Check_Redundant_Withs
(Context_Items
(N
));
905 if Nkind
(Unit_Node
) = N_Package_Body
then
906 Check_Redundant_Withs
907 (Context_Items
=> Context_Items
(N
),
908 Spec_Context_Items
=> Context_Items
(Lib_Unit
));
912 -- The above call might have made Unit_Node an N_Subprogram_Body from
913 -- something else, so propagate any Acts_As_Spec flag.
915 if Nkind
(Unit_Node
) = N_Subprogram_Body
916 and then Acts_As_Spec
(Unit_Node
)
918 Set_Acts_As_Spec
(N
);
921 -- Register predefined units in Rtsfind
924 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Sloc
(N
));
926 if Is_Predefined_File_Name
(Unit_File_Name
(Unum
)) then
927 Set_RTU_Loaded
(Unit_Node
);
931 -- Treat compilation unit pragmas that appear after the library unit
933 if Present
(Pragmas_After
(Aux_Decls_Node
(N
))) then
935 Prag_Node
: Node_Id
:= First
(Pragmas_After
(Aux_Decls_Node
(N
)));
937 while Present
(Prag_Node
) loop
944 -- Generate distribution stubs if requested and no error
947 and then (Distribution_Stub_Mode
= Generate_Receiver_Stub_Body
949 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
950 and then not Fatal_Error
(Main_Unit
)
952 if Is_RCI_Pkg_Spec_Or_Body
(N
) then
954 -- Regular RCI package
956 Add_Stub_Constructs
(N
);
958 elsif (Nkind
(Unit_Node
) = N_Package_Declaration
959 and then Is_Shared_Passive
(Defining_Entity
960 (Specification
(Unit_Node
))))
961 or else (Nkind
(Unit_Node
) = N_Package_Body
963 Is_Shared_Passive
(Corresponding_Spec
(Unit_Node
)))
965 -- Shared passive package
967 Add_Stub_Constructs
(N
);
969 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
971 Is_Remote_Call_Interface
972 (Defining_Entity
(Specification
(Instance_Spec
(Unit_Node
))))
974 -- Instantiation of a RCI generic package
976 Add_Stub_Constructs
(N
);
980 -- Remove unit from visibility, so that environment is clean for the
981 -- next compilation, which is either the main unit or some other unit
984 if Nkind_In
(Unit_Node
, N_Package_Declaration
,
985 N_Package_Renaming_Declaration
,
986 N_Subprogram_Declaration
)
987 or else Nkind
(Unit_Node
) in N_Generic_Declaration
989 (Nkind
(Unit_Node
) = N_Subprogram_Body
990 and then Acts_As_Spec
(Unit_Node
))
992 Remove_Unit_From_Visibility
(Defining_Entity
(Unit_Node
));
994 -- If the unit is an instantiation whose body will be elaborated for
995 -- inlining purposes, use the proper entity of the instance. The entity
996 -- may be missing if the instantiation was illegal.
998 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
999 and then not Error_Posted
(Unit_Node
)
1000 and then Present
(Instance_Spec
(Unit_Node
))
1002 Remove_Unit_From_Visibility
1003 (Defining_Entity
(Instance_Spec
(Unit_Node
)));
1005 elsif Nkind
(Unit_Node
) = N_Package_Body
1006 or else (Nkind
(Unit_Node
) = N_Subprogram_Body
1007 and then not Acts_As_Spec
(Unit_Node
))
1009 -- Bodies that are not the main unit are compiled if they are generic
1010 -- or contain generic or inlined units. Their analysis brings in the
1011 -- context of the corresponding spec (unit declaration) which must be
1012 -- removed as well, to return the compilation environment to its
1015 Remove_Context
(Lib_Unit
);
1016 Set_Is_Immediately_Visible
(Defining_Entity
(Unit
(Lib_Unit
)), False);
1019 -- Last step is to deinstall the context we just installed as well as
1020 -- the unit just compiled.
1024 -- If this is the main unit and we are generating code, we must check
1025 -- that all generic units in the context have a body if they need it,
1026 -- even if they have not been instantiated. In the absence of .ali files
1027 -- for generic units, we must force the load of the body, just to
1028 -- produce the proper error if the body is absent. We skip this
1029 -- verification if the main unit itself is generic.
1031 if Get_Cunit_Unit_Number
(N
) = Main_Unit
1032 and then Operating_Mode
= Generate_Code
1033 and then Expander_Active
1035 -- Check whether the source for the body of the unit must be included
1036 -- in a standalone library.
1038 Check_Body_Needed_For_SAL
(Cunit_Entity
(Main_Unit
));
1040 -- Indicate that the main unit is now analyzed, to catch possible
1041 -- circularities between it and generic bodies. Remove main unit from
1042 -- visibility. This might seem superfluous, but the main unit must
1043 -- not be visible in the generic body expansions that follow.
1045 Set_Analyzed
(N
, True);
1046 Set_Is_Immediately_Visible
(Cunit_Entity
(Main_Unit
), False);
1051 Un
: Unit_Number_Type
;
1053 Save_Style_Check
: constant Boolean := Style_Check
;
1054 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
1055 Cunit_Boolean_Restrictions_Save
;
1058 Item
:= First
(Context_Items
(N
));
1059 while Present
(Item
) loop
1061 -- Check for explicit with clause
1063 if Nkind
(Item
) = N_With_Clause
1064 and then not Implicit_With
(Item
)
1066 -- Ada 2005 (AI-50217): Ignore limited-withed units
1068 and then not Limited_Present
(Item
)
1070 Nam
:= Entity
(Name
(Item
));
1072 -- Compile generic subprogram, unless it is intrinsic or
1073 -- imported so no body is required, or generic package body
1074 -- if the package spec requires a body.
1076 if (Is_Generic_Subprogram
(Nam
)
1077 and then not Is_Intrinsic_Subprogram
(Nam
)
1078 and then not Is_Imported
(Nam
))
1079 or else (Ekind
(Nam
) = E_Generic_Package
1080 and then Unit_Requires_Body
(Nam
))
1082 Style_Check
:= False;
1084 if Present
(Renamed_Object
(Nam
)) then
1087 (Load_Name
=> Get_Body_Name
1089 (Unit_Declaration_Node
1090 (Renamed_Object
(Nam
)))),
1098 (Load_Name
=> Get_Body_Name
1099 (Get_Unit_Name
(Item
)),
1106 if Un
= No_Unit
then
1108 ("body of generic unit& not found", Item
, Nam
);
1111 elsif not Analyzed
(Cunit
(Un
))
1112 and then Un
/= Main_Unit
1113 and then not Fatal_Error
(Un
)
1115 Style_Check
:= False;
1116 Semantics
(Cunit
(Un
));
1124 Style_Check
:= Save_Style_Check
;
1125 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
1129 -- Deal with creating elaboration Boolean if needed. We create an
1130 -- elaboration boolean only for units that come from source since
1131 -- units manufactured by the compiler never need elab checks.
1133 if Comes_From_Source
(N
)
1134 and then Nkind_In
(Unit_Node
, N_Package_Declaration
,
1135 N_Generic_Package_Declaration
,
1136 N_Subprogram_Declaration
,
1137 N_Generic_Subprogram_Declaration
)
1140 Loc
: constant Source_Ptr
:= Sloc
(N
);
1141 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Loc
);
1144 Spec_Id
:= Defining_Entity
(Unit_Node
);
1145 Generate_Definition
(Spec_Id
);
1147 -- See if an elaboration entity is required for possible access
1148 -- before elaboration checking. Note that we must allow for this
1149 -- even if -gnatE is not set, since a client may be compiled in
1150 -- -gnatE mode and reference the entity.
1152 -- These entities are also used by the binder to prevent multiple
1153 -- attempts to execute the elaboration code for the library case
1154 -- where the elaboration routine might otherwise be called more
1157 -- Case of units which do not require elaboration checks
1160 -- Pure units do not need checks
1164 -- Preelaborated units do not need checks
1166 or else Is_Preelaborated
(Spec_Id
)
1168 -- No checks needed if pragma Elaborate_Body present
1170 or else Has_Pragma_Elaborate_Body
(Spec_Id
)
1172 -- No checks needed if unit does not require a body
1174 or else not Unit_Requires_Body
(Spec_Id
)
1176 -- No checks needed for predefined files
1178 or else Is_Predefined_File_Name
(Unit_File_Name
(Unum
))
1180 -- No checks required if no separate spec
1182 or else Acts_As_Spec
(N
)
1184 -- This is a case where we only need the entity for
1185 -- checking to prevent multiple elaboration checks.
1187 Set_Elaboration_Entity_Required
(Spec_Id
, False);
1189 -- Case of elaboration entity is required for access before
1190 -- elaboration checking (so certainly we must build it!)
1193 Set_Elaboration_Entity_Required
(Spec_Id
, True);
1196 Build_Elaboration_Entity
(N
, Spec_Id
);
1200 -- Freeze the compilation unit entity. This for sure is needed because
1201 -- of some warnings that can be output (see Freeze_Subprogram), but may
1202 -- in general be required. If freezing actions result, place them in the
1203 -- compilation unit actions list, and analyze them.
1206 L
: constant List_Id
:=
1207 Freeze_Entity
(Cunit_Entity
(Current_Sem_Unit
), N
);
1209 while Is_Non_Empty_List
(L
) loop
1210 Insert_Library_Level_Action
(Remove_Head
(L
));
1216 if Nkind
(Unit_Node
) = N_Package_Declaration
1217 and then Get_Cunit_Unit_Number
(N
) /= Main_Unit
1218 and then Expander_Active
1221 Save_Style_Check
: constant Boolean := Style_Check
;
1222 Save_Warning
: constant Warning_Mode_Type
:= Warning_Mode
;
1223 Options
: Style_Check_Options
;
1226 Save_Style_Check_Options
(Options
);
1227 Reset_Style_Check_Options
;
1228 Opt
.Warning_Mode
:= Suppress
;
1229 Check_Body_For_Inlining
(N
, Defining_Entity
(Unit_Node
));
1231 Reset_Style_Check_Options
;
1232 Set_Style_Check_Options
(Options
);
1233 Style_Check
:= Save_Style_Check
;
1234 Warning_Mode
:= Save_Warning
;
1238 -- If we are generating obsolescent warnings, then here is where we
1239 -- generate them for the with'ed items. The reason for this special
1240 -- processing is that the normal mechanism of generating the warnings
1241 -- for referenced entities does not work for context clause references.
1242 -- That's because when we first analyze the context, it is too early to
1243 -- know if the with'ing unit is itself obsolescent (which suppresses
1246 if not GNAT_Mode
and then Warn_On_Obsolescent_Feature
then
1248 -- Push current compilation unit as scope, so that the test for
1249 -- being within an obsolescent unit will work correctly.
1251 Push_Scope
(Defining_Entity
(Unit_Node
));
1253 -- Loop through context items to deal with with clauses
1261 Item
:= First
(Context_Items
(N
));
1262 while Present
(Item
) loop
1263 if Nkind
(Item
) = N_With_Clause
1265 -- Suppress this check in limited-withed units. Further work
1266 -- needed here if we decide to incorporate this check on
1267 -- limited-withed units.
1269 and then not Limited_Present
(Item
)
1272 Ent
:= Entity
(Nam
);
1274 if Is_Obsolescent
(Ent
) then
1275 Output_Obsolescent_Entity_Warnings
(Nam
, Ent
);
1283 -- Remove temporary install of current unit as scope
1287 end Analyze_Compilation_Unit
;
1289 ---------------------
1290 -- Analyze_Context --
1291 ---------------------
1293 procedure Analyze_Context
(N
: Node_Id
) is
1294 Ukind
: constant Node_Kind
:= Nkind
(Unit
(N
));
1298 -- First process all configuration pragmas at the start of the context
1299 -- items. Strictly these are not part of the context clause, but that
1300 -- is where the parser puts them. In any case for sure we must analyze
1301 -- these before analyzing the actual context items, since they can have
1302 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1303 -- be with'ed as a result of changing categorizations in Ada 2005).
1305 Item
:= First
(Context_Items
(N
));
1306 while Present
(Item
)
1307 and then Nkind
(Item
) = N_Pragma
1308 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
1314 -- This is the point at which we capture the configuration settings
1315 -- for the unit. At the moment only the Optimize_Alignment setting
1316 -- needs to be captured. Probably more later ???
1318 if Optimize_Alignment_Local
then
1319 Set_OA_Setting
(Current_Sem_Unit
, 'L');
1321 Set_OA_Setting
(Current_Sem_Unit
, Optimize_Alignment
);
1324 -- Loop through actual context items. This is done in two passes:
1326 -- a) The first pass analyzes non-limited with-clauses and also any
1327 -- configuration pragmas (we need to get the latter analyzed right
1328 -- away, since they can affect processing of subsequent items.
1330 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1332 while Present
(Item
) loop
1334 -- For with clause, analyze the with clause, and then update the
1335 -- version, since we are dependent on a unit that we with.
1337 if Nkind
(Item
) = N_With_Clause
1338 and then not Limited_Present
(Item
)
1340 -- Skip analyzing with clause if no unit, nothing to do (this
1341 -- happens for a with that references a non-existent unit). Skip
1342 -- as well if this is a with_clause for the main unit, which
1343 -- happens if a subunit has a useless with_clause on its parent.
1345 if Present
(Library_Unit
(Item
)) then
1346 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
) then
1350 Set_Entity
(Name
(Item
), Cunit_Entity
(Current_Sem_Unit
));
1354 if not Implicit_With
(Item
) then
1355 Version_Update
(N
, Library_Unit
(Item
));
1358 -- Skip pragmas. Configuration pragmas at the start were handled in
1359 -- the loop above, and remaining pragmas are not processed until we
1360 -- actually install the context (see Install_Context). We delay the
1361 -- analysis of these pragmas to make sure that we have installed all
1362 -- the implicit with's on parent units.
1364 -- Skip use clauses at this stage, since we don't want to do any
1365 -- installing of potentially use-visible entities until we
1366 -- actually install the complete context (in Install_Context).
1367 -- Otherwise things can get installed in the wrong context.
1376 -- Second pass: examine all limited_with clauses. All other context
1377 -- items are ignored in this pass.
1379 Item
:= First
(Context_Items
(N
));
1380 while Present
(Item
) loop
1381 if Nkind
(Item
) = N_With_Clause
1382 and then Limited_Present
(Item
)
1384 -- No need to check errors on implicitly generated limited-with
1387 if not Implicit_With
(Item
) then
1389 -- Verify that the illegal contexts given in 10.1.2 (18/2) are
1390 -- properly rejected, including renaming declarations.
1392 if not Nkind_In
(Ukind
, N_Package_Declaration
,
1393 N_Subprogram_Declaration
)
1394 and then Ukind
not in N_Generic_Declaration
1395 and then Ukind
not in N_Generic_Instantiation
1397 Error_Msg_N
("limited with_clause not allowed here", Item
);
1399 -- Check wrong use of a limited with clause applied to the
1400 -- compilation unit containing the limited-with clause.
1402 -- limited with P.Q;
1403 -- package P.Q is ...
1405 elsif Unit
(Library_Unit
(Item
)) = Unit
(N
) then
1406 Error_Msg_N
("wrong use of limited-with clause", Item
);
1408 -- Check wrong use of limited-with clause applied to some
1409 -- immediate ancestor.
1411 elsif Is_Child_Spec
(Unit
(N
)) then
1413 Lib_U
: constant Entity_Id
:= Unit
(Library_Unit
(Item
));
1417 P
:= Parent_Spec
(Unit
(N
));
1419 if Unit
(P
) = Lib_U
then
1420 Error_Msg_N
("limited with_clause cannot "
1421 & "name ancestor", Item
);
1425 exit when not Is_Child_Spec
(Unit
(P
));
1426 P
:= Parent_Spec
(Unit
(P
));
1431 -- Check if the limited-withed unit is already visible through
1432 -- some context clause of the current compilation unit or some
1433 -- ancestor of the current compilation unit.
1436 Lim_Unit_Name
: constant Node_Id
:= Name
(Item
);
1437 Comp_Unit
: Node_Id
;
1439 Unit_Name
: Node_Id
;
1444 It
:= First
(Context_Items
(Comp_Unit
));
1445 while Present
(It
) loop
1447 and then Nkind
(It
) = N_With_Clause
1448 and then not Limited_Present
(It
)
1450 Nkind_In
(Unit
(Library_Unit
(It
)),
1451 N_Package_Declaration
,
1452 N_Package_Renaming_Declaration
)
1454 if Nkind
(Unit
(Library_Unit
(It
))) =
1455 N_Package_Declaration
1457 Unit_Name
:= Name
(It
);
1459 Unit_Name
:= Name
(Unit
(Library_Unit
(It
)));
1462 -- Check if the named package (or some ancestor)
1463 -- leaves visible the full-view of the unit given
1464 -- in the limited-with clause
1467 if Designate_Same_Unit
(Lim_Unit_Name
,
1470 Error_Msg_Sloc
:= Sloc
(It
);
1472 ("simultaneous visibility of limited "
1473 & "and unlimited views not allowed",
1476 ("\unlimited view visible through "
1477 & "context clause #",
1481 elsif Nkind
(Unit_Name
) = N_Identifier
then
1485 Unit_Name
:= Prefix
(Unit_Name
);
1492 exit when not Is_Child_Spec
(Unit
(Comp_Unit
));
1494 Comp_Unit
:= Parent_Spec
(Unit
(Comp_Unit
));
1499 -- Skip analyzing with clause if no unit, see above
1501 if Present
(Library_Unit
(Item
)) then
1505 -- A limited_with does not impose an elaboration order, but
1506 -- there is a semantic dependency for recompilation purposes.
1508 if not Implicit_With
(Item
) then
1509 Version_Update
(N
, Library_Unit
(Item
));
1512 -- Pragmas and use clauses and with clauses other than limited
1513 -- with's are ignored in this pass through the context items.
1521 end Analyze_Context
;
1523 -------------------------------
1524 -- Analyze_Package_Body_Stub --
1525 -------------------------------
1527 procedure Analyze_Package_Body_Stub
(N
: Node_Id
) is
1528 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1532 -- The package declaration must be in the current declarative part
1534 Check_Stub_Level
(N
);
1535 Nam
:= Current_Entity_In_Scope
(Id
);
1537 if No
(Nam
) or else not Is_Package_Or_Generic_Package
(Nam
) then
1538 Error_Msg_N
("missing specification for package stub", N
);
1540 elsif Has_Completion
(Nam
)
1541 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(Nam
)))
1543 Error_Msg_N
("duplicate or redundant stub for package", N
);
1546 -- Indicate that the body of the package exists. If we are doing
1547 -- only semantic analysis, the stub stands for the body. If we are
1548 -- generating code, the existence of the body will be confirmed
1549 -- when we load the proper body.
1551 Set_Has_Completion
(Nam
);
1552 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1553 Generate_Reference
(Nam
, Id
, 'b');
1554 Analyze_Proper_Body
(N
, Nam
);
1556 end Analyze_Package_Body_Stub
;
1558 -------------------------
1559 -- Analyze_Proper_Body --
1560 -------------------------
1562 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
) is
1563 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
1564 Unum
: Unit_Number_Type
;
1566 procedure Optional_Subunit
;
1567 -- This procedure is called when the main unit is a stub, or when we
1568 -- are not generating code. In such a case, we analyze the subunit if
1569 -- present, which is user-friendly and in fact required for ASIS, but
1570 -- we don't complain if the subunit is missing.
1572 ----------------------
1573 -- Optional_Subunit --
1574 ----------------------
1576 procedure Optional_Subunit
is
1577 Comp_Unit
: Node_Id
;
1580 -- Try to load subunit, but ignore any errors that occur during the
1581 -- loading of the subunit, by using the special feature in Errout to
1582 -- ignore all errors. Note that Fatal_Error will still be set, so we
1583 -- will be able to check for this case below.
1585 if not ASIS_Mode
then
1586 Ignore_Errors_Enable
:= Ignore_Errors_Enable
+ 1;
1591 (Load_Name
=> Subunit_Name
,
1596 if not ASIS_Mode
then
1597 Ignore_Errors_Enable
:= Ignore_Errors_Enable
- 1;
1600 -- All done if we successfully loaded the subunit
1603 and then (not Fatal_Error
(Unum
) or else Try_Semantics
)
1605 Comp_Unit
:= Cunit
(Unum
);
1607 -- If the file was empty or seriously mangled, the unit itself may
1610 if No
(Unit
(Comp_Unit
)) then
1612 ("subunit does not contain expected proper body", N
);
1614 elsif Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1616 ("expected SEPARATE subunit, found child unit",
1617 Cunit_Entity
(Unum
));
1619 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1620 Analyze_Subunit
(Comp_Unit
);
1621 Set_Library_Unit
(N
, Comp_Unit
);
1624 elsif Unum
= No_Unit
1625 and then Present
(Nam
)
1627 if Is_Protected_Type
(Nam
) then
1628 Set_Corresponding_Body
(Parent
(Nam
), Defining_Identifier
(N
));
1630 Set_Corresponding_Body
(
1631 Unit_Declaration_Node
(Nam
), Defining_Identifier
(N
));
1634 end Optional_Subunit
;
1636 -- Start of processing for Analyze_Proper_Body
1639 -- If the subunit is already loaded, it means that the main unit is a
1640 -- subunit, and that the current unit is one of its parents which was
1641 -- being analyzed to provide the needed context for the analysis of the
1642 -- subunit. In this case we analyze the subunit and continue with the
1643 -- parent, without looking a subsequent subunits.
1645 if Is_Loaded
(Subunit_Name
) then
1647 -- If the proper body is already linked to the stub node, the stub is
1648 -- in a generic unit and just needs analyzing.
1650 if Present
(Library_Unit
(N
)) then
1651 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1652 Analyze_Subunit
(Library_Unit
(N
));
1654 -- Otherwise we must load the subunit and link to it
1657 -- Load the subunit, this must work, since we originally loaded
1658 -- the subunit earlier on. So this will not really load it, just
1659 -- give access to it.
1663 (Load_Name
=> Subunit_Name
,
1668 -- And analyze the subunit in the parent context (note that we
1669 -- do not call Semantics, since that would remove the parent
1670 -- context). Because of this, we have to manually reset the
1671 -- compiler state to Analyzing since it got destroyed by Load.
1673 if Unum
/= No_Unit
then
1674 Compiler_State
:= Analyzing
;
1676 -- Check that the proper body is a subunit and not a child
1677 -- unit. If the unit was previously loaded, the error will
1678 -- have been emitted when copying the generic node, so we
1679 -- just return to avoid cascaded errors.
1681 if Nkind
(Unit
(Cunit
(Unum
))) /= N_Subunit
then
1685 Set_Corresponding_Stub
(Unit
(Cunit
(Unum
)), N
);
1686 Analyze_Subunit
(Cunit
(Unum
));
1687 Set_Library_Unit
(N
, Cunit
(Unum
));
1691 -- If the main unit is a subunit, then we are just performing semantic
1692 -- analysis on that subunit, and any other subunits of any parent unit
1693 -- should be ignored, except that if we are building trees for ASIS
1694 -- usage we want to annotate the stub properly.
1696 elsif Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
1697 and then Subunit_Name
/= Unit_Name
(Main_Unit
)
1703 -- But before we return, set the flag for unloaded subunits. This
1704 -- will suppress junk warnings of variables in the same declarative
1705 -- part (or a higher level one) that are in danger of looking unused
1706 -- when in fact there might be a declaration in the subunit that we
1707 -- do not intend to load.
1709 Unloaded_Subunits
:= True;
1712 -- If the subunit is not already loaded, and we are generating code,
1713 -- then this is the case where compilation started from the parent, and
1714 -- we are generating code for an entire subunit tree. In that case we
1715 -- definitely need to load the subunit.
1717 -- In order to continue the analysis with the rest of the parent,
1718 -- and other subunits, we load the unit without requiring its
1719 -- presence, and emit a warning if not found, rather than terminating
1720 -- the compilation abruptly, as for other missing file problems.
1722 elsif Original_Operating_Mode
= Generate_Code
then
1724 -- If the proper body is already linked to the stub node, the stub is
1725 -- in a generic unit and just needs analyzing.
1727 -- We update the version. Although we are not strictly technically
1728 -- semantically dependent on the subunit, given our approach of macro
1729 -- substitution of subunits, it makes sense to include it in the
1730 -- version identification.
1732 if Present
(Library_Unit
(N
)) then
1733 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1734 Analyze_Subunit
(Library_Unit
(N
));
1735 Version_Update
(Cunit
(Main_Unit
), Library_Unit
(N
));
1737 -- Otherwise we must load the subunit and link to it
1740 -- Make sure that, if the subunit is preprocessed and -gnateG is
1741 -- specified, the preprocessed file will be written.
1743 Lib
.Analysing_Subunit_Of_Main
:= True;
1746 (Load_Name
=> Subunit_Name
,
1750 Lib
.Analysing_Subunit_Of_Main
:= False;
1752 -- Give message if we did not get the unit Emit warning even if
1753 -- missing subunit is not within main unit, to simplify debugging.
1755 if Original_Operating_Mode
= Generate_Code
1756 and then Unum
= No_Unit
1758 Error_Msg_Unit_1
:= Subunit_Name
;
1760 Get_File_Name
(Subunit_Name
, Subunit
=> True);
1762 ("subunit$$ in file{ not found?!!", N
);
1763 Subunits_Missing
:= True;
1766 -- Load_Unit may reset Compiler_State, since it may have been
1767 -- necessary to parse an additional units, so we make sure that
1768 -- we reset it to the Analyzing state.
1770 Compiler_State
:= Analyzing
;
1772 if Unum
/= No_Unit
then
1773 if Debug_Flag_L
then
1774 Write_Str
("*** Loaded subunit from stub. Analyze");
1779 Comp_Unit
: constant Node_Id
:= Cunit
(Unum
);
1782 -- Check for child unit instead of subunit
1784 if Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1786 ("expected SEPARATE subunit, found child unit",
1787 Cunit_Entity
(Unum
));
1789 -- OK, we have a subunit
1792 -- Set corresponding stub (even if errors)
1794 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1796 -- Collect SCO information for loaded subunit if we are
1797 -- in the main unit).
1801 In_Extended_Main_Source_Unit
1802 (Cunit_Entity
(Current_Sem_Unit
))
1807 -- Analyze the unit if semantics active
1809 if not Fatal_Error
(Unum
) or else Try_Semantics
then
1810 Analyze_Subunit
(Comp_Unit
);
1813 -- Set the library unit pointer in any case
1815 Set_Library_Unit
(N
, Comp_Unit
);
1817 -- We update the version. Although we are not technically
1818 -- semantically dependent on the subunit, given our
1819 -- approach of macro substitution of subunits, it makes
1820 -- sense to include it in the version identification.
1822 Version_Update
(Cunit
(Main_Unit
), Comp_Unit
);
1828 -- The remaining case is when the subunit is not already loaded and we
1829 -- are not generating code. In this case we are just performing semantic
1830 -- analysis on the parent, and we are not interested in the subunit. For
1831 -- subprograms, analyze the stub as a body. For other entities the stub
1832 -- has already been marked as completed.
1837 end Analyze_Proper_Body
;
1839 ----------------------------------
1840 -- Analyze_Protected_Body_Stub --
1841 ----------------------------------
1843 procedure Analyze_Protected_Body_Stub
(N
: Node_Id
) is
1844 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
1847 Check_Stub_Level
(N
);
1849 -- First occurrence of name may have been as an incomplete type
1851 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
1852 Nam
:= Full_View
(Nam
);
1856 or else not Is_Protected_Type
(Etype
(Nam
))
1858 Error_Msg_N
("missing specification for Protected body", N
);
1860 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1861 Set_Has_Completion
(Etype
(Nam
));
1862 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
1863 Analyze_Proper_Body
(N
, Etype
(Nam
));
1865 end Analyze_Protected_Body_Stub
;
1867 ----------------------------------
1868 -- Analyze_Subprogram_Body_Stub --
1869 ----------------------------------
1871 -- A subprogram body stub can appear with or without a previous spec. If
1872 -- there is one, then the analysis of the body will find it and verify
1873 -- conformance. The formals appearing in the specification of the stub play
1874 -- no role, except for requiring an additional conformance check. If there
1875 -- is no previous subprogram declaration, the stub acts as a spec, and
1876 -- provides the defining entity for the subprogram.
1878 procedure Analyze_Subprogram_Body_Stub
(N
: Node_Id
) is
1882 Check_Stub_Level
(N
);
1884 -- Verify that the identifier for the stub is unique within this
1885 -- declarative part.
1887 if Nkind_In
(Parent
(N
), N_Block_Statement
,
1891 Decl
:= First
(Declarations
(Parent
(N
)));
1892 while Present
(Decl
)
1895 if Nkind
(Decl
) = N_Subprogram_Body_Stub
1896 and then (Chars
(Defining_Unit_Name
(Specification
(Decl
))) =
1897 Chars
(Defining_Unit_Name
(Specification
(N
))))
1899 Error_Msg_N
("identifier for stub is not unique", N
);
1906 -- Treat stub as a body, which checks conformance if there is a previous
1907 -- declaration, or else introduces entity and its signature.
1909 Analyze_Subprogram_Body
(N
);
1910 Analyze_Proper_Body
(N
, Empty
);
1911 end Analyze_Subprogram_Body_Stub
;
1913 ---------------------
1914 -- Analyze_Subunit --
1915 ---------------------
1917 -- A subunit is compiled either by itself (for semantic checking) or as
1918 -- part of compiling the parent (for code generation). In either case, by
1919 -- the time we actually process the subunit, the parent has already been
1920 -- installed and analyzed. The node N is a compilation unit, whose context
1921 -- needs to be treated here, because we come directly here from the parent
1922 -- without calling Analyze_Compilation_Unit.
1924 -- The compilation context includes the explicit context of the subunit,
1925 -- and the context of the parent, together with the parent itself. In order
1926 -- to compile the current context, we remove the one inherited from the
1927 -- parent, in order to have a clean visibility table. We restore the parent
1928 -- context before analyzing the proper body itself. On exit, we remove only
1929 -- the explicit context of the subunit.
1931 procedure Analyze_Subunit
(N
: Node_Id
) is
1932 Lib_Unit
: constant Node_Id
:= Library_Unit
(N
);
1933 Par_Unit
: constant Entity_Id
:= Current_Scope
;
1935 Lib_Spec
: Node_Id
:= Library_Unit
(Lib_Unit
);
1936 Num_Scopes
: Int
:= 0;
1937 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
1938 Enclosing_Child
: Entity_Id
:= Empty
;
1939 Svg
: constant Suppress_Array
:= Scope_Suppress
;
1941 procedure Analyze_Subunit_Context
;
1942 -- Capture names in use clauses of the subunit. This must be done before
1943 -- re-installing parent declarations, because items in the context must
1944 -- not be hidden by declarations local to the parent.
1946 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
);
1947 -- Recursive procedure to restore scope of all ancestors of subunit,
1948 -- from outermost in. If parent is not a subunit, the call to install
1949 -- context installs context of spec and (if parent is a child unit) the
1950 -- context of its parents as well. It is confusing that parents should
1951 -- be treated differently in both cases, but the semantics are just not
1954 procedure Re_Install_Use_Clauses
;
1955 -- As part of the removal of the parent scope, the use clauses are
1956 -- removed, to be reinstalled when the context of the subunit has been
1957 -- analyzed. Use clauses may also have been affected by the analysis of
1958 -- the context of the subunit, so they have to be applied again, to
1959 -- insure that the compilation environment of the rest of the parent
1960 -- unit is identical.
1962 procedure Remove_Scope
;
1963 -- Remove current scope from scope stack, and preserve the list of use
1964 -- clauses in it, to be reinstalled after context is analyzed.
1966 -----------------------------
1967 -- Analyze_Subunit_Context --
1968 -----------------------------
1970 procedure Analyze_Subunit_Context
is
1973 Unit_Name
: Entity_Id
;
1976 Analyze_Context
(N
);
1978 -- Make withed units immediately visible. If child unit, make the
1979 -- ultimate parent immediately visible.
1981 Item
:= First
(Context_Items
(N
));
1982 while Present
(Item
) loop
1983 if Nkind
(Item
) = N_With_Clause
then
1985 -- Protect frontend against previous errors in context clauses
1987 if Nkind
(Name
(Item
)) /= N_Selected_Component
then
1988 if Error_Posted
(Item
) then
1992 Unit_Name
:= Entity
(Name
(Item
));
1993 while Is_Child_Unit
(Unit_Name
) loop
1994 Set_Is_Visible_Child_Unit
(Unit_Name
);
1995 Unit_Name
:= Scope
(Unit_Name
);
1998 if not Is_Immediately_Visible
(Unit_Name
) then
1999 Set_Is_Immediately_Visible
(Unit_Name
);
2000 Set_Context_Installed
(Item
);
2005 elsif Nkind
(Item
) = N_Use_Package_Clause
then
2006 Nam
:= First
(Names
(Item
));
2007 while Present
(Nam
) loop
2012 elsif Nkind
(Item
) = N_Use_Type_Clause
then
2013 Nam
:= First
(Subtype_Marks
(Item
));
2014 while Present
(Nam
) loop
2023 -- Reset visibility of withed units. They will be made visible again
2024 -- when we install the subunit context.
2026 Item
:= First
(Context_Items
(N
));
2027 while Present
(Item
) loop
2028 if Nkind
(Item
) = N_With_Clause
2030 -- Protect frontend against previous errors in context clauses
2032 and then Nkind
(Name
(Item
)) /= N_Selected_Component
2033 and then not Error_Posted
(Item
)
2035 Unit_Name
:= Entity
(Name
(Item
));
2036 while Is_Child_Unit
(Unit_Name
) loop
2037 Set_Is_Visible_Child_Unit
(Unit_Name
, False);
2038 Unit_Name
:= Scope
(Unit_Name
);
2041 if Context_Installed
(Item
) then
2042 Set_Is_Immediately_Visible
(Unit_Name
, False);
2043 Set_Context_Installed
(Item
, False);
2049 end Analyze_Subunit_Context
;
2051 ------------------------
2052 -- Re_Install_Parents --
2053 ------------------------
2055 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
) is
2059 if Nkind
(Unit
(L
)) = N_Subunit
then
2060 Re_Install_Parents
(Library_Unit
(L
), Scope
(Scop
));
2063 Install_Context
(L
);
2065 -- If the subunit occurs within a child unit, we must restore the
2066 -- immediate visibility of any siblings that may occur in context.
2068 if Present
(Enclosing_Child
) then
2069 Install_Siblings
(Enclosing_Child
, L
);
2074 if Scop
/= Par_Unit
then
2075 Set_Is_Immediately_Visible
(Scop
);
2078 -- Make entities in scope visible again. For child units, restore
2079 -- visibility only if they are actually in context.
2081 E
:= First_Entity
(Current_Scope
);
2082 while Present
(E
) loop
2083 if not Is_Child_Unit
(E
)
2084 or else Is_Visible_Child_Unit
(E
)
2086 Set_Is_Immediately_Visible
(E
);
2092 -- A subunit appears within a body, and for a nested subunits all the
2093 -- parents are bodies. Restore full visibility of their private
2096 if Is_Package_Or_Generic_Package
(Scop
) then
2097 Set_In_Package_Body
(Scop
);
2098 Install_Private_Declarations
(Scop
);
2100 end Re_Install_Parents
;
2102 ----------------------------
2103 -- Re_Install_Use_Clauses --
2104 ----------------------------
2106 procedure Re_Install_Use_Clauses
is
2109 for J
in reverse 1 .. Num_Scopes
loop
2110 U
:= Use_Clauses
(J
);
2111 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:= U
;
2112 Install_Use_Clauses
(U
, Force_Installation
=> True);
2114 end Re_Install_Use_Clauses
;
2120 procedure Remove_Scope
is
2124 Num_Scopes
:= Num_Scopes
+ 1;
2125 Use_Clauses
(Num_Scopes
) :=
2126 Scope_Stack
.Table
(Scope_Stack
.Last
).First_Use_Clause
;
2128 E
:= First_Entity
(Current_Scope
);
2129 while Present
(E
) loop
2130 Set_Is_Immediately_Visible
(E
, False);
2134 if Is_Child_Unit
(Current_Scope
) then
2135 Enclosing_Child
:= Current_Scope
;
2141 -- Start of processing for Analyze_Subunit
2146 Nam
: Node_Id
:= Name
(Unit
(N
));
2149 if Nkind
(Nam
) = N_Selected_Component
then
2150 Nam
:= Selector_Name
(Nam
);
2153 Check_Identifier
(Nam
, Par_Unit
);
2157 if not Is_Empty_List
(Context_Items
(N
)) then
2159 -- Save current use clauses
2162 Remove_Context
(Lib_Unit
);
2164 -- Now remove parents and their context, including enclosing subunits
2165 -- and the outer parent body which is not a subunit.
2167 if Present
(Lib_Spec
) then
2168 Remove_Context
(Lib_Spec
);
2170 while Nkind
(Unit
(Lib_Spec
)) = N_Subunit
loop
2171 Lib_Spec
:= Library_Unit
(Lib_Spec
);
2173 Remove_Context
(Lib_Spec
);
2176 if Nkind
(Unit
(Lib_Unit
)) = N_Subunit
then
2180 if Nkind
(Unit
(Lib_Spec
)) = N_Package_Body
then
2181 Remove_Context
(Library_Unit
(Lib_Spec
));
2185 Set_Is_Immediately_Visible
(Par_Unit
, False);
2187 Analyze_Subunit_Context
;
2189 Re_Install_Parents
(Lib_Unit
, Par_Unit
);
2190 Set_Is_Immediately_Visible
(Par_Unit
);
2192 -- If the context includes a child unit of the parent of the subunit,
2193 -- the parent will have been removed from visibility, after compiling
2194 -- that cousin in the context. The visibility of the parent must be
2195 -- restored now. This also applies if the context includes another
2196 -- subunit of the same parent which in turn includes a child unit in
2199 if Is_Package_Or_Generic_Package
(Par_Unit
) then
2200 if not Is_Immediately_Visible
(Par_Unit
)
2201 or else (Present
(First_Entity
(Par_Unit
))
2202 and then not Is_Immediately_Visible
2203 (First_Entity
(Par_Unit
)))
2205 Set_Is_Immediately_Visible
(Par_Unit
);
2206 Install_Visible_Declarations
(Par_Unit
);
2207 Install_Private_Declarations
(Par_Unit
);
2211 Re_Install_Use_Clauses
;
2212 Install_Context
(N
);
2214 -- Restore state of suppress flags for current body
2216 Scope_Suppress
:= Svg
;
2218 -- If the subunit is within a child unit, then siblings of any parent
2219 -- unit that appear in the context clause of the subunit must also be
2220 -- made immediately visible.
2222 if Present
(Enclosing_Child
) then
2223 Install_Siblings
(Enclosing_Child
, N
);
2227 Analyze
(Proper_Body
(Unit
(N
)));
2230 -- The subunit may contain a with_clause on a sibling of some ancestor.
2231 -- Removing the context will remove from visibility those ancestor child
2232 -- units, which must be restored to the visibility they have in the
2235 if Present
(Enclosing_Child
) then
2241 and then Is_Child_Unit
(C
)
2243 Set_Is_Immediately_Visible
(C
);
2244 Set_Is_Visible_Child_Unit
(C
);
2249 end Analyze_Subunit
;
2251 ----------------------------
2252 -- Analyze_Task_Body_Stub --
2253 ----------------------------
2255 procedure Analyze_Task_Body_Stub
(N
: Node_Id
) is
2256 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
2257 Loc
: constant Source_Ptr
:= Sloc
(N
);
2260 Check_Stub_Level
(N
);
2262 -- First occurrence of name may have been as an incomplete type
2264 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
2265 Nam
:= Full_View
(Nam
);
2268 if No
(Nam
) or else not Is_Task_Type
(Etype
(Nam
)) then
2269 Error_Msg_N
("missing specification for task body", N
);
2271 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
2272 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
2274 -- Check for duplicate stub, if so give message and terminate
2276 if Has_Completion
(Etype
(Nam
)) then
2277 Error_Msg_N
("duplicate stub for task", N
);
2280 Set_Has_Completion
(Etype
(Nam
));
2283 Analyze_Proper_Body
(N
, Etype
(Nam
));
2285 -- Set elaboration flag to indicate that entity is callable. This
2286 -- cannot be done in the expansion of the body itself, because the
2287 -- proper body is not in a declarative part. This is only done if
2288 -- expansion is active, because the context may be generic and the
2289 -- flag not defined yet.
2291 if Expander_Active
then
2293 Make_Assignment_Statement
(Loc
,
2295 Make_Identifier
(Loc
,
2296 New_External_Name
(Chars
(Etype
(Nam
)), 'E')),
2297 Expression
=> New_Reference_To
(Standard_True
, Loc
)));
2300 end Analyze_Task_Body_Stub
;
2302 -------------------------
2303 -- Analyze_With_Clause --
2304 -------------------------
2306 -- Analyze the declaration of a unit in a with clause. At end, label the
2307 -- with clause with the defining entity for the unit.
2309 procedure Analyze_With_Clause
(N
: Node_Id
) is
2311 -- Retrieve the original kind of the unit node, before analysis. If it
2312 -- is a subprogram instantiation, its analysis below will rewrite the
2313 -- node as the declaration of the wrapper package. If the same
2314 -- instantiation appears indirectly elsewhere in the context, it will
2315 -- have been analyzed already.
2317 Unit_Kind
: constant Node_Kind
:=
2318 Nkind
(Original_Node
(Unit
(Library_Unit
(N
))));
2319 Nam
: constant Node_Id
:= Name
(N
);
2321 Par_Name
: Entity_Id
;
2326 -- Set True if the unit currently being compiled is an internal unit
2328 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
2329 Save_C_Restrict
: Save_Cunit_Boolean_Restrictions
;
2332 U
:= Unit
(Library_Unit
(N
));
2334 -- If this is an internal unit which is a renaming, then this is a
2335 -- violation of No_Obsolescent_Features.
2337 -- Note: this is not quite right if the user defines one of these units
2338 -- himself, but that's a marginal case, and fixing it is hard ???
2340 if Restriction_Check_Required
(No_Obsolescent_Features
) then
2342 F
: constant File_Name_Type
:=
2343 Unit_File_Name
(Get_Source_Unit
(U
));
2345 if Is_Predefined_File_Name
(F
, Renamings_Included
=> True)
2347 Is_Predefined_File_Name
(F
, Renamings_Included
=> False)
2349 Check_Restriction
(No_Obsolescent_Features
, N
);
2354 -- Save current restriction set, does not apply to with'ed unit
2356 Save_C_Restrict
:= Cunit_Boolean_Restrictions_Save
;
2358 -- Several actions are skipped for dummy packages (those supplied for
2359 -- with's where no matching file could be found). Such packages are
2360 -- identified by the Sloc value being set to No_Location.
2362 if Limited_Present
(N
) then
2364 -- Ada 2005 (AI-50217): Build visibility structures but do not
2365 -- analyze the unit.
2367 if Sloc
(U
) /= No_Location
then
2368 Build_Limited_Views
(N
);
2374 -- We reset ordinary style checking during the analysis of a with'ed
2375 -- unit, but we do NOT reset GNAT special analysis mode (the latter
2376 -- definitely *does* apply to with'ed units).
2378 if not GNAT_Mode
then
2379 Style_Check
:= False;
2382 -- If the library unit is a predefined unit, and we are in high
2383 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
2384 -- for the analysis of the with'ed unit. This mode does not prevent
2385 -- explicit with'ing of run-time units.
2387 if Configurable_Run_Time_Mode
2388 and then Is_Predefined_File_Name
(Unit_File_Name
(Get_Source_Unit
(U
)))
2390 Configurable_Run_Time_Mode
:= False;
2391 Semantics
(Library_Unit
(N
));
2392 Configurable_Run_Time_Mode
:= True;
2395 Semantics
(Library_Unit
(N
));
2398 Intunit
:= Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
));
2400 if Sloc
(U
) /= No_Location
then
2402 -- Check restrictions, except that we skip the check if this is an
2403 -- internal unit unless we are compiling the internal unit as the
2404 -- main unit. We also skip this for dummy packages.
2406 Check_Restriction_No_Dependence
(Nam
, N
);
2408 if not Intunit
or else Current_Sem_Unit
= Main_Unit
then
2409 Check_Restricted_Unit
(Unit_Name
(Get_Source_Unit
(U
)), N
);
2412 -- Deal with special case of GNAT.Current_Exceptions which interacts
2413 -- with the optimization of local raise statements into gotos.
2415 if Nkind
(Nam
) = N_Selected_Component
2416 and then Nkind
(Prefix
(Nam
)) = N_Identifier
2417 and then Chars
(Prefix
(Nam
)) = Name_Gnat
2418 and then (Chars
(Selector_Name
(Nam
)) = Name_Most_Recent_Exception
2420 Chars
(Selector_Name
(Nam
)) = Name_Exception_Traces
)
2422 Check_Restriction
(No_Exception_Propagation
, N
);
2423 Special_Exception_Package_Used
:= True;
2426 -- Check for inappropriate with of internal implementation unit if we
2427 -- are not compiling an internal unit. We do not issue this message
2428 -- for implicit with's generated by the compiler itself.
2430 if Implementation_Unit_Warnings
2431 and then not Intunit
2432 and then not Implicit_With
(N
)
2435 U_Kind
: constant Kind_Of_Unit
:=
2436 Get_Kind_Of_Unit
(Get_Source_Unit
(U
));
2439 if U_Kind
= Implementation_Unit
then
2440 Error_Msg_F
("& is an internal 'G'N'A'T unit?", Name
(N
));
2442 -- Add alternative name if available, otherwise issue a
2443 -- general warning message.
2445 if Error_Msg_Strlen
/= 0 then
2446 Error_Msg_F
("\use ""~"" instead", Name
(N
));
2449 ("\use of this unit is non-portable " &
2450 "and version-dependent?", Name
(N
));
2453 elsif U_Kind
= Ada_2005_Unit
2454 and then Ada_Version
< Ada_2005
2455 and then Warn_On_Ada_2005_Compatibility
2457 Error_Msg_N
("& is an Ada 2005 unit?", Name
(N
));
2459 elsif U_Kind
= Ada_2012_Unit
2460 and then Ada_Version
< Ada_2012
2461 and then Warn_On_Ada_2012_Compatibility
2463 Error_Msg_N
("& is an Ada 2012 unit?", Name
(N
));
2469 -- Semantic analysis of a generic unit is performed on a copy of
2470 -- the original tree. Retrieve the entity on which semantic info
2471 -- actually appears.
2473 if Unit_Kind
in N_Generic_Declaration
then
2474 E_Name
:= Defining_Entity
(U
);
2476 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2477 -- the case of an instantiation, semantic analysis above will have
2478 -- replaced the unit by its instantiated version. If the instance body
2479 -- has been generated, the instance now denotes the body entity. For
2480 -- visibility purposes we need the entity of its spec.
2482 elsif (Unit_Kind
= N_Package_Instantiation
2483 or else Nkind
(Original_Node
(Unit
(Library_Unit
(N
)))) =
2484 N_Package_Instantiation
)
2485 and then Nkind
(U
) = N_Package_Body
2487 E_Name
:= Corresponding_Spec
(U
);
2489 elsif Unit_Kind
= N_Package_Instantiation
2490 and then Nkind
(U
) = N_Package_Instantiation
2491 and then Present
(Instance_Spec
(U
))
2493 -- If the instance has not been rewritten as a package declaration,
2494 -- then it appeared already in a previous with clause. Retrieve
2495 -- the entity from the previous instance.
2497 E_Name
:= Defining_Entity
(Specification
(Instance_Spec
(U
)));
2499 elsif Unit_Kind
in N_Subprogram_Instantiation
then
2501 -- The visible subprogram is created during instantiation, and is
2502 -- an attribute of the wrapper package. We retrieve the wrapper
2503 -- package directly from the instantiation node. If the instance
2504 -- is inlined the unit is still an instantiation. Otherwise it has
2505 -- been rewritten as the declaration of the wrapper itself.
2507 if Nkind
(U
) in N_Subprogram_Instantiation
then
2510 (Defining_Entity
(Specification
(Instance_Spec
(U
))));
2512 E_Name
:= Related_Instance
(Defining_Entity
(U
));
2515 elsif Unit_Kind
= N_Package_Renaming_Declaration
2516 or else Unit_Kind
in N_Generic_Renaming_Declaration
2518 E_Name
:= Defining_Entity
(U
);
2520 elsif Unit_Kind
= N_Subprogram_Body
2521 and then Nkind
(Name
(N
)) = N_Selected_Component
2522 and then not Acts_As_Spec
(Library_Unit
(N
))
2524 -- For a child unit that has no spec, one has been created and
2525 -- analyzed. The entity required is that of the spec.
2527 E_Name
:= Corresponding_Spec
(U
);
2530 E_Name
:= Defining_Entity
(U
);
2533 if Nkind
(Name
(N
)) = N_Selected_Component
then
2535 -- Child unit in a with clause
2537 Change_Selected_Component_To_Expanded_Name
(Name
(N
));
2540 -- Restore style checks and restrictions
2542 Style_Check
:= Save_Style_Check
;
2543 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
2545 -- Record the reference, but do NOT set the unit as referenced, we want
2546 -- to consider the unit as unreferenced if this is the only reference
2549 Set_Entity_With_Style_Check
(Name
(N
), E_Name
);
2550 Generate_Reference
(E_Name
, Name
(N
), 'w', Set_Ref
=> False);
2552 -- Generate references and check No_Dependence restriction for parents
2554 if Is_Child_Unit
(E_Name
) then
2555 Pref
:= Prefix
(Name
(N
));
2556 Par_Name
:= Scope
(E_Name
);
2557 while Nkind
(Pref
) = N_Selected_Component
loop
2558 Change_Selected_Component_To_Expanded_Name
(Pref
);
2559 Set_Entity_With_Style_Check
(Pref
, Par_Name
);
2561 Generate_Reference
(Par_Name
, Pref
);
2562 Check_Restriction_No_Dependence
(Pref
, N
);
2563 Pref
:= Prefix
(Pref
);
2565 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2566 -- is set to Standard_Standard, and no attempt should be made to
2567 -- further unwind scopes.
2569 if Par_Name
/= Standard_Standard
then
2570 Par_Name
:= Scope
(Par_Name
);
2574 if Present
(Entity
(Pref
))
2575 and then not Analyzed
(Parent
(Parent
(Entity
(Pref
))))
2577 -- If the entity is set without its unit being compiled, the
2578 -- original parent is a renaming, and Par_Name is the renamed
2579 -- entity. For visibility purposes, we need the original entity,
2580 -- which must be analyzed now because Load_Unit directly retrieves
2581 -- the renamed unit, and the renaming declaration itself has not
2584 Analyze
(Parent
(Parent
(Entity
(Pref
))));
2585 pragma Assert
(Renamed_Object
(Entity
(Pref
)) = Par_Name
);
2586 Par_Name
:= Entity
(Pref
);
2589 Set_Entity_With_Style_Check
(Pref
, Par_Name
);
2590 Generate_Reference
(Par_Name
, Pref
);
2593 -- If the withed unit is System, and a system extension pragma is
2594 -- present, compile the extension now, rather than waiting for a
2595 -- visibility check on a specific entity.
2597 if Chars
(E_Name
) = Name_System
2598 and then Scope
(E_Name
) = Standard_Standard
2599 and then Present
(System_Extend_Unit
)
2600 and then Present_System_Aux
(N
)
2602 -- If the extension is not present, an error will have been emitted
2607 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2608 -- to private_with units; they will be made visible later (just before
2609 -- the private part is analyzed)
2611 if Private_Present
(N
) then
2612 Set_Is_Immediately_Visible
(E_Name
, False);
2614 end Analyze_With_Clause
;
2616 ------------------------------
2617 -- Check_Private_Child_Unit --
2618 ------------------------------
2620 procedure Check_Private_Child_Unit
(N
: Node_Id
) is
2621 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2623 Curr_Unit
: Entity_Id
;
2624 Sub_Parent
: Node_Id
;
2625 Priv_Child
: Entity_Id
;
2626 Par_Lib
: Entity_Id
;
2629 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean;
2630 -- Returns true if and only if the library unit is declared with
2631 -- an explicit designation of private.
2633 -----------------------------
2634 -- Is_Private_Library_Unit --
2635 -----------------------------
2637 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean is
2638 Comp_Unit
: constant Node_Id
:= Parent
(Unit_Declaration_Node
(Unit
));
2641 return Private_Present
(Comp_Unit
);
2642 end Is_Private_Library_Unit
;
2644 -- Start of processing for Check_Private_Child_Unit
2647 if Nkind_In
(Lib_Unit
, N_Package_Body
, N_Subprogram_Body
) then
2648 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(N
)));
2649 Par_Lib
:= Curr_Unit
;
2651 elsif Nkind
(Lib_Unit
) = N_Subunit
then
2653 -- The parent is itself a body. The parent entity is to be found in
2654 -- the corresponding spec.
2656 Sub_Parent
:= Library_Unit
(N
);
2657 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(Sub_Parent
)));
2659 -- If the parent itself is a subunit, Curr_Unit is the entity of the
2660 -- enclosing body, retrieve the spec entity which is the proper
2661 -- ancestor we need for the following tests.
2663 if Ekind
(Curr_Unit
) = E_Package_Body
then
2664 Curr_Unit
:= Spec_Entity
(Curr_Unit
);
2667 Par_Lib
:= Curr_Unit
;
2670 Curr_Unit
:= Defining_Entity
(Lib_Unit
);
2672 Par_Lib
:= Curr_Unit
;
2673 Par_Spec
:= Parent_Spec
(Lib_Unit
);
2675 if No
(Par_Spec
) then
2678 Par_Lib
:= Defining_Entity
(Unit
(Par_Spec
));
2682 -- Loop through context items
2684 Item
:= First
(Context_Items
(N
));
2685 while Present
(Item
) loop
2687 -- Ada 2005 (AI-262): Allow private_with of a private child package
2688 -- in public siblings
2690 if Nkind
(Item
) = N_With_Clause
2691 and then not Implicit_With
(Item
)
2692 and then not Limited_Present
(Item
)
2693 and then Is_Private_Descendant
(Entity
(Name
(Item
)))
2695 Priv_Child
:= Entity
(Name
(Item
));
2698 Curr_Parent
: Entity_Id
:= Par_Lib
;
2699 Child_Parent
: Entity_Id
:= Scope
(Priv_Child
);
2700 Prv_Ancestor
: Entity_Id
:= Child_Parent
;
2701 Curr_Private
: Boolean := Is_Private_Library_Unit
(Curr_Unit
);
2704 -- If the child unit is a public child then locate the nearest
2705 -- private ancestor. Child_Parent will then be set to the
2706 -- parent of that ancestor.
2708 if not Is_Private_Library_Unit
(Priv_Child
) then
2709 while Present
(Prv_Ancestor
)
2710 and then not Is_Private_Library_Unit
(Prv_Ancestor
)
2712 Prv_Ancestor
:= Scope
(Prv_Ancestor
);
2715 if Present
(Prv_Ancestor
) then
2716 Child_Parent
:= Scope
(Prv_Ancestor
);
2720 while Present
(Curr_Parent
)
2721 and then Curr_Parent
/= Standard_Standard
2722 and then Curr_Parent
/= Child_Parent
2725 Curr_Private
or else Is_Private_Library_Unit
(Curr_Parent
);
2726 Curr_Parent
:= Scope
(Curr_Parent
);
2729 if No
(Curr_Parent
) then
2730 Curr_Parent
:= Standard_Standard
;
2733 if Curr_Parent
/= Child_Parent
then
2734 if Ekind
(Priv_Child
) = E_Generic_Package
2735 and then Chars
(Priv_Child
) in Text_IO_Package_Name
2736 and then Chars
(Scope
(Scope
(Priv_Child
))) = Name_Ada
2739 ("& is a nested package, not a compilation unit",
2740 Name
(Item
), Priv_Child
);
2744 ("unit in with clause is private child unit!", Item
);
2746 ("\current unit must also have parent&!",
2747 Item
, Child_Parent
);
2751 or else Private_Present
(Item
)
2752 or else Nkind_In
(Lib_Unit
, N_Package_Body
, N_Subunit
)
2753 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
2754 and then not Acts_As_Spec
(Parent
(Lib_Unit
)))
2760 ("current unit must also be private descendant of&",
2761 Item
, Child_Parent
);
2769 end Check_Private_Child_Unit
;
2771 ----------------------
2772 -- Check_Stub_Level --
2773 ----------------------
2775 procedure Check_Stub_Level
(N
: Node_Id
) is
2776 Par
: constant Node_Id
:= Parent
(N
);
2777 Kind
: constant Node_Kind
:= Nkind
(Par
);
2780 if Nkind_In
(Kind
, N_Package_Body
,
2784 and then Nkind_In
(Parent
(Par
), N_Compilation_Unit
, N_Subunit
)
2788 -- In an instance, a missing stub appears at any level. A warning
2789 -- message will have been emitted already for the missing file.
2791 elsif not In_Instance
then
2792 Error_Msg_N
("stub cannot appear in an inner scope", N
);
2794 elsif Expander_Active
then
2795 Error_Msg_N
("missing proper body", N
);
2797 end Check_Stub_Level
;
2799 ------------------------
2800 -- Expand_With_Clause --
2801 ------------------------
2803 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
) is
2804 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
2805 Ent
: constant Entity_Id
:= Entity
(Nam
);
2809 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
;
2810 -- Build name to be used in implicit with_clause. In most cases this
2811 -- is the source name, but if renamings are present we must make the
2812 -- original unit visible, not the one it renames. The entity in the
2813 -- with clause is the renamed unit, but the identifier is the one from
2814 -- the source, which allows us to recover the unit renaming.
2816 ---------------------
2817 -- Build_Unit_Name --
2818 ---------------------
2820 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
is
2822 Renaming
: Entity_Id
;
2826 if Nkind
(Nam
) = N_Identifier
then
2828 -- If the parent unit P in the name of the with_clause for P.Q is
2829 -- a renaming of package R, then the entity of the parent is set
2830 -- to R, but the identifier retains Chars (P) to be consistent
2831 -- with the source (see details in lib-load). However the implicit
2832 -- with_clause for the parent must make the entity for P visible,
2833 -- because P.Q may be used as a prefix within the current unit.
2834 -- The entity for P is the current_entity with that name, because
2835 -- the package renaming declaration for it has just been analyzed.
2836 -- Note that this case can only happen if P.Q has already appeared
2837 -- in a previous with_clause in a related unit, such as the
2838 -- library body of the current unit.
2840 if Chars
(Nam
) /= Chars
(Entity
(Nam
)) then
2841 Renaming
:= Current_Entity
(Nam
);
2842 pragma Assert
(Renamed_Entity
(Renaming
) = Entity
(Nam
));
2843 return New_Occurrence_Of
(Renaming
, Loc
);
2846 return New_Occurrence_Of
(Entity
(Nam
), Loc
);
2850 Ent
:= Entity
(Nam
);
2852 if Present
(Entity
(Selector_Name
(Nam
)))
2853 and then Chars
(Entity
(Selector_Name
(Nam
))) /= Chars
(Ent
)
2855 Nkind
(Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
))))
2856 = N_Package_Renaming_Declaration
2858 -- The name in the with_clause is of the form A.B.C, and B is
2859 -- given by a renaming declaration. In that case we may not
2860 -- have analyzed the unit for B, but replaced it directly in
2861 -- lib-load with the unit it renames. We have to make A.B
2862 -- visible, so analyze the declaration for B now, in case it
2863 -- has not been done yet.
2865 Ent
:= Entity
(Selector_Name
(Nam
));
2868 (Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
)))));
2872 Make_Expanded_Name
(Loc
,
2873 Chars
=> Chars
(Entity
(Nam
)),
2874 Prefix
=> Build_Unit_Name
(Prefix
(Nam
)),
2875 Selector_Name
=> New_Occurrence_Of
(Ent
, Loc
));
2876 Set_Entity
(Result
, Ent
);
2879 end Build_Unit_Name
;
2881 -- Start of processing for Expand_With_Clause
2884 New_Nodes_OK
:= New_Nodes_OK
+ 1;
2886 Make_With_Clause
(Loc
,
2887 Name
=> Build_Unit_Name
(Nam
));
2889 P
:= Parent
(Unit_Declaration_Node
(Ent
));
2890 Set_Library_Unit
(Withn
, P
);
2891 Set_Corresponding_Spec
(Withn
, Ent
);
2892 Set_First_Name
(Withn
, True);
2893 Set_Implicit_With
(Withn
, True);
2895 -- If the unit is a package declaration, a private_with_clause on a
2896 -- child unit implies the implicit with on the parent is also private.
2898 if Nkind
(Unit
(N
)) = N_Package_Declaration
then
2899 Set_Private_Present
(Withn
, Private_Present
(Item
));
2902 Prepend
(Withn
, Context_Items
(N
));
2903 Mark_Rewrite_Insertion
(Withn
);
2904 Install_Withed_Unit
(Withn
);
2906 if Nkind
(Nam
) = N_Expanded_Name
then
2907 Expand_With_Clause
(Item
, Prefix
(Nam
), N
);
2910 New_Nodes_OK
:= New_Nodes_OK
- 1;
2911 end Expand_With_Clause
;
2913 -----------------------
2914 -- Get_Parent_Entity --
2915 -----------------------
2917 function Get_Parent_Entity
(Unit
: Node_Id
) return Entity_Id
is
2919 if Nkind
(Unit
) = N_Package_Body
2920 and then Nkind
(Original_Node
(Unit
)) = N_Package_Instantiation
2922 return Defining_Entity
2923 (Specification
(Instance_Spec
(Original_Node
(Unit
))));
2924 elsif Nkind
(Unit
) = N_Package_Instantiation
then
2925 return Defining_Entity
(Specification
(Instance_Spec
(Unit
)));
2927 return Defining_Entity
(Unit
);
2929 end Get_Parent_Entity
;
2931 ---------------------
2932 -- Has_With_Clause --
2933 ---------------------
2935 function Has_With_Clause
2938 Is_Limited
: Boolean := False) return Boolean
2942 function Named_Unit
(Clause
: Node_Id
) return Entity_Id
;
2943 -- Return the entity for the unit named in a [limited] with clause
2949 function Named_Unit
(Clause
: Node_Id
) return Entity_Id
is
2951 if Nkind
(Name
(Clause
)) = N_Selected_Component
then
2952 return Entity
(Selector_Name
(Name
(Clause
)));
2954 return Entity
(Name
(Clause
));
2958 -- Start of processing for Has_With_Clause
2961 if Present
(Context_Items
(C_Unit
)) then
2962 Item
:= First
(Context_Items
(C_Unit
));
2963 while Present
(Item
) loop
2964 if Nkind
(Item
) = N_With_Clause
2965 and then Limited_Present
(Item
) = Is_Limited
2966 and then Named_Unit
(Item
) = Pack
2976 end Has_With_Clause
;
2978 -----------------------------
2979 -- Implicit_With_On_Parent --
2980 -----------------------------
2982 procedure Implicit_With_On_Parent
2983 (Child_Unit
: Node_Id
;
2986 Loc
: constant Source_Ptr
:= Sloc
(N
);
2987 P
: constant Node_Id
:= Parent_Spec
(Child_Unit
);
2988 P_Unit
: Node_Id
:= Unit
(P
);
2989 P_Name
: constant Entity_Id
:= Get_Parent_Entity
(P_Unit
);
2992 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
;
2993 -- Build prefix of child unit name. Recurse if needed
2995 function Build_Unit_Name
return Node_Id
;
2996 -- If the unit is a child unit, build qualified name with all ancestors
2998 -------------------------
2999 -- Build_Ancestor_Name --
3000 -------------------------
3002 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
is
3003 P_Ref
: constant Node_Id
:=
3004 New_Reference_To
(Defining_Entity
(P
), Loc
);
3005 P_Spec
: Node_Id
:= P
;
3008 -- Ancestor may have been rewritten as a package body. Retrieve
3009 -- the original spec to trace earlier ancestors.
3011 if Nkind
(P
) = N_Package_Body
3012 and then Nkind
(Original_Node
(P
)) = N_Package_Instantiation
3014 P_Spec
:= Original_Node
(P
);
3017 if No
(Parent_Spec
(P_Spec
)) then
3021 Make_Selected_Component
(Loc
,
3022 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Spec
))),
3023 Selector_Name
=> P_Ref
);
3025 end Build_Ancestor_Name
;
3027 ---------------------
3028 -- Build_Unit_Name --
3029 ---------------------
3031 function Build_Unit_Name
return Node_Id
is
3035 if No
(Parent_Spec
(P_Unit
)) then
3036 return New_Reference_To
(P_Name
, Loc
);
3040 Make_Expanded_Name
(Loc
,
3041 Chars
=> Chars
(P_Name
),
3042 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Unit
))),
3043 Selector_Name
=> New_Reference_To
(P_Name
, Loc
));
3044 Set_Entity
(Result
, P_Name
);
3047 end Build_Unit_Name
;
3049 -- Start of processing for Implicit_With_On_Parent
3052 -- The unit of the current compilation may be a package body that
3053 -- replaces an instance node. In this case we need the original instance
3054 -- node to construct the proper parent name.
3056 if Nkind
(P_Unit
) = N_Package_Body
3057 and then Nkind
(Original_Node
(P_Unit
)) = N_Package_Instantiation
3059 P_Unit
:= Original_Node
(P_Unit
);
3062 -- We add the implicit with if the child unit is the current unit being
3063 -- compiled. If the current unit is a body, we do not want to add an
3064 -- implicit_with a second time to the corresponding spec.
3066 if Nkind
(Child_Unit
) = N_Package_Declaration
3067 and then Child_Unit
/= Unit
(Cunit
(Current_Sem_Unit
))
3072 New_Nodes_OK
:= New_Nodes_OK
+ 1;
3073 Withn
:= Make_With_Clause
(Loc
, Name
=> Build_Unit_Name
);
3075 Set_Library_Unit
(Withn
, P
);
3076 Set_Corresponding_Spec
(Withn
, P_Name
);
3077 Set_First_Name
(Withn
, True);
3078 Set_Implicit_With
(Withn
, True);
3080 -- Node is placed at the beginning of the context items, so that
3081 -- subsequent use clauses on the parent can be validated.
3083 Prepend
(Withn
, Context_Items
(N
));
3084 Mark_Rewrite_Insertion
(Withn
);
3085 Install_Withed_Unit
(Withn
);
3087 if Is_Child_Spec
(P_Unit
) then
3088 Implicit_With_On_Parent
(P_Unit
, N
);
3091 New_Nodes_OK
:= New_Nodes_OK
- 1;
3092 end Implicit_With_On_Parent
;
3098 function In_Chain
(E
: Entity_Id
) return Boolean is
3102 H
:= Current_Entity
(E
);
3103 while Present
(H
) loop
3114 ---------------------
3115 -- Install_Context --
3116 ---------------------
3118 procedure Install_Context
(N
: Node_Id
) is
3119 Lib_Unit
: constant Node_Id
:= Unit
(N
);
3122 Install_Context_Clauses
(N
);
3124 if Is_Child_Spec
(Lib_Unit
) then
3125 Install_Parents
(Lib_Unit
, Private_Present
(Parent
(Lib_Unit
)));
3128 Install_Limited_Context_Clauses
(N
);
3129 end Install_Context
;
3131 -----------------------------
3132 -- Install_Context_Clauses --
3133 -----------------------------
3135 procedure Install_Context_Clauses
(N
: Node_Id
) is
3136 Lib_Unit
: constant Node_Id
:= Unit
(N
);
3138 Uname_Node
: Entity_Id
;
3139 Check_Private
: Boolean := False;
3140 Decl_Node
: Node_Id
;
3141 Lib_Parent
: Entity_Id
;
3144 -- First skip configuration pragmas at the start of the context. They
3145 -- are not technically part of the context clause, but that's where the
3146 -- parser puts them. Note they were analyzed in Analyze_Context.
3148 Item
:= First
(Context_Items
(N
));
3149 while Present
(Item
)
3150 and then Nkind
(Item
) = N_Pragma
3151 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
3156 -- Loop through the actual context clause items. We process everything
3157 -- except Limited_With clauses in this routine. Limited_With clauses
3158 -- are separately installed (see Install_Limited_Context_Clauses).
3160 while Present
(Item
) loop
3162 -- Case of explicit WITH clause
3164 if Nkind
(Item
) = N_With_Clause
3165 and then not Implicit_With
(Item
)
3167 if Limited_Present
(Item
) then
3169 -- Limited withed units will be installed later
3173 -- If Name (Item) is not an entity name, something is wrong, and
3174 -- this will be detected in due course, for now ignore the item
3176 elsif not Is_Entity_Name
(Name
(Item
)) then
3179 elsif No
(Entity
(Name
(Item
))) then
3180 Set_Entity
(Name
(Item
), Any_Id
);
3184 Uname_Node
:= Entity
(Name
(Item
));
3186 if Is_Private_Descendant
(Uname_Node
) then
3187 Check_Private
:= True;
3190 Install_Withed_Unit
(Item
);
3192 Decl_Node
:= Unit_Declaration_Node
(Uname_Node
);
3194 -- If the unit is a subprogram instance, it appears nested within
3195 -- a package that carries the parent information.
3197 if Is_Generic_Instance
(Uname_Node
)
3198 and then Ekind
(Uname_Node
) /= E_Package
3200 Decl_Node
:= Parent
(Parent
(Decl_Node
));
3203 if Is_Child_Spec
(Decl_Node
) then
3204 if Nkind
(Name
(Item
)) = N_Expanded_Name
then
3205 Expand_With_Clause
(Item
, Prefix
(Name
(Item
)), N
);
3207 -- If not an expanded name, the child unit must be a
3208 -- renaming, nothing to do.
3213 elsif Nkind
(Decl_Node
) = N_Subprogram_Body
3214 and then not Acts_As_Spec
(Parent
(Decl_Node
))
3215 and then Is_Child_Spec
(Unit
(Library_Unit
(Parent
(Decl_Node
))))
3217 Implicit_With_On_Parent
3218 (Unit
(Library_Unit
(Parent
(Decl_Node
))), N
);
3221 -- Check license conditions unless this is a dummy unit
3223 if Sloc
(Library_Unit
(Item
)) /= No_Location
then
3224 License_Check
: declare
3225 Withu
: constant Unit_Number_Type
:=
3226 Get_Source_Unit
(Library_Unit
(Item
));
3227 Withl
: constant License_Type
:=
3228 License
(Source_Index
(Withu
));
3229 Unitl
: constant License_Type
:=
3230 License
(Source_Index
(Current_Sem_Unit
));
3232 procedure License_Error
;
3233 -- Signal error of bad license
3239 procedure License_Error
is
3242 ("?license of with'ed unit & may be inconsistent",
3246 -- Start of processing for License_Check
3249 -- Exclude license check if withed unit is an internal unit.
3250 -- This situation arises e.g. with the GPL version of GNAT.
3252 if Is_Internal_File_Name
(Unit_File_Name
(Withu
)) then
3255 -- Otherwise check various cases
3267 if Withl
= Restricted
then
3271 when Modified_GPL
=>
3272 if Withl
= Restricted
or else Withl
= GPL
then
3276 when Unrestricted
=>
3283 -- Case of USE PACKAGE clause
3285 elsif Nkind
(Item
) = N_Use_Package_Clause
then
3286 Analyze_Use_Package
(Item
);
3288 -- Case of USE TYPE clause
3290 elsif Nkind
(Item
) = N_Use_Type_Clause
then
3291 Analyze_Use_Type
(Item
);
3295 elsif Nkind
(Item
) = N_Pragma
then
3303 if Is_Child_Spec
(Lib_Unit
) then
3305 -- The unit also has implicit with_clauses on its own parents
3307 if No
(Context_Items
(N
)) then
3308 Set_Context_Items
(N
, New_List
);
3311 Implicit_With_On_Parent
(Lib_Unit
, N
);
3314 -- If the unit is a body, the context of the specification must also
3315 -- be installed. That includes private with_clauses in that context.
3317 if Nkind
(Lib_Unit
) = N_Package_Body
3318 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
3319 and then not Acts_As_Spec
(N
))
3321 Install_Context
(Library_Unit
(N
));
3323 -- Only install private with-clauses of a spec that comes from
3324 -- source, excluding specs created for a subprogram body that is
3327 if Comes_From_Source
(Library_Unit
(N
)) then
3328 Install_Private_With_Clauses
3329 (Defining_Entity
(Unit
(Library_Unit
(N
))));
3332 if Is_Child_Spec
(Unit
(Library_Unit
(N
))) then
3334 -- If the unit is the body of a public child unit, the private
3335 -- declarations of the parent must be made visible. If the child
3336 -- unit is private, the private declarations have been installed
3337 -- already in the call to Install_Parents for the spec. Installing
3338 -- private declarations must be done for all ancestors of public
3339 -- child units. In addition, sibling units mentioned in the
3340 -- context clause of the body are directly visible.
3348 Lib_Spec
:= Unit
(Library_Unit
(N
));
3349 while Is_Child_Spec
(Lib_Spec
) loop
3350 P
:= Unit
(Parent_Spec
(Lib_Spec
));
3351 P_Name
:= Defining_Entity
(P
);
3353 if not (Private_Present
(Parent
(Lib_Spec
)))
3354 and then not In_Private_Part
(P_Name
)
3356 Install_Private_Declarations
(P_Name
);
3357 Install_Private_With_Clauses
(P_Name
);
3358 Set_Use
(Private_Declarations
(Specification
(P
)));
3366 -- For a package body, children in context are immediately visible
3368 Install_Siblings
(Defining_Entity
(Unit
(Library_Unit
(N
))), N
);
3371 if Nkind_In
(Lib_Unit
, N_Generic_Package_Declaration
,
3372 N_Generic_Subprogram_Declaration
,
3373 N_Package_Declaration
,
3374 N_Subprogram_Declaration
)
3376 if Is_Child_Spec
(Lib_Unit
) then
3377 Lib_Parent
:= Defining_Entity
(Unit
(Parent_Spec
(Lib_Unit
)));
3378 Set_Is_Private_Descendant
3379 (Defining_Entity
(Lib_Unit
),
3380 Is_Private_Descendant
(Lib_Parent
)
3381 or else Private_Present
(Parent
(Lib_Unit
)));
3384 Set_Is_Private_Descendant
3385 (Defining_Entity
(Lib_Unit
),
3386 Private_Present
(Parent
(Lib_Unit
)));
3390 if Check_Private
then
3391 Check_Private_Child_Unit
(N
);
3393 end Install_Context_Clauses
;
3395 -------------------------------------
3396 -- Install_Limited_Context_Clauses --
3397 -------------------------------------
3399 procedure Install_Limited_Context_Clauses
(N
: Node_Id
) is
3402 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
);
3403 -- Check that the unlimited view of a given compilation_unit is not
3404 -- already visible through "use + renamings".
3406 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
);
3407 -- Check that if a limited_with clause of a given compilation_unit
3408 -- mentions a descendant of a private child of some library unit, then
3409 -- the given compilation_unit shall be the declaration of a private
3410 -- descendant of that library unit, or a public descendant of such. The
3411 -- code is analogous to that of Check_Private_Child_Unit but we cannot
3412 -- use entities on the limited with_clauses because their units have not
3413 -- been analyzed, so we have to climb the tree of ancestors looking for
3414 -- private keywords.
3416 procedure Expand_Limited_With_Clause
3417 (Comp_Unit
: Node_Id
;
3420 -- If a child unit appears in a limited_with clause, there are implicit
3421 -- limited_with clauses on all parents that are not already visible
3422 -- through a regular with clause. This procedure creates the implicit
3423 -- limited with_clauses for the parents and loads the corresponding
3424 -- units. The shadow entities are created when the inserted clause is
3425 -- analyzed. Implements Ada 2005 (AI-50217).
3427 function Is_Ancestor_Unit
(U1
: Node_Id
; U2
: Node_Id
) return Boolean;
3428 -- When compiling a unit Q descended from some parent unit P, a limited
3429 -- with_clause in the context of P that names some other ancestor of Q
3430 -- must not be installed because the ancestor is immediately visible.
3432 ---------------------
3433 -- Check_Renamings --
3434 ---------------------
3436 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
) is
3445 pragma Assert
(Nkind
(W
) = N_With_Clause
);
3447 -- Protect the frontend against previous critical errors
3449 case Nkind
(Unit
(Library_Unit
(W
))) is
3450 when N_Subprogram_Declaration |
3451 N_Package_Declaration |
3452 N_Generic_Subprogram_Declaration |
3453 N_Generic_Package_Declaration
=>
3460 -- Check "use + renamings"
3462 WEnt
:= Defining_Unit_Name
(Specification
(Unit
(Library_Unit
(W
))));
3463 Spec
:= Specification
(Unit
(P
));
3465 Item
:= First
(Visible_Declarations
(Spec
));
3466 while Present
(Item
) loop
3468 -- Look only at use package clauses
3470 if Nkind
(Item
) = N_Use_Package_Clause
then
3472 -- Traverse the list of packages
3474 Nam
:= First
(Names
(Item
));
3475 while Present
(Nam
) loop
3478 pragma Assert
(Present
(Parent
(E
)));
3480 if Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
3481 and then Renamed_Entity
(E
) = WEnt
3483 -- The unlimited view is visible through use clause and
3484 -- renamings. There is no need to generate the error
3485 -- message here because Is_Visible_Through_Renamings
3486 -- takes care of generating the precise error message.
3490 elsif Nkind
(Parent
(E
)) = N_Package_Specification
then
3492 -- The use clause may refer to a local package.
3493 -- Check all the enclosing scopes.
3496 while E2
/= Standard_Standard
3504 ("unlimited view visible through use clause ", W
);
3516 -- Recursive call to check all the ancestors
3518 if Is_Child_Spec
(Unit
(P
)) then
3519 Check_Renamings
(P
=> Parent_Spec
(Unit
(P
)), W
=> W
);
3521 end Check_Renamings
;
3523 ---------------------------------------
3524 -- Check_Private_Limited_Withed_Unit --
3525 ---------------------------------------
3527 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
) is
3528 Curr_Parent
: Node_Id
;
3529 Child_Parent
: Node_Id
;
3530 Curr_Private
: Boolean;
3533 -- Compilation unit of the parent of the withed library unit
3535 Child_Parent
:= Library_Unit
(Item
);
3537 -- If the child unit is a public child, then locate its nearest
3538 -- private ancestor, if any, then Child_Parent will then be set to
3539 -- the parent of that ancestor.
3541 if not Private_Present
(Library_Unit
(Item
)) then
3542 while Present
(Child_Parent
)
3543 and then not Private_Present
(Child_Parent
)
3545 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3548 if No
(Child_Parent
) then
3553 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3555 -- Traverse all the ancestors of the current compilation unit to
3556 -- check if it is a descendant of named library unit.
3558 Curr_Parent
:= Parent
(Item
);
3559 Curr_Private
:= Private_Present
(Curr_Parent
);
3561 while Present
(Parent_Spec
(Unit
(Curr_Parent
)))
3562 and then Curr_Parent
/= Child_Parent
3564 Curr_Parent
:= Parent_Spec
(Unit
(Curr_Parent
));
3565 Curr_Private
:= Curr_Private
or else Private_Present
(Curr_Parent
);
3568 if Curr_Parent
/= Child_Parent
then
3570 ("unit in with clause is private child unit!", Item
);
3572 ("\current unit must also have parent&!",
3573 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3575 elsif Private_Present
(Parent
(Item
))
3576 or else Curr_Private
3577 or else Private_Present
(Item
)
3578 or else Nkind_In
(Unit
(Parent
(Item
)), N_Package_Body
,
3582 -- Current unit is private, of descendant of a private unit
3588 ("current unit must also be private descendant of&",
3589 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3591 end Check_Private_Limited_Withed_Unit
;
3593 --------------------------------
3594 -- Expand_Limited_With_Clause --
3595 --------------------------------
3597 procedure Expand_Limited_With_Clause
3598 (Comp_Unit
: Node_Id
;
3602 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
3603 Unum
: Unit_Number_Type
;
3606 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean;
3607 -- Returns true if the context already includes a with_clause for
3608 -- this unit. If the with_clause is non-limited, the unit is fully
3609 -- visible and an implicit limited_with should not be created. If
3610 -- there is already a limited_with clause for W, a second one is
3611 -- simply redundant.
3613 --------------------------
3614 -- Previous_Withed_Unit --
3615 --------------------------
3617 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean is
3621 -- A limited with_clause cannot appear in the same context_clause
3622 -- as a nonlimited with_clause which mentions the same library.
3624 Item
:= First
(Context_Items
(Comp_Unit
));
3625 while Present
(Item
) loop
3626 if Nkind
(Item
) = N_With_Clause
3627 and then Library_Unit
(Item
) = Library_Unit
(W
)
3636 end Previous_Withed_Unit
;
3638 -- Start of processing for Expand_Limited_With_Clause
3641 New_Nodes_OK
:= New_Nodes_OK
+ 1;
3643 if Nkind
(Nam
) = N_Identifier
then
3645 -- Create node for name of withed unit
3648 Make_With_Clause
(Loc
,
3649 Name
=> New_Copy
(Nam
));
3651 else pragma Assert
(Nkind
(Nam
) = N_Selected_Component
);
3653 Make_With_Clause
(Loc
,
3654 Name
=> Make_Selected_Component
(Loc
,
3655 Prefix
=> New_Copy_Tree
(Prefix
(Nam
)),
3656 Selector_Name
=> New_Copy
(Selector_Name
(Nam
))));
3657 Set_Parent
(Withn
, Parent
(N
));
3660 Set_Limited_Present
(Withn
);
3661 Set_First_Name
(Withn
);
3662 Set_Implicit_With
(Withn
);
3666 (Load_Name
=> Get_Spec_Name
(Get_Unit_Name
(Nam
)),
3671 -- Do not generate a limited_with_clause on the current unit. This
3672 -- path is taken when a unit has a limited_with clause on one of its
3675 if Unum
= Current_Sem_Unit
then
3679 Set_Library_Unit
(Withn
, Cunit
(Unum
));
3680 Set_Corresponding_Spec
3681 (Withn
, Specification
(Unit
(Cunit
(Unum
))));
3683 if not Previous_Withed_Unit
(Withn
) then
3684 Prepend
(Withn
, Context_Items
(Parent
(N
)));
3685 Mark_Rewrite_Insertion
(Withn
);
3687 -- Add implicit limited_with_clauses for parents of child units
3688 -- mentioned in limited_with clauses.
3690 if Nkind
(Nam
) = N_Selected_Component
then
3691 Expand_Limited_With_Clause
(Comp_Unit
, Prefix
(Nam
), N
);
3696 if not Limited_View_Installed
(Withn
) then
3697 Install_Limited_Withed_Unit
(Withn
);
3701 New_Nodes_OK
:= New_Nodes_OK
- 1;
3702 end Expand_Limited_With_Clause
;
3704 ----------------------
3705 -- Is_Ancestor_Unit --
3706 ----------------------
3708 function Is_Ancestor_Unit
(U1
: Node_Id
; U2
: Node_Id
) return Boolean is
3709 E1
: constant Entity_Id
:= Defining_Entity
(Unit
(U1
));
3712 if Nkind_In
(Unit
(U2
), N_Package_Body
, N_Subprogram_Body
) then
3713 E2
:= Defining_Entity
(Unit
(Library_Unit
(U2
)));
3714 return Is_Ancestor_Package
(E1
, E2
);
3718 end Is_Ancestor_Unit
;
3720 -- Start of processing for Install_Limited_Context_Clauses
3723 Item
:= First
(Context_Items
(N
));
3724 while Present
(Item
) loop
3725 if Nkind
(Item
) = N_With_Clause
3726 and then Limited_Present
(Item
)
3727 and then not Error_Posted
(Item
)
3729 if Nkind
(Name
(Item
)) = N_Selected_Component
then
3730 Expand_Limited_With_Clause
3731 (Comp_Unit
=> N
, Nam
=> Prefix
(Name
(Item
)), N
=> Item
);
3734 Check_Private_Limited_Withed_Unit
(Item
);
3736 if not Implicit_With
(Item
)
3737 and then Is_Child_Spec
(Unit
(N
))
3739 Check_Renamings
(Parent_Spec
(Unit
(N
)), Item
);
3742 -- A unit may have a limited with on itself if it has a limited
3743 -- with_clause on one of its child units. In that case it is
3744 -- already being compiled and it makes no sense to install its
3747 -- If the item is a limited_private_with_clause, install it if the
3748 -- current unit is a body or if it is a private child. Otherwise
3749 -- the private clause is installed before analyzing the private
3750 -- part of the current unit.
3752 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
)
3753 and then not Limited_View_Installed
(Item
)
3755 not Is_Ancestor_Unit
3756 (Library_Unit
(Item
), Cunit
(Current_Sem_Unit
))
3758 if not Private_Present
(Item
)
3759 or else Private_Present
(N
)
3760 or else Nkind_In
(Unit
(N
), N_Package_Body
,
3764 Install_Limited_Withed_Unit
(Item
);
3772 -- Ada 2005 (AI-412): Examine visible declarations of a package spec,
3773 -- looking for incomplete subtype declarations of incomplete types
3774 -- visible through a limited with clause.
3776 if Ada_Version
>= Ada_2005
3777 and then Analyzed
(N
)
3778 and then Nkind
(Unit
(N
)) = N_Package_Declaration
3783 Non_Lim_View
: Entity_Id
;
3786 Decl
:= First
(Visible_Declarations
(Specification
(Unit
(N
))));
3787 while Present
(Decl
) loop
3788 if Nkind
(Decl
) = N_Subtype_Declaration
3790 Ekind
(Defining_Identifier
(Decl
)) = E_Incomplete_Subtype
3792 From_With_Type
(Defining_Identifier
(Decl
))
3794 Def_Id
:= Defining_Identifier
(Decl
);
3795 Non_Lim_View
:= Non_Limited_View
(Def_Id
);
3797 if not Is_Incomplete_Type
(Non_Lim_View
) then
3799 -- Convert an incomplete subtype declaration into a
3800 -- corresponding non-limited view subtype declaration.
3801 -- This is usually the case when analyzing a body that
3802 -- has regular with clauses, when the spec has limited
3805 -- If the non-limited view is still incomplete, it is
3806 -- the dummy entry already created, and the declaration
3807 -- cannot be reanalyzed. This is the case when installing
3808 -- a parent unit that has limited with-clauses.
3810 Set_Subtype_Indication
(Decl
,
3811 New_Reference_To
(Non_Lim_View
, Sloc
(Def_Id
)));
3812 Set_Etype
(Def_Id
, Non_Lim_View
);
3813 Set_Ekind
(Def_Id
, Subtype_Kind
(Ekind
(Non_Lim_View
)));
3814 Set_Analyzed
(Decl
, False);
3816 -- Reanalyze the declaration, suppressing the call to
3817 -- Enter_Name to avoid duplicate names.
3819 Analyze_Subtype_Declaration
3829 end Install_Limited_Context_Clauses
;
3831 ---------------------
3832 -- Install_Parents --
3833 ---------------------
3835 procedure Install_Parents
(Lib_Unit
: Node_Id
; Is_Private
: Boolean) is
3842 P
:= Unit
(Parent_Spec
(Lib_Unit
));
3843 P_Name
:= Get_Parent_Entity
(P
);
3845 if Etype
(P_Name
) = Any_Type
then
3849 if Ekind
(P_Name
) = E_Generic_Package
3850 and then not Nkind_In
(Lib_Unit
, N_Generic_Subprogram_Declaration
,
3851 N_Generic_Package_Declaration
)
3852 and then Nkind
(Lib_Unit
) not in N_Generic_Renaming_Declaration
3855 ("child of a generic package must be a generic unit", Lib_Unit
);
3857 elsif not Is_Package_Or_Generic_Package
(P_Name
) then
3859 ("parent unit must be package or generic package", Lib_Unit
);
3860 raise Unrecoverable_Error
;
3862 elsif Present
(Renamed_Object
(P_Name
)) then
3863 Error_Msg_N
("parent unit cannot be a renaming", Lib_Unit
);
3864 raise Unrecoverable_Error
;
3866 -- Verify that a child of an instance is itself an instance, or the
3867 -- renaming of one. Given that an instance that is a unit is replaced
3868 -- with a package declaration, check against the original node. The
3869 -- parent may be currently being instantiated, in which case it appears
3870 -- as a declaration, but the generic_parent is already established
3871 -- indicating that we deal with an instance.
3873 elsif Nkind
(Original_Node
(P
)) = N_Package_Instantiation
then
3874 if Nkind
(Lib_Unit
) in N_Renaming_Declaration
3875 or else Nkind
(Original_Node
(Lib_Unit
)) in N_Generic_Instantiation
3877 (Nkind
(Lib_Unit
) = N_Package_Declaration
3878 and then Present
(Generic_Parent
(Specification
(Lib_Unit
))))
3883 ("child of an instance must be an instance or renaming",
3888 -- This is the recursive call that ensures all parents are loaded
3890 if Is_Child_Spec
(P
) then
3892 Is_Private
or else Private_Present
(Parent
(Lib_Unit
)));
3895 -- Now we can install the context for this parent
3897 Install_Context_Clauses
(Parent_Spec
(Lib_Unit
));
3898 Install_Limited_Context_Clauses
(Parent_Spec
(Lib_Unit
));
3899 Install_Siblings
(P_Name
, Parent
(Lib_Unit
));
3901 -- The child unit is in the declarative region of the parent. The parent
3902 -- must therefore appear in the scope stack and be visible, as when
3903 -- compiling the corresponding body. If the child unit is private or it
3904 -- is a package body, private declarations must be accessible as well.
3905 -- Use declarations in the parent must also be installed. Finally, other
3906 -- child units of the same parent that are in the context are
3907 -- immediately visible.
3909 -- Find entity for compilation unit, and set its private descendant
3910 -- status as needed. Indicate that it is a compilation unit, which is
3911 -- redundant in general, but needed if this is a generated child spec
3912 -- for a child body without previous spec.
3914 E_Name
:= Defining_Entity
(Lib_Unit
);
3916 Set_Is_Child_Unit
(E_Name
);
3917 Set_Is_Compilation_Unit
(E_Name
);
3919 Set_Is_Private_Descendant
(E_Name
,
3920 Is_Private_Descendant
(P_Name
)
3921 or else Private_Present
(Parent
(Lib_Unit
)));
3923 P_Spec
:= Specification
(Unit_Declaration_Node
(P_Name
));
3924 Push_Scope
(P_Name
);
3926 -- Save current visibility of unit
3928 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
:=
3929 Is_Immediately_Visible
(P_Name
);
3930 Set_Is_Immediately_Visible
(P_Name
);
3931 Install_Visible_Declarations
(P_Name
);
3932 Set_Use
(Visible_Declarations
(P_Spec
));
3934 -- If the parent is a generic unit, its formal part may contain formal
3935 -- packages and use clauses for them.
3937 if Ekind
(P_Name
) = E_Generic_Package
then
3938 Set_Use
(Generic_Formal_Declarations
(Parent
(P_Spec
)));
3942 or else Private_Present
(Parent
(Lib_Unit
))
3944 Install_Private_Declarations
(P_Name
);
3945 Install_Private_With_Clauses
(P_Name
);
3946 Set_Use
(Private_Declarations
(P_Spec
));
3948 end Install_Parents
;
3950 ----------------------------------
3951 -- Install_Private_With_Clauses --
3952 ----------------------------------
3954 procedure Install_Private_With_Clauses
(P
: Entity_Id
) is
3955 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
3959 if Debug_Flag_I
then
3960 Write_Str
("install private with clauses of ");
3961 Write_Name
(Chars
(P
));
3965 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
3966 Item
:= First
(Context_Items
(Parent
(Decl
)));
3967 while Present
(Item
) loop
3968 if Nkind
(Item
) = N_With_Clause
3969 and then Private_Present
(Item
)
3971 if Limited_Present
(Item
) then
3972 if not Limited_View_Installed
(Item
) then
3973 Install_Limited_Withed_Unit
(Item
);
3976 Install_Withed_Unit
(Item
, Private_With_OK
=> True);
3983 end Install_Private_With_Clauses
;
3985 ----------------------
3986 -- Install_Siblings --
3987 ----------------------
3989 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
) is
3995 -- Iterate over explicit with clauses, and check whether the scope of
3996 -- each entity is an ancestor of the current unit, in which case it is
3997 -- immediately visible.
3999 Item
:= First
(Context_Items
(N
));
4000 while Present
(Item
) loop
4002 -- Do not install private_with_clauses declaration, unless unit
4003 -- is itself a private child unit, or is a body. Note that for a
4004 -- subprogram body the private_with_clause does not take effect until
4005 -- after the specification.
4007 if Nkind
(Item
) /= N_With_Clause
4008 or else Implicit_With
(Item
)
4009 or else Limited_Present
(Item
)
4013 elsif not Private_Present
(Item
)
4014 or else Private_Present
(N
)
4015 or else Nkind
(Unit
(N
)) = N_Package_Body
4017 Id
:= Entity
(Name
(Item
));
4019 if Is_Child_Unit
(Id
)
4020 and then Is_Ancestor_Package
(Scope
(Id
), U_Name
)
4022 Set_Is_Immediately_Visible
(Id
);
4024 -- Check for the presence of another unit in the context that
4025 -- may be inadvertently hidden by the child.
4027 Prev
:= Current_Entity
(Id
);
4030 and then Is_Immediately_Visible
(Prev
)
4031 and then not Is_Child_Unit
(Prev
)
4037 Clause
:= First
(Context_Items
(N
));
4038 while Present
(Clause
) loop
4039 if Nkind
(Clause
) = N_With_Clause
4040 and then Entity
(Name
(Clause
)) = Prev
4043 ("child unit& hides compilation unit " &
4044 "with the same name?",
4054 -- The With_Clause may be on a grand-child or one of its further
4055 -- descendants, which makes a child immediately visible. Examine
4056 -- ancestry to determine whether such a child exists. For example,
4057 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
4058 -- is immediately visible.
4060 elsif Is_Child_Unit
(Id
) then
4066 while Is_Child_Unit
(Par
) loop
4067 if Is_Ancestor_Package
(Scope
(Par
), U_Name
) then
4068 Set_Is_Immediately_Visible
(Par
);
4077 -- If the item is a private with-clause on a child unit, the parent
4078 -- may have been installed already, but the child unit must remain
4079 -- invisible until installed in a private part or body, unless there
4080 -- is already a regular with_clause for it in the current unit.
4082 elsif Private_Present
(Item
) then
4083 Id
:= Entity
(Name
(Item
));
4085 if Is_Child_Unit
(Id
) then
4089 function In_Context
return Boolean;
4090 -- Scan context of current unit, to check whether there is
4091 -- a with_clause on the same unit as a private with-clause
4092 -- on a parent, in which case child unit is visible. If the
4093 -- unit is a grand-child, the same applies to its parent.
4099 function In_Context
return Boolean is
4102 First
(Context_Items
(Cunit
(Current_Sem_Unit
)));
4103 while Present
(Clause
) loop
4104 if Nkind
(Clause
) = N_With_Clause
4105 and then Comes_From_Source
(Clause
)
4106 and then Is_Entity_Name
(Name
(Clause
))
4107 and then not Private_Present
(Clause
)
4109 if Entity
(Name
(Clause
)) = Id
4111 (Nkind
(Name
(Clause
)) = N_Expanded_Name
4112 and then Entity
(Prefix
(Name
(Clause
))) = Id
)
4125 Set_Is_Visible_Child_Unit
(Id
, In_Context
);
4132 end Install_Siblings
;
4134 ---------------------------------
4135 -- Install_Limited_Withed_Unit --
4136 ---------------------------------
4138 procedure Install_Limited_Withed_Unit
(N
: Node_Id
) is
4139 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
4142 Is_Child_Package
: Boolean := False;
4143 Lim_Header
: Entity_Id
;
4144 Lim_Typ
: Entity_Id
;
4146 procedure Check_Body_Required
;
4147 -- A unit mentioned in a limited with_clause may not be mentioned in
4148 -- a regular with_clause, but must still be included in the current
4149 -- partition. We need to determine whether the unit needs a body, so
4150 -- that the binder can determine the name of the file to be compiled.
4151 -- Checking whether a unit needs a body can be done without semantic
4152 -- analysis, by examining the nature of the declarations in the package.
4154 function Has_Limited_With_Clause
4155 (C_Unit
: Entity_Id
;
4156 Pack
: Entity_Id
) return Boolean;
4157 -- Determine whether any package in the ancestor chain starting with
4158 -- C_Unit has a limited with clause for package Pack.
4160 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean;
4161 -- Check if some package installed though normal with-clauses has a
4162 -- renaming declaration of package P. AARM 10.1.2(21/2).
4164 -------------------------
4165 -- Check_Body_Required --
4166 -------------------------
4168 procedure Check_Body_Required
is
4169 PA
: constant List_Id
:=
4170 Pragmas_After
(Aux_Decls_Node
(Parent
(P_Unit
)));
4172 procedure Check_Declarations
(Spec
: Node_Id
);
4173 -- Recursive procedure that does the work and checks nested packages
4175 ------------------------
4176 -- Check_Declarations --
4177 ------------------------
4179 procedure Check_Declarations
(Spec
: Node_Id
) is
4181 Incomplete_Decls
: constant Elist_Id
:= New_Elmt_List
;
4183 Subp_List
: constant Elist_Id
:= New_Elmt_List
;
4185 procedure Check_Pragma_Import
(P
: Node_Id
);
4186 -- If a pragma import applies to a previous subprogram, the
4187 -- enclosing unit may not need a body. The processing is syntactic
4188 -- and does not require a declaration to be analyzed. The code
4189 -- below also handles pragma Import when applied to a subprogram
4190 -- that renames another. In this case the pragma applies to the
4193 -- Chains of multiple renames are not handled by the code below.
4194 -- It is probably impossible to handle all cases without proper
4195 -- name resolution. In such cases the algorithm is conservative
4196 -- and will indicate that a body is needed???
4198 -------------------------
4199 -- Check_Pragma_Import --
4200 -------------------------
4202 procedure Check_Pragma_Import
(P
: Node_Id
) is
4208 procedure Remove_Homonyms
(E
: Node_Id
);
4209 -- Make one pass over list of subprograms. Called again if
4210 -- subprogram is a renaming. E is known to be an identifier.
4212 ---------------------
4213 -- Remove_Homonyms --
4214 ---------------------
4216 procedure Remove_Homonyms
(E
: Node_Id
) is
4217 R
: Entity_Id
:= Empty
;
4218 -- Name of renamed entity, if any
4221 Subp_Id
:= First_Elmt
(Subp_List
);
4222 while Present
(Subp_Id
) loop
4223 if Chars
(Node
(Subp_Id
)) = Chars
(E
) then
4224 if Nkind
(Parent
(Parent
(Node
(Subp_Id
))))
4225 /= N_Subprogram_Renaming_Declaration
4228 Next_Elmt
(Subp_Id
);
4229 Remove_Elmt
(Subp_List
, Prev_Id
);
4231 R
:= Name
(Parent
(Parent
(Node
(Subp_Id
))));
4235 Next_Elmt
(Subp_Id
);
4240 if Nkind
(R
) = N_Identifier
then
4241 Remove_Homonyms
(R
);
4243 elsif Nkind
(R
) = N_Selected_Component
then
4244 Remove_Homonyms
(Selector_Name
(R
));
4246 -- Renaming of attribute
4252 end Remove_Homonyms
;
4254 -- Start of processing for Check_Pragma_Import
4257 -- Find name of entity in Import pragma. We have not analyzed
4258 -- the construct, so we must guard against syntax errors.
4260 Arg
:= Next
(First
(Pragma_Argument_Associations
(P
)));
4263 or else Nkind
(Expression
(Arg
)) /= N_Identifier
4267 Imported
:= Expression
(Arg
);
4270 Remove_Homonyms
(Imported
);
4271 end Check_Pragma_Import
;
4273 -- Start of processing for Check_Declarations
4276 -- Search for Elaborate Body pragma
4278 Decl
:= First
(Visible_Declarations
(Spec
));
4279 while Present
(Decl
)
4280 and then Nkind
(Decl
) = N_Pragma
4282 if Get_Pragma_Id
(Decl
) = Pragma_Elaborate_Body
then
4283 Set_Body_Required
(Library_Unit
(N
));
4290 -- Look for declarations that require the presence of a body. We
4291 -- have already skipped pragmas at the start of the list.
4293 while Present
(Decl
) loop
4295 -- Subprogram that comes from source means body may be needed.
4296 -- Save for subsequent examination of import pragmas.
4298 if Comes_From_Source
(Decl
)
4299 and then (Nkind_In
(Decl
, N_Subprogram_Declaration
,
4300 N_Subprogram_Renaming_Declaration
,
4301 N_Generic_Subprogram_Declaration
))
4303 Append_Elmt
(Defining_Entity
(Decl
), Subp_List
);
4305 -- Package declaration of generic package declaration. We need
4306 -- to recursively examine nested declarations.
4308 elsif Nkind_In
(Decl
, N_Package_Declaration
,
4309 N_Generic_Package_Declaration
)
4311 Check_Declarations
(Specification
(Decl
));
4313 elsif Nkind
(Decl
) = N_Pragma
4314 and then Pragma_Name
(Decl
) = Name_Import
4316 Check_Pragma_Import
(Decl
);
4322 -- Same set of tests for private part. In addition to subprograms
4323 -- detect the presence of Taft Amendment types (incomplete types
4324 -- completed in the body).
4326 Decl
:= First
(Private_Declarations
(Spec
));
4327 while Present
(Decl
) loop
4328 if Comes_From_Source
(Decl
)
4329 and then (Nkind_In
(Decl
, N_Subprogram_Declaration
,
4330 N_Subprogram_Renaming_Declaration
,
4331 N_Generic_Subprogram_Declaration
))
4333 Append_Elmt
(Defining_Entity
(Decl
), Subp_List
);
4335 elsif Nkind_In
(Decl
, N_Package_Declaration
,
4336 N_Generic_Package_Declaration
)
4338 Check_Declarations
(Specification
(Decl
));
4340 -- Collect incomplete type declarations for separate pass
4342 elsif Nkind
(Decl
) = N_Incomplete_Type_Declaration
then
4343 Append_Elmt
(Decl
, Incomplete_Decls
);
4345 elsif Nkind
(Decl
) = N_Pragma
4346 and then Pragma_Name
(Decl
) = Name_Import
4348 Check_Pragma_Import
(Decl
);
4354 -- Now check incomplete declarations to locate Taft amendment
4355 -- types. This can be done by examining the defining identifiers
4356 -- of type declarations without real semantic analysis.
4362 Inc
:= First_Elmt
(Incomplete_Decls
);
4363 while Present
(Inc
) loop
4364 Decl
:= Next
(Node
(Inc
));
4365 while Present
(Decl
) loop
4366 if Nkind
(Decl
) = N_Full_Type_Declaration
4367 and then Chars
(Defining_Identifier
(Decl
)) =
4368 Chars
(Defining_Identifier
(Node
(Inc
)))
4376 -- If no completion, this is a TAT, and a body is needed
4379 Set_Body_Required
(Library_Unit
(N
));
4387 -- Finally, check whether there are subprograms that still require
4388 -- a body, i.e. are not renamings or null.
4390 if not Is_Empty_Elmt_List
(Subp_List
) then
4396 Subp_Id
:= First_Elmt
(Subp_List
);
4397 Spec
:= Parent
(Node
(Subp_Id
));
4399 while Present
(Subp_Id
) loop
4400 if Nkind
(Parent
(Spec
))
4401 = N_Subprogram_Renaming_Declaration
4405 elsif Nkind
(Spec
) = N_Procedure_Specification
4406 and then Null_Present
(Spec
)
4411 Set_Body_Required
(Library_Unit
(N
));
4415 Next_Elmt
(Subp_Id
);
4419 end Check_Declarations
;
4421 -- Start of processing for Check_Body_Required
4424 -- If this is an imported package (Java and CIL usage) no body is
4425 -- needed. Scan list of pragmas that may follow a compilation unit
4426 -- to look for a relevant pragma Import.
4428 if Present
(PA
) then
4434 while Present
(Prag
) loop
4435 if Nkind
(Prag
) = N_Pragma
4436 and then Get_Pragma_Id
(Prag
) = Pragma_Import
4446 Check_Declarations
(Specification
(P_Unit
));
4447 end Check_Body_Required
;
4449 -----------------------------
4450 -- Has_Limited_With_Clause --
4451 -----------------------------
4453 function Has_Limited_With_Clause
4454 (C_Unit
: Entity_Id
;
4455 Pack
: Entity_Id
) return Boolean
4462 while Present
(Par
) loop
4463 if Ekind
(Par
) /= E_Package
then
4467 -- Retrieve the Compilation_Unit node for Par and determine if
4468 -- its context clauses contain a limited with for Pack.
4470 Par_Unit
:= Parent
(Parent
(Parent
(Par
)));
4472 if Nkind
(Par_Unit
) = N_Package_Declaration
then
4473 Par_Unit
:= Parent
(Par_Unit
);
4476 if Has_With_Clause
(Par_Unit
, Pack
, True) then
4480 -- If there are more ancestors, climb up the tree, otherwise we
4483 if Is_Child_Unit
(Par
) then
4491 end Has_Limited_With_Clause
;
4493 ----------------------------------
4494 -- Is_Visible_Through_Renamings --
4495 ----------------------------------
4497 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean is
4498 Kind
: constant Node_Kind
:=
4499 Nkind
(Unit
(Cunit
(Current_Sem_Unit
)));
4505 -- Example of the error detected by this subprogram:
4513 -- package Ren_P renames P;
4519 -- limited with P; -- ERROR
4520 -- package R.C is ...
4522 Aux_Unit
:= Cunit
(Current_Sem_Unit
);
4525 Item
:= First
(Context_Items
(Aux_Unit
));
4526 while Present
(Item
) loop
4527 if Nkind
(Item
) = N_With_Clause
4528 and then not Limited_Present
(Item
)
4529 and then Nkind
(Unit
(Library_Unit
(Item
))) =
4530 N_Package_Declaration
4533 First
(Visible_Declarations
4534 (Specification
(Unit
(Library_Unit
(Item
)))));
4535 while Present
(Decl
) loop
4536 if Nkind
(Decl
) = N_Package_Renaming_Declaration
4537 and then Entity
(Name
(Decl
)) = P
4539 -- Generate the error message only if the current unit
4540 -- is a package declaration; in case of subprogram
4541 -- bodies and package bodies we just return True to
4542 -- indicate that the limited view must not be
4545 if Kind
= N_Package_Declaration
then
4547 ("simultaneous visibility of the limited and " &
4548 "unlimited views not allowed", N
);
4549 Error_Msg_Sloc
:= Sloc
(Item
);
4551 ("\\ unlimited view of & visible through the " &
4552 "context clause #", N
, P
);
4553 Error_Msg_Sloc
:= Sloc
(Decl
);
4554 Error_Msg_NE
("\\ and the renaming #", N
, P
);
4567 -- If it is a body not acting as spec, follow pointer to the
4568 -- corresponding spec, otherwise follow pointer to parent spec.
4570 if Present
(Library_Unit
(Aux_Unit
))
4571 and then Nkind_In
(Unit
(Aux_Unit
),
4572 N_Package_Body
, N_Subprogram_Body
)
4574 if Aux_Unit
= Library_Unit
(Aux_Unit
) then
4576 -- Aux_Unit is a body that acts as a spec. Clause has
4577 -- already been flagged as illegal.
4582 Aux_Unit
:= Library_Unit
(Aux_Unit
);
4586 Aux_Unit
:= Parent_Spec
(Unit
(Aux_Unit
));
4589 exit when No
(Aux_Unit
);
4593 end Is_Visible_Through_Renamings
;
4595 -- Start of processing for Install_Limited_Withed_Unit
4598 pragma Assert
(not Limited_View_Installed
(N
));
4600 -- In case of limited with_clause on subprograms, generics, instances,
4601 -- or renamings, the corresponding error was previously posted and we
4602 -- have nothing to do here. If the file is missing altogether, it has
4603 -- no source location.
4605 if Nkind
(P_Unit
) /= N_Package_Declaration
4606 or else Sloc
(P_Unit
) = No_Location
4611 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
4613 -- Handle child packages
4615 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
4616 Is_Child_Package
:= True;
4617 P
:= Defining_Identifier
(P
);
4620 -- Do not install the limited-view if the context of the unit is already
4621 -- available through a regular with clause.
4623 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4624 and then Has_With_Clause
(Cunit
(Current_Sem_Unit
), P
)
4629 -- Do not install the limited-view if the full-view is already visible
4630 -- through renaming declarations.
4632 if Is_Visible_Through_Renamings
(P
) then
4636 -- Do not install the limited view if this is the unit being analyzed.
4637 -- This unusual case will happen when a unit has a limited_with clause
4638 -- on one of its children. The compilation of the child forces the load
4639 -- of the parent which tries to install the limited view of the child
4640 -- again. Installing the limited view must also be disabled when
4641 -- compiling the body of the child unit.
4643 if P
= Cunit_Entity
(Current_Sem_Unit
)
4645 (Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4646 and then P
= Main_Unit_Entity
)
4651 -- This scenario is similar to the one above, the difference is that the
4652 -- compilation of sibling Par.Sib forces the load of parent Par which
4653 -- tries to install the limited view of Lim_Pack [1]. However Par.Sib
4654 -- has a with clause for Lim_Pack [2] in its body, and thus needs the
4655 -- non-limited views of all entities from Lim_Pack.
4657 -- limited with Lim_Pack; -- [1]
4658 -- package Par is ... package Lim_Pack is ...
4660 -- with Lim_Pack; -- [2]
4661 -- package Par.Sib is ... package body Par.Sib is ...
4663 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4664 -- Sem_Unit is the body of Par.Sib.
4666 if Ekind
(P
) = E_Package
4667 and then Ekind
(Main_Unit_Entity
) = E_Package
4668 and then Is_Child_Unit
(Main_Unit_Entity
)
4670 -- The body has a regular with clause
4672 and then Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4673 and then Has_With_Clause
(Cunit
(Current_Sem_Unit
), P
)
4675 -- One of the ancestors has a limited with clause
4677 and then Nkind
(Parent
(Parent
(Main_Unit_Entity
))) =
4678 N_Package_Specification
4679 and then Has_Limited_With_Clause
(Scope
(Main_Unit_Entity
), P
)
4684 -- A common use of the limited-with is to have a limited-with in the
4685 -- package spec, and a normal with in its package body. For example:
4687 -- limited with X; -- [1]
4691 -- package body A is ...
4693 -- The compilation of A's body installs the context clauses found at [2]
4694 -- and then the context clauses of its specification (found at [1]). As
4695 -- a consequence, at [1] the specification of X has been analyzed and it
4696 -- is immediately visible. According to the semantics of limited-with
4697 -- context clauses we don't install the limited view because the full
4698 -- view of X supersedes its limited view.
4700 if Analyzed
(P_Unit
)
4702 (Is_Immediately_Visible
(P
)
4703 or else (Is_Child_Package
and then Is_Visible_Child_Unit
(P
)))
4706 -- The presence of both the limited and the analyzed nonlimited view
4707 -- may also be an error, such as an illegal context for a limited
4708 -- with_clause. In that case, do not process the context item at all.
4710 if Error_Posted
(N
) then
4714 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
then
4718 Item
:= First
(Context_Items
(Cunit
(Current_Sem_Unit
)));
4719 while Present
(Item
) loop
4720 if Nkind
(Item
) = N_With_Clause
4721 and then Comes_From_Source
(Item
)
4722 and then Entity
(Name
(Item
)) = P
4731 -- If this is a child body, assume that the nonlimited with_clause
4732 -- appears in an ancestor. Could be refined ???
4736 (Unit
(Library_Unit
(Cunit
(Current_Sem_Unit
)))))
4743 -- If in package declaration, nonlimited view brought in from
4744 -- parent unit or some error condition.
4750 if Debug_Flag_I
then
4751 Write_Str
("install limited view of ");
4752 Write_Name
(Chars
(P
));
4756 -- If the unit has not been analyzed and the limited view has not been
4757 -- already installed then we install it.
4759 if not Analyzed
(P_Unit
) then
4760 if not In_Chain
(P
) then
4762 -- Minimum decoration
4764 Set_Ekind
(P
, E_Package
);
4765 Set_Etype
(P
, Standard_Void_Type
);
4766 Set_Scope
(P
, Standard_Standard
);
4768 if Is_Child_Package
then
4769 Set_Is_Child_Unit
(P
);
4770 Set_Is_Visible_Child_Unit
(P
);
4771 Set_Scope
(P
, Defining_Entity
(Unit
(Parent_Spec
(P_Unit
))));
4774 -- Place entity on visibility structure
4776 Set_Homonym
(P
, Current_Entity
(P
));
4777 Set_Current_Entity
(P
);
4779 if Debug_Flag_I
then
4780 Write_Str
(" (homonym) chain ");
4781 Write_Name
(Chars
(P
));
4785 -- Install the incomplete view. The first element of the limited
4786 -- view is a header (an E_Package entity) used to reference the
4787 -- first shadow entity in the private part of the package.
4789 Lim_Header
:= Limited_View
(P
);
4790 Lim_Typ
:= First_Entity
(Lim_Header
);
4792 while Present
(Lim_Typ
)
4793 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
4795 Set_Homonym
(Lim_Typ
, Current_Entity
(Lim_Typ
));
4796 Set_Current_Entity
(Lim_Typ
);
4798 if Debug_Flag_I
then
4799 Write_Str
(" (homonym) chain ");
4800 Write_Name
(Chars
(Lim_Typ
));
4804 Next_Entity
(Lim_Typ
);
4808 -- If the unit appears in a previous regular with_clause, the regular
4809 -- entities of the public part of the withed package must be replaced
4810 -- by the shadow ones.
4812 -- This code must be kept synchronized with the code that replaces the
4813 -- shadow entities by the real entities (see body of Remove_Limited
4814 -- With_Clause); otherwise the contents of the homonym chains are not
4818 -- Hide all the type entities of the public part of the package to
4819 -- avoid its usage. This is needed to cover all the subtype decla-
4820 -- rations because we do not remove them from the homonym chain.
4822 E
:= First_Entity
(P
);
4823 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
4825 Set_Was_Hidden
(E
, Is_Hidden
(E
));
4832 -- Replace the real entities by the shadow entities of the limited
4833 -- view. The first element of the limited view is a header that is
4834 -- used to reference the first shadow entity in the private part
4835 -- of the package. Successive elements are the limited views of the
4836 -- type (including regular incomplete types) declared in the package.
4838 Lim_Header
:= Limited_View
(P
);
4840 Lim_Typ
:= First_Entity
(Lim_Header
);
4841 while Present
(Lim_Typ
)
4842 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
4844 pragma Assert
(not In_Chain
(Lim_Typ
));
4846 -- Do not unchain nested packages and child units
4848 if Ekind
(Lim_Typ
) /= E_Package
4849 and then not Is_Child_Unit
(Lim_Typ
)
4855 Prev
:= Current_Entity
(Lim_Typ
);
4858 -- Replace E in the homonyms list, so that the limited view
4859 -- becomes available.
4861 if E
= Non_Limited_View
(Lim_Typ
) then
4862 Set_Homonym
(Lim_Typ
, Homonym
(Prev
));
4863 Set_Current_Entity
(Lim_Typ
);
4867 E
:= Homonym
(Prev
);
4869 -- E may have been removed when installing a previous
4870 -- limited_with_clause.
4874 exit when E
= Non_Limited_View
(Lim_Typ
);
4876 Prev
:= Homonym
(Prev
);
4880 Set_Homonym
(Lim_Typ
, Homonym
(Homonym
(Prev
)));
4881 Set_Homonym
(Prev
, Lim_Typ
);
4886 if Debug_Flag_I
then
4887 Write_Str
(" (homonym) chain ");
4888 Write_Name
(Chars
(Lim_Typ
));
4893 Next_Entity
(Lim_Typ
);
4897 -- The package must be visible while the limited-with clause is active
4898 -- because references to the type P.T must resolve in the usual way.
4899 -- In addition, we remember that the limited-view has been installed to
4900 -- uninstall it at the point of context removal.
4902 Set_Is_Immediately_Visible
(P
);
4903 Set_Limited_View_Installed
(N
);
4905 -- If unit has not been analyzed in some previous context, check
4906 -- (imperfectly ???) whether it might need a body.
4908 if not Analyzed
(P_Unit
) then
4909 Check_Body_Required
;
4912 -- If the package in the limited_with clause is a child unit, the clause
4913 -- is unanalyzed and appears as a selected component. Recast it as an
4914 -- expanded name so that the entity can be properly set. Use entity of
4915 -- parent, if available, for higher ancestors in the name.
4917 if Nkind
(Name
(N
)) = N_Selected_Component
then
4925 while Nkind
(Nam
) = N_Selected_Component
4926 and then Present
(Ent
)
4928 Change_Selected_Component_To_Expanded_Name
(Nam
);
4930 -- Set entity of parent identifiers if the unit is a child
4931 -- unit. This ensures that the tree is properly formed from
4932 -- semantic point of view (e.g. for ASIS queries).
4934 Set_Entity
(Nam
, Ent
);
4936 Nam
:= Prefix
(Nam
);
4939 -- Set entity of last ancestor
4941 if Nkind
(Nam
) = N_Identifier
then
4942 Set_Entity
(Nam
, Ent
);
4948 Set_Entity
(Name
(N
), P
);
4949 Set_From_With_Type
(P
);
4950 end Install_Limited_Withed_Unit
;
4952 -------------------------
4953 -- Install_Withed_Unit --
4954 -------------------------
4956 procedure Install_Withed_Unit
4957 (With_Clause
: Node_Id
;
4958 Private_With_OK
: Boolean := False)
4960 Uname
: constant Entity_Id
:= Entity
(Name
(With_Clause
));
4961 P
: constant Entity_Id
:= Scope
(Uname
);
4964 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
4965 -- compiling a package declaration and the Private_With_OK flag was not
4966 -- set by the caller. These declarations will be installed later (before
4967 -- analyzing the private part of the package).
4969 if Private_Present
(With_Clause
)
4970 and then Nkind
(Unit
(Parent
(With_Clause
))) = N_Package_Declaration
4971 and then not (Private_With_OK
)
4976 if Debug_Flag_I
then
4977 if Private_Present
(With_Clause
) then
4978 Write_Str
("install private withed unit ");
4980 Write_Str
("install withed unit ");
4983 Write_Name
(Chars
(Uname
));
4987 -- We do not apply the restrictions to an internal unit unless we are
4988 -- compiling the internal unit as a main unit. This check is also
4989 -- skipped for dummy units (for missing packages).
4991 if Sloc
(Uname
) /= No_Location
4992 and then (not Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
))
4993 or else Current_Sem_Unit
= Main_Unit
)
4995 Check_Restricted_Unit
4996 (Unit_Name
(Get_Source_Unit
(Uname
)), With_Clause
);
4999 if P
/= Standard_Standard
then
5001 -- If the unit is not analyzed after analysis of the with clause and
5002 -- it is an instantiation then it awaits a body and is the main unit.
5003 -- Its appearance in the context of some other unit indicates a
5004 -- circular dependency (DEC suite perversity).
5006 if not Analyzed
(Uname
)
5007 and then Nkind
(Parent
(Uname
)) = N_Package_Instantiation
5010 ("instantiation depends on itself", Name
(With_Clause
));
5012 elsif not Is_Visible_Child_Unit
(Uname
) then
5013 Set_Is_Visible_Child_Unit
(Uname
);
5015 -- If the child unit appears in the context of its parent, it is
5016 -- immediately visible.
5018 if In_Open_Scopes
(Scope
(Uname
)) then
5019 Set_Is_Immediately_Visible
(Uname
);
5022 if Is_Generic_Instance
(Uname
)
5023 and then Ekind
(Uname
) in Subprogram_Kind
5025 -- Set flag as well on the visible entity that denotes the
5026 -- instance, which renames the current one.
5028 Set_Is_Visible_Child_Unit
5030 (Defining_Entity
(Unit
(Library_Unit
(With_Clause
)))));
5033 -- The parent unit may have been installed already, and may have
5034 -- appeared in a use clause.
5036 if In_Use
(Scope
(Uname
)) then
5037 Set_Is_Potentially_Use_Visible
(Uname
);
5040 Set_Context_Installed
(With_Clause
);
5043 elsif not Is_Immediately_Visible
(Uname
) then
5044 if not Private_Present
(With_Clause
)
5045 or else Private_With_OK
5047 Set_Is_Immediately_Visible
(Uname
);
5050 Set_Context_Installed
(With_Clause
);
5053 -- A with-clause overrides a with-type clause: there are no restric-
5054 -- tions on the use of package entities.
5056 if Ekind
(Uname
) = E_Package
then
5057 Set_From_With_Type
(Uname
, False);
5060 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
5061 -- unit if there is a visible homograph for it declared in the same
5062 -- declarative region. This pathological case can only arise when an
5063 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
5064 -- G1 has a generic child also named G2, and the context includes with_
5065 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
5066 -- of I1.G2 visible as well. If the child unit is named Standard, do
5067 -- not apply the check to the Standard package itself.
5069 if Is_Child_Unit
(Uname
)
5070 and then Is_Visible_Child_Unit
(Uname
)
5071 and then Ada_Version
>= Ada_2005
5074 Decl1
: constant Node_Id
:= Unit_Declaration_Node
(P
);
5080 U2
:= Homonym
(Uname
);
5082 and then U2
/= Standard_Standard
5085 Decl2
:= Unit_Declaration_Node
(P2
);
5087 if Is_Child_Unit
(U2
)
5088 and then Is_Visible_Child_Unit
(U2
)
5090 if Is_Generic_Instance
(P
)
5091 and then Nkind
(Decl1
) = N_Package_Declaration
5092 and then Generic_Parent
(Specification
(Decl1
)) = P2
5094 Error_Msg_N
("illegal with_clause", With_Clause
);
5096 ("\child unit has visible homograph" &
5097 " (RM 8.3(26), 10.1.1(19))",
5101 elsif Is_Generic_Instance
(P2
)
5102 and then Nkind
(Decl2
) = N_Package_Declaration
5103 and then Generic_Parent
(Specification
(Decl2
)) = P
5105 -- With_clause for child unit of instance appears before
5106 -- in the context. We want to place the error message on
5107 -- it, not on the generic child unit itself.
5110 Prev_Clause
: Node_Id
;
5113 Prev_Clause
:= First
(List_Containing
(With_Clause
));
5114 while Entity
(Name
(Prev_Clause
)) /= U2
loop
5118 pragma Assert
(Present
(Prev_Clause
));
5119 Error_Msg_N
("illegal with_clause", Prev_Clause
);
5121 ("\child unit has visible homograph" &
5122 " (RM 8.3(26), 10.1.1(19))",
5133 end Install_Withed_Unit
;
5139 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean is
5140 K
: constant Node_Kind
:= Nkind
(Lib_Unit
);
5143 return (K
in N_Generic_Declaration
or else
5144 K
in N_Generic_Instantiation
or else
5145 K
in N_Generic_Renaming_Declaration
or else
5146 K
= N_Package_Declaration
or else
5147 K
= N_Package_Renaming_Declaration
or else
5148 K
= N_Subprogram_Declaration
or else
5149 K
= N_Subprogram_Renaming_Declaration
)
5150 and then Present
(Parent_Spec
(Lib_Unit
));
5153 ------------------------------------
5154 -- Is_Legal_Shadow_Entity_In_Body --
5155 ------------------------------------
5157 function Is_Legal_Shadow_Entity_In_Body
(T
: Entity_Id
) return Boolean is
5158 C_Unit
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
5160 return Nkind
(Unit
(C_Unit
)) = N_Package_Body
5163 (C_Unit
, Cunit_Entity
(Get_Source_Unit
(Non_Limited_View
(T
))));
5164 end Is_Legal_Shadow_Entity_In_Body
;
5166 -----------------------
5167 -- Load_Needed_Body --
5168 -----------------------
5170 -- N is a generic unit named in a with clause, or else it is a unit that
5171 -- contains a generic unit or an inlined function. In order to perform an
5172 -- instantiation, the body of the unit must be present. If the unit itself
5173 -- is generic, we assume that an instantiation follows, and load & analyze
5174 -- the body unconditionally. This forces analysis of the spec as well.
5176 -- If the unit is not generic, but contains a generic unit, it is loaded on
5177 -- demand, at the point of instantiation (see ch12).
5179 procedure Load_Needed_Body
5182 Do_Analyze
: Boolean := True)
5184 Body_Name
: Unit_Name_Type
;
5185 Unum
: Unit_Number_Type
;
5187 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
5188 -- The loading and analysis is done with style checks off
5191 if not GNAT_Mode
then
5192 Style_Check
:= False;
5195 Body_Name
:= Get_Body_Name
(Get_Unit_Name
(Unit
(N
)));
5198 (Load_Name
=> Body_Name
,
5204 if Unum
= No_Unit
then
5208 Compiler_State
:= Analyzing
; -- reset after load
5210 if not Fatal_Error
(Unum
) or else Try_Semantics
then
5211 if Debug_Flag_L
then
5212 Write_Str
("*** Loaded generic body");
5217 Semantics
(Cunit
(Unum
));
5224 Style_Check
:= Save_Style_Check
;
5225 end Load_Needed_Body
;
5227 -------------------------
5228 -- Build_Limited_Views --
5229 -------------------------
5231 procedure Build_Limited_Views
(N
: Node_Id
) is
5232 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Library_Unit
(N
));
5233 P
: constant Entity_Id
:= Cunit_Entity
(Unum
);
5235 Spec
: Node_Id
; -- To denote a package specification
5236 Lim_Typ
: Entity_Id
; -- To denote shadow entities
5237 Comp_Typ
: Entity_Id
; -- To denote real entities
5239 Lim_Header
: Entity_Id
; -- Package entity
5240 Last_Lim_E
: Entity_Id
:= Empty
; -- Last limited entity built
5241 Last_Pub_Lim_E
: Entity_Id
; -- To set the first private entity
5243 procedure Decorate_Incomplete_Type
(E
: Entity_Id
; Scop
: Entity_Id
);
5244 -- Add attributes of an incomplete type to a shadow entity. The same
5245 -- attributes are placed on the real entity, so that gigi receives
5246 -- a consistent view.
5248 procedure Decorate_Package_Specification
(P
: Entity_Id
);
5249 -- Add attributes of a package entity to the entity in a package
5252 procedure Decorate_Tagged_Type
5256 -- Set basic attributes of tagged type T, including its class_wide type.
5257 -- The parameters Loc, Scope are used to decorate the class_wide type.
5259 procedure Build_Chain
(Scope
: Entity_Id
; First_Decl
: Node_Id
);
5260 -- Construct list of shadow entities and attach it to entity of
5261 -- package that is mentioned in a limited_with clause.
5263 function New_Internal_Shadow_Entity
5264 (Kind
: Entity_Kind
;
5265 Sloc_Value
: Source_Ptr
;
5266 Id_Char
: Character) return Entity_Id
;
5267 -- Build a new internal entity and append it to the list of shadow
5268 -- entities available through the limited-header
5274 procedure Build_Chain
(Scope
: Entity_Id
; First_Decl
: Node_Id
) is
5275 Analyzed_Unit
: constant Boolean := Analyzed
(Cunit
(Unum
));
5276 Is_Tagged
: Boolean;
5281 while Present
(Decl
) loop
5283 -- For each library_package_declaration in the environment, there
5284 -- is an implicit declaration of a *limited view* of that library
5285 -- package. The limited view of a package contains:
5287 -- * For each nested package_declaration, a declaration of the
5288 -- limited view of that package, with the same defining-
5289 -- program-unit name.
5291 -- * For each type_declaration in the visible part, an incomplete
5292 -- type-declaration with the same defining_identifier, whose
5293 -- completion is the type_declaration. If the type_declaration
5294 -- is tagged, then the incomplete_type_declaration is tagged
5297 -- The partial view is tagged if the declaration has the
5298 -- explicit keyword, or else if it is a type extension, both
5299 -- of which can be ascertained syntactically.
5301 if Nkind
(Decl
) = N_Full_Type_Declaration
then
5303 (Nkind
(Type_Definition
(Decl
)) = N_Record_Definition
5304 and then Tagged_Present
(Type_Definition
(Decl
)))
5306 (Nkind
(Type_Definition
(Decl
)) = N_Derived_Type_Definition
5309 (Record_Extension_Part
(Type_Definition
(Decl
))));
5311 Comp_Typ
:= Defining_Identifier
(Decl
);
5313 if not Analyzed_Unit
then
5315 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5317 Decorate_Incomplete_Type
(Comp_Typ
, Scope
);
5321 -- Create shadow entity for type
5324 New_Internal_Shadow_Entity
5325 (Kind
=> Ekind
(Comp_Typ
),
5326 Sloc_Value
=> Sloc
(Comp_Typ
),
5329 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5330 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5331 Set_From_With_Type
(Lim_Typ
);
5334 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5336 Decorate_Incomplete_Type
(Lim_Typ
, Scope
);
5339 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5341 elsif Nkind_In
(Decl
, N_Private_Type_Declaration
,
5342 N_Incomplete_Type_Declaration
,
5343 N_Task_Type_Declaration
,
5344 N_Protected_Type_Declaration
)
5346 Comp_Typ
:= Defining_Identifier
(Decl
);
5349 Nkind_In
(Decl
, N_Private_Type_Declaration
,
5350 N_Incomplete_Type_Declaration
)
5351 and then Tagged_Present
(Decl
);
5353 if not Analyzed_Unit
then
5355 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5357 Decorate_Incomplete_Type
(Comp_Typ
, Scope
);
5362 New_Internal_Shadow_Entity
5363 (Kind
=> Ekind
(Comp_Typ
),
5364 Sloc_Value
=> Sloc
(Comp_Typ
),
5367 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5368 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5369 Set_From_With_Type
(Lim_Typ
);
5372 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5374 Decorate_Incomplete_Type
(Lim_Typ
, Scope
);
5377 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5379 elsif Nkind
(Decl
) = N_Private_Extension_Declaration
then
5380 Comp_Typ
:= Defining_Identifier
(Decl
);
5382 if not Analyzed_Unit
then
5383 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
5386 -- Create shadow entity for type
5389 New_Internal_Shadow_Entity
5390 (Kind
=> Ekind
(Comp_Typ
),
5391 Sloc_Value
=> Sloc
(Comp_Typ
),
5394 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5395 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5396 Set_From_With_Type
(Lim_Typ
);
5398 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
5399 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
5401 elsif Nkind
(Decl
) = N_Package_Declaration
then
5406 Spec
: constant Node_Id
:= Specification
(Decl
);
5409 Comp_Typ
:= Defining_Unit_Name
(Spec
);
5411 if not Analyzed
(Cunit
(Unum
)) then
5412 Decorate_Package_Specification
(Comp_Typ
);
5413 Set_Scope
(Comp_Typ
, Scope
);
5417 New_Internal_Shadow_Entity
5418 (Kind
=> Ekind
(Comp_Typ
),
5419 Sloc_Value
=> Sloc
(Comp_Typ
),
5422 Decorate_Package_Specification
(Lim_Typ
);
5423 Set_Scope
(Lim_Typ
, Scope
);
5425 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
5426 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
5427 Set_From_With_Type
(Lim_Typ
);
5429 -- Note: The non_limited_view attribute is not used
5430 -- for local packages.
5434 First_Decl
=> First
(Visible_Declarations
(Spec
)));
5442 ------------------------------
5443 -- Decorate_Incomplete_Type --
5444 ------------------------------
5446 procedure Decorate_Incomplete_Type
(E
: Entity_Id
; Scop
: Entity_Id
) is
5448 Set_Ekind
(E
, E_Incomplete_Type
);
5449 Set_Scope
(E
, Scop
);
5451 Set_Is_First_Subtype
(E
, True);
5452 Set_Stored_Constraint
(E
, No_Elist
);
5453 Set_Full_View
(E
, Empty
);
5454 Init_Size_Align
(E
);
5455 end Decorate_Incomplete_Type
;
5457 --------------------------
5458 -- Decorate_Tagged_Type --
5459 --------------------------
5461 procedure Decorate_Tagged_Type
5469 Decorate_Incomplete_Type
(T
, Scop
);
5470 Set_Is_Tagged_Type
(T
);
5472 -- Build corresponding class_wide type, if not previously done
5474 -- Note: The class-wide entity is shared by the limited-view
5475 -- and the full-view.
5477 if No
(Class_Wide_Type
(T
)) then
5478 CW
:= Make_Temporary
(Loc
, 'S');
5480 -- Set parent to be the same as the parent of the tagged type.
5481 -- We need a parent field set, and it is supposed to point to
5482 -- the declaration of the type. The tagged type declaration
5483 -- essentially declares two separate types, the tagged type
5484 -- itself and the corresponding class-wide type, so it is
5485 -- reasonable for the parent fields to point to the declaration
5488 Set_Parent
(CW
, Parent
(T
));
5490 -- Set remaining fields of classwide type
5492 Set_Ekind
(CW
, E_Class_Wide_Type
);
5494 Set_Scope
(CW
, Scop
);
5495 Set_Is_Tagged_Type
(CW
);
5496 Set_Is_First_Subtype
(CW
, True);
5497 Init_Size_Align
(CW
);
5498 Set_Has_Unknown_Discriminants
(CW
, True);
5499 Set_Class_Wide_Type
(CW
, CW
);
5500 Set_Equivalent_Type
(CW
, Empty
);
5501 Set_From_With_Type
(CW
, From_With_Type
(T
));
5503 -- Link type to its class-wide type
5505 Set_Class_Wide_Type
(T
, CW
);
5507 end Decorate_Tagged_Type
;
5509 ------------------------------------
5510 -- Decorate_Package_Specification --
5511 ------------------------------------
5513 procedure Decorate_Package_Specification
(P
: Entity_Id
) is
5515 -- Place only the most basic attributes
5517 Set_Ekind
(P
, E_Package
);
5518 Set_Etype
(P
, Standard_Void_Type
);
5519 end Decorate_Package_Specification
;
5521 --------------------------------
5522 -- New_Internal_Shadow_Entity --
5523 --------------------------------
5525 function New_Internal_Shadow_Entity
5526 (Kind
: Entity_Kind
;
5527 Sloc_Value
: Source_Ptr
;
5528 Id_Char
: Character) return Entity_Id
5530 E
: constant Entity_Id
:= Make_Temporary
(Sloc_Value
, Id_Char
);
5533 Set_Ekind
(E
, Kind
);
5534 Set_Is_Internal
(E
, True);
5536 if Kind
in Type_Kind
then
5537 Init_Size_Align
(E
);
5540 Append_Entity
(E
, Lim_Header
);
5543 end New_Internal_Shadow_Entity
;
5545 -- Start of processing for Build_Limited_Views
5548 pragma Assert
(Limited_Present
(N
));
5550 -- A library_item mentioned in a limited_with_clause is a package
5551 -- declaration, not a subprogram declaration, generic declaration,
5552 -- generic instantiation, or package renaming declaration.
5554 case Nkind
(Unit
(Library_Unit
(N
))) is
5555 when N_Package_Declaration
=>
5558 when N_Subprogram_Declaration
=>
5559 Error_Msg_N
("subprograms not allowed in "
5560 & "limited with_clauses", N
);
5563 when N_Generic_Package_Declaration |
5564 N_Generic_Subprogram_Declaration
=>
5565 Error_Msg_N
("generics not allowed in "
5566 & "limited with_clauses", N
);
5569 when N_Generic_Instantiation
=>
5570 Error_Msg_N
("generic instantiations not allowed in "
5571 & "limited with_clauses", N
);
5574 when N_Generic_Renaming_Declaration
=>
5575 Error_Msg_N
("generic renamings not allowed in "
5576 & "limited with_clauses", N
);
5579 when N_Subprogram_Renaming_Declaration
=>
5580 Error_Msg_N
("renamed subprograms not allowed in "
5581 & "limited with_clauses", N
);
5584 when N_Package_Renaming_Declaration
=>
5585 Error_Msg_N
("renamed packages not allowed in "
5586 & "limited with_clauses", N
);
5590 raise Program_Error
;
5593 -- Check if the chain is already built
5595 Spec
:= Specification
(Unit
(Library_Unit
(N
)));
5597 if Limited_View_Installed
(Spec
) then
5601 Set_Ekind
(P
, E_Package
);
5603 -- Build the header of the limited_view
5605 Lim_Header
:= Make_Temporary
(Sloc
(N
), 'Z');
5606 Set_Ekind
(Lim_Header
, E_Package
);
5607 Set_Is_Internal
(Lim_Header
);
5608 Set_Limited_View
(P
, Lim_Header
);
5610 -- Create the auxiliary chain. All the shadow entities are appended to
5611 -- the list of entities of the limited-view header
5615 First_Decl
=> First
(Visible_Declarations
(Spec
)));
5617 -- Save the last built shadow entity. It is needed later to set the
5618 -- reference to the first shadow entity in the private part
5620 Last_Pub_Lim_E
:= Last_Lim_E
;
5622 -- Ada 2005 (AI-262): Add the limited view of the private declarations
5623 -- Required to give support to limited-private-with clauses
5625 Build_Chain
(Scope
=> P
,
5626 First_Decl
=> First
(Private_Declarations
(Spec
)));
5628 if Last_Pub_Lim_E
/= Empty
then
5629 Set_First_Private_Entity
5630 (Lim_Header
, Next_Entity
(Last_Pub_Lim_E
));
5632 Set_First_Private_Entity
5633 (Lim_Header
, First_Entity
(P
));
5636 Set_Limited_View_Installed
(Spec
);
5637 end Build_Limited_Views
;
5639 -------------------------------
5640 -- Check_Body_Needed_For_SAL --
5641 -------------------------------
5643 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
) is
5645 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean;
5646 -- Determine whether use of entity E might require the presence of its
5647 -- body. For a package this requires a recursive traversal of all nested
5650 ---------------------------
5651 -- Entity_Needed_For_SAL --
5652 ---------------------------
5654 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean is
5658 if Is_Subprogram
(E
)
5659 and then Has_Pragma_Inline
(E
)
5663 elsif Ekind_In
(E
, E_Generic_Function
, E_Generic_Procedure
) then
5666 elsif Ekind
(E
) = E_Generic_Package
5668 Nkind
(Unit_Declaration_Node
(E
)) = N_Generic_Package_Declaration
5669 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
5673 elsif Ekind
(E
) = E_Package
5674 and then Nkind
(Unit_Declaration_Node
(E
)) = N_Package_Declaration
5675 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
5677 Ent
:= First_Entity
(E
);
5678 while Present
(Ent
) loop
5679 if Entity_Needs_Body
(Ent
) then
5691 end Entity_Needs_Body
;
5693 -- Start of processing for Check_Body_Needed_For_SAL
5696 if Ekind
(Unit_Name
) = E_Generic_Package
5697 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
5698 N_Generic_Package_Declaration
5700 Present
(Corresponding_Body
(Unit_Declaration_Node
(Unit_Name
)))
5702 Set_Body_Needed_For_SAL
(Unit_Name
);
5704 elsif Ekind_In
(Unit_Name
, E_Generic_Procedure
, E_Generic_Function
) then
5705 Set_Body_Needed_For_SAL
(Unit_Name
);
5707 elsif Is_Subprogram
(Unit_Name
)
5708 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
5709 N_Subprogram_Declaration
5710 and then Has_Pragma_Inline
(Unit_Name
)
5712 Set_Body_Needed_For_SAL
(Unit_Name
);
5714 elsif Ekind
(Unit_Name
) = E_Subprogram_Body
then
5715 Check_Body_Needed_For_SAL
5716 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
5718 elsif Ekind
(Unit_Name
) = E_Package
5719 and then Entity_Needs_Body
(Unit_Name
)
5721 Set_Body_Needed_For_SAL
(Unit_Name
);
5723 elsif Ekind
(Unit_Name
) = E_Package_Body
5724 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) = N_Package_Body
5726 Check_Body_Needed_For_SAL
5727 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
5729 end Check_Body_Needed_For_SAL
;
5731 --------------------
5732 -- Remove_Context --
5733 --------------------
5735 procedure Remove_Context
(N
: Node_Id
) is
5736 Lib_Unit
: constant Node_Id
:= Unit
(N
);
5739 -- If this is a child unit, first remove the parent units
5741 if Is_Child_Spec
(Lib_Unit
) then
5742 Remove_Parents
(Lib_Unit
);
5745 Remove_Context_Clauses
(N
);
5748 ----------------------------
5749 -- Remove_Context_Clauses --
5750 ----------------------------
5752 procedure Remove_Context_Clauses
(N
: Node_Id
) is
5754 Unit_Name
: Entity_Id
;
5757 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
5758 -- limited-views first and regular-views later (to maintain the
5761 -- First Phase: Remove limited_with context clauses
5763 Item
:= First
(Context_Items
(N
));
5764 while Present
(Item
) loop
5766 -- We are interested only in with clauses which got installed
5769 if Nkind
(Item
) = N_With_Clause
5770 and then Limited_Present
(Item
)
5771 and then Limited_View_Installed
(Item
)
5773 Remove_Limited_With_Clause
(Item
);
5779 -- Second Phase: Loop through context items and undo regular
5780 -- with_clauses and use_clauses.
5782 Item
:= First
(Context_Items
(N
));
5783 while Present
(Item
) loop
5785 -- We are interested only in with clauses which got installed on
5786 -- entry, as indicated by their Context_Installed flag set
5788 if Nkind
(Item
) = N_With_Clause
5789 and then Limited_Present
(Item
)
5790 and then Limited_View_Installed
(Item
)
5794 elsif Nkind
(Item
) = N_With_Clause
5795 and then Context_Installed
(Item
)
5797 -- Remove items from one with'ed unit
5799 Unit_Name
:= Entity
(Name
(Item
));
5800 Remove_Unit_From_Visibility
(Unit_Name
);
5801 Set_Context_Installed
(Item
, False);
5803 elsif Nkind
(Item
) = N_Use_Package_Clause
then
5804 End_Use_Package
(Item
);
5806 elsif Nkind
(Item
) = N_Use_Type_Clause
then
5807 End_Use_Type
(Item
);
5812 end Remove_Context_Clauses
;
5814 --------------------------------
5815 -- Remove_Limited_With_Clause --
5816 --------------------------------
5818 procedure Remove_Limited_With_Clause
(N
: Node_Id
) is
5819 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
5822 Lim_Header
: Entity_Id
;
5823 Lim_Typ
: Entity_Id
;
5827 pragma Assert
(Limited_View_Installed
(N
));
5829 -- In case of limited with_clause on subprograms, generics, instances,
5830 -- or renamings, the corresponding error was previously posted and we
5831 -- have nothing to do here.
5833 if Nkind
(P_Unit
) /= N_Package_Declaration
then
5837 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
5839 -- Handle child packages
5841 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
5842 P
:= Defining_Identifier
(P
);
5845 if Debug_Flag_I
then
5846 Write_Str
("remove limited view of ");
5847 Write_Name
(Chars
(P
));
5848 Write_Str
(" from visibility");
5852 -- Prepare the removal of the shadow entities from visibility. The first
5853 -- element of the limited view is a header (an E_Package entity) that is
5854 -- used to reference the first shadow entity in the private part of the
5857 Lim_Header
:= Limited_View
(P
);
5858 Lim_Typ
:= First_Entity
(Lim_Header
);
5860 -- Remove package and shadow entities from visibility if it has not
5863 if not Analyzed
(P_Unit
) then
5865 Set_Is_Immediately_Visible
(P
, False);
5867 while Present
(Lim_Typ
) loop
5869 Next_Entity
(Lim_Typ
);
5872 -- Otherwise this package has already appeared in the closure and its
5873 -- shadow entities must be replaced by its real entities. This code
5874 -- must be kept synchronized with the complementary code in Install
5875 -- Limited_Withed_Unit.
5878 -- Real entities that are type or subtype declarations were hidden
5879 -- from visibility at the point of installation of the limited-view.
5880 -- Now we recover the previous value of the hidden attribute.
5882 E
:= First_Entity
(P
);
5883 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
5885 Set_Is_Hidden
(E
, Was_Hidden
(E
));
5891 while Present
(Lim_Typ
)
5892 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
5894 -- Nested packages and child units were not unchained
5896 if Ekind
(Lim_Typ
) /= E_Package
5897 and then not Is_Child_Unit
(Non_Limited_View
(Lim_Typ
))
5899 -- If the package has incomplete types, the limited view of the
5900 -- incomplete type is in fact never visible (AI05-129) but we
5901 -- have created a shadow entity E1 for it, that points to E2,
5902 -- a non-limited incomplete type. This in turn has a full view
5903 -- E3 that is the full declaration. There is a corresponding
5904 -- shadow entity E4. When reinstalling the non-limited view,
5905 -- E2 must become the current entity and E3 must be ignored.
5907 E
:= Non_Limited_View
(Lim_Typ
);
5909 if Present
(Current_Entity
(E
))
5910 and then Ekind
(Current_Entity
(E
)) = E_Incomplete_Type
5911 and then Full_View
(Current_Entity
(E
)) = E
5914 -- Lim_Typ is the limited view of a full type declaration
5915 -- that has a previous incomplete declaration, i.e. E3 from
5916 -- the previous description. Nothing to insert.
5921 pragma Assert
(not In_Chain
(E
));
5923 Prev
:= Current_Entity
(Lim_Typ
);
5925 if Prev
= Lim_Typ
then
5926 Set_Current_Entity
(E
);
5929 while Present
(Prev
)
5930 and then Homonym
(Prev
) /= Lim_Typ
5932 Prev
:= Homonym
(Prev
);
5935 if Present
(Prev
) then
5936 Set_Homonym
(Prev
, E
);
5940 -- Preserve structure of homonym chain
5942 Set_Homonym
(E
, Homonym
(Lim_Typ
));
5946 Next_Entity
(Lim_Typ
);
5950 -- Indicate that the limited view of the package is not installed
5952 Set_From_With_Type
(P
, False);
5953 Set_Limited_View_Installed
(N
, False);
5954 end Remove_Limited_With_Clause
;
5956 --------------------
5957 -- Remove_Parents --
5958 --------------------
5960 procedure Remove_Parents
(Lib_Unit
: Node_Id
) is
5963 P_Spec
: Node_Id
:= Empty
;
5965 Vis
: constant Boolean :=
5966 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
;
5969 if Is_Child_Spec
(Lib_Unit
) then
5970 P_Spec
:= Parent_Spec
(Lib_Unit
);
5972 elsif Nkind
(Lib_Unit
) = N_Package_Body
5973 and then Nkind
(Original_Node
(Lib_Unit
)) = N_Package_Instantiation
5975 P_Spec
:= Parent_Spec
(Original_Node
(Lib_Unit
));
5978 if Present
(P_Spec
) then
5980 P_Name
:= Get_Parent_Entity
(P
);
5981 Remove_Context_Clauses
(P_Spec
);
5982 End_Package_Scope
(P_Name
);
5983 Set_Is_Immediately_Visible
(P_Name
, Vis
);
5985 -- Remove from visibility the siblings as well, which are directly
5986 -- visible while the parent is in scope.
5988 E
:= First_Entity
(P_Name
);
5989 while Present
(E
) loop
5990 if Is_Child_Unit
(E
) then
5991 Set_Is_Immediately_Visible
(E
, False);
5997 Set_In_Package_Body
(P_Name
, False);
5999 -- This is the recursive call to remove the context of any higher
6000 -- level parent. This recursion ensures that all parents are removed
6001 -- in the reverse order of their installation.
6007 ---------------------------------
6008 -- Remove_Private_With_Clauses --
6009 ---------------------------------
6011 procedure Remove_Private_With_Clauses
(Comp_Unit
: Node_Id
) is
6014 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean;
6015 -- Check whether a given unit appears in a regular with_clause. Used to
6016 -- determine whether a private_with_clause, implicit or explicit, should
6019 ----------------------------
6020 -- In_Regular_With_Clause --
6021 ----------------------------
6023 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean
6028 Item
:= First
(Context_Items
(Comp_Unit
));
6029 while Present
(Item
) loop
6030 if Nkind
(Item
) = N_With_Clause
6031 and then Entity
(Name
(Item
)) = E
6032 and then not Private_Present
(Item
)
6040 end In_Regular_With_Clause
;
6042 -- Start of processing for Remove_Private_With_Clauses
6045 Item
:= First
(Context_Items
(Comp_Unit
));
6046 while Present
(Item
) loop
6047 if Nkind
(Item
) = N_With_Clause
6048 and then Private_Present
(Item
)
6050 -- If private_with_clause is redundant, remove it from context,
6051 -- as a small optimization to subsequent handling of private_with
6052 -- clauses in other nested packages.
6054 if In_Regular_With_Clause
(Entity
(Name
(Item
))) then
6056 Nxt
: constant Node_Id
:= Next
(Item
);
6062 elsif Limited_Present
(Item
) then
6063 if not Limited_View_Installed
(Item
) then
6064 Remove_Limited_With_Clause
(Item
);
6070 Remove_Unit_From_Visibility
(Entity
(Name
(Item
)));
6071 Set_Context_Installed
(Item
, False);
6079 end Remove_Private_With_Clauses
;
6081 ---------------------------------
6082 -- Remove_Unit_From_Visibility --
6083 ---------------------------------
6085 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
) is
6086 P
: constant Entity_Id
:= Scope
(Unit_Name
);
6089 if Debug_Flag_I
then
6090 Write_Str
("remove unit ");
6091 Write_Name
(Chars
(Unit_Name
));
6092 Write_Str
(" from visibility");
6096 if P
/= Standard_Standard
then
6097 Set_Is_Visible_Child_Unit
(Unit_Name
, False);
6100 Set_Is_Potentially_Use_Visible
(Unit_Name
, False);
6101 Set_Is_Immediately_Visible
(Unit_Name
, False);
6102 end Remove_Unit_From_Visibility
;
6117 procedure Unchain
(E
: Entity_Id
) is
6121 Prev
:= Current_Entity
(E
);
6127 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
6130 while Present
(Prev
)
6131 and then Homonym
(Prev
) /= E
6133 Prev
:= Homonym
(Prev
);
6136 if Present
(Prev
) then
6137 Set_Homonym
(Prev
, Homonym
(E
));
6141 if Debug_Flag_I
then
6142 Write_Str
(" (homonym) unchain ");
6143 Write_Name
(Chars
(E
));